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Related Concept Videos

  • Biomedical And Clinical Sciences
  • Oncology And Carcinogenesis
  • Predictive And Prognostic Markers
  • Microrna-18a Prevents Estrogen Receptor-alpha Expression, Promoting Proliferation Of Hepatocellular Carcinoma Cells.
  • Biomedical And Clinical Sciences
  • Oncology And Carcinogenesis
  • Predictive And Prognostic Markers
  • Microrna-18a Prevents Estrogen Receptor-alpha Expression, Promoting Proliferation Of Hepatocellular Carcinoma Cells.

    • Related Experiment Videos

    MicroRNA-18a prevents estrogen receptor-alpha expression, promoting proliferation of hepatocellular carcinoma cells.

    Wan-Hsin Liu1, Shiou-Hwei Yeh, Cho-Chun Lu

    • 1Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan.

    Gastroenterology
    |November 26, 2008

    View abstract on PubMed

    Summary
    This summary is machine-generated.

    MicroRNA-18a (miR-18a) is elevated in female liver cancer patients, repressing estrogen receptor alpha and potentially promoting tumor growth. This finding reveals a novel mechanism in hepatocellular carcinoma (HCC) development.

    Related Experiment Videos

    Area of Science:

    • Molecular Biology
    • Oncology
    • Genetics

    Background:

    • Hepatocellular carcinoma (HCC) incidence is higher in men than women.
    • Estrogen is believed to offer protective effects against HCC.
    • Differences in microRNA (miRNA) expression between sexes in HCC warrant investigation.

    Purpose of the Study:

    • To investigate sex-based differences in miRNA expression in hepatocellular carcinoma (HCC) samples.
    • To identify specific miRNAs and their targets involved in HCC pathogenesis.
    • To elucidate the role of miRNAs in regulating estrogen receptor (ER) signaling in HCC.

    Main Methods:

    • Compared miRNA expression profiles in male and female HCC tissues using TaqMan miRNA assay.
    • Utilized luciferase reporter assay to identify miRNA targets.
    • Quantified pri- and pre-miRNA levels via quantitative reverse-transcription polymerase chain reaction.
    • Assessed the impact of miRNA overexpression on hepatoma cell proliferation.

    Main Results:

    • miR-18a expression was significantly higher in female HCC samples compared to male samples.
    • The estrogen receptor alpha (ERalpha) gene (ESR1) was identified as a target of miR-18a.
    • miR-18a represses ERalpha translation and is associated with reduced ERalpha levels in female HCC.
    • Overexpression of miR-18a decreased ERalpha levels and stimulated hepatoma cell proliferation.

    Conclusions:

    • Identified a novel miRNA-mediated regulatory pathway for ERalpha expression in hepatocytes.
    • miR-18a may promote HCC development in women by inhibiting ERalpha translation and blocking estrogen's protective effects.