Crosslinked urethane doped polyester biphasic scaffolds: Potential for in vivo vascular tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• In vivo tissue engineering requires mechanically robust scaffolds for immediate implantation.
• Vascular grafts need matching mechanical properties to native vessels to prevent graft failure.
• Developing strong, elastic, and biodegradable polymers remains a challenge.

Purpose of the Study:

• To evaluate the mechanical properties of novel crosslinked urethane-doped polyesters (CUPE) scaffolds.
• To assess the hemocompatibility and inflammatory potential of CUPE for vascular graft applications.
• To determine CUPE's suitability for immediate implantation in in vivo tissue engineering.

Main Methods:

• Synthesized biodegradable crosslinked urethane-doped polyesters (CUPE).
• Evaluated tensile strength, burst pressure, and suture retention of CUPE biphasic scaffolds.
• Assessed CUPE hemocompatibility through leukocyte activation, whole blood clotting, and hemolytic assays.

Main Results:

• CUPE scaffolds exhibited significantly higher tensile strength (5.02 ± 0.70 MPa) than native vessels (1.43 ± 0.60 MPa).
• Tunable burst pressure (1500-2600 mmHg) and adequate suture retention (2.45 ± 0.23 N) were observed.
• CUPE demonstrated comparable leukocyte activation and clotting kinetics to PLLA, with lower inflammatory cytokine release and no hemolysis.

Conclusions:

• CUPE biphasic scaffolds possess superior mechanical properties suitable for immediate implantation.
• CUPE exhibits favorable hemocompatibility and reduced inflammatory potential compared to PLLA.
• CUPE is a promising biodegradable material for in vivo vascular tissue engineering.