期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5664
关键词
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资金
- Agence Nationale pour la Recherche [ANR-06-PHISIO-004-01, ANR-2010-BLAN-1128-01, ANR-09-GENO-034, ANR-13-BSV1-0023-02]
- NIH [R01HL087120-A2, R01HL105550]
- Fondation de France [2008002730]
- Fondation pour la Recherche Medicale [DPC20111122986]
- Deutsche Forschungsgemeinschaft [IS63/1-1/2, IS63/3-1/2]
- DFG [FOR 604, Es 88/10-1]
- CavNet, a Research Training Network (RTN) through the European Union Research Programme (6FP) [MRTN-CT-2006-035367]
- Fondation Lefoulon-Delalande
- ANR [ANR-11-LABX-0015]
The mechanisms underlying cardiac automaticity are still incompletely understood and controversial. Here we report the complete conditional and time-controlled silencing of the 'funny' current (If) by expression of a dominant-negative, non-conductive HCN4-channel subunit (hHCN4-AYA). Heart-specific I-f silencing caused altered [Ca2+](i) release and Ca2+ handling in the sinoatrial node, impaired pacemaker activity and symptoms reminiscent of severe human disease of pacemaking. The effects of I-f silencing critically depended on the activity of the autonomic nervous system. We were able to rescue the failure of impulse generation and conduction by additional genetic deletion of cardiac muscarinic G-protein-activated (GIRK4) channels in I-f-deficient mice without impairing heartbeat regulation. Our study establishes the role of f-channels in cardiac automaticity and indicates that arrhythmia related to HCN loss-of-function may be managed by pharmacological or genetic inhibition of GIRK4 channels, thus offering a new therapeutic strategy for the treatment of heart rhythm diseases.
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