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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
07:50

Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Published on: September 18, 2020

Aberrant methylation of integrin alpha4 gene in human gastric cancer cells

Jinah Park1, Sang-Hyun Song, Tai Young Kim

  • 1National Research Laboratory for Cancer Epigenetics, Cancer Research Institute, Seoul National University College of Medicine, Seoul 110-744, Korea.

Oncogene
|March 3, 2004
PubMed

Insights

Integrin alpha4 expression loss in gastric cancer is due to DNA methylation, hindering cell adhesion. Restoring integrin alpha4 reduces cancer cell invasion, suggesting its role in gastric carcinogenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Integrins are crucial adhesion receptors involved in cell-matrix and cell-cell interactions.
  • Loss of integrin alpha4 expression is linked to metastasis in various cancers, but the underlying mechanisms remain unclear.

Purpose of the Study:

  • To investigate the molecular mechanisms behind integrin alpha4 gene silencing in human gastric cancer.
  • To determine the functional impact of integrin alpha4 restoration on gastric cancer cell invasion.

Main Methods:

  • Analysis of integrin alpha4 expression in gastric cancer cell lines and primary tumors.
  • Treatment with DNA methyltransferase inhibitors to assess expression recovery.
  • Methylation-specific PCR (MSP) and bisulfite sequencing to confirm DNA methylation.
  • Matrigel invasion assays to evaluate the effect of integrin alpha4 restoration.

Main Results:

  • Integrin alpha4 expression was lost in human gastric cancer cell lines and primary tumors.
  • Treatment with a DNA methyltransferase inhibitor restored integrin alpha4 expression, indicating transcriptional silencing via DNA methylation.
  • CpG methylation of the integrin alpha4 gene was observed in 88.8% of gastric cancer cell lines and 84.7% of primary tumors.
  • Restoration of integrin alpha4 in inactivated cells significantly reduced their extracellular matrix invasion ability.

Conclusions:

  • Aberrant DNA methylation is responsible for the transcriptional repression of the integrin alpha4 gene in gastric cancer.
  • The loss of integrin alpha4 expression due to DNA methylation may play a significant role in human gastric carcinogenesis and metastasis.

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