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磷酯酶A2抑制剂DTNB对大鼠心肌缺血再灌注心律失常的影响

孟繁学 焦晓慧 韩大英

  [摘 要] 目的:研究非钙依赖性的磷脂酶A2 (PLA2)和ATP敏感性钾通道(KATP)在大鼠心肌缺血再灌注(I/R)心律失常中的作用。方法:结扎大鼠左冠状动脉前降支造成缺血10 min,然后放开再灌注10 min。在心肌缺血前5 min分别给予PLA2抑制剂5,5-dithio-bis(2-nitrobenzoic acid)(DTNB)(16 mg/kg),KATP开放剂pinacidil(0.2 mg/kg),KATP阻断剂glibenclamide(0.3 mg/kg)。结果:与对照组相比,DTNB可降低心律失常评分、磷酸肌酸激酶(CPK)和乳酸脱氢酶 (LDH)值(P<0.05);而glibenclamide对I/R心律失常无影响,但升高CPK,LDH值(P<0.05);与glibenclamide组比,在glibenclamide阻断KATP后,DTNB可引起致死性心律失常,并可升高LDH值(P<0.05);pinacidil可完全抑制I/R引起的室颤和室速。结论:PLA2抑制剂DTNB可减轻I/R损伤,表明PLA2在I/R心律失常中起着重要作用,同时也表明激活的KATP具有抗I/R心律失常的作用。但DTNB对抗I/R心律失常的作用与KATP的关系仍有待进一步研究。
  [主题词] 心肌; 局部缺血; 心律失常; 硝基苯甲酸盐; 钙; 磷脂酶A类; 钾通道
  [中图分类号] R 541.7   [文献标识码] A
  [文章编号] 1000-4718(2000)03-0222-04

The effect of phospholipase A2 inhibitor DTNB on the rat ischemia reperfusion arrhythmia

MENG Fan-xue, JIAO Xiao-hui, HAN Da-ying
(Department of Cardiovascular Physiology, Capital University of Medical Sciences, Beijing 100054, China)

  [Abstract] AIM: To determine the effects of phospholipase A2 (PLA2) and KATP on rat ischemia/reperfusion(I/R)-induced arrhythmia. METHODS: Myocardial ischemia and reperfusion were produced by occlusion and reirregation of the left anterior descending artery(LAD). An inhibitor of PLA2, 5,5-dithio-bis(2-nitrobenzoic acid) (DTNB) (16 mg /kg), a KATP opener pinacidil (0.2 mg/kg), a KATP blocker glibenclamide (0.3 mg/kg) was used 5 min prior to 10 min regional ischemia and 10 min reperfusion. RESULTS: DTNB (16 mg/kg) reduced the scores of arrhythmia, creatine kinase (CPK) and lactate dehydrogenase(LDH) (P<0.05). Glibenclamide had no effect on I/R arrhythmia, but increased CPK and LDH (P<0.05). After KATP was blocked by glibenclamide, DTNB led to lethal ventricular fibrillation and increase LDH, higher than without DTNB (P<0.05). Pinacidil depleted ventricular fibrillation and ventricular tachycardia. CONCLUSIONS: PLA2 inhibitor DTNB enhances membrane stability both in structure and funct

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