ASXL2 Regulates Glucose, Lipid, and Skeletal Homeostasis.

ASXL2 Regulates Glucose, Lipid, and Skeletal Homeostasis.
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DOI:
10.1016/j.celrep.2015.05.019
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发表时间:
2015-06-16
期刊:
影响因子:
8.8
通讯作者:
Zou W
Zou W
中科院分区:
生物学1区
文献类型:
--
作者:
Izawa T;Rohatgi N;Fukunaga T;Wang QT;Silva MJ;Gardner MJ;McDaniel ML;Abumrad NA;Semenkovich CF;Teitelbaum SL;Zou W

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ASXL2是一个与PPARγ相互作用的ETP家族蛋白。我们发现ASXL2−/−小鼠是胰岛素抵抗、脂肪营养不良的,并且对高脂肪饮食没有反应。与ASXL2基因座的遗传变异和人类骨密度一致,ASXL2−/−小鼠由于破骨细胞分化失败而伴随着正常的骨形成,也是严重的骨角化。ASXL2通过两条不同的信号通路调节破骨细胞。它以PPARγ/c-Fos依赖的方式诱导破骨细胞的形成,并且是RANK配体和噻唑烷二酮诱导的骨吸收所必需的,不依赖于PGC-1β。ASXL2还促进破骨细胞线粒体的生物合成,该过程由PGC-1β介导,但不依赖于c-Fos。因此,ASXL2是骨骼、脂肪和葡萄糖动态平衡的主要调节者。
ASXL2 is an ETP family protein that interacts with PPARγ. We find that ASXL2−/− mice are insulin resistant, lipodystrophic and fail to respond to a high fat diet. Consistent with genetic variation at the ASXL2 locus and human bone mineral density, ASXL2−/− mice are also severely osteopetrotic due to failed osteoclast differentiation attended by normal bone formation. ASXL2 regulates the osteoclast via two distinct signaling pathways. It induces osteoclast formation in a PPARγ/c-Fos-dependent manner and is required for RANK ligand- and thiazolidinedione-induced bone resorption, independent of PGC-1β. ASXL2 also promotes osteoclast mitochondrial biogenesis in a process mediated by PGC-1β but independent of c-Fos. Thus, ASXL2 is a master regulator of skeletal, lipid and glucose homeostasis.
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