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Pathophysiology of the plasminogen/plasmin system
International Journal of Clinical & Laboratory Research
|January 1, 1996
Summary
Mice lacking key fibrinolytic system components, like plasminogen, show impaired clot removal and growth issues. These models help clarify the plasminogen/plasmin system's role in health and disease.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- The human fibrinolytic or plasminogen/plasmin system is crucial for various biological processes.
- Genetic deficiencies in fibrinolytic components have been created in mice to study their in vivo functions.
Discussion:
- Plasminogen deficiency in mice leads to spontaneous fibrin deposition, impaired thrombolysis, and reduced growth, fertility, and survival.
- Deficiencies in plasminogen activator inhibitor-1 (PAI-1) show contrasting effects in mice (resistance to thrombosis) and humans (delayed rebleeding).
- Mice lacking tissue-type or urokinase-type plasminogen activators exhibit reduced thrombolytic potential, spontaneous fibrin deposits, impaired macrophage function, and severe thrombotic phenotypes.
Key Insights:
- Mice models with targeted gene disruptions of fibrinolytic system components provide critical insights into in vivo physiology and pathology.
- Plasminogen-deficient mice exhibit spontaneous fibrin deposition and impaired thrombolytic capacity.
- Combined deficiencies of plasminogen activators result in severe thrombotic phenotypes, reduced fertility, growth retardation, and shorter survival.
Outlook:
- These genetically modified mouse models are invaluable tools for investigating the physiological and pathophysiological roles of the plasminogen/plasmin system.
- Further research using these models can elucidate mechanisms underlying thrombosis, inflammation, and tissue repair.
- Understanding these pathways may lead to novel therapeutic strategies for thrombotic and bleeding disorders.