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Neuroimmunology Research R&D-31, Portland Veterans Affairs Medical Center, and Departments of
Neurology,
Biochemistry and Molecular Biology, and
§
Molecular Microbiology and Immunology, Oregon Health Sciences University, Portland, OR 97201
TCR determinants overexpressed by autopathogenic Th1 cells can
naturally induce a second set of TCR-specific regulatory T cells. We
addressed the question of whether immune regulation could be induced
naturally in a genetically restricted model in which a major portion of
TCR-specific regulatory T cells expressed the same target TCR BV8S2
chain as the pathogenic T cells specific for myelin basic protein
(MBP). We found vigorous T cell responses to BV8S2 determinants in
naive mice that could be further potentiated by vaccination with
heterologous BV8S2 proteins, resulting in the selective inhibition of
MBP-specific Th1 cells and protection against experimental
encephalomyelitis. Moreover, coculture with BV8S2-specific T cells or
their supernatants reduced proliferation, IFN-
secretion, and
encephalitogenic activity of MBP-specific T cells. These results
suggest that immune regulation occurs through a nondeletional
cytokine-driven suppressive mechanism.
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