A bio-adaptive physical hydrogel enables dynamic tissue engineering for tracheal reconstruction

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Organ functionalization is complex, requiring multilayered tissues and cellular remodeling.
• Clinical need exists for long-segment tracheal reconstruction methods.
• Current approaches lack dynamic adaptation to native tissue development.

Purpose of the Study:

• To develop a dynamic tissue engineering (DTE) strategy for tracheal reconstruction.
• To utilize a bio-adaptive physical hydrogel (BP-Gel) to emulate tracheal development.
• To enable dynamic regeneration of key tracheal tissue components.

Main Methods:

• Chondrocytes were cultured within BP-Gel to induce cartilage ring formation via an embryo-like chondrification process.
• The BP-Gel's percolation network adapted to cell migration and aggregation.
• Inter-ring spaces were treated with IL-Gel (anti-inflammatory cytokines) to promote vascularization and epithelial maturation.

Main Results:

• Cartilage rings formed with native-like multilayered morphology, enhancing mechanical stability and resisting degradation.
• The DTE strategy successfully reconstructed a functional trachea in a rabbit tracheal defect model.
• The regenerated trachea mimicked native structure and physiology.

Conclusions:

• The dynamic tissue engineering strategy using BP-Gel offers a promising, clinically relevant approach for tracheal reconstruction.
• This method emulates native tracheal development and enables dynamic regeneration.
• The strategy addresses the need for long-segment tracheal repair with enhanced mechanical properties and physiological function.