Abstract
PURPOSE: Baicalein, a natural flavonoid derived from the root of Scutellaria baicalensis, has demonstrated antitumor efficacy in several cancers. However, its effects on human mesothelioma remain largely unclear. This study evaluates the antitumor roles and mechanisms of baicalein in mesothelioma cell lines. MATERIALS AND METHODS: Effects of baicalein on mesothelioma cells phenotypic changes were investigated by measuring cell proliferation, apoptosis, migration, invasion, and cell-cycle alterations. Bioinformatic methods were applied to predict the mechanisms by which baicalien mediated its antitumor roles in mesothelioma. Crucial signaling molecules among p53-FOXM1 signaling axis, including p53, FOXM1 and cyclin B1, were evaluated by immunoblotting in mesothelioma cells. RESULTS: Treatment with baicalein significantly inhibited mesothelioma cell viability in a dose-dependent manner, with 48 h IC(50) values of 48.9 µM for MESO257 and 53.2 µM for MESO924. Baicalein also markedly reduced cell migration and invasion, while inducing apoptosis in both cell lines. Mechanistically, baicalein suppressed the p53-FOXM1 signaling axis, decreasing FOXM1 and Cyclin B1 while increasing p53 expression. Furthermore, FOXM1 overexpression attenuated the antiproliferative, anti-migratory, anti-invasive and proapoptotic effects of baicalein. CONCLUSION: Baicalein suppresses mesothelioma cell growth and invasion in vitro through modulation of the p53-FOXM1 signaling axis. These findings support its potential as a lead compound for further preclinical evaluation in mesothelioma.