Endothelialization of Rationally Microtextured Surfaces with Minimal Cell Seeding Under Flow

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Cell Biology

Background:

• Endothelialization of cardiovascular devices is crucial for long-term integration by preventing blood-material contact.
• Limited endothelial cell availability in patients necessitates strategies for efficient surface coverage.
• Stable endothelialization depends on endothelial cells, shear stress, and substrate topography.

Purpose of the Study:

• To develop and validate a novel surface engineering strategy for rapid and stable endothelialization of cardiovascular devices.
• To minimize the number of endothelial cells required for prompt and complete surface coverage.
• To enhance the integration of cardiovascular implants through improved endothelial cell function.

Main Methods:

• Development of engineered surface textures combined with confined islands of seeded endothelial cells.
• Observation of cell migration and merging under physiological flow conditions after confinement release.
• Analysis of endothelial cell-to-substrate and cell-to-cell interactions on textured surfaces.

Main Results:

• Confined endothelial cell islands migrated and merged on engineered textures to form a confluent endothelium.
• Surface textures stabilized cell adhesions and junctions, supporting endothelialization.
• Approximately 50% initial surface coverage on textured surfaces halved the time to full endothelialization compared to untextured surfaces.

Conclusions:

• The novel strategy effectively promotes rapid and stable endothelialization of cardiovascular device surfaces.
• This approach addresses the challenge of limited cell availability by enhancing seeding efficiency.
• The method shows significant potential for improving the long-term performance and integration of cardiovascular implants.