过氧化物酶体增殖物活化受体与胰岛素抵抗(2)
作者:佚名; 更新时间:2014-12-13
酰辅酶A的表达,也未增加FFA从脂肪组织向肌肉组织的释放,从而导致脂肪酸滞留于脂肪组织,使全身可利用的脂肪酸减少。因此,PPARγ可通过葡萄糖与脂肪酸的代谢过程,加快脂肪酸的消耗,从而改善胰岛素的敏感性。(3)PPARγ形成PPAR-RXR二聚体的作用机制:如前所述,PPARγ形成PPAR-RXR二聚体后可增加WAT中的总胆固醇(TG)含量,使肝脏/肌肉中的TG含量降低,从而改善高脂饮食诱导的肥胖和胰岛素抵抗。研究证明〔17〕,PPARγ的外显子B存在相当普遍的多态性,例如Prol2Ala多态性在多个民族中与体质指数和心血管疾病的发病率的降低以及胰岛素敏感性的升高有关。Alal2等位基因的胰岛素增敏效应只在具有低出生体重的研究对象中才发现,表明出生后的环境因素能改变PPAR γ的活性。基因-生活方式的相互作用可能调节Prol2Ala多态性对体重的增加以及2型糖尿病发病风险的影响。这反映了胰岛素复杂的、多基因的本质以及多环境因素对表型的影响作用。



  4   结语

  胰岛素抵抗可导致多种疾病,因此,研究胰岛素抵抗的机制十分重要。PPARs是噻唑烷二酮类药物(TZDs)治疗胰岛素抵抗的作用靶点〔1〕。该类药物能激活PPARγ,从而减少FFA和TNF-α的释放及增加脂联素的分泌来调节脂肪组织的发育及代谢。此外,PPARα调节游离脂肪酸氧化的能力暗示了这一受体的激活机制治疗胰岛素抵抗的潜能。实验研究指出〔18〕,PPARα的激活还能显著降低心血管疾病的发生率。显然,研究PPARs在治疗和预防胰岛素抵抗中的机制有着重要的学术价值和临床应用前景。

 

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