Restricted accessResearch articleFirst published online 2018-04
miR-522 Modulated the Expression of Proinflammatory Cytokines and Matrix Metalloproteinases Partly via Targeting Suppressor of Cytokine Signaling 3 in Rheumatoid Arthritis Synovial Fibroblasts
microRNAs have been reported to play important roles in the pathogenesis of rheumatoid arthritis (RA). This study examined the effects of miR-522 on the biological behaviors of RA synovial fibroblasts. The expression levels of miR-522 and relevant genes were measured by quantitative real-time PCR. The protein levels of cytokines were determined by ELISA assay. The protein levels of matrix metalloproteinases (MMPs) and suppressor of cytokine signaling 3 (SOCS3) were determined by western blot assay. Luciferase reporter assay was used to confirm the potential target of miR-522. Our results showed that miR-522 was upregulated in synovial fibroblasts from RA patients, and miR-522 expression level was significantly associated with the RA-associated clinical parameters. miR-522 overexpression increased the mRNA and protein expression levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) and MMPs (MMP-1, MMP-3, and MMP-13) in RA synovial fibroblasts. Lipopolysaccharide induced the upregulation of TNF-α, IL-1β, and MMPs in RA synovial fibroblasts, which was reversed by miR-522 knockdown. Bioinformatics analysis identified SOCS3 as a potential target of miR-522, and this target of miR-522 was confirmed by luciferase reporter assay, and miR-522 overexpression suppressed the mRNA and protein expression levels of SOCS3. The enforced expression of SOCS3 attenuated the enhanced effects of miR-522 on mRNA expression levels of TNF-α, IL-1β, and MMPs. Collectively, our results suggested that miR-522 regulated the expression of proinflammatory cytokines and MMPs partly via targeting SOCS3 in RA synovial fibroblasts, which may contribute to pathogenesis of RA.
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