葛根素对STZ诱导的糖尿病大鼠视网膜的保护作用及机制研究

目的探讨葛根素对糖尿病大鼠视网膜的保护作用及可能机制。方法 40只♂SD大鼠随机分为正常对照组、糖尿病(DM)模型组、DM+葛根素低剂量组(Pue1组)、DM+葛根素高剂量组(Pue2组)。给药后4周,行视网膜组织病理学检查,荧光法检测视网膜晚期糖基化终末产物(ad-vanced glycation end products,AGEs)含量、Real-time PCR法、Western blot法分别检测视网膜组织晚期糖基化终末产物受体(receptor of advanced glycation end products,RAGE)、血管内皮生长因子(vascular endothelial growth factor,VEGF)mR-NA表达和蛋白水平。结果 DM组视网膜外核层细胞厚度明显变薄,Pue2组较DM组有所好转。DM大鼠视网膜中VEGF的mRNA和蛋白表达水平均明显高于正常对照组(P<0.01);Pue1、Pue2组VEGF的mRNA和蛋白表达水平均明显下降(P<0.01)。DM大鼠视网膜内AGEs水平较正常对照组明显上调(P<0.05),高剂量葛根素能抑制AGEs形成(P<0.05)。RT-PCR与Western blot结果显示,DM大鼠视网膜中RAGE的mRNA水平和蛋白表达均高于正常对照组(P<0.05),高剂量葛根素可使之下调(P<0.05)。结论葛根素可抑制DM大鼠视网膜AGEs形成及RAGE的表达,抑制视网膜VEGF的表达,起到保护糖尿病大鼠视网膜的作用。

Experiment effect of puerarin on retina in diabetic rats induced by streptozotocin and its mechanisms

Aim To investigate the effect of puerarin(Pue) on the retina of diabetic rats and the mechanism.Methods Fouth male Sprague-Dawley rats were randomly divided into 4 groups:normal control group;diabetic model group(group DM);DM+low-concentration Pue-treated group(group Pue 1);DM+high-concentration Pue-treated group(group Pue2).After 4 weeks,histopathologic examination was carried out and AGEs in retina were detectd by fluorescence method.The expression of RAGE and VEGFwas measured by RT-PCR and Western blot a...