Caspase-2 regulates S-phase cell cycle events to protect from DNA damage accumulation independent of apoptosis.

Caspase-2 regulates S-phase cell cycle events to protect from DNA damage accumulation independent of apoptosis.
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caspase-2调节S期细胞周期事件,以防止与凋亡无关的DNA损伤积累。

DOI:
10.1038/s41388-021-02085-w
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发表时间:
2022-01
期刊:
影响因子:
8
通讯作者:
Bouchier-Hayes L
Bouchier-Hayes L
中科院分区:
医学1区
文献类型:
--
作者:
Boice AG;Lopez KE;Pandita RK;Parsons MJ;Charendoff CI;Charaka V;Carisey AF;Pandita TK;Bouchier-Hayes L

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除了其在细胞凋亡中的经典作用外,越来越多的证据表明caspase-2具有非凋亡功能,包括调节细胞分裂。已知caspase-2的缺失会增加增殖率,但目前尚不清楚caspase-2如何调节这一过程。我们发现,caspase-2在细胞周期的G1期分裂细胞中被激活。在没有半胱天冬酶-2的情况下,细胞表现出许多S期缺陷,包括从S期延迟退出,S期期间染色体畸变修复缺陷,以及S期停滞后DNA损伤增加。此外,半胱天冬酶-2缺陷细胞具有更高频率的停滞复制叉,减少DNA纤维长度,并阻碍DNA复制道的进展。这表明caspase-2保护免受复制应激并促进复制叉保护以维持基因组稳定性。这些功能独立于caspase-2的促凋亡功能,因为阻断caspase-2诱导的细胞死亡对细胞分裂、DNA损伤诱导的细胞周期停滞或DNA损伤没有影响。因此,我们的数据支持一个模型,其中caspase-2调节细胞周期和DNA修复事件,以防止DNA损伤的积累,独立于其促凋亡功能。
In addition to its classical role in apoptosis, accumulating evidence suggests that caspase-2 has non-apoptotic functions, including regulation of cell division. Loss of caspase-2 is known to increase proliferation rates but how caspase-2 is regulating this process is currently unclear. We show that caspase-2 is activated in dividing cells in G1-phase of the cell cycle. In the absence of caspase-2, cells exhibit numerous S-phase defects including delayed exit from S-phase, defects in repair of chromosomal aberrations during S-phase, and increased DNA damage following S-phase arrest. In addition, caspase-2-deficient cells have a higher frequency of stalled replication forks, decreased DNA fiber length, and impeded progression of DNA replication tracts. This indicates that caspase-2 protects from replication stress and promotes replication fork protection to maintain genomic stability. These functions are independent of the pro-apoptotic function of caspase-2 because blocking caspase-2-induced cell death had no effect on cell division, DNA damage-induced cell cycle arrest, or DNA damage. Thus, our data supports a model where caspase-2 regulates cell cycle and DNA repair events to protect from the accumulation of DNA damage independently of its pro-apoptotic function.
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