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Bisretinoid Photodegradation Is Likely Not a Good Thing
Keiko Ueda1, Hye Jin Kim1, Jin Zhao1
1Departments of Ophthalmology, Columbia University Medical Center, New York, NY, USA.
Advances in Experimental Medicine and Biology
|May 4, 2018
Summary
Bisretinoid accumulation in retinal pigment epithelial cells contributes to vision loss. Evidence suggests these compounds degrade from light exposure, causing cumulative retinal damage.
Area of Science:
- Ophthalmology
- Cell Biology
- Photochemistry
Background:
- Retinaldehyde adducts, known as bisretinoids, accumulate in retinal pigment epithelial (RPE) cells as lipofuscin.
- Bisretinoids are associated with inherited and age-related macular degeneration, leading to RPE cell death and vision impairment.
Purpose of the Study:
- To investigate the role of light exposure in bisretinoid accumulation and degradation within the retina.
- To understand the implications of bisretinoid photodegradation on retinal health and function.
Main Methods:
- Comparison of bisretinoid accumulation in albino and black-eyed mice.
- Rearing mice under conditions of constant darkness versus cyclic light exposure.
- Analysis of bisretinoid photodegradation products and their effects on retinal molecules.
Main Results:
- Evidence indicates that bisretinoid fluorophores undergo photodegradation in the eye.
- Photodegradation products of bisretinoids modify and impair cellular and extracellular molecules within the retina.
- These processes contribute to cumulative retinal damage.
Conclusions:
- Bisretinoid photodegradation is a significant factor in retinal damage.
- Understanding bisretinoid photochemistry is crucial for developing therapies for macular degeneration.
- Minimizing light exposure may be a potential strategy to mitigate bisretinoid-induced retinal damage.
