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The urokinase plasminogen activator system in cancer: Recent advances and implication for prognosis and therapy

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Abstract

Cancer dissemination and metastasis is synonymous with invasive cell migration; a process in which the extracellular matrix (ECM) plays the dual role of the substratum on which the cells move as well as the physical obstacle that the cells have to surpass. To degrade the physical obstacle, which the ECM poses in the direction of migration, cells use proteolytic enzymes capable of degrading the ECM components. A major protease system responsible for ECM degradation is the plasminogen activation system, which generates the potent serine protease plasmin. The subject of this review, the urokinase-type plasminogen activator (uPA) and its receptor (uPAR), plays an impressive range of distinct, but overlapping functions in the process of cancer invasion and metastasis: Firstly, uPA/uPAR promotes extracellular proteolysis by regulating plasminogen activation. Secondly, uPA/uPAR regulates cell/ECM interactions as an adhesion receptor for vitronectin (Vn) and through its capacity to modulate integrin function. Thirdly, uPA/uPAR regulates cell migration as a signal transduction molecule and by its intrinsic chemotactic activity. This review is focused on recent insight into the cancer related biology of the uPA/uPAR system as well as its implications for clinical cancer diagnosis, prognosis and therapy.

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  1. Department of Molecular Biology and Functional Genomics, DIBIT, Università Vita-Salute San Raffaele, Via Olgettina 58, 20132, Milan, Italy

    Nicolai Sidenius

  2. San Raffaele Scientific Institute, Via Olgettina 58, 20132, Milan, Italy

    Francesco Blasi

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Sidenius, N., Blasi, F. The urokinase plasminogen activator system in cancer: Recent advances and implication for prognosis and therapy. Cancer Metastasis Rev 22, 205–222 (2003). https://doi.org/10.1023/A:1023099415940

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