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miR-622 suppresses tumor formation by directly targeting VEGFA in papillary thyroid carcinoma

Authors Wang R, Ma Q, Ji L, Yao Y, Ma M, Wen Q

Received 12 November 2017

Accepted for publication 12 January 2018

Published 16 March 2018 Volume 2018:11 Pages 1501—1509

DOI https://doi.org/10.2147/OTT.S156810

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Lucy Goodman

Peer reviewer comments 3

Editor who approved publication: Dr Yao Dai


Renjie Wang, Qingjie Ma,* Linlin Ji, Yue Yao, Mengshi Ma, Qiang Wen*

Department of Nuclear Medicine, China–Japan Union Hospital of Jilin University, Changchun, People’s Republic of China

*These authors contributed equally to this work

Background: MicroRNAs (miRNAs) were reportedly to play crucial roles in papillary thyroid carcinoma (PTC) tumorigenesis and development. Therefore, the discovery of miRNAs may provide a new and powerful tool for diagnosis and treatment of PTC.
Purpose:
The aim of this study was to investigate the biological function and underlying mechanism of miR-622 in PTC.
Materials and methods: The expression levels of miR-622 in PTC patient tissues and cell lines were determined by quantitative RT-PCR (qRT-PCR). The biological function including cell proliferation, colony formation, migration and invasion, as well as underling mechanism of miR-622 in PTC, were also evaluated by a series of in vitro and in vivo experiments.
Results: miR-622 expression level was significantly downregulated in PTC tissues and cell lines. Decreased miR-622 expression was associated with advanced clinical stage and lymph node metastasis (P<0.01). The overexpression of miR-622 in TPC-1 cells inhibited cell proliferation, migration and invasion in vitro, as well as suppress tumor growth in vivo. Moreover, we also demonstrated that miR-622 specifically targeted the 3'-UTR regions of vascular endothelial growth factor A (VEGFA) and inhibited its expression both mRNA level and protein levels. Overexpression of VEGFA reversed miR-622-mediated inhibition effect on cell proliferation, migration and invasion in thyroid cancer cells. More importantly, VEGFA expression was significantly increased and inversely correlated with the levels of miR-622 in PTC tissues.
Conclusion: These results show that miR-622 acts as a tumor suppressor in thyroid cancer, at least in part, via targeting VEGFA, and suggest that miR-622 may serves as a potential target for treatment of thyroid cancer patients.

Keywords: thyroid cancer, miR-622, VEGFA, proliferation, invasion

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