YB-1 evokes susceptibility to cancer through cytokinesis failure, mitotic dysfunction and HER2 amplification.

YB-1 evokes susceptibility to cancer through cytokinesis failure, mitotic dysfunction and HER2 amplification.
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DOI:
10.1038/onc.2011.82
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发表时间:
2011-08-25
期刊:
影响因子:
8
通讯作者:
Dunn SE
Dunn SE
中科院分区:
医学1区
文献类型:
--
作者:
Davies AH;Barrett I;Pambid MR;Hu K;Stratford AL;Freeman S;Berquin IM;Pelech S;Hieter P;Maxwell C;Dunn SE

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乳腺中Y-box结合蛋白-1(YB-1)的表达促进了乳腺癌的发生,这表明基因组高度不稳定。在本研究中,我们开发了一个癌前病变模型,以描述该基因在乳腺癌发生和早期进展中的作用。利用抗体微阵列技术研究了YB-1在人乳腺上皮细胞(HMEC)中条件性表达后信号转导的整体变化。细胞周期相关蛋白经常发生变化,其中最引人注目的是LIM激酶1/2(LIMK 1/2)。因此,LIMK 1/2的错误表达与胞质分裂失败相关,胞质分裂失败是中心体扩增的前兆。详细的研究表明YB-1以磷酸化依赖的方式定位于中心体,在那里它与中心周蛋白和γ-微管蛋白复合。这被认为是必不可少的,在保持结构的完整性和微管成核能力的细胞器。长时间暴露于YB-1导致肿瘤发生的猖獗加速,大多数细胞获得数量和结构染色体异常。由于细胞周期蛋白E的过度表达而导致的G1/S检查点的滑动促进了这些基因组受损细胞的持续增殖。随着恶性肿瘤的进一步发展,我们确定了一个子集的细胞窝藏HER 2扩增。我们的研究结果认识到YB-1是一种癌症易感基因,具有为肿瘤发生准备细胞的能力。
Y-box binding protein-1 (YB-1) expression in the mammary gland promotes breast carcinoma that demonstrates a high degree of genomic instability. In the present study, we developed a model of premalignancy to characterize the role of this gene during breast cancer initiation and early progression. Antibody microarray technology was used to ascertain global changes in signal transduction following the conditional expression of YB-1 in human mammary epithelial cells (HMEC). Cell cycle associated proteins were frequently altered with the most dramatic being LIM Kinase 1/2 (LIMK1/2). Consequently, the misexpression of LIMK1/2 was associated with cytokinesis failure that acted as a precursor to centrosome amplification. Detailed investigation revealed that YB-1 localized to the centrosome in a phosphorylation-dependent manner where it complexed with pericentrin and γ-tubulin. This was found to be essential in maintaining the structural integrity and microtubule nucleation capacity of the organelle. Prolonged exposure to YB-1 led to rampant acceleration toward tumourigenesis with the majority of cells acquiring numerical and structural chromosomal abnormalities. Slippage through the G1/S checkpoint due to overexpression of cyclin E promoted continued proliferation of these genomically compromised cells. As malignancy further progressed, we identified a subset of cells harbouring HER2 amplification. Our results recognize YB-1 as a cancer susceptibility gene with the capacity to prime cells for tumourigenesis.
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重新定义了乳腺癌的预后因素:YB-1比雌激素受体或HER-2在所有肿瘤亚型中比雌激素受体或HER-2更强的预测指标。
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作者:
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