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2015 ; 10
(ä): 72
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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[Jun]; 10
(ä): 72
PMID26088648
show 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.