title: Human urokinase receptor concentration in malignant and benign breast tumors by in vitro quantitative autoradiography: comparison with urokinase levels.
abstract: We measured the tissue concentration of human urokinase receptor (uPAR) in 22 breast carcinomas and 9 benign breast lesions using in vitro quantitative autoradiography. Tissue sections were incubated with increasing concentrations of 125I-pro-urokinase in the presence or absence of unlabeled competitor. Breast carcinomas were found to contain 5 times more uPAR than benign breast lesions with respect to their protein content [523 +/- 72 versus 108 +/- 20 (SE) fmol/mg (P < 0.001)]. Simultaneous quantitation of urokinase (uPA) by immunoenzymatic assay on tissue extracts from the same specimens showed that breast carcinomas also contain 19 times more uPA than benign tumors (611 +/- 134 versus 32 +/- 8 fmol/mg) (P < 0.01). The reliability of quantitative autoradiography measurements was confirmed by uPAR cross-linking assay on membrane fraction from either U937 histiocytic lymphoma cells or breast carcinomas and immunoperoxidase staining with an anti-uPAR antibody on tumor sections. Also, immunoperoxidase staining with an anti-uPA monoclonal antibody showed that uPA is indeed localized on the plasma membrane of epithelial tumor cells in confined areas of breast carcinomas whereas cells from benign breast lesions were devoid of uPA under the same experimental conditions. In conclusion, our findings support the hypothesis that uPAR plays a central role in the acquisition of an invasive phenotye and favor its potential use as a prognostic factor in patients with breast carcinoma.
authors.affiliation: Università degli Studi Federico II, Facoltà de Medicina, Naples, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Del Vecchio
authors.forename: M P
authors.initials: MP
authors.lastname: Stoppelli
authors.forename: M V
authors.initials: MV
authors.lastname: Carriero
authors.forename: R
authors.initials: R
authors.lastname: Fonti
authors.forename: O
authors.initials: O
authors.lastname: Massa
authors.forename: P Y
authors.initials: PY
authors.lastname: Li
authors.forename: G
authors.initials: G
authors.lastname: Botti
authors.forename: M
authors.initials: M
authors.lastname: Cerra
authors.forename: G
authors.initials: G
authors.lastname: D'Aiuto
authors.forename: G
authors.initials: G
authors.lastname: Esposito
mesh_terms: D000328:Adult; D000368:Aged; D001345:Autoradiography; D001941:Breast Diseases / Q000201:enzymology* / Q000378:metabolism*; D001943:Breast Neoplasms / Q000098:blood supply / Q000201:enzymology* / Q000648:ultrastructure*; D002455:Cell Division; D002462:Cell Membrane / Q000648:ultrastructure; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008875:Middle Aged; D009389:Neovascularization, Pathologic; D011379:Prognosis; D011956:Receptors, Cell Surface / Q000378:metabolism*; D055293:Receptors, Urokinase Plasminogen Activator; D014018:Tissue Distribution; D014407:Tumor Cells, Cultured; D014568:Urokinase-Type Plasminogen Activator / Q000378:metabolism*
chemical_list: C524898:PLAUR protein, human; D011956:Receptors, Cell Surface; D055293:Receptors, Urokinase Plasminogen Activator; D014568:Urokinase-Type Plasminogen Activator