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* Departments of Medicine and Oncology, McGill University and Royal Victoria Hospital, Montreal, Quebec, Canada H3A 1A1;
Department of Pathology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA;
Department of Clinical Biochemistry, Haddassah Medical School, Jerusalem, Israel IL-91120;
§ Institute for Cancer Research and Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Ft. Worth, Texas 76107, USA;
** Department of Biology; Ångstrom Pharmaceuticals Inc., San Diego, California 92121, USA; and

Northwestern University School of Medicine, Chicago, Illinois 60611, USA
2Correspondence: McGill University Health Center, Room H4.67, 687 Pine Ave. West, Montreal, Quebec, Canada H3A 1A1. E-mail: srabbani{at}med.mcgill.ca; Å6 correspondence should be addressed to: T.R.J., mazar{at}angstrominc.com
Urokinase plasminogen activator (uPA) plays an important role in the progression of several malignancies including breast cancer. We have identified a noncompetitive antagonist of the uPAuPAR interaction derived from a nonreceptor binding region of uPA (amino acids 136143). This 8-mer capped peptide (Å6) inhibited breast cancer cell invasion and endothelial cell migration in a dose-dependent manner in vitro without altering cell doubling time. Intraperitoneal administration of Å6 resulted in a significant inhibition of tumor growth and suppressed the development of lymph node metastases in several models of breast cancer cell growth and metastasis. Large areas of tumor necrosis and extensive positive staining by TUNEL were observed on histological and immunohistochemical analysis of experimental tumor sections from Å6-treated animals. Å6 treatment also resulted in a decrease in factor VIII-positive tumor microvessel hot-spots. These results identify a new epitope in uPA that is involved in the uPAuPAR interaction and indicate that an antagonist based on this epitope is able to inhibit tumor progression by modulating the tumor microenvironment in the absence of direct cytotoxic effects in vivo.Guo, Y., Higazi, A. A., Arakelian, A., Sachais, B. S., Cines, D., Goldfarb, R. H., Jones, T. R., Kwaan, H., Mazar, A. P., Rabbani, S. A. A peptide derived from the nonreceptor binding region of urokinase plasminogen activator (uPA) inhibits tumor progression and angiogenesis and induces tumor cell death in vivo.
Key Words: apoptosis breast cancer endothelial cell tumor necrosis
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