miR-210 promotes lung adenocarcinoma proliferation, migration, and invasion by targeting <bold>lysyl oxidase-like 4</bold>

Accumulating evidence has revealed that various microRNAs are deregulated and involved in lung cancer development and metastasis. miR-210 is implicated in several cancer progression. However, the detailed biological function and role of miR-210 in lung adenocarcinoma remains unclear. Our current study was aimed to investigate the mechanism of miR-210 in lung adenocarcinoma progression. We observed that miR-210 was significantly upregulated in lung cancer cell lines (A549 and H1650) in comparison to BEAS-2B cells. In addition, we found that miR-210 was greatly elevated in lung adenocarcinoma tissues. Then, it was shown that overexpression of miR-210 was able to promote lung cancer cell proliferation and colony formation ability while inhibitors of miR-210 exhibited a reversed phenomenon. Subsequently, A549 and H1650 cell migration and invasion capacity were obviously restrained by miR-210 inhibition whereas induced by miR-210 mimics. Lysyl oxidase-like 4 (LOXL4), a member of the secreted copper-dependent amine oxidases has been found to be increased or decreased in different cancer types. Here, we confirmed that LOXL4 could serve as a downstream target of miR-210 and miR-210 promoted lung cancer progression via targeting LOXL4. In A549 and H1650 cells, knockdown of LOXL4 dramatically repressed lung cancer cell proliferation, migration, and invasion. In conclusion, our study implied that miR-210 might indicate a new perspective for lung cancer.