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Yampolsky P, Koenen M, Mosqueira M, Geschwill P, Nauck S, Witzenberger M, Seyler C, Fink T, Kruska M, Bruehl C, Schwoerer AP, Ehmke H, Fink RHA, Draguhn A, Thomas D, Katus HA, Schweizer PA. Augmentation of myocardial I f dysregulates calcium homeostasis and causes adverse cardiac remodeling. Nat Commun 2019; 10:3295. [PMID: 31337768 PMCID: PMC6650438 DOI: 10.1038/s41467-019-11261-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 06/28/2019] [Indexed: 01/18/2023] Open
Abstract
HCN channels underlie the depolarizing funny current (If) that contributes importantly to cardiac pacemaking. If is upregulated in failing and infarcted hearts, but its implication in disease mechanisms remained unresolved. We generated transgenic mice (HCN4tg/wt) to assess functional consequences of HCN4 overexpression-mediated If increase in cardiomyocytes to levels observed in human heart failure. HCN4tg/wt animals exhibit a dilated cardiomyopathy phenotype with increased cellular arrhythmogenicity but unchanged heart rate and conduction parameters. If augmentation induces a diastolic Na+ influx shifting the Na+/Ca2+ exchanger equilibrium towards 'reverse mode' leading to increased [Ca2+]i. Changed Ca2+ homeostasis results in significantly higher systolic [Ca2+]i transients and stimulates apoptosis. Pharmacological inhibition of If prevents the rise of [Ca2+]i and protects from ventricular remodeling. Here we report that augmented myocardial If alters intracellular Ca2+ homeostasis leading to structural cardiac changes and increased arrhythmogenicity. Inhibition of myocardial If per se may constitute a therapeutic mechanism to prevent cardiomyopathy.
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Affiliation(s)
- Pessah Yampolsky
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- Department of Molecular Neurology, Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
| | - Michael Koenen
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- Department of Molecular Neurology, Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
| | - Matias Mosqueira
- Division of Medical Biophysics, Institute of Physiology and Pathophysiology, Heidelberg University, Im Neuenheimer Feld 326, 69120, Heidelberg, Germany
| | - Pascal Geschwill
- Division of Neuro- and Sensory Physiology, Institute of Physiology and Pathophysiology, Heidelberg University, Im Neuenheimer Feld 326, 69120, Heidelberg, Germany
| | - Sebastian Nauck
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Monika Witzenberger
- Division of Medical Biophysics, Institute of Physiology and Pathophysiology, Heidelberg University, Im Neuenheimer Feld 326, 69120, Heidelberg, Germany
| | - Claudia Seyler
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Thomas Fink
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Mathieu Kruska
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Claus Bruehl
- Division of Neuro- and Sensory Physiology, Institute of Physiology and Pathophysiology, Heidelberg University, Im Neuenheimer Feld 326, 69120, Heidelberg, Germany
| | - Alexander P Schwoerer
- Department of Cellular and Integrative Physiology, University Medical Centre Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research) partner site Hamburg/Kiel/Lübeck, Martinistrasse 52, 20246, Hamburg, Germany
| | - Heimo Ehmke
- Department of Cellular and Integrative Physiology, University Medical Centre Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research) partner site Hamburg/Kiel/Lübeck, Martinistrasse 52, 20246, Hamburg, Germany
| | - Rainer H A Fink
- Division of Medical Biophysics, Institute of Physiology and Pathophysiology, Heidelberg University, Im Neuenheimer Feld 326, 69120, Heidelberg, Germany
| | - Andreas Draguhn
- Division of Neuro- and Sensory Physiology, Institute of Physiology and Pathophysiology, Heidelberg University, Im Neuenheimer Feld 326, 69120, Heidelberg, Germany
| | - Dierk Thomas
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Hugo A Katus
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Patrick A Schweizer
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
- DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
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