ApoE4 reduces glutamate receptor function and synaptic plasticity by selectively impairing ApoE receptor recycling

Ying Chen, Murat S. Durakoglugil, Xunde Xian, Joachim Herz

Research output: Contribution to journalArticle

170 Scopus citations

Abstract

Apolipoprotein E (ApoE) genotype is a powerful genetic modifier of Alzheimer's disease (AD). The ApoE4 isoform significantly reduces the mean age-of-onset of dementia through unknown mechanisms. Here, wes how that ApoE4 selectively impairs synaptic plasticity and NMDA receptor phosphorylation by Reelin, a regulator of brain development and modulator of synaptic strength. ApoE4 reduces neuronal surface expression of Apoer2, adual function receptor for ApoE and for Reelin, as well as NMDA and AMPA receptors by sequestration in intracellular compartments, thereby critically reducing the ability of Reelin to enhance synaptic glutamate receptor activity. As a result, the ability of Reelin to prevent LTP suppression by extracts from AD-afflicted human brains in hippocampal slices from knockin mice expressing the human ApoE4 isoform is severely impaired. These findings show an isoform-specific role of ApoE in the localization and intracellular trafficking of lipoprotein and glutamate receptors and thereby reveal an alternative mechanism by which ApoE4 may accelerate onset of dementia and neuronal degeneration by differentially impairing the maintenance of synaptic stability.

Original languageEnglish (US)
Pages (from-to)12011-12016
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number26
DOIs
Publication statusPublished - Jun 29 2010

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Keywords

  • Alzheimer's disease
  • Lipoprotein receptor
  • Neurodegeneration
  • NMDA receptor
  • Reelin

ASJC Scopus subject areas

  • General

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