醋柳黄酮对大鼠心肌缺血/再灌注损伤的保护作用

目的观察醋柳黄酮作用于大鼠心肌缺血/再灌注损伤前后心肌形态学改变及组织MMP-9及其抑制物TIMP-1表达的改变,探讨醋柳黄酮对心肌缺血/再灌注损伤的保护机制。方法将50只大鼠随机分组:模型组、氯沙坦组、醋柳黄酮大、小剂量组及假手术组。结扎左冠状动脉前降支,30 min后松开制作心肌缺血/再灌注模型。对心肌组织进行HE染色,观察心肌坏死组织病理变化;免疫组织化学检测再灌注心肌组织MMP-9及其抑制物TIMP-1表达。结果 HE染色观察醋柳黄酮大、小剂量组预处理的大鼠心肌坏死较模型组明显减轻;免疫组化结果示模型组较假手术组MMP-9、TIMP-1表达增高(P<0.05);醋柳黄酮大、小剂量组较模型组MMP-9表达减少,TIMP-1表达增多,MMP-9/TIMP-1比值减小(P<0.05)。结论醋柳黄酮对再灌注损伤心肌有保护作用,其作用机制与抑制心肌中MMP-9表达,促进TIMP-1表达有关。

Protective effects of sindacon on myocardial ischemic reperfusion injury in rats

Aim To observe the effects of total flavones of hippophae rhamnoides L on myocardial ischemia-reperfusion injury and the MMP-9 and TIMP-1 expression in cardiac tissues of rats,and to explore the protective mechanism of total flavones of hippophae rhamnoides L on myocardial ischemia-reperfusion injury.Methods Fifty rats were classified into 4 groups by using the random grouping principle:model group,losartan group,sindacon group of different doses and sham operation group.The myocardial ischemia-reperfusion injury model was established by ligating left anterior descending coronary artery for 30 minutes and releasing then.The cardiac muscle tissue was stained by HE to observe its necrosis area and pathological changes as well as the expression of MMP-9 and TIMP-1by immunohistochemistry method.Results HE sections showed that necrosis of cardiac muscle in rats was significantly relieved in sindacon group by using different doses compared with model group,and immunohistochemistry sections showed that the sindacon group using different doses decreased the expression of MMP-9 compared with the model group and increased the expression of TIMP-1.Conclusion Sindacon has protective effect on cardiac muscle after the myocardial ischemia-reperfusion injury,and its mechanism may be related to its inhibition of the MMP-9 and increasing TMPM-1 expression in cardiac muscle.