Diet-Induced Circadian Enhancer Remodeling Synchronizes Opposing Hepatic Lipid Metabolic Processes.

Diet-Induced Circadian Enhancer Remodeling Synchronizes Opposing Hepatic Lipid Metabolic Processes.
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DOI:
10.1016/j.cell.2018.06.031
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发表时间:
2018-08-09
期刊:
影响因子:
64.5
通讯作者:
Lazar MA
Lazar MA
中科院分区:
生物学1区
文献类型:
--
作者:
Guan D;Xiong Y;Borck PC;Jang C;Doulias PT;Papazyan R;Fang B;Jiang C;Zhang Y;Briggs ER;Hu W;Steger D;Ischiropoulos H;Rabinowitz JD;Lazar MA

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Overnutrition disrupts circadian metabolic rhythms by mechanisms that are not well understood. Here we show that diet-induced obesity (DIO) causes massive remodeling of circadian enhancer activity in mouse liver, triggering synchronous high amplitude circadian rhythms of both fatty acid (FA) synthesis and oxidation. SREBP expression was rhythmically induced by DIO, leading to circadian FA synthesis and, surprisingly, FA oxidation (FAO). DIO similarly caused a high amplitude circadian rhythm of PPARα, which was also required for FAO. Provision of a pharmacological activator of PPARα abrogated the requirement of SREBP for FAO (but not FA synthesis), suggesting that SREBP indirectly controls FAO via production of endogenous PPARα ligands. The high amplitude rhythm of PPARα imparted time-of-day-dependent responsiveness to lipid-lowering drugs. Thus, acquisition of rhythmicity for non-core clock components PPARα and SREBP1 remodels metabolic gene transcription in response to overnutrition and enables a chronopharmacological approach to metabolic disorders.
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