Nature Communications (Jun 2024)

Co-aggregation with Apolipoprotein E modulates the function of Amyloid-β in Alzheimer’s disease

  • Zengjie Xia,
  • Emily E. Prescott,
  • Agnieszka Urbanek,
  • Hollie E. Wareing,
  • Marianne C. King,
  • Anna Olerinyova,
  • Helen Dakin,
  • Tom Leah,
  • Katy A. Barnes,
  • Martyna M. Matuszyk,
  • Eleni Dimou,
  • Eric Hidari,
  • Yu P. Zhang,
  • Jeff Y. L. Lam,
  • John S. H. Danial,
  • Michael R. Strickland,
  • Hong Jiang,
  • Peter Thornton,
  • Damian C. Crowther,
  • Sohvi Ohtonen,
  • Mireia Gómez-Budia,
  • Simon M. Bell,
  • Laura Ferraiuolo,
  • Heather Mortiboys,
  • Adrian Higginbottom,
  • Stephen B. Wharton,
  • David M. Holtzman,
  • Tarja Malm,
  • Rohan T. Ranasinghe,
  • David Klenerman,
  • Suman De

DOI
https://doi.org/10.1038/s41467-024-49028-z
Journal volume & issue
Vol. 15, no. 1
pp. 1 – 18

Abstract

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Abstract Which isoforms of apolipoprotein E (apoE) we inherit determine our risk of developing late-onset Alzheimer’s Disease (AD), but the mechanism underlying this link is poorly understood. In particular, the relevance of direct interactions between apoE and amyloid-β (Aβ) remains controversial. Here, single-molecule imaging shows that all isoforms of apoE associate with Aβ in the early stages of aggregation and then fall away as fibrillation happens. ApoE-Aβ co-aggregates account for ~50% of the mass of diffusible Aβ aggregates detected in the frontal cortices of homozygotes with the higher-risk APOE4 gene. We show how dynamic interactions between apoE and Aβ tune disease-related functions of Aβ aggregates throughout the course of aggregation. Our results connect inherited APOE genotype with the risk of developing AD by demonstrating how, in an isoform- and lipidation-specific way, apoE modulates the aggregation, clearance and toxicity of Aβ. Selectively removing non-lipidated apoE4-Aβ co-aggregates enhances clearance of toxic Aβ by glial cells, and reduces secretion of inflammatory markers and membrane damage, demonstrating a clear path to AD therapeutics.