The role and mechanism of microRNA‑18a‑5p in oral squamous cell carcinoma

Huang,Chenyao; Song,Hongning; Lai,Linfeng

doi:10.3892/mmr.2019.10403

The role and mechanism of microRNA‑18a‑5p in oral squamous cell carcinoma

Authors:
- Chenyao Huang
- Hongning Song
- Linfeng Lai
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Affiliations: Department of Oral and Maxillofacial Surgery, Wenzhou Central Hospital, Wenzhou, Zhejiang 325000, P.R. China, Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Taishan Medical University, Tai'an, Shandong 271000, P.R. China
Published online on: June 20, 2019 https://doi.org/10.3892/mmr.2019.10403
Pages: 1637-1644
Copyright: © Huang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The purpose of this study was mainly to explore the role and mechanism of microRNA‑18a‑5p (miR‑18a‑5p) in oral squamous cell carcinoma (OSCC). The expression of miR‑18a‑5p in OSCC cells and normal cells was firstly detected using reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR). The cell viability, apoptosis, migration and invasion abilities of OSCC cells were determined by MTT, cell apoptosis, wound healing and Transwell assays respectively. Additionally, bioinformatics software analysis and luciferase reporter assays were performed to predict and confirm the candidate target of miR‑18a‑5p. Western blot analysis was used to assess protein expression. It was revealed that the expression of miR‑18a‑5p in OSCC cells was higher than that in normal cells. In vitro studies revealed that the cell viability, migration and invasion abilities of OSCC cells were promoted and cell apoptosis was inhibited by miR‑18a‑5p overexpression. In addition, Smad2 was identified as a target of miR‑18a‑5p. It was also revealed that miR‑18a‑5p overexpression significantly inhibited the expression of Smad2, Smad4 and E‑cadherin, and the levels of Smad7, collagen I, transforming growth factor‑β (TGF‑β), α‑smooth muscle actin (α‑SMA), vimentin were enhanced. While miR‑18a‑5p downregulation presented the opposite effects. In conclusion, the results indicated that miR‑18a‑5p can regulate the biological process of OSCC by targeting Smad2 and miR‑18a‑5p/Smad2 may be potential therapeutic targets for OSCC.

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