Fibroblast growth factor-21 regulates PPARγ activity and the antidiabetic actions of thiazolidinediones.

Fibroblast growth factor-21 regulates PPARγ activity and the antidiabetic actions of thiazolidinediones.
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DOI:
10.1016/j.cell.2011.11.062
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发表时间:
2012-02-03
期刊:
影响因子:
64.5
通讯作者:
Kliewer SA
Kliewer SA
中科院分区:
生物学1区
文献类型:
--
作者:
Dutchak PA;Katafuchi T;Bookout AL;Choi JH;Yu RT;Mangelsdorf DJ;Kliewer SA

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成纤维细胞生长因子-21(FGF21)是一种循环中的肝细胞因子,有益于影响碳水化合物和脂肪代谢。在此,我们报道了FGF21在脂肪组织中也是一种可诱导的、反馈状态的自分泌因子,它在前馈环路中发挥作用,调节脂肪生成的主要转录调节因子--过氧化体增殖物激活受体γ(PPARγ)的活性。FGF21基因敲除(KO)小鼠表现出PPARγ信号的缺陷,包括体脂减少和依赖PPARγ的基因表达减弱。此外,FGF21-KO小鼠对PPARγ激动剂罗格列酮有益的胰岛素增敏作用和有害的体重增加和水肿副作用都是不耐受的。FGF21KO小鼠的这种功能丧失与PPARγ的苏莫化显著增加是一致的,这降低了其转录活性。加回FGF21可阻止相思甲基化,恢复PPARγ活性。综上所述,这些结果揭示了FGF21是PPARγ生理和药理作用的关键介质。
Fibroblast growth factor-21 (FGF21) is a circulating hepatokine that beneficially affects carbohydrate and lipid metabolism. Here we report that FGF21 is also an inducible, fed-state autocrine factor in adipose tissue that functions in a feed-forward loop to regulate the activity of peroxisome proliferator-activated receptor γ (PPARγ), a master transcriptional regulator of adipogenesis. FGF21-knockout (KO) mice display defects in PPARγ signaling including decreased body fat and attenuation of PPARγ-dependent gene expression. Moreover, FGF21-KO mice are refractory to both the beneficial insulin-sensitizing effects and the detrimental weight gain and edema side effects of the PPARγ agonist rosiglitazone. This loss of function in FGF21-KO mice is coincident with a marked increase in the sumoylation of PPARγ, which reduces its transcriptional activity. Adding back FGF21 prevents sumoylation and restores PPARγ activity. Collectively, these results reveal FGF21 as a key mediator of the physiologic and pharmacologic actions of PPARγ.
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