The effects of graded levels of calorie restriction: VI. Impact of short-term graded calorie restriction on transcriptomic responses of the hypothalamic hunger and circadian signaling pathways

Davina Derous, Sharon E. Mitchell, Cara L. Green, Luonan Chen, Jing-Dong J. Han, Yingchun Wang, Daniel E. L. Promislow, David Lusseau, John R. Speakman (Corresponding Author), Alex Douglas (Corresponding Author)

Research output: Contribution to journalArticle

15 Citations (Scopus)
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Abstract

Food intake and circadian rhythms are regulated by hypothalamic neuropeptides and circulating hormones, which could mediate the anti-ageing effect of calorie restriction (CR). We tested whether these two signaling pathways mediate CR by quantifying hypothalamic transcripts of male C57BL/6 mice exposed to graded levels of CR (10 % to 40 %) for 3 months. We found that the graded CR manipulation resulted in upregulation of core circadian rhythm genes, which correlated negatively with circulating levels of leptin, insulin-like growth factor 1 (IGF-1), insulin, and tumor necrosis factor alpha (TNF-α). In addition, key components in the hunger signaling pathway were expressed in a manner reflecting elevated hunger at greater levels of restriction, and which also correlated negatively with circulating levels of insulin, TNF-α, leptin and IGF-1. Lastly, phenotypes, such as food anticipatory activity and body temperature, were associated with expression levels of both hunger genes and core clock genes. Our results suggest modulation of the hunger and circadian signaling pathways in response to altered levels of circulating hormones, that are themselves downstream of morphological changes resulting from CR treatment, may be important elements in the response to CR, driving some of the key phenotypic outcomes.
Original languageEnglish
Pages (from-to)642-661
Number of pages20
JournalAging
Volume8
Issue number4
Early online date23 Feb 2016
DOIs
Publication statusPublished - Apr 2016

Keywords

  • calorie restriction
  • circadian rhythm
  • hunger
  • Hypothalamus
  • transcriptomics

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