Related Experiment Videos
Lipofuscin and macular degeneration
1Department of Nutritional Sciences and Toxicology, University of California, Berkeley, CA 94720-3104, USA.
Nutrition Reviews
|November 8, 2003
Summary
Aging causes lipofuscin accumulation in the retina due to the visual cycle. The drug isotretinoin may prevent macular degeneration by slowing this cycle and reducing toxic A2E buildup.
Area of Science:
- Ophthalmology
- Cell Biology
- Biochemistry
Background:
- Lipofuscin, an autofluorescent pigment, accumulates in the retina with aging.
- This accumulation is linked to the visual cycle, specifically the condensation of all-trans-retinal and phosphatidylethanolamine.
- The resulting A2E (a pyridinium bisretinoid) is toxic to retinal pigment epithelium (RPE) cells.
Purpose of the Study:
- To investigate the role of A2E accumulation in age-related macular degeneration and Stargardt disease.
- To explore the potential therapeutic effect of isotretinoin on A2E accumulation and related retinal diseases.
Main Methods:
- The study focuses on the biochemical pathway leading to A2E formation.
- Animal models (mice) were used to test the effect of isotretinoin.
Main Results:
- Isotretinoin (13-cis-retinoic acid) was found to prevent A2E accumulation in mice.
- This prevention is achieved by slowing down the visual cycle.
Conclusions:
- A2E accumulation is a key factor in RPE cell apoptosis, contributing to macular degeneration.
- Isotretinoin shows potential as a preventative treatment for macular degeneration by modulating the visual cycle.