title: IgM and IgG anti-F(ab')2 antibodies in rheumatoid arthritis and systemic lupus erythematosus.
abstract: Radioimmunoassays for anti-F(ab')2 antibodies, which feature the use of goat anti-human Fc antibody for correcting potentiation of IgM anti-F(ab')2 antibody titers by endogenous IgM anti-Fc antibodies (rheumatoid factors), are described. Individuals with classic rheumatoid arthritis had significantly more IgM anti-F(ab')2 antibody (P less than 0.001) and IgG anti-F(ab')2 antibody (P = 0.05) than did individuals with systemic lupus erythematosus or normal volunteers. There is some similarity in patterns of isotype distribution of anti-F(ab')2 antibodies and rheumatoid factors.
mesh_terms: D000888:Antibodies, Anti-Idiotypic / Q000032:analysis*; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000276:immunology*; D007074:Immunoglobulin G / Q000276:immunology*; D007075:Immunoglobulin M / Q000276:immunology*; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D011863:Radioimmunoassay; D012217:Rheumatoid Factor
chemical_list: D000888:Antibodies, Anti-Idiotypic; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D012217:Rheumatoid Factor