title: MT1-MMP expression promotes tumor growth and angiogenesis through an up-regulation of vascular endothelial growth factor expression.
abstract: Membrane type 1 metalloprotease (MT1-MMP) is a transmembrane metalloprotease that plays a major role in the extracellular matrix remodeling, directly by degrading several of its components and indirectly by activating pro-MMP2. We investigated the effects of MT1-MMP overexpression on in vitro and in vivo properties of human breast adenocarcinoma MCF7 cells, which do not express MT1-MMP or MMP-2. MT1-MMP and MMP-2 cDNAs were either transfected alone or cotransfected. All clones overexpressing MT1-MMP 1) were able to activate endogenous or exogenous pro-MMP-2, 2) displayed an enhanced in vitro invasiveness through matrigel-coated filters independent of MMP-2 transfection, 3) induced the rapid development of highly vascularized tumors when injected subcutaneously in nude mice, and 4) promoted blood vessels sprouting in the rat aortic ring assay. These effects were observed in all clones overexpressing MT1-MMP regardless of MMP-2 expression levels, suggesting that the production of MMP-2 by tumor cells themselves does not play a critical role in these events. The angiogenic phenotype of MT1-MMP-producing cells was associated with an up-regulation of VEGF expression. These results emphasize the importance of MT1-MMP during tumor angiogenesis and open new opportunities for the development of anti-angiogenic strategies combining inhibitors of MT1-MMP and VEGF antagonists.
authors.affiliation: Laboratory of Tumor and Development Biology, Laboratory of Connective Tissues Biology, University of Liège, Sart Tilman, B-4000 Liège, Belgium.
authors.forename: N E
authors.initials: NE
authors.lastname: Sounni
authors.forename: L
authors.initials: L
authors.lastname: Devy
authors.forename: A
authors.initials: A
authors.lastname: Hajitou
authors.forename: F
authors.initials: F
authors.lastname: Frankenne
authors.forename: C
authors.initials: C
authors.lastname: Munaut
authors.forename: C
authors.initials: C
authors.lastname: Gilles
authors.forename: C
authors.initials: C
authors.lastname: Deroanne
authors.forename: E W
authors.initials: EW
authors.lastname: Thompson
authors.forename: J M
authors.initials: JM
authors.lastname: Foidart
authors.forename: A
authors.initials: A
authors.lastname: Noel
mesh_terms: D000818:Animals; D001011:Aorta / Q000502:physiology; D002455:Cell Division; D002465:Cell Movement; D002999:Clone Cells; D046508:Culture Techniques; D016228:Endothelial Growth Factors / Q000096:biosynthesis* / Q000235:genetics; D005260:Female; D006801:Humans; D008222:Lymphokines / Q000096:biosynthesis* / Q000235:genetics; D008325:Mammary Neoplasms, Experimental / Q000098:blood supply / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D053511:Matrix Metalloproteinase 14; D020778:Matrix Metalloproteinase 2 / Q000096:biosynthesis / Q000235:genetics; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009389:Neovascularization, Pathologic / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D015533:Transcriptional Activation; D014162:Transfection; D014407:Tumor Cells, Cultured; D015854:Up-Regulation; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors
chemical_list: D016228:Endothelial Growth Factors; D008222:Lymphokines; C507096:Mmp14 protein, mouse; D012333:RNA, Messenger; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2; D053511:Matrix Metalloproteinase 14