FAT4 functions as a tumour suppressor in gastric cancer by modulating Wnt/β-catenin signalling

2015/12/01 by Jian Cai, Dan Feng, Liang Hu +6 · 25 citations
Biochemistry, Genetics and Molecular Biology · Medicine · #Hippo pathway signaling and YAP/TAZ #Wnt/β-catenin signaling in development and cancer #Cancer Cells and Metastasis

paper · pdf · doi:10.1038/bjc.2015.367

Abstract

BACKGROUND: FAT4, a cadherin-related protein, was shown to function as a tumour suppressor; however, its role in human gastric cancer remains largely unknown. Here, we investigated the role of FAT4 in gastric cancer and examined the underlying molecular mechanisms. METHODS: The expression of FAT4 was evaluated by immunohistochemistry, western blotting, and qRT-PCR in relation to the clinicopathological characteristics of gastric cancer patients. The effects of FAT4 silencing on cell proliferation, migration, and invasion were assessed by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium) assay, and migration and invasion assays in gastric cancer cell lines in vitro and in a mouse xenograft model in vivo. RESULTS: Downregulation of FAT4 expression in gastric cancer tissues compared with adjacent normal tissues was correlated with lymph-node metastasis and poor survival. Knockdown of FAT4 promoted the growth and invasion of gastric cancer cells via the activation of Wnt/β-catenin signalling, and induced epithelial-to-mesenchymal transition (EMT) in gastric cancer cells, as demonstrated by the upregulation and downregulation of mesenchymal and epithelial markers. Silencing of FAT4 promoted tumour growth and metastasis in a gastric cancer xenograft model in vivo. CONCLUSIONS: FAT4 has a tumour suppressor role mediated by the modulation of Wnt/β-catenin signalling, providing potential novel targets for the treatment of gastric cancer.

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