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Inhibition of Receptor-Dependent Urokinase Signaling by Specific Ser to Glu Substitutions
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Maria Vincenza Carriero
Published/Copyright:
June 1, 2005
Abstract
We have previously reported that phosphorylation of human urokinase on Ser138/303 abolishes its catalyticindependent motogen and proadhesive abilities, whereas receptor binding is not affected. Here we show that substitution of the two relevant serines with glutamic acid residues impairs the ability of urokinase to mobilize a variety of human and mouse cell lines as well as human primary T lymphocytes. Accordingly, urokinase receptordependent signaling, leading to cytoskeletal rearrangements and paxillin redistribution, does not occur in MCF-7 breast carcinoma cells exposed to phosphorylationlike urokinase. Unlike the wildtype form, disubstituted urokinase is unable to induce the physical association of urokinase receptor with αvβ5 vitronectin receptor, which is required for MCF-7 urokinasedependent cell migration. Finally, the disubstituted variant fails to activate p55fgr, a member of the Src tyrosine kinase family, which mediates cell migration and adhesion of U937 myelomonocytic cells. In conclusion, the finding that specific amino acid substitutions strongly interfere with the ability of urokinase to stimulate cell migration, and the associated intracellular events uncover a novel way to regulate urokinase receptordependent signaling.
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Published Online: 2005-06-01
Published in Print: 2002-01-23
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Non-Enzymatic Activities of Proteases: From Scepticism to Reality
- The Urokinase Plasminogen Activator Receptor in the Regulation of the Actin Cytoskeleton and Cell Motility
- The Molecular Basis for Anti-Proteolytic and Non-Proteolytic Functions of Plasminogen Activator Inhibitor Type-1: Roles of the Reactive Centre Loop, the Shutter Region, the Flexible Joint Region and the Small Serpin Fragment
- Nervous System Pathology: The Fibrin Perspective
- Post-Transcriptional Regulation of Gene Expression in the Plasminogen Activation System
- Role of Myofibroblasts at the Invasion Front
- Transmodulation of Cell Surface Regulatory Molecules via Ectodomain Shedding
- The Plasminogen Activating System in Periodontal Health and Disease
- Apolipoprotein(a): Structure-Function Relationship at the Lysine-Binding Site and Plasminogen Activator Cleavage Site
- Anti-Invasive Effects of Green Tea Polyphenol EpiGalloCatechin-3-Gallate (EGCG), a Natural Inhibitor of Metallo and Serine Proteases
- Inhibition of Receptor-Dependent Urokinase Signaling by Specific Ser to Glu Substitutions
- Activation of p38 MAP-Kinase and Caldesmon Phosphorylation Are Essential for Urokinase-Induced Human Smooth Muscle Cell Migration
- Growth Factor-Dependent Proliferation and Invasion of Muscle Satellite Cells Require the Cell-Associated Fibrinolytic System
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- uPA-Silica-Particles (SP-uPA): A Novel Analytical System to Investigate uPA-uPAR Interaction and to Test Synthetic uPAR Antagonists as Potential Cancer Therapeutics
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