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The Journal of Immunology, Vol 146, Issue 2 515-520, Copyright © 1991 by American Association of Immunologists

ARTICLES

T cell lines specific for an immunodominant epitope of human basic protein define an encephalitogenic determinant for experimental autoimmune encephalomyelitis-resistant LOU/M rats

G Hashim, AA Vandenbark, DP Gold, T Diamanduros and H Offner
Department of Microbiology and Surgery, St. Luke's-Roosevelt Hospital Center, New York, NY.

The LOU/M rat (RT-1w) haplotype, although resistant to an encephalitogenic challenge of guinea pig myelin basic protein (Gp- BP)/CFA and unresponsive to Gp-BP, responded strongly to human (Hu)-BP. Both T cell and antibody responses focused on the 110-129 determinant of Hu-BP, and T cells specific for this epitope transferred clinical and histologic experimental autoimmune encephalomyelitis (EAE) to naive LOU/M rats. Moreover, EAE could be induced actively with Hu-BP and a synthetic Hu-S110-129 peptide in CFA, but only with co-immunomodulation by pertussis toxin or cyclophosphamide. Analysis of TCR V region genes revealed the predominant use of the V beta 8.5-J beta 2.3 gene combination, with extensive N region additions to both D beta 1 and D beta 2. These results define the Hu-BP 110-129 peptide sequence as the major encephalitogenic epitope for the LOU/M strain of rat previously considered resistant to EAE, and support the idea that the encephalitogenic property of BP and other CNS Ag for a given MHC is encompassed within immunodominant T cell epitopes. Furthermore, the TCR sequence data indicate the predominant use of a different V beta 8 subfamily member (V beta 8.5) than the V beta 8.2 gene used preferentially by several other rat strains and the PL/J mouse in the T cell response to BP.


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