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Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis
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Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis

Published on: March 30, 2019

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MiR-34a suppresses HNSCC growth through modulating cell cycle arrest and senescence

Y Wang, J Chen, X Chen

    Neoplasma
    |May 10, 2017
    PubMed

    Insights

    MicroRNA-34a (miR-34a) suppresses head and neck squamous cell carcinoma (HNSCC) growth by inducing cell cycle arrest and senescence. Hypoxia and HIF1α negatively regulate miR-34a, while FUT1, AXL, and MAP2K1 are identified as novel targets.

    Area of Science:

    • Oncology
    • Molecular Biology
    • Gene Regulation

    Background:

    • MicroRNA-34a (miR-34a) is recognized as a tumor suppressor across various cancers.
    • Its precise function in head and neck squamous cell carcinoma (HNSCC) proliferation and its target genes remain incompletely understood.

    Purpose of the Study:

    • To investigate the role of miR-34a in HNSCC proliferation and cell cycle regulation.
    • To identify novel target genes of miR-34a in HNSCC.
    • To explore the interplay between hypoxia, HIF1α, and miR-34a in HNSCC.

    Main Methods:

    • Forced expression of miR-34a to assess its effects on cell cycle and senescence.
    • Analysis of miR-34a expression correlation with hypoxia/HIF1α in HNSCC tissues.
    • mRNA microarray to screen differentially expressed genes mediated by miR-34a.
    • Quantitative PCR (qPCR) and luciferase assays to validate novel miR-34a targets.

    Main Results:

    • Forced miR-34a expression induced cell cycle arrest and senescence in HNSCC cells.
    • Hypoxia/HIF1α negatively correlated with miR-34a expression and partially reversed miR-34a-induced senescence.
    • mRNA microarray identified 91 co-downregulated genes associated with MAPK, ErbB, and p53 pathways.
    • FUT1, AXL, and MAP2K1 were confirmed as direct targets of miR-34a.

    Conclusions:

    • MiR-34a functions as a crucial tumor suppressor in HNSCC by inducing cell cycle arrest and senescence.
    • Targeting proliferation-associated genes, including FUT1, AXL, and MAP2K1, mediates miR-34a's tumor-suppressive effects.
    • Hypoxia/HIF1α signaling represents a mechanism that can counteract miR-34a's tumor-suppressive activity in HNSCC.
    Keywords:
    cell proliferation senescence.head and neck squamous cell carcinomamiR-34a

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