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Biology of Reproduction, Vol 38, 1093-1103, Copyright © 1988 by Society for the Study of Reproduction

ARTICLES

Characterization of antibodies to idiotypic determinants of monoclonal anti-sperm antibodies

CP Carron, HW Jarvis and PM Saling
Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina 27710.

Rabbit polyclonal antibodies to the idiotype of murine monoclonal anti- sperm antibodies were developed and characterized. M29.6 and M42.15 are monoclonal antibodies (mAbs) that inhibit fertilization in vivo and in vitro. Sera from rabbits inoculated with purified mAbs (Ab1) were absorbed with normal mouse and isotype-specific immunoglobulin (Ig); the anti-idiotype Ig fraction (Ab2) was isolated by protein A- chromatography or by chromatography on the corresponding idiotype column. Binding specificity of Ab2 was confirmed by measuring the reactivity of Ab2 with homologous and heterologous mAbs. Ab2 competitively inhibited 125I-labeled Ab1 binding to mouse sperm, suggesting that the Ab2 preparation possessed subpopulations directed against idiotopes similar or adjacent to the antigen-binding site of the mAb. Anti-idiotype antibodies reactive with the antigen-combining site of the anti-sperm mAb may contain subpopulations that mimic the mouse sperm epitope recognized by Ab1. Immunization with Ab2 induced anti-(anti-idiotype) antibodies (Ab3), which competitively inhibited binding of 125I-labeled Ab1 to immobilized Ab2. These results are consistent with the hypothesis that immunization of mice with antibodies to the idiotype of sperm-specific mAbs can induce antibodies that share structural similarities with the anti-sperm mAb used for their induction. Immunization with anti-idiotype antibodies that mimic sperm antigen structure represents a possible strategy for induction of immunity to sperm.




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Copyright © 1988 by the Society for the Study of Reproduction.