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Four highly purified synthetic peptides encompassing segments of the 68-86 region [for the numbering system used, see Eylar, E.H., Brostoff, S., Hashim, G., Caccam, J. &amp; Burnett, P. (1971) J. Biol. Chem. 246, 5770-5784] of myelin basic protein (MBP), a region known to induce experimental allergic encephalomyelitis (EAE) in Lewis rats, were used to define and compare structure-function relationships between the primary structure of the 68-86 sequence and the three following biological activities: induction of EAE in Lewis rats, stimulation of T lymphocytes in vitro as measured by augmented cellular transfer of EAE to syngeneic recipients, and lymphocyte proliferation, as measured by [3]thymidine incorporation. Guinea pig (GP) MBP was approximately 60 or 1500 times more active than the GP68-84 (Y G S L P Q K S Q R S Q D E N; single-letter amino acid abbreviations) or the modified bovine (MB) 68-84 (Y G S L P Q K A Q R P Q D E N) peptides for induction of EAE, respectively. Furthermore, lymphocytes primed with either GPMBP, GP68-84, or MB68-84 crossreacted in vitro with either GPMBP, GP68-84, or MB68-84 for activation of lymphocyte transfer activity. In contrast, lymphocytes primed with either GP68-84 or MB68-84 exhibited antigen-specific proliferation in vitro exclusively in response to either GP or MB sequences, respectively. Neither GP75-84 (S Q R S Q D E N) nor GP75-86 (S Q R S Q D E N P V) induced EAE, activated lymphocytes for EAE transfer, or stimulated lymphocyte proliferation under conditions and doses tested. We conclude that (i) structurally distinct determinants, reflecting existence of functionally independent classes of antigen receptors, specify encephalitogenic and proliferative responses of primed lymphocytes and (ii) determinants for EAE induction, cellular transfer of EAE, and lymphocyte proliferation include amino acid residues in the 68-74 (Y G S L P Q K) sequence of GPMBP.

proceedings of the national academy of sciences of the united states of america

Induction of experimental allergic encephalomyelitis in Lewis rats with purified synthetic peptides: delineation of antigenic determinants for encephalitogenicity, in vitro activation of cellular transfer, and proliferation of lymphocytes.