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• W2069121132 abstract "The present study was undertaken to assess the role of membrane-associated cathepsin B as an activator of receptor-bound single-chain urokinase-type plasminogen activator (pro-uPA) and to determine the importance of receptor-bound uPA activity in the destruction of extracellular matrix by tumor cells with subsequent invasion through basement membranes. Ovarian cancer HOC-I cells express pro-uPA/HMW-uPA and cathepsin B on their surface. uPAs are bound to a specific surface receptor, about 30% of which is saturated. 60% of the receptor-bound uPA is pro-uPA. No reduction in the specific binding of biotinylated DFP-HMW-uPA was observed when cells were cultivated in the presence of E-64, a cysteine proteinase inhibitor, for 24 h. Inhibition of cell-surface cathepsin B activity was associated with a decrease in cell-bound uPA activity to undetectable levels, and > 95% of the membrane-associated uPA was pro-uPA in cells cultivated with E-64. This suggested that receptor-bound pro-uPA cannot be converted to HMW-uPA in the absence of enzymatically-active cathepsin B. The significance of the expression of cell-surface uPA activity regarding invasive potential was examined in an in-vitro Matrigel invasion assay. Decreased cell-surface uPA activity was associated with a decrease in invasive potential. These data support our hypothesis that membrane-associated cathepsin B may be important for the conversion of pro-uPA to HMW-uPA and that receptor-bound uPA activity constitutes an efficient mechanism which contributes to tumor cell invasion. As HOC-I cells produce both uPA and cathepsin B, the implications of tumor-cell-derived pro-uPA activation by cellular proteinase cathepsin B should be considered." @default.
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• W2069121132 date "1993-07-01" @default.
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• W2069121132 title "Effects of membrane-associated cathepsin B on the activation of receptor-bound prourokinase and subsequent invasion of reconstituted basement membranes" @default.
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• W2069121132 doi "https://doi.org/10.1016/0167-4889(93)90109-3" @default.
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