Annals of the Rheumatic Diseases 2005;64:1075-1078
© 2005 by BMJ Publishing Group Ltd & European League Against Rheumatism
CONCISE REPORT
X linked agammaglobulinaemia and rheumatoid arthritis
1 Department of Rheumatology, University Hospital Gent, Belgium
2 Laboratory of Pharmaceutical Biotechnology, University of Gent, Belgium
3 Department of Pathology, University of Gent, Belgium
Correspondence to:
Correspondence to:
Assistant Professor D Elewaut
Department of Rheumatology, University Hospital Gent, De Pintelaan 185, 9000 Gent, Belgium; dirk.elewaut{at}ugent.be
Background: Much interest has been shown recently in the pathogenic role of B cells in rheumatoid arthritis (RA) owing to the marked clinical responses to anti-CD20 treatment in RA.
Case report: A patient with X linked agammaglobulinaemia (XLA) presented with an erosive symmetric polyarthritis with histological features of RA, including formation of a destructive pannus. Furthermore, the patient developed subcutaneous nodules that were histologically indistinguishable from rheumatoid nodules. Surprisingly, lymphocytic infiltrates in both the synovium and nodule consisted almost exclusively of CD8+ T cells.
Discussion: Although some peculiar B cell subsets have been described in patients with XLA, no B cell subsets could be demonstrated in synovial tissue or the subcutaneous nodule. This case illustrates that classical RA can develop in the absence of mature B cells.
Abbreviations: Btk, Brutons tyrosine kinase; GPI, glucose-6-phosphate isomerase; MC, metacarpophalangeal; PCR, polymerase chain reaction; RA, rheumatoid arthritis; XLA, X linked agammaglobulinaemia
Keywords: B cells; X linked agammaglobulinaemia; rheumatoid arthritis
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