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This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Degryse, B. Articles by Blasi, F. Search for Related Content PubMed PubMed Citation Articles by Degryse, B. Articles by Blasi, F. Related Collections Hemostasis, Thrombosis, and Vascular Biology Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, Vol. 94 No. 2 (July 15), 1999: pp. 649-662 Src-Dependence and Pertussis-Toxin Sensitivity of Urokinase Receptor-Dependent Chemotaxis and Cytoskeleton Reorganization in Rat Smooth Muscle Cells Bernard Degryse, Massimo Resnati, Shafaat A. Rabbani, Antonello Villa, Francesca Fazioli, and Francesco Blasi From DIBIT, Università Vita-Salute San Raffaele, Milano, Italy; McGill University and Royal Victoria Hospital, Montreal, Quebec, Canada; and the Dipartimento di Farmacologia, CNR and B. Ceccarelli Centers, University of Milan. The catalytically inactive precursor of urokinase-type plasminogen activator (pro-u-PA) induced a chemotactic response in rat smooth muscle cells (RSMC) through binding to the membrane receptor of urokinase (u-PA receptor [u-PAR]). A soluble form of u-PAR activated by chymotrypsin cleavage as well as a peptide located between domain 1 and 2 of u-PAR reproduced the effect of pro-u-PA on cell migration. The chemotactic pro-u-PA effect correlates with a dramatic reorganization of actin cytoskeleton, of adhesion plaques, and with major cell shape changes in RSMC. Pro-u-PA induced a decrease in stress fiber content, membrane ruffling, actin ring formation, and disruption leading to the characteristic elongated cell shape of motile cells with an actin semi-ring located close to the leading edge of cells. u-PAR effects on both chemotaxis and cytoskeleton were sensitive to pertussis toxin and, hence, possibly require G proteins. u-PAR effects are accompanied by a relocation of u-PAR, vitronectin receptor (VNR) v3, 1 integrin subunit, and Src tyrosine kinase to the leading membrane of migrating cells. In conclusion, our data show that pro-u-PA, via binding to u-PAR, controls a signaling pathway, regulated by tyrosine kinases and possibly G proteins, leading to cell cytoskeleton reorganization and cell migration. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: A. P. Lillis, L. B. Van Duyn, J. E. Murphy-Ullrich, and D. K. 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