Leptin modulates electrophysiological characteristics and isoproterenol-induced arrhythmogenesis in atrial myocytes

Yung Kuo Lin, Yao Chang Chen, Jen Hung Huang, Yenn Jiang Lin, Shiang Suo Huang, Shih Ann Chen, Yi Jen Chen

研究成果: 雜誌貢獻文章同行評審

10 引文 斯高帕斯(Scopus)

摘要

Background: Obesity is an important risk factor for atrial fibrillation (AF). Leptin is an important adipokine. However, it is not clear whether leptin directly modulates the electrophysiological characteristics of atrial myocytes. Results: Whole cell patch clamp and indo-1 fluorescence were used to record the action potentials (APs) and ionic currents in isolated rabbit left atrial (LA) myocytes incubated with and without (control) leptin (100 nM) for 1 h to investigate the role of leptin on atrial electrophysiology. Leptin-treated LA myocytes (n = 19) had longer 20% of AP duration (28 ± 3 vs. 21 ± 2 ms, p <0.05), but similar 50% of AP duration (51 ± 4 vs. 50 ± 3 ms, p > 0.05), and 90% of AP duration (89 ± 5 vs. 94 ± 4 ms, p > 0.05), as compared to the control (n = 22). In the presence of isoproterenol (10 nM), leptin-treated LA myocytes (n = 21) showed a lower incidence (19% vs. 54.2%, p <0.05) of delayed afterdepolarization (DAD) than the control (n = 24). Leptin-treated LA myocytes showed a larger sodium current, but a smaller ultra-rapid delayed rectifier potassium current, and sodium-calcium exchanger current than the control. Leptin-treated and control LA myocytes exhibited a similar late sodium current, inward rectifier potassium current, transient outward current and L-type calcium current. In addition, the leptin-treated LA myocytes (n = 38) exhibited a smaller intracellular Ca§ssup§2+§esup§ transient (0.21 ± 0.01 vs. 0.26 ± 0.01 R410/485, p <0.05) and sarcoplasmic reticulum Ca§ssup§2+§esup§ content (0.35 ± 0.02 vs. 0.43 ± 0.03 R410/485, p <0.05) than the control LA myocytes (n = 42). Conclusions: Leptin regulates the LA electrophysiological characteristics and attenuates isoproterenol-induced arrhythmogenesis.

原文英語
文章編號94
期刊Journal of Biomedical Science
20
發行號1
DOIs
出版狀態已發佈 - 十二月 20 2013

ASJC Scopus subject areas

  • 臨床生物化學
  • 分子生物學
  • 細胞生物學
  • 生物化學(醫學)
  • 內分泌學、糖尿病和代謝
  • 藥學(醫學)

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