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PubMed1959

The streptokinase-plasminogen system. I. Its effect on the pathogenicity of streptococci and other organisms for mice.

Human plasminogen, plasma, or serum increased the pathogenicity of six streptokinase-positive streptococcal strains for mice. Combinations of commercial streptokinase and plasminogen or streptokinase and plasma did not usually increase mouse mortality to a greater degree than did plasminogen or plasma alone, suggesting that the maximal effective amount of streptokinase was produced by the organisms. The pathogenicity of Salmonella paratyphi (fibrinolysin variable) and a Group D streptococcus (streptokinase-negative) was not increased by plasminogen, plasma, or streptokinase, whereas a combination of streptokinase and plasminogen, or streptokinase and plasma did significantly increase mouse mortality resulting from these organisms. Combinations of certain concentrations of streptokinase and plasminogen increased the pathogenicity of a fibrinolysin-negative staphylococcal strain for mice to a greater extent than did either substance alone. The observed results provide evidence that streptokinase, by an interaction with plasminogen, contributes to the pathogenicity of streptokinase-positive streptococci.

Animals↗
PubMed1981

Plasmin inhibitors in different fibrinolytic treatment patterns.

The variations of different antiplasmins were studied in a group of patients suffering from thromboembolic conditions and receiving three different regimens of thrombolytic treatment with streptokinase and urokinase. The evaluation of the antiproteases was carried out by chromogenic substrate and radial immunodiffusion. The different administration patterns of the fibrinolytic agents were followed by a clear drop in fast antiplasmin and alpha 2-macroglobulin, while alpha 1-antitrypsin was increased. Antithrombin-III activity was reduced while its protein rose in the intermittent treatment with streptokinase. In the conventional treatment with streptokinase, both the activity and the protein of antithrombin-III increased. With urokinase both the protein and the activity of antithrombin-III were slightly reduced. Plasminogen and fibrinogen decreased in the different regimens of thrombolytic treatment, being more evident in continuous administration of streptokinase.

Antithrombin III↗