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Matrix metalloproteinase expression in nonrheumatic aortic stenosis
1Department of Medicine (Cardiovascular Medicine), Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, NY 10461, USA.
Summary
Matrix metalloproteinases (MMPs) are elevated in nonrheumatic aortic stenosis (NAS), suggesting their role in this degenerative valve disease. Increased MMP expression indicates a link between inflammation and NAS pathogenesis.
Area of Science:
- Cardiovascular Biology
- Biochemistry
- Pathology
Background:
- Nonrheumatic aortic stenosis (NAS) is a degenerative process involving valve thickening and inflammation.
- Matrix metalloproteinases (MMPs) degrade extracellular matrix components and are produced by inflammatory cells.
Purpose of the Study:
- To investigate the role of MMPs in the pathogenesis of nonrheumatic aortic stenosis.
- To test the hypothesis that MMPs are involved in NAS development.
Main Methods:
- Aortic valves from NAS patients and controls were analyzed histologically.
- Immunohistochemical staining was used to detect MMP-1, -2, -3, and -9 expression in valve tissue.
Main Results:
- NAS valves showed calcium deposits, fibrosis, and significant infiltration of macrophages, lymphocytes, and fibroblasts.
- MMP-1, -2, -3, and -9 were expressed in NAS valves, primarily by inflammatory cells.
- MMP-1, -2, and -3 were also found in normal valves, but MMP-9 was unique to NAS valves.
Conclusions:
- NAS is characterized by chronic inflammation involving macrophages and lymphocytes.
- Increased expression of MMP-1, -2, -3, and particularly MMP-9 in NAS valves supports their contribution to disease pathogenesis.