product name GSK923295
Description: GSK923295, also known as GSK-923295A, is a novel, first-in-class, specific allosteric inhibitor of CENP-E kinesin motor ATPase with Ki of 3.2 nM, and less potent to mutant I182 and T183. GSK-923295 is an antimitotic inhibitor of centromere-associated protein E (CENP-E) with potential anticancer activity. GSK923295A demonstrated significant antitumor activity against solid tumor models, inducing CRs in Ewing sarcoma, rhabdoid, and rhabdomyosarcoma xenografts.
References: Proc Natl Acad Sci U S A. 2010 Mar 30;107(13):5839-44; Pediatr Blood Cancer. 2012 Jun;58(6):916-23.
592.13
Formula
C32H38ClN5O4
CAS No.
1088965-37-0
Storage
-20℃ for 3 years in powder form
-80℃ for 2 years in solvent
Solubility (In vitro)
DMSO: 100 mg/mL (168.9 mM)
Water: <1 mg/mL
Ethanol: 100 mg/mL (168.9 mM)
Solubility (In vivo)
Synonyms
other peoduct :
| In Vitro |
In vitro activity: 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. Kinase Assay: Kinesin motor domains are expressed in Escherichia coli BL21(DE3) and purified. CENP-E proteins includes residues 2–340 with a carboxyl-terminal 6-his tag. All studies using MT are conducted in PEM25 buffer [25mM PipesK+ (pH 6.8), 2mM MgCl2, 1mM EGTA] supplemented with 10 μM paclitaxel. The IC50 for steady-state inhibition is determined at 500 μM ATP, 5 μM MT, and 1 nM CENP-E in PEM25 buffer. Cell Assay: Cell-growth inhibition assays are performed by MDS in 384-well plates, and DNA content of fixed cells stained with DAPI using an Incell 1000 is analyzed. DNA content is determined 24 h after seeding (T0) and after exposure to varying concentrations of drug for an additional 72 h (T72). All T72 measurements are normalized to T0. Curves are analyzed using the XLfit curve-fitting tool to determine the concentration of GSK923295 yielding 50% growth inhibition relative to T0 and Ymax values (GI50). |
|---|---|
| In Vivo | 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. |
| Animal model | Mice bearing xenografts of the Colo205 colon tumor-cell line |
| Formulation & Dosage | Dissolved in 4% N,N-dimethylacetamide (DMA)/Cremaphore (50/50) at pH 5.6; 125 mg/kg; i.p. injection |
| References | Proc Natl Acad Sci U S A. 2010 Mar 30;107(13):5839-44; Pediatr Blood Cancer. 2012 Jun;58(6):916-23. |
