title: Collagen-induced proMMP-2 activation by MT1-MMP in human dermal fibroblasts and the possible role of alpha2beta1 integrins.
abstract: Culture of human dermal fibroblasts within a three-dimensional matrix composed of native type I collagen fibrils is widely used to study the cellular responses to the extracellular matrix. Upon contact with native type I collagen fibrils human skin fibroblasts activate latent 72-kDa type IV collagenase/ gelatinase (MMP-2) to its active 59- and 62-kDa forms. This activation did not occur when cells were cultured on plastic dishes coated with monomeric type I collagen or its denatured form, gelatin. Activation could be inhibited by antibodies against MT1-MMP, by the addition of TIMP-2 and by prevention of MT1-MMP processing. MT1-MMP protein was detected at low levels as active protein in fibroblasts cultured as monolayers. In collagen gel cultures, an increase of the active, 60-kDa MT1-MMP and an additional 63-kDa protein corresponding to inactive MT1-MMP was detected. Incubation of medium containing latent MMP-2 with cell membranes isolated from fibroblasts grown in collagen gels caused activation of the enzyme. Furthermore, regulation of MT1-MMP expression in collagen cultures seems to be mediated by alpha2beta1 integrins. These studies suggest that activation of the proMMP-2 is regulated at the cell surface by a mechanism which is sensitive to cell culture in contact with physiologically relevant matrices and which depends on the ratio of proenzyme and the specific inhibitor TIMP-2.
authors.affiliation: Department of Dermatology, University of Cologne, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Zigrino
authors.forename: C
authors.initials: C
authors.lastname: Drescher
authors.forename: C
authors.initials: C
authors.lastname: Mauch
mesh_terms: D018929:Cell Culture Techniques / Q000379:methods; D002462:Cell Membrane / Q000378:metabolism; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism*; D004789:Enzyme Activation; D004790:Enzyme Induction; D004792:Enzyme Precursors / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D016023:Integrins / Q000378:metabolism*; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism*; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases / Q000096:biosynthesis* / Q000235:genetics; D011499:Protein Processing, Post-Translational; D038981:Receptors, Collagen; D012867:Skin / Q000166:cytology; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000378:metabolism; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000378:metabolism
chemical_list: D004792:Enzyme Precursors; D016023:Integrins; D038981:Receptors, Collagen; D019715:Tissue Inhibitor of Metalloproteinase-1; D019716:Tissue Inhibitor of Metalloproteinase-2; D003094:Collagen; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2