Mitochondria-derived reactive oxygen species mediate blue light-induced death of retinal pigment epithelial cells.

TitleMitochondria-derived reactive oxygen species mediate blue light-induced death of retinal pigment epithelial cells.
Publication TypeJournal Article
Year of Publication2004
AuthorsKing, A, Gottlieb, E, Brooks, DG, Murphy, MP, Dunaief, JL
JournalPhotochem Photobiol
Date Published2004 May
KeywordsAging, Antioxidants, Apoptosis, Cell Line, Electron Transport, Humans, Light, Mitochondria, Oxidative Stress, Pigment Epithelium of Eye, Reactive Oxygen Species

Throughout the lifetime of an individual, light is focused onto the retina. The resulting photooxidative stress can cause acute or chronic retinal damage. The pathogenesis of age-related macular degeneration (AMD), the leading cause of legal blindness in the developed world, involves oxidative stress and death of the retinal pigment epithelium (RPE) followed by death of the overlying photoreceptors. Evidence suggests that damage due to exposure to light plays a role in AMD and other age-related eye diseases. In this work a system for light-induced damage and death of the RPE, based on the human ARPE-19 cell line, was used. Induction of mitochondria-derived reactive oxygen species (ROS) is shown to play a critical role in the death of cells exposed to short-wavelength blue light (425 +/- 20 nm). ROS and cell death are blocked either by inhibiting the mitochondrial electron transport chain or by mitochondria-specific antioxidants. These results show that mitochondria are an important source of toxic oxygen radicals in blue light-exposed RPE cells and may indicate new approaches for treating AMD using mitochondria-targeted antioxidants.

Alternate JournalPhotochem. Photobiol.
Citation Key10.1562/le-03-17.1
PubMed ID15191057
Grant ListEY00417 / EY / NEI NIH HHS / United States