The influence of streptokinase on plasminogen activators inhibitor of type I (PAI-1) was investigated with the use of model systems in vitro and in vivo. It was defined, that intravenous streptokinase injection causes an increase in PAI-1 content in mammals' blood plasma. Experiments in vitro have shown that the increase in PAI-1 concentration takes place as a result of streptokinase action. It occurs due to platelets activation with subsequent PAI-1 secretion from their a-granules. It is established, that PAI-1 is secreted by platelets both in free and in complex forms. The data obtained in the work, allow to assume, that the simultaneous substantial increase in PAI-1 content with platelets activation, as a result of streptokinase influence, can lead to new thrombotic complications risk.

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