Ryuvidine and Mitoxantrone reduce CDC7 levels and pSer40/41 MCM2 phosphorylation.

<p>A) Molecular structure of PHA-767491, Ryuvidine and Mitoxantrone. B) HeLa cells were incubated with either CDC7 inhibitor PHA-767491, Ryuvidine or Mitoxantrone at 10 micromolar each for the indicated time. Protein extracts were prepared and analyzed by western blot with the indicated antibodies. C) Levels of Cdc7-independent pSer41MCM2 and Cdc7-dependent pSer40/41MCM2 phosphorylation assessed in HeLa cells treated with the indicated concentration of PHA-767491, Ryuvidine or Mitoxantrone. D) Cells were incubated with either PHA-767491, Ryuvidine or Mitoxantrone at the indicated concentration for nine hours. Protein extracts were then prepared and analyzed by western blot with the indicated antibodies. E) HeLa cells incubated with either PHA-767491, Ryuvidine or Mitoxantrone at 10 micromolar each for nine hours in the presence or absence of 20 micromolar of caspase inhibitor Boc-D-fmk. Levels of Ser40/41MCM2 phosphorylation, CDC7 and MCM2 abundance as well as PARP cleavage, were assessed by western blotting.