title: Idiotypic determinants on human anti-insulin antibodies are cyclically expressed.
abstract: Insulin-treated diabetics develop a heterogeneous antibody response to the protein hormone. To understand the repertoire of this diverse immune response, we developed monoclonal antibodies (Mab) that recognize idiotypic determinants on anti-insulin antibodies. Two Mab that recognize distinct idiotopes on anti-insulin antibodies were studied in detail. These idiotopes were present on IgG, but not IgM, anti-insulin antibodies from the proband and from four of 11 insulin-treated diabetics. The determinants recognized were distinct from conventional allotype (Gm) markers and were found in both Type I and Type II diabetics. The partial inhibition of anti-idiotope binding by beef insulin suggests that idiotopes related to the binding site for beef insulin may be recognized. When the presence of idiotope-positive molecules was determined sequentially during insulin therapy, in one patient, idiotope expression was found to be cyclical. In contrast, the total amount of anti-insulin antibody was constant, whereas idiotope expression varied. These data suggest that common V region determinants are employed in the anti-insulin response, and their variable expression may reflect dynamic regulation during chronic insulin therapy.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology*; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D002417:Cattle / Q000276:immunology; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D003924:Diabetes Mellitus, Type 2 / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D007075:Immunoglobulin M / Q000276:immunology; D007328:Insulin / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C
chemical_list: D000906:Antibodies; D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000939:Epitopes; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D007075:Immunoglobulin M; D007328:Insulin