The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 146, 1323-1331, Copyright © 1977 by Rockefeller University Press

ARTICLES

Immune response of Lewis rats to peptide C1 (residues 68-88) of guinea pig and rat myelin basic proteins

RF Kibler, RB Fritz, F Chou, C-H Jen Chou, NY Peacocke, NM Brown and DE McFarlin

Peptide C1 (residues 68-88) from GP and rat BP differ by a single amino acid interchange at residue 79. This residue is serine in GP C1 and threonine in rat C1. GP C1 was encephalitogenic in Le rats at doses as low as 15 ng. Rat C1 was encephalitogenic at doses of 1,500 ng or greater. LNC from rats challenged with 25 X 10(-4) micronmol of GP C1 and 250 X 10(-4) micronmol of rat C1 showed a proliferative response in vitro to both peptides, but in each instance the magnitude of the response was greater to the GP peptide. GP C1 also induced higher levels of circulating antibodies at 25 X 10(-4) micronmol, but the specificity of antibodies produced by the two peptides was the same. These results have been interpreted as indicating that the presence of serine at position 79 in GP C1 results in the stimulation of greater numbers of T cells involved in (a) the induction of EAE, (b) the in vitro proliferative response and (c) helper function in antibody production.
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