A truncated PPAR gamma 2 localizes to mitochondria and regulates mitochondrial respiration in brown adipocytes.

A truncated PPAR gamma 2 localizes to mitochondria and regulates mitochondrial respiration in brown adipocytes.
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DOI:
10.1371/journal.pone.0195007
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Ha K
Ha K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chang JS;Ha K

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过氧化物酶体增殖物激活受体γ是棕色脂肪细胞分化和产热的关键调节因子。PPARγ基因有两种亚型,PPARγ1和PPARγ2。PPARγ2与PPARγ1相同,只是在PPARγ2的N端增加了30个氨基酸。在这里,我们报道了PPARγ2的C端截短形式主要存在于棕色脂肪细胞的线粒体基质中,它与线粒体DNAD环区结合,该区域包含线粒体电子传输链(ETC)基因的启动子。线粒体靶向MLS-PPARγ2在棕色脂肪细胞中的表达增加了线粒体DNA编码的ETC基因的表达,同时伴随着线粒体呼吸的增强。这些结果表明,线粒体PPARγ2对线粒体编码的ETC基因表达的直接调节在一定程度上是PPARγ2在棕色脂肪细胞中的异构体特异性作用的基础。
Peroxisome proliferator-activated receptor gamma (PPARγ) is a key regulator of brown adipocyte differentiation and thermogenesis. The PPARγ gene produces two isoforms, PPARγ1 and PPARγ2. PPARγ2 is identical to PPARγ1 except for additional 30 amino acids present in the N-terminus of PPARγ2. Here we report that the C-terminally truncated form of PPARγ2 is predominantly present in the mitochondrial matrix of brown adipocytes and that it binds to the D-loop region of mitochondrial DNA (mtDNA), which contains the promoter for mitochondrial electron transport chain (ETC) genes. Expression of mitochondrially targeted MLS-PPARγ2 in brown adipocytes increases mtDNA-encoded ETC gene expression concomitant with enhanced mitochondrial respiration. These results suggest that direct regulation of mitochondrially encoded ETC gene expression by mitochondrial PPARγ2, in part, underlies the isoform-specific role for PPARγ2 in brown adipocytes.
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