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Proteolysis and invasiveness of brain tumors: Role of urokinase-type plasminogen activator receptor

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Summary

The cellular receptor for urokinase-type plasminogen activator (uPAR) in glioblastoma cell lines has been identified and found to be similar to the uPAR expressed by other tumor cell lines. Increased levels of uPAR have been found in primary malignant brain tumor tissues, especially highly malignant glioblastoma, and, to a lesser degree, in malignant astrocytomas, suggesting that this receptor might be involved in efficient activation of pro-uPA and confinement of uPA activity on the cell surface of invading brain tumors. The cell surface uPARs in gliomas could constitute an optimum environment for the generation and activity of plasmin, which is known to play a crucial role in the dissolution of the extracellular matrix during tumor cell invasion.In situ hybridization studies have shown that uPAR mRNA is expressed abundantly in tumor cells and is consistently present at the invasive edges of malignant gliomas. These results imply that uPAR is involved in plasmincatalyzed proteolysis during glioma invasion and that interference with the uPA∶uPAR interactions could constitute a novel approach for developing therapeutic strategies to counteract invasion of brain tumors.

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Authors and Affiliations

  1. Department of Neurosurgery, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA

    Sanjeeva Mohanam, Raymond E. Sawaya, Masaaki Yamamoto & Jasti S. Rao

  2. Department of Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA

    Janet M. Bruner

  3. Department of Tumor Biology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA

    Garth L. Nicholson

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  1. Sanjeeva Mohanam
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  2. Raymond E. Sawaya
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Mohanam, S., Sawaya, R.E., Yamamoto, M. et al. Proteolysis and invasiveness of brain tumors: Role of urokinase-type plasminogen activator receptor. J Neuro-Oncol 22, 153–160 (1994). https://doi.org/10.1007/BF01052890

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