Apolipoprotein E modulates Alzheimer's Abeta(1-42)-induced oxidative damage to synaptosomes in an allele-specific manner

Brain Res. 2002 Jan 4;924(1):90-7. doi: 10.1016/s0006-8993(01)03228-0.

Abstract

Several functional differences have been reported among the three human e2, e3, and e4 alleles of apolipoprotein E (apoE). One functional difference lies in the antioxidant potential of these alleles; e4 has the poorest potential. Interestingly, e4 also correlates with increased oxidative damage in the Alzheimer's disease (AD) brain, which may explain why the inheritance of the e4 allele is a risk factor for the onset of AD. Beta-amyloid (Abeta) is also intimately involved in AD and promotes oxidative damage in vitro; therefore, we have examined the role of the different apoE alleles in modulating Abeta(1-42)-induced oxidation to synaptosomes. Measurement of specific markers of oxidation in synaptosomes isolated from mice that express one of the human apoE alleles indicates that Abeta-induced increases of these markers can be modulated by apoE in an allele-dependent manner (e2>e3>e4). Increases in reactive oxygen species formation and protein and lipid oxidation were always greatest in e4 synaptosomes as compared to e2 and e3 synaptosomes. Our data support the role of apoE as a modulator of Abeta toxicity and, consistent with the antioxidant potentials of the three alleles, suggest that the e4 allele may not be as effective in this role as the e2 or e3 alleles of apoE. These results are discussed with reference to mechanistic implications for neurodegeneration in the AD brain.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aldehydes / metabolism
  • Alleles
  • Alzheimer Disease / genetics
  • Alzheimer Disease / metabolism*
  • Alzheimer Disease / physiopathology
  • Amyloid beta-Peptides / metabolism
  • Amyloid beta-Peptides / pharmacology*
  • Animals
  • Apolipoproteins E / genetics
  • Apolipoproteins E / metabolism*
  • Brain / metabolism*
  • Brain / physiopathology
  • Cyclic N-Oxides
  • Lipid Peroxidation / drug effects
  • Lipid Peroxidation / genetics
  • Mice
  • Mice, Transgenic
  • Nerve Tissue Proteins / metabolism
  • Neurons / metabolism*
  • Neurons / pathology
  • Oxidative Stress / drug effects
  • Oxidative Stress / genetics*
  • Peptide Fragments / metabolism
  • Peptide Fragments / pharmacology*
  • Reactive Oxygen Species / metabolism
  • Synaptosomes / drug effects
  • Synaptosomes / metabolism*
  • Thiobarbiturates

Substances

  • Aldehydes
  • Amyloid beta-Peptides
  • Apolipoproteins E
  • Cyclic N-Oxides
  • Nerve Tissue Proteins
  • Peptide Fragments
  • Reactive Oxygen Species
  • Thiobarbiturates
  • amyloid beta-protein (1-42)
  • 4-maleimido-2,2,6,6-tetramethylpiperidinooxyl
  • 4-hydroxy-2-nonenal
  • thiobarbituric acid