Figure 3.
Activation of the ATM-CHK2 and ATR-CHK1 pathways in cells exposed to various combinations of busulfan-melphalan-gemcitabine-SAHA (B±M±G±S). J45.01 cells were continuously exposed to drugs for 48 hr and total protein extracts were analyzed for phosphorylation of ATM and ATR and their known substrates. B: 20 μM busulfan; M: 0.7 μM melphalan; G: 0.01 μM gemcitabine; S: 0.6 μM suberoylanilide hydroxamic acid.