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Pericellular proteases in angiogenesis and vasculogenesis.
Victor W M van Hinsbergh1, Marten A Engelse, Paul H A Quax
1Laboratory for Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands. v.vanhinsbergh@vumc.nl
Arteriosclerosis, Thrombosis, and Vascular Biology
|February 14, 2006
Summary
Pericellular proteases, including matrix metalloproteinases (MMPs), are crucial for blood vessel formation (angiogenesis). They regulate growth factors and matrix degradation, influencing cell migration and neovascularization in disease.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Pericellular proteases are key regulators of angiogenesis and vasculogenesis.
- These enzymes include matrix metalloproteinases (MMPs), serine proteases, cysteine cathepsins, and membrane-bound aminopeptidases.
- Specific inhibitors modulate protease activity, highlighting their regulatory complexity.
Purpose of the Study:
- To elucidate the multifaceted roles of pericellular proteases in initiating and regulating angiogenesis.
- To understand how proteases interact with angiogenic factors and the extracellular matrix.
- To identify protease-dependent mechanisms governing endothelial cell migration and survival during neovascularization.
Main Methods:
- The study reviews the functions of various proteases, focusing on matrix metalloproteinases (MT1-MMP, MMP-2, MMP-9).
- It examines protease localization to cell membranes via interactions with integrins and CD44.
- Analysis of protease-mediated activation, liberation, and modification of growth factors and matrix degradation was performed.
Main Results:
- Major roles in initiating angiogenesis are attributed to MT1-MMP, MMP-2, and MMP-9.
- Proteases facilitate neovascularization by activating growth factors and degrading the extracellular matrix.
- Protease-protein complexes at the cell front are essential for endothelial cell migration and survival, while excessive proteolysis impairs angiogenesis.
Conclusions:
- Pericellular proteases are critical for neovascularization, influencing cell migration, growth factor activity, and matrix remodeling.
- MMP-9 and cathepsin L enhance angiogenesis by recruiting accessory cells.
- Understanding protease complexity offers therapeutic targets for diseases involving aberrant neovascularization.