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Human T Cells That Are Able to Produce IL-17 Express the Chemokine Receptor CCR6¹

Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892

Some pathways of T cell differentiation are associated with characteristic patterns of chemokine receptor expression. A new lineage of effector/memory CD4⁺ T cells has been identified whose signature products are IL-17 cytokines and whose differentiation requires the nuclear receptor, RORt. These Th17 cells are critical effectors in mouse models of autoimmune disease. We have analyzed the association between chemokine receptor expression and IL-17 production for human T cells. Activating cord blood (naive) CD4⁺ T cells under conditions driving Th17 differentiation led to preferential induction of CCR6, CCR9, and CXCR6. Despite these data, we found no strong correlation between the production of IL-17 and expression of CCR9 or CXCR6. By contrast, our analyses revealed that virtually all IL-17-producing CD4⁺ T cells, either made in our in vitro cultures or found in peripheral blood, expressed CCR6, a receptor found on 50% of CD4⁺ memory PBL. Compared with CD4⁺CD45RO⁺CCR6^– cells, CD4⁺CD45RO⁺CCR6⁺ cells contained at least 100-fold more IL-17A mRNA and secreted 100-fold more IL-17 protein. The CCR6⁺ cells showed a similar enrichment in mRNA for RORt. CCR6 was likewise expressed on all IL-17-producing CD8⁺ PBL. CCR6 has been associated with the trafficking of T, B, and dendritic cells to epithelial sites, but has not been linked to a specific T cell phenotype. Our data reveal a fundamental feature of IL-17-producing human T cells and a novel role for CCR6, suggesting both new directions for investigating IL-17-related immune responses and possible targets for preventing inflammatory injury.

The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ This research was supported by the Intramural Research Program of the National Institutes of Health, National Institute of Allergy and Infectious Diseases.

² Address correspondence and reprint requests to Dr. Joshua M. Farber, Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Building 10, Room 11N-111, 10 Center Drive, Bethesda, MD 20892. E-mail address: jfarber{at}niaid.nih.gov

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