Oxidative stress pathways in retinal pigment epithelium

The retinal pigment epithelium (RPE) is a monolayer of pigmented cells situated between the neurosensory retina and the choroid, performing vital functions such as nutrient transport, phagocytosis of photoreceptor outer segments, and light absorption (Source: NIH/NEI). Oxidative stress pathways in the RPE involve the generation of reactive oxygen species (ROS) from mitochondrial respiration and photo-oxidation, which are normally neutralized by antioxidant systems like the Nrf2/ARE signaling pathway and enzymes such as superoxide dismutase (SOD) and glutathione peroxidase (Source: PubMed - PMID: 28822231). Chronic oxidative stress leads to RPE dysfunction, characterized by lipid peroxidation, protein carbonylation, and mitochondrial DNA damage, which are primary drivers of age-related macular degeneration (AMD) and other retinopathies (Source: Journal of Clinical Medicine - PMID: 31546645). Therapeutic interventions targeting these pathways include the use of carotenoids (lutein/zeaxanthin) and Nrf2 activators to bolster the RPE's resilience against oxidative insults (Source: StatPearls - Macular Degeneration).

Other names

Retinal pigment epithelium oxidative stressRPE redox homeostasisPhotoreceptor-RPE oxidative signalingOxidative damage in RPE

Modulation of reactive oxygen species (ROS) levels through direct scavenging, induction of endogenous antioxidant enzymes via the Nrf2/ARE pathway, or stabilization of mitochondrial function to prevent electron leakage.