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  • 标题:Delayed Expression of Apoptosis in X-irradiated Human Leukemic MOLT-4 Cells Transfected with Mutant p53.
  • 其他标题:Delayed Expression of Apoptosis in X-irradiated Human Leukemic MOLT-4 Cells Transfected with Mutant p53.
  • 本地全文:下载
  • 作者:HISAKO NAKANO ; HIROMICHI YONEKAWA ; KUNIO SHINOHARA
  • 期刊名称:Journal of Radiation Research
  • 印刷版ISSN:0449-3060
  • 电子版ISSN:1349-9157
  • 出版年度:2003
  • 卷号:44
  • 期号:2
  • 页码:179-183
  • DOI:10.1269/jrr.44.179
  • 摘要:The effects of X-rays on cell survival, apoptosis, and long-term response in the development of cell death as measured by the dye exclusion test were studied in human leukemic MOLT-4 cells (p53 wild-type) stably transfected with a mutant p53 cDNA expression vector. Cell survival, as determined from colony-forming ability, was increased in an expression level dependent manner, but the increase was partial even with the highest-expressing clone (B3). This contrasts with the prior observation that cell death and apoptosis in B3 are completely inhibited at 24 h after irradiation with 1.8 Gy of X-rays1). The examination of B3 cells incubated for longer than 24 h after X-irradiation showed a delay in the induction of cell death and apoptosis. Western blot analysis revealed that the time required to reach the highest level of wild-type p53 protein in B3 was longer than the time in MOLT-4 and that the p53 may be stabilized by the phosphorylation at Ser-15. These results suggest that the introduction of mutant p53 into MOLT-4 merely delays the development of apoptosis, during which the cells could repair the damage induced by X-rays, and results in the partial increase in cell survival.
  • 关键词:Apoptosis; Leukemia; p53; Radiation; Transfection
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