In the PPM1D-amplified MCF7 breast carcinoma cells, GSK2830371 increases the phosphorylation of multiple Wip1 substrates, including p53 (S15), Chk2 (T68), H2AX (S139) and ATM (S1981). GSK2830371 shows selective antiproliferative activity in a subset of lymphoid cell lines, all of which carry a wild-type TP53 allele. Furthermore, co-treatment of doxorubicin and GSK2830371 results in a synergistic antiproliferative effect in DOHH2 and MX-1 tumor cells.
In vivo
In vivo, GSK2830371 increases phosphorylation of Chk2 (T68) and p53 (S15) and decreases Wip1 protein concentrations in DOHH2 tumors. GSK2830371 (150 mg/kg p.o.) also inhibits the growth of DOHH2 tumor xenografts via inhibition of Wip1.