Cited by 70Alzheimer's disease research and treatmentsCellular transport and secretionNeuroinflammation and Neurodegeneration Mechanisms

ApoER2 expression increases Aβ production while decreasing Amyloid Precursor Protein (APP) endocytosis: possible role in the partitioning of APP into lipid rafts and in the regulation of γ-secretase activity

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Fuentealba, Rodrigo A, Barría, Maria Ines, Lee, Jiyeon, Cam, Judy, Araya, Claudia, Escudero, Claudia A, Inestrosa, Nibaldo C, Bronfman, Francisca C +2 more·2007·Molecular Neurodegeneration

Abstract

Background: The generation of the amyloid-β peptide (Aβ) through the proteolytic processing of the amyloid precursor protein (APP) is a central event in the pathogenesis of Alzheimer's disease (AD). Recent studies highlight APP endocytosis and localization to lipid rafts as important events favoring amyloidogenic processing. However, the precise mechanisms underlying these events are poorly understood. ApoER2 is a member of the low density lipoprotein receptor (LDL-R) family exhibiting slow endocytosis rate and a significant association with lipid rafts. Despite the important neurophysiological roles described for ApoER2, little is known regarding how ApoER2 regulates APP trafficking and processing. Results: Here, we demonstrate that ApoER2 physically interacts and co-localizes with APP. Remarkably, we found that ApoER2 increases cell surface APP levels and APP association with lipid rafts. The increase of cell surface APP requires the presence of ApoER2 cytoplasmic domain and is a result of decreased APP internalization rate. Unexpectedly, ApoER2 expression correlated with a significant increase in Aβ production and reduced levels of APP-CTFs. The increased Aβ production was dependent on the integrity of the NPxY endocytosis motif of ApoER2. We also found that expression of ApoER2 increased APP association with lipid rafts and increased γ-secretase activity, both of which might contribute to increased Aβ production. Conclusion: These findings show that ApoER2 negatively affects APP internalization. However, ApoER2 expression stimulates Aβ production by shifting the proportion of APP from the non-rafts to the raft membrane domains, thereby promoting β-secretase and γ-secretase mediated amyloidogenic processing and also by incrementing the activity of γ-secretase.

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  • Interactions of ApoER2 with APP affect APP processing, leading to increased production of Aβ.

    “Interactions of ApoER2 with APP are known to affect APP processing, leading to the increased production of Aβ (Fuentealba et al., 2007; He et al., 2007).”

    From The role of apolipoprotein E in Alzheimer's disease (2009) · cites this paper as Fuentealba et al., 2007

  • Co-expression of ApoER2 with APP promotes APP surface expression and lipid raft association of APP, both of which reduce Aβ formation.

    “Co-expression of ApoER2 with APP promotes APP surface expression and the lipid raft association of APP, both of which reduce A␤ formation (64).”

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Authors
Fuentealba, R. A., Barría, M. I., Lee, J., Cam, J., Araya, C., Escudero, C. A., Inestrosa, N. C., Bronfman, F. C., Bu, G., & Marzolo, M.-P.
Affiliations
  • Pontificia Universidad Católica de Chile (CL)
  • Washington University in St. Louis (US)
Venue
Molecular Neurodegeneration
Published
2007-07-09
Volume
2
Issue
1
Pages
14-14
ISSN
1750-1326 (ISSN-L)
OpenAlex
W2137318731
Cited by
70
References
88
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 4 · 2017: 4 · 2016: 5 · 2015: 3 · 2014: 8 · 2013: 3 · 2012: 8
FWCI
4.00
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Commons@Becker (Washington University School of Medicine) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
  • Alzheimer's Association
  • Washington University in St. Louis
  • KU Leuven
  • Universidad de Chile
  • Instituto Millenium
  • Pontificia Universidad Católica de Chile
  • National Institute on Aging (R01AG027924)
  • National Cancer Institute
  • Fogarty International Center (R03TW006456)
  • Fondo de Financiamiento de Centros de Investigación en Áreas Prioritarias (13980001)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
ApoER2, amyloid precursor protein, amyloid-beta production, APP endocytosis, lipid rafts, gamma-secretase, Alzheimer's disease, APP trafficking, NPXY motif, beta-secretase, LDL receptor family

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