Long non-coding TUG1 accelerates prostate cancer progression through regulating miR-128-3p/YES1 axis

S.-D. Hao, J.-X. Ma, Y. Liu, P.-J. Liu, Y. Qin

Department of Urology, Zhejiang Integrated Traditional and Western Medicine Hospital/Hangzhou Red Cross Hospital, Hangzhou, China. banyingyanyaflo@163.com

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• Oncology

OBJECTIVE: Dysregulation of long non-coding RNAs (lncRNAs) is being found to have relevance to human cancers, including prostate cancer (PCa). Taurine-upregulated gene 1 (TUG1) has been demonstrated to have a potential oncogenic role in PCa. Then the aim of this study was to investigate the molecular mechanisms of TUG1 on PCa progression.

PATIENTS AND METHODS: The expression levels of TUG1, YES proto-oncogene 1 (YES1) mRNA and miR-128-3p were assessed using quantitative real-time polymerase chain reaction. Cell proliferation ability, apoptosis, and migration and invasion capacities were detected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay, flow cytometry and transwell assay, respectively. Western blot analysis was employed to evaluate the indicated proteins levels. The interaction between miR-128-3p and TUG1 or YES1 was determined using the Dual-Luciferase reporter assay. In vivo assay was used to observe the effect of TUG1 on tumor growth in vivo.

RESULTS: Our data indicated that TUG1 was upregulated in PCa tissues and cells and predicted poor prognosis. TUG1 knockdown weakened PCa cell proliferation, migration, invasion, epithelial-mesenchymal transition (EMT), and accelerated cell apoptosis in vitro. Mechanistically, TUG1 directly interacted with miR-128-3p and miR-128-3p mediated the regulatory effects of TUG1 depletion on PCa cell progression. YES1 was a direct target of miR-128-3p and TUG1 modulated YES1 expression by sponging miR-128-3p. Moreover, TUG1 silencing repressed PCa cell progression in vitro through YES1. Additionally, TUG1 silencing mitigated tumor growth in vivo.

CONCLUSIONS: Our study suggested that TUG1 silencing retarded PCa cell progression in vitro and tumor growth in vivo through miR-128-3p/YES1 axis, showing that targeting TUG1 might be a novel therapeutic strategy for PCa management.

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