Cited by 55DNA Repair MechanismsGenetics, Aging, and Longevity in Model OrganismsTelomeres, Telomerase, and Senescence

The ATM Cofactor ATMIN Protects against Oxidative Stress and Accumulation of DNA Damage in the Aging Brain

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Kanu, Nnennaya, Penicud, Kay, Hristova, Mariya, Wong, Barnaby, Irvine, Elaine, Plattner, Florian, Raivich, Gennadij, Behrens, Axel·2010·Journal of Biological Chemistry

Abstract

Progressive accumulation of DNA damage is causally involved in cellular senescence and organismal aging. The DNA damage kinase ATM plays a central role in maintaining genomic stability. ATM mutations cause the genetic disorder ataxia telangiectasia, which is primarily characterized by progressive neurodegeneration and cancer susceptibility. Although the importance of ATM function to protect against oxidative DNA damage and during aging is well described, the mechanism of ATM activation by these stimuli is not known. Here we identify ATM interactor (ATMIN) as an essential component of the ATM signaling pathway in response to oxidative stress and aging. Embryos lacking ATMIN (atmin(Δ/Δ)) died in utero and showed increased numbers of cells positive for phosphorylated histone H2aX, indicative of increased DNA damage. atmin(Δ/Δ) mouse embryonic fibroblasts accumulated DNA damage and prematurely entered senescence when cultured at atmospheric oxygen levels (20%), but this defect was rescued by addition of an antioxidant and also by culturing cells at physiological oxygen levels (3%). In response to acute oxidative stress, atmin(Δ/Δ) mouse embryonic fibroblasts showed slightly lower levels of ATM phosphorylation and reduced ATM substrate phosphorylation. Conditional deletion of ATMIN in the murine nervous system (atmin(ΔN)) resulted in reduced numbers of dopaminergic neurons, as does ATM deficiency. ATM activity was observed in old, but not in young, control mice, but aging-induced ATM signaling was impaired by ATMIN deficiency. Consequently, old atmin(ΔN) mice showed accumulation of DNA damage in the cortex accompanied by gliosis, resulting in increased mortality of aging mutant mice. These results suggest that ATMIN mediates ATM activation by oxidative stress, and thereby ATMIN protects the aging brain by preventing accumulation of DNA damage.

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  • ATMIN is an essential component of the ATM checkpoint pathway in oxidative stress; it mediates oxidative stress-induced ATM activity and protects the aging brain from DNA damage accumulation.

    “ATMIN, an ATM interactor protein, was identified as an essential component in the ATM checkpoint pathway in response to oxidative stress. ATMIN mediates oxidative stress-induced ATM activity, thereby protecting the aging brain from accumulating DNA damage [78].”

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Authors
Kanu, N., Penicud, K., Hristova, M., Wong, B., Irvine, E., Plattner, F., Raivich, G., & Behrens, A.
Affiliations
  • Cancer Research UK (GB)
  • University College London (GB)
  • UCL Queen Square Institute of Neurology (GB)
Corresponding author
Behrens, Axel
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2010-12
Volume
285
Issue
49
Pages
38534-38542
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2066686326
Cited by
55
References
51
Citations by year
2025: 1 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 5 · 2020: 3 · 2019: 5 · 2018: 5 · 2017: 3 · 2016: 7 · 2015: 2 · 2014: 6 · 2013: 4 · 2012: 3
FWCI
1.56
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
Cancer Research UK
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
Keywords
ATM kinase, oxidative stress, DNA damage, brain aging, cellular senescence, ataxia telangiectasia, histone H2A phosphorylation, dopaminergic neurons, gliosis, oxidative DNA damage, antioxidant defense
MeSH terms
Aging, Animals, Antioxidants, Carrier Proteins, Cells, Cultured, Cerebral Cortex, DNA Damage, DNA-Binding Proteins, Embryo, Mammalian, Fibroblasts, Histones, Mice, Mutant Strains, Neurons, Nuclear Proteins, Oxygen, Phosphorylation, Transcription Factors, Cellular Senescence, Protein Serine-Threonine Kinases, Oxidative Stress, Cell Cycle Proteins, Embryo Loss, Tumor Suppressor Proteins, Mice, Ataxia Telangiectasia Mutated Proteins

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