Cited by 88Genetics, Aging, and Longevity in Model OrganismsPI3K/AKT/mTOR signaling in cancerMuscle metabolism and nutrition

Assessment of mitochondrial biogenesis and mTORC1 signaling during chronic rapamycin feeding in male and female mice

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Drake, Joshua C., Peelor, Frederick F., Biela, Laurie M., Watkins, Molly K., Miller, Richard A., Hamilton, Karyn L., Miller, Benjamin F.·2013·The Journals of Gerontology Series A

Abstract

Chronic inhibition of the protein synthesis regulator mTORC1 through rapamycin extends life span in mice, with longer extension in females than in males. Whether rapamycin treatment inhibits protein synthesis or whether it does so differently between sexes has not been examined. UM-HET3 mice were fed a control or rapamycin-supplemented (Rap) diet for 12 weeks. Protein synthesis in mixed, cytosolic (cyto), and mitochondrial (mito) fractions and DNA synthesis and mTORC1 signaling were determined in skeletal muscle, heart, and liver. In both sexes, mito protein synthesis was maintained in skeletal muscle from Rap despite decreases in mixed and cyto fractions, DNA synthesis, and rpS6 phosphorylation. In the heart, no change in protein synthesis occurred despite the decreased DNA synthesis. In the heart and liver, Rap males were more sensitive to mTORC1 inhibition than Rap females. In conclusion, we show changes in protein synthesis and mTORC1 signaling that differ by sex and tissue.

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  1. Neese RA, Misell LM, Turner S, et al. Measurement in vivo of prolifer- ation rates of slow turnover cells by 2H2O labeling of the deoxyribose moiety of DNA. Proc Natl Acad Sci U S A. 2002;99:15345-15350.

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Authors
Drake, J. C., Peelor, F. F., Biela, L. M., Watkins, M. K., Miller, R. A., Hamilton, K. L., & Miller, B. F.
Affiliations
  • Colorado State University (US)
  • University of Michigan (US)
Venue
The Journals of Gerontology Series A
Published
2013-05-08
Volume
68
Issue
12
Pages
1493-1501
ISSN
  • 1079-5006 (ISSN-L)
  • 1758-535X
OpenAlex
W2125650264
Cited by
87
References
42
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 4 · 2022: 6 · 2021: 8 · 2020: 11 · 2019: 6 · 2018: 8 · 2017: 10 · 2016: 6 · 2015: 14 · 2014: 7 · 2013: 2
FWCI
3.43
Type
journal article
Language
en
Open access
Locations
  • The Journals of Gerontology Series A (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5k01ag031829-03)
  • National Institute on Aging (1K01AG031829-01, P30AG013283, P30AG024824, U01AG022303)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
rapamycin, mTORC1 signaling, mitochondrial biogenesis, sex differences, protein synthesis, DNA synthesis, S6 phosphorylation, lifespan extension, skeletal muscle, heart, liver, chronic dietary supplementation, aging
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Animals, Antibiotics, Antineoplastic, Diet, Female, Longevity, Male, Mitochondria, Phosphorylation, Protein Biosynthesis, Signal Transduction, Deuterium Oxide, Muscle, Skeletal, Sirolimus, Ribosomal Protein S6, Multiprotein Complexes, Mice, TOR Serine-Threonine Kinases, Mitochondrial Turnover

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