Cited by 55Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchAmino Acid Enzymes and Metabolism

APOE genotype affects the pre‐synaptic compartment of glutamatergic nerve terminals

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Dumanis, Sonya B., DiBattista, Amanda M., Miessau, Matthew, Moussa, Charbel E. H., Rebeck, G. William·2013·Journal of Neurochemistry

Abstract

Apolipoprotein E (APOE) genotype affects outcomes of Alzheimer's disease and other conditions of brain damage. Using APOE knock‐in mice, we have previously shown that APOE‐ε4 Targeted Replacement (TR) mice have fewer dendritic spines and reduced branching in cortical neurons. As dendritic spines are post‐synaptic sites of excitatory neurotransmission, we used APOE TR mice to examine whether APOE genotype affected the various elements of the glutamate–glutamine cycle. We found that levels of glutamine synthetase and glutamate uptake transporters were unchanged among the APOE genotypes. However, compared with APOE‐ε3 TR mice, APOE‐ε4 TR mice had decreased glutaminase levels (18%, p < 0.05), suggesting decreased conversion of glutamine to glutamate. APOE‐ε4 TR mice also had increased levels of the vesicular glutamate transporter 1 (20%, p < 0.05), suggesting that APOE genotype affects pre‐synaptic terminal composition. To address whether these changes affected normal neurotransmission, we examined the production and metabolism of glutamate and glutamine at 4–5 months and 1 year. Using high‐frequency 13 C/1 H nuclear magnetic resonance spectroscopy, we found that APOE‐ε4 TR mice have decreased production of glutamate and increased levels of glutamine. These factors may contribute to the increased risk of neurodegeneration associated with APOE‐ε4, and also act as surrogate markers for Alzheimer's disease risk.

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Crossref · 10.1111/j.1471-4159.2012.07908.x

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  • Previous research on humanized APOE mice showed reduced glutamine levels and reduced capacity to incorporate glutamate into the brain of APOE 4TR mice, while glutamate transporters were not significantly changed.

    “Previous research on humanized APOE mice showed reduced glutamine levels, and reduced capacity to incorporate glutamate into the brain of APOE 4TR mice, while glutamate transporters were not significantly changed (Dumanis et al., 2013).”

    From APOE2, E3, and E4 differentially modulate cellular homeostasis, cholesterol metabolism, and inflammatory response in isogenic iPSC-derived astrocytes (2022) · cites this paper as Dumanis et al., 2013

    The Results section reports lower glutamate levels and lower incorporation of a glucose-derived 13C label into glutamate in APOE-ε4 TR mice, but it reports significantly higher—not reduced—glutamine levels. The Abstract says glutamate uptake transporters were unchanged; it also reports an increase in the vesicular glutamate transporter VGLUT1, so the claim is too broad about transporters. Page numbers were not provided in our copy. (LLM, conf=0.88)

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  • ApoE is involved in the modulation of glutamate transport and metabolism.

    “ApoE is also involved in the modulation of glutamate transport and metabolism [128]”
  • These findings suggest a reduced ability of presynaptic ApoE4 neurons to convert glutamine to glutamate and a compensatory increase in vesicular glutamate loading.

    “suggesting a reduced ability of presynaptic ApoE4 neurons to convert glutamine to glutamate and a compensatory increase in vesicular glutamate loading [75].”

    From ApoE, ApoE Receptors, and the Synapse in Alzheimer's Disease (2017) · cites this paper as [75]

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Authors
Dumanis, S. B., DiBattista, A. M., Miessau, M., Moussa, C. E. H., & Rebeck, G. W.
Affiliations
Georgetown University Medical Center (US)
Corresponding author
Rebeck, G. William
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
2012-09-28
Volume
124
Issue
1
Pages
4-14
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W2093187894
Cited by
55
References
49
Citations by year
2025: 1 · 2024: 3 · 2023: 2 · 2022: 5 · 2021: 4 · 2020: 8 · 2019: 4 · 2018: 3 · 2017: 6 · 2016: 4 · 2015: 3 · 2014: 8 · 2013: 3 · 2012: 1
FWCI
3.22
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Science Foundation
  • National Institutes of Health
  • National Institute on Aging (P01AG030128, AG 30378, R01AG035379, K01AG030378)
  • National Institute of Neurological Disorders and Stroke (T32NS041231)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
apolipoprotein E, APOE ε4, glutamate-glutamine cycle, VGLUT1, glutaminase, glutamate synthesis, glutamine, dendritic spines, glutamine synthetase, Alzheimer's disease risk, neurodegeneration
MeSH terms
Animals, Apolipoproteins E, Brain, Carbon Isotopes, Gene Expression Regulation, Glutaminase, Humans, Mice, Inbred C57BL, Mice, Transgenic, Magnetic Resonance Spectroscopy, Tritium, Presynaptic Terminals, Glutamic Acid, Vesicular Glutamate Transport Protein 1, Mice, Apolipoprotein E3, Apolipoprotein E4, Apolipoprotein E2

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