Effects of ionizing radiation on the AKT survival pathway or MAPK pathway in Aβ42-expressing flies. (A) The levels of phosphorylated (p)-AKT, p-GSK-3β and p-p70S6K in the heads of Aβ42-expressing flies (elav>Aβ42) after exposure to γ-irradiation (0.05 Gy or 4 Gy), compared to elav-GAL4 control flies, determined by western blot. AKT, GSK-3β and actin were used as controls, respectively. (B) Graph shows the relative p-AKT levels in the heads of each group compared to elav-GAL4 control flies (n=4). (C) The levels of p-p38, p-JNK and p-ERK in the heads of indicated groups by western blot. Actin, JNK and ERK were used as controls, respectively. (D) Graph shows the relative levels of p-p38 in the heads of each group compared to elav-GAL4 control flies (n=5). Data are expressed as mean±s.e.m. *P<0.05, **P<0.01, ***P<0.001. -, untreated control.