STAT3 Undergoes Acetylation-dependent Mitochondrial Translocation to Regulate Pyruvate Metabolism.

STAT3 Undergoes Acetylation-dependent Mitochondrial Translocation to Regulate Pyruvate Metabolism.
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STAT3 经历乙酰化依赖性线粒体易位来调节丙酮酸代谢

DOI:
10.1038/srep39517
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发表时间:
2016-12-22
期刊:
影响因子:
4.6
通讯作者:
Chin YE
Chin YE
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xu YS;Liang JJ;Wang Y;Zhao XJ;Xu L;Xu YY;Zou QC;Zhang JM;Tu CE;Cui YG;Sun WH;Huang C;Yang JH;Chin YE

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细胞质STAT 3在被生长因子激活后,易位到不同的亚细胞区室,包括细胞核和线粒体,在那里它执行不同的生物学功能。然而,STAT 3经历线粒体易位并随后调节三羧酸(TCA)循环电子传递链(ETC)的精确机制仍然知之甚少。在这里,我们通过观察血清再引入或胰岛素刺激后饥饿细胞中STAT 3的乙酰化来阐明这一过程。CBP-乙酰化的STAT 3响应于血清引入或胰岛素刺激而经历线粒体易位。在线粒体中,STAT 3与丙酮酸脱氢酶复合物E1(PDC-E1)结合,随后加速丙酮酸转化为乙酰辅酶A,提高线粒体膜电位,并促进ATP合成。SIRT 5使STAT 3去乙酰化,从而抑制其在线粒体丙酮酸代谢中的功能。在A549肺癌细胞系中,组成型乙酰化的STAT 3定位于线粒体,在那里它维持线粒体膜电位和ATP合成处于活性状态。
Cytoplasmic STAT3, after activation by growth factors, translocates to different subcellular compartments, including nuclei and mitochondria, where it carries out different biological functions. However, the precise mechanism by which STAT3 undergoes mitochondrial translocation and subsequently regulates the tricarboxylic acid (TCA) cycle-electron transport chain (ETC) remains poorly understood. Here, we clarify this process by visualizing STAT3 acetylation in starved cells after serum reintroduction or insulin stimulation. CBP-acetylated STAT3 undergoes mitochondrial translocation in response to serum introduction or insulin stimulation. In mitochondria, STAT3 associates with the pyruvate dehydrogenase complex E1 (PDC-E1) and subsequently accelerates the conversion of pyruvate to acetyl-CoA, elevates the mitochondrial membrane potential, and promotes ATP synthesis. SIRT5 deacetylates STAT3, thereby inhibiting its function in mitochondrial pyruvate metabolism. In the A549 lung cancer cell line, constitutively acetylated STAT3 localizes to mitochondria, where it maintains the mitochondrial membrane potential and ATP synthesis in an active state.
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