Up-regulation of LINC00346 inhibits proliferation of non-small cell lung cancer cells through mediating JAK-STAT3 signaling pathway.

OBJECTIVE: To investigate the expression levels of LINCRNA00346 in tissues and cells in patients with non-small cell lung cancer (NSCLC) and its biological function. PATIENTS AND METHODS: The relative expression levels of LINC 00346 in 70 cases of tissues and cells in NSCLC patients were detected via quantitative reverse transcription polymerase chain reaction (qRT-PCR). The specific interference sequences of LINC 00346 were designed and the transfection efficiency after 48 h was detected. The effect of LINC 00346 on the proliferation capacity of NSCLC cells was studied via cell counting kit-8 (CCK-8) assay. After the interference in LINC 00346 expression in NSCLC cells, the changes in cell cycle and apoptosis were detected via flow cytometry. The nude-mouse transplanted tumor model was established to study the effect of LINC 00346 on in vivo tumorigenic ability of tumor cells. After the interference in LINC 00346 expression, the changes in expressions of molecular markers in the downstream signaling pathway were detected via Western blotting. RESULTS: The LINC 00346 expressions were relatively high in 50 cases of tissues and 5 kinds of tumor cells in NSCLC patients. After the interference in LINC 00346 expression, the apoptosis of tumor cells was promoted, the cell proliferation was inhibited, and the cell cycle was arrested in G1-G0 phase. The animal experiment revealed that the interference in LINC 00346 expression could inhibit the in vivo tumorigenic ability of tumor cells. Western blotting showed that LINC 00346 could exert its function through partially regulating the Janus kinase/signal transducer and activator of transcription 3 (JAK-STAT3) signaling pathway. CONCLUSIONS: The expressions of LINC 00346 were relatively high in NSCLC tissues and cells. LINC 00346 promotes the proliferation and inhibits the apoptosis of NSCLC cells through regulating the JAK-STAT3 signaling pathway.