title: Upregulated expression of fibroblast growth factor (FGF) receptors by transforming growth factor-beta1 (TGF-beta1) mediates enhanced mitogenic responses to FGFs in cultured human lung fibroblasts.
abstract: Transforming growth factor-beta1 (TGF-beta1) is a multifunctional cytokine that induces mesenchymal cell proliferation in vivo while inhibiting growth of most cells directly via serine-threonine receptor(s) binding/activation in vitro. In this study, the ability of TGF-beta1 to regulate the receptor expression of classical mitogenic growth factors that bind receptor tyrosine kinases was examined. TGF-beta1 markedly increased the protein expression of the fibroblast growth factor (FGF) receptors FGFR-1 (Flg) and FGFR-2 (Bek) in a time- and dose-dependent manner in human lung fibroblasts. This resulted in a potentiation of the mitogenic response of multiple FGF ligands that bind to these receptors. TGF-beta1 had no effect on epidermal growth factor (EGF) or platelet-derived growth factor (PDGF)-beta receptor expression and the mitogenic responses mediated by specific ligands for these receptors were not increased. These results demonstrate a novel action of TGF-beta1 to selectively upregulate the expression of FGF receptor family members leading to enhanced mitogenesis by FGFs.
authors.affiliation: Department of Medicine, New England Medical Center/Tupper Research Institute/Tufts University, School of Medicine, Boston, Massachusetts, 02111, USA. victor.thannickal@es.nemc.org
authors.forename: V J
authors.initials: VJ
authors.lastname: Thannickal
authors.forename: K D
authors.initials: KD
authors.lastname: Aldweib
authors.forename: T
authors.initials: T
authors.lastname: Rajan
authors.forename: B L
authors.initials: BL
authors.lastname: Fanburg
mesh_terms: D000818:Animals; D000077214:Becaplermin; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D016220:Fibroblast Growth Factor 1; D051526:Fibroblast Growth Factor 10; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology; D051523:Fibroblast Growth Factor 7; D005346:Fibroblast Growth Factors / Q000494:pharmacology* / Q000502:physiology; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D000091344:Filaggrin Proteins; D006133:Growth Substances / Q000494:pharmacology; D006801:Humans; D007700:Kinetics; D008168:Lung / Q000166:cytology; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D020574:Proto-Oncogene Proteins c-sis; D020794:Receptor Protein-Tyrosine Kinases / Q000096:biosynthesis* / Q000235:genetics; D051496:Receptor, Fibroblast Growth Factor, Type 1; D051497:Receptor, Fibroblast Growth Factor, Type 2; D017468:Receptors, Fibroblast Growth Factor / Q000096:biosynthesis* / Q000235:genetics; D011994:Recombinant Proteins / Q000494:pharmacology; D013552:Swine; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D015854:Up-Regulation / Q000187:drug effects
chemical_list: C496453:FGF7 protein, human; C000717249:FLG protein, human; D051526:Fibroblast Growth Factor 10; D000091344:Filaggrin Proteins; D006133:Growth Substances; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D017468:Receptors, Fibroblast Growth Factor; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; D016222:Fibroblast Growth Factor 2; D016220:Fibroblast Growth Factor 1; D051523:Fibroblast Growth Factor 7; D000077214:Becaplermin; D005346:Fibroblast Growth Factors; C496348:FGFR1 protein, human; C496353:FGFR2 protein, human; D020794:Receptor Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1; D051497:Receptor, Fibroblast Growth Factor, Type 2