普伐他汀对糖尿病大鼠肾脏氧化应激的抑制作用

目的:探讨普伐他汀(pravastatin)对糖尿病大鼠肾脏氧化应激反应的影响及其机制.方法:将SD 大鼠随机分为正常对照组(CN)、糖尿病对照组(DM)、普伐他汀治疗组(DM P)、褪黑素治疗组(DM M),每组7只.使用链脲佐菌素(STZ)诱导制备糖尿病大鼠模型.治疗组分别予普伐他汀和对照药物褪黑素(Mel)治疗,8周后检测大鼠血及肾组织中各项生化指标及各项抗氧化指标.结果:成功建立大鼠糖尿病模型.与DM组比较,Mel治疗可使24 h尿蛋白量显著降低(P<0.05),DM P组尿蛋白排泄量降低更为明显(P<0.01); 与DM组比较,DM P组肾重/体质量比值有所下降(P<0.05).与DM、DM M相比,普伐他汀处理对糖尿病大鼠血浆MDA含量、红细胞SOD活性变化无明显影响,但可使全血谷胱甘肽过氧化物酶(GSH-Px)活性在8周时明显升高(P<0.01).普伐他汀和Mel处理均可使糖尿病大鼠肾脏SOD活性、GSH-Px活性明显升高(P<0.05),普伐他汀还可使肾脏MDA含量显著下降(P<0.01).结论:普伐他汀能明显改善糖尿病大鼠的肾功能,这可能与其抑制糖尿病大鼠肾脏氧化应激反应有关.

Inhibitory effects of pravastatin on oxidative stress in kidney of diabetic rats

Objective:To investigate the effect of pravastatin on oxidative stress and renal function in the kidney of diabetic rats.Methods: SD rats were randomly divided into normal control group(CN),diabetic control group(DM),pravastatin treatment group(DM+P) and melatonin treatment group(DM+M).Pravastatin or melatonin was given to streptozocin-induced diabetic rat for 8 weeks,then the general state and renal function of rats were evaluated.The serum and renal intrinsic anti-oxidant enzyme(AOE) activities and lipid peroxide levels were also examined.Results: Diabetic rat model was successfully induced.Compared with DM control group,the urinary protein excretion was lower in DM+M group((P<)(0.05)) and DM+P group(P<0.01).Pravastatin also decreased the renal weight/body weight ratio(P<0.05).There was no significant difference in serum lipid peroxide levels and superoxide dismutase(SOD) activities between DM+P group,DM group and DM+M group,while glutathione peroxidase(GSH-Px) activities increased significantly in DM+P group((P<)(0.01).) Pravastatin and melatonin both increaseed the SOD and GSH-Px activities in renal cortex of diabetic rats(P<0.05);pravastatin also reduced the renal lipid peroxide levels(P<0.01).Conclusion: Pravastatin can improve renal function in diabetic rats,partly due to its inhibitory effect on oxidative stress in the kidneys of diabetic rats.