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UNCOUPLING OF S PHASE AND MITOSIS INDUCED BY ANTICANCER AGENTS IN CELLS LACKING P21

机译:缺少P21的细胞中抗癌剂诱导的S相和有丝分裂的解偶联

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摘要

PRECISE coordination of the S and M phases of the eukaryotic cell cycle is critical not only for normal cell division, but also for effective growth arrest under conditions of stress. When damaged, a cell must communicate signals to both the mitotic and DNA synthesis machineries so that a mitotic block is not followed by an extra S phase, or vice versa. The biochemical mechanisms regulating this coordination, termed checkpoints, have been identified in lower eukaryotes, but are largely unknown in mammalian cells(1-3). Here we show that p21(WAF1/CIP1), the prototype inhibitor of cyclin-dependent kinases (CDKs)(4), is required for this coordination in human cells. In the absence of p21, DNA-damaged cells arrest in a G2-like state, but then undergo additional S phases without intervening normal mitoses. They thereby acquire grossly deformed, polyploid nuclei and subsequently die through apoptosis. Perhaps not by coincidence, the DNA-damaging agents that can cause S/M uncoupling are used in the clinic to kill cancer cells preferentially. [References: 28]
机译:真核细胞周期S和M期的精确协调不仅对于正常的细胞分裂至关重要,而且对于在压力条件下有效的生长停滞也至关重要。当细胞受损时,细胞必须将信号传递给有丝分裂和DNA合成机器,这样就不会在有丝分裂阻滞之后出现额外的S期,反之亦然。在低等真核生物中已经确定了调节这种协调作用的生化机制,称为检查点,但在哺乳动物细胞中却鲜为人知(1-3)。在这里,我们显示了p21(WAF1 / CIP1),细胞周期蛋白依赖性激酶(CDKs)(4)的原型抑制剂,对于人体细胞的这种协调作用是必需的。在没有p21的情况下,DNA损伤的细胞以G2样状态停滞,但随后经历了另外的S期,而没有干扰正常的有丝分裂。因此,它们获得了严重变形的多倍体核,随后因凋亡而死亡。可能并非偶然的是,可导致S / M解偶联的DNA破坏剂在临床中被优先使用,以杀死癌细胞。 [参考:28]

著录项

  • 来源
    《Nature》 |1996年第6584期|p. 713-716|共4页
  • 作者单位

    JOHNS HOPKINS ONCOL CTR HOWARD HUGHES MED INST 424 N BOND ST BALTIMORE MD 21231 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

    Cycle; Insitu;

    机译:循环;原位;

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