Surface-modified silicone foils for intraocular implantation.

Area of Science:

• Biomaterials Science
• Ophthalmology
• Cell Biology

Background:

• Intraocular implants made of silicone materials can face complications due to cell migration and attachment.
• Polydimethylsiloxane (PDMS) foils were modified with isocyanate-terminated, star-shaped poly(ethylene glycol-stat-propylene glycol) (NCO-sP(EO-stat-PO)) and heparin to inhibit cell adhesion.

Purpose of the Study:

• To evaluate the biocompatibility and cell interaction of NCO-sP(EO-stat-PO) coated PDMS foils, with and without heparin, for potential use in ocular implants.
• To determine if the coatings reduce cell attachment and migration without compromising cell viability.

Main Methods:

• Mouse fibroblasts (L929) were cultured on uncoated NCO-sP(EO-stat-PO) or heparin-NCO-sP(EO-stat-PO) coated foils, with polyvinylchloride (PVC) and biomembranes as controls.
• Cell viability, adhesion, morphology, density, proliferation (BrdU test), and activity (WST-1 test) were assessed after 24 hours using fluorescence microscopy and staining.

Main Results:

• Fibroblast viability was high on all tested foils except the toxic PVC control.
• NCO-sP(EO-stat-PO) coating significantly reduced cell activity.
• Heparin-loaded coatings maintained cell viability, reduced cell density, and showed proliferation and activity similar to negative controls.
• NCO-sP(EO-stat-PO) coated, heparin-loaded foils demonstrated high biocompatibility and reduced cell adhesion.

Conclusions:

• Both NCO-sP(EO-stat-PO)-coated foils, with and without heparin, appear suitable for implantation due to reduced cell migration and attachment.
• These materials may lead to fewer complications associated with intraocular implants.
• Further studies on intraocular implantation are recommended, particularly for the NCO-sP(EO-stat-PO)-coated foils.