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Apolipoprotein E impairs amyloid-β fibril elongation and maturation.

Authors
  • Islam, Tohidul1
  • Gharibyan, Anna L1
  • Golchin, Solmaz A1
  • Pettersson, Nina1
  • Brännström, Kristoffer1
  • Hedberg, Isabell1
  • Virta, Merit-Miriam1
  • Olofsson, Linnea1
  • Olofsson, Anders1
  • 1 Department of Medical Biochemistry and Biophysics, Umeå University, Sweden. , (Sweden)
Type
Published Article
Journal
FEBS Journal
Publisher
Wiley (Blackwell Publishing)
Publication Date
Sep 30, 2019
Identifiers
DOI: 10.1111/febs.15075
PMID: 31571352
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Alzheimer's disease (AD) is strongly linked to amyloid depositions of the Aβ peptide (Aβ). The lipid-binding protein apolipoprotein E (ApoE) has been found to interfere with Aβ amyloid formation and to exert a strong clinical impact to the pathology of AD. The APOE gene exists in three allelic isoforms represented by APOE ε2, APOE ε3, and APOE ε4. Carriers of the APOE ε4 variant display a gene dose-dependent increased risk of developing the disease. Aβ amyloids are formed via a nucleation-dependent mechanism where free monomers are added onto a nucleus in a template-dependent manner. Using a combination of surface plasmon resonance and thioflavin-T assays, we here show that ApoE can target the process of fibril elongation and that its interference effectively prevents amyloid maturation. We expose a complex equilibrium where the concentration of ApoE, Aβ monomers, and the amount of already formed Aβ fibrils will affect the relative proportion and formation rate of mature amyloids versus alternative assemblies. The result illustrates a mechanism which may affect both the clearance rate of Aβ assemblies in vivo and the population of cytotoxic Aβ assemblies. © 2019 Federation of European Biochemical Societies.

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