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- W1999577246 abstract "Pretreatment plus concomitant treatment with 10 micrograms/ml cycloheximide protected Chinese hamster ovary cells and Swiss 3T3 cells against the cytotoxicity of actinomycin D. The cycloheximide treatment reduced the intracellular concentration of actinomycin D by reducing the level of actinomycin D bound to the acid precipitable fraction of the cell. Levels of unbound actinomycin D were unaffected by cycloheximide, indicating that the plasma membrane permeability to AD was not reduced. Actinomycin D inhibited total transcription but did not reduce cytoplasmic levels of rRNA nor of most tested mRNA; however, cytoplasmic levels of c-myc mRNA were reduced below detectability. Cycloheximide treatment further inhibited total transcription and had no effect on cytoplasmic levels of rRNA nor of most tested mRNA. Cytoplasmic levels of c-myc were elevated by cycloheximide and remained so even in the presence of actinomycin D. These data suggested that a reduction in cytoplasmic levels of short lived, essential mRNA, such as c-myc mRNA, was one lethal lesion of actinomycin D. Furthermore, cycloheximide's protection may result, in part, from its ability to stabilize and/or elevate cytoplasmic levels of these mRNA, thus counteracting their depletion by actinomycin D. Protection may also result from the cycloheximide-induced reduction of actinomycin D bound to the acid precipitable fraction of the cells." @default.
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- W1999577246 date "1992-12-01" @default.
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- W1999577246 title "Cycloheximide protection against actinomycin D cytotoxicity" @default.
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- W1999577246 doi "https://doi.org/10.1002/jcp.1041530310" @default.
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