Cited by 206TGF-β signaling in diseasesCellular Mechanics and InteractionsWound Healing and Treatments

Extracellular matrix directs phenotypic heterogeneity of activated fibroblasts

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Avery, Diana, Govindaraju, Priya, Jacob, Michele, Todd, Leslie, Monslow, James, Puré, Ellen·2018·Matrix Biology

Abstract

Activated fibroblasts are key players in the injury response, tumorigenesis, fibrosis, and inflammation. Dichotomous outcomes in response to varied stroma-targeted therapies in cancer emphasize the need to disentangle the roles of heterogeneous fibroblast subsets in physiological and pathophysiological settings. In wound healing, fibrosis, and myriad tumor types, fibroblast activation protein (FAP) and alpha-smooth muscle actin (αSMA) identify distinct, yet overlapping, activated fibroblast subsets. Prior studies established that FAP Hi reactive fibroblasts and αSMA Hi myofibroblasts can exert opposing influences in tumorigenesis. However, the factors that drive this phenotypic heterogeneity and the unique functional roles of these subsets have not been defined. We demonstrate that a convergence of ECM composition, elasticity, and transforming growth factor beta (TGF-β) signaling governs activated fibroblast phenotypic heterogeneity. Furthermore, FAP Hi reactive fibroblasts and αSMA Hi myofibroblasts exhibited distinct gene expression signatures and functionality in vitro, illuminating potentially unique roles of activated fibroblast subsets in tissue remodeling. These insights into activated fibroblast heterogeneity will inform the rational design of stroma-targeted therapies for cancer and fibrosis.

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Crossref · 10.1016/j.matbio.2017.12.003

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  • Physical changes in the ECM are capable of activating CAFs.

    “Physical changes in the ECM are also capable of activating CAFs53,61–64.”

    From A framework for advancing our understanding of cancer-associated fibroblasts (2020) · cites this paper as [64]

    The Results (§1.2.2; page unavailable) show that changing substrate stiffness shifts cultured fibroblasts between activated phenotypes. The Discussion (§1.3; page unavailable) suggests similar regulation likely occurs in tumors, but the study does not directly show that physical ECM changes activate cancer-associated fibroblasts in tumors. (LLM, conf=0.83)

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  • The αSMA-high, matrix-producing-high state is reversible, supported by the responsiveness of matrix production and the αSMA promoter to extracellular cues including substrate stiffness.

    “the responsiveness of matrix production by fibroblasts and the αSMA promoter to a range of extracellular cues, including substrate stiffness, supports the idea that the αSMA-high, matrix producing-high state is reversible63,64,137–139.”

    From A framework for advancing our understanding of cancer-associated fibroblasts (2020) · cites this paper as [64]

    Results §1.2.3 shows that fibroblast morphology and αSMA-enriched populations change when cells are moved between soft and stiff substrates, supporting phenotypic reversibility. Results §1.2.6 links matrix-component expression to substrate-associated fibroblast subsets, but finds greater ECM synthesis in FAP-high cells than in αSMA-high cells. The paper does not demonstrate responsiveness of the αSMA promoter or reversibility of a specifically αSMA-high, matrix-producing-high state. (LLM, conf=0.88)

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Authors
Avery, D., Govindaraju, P., Jacob, M., Todd, L., Monslow, J., & Puré, E.
Affiliations
University of Pennsylvania (US)
Corresponding author
Puré, Ellen
Venue
Matrix Biology
Publisher
Elsevier BV
Published
2018-04
Volume
67
Pages
90-106
ISSN
0945-053X (ISSN-L)
OpenAlex
W2774304513
Cited by
206
References
97
Citations by year
2026: 19 · 2025: 22 · 2024: 22 · 2023: 29 · 2022: 34 · 2021: 27 · 2020: 34 · 2019: 10 · 2018: 8
FWCI
5.81
Type
journal article
Language
en
Open access
Locations
  • Matrix Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Health (R01CA141144, R21CA169741, R01CA172921)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Health Sciences › Medicine › Rehabilitation › Wound Healing and Treatments
Keywords
activated fibroblasts, phenotypic heterogeneity, extracellular matrix, fibroblast activation protein, alpha-smooth muscle actin, myofibroblasts, TGF-beta signaling, matrix elasticity, stroma-targeted therapy, tumor microenvironment, fibrosis, tissue remodeling, gene expression signatures
MeSH terms
Fibroblast Activation Protein Alpha, Actins, Animals, Cell Differentiation, Cells, Cultured, Extracellular Matrix, Fibroblasts, Membrane Proteins, Endopeptidases, Phenotype, Serine Endopeptidases, Signal Transduction, Transforming Growth Factor beta, Gelatinases, Mice, Myofibroblasts

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