Rheumatology 2002; 41: 466-467
© 2002 British Society for Rheumatology
Paediatric Rheumatology |
Immune complexes contain immunoglobulin A rheumatoid factor in serum and synovial fluid of patients with polyarticular juvenile rheumatoid arthritis
Paediatric Rheumatology/Series Editor: P. Woo
Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226014, India
SIR, Immune complexes (IC) are believed to play a role in the pathogenesis of juvenile rheumatoid arthritis (JRA) [1]. Their prevalence varies from 39 to 79% depending on the method used for their detection [2]. Immunoglobulin M (IgM)- and IgG-containing IC activate the classical complement pathway, whereas IgA-containing IC activate an alternative complement pathway. Several groups, including ours, have shown complement activation through either or both pathways in patients with JRA [3, 4]. IgA rheumatoid factor (RF) has rarely been studied in
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