A biodegradable and biocompatible regular nanopattern for large-scale selective cell growth

Area of Science:

• Biomaterials Science
• Cell Biology
• Nanotechnology

Background:

• Nanotopographical control of cell behavior is crucial for developing advanced biomaterials.
• Understanding cell-surface interactions at the nanoscale is key to designing biocompatible materials.
• Previous studies have explored nanotopography's effects, but large-area, cell-selective responses require further investigation.

Purpose of the Study:

• To investigate the mechanisms of nanotopographical control over cell behavior using a biodegradable substrate with nanopillars.
• To demonstrate a cell-selective effect of nanotopography on different cell lines.
• To explore the potential of nanotopographical surfaces for applications in vascular replacements.

Main Methods:

• Fabrication of a biodegradable substrate with a regular array of nanopillars using electron-beam lithography and hot embossing.
• Culturing two different cell lines (fibroblasts and endothelial cells) on the fabricated nanopillar surfaces.
• Analyzing cell coverage, proliferation, and spreading on the nanotopographical substrates.

Main Results:

• Striking differences in cell coverage were observed between the two cell lines on the nanopillars.
• The observed effects were topography- and cell-dependent, and not caused by trapped air bubbles.
• Fibroblast proliferation was inhibited, while endothelial cell spreading was enhanced on the nanopatterned surface.
• A strong, large-area, cell-selective effect of the nanotopography was demonstrated for the first time.

Conclusions:

• Nanotopography can induce significant, cell-selective responses, with reduced surface area potentially inhibiting fibroblast growth.
• The enhanced endothelial cell spreading suggests potential for developing inert surfaces that promote rapid in situ endothelialization.
• These findings pave the way for creating permanent vascular replacements with reduced risk of thrombosis and occlusion.