Circadian control of the NAD+ salvage pathway by CLOCK-SIRT1.

Circadian control of the NAD+ salvage pathway by CLOCK-SIRT1.
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Clock-sirt1对NAD+打捞途径的昼夜节律控制。

DOI:
10.1126/science.1170803
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发表时间:
2009-05-01
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Sassone-Corsi P
Sassone-Corsi P
中科院分区:
其他
文献类型:
--
作者:
Nakahata Y;Sahar S;Astarita G;Kaluzova M;Sassone-Corsi P

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许多代谢和生理过程显示昼夜节律振荡。我们已经证明,核心的昼夜节律调节因子CLOCK是一种组蛋白乙酰转移酶,其活性由NAD+依赖性组蛋白去乙酰化酶SIRT1来平衡。在这里,我们发现细胞内NAD+水平以24小时的节奏循环,这是一种由生物钟驱动的振荡。CLOCK:BMAL1调节NAMPT(烟酰胺磷酸核糖基转移酶)的昼夜表达,NAMPT是NAD+挽救途径中的限速步骤酶。SIRT1被招募到Nampt启动子中,并参与其自身辅酶的昼夜合成。使用特异性抑制剂FK866,我们证明了NAMPT是调节昼夜节律基因表达所必需的。我们的发现揭示了一个互锁的转录-酶反馈回路,控制着细胞代谢和昼夜节律之间的分子相互作用。
Many metabolic and physiological processes display circadian oscillations. We have shown that the core circadian regulator, CLOCK, is a histone acetyltransferase whose activity is counterbalanced by the NAD+-dependent histone deacetylase SIRT1. Here we show that intracellular NAD+ levels cycle with a 24 h rhythm, an oscillation driven by the circadian clock. CLOCK:BMAL1 regulate the circadian expression of NAMPT (nicotinamide phosphoribosyltransferase), a rate limiting step enzyme in the NAD+ salvage pathway. SIRT1 is recruited to the Nampt promoter and contributes to the circadian synthesis of its own coenzyme. Using the specific inhibitor FK866, we demonstrate that NAMPT is required to modulate circadian gene expression. Our findings reveal an interlocked transcriptional-enzymatic feedback loop that governs the molecular interplay between cellular metabolism and circadian rhythms.
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