Ovol2 induces mesenchymal–epithelial transition via targeting ZEB1 in osteosarcoma
Received 15 November 2017
Accepted for publication 7 March 2018
Published 22 May 2018 Volume 2018:11 Pages 2963—2973
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Cristina Weinberg
Peer reviewer comments 2
Editor who approved publication: Dr Yao Dai
Jijun Liu,1 Qi Wu,1 Yonggui Wang,1 Yulong Wei,2 Hong Wu,3 Lijun Duan,1 Qiang Zhang,1 Yonggang Wu1
1Department of Orthopedics, 2Department of Pathology, 3Department of Ultrasound, Bayannaoer City Hospital, Bayannaoer, Inner Mongolia, People’s Republic of China
Purpose: Osteosarcoma (OS) is the most common type of primary solid bone tumor. Ovo-like zinc finger 2 (Ovol2), a zinc finger transcription factor, is a mesenchymal–epithelial transition (MET) driver that induces miR-200 expression in prostate cancer, breast cancer, and hepatocellular carcinoma. However, little is known about the expression and function of MET in sarcomas, including OS. This study investigated the expression and clinicopathological significance of Ovol2 and its effect on MET in OS.
Patients and methods: The Ovol2 expression in the tumor samples from patients with OS was examined using immunohistochemistry (IHC). We then upregulated the Ovol2 expression in MG-63 and SW1353 cells, detected the expression of MET-associated proteins, and observed the effects of Ovol2 on OS cell proliferation, migration, and cytoskeleton reorganization using Cell Counting Kit-8, transwell invasion, and phalloidin dyeing assays, respectively. The correlation between zinc finger E-box-binding homeobox 1 (ZEB1) and Ovol2 was assessed using the luciferase gene reporter assay in the MG-63 and SW1353 cells and IHC in the human OS tissue samples.
Results: The Ovol2 protein overexpression was related to the clinical grade (P=0.02) and the recurrence and metastasis (P=0.02) of OS. Results of the in vitro experiments showed that Ovol2 overexpression can suppress cell migration and invasion and can regulate the expression levels of MET-associated proteins. Ovol2 suppresses ZEB1 expression by binding to the ZEB1 promoter. Ovol2 is concomitant with a reduced IHC expression of ZEB1 in human OS tissues.
Conclusion: Ovol2 expression is associated with MET in OS cells and suppresses ZEB1 expression and OS progression.
Keywords: Ovol2, mesenchymal–epithelial transition, osteosarcoma, ZEB1
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