非诺贝特对胰岛素抵抗大鼠脂肪甘油三酯脂酶表达的影响
2018-04-26祝超瑜肖元元叶阳刘梦丹曾媛媛魏丽
祝超瑜 肖元元 叶阳 刘梦丹 曾媛媛 魏丽



[摘要] 目的 观察非诺贝特对胰岛素抵抗大鼠组织中脂肪甘油三酯脂酶(ATGL)表达的影响。 方法 将8周龄雄性SD大鼠随机分为普食组(NC组,n = 8)及高脂组(HFD组,n = 16),8周后再将HFD组随机分为高脂对照组(HFD-UT组)及非诺贝特治疗组(HFD-FT组)。检测各组大鼠生化指标,并用胰岛素耐量试验(ITT)、口服葡萄糖耐量试验(OGTT)判断大鼠的胰岛敏感性。通过Western blot方法检测脂肪、肝脏、肌肉组织中ATGL的表达情况。 结果 高脂饮食喂养后大鼠产生胰岛素抵抗,脂肪、肝脏、肌肉组织中ATGL蛋白较NC组分别降低,差异有高度统计学意义(P < 0.01),用非诺贝特治疗后,胰岛素敏感性增加,同时,脂肪、肝脏、肌肉组织中ATGL的表达较HFD-UT组增加,差异有统计学意义(P < 0.01或P < 0.05)。 结论 非诺贝特能促进胰岛素抵抗大鼠脂肪、肝脏、肌肉三大代谢组织中ATGL的表达。
[关键词] 高脂饮食;脂肪甘油三酯脂酶;胰岛素抵抗;非诺贝特
[中图分类号] R589.2 [文献标识码] A [文章编号] 1673-7210(2018)02(a)-0004-05
Effects of Fenofibrate on adipose triglyceride lipase in insulin resistant rats
ZHU Chaoyu XIAO Yuanyuan YE Yang LIU Mengdan ZENG Yuanyuan WEI Li
Department of Endocrinology and Metabolism, the Sixth People's Hospital, Shanghai Jiao Tong University Shanghai Diabetes Institute Shanghai Key Laboratory of Diabetes Mellitus Shanghai Clinical Center for Diabetes, Shanghai 200233, China
[Abstract] Objective To detect the effects of Fenofibrate on the expression of adipose triglyceride lipase (ATGL) in tissues of insulin resistant rats. Methods Eight-week old male SD rats were randomly divided into normal diet group (NC group, n = 8) and high fat diet group (HFD group, n = 16). After 8 weeks, the rats in the HFD group were divided into untreated (HFD-UT) group and Fenofibrate treatment (HFD-FT) group. The biochemical indices of all groups were detected, and the insulin sensitivity was detected by oral glucose tolerance (OGTT) and insulin tolerance (ITT). Western blot was used to assay ATGL protein in epididymal adipose, liver and muscle. Results High fat diet led to insulin resistance, ATGL in adipose tissue, liver and muscle in HFD-UT group were decreased compared with those of NC group, the differences were highly statistically significant (P < 0.01). After Fenofibrate treatment, the insulin sensitivity was improved, and the ATGL levels in adipose tissue, liver and muscle were increased compared with those of HFD-UT group, the differences were statistically significant (P < 0.01 or P < 0.05). Conclusion Fenofibrate can enhance the ATGL levels in adipose tissue, liver and muscle of insulin resistant rats.
[Key words] High fat diet; Adipose triglyceride lipase; Insulin resistance; Fenofibrate
脂肪甘油三酯脂酶(adipose triglyceride lipase,ATGL)是三酰甘油(TG)水解的限速酶[1]。ATGL主要在脂肪組织中产生,在肝脏、肌肉等代谢器官中也有表达。TG的异位沉积能破坏胰岛素信号的传导[2],而作为胰岛素作用的靶器官,脂肪、肝脏、肌肉三个组织中TG的代谢显得尤为重要,探讨ATGL在这三大组织中的作用将有助于进一步明确脂代谢异常在胰岛素抵抗过程中的作用。基因转录因子过氧化物酶体增殖物激活受体(peroxisome proliferator activated receptor,PPAR)在脂肪酸氧化代谢活跃的组织中,如脂肪、肝脏、骨骼肌、肾、小肠等,都有表达,主要参与脂肪酸的氧化及能量的消耗。PPARɑ受体激动剂类药物非诺贝特可改善高甘油三酯血症及炎性反应[3],有研究证明其通过降低血脂有改善胰岛素敏感性的作用[4],最新研究显示其有延缓脂肪肝的作用[5],但是其对改善组织中TG沉积的作用机制目前尚不清楚。……
