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苄基四氢巴马汀对大鼠心室肌细胞瞬时外向钾电流的影响
引用本文:李 泱,傅丽英,姚伟星,夏国瑾,江明性. 苄基四氢巴马汀对大鼠心室肌细胞瞬时外向钾电流的影响[J]. 中国药理学与毒理学杂志, 2001, 15(5): 358-361
作者姓名:李 泱  傅丽英  姚伟星  夏国瑾  江明性
作者单位:(华中科技大学同济医学院 1.同济医院心内科, 2. 药理学教研室, 湖北 武汉 430030)
摘    要:利用全细胞膜片钳技术测定大鼠心室肌细胞的Ito, 研究苄基四氢巴马汀(BTHP)对大鼠心室肌瞬时外向钾电流 (Ito) 的影响. 结果显示,5.0 μmol·L-1 BTHP可以降低Ito, 使Ito幅值从(13.8±2.2)pA·pF-1降至(5.1±1.4)pA·pF-1P<0.01). 在1~100 μmol·L-1范围内BTHP的作用呈浓度依赖性,IC50为3.6 μmol·L-1,该药不改变Ito 电流-电压曲线的形状,而使电流幅值减少. 5.0 μmol·L-1 BTHP使稳态激活曲线右移,半激活电压(V1/2)从(-6.8±0.2)mV移至(-1.5±0.1)mV,但曲线斜率基本不变. BTHP对失活曲线影响不大,5.0 μmol·L-1 BTHP使通道失活后恢复时间常数从(75±19)ms延长为 (119±21)ms(P<0.01). 结果说明,BTHP浓度依赖地阻滞大鼠心室肌细胞的Ito.

关 键 词:抗心律失常药  苄基四氢巴马汀  心肌  钾电流  膜片钳技术
收稿时间:2001-01-18

Effect of benzyltetrahydropalmatine on transient outward potassium current in rat ventricular myocytes
LI Yang, FU Li-Ying, YAO Wei-Xing, XIA Guo-Jin, JIANG Ming-Xing. Effect of benzyltetrahydropalmatine on transient outward potassium current in rat ventricular myocytes[J]. Chinese Journal of Pharmacology and Toxicology, 2001, 15(5): 358-361
Authors:LI Yang   FU Li-Ying   YAO Wei-Xing   XIA Guo-Jin   JIANG Ming-Xing
Affiliation:LI Yang1, FU Li-Ying2, YAO Wei-Xing2, XIA Guo-Jin2, JIANG Ming-Xing2
Abstract:To investigate the effects of benzyltetrahydropalmatine (BTHP) on the transient outward potassium currents(Ito), Ito were recorded in rat single ventricular myocytes by using whole cell patch clamp technique. The results showed that 5.0 μmol·L-1 BTHP significantly reduced Ito from (13.8±2.2)pA·pF-1 to (5.1±1.4)pA·pF-1(P<0.01,n=6). BTHP 1-100 μmol·L-1 reduced Ito in a concentration- dependent manner, IC50 was 3.6 μmol·L-1. Furthermore, 5.0 μmol·L-1 BTHP shifted the half-point of activation potential (V1/2)from (-6.8±0.2 )mV to (-1.5±0.1)mV. BTHP increased the recovery time constant (τ) from(75±19)ms to (119±21)ms (P<0.01,n=6). The results indicate that BTHP inhibits Ito in a concentration- dependent manner.
Keywords:anti-arrhythmia agents  benzyltetrahydropalmatine  myocardium  potassium current  patch clamp technique
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