Apolipoprotein E4 effects in Alzheimer's disease are mediated by synaptotoxic oligomeric amyloid-β

Robert M. Koffie, Tadafumi Hashimoto, Hwan Ching Tai, Kevin R. Kay, Alberto Serrano-Pozo, Daniel Joyner, Steven Hou, Katherine J. Kopeikina, Matthew P. Frosch, Virginia M. Lee, David M. Holtzman, Bradley T. Hyman, Tara L. Spires-Jones

Research output: Contribution to journalArticlepeer-review

179 Scopus citations

Abstract

The apolipoprotein E ε4 gene is the most important genetic risk factor for sporadic Alzheimer's disease, but the link between this gene and neurodegeneration remains unclear. Using array tomography, we analysed >50 000 synapses in brains of 11 patients with Alzheimer's disease and five non-demented control subjects and found that synapse loss around senile plaques in Alzheimer's disease correlates with the burden of oligomeric amyloid-β in the neuropil and that this synaptotoxic oligomerized peptide is present at a subset of synapses. Further analysis reveals apolipoprotein E ε4 patients with Alzheimer's disease have significantly higher oligomeric amyloid-β burden and exacerbated synapse loss around plaques compared with apolipoprotein E ε3 patients. Apolipoprotein E4 protein colocalizes with oligomeric amyloid-β and enhances synaptic localization of oligomeric amyloid-β by >5-fold. Biochemical characterization shows that the amyloid-β enriched at synapses by apolipoprotein E4 includes sodium dodecyl sulphate-stable dimers and trimers. In mouse primary neuronal culture, lipidated apolipoprotein E4 enhances oligomeric amyloid-β association with synapses via a mechanism involving apolipoprotein E receptors. Together, these data suggest that apolipoprotein E4 is a co-factor that enhances the toxicity of oligomeric amyloid-β both by increasing its levels and directing it to synapses, providing a link between apolipoprotein E ε4 genotype and synapse loss, a major correlate of cognitive decline in Alzheimer's disease.

Original languageEnglish
Pages (from-to)2155-2168
Number of pages14
JournalBrain
Volume135
Issue number7
DOIs
StatePublished - Jul 2012

Keywords

  • Alzheimer's disease
  • Apolipoprotein E
  • Array tomography
  • Oligomeric amyloid-β
  • Synapse

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