title: A protease-antiprotease system in antrochoanal polyp. I. Evidence for the existence of proactivator.
abstract: Tissue extract of antrochoanal polyps showed a faint lysis area on standard fibrin plates, but streptokinase (SK)-added tissue extract showed a large lysis area. No fibrinolytic activity was observed on plasminogen-free fibrin plates. It is concluded, therefore, that the fibrinolytic activity observed after SK addition is indicative of the existence of SK-responsive protein proactivator. The tissue extract did not contain plasminogen or antiprotease against trypsin or papain. It was stable at neutral pH at 37 degrees C and stable at acid pH at 70 degrees C. The role of proactivator is discussed in relation to the growth or enlargement of antrochoanal polyps.
mesh_terms: D000293:Adolescent; D000328:Adult; D004792:Enzyme Precursors / Q000378:metabolism*; D005260:Female; D005342:Fibrinolysis; D006801:Humans; D008297:Male; D009298:Nasal Polyps / Q000201:enzymology*; D010447:Peptide Hydrolases / Q000378:metabolism*; D011480:Protease Inhibitors / Q000378:metabolism*; D013300:Streptokinase
chemical_list: D004792:Enzyme Precursors; D011480:Protease Inhibitors; D010447:Peptide Hydrolases; D013300:Streptokinase