Cited by 72Metabolism, Diabetes, and CancerMuscle metabolism and nutritionGlycogen Storage Diseases and Myoclonus

Effect of acute activation of 5′-AMP-activated protein kinase on glycogen regulation in isolated rat skeletal muscle

Miyamoto, Licht, Toyoda, Taro, Hayashi, Tatsuya, Yonemitsu, Shin, Nakano, Masako, Tanaka, Satsuki, Ebihara, Ken, Masuzaki, Hiroaki +5 more·2007·Journal of Applied Physiology

Abstract

5′-AMP-activated protein kinase (AMPK) has been implicated in glycogen metabolism in skeletal muscle. However, the physiological relevance of increased AMPK activity during exercise has not been fully clarified. This study was performed to determine the direct effects of acute AMPK activation on muscle glycogen regulation. For this purpose, we used an isolated rat muscle preparation and pharmacologically activated AMPK with 5-aminoimidazole-4-carboxamide-1-β-d-ribonucleoside (AICAR). Tetanic contraction in vitro markedly activated the α 1- and α 2-isoforms of AMPK, with a corresponding increase in the rate of 3- O-methylglucose uptake. Incubation with AICAR elicited similar enhancement of AMPK activity and 3- O-methylglucose uptake in rat epitrochlearis muscle. In contrast, whereas contraction stimulated glycogen synthase (GS), AICAR treatment decreased GS activity. Insulin-stimulated GS activity also decreased after AICAR treatment. Whereas contraction activated glycogen phosphorylase (GP), AICAR did not alter GP activity. The muscle glycogen content decreased in response to contraction but was unchanged by AICAR. Lactate release was markedly increased when muscles were stimulated with AICAR in buffer containing glucose, indicating that the glucose taken up into the muscle was catabolized via glycolysis. Our results suggest that AMPK does not mediate contraction-stimulated glycogen synthesis or glycogenolysis in skeletal muscle and also that acute AMPK activation leads to an increased glycolytic flux by antagonizing contraction-stimulated glycogen synthesis.

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Crossref · 10.1152/japplphysiol.01034.2006

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  • Phosphorylation of GS at site 2 (S7) by AMPK inhibits enzyme activity in isolated muscles treated with AICAR.

    “This inhibits enzyme activity in isolated muscles treated with AICAR [133-135].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [133]

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Authors
Miyamoto, L., Toyoda, T., Hayashi, T., Yonemitsu, S., Nakano, M., Tanaka, S., Ebihara, K., Masuzaki, H., Hosoda, K., Ogawa, Y., Inoue, G., Fushiki, T., & Nakao, K.
Affiliations
Kyoto University (JP)
Venue
Journal of Applied Physiology
Published
2007-03
Volume
102
Issue
3
Pages
1007-1013
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2168961260
Cited by
72
References
50
Citations by year
2026: 1 · 2025: 1 · 2024: 3 · 2021: 1 · 2020: 2 · 2019: 4 · 2018: 5 · 2017: 2 · 2016: 8 · 2015: 5 · 2014: 5 · 2013: 5 · 2012: 7
FWCI
1.77
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Rheumatology › Glycogen Storage Diseases and Myoclonus
Keywords
AMPK, skeletal muscle glycogen, glycogen synthase, glycogen phosphorylase, AICAR, muscle contraction, glycolytic flux, lactate release, epitrochlearis muscle, physical activity
MeSH terms
Adenosine Triphosphate, Aminoimidazole Carboxamide, Animals, Dose-Response Relationship, Drug, Enzyme Activation, Glucose, Glycogen, Glycogen Synthase, Glycolysis, Insulin, Male, Multienzyme Complexes, Muscle Contraction, Ribonucleosides, Ribonucleotides, Time Factors, Rats, Sprague-Dawley, Protein Serine-Threonine Kinases, Muscle, Skeletal, Lactic Acid, Glycogen Phosphorylase, Rats, AMP-Activated Protein Kinases, In Vitro Techniques

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