马里苷减轻糖尿病小鼠心肌纤维化

Marein alleviates myocardial fibrosis in diabetic mice

目的研究马里苷(marein)对糖尿病小鼠心肌纤维化的影响。方法选取5~6周龄10只瘦素受体基因缺陷杂合(db/m)雄性小鼠为对照组和30只对糖尿病瘦素受体基因缺陷db/db雄性小鼠,db/db雄性小鼠分为:db/db组(db/db,n=10)、二甲双胍(Met)阳性药组(每日灌胃280 mg/kg,n=10)和马里苷药物干预组(每日灌胃50 mg/kg,n=10)。持续给药8周后,HE染色、Masson染色观察心脏形态学改变;免疫组织化学检测波形蛋白(vimentin)的分布及表达;蛋白免疫印迹法(Western blot)检测心肌组织fibronectin、vimentin、转化生长因子-β1(TGF-β1)蛋白的表达。结果db/db组心肌纤维肥大,二甲双胍组和马里苷组心肌结构损伤有所改善。db/db组小鼠心肌组织胶原纤维表达较db/m组增多(P<0.01),二甲双胍组和马里苷组心肌组织胶原纤维的表达较db/db组下降(P<0.01)。db/db组相比于对照组心肌组织vimentin的表达明显升高(P<0.01),二甲双胍组和马里苷组vimentin的表达较db/db组明显降低(P<0.01)。db/db组fibronectin、vimentin、TGF-β1的表达较db/m组明显升高(P<0.01),二甲双胍组和马里苷组fibronectin、vimentin、TGF-β1表达明显下降(P<0.01)。结论马里苷能够改善糖尿病db/db小鼠心肌组织的纤维化。

Objective To study the effect of marein on myocardial fibrosis in diabetic mice.Methods Ten leptin receptor gene defective heterozygous(db/m)mice aged 5-6 weeks were selected as the control group and 30 diabetic mice with leptin receptor gene defective db/db were divided into:db/db group(db/db,n=10),metformin(Met)positive group(280 mg/kg daily,n=10)and marein drug intervention group(50 mg/kg,n=10).After continuous administration for 8 weeks,the cardiac morphological changes were observed by HE staining and Masson staining.The distribution and expression of vimentin were detected by immunohistochemistry method.The expression of fibronectin,vimentin,and transforming growth factor-β1(TGF-β1)protein in cardiac tissue was detected by Western blot.Results Myocardial fiber hypertrophy was observed in db/db group,and myocardial structural damage was improved in metformin group and marein group.Compared with db/m group,the expression of myocardial collagen fiber in db/db group increased(P<0.01),while the expression of myocardial collagen fiber in metformin group and marein group decreased(P<0.01).Compared with the control group,the expression of vimentin in myocardial tissue of db/db group was significantly increased(P<0.01),while the expression of vimentin in metformin group and marein group was significantly decreased(P<0.01).The expression of fibronectin,vimentin and TGF-β1 in db/db group was significantly increased as compared with those in db/m group(P<0.01),while the expression of fibronectin,vimentin and TGF-β1 in metformin group and marein group were significantly decreased(P<0.01).Conclusions Marein improves myocardial fibrosis in diabetic db/db mice.