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2[对-(二甲氨基)苯乙烯]碘化甲基砒啶对豚鼠乳头肌慢反应动作电位和慢内向离子流的影响

毛新民, 李迪民, 周承明, 王晓雯, 张克锦   

  1. 新疆医学院药理教研室, 乌鲁木齐 830054
  • 收稿日期:1993-04-02 修回日期:1993-07-03 出版日期:1995-03-15 发布日期:1995-03-15

Effects of 2-[p-(Dimethylamino)Styrl] PyridineMethiodide on Slow Response Action Potentialand Slow lnward Current of Guinea Pig Papillary Muscles

Xin-Min Mao, Di-Min Li, Cheng-Ming Zhou, Xiao-Wen Wang, Ke-Jing Zhang   

  1. Department of pharmacology Xinjiang Medical Colleg; Wulumuqi 830054
  • Received:1993-04-02 Revised:1993-07-03 Online:1995-03-15 Published:1995-03-15

摘要: 用细胞内微电级和电压钳技术研究了2[-(二甲氨基)苯乙烯]碘化甲基砒啶(DSPM)对豚鼠乳头肌慢反应动作电位(SRAP)和慢内向电流(Isi) 的影响。用DSPM液灌流50分钟后, K+所致SRAP的振幅和零相最大上升速率均显著降低, Isi 的峰值由8.8±1.6 μA降至5.7±1.8 μA。上述结果表明DSPM具有选择性阻断钙通道的作用。

关键词: 2[对-(二甲氨基)苯乙烯]碘化甲基砒啶, 维拉帕米, 氯化钙, 乳头状肌, 钙通道, 电压钳, 动作电位

Abstract: The effects of 2-[p-(Dimethylamino)styryl] pyridine methiodide (DSPM) on slow response action potential (SRAP) and slow inward current (Isi) of guinea pig papillary muscles were studied by intracellular microelectrodes and voltage clamp techniques. The APA and Vmax of SRAP induced by high K+ were decreased after 50 min of perfusion with DSPM solution. Isi was suppressed from a peak value of 8.8±1.6 μA to 5.7±1.8 μA, The results indicated that DSPM has a selective blocking effect on calcium channel.

Key words: p-(Dimethylamino)styryl] pyridine methiodide(DSPM), Verapamil, Calcium chloride, Papillary muscle, Calcium channel, Voltage clamp, Action potential

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