title: Egr-1 mediates extracellular matrix-driven transcription of membrane type 1 matrix metalloproteinase in endothelium.
abstract: Matrix metalloproteinase activity is instrumental in processes of cellular invasion. The interstitial invasion of endothelial cells during angiogenesis is accompanied by up-regulation of several matrix metalloproteinases, including membrane type 1 matrix metalloproteinase (MT1-MMP). In this study, we show that endothelial cells stimulated to undergo angiogenesis by a three-dimensional extracellular matrix environment increase production of the transcription factor Egr-1. Increased binding of Egr-1 to the MT1-MMP promoter correlates with enhanced transcriptional activity, whereas mutations in the Egr-1 binding site abrogate the increased transcription of MT1-MMP in the stimulated cells. These data identify Egr-1-mediated transcription of MT1-MMP as a mechanism by which endothelial cells can initiate an invasive phenotype in response to an alteration in extracellular matrix environment, thus functionally associating MT1-MMP with a growing number of proteins known to be up-regulated by Egr-1 in response to tissue injury or mechanical stress.
authors.affiliation: Department of Pathology, Yale University Medical School, New Haven, Connecticut 06520, USA.
authors.forename: T L
authors.initials: TL
authors.lastname: Haas
authors.forename: D
authors.initials: D
authors.lastname: Stitelman
authors.forename: S J
authors.initials: SJ
authors.lastname: Davis
authors.forename: S S
authors.initials: SS
authors.lastname: Apte
authors.forename: J A
authors.initials: JA
authors.lastname: Madri
mesh_terms: D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000378:metabolism*; D051766:Early Growth Response Protein 1; D004730:Endothelium, Vascular / Q000378:metabolism*; D005109:Extracellular Matrix / Q000378:metabolism*; D015971:Gene Expression Regulation, Enzymologic; D006207:Half-Life; D017874:Immediate-Early Proteins; D053511:Matrix Metalloproteinase 14; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases / Q000096:biosynthesis*; D051379:Mice; D008969:Molecular Sequence Data; D018919:Neovascularization, Physiologic; D011485:Protein Binding; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D016329:Sp1 Transcription Factor / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D015854:Up-Regulation
chemical_list: D004268:DNA-Binding Proteins; D051766:Early Growth Response Protein 1; C486109:Egr1 protein, mouse; C486110:Egr1 protein, rat; D017874:Immediate-Early Proteins; C507096:Mmp14 protein, mouse; D012333:RNA, Messenger; D016329:Sp1 Transcription Factor; D014157:Transcription Factors; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases; D053511:Matrix Metalloproteinase 14