EGF-grafted PDMS surfaces in artificial cornea applications.

Area of Science:

• Biomaterials Science
• Ophthalmology
• Tissue Engineering

Background:

• Artificial cornea design faces challenges with epithelial cell coverage.
• Polydimethylsiloxane (PDMS) is a common material for artificial corneas.
• Enhancing cell adhesion and proliferation is crucial for artificial cornea integration.

Purpose of the Study:

• To modify PDMS surfaces with epidermal growth factor (EGF) to promote corneal epithelial cell growth.
• To investigate the efficacy of covalently bound EGF on PDMS substrates.
• To improve epithelial cell coverage on artificial cornea materials.

Main Methods:

• PDMS surfaces were modified with EGF using allylamine plasma polymerization and a polyethylene glycol (PEG) spacer.
• Surface modification was verified using contact angle and X-ray photoelectron spectroscopy.
• Epidermal growth factor (EGF) immobilization density was quantified using surface plasmon resonance (SPR) and radiolabelling.
• Human corneal epithelial cells were cultured on modified and unmodified surfaces.

Main Results:

• Covalently tethered EGF on PDMS surfaces was confirmed to be biologically active.
• Modified surfaces demonstrated significantly improved corneal epithelial cell coverage compared to controls.
• The density of bound EGF influenced the degree of cell coverage.

Conclusions:

• Surface modification of PDMS with covalently bound EGF effectively promotes corneal epithelial cell coverage.
• This approach offers a promising strategy for improving the performance of artificial corneas.
• Active, surface-bound growth factors can enhance the biocompatibility of implantable devices.