Related Experiment Video
Updated: May 21, 2026
05:47
Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro
Published on: May 10, 2021
Amyloid substance within stenotic aortic valves promotes mineralization
Audrey Audet1, Nancy Côté, Christian Couture
1Laboratoire d'Études Moléculaires des Valvulopathies (LEMV), Groupe de Recherche en Valvulopathies (GRV), Quebec Heart and Lung Institute/Research Center, Department of Surgery, Québec City, QC, CanadaQuebec Heart and Lung Institute/Research Center, Québec City, QC, Canada, andDepartment of Social and Preventive Medicine, Division of Kinesiology, Laval University, Québec City, QC, Canada.
Histopathology
|May 31, 2012
Summary
Apolipoprotein AI (Apo-AI) forms amyloid deposits in calcific aortic valve disease (CAVD), promoting valve mineralization and cell death. This finding highlights a novel mechanism in CAVD pathogenesis.
Area of Science:
- Cardiovascular Research
- Biochemistry
- Pathobiology
Background:
- Apolipoprotein accumulation is implicated in calcific aortic valve disease (CAVD) pathogenesis.
- The role of apolipoprotein-derived amyloid in CAVD requires further investigation.
Purpose of the Study:
- To investigate the hypothesis that apolipoprotein-derived amyloid contributes to the development of CAVD.
- To identify the specific apolipoproteins involved and their role in valve pathology.
Main Methods:
- Analysis of 70 explanted CAVD valves and 15 control valves using Congo red staining for amyloid.
- Immunohistochemistry to detect apolipoprotein AI (Apo-AI) and TUNEL assays for apoptosis.
- In vitro studies using CAVD-derived amyloid extracts on valvular interstitial cells.
Main Results:
- Amyloid deposition was detected in all CAVD valves, correlating positively with plasma high-density lipoprotein and Apo-AI levels.
- Apo-AI was identified as a major component of amyloid deposits within CAVD valves, co-localizing with fibrillar amyloid and apoptosis near mineralized areas.
- CAVD-derived amyloid extracts induced apoptosis and mineralization in isolated aortic valvular interstitial cells.
Conclusions:
- Apolipoprotein AI is a key component of amyloid substance found in CAVD valves.
- Amyloid deposits in CAVD promote valve mineralization by inducing apoptosis in valvular interstitial cells.
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