Cited by 1,885Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Oxidative Damage Is the Earliest Event in Alzheimer Disease

Open access
Nunomura, Akihiko, Perry, George, Aliev, Gjumrakch, Hirai, Keisuke, Takeda, Atsushi, Balraj, Elizabeth K., Jones, Paul K., Ghanbari, Hossein +6 more·2001·Journal of Neuropathology & Experimental Neurology

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.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1093/jnen/60.8.759

Cites

58 of 58 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Oxidative damage is an early event in the pathogenesis of Alzheimer's disease, occurring before the onset of clinical symptoms, and is also a factor contributing to disease progression.

    “Past and recent studies have demonstrated that oxidative damage is not only an early event in the pathogenesis of AD, occurring before the onset of clinical symptoms but also a factor contributing to the disease progression [17,18,19,20,21].”
  • In brains of individuals with Alzheimer's disease, preclinical AD, and mild cognitive impairment, many oxidative damage products are measured, and oxidative stress is a key and early player in the pathogenesis of neurodegeneration and AD.

    “In the brains of individuals with AD and preclinical AD (i.e., evidence of Aβ and tau deposition in the brain without any clinical manifestation of the disease), as well as patients with MCI (a mild clinical impairment with no proof of underlying pathology with biomarkers), many oxidative damage products are measured, and numerous investigations have pointed to OS as a key and early player in the”
  • In the Alzheimer's disease brain, mitochondria can be sources of reactive oxygen species and also targets of oxidative stress, and mitochondrial DNA is especially susceptible to oxidative damage.

    “In the AD brain, mitochondria can be sources of ROS and also the target of OS, especially mitochondrial DNA (mtDNA) is susceptible to oxidative damage [19,53,63].”
  • Oxidative damage to RNA in entorhinal cortex, hippocampus, subiculum, and temporal neocortex of subjects with Alzheimer's disease has been described; levels of 8-OHdG increase early before pathological changes occur, which may explain that selective vulnerability of entorhinal cortex neurons in AD may be related to vulnerability to oxidative damage.

    “Oxidative damage to RNA in EC, hippocampus, subiculum, and temporal neocortex of subjects with AD has been described. The levels of 8-OHdG increase early before pathological changes occur, and this can explain that the selective vulnerability of neurons in the EC during AD may be related to the vulnerability of these particular neurons to oxidative damage [19].”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 7

  1. Smith MA, Rottkamp CA, Nunomura A, Raina AK, Perry G. Ox- idative stress in Alzheimer's disease. Biochem Biophys Acta 2000; 1502:139-44
  2. Smith MA, Perry G, Richey PL, et al. Oxidative damage in Al- zheimer's. Nature 1996;382:120-21
  3. Smith JD, Sikes J, Perry G, Smith MA. ApoE: Isoform specific antioxidant activity [abstract]. Neurobiol Aging 1998;19:S222
  4. Sternberger LA. Immunocytochemistry. Third edition, New York: Wiley, 1986
  5. McNamara MJ, Gomez-Isla T, Hyman BT. Apolipoprotein E ge- notype and deposits of A␤40 and A␤42 in Alzheimer disease. Arch Neurol 1998;55:1001-4
  6. Nunomura A, Chiba S, Lippa CF, Smith MA, Perry G. Increasing amyloid ß 42 deposition is associated with decreasing neuronal RNA oxidation in Down's syndrome and familial Alzheimer's dis- ease [abstract]. Brain Pathol 2000;10:783
  7. Gouras GK, Tsai J, Naslund J, et al. Intraneuronal A␤42 accumu- lation in human brain. Am J Pathol 2000;156:15-20

Cited by

Sorted by citations

Authors
Nunomura, A., Perry, G., Aliev, G., Hirai, K., Takeda, A., Balraj, E. K., Jones, P. K., Ghanbari, H., Wataya, T., Shimohama, S., Chiba, S., Atwood, C. S., Petersen, R. B., & Smith, M. A.
Affiliations
  • Asahikawa Medical University (JP)
  • Case Western Reserve University (US)
  • Takeda (Japan) (JP)
  • Sensei Biotherapeutics (United States) (US)
  • Kyoto University (JP)
Corresponding author
Nunomura, Akihiko
Venue
Journal of Neuropathology & Experimental Neurology
Published
2001-08
Volume
60
Issue
8
Pages
759-767
ISSN
  • 0022-3069 (ISSN-L)
  • 1554-6578
OpenAlex
W1542215809
Cited by
1,885
References
58
Citations by year
2026: 46 · 2025: 31 · 2024: 52 · 2023: 61 · 2022: 80 · 2021: 98 · 2020: 86 · 2019: 82 · 2018: 69 · 2017: 73 · 2016: 70 · 2015: 83 · 2014: 86 · 2013: 86 · 2012: 104
FWCI
33.08
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuropathology & Experimental Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Asahikawa Medical University Collection and Research (Asahikawa Medical University) (submittedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion)
Funders
  • Alzheimer's Association
  • National Institutes of Health (5r01ag009287-08, AG09287)
  • Japan Society for the Promotion of Science (12670918)
  • National Institute on Aging (AG-14249, R01AG014249, AG 09287)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, oxidative damage, 8-hydroxyguanosine, nitrotyrosine, amyloid plaques, neurofibrillary tangles, APOE ε4, disease progression, neurodegeneration, reactive oxygen species, RNA oxidation
MeSH terms
Aged, Alzheimer Disease, Apolipoproteins E, Brain, Female, Genotype, Guanosine, Heterozygote, Humans, Male, Middle Aged, Neurons, Tyrosine, Amyloid beta-Peptides, Neurofibrillary Tangles, Oxidative Stress, Disease Progression, Plaque, Amyloid

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review