CLOCK/BMAL1 regulates circadian change of mouse hepatic insulin sensitivity by SIRT1

CLOCK/BMAL1 regulates circadian change of mouse hepatic insulin sensitivity by SIRT1
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CLOCK/BMAL1通过SIRT1调节小鼠肝脏胰岛素敏感性的昼夜变化

DOI:
10.1002/hep.26992
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发表时间:
2014-06
期刊:
影响因子:
13.5
通讯作者:
Qiwei Zhai
Qiwei Zhai
中科院分区:
医学1区
文献类型:
--
作者:
Yuangao Wang;Yanan Hu;Jingxia Wu;Changgui Dai;Hui Wang;Yanyang Tu;Xiaozhong Peng;Yiqian Wang;Qiwei Zhai

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去乙酰化酶sirtuin 1(SIRT 1)参与调节肝脏胰岛素敏感性,具有昼夜节律振荡并调节生物钟。最近的研究表明,昼夜节律失调导致胰岛素抵抗(IR),然而,其潜在的机制在很大程度上是未知的。在这里,我们发现CLOCK和脑和肌肉ARNT样蛋白1(BMAL 1),两个核心昼夜节律转录因子,与肝脏胰岛素敏感性相关。敲低CLOCK或BMAL 1可诱导肝脏IR,而其异位表达可减弱肝脏IR。此外,Clock突变、肝脏特异性Bmal 1敲除(KO)或Sirt 1敲除小鼠中胰岛素敏感性的昼夜变化受损,并且CLOCK和BMAL 1是SIRT 1肝脏昼夜表达所必需的。进一步的研究表明,CLOCK/BMAL 1与SIRT 1启动子结合以增强其表达,并通过SIRT 1调节肝脏胰岛素敏感性。此外,持续黑暗诱导的小鼠昼夜节律失调降低了肝脏BMAL 1和SIRT 1水平,并诱导IR,这可以被白藜芦醇显著逆转。结论:这些发现为通过CLOCK/BMAL 1依赖性SIRT 1表达对肝脏胰岛素敏感性的昼夜节律调节来协调肝细胞的昼夜节律钟和代谢提供了新的见解,并提供了白藜芦醇用于对抗昼夜节律失调诱导的代谢紊乱的潜在应用。(肝病学2014;59:2196-2206)
The protein deacetylase, sirtuin 1 (SIRT1), involved in regulating hepatic insulin sensitivity, shows circadian oscillation and regulates the circadian clock. Recent studies show that circadian misalignment leads to insulin resistance (IR); however, the underlying mechanisms are largely unknown. Here, we show that CLOCK and brain and muscle ARNT‐like protein 1 (BMAL1), two core circadian transcription factors, are correlated with hepatic insulin sensitivity. Knockdown of CLOCK or BMAL1 induces hepatic IR, whereas their ectopic expression attenuates hepatic IR. Moreover, circadian change of insulin sensitivity is impaired in Clock mutant, liver‐specific Bmal1 knockout (KO) or Sirt1 KO mice, and CLOCK and BMAL1 are required for hepatic circadian expression of SIRT1. Further studies show that CLOCK/BMAL1 binds to the SIRT1 promoter to enhance its expression and regulates hepatic insulin sensitivity by SIRT1. In addition, constant darkness‐induced circadian misalignment in mice decreases hepatic BMAL1 and SIRT1 levels and induces IR, which can be dramatically reversed by resveratrol. Conclusion: These findings offer new insights for coordination of the circadian clock and metabolism in hepatocytes by circadian regulation of hepatic insulin sensitivity via CLOCK/BMAL1‐dependent SIRT1 expression and provide a potential application of resveratrol for combating circadian misalignment‐induced metabolic disorders. (Hepatology 2014;59:2196–2206)
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