In vitro: ON123300 is a novel kinase inhibitor, inhibits CDK4/6 and PI3K-δ and exhibits potent activity against mantle cell lymphomas (MCLs). ON123300 is a low molecular weight multi-kinase inhibitor identified through a series of screens that supported further analyses for brain tumor chemotherapy. Biochemical assays indicated ON123300 was a strong inhibitor of Ark5 and CDK4 as well as growth factor receptor tyrosine kinases such as Beta-type platelet-derived growth factor receptor [PDGFRβ]. ON123300 inhibited U87 glioma cell proliferation with an IC50 = 3.4 ± 0.1 μM and reduced phosphorylation of Akt, yet it also unexpectedly induced Erk activation; both in a dose- and time-dependent manner that subsequently was attributed to relieving Akt-mediated C-Raf S259 inactivation and activating a p70S6K initiated PI3K negative feedback loop.
| Cell Experiment | |
|---|---|
| Cell lines | MM1.S and NCI-H929 cells |
| Preparation method | MM1.S and NCI-H929 cells were treated with ON123300/PD-0332991 for 24 hours. Approximately 106 cells of each cell line were harvested (along with untreated controls) after 24 hours of treatment in 12-well plates. Cells were washed with PBS and resuspended in appropriate volume of Annexin binding buffer and then stained with Annexin V Pacific Blue/PI. |
| Concentrations | 50 nmol/L |
| Incubation time | 24 h |
| Animal Experiment | |
|---|---|
| Animal models | |
| Formulation | |
| Dosages | |
| Administration | |
| Molecular Weight | 429.52 |
| Formula | C24H27N7O |
| CAS Number | 1357470-29-1 |
| 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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