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IL‑1β increases the expression of inflammatory factors in synovial fluid‑derived fibroblast‑like synoviocytes via activation of the NF‑κB‑mediated ERK‑STAT1 signaling pathway.

Mol Med Rep. 2019 Dec;20(6):4993-5001. doi:10.3892/mmr.2019.10759. Epub 2019 Oct 21
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摘要


Interleukin (IL)‑1β serves a crucial role in the progression of rheumatoid arthritis. Previous studies have indicated that the signaling pathway may be involved in the inflammatory response in synovial fluid‑derived fibroblast‑like synoviocytes (sfd‑FLSs). However, the molecular mechanisms underlying the pathological effects of the inflammatory factors induced by IL‑1β in sfd‑FLSs remain unclear. The aim of the present study was to investigate the IL‑1β‑mediated signaling pathways involved in the expression of inflammatory factors in sfd‑FLSs and in a rat model of rheumatoid arthritis. Reverse transcription‑quantitative PCR, western blotting, and immunohistochemistry were used to analyze the role of IL‑1β in the rat model of rheumatoid arthritis. The results suggested that IL‑1β administration exacerbated rheumatoid arthritis, bone injury and increased the expression levels of inflammatory factors, such as IL‑17 and tumor necrosis factor α (TNF‑α), whereas treatment with anti‑IL‑1β exhibited opposite effects. In vitro experiments in sfd‑FLSs further suggested that treatment with IL‑1β influenced the expression levels of various inflammatory factors. In specific, IL‑1β increased the expression of IL‑17 and TNF‑α, and decreased the expression of IL‑6 and IL‑10 in sfd‑FLSs. Additionally, treatment with IL‑1β increased the mRNA expression and protein phosphorylation of NF‑κB, ERK and in sfd‑FLSs. Treatment with anti‑IL‑1β exhibited opposite effects on the expression levels of inflammatory factors and suppressed the NF‑κB‑mediated signaling pathway activation in sfd‑FLSs. Finally, treatment with a NF‑κB inhibitor suppressed the effects of IL‑1β, and NF‑κB overexpression reversed the effects of anti‑IL‑1β on the expression levels of IL‑17, TNF‑α, NF‑κB, ERK and In conclusion, the present results demonstrated that treatment with IL‑1β increased the expression levels of inflammatory factors in sfd‑FLSs via the regulation of the NF‑κB‑mediated ERK/duanyu18131 signaling pathway in a rat model of rheumatoid arthritis. Therefore, the signaling pathway may represent a potential target for the development of novel treatments for rheumatoid arthritis.

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