Aurora kinase-A inactivates DNA damage-induced apoptosis and spindle assembly checkpoint response functions of p73.

Aurora kinase-A inactivates DNA damage-induced apoptosis and spindle assembly checkpoint response functions of p73.
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DOI:
10.1016/j.ccr.2011.12.025
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发表时间:
2012-02-14
期刊:
影响因子:
50.3
通讯作者:
Sen S
Sen S
中科院分区:
医学1区
文献类型:
--
作者:
Katayama H;Wang J;Treekitkarnmongkol W;Kawai H;Sasai K;Zhang H;Wang H;Adams HP;Jiang S;Chakraborty SN;Suzuki F;Arlinghaus RB;Liu J;Mobley JA;Grizzle WE;Wang H;Sen S

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极光激酶 A 表达升高与人类肿瘤细胞中 DNA 损伤诱导的细胞凋亡反应的消除和有丝分裂纺锤体组装检查点 (SAC) 覆盖相关。我们报道,p73 丝氨酸 235 处的 Aurora-A 磷酸化消除了其反式激活功能,并导致与伴侣蛋白 mortalin 形成复合物的细胞质隔离。 Aurora-A 磷酸化的 p73 还通过在经历有丝分裂的细胞中解离 MAD2-CDC20 复合物来促进 SAC 失活。表达 p73 磷模拟突变体 (S235D) 的细胞表现出生长特性改变、对顺铂诱导的细胞凋亡的抗性、以及 MAD2-CDC20 复合物的过早解离,以及在纺锤体损伤存在的情况下加速有丝分裂退出和 SAC 覆盖。在过表达 Aurora-A 的原发性人类肿瘤中,细胞质 p​​73 升高证实了实验结果。
Elevated Aurora kinase-A expression is correlated with abrogation of DNA damage induced apoptotic response and mitotic spindle assembly checkpoint (SAC) override in human tumor cells. We report that Aurora-A phosphorylation of p73 at serine235 abrogates its transactivation function and causes cytoplasmic sequestration in a complex with the chaperon protein mortalin. Aurora-A phosphorylated p73 also facilitates inactivation of SAC through dissociation of the MAD2-CDC20 complex in cells undergoing mitosis. Cells expressing phosphor-mimetic mutant (S235D) of p73 manifest altered growth properties, resistance to cisplatin induced apoptosis, as well as premature dissociation of the MAD2-CDC20 complex, and accelerated mitotic exit with SAC override in the presence of spindle damage. Elevated cytoplasmic p73 in Aurora-A overexpressing primary human tumors corroborates the experimental findings.
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