title: Inhibition of collagenase-3 (MMP-13) expression in transformed human keratinocytes by interferon-gamma is associated with activation of extracellular signal-regulated kinase-1,2 and STAT1.
abstract: Collagenase-3 (MMP-13) is characterized by an exceptionally wide substrate specificity and restricted expression. MMP-13 is specifically expressed by transformed human keratinocytes in squamous cell carcinomas in vivo and its expression correlates with their invasion capacity. Here, we show, that interferon-gamma (IFN-gamma) markedly inhibits expression of MMP-13 by human cutaneous SCC cells (UT-SCC-7) and by ras-transformed human epidermal keratinocytes (A-5 cells) at the transcriptional level. In addition, IFN-gamma inhibits collagenase-1 (MMP-1) expression in these cells. IFN-gamma abolished the enhancement of MMP-13 and MMP-1 expression by transforming growth factor-beta (TGF-beta) and tumor necrosis factor-alpha (TNF-alpha), and inhibited invasion of A-5 cells through type I collagen. IFN-gamma also rapidly and transiently activates extracellular signal-regulated kinase 1,2 (ERK1,2) and blocking ERK1,2 pathway (Raf/MEK1,2/ERK1,2) by specific MEK1,2 inhibitor PD98059 partially (by 50%) prevents Ser-727 phosphorylation of STAT1 and suppression of MMP-13 expression by IFN-gamma. Furthermore, Ser-727 phosphorylation of STAT1 by ERK1,2, or independently of ERK1,2 activation is associated with marked reduction in MMP-13 expression. These observations identify a novel role for IFN-gamma as a potent inhibitor of collagenolytic activity and invasion of transformed squamous epithelial cells, and show that inhibition of MMP-13 expression by IFN-gamma involves activation of ERK1,2 and STAT1.
authors.affiliation: MediCity Research Laboratory, Department of Medical Biochemistry, University of Turku, FIN-20520 Turku, Finland.
authors.forename: R
authors.initials: R
authors.lastname: Ala-aho
authors.forename: N
authors.initials: N
authors.lastname: Johansson
authors.forename: R
authors.initials: R
authors.lastname: Grénman
authors.forename: N E
authors.initials: NE
authors.lastname: Fusenig
authors.forename: C
authors.initials: C
authors.lastname: López-Otín
authors.forename: V M
authors.initials: VM
authors.lastname: Kähäri
mesh_terms: D002461:Cell Line, Transformed; D002470:Cell Survival / Q000187:drug effects; D002471:Cell Transformation, Neoplastic / Q000187:drug effects* / Q000378:metabolism*; D017364:Collagenases / Q000096:biosynthesis* / Q000235:genetics; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D015603:Keratinocytes / Q000187:drug effects / Q000201:enzymology* / Q000378:metabolism; D053509:Matrix Metalloproteinase 13; D061965:Matrix Metalloproteinase Inhibitors; D020782:Matrix Metalloproteinases / Q000096:biosynthesis* / Q000235:genetics; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009928:Organ Specificity / Q000235:genetics; D011994:Recombinant Proteins; D050794:STAT1 Transcription Factor; D015534:Trans-Activators / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects / Q000235:genetics; D016212:Transforming Growth Factor beta / Q000037:antagonists & inhibitors; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors
chemical_list: D004268:DNA-Binding Proteins; D004791:Enzyme Inhibitors; D061965:Matrix Metalloproteinase Inhibitors; D011994:Recombinant Proteins; D050794:STAT1 Transcription Factor; C494079:STAT1 protein, human; D015534:Trans-Activators; D016212:Transforming Growth Factor beta; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D017364:Collagenases; C507079:MMP13 protein, human; D053509:Matrix Metalloproteinase 13; D020782:Matrix Metalloproteinases