A nontransgenic mouse model shows inducible amyloid-β (Aβ) peptide deposition and elucidates the role of apolipoprotein E in the amyloid cascade
Open accessAbstract
The amyloid-β (Aβ) peptide, a major pathological hallmark of Alzheimer's disease (AD), undergoes a cascade of interactions resulting in the formation of soluble aggregates and their conversion in the brain to insoluble deposits and mature senile plaques. Furthermore, the apoE4 isoform of apolipoprotein E (apoE), which is the major genetic risk factor of AD, is associated with increased Aβ deposition. It is not known how the different Aβ aggregates in the amyloid cascade are formed, contribute to the pathogenesis of AD, or are affected by apoE4. To investigate the initial aggregation stages underlying the amyloid cascade in vivo and how apoE affects them, we examined the effects of prolonged inhibition and subsequent reactivation of the Aβ-degrading protease neprilysin on deposition, disaggregation, and fibrillization of Aβ in apoE-transgenic and control mice. In control mice, intracerebroventricular infusion of thiorphan, which inhibits neprilysin, induced Aβ42 and Aβ40 deposition and fibrillization. On termination of thiorphan treatment, the number of Aβ deposits decreased, whereas the fibrillar Aβ deposits were unaffected. Similar treatments in apoE-deficient mice and mice transgenic for human apoE4 or apoE3 revealed that apoE4 enhances specifically the nucleation and aggregation of immunopositive Aβ deposits and that reversible disaggregation of these deposits and their irreversible conversion to fibrillar deposits are stimulated similarly by the different apoE isoforms. Deposition of Aβ and its enhancement by apoE4 were accompanied by increased astrogliosis both far from and near the Aβ deposits, suggesting that astrogliosis might be triggered by both insoluble and soluble Aβ aggregates.
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Other studies using transgenic mice that possess different human apoE transgenes also demonstrate an isoform-specific difference (E4>E3) in Aβ deposition.
“Other studies using transgenic mice that possess different human apoE transgenes also demonstrate an isoform-specific difference (E4>E3) in Aβ deposition (Buttini et al., 2002; Dolev and Michaelson, 2004).”
From The role of apolipoprotein E in Alzheimer's disease (2009) · cites this paper as Dolev and Michaelson, 2004
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- Authors
- Dolev, I., & Michaelson, D. M.
- Affiliations
- Tel Aviv University (IL)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2004-09-13
- Volume
- 101
- Issue
- 38
- Pages
- 13909-13914
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC518852
- OpenAlex
- W2055425813
- Cited by
- 102
- References
- 13
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 5 · 2023: 1 · 2022: 6 · 2021: 3 · 2020: 4 · 2019: 4 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 4 · 2013: 3 · 2012: 5
- FWCI
- 5.27
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Israel Academy of Sciences and Humanities
- Tel Aviv University
- 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
- amyloid-beta, Alzheimer's disease, apolipoprotein E, APOE ε4, amyloid hypothesis, neprilysin inhibition, thiorphan, amyloid-beta deposition, astrocyte activation, APOE isoforms
- MeSH terms
- Alzheimer Disease, Amyloid, Animals, Apolipoproteins E, Disease Models, Animal, Humans, Mice, Transgenic, Amyloid beta-Peptides, Mice
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