Mdm2 expression is regulated by iron. (A) HEPG2 cells were mock-treated or treated with various amounts of DFO or FAC, followed by western blot analysis to examine the levels of IRP2, Mdm2 and actin proteins. (B-C) MCF7 (B) and HCT116 (C) cells were mock-treated or treated with DFO (0-300 μM, 24h) for 24 hours and the levels of IRP2, TFR, Mdm2, p53, and actin proteins were examined by western blot analysis. (D-E) HCT116-p53-KO (D) and Mia-PaCa2 (E) cells were mock-treated or treated with DFO (0-300 μM, 24h) for 24 hours and the levels of IRP2, TFR, Mdm2, and actin proteins were examined by western blot analysis.