Fig. 2
b-AP15-induced apoptosis was associated with activation of caspase and inhibition of anti-apoptotic protein expression in both GCB- and ABC-DLBCL cells. a b-AP15 induces cleavage of PARP and caspases-3, − 8, − 9 in SU-DHL-4, SU-DHL-2, OCI-LY-1, OCI-LY-19 cells. Cells were dose- and time-dependently treated with b-AP15, then PARP, and caspase-3, − 8, − 9 cleavage were analyzed by Western blots. GAPDH was used as a loading control. C, control. b b-AP-15 induces down regulation of mitochondrial membrane potential in SU-DHL-4, SU-DHL-2, OCI-LY-1, OCI-LY-19 cells. SU-DHL-4, SU-DHL-2, OCI-LY-1, OCI-LY-19 cells were treated with b-AP15 in different doses showed in data for 24 h, mitochondrial membrane potential were detected by inverted fluorescence microscope (the upper panel) or flow cytometry (the lower panel) after cationic hydrophobic mitochondrial potential dye staining. The fluorescence images exhibited the decrease of MMP which indicated with reduced red fluorescence. The results of flow cytometry assay were shown and the percentage of low MMP were labeled, and the statistics performed with graphs. Mean ± SD (n = 3). *P < 0.05, **P < 0.01, versus control group. c b-AP15 induces AIF and cytochrome C release. SU-DHL-4, SU-DHL-2 cells were exposed to b-AP15 for 3, 6, and 9 h, then cell cytoplasmic proteins were extracted and the released AIF and cytochrome C were detected by Western blot analysis. d b-AP15 decreases the expression of anti-apoptotic proteins in SU-DHL-4, SU-DHL-2 cells. Cells were dose- and time-dependently treated with b-AP15. The anti-apoptotic proteins Mcl-1, XIAP, Bax, Bcl-xl, Survivin were analyzed by Western blot analysis