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Molecular Cancer
Published in: Molecular Cancer 1/2016

Open Access 01-12-2016 | Research

MicroRNA-505 functions as a tumor suppressor in endometrial cancer by targeting TGF-α

Authors: Shuo Chen, Kai-Xuan Sun, Bo-Liang Liu, Zhi-Hong Zong, Yang Zhao

Published in: Molecular Cancer | Issue 1/2016

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Abstract

Background

Endometrial carcinoma (EC) is one of the most lethal gynecologic cancers. Patients frequently have regional or distant metastasis at diagnosis. MicroRNAs are small non-coding RNAs that participate in numerous biological processes. Recent studies have demonstrated that miR-505 is associated with several types of cancer; however, the expression and function of miR-505 have not been investigated in EC.

Methods

miR-505 expression in normal endometrial tissue, endometrial carcinomas were quantified by Quantitative reverse transcription PCR. The endometrial carcinoma cell lines HEC-1B and Ishikawa were each transfected with miR-505 or scrambled mimics, after which cell phenotype and expression of relevant molecules were assayed. Dual-luciferase reporter assay and a xenograft mouse model were used to examine miR-505 and its target gene TGF-α.

Results

RT-PCR results demonstrated that miR-505 was significantly downregulated in human EC tissues compared to normal endometrial tissues. Besides, miR-505 expression was negatively associated with FIGO stage (stage I-II vs. III-IV), and lymph node metastasis (negative vs. positive). In vitro, overexpression of miR-505 significantly suppressed EC cell proliferation, increased apoptosis and reduced migratory and invasive activity. A miR-505 binding site was identified in the 3′ untranslated region of TGF-α mRNA (TGFA) using miRNA target-detecting software; a dual luciferase reporter assay confirmed that miR-505 directly targets and regulates TGFA. RT-PCR and Western-blotting results indicated that overexpressing miR-505 reduced the expression of TGF-α and the TGF-α-regulated proteins MMP2, MMP9, CDK2, while induced Bax and cleaved-PARP expression in EC cells. In vivo, overexpression of miR-505 reduced the tumorigenicity and inhibited the growth of xenograft tumors in a mouse model of EC.

Conclusions

Taken together, this study demonstrates that miR-505 acts as tumor suppressor in EC by regulating TGF-α.
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Metadata
Title
MicroRNA-505 functions as a tumor suppressor in endometrial cancer by targeting TGF-α
Authors
Shuo Chen
Kai-Xuan Sun
Bo-Liang Liu
Zhi-Hong Zong
Yang Zhao
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2016
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/s12943-016-0496-4

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