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Apelin regulates the electrophysiological characteristics of atrial myocytes
Author(s) -
Cheng ChenChuan,
Weerateerangkul Punate,
Lu YenYu,
Chen YaoChang,
Lin YungKuo,
Chen ShihAnn,
Chen YiJen
Publication year - 2013
Publication title -
european journal of clinical investigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.164
H-Index - 107
eISSN - 1365-2362
pISSN - 0014-2972
DOI - 10.1111/eci.12012
Subject(s) - apelin , myocyte , medicine , electrophysiology , chemistry , repolarization , patch clamp , endocrinology , membrane potential , atrial myocytes , cardiac transient outward potassium current , biophysics , calcium , potassium channel , atrium (architecture) , inward rectifier potassium ion channel , cardiology , ion channel , biology , receptor , biochemistry , atrial fibrillation
Eur J Clin Invest 2012 Abstract Backgroud Apelin, a potential agent for treating heart failure, has various ionic effects on ventricular myocytes. However, the effects of apelin on the atrium are not clear. The purpose of this study was to investigate the acute effects of apelin on the electrophysiological characteristics of atrial myocytes. Method Whole‐cell patch‐clamp techniques were used to investigate the action potential (AP) and ionic currents in isolated rabbit left atrial (LA) myocytes before and after the administration of apelin. Result Apelin reduced LA AP duration measured at 90%, 50% and 20% repolarization of the amplitude by 11 ± 3%, 24 ± 5%, 30 ± 7% at 1 nM ( n = 11), and by 14 ± 4%, 36 ± 6% and 45 ± 5% at 10 nM ( n = 11), but not at 0·1 nM. Apeline (0·1, 1, 10 nM) did not change the amplitude, or resting membrane potential in LA myocytes. Apelin (1 nM) increased sodium currents, ultra‐rapid potassium currents and the reverse mode of sodium‐calcium exchanger currents, but decreased late sodium currents and L‐type calcium currents and did not change transient outward currents or inward rectifier potassium currents in LA myocytes. Conclusions Apelin significantly changed the atrial electrophysiology with a shortening of AP duration, which may be caused by its effects on multiple ionic currents.