[Effect of Decitabine on DKK1 Gene Demethylation in Leukemia Cells]

To explore the effect of decitabine on Dickkopf-1 (DKK1) gene expression level and its downstream Wnt signaling pathway in acute myeloid leukemia (AML) cell line HL-60.Flow cytometry and DNA ladder analysis were performed to detect apoptosis in HL-60 cell treated with different concentration of decitabine. Methylation-specific polymerase chain reaction (MS-PCR) was used to examine the methylation status of DKK1 gene. The expressions of mRNA and protein were determined by qRT-PCR and Western blot, respectively.Flow cytometric detection showed that after treating HL-60 cell line with decitabine of different concentrations for 48 h, the early apoptosis of HL-60 cells increased significantly as compared with control group (P0.05). DNA ladder analysis showed that the DNA ladder and demethylation of DKK1 gene appeared. RT-PCR and Western blot showed that the expressions of mRNA and protein increased. The protein expressions of β-catenin and C-MYC decreased.The decitabine can promote the apoptosis of HL-60 cells throngh demethylation of DDK1 gene and inhibition of Wnt signalling pathway.