K2P1 leak cation channels contribute to ventricular ectopic beats and sudden death under hypokalemia
|Corresponding Author||Liu，Zheng; Chen，Haijun|
Hypokalemia causes ectopic heartbeats, but the mechanisms underlying such cardiac arrhythmias are not understood. In reduced serum K concentrations that occur under hypokalemia, K2P1 two-pore domain K channels change ion selectivity and switch to conduct inward leak cation currents, which cause aberrant depolarization of resting potential and induce spontaneous action potential of human cardiomyocytes. K2P1 is expressed in the human heart but not in mouse hearts. We test the hypothesis that K2P1 leak cation channels contribute to ectopic heartbeats under hypokalemia, by analysis of transgenic mice, which conditionally express induced K2P1 specifically in hearts, mimicking K2P1 channels in the human heart. Conditional expression of induced K2P1 specifically in the heart of hypokalemic mice results in multiple types of ventricular ectopic beats including single and multiple ventricular premature beats as well as ventricular tachycardia and causes sudden death. In isolated mouse hearts that express induced K2P1, sustained ventricular fibrillation occurs rapidly after perfusion with low K concentration solutions that mimic hypokalemic conditions. These observed phenotypes occur rarely in control mice or in the hearts that lack K2P1 expression. K2P1-expressing mouse cardiomyocytes of transgenic mice much more frequently fire abnormal single and/or rhythmic spontaneous action potential in hypokalemic conditions, compared to wild type mouse cardiomyocytes without K2P1 expression. These findings confirm that K2P1 leak cation channels induce ventricular ectopic beats and sudden death of transgenic mice with hypokalemia and imply that K2P1 leak cation channels may play a critical role in human ectopic heartbeats under hypokalemia.
American Heart Association[11GRNT7270014] ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
|WOS Accession No|
|ESI Research Field|
BIOLOGY & BIOCHEMISTRY
Cited Times [WOS]:1
|Document Type||Journal Article|
|Department||Cryo-Electron Microscopy Center|
1.Department of Cardiology,Shanghai Tenth People's Hospital,Tongji University School of Medicine,Shanghai,China
2.Pan-Vascular Research Institute,Heart,Lung,and Blood Center,Tongji University School of Medicine,Shanghai,China
3.Key Laboratory of Medical Electrophysiology,Institute of Cardiovascular Research,Ministry of Education,Collaborative Innovation Center for Prevention and Treatment of Cardiovascular Disease,Southwest Medical University,Luzhou,China
4.Department of Biological Sciences,University at Albany,State University of New York,Albany,United States
5.Department of Pharmacology,Ningbo University School of Medicine,Ningbo,China
6.Key Laboratory for Translational Research and Innovative Therapeutics of Gastrointestinal Oncology,Tongren Hospital,Shanghai Jiao Tong University School of Medicine,Shanghai,China
7.Cryo-Electron Microscopy Center,Southern University of Science and Technology,Shenzhen,China
|Corresponding Author Affilication||Cryo-Electron Microscopy Center|
Shen，Rongrong,Zuo，Dongchuan,Chen，Kuihao,et al. K2P1 leak cation channels contribute to ventricular ectopic beats and sudden death under hypokalemia[J]. FASEB JOURNAL,2022,36(8):e22455.
Shen，Rongrong.,Zuo，Dongchuan.,Chen，Kuihao.,Yin，Yiheng.,Tang，Kai.,...&Chen，Haijun.(2022).K2P1 leak cation channels contribute to ventricular ectopic beats and sudden death under hypokalemia.FASEB JOURNAL,36(8),e22455.
Shen，Rongrong,et al."K2P1 leak cation channels contribute to ventricular ectopic beats and sudden death under hypokalemia".FASEB JOURNAL 36.8(2022):e22455.
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