Effect of specific surface microstructures on substrate endothelialisation and thrombogenicity: Importance for stent...

Area of Science:

• Biomaterials Science
• Cardiovascular Research
• Surface Engineering

Background:

• Coronary artery disease often requires stent implantation, necessitating dual-antiplatelet therapy (DAPT) to prevent stent thrombosis.
• Current stent designs may prolong the required DAPT duration due to thrombogenicity.
• Hypothesis: Specific stent microstructures can accelerate endothelialization, reducing thrombogenicity and DAPT duration.

Purpose of the Study:

• To investigate the impact of surface microstructures on endothelialization and thrombogenicity.
• To determine if tailored stent topography can improve clinical outcomes in coronary interventions.

Main Methods:

• Lithographic etching of silicon plates with 2-5 μm elevations/hollows, coated with silicon carbide.
• Assessment of human umbilical vein endothelial cell attachment, growth, and migration under static and flow conditions.
• Evaluation of platelet adhesion and thrombogenicity on structured vs. smooth and bare metal surfaces.

Main Results:

• Flat cubic elevations (5 μm) improved endothelial cell attachment and growth compared to smooth surfaces.
• Spiky structures (2 μm) negatively impacted endothelialization and migration.
• Platelet adhesion was reduced on flat elevations and smooth surfaces, but increased on spiky and hollow designs.

Conclusions:

• Surface microstructures significantly influence substrate endothelialization.
• Designing stents with specific topography can accelerate endothelialization and reduce thrombogenicity.
• This approach may enhance the safety profile of coronary interventions by potentially reducing DAPT duration.