Fig 1: Co-treatment of SHR2554 and HBI8000 induces apoptosis, cell cycle arrest in the G1/S phase and change of histone modification. (a,b) Combination treatment induced G1 phase arrest in DLBCL cells. Cells were treated with indicated concentrations of SHR2554 and HBI8000 for 48 h. “–” indicated no inhibitor treatment. Then cell cycle was assessed by flow cytometry and cell-cycle-related proteins (CDK2, CDK4, CDK6, P21) were detected by Western blot. (c,d) Combination treatment prompted apoptosis in DLBCL cells. Cells were treated with indicated concentrations of SHR2554 and HBI8000 for 72 h. Then apoptosis determined by FITC+ PI− cells and FITC+ PI+ cells was assessed by flow cytometry and apoptosis-related proteins (Cleaved PARP, Caspase 3, XIAP, Mcl-1, Bcl-xL) were detected by Western blot. (e) Combination treatment increased acetylation of H3K27 in DLBCL cells. Cells were treated with indicated concentrations of SHR2554 and HBI8000 for 48 h. Then cells were collected and H3K27me3, H3K27ac were detected by Western blot. Representative figures are presented. Data are expressed as mean ± SD of three independent experiments and representative figures are presented. * p < 0.05, ** p < 0.01, *** p < 0.001, compared with vehicle group; # p < 0.05, ## p < 0.01, ### p < 0.001 compared with SHR2554 group. Detailed information about Western Blot can be found at supplementary materials.