Journal
JOURNAL OF IMMUNOLOGY
Volume 184, Issue 5, Pages 2281-2288Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.0902574
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Funding
- National Institute of Arthritis and Musculoskeletal [AR46256]
- Skin Diseases and National Institute of Allergy and Infectious Diseases [AI071041]
- National Center for Research Resources, National Institutes of Health [C06 RR 15490]
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The role of immune responses in tumor development is a central issue for tumor biology and immunology. IL-17 is an important cytokine for inflammatory and autoimmune diseases. Although IL-17-producing cells are detected in cancer patients and tumor-bearing mice, the role of IL-17 in tumor development is controversial, and mechanisms remain to be fully elucidated. In the current study, we found that the development of tumors was inhibited in IL-17R-deficient mice. A defect in IFN-gamma R increased tumor growth, whereas tumor growth was inhibited in mice that were deficient in both IL-17R and IFN-gamma R compared with wild-type animals. Further experiments showed that neutralization of IL-17 by Abs inhibited tumor growth in wild-type mice, whereas systemic administration of IL-17 promoted tumor growth. The IL-17R deficiency increased CD8 T cell infiltration, whereas it reduced the infiltration of myeloid-derived suppressor cells (MDSCs) in tumors. In contrast, administration of IL-17 inhibited CD8 T cell infiltration and increased MDSCs in tumors. Further analysis indicated that IL-17 was required for the development and tumor-promoting activity of MDSCs in tumor-bearing mice. These data demonstrate that IL-17-mediated responses promote tumor development through the induction of tumor-promoting microenvironments at tumor sites. IL-17-mediated regulation of MDSCs is a primary mechanism for its tumor-promoting effects. The study provides novel insights into the role of IL-17 in tumor development and has major implications for targeting IL-17 in treatment of tumors. The Journal of Immunology,20109184:2281-2288.
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