Development, repair and regeneration of the retinal pigment epithelium

Eye
I GriersonG Larkin

Abstract

An overview is presented of the retinal pigment epithelium (RPE) cell in repair and regeneration. Changes in the RPE associated with repair activities have been described as metaplasia. However, evidence is presented to show that RPE cells do not become either fibroblasts or macrophages but merely adopt the appearance of these cell types in pathological conditions. The phenotypic alterations seem to be substrate-related. The fibroblast form predominates on two-dimensional substrates rich in fibronectin and in three-dimensional collagen matrices. The macrophage form seems to be associated with insubstantial or inadequate substrates such as the vitreous, photoreceptor debris and some cell surfaces. In altered circumstances the dedifferentiated RPE can rapidly revert to an epithelioid form. However, the regeneration of an effective RPE mosaic is more difficult and dependent on many factors including the size of the initial lesion, the condition of the basement area, the status of the neuroretina and the existing pathology in the eye. The importance for the regeneration of a normal functioning RPE of the cells being out of the cell cycle, establishing effective junctioning, reorganising their cytoskeleton and having the required ad...Continue Reading

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