Bidirectional Transport of Amino Acids Regulates mTOR and Autophagy
Open accessAbstract
Amino acids are required for activation of the mammalian target of rapamycin (mTOR) kinase which regulates protein translation, cell growth, and autophagy. Cell surface transporters that allow amino acids to enter the cell and signal to mTOR are unknown. We show that cellular uptake of L-glutamine and its subsequent rapid efflux in the presence of essential amino acids (EAA) is the rate-limiting step that activates mTOR. L-glutamine uptake is regulated by SLC1A5 and loss of SLC1A5 function inhibits cell growth and activates autophagy. The molecular basis for L-glutamine sensitivity is due to SLC7A5/SLC3A2, a bidirectional transporter that regulates the simultaneous efflux of L-glutamine out of cells and transport of L-leucine/EAA into cells. Certain tumor cell lines with high basal cellular levels of L-glutamine bypass the need for L-glutamine uptake and are primed for mTOR activation. Thus, L-glutamine flux regulates mTOR, translation and autophagy to coordinate cell growth and proliferation.
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Cellular uptake of glutamine and its subsequent efflux in the presence of essential amino acids is the rate-determining step for mTORC1 activation.
“It has been reported that cellular uptake of glutamine and its subsequent efflux in the presence of essential amino acids, including leucine, is the rate-determining step that activates mTORC1191.”
From Glutamine reliance in cell metabolism (2020) · cites this paper as [191]
Import of leucine through LAT1 is coupled to simultaneous efflux of glutamine.
“the import of an essential amino acid leucine through the plasma membrane-localized neutral amino acid antiporter LAT1 was shown to be coupled to a simultaneous efflux of glutamine”
From The emerging hallmarks of cancer metabolism (2016) · cites this paper as Nicklin et al., 2009
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- Authors
- Nicklin, P., Bergman, P., Zhang, B., Triantafellow, E., Wang, H., Nyfeler, B., Yang, H., Hild, M., Kung, C., Wilson, C., Myer, V. E., MacKeigan, J. P., Porter, J. A., Wang, Y. K., Cantley, L. C., Finan, P. M., & Murphy, L. O.
- Affiliations
- Beth Israel Deaconess Medical Center (US)
- Corresponding author
- Murphy, Leon O.
- ORCID
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2009-02
- Volume
- 136
- Issue
- 3
- Pages
- 521-534
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC3733119
- OpenAlex
- W2169903226
- Cited by
- 1,798
- References
- 59
- Citations by year
- 2026: 89 · 2025: 106 · 2024: 89 · 2023: 92 · 2022: 129 · 2021: 141 · 2020: 130 · 2019: 116 · 2018: 109 · 2017: 107 · 2016: 118 · 2015: 127 · 2014: 120 · 2013: 95 · 2012: 90
- FWCI
- 40.12
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- University of Hertfordshire Research Archive (University of Hertfordshire) (acceptedVersion)
- University of Hertfordshire Research Archive (University of Hertfordshire) (submittedVersion)
- Funders
- National Institute of General Medical Sciences (R01GM041890)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
- Keywords
- mTOR activation, autophagy, amino acid transport, SLC1A5, leucine, essential amino acids, mRNA translation, cell growth, cancer cells
- MeSH terms
- Mechanistic Target of Rapamycin Complex 1, Animals, Autophagy, Drosophila melanogaster, Glutamine, Humans, Leucine, Protein Kinases, Proteins, Transcription Factors, Amino Acid Transport System ASC, Cell Line, Tumor, Multiprotein Complexes, TOR Serine-Threonine Kinases
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