Home Cytoskeletal Signaling Kinesin inhibitor - Apoptosis related activator Ispinesib (SB-715992) For research use only.

Ispinesib (SB-715992)

Synonyms: CK0238273

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.

Ispinesib (SB-715992) Chemical Structure

Ispinesib (SB-715992) Chemical Structure

CAS No. 336113-53-2

Purity & Quality Control

Ispinesib (SB-715992) Related Products

Signaling Pathway

Kinesin Signaling Pathways

Kinesin Signaling Pathway

Cell Data

Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
HCT116 Antiproliferative assay 72 hrs Antiproliferative activity against human HCT116 cells after 72 hrs by Alamar blue assay, GI50=0.025μM 22248262
hTERT-HME1 Antiproliferative assay 72 hrs Antiproliferative activity against human hTERT-HME1 cells after 72 hrs by Alamar blue assay, GI50=0.032μM 22248262
K562 Antiproliferative assay 72 hrs Antiproliferative activity against human K562 cells after 72 hrs by Alamar blue assay, GI50=0.071μM 22248262
BxPC3 Antiproliferative assay 72 hrs Antiproliferative activity against human BxPC3 cells after 72 hrs by Alamar blue assay, GI50=0.08μM 22248262
NCI-H1299 Antiproliferative assay 72 hrs Antiproliferative activity against human NCI-H1299 cells after 72 hrs by Alamar blue assay, GI50=0.082μM 22248262
LNCAP Growth inhibition assay 72 hrs Growth inhibition of human LNCAP cells after 72 hrs by Alamar blue assay, GI50=0.022μM 23394180
HCT116 Growth inhibition assay 72 hrs Growth inhibition of human HCT116 cells after 72 hrs by Alamar blue assay, GI50=0.025μM 23394180
PC3 Growth inhibition assay 72 hrs Growth inhibition of human PC3 cells after 72 hrs by Alamar blue assay, GI50=0.05μM 23394180
BxPC3 Growth inhibition assay 72 hrs Growth inhibition of human BxPC3 cells after 72 hrs by Alamar blue assay, GI50=0.08μM 23394180
NCI-H1299 Growth inhibition assay 72 hrs Growth inhibition of human NCI-H1299 cells after 72 hrs by Alamar blue assay, GI50=0.082μM 23394180
LXFS 538 Antitumor assay 6 mg/kg Antitumor activity against human LXFS 538 cells xenografted in NMRI nu/nu mouse assessed as tumor regression at 6 mg/kg, ip measured on day 13 23394180
HeLa Antiproliferative assay 48 hrs Antiproliferative activity against human HeLa cells after 48 hrs by MTT assay, IC50=1μM 24184776
MCF7 Antiproliferative assay 48 hrs Antiproliferative activity against human MCF7 cells after 48 hrs by MTT assay, IC50=1.3μM 24184776
HCT116 Growth inhibition assay 72 hrs Growth inhibition of human HCT116 cells after 72 hrs by MTS assay, IC50=0.0011μM 26396688
TC32 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for TC32 cells 29435139
DAOY qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for DAOY cells 29435139
SJ-GBM2 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells 29435139
A673 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells 29435139
SK-N-MC qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells 29435139
NB-EBc1 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells 29435139
Saos-2 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Saos-2 cells 29435139
LAN-5 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for LAN-5 cells 29435139
BT-12 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-12 cells 29435139
OHS-50 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells 29435139
A673 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for A673 cells) 29435139
SK-N-MC qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SK-N-MC cells 29435139
BT-12 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for BT-12 cells 29435139
DAOY qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for DAOY cells 29435139
BT-37 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for BT-37 cells 29435139
TC32 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for TC32 cells 29435139
MG 63 (6-TG R) qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for MG 63 (6-TG R) cells 29435139
U-2 OS qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for U-2 OS cells 29435139
Rh41 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh41 cells 29435139
RD qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for RD cells 29435139
Rh30 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh30 cells 29435139
Saos-2 qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Saos-2 cells 29435139
SK-N-SH qHTS assay qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SK-N-SH cells 29435139
Click to View More Cell Line Experimental Data

Biological Activity

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.
Features An allosteric, potent, specific, and reversible inhibitor of the mitotic kinesin spindle protein (KSP) (HsEg5).
Targets
KSP (HsEg5) [1]
(Cell-free assay)
1.7 nM(Ki app)
In vitro
In vitro

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. [1] 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. [2] 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. [3] 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. [4]
Kinase Assay 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] 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.
Cell Research Cell lines Breast cancer cells, including MCF-7, HCC1954, MDA-MB-468, and KPL4
Concentrations 0.085 nM–33 µM
Incubation Time 72 hours
Method

Cells are plated in log phase of growth in 96-well plates and treated with Ispinesib for 72 hours. Then, cell growth is measured using CellTiter-Glo, and luminescence is detected using BioTek FLx800. Data are analyzed and the IC50 value, defined as the drug concentration that results in 50% growth inhibition relative to control, is calculated.
In Vivo
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. [2] 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. [4]
Animal Research Animal Models Nude (nu/nu) mice models of MCF7, KPL4, and HCC1954 cells; severe combined immunodeficient (SCID) mice model of MDA-MB-468 cells;
Dosages 10 mg/kg for nude mice or 8 mg/kg for SCID mice
Administration Intraperitoneal injection on a q4d× schedule (3 doses, every 4 day
NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT00607841 Terminated
Breast Neoplasms
Cytokinetics
 December 2007 Phase 1
NCT00354250 Completed
Recurrent Renal Cell Cancer|Stage III Renal Cell Cancer|Stage IV Renal Cell Cancer
National Cancer Institute (NCI)
 May 2006 Phase 2
NCT00097409 Completed
Ovarian Cancer
GlaxoSmithKline
 December 2004 Phase 2
NCT00119171 Completed
Solid Tumor Cancer
GlaxoSmithKline
 November 2004 Phase 1

Chemical Information & Solubility

Molecular Weight 517.06 Formula

C30H33ClN4O2
CAS No. 336113-53-2 SDF Download Ispinesib (SB-715992) SDF
Smiles CC1=CC=C(C=C1)C(=O)N(CCCN)C(C2=NC3=C(C=CC(=C3)Cl)C(=O)N2CC4=CC=CC=C4)C(C)C
Storage (From the date of receipt)

In vitro
Batch:

DMSO : 103 mg/mL ( (199.2 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Ethanol : 103 mg/mL

Water : Insoluble


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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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