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- W3186291610 abstract "Abstract Background: Gliomas are the most malignant and common tumors in human brains, and the prognosis of glioma patient is very poor. MicroRNAs (miRNAs) play critical roles in different types of cancer by performing posttranscriptional regulation of gene expression. Although miR-218 has been demonstrated decreased in gliomas, its role in gliomas still remains largely unknown. Methods: MiR-218 expression were analyzed in gliomas and normal brain tissues (control subjects) using TCGA dataset. A series of in vitro and in vivo studies was performed to determine the biological roles of miR-218 in glioma cells. Potential targets of miR-218 were identified using dual-luciferase reporter system. Western blot and dual-luciferase reporter system were performed to evaluate the regulatory effect of miR-218 on TNC/AKT/AP-1/TGFβ1 pathway. Results: We demonstrated miR-218 was significantly downregulated in gliomas compared to control subjects, and played potent tumor suppressor roles in glioma cells by inhibited cell proliferation, colony formation, migration, invasion and tumorigenic potential in nude mice, as well as inducing cell cycle arrest and apoptosis.Mechanistically, miR-218 inhibited malignant phenotypes of glioma cells by binding to the 3’ UTR of its target TNC and subsequently repressing its expression. As a result, it could reduce AKT phosphorylation and subsequently inhibit transcriptional activity of AP-1 by reducing JNK phosphorylation, downregulating the expression of TGFβ1, while TGFβ1 is able to, in turn, activate the TNC/AKT/AP-1 signaling axis. Conclusions: Our data uncover a previously unknown tumor suppressor role of miR-218 by blocking the TNC/AKT/AP-1/TGFβ1 positive feedback loop in glioma." @default.
- W3186291610 created "2021-08-02" @default.
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- W3186291610 date "2020-04-15" @default.
- W3186291610 modified "2023-10-16" @default.
- W3186291610 title "MiR-218 inhibits malignant phenotypes of glioma by targeting TNC/AKT/AP-1/TGFβ1 feedback signaling loop" @default.
- W3186291610 doi "https://doi.org/10.21203/rs.3.rs-16349/v2" @default.
- W3186291610 hasPublicationYear "2020" @default.
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