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Bisht K, Verma VK, Abdullah Z, Prajapati V, Rajiv N, Bhatia J, Ray R, Nag TC, Arya DS. Arglabin: A mediator of inflammasome modulated and independent myocardial injury (PARA-AMI study). Eur J Pharmacol 2024; 970:176465. [PMID: 38479722 DOI: 10.1016/j.ejphar.2024.176465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 02/01/2024] [Accepted: 02/28/2024] [Indexed: 03/19/2024]
Abstract
BACKGROUND Arglabin is a plant alkaloid (sesquiterpene lactone) that is used as an anticancer drug. It has potential anti-diabetic and anti-atherogenic effects. PURPOSE Arglabin has drawn particular attention because of its therapeutic effects as an anti-inflammatory agent in multiple diseases. Since arglabin inhibits Epidermal Growth Factor Receptor (EGFR) tyrosine kinase, concerns for cardiotoxic effects are valid. The present study was designed to investigate the protective effects of arglabin on the myocardium. STUDY DESIGN This study was designed to evaluate the effect of arglabin on the myocardium in an experimental model of myocardial necrosis in rats. Different doses of arglabin (2.5, 5, and 10 μg/kg) were investigated as pre-treatment for 21 days in the isoproterenol (ISO) model of myocardial necrosis groups and per se groups. METHODS On the 22nd day, hemodynamic, histopathological, electron microscopy, oxidative stress markers, inflammatory mediators, apoptotic markers, inflammasome mediators, and Western blot analysis were performed to evaluate the effects of arglabin. RESULTS Arglabin pre-treatment showed improvement in hemodynamic parameters and histopathological findings at low doses in isoproterenol-induced myocardial necrosis model of rats. Arglabin administration altered myocardial structure and modulated myocardial function via activation of NFκB/MAPK pathway that led to myocardial injury with an increase in dose. CONCLUSION Arglabin imparted partial cardio-protection via an inflammasome-dependent pathway and mediated injury through the inflammasome-independent pathway.
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Affiliation(s)
- Khushboo Bisht
- Department of Pharmacology, All India Institute of Medical Sciences, New Delhi, India
| | - Vipin Kumar Verma
- Department of Pharmacology, All India Institute of Medical Sciences, New Delhi, India
| | - Zia Abdullah
- Department of Cardiology, All India Institute of Medical Sciences, New Delhi, India
| | - Vaishali Prajapati
- Department of Pharmacology, All India Institute of Medical Sciences, New Delhi, India
| | - Narang Rajiv
- Department of Cardiology, All India Institute of Medical Sciences, New Delhi, India
| | - Jagriti Bhatia
- Department of Pharmacology, All India Institute of Medical Sciences, New Delhi, India
| | - Ruma Ray
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Tapas Chandra Nag
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India
| | - Dharamvir Singh Arya
- Department of Pharmacology, All India Institute of Medical Sciences, New Delhi, India.
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Wang S, Wang X, Ling L, Li C, Ren Z. RICH1 is a novel key suppressor of isoproterenol‑ or angiotensin II‑induced cardiomyocyte hypertrophy. Mol Med Rep 2024; 29:69. [PMID: 38456539 PMCID: PMC10955514 DOI: 10.3892/mmr.2024.13193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 01/31/2024] [Indexed: 03/09/2024] Open
Abstract
Cardiac hypertrophy is one of the key processes in the development of heart failure. Notably, small GTPases and GTPase‑activating proteins (GAPs) serve essential roles in cardiac hypertrophy. RhoGAP interacting with CIP4 homologs protein 1 (RICH1) is a RhoGAP that can regulate Cdc42/Rac1 and F‑actin dynamics. RICH1 is involved in cell proliferation and adhesion; however, to the best of our knowledge, its role in cardiac hypertrophy remains unknown. In the present study, the role of RICH1 in cardiomyocyte hypertrophy was assessed. Cell viability was analyzed using the Cell Counting Kit‑8 assay and cells surface area (CSA) was determined by cell fluorescence staining. Reverse transcription‑quantitative PCR and western blotting were used to assess the mRNA expression levels of hypertrophic marker genes, such as Nppa, Nppb and Myh7, and the protein expression levels of RICH1, respectively. RICH1 was shown to be downregulated in isoproterenol (ISO)‑ or angiotensin II (Ang II)‑treated H9c2 cells. Notably, overexpression of RICH1 attenuated the upregulation of hypertrophy‑related markers, such as Nppa, Nppb and Myh7, and the enlargement of CSA induced by ISO and Ang II. By contrast, the knockdown of RICH1 exacerbated these effects. These findings suggested that RICH1 may be a novel suppressor of ISO‑ or Ang II‑induced cardiomyocyte hypertrophy. The results of the present study will be beneficial to further studies assessing the role of RICH1 and its downstream molecules in inhibiting cardiac hypertrophy.
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Affiliation(s)
- Siqi Wang
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei 437100, P.R. China
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei 437100, P.R. China
| | - Xin Wang
- School of Mathematics and Statistics, Hubei University of Science and Technology, Xianning, Hubei 437100, P.R. China
| | - Li Ling
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei 437100, P.R. China
| | - Cairong Li
- School of Clinical Medicine, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei 437100, P.R. China
| | - Zhanhong Ren
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei 437100, P.R. China
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De Bartolo A, Pasqua T, Romeo N, Rago V, Perrotta I, Giordano F, Granieri MC, Marrone A, Mazza R, Cerra MC, Lefranc B, Leprince J, Anouar Y, Angelone T, Rocca C. The redox-active defensive Selenoprotein T as a novel stress sensor protein playing a key role in the pathophysiology of heart failure. J Transl Med 2024; 22:375. [PMID: 38643121 PMCID: PMC11032602 DOI: 10.1186/s12967-024-05192-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Accepted: 04/12/2024] [Indexed: 04/22/2024] Open
Abstract
Maladaptive cardiac hypertrophy contributes to the development of heart failure (HF). The oxidoreductase Selenoprotein T (SELENOT) emerged as a key regulator during rat cardiogenesis and acute cardiac protection. However, its action in chronic settings of cardiac dysfunction is not understood. Here, we investigated the role of SELENOT in the pathophysiology of HF: (i) by designing a small peptide (PSELT), recapitulating SELENOT activity via the redox site, and assessed its beneficial action in a preclinical model of HF [aged spontaneously hypertensive heart failure (SHHF) rats] and against isoproterenol (ISO)-induced hypertrophy in rat ventricular H9c2 and adult human AC16 cardiomyocytes; (ii) by evaluating the SELENOT intra-cardiomyocyte production and secretion under hypertrophied stimulation. Results showed that PSELT attenuated systemic inflammation, lipopolysaccharide (LPS)-induced macrophage M1 polarization, myocardial injury, and the severe ultrastructural alterations, while counteracting key mediators of cardiac fibrosis, aging, and DNA damage and restoring desmin downregulation and SELENOT upregulation in the failing hearts. In the hemodynamic assessment, PSELT improved the contractile impairment at baseline and following ischemia/reperfusion injury, and reduced infarct size in normal and failing hearts. At cellular level, PSELT counteracted ISO-mediated hypertrophy and ultrastructural alterations through its redox motif, while mitigating ISO-triggered SELENOT intracellular production and secretion, a phenomenon that presumably reflects the extent of cell damage. Altogether, these results indicate that SELENOT could represent a novel sensor of hypertrophied cardiomyocytes and a potential PSELT-based new therapeutic approach in myocardial hypertrophy and HF.
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Affiliation(s)
- Anna De Bartolo
- Cellular and Molecular Cardiovascular Pathophysiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
| | - Teresa Pasqua
- Department of Health Science, University Magna Graecia of Catanzaro, 88100, Catanzaro, Italy
| | - Naomi Romeo
- Cellular and Molecular Cardiovascular Pathophysiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
| | - Vittoria Rago
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036, Rende, Italy
| | - Ida Perrotta
- Centre for Microscopy and Microanalysis (CM2), Department of Biology, E. and E. S. (DiBEST), University of Calabria, 87036, Rende, Italy
| | - Francesca Giordano
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036, Rende, Italy
| | - Maria Concetta Granieri
- Cellular and Molecular Cardiovascular Pathophysiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
| | - Alessandro Marrone
- Cellular and Molecular Cardiovascular Pathophysiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
| | - Rosa Mazza
- Organ and System Physiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
| | - Maria Carmela Cerra
- Organ and System Physiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
| | - Benjamin Lefranc
- UNIROUEN, Inserm U1239, Neuroendocrine, Endocrine and Germinal Differentiation and Communication (NorDiC), Rouen Normandie University, 76000, Mont-Saint-Aignan, France
- UNIROUEN, UMS-UAR HERACLES, PRIMACEN, Cell Imaging Platform of Normandy, Institute for Research and Innovation in Biomedicine (IRIB), 76183, Rouen, France
| | - Jérôme Leprince
- UNIROUEN, Inserm U1239, Neuroendocrine, Endocrine and Germinal Differentiation and Communication (NorDiC), Rouen Normandie University, 76000, Mont-Saint-Aignan, France
- UNIROUEN, UMS-UAR HERACLES, PRIMACEN, Cell Imaging Platform of Normandy, Institute for Research and Innovation in Biomedicine (IRIB), 76183, Rouen, France
| | - Youssef Anouar
- UNIROUEN, Inserm U1239, Neuroendocrine, Endocrine and Germinal Differentiation and Communication (NorDiC), Rouen Normandie University, 76000, Mont-Saint-Aignan, France
| | - Tommaso Angelone
- Cellular and Molecular Cardiovascular Pathophysiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy.
- National Institute of Cardiovascular Research (INRC), 40126, Bologna, Italy.
| | - Carmine Rocca
- Cellular and Molecular Cardiovascular Pathophysiology Laboratory, Department of Biology, E. and E. S. (DiBEST), University of Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
- National Institute of Cardiovascular Research (INRC), 40126, Bologna, Italy
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Qasim H, Rajaei M, Xu Y, Reyes-Alcaraz A, Abdelnasser HY, Stewart MD, Lahiri SK, Wehrens XHT, McConnell BK. AKAP12 Upregulation Associates With PDE8A to Accelerate Cardiac Dysfunction. Circ Res 2024; 134:1006-1022. [PMID: 38506047 DOI: 10.1161/circresaha.123.323655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 03/07/2024] [Indexed: 03/21/2024]
Abstract
BACKGROUND In heart failure, signaling downstream the β2-adrenergic receptor is critical. Sympathetic stimulation of β2-adrenergic receptor alters cAMP (cyclic adenosine 3',5'-monophosphate) and triggers PKA (protein kinase A)-dependent phosphorylation of proteins that regulate cardiac function. cAMP levels are regulated in part by PDEs (phosphodiesterases). Several AKAPs (A kinase anchoring proteins) regulate cardiac function and are proposed as targets for precise pharmacology. AKAP12 is expressed in the heart and has been reported to directly bind β2-adrenergic receptor, PKA, and PDE4D. However, its roles in cardiac function are unclear. METHODS cAMP accumulation in real time downstream of the β2-adrenergic receptor was detected for 60 minutes in live cells using the luciferase-based biosensor (GloSensor) in AC16 human-derived cardiomyocyte cell lines overexpressing AKAP12 versus controls. Cardiomyocyte intracellular calcium and contractility were studied in adult primary cardiomyocytes from male and female mice overexpressing cardiac AKAP12 (AKAP12OX) and wild-type littermates post acute treatment with 100-nM isoproterenol (ISO). Systolic cardiac function was assessed in mice after 14 days of subcutaneous ISO administration (60 mg/kg per day). AKAP12 gene and protein expression levels were evaluated in left ventricular samples from patients with end-stage heart failure. RESULTS AKAP12 upregulation significantly reduced total intracellular cAMP levels in AC16 cells through PDE8. Adult primary cardiomyocytes from AKAP12OX mice had significantly reduced contractility and impaired calcium handling in response to ISO, which was reversed in the presence of the selective PDE8 inhibitor (PF-04957325). AKAP12OX mice had deteriorated systolic cardiac function and enlarged left ventricles. Patients with end-stage heart failure had upregulated gene and protein levels of AKAP12. CONCLUSIONS AKAP12 upregulation in cardiac tissue is associated with accelerated cardiac dysfunction through the AKAP12-PDE8 axis.
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Affiliation(s)
- Hanan Qasim
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy (H.Q., M.R., Y.X., A.R.-A., H.Y.A., B.K.M.), University of Houston, TX
| | - Mehrdad Rajaei
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy (H.Q., M.R., Y.X., A.R.-A., H.Y.A., B.K.M.), University of Houston, TX
| | - Ying Xu
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy (H.Q., M.R., Y.X., A.R.-A., H.Y.A., B.K.M.), University of Houston, TX
| | - Arfaxad Reyes-Alcaraz
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy (H.Q., M.R., Y.X., A.R.-A., H.Y.A., B.K.M.), University of Houston, TX
| | - Hala Y Abdelnasser
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy (H.Q., M.R., Y.X., A.R.-A., H.Y.A., B.K.M.), University of Houston, TX
| | - M David Stewart
- Department of Biology and Biochemistry (M.D.S.), University of Houston, TX
| | - Satadru K Lahiri
- Cardiovascular Research Institute, Departments of Integrative Physiology, Medicine, Neuroscience, Pediatrics, and Center for Space Medicine, Baylor College of Medicine, Houston, TX (S.K.L., X.H.T.W.)
| | - Xander H T Wehrens
- Cardiovascular Research Institute, Departments of Integrative Physiology, Medicine, Neuroscience, Pediatrics, and Center for Space Medicine, Baylor College of Medicine, Houston, TX (S.K.L., X.H.T.W.)
| | - Bradley K McConnell
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy (H.Q., M.R., Y.X., A.R.-A., H.Y.A., B.K.M.), University of Houston, TX
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5
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Seguret M, Davidson P, Robben S, Jouve C, Pereira C, Lelong Q, Deshayes L, Cerveau C, Le Berre M, Rodrigues Ribeiro RS, Hulot JS. A versatile high-throughput assay based on 3D ring-shaped cardiac tissues generated from human induced pluripotent stem cell-derived cardiomyocytes. eLife 2024; 12:RP87739. [PMID: 38578976 PMCID: PMC11001295 DOI: 10.7554/elife.87739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2024] Open
Abstract
We developed a 96-well plate assay which allows fast, reproducible, and high-throughput generation of 3D cardiac rings around a deformable optically transparent hydrogel (polyethylene glycol [PEG]) pillar of known stiffness. Human induced pluripotent stem cell-derived cardiomyocytes, mixed with normal human adult dermal fibroblasts in an optimized 3:1 ratio, self-organized to form ring-shaped cardiac constructs. Immunostaining showed that the fibroblasts form a basal layer in contact with the glass, stabilizing the muscular fiber above. Tissues started contracting around the pillar at D1 and their fractional shortening increased until D7, reaching a plateau at 25±1%, that was maintained up to 14 days. The average stress, calculated from the compaction of the central pillar during contractions, was 1.4±0.4 mN/mm2. The cardiac constructs recapitulated expected inotropic responses to calcium and various drugs (isoproterenol, verapamil) as well as the arrhythmogenic effects of dofetilide. This versatile high-throughput assay allows multiple in situ mechanical and structural readouts.
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Lu YY, Cheng CC, Chen YC, Lin YK, Higa S, Kao YH, Chen YJ. Adenosine monophosphate-regulated protein kinase inhibition modulates electrophysiological characteristics and calcium homeostasis of rabbit right ventricular outflow tract. Fundam Clin Pharmacol 2024; 38:262-275. [PMID: 37664898 DOI: 10.1111/fcp.12953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 07/23/2023] [Accepted: 08/20/2023] [Indexed: 09/05/2023]
Abstract
BACKGROUND Metabolic stress predisposes to ventricular arrhythmias and sudden cardiac death. Right ventricular outflow tract (RVOT) is the common origin of ventricular arrhythmias. Adenosine monophosphate-regulated protein kinase (AMPK) activation is an important compensatory mechanism for cardiac remodeling during metabolic stress. OBJECTIVES The purpose of this study was to access whether AMPK inhibition would modulate RVOT electrophysiology, calcium (Ca2+ ) regulation, and RVOT arrhythmogenesis or not. METHODS Conventional microelectrodes were used to record electrical activity before and after compound C (10 µM, an AMPK inhibitor) in isoproterenol (1 µM)-treated rabbit RVOT tissue preparations under electrical pacing. Whole-cell patch-clamp and confocal microscopic examinations were performed in baseline and compound C-treated rabbit RVOT cardiomyocytes to investigate ionic currents and intracellular Ca2+ transients in isolated rabbit RVOT cardiomyocytes. RESULTS Compound C decreased RVOT contractility, and reversed isoproterenol increased RVOT contractility. Compound C decreased the incidence, rate, and duration of isoproterenol-induced RVOT burst firing under rapid pacing. Compared to baseline, compound C-treated RVOT cardiomyocytes had a longer action potential duration, smaller intracellular Ca2+ transients, late sodium (Na+ ), peak L-type Ca2+ current density, Na+ -Ca2+ exchanger, transient outward potassium (K+ ) current, and rapid and slow delayed rectifier K+ currents. CONCLUSION AMPK inhibition modulates RVOT electrophysiological characteristics and Ca2+ homeostasis, contributing to lower RVOT arrhythmogenic activity. Accordingly, AMPK inhibition might potentially reduce ventricular tachyarrhythmias.
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Affiliation(s)
- Yen-Yu Lu
- Division of Cardiology, Department of Internal Medicine, Sijhih Cathay General Hospital, New Taipei City, Taiwan
- School of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan
| | - Chen-Chuan Cheng
- Department of Cardiology, Chi-Mei Medical Center, Tainan, Taiwan
| | - Yao-Chang Chen
- Department of Biomedical Engineering, and Institute of Physiology, National Defense Medical Center, Taipei, Taiwan
| | - Yung-Kuo Lin
- Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
- Division of Cardiology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
- Taipei Heart Institute, Taipei Medical University, Taipei, Taiwan
| | - Satoshi Higa
- Cardiac Electrophysiology and Pacing Laboratory, Division of Cardiovascular Medicine, Makiminato Central Hospital, Okinawa, Japan
| | - Yu-Hsun Kao
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
- Department of Medical Education and Research, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Yi-Jen Chen
- Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
- Cardiovascular Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
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Wang H, Siren J, Perttunen S, Immonen K, Chen Y, Narumanchi S, Kosonen R, Paavola J, Laine M, Tikkanen I, Lakkisto P. Deficiency of heme oxygenase 1a causes detrimental effects on cardiac function. J Cell Mol Med 2024; 28:e18243. [PMID: 38509740 PMCID: PMC10955162 DOI: 10.1111/jcmm.18243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 02/26/2024] [Accepted: 03/04/2024] [Indexed: 03/22/2024] Open
Abstract
Humans lacking heme oxygenase 1 (HMOX1) display growth retardation, haemolytic anaemia, and vulnerability to stress; however, cardiac function remains unclear. We aimed to explore the cardiac function of zebrafish lacking hmox1a at baseline and in response to stress. We generated zebrafish hmox1a mutants using CRISPR/Cas9 genome editing technology. Deletion of hmox1a increases cardiac output and further induces hypertrophy in adults. Adults lacking hmox1a develop myocardial interstitial fibrosis, restrain cardiomyocyte proliferation and downregulate renal haemoglobin and cardiac antioxidative genes. Larvae lacking hmox1a fail to respond to hypoxia, whereas adults are insensitive to isoproterenol stimulation in the heart, suggesting that hmox1a is necessary for cardiac response to stress. Haplodeficiency of hmox1a stimulates non-mitochondrial respiration and cardiac cell proliferation, increases cardiac output in larvae in response to hypoxia, and deteriorates cardiac function and structure in adults upon isoproterenol treatment. Intriguingly, haplodeficiency of hmox1a upregulates cardiac hmox1a and hmox1b in response to isoproterenol. Collectively, deletion of hmox1a results in cardiac remodelling and abrogates cardiac response to hypoxia and isoproterenol. Haplodeficiency of hmox1a aggravates cardiac response to the stress, which could be associated with the upregulation of hmox1a and hmox1b. Our data suggests that HMOX1 homeostasis is essential for maintaining cardiac function and promoting cardioprotective effects.
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Affiliation(s)
- Hong Wang
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
| | - Juuso Siren
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
| | - Sanni Perttunen
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
| | | | - Yu‐Chia Chen
- Department of AnatomyUniversity of HelsinkiHelsinkiFinland
| | | | - Riikka Kosonen
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
| | - Jere Paavola
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
- Heart and Lung CentreUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
| | - Mika Laine
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
- Heart and Lung CentreUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
| | - Ilkka Tikkanen
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
- Abdominal Centre NephrologyUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
| | - Päivi Lakkisto
- Minerva Foundation Institute for Medical ResearchHelsinkiFinland
- Department of Clinical ChemistryUniversity of Helsinki and Helsinki University HospitalHelsinkiFinland
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Asghari P, Scriven DR, Shahrasebi S, Valdivia HH, Alsina KM, Valdivia CR, Navarro-Garcia JA, Wehrens XH, Moore ED. Phosphorylation of RyR2 simultaneously expands the dyad and rearranges the tetramers. J Gen Physiol 2024; 156:e202213108. [PMID: 38385988 PMCID: PMC10883851 DOI: 10.1085/jgp.202213108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 01/23/2023] [Accepted: 01/31/2024] [Indexed: 02/23/2024] Open
Abstract
We have previously demonstrated that type II ryanodine receptors (RyR2) tetramers can be rapidly rearranged in response to a phosphorylation cocktail. The cocktail modified downstream targets indiscriminately, making it impossible to determine whether phosphorylation of RyR2 was an essential element of the response. Here, we used the β-agonist isoproterenol and mice homozygous for one of the following clinically relevant mutations: S2030A, S2808A, S2814A, or S2814D. We measured the length of the dyad using transmission electron microscopy (TEM) and directly visualized RyR2 distribution using dual-tilt electron tomography. We found that the S2814D mutation, by itself, significantly expanded the dyad and reorganized the tetramers, suggesting a direct link between the phosphorylation state of the tetramer and its microarchitecture. S2808A and S2814A mutant mice, as well as wild types, had significant expansions of their dyads in response to isoproterenol, while S2030A mutants did not. In agreement with functional data from these mutants, S2030 and S2808 were necessary for a complete β-adrenergic response, unlike S2814 mutants. Additionally, all mutants had unique effects on the organization of their tetramer arrays. Lastly, the correlation of structural with functional changes suggests that tetramer-tetramer contacts play an important functional role. We thus conclude that both the size of the dyad and the arrangement of the tetramers are linked to the state of the channel tetramer and can be dynamically altered by a β-adrenergic receptor agonist.
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Affiliation(s)
- Parisa Asghari
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, Canada
| | - David R.L. Scriven
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, Canada
| | - Saba Shahrasebi
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, Canada
| | - Hector H. Valdivia
- Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | | | - Carmen R. Valdivia
- Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - J. Alberto Navarro-Garcia
- Department of Integrative Physiology, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, USA
| | - Xander H.T. Wehrens
- Department of Integrative Physiology, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, USA
| | - Edwin D.W. Moore
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, Canada
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9
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Russell JJ, Mummidi S, DeMarco VG, Grisanti LA, Bailey CA, Bender SB, Chandrasekar B. Integrated miRNA-mRNA networks underlie attenuation of chronic β-adrenergic stimulation-induced cardiac remodeling by minocycline. Physiol Genomics 2024; 56:360-366. [PMID: 38314697 DOI: 10.1152/physiolgenomics.00140.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/18/2024] [Accepted: 02/01/2024] [Indexed: 02/07/2024] Open
Abstract
Adverse cardiac remodeling contributes to heart failure development and progression, partly due to inappropriate sympathetic nervous system activation. Although β-adrenergic receptor (β-AR) blockade is a common heart failure therapy, not all patients respond, prompting exploration of alternative treatments. Minocycline, an FDA-approved antibiotic, has pleiotropic properties beyond antimicrobial action. Recent evidence suggests it may alter gene expression via changes in miRNA expression. Thus, we hypothesized that minocycline could prevent adverse cardiac remodeling induced by the β-AR agonist isoproterenol, involving miRNA-mRNA transcriptome alterations. Male C57BL/6J mice received isoproterenol (30 mg/kg/day sc) or vehicle via osmotic minipump for 21 days, along with daily minocycline (50 mg/kg ip) or sterile saline. Isoproterenol induced cardiac hypertrophy without altering cardiac function, which minocycline prevented. Total mRNA sequencing revealed isoproterenol altering gene networks associated with inflammation and metabolism, with fibrosis activation predicted by integrated miRNA-mRNA sequencing, involving miR-21, miR-30a, miR-34a, miR-92a, and miR-150, among others. Conversely, the cardiac miRNA-mRNA transcriptome predicted fibrosis inhibition in minocycline-treated mice, involving antifibrotic shifts in Atf3 and Itgb6 gene expression associated with miR-194 upregulation. Picrosirius red staining confirmed isoproterenol-induced cardiac fibrosis, prevented by minocycline. These results demonstrate minocycline's therapeutic potential in attenuating adverse cardiac remodeling through miRNA-mRNA-dependent mechanisms, especially in reducing cardiac fibrosis. NEW & NOTEWORTHY We demonstrate that minocycline treatment prevents cardiac hypertrophy and fibrotic remodeling induced by chronic β-adrenergic stimulation by inducing antifibrotic shifts in the cardiac miRNA-mRNA transcriptome.
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Affiliation(s)
- Jacob J Russell
- Biomedical Sciences, University of Missouri, Columbia, Missouri, United States
- Research Service, Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, United States
| | - Srinivas Mummidi
- Health and Behavior Sciences, Texas A&M University-San Antonio, San Antonio, Texas, United States
| | - Vincent G DeMarco
- Research Service, Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, United States
- Medicine, University of Missouri School of Medicine, Columbia, Missouri, United States
| | - Laurel A Grisanti
- Biomedical Sciences, University of Missouri, Columbia, Missouri, United States
| | - Chastidy A Bailey
- Biomedical Sciences, University of Missouri, Columbia, Missouri, United States
- Research Service, Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, United States
| | - Shawn B Bender
- Biomedical Sciences, University of Missouri, Columbia, Missouri, United States
- Research Service, Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, United States
- Dalton Cardiovascular Center, University of Missouri, Columbia, Missouri, United States
| | - Bysani Chandrasekar
- Research Service, Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, United States
- Medicine, University of Missouri School of Medicine, Columbia, Missouri, United States
- Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, United States
- Dalton Cardiovascular Center, University of Missouri, Columbia, Missouri, United States
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10
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Jaiswal S, Anjum MM, Arya DK, Thakur S, Pandey P, Deepak P, Kanaujiya S, Anand S, Kaushik AS, Mishra V, Rajinikanth PS. Surface entrenched β-sitosterol niosomes for enhanced cardioprotective activity against isoproterenol induced cardiotoxicity in rats. Int J Pharm 2024; 653:123872. [PMID: 38336178 DOI: 10.1016/j.ijpharm.2024.123872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/28/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024]
Abstract
Cardiotoxicity (CT) is a severe condition that negatively impacts heart function. β-sitosterol (BS) is a group of phytosterols and known for various pharmacological benefits, such as managing diabetes, cardiac protection, and neuroprotection. This study aims to develop niosomes (NS) containing BS, utilizing cholesterol as the lipid and Tween 80 as the stabilizer. The research focuses on designing and evaluating both conventional BS-NS and hyaluronic acid (HA) modified NS (BS-HA-NS) to enhance the specificity and efficacy of BS within cardiac tissue. The resulting niosomal formulation was spherical, with a size of about 158.51 ± 0.57 nm, an entrapment efficiency of 93.56 ± 1.48 %, and a drug loading of 8.07 ± 1.62 %. To evaluate cytotoxicity on H9c2 heart cells, the MTT assay was used. The cellular uptake of BS-NS and BS-HA-NS was confirmed by confocal microscopy on H9c2 cardiac cells. Administering BS-NS and BS-HA-NS intravenously at a dose of 10 mg/kg showed the ability to significantly decrease the levels of cardiac troponin-I (cTn-I), creatine kinase-MB (CK-MB), lactate dehydrogenase (LDH), aspartate aminotransferase (AST), and lipid peroxidation (MDA). Tissue histopathology indicated a substantial potential for repairing cardiac tissue after treatment with BS-NS and BS-HA-NS and strong cardioprotection against ISO induced myocardial tissue damages. Thus, enhancing BS's therapeutic effectiveness through niosome surface modification holds promise for mitigating cardiac damage resulting from CT.
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Affiliation(s)
- Shweta Jaiswal
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Md Meraj Anjum
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Dilip Kumar Arya
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Sunita Thakur
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Prashant Pandey
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India; Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Payal Deepak
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Shubham Kanaujiya
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Sneha Anand
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Arjun Singh Kaushik
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Vikas Mishra
- Department of Pharmaceutical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India
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11
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Cattani-Cavalieri I, Margolis J, Anicolaesei C, Nuñez FJ, Ostrom RS. Real-Time cAMP Dynamics in Live Cells Using the Fluorescent cAMP Difference Detector In Situ. J Vis Exp 2024. [PMID: 38587373 DOI: 10.3791/66451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024] Open
Abstract
cAMP Difference Detector In Situ (cADDis) is a novel biosensor that allows for the continuous measurement of cAMP levels in living cells. The biosensor is created from a circularly permuted fluorescent protein linked to the hinge region of Epac2. This creates a single fluorophore biosensor that displays either increased or decreased fluorescence upon binding of cAMP. The biosensor exists in red and green upward versions, as well as green downward versions, and several red and green versions targeted to subcellular locations. To illustrate the effectiveness of the biosensor, the green downward version, which decreases in fluorescence upon cAMP binding, was used. Two protocols using this sensor are demonstrated: one utilizing a 96-well plate reading spectrophotometer compatible with high-throughput screening and another utilizing single-cell imaging on a fluorescent microscope. On the plate reader, HEK-293 cells cultured in 96-well plates were stimulated with 10 µM forskolin or 10 nM isoproterenol, which induced rapid and large decreases in fluorescence in the green downward version. The biosensor was used to measure cAMP levels in individual human airway smooth muscle (HASM) cells monitored under a fluorescent microscope. The green downward biosensor displayed similar responses to populations of cells when stimulated with forskolin or isoproterenol. This single-cell assay allows visualization of the biosensor location at 20x and 40x magnification. Thus, this cAMP biosensor is sensitive and flexible, allowing real-time measurement of cAMP in both immortalized and primary cells, and with single cells or populations of cells. These attributes make cADDis a valuable tool for studying cAMP signaling dynamics in living cells.
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Affiliation(s)
| | - Jordyn Margolis
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy
| | - Camelia Anicolaesei
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy
| | - Francisco J Nuñez
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy
| | - Rennolds S Ostrom
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy;
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12
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Lin S, Zhang S, Zhan A, Feng J, Yang Q, Li T, Liu Z, Mo Q, Fan H, Wang K, Wang L. Palmatine alleviates cardiac fibrosis by inhibiting fibroblast activation through the STAT3 pathway. Eur J Pharmacol 2024; 967:176395. [PMID: 38350592 DOI: 10.1016/j.ejphar.2024.176395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 02/04/2024] [Accepted: 02/05/2024] [Indexed: 02/15/2024]
Abstract
Cardiac fibrosis, the hallmark of cardiovascular disease, is characterized by excessive deposition of extracellular matrix in the heart. Emerging evidence indicates that cardiac fibroblasts (CFs) play pivotal roles in driving cardiac fibrosis. However, due to incomplete insights into CFs, there are limited effective approaches to prevent or reverse cardiac fibrosis currently. Palmatine, a protoberberine alkaloid extracted from traditional Chinese botanical remedies, possesses diverse biological effects. This study investigated the potential therapeutic value and mechanism of palmatine against cardiac fibrosis. Adult male C57BL/6 mice were treated with vehicle, isoproterenol (ISO), or ISO plus palmatine for one week. After echocardiography assessment, mice hearts were collected for histopathology, real-time polymerase chain reaction, and Western blot analyses. Primary rat CFs were utilized in vitro. Compared to control, ISO-treated mice exhibited cardiac hypertrophy and structural abnormalities; however, treatment with palmatine ameliorated these effects of ISO. Moreover, palmatine treatment mitigated ISO-induced cardiac fibrosis. Network pharmacology and molecular docking analysis showed that palmatine strongly binds the regulators of cardiac fibrosis including signal transducer and activator of transcription 3 (STAT3) and mammalian target of rapamycin. Furthermore, palmatine reduced the elevated fibrotic factor expressions and overactivated STAT3 induced by ISO, Transformed growth factor β1 (TGF-β1), or interleukin-6 both in vivo and in vitro. Additionally, blocking STAT3 suppressed the TGF-β1-induced CF activation. Collectively, these data demonstrated that palmatine attenuated cardiac fibrosis partly by inhibiting fibroblast activation through the STAT3 pathway. This provides an experimental basis for the clinical treatment of cardiac fibrosis with palmatine.
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Affiliation(s)
- Shaoling Lin
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Shengxi Zhang
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China; Guangdong Hydropower Group Hospital, Guangzhou, 511340, China
| | - Angyu Zhan
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Jiaojiao Feng
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Qianqian Yang
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Tongjun Li
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Zijian Liu
- Department of Emergency, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China; NHC Key Laboratory of Assisted Circulation and Vascular Diseases (Sun Yat-sen University), Guangzhou, 510080, China
| | - Quqian Mo
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Hui Fan
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Keke Wang
- Department of Emergency, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China; NHC Key Laboratory of Assisted Circulation and Vascular Diseases (Sun Yat-sen University), Guangzhou, 510080, China.
| | - Lexun Wang
- Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glycolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Key Unit of Modulating Liver to Treat Hyperlipemia, State Administration of Traditional Chinese Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China.
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13
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Mozzicato AM, Bastrup JA, Sanchez-Alonso JL, van der Horst J, Gorelik J, Hägglund P, Jepps TA. Mesenteric artery smooth muscle cells from hypertensive rats have increased microtubule acetylation. Biochem J 2024; 481:387-403. [PMID: 38373073 DOI: 10.1042/bcj20230420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 02/19/2024] [Accepted: 02/19/2024] [Indexed: 02/21/2024]
Abstract
The dynamic nature of the microtubule network is dependent in part by post-translational modifications (PTMs) - particularly through acetylation, which stabilizes the microtubule network. Whether PTMs of the microtubule network in vascular smooth muscle cells (VSMCs) contribute to the pathophysiology of hypertension is unknown. The aim of this study was to determine the acetylated state of the microtubule network in the mesenteric arteries of spontaneously hypertensive rats (SHR). Experiments were performed on male normotensive rats and SHR mesenteric arteries. Western blotting and mass spectrometry determined changes in tubulin acetylation. Wire myography was used to investigate the effect of tubacin on isoprenaline-mediated vasorelaxations. Isolated cells from normotensive rats were used for scanning ion conductance microscopy (SICM). Mass spectrometry and Western blotting showed that tubulin acetylation is increased in the mesenteric arteries of the SHR compared with normotensive rats. Tubacin enhanced the β-adrenoceptor-mediated vasodilatation by isoprenaline when the endothelium was intact, but attenuated relaxations when the endothelium was denuded or nitric oxide production was inhibited. By pre-treating vessels with colchicine to disrupt the microtubule network, we were able to confirm that the effects of tubacin were microtubule-dependent. Using SICM, we examined the cell surface Young's modulus of VSMCs, but found no difference in control, tubacin-treated, or taxol-treated cells. Acetylation of tubulin at Lys40 is elevated in mesenteric arteries from the SHR. Furthermore, this study shows that tubacin has an endothelial-dependent bimodal effect on isoprenaline-mediated vasorelaxation.
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Affiliation(s)
- Anthony M Mozzicato
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Joakim A Bastrup
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jose L Sanchez-Alonso
- Myocardial Function, National Heart and Lung Institute, Imperial College London, ICTEM, Hammersmith Hospital, London, U.K
| | - Jennifer van der Horst
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Julia Gorelik
- Myocardial Function, National Heart and Lung Institute, Imperial College London, ICTEM, Hammersmith Hospital, London, U.K
| | - Per Hägglund
- Protein Oxidation Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas A Jepps
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
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14
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Xie H, Tian Y, Li Z, Wang K, Li R, Yi S, Chen A, Chen J, Liu J, Wei X, Gao X. Activation of Beta-adrenergic Receptors Upregulates the Signal-to-Noise Ratio of Auditory Input in the Medial Prefrontal Cortex and Mediates Auditory Fear Conditioning. Mol Neurobiol 2024; 61:1833-1844. [PMID: 37787950 DOI: 10.1007/s12035-023-03667-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 09/19/2023] [Indexed: 10/04/2023]
Abstract
Norepinephrine (NE) is involved in auditory fear conditioning (AFC) in posttraumatic stress disorder (PTSD). However, it is still unclear how it acts on neurons. We aimed to investigate whether the activation of the β-adrenergic receptor (β-AR) improves AFC by sensitization of the prelimbic (PL) cortex at the animal, cellular, and molecular levels. In vivo single-cell electrophysiological recording was used to characterize the changes in neurons in the PL cortex after AFC. Then, PL neurons were locally administrated by the β-AR agonist isoproterenol (ISO), the GABAaR agonist muscimol, or intervened by optogenetic method, respectively. Western blotting and immunohistochemistry were finally used to assess molecular changes. Noise and low-frequency tones induced similar AFC. The expression of β-ARs in PL cortex neurons was upregulated after fear conditioning. Microinjection of muscimol into the PL cortex blocked the conformation of AFC, whereas ISO injection facilitated AFC. Moreover, PL neurons can be distinguished into two types, with type I but not type II neurons responding to conditioned sound and being regulated by β-ARs. Our results showed that β-ARs in the PL cortex regulate conditional fear learning by activating type I PL neurons.
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Affiliation(s)
- Haiting Xie
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Yueqin Tian
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Zhongli Li
- Respiratory Medicine, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Kaitao Wang
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Runtong Li
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Shang Yi
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Aimin Chen
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Jian Chen
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Jun Liu
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, No. 250 Changgang road, Guangzhou, Guangdong, 510280, People's Republic of China.
| | - Xuhong Wei
- Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510282, People's Republic of China.
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510282, People's Republic of China.
| | - Xiaoya Gao
- Department of Neurology, Zhujiang Hospital of Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China.
- Department of Pediatric Neurology, Zhujiang Hospital, Southern Medical University, 253 Gongye Avenue, Guangzhou, Guangdong, 510282, People's Republic of China.
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15
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Wang Q, Liang S, Qian J, Xu J, Zheng Q, Wang M, Guo X, Min J, Wu G, Zhuang Z, Luo W, Liang G. OTUD1 promotes isoprenaline- and myocardial infarction-induced heart failure by targeting PDE5A in cardiomyocytes. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167018. [PMID: 38185350 DOI: 10.1016/j.bbadis.2024.167018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 12/29/2023] [Accepted: 01/01/2024] [Indexed: 01/09/2024]
Abstract
Heart failure represents a major cause of death worldwide. Recent research has emphasized the potential role of protein ubiquitination/deubiquitination protein modification in cardiac pathology. Here, we investigate the role of the ovarian tumor deubiquitinase 1 (OTUD1) in isoprenaline (ISO)- and myocardial infarction (MI)-induced heart failure and its molecular mechanism. OTUD1 protein levels were raised markedly in murine cardiomyocytes after MI and ISO treatment. OTUD1 deficiency attenuated myocardial hypertrophy and cardiac dysfunction induced by ISO infusion or MI operation. In vitro, OTUD1 knockdown in neonatal rat ventricular myocytes (NRVMs) attenuated ISO-induced injuries, while OTUD1 overexpression aggravated the pathological changes. Mechanistically, LC-MS/MS and Co-IP studies showed that OTUD1 bound directly to the GAF1 and PDEase domains of PDE5A. OTUD1 was found to reverse K48 ubiquitin chain in PDE5A through cysteine at position 320 of OTUD1, preventing its proteasomal degradation. PDE5A could inactivates the cGMP-PKG-SERCA2a signaling axis which dysregulate the calcium handling in cardiomyocytes, and leading to the cardiomyocyte injuries. In conclusion, OTUD1 promotes heart failure by deubiquitinating and stabilizing PDE5A in cardiomyocytes. These findings have identified PDE5A as a new target of OTUD1 and emphasize the potential of OTUD1 as a target for treating heart failure.
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Affiliation(s)
- Qinyan Wang
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China; Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Shiqi Liang
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China; Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Jinfu Qian
- Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Jiachen Xu
- Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Qingsong Zheng
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China
| | - Mengyang Wang
- Department of Pharmacology, College of Pharmacy, Beihua University, Jilin, Jilin 132013, China
| | - Xiaochen Guo
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China
| | - Julian Min
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China
| | - Gaojun Wu
- Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Zaishou Zhuang
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China
| | - Wu Luo
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China; Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China.
| | - Guang Liang
- The Affiliated Cangnan Hospital and Chemical Biology Research Center, Wenzhou Medical University, Wenzhou 325000, Zhejiang, China; Department of Cardiology and Medical Research Center, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China; School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China.
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16
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Peng Y, Qin D, Wang Y, Gao W, Xu X. Pharmacological inhibition of ICOS attenuates the protective effect of exercise on cardiac fibrosis induced by isoproterenol. Eur J Pharmacol 2024; 965:176327. [PMID: 38224847 DOI: 10.1016/j.ejphar.2024.176327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 12/14/2023] [Accepted: 01/09/2024] [Indexed: 01/17/2024]
Abstract
AIMS To investigate the cardioprotective mechanism of exercise or exercise combined with inducible costimulatory molecules (ICOS) monoclonal antibody (mAb) therapy against isoproterenol (ISO)-induced cardiac remodeling. MAIN METHODS Totally 24 male C57BL/6J mice were randomly divided into four groups: the control group (normal saline treatment), ISO group (subcutaneous injection of isoproterenol, 10 mg/kg/day, once daily for 5 consecutive days), the exercise with subcutaneous ISO injection group (EPI), and the exercise with injected with ISO and ICOS mAb group (EPII). The mice in EPI and EPII group were trained on a small animal treadmill for 4 weeks (13 m/min, 0% grade, 60min/day). KEY FINDINGS Exercise significantly attenuated CD45+, Mac-2 inflammatory cell infiltration, cardiac fibrosis and inhibited the RIPK1/RIPK3/MLKL/CaMKII and cardiomyocyte pyroptosis pathways to counter ISO-induced severe cardiac injury. The administration of the ICOS mAb may inhibit the cardioprotection of exercise against ISO-induced heart damage. Compared to those in EPI, our data showed that the increasing levels of myocardial fibrosis, the leukocyte infiltration of cardiac tissue and proteins expression of cardiac myocyte necrosis and pyroptosis signaling pathways in the EPII group. SIGNIFICANCE Our results demonstrated that exercise decreased leukocyte infiltration in heart, inhibited the cardiomyocyte pyroptosis and necroptosis signaling pathways, and attenuated inflammatory responses to alleviate ISO-induced cardiac fibrosis. However, the antifibrotic effects of combined treatment with exercise and ICOS mAb intervention did not exhibit synergistic enhancement.
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Affiliation(s)
- Yong Peng
- School of Kinesiology, Shanghai University of Sport, Shanghai, China; Jiangsu Collaborative Innovation Center for Sports and Health Project, Nanjing Sport Institute, Nanjing, Jiangsu, China; Key Laboratory of Exercise Training and Rehabilitation for Jiangsu Province, Nanjing Sport Institute, Nanjing, Jiangsu, China
| | - Di Qin
- School of Sport and Health, Nanjing Sport Institute, Nanjing, Jiangsu, China
| | - Yudi Wang
- School of Physical Education and Nursing, Chengdu College of Arts and Sciences, Chengdu, Sichuan, China
| | - Wenyue Gao
- School of Sport and Health, Nanjing Sport Institute, Nanjing, Jiangsu, China
| | - Xin Xu
- School of Kinesiology, Shanghai University of Sport, Shanghai, China.
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Oknińska M, Duda MK, Czarnowska E, Bierła J, Paterek A, Mączewski M, Mackiewicz U. Sex- and age-dependent susceptibility to ventricular arrhythmias in the rat heart ex vivo. Sci Rep 2024; 14:3460. [PMID: 38342936 PMCID: PMC10859380 DOI: 10.1038/s41598-024-53803-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 02/05/2024] [Indexed: 02/13/2024] Open
Abstract
The incidence of life-threatening ventricular arrhythmias, the most common cause of sudden cardiac death (SCD), depends largely on the arrhythmic substrate that develops in the myocardium during the aging process. There is a large deficit of comparative studies on the development of this substrate in both sexes, with a particular paucity of studies in females. To identify the substrates of arrhythmia, fibrosis, cardiomyocyte hypertrophy, mitochondrial density, oxidative stress, antioxidant defense and intracellular Ca2+ signaling in isolated cardiomyocytes were measured in the hearts of 3- and 24-month-old female and male rats. Arrhythmia susceptibility was assessed in ex vivo perfused hearts after exposure to isoproterenol (ISO) and hydrogen peroxide (H2O2). The number of ventricular premature beats (PVBs), ventricular tachycardia (VT) and ventricular fibrillation (VF) episodes, as well as intrinsic heart rate, QRS and QT duration, were measured in ECG signals recorded from the surfaces of the beating hearts. After ISO administration, VT/VFs were formed only in the hearts of males, mainly older ones. In contrast, H2O2 led to VT/VF formation in the hearts of rats of both sexes but much more frequently in older males. We identified several components of the arrhythmia substrate that develop in the myocardium during the aging process, including high spontaneous ryanodine receptor activity in cardiomyocytes, fibrosis of varying severity in different layers of the myocardium (nonheterogenic fibrosis), and high levels of oxidative stress as measured by nitrated tyrosine levels. All of these elements appeared at a much greater intensity in male individuals during the aging process. On the other hand, in aging females, antioxidant defense at the level of H2O2 detoxification, measured as glutathione peroxidase expression, was weaker than that in males of the same age. We showed that sex has a significant effect on the development of an arrhythmic substrate during aging. This substrate determines the incidence of life-threatening ventricular arrhythmias in the presence of additional stimuli with proarrhythmic potential, such as catecholamine stimulation or oxidative stress, which are constant elements in the pathomechanism of most cardiovascular diseases.
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Affiliation(s)
- Marta Oknińska
- Department of Clinical Physiology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813, Warsaw, Poland
| | - Monika Katarzyna Duda
- Department of Clinical Physiology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813, Warsaw, Poland
| | - Elżbieta Czarnowska
- Department of Pathology, The Children's Memorial Health Institute, Aleja Dzieci Polskich 20, 04-736, Warsaw, Poland
- Department of Pathology, Medical University of Warsaw, Żwirki i Wigury 61, 02-091, Warsaw, Poland
| | - Joanna Bierła
- Department of Pathology, The Children's Memorial Health Institute, Aleja Dzieci Polskich 20, 04-736, Warsaw, Poland
| | - Aleksandra Paterek
- Department of Clinical Physiology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813, Warsaw, Poland
| | - Michał Mączewski
- Department of Clinical Physiology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813, Warsaw, Poland
| | - Urszula Mackiewicz
- Department of Clinical Physiology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813, Warsaw, Poland.
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Yang ZJ, Guo CL, Gong YX, Li L, Wang LL, Liu HM, Cao JM, Lu ZY. Dapagliflozin Suppresses Isoprenaline-Induced Cardiac Hypertrophy Through Inhibition of Mitochondrial Fission. J Cardiovasc Pharmacol 2024; 83:193-204. [PMID: 38030139 PMCID: PMC10842662 DOI: 10.1097/fjc.0000000000001518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 11/11/2023] [Indexed: 12/01/2023]
Abstract
ABSTRACT Dapagliflozin (DAPA) is a novel oral hypoglycemic agent, and there is increasing evidence that DAPA has a protective effect against cardiovascular disease. The study aimed to investigate how DAPA inhibits cardiac hypertrophy and explore its potential mechanisms. By continuously infusing isoprenaline (ISO) for 2 weeks using a subcutaneous osmotic pump, a cardiac hypertrophic model was established in male C57BL/6 mice. On day 14 after surgery, echocardiography showed that left ventricle mass (LV mass), interventricular septum, left ventricle posterior wall diastole, and left ventricular posterior wall systole were significantly increased, and ejection fraction was decreased compared with control mice. Masson and Wheat Germ Agglutinin staining indicated enhanced myocardial fibrosis and cell morphology compared with control mice. Importantly, these effects were inhibited by DAPA treatment in ISO-induced mice. In H9c2 cells and neonatal rat cardiomyocytes, we found that mitochondrial fragmentation and mitochondrial oxidative stress were significantly augmented in the ISO-induced group. However, DAPA rescued the cardiac hypertrophy in ISO-induced H9c2 cells and neonatal rat cardiomyocytes. Mechanistically, we found that DAPA restored the PIM1 activity in ISO-induced H9c2 cells and subsequent increase in dynamin-associated protein 1 (Drp1) phosphorylation at S616 and decrease in Drp1 phosphorylation at S637 in ISO-induced cells. We found that DAPA mitigated ISO-induced cardiac hypertrophy by suppressing Drp1-mediated mitochondrial fission in a PIM1-dependent fashion.
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Affiliation(s)
- Zhuo-Jing Yang
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Department of Physiology, Shanxi Medical University, Taiyuan, China
- Department of Nursing, Shanxi Provincial People's Hospital, Taiyuan, China
| | - Chun-Ling Guo
- Department of Cardiology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Yu-Xin Gong
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Department of Physiology, Shanxi Medical University, Taiyuan, China
- Department of Hematology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Long Li
- Department of Cardiology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Li-li Wang
- Department of Nursing, Shanxi Provincial People's Hospital, Taiyuan, China
| | - Hui-Min Liu
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Department of Physiology, Shanxi Medical University, Taiyuan, China
- Department of Hematology, The Second Hospital of Shanxi Medical University, Taiyuan, China
- Liangzhu Laboratory, Zhejiang University Medical Center, Hangzhou, China; and
| | - Ji-Min Cao
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Department of Physiology, Shanxi Medical University, Taiyuan, China
| | - Zhao-Yang Lu
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Department of Physiology, Shanxi Medical University, Taiyuan, China
- Department of Cardiology, The Second Hospital of Shanxi Medical University, Taiyuan, China
- Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province, Department of Cardiology, Sir Run Shaw Hospital, Zhejiang University, Hangzhou, China
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19
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Ham S, Mukaida S, Sato M, Keov P, Bengtsson T, Furness S, Holliday ND, Evans BA, Summers RJ, Hutchinson DS. Role of G protein-coupled receptor kinases (GRKs) in β 2 -adrenoceptor-mediated glucose uptake. Pharmacol Res Perspect 2024; 12:e1176. [PMID: 38332691 PMCID: PMC10853676 DOI: 10.1002/prp2.1176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/17/2023] [Accepted: 01/22/2024] [Indexed: 02/10/2024] Open
Abstract
Truncation of the C-terminal tail of the β2 -AR, transfection of βARKct or over-expression of a kinase-dead GRK mutant reduces isoprenaline-stimulated glucose uptake, indicating that GRK is important for this response. We explored whether phosphorylation of the β2 -AR by GRK2 has a role in glucose uptake or if this response is related to the role of GRK2 as a scaffolding protein. CHO-GLUT4myc cells expressing wild-type and mutant β2 -ARs were generated and receptor affinity for [3 H]-CGP12177A and density of binding sites determined together with the affinity of isoprenaline and BRL37344. Following receptor activation by β2 -AR agonists, cAMP accumulation, GLUT4 translocation, [3 H]-2-deoxyglucose uptake, and β2 -AR internalization were measured. Bioluminescence resonance energy transfer was used to investigate interactions between β2 -AR and β-arrestin2 or between β2 -AR and GRK2. Glucose uptake after siRNA knockdown or GRK inhibitors was measured in response to β2 -AR agonists. BRL37344 was a poor partial agonist for cAMP generation but displayed similar potency and efficacy to isoprenaline for glucose uptake and GLUT4 translocation. These responses to β2 -AR agonists occurred in CHO-GLUT4myc cells expressing β2 -ARs lacking GRK or GRK/PKA phosphorylation sites as well as in cells expressing the wild-type β2 -AR. However, β2 -ARs lacking phosphorylation sites failed to recruit β-arrestin2 and did not internalize. GRK2 knock-down or GRK2 inhibitors decreased isoprenaline-stimulated glucose uptake in rat L6 skeletal muscle cells. Thus, GRK phosphorylation of the β2 -AR is not associated with isoprenaline- or BRL37344-stimulated glucose uptake. However, GRKs acting as scaffold proteins are important for glucose uptake as GRK2 knock-down or GRK2 inhibition reduces isoprenaline-stimulated glucose uptake.
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Affiliation(s)
- Seungmin Ham
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Saori Mukaida
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Masaaki Sato
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Peter Keov
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Tore Bengtsson
- Atrogi ABStockholmSweden
- Department of Molecular BiosciencesThe Wenner‐Gren Institute, Stockholm UniversityStockholmSweden
| | - Sebastian Furness
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Nicholas D. Holliday
- School of Life Sciences, The Medical School, Queen's Medical CentreUniversity of NottinghamNottinghamUK
- Excellerate Bioscience, BiocityNottinghamUK
| | - Bronwyn A. Evans
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Roger J. Summers
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
| | - Dana S. Hutchinson
- Drug Discovery BiologyMonash Institute of Pharmaceutical Sciences, Monash UniversityParkvilleVictoriaAustralia
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Hirata T, Baba S, Akagi K, Matsuda K, Umeda K, Adachi S, Heike T, Takita J. Chloroquine decreases cardiac fibrosis and improves cardiac function in a mouse model of Duchenne muscular dystrophy. PLoS One 2024; 19:e0297083. [PMID: 38295120 PMCID: PMC10830020 DOI: 10.1371/journal.pone.0297083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 12/23/2023] [Indexed: 02/02/2024] Open
Abstract
BACKGROUND Duchenne muscular dystrophy (DMD), a severe degenerative skeletal and cardiac muscle disease, has a poor prognosis, and no curative treatments are available. Because decreased autophagy has been reported to contribute to skeletal muscle degeneration, therapies targeting autophagy are expected to improve skeletal muscle hypofunction. However, the role of this regulatory mechanism has not been evaluated clearly in DMD cardiomyocytes. METHODS In this present study, we evaluated myocardial fibrosis and its mechanism in mdx mice, a model of DMD, and also evaluated changes in cardiac function. RESULTS As assessed by LC3 immunohistochemistry, a small number of autophagosomes were detected in cardiomyocytes of both mdx mice and control wild-type (WT) mice. The number of autophagosomes was significantly enhanced by 4 weeks of isoproterenol-induced cardiac stress in cardiomyocytes of mdx but not WT mice. Simultaneously, isoproterenol increased cardiomyocyte fibrosis in mdx but not WT mice. Administration of chloroquine significantly decreased cardiomyocyte fibrosis in mdx mice, even after isoproterenol treatment. Left ventricle size and function were evaluated by echocardiography. Left ventricular contraction was decreased in mdx mice after isoproterenol treatment compared with control mice, which was alleviated by chloroquine administration. CONCLUSIONS Heart failure in DMD patients is possibly treated with chloroquine, and the mechanism probably involves chloroquine's anti-inflammatory effects.
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Affiliation(s)
- Takuya Hirata
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Shiro Baba
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Kentaro Akagi
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Koichi Matsuda
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Katsutsugu Umeda
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Souichi Adachi
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Toshio Heike
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
| | - Junko Takita
- Department of Pediatrics, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto City, Japan
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21
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Yan X, Li M, Lan P, Xun M, Zhang Y, Shi J, Wang R, Zheng J. Regulation of Na+-K+-ATPase leads to disturbances of isoproterenol-induced cardiac dysfunction via interference of Ca2+-dependent cardiac metabolism. Clin Sci (Lond) 2024; 138:23-42. [PMID: 38060817 DOI: 10.1042/cs20231039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 01/06/2024]
Abstract
Reductions in Na+-K+-ATPase (NKA) activity and expression are often observed in the progress of various reason-induced heart failure (HF). However, NKA α1 mutation or knockdown cannot cause spontaneous heart disease. Whether the abnormal NKA α1 directly contributes to HF pathogenesis remains unknown. Here, we challenge NKA α1+/- mice with isoproterenol to evaluate the role of NKA α1 haploinsufficiency in isoproterenol (ISO)-induced cardiac dysfunction. Genetic knockdown of NKA α1 accelerated ISO-induced cardiac cell hypertrophy, heart fibrosis, and dysfunction. Further studies revealed decreased Krebs cycle, fatty acid oxidation, and mitochondrial OXPHOS in the hearts of NKA α1+/- mice challenged with ISO. In ISO-treated conditions, inhibition of NKA elevated cytosolic Na+, further reduced mitochondrial Ca2+ via mNCE, and then finally down-regulated cardiac cell energy metabolism. In addition, a supplement of DRm217 alleviated ISO-induced heart dysfunction, mitigated cardiac remodeling, and improved cytosolic Na+ and Ca2+ elevation and mitochondrial Ca2+ depression in the NKA α1+/- mouse model. The findings suggest that targeting NKA and mitochondria Ca2+ could be a promising strategy in the treatment of heart disease.
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Affiliation(s)
- Xiaofei Yan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
| | - Meihe Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
| | - Ping Lan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
| | - Meng Xun
- Department of Microbiology and Immunology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
| | - Ying Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
| | - Jinghui Shi
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Department of Clinical laboratory in Xi'an Fourth Hospital, Xi'an 710004, China
| | - Ruijia Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
| | - Jin Zheng
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
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22
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Xu J, Liang S, Wang Q, Zheng Q, Wang M, Qian J, Yu T, Lou S, Luo W, Zhou H, Liang G. JOSD2 mediates isoprenaline-induced heart failure by deubiquitinating CaMKIIδ in cardiomyocytes. Cell Mol Life Sci 2024; 81:18. [PMID: 38195959 DOI: 10.1007/s00018-023-05037-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 10/01/2023] [Accepted: 10/03/2023] [Indexed: 01/11/2024]
Abstract
Prolonged stimulation of β-adrenergic receptor (β-AR) can lead to sympathetic overactivity that causes pathologic cardiac hypertrophy and fibrosis, ultimately resulting in heart failure. Recent studies suggest that abnormal protein ubiquitylation may contribute to the pathogenesis of cardiac hypertrophy and remodeling. In this study, we demonstrated that deficiency of a deubiquitinase, Josephin domain-containing protein 2 (JOSD2), ameliorated isoprenaline (ISO)- and myocardial infarction (MI)-induced cardiac hypertrophy, fibrosis, and dysfunction both in vitro and in vivo. Conversely, JOSD2 overexpression aggravated ISO-induced cardiac pathology. Through comprehensive mass spectrometry analysis, we identified that JOSD2 interacts with Calcium-calmodulin-dependent protein kinase II (CaMKIIδ). JOSD2 directly hydrolyzes the K63-linked polyubiquitin chains on CaMKIIδ, thereby increasing the phosphorylation of CaMKIIδ and resulting in calcium mishandling, hypertrophy, and fibrosis in cardiomyocytes. In vivo experiments showed that the cardiac remodeling induced by JOSD2 overexpression could be reversed by the CaMKIIδ inhibitor KN-93. In conclusion, our study highlights the role of JOSD2 in mediating ISO-induced cardiac remodeling through the regulation of CaMKIIδ ubiquitination, and suggests its potential as a therapeutic target for combating the disease. Please check and confirm that the authors and their respective affiliations have been correctly identified and amend if necessary. All have been checked.
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Affiliation(s)
- Jiachen Xu
- Department of Cardiology, Medical Research Center, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Shiqi Liang
- Department of Cardiology, Medical Research Center, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Qinyan Wang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Qingsong Zheng
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Mengyang Wang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
- Department of Pharmacology, College of Pharmacy, Beihua University, Jilin, 132013, Jilin, China
| | - Jinfu Qian
- Department of Cardiology, Medical Research Center, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Tianxiang Yu
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Shuaijie Lou
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Wu Luo
- Department of Cardiology, Medical Research Center, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
| | - Hao Zhou
- Department of Cardiology, Medical Research Center, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
| | - Guang Liang
- Department of Cardiology, Medical Research Center, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, 311399, Zhejiang, China.
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23
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Li X, Wu Y, Yang Y, Wu Y, Yu X, Hu W. Omaveloxolone ameliorates isoproterenol-induced pathological cardiac hypertrophy in mice. Free Radic Res 2024; 58:57-68. [PMID: 38145457 DOI: 10.1080/10715762.2023.2299359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 12/19/2023] [Indexed: 12/26/2023]
Abstract
Nuclear factor erythroid 2-related factor 2 (Nrf2) is an important transcriptional regulator that plays a protective role against various cardiovascular diseases. Omaveloxolone is a newly discovered potent activator of Nrf2 that has a variety of cytoprotective functions. However, the potential role of omaveloxolone in the process of pathological cardiac hypertrophy and heart failure are still unknown. In this study, an isoproterenol (ISO)-induced pathological cardiac hypertrophy model was established to investigate the protective effect of omaveloxolone in vivo and in vitro. Our study first confirmed that omaveloxolone administration improved ISO-induced pathological cardiac hypertrophy in mice and neonatal cardiomyocytes. Omaveloxolone administration also diminished ISO-induced cardiac oxidative stress, inflammation and cardiomyocyte apoptosis. In addition, omaveloxolone administration activated the Nrf2 signaling pathway, and Nrf2 knockdown almost completely abolished the cardioprotective effect of omaveloxolone, indicated that the cardioprotective effect of omaveloxolone was directly related to the activation of the Nrf2 signaling. In summary, our study identified that omaveloxolone may be a promising therapeutic agent to mitigate pathological cardiac hypertrophy.
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Affiliation(s)
- Xianchao Li
- Health Science Center, Yangtze University, Huanggang Central Hospital of Yangtze University, Huanggang, China
| | - Yang Wu
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yunzhao Yang
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yaohua Wu
- Health Science Center, Yangtze University, Huanggang Central Hospital of Yangtze University, Huanggang, China
| | - Xi Yu
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Wenjuan Hu
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, China
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24
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Ismail H, Gabriels JK, Chang D, Donnelly J, Kim BS, Epstein LM, Hentz R, Fishbein J, Huang X, Kowalski M, Dasrat P, Rahyab AS, Goldner B. Site-specific effects of dobutamine on cardiac conduction and refractoriness. J Interv Card Electrophysiol 2024; 67:71-82. [PMID: 37227538 DOI: 10.1007/s10840-023-01573-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 05/15/2023] [Indexed: 05/26/2023]
Abstract
BACKGROUND Isoproterenol, a non-specific beta agonist, is commonly used during electrophysiology studies (EPS). However, with the significant increase in the price of isoproterenol in 2015 and the increasing number of catheter ablations performed, the cost implications cannot be ignored. Dobutamine is a less expensive synthetic compound developed from isoproterenol with a similar mechanism to enhance cardiac conduction and shorten refractoriness, thus making it a feasible substitute with a lower cost. However, the use of dobutamine for EPS has not been well-reported in the literature. OBJECTIVE To determine the site-specific effects of various doses of dobutamine on cardiac conduction and refractoriness and assess its safety during EPS. METHODS From February 2020 to October 2020, 40 non-consecutive patients scheduled for elective EPS, supraventricular tachycardia, atrial fibrillation, and premature ventricular contraction ablations at a single center were consented and prospectively enrolled to assess the effect of dobutamine on the cardiac conduction system. At the end of each ablation procedure, measures of cardiac conduction and refractoriness were recorded at baseline and with incremental doses of dobutamine at 5, 10, 15, and 20 mcg/kg/min. For the primary analysis, the change per dose of dobutamine from baseline to each dosing level of dobutamine received by the patients, comparing atrioventricular node block cycle length (AVNBCL), ventricular atrial block cycle length (VABCL) and sinus cycle length (SCL), was tested using mixed-effect regression. For the secondary analysis, dobutamine dose level was tested for association with relative changes from baseline of each electrophysiologic parameter (SCL, AVNBCL, VABCL, atrioventricular node effective refractory period (AVNERP), AH, QRS, QT, QTc, atrial effective refractory period (AERP), ventricular effective refractory period (VERP), using mixed-effect regression. Changes in systolic and diastolic blood pressures were also assessed. The Holm-Bonferroni method was used to adjust for multiple testing. RESULTS For the primary analysis there was no statistically significant change of AVNBCL and VABCL relative to SCL from baseline to each dose level of dobutamine. The SCL, AVNBCL, VABCL, AVNERP, AERP, VERP and the AH, and QT intervals all demonstrated a statistically significant decrease from baseline to at least one dose level with incremental dobutamine dosing. Two patients (5%) developed hypotension during the study and one patient (2.5%) received a vasopressor. Two patients (5%) had induced arrhythmias but otherwise no major adverse events were noted. CONCLUSION In this study, there was no statistically significant change of AVNBCL and VABCL relative to SCL from baseline to any dose level of dobutamine. As expected, the AH and QT intervals, and the VABCL, VERP, AERP and AVNERP all significantly decreased from baseline to at least one dose level with an escalation in dobutamine dose. Dobutamine was well-tolerated and safe to use during EPS.
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Affiliation(s)
- Haisam Ismail
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - James K Gabriels
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - David Chang
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Joseph Donnelly
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Beom Soo Kim
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Laurence M Epstein
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Roland Hentz
- Biostatistics Unit, Office of Academic Affairs, Northwell Health, New York, NY, USA
| | - Joanna Fishbein
- Biostatistics Unit, Office of Academic Affairs, Northwell Health, New York, NY, USA
| | - Xueqi Huang
- Biostatistics Unit, Office of Academic Affairs, Northwell Health, New York, NY, USA
| | - Marcin Kowalski
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Parmanand Dasrat
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Ali Seyar Rahyab
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA
| | - Bruce Goldner
- Department of Cardiac Electrophysiology, Northwell Health, New York, NY, USA.
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Dorey TW, McRae MD, Belke DD, Rose RA. PDE4D mediates impaired β-adrenergic receptor signalling in the sinoatrial node in mice with hypertensive heart disease. Cardiovasc Res 2023; 119:2697-2711. [PMID: 37643895 PMCID: PMC10757582 DOI: 10.1093/cvr/cvad138] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 06/06/2023] [Accepted: 07/18/2023] [Indexed: 08/31/2023] Open
Abstract
AIMS The sympathetic nervous system increases HR by activating β-adrenergic receptors (β-ARs) and increasing cAMP in sinoatrial node (SAN) myocytes while phosphodiesterases (PDEs) degrade cAMP. Chronotropic incompetence, the inability to regulate heart rate (HR) in response to sympathetic nervous system activation, is common in hypertensive heart disease; however, the basis for this is poorly understood. The objective of this study was to determine the mechanisms leading to chronotropic incompetence in mice with angiotensin II (AngII)-induced hypertensive heart disease. METHODS AND RESULTS C57BL/6 mice were infused with saline or AngII (2.5 mg/kg/day for 3 weeks) to induce hypertensive heart disease. HR and SAN function in response to the β-AR agonist isoproterenol (ISO) were studied in vivo using telemetry and electrocardiography, in isolated atrial preparations using optical mapping, in isolated SAN myocytes using patch-clamping, and using molecular biology. AngII-infused mice had smaller increases in HR in response to physical activity and during acute ISO injection. Optical mapping of the SAN in AngII-infused mice demonstrated impaired increases in conduction velocity and altered conduction patterns in response to ISO. Spontaneous AP firing responses to ISO in isolated SAN myocytes from AngII-infused mice were impaired due to smaller increases in diastolic depolarization (DD) slope, hyperpolarization-activated current (If), and L-type Ca2+ current (ICa,L). These changes were due to increased localization of PDE4D surrounding β1- and β2-ARs in the SAN, increased SAN PDE4 activity, and reduced cAMP generation in response to ISO. Knockdown of PDE4D using a virus-delivered shRNA or inhibition of PDE4 with rolipram normalized SAN sensitivity to β-AR stimulation in AngII-infused mice. CONCLUSIONS AngII-induced hypertensive heart disease results in impaired HR responses to β-AR stimulation due to up-regulation of PDE4D and reduced effects of cAMP on spontaneous AP firing in SAN myocytes.
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Affiliation(s)
- Tristan W Dorey
- Libin Cardiovascular Institute, Department of Cardiac Sciences, Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, T2N 4Z6, Canada
| | - Megan D McRae
- Libin Cardiovascular Institute, Department of Cardiac Sciences, Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, T2N 4Z6, Canada
| | - Darrell D Belke
- Libin Cardiovascular Institute, Department of Cardiac Sciences, Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, T2N 4Z6, Canada
| | - Robert A Rose
- Libin Cardiovascular Institute, Department of Cardiac Sciences, Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, T2N 4Z6, Canada
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Power AS, Asamudo EU, Worthington LP, Alim CC, Parackal RE, Wallace RS, Ebenebe OV, Heller Brown J, Kohr MJ, Bers DM, Erickson JR. Nitric Oxide Modulates Ca 2+ Leak and Arrhythmias via S-Nitrosylation of CaMKII. Circ Res 2023; 133:1040-1055. [PMID: 37961889 PMCID: PMC10699507 DOI: 10.1161/circresaha.123.323571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/29/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023]
Abstract
BACKGROUND Nitric oxide (NO) has been identified as a signaling molecule generated during β-adrenergic receptor stimulation in the heart. Furthermore, a role for NO in triggering spontaneous Ca2+ release via S-nitrosylation of CaMKIIδ (Ca2+/calmodulin kinase II delta) is emerging. NO donors are routinely used clinically for their cardioprotective effects on the heart, but it is unknown how NO donors modulate the proarrhythmic CaMKII to alter cardiac arrhythmia incidence. We test the role of S-nitrosylation of CaMKIIδ at the Cysteine-273 inhibitory site and cysteine-290 activating site in cardiac Ca2+ handling and arrhythmogenesis before and during β-adrenergic receptor stimulation. METHODS We measured Ca2+-handling in isolated cardiomyocytes from C57BL/6J wild-type (WT) mice and mice lacking CaMKIIδ expression (CaMKIIδ-KO) or with deletion of the S-nitrosylation site on CaMKIIδ at cysteine-273 or cysteine-290 (CaMKIIδ-C273S and -C290A knock-in mice). Cardiomyocytes were exposed to NO donors, S-nitrosoglutathione (GSNO; 150 μM), sodium nitroprusside (200 μM), and β-adrenergic agonist isoproterenol (100 nmol/L). RESULTS Both WT and CaMKIIδ-KO cardiomyocytes responded to isoproterenol with a full inotropic and lusitropic Ca2+ transient response as well as increased Ca2+ spark frequency. However, the increase in Ca2+ spark frequency was significantly attenuated in CaMKIIδ-KO cardiomyocytes. The protection from isoproterenol-induced Ca2+ sparks and waves was mimicked by GSNO pretreatment in WT cardiomyocytes but lost in CaMKIIδ-C273S cardiomyocytes. When GSNO was applied after isoproterenol, this protection was not observed in WT or CaMKIIδ-C273S but was apparent in CaMKIIδ-C290A. In Langendorff-perfused isolated hearts, GSNO pretreatment limited isoproterenol-induced arrhythmias in WT but not CaMKIIδ-C273S hearts, while GSNO exposure after isoproterenol sustained or exacerbated arrhythmic events. CONCLUSIONS We conclude that prior S-nitrosylation of CaMKIIδ at cysteine-273 can limit subsequent β-adrenergic receptor-induced arrhythmias, but that S-nitrosylation at cysteine-290 might worsen or sustain β-adrenergic receptor-induced arrhythmias. This has important implications for the administration of NO donors in the clinical setting.
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Affiliation(s)
- Amelia S. Power
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
- Department of Physiology, University of Auckland, New Zealand (A.S.P.)
| | - Esther U. Asamudo
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
- Department of Pharmacology, University of California, Davis (E.U.A., C.C.A., D.M.B.)
| | - Luke P.I. Worthington
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
| | - Chidera C. Alim
- Department of Pharmacology, University of California, Davis (E.U.A., C.C.A., D.M.B.)
| | - Raquel E. Parackal
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
| | - Rachel S. Wallace
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
| | - Obialunanma V. Ebenebe
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (O.V.E., M.J.K.)
| | - Joan Heller Brown
- Department of Pharmacology, University of California, San Diego, La Jolla (J.H.B.)
| | - Mark J. Kohr
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (O.V.E., M.J.K.)
| | - Donald M. Bers
- Department of Pharmacology, University of California, Davis (E.U.A., C.C.A., D.M.B.)
| | - Jeffrey R. Erickson
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
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Yovas A, Stanely SP, Issac R, Ponnian SMP. β-caryophyllene blocks reactive oxygen species-mediated hyperlipidemia in isoproterenol-induced myocardial infarcted rats. Eur J Pharmacol 2023; 960:176102. [PMID: 37827479 DOI: 10.1016/j.ejphar.2023.176102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/03/2023] [Accepted: 10/04/2023] [Indexed: 10/14/2023]
Abstract
Myocardial infarction (MI) is a leading cause of death. Lipid-lowering interventions have been shown to decrease coronary events and mortality of MI and heart failure. In this investigation, we assessed the anti-hyperlipidemic effects of β-caryophyllene in isoproterenol-induced myocardial infarcted rats. β-Caryophyllene (20 mg/kg body weight) pre-and co-treatment was given to rats orally, daily, for 3 weeks. Isoproterenol (100 mg/kg body weight) was administered to rats to induce MI. The levels of serum cardiac troponins T and I, serum and heart total cholesterol, triglycerides, free fatty acids, and the levels of serum low-density and very low-density lipoprotein-cholesterols were augmented, and the level of serum high-density lipoprotein-cholesterol was lessened in myocardial infarcted rats. Further, the activity/levels of liver 3-hydroxy-3-methylglutaryl-coenzyme A reductase and plasma thiobarbituric acid reactive substances were amplified and the activity/levels of heart glutathione -S- transferase, vitamin C, and vitamin E were lessened by isoproterenol. A down-regulated expression of liver sterol regulatory element-binding protein-2 and liver low-density lipoprotein-receptor genes was observed by a reverse transcription-polymerase chain reaction study. Moreover, histopathology of Sudan III staining revealed an accumulation of fats in the heart of isoproterenol-induced rats. Nevertheless, β-caryophyllene pre-and co-treatment blocked alterations in all the parameters examined in isoproterenol-induced rats and inhibited the risk of MI. Moreover, the in vitro study revealed the potent free radical scavenging and antioxidant effects of β-caryophyllene. β-Caryophyllene's antioxidant and anti-hyperlipidemic properties are the possible mechanisms for the observed protective effects in this investigation.
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Affiliation(s)
- Anita Yovas
- Medicinal and Biomolecular Chemistry Laboratory, Department of Biochemistry and Biotechnology, Annamalai University, Annamalai Nagar, 608 002, Tamil Nadu, India
| | - Shervin Prince Stanely
- Department of Biotechnology, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India
| | - Reya Issac
- Department of Biotechnology, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India
| | - Stanely Mainzen Prince Ponnian
- Medicinal and Biomolecular Chemistry Laboratory, Department of Biochemistry and Biotechnology, Annamalai University, Annamalai Nagar, 608 002, Tamil Nadu, India.
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Judina A, Niglas M, Leonov V, Kirkby NS, Diakonov I, Wright PT, Zhao L, Mitchell JA, Gorelik J. Pulmonary Hypertension-Associated Right Ventricular Cardiomyocyte Remodelling Reduces Treprostinil Function. Cells 2023; 12:2764. [PMID: 38067192 PMCID: PMC10705885 DOI: 10.3390/cells12232764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/30/2023] [Accepted: 12/02/2023] [Indexed: 12/18/2023] Open
Abstract
(1) Pulmonary hypertension (PH)-associated right ventricular (RV) failure is linked to a reduction in pulmonary vasodilators. Treprostinil has shown effectiveness in PAH patients with cardiac decompensation, hinting at potential cardiac benefits. We investigated treprostinil's synergy with isoprenaline in RV and LV cardiomyocytes. We hypothesised that disease-related RV structural changes in cardiomyocytes would reduce contractile responses and cAMP/PKA signalling activity. (2) We induced PH in male Sprague Dawley rats using monocrotaline and isolated their ventricular cardiomyocytes. The effect of in vitro treprostinil and isoprenaline stimulation on contraction was assessed. FRET microscopy was used to study PKA activity associated with treprostinil stimulation in AKAR3-NES FRET-based biosensor-expressing cells. (3) RV cells exhibited maladaptive remodelling with hypertrophy, impaired contractility, and calcium transients compared to control and LV cardiomyocytes. Combining treprostinil and isoprenaline failed to enhance inotropy in PH RV cardiomyocytes. PH RV cardiomyocytes displayed an aberrant contractile behaviour, which the combination treatment could not rectify. Finally, we observed decreased PKA activity in treprostinil-treated PH RV cardiomyocytes. (4) PH-associated RV cardiomyocyte remodelling reduced treprostinil sensitivity, inotropic support, and impaired relaxation. Overall, this study highlights the complexity of RV dysfunction in advanced PH and suggests the need for alternative therapeutic strategies.
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Affiliation(s)
- Aleksandra Judina
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
| | - Marili Niglas
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
| | - Vladislav Leonov
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
- Department of Surgery, Dentistry, Pediatrics and Gynecology, Cardiovascular Science, The University of Verona, 37134 Verona, Italy
| | - Nicholas S. Kirkby
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
| | - Ivan Diakonov
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
| | - Peter T. Wright
- Definitely School of Life and Health Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London SW15 4JD, UK;
| | - Lan Zhao
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
| | - Jane A. Mitchell
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
| | - Julia Gorelik
- Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK; (A.J.); (M.N.); (V.L.); (N.S.K.); (I.D.); (L.Z.); (J.A.M.)
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Gomes LTDC, de Sena MO, Dantas PB, Barbosa AIDS, Holanda VAD, Oliveira JIN, Gavioli EC, da Silva Junior ED. Smooth muscle contraction of the fundus of stomach, duodenum and bladder from mice exposed to a stress-based model of depression. Physiol Behav 2023; 272:114374. [PMID: 37806511 DOI: 10.1016/j.physbeh.2023.114374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/09/2023] [Accepted: 10/05/2023] [Indexed: 10/10/2023]
Abstract
Several reports have demonstrated that depressive disorder is related to somatic symptoms including gastrointestinal or genitourinary alterations. The pathophysiological mechanisms underlying the gastrointestinal or genitourinary alterations associated with the depression are still not fully understood. Therefore, this study aimed to evaluate the motor activity of gastrointestinal (fundus of stomach and duodenum) and genitourinary tract (bladder) in a stress-based animal model of depression. Adult male mice were submitted to uncontrollable and unpredictable stress (learned helplessness model), controllable stress and non-stressful situations (control). Then, animals were euthanized and the fundus of stomach, duodenum segments or whole bladder were isolated and mounted in a standard organ bath preparation. We evaluated the contractile effects induced by KCl 80 mM for 5 min or carbachol (acetylcholine receptor agonist). The relaxant effects of isoproterenol (β-adrenoceptor agonist) were also checked. Animals submitted to the learned helplessness model developed a helpless (depressive-like behavior) or resilient (does not exhibit depressive-like behavior) phenotype. The contractions induced by carbachol were diminished in fundus of stomach isolated from helpless and resilient animals. The isoproterenol-induced fundus of stomach relaxation was reduced in resilient but not helpless mice. The contractions/relaxation of duodenum segments isolated from helpless or resilient animals were not altered. Both helpless and resilient animals showed an increase in the bladder contractions induced by carbachol while the relaxant effects of isoproterenol were reduced when compared to control. Conversely, mice underwent a controllable stress situation did not exhibit alterations in the fundus of stomach or duodenum contraction/relaxation induced by pharmacological agents although a decrease in the bladder contraction induced by carbachol was found. In conclusion, incontrollable and unpredictable stress and not depressive phenotype (helpless animals) or controllable stress could be related to the alterations in motor activity of the fundus of stomach and bladder.
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Affiliation(s)
- Luana Talinne da Costa Gomes
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Maele Oliveira de Sena
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Pedro Brüch Dantas
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Aldemara Ingrid da Silva Barbosa
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Victor Anastácio Duarte Holanda
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Jonas Ivan Nobre Oliveira
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Elaine Cristina Gavioli
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil
| | - Edilson Dantas da Silva Junior
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte, Av. Senador Salgado Filho, s/n Campus Universitário - Lagoa Nova, Natal, RN 59072-970, Brazil.
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Ge M, Wu L, He F, Tai Y, Fang R, Han D, Guo P, Liu H, Hu Y, Xu S, Wei W, Wang Q. CP-25 inhibits the hyperactivation of rheumatic synoviocytes by suppressing the switch in G αs-G αi coupling to the β 2-adrenergic receptor. Cell Commun Signal 2023; 21:346. [PMID: 38037039 PMCID: PMC10688045 DOI: 10.1186/s12964-023-01358-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 10/16/2023] [Indexed: 12/02/2023] Open
Abstract
In essence, the β2 adrenergic receptor (β2AR) plays an antiproliferative role by increasing the intracellular cyclic 3',5'-adenosine monophosphate (cAMP) concentration through Gαs coupling, but interestingly, β2AR antagonists are able to effectively inhibit fibroblast-like synoviocytes (FLSs) proliferation, thus ameliorating experimental RA, indicating that the β2AR signalling pathway is impaired in RA FLSs via unknown mechanisms. The local epinephrine (Epi) level was found to be much higher in inflammatory joints than in normal joints, and high-level stimulation with Epi or isoproterenol (ISO) directly promoted FLSs proliferation and migration due to impaired β2AR signalling and cAMP production. By applying inhibitor of receptor internalization, and small interfering RNA (siRNA) of Gαs and Gαi, and by using fluorescence resonance energy transfer and coimmunoprecipitation assays, a switch in Gαs-Gαi coupling to β2AR was observed in inflammatory FLSs as well as in FLSs with chronic ISO stimulation. This Gαi coupling was then revealed to be initiated by G protein coupled receptor kinase 2 (GRK2) but not β-arrestin2 or protein kinase A-mediated phosphorylation of β2AR. Inhibiting the activity of GRK2 with the novel GRK2 inhibitor paeoniflorin-6'-O-benzene sulfonate (CP-25), a derivative of paeoniflorin, or the accepted GRK2 inhibitor paroxetine effectively reversed the switch in Gαs-Gαi coupling to β2AR during inflammation and restored the intracellular cAMP level in ISO-stimulated FLSs. As expected, CP-25 significantly inhibited the hyperplasia of FLSs in a collagen-induced arthritis (CIA) model (CIA FLSs) and normal FLSs stimulated with ISO and finally ameliorated CIA in rats. Together, our findings revealed the pathological changes in β2AR signalling in CIA FLSs, determined the underlying mechanisms and identified the pharmacological target of the GRK2 inhibitor CP-25 in treating CIA. Video Abstract.
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Affiliation(s)
- Mingli Ge
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
| | - Li Wu
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Feng He
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
| | - Yu Tai
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
| | - Ruhong Fang
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
| | - Dafei Han
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
| | - Paipai Guo
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China
| | - Hao Liu
- School of Pharmacy, Bengbu Medical College, Bengbu, 233030, China
| | - Yong Hu
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China
| | - Shenglin Xu
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China.
| | - Wei Wei
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China.
| | - Qingtong Wang
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-Inflammatory and Immune Medicine, Ministry of Education, Collaborative Innovation Center of Anti-Inflammatory and Immune Medicine, Hefei, 230032, China.
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Namekata I, Tamura M, Kase J, Hamaguchi S, Tanaka H. Cardioprotective Effect against Ischemia-Reperfusion Injury of PAK-200, a Dihydropyridine Analog with an Inhibitory Effect on Cl - but Not Ca 2+ Current. Biomolecules 2023; 13:1719. [PMID: 38136589 PMCID: PMC10741401 DOI: 10.3390/biom13121719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/25/2023] [Accepted: 11/27/2023] [Indexed: 12/24/2023] Open
Abstract
We examined the effects of a dihydropyridine analog, PAK-200, on guinea pig myocardium during experimental ischemia and reperfusion. In isolated ventricular cardiomyocytes, PAK-200 (1 μM) had no effect on the basal peak inward and steady-state currents but inhibited the isoprenaline-induced time-independent Cl- current. In the right atria, PAK-200 had no effect on the beating rate and the chronotropic response to isoprenaline. In an ischemia-reperfusion model with coronary-perfused right ventricular tissue, a decrease in contractile force and a rise in tension were observed during a period of 30-min no-flow ischemia. Upon reperfusion, contractile force returned to less than 50% of preischemic values. PAK-200 had no effect on the decline in contractile force during the no-flow ischemia but reduced the rise in resting tension. PAK-200 significantly improved the recovery of contractile force after reperfusion to about 70% of the preischemic value. PAK-200 was also shown to attenuate the decrease in tissue ATP during ischemia. Treatment of ventricular myocytes with an ischemia-mimetic solution resulted in depolarization of the mitochondrial membrane potential and an increase in cytoplasmic and mitochondrial Ca2+ concentrations. PAK-200 significantly delayed these changes. Thus, PAK-200 inhibits the cAMP-activated chloride current in cardiac muscle and may have protective effects against ischemia-reperfusion injury through novel mechanisms.
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Affiliation(s)
| | | | | | | | - Hikaru Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama Funabashi, Chiba 274-8510, Japan; (I.N.); (M.T.); (J.K.); (S.H.)
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32
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Scriven DR, Johnsen AB, Asghari P, Chou KC, Moore ED. Cardiomyocyte ryanodine receptor clusters expand and coalesce after application of isoproterenol. J Gen Physiol 2023; 155:e202213109. [PMID: 37728575 PMCID: PMC10513110 DOI: 10.1085/jgp.202213109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 01/23/2023] [Accepted: 09/02/2023] [Indexed: 09/21/2023] Open
Abstract
Earlier work has shown that ventricular ryanodine receptors (RyR2) within a cluster rearrange on phosphorylation as well as with a number of other stimuli. Using dSTORM, we investigated the effects of 300 nmol/liter isoproterenol on RyR2 clusters. In rat ventricular cardiomyocytes, there was a symmetrical enlargement of RyR2 cluster areas, a decrease in the edge-to-edge nearest neighbor distance, and distribution changes that suggested movement to increase the cluster areas by coalescence. The surface area covered by the phosphorylated clusters was significantly greater than in the control cells, as was the cluster density. This latter change was accompanied by a decreased cluster fragmentation, implying that new tetramers were brought into the sarcoplasmic reticulum. We propose a possible mechanism to explain these changes. We also visualized individual RyR2 tetramers and confirmed our earlier electron-tomographic finding that the tetramers are in a disorganized but non-random array occupying about half of the cluster area. Multiclusters, cluster groups defined by the maximum distance between their members, were analyzed for various distances. At 100 nm, the areas occupied by the multiclusters just exceeded those of the single clusters, and more than half of the multiclusters had only a single subcluster that could initiate a spark. Phosphorylation increased the size of the multiclusters, markedly so for distances >100 nm. There was no relationship between the number of subclusters in a group and the area covered by it. We conclude that isoproterenol induces rapid, significant, changes in the molecular architecture of excitation-contraction coupling.
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Affiliation(s)
- David R.L. Scriven
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, Canada
| | - Anne Berit Johnsen
- Department of Teacher Education, Norwegian University of Science and Technology, Trondheim, Norway
| | - Parisa Asghari
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, Canada
| | - Keng C. Chou
- Department of Chemistry, University of British Columbia, Vancouver, Canada
| | - Edwin D.W. Moore
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, Canada
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Valovič P, Behuliak M, Vaněčková I, Zicha J. Impaired vascular β-adrenergic relaxation in spontaneously hypertensive rats: The differences between conduit and resistance arteries. Eur J Pharmacol 2023; 958:176045. [PMID: 37708986 DOI: 10.1016/j.ejphar.2023.176045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 09/01/2023] [Accepted: 09/11/2023] [Indexed: 09/16/2023]
Abstract
It was suggested that impaired β-adrenergic relaxation in spontaneously hypertensive rats (SHR) might contribute to their high blood pressure (BP). Our study was focused on isoprenaline-induced dilatation of conduit femoral or resistance mesenteric arteries and on isoprenaline-induced BP reduction in SHR and Wistar-Kyoto rats (WKY). We confirmed decreased β-adrenergic relaxation of SHR femoral arteries due to the absence of its endothelium-independent component, whereas endothelium-dependent component of β-adrenergic smooth muscle relaxation was similar in both strains. Conversely, isoprenaline-induced relaxation of resistance mesenteric arteries was similar in both strains and this was true for endothelium-dependent and endothelium-independent components. We observed moderately reduced sensitivity of SHR mesenteric arteries to salmeterol (β2-adrenergic agonist) and this strain difference disappeared after endothelium removal. However, there was no difference in mesenteric arteries relaxation by dobutamine (β1-adrenergic agonist) which was independent of endothelium. The increasing isoprenaline doses elicited similar BP decrease in both rat strains, although BP sensitivity to isoprenaline was slightly decreased in SHR. The blockade of cyclooxygenase (indomethacin) and NO synthase (L-NAME) further reduced BP sensitivity to isoprenaline in SHR. On the other hand, salmeterol elicited similar BP decrease in both strains and the blockade of cyclooxygenase and NO synthase increased BP sensitivity to salmeterol in SHR as compared to WKY. In conclusion, attenuated β-adrenergic vasodilatation of conduit arteries of SHR but similar β-adrenergic relaxation of resistance mesenteric arteries from WKY and SHR and their similar BP response to β-adrenergic agonists do not support major role of altered β-adrenergic vasodilatation for high BP in genetic hypertension.
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Affiliation(s)
- Pavol Valovič
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
| | - Michal Behuliak
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
| | - Ivana Vaněčková
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
| | - Josef Zicha
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.
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Dorey TW, Liu Y, Jansen HJ, Bohne LJ, Mackasey M, Atkinson L, Prasai S, Belke DD, Fatehi-Hassanabad A, Fedak PWM, Rose RA. Natriuretic Peptide Receptor B Protects Against Atrial Fibrillation by Controlling Atrial cAMP Via Phosphodiesterase 2. Circ Arrhythm Electrophysiol 2023; 16:e012199. [PMID: 37933567 DOI: 10.1161/circep.123.012199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 10/19/2023] [Indexed: 11/08/2023]
Abstract
BACKGROUND β-AR (β-adrenergic receptor) stimulation regulates atrial electrophysiology and Ca2+ homeostasis via cAMP-dependent mechanisms; however, enhanced β-AR signaling can promote atrial fibrillation (AF). CNP (C-type natriuretic peptide) can also regulate atrial electrophysiology through the activation of NPR-B (natriuretic peptide receptor B) and cGMP-dependent signaling. Nevertheless, the role of NPR-B in regulating atrial electrophysiology, Ca2+ homeostasis, and atrial arrhythmogenesis is incompletely understood. METHODS Studies were performed using atrial samples from human patients with AF or sinus rhythm and in wild-type and NPR-B-deficient (NPR-B+/-) mice. Studies were conducted in anesthetized mice by intracardiac electrophysiology, in isolated mouse atrial preparations using high-resolution optical mapping, in isolated mouse and human atrial myocytes using patch-clamping and Ca2+ imaging, and in mouse and human atrial tissues using molecular biology. RESULTS Atrial NPR-B protein levels were reduced in patients with AF, and NPR-B+/- mice were more susceptible to AF. Atrial cGMP levels and PDE2 (phosphodiesterase 2) activity were reduced in NPR-B+/- mice leading to larger increases in atrial cAMP in the presence of the β-AR agonist isoproterenol. NPR-B+/- mice displayed larger increases in action potential duration and L-type Ca2+ current in the presence of isoproterenol. This resulted in the occurrence of spontaneous sarcoplasmic reticulum Ca2+ release events and delayed afterdepolarizations in NPR-B+/- atrial myocytes. Phosphorylation of the RyR2 (ryanodine receptor) and phospholamban was increased in NPR-B+/- atria in the presence of isoproterenol compared with the wildtypes. C-type natriuretic peptide inhibited isoproterenol-stimulated L-type Ca2+ current through PDE2 in mouse and human atrial myocytes. CONCLUSIONS NPR-B protects against AF by preventing enhanced atrial responses to β-adrenergic receptor agonists.
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Affiliation(s)
- Tristan W Dorey
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Yingjie Liu
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Hailey J Jansen
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Loryn J Bohne
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Martin Mackasey
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Logan Atkinson
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada (L.A.)
| | - Shuvam Prasai
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Darrell D Belke
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Ali Fatehi-Hassanabad
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Paul W M Fedak
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
| | - Robert A Rose
- Department of Cardiac Sciences (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., D.D.B, A.F.-H., P.W.M.F., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
- Department of Physiology and Pharmacology (T.W.D., Y.L., H.J.J., L.J.B., M.M., S.P., R.A.R.), Libin Cardiovascular Institute, Cumming School of Medicine University of Calgary, Alberta, Canada
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Park KE, Lee S, Bae SI, Hwang Y, Ok SH, Ahn SH, Sim G, Chung S, Sohn JT. Theophylline-induced endothelium-dependent vasodilation is mediated by increased nitric oxide release and phosphodiesterase inhibition in rat aorta. Gen Physiol Biophys 2023; 42:469-478. [PMID: 37855238 DOI: 10.4149/gpb_2023023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 08/03/2023] [Indexed: 10/20/2023]
Abstract
This study aimed to examine the endothelial dependence of vasodilation induced by the phosphodiesterase inhibitor theophylline in isolated rat thoracic aortas and elucidate the underlying mechanism, with emphasis on endothelial nitric oxide (NO). The effects of various inhibitors and endothelial denudation on theophylline-induced vasodilation, and the effect of theophylline on vasodilation induced by NO donor sodium nitroprusside, cyclic guanosine monophosphate (cGMP) analog bromo-cGMP, and β-agonist isoproterenol in endothelium-denuded aorta were examined. The effects of theophylline and sodium nitroprusside on cGMP formation were also examined. We examined the effect of theophylline on endothelial nitric oxide synthase (eNOS) phosphorylation and intracellular calcium levels. Theophylline-induced vasodilation was greater in endothelium-intact aortas than that in endothelium-denuded aortas. The NOS inhibitor, NW-nitro-L-arginine methyl ester; non-specific guanylate cyclase (GC) inhibitor, methylene blue; and NO-sensitive GC inhibitor, 1H-[1,2,4]oxadiazolo[4,3-a] quinoxalin-1-one inhibited theophylline-induced vasodilation in endothelium-intact aortas. Theophylline increased the vasodilation induced by sodium nitroprusside, bromo-cGMP, and isoproterenol. Theophylline increased cGMP formation in endothelium-intact aortas, and sodium nitroprusside-induced cGMP formation in endothelium-denuded aortas. Moreover, theophylline increased stimulatory eNOS (Ser1177) phosphorylation and endothelial calcium levels, but decreased the phosphorylation of inhibitory eNOS (Thr495). These results suggested that theophylline-induced endothelium-dependent vasodilation was mediated by increased endothelial NO release and phosphodiesterase inhibition.
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Affiliation(s)
- Kyeong-Eon Park
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - SooHee Lee
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Changwon Hospital, Changwon-si, Gyeongsangnam-do, Republic of Korea
- Institute of Medical Science, Gyeongsang National University, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Sung Il Bae
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Yeran Hwang
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Seong-Ho Ok
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Changwon Hospital, Changwon-si, Gyeongsangnam-do, Republic of Korea
- Institute of Medical Science, Gyeongsang National University, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Seung Hyun Ahn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Institute of Medical Science, Gyeongsang National University, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Gyujin Sim
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Institute of Medical Science, Gyeongsang National University, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Soonghee Chung
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea
- Institute of Medical Science, Gyeongsang National University, Jinju-si, Gyeongsangnam-do, Republic of Korea
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Ahmed A, Abdel-Rahman D, Hantash EM. Role of canagliflozin in ameliorating isoprenaline induced cardiomyocyte oxidative stress via the heme oxygenase-1 mediated pathway. Biotech Histochem 2023; 98:593-605. [PMID: 37779487 DOI: 10.1080/10520295.2023.2262390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023] Open
Abstract
Canagliflozin (CZ) is commonly prescribed for management of type-2 diabetes mellitus (T2DM); it also can reduce the risk of myocardial infarction. We used 80 albino Wistar rats to investigate the cardioprotective potential of CZ against oxidative stress caused by administration of isoprenaline (ISO). We found that ISO stimulates production of reactive oxygen species and that CZ administration caused up-regulation of antioxidants and down-regulation of oxidants due to nuclear factor erythroid-2 related factor-2, as well as by enhancement of the heme oxygenase-1 mediated cascade. CZ monotherapy may play a cardioprotective role in diabetic patients. CZ possesses strong antioxidant potential that ameliorates cardiac damage induced by ISO administration.
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Affiliation(s)
- Ahmed Ahmed
- Anatomy and Embryology Department, College of Medicine, Tanta University, Tanta, Egypt
- Biomedical Sciences Department, College of Medicine, Gulf Medical University, Ajman, United Arab Emirates
| | - Dina Abdel-Rahman
- Department of Pathology, College of Medicine, Beni-Suef University, Beni-Suef, Egypt
| | - Ehab M Hantash
- Anatomy and Embryology Department, College of Medicine, Tanta University, Tanta, Egypt
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Selli AL, Ghasemi M, Watters T, Burton F, Smith G, Dietrichs ES. Proarrhythmic changes in human cardiomyocytes during hypothermia by milrinone and isoprenaline, but not levosimendan: an experimental in vitro study. Scand J Trauma Resusc Emerg Med 2023; 31:61. [PMID: 37880801 PMCID: PMC10601188 DOI: 10.1186/s13049-023-01134-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 10/15/2023] [Indexed: 10/27/2023] Open
Abstract
BACKGROUND Accidental hypothermia, recognized by core temperature below 35 °C, is a lethal condition with a mortality rate up to 25%. Hypothermia-induced cardiac dysfunction causing increased total peripheral resistance and reduced cardiac output contributes to the high mortality rate in this patient group. Recent studies, in vivo and in vitro, have suggested levosimendan, milrinone and isoprenaline as inotropic treatment strategies in this patient group. However, these drugs may pose increased risk of ventricular arrhythmias during hypothermia. Our aim was therefore to describe the effects of levosimendan, milrinone and isoprenaline on the action potential in human cardiomyocytes during hypothermia. METHODS Using an experimental in vitro-design, levosimendan, milrinone and isoprenaline were incubated with iCell2 hiPSC-derived cardiomyocytes and cellular action potential waveforms and contraction were recorded from monolayers of cultured cells. Experiments were conducted at temperatures from 37 °C down to 26 °C. One-way repeated measures ANOVA was performed to evaluate differences from baseline recordings and one-way ANOVA was performed to evaluate differences between drugs, untreated control and between drug concentrations at the specific temperatures. RESULTS Milrinone and isoprenaline both significantly increases action potential triangulation during hypothermia, and thereby the risk of ventricular arrhythmias. Levosimendan, however, does not increase triangulation and the contractile properties also remain preserved during hypothermia down to 26 °C. CONCLUSIONS Levosimendan remains a promising candidate drug for inotropic treatment of hypothermic patients as it possesses ability to treat hypothermia-induced cardiac dysfunction and no increased risk of ventricular arrhythmias is detected. Milrinone and isoprenaline, on the other hand, appears more dangerous in the hypothermic setting.
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Affiliation(s)
- Anders Lund Selli
- Experimental and Clinical Pharmacology, Department of Medical Biology, Faculty of Health Sciences, UiT - The Arctic University of Norway, Postboks 6050, 9037, Langnes, Tromsø, Norway
| | | | | | - Francis Burton
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, Scotland
- Clyde Biosciences, Newhouse, Scotland
| | - Godfrey Smith
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, Scotland
- Clyde Biosciences, Newhouse, Scotland
| | - Erik Sveberg Dietrichs
- Experimental and Clinical Pharmacology, Department of Medical Biology, Faculty of Health Sciences, UiT - The Arctic University of Norway, Postboks 6050, 9037, Langnes, Tromsø, Norway.
- Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway.
- Institute of Oral Biology, University of Oslo, Oslo, Norway.
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Wang X, Wei Z, Wang P, Zhou J, Feng M, Li M, Liu M, Wang J, Zhang X, Gao F, Xing C, Li J. Echocardiographic evaluation of cardiac reserve to detect subtle cardiac dysfunction in mice. Life Sci 2023; 331:122079. [PMID: 37696487 DOI: 10.1016/j.lfs.2023.122079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/23/2023] [Accepted: 09/06/2023] [Indexed: 09/13/2023]
Abstract
AIMS Cardiac reserve is a sensitive tool for early detection of cardiac dysfunction. However, cardiac reserve assessment by catecholamine stress echocardiography in mice varied in the doses of β-adrenergic agonists and the time point for measurements, which may lead to inaccurate readouts. This study aims to establish a standardized protocol for assessing cardiac reserve in mice. MAIN METHODS C57BL/6J mice under isoflurane anesthesia were intraperitoneally injected with varying doses of isoproterenol (Iso), and subjected to echocardiographic measurements. KEY FINDINGS Heart rate (HR), ejection fraction (EF), fractional shortening (FS), global longitudinal strain (GLS) and strain rate all reached peak values within 1-3 min after Iso injection at doses higher than 0.2 mg/kg. Compared with 0.1 mg/kg Iso, 0.2 mg/kg Iso resulted in higher HR, EF, FS and GLS, whereas doses higher than 0.2 mg/kg did not yield further increase. Cardiac response of female mice recapitulated main characteristics of those of male mice except that female mice displayed higher maximum HR and were more sensitive to higher doses of Iso. Furthermore, the advantages of present stress protocol over conventional baseline echocardiographic measurements were verified in comparisons of exercised vs. sedentary and aged vs. young mice for cardiac function evaluation. SIGNIFICANCE We developed a reproducible and sensitive approach to evaluate cardiac reserve by continuously monitoring cardiac function every minute for 3 min after 0.2 mg/kg Iso injection. This approach will enable detection of subtle cardiac dysfunction and accelerate innovative research in cardiac pathophysiology.
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Affiliation(s)
- Xinpei Wang
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Zihan Wei
- Department of Neurology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Panpan Wang
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Jiaheng Zhou
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Mengya Feng
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - Min Li
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Meijie Liu
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Jing Wang
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Xing Zhang
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Feng Gao
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Changyang Xing
- Department of Ultrasound Medicine, Tangdu Hospital, Fourth Military Medical University, Xi'an, China.
| | - Jia Li
- Key Laboratory of Aerospace Medicine of the Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China; Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Fourth Military Medical University, Xi'an, China.
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Chen Y, Guo X, Zeng Y, Mo X, Hong S, He H, Li J, Steinmetz R, Liu Q. Ferroptosis contributes to catecholamine-induced cardiotoxicity and pathological remodeling. Free Radic Biol Med 2023; 207:227-238. [PMID: 37499888 PMCID: PMC10529955 DOI: 10.1016/j.freeradbiomed.2023.07.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/06/2023] [Accepted: 07/24/2023] [Indexed: 07/29/2023]
Abstract
High levels of circulating catecholamines cause cardiac injury, pathological remodeling, and heart failure, but the underlying mechanisms remain elusive. Here we provide both in vitro and in vivo evidence that excessive β-adrenergic stimulation induces ferroptosis in cardiomyocytes, revealing a novel mechanism for catecholamine-induced cardiotoxicity and remodeling. We found that isoproterenol, a synthetic catecholamine, promoted glutathione depletion and glutathione peroxidase 4 (GPX4) degradation in cardiomyocytes, leading to GPX4 inactivation and enhanced lipid peroxidation. Isoproterenol also promoted heme oxygenase 1 (HO-1) expression by downregulating the transcription suppressor BTB and CNC homology 1 (Bach1), leading to increased labile iron accumulation through heme degradation. Moreover, isoproterenol markedly induced the accumulation of free iron and lipid reactive oxygen species (ROS) in the mitochondria, while targeted inhibition of iron overload and ROS accumulation within mitochondria effectively inhibited ferroptosis in cardiomyocytes. Importantly, isoproterenol administration markedly induced ferroptosis in the myocardium in vivo, associated with elevated non-heme iron accumulation driven by HO-1 upregulation. Strikingly, blockade of ferroptosis with ferrostatin-1 or inhibition of HO-1 activity with zinc protoporphyrin (ZnPP) effectively alleviated cardiac necrosis, pathological remodeling, and heart failure induced by isoproterenol administration. Taken together, our results reveal that catecholamine stimulation primarily induces ferroptotic cell death in cardiomyocyte through GPX4 and Bach1-HO-1 dependent signaling pathways. Targeting ferroptosis may represent a novel therapeutic strategy for catecholamine overload-induced myocardial injury and heart failure.
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Affiliation(s)
- Yi Chen
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Xiaoyun Guo
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Yachang Zeng
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Xiaoliang Mo
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Siqi Hong
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Hui He
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Jing Li
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Rachel Steinmetz
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA
| | - Qinghang Liu
- Department of Physiology and Biophysics, University of Washington, Seattle, WA, 98195, USA.
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George SA, Brennan-McLean JA, Trampel KA, Rytkin E, Faye NR, Knollmann BC, Efimov IR. Ryanodine receptor inhibition with acute dantrolene treatment reduces arrhythmia susceptibility in human hearts. Am J Physiol Heart Circ Physiol 2023; 325:H720-H728. [PMID: 37566110 DOI: 10.1152/ajpheart.00103.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 07/26/2023] [Accepted: 08/03/2023] [Indexed: 08/12/2023]
Abstract
Ryanodine receptor 2 (RyR2) hyperactivity is observed in structural heart diseases that are a result of ischemia or heart failure. It causes abnormal calcium handling and calcium leaks that cause metabolic, electrical, and mechanical dysfunction, which can trigger arrhythmias. Here, we tested the antiarrhythmic potential of dantrolene (RyR inhibitor) in human hearts. Human hearts not used in transplantation were obtained, and right ventricular outflow tract (RVOT) wedges and left ventricular (LV) slices were prepared. Pseudo-ECGs were recorded to determine premature ventricular contraction (PVC) incidences. Optical mapping was performed to determine arrhythmogenic substrates. After baseline optical recordings, tissues were treated with 1) isoproterenol (250 nM), 2) caffeine (200 mM), and 3) dantrolene (2 or 10 mM). Optical recordings were obtained after each treatment. Isoproterenol and caffeine treatment increased PVC incidence, whereas dantrolene reduced the PVC burden. Isoproterenol shortened action potential duration (APD) in the RV, RVOT, and LV regions and shortened calcium transient duration (CaTD) in the LV. Caffeine further shortened APD in the RV, did not modulate APD in the RVOT, and prolonged APD in the LV. In addition, in the LV, CaTD prolongation was also observed. More importantly, adding dantrolene did not alter APD in the RV or RVOT regions but produced a trend toward APD prolongation and significant CaTD prolongation in the LV, restoring these parameters to baseline values. In conclusions, dantrolene treatment suppresses triggers and reverses arrhythmogenic substrates in the human heart and could be a novel antiarrhythmic therapy in patients with structural heart disease.NEW & NOTEWORTHY Ryanodine receptor 2 hyperactivity is observed in structural heart diseases caused by ischemia or heart failure. It causes abnormal calcium leaks, which can trigger arrhythmias. To prevent arrhythmias, we applied dantrolene in human hearts ex vivo. Isoproterenol and caffeine treatment increased PVC incidence, whereas dantrolene reduced the PVC burden. Dantrolene treatment suppresses triggers and reverses arrhythmogenic substrates and could be a novel antiarrhythmic therapy in patients with structural heart disease.
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Affiliation(s)
- Sharon A George
- Department of Biomedical Engineering, George Washington University, Washington, District of Columbia, United States
- Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, United States
| | - Jaclyn A Brennan-McLean
- Department of Biomedical Engineering, George Washington University, Washington, District of Columbia, United States
| | - Katy A Trampel
- Department of Biomedical Engineering, George Washington University, Washington, District of Columbia, United States
- Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, United States
| | - Eric Rytkin
- Department of Biomedical Engineering, George Washington University, Washington, District of Columbia, United States
- Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, United States
| | - N Rokhaya Faye
- Department of Biomedical Engineering, George Washington University, Washington, District of Columbia, United States
| | - Bjorn C Knollmann
- Vanderbilt Center for Arrhythmia Research and Therapeutics, Vanderbilt University School of Medicine, Nashville, Tennessee, United States
| | - Igor R Efimov
- Department of Biomedical Engineering, George Washington University, Washington, District of Columbia, United States
- Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, United States
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Deissler PM, Tran KL, Falk V, Pieske B, Grubitzsch H, Primessnig U, Heinzel FR. Functional reserve and contractile phenotype of atrial myocardium from patients with atrial remodeling without and with atrial fibrillation. Am J Physiol Heart Circ Physiol 2023; 325:H729-H738. [PMID: 37594484 DOI: 10.1152/ajpheart.00355.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 07/26/2023] [Accepted: 08/04/2023] [Indexed: 08/19/2023]
Abstract
Atrial contractility and functional reserve in atrial remodeling (AR) without (AR/-AF) or with atrial fibrillation (AR/+AF) are not well characterized. In this study, functional measurements were performed in right atrial muscle strips (n = 71) obtained from patients (N = 22) undergoing routine cardiac surgery with either no AR [left atrial (LA) diameter < 40 mm and no history of AF (hAF)], AR/-AF (LA diameter ≥ 40 mm, no hAF), or AR/+AF (hAF and LA diameter ≥ 40 mm or LAEF < 45%). AR/-AF and AR/+AF were associated with a prolongation of half-time-to-peak (HTTP, P < 0.001) and time-to-peak (TTP) contraction (P < 0.01) when compared with no AR. This effect was seen at baseline and during β-adrenergic stimulation with isoproterenol (Iso). Early relaxation assessed by half-relaxation time (HRT) was prolonged in AR/-AF (P = 0.03) but not in AR/+AF when compared with no AR at baseline, but this delay in relaxation in AR/-AF was attenuated with Iso. Late relaxation (τ) did not differ between AR/-AF and no AR but was consistently shorter in AR/+AF than no AR before (P = 0.04) and during Iso (P = 0.01), indicating accelerated late relaxation in AR/+AF. Relative force increase during Iso was higher (P = 0.01) and more dispersed (P = 0.047) in patients with AR/+AF. Relative adrenergic response was unaltered in the myocardium of patients with AR/-AF and AR/+AF. In conclusion, AR/-AF and AR/+AF are associated with changes in myocardial inotropic reserve and contractility. The changes are particularly pronounced in patients with AR/+AF, suggesting that the progression from AR/-AF to AR/+AF is associated with progressive alterations in atrial function that may contribute to arrhythmogenesis.NEW & NOTEWORTHY Mechanical alterations in atrial remodeling without (AR/-AF) and with atrial fibrillation (AR/+AF) have not been studied in detail in human atrial tissue preparations. To our knowledge, this is the first study to compare the mechanical phenotype and inotropic reserve in human atrial myocardial preparations from patients with no atrial remodeling, AR/-AF, and AR/+AF. We identify specific patterns of contractile dysfunction and heterogeneity for both, AR/-AF and AR/+AF, indicating the progression of atrial disease.
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Affiliation(s)
- Peter M Deissler
- Department of Cardiology, Angiology and Intensive Care Medicine, Deutsches Herzzentrum der Charité, Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Berlin, Germany
- Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Khai Liem Tran
- Department of Cardiology, Angiology and Intensive Care Medicine, Deutsches Herzzentrum der Charité, Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Berlin, Germany
| | - Volkmar Falk
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Berlin, Germany
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité, Berlin, Germany
| | | | - Herko Grubitzsch
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Berlin, Germany
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité, Berlin, Germany
| | - Uwe Primessnig
- Department of Cardiology, Angiology and Intensive Care Medicine, Deutsches Herzzentrum der Charité, Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
| | - Frank R Heinzel
- Department of Cardiology, Angiology and Intensive Care Medicine, Deutsches Herzzentrum der Charité, Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
- 2. Medizinische Klinik-Kardiologie, Angiologie, Intensivmedizin, Städtisches Klinikum Dresden, Dresden, Germany
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Hagiwara A, Sato A, Kitazawa H, Aizawa Y. J Waves Augmented by Isoproterenol and Pacing. Intern Med 2023; 62:2753-2754. [PMID: 36642521 PMCID: PMC10569922 DOI: 10.2169/internalmedicine.1081-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/01/2022] [Indexed: 01/15/2023] Open
Affiliation(s)
- Akari Hagiwara
- Department of Cardiology, Tachikawa General Hospital, Japan
| | - Akinori Sato
- Department of Cardiology, Tachikawa General Hospital, Japan
| | | | - Yoshifusa Aizawa
- Devision of Research and Development, Tachikawa Medical Center, Japan
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Laasmaa M, Branovets J, Stolova J, Shen X, Rätsepso T, Balodis MJ, Grahv C, Hendrikson E, Louch WE, Birkedal R, Vendelin M. Cardiomyocytes from female compared to male mice have larger ryanodine receptor clusters and higher calcium spark frequency. J Physiol 2023; 601:4033-4052. [PMID: 37561554 DOI: 10.1113/jp284515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 07/07/2023] [Indexed: 08/11/2023] Open
Abstract
Sex differences in cardiac physiology are receiving increased attention as it has become clear that men and women have different aetiologies of cardiac disease and require different treatments. There are experimental data suggesting that male cardiomyocytes exhibit larger Ca2+ transients due to larger Ca2+ sparks and a higher excitation-contraction coupling gain; in addition, they exhibit a larger response to adrenergic stimulation with isoprenaline (ISO). Here, we studied whether there are sex differences relating to structural organization of the transverse tubular network and ryanodine receptors (RyRs). Surprisingly, we found that female cardiomyocytes exhibited a higher spark frequency in a range of spark magnitudes. While overall RyR expression and phosphorylation were the same, female cardiomyocytes had larger but fewer RyR clusters. The density of transverse t-tubules was the same, but male cardiomyocytes had more longitudinal t-tubules. The Ca2+ transients were similar in male and female cardiomyocytes under control conditions and in the presence of ISO. The synchrony of the Ca2+ transients was similar between sexes as well. Overall, our data suggest subtle sex differences in the Ca2+ influx and efflux pathways and their response to ISO, but these differences are balanced, resulting in similar Ca2+ transients in field-stimulated male and female cardiomyocytes. The higher spark frequency in female cardiomyocytes is related to the organization of RyRs into larger, but fewer clusters. KEY POINTS: During a heartbeat, the force of contraction depends on the amplitude of the calcium transient, which in turn depends on the amount of calcium released as calcium sparks through ryanodine receptors in the sarcoplasmic reticulum. Previous studies suggest that cardiomyocytes from male compared to female mice exhibit larger calcium sparks, larger sarcoplasmic reticulum calcium release and greater response to adrenergic stimulation triggering a fight-or-flight response. In contrast, we show that cardiomyocytes from female mice have a higher spark frequency during adrenergic stimulation and similar spark morphology. The higher spark frequency is related to the organization of ryanodine receptors into fewer, but larger clusters in female compared to male mouse cardiomyocytes. Despite subtle sex differences in cardiomyocyte structure and calcium fluxes, the differences are balanced, leading to similar calcium transients in cardiomyocytes from male and female mice.
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Affiliation(s)
- Martin Laasmaa
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
- Institute for Experimental Medical Research, University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Jelena Branovets
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Jekaterina Stolova
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Xin Shen
- Institute for Experimental Medical Research, University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Triinu Rätsepso
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Mihkel Jaan Balodis
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Cärolin Grahv
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Eliise Hendrikson
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - William Edward Louch
- Institute for Experimental Medical Research, University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Rikke Birkedal
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Marko Vendelin
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
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Yusifov A, Borders MO, DeHoff MA, Polson SM, Schmitt EE, Bruns DR. Juvenile physical activity protects against isoproterenol-induced cardiac dysfunction later in life. J Appl Physiol (1985) 2023; 135:572-583. [PMID: 37439235 PMCID: PMC10538985 DOI: 10.1152/japplphysiol.00010.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 07/10/2023] [Accepted: 07/10/2023] [Indexed: 07/14/2023] Open
Abstract
Cardiovascular disease is an enormous public health problem, particularly in older populations. Exercise is the most potent cardioprotective intervention identified to date, with exercise in the juvenile period potentially imparting greater protection, given the plasticity of the developing heart. To test the hypothesis that voluntary wheel running early in life would be cardioprotective later in life when risk for disease is high, we provided male and female juvenile (3 wk old) mice access to a running wheel for 2 wk. Mice then returned to a home cage to age to adulthood (4-6 mo) before exposure to isoproterenol (ISO) to induce cardiac stress. Cardiac function and remodeling were compared with sedentary control mice, sedentary mice exposed to ISO, and mice that exercised in adulthood immediately before ISO. Early in life activity protected against ISO-induced stress as evidenced by attenuated cardiac mass, myocyte size, and fibrosis compared with sedentary mice exposed to ISO. ISO-induced changes in cardiac function were ameliorated in male mice that engaged in wheel running, with ejection fraction and fractional shortening reversed to control values. Adrenergic receptor expression was downregulated in juvenile male runners. This suppression persisted in adulthood following ISO, providing a putative mechanism by which exercise in the young male heart provides resilience to cardiac stress later in life. Together, we show that activity early in life induces persistent cardiac changes that attenuate ISO-induced stress in adulthood. Identification of the mechanisms by which early in life exercise is protective will yield valuable insights into how exercise is medicine across the life course.NEW & NOTEWORTHY Voluntary wheel running activity early in life induces persistent changes in the heart that attenuate isoproterenol-induced hypertrophy and fibrosis in adulthood. Though the mechanisms of this protection remain incompletely understood, activity-induced downregulation of adrenergic receptor expression early in life may contribute to later protection against adrenergic stress. Together these data suggest that efforts to maintain an active lifestyle early in life may have long-lasting cardioprotective benefits.
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Affiliation(s)
- Aykhan Yusifov
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, United States
| | - Megan O Borders
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, United States
| | - MacKenzie A DeHoff
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, United States
| | - Sydney M Polson
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, United States
| | - Emily E Schmitt
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, United States
- WWAMI Medical Education Program, University of Wyoming, Laramie, Wyoming, United States
| | - Danielle R Bruns
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, United States
- WWAMI Medical Education Program, University of Wyoming, Laramie, Wyoming, United States
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Liu L, Sun S, Yang Z, Zhu S, Zou C. LCZ696 Ameliorates Tachycardia-Induced Cardiac Calcium Dyshomeostasis in the SERCA2α-Dependent Pathway. TOHOKU J EXP MED 2023; 260:315-327. [PMID: 37258137 DOI: 10.1620/tjem.2023.j043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The incidence, prevalence, and economic burden of heart failure have continued to increase worldwide. It remains unclear whether LCZ696 can ameliorate calcium reuptake in the sarcoplasmic reticulum via the sarcoplasmic endoplasmic reticulum calcium ion-ATPase 2α (SERCA2α)-dependent pathway during cardiac diastole. We investigated whether LCZ696 could ameliorate tachycardia-induced myocardial injury by modulating cardiac SERCA2α levels. A tachycardia-induced myocardial injury model was established by daily intraperitoneal administration of 60 mg/kg isoprenaline (ISO) for 2 weeks. LCZ696 was orally administered for the following 4 weeks. SERCA2α and calcium ion (Ca2+)-related protein expression was assessed by quantitative real-time polymerase chain reaction (qRT-PCR) and western blotting. For additional in vitro studies, HL-1 cardiomyocytes were used. A SERCA2α overexpression vector was constructed and transfected into HL-1 cells. The expression of SERCA2α and Ca2+-related proteins were also measured using qRT-PCR and western blotting. Our in vivo results demonstrated that myocardial injury was successfully induced by intraperitoneal administration of ISO. The expression of both SERCA2α- and Ca2+-related proteins was impaired. Oral administration of LCZ696 increased the expression of SERCA2α, alleviated Ca2+-related protein impairment and cardiac Ca2+ dyshomeostasis, and ameliorated myocardial injury. These results were compared with our in vitro findings. Ca2+-related proteins are affected by the overexpression of SERCA2α. LCZ696 improved tachycardia-induced myocardial injury by increasing SERCA2α expression, which reversed the development of heart failure in ISO-induced mice. These results provide new insights into how sustained LCZ696 treatment in heart failure improves cardiac function through intracellular Ca2+-regulatory mechanisms.
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Affiliation(s)
- Lan Liu
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Soochow University
- Department of Cardiology, Xishui Hospital Affiliated to Hubei University of Science and Technology
| | - Sijia Sun
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Soochow University
| | - Zhengkai Yang
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Soochow University
| | - Shasha Zhu
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Soochow University
| | - Cao Zou
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Soochow University
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Men L, Guo J, Cao Y, Huang B, Wang Q, Huo S, Wang M, Peng D, Peng L, Shi W, Li S, Lin L, Lv J. IL-6/gp130/STAT3 signaling contributed to the activation of the PERK arm of the unfolded protein response in response to chronic β-adrenergic stimulation. Free Radic Biol Med 2023; 205:163-174. [PMID: 37307935 DOI: 10.1016/j.freeradbiomed.2023.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 06/09/2023] [Indexed: 06/14/2023]
Abstract
Prolonged activation of the PERK branch of the unfolded protein response (UPR) promotes cardiomyocytes apoptosis in response to chronic β-adrenergic stimulation. STAT3 plays a critical role in β-adrenergic functions in the heart. However, whether STAT3 contributed to β-adrenoceptor-mediated PERK activation and how β-adrenergic signaling activates STAT3 remains unclear. This study aimed to investigate whether STAT3-Y705 phosphorylation contributed to the PERK arm activation in cardiomyocytes and if IL-6/gp130 signaling was involved in the chronic β-AR-stimulation-induced STAT3 and PERK arm activation. We found that the PERK phosphorylation was positively associated with STAT3 activation. Wild-type STAT3 plasmids transfection activated the PERK/eIF2α/ATF4/CHOP pathway in cardiomyocytes while dominant negative Y705F STAT3 plasmids caused no obvious effect on PERK signaling. Stimulation with isoproterenol produced a significant increase in the level of IL-6 in the cardiomyocyte's supernatants, while IL-6 silence inhibited PERK phosphorylation but failed to attenuate STAT3 activation in response to isoproterenol stimulation. Gp130 silence attenuated isoproterenol-induced STAT3 activation and PERK phosphorylation. Inhibiting IL-6/gp130 pathway by bazedoxifene and inhibiting STAT3 by stattic both reversed isoproterenol-induced STAT3-Y705 phosphorylation, ROS production, PERK activation, IRE1α activation, and cardiomyocytes apoptosis in vitro. Bazedoxifene (5 mg/kg/day by oral gavage once a day) exhibited similar effect as carvedilol (10 mg/kg/day by oral gavage once a day) on attenuating chronic isoproterenol (30 mg/kg by abdominal injection once a day, 7 days) induced cardiac systolic dysfunction, cardiac hypertrophy and fibrosis in C57BL/6 mice. Meanwhile, bazedoxifene attenuates isoproterenol-induced STAT3-Y705 phosphorylation, PERK/eIF2α/ATF4/CHOP activation, IRE1α activation, and cardiomyocytes apoptosis to a similar extend as carvedilol in the cardiac tissue of mice. Our results showed that chronic β-adrenoceptor-mediated stimulation activated the STAT3 and PERK arm of the UPR at least partially via IL-6/gp130 pathway. Bazedoxifene has great potential to be used as an alternative to conventional β-blockers to attenuate β-adrenoceptor-mediated maladaptive UPR.
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Affiliation(s)
- Lintong Men
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Junyi Guo
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Yu Cao
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bingyu Huang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qian Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shengqi Huo
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Moran Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Dewei Peng
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lulu Peng
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Shi
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Sheng Li
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Lin
- Key Laboratory of Vascular Aging, Ministry of Education, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, PR China.
| | - Jiagao Lv
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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Chan YH, Tsai FC, Chang GJ, Lai YJ, Chang SH, Chen WJ, Yeh YH. CD44 regulates Epac1-mediated β-adrenergic-receptor-induced Ca 2+-handling abnormalities: implication in cardiac arrhythmias. J Biomed Sci 2023; 30:55. [PMID: 37452346 PMCID: PMC10347873 DOI: 10.1186/s12929-023-00944-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 06/26/2023] [Indexed: 07/18/2023] Open
Abstract
BACKGROUND Sustained, chronic activation of β-adrenergic receptor (β-AR) signaling leads to cardiac arrhythmias, with exchange proteins directly activated by cAMP (Epac1 and Epac2) as key mediators. This study aimed to evaluate whether CD44, a transmembrane receptor mediating various cellular responses, participates in Epac-dependent arrhythmias. METHODS The heart tissue from CD44 knockout (CD44-/-) mice, cultured HL-1 myocytes and the tissue of human ventricle were used for western blot, co-immunoprecipitaiton and confocal studies. Line-scanning confocal imaging was used for the study of cellular Ca2+ sparks on myocytes. Optical mapping and intra-cardiac pacing were applied for arrhythmia studies on mice's hearts. RESULTS In mice, isoproterenol, a β-AR agonist, upregulated CD44 and Epac1 and increased the association between CD44 and Epac1. Isoproterenol upregulated the expression of phospho-CaMKII (p-CaMKII), phospho-ryanodine receptor (p-RyR), and phospho-phospholamban (p-PLN) in mice and cultured myocytes; these effects were attenuated in CD44-/- mice compared with wild-type controls. In vitro, isoproterenol, 8-CPT-cAMP (an Epac agonist), and osteopontin (a ligand of CD44) significantly upregulated the expression of p-CaMKII, p-RyR, and p-PLN; this effect was attenuated by CD44 small interfering RNA (siRNA). In myocytes, resting Ca2+ sparks were induced by isoproterenol and overexpressed CD44, which were prevented by inhibiting CD44. Ex vivo optical mapping and in vivo intra-cardiac pacing studies showed isoproterenol-induced triggered events and arrhythmias in ventricles were prevented in CD44-/- mice. The inducibility of ventricular arrhythmias (VAs) was attenuated in CD44-/- HF mice compared with wild-type HF controls. In patients, CD44 were upregulated, and the association between CD44 and Epac1 were increased in ventricles with reduced contractility. CONCLUSION CD44 regulates β-AR- and Epac1-mediated Ca2+-handling abnormalities and VAs. Inhibition of CD44 is effective in reducing VAs in HF, which is potentially a novel therapeutic target for preventing the arrhythmias and sudden cardiac death in patients with diseased hearts.
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Affiliation(s)
- Yi-Hsin Chan
- Cardiovascular Division, Chang-Gung Memorial Hospital, 5 Fu-Hsin Street, Guishan, Taoyuan, Taiwan
- School of Medicine, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
- School of Traditional Chinese Medicine, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Feng-Chun Tsai
- Division of Cardiovascular Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Gwo-Jyh Chang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Ying-Ju Lai
- Department of Respiratory Therapy, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Shang-Hung Chang
- Cardiovascular Division, Chang-Gung Memorial Hospital, 5 Fu-Hsin Street, Guishan, Taoyuan, Taiwan
- School of Medicine, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Wei-Jan Chen
- Cardiovascular Division, Chang-Gung Memorial Hospital, 5 Fu-Hsin Street, Guishan, Taoyuan, Taiwan
- School of Medicine, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Yung-Hsin Yeh
- Cardiovascular Division, Chang-Gung Memorial Hospital, 5 Fu-Hsin Street, Guishan, Taoyuan, Taiwan.
- School of Medicine, College of Medicine, Chang-Gung University, Taoyuan, Taiwan.
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De la Cruz F, Teed AR, Lapidus RC, Upshaw V, Schumann A, Paulus MP, Bär KJ, Khalsa SS. Central Autonomic Network Alterations in Anorexia Nervosa Following Peripheral Adrenergic Stimulation. Biol Psychiatry Cogn Neurosci Neuroimaging 2023; 8:720-730. [PMID: 37055325 PMCID: PMC10285030 DOI: 10.1016/j.bpsc.2022.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Anorexia nervosa (AN) is characterized by low body weight, disturbed eating, body image disturbance, anxiety, and interoceptive dysfunction. However, the neural processes underlying these dysfunctions in AN are unclear. This investigation combined an interoceptive pharmacological probe, the peripheral β-adrenergic agonist isoproterenol, with resting-state functional magnetic resonance imaging to examine whether individuals with AN relative to healthy comparison participants show dysregulated neural coupling in central autonomic network brain regions. METHODS Resting-state functional magnetic resonance imaging was performed in 23 weight-restored female participants with AN and 23 age- and body mass index-matched healthy comparison participants before and after receiving isoproterenol infusions. Whole-brain functional connectivity (FC) changes were examined using central autonomic network seeds in the amygdala, anterior insular cortex, posterior cingulate cortex, and ventromedial prefrontal cortex after performing physiological noise correction procedures. RESULTS Relative to healthy comparison participants, adrenergic stimulation caused widespread FC reductions in the AN group between central autonomic network regions and motor, premotor, frontal, parietal, and visual brain regions. Across both groups, these FC changes were inversely associated with trait anxiety (State-Trait Anxiety Inventory-Trait), trait depression (9-item Patient Health Questionnaire), and negative body image perception (Body Shape Questionnaire) measures, but not with changes in resting heart rate. These results were not accounted for by baseline group FC differences. CONCLUSIONS Weight-restored females with AN show a widespread state-dependent disruption of signaling between central autonomic, frontoparietal, and sensorimotor brain networks that facilitate interoceptive representation and visceromotor regulation. Additionally, trait associations between central autonomic network regions and these other brain networks suggest that dysfunctional processing of interoceptive signaling may contribute to affective and body image disturbance in AN.
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Affiliation(s)
- Feliberto De la Cruz
- Department of Psychosomatic Medicine and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Adam R Teed
- Laureate Institute for Brain Research, Tulsa, Oklahoma
| | - Rachel C Lapidus
- Laureate Institute for Brain Research, Tulsa, Oklahoma; Eating Disorders Center for Treatment and Research, University of California San Diego, San Diego, California
| | | | - Andy Schumann
- Department of Psychosomatic Medicine and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Martin P Paulus
- Laureate Institute for Brain Research, Tulsa, Oklahoma; Oxley College of Health Sciences, University of Tulsa, Tulsa, Oklahoma
| | - Karl-Jürgen Bär
- Department of Psychosomatic Medicine and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Sahib S Khalsa
- Laureate Institute for Brain Research, Tulsa, Oklahoma; Oxley College of Health Sciences, University of Tulsa, Tulsa, Oklahoma.
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49
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Ehlers TS, van der Horst J, Møller S, Piil PK, Gliemann L, Aalkjaer C, Jepps TA, Hellsten Y. Colchicine enhances β adrenoceptor-mediated vasodilation in men with essential hypertension. Br J Clin Pharmacol 2023; 89:2179-2189. [PMID: 36764326 DOI: 10.1111/bcp.15688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 12/20/2022] [Accepted: 01/05/2023] [Indexed: 02/12/2023] Open
Abstract
AIMS The aim of this study is to examine whether colchicine improves β adrenoceptor-mediated vasodilation in humans by conducting a double-blinded, placebo-controlled intervention study. Colchicine treatment has known beneficial effects on cardiovascular health and reduces the incidence of cardiovascular disease. Studies in isolated rodent arteries have shown that colchicine can enhance β adrenoceptor-mediated vasodilation, but this has not been determined in humans. METHODS Middle-aged men with essential hypertension were randomly assigned firstly to acute treatment with either 0.5 mg colchicine (n = 19) or placebo (n = 12). They were subsequently re-randomized for 3 weeks of treatment with either colchicine 0.5 mg twice daily (n = 16) or placebo (n = 15) followed by a washout period of 48-72 h. The vasodilator responses to isoprenaline, acetylcholine and sodium nitroprusside were determined as well as arterial pressure, arterial compliance and plasma inflammatory markers. RESULTS Acute colchicine treatment increased isoprenaline (by 38% for the highest dose) as well as sodium nitroprusside (by 29% main effect) -induced vasodilation but had no effect on the response to acetylcholine. The 3-week colchicine treatment followed by a washout period did not induce an accumulated or sustained effect on the β adrenoceptor response, and there was no effect on arterial pressure, arterial compliance or the level of measured inflammatory markers. CONCLUSION Colchicine acutely enhances β adrenoceptor- and nitric oxide-mediated changes in vascular conductance in humans, supporting that the mechanism previously demonstrated in rodents, translates to humans. The results provide novel translational evidence for a transient enhancing effect of colchicine on β adrenoceptor-mediated vasodilation in humans with essential hypertension. CONDENSED ABSTRACT Preclinical studies in isolated rodent arteries have shown that colchicine can enhance β adrenoceptor-mediated vasodilation. Here we show that this effect of colchicine can be translated to humans. Acute colchicine treatment was found to increase both isoprenaline- and sodium nitroprusside-induced vasodilation. The study provides the first translational evidence for a transient β adrenoceptor-mediated vasodilatory effect of colchicine in humans. The finding of an acute effect suggests that it may be clinically important to maintain an adequate bioavailability of colchicine.
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Affiliation(s)
- Thomas S Ehlers
- The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (Experimental Site), University of Copenhagen, Copenhagen, Denmark
| | - Jennifer van der Horst
- The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (Experimental Site), University of Copenhagen, Copenhagen, Denmark
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Sophie Møller
- The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (Experimental Site), University of Copenhagen, Copenhagen, Denmark
| | - Peter K Piil
- The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (Experimental Site), University of Copenhagen, Copenhagen, Denmark
| | - Lasse Gliemann
- The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (Experimental Site), University of Copenhagen, Copenhagen, Denmark
| | - Christian Aalkjaer
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Thomas A Jepps
- Vascular Biology Group, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ylva Hellsten
- The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (Experimental Site), University of Copenhagen, Copenhagen, Denmark
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50
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Cullum SA, Veprintsev DB, Hill SJ. Kinetic analysis of endogenous β 2 -adrenoceptor-mediated cAMP GloSensor™ responses in HEK293 cells. Br J Pharmacol 2023; 180:1304-1315. [PMID: 36495270 PMCID: PMC10952559 DOI: 10.1111/bph.16008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 11/01/2022] [Accepted: 12/02/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND AIM Standard pharmacological analysis of agonist activity utilises measurements of receptor-mediated responses at a set time-point, or at the peak response level, to characterise ligands. However, the occurrence of non-equilibrium conditions may dramatically impact the properties of the response being measured. Here we have analysed the initial kinetic phases of cAMP responses to β2 -adrenoceptor agonists in HEK293 cells expressing the endogenous β2 -adrenoceptor at extremely low levels. EXPERIMENTAL APPROACH The kinetics of β2 -adrenoceptor agonist-stimulated cAMP responses were monitored in real-time, in the presence and absence of antagonists, in HEK293 cells expressing the cAMP GloSensor™ biosensor. Potency (EC50 ) and efficacy (Emax ) values were determined at the peak of the agonist GloSensor™ response and compared to kinetic parameters L50 and IRmax values derived from initial response rates. KEY RESULTS The partial agonists salbutamol and salmeterol displayed reduced relative IRmax values (with respect to isoprenaline) when compared with their Emax values. Except for the fast dissociating bisoprolol, preincubation with β2 -adrenoceptor antagonists produced a large reduction in the isoprenaline peak response due to a state of hemi-equilibrium in this low receptor reserve system. This effect was exacerbated when IRmax parameters were measured. Furthermore, bisoprolol produced a large reduction in isoprenaline IRmax consistent with its short residence time. CONCLUSIONS AND IMPLICATIONS Kinetic analysis of real-time signalling data can provide valuable insights into the hemi-equilibria that can occur in low receptor reserve systems with agonist-antagonist interactions, due to incomplete dissociation of antagonist whilst the peak agonist response is developing.
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Affiliation(s)
- Sean A. Cullum
- Division of Physiology, Pharmacology and Neuroscience, School of Life SciencesUniversity of NottinghamNottinghamUK
- Centre of Membrane Proteins and ReceptorsUniversity of Birmingham and NottinghamNottinghamUK
| | - Dmitry B. Veprintsev
- Division of Physiology, Pharmacology and Neuroscience, School of Life SciencesUniversity of NottinghamNottinghamUK
- Centre of Membrane Proteins and ReceptorsUniversity of Birmingham and NottinghamNottinghamUK
| | - Stephen J. Hill
- Division of Physiology, Pharmacology and Neuroscience, School of Life SciencesUniversity of NottinghamNottinghamUK
- Centre of Membrane Proteins and ReceptorsUniversity of Birmingham and NottinghamNottinghamUK
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