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Experimental autoimmune encephalomyelitis (EAE) is mediated by Th1 and Th17 cells. Invariant NKT (iNKT) cells prevent EAE in an IL-4-, IL-10-, and IFN-γ-dependent manner. However, which of the iNKT cell-produced cytokines regulates the Th1 or Th17 response in EAE remains unclear. Wild-type B6 and Jα18(-/-) mice were immunized with MOG(35-55) peptide to address this issue. Clinical scores for EAE, IL-17, and IFN-γ transcript levels, and IL-17- or IFN-γ-expressing CD4(+) T cell percentages in the CNS and draining lymph nodes were higher in Jα18(-/-) than in B6 mice, but all of these parameters in the CNS were reduced by the adoptive transfer of wild-type or IFN-γ-deficient iNKT cells into the Jα18(-/-) mice before immunization. In contrast, adoptive transfer of IL-4- or IL-10-deficient iNKT cells into Jα18(-/-) mice decreased IL-17 transcript levels and the percentage of IL-17-expressing CD4(+) T cells in the CNS but did not affect clinical scores, IFN-γ transcript levels, or the percentage of IFN-γ-expressing CD4(+) T cells in the CNS. Taken together, IL-4- and IL-10-producing iNKT cells inhibit the Th1 cell response, but not the Th17 cell response, although wild-type iNKT cells suppress both the Th1 and Th17 responses in the CNS during EAE. Moreover, IFN-γ-producing iNKT cells have a minimal role in the regulation of the Th1 and Th17 responses in EAE.

the journal of immunology/the journal of immunology

Invariant NKT Cells Producing IL-4 or IL-10, But Not IFN-γ, Inhibit the Th1 Response in Experimental Autoimmune Encephalomyelitis, Whereas None of These Cells Inhibits the Th17 Response