Volasertib (BI 6727) trihydrochloride is a dihydropteridinone derivative that exhibits potent and selective inhibition of Polo-like kinase 1 (PLK1), PLK2, and PLK3. It acts as an orally active ATP-competitive inhibitor with an IC50 of 0.87 nM against PLK1. Additionally, Volasertib trihydrochloride demonstrates IC50 values of 5 nM and 56 nM against PLK2 and PLK3, respectively. Its mechanism of action includes inducing mitotic arrest and apoptosis. Furthermore, Volasertib trihydrochloride has been shown to possess significant antitumor activity in various cancer models.
PHA-680626 is a potent and selective PLK inhibitor. PHA-680626 exhibits anti-proliferative and pro-apoptotic activity on Imatinib-resistant chronic myeloid leukemia cell lines and primary CD34+ cells by inhibition of both Bcr-Abl tyrosine kinase and Aurora kinases. PHA-680626 inhibits Plk1 (IC50 = 0.53 μM), Plk2 (IC50 = 0.07 μM) and Plk3 (IC50 = 1.61 μM).
Poloxipan is a potent and pan-specific PLK1 inhibitor. In vitro, Poloxipan has IC50 3.2 uM (Plk1); 1.7 uM (Plk2); and 3 uM (Plk3). Poloxipan showed minor inhibition over FHA dommain of Chk2, S2 domian of STAT1, STAT5b, Lck, etc.