In vitro: CFI-402257 is highly selective to TTK. CFI-402257 is tested against a panel of human kinases at 1 μM and inhibits none of the 262 kinases tested. CFI-402257 is a potent inhibitor of cell growth. CFI-402257 shows strong antineoplastic activity on a broad panel of human cancer-derived cell lines, and causes effects consistent with depletion or inhibition of Mps1. CFI-402257 inhibits Mps1 with an IC50 value of 1.2 nM, and is ATP competitive with a Ki value of 0.09 nM. CFI-402257 inhibits autophosphorylation of Mps1 at threonine 12/serine 15 with an EC50 value of 6.5 nM in cells exogenously expressing human Mps1. CFI-402257 exerts potent growth inhibitory activity across the vast majority of cell lines with a median IC50 value of 15 nM. In vivo: The upper dose level for once-daily administration of CFI-402257 is between 6 and 6.5 mg/kg. CFI-402257 given orally QD shows dose-dependent activity in mice with established tumors from xenografted MDA-MB-231 human TNBC cells [5 mg/kg CFI-402257, tumor growth inhibition (TGI)=74%; 6 mg/kg, TGI=89%], from xenografted MDA-MB-468 human TNBC cells in mice (5 mg/kg, TGI=75%; 6 mg/kg, TGI=94%). CFI-402257 also demonstrates antitumor activity in a platinum-resistant PDX model of high-grade serous ovarian cancer (6.5 mg/kg, TGI=61%). CFI-402257 is found to be similarly efficacious in a platinum-sensitive PDX model of high-grade serous ovarian cancer.
| Cell Experiment | |
|---|---|
| Cell lines | HCT116 cells |
| Preparation method | Cells were pretreated with 0.5 μM MG132 for 30 min before treatment with CFI-402257 or DMSO for 4 h. For cellular histone H3 (S10) EC50 determination, HCT116 cells were treated with 200 ng/mL nocodazole for 17 h before treatment with CFI-402257 or DMSO for 4 h. |
| Concentrations | 10 μM |
| Incubation time | 17 h |
| Animal Experiment | |
|---|---|
| Animal models | CD-1 nude mice |
| Formulation | 10% (vol/vol) NMP/40% (vol/vol) PEG-300/50% (vol/vol) water |
| Dosages | 10, 25, and 55 mg/kg |
| Administration | oral |
| Molecular Weight | 498.58 |
| Formula | C28H30N6O3 |
| CAS Number | 1610759-22-2 |
| Solubility (25°C) | 10 mM in DMSO |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| 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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