mTORC1 directly inhibits AMPK to promote cell proliferation under nutrient stress

Journal article


Ling, Naomi X. Y., Kaczmarek, Adrian, Hoque, Ashfaqul, Davie, Elizabeth, Ngoei, Kevin R. W., Morrison, Kaitlin R., Smiles, William J., Forte, Gabriella M., Wang, Tingting, Lie, Shervi, Dite, Toby A., Langendorf, Christopher G., Scott, John W., Oakhill, Jonathan S. and Petersen, Janni. (2020). mTORC1 directly inhibits AMPK to promote cell proliferation under nutrient stress. Nature Metabolism. 2, pp. 41-49. https://doi.org/10.1038/s42255-019-0157-1
AuthorsLing, Naomi X. Y., Kaczmarek, Adrian, Hoque, Ashfaqul, Davie, Elizabeth, Ngoei, Kevin R. W., Morrison, Kaitlin R., Smiles, William J., Forte, Gabriella M., Wang, Tingting, Lie, Shervi, Dite, Toby A., Langendorf, Christopher G., Scott, John W., Oakhill, Jonathan S. and Petersen, Janni
Abstract

Highly conserved signalling pathways controlled by mammalian target of rapamycin (mTOR) and AMP-activated protein kinase (AMPK) are central to cellular metabolism and cell proliferation1,2, and their dysregulation is implicated in the pathogenesis of major human diseases such as cancer and type 2 diabetes. AMPK pathways leading to reduced cell proliferation are well established and, in part, act through inhibition of TOR complex 1 (TORC1) activity. Here we demonstrate reciprocal regulation, specifically that TORC1 directly downregulates AMPK signalling by phosphorylating the evolutionarily conserved residue S367 in the fission yeast AMPK catalytic subunit Ssp2 and AMPK α1 S347 and α2 S345 in the mammalian homologs, which is associated with reduced phosphorylation of activation loop T172. Genetic or pharmacological inhibition of TORC1 signalling led to AMPK activation in the absence of increased AMP/ATP ratios, which under nutrient stress conditions was associated with growth limitation in both yeast and human cell cultures. Our findings reveal fundamental bidirectional regulation between two major metabolic signalling networks and uncover new opportunities for cancer treatment strategies aimed at suppressing cell proliferation in the nutrient-poor tumour microenvironment.

Year2020
JournalNature Metabolism
Journal citation2, pp. 41-49
PublisherNature Publishing Group
ISSN2522-5812
Digital Object Identifier (DOI)https://doi.org/10.1038/s42255-019-0157-1
Scopus EID2-s2.0-85078318076
Research or scholarlyResearch
Page range41-49
FunderAustralian Research Council
National Health and Medical Research Council
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All rights reserved
File Access Level
Controlled
Output statusPublished
Publication process dates
Deposited30 Apr 2021
ARC Funded ResearchThis output has been funded, wholly or partially, under the Australian Research Council Act 2001
Grant IDARC/FT130100988
ARC/DP180101682
NHMRC/1143080
NHMRC/1098459
NHMRC/1161262
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