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Nutrient signaling to mTOR and cell growth
Jenna L Jewell1, Kun-Liang Guan
1Department of Pharmacology and Moores Cancer Center, University of California at San Diego, La Jolla, CA 92093, USA.
Trends in Biochemical Sciences
|March 8, 2013
Summary
The mammalian target of rapamycin (mTOR) pathway regulates cell growth and is often hyperactivated in cancers. This review details nutrient-driven mTORC1 activation, a critical but poorly understood process.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Oncology
Background:
- The mammalian target of rapamycin (mTOR) is a key protein kinase regulating cellular processes like growth.
- Aberrant mTOR activation is implicated in human cancers, with mTOR inhibitors showing clinical efficacy.
- mTOR exists in two complexes, mTORC1 and mTORC2, with differential regulation by growth factors and nutrients.
Purpose of the Study:
- To review the current understanding of nutrient-dependent regulation of mTORC1.
- To elucidate the molecular mechanisms underlying amino acid-induced mTORC1 activation.
Main Methods:
- Literature review of existing studies on mTORC1 regulation.
- Analysis of molecular pathways involved in nutrient sensing and mTORC1 activation.
Main Results:
- mTORC1, but not mTORC2, is sensitive to nutrient availability, including glucose and amino acids.
- Despite its importance, the precise mechanisms of amino acid-induced mTORC1 activation remain incompletely understood.
Conclusions:
- Understanding nutrient regulation of mTORC1 is crucial given its role in cell growth and cancer.
- Further research is needed to fully unravel the complexities of amino acid signaling to mTORC1.
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