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. 1996 Oct;74(8):1168–1174. doi: 10.1038/bjc.1996.512

Up-regulation of urokinase-type plasminogen activator in squamous cell carcinoma of human larynx.

S Parolini 1, D Flagiello 1, A Cinquetti 1, R Gozzi 1, S Cristini 1, J Cappiello 1, P Nicolai 1, M Rusnati 1, M Presta 1, M M Tosatti 1
PMCID: PMC2075918  PMID: 8883400

Abstract

The expression of urokinase-type plasminogen activator (uPA) was investigated in squamous cell carcinoma of the human larynx. For this purpose, tissue extracts from 25 matched samples of normal mucosa and neoplastic larynx were compared for the levels of uPA activity as evaluated by a chromogenic PA assay and sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) zymography. Also, uPA antigen was quantified by enzyme-linked immunosorbent assay (ELISA) in 19 cases. The results demonstrate a significant increase in the levels of uPA activity and protein in tumour tissue extracts, more pronounced in tumours with lymph node metastases. Immunohistochemistry performed on 70 biopsies showed that uPA positivity is present both in neoplastic cells and in fibroblast-like cells and macrophages. However, depending on the histological grading and invasive capacity of the tumour, a pronounced intra- and intertumoral heterogeneity in uPA staining was observed. In situ hybridisation confirmed the presence of uPA mRNA in both tumour and stromal cells. The present study provides experimental evidence for a role of uPA in the invasive growth of human laryngeal carcinoma.

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