Translational control of entrainment and synchrony of the suprachiasmatic circadian clock by mTOR/4E-BP1 signaling.
Translational control of entrainment and synchrony of the suprachiasmatic circadian clock by mTOR/4E-BP1 signaling.
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DOI:
10.1016/j.neuron.2013.06.026
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发表时间:
2013-08-21
期刊:
影响因子:
16.2
通讯作者:
Sonenberg N
中科院分区:
文献类型:
--
作者:
Cao R;Robinson B;Xu H;Gkogkas C;Khoutorsky A;Alain T;Yanagiya A;Nevarko T;Liu AC;Amir S;Sonenberg N
Protein synthesis is critical for circadian clock function, but little is known on how translational regulation controls the master pacemaker in mammals, the suprachiasmatic nucleus (SCN). Here we demonstrate that the pivotal translational repressor, the eukaryotic translational initiation factor 4E binding protein 1(4E-BP1) is rhythmically regulated via the mechanistic target of rapamycin (mTOR) signaling in the SCN and preferentially represses vasoactive intestinal peptide (Vip) mRNA translation. Knockout (KO) of Eif4ebp1 (gene encoding 4E-BP1) leads to upregulation of VIP and higher amplitude of molecular rhythms in the SCN. Consequently, the 4E-BP1 null mice exhibit accelerated re-entrainment to a shifted light/dark cycle and are more resistant to the rhythm-disruptive effects of constant light. Conversely, in Mtor+/− mice VIP expression is decreased and susceptibility to the effects of constant light is increased. These results reveal a novel role for mTOR/4E-BP1-mediated translational control in regulating entrainment and synchrony of the master clock.
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