葛根素对糖尿病大鼠肾脏蛋白激酶C活性的作用

目的 研究葛根素(Pue)对糖尿病大鼠。肾脏蛋白激酶C(PKC)活性、肾功能及肾脏结构的影响。方法 链脲佐菌素(STZ)诱导糖尿病大鼠模型，随机分为糖尿病组、Pue(500、250、125mg／kg)治疗组、维生素E(VitE)组，同时另设正常对照组，给药12周后，测定肾功能及。肾脏指数，ELISA法测定肾脏PKC活性，放免法测定尿蛋白排泄率，并对肾组织进行光镜及电镜观察。结果 糖尿病大鼠尿白蛋白排泄率、肾脏指数(肾脏质量／体重)、肾小球细胞膜PKC活性明显升高，给予Pue治疗12周后，治疗组糖尿病大鼠尿白蛋白排泄率较糖尿病组显著降低，肾脏肥大也有明显改善，肾小球细胞膜PKC：活性显著下降，光镜及电镜下肾脏病理改变较糖尿病组有较大改善。结论 Pue可以纠正糖尿病大鼠早期肾脏高滤过、高灌注，并对糖尿病大鼠肾脏病变有一定的保护作用，其部分机制可能是通过下调。肾脏PKC活性而实现的。

Effects of puerarin on renal protein kinase C activity in diabetic rats

Object To investigate the effect of puerarin (Pue) on renal protein kinase C (PKC) activity, kidney structure and function in diabetic rats. Methods STZ-induced diabetic rats were randomly divided into five groups: Diabetic rats model group (DM), Pue (500, 250, 125 mg/kg) treatment group, and VitE group, in addition, normal rats for control group. All rats were given by ig for 12 weeks. Kidney function and kidney index were determined; The PKC activity was measured by ELISA. The excretion of microalbuminuria (MAU) was measured by radio-immunoassay, and kidney tissue was observed by light-microscope and transmission electron microscope. Results The excretion of MAU, kidney index (kidney weight/body weight) and PKC activity in diabetic rats were significantly increased. The excretion of MAU, and PKC activity were markedly decreased in Pue treatment group, and kidney pathologic changes of diabetic rats in Pue treatment group were improved. Conclusion Pue can ameliorate early kidney hy-perdynamic abnormality in diabetic rats, possess protective effect on kidney of diabetic rats, whose mechanism may be associated partly with a down-regulation of PKC activity.