APOE Genotype Affects the Pre-synaptic Compartment of Glutamatergic Nerve Terminals

Overview

Journal J Neurochem

Specialties Chemistry
Neurology

Date 2012 Aug 7

PMID 22862561

Citations 48

Authors

Sonya B Dumanis

Amanda M DiBattista

Matthew Miessau

Charbel E H Moussa

G William Rebeck

Affiliations

Soon will be listed here.

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.

Citing Articles

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