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Objective   In the present investigation, we evaluated the effects of microRNA-365 (miR-365) on non-small-cell lung cancer (NSCLC) cell metastasis and invasion in patients with bone metastasis of lung cancer.Methods   Blood samples from patients with NSCLC and healthy controls and the A549 adenocarcinoma cell line were included in this study. Quantitative real-time PCR and microarray were performed on blood samples. The MTT assay, luciferase reporter assay, Transwell assay, ELISA, and western blot were performed to evaluate expression of associated factors.Results   Expression of miR-365 was reduced in patients with bone metastasis of NSCLC. Downregulation of miR-365 promoted cell growth, metastasis, and invasion of NSCLC. Upregulation of miR-365 reduced cell growth, metastasis, and invasion of NSCLC. Downregulation of miR-365 induced expression of NKX homeobox-1 (NKX2-1), epidermal growth factor receptor (EGFR), phosphoinositide-3-kinase (PI3K), and p-Akt proteins in an in vitro model of NSCLC. Inhibition of NKX2-1 reduced the effects of miR-365 on cell growth, metastasis, and invasion of NSCLC. Activation of EGFR reduced the effects of miR-365 on cell growth, metastasis, and invasion of NSCLC.Conclusions   The study established that the serum miR-365 suppresses NSCLC cell metastasis and invasion in patients with bone metastasis of lung cancer via EGFR/PI3K through NKX2-1.

Serum microRNA-365 suppresses non-small-cell lung cancer metastasis and invasion in patients with bone metastasis of lung cancer