Abstract
Calorie restriction (CR) may extend longevity by modulating the mechanisms involved in aging. Different hypotheses have been proposed for its main mode of action. We quantified hepatic transcripts of male C57BL/6 mice exposed to graded levels of CR (0% to 40% CR) for three months, and evaluated the responses relative to these various hypotheses. Of the four main signaling pathways implied to be linked to the impact of CR on lifespan (insulin/insulin like growth factor 1 (IGF-1), nuclear factor-kappa beta (NF-ĸB), mechanistic target of rapamycin (mTOR) and sirtuins (SIRTs)), all the pathways except SIRT were altered in a manner consistent with increased lifespan. However, the expression levels of SIRT4 and SIRT7 were decreased with increasing levels of CR. Changes consistent with altered fuel utilization under CR may reduce reactive oxygen species production, which was paralleled by reduced protection. Downregulated major urinary protein (MUP) transcription suggested reduced reproductive investment. Graded CR had a positive effect on autophagy and xenobiotic metabolism, and was protective with respect to cancer signaling. CR had no significant effect on fibroblast growth factor-21 (FGF21) transcription but affected transcription in the hydrogen sulfide production pathway. Responses to CR were consistent with several different hypotheses, and the benefits of CR on lifespan likely reflect the combined impact on multiple aging related processes.
Original language | English |
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Pages (from-to) | 1770-1824 |
Number of pages | 55 |
Journal | Aging |
Volume | 9 |
Issue number | 7 |
DOIs | |
Publication status | Published - 31 Jul 2017 |
Bibliographical note
We would like to acknowledge the BSU staff for their invaluable help with caring for the animals.Keywords
- aging
- calorie restriction
- gene expression
- liver
- transcriptomics
- NF-KAPPA-B
- SHORT-TERM CALORIE
- RAT-LIVER MITOCHONDRIA
- GROWTH-FACTOR-I
- GENETICALLY HETEROGENEOUS MICE
- OXIDATIVE DNA-DAMAGE
- AGE-RELATED-CHANGES
- CANCER STEM-CELLS
- DIETARY RESTRICTION
- GENE-EXPRESSION
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Davina Derous
- Biological Sciences, Aberdeen Centre For Environmental Sustainability - Senior Research Fellow
Person: Academic Related - Research
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Centre for Genome-Enabled Biology and Medicine
Elaina Susan Renata Collie-Duguid (Manager)
School of Medicine, Medical Sciences & NutritionResearch Facilities: Facility