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The Journal of Immunology, Vol 146, Issue 4 1216-1219, Copyright © 1991 by American Association of Immunologists

ARTICLES

Properties of murine antibodies from different V region families specific for bromelain-treated mouse erythrocytes

JD Conger, HJ Sage, S Kawaguchi and RB Corley
Department of Microbiology and Immunology, Duke University Medical Center, Durham, NC 27710.

We have analyzed the combining site diversity of murine antibodies reactive with bromelain-treated mouse RBC (BrMRBC) in B10.A mice. Although several VH and V kappa genes are used to generate antibodies of this specificity, two combinations account for more than 80% of the repertoire from the spleen: VH11/V kappa 9 and VH12/V kappa 4. Antibodies representing these two predominant groups were found to correspond to two previously reported distinct cross-reactive Id families accounting for most of the anti-BrMRBC reactivity in several strains of mice. mAb of the VH11/V kappa 9 type bound the haptens trimethyl-ammonium and phosphorylcholine much more avidly (approximately 1000 fold) than did the VH12/V kappa 4 type antibodies. Both of these haptens represent constituents of phosphatidylcholine, which BrMRBC-specific antibodies are reported to bind. Despite this differential reactivity, members of both the VH11/V kappa 9 and VH12/V kappa 4 antibody groups lysed BrMRBC with similar efficiencies. These data suggest that the two major classes of BrMRBC-specific antibodies have at least partially different specificities and imply that the events that lead to their high frequencies in the CD5+ repertoire may result from different selective forces.


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