Caloric restriction effects on liver mTOR signaling are time-of-day dependent.

Caloric restriction effects on liver mTOR signaling are time-of-day dependent.
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DOI:
10.18632/aging.101498
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发表时间:
2018-07-16
期刊:
Aging
影响因子:
--
通讯作者:
Kondratov R
Kondratov R
中科院分区:
其他
文献类型:
--
作者:
Tulsian R;Velingkaar N;Kondratov R

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雷帕霉素(mTOR)信号传导的机制靶点的调节有助于卡路里限制(CR)饮食的代谢效应。我们在一天中的六个不同时间测定了CR对小鼠肝脏中mTOR复合物1(mTORC 1)和mTOR复合物2(mTORC 2)活性的影响。CR对mTORC 1和mTORC 2活性的影响具有时间依赖性。CR在一个时间点诱导mTORC 1活性,在两个时间点降低,在其他时间点没有影响。CR在一天中的一个时间诱导mTORC2活性,在其他时间没有影响。生物钟在哺乳动物mTOR信号转导的调节和CR的机制中实施。我们测定了CR对缺乏昼夜节律转录调节因子BMAL1和BMAL2的小鼠肝脏中mTOR信号传导的影响。在两种时钟突变体中观察到CR诱导的mTORC 1活性抑制,而在CRY缺陷小鼠的肝脏中观察到mTORC 2的上调,但在BMAL 1缺陷小鼠的肝脏中未观察到。我们的研究结果表明,CR对mTOR复合物1和2的活性具有不同的时间依赖性效应,并表明生物钟蛋白BMAL1参与了哺乳动物CR后mTORC2的上调。
The regulation of mechanistic target of rapamycin (mTOR) signaling contributes to the metabolic effects of a calorie restriction (CR) diet. We assayed the effect of CR on the activity of mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2) in the liver of mice at six different times across the day. CR effects on mTORC1 and mTORC2 activities were time-of-day dependent. CR induced mTORC1 activity at one time, reduced at two times and has no effect during other times. CR induced mTORC2 activity at one time of the day and has no effects at other times. Circadian clocks are implemented in the regulation of mTOR signaling in mammals and mechanisms of CR. We assayed the effect of CR on mTOR signaling in the liver of mice deficient for circadian transcriptional regulators BMAL1 and CRYs. The CR induced suppression of mTORC1 activity was observed in both clock mutants, while up regulation of mTORC2 was observed in the liver of CRY deficient but not in the liver of BMAL1 deficient mice. Our finding revealed that CR has different time dependent effect on the activity of mTOR complexes 1 and 2 and suggest that circadian clock protein BMAL1 is involved in the up regulation of mTORC2 upon CR in mammals.
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