Related Experiment Videos
Relation between arterial intimal thickening and the vasa-vasorum.
Virchows Archiv. A, Pathological Anatomy and Histopathology
|January 1, 1985
Summary
New research suggests artery intimal thickening originates from vasa vasorum pericytes. Studies show these cells migrate and proliferate, forming granulation tissue that leads to thickening, challenging previous concepts.
Area of Science:
- Vascular Biology
- Histopathology
- Cell Biology
Background:
- Intimal thickening is a key feature in various vascular diseases.
- The cellular origin of intimal thickening has been debated.
- Previous theories focused on endothelial cells or smooth muscle cells from the media.
Purpose of the Study:
- To investigate a novel concept for the cellular origin of arterial intimal thickening.
- To identify the specific cell types involved in myointimal proliferation.
- To elucidate the process of granulation tissue formation within arteries.
Main Methods:
- Isolation of arterial segments between ligatures.
- Intravascular contrast techniques to visualize vasa vasorum.
- Autoradiography using 3H-thymidine to track DNA synthesis.
- Histopathological examination of transitional cell forms.
Main Results:
- Vasa vasorum penetration and intra-arterial granulation tissue formation were observed.
- DNA synthesis initiated in vasa vasorum pericytes and adjacent media, preceding intimal thickening.
- Transitional cell forms between pericytes and myointimal cells were identified.
- Restoring circulation to ligated segments induced typical intimal thickening.
Conclusions:
- Arterial intimal thickening originates from cells of the vasa vasorum, particularly pericytes.
- Pericytes migrate and proliferate, contributing to granulation tissue and subsequent myointimal thickening.
- This finding offers a new perspective on the pathogenesis of intimal hyperplasia.