Cited by 318Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismGlycogen Storage Diseases and Myoclonus

The 5′-AMP-activated Protein Kinase γ3 Isoform Has a Key Role in Carbohydrate and Lipid Metabolism in Glycolytic Skeletal Muscle

Open access
Barnes, Brian R., Marklund, Stefan, Steiler, Tatiana L., Walter, Mark, Hjälm,, Göran, Amarger, Valerie, Mahlapuu, Margit, Leng, Ying +7 more·2004·Journal of Biological Chemistry

Abstract

5'-AMP-activated protein kinase (AMPK) is a metabolic stress sensor present in all eukaryotes. A dominant missense mutation (R225Q) in pig PRKAG3, encoding the muscle-specific gamma3 isoform, causes a marked increase in glycogen content. To determine the functional role of the AMPK gamma3 isoform, we generated transgenic mice with skeletal muscle-specific expression of wild type or mutant (225Q) mouse gamma3 as well as Prkag3 knockout mice. Glycogen resynthesis after exercise was impaired in AMPK gamma3 knock-out mice and markedly enhanced in transgenic mutant mice. An AMPK activator failed to increase skeletal muscle glucose uptake in AMPK gamma3 knock-out mice, whereas contraction effects were preserved. When placed on a high fat diet, transgenic mutant mice but not knock-out mice were protected against excessive triglyceride accumulation and insulin resistance in skeletal muscle. Transfection experiments reveal the R225Q mutation is associated with higher basal AMPK activity and diminished AMP dependence. Our results validate the muscle-specific AMPK gamma3 isoform as a therapeutic target for prevention and treatment of insulin resistance.

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Crossref · 10.1074/jbc.m405533200

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  • Transgenic mice harboring the R225Q mutation in AMPK γ3 subunit have higher AMPK activity and glycogen levels and are protected from diet-induced insulin resistance.

    “Interestingly, transgenic mice harboring the R225Q mutation in AMPK γ3 subunit have higher AMPK activity and glycogen levels and are protected from diet-induced insulin resistance [4], which is a likely effect of increased fatty acid oxidation and subsequent reduction in skeletal muscle lipids.”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [4]

  • Whole-body γ3 KO mice have normal insulin sensitivity under basal conditions and glucose uptake during exercise.

    “Whole-body γ3 KO mice have reduced AMPK activity at rest, during exercise and in response to fasting, but normal insulin sensitivity under basal conditions and glucose uptake during exercise [4,41].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [4]

  • Whole-body γ3 KO mice have reduced AMPK activity at rest, during exercise and in response to fasting.

    “Whole-body γ3 KO mice have reduced AMPK activity at rest, during exercise and in response to fasting, but normal insulin sensitivity under basal conditions and glucose uptake during exercise [4,41].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [4]

  • Contraction-mediated glucose uptake was normal in β2 or γ3 KO mice.

    “Although TBC1D1 expression or PAS phosphorylation was not assessed in skeletal muscle from β2 or γ3 KO mice, contraction-mediated glucose uptake was also normal [4,28], suggesting that the remaining subunit isoforms (likely contributing to maintained or elevated α1 AMPK activity) was sufficient to allow for normal glucose uptake.”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [4]

  • AMPK α2 KO and α2 KD and α2iTg mice have normal or only modest reductions in glucose uptake during contractions.

    “AMPK α2 KO and α2 KD and α2iTg mice have normal or only modest reductions in glucose uptake during contractions [4,26,31,32,118-120].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [4]

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Authors
Barnes, B. R., Marklund, S., Steiler, T. L., Walter, M., Hjälm, Amarger, V., Mahlapuu, M., Leng, Y., Johansson, C., Galuska, D., Lindgren, K., Åbrink, M., Stapleton, D., Zierath, J. R., & Andersson, L.
Affiliations
  • Karolinska Institutet (SE)
  • Swedish University of Agricultural Sciences (SE)
  • Uppsala University (SE)
Corresponding author
  • Zierath, Juleen R.
  • Andersson, Leif
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-09
Volume
279
Issue
37
Pages
38441-38447
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2147553969
Cited by
317
References
37
Citations by year
2026: 5 · 2025: 3 · 2024: 9 · 2023: 7 · 2022: 4 · 2021: 8 · 2020: 15 · 2019: 15 · 2018: 9 · 2017: 14 · 2016: 21 · 2015: 17 · 2014: 21 · 2013: 17 · 2012: 10
FWCI
6.87
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
Funders
  • Svenska Forskningsrådet Formas
  • Karolinska Institutet
  • Vetenskapsrådet
  • Uppsala Universitet
  • Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Rheumatology › Glycogen Storage Diseases and Myoclonus
Keywords
AMPK, PRKAG3, skeletal muscle, glycogen resynthesis, physical activity, skeletal muscle glucose uptake, triglyceride accumulation, insulin resistance, high-fat diet, carbohydrate metabolism, lipid metabolism
MeSH terms
Animals, Blood Glucose, Glucose, Glycogen, Glycolysis, Insulin, Mice, Transgenic, Models, Genetic, Multienzyme Complexes, Protein Kinases, RNA, Messenger, Swine, Temperature, Transfection, Triglycerides, Protein Serine-Threonine Kinases, DNA, Complementary, Mice, Knockout, Muscle, Skeletal, COS Cells, Protein Isoforms, Mutation, Missense, Reverse Transcriptase Polymerase Chain Reaction, Lipid Metabolism, Mice, AMP-Activated Protein Kinases

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