Endothelial cell adhesion to vascular prosthetic surfaces.

Area of Science:

• Biomaterials Science
• Vascular Surgery
• Cell Biology

Background:

• Small diameter prosthetic grafts often face challenges with long-term patency.
• Developing non-thrombogenic surfaces is critical for improving vascular graft performance.
• Endothelial cell colonization is key to creating functional, blood-compatible grafts.

Purpose of the Study:

• To evaluate the adhesive properties of human adult endothelial cells on various prosthetic surfaces.
• To determine the ability of endothelial cells to colonize Dacron grafts.
• To identify surface modifications that enhance endothelial cell adhesion for improved graft patency.

Main Methods:

• Human adult endothelial cells were labeled with Indium-oxine for tracking.
• Cell adhesion was tested on Dacron graft surfaces pre-coated with cold insoluble globulin (CIG), gelatin, alginate, or untreated controls.
• Adhesion and retention of cells on grafts were assessed in an in vitro arterial circuit under physiological conditions, including exposure to blood and shear forces.

Main Results:

• Pre-coating with CIG (86.0%) and gelatin (81.6%) significantly enhanced endothelial cell adhesion compared to alginate (57.5%) and controls (48.3%).
• Endothelial cells demonstrated stable adhesion to Dacron grafts after an initial loss, with 73.4% remaining in culture medium and 64.1% in blood after 102 minutes.
• Cells adhered effectively to CIG and gelatin pre-coated surfaces and maintained attachment under shear stress.

Conclusions:

• Cold insoluble globulin (CIG) and gelatin are effective coatings for enhancing human endothelial cell adhesion to Dacron vascular grafts.
• Improved endothelial cell adhesion and retention on modified graft surfaces are vital for achieving long-term patency and reducing thrombogenicity.
• These findings support the use of CIG or gelatin pre-coating as a strategy to improve the performance of small-diameter vascular prostheses.