title: IgM-rheumatoid factors cross-reactive with IgG and a cell nuclear antigen: immunopathological implications?
abstract: The cross-reaction of IgM-rheumatoid factors (IgM-RF) with a cell nuclear antigen has been further investigated by immunofluorescence procedures. This reaction appears to be optimal at pH 8-9, and fails to occur at pH 6.5. No evidence was obtained by immunofluorescence that IgM-RF bound to the cell nuclear antigen fixes complement. It would appear that the nuclear reactivity of IgM-RF may be of limited immunopathological significance, though this reaction is of note in understanding the behavioural nature of rheumatoid factors.
mesh_terms: D000974:Antibodies, Antinuclear / Q000276:immunology; D000941:Antigens / Q000276:immunology*; D001172:Arthritis, Rheumatoid / Q000276:immunology; D002467:Cell Nucleus / Q000276:immunology*; D003168:Complement Fixation Tests; D003429:Cross Reactions; D005455:Fluorescent Antibody Technique; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007074:Immunoglobulin G / Q000276:immunology*; D007075:Immunoglobulin M / Q000276:immunology*; D009994:Osmolar Concentration; D012217:Rheumatoid Factor / Q000276:immunology*
chemical_list: D000974:Antibodies, Antinuclear; D000941:Antigens; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D012217:Rheumatoid Factor