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The ion targets of arrhythmias induced by ouabain and aconitine in guinea pig and rat ventricular myocytes
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- Author:
- No author available
- Journal Title:
- ACTA PHARMACEUTICA SINICA
- Issue:
- 5
- DOI:
- 10.3321/j.issn:0513-4870.2004.05.003
- Key Word:
- 哇巴因;乌头碱;钙电流;外向钾电流;APD;心律失常
Abstract： 目的观察哇巴因和乌头碱对豚鼠和大鼠心肌单细胞离子通道的作用,确定两药诱发心律失常时离子靶点和最佳靶点,建立细胞水平的心律失常模型.方法用全细胞膜片钳技术记录哇巴因和乌头碱对酶解法分离的豚鼠和大鼠心肌细胞离子通道的作用.结果 5μmol·L-1哇巴因使豚鼠心肌细胞APD延长、ICa-1增加、Ik减少、Ik1减少;1μmol·L-1乌头碱使大鼠心肌细胞APD延长、ICa-1增加、Ito减少、Ik1增加.结论哇巴因和乌头碱诱发心律失常的离子靶点有APD,ICa-1,Ik,Ito和Ik1,而最佳靶点应为APD,ICa-1,Ik和Ito.在单细胞水平分别应用哇巴因和乌头碱诱发豚鼠和大鼠心律失常,具有稳定性高、条件可控、重复性好等优点,可用于药物筛选和机制研究.
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