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• 基础研究 • 上一篇    下一篇

氧化苦参碱对缺血再灌注致心律失常的影响及其机制

韩丹丹1,张文杰2,刘洁3,陈燕萍4,马兴元4,陈霞1    

  1. (1.吉林大学基础医学院药理学教研室,吉林 长春 130021;2.吉林大学基础医学院生理学教研室,吉林 长春 130021;3.吉林大学基础医学院机能科学实验中心,吉林 长春 130021;4.吉林大学化学学院,吉林 长春 130012
  • 收稿日期:2007-04-20 修回日期:1900-01-01 出版日期:2007-11-28 发布日期:2007-11-28
  • 通讯作者: 陈霞

Effects of oxymatrine on arrhythmia induced by ischemia-reperfusion and mechanisms

HAN Dan-dan1,ZHANG Wen-jie2,LIU Jie3,CHEN Yan-ping4,MA Xing-yuan4,CHEN Xia1   

  1. (1.Department of Pharmacoclogy,School of Basic Medical Sciences ,Jilin University,Changchun 130021,China; 2.Department of Phsiology,School of Basic Medical Sciences,Jilin University,Changchun 130021,China;3. Experimental Center of Functional Sciences,School of Basic Medical Sciences, Jilin University,Changchun 130021,China; 4. School of Chemistry,Jilin University,Changchun 130012,China)
  • Received:2007-04-20 Revised:1900-01-01 Online:2007-11-28 Published:2007-11-28
  • Contact: CHEN Xia

摘要: 目的:观察氧化苦参碱(OMT)对大鼠缺血再灌注所致心律失常的影响,并初步探讨其作用机制。方法:结扎大鼠左冠状动脉前降支5 min后再灌注10 min制备缺血再灌注性心律失常模型,分为模型组及OMT 15、30和60 mg•kg-1组,观察再灌注后10 min内大鼠室性早搏(VP)出现时间、室性心动过速(VT)持续时间及所有类型心律失常的持续时间。将家兔离体心室乳头肌分为对照组、不同浓度OMT组及OMT+TEA(K+通道阻断剂)组,观察其动作电位的变化。结果:与模型组比较,OMT 15、30和60 mg•kg-1组VP出现时间延迟、VT持续时间缩短(P<0.05,P<0.01),OMT 30和60 mg•kg-1组心律失常持续时间缩短(P<0.01),并且呈明显的剂量依赖性;与对照组比较,OMT 0.1、1.0和10.0 mmol•L-1组家兔离体心室乳头肌动作电位幅值(APA)减小,动作电位10%、50%及90%复极化时程(APD10、APD50及APD90)明显缩短(P<0.05,P<0.01),且TEA可减弱其作用。结论:OMT可对抗缺血再灌注所致大鼠的心律失常,其机制可能与缩短动作电位时程有关。

关键词: 缺血再灌注 , 心律失常 , 动作电位, 离体乳头肌

Abstract: To observe the effects of oxymatrine(OMT) on arrhythmia induced by ischemia-reperfusion and explore its mechanism. MethodsThe left arterial descending coronary artery(LAD) was ligated for 5 min followed by 10 min reperfusion in order to induce ischemia-reperfusion arrhythmia in rats.Rats were randomly divided into: model group,OMT groups with different doses (15,30,and 60 mg•kg-1).The emergency time of ventricular premature(VP),and the duration of ventricular tachycardia(VT) and arrhythmia induced by ischemia-reperfusion were observed.The isolated rabbit papillary muscles were divided into control group,OMT groups with different doses and OMT+TEA group.The action potientials in various groups were observed. ResultsCompared with model group,OMT delayed the emergency time and decreased the duration of arrhythmia induced by ischemia-reperfusion in dose-dependent manner in rats(P<0.05,P<0.01).Compared with control group, the 10%,50% and 90% repolarization levels were shortened by OMT in isolated rabbit papillary muscles(P<0.05,P<0.01).The effects were blocked by TEA. Conclusion OMT may antagonize the arrhythmia induced by ischemia-reperfusion in rats,its mechanism may 〖JP3〗be related with shortening action potential duration (APD).

Key words: ischemia-reperfusion, arrhythmia, action potential , papillary muscle

中图分类号: 

  • R285.5