title: Src-dependent phosphorylation of membrane type I matrix metalloproteinase on cytoplasmic tyrosine 573: role in endothelial and tumor cell migration.
abstract: Membrane type 1 matrix metalloproteinase (MT1-MMP) is a transmembrane MMP that plays important roles in migratory processes underlying tumor invasion and angiogenesis. In addition to its matrix degrading activity, MT1-MMP also contains a short cytoplasmic domain whose involvement in cell locomotion seems important but remains poorly understood. In this study, we show that MT1-MMP is phosphorylated on the unique tyrosine residue located within this cytoplasmic sequence (Tyr(573)) and that this phosphorylation requires the kinase Src. Using phosphospecific antibodies recognizing MT1-MMP phosphorylated on Tyr(573), we observed that tyrosine phosphorylation of the enzyme is rapidly induced upon stimulation of tumor and endothelial cells with the platelet-derived chemoattractant sphingosine-1-phosphate, suggesting a role in migration triggered by this lysophospholipid. Accordingly, overexpression of a nonphosphorylable MT1-MMP mutant (Y573F) blocked sphingosine-1-phosphate-induced migration of Human umbilical vein endothelial cells and HT-1080 (human fibrosarcoma) cells and failed to stimulate migration of cells lacking the enzyme (bovine aortic endothelial cells). Altogether, these findings strongly suggest that the Src-dependent tyrosine phosphorylation of MT1-MMP plays a key role in cell migration and further emphasize the importance of the cytoplasmic domain of the enzyme in this process.
authors: Laboratoire de Médecine Moléculaire, Hôpital Ste-Justine-Université du Québec à Montréal, Centre de Cancérologie Charles-Bruneau, 3175 Chemin Côte-Ste-Catherine, Montréal, Québec H3T 1C5, Canada.
authors: Carine
authors: C
authors: Nyalendo
authors: Marisol
authors: M
authors: Michaud
authors: Edith
authors: E
authors: Beaulieu
authors: Christian
authors: C
authors: Roghi
authors: Gilian
authors: G
authors: Murphy
authors: Denis
authors: D
authors: Gingras
authors: Richard
authors: R
authors: Béliveau
mesh_terms: D019943:Amino Acid Substitution; D000818:Animals; D001011:Aorta / Q000201:enzymology / Q000473:pathology; D019556:COS Cells; D002417:Cattle; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects*; D002522:Chlorocebus aethiops; D042783:Endothelial Cells / Q000201:enzymology* / Q000473:pathology; D006801:Humans; D008246:Lysophospholipids / Q000378:metabolism / Q000494:pharmacology*; D053511:Matrix Metalloproteinase 14 / Q000235:genetics / Q000378:metabolism*; D020125:Mutation, Missense; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D009369:Neoplasms / Q000201:enzymology* / Q000235:genetics / Q000473:pathology; D009389:Neovascularization, Pathologic / Q000201:enzymology* / Q000235:genetics / Q000473:pathology; D010766:Phosphorylation / Q000187:drug effects; D011499:Protein Processing, Post-Translational / Q000187:drug effects / Q000235:genetics; D017434:Protein Structure, Tertiary / Q000235:genetics; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D014471:Umbilical Veins / Q000201:enzymology / Q000473:pathology; D019061:src-Family Kinases / Q000378:metabolism*
chemical_list: D008246:Lysophospholipids; D009363:Neoplasm Proteins; C060506:sphingosine 1-phosphate; D019061:src-Family Kinases; D053511:Matrix Metalloproteinase 14; D013110:Sphingosine