Cited by 876Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

ApoE Promotes the Proteolytic Degradation of Aβ

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Jiang, Qingguang, Lee, C.Y. Daniel, Mandrekar, Shweta, Wilkinson, Brandy, Cramer, Paige, Zelcer, Noam, Mann, Karen, Lamb, Bruce +9 more·2008·Neuron

Abstract

Apolipoprotein E is associated with age-related risk for Alzheimer's disease and plays critical roles in Abeta homeostasis. We report that ApoE plays a role in facilitating the proteolytic clearance of soluble Abeta from the brain. The endolytic degradation of Abeta peptides within microglia by neprilysin and related enzymes is dramatically enhanced by ApoE. Similarly, Abeta degradation extracellularly by insulin-degrading enzyme is facilitated by ApoE. The capacity of ApoE to promote Abeta degradation is dependent upon the ApoE isoform and its lipidation status. The enhanced expression of lipidated ApoE, through the activation of liver X receptors, stimulates Abeta degradation. Indeed, aged Tg2576 mice treated with the LXR agonist GW3965 exhibited a dramatic reduction in brain Abeta load. GW3965 treatment also reversed contextual memory deficits. These data demonstrate a mechanism through which ApoE facilitates the clearance of Abeta from the brain and suggest that LXR agonists may represent a novel therapy for AD.

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Crossref · 10.1016/j.neuron.2008.04.010

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  • APOE3 promotes enzyme-mediated degradation of Aβ in microglia more efficiently than APOE4.

    “APOE3 promotes enzyme-mediated degradation of A 𝛃 in microglia more efficiently than APOE4 (295), suggesting the APOE and microglia play a role in the innate immune response in AD (368).”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [295]

  • ApoE is tightly connected to the turnover of Aβ1-42, since it plays a critical role in the normal proteolytic clearance of Aβ1-42.

    “In this regard, ApoE is indeed tightly connected to the turnover of Ab 1 -42 , since it plays a critical role in the normal proteolytic clearance of Ab 1 -42 (14).”
  • Human apoE isoforms differed in their ability to facilitate neprilysin-mediated degradation of Aβ42 within microglia, with apoE4 being the least effective compared to apoE2 or apoE3.

    “One recent in vitro study found that human apoE isoforms differed in their ability to facilitate neprilysin-mediated degradation of Aβ42 within microglia, with apoE4 being the least effective in facilitating Aβ degradation compared to apoE2 or apoE3 (60).”
  • Several studies demonstrated that apoE isoforms can differentially affect Aβ clearance.

    “Several studies demonstrated that apoE isoforms can differentially affect Aβ clearance (Deane et al., 2008; Jiang et al., 2008; Castellano et al., 2011).”
  • Activation of Lxr increases mouse apoE and decreases Aβ levels.

    “In addition, several studies have shown that activation of Lxr increases mouse apoE and decreases Aβ levels (Jiang et al., 2008).”

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Authors
Jiang, Q., Lee, C. Y. D., Mandrekar, S., Wilkinson, B., Cramer, P., Zelcer, N., Mann, K., Lamb, B., Willson, T. M., Collins, J. L., Richardson, J. C., Smith, J. D., Comery, T. A., Riddell, D., Holtzman, D. M., Tontonoz, P., & Landreth, G. E.
Affiliations
  • Case Western Reserve University (US)
  • Howard Hughes Medical Institute (US)
  • Cleveland Clinic (US)
  • GlaxoSmithKline (United Kingdom) (GB)
  • Wyeth (US)
  • Washington University in St. Louis (US)
Corresponding author
Landreth, Gary E.
Venue
Neuron
Publisher
Elsevier BV
Published
2008-06
Volume
58
Issue
5
Pages
681-693
ISSN
0896-6273 (ISSN-L)
OpenAlex
W1994554610
Cited by
876
References
74
Citations by year
2026: 15 · 2025: 34 · 2024: 33 · 2023: 37 · 2022: 35 · 2021: 42 · 2020: 42 · 2019: 47 · 2018: 46 · 2017: 50 · 2016: 57 · 2015: 60 · 2014: 70 · 2013: 70 · 2012: 56
FWCI
41.19
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Pure Amsterdam UMC (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institute on Aging (R01AG013956, R01AG020202, AG020202, R01AG030482, F32AG24031, F32AG024031, R37AG013956, AG13956)
  • National Heart, Lung, and Blood Institute (HL3 0568, P01HL030568, R01HL066082, R01HL066088, HL66088)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
apolipoprotein E, amyloid-beta, neprilysin, insulin-degrading enzyme, microglia, APOE isoforms, lipid modification, liver X receptor, GW3965, Tg2576 mice, Alzheimer's disease, memory impairment
MeSH terms
Liver X Receptors, Aging, Alzheimer Disease, Animals, Animals, Newborn, Apolipoproteins E, Behavior, Animal, Benzoates, Benzylamines, Brain, Cells, Cultured, Disease Models, Animal, DNA-Binding Proteins, Dose-Response Relationship, Drug, Enzyme-Linked Immunosorbent Assay, Memory, Mice, Inbred C57BL, Mice, Transgenic, Peptide Fragments, Time Factors, Amyloid beta-Peptides, Microglia, Receptors, Cytoplasmic and Nuclear, ATP-Binding Cassette Transporters, Mice, Orphan Nuclear Receptors, Plaque, Amyloid, ATP Binding Cassette Transporter 1

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