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Inflammatory immune cell responses and Toll-like receptor expression in synovial tissues in rheumatoid arthritis patients treated with biologics or DMARDs

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Abstract

Biologic antirheumatic drugs (BIO) have been reported to be potent therapeutic agents in the prevention of inflammatory joint destruction in rheumatoid arthritis (RA). The aim of this study was to investigate the immune-inflammatory cells, including Toll-like receptor (TLR)-equipped cells, in synovial tissue samples from RA patients on BIO compared to patients, who are only on conventional disease-modifying antirheumatic drug (DMARD). We analyzed immune-inflammatory cells in RA synovitis in patients of BIO group (n = 20) or DMARD group (n = 20). The grading scores of synovitis was 1.7 and 1.8 in each BIO and DMARD group and correlated best with the CD3+ T (r = 0.71/0.70, p < 0.05) and CD20+ B (r = 0.80/0.84, p < 0.05) cells in the both groups, but less well with the CD68+ macrophages and S-100+ dendritic cells (DCs). Interestingly, both T (116 vs. 242, p < 0.05) and B (80 vs. 142, p < 0.05) cell counts were lower in the BIO than in the DMARD group, whereas macrophage and DC counts did not differ. In contrast, the C-reactive protein (CRP) and disease activity score DAS28-CRP did not show clear-cut correlations with the inflammatory grade of the synovitis (r range, 0–0.35). Similar numbers of cells immunoreactive for TLR-1 to TLR-6 and TLR-9 were found in synovitis in both groups. Patients clinically responding to biologics might still have the potential of moderate/severe local joint inflammation, composed in particular of and possibly driven by the autoinflammatory TLR+ cells.

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Acknowledgment

We sincerely thank a lot Ms. Eiko Saito for her skillful technical support in immunohistochemistry. Y. Takakubo from Japan was supported by the Excellent Young Researchers Overseas Visit Program, the Japan Society for the Promotion of Science (21–8117), and Y. T. Konttinen from Finland by ORTON Orthopedic Hospital, Helsinki University Central Hospital, Sigrid Jusélius Foundation, Finska Läkaresällskapet, and the Danish Council for Strategic Research (“Individualized musculoskeletal medicine”).

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Correspondence to Yuya Takakubo.

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Takakubo, Y., Tamaki, Y., Hirayama, T. et al. Inflammatory immune cell responses and Toll-like receptor expression in synovial tissues in rheumatoid arthritis patients treated with biologics or DMARDs. Clin Rheumatol 32, 853–861 (2013). https://doi.org/10.1007/s10067-013-2209-3

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  • DOI: https://doi.org/10.1007/s10067-013-2209-3

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