Enhanced cellular mobility guided by TiO2 nanotube surfaces.

Area of Science:

• Biomaterials Science
• Cell Biology
• Nanotechnology

Background:

• Endothelialization is critical for vascular stent success.
• Flat titanium surfaces offer limited cues for endothelial cell response.
• Nanostructured surfaces present an opportunity to improve cell-material interactions.

Purpose of the Study:

• To investigate the in vitro endothelial cell response on nanostructured TiO2 nanotubes versus flat Ti.
• To evaluate the impact of nanotopography on cell migration, cytoskeletal organization, and vascular tone.
• To assess the potential of TiO2 nanotubes for vascular stent modification.

Main Methods:

• Primary bovine aortic endothelial cells (BAECs) cultured on flat Ti and TiO2 nanotube surfaces.
• Microscopy to observe cell morphology, actin cytoskeleton, and focal adhesions.
• NOx and endothelin-1 functional assays to assess cellular state.

Main Results:

• TiO2 nanotubes facilitated enhanced cell probing, sensing, and migration.
• Organized actin filaments, lamellipodia, and locomotive morphologies were observed on nanotubes.
• Nanotubes promoted ready formation and disassembly of focal adhesions for cell advancement.
• Functional assays confirmed an up-regulated antithrombic cellular state on nanotubes.
• Enhanced endothelial response was observed on TiO2 nanotubes compared to flat Ti.

Conclusions:

• Nanostructured TiO2 nanotubes significantly improve endothelial cell response, including migration and cytoskeletal organization.
• The nanotopography promotes an antithrombic state, beneficial for vascular health.
• TiO2 nanotubes show promise for modifying vascular stent surfaces to enhance endothelialization and repair.