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中国临床药理学与治疗学 ›› 2004, Vol. 9 ›› Issue (5): 490-493.

• 研究原著 • 上一篇    下一篇

二氮嗪对大鼠心肌线粒体膜电位及呼吸功能的影响

曾源1,2, 龙超良1, 慕邵峰1, 李艳芳2, 汪海1   

  1. 1军事医学科学院毒物药物研究所, 北京100850;
    2解放军总医院南楼心肾科, 北京100853
  • 收稿日期:2004-02-11 修回日期:2004-03-16 发布日期:2020-11-22
  • 通讯作者: 汪海,男, 医学博士, 研究员, 博士生导师, 从事心血管药理和新药研究工作。Tel:010-66932651 E-mai l:wh @nic.bmi.ac.cn
  • 作者简介:曾源, 女, 主治医师, 老年心血管病学硕士生。Tel:010-66931557
  • 基金资助:
    军队医药卫生“ 十五” 重点课题(No01Z025)

Effects of diazoxide on membrane potential and respiration function of rat cardiac mitochondria

ZENG Yuan1,2, LONG Chao-Liang1, MU Shao-Feng1, LI Yan-Fang2, WANG Hai1   

  1. 1Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing 100850, China;
    2Department of Cardiology and Nephrology, PLA General Hospital, Beijing 100853, China
  • Received:2004-02-11 Revised:2004-03-16 Published:2020-11-22

摘要: 目的 研究二氮嗪对大鼠心肌线粒体功能的影响, 以探讨其心肌保护作用的可能机理。 方法 以罗丹明123 为荧光探针测定线粒体膜电位, 氧电极法测线粒体呼吸, 观察二氮嗪对正常大鼠心肌线粒体跨膜电位及呼吸的影响。 结果 50 μmol·L-1 的二氮嗪可引起线粒体膜电位去极化, 此影响可被钾通道阻滞剂消除;二氮嗪100 μmol·L-1可降低大鼠心肌线粒体琥珀酸链的R3、R4 速率, 但不影响呼吸控制率。 结论 二氮嗪可调节大鼠心肌线粒体功能, 这与其抗心肌缺血保护作用有关。

关键词: 二氮嗪, 线粒体, 氧电极法, 线粒体膜电位

Abstract: AIM: To study the effects of selective mitoKATP opener diazoxide on the isolated mitochondria from rat hearts and to discuss its cardioprotective mechanism. METHODS: Using Rhodamine123 (Rh123)as fluorescent prober to measure mitochondrial membrane potential and to record mitochondrial respiratory parameters with a Clark electrode, the effect of diazoxide on mitochondrial membrane potential and mitochondrial respiration were investigated. RESULTS: 50 μmol·L-1 diazoxide could induce mitochondrial membrane depolarization and this effect was abolished by application of a KATP channel blocker.It could decrease R3 and R4 while oxidizing FAD-dependent substrates (succinate)but did not affect respiratory control ratio (RCR). CONCLUSION: Modulation by diazoxide on functions of rat cardiac mitochondria is associated with its anti-ischemic efficacy.

Key words: diazoxide, mitochondria, Clark electrode, mitochondrial membrane potential

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