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Pflügers Archiv - European Journal of Physiology

, Volume 470, Issue 11, pp 1633–1645 | Cite as

Training state and fasting-induced PDH regulation in human skeletal muscle

  • Anders Gudiksen
  • Lærke Bertholdt
  • Tomasz Stankiewicz
  • Ida Villesen
  • Jens Bangsbo
  • Peter Plomgaard
  • Henriette Pilegaard
Muscle physiology
  • 117 Downloads
Part of the following topical collections:
  1. Muscle physiology

Abstract

The aim of the present study was to examine the influence of training state on fasting-induced skeletal muscle pyruvate dehydrogenase (PDH) regulation, including PDH phosphorylation. Trained and untrained subjects, matched for skeletal muscle CS activity and OXPHOS protein, fasted for 36 h after receiving a standardized meal. Respiratory exchange ratio (RER) was measured and blood as well as vastus lateralis muscle biopsies were obtained 2, 12, 24, and 36 h after the meal. RER decreased with fasting only in untrained individuals, while PDHa activity decreased from 12 h after the meal in untrained, but only tended to decrease at 36 h in trained. PDH-E1α, PDP1 protein, PDH phosphorylation, and PDH acetylation in skeletal muscle was higher in trained than untrained subjects, but did not change with fasting, while PDK4 protein was higher at 36 h than at 2 h after the meal in both groups. In conclusion, the present results suggest that endurance exercise training modifies the fasting-induced regulation of PDHa activity in skeletal muscle and the substrate switch towards fat oxidation. PDH phosphorylation could not explain the fasting-induced regulation of PDHa activity suggesting other post translational modifications.

Keywords

Pyruvate dehydrogenase Skeletal muscle Acetylation Phosphorylation Fasting Exercise training 

Notes

Acknowledgements

We would like to thank the involved subjects for participation in the study.

Funding information

This study was funded by the Danish Ministry of Culture for Sports Research (1095421001), the Danish Council for Independent Research (36723-104353), and the Danish Diabetes Academy (1105701001). The Centre for Physical Activity Research is supported by a grant from TrygFonden, and the Centre of Inflammation and Metabolism was supported by a grant from the Danish National Research Foundation (DNRF55).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Section for Cell Biology and Physiology, Department of BiologyUniversity of CopenhagenCopenhagenDenmark
  2. 2.Section of Integrative Physiology, Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
  3. 3.Department of Clinical Biochemistry, Rigshospitalet, Centre of Inflammation and Metabolism and Centre for Physical Activity ResearchUniversity of CopenhagenCopenhagenDenmark

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