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J. Biol. Chem., Vol. 282, Issue 21, 15690-15699, May 25, 2007
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From the
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 and
Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Robinson Way, Cambridge CB2 0RE, United Kingdom
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 (Tyr573) and that this phosphorylation requires the kinase Src. Using phosphospecific antibodies recognizing MT1-MMP phosphorylated on Tyr573, 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.
Received for publication, August 22, 2006 , and in revised form, March 27, 2007.
* This work was supported by a grant from the Canadian Institutes for Health Research (to R. B. and D. G.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
1 Supported by Cancer Research UK.
2 To whom correspondence should be addressed: Laboratoire de Médecine Moléculaire Ste-Justine-UQAM, Centre de Cancérologie Charles-Bruneau, 3175, Chemin Côte-Ste-Catherine, Montréal, Québec PQ H3T 1C5, Canada. Tel.: 514-345-2366; Fax: 514-345-2359; E-mail: molmed{at}recherche-ste-justine.qc.ca.
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