白藜芦醇对妊娠期糖尿病大鼠血糖及氧化应激影响的研究

目的：研究白藜芦醇（Resveratrol）对妊娠期糖尿病大鼠血糖及氧化应激水平的影响。方法：取100只妊娠5天的SD大鼠，通过一次性腹腔注射链脲佐菌素（Streptozotocin，STZ）35 mg?kg^-1制备大鼠糖尿病模型，随机分为6组：妊娠糖尿病模型对照组4组，各组白藜芦醇的注射量分别为30、60、120和240 mg?kg^-1，每组20只；正常妊娠对照组为20只妊娠5天SD大鼠；正常非妊娠对照组为20只非妊娠雌性大鼠。分别检测各组在第0、7、14天的空腹血浆血糖和胰岛素水平；治疗满2周后，检测各组大鼠血清中丙二醛（Malondialdehyde，MDA）、超氧化物歧化酶（Superoxide Dismutase，SOD）、谷胱甘肽过氧化物酶（Glutathione Peroxidase，GSH-Px）、过氧化氢酶（Catalase，CAT）的水平或活性。结果：与正常非妊娠对照组相比，正常妊娠对照组的大鼠空腹血浆血糖和胰岛素水平、血清中MDA 含量和SOD、GSH-Px、CAT活性均无显著性差异（P>0.05）；与妊娠期糖尿病模型组相比，白藜芦醇（30、60、120 和240 mg?kg^-1）治疗组大鼠血清中MDA含量显著降低（P<0.05，P<0.01）；白藜芦醇（120 和240 mg?kg^-1）治疗组大鼠血糖水平显著降低、胰岛素水平显著升高（P<0.05，P<0.01），大鼠血清中SOD、GSH-Px、CAT活性显著升高（P<0.05，P<0.01）。结论：白藜芦醇对妊娠期糖尿病大鼠有降低血糖、提高抗氧化能力的作用，且具有剂量依赖性，该作用可能与其能够有效提高胰岛素水平和改善抗氧化酶系统的活性有关。

Effects of Resveratrol on Plasma Glucose and Oxidative Stress Ability in Gestational Diabetic Rats

This study was aimed to investigate the effects of resveratrol on plasma glucose and the oxidative stress ability in gestational diabetic rats. A total of 100 SD rats with gestation for 5 days were intraperitoneally injected with streptozotocin (STZ, 35 mg?kg^-1) to prepare gestational diabetic rat model. Rats were randomly divided into 6 groups, which were the normal gestation group, gestational diabetic model group, resveratrol (30, 60, 120 and 240 mg?kg^-1) treatment groups, with 20 rats in each group. A total of 20 rats with gestation for 5 days were selected as the normal gestation control group and another 20 rats with no gestation were selected as the normal control group. The levels of plasma glucose and insulin were determined on 0, 7, 14 days after experiment. Two weeks later, the contents of malondialdehyde (MDA) and the activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase (CAT) in serum were determined. The results showed that compared with the normal control group, there were no significant difference on the leve ls of plasma glucose and ins ulin, the content of MDA, and the activities of SOD, GSH-Px and CAT of the normal gestation control group (P > 0.05). Compared with the gestational diabetic model group, the content of MDA in serum of the resveratrol (30, 60, 120 and 240 mg?kg^-1) treatment groups were significantly decreased (P < 0.05, P < 0.01); the level of plasma glucose were significantly decreased and the level of insulin was significantly increased of the resveratrol (120 and 240 mg?kg^-1) treatment groups (P < 0.05, P < 0.01); the activities of SOD, GSH-Px and CAT were also significantly increased (P < 0.05, P < 0.01). It was concluded that resveratrol had dose-dependent effect on reducing plasma glucose and improving antioxidant ability in gestational diabetic rats, which perhaps related to its effects on raising the level of insulin and improving the activity of antioxidant enzymes.