Cited by 553Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismMuscle Physiology and Disorders

Knockout of the α2 but Not α1 5′-AMP-activated Protein Kinase Isoform Abolishes 5-Aminoimidazole-4-carboxamide-1-β-4-ribofuranosidebut Not Contraction-induced Glucose Uptake in Skeletal Muscle

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Jørgensen, Sebastian B., Viollet, Benoit, Andreelli, Fabrizio, Frøsig, Christian, Birk, Jesper B., Schjerling, Peter, Vaulont, Sophie, Richter, Erik A. +1 more·2004·Journal of Biological Chemistry

Abstract

We investigated the importance of the two catalytic alpha-isoforms of the 5'-AMP-activated protein kinase (AMPK) in 5-aminoimidazole-4-carboxamide-1-beta-4-ribofuranoside (AICAR) and contraction-induced glucose uptake in skeletal muscle. Incubated soleus and EDL muscle from whole-body alpha2- or alpha1-AMPK knockout (KO) and wild type (WT) mice were incubated with 2.0 mm AICAR or electrically stimulated to contraction. Both AICAR and contraction increased 2DG uptake in WT muscles. KO of alpha2, but not alpha1, abolished AICAR-induced glucose uptake, whereas neither KO affected contraction-induced glucose uptake. AICAR and contraction increased alpha2- and alpha1-AMPK activity in wild type (WT) muscles. During AICAR stimulation, the remaining AMPK activity in KO muscles increased to the same level as in WT. During contraction, the remaining AMPK activity in alpha2-KO muscles was elevated by 100% probably explained by a 2-3-fold increase in alpha1-protein. In alpha1-KO muscles, alpha2-AMPK activity increased to similar levels as in WT. Both interventions increased total AMPK activity, as expressed by AMPK-P and ACCbeta-P, in WT muscles. During AICAR stimulation, this was dramatically reduced in alpha2-KO but not in alpha1-KO, whereas during contraction, both measurements were essentially similar to WT in both KO-muscles. The results show that alpha2-AMPK is the main donor of basal and AICAR-stimulated AMPK activity and is responsible for AICAR-induced glucose uptake. In contrast, during contraction, the two alpha-isoforms seem to substitute for each other in terms of activity, which may explain the normal glucose uptake despite the lack of either alpha2- or alpha1-AMPK. Alternatively, neither alpha-isoform of AMPK is involved in contraction-induced muscle glucose uptake.

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Crossref · 10.1074/jbc.m306205200

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  • AMPK α2, β2 and γ3 null and α2KD and β1β2 M-KO mice have normal insulin-stimulated glucose uptake in muscle.

    “In support of this, insulin also does not increase AMPK T172 or ACC S79/212 phosphorylation [74] and AMPK α2, β2 and γ3 null and α2KD and β1β2 M-KO mice have normal insulin-stimulated glucose uptake in muscle [26,28,30,36,100] despite blunted TBC1D1 PAS and T590 phosphorylation in response to insulin [30,74].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [26]

  • 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 [26]

  • Under basal conditions the α2 subunit rather than α1 subunit is required for AICAR-induced glucose uptake.

    “The α2 subunit of AMPK is required for AICAR-induced inhibitory effects of mTOR signaling in skeletal muscle [159], which is consistent with alternative findings that showing that under basal conditions the α2 subunit rather than α1 subunit is required for AICAR-induced glucose uptake [26].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [26]

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Authors
Jørgensen, S. B., Viollet, B., Andreelli, F., Frøsig, C., Birk, J. B., Schjerling, P., Vaulont, S., Richter, E. A., & Wojtaszewski, J. F. P.
Affiliations
  • University of Copenhagen (DK)
  • Rigshospitalet (DK)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
Jørgensen, Sebastian B.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-01
Volume
279
Issue
2
Pages
1070-1079
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2073361547
Cited by
553
References
44
Citations by year
2026: 7 · 2025: 8 · 2024: 5 · 2023: 7 · 2022: 10 · 2021: 16 · 2020: 24 · 2019: 11 · 2018: 16 · 2017: 23 · 2016: 30 · 2015: 33 · 2014: 23 · 2013: 30 · 2012: 38
FWCI
13.87
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
AMPK, AICAR, skeletal muscle glucose uptake, muscle contraction, AMPK knockout mice, soleus muscle, EDL muscle
MeSH terms
Aminoimidazole Carboxamide, Animals, Deoxyglucose, Dose-Response Relationship, Drug, Female, Glucose, Glucose Tolerance Test, Glycogen, Insulin, Male, Models, Genetic, Multienzyme Complexes, Muscles, Precipitin Tests, Ribonucleotides, Time Factors, Immunoblotting, Protein Serine-Threonine Kinases, Mice, Knockout, Muscle, Skeletal, Protein Isoforms, Mice, AMP-Activated Protein Kinases

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