Circadian clock feedback cycle through NAMPT-mediated NAD+ biosynthesis.

Circadian clock feedback cycle through NAMPT-mediated NAD+ biosynthesis.
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DOI:
10.1126/science.1171641
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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:
Bass J
Bass J
中科院分区:
其他
文献类型:
--
作者:
Ramsey KM;Yoshino J;Brace CS;Abrassart D;Kobayashi Y;Marcheva B;Hong HK;Chong JL;Buhr ED;Lee C;Takahashi JS;Imai S;Bass J

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生物钟是由转录-翻译反馈回路编码的,该回路将行为和新陈代谢与光暗周期联系起来。在这里,我们报告,在哺乳动物NAD+生物合成的限速酶,烟酰胺磷酸核糖转移酶(NAMPT),和NAD+的水平,显示昼夜节律的振荡,这是由核心时钟机制在小鼠。NAMPT的抑制通过将CLOCK:BMAL 1从SIRT 1的抑制中释放出来而促进时钟基因Per 2的振荡。反过来,昼夜节律转录因子CLOCK结合并上调Nampt,从而完成涉及NAMPT/NAD+和SIRT 1/CLOCK:BMAL 1的反馈回路。
The circadian clock is encoded by a transcription-translation feedback loop that synchronizes behavior and metabolism with the light-dark cycle. Here we report that both the rate-limiting enzyme in mammalian NAD+ biosynthesis, nicotinamide phosphoribosyltransferase (NAMPT), and levels of NAD+, display circadian oscillations which are regulated by the core clock machinery in mice. Inhibition of NAMPT promotes oscillation of the clock gene Per2 by releasing CLOCK:BMAL1 from suppression by SIRT1. In turn, the circadian transcription factor CLOCK binds to and up-regulates Nampt, thus completing a feedback loop involving NAMPT/NAD+ and SIRT1/CLOCK:BMAL1.
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