Deregulation of the signaling pathways controlling urokinase production. Its relationship with the invasive phenotype

We review the evidence in support of the notion that, upon experimental oncogenic transformation or in spontaneous human cancers, mitogenesis and expression of urokinase (uPA) and its receptor (uPAR) are activated through common signaling complexes and pathways. It is well documented that uPA, uPAR...

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Veröffentlicht in:European journal of biochemistry 1999-07, Vol.263 (2), p.295-304
Hauptverfasser: Aguirre Ghiso, J A, Alonso, D F, Farías, E F, Gomez, D E, de Kier Joffè, E B
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container_title European journal of biochemistry
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creator Aguirre Ghiso, J A
Alonso, D F
Farías, E F
Gomez, D E
de Kier Joffè, E B
description We review the evidence in support of the notion that, upon experimental oncogenic transformation or in spontaneous human cancers, mitogenesis and expression of urokinase (uPA) and its receptor (uPAR) are activated through common signaling complexes and pathways. It is well documented that uPA, uPAR or metalloproteinases (MMPs) are overexpressed in tumor cells of mesenchymal or epithelial origin and these molecules are required for tumor invasion and metastasis. Furthermore, oncogenic stimuli, which may render the transformed cells tumorigenic and metastatic in vivo, activate, in a constitutive fashion, the extracellular-regulated kinases (Erk 1 and 2) classical mitogenic pathway and others such as the NH(2)-Jun-kinase (Jnk). Cells from human tumors or oncogene-transformed cells overexpress uPA and uPAR, and also show a sustained activation of the above-mentioned signaling modules. In this paper we show that the classical mitogenic pathway involving Ras-Erk, PKC-Erk or Rac-JNK, among others, is activated by growth factors or endogenously by oncogenes, and constitutively activates uPA and uPAR expression. All the data obtained from human tumors or experimental systems, incorporated into a general model, indicate that oncogenic stimuli lead to the constitutive activation of mitogenesis and uPA and its receptor expression, through the activation of the same classical and nonclassical signaling complexes and pathways that regulate cell proliferation. We also discuss contrasting points of view. For instance, what governs the differential regulation of mitogenesis and the signal that leads to protease overexpression in a way that allows normal cells during physiological events to respond to growth factors, and proliferate without overexpressing extracellular matrix (ECM) proteases? Or how can cells remodel their microenvironment without proliferating? What restrains benign tumors from overexpressing tumor-associated proteases when they certainly have the mitogenic signal fully activated? This may occur by the differential regulation of transcriptional programs and recent reports reviewed in this paper may provide an insight into how this occurs at the signaling and transcriptional levels.
doi_str_mv 10.1046/j.1432-1327.1999.00507.x
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subjects Cell Transformation, Neoplastic
Gene Expression Regulation, Neoplastic
Humans
Models, Biological
Signal Transduction
Tumor Suppressor Protein p53 - metabolism
Urokinase-Type Plasminogen Activator - biosynthesis
Urokinase-Type Plasminogen Activator - genetics
title Deregulation of the signaling pathways controlling urokinase production. Its relationship with the invasive phenotype
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