Cited by 378PI3K/AKT/mTOR signaling in cancerImmune cells in cancerProtein Kinase Regulation and GTPase Signaling

Receptor Tyrosine Kinases and TLR/IL1Rs Unexpectedly Activate Myeloid Cell PI3Kγ, A Single Convergent Point Promoting Tumor Inflammation and Progression

Open access
Schmid, Michael C., Avraamides, Christie J., Dippold, Holly C., Franco, Irene, Foubert, Philippe, Ellies, Lesley G., Acevedo, Lissette M., Manglicmot, Joan R.E. +8 more·2011·Cancer Cell

Abstract

Tumor inflammation promotes angiogenesis, immunosuppression, and tumor growth, but the mechanisms controlling inflammatory cell recruitment to tumors are not well understood. We found that a range of chemoattractants activating G protein-coupled receptors (GPCRs), receptor tyrosine kinases (RTKs) and Toll-like/IL-1 receptors (TLR/IL1Rs) unexpectedly initiate tumor inflammation by activating the PI3-kinase isoform p110γ in Gr1+CD11b+ myeloid cells. Whereas GPCRs activate p110γ in a Ras/p101-dependent manner, RTKs and TLR/IL1Rs directly activate p110γ in a Ras/p87-dependent manner. Once activated, p110γ promotes inside-out activation of a single integrin, α4β1, causing myeloid cell invasion into tumors. Pharmacological or genetic blockade of p110γ suppressed inflammation, growth, and metastasis of implanted and spontaneous tumors, revealing an important therapeutic target in oncology.

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Registry

Crossref · 10.1016/j.ccr.2011.04.016

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  • α4β1/αvβ3 integrins are expressed in hematopoietic and endothelial cells and play a key role in inflammation.

    “The α4β1/αvβ3 integrins are expressed in hematopoietic and endothelial cells [14] and play a key role in inflammation [15], [29], [46], [47].”

    From Rac2 Controls Tumor Growth, Metastasis and M1-M2 Macrophage Differentiation In Vivo (2014) · cites this paper as [29]

    The Introduction states that integrins play key roles in inflammation, and the Results identify α4β1 as important for myeloid-cell trafficking to tumors. The paper does not establish the same inflammatory role for αvβ3; in the Results, inhibiting αvβ3 had no effect on the myeloid-cell adhesion tested. The expression claim has a separate citation in the citing sentence. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • α4β1 is involved in tumor progression involving the TLR4 signaling pathway and p110γ axis.

    “Other investigators have shown that α4β1 is involved in tumor progression involving the TLR4 signaling pathway and p110γ axis.”

    From Rac2 Controls Tumor Growth, Metastasis and M1-M2 Macrophage Differentiation In Vivo (2014) · cites this paper as [29]

    The Discussion states that TLR/IL1R signaling activates p110γ, which promotes α4β1 activation and tumor progression; the Results also link p110γ-mediated α4β1 activation to tumor growth. Our copy does not identify TLR4 specifically, so the claim's narrower receptor attribution is not established. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • α4Y991A knock-in mice display a defect in macrophage entry into the tumor microenvironment, whereas Rac2-/- mice do not.

    “As expected, our data demonstrate that the phenotype of the α4Y991A knock-in differs significantly from the Rac2 -/- mice in that α4Y991A knock-in mice as reported by Schmidt et al [29] display a defect in Mθ entry into the TME whereas no such defect is noted in Rac2-/- mice.”

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Research works printed but not linked: 1

  1. Zhang X Shephard F Kim HB Palmer IR McHarg S Fowler GJ O’Neill LA Kiss-Toth E Qwarnstrom EETIRR 2010 A novel IL1R1 co-receptor potentiates MyD88 recruitment to control Ras-dependent amplification of NF-kB J Biol Chem 285 7222 7232 19940113 PMC2844171

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Authors
Schmid, M. C., Avraamides, C. J., Dippold, H. C., Franco, I., Foubert, P., Ellies, L. G., Acevedo, L. M., Manglicmot, J. R. E., Song, X., Wrasidlo, W., Blair, S. L., Ginsberg, M. H., Cheresh, D. A., Hirsch, E., Field, S. J., & Varner, J. A.
Affiliations
  • University of California San Diego (US)
  • University of Turin (IT)
Corresponding author
Varner, Judith A.
Venue
Cancer Cell
Publisher
Elsevier BV
Published
2011-06
Volume
19
Issue
6
Pages
715-727
ISSN
1535-6108 (ISSN-L)
OpenAlex
W2046905172
Cited by
378
References
49
Citations by year
2026: 6 · 2025: 20 · 2024: 25 · 2023: 18 · 2022: 22 · 2021: 45 · 2020: 31 · 2019: 35 · 2018: 22 · 2017: 25 · 2016: 26 · 2015: 31 · 2014: 18 · 2013: 24 · 2012: 21
FWCI
9.36
Type
journal article
Language
en
Open access
Locations
  • Cancer Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Institutional Research Information System University of Turin (University of Turin) (submittedVersion)
Funders
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • Fondazione Cariplo
  • Novartis
  • National Institutes of Health (AR27214, DP2OD004265, HL31950, R01CA118182, R01CA126820, R01CA138676, R01CA45726, R01CA50286, R01CA83133)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
PI3Kγ, p110γ, tumor inflammation, myeloid cells, receptor tyrosine kinase, Toll-like receptors, IL-1 receptor, G protein-coupled receptors, Ras signaling, alpha4beta1 integrin, myeloid cell recruitment, metastasis, tumor growth, PI3Kγ inhibitor
MeSH terms
Animals, Cell Adhesion, Cell Movement, Humans, Inflammation, Mice, Inbred C57BL, Neoplasm Metastasis, Neoplasms, Receptors, Interleukin-1, Disease Progression, ras Proteins, Receptor Protein-Tyrosine Kinases, Integrin alpha4beta1, Toll-Like Receptors, Mice, Class Ib Phosphatidylinositol 3-Kinase

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