红丝线草提取物对胰岛素抵抗性脂肪肝大鼠肝脏保护作用的研究

目的：研究红丝线草Peristrophe roxburghiana提取物(HSX)对胰岛素抵抗性脂肪肝大鼠肝脏的保护作用。方法：采用高脂高糖饮食建立胰岛素抵抗脂肪肝动物模型,并预防性给予HSX高(合生药1.14 g·kg^-1)、低(合生药0.38 g·kg^-1)剂量处理8周。8周后,处死大鼠,取血测定FFA,TC,TG,HDL-C和LDL-C水平；测定FBG和FINS,并计算ISI；测定AST和ALT活性,并取全肝称重,计算肝指数,同时测定肝组织中SOD,CAT 和GSH-PX活性以及MDA含量；取肝左叶相同部位组织,常规HE染色,光镜下评估肝脏组织脂肪变性的程度。结果：HSX可明显降低模型大鼠血浆FFA和TG水平,提高血浆HDL-C水平；降低ALT和AST活性,降低肝指数,防止肝脏组织脂肪性病变；降低血中胰岛素水平和提高胰岛素敏感指数；同时,明显提高肝脏组织中SOD,CAT和GSH-PX活性,降低MDA含量。结论：HSX对高脂高糖饮食引起的胰岛素抵抗脂肪肝大鼠具有调脂保肝作用,其作用机制可能与其提高肝脏组织抗氧化能力有关。

Protecting actions of Peristrophe roxburghiane on liver functions and structure in fatty liver rats caused by insulin resistance

Objective: To observe the protecting actions of Peristrophe roxburghiane on liver functions and structure in fatty liver rats caused by insulin resistance. Method: High-fat-sugar diet was fed in rats to produce insulin resistance and fatty liver model, and then P. roxburghiane was administered for 8 weeks, and the rats were killed and the blood was sampled to measure the levels of FFA, TC, TG, HDL-C and LDL-C, and the activities of AST, ALT. The fasting serum glucose (FBG) and insulin were measured, and insulin-sensitivity index was calculated. The liver was weighed and collected to calculate liver index and measured the activities of GSH-PX, SOD, CAT and the amount of MDA. Result: High and low dosage of P. roxburghiane can decrease the levels of FFA, TG and increase the level of HDL-C, reduce the activities of ALT, AST and liver index, and reduce the damaged degree of the liver tissue significantly. High and low dosage of P. roxburghiane can significantly enhance the activities of SOD, CAT, and GSH-PX, reduce the amount of MDA. Conclusion: P. roxburghiane possesses regulating action on the serum lipid, blood glucose and insulin, and improving liver functions of fatty liver rats induced by high-fat-sugar diet, and the acting mechanism may be concerned with enhanced antioxidative ability.