Abstract
Substantial evidence indicates that cancer-associated fibroblasts (CAFs) are critical components in the process of cancer progression. However, the role of CAFs in the immunopathogenesis of human cancer remains elusive. In this study, we demonstrate that purified colorectal carcinoma-derived fibroblasts exhibit activated phenotypes characterized by substantial α-smooth muscle actin expression. These CAFs sharply suppress natural killer (NK) cell functions in co-culture experiments. In contrast, normal skin fibroblasts had only a minimal effect on NK cell phenotype and function. Moreover, we demonstrated that prostaglandin E2 (PGE2) was released by fibroblasts in co-culture experiments. Thus, the functional modulation of NK cells by CAFs may represent a novel mechanism linking the pro-inflammatory response to immune tolerance within the tumor milieu.
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Abbreviations
- CAFs:
-
Cancer-associated fibroblasts
- NK cell:
-
Natural killer cell
- PGE2:
-
Prostaglandin E2
- PI:
-
Propidium iodide
- FSP:
-
Fibroblast surface protein
- LAC:
-
Leukocyte activation cocktail
- HFs:
-
Healthy donor fibroblasts
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Acknowledgments
This work was supported by State 973 National Basic Research Program of China (2009CB522404), Program for New Century Excellent Talents in University (NCET-08-0583), National Natural Science Foundation of China (NSFC-30972914), State Key Projects on Infection Diseases of China (2008ZX10002-025, 026), Training Program Foundation for Innovative Talents by Sun Yat-sen University (82000-3126202).
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Tuanjie Li and Shuhong Yi have contributed equally to this work.
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12032_2013_663_MOESM1_ESM.tif
Figure S1. CAFs modulate the phenotype of NK cells. NK cells were cultured in IL-2 either alone or with the indicated fibroblast cell lines, Then, the phenotypes were analyzed by FACS. The results shown are representative of six separate experiments; the numbers indicate the percentages of positive cells. (TIFF 1911 kb)
12032_2013_663_MOESM2_ESM.tif
Figure S2. Intracytoplasmic analysis of the expression of granzyme B, perforin, and Ki67. NK cells derived from a representative donor were co-cultured with different fibroblasts and analyzed at Day five. The numbers indicate the percentages of positive cells. (TIFF 1346 kb)
12032_2013_663_MOESM3_ESM.tif
Figure S3. Impaired cytokine secretion of NK cells after co-culture with CAFs. NK cells cultured alone or in the presence of CAFs for five days were stimulated with LAC. Numbers indicate the percentages of TNF-α- and IFN-γ-positive cells. The results shown are representative of six separate experiments. (TIFF 374 kb)
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Li, T., Yi, S., Liu, W. et al. Colorectal carcinoma-derived fibroblasts modulate natural killer cell phenotype and antitumor cytotoxicity. Med Oncol 30, 663 (2013). https://doi.org/10.1007/s12032-013-0663-z
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DOI: https://doi.org/10.1007/s12032-013-0663-z