Circadian control of bile acid synthesis by a KLF15-Fgf15 axis.

Circadian control of bile acid synthesis by a KLF15-Fgf15 axis.
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DOI:
10.1038/ncomms8231
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发表时间:
2015-06-04
影响因子:
16.6
通讯作者:
Jain, Mukesh K.
Jain, Mukesh K.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Han, Sean (Shuxin);Zhang, Rongli;Jain, Rajan;Shi, Hong;Zhang, Lilei;Zhou, Guangjin;Sangwung, Panjamaporn;Tugal, Derin;Atkins, G. Brandon;Prosdocimo, Domenick A.;Lu, Yuan;Han, Xiaonan;Tso, Patrick;Liao, Xudong;Epstein, Jonathan A.;Jain, Mukesh K.

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Circadian control of nutrient availability is critical to efficiently meet the energetic demands of an organism. Production of bile acids (BAs), which facilitate digestion and absorption of nutrients, is a major regulator of this process. Here we identify a KLF15-Fgf15 signalling axis that regulates circadian BA production. Systemic Klf15 deficiency disrupted circadian expression of key BA synthetic enzymes, tissue BA levels and triglyceride/cholesterol absorption. Studies in liver-specific Klf15-knockout mice suggested a non-hepatic basis for regulation of BA production. Ileal Fgf15 is a potent inhibitor of BA synthesis. Using a combination of biochemical, molecular and functional assays (including ileectomy and bile duct catheterization), we identify KLF15 as the first endogenous negative regulator of circadian Fgf15 expression. Elucidation of this novel pathway controlling circadian BA production has important implications for physiologic control of nutrient availability and metabolic homeostasis. Bile acids are important for the absorption of nutrients. Here the authors provide a molecular explanation for the oscillatory release of bile acids, showing that diurnal expression of the transcription factor KLF15 regulates FGF15 secretion from enterocytes, which then inhibits bile acid synthesis in the liver.
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