title: Inhibition of FGF-1 receptor tyrosine kinase activity by PD 161570, a new protein-tyrosine kinase inhibitor.
abstract: Through direct synthetic efforts we discovered a small molecule which is a 40 nanomolar inhibitor of the human FGF-1 receptor tyrosine kinase. 1-Tert-butyl-3-[6-(2,6-dichloro-phenyl)-2-(4-diethylamino-butylamino)-py rido[2,3-d]pyrimidin-7-yl]-urea (PD 161570) had about 5- and 100-fold greater selectivity toward the FGF-1 receptor (IC50 = 40 nM) compared with the PDGFbeta receptor (IC50 = 262 nM) or EGF receptor (IC50 = 3.7 microM) tyrosine kinases, respectively. In addition, PD 161570 suppressed constitutive phosphorylation of the FGF-1 receptor in both human ovarian carcinoma cells (A121(p)) and Sf9 insect cells overexpressing the human FGF-1 receptor and blocked the growth of A121(p) cells in culture. The results demonstrate a novel synthetic inhibitor with nanomolar potency and specificity towards the FGF-1 receptor tyrosine kinase.
authors.affiliation: Department of Therapeutics, Parke-Davis Pharmaceutical Research Division of Warner-Lambert Company, Ann Arbor, MI 48105, USA.
authors.forename: B L
authors.initials: BL
authors.lastname: Batley
authors.forename: A M
authors.initials: AM
authors.lastname: Doherty
authors.forename: J M
authors.initials: JM
authors.lastname: Hamby
authors.forename: G H
authors.initials: GH
authors.lastname: Lu
authors.forename: P
authors.initials: P
authors.lastname: Keller
authors.forename: T K
authors.initials: TK
authors.lastname: Dahring
authors.forename: O
authors.initials: O
authors.lastname: Hwang
authors.forename: K
authors.initials: K
authors.lastname: Crickard
authors.forename: R L
authors.initials: RL
authors.lastname: Panek
mesh_terms: D000818:Animals; D002455:Cell Division / Q000502:physiology; D002460:Cell Line; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005346:Fibroblast Growth Factors / Q000502:physiology; D006801:Humans; D010766:Phosphorylation; D011743:Pyrimidines / Q000494:pharmacology*; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors*; D051496:Receptor, Fibroblast Growth Factor, Type 1; D017468:Receptors, Fibroblast Growth Factor / Q000037:antagonists & inhibitors* / Q000378:metabolism; D011994:Recombinant Proteins / Q000378:metabolism; D018411:Spodoptera; D014407:Tumor Cells, Cultured; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D004791:Enzyme Inhibitors; C107527:PD 161570; D011743:Pyrimidines; D017468:Receptors, Fibroblast Growth Factor; D011994:Recombinant Proteins; D005346:Fibroblast Growth Factors; D014508:Urea; C496348:FGFR1 protein, human; D020794:Receptor Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1