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期 刊 ：中国中药杂志 2008年 33卷 15期 页码：1894.

关键词：S-亚硝基化；参麦方；心肌缺血再灌注损伤；

Keywords:S-nitrosylation, myocardial ischemia/reperfusion injury (MI/RI), Radix Ginseng and Radix Ophiopogonis extract (SMF),

摘 要 ：目的：观察参麦方对急性心肌缺血的保护作用及其对心肌蛋白S-亚硝基化的影响。方法：SD大鼠分为给药组与模型组，给药组灌胃参麦方(3 g·kg^-1)5 d后，结扎冠状动脉左前降支造成心肌缺血再灌注损伤(myocardial ischemia/reperfusion injury, MI/RI）；测定血清肌酸激酶(CK) 、乳酸脱氢酶(LDH)含量，以评价心肌损伤程度；Griess法测定血清一氧化氮(NO)含量，Western blot法检测心肌组织内皮型一氧化氮合酶(eNOS)表达变化；分别采用Biotin Switch法和DAN荧光法对心肌蛋白S-亚硝基化水平进行检测。结果：与模型组比较，参麦方给药组血清CK,LDH活性明显下降(P<0.05)，表明参麦方具有良好的抗心肌缺血效果。此外，血清NO含量显著升高且心肌组织eNOS表达上调(P<0.01)。相对分子质量90～117×10³的心肌蛋白发生明显的S-亚硝基化，其S-亚硝基化水平由(4.42±0.60) μmol·g^-1上升至(8.78±1.37) μmol·g^-1(P<0.01)。结论：促进缺血心肌组织蛋白的S-亚硝基修饰可能是参麦方抗心肌缺血再灌注损伤的主要作用途径之一。

Abstract:Objective: To observe the effect of Radix Ginseng and Radix Ophiopogonis extract (SMF) on protein S-nitrosylation in rats myocardial with ischemia/reperfusion injury (MI/RI). Method: Myocardial ischemia/ reperfusion in rats were produced by occlusion of the left anterior descending coronary artery. To study the cardioprotective effects of SMF on the acute MI/RI rats, the serum levels of creatine kinase (CK), lactate dehydrogenase (LDH), and nitric oxide (NO) were determined. The change of the expression of endothelial nitric oxide synthase (eNOS) was detected by Western blot. The content of related S-nitrosylation proteins in myocardial tissue was measured by Biotin-Switch method. Result: SMF significantly decreased the serum levels of CK and LDH as well as increased the serum levels of NO and the expression of eNOS in myocardial tissue. The contents of S-nitrosylation proteins were significantly increased from (4.42±0.60) μmol·g^-1 to (8.78±1.37) μmol·g^-1. The molecular weight of the majority S-nitrosylation proteins were in the range of 90×10³-117×10³. Conclusion: Increased expression of eNOS and NO induced by SMF may activate S-nitrosylation of many proteins in rat hearts. The change of the activities or functions of those proteins by S-nitrosylation may be an important mechanism for myocardial protective effects of SMF.

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