首页> 外文期刊>American Journal of Physiology >KATP channels are common mediators of ischemic and calcium preconditioning in rabbits.
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KATP channels are common mediators of ischemic and calcium preconditioning in rabbits.

机译:KATP通道是兔缺血和钙预处理的常见介体。

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摘要

Calcium preconditioning (CPC), like ischemic preconditioning (IPC), reduces myocardial infarct size in dogs and rats. ATP-sensitive potassium (KATP) channels induce cardioprotection of IPC in these animals. To determine whether KATP channels mediate both IPC and CPC, pentobarbital sodium-anesthetized rabbits received 30 min of coronary artery occlusion followed by 180 min of reperfusion. IPC was elicited by 5 min of occlusion and 10 min of reperfusion, and CPC was elicited by two cycles of 5 min of calcium infusion with an interval period of 15 min. Infarct size expressed as a percentage of the area at risk was 38 +/- 3% (mean +/- SE) in controls. IPC, CPC, and pretreatment with a KATP channel opener, cromakalim, all reduced infarct size to 13 +/- 2, 17 +/- 2, and 12 +/- 3%, respectively (P < 0.01 vs. controls). Glibenclamide, a KATP channel blocker administered 45 min (but not 20 min) before sustained ischemia, attenuated the effects of IPC and CPC (31 +/- 4 and 41 +/- 6%, respectively). Thus KATP channel activation appears to contribute to these two types of cardioprotection in rabbits.
机译:像缺血预处理(IPC)一样,钙预处理(CPC)可以减少狗和大鼠的心肌梗塞面积。 ATP敏感性钾(KATP)通道在这些动物中诱导IPC的心脏保护。为了确定KATP通道是否介导IPC和CPC,戊巴比妥钠麻醉的兔子接受30分钟的冠状动脉闭塞,然后再灌注180分钟。通过闭塞5分钟和再灌注10分钟来引发IPC,通过两次钙注射5分钟(间隔15分钟)来引发CPC。在对照中,梗塞面积以风险区域的百分比表示为38 +/- 3%(平均+/- SE)。 IPC,CPC和使用KATP通道开放剂cromakalim的预处理均将梗塞面积分别减少至13 +/- 2、17 +/- 2和12 +/- 3%(与对照组相比,P <0.01)。格列本脲是持续缺血前45分钟(而非20分钟)给药的KATP通道阻滞剂,可减弱IPC和CPC的作用(分别为31 +/- 4和41 +/- 6%)。因此,KATP通道的激活似乎有助于兔子的这两种类型的心脏保护。

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