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A Simplified Model for Heterotopic Heart Valve Transplantation in Rodents
Published on: September 21, 2021
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Decellularized allogeneic heart valves demonstrate self-regeneration potential after a long-term preclinical
Laura Iop1, Antonella Bonetti2, Filippo Naso1
1Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy.
Plos One
|June 19, 2014
Summary
Decellularized heart valves can regenerate within the body without preconditioning, offering a promising alternative for valve replacement, especially in children. This study shows successful in vivo self-regeneration and remodeling in a large animal model.
Area of Science:
- Regenerative Medicine
- Biomaterials Science
- Cardiovascular Surgery
Background:
- Tissue-engineered heart valves (TEHVs) require extensive preconditioning.
- Decellularized heart valves offer potential for in vivo regeneration.
Purpose of the Study:
- To investigate the in vivo self-regeneration of non-preconditioned decellularized heart valves.
- To evaluate their efficacy as replacements for the right ventricular outflow tract (RVOT).
Main Methods:
- Decellularized porcine aortic valves implanted in Vietnamese pigs (n=11) for 6 and 15 months.
- Histology, immunohistochemistry, electron microscopy, gene expression, and hemodynamic assessments performed.
- Native valves used as controls.
Main Results:
- Valves demonstrated adequate hemodynamic performance and progressive in vivo repopulation.
- Colonizing cells exhibited native-like phenotypes, synthesizing collagen and elastin.
- New blood vessel formation (angiogenesis) and neoinnervation observed.
- No signs of calcification, fibrosis, thrombosis, or adverse immune reactions detected.
- Cells expressing stem cell markers identified, indicating regenerative potential.
Conclusions:
- Non-preconditioned decellularized allogeneic valves support in vivo cell homing and tissue remodeling.
- These valves represent a promising, cost-effective alternative for heart valve replacement, particularly for pediatric patients.
- The findings support the potential for spontaneous in-body self-regeneration of decellularized valve scaffolds.
