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Ghosh M, Khanam R, Sengupta A, Chakraborty S. Oxidative-stress induced Bmp2-Smad1/5/8 signaling dependent differentiation of early cardiomyocytes from embryonic and adult epicardial cells. Differentiation 2024; 136:100756. [PMID: 38471281 DOI: 10.1016/j.diff.2024.100756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 02/15/2024] [Accepted: 02/17/2024] [Indexed: 03/14/2024]
Abstract
Heart failure has become a major life-threatening cause affecting millions globally, characterized by the permanent loss of adult functional cardiomyocytes leading to fibrosis which ultimately deprives the heart of its functional efficacy. Here we investigated the reparative property of embryonic and adult epicardial cells towards cardiomyocyte differentiation under oxidative stress-induced conditions along with the identification of a possible molecular signaling pathway. Isolated epicardial cells from embryonic chick hearts subjected to oxidative stress and hypoxia induction. Initial assessment of successful injury induction reveals hypertrophy of isolated epicardial cells. Detailed marker gene expression analyses and inhibitor studies reveal Bone morphogenic protein (Bmp)2-Smad1/5/8 signaling dependent cardiomyocyte lineage specification via epithelial to mesenchymal transition (EMT) post-injury. EMT is further confirmed by increased proliferation, migration, and differentiation towards cardiomyocyte lineage. We have also established an in-vivo model in adult male rats using Isoproterenol. Successful oxidative stress-mediated injury induction in adult heart was marked by increased activated fibroblasts followed by apoptosis of adult cardiomyocytes. The detailed characterization of adult epicardial cells reveals similar findings to our avian in-vitro data. Both in-vitro and in-vivo results show a significant increase in the expression of cardiomyocyte specific markers indicative of lineage specificity and activation of epicardial cells post oxidative stress mediated injury. Our findings suggest an EMT-induced reactivation of epicardial cells and early cardiomyocyte lineage specification following oxidative stress in a Bmp2- Smad1/5/8 dependent manner. Overall, this regulatory mechanism of cardiomyocyte differentiation induced by oxidative stress may contribute to the field of cardiac repair and regenerative therapeutics.
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Affiliation(s)
- Madhurima Ghosh
- Department of Life Sciences, Presidency University, Kolkata, 700073, India
| | - Riffat Khanam
- Department of Life Sciences, Presidency University, Kolkata, 700073, India
| | - Arunima Sengupta
- Department of Life Science and Biotechnology, Jadavpur University, Kolkata, 700032, India
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Cao C, Li L, Zhang Q, Li H, Wang Z, Wang A, Liu J. Nkx2.5: a crucial regulator of cardiac development, regeneration and diseases. Front Cardiovasc Med 2023; 10:1270951. [PMID: 38124890 PMCID: PMC10732152 DOI: 10.3389/fcvm.2023.1270951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 11/20/2023] [Indexed: 12/23/2023] Open
Abstract
Cardiomyocytes fail to regenerate after birth and respond to mitotic signals through cellular hypertrophy rather than cellular proliferation. Necrotic cardiomyocytes in the infarcted ventricular tissue are eventually replaced by fibroblasts, generating scar tissue. Cardiomyocyte loss causes localized systolic dysfunction. Therefore, achieving the regeneration of cardiomyocytes is of great significance for cardiac function and development. Heart development is a complex biological process. An integral cardiac developmental network plays a decisive role in the regeneration of cardiomyocytes. During this process, genetic epigenetic factors, transcription factors, signaling pathways and small RNAs are involved in regulating the developmental process of the heart. Cardiomyocyte-specific genes largely promote myocardial regeneration, among which the Nkx2.5 transcription factor is one of the earliest markers of cardiac progenitor cells, and the loss or overexpression of Nkx2.5 affects cardiac development and is a promising candidate factor. Nkx2.5 affects the development and function of the heart through its multiple functional domains. However, until now, the specific mechanism of Nkx2.5 in cardiac development and regeneration is not been fully understood. Therefore, this article will review the molecular structure, function and interaction regulation of Nkx2.5 to provide a new direction for cardiac development and the treatment of heart regeneration.
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Affiliation(s)
- Ce Cao
- Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing Key Laboratory of Chinese Materia Pharmacology, National Clinical Research Center of Traditional Chinese Medicine for Cardiovascular Diseases, Beijing, China
- Institute of Chinese Medicine Sciences, Guangdong Pharmaceutical University, Guangzhou, China
| | - Lei Li
- Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing Key Laboratory of Chinese Materia Pharmacology, National Clinical Research Center of Traditional Chinese Medicine for Cardiovascular Diseases, Beijing, China
| | - Qian Zhang
- Institute of Chinese Medicine Sciences, Guangdong Pharmaceutical University, Guangzhou, China
| | - Haoran Li
- Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing Key Laboratory of Chinese Materia Pharmacology, National Clinical Research Center of Traditional Chinese Medicine for Cardiovascular Diseases, Beijing, China
- Institute of Chinese Medicine Sciences, Guangdong Pharmaceutical University, Guangzhou, China
| | - Ziyan Wang
- Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing Key Laboratory of Chinese Materia Pharmacology, National Clinical Research Center of Traditional Chinese Medicine for Cardiovascular Diseases, Beijing, China
| | - Aoao Wang
- Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing Key Laboratory of Chinese Materia Pharmacology, National Clinical Research Center of Traditional Chinese Medicine for Cardiovascular Diseases, Beijing, China
| | - Jianxun Liu
- Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing Key Laboratory of Chinese Materia Pharmacology, National Clinical Research Center of Traditional Chinese Medicine for Cardiovascular Diseases, Beijing, China
- Institute of Chinese Medicine Sciences, Guangdong Pharmaceutical University, Guangzhou, China
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3
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Wittmann A, Bartels A, Alkotub B, Bauer L, Kafshgari MH, Multhoff G. Chronic inflammatory effects of in vivo irradiation of the murine heart on endothelial cells mimic mechanisms involved in atherosclerosis. Strahlenther Onkol 2023; 199:1214-1224. [PMID: 37658922 PMCID: PMC10673733 DOI: 10.1007/s00066-023-02130-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 07/16/2023] [Indexed: 09/05/2023]
Abstract
PURPOSE Radiotherapy is a major pillar in the treatment of solid tumors including breast cancer. However, epidemiological studies have revealed an increase in cardiac diseases approximately a decade after exposure of the thorax to ionizing irradiation, which might be related to vascular inflammation. Therefore, chronic inflammatory effects were examined in primary heart and lung endothelial cells (ECs) of mice after local heart irradiation. METHODS Long-lasting effects on primary ECs of the heart and lung were studied 20-50 weeks after local irradiation of the heart of mice (8 and 16 Gy) in vivo by multiparameter flow cytometry using antibodies directed against cell surface markers related to proliferation, stemness, lipid metabolism, and inflammation, and compared to those induced by occlusion of the left anterior descending coronary artery. RESULTS In vivo irradiation of the complete heart caused long-lasting persistent upregulation of inflammatory (HCAM, ICAM‑1, VCAM-1), proliferation (CD105), and lipid (CD36) markers on primary heart ECs and an upregulation of ICAM‑1 and VCAM‑1 on primary ECs of the partially irradiated lung lobe. An artificially induced heart infarction induces similar effects with respect to inflammatory markers, albeit in a shorter time period. CONCLUSION The long-lasting upregulation of prominent inflammatory markers on primary heart and lung ECs suggests that local heart irradiation induces chronic inflammation in the microvasculature of the heart and partially irradiated lung that leads to cardiac injury which might be related to altered lipid metabolism in the heart.
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Affiliation(s)
- Andrea Wittmann
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technische Universität München (TUM), Munich, Germany
- Center for Translational Cancer Research (TranslaTUM), School of Medicine Radiation Immuno-Oncology Group, Klinikum rechts der Isar, Technische Universität München (TUM), Ismaningerstr. 22, 81675, Munich, Germany
| | - Anna Bartels
- Department of Nuclear Medicine, School of Medicine, Klinikum rechts der Isar, Technische Universität München (TUM), Munich, Germany
| | - Bayan Alkotub
- Institute of Biological Medical Imaging, Helmholtz-Zentrum München (HMGU), Neuherberg, Munich, Germany
| | - Lisa Bauer
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technische Universität München (TUM), Munich, Germany
- Center for Translational Cancer Research (TranslaTUM), School of Medicine Radiation Immuno-Oncology Group, Klinikum rechts der Isar, Technische Universität München (TUM), Ismaningerstr. 22, 81675, Munich, Germany
| | - Morteza Hasanzadeh Kafshgari
- Center for Translational Cancer Research (TranslaTUM), Heinz-Nixdorf-Chair for Biomedical Electronics, Klinikum rechts der Isar, Technische Universität München (TUM), Munich, Germany
| | - Gabriele Multhoff
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technische Universität München (TUM), Munich, Germany.
- Center for Translational Cancer Research (TranslaTUM), School of Medicine Radiation Immuno-Oncology Group, Klinikum rechts der Isar, Technische Universität München (TUM), Ismaningerstr. 22, 81675, Munich, Germany.
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Rogala S, Ali T, Melissari MT, Währisch S, Schuster P, Sarre A, Emídio RC, Boettger T, Rogg EM, Kaur J, Krishnan J, Dumbović G, Dimmeler S, Ounzain S, Pedrazzini T, Herrmann BG, Grote P. The lncRNA Sweetheart regulates compensatory cardiac hypertrophy after myocardial injury in murine males. Nat Commun 2023; 14:7024. [PMID: 37919291 PMCID: PMC10622434 DOI: 10.1038/s41467-023-42760-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 10/19/2023] [Indexed: 11/04/2023] Open
Abstract
After myocardial infarction in the adult heart the remaining, non-infarcted tissue adapts to compensate the loss of functional tissue. This adaptation requires changes in gene expression networks, which are mostly controlled by transcription regulating proteins. Long non-coding transcripts (lncRNAs) are taking part in fine-tuning such gene programs. We describe and characterize the cardiomyocyte specific lncRNA Sweetheart RNA (Swhtr), an approximately 10 kb long transcript divergently expressed from the cardiac core transcription factor coding gene Nkx2-5. We show that Swhtr is dispensable for normal heart development and function but becomes essential for the tissue adaptation process after myocardial infarction in murine males. Re-expressing Swhtr from an exogenous locus rescues the Swhtr null phenotype. Genes that depend on Swhtr after cardiac stress are significantly occupied and therefore most likely regulated by NKX2-5. The Swhtr transcript interacts with NKX2-5 and disperses upon hypoxic stress in cardiomyocytes, indicating an auxiliary role of Swhtr for NKX2-5 function in tissue adaptation after myocardial injury.
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Affiliation(s)
- Sandra Rogala
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Str. 42-44, 60596, Frankfurt am Main, Germany
| | - Tamer Ali
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Str. 42-44, 60596, Frankfurt am Main, Germany
- Faculty of Science, Benha University, Benha, 13518, Egypt
| | - Maria-Theodora Melissari
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Sandra Währisch
- Department of Developmental Genetics, Max Planck Institute for Molecular Genetics, Ihnestr. 63-73, 14195, Berlin, Germany
| | - Peggy Schuster
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Alexandre Sarre
- Cardiovascular Assessment Facility, University of Lausanne Medical School, Lausanne, Switzerland
| | - Rebeca Cordellini Emídio
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Thomas Boettger
- Department of Cardiac Development and Remodelling, Max Planck Institute for Heart- and Lung Research, 61231, Bad Nauheim, Germany
| | - Eva-Maria Rogg
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Jaskiran Kaur
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Jaya Krishnan
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Gabrijela Dumbović
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Stefanie Dimmeler
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany
| | - Samir Ounzain
- Experimental Cardiology Unit, Department of Cardiovascular Medicine, University of Lausanne Medical School, Lausanne, Switzerland
- HAYA Therapeutics, Rte de la Corniche 6, 1066, Lausanne, Switzerland
| | - Thierry Pedrazzini
- Experimental Cardiology Unit, Department of Cardiovascular Medicine, University of Lausanne Medical School, Lausanne, Switzerland
| | - Bernhard G Herrmann
- Department of Developmental Genetics, Max Planck Institute for Molecular Genetics, Ihnestr. 63-73, 14195, Berlin, Germany
| | - Phillip Grote
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany.
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Str. 42-44, 60596, Frankfurt am Main, Germany.
- Frankfurt Cancer Institute, Goethe University Frankfurt, Frankfurt am Main, Germany.
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Abstract
The Human Genome Project marked a major milestone in the scientific community as it unravelled the ~3 billion bases that are central to crucial aspects of human life. Despite this achievement, it only scratched the surface of understanding how each nucleotide matters, both individually and as part of a larger unit. Beyond the coding genome, which comprises only ~2% of the whole genome, scientists have realized that large portions of the genome, not known to code for any protein, were crucial for regulating the coding genes. These large portions of the genome comprise the 'non-coding genome'. The history of gene regulation mediated by proteins that bind to the regulatory non-coding genome dates back many decades to the 1960s. However, the original definition of 'enhancers' was first used in the early 1980s. In this Review, we summarize benchmark studies that have mapped the role of cardiac enhancers in disease and development. We highlight instances in which enhancer-localized genetic variants explain the missing link to cardiac pathogenesis. Finally, we inspire readers to consider the next phase of exploring enhancer-based gene therapy for cardiovascular disease.
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Hocker JD, Poirion OB, Zhu F, Buchanan J, Zhang K, Chiou J, Wang TM, Zhang Q, Hou X, Li YE, Zhang Y, Farah EN, Wang A, McCulloch AD, Gaulton KJ, Ren B, Chi NC, Preissl S. Cardiac cell type-specific gene regulatory programs and disease risk association. SCIENCE ADVANCES 2021; 7:eabf1444. [PMID: 33990324 PMCID: PMC8121433 DOI: 10.1126/sciadv.abf1444] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 03/25/2021] [Indexed: 05/07/2023]
Abstract
Misregulated gene expression in human hearts can result in cardiovascular diseases that are leading causes of mortality worldwide. However, the limited information on the genomic location of candidate cis-regulatory elements (cCREs) such as enhancers and promoters in distinct cardiac cell types has restricted the understanding of these diseases. Here, we defined >287,000 cCREs in the four chambers of the human heart at single-cell resolution, which revealed cCREs and candidate transcription factors associated with cardiac cell types in a region-dependent manner and during heart failure. We further found cardiovascular disease-associated genetic variants enriched within these cCREs including 38 candidate causal atrial fibrillation variants localized to cardiomyocyte cCREs. Additional functional studies revealed that two of these variants affect a cCRE controlling KCNH2/HERG expression and action potential repolarization. Overall, this atlas of human cardiac cCREs provides the foundation for illuminating cell type-specific gene regulation in human hearts during health and disease.
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Affiliation(s)
- James D Hocker
- Medical Scientist Training Program, University of California, San Diego, La Jolla, CA, USA
- Biomedical Sciences Graduate Program, University of California, San Diego, La Jolla, CA, USA
- Ludwig Institute for Cancer Research, La Jolla, CA, USA
| | - Olivier B Poirion
- Center for Epigenomics, University of California, San Diego, La Jolla, CA, USA
| | - Fugui Zhu
- Division of Cardiology, Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Justin Buchanan
- Center for Epigenomics, University of California, San Diego, La Jolla, CA, USA
| | - Kai Zhang
- Ludwig Institute for Cancer Research, La Jolla, CA, USA
| | - Joshua Chiou
- Biomedical Sciences Graduate Program, University of California, San Diego, La Jolla, CA, USA
- Department of Pediatrics, Pediatric Diabetes Research Center, University of California, San Diego, La Jolla, CA, USA
| | - Tsui-Min Wang
- Departments of Bioengineering and Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Qingquan Zhang
- Division of Cardiology, Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Xiaomeng Hou
- Center for Epigenomics, University of California, San Diego, La Jolla, CA, USA
| | - Yang E Li
- Ludwig Institute for Cancer Research, La Jolla, CA, USA
| | - Yanxiao Zhang
- Ludwig Institute for Cancer Research, La Jolla, CA, USA
| | - Elie N Farah
- Biomedical Sciences Graduate Program, University of California, San Diego, La Jolla, CA, USA
- Division of Cardiology, Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Allen Wang
- Center for Epigenomics, University of California, San Diego, La Jolla, CA, USA
| | - Andrew D McCulloch
- Departments of Bioengineering and Medicine, University of California, San Diego, La Jolla, CA, USA
- Institute for Engineering in Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Kyle J Gaulton
- Department of Pediatrics, Pediatric Diabetes Research Center, University of California, San Diego, La Jolla, CA, USA
- Department of Cellular and Molecular Medicine, University of California, San Diego School of Medicine, La Jolla, CA, USA
| | - Bing Ren
- Ludwig Institute for Cancer Research, La Jolla, CA, USA.
- Center for Epigenomics, University of California, San Diego, La Jolla, CA, USA
- Department of Cellular and Molecular Medicine, University of California, San Diego School of Medicine, La Jolla, CA, USA
- Institute for Genomic Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Neil C Chi
- Division of Cardiology, Department of Medicine, University of California, San Diego, La Jolla, CA, USA.
- Institute for Genomic Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Sebastian Preissl
- Center for Epigenomics, University of California, San Diego, La Jolla, CA, USA.
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Yuan X, Scott IC, Wilson MD. Heart Enhancers: Development and Disease Control at a Distance. Front Genet 2021; 12:642975. [PMID: 33777110 PMCID: PMC7987942 DOI: 10.3389/fgene.2021.642975] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 01/29/2021] [Indexed: 12/14/2022] Open
Abstract
Bound by lineage-determining transcription factors and signaling effectors, enhancers play essential roles in controlling spatiotemporal gene expression profiles during development, homeostasis and disease. Recent synergistic advances in functional genomic technologies, combined with the developmental biology toolbox, have resulted in unprecedented genome-wide annotation of heart enhancers and their target genes. Starting with early studies of vertebrate heart enhancers and ending with state-of-the-art genome-wide enhancer discovery and testing, we will review how studying heart enhancers in metazoan species has helped inform our understanding of cardiac development and disease.
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Affiliation(s)
- Xuefei Yuan
- Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON, Canada
- Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, ON, Canada
| | - Ian C. Scott
- Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michael D. Wilson
- Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
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Bollini S. One step closer to finding the Fountain of Youth in our muscles: can we grow old while staying young at heart? Cardiovasc Res 2019; 115:e85-e87. [PMID: 31038166 DOI: 10.1093/cvr/cvz099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sveva Bollini
- Department of Experimental Medicine (DIMES), University of Genova, Via A. Pastore 3, 16132 Genova, Italy
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9
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Weinberger F, Nicol P, Starbatty J, Stubbendorff M, Becher PM, Schrepfer S, Eschenhagen T. No effect of thymosin beta-4 on the expression of the transcription factor Islet-1 in the adult murine heart. Pharmacol Res Perspect 2018; 6:e00407. [PMID: 29864245 PMCID: PMC5986028 DOI: 10.1002/prp2.407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 05/03/2018] [Indexed: 01/14/2023] Open
Abstract
The transcription factor Islet-1 marks a progenitor cell population of the second heart field during cardiogenesis. In the adult heart Islet-1 expression is limited to the sinoatrial node, the ventricular outflow tract, and parasympathetic ganglia. The regenerative effect in the injured mouse ventricle of thymosin beta-4 (TB4), a 43-aminoacid peptide, was associated with increased Islet-1 immunostaining, suggesting the induction of an Islet-1-positive progenitor state by TB4. Here we aimed to reassess this effect in a genetic model. Mice from the reporter mouse line Isl1-nLacZ were primed with TB4 and subsequently underwent myocardial infarction. Islet-1 expression was assessed 2, 7, and 14 days after infarction. We detected only a single Islet-1+ cell in 8 TB4 treated and infarcted hearts which located outside of the sinoatrial node, the outflow tract or cardiac ganglia (in ~2500 sections). Two cells were identified in 5 control infarcted hearts. TB4 did not induce LacZ positivity in ventricular explants cultures of Isl1-nLacZ mice nor did it affect the density of LacZ+ cells in explant cultures of nLacZ+ regions of the heart. In summary, we found no evidence that TB4 reactivates Islet-1 expression in adult mouse ventricle.
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Affiliation(s)
- Florian Weinberger
- Department of Experimental Pharmacology and ToxicologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
| | - Philipp Nicol
- Department of Experimental Pharmacology and ToxicologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
| | - Jutta Starbatty
- Department of Experimental Pharmacology and ToxicologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
| | - Mandy Stubbendorff
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
- Department of Cardiovascular Surgery, Transplant and Stem Cell Immunobiology (TSI) LabUniversity Heart Center HamburgHamburgGermany
| | - Peter M. Becher
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
- Department of General and Interventional CardiologyUniversity Heart Center HamburgHamburgGermany
| | - Sonja Schrepfer
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
- Department of Cardiovascular Surgery, Transplant and Stem Cell Immunobiology (TSI) LabUniversity Heart Center HamburgHamburgGermany
| | - Thomas Eschenhagen
- Department of Experimental Pharmacology and ToxicologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
- DZHK, German Center for Cardiovascular Researchpartner site Hamburg/Kiel/LübeckGermany
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