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Updated: Jun 8, 2026

Improved Lipofuscin Models and Quantification of Outer Segment Phagocytosis Capacity in Highly Polarized Human Retinal Pigment Epithelial Cultures

Improved Lipofuscin Models and Quantification of Outer Segment Phagocytosis Capacity in Highly Polarized Human Retinal Pigment Epithelial Cultures

Published on: April 14, 2023

Compositional studies of human RPE lipofuscin.

L S Murdaugh¹, L B Avalle, S Mandal

¹Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL, USA.

Journal of Mass Spectrometry : JMS

|September 23, 2010

Summary

This summary is machine-generated.

Age-related macular degeneration (AMD) involves lipofuscin accumulation, particularly A2E-like compounds, leading to photoreceptor cell death. These hydrophobic A2E derivatives form higher molecular weight products, driving AMD progression.

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Published on: December 12, 2014

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Last Updated: Jun 8, 2026

Improved Lipofuscin Models and Quantification of Outer Segment Phagocytosis Capacity in Highly Polarized Human Retinal Pigment Epithelial Cultures

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Large-Scale Purification of Porcine or Bovine Photoreceptor Outer Segments for Phagocytosis Assays on Retinal Pigment Epithelial Cells

Large-Scale Purification of Porcine or Bovine Photoreceptor Outer Segments for Phagocytosis Assays on Retinal Pigment Epithelial Cells

Published on: December 12, 2014

Area of Science:

Ophthalmology
Biochemistry
Cell Biology

Background:

Age-related macular degeneration (AMD) is a leading cause of vision loss in the elderly.
Lipofuscin accumulation in retinal pigment epithelium (RPE) precedes photoreceptor cell death in AMD.
A2E, a bis-retinoid pyridinium compound, is a major photosensitive component of RPE lipofuscin.

Purpose of the Study:

To characterize the photosensitive components of RPE lipofuscin.
To investigate the formation and properties of A2E and related compounds in AMD.

Main Methods:

Mass spectrometry was used to characterize A2E and related chromophores.
Lipofuscin extracts from human donors were analyzed.
In vitro self-reaction experiments were conducted to study compound formation.

Main Results:

A2E has a mass of 592 Da; related chromophores show fragmentation losses of M ± 190, 174, and/or 150 Da.
RPE lipofuscin contains up to 15 hydrophobic A2E-like components, forming higher molecular weight products (800-900, 970-1080, >1200 m/z).
These higher molecular weight species result from A2E oxidation product self-reactions or reactions with A2E, increasing hydrophobicity.

Conclusions:

A2E and its hydrophobic derivatives are key contributors to RPE lipofuscin.
The formation of higher molecular weight, more hydrophobic A2E derivatives drives their sequestration into granules.
This sequestration may reduce A2E reactivity in vivo, but the overall process contributes to AMD pathogenesis.