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Deprecated: Implicit conversion from float 249.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Diagn+Pathol 2015 ; 10 (ä): ä Nephropedia Template TP
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MicroRNA-26b inhibits cell proliferation and cytokine secretion in human RASF cells via the Wnt/GSK-3?/?-catenin pathway #MMPMID26088648
Sun J; Yan P; Chen Y; Chen Y; Yang J; Xu G; Mao H; Qiu Y
Diagn Pathol 2015[]; 10 (ä): ä PMID26088648show ga
Background: Rheumatoid arthritis (RA) is a chronic systemic auto- immune disease characterized by joint synovitis. Recent evidence suggests that rheumatoid arthritis synovial fibroblasts (RASFs) promote joint destruction. In this study, we investigated the role of microRNA-26b (miR-26b) in cell proliferation and inflammatory cytokine secretion using patient-derived Rheumatoid arthritis fibroblast-like synoviocyte (RAFLS) to understand pathways influencing rheumatoid arthritis. Methods: RAFLS were cultured in vitro and transfected with miR-26b mimics (experimental group) and negative sequence (control group). The protein levels of Wnt4, Wnt5?, GSK-3?, CyclinD1, Ser9-GSK-3? and ?-catenin were detected by western blot analysis. Tumor Necrosis Factor-? (TNF-?), IL- 1?, and IL-6 levels were quantified by Enzyme-linked Immunosorbent Assay (ELISA). RAFLS proliferation and apoptosis were measured by 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyl tetrazolium bromide (MTT) assay and flow cytometry, respectively. Results: GSK-3? and CyclinD1 expression levels were lower in miR-26b mimic group compared to Mock group and negative control (NC) group. Conversely, GSK-3? and CyclinD1 expression levels were markedly higher in the miR-26b inhibitor group compared to Mock and NC group (P?0.05). Transfection of miR-26b mimics significantly increased the, levels of Ser9-GSK-3? and ?-catenin in comparison to Mock and NC groups, while transfection of miR-26b inhibitors showed the opposite effect. In miR-26b mimic group, TNF-?, IL- 1? and IL-6 levels were lower than the Mock and NC groups, while in miR-26b inhibitor group, these cytokine levels were higher than the Mock and NC groups (P?0.05). Transfection of miR-26b mimics significantly reduced the cell proliferation of RAFLS, compared to the Mock and NC groups, and miR-26b inhibitors increased the proliferative capacity of RAFLS compared to Mock and NC groups (P?0.05). The miR-26b mimic group exhibited higher RAFLS apoptosis rate compared to Mock and NC group and miR-26b inhibitor group showed significantly lower RAFLS apoptosis rate compared to Mock and NC groups (P?0.05). Conclusions: MiR-26b regulates ?-catenin and CyclinD1 levels by inhibiting GSK-3? expression, which in-turn alters the Wnt/GSK-3?/?-catenin pathway to lower RAFLS proliferation and elevate cell apoptosis and the secretion of TNF-?,IL-1? and IL-6 cytokines. Therefore, our results show that miR-26B plays a central role in inhibiting the inflammation associated with rheumatoid arthritis. Virtual Slides: The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/9063056861547150