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- W1990108686 abstract "Abstract Objective Treatment of rheumatoid arthritis (RA) with tumor necrosis factor (TNF)–blocking agents, including etanercept and infliximab, has resulted in reductions in the radiographic progression of RA. However, the exact mechanism by which this protection occurs has not been determined. In order to add to such knowledge, we investigated the effect of anti‐TNF therapy on the expression of osteoprotegerin (OPG) and receptor activator of NF‐κB ligand (RANKL) in synovial tissue. Methods The expression of OPG and RANKL in synovial biopsy specimens was evaluated by immunohistochemistry. Serial synovial biopsy specimens were obtained from 18 patients with RA, before and after treatment with etanercept (9 patients) or infliximab (9 patients). Biopsy specimens were evaluated by double‐blind semiquantitative analysis and image analysis. The in vitro effect of TNF antagonists on the RANKL/OPG expression in osteoblasts and endothelial cells was evaluated by Western blotting. Statistical analysis was performed using Wilcoxon's signed rank test, followed by the Bonferroni correction for multiple comparisons of paired samples. The results of in vitro experiments were evaluated by one‐way analysis of variance, with Tukey's post hoc test. Results Treatment with both infliximab and etanercept increased the expression of OPG in synovial tissue. After 8 weeks of treatment, neither infliximab nor etanercept influenced RANKL expression. In both groups of patients, the RANKL:OPG ratio decreased following therapy. In vitro, both of the TNF antagonists mimicked the in vivo effect, inducing a decrease in the RANKL:OPG ratio in TNF‐primed osteoblasts and endothelial cells. Conclusion Therapy with TNF antagonists in RA modulates the OPG/RANKL system, a potential mechanism that could explain the retardation of radiographic damage observed following anti‐TNF therapy." @default.
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- W1990108686 date "2005-12-29" @default.
- W1990108686 modified "2023-10-11" @default.
- W1990108686 title "Anti–tumor necrosis factor therapy increases synovial osteoprotegerin expression in rheumatoid arthritis" @default.
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- W1990108686 doi "https://doi.org/10.1002/art.21528" @default.
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