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The microvascular extracellular matrix. Developmental changes during angiogenesis in the aortic ring-plasma clot
The American Journal of Pathology
|July 1, 1987
Summary
The extracellular matrix of developing microvessels changes dynamically, with endothelial cells actively synthesizing fibronectin, laminin, and collagens. This matrix composition influences blood vessel development and structure.
Area of Science:
- Cell Biology
- Biochemistry
- Developmental Biology
Background:
- The extracellular matrix (ECM) is crucial for tissue development and function.
- Understanding microvessel ECM composition is key to studying angiogenesis.
Purpose of the Study:
- To investigate the dynamic changes in the extracellular matrix composition during microvessel development.
- To identify the specific ECM components synthesized by endothelial cells.
Main Methods:
- Light and electron immunohistochemistry on rat aorta plasma clot cultures.
- Antibodies against fibronectin, laminin, and collagen Types I, III, IV, and V were used.
Main Results:
- Early sprouts showed fibronectin and Type V collagen, with laminin and Type IV collagen accumulating over time.
- Endothelial cells actively synthesized fibronectin, laminin, and collagen Types IV and V.
- Mature microvessels had a complex ECM with varying collagen types and fibronectin.
Conclusions:
- Microvascular ECM composition undergoes significant dynamic changes during angiogenesis.
- The evolving ECM influences endothelial cell behavior and capillary morphogenesis.