Proteomic identification of specific oxidized proteins in ApoE-knockout mice: Relevance to Alzheimer's disease

Joungil Choi, Michael J. Forster, Shelley R. McDonald, Susan T. Weintraub, Christopher A. Carroll, Robert W. Gracy

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


We have examined oxidized proteins in the brain regions of wild-type (WT) and ApoE-knockout (KO) animals. Total protein oxidation in the hippocampus of young-KO (6 month) animals was approximately 2-fold greater than that of young-WT (6 month) animals and was similar to that of old-WT (18 month) and old-KO (18 month) animals. In the cortex of the same animals, the levels of total protein oxidation in all four groups were not significantly different. Two-dimensional electrophoresis (2-DE) coupled with immunostaining for protein carbonylation revealed six specific oxidation-sensitive proteins, the oxidation levels of which were increased in young-KO, old-WT, and old-KO mice compared with young-WT mice. These six oxidation-sensitive proteins were identified by mass spectrometry as glial fibrillary acidic protein, creatine kinase BB, disulfide isomerase, chaperonin subunit 5, dihydropyrimidase-related protein 2, and mortalin. These results indicate that the ApoE gene product offers protection against age-associated oxidative damage in the brain. Moreover, two of these proteins, creatine kinase and dihydropyrimidase-related protein 2, have recently been found to be oxidized in the brains of human subjects with Alzheimer's disease [Aksenov et al. J. Neurochem. 74: 2520-2527; 2000; Castegna et al. J. Neurochem. 82: 1524-1532; 2002]. These data suggest that the ApoE-knockout mouse serves as an appropriate model for studying pathogenic oxidative mechanisms influencing risk and progression of Alzheimer's disease.

Original languageEnglish (US)
Pages (from-to)1155-1162
Number of pages8
JournalFree Radical Biology and Medicine
Issue number9
StatePublished - May 1 2004


  • Alzheimer's disease
  • ApoE-knockout mice
  • Chaperonin subunit 5
  • Creatine kinase
  • Dihydropyrimidase-like 2
  • Disulfide isomerase
  • Free radicals
  • Glial fibrillary acidic protein
  • Mass spectrometry
  • Mortalin
  • Protein oxidation
  • Two-dimensional gel electrophoresis

ASJC Scopus subject areas

  • Biochemistry
  • Physiology (medical)


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