Arginine starvation in colorectal carcinoma cells: Sensing, impact on translation control and cell cycle distribution.
Exp Cell Res
; 341(1): 67-74, 2016 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-26751966
ABSTRACT
Tumor cells rely on a continued exogenous nutrient supply in order to maintain a high proliferative activity. Although a strong dependence of some tumor types on exogenous arginine sources has been reported, the mechanisms of arginine sensing by tumor cells and the impact of changes in arginine availability on translation and cell cycle regulation are not fully understood. The results presented herein state that human colorectal carcinoma cells rapidly exhaust the internal arginine sources in the absence of exogenous arginine and repress global translation by activation of the GCN2-mediated pathway and inhibition of mTOR signaling. Tumor suppressor protein p53 activation and G1/G0 cell cycle arrest support cell survival upon prolonged arginine starvation. Cells with the mutant or deleted TP53 fail to stop cell cycle progression at defined cell cycle checkpoints which appears to be associated with reduced recovery after durable metabolic stress triggered by arginine withdrawal.
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Base de dados:
MEDLINE
Assunto principal:
Arginina
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Biossíntese de Proteínas
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Neoplasias Colorretais
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Ciclo Celular
Limite:
Humans
Idioma:
En
Revista:
Exp Cell Res
Ano de publicação:
2016
Tipo de documento:
Article