[No authors listed]
To determine the clinical significance of gene promoter methylation in esophageal squamous cell carcinoma (ESCC), we examined the promoter methylation status of genes showing elevated expression, as determined by DNA microarray-based transcriptomic analysis, in three ESCC cell lines (TE-1, TE-2, TE-10) after 5-aza-2'-deoxycytidine (DAC) treatment. We observed a high degree of DNA methylation within the promoter regions of three genes, namely cathepsin L2 (CTSL2), normal mucosa of esophagus specific 1 (NMES1), and fatty acid binding protein 5 (FABP5). Overexpression of NMES1 in ESCC cell lines increased cell motility. Down-regulation of NMES1 might play an important role in the cell motility of ESCC or be a potent marker of malignancy.
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