Discordant regulation of eIF2 kinase GCN2 and mTORC1 during nutrient stress.
Discordant regulation of eIF2 kinase GCN2 and mTORC1 during nutrient stress.
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DOI:
10.1093/nar/gkab362
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发表时间:
2021-06-04
影响因子:
14.9
通讯作者:
Wek RC
中科院分区:
文献类型:
--
作者:
Misra J;Holmes MJ;T Mirek E;Langevin M;Kim HG;Carlson KR;Watford M;Dong XC;Anthony TG;Wek RC
Appropriate regulation of the Integrated stress response (ISR) and mTORC1 signaling are central for cell adaptation to starvation for amino acids. Halofuginone (HF) is a potent inhibitor of aminoacylation of tRNAPro with broad biomedical applications. Here, we show that in addition to translational control directed by activation of the ISR by general control nonderepressible 2 (GCN2), HF increased free amino acids and directed translation of genes involved in protein biogenesis via sustained mTORC1 signaling. Deletion of GCN2 reduced cell survival to HF whereas pharmacological inhibition of mTORC1 afforded protection. HF treatment of mice synchronously activated the GCN2-mediated ISR and mTORC1 in liver whereas Gcn2-null mice allowed greater mTORC1 activation to HF, resulting in liver steatosis and cell death. We conclude that HF causes an amino acid imbalance that uniquely activates both GCN2 and mTORC1. Loss of GCN2 during HF creates a disconnect between metabolic state and need, triggering proteostasis collapse.
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影响因子:
14.9
作者:
Jia JJ;Lahr RM;Solgaard MT;Moraes BJ;Pointet R;Yang AD;Celucci G;Graber TE;Hoang HD;Niklaus MR;Pena IA;Hollensen AK;Smith EM;Chaker-Margot M;Anton L;Dajadian C;Livingstone M;Hearnden J;Wang XD;Yu Y;Maier T;Damgaard CK;Berman AJ;Alain T;Fonseca BD
通讯作者:
Fonseca BD
DOI:
10.1093/bioinformatics/btu638
发表时间:
2015-01-15
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
Anders S;Pyl PT;Huber W
通讯作者:
Huber W
影响因子:
4.6
作者:
Averous J;Lambert-Langlais S;Mesclon F;Carraro V;Parry L;Jousse C;Bruhat A;Maurin AC;Pierre P;Proud CG;Fafournoux P
通讯作者:
Fafournoux P
影响因子:
--
作者:
Ayala A;Muñoz MF;Argüelles S
通讯作者:
Argüelles S
影响因子:
16
作者:
Harding, HP;Novoa, I;Ron, D
通讯作者:
Ron, D