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The Journal of Immunology, 1999, 162: 5561-5568.
Copyright © 1999 by The American Association of Immunologists

Decreased IL-12 Production Underlies the Decreased Ability of Male Lymph Node Cells to Induce Experimental Autoimmune Encephalomyelitis1

Sookhyun Kim and Rhonda R. Voskuhl2

Multiple Sclerosis Center, Department of Neurology, University of California, Los Angeles, CA 90095

Myelin basic protein (MBP)-specific T lymphocytes from male SJL mice were shown to be less encephalitogenic than MBP-specific T lymphocytes from females. Mechanisms underlying this gender difference in the induction phase of EAE were examined. Following immunization with MBP, draining lymph nodes contained fewer cells, and Ag-specific proliferative responses were decreased in males as compared with females. These gender differences in the proliferative response were not unique to MBP-specific responses since they were also observed after immunization with hen eggwhite lysozyme. Short-term MBP-specific T cell lines derived from females and males mapped with identical specificity, indicating no defect in the ability of male APCs to process Ag. Interestingly, IL-12 and IFN-{gamma} production was decreased following Ag-specific stimulation of draining lymph node cells (LNC) from males as compared with females, but IL-10 and IL-4 were no different. While male-derived LNCs were less encephalitogenic than female derived LNCs, cotransfer and coculture of male LNCs with female LNCs demonstrated that male LNCs were not immunosuppressive. Administration of IL-12 to LNCs from male mice enhanced encephalitogenicity. These data indicate that deficient endogenous IL-12 production within draining LNCs of male SJL mice is central to gender differences in the induction phase of experimental autoimmune encephalomyelitis.




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