FBXW2 suppresses migration and invasion of lung cancer cells via promoting β-catenin ubiquitylation and degradation

Fei Yang, Jie Xu, Hua Li, Mingjia Tan, Xiufang Xiong and Yi Sun ()
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Fei Yang: Zhejiang University School of Medicine
Jie Xu: University of Michigan
Hua Li: University of Michigan
Mingjia Tan: University of Michigan
Xiufang Xiong: Zhejiang University School of Medicine
Yi Sun: Zhejiang University School of Medicine

Nature Communications, 2019, vol. 10, issue 1, 1-16

Abstract: Abstract FBXW2 inhibits proliferation of lung cancer cells by targeting SKP2 for degradation. Whether and how FBXW2 regulates tumor invasion and metastasis is previously unknown. Here, we report that FBXW2 is an E3 ligase for β-catenin. FBXW2 binds to β-catenin upon EGF-AKT1-mediated phosphorylation on Ser552, and promotes its ubiquitylation and degradation. FBXW2 overexpression reduces β-catenin levels and protein half-life, whereas FBXW2 knockdown increases β-catenin levels, protein half-life and transcriptional activity. Functionally, FBXW2 overexpression inhibits migration and invasion by blocking transactivation of MMPs driven by β-catenin, whereas FXBW2 knockdown promotes migration, invasion and metastasis both in vitro and in vivo lung cancer models. In human lung cancer specimens, while FBXW2 levels are inversely correlated with β-catenin levels and lymph-node metastasis, lower FBXW2 coupled with higher β-catenin, predict a worse patient survival. Collectively, our study demonstrates that FBXW2 inhibits tumor migration, invasion and metastasis in lung cancer cells by targeting β-catenin for degradation.

Date: 2019
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DOI: 10.1038/s41467-019-09289-5

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