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J Gerontol A Biol Sci Med Sci. 2015 Apr;70(4):410-20. doi: 10.1093/gerona/glu053. Epub 2014 Apr 22.

Rapamycin and dietary restriction induce metabolically distinctive changes in mouse liver.

Author information

  • 1Linus Pauling Institute, Oregon State University, Corvallis.
  • 2Department of Geriatric Medicine, Oklahoma University Health Science Center and Oklahoma City VA Medical Center.
  • 3Department of Chemistry and Biochemistry, University of Michigan-Flint.
  • 4Department of Molecular Medicine, Barshop Institute for Longevity and Aging Studies, and Audie Murphy VA Hospital, South Texas Veterans Health Care System, San Antonio, Texas.
  • 5Linus Pauling Institute, Oregon State University, Corvallis. Department of Biochemistry and Biophysics, Oregon State University, Corvallis. viviana.perez@oregonstate.edu.

Abstract

Dietary restriction (DR) is the gold standard intervention used to delay aging, and much recent research has focused on the identification of possible DR mimetics. Energy sensing pathways, including insulin/IGF1 signaling, sirtuins, and mammalian Target of Rapamycin (mTOR), have been proposed as pathways involved in the antiaging actions of DR, and compounds that affect these pathways have been suggested to act as DR mimetics, including metformin (insulin/IGF1 signaling), resveratrol (sirtuins), and rapamycin (mTOR). Rapamycin is a promising DR mimetic because it significantly increases both health span and life span in mice. Unfortunately, rapamycin also leads to some negative effects, foremost among which is the induction of insulin resistance, potentially limiting its translation into humans. To begin clarifying the mechanism(s) involved in insulin resistance induced by rapamycin, we compared several aspects of liver metabolism in mice treated with DR or rapamycin for 6 months. Our data suggest that although both DR and rapamycin inhibit lipogenesis, activate lipolysis, and increased serum levels of nonesterified fatty acids, only DR further activates β-oxidation of the fatty acids leading to the production of ketone bodies.

© The Author 2014. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

KEYWORDS:

Dietary restriction; Metabolites; Rapamycin; β-oxidation.

PMID:
24755936
[PubMed - indexed for MEDLINE]
PMCID:
PMC4447794
Free PMC Article
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