title: Suppression of rheumatoid factor synthesis by antiidiotypic antibody in rheumatoid arthritis patients with cross-reactive idiotypes.
abstract: The effect of antiidiotypic antibody on the in vitro production of rheumatoid factor was studied in rheumatoid arthritis patients with cross-reactive idiotypic determinants. Antiidiotypic antibodies (ascites IgG) were developed against monoclonal rheumatoid factor (Ka m-RF) by a cell fusion procedure. These antibodies were idiotype-specific, since: 1) they reacted only with F(ab')2 fragment of Ka m-RF; 2) they failed to react with normal IgM without rheumatoid factor activity; and 3) their F(ab')2 fragment inhibited the rheumatoid factor activity of Ka m-RF. The antiidiotypic antibody strongly suppressed the in vitro production of rheumatoid factor by lymphocytes from unrelated rheumatoid arthritis patients with cross-reactive idiotypes. The suppression was specific, since ascites IgG failed to suppress in vitro anti-keyhole limpet hemocyanin antibody production by the lymphocytes. These results indicate that antiidiotypic antibody may influence the regulation of rheumatoid factor production in patients with rheumatoid arthritis.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000918:Antibody Specificity; D001172:Arthritis, Rheumatoid / Q000276:immunology* / Q000378:metabolism; D002478:Cells, Cultured; D003429:Cross Reactions; D006433:Hemocyanins / Q000276:immunology; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D007074:Immunoglobulin G / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000145:classification / Q000276:immunology*; D007075:Immunoglobulin M / Q000096:biosynthesis; D008214:Lymphocytes / Q000378:metabolism; D012217:Rheumatoid Factor / Q000037:antagonists & inhibitors* / Q000096:biosynthesis
chemical_list: D000911:Antibodies, Monoclonal; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D007075:Immunoglobulin M; D012217:Rheumatoid Factor; D006433:Hemocyanins; C032808:keyhole-limpet hemocyanin