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- W2440455655 abstract "To investigate the effects of 5-Aza-2'-deoxycytidine (5-Aza-dC) and trichostatin A (TSA) on DNA methylation and expression of P16, hMLH1 and MGMT genes in the human gastric cancer cell line MGC-803, and to explore the mechanism of P16, hMLH1 and MGMT gene silencing in human gastric cancer cells.MGC-803 cells were cultured in RPMI-1640 medium and were treated with 5-Aza-dC or TSA. Methylation-specific polymerase chain reaction (MS-PCR) was used to detect the promoter methylation status of P16, hMLH1 and MGMT genes. RT-PCR was used to detect the mRNA expressions of P16, hMLH1 and MGMT.Promoter hypermethylation of P16, hMLH1 and MGMT genes were detected in MGC-803 cells, and mRNA expressions of P16, hMLH1 and MGMT were absent before treatment. After treatment with 5-Aza-dC, the promoter region of the P16, hMLH1 and MGMT gene exhibited a demethylation status, and their mRNA expressions were increased. The treatment with TSA had no effects on DNA demethylation or restoration of P16 or hMLH1 expression. P16, hMLH1 and MGMT mRNA relative expression levels after treatment with a combination of 5-Aza-dC and TSA were 0.412+/-0.030, 0.397+/-0.024 and 0.553+/-0.043 respectively, which were higher than those after 5-Aza-dC treatment alone (0.221+/-0.022, 0.214+/-0.018 and 0.156+/-0.017, all P<0.05).Promoter hypermethylation is a major mechanism of P16, hMLH1 and MGMT gene silencing in human gastric cancer cells. Treatment with 5-Aza-dC alone or the combination of 5-Aza-dC and TSA can reactivate the expressions of these genes." @default.
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- W2440455655 date "2009-09-01" @default.
- W2440455655 modified "2023-09-25" @default.
- W2440455655 title "[Effects of 5-Aza-2'-deoxycytidine and trichostatin A on P16, hMLH1 and MGMT genes and DNA methylation in human gastric cancer cells]." @default.
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