Polymer design for corneal epithelial tissue adhesion: pore density.

Area of Science:

• Biomaterials Science
• Ophthalmology
• Tissue Engineering

Background:

• Corneal onlays require porous polymers to support epithelial tissue.
• Previous research identified 100-nm pores as critical for corneal epithelial cell migration and adhesion.
• The impact of pore density on tissue response remained to be investigated.

Purpose of the Study:

• To determine the optimal pore density on polycarbonate surfaces for sustaining corneal epithelial tissue.
• To evaluate the effect of varying pore densities on epithelial stratification and adhesion structure formation.

Main Methods:

• Corneal epithelial tissue was cultured for 21 days on polycarbonate with varying pore densities (0.27% to 14.4%).
• Histology was used to assess epithelial structure.
• Electron microscopy quantified the formation of basal lamina and hemidesmosomes at the tissue-polymer interface.

Main Results:

• Epithelial tissue stratified and formed adhesive structures on surfaces with pore densities from 0.52% to 14.4%.
• Nonporous surfaces and surfaces with very low pore density (0.27%) did not support sustained tissue growth.
• A maximum of 14.4% surface porosity with 100-nm pores is effective for epithelial tissue maintenance.

Conclusions:

• Polycarbonate surfaces with 100-nm pore densities between 0.52% and 14.4% can successfully maintain corneal epithelial tissue.
• These findings provide critical design parameters for developing advanced implantable contact lenses and corneal onlays.
• Optimized pore density is essential for achieving functional integration of corneal epithelial tissue with implantable devices.