| Summary: | Rui Liu,1,2 Yajuan Chen,1 Tao Shou,2 Jing Hu,2 Chen Qing1 1Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming 650031, People’s Republic of China; 2Department of Oncology, The First People’s Hospital of Yunnan Province, Kunming 650032, Yunnan, People’s Republic of China Background: miRNAs were found to play crucial roles in regulating cellular behaviors. The aim of this study was to investigate the biological function of miRNA-99b-5p (miR-99b-5p) in non-small cell lung cancer (NSCLC). Materials and methods: miR-99b-5p expression level in NSCLC cell lines was detected by quantitative real-time PCR (qRT-PCR). Cell proliferation, migration and invasion were examined by cell counting kit-8 (CCK-8) assay, wound-healing assay and Transwell invasion assay, respectively. Dual-luciferase activity reporter assay and Western blot assay were conducted to validate the target of miR-99b-5p. Results: The expression of miR-99b-5p was decreased in NSCLC cell lines compared with normal cell line. Overexpression of miR-99b-5p inhibits cell proliferation, migration and invasion in vitro. FZD8 was validated as a direct target of miR-99b-5p. Overexpression of FZD8 partially abolished the effects of miR-99b-5p mimic on NSCLC cell behaviors. Conclusion: Collectively, our results demonstrated that miR-99b-5p inhibits NSCLC cell proliferation, migration and invasion through targeting FZD8. This newly identified miR-99b-5p/FZD8 axis provided novel insights into the mechanisms underlying NSCLC progression. Keywords: miR-99b-5p, FZD8, non-small cell lung cancer, migration, invasion
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