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- W1600580653 abstract "The multipotent drug suramin, which is currently being studied as an anticancer agent, was found to inhibit the interaction between the urokinase-type plasminogen activator (u-PA) and its cellular receptor. 50% inhibition of binding was obtained with a suramin concentration between 30 and 60 micrograms/ml when using U937 cells and a ligand concentration of 0.3 nM. This concentration of the drug is well below the serum levels found in suramin-treated patients. Inhibition of binding was also demonstrated at the molecular level, using chemical cross-linking or an enzyme-linked immunosorbent assay-type technique based on the ligand interaction. The inhibition was not caused by a mere polyanion effect since polysulfates such as heparin, heparan sulfate, and pentosan polysulfate were non-inhibitory or showed only a very weak inhibition. However, polysulfonated compounds with structures resembling suramin (i.e. trypan blue and Evans blue) did prove inhibitory. The inhibition found with suramin showed a concentration dependence consistent with a mixed competitive and noncompetitive mechanism. The off-rate of prebound ligand was accelerated by the drug. It is speculated that the present effect may contribute to the anti-invasive properties of suramin by destroying the cellular potential for localized plasminogen activation and proteolytic matrix degradation." @default.
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- W1600580653 date "1993-03-01" @default.
- W1600580653 modified "2023-10-16" @default.
- W1600580653 title "Binding of the urokinase-type plasminogen activator to its cell surface receptor is inhibited by low doses of suramin." @default.
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- W1600580653 doi "https://doi.org/10.1016/s0021-9258(18)53416-5" @default.
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