Tissue engineered heart valves: autologous cell seeding on biodegradable polymer scaffold

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cardiovascular Surgery

Background:

• Tissue-engineered heart valves offer a promising alternative to traditional valve replacements.
• Autologous cells and biodegradable scaffolds are key components for successful tissue engineering.
• Previous work established the creation of engineered valve leaflets.

Purpose of the Study:

• To evaluate the in vivo performance and durability of autologous cell-seeded tissue-engineered pulmonary valve leaflets.
• To compare the outcomes of cell-seeded constructs versus acellular polymer scaffolds.
• To assess matrix deposition and cell persistence within the engineered leaflets.

Main Methods:

• Isolation and selective labeling of ovine endothelial cells and fibroblasts.
• Seeding of polyglycolic acid scaffolds with fibroblasts, followed by endothelial cell coating.
• Implantation of engineered leaflets into the pulmonary valve position in sheep, with acellular controls.
• Histological, biochemical, and biomechanical analysis at various time points.

Main Results:

• Acellular polymer leaflets completely degraded within 8 weeks.
• Cell-seeded tissue-engineered leaflets persisted in all experimental animals.
• Progressive collagen increase (4-hydroxyproline analysis) and presence of elastin and factor VIII confirmed matrix formation.
• Cell labeling confirmed the persistence of seeded autologous cells.

Conclusions:

• Autologous cell-seeded tissue-engineered valve leaflets demonstrate successful in vivo persistence and matrix generation.
• Biodegradable scaffolds seeded with autologous cells provide a viable platform for pulmonary valve tissue engineering.
• This approach holds potential for developing functional, regenerative heart valve replacements.