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Plasminogen activators and matrix metalloproteinases in angiogenesis
1Dipartimento di Genetica e Microbiologia, Università di Pavia, Italy.
Enzyme & Protein
|January 1, 1996
Summary
The plasminogen activator (PA)-plasmin system and matrix metalloproteinases (MMPs) are crucial for angiogenesis. These enzymes degrade the extracellular matrix, enabling new blood vessel formation and growth factor activation.
Area of Science:
- Cell Biology
- Biochemistry
- Physiology
Background:
- Angiogenesis, the formation of new blood vessels, is essential for tissue development and repair.
- This process involves the migration and invasion of endothelial cells, requiring the degradation of the surrounding extracellular matrix (ECM).
Purpose of the Study:
- To elucidate the roles of specific proteolytic enzyme systems in the early stages of angiogenesis.
- To understand how endothelial cells degrade the basal lamina and invade surrounding tissues.
Main Methods:
- The study reviews experimental evidence on the involvement of the plasminogen activator (PA)-plasmin system and matrix metalloproteinases (MMPs) in angiogenesis.
- Analysis of the consequences of increased proteolytic activity on endothelial cell behavior and ECM components.
Main Results:
- The PA-plasmin system and MMPs are key degradative enzymes in angiogenesis.
- Increased proteolytic activity facilitates endothelial cell invasion, generates chemotactic ECM fragments, and mobilizes growth factors.
- Urokinase-type PA also influences endothelial cell proliferation and migration through non-proteolytic mechanisms.
Conclusions:
- Proteolytic enzymes, particularly PAs and MMPs, are indispensable for initiating angiogenesis.
- These enzymes orchestrate multiple critical events, including matrix degradation, cell migration, and growth factor release.
- Endothelial cell functions during angiogenesis are finely regulated by complex interactions involving enzyme activity, inhibitors, and cellular binding sites.