Mitotic death: A mechanism of survival? A review

被引：109

作者：

Erenpreisa J. ^{[1
]}

Cragg M.S. ^{[2
]}

机构：

[1] Laboratory of Tumour Cell Biology, Biomedicine Centre, Latvian University, Latvia

[2] Tenovus Research Laboratory, Cancer Sciences Division, Southampton University, Southampton

来源：

Cancer Cell International | / 1卷 / 1期

关键词：

Sister Chromatid; Mitotic Cycle; Spindle Checkpoint; Mitotic Catastrophe; Genotoxic Damage;

D O I：

10.1186/1475-2867-1-1

中图分类号：

学科分类号：

摘要：

Mitotic death is a delayed response of p53 mutant tumours that are resistant to genotoxic damage. Questions surround why this response is so delayed and how its mechanisms serve a survival function. After uncoupling apoptosis from G1 and S phase arrests and adapting these checkpoints, p53 mutated tumour cells arrive at the G2 compartment where decisions regarding survival and death are made. Missed or insufficient DNA repair in G1 and S phases after severe genotoxic damage results in cells arriving in G2 with an accumulation of point mutations and chromosome breaks. Double strand breaks can be repaired by homologous recombination during G2 arrest. However, cells with excessive chromosome lesions either directly bypass the G2/M checkpoint, starting endocycles from G2 arrest, or are subsequently detected by the spindle checkpoint and present with the features of mitotic death. These complex features include apoptosis from metaphase and mitosis restitution, the latter of which can also facilitate transient endocycles, producing endopolyploid cells. The ability of cells to initiate endocycles during G2 arrest and mitosis restitution most likely reflects their similar molecular environments, with down-regulated mitosis promoting factor activity. Resulting endocycling cells have the ability to repair damaged DNA, and although mostly reproductively dead, in some cases give rise to mitotic progeny. We conclude that the features of mitotic death do not simply represent aberrations of dying cells but are indicative of a switch to amitotic modes of cell survival that may provide additional mechanisms of genotoxic resistance. © 2001 Erenpreisa and Cragg; licensee BioMed Central Ltd.

引用

页数：7

共 78 条

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