PD0166285 is a potent Wee1 and Chk1 inhibitor with activity at nanomolar concentrations (IC50=24 nM for Wee1 and 72 nM for Myt1). PD0166285 is also a novel G2 checkpoint abrogator. PD0166285 induces apoptosis.
PD0166285 is identified to inhibit Wee1 activity at nanomolar concentrations. The inhibitor abrogates G2/M checkpoint inducing early cell division. At the cellular level, 0.5 μM PD0166285 dramatically inhibits irradiation-induced Cdc2 phosphorylation at the Tyr-15 and Thr-14 in seven of seven cancer cell lines tested. This G2 checkpoint abrogation by PD0166285 is demonstrated to kill cancer cells. PD0166285 does not inhibit Cdc2/cyclin B but inhibits Chk1 kinase at a much higher concentration (3433 nM). the treatment of cells with the inhibitor is related to microtubule stabilization and decrease in cyclin D transcription. Thus, PD0166285 may be a potentially useful anti-cancer therapy[1][2].
PD0166285 at 0.5 μM concentration can inhibit Cdc2Y15 /T14 phosphorylation in all cell lines tested, regardless of their p53 status[1] and pharmacological targeting of WEE1 by PD0166285 sensitizes U251-FM GBM tumors to IR in vivo[3].
[1] Wang Y, et al. Cancer Res. 2001, 61(22):8211-8217. [2] Hashimoto O, et al. BMC Cancer. 2006, 6:292. [3] Mir SE, et al. Cancer Cell. 2010, 18(3):244-257.