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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Physiol. | doi: 10.3389/fphys.2019.01432

Every-other-day feeding decreases glycolytic and mitochondrial energy-producing potentials in the brain and liver of young mice

 Volodymyr I. Lushchak1*,  Maria M. Bayliak2, Dmytro V. Gospodaryov1, Yulia V. Vasylyk1, Oksana V. Kuzniak1, Tetiana M. Pankiv M. Pankiv1,  Olga Garaschuk3 and Kenneth B. Storey4
  • 1Vasyl Stefanyk Precarpathian National University, Ukraine
  • 2Vasyl Stefanyk Subcarpathian National University, Ukraine
  • 3University of Tübingen, Germany
  • 4Carleton University, Canada

Intermittent fasting is used to reduce body mass in obese adult humans and animals. However, information on the impact of one type of intermittent fasting (IF) called every-other-day feeding (EODF) on young animals is scarce. In this study, one-month-old mice of both sexes were subjected to a four week regimen of EODF using age-matched counterparts fed ad libitum as controls. At the end of EODF exposure, experimental male and female mice weighed 14% and 13% less than the control counterparts. The EODF regimen resulted in lower liver levels of glycogen, glucose, and lactate, but did not affect lactate level in mouse cerebral cortex of both sexes. Activities of key glycolytic enzymes (hexokinase, phosphofructokinase, pyruvate kinase) in liver of experimental mice were lower than those in controls. In the cerebral cortex only hexokinase and pyruvate kinase activities were lower than in controls, but phosphofructokinase activity was not affected in IF females and was higher in IF males as compared with ad libitum fed males. Mitochondria isolated from liver of IF mice had lower respiratory control ratios, but those from the cortex had the same value as control animals. The concentration of beta-hydroxybutyrate and the activity of beta-hydroxybutyrate dehydrogenase were lower in the IF mouse liver, but not changed or enhanced in the IF cerebral cortex. Thus, animal responses to IF do not depend significantly on sex and are directed to decrease energy metabolism to save resources, and the effects are more pronounced in the liver than in the brain.

Keywords: glycolytic enzymes, electron transport chain, mitochondrial respiration, Ketone Bodies, Pentose Phosphate Pathway

Received: 03 Jun 2019; Accepted: 04 Nov 2019.

Copyright: © 2019 Lushchak, Bayliak, Gospodaryov, Vasylyk, Kuzniak, Pankiv, Garaschuk and Storey. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Volodymyr I. Lushchak, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivs’k, Ukraine, vlushchak@ukr.net