糖尿病高血脂所致大鼠肾组织SOD和GSH及MDA的变化

目的:通过比较两种糖尿病大鼠模型的代谢特点,研究大鼠肾组织超氧化物歧化酶(superoxide dismutase,SOD),谷胱甘肽(glutathione,GSH),丙二醛(malondialdehyde,MDA)的变化.方法:采用高脂饲料联合小剂量注射链脲佐菌素(streptozotocin,STZ)(模型1组)和多次小剂量注射STZ加福氏完全佐剂(complete Freund's adjuvant,CFA)(模型2组)复制大鼠糖尿病模型,测量大鼠体重、尿量、血糖、血脂、血清胰岛素,计算胰岛素敏感性指数(insulin sensitivity index,ISI),并检测肾组织SOD、GSH、MDA的变化.结果:两组大鼠的体重减轻,尿量增加,血糖明显升高,与正常组比较有显著差异(P＜0.05);模型1组大鼠的肾组织MDA升高,SOD、GSH较模型2组降低更为明显(P＜0.05);模型2组大鼠的血清胰岛素水平下降,模型1组血清胰岛素无明显下降,但ISI较模型2组明显下降(P＜0.05).结论:糖尿病大鼠存在肾脏抗氧化酶的活性下降,而高血脂更易导致糖尿病动物肾组织的氧化损伤.

Changes of SOD,GSH and MDA in renal tissues of diabetic hyperlipidemia rats

OBJECTIVE: To study the changes of SOD, GSH and MDA in the renal tissues of diabetes rat models through the comparison of their metabolic features. METHODS: Two types of diabetes rat models were established by feeding high-lipid food along with small dose injecting of streptozotocin (STZ) (model group 1) and repeated small dose injecting of STZ with complete Freund's adjuvant (CFA) (model group 2). And changes of the following were observed: body weight, urine volume, blood sugar, blood lipid, serum insulin, insulin sensitive index (ISI),superoxide dismutase (SOD), glutathione (GSH) and malondialdehyde (MDA) of the renal tissues. RESULTS: The body weight of the two model groups of rats decreased, while the urine volume and the blood sugar increased predominantly. These indexes of the two model groups were significantly different from those of the normal group (P<0.05). The renal tissue MDA level increased while the SOD and GSH level decreased in both model group 1 and model group 2, but the changes in model group 1 were more obvious than those in the model group 2. The serum insulin level which decreased in model group 2 did not decrease significantly in model group 1, but the ISI in model group 1 decreased more significantly than that in model group 2 (P<0.05). CONCLUSION: The antioxidase activity decreased in renal tissues of diabetes rats and hyperlipidemia was the main cause of the corresponding oxidations.