Cited by 92Mitochondrial Function and PathologyGenetics, Aging, and Longevity in Model OrganismsAutophagy in Disease and Therapy

Low-dose rapamycin extends lifespan in a mouse model of mtDNA depletion syndrome

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Siegmund, Stephanie E, Yang, Hua, Sharma, Rohit, Javors, Martin, Skinner, Owen, Mootha, Vamsi, Hirano, Michio, Schon, Eric A·2017·Human Molecular Genetics

Abstract

Mitochondrial disorders affecting oxidative phosphorylation (OxPhos) are caused by mutations in both the nuclear and mitochondrial genomes. One promising candidate for treatment is the drug rapamycin, which has been shown to extend lifespan in multiple animal models, and which was previously shown to ameliorate mitochondrial disease in a knock-out mouse model lacking a nuclear-encoded gene specifying an OxPhos structural subunit (Ndufs4). In that model, relatively high-dose intraperitoneal rapamycin extended lifespan and improved markers of neurological disease, via an unknown mechanism. Here, we administered low-dose oral rapamycin to a knock-in (KI) mouse model of authentic mtDNA disease, specifically, progressive mtDNA depletion syndrome, resulting from a mutation in the mitochondrial nucleotide salvage enzyme thymidine kinase 2 (TK2). Importantly, low-dose oral rapamycin was sufficient to extend Tk2KI/KI mouse lifespan significantly, and did so in the absence of detectable improvements in mitochondrial dysfunction. We found no evidence that rapamycin increased survival by acting through canonical pathways, including mitochondrial autophagy. However, transcriptomics and metabolomics analyses uncovered systemic metabolic changes pointing to a potential 'rapamycin metabolic signature.' These changes also implied that rapamycin may have enabled the Tk2KI/KI mice to utilize alternative energy reserves, and possibly triggered indirect signaling events that modified mortality through developmental reprogramming. From a therapeutic standpoint, our results support the possibility that low-dose rapamycin, while not targeting the underlying mtDNA defect, could represent a crucial therapy for the treatment of mtDNA-driven, and some nuclear DNA-driven, mitochondrial diseases.

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Authors
Siegmund, S. E., Yang, H., Sharma, R., Javors, M., Skinner, O., Mootha, V., Hirano, M., & Schon, E. A.
Affiliations
  • Massachusetts General Hospital (US)
  • The University of Texas at San Antonio (US)
  • Columbia University Irving Medical Center (US)
Corresponding author
Schon, Eric A
Venue
Human Molecular Genetics
Published
2017-09-01
Volume
26
Issue
23
Pages
4588-4605
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2753910921
Cited by
92
References
72
Citations by year
2026: 7 · 2025: 9 · 2024: 6 · 2023: 5 · 2022: 14 · 2021: 14 · 2020: 12 · 2019: 13 · 2018: 11
FWCI
4.02
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Human Molecular Genetics (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Defense (W911F-15-1-0169)
  • Howard Hughes Medical Institute
  • National Institutes of Health (AG013319)
  • National Institute on Aging (P30AG013319, U01AG022307, P30AG044271)
  • National Institute of Neurological Disorders and Stroke (F30NS093798)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (P01HD080642)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
rapamycin, mtDNA depletion syndrome, thymidine kinase 2, mitochondrial disease, lifespan extension, mitophagy, oxidative phosphorylation, developmental reprogramming, metabolic reprogramming, knock-in mice
MeSH terms
Animals, Autophagy, Disease Models, Animal, DNA, Mitochondrial, Dose-Response Relationship, Drug, Female, Male, Mitochondria, Mutation, Oxidative Phosphorylation, Syndrome, Thymidine Kinase, Signal Transduction, Sirolimus, Mitochondrial Diseases, Electron Transport Complex I, Mice, Gene Knock-In Techniques

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