Long Non-coding RNA TUG1-mediated Down-regulation of KLF4 Contributes to Metastasis and the Epithelial-to-mesenchymal Transition of Colorectal Cancer by MiR-153-1

Overview

Journal Cancer Manag Res

Publisher Dove Medical Press

Specialty Oncology

Date 2019 Oct 3

PMID 31576172

Citations 22

Authors

Hongjin Shao

Dianbo Dong

Feng Shao

Affiliations

Soon will be listed here.

Abstract

Introduction: Taurine up-regulated 1 (TUG1) was reported to be over-expressed and involved in various human malignancies. However, its expression status and mechanistic importance in colorectal cancer (CRC) were yet to be defined.

Methods: Relative expressions of TUG1, miR-153-1 and Kruppel-like factor 4 (KLF4) were analyzed by real-time PCR. The potential influences of TUG1-proficiency and miR-153-1-deficiency on cell proliferation, migration and viability were determined by colony formation, wound healing and CCK-8 assays, respectively. Cell invasion was evaluated by transwell chamber assay. The regulatory effect of KLF4 on miR-153-1 was interrogated by luciferase reporter assay. Direct association between KLF4 and miR-153-1 promoter was measured by chromatin immunoprecipitation (ChIP) assay. Subcellular localization of TUG1 was determined by fractionization PCR. Enrichment of EZH2 on KLF4 promoter was analyzed by ChIP-PCR. The pro-tumoral activity of TUG1 was determined using xenograft tumor model.

Results: We demonstrated the over-expression of TUG1 and down-regulation of miR-153-1 in CRC. Knockdown of TUG1 or ectopic over-expression of miR-153-1 in SW480 significantly suppressed cell proliferation, migration and viability. TUG1 negatively modulated miR-153-1 expression, and simultaneous expression of TUG1 completely abolished the anti-tumor effect of miR-153-1. We further identified KLF4 as a transcription factor of miR-153-1, which was negatively regulated by TUG1 along with EZH2.

Conclusion: Our study unravels the critical involvement of TUG1/KLF4/miR-153-1 axis in CRC.

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