利拉鲁肽对高脂饮食诱导的肥胖大鼠血清网膜素1及胰岛素抵抗的影响

摘要

目的：研究利拉鲁肽对高脂饮食诱导的肥胖大鼠血清网膜素1水平及胰岛素抵抗的影响。方法雄性Wistar大鼠40只，随机分为4组：正常对照组（NC组）、高脂饮食组（HF组）、高脂饮食+利拉鲁肽低剂量组（HF+Lira 1组）及高脂饮食+利拉鲁肽高剂量组（HF+Lira 2组）。分别饲以普通颗粒饲料及高脂饲料，12周后，HF+Lira 1及HF+Lira 2组分别给予利拉鲁肽腹腔注射4周。16周各组大鼠称取体质量，心脏取血，分别进行血糖、血脂、胰岛素、网膜素1水平测定，计算胰岛素抵抗指数。结果16周后，与NC组比较，HF组大鼠体质量、甘油三酯（tG）水平明显升高（P <0.05），网膜素1水平明显下降（P <0.05），胰岛素抵抗指数明显升高（P <0.05）；总胆固醇、低密度脂蛋白胆固醇水平有所升高，高密度脂蛋白胆固醇有所下降，但无统计学差异（P >0.05）。与HF组比较，HF+Lira 1及HF+Lira 2组大鼠体质量明显下降（P <0.05），tG水平显著下降（P <0.05），网膜素1水平明显上升（P <0.05），胰岛素抵抗指数明显下降（P <0.05）；HF+Lira 2组与HF+Lira1组比较，大鼠体质量明显下降（P <0.05），tG水平显著下降（P <0.05），网膜素1水平明显上升（P <0.05），胰岛素抵抗指数明显下降（P <0.05）。结论利拉鲁肽可减轻高脂饮食诱导的肥胖，改善胰岛素抵抗，可能的机制之一是与其升高血清网膜素1水平有关，且这种作用与剂量相关。%Objective to investigate the effects of liraglutide on omentin-1 and insulin resistance in high-fat diet rats. Methods Forty male Wi-star rats were randomly divided into four groups,and respectively fed with normal diet(NC group),high-fat diet(HF group),high-fat diet with small doses of liraglutide injected intraperitoneally(HF+Lira 1 group),and high-fat diet with large doses of liraglutide injected intraperitoneally (HF+Lira 2 group). After 16 weeks,the body weight,serum lipid levels,omentin-1 and insulin were measured,and then the insulin resistance in-dex were calculated. Results the body weight,the levels of tG,and the insulin resistance index in HF group were higher than NC group,omentin-1 was lower,and the differences were statistically significant(P < 0.05). tC,LDL-C were elevated,HDL-C was reduced,but there were no statisti-cally differences(P > 0.05). Compared with HF group,the body weight,the levels of tG,and the insulin resistance index in HF+Lira 1 group and HF+Lira 2 group were lower,omentin-1 was higher,the differences were statistically significant(P < 0.05). Furthermore,the effects of HF+Lira 2 group were more pronounced. Conclusion Liraglutide can restrain high-fat diet induced obesity,and improve insulin resistance through elevated the level of omentin-1 in dose-dependent manner.