Characterization and in vivo study of decellularized aortic scaffolds using closed sonication system

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Extracellular matrix (ECM) bioscaffolds are crucial in tissue engineering due to their inherent structural, biochemical, and biomechanical cues.
• Decellularization is a key process for preparing ECM bioscaffolds, but traditional methods can adversely affect ECM integrity.
• Developing efficient and gentle decellularization techniques is essential for creating functional tissue engineering scaffolds.

Purpose of the Study:

• To develop and evaluate a closed sonication system for decellularizing ECM bioscaffolds.
• To assess the impact of sonication-assisted decellularization on ECM structure and biomechanical properties.
• To compare the efficacy of the developed system with traditional immersion decellularization methods.

Main Methods:

• A closed sonication system utilizing 170 kHz ultrasound frequency in 0.1% and 2% Sodium Dodecyl Sulphate (SDS) solutions for 10 hours was employed.
• Decellularization efficiency was assessed via histological staining and biochemical assays.
• Biomechanical properties, including stiffness, residual force, and compression, were evaluated using indentation testing.
• In vivo implantation in rats was performed to investigate host tissue response and inflammatory markers.

Main Results:

• Histological staining and biochemical assays confirmed efficient cell removal while preserving the native ECM structure.
• Sonication treatment did not significantly alter the stiffness and residual force of aortic scaffolds.
• A higher SDS concentration (2%) led to a significant decrease in scaffold compression, indicating potential ECM damage.
• In vivo implantation revealed minimal inflammatory responses at 1 and 5 weeks post-implantation.

Conclusions:

• The developed closed sonication system offers an effective method for preparing high-quality ECM bioscaffolds for tissue engineering.
• This novel approach preserves critical ECM structural and biomechanical integrity, outperforming traditional immersion methods.
• The system demonstrates minimal adverse effects and a favorable host tissue response, highlighting its potential for regenerative medicine applications.