Method for Targeted Cellular Seeding of Tubular Tissue-Engineered Scaffolds for Tracheal Regeneration Approaches

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Effective tracheal regeneration requires scaffolds mimicking native tissue structure and mechanical properties.
• Spatially controlled cell seeding is crucial for directing tissue development.
• Existing methods face challenges in achieving both mechanical robustness and precise cell organization.

Purpose of the Study:

• To develop and validate a novel tubular scaffold fabrication method for tracheal regeneration.
• To integrate a 3D-printed polycaprolactone (PCL) backbone with a collagen-hyaluronic acid (CHyA) layer.
• To achieve spatially selective seeding of respiratory epithelial cells and fibroblasts.

Main Methods:

• Fabrication of tubular and c-shaped scaffolds using 3D printing (polycaprolactone) and freeze-drying (collagen-hyaluronic acid).
• Mechanical characterization to assess scaffold robustness and durability.
• Utilizing custom-designed polylactic acid (PLA) accessories for precise, layer-specific cell deposition (Calu-3 epithelial cells and Wi38 fibroblasts).

Main Results:

• PCL reinforcement significantly improved scaffold structural integrity and durability.
• Successful spatial localization of epithelial cells on the inner scaffold layer and fibroblasts on the outer layer.
• Established an effective coculture system with enhanced epithelial coverage and sustained fibroblast viability.

Conclusions:

• Validated a scalable and customizable method for producing mechanically robust tubular scaffolds with precise spatial cell organization.
• The developed platform shows significant promise for tracheal tissue engineering.
• Potential applicability extends to other tubular tissue regeneration applications, such as vascular or gastrointestinal grafts.