Ribociclib (LEE011) is a highly specific CDK4/6 inhibitor with IC50 values of 10 nM and 39 nM, respectively, and is 1000 times less active against cyclin B/CDK1 complex.
Cell Experiment | |
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Cell lines | MYCN amplified neuroblastoma cell lines |
Preparation method | Pharmacologic growth inhibition LEE011 was provided by Novartis pharmaceuticals. A panel of neuroblastoma cell lines, selected based upon prior demonstration of substrate adherent growth, was plated in triplicate on the Xcelligence Real-Time Cell Electronic Sensing system (ACEA Biosciences) and treated 24 hours later with a four-log dose range of inhibitor or with a DMSO control. Cell indexes were monitored continuously for ~100 hours, and IC50 values were determined as follows: Growth curves were generated by plotting the cell index as a function of time and were normalized to the cell index at the time of treatment for a baseline cell index of 1. The area under the normalized growth curve from the time of treatment to 96 hours post-treatment was then calculated using a baseline area of 1 (the cell index at the time of treatment). Areas were normalized to the DMSO control, and the resulting data were analyzed using a non-linear log inhibitor vs. normalized response function (Graphpad). All experiments were repeated at least once. |
Concentrations | 0~10µM |
Incubation time | 96h |
Animal Experiment | |
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Animal models | BE2C, NB-1643, or EBC1 cell line-derived xenografts of CB17 SCID−/− mice |
Formulation | 0.5 % methylcellulose |
Dosages | 200 mg/kg |
Administration | oral |
Molecular Weight | 434.54 |
Formula | C23H30N8O |
CAS Number | 1211441-98-3 |
Solubility (25°C) | DMSO 10 mg/mL |
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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