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- W2140504243 abstract "The methylation inhibitors Neplanocin A (Nep A), 3′-deazaadenosine (dzAdo), and 3-deaza(±)aristeromycin (Dari) were tested for their effect on the expression of histone H2B, actin, and the protooncogenes c-myc, and v-fos. Nep A and Dari bind to the S-adenosylhomocysteine hydrolase resulting in the accumulation of S-adenosylhomocysteine, while dzAdo served as a substrate for the enzyme. With dzAdo, inordinant amounts of 3-deazaadenosylhomocysteine (dzAdoHcy) accumulated in the cell, provided L-homocysteine (Hey) was present. When added at sublethal concentrations, the methylation inhibitors had little or no effect on c-myc, v-fos, histone H2B, or actin expression, nor did any significant number of the drug-treated cells demonstrate myeloid characteristics. However, growth and gene expression were markedly inhibited upon the addition of Hey and dzAdo. One of the earliest effects of dzAdoHcy on HL-60 cells was the disappearance of c-myc mRNA. Within 1 h of the addition of dzAdo and Hey, only trace amounts of c-myc mRNA were detectable. After 4–5 h v-fos, histone H2B, and actin mRNAs also decreased to about 40% of control levels. Differences in the stability of preexisting mRNAs would appear to account for these results. Within 1 h following the addition of dzAdo and Hey, the synthesis of rRNA and mRNA were completely blocked as measured by the incorporation of [ 3 H]uridine.Key words: methylation inhibitors, 3-deazaadenosine, c-myc, HL-60 cells, gene expression, RNA." @default.
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- W2140504243 date "1992-08-01" @default.
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- W2140504243 title "Effect of methylation inhibitors on gene expression in HL-60 cells" @default.
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- W2140504243 doi "https://doi.org/10.1139/o92-107" @default.
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