title: Regulation of membrane-type matrix metalloproteinase 1 activity by dynamin-mediated endocytosis.
abstract: Membrane-type matrix metalloproteinase 1 (MT1-MMP) plays a critical role in extracellular matrix remodeling under both physiological and pathological conditions. However, the mechanisms controlling its activity on the cell surface remain poorly understood. In this study, we demonstrate that MT1-MMP is regulated by endocytosis. First, we determined that Con A induces proMMP-2 activation in HT1080 cells by shifting endogenous MT1-MMP from intracellular compartments to cell surface. This phenotype was mimicked by the cytoplasmic truncation mutant MT1 Delta C with more robust pro-MMP-2 activation and cell surface expression than wild-type MT1-MMP in transfected cells. MT1 Delta C was subsequently shown to be resistant to Con A treatment whereas MT1-MMP remains competent, suggesting that Con A regulates MT1-MMP activity through cytoplasmic domain-dependent trafficking. Indeed, MT1-MMP was colocalized with clathrin on the plasma membrane and with endosomal antigen 1 in endosomes. Internalization experiments revealed that MT1-MMP is internalized rapidly in clathrin-coated vesicles whereas MT1 Delta C remains on cell surface. Coexpression of a dominant negative mutant of dynamin, K44A, resulted in elevation of MT1-MMP activity by interfering with the endocytic process. Thus, MT1-MMP is regulated by dynamin-dependent endocytosis in clathrin-coated pits through its cytoplasmic domain.
authors.affiliation: Department of Pharmacology, University of Minnesota, 6-120 Jackson Hall, 321 Church Street SE, Minneapolis, MN 55455, USA.
authors.forename: A
authors.initials: A
authors.lastname: Jiang
authors.forename: K
authors.initials: K
authors.lastname: Lehti
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: S J
authors.initials: SJ
authors.lastname: Weiss
authors.forename: J
authors.initials: J
authors.lastname: Keski-Oja
authors.forename: D
authors.initials: D
authors.lastname: Pei
mesh_terms: D000818:Animals; D001665:Binding Sites; D015415:Biomarkers; D016466:CHO Cells; D019556:COS Cells; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D002522:Chlorocebus aethiops; D003208:Concanavalin A / Q000494:pharmacology; D006224:Cricetinae; D003593:Cytoplasm / Q000378:metabolism; D004285:Dogs; D034281:Dynamins; D004705:Endocytosis / Q000502:physiology*; D004789:Enzyme Activation; D004792:Enzyme Precursors / Q000378:metabolism; D020558:GTP Phosphohydrolases / Q000378:metabolism*; D015870:Gene Expression; D006801:Humans; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D053504:Matrix Metalloproteinases, Membrane-Associated; D008565:Membrane Proteins / Q000378:metabolism; D008666:Metalloendopeptidases / Q000235:genetics / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D033921:Vesicular Transport Proteins
chemical_list: D015415:Biomarkers; D004792:Enzyme Precursors; D008565:Membrane Proteins; D033921:Vesicular Transport Proteins; C093846:early endosome antigen 1; D003208:Concanavalin A; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2; D020558:GTP Phosphohydrolases; D034281:Dynamins