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Mohran S, Kooiker K, Mahoney-Schaefer M, Mandrycky C, Kao K, Tu AY, Freeman J, Moussavi-Harami F, Geeves M, Regnier M. The biochemically defined super relaxed state of myosin-A paradox. J Biol Chem 2024; 300:105565. [PMID: 38103642 PMCID: PMC10819765 DOI: 10.1016/j.jbc.2023.105565] [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: 11/06/2023] [Accepted: 12/06/2023] [Indexed: 12/19/2023] Open
Abstract
The biochemical SRX (super-relaxed) state of myosin has been defined as a low ATPase activity state. This state can conserve energy when the myosin is not recruited for muscle contraction. The SRX state has been correlated with a structurally defined ordered (versus disordered) state of muscle thick filaments. The two states may be linked via a common interacting head motif (IHM) where the two heads of heavy meromyosin (HMM), or myosin, fold back onto each other and form additional contacts with S2 and the thick filament. Experimental observations of the SRX, IHM, and the ordered form of thick filaments, however, do not always agree, and result in a series of unresolved paradoxes. To address these paradoxes, we have reexamined the biochemical measurements of the SRX state for porcine cardiac HMM. In our hands, the commonly employed mantATP displacement assay was unable to quantify the population of the SRX state with all data fitting very well by a single exponential. We further show that mavacamten inhibits the basal ATPases of both porcine ventricle HMM and S1 (Ki, 0.32 and 1.76 μM respectively) while dATP activates HMM cooperatively without any evidence of an SRX state. A combination of our experimental observations and theories suggests that the displacement of mantATP in purified proteins is not a reliable assay to quantify the SRX population. This means that while the structurally defined IHM and ordered thick filaments clearly exist, great care must be employed when using the mantATP displacement assay.
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Affiliation(s)
- Saffie Mohran
- Department of Bioengineering, University of Washington, Seattle, Washington, USA; Center for Translational Muscle Research, University of Washington, Seattle, Washington, USA
| | - Kristina Kooiker
- Center for Translational Muscle Research, University of Washington, Seattle, Washington, USA; Division of Cardiology, University of Washington, Seattle, Washington, USA
| | | | - Christian Mandrycky
- Department of Bioengineering, University of Washington, Seattle, Washington, USA; Center for Translational Muscle Research, University of Washington, Seattle, Washington, USA
| | - Kerry Kao
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - An-Yue Tu
- Department of Bioengineering, University of Washington, Seattle, Washington, USA; Center for Translational Muscle Research, University of Washington, Seattle, Washington, USA
| | - Jeremy Freeman
- Division of Cardiology, University of Washington, Seattle, Washington, USA
| | - Farid Moussavi-Harami
- Department of Bioengineering, University of Washington, Seattle, Washington, USA; Center for Translational Muscle Research, University of Washington, Seattle, Washington, USA; Division of Cardiology, University of Washington, Seattle, Washington, USA
| | - Michael Geeves
- School of Biosciences, University of Kent, Canterbury, UK.
| | - Michael Regnier
- Department of Bioengineering, University of Washington, Seattle, Washington, USA; Center for Translational Muscle Research, University of Washington, Seattle, Washington, USA.
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2
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Cirovic A, Orisakwe OE, Cirovic A, Jevtic J, Tasic D, Tasic N. Non-Uniform Bioaccumulation of Lead and Arsenic in Two Remote Regions of the Human Heart's Left Ventricle: A Post-Mortem Study. Biomolecules 2023; 13:1232. [PMID: 37627297 PMCID: PMC10452273 DOI: 10.3390/biom13081232] [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: 07/09/2023] [Revised: 08/06/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
The extent of heavy-metal-induced cardiotoxicity is proportional to the levels of metal bioaccumulation, and it was previously assumed that heavy metals accumulate uniformly in the myocardium. Therefore, the aim of this study was to investigate concentrations of metals and metalloids in two distant regions of the left ventricle (LV), the base of the LV, and apex of the LV using inductively coupled plasma mass spectrometry (ICP-MS). We also examined the potential correlation between metal levels and the thickness of the interventricular septum in twenty LV specimens (ten from the base of LV and ten from the apex of LV) from 10 individuals (mean age 75 ± 6 years). We found significantly higher concentrations of arsenic and lead in the LV apex compared to the base of the LV. We also found a positive correlation between the concentrations of arsenic in the myocardium of LV and the thickness of the interventricular septum. Our results indicate that arsenic and lead accumulate to a higher extent in the apex of the LV compared to the base of the LV. Therefore, future studies designed to measure levels of metals in heart muscle should consider non-uniform accumulation of metals in the myocardium.
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Affiliation(s)
- Ana Cirovic
- Faculty of Medicine, Institute of Anatomy, University of Belgrade, Dr Subotica 4/2, 11000 Belgrade, Serbia;
| | - Orish E. Orisakwe
- African Centre of Excellence for Public Health and Toxicological Research (ACE-PUTOR), University of Port Harcourt, PMB, Choba, Port Harcourt 5323, Nigeria;
| | - Aleksandar Cirovic
- Faculty of Medicine, Institute of Anatomy, University of Belgrade, Dr Subotica 4/2, 11000 Belgrade, Serbia;
| | - Jovan Jevtic
- Faculty of Medicine, Institute of Pathology, University of Belgrade, Dr Subotica 1, 11000 Belgrade, Serbia;
| | - Danijela Tasic
- Institute for Cardiovascular Diseases Dedinje, 5 Heroja Milana Tepica Street, 11000 Belgrade, Serbia; (D.T.); (N.T.)
- Faculty of Medicine, University of Banja Luka, Banja Luka 74278, Bosnia and Herzegovina
| | - Nebojsa Tasic
- Institute for Cardiovascular Diseases Dedinje, 5 Heroja Milana Tepica Street, 11000 Belgrade, Serbia; (D.T.); (N.T.)
- Faculty of Medicine, University of Belgrade, Dr Subotica 8, 11000 Belgrade, Serbia
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3
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Xie SS, Deng Y, Guo SL, Li JQ, Zhou YC, Liao J, Wu DD, Lan WF. Endothelial cell ferroptosis mediates monocrotaline-induced pulmonary hypertension in rats by modulating NLRP3 inflammasome activation. Sci Rep 2022; 12:3056. [PMID: 35197507 PMCID: PMC8866506 DOI: 10.1038/s41598-022-06848-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 01/28/2022] [Indexed: 12/18/2022] Open
Abstract
Inflammation triggers pulmonary vascular remodelling. Ferroptosis, a nonapoptotic form of cell death that is triggered by iron-dependent lipid peroxidation and contributes to the pathogenesis of several inflammation-related diseases, but its role in pulmonary hypertension (PH) has not been studied. We examined endothelial cell ferroptosis in PH and the potential mechanisms. Pulmonary artery endothelial cells (PAECs) and lung tissues from monocrotaline (MCT)-induced PH rats were analysed for ferroptosis markers, including lipid peroxidation, the labile iron pool (LIP) and the protein expression of glutathione peroxidase 4 (GPX4), ferritin heavy chain 1 (FTH1) and NADPH oxidase-4 (NOX4). The effects of the ferroptosis inhibitor ferrostatin-1 (Fer-1) on endothelial cell ferroptosis and pulmonary vascular remodelling in MCT-induced rats were studied in vitro and in vivo. Ferroptosis was observed in PAECs from MCT-induced PH rats in vitro and in vivo and was characterized by a decline in cell viability accompanied by increases in the LIP and lipid peroxidation, the downregulation of GPX4 and FTH1 expression and the upregulation of NOX4 expression. High-mobility group box 1 (HMGB1)/Toll-like receptor 4 (TLR4)/NOD-like receptor family pyrin domain containing 3 (NLRP3) inflammasome signalling was measured by western blotting. These changes were significantly blocked by Fer-1 administration in vitro and in vivo. These results suggest that Fer-1 plays a role in inhibiting ferroptosis-mediated PAEC loss during the progression of PH. The ferroptosis-induced inflammatory response depended on the activation of HMGB1/TLR4 signalling, which activated the NLRP3 inflammasome in vivo. We are the first to suggest that pulmonary artery endothelial ferroptosis triggers inflammatory responses via the HMGB1/TLR4/NLRP3 inflammasome signalling pathway in MCT-induced rats. Treating PH with a ferroptosis inhibitor and exploring new treatments based on ferroptosis regulation might be promising therapeutic strategies for PH.
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Affiliation(s)
- Shan-Shan Xie
- Department of Ultrasound, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China
| | - Yan Deng
- Department of Ultrasound, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China.
- Department of Echocardiography of Cardiovascular Disease Institute, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China.
| | - Sheng-Lan Guo
- Department of Ultrasound, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China
| | - Jia-Quan Li
- Experimental Centre of Guangxi Medical University, Nanning, People's Republic of China
| | - Ying-Chuan Zhou
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China
| | - Juan Liao
- Department of Ultrasound, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China
| | - Dan-Dan Wu
- Department of Ultrasound, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China
| | - Wei-Fang Lan
- Department of Ultrasound, First Affiliated Hospital of Guangxi Medical University, 6 Shuang yong Road, Nanning, 530021, People's Republic of China
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4
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Huang W, Liu N, Tong X, Du Y. Sildenafil protects against pulmonary hypertension induced by hypoxia in neonatal rats via activation of PPARγ‑mediated downregulation of TRPC. Int J Mol Med 2022; 49:19. [PMID: 34935055 PMCID: PMC8722768 DOI: 10.3892/ijmm.2021.5074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 11/04/2021] [Indexed: 11/06/2022] Open
Abstract
Persistent pulmonary hypertension of the newborn (PPHN) is a common pulmonary vascular disease during the neonatal period, and it is associated with a high clinical mortality rate and a poor prognosis. At present, the treatment of PPHN is based mainly on inhaled nitric oxide (iNO), high‑frequency ventilation, and pulmonary vasodilators. Sildenafil has gradually begun to be used in recent years for the treatment of PPHN and has exhibited some success; however, its detailed mechanism of action requires further elucidation. An animal model of neonatal pulmonary hypertension (neonatal rats, 48 h after birth, 10% O2, 14 days) as well as a cell model [human pulmonary artery smooth muscle cells (PASMCs), 4% O2, 60 h] were established. The effects of sildenafil on pulmonary hypertension in neonatal rats were evaluated by hematoxylin and eosin staining, immunofluorescence analysis, western blotting and PCR, and the changes in peroxisome proliferator‑activated receptor γ (PPARγ), transient receptor potential canonical (TRPC)1, TRPC6 and Ki67 expression levels were detected under hypoxic conditions. The results revealed that sildenafil reversed the increases in the right ventricular mean pressure and right ventricular hypertrophy index induced by hypoxia, and attenuated pulmonary arterial remodeling as well as PASMC proliferation. The inhibitory effects of sildenafil on TRPC expression and PASMC proliferation were attenuated by GW9662 and PPARγ small interfering RNA. In conclusion, sildenafil protects against hypoxia‑induced pulmonary hypertension and right ventricular hypertrophy in neonatal rats by upregulating PPARγ expression and downregulating TRPC1 and TRPC6 expression.
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Affiliation(s)
- Wanjie Huang
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Na Liu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Xin Tong
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Yanna Du
- Department of Pediatrics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, P.R. China
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5
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Pittenger MF, Eghtesad S, Sanchez PG, Liu X, Wu Z, Chen L, Griffith BP. MSC Pretreatment for Improved Transplantation Viability Results in Improved Ventricular Function in Infarcted Hearts. Int J Mol Sci 2022; 23:694. [PMID: 35054878 PMCID: PMC8775864 DOI: 10.3390/ijms23020694] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/04/2022] [Accepted: 01/05/2022] [Indexed: 12/22/2022] Open
Abstract
Many clinical studies utilizing MSCs (mesenchymal stem cells, mesenchymal stromal cells, or multipotential stromal cells) are underway in multiple clinical settings; however, the ideal approach to prepare these cells in vitro and to deliver them to injury sites in vivo with maximal effectiveness remains a challenge. Here, pretreating MSCs with agents that block the apoptotic pathways were compared with untreated MSCs. The treatment effects were evaluated in the myocardial infarct setting following direct injection, and physiological parameters were examined at 4 weeks post-infarct in a rat permanent ligation model. The prosurvival treated MSCs were detected in the hearts in greater abundance at 1 week and 4 weeks than the untreated MSCs. The untreated MSCs improved ejection fraction in infarcted hearts from 61% to 77% and the prosurvival treated MSCs further improved ejection fraction to 83% of normal. The untreated MSCs improved fractional shortening in the infarcted heart from 52% to 68%, and the prosurvival treated MSCs further improved fractional shortening to 77% of normal. Further improvements in survival of the MSC dose seems possible. Thus, pretreating MSCs for improved in vivo survival has implications for MSC-based cardiac therapies and in other indications where improved cell survival may improve effectiveness.
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Affiliation(s)
- Mark F. Pittenger
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD 21201, USA; (S.E.); (P.G.S.); (X.L.); (Z.W.)
| | - Saman Eghtesad
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD 21201, USA; (S.E.); (P.G.S.); (X.L.); (Z.W.)
- Department of Biochemistry, School of Medicine, University of Maryland, Baltimore, MD 21201, USA
| | - Pablo G. Sanchez
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD 21201, USA; (S.E.); (P.G.S.); (X.L.); (Z.W.)
- Department of Cardiothoracic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA 15260, USA
| | - Xiaoyan Liu
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD 21201, USA; (S.E.); (P.G.S.); (X.L.); (Z.W.)
| | - Zhongjun Wu
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD 21201, USA; (S.E.); (P.G.S.); (X.L.); (Z.W.)
| | - Ling Chen
- Departments of Physiology and Medicine, School of Medicine, University of Maryland, Baltimore, MD 21201, USA;
| | - Bartley P. Griffith
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD 21201, USA; (S.E.); (P.G.S.); (X.L.); (Z.W.)
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6
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Shoji H, Yoshida Y, Sanada TJ, Naito A, Maruyama J, Zhang E, Sumi K, Sakao S, Maruyama K, Hidaka H, Tatsumi K. The Isoquinoline-Sulfonamide Compound H-1337 Attenuates SU5416/Hypoxia-Induced Pulmonary Arterial Hypertension in Rats. Cells 2021; 11:66. [PMID: 35011628 PMCID: PMC8750965 DOI: 10.3390/cells11010066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 12/11/2022] Open
Abstract
Pulmonary arterial hypertension (PAH) is characterized by elevated pulmonary arterial pressure and right heart failure. Selective pulmonary vasodilators have improved the prognosis of PAH; however, they are not able to reverse pulmonary vascular remodeling. Therefore, a search for new treatment agents is required. H-1337 is an isoquinoline-sulfonamide compound that inhibits multiple serine/threonine kinases, including Rho-associated protein kinase (ROCK) and mammalian target of rapamycin (mTOR). Here, we investigated the effects of H-1337 on pulmonary hypertension and remodeling in the pulmonary vasculature and right ventricle in experimental PAH induced by SU5416 and hypoxia exposure. H-1337 and H-1337M1 exerted inhibitory effects on ROCK and Akt. H-1337 inhibited the phosphorylation of myosin light chain and mTOR and suppressed the proliferation of smooth muscle cells in vitro. H-1337 treatment also suppressed the phosphorylation of myosin light chain and mTOR in the pulmonary vasculature and decreased right ventricular systolic pressure and the extent of occlusive pulmonary vascular lesions. Furthermore, H-1337 suppressed aggravation of right ventricle hypertrophy. In conclusion, our data demonstrated that inhibition of ROCK and mTOR pathways with H-1337 suppressed the progression of pulmonary vascular remodeling, pulmonary hypertension, and right ventricular remodeling.
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Affiliation(s)
- Hiroki Shoji
- Department of Respirology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan; (H.S.); (A.N.); (S.S.); (K.T.)
- Department of Respiratory Medicine, Tokyo Rosai Hospital, Tokyo 143-0013, Japan
| | - Yoko Yoshida
- D. Western Therapeutics Institute, Inc., Nagoya 460-0003, Japan; (Y.Y.); (K.S.); (H.H.)
- Human Research Promotion and Drug Development, Mie University, Mie 514-8507, Japan
| | - Takayuki Jujo Sanada
- Department of Respirology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan; (H.S.); (A.N.); (S.S.); (K.T.)
| | - Akira Naito
- Department of Respirology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan; (H.S.); (A.N.); (S.S.); (K.T.)
| | - Junko Maruyama
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Mie University, Mie 514-8507, Japan; (J.M.); (E.Z.); (K.M.)
- Faculty of Medical Engineering, Suzuka University of Medical Science, Mie 510-0293, Japan
| | - Erquan Zhang
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Mie University, Mie 514-8507, Japan; (J.M.); (E.Z.); (K.M.)
| | - Kengo Sumi
- D. Western Therapeutics Institute, Inc., Nagoya 460-0003, Japan; (Y.Y.); (K.S.); (H.H.)
- Human Research Promotion and Drug Development, Mie University, Mie 514-8507, Japan
| | - Seiichiro Sakao
- Department of Respirology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan; (H.S.); (A.N.); (S.S.); (K.T.)
| | - Kazuo Maruyama
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Mie University, Mie 514-8507, Japan; (J.M.); (E.Z.); (K.M.)
| | - Hiroyoshi Hidaka
- D. Western Therapeutics Institute, Inc., Nagoya 460-0003, Japan; (Y.Y.); (K.S.); (H.H.)
- Human Research Promotion and Drug Development, Mie University, Mie 514-8507, Japan
| | - Koichiro Tatsumi
- Department of Respirology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan; (H.S.); (A.N.); (S.S.); (K.T.)
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7
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Vilskersts R, Kigitovica D, Korzh S, Videja M, Vilks K, Cirule H, Skride A, Makrecka-Kuka M, Liepinsh E, Dambrova M. Protective Effects of Meldonium in Experimental Models of Cardiovascular Complications with a Potential Application in COVID-19. Int J Mol Sci 2021; 23:45. [PMID: 35008470 PMCID: PMC8744985 DOI: 10.3390/ijms23010045] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 12/14/2021] [Accepted: 12/16/2021] [Indexed: 12/18/2022] Open
Abstract
Right ventricular (RV) and left ventricular (LV) dysfunction is common in a significant number of hospitalized coronavirus disease 2019 (COVID-19) patients. This study was conducted to assess whether the improved mitochondrial bioenergetics by cardiometabolic drug meldonium can attenuate the development of ventricular dysfunction in experimental RV and LV dysfunction models, which resemble ventricular dysfunction in COVID-19 patients. Effects of meldonium were assessed in rats with pulmonary hypertension-induced RV failure and in mice with inflammation-induced LV dysfunction. Rats with RV failure showed decreased RV fractional area change (RVFAC) and hypertrophy. Treatment with meldonium attenuated the development of RV hypertrophy and increased RVFAC by 50%. Mice with inflammation-induced LV dysfunction had decreased LV ejection fraction (LVEF) by 30%. Treatment with meldonium prevented the decrease in LVEF. A decrease in the mitochondrial fatty acid oxidation with a concomitant increase in pyruvate metabolism was noted in the cardiac fibers of the rats and mice with RV and LV failure, respectively. Meldonium treatment in both models restored mitochondrial bioenergetics. The results show that meldonium treatment prevents the development of RV and LV systolic dysfunction by enhancing mitochondrial function in experimental models of ventricular dysfunction that resembles cardiovascular complications in COVID-19 patients.
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Affiliation(s)
- Reinis Vilskersts
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Rigas Stradins University, LV-1007 Riga, Latvia
| | - Dana Kigitovica
- Department of Internal Diseases, Faculty of Medicine, Rigas Stradins University, LV-1007 Riga, Latvia; (D.K.); (A.S.)
- Department of Nephrology, Pauls Stradins Clinical University Hospital, LV-1012 Riga, Latvia
| | - Stanislava Korzh
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
| | - Melita Videja
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Rigas Stradins University, LV-1007 Riga, Latvia
| | - Karlis Vilks
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
- Department of Molecular Biology, Faculty of Biology, University of Latvia, LV-1050 Riga, Latvia
| | - Helena Cirule
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
| | - Andris Skride
- Department of Internal Diseases, Faculty of Medicine, Rigas Stradins University, LV-1007 Riga, Latvia; (D.K.); (A.S.)
- Department of Rare Diseases, Pauls Stradins Clinical University Hospital, LV-1012 Riga, Latvia
| | - Marina Makrecka-Kuka
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
| | - Edgars Liepinsh
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
| | - Maija Dambrova
- Laboratory of Pharmaceutical Pharmacology, Latvian Institute of Organic Synthesis, LV-1006 Riga, Latvia; (S.K.); (M.V.); (K.V.); (H.C.); (M.M.-K.); (E.L.); (M.D.)
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Rigas Stradins University, LV-1007 Riga, Latvia
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8
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Hou N, Li LR, Shi YY, Yuan WC, Zhao GJ, Liu XW, Cai SA, Huang Y, Zhan HX, Pan WB, Luo CF. Azilsartan ameliorates ventricular hypertrophy in rats suffering from pressure overload-induced cardiac hypertrophy by activating the Keap1-Nrf2 signalling pathway. J Pharm Pharmacol 2021; 73:1715-1725. [PMID: 34343333 DOI: 10.1093/jpp/rgab097] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 06/15/2021] [Indexed: 01/15/2023]
Abstract
OBJECTIVES Investigate if azilsartan protects against myocardial hypertrophy by upregulating nuclear factor erythroid 2-related factor 2 (Nrf2)-mediated pathways. METHODS Abdominal aortic constriction (AAC)-induced cardiac hypertrophy in rats was applied. Azilsartan or vehicle was administered daily for 6 weeks in sham or AAC rats. Cardiac morphology and ventricular function were determined. Azilsartan effects upon neonatal rat cardiomyocyte (NRCM) hypertrophy and molecular mechanisms were studied in angiotensin (Ang) II-stimulated NRCMs in vitro. Nrf2-small interfering RNA (siRNA) was used to knockdown Nrf2 expression. Messenger RNA (mRNA)/protein expression of Kelch-like erythroid cell-derived protein (Keap)1 and Nrf2 and its downstream antioxidant enzymes was determined by real-time reverse transcription-quantitative polymerase chain reaction and western blotting, respectively. KEY FINDINGS Azilsartan treatment ameliorated cardiac hypertrophy/fibrosis significantly in AAC rats. Azilsartan increased expression of Nrf2 protein but decreased expression of Keap1 protein. Upregulation of protein expression of Nrf2's downstream antioxidant enzymes by azilsartan treatment was observed. Azilsartan inhibited Ang II-induced NRCM hypertrophy significantly and similar effects on the Keap1-Nrf2 pathway were observed in vivo. Nrf2 knockdown markedly counteracted the beneficial effects of azilsartan on NRCM hypertrophy and the Keap1-Nrf2 pathway. CONCLUSIONS Azilsartan restrained pressure overload-induced cardiac remodelling by activating the Keap1-Nrf2 pathway and increasing expression of downstream antioxidant enzymes to alleviate oxidative stress.
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Affiliation(s)
- Ning Hou
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Key Laboratory of Molecular Target and Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Li-Rong Li
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Tungwah Hospital of Sun Yat-sen University, Dongguan, China
| | - Yong-Ying Shi
- Department of Geriatrics, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Wen-Chang Yuan
- Key Laboratory of Molecular Target and Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Department of Clinical Laboratory, General Hospital of Xinjiang Military Region, Urumqi, China
| | - Gan-Jian Zhao
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Xia-Wen Liu
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Key Laboratory of Molecular Target and Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Shao-Ai Cai
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Yin Huang
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
- Department of Cardiology, Xiangtan Central Hospital, Xiangtan, China
| | - Hao-Xin Zhan
- Key Laboratory of Molecular Target and Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Wei-Biao Pan
- Tungwah Hospital of Sun Yat-sen University, Dongguan, China
| | - Cheng-Feng Luo
- Guangzhou Institute of Cardiovascular Disease, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
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9
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Dai Y, Chen Y, Wei G, Zha L, Li X. Ivabradine protects rats against myocardial infarction through reinforcing autophagy via inhibiting PI3K/AKT/mTOR/p70S6K pathway. Bioengineered 2021; 12:1826-1837. [PMID: 33975512 PMCID: PMC8806854 DOI: 10.1080/21655979.2021.1925008] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 04/24/2021] [Indexed: 02/07/2023] Open
Abstract
Ivabradine (Iva), a heart rate reducing agent that specifically inhibits the pacemaker I(f) ionic current, has been demonstrated to be cardioprotective in many cardiovascular diseases. Autophagy is an evolutionarily conserved metabolic process that regulates cardiac homeostasis. This study is aimed to explore whether autophagy is functionally involved in the cardioprotective effect of Iva in a rat model of myocardial infarction (MI). We observed that Iva treatment (po, 10 mg/kg/day) showed significant recovery on the hemodynamics parameters in MI rats, including left ventricular systolic pressure, left ventricular end diastolic pressure, and maximal ascending/descending rate of left ventricular pressure. Also, Iva treatment dramatically decreased infarct size, inhibited myocardial apoptosis, and reduced the levels of pro-inflammatory cytokines tumor necrosis factor (TNF)-α, interleukin (IL)-1β and IL-6 in MI rats. Moreover, Iva treatment enhanced autophagy and inhibited PI3K/AKT/mTOR/p70S6K pathway in MI rats. Simultaneously, we observed that autophagy enhancer rapamycin (ip, 10 mg/kg/day) showed similar cardioprotective effects with Iva. Furthermore, we observed that addition of autophagy inhibitor 3-methyladenine (ip, 10 mg/kg/day) counteracted the therapeutic effect of Iva, addressing that Iva attenuated post-MI cardiac injury by enhancing autophagy. In summary, these findings demonstrated that Iva attenuated MI in rats by enhancing autophagy, and PI3K/AKT/mTOR/p70S6K pathway might be involved in the process. Autophagy activation by Iva may be a potential therapeutic strategy for the treatment of MI.
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Affiliation(s)
- Yingnan Dai
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Yeping Chen
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Guoqian Wei
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Li Zha
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Xueqi Li
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
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10
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Zhang X, Li T, Cheng HJ, Wang H, Ferrario CM, Groban L, Cheng CP. Chronic GPR30 agonist therapy causes restoration of normal cardiac functional performance in a male mouse model of progressive heart failure: Insights into cellular mechanisms. Life Sci 2021; 285:119955. [PMID: 34520767 DOI: 10.1016/j.lfs.2021.119955] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 05/09/2021] [Revised: 08/21/2021] [Accepted: 09/08/2021] [Indexed: 01/22/2023]
Abstract
AIMS G protein-coupled estrogen receptor 30 (GPR30) activation by its agonist, G1, exhibits beneficial actions in female with heart failure (HF). Recent evidence indicates its cardiovascular benefits may also include male as well. However, whether and how GPR30 activation may limit HF progression and have a salutary role in males is unknown. We hypothesized that chronic G1 treatment improves LV and cardiomyocyte function, [Ca2+]i regulation and β-adrenergic reserve, thus limiting HF progression in male. MAIN METHODS We compared left ventricle (LV) and myocyte function, [Ca2+]i transient ([Ca2+]iT) and β-AR modulation in control male mice (12/group) and isoproterenol-induced HF (150 mg/kg s.c. for 2 days). Two weeks after isoproterenol injection, HF mice received placebo, or G1 (150 μg/kg/day s.c. mini-pump) for 2 weeks. KEY FINDINGS Isoproterenol-treated mice exhibited HF with preserved ejection fraction (HFpEF) at 2-weeks and progressed to HF with reduced EF (HFrEF) at 4-weeks, manifested by significantly increased LV time constant of relaxation (τ), decreased EF and mitral flow (dV/dtmax), which were accompanied by reduced myocyte contraction (dL/dtmax), relaxation (dR/dtmax) and [Ca2+]iT. Acute isoproterenol-superfusion caused significantly smaller increases in dL/dtmax, dR/dtmax and [Ca2+]iT. G1 treatment in HF increased basal and isoproterenol-stimulated increases in EF and LV contractility of EES. Importantly, G1 improved basal and isoproterenol-stimulated dL/dtmax, dR/dtmax and [Ca2+]iT to control levels and restored normal cardiac β-AR subtypes modulation. SIGNIFICANCE Chronic G1 treatment restores normal myocyte basal and β-AR-stimulated contraction, relaxation, and [Ca2+]iT, thereby reversing LV dysfunction and playing a rescue role in a male mouse model of HF.
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Affiliation(s)
- Xiaowei Zhang
- Department of Cardiology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China; Cardiovascular Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
| | - Tiankai Li
- Cardiovascular Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America; Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Heng-Jie Cheng
- Cardiovascular Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America.
| | - Hao Wang
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, United States of America.
| | - Carlos M Ferrario
- Department of Surgery, Wake Forest School of Medicine, Winston-Salem, NC, United States of America.
| | - Leanne Groban
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, United States of America.
| | - Che Ping Cheng
- Cardiovascular Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America.
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11
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Lv Y, Ma P, Wang J, Xu Q, Fan J, Yan L, Ma P, Zhou R. Betaine alleviates right ventricular failure via regulation of Rho A/ROCK signaling pathway in rats with pulmonary arterial hypertension. Eur J Pharmacol 2021; 910:174311. [PMID: 34245749 DOI: 10.1016/j.ejphar.2021.174311] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 01/12/2021] [Revised: 07/02/2021] [Accepted: 07/05/2021] [Indexed: 01/10/2023]
Abstract
Pulmonary vascular remodeling was shown to lead to pulmonary arterial hypertension (PAH), further trigger excessive apoptosis of cardiomyocytes, and ultimately cause right ventricular failure (RVF), which involves the activation of Rho A/ROCK signaling pathway. Betaine has been found efficacious for attenuating PAH through its anti-inflammatory effects in our previous research while its effects on RVF due to PAH remains inconclusive. Thus, we attempted to elucidate the protective effects of betaine on PAH, RVF due to PAH as well as the potential mechanisms. To this end, male Sprague Dawley rats received a single subcutaneous injection of monocrotaline (50 mg/kg) to imitate PAH and RVF, and subsequently oral administration of betaine (100, 200, and 400 mg/kg/day). Betaine treatment improved the hemodynamics and histomorphological parameters and echocardiographic changes. Moreover, betaine also alleviated the pulmonary vascular remodeling and cardiomyocyte apoptosis. The mechanisms study revealed that administration of betaine significantly increased the expression of Rho A, ROCK1, and ROCK2. Furthermore, betaine alleviated the changes of its downstream molecules P53, Bcl-2, Bax, phosphorylated MYPT1 (p-MYPT1), total MYPT1 (t-MYPT1), p27kip1, and Cleaved Caspase-3. According to what we observed, this study indicated that betaine treatment could protect RVF due to PAH, which may be achieved through an altered Rho A/ROCK signaling pathway.
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Affiliation(s)
- Yingjie Lv
- School of Public Health and Management, Ningxia Medical University, Yinchuan, China
| | - Pengsheng Ma
- Department of Pharmacology, College of Pharmacy, Ningxia Medical University, Yinchuan, China
| | - Jialing Wang
- Department of Pharmacology, College of Pharmacy, Ningxia Medical University, Yinchuan, China
| | - Qingbin Xu
- General Hospital of Ningxia Medical University, Yinchuan, China
| | - Jun Fan
- Shizuishan Center for Disease Control and Prevention, Shizuishan, China
| | - Lin Yan
- College of Basic Medicine, Ningxia Medical University, Yinchuan, China
| | - Ping Ma
- General Hospital of Ningxia Medical University, Yinchuan, China.
| | - Ru Zhou
- Department of Pharmacology, College of Pharmacy, Ningxia Medical University, Yinchuan, China; Key Laboratory of Hui Ethnic Medicine Modernization, Ministry of Education, Ningxia Medical University, Yinchuan, China; Ningxia Characteristic Traditional Chinese Medicine Modernization Engineering Technology Research Center, Ningxia Medical University, Yinchuan, China.
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12
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Mihm AE, Hicklin HE, Cunha AL, Nisly SA, Davis KA. Direct oral anticoagulants versus warfarin for the treatment of left ventricular thrombosis. Intern Emerg Med 2021; 16:2313-2317. [PMID: 34165680 DOI: 10.1007/s11739-021-02788-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 05/26/2021] [Accepted: 06/03/2021] [Indexed: 11/29/2022]
Affiliation(s)
- Alexandra Evaun Mihm
- Department of Pharmacy, Atrium Health, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.
| | - Harry Eugene Hicklin
- Department of Internal Medicine, Atrium Health, Wake Forest School of Medicine, Winston Salem, NC, 27157, USA
| | - Alexandra Lee Cunha
- Department of Pharmacy, Atrium Health, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
- Fred Wilson School of Pharmacy, High Point University, High Point, NC, 27268, USA
| | - Sarah Anne Nisly
- Department of Pharmacy, Atrium Health, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
- School of Pharmacy, Wingate University, Wingate, NC, 28174, USA
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13
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Laddha AP, Kulkarni YA. Daidzein mitigates myocardial injury in streptozotocin-induced diabetes in rats. Life Sci 2021; 284:119664. [PMID: 34090859 DOI: 10.1016/j.lfs.2021.119664] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 04/30/2021] [Revised: 05/20/2021] [Accepted: 05/23/2021] [Indexed: 11/17/2022]
Abstract
AIM Present study focuses on the effect of daidzein in an experimental model of diabetic cardiomyopathy in rats. MATERIALS AND METHODS Diabetes was induced in male Sprague Dawley rats by a single intraperitoneal injection of STZ at dose 55 mg/kg. Daidzein treatment was started after six weeks of diabetes induction. Animals received daidzein at a dose of 25, 50, and 100 mg/kg orally for the next four weeks. KEY FINDINGS Diabetic control animals showed significant prolongation in QT interval, PR interval, and R wave amplitude as compared to normal control animals. Treatment with daidzein at dose 100 mg/kg significantly normalized the QT interval, PR interval, and R wave amplitude. A significant reduction in QRS duration was observed in diabetic animals. Treatment with daidzein significantly improved the QRS duration after treatment. Hemodynamic parameters like systolic pressure (SBP), diastolic pressure (DBP) and mean atrial pressure (MAP) were found to be significantly decreased in diabetic animals. Treatment with daidzein at dose 100 mg/kg significantly improved the SBP, DBP, and MAP. Daidzein treatment prevented the loss of cardiac marker enzyme from heart tissue and also increased the level of AMPK and SIRT1 in plasma. Protein expression of NOX-4 and RAC-1 was also found to be reduced in cardiac tissue of daidzein treated animals. Daidzein treatment improved oxidative defense mechanism and reduced cardiac tissue necrosis and fibrosis. SIGNIFICANCE From the results, it can be concluded that daidzein mitigates the progression of diabetic cardiomyopathy by inhibiting NOX-4 induced oxidative stress in cardiac tissue.
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Affiliation(s)
- Ankit P Laddha
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V.L. Mehta Road, Vile Parle (West), Mumbai 400056, India
| | - Yogesh A Kulkarni
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V.L. Mehta Road, Vile Parle (West), Mumbai 400056, India.
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14
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Chen P, An Q, Huang Y, Zhang M, Mao S. Prevention of endotoxin-induced cardiomyopathy using sodium tanshinone IIA sulfonate: Involvement of augmented autophagy and NLRP3 inflammasome suppression. Eur J Pharmacol 2021; 909:174438. [PMID: 34437885 DOI: 10.1016/j.ejphar.2021.174438] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [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: 06/17/2021] [Revised: 08/16/2021] [Accepted: 08/17/2021] [Indexed: 11/17/2022]
Abstract
Increasing evidence indicates that patients or experimental animals exposure to endotoxin (lipopolysaccharides, LPS) exert deleterious cardiac functions that greatly contribute to morbidity and mortality. The pathophysiologic processes, including NLRP3 inflammasome overactivation and cardiac inflammatory injury, are complicated. Sodium tanshinone IIA sulfonate (STS), a water-soluble derivative of tanshinone IIA, is a naturally occurring compound extracted from Salvia miltiorrhiza and has anti-inflammatory and cardioprotective properties. In this study we examined the effect of STS on endotoxin-induced cardiomyopathy and investigated the underlying mechanisms. An endotoxemic mouse model was established by injecting LPS (10 mg/kg). Different doses of STS were administered intraperitoneally (5, 10, or 50 mg/kg) at different time points (2/12 h, 4/12 h, and 8/12 h) after LPS challenge to assess its effect on survival of mice with endotoxemia. In parallel, cardiac function, myocardial inflammatory cytokines, cardiomyocyte pyroptosis and autophagy were evaluated to determine the extent of myocardial damage due to sepsis in the presence and absence of STS at the optimal dose (10 mg/kg) and time-point (2/12 h). The results demonstrated that STS increased the survival rates, improved the compromised cardiac function and reduced myocardial inflammatory injury associated with enhanced autophagy and mitigated NLRP3 inflammasome activation. Moreover, inhibiting of autophagy or blocking the AMPK pathway reversed STS-elicited prevention of cardiomyopathy and activated the NLRP3 inflammasome in endotoxemic mice. Collectively, our study demonstrates that STS attenuates endotoxemia-induced mortality and cardiomyopathy, which may be associated with promotion of autophagy and inhibition of NLRP3 inflammasome overactivation.
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Affiliation(s)
- Peipei Chen
- Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Department of Critical Care Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510120, China
| | - Qiyuan An
- Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Department of Critical Care Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510120, China; Southern Medical University, Guangzhou, 510515, China
| | - Yuxin Huang
- Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Minzhou Zhang
- Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Department of Critical Care Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510120, China
| | - Shuai Mao
- Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Department of Critical Care Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510120, China; Guangdong Provincial Branch of National Clinical Research Centre for Chinese Medicine Cardiology, Guangzhou, 510120, China.
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15
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Fang M, Jin L, Mao W, Jin L, Cai Y, Ma Q, Liu X, Hua J, Zhu J, Fu H, Shou Q. Hirsutella sinensis fungus improves cardiac function in mouse model of heart failure. Biomed Pharmacother 2021; 142:111885. [PMID: 34385104 DOI: 10.1016/j.biopha.2021.111885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 09/27/2020] [Revised: 05/29/2021] [Accepted: 06/28/2021] [Indexed: 12/17/2022] Open
Abstract
Cordyceps sinensis, including Hirsutella sinensis, is a highly valuable traditional Chinese medicine and is used to treat patients with pulmonary heart disease in clinical practice. However, the underlying mechanisms of its effects remain unclear. In this study, a mouse model of heart failure established by non-thoracic, transverse aortic constriction (TAC) was developed to determine the underlying mechanisms of therapeutic effects of Hirsutella sinensis fungus (HSF) powder. The results showed that HSF treatment remarkably ameliorated myocardial hypertrophy, collagen fiber hyperplasia, and cardiac function in mice with heart failure. Using transcriptional and epigenetic analyses, we found that the mechanism of HSF mainly involved a variety of signaling pathways related to myocardial fibrosis and determined that HSF could reduce the levels of TGF-β1 proteins in heart tissue, as well as type I and III collagen levels. These data suggest that HSF alleviates heart failure, inhibits irreversible ventricular remodeling, and improves cardiac function through the regulation of myocardial fibrosis-related signaling pathways, which can provide novel opportunities to improve heart failure therapy.
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Affiliation(s)
- Mingsun Fang
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; Animal Experimental Research Center/Institute of Comparative Medicine, Zhejiang Chinese Medical University, Hangzhou 310053, PR China
| | - Lushuai Jin
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, PR China
| | - Wen Mao
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; School of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, PR China
| | - Lu Jin
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; Zhejiang Provincial Key Laboratory of Sexual function of Integrated Traditional Chinese and Western Medicine, Hangzhou 310053, PR China
| | - Yueqin Cai
- Animal Experimental Research Center/Institute of Comparative Medicine, Zhejiang Chinese Medical University, Hangzhou 310053, PR China
| | - Quanxin Ma
- Animal Experimental Research Center/Institute of Comparative Medicine, Zhejiang Chinese Medical University, Hangzhou 310053, PR China
| | - Xia Liu
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; Zhejiang Provincial Key Laboratory of Sexual function of Integrated Traditional Chinese and Western Medicine, Hangzhou 310053, PR China
| | - Junyi Hua
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; Zhejiang Provincial Key Laboratory of Sexual function of Integrated Traditional Chinese and Western Medicine, Hangzhou 310053, PR China
| | - Jiazhen Zhu
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, PR China.
| | - Huiying Fu
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, PR China; Zhejiang Provincial Key Laboratory of Sexual function of Integrated Traditional Chinese and Western Medicine, Hangzhou 310053, PR China.
| | - Qiyang Shou
- The Second Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Xinhua Hospital), Zhejiang Chinese Medical University, Hangzhou 310053, PR China; School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, PR China; Zhejiang Provincial Key Laboratory of Sexual function of Integrated Traditional Chinese and Western Medicine, Hangzhou 310053, PR China.
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16
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Hong MH, Na SW, Jang YJ, Yoon JJ, Lee YJ, Lee HS, Kim HY, Kang DG. Betulinic Acid Improves Cardiac-Renal Dysfunction Caused by Hypertrophy through Calcineurin-NFATc3 Signaling. Nutrients 2021; 13:3484. [PMID: 34684485 PMCID: PMC8540639 DOI: 10.3390/nu13103484] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 09/25/2021] [Accepted: 09/29/2021] [Indexed: 01/03/2023] Open
Abstract
Cardiac hypertrophy can lead to congestive heart failure and is a leading cause of morbidity and mortality worldwide. In recent years, it has been essential to find the treatment and prevention of cardiac hypertrophy. Betulinic acid (BA), the main active ingredient in many natural products, is known to have various physiological effects. However, as the potential effect of BA on cardiac hypertrophy and consequent renal dysfunction is unknown, we investigated the effect of BA on isoprenaline (ISO)-induced cardiac hypertrophy and related signaling. ISO was known to induce left ventricular hypertrophy by stimulating the β2-adrenergic receptor (β2AR). ISO was injected into Sprague Dawley rats (SD rats) by intraperitoneal injection once a day for 28 days to induce cardiac hypertrophy. From the 14th day onwards, the BA (10 or 30 mg/kg/day) and propranolol (10 mg/kg/day) were administered orally. The study was conducted in a total of 5 groups, as follows: C, control; Is, ISO (10 mg/kg/day); Pr, positive-control, ISO + propranolol (10 mg/kg/day); Bl, ISO + BA (10 mg/kg/day); Bh, ISO + BA (30 mg/kg/day). As a result, the total cardiac tissue and left ventricular tissue weights of the ISO group increased compared to the control group and were significantly reduced by BA treatment. In addition, as a result of echocardiography, the effect of BA on improving cardiac function, deteriorated by ISO, was confirmed. Cardiac hypertrophy biomarkers such as β-MHC, ANP, BNP, LDH, and CK-MB, which were increased by ISO, were significantly decreased by BA treatment. Also, the cardiac function improvement effect of BA was confirmed to improve cardiac function by inhibiting calcineurin/NFATc3 signaling. Renal dysfunction is a typical complication caused by cardiac hypertrophy. Therefore, the study of renal function indicators, creatinine clearance (Ccr) and osmolality (BUN) was aggravated by ISO treatment but was significantly restored by BA treatment. Therefore, it is thought that BA in cardiac hypertrophy can be used as valuable data to develop as a functional material effective in improving cardiac-renal dysfunction.
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Affiliation(s)
- Mi-Hyeon Hong
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan 54538, Korea
| | - Se-Won Na
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan 54538, Korea
| | - Youn-Jae Jang
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan 54538, Korea
| | - Jung-Joo Yoon
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
| | - Yun-Jung Lee
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
| | - Ho-Sub Lee
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan 54538, Korea
| | - Hye-Yoom Kim
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
| | - Dae-Gill Kang
- Hanbang Cardio-Renal Research Center, Wonkwang University, Iksan 54538, Korea; (M.-H.H.); (S.-W.N.); (Y.-J.J.); (J.-J.Y.); (Y.-J.L.); (H.-S.L.)
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan 54538, Korea
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17
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Karoor V, Strassheim D, Sullivan T, Verin A, Umapathy NS, Dempsey EC, Frank DN, Stenmark KR, Gerasimovskaya E. The Short-Chain Fatty Acid Butyrate Attenuates Pulmonary Vascular Remodeling and Inflammation in Hypoxia-Induced Pulmonary Hypertension. Int J Mol Sci 2021; 22:9916. [PMID: 34576081 PMCID: PMC8467617 DOI: 10.3390/ijms22189916] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/01/2021] [Accepted: 09/10/2021] [Indexed: 12/30/2022] Open
Abstract
Pulmonary hypertension (PH) is a progressive cardiovascular disorder in which local vascular inflammation leads to increased pulmonary vascular remodeling and ultimately to right heart failure. The HDAC inhibitor butyrate, a product of microbial fermentation, is protective in inflammatory intestinal diseases, but little is known regarding its effect on extraintestinal diseases, such as PH. In this study, we tested the hypothesis that butyrate is protective in a Sprague-Dawley (SD) rat model of hypoxic PH. Treatment with butyrate (220 mg/kg intake) prevented hypoxia-induced right ventricular hypertrophy (RVH), hypoxia-induced increases in right ventricular systolic pressure (RVSP), pulmonary vascular remodeling, and permeability. A reversal effect of butyrate (2200 mg/kg intake) was observed on elevated RVH. Butyrate treatment also increased the acetylation of histone H3, 25-34 kDa, and 34-50 kDa proteins in the total lung lysates of butyrate-treated animals. In addition, butyrate decreased hypoxia-induced accumulation of alveolar (mostly CD68+) and interstitial (CD68+ and CD163+) lung macrophages. Analysis of cytokine profiles in lung tissue lysates showed a hypoxia-induced upregulation of TIMP-1, CINC-1, and Fractalkine and downregulation of soluble ICAM (sICAM). The expression of Fractalkine and VEGFα, but not CINC-1, TIMP-1, and sICAM was downregulated by butyrate. In rat microvascular endothelial cells (RMVEC), butyrate (1 mM, 2 and 24 h) exhibited a protective effect against TNFα- and LPS-induced barrier disruption. Butyrate (1 mM, 24 h) also upregulated tight junctional proteins (occludin, cingulin, claudin-1) and increased the acetylation of histone H3 but not α-tubulin. These findings provide evidence of the protective effect of butyrate on hypoxic PH and suggest its potential use as a complementary treatment for PH and other cardiovascular diseases.
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Affiliation(s)
- Vijaya Karoor
- Department of Medicine Cardiovascular and Pulmonary Research Laboratory, University of Colorado Denver, Denver, CO 80204, USA; (V.K.); (D.S.); (T.S.); (E.C.D.); (K.R.S.)
| | - Derek Strassheim
- Department of Medicine Cardiovascular and Pulmonary Research Laboratory, University of Colorado Denver, Denver, CO 80204, USA; (V.K.); (D.S.); (T.S.); (E.C.D.); (K.R.S.)
| | - Timothy Sullivan
- Department of Medicine Cardiovascular and Pulmonary Research Laboratory, University of Colorado Denver, Denver, CO 80204, USA; (V.K.); (D.S.); (T.S.); (E.C.D.); (K.R.S.)
| | - Alexander Verin
- Vascular Biology Center, Augusta University, Augusta, GA 30912, USA; (A.V.); (N.S.U.)
| | - Nagavedi S. Umapathy
- Vascular Biology Center, Augusta University, Augusta, GA 30912, USA; (A.V.); (N.S.U.)
- Center for Blood Disorders, Augusta University, Augusta, GA 30912, USA
| | - Edward C. Dempsey
- Department of Medicine Cardiovascular and Pulmonary Research Laboratory, University of Colorado Denver, Denver, CO 80204, USA; (V.K.); (D.S.); (T.S.); (E.C.D.); (K.R.S.)
- Rocky Mountain Regional VA Center, Aurora, CO 80045, USA
| | - Daniel N. Frank
- Division of Infectious Diseases, Department of Medicine, University of Colorado Denver, Denver, CO 80204, USA;
| | - Kurt R. Stenmark
- Department of Medicine Cardiovascular and Pulmonary Research Laboratory, University of Colorado Denver, Denver, CO 80204, USA; (V.K.); (D.S.); (T.S.); (E.C.D.); (K.R.S.)
- Division of Critical Care Medicine, Department of Pediatrics, University of Colorado Denver, Denver, CO 80204, USA
| | - Evgenia Gerasimovskaya
- Department of Medicine Cardiovascular and Pulmonary Research Laboratory, University of Colorado Denver, Denver, CO 80204, USA; (V.K.); (D.S.); (T.S.); (E.C.D.); (K.R.S.)
- Division of Critical Care Medicine, Department of Pediatrics, University of Colorado Denver, Denver, CO 80204, USA
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18
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Appelt P, Gabriel P, Bölter C, Fiedler N, Schierle K, Salameh A, Rassler B. Left ventricular depression and pulmonary edema in rats after short-term normobaric hypoxia: effects of adrenergic blockade and reduced fluid load. Pflugers Arch 2021; 473:1723-1735. [PMID: 34510286 PMCID: PMC8528748 DOI: 10.1007/s00424-021-02618-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 08/13/2021] [Accepted: 08/25/2021] [Indexed: 12/25/2022]
Abstract
Acute normobaric hypoxia may induce pulmonary injury with edema (PE) and inflammation. Hypoxia is accompanied by sympathetic activation. As both acute hypoxia and high plasma catecholamine levels may elicit PE, we had originally expected that adrenergic blockade may attenuate the severity of hypoxic pulmonary injury. In particular, we investigated whether administration of drugs with reduced fluid load would be beneficial with respect to both cardiocirculatory and pulmonary functions in acute hypoxia. Rats were exposed to normobaric hypoxia (10% O2) over 1.5 or 6 h and received 0.9% NaCl or adrenergic blockers either as infusion (1 ml/h, increased fluid load) or injection (0.5 ml, reduced fluid load). Control animals were kept in normoxia and received infusions or injections of 0.9% NaCl. After 6 h of hypoxia, LV inotropic function was maintained with NaCl injection but decreased significantly with NaCl infusion. Adrenergic blockade induced a similar LV depression when fluid load was low, but did not further deteriorate LV depression after 6 h of infusion. Reduced fluid load also attenuated pulmonary injury after 6 h of hypoxia. This might be due to an effective fluid drainage into the pleural space. Adrenergic blockade could not prevent PE. In general, increased fluid load and impaired LV inotropic function promote the development of PE in acute hypoxia. The main physiologic conclusion from this study is that fluid reduction under hypoxic conditions has a protective effect on cardiopulmonary function. Consequently, appropriate fluid management has particular importance to subjects in hypoxic conditions.
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Affiliation(s)
- Peter Appelt
- Carl-Ludwig-Institute of Physiology, University of Leipzig, Leipzig, Germany
| | - Philipp Gabriel
- Carl-Ludwig-Institute of Physiology, University of Leipzig, Leipzig, Germany
| | - Christian Bölter
- Carl-Ludwig-Institute of Physiology, University of Leipzig, Leipzig, Germany
| | - Nicole Fiedler
- Carl-Ludwig-Institute of Physiology, University of Leipzig, Leipzig, Germany
| | - Katrin Schierle
- Institute of Pathology, University of Leipzig, Leipzig, Germany
| | - Aida Salameh
- Department of Pediatric Cardiology, Heart Centre, University of Leipzig, Leipzig, Germany
| | - Beate Rassler
- Carl-Ludwig-Institute of Physiology, University of Leipzig, Leipzig, Germany.
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19
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Uribe-Juárez O, Godínez R, Morales-Corona J, Velasco M, Olayo-Valles R, Acosta-García MC, Alvarado EJ, Miguel-Alavez L, Carrillo-González OJ, Flores-Sánchez MG, Olayo R. Application of plasma polymerized pyrrole nanoparticles to prevent or reduce de-differentiation of adult rat ventricular cardiomyocytes. J Mater Sci Mater Med 2021; 32:121. [PMID: 34499229 PMCID: PMC8429391 DOI: 10.1007/s10856-021-06595-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
Cardiovascular diseases are the leading cause of death in the world, cell therapies have been shown to recover cardiac function in animal models. Biomaterials used as scaffolds can solve some of the problems that cell therapies currently have, plasma polymerized pyrrole (PPPy) is a biomaterial that has been shown to promote cell adhesion and survival. The present research aimed to study PPPy nanoparticles (PPPyN) interaction with adult rat ventricular cardiomyocytes (ARVC), to explore whether PPPyN could be employed as a nanoscaffold and develop cardiac microtissues. PPPyN with a mean diameter of 330 nm were obtained, the infrared spectrum showed that some pyrrole rings are fragmented and that some fragments of the ring can be dehydrogenated during plasma synthesis, it also showed the presence of amino groups in the structure of PPPyN. PPPyN had a significant impact on the ARVC´s shape, delaying dedifferentiation, necrosis, and apoptosis processes, moreover, the cardiomyocytes formed cell aggregates up to 1.12 mm2 with some aligned cardiomyocytes and generated fibers on its surface similar to cardiac extracellular matrix. PPPyN served as a scaffold for adult ARVC. Our results indicate that PPPyN-scaffold is a biomaterial that could have potential application in cardiac cell therapy (CCT).
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Affiliation(s)
- Omar Uribe-Juárez
- Departamento de Ingeniería Eléctrica, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México.
| | - Rafael Godínez
- Departamento de Ingeniería Eléctrica, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - Juan Morales-Corona
- Departamento de Física, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - Myrian Velasco
- Departamento de Neurodesarrollo y Fisiología, División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Av. Universidad 3000, Col Ciudad Universitaria, Del. Coyoacán, C. P. 04510, Ciudad de México, México
| | - Roberto Olayo-Valles
- Departamento de Física, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - M C Acosta-García
- Departamento de Biología de la Reproducción, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - E J Alvarado
- Departamento de Ingeniería Eléctrica, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - Luis Miguel-Alavez
- Departamento de Biología de la Reproducción, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - Oscar-J Carrillo-González
- Departamento de Ingeniería Eléctrica, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
| | - María G Flores-Sánchez
- Facultad de Ingeniería, Vicerrectoría de Investigación, Universidad La Salle México, Benjamín Franklin 45, Col. Condesa, Del. Cuauhtémoc, C. P. 06140, Ciudad de México, México
| | - Roberto Olayo
- Departamento de Física, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Leyes de Reforma 1ra Secc., Del. Iztapalapa, C. P. 09340, Ciudad de México, México
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20
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Lei I, Huang W, Ward PA, Pober JS, Tellides G, Ailawadi G, Pagani FD, Landstrom AP, Wang Z, Mortensen RM, Cascalho M, Platt J, Eugene Chen Y, Lam HYK, Tang PC. Differential inflammatory responses of the native left and right ventricle associated with donor heart preservation. Physiol Rep 2021; 9:e15004. [PMID: 34435466 PMCID: PMC8387788 DOI: 10.14814/phy2.15004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 07/14/2021] [Accepted: 07/18/2021] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Dysfunction and inflammation of hearts subjected to cold ischemic preservation may differ between left and right ventricles, suggesting distinct strategies for amelioration. METHODS AND RESULTS Explanted murine hearts subjected to cold ischemia for 0, 4, or 8 h in preservation solution were assessed for function during 60 min of warm perfusion and then analyzed for cell death and inflammation by immunohistochemistry and western blotting and total RNA sequencing. Increased cold ischemic times led to greater left ventricle (LV) dysfunction compared to right ventricle (RV). The LV experienced greater cell death assessed by TUNEL+ cells and cleaved caspase-3 expression (n = 4). While IL-6 protein levels were upregulated in both LV and RV, IL-1β, TNFα, IL-10, and MyD88 were disproportionately increased in the LV. Inflammasome components (NOD-, LRR-, and pyrin domain-containing protein 3 (NLRP3), adaptor molecule apoptosis-associated speck-like protein containing a CARD (ASC), cleaved caspase-1) and products (cleaved IL-1β and gasdermin D) were also more upregulated in the LV. Pathway analysis of RNA sequencing showed increased signaling related to tumor necrosis factor, interferon, and innate immunity with ex-vivo ischemia, but no significant differences were found between the LV and RV. Human donor hearts showed comparable inflammatory responses to cold ischemia with greater LV increases of TNFα, IL-10, and inflammasomes (n = 3). CONCLUSIONS Mouse hearts subjected to cold ischemia showed time-dependent contractile dysfunction and increased cell death, inflammatory cytokine expression and inflammasome expression that are greater in the LV than RV. However, IL-6 protein elevations and altered transcriptional profiles were similar in both ventricles. Similar changes are observed in human hearts.
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Affiliation(s)
- Ienglam Lei
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | - Wei Huang
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | - Peter A. Ward
- Department of PathologyUniversity of Michigan Medical SchoolAnn ArborMichiganUSA
| | - Jordan S. Pober
- Department of ImmunobiologyYale UniversityNew HavenConnecticutUSA
| | | | - Gorav Ailawadi
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | - Francis D. Pagani
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | | | - Zhong Wang
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | - Richard M. Mortensen
- Department of Internal MedicineUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | - Marilia Cascalho
- Department of SurgeryUniversity of Michigan Medical SchoolAnn ArborMichiganUSA
| | - Jeffrey Platt
- Department of SurgeryUniversity of Michigan Medical SchoolAnn ArborMichiganUSA
| | - Yuqing Eugene Chen
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
| | | | - Paul C. Tang
- Department of Cardiac SurgeryUniversity of Michigan Frankel Cardiovascular CenterAnn ArborMichiganUSA
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21
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Sánchez-Gloria JL, Martínez-Olivares CE, Rojas-Morales P, Hernández-Pando R, Carbó R, Rubio-Gayosso I, Arellano-Buendía AS, Rada KM, Sánchez-Muñoz F, Osorio-Alonso H. Anti-Inflammatory Effect of Allicin Associated with Fibrosis in Pulmonary Arterial Hypertension. Int J Mol Sci 2021; 22:ijms22168600. [PMID: 34445305 PMCID: PMC8395330 DOI: 10.3390/ijms22168600] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/28/2021] [Accepted: 08/02/2021] [Indexed: 12/27/2022] Open
Abstract
Pulmonary arterial hypertension (PAH) is characterized by pulmonary vascular remodeling. Recent evidence supports that inflammation plays a key role in triggering and maintaining pulmonary vascular remodeling. Recent studies have shown that garlic extract has protective effects in PAH, but the precise role of allicin, a compound derived from garlic, is unknown. Thus, we used allicin to evaluate its effects on inflammation and fibrosis in PAH. Male Wistar rats were divided into three groups: control (CON), monocrotaline (60 mg/kg) (MCT), and MCT plus allicin (16 mg/kg/oral gavage) (MCT + A). Right ventricle (RV) hypertrophy and pulmonary arterial medial wall thickness were determined. IL-1β, IL-6, TNF-α, NFκB p65, Iκβ, TGF-β, and α-SMA were determined by Western blot analysis. In addition, TNF-α and TGF-β were determined by immunohistochemistry, and miR-21-5p and mRNA expressions of Cd68, Bmpr2, and Smad5 were determined by RT-qPCR. Results: Allicin prevented increases in vessel wall thickness due to TNF-α, IL-6, IL-1β, and Cd68 in the lung. In addition, TGF-β, α-SMA, and fibrosis were lower in the MCT + A group compared with the MCT group. In the RV, allicin prevented increases in TNF-α, IL-6, and TGF-β. These observations suggest that, through the modulation of proinflammatory and profibrotic markers in the lung and heart, allicin delays the progression of PAH.
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MESH Headings
- Animals
- Anti-Inflammatory Agents/therapeutic use
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, Differentiation, Myelomonocytic/genetics
- Antigens, Differentiation, Myelomonocytic/metabolism
- Bone Morphogenetic Protein Receptors, Type II/genetics
- Bone Morphogenetic Protein Receptors, Type II/metabolism
- Cytokines/genetics
- Cytokines/metabolism
- Disulfides/therapeutic use
- Fibrosis
- Heart Ventricles/drug effects
- Heart Ventricles/metabolism
- Heart Ventricles/pathology
- Hypertension, Pulmonary/drug therapy
- Male
- NF-kappa B/genetics
- NF-kappa B/metabolism
- Pulmonary Artery/drug effects
- Pulmonary Artery/metabolism
- Pulmonary Artery/pathology
- Rats
- Rats, Wistar
- Smad5 Protein/genetics
- Smad5 Protein/metabolism
- Sulfinic Acids/therapeutic use
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Affiliation(s)
- José L. Sánchez-Gloria
- Sección de Estudios de Posgrado, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 11340, Mexico; (J.L.S.-G.); (I.R.-G.)
- Departamento de Inmunología, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico;
| | - Constanza Estefanía Martínez-Olivares
- Sección de Patología Experimental, Departamento de Patología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Mexico City 14080, Mexico; (C.E.M.-O.); (R.H.-P.)
| | - Pedro Rojas-Morales
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico; (P.R.-M.); (A.S.A.-B.)
| | - Rogelio Hernández-Pando
- Sección de Patología Experimental, Departamento de Patología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Mexico City 14080, Mexico; (C.E.M.-O.); (R.H.-P.)
| | - Roxana Carbó
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico;
| | - Ivan Rubio-Gayosso
- Sección de Estudios de Posgrado, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 11340, Mexico; (J.L.S.-G.); (I.R.-G.)
| | - Abraham S. Arellano-Buendía
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico; (P.R.-M.); (A.S.A.-B.)
| | - Karla M. Rada
- Departamento de Inmunología, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico;
| | - Fausto Sánchez-Muñoz
- Sección de Estudios de Posgrado, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 11340, Mexico; (J.L.S.-G.); (I.R.-G.)
- Departamento de Inmunología, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico;
- Correspondence: (F.S.-M.); (H.O.-A.)
| | - Horacio Osorio-Alonso
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City 14080, Mexico; (P.R.-M.); (A.S.A.-B.)
- Correspondence: (F.S.-M.); (H.O.-A.)
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22
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Gilani N, Wang K, Muncan A, Peter J, An S, Bhatti S, Pandya K, Zhang Y, Tang YD, Gerdes AM, Stout RF, Ojamaa K. Triiodothyronine maintains cardiac transverse-tubule structure and function. J Mol Cell Cardiol 2021; 160:1-14. [PMID: 34175303 DOI: 10.1016/j.yjmcc.2021.06.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 08/11/2020] [Revised: 06/03/2021] [Accepted: 06/18/2021] [Indexed: 12/29/2022]
Abstract
Subclinical hypothyroidism and low T3 syndrome are commonly associated with an increased risk of cardiovascular disease (CVD) and mortality. We examined effects of T3 on T-tubule (TT) structures, Ca2+ mobilization and contractility, and clustering of dyadic proteins. Thyroid hormone (TH) deficiency was induced in adult female rats by propyl-thiouracil (PTU; 0.025%) treatment for 8 weeks. Rats were then randomized to continued PTU or triiodo-L-thyronine (T3; 10 μg/kg/d) treatment for 2 weeks (PTU + T3). After in vivo echocardiographic and hemodynamic recordings, cardiomyocytes (CM) were isolated to record Ca2+ transients and contractility. TT organization was assessed by confocal microscopy, and STORM images were captured to measure ryanodine receptor (RyR2) cluster number and size, and L-type Ca2+ channel (LTCC, Cav1.2) co-localization. Expressed genes including two integral TT proteins, junctophilin-2 (Jph-2) and bridging integrator-1 (BIN1), were analyzed in left ventricular (LV) tissues and cultured CM using qPCR and RNA sequencing. The T3 dosage used normalized serum T3, and reversed adverse effects of TH deficiency on in vivo measures of cardiac function. Recordings of isolated CM indicated that T3 increased rates of Ca2+ release and re-uptake, resulting in increased velocities of sarcomere shortening and re-lengthening. TT periodicity was significantly decreased, with reduced transverse tubules but increased longitudinal tubules in TH-deficient CMs and LV tissue, and these structures were normalized by T3 treatment. Analysis of STORM data of PTU myocytes showed decreased RyR2 cluster numbers and RyR localizations within each cluster without significant changes in Cav1.2 localizations within RyR clusters. T3 treatment normalized RyR2 cluster size and number. qPCR and RNAseq analyses of LV and cultured CM showed that Jph2 expression was T3-responsive, and its increase with treatment may explain improved TT organization and RyR-LTCC coupling.
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Affiliation(s)
- Nimra Gilani
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Kaihao Wang
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA; Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Adam Muncan
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Jerrin Peter
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Shimin An
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA; Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Simran Bhatti
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Khushbu Pandya
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Youhua Zhang
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Yi-Da Tang
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - A Martin Gerdes
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Randy F Stout
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA; NYIT Imaging Center, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
| | - Kaie Ojamaa
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd., Old Westbury, New York 11568, USA.
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23
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Goerg J, Sommerfeld M, Greiner B, Lauer D, Seckin Y, Kulikov A, Ivkin D, Kintscher U, Okovityi S, Kaschina E. Low-Dose Empagliflozin Improves Systolic Heart Function after Myocardial Infarction in Rats: Regulation of MMP9, NHE1, and SERCA2a. Int J Mol Sci 2021; 22:ijms22115437. [PMID: 34063987 PMCID: PMC8196699 DOI: 10.3390/ijms22115437] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/17/2021] [Accepted: 05/18/2021] [Indexed: 12/16/2022] Open
Abstract
The effects of the selective sodium-glucose cotransporter 2 (SGLT2) inhibitor empagliflozin in low dose on cardiac function were investigated in normoglycemic rats. Cardiac parameters were measured by intracardiac catheterization 30 min after intravenous application of empagliflozin to healthy animals. Empagliflozin increased the ventricular systolic pressure, mean pressure, and the max dP/dt (p < 0.05). Similarly, treatment with empagliflozin (1 mg/kg, p.o.) for one week increased the cardiac output, stroke volume, and fractional shortening (p < 0.05). Myocardial infarction (MI) was induced by ligation of the left coronary artery. On day 7 post MI, empagliflozin (1 mg/kg, p.o.) improved the systolic heart function as shown by the global longitudinal strain (−21.0 ± 1.1% vs. −16.6 ± 0.7% in vehicle; p < 0.05). In peri-infarct tissues, empagliflozin decreased the protein expression of matrix metalloproteinase 9 (MMP9) and favorably regulated the cardiac transporters sarco/endoplasmic reticulum Ca2+-ATPase (SERCA2a) and sodium hydrogen exchanger 1 (NHE1). In H9c2 cardiac cells, empagliflozin decreased the MMP2,9 activity and prevented apoptosis. Empagliflozin did not alter the arterial stiffness, blood pressure, markers of fibrosis, and necroptosis. Altogether, short-term treatment with low-dose empagliflozin increased the cardiac contractility in normoglycemic rats and improved the systolic heart function in the early phase after MI. These effects are attributed to a down-regulation of MMP9 and NHE1, and an up-regulation of SERCA2a. This study is of clinical importance because it suggests that a low-dose treatment option with empagliflozin may improve cardiovascular outcomes post-MI. Down-regulation of MMPs could be relevant to many remodeling processes including cancer disease.
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Affiliation(s)
- Jana Goerg
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, 10115 Berlin, Germany
| | - Manuela Sommerfeld
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, 10115 Berlin, Germany
| | - Bettina Greiner
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, 10115 Berlin, Germany
| | - Dilyara Lauer
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
| | - Yasemin Seckin
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
- Department of Biotechnology, University of Applied Science, 13353 Berlin, Germany
| | - Alexander Kulikov
- Pavlov First Saint-Petersburg State Medical University, 197022 Saint Petersburg, Russia;
| | - Dmitry Ivkin
- Saint-Petersburg State Chemical-Pharmaceutical University, 197376 Saint Petersburg, Russia; (D.I.); (S.O.)
| | - Ulrich Kintscher
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, 10115 Berlin, Germany
| | - Sergey Okovityi
- Saint-Petersburg State Chemical-Pharmaceutical University, 197376 Saint Petersburg, Russia; (D.I.); (S.O.)
| | - Elena Kaschina
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Pharmacology, Center for Cardiovascular Research (CCR), 10115 Berlin, Germany; (J.G.); (M.S.); (B.G.); (D.L.); (Y.S.); (U.K.)
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, 10115 Berlin, Germany
- Correspondence: ; Tel.: +49-30-450-525-024
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Grujić-Milanović J, Jaćević V, Miloradović Z, Jovović D, Milosavljević I, Milanović SD, Mihailović-Stanojević N. Resveratrol Protects Cardiac Tissue in Experimental Malignant Hypertension Due to Antioxidant, Anti-Inflammatory, and Anti-Apoptotic Properties. Int J Mol Sci 2021; 22:5006. [PMID: 34066865 PMCID: PMC8125904 DOI: 10.3390/ijms22095006] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/28/2021] [Accepted: 04/28/2021] [Indexed: 12/25/2022] Open
Abstract
Hypertension is one of the most prevalent and powerful contributors of cardiovascular diseases. Malignant hypertension is a relatively rare but extremely severe form of hypertension accompanied with heart, brain, and renal impairment. Resveratrol, a recently described grape-derived, polyphenolic antioxidant molecule, has been proposed as an effective agent in the prevention of cardiovascular diseases. This study was designed to examine chronic resveratrol administration on blood pressure, oxidative stress, and inflammation, with special emphasis on cardiac structure and function in two models of experimental hypertension. The experiments were performed in spontaneously (SHRs) and malignantly hypertensive rats (MHRs). The chronic administration of resveratrol significantly decreased blood pressure in both spontaneously and malignant hypertensive animals. The resveratrol treatment ameliorated morphological changes in the heart tissue. The immunohistochemistry of the heart tissue after resveratrol treatment showed that both TGF-β and Bax were not present in the myocytes of SHRs and were present mainly in the myocytes of MHRs. Resveratrol suppressed lipid peroxidation and significantly improved oxidative status and release of NO. These results suggest that resveratrol prevents hypertrophic and apoptotic consequences induced by high blood pressure with more pronounced effects in malignant hypertension.
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Affiliation(s)
- Jelica Grujić-Milanović
- Laboratory for Experimental Hypertension, Institute for Medical Research, Department for Cardiovascular Research, University of Belgrade, National Institute of the Republic Serbia, 11000 Belgrade, Serbia; (Z.M.); (D.J.); (N.M.-S.)
| | - Vesna Jaćević
- Department for Experimental Toxicology and Pharmacology, National Poison Control Centre, Military Medical Academy, 11000 Belgrade, Serbia;
- Medical Faculty of the Military Medical Academy, University of Defence, 11000 Belgrade, Serbia
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 500 30 Hradec Kralove, Czech Republic
| | - Zoran Miloradović
- Laboratory for Experimental Hypertension, Institute for Medical Research, Department for Cardiovascular Research, University of Belgrade, National Institute of the Republic Serbia, 11000 Belgrade, Serbia; (Z.M.); (D.J.); (N.M.-S.)
| | - Djurdjica Jovović
- Laboratory for Experimental Hypertension, Institute for Medical Research, Department for Cardiovascular Research, University of Belgrade, National Institute of the Republic Serbia, 11000 Belgrade, Serbia; (Z.M.); (D.J.); (N.M.-S.)
| | - Ivica Milosavljević
- Institute of Pathology and Forensic Medicine, Military Medical Academy, 11000 Belgrade, Serbia;
| | - Sladjan D. Milanović
- Institute for Medical Research, Department for Biomedical Engineering and Biophysics, University of Belgrade, National Institute of the Republic Serbia, 11000 Belgrade, Serbia;
| | - Nevena Mihailović-Stanojević
- Laboratory for Experimental Hypertension, Institute for Medical Research, Department for Cardiovascular Research, University of Belgrade, National Institute of the Republic Serbia, 11000 Belgrade, Serbia; (Z.M.); (D.J.); (N.M.-S.)
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Park BM, Li W, Kim SH. Cardio-protective effects of angiotensin-(1-5) via mas receptor in rats against ischemic-perfusion injury. Peptides 2021; 139:170516. [PMID: 33582209 DOI: 10.1016/j.peptides.2021.170516] [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: 12/08/2020] [Revised: 02/04/2021] [Accepted: 02/07/2021] [Indexed: 11/28/2022]
Abstract
Angiotensin-(1-5) [Ang-(1-5)], which is a metabolite of Ang-(1-7) catalyzed by angiotensin-converting enzyme, is a novel pentapeptide of the renin-angiotensin system. Ang-(1-7), Ang III and Ang IV have a cardio-protective effect via Mas receptor, Ang II type 2 receptor (AT2R) and AT4R, respectively. However, it is not clear whether Ang-(1-5) has cardio-protective effects. The aim of this study is to investigate whether Ang-(1-5) protects the heart against ischemia-reperfusion (I/R) injury. After sacrificing Sprague-Dawley rats, the hearts were perfused with Krebs-Henseleit buffer for a 20 min pre-ischemic period with and without Ang-(1-5) followed by 20 min global ischemia and 50 min reperfusion. Ang-(1-5) (1 μM) improved changes in post-ischemic left ventricular developed pressure (LVDP), ±dP/dt, and post-ischemic left ventricular end-diastolic pressure (LVEDP) induced by reperfusion compared to control hearts. Ang-(1-5) decreased myocardial infarct size and LDH activity, and increased coronary flow and the amount of atrial natriuretic peptide (ANP) in coronary effluent during reperfusion compared to control hearts. Pretreatment with Mas receptor antagonist but not with AT1R or AT2R antagonist attenuated the improvement of changes in I/R-induced ventricular hemodynamics by Ang-(1-5). Ang-(1-5) treatment decreased Bax, caspase-3 and caspase-9 protein levels, and increased Bcl-2 protein level, which were attenuated by A779 pretreatment. Ang-(1-5) treatment increased Mn-superoxide dismutase, catalase, and heme oxygenase-1 protein levels, which was attenuated by A779 pretreatment. These results suggest that the cardio-protective effects of Ang-(1-5) against I/R injury may be partly related to activating anti-oxidant and anti-apoptotic enzymes via Mas receptor.
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Affiliation(s)
- Byung Mun Park
- Department of Physiology, Research Institute for Endocrine Sciences, Jeonbuk National University Medical School, 20 Geonji-ro, Deokjin-gu, Jeonju, Jeollabuk-do 54907, Republic of Korea
| | - Weijian Li
- Department of Physiology, Research Institute for Endocrine Sciences, Jeonbuk National University Medical School, 20 Geonji-ro, Deokjin-gu, Jeonju, Jeollabuk-do 54907, Republic of Korea
| | - Suhn Hee Kim
- Department of Physiology, Research Institute for Endocrine Sciences, Jeonbuk National University Medical School, 20 Geonji-ro, Deokjin-gu, Jeonju, Jeollabuk-do 54907, Republic of Korea.
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Harada E, Sugino K, Aimoto M, Takahara A. Effects of the L/N-Type Ca 2+ Channel Blocker Cilnidipine on the Cardiac Histological Remodelling and Inducibility of Atrial Fibrillation in High-Salt-Fed Rats. Biol Pharm Bull 2021; 44:707-713. [PMID: 33642455 DOI: 10.1248/bpb.b21-00024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/22/2022]
Abstract
High salt intake has been shown to induce hypertrophy and fibrosis in the atria and ventricles, which could result in the development of atrial fibrillation (AF). Whereas the development of AF is suggested to be prevented by renin-angiotensin system (RAS) inhibitors, recent findings have indicated that this prevention is closely associated with their antihypertensive effects. In this study, we investigated whether the L/N-type Ca2+ channel blocker cilnidipine counteracts salt-induced atrial and ventricular remodelling and the inducibility of AF. Cilnidipine was orally administered to Dahl salt-sensitive rats fed with an 8% NaCl diet at 10 mg/kg for 5 weeks, and then electrophysiological evaluation and histological analyses were performed. The effects were compared with those of the L-type Ca2+ channel blocker amlodipine at 3 mg/kg. Following the intake of the 8% NaCl diet, the blood pressure (BP) increased, and fibrosis was induced in the atria and ventricles. Cilnidipine decreased BP, and the extent of the decrease in the cilnidipine group was similar to those in the amlodipine group. Cilnidipine produced a greater decrease in the fibrotic area in the atria and ventricles than amlodipine. The cilnidipine group shortened the AF duration from 7.43 ± 3.16 to 2.95 ± 1.73 s, which had been increased by NaCl intake. Plasma noradrenaline levels in the cilnidipine group were lower than those in the amlodipine group. Thus, the suppressive effects of cilnidipine on the salt-induced atrial and ventricular remodelling, fibrosis, and AF sustainability might be closely associated with its N-type Ca2+ channel-blocking actions.
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Affiliation(s)
- Eri Harada
- Ajinomoto Pharmaceuticals Co., Ltd
- Ajinomoto Co., Inc
| | - Kazumi Sugino
- Ajinomoto Pharmaceuticals Co., Ltd
- Ajinomoto Co., Inc
| | - Megumi Aimoto
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
| | - Akira Takahara
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
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Sandhu P, Ong JP, Garg V, Altaha M, Bello O, Singal SR, Verma S, Yan AT, Connelly KA. The effects of saxagliptin on cardiac structure and function using cardiac MRI (SCARF). Acta Diabetol 2021; 58:633-641. [PMID: 33483855 DOI: 10.1007/s00592-020-01661-y] [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: 10/01/2020] [Accepted: 12/17/2020] [Indexed: 10/22/2022]
Abstract
PURPOSE A recent large cardiovascular outcome trial in patients with type 2 diabetes (T2DM) demonstrated excess heart failure hospitalization with saxagliptin. We sought to evaluate the impact of saxagliptin on cardiac structure and function using cardiac magnetic resonance imaging (CMR) in patients with T2DM without pre-existing heart failure. METHODS In this prospective study, patients with T2DM without heart failure were prescribed saxagliptin as part of routine guideline-directed management. Clinical assessment, CMR imaging and biomarkers were assessed in a blinded fashion and compared following 6 months of continued treatment. The primary outcome was the change in left ventricular (LV) ejection fraction (LVEF) after 6 months of therapy. Key secondary outcomes included changes in LV and right ventricular (RV) end-diastolic volume, ventricular mass, LV global strain and cardiac biomarkers [N terminal pro B-type natriuretic peptide (NT-proBNP) and high sensitivity C-reactive protein (hsCRP)] over 6 months. RESULTS The cohort (n = 16) had a mean age of 59.9 years with 69% being male. The mean hemoglobin A1c (HbA1c) was 8.3%. Mean baseline LVEF was 57% ± 3.4, with no significant change over 6 months (- 0.2%, 95% CI - 2.5, 2.1, p = 0.86). Detailed CMR analyses that included LV/RV volumes, LV mass, and feature tracking-derived strain showed no significant change (all p > 0.50). NT-proBNP and hsCRP levels did not significantly change (p > 0.20). CONCLUSIONS In this cohort of stable ambulatory patients with T2DM without heart failure, saxagliptin treatment was not associated with adverse ventricular remodeling over 6 months as assessed using CMR and biomarkers.
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Affiliation(s)
- Paul Sandhu
- Division of Cardiology, Queen's University, Kingston, ON, Canada
| | - Jann P Ong
- Division of Cardiology, University of Toronto, Toronto, ON, Canada
| | - Vinay Garg
- Division of Cardiology, University of Toronto, Toronto, ON, Canada
| | - Mustafa Altaha
- Division of Cardiology, University of Toronto, Toronto, ON, Canada
| | - Olubenga Bello
- Division of Cardiology, University of Toronto, Toronto, ON, Canada
| | - Sewa R Singal
- Department of Medicine, Humber River Hospital, Toronto, ON, Canada
- Department of Medicine, Queen's University, Kingston, ON, Canada
| | - Subodh Verma
- Division of Cardiac Surgery, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
- Department of Physiology, University of Toronto, Toronto, ON, Canada
| | - Andrew T Yan
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, 193 Yonge St, Toronto, ON, M5B1M8, Canada
- Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - Kim A Connelly
- Department of Physiology, University of Toronto, Toronto, ON, Canada.
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, 193 Yonge St, Toronto, ON, M5B1M8, Canada.
- Department of Medicine, University of Toronto, Toronto, ON, Canada.
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Zhai Z, Qin W, Wang Z, Dong S, Guo X, Zhang C, Wang Z, Lu G, Huang L. Changes in left ventricular function induced by carboplatin combined with paclitaxel in patients with ovarian cancer identified using three-dimensional spot tracking imaging technology. J Clin Ultrasound 2021; 49:378-384. [PMID: 33372283 DOI: 10.1002/jcu.22941] [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] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/30/2020] [Accepted: 10/15/2020] [Indexed: 06/12/2023]
Abstract
OBJECTIVE To investigate the clinical value of three-dimensional speckle tracking imaging (3D-STI) in evaluating left ventricular (LV) systolic function in patients with ovarian cancer (OC) treated with paclitaxel and carboplatin. METHOD We studied 30 patients with OC treated with paclitaxel combined with carboplatin chemotherapy. Two-dimensional echocardiography and 3D-STI were performed in the patients before they underwent 2- and 6-cycle chemotherapies, and in 30 normal control subjects. Were measured LV end-diastolic volume (EDV), end-systolic volume (ESV), three-dimensional LV ejection fraction (3D-LVEF), stroke volume (SV), spherical index (SPI), LV end-diastolic mass (LV EDmass), LV end-systolic mass (LV ESmass), LV global longitudinal strain (GLS), global circumferential strain (GCS), global radial strain (GRS), global area strain (GAS) and cardiac troponin T(cTnT). At the end of chemotherapy, magnetic resonance imaging (MRI) was also performed. RESULT The 3D conventional strain values (3D-LVEF, SV, LV EDV) after the 2- and 6-cycle chemotherapy were lower than before chemotherapy. LV Edmass, LV ESmass and cTnT were higher while LV GLS, GCS, GRS, GAS were lower after 2- and after 6-cycle chemotherapy than before chemotherapy. There was no significant difference in ESV and EDV between the 3D-STI and MRI parameters. GAS showed a significant negative correlation with cTnT. MRI and 3D-STI variables were significantly correlated, and the receiver operating characteristic curves showed the greater area under the curve for GAS after 2- and after 6-cycle chemotherapy. After 2-cycle chemotherapy, the highest specificity for GAS was 93.3%, and the highest sensitivity for GLS was 70.0%. After 6-cycle chemotherapy, the highest specificity for GAS was 96.7%, and the highest sensitivity for GLS was 96.7%. CONCLUSION The LV systolic function decreased in OC patients treated with paclitaxel and carboplatin, showing that 3D-STI may detect early LV systolic dysfunction.
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Affiliation(s)
- Zijing Zhai
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Wenjuan Qin
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Zhen Wang
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Shanshan Dong
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Xueting Guo
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Caiyun Zhang
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Zhong Wang
- Department of Cardiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Guilin Lu
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
| | - Lei Huang
- Medical College of Shihezi University, Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China
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Imano H, Kato R, Nomura A, Tamura M, Yamaguchi Y, Ijiri Y, Wu H, Nakano T, Okada Y, Yamaguchi T, Izumi Y, Yoshiyama M, Asahi M, Hayashi T. Rivaroxaban Attenuates Right Ventricular Remodeling in Rats with Pulmonary Arterial Hypertension. Biol Pharm Bull 2021; 44:669-677. [PMID: 33612567 DOI: 10.1248/bpb.b20-01011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/22/2022]
Abstract
Pulmonary arterial hypertension (PAH) is a progressive condition that frequently results in right ventricular (RV) remodeling. The objectives of this study are to investigate effects of rivaroxaban on RV remodeling in a rat model of PAH, created with Sugen5416 and chronic hypoxia, and the in vitro effects of rivaroxaban on human cardiac microvascular endothelial cells (HCMECs). To create the PAH model, male Sprague-Dawley rats were subcutaneously injected with Sugen5416 (20 mg/kg) and exposed to 2 weeks of hypoxia (10% O2), followed by 2 weeks of exposure to normoxia. The animals were then divided into 2 groups with or without administration of rivaroxaban (12 mg/kg/d) for a further 4 weeks. HCMECs were cultured under hypoxic conditions (37 °C, 1% O2, 5% CO2) with Sugen5416 and with or without rivaroxaban. In the model rats, RV systolic pressure and Fulton index increased by hypoxia with Sugen5416 were significantly decreased when treated with rivaroxaban. In HCMECs, hypoxia with Sugen5416 increased the expression of protease-activated receptor-2 (PAR-2) and the phosphorylation of extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and nuclear factor-kappa B (NF-κB), while treatment with rivaroxaban significantly suppressed the expression of these proteins. Rivaroxaban attenuated RV remodeling in a rat model of PAH by reducing ERK, JNK and NF-κB activation. Rivaroxaban has the possibility of providing additive effects on RV remodeling in patients with PAH.
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Affiliation(s)
- Hideki Imano
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
| | - Ryuji Kato
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
| | - Atsuo Nomura
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
- Department of Pharmacology, Faculty of Medicine, Osaka Medical College
| | - Maki Tamura
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
| | - Yudai Yamaguchi
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
| | - Yoshio Ijiri
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
| | - Hong Wu
- Department of Microbiology and Infection Control, Faculty of Medicine, Osaka Medical College
| | - Takashi Nakano
- Department of Microbiology and Infection Control, Faculty of Medicine, Osaka Medical College
| | - Yoshikatsu Okada
- Department of Pathology, Faculty of Medicine, Osaka Medical College
| | - Takehiro Yamaguchi
- Department of Pharmacology, Osaka City University Graduate School of Medicine
| | - Yasukatsu Izumi
- Department of Pharmacology, Osaka City University Graduate School of Medicine
| | - Minoru Yoshiyama
- Department of Cardiovascular Medicine, Osaka City University Graduate School of Medicine
| | - Michio Asahi
- Department of Pharmacology, Faculty of Medicine, Osaka Medical College
| | - Tetsuya Hayashi
- Department of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences
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Wu X, Wei M, Zhang H, Fan X, Ma X, Liu J, Xue M. The Protective Effect of Aspirin against Myocardial Hypertrophy in Rats. Biomed Res Int 2021; 2021:2043415. [PMID: 33969115 PMCID: PMC8081624 DOI: 10.1155/2021/2043415] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 02/01/2021] [Accepted: 03/20/2021] [Indexed: 11/22/2022]
Abstract
The protective effect of aspirin against myocardial hypertrophy (MH) was studied. Model rats of pressure overload MH were prepared by abdominal aortic coarctation. Rats were randomly divided into the sham group (n = 9), MH model group (n = 9), and MH+aspirin group (n = 9), which was, respectively, divided into the 4-week group and 8-week group according to the time of intragastric administration. Arterial blood pressure and left ventricular mass index (LVMI) were measured. Changes in myocardial tissue structure were observed by HE staining, Masson staining, and reticular fiber staining. Cardiomyocyte apoptosis was detected by TUNEL assay. The levels of TNF-α, IL-10, TXA2, and PGI2 in myocardium and plasma were detected by ELISA. The arterial blood pressure in the MH model group was significantly higher than that in the 4- and 8-week sham groups, but that in the MH+aspirin group was significantly lower than that in the MH model group. At 4 and 8 weeks, the LVWI in the MH model group was significantly higher than that in the sham group, but it was significantly reduced after aspirin treatment. The myocardial cell hypertrophy was obvious, collagen fibers were proliferated, and reticular fibers were reduced in the 4- and 8-week MH model groups. Compared with the MH model groups, myocardial cells in the MH+aspirin groups were significantly reduced, the collagen fiber content was significantly reduced, and the reticular fiber content was increased. The apoptotic cardiomyocytes in the 4- and 8-week MH model groups were obviously increased. The apoptosis of myocardial cells in the MH+aspirin groups was obviously decreased. The TNF-α levels in the myocardial tissue of the 4- and 8-week MH model groups were significantly increased, while those of the MH+aspirin groups were significantly decreased. There was no significant change in the IL-10 level or PGI2 level at 4 weeks. At 8 weeks, the PGI2 level was significantly decreased in the MH model group while significantly increased in the MH+aspirin group. The TXA2 levels were significantly increased in the 4- and 8-week MH model groups and those in the 4- and 8-week MH+aspirin groups were significantly lower. Aspirin has an anti-inflammatory effect, can effectively reduce the expression of inflammatory factors, inhibit myocardial apoptosis, and has a certain protective effect against MH.
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Affiliation(s)
- Xiaolong Wu
- Department of Physiology, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
- Department of Laboratory, Baotou Central Hospital, Baotou city, Inner Mongolia 014040, China
| | - Minghui Wei
- Department of Physiology, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
| | - Haifeng Zhang
- School of Basic Sciences, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
| | - Xiaomei Fan
- Department of Physiology, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
| | - Xiaochen Ma
- Department of Physiology, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
| | - Jiaming Liu
- Department of Physiology, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
| | - Mingming Xue
- Department of Physiology, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010110, China
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Beik A, Najafipour H, Joukar S, Rajabi S, Iranpour M, Kordestani Z. Perillyl alcohol suppresses monocrotaline-induced pulmonary arterial hypertension in rats via anti-remodeling, anti-oxidant, and anti-inflammatory effects. Clin Exp Hypertens 2021; 43:270-280. [PMID: 33322932 DOI: 10.1080/10641963.2020.1860080] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 10/21/2020] [Accepted: 11/06/2020] [Indexed: 10/22/2022]
Abstract
Background: Pulmonary arterial hypertension (PAH) is a disastrous disease that current treatments cannot prevent its progression. The present study investigated the effects of perillyl alcohol (PA), a natural monoterpene, on the experimental PAH in male Wistar rats. Methods: Rats divided into eight groups of control, Monocrotaline (MCT), MCT+vehicle, and MCT+PA with doses of 20, 30, 40, 50, and 60 mg/kg. PAH was induced by a single injection of monocrotaline (60 mg/kg) on day 0. The animals in the groups of MCT+vehicle and MCT+PA received the vehicle or PA from day 22 to 42 once a day. On day 43, under general anesthesia, right ventricular systolic pressure (RVSP), as an index of pulmonary artery systolic pressure, and the ratio of the right ventricle to the left ventricle plus septum weight, as the right ventricular hypertrophy index (RVHI), were measured. Also, some histological and biochemical indices were assessed in the lung tissue. Results: MCT significantly (p < .001) enhanced the RVSP and RVHI compared to the control group (89.4 ± 8.2 vs 23 ± 3.3 mmHg & 0.63 ± 0.08 vs 0.26 ± 0.04 respectively). It also increased oxidative stress and inflammatory cytokines and reduced Bax/Bcl2 ratio. Treatment with PA significantly recovered RVSP and hypertrophy index and suppressed vascular cell proliferation, oxidant production, and inflammatory processes. Conclusion: PA exerted noticeable protective and curative effects against MCT-induced PAH and pulmonary vascular remodeling through inhibiting cellular proliferation, oxidative stress, and inflammation. Therefore, PA can be considered as a new therapeutic goal for the treatment of PAH.
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Affiliation(s)
- Ahmad Beik
- Department of Physiology and Pharmacology, Afzalipour Medical Faculty, and Physiology Research Center, Kerman University of Medical Sciences , Kerman, Iran
| | - Hamid Najafipour
- Cardiovascular Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Science , Kerman, Iran
| | - Siyavash Joukar
- Cardiovascular Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Science , Kerman, Iran
| | - Soodeh Rajabi
- Department of Physiology and Pharmacology, Afzalipour Medical Faculty, and Physiology Research Center, Kerman University of Medical Sciences , Kerman, Iran
| | - Maryam Iranpour
- Pathology and Stem Cell Research Center, Kerman University of Medical Sciences , Kerman, Iran
| | - Zeinab Kordestani
- Endocrinology and Metabolism Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences , Kerman, Iran
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Gao J, Yuan G, Xu Z, Lan L, Xin W. Chenodeoxycholic and deoxycholic acids induced positive inotropic and negative chronotropic effects on rat heart. Naunyn Schmiedebergs Arch Pharmacol 2021; 394:765-773. [PMID: 32808070 DOI: 10.1007/s00210-020-01962-7] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 08/06/2020] [Indexed: 12/25/2022]
Abstract
Bile acids are endogenous amphiphilic steroids from the metabolites of cholesterol. Studies showed that they might contribute to the pathogenesis of cardiopathy in cholestatic liver diseases. Chenodeoxycholic acid (CDCA) and deoxycholic acid (DCA) is associated with colon cancer, gallstones, and gastrointestinal disorders. However, little information is available regarding their cardiac effects. Here, we reported that CDCA (100 μM) and DCA (100 μM) significantly increased the left ventricular developed pressure of the isolated rat hearts to 122.3 ± 5.6% and 145.1 ± 13.7%, and the maximal rate of the pressure development rising and descending (± dP/dtmax) to 103.4 ± 17.6% and 124.4 ± 37.7% of the basal levels, respectively. They decreased the heart rate and prolonged the RR, QRS, and QT intervals of Langendorff-perfused hearts in a concentration-dependent manner. Moreover, CDCA and DCA increased the developed tension of left ventricular muscle and the cytosolic Ca2+ concentrations in left ventricular myocytes; these functions positively coordinated with their inotropic effects on hearts. Additionally, CDCA (150 μM) and DCA (100 μM) decreased the sinoatrial node beating rate to 80.6 ± 3.0% and 79.7 ± 0.9% of the basal rate (334.2 ± 10.7 bpm), respectively. These results were consistent with their chronotropic effects. In conclusion, CDCA and DCA induced positive inotropic effects by elevating the Ca2+ in left ventricular myocytes. They exerted negative chronotropic effects by lowering the pace of the sinoatrial node in rat heart. These results indicated that the potential role of bile acids in cardiopathy related to cholestasis.
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Affiliation(s)
- Jie Gao
- College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, 2 Tiansheng Road, Beibei, Chongqing, 400715, China
| | - Guanyin Yuan
- College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, 2 Tiansheng Road, Beibei, Chongqing, 400715, China
| | - Zhan Xu
- College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, 2 Tiansheng Road, Beibei, Chongqing, 400715, China
| | - Luyao Lan
- College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, 2 Tiansheng Road, Beibei, Chongqing, 400715, China
| | - Wenkuan Xin
- College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, 2 Tiansheng Road, Beibei, Chongqing, 400715, China.
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Reader RC, Yang VK, Babyak JM, Abelson AL. The effects of two intramuscular sedation protocols on echocardiographic variables in cats following sedation and blood donation. J Vet Emerg Crit Care (San Antonio) 2021; 31:256-262. [PMID: 33713507 DOI: 10.1111/vec.13058] [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: 04/14/2019] [Revised: 07/15/2019] [Accepted: 08/24/2019] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To compare effects of 2 IM sedation protocols, alfaxalone-butorphanol (AB) versus dexmedetomidine-butorphanol (DB), on echocardiographic (ECHO) variables in cats following sedation and blood donation. DESIGN Experimental randomized, blinded crossover study. SETTING University teaching hospital. ANIMALS Eleven client-owned healthy cats. INTERVENTIONS Cats received a baseline ECHO without sedation prior to their first donation. Cats were sedated intramuscularly with AB (alfaxalone, 2 mg/kg, and butorphanol, 0.2 mg/kg) for 1 donation and DB (dexmedetomidine, 10 μg/kg, and butorphanol 0.2, mg/kg) for another, with a minimum 6 weeks between donations. A post-sedation, post-donation ECHO was performed after each blood donation. MEASUREMENTS AND MAIN RESULTS Eight cats completed the study. Compared to baseline, DB combined with blood donation decreased heart rate (-84/min; P < 0.0001), fractional shortening (-16.5%; P < 0.0001), ejection fraction (-21.0%; P = 0.0002), and cardiac output (-292 mL/min, P = 0.0001); AB combined with blood donation increased heart rate (+45/min; P = 0.0003) and decreased left ventricular end diastolic volume (-1.57 mL; P < 0.0001). Compared to AB, DB decreased heart rate (-129/min; P < 0.0001) and fractional shortening (-21.6%; P < 0.0001) and increased left ventricular end-systolic (+1.14 mL; P = 0.0004) and diastolic volumes (+1.93 mL; P < 0.0002). Cats administered DB had a significant increase in regurgitant flow across mitral, aortic, and pulmonic valves following blood donation (P < 0.05). One cat administered DB developed spontaneous echo contrast in the left ventricle following donation. CONCLUSIONS AND CLINICAL RELEVANCE Compared to AB, DB had more pronounced effects on ECHO variables in cats following IM sedation and blood donation. Due to its minimal impact on ECHO variables, AB may be a more desirable sedation protocol in this population of cats.
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Affiliation(s)
- Rebecca C Reader
- Department of Clinical Sciences, Cummings Veterinary Medical Center at Tufts University, North Grafton, Massachusetts
| | - Vicky K Yang
- Department of Clinical Sciences, Cummings Veterinary Medical Center at Tufts University, North Grafton, Massachusetts
| | - Jonathan M Babyak
- Department of Clinical Sciences, Cummings Veterinary Medical Center at Tufts University, North Grafton, Massachusetts
| | - Amanda L Abelson
- Department of Clinical Sciences, Cummings Veterinary Medical Center at Tufts University, North Grafton, Massachusetts
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do Vale GT, da Silva CBP, Sousa AH, Gonzaga NA, Parente JM, Araújo KM, Castro MM, Tirapelli CR. Nebivolol Prevents Up-Regulation of Nox2/NADPH Oxidase and Lipoperoxidation in the Early Stages of Ethanol-Induced Cardiac Toxicity. Cardiovasc Toxicol 2021; 21:224-235. [PMID: 33067693 DOI: 10.1007/s12012-020-09614-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 08/01/2020] [Accepted: 10/10/2020] [Indexed: 12/13/2022]
Abstract
Changes in redox state are described in the early stages of ethanol-induced cardiac toxicity. Here, we evaluated whether nebivolol would abrogate ethanol-induced redox imbalance in the heart. Male Wistar rats were treated with a solution of ethanol (20% v/v) for 3 weeks. Treatment with nebivolol (10 mg/kg/day; p.o. gavage) prevented the increase of both superoxide (O2•-) and thiobarbituric acid reactive substances (TBARS) in the left ventricle of rats chronically treated with ethanol. Neither ethanol nor nebivolol affected the expression of Nox4, p47phox, or Rac-1. Nebivolol prevented ethanol-induced increase of Nox2 expression in the left ventricle. Superoxide dismutase (SOD) activity as well as the concentration of reduced glutathione (GSH) was not altered by ethanol or nebivolol. Augmented catalase activity was detected in the left ventricle of both ethanol- and nebivolol-treated rats. Treatment with nebivolol, but not ethanol increased eNOS expression in the left ventricle. No changes in the activity of matrix metalloproteinase (MMP)2 or in the expressions of MMP2, MMP9, and tissue inhibitor metalloproteinase (TIMP)1 were detected after treatment with ethanol or nebivolol. However, ethanol increased the expression of TIMP2, and this response was prevented by nebivolol. Our results provided novel insights into the mechanisms underlying the early stages of the cardiac injury induced by ethanol consumption. We demonstrated that Nox2/NADPH oxidase-derived ROS play a role in ethanol-induced lipoperoxidation and that this response was prevented by nebivolol. In addition, we provided evidence that MMPs are not activated in the early stages of ethanol-induced cardiac toxicity.
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Affiliation(s)
- Gabriel T do Vale
- Universidade do Estado de Minas Gerais (UEMG), Passos, MG, Brazil
- Programa de Pós-Graduação em Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Carla B P da Silva
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Programa de Pós-graduação em Toxicologia, USP, Ribeirão Preto, SP, Brazil
- Laboratório de Farmacologia Cardiovascular, DEPCH, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, USP, Avenida Bandeirantes 3900, CEP 14040-902, Ribeirão Preto, SP, Brazil
| | - Arthur H Sousa
- Laboratório de Farmacologia Cardiovascular, DEPCH, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, USP, Avenida Bandeirantes 3900, CEP 14040-902, Ribeirão Preto, SP, Brazil
| | - Natália A Gonzaga
- Programa de Pós-Graduação em Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil
- Laboratório de Farmacologia Cardiovascular, DEPCH, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, USP, Avenida Bandeirantes 3900, CEP 14040-902, Ribeirão Preto, SP, Brazil
| | - Juliana M Parente
- Programa de Pós-Graduação em Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Katiúscia M Araújo
- Laboratório de Farmacologia Cardiovascular, DEPCH, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, USP, Avenida Bandeirantes 3900, CEP 14040-902, Ribeirão Preto, SP, Brazil
| | - Michele M Castro
- Programa de Pós-Graduação em Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Carlos R Tirapelli
- Laboratório de Farmacologia Cardiovascular, DEPCH, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, USP, Avenida Bandeirantes 3900, CEP 14040-902, Ribeirão Preto, SP, Brazil.
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Andersen A, Waziri F, Schultz JG, Holmboe S, Becker SW, Jensen T, Søndergaard HM, Dodt KK, May O, Mortensen UM, Kim WY, Mellemkjær S, Nielsen-Kudsk JE. Pulmonary vasodilation by sildenafil in acute intermediate-high risk pulmonary embolism: a randomized explorative trial. BMC Pulm Med 2021; 21:72. [PMID: 33639897 PMCID: PMC7916297 DOI: 10.1186/s12890-021-01440-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 02/19/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To investigate if acute pulmonary vasodilation by sildenafil improves right ventricular function in patients with acute intermediate-high risk pulmonary embolism (PE). METHODS Single center, explorative trial. Patients with PE were randomized to a single oral dose of sildenafil 50 mg (n = 10) or placebo (n = 10) as add-on to conventional therapy. The time from hospital admission to study inclusion was 2.3 ± 0.7 days. Right ventricular function was evaluated immediately before and shortly after (0.5-1.5 h) randomization by right heart catheterization (RHC), trans-thoracic echocardiography (TTE), and cardiac magnetic resonance (CMR). The primary efficacy endpoint was cardiac index measured by CMR. RESULTS Patients had acute intermediate-high risk PE verified by computed tomography pulmonary angiography, systolic blood pressure of 135 ± 18 (mean ± SD) mmHg, increased right ventricular/left ventricular ratio 1.1 ± 0.09 and increased troponin T 167 ± 144 ng/L. Sildenafil treatment did not improve cardiac index compared to baseline (0.02 ± 0.36 l/min/m2, p = 0.89) and neither did placebo (0.00 ± 0.34 l/min/m2, p = 0.97). Sildenafil lowered mean arterial blood pressure (- 19 ± 10 mmHg, p < 0.001) which was not observed in the placebo group (0 ± 9 mmHg, p = 0.97). CONCLUSION A single oral dose of sildenafil 50 mg did not improve cardiac index but lowered systemic blood pressure in patients with acute intermediate-high risk PE. The time from PE to intervention, a small patient sample size and low pulmonary vascular resistance are limitations of this study that should be considered when interpreting the results. TRIAL REGISTRATION The trial was retrospectively registered at www.clinicaltrials.gov (NCT04283240) February 2nd 2020, https://clinicaltrials.gov/ct2/show/NCT04283240?term=NCT04283240&draw=2&rank=1 .
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Affiliation(s)
- Asger Andersen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark.
| | - Farhad Waziri
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | - Jacob Gammelgaard Schultz
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | - Sarah Holmboe
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | | | - Tage Jensen
- Department of Internal Medicine, Region Hospital of Randers, Randers, Denmark
| | | | - Karen Kaae Dodt
- Department of Internal Medicine, Region Hospital of Horsens, Horsens, Denmark
| | - Ole May
- Department of Internal Medicine, Region Hospital of Herning, Herning, Denmark
| | - Ulrik Markus Mortensen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | - Won Yong Kim
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | - Søren Mellemkjær
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | - Jens Erik Nielsen-Kudsk
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
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Guo Y, Zhang C, Chen X, Liu X, Ye T, Fo Y, Shi S, Qu C, Liang J, Shen B, Yang B. Sigma-1 receptor ligands improves ventricular repolarization-related ion remodeling in rats with major depression disorder. Psychopharmacology (Berl) 2021; 238:487-499. [PMID: 33140216 DOI: 10.1007/s00213-020-05697-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 06/27/2020] [Accepted: 10/23/2020] [Indexed: 02/07/2023]
Abstract
RATIONALE It has been reported that patients with major depressive disorder (MDD) are prone to developing ventricular arrhythmias. Moreover, the Sigma-1 receptor not only plays a crucial role in MDD but has also been shown to have antiarrhythmic properties. The Sigma-1 receptor is a common receptor related to depression and ventricular arrhythmias. OBJECTIVE We analyzed the effects of the Sigma-1 receptor on depression and ventricular repolarization-related ion remodeling in MDD rats. METHODS MDD was induced in rats by chronic unpredictable mild stress (CUMS), and 28 days later, the rats were subjected to behavior tests. Protein expression was measured by western blotting, and cardiac morphological changes were observed by Masson staining. Electrophysiological measurement of the myocardium was performed with the whole-cell patch-clamp technique. RESULTS Compared with the control rats, the MDD rats exhibited lower transient outward potassium current (Ito) and L-type calcium current (ICa-L) amplitudes. On the other hand, a trend of depolarization of Ito and hyperpolarization of ICa-L was observed in the MDD rats. Thus, we investigated the effect of fluvoxamine, a Sigma-1 receptor agonist, on Ito and ICa-L. Fluvoxamine enhanced Ito and altered its current kinetics, as shown by acceleration of activation and recovery from inactivation. In contrast, fluvoxamine inhibited the Ca2+ by hyperpolarizing the steady-state activation of ICa-L. All these effects were blocked by BD1047. CONCLUSION Taken together, our results indicate that Sigma-1 receptor modulates the functions of Ito and ICa-L to possibly exert antiarrhythmic effects.
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Affiliation(s)
- Yan Guo
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Cui Zhang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Xiuhuan Chen
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Xin Liu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Tianxin Ye
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Yuhong Fo
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Shaobo Shi
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Chuan Qu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Jinjun Liang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China
| | - Bo Shen
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China.
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China.
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China.
| | - Bo Yang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China.
- Cardiovascular Research Institute, Wuhan University, Wuhan, People's Republic of China.
- Hubei Key Laboratory of Cardiology, Wuhan, People's Republic of China.
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Gomez Isaza DF, Cramp RL, Franklin CE. Thermal plasticity of the cardiorespiratory system provides cross-tolerance protection to fish exposed to elevated nitrate. Comp Biochem Physiol C Toxicol Pharmacol 2021; 240:108920. [PMID: 33141082 DOI: 10.1016/j.cbpc.2020.108920] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 08/27/2020] [Revised: 10/09/2020] [Accepted: 10/18/2020] [Indexed: 02/07/2023]
Abstract
Exposure to nitrate is toxic to aquatic animals due to the formation of methaemoglobin and a subsequent loss of blood-oxygen carrying capacity. Yet, nitrate toxicity can be modulated by other stressors in the environment, such as elevated temperatures. Acclimation to elevated temperatures has been shown to offset the negative effects of nitrate on whole animal performance in fish, but the mechanisms underlying this cross-tolerance interaction remain unclear. In this study, juvenile silver perch (Bidyanus bidyanus) were exposed to a factorial combination of temperature (28 °C or 32 °C) and nitrate concentrations (0, 50 or 100 mg NO3- L-1) treatments to test the hypothesis that thermal acclimation offsets the effects of nitrate via compensatory changes to the cardiorespiratory system (gills, ventricle and blood oxygen carrying capacity). Following 21 weeks of thermal acclimation, we found that fish acclimated to 32 °C experienced an expansion of gill surface area and an increase in ventricular thickness regardless of nitrate exposure concentration. Exposure to nitrate (both 50 and 100 mg NO3- L-1) reduced the blood oxygen carrying capacity of silver perch due to increases in methaemoglobin concentration and a right shift in oxygen-haemoglobin binding curves in fish from both thermal acclimation treatments. These results indicate that plasticity of the gills and ventricle of warm acclimated fish are potential mechanisms which may provide cross-tolerance protection to elevated nitrate concentrations despite nitrate induced reductions to oxygen transport.
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Affiliation(s)
- Daniel F Gomez Isaza
- School of Biological Science, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Rebecca L Cramp
- School of Biological Science, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Craig E Franklin
- School of Biological Science, The University of Queensland, Brisbane, QLD 4072, Australia
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Rameshrad M, Omidkhoda SF, Razavi BM, Hosseinzadeh H. Evaluating the possible role of mitochondrial ATP-sensitive potassium channels in the cardioprotective effects of morin in the isolated rat heart. Life Sci 2021; 264:118659. [PMID: 33148418 DOI: 10.1016/j.lfs.2020.118659] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 07/16/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 12/28/2022]
Abstract
AIMS During heart ischemia, the lack of oxygen in the myocardial cells causes pH and ion disturbances and cell death through opening mitochondrial permeability transition pores (mPTP). Considering the inhibitory effects of mitochondrial ATP-dependent potassium channels (mt-KATP) on these pores and anti-ischemic effects of morin, we hypothesized that it may exert its positive effects via activating mt-KATP as well as its anti-oxidative effects. MAIN METHODS Isolated rat hearts were perfused by Krebs-Henseleit solution enriched with the morin (0.25, 0.5 and 1 mg/L) or 5-hydroxydecanoate (5-HD, a mt-KATP blocker;100 μM) or both as needed 5 min before starting regional ischemia till the first 10 min of the reperfusion period. The reperfusion was developed with Krebs-Henseleit solution 60 or 120 min respectively for biochemical evaluations (lactate dehydrogenase and malondialdehyde level) or the assessment of myocardial infarct size. During the experiments, hemodynamic functions were recorded and cardiac arrhythmias were determined. KEY FINDINGS Our findings demonstrated that morin reduced the infarct size. Also, morin perfusion could remarkably prevent the malondialdehyde over-production during ischemia. Total ventricular ectopic beats had the same significant changes as the malondialdehyde level, in both ischemia and reperfusion phases. Morin could also relatively improve the ischemia-induced hemodynamic dysfunction. All mentioned protective effects of morin were reversed by concomitant perfusion of 5-HD. SIGNIFICANCE Morin has protective effects against ischemic hearts through anti-oxidative effects. It also suggests a link between the cardioprotective effects of morin and mt-KATP. However, additional studies are required to prove this preliminary hypothesis.
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Affiliation(s)
- Maryam Rameshrad
- Natural Products and Medicinal Plants Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Seyedeh Farzaneh Omidkhoda
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Bibi Marjan Razavi
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Hosseinzadeh
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
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Silva MM, de Souza-Neto FP, Jesus ICGD, Gonçalves GK, Santuchi MDC, Sanches BDL, de Alcântara-Leonídio TC, Melo MB, Vieira MAR, Guatimosim S, Santos RAS, da Silva RF. Alamandine improves cardiac remodeling induced by transverse aortic constriction in mice. Am J Physiol Heart Circ Physiol 2021; 320:H352-H363. [PMID: 33124885 DOI: 10.1152/ajpheart.00328.2020] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [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: 05/08/2020] [Revised: 09/30/2020] [Accepted: 10/21/2020] [Indexed: 12/30/2022]
Abstract
Alamandine is the newest identified peptide of the renin-angiotensin system (RAS) and has protective effects in the cardiovascular system. Although the involvement of classical RAS components in the genesis and progression of cardiac remodeling is well known, less is known about the effects of alamandine. Therefore, in the present study we investigated the effects of alamandine on cardiac remodeling induced by transverse aortic constriction (TAC) in mice. Male mice (C57BL/6), 10-12 wk of age, were divided into three groups: sham operated, TAC, and TAC + ALA (30 µg/kg/day alamandine for 14 days). The TAC surgery was performed under ketamine and xylazine anesthesia. At the end of treatment, the animals were submitted to echocardiographic examination and subsequently euthanized for tissue collection. TAC induced myocyte hypertrophy, collagen deposition, and the expression of matrix metalloproteinase (MMP)-2 and transforming growth factor (TGF)-β in the left ventricle. These markers of cardiac remodeling were reduced by oral treatment with alamandine. Western blotting analysis showed that alamandine prevents the increase in ERK1/2 phosphorylation and reverts the decrease in 5'-adenosine monophosphate-activated protein kinase (AMPK)α phosphorylation induced by TAC. Although both TAC and TAC + ALA increased SERCA2 expression, the phosphorylation of phospholamban in the Thr17 residue was increased solely in the alamandine-treated group. The echocardiographic data showed that there are no functional or morphological alterations after 2 wk of TAC. Alamandine treatment prevents myocyte hypertrophy and cardiac fibrosis induced by TAC. Our results reinforce the cardioprotective role of alamandine and highlight its therapeutic potential for treating heart diseases related to pressure overload conditions.NEW & NOTEWORTHY Alamandine is the newest identified component of the renin-angiotensin system protective arm. Considering the beneficial effects already described so far, alamandine is a promising target for cardiovascular disease treatment. We demonstrated for the first time that alamandine improves many aspects of cardiac remodeling induced by pressure overload, including cell hypertrophy, fibrosis, and oxidative stress markers.
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Affiliation(s)
- Mário Morais Silva
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | | | - Gleisy Kelly Gonçalves
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Bruno de Lima Sanches
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Marcos Barrouin Melo
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Silvia Guatimosim
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
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Zhang J, Cao L, Tan Y, Zheng Y, Gui Y. N-acetylcysteine protects neonatal mice from ventricular hypertrophy induced by maternal obesity in a sex-specific manner. Biomed Pharmacother 2021; 133:110989. [PMID: 33378994 DOI: 10.1016/j.biopha.2020.110989] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 07/14/2020] [Revised: 10/28/2020] [Accepted: 11/05/2020] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Maternal obesity induces adverse cardiac programming in offspring, and effective interventions are needed to prevent cardiovascular ill-health. Herein we hypothesized that exposure to maternal obesogenic diet-induced obesity in mice results in left ventricular remodelling and hypertrophy in early childhood, and that maternal N-acetylcysteine (NAC) treatment alleviates these effects in a sex-dependent manner. METHODS AND RESULTS The maternal obesity was induced in mice by the consumption of a Western diet accompanied by a 20 % sucrose solution. To determine the effect of NAC on the cardiac outcomes induced by maternal obesity, obese dams were continuously exposed to the obesogenic diet, with or without the oral NAC treatment during pregnancy. Left ventricular remodelling and hypertrophy occurred as early as 7 days after birth in the male offspring of obese dams (O-OB) compared with controls (O-CO). An over-expression of key genes and markers related to cardiac fibrosis accompanied by more disorganized myofibrils was observed in the hearts of neonatal male O-OB mice. When we next evaluated the level of oxidative stress in the hearts of neonatal mice, the activity of enzymatic antioxidants declined and expression of NOX enzyme complex was up-regulated in O-OB offspring hearts, but was normal in the offspring of NAC treated mice (O-OB/NAC). Maternal obesity also activated cardiac Akt and mammalian target of rapamycin (mTOR) signalling in offspring, and NAC treatment restored offspring cardiac Akt-mTOR signalling to normal irrespective of sex. NAC treatment did not prevent cardiomyocyte hypertrophy but did alleviate increased heart weight, interventricular septal thickness, and collagen content in male O-OB/NAC pups. CONCLUSIONS Collectively, our results indicated that NAC blunted cardiac fibrosis and related ventricular hypertrophy of male neonatal offspring in the setting of maternal obesity, potentially acting by reducing oxidative stress. The present study provides a basis for investigating the role of NAC in nutrition-related cardiac programming.
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MESH Headings
- Acetylcysteine/pharmacology
- Animal Nutritional Physiological Phenomena
- Animals
- Animals, Newborn
- Antioxidants/pharmacology
- Disease Models, Animal
- Female
- Fibrosis
- Heart Ventricles/drug effects
- Heart Ventricles/metabolism
- Heart Ventricles/physiopathology
- Hypertrophy, Left Ventricular/etiology
- Hypertrophy, Left Ventricular/metabolism
- Hypertrophy, Left Ventricular/physiopathology
- Hypertrophy, Left Ventricular/prevention & control
- Male
- Maternal Nutritional Physiological Phenomena
- Mice, Inbred C57BL
- Obesity, Maternal/complications
- Obesity, Maternal/physiopathology
- Oxidative Stress/drug effects
- Pregnancy
- Prenatal Exposure Delayed Effects
- Sex Factors
- Ventricular Function, Left/drug effects
- Ventricular Remodeling/drug effects
- Mice
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Affiliation(s)
- Jialing Zhang
- Cardiovascular Center, Children's Hospital of Fudan University, Shanghai, China; MOH Key Laboratory of Neonatal Diseases at Children's Hospital, Fudan University, Shanghai, China
| | - Li Cao
- Ultrasound Department, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
| | - Yanfeng Tan
- Institute of Pediatrics, Children's Hospital of Fudan University, Shanghai, China
| | - Yuanzheng Zheng
- Cardiovascular Center, Children's Hospital of Fudan University, Shanghai, China; MOH Key Laboratory of Neonatal Diseases at Children's Hospital, Fudan University, Shanghai, China
| | - Yonghao Gui
- Cardiovascular Center, Children's Hospital of Fudan University, Shanghai, China; MOH Key Laboratory of Neonatal Diseases at Children's Hospital, Fudan University, Shanghai, China.
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Zang X, Zhao J, Lu C. PM2.5 inducing myocardial fibrosis mediated by Ang II/ERK1/2/TGF-β 1 signaling pathway in mice model. J Renin Angiotensin Aldosterone Syst 2021; 22:14703203211003786. [PMID: 33726569 PMCID: PMC7983242 DOI: 10.1177/14703203211003786] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 02/26/2021] [Indexed: 11/17/2022] Open
Abstract
OBJECTS To discuss the influence of PM2.5 on myocardial fibrosis and related mechanism. METHODS PM2.5 particles were prepared into different concentrations of solution to drip into the mice's trachea twice each week. The mice were divided into five groups, Blank control group (C group), NS control group (J group), high dose group (G group, 10 mg/kg), medium dose group (Z group, 5 mg/kg), and 1ow dose group (D group, 2.5 mg/kg). After 6 weeks, the myocardial fibrosis was observed by HE and Masson staining. The expression of Ang II, ERK1/2, and TGF-β1 was examined by Western Blotting (WB) and Real time PCR (RT-PCR). RESULTS The higher dose PM2.5 was administrated, the worse the myocardial fibrosis was in PM2.5 groups. The expression of Ang II, ERK1/2, and TGF-β1 was increased in higher dose groups in protein and mRNA level. CONCLUSION 1. PM2.5 induced the cardiac fibrosis. 2. PM2.5 dripped into trachea in mice model activated the expression of Ang II, ERK1/2, and TGF-β1. The activation of renin-angiotensin system (RAS) was suggested to participate in the cardiac fibrosis induced by PM2.5.
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Affiliation(s)
- Xiwen Zang
- Tianjin Medical University, Teda
International Cardiovascular Hospital, Tianjin, China
| | - Jun Zhao
- Tianjin Key Laboratory of Ionic-Molecular
Function of Cardiovascular disease(Key Lab-TIC), Tianjin Institute of Cardiology (TIC),
Department of Cardiology, Second Hospital of Tianjin Medical University, Tianjin,
China
| | - Chengzhi Lu
- First Center Clinic College of Tianjin
Medical University, Tianjin First Center Hospital, Tianjin, China
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Ye S, Zhou X, Chen P, Lin JF. Folic acid attenuates remodeling and dysfunction in the aging heart through the ER stress pathway. Life Sci 2021; 264:118718. [PMID: 33160997 DOI: 10.1016/j.lfs.2020.118718] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 08/06/2020] [Revised: 10/13/2020] [Accepted: 11/02/2020] [Indexed: 02/06/2023]
Abstract
AIMS Age-related structure changes and dysfunction of heart are likely to contribute heart failure in elderly people. Recent studies have shown that folic acid supplementation effectively delays age-related declines; nevertheless, the role and mechanism of folic acid in protection against cardiac aging remain unclear. The aim of the current study was to determine whether folic acid inhibits remodeling and dysfunction during the aging process and to elucidate its underlying mechanisms. MAIN METHODS Male C57BL/6 mice aged 4 months (adult) and 14 months (aged) were fed a standard diet or a folic acid diet for 6 months. Echocardiograms and histological evaluations were used to detect left ventricle (LV) function, LV remodeling, cardiac fibrosis, apoptosis and oxidative stress. Senescence-associated β-galactosidase activity staining was used to detect cardiac senescence rate. Western blotting was employed to detect the levels of senescence and ER stress signaling. KEY FINDING LV hypertrophy was reduced and LV function was preserved in aged mice that consumed folic acid. LV remodeling, fibrosis, apoptosis and oxidative stress were also reduced in mice that consumed folic acid. Senescence-associated β-galactosidase activity staining revealed that folic acid attenuated cardiac senescence by down-regulating p53/p21/p16 levels. Protein assays of myocardial tissue revealed that the ER stress pathway is the important underlying mechanism during cardiac senescence. The involvement of these pathways was confirmed by doxorubicin-induced H9C2 cardiomyocyte senescence. SIGNIFICANCE These findings suggest that folic acid prevents age-related cardiac remodeling and dysfunction and attenuates cellular senescence. ER stress responses may be the mechanisms involved in the protective effect of folic acid against cardiac aging.
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Affiliation(s)
- Sheng Ye
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xi Zhou
- Department of Cardiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Peng Chen
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jia-Feng Lin
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China.
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43
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Rutledge CA, Chiba T, Redding K, Dezfulian C, Sims-Lucas S, Kaufman BA. A novel ultrasound-guided mouse model of sudden cardiac arrest. PLoS One 2020; 15:e0237292. [PMID: 33275630 PMCID: PMC7717537 DOI: 10.1371/journal.pone.0237292] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 10/16/2020] [Indexed: 12/25/2022] Open
Abstract
AIM Mouse models of sudden cardiac arrest are limited by challenges with surgical technique and obtaining reliable venous access. To overcome this limitation, we sought to develop a simplified method in the mouse that uses ultrasound-guided injection of potassium chloride directly into the heart. METHODS Potassium chloride was delivered directly into the left ventricular cavity under ultrasound guidance in intubated mice, resulting in immediate asystole. Mice were resuscitated with injection of epinephrine and manual chest compressions and evaluated for survival, body temperature, cardiac function, kidney damage, and diffuse tissue injury. RESULTS The direct injection sudden cardiac arrest model causes rapid asystole with high surgical survival rates and short surgical duration. Sudden cardiac arrest mice with 8-min of asystole have significant cardiac dysfunction at 24 hours and high lethality within the first seven days, where after cardiac function begins to improve. Sudden cardiac arrest mice have secondary organ damage, including significant kidney injury but no significant change to neurologic function. CONCLUSIONS Ultrasound-guided direct injection of potassium chloride allows for rapid and reliable cardiac arrest in the mouse that mirrors human pathology without the need for intravenous access. This technique will improve investigators' ability to study the mechanisms underlying post-arrest changes in a mouse model.
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Affiliation(s)
- Cody A. Rutledge
- Division of Cardiology, Cardiovascular Institute, University of Pittsburgh, Pittsburgh, PA, United States of America
| | - Takuto Chiba
- Rangos Research Center, Children’s Hospital of Pittsburgh, University of Pittsburgh, Pittsburgh, PA, United States of America
- Division of Nephrology, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America
| | - Kevin Redding
- Division of Cardiology, Cardiovascular Institute, University of Pittsburgh, Pittsburgh, PA, United States of America
| | - Cameron Dezfulian
- Safar Center for Resuscitation Research and Critical Care Medicine Department, University of Pittsburgh, Pittsburgh, PA, United States of America
| | - Sunder Sims-Lucas
- Rangos Research Center, Children’s Hospital of Pittsburgh, University of Pittsburgh, Pittsburgh, PA, United States of America
- Division of Nephrology, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America
| | - Brett A. Kaufman
- Division of Cardiology, Cardiovascular Institute, University of Pittsburgh, Pittsburgh, PA, United States of America
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Faragli A, Tanacli R, Kolp C, Abawi D, Lapinskas T, Stehning C, Schnackenburg B, Lo Muzio FP, Fassina L, Pieske B, Nagel E, Post H, Kelle S, Alogna A. Cardiovascular magnetic resonance-derived left ventricular mechanics-strain, cardiac power and end-systolic elastance under various inotropic states in swine. J Cardiovasc Magn Reson 2020; 22:79. [PMID: 33256761 PMCID: PMC7708216 DOI: 10.1186/s12968-020-00679-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Accepted: 10/06/2020] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Cardiovascular magnetic resonance (CMR) strain imaging is an established technique to quantify myocardial deformation. However, to what extent left ventricular (LV) systolic strain, and therefore LV mechanics, reflects classical hemodynamic parameters under various inotropic states is still not completely clear. Therefore, the aim of this study was to investigate the correlation of LV global strain parameters measured via CMR feature tracking (CMR-FT, based on conventional cine balanced steady state free precession (bSSFP) images) with hemodynamic parameters such as cardiac index (CI), cardiac power output (CPO) and end-systolic elastance (Ees) under various inotropic states. METHODS Ten anaesthetized, healthy Landrace swine were acutely instrumented closed-chest and transported to the CMR facility for measurements. After baseline measurements, two steps were performed: (1) dobutamine-stress (Dobutamine) and (2) verapamil-induced cardiovascular depression (Verapamil). During each protocol, CMR images were acquired in the short axisand apical 2Ch, 3Ch and 4Ch views. MEDIS software was utilized to analyze global longitudinal (GLS), global circumferential (GCS), and global radial strain (GRS). RESULTS Dobutamine significantly increased heart rate, CI, CPO and Ees, while Verapamil decreased them. Absolute values of GLS, GCS and GRS accordingly increased during Dobutamine infusion, while GLS and GCS decreased during Verapamil. Linear regression analysis showed a moderate correlation between GLS, GCS and LV hemodynamic parameters, while GRS correlated poorly. Indexing global strain parameters for indirect measures of afterload, such as mean aortic pressure or wall stress, significantly improved these correlations, with GLS indexed for wall stress reflecting LV contractility as the clinically widespread LV ejection fraction. CONCLUSION GLS and GCS correlate accordingly with LV hemodynamics under various inotropic states in swine. Indexing strain parameters for indirect measures of afterload substantially improves this correlation, with GLS being as good as LV ejection fraction in reflecting LV contractility. CMR-FT-strain imaging may be a quick and promising tool to characterize LV hemodynamics in patients with varying degrees of LV dysfunction.
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Affiliation(s)
- A Faragli
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site, Berlin, Germany
- Department of Internal Medicine/Cardiology, Deutsches Herzzentrum Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - R Tanacli
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
- Department of Internal Medicine/Cardiology, Deutsches Herzzentrum Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - C Kolp
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
| | - D Abawi
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
| | - T Lapinskas
- Department of Internal Medicine/Cardiology, Deutsches Herzzentrum Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
- Department of Cardiology, Medical Academy, Lithuanian University of Health Sciences, Eiveniu Street 2, 50161, Kaunas, Lithuania
| | - C Stehning
- Clinical Science, Philips Healthcare, Röntgenstr. 24, 22335, Hamburg, Germany
| | - B Schnackenburg
- Clinical Science, Philips Healthcare, Röntgenstr. 24, 22335, Hamburg, Germany
| | - F P Lo Muzio
- Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona, Via S. Francesco 22, 37129, Verona, Italy
- Department of Medicine and Surgery, University of Parma, Via Gramsci 14, 43126, Parma, Italy
| | - L Fassina
- Department of Electrical, Computer and Biomedical Engineering (DIII), Centre for Health Technologies (CHT), University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
| | - B Pieske
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site, Berlin, Germany
- Department of Internal Medicine/Cardiology, Deutsches Herzzentrum Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - E Nagel
- Institute of Experimental and Translational Cardiac Imaging, DZHK Centre for Cardiovascular Imaging, Goethe University Hospital Frankfurt, Frankfurt am Main, Germany
| | - H Post
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site, Berlin, Germany
- Department of Cardiology, Contilia Heart and Vessel Centre, St. Marien-Hospital Mülheim, 45468, Mülheim, Germany
| | - S Kelle
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site, Berlin, Germany
- Department of Internal Medicine/Cardiology, Deutsches Herzzentrum Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - A Alogna
- Department of Internal Medicine and Cardiology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany.
- Berlin Institute of Health (BIH), Berlin, Germany.
- DZHK (German Centre for Cardiovascular Research), partner site, Berlin, Germany.
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Honda Y, Kosugi K, Fuchikami C, Kuramoto K, Numakura Y, Kuwano K. The selective PGI2 receptor agonist selexipag ameliorates Sugen 5416/hypoxia-induced pulmonary arterial hypertension in rats. PLoS One 2020; 15:e0240692. [PMID: 33057388 PMCID: PMC7561119 DOI: 10.1371/journal.pone.0240692] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 10/01/2020] [Indexed: 11/25/2022] Open
Abstract
Pulmonary arterial hypertension (PAH) is a lethal disease characterized by a progressive increase in pulmonary artery pressure due to an increase in vessel tone and occlusion of vessels. The endogenous vasodilator prostacyclin and its analogs are used as therapeutic agents for PAH. However, their pharmacological effects on occlusive vascular remodeling have not been elucidated yet. Selexipag is a recently approved, orally available and selective prostacyclin receptor agonist with a non-prostanoid structure. In this study, we investigated the pharmacological effects of selexipag on the pathology of chronic severe PAH in Sprague-Dawley and Fischer rat models in which PAH was induced by a combination of injection with the vascular endothelial growth factor receptor antagonist Sugen 5416 and exposure to hypoxia (SuHx). Oral administration of selexipag for three weeks significantly improved right ventricular systolic pressure and right ventricular (RV) hypertrophy in Sprague-Dawley SuHx rats. Selexipag attenuated the proportion of lung vessels with occlusive lesions and the medial wall thickness of lung arteries, corresponding to decreased numbers of Ki-67-positive cells and a reduced expression of collagen type 1 in remodeled vessels. Administration of selexipag to Fischer rats with SuHx-induced PAH reduced RV hypertrophy and mortality caused by RV failure. These effects were probably based on the potent prostacyclin receptor agonistic effect of selexipag on pulmonary vessels. Selexipag has been approved and is used in the clinical treatment of PAH worldwide. It is thought that these beneficial effects of prostacyclin receptor agonists on multiple aspects of PAH pathology contribute to the clinical outcomes in patients with PAH.
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MESH Headings
- 15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid/pharmacology
- 15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid/therapeutic use
- Acetamides/pharmacology
- Acetamides/therapeutic use
- Animals
- Cell Proliferation/drug effects
- Collagen Type I/metabolism
- Disease Models, Animal
- Heart Ventricles/drug effects
- Heart Ventricles/physiopathology
- Hemodynamics/drug effects
- Hypertrophy, Right Ventricular/chemically induced
- Hypertrophy, Right Ventricular/physiopathology
- Hypoxia/complications
- Hypoxia/physiopathology
- Indoles
- Lung/drug effects
- Lung/pathology
- Lung/physiopathology
- Male
- Pulmonary Arterial Hypertension/complications
- Pulmonary Arterial Hypertension/drug therapy
- Pulmonary Arterial Hypertension/etiology
- Pulmonary Arterial Hypertension/physiopathology
- Pyrazines/pharmacology
- Pyrazines/therapeutic use
- Pyrroles
- Rats, Sprague-Dawley
- Receptors, Epoprostenol/agonists
- Receptors, Epoprostenol/metabolism
- Systole/drug effects
- Vascular Remodeling/drug effects
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Affiliation(s)
- Yohei Honda
- Discovery Research Laboratories, Nippon Shinyaku Co., Ltd, Kyoto, Japan
- * E-mail:
| | - Keiji Kosugi
- R&D Administration Division, Nippon Shinyaku Co., Ltd, Kyoto, Japan
| | - Chiaki Fuchikami
- Discovery Research Laboratories, Nippon Shinyaku Co., Ltd, Kyoto, Japan
| | - Kazuya Kuramoto
- R&D Administration Division, Nippon Shinyaku Co., Ltd, Kyoto, Japan
| | - Yuki Numakura
- Discovery Research Laboratories, Nippon Shinyaku Co., Ltd, Kyoto, Japan
| | - Keiichi Kuwano
- R&D Administration Division, Nippon Shinyaku Co., Ltd, Kyoto, Japan
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Hasan KM, Friedman TC, Parveen M, Espinoza-Derout J, Bautista F, Razipour MM, Shao XM, Jordan MC, Roos KP, Mahata SK, Sinha-Hikim AP. Electronic cigarettes cause alteration in cardiac structure and function in diet-induced obese mice. PLoS One 2020; 15:e0239671. [PMID: 33002059 PMCID: PMC7529198 DOI: 10.1371/journal.pone.0239671] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 08/30/2020] [Indexed: 11/19/2022] Open
Abstract
In spite of the widespread use of electronic cigarettes, also known as e-cigarettes, and the proposed adverse cardiac effects of nicotine, the detrimental effects of e-cigarettes on the heart are not well known. This study examines the detrimental effects of e-cigarettes with nicotine at doses that yield circulating nicotine and cotinine in the ranges similar to the levels found in habitual smokers, and a high fat diet (HFD) on cardiac structure and function in a commonly used model of diet-induced obesity (DIO). C57BL/6J mice on an HFD were exposed to e-cigarette in the presence (2.4% nicotine) or absence (0% nicotine) of nicotine and saline aerosol for 12 weeks. Echocardiographic data demonstrated a decrease in left ventricular (LV) fractional shortening, LV ejection fraction, and velocity of circumferential fiber shortening (VCF) in mice treated with e-cigarette (2.4% nicotine) compared to e-cigarette (0% nicotine) or saline exposed mice. Cardiomyocytes (CMs) of mice treated with e-cigarette (2.4% nicotine) exhibited LV abnormalities, including lipid accumulation (ventricular steatosis), myofibrillar derangement and destruction, and mitochondrial hypertrophy, as revealed by transmission electron microscopy. The detrimental effects of e-cigarettes (2.4% nicotine) on cardiac structure and function was accompanied by increased oxidative stress, plasma free fatty acid levels, CM apoptosis, and inactivation of AMP-activated protein kinase and activation of its downstream target, acetyl-CoA-carboxylase. Our results indicate profound adverse effects of e-cigarettes (2.4% nicotine) on the heart in obese mice and raise questions about the safety of the nicotine e-cigarettes use.
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Affiliation(s)
- Kamrul M. Hasan
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
- * E-mail: (KMH); (APSH)
| | - Theodore C. Friedman
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
- David Geffen School of Medicine at University of California, Los Angeles, CA, United States of America
| | - Meher Parveen
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
| | - Jorge Espinoza-Derout
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
| | - Francisco Bautista
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
| | - Mohammad M. Razipour
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
| | - Xuesi M. Shao
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
- David Geffen School of Medicine at University of California, Los Angeles, CA, United States of America
| | - Maria C. Jordan
- David Geffen School of Medicine at University of California, Los Angeles, CA, United States of America
| | - Kenneth P. Roos
- David Geffen School of Medicine at University of California, Los Angeles, CA, United States of America
| | - Sushil K. Mahata
- VA San Diego Health Care System and University of California, San Diego, CA, United States of America
| | - Amiya P. Sinha-Hikim
- Division of Endocrinology, Metabolism and Molecular Medicine, Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA, United States of America
- David Geffen School of Medicine at University of California, Los Angeles, CA, United States of America
- * E-mail: (KMH); (APSH)
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Chen X, Zhang C, Guo Y, Liu X, Ye T, Fo Y, Qu C, Liang J, Shi S, Yang B. Chronic stimulation of the sigma-1 receptor ameliorates ventricular ionic and structural remodeling in a rodent model of depression. Life Sci 2020; 257:118047. [PMID: 32629001 DOI: 10.1016/j.lfs.2020.118047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 04/06/2020] [Revised: 06/26/2020] [Accepted: 06/30/2020] [Indexed: 10/23/2022]
Abstract
AIM The purpose of the study was to investigate what effects the sigma-1 receptor (S1R) could exert on the cardiac myocyte ion channels in a rodent model of depression and to explore the underlying mechanisms since depression is an independent risk factor for cardiovascular diseases including ventricular arrhythmias (VAs). MATERIALS AND METHODS To establish the depression model in rats, chronic mild unpredictable stress (CMUS) for 28 days was used. The S1R agonist fluvoxamine was injected intraperitoneally from the second week to the last week for 21 days in total, and the effects were evaluated by patch clamp, western blot analysis, and Masson staining. KEY FINDINGS We demonstrated that depression was improved after treatment with fluvoxamine. In addition, the prolongation of the corrected QT (QTc) interval under CMUS that increased vulnerability to VAs was significantly attenuated by stimulation of S1R due to the decreased amplitude of L-type calcium current (ICa-L) and the restoration of reduced transient outward potassium current (Ito) resulting from CMUS induction. The S1R also decelerated Ito inactivation and accelerated Ito recovery by activating Ca2+/calmodulin-dependent kinase II. Moreover, the stimulation of S1R ameliorated the structural remodeling as the substrate for maintenance of VAs. All these effects were abolished by the administration of S1R antagonist BD1047, which verified the roles for S1R. SIGNIFICANCE Activation of S1R could decrease the vulnerability to VAs by inhibiting ICa-L and restoring Ito, in addition to ameliorating the CMUS-induced depressive symptoms and structural remodeling.
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Affiliation(s)
- Xiuhuan Chen
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Cui Zhang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Yan Guo
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Xin Liu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Tianxin Ye
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Yuhong Fo
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Chuan Qu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Jinjun Liang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China
| | - Shaobo Shi
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China.
| | - Bo Yang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China.
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48
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Terzic D, Zois NE, Hunter I, Christoffersen C, Plomgaard P, Olsen LH, Ringholm S, Pilegaard H, Goetze JP. Effect of insulin on natriuretic peptide gene expression in porcine heart. Peptides 2020; 131:170370. [PMID: 32663503 DOI: 10.1016/j.peptides.2020.170370] [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: 05/05/2020] [Revised: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 11/16/2022]
Abstract
Gut hormones affect cardiac function and contractility. In this study, we examined whether insulin affects the cardiac atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP) gene expression and release of proANP-derived peptides in pigs. Anaesthetized pigs were included in an experimental study comparing the effect of hyperinsulinemia in 15 pigs submitted to two different protocols versus 11 control pigs receiving saline infusion. Phosphorylation of Akt on Thr308 was determined by western blotting with a pAkt-Thr308 antibody. The mRNA contents of ANP and BNP were determined with real-time PCR; plasma and cardiac tissue proANP was measured with an immunoluminometric assay targeted against the mid-region of the propeptide and a processing-independent assay. Insulin stimulation increased phosphorylation of Akt Thr308 in both left atrium and left ventricle of porcine hearts (p < 0.005). No change was observed in ANP and BNP mRNA contents in the right or left atrium. BNP mRNA contents in the left ventricle, however, decreased 3-fold (p = 0.02) compared to control animals, whereas the BNP mRNA content in the right ventricle as well as ANP mRNA content in the right and left ventricle did not change following hyperinsulinemia. Moreover, the peptide contents did not change in the four cardiac chambers. Finally, proANP concentrations in plasma did not change during the insulin infusion compared to the control animals. These results suggest that insulin does not have direct effect on atrial natriuretic peptide expression but may have a role in the left ventricle.
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Affiliation(s)
- Dijana Terzic
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.
| | - Nora E Zois
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
| | - Ingrid Hunter
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
| | - Christina Christoffersen
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Peter Plomgaard
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
| | - Lisbeth Høier Olsen
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Stine Ringholm
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | | | - Jens P Goetze
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
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Musavi Mehdiabadi F, Rashidinejad A, Mahdavi A, Dehesh T. Relationship Between Thyroid Hormones and Left Ventricular Mass in Peritoneal Dialysis Patients. Iran J Kidney Dis 2020; 14:380-388. [PMID: 32943593] [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] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION Non-thyroidal illness is prevalent in patients with advanced stages of chronic kidney disease and could be considered as a risk factor for cardiovascular mortality; this relation is partially explained by malnutrition and the concomitant condition of high inflammation. This study is designed to investigate the relationship between left ventricular mass and thyroid hormone abnormalities and evaluate this relationship after adjustment of inflammatory factors and nutritional status in peritoneal dialysis patients. METHODS A total of 71 patients undergoing maintenance peritoneal dialysis were included. Serum concentration of total and free triiodothyronine (fT3), total and free thyroxine (fT4), and TSH were measured. LV mass index and the structural properties of heart including LVEDD, LVESD, PWD, and EF were assessed by transthoracic echocardiography. The Surrogates of Inflammation, including IL-6, albumin, and hs-CRP were measured. The nutritional status of patients was assessed by one point SGA scoring and biochemical data. The relation between thyroid hormones and echocardiographic variables, inflammatory and nutritional markers was determined. RESULTS LVMI was significantly higher in the group with lower fT3 levels. Linear regression analyses showed statistically significant univariate association between fT3, tT3, and tT4; and LVMI. In multiple linear regression analysis adjusted for albumin, hs-CRP, IL- 6, and ferritin; only fT3 level had a meaningful negative correlation (P < .05) with LVMI, free T3 level was positively correlated with rGFR (P < .05, c = 0.39) and KT/V (P < .05, c = 0.27). CONCLUSION Low fT3 level was negatively and significantly associated with LVML even after adjustments for known risk factors in peritoneal dialysis patients.
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50
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Goulding AT, Farrell AP. The effect of temperature acclimation on the force-frequency relationship and adrenergic sensitivity of the ventricle of two populations of juvenile sockeye salmon. J Comp Physiol B 2020; 190:717-730. [PMID: 32770260 DOI: 10.1007/s00360-020-01299-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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 06/08/2020] [Accepted: 07/15/2020] [Indexed: 11/26/2022]
Abstract
We tested the hypothesis that cardiorespiratory differences known to exist among adult sockeye salmon populations also exist in the juveniles. To test this hypothesis, we compared cardiac contractility and adrenergic responsiveness of juvenile sockeye salmon from two geographically isolated populations that were reared from eggs under common garden conditions and at two acclimation temperatures (5 °C and 14 °C). However, we found no substantive differences in the force-frequency response (FFR) and the cardiac pumping capacity of juveniles from Weaver Creek and Chilko River populations, even when we considered wild-reared juveniles from one of the populations. An unexpected discovery for all fish groups at 5 °C was a rather flat FFR during tonic β-adrenergic stimulation (βAR) stimulation. Curiously, while active tension nearly doubled with maximum βAR stimulation at low pacing frequencies for all fish groups, a negative FFR with maximum βAR stimulation meant that this inotropic benefit was lost at the highest pacing frequency (0.8 Hz). Active tension with tonic βAR stimulation was similar at 14 °C, but maximum pacing frequency doubled and all fish groups displayed a modest negative FFR. Maximum βAR stimulation again doubled active tension and this benefit was retained even at the highest pacing frequency (1.6 Hz) at 14 °C. Even though subtle population differences were apparent for the FFR and pumping capacity, their biological significance is unclear. What is clear, however, is that the cardiac pumping capacity of juvenile sockeye would benefit more from βAR stimulation swimming at 15 °C than when swimming at 5 °C.
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Affiliation(s)
- A T Goulding
- Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada.
| | - A P Farrell
- Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada
- Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z4, Canada
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