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Trogisch FA, Abouissa A, Keles M, Birke A, Fuhrmann M, Dittrich GM, Weinzierl N, Wink E, Cordero J, Elsherbiny A, Martin-Garrido A, Grein S, Hemanna S, Hofmann E, Nicin L, Bibli SI, Airik R, Kispert A, Kist R, Quanchao S, Kürschner SW, Winkler M, Gretz N, Mogler C, Korff T, Koch PS, Dimmeler S, Dobreva G, Heineke J. Endothelial cells drive organ fibrosis in mice by inducing expression of the transcription factor SOX9. Sci Transl Med 2024; 16:eabq4581. [PMID: 38416842 DOI: 10.1126/scitranslmed.abq4581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 01/24/2024] [Indexed: 03/01/2024]
Abstract
Fibrosis is a hallmark of chronic disease. Although fibroblasts are involved, it is unclear to what extent endothelial cells also might contribute. We detected increased expression of the transcription factor Sox9 in endothelial cells in several different mouse fibrosis models. These models included systolic heart failure induced by pressure overload, diastolic heart failure induced by high-fat diet and nitric oxide synthase inhibition, pulmonary fibrosis induced by bleomycin treatment, and liver fibrosis due to a choline-deficient diet. We also observed up-regulation of endothelial SOX9 in cardiac tissue from patients with heart failure. To test whether SOX9 induction was sufficient to cause disease, we generated mice with endothelial cell-specific overexpression of Sox9, which promoted fibrosis in multiple organs and resulted in signs of heart failure. Endothelial Sox9 deletion prevented fibrosis and organ dysfunction in the two mouse models of heart failure as well as in the lung and liver fibrosis mouse models. Bulk and single-cell RNA sequencing of mouse endothelial cells across multiple vascular beds revealed that SOX9 induced extracellular matrix, growth factor, and inflammatory gene expression, leading to matrix deposition by endothelial cells. Moreover, mouse endothelial cells activated neighboring fibroblasts that then migrated and deposited matrix in response to SOX9, a process partly mediated by the secreted growth factor CCN2, a direct SOX9 target; endothelial cell-specific Sox9 deletion reversed these changes. These findings suggest a role for endothelial SOX9 as a fibrosis-promoting factor in different mouse organs during disease and imply that endothelial cells are an important regulator of fibrosis.
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Affiliation(s)
- Felix A Trogisch
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
- CFPM (Core Facility Platform Mannheim), Cardiac Imaging Center, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Aya Abouissa
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
- CFPM (Core Facility Platform Mannheim), Cardiac Imaging Center, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Merve Keles
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
- CFPM (Core Facility Platform Mannheim), Cardiac Imaging Center, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Anne Birke
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Manuela Fuhrmann
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Gesine M Dittrich
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
| | - Nina Weinzierl
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Elvira Wink
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Julio Cordero
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
- ECAS, Department of Cardiovascular Genomics and Epigenomics, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Adel Elsherbiny
- ECAS, Department of Cardiovascular Genomics and Epigenomics, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Abel Martin-Garrido
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Steve Grein
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
| | - Shruthi Hemanna
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
| | - Ellen Hofmann
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Luka Nicin
- Institute for Cardiovascular Regeneration, Goethe University Frankfurt, 60590 Frankfurt am Main, Germany
- Cardiopulmonary Institute, Goethe University Frankfurt, 60590 Frankfurt am Main, Germany
- DZHK, partner site Frankfurt Rhine-Main, Frankfurt, 60590 Frankfurt am Main, Germany
| | - Sofia-Iris Bibli
- Cardiopulmonary Institute, Goethe University Frankfurt, 60590 Frankfurt am Main, Germany
- DZHK, partner site Frankfurt Rhine-Main, Frankfurt, 60590 Frankfurt am Main, Germany
- Institute of Vascular Signaling, Centre for Molecular Medicine, Goethe University Frankfurt, 60590 Frankfurt am Main, Germany
| | - Rannar Airik
- Institute of Molecular Biology, Hannover Medical School, 30625 Hannover, Germany
| | - Andreas Kispert
- Institute of Molecular Biology, Hannover Medical School, 30625 Hannover, Germany
| | - Ralf Kist
- School of Dental Sciences, Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4BW, UK
| | - Sun Quanchao
- Medical Research Center, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Sina W Kürschner
- Department of Dermatology, Venereology and Allergology, University Medical Center and Medical Faculty Mannheim, Heidelberg University, and Center of Excellence in Dermatology, 68167 Mannheim, Germany
- ECAS, Adjunct Faculty, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Manuel Winkler
- Department of Dermatology, Venereology and Allergology, University Medical Center and Medical Faculty Mannheim, Heidelberg University, and Center of Excellence in Dermatology, 68167 Mannheim, Germany
- ECAS, Adjunct Faculty, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Norbert Gretz
- Medical Research Center, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Carolin Mogler
- Institute of Pathology, School of Medicine, Technical University of Munich, 81675 Munich, Germany
| | - Thomas Korff
- ECAS, Adjunct Faculty, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- Department of Cardiovascular Physiology, Heidelberg University, 69120 Heidelberg, Germany
| | - Philipp-Sebastian Koch
- Department of Dermatology, Venereology and Allergology, University Medical Center and Medical Faculty Mannheim, Heidelberg University, and Center of Excellence in Dermatology, 68167 Mannheim, Germany
- ECAS, Adjunct Faculty, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Stefanie Dimmeler
- Institute for Cardiovascular Regeneration, Goethe University Frankfurt, 60590 Frankfurt am Main, Germany
- Cardiopulmonary Institute, Goethe University Frankfurt, 60590 Frankfurt am Main, Germany
- DZHK, partner site Frankfurt Rhine-Main, Frankfurt, 60590 Frankfurt am Main, Germany
| | - Gergana Dobreva
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
- ECAS, Department of Cardiovascular Genomics and Epigenomics, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
| | - Joerg Heineke
- ECAS (European Center for Angioscience), Department of Cardiovascular Physiology, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
- DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, 68167 Mannheim, Germany
- CFPM (Core Facility Platform Mannheim), Cardiac Imaging Center, Mannheim Faculty of Medicine, Heidelberg University, 68167 Mannheim, Germany
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2
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Kmietczyk V, Oelschläger J, Gupta P, Varma E, Hartl S, Furkel J, Konstandin M, Marx A, Loewenthal Z, Kamuf-Schenk V, Jürgensen L, Stroh C, Gorska A, Martin-Garrido A, Heineke J, Jakobi T, Frey N, Völkers M. Ythdf2 regulates cardiac remodeling through its mRNA target transcripts. J Mol Cell Cardiol 2023; 181:57-66. [PMID: 37315764 DOI: 10.1016/j.yjmcc.2023.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 05/12/2023] [Accepted: 06/08/2023] [Indexed: 06/16/2023]
Abstract
m6A mRNA methylation controls cardiomyocyte function and increased overall m6A levels are a stereotyping finding in heart failure independent of the underlying etiology. However, it is largely unknown how the information is read by m6A reader proteins in heart failure. Here we show that the m6A reader protein Ythdf2 controls cardiac function and identified a novel mechanism how reader proteins control gene expression and cardiac function. Deletion of Ythdf2 in cardiomyocytes in vivo leads to mild cardiac hypertrophy, reduced heart function, and increased fibrosis during pressure overload as well as during aging. Similarly, in vitro the knockdown of Ythdf2 results in cardiomyocyte growth and remodeling. Mechanistically, we identified the eucaryotic elongation factor 2 as post-transcriptionally regulated by Ythdf2 using cell type specific Ribo-seq data. Our study expands our understanding on the regulatory functions of m6A methylation in cardiomyocytes and how cardiac function is controlled by the m6A reader protein Ythdf2.
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Affiliation(s)
- V Kmietczyk
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - J Oelschläger
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - P Gupta
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - E Varma
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - S Hartl
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - J Furkel
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - M Konstandin
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - A Marx
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - Z Loewenthal
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - V Kamuf-Schenk
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - L Jürgensen
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - C Stroh
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - A Gorska
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - A Martin-Garrido
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany; Department of Cardiovascular Physiology, European Center for Angioscience (ECAS), Medical Faculty Mannheim of Heidelberg University
| | - J Heineke
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany; Department of Cardiovascular Physiology, European Center for Angioscience (ECAS), Medical Faculty Mannheim of Heidelberg University
| | - T Jakobi
- Department of Internal Medicine and the Translational Cardiovascular Research Center, University of Arizona, College of Medicine - Phoenix, Phoenix, USA
| | - N Frey
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - M Völkers
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, 69120 Heidelberg, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany.
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3
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Martin-Garrido A, Biesiadecki BJ, Salhi HE, Shaifta Y, Dos Remedios CG, Ayaz-Guner S, Cai W, Ge Y, Avkiran M, Kentish JC. Monophosphorylation of cardiac troponin-I at Ser-23/24 is sufficient to regulate cardiac myofibrillar Ca 2+ sensitivity and calpain-induced proteolysis. J Biol Chem 2018; 293:8588-8599. [PMID: 29669813 PMCID: PMC5986213 DOI: 10.1074/jbc.ra117.001292] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 04/04/2018] [Indexed: 01/03/2023] Open
Abstract
The acceleration of myocardial relaxation produced by β-adrenoreceptor stimulation is mediated in part by protein kinase A (PKA)-mediated phosphorylation of cardiac troponin-I (cTnI), which decreases myofibrillar Ca2+ sensitivity. Previous evidence suggests that phosphorylation of both Ser-23 and Ser-24 in cTnI is required for this Ca2+ desensitization. PKA-mediated phosphorylation also partially protects cTnI from proteolysis by calpain. Here we report that protein kinase D (PKD) phosphorylates only one serine of cTnI Ser-23/24. To explore the functional consequences of this monophosphorylation, we examined the Ca2+ sensitivity of force production and susceptibility of cTnI to calpain-mediated proteolysis when Ser-23/24 of cTnI in mouse cardiac myofibrils was nonphosphorylated, mono-phosphorylated, or bisphosphorylated (using sequential incubations in λ-phosphatase, PKD, and PKA, respectively). Phos-tag gels, Western blotting, and high-resolution MS revealed that PKD produced >90% monophosphorylation of cTnI, primarily at Ser-24, whereas PKA led to cTnI bisphosphorylation exclusively. PKD markedly decreased the Ca2+ sensitivity of force production in detergent-permeabilized ventricular trabeculae, whereas subsequent incubation with PKA produced only a small further fall of Ca2+ sensitivity. Unlike PKD, PKA also substantially phosphorylated myosin-binding protein-C and significantly accelerated cross-bridge kinetics (ktr). After phosphorylation by PKD or PKA, cTnI in isolated myofibrils was partially protected from calpain-mediated degradation. We conclude that cTnI monophosphorylation at Ser-23/24 decreases myofibrillar Ca2+ sensitivity and partially protects cTnI from calpain-induced proteolysis. In healthy cardiomyocytes, the basal monophosphorylation of cTnI may help tonically regulate myofibrillar Ca2+ sensitivity.
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Affiliation(s)
- Abel Martin-Garrido
- From the King's College London British Heart Foundation Centre of Excellence, School of Cardiovascular Medicine and Sciences, London SE1 7EH, United Kingdom
| | - Brandon J Biesiadecki
- the Department of Physiology and Cell Biology, Davis Heart and Lung Research Institute, Ohio State University, Columbus, Ohio 43210
| | - Hussam E Salhi
- the Department of Physiology and Cell Biology, Davis Heart and Lung Research Institute, Ohio State University, Columbus, Ohio 43210
| | - Yasin Shaifta
- From the King's College London British Heart Foundation Centre of Excellence, School of Cardiovascular Medicine and Sciences, London SE1 7EH, United Kingdom
| | - Cristobal G Dos Remedios
- the Bosch Institute, Discipline of Anatomy and Histology, University of Sydney, New South Wales 2006, Australia, and
| | | | - Wenxuan Cai
- the Departments of Cell and Regenerative Biology and.,Molecular and Cellular Pharmacology Training Program, and
| | - Ying Ge
- the Departments of Cell and Regenerative Biology and.,Human Proteomics Program, University of Wisconsin, Madison, Wisconsin 53705.,Chemistry
| | - Metin Avkiran
- From the King's College London British Heart Foundation Centre of Excellence, School of Cardiovascular Medicine and Sciences, London SE1 7EH, United Kingdom,
| | - Jonathan C Kentish
- From the King's College London British Heart Foundation Centre of Excellence, School of Cardiovascular Medicine and Sciences, London SE1 7EH, United Kingdom,
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Kentish JC, Martin-Garrido A, Biesiadecki BJ, Salhi HE, Shaifta Y, Dos Remedios C, Ayaz-Guner S, Cai W, Ge Y, Avkiran M. P457Monophosphorylation of cardiac troponin-I at Ser23/24 regulates cardiac myofibrillar Ca2+ sensitivity and modulates calpain-induced proteolysis. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy060.316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- J C Kentish
- King's College London, Cardiovascular Division, London, United Kingdom
| | - A Martin-Garrido
- King's College London, Cardiovascular Division, London, United Kingdom
| | | | - H E Salhi
- Ohio State University, Ohio, United States of America
| | - Y Shaifta
- King's College London, Cardiovascular Division, London, United Kingdom
| | | | - S Ayaz-Guner
- University of Wisconsin-Madison, Madison, United States of America
| | - W Cai
- University of Wisconsin-Madison, Madison, United States of America
| | - Y Ge
- University of Wisconsin-Madison, Madison, United States of America
| | - M Avkiran
- King's College London, Cardiovascular Division, London, United Kingdom
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Tarkin JM, Joshi FR, Evans NR, Chowdhury MM, Figg NL, Shah AV, Starks LT, Martin-Garrido A, Manavaki R, Yu E, Kuc RE, Grassi L, Kreuzhuber R, Kostadima MA, Frontini M, Kirkpatrick PJ, Coughlin PA, Gopalan D, Fryer TD, Buscombe JR, Groves AM, Ouwehand WH, Bennett MR, Warburton EA, Davenport AP, Rudd JHF. Detection of Atherosclerotic Inflammation by 68Ga-DOTATATE PET Compared to [ 18F]FDG PET Imaging. J Am Coll Cardiol 2017; 69:1774-1791. [PMID: 28385306 PMCID: PMC5381358 DOI: 10.1016/j.jacc.2017.01.060] [Citation(s) in RCA: 281] [Impact Index Per Article: 40.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 01/04/2017] [Accepted: 01/20/2017] [Indexed: 10/25/2022]
Abstract
BACKGROUND Inflammation drives atherosclerotic plaque rupture. Although inflammation can be measured using fluorine-18-labeled fluorodeoxyglucose positron emission tomography ([18F]FDG PET), [18F]FDG lacks cell specificity, and coronary imaging is unreliable because of myocardial spillover. OBJECTIVES This study tested the efficacy of gallium-68-labeled DOTATATE (68Ga-DOTATATE), a somatostatin receptor subtype-2 (SST2)-binding PET tracer, for imaging atherosclerotic inflammation. METHODS We confirmed 68Ga-DOTATATE binding in macrophages and excised carotid plaques. 68Ga-DOTATATE PET imaging was compared to [18F]FDG PET imaging in 42 patients with atherosclerosis. RESULTS Target SSTR2 gene expression occurred exclusively in "proinflammatory" M1 macrophages, specific 68Ga-DOTATATE ligand binding to SST2 receptors occurred in CD68-positive macrophage-rich carotid plaque regions, and carotid SSTR2 mRNA was highly correlated with in vivo 68Ga-DOTATATE PET signals (r = 0.89; 95% confidence interval [CI]: 0.28 to 0.99; p = 0.02). 68Ga-DOTATATE mean of maximum tissue-to-blood ratios (mTBRmax) correctly identified culprit versus nonculprit arteries in patients with acute coronary syndrome (median difference: 0.69; interquartile range [IQR]: 0.22 to 1.15; p = 0.008) and transient ischemic attack/stroke (median difference: 0.13; IQR: 0.07 to 0.32; p = 0.003). 68Ga-DOTATATE mTBRmax predicted high-risk coronary computed tomography features (receiver operating characteristics area under the curve [ROC AUC]: 0.86; 95% CI: 0.80 to 0.92; p < 0.0001), and correlated with Framingham risk score (r = 0.53; 95% CI: 0.32 to 0.69; p <0.0001) and [18F]FDG uptake (r = 0.73; 95% CI: 0.64 to 0.81; p < 0.0001). [18F]FDG mTBRmax differentiated culprit from nonculprit carotid lesions (median difference: 0.12; IQR: 0.0 to 0.23; p = 0.008) and high-risk from lower-risk coronary arteries (ROC AUC: 0.76; 95% CI: 0.62 to 0.91; p = 0.002); however, myocardial [18F]FDG spillover rendered coronary [18F]FDG scans uninterpretable in 27 patients (64%). Coronary 68Ga-DOTATATE PET scans were readable in all patients. CONCLUSIONS We validated 68Ga-DOTATATE PET as a novel marker of atherosclerotic inflammation and confirmed that 68Ga-DOTATATE offers superior coronary imaging, excellent macrophage specificity, and better power to discriminate high-risk versus low-risk coronary lesions than [18F]FDG. (Vascular Inflammation Imaging Using Somatostatin Receptor Positron Emission Tomography [VISION]; NCT02021188).
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Affiliation(s)
- Jason M Tarkin
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | | | - Nicholas R Evans
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom
| | - Mohammed M Chowdhury
- Department of Vascular and Endovascular Surgery, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Nichola L Figg
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Aarti V Shah
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Lakshi T Starks
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Abel Martin-Garrido
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Roido Manavaki
- Department of Radiology, University of Cambridge, Cambridge, United Kingdom
| | - Emma Yu
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Rhoda E Kuc
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom
| | - Luigi Grassi
- Department of Hematology, University of Cambridge, and National Health Service Blood and Transport, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | - Roman Kreuzhuber
- Department of Hematology, University of Cambridge, and National Health Service Blood and Transport, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | - Myrto A Kostadima
- Department of Hematology, University of Cambridge, and National Health Service Blood and Transport, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | - Mattia Frontini
- Department of Hematology, University of Cambridge, and National Health Service Blood and Transport, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | | | - Patrick A Coughlin
- Department of Vascular and Endovascular Surgery, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Deepa Gopalan
- Department of Radiology, University of Cambridge, Cambridge, United Kingdom; Department of Radiology, Hammersmith Hospital, London, United Kingdom
| | - Tim D Fryer
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom
| | - John R Buscombe
- Department of Nuclear Medicine, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Ashley M Groves
- Institute of Nuclear Medicine, University College London, London, United Kingdom
| | - Willem H Ouwehand
- Department of Hematology, University of Cambridge, and National Health Service Blood and Transport, Cambridge Biomedical Campus, Cambridge, United Kingdom; Department of Human Genetics, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, United Kingdom
| | - Martin R Bennett
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Elizabeth A Warburton
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom
| | - Anthony P Davenport
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom
| | - James H F Rudd
- Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom.
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Tarkin JM, Joshi FR, Evans NR, Chowdhury MM, Figg NL, Shah AV, Starks LT, Martin-Garrido A, Manavaki R, Yu E, Kuc RE, Grassi L, Kreuzhuber R, Kostadima MA, Frontini M, Kirkpatrick PJ, Coughlin PA, Gopalan D, Fryer TD, Buscombe JR, Groves AM, Ouwehand WH, Bennett MR, Warburton EA, Davenport AP, Rudd JHF. D Atherosclerotic inflammation imaging using 68ga-dotatate pet vs. 18f-fdg pet: a prospective clinical sudy with molecular and histological validation. Heart 2017. [DOI: 10.1136/heartjnl-2017-311726.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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7
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Lee M, San Martín A, Valdivia A, Martin-Garrido A, Griendling KK. Redox-Sensitive Regulation of Myocardin-Related Transcription Factor (MRTF-A) Phosphorylation via Palladin in Vascular Smooth Muscle Cell Differentiation Marker Gene Expression. PLoS One 2016; 11:e0153199. [PMID: 27088725 PMCID: PMC4835087 DOI: 10.1371/journal.pone.0153199] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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: 08/27/2015] [Accepted: 03/24/2016] [Indexed: 01/18/2023] Open
Abstract
Vascular smooth muscle cells (VSMCs) undergo a phenotypic switch from a differentiated to synthetic phenotype in cardiovascular diseases such as atherosclerosis and restenosis. Our previous studies indicate that transforming growth factor-β (TGF-β) helps to maintain the differentiated phenotype by regulating expression of pro-differentiation genes such as smooth muscle α-actin (SMA) and Calponin (CNN) through reactive oxygen species (ROS) derived from NADPH oxidase 4 (Nox4) in VSMCs. In this study, we investigated the relationship between Nox4 and myocardin-related transcription factor-A (MRTF-A), a transcription factor known to be important in expression of smooth muscle marker genes. Previous work has shown that MRTF-A interacts with the actin-binding protein, palladin, although how this interaction affects MRTF-A function is unclear, as is the role of phosphorylation in MRTF-A activity. We found that Rho kinase (ROCK)-mediated phosphorylation of MRTF-A is a key event in the regulation of SMA and CNN in VSMCs and that this phosphorylation depends upon Nox4-mediated palladin expression. Knockdown of Nox4 using siRNA decreases TGF-β -induced palladin expression and MRTF-A phosphorylation, suggesting redox-sensitive regulation of this signaling pathway. Knockdown of palladin also decreases MRTF-A phosphorylation. These data suggest that Nox4-dependent palladin expression and ROCK regulate phosphorylation of MRTF-A, a critical factor in the regulation of SRF responsive gene expression.
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Affiliation(s)
- Minyoung Lee
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United Sates of America
| | - Alejandra San Martín
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United Sates of America
| | - Alejandra Valdivia
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United Sates of America
| | - Abel Martin-Garrido
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United Sates of America
| | - Kathy K. Griendling
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United Sates of America
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Fernandez I, Martin-Garrido A, Zhou DW, Clempus RE, Seidel-Rogol B, Valdivia A, Lassègue B, García AJ, Griendling KK, San Martin A. Hic-5 Mediates TGFβ-Induced Adhesion in Vascular Smooth Muscle Cells by a Nox4-Dependent Mechanism. Arterioscler Thromb Vasc Biol 2015; 35:1198-206. [PMID: 25814672 DOI: 10.1161/atvbaha.114.305185] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 03/16/2015] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Focal adhesions (FAs) link the cytoskeleton to the extracellular matrix and as such play important roles in growth, migration, and contractile properties of vascular smooth muscle cells. Recently, it has been shown that downregulation of Nox4, a transforming growth factor (TGF) β-inducible, hydrogen peroxide (H2O2)-producing enzyme, affects the number of FAs. However, the effectors downstream of Nox4 that mediate FA regulation are unknown. The FA resident protein H2O2-inducible clone (Hic)-5 is H2O2 and TGFβ inducible, and a binding partner of the heat shock protein (Hsp) 27. The objective of this study was to elucidate the mechanism, by which Hic-5 and Hsp27 participate in TGFβ-induced, Nox4-mediated vascular smooth muscle cell adhesion and migration. APPROACH AND RESULTS Through a combination of molecular biology and biochemistry techniques, we found that TGFβ, by a Nox4-dependent mechanism, induces the expression and interaction of Hic-5 and Hsp27, which is essential for Hic-5 localization to FAs. Importantly, we found that Hic-5 expression is required for the TGFβ-mediated increase in FA number, adhesive forces and migration. Mechanistically, Nox4 downregulation impedes Smad (small body size and mothers against decapentaplegic) signaling by TGFβ, and Hsp27 and Hic-5 upregulation by TGFβ is blocked in small body size and mothers against decapentaplegic 4-deficient cells. CONCLUSIONS Hic-5 and Hsp27 are effectors of Nox4 required for TGFβ-stimulated FA formation, adhesion strength and migration in vascular smooth muscle cell.
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Affiliation(s)
- Isabel Fernandez
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Abel Martin-Garrido
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Dennis W Zhou
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Roza E Clempus
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Bonnie Seidel-Rogol
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Alejandra Valdivia
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Bernard Lassègue
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Andrés J García
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
| | - Kathy K Griendling
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.).
| | - Alejandra San Martin
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA (I.F., A.M.-G., R.E.C., B.S.-R., A.V., B.L., K.K.G., A.S.M.); and Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta (D.W.Z., A.J.G.)
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Martin-Garrido A, Williams HC, Lee M, Seidel-Rogol B, Ci X, Dong JT, Lassègue B, Martín AS, Griendling KK. Transforming growth factor β inhibits platelet derived growth factor-induced vascular smooth muscle cell proliferation via Akt-independent, Smad-mediated cyclin D1 downregulation. PLoS One 2013; 8:e79657. [PMID: 24236150 PMCID: PMC3827379 DOI: 10.1371/journal.pone.0079657] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [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: 04/22/2013] [Accepted: 10/04/2013] [Indexed: 11/18/2022] Open
Abstract
In adult tissue, vascular smooth muscle cells (VSMCs) exist in a differentiated phenotype, which is defined by the expression of contractile proteins and lack of proliferation. After vascular injury, VSMC adopt a synthetic phenotype associated with proliferation, migration and matrix secretion. The transition between phenotypes is a consequence of the extracellular environment, and in particular, is regulated by agonists such as the pro-differentiating cytokine transforming growth factor β (TGFβ) and the pro-proliferative cytokine platelet derived growth factor (PDGF). In this study, we investigated the interplay between TGFβ and PDGF with respect to their ability to regulate VSMC proliferation. Stimulation of human aortic VSMC with TGFβ completely blocked proliferation induced by all isoforms of PDGF, as measured by DNA synthesis and total cell number. Mechanistically, PDGF-induced Cyclin D1 mRNA and protein expression was inhibited by TGFβ. TGFβ had no effect on PDGF activation of its receptor and ERK1/2, but inhibited Akt activation. However, constitutively active Akt did not reverse the inhibitory effect of TGFβ on Cyclin D1 expression even though inhibition of the proteasome blocked the effect of TGFβ. siRNA against Smad4 completely reversed the inhibitory effect of TGFβ on PDGF-induced Cyclin D1 expression and restored proliferation in response to PDGF. Moreover, siRNA against KLF5 prevented Cyclin D1 upregulation by PDGF and overexpression of KLF5 partially reversed TGFβ-induced inhibition of Cyclin D1 expression. Taken together, our results demonstrate that KLF5 is required for PDGF-induced Cyclin D1 expression, which is inhibited by TGFβ via a Smad dependent mechanism, resulting in arrest of VSMCs in the G1 phase of the cell cycle.
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Affiliation(s)
- Abel Martin-Garrido
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
| | - Holly C. Williams
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
| | - Minyoung Lee
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
| | - Bonnie Seidel-Rogol
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
| | - Xinpei Ci
- Winship Cancer Institute, Department of Hematology and Medical Oncology, Emory University, Atlanta, Georgia, United States of America
| | - Jin-Tang Dong
- Winship Cancer Institute, Department of Hematology and Medical Oncology, Emory University, Atlanta, Georgia, United States of America
| | - Bernard Lassègue
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
| | - Alejandra San Martín
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
| | - Kathy K. Griendling
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia, United States of America
- * E-mail:
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Martin-Garrido A, Brown DI, Lyle AN, Dikalova A, Seidel-Rogol B, Lassègue B, San Martín A, Griendling KK. NADPH oxidase 4 mediates TGF-β-induced smooth muscle α-actin via p38MAPK and serum response factor. Free Radic Biol Med 2011; 50:354-62. [PMID: 21074607 PMCID: PMC3032946 DOI: 10.1016/j.freeradbiomed.2010.11.007] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [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: 03/30/2010] [Revised: 10/12/2010] [Accepted: 11/04/2010] [Indexed: 12/18/2022]
Abstract
In contrast to other cell types, vascular smooth muscle cells modify their phenotype in response to external signals. NADPH oxidase 4 (Nox4) is critical for maintenance of smooth muscle gene expression; however, the underlying mechanisms are incompletely characterized. Using smooth muscle α-actin (SMA) as a prototypical smooth muscle gene and transforming growth factor-β (TGF-β) as a differentiating agent, we examined Nox4-dependent signaling. TGF-β increases Nox4 expression and activity in human aortic smooth muscle cells (HASMC). Transfection of HASMC with siRNA against Nox4 (siNox4) abolishes TGF-β-induced SMA expression and stress fiber formation. siNox4 also significantly inhibits TGF-β-stimulated p38MAPK phosphorylation, as well as that of its substrate, mitogen-activated protein kinase-activated protein kinase-2. Moreover, the p38MAPK inhibitor SB-203580 nearly completely blocks the SMA increase induced by TGF-β. Inhibition of either p38MAPK or NADPH oxidase-derived reactive oxygen species impairs the TGF-β-induced phosphorylation of Ser103 on serum response factor (SRF) and reduces its transcriptional activity. Binding of SRF to myocardin-related transcription factor (MRTF) is also necessary, because downregulation of MRTF by siRNA abolishes TGF-β-induced SMA expression. Taken together, these data suggest that Nox4 regulates SMA expression via activation of a p38MAPK/SRF/MRTF pathway in response to TGF-β.
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Affiliation(s)
- Abel Martin-Garrido
- Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA 30322, USA
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Engberding N, San Martín A, Martin-Garrido A, Koga M, Pounkova L, Lyons E, Lassègue B, Griendling KK. Insulin-like growth factor-1 receptor expression masks the antiinflammatory and glucose uptake capacity of insulin in vascular smooth muscle cells. Arterioscler Thromb Vasc Biol 2009; 29:408-15. [PMID: 19122171 DOI: 10.1161/atvbaha.108.181727] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Insulin resistance of vascular smooth muscle cells (VSMCs) has been linked to accelerated atherosclerosis in diabetes; however, the effects of insulin on VSMCs remain controversial. Most VSMC insulin receptors are sequestered into insulin-insensitive hybrids with insulin-like growth factor-1 receptors (IGF1Rs). Thus we hypothesized that regulation of IGF1R expression may impact cellular insulin sensitivity. METHODS AND RESULTS IGF1R expression was increased in aortas from diabetic mice. IGF1R overexpression in VSMCs impaired insulin-induced Akt phosphorylation. Conversely, IGF1R downregulation by siRNA allowed assembly of insulin holoreceptors, enhanced insulin-induced phosphorylation of its receptor, Akt, Erk1/2, and further augmented insulin-induced glucose uptake. IGF1R downregulation uncovered an insulin-induced reduction in activation of NF-kappaB and inhibition of MCP-1 upregulation in response to TNF-alpha. CONCLUSIONS Downregulation of IGF1R increases the fraction of insulin receptors organized in holoreceptors, which leads to enhanced insulin signaling and unmasks potential antiinflammatory properties of insulin in VSMCs. Therefore, IGF1R, which is susceptible to feedback regulation by its own ligand, may represent a novel target for interventions designed to treat insulin resistance in the vasculature.
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Affiliation(s)
- Niels Engberding
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA 30322, USA
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