Cited by 277Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Human APOE Isoform-Dependent Effects on Brain β-Amyloid Levels in PDAPP Transgenic Mice

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Bales, Kelly R., Liu, Feng, Wu, Su, Lin, Suizhen, Koger, Deanna, DeLong, Cynthia, Hansen, Jeffrey C., Sullivan, Patrick M. +1 more·2009·The Journal of Neuroscience

Abstract

To investigate the role of human apolipoprotein E (apoE) on Abeta deposition in vivo, we crossed PDAPP mice lacking mouse Apoe to targeted replacement mice expressing human apoE (PDAPP/TRE2, PDAPP/TRE3, or PDAPP/TRE4). We then measured the levels of apoE protein and Abeta peptides in plasma, CSF, and brain homogenates in these mice at different ages. We also quantified the amount of brain Abeta and amyloid burden in 18-month-old mice. In young PDAPP/TRE4 mice that were analyzed at an age before brain Abeta deposition, we observed a significant decrease in the levels of apoE in CSF and brain when compared with age-matched mice expressing either human E2 or E3. The brain levels of Abeta42 in PDAPP/TRE4 mice were substantially elevated even at this very early time point. In older PDAPP/TRE4 mice, the levels of insoluble apoE protein increased in parallel to the dramatic rise in brain Abeta burden, and the majority of apoE was associated with Abeta. In TRE4 only mice, we also observed a significant decrease in the level of apoE in brain homogenates. Since the relative level of apoE mRNA was equivalent in PDAPP/TRE and TRE only mice, it appears that post-translational mechanisms influence the levels of apoE protein in brain (E4 < E3 << E2), resulting in early and dramatic apoE isoform-dependent effects on brain Abeta levels (E4 >> E3 > E2) that increase with age. Therapeutic strategies aimed at increasing the soluble levels of apoE protein, regardless of isoform, may effectively prevent and (or) treat Alzheimer's disease.

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Crossref · 10.1523/jneurosci.0887-09.2009

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  • Plaque deposition is increased with APOE4 compared with APOE2 and APOE3 in humans and transgenic mice expressing familial AD mutations.

    “Plaque deposition is increased with APOE4 compared with APOE2 and APOE3 in humans and transgenic mice expressing familial AD (FAD) mutations (FAD-Tg) (2)(3)(4)(5).”
  • Crossing apoE-targeted replacement mice with PDAPP mice delays plaque deposition from approximately 10 to 18 months, although once detected, plaque levels are greater with APOE4 than APOE3.

    “For example, crossing apoE-targeted replacement mice (apoE-TR) (9) with PDAPP mice (10) delays plaque deposition from ϳ10 to 18 months, although once detected, plaque levels are greater with APOE4 than APOE3 (3).”
  • Introduction of human APOE to existing FAD-Tg mice significantly delays plaque deposition, although once detected, plaque levels are generally greater with APOE4 than APOE3.

    “Introduction of human APOE to existing FAD-Tg mice significantly delays plaque deposition, although once detected, plaque levels are generally greater with APOE4 than APOE3 (3, 6 -8).”
  • Crossing a transgenic mouse model of Alzheimer's disease that has high levels of human Aβ in the brain with human APOE targeted replacement mice demonstrated age-dependent and APOE isoform-dependent (E4>>E3>E2) Aβ deposition and amyloid burden in the brain in a manner that recapitulates the human condition observed in pre-symptomatic elderly APOE4 carriers as well as Alzheimer's disease patients.

    “Crossing a transgenic mouse model of AD that has high levels of human Aβ in the brain with human APOE targeted replacement mice demonstrated age-dependent and APOE isoform-dependent (E4>>E3>E2) Aβ deposition and amyloid burden in the brain in a manner that recapitulates the human condition observed in pre-symptomatic elderly APOE4 carriers as well as AD patients.18–21”
  • Even in homozygous APOE2/2 mice, prior reports have been inconsistent regarding further reductions in amyloid pathology compared with APOE3/3.

    “Even in homozygous APOE2/2 mice, prior reports have been inconsistent regarding further reductions in amyloid pathology compared with APOE3/3 , re fl ecting ongoing debate 34,48,49 .”

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Authors
Bales, K. R., Liu, F., Wu, S., Lin, S., Koger, D., DeLong, C., Hansen, J. C., Sullivan, P. M., & Paul, S. M.
Affiliations
  • Eli Lilly (United States) (US)
  • Duke University (US)
Venue
The Journal of Neuroscience
Published
2009-05-27
Volume
29
Issue
21
Pages
6771-6779
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2066673859
Cited by
274
References
53
Citations by year
2026: 2 · 2025: 13 · 2024: 16 · 2023: 14 · 2022: 18 · 2021: 12 · 2020: 20 · 2019: 12 · 2018: 13 · 2017: 22 · 2016: 15 · 2015: 12 · 2014: 22 · 2013: 18 · 2012: 24
FWCI
14.36
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
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
apolipoprotein E, APOE isoforms, amyloid-beta deposition, amyloid burden, cerebrospinal fluid, brain amyloid, amyloid-beta 42, post-translational regulation, Alzheimer's disease
MeSH terms
Age Factors, Analysis of Variance, Animals, Apolipoproteins E, Brain, Humans, Mice, Inbred C57BL, Mice, Transgenic, Mutation, Peptide Fragments, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Protein Isoforms, Mice

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