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Mediators of Inflammation
Volume 2015 (2015), Article ID 563713, 7 pages
http://dx.doi.org/10.1155/2015/563713
Research Article

Percentages of CD4+CD161+ and CD4−CD8−CD161+ T Cells in the Synovial Fluid Are Correlated with Disease Activity in Rheumatoid Arthritis

1Department of Clinical Immunology, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China
2Department of Neurology, Chinese Navy General Hospital, Beijing 100048, China
3Department of Geriatric Gastroenterology, Chinese People’s Liberation Army General Hospital, Beijing 100853, China
4Institute of Basic Medical Science, Xi’an Medical University, Xi’an 710032, China

Received 17 October 2014; Accepted 1 December 2014

Academic Editor: Lifei Hou

Copyright © 2015 Jinlin Miao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. CD161 has been identified as a marker of human IL-17-producing T cells that are implicated in the pathogenesis of rheumatoid arthritis (RA). This study aimed to investigate the potential link between the percentage of CD161+ T cells and disease activity in RA patients. Methods. Peripheral blood (PB) from 54 RA patients and 21 healthy controls was evaluated. Paired synovial fluid (SF) (n = 17) was analyzed. CD161 expression levels on CD4+, CD8+, and CD4−CD8− T cells were assessed by flow cytometry. Results. The percentage of CD4+CD161+ T cells in RA SF was higher than RA PB, and it was positively correlated with DAS28, erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP). CD4−CD8−CD161+ T cell percentage was decreased in RA PB and was further reduced in RA SF, and its level in SF was inversely correlated with DAS28, ESR, and CRP. However, CD8+CD161+ T cell percentage was neither changed in RA PB and SF nor correlated with disease activity indices. Conclusion. An increased CD4+CD161+ T cell percentage and a decreased CD4−CD8−CD161+ T cell percentage are present in RA SF and are associated with disease activity, and the accumulation of CD4+CD161+ T cells in SF may contribute to the local inflammation of RA.