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Selective activation of AMPK‐PGC‐1α or PKB‐TSC2‐mTOR signaling can explain specific adaptive responses to endurance or resistance training‐like electrical muscle stimulation
Abstract
Endurance training induces a partial fast-to-slow muscle phenotype transformation and mitochondrial biogenesis but no growth. In contrast, resistance training mainly stimulates muscle protein synthesis resulting in hypertrophy. The aim of this study was to identify signaling events that may mediate the specific adaptations to these types of exercise. Isolated rat muscles were electrically stimulated with either high frequency (HFS; 6x10 repetitions of 3 s-bursts at 100 Hz to mimic resistance training) or low frequency (LFS; 3 h at 10 Hz to mimic endurance training). HFS significantly increased myofibrillar and sarcoplasmic protein synthesis 3 h after stimulation 5.3- and 2.7-fold, respectively. LFS had no significant effect on protein synthesis 3 h after stimulation but increased UCP3 mRNA 11.7-fold, whereas HFS had no significant effect on UCP3 mRNA. Only LFS increased AMPK phosphorylation significantly at Thr172 by approximately 2-fold and increased PGC-1alpha protein to 1.3 times of control. LFS had no effect on PKB phosphorylation but reduced TSC2 phosphorylation at Thr1462 and deactivated translational regulators. In contrast, HFS acutely increased phosphorylation of PKB at Ser473 5.3-fold and the phosphorylation of TSC2, mTOR, GSK-3beta at PKB-sensitive sites. HFS also caused a prolonged activation of the translational regulators p70 S6k, 4E-BP1, eIF-2B, and eEF2. These data suggest that a specific signaling response to LFS is a specific activation of the AMPK-PGC-1alpha signaling pathway which may explain some endurance training adaptations. HFS selectively activates the PKB-TSC2-mTOR cascade causing a prolonged activation of translational regulators, which is consistent with increased protein synthesis and muscle growth. We term this behavior the "AMPK-PKB switch." We hypothesize that the AMPK-PKB switch is a mechanism that partially mediates specific adaptations to endurance and resistance training, respectively.
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“endurance exercise studies with rodents and humans have shown AMPK signaling and mRNAs involved in mitochondrial biogenesis increase hours following exercise (Fujii et al., 2000; Atherton et al., 2005; Jorgensen et al., 2005)”
From Skeletal Muscle Ribosome and Mitochondrial Biogenesis in Response to Different Exercise Training Modalities (2021) · cites this paper as Atherton et al., 2005
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“endurance), rather than the nutrition intervention, plays a more dominant role in the divergent signalling pathways and the types of proteins that are synthesized after exercise, which explains the adaptive response and divergent phenotypes (Atherton et al , 2005 ).”
BackgroundRegulatory mechanisms of skeletal muscle protein turnover during exercise
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“Aerobic training is shown to regulate the AMPK-TSC2 molecules, inhibiting protein synthesis through the downregulation of mTOR (Atherton et al., 2005), while strength training activates the PI3K-Akt-mTOR pathway, leading to proteins synthesis and muscle growth (Coffey and Hawley, 2007).”
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“In the former, activation of the Ser/Thr kinase AKT enhances protein synthesis [9], ultimately causing hypertrophy especially of glycolytic fibers (type II fibers) [10].”
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“Yet, there have been attempts to identify single signaling cascades or molecules that could work as a master regulator for controlling exercise-specific adaptations (Atherton et al. 2005; Baar and Esser 1999).”
BackgroundRole of Akt2 in contraction-stimulated cell signaling and glucose uptake in skeletal muscle
Sakamoto, K., Arnolds, D. E., Fujii, N., Kramer, H. F., Hirshman, M. F., & Goodyear, L. J. (2006) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.00204.2006 · Cited by 63
“Although early studies suggested that Akt was not activated by either contraction (2, 25, 39) or physical exercise (26, 46, 48), more recent data from our laboratory and those of others have convincingly shown that Akt is activated by exercise and contraction in both rodent (3, 28, 30, 34, 36) and human skeletal muscl…”
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“The metabolic demand associated with sustained aerobic exercise increases AMPK phosphorylation, which appears to be an upstream intracellular regulator of PGC-1a activity (43,44), because AMPK directly phosphorylates PGC1a (45).”
BackgroundImprovement of obesity-linked skeletal muscle insulin resistance by strength and endurance training
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“…simulating strength and endurance training in isolated rat extensor digitorum longus and soleus muscles, showed selective activation of the Akt-mTOR signaling cascade with the strength and preferential activation of AMPK-PGC-1 α signaling with the endurance protocol (Atherton et al. 2005).”
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“Thus, the selective activation of these two molecular sensors contributes to divergent adaptations occurring in human skeletal muscle in response to strength and endurance activities (Atherton et al. 2005).”
BackgroundRamis, T. R., Muller, C. H. D. L., Boeno, F. P., Teixeira, B. C., Rech, A., Pompermayer, M. G., Medeiros, N. D. S., Reischak-Oliveira, Á., Pinto, R. S., & Ribeiro, J. L. (2018) · The Journal of Strength and Conditioning Research · doi:10.1519/jsc.0000000000002717 · Cited by 63
“The Akt promotes the activation of mTOR and GSK-3B (glycogen synthase kinase-3B) both inducing skeletal muscle hypertrophy (4).”
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“These results indicated that EA offers a beneficial effect on insulin resistance in obese and diabetic db/db mice, at least partly, via stimulation of SIRT1/PGC-1α, thus resulting in improved insulin signal.”
BackgroundMolecular Adaptations to Concurrent Training
de Souza, E., Tricoli, V., Roschel, H., Brum, P. C., Bacurau, A. V. N., Ferreira, J. C. B., Aoki, M. S., Neves, M., Aihara, A. Y., Fernandes, A. D. R. C., et al. (2012) · International Journal of Sports Medicine · doi:10.1055/s-0032-1312627 · Cited by 68
“This hypothesis suggests that CT may simultaneously activate competing intracellular pathways, resulting in interference between the strength and endurance training-induced adaptations [ 2 , 8 , 32 ] . post-test when compared to C (CT = 6.1 ± 0.58 %; IT = 8.3 ± 0.88 %; ST = 3.2 ± 0.66 %).”
BackgroundInfluentialThe Rationale for Consuming Protein Blends in Sports Nutrition
Paul, G. L. (2009) · Journal of the American College of Nutrition · doi:10.1080/07315724.2009.10718113 · Cited by 60
Exercise- and nutrient-controlled mechanisms involved in maintenance of the musculoskeletal mass
Rennie, M. J. (2007) · Biochemical Society Transactions · doi:10.1042/bst0351302 · Cited by 60
Akt/protein kinase B in skeletal muscle physiology and pathology
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“Similarly, Akt is rapidly activated by muscle contraction suggesting that it may play a role in contraction-induced muscle glucose uptake and protein synthesis (Atherton et al., 2005; Bruss et al., 2005; Arias et al., 2007; Katta et al., 2009b; Wu et al., 2009b).”
BackgroundInfluentialMurase, T., Haramizu, S., Ota, N., & Hase, T. (2008) · American Journal of Physiology-Regulatory, Integrative and Comparative Physiology · doi:10.1152/ajpregu.00880.2007 · Cited by 59
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“Opposing roles for these two training modes on mTOR activation are not surprising given the highly contrasting nature of muscle adaptations resulting from endurance and resistance exercise (Atherton et al. 2005, Coffey & Hawley 2007).”
InfluentialFerulic acid regulates muscle fiber type formation through the Sirt1/AMPK signaling pathway
Chen, X., Guo, Y., Jia, G., Zhao, H. Y., Liu, G., & Huang, Z. (2018) · Food & Function · doi:10.1039/c8fo01902a · Cited by 60
Hanatani, S., Izumiya, Y., Araki, S., Rokutanda, T., Kimura, Y., Walsh, K., & Ogawa, H. (2014) · Journal of the American Society of Nephrology · doi:10.1681/asn.2013091025 · Cited by 58
Atherton, P. J., Szewczyk, N. J., Selby, A., Rankin, D., Hillier, K., Smith, K., Rennie, M. J., & Loughna, P. T. (2009) · The Journal of Physiology · doi:10.1113/jphysiol.2009.169854 · Cited by 58
“After exercise, the rebound of MPS is associated with upregulated anabolic signalling through the classic ‘anabolic’ signalling cascade (PKB/Akt–mTORC1) (Atherton et al. 2005; Kumar et al. 2009a).”
Backgroundda Rocha, A. L., Pereira, B. C., Pauli, J. R., de Souza, C. T., Teixeira, G. R., Lira, F. S., Cintra, D. E., Ropelle, E. R., Júnior, C. R. B., & da Silva, A. S. R. (2015) · Journal of Cellular Physiology · doi:10.1002/jcp.25197 · Cited by 58
“In accordance, Atherton et al. (2005) showed that lowfrequency stimulation had no effect on pAkt, but reduced pTSC2 (Thr1462) in mixed EDL and soleus samples.”
BackgroundDuan, J., Yin, Y., Cui, J., Yan, J., Zhu, Y., Guan, Y., Wei, G., Weng, Y., Wu, X., Guo, C., et al. (2015) · Molecular Neurobiology · doi:10.1007/s12035-014-9033-x · Cited by 57
Matsakas, A., & Patel, K. (2009) · PubMed · doi:10.14670/hh-24.209 · Cited by 57
Molecular aspects of the exercise response and training adaptation in skeletal muscle
Furrer, R., & Handschin, C. (2024) · Free Radical Biology and Medicine · doi:10.1016/j.freeradbiomed.2024.07.026 · Cited by 68
The effect of concurrent training organisation in youth elite soccer players
Enright, K. J., Morton, J. P., Iga, J., & Drust, B. (2015) · European Journal of Applied Physiology · doi:10.1007/s00421-015-3218-5 · Cited by 57
“…training intensities (Docherty and Sporer, 2000), an incompatible hormonal (Bell et al., 2000) and (or) molecular signalling environment (Atherton et al., 2005) the ‘sequence’ or ‘order’ of training (Chtaha et al., 2008), the recovery time between training bouts (Craig et al., 1991) and…”
BackgroundThe role of the neural stimulus in regulating skeletal muscle hypertrophy
Alix‐Fages, C., Vecchio, A. D., Baz-Valle, E., Santos‐Concejero, J., & Balsalobre‐Fernández, C. (2022) · European Journal of Applied Physiology · doi:10.1007/s00421-022-04906-6 · Cited by 54
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Cachectic skeletal muscle response to a novel bout of low-frequency stimulation
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“Contraction-induced activation of AMPK is associated with increased PGC-1 protein expression (2).”
Diet, energy metabolism and mitochondrial biogenesis
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Effects of Elevated Circulating Hormones on Resistance Exercise-Induced Akt Signaling
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How nutrition and exercise maintain the human musculoskeletal mass
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“Also, the selective activation of AMPK by endurance training-like interventions and activation of PKB-TSC2-mTOR signalling by resistance training-like interventions might explain the specific adaptations to these types of exercise in rodent muscle (Atherton et al. 2005).”
BackgroundActuality of Warburg’s views in our understanding of renal cancer metabolism
Godinot, C., de Laplanche, E., Hervouet, É., & Simonnet, H. (2007) · Journal of Bioenergetics and Biomembranes · doi:10.1007/s10863-007-9088-8 · Cited by 49
“Indeed NRFs and PGC-1 family co-activators control mitochondrial biogenesis, likely via the AMP kinase that activates their expression in response to low ATP ( Atherton et al. 2005 ).”
BackgroundRoberts, M. D., Romero, M. A., Mobley, C. B., Mumford, P. W., Roberson, P. A., Haun, C. T., Vann, C. G., Osburn, S. C., Holmes, H. H., Greer, R. A., et al. (2018) · PeerJ · doi:10.7717/peerj.5338 · Cited by 51
“…or greater mitochondrial involvement with muscle hypertrophy in HI responders is seemingly paradoxical given that the intramuscular signaling mechanisms which facilitate muscle protein accretion with RET and mitochondrial biogenesis with endurance training are dichotomous (Atherton et al., 2005).”
BackgroundPetrick, H. L., Pignanelli, C., Barbeau, P., Churchward‐Venne, T. A., Dennis, K. M. J. H., van Loon, L. J. C., Burr, J. F., Goossens, G. H., & Holloway, G. P. (2019) · The Journal of Physiology · doi:10.1113/jp277765 · Cited by 54
“However, because AMPK is capable of inhibiting anabolic pathways (Hawley, 2009), acute RE is suggested to be a less potent activator of AMPK compared to aerobic exercise (Atherton et al. 2005; Lundberg et al. 2014), and recent evidence suggests that a greater increase in AMPK phosphorylation is not present following B…”
BackgroundExercise-Regulated Mitochondrial and Nuclear Signalling Networks in Skeletal Muscle
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“Moreover, Atherton et al. (2005) indicate that the inhibition of AMPK/mTOR signaling pathway (i.e., the inhibition of phosphorylated AMPK) would lead to the inhibition of protein synthesis and lack of hypertrophic muscles [36].”
BackgroundTruncated splice variant PGC-1α4 is not associated with exercise-induced human muscle hypertrophy
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“Over time, several molecular ‘master regulators’ have been purported to control exercise-specific adaptations (Baar & Esser 1999, Nader & Esser 2001, Atherton et al. 2005, Terzis et al. 2008).”
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Dihydromyricetin Improves Physical Performance under Simulated High Altitude
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Metadata
- Authors
- Atherton, P. J., Babraj, J. A., Smith, K., Singh, J., Rennie, M. J., & Wackerhage, H.
- Affiliations
- University of Nottingham (GB)
- University of Dundee (GB)
- University of Lancashire (GB)
- ORCID
- Venue
- The FASEB Journal
- Publisher
- Wiley
- Published
- 2005-02-16
- Volume
- 19
- Issue
- 7
- Pages
- 1-23
- ISSN
- 0892-6638 (ISSN-L)
- 1530-6860
- OpenAlex
- W2115928938
- Cited by
- 475
- References
- 62
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 10 · 2023: 21 · 2022: 15 · 2021: 15 · 2020: 18 · 2019: 25 · 2018: 35 · 2017: 16 · 2016: 22 · 2015: 20 · 2014: 30 · 2013: 33 · 2012: 23
- FWCI
- 12.47
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The FASEB Journal (publishedVersion)
- PubMed (publishedVersion)
- CLOK (University of Central Lancashire) (submittedVersion)
- Funders
- National Institutes of Health (AR 49869)
- Biotechnology and Biological Sciences Research Council
- Diabetes UK
- Tenovus
- University of Central Lancashire
- University of Dundee
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- AMPK/PGC-1α signaling, neuromuscular electrical stimulation, high-frequency stimulation, low-frequency stimulation, endurance training adaptation, resistance training adaptation, muscle protein synthesis, muscle hypertrophy, mitochondrial biogenesis, UCP3, translational regulation, p70S6K, 4E-BP1
- MeSH terms
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Tuberous Sclerosis Complex 2 Protein, Adaptation, Physiological, Adenylate Kinase, Animals, Electric Stimulation, Enzyme Activation, Physical Exertion, Male, Muscle Contraction, Muscle Proteins, Myofibrils, Phosphorylation, Physical Conditioning, Animal, Physical Endurance, Protein Kinases, Sarcoplasmic Reticulum, Transcription Factors, Signal Transduction, RNA-Binding Proteins, Rats, Wistar, Muscle, Skeletal, Mitogen-Activated Protein Kinases, Tumor Suppressor Proteins, Proto-Oncogene Proteins c-akt, Rats, TOR Serine-Threonine Kinases
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