Form Follows Function: Advances in Trilayered Structure Replication for Aortic Heart Valve Tissue Engineering.

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Regenerative Medicine

Background:

• Tissue engineering aortic heart valves presents significant challenges due to native valve complexity.
• Scaffolds for valve substitutes need mechanical durability and controlled degradation for remodeling.

Purpose of the Study:

• To highlight key factors influencing long-term durability in tissue-engineered heart valves.
• To propose a scaffold design strategy based on native aortic valve architecture.

Main Methods:

• Review of literature focusing on scaffold design, histoarchitecture, and cell integration.
• Analysis of native aortic valve structure and cellular mechanics.
• Proposal of a trilayered scaffold template.

Main Results:

• Three critical aspects for tissue-engineered valve durability are identified: trilayered histoarchitecture, 3D shape replication, and precise cell integration.
• The native valve's spongiosa layer is crucial for cushioning and mechanical resilience.
• Accurate replication of structure and micro-loads is essential for cellular matrix remodeling.

Conclusions:

• A trilayered scaffold design mimicking the native aortic valve's histoarchitecture can enhance mechanical durability.
• Successful tissue regeneration and extended valve durability depend on replicating native valve structure and mechanical micro-loads.
• Optimizing cell type, number, and location within the scaffold is vital for homeostatic matrix maintenance.