ArticleExperimental gerontology2014
The effects of age and muscle contraction on AMPK activity and heterotrimer composition.
Article in Experimental gerontology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.
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Who cites it
26 citing papers in PubMed, 44 citations in OpenAlex.
- Calorie restriction and exercise differentially regulate AMP-activated protein kinase across subcellular compartments in skeletal muscle from older male rats.Experimental gerontology · 2026Article
- Article
- Muscle Organoids Reveal Exercise-Like Contractions Rapidly Promote Muscle Health Via Lamtor1's Signaling to Both AMPK and mTOR.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- Chronic treatment of old mice with AICAR reverses age-related changes in exercise performance and skeletal muscle gene expression.FASEB bioAdvances · 2025Article
- Genetic reduction of skeletal muscle glycogen synthase 1 abundance reveals that the refeeding-induced reversal of elevated insulin-stimulated glucose uptake after exercise is not attributable to achieving a high muscle glycogen concentration.FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2024Article
- Energy metabolism dysregulation, cerebrovascular aging, and time-restricted eating: Current evidence and proof-of-concept findings.PNAS nexus · 2024Review
- AMPK signaling inhibits the differentiation of myofibroblasts: impact on age-related tissue fibrosis and degeneration.Biogerontology · 2024Review
- Cardiac System during the Aging Process.Aging and disease · 2023Review
- Greater Phosphorylation of AMPK and Multiple AMPK Substrates in the Skeletal Muscle of 24-Month-Old Calorie Restricted Compared to Ad-Libitum Fed Male Rats.The journals of gerontology. Series A, Biological sciences and medical sciences · 2023Article
- Physiological Systems in Promoting Frailty.Comprehensive Physiology · 2022Review
- Attenuation of the Counter-Regulatory Glucose Response in CVLM C1 Neurons: A Possible Explanation for Anorexia of Aging.Biomolecules · 2022Article
- Article
- Exercise effects on γ3-AMPK activity, Akt substrate of 160 kDa phosphorylation, and glucose uptake in muscle of normal and insulin-resistant female rats.Journal of applied physiology (Bethesda, Md. : 1985) · 2022Article
- Prior AICAR induces elevated glucose uptake concomitant with greater γ3-AMPK activation and reduced membrane cholesterol in skeletal muscle from 26-month-old rats.Facets (Ottawa) · 2022Article
- Mitochondria-localized AMPK responds to local energetics and contributes to exercise and energetic stress-induced mitophagy.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Exercise, but Not Metformin Prevents Loss of Muscle Function Due to Doxorubicin in Mice Using an In Situ Method.International journal of molecular sciences · 2021Article
- Lifelong Aerobic Exercise Alleviates Sarcopenia by Activating Autophagy and Inhibiting Protein Degradation via the AMPK/PGC-1α Signaling Pathway.Metabolites · 2021Article
- Review
- Smooth muscle-specific HuR knockout induces defective autophagy and atherosclerosis.Cell death & disease · 2021Article
- AICAR and nicotinamide treatment synergistically augment the proliferation and attenuate senescence-associated changes in mesenchymal stromal cells.Stem cell research & therapy · 2020Article
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Authors and funding
5 authors at 1 institution in 1 country.
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Abstract
Sarcopenia is characterized by increased skeletal muscle atrophy due in part to alterations in muscle metabolism. AMP-activated protein kinase (AMPK) is a master regulator of skeletal muscle metabolic pathways which regulate many cellular processes that are disrupted in old-age. Functional AMPK is a heterotrimer composed of α, β and γ subunits, and each subunit can be represented in the heterotrimer by one of two (α1/α2, β1/β2) or three (γ1/γ2/γ3) isoforms. Altered isoform composition affects AMPK localization and function. Previous work has shown that overall AMPK activation with endurance-type exercise is blunted in old vs. young skeletal muscle. However, details regarding the activation of the specific isoforms of AMPK, as well as the heterotrimeric composition of AMPK in old skeletal muscle, are unknown. Our purpose here, therefore, was to determine the effect of old-age on 1) the activation of the α1 and α2 catalytic subunits of AMPK in skeletal muscle by a continuous contraction bout, and 2) the heterotrimeric composition of skeletal muscle AMPK. We studied gastrocnemius (GAST) and tibialis anterior (TA) muscles from young adult (YA; 8months old) and old (O; 30months old) male Fischer344×Brown Norway F1 hybrid rats after an in situ bout of endurance-type contractions produced via electrical stimulation of the sciatic nerve (STIM). AMPKα phosphorylation and AMPKα1 and α2 activities were unaffected by age at rest. However, AMPKα phosphorylation and AMPKα2 protein content and activity were lower in O vs. YA after STIM. Conversely, AMPKα1 content was greater in O vs. YA muscle, and α1 activity increased with STIM in O but not YA muscles. AMPKγ3 overall concentration and its association with AMPKα1 and α2 were lower in O vs. YA GAST. We conclude that activation of AMPKα1 is enhanced, while activation of α2 is suppressed immediately after repeated skeletal muscle contractions in O vs. YA skeletal muscle. These changes are associated with changes in the AMPK heterotrimer composition. Given the known roles of AMPK α1, α2 and γ3, this may contribute to sarcopenia and associated muscle metabolic dysfunction.
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