Cited by 365Mitochondrial Function and PathologyAutophagy in Disease and TherapyDNA Repair Mechanisms

Mitochondrial dysfunction in ataxia-telangiectasia

Open access
Valentin-Vega, Yasmine A., MacLean, Kirsteen H., Tait-Mulder, Jacqueline, Milasta, Sandra, Steeves, Meredith, Dorsey, Frank C., Cleveland, John L., Green, Douglas R. +1 more·2012·Blood

Abstract

Ataxia-telangiectasia mutated (ATM) plays a central role in DNA damage responses, and its loss leads to development of T-cell malignancies. Here, we show that ATM loss also leads to intrinsic mitochondrial abnormalities in thymocytes, including elevated reactive oxygen species, increased aberrant mitochondria, high cellular respiratory capacity, and decreased mitophagy. A fraction of ATM protein is localized in mitochondria, and it is rapidly activated by mitochondrial dysfunction. Unexpectedly, allelic loss of the autophagy regulator Beclin-1 significantly delayed tumor development in ATM-null mice. This effect was not associated with rescue of DNA damage signaling but rather with a significant reversal of the mitochondrial abnormalities. These data support a model in which ATM plays direct roles in modulating mitochondrial homeostasis and suggest that mitochondrial dysfunction and associated increases in mitochondrial reactive oxygen species contribute to the cancer-prone phenotype observed in organisms lacking ATM. Thus, ataxia-telangiectasia should be considered, at least in part, as a mitochondrial disease.

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Crossref · 10.1182/blood-2011-08-373639

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  • An ATM mouse model displayed mitochondrial dysfunction, higher ROS, and build-up of damaged mitochondria.

    “Analysis of an ATM mouse model showed dysfunctional mitochondria with increased ROS levels and the accumulation of damaged mitochondria87.”

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Authors
Valentin-Vega, Y. A., MacLean, K. H., Tait-Mulder, J., Milasta, S., Steeves, M., Dorsey, F. C., Cleveland, J. L., Green, D. R., & Kastan, M. B.
Affiliations
  • Departments of Oncology and
  • St. Jude Children's Research Hospital (US)
  • Scripps Research Institute (US)
Venue
Blood
Published
2012-02-09
Volume
119
Issue
6
Pages
1490-1500
ISSN
  • 0006-4971 (ISSN-L)
  • 1528-0020
OpenAlex
W2120886826
Cited by
365
References
51
Citations by year
2026: 8 · 2025: 15 · 2024: 20 · 2023: 17 · 2022: 22 · 2021: 46 · 2020: 30 · 2019: 26 · 2018: 15 · 2017: 29 · 2016: 38 · 2015: 25 · 2014: 27 · 2013: 29 · 2012: 17
FWCI
9.47
Type
journal article
Language
en
Open access
Locations
  • Blood (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA076379, R01CA157216, CA71387, CA157216, R01CA076379, P 30CA 21765, R01CA071387, P30CA021765)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
ataxia telangiectasia, ATM, mitochondrial dysfunction, thymocytes, reactive oxygen species, mitophagy, cellular respiration, Beclin-1, autophagy, DNA damage response, T-cell malignancies, mitochondrial homeostasis, cancer susceptibility
MeSH terms
Beclin-1, Adenosine Triphosphate, Animals, Ataxia Telangiectasia, Autophagy, Cells, Cultured, DNA-Binding Proteins, Fibroblasts, Humans, Membrane Proteins, Mice, Inbred C57BL, Mitochondria, Oxygen Consumption, Immunoblotting, Gene Expression, Lymphoma, T-Cell, Protein Serine-Threonine Kinases, Reactive Oxygen Species, Mice, Knockout, Cell Cycle Proteins, Reverse Transcriptase Polymerase Chain Reaction, Tumor Suppressor Proteins, RNA Interference, Microscopy, Electron, Transmission, Apoptosis Regulatory Proteins, Mice, Membrane Potential, Mitochondrial, Kaplan-Meier Estimate, Thymocytes, Ataxia Telangiectasia Mutated Proteins

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