Ispinesib (SB-715992)

For research use only.

Catalog No.S1452 Synonyms: CK0238273

16 publications

Ispinesib (SB-715992) Chemical Structure

Molecular Weight(MW): 517.06

Ispinesib (SB-715992) 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.

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10mM (1mL in DMSO) USD 420 In stock
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Selleck's Ispinesib (SB-715992) has been cited by 16 publications

4 Customer Reviews

  • Representative photographs of fluorescent staining of microtubules and nuclei in MDA-MB-231 cells 24 h post-treatment with 4 nM of ispinesib or vinblastine or their combination. Arrows and arrowheads denote mitotic cells with monoploar and bipolar spindles, respectively. Scale bars, 20 um.

    Mol Oncol 2014 8(8), 1548-60. Ispinesib (SB-715992) purchased from Selleck.

  • Original blot images and quantification of NKCC1 protein levels in the plasma membrane and cytosolic fractions of spinal cord slices with vehicle (Ctrl, 0.1% DMSO) or ispinesib (ISP, 1 uM). * p < 0.05; ** p < 0.01, compared with the vehicle control group. Error bars represent the S.E.

    J Biol Chem 2014 289(45), 31111-20. Ispinesib (SB-715992) purchased from Selleck.

  • KB-V1 cells were treated with BEZ235, BI 2536, IKK 16, ispinesib, and bryostatin-1 and then calcein AM (1 uM). Doses of each compound were generated from 1:2 dilutions of the highest concentration of 20 uM. The object intensities were plotted. Data presented are mean ± SD (n = 3).

    PLoS One 2013 8(4), e60334. Ispinesib (SB-715992) purchased from Selleck.

  • Flow cytometry-based efflux assays were performed to examine KB-V1 cells incubated with either calcein AM (1 uM, red line) or calcein AM plus BEZ235, BI 2536, IKK 16, ispinesib, or bryostatin-1 (5 uM, blue line).

    PLoS One 2013 8(4), e60334. Ispinesib (SB-715992) purchased from Selleck.

Purity & Quality Control

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Biological Activity

Description Ispinesib (SB-715992) 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).
KSP (HsEg5) [1]
(Cell-free assay)
1.7 nM(Ki app)
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]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
human HCT116 cells MV7Hdo94fGhiaX7obYJqfGmxbjDhd5NigQ>? MVG3NkBp NIHsOHpIem:5dHigbY5pcWKrdHnvckBw\iCqdX3hckBJS1RzMU[gZ4VtdHNiYX\0[ZIhPzJiaILzJIJ6KE2WUzDhd5NigSxiSVO1NF0yNjFibl2= NIL4dZUzPjN7Nk[4PC=>
human LNCAP cells NUTiWFRHT3Kxd4ToJIlvcGmkaYTpc44h[XO|YYm= NHK2TXc4OiCq MWDHdo94fGhiaX7obYJqfGmxbjDv[kBpfW2jbjDMUmNCWCClZXzsd{Bi\nSncjC3NkBpenNiYomgRYxidWG{IHLseYUh[XO|YYmsJGdKPTB;MD6wNlIh|ryP NXexR2tyOjN|OUSxPFA>
human hTERT-HME1 cells NGXxV21Rem:uaX\ldoF1cW:wIHHzd4F6 M{XUbFczKGh? MlTBRY51cXC{b3zp[oVz[XSrdnWgZYN1cX[rdImgZYdicW6|dDDoeY1idiCqVFXSWE1JVUVzIHPlcIx{KGGodHXyJFczKGi{czDifUBCdGGvYYKgZox2\SCjc4PhfUwhT0l3ME2wMlA{OiEQvF2= MWKyNlI1QDJ4Mh?=
human PC3 cells NEC0N2lIem:5dHigbY5pcWKrdHnvckBie3OjeR?= MoHUO|IhcA>? NG[yS|VIem:5dHigbY5pcWKrdHnvckBw\iCqdX3hckBRSzNiY3XscJMh[W[2ZYKgO|IhcHK|IHL5JGFt[W2jcjDicJVmKGG|c3H5MEBIUTVyPUCuNFUh|ryP MVKyN|M6PDF6MB?=
human K562 cells NIf0eIxRem:uaX\ldoF1cW:wIHHzd4F6 MX63NkBp NYrHO5B1SW62aYDyc4xq\mW{YYTpeoUh[WO2aY\peJkh[WejaX7zeEBpfW2jbjDLOVYzKGOnbHzzJIFnfGW{IEeyJIhzeyCkeTDBcIFu[XJiYnz1[UBie3OjeTygS2k2OD1yLkC3NUDPxE1? Ml;BNlIzPDh{NkK=
human BxPC3 cells NGntOGVIem:5dHigbY5pcWKrdHnvckBie3OjeR?= NWPQfJN7PzJiaB?= MmOzS5Jwf3SqIHnubIljcXSrb36gc4YhcHWvYX6gRphRSzNiY3XscJMh[W[2ZYKgO|IhcHK|IHL5JGFt[W2jcjDicJVmKGG|c3H5MEBIUTVyPUCuNFgh|ryP MYGyN|M6PDF6MB?=
human BxPC3 cells MlLOVJJwdGmoZYLheIlwdiCjc4PhfS=> M2jPS|czKGh? MVTBcpRqeHKxbHnm[ZJifGm4ZTDhZ5Rqfmm2eTDh[4FqdnO2IHj1cYFvKEK6UFOzJINmdGy|IHHmeIVzKDd{IHjyd{BjgSCDbHHtZZIh[my3ZTDhd5NigSxiR1m1NF0xNjB6IN88US=> M1jteFIzOjR6Mk[y
human NCI-H1299 M2Liemdzd3e2aDDpcohq[mm2aX;uJIF{e2G7 M{DONVczKGh? NVzIOohyT3Kxd4ToJIlvcGmkaYTpc44hd2ZiaIXtZY4hVkOLLVixNlk6KGOnbHzzJIFnfGW{IEeyJIhzeyCkeTDBcIFu[XJiYnz1[UBie3OjeTygS2k2OD1yLkC4NkDPxE1? MkXmNlM{QTRzOEC=
human NCI-H1299 cells M1HlcHBzd2yrZnXyZZRqd25iYYPzZZk> NYX4Tm1FPzJiaB?= M1jOZWFvfGmycn;sbYZmemG2aY\lJIFkfGm4aYT5JIFo[Wmwc4SgbJVu[W5iTlPJMWgyOjl7IHPlcIx{KGGodHXyJFczKGi{czDifUBCdGGvYYKgZox2\SCjc4PhfUwhT0l3ME2wMlA5OiEQvF2= M4DzNlIzOjR6Mk[y
human HeLa cells NWPFeItxWHKxbHnm[ZJifGmxbjDhd5NigQ>? Ml;MOFghcA>? MY\BcpRqeHKxbHnm[ZJifGm4ZTDhZ5Rqfmm2eTDh[4FqdnO2IHj1cYFvKEinTHGgZ4VtdHNiYX\0[ZIhPDhiaILzJIJ6KE2WVDDhd5NigSxiSVO1NF0yKM7:TR?= MVmyOFE5PDd5Nh?=
MCF7 cells NVf5O|Y5WHKxbHnm[ZJifGmxbjDhd5NigQ>? MWe0PEBp MWTBcpRqeHKxbHnm[ZJifGm4ZTDhZ5Rqfmm2eTDh[4FqdnO2IHj1cYFvKE2FRkegZ4VtdHNiYX\0[ZIhPDhiaILzJIJ6KE2WVDDhd5NigSxiSVO1NF0yNjNizszN NHHSdpozPDF6NEe3Oi=>

... Click to View More Cell Line Experimental Data

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]


Kinase Assay:[1]
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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.
Cell Research:[4]
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  • 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.
    (Only for Reference)
Animal Research:[4]
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  • 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
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 103 mg/mL (199.2 mM)
Water Insoluble
Ethanol '103 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 517.06


CAS No. 336113-53-2
Storage powder
in solvent
Synonyms CK0238273
Smiles CC(C)C(N(CCCN)C(=O)C1=CC=C(C)C=C1)C2=NC3=C(C=CC(=C3)Cl)C(=O)N2CC4=CC=CC=C4

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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
NCT00097409 Completed Drug: Ispinesib Ovarian Cancer GlaxoSmithKline December 2004 Phase 2
NCT00119171 Completed Drug: Ispinesib|Drug: Capecitabine Solid Tumor Cancer GlaxoSmithKline November 2004 Phase 1

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID