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Large-Scale Purification of Porcine or Bovine Photoreceptor Outer Segments for Phagocytosis Assays on Retinal Pigment Epithelial Cells
Published on: December 12, 2014
Lipofuscin of the retinal pigment epithelium: a review
C J Kennedy1, P E Rakoczy, I J Constable
1Molecular Biology Unit, Lions Eye Institute, Centre for Ophthalmology and Visual Science, University of Western Australia, Nedlands.
Abstract:
Accumulation of lipofuscin is one of the most characteristic features of ageing observed in retinal pigment epithelial (RPE) cells. The lipofuscin found in RPE cells differs from that of other body tissues due to the fact that it is mainly derived from the chemically modified residues of incompletely digested photoreceptor outer segments. It is a heterogeneous material composed of a mixture of lipids, proteins, and different fluorescent compounds, the main fluorophore of which has recently been identified as a derivative of vitamin A. Research interest has variously focussed on the roles of age, light damage, free radicals, antioxidants, visual pigments, retinal locus, lysosomal enzymes, and pigmentation on lipofuscin formation, as well as the effects of lipofuscin on RPE cell function and causation of retinal disease. This article reviews the recent advances in knowledge of the composition, origin, and possible deleterious effects of RPE cell lipofuscin.
Insights
Lipofuscin accumulation in retinal pigment epithelial (RPE) cells is a hallmark of aging. This review covers RPE lipofuscin
Area of Science:
- Ophthalmology
- Cell Biology
- Aging Research
Background:
- Lipofuscin accumulation is a key indicator of aging in retinal pigment epithelial (RPE) cells.
- RPE lipofuscin originates from incompletely digested photoreceptor outer segments, differing from lipofuscin in other tissues.
- It comprises lipids, proteins, and fluorescent compounds, with a vitamin A derivative identified as the primary fluorophore.
Purpose of the Study:
- To review recent advancements in understanding RPE cell lipofuscin.
- To explore the composition, origin, and potential detrimental effects of RPE lipofuscin.
- To synthesize current knowledge on factors influencing lipofuscin formation and its impact on retinal health.
Main Methods:
- Literature review of recent scientific publications.
- Analysis of research focusing on RPE cell lipofuscin.
- Synthesis of findings on lipofuscin composition, formation, and effects.
Main Results:
- Lipofuscin is a heterogeneous mix of lipids, proteins, and fluorescent compounds, primarily derived from photoreceptor outer segments.
- Factors such as age, light exposure, oxidative stress, and genetics influence lipofuscin accumulation.
- Accumulated lipofuscin can impair RPE cell function and contribute to retinal diseases.
Conclusions:
- Recent research has elucidated the complex composition and origin of RPE lipofuscin.
- Understanding lipofuscin's role is crucial for addressing age-related retinal diseases.
- Further investigation into lipofuscin's deleterious effects may lead to therapeutic strategies.
