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학술저널
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한국분자세포생물학회 Molecules and Cells Molecules and Cells 제33권 제2호
발행연도
2012.1
수록면
127 - 133 (7page)

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Epigenetic methylation change is a major process that occurs during cancer development. Even though many tumor-related genes have been identified based on their relationship between methylation and expression, few studies have been conducted to investigate the relevant biological pathways involved in these changes. To identify essential pathways likely to be affected by methylation in breast cancer, we examined a pool of genes in which expression was upregulated after induction of demethy-lation by 5-Aza-2'-deoxycytidine (Aza) in the MCF-7 breast cancer cell line. Genome-wide demethylation was confir-med by monitoring the demethylation of a previously known gene, SULT1A1. Overall, 210 and 213 genes were found to be upregulated and downregulated (fold change > 2), respectively, in common in cells treated with 5 and 10 M of Aza. Network analysis of these 423 genes with altered expression patterns identified the involvement of a cancer related network of genes that were heavily regulated by TNF-alpha in breast tumorigenesis. Our results suggest that epigenetic dysregulation of cellular processes relevant to TNF-alpha-dependent apoptosis may be intimately involved in tumorigenesis in MCF-7 cells.

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