Abstract
A new, sensitive and specific immunocapture enzyme (ICE) assay for quantitation of the enzymatic activity of cancer procoagulant (CP) has been developed. The assay had good reproducibility (inter- and intra-assay CV were 6.4% and 5.7% respectively) and was linear for concentrations of CP from 0.5 microgram/ml to 10 micrograms/ml (r2 = 0.995). Using this assay the inhibition of CP by iodoacetamide, mercuric chloride, E-64, leupeptin and antipain was demonstrated. There was no significant effect of cystatin and natural plasma proteinase inhibitors alpha 1-antitrypsin, alpha 1-antichymotrypsin, alpha 2-macroglobulin and antithrombin-III/heparin, on the activity of the CP.
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