Cited by 51Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDNA Repair Mechanisms

MTH1 and OGG1 maintain a low level of 8-oxoguanine in Alzheimer’s brain, and prevent the progression of Alzheimer’s pathogenesis

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Oka, Sugako, Leon, Julio, Sakumi, Kunihiko, Abolhassani, Nona, Sheng, Zijing, Tsuchimoto, Daisuke, LaFerla, Frank M., Nakabeppu, Yusaku·2021·Scientific Reports

Abstract

8-Oxoguanine (8-oxoG), a major oxidative base lesion, is highly accumulated in Alzheimer's disease (AD) brains during the pathogenic process. MTH1 hydrolyzes 8-oxo-dGTP to 8-oxo-dGMP, thereby avoiding 8-oxo-dG incorporation into DNA. 8-OxoG DNA glycosylase-1 (OGG1) excises 8-oxoG paired with cytosine in DNA, thereby minimizing 8-oxoG accumulation in DNA. Levels of MTH1 and OGG1 are significantly reduced in the brains of sporadic AD cases. To understand how 8-oxoG accumulation in the genome is involved in AD pathogenesis, we established an AD mouse model with knockout of Mth1 and Ogg1 genes in a 3xTg-AD background. MTH1 and OGG1 deficiency increased 8-oxoG accumulation in nuclear and, to a lesser extent, mitochondrial genomes, causing microglial activation and neuronal loss with impaired cognitive function at 4-5 months of age. Furthermore, minocycline, which inhibits microglial activation and reduces neuroinflammation, markedly decreased the nuclear accumulation of 8-oxoG in microglia, and inhibited microgliosis and neuronal loss. Gene expression profiling revealed that MTH1 and OGG1 efficiently suppress progression of AD by inducing various protective genes against AD pathogenesis initiated by Aß/Tau accumulation in 3xTg-AD brain. Our findings indicate that efficient suppression of 8-oxoG accumulation in brain genomes is a new approach for prevention and treatment of AD.

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Authors
Oka, S., Leon, J., Sakumi, K., Abolhassani, N., Sheng, Z., Tsuchimoto, D., LaFerla, F. M., & Nakabeppu, Y.
Affiliations
  • Kyushu University (JP)
  • University of California, Irvine (US)
Corresponding author
Nakabeppu, Yusaku
Venue
Scientific Reports
Published
2021-03-23
Volume
11
Issue
1
Pages
5819-5819
ISSN
2045-2322 (ISSN-L)
OpenAlex
W3138436172
Cited by
51
References
53
Citations by year
2026: 4 · 2025: 17 · 2024: 15 · 2023: 4 · 2022: 6 · 2021: 5
FWCI
4.71
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Kyushu University Institutional Repository (QIR) (Kyushu University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by)
Funders
  • Japan Society for the Promotion of Science (22221004, 17H01391)
  • Ministry of Health, Labour and Welfare (H20-ninchisho-ippan-004)
  • Uehara Memorial Foundation
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
Alzheimer's disease, 8-oxoguanine, MTH1, OGG1, oxidative DNA damage, DNA glycosylase, 3xTg-AD mice, microglial activation, neuroinflammation, neuronal loss, cognitive impairment, minocycline, amyloid-beta, tau protein, mitochondrial DNA
MeSH terms
Alzheimer Disease, Animals, Brain, DNA Damage, DNA Repair, Guanine, Humans, Phosphoric Monoester Hydrolases, Microglia, Mice, Knockout, Oxidative Stress, Disease Progression, Gene Expression Profiling, DNA Glycosylases, Mice

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