Abstract:

Objective: To study the improvement effect of Sophora Flavones combined with captopril on the rat diabetic cardiomyopathy,and to clarify its mechanisms of improving the myocardial fibrosis. Methods: Fifteen rats were selected randomly from 100 male Wistar rats as normal group.The other rats were fed with high fat and high sugar food and intraperitoneally injected with small dose of streptozotocin (30 mg·kg^-1) all at once to establish type 2 diabetes mellitus cardiomgopathy models.Then 72 rat models with type 2 diabetic cardiomyopathy were set up in which 60 rats were selected according to the blood glucose levels and divided into model group,captopril group,Sophora Flavones group, and Sophora Flavones combined with captopril group (combination group)(n=15).8 weeks after intragastric administration,the weights,the cardiac indexes,the activities of serum creatine kinase-MB(CK-MB),lactate dehydrogenase(LDH),and the contents of nitric oxide(NO),nitric oxide synthase(iNOS),collagen Ⅰ(Col Ⅰ) and collagen Ⅲ(Col Ⅲ) of the rats in various groups were detected. Results: Compared with normal group,the weight of the rats in model group was decreased and the cardiac index was increased(P < 0.01), the activities of serum LDH and CK-MB were increased(P < 0.01),the contents of iNOS and NO in the myocardium tissue of the rats in model group were decreased(P < 0.01),and the contents of Col Ⅰ and col Ⅲ were increased(P < 0.05 or P < 0.01).Compared with model group,the weights and the cardiac indexes of the rats in medication groups were decreased(P < 0.05), the activities of serum LDH and CK-MB were decreased(P < 0.05 or P < 0.01), the contents of iNOS and NO in the myocardium tissue were increased(P < 0.05),and the contents of Col Ⅰ and Col Ⅲ were decreased(P < 0.05 or P < 0.01).The effect of combination group was better than single medication groups(P < 0.05). Conclusion: Combination of Sophora Flavones and captopril has a improvement effect on the rat type 2 diabetic cardiomyopathy,and its mechanism may be related to reducing the myocardial injury to improve diabetic cardiomyopathy

Key words: diabeticmellitus,type 2, cardiomyopathy, Sophora Flavones, captopril