Cited by 193Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsNeurological Disease Mechanisms and Treatments

Human APOE4 increases microglia reactivity at Aβ plaques in a mouse model of Aβ deposition

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Rodriguez, Gustavo A, Tai, Leon M, LaDu, Mary Jo, Rebeck, G William·2014·Journal of Neuroinflammation

Abstract

BACKGROUND: Having the apolipoprotein E4 (APOE-ϵ4) allele is the strongest genetic risk factor for the development of Alzheimer's disease (AD). Accumulation of amyloid beta (Aβ) in the brain is influenced by APOE genotype. Transgenic mice co-expressing five familial AD mutations (5xFAD) in the presence of human APOE alleles (ϵ2, ϵ3 or ϵ4) exhibit APOE genotype-specific differences in early Aβ accumulation, suggesting an interaction between APOE and AD pathology. Whether APOE genotype affects Aβ-plaque-associated neuroinflammation remains unclear. In the current study, we address the role of APOE genotype on Aβ-associated microglial reactivity in the EFAD transgenic mouse model. METHODS: We analyzed Aβ-induced glial activation in the brains of 6-month-old EFAD transgenic mice (E2FAD, E3FAD and E4FAD). Region-specific morphological profiles of Aβ plaques in EFAD brain sections were compared using immunofluorescence staining. We then determined the degree of glial activation in sites of Aβ deposition while comparing levels of the inflammatory cytokine Interleukin-1β (IL-1β) by ELISA. Finally, we quantified parameters of Aβ-associated microglial reactivity using double-stained EFAD brain sections. RESULTS: Characterization of Aβ plaques revealed there were larger and more intensely stained plaques in E4FAD mice relative to E2FAD and E3FAD mice. E4FAD mice also had a greater percentage of compact plaques in the subiculum than E3FAD mice. Reactive microglia and dystrophic astrocytes were prominent in EFAD brains, and primarily localized to two sites of significant Aβ deposition: the subiculum and deep layers of the cortex. Cortical levels of IL-1β were nearly twofold greater in E4FAD mice relative to E3FAD mice. To control for differences in levels of Aβ in the different EFAD mice, we analyzed the microglia within domains of specific Aβ deposits. Morphometric analyses revealed increased measures of microglial reactivity in E4FAD mice, including greater dystrophy, increased fluorescence intensity and a higher density of reactive cells surrounding cortical plaques, than in E3FAD mice. CONCLUSIONS: In addition to altering morphological profiles of Aβ deposition, APOE genotype influences Aβ-induced glial activation in the adult EFAD cortex. These data support a role for APOE in modulating Aβ-induced neuroinflammatory responses in AD progression, and support the use of EFAD mice as a suitable model for mechanistic studies of Aβ-associated neuroinflammation.

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Crossref · 10.1186/1742-2094-11-111

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  • APOE4 has been associated with altered plaque morphology, greater fibrillar amyloid deposition, and enhanced plaque-associated microglial reactivity.

    “APOE4 has been associated with altered plaque morphology, greater fi brillar amyloid deposition, and enhanced plaque-associated microglialreactivity”

    From APOE2 attenuates APOE4-associated amyloid pathology and related toxicity in a mouse model of Alzheimer’s disease (2026) · cites this paper as [51]

    The Results report altered plaque morphology in E4FAD mice and increased plaque-associated microglial reactivity in deep cortical layers; they found no genotype effect on microglial reactivity in the subiculum. The Discussion says this study used a pan-specific Aβ antibody, whereas a previous study used a stain for amyloid fibrils. This paper does not establish greater fibrillar amyloid deposition specifically. (LLM, conf=0.88)

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  • ApoE4-expressing 5xFAD mice display higher levels of glial activation and IL-1β as well as larger and more intensely stained Aβ plaques than apoE3-expressing 5xFAD mice.

    “apoE4-expressing 5xFAD mice display higher levels of glial activation and the proinflammatory cytokine interleukin-1β (IL-1β) as well as larger and more intensely stained Aβ plaques than apoE3-expressing 5xFAD mice”
  • Other studies have reported that APOE2 expression is associated with similar or even higher plaque load than APOE3.

    “Nevertheless other studies have also reported that APOE2 expression is associated with similar or even higher plaque load than APOE3 (Rodriguez et al, 2014; Youmans et al, 2012; Bales et al, 2009; Dodart et al, 2005).”

    From APOE from astrocytes restores Alzheimer’s Aβ-pathology and DAM-like responses in APOE deficient microglia (2024) · cites this paper as Rodriguez et al, 2014

    The Results section on plaque morphology (page unavailable) reports a higher percentage of diffuse plaques in E2FAD than E3FAD mice, but percentages of plaque types do not establish total plaque load. Searches for E2FAD–E3FAD plaque burden and total Aβ load found no comparison showing that APOE2 has similar or higher plaque load than APOE3. (LLM, conf=0.76)

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Authors
Rodriguez, G. A., Tai, L. M., LaDu, M. J., & Rebeck, G. W.
Affiliations
  • Georgetown University Medical Center (US)
  • University of Illinois Chicago (US)
Corresponding author
Rebeck, G William
Venue
Journal of Neuroinflammation
Published
2014-06-19
Volume
11
Issue
1
Pages
111-111
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2107281222
Cited by
193
References
67
Citations by year
2026: 11 · 2025: 15 · 2024: 19 · 2023: 20 · 2022: 28 · 2021: 19 · 2020: 21 · 2019: 13 · 2018: 14 · 2017: 12 · 2016: 5 · 2015: 15 · 2014: 1
FWCI
7.33
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (UL1TR000050)
  • University of Illinois at Urbana-Champaign (UL1TR000050)
  • University of Illinois at Chicago (UL1TR000050)
  • National Institute on Aging (P01AG030128, R01AG035379, R01 AG035379-S)
  • National Institute of Neurological Disorders and Stroke (T32 NS041218-S1, T32NS041218)
  • National Center for Advancing Translational Sciences
  • Office of the Vice Chancellor for Research, University of Illinois at Chicago
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
APOE ε4, apolipoprotein E, Alzheimer's disease, amyloid plaques, microglial activation, neuroinflammation, 5xFAD mice, IL-1β, APOE genotype, plaque morphology, subiculum, glial activation, APOE ε3
MeSH terms
Alzheimer Disease, Animals, Cerebral Cortex, Disease Models, Animal, Gene Expression Regulation, Humans, Mice, Transgenic, Mutation, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Microglia, Microscopy, Confocal, Mice, Apolipoprotein E4, Interleukin-1beta, Presenilin-1, Plaque, Amyloid

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