کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2130040 | 1086522 | 2016 | 8 صفحه PDF | دانلود رایگان |
• Arginine withdrawal causes a rapid and dramatic drop of its intracellular level.
• Starvation for arginine activates GCN2 and decreases mTOR cellular signaling.
• Response to arginine starvation depends on p53 status of the cells.
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.
Journal: Experimental Cell Research - Volume 341, Issue 1, 1 February 2016, Pages 67–74