Substrate-enzyme affinity-based surface modification strategy for endothelial cell-specific binding under shear...

Area of Science:

• Biomaterials Engineering
• Cell Biology
• Vascular Biology

Background:

• Endothelial cell (EC) monolayers enhance graft hemocompatibility.
• Endothelin converting enzyme-1 (ECE-1) on ECs interacts with big Endothelin-1 (bigET-1).
• Cell-specific binding surfaces are crucial for biomedical applications.

Purpose of the Study:

• To engineer an EC-specific binding surface using substrate-enzyme affinity (SEA).
• To investigate the preferential binding of ECs over vascular smooth muscle cells (VSMCs) to immobilized bigET-1.
• To assess the potential of this strategy for cardiovascular implant development.

Main Methods:

• Chemically immobilized synthetic bigET-1 onto a glass substrate using self-assembled monolayers (SAMs).
• Quantified ECE-1 expression and bigET-1 processing by ECs and VSMCs.
• Assessed cell binding under dynamic shear conditions and compared with collagen-coated surfaces.

Main Results:

• ECs express significantly higher ECE-1 and process more synthetic bigET-1 than VSMCs.
• The synthetic bigET-1-immobilized surface showed approximately 3-fold higher EC binding than VSMCs under shear stress.
• EC-specific binding was superior to that of a collagen-coated surface.

Conclusions:

• Substrate-enzyme affinity (SEA) is an effective strategy for engineering cell-specific binding surfaces.
• This approach promotes rapid endothelialization, potentially improving cardiovascular implant patency.
• The novel strategy offers a new route for creating hemocompatible vascular grafts.