WHI-P154 is a potent JAK3 inhibitor with IC50 of 1.8 μM, no activity against JAK1 or JAK2, also inhibits EGFR, Src, Abl, VEGFR and MAPK, prevents Stat3, but not Stat5 phosphorylation.
Preparation method Seeding the cells into a 96-well plate at a density of 2.5×104 cells/well and incubating for 36 h at 37 ℃ before drug exposure. On the day of treatment, culture medium is carefully aspirated from the wells and replaced with fresh medium which contains the quinazoline compounds WHI-P154 at concentrations ranging from 0.1 μM to 250 μM. Using triplicate wells for each treatment. Incubating the cells with the compound for 24 hours to 36 hours at 37 ℃ in a humidified 5% CO2 atmosphere.10 μL of MTT (final concentration for each well, 0.5 mg/mL) is added, and the plate are incubated at 37 ℃ for 4 h. Than solubilized overnight at 37 ℃ in a solution containing 10% SDS in 0.01 M HCL. Mearsuring the absorbance of each well in a microplate reader at 570 nm.