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Catalog No.S1452 Synonyms: CK0238273
CAS No. 336113-53-2
Ispinesib (SB-715992, CK0238273) is a potent, specific and reversible inhibitor of kinesin spindle protein (KSP) with Ki app of 1.7 nM in a cell-free assay, no inhibition to CENP-E, RabK6, MCAK, MKLP1, KHC or Kif1A. Ispinesib induces mitotic arrest and apoptotic cell death. Phase 2.
Selleck's Ispinesib (SB-715992) has been cited by 23 publications
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|Description||Ispinesib (SB-715992, CK0238273) is a potent, specific and reversible inhibitor of kinesin spindle protein (KSP) with Ki app of 1.7 nM in a cell-free assay, no inhibition to CENP-E, RabK6, MCAK, MKLP1, KHC or Kif1A. Ispinesib induces mitotic arrest and apoptotic cell death. Phase 2.|
|Features||An allosteric, potent, specific, and reversible inhibitor of the mitotic kinesin spindle protein (KSP) (HsEg5).|
Ispinesib is a potent, allosteric, reversible, and specific inhibitor of KSP, which changes the binding property of KSP to microtubules and disturbs its movement by inhibiting ADP release without altering the release of the KSP-ADP complex from the microtubule.  Ispinesib shows potent cytotoxic activity in a panel of tumor cell lines, including Colo205, Colo201, HT-29, M5076, Madison-109, and MX-1, with IC50 of 1.2 nM to 9.5 nM.  In PC-3 prostate cancer cells, Ispinesib (15 nM and 30 nM) blocks cell proliferation and induces apoptosis by regulating the expression levels of genes that controls apoptosis, cell proliferation, cell cycle, and cell signaling, such as EGFR, p27, p15, and IL-11.  In a panel of 53 breast cell lines, Ispinesib (7.4 nM–600 nM) demonstrates broad inhibitory activity. In BT-474 and MDA-MB-468 cells, Ispinesib (150 nM) induces apoptosis, as revealed by a higher proportion of apoptotic cells, lower antiapoptotic Bcl-XL level, and higher proapoptotic Bax and Bid levels. 
|In vivo||Ispinesib (4.5 mg/kg–15 mg/kg) exhibits inhibitory effects against Colo205, Colo201, HT-29, but not MX-1 cells, in mouse xenograft models. SB-715992 (6 mg/kg–10 mg/kg ) also inhibits murine solid tumors, including Madison 109 lung carcinoma, M5076 sarcoma, as well as L1210 and P388 leukemias.  In mice xenograft models of breast cancer cells MCF-7, HCC1954, MDA-MB-468, and KPL4, Ispinesib (8 mg/kg–10 mg/kg) inhibits tumor growth. |
Steady-State Kinetic Analysis of Human KSP ATPase Activity and Inhibition by Ispinesib:Kinesin specificity analysis is carried out using a pyruvate kinase-lactate dehydrogenase detection system that couples the production of ADP to oxidation of NADH. Absorbance changes are monitored at 340 nm. Steady-state studies using nanomolar concentrations of KSP are performed using a sensitive fluorescence-based assay utilizing a pyruvate kinase, pyruvate oxidase, and horseradish peroxidase (HRP) coupled detection system that couples the generation of ADP to oxidation of Amplex Red to fluorescent resorufin. Generation of resorufin is monitored by fluorescence (λexcitation = 520 nm and λemission = 580 nm). Steady-state biochemical experiments are performed in PEM25 buffer [25 mM Pipes-K+ (pH 6.8), 2 mM MgCl2, 1 mM EGTA] supplemented with 10 µM paclitaxel for experiments involving microtubules. The IC50 for steady-state inhibition is determined at 500 µM ATP, 5 µM Microtubules, and 1 nM KSP in PEM25 buffer. Ki app (apparent inhibitor dissociation constant) values of Ispinesib are extracted from the dose-response curves, with explicit correction for enzyme concentration by using the Morrison equation. Inhibitor modality (e.g., competitive, noncompetitive, uncompetitive, or mixed) under steady-state conditions is determined by measuring the effect of inhibitor concentration on initial velocity as a function of substrate concentrations. Data are fit using equations in GraFit to velocity equations for the various modes of inhibition.
|In vitro||DMSO||103 mg/mL (199.2 mM)|
|Ethanol||103 mg/mL (199.2 mM)|
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Clinical Trial Information
|NCT Number||Recruitment||interventions||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT00607841||Terminated||Drug: Ispinesib||Breast Neoplasms||Cytokinetics||December 2007||Phase 1|
|NCT00354250||Completed||Drug: ispinesib||Recurrent Renal Cell Cancer|Stage III Renal Cell Cancer|Stage IV Renal Cell Cancer||National Cancer Institute (NCI)||May 2006||Phase 2|
|NCT00119171||Completed||Drug: Ispinesib|Drug: Capecitabine||Solid Tumor Cancer||GlaxoSmithKline||November 2004||Phase 1|
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