OBJECTIVE:To study the preventive effect and mechanism of butylphthalide on myocardial ischemia-reperfusion injury in rats. METHODS:SD rats were randomly divided into sham operation group,model group,butylphthalide low-dose,me-dium-dose,high-dose groups (50,75,100 mg/lg),10 in each group. All rats were intragastrically administrated related drugs once a day,sham operation group and model group were intragastrically administrated equal amount of normal saline,for 3 d. Af-ter last administration,except for sham operation group,120 min of repertusion was conducted. Ratio of myocardial infarction ar-ea, apoptosis rate of myocardial cells, expressions of apoptosis-related protein [proapoptotic proteins (Caspase-3, Fas, Cas-pase-9),apoptotic protein (Bcl-2)],left ventricular ejection fraction (LVEF),and content of vascular endothelial growth factor (VEGF)in serum of rats in other groups were detected. RESULTS:Compared with sham operation group,myocardial infarction ar-ea and apoptosis rate of myocardial cells in model group were obviously increased;expressions of Caspase-3,Fas,Caspase-9 pro-tein in myocardial cells were obviously enhanced,Bcl-2 protein expression was obviously weakened;LVEF and serum VEGF con-tent were obviously reduced (P0.05),above indexes in other administration groups improved obviously (P0.05)外,其余各给药组大鼠的上述指标均明显改善(P<0.05).与丁苯酞低剂量组比较,丁苯酞高剂量组大鼠的心肌梗死面积、细胞凋亡率均明显降低(P<0.05);丁苯酞中、高剂量组大鼠心肌细胞中Caspase-3、Fas、Caspase-9蛋白表达明显减弱,Bcl-2蛋白表达明显增强(P<0.05).结论:丁苯酞可有效减轻大鼠心肌缺血再灌注损伤,保护心功能,其机制可能与上调VEGF有关.
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