Syndecan-4 Functionalization Reduces the Thrombogenicity of Engineered Vascular Biomaterials

Area of Science:

• Biomaterials Science
• Vascular Biology
• Regenerative Medicine

Background:

• Blood-biomaterial compatibility is critical for endovascular tissue repair, requiring vessel patency and endothelium formation.
• A composite biomaterial (PFC) from poly (glycerol sebacate), silk fibroin, and collagen was developed.
• Syndecan-4 (SYN4) functionalization was investigated to enhance hemocompatibility via heparan sulfate action.

Purpose of the Study:

• To evaluate the hemocompatibility of PFC_SYN4 compared to non-functionalized PFC, collagen, ePTFE, and bovine pericardial patch (BPV).
• To assess the impact of syndecan-4 functionalization on platelet activation, complement activation, and whole blood clotting times.

Main Methods:

• Ultrastructural analysis of platelet activation.
• Quantitative assessment of platelet adhesion.
• Measurement of complement activation levels.
• Whole blood clotting time assays.

Main Results:

• PFC_SYN4 showed reduced platelet activation and degranulation compared to collagen.
• Platelet adhesion was significantly lower on PFC_SYN4 (31% less than PFC, 44% less than collagen).
• PFC_SYN4 exhibited reduced complement activation and lower thrombogenicity than PFC, collagen, and BPV.

Conclusions:

• Syndecan-4 functionalization of PFC biomaterials significantly improves hemocompatibility.
• PFC_SYN4 offers a promising solution for developing reduced thrombogenic blood-contacting surfaces.
• This approach holds potential for advancing tissue repair and endovascular device applications.