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Glioma is one of the most frequent primary malignant brain tumours in adults and accumulating evidence has shown that microRNAs (miRNAs) are associated with various types of tumours, including glioma. It is essential to acquire a better understanding of the roles and mechanisms of miRNAs in WNT-driven glioblastoma (GBM). Here, we report that miR-206 inhibited the WNT/β-catenin pathway by directly targeting Frizzled 7 (FZD7) and functioned as a tumour-suppressor in glioma. The expression of miR-206 in human samples and glioma cells was assessed by real-time quantitative PCR (RT-qPCR), fluorescence in situ hybridization (FISH), and histological analysis. Cell Counting Kit-8 (CCK-8), colony formation, EdU, flow cytometry, wound healing, transwell invasion, and three-dimensional migration were performed to observe cellular proliferation, migration, and invasion in vitro. The effects of miR-206 in vivo were investigated using a xenograft nude mouse model. miR-206 expression was significantly downregulated in glioma specimens. FZD7 was confirmed as a direct target of miR-206. GBM cell proliferation, migration, and invasion were blocked by restoring the expression of miR-206. Moreover, intracranial glioma models demonstrated an inhibitory effect of miR-206 on intracranial glioma tumour growth. Our results suggested that miR-206 plays a key role in blocking the WNT/β-catenin signalling pathway by suppressing FZD7 and provides a prospective therapeutic strategy for the treatment of malignant glioma and other WNT-driven tumours.

neuro-oncology

CBMT-46. MICRORNA-206 ATTENUATES GLIOMA CELL PROLIFERATION, MIGRATION, AND INVASION BY BLOCKING THE WNT/β-CATENIN PATHWAY VIA DIRECT TARGETING OF FRIZZLED 7