Figure 5

AKT activation at 0, 14 and 31 days after long-term FR. (a) AKT phosphorylation on Ser473 (P-AKTSer473, active AKT) by FR exposure in AT5BIVA and AT5BIVA/ATM-wt cells (upper panel) and in GM7166 and GM7166/NBS1-wt cells (lower panel). (b) PP2A activity of un-irradiated control and 31 days of FR (0.05 Gy/fraction) in AT5BIVA and AT5BIVA/ATM-wt cells. Cell lysates were collected at 24 h after the last FR. Asterisks indicate a significant decrease in PP2A activity compared with un-irradiated control cells.