Glutamine metabolism regulates autophagy-dependent mTORC1 reactivation during amino acid starvation.

Abstract:

:Activation of autophagy and elevation of glutamine synthesis represent key adaptations to maintain amino acid balance during starvation. In this study, we investigate the role of autophagy and glutamine on the regulation of mTORC1, a critical kinase that regulates cell growth and proliferation. We report that supplementation of glutamine alone is sufficient to restore mTORC1 activity during prolonged amino acid starvation. Inhibition of autophagy abolishes the restorative effect of glutamine, suggesting that reactivation of mTORC1 is autophagy-dependent. Inhibition of glutaminolysis or transamination impairs glutamine-mediated mTORC1 reactivation, suggesting glutamine reactivates mTORC1 specifically through its conversion to glutamate and restoration of non-essential amino acid pool. Despite a persistent drop in essential amino acid pool during amino acid starvation, crosstalk between glutamine and autophagy is sufficient to restore insulin sensitivity of mTORC1. Thus, glutamine metabolism and autophagy constitute a specific metabolic program which restores mTORC1 activity during amino acid starvation.mTORC1 is a critical kinase that regulates cell growth and proliferation. Here the authors show that glutamine metabolism is sufficient to restore mTORC1 activity during prolonged amino acid starvation in an autophagy-dependent manner.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tan HWS,Sim AYL,Long YC

doi

10.1038/s41467-017-00369-y

subject

Has Abstract

pub_date

2017-08-24 00:00:00

pages

338

issue

1

issn

2041-1723

pii

10.1038/s41467-017-00369-y

journal_volume

8

pub_type

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