TGIF governs a feed-forward network that empowers Wnt signaling to drive mammary tumorigenesis.

TGIF governs a feed-forward network that empowers Wnt signaling to drive mammary tumorigenesis.
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TGIF 控制前馈网络,使 Wnt 信号传导驱动乳腺肿瘤发生

DOI:
10.1016/j.ccell.2015.03.002
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发表时间:
2015-04-13
期刊:
影响因子:
50.3
通讯作者:
Atfi A
Atfi A
中科院分区:
医学1区
文献类型:
--
作者:
Zhang MZ;Ferrigno O;Wang Z;Ohnishi M;Prunier C;Levy L;Razzaque M;Horne WC;Romero D;Tzivion G;Colland F;Baron R;Atfi A

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具有过度活化的Wnt信号传导的许多类型的人类癌症在该途径的已知效应物中没有显示出致病性改变。在这里,我们报告了TGIF在Wnt信号转导中的功能。TGIF与β-连环蛋白破坏复合物结合并将Axin 1和Axin 2从β-连环蛋白破坏复合物转移,因此允许β-连环蛋白累积。有趣的是,Wnt信号的激活诱导TGIF的表达,TGIF揭示了一个前馈回路,确保Wnt信号的有效整合。在三阴性乳腺癌(TNBC)中,TGIF水平升高与高Wnt信号传导和患者的低存活率相关。此外,遗传实验表明,Tgif 1消融阻碍了MMTV-Wnt 1小鼠乳腺肿瘤的发展,进一步强调了TGIF对致癌Wnt信号传导的需求。
Many types of human cancers having hyperactivated Wnt signaling display no causative alterations in known effectors of this pathway. Here, we report a function of TGIF in Wnt signaling. TGIF associates with and diverts Axin1 and Axin2 from the β-Catenin destruction complex therefore allowing β-Catenin accrual. Intriguingly, activation of Wnt signaling induces the expression of TGIF, which unveils a feed-forward loop that ensures effective integration of Wnt signaling. In triple negative breast cancers (TNBC), elevated levels of TGIF correlate with high Wnt signaling and poor survival of patients. Moreover, genetic experiments revealed that Tgif1 ablation impeded mammary tumor development in MMTV-Wnt1 mice, further underscoring a requirement of TGIF for oncogenic Wnt signaling.
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