Ultrasound-optimized decellularization and functional modification for enhanced vascular grafts

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Vascular Surgery

Background:

• Vascular grafts are crucial for repairing damaged blood vessels.
• Traditional decellularization methods face challenges in efficiency and preserving matrix integrity.
• Enhancing graft biocompatibility and functionality is key for clinical success.

Purpose of the Study:

• To optimize ultrasound-assisted decellularization for rabbit aortas.
• To improve vascular graft anticoagulant and endothelialization properties.
• To evaluate the efficacy of modified grafts in vascular repair.

Main Methods:

• Ultrasound-assisted decellularization of rabbit aortas.
• Dual-factor surface modification with sodium heparin (HEP) and VEGF165.
• Comparative evaluation of decellularization techniques.
• In vivo animal studies for patency and tissue repair assessment.

Main Results:

• Optimized ultrasound method enhanced decellularization 1.5x, improved matrix integrity to 85%, and reduced residues by 30%.
• HEP and VEGF165 functionalization improved anticoagulation (40%) and endothelialization (68%).
• In vivo studies showed a 93% patency rate and superior tissue repair.

Conclusions:

• Ultrasound optimization and dual-factor functionalization offer a high-performance, low-toxicity strategy for vascular graft development.
• This approach addresses limitations of traditional decellularization methods.
• The modified grafts show significant clinical potential, especially for small-diameter vascular applications.