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Retinal Pigment Epithelial Cell Loss
- Molecular classification
- Cellular process, Tissue degeneration
01
Overview
Retinal pigment epithelial (RPE) cell loss refers to the reduction in number or function of RPE cells, a monolayer of pigmented cells located between the neural retina and the choroid. These cells are essential for retinal health, supporting photoreceptor survival, phagocytosing shed photoreceptor outer segments (POS), maintaining the blood-retina barrier, and regulating nutrient/waste exchange. Loss or dysfunction of RPE cells is implicated in several degenerative retinal diseases, most notably age-related macular degeneration (AMD), leading to secondary death of overlying photoreceptors and vision loss. Key mechanisms contributing to RPE cell loss include aging, oxidative stress, inflammation, and genetic factors.
- Other names
- RPE cell lossRPE degenerationLoss of Retinal Pigment EpitheliumRPE atrophy
02
Biological functions
Phagocytosis of photoreceptor outer segmentsNutrient transport to photoreceptorsWaste removal from photoreceptorsMaintenance of blood-retina barrierSecretion of growth factorsLight absorption
03
Disease associations
Age-related macular degeneration (AMD)Geographic atrophyRetinitis pigmentosaOther retinopathies
04
Safety considerations
Vision impairmentBlindnessSecondary photoreceptor degeneration
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