title: Acyl-enzymes as thrombolytic agents in a rabbit model of venous thrombosis.
abstract: A derivative of human lys-plasmin in which the active site has been reversibly acylated (BRL 26920; p-anisoyl human lys-plasmin) has been examined as a fibrinolytic agent in a previously described rabbit model of venous thrombosis and shown to be significantly more active and less fibrinogenolytic than free plasmin. A p-anisoylated derivative of a streptokinase (SK)-activated plasmin preparation was significantly less fibrinogenolytic in vivo than the non-acylated enzyme. Acylation increased the fibrinolytic activity of preparations of SK-plasmin activator complexes. BRL 26921, the active site anisoylated derivative of the primary 2-chain SK-plasminogen complex was the most potent fibrinolytic agent studied. SK-Val442-plasminogen complexes, free or acylated, were biologically inactive in this model and confirm the essential nature of fibrin binding processes for effective thrombolysis in vivo.
mesh_terms: D000215:Acylation; D000577:Amides / Q000378:metabolism; D000818:Animals; D005338:Fibrin Fibrinogen Degradation Products / Q000378:metabolism; D005341:Fibrinolysin / Q000378:metabolism*; D005342:Fibrinolysis; D006801:Humans; D010958:Plasminogen / Q000378:metabolism*; D011817:Rabbits; D013300:Streptokinase / Q000494:pharmacology; D013924:Thrombophlebitis / Q000188:drug therapy
chemical_list: D000577:Amides; D005338:Fibrin Fibrinogen Degradation Products; D010958:Plasminogen; D013300:Streptokinase; D005341:Fibrinolysin