PPARγ agonists induce a white-to-brown fat conversion through stabilization of PRDM16 protein.

PPARγ agonists induce a white-to-brown fat conversion through stabilization of PRDM16 protein.
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DOI:
10.1016/j.cmet.2012.01.019
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发表时间:
2012-03-07
期刊:
影响因子:
29
通讯作者:
Kajimura S
Kajimura S
中科院分区:
生物学1区
文献类型:
--
作者:
Ohno H;Shinoda K;Spiegelman BM;Kajimura S

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棕色脂肪组织通过热量消耗能量,并起到抵御寒冷和肥胖的作用。已经显示过过氧化物酶体增殖物激活受体配体诱导白色脂肪细胞的布朗宁;然而,其潜在的机制仍不清楚。在这里,我们表明,过氧化物酶体增殖物激活受体配体需要充分的激动剂,以诱导棕色脂肪基因程序优先在皮下白色脂肪。这些作用需要PRDM 16的表达,PRDM 16是一种控制经典棕色脂肪发育的因子。PRDM 16的消耗减弱了PPAR激动剂罗格列酮对诱导的棕色脂肪基因程序的影响。相反,PRDM 16和罗格列酮协同激活体内棕色脂肪基因程序。这种协同作用与PRDM 16蛋白的积累增加密切相关,这在很大程度上是由于激动剂处理的细胞中蛋白半衰期的增加。鉴定稳定PRDM 16蛋白的化合物可能代表治疗肥胖和糖尿病的合理治疗途径。
Brown adipose tissue dissipates energy through heat and functions as a defense against cold and obesity. PPAR ligands have been shown to induce the browning of white adipocytes; however, the underlying mechanisms remain unclear. Here we show that PPAR ligands require full agonism to induce a brown fat gene program preferentially in subcutaneous white adipose. These effects require expression of PRDM16, a factor that controls the development of classical brown fat. Depletion of PRDM16 blunts the effects of the PPAR agonist rosiglitazone on the induced brown fat gene program. Conversely, PRDM16 and rosiglitazone synergistically activate the brown fat gene program in vivo. This synergy is tightly associated with an increased accumulation of PRDM16 protein, due in large measure to an increase in the half-life of the protein in agonist treated cells. Identifying compounds that stabilize PRDM16 protein may represent a plausible therapeutic pathway for the treatment of obesity and diabetes.
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