Rheumatology Advance Access originally published online on July 13, 2004
Rheumatology 2004 43(10):1283-1287; doi:10.1093/rheumatology/keh312
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Rheumatology Vol. 43 No. 10 © British Society for Rheumatology 2004; all rights reserved
Paper |
Antibody response to the human stress protein BiP in rheumatoid arthritis
Department of Rheumatology, GKT School of Medicine, King's College London, Guy's Hospital, London SE1 9RT, UK, 1 Department of Rheumatology, University Hospital, Umeå, Sweden and 2 Department of Pathophysiology, School of Medicine, University of Athens, Greece.
Correspondence to: M. Bodman-Smith, St George's Hospital Medical School, London SW17 0RE, UK. E-mail: mbodmans{at}sghms.ac.uk
Objectives. The human stress protein BiP (immunoglobulin binding protein) has been implicated in the pathogenesis of rheumatoid arthritis (RA) since BiP was found to stimulate synovial T-cell proliferation and anti-BiP antibodies are present in the serum of RA patients. The aim of this study was the development of a rapid and reproducible enzyme-linked immunosorbent assay (ELISA) to determine the specificity and sensitivity of anti-BiP antibodies in RA.
Methods. An ELISA was developed that detected antibodies to BiP. The prevalence of anti-BiP antibodies was determined in sera from patients with early and established RA, sera antedating the onset of RA and sera from patients with other inflammatory and autoimmune diseases and healthy controls.
Results. We have confirmed the increased prevalence of antibodies to BiP in the sera of a large cohort of patients with established RA (specificity 71% and sensitivity 73%) and early RA (specificity 65% and sensitivity 66%). In pre-disease sera, median 2.5 yr (interquartile range 1.14.7) before symptoms of joint disease, the sensitivity for anti-BiP antibodies was 45% and the specificity was 65% for the development of RA.
Conclusion. Antibodies to BiP are found in the sera of patients with RA and in sera antedating the onset of RA.
KEY WORDS: Rheumatoid arthritis, Heat shock protein, Antibodies, ELISA
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