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J. Exp. Med., Volume 189, Number 6, March 15, 1999 1005-1010

Transgenic Interleukin 10 Prevents Induction of Experimental Autoimmune Encephalomyelitis

By Daniel J. Cua,* Herve Groux,Dagger David R. Hinton,parallel Stephen A. Stohlman,§ and Robert L. Coffman*

From the * DNAX Research Institute of Molecular and Cellular Biology, Inc., Palo Alto, California 94304; Dagger  Institut National de la Santé et de la Recherche Médicale, U343 Hopital de I'Archet, 06200 Nice, France; and the Department of § Molecular Microbiology and Immunology, the parallel   Department of Pathology, and the  Department of Neurology, University of Southern California at Los Angeles School of Medicine, Los Angeles, California 90033

The effectiveness of interleukin 10 (IL-10) in the treatment of autoimmune-mediated central nervous system inflammation is controversial. Studies of the model system, experimental autoimmune encephalomyelitis (EAE), using various routes, regimens, and delivery methods of IL-10 suggest that these variables may affect its immunoregulatory function. To study the influence of these factors on IL-10 regulation of EAE pathogenesis, we have analyzed transgenic mice expressing human IL-10 (hIL-10) transgene under the control of a class II major histocompatibility complex (MHC) promoter. The hIL-10 transgenic mice are highly resistant to EAE induced by active immunization, and this resistance appears to be mediated by suppression of autoreactive T cell function. Myelin-reactive T helper 1 cells are induced but nonpathogenic in the IL-10 transgenic mice. Antibody depletion confirmed that EAE resistance is dependent on the presence of the transgenic IL-10. Mice expressing the hIL-10 transgene but not the endogenous murine IL-10 gene demonstrated that transgenic IL-10 from MHC class II-expressing cells is sufficient to block induction of EAE. This study demonstrates that IL-10 can prevent EAE completely if present at appropriate levels and times during disease induction.

Key words: major histocompatibility complex class II promoter-regulated interleukin 10;  myelin-reactive T cells;  immune regulation;  autoimmunity


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