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The transcriptional factor Snail simultaneously triggers cell cycle arrest and migration of human hepatoma HepG2

Chi-Tan Hu1, Jia-Ru Wu, Tsu Yao Chang

  • 1Research Centre for Hepatology, Department of Internal Medicine, Buddhist Tzu Chi General Hospital and Tzu Chi University, Hualien, Taiwan.

Journal of Biomedical Science
|January 10, 2008
PubMed

Insights

Snail, a key factor in tumor metastasis, drives hepatoma cell migration and EMT. Inhibiting Snail prevents these effects and influences E-cadherin and p15(INK4b) expression, suggesting Snail

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Snail is recognized as a critical transcriptional factor in tumor metastasis.
  • Hepatoma cells (HepG2) are a relevant model for studying liver cancer progression.

Purpose of the Study:

  • To investigate the role of Snail in regulating cell migration, epithelial-mesenchymal transition (EMT), and gene expression in hepatoma cells.
  • To elucidate the mechanism by which Snail influences E-cadherin and p15(INK4b) expression and promoter activity.

Main Methods:

  • Real-time RT/PCR and Western blot analysis to measure Snail mRNA and protein levels.
  • Antisense oligodeoxynucleotide and siRNA techniques to block Snail gene expression.
  • Overexpression of Snail in HepG2 cells (S7 and S15 clones) to assess its effects.
  • Analysis of cell morphology, motility, cell cycle, E-cadherin and p15(INK4b) expression, and promoter activity.

Main Results:

  • 12-O-tetradecanoylphorbol-13-acetate (TPA) induced Snail expression, promoting EMT, cell migration, and inhibiting growth in HepG2 cells.
  • Snail blockade prevented TPA-induced EMT, migration, and altered E-cadherin and p15(INK4b) levels, also inhibiting TPA-triggered p15(INK4b) promoter activation.
  • Snail overexpression in HepG2 cells led to fibroblastic morphology, increased motility, altered cell cycle distribution, decreased E-cadherin, increased p15(INK4b) expression, and enhanced p15(INK4b) promoter activity.

Conclusions:

  • Snail plays diverse trans-regulatory roles in hepatoma cells, influencing cell migration, EMT, and cell cycle progression.
  • Snail directly upregulates p15(INK4b) gene expression by activating its promoter, highlighting a novel regulatory mechanism in cancer.

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