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J. Exp. Med.,
Volume 189, Number 6, March 15, 1999 969-978
2 Subunit
Expression by Endogenous IL-12: A Critical Step in the
Differentiation of Pathogenic Autoreactive T Cells
By
From the Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National
Institutes of Health, Bethesda, Maryland 20892
The interleukin (IL)-12 receptor (R)
2 subunit is the critical molecule involved in maintaining
IL-12 responsiveness and controlling T helper cell type 1 lineage commitment. We demonstrate that IL-12 and interferon (IFN)-
play separate, but complementary, roles in regulating
IL-12R
2 expression on antigen-specific CD4+ T cells. These results are consistent with our
previous observation that IL-12 can promote autoimmune disease through IFN-
-independent as well as -dependent pathways. Therefore, we compared the induction of IL-12 by, and
the expression of the IL-12R
2 subunit on, myelin basic protein (MBP)-specific T cells from
experimental allergic encephalomyelitis (EAE)-susceptible SJL (H-2s) mice and from EAE-
resistant B10.S mice (H-2s). B10.S mice had an antigen-specific defect in their capacity to upregulate the IL-12R
2 subunit. Defective expression was not secondary to the production of suppressive cytokines, but to a failure of B10.S MBP-specific T cells to upregulate CD40 ligand expression and to induce the production of IL-12. IL-12R
2 expression as well as encephalitogenicity of these cells could be restored by the addition of IL-12. These results suggest that the
development of immunotherapies that target the IL-12R
2 subunit may be useful for the
treatment of autoimmune diseases.
;
CD40 ligand
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