Platelet inhibition and endothelial cell adhesion on elastin-like polypeptide surface modified materials

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Vascular Engineering

Background:

• Biomaterial blood compatibility is assessed by platelet adhesion and activation.
• Endothelial cell adhesion and nitric oxide synthase (eNOS) expression are key for long-term vascular graft success.
• Surface modification strategies are employed to improve biomaterial performance.

Purpose of the Study:

• To evaluate polyurethane elastomers modified with elastin-like polypeptide 4 (ELP4) for vascular graft applications.
• To assess the in vitro blood compatibility and endothelial cell interactions of ELP4-modified polyurethanes.
• To investigate the effects of ELP4 modification on platelet activation and endothelial cell function.

Main Methods:

• Polyurethane surfaces were modified with ELP4 using fluorinated surface modifiers and elastin cross-linking peptides.
• Reconstituted human blood was used to evaluate platelet adhesion, microparticle formation, and bulk platelet activation.
• Endothelial cell adhesion, retention, actin cytoskeleton organization, and eNOS expression were assessed over one week.

Main Results:

• ELP4-modified polyurethanes exhibited reduced platelet adhesion and bulk platelet activation compared to controls.
• These materials promoted significant endothelial cell adhesion and retention for up to seven days.
• Endothelial cells on ELP4 surfaces showed organized actin cytoskeletons and enhanced eNOS expression.

Conclusions:

• Polyurethane elastomers modified with ELP4 demonstrate improved hemocompatibility and endothelialization potential.
• The covalent binding of ELP4 via fluorinated modifiers offers a promising strategy for developing advanced vascular grafts.
• These findings suggest a viable approach for creating synthetic elastomers with enhanced blood compatibility and endothelial cell integration.