title: Fibroblast growth factor-1 induced promatrilysin expression through the activation of extracellular-regulated kinases and STAT3.
abstract: The MMP, matrilysin (MMP-7), has been shown to be overexpressed in prostate cancer cells and to increase prostate cancer cell invasion. Prostate stromal fibroblasts secrete factor(s), including fibroblast growth factor-1 (FGF-1) that induces promatrilysin expression in LNCaP cells. In the present study, we investigated the signal transduction pathway involved in the FGF-1-induced expression of promatrilysin. FGF-1 treatment significantly increased the activation of extracellular signal-regulated kinases 1 and 2 (ERK1 and ERK2). This induction was time-dependent and was sustained until 24 hours after treatment. Treating the cells with MEK1/2 inhibitor (PD98059) eliminated ERK activation completely and blocked FGF-1-mediated induction of promatrilysin expression. Transient transfection studies with human matrilysin promoter resulted in a four- to five-fold increase in reporter luciferase enzyme activity that was blocked by the MEK1/2 inhibitor (PD98059). Serine phosphorylation of signal transducer and activator of transcription 3 (STAT3) was observed after FGF-1 treatment and pretreatment with 20 microM PD98059-abolished STAT3 phosphorylation. Transient transfection with dominant negative STAT3 inhibited FGF-1-induced transactivation of the matrilysin promoter indicating that STAT3 plays an important role in FGF1-induced matrilysin expression. We propose that the FGF-1-induced signaling pathway that leads to promatrilysin expression is ERK-dependent and leads to phosphorylation of Ser-727 on STAT3, phosphorylated STAT3, then binds and transactivates the matrilysin promoter. Our results demonstrate that ERK-MAP kinase and transcription factor STAT3 are important components of FGF-1-mediated signaling, which induce promatrilysin expression in LNCaP cells.
authors.affiliation: Department of Radiation Oncology, University of Arizona Health Sciences Center, Tucson 85724, USA.
authors.forename: Thirupandiyur S
authors.initials: TS
authors.lastname: Udayakumar
authors.forename: Mimi Suzanne
authors.initials: MS
authors.lastname: Stratton
authors.forename: Raymond B
authors.initials: RB
authors.lastname: Nagle
authors.forename: George Timothy
authors.initials: GT
authors.lastname: Bowden
mesh_terms: D015153:Blotting, Western; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000037:antagonists & inhibitors; D002478:Cells, Cultured; D017931:DNA Primers / Q000737:chemistry; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004792:Enzyme Precursors / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D016220:Fibroblast Growth Factor 1 / Q000494:pharmacology*; D005419:Flavonoids / Q000494:pharmacology; D006801:Humans; D008156:Luciferases / Q000378:metabolism; D008297:Male; D008666:Metalloendopeptidases / Q000378:metabolism*; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D011471:Prostatic Neoplasms / Q000201:enzymology*; D050796:STAT3 Transcription Factor; D015398:Signal Transduction; D015534:Trans-Activators / Q000378:metabolism*; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D017931:DNA Primers; D004268:DNA-Binding Proteins; D004791:Enzyme Inhibitors; D004792:Enzyme Precursors; D005419:Flavonoids; D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human; D015534:Trans-Activators; D016220:Fibroblast Growth Factor 1; D008156:Luciferases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D008666:Metalloendopeptidases; C099583:promatrilysin; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one