心复康口液对急性力竭大鼠心肌坏死的保护作用

Protective effect of Xinfukang oral liquid on myocardial necrosis in rats following acute exhausted exercise

目的观察急性力竭应激运动后大鼠心肌组织的坏死情况以及心复康口服液的保护作用。方法采用SD雄性大鼠制作急性游泳力竭模型。40只大鼠随机分为4组，每组10只：对照组，低剂量心复康＋急性力竭组，高剂量心复康＋急性力竭组，急性力竭组。其中心复康＋力竭组于每天9∶00～10∶00点用心复康口服液灌胃6周，对照组与急性力竭组灌胃等量生理盐水。造模成功后即刻取材，电镜观察各组心肌组织变化；提取心肌组织总DNA检测基因坏死程度；Western印迹法测定心肌组织细胞外调节蛋白激酶（ERK）及其磷酸化蛋白（p-ERK）的表达情况。结果电镜观察显示急性力竭大鼠心肌组织线粒体肿胀、肌节坏死明显，且其心肌DNA降解明显。与力竭组相比，心复康＋力竭组的心肌组织电镜形态、DNA完整度均有明显改善，p-ERK表达均明显上升（P＜0.05）。结论预服心复康口服液对心肌坏死有一定程度的预防作用。

Objective To observe cardiomyocyte necrosis in the rats induced by acute exhausted exercise and determine the protective effects of Xinfukang oral liquid （a traditional Chinese medicine） on the necrosis. Methods A total of 40 male Sprague-Dawley （SD） rats were randomly divided into 4 groups：control group, the low dose Xinfukang oral liquid [5ml/（kg·d）]＋acute exhaustive group, the high dose Xinfukang oral liquid [10ml/（kg·d）]＋acute exhaustive group, and acute exhaustive group （n=10 for each group）. The Xinfukang oral liquid groups were treated with Xinfukang oral liquid at corresponding doses for 6 weeks by intragastrical administration before model induction, and the rats from the control group and acute exhaustive group were given normal saline instead of Xinfukang oral liquid. Acute exhausted exercise was carried out according to the classical Thomas’ induction, and then identified by the rats’ behaviors and signs. Myocardial necrosis was observed by transmission electron microscopy. DNA ladder were detected to observe myocardial cell DNA degradation. Western blotting was used to analyze the expression of total extracellular signal-regulated kinase （ERK） and phosphorylated ERK （p-ERK） in all groups. Results Transmission electron microscopy indicated that exhausting exercise group showed significantly more serious mitochondria swelling, obvious myocardial necrosis and DNA degradation. Compared with exhausted group, pretreatment of Xinfukang oral liquid resulted in attenuated injury in both myocardial cells and DNA integrity, and a increased ratio of p-ERK expression（P〈0.05）. Conclusion Pretreatment of Xinfukang oral liquid exerts a preventive effect on cardiomyocyte necrosis induced by acute exhaustive exercise.