Cited by 645PI3K/AKT/mTOR signaling in cancerMetabolism, Diabetes, and CancerAutophagy in Disease and Therapy

LKB1 and AMP-activated protein kinase control of mTOR signalling and growth

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Shaw, R. J.·2009·Acta Physiologica

Abstract

The AMP-activated serine/threonine protein kinase (AMPK) is a sensor of cellular energy status found in all eukaryotes that is activated under conditions of low intracellular ATP following stresses such as nutrient deprivation or hypoxia. In the past 5 years, work from a large number of laboratories has revealed that one of the major downstream signalling pathways regulated by AMPK is the mammalian target-of-rapamycin [mammalian target of rapamycin (mTOR) pathway]. Interestingly, like AMPK, the mTOR serine/threonine kinase plays key roles not only in growth control and cell proliferation but also in metabolism. Recent work has revealed that across eukaryotes mTOR orthologues are found in two biochemically distinct complexes and only one of those complexes (mTORC1 in mammals) is acutely sensitive to rapamycin and regulated by nutrients and AMPK. Many details of the molecular mechanism by which AMPK inhibits mTORC1 signalling have also been decoded in the past 5 years. AMPK directly phosphorylates at least two proteins to induce rapid suppression of mTORC1 activity, the TSC2 tumour suppressor and the critical mTORC1 binding subunit raptor. Here we explore the molecular connections between AMPK and mTOR signalling pathways and examine the physiological processes in which AMPK regulation of mTOR is critical for growth or metabolic control. The functional conservation of AMPK and TOR in all eukaryotes, and the sequence conservation around the AMPK phosphorylation sites in raptor across all eukaryotes examined suggest that this represents a fundamental cell growth module connecting nutrient status to the cell growth machinery. These findings have broad implications for the control of cell growth by nutrients in a number of cellular and organismal contexts.

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Crossref · 10.1111/j.1748-1716.2009.01972.x

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  • AMPK mechanistically blocks mTORC1 signaling through direct phosphorylation of the complex as well as through phosphorylation and activation of the TSC1/2 complex, an upstream inhibitor of mTORC1 signaling.

    “AMPK mechanistically blocks mTORC1 signaling through direct phosphorylation of the complex (Shaw, 2009) as well as through the phosphorylation and activation of the hamartin-tuberin (TSC1/2) complex [reviewed in (Shaw, 2009)], which is an upstream inhibitor of mTORC1 signaling.”

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Authors
Shaw, R. J.
Affiliations
Salk Institute for Biological Studies (US)
Corresponding author
Shaw, R. J.
Venue
Acta Physiologica
Publisher
Wiley
Published
2009-04
Volume
196
Issue
1
Pages
65-80
ISSN
  • 1748-1708 (ISSN-L)
  • 1748-1716
OpenAlex
W2011239505
Cited by
644
References
143
Citations by year
2026: 21 · 2025: 29 · 2024: 22 · 2023: 24 · 2022: 42 · 2021: 40 · 2020: 42 · 2019: 50 · 2018: 34 · 2017: 31 · 2016: 44 · 2015: 47 · 2014: 41 · 2013: 42 · 2012: 55
FWCI
3.37
Type
journal article
Language
en
Open access
Locations
  • Acta Physiologica (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (P01CA120964)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK080425)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
LKB1, AMPK, mTOR signaling, mTORC1, raptors, TSC2, cell growth regulation, nutrient sensing, energy status, protein phosphorylation, rapamycin sensitivity, cell proliferation, metabolism
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Regulatory-Associated Protein of mTOR, Tuberous Sclerosis Complex 2 Protein, AMP-Activated Protein Kinase Kinases, Aging, Animals, Antibiotics, Antineoplastic, Autophagy, Clinical Trials as Topic, Energy Metabolism, Humans, Neoplasms, Proteins, Transcription Factors, Signal Transduction, Protein Serine-Threonine Kinases, Sirolimus, Tumor Suppressor Proteins, Multiprotein Complexes, Intracellular Signaling Peptides and Proteins, Adaptor Proteins, Signal Transducing, AMP-Activated Protein Kinases, TOR Serine-Threonine Kinases

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