Abstract
Non-small cell lung cancer (NSCLC) is the leading cause of cancer-related mortality worldwide. Increasing evidence suggests that long noncoding RNAs play crucial roles in lung cancer pathogenesis. We previously identified a novel lncRNA, LINC070974, which is associated with tumor cell proliferation. In the present study, we find that knockdown of LINC070974 inhibits cell proliferation, migration and invasion as well as tumor formation both in vitro and in nude mice. LINC070974 silencing also improves cisplatin efficacy in A549/DDP cells. The function of LINC070974 may depend on its interaction with YBX1. Knockdown of LINC070974 reduces the recruitment of YBX1 to the CCND1 promoter and delays tumor progression through its coregulatory genes, which are mainly involved in the p53 signaling pathway. We utilize nebulized inhalation to deliver siRNAs targeting LINC070974 and find that knockdown of LINC070974 significantly prevents tumor metastasis and growth in lung tissues. These findings reveal the role of LINC070974 in lung cancer and suggest a promising therapeutic approach involving siRNA inhalation.