AMPKα is essential for acute exercise-induced gene responses but not for exercise training-induced adaptations in mouse skeletal muscle
| Autor: | Joachim Fentz, Marc Foretz, Jørgen F. P. Wojtaszewski, Benoit Viollet, Caroline Maag Kristensen, Rasmus Kjøbsted, Janne R. Hingst, Anders Gudiksen, Peter Schjerling, Henriette Pilegaard, Jesper B. Birk |
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| Rok vydání: | 2015 |
| Předmět: |
medicine.medical_specialty
Time Factors Physiology Endocrinology Diabetes and Metabolism Protein subunit Muscle Proteins AMP-Activated Protein Kinases Motor Activity Random Allocation AMP-activated protein kinase Physiology (medical) Internal medicine medicine Animals Citrate synthase RNA Messenger Phosphorylation Muscle Skeletal Protein kinase A Crosses Genetic Mice Knockout biology Glucose transporter AMPK Skeletal muscle Mitochondria Muscle Up-Regulation Transport protein Endocrinology medicine.anatomical_structure Gene Expression Regulation Allostasis biology.protein Female Protein Processing Post-Translational |
| Zdroj: | American Journal of Physiology-Endocrinology and Metabolism. 309:E900-E914 |
| ISSN: | 1522-1555 0193-1849 |
| DOI: | 10.1152/ajpendo.00157.2015 |
| Popis: | Exercise training increases skeletal muscle expression of metabolic proteins improving the oxidative capacity. Adaptations in skeletal muscle by pharmacologically induced activation of 5′-AMP-activated protein kinase (AMPK) are dependent on the AMPKα2 subunit. We hypothesized that exercise training-induced increases in exercise capacity and expression of metabolic proteins, as well as acute exercise-induced gene regulation, would be compromised in muscle-specific AMPKα1 and -α2 double-knockout (mdKO) mice. An acute bout of exercise increased skeletal muscle mRNA content of cytochrome c oxidase subunit I, glucose transporter 4, and VEGF in an AMPK-dependent manner, whereas cluster of differentiation 36 and fatty acid transport protein 1 mRNA content increased similarly in AMPKα wild-type (WT) and mdKO mice. During 4 wk of voluntary running wheel exercise training, the AMPKα mdKO mice ran less than WT. Maximal running speed was lower in AMPKα mdKO than in WT mice but increased similarly in both genotypes with exercise training. Exercise training increased quadriceps protein content of ubiquinol-cytochrome c reductase core protein 1 (UQCRC1), cytochrome c, hexokinase II, plasma membrane fatty acid-binding protein, and citrate synthase activity more in AMPKα WT than in mdKO muscle. However, analysis of a subgroup of mice matched for running distance revealed that only UQCRC1 protein content increased more in WT than in mdKO mice with exercise training. Thus, AMPKα1 and -α2 subunits are important for acute exercise-induced mRNA responses of some genes and may be involved in regulating basal metabolic protein expression but seem to be less important in exercise training-induced adaptations in metabolic proteins. |
| Databáze: | OpenAIRE |
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