MiR-191-5p inhibits lung adenocarcinoma by repressing SATB1 to inhibit Wnt pathway.

Background To investigate the function of miR-191-5p in lung adenocarcinoma and its possible mechanism. Methods QRT-PCR was adopted for the detection of the expression levels of miR-191-5p and SATB1 (HGNC: 10541). The effects of miR-191-5p and SATB1 on cell proliferation and migration were examined through the CCK-8 and Transwell assays. Subsequently, the binding relationships between miR-191-5p and SATB1 were confirmed by dual-luciferase reporter gene assay. Finally, the potential mechanisms of action of miR-191-5p were explored through a serious of in vivo and in vitro experiments. Results Lung adenocarcinoma patients had a notably lower expression level of miR-191-5p than controls, patients with metastasis had a lower level than those without metastasis, and the level in patients with lung adenocarcinoma in stage III-IV was lower than that in patients with lung adenocarcinoma in stage I-II. Overexpression of miR-191-5p repressed the migration and proliferation of lung cancer A549/H1650 cells. According to the reporter gene assay, miR-191-5p could bind to SATB1. Besides, SATB1 was significantly overexpressed in cancer tissues of patients with lung adenocarcinoma, and SATB1 overexpression accelerated the migration and proliferation of A549/H1650 cells and reversed inhibition on cell migration and proliferation by miR-191-5p. Conclusion Overexpression of miR-191-5p is capable of blocking the migration and proliferation of lung cancer cells, and its mechanism may be through targeting SATB1 thus downregulating Wnt signaling.