PHA-848125 is an ATP-competitive inhibitor of cyclin-dependent kinases (Cdks) that potently inhibits Cdk2/cyclin A (IC50 = 45 nM). It is at least 3-fold less potent at Cdks 1, 3, 4, 5, and 7. PHA-848125 is orally available and displays efficacy in suppressing the growth of cancer cells or tumor xenografts in animals.
This cyclin kinase-directed inhibitor (FW = 460.57 g/mol; CAS 802539-81- 7, 802540-32-5 (3HCl), 1253645-38-3 (Maleic acid); Solubility: 90 mg/mL DMSO; <1 mg/mL Water), systematically named N,1,4,4-tetramethyl-8-(4- (4-methylpiperazin-1-yl)phenylamino)-4,5-dihydro-1H-pyrazolo[4,3-h] quinazoline-3-carboxamide, targets cyclin A/CDK2 inhibitor with IC50 of 45 nM. PHA-848125-treated cells show cell cycle arrest in G1 and reduced DNA synthesis, accompanied by inhibition of pRb phosphorylation and modulation of other CDK-dependent markers. Cyclin Target Selectivity: Cdk1 (weak, if any), Cdk2 (++), Cdk3 (weak, if any), Cdk4 (weak, if any), Cdk5 (weak, if any), Cdk6 (weak, if any), Cdk7 (weak, if any), Cdk8 (weak, if any), Cdk9 (weak, if any), Cdk10 (weak, if any)
1. brasca mg, amboldi n, ballinari d et al. identification of n,1,4,4-tetramethyl-8-{[4-(4-methylpiperazin-1-yl)phenyl]amino}-4,5-dihydro-1h-pyrazolo[4,3-h]quinazoline-3-carboxamide (pha-848125), a potent, orally available cyclin dependent kinase inhibitor. j med chem. 2009 aug 27;52(16):5152-63.
