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• W134432452 abstract "The effects of the macromolecular synthesis inhibitors 5,6-dichloro-1-beta-D-ribofuranosyl benzimidazole (DRB), actinomycin D, and cycloheximide on the human gastric cancer TMK-1 cell line were studied. These agents inhibited DNA, RNA, or protein synthesis efficiently and induced cell death rapidly in a wide range of concentrations. After 8 hr of exposure to these agents, the cells exhibited morphological features of apoptosis, including cell shrinkage, nuclear condensation, DNA fragmentation, and formation of apoptotic bodies. Western blot analysis revealed that these inhibitors altered the protein levels of apoptosis-related gene products such as c-Myc, Bcl-X(S), and the mutant p53 (mp53) in TMK-1 cells markedly. The c-myc mRNA and protein levels were decreased initially and were then induced markedly to a new level after 4 hr of exposure to DRB, a RNA polymerase II inhibitor. The Bcl-X(S) levels were increased rapidly after treatment with all of these agents, whereas the levels of Bcl-X(L) and Bax remained largely unchanged. Northern blot analysis indicated that the c-myc overexpression is concomitant to DRB-induced DNA fragmentation and that the increased mp53 protein level was mainly a posttranscriptional event. Our observations suggest that the up-regulation of Bcl-X(S) may serve as an important mechanism for the apoptosis triggered by these inhibitors. This study also provides evidence for the notion that interference with the cellular survival pathway may lead to apoptosis." @default.
• W134432452 created "2016-06-24" @default.
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• W134432452 date "1997-04-01" @default.
• W134432452 modified "2023-09-25" @default.
• W134432452 title "Effects of transcription and translation inhibitors on a human gastric carcinoma cell line" @default.
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• W134432452 doi "https://doi.org/10.1016/s0006-2952(96)00868-4" @default.
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