Genome-wide coactivation analysis of PGC-1alpha identifies BAF60a as a regulator of hepatic lipid metabolism.

Genome-wide coactivation analysis of PGC-1alpha identifies BAF60a as a regulator of hepatic lipid metabolism.
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DOI:
10.1016/j.cmet.2008.06.013
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发表时间:
2008-08
期刊:
影响因子:
29
通讯作者:
Lin, Jiandie D.
Lin, Jiandie D.
中科院分区:
生物学1区
文献类型:
--
作者:
Li, Sinning;Liu, Chang;Li, Na;Hao, Tong;Han, Ting;Hill, David E.;Vidal, Marc;Lin, Jiandie D.

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线粒体功能受损与 2 型糖尿病、心力衰竭、神经退行性疾病以及衰老过程的发病机制有关。 PGC-1 转录共激活因子的研究表明,这些因子是控制哺乳动物细胞线粒体功能的调控网络的核心组成部分。在这里,我们描述了一种全基因组共激活测定,以全局识别该途径中的转录因子和辅因子。这些分析揭示了 PGC-1α 转录网络的分子特征,并确定 BAF60a (SMARCD1) 是 SWI/SNF 染色质重塑复合物与肝脂质代谢之间的分子联系。腺病毒介导的 BAF60a 表达可刺激培养肝细胞中的脂肪酸 β 氧化,并改善体内肝脂肪变性。 PGC-1α 介导 BAF60a 募集至 PPARα 结合位点,导致过氧化物酶体和线粒体脂肪氧化基因的转录激活。这些结果明确了 SWI/SNF 复合物在脂质稳态调节中的作用。
Impaired mitochondrial function has been implicated in the pathogenesis of type 2 diabetes, heart failure and neurodegeneration as well as during aging. Studies with the PGC-1 transcriptional coactivators have demonstrated that these factors are central components of the regulatory network that controls mitochondrial function in mammalian cells. Here we describe a genome-wide coactivation assay to globally identify transcription factors and cofactors in this pathway. These analyses revealed a molecular signature of the PGC-1α transcriptional network and identified BAF60a (SMARCD1) as a molecular link between the SWI/SNF chromatin-remodeling complexes and hepatic lipid metabolism. Adenoviral-mediated expression of BAF60a stimulates fatty acid β-oxidation in cultured hepatocytes and ameliorates hepatic steatosis in vivo. PGC-1α mediates the recruitment of BAF60a to PPARα binding sites, leading to transcriptional activation of peroxisomal and mitochondrial fat oxidation genes. These results define a role for the SWI/SNF complexes in the regulation of lipid homeostasis.
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