Crenolanib (CP-868596)

Cell Assay [2]
Viable cell numbers following drug treatment are measured using the WST-1 assay. Briefly, 1×103 cells are seeded in 100 μL complete medium per well in 96-well tissue culture plates and incubated with crenolanib (0-10 μM) at 37°C in 5% CO2 for 96 h. 10 μL WST-1 reagent is then added to each well, incubation is continued for two additional hours and the color developed is quantified according to the manufacturer’s instructions. Each experiment is performed in triplicate. IC50 concentrations are calculated by the least square fit of dose–response inhibition in a non-linear regression model using GraphPad Prism V software.

Animal Administration [3]
A549 cells are injected into the axillary regions of mice (2×106 cells/mouse). When the tumor volumes reached 70 mm3, the mice are randomLy allocated to the control group, low-dose crenolanib group (10 mg/kg), or high-dose crenolanib group (20 mg/kg) (n=6 per group). The vehicle for crenolanib treatment consists of 10% 1-methyl-2-pyrrolidinone and 90% polyethylene glycol 300. The tumor size and mouse body weight are measured every other day for about 2 weeks. The tumor volume is calculated as follows: (mm3)=(width×width×length)/2. After treatment, the mice are euthanized using carbon dioxide, and the tumors are harvested and analyzed.

References:
[1]. Heinrich MC, et al.Crenolanib inhibits the drug-resistant PDGFRA D842V mutation associated with imatinib-resistant gastrointestinal stromal tumors. Clin Cancer Res, 2012, Jun 27. [2]. Mathias TJ, et al. The FLT3 and PDGFR inhibitor crenolanib is a substrate of the multidrug resistance protein ABCB1 but does not inhibit transport function at pharmacologically relevant concentrations. Invest New Drugs. 2015 Apr;33(2):300-9. [3]. Wang P, et al. Crenolanib, a PDGFR inhibitor, suppresses lung cancer cell proliferation and inhibits tumor growth in vivo. Onco Targets Ther. 2014 Sep 26;7:1761-8.