The Aurora family of serine/threonine kinases (Aurora-A, Aurora-B, and Aurora-C) plays a key role in cells orderly progression through mitosis. SNS-314 is a novel, potent, and selective inhibitor of Aurora kinases A, B, and C[3]. In the HCT116 human colon cancer xenograft model, administration of 50 and 100 mg/kg SNS-314 led to dose-dependent inhibition of histone H3 phosphorylation for at least 10 h, indicating effective Aurora-B inhibition in vivo. HCT116 tumors from animals treated with SNS-314 showed potent and sustained responses including reduction of phosphorylated histone H3 levels, increased caspase-3 and appearance of increased nuclear size. The compound showed significant tumor growth inhibition in a dose-dependent manner under a variety of dosing schedules including weekly, bi-weekly, and 5 days on/9 days off[4]. Treatment of the different ATC cells with SNS-314 mesylate inhibited proliferation in a time- and dose-dependent manner, with IC(50) comprised between 2.6 nM and 26.6 nM. CAL-62 cells exposed for 24 h to SNS-314 mesylate 100 nM evidenced a significant augmentation of the apoptotic index. Time-lapse video-microscopy of CAL-62 cells showed that SNS-314 mesylate prevents the completion of mitosis leading to polyploidy. Western blot experiments demonstrated that the auto-phosphorylation of the Aurora kinases as well as histone H3 phosphorylation in CAL-62 treated cells was inhibited. Finally, the drug inhibited colony formation in soft agar of all cell lines[5]. Combination of Quercetin and SNS-314 leads to a synergistic cytotoxic effect on medullary TT and papillary BCPAP cell lines with a significant reduction of the IC50 value[6].
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