Cited by 116TGF-β signaling in diseasesCell Adhesion Molecules ResearchCancer Immunotherapy and Biomarkers

Integrin-Mediated TGFβ Activation Modulates the Tumour Microenvironment

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Brown, Nicholas F., Marshall, John F.·2019·Cancers

Abstract

TGFβ (transforming growth factor-beta) is a pleotropic cytokine with contrasting effects in cancer. In normal tissue and early tumours, TGFβ acts as a tumour suppressor, limiting proliferation and inducing apoptosis. However, these effects are eventually abrogated by the loss or inactivation of downstream signalling within the TGFβ pathway, and in established tumours, TGFβ then acts as a tumour promotor through multiple mechanisms including inducing epithelial-to-mesenchymal transition (EMT), promoting formation of cancer-associated fibroblasts (CAFs) and increasing angiogenesis. TGFβ is secrereted as a large latent complex and is embedded in the extracellular matrix or held on the surface of cells and must be activated before mediating its multiple functions. Thus, whilst TGFβ is abundant in the tumour microenvironment (TME), its functionality is regulated by local activation. The αv-integrins are major activators of latent-TGFβ. The potential benefits of manipulating the immune TME have been highlighted by the clinical success of immune-checkpoint inhibitors in a number of solid tumour types. TGFβ is a potent suppressor of T-cell-mediated immune surveillance and a key cause of resistance to checkpoint inhibitors. Therefore, as certain integrins locally activate TGFβ, they are likely to have a role in the immunosuppressive TME, although this remains to be confirmed. In this review, we discussed the role of TGFβ in cancer, the role of integrins in activating TGFβ in the TME, and the potential benefits of targeting integrins to augment immunotherapies.

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Crossref · 10.3390/cancers11091221

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  • Atf4 expression is enriched in hepatic Tregs from Western diet-induced obese mice, where it contributes to liver fibrosis by promoting TGF-β activation through integrin αvβ8.

    “A recent report further demonstrated that Atf4 expression is enriched in hepatic Tregs from Western diet-induced obese mice, where it contributes to liver fibrosis by promoting TGF-β activation through integrin αvβ8.”

    From The double-edged sword of regulatory T cells in MASLD: from inflammation control to fibrosis promotion (2026) · cites this paper as Brown and Marshall 2019

    Section 5.5 (Immunomodulation; page unavailable) states that Tregs activate TGF-β through integrin αvβ8. The paper does not report Atf4 enrichment in hepatic Tregs from Western diet-induced obese mice or show that this pathway contributes to liver fibrosis; its fibrosis discussion in section 3.6 concerns hepatic stellate cells and a different experimental condition. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • αvβ1, αvβ6 and αvβ8 mediate TGF-β1 activation.

    “Since αvβ1, αvβ6 and αvβ8 mediate TGF-β1 activation81”

    From TGFβ biology in cancer progression and immunotherapy (2021) · cites this paper as [81]

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Authors
Brown, N. F., & Marshall, J. F.
Affiliations
Queen Mary University of London (GB)
Corresponding author
Marshall, John F.
Venue
Cancers
Publisher
MDPI AG
Published
2019-08-21
Volume
11
Issue
9
Pages
1221
ISSN
2072-6694 (ISSN-L)
OpenAlex
W2969253527
Cited by
116
References
192
Citations by year
2026: 13 · 2025: 17 · 2024: 18 · 2023: 11 · 2022: 16 · 2021: 23 · 2020: 16 · 2019: 2
FWCI
1.26
Type
journal article
Language
en
Open access
Locations
  • Cancers (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Queen Mary Research Online (Queen Mary University of London) (submittedVersion, cc-by)
Funders
Cancer Research UK (S_3565)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
Keywords
integrins, ITGAV, tumor microenvironment, TGF-beta signaling, immunosuppression, immune checkpoint inhibitors, cancer-associated fibroblasts, epithelial-mesenchymal transition, angiogenesis

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