Information
In vitro
PD0325901 shows higher permeability than CI-1040, another MEK inhibitor. PD0325901 should be able to achieve higher systemic exposures than CI-1040. PD0325901 is exquisitely specific and highly potent against purified MEK, revealing a Kiapp of 1 nM against activated MEK1 and MEK2. PD0325901 is roughly 500-fold more potent than CI-1040 with respect to its cellular effects on phosphorylation of ERK1 and ERK2, displaying subnanomolar activity. PD0325901 prevents the growth of melanoma cell lines. PD0325901 inhibits the growth of TPC-1 cells and K2 cells with GI50 of 11 nM and 6.3 nM, respectively. PD0325901 significantly prevents the the growth of PTC cells harboring a BRAF mutation at very low concentration (10 nM) and only moderately increases the growth of the PTC cells carrying the RET/PTC1 rearrangement at the same concentration. PD0325901 effectively inhibits the phosphorylation of ERK1/2 in multiple PTC cell lines.
In vivo
The improved potency of PD0325901 relative to CI-1040 is evident. A single oral dose of PD0325901 (25 mg/kg) inhibits phosphorylation of ERK by more than 50% at 24 hours post-dosing. In contrast, CI-1040 at a much higher dose (150 mg/kg) only inhibit pERK levels for roughly 8 hours, returning to control levels by 24 hours after treatment. Therefore, the dose required to produce a 70% incidence of complete tumor responses (C26 model) is 25 mg/kg/day versus 900 mg/kg/day for PD0325901 and CI-1040, respectively. Anticancer activity of PD 0325901 has been demonstrated for a broad spectrum of human tumor xenografts. After 1 week of oral administration of PD0325901 (20–25 mg/kg/day) in mice, no tumor growth is detected in mice inoculated with PTC cells bearing a BRAF mutation. For PTC with the RET/PTC1 rearrangement, the average tumor volume of the orthotopic tumor is decreased by 58% as compared with controls. In conclusion, PTC cells carrying a BRAF mutation are more sensitive to PD0325901 than are PTC cells carrying the RET/PTC1 rearrangement.
Cell Data
cell lines：BT474, SKBR-3, SKOV-3, MDA-468, MCF-7 and H1650 cancer cells
Concentrations：0.1 nM- 1 μM
Incubation Time：48 hours
Powder Purity:≥99%
