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Volume 271, Number 46, Issue of November 15, 1996 pp. 29393-29399
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

Requirement of Receptor-bound Urokinase-type Plasminogen Activator for Integrin alpha vbeta 5-directed Cell Migration

(Received for publication, April 27, 1996, and in revised form, August 30, 1996)

Mayra Yebra Dagger , Graham C. N. Parry Dagger , Staffan Strömblad , Nigel Mackman , Steven Rosenberg , Barbara M. Mueller and David A. Cheresh

From Dagger  The Scripps Research Institute, Departments of Immunology and Vascular Biology, IMM24, La Jolla, California 92037 and  Chiron Corporation, Emeryville, California 94608

The urokinase plasminogen activator (uPA) interacts with its cell surface receptor (uPAR), providing an inducible, localized cell surface proteolytic activity, thereby promoting cellular invasion. Evidence is provided for a novel function of cell surface-associated uPA·uPAR. Specifically, induction of cell surface expression of uPA·uPAR by growth factors or phorbol ester was necessary for vitronectin-dependent carcinoma cell migration, an event mediated by integrin alpha vbeta 5. Cell migration on vitronectin was blocked with either a soluble form of uPAR, an antibody that disrupts uPA binding to uPAR, or a monoclonal antibody to alpha vbeta 5. Moreover, plasminogen activator inhibitor type 2 blocked this migration event but did not affect adhesion, suggesting a direct role for uPA enzyme activity in this process and that migration but not adhesion of these cells is regulated by uPA·uPAR. Growth factor-mediated induction of uPA·uPAR on the carcinoma cell surface promotes a specific motility event mediated by integrin alpha vbeta 5, since cells transfected with the beta 3 integrin subunit expressed alpha vbeta 3 and migrated on vitronectin independently of growth factors or uPA·uPAR expression. This relationship between alpha vbeta 5 and the uPA·uPAR system has significant implications for regulation of motility events associated with development, angiogenesis, and tumor metastasis.


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