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      uPAR promotes formation of the p130Cas–Crk complex to activate Rac through DOCK180

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          Abstract

          The urokinase-type plasminogen activator receptor (uPAR) drives tumor cell membrane protrusion and motility through activation of Rac; however, the pathway leading from uPAR to Rac activation has not been described. In this study we identify DOCK180 as the guanine nucleotide exchange factor acting downstream of uPAR. We show that uPAR cooperates with integrin complexes containing β 3 integrin to drive formation of the p130Cas–CrkII signaling complex and activation of Rac, resulting in a Rac-driven elongated-mesenchymal morphology, cell motility, and invasion. Our findings identify a signaling pathway underlying the morphological changes and increased cell motility associated with uPAR expression.

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          Cellular motility driven by assembly and disassembly of actin filaments.

          Thomas D Pollard, Gary G Borisy (2003)
          Motile cells extend a leading edge by assembling a branched network of actin filaments that produces physical force as the polymers grow beneath the plasma membrane. A core set of proteins including actin, Arp2/3 complex, profilin, capping protein, and ADF/cofilin can reconstitute the process in vitro, and mathematical models of the constituent reactions predict the rate of motion. Signaling pathways converging on WASp/Scar proteins regulate the activity of Arp2/3 complex, which mediates the initiation of new filaments as branches on preexisting filaments. After a brief spurt of growth, capping protein terminates the elongation of the filaments. After filaments have aged by hydrolysis of their bound ATP and dissociation of the gamma phosphate, ADF/cofilin proteins promote debranching and depolymerization. Profilin catalyzes the exchange of ADP for ATP, refilling the pool of ATP-actin monomers bound to profilin, ready for elongation.
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            Models, mechanisms and clinical evidence for cancer dormancy.

            Julio Aguirre-Ghiso (2007)
            Patients with cancer can develop recurrent metastatic disease with latency periods that range from years even to decades. This pause can be explained by cancer dormancy, a stage in cancer progression in which residual disease is present but remains asymptomatic. Cancer dormancy is poorly understood, resulting in major shortcomings in our understanding of the full complexity of the disease. Here, I review experimental and clinical evidence that supports the existence of various mechanisms of cancer dormancy including angiogenic dormancy, cellular dormancy (G0-G1 arrest) and immunosurveillance. The advances in this field provide an emerging picture of how cancer dormancy can ensue and how it could be therapeutically targeted.
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              Cdc42--the centre of polarity.

              Sandrine Etienne-Manneville (2004)
              All cell types polarize, at least transiently, during division or to generate specialized shapes and functions. This capacity extends from yeast to mammals, and it is now clear that many features of the molecular mechanisms controlling polarization are conserved in all eukaryotic cells. At the centre of the action is Cdc42, a small GTPase of the Rho family. Its activity is precisely controlled both temporally and spatially, and this can be achieved by a wide variety of extracellular cues in multicellular organisms. Moreover, although the functional characteristics of cell polarity are extremely variable (depending on the cell type and the biological context), Cdc42 has an amazing capacity to co-ordinate the control of multiple signal transduction pathways.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Cell Biol
                Journal ID (publisher-id): jcb
                Title: The Journal of Cell Biology
                Publisher: The Rockefeller University Press
                ISSN (Print): 0021-9525
                ISSN (Electronic): 1540-8140
                Publication date (Print): 25 August 2008
                Volume: 182
                Issue: 4
                Pages: 777-790
                Affiliations
                Cancer Research UK Centre for Cell and Molecular Biology, Institute of Cancer Research, London SW3 6JB, England, UK
                Author notes

                Correspondence to Christopher J. Marshall: Chris.Marshall@ 123456icr.ac.uk

                Article
                Publisher ID: 200712050
                DOI: 10.1083/jcb.200712050
                PMC ID: 2518715
                PubMed ID: 18725541
                SO-VID: 1a79fef5-efba-4a6f-b1bb-bb645e7f58c6
                Copyright © © 2008 Smith et al.
                License:

                This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.jcb.org/misc/terms.shtml). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/).

                History
                Date received : 11 December 2007
                Date accepted : 28 July 2008
                Categories
                Subject: Research Articles
                Subject: Article

                ScienceOpen disciplines: Cell biology
                Data availability:
                ScienceOpen disciplines: Cell biology

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