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Low sensitivity to anticancer drugs such as 5-fluorouracil (5-FU) has been associated with decreased expression of genes involved in cell proliferation, apoptosis and metastasis. Recently, it has been shown that the expression levels of some of these genes are reduced by transcription inhibition due to epigenetic silencing on CpG islands. Therefore, epigenetic therapy has been proposed, where epigenetic silencing is repressed with DNA methyltransferase (DNMT) inhibitors and histone deacetylase (HDAC) inhibitors alone or in combination with other chemotherapeutic agents. The aim of our study was to evaluate the combination effect of 5-FU and its association with the status of epigenetic silencing using methylation-specific PCR of $p14^{ARF}$ when given with S-aza-2'-deoxycytidine (5-aza-dC), a DNMT inhibitor and depsipeptide, an HDAC inhibitor in DLD-1 human colorectal cancer cells. The combination of 5-aza-dC with depsipeptide showed a synergism and induced unmethylation of $p14^{ARF}$. However, triplet combination of 5-aza-dc/depsipeptide and 5-FU resulted in antagonistic effects and abrogated unmethylation of $p14^{ARF}$. These results suggest that unfavorable interaction of 5-aza-dC/depsipeptide with 5-FU in DLD-1 cells may be related with the failure in repression of epigenetic silencing, which warrants further investigation.
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