title: Selective inhibition of platelet-derived growth factor (PDGF) receptor autophosphorylation and PDGF-mediated cellular events by a quinoline derivative.
abstract: This report describes the biological effects of our original compound, Ki6783 ((3,4-dimethoxy)-4-phenoxy-6,7-dimethoxyquinoline), a potent and selective inhibitor of platelet-derived growth factor (PDGF) receptor autophosphorylation. This compound strongly inhibited autophosphorylation of the PDGF beta-receptor in cultured rat glomerular mesangial cells (MC) bearing this receptor (IC50 0.1 microM), although it did not inhibit autophosphorylation of other growth factor receptors even at 100 microM. In a cell-free kinase experiment, it showed selective inhibition of PDGF beta-receptor tyrosine kinase. A kinetic study of the compound to this tyrosine kinase revealed a competitive mode of action to ATP. [3H]Thymidine incorporation and cell proliferation of MC were inhibited by Ki6783 in a dose-dependent manner after Ki6783 and PDGF-BB were added to the culture medium. Furthermore, this compound normalized the fibrotic cell shape of v-sis-transformed NIH3T3 cells, which grow in an autocrine manner via the PDGF receptor. These effects could be explained by the inhibition of intracellular signal transduction triggered by PDGF receptor autophosphorylation, in which activation of mitogen-activated protein kinase occurs. These results suggest that Ki6783 is one of the more potent and selective inhibitors of PDGF receptor autophosphorylation and that it may be useful in ameliorating cell abnormalities due to excess action of PDGF and its receptor systems in several diseases.
authors.affiliation: Pharmaceutical Research Laboratory, Kirin Brewery Company, Ltd., Takasaki-shi, Japan. m-yagi@kirin.co.jp
authors.forename: M
authors.initials: M
authors.lastname: Yagi
authors.forename: S
authors.initials: S
authors.lastname: Kato
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: K
authors.initials: K
authors.lastname: Kubo
authors.forename: S
authors.initials: S
authors.lastname: Oyama
authors.forename: T
authors.initials: T
authors.lastname: Shimizu
authors.forename: T
authors.initials: T
authors.lastname: Nishitoba
authors.forename: T
authors.initials: T
authors.lastname: Isoe
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.forename: H
authors.initials: H
authors.lastname: Ohashi
authors.forename: N
authors.initials: N
authors.lastname: Kobayashi
authors.forename: N
authors.initials: N
authors.lastname: Iinuma
authors.forename: T
authors.initials: T
authors.lastname: Osawa
authors.forename: R
authors.initials: R
authors.lastname: Onose
authors.forename: H
authors.initials: H
authors.lastname: Osada
mesh_terms: D016475:3T3 Cells; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000077214:Becaplermin; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism; D002455:Cell Division; D002461:Cell Line, Transformed; D048429:Cell Size; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis; D004789:Enzyme Activation; D004791:Enzyme Inhibitors; D005920:Glomerular Mesangium / Q000166:cytology*; D006801:Humans; D007700:Kinetics; D008297:Male; D051379:Mice; D010766:Phosphorylation / Q000187:drug effects; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D020574:Proto-Oncogene Proteins c-sis; D011804:Quinolines / Q000494:pharmacology*; D051381:Rats; D011921:Rats, Inbred WKY; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors*; D020797:Receptor, Platelet-Derived Growth Factor beta; D017479:Receptors, Platelet-Derived Growth Factor / Q000378:metabolism*; D015398:Signal Transduction
chemical_list: D004791:Enzyme Inhibitors; C107600:Ki 6783; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D011804:Quinolines; D000077214:Becaplermin; D000255:Adenosine Triphosphate; D004247:DNA; C099852:PDGF receptor tyrosine kinase; D020794:Receptor Protein-Tyrosine Kinases; D020797:Receptor, Platelet-Derived Growth Factor beta; D017479:Receptors, Platelet-Derived Growth Factor; D017871:Calcium-Calmodulin-Dependent Protein Kinases