Plk1 overexpression induces chromosomal instability and suppresses tumor development.

Plk1 overexpression induces chromosomal instability and suppresses tumor development.
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PLK1的过表达诱导染色体不稳定性并抑制肿瘤的发育。

DOI:
10.1038/s41467-018-05429-5
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发表时间:
2018-08-01
影响因子:
16.6
通讯作者:
Sotillo R
Sotillo R
中科院分区:
综合性期刊1区
文献类型:
--
作者:
de Cárcer G;Venkateswaran SV;Salgueiro L;El Bakkali A;Somogyi K;Rowald K;Montañés P;Sanclemente M;Escobar B;de Martino A;McGranahan N;Malumbres M;Sotillo R

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Polo样激酶1(Plk 1)在多种人类肿瘤中过度表达,常被认为是一种癌基因和一个有吸引力的肿瘤靶点。然而,其对肿瘤发展的贡献尚不清楚。使用一种新的诱导型基因敲入小鼠模型,我们在这里报告,Plk 1过表达的结果异常染色体分离和胞质分裂,产生多倍体细胞的增殖潜力降低。从机制上讲,这些胞质分裂缺陷与Cep 55和ESCRT复合物以Plk 1激酶依赖性方式加载到分裂桥的缺陷相关。在体内,Plk 1过表达防止Kras诱导和Her 2诱导的乳腺肿瘤的发展,在染色体不稳定性的增加率的存在下。在患者中,Plk 1过表达与特定乳腺癌亚型的生存率提高相关。因此,尽管由于Plk 1在肿瘤细胞周期中的重要作用而抑制Plk 1具有治疗益处,但Plk 1过表达通过干扰有丝分裂进程和胞质分裂而具有肿瘤抑制特性。PLK 1是一种在癌症中过表达的有丝分裂调节因子;然而,这种过表达是否会导致肿瘤的发展尚不清楚。在这里,作者建立了一个诱导型小鼠模型来过度表达PLK 1,并表明实际上这可以通过干扰有丝分裂进程和胞质分裂来作为肿瘤抑制因子。
Polo-like kinase 1 (Plk1) is overexpressed in a wide spectrum of human tumors, being frequently considered as an oncogene and an attractive cancer target. However, its contribution to tumor development is unclear. Using a new inducible knock-in mouse model we report here that Plk1 overexpression results in abnormal chromosome segregation and cytokinesis, generating polyploid cells with reduced proliferative potential. Mechanistically, these cytokinesis defects correlate with defective loading of Cep55 and ESCRT complexes to the abscission bridge, in a Plk1 kinase-dependent manner. In vivo, Plk1 overexpression prevents the development of Kras-induced and Her2-induced mammary gland tumors, in the presence of increased rates of chromosome instability. In patients, Plk1 overexpression correlates with improved survival in specific breast cancer subtypes. Therefore, despite the therapeutic benefits of inhibiting Plk1 due to its essential role in tumor cell cycles, Plk1 overexpression has tumor-suppressive properties by perturbing mitotic progression and cytokinesis. PLK1 is a mitotic regulator overexpressed in cancer; however, whether this overexpression causally contributes to tumor development is unclear. Here the authors produce an inducible mouse model to overexpress PLK1 and show that actually this can act as a tumor suppressor by perturbing mitotic progression and cytokinesis.
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