A modern data review on the importance of fibrinolysis system is given. A considerable success has been scored during the study of molecular parameters of fibrinolysis system: the plasminogen, plasmin, its inhibitors, plasminogen activators and the mechanism of activation system have been characterized. The entrance of A, K, C, P and PP vitamins has been established to be necessary for the normal functioning of the fibrinolysis system; the dependence of the blood fibrinolytic activity upon the initial plasminogen content and concentration of its activators in blood has been revealed. The plasminogen activator depletion in tissues has been shown to be one of the reasons of some pathological states development, especially at cardiovascular diseases. The increase of fibrinolysis level by the active fibrinolytic ferment injection in blood has a medical effect at thrombosis. The ferment fibrinolysin received in the laboratory is successfully used in clinical practice. Some other activators of fibrinolytic system: tricholysine and longolytin from the culture of saprophyte fungi, plasminogen activator from the pig heart and the cells culture of the calf kidney have been received and are being studied.
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