Long-term caloric restriction activates the myocardial SIRT1/ AMPK/PGC-1α pathway in C57BL/6J male mice

  • Lina Ma
  • Rong Wang
  • Hongjuan Wang
  • Yaxin Zhang
  • Zhiwei Zhao
Keywords: caloric restriction, signaling pathway, SIRT1, AMPK, mTOR

Abstract

Background: Caloric restriction (CR) can help in improving heart function. There is as yet no consensus on the mechanism of the effect of CR. Silent mating-type information regulation 1 (SIRT1), adenosine monophosphate- activated protein kinase (AMPK), and mTOR are key players in metabolic stress management. We aimed to explore the effect of CR on the myocardial SIRT1/AMPK/mTOR pathway in mice.

Methods: Thirty-six 6-week-old male C57BL/6J mice were randomly divided into three groups: normal control group (NC group, n = 12), high-energy group (HE group, n = 12) and CR group (n = 12) according to different diets. After 11 months, western blot was used to examine proteins such as p-AMPK, peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), SIRT1, and p-mTOR, whereas real-time PCR was used to examine the expression of AMPK, PGC-1α, and SIRT1 transcripts.

Results: Compared to the HE group, the CR group displayed increased expression of myocardial p-AMPK protein, SIRT1 protein and mRNA, and PGC-1a mRNA. However, no difference was observed in the expression of p-mTOR protein and mTOR mRNA in the myocardium among the three groups.

Conclusions: CR improves the SIRT1/AMPK/PGC-1α pathway in mice myocardium with no effect on the mTOR pathway.

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References


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Published
2020-01-29
How to Cite
1.
Ma L, Wang R, Wang H, Zhang Y, Zhao Z. Long-term caloric restriction activates the myocardial SIRT1/ AMPK/PGC-1α pathway in C57BL/6J male mice. fnr [Internet]. 2020Jan.29 [cited 2020Apr.9];64. Available from: https://foodandnutritionresearch.net/index.php/fnr/article/view/3668
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