Cited by 101Retinal Diseases and TreatmentsNeuroinflammation and Neurodegeneration MechanismsRetinal Imaging and Analysis

7-Ketocholesterol increases retinal microglial migration, activation, and angiogenicity: a potential pathogenic mechanism underlying age-related macular degeneration.

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Indaram, Maanasa, Ma, Wenxin, Zhao, Lian, Fariss, Robert N., Rodriguez, Ignacio R., Wong, Wai T.·2015·Scientific Reports

Abstract

Age-related macular degeneration (AMD) has been associated with both accumulation of lipid and lipid oxidative products, as well as increased neuroinflammatory changes and microglial activation in the outer retina. However, the relationships between these factors are incompletely understood. 7-Ketocholesterol (7KCh) is a cholesterol oxidation product localized to the outer retina with prominent pro-inflammatory effects. To explore the potential relationship between 7KCh and microglial activation, we localized 7KCh and microglia to the outer retina of aged mice and investigated 7KCh effects on retinal microglia in both in vitro and in vivo systems. We found that retinal microglia demonstrated a prominent chemotropism to 7KCh and readily internalized 7KCh. Sublethal concentrations of 7KCh resulted in microglial activation and polarization to a pro-inflammatory M1 state via NLRP3 inflammasome activation. Microglia exposed to 7KCh reduced expression of neurotrophic growth factors but increased expression of angiogenic factors, transitioning to a more neurotoxic and pro-angiogenic phenotype. Finally, subretinal transplantation of 7KCh-exposed microglia promoted choroidal neovascularization (CNV) relative to control microglia in a Matrigel-CNV model. The interaction of retinal microglia with 7KCh in the aged retina may thus underlie how outer retinal lipid accumulation in intermediate AMD results in neuroinflammation that ultimately drives progression towards advanced AMD.

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Authors
Indaram, M., Ma, W., Zhao, L., Fariss, R. N., Rodriguez, I. R., & Wong, W. T.
Affiliations
National Institutes of Health (US)
Corresponding author
Wong, Wai T.
Venue
Scientific Reports
Published
2015-03-16
Volume
5
Issue
1
Pages
9144-9144
ISSN
2045-2322 (ISSN-L)
OpenAlex
W1972548733
Cited by
101
References
81
Citations by year
2026: 6 · 2025: 9 · 2024: 7 · 2023: 10 · 2022: 12 · 2021: 10 · 2020: 9 · 2019: 6 · 2018: 8 · 2017: 5 · 2016: 15 · 2015: 3 · 2014: 1
FWCI
9.94
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Retinal Imaging and Analysis
Keywords
7-ketocholesterol, age-related macular degeneration, retinal microglia, microglial activation, M1 macrophage polarization, NLRP3 inflammasome, neuroinflammation, choroidal neovascularization, angiogenic factors, neurotrophic factors, cholesterol oxidation, outer retina, microglial chemotaxis, intermediate AMD
MeSH terms
CX3C Chemokine Receptor 1, Animals, Cell Survival, Chemotactic Factors, Disease Models, Animal, Gene Expression Regulation, Ketocholesterols, Macular Degeneration, Mice, Transgenic, Neovascularization, Pathologic, Nerve Growth Factors, Retina, Microglia, Receptors, Chemokine, Cell Proliferation, Mice

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