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10 March 2017 : Laboratory Research  

miR-181a Modulates Chondrocyte Apoptosis by Targeting Glycerol-3-Phosphate Dehydrogenase 1-Like Protein (GPD1L) in Osteoarthritis

Xicheng Zhai1BCDE*, Ru Meng1BC, Hongbiao Li1CD, Jie Li1EF, Lei Jing1EF, Lei Qin1BD, Yulei Gao2AG

DOI: 10.12659/MSM.899228

Med Sci Monit 2017; 23:1224-1231

Abstract

BACKGROUND: miR-181a is a small non-coding RNA known to be dysregulated in osteoarthritis (OA), but the role of miR-181a in human OA remains unclear. The aim of this study was to identify its function and molecular target in chondrocytes during OA pathogenesis.

MATERIAL AND METHODS: The function of miR-181a was assessed by gain-of-function studies in human OA chondrocytes. Potential targets of miR-181a were predicted using series of bioinformatics and intersection analysis, then confirmed by luciferase reporter assay. Gene expression was quantified using quantitative reverse transcription PCR (qRT-PCR) assays, and protein production was quantified by Western blot analysis.

RESULTS: The FITC apoptosis assay results indicated that the upregulation of miR-181a led to an increase of apoptosis rate in chondrocytes. Then bioinformatic analysis identified potential target sites of the miR-181a located in the 3’ untranslated region of GPD1L. Dual-luciferase reporter assays results showed that GPD1L is a target gene of miR-181a. Furthermore, Western blot and qRT-PCR analysis demonstrated that miR-181a inhibited GPD1L gene expression. Increased GPD1L and decreased miRNA-181a were observed in tissues from osteoarthritis patients. Moreover, we found a highly negative correlation between miRNA-181a and GPD1L.

CONCLUSIONS: Our results demonstrated that miR-181a may play an important role in the pathogenesis of OA through targeting GPD1L and regulating chondrocyte apoptosis.

Keywords: Chondrocytes, Osteoarthritis

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750