酸味中药复方对实验性2型糖尿病大鼠胰岛素抵抗的影响

目的根据中医学五行五味“酸克甘”理论,观察酸味中药复方对实验性2型糖尿病大鼠血糖及其胰岛素抵抗的影响。方法采用高热量饲料持续喂养8周联合腹腔注射小剂量链脲佐菌素的方法,建立2型糖尿病大鼠模型,用酸味中药复方按中药生药量15g·kg^-1·d^-1给药,并与模型组、甘味复方组、苦味复方组、二甲双胍组作对照,分别在给药前和给药第4、8、12周后,测定空腹血糖(fasting blood glucose,FBG)、血清胰岛素、游离脂肪酸(free fatty acids,FFA)、肿瘤坏死因子α(tumor necrosis factora,TNF—α)、肝脏胰岛素受体结合容量和结合常数,计算胰岛素敏感性指数。结果酸味中药复方能显著降低实验性2型糖尿病大鼠FBG,降低血清FFA和TNF—α水平,刺激胰岛素分泌,提高肝脏胰岛素受体结合容量和结合常数,改善胰岛素敏感性,与模型组比较差异有显著性(P<0．05)。结论酸味中药复方能够改善2型糖尿病模型大鼠的糖代谢紊乱和胰岛素抵抗程度,较之甘味复方和苦味复方有一定的治疗优势,初步揭示酸克甘法治疗2型糖尿病理论具有一定的科学性和临床指导价值。

Effect of Sour TCM Compound Recipe on Insulin Resistance in Experimental Rats with Diabetes Mellitus Type 2

OBJECTIVE: To study the effect of sour TCM compound Recipe (SCCR) on insulin resistance in experimental rats with diabetes mellitus type 2 (DM2), under the guidance of TCM doctrine of "sour restrains sweet". METHODS: Model rats of DM2 were established by 8 weeks' feeding with high calorie forage combined with intraperitoneal injection of small dose of streptozotocin, and treated with SCCR (15 g/kg of crude drug/day). Levels of fasting blood glucose (FBG), serum insulin, free fatty acids (FFA), tumor necrosis factor a (TNF-alpha), combining capacity and constant of insulin receptor in liver were determined before treatment and 4, 8 and 12 weeks after treatment, and the insulin sensitive index was calculated. The data were compared with those in the model group (untreated), sweet TCM compound recipe group and bitter TCM compound group (treated with sweet and bitter Chinese drugs respectively) and the control group (treated with dimethyldiguanide). RESULTS: SCCR could markedly reduce the FBG, serum FFA and TNF-alpha levels in rat model of DM2, stimulate the secretion of insulin, raise the combining capacity and constant of insulin receptor in liver and improve the insulin sensitivity, as compared with the effect of sweet or bitter Chinese compound recipe, the difference was significant (P < 0.05). CONCLUSION: SCCR could improve the glucose metabolic disorder and ameliorate the degree of insulin resistance in DM2 model rats, with the effect superior to those with sweet or bitter taste, which illustrates primarily that the therapeutic principle of "sour restrains sweet" of TCM is true of science in a certain degree and having its guiding significance in clinical practice.