Tozasertib (VX-680, MK-0457) is a small-molecule Aurora kinase inhibitor. The Aurora kinases are essential for the regulation of chromosome segregation and cytokinesis during mitosis. Tozasertib (VX-680) blocks cell-cycle progression and induces apoptosis in a diverse range of human tumor types. Tozasertib (VX-680) effectively inhibits proliferation of several different cell lines of clear cell renal carcinoma (IC50s < 10 μM) and blocks the growth of tumors in a rodent model of cancer (80 mg/kg), inhibiting H3 histone phosphorylation, to an increase of apoptotic cells, and to morphological changes such as vacuolization and swelling of the cells and nuclei. The combination of VX-680 and histone deacetylase inhibitor SAHA had a synergistic effect on the proliferation of HUH6 cells. Tozasertib (VX-680) might improve treatment results in HB with increased Aurora kinase activity by inhibiting cell proliferation and induction of apoptosis.
J Hematol Oncol. 2017 Jun 8;10(1):115.
SIX3, a tumor suppressor, inhibits astrocytoma tumorigenesis by transcriptional repression of AURKA/B
Tozasertib purchased from AbMole
Cell Experiment | |
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Cell lines | SW620, K562, HL-60, MIA PaCa-2 and HCT116 cells |
Preparation method | Analysis of cell proliferation and viability. Tumor cells were seeded in 96-well plates and incubated with VX-680 for 96 h. To measure DNA synthesis, 0.5 mCi of [3H]thymidine was added to each well 3 h before the end of the experiment. Cells were then collected, and the incorporated radioactivity was counted on a Wallac microplate beta-counter. Cell viability was assessed using Promega CellTiter 96AQ to measure MTS (3-(4,5 dimethylthiazol-2-yl)-5-(3- carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt) conversion. |
Concentrations | 1~10 μM |
Incubation time | 96 h |
Animal Experiment | |
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Animal models | female athymic NCr-nu mice HL-60, MIA PaCa-2 and HCT116 cells tumour xenograft model |
Formulation | 50% PEG 300 in 50 mM phosphate buffer |
Dosages | q.4.d. at a dose of 12.5, 25, 50 and 75 mg/kg |
Administration | i.v. |
Molecular Weight | 464.59 |
Formula | C23H28N8OS |
CAS Number | 639089-54-6 |
Solubility (25°C) | DMSO 75 mg/mL |
Storage | 2-8°C, protect from light, dry, sealed |
Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
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.
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AAPK-25 is a potent and selective Aurora/PLK dual inhibitor with anti-tumor activity, which can cause mitotic delay and arrest cells in a prometaphase, reflecting by the biomarker histone H3Ser10 phosphorylation and followed by a surge in apoptosis. AAPK-25 targets Aurora-A, -B, and -C with Kd values ranging from 23-289 nM, as well as PLK-1, -2, and -3 with Kd values ranging from 55-456 nM. |
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