灯盏乙素对小鼠糖尿病心肌病的保护作用研究

Protective effects of scutellarin on diabetic cardiomyopathy in mice

探讨灯盏乙素对小鼠糖尿病心肌病的改善作用。采用高脂饲料喂养,并一次性腹腔注射50 mg?kg-1链脲佐菌素(streptozotocin, STZ)制备小鼠2型糖尿病模型,灯盏乙素腹腔注射给药, 8周后进行空腹血糖测定、血清中相关生化指标检测,并对心肌组织进行Masson染色。通过Western blot观察小鼠心肌组织中Nrf2、NFκB、AKT、p-AKT表达水平。实验过程均符合北京协和医学院动物保护委员会的相关规定。结果显示,灯盏乙素显著降低糖尿病小鼠心体比,提高心肌收缩功能,明显降低小鼠心肌纤维化水平及心肌组织collagenⅠ和collagenⅢ的表达。灯盏乙素有效降低糖尿病小鼠血清中乳酸脱氢酶(LDH)、肌酸激酶同工酶(CK-MB)、丙二醛(MDA)水平,升高血清中抗氧化酶水平,并抑制炎性因子的释放。进一步研究发现,灯盏乙素显著升高Nrf2核转位,抑制NFκB核转位,提高AKT磷酸化水平。以上结果表明,灯盏乙素对小鼠糖尿病心肌病具有显著改善作用。

To investigate the effect of scutellarin(Scu) on diabetic cardiomyopathy in mice, type 2 diabetes mellitus was induced by intraperitoneal injection of 50 mg?kg-1streptozotocin(STZ) into a high-fat diet. Scu was injected intraperitoneally. After 8 weeks, fasting blood glucose and serum biochemical parameters were measured.Masson staining was performed on myocardial tissue. The expression levels of Nrf2, NFκB, AKT and p-AKT in myocardium of mice were observed by Western blot. All the procedures were approved by the Laboratory Animal Ethics Committee of the Peking Union Medical College. The results showed that Scu significantly decreased the heart-body ratio, increased myocardial contractile function, decreased the level of myocardial fibrosis and the expression of collagen I and collagen III in myocardium of diabetic mice. Scu can effectively reduce the levels of lactate dehydrogenase(LDH), creatine kinase isoenzyme(CK-MB), malondialdehyde(MDA) in serum of diabetic mice, increase the level of antioxidant enzymes in serum, and inhibit the release of inflammatory factors. Further studies showed that Scu significantly increased Nrf2 nuclear translocation, inhibited NFκB nuclear translocation and increased AKT phosphorylation. It indicates that Scu has significant effect on diabetic cardiomyopathy in mice.