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OBJECTIVE The aim of this study was to assess T cell receptor V beta-gene expression in the peripheral blood and synovial fluid of rheumatoid arthritis patients. METHODS Cytometric analysis was performed on peripheral blood and synovial fluid lymphocytes from 12 patients using a restricted set of V beta-specific monoclonal antibodies (to V beta 5.1-3, V beta 6.7 and V beta 8). In 5 patients the expression of the V beta 1 through V beta 20 gene families was also analysed, using a recently described method based on a one-side-specificity polymerase chain reaction coupled to reverse dot hybridization. RESULTS Cytometric analysis failed to show any consistent difference in the expression of V beta 5, 6 and 8 between the two compartments on the one hand, or between the peripheral blood of normal individuals and patients on the other hand. The PCR/dot hybridization method did not demonstrate a significant difference in the V beta repertoires between peripheral blood and synovial fluid samples from arthritis patients. However, in all patients the V beta 6, 13 and/or 14 families were expressed to a high level, so that these families frequently represented over 40% of the V beta 1-20 repertoire in both compartments, instead of the approximately 20% seen in normal peripheral blood samples. CONCLUSIONS We conclude that V beta 6, 13 and 14 are overexpressed in both the peripheral blood and synovial fluid of rheumatoid arthritis patients compared to normal samples.
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