Overexpression of miR-98 inhibits cell invasion in glioma cell lines via downregulation of IKKε.

OBJECTIVE:MicroRNAs (miRNAs) function as negative regulators for the expression of genes involved in cancer metastasis. The aim of this study was to investigate the potential role of miR-98 in gliomas and validate its regulatory mechanism. PATIENTS AND METHODS:Cell viability assays are used to measure proliferation of cell. mRNA expression is measured by qRT-PCR. Western blot analysis is used to measure protein expression. RESULTS:Functional studies showed that miR-98 overexpression inhibited glioma migration and invasion, but had no effect on the cell viability. An enhanced green fluorescent protein reporter assay, quantitative RT-PCR, and a western blot analysis confirmed that miR-98 suppressed the expression of IκB kinase (IKKε) by directly targeting its 3'-untranslated region, also, the NF-κB p65 nuclear translocation and matrix metalloproteinase (MMP)-9 expression were significantly arrested in glioma cells treated with miR-98 mimics. Accordingly, the overexpression of IKKε or NF-κB p65 can restore cell migration and invasion after being inhibited by miR-98, and can restore NF-κB p65 nuclear translocation as well as increase MMP-9 expression. CONCLUSIONS:These findings demonstrated that miR-98 functions as a tumor suppressor in gliomas. Furthermore, miR-98 may act as a potential therapeutic biomarker for glioma patients.

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