1
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Mia S, Sonkar R, Williams L, Latimer MN, Rawnsley DR, Rana S, He J, Dierickx P, Kim T, Xie M, Habegger KM, Kubo M, Zhou L, Thomsen MB, Prabhu SD, Frank SJ, Brookes PS, Lazar MA, Diwan A, Young ME. Novel Roles for the Transcriptional Repressor E4BP4 in Both Cardiac Physiology and Pathophysiology. JACC Basic Transl Sci 2023; 8:1141-1156. [PMID: 37791313 PMCID: PMC10543917 DOI: 10.1016/j.jacbts.2023.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 10/05/2023]
Abstract
Circadian clocks temporally orchestrate biological processes critical for cellular/organ function. For example, the cardiomyocyte circadian clock modulates cardiac metabolism, signaling, and electrophysiology over the course of the day, such that, disruption of the clock leads to age-onset cardiomyopathy (through unknown mechanisms). Here, we report that genetic disruption of the cardiomyocyte clock results in chronic induction of the transcriptional repressor E4BP4. Importantly, E4BP4 deletion prevents age-onset cardiomyopathy following clock disruption. These studies also indicate that E4BP4 regulates both cardiac metabolism (eg, fatty acid oxidation) and electrophysiology (eg, QT interval). Collectively, these studies reveal that E4BP4 is a novel regulator of both cardiac physiology and pathophysiology.
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Affiliation(s)
- Sobuj Mia
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Ravi Sonkar
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Lamario Williams
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Mary N. Latimer
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - David R. Rawnsley
- Departments of Medicine, Cell Biology and Physiology, Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Samir Rana
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jin He
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Pieterjan Dierickx
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Teayoun Kim
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Min Xie
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Kirk M. Habegger
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Masato Kubo
- Research Institute for Biomedical Science, Tokyo University of Science, Chiba, Japan
- Laboratory for Cytokine Regulation, RIKEN Center for Integrative Medical Sciences (IMS), RIKEN Yokohama Institute, Kanagawa, Japan
| | - Lufang Zhou
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Morten B. Thomsen
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Demark
| | - Sumanth D. Prabhu
- Departments of Medicine, Cell Biology and Physiology, Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Stuart J. Frank
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
- Endocrinology Section, Birmingham VAMC Medical Service, Birmingham, Alabama, USA
| | - Paul S. Brookes
- Department of Anesthesiology and Perioperative Medicine, University of Rochester, Rochester, New York, USA
| | - Mitchell A. Lazar
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Abhinav Diwan
- Departments of Medicine, Cell Biology and Physiology, Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - Martin E. Young
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
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2
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Rawnsley DR, Diwan A. Autophagy in the LVAD-Supported Heart: A Sign of Hope or a Marker of Unloading. JACC Basic Transl Sci 2023; 8:1057-1059. [PMID: 37791300 PMCID: PMC10544107 DOI: 10.1016/j.jacbts.2023.07.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Affiliation(s)
- David R. Rawnsley
- Cardiovascular Division, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- Center for Cardiovascular Research, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Abhinav Diwan
- Cardiovascular Division, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- Center for Cardiovascular Research, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Neurology, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
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3
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Guo Z, Valenzuela Ripoll C, Picataggi A, Rawnsley DR, Ozcan M, Chirinos JA, Chendamarai E, Girardi A, Riehl T, Evie H, Diab A, Kovacs A, Hyrc K, Ma X, Asnani A, Shewale SV, Scherrer-Crosbie M, Cowart LA, Parks JS, Zhao L, Gordon D, Ramirez-Valle F, Margulies KB, Cappola TP, Desai AA, Pedersen LN, Bergom C, Stitziel NO, Rettig MP, DiPersio JF, Hajny S, Christoffersen C, Diwan A, Javaheri A. Apolipoprotein M Attenuates Anthracycline Cardiotoxicity and Lysosomal Injury. JACC Basic Transl Sci 2023; 8:340-355. [PMID: 37034289 PMCID: PMC10077122 DOI: 10.1016/j.jacbts.2022.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 09/26/2022] [Accepted: 09/26/2022] [Indexed: 01/06/2023]
Abstract
Apolipoprotein M (ApoM) binds sphingosine-1-phosphate (S1P) and is inversely associated with mortality in human heart failure (HF). Here, we show that anthracyclines such as doxorubicin (Dox) reduce circulating ApoM in mice and humans, that ApoM is inversely associated with mortality in patients with anthracycline-induced heart failure, and ApoM heterozygosity in mice increases Dox-induced mortality. In the setting of Dox stress, our studies suggest ApoM can help sustain myocardial autophagic flux in a post-transcriptional manner, attenuate Dox cardiotoxicity, and prevent lysosomal injury.
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Affiliation(s)
- Zhen Guo
- Washington University School of Medicine, St Louis, Missouri, USA
| | | | | | | | - Mualla Ozcan
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Julio A. Chirinos
- Perelman School of Medicine, University of Pennsylvania School of Medicine/Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Amanda Girardi
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Terrence Riehl
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Hosannah Evie
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Ahmed Diab
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Attila Kovacs
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Krzysztof Hyrc
- Hope Center, Washington University School of Medicine, St Louis, Missouri, USA
| | - Xiucui Ma
- Washington University School of Medicine, St Louis, Missouri, USA
- John Cochran Veterans Affairs Medical Center, St Louis, Missouri, USA
| | - Aarti Asnani
- Beth Israel Deaconess, Harvard Medical School, Boston, Massachusetts, USA
| | - Swapnil V. Shewale
- Perelman School of Medicine, University of Pennsylvania School of Medicine/Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Marielle Scherrer-Crosbie
- Perelman School of Medicine, University of Pennsylvania School of Medicine/Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Lauren Ashley Cowart
- Virginia Commonwealth University, Richmond, Virginia, USA
- Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, Virginia, USA
| | - John S. Parks
- Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Lei Zhao
- Bristol Myers Squibb, Princeton, New Jersey, USA
| | - David Gordon
- Bristol Myers Squibb, Princeton, New Jersey, USA
| | | | - Kenneth B. Margulies
- Perelman School of Medicine, University of Pennsylvania School of Medicine/Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Thomas P. Cappola
- Perelman School of Medicine, University of Pennsylvania School of Medicine/Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | | | - Carmen Bergom
- Washington University School of Medicine, St Louis, Missouri, USA
| | | | | | - John F. DiPersio
- Washington University School of Medicine, St Louis, Missouri, USA
| | - Stefan Hajny
- Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Christina Christoffersen
- Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Abhinav Diwan
- Washington University School of Medicine, St Louis, Missouri, USA
- John Cochran Veterans Affairs Medical Center, St Louis, Missouri, USA
| | - Ali Javaheri
- Washington University School of Medicine, St Louis, Missouri, USA
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4
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Yan P, Kim KW, Xiao Q, Ma X, Czerniewski LR, Liu H, Rawnsley DR, Yan Y, Randolph GJ, Epelman S, Lee JM, Diwan A. Peripheral monocyte-derived cells counter amyloid plaque pathogenesis in a mouse model of Alzheimer's disease. J Clin Invest 2022; 132:152565. [PMID: 35511433 PMCID: PMC9151689 DOI: 10.1172/jci152565] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [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: 06/22/2021] [Accepted: 04/21/2022] [Indexed: 11/17/2022] Open
Abstract
Microglia, the parenchymal tissue macrophages in the brain, surround amyloid plaques in brains of individuals with Alzheimer’s disease (AD) but are ineffective at clearing amyloid to mitigate disease progression. Recent studies in mice indicate that microglia are derived exclusively from primitive yolk sac hematopoiesis and self-renew without contribution from ontogenically distinct monocytes/macrophages of definitive adult hematopoietic origin. Using a genetic fate-mapping approach to label cells of definitive hematopoietic origin throughout life span, we discovered that circulating monocytes contribute 6% of plaque-associated macrophages in aged AD mice. Moreover, peripheral monocytes contributed to a higher fraction of macrophages in the choroid plexus, meninges, and perivascular spaces of aged AD mice versus WT control mice, indicating enrichment at potential sites for entry into the brain parenchyma. Splenectomy, which markedly reduced circulating Ly6Chi monocytes, also reduced abundance of plaque-associated macrophages of definitive hematopoietic origin, resulting in increased amyloid plaque load. Together, these results indicate that peripherally derived monocytes invade the brain parenchyma, targeting amyloid plaques to reduce plaque load.
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Affiliation(s)
- Ping Yan
- Washington University School of Medicine, St. Louis, United States of America
| | - Ki-Wook Kim
- Department of Pharmacology and Regenerative Medicine, University of Illinois College of Medicine, Chicago, United States of America
| | - Qingli Xiao
- Department of Neurology, Washington University School of Medicine, St. Louis, United States of America
| | - Xiucui Ma
- Department of Medicine, Washington University School of Medicine, St. Louis, United States of America
| | - Leah R Czerniewski
- Department of Neurology, Washington University School of Medicine, St. Louis, United States of America
| | - Haiyan Liu
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, United States of America
| | - David R Rawnsley
- Department of Medicine, Washington University School of Medicine, St. Louis, United States of America
| | - Yan Yan
- Department of Surgery, Washington University School of Medicine, St. Louis, United States of America
| | - Gwendalyn J Randolph
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, United States of America
| | - Slava Epelman
- Cardiology, University Health Network, Toronto, Canada
| | - Jin-Moo Lee
- Washington University School of Medicine, St. Louis, United States of America
| | - Abhinav Diwan
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, United States of America
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5
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Ma X, Rawnsley DR, Kovacs A, Islam M, Murphy JT, Zhao C, Kumari M, Foroughi L, Liu H, Qi K, Diwan A, Hyrc K, Evans S, Satoh T, French BA, Margulies KB, Javaheri A, Razani B, Mann DL, Mani K, Diwan A. TRAF2, an Innate Immune Sensor, Reciprocally Regulates Mitophagy and Inflammation to Maintain Cardiac Myocyte Homeostasis. JACC Basic Transl Sci 2022; 7:223-243. [PMID: 35411325 PMCID: PMC8993766 DOI: 10.1016/j.jacbts.2021.12.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 12/26/2022]
Abstract
Mitochondria are essential for cardiac myocyte function, but damaged mitochondria trigger cardiac myocyte death. Although mitophagy, a lysosomal degradative pathway to remove damaged mitochondria, is robustly active in cardiac myocytes in the unstressed heart, its mechanisms and physiological role remain poorly defined. We discovered a critical role for TRAF2, an innate immunity effector protein with E3 ubiquitin ligase activity, in facilitating physiological cardiac myocyte mitophagy in the adult heart, to prevent inflammation and cell death, and maintain myocardial homeostasis.
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Key Words
- AAV9, adeno-associated virus serotype 9
- ER, endoplasmic reticulum
- FS, fractional shortening
- GFP, green fluorescent protein
- IP, intraperitoneal
- LV, left ventricular
- MAM, mitochondria-associated membranes
- MCM, MerCreMer
- MEF, murine embryonic fibroblast
- PINK1, PTEN-induced kinase 1
- RFP, red fluorescent protein
- TLR9, toll-like receptor 9
- TRAF2
- TRAF2, tumor necrosis factor receptor-associated factor-2
- TUNEL, terminal deoxynucleotidyl transferase dUTP nick end labeling
- cTnT, cardiac troponin T
- cell death
- inflammation
- mitophagy
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Affiliation(s)
- Xiucui Ma
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - David R. Rawnsley
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Attila Kovacs
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Moydul Islam
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - John T. Murphy
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - Chen Zhao
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Minu Kumari
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Layla Foroughi
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - Haiyan Liu
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - Kevin Qi
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Aaradhya Diwan
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Krzysztof Hyrc
- Alafi Neuroimaging Laboratory, Washington University School of Medicine, St. Louis, Missouri, USA
- Hope Center for Neurological Disorders, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Sarah Evans
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Takashi Satoh
- Department of Immune Regulation, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Brent A. French
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia, USA
| | - Kenneth B. Margulies
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ali Javaheri
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Babak Razani
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - Douglas L. Mann
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Kartik Mani
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
| | - Abhinav Diwan
- Center for Cardiovascular Research and Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- John Cochran VA Medical Center, St. Louis, Missouri, USA
- Hope Center for Neurological Disorders, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
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6
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Rawnsley DR, Diwan A. Lysosome impairment as a trigger for inflammation in obesity: The proof is in the fat. EBioMedicine 2020; 56:102824. [PMID: 32540774 PMCID: PMC7300142 DOI: 10.1016/j.ebiom.2020.102824] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 05/19/2020] [Indexed: 11/24/2022] Open
Abstract
Obesity is a global epidemic contributing to the rising prevalence of multiple disorders including metabolic syndrome, diabetes, fatty liver disease, cardiovascular and cerebrovascular disease, Alzheimer's disease and certain cancers. A renewed sense of urgency is required as obesity remains an intractable problem, despite a rapidly expanding armamentarium of behavioral, pharmacologic and surgical approaches which fall short of delivering sustained results
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Affiliation(s)
- David R Rawnsley
- Cardiolovascular Division, Washington University School of Medicine, Division of Cardiology, 660 S. Euclid, CSRB 827 NTA, St. Louis, MO 63110, United States; Center for Cardiovascular Research, Washington University School of Medicine, St. Louis, MO, United States
| | - Abhinav Diwan
- Cardiolovascular Division, Washington University School of Medicine, Division of Cardiology, 660 S. Euclid, CSRB 827 NTA, St. Louis, MO 63110, United States; Center for Cardiovascular Research, Washington University School of Medicine, St. Louis, MO, United States; John Cochran Veterans Affairs Medical Center, St. Louis, MO, United States.
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7
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Serpooshan V, Liu YH, Buikema JW, Galdos FX, Chirikian O, Paige S, Venkatraman S, Kumar A, Rawnsley DR, Huang X, Pijnappels DA, Wu SM. Nkx2.5+ Cardiomyoblasts Contribute to Cardiomyogenesis in the Neonatal Heart. Sci Rep 2017; 7:12590. [PMID: 28974782 PMCID: PMC5626718 DOI: 10.1038/s41598-017-12869-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 09/15/2017] [Indexed: 01/26/2023] Open
Abstract
During normal lifespan, the mammalian heart undergoes limited renewal of cardiomyocytes. While the exact mechanism for this renewal remains unclear, two possibilities have been proposed: differentiated myocyte replication and progenitor/immature cell differentiation. This study aimed to characterize a population of cardiomyocyte precursors in the neonatal heart and to determine their requirement for cardiac development. By tracking the expression of an embryonic Nkx2.5 cardiac enhancer, we identified cardiomyoblasts capable of differentiation into striated cardiomyocytes in vitro. Genome-wide expression profile of neonatal Nkx2.5+ cardiomyoblasts showed the absence of sarcomeric gene and the presence of cardiac transcription factors. To determine the lineage contribution of the Nkx2.5+ cardiomyoblasts, we generated a doxycycline suppressible Cre transgenic mouse under the regulation of the Nkx2.5 enhancer and showed that neonatal Nkx2.5+ cardiomyoblasts mature into cardiomyocytes in vivo. Ablation of neonatal cardiomyoblasts resulted in ventricular hypertrophy and dilation, supporting a functional requirement of the Nkx2.5+ cardiomyoblasts. This study provides direct lineage tracing evidence that a cardiomyoblast population contributes to cardiogenesis in the neonatal heart. The cell population identified here may serve as a promising therapeutic for pediatric cardiac regeneration.
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Affiliation(s)
- Vahid Serpooshan
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Yuan-Hung Liu
- Cardiovascular Research Center and Department of Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA, 02114, USA.,Division of Cardiology, Department of Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA, 02114, USA.,Section of Cardiology, Cardiovascular Center, Far Eastern Memorial Hospital, New Taipei City, Taiwan
| | - Jan W Buikema
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA.,Department of Cardiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Francisco X Galdos
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Orlando Chirikian
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA.,Biology Program, California State University Channel Islands, Camarillo, CA, USA
| | - Sharon Paige
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA.,Department of Pediatrics, Division of Pediatric Cardiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Sneha Venkatraman
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA.,Biology Program, California State University Channel Islands, Camarillo, CA, USA
| | - Anusha Kumar
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - David R Rawnsley
- Cardiovascular Research Center and Department of Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA, 02114, USA
| | - Xiaojing Huang
- Cardiovascular Research Center and Department of Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA, 02114, USA
| | - Daniël A Pijnappels
- Cardiovascular Research Center and Department of Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA, 02114, USA.,Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Sean M Wu
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA. .,Department of Medicine, Division of Cardiovascular Medicine, and Stanford University School of Medicine, Stanford, CA, USA. .,Institute of Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA.
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8
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Jakus Z, Gleghorn JP, Enis DR, Sen A, Chia S, Liu X, Rawnsley DR, Yang Y, Hess PR, Zou Z, Yang J, Guttentag SH, Nelson CM, Kahn ML. Lymphatic function is required prenatally for lung inflation at birth. ACTA ACUST UNITED AC 2014; 211:815-26. [PMID: 24733830 PMCID: PMC4010903 DOI: 10.1084/jem.20132308] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Neonatal mice lacking lymphatic vessels due to loss of lymphangiogenic factor CCBE1 or VEGFR3 function fail to inflate their lungs, suggestive of respiratory failure in infants with congenital pulmonary lymphangiectasia. Mammals must inflate their lungs and breathe within minutes of birth to survive. A key regulator of neonatal lung inflation is pulmonary surfactant, a lipoprotein complex which increases lung compliance by reducing alveolar surface tension (Morgan, 1971). Whether other developmental processes also alter lung mechanics in preparation for birth is unknown. We identify prenatal lymphatic function as an unexpected requirement for neonatal lung inflation and respiration. Mice lacking lymphatic vessels, due either to loss of the lymphangiogenic factor CCBE1 or VEGFR3 function, appear cyanotic and die shortly after birth due to failure of lung inflation. Failure of lung inflation is not due to reduced surfactant levels or altered development of the lung but is associated with an elevated wet/dry ratio consistent with edema. Embryonic studies reveal active lymphatic function in the late gestation lung, and significantly reduced total lung compliance in late gestation embryos that lack lymphatics. These findings reveal that lymphatic vascular function plays a previously unrecognized mechanical role in the developing lung that prepares it for inflation at birth. They explain respiratory failure in infants with congenital pulmonary lymphangiectasia, and suggest that inadequate late gestation lymphatic function may also contribute to respiratory failure in premature infants.
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Affiliation(s)
- Zoltán Jakus
- Department of Medicine, 2 Cardiovascular Institute, and 3 Department of Dermatology, University of Pennsylvania, Philadelphia, PA 19104
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9
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Hess PR, Rawnsley DR, Jakus Z, Yang Y, Sweet DT, Fu J, Herzog B, Lu M, Nieswandt B, Oliver G, Makinen T, Xia L, Kahn ML. Platelets mediate lymphovenous hemostasis to maintain blood-lymphatic separation throughout life. J Clin Invest 2014; 124:273-84. [PMID: 24292710 DOI: 10.1172/jci70422] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Accepted: 09/26/2013] [Indexed: 11/17/2022] Open
Abstract
Mammals transport blood through a high-pressure, closed vascular network and lymph through a low-pressure, open vascular network. These vascular networks connect at the lymphovenous (LV) junction, where lymph drains into blood and an LV valve (LVV) prevents backflow of blood into lymphatic vessels. Here we describe an essential role for platelets in preventing blood from entering the lymphatic system at the LV junction. Loss of CLEC2, a receptor that activates platelets in response to lymphatic endothelial cells, resulted in backfilling of the lymphatic network with blood from the thoracic duct (TD) in both neonatal and mature mice. Fibrin-containing platelet thrombi were observed at the LVV and in the terminal TD in wild-type mice, but not Clec2-deficient mice. Analysis of mice lacking LVVs or lymphatic valves revealed that platelet-mediated thrombus formation limits LV backflow under conditions of impaired valve function. Examination of mice lacking integrin-mediated platelet aggregation indicated that platelet aggregation stabilizes thrombi that form in the lymphatic vascular environment to prevent retrograde blood flow. Collectively, these studies unveil a newly recognized form of hemostasis that functions with the LVV to safeguard the lymphatic vascular network throughout life.
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Rawnsley DR, Xiao J, Lee JS, Liu X, Mericko-Ishizuka P, Kumar V, He J, Basu A, Lu M, Lynn FC, Pack M, Gasa R, Kahn ML. The transcription factor Atonal homolog 8 regulates Gata4 and Friend of Gata-2 during vertebrate development. J Biol Chem 2013; 288:24429-40. [PMID: 23836893 DOI: 10.1074/jbc.m113.463083] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
GATA and Friend of GATA (FOG) form a transcriptional complex that plays a key role in cardiovascular development in both fish and mammals. In the present study we demonstrate that the basic helix-loop-helix transcription factor Atonal homolog 8 (Atoh8) is required for development of the heart in fish but not in mice. Genetic studies reveal that Atoh8 interacts specifically with Gata4 and Fog1 during development of the heart and swim bladder in the fish. Biochemical studies reveal that ATOH8, GATA4, and FOG2 associate in a single complex in vitro. In contrast to fish, ATOH8-deficient mice exhibit normal cardiac development and loss of ATOH8 does not alter cardiac development in Gata4(+/-) mice. This species difference in the role of ATOH8 is explained in part by LacZ and GFP reporter alleles that reveal restriction of Atoh8 expression to atrial but not ventricular myocardium in the mouse. Our findings identify ATOH8 as a novel regulator of GATA-FOG function that is required for cardiac development in the fish but not the mouse. Whether ATOH8 modulates GATA-FOG function at other sites or in more subtle ways in mammals is not yet known.
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Affiliation(s)
- David R Rawnsley
- Department of Medicine and Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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