title: Regulation of azophenylarsonate-specific repertoire expression. II. Fine specificity and isotype heterogeneity of anti-arsonate antibodies.
abstract: This report investigates the isotope and binding site heterogeneity of IgG anti-azophenylarsonate (ARS) monoclonal antibodies derived from splenic fragment cultures of nonimmune and immune A/J mice. By using five arsanilic acid derivatives in a hapten inhibition assay to determine fine specificity, the secondary ARS-specific repertoire was found to be extremely heterogeneous, with 52 unique patterns among the 81 antibodies analyzed. CRIA+ and CRIA+/- clonotypes were as heterogeneous as CRIA- antibodies, but a majority of CRIA+/- clones maintained a characteristic relative affinity for two of the haptens, p-arsanilic acid (p-ARS) and p-azobenene arsonic acid-N-tyrosine (ABA-tyr), which was identical to the prototype CRIA+ hybridoma protein R16.7. We also observed that the average relative affinity of CRIA- antibodies from immunized donors was higher than nonimmune mice with respect to p-ARS and ABA-tyr, and that there was a further increase in avidity to ABA-tyr over time after immunization. In contrast, no affinity maturation occurred among the CRIA+ and CRIA+/- clones. Rare antibodies were also identified within the nonimmune repertoire that had higher relative affinities than R16.7. Despite this, a greater proportion of CRIA+ and CRIA+/- clones produced IgG antibody in vitro. Thus, the predominance of CRIA+ antibodies in the ARS-specific immune repertoire and the preferential differentiation of CRIA+ precursor cells to IgG secretors cannot be entirely explained by the avidity of this clonotype family for p-ARS or ABA-tyr.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000032:analysis / Q000235:genetics*; D000915:Antibody Affinity; D001391:Azo Compounds / Q000276:immunology*; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology; D001666:Binding Sites, Antibody; D002999:Clone Cells / Q000276:immunology; D000939:Epitopes / Q000235:genetics*; D007126:Immunoglobulin Allotypes / Q000235:genetics*; D007074:Immunoglobulin G / Q000032:analysis; D007130:Immunoglobulin Idiotypes / Q000032:analysis; D051379:Mice; D008805:Mice, Inbred A; D013154:Spleen / Q000166:cytology; D013997:Time Factors; D010132:p-Azobenzenearsonate / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D001391:Azo Compounds; D000939:Epitopes; D007126:Immunoglobulin Allotypes; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D010132:p-Azobenzenearsonate