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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
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DNA promoter and histone H3 methylation downregulate NGX6 in gastric cancer cells

Jian Liu1, Xinjiang Zhu, Xiaoyang Xu

  • 1Department of Gastrointedtinal Surgery and Cancer Center, The Fourth Affiliated Hospital, China Medical University, Shenyang, 110032, China.

Medical Oncology (Northwood, London, England)
|December 17, 2013
PubMed

Insights

Nasopharyngeal carcinoma-associated gene 6 (NGX6) is downregulated in gastric cancer due to promoter methylation. DNA and H3-K9 methylation, not acetylation, silence NGX6, contributing to cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Nasopharyngeal carcinoma-associated gene 6 (NGX6) is identified as a potential tumor metastasis suppressor.
  • Gastric cancer (GC) is a significant global health concern, with metastasis being a key factor in patient outcomes.

Purpose of the Study:

  • To investigate the role of DNA hypermethylation and histone modification in the silencing of NGX6 expression in gastric cancer.
  • To determine the impact of these epigenetic changes on NGX6's function as a tumor suppressor in GC.

Main Methods:

  • Analyzing NGX6 expression levels in gastric cancer cell lines and tissues.
  • Assessing DNA methylation and histone H3-K9 modifications (acetylation and methylation) at the NGX6 promoter.
  • Utilizing epigenetic modifying agents like Trichostatin A and 5'aza-2'-deoxycytidine to evaluate their effects on NGX6 expression.

Main Results:

  • NGX6 expression was significantly downregulated in all tested gastric cancer cells and a majority of tissues.
  • Silenced NGX6 loci in GC cells exhibited promoter DNA hypermethylation and H3-K9 hypermethylation, alongside H3-K9 hypoacetylation.
  • 5'aza-2'-deoxycytidine treatment reversed DNA and H3-K9 methylation, leading to NGX6 reexpression, with synergistic effects when combined with Trichostatin A.

Conclusions:

  • NGX6 expression is epigenetically silenced in gastric cancer primarily through DNA and H3-K9 promoter methylation.
  • The downregulation of NGX6 contributes to the development and progression of gastric cancer.
  • Further research is warranted to elucidate the precise mechanisms of NGX6 in gastric cancer progression.

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