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A model for the preliminary biological screening of potential keratoprosthetic biomaterials

Paper ID Volume ID Publish Year Pages File Format Full-Text
13545 880 2003 11 PDF Available
Title
A model for the preliminary biological screening of potential keratoprosthetic biomaterials
Abstract

A series of in vitro screening assays for the preliminary selection of biomaterials for use in the fabrication of artificial corneas (keratoprostheses) (KPros) have been investigated. These screening assays assessed the initial binding of inflammatory and cell adhesive proteins, activation of inflammatory proteins, adhesion of keratocytes, epithelial cells and macrophages and the production of inflammatory cytokines by keratocytes contacting biomaterials. Central optic biomaterials were selected on the basis of low-inflammatory and cell adhesion potential. Peripheral skirt materials were selected on the basis of low-inflammatory potential but good cell adhesion to anchor the implant within the host cornea. Green fluorescent protein (GFP) gene transfer was used in a novel context to investigate cell invasion in the absence of external staining techniques. Confocal laser scanning microscopy and scanning electron microscopy were used to investigate GFP positive keratocyte invasion of porous materials. The results of in vitro assays were compared to a corneal organ culture system in which the biomaterials were assessed within a stromal environment. A range of polyurethane-based interpenetrating polymers with a range of water contents were screened. All materials showed low-inflammatory potential. A reduction in biomaterial water content induced an increase in complement C3 and fibronectin binding and in cell adhesion to materials, whilst differences in co-monomer formulation had little impact. The screening methods used in the current study provide a suitable preliminary assessment regime for the in vitro evaluation of potential KPro materials.

Keywords
Keratoprosthesis; Cornea; Preliminary screening model; GFP
First Page Preview
A model for the preliminary biological screening of potential keratoprosthetic biomaterials
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 24, Issue 26, November 2003, Pages 4729–4739
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering