Cited by 131Retinal Diseases and TreatmentsRetinal Imaging and AnalysisAlzheimer's disease research and treatments

Viewing Ageing Eyes: Diverse Sites of Amyloid Beta Accumulation in the Ageing Mouse Retina and the Up-Regulation of Macrophages

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Hoh Kam, Jaimie, Lenassi, Eva, Jeffery, Glen·2010·PLoS ONE

Abstract

BACKGROUND: Amyloid beta (Aβ) accumulates in the ageing central nervous system and is associated with a number of age-related diseases, including age-related macular degeneration (AMD) in the eye. AMD is characterised by accumulation of extracellular deposits called drusen in which Aβ is a key constituent. Aβ activates the complement cascade and its deposition is associated with activated macrophages. So far, little is known about the quantitative measurements of Aβ accumulation and definitions of its relative sites of ocular deposition in the normal ageing mouse. METHODOLOGY/PRINCIPAL FINDINGS: We have traced Aβ accumulation quantitatively in the ageing mouse retina using immunohistochemistry and Western blot analysis. We reveal that it is not only deposited at Bruch's membrane and along blood vessels, but unexpectedly, it also coats photoreceptor outer segments. While Aβ is present at all sites of deposition from 3 months of age, it increases markedly from 6 months onward. Progressive accumulation of deposits on outer segments was confirmed with scanning electron microscopy, revealing age-related changes in their morphology. Such progress of accumulation of Aβ on photoreceptor outer segments with age was also confirmed in human retinae using immunohistochemistry. We also chart the macrophage response to increases in Aβ showing up-regulation in their numbers using both confocal laser imaging of the eye in vivo followed by in vitro immunostaining. With age macrophages become bloated with cellular debris including Aβ, however, their increasing numbers fail to stop Aβ accumulation. CONCLUSIONS: Increasing Aβ deposition in blood vessels and Bruch's membrane will impact upon retinal perfusion and clearance of cellular waste products from the outer retina, a region of very high metabolic activity. This accumulation of Aβ may contribute to the 30% reduction of photoreceptors found throughout life and the shortening of those that remain. The coating of Aβ on outer segments may also have an impact upon visual function with age.

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Crossref · 10.1371/journal.pone.0013127

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  1. [58]Graymore CN 1969 General aspects of the metabolism of the retina. Davson H In the Eye. 2nd ed New York Academic Press 601 645

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Authors
Hoh Kam, J., Lenassi, E., & Jeffery, G.
Affiliations
  • Ljubljana University Medical Centre (SI)
  • University College London (GB)
Corresponding author
Jeffery, Glen
Venue
PLoS ONE
Published
2010-10-01
Volume
5
Issue
10
Pages
e13127
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1982572468
Cited by
131
References
65
Citations by year
2026: 6 · 2025: 6 · 2024: 5 · 2023: 7 · 2022: 6 · 2021: 8 · 2020: 12 · 2019: 9 · 2018: 7 · 2017: 7 · 2016: 14 · 2015: 10 · 2014: 8 · 2013: 11 · 2012: 12
FWCI
9.07
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
Funders
Rosetrees Trust
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Retinal Imaging and Analysis
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
amyloid-beta, retinal aging, age-related macular degeneration, drusen, photoreceptor outer segments, Bruch's membrane, retinal macrophages, complement activation, mouse retina, photoreceptor degeneration, retinal blood flow
MeSH terms
Aging, Animals, Humans, Immunohistochemistry, Macrophage Activation, Macrophages, Macular Degeneration, Retina, Blotting, Western, Up-Regulation, Amyloid beta-Peptides, Mice

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