Cited by 76Immune cells in cancerT-cell and B-cell ImmunologyPI3K/AKT/mTOR signaling in cancer

T cells encountering myeloid cells programmed for amino acid-dependent immunosuppression use Rictor/mTORC2 protein for proliferative checkpoint decisions

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Van de Velde, Lee-Ann, Subramanian, Chitra, Smith, Amber M., Barron, Luke, Qualls, Joseph E., Neale, Geoffrey, Alfonso-Pecchio, Adolfo, Jackowski, Suzanne +3 more·2017·Journal of Biological Chemistry

Abstract

Modulation of T cell proliferation and function by immunoregulatory myeloid cells are an essential means of preventing self-reactivity and restoring tissue homeostasis. Consumption of amino acids such as arginine and tryptophan by immunoregulatory macrophages is one pathway that suppresses local T cell proliferation. Using a reduced complexity in vitro macrophage-T cell co-culture system, we show that macrophage arginase-1 is the only factor required by M2 macrophages to block T cells in G 1 , and this effect is mediated by l-arginine elimination rather than metabolite generation. Tracking how T cells adjust their metabolism when deprived of arginine revealed the significance of macrophage-mediated arginine deprivation to T cells. We found mTORC1 activity was unaffected in the initial G 1 block. After 2 days of arginine deprivation, mTORC1 activity declined paralleling a selective down-regulation of SREBP target gene expression, whereas mRNAs involved in glycolysis, gluconeogenesis, and T cell activation were unaffected. Cell cycle arrest was reversible at any point by exogenous arginine, suggesting starved T cells remain poised awaiting nutrients. Arginine deprivation-induced cell cycle arrest was mediated in part by Rictor/mTORC2, providing evidence that this nutrient recognition pathway is a central component of how T cells measure environmental arginine.

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Crossref · 10.1074/jbc.m116.766238

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    From Pancreatic cancer: Advances and challenges (2023) · cites this paper as [260]

  • TAM programming is mediated by oncogenic KRAS reprogramming of PDAC cells.

    “The programming of TAMs is mediated by oncogenic-KRAS reprogramming of PDAC cells.”

    From Pancreatic cancer: Advances and challenges (2023) · cites this paper as [260]

  • TAM polarization occurs through a PI3K-AKT pathway that activates ACLY signaling and expression of the arginine catabolic enzyme Arg1.

    “The polarization of TAMs occurs through a PI3K-AKT pathway, activating ACLY signaling and the expression of the arginine catabolic enzyme Arginase 1 (Arg1).”

    From Pancreatic cancer: Advances and challenges (2023) · cites this paper as [260]

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Authors
Van de Velde, L.-A., Subramanian, C., Smith, A. M., Barron, L., Qualls, J. E., Neale, G., Alfonso-Pecchio, A., Jackowski, S., Rock, C. O., Wynn, T. A., & Murray, P. J.
Affiliations
  • St. Jude Children's Research Hospital (US)
  • National Institutes of Health (US)
Corresponding author
Murray, Peter J.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2017-01
Volume
292
Issue
1
Pages
15-30
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2558185744
Cited by
75
References
61
Citations by year
2026: 6 · 2025: 9 · 2024: 5 · 2023: 10 · 2022: 6 · 2021: 8 · 2020: 9 · 2019: 6 · 2018: 6 · 2017: 9
FWCI
4.25
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (AI062921, CA138064, CA21765)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
T cell proliferation, immunosuppression, M2 macrophages, arginine deprivation, arginase-1, mTORC1, amino acid sensing, cell cycle arrest, T cell metabolism
MeSH terms
Mechanistic Target of Rapamycin Complex 2, Rapamycin-Insensitive Companion of mTOR Protein, Animals, Arginine, Carrier Proteins, Cells, Cultured, Immune Tolerance, Immunosuppression Therapy, Lymphocyte Activation, Mice, Inbred BALB C, Mice, Inbred C57BL, T-Lymphocytes, Mice, Knockout, Coculture Techniques, Myeloid Cells, Multiprotein Complexes, Cell Proliferation, Proto-Oncogene Proteins c-akt, TOR Serine-Threonine Kinases, Cell Cycle Checkpoints

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