title: Composition and biological behaviour of immune complexes isolated from synovial fluid of patients with juvenile rheumatoid arthritis (JRA).
abstract: Data published from in vitro studies have shown that IgM-rheumatoid factor (RF)-bearing immune complexes possess several biological features that may contribute to their pathogenicity. However, no studies have demonstrated that such complexes exist at sites of inflammation in children with rheumatoid disease. We used two methods of sequential column chromatography to purify immune complexes from synovial fluids of children with JRA. We demonstrate that high molecular weight complexes contain IgM-RF, have not bound C4 in vivo, but activate the classical pathway in vitro. In contrast, complexes which have bound C3 in vivo do not contain IgM-RF and are weak complement activators in vitro.
authors.affiliation: Department of Paediatrics, Wayne State University School of Medicine, Detroit, MI, USA.
authors.forename: J N
authors.initials: JN
authors.lastname: Jarvis
authors.forename: M M
authors.initials: MM
authors.lastname: Diebold
authors.forename: M K
authors.initials: MK
authors.lastname: Chadwell
authors.forename: M
authors.initials: M
authors.lastname: Iobidze
authors.forename: H T
authors.initials: HT
authors.lastname: Moore
mesh_terms: D000293:Adolescent; D000936:Antigen-Antibody Complex / Q000737:chemistry*; D001171:Arthritis, Juvenile / Q000276:immunology*; D002648:Child; D003167:Complement Activation; D005260:Female; D006801:Humans; D007070:Immunoglobulin A / Q000276:immunology; D007075:Immunoglobulin M / Q000276:immunology; D008297:Male; D008970:Molecular Weight; D012217:Rheumatoid Factor / Q000276:immunology; D013582:Synovial Fluid / Q000276:immunology
chemical_list: D000936:Antigen-Antibody Complex; D007070:Immunoglobulin A; D007075:Immunoglobulin M; D012217:Rheumatoid Factor