冠心康胶囊对实验性急性心肌缺血大鼠心肌损伤的保护作用及机制

目的探讨冠心康胶囊对实验性急性心肌缺血大鼠心肌损伤的保护作用及机制。方法30只♂Wistar大鼠随机分为正常对照组、心肌损伤模型组和冠心康胶囊治疗组,每组10只。采用皮下注射异丙肾上腺素(isoproterenol,ISO)诱导大鼠急性心肌缺血损伤模型。监测各组大鼠心电、磷酸肌酸激酶(creatine kinase,CK)、磷酸肌酸激酶同功酶(creatine kinase MBmass,CK-MB)、乳酸脱氢酶(lactate dehydrogenase,LDH)变化,同时观察血清和心肌组织匀浆中一氧化氮(ni-tricoxide,NO)和内皮素(endothelins,ET)水平的改变。结果冠心康胶囊治疗组可明显改善心肌缺血大鼠心电图ST-T段的改变:治疗组的CK、CK-MB、LDH水平均较损伤组明显降低(P<0.01);治疗组的血清和心肌组织匀浆中NO明显升高(P<0.05),而心肌组织匀浆中ET含量明显降低(P<0.05)。结论冠心康胶囊能明显减轻急性心肌缺血大鼠的心肌损害,NO和ET的变化可能是其防治心肌损伤的重要机制之一。

Protective effects and mechanism of Guanxinkang capsules on myocardial injury induced by isoproterenol in rats

Aim To study the effects and mechanism of Guanxinkang capsules on myocardial injury induced by isoproterenol in rats.Methods 30 male Wistar rats were randomly divided into 3 groups:control group,acute myocardial ischemia group and Guanxinkang capsules group.Rats were given injections of ISO subcutaneously.Electrocardiography were performed,serum and myocardium creatine kinase(CK),creatine kinase MBmass(CK-MB),lactate dehydrogenase(LDH) and nitric oxide(NO) were detected,and the levels of NO and endothelins(ET) in myocardium were measured as well.Results The rising degree of ST-T obviously decreased in Guanxinkang capsules group,and the levels of serum CK,CK-MB and LDH decreased in Guanxinkang capsules group,compared with those of acute myocardial ischemia group(P<0.01);In Guanxinkang capsules group,the NO levels in serum and myocardium increased significantly(P<0.05),while the ET level in myocardium markedly decreased,compared with that of acute myocardial ischemia group(P<0.05).Conclusion Guanxinkang capsules could effectively ameliorate the myocardium injury induced by acute myocardial ischemia.Changes of NO and ET levels might play an important role in the pathogenesis and progress of myocardium injury.