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Roberts JD, Murphy NP, Hamilton RM, Lubbers ER, James CA, Kline CF, Gollob MH, Krahn AD, Sturm AC, Musa H, El-Refaey M, Koenig S, Aneq MÅ, Hoorntje ET, Graw SL, Davies RW, Rafiq MA, Koopmann TT, Aafaqi S, Fatah M, Chiasson DA, Taylor MR, Simmons SL, Han M, van Opbergen CJ, Wold LE, Sinagra G, Mittal K, Tichnell C, Murray B, Codima A, Nazer B, Nguyen DT, Marcus FI, Sobriera N, Lodder EM, van den Berg MP, Spears DA, Robinson JF, Ursell PC, Green AK, Skanes AC, Tang AS, Gardner MJ, Hegele RA, van Veen TA, Wilde AA, Healey JS, Janssen PM, Mestroni L, van Tintelen JP, Calkins H, Judge DP, Hund TJ, Scheinman MM, Mohler PJ. Ankyrin-B dysfunction predisposes to arrhythmogenic cardiomyopathy and is amenable to therapy. J Clin Invest 2019; 129:3171-3184. [PMID: 31264976 PMCID: PMC6668697 DOI: 10.1172/jci125538] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 05/14/2019] [Indexed: 01/11/2023] Open
Abstract
Arrhythmogenic cardiomyopathy (ACM) is an inherited arrhythmia syndrome characterized by severe structural and electrical cardiac phenotypes, including myocardial fibrofatty replacement and sudden cardiac death. Clinical management of ACM is largely palliative, owing to an absence of therapies that target its underlying pathophysiology, which stems partially from our limited insight into the condition. Following identification of deceased ACM probands possessing ANK2 rare variants and evidence of ankyrin-B loss of function on cardiac tissue analysis, an ANK2 mouse model was found to develop dramatic structural abnormalities reflective of human ACM, including biventricular dilation, reduced ejection fraction, cardiac fibrosis, and premature death. Desmosomal structure and function appeared preserved in diseased human and murine specimens in the presence of markedly abnormal β-catenin expression and patterning, leading to identification of a previously unknown interaction between ankyrin-B and β-catenin. A pharmacological activator of the WNT/β-catenin pathway, SB-216763, successfully prevented and partially reversed the murine ACM phenotypes. Our findings introduce what we believe to be a new pathway for ACM, a role of ankyrin-B in cardiac structure and signaling, a molecular link between ankyrin-B and β-catenin, and evidence for targeted activation of the WNT/β-catenin pathway as a potential treatment for this disease.
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Affiliation(s)
- Jason D. Roberts
- Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, Ontario, Canada
- Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, UCSF, San Francisco, California, USA
| | - Nathaniel P. Murphy
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Robert M. Hamilton
- The Labatt Family Heart Centre (Department of Pediatrics) and Translational Medicine, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | - Ellen R. Lubbers
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Cynthia A. James
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Crystal F. Kline
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Michael H. Gollob
- Peter Munk Cardiac Centre, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Andrew D. Krahn
- Heart Rhythm Services, Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Amy C. Sturm
- Genomic Medicine Institute, Geisinger, Danville, Pennsylvania, USA
| | - Hassan Musa
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Mona El-Refaey
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Sara Koenig
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Meriam Åström Aneq
- Department of Clinical Physiology and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | - Edgar T. Hoorntje
- Netherlands Heart Institute, Utrecht, Netherlands
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Sharon L. Graw
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado, USA
| | - Robert W. Davies
- Program in Genetics and Genome Biology and The Centre for Applied Genomics, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Muhammad Arshad Rafiq
- The Labatt Family Heart Centre (Department of Pediatrics) and Translational Medicine, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
- Department of Bioscience, COMSATS University, Islamabad, Pakistan
| | - Tamara T. Koopmann
- The Labatt Family Heart Centre (Department of Pediatrics) and Translational Medicine, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | - Shabana Aafaqi
- The Labatt Family Heart Centre (Department of Pediatrics) and Translational Medicine, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | - Meena Fatah
- The Labatt Family Heart Centre (Department of Pediatrics) and Translational Medicine, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | - David A. Chiasson
- Pediatric Laboratory Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Matthew R.G. Taylor
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado, USA
| | - Samantha L. Simmons
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Mei Han
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Chantal J.M. van Opbergen
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center, Utrecht, Utrecht University, Utrecht, Netherlands
| | - Loren E. Wold
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | | | - Kirti Mittal
- The Labatt Family Heart Centre (Department of Pediatrics) and Translational Medicine, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | - Crystal Tichnell
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Brittney Murray
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Alberto Codima
- Department of Medicine, University of Sao Paulo, Sao Paulo, Brazil
| | - Babak Nazer
- Knight Cardiovascular Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Duy T. Nguyen
- Section of Cardiac Electrophysiology, Division of Cardiology, University of Colorado, Aurora, Colorado, USA
| | - Frank I. Marcus
- Division of Cardiology, Sarver Heart Center, University of Arizona, Tucson, Arizona, USA
| | - Nara Sobriera
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Elisabeth M. Lodder
- Amsterdam University Medical Center, University of Amsterdam, Heart Centre, Department of Clinical and Experimental Cardiology, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Maarten P. van den Berg
- Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Danna A. Spears
- Peter Munk Cardiac Centre, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada
| | - John F. Robinson
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | | | - Anna K. Green
- Departments of Clinical Genetics and Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Allan C. Skanes
- Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, Ontario, Canada
| | - Anthony S. Tang
- Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, Ontario, Canada
| | - Martin J. Gardner
- Division of Cardiology, Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Robert A. Hegele
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
- Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Toon A.B. van Veen
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center, Utrecht, Utrecht University, Utrecht, Netherlands
| | - Arthur A.M. Wilde
- Amsterdam University Medical Center, University of Amsterdam, Heart Centre, Department of Clinical and Experimental Cardiology, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Jeff S. Healey
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Paul M.L. Janssen
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Luisa Mestroni
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado, USA
| | - J. Peter van Tintelen
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
- Amsterdam UMC, University of Amsterdam, Department of Clinical Genetics, Amsterdam, Netherlands
- Department of Genetics, University Medical Center Utrecht (UMCU), Utrecht, Netherlands
| | - Hugh Calkins
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Daniel P. Judge
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
- Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Thomas J. Hund
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Melvin M. Scheinman
- Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, UCSF, San Francisco, California, USA
| | - Peter J. Mohler
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Departments of Physiology and Cell Biology and Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
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Swayne LA, Murphy NP, Asuri S, Chen L, Xu X, McIntosh S, Wang C, Lancione PJ, Roberts JD, Kerr C, Sanatani S, Sherwin E, Kline CF, Zhang M, Mohler PJ, Arbour LT. Novel Variant in the ANK2 Membrane-Binding Domain Is Associated With Ankyrin-B Syndrome and Structural Heart Disease in a First Nations Population With a High Rate of Long QT Syndrome. ACTA ACUST UNITED AC 2017; 10:CIRCGENETICS.116.001537. [PMID: 28196901 DOI: 10.1161/circgenetics.116.001537] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 11/21/2016] [Indexed: 01/15/2023]
Abstract
BACKGROUND Long QT syndrome confers susceptibility to ventricular arrhythmia, predisposing to syncope, seizures, and sudden death. While rare globally, long QT syndrome is ≈15× more common in First Nations of Northern British Columbia largely because of a known mutation in KCNQ1. However, 2 large multigenerational families were affected, but negative for the known mutation. METHODS AND RESULTS Long QT syndrome panel testing was carried out in the index case of each family, and clinical information was collected. Cascade genotyping was performed. Biochemical and myocyte-based assays were performed to evaluate the identified gene variant for loss-of-function activity. Index cases in these 2 families harbored a novel ANK2 c.1937C>T variant (p.S646F). An additional 16 carriers were identified, including 2 with structural heart disease: one with cardiomyopathy resulting in sudden death and the other with congenital heart disease. For all carriers of this variant, the average QTc was 475 ms (±40). Although ankyrin-B p.S646F is appropriately folded and expressed in bacteria, the mutant polypeptide displays reduced expression in cultured H9c2 cells and aberrant localization in primary cardiomyocytes. Furthermore, myocytes expressing ankyrin-B p.S646F lack normal membrane targeting of the ankyrin-binding partner, the Na/Ca exchanger. Thus, ankyrin-B p.S646F is a loss-of-function variant. CONCLUSIONS We identify the first disease-causing ANK2 variant localized to the membrane-binding domain resulting in reduced ankyrin-B expression and abnormal localization. Further study is warranted on the potential association of this variant with structural heart disease given the role of ANK2 in targeting and stabilization of key structural and signaling molecules in cardiac cells.
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Affiliation(s)
- Leigh Anne Swayne
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Nathaniel P Murphy
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Sirisha Asuri
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Lena Chen
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Xiaoxue Xu
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Sarah McIntosh
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Chao Wang
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Peter J Lancione
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Jason D Roberts
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Charles Kerr
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Shubhayan Sanatani
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Elizabeth Sherwin
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Crystal F Kline
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Mingjie Zhang
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Peter J Mohler
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.)
| | - Laura T Arbour
- From the Division of Medical Sciences, University of Victoria, BC, Canada (L.A.S., L.C., X.X., L.T.A.); University of British Columbia Island Medical Program, Victoria, BC, Canada (L.A.S., L.T.A.); Department of Medical Genetics (S.A., S.M., L.T.A.), Division of Cardiology (C.K.), and Division of Cardiology, Department of Pediatrics, BC Children's Hospital (S.S., E.S.), University of British Columbia, Vancouver, BC, Canada; Division of Cardiovascular Medicine, Department of Internal Medicine, Dorothy M. Davis Heart and Lung Research Institute (N.P.M., P.J.L., C.F.K., P.J.M.) and Department of Physiology and Cell Biology (N.P.M., P.J.L., C.F.K., P.J.M.), The Ohio State University Wexner Medical Center, Columbus, OH; Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China (C.W., M.Z.); and Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (J.D.R.).
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Huq AJ, Pertile MD, Davis AM, Landon H, James PA, Kline CF, Vohra J, Mohler PJ, Delatycki MB. A Novel Mechanism for Human Cardiac Ankyrin-B Syndrome due to Reciprocal Chromosomal Translocation. Heart Lung Circ 2016; 26:612-618. [PMID: 27916589 DOI: 10.1016/j.hlc.2016.09.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 09/23/2016] [Accepted: 09/27/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND Cardiac rhythm abnormalities are a leading cause of morbidity and mortality in developed countries. Loss-of-function variants in the ANK2 gene can cause a variety of cardiac rhythm abnormalities including sinus node dysfunction, atrial fibrillation and ventricular arrhythmias (called the "ankyrin-B syndrome"). ANK2 encodes ankyrin-B, a molecule critical for the membrane targeting of key cardiac ion channels, transporters, and signalling proteins. METHODS AND RESULTS Here, we describe a family with a reciprocal chromosomal translocation between chromosomes 4q25 and 9q26 that transects the ANK2 gene on chromosome 4 resulting in loss-of-function of ankyrin-B. Select family members with ankyrin-B haploinsufficiency due to the translocation displayed clinical features of ankyrin-B syndrome. Furthermore, evaluation of primary lymphoblasts from a carrier of the translocation showed altered levels of ankyrin-B as well as a reduced expression of downstream ankyrin-binding partners. CONCLUSIONS Thus, our data conclude that, similar to previously described ANK2 loss-of-function "point mutations", large chromosomal translocations resulting in ANK2 haploinsufficiency are sufficient to cause the human cardiac ankyrin-B syndrome. The unexpected ascertainment of ANK2 dysfunction via the discovery of a chromosomal translocation in this family, the determination of the familial phenotype, as well as the complexities in formulating screening and treatment strategies are discussed.
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Affiliation(s)
- A J Huq
- Department of Clinical Genetics, Austin Hospital, Melbourne, Vic, Australia; Department of Genetic Medicine, Royal Melbourne Hospital, Melbourne, Vic, Australia.
| | - M D Pertile
- Victorian Clinical Genetics Services, Melbourne, Vic, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Vic, Australia
| | - A M Davis
- Department of Cardiology, Royal Children's Hospital, Melbourne, Vic, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Vic, Australia; Murdoch Childrens Research Institute, Melbourne, Vic, Australia
| | - H Landon
- Dorothy M. Davis Heart and Lung Research Institute; Departments of Physiology & Cell Biology and Internal Medicine; Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - P A James
- Department of Genetic Medicine, Royal Melbourne Hospital, Melbourne, Vic, Australia; Department of Pathology, University of Melbourne, Melbourne, Vic, Australia
| | - C F Kline
- Dorothy M. Davis Heart and Lung Research Institute; Departments of Physiology & Cell Biology and Internal Medicine; Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - J Vohra
- Department of Genetic Medicine, Royal Melbourne Hospital, Melbourne, Vic, Australia; Department of Cardiology, Royal Melbourne Hospital, Melbourne, Vic, Australia
| | - P J Mohler
- Dorothy M. Davis Heart and Lung Research Institute; Departments of Physiology & Cell Biology and Internal Medicine; Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - M B Delatycki
- Department of Clinical Genetics, Austin Hospital, Melbourne, Vic, Australia; Victorian Clinical Genetics Services, Melbourne, Vic, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Vic, Australia; Bruce Lefroy Centre, Murdoch Childrens Research Institute, Melbourne, Vic, Australia
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4
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Musa H, Murphy NP, Curran J, Higgins JD, Webb TR, Makara MA, Wright P, Lancione PJ, Lubbers ER, Healy JA, Smith SA, Bennett V, Hund TJ, Kline CF, Mohler PJ. Common human ANK2 variant confers in vivo arrhythmia phenotypes. Heart Rhythm 2016; 13:1932-40. [PMID: 27298202 DOI: 10.1016/j.hrthm.2016.06.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND Human ANK2 (ankyrin-B) loss-of-function variants are directly linked with arrhythmia phenotypes. However, in atypical non-ion channel arrhythmia genes such as ANK2 that lack the same degree of robust structure/function and clinical data, it may be more difficult to assign variant disease risk based simply on variant location, minor allele frequency, and/or predictive structural algorithms. The human ankyrin-B p.L1622I variant found in arrhythmia probands displays significant diversity in minor allele frequency across populations. OBJECTIVE The objective of this study was to directly test the in vivo impact of ankyrin-B p.L1622I on cardiac electrical phenotypes and arrhythmia risk using a new animal model. METHODS We tested arrhythmia phenotypes in a new "knock-in" animal model harboring the human ankyrin-B p.L1622I variant. RESULTS Ankyrin-B p.L1622I displays reduced posttranslational expression in vivo, resulting in reduced cardiac ankyrin-B expression and reduced association with binding-partner Na/Ca exchanger. Ankyrin-B(L1622I/L1622I) mice display changes in heart rate, atrioventricular and intraventricular conduction, and alterations in repolarization. Furthermore, ankyrin-B(L1622I/L1622I) mice display catecholamine-dependent arrhythmias. At the cellular level, ankyrin-B(L1622I/L1622I) myocytes display increased action potential duration and severe arrhythmogenic afterdepolarizations that provide a mechanistic rationale for the arrhythmias. CONCLUSION Our findings support in vivo arrhythmogenic phenotypes of an ANK2 variant with unusual frequency in select populations. On the basis of our findings and current clinical data, we support classification of p.L1622I as a "mild" loss-of-function variant that may confer arrhythmia susceptibility in the context of secondary risk factors including environment, medication, and/or additional genetic variation.
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Affiliation(s)
- Hassan Musa
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Nathaniel P Murphy
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Jerry Curran
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - John D Higgins
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Tyler R Webb
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Michael A Makara
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Patrick Wright
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Peter J Lancione
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Ellen R Lubbers
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Jane A Healy
- Department of Biochemistry and Howard Hughes Medical Institute, Duke University Medical Center, Durham, NC
| | - Sakima A Smith
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Internal Medicine, Division of Cardiovascular Medicine
| | - Vann Bennett
- Department of Biochemistry and Howard Hughes Medical Institute, Duke University Medical Center, Durham, NC
| | - Thomas J Hund
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Internal Medicine, Division of Cardiovascular Medicine,; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, OH
| | - Crystal F Kline
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH
| | - Peter J Mohler
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Physiology & Cell Biology College of Medicine, The Ohio State University, Columbus, OH; Department of Internal Medicine, Division of Cardiovascular Medicine,.
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5
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Smith SA, Hughes LD, Kline CF, Kempton AN, Dorn LE, Curran J, Makara M, Webb TR, Wright P, Voigt N, Binkley PF, Janssen PML, Kilic A, Carnes CA, Dobrev D, Rasband MN, Hund TJ, Mohler PJ. Dysfunction of the β2-spectrin-based pathway in human heart failure. Am J Physiol Heart Circ Physiol 2016; 310:H1583-91. [PMID: 27106045 DOI: 10.1152/ajpheart.00875.2015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 04/11/2016] [Indexed: 11/22/2022]
Abstract
β2-Spectrin is critical for integrating membrane and cytoskeletal domains in excitable and nonexcitable cells. The role of β2-spectrin for vertebrate function is illustrated by dysfunction of β2-spectrin-based pathways in disease. Recently, defects in β2-spectrin association with protein partner ankyrin-B were identified in congenital forms of human arrhythmia. However, the role of β2-spectrin in common forms of acquired heart failure and arrhythmia is unknown. We report that β2-spectrin protein levels are significantly altered in human cardiovascular disease as well as in large and small animal cardiovascular disease models. Specifically, β2-spectrin levels were decreased in atrial samples of patients with atrial fibrillation compared with tissue from patients in sinus rhythm. Furthermore, compared with left ventricular samples from nonfailing hearts, β2-spectrin levels were significantly decreased in left ventricle of ischemic- and nonischemic heart failure patients. Left ventricle samples of canine and murine heart failure models confirm reduced β2-spectrin protein levels. Mechanistically, we identify that β2-spectrin levels are tightly regulated by posttranslational mechanisms, namely Ca(2+)- and calpain-dependent proteases. Furthermore, consistent with this data, we observed Ca(2+)- and calpain-dependent loss of β2-spectrin downstream effector proteins, including ankyrin-B in heart. In summary, our findings illustrate that β2-spectrin and downstream molecules are regulated in multiple forms of cardiovascular disease via Ca(2+)- and calpain-dependent proteolysis.
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Affiliation(s)
- Sakima A Smith
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio;
| | - Langston D Hughes
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio
| | - Crystal F Kline
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Amber N Kempton
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Lisa E Dorn
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Jerry Curran
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Michael Makara
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Tyler R Webb
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Patrick Wright
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Niels Voigt
- Faculty of Medicine, Institute of Pharmacology, University Duisburg-Essen, Essen, Germany; and
| | - Philip F Binkley
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio
| | - Paul M L Janssen
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
| | - Ahmet Kilic
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Cynthia A Carnes
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; College of Pharmacy, The Ohio State University, Columbus, Ohio
| | - Dobromir Dobrev
- Faculty of Medicine, Institute of Pharmacology, University Duisburg-Essen, Essen, Germany; and
| | - Matthew N Rasband
- Department of Neuroscience, Baylor College of Medicine, Houston, Texas
| | - Thomas J Hund
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio
| | - Peter J Mohler
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio; Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio; Department of Physiology and Cell Biology, Columbus, Ohio
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Beyder A, Gibbons SJ, Mazzone A, Strege PR, Saravanaperumal SA, Sha L, Higgins S, Eisenman ST, Bernard CE, Geurts A, Kline CF, Mohler PJ, Farrugia G. Expression and function of the Scn5a-encoded voltage-gated sodium channel NaV 1.5 in the rat jejunum. Neurogastroenterol Motil 2016; 28:64-73. [PMID: 26459913 PMCID: PMC4688076 DOI: 10.1111/nmo.12697] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/05/2015] [Indexed: 12/20/2022]
Abstract
BACKGROUND The SCN5A-encoded voltage-gated sodium channel NaV 1.5 is expressed in human jejunum and colon. Mutations in NaV 1.5 are associated with gastrointestinal motility disorders. The rat gastrointestinal tract expresses voltage-gated sodium channels, but their molecular identity and role in rat gastrointestinal electrophysiology are unknown. METHODS The presence and distribution of Scn5a-encoded NaV 1.5 was examined by PCR, Western blotting and immunohistochemistry in rat jejunum. Freshly dissociated smooth muscle cells were examined by whole cell electrophysiology. Zinc finger nuclease was used to target Scn5a in rats. Lentiviral-mediated transduction with shRNA was used to target Scn5a in rat jejunum smooth muscle organotypic cultures. Organotypic cultures were examined by sharp electrode electrophysiology and RT-PCR. KEY RESULTS We found NaV 1.5 in rat jejunum and colon smooth muscle by Western blot. Immunohistochemistry using two other antibodies of different portions of NaV 1.5 revealed the presence of the ion channel in rat jejunum. Whole cell voltage-clamp in dissociated smooth muscle cells from rat jejunum showed fast activating and inactivating voltage-dependent inward current that was eliminated by Na(+) replacement by NMDG(+) . Constitutive rat Scn5a knockout resulted in death in utero. NaV 1.5 shRNA delivered by lentivirus into rat jejunum smooth muscle organotypic culture resulted in 57% loss of Scn5a mRNA and several significant changes in slow waves, namely 40% decrease in peak amplitude, 30% decrease in half-width, and 7 mV hyperpolarization of the membrane potential at peak amplitude. CONCLUSIONS & INFERENCES Scn5a-encoded NaV 1.5 is expressed in rat gastrointestinal smooth muscle and it contributes to smooth muscle electrophysiology.
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Affiliation(s)
- A Beyder
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - S J Gibbons
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - A Mazzone
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - P R Strege
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - S A Saravanaperumal
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - L Sha
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - S Higgins
- College of Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - S T Eisenman
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - C E Bernard
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - A Geurts
- Human and Molecular Genetics Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - C F Kline
- The Dorothy M. Davis Heart and Lung Research Institute and Departments of Physiology & Cell Biology and Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - P J Mohler
- The Dorothy M. Davis Heart and Lung Research Institute and Departments of Physiology & Cell Biology and Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - G Farrugia
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
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7
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Neshatian L, Strege PR, Rhee PL, Kraichely RE, Mazzone A, Bernard CE, Cima RR, Larson DW, Dozois EJ, Kline CF, Mohler PJ, Beyder A, Farrugia G. Ranolazine inhibits voltage-gated mechanosensitive sodium channels in human colon circular smooth muscle cells. Am J Physiol Gastrointest Liver Physiol 2015; 309:G506-12. [PMID: 26185330 PMCID: PMC4572410 DOI: 10.1152/ajpgi.00051.2015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 07/09/2015] [Indexed: 01/31/2023]
Abstract
Human jejunum smooth muscle cells (SMCs) and interstitial cells of Cajal (ICCs) express the SCN5A-encoded voltage-gated, mechanosensitive sodium channel NaV1.5. NaV1.5 contributes to small bowel excitability, and NaV1.5 inhibitor ranolazine produces constipation by an unknown mechanism. We aimed to determine the presence and molecular identity of Na(+) current in the human colon smooth muscle and to examine the effects of ranolazine on Na(+) current, mechanosensitivity, and smooth muscle contractility. Inward currents were recorded by whole cell voltage clamp from freshly dissociated human colon SMCs at rest and with shear stress. SCN5A mRNA and NaV1.5 protein were examined by RT-PCR and Western blots, respectively. Ascending human colon strip contractility was examined in a muscle bath preparation. SCN5A mRNA and NaV1.5 protein were identified in human colon circular muscle. Freshly dissociated human colon SMCs had Na(+) currents (-1.36 ± 0.36 pA/pF), shear stress increased Na(+) peaks by 17.8 ± 1.8% and accelerated the time to peak activation by 0.7 ± 0.3 ms. Ranolazine (50 μM) blocked peak Na(+) current by 43.2 ± 9.3% and inhibited shear sensitivity by 25.2 ± 3.2%. In human ascending colon strips, ranolazine decreased resting tension (31%), reduced the frequency of spontaneous events (68%), and decreased the response to smooth muscle electrical field stimulation (61%). In conclusion, SCN5A-encoded NaV1.5 is found in human colonic circular smooth muscle. Ranolazine blocks both peak amplitude and mechanosensitivity of Na(+) current in human colon SMCs and decreases contractility of human colon muscle strips. Our data provide a likely mechanistic explanation for constipation induced by ranolazine.
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Affiliation(s)
- Leila Neshatian
- 1Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; ,2Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Peter R. Strege
- 1Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; ,2Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Poong-Lyul Rhee
- 4Division of Gastroenterology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; and
| | - Robert E. Kraichely
- 1Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; ,2Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Amelia Mazzone
- 1Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; ,2Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Cheryl E. Bernard
- 1Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; ,2Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Robert R. Cima
- 3Department of Colon and Rectal Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - David W. Larson
- 3Department of Colon and Rectal Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Eric J. Dozois
- 3Department of Colon and Rectal Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Crystal F. Kline
- 5The Dorothy M. Davis Heart and Lung Research Institute and Departments of Internal Medicine and Physiology & Cell Biology, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Peter J. Mohler
- 5The Dorothy M. Davis Heart and Lung Research Institute and Departments of Internal Medicine and Physiology & Cell Biology, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Arthur Beyder
- 1Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; ,2Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
| | - Gianrico Farrugia
- Enteric NeuroScience Program, Mayo Clinic College of Medicine, Rochester, Minnesota; Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota;
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8
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Little SC, Curran J, Makara MA, Kline CF, Ho HT, Xu Z, Wu X, Polina I, Musa H, Meadows AM, Carnes CA, Biesiadecki BJ, Davis JP, Weisleder N, Györke S, Wehrens XH, Hund TJ, Mohler PJ. Protein phosphatase 2A regulatory subunit B56α limits phosphatase activity in the heart. Sci Signal 2015. [PMID: 26198358 DOI: 10.1126/scisignal.aaa5876] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Protein phosphatase 2A (PP2A) is a serine/threonine-selective holoenzyme composed of a catalytic, scaffolding, and regulatory subunit. In the heart, PP2A activity is requisite for cardiac excitation-contraction coupling and central in adrenergic signaling. We found that mice deficient in the PP2A regulatory subunit B56α (1 of 13 regulatory subunits) had altered PP2A signaling in the heart that was associated with changes in cardiac physiology, suggesting that the B56α regulatory subunit had an autoinhibitory role that suppressed excess PP2A activity. The increase in PP2A activity in the mice with reduced B56α expression resulted in slower heart rates and increased heart rate variability, conduction defects, and increased sensitivity of heart rate to parasympathetic agonists. Increased PP2A activity in B56α(+/-) myocytes resulted in reduced Ca(2+) waves and sparks, which was associated with decreased phosphorylation (and thus decreased activation) of the ryanodine receptor RyR2, an ion channel on intracellular membranes that is involved in Ca(2+) regulation in cardiomyocytes. In line with an autoinhibitory role for B56α, in vivo expression of B56α in the absence of altered abundance of other PP2A subunits decreased basal phosphatase activity. Consequently, in vivo expression of B56α suppressed parasympathetic regulation of heart rate and increased RyR2 phosphorylation in cardiomyocytes. These data show that an integral component of the PP2A holoenzyme has an important inhibitory role in controlling PP2A enzyme activity in the heart.
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Affiliation(s)
- Sean C Little
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Jerry Curran
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Michael A Makara
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Crystal F Kline
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Hsiang-Ting Ho
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Zhaobin Xu
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Xiangqiong Wu
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Iuliia Polina
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Hassan Musa
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Allison M Meadows
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Cynthia A Carnes
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA
| | - Brandon J Biesiadecki
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Jonathan P Davis
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Noah Weisleder
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Sandor Györke
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA
| | - Xander H Wehrens
- Cardiovascular Research Institute, Departments of Molecular Physiology and Biophysics, and Medicine (Cardiology), Baylor College of Medicine, Houston, TX 77030, USA
| | - Thomas J Hund
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Peter J Mohler
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA. Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University, Columbus, OH 43210, USA.
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Sturm AC, Kline CF, Glynn P, Johnson BL, Curran J, Kilic A, Higgins RSD, Binkley PF, Janssen PML, Weiss R, Raman SV, Fowler SJ, Priori SG, Hund TJ, Carnes CA, Mohler PJ. Use of whole exome sequencing for the identification of Ito-based arrhythmia mechanism and therapy. J Am Heart Assoc 2015; 4:JAHA.114.001762. [PMID: 26015324 PMCID: PMC4599408 DOI: 10.1161/jaha.114.001762] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Identified genetic variants are insufficient to explain all cases of inherited arrhythmia. We tested whether the integration of whole exome sequencing with well-established clinical, translational, and basic science platforms could provide rapid and novel insight into human arrhythmia pathophysiology and disease treatment. METHODS AND RESULTS We report a proband with recurrent ventricular fibrillation, resistant to standard therapeutic interventions. Using whole-exome sequencing, we identified a variant in a previously unidentified exon of the dipeptidyl aminopeptidase-like protein-6 (DPP6) gene. This variant is the first identified coding mutation in DPP6 and augments cardiac repolarizing current (Ito) causing pathological changes in Ito and action potential morphology. We designed a therapeutic regimen incorporating dalfampridine to target Ito. Dalfampridine, approved for multiple sclerosis, normalized the ECG and reduced arrhythmia burden in the proband by >90-fold. This was combined with cilostazol to accelerate the heart rate to minimize the reverse-rate dependence of augmented Ito. CONCLUSIONS We describe a novel arrhythmia mechanism and therapeutic approach to ameliorate the disease. Specifically, we identify the first coding variant of DPP6 in human ventricular fibrillation. These findings illustrate the power of genetic approaches for the elucidation and treatment of disease when carefully integrated with clinical and basic/translational research teams.
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Affiliation(s)
- Amy C Sturm
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., P.F.B., R.W., S.V.R., T.J.H., P.J.M.)
| | - Crystal F Kline
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (C.F.K., J.C., P.L.J., P.J.M.)
| | - Patric Glynn
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Surgery, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (P.G., A.K., R.D.H.)
| | - Benjamin L Johnson
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.)
| | - Jerry Curran
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (C.F.K., J.C., P.L.J., P.J.M.)
| | - Ahmet Kilic
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Surgery, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (P.G., A.K., R.D.H.)
| | - Robert S D Higgins
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Surgery, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (P.G., A.K., R.D.H.)
| | - Philip F Binkley
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., P.F.B., R.W., S.V.R., T.J.H., P.J.M.)
| | - Paul M L Janssen
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (C.F.K., J.C., P.L.J., P.J.M.)
| | - Raul Weiss
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., P.F.B., R.W., S.V.R., T.J.H., P.J.M.)
| | - Subha V Raman
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., P.F.B., R.W., S.V.R., T.J.H., P.J.M.)
| | - Steven J Fowler
- Cardiovascular Genetics Program, Clinical Cardiac Electrophysiology, New York University Langone Medical Center, New York, NY (S.J.F., S.G.P.) Leon H. Charney Division of Cardiology, New York University Langone Medical Center, New York, NY (S.J.F.)
| | - Silvia G Priori
- Cardiovascular Genetics Program, Clinical Cardiac Electrophysiology, New York University Langone Medical Center, New York, NY (S.J.F., S.G.P.) Molecular Cardiology, IRCCS Fondazione Salvatore Maugeri, University of Pavia, Italy (S.G.P.) Department of Cardiology, University of Pavia, Italy (S.G.P.)
| | - Thomas J Hund
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., P.F.B., R.W., S.V.R., T.J.H., P.J.M.) Department of Biomedical Engineering, The Ohio State University, Columbus, OH (T.J.H.)
| | - Cynthia A Carnes
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) College of Pharmacy, Columbus, OH (C.A.C.)
| | - Peter J Mohler
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., C.F.K., P.G., B.L.J., J.C., A.K., R.D.H., P.F.B., P.L.J., R.W., S.V.R., T.J.H., C.A.C., P.J.M.) Department of Internal Medicine, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (A.C.S., P.F.B., R.W., S.V.R., T.J.H., P.J.M.) Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, The Ohio State University College of Engineering, Columbus, OH (C.F.K., J.C., P.L.J., P.J.M.)
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Curran J, Musa H, Kline CF, Makara MA, Little SC, Higgins JD, Hund TJ, Band H, Mohler PJ. Eps15 Homology Domain-containing Protein 3 Regulates Cardiac T-type Ca2+ Channel Targeting and Function in the Atria. J Biol Chem 2015; 290:12210-21. [PMID: 25825486 DOI: 10.1074/jbc.m115.646893] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Indexed: 11/06/2022] Open
Abstract
Proper trafficking of membrane-bound ion channels and transporters is requisite for normal cardiac function. Endosome-based protein trafficking of membrane-bound ion channels and transporters in the heart is poorly understood, particularly in vivo. In fact, for select cardiac cell types such as atrial myocytes, virtually nothing is known regarding endosomal transport. We previously linked the C-terminal Eps15 homology domain-containing protein 3 (EHD3) with endosome-based protein trafficking in ventricular cardiomyocytes. Here we sought to define the roles and membrane protein targets for EHD3 in atria. We identify the voltage-gated T-type Ca(2+) channels (CaV3.1, CaV3.2) as substrates for EHD3-dependent trafficking in atria. Mice selectively lacking EHD3 in heart display reduced expression and targeting of both Cav3.1 and CaV3.2 in the atria. Furthermore, functional experiments identify a significant loss of T-type-mediated Ca(2+) current in EHD3-deficient atrial myocytes. Moreover, EHD3 associates with both CaV3.1 and CaV3.2 in co-immunoprecipitation experiments. T-type Ca(2+) channel function is critical for proper electrical conduction through the atria. Consistent with these roles, EHD3-deficient mice demonstrate heart rate variability, sinus pause, and atrioventricular conduction block. In summary, our findings identify CaV3.1 and CaV3.2 as substrates for EHD3-dependent protein trafficking in heart, provide in vivo data on endosome-based trafficking pathways in atria, and implicate EHD3 as a key player in the regulation of atrial myocyte excitability and cardiac conduction.
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Affiliation(s)
- Jerry Curran
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology,
| | - Hassan Musa
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology
| | - Crystal F Kline
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology
| | - Michael A Makara
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology
| | - Sean C Little
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology
| | - John D Higgins
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology
| | - Thomas J Hund
- From the Dorothy M. Davis Heart and Lung Research Institute, Biomedical Engineering,The Ohio State University Wexner Medical Center, Columbus, Ohio 43210 and
| | - Hamid Band
- The Eppley Institute and UNMC-Eppley Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Peter J Mohler
- From the Dorothy M. Davis Heart and Lung Research Institute, the Departments of Physiology and Cell Biology, Medicine, and
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11
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Smith SA, Sturm AC, Curran J, Kline CF, Little SC, Bonilla IM, Long VP, Makara M, Polina I, Hughes LD, Webb TR, Wei Z, Wright P, Voigt N, Bhakta D, Spoonamore KG, Zhang C, Weiss R, Binkley PF, Janssen PM, Kilic A, Higgins RS, Sun M, Ma J, Dobrev D, Zhang M, Carnes CA, Vatta M, Rasband MN, Hund TJ, Mohler PJ. Dysfunction in the βII spectrin-dependent cytoskeleton underlies human arrhythmia. Circulation 2015; 131:695-708. [PMID: 25632041 DOI: 10.1161/circulationaha.114.013708] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND The cardiac cytoskeleton plays key roles in maintaining myocyte structural integrity in health and disease. In fact, human mutations in cardiac cytoskeletal elements are tightly linked to cardiac pathologies, including myopathies, aortopathies, and dystrophies. Conversely, the link between cytoskeletal protein dysfunction and cardiac electric activity is not well understood and often overlooked in the cardiac arrhythmia field. METHODS AND RESULTS Here, we uncover a new mechanism for the regulation of cardiac membrane excitability. We report that βII spectrin, an actin-associated molecule, is essential for the posttranslational targeting and localization of critical membrane proteins in heart. βII spectrin recruits ankyrin-B to the cardiac dyad, and a novel human mutation in the ankyrin-B gene disrupts the ankyrin-B/βII spectrin interaction, leading to severe human arrhythmia phenotypes. Mice lacking cardiac βII spectrin display lethal arrhythmias, aberrant electric and calcium handling phenotypes, and abnormal expression/localization of cardiac membrane proteins. Mechanistically, βII spectrin regulates the localization of cytoskeletal and plasma membrane/sarcoplasmic reticulum protein complexes, including the Na/Ca exchanger, ryanodine receptor 2, ankyrin-B, actin, and αII spectrin. Finally, we observe accelerated heart failure phenotypes in βII spectrin-deficient mice. CONCLUSIONS Our findings identify βII spectrin as critical for normal myocyte electric activity, link this molecule to human disease, and provide new insight into the mechanisms underlying cardiac myocyte biology.
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Affiliation(s)
- Sakima A Smith
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Amy C Sturm
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Jerry Curran
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Crystal F Kline
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Sean C Little
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Ingrid M Bonilla
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Victor P Long
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Michael Makara
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Iuliia Polina
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Langston D Hughes
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Tyler R Webb
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Zhiyi Wei
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Patrick Wright
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Niels Voigt
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Deepak Bhakta
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Katherine G Spoonamore
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Chuansheng Zhang
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Raul Weiss
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Philip F Binkley
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Paul M Janssen
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Ahmet Kilic
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Robert S Higgins
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Mingzhai Sun
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Jianjie Ma
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Dobromir Dobrev
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Mingjie Zhang
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Cynthia A Carnes
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Matteo Vatta
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Matthew N Rasband
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Thomas J Hund
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.)
| | - Peter J Mohler
- From Dorothy M. Davis Heart and Lung Research Institute (S.A.S., A.C.S., J.C., C.F.K., S.C.L., I.M.B., V.P.L., M.M., I.P., L.D.H., T.R.W., P.W., R.W., P.F.B., P.M.J., A.K., R.S.H., M.S., J.M., C.A.C., T.J.H., P.J.M.), Department of Internal Medicine, Division of Cardiovascular Medicine (S.A.S., R.W., P.F.B., P.J.M.), Department of Internal Medicine, Division of Human Genetics (A.C.S., P.M.J.), Department of Physiology and Cell Biology (J.C., C.F.K., S.C.L., M.M., I.P., L.D.H., T.R.W., P.W., P.M.J., P.J.M.), and Department of Surgery (A.K., R.S.H., M.S., J.M.), The Ohio State University Wexner Medical Center; Columbus; College of Pharmacy (I.M.B., V.P.L., C.A.C.) and Department of Biomedical Engineering, College of Engineering (T.J.H.), The Ohio State University, Columbus; Division of Life Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong (Z.W., M.Z.); Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, China (Z.W.); Institute of Pharmacology, Faculty of Medicine, University Duisburg-Essen, Essen, Germany (N.V., D.D.); Krannert Institute of Cardiology and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis (D.B., K.G.S., M.V.); and Department of Neuroscience, Baylor College of Medicine; Houston, TX (C.Z., M.N.R.).
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Abstract
Loss-of-function gene variants which affect the biophysical properties of ion channel proteins have long been associated with the destabilization of cardiac electrical activity, leading to human arrhythmia and sudden cardiac death. However, recent studies have also demonstrated the importance of ion channel/transporter-anchoring molecules for normal cardiac function. Ankyrins are a family of membrane adaptor proteins whose role in metazoan physiology has been elucidated over the last quarter of a century, but with great strides taken in the last half decade with regard to cardiac cell physiology. The association of dysfunction in ankyrin-based cellular pathways with abnormal human cardiac function represents a surprising turn in the genetics of arrhythmias and sudden cardiac death, demonstrating an exciting new player in the field of 'channelopathies'.
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Affiliation(s)
- Crystal F Kline
- Vanderbilt University School of Medicine, Graduate Program in Pathology, Nashville, TN 37232, USA.
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13
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Abstract
N-type and P/Q-type calcium channels are documented players in the regulation of synaptic function; however, the mechanisms underlying their expression and cellular targeting are poorly understood. Ankyrin polypeptides are essential for normal integral membrane protein expression in a number of cell types, including neurons, cardiomyocytes, epithelia, secretory cells, and erythrocytes. Ankyrin dysfunction has been linked to defects in integral protein expression, abnormal cellular function, and disease. Here, we demonstrate that ankyrin-B associates with Cav2.1 and Cav2.2 in cortex, cerebellum, and brain stem. Additionally, using in vitro and in vivo techniques, we demonstrate that ankyrin-B, via its membrane-binding domain, associates with a highly conserved motif in the DII/III loop domain of Cav2.1 and Cav2.2. Further, we demonstrate that this domain is necessary for proper targeting of Cav2.1 and Cav2.2 in a heterologous system. Finally, we demonstrate that mutation of a single conserved tyrosine residue in the ankyrin-binding motif of both Cav2.1 (Y797E) and Cav2.2 (Y788E) results in loss of association with ankyrin-B in vitro and in vivo. Collectively, our findings identify an interaction between ankyrin-B and both Cav2.1 and Cav2.2 at the amino acid level that is necessary for proper Cav2.1 and Cav2.2 targeting in vivo.
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14
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Kline CF, Mohler PJ. Defective interactions of protein partner with ion channels and transporters as alternative mechanisms of membrane channelopathies. Biochim Biophys Acta 2013; 1838:723-30. [PMID: 23732236 DOI: 10.1016/j.bbamem.2013.05.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 05/15/2013] [Accepted: 05/21/2013] [Indexed: 01/27/2023]
Abstract
The past twenty years have revealed the existence of numerous ion channel mutations resulting in human pathology. Ion channels provide the basis of diverse cellular functions, ranging from hormone secretion, excitation-contraction coupling, cell signaling, immune response, and trans-epithelial transport. Therefore, the regulation of biophysical properties of channels is vital in human physiology. Only within the last decade has the role of non-ion channel components come to light in regard to ion channel spatial, temporal, and biophysical regulation in physiology. A growing number of auxiliary components have been determined to play elemental roles in excitable cell physiology, with dysfunction resulting in disorders and related manifestations. This review focuses on the broad implications of such dysfunction, focusing on disease-causing mutations that alter interactions between ion channels and auxiliary ion channel components in a diverse set of human excitable cell disease. This article is part of a Special Issue entitled: Reciprocal influences between cell cytoskeleton and membrane channels, receptors and transporters. Guest Editor: Jean Claude Hervé
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Affiliation(s)
- Crystal F Kline
- The Dorothy M. Davis Heart and Lung Research Institute, Department of Internal Medicine, Division of Cardiovascular Medicine, Department of Physiology & Cell Biology, The Ohio State University Wexner Medical Center, USA
| | - Peter J Mohler
- The Dorothy M. Davis Heart and Lung Research Institute, Department of Internal Medicine, Division of Cardiovascular Medicine, Department of Physiology & Cell Biology, The Ohio State University Wexner Medical Center, USA.
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15
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Abstract
The vertebrate cardiac myocyte has evolved a highly organized cellular membrane architecture and cell-cell contacts in order to effectively transmit precisely timed and homogeneous depolarizing waves without failure (>2 billion times/human life span). Two unique specialized membrane domains, the intercalated disc and the transverse tubule (T-tubule), function to ensure the rapid and coordinated propagation of the action potential throughout the heart. Based on their critical roles in structure, signaling, and electric inter- and intracellular communication, it is not surprising that dysfunction in these membrane structures is associated with aberrant vertebrate physiology, resulting in potentially fatal congenital and acquired disease. This chapter will review the fundamental components of cardiomyocyte intercalated disc and transverse-tubule membranes with a focus on linking dysfunction in these membranes with human cardiovascular disease.
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Affiliation(s)
- Crystal F Kline
- The Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
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16
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Sierra A, Zhu Z, Sapay N, Sharotri V, Kline CF, Luczak ED, Subbotina E, Sivaprasadarao A, Snyder PM, Mohler PJ, Anderson ME, Vivaudou M, Zingman LV, Hodgson-Zingman DM. Regulation of cardiac ATP-sensitive potassium channel surface expression by calcium/calmodulin-dependent protein kinase II. J Biol Chem 2012; 288:1568-81. [PMID: 23223335 DOI: 10.1074/jbc.m112.429548] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Cardiac ATP-sensitive potassium (K(ATP)) channels are key sensors and effectors of the metabolic status of cardiomyocytes. Alteration in their expression impacts their effectiveness in maintaining cellular energy homeostasis and resistance to injury. We sought to determine how activation of calcium/calmodulin-dependent protein kinase II (CaMKII), a central regulator of calcium signaling, translates into reduced membrane expression and current capacity of cardiac K(ATP) channels. We used real-time monitoring of K(ATP) channel current density, immunohistochemistry, and biotinylation studies in isolated hearts and cardiomyocytes from wild-type and transgenic mice as well as HEK cells expressing wild-type and mutant K(ATP) channel subunits to track the dynamics of K(ATP) channel surface expression. Results showed that activation of CaMKII triggered dynamin-dependent internalization of K(ATP) channels. This process required phosphorylation of threonine at 180 and 224 and an intact (330)YSKF(333) endocytosis motif of the K(ATP) channel Kir6.2 pore-forming subunit. A molecular model of the μ2 subunit of the endocytosis adaptor protein, AP2, complexed with Kir6.2 predicted that μ2 docks by interaction with (330)YSKF(333) and Thr-180 on one and Thr-224 on the adjacent Kir6.2 subunit. Phosphorylation of Thr-180 and Thr-224 would favor interactions with the corresponding arginine- and lysine-rich loops on μ2. We concluded that calcium-dependent activation of CaMKII results in phosphorylation of Kir6.2, which promotes endocytosis of cardiac K(ATP) channel subunits. This mechanism couples the surface expression of cardiac K(ATP) channels with calcium signaling and reveals new targets to improve cardiac energy efficiency and stress resistance.
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Affiliation(s)
- Ana Sierra
- Department of Internal Medicine, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242, USA
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Hund TJ, Koval OM, Li J, Wright PJ, Qian L, Snyder JS, Gudmundsson H, Kline CF, Davidson NP, Cardona N, Rasband MN, Anderson ME, Mohler PJ. A β(IV)-spectrin/CaMKII signaling complex is essential for membrane excitability in mice. J Clin Invest 2010; 120:3508-19. [PMID: 20877009 DOI: 10.1172/jci43621] [Citation(s) in RCA: 210] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Accepted: 07/28/2010] [Indexed: 02/04/2023] Open
Abstract
Ion channel function is fundamental to the existence of life. In metazoans, the coordinate activities of voltage-gated Na(+) channels underlie cellular excitability and control neuronal communication, cardiac excitation-contraction coupling, and skeletal muscle function. However, despite decades of research and linkage of Na(+) channel dysfunction with arrhythmia, epilepsy, and myotonia, little progress has been made toward understanding the fundamental processes that regulate this family of proteins. Here, we have identified β(IV)-spectrin as a multifunctional regulatory platform for Na(+) channels in mice. We found that β(IV)-spectrin targeted critical structural and regulatory proteins to excitable membranes in the heart and brain. Animal models harboring mutant β(IV)-spectrin alleles displayed aberrant cellular excitability and whole animal physiology. Moreover, we identified a regulatory mechanism for Na(+) channels, via direct phosphorylation by β(IV)-spectrin-targeted calcium/calmodulin-dependent kinase II (CaMKII). Collectively, our data define an unexpected but indispensable molecular platform that determines membrane excitability in the mouse heart and brain.
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Affiliation(s)
- Thomas J Hund
- Department of Internal Medicine, Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, USA.
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Abstract
Ankyrin polypeptides are critical for normal membrane protein expression in diverse cell types, including neurons, myocytes, epithelia, and erythrocytes. Ankyrin dysfunction results in defects in membrane expression of ankyrin-binding partners (including ion channels, transporters, and cell adhesion molecules), resulting in aberrant cellular function and disease. Here, we identify a new role for ankyrin-B in cardiac cell biology. We demonstrate that cardiac sarcolemmal K(ATP) channels directly associate with ankyrin-B in heart via the K(ATP) channel alpha-subunit Kir6.2. We demonstrate that primary myocytes lacking ankyrin-B display defects in Kir6.2 protein expression, membrane expression, and function. Moreover, we demonstrate a secondary role for ankyrin-B in regulating K(ATP) channel gating. Finally, we demonstrate that ankyrin-B forms a membrane complex with K(ATP) channels and the cardiac Na/K-ATPase, a second key membrane transporter involved in the cardiac ischemia response. Collectively, our new findings define a new role for cardiac ankyrin polypeptides in regulation of ion channel membrane expression in heart.
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Affiliation(s)
- Jingdong Li
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, USA
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Gudmundsson H, Hund TJ, Wright PJ, Kline CF, Snyder JS, Qian L, Koval OM, Cunha SR, George M, Rainey MA, Kashef FE, Dun W, Boyden PA, Anderson ME, Band H, Mohler PJ. EH domain proteins regulate cardiac membrane protein targeting. Circ Res 2010; 107:84-95. [PMID: 20489164 DOI: 10.1161/circresaha.110.216713] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
RATIONALE Cardiac membrane excitability is tightly regulated by an integrated network of membrane-associated ion channels, transporters, receptors, and signaling molecules. Membrane protein dynamics in health and disease are maintained by a complex ensemble of intracellular targeting, scaffolding, recycling, and degradation pathways. Surprisingly, despite decades of research linking dysfunction in membrane protein trafficking with human cardiovascular disease, essentially nothing is known regarding the molecular identity or function of these intracellular targeting pathways in excitable cardiomyocytes. OBJECTIVE We sought to discover novel pathways for membrane protein targeting in primary cardiomyocytes. METHODS AND RESULTS We report the initial characterization of a large family of membrane trafficking proteins in human heart. We used a tissue-wide screen for novel ankyrin-associated trafficking proteins and identified 4 members of a unique Eps15 homology (EH) domain-containing protein family (EHD1, EHD2, EHD3, EHD4) that serve critical roles in endosome-based membrane protein targeting in other cell types. We show that EHD1-4 directly associate with ankyrin, provide the first information on the expression and localization of these molecules in primary cardiomyocytes, and demonstrate that EHD1-4 are coexpressed with ankyrin-B in the myocyte perinuclear region. Notably, the expression of multiple EHD proteins is increased in animal models lacking ankyrin-B, and EHD3-deficient cardiomyocytes display aberrant ankyrin-B localization and selective loss of Na/Ca exchanger expression and function. Finally, we report significant modulation of EHD expression following myocardial infarction, suggesting that these proteins may play a key role in regulating membrane excitability in normal and diseased heart. CONCLUSIONS Our findings identify and characterize a new class of cardiac trafficking proteins, define the first group of proteins associated with the ankyrin-based targeting network, and identify potential new targets to modulate membrane excitability in disease. Notably, these data provide the first link between EHD proteins and a human disease model.
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Affiliation(s)
- Hjalti Gudmundsson
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, USA
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20
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Abstract
K(ATP) channels play critical roles in many cellular functions by coupling cell metabolic status to electrical activity. First discovered in cardiomyocytes,(1) K(ATP) channels (comprised of Kir6.x and SUR subunits) have since been found in many other tissues, including pancreatic beta cells, skeletal muscle, smooth muscle, brain, pituitary and kidney. By linking cellular metabolic state with membrane potential, K(ATP) channels are able to regulate a number of cellular functions such as hormone secretion, vascular tone and excitability. Specifically, a reduction in metabolism causes a decrease in the ATP:ADP ratio, opening of K(ATP) channels, K(+) efflux, membrane hyperpolarization, and suppression of electrical activity. Conversely, increased cellular metabolism causes an increase in the ATP:ADP ratio that leads to closure of the K(ATP) channel, membrane depolarization, and stimulation of cell electrical activity.
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Affiliation(s)
- Crystal F Kline
- Department of Internal Medicine, Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA
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Kline CF, Mohler PJ. From Fifth Business to Protagonist: the complex roles of ion channel anchors in cardiac arrhythmia. Drug Discov Today Dis Models 2009; 6:63-69. [PMID: 20689672 PMCID: PMC2913888 DOI: 10.1016/j.ddmod.2009.07.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Proper regulation of cardiac ion channel activity is critical for cellular ion homeostasis and myocyte electrical activity. Recent work has demonstrated that cardiac ion channels are not isolated pores in plasmid membranes, but rather exist within macromolecular signaling complexes. Moreover, within these macro-complexes resides the machinery to finely tune ion channel expression, activity, and signaling. While it is widely-accepted that mutations in ion channel pore-forming genes underlie a number of cardiac arrhythmias, current research is now focusing on the roles of auxiliary subunits in the development of arrhythmia syndromes.
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Affiliation(s)
- Crystal F Kline
- Department of Medicine and Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, University of Iowa, Iowa City, IA 52242
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Kline CF, Cunha SR, Lowe JS, Hund TJ, Mohler PJ. Revisiting ankyrin-InsP3 receptor interactions: ankyrin-B associates with the cytoplasmic N-terminus of the InsP3 receptor. J Cell Biochem 2008; 104:1244-53. [PMID: 18275062 DOI: 10.1002/jcb.21704] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Inositol 1,4,5-trisphosphate (InsP(3)) receptors are calcium-release channels found in the endoplasmic/sarcoplasmic reticulum (ER/SR) membrane of diverse cell types. InsP(3) receptors release Ca(2+) from ER/SR lumenal stores in response to InsP(3) generated from various stimuli. The complex spatial and temporal patterns of InsP(3) receptor-mediated Ca(2+) release regulate many cellular processes, ranging from gene transcription to memory. Ankyrins are adaptor proteins implicated in the targeting of ion channels and transporters to specialized membrane domains. Multiple independent studies have documented in vitro and in vivo interactions between ankyrin polypeptides and the InsP(3) receptor. Moreover, loss of ankyrin-B leads to loss of InsP(3) receptor membrane expression and stability in cardiomyocytes. Despite extensive biochemical and functional data, the validity of in vivo ankyrin-InsP(3) receptor interactions remains controversial. This controversy is based on inconsistencies between a previously identified ankyrin-binding region on the InsP(3) receptor and InsP(3) receptor topology data that demonstrate the inaccessibility of this lumenal binding site on the InsP(3) receptor to cytosolic ankyrin polypeptides. Here we use two methods to revisit the requirements on InsP(3) receptor for ankyrin binding. We demonstrate that ankyrin-B interacts with the cytoplasmic N-terminal domain of InsP(3) receptor. In summary, our findings demonstrate that the ankyrin-binding site is located on the cytoplasmic face of the InsP(3) receptor, thus validating the feasibility of in vivo ankyrin-InsP(3) receptor interactions.
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Affiliation(s)
- Crystal F Kline
- Department of Internal Medicine, Division of Cardiology, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, USA
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Mohler PJ, Healy JA, Xue H, Puca AA, Kline CF, Rand Allingham R, Kranias EG, Rockman HA, Bennett V. Ankyrin-B syndrome: enhanced cardiac function balanced by risk of cardiac death and premature senescence. PLoS One 2007; 2:e1051. [PMID: 17940615 PMCID: PMC2013943 DOI: 10.1371/journal.pone.0001051] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Accepted: 09/20/2007] [Indexed: 12/21/2022] Open
Abstract
Here we report the unexpected finding that specific human ANK2 variants represent a new example of balanced human variants. The prevalence of certain ANK2 (encodes ankyrin-B) variants range from 2 percent of European individuals to 8 percent in individuals from West Africa. Ankyrin-B variants associated with severe human arrhythmia phenotypes (eg E1425G, V1516D, R1788W) were rare in the general population. Variants associated with less severe clinical and in vitro phenotypes were unexpectedly common. Studies with the ankyrin-B+/− mouse reveal both benefits of enhanced cardiac contractility, as well as costs in earlier senescence and reduced lifespan. Together these findings suggest a constellation of traits that we term “ankyrin-B syndrome”, which may contribute to both aging-related disorders and enhanced cardiac function.
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Affiliation(s)
- Peter J. Mohler
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- * To whom correspondence should be addressed. E-mail: (PM); (VB)
| | - Jane A. Healy
- Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Biochemistry, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Hui Xue
- Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Annibale A. Puca
- Istituti di Ricovero e Cura a Carattere Scientifico (IRCCS) Policlinico MultiMedica, Milan, Italy
| | - Crystal F. Kline
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - R. Rand Allingham
- Department of Ophthalmology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Evangelia G. Kranias
- Department of Pharmacology and Cell Biophysics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Howard A. Rockman
- Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Vann Bennett
- Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Biochemistry, Duke University Medical Center, Durham, North Carolina, United States of America
- * To whom correspondence should be addressed. E-mail: (PM); (VB)
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