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Long Non-Coding RNA TMPO-AS1 Promotes Cell Migration and Invasion by Sponging miR-140-5p and Inducing SOX4-Mediated EMT in Gastric Cancer

Authors Sun Y, Han C

Received 24 October 2019

Accepted for publication 21 January 2020

Published 20 February 2020 Volume 2020:12 Pages 1261—1268


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Professor Lu-Zhe Sun

Yonghong Sun, Chunyao Han

Department of General Surgery, Second Hospital of Shanxi Medical University, Taiyuan City, Shanxi Province 030001, People’s Republic of China

Correspondence: Yonghong Sun
Department of General Surgery, Second Hospital of Shanxi Medical University, No. 382 Wuyi Road, Taiyuan City 030001, Shanxi Province, People’s Republic of China

Background: Mounting evidence show that long non-coding RNAs (lncRNAs) play critical roles in the progression of various human cancers, including gastric cancer (GC), a common gastrointestinal tumor. In this study, the biological functions of lncRNA TMPO-AS1 in GC were studied.
Methods: TMPO-AS1 and miR-140-5p expression levels were detected in GC tissues and cell lines by RT-qPCR analysis. Knockdown or overexpression of TMPO-AS1 was conducted to evaluate the effects of TMPO-AS1 on the malignant behaviors of GC cells. Bioinformatic prediction and dual-luciferase reporter assay were performed to investigate the direct interaction between TMPO-AS1 and miR-140-5p in GC.
Results: We observed that TMPO-AS1 was up-regulated in GC tissues, and high TMPO-AS1 expression in GC patients was closely correlated with aggressive clinicopathologic characteristics and poor overall survival. Functionally, gain- and loss-of-function studies showed that TMPO-AS1 overexpression enhanced the proliferation, migration, invasion and EMT of GC cells in vitro, whereas knockdown of TMPO-AS1 inhibited these malignant traits. Importantly, we demonstrated that TMPO-AS1 could function as a competing endogenous RNA (ceRNA) by sponging miR-140-5p in GC cells, thereby diminishing the inhibition on SOX4, an EMT regulator.
Conclusion: Our findings indicated that TMPO-AS1 promotes GC progression partly by regulating miR-140-5p/SOX4 axis, and may serve as a novel therapeutic target for GC.

Keywords: gastric cancer, long non-coding RNA TMPO-AS1, miR-140-5p, SOX4, EMT

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