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.