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Localization of vitronectin in the normal and atherosclerotic human vessel wall
B E van Aken1, D Seiffert, T Thinnes
1Department of Vascular Biology, Scripps Research Institute, La Jolla, CA 92037, USA.
Insights
Vitronectin (Vn) is present in normal blood vessels and increases in atherosclerotic arteries, suggesting a role in vascular disease development. This protein
Area of Science:
- Vascular Biology
- Proteomics
- Pathogenesis of Atherosclerosis
Background:
- Vitronectin (Vn) regulates key cellular processes like migration and tissue remodeling.
- These processes are critically involved in the development of atherosclerosis.
- Understanding Vn's distribution in blood vessels is crucial for elucidating its role in vascular disease.
Purpose of the Study:
- To investigate the distribution of Vitronectin (Vn) antigen in normal and atherosclerotic human blood vessels.
- To correlate Vn deposition with specific features of atherosclerotic plaques.
- To explore the relationship between Vn protein and its transcript in the vessel wall.
Main Methods:
- Immunohistochemistry was used to detect Vn antigen distribution in human blood vessels.
- Analysis included both apparently normal and atherosclerotic samples from various arteries.
- In situ hybridization was employed to assess Vn transcript presence.
Main Results:
- Vitronectin (Vn) antigen was found in the internal and external elastic laminae and adventitia of normal vessels, often near elastin.
- Pulmonary arteries also showed Vn in the media, while the intima was consistently devoid of Vn.
- Increased Vn deposition was observed in atherosclerotic arteries, particularly in plaque material near cholesterol clefts and fibrous tissue.
Conclusions:
- Vitronectin (Vn) is a component of the normal human vessel wall.
- Elevated local deposition of Vn in atherosclerotic arteries suggests a potential role in the pathogenesis of vascular disease.
- The absence of detectable Vn transcript despite abundant protein indicates post-transcriptional regulation or protein accumulation.
Abstract:
Vitronectin (Vn) regulates proteolytic enzyme systems, as well as cell migration and tissue remodelling. These processes have been implicated in the pathogenesis of atherosclerosis. In this study, the distribution of Vn antigen in apparently normal and atherosclerotic human blood vessels was evaluated. Normal and diseased vessels showed Vn immunostaining in the lamina elastica interna and externa, and in strand-like structures in the adventitia. In most of these instances, the Vn antigen appeared to be located in the proximity of elastin. In pulmonary arteries, Vn staining was additionally detected in the media. The intima was devoid of Vn antigen in all vessels studied. In general, there was increased deposition of Vn antigen in the atherosclerotic arteries. In particular, strong Vn staining was apparent in amorphous material adjacent to cholesterol clefts and in acellular fibrous tissue, in plaques present in the carotic artery and aorta. Collagen layers and fresh fibrin depositions were devoid of Vn antigen. In spite of the abundance of Vn immunostaining throughout the normal and diseased vessel wall, the Vn transcript was not detectably by in situ hybridization. These results indicate that Vn is a constituent of the normal vessel wall and raise the possibility that increased local deposition of Vn may be related to the development of atherosclerotic vascular disease.