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Vasodilator-stimulated phosphoprotein (VASP), a novel target of miR-4455, promotes gastric cancer cell proliferation, migration, and invasion, through activating the PI3K/AKT signaling pathway

Authors
  • Chen, Haiqun1
  • Dai, Gang1
  • Cai, Yiting1
  • Gong, Qinhao1
  • Wu, Wei1
  • Gao, Min1
  • Fei, Zhewei2
  • 1 The Affiliated Hospital of Shanghai Jiao Tong University, Department of General Surgery, The ChongMing Branch of XinHua Hospital, Shanghai, 200240, China , Shanghai (China)
  • 2 XinHua Hospital, The Affiliated Hospital of Shanghai Jiao Tong University, Department of General Surgery, No. 1665, Kong Jiang Road, Shanghai, 200240, China , Shanghai (China)
Type
Published Article
Journal
Cancer Cell International
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Jul 09, 2018
Volume
18
Issue
1
Identifiers
DOI: 10.1186/s12935-018-0573-4
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundMicroRNAs (miRNAs) are small non-coding RNAs which play important roles in the carcinogenesis of gastric cancer (GC). Expression profiling of miRNAs in paired gastric cancer and adjacent normal gastric tissues has demonstrated that miR-4455 is down-regulated in gastric cancer tissues, but its functional role in the carcinogenesis of GC had not previously been investigated.AimsThe purpose of this study was to investigate the functional and biological mechanisms of miR-4455 in the progression of GC, in vitro.MethodsExpression of miR-4455 was compared in human GC tissue samples and paired adjacent normal tissue samples. The in vitro effects of miR-4455 expression in MGC-803 cells on their proliferation, invasion, and migration were assessed by MTT assays and 5-bromo-2′-deoxyuridine staining, matrigel-invasion analysis and wound healing assays. Bioinformatics analysis (using PicTar, target scan and miRBase target) was used to identify potential targets for miR-4455, and the luciferase reporter assay, qRT-PCR and Western-blotting analyses were used to confirm VASP as the target of miR-4455. In addition, the effects of downregulation of VASP on the activation of PI3K/AKT signaling pathway were measured using Western-blot analysis.ResultsThe expression of miR-4455 was markedly down-regulated in gastric cancer tissues vs. adjacent normal tissues, and miR-4455 expression inhibited the proliferation, invasion and migration of MGC-803 GC cells in vitro. Luciferase reporter assays revealed that miR-4455 inhibited VASP expression by targeting the 3′-UTR sequence of VASP. Furthermore, silencing of VASP markedly inhibited the activation of the PI3K/AKT signaling pathway.ConclusionOur results suggest that miR-4455 functions as a tumor suppressor in gastric cancer, by targeting VASP leading to activation of the PI3K/AKT signaling pathway and the inhibition of VASP mediated proliferation, migration and invasion of gastric cancer cells.

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