Cited by 92Retinal Diseases and TreatmentsRetinal Development and DisordersNeuroinflammation and Neurodegeneration Mechanisms

A2E accumulation influences retinal microglial activation and complement regulation

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Ma, Wenxin, Coon, Steven, Zhao, Lian, Fariss, Robert N., Wong, Wai T.·2013·Neurobiology of Aging

Abstract

Age-related macular degeneration is an outer retinal disease that involves aging and immune dysfunction. In the aging retina, microglia aggregate in the outer retina and acquire intracellular autofluorescent lipofuscin deposits. In this study, we investigated whether accumulation of A2E, a key bisretinoid constituent of ocular lipofuscin, alters the physiology of retinal microglia in pathologically relevant ways. Our findings show that sublethal accumulations of intracellular A2E in cultured retinal microglia increased microglial activation and decreased microglial neuroprotection of photoreceptors. Increased A2E accumulation also lowered microglial expression of chemokine receptors and suppressed microglial chemotaxis, suggesting that lipofuscin accumulation may potentiate subretinal microglial accumulation. Significantly, A2E accumulation altered microglial complement regulation by increasing complement factor B and decreasing complement factor H expression, favoring increased complement activation and deposition in the outer retina. Taken together, our findings highlight the role of microglia in the local control of complement activation in the retina and present the age-related accumulation of ocular lipofuscin in subretinal microglia as a cellular mechanism capable of driving outer retinal immune dysregulation in age-related macular degeneration pathogenesis.

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Crossref · 10.1016/j.neurobiolaging.2012.06.010

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  • Aged microglia tend to accumulate lipofuscin, which has been associated with dysfunction and inflammation.

    “Aged microglia also tend to accumulate lipofuscin [52–54], aggregations of highly oxidized proteins cross-linked with sugars and lipids [55], which have been associated with dysfunction and inflammation [56,57].”

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Authors
Ma, W., Coon, S., Zhao, L., Fariss, R. N., & Wong, W. T.
Affiliations
National Institutes of Health (US)
Corresponding author
Wong, Wai T.
Venue
Neurobiology of Aging
Publisher
Elsevier BV
Published
2013-03
Volume
34
Issue
3
Pages
943-960
ISSN
0197-4580 (ISSN-L)
OpenAlex
W2063005088
Cited by
92
References
87
Citations by year
2026: 1 · 2025: 1 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 9 · 2020: 5 · 2019: 8 · 2018: 8 · 2017: 4 · 2016: 10 · 2015: 12 · 2014: 12 · 2013: 9 · 2012: 2
FWCI
10.48
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Aging (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
American Health Assistance Foundation
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
A2E, bisretinoids, lipofuscin, retinal microglia, microglial activation, age-related macular degeneration, complement regulation, factor B, complement factor H, complement activation, chemokine receptors, microglial chemotaxis, outer retina, retinal aging, immune dysregulation
MeSH terms
CX3C Chemokine Receptor 1, Aged, Aged, 80 and over, Aging, Animals, Cell Migration Inhibition, Cells, Cultured, Complement Activation, Humans, Lipofuscin, Macular Degeneration, Mice, Transgenic, Middle Aged, Complement Factor B, Pyridinium Compounds, Retina, Retinoids, Complement Factor H, Microglia, Receptors, Chemokine, Mice

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