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• W1974545869 abstract "Abstract Objective To assess the expression of Toll‐like receptor 3 (TLR‐3) protein in synovial tissues and cultured synovial fibroblasts obtained from patients with rheumatoid arthritis (RA) and osteoarthritis (OA) and to investigate the consequences of stimulation of cultured synovial fibroblasts with TLR‐3 ligands. Methods TLR‐3 expression in synovial tissues was determined by immunohistochemistry and immunofluorescence, and expression in cultured RA synovial fibroblasts (RASFs) was determined by fluorescence‐activated cell sorting and real‐time polymerase chain reaction techniques. TLR‐3 signaling was assessed by incubating RASFs with poly(I‐C), lipopolysaccharide, palmitoyl‐3‐cysteine‐serine‐lysine‐4, or necrotic synovial fluid cells from RA patients in the presence or absence of hydroxychloroquine or Benzonase. Subsequent determination of interferon‐β (IFNβ), CXCL10, CCL5, and interleukin‐6 (IL‐6) protein production in the culture supernatants was performed by enzyme‐linked immunosorbent assays. Results TLR‐3 protein expression was found to be higher in RA synovial tissues than in OA synovial tissues. TLR‐3 expression was localized predominantly in the synovial lining, with a majority of the TLR‐3–expressing cells coexpressing fibroblast markers. Stimulation of cultured RASFs with the TLR‐3 ligand poly(I‐C) resulted in the production of high levels of IFNβ, CXCL10, CCL5, and IL‐6 protein. Similarly, coincubation of RASFs with necrotic synovial fluid cells from patients with RA resulted in up‐regulation of these cytokines and chemokines in a TLR‐3–dependent manner. Conclusion Our findings demonstrate the expression of TLR‐3 in RA synovial tissue and the activation of RASFs in vitro by the TLR‐3 ligand poly(I‐C) as well as by necrotic RA synovial fluid cells, and indicate that RNA released from necrotic cells might act as an endogenous TLR‐3 ligand for the stimulation of proinflammatory gene expression in RASFs." @default.
• W1974545869 created "2016-06-24" @default.
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• W1974545869 date "2005-09-01" @default.
• W1974545869 modified "2023-10-11" @default.
• W1974545869 title "RNA released from necrotic synovial fluid cells activates rheumatoid arthritis synovial fibroblasts via toll-like receptor 3" @default.
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• W1974545869 doi "https://doi.org/10.1002/art.21273" @default.
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