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首页> 外文期刊>Cell metabolism >TANK-Binding Kinase 1 Regulates the Localization of Acyl-CoA Synthetase ACSL1 to Control Hepatic Fatty Acid Oxidation
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TANK-Binding Kinase 1 Regulates the Localization of Acyl-CoA Synthetase ACSL1 to Control Hepatic Fatty Acid Oxidation

机译:罐结合激酶1调节酰基-CoA合成酶ACSL1的定位以控制肝脂肪酸氧化

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摘要

Hepatic TANK (TRAF family member associated NFkB activator)-binding kinase 1 (TBK1) activity is increased during obesity, and administration of a TBK1 inhibitor reduces fatty liver. Surprisingly, liver-specific TBK1 knockout in mice produces fatty liver by reducing fatty acid oxidation. TBK1 functions as a scaffolding protein to localize acyl-CoA synthetase long-chain family member 1 (ACSL1) to mitochondria, which generates acyl-CoAs that are channeled for beta-oxidation. TBK1 is induced during fasting and maintained in the unphosphorylated, inactive state, enabling its high affinity binding to ACSL1 in mitochondria. In TBK1-deficient liver, ACSL1 is shifted to the endoplasmic reticulum to promote fatty acid re-esterification in lieu of oxidation in response to fasting, which accelerates hepatic lipid accumulation. The impaired fatty acid oxidation in TBK1-deficient hepatocytes is rescued by the expression of kinase-dead TBK1. Thus, TBK1 operates as a rheostat to direct the fate of fatty acids in hepatocytes, supporting oxidation when inactive during fasting and promoting re-esterification when activated during obesity.
机译:肥胖期间,肝细胞(TRAF家族成员相关NFkB激活剂)-结合激酶1(TBK1)活性增加,服用TBK1抑制剂可减少脂肪肝。令人惊讶的是,小鼠肝脏特异性TBK1基因敲除通过减少脂肪酸氧化而产生脂肪肝。TBK1作为支架蛋白将酰基辅酶a合成酶长链家族成员1(ACSL1)定位到线粒体,线粒体产生酰基辅酶a,并引导β氧化。TBK1在禁食期间被诱导,并保持在非磷酸化、非活性状态,使其与线粒体中的ACSL1具有高亲和力结合。在TBK1缺乏的肝脏中,ACSL1转移到内质网,以促进脂肪酸再酯化,而不是在空腹时氧化,从而加速肝脏脂质积累。TBK1缺陷肝细胞中受损的脂肪酸氧化通过激酶死亡TBK1的表达得以挽救。因此,TBK1作为一个变阻器来控制肝细胞中脂肪酸的命运,在禁食期间不活动时支持氧化,在肥胖期间激活时促进再酯化。

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