化学学报 ›› 2002, Vol. 60 ›› Issue (1): 169-170. 上一篇    下一篇

研究论文

镧对心肌细胞钾通道的作用研究

薛绍武;杨频;杜会枝   

  1. 山西大学分子科学研究所
  • 发布日期:2002-01-15

Determination of lanthanum effect on myocardiac potassium channels

XUE SHAOWU;YANG PIN;DU HUIZHI   

  • Published:2002-01-15

用全细胞膜片钳记录方式研究了La^3^+对大鼠心室肌细胞钾通道的作用机理。对酶解分离的大鼠心室肌细胞施一跃迁电压可引出一非钙依赖性电压去激活的外向钾电流。将10μmol/LLa^3^+加入细胞外液后,非钙依赖性电压去激活的外向钾电流明显减小,这提示在大鼠心室肌细胞钾通道上存在La^3^+结合位点。

关键词: 镧离子, 分子科学, 心肌细胞, 钾通道, 毒理学, 稀土元素

Whole-cell patch-clamp recording mode was used to study the action mechanism of La^3^+ on rat ventricular myocytes potassium channels. The Ca^2^+-independent voltage-activated outward K^+ current was activated by the depolarizing pulse in enzymatically isolated rat ventricular myocytes. When 10 μmol/L La^3^+ was added to the bath solution, the Ca^2^+-independent voltage-activated outward K^+ current was distinctly suppressed. It implies that there may exist one or more binding-sites in potassium channels for La^3^+.

Key words: LANTHANUM ION, MOLECULAR SCIENCE, TOXICOLOGY, RARE ELEMENT

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