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Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy
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Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy

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MiR-153 as a Tumor Suppressor in Glioblastoma Multiforme is Downregulated by DNA Methylation

Asghar Ghasemi, Soudabeh Fallah, Mohammad Ansari

    Clinical Laboratory
    |May 25, 2016
    PubMed
    Abstract

    Insights

    DNA hypermethylation silences tumor suppressors in glioblastoma multiforme (GBM). This study shows microRNA-153 (miR-153) is downregulated by methylation in GBM, acting as a tumor suppressor and potential therapeutic target.

    Area of Science:

    • Oncology
    • Molecular Biology
    • Epigenetics

    Background:

    • Aberrant DNA hypermethylation is a key mechanism in cancer development, silencing tumor suppressor genes.
    • MicroRNA-153 (miR-153) functions as a tumor suppressor in glioblastoma multiforme (GBM) by targeting oncogenes.
    • The regulatory mechanisms of miR-153 in glioma cells, particularly its epigenetic control, were previously uninvestigated.

    Purpose of the Study:

    • To investigate the role of DNA methylation in regulating miR-153 expression in glioblastoma multiforme (GBM).
    • To determine if miR-153 functions as a tumor suppressor in GBM and if its expression is epigenetically controlled.

    Main Methods:

    • Real-time PCR was used to quantify miR-153 expression levels.
    • Genomic bisulfite sequencing was employed to assess DNA methylation status in the miR-153 upstream region in GBM tissues and cell lines.
    • Cells were treated with 5-aza-2'-deoxycitidine (5-aza-dC) to induce demethylation and assess its effects on miR-153 expression and target proteins.

    Main Results:

    • miR-153 was found to be significantly downregulated and hypermethylated in GBM tissues compared to adjacent normal tissues.
    • A significant inverse correlation was observed between miR-153 methylation levels and its expression in GBM specimens.
    • Demethylation treatment with 5-aza-dC restored miR-153 expression and reduced its target protein levels.

    Conclusions:

    • miR-153 acts as a tumor suppressor in GBM and its downregulation is mediated by DNA hypermethylation.
    • These findings suggest that miR-153 holds potential as a diagnostic biomarker or therapeutic target for GBM.

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