FoxM1 promotes β-catenin nuclear localization and controls Wnt target-gene expression and glioma tumorigenesis.

FoxM1 promotes β-catenin nuclear localization and controls Wnt target-gene expression and glioma tumorigenesis.
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DOI:
10.1016/j.ccr.2011.08.016
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发表时间:
2011-10-18
期刊:
影响因子:
50.3
通讯作者:
Huang S
Huang S
中科院分区:
医学1区
文献类型:
--
作者:
Zhang N;Wei P;Gong A;Chiu WT;Lee HT;Colman H;Huang H;Xue J;Liu M;Wang Y;Sawaya R;Xie K;Yung WK;Medema RH;He X;Huang S

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Wnt/β-catenin信号转导在干细胞调控和肿瘤发生中是必不可少的,但其分子机制尚未完全了解。在这里,我们报告说,FoxM 1是Wnt信号的下游组件,是关键的β-连环蛋白在肿瘤细胞中的转录功能。Wnt 3a增加FoxM 1的水平和核转位,FoxM 1直接结合β-catenin并增强β-catenin核定位和转录活性。永生化神经干细胞中FoxM 1的基因缺失消除了β-连环蛋白的核定位。破坏FoxM 1-β-catenin相互作用或FoxM 1核输入的FoxM 1突变阻止β-catenin在肿瘤细胞中的核积累。FoxM 1-β-catenin相互作用控制Wnt靶基因的表达,是胶质瘤形成所必需的,代表了肿瘤发生过程中经典Wnt信号传导的机制。
Wnt/β-catenin signaling is essential for stem cell regulation and tumorigenesis, but its molecular mechanisms are not fully understood. Here, we report that FoxM1 is a downstream component of Wnt signaling and is critical for β-catenin transcriptional function in tumor cells. Wnt3a increases the level and nuclear translocation of FoxM1, which binds directly to β-catenin and enhances β-catenin nuclear localization and transcriptional activity. Genetic deletion of FoxM1 in immortalized neural stem cells abolishes β-catenin nuclear localization. FoxM1 mutations that disrupt the FoxM1–β-catenin interaction or FoxM1 nuclear import prevent β-catenin nuclear accumulation in tumor cells. FoxM1–β-catenin interaction controls Wnt target gene expression and is required for glioma formation, and represents a mechanism for canonical Wnt signaling during tumorigenesis.
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