Lack of p53 function promotes radiation-induced mitotic catastrophe in mouse embryonic fibroblast cells.

Lack of p53 function promotes radiation-induced mitotic catastrophe in mouse embryonic fibroblast cells.
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DOI:
10.1186/1475-2867-6-11
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发表时间:
2006-04-26
影响因子:
5.8
通讯作者:
Mackey MA
Mackey MA
中科院分区:
医学2区
文献类型:
--
作者:
Ianzini F;Bertoldo A;Kosmacek EA;Phillips SL;Mackey MA

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我们已经证明,在一些人类癌细胞中,慢性轻度热和电离辐射暴露都会诱导细胞周期的S期和G2期的短暂阻滞。在这一延迟期间,细胞周期蛋白B1积累到异常水平,细胞周期蛋白B1依赖性激酶被激活,G2/M检查点控制被取消,导致有丝分裂突变(MC)。利用野生型或突变型p53的同基因小鼠胚胎成纤维细胞(MEF),我们现在发现,虽然两种细胞系在辐照后的S/G2期均出现延迟,但突变型p53细胞的细胞周期蛋白B1水平升高,随后出现MC。而野生型p53细胞则表现出较低的细胞周期蛋白B1积累和较低的MC频率。这些结果与报道p53作为细胞周期蛋白B1蛋白转录后调节剂的作用一致,并证实细胞周期蛋白B1的失调促进了辐射诱导的MC。这些发现可能用于设计策略来增加抗辐射诱导凋亡的肿瘤细胞中MC的产量。
We have demonstrated that in some human cancer cells both chronic mild heat and ionizing radiation exposures induce a transient block in S and G2 phases of the cell cycle. During this delay, cyclin B1 protein accumulates to supranormal levels, cyclin B1-dependent kinase is activated, and abrogation of the G2/M checkpoint control occurs resulting in mitotic catastrophe (MC). Using syngenic mouse embryonic fibroblasts (MEF) with wild-type or mutant p53, we now show that, while both cell lines exhibit delays in S/G2 phase post-irradiation, the mutant p53 cells show elevated levels of cyclin B1 followed by MC, while the wild-type p53 cells present both a lower accumulation of cyclin B1 and a lower frequency of MC. These results are in line with studies reporting the role of p53 as a post-transcriptional regulator of cyclin B1 protein and confirm that dysregulation of cyclin B1 promote radiation-induced MC. These findings might be exploited to design strategies to augment the yield of MC in tumor cells that are resistant to radiation-induced apoptosis.
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