Tyk2 and Stat3 regulate brown adipose tissue differentiation and obesity.

Tyk2 and Stat3 regulate brown adipose tissue differentiation and obesity.
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DOI:
10.1016/j.cmet.2012.11.005
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发表时间:
2012-12-05
期刊:
影响因子:
29
通讯作者:
Larner AC
Larner AC
中科院分区:
生物学1区
文献类型:
--
作者:
Derecka M;Gornicka A;Koralov SB;Szczepanek K;Morgan M;Raje V;Sisler J;Zhang Q;Otero D;Cichy J;Rajewsky K;Shimoda K;Poli V;Strobl B;Pellegrini S;Harris TE;Seale P;Russell AP;McAinch AJ;O'Brien PE;Keller SR;Croniger CM;Kordula T;Larner AC

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缺乏Jak酪氨酸激酶成员Tyk 2的小鼠由于Myf 5+棕色脂肪组织(BAT)的异常发育而变得进行性肥胖。BAT和骨骼肌中的Tyk 2 RNA水平,其与BAT共享共同的祖先,在高脂肪饮食的小鼠和肥胖的人中显著降低。Tyk 2或转录因子Stat 3(CAStat 3)的组成型活性形式的表达恢复Tyk 2 −/−棕色前脂肪细胞的分化。此外,在BAT中表达CAStat 3转基因的Tyk 2 −/−小鼠也显示出改善的BAT发育、正常的胰岛素水平和显著降低的体重。Stat 3与BAT分化的主要调节因子PRDM 16结合,并增强PRDM 16蛋白的稳定性。这些结果将Tyk 2和Stat 3定义为棕色脂肪谱系的关键决定因素,并表明Tyk 2水平的改变与啮齿动物和人类的肥胖相关。
Mice lacking the Jak tyrosine kinase member Tyk2 become progressively obese due to aberrant development of Myf5+ brown adipose tissue (BAT). Tyk2 RNA levels in BAT and skeletal muscle, which shares a common progenitor with BAT, are dramatically decreased in mice placed on a high fat diet and in obese humans. Expression of Tyk2 or the constitutively active form of the transcription factor Stat3 (CAStat3) restores differentiation in Tyk2−/− brown preadipocytes. Furthermore, Tyk2−/− mice expressing CAStat3 transgene in BAT also show improved BAT development, normal levels of insulin and significantly lower body weights. Stat3 binds to PRDM16, a master regulator of BAT differentiation, and enhances the stability of PRDM16 protein. These results define Tyk2 and Stat3 as critical determinants of brown fat-lineage and suggest that altered levels of Tyk2 are associated with obesity in both rodents and humans.
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