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.
FASEB J
; 14(10): 1400-10, 2000 Jul.
Article
en En
| MEDLINE
| ID: mdl-10877833
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 uPA-uPAR interaction derived from a nonreceptor binding region of uPA (amino acids 136-143). This 8-mer capped peptide (A6) inhibited breast cancer cell invasion and endothelial cell migration in a dose-dependent manner in vitro without altering cell doubling time. Intraperitoneal administration of A6 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 A6-treated animals. A6 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 uPA-uPAR 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.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fragmentos de Péptidos
/
Neoplasias de la Mama
/
Activador de Plasminógeno de Tipo Uroquinasa
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Female
/
Humans
Idioma:
En
Revista:
FASEB J
Asunto de la revista:
BIOLOGIA
/
FISIOLOGIA
Año:
2000
Tipo del documento:
Article
País de afiliación:
Canadá
Pais de publicación:
Estados Unidos