CircRNA_0000429 Regulates Development of NSCLC by Acting as a Sponge of miR-1197 to Control MADD

BACKGROUND: Non-small-cell lung carcinoma (NSCLC) is the most common type of lung cancer. Circular RNA_0000429 (circ_0000429) is an identified circular RNA (circRNA) that is correlated with cancer progression. However, the role of circ_0000429 in NSCLC remains unknown. In the present study, we aimed to investigate the function of circ_0000429 in NSCLC and the underlying mechanism. METHODS: The expression patterns of circ_0000429 were determined using qRT-PCR in NSCLC samples and cell lines. The subcellular distribution of circ_0000429 in NSCLC cells was analyzed by fluorescence in situ hybridization (FISH). Cell proliferation was examined utilizing the CCK-8 assay. Cell migration and invasion were evaluated using the transwell assay. We used the bioinformatics software TargetScan and miRanda to predict circRNA–miRNA and miRNA–mRNA interactions. RESULTS: Our results showed that circ_0000429 expressions were significantly upregulated in NSCLC tissues and cell lines. Knockdown of circ_0000429 significantly inhibited the cell proliferation, migration, and invasion of NSCLC cells in vitro. Furthermore, we demonstrated that circ_0000429 acted as a sponge to absorb microRNA-1197 (miR-1197) and promoted MADD expression. CONCLUSION: Collectively, our results demonstrated that circ_0000429 exhibited a carcinogenic role by sponging miR-1197 and regulating CMADD expression in NSCLC. These findings provided evidence for understanding the role of circ_0000429 in NSCLC tumorigenesis.