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Fujiwara K, Inoue T, Kimoto A, Zixian J, Tokuhiro K, Yasukochi Y, Akama TO, Cai CL, Shiojima I, Kimura H, Yoshimura SH, Nakamura T, Hirai M. Spatial organizations of heterochromatin underpin nuclear structural integrity of ventricular cardiomyocytes against mechanical stress. Cell Rep 2024; 43:115048. [PMID: 39656588 DOI: 10.1016/j.celrep.2024.115048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Revised: 10/05/2024] [Accepted: 11/19/2024] [Indexed: 12/17/2024] Open
Abstract
Cardiomyocyte (CM) nuclei are constantly exposed to mechanical stress, but how they maintain their nuclear shape remains unknown. In this study, we found that ventricular CM nuclei acquire characteristic prominent spatial organizations of heterochromatin (SOH), which are disrupted by high-level expression of H2B-mCherry in mice. SOH disruption was associated with nuclear softening, leading to extreme elongation and rupture under unidirectional mechanical stress. Loosened chromatin then leaks into the cytosol, causing severe inflammation and cardiac dysfunction. Although SOH disruption was accompanied by loosened higher-order genomic structures, the change in gene expression before nuclear deformation was mild, suggesting that SOH play major roles in nuclear structural integrity. Aged CM nuclei consistently exhibited scattered SOH and marked elongation. Furthermore, we provide mechanistic insight into the development and maintenance of SOH driven by chromatin compaction and condensate formation. These results highlight SOH as a safeguard of nuclear shape and genomic integrity against mechanical stress.
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Affiliation(s)
- Keita Fujiwara
- Department of Pharmacology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan; Department of Medicine II, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Tadashi Inoue
- Department of Pharmacology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Aya Kimoto
- School of Life Science and Technology, Institute of Science Tokyo, Yokohama 226-8501, Japan
| | - Jiang Zixian
- Laboratory of Plasma Membrane and Nuclear Signaling, Graduate School of Biostudies, Kyoto University, Kyoto 606-8501, Japan
| | - Keizo Tokuhiro
- Department of Genome Editing, Institute of Biological Sciences, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Yoshiki Yasukochi
- Department of Genome Analysis, Institute of Biological Sciences, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Tomoya O Akama
- Department of Pharmacology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Chen-Leng Cai
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangdong 510530, China
| | - Ichiro Shiojima
- Department of Medicine II, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Hiroshi Kimura
- School of Life Science and Technology, Institute of Science Tokyo, Yokohama 226-8501, Japan; Cell Biology Center, Institute of Integrated Research, Institute of Science Tokyo, Yokohama 226-8503, Japan
| | - Shige H Yoshimura
- Laboratory of Plasma Membrane and Nuclear Signaling, Graduate School of Biostudies, Kyoto University, Kyoto 606-8501, Japan
| | - Tomoyuki Nakamura
- Department of Pharmacology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Maretoshi Hirai
- Department of Pharmacology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan.
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2
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Ross JA, Arcos-Villacis N, Battey E, Boogerd C, Orellana CA, Marhuenda E, Swiatlowska P, Hodzic D, Prin F, Mohun T, Catibog N, Tapia O, Gerace L, Iskratsch T, Shah AM, Stroud MJ. Lem2 is essential for cardiac development by maintaining nuclear integrity. Cardiovasc Res 2023; 119:2074-2088. [PMID: 37067297 PMCID: PMC10478753 DOI: 10.1093/cvr/cvad061] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 01/19/2023] [Accepted: 02/08/2023] [Indexed: 04/18/2023] Open
Abstract
AIMS Nuclear envelope integrity is essential for the compartmentalization of the nucleus and cytoplasm. Importantly, mutations in genes encoding nuclear envelope (NE) and associated proteins are the second highest cause of familial dilated cardiomyopathy. One such NE protein that causes cardiomyopathy in humans and affects mouse heart development is Lem2. However, its role in the heart remains poorly understood. METHODS AND RESULTS We generated mice in which Lem2 was specifically ablated either in embryonic cardiomyocytes (Lem2 cKO) or in adult cardiomyocytes (Lem2 iCKO) and carried out detailed physiological, tissue, and cellular analyses. High-resolution episcopic microscopy was used for three-dimensional reconstructions and detailed morphological analyses. RNA-sequencing and immunofluorescence identified altered pathways and cellular phenotypes, and cardiomyocytes were isolated to interrogate nuclear integrity in more detail. In addition, echocardiography provided a physiological assessment of Lem2 iCKO adult mice. We found that Lem2 was essential for cardiac development, and hearts from Lem2 cKO mice were morphologically and transcriptionally underdeveloped. Lem2 cKO hearts displayed high levels of DNA damage, nuclear rupture, and apoptosis. Crucially, we found that these defects were driven by muscle contraction as they were ameliorated by inhibiting myosin contraction and L-type calcium channels. Conversely, reducing Lem2 levels to ∼45% in adult cardiomyocytes did not lead to overt cardiac dysfunction up to 18 months of age. CONCLUSIONS Our data suggest that Lem2 is critical for integrity at the nascent NE in foetal hearts, and protects the nucleus from the mechanical forces of muscle contraction. In contrast, the adult heart is not detectably affected by partial Lem2 depletion, perhaps owing to a more established NE and increased adaptation to mechanical stress. Taken together, these data provide insights into mechanisms underlying cardiomyopathy in patients with mutations in Lem2 and cardio-laminopathies in general.
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Affiliation(s)
- Jacob A Ross
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
| | - Nathaly Arcos-Villacis
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
| | - Edmund Battey
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
- Centre of Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, King’s College London, London SE1 1UL, UK
| | - Cornelis Boogerd
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW), University Medical Center Utrecht, Utrecht 3584 CT, The Netherlands
| | - Constanza Avalos Orellana
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
| | - Emilie Marhuenda
- Division of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
| | - Pamela Swiatlowska
- Division of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
| | - Didier Hodzic
- Department of Developmental Biology, Washington University School of Medicine, 660S. Euclid Avenue, St Louis, MO 63110, USA
| | - Fabrice Prin
- Crick Advanced Light Microscopy Facility, The Francis Crick Institute, London NW1 1AT, UK
| | - Tim Mohun
- Crick Advanced Light Microscopy Facility, The Francis Crick Institute, London NW1 1AT, UK
| | - Norman Catibog
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
| | - Olga Tapia
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, Santander 39011, Spain
- Department of Basic Medical Sciences, Institute of Biomedical Technologies, University of La Laguna, Tenerife 38200, Spain
| | - Larry Gerace
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Thomas Iskratsch
- Division of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
| | - Ajay M Shah
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
| | - Matthew J Stroud
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular & Metabolic Medicine & Sciences, Faculty of Life Sciences & Medicine, King’s College London, James Black Centre, 125 Coldharbour Lane, London SE5 9NU, UK
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3
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Lu P, Wu B, Wang Y, Russell M, Liu Y, Bernard DJ, Zheng D, Zhou B. Prerequisite endocardial-mesenchymal transition for murine cardiac trabecular angiogenesis. Dev Cell 2023; 58:791-805.e4. [PMID: 37023750 PMCID: PMC10656710 DOI: 10.1016/j.devcel.2023.03.009] [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: 06/09/2022] [Revised: 12/01/2022] [Accepted: 03/10/2023] [Indexed: 04/08/2023]
Abstract
Coronary heart disease damages the trabecular myocardium, and the regeneration of trabecular vessels may alleviate ischemic injury. However, the origins and developmental mechanisms of trabecular vessels remain unknown. Here, we show that murine ventricular endocardial cells generate trabecular vessels through an "angioEMT" mechanism. Time course fate mapping defined a specific wave of trabecular vascularization by ventricular endocardial cells. Single-cell transcriptomics and immunofluorescence identified a subpopulation of ventricular endocardial cells that underwent endocardial-mesenchymal transition (EMT) before these cells generated trabecular vessels. Ex vivo pharmacological activation and in vivo genetic inactivation experiments identified an EMT signal in ventricular endocardial cells involving SNAI2-TGFB2/TGFBR3, which was a prerequisite for later trabecular-vessel formation. Additional loss- and gain-of-function genetic studies showed that VEGFA-NOTCH1 signaling regulated post-EMT trabecular angiogenesis by ventricular endocardial cells. Our finding that trabecular vessels originate from ventricular endocardial cells through a two-step angioEMT mechanism could inform better regeneration medicine for coronary heart disease.
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Affiliation(s)
- Pengfei Lu
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA; Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China.
| | - Bingruo Wu
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Yidong Wang
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA; Cardiovascular Research Center, School of Basic Medical Sciences, Jiaotong University, Xi'an 710061, China
| | - Megan Russell
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Yang Liu
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Daniel J Bernard
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Deyou Zheng
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA; Departments of Neurology and Neuroscience, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Bin Zhou
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA; Departments of Pediatrics and Medicine, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA.
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4
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Shekhar A, Lin X, Lin B, Liu FY, Zhang J, Khodadadi-Jamayran A, Tsirigos A, Bu L, Fishman GI, Park DS. ETV1 activates a rapid conduction transcriptional program in rodent and human cardiomyocytes. Sci Rep 2018; 8:9944. [PMID: 29967479 PMCID: PMC6028599 DOI: 10.1038/s41598-018-28239-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 06/19/2018] [Indexed: 01/07/2023] Open
Abstract
Rapid impulse propagation is a defining attribute of the pectinated atrial myocardium and His-Purkinje system (HPS) that safeguards against atrial and ventricular arrhythmias, conduction block, and myocardial dyssynchrony. The complex transcriptional circuitry that dictates rapid conduction remains incompletely understood. Here, we demonstrate that ETV1 (ER81)-dependent gene networks dictate the unique electrophysiological characteristics of atrial and His-Purkinje myocytes. Cardiomyocyte-specific deletion of ETV1 results in cardiac conduction abnormalities, decreased expression of rapid conduction genes (Nkx2-5, Gja5, and Scn5a), HPS hypoplasia, and ventricularization of the unique sodium channel properties that define Purkinje and atrial myocytes in the adult heart. Forced expression of ETV1 in postnatal ventricular myocytes (VMs) reveals that ETV1 promotes a HPS gene signature while diminishing ventricular and nodal gene networks. Remarkably, ETV1 induction in human induced pluripotent stem cell-derived cardiomyocytes increases rapid conduction gene expression and inward sodium currents, converting them towards a HPS phenotype. Our data identify a cardiomyocyte-autonomous, ETV1-dependent pathway that is responsible for specification of rapid conduction zones in the heart and demonstrate that ETV1 is sufficient to promote a HPS transcriptional and functional program upon VMs.
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Affiliation(s)
- Akshay Shekhar
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA
| | - Xianming Lin
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA
| | - Bin Lin
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA
| | - Fang-Yu Liu
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA
| | - Jie Zhang
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA
| | - Alireza Khodadadi-Jamayran
- Center for Health Informatics and Bioinformatics, New York University Langone Health, New York, New York, 10016, USA
| | - Aristotelis Tsirigos
- Center for Health Informatics and Bioinformatics, New York University Langone Health, New York, New York, 10016, USA
| | - Lei Bu
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA
| | - Glenn I Fishman
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA.
| | - David S Park
- Leon H. Charney Division of Cardiology, New York University Langone Health, New York, New York, 10016, USA.
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5
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Stroud MJ, Fang X, Veevers J, Chen J. Generation and Analysis of Striated Muscle Selective LINC Complex Protein Mutant Mice. Methods Mol Biol 2018; 1840:251-281. [PMID: 30141050 PMCID: PMC6887482 DOI: 10.1007/978-1-4939-8691-0_18] [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] [Indexed: 03/23/2023]
Abstract
The linker of nucleoskeleton and cytoskeleton (LINC) complex mediates intracellular cross talk between the nucleus and the cytoplasm. In striated muscle, the LINC complex provides structural support to the myocyte nucleus and plays an essential role in regulating gene expression and mechanotransduction. A wide range of cardiac and skeletal myopathies have been linked to mutations in LINC complex proteins. Studies utilizing tissue-specific knockout and mutant mouse models have revealed important insights into the roles of the LINC complex in striated muscle. In this chapter, we describe several feasible approaches for generating striated muscle-specific gene knockout and mutant mouse models to study LINC complex protein function in cardiac and skeletal muscle. The experimental procedures used for phenotyping and analysis of LINC complex knockout mice are also described.
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Affiliation(s)
- Matthew J Stroud
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA
- Cardiovascular Division, King's College London, British Heart Foundation Centre of Excellence, London, UK
| | - Xi Fang
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Jennifer Veevers
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Ju Chen
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA.
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6
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Yan J, Zhang L, Sultana N, Oh JG, Wu B, Hajjar RJ, Zhou B, Cai CL. A series of robust genetic indicators for definitive identification of cardiomyocytes. J Mol Cell Cardiol 2016; 97:278-85. [PMID: 27266388 DOI: 10.1016/j.yjmcc.2016.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 06/02/2016] [Indexed: 12/21/2022]
Abstract
Definitively identifying the cell type of newly generated cells in the heart and defining their origins are central questions in cardiac regenerative medicine. Currently, it is challenging to ascertain the myocardial identity and to track myocardial progeny during heart development and disease due to lack of proper genetic tools. This may lead to many misinterpretations of the findings in cardiac regenerative biology. In this study, we developed a set of novel mouse models by inserting double reporter genes nlacZ/H2B-GFP, mGFP/H2B-mCherry into the start codon of Tnnt2 and Myh6. nlacZ (nuclear lacZ) and mGFP (membrane GFP) are flanked by two LoxP sites in these animals. We found that the reporter genes faithfully recapitulated Tnnt2 and Myh6 cardiac expression from embryonic stage and adulthood. The reporter mice provide unprecedented robustness and fidelity for visualizing and tracing cardiomyocytes with nuclear or cell membrane localization signals. These animal models offer superior genetic tools to meet a critical need in studies of heart development, cardiac stem cell biology and cardiac regenerative medicine.
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Affiliation(s)
- Jianyun Yan
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Lu Zhang
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Nishat Sultana
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jae Gyun Oh
- Department of Medicine, Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Bingruo Wu
- Departments of Genetics, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, USA
| | - Roger J Hajjar
- Department of Medicine, Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Bin Zhou
- Departments of Genetics, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, USA
| | - Chen-Leng Cai
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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7
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Sultana N, Zhang L, Yan J, Chen J, Cai W, Razzaque S, Jeong D, Sheng W, Bu L, Xu M, Huang GY, Hajjar RJ, Zhou B, Moon A, Cai CL. Resident c-kit(+) cells in the heart are not cardiac stem cells. Nat Commun 2015; 6:8701. [PMID: 26515110 PMCID: PMC4846318 DOI: 10.1038/ncomms9701] [Citation(s) in RCA: 227] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 09/22/2015] [Indexed: 12/20/2022] Open
Abstract
Identifying a bona fide population of cardiac stem cells (CSCs) is a critical step for developing cell-based therapies for heart failure patients. Previously, cardiac c-kit+ cells were reported to be CSCs with a potential to become myocardial, endothelial and smooth muscle cells in vitro and after cardiac injury. Here we provide further insights into the nature of cardiac c-kit+ cells. By targeting the c-kit locus with multiple reporter genes in mice, we find that c-kit expression rarely co-localizes with the expression of the cardiac progenitor and myogenic marker Nkx2.5, or that of the myocardial marker, cardiac troponin T (cTnT). Instead, c-kit predominantly labels a cardiac endothelial cell population in developing and adult hearts. After acute cardiac injury, c-kit+ cells retain their endothelial identity and do not become myogenic progenitors or cardiomyocytes. Thus, our work strongly suggests that c-kit+ cells in the murine heart are endothelial cells and not CSCs. The issue whether the cell surface protein c-kit identifies resident cardiac stem cells (CSC) is controversial. By using novel reporter mouse models, Sultana et al. show that c-kit+ cells represent a subpopulation of endothelial cells in the developing and adult heart and do not exhibit CSC traits in health or disease.
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Affiliation(s)
- Nishat Sultana
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Lu Zhang
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Jianyun Yan
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Jiqiu Chen
- Department of Medicine, Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Weibin Cai
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Shegufta Razzaque
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Dongtak Jeong
- Department of Medicine, Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Wei Sheng
- Cardiovascular Center, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Lei Bu
- Leon H. Charney Division of Cardiology, Department of Medicine, New York University School of Medicine, New York, New York 10016, USA
| | - Mingjiang Xu
- Department of Biochemistry and Molecular Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, Florida 33136, USA
| | - Guo-Ying Huang
- Cardiovascular Center, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Roger J Hajjar
- Department of Medicine, Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Bin Zhou
- Department of Genetics, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, USA
| | - Anne Moon
- Weis Center for Research, Geisinger Clinic, Danville, Pennsylvania 17822, USA
| | - Chen-Leng Cai
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
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8
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Yan J, Zhang L, Sultana N, Park DS, Shekhar A, Bu L, Hu J, Razzaque S, Cai CL. A Murine Myh6MerCreMer Knock-In Allele Specifically Mediates Temporal Genetic Deletion in Cardiomyocytes after Tamoxifen Induction. PLoS One 2015. [PMID: 26204265 PMCID: PMC4512710 DOI: 10.1371/journal.pone.0133472] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
A mouse model that mediates temporal, specific, and efficient myocardial deletion with Cre-LoxP technology will be a valuable tool to determine the function of genes during heart formation. Mhy6 encodes a cardiac muscle specific protein: alpha-myosin heavy chain. Here, we generated a new Myh6-MerCreMer (Myh6(MerCreMer/+)) inducible Cre knock-in mouse by inserting a MerCreMer cassette into the Myh6 start codon. By crossing knock-in mice with Rosa26 reporter lines, we found the Myh6(MerCreMer/+) mice mediate complete Cre-LoxP recombination in cardiomyocytes after tamoxifen induction. X-gal staining and immunohistochemistry analysis revealed that Myh6-driven Cre recombinase was specifically activated in cardiomyocytes at embryonic and adult stages. Furthermore, echocardiography showed that Myh6(MerCreMer/+) mice maintained normal cardiac structure and function before and after tamoxifen administration. These results suggest that the new Myh6(MerCreMer/+) mouse can serve as a robust tool to dissect the roles of genes in heart development and function. Additionally, myocardial progeny during heart development and after cardiac injury can be traced using this mouse line.
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Affiliation(s)
- Jianyun Yan
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
| | - Lu Zhang
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
| | - Nishat Sultana
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
| | - David S. Park
- Leon H. Charney Division of Cardiology, New York University School of Medicine, New York, NY, United States of America
| | - Akshay Shekhar
- Leon H. Charney Division of Cardiology, New York University School of Medicine, New York, NY, United States of America
| | - Lei Bu
- Leon H. Charney Division of Cardiology, New York University School of Medicine, New York, NY, United States of America
| | - Jun Hu
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
| | - Shegufta Razzaque
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
| | - Chen-Leng Cai
- Department of Developmental and Regenerative Biology, The Black Family Stem Cell Institute, and The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
- * E-mail:
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