GSK-923295

CENP-E

592.13

DMSO 100 mg/mL (168.88 mM)
Ethanol 100 mg/mL (168.88 mM)

Powder

GSK923295 is the first potent and selective inhibitor of the mitotic kinesin centromere-associated protein-E (CENP-E). GSK923295 is uncompetitive with both ATP and microtubules (MT), inhibiting CENP-E MT-stimulated ATPase activity with a Ki of 3.2 nM, highly selective over other kinesins. GSK923295 inhibits release of inorganic phosphate and stabilizes CENP-E motor domain interaction with microtubules, reduces the rate of ATP-promoted dissociation of CENP-E from MT (koff, MT) by more than 50-fold. GSK923295 causes failure of metaphase chromosome alignment and induces mitotic arrest. GSK923295 is a potent inhibitor of tumor cell growth, with an average GI50 of 253 nM and a median GI50 of 32 nM for 237 tumor cell lines. GSK923295 inhibits tumor cell growth more effectively when mitogen-activated protein kinase (MEK/ERK) signaling is also inhibited.

GSK923295 produces clear increases in the abundance of mitotic figures and scattered apoptotic bodies in tumors. GSK923295 causes a dose-dependent increase in the ratio of 4n to 2n nuclei. GSK923295 exhibits robust, dose-dependent antitumor activity against Colo205 xenografts, including partial and complete regressions at the 125 mg/kg dose. GSK923295 demonstrates significant antitumor activity against solid tumor models, inducing CRs in Ewing sarcoma, rhabdoid, and rhabdomyosarcoma xenografts, may be a valuable therapeutic target in pediatric cancer.

GSK-923295,GSK923295

C₃₂H₃₈ClN₅O₄

1088965-37-0