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• W2012334452 abstract "The genetic and epigenetic events of hepato-carcinogenesis are relatively poorly understood. By analyzing genes from human hepatocellular carcinoma (HCC) with restriction landmark genomic scanning, several aberrantly methylated genes, including Delta-like 3 (DLL3), have been isolated. In this study, we investigated the function of DLL3 in hepatocarcinogenesis. Methylation of the DLL3 gene in HCC cell lines was investigated with methylation-specific PCR and expression of DLL3 mRNA in HCC cells was examined by RT-PCR. Reactivation of DLL3 expression by treatment with a demethylating agent was examined in methylation-silenced HuH2 cells. Human DLL3 cDNA was cloned and DLL3 function was examined by restoring DLL3 expression in HuH2 cells. The effects of DLL3 on cell growth were evaluated by colony formation assay. Induction of cell death by overexpression of DLL3 was examined by flow cytometric assay using Annexin V and PI. Apoptotic cells were detected by TUNEL staining and the amount of single-stranded DNA was measured by ELISA. As a result, the promoter region of the DLL3 gene was methylated in four of ten HCC cell lines. This aberrant methyl-ation correlated well with the suppression of RNA expression and a demethylating agent reactivated DLL3 expression in methylation-silenced HCC cells. Interestingly, the restoration of DLL3 in the methylation-silenced HuH2 cells led to growth suppression on colony formation assay. Flow cytometric assay with Annexin V and PI showed that this growth suppression by DLL3 expression is associated with the induction of apoptosis. Furthermore, these apoptotic effects were confirmed by TUNEL staining and measurement of single-stranded DNA. These results suggest that DLL3 was silenced by methylation in human HCC and that it negatively regulates the growth of HCC cells." @default.
• W2012334452 created "2016-06-24" @default.
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• W2012334452 date "2013-01-17" @default.
• W2012334452 modified "2023-09-30" @default.
• W2012334452 title "Delta-like 3 is silenced by methylation and induces apoptosis in human hepatocellular carcinoma" @default.
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• W2012334452 doi "https://doi.org/10.3892/ijo.2013.1778" @default.
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