Abstract
Tumor-associated fibrosis is characterized by unchecked pro-fibrotic and pro-inflammatory signaling. The components of fibrosis including significant numbers of cancer-associated fibroblasts, dense collagen deposition, and extracellular matrix stiffness, are well appreciated regulators of tumor progression but may also be critical regulators of immune surveillance. While this suggests that the efficacy of immunotherapy may be limited in highly fibrotic cancers like pancreas, it also suggests a therapeutic opportunity to target fibrosis in these tumor types to reawaken anti-tumor immunity. This review discusses the mechanisms by which fibrosis might subvert tumor immunity and how to overcome these mechanisms.
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Abbreviations
- 4-MU:
-
4-Methylumbelliferone
- A2AR:
-
AMP-elevating A2A adenosine receptors
- ATRA:
-
All-trans retinoic acid
- CAFs:
-
Cancer-associated fibroblasts
- CSF-1:
-
Colony-stimulating factor-1
- CTL:
-
Cytotoxic T lymphocyte
- CXCL1:
-
Chemokine (C-X-C motif) ligand 1
- DDR2:
-
Discoidin domain-containing receptor 2
- ECM:
-
Extracellular matrix
- EMT:
-
Epithelial–mesenchymal transition
- FAK:
-
Focal adhesion kinase
- FAP:
-
Fibroblast activation protein
- FSP1:
-
Fibroblast-specific protein 1
- GM-CSF:
-
Granulocyte-macrophage colony stimulating factor
- HA:
-
Hyaluronic acid
- IDO:
-
Indoleamine 2,3-dioxygenase
- LOX:
-
Lysyl oxidase
- MCP1:
-
Monocyte chemotactic protein-1
- MDSCs:
-
Myeloid derived suppressive cells
- MSCs:
-
Mesenchymal stem cells
- PD-L1:
-
Programmed death-ligand 1
- PDAC:
-
Pancreatic ductal adenocarcinoma
- PDGF:
-
Platelet-derived growth factor
- PEGPH20:
-
PEG-fused hyaluronidase
- PGE2:
-
Prostaglandin E2
- PSCs:
-
Pancreatic stellate cells
- ROCK:
-
Rho-associated protein kinase
- SDF-1:
-
Stromal cell-derived factor 1
- SHH:
-
Sonic hedgehog
- SMA:
-
Smooth muscle actin
- STAT3:
-
Signal transducer and activator of transcription 3
- TAMs:
-
Tumor-associated macrophages
- TGF-β:
-
Transforming growth factor beta
- TME:
-
Tumor microenvironment
- Treg :
-
Regulatory T cells
- TSLP:
-
Thymic stromal lymphopoietin
- TuDCs:
-
Tumor-infiltrating DCs
- VDR:
-
Vitamin D receptor
- YAP1:
-
Yes-associated protein 1
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The Authors acknowledges support from the Pancreatic Cancer Action Network and the American Association for Cancer Research (AACR/PANCAN Award), the National Cancer Institute (NCI awards R01-CA177670, R01-CA203890, P50-CA196510, P30-CA91842) and the BJCIH/Siteman Cancer Center Cancer Frontier Fund.
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The authors declare that there is no conflict of interest.
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This paper is a Focussed Research Review based on a presentation given at the conference Regulatory Myeloid Suppressor Cells: From Basic Discovery to Therapeutic Application which was hosted by the Wistar Institute in Philadelphia, PA, USA, 16th – 19th June, 2016. It is part of a Cancer Immunology, Immunotherapy series of Focussed Research Reviews.
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Jiang, H., Hegde, S. & DeNardo, D.G. Tumor-associated fibrosis as a regulator of tumor immunity and response to immunotherapy. Cancer Immunol Immunother 66, 1037–1048 (2017). https://doi.org/10.1007/s00262-017-2003-1
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DOI: https://doi.org/10.1007/s00262-017-2003-1