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Updated: Mar 9, 2026
Isolation of Human Primary Valve Cells for In vitro Disease Modeling
Published on: April 16, 2021
Species-specific effects of aortic valve decellularization.
Mitchell C VeDepo1, Eric E Buse2, Rachael W Quinn2
1Cardiac Regenerative Surgery Research Laboratories of The Ward Family Heart Center, Children's Mercy Kansas City, 2401 Gillham Road, Kansas City, MO 64108, United States; Bioengineering Program, University of Kansas, 3135A Learned Hall, 1530 W. 15th St., Lawrence, KS 66045, United States.
Decellularization affects human and ovine heart valves differently due to species-specific cellularity and extracellular matrix changes. These findings are crucial for using decellularized valves in clinical applications and pre-clinical sheep models.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cardiovascular Research
Background:
- Decellularized heart valves show promise for valve replacement and tissue engineering.
- Pre-clinical testing in animal models, like sheep, is required before clinical use.
- Understanding species-specific effects of decellularization is crucial for accurate pre-clinical evaluations.
Purpose of the Study:
- To comparatively evaluate the effects of decellularization on human and ovine aortic heart valves.
- To investigate species-dependent variations in biochemical and biomechanical properties post-decellularization.
- To inform the use of decellularized heart valves and the relevance of ovine models.
Main Methods:
- Human and ovine aortic valves were subjected to an identical decellularization protocol.
- Cellularity was assessed before decellularization.
- Biomechanical properties (biaxial strain, peak stretch, relaxation) and collagen crosslinking were measured post-decellularization.
- Glycosaminoglycan content was also analyzed.
Main Results:
- Cell removal was equally effective in both species.
- Ovine valves had significantly higher initial cell density than human valves.
- Post-decellularization, ovine leaflets showed increased biaxial strain and peak stretch, unlike human leaflets.
- Ovine leaflets experienced reduced collagen crosslinking and glycosaminoglycans, impacting relaxation, while human leaflets did not.
- Decellularization resulted in species-specific biomechanical and biochemical alterations.
Conclusions:
- Identical decellularization processes can yield species-specific effects on heart valve properties.
- Higher initial cellularity and greater extracellular matrix changes in ovine valves contribute to these differences.
- These findings highlight the importance of considering species-specific responses in decellularized valve research and pre-clinical modeling.
