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- W2114987890 abstract "Depsipeptide (FK228), a histone deacetylase inhibitor, is a promising new anticancer agent. The mechanism of resistance to this agent was studied using KU812 cells. Depsipeptide-resistant KU812 cells expressed P-glycoprotein (P-gp) and their resistance was abolished by co-treatment with verapamil. P-gp expression returned to the parental cell level when resistant cells were cultured in depsipeptide-free medium, while resistant cells cultured in the medium containing 16 nM depsipeptide still showed hyper-acetylation of histones. Moreover, resistant cells showed erythroid differentiation. Microarray analysis revealed that 28 genes showed increased expression and three genes showed decreased expression in resistant cells compared with parental cells. These 31 genes had various functions relating to signal transduction, cell cycle, apoptosis, and control of cell morphology and differentiation. Among the 28 genes that were upregulated, 15 genes also showed an increased expression in parental cells treated with 4 nM depsipeptide for 48 h, while the other 13 genes including P-gp were different. Among the three genes with decreased expression, HEP27 was most dramatically downregulated. These findings suggest that continuous exposure to depsipeptide reversibly induces P-gp, which contributes to the onset of resistance, but the altered gene expression profile of resistant cells may also play a role." @default.
- W2114987890 created "2016-06-24" @default.
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- W2114987890 date "2006-06-01" @default.
- W2114987890 modified "2023-10-16" @default.
- W2114987890 title "Depsipeptide-resistant KU812 cells show reversible P-glycoprotein expression, hyper-acetylated histones, and modulated gene expression profile" @default.
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- W2114987890 doi "https://doi.org/10.1016/j.leukres.2005.09.014" @default.
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