In vitro: In HCT116 colorectal carcinoma cell line, with intact or depleted p53 protein levels, SNS-314 shows enhanced efficacy when administered sequentially with other standard chemotherapeutic agents and the most profound synergies are identified for agents that activate the spindle assembly checkpoint, e.g., docetaxel and vincristine. A recent study shows that SNS-314 shows potent antiproliferative activity in HCT116 cells and inhibits soft agar colony formation.
In vivo: The sequential treatment with SNS-314 followed by docetaxel 24 hours later produces a significant 72.5% tumor growth inhibition of HCT116 xenografts, while docetaxel and SNS-314 as single agents produce no significant inhibition of HCT116 tumor growth. In the HCT116 human colon cancer xenograft model, administration of 50 and 100 mg/kg SNS-314 results a dose-dependent inhibition of histone H3 phosphorylation, indicating effective Aurora-B inhibition in vivo. In addition, HCT116 tumors from animals treated with SNS-314 exhibits potent and sustained responses including reduction of phosphorylated histone H3 levels, increased caspase-3 and appearance of increased nuclear size.
|Cell lines||HCT116 SCR and HCT116 p53 RNAi cells|
|Preparation method||Viability is measured using the CellTiter-Blue cell viability assay. Cells are treated as described above, although with a 5-day incubation period. Cytotoxicity is determined by measuring intracellular ATP using the CellTiter-Glo Luminescence Cell Viability Assay. Cells are seeded in white 96-well tissue culture plates at a density of 1.5-2 × 103 cells/well, and a serial dilution of SNS-314 is dosed in combination with fixed concentrations of either docetaxel or vincristine for a total of 72 hours. Viability is determined as the ratio between the ATP in treated cells versus control cells. Apoptosis is measured using the caspase-Glo 3/7 system. Cells are plated in white 96-well plates as described above and treated first with SNS-314 for 24 hours, washed with 200 μL of 1× PBS, and fresh medium is added with the second agent for 24 hours.|
|Incubation time||48 h|
|Animal models||HCT116 cells are injected s.c. into the right flank of nu/nu mice|
|Formulation||20% Captisol R|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 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 Compound A of 10 mg/kg.
|Solubility||DMSO 90 mg/mL|
|Related Aurora Kinase Products|
LY3295668 (AK-01) is a potent, orally active and highly specific Aurora-A kinase inhibitor, with Ki values of 0.8 nM and 1038 nM for AurA and AurB, respectively.
|Aurora Kinase Inhibitor III
Aurora Kinase Inhibitor III is a strong and selective Aurora A kinase inhibitor with an IC50 of 42 nM.
SNS-314 Mesylate is a potent and selective inhibitor of Aurora A, Aurora B and Aurora C with IC50 of 9 nM, 31 nM, and 3 nM, respectively.
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.
PHA-680632 is potent inhibitor of Aurora A, Aurora B and Aurora C with IC50 of 27 nM, 135 nM and 120 nM, respectively. It has 10- to 200-fold higher IC50 for FGFR1, FLT3, LCK, PLK1, STLK2, and VEGFR2/3.
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