Oxidative damage is the earliest event in Alzheimer disease.

Abstract:

:Recently, we demonstrated a significant increase of an oxidized nucleoside derived from RNA, 8-hydroxyguanosine (8OHG), and an oxidized amino acid, nitrotyrosine in vulnerable neurons of patients with Alzheimer disease (AD). To determine whether oxidative damage is an early- or end-stage event in the process of neurodegeneration in AD, we investigated the relationship between neuronal 8OHG and nitrotyrosine and histological and clinical variables, i.e. amyloid-beta (A beta) plaques and neurofibrillary tangles (NFT), as well as duration of dementia and apolipoprotein E (ApoE) genotype. Our findings show that oxidative damage is quantitatively greatest early in the disease and reduces with disease progression. Surprisingly, we found that increases in A beta deposition are associated with decreased oxidative damage. These relationships are more significant in ApoE epsilon4 carriers. Moreover, neurons with NFT show a 40%-56% decrease in relative 8OHG levels compared with neurons free of NFT. Our observations indicate that increased oxidative damage is an early event in AD that decreases with disease progression and lesion formation. These findings suggest that AD is associated with compensatory changes that reduce damage from reactive oxygen.

authors

Nunomura A,Perry G,Aliev G,Hirai K,Takeda A,Balraj EK,Jones PK,Ghanbari H,Wataya T,Shimohama S,Chiba S,Atwood CS,Petersen RB,Smith MA

doi

10.1093/jnen/60.8.759

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

759-67

issue

8

eissn

0022-3069

issn

1554-6578

journal_volume

60

pub_type

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