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The Journal of Immunology, Vol 143, Issue 12 4044-4052, Copyright © 1989 by American Association of Immunologists

ARTICLES

Diversity in the available repertoire of murine antibodies reactive with bromelain-treated isologous erythrocytes

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

Antibodies specific for bromelain-treated mouse RBC (BrMRBC) are of interest as models of "natural autoantibodies" and because of their primary source is Ly-1+ (CD5+) B cells. In earlier work by others, anti- BrMRBC hybridomas prepared by using CBA or NZB "spontaneously activating" peritoneal B cells were all found to produce mAb with a single common H chain V region sequence, by using a novel gene (VH11p), and a single common L chain V region sequence, a member of the Vk9 group (VkBrMp). We prepared anti-BrMRBC hybridomas by using LPS- activated B10.A splenic B cells in order to reveal the maximum available diversity in this repertoire. Data based on binding studies, Northern blot analyses with V region-specific probes, and mRNA nucleotide sequence analysis indicated that there is combining-site diversity in the repertoire of anti-BrMRBC hybridomas. There was considerable variation in trimethylammonium (a constituent of phosphatidyl choline) binding efficiency, and one of the anti-BrMRBC mAb showed no detectable binding. Northern blot analyses indicated 6 of 11 mAb to be of the VH11p/VkBrMp type, including one dual reactive anti- [BrMRBC + SRBC] mAb. Sequence analyses of the H chain V regions of four of the non-VH11p mAb revealed utilization of four distinct VH, three of which are very similar to the VH expressed by Ly-1+ B cell clones or lymphomas, as reported by others. However, because the VH11p/VkBrMp- type mAb were all relatively efficient at lysing BrMRBC and binding trimethylammonium, we suggest that affinity considerations may determine the selective predominance of B cells with this V region configuration from an available repertoire of considerable diversity.


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