Objective To investigate the molecular basis for apoptosis of glioma by tubeimoside-1( TBMS Ⅰ) in U251 cell line. Methods U251 cells were exposed to different concentrations of tubeimoside-1,cell proliferative activity was evaluated using MTT assay. The changes of nuclei morphology of U251 cells after tubeimoside-1 treatment were observed using Hoechst 33258 staining. Apoptotic rate induced by tubeimoside-1 treatment was measured by flow cytometry using Annexin V-FITC / PI staining. The expression levels of...