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Expression of the Activation Antigen CD27 in Rheumatoid Arthritis

https://doi.org/10.1006/clin.1996.0106Get rights and content

Abstract

Differentiation of CD4+T-cells is reflected by the change from the CD45RA+CD27+phenotype via CD45RO+CD27+to the CD45RO+CD27phenotype. To provide insight into the migration and activation of T-cells at the site of inflammation in rheumatoid arthritis (RA), CD27 expression by T-cells in peripheral blood (PB), synovial fluid (SF), and synovial tissue (ST) as well as the levels of the soluble form of CD27 (sCD27) in plasma and SF were studied in patients with RA. Since CD4+CD27+T-cells are involved in providing helper activity for B-cells, we also investigated the levels of rheumatoid factors in serum and SF in relation to CD27 expression. The mean level of sCD27, which is produced by CD27+cells, and the mean percentage of CD27T-cells within the CD4+CD45RAsubset were higher in SF than in PB. SF sCD27 levels were higher in the patients with RA than in the patients with osteoarthritis, who served as controls. In ST infiltration by CD4+CD45RO+CD27+T-cells could be demonstrated in the rheumatoid perivascular lymphocytic aggregates with a relative increase in the percentage of CD27T-cells in the diffuse lymphocytic infiltrate. The sCD27 levels and the percentages of CD4+CD27+cells in SF correlated positively with the levels of rheumatoid factors in serum and SF. The findings presented in this study suggest a continuous influx of preactivated CD4+CD45RO+CD27+cells from the PB into the rheumatoid ST and further activation and differentiation to CD4+CD45RO+CD27cellsin situ,followed by migration to the SF. These activated T-cells are likely to play a role in synovial inflammation.

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