首页> 外文期刊>American Journal of Physiology >Regulation of Triglyceride Metabolism. II. Function of mitochondrial GPAT1 in the regulation of triacylglycerol biosynthesis and insulin action.
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Regulation of Triglyceride Metabolism. II. Function of mitochondrial GPAT1 in the regulation of triacylglycerol biosynthesis and insulin action.

机译:甘油三酸酯代谢的调节。二。线粒体GPAT1在调节甘油三酯生物合成和胰岛素作用中的功能。

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摘要

GPAT1, one of four known glycerol-3-phosphate acyltransferase isoforms, is located on the mitochondrial outer membrane, allowing reciprocal regulation with carnitine palmitoyltransferase-1. GPAT1 is upregulated transcriptionally by insulin and SREBP-1c and downregulated acutely by AMP-activated protein kinase, consistent with a role in triacylglycerol synthesis. Knockout and overexpression studies suggest that GPAT1 is critical for the development of hepatic steatosis and that steatosis initiated by overexpression of GPAT1 causes hepatic, and perhaps also peripheral, insulin resistance. Future questions include the function of GPAT1 in relation to the other GPAT isoforms and whether the lipid intermediates synthesized by GPAT and downstream enzymes in the pathway of glycerolipid biosynthesis participate in intracellular signaling pathways.
机译:GPAT1是四种已知的3-磷酸甘油酰基转移酶同工型之一,位于线粒体外膜上,可与肉碱棕榈酰转移酶-1相互调节。 GPAT1被胰岛素和SREBP-1c转录上调,并被AMP激活的蛋白激酶急剧下调,这与三酰甘油合成中的作用一致。敲除和过度表达研究表明,GPAT1对肝脂肪变性的发展至关重要,而GPAT1过度表达引发的脂肪变性会引起肝胰岛素抵抗,也可能引起外周胰岛素抵抗。未来的问题包括GPAT1与其他GPAT亚型相关的功能,以及GPAT合成的脂质中间体和甘油脂生物合成途径中的下游酶是否参与细胞内信号传导途径。

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