Abstract
Cancer-associated fibroblasts (CAFs) have been shown to play an important role in angiogenesis, invasion, and metastasis. In the present study, we determined whether CAFs within the tumor microenvironment (TME) in head and neck squamous cell carcinoma (HNSCC) contributed to promoting immunosuppression and evasion from immune surveillance. Six pairs of CAFs and normal fibroblasts (NFs) were established from the resected tumor tissues of patients with HNSCC. The effects of CAFs and NFs on the functions of T cells were comparatively analyzed. CAFs expressed the co-regulatory molecules, B7H1 and B7DC, whereas NFs did not. The expression levels of cytokine genes, including those for IL6, CXCL8, TNF, TGFB1, and VEGFA, were higher in CAFs. T cell proliferation was suppressed more by CAFs or their supernatants than by NFs. Moreover, PBMCs co-cultured with the supernatants of CAFs preferentially induced T cell apoptosis and regulatory T cells over those co-cultured with the supernatants of NFs. A microarray analysis revealed that the level of genes related to the leukocyte extravasation and paxillin signaling pathways was higher in CAFs than in NFs. These results demonstrated that CAFs collaborated with tumor cells in the TME to establish an immunosuppressive network that facilitated tumor evasion from immunological destruction.
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Abbreviations
- 7-ADD:
-
7-Amino-actinomycin D
- APC:
-
Allophycocyanin
- CAF:
-
Cancer-associated fibroblast
- CCL7:
-
Chemokine ligand 7
- CFSE:
-
Carboxyfluorescein succinimidyl ester
- Cy:
-
Cyanine
- FAP:
-
Fibroblast activation protein
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- HGF:
-
Hepatocyte growth factor
- HNSCC:
-
Head and neck squamous cell carcinoma
- IGF:
-
Insulin-like growth factor
- IL:
-
Interleukin
- IPA:
-
Ingenuity pathway analysis
- MMP:
-
Matrix metalloproteinase
- NF:
-
Normal fibroblast
- NSCLC:
-
Non-small cell lung cancer
- SMA:
-
Smooth muscle actin
- TGF:
-
Transforming growth factor
- TME:
-
Tumor microenvironment
- Treg:
-
Regulatory T cells
- VEGF:
-
Vascular endothelial growth factor
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Acknowledgments
This work was supported in part by KAKENHI (Grants-in-Aid for Scientific Research) (15K10798 to Koichi Sakakura, 25861525 to Minoru Toyoda, 26670736 to Kazuaki Chikamatsu). We thank Dr. Theresa L. Whiteside for her critical reading and comments.
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Takahashi, H., Sakakura, K., Kawabata-Iwakawa, R. et al. Immunosuppressive activity of cancer-associated fibroblasts in head and neck squamous cell carcinoma. Cancer Immunol Immunother 64, 1407–1417 (2015). https://doi.org/10.1007/s00262-015-1742-0
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DOI: https://doi.org/10.1007/s00262-015-1742-0