Elevated levels of oxidative DNA damage in lymphocytes from patients with Alzheimer's disease

Mónika Mórocz, János Kálmán, Anna Juhász, Ildikó Sinkó, Angela P. McGlynn, C. Stephen Downes, Zoltán Janka, István Raskó

Research output: Contribution to journalArticle

103 Citations (Scopus)


Previous studies have provided evidence of the involvement of oxidative damage in the pathogenesis of Alzheimer's disease (AD). Although the role of oxidative stress in the aetiology of the disease is still not clear, the detection of an increased damage status in the cells of patients could have important therapeutic implications. The level of oxidative damage and repair capacity in peripheral lymphocytes of AD patients and of age-matched controls was determined by the Comet assay applied to freshly isolated blood samples with oxidative lesion-specific DNA repair endonucleases. This is less prone to errors arising from oxidative artifacts than chemical analytical methods; and is therefore a relatively reliable, as well as rapid method for assay of oxidative DNA damage in cells. Statistically significant elevations (P < 0.05) of oxidized purines were observed in nuclear DNA of peripheral lymphocytes from AD patients, compared to age matched control subjects, both at basal level and after oxidative stress induced by H2O2. AD patients also showed a diminished repair of H2O2 -induced oxidized purines.

Original languageEnglish
Pages (from-to)47-53
Number of pages7
JournalNeurobiology of Aging
Issue number1
Publication statusPublished - Jan 1 2002


  • Alzheimer's disease
  • Comet assay
  • DNA-repair
  • Lymphocytes
  • Oxidative stress

ASJC Scopus subject areas

  • Neuroscience(all)
  • Ageing
  • Clinical Neurology
  • Developmental Biology
  • Geriatrics and Gerontology

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