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KMID : 0311120190600060585
Yonsei Medical Journal
2019 Volume.60 No. 6 p.585 ~ p.591
Upregulation of miR-27b Facilitates Apoptosis of TNF-¥á-Stimulated Fibroblast-Like Synoviocytes
Lei Shangwen

Chen Guanghua
Deng Liang
He Jianying
Abstract
Purpose: The aim of this study was to explore the function of microRNA-27b (miR-27b) in fibroblast-like synoviocytes (FLSs) stimulated by tumor necrosis factor ¥á (TNF-¥á).

Materials and Methods: mRNA expression of miR-27b in FLS cells (MH7A) treated with or without TNF-¥á was determined by q-PCR. MiR-27b mimics was transfected into MH7A cells to upregulate miR-27b expression. MTT assay and flow cytometry analysis were performed to investigate the effect of miR-27b on MH7A cell viability and apoptosis. The targets of miR-27b were predicted by TargetScan. The direct regulation of miR-27b on IL-1¥â expression was verified by luciferase assay. The protein expression levels of apoptosis-related proteins, IL-1¥â, and NF-¥êB signaling-related proteins were detected by Western blot.

Results: We discovered that miR-27b expression was decreased in MH7A cells stimulated by TNF-¥á. Upregulation of miR-27b by miR-27b mimics significantly inhibited the proliferation and promoted the apoptosis of TNF-¥á-stimulated MH7A cells. Consistently, upregulation of miR-27 decreased the level of Bcl-2 and increased Bax and caspase-3 expression in MH7A cells stimulated by TNF-¥á. Luciferase assay revealed that IL-1¥â was indeed a target of miR-27b. By quantitative real-time PCR and Western blot, we found that the expression of IL-1¥â is negatively regulated by miR-27b. Moreover, the NF-¥êB signaling pathway was significantly inhibited by miR-27b.

Conclusion: Taken together, our results illustrated that enhanced miR-27b expression results in the suppression of proliferation and the promotion of apoptosis in FLSs stimulated by TNF-¥á, partially by regulating IL-1¥â expression and NF-¥êB signaling.
KEYWORD
miR-27b, rheumatoid arthritis, NF-¥êB signaling pathway, IL-1¥â
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