蒲黄总黄酮对2型糖尿病大鼠炎症因子和胰岛素敏感性的影响

摘要

Objective To investigate the effects of Pollen Typhae total flavone ( PTF) , an extract from Pollen Typhae which has the actions of activating blood and removing stasis, on inflammatory factors and insulin sensitivity in type 2 diabetic rats. Methods SD rats were used as the experimental animal. Type 2 diabetic rats induced by high fat diet plus low dose of streptozotocin were randomly divided into model group, PTF group (in the dosage of 200 mg·kg-1·d-1) , and rosiglitazone group (in the dosage of 4 mg·kg-1·d-1) . Additionally, normal control group was set up. After treatment for 4 weeks, plasma interleukin 6 ( IL-6) and tumor necrosis factor alpha ( TNF-α) levels were detected, the insulin tolerance test ( ITT) was performed, and the protein expression of suppressor of cytokine signaling-3 ( SOCS-3) in skeletal muscle was determined. Results After treatment for 4 weeks, the plasma levels of IL-6 and TNF-α, the homeostasis model of insulin resistance ( HOMA-IR) , and expression level of SOCS-3 in skeletal muscle in the model groups were significantly increased ( P﹤0.05) as compared with those in the normal control group, and insulin tolerance was also impaired in the model group ( P﹤0.05) . Compared with the model group, IL-6 level and HOMA-IR were markedly decreased in the PTF group ( P﹤0.05) , and the impaired insulin tolerance was obviously improved (P﹤0.05) . The level of SOCS-3 in the skeletal muscle of PTF group was also much lower than that of the model group and rosiglitazone group (P﹤0.05) . Conclusion PTF has effects on decreasing the levels of plasma IL-6 and SOCS-3 in the skeletal muscle and on improving insulin sensitivity in type 2 diabetic rats.%目的观察活血化瘀中药蒲黄提取物蒲黄总黄酮（PTF）对2型糖尿病大鼠炎症因子和胰岛素敏感性的影响。方法选用SD大鼠，采用高脂饮食+小剂量链脲佐菌素诱导2型糖尿病大鼠模型，随机分为模型组、 PTF组(剂量为200 mg·kg-1· d-1）和罗格列酮组(剂量为4 mg·kg-1·d-1），并设立对照组。干预治疗4周后，检测血浆白细胞介素(IL-6)、肿瘤坏死因子-α（TNF-α），并行胰岛素耐量试验，分析骨骼肌组织细胞因子信号转导抑制因子-3（SOCS-3）蛋白。结果治疗4周后，与对照组比较，模型组大鼠血浆IL-6、 TNF-α和胰岛素抵抗指数（HOMA-IR）以及骨骼肌组织SOCS-3水平均显著升高（P﹤0.05），胰岛素耐量试验受损（P﹤0.05）；与模型组比较， PTF组大鼠血浆IL-6和HOMA-IR水平均显著降低（P﹤0.05），胰岛素耐量试验受损得到显著改善（P﹤0.05），骨骼肌组织SOCS-3水平均显著低于模型组和罗格列酮组（P﹤0.05）。结论PTF能降低2型糖尿病大鼠血浆IL-6和骨骼肌组织SOCS-3水平，改善其胰岛素敏感性。