CHIR-124 is a potent and selective Chk1 inhibitor with IC50 of 0.3 nM, and also potently targets PDGFR and FLT3 with IC50s of 6.6 nM and 5.8 nM.
IC50&Target
Chk1
0.3 nM (IC50)
PDGFR
6.6 nM (IC50)
Chk2
697.4 nM (IC50)
FLT3
5.8 nM (IC50)
Cdk4/cyclin D
2.05 μM (IC50)
CDC2/cyclin B
0.5057 μM (IC50)
Cdk2/cyclin A
0.1911 μM (IC50)
bFGFR
2.01 μM (IC50)
FGFR3
1.29 μM (IC50)
VEGFR2 FLK1
0.5779 μM (IC50)
VEGFR1 FLT1
0.4636 μM (IC50)
PKCα
0.58 μM (IC50)
PKAβ I
2.25 μM (IC50)
PKCβ II
0.58 μM (IC50)
PKCγ
0.11 μM (IC50)
ERK2
4.31 μM (IC50)
PKA
0.1031 μM (IC50)
GSK3
0.0233 μM (IC50)
体外研究
CHIR-124 is 500- to 5,000-fold less active against other cell cycle kinases, such as cyclin-dependent kinase 2/cyclin A (0.19 μM), cdc2/cyclin B (0.51 μM), and cyclin-dependent kinase 4/cyclin D (2.1 μM). CHIR-124 (≥0.9 nM) in combination with SN-38 (≥0.42 nM) causes significant synergy or >10% deviation from additivity in human cancer cell lines expressing mutant p53, and these values overlap and fall below the IC50s for SN-38 (1.2×10 M) and CHIR-124 (2.2×10 M), respectively. Moreover, CHIR-124 (100 nM) abrogates the SN-38-induced S and G2-M phase cell cycle checkpoints. CHIR-124 (200 nM) leads to a 2.5-fold elevated level of cdc25A above that of the untreated HCT116 p53 cells. The down-regulation of cdc25A induced by SN-38 is completely restored by concurrent or sequential treatment with CHIR-124, proving that CHIR-124 inhibits the Chk1-mediated destruction of cdc25A in whole cells. CHIR-124 occupies the ATP-binding site, inhibits Chk1 (IC50, 0.3 nM) 2,000-fold more potently than Chk2 (IC50, 0.7 μM).
体内研究
CHIR-124 (10 or 20 mg/kg, p.o.) does not have a significant effect on tumor growth when compared with the vehicle-treated group, but it potentiates the growth inhibitory effect of CPT-11 in a human breast carcinoma xenograft model. The potentiation of the tumor growth inhibitory effect of CPT-11 by CHIR-124 is associated with an increase in apoptosis induction in the tumors. CHIR-124 reverses the suppression of phospho-H3 staining induced by CPT-11, indicating abrogation of the G2-M checkpoint by CHIR-124.
分子式
C23H22N5OCl
分子量
419.91
CAS号
405168-58-3
运输条件
Room temperature in continental US; may vary elsewhere.