Cited by 39Peroxisome Proliferator-Activated ReceptorsMetabolism, Diabetes, and CancerAdipose Tissue and Metabolism

Glycogen Content Regulates Peroxisome Proliferator Activated Receptor-∂ (PPAR-∂) Activity in Rat Skeletal Muscle

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Philp, Andrew, MacKenzie, Matthew G., Belew, Micah Y., Towler, Mhairi C., Corstorphine, Alan, Papalamprou, Angela, Hardie, D. Grahame, Baar, Keith·2013·PLoS ONE

Abstract

Performing exercise in a glycogen depleted state increases skeletal muscle lipid utilization and the transcription of genes regulating mitochondrial β-oxidation. Potential candidates for glycogen-mediated metabolic adaptation are the peroxisome proliferator activated receptor (PPAR) coactivator-1α (PGC-1α) and the transcription factor/nuclear receptor PPAR-∂. It was therefore the aim of the present study to examine whether acute exercise with or without glycogen manipulation affects PGC-1α and PPAR-∂ function in rodent skeletal muscle. Twenty female Wistar rats were randomly assigned to 5 experimental groups (n = 4): control [CON]; normal glycogen control [NG-C]; normal glycogen exercise [NG-E]; low glycogen control [LG-C]; and low glycogen exercise [LG-E]). Gastrocnemius (GTN) muscles were collected immediately following exercise and analyzed for glycogen content, PPAR-∂ activity via chromatin immunoprecipitation (ChIP) assays, AMPK α1/α2 kinase activity, and the localization of AMPK and PGC-1α. Exercise reduced muscle glycogen by 47 and 75% relative to CON in the NG-E and LG-E groups, respectively. Exercise that started with low glycogen (LG-E) finished with higher AMPK-α2 activity (147%, p<0.05), nuclear AMPK-α2 and PGC-1α, but no difference in AMPK-α1 activity compared to CON. In addition, PPAR-∂ binding to the CPT1 promoter was significantly increased only in the LG-E group. Finally, cell reporter studies in contracting C2C12 myotubes indicated that PPAR-∂ activity following contraction is sensitive to glucose availability, providing mechanistic insight into the association between PPAR-∂ and glycogen content/substrate availability. The present study is the first to examine PPAR-∂ activity in skeletal muscle in response to an acute bout of endurance exercise. Our data would suggest that a factor associated with muscle contraction and/or glycogen depletion activates PPAR-∂ and initiates AMPK translocation in skeletal muscle in response to exercise.

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  • AMPK can translocate to the nucleus where it regulates histone deacetylases, transcription factors and transcriptional co-activators such as HDAC5, MEF2 and PGC-1α.

    “In a feed forward fashion AMPK can translocate to the nucleus [24,27] where it regulates Histone de-aceytlases, transcription factors and transcriptional co-activators such as histone deacetylase 5 (HDAC5), myocyte enhancing factor 2 (MEF2) and peroxisome proliferator activated receptor-γ co-activator-1α (PGC-1α) respectively (Figure 1) [28][29][30].”
  • In rodent studies, when exercise occurs in the low glycogen state, AMPK nuclear content is increased.

    “Interestingly, in rodent studies when exercise occurs in the low glycogen state AMPK nuclear content is increased [24].”

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Authors
Philp, A., MacKenzie, M. G., Belew, M. Y., Towler, M. C., Corstorphine, A., Papalamprou, A., Hardie, D. G., & Baar, K.
Affiliations
  • University of Dundee (GB)
  • University of California, Davis (US)
Corresponding author
Baar, Keith
Venue
PLoS ONE
Published
2013-10-17
Volume
8
Issue
10
Pages
e77200
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2043398384
Cited by
39
References
44
Citations by year
2022: 3 · 2021: 3 · 2020: 5 · 2019: 3 · 2018: 5 · 2017: 5 · 2016: 6 · 2015: 2 · 2014: 7
FWCI
2.24
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Discovery Research Portal (University of Dundee) (acceptedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
Wellcome Trust (097726)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
PPARδ, skeletal muscle glycogen, glycogen depletion, acute exercise, AMPK, PGC-1α, endurance exercise, muscle contraction, glucose availability, lipid metabolism, gastrocnemius
MeSH terms
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Animals, Cell Line, Enzyme Activation, Female, Glucose, Glycogen, Physical Conditioning, Animal, Transcription Factors, Muscle, Skeletal, Peroxisome Proliferator-Activated Receptors, Rats, AMP-Activated Protein Kinases

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