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Updated: Jun 13, 2025
Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro
Published on: May 10, 2021
Ex vivo model of pathological calcification of human aortic valve
O S Kachanova1, N V Boyarskaya1, P M Docshin1
1Research Laboratory of Diseases with Excessive Calcification, Almazov National Medical Research Centre, Saint Petersburg, Russia.
Abstract:
The development of drug therapy for the pathological calcification of the aortic valve is still an open issue due to the lack of effective treatment strategies. Currently, the only option for treating this condition is surgical correction and symptom management. The search for models to study the safety and efficacy of anti-calcifying drugs requires them to not only be as close as possible to in vivo conditions, but also to be flexible with regard to the molecular studies that can be applied to them. The ex vivo model has several advantages, including the ability to study the effect of a drug on human cells while preserving the original structure of the valve. This allows for a better understanding of how different cell types interact within the valve, including non-dividing cells. The aim of this study was to develop a reproducible ex vivo calcification model based on valves from patients with calcific aortic stenosis. We aimed to induce spontaneous calcification in valve tissue fragments under osteogenic conditions, and to demonstrate the possibility of significantly suppressing it using a calcification inhibitor. To validate the model, we tested a Notch inhibitor Crenigacestat (LY3039478), which has been previously shown to have an anti-calcifying effect on interstitial cell of the aortic valve. We demonstrate here an approach to testing calcification inhibitors using an ex vivo model of cultured human aortic valve tissue fragments. Thus, we propose that ex vivo models may warrant further investigation for their utility in studying aortic valve disease and performing pre-clinical assessment of drug efficacy.
Insights
Developing an ex vivo model using human aortic valve tissue fragments offers a promising new approach for studying aortic valve disease. This method allows for testing anti-calcifying drugs and assessing their efficacy in a clinically relevant context.
Area of Science:
- Cardiovascular Biology
- Translational Medicine
- Drug Discovery
Background:
- Pathological calcification of the aortic valve lacks effective drug therapies, necessitating surgical intervention.
- Current research models for anti-calcifying drugs require high fidelity to in vivo conditions and flexibility for molecular studies.
- Ex vivo models offer advantages for studying drug effects on human cells while preserving native valve structure and cellular interactions.
Purpose of the Study:
- To develop a reproducible ex vivo model for studying aortic valve calcification using patient-derived valve tissue.
- To induce spontaneous calcification in aortic valve tissue fragments under osteogenic conditions.
- To demonstrate the suppression of calcification using an inhibitor and validate the model's utility.
Main Methods:
- Utilized aortic valve tissue fragments from patients with calcific aortic stenosis.
- Induced spontaneous calcification in vitro under osteogenic conditions.
- Tested the efficacy of Crenigacestat (LY3039478), a Notch inhibitor, as a calcification inhibitor.
Main Results:
- Successfully developed a reproducible ex vivo model of aortic valve calcification.
- Demonstrated significant suppression of calcification using the Notch inhibitor Crenigacestat.
- Validated the model's suitability for testing anti-calcifying agents on human aortic valve tissue.
Conclusions:
- Ex vivo cultured human aortic valve tissue fragments provide a valuable platform for studying aortic valve disease.
- This model facilitates pre-clinical assessment of drug efficacy for anti-calcifying therapies.
- Further investigation into ex vivo models is warranted for advancing aortic valve disease research and drug development.
