Cited by 26Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsAdipokines, Inflammation, and Metabolic Diseases

High-fat diet increases gliosis and immediate early gene expression in APOE3 mice, but not APOE4 mice.

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Jones, Nahdia S., Watson, Katarina Q., Rebeck, G. William·2021·Journal of Neuroinflammation

Abstract

Background: APOE4 is the strongest genetic risk factor for Alzheimer’s disease (AD), and obesity is a strong environmental risk factor for AD. These factors result in multiple central nervous system (CNS) disturbances and significantly increase chances of AD. Since over 20% of the US population carry the APOE4 allele and over 40% are obese, it is important to understand how these risk factors interact to affect neurons and glia in the CNS. Methods: We fed male and female APOE3 and APOE4 knock-in mice a high-fat diet (HFD-45% kcal fat) or a "control" diet (CD-10% kcal fat) for 12 weeks beginning at 6 months of age. At the end of the 12 weeks, brains were collected and analyzed for gliosis, neuroinflammatory genes, and neuronal integrity. Results: APOE3 mice on HFD, but not APOE4 mice, experienced increases in gliosis as measured by GFAP and Iba1 immunostaining. APOE4 mice on HFD showed a stronger increase in the expression of Adora2a than APOE3 mice. Finally, APOE 3 mice on HFD, but not APOE4 mice, also showed increased neuronal expression of immediate early genes cFos and Arc. Conclusions: These findings demonstrate that APOE genotype and obesity interact in their effects on important processes particularly related to inflammation and neuronal plasticity in the CNS. During the early stages of obesity, the APOE3 genotype modulates a response to HFD while the APOE4 genotype does not. This supports a model where early dysregulation of inflammation in APOE4 brains could predispose to CNS damages from various insults and later result in the increased CNS damage normally associated with the APOE4 genotype.

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  • Early dysregulation of inflammation in APOE4 brains could predispose to CNS damage from various insults, including diet, and later results in increased CNS damage normally associated with the APOE4 genotype.

    “A second study concluded that early dysregulation of inflammation in APOE4 brains could predispose to CNS damage from various insults, including diet, and later results in the increased CNS damage normally associated with the APOE4 genotype (Jones et al., 2021).”

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  1. [34]Moser VA, Pike CJ (2017) Obesity accelerates Alzheimer-related pathology in APOE4 but not APOE3 mice. eNeuro 4. PMC5469027 28612048

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Authors
Jones, N. S., Watson, K. Q., & Rebeck, G. W.
Affiliations
Georgetown University (US)
Corresponding author
Rebeck, G. William
Venue
Journal of Neuroinflammation
Published
2021-09-18
Volume
18
Issue
1
Pages
214-214
ISSN
1742-2094 (ISSN-L)
OpenAlex
W3200511728
Cited by
26
References
59
Citations by year
2026: 2 · 2025: 3 · 2024: 5 · 2023: 11 · 2022: 5
FWCI
2.10
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institutes of Health (R21 AG074139, R01 NS100704, F99 NS119746-01)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
APOE ε4, APOE3, high-fat diet, obesity, Alzheimer's disease risk, gliosis, neuroinflammation, immediate early genes, c-fos, Arc, adenosine A2A receptor, glial fibrillary acidic protein, Iba1, neuroplasticity, gene-diet interaction
MeSH terms
Animals, Brain, Female, Gliosis, Male, Mice, Inbred C57BL, Mice, Transgenic, Gene Expression, Genes, Immediate-Early, Mice, Apolipoprotein E3, Apolipoprotein E4, Gene Knock-In Techniques, Diet, High-Fat

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