Cited by 62Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Effects of APOE Genotype on Brain Proteomic Network and Cell Type Changes in Alzheimer's Disease

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Dai, Jingting, Johnson, Erik C. B., Dammer, Eric B., Duong, Duc M., Gearing, Marla, Lah, James J., Levey, Allan I., Wingo, Thomas S. +1 more·2018·Frontiers in Molecular Neuroscience

Abstract

Polymorphic alleles in the apolipoprotein E (APOE) gene are the main genetic determinants of late-onset Alzheimer’s disease (AD) risk. Individuals carrying the APOE E4 allele are at increased risk to develop AD compared to those carrying the more common E3 allele, whereas those carrying the E2 allele are at decreased risk for developing AD. How ApoE isoforms influence risk for AD remains unclear. To help fill this gap in knowledge, we performed a comparative unbiased mass spectrometry-based proteomic analysis of post-mortem brain cortical tissues from pathologically-defined AD or control cases of different APOE genotypes. Control cases (n=10) were homozygous for the common E3 allele, whereas AD cases (n=24) were equally distributed among E2/3, E3/3, and E4/4 genotypes. We used differential protein expression and co-expression analytical approaches to assess how changes in the brain proteome are related to APOE genotype. We observed similar levels of amyloid-β, but reduced levels of neurofibrillary tau, in E2/3 brains compared to E3/3 and E4/4 AD brains. Weighted co-expression network analysis revealed 33 modules of co-expressed proteins, 12 of which were significantly different by APOE genotype in AD. The modules that were significantly different by APOE genotype were associated with synaptic transmission and inflammation, among other biological processes. Deconvolution and analysis of brain cell type changes revealed that the E2 allele suppressed homeostatic and disease-associated cell type changes in astrocytes, microglia, oligodendroglia, and endothelia. The E2 allele-specific effect on brain cell type changes was validated in a separate cohort of 130 brains. Our systems-level proteomic analyses of AD brain reveal alterations in the brain proteome and brain cell types associated with allelic variants in APOE, and suggest further areas for investigation into the upstream mechanisms that drive ApoE-associated risk for AD.

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  • mRNA translation is upregulated in the brains of APOE2 carriers relative to those of APOE3 homozygotes and APOE4 carriers, based on examination of previously published transcriptomic and proteomic Alzheimer's datasets.

    “Supporting the idea that our findings may have broader disease implications, our examination of previously published transcriptomic and proteomic Alzheimer’s datasets revealed that mRNA translation is a pathway that is upregulated in the brains of APOE2 carriers relative to those of APOE3 homozygotes and APOE4 carriers (41,42).”
  • ~35% of proteins upregulated in E4/4 AD compared to E3/3 AD brains overlapped with proteins enriched on E4 LDs.

    “~35 % of proteins upregulated in E4/4 AD compared to E3/3 AD brains (Dai et al., 2018) overlapped with proteins enriched on E4 LDs.”
  • Nearly a dozen network-based analyses of the AD proteome have been performed in the human brain, including the dorsolateral prefrontal cortex, temporal cortex, and other cortical regions heavily affected in AD.

    “Nearly a dozen informative network-based analyses of the AD proteome have been performed in the human brain [62–64, 74, 78, 96, 104–108], including the dorsolateral prefrontal cortex (DLPFC), temporal cortex, and other cortical regions heavily affected in AD.”
  • Dai et al. observed the APOEε2 effect on oligodendrocyte and other cell type markers in a separate network proteome of the AD brain.

    “Dai et al. also observed this APOEε2 effect on oligodendrocyte and other cell type markers in a separate network proteome of the AD brain [104].”

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Authors
Dai, J., Johnson, E. C. B., Dammer, E. B., Duong, D. M., Gearing, M., Lah, J. J., Levey, A. I., Wingo, T. S., & Seyfried, N. T.
Affiliations
  • Central South University (CN)
  • Emory University (US)
Corresponding author
  • Johnson, Erik C. B.
  • Seyfried, Nicholas T.
Venue
Frontiers in Molecular Neuroscience
Published
2018-12-18
Volume
11
Pages
454-454
ISSN
1662-5099 (ISSN-L)
OpenAlex
W2905281204
Cited by
62
References
61
Citations by year
2026: 6 · 2025: 4 · 2024: 8 · 2023: 13 · 2022: 5 · 2021: 10 · 2020: 13 · 2019: 3
FWCI
4.46
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Molecular Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • U.S. Department of Veterans Affairs (IK2 BX001820)
  • Michael J. Fox Foundation for Parkinson's Research (05-901, 211002, 11060, P30 AG19610)
  • Alzheimer's Association (P50 AG025688, 11060)
  • Emory University (R01AG061800, P50AG025688, AG025688, P30NS055077)
  • Arizona Department of Health Services (P30 AG19610, P50 AG025688, 05-901, 211002, Contract 211002)
  • Weston Brain Institute (11060)
  • Arizona Biomedical Research Commission (P30 AG19610, 05–901, 211002)
  • Alzheimer's Disease Research Center, Emory University (P50 AG025688, AG025688)
  • National Institute on Aging (211002, P30-AG-19610, R01AG056533, AG 025688, AG-19610, R01AG057911, P30AG019610, U01AG046161, 05-901, AG056533, P50AG025688, R01AG053960, R01AG061800)
  • National Institute of Neurological Disorders and Stroke (211002, P30NS055077, 05-901, P30 AG19610)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, APOE genotype, apolipoprotein E, APOE e2 allele, APOE ε4, brain proteome, astrocytes, microglia, oligodendrocytes, amyloid-beta, tau protein, synaptic transmission, neuroinflammation, cortical tissue

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