FAT4 silencing promotes epithelial-to-mesenchymal transition and invasion via regulation of YAP and [beta]-catenin activity in ovarian cancer

Background The adhesion molecule, FAT4, has a tumor suppressor function with a critical role in the epithelial-to-mesenchymal-transition (EMT) and anti-malignant growth in several cancers. No study has investigated yet its role in epithelial ovarian cancer (EOC) progression. In the present study, we...

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Bibliographic Details
Published in:BMC cancer 2020-05, Vol.20 (1)
Main Authors: Malgundkar, Shika Hanif, Burney, Ikram, Al Moundhri, Mansour, Al Kalbani, Moza, Lakhtakia, Ritu, Okamoto, Aikou, Tamimi, Yahya
Format: Article
Language:English
Subjects:
Analysis
Apoptosis
Cancer metastasis
Development and progression
Gene expression
Genes
Ovarian cancer
Proteins
Stem cells
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Summary:Background The adhesion molecule, FAT4, has a tumor suppressor function with a critical role in the epithelial-to-mesenchymal-transition (EMT) and anti-malignant growth in several cancers. No study has investigated yet its role in epithelial ovarian cancer (EOC) progression. In the present study, we examined the role of FAT4 in proliferation and metastasis, and its mechanisms of interaction in these processes. Methods We have performed cell viability, colony formation, and invasion assays in ovarian cancer cells treated with siRNA to knockdown FAT4 gene expression. The regulatory effects of FAT4 on proteins involved in apoptotic, Wnt, Hippo, and retinoblastoma signaling pathways were evaluated by Western blotting following FAT4 repression. Also, 426 ovarian tumor samples and 88 non-tumor samples from the Gene Expression Profiling Interactive Analysis (GEPIA) database were analyzed for the expression of FAT4. Pearson's correlation was performed to determine the correlation between FAT4 and the E2F5, cyclin D1, cdk4, and caspase 9 expressions. Results Lower expression of FAT4 was observed in ovarian cancer cell lines and human samples as compared to non-malignant tissues. This down-regulation seems to enhance cell viability, invasion, and colony formation. Silencing FAT4 resulted in the upregulation of E2F5, vimentin, YAP, [beta]-catenin, cyclin D1, cdk4, and Bcl2, and in the downregulation of GSK-3-[beta], and caspase 9 when compared to control. Furthermore, regulatory effects of FAT4 on the EMT and aggressive phenotype seem to occur through Hippo, Wnt, and cell cycle pathways. Conclusion FAT4 downregulation promotes increased growth and invasion through the activation of Hippo and Wnt-[beta]-catenin pathways. Keywords: FAT4, Silencing, Invasion, YAP, Ovarian cancer
ISSN:1471-2407
1471-2407
DOI:10.1186/s12885-020-06900-7