Overexpression of miR‐4286 is an unfavorable prognostic marker in individuals with non–small cell lung cancer

: Non-small cell lung cancer (NSCLC) is still an unresolved source of tumor-related death internationally. Current studies have discovered that microRNAs (miRNAs) are associated with diverse cancers development, including NSCLC. Our paper focused on the functional character of miR-4286 in NSCLC. miR-4286 level in 68 cases of NSCLC tissues, matched neighboring nontumor tissues and different cancer cell lines were inspected by quantitative reverse transcription polymerase chain reaction (qRT-PCR). The connection concerning miR-4286 expression and clinicopathological features of patients with NSCLC were further determined. After knockdown or overexpression of miR-4286, cell viability, cell cycle, and/or apoptotic cells were examined by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and flow cytometry assay, respectively. Moreover, the cell cycle- and apoptosis-related proteins were estimated by qRT-PCR and Western blot. In comparison with the matched nontumor tissues, miR-4286 was significantly enhanced in lung malignancy tissues and different cell lines. miR-4286 expression was related with the tumor-node-metastasis stage, lymphatic metastasis, and distant metastasis. Cell viability was ominously weakened by suppression of miR-4286 in A549 cells, whereas was statistically upregulated by overexpression of miR-4286 in NCI-H1299 cells. Additionally, we detected that suppression of miR-4286 tempted cell cycle arrest in G1 stage and fortified apoptosis in A549 cells. Runx3 was recognized as one target gene of miR-4286, and the impacts of suppression of miR-4286 on cell viability and apoptosis were through regulation of Runt-related transcription factor 3. Our study suggests that miR-4286 overexpression represents a tumor promoter role in NSCLC cells.