title: Potentiation by platelet-derived growth factor-BB of FGF-2-stimulated VEGF release in osteoblasts.
abstract: We previously reported that basic fibroblast growth factor (FGF-2) stimulates the release of vascular endothelial growth factor (VEGF) via p44/p42 mitogen-activated protein (MAP) kinase and stress-activated protein kinase/c-Jun N-terminal kinase (SAPK/JNK) in osteoblast-like MC3T3-E1 cells. In the present study, we investigated the effect of platelet-derived growth factor-BB (PDGF-BB) on FGF-2-induced VEGF release in MC3T3-E1 cells. PDGF-BB significantly enhanced the FGF-2-stimulated VEGF release. The amplifying effect of PDGF-BB was dose dependent in the range between 0.1 and 30 ng/ml. AG1295, a selective inhibitor of PDGF receptor kinase, which reduced the autophosphorylation of PDGF receptor-(R), suppressed the enhancement by PDGF-BB without affecting the FGF-2 effect. PDGF-BB failed to strengthen the FGF-2-induced phosphorylation of p44/p42 MAP kinase or SAPK/JNK. The amplification by PDGF-BB of FGF-2-stimulated VEGF release was reduced by PD98059, a specific inhibitor of MEK, or SP600125, a specific inhibitor of SAPK/JNK. These results strongly suggest that PDGF-BB potentiates FGF-2-stimulated VEGF release at a point downstream from p44/p42 MAP kinase and SAPK/JNK in osteoblasts.
authors.affiliation: Department of Clinical Laboratory, National Hospital for Geriatric Medicine, National Center for Geriatrics and Gerontology, Obu, Aichi 474-8511, Japan. tokuda@ncgg.go.jp
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Tokuda
authors.forename: Shinji
authors.initials: S
authors.lastname: Takai
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Hanai
authors.forename: Atsushi
authors.initials: A
authors.lastname: Harada
authors.forename: Rie
authors.initials: R
authors.lastname: Matsushima-Nishiwaki
authors.forename: Hisaaki
authors.initials: H
authors.lastname: Kato
authors.forename: Shinji
authors.initials: S
authors.lastname: Ogura
authors.forename: Osamu
authors.initials: O
authors.lastname: Kozawa
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000873:Anthracenes / Q000494:pharmacology; D000077214:Becaplermin; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology*; D005419:Flavonoids / Q000494:pharmacology; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D051379:Mice; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D008954:Models, Biological; D010006:Osteoblasts / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D020574:Proto-Oncogene Proteins c-sis; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000378:metabolism; D020032:Tyrphostins / Q000494:pharmacology; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis / Q000378:metabolism*
chemical_list: C407689:6,7-dimethoxy-2-phenylquinoxaline; D000873:Anthracenes; D005419:Flavonoids; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D020032:Tyrphostins; D042461:Vascular Endothelial Growth Factor A; D016222:Fibroblast Growth Factor 2; D000077214:Becaplermin; C432165:pyrazolanthrone; D020797:Receptor, Platelet-Derived Growth Factor beta; D048031:JNK Mitogen-Activated Protein Kinases; D048052:Mitogen-Activated Protein Kinase 3; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one