Dynamic flow for efficient partial decellularization of tracheal grafts: A preliminary rabbit study.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Bioengineered tracheal grafts offer a solution for long-segment tracheal defects.
• Partially decellularized tracheal grafts (PDTGs) promote host tissue regeneration and retain chondrocytes for mechanical support.

Purpose of the Study:

• To develop and evaluate a novel, tunable 3D-printed bioreactor for creating large animal PDTGs.
• To assess the efficiency and efficacy of the bioreactor in producing viable tracheal grafts.

Main Methods:

• Tracheal segments from New Zealand white rabbits were decellularized using conventional methods or a novel 3D-printed bioreactor with controlled fluid flow.
• Grafts were analyzed for decellularization, chondrocyte viability, DNA content, and mechanical properties.

Main Results:

• The bioreactor reduced processing time by 6 hours compared to conventional methods (10 hours).
• Bioreactor-processed PDTGs exhibited chondrocyte viability and mechanical strength similar to native trachea.
• Conventional processing resulted in poor chondrocyte viability and reduced mechanical strength.

Conclusions:

• The 3D-printed bioreactor is a promising tool for efficient production of large animal PDTGs.
• The bioreactor's flexibility is advantageous for clinical research and application.
• Future work will focus on optimizing flow conditions and evaluating in vivo performance.