Cited by 39Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchDementia and Cognitive Impairment Research

ApoE4 expression accelerates hippocampus-dependent cognitive deficits by enhancing Aβ impairment of insulin signaling in an Alzheimer’s disease mouse model

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Chan, Elizabeth S., Shetty, Mahesh Shivarama, Sajikumar, Sreedharan, Chen, Christopher, Soong, Tuck Wah, Wong, Boon-Seng·2016·Scientific Reports

Abstract

The apolipoprotein E4 (ApoE4) is the strongest genetic risk factor for Alzheimer’s disease (AD). The AD brain was shown to be insulin resistant at end stage, but the interplay between insulin signaling, ApoE4 and Aβ across time and their involvement in memory decline is unclear. To investigate insulin response in the ageing mouse hippocampus, we crossed the human ApoE-targeted replacement mice with the mutant human amyloid precursor protein (APP) mice (ApoExAPP). While hippocampal Aβ levels were comparable between ApoE3xAPP and ApoE4xAPP mice at 26 weeks, insulin response was impaired in the ApoE4xAPP hippocampus. Insulin treatment was only able to stimulate insulin signaling and increased AMPA-GluR1 phosphorylation in forskolin pre-treated hippocampal slices from ApoE3xAPP mice. In ApoE4xAPP mice, insulin dysfunction was also associated with poorer spatial memory performance. Using dissociated hippocampal neuron in vitro, we showed that insulin response in ApoE3 and ApoE4 neurons increased AMPA receptor-mediated miniature excitatory postsynaptic current (mEPSC) amplitudes and GluR1-subunit insertion. Pre-treatment of ApoE3 neurons with Aβ42 did not affect insulin-mediated GluR1 subunit insertion. However, impaired insulin sensitivity observed only in the presence of ApoE4 and Aβ42, attenuated GluR1-subunit insertion. Taken together, our results suggest that ApoE4 enhances Aβ inhibition of insulin-stimulated AMPA receptor function, which accelerates memory impairment in ApoE4xAPP mice.

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  • Amyloid plaque burden is higher in APP/ApoE4 mice compared with APP/ApoE3 mice.

    “Because amyloid plaque burden is higher in the ApoE4 mice compared with ApoE3 mice, it is hard to rule out whether the higher amount of amyloid β in the APP/ApoE4 mice actually contributes to the insulin resistance.”

    From Apolipoprotein E metabolism and functions in brain and its role in Alzheimer's disease (2017) · cites this paper as [49]

    The Results section reports higher hippocampal plaque load in ApoE4xAPP than ApoE3xAPP mice at 52 and 78 weeks. It also reports no significant difference at 26 weeks, when the Discussion says insulin signaling was already impaired in ApoE4xAPP mice. The unqualified claim therefore omits an important age limitation. (LLM, conf=0.91)

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  • ApoE4 enhanced amyloid β-induced impairment of insulin signaling and accelerated hippocampal-dependent cognitive deficits compared with ApoE3 in an APP mouse model expressing human ApoE isoforms.

    “ApoE4 enhanced the amyloid β-induced impairment of insulin signaling and accelerated the hippocampal-dependent cognitive deficits, as compared with ApoE3 [49].”

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Research works printed but not linked: 1

  1. Zilles K., Wu J., Crusio W. E. & Schwegler H. Water maze and radial maze learning and the density of binding sites of glutamate, GABA, and serotonin receptors in the hippocampus of inbred mouse strains. Hippocampus 10, 213– 225 (2000). 10902891

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Authors
Chan, E. S., Shetty, M. S., Sajikumar, S., Chen, C., Soong, T. W., & Wong, B.-S.
Affiliations
National University of Singapore (SG)
Corresponding author
Wong, Boon-Seng
Venue
Scientific Reports
Published
2016-05-18
Volume
6
Issue
1
Pages
26119-26119
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2403478980
Cited by
39
References
68
Citations by year
2026: 2 · 2025: 2 · 2024: 1 · 2022: 3 · 2021: 6 · 2020: 6 · 2019: 7 · 2018: 8 · 2017: 3 · 2016: 1
FWCI
5.10
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • National University of Singapore (submittedVersion)
Funders
  • National University of Singapore
  • National University Health System (NUHSRO/2011/005/STB/B2B-01)
  • Medical Research Council
  • National Medical Research Council (NMRC/CBRG/0090/2015)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
APOE ε4, Alzheimer's disease, amyloid-beta, insulin signaling, insulin resistance, hippocampus, AMPA receptors, spatial memory, APP transgenic mice, memory impairment, miniature excitatory postsynaptic currents
MeSH terms
Alzheimer Disease, Animals, Disease Models, Animal, Hippocampus, Humans, Insulin, Mice, Transgenic, Signal Transduction, Amyloid beta-Peptides, Receptors, AMPA, Mice, Apolipoprotein E4, Cognitive Dysfunction

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