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Osteopontin is expressed in human aortic valvular lesions
K D O'Brien1, J Kuusisto, D D Reichenbach
1Department of Medicine, University of Washington, Seattle 98195, USA.
Circulation
|October 15, 1995
Summary
Calcification in aortic stenosis may be actively regulated, not just degenerative. Osteopontin protein and macrophage presence are linked to aortic valve calcification, suggesting potential therapeutic targets.
Area of Science:
- Cardiovascular Biology
- Biomedical Research
- Pathology
Background:
- Aortic stenosis calcification was considered degenerative.
- Recent findings indicate chronic inflammation in aortic stenosis lesions.
- This suggests calcification might be actively regulated.
Purpose of the Study:
- Investigate osteopontin presence in human aortic stenosis lesions.
- Determine if osteopontin is linked to calcification and inflammation in aortic valves.
Main Methods:
- Morphological and immunohistochemical analysis of 14 human aortic valves.
- Characterized calcification, macrophage accumulation, and osteopontin expression.
- Used in situ hybridization to localize osteopontin mRNA.
Main Results:
- Found significant associations between osteopontin expression and calcification.
- Demonstrated a strong link between osteopontin and macrophage accumulation.
- Localized osteopontin mRNA to macrophages within aortic stenosis lesions.
Conclusions:
- Aortic stenosis calcification may be an actively regulated process.
- Potential for therapeutic control by modifying inflammation or osteopontin.
- Osteopontin may modulate calcification in the aortic valve.