Fig. 4. Protein expression and effect of G2/M arrest inhibitors on cell proliferation.
a Expression of proteins involved in G2/M cell cycle arrest (CDK1, p-Thr161-CDK1, p-Tyr15-CDK1, p-Thr14-CDK1) was assessed by western blotting in Ramos, DOHH2 and Rec-1 cells during and after exposure to 0 (NT) and 6 MBq/mL of 177Lu-lilotomab for 18 h. Cell proliferation (flow cytometry) and CDK1 phosphorylation at Tyr15 and Thr14 (western blotting) were determined in b Ramos and c DOHH2 cells during and after exposure to 0 (NT) and 6 MBq/mL 177Lu-lilotomab alone, or with 1 µM MK-1775 (WEE-1 inhibitor) or 1 µM PD-166285 (WEE-1 and MYT-1 inhibitor). Proliferation was calculated as the percentage of the value in nontreated cells (left black bar) set to 100%. Data are the mean ± SD of three independent experiments in triplicate (*p < 0.05).