CircRNA circ-BANP-mediated miR-503/LARP1 signaling contributes to lung cancer progression.

Recently, circular RNAs (circRNAs) attract much attention due to their potential vital functions in multiple human diseases, including cancer. circ-BANP has been reported to modulate colorectal cancer growth. Nevertheless, the relationship between circ-BANP and lung cancer requires to be investigated. In this study, we found circ-BANP was overexpressed in lung cancer tissues. Higher circ-BANP expression was associated with lower survival rate. Moreover, silencing circ-BANP markedly inhibited proliferation, migration and invasion of lung cancer cells in vitro and impaired tumor propagation in vivo. In mechanism, circ-BANP was identified as the sponge of miR-503 while miR-503 targets LARP1. Circ-BANP-induced inhibition of miR-503 led to increased expression of LARP1 in lung cancer. Finally, rescue assays indicated that LARP1 restoration partially reversed the effects of circ-BANP knockdown in lung cancer. In sum, our study illustrated that circ-BANP-mediated miR-503/LARP1 signaling promoted lung cancer growth, migration and invasion, providing a novel insight on the mechanism underlying lung cancer progression.