ATM is activated by default in mitosis, localizes at centrosomes and monitors mitotic spindle integrity

被引:58
作者
Oricchio, E
Saladino, C
Iacovelli, S
Soddu, S
Cundari, E
机构
[1] CNR, Inst Biol & Mol Pathol, I-00185 Rome, Italy
[2] Regina Elena Inst Canc Res, Dept Expt Oncol, Rome, Italy
关键词
ATM; p53; centrosomes; mitosis; post-mitotic checkpoint; phosphorylation;
D O I
10.4161/cc.5.1.2269
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
We previously showed that ATM is responsible for p53 phosphorylation at Ser15 and localization at centrosomes during mitosis. When p53 centrosomal localization is prevented by inhibiting polymerization of spindle microtubules, a stabilized form of p53 is transmitted to daughter cells that arrest in the next G(1) phase of the cell cycle after exit from mitosis. AT cells are unable to both localize p53 at centrosomes in mitosis and arrest after exposure to mitotic-spindle poisons. Here we show that during mitosis ATM is activated by phosphorylation at Ser1981 and localizes at centrosomes. When mitotic spindle is disrupted by nocodazole, ATM is displaced from centrosomes and colocalizes with phospho-Ser15-p53 under the form of spots dispersed in the mitotic cytoplasm. After release from nocodazole-block, as soon as cells exit mitosis, p53 is redirected to the nucleus and its Ser15 phosphorylation is substituted by phosphorylation at Ser46. We suggest that ATM is activated by default at each mitotic onset and phosphorylates p53 at Ser15 so as to keep it inactive at centrosomes when the spindle is correctly in place or, in case of inactivation of the mitotic spindle, to maintain the memory of a perturbed mitosis.
引用
收藏
页码:88 / 92
页数:5
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