GSK1070916

Catalog No.S2740

GSK1070916 is a reversible and ATP-competitive inhibitor of Aurora B/C with IC50 of 3.5 nM/6.5 nM. It displays >100-fold selectivity against the closely related Aurora A-TPX2 complex. Phase 1.

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GSK1070916 Chemical Structure

GSK1070916 Chemical Structure
Molecular Weight: 507.63

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Product Information

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  • Research Area
  • Inhibition Profile

Product Description

Biological Activity

Description GSK1070916 is a reversible and ATP-competitive inhibitor of Aurora B/C with IC50 of 3.5 nM/6.5 nM. It displays >100-fold selectivity against the closely related Aurora A-TPX2 complex. Phase 1.
Targets Aurora B-INCENP [1] Aurora C-INCENP [1] FLT1 [1] Tie-2 [1]

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IC50 3.5 nM 6.5 nM 42 nM 59 nM
In vitro GSK1070916 selectively inhibits Aurora B and Aurora C with Ki of 0.38 nM and 1.5 nM over Aurora A with Ki of 490 nM. Inhibition of Aurora B and Aurora C is time-dependent, with an enzyme-inhibitor dissociation half-life of >480 min and 270 min respectively. In addition, GSK1070916 is also a competitive inhibitor with respect to ATP. [1] Human tumor cells treated with GSK1070916 shows dose-dependent inhibition of phosphorylation on serine 10 of Histone H3, a substrate specific for Aurora B. Moreover, GSK1070916 inhibits the proliferation of tumor cells with EC50 values of <10 nM in over 100 cell lines spanning a broad range of tumor types, with a median EC50 of 8 nM. Although GSK1070916 has potent activity against proliferating cells, a dramatic shift in potency is observed in primary, nondividing, normal human vein endothelial cells. Furthermore, GSK1070916-treated cells do not arrest in mitosis but instead fails to divide and become polyploid, ultimately leading to apoptosis. [2] In another study, it is also reported high chromosome number associated with resistance to the inhibition of Aurora B and C suggests cells with a mechanism to bypass the high ploidy checkpoint are resistant to GSK1070916. [3]
In vivo GSK1070916 (25, 50, or 100 mg/kg) shows dose-dependent inhibition of phosphorylation of an Aurora B–specific substrate in mice and consistent with its broad cellular activity, has antitumor effects in 10 human tumor xenograft models including breast, colon, lung, and two leukemia models. [2]
Features

Protocol(Only for Reference)

Kinase Assay: [1]

Kinase Assay The ability of GSK1070916 to inhibit the Aurora enzymes is measured using in vivo kinase assays. The assays measure the ability of Aurora A, Aurora B and Aurora C to phosphorylate a synthetic peptide substrate. Biotin-Ahx-RARRRLSFFFFAKKK-NH2 is used for the Aurora A–TPX2 LEADseekerTM assay and 5FAM-PKAtide is used for the IMAPTM assay for all three Aurora kinases. To take into account time-dependent inhibition of Aurora enzymes, Aurora A–TPX2, Aurora B–INCENP and Aurora C–INCENP are incubated with GSK1070916 at various concentrations for 30 min before the reactions are initiated with the addition of substrates. For the Aurora A LEADseekerTM assay, final assay conditions are 0.5 nM Aurora A–TPX2, 1 μM peptide substrate, 6 mM MgCl2, 1.5 μM ATP, 0.003 μCi/μL [γ-33P] ATP in 50 mM Hepes, pH 7.2, 0.15 mg/mL BSA, 0.01% Tween-20, 5 mM DTT and 25 mM KCl. The reactions are incubated at room temperature (25 °C) for 120 min and terminated by the addition of LEADseekerTM beads in PBS containing EDTA (final concentration 2 mg/mL beads and 25 mM EDTA). The plates are then sealed, and the beads are allowed to settle overnight. Product formation is quantified using a Viewlux Imager. For the IMAPTM assays, Aurora A–TPX2 (final concentration 1 nM), Aurora B–INCENP (final concentration 2 nM) or Aurora C–INCENP (final concentration 2.5 nM) is added to the compound-containing plates in 5 μL of buffer (25 mM Hepes, pH 7.2, for Aurora A, 25 mM Hepes, pH 7.5, for Aurora B and 20 mM Hepes, pH 7.2, for Aurora C) containing 0.15 mg/mL BSA, 0.01% Tween 20 and 25 mM NaCl. This mixture is incubated at room temperature for 30 min. To start the reaction, 5 μL of a substrate solution is added containing the same Hepes buffer as used for the pre-incubation, 25 mM NaCl, MgCl2 (2, 4 and 4 mM for Aurora A, B and C respectively), DTT (4, 4 and 2 mM for Aurora A, B and C respectively), ATP (4, 4 and 10 μM for Aurora A, B and C respectively), 200 nM 5FAM-PKAtide, 0.01% Tween 20 and 0.15 mg/mL BSA. The reactions are incubated at room temperature for 120 min for Aurora A and B and 60 min for Aurora C. These reactions are then terminated by the addition of 10 μL of 1:500 (1:600 for Aurora C) Progressive Binding Reagent in 95% Progressive Binding Buffer A and 5% Progressive Binding Buffer B. Plates are incubated at room temperature for approx. 90–120 min (time allowed for equilibrium to be reached). Plates are read in a Molecular Devices Analyst plate reader in fluorescence polarization mode.

Cell Assay: [2]

Cell lines SW48, Colo 201, SW480, WiDr, Colo205, RKO E6, RKO, LoVo, HCT-116, SW620, HT29, W1417, DLD-1, HCT-8, Colo 320HSR, Hep-3B, OVCAR-3, MEC-1 cells
Concentrations 0-15 mM
Incubation Time 6-7 days
Method Cells are plated in 96-well plates in the recommended growth media and incubated at 37 °C in 5% CO2 overnight. The following day, the cells are treated with serial dilutions of GSK1070916. At this time, one set of cells is treated with CellTiter-Glo for a time equal to 0 (T = 0) measurement. Following a 6- to 7-d incubation with compound, cell proliferation is measured using the CellTiter-Glo reagent according to the manufacture's recommended protocol. As inhibition of Aurora B induces endomitosis, the degree of which differs depending on the cell type, an extended compound treatment time is required to accurately reflect the effects on cell viability across a large panel of cell lines. For analysis of cell viability, values from wells with no cells are subtracted for background correction and the data plotted as a percent of the DMSO-treated control samples using Microsoft Excel XLfit4 software. The EC50 values represent the concentration of GSK1070916 where 50% maximal effect is observed

Animal Study: [2]

Animal Models Mice tumor xenograft models (A549, SW620, HCT116, H460, MCF-7, HL60, K562, Colo205)
Formulation 2% Cremophor EL, 2% N,N-dimethylacetamide, and 96% acidified water (pH 5.0)
Dosages 25, 50, or 100 mg/kg
Administration Administered via i.p. once daily

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)0.020.151.80.40.0810
Body Surface Area (m2)0.0070.0250.150.050.020.5
Km factor36128520
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)
1

References

[1] Anderson K, et al. Biochem J, 2009, 420(2), 259-265.

[2] Hardwicke MA, et al. Mol Cancer Ther, 2009, 8(7),1808-1817.

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Clinical Trial Information( data from http://clinicaltrials.gov, updated on 2016-07-30)

NCT Number Recruitment Conditions Sponsor
/Collaborators
Start Date Phases
NCT01118611 Completed Unspecified Adult Solid Tumor, Protocol Specific Cancer Research UK March 2010 Phase 1

Chemical Information

Download GSK1070916 SDF
Molecular Weight (MW) 507.63
Formula

C30H33N7O

CAS No. 942918-07-2
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms N/A
Solubility (25°C) * In vitro DMSO 102 mg/mL (200.93 mM)
Ethanol 102 mg/mL (200.93 mM)
Water <1 mg/mL
In vivo 2% Cremophor EL, 2% N,N-dimethylacetamide, pH 5.0 30 mg/mL
* <1 mg/ml means slightly soluble or insoluble.
* 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 Name 3-(4-(4-(2-(3-((dimethylamino)methyl)phenyl)-1H-pyrrolo[2,3-b]pyridin-4-yl)-1-ethyl-1H-pyrazol-3-yl)phenyl)-1,1-dimethylurea

Tech Support

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
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