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MiR-26a-5p Serves as an Oncogenic MicroRNA in Non-Small Cell Lung Cancer by Targeting FAF1

Authors Ye M, Lin D, Li W, Xu H, Zhang J

Received 4 May 2020

Accepted for publication 14 July 2020

Published 11 August 2020 Volume 2020:12 Pages 7131—7142


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Chien-Feng Li

Ming-fan Ye,1,* Dong Lin,2,* Wu-jin Li,1 Hai-peng Xu,2 Jing Zhang2

1Department of Chest Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, People’s Republic of China; 2Department of Thoracic Oncology, Fujian Provincial Cancer Hospital, Fuzhou, Fujian Province, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Jing Zhang Tel +86 13809557405

Purpose: Non-small cell lung cancer (NSCLC) accounts for approximately 80– 85% of all lung cancers, with the FAS-associated factor 1 (FAF1) acting as a tumor suppressor. MicroRNAs (miRNAs) can influence cancer progression by targeting oncogenes or anti-oncogenes. In this study, we aimed to reveal the influence of miR-26a-5p on the regulation of FAF1 expression and NSCLC progression, with the motivation of identifying a potential therapeutic target for NSCLC treatment.
Methods: A dual-luciferase reporter assay was used to check for the direct targeting of FAF1 by miR-26a-3p. The miR-26a-5p inhibitor or FAF1 shRNA plasmid was transfected into A549 and H1299 cells to modulate FAF1 expression. Then, the effect of miR-26a-5p/FAF1 on cellular functions was investigated. MTT assay was used to evaluate cell viability. EdU proliferation assay and cell cycle assay were performed to analyze the effect of miR-26a-5p on cell replication and cell cycle. We used annexin V-FITC and PI to stain apoptotic cells, followed by flow cytometric analysis. Transwell and wound healing assays were performed to investigate metastasis. Moreover, the effect of miR-26a-5p/FAF1 on cancer progression was examined in vivo. Lastly, the underlying mechanism was uncovered using RT-qPCR, Western blotting, and TOP/FOP flash assay.
Results: miR-26a-5p was found to directly target FAF1 and downregulate its expression. Blocking miR-26a-5p inhibited the cell growth, migration, and invasion, but promoted cell apoptosis. In addition, this inhibited the growth of tumor in mice. FAF1 knockdown reversed the functions of miR-26a-5p. Further, miR-26a-5p/FAF1 was observed to play an important role in the Wnt signaling pathway, regulating the expression of genes such as AXIN, c-Myc, and cyclin-D1.
Conclusion: Taken together, we show that miR-26a-5p functions as an oncogenic microRNA in NSCLC by targeting FAF1 and may serve as a potential target for NSCLC treatment.

Keywords: miR-26a-5p, FAF1, NSCLC, proliferation, apoptosis, metastasis

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