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Interleukin 6 as an energy allocator in muscle tissue
Abstract
Extensive research has shown that interleukin 6 (IL-6) is a multifunctional molecule that is both proinflammatory and anti-inflammatory, depending on the context. Here, we combine an evolutionary perspective with physiological data to propose that IL-6's context-dependent effects on metabolism reflect its adaptive role for short-term energy allocation. This energy-allocation role is especially salient during physical activity, when skeletal muscle releases large amounts of IL-6. We predict that during bouts of physical activity, myokine IL-6 fulfills the three main characteristics of a short-term energy allocator: it is secreted from muscle in response to an energy deficit, it liberates somatic energy through lipolysis and it enhances muscular energy uptake and transiently downregulates immune function. We then extend this model of energy allocation beyond myokine IL-6 to reinterpret the roles that IL-6 plays in chronic inflammation, as well as during COVID-19-associated hyperinflammation and multiorgan failure.
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“While IL-6 released during exercise promotes insulin-independent glucose uptake by inducing the translocation of GLUT4 transporters in adipose tissue via the phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway”
From Exercise-Induced Muscle–Fat Crosstalk: Molecular Mediators and Their Pharmacological Modulation for the Maintenance of Metabolic Flexibility in Aging (2025) · cites this paper as [49]
In the citing paper
“IL-6 also promotes hepatic gluconeogenesis by activating key gluconeogenic enzymes, including phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G-6-Pase) [49,50].”
From Exercise-Induced Muscle–Fat Crosstalk: Molecular Mediators and Their Pharmacological Modulation for the Maintenance of Metabolic Flexibility in Aging (2025) · cites this paper as [49]
In the citing paper
“Circulating IL-6 concentrations increase dramatically in response to exercise and are intricately tied to exercise intensity, meaning that IL-6 is released from the skeletal muscle to restore muscle function following exercise [110].”
From Exerkines and Sarcopenia: Unveiling the Mechanism Behind Exercise-Induced Mitochondrial Homeostasis (2025) · cites this paper as [110]
In the citing paper
“In summary, our results extend the concept of exercise-induced, muscle-derived IL-6 as an energy sensor and energy allocator [ 7 , 8 ], involved in intensity-dependent fuel selection [ 34 ].”
From IL-6 Activity is Required for Maximal Catecholamine Release During High-Intensity Exercise in Men (2026) · cites this paper as [8]
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“…however, be biologically relevant: IL6 can promote survival under cellular stress by shifting energy metabolism toward a glycolytic, proproliferative phenotype (Kistner et al. 2022 ; Xu et al. 2024 ), potentially at the expense of MSC differentiation (Heikkinen et al. 2024b) and tissue homeostasis.”
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“The hypothesis that exercise functionally reprograms IL-6 signaling remains plausible based on prior experimental literature (4 – 6, 18), but was not statistically supported by the present cross-sectional data and warrants direct testing in longitudinal and mechanistic studies (16).”
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“Mechanistically, chronic IL-6 activation may divert metabolic resources from muscle maintenance, contributing to weakness and fatigue [40].”
Lung–Muscle Interaction in ARDS: Implications for Injury, Recovery, and Long‐Term Outcomes
Amarelle, L., Pécora, M., Hermida, V., & Angulo, M. (2026) · Comprehensive physiology · doi:10.1002/cph4.70201
“…(IL)- 6 was the first cytokine demonstrated to be released into the circulation after exercise and is known to regulate muscle metabolism, energy allocation, cell proliferation, and differentiation (Steensberg et al. 2000; Febbraio et al. 2004; Munoz-Canoves et al. 2013; Kistner et al. 2022).”
França, D. C. H., Barbosa, A. C., Ribeiro, E. B., Neto, A. M. D. M., França, E. C. H., Borges, M. D., de Marchi, P. G. F., Honório‐França, A. C., & França, E. L. (2026) · Current Issues in Molecular Biology · doi:10.3390/cimb48070674
“…levels and IL-6 may be important for diabetic patients, especially those who are insulin-dependent, in whom glycemic levels are higher, since IL-6 increases lipolysis and fat oxidation in adipose tissue during exercise and increases insulin sensitivity in patients with type 2 diabetes [55,58,60].”
Ríos, D. C. Z., Gómez, M. Á., Gómez, J. M., Polo, F. A., Sarria, B. O., Rivera, J. A., & Matta, A. J. (2026) · Current Issues in Molecular Biology · doi:10.3390/cimb48070686
“Interleukin-6 (IL-6) regulates anti-inflammatory cytokines such as Interleukin-1 receptor antagonist (IL-1Ra) and Interleukin-10 (IL-10) and influences carbohydrate and lipid metabolism [7].”
Prowting, J. L., Elgaml, A., Fraschetti, E. C., Klentrou, P., & Josse, A. R. (2026) · Applied Sciences · doi:10.3390/app16146987
Postpartum blood-milk barrier integrity in Holstein dairy cows with contrasting metabolic status
Heiri, T., Eichinger, J., Hendricks, J., Reiche, A.-M., Dohme‐Meier, F., & Gross, J. J. (2026) · JDS Communications · doi:10.3168/jdsc.2026-1104
Lu, H., Liu, B., Ji, J., Shuai, L., & Cao, J. (2026) · Frontiers in Physiology · doi:10.3389/fphys.2026.1886745
Myokines, the Growing Basis for “Exercise Is Medicine”
Heitkamp, H. (2026) · Health · doi:10.4236/health.2026.188047
Bastos, M. F., Longo, P. L., Furtado, G. E., dos Santos, J. R., Rodrigues, A. T., Carvalho, J. V. O., Machado‐Lima, A., Brech, G. C., Bachi, A. L. L., Barros, M. P., et al. (2026) · European Journal of Nutrition · doi:10.1007/s00394-026-04076-7 · Cited by 1
Kerlikowsky, F., & Hahn, A. (2026) · Ernährung & Medizin · doi:10.1055/a-2908-6734
“Das Beispiel IL-6 zeigt zudem, dass die biologische Wirkung der Zytokine je nach Herkunftsgewebe variabel ist und sowohl eine pro-als auch eine antiinflammatorische Reaktion anzeigen kann [40, 41].”
Haq, A. T. A., Yang, P.-P., Shen, P.-C., Tseng, H., Chen, L.-M., Chen, M. A., Yuh, C.-H., & Hsu, H.-L. (2026) · Research Square · doi:10.21203/rs.3.rs-10952514/v1
Huang, H., Zhang, H., Fan, M., Li, Y., & Wang, L. (2026) · Critical Reviews in Food Science and Nutrition · doi:10.1080/10408398.2026.2742761
Srpčič, A., Miš, K., Gantar, B. Ž. B., Dolinar, K., Mjaaseth, U. N., Rustan, A. C., Kase, E. T., Lakota, K., Pirkmajer, K. P., & Pirkmajer, S. (2026) · American Journal of Physiology-Cell Physiology · doi:10.1152/ajpcell.00264.2026
Immunometabolic regulation by skeletal muscles in infections and sepsis
Makarova, S., Arkhipova, A., & Nosenko, M. A. (2026) · Current Opinion in Endocrine and Metabolic Research · doi:10.1016/j.coemr.2026.100628
Dolan, E., Pinto, R. S., Reina, B. A., Esteves, G. P., Miranda, V. C. A., Roschel, H., Gualano, B., Sale, C., & Swinton, P. A. (2026) · European Journal of Applied Physiology · doi:10.1007/s00421-026-06461-w
Systemic proteomic dynamics of acute exercise reveal genetic links to health and disease
Kurgan, N., Larsen, J. K., Jespersen, N. Z., Díez-Obrero, V., Svenstrup, V., Moreno‐Justicia, R., Heywood, S. E., Lindqvist, C. B., Ottander, L., Samodova, D., et al. (2026) · Nature Metabolism · doi:10.1038/s42255-026-01621-w
“The best-characterized exercise-responsive protein so far is the myokine IL-6, a cytokine released during acute exercise 10 , shown to regulate energy allocation in muscle 11 and mediate long-term adaptations to exercise training 12 .”
Disruption of the Muscle–Brain Axis in Ageing: Role of Myokines in Sarcopenia and Neurodegeneration
Molina, V. A. M., Salinas, C. N. L., Vásquez, C. A., Matos, A., & Riofrío, D. A. (2026) · Cells · doi:10.3390/cells15201910
“Its release from skeletal muscle during physical activity should be distinguished from its involvement in chronic inflammation [11].”
BAŞOL, C., Kekeçoğlu, M., & Coşkun, S. K. (2026) · Food Technology and Biotechnology · doi:10.17113/ftb.64.04.26.9325
“Previous studies have reported conflicting effects of whey protein on inflammatory cytokines, with findings indicating reductions [ 48 ], no change [ 49 ] or increases [ 50 ] in inflammatory marker concentrations.”
Metadata
- Authors
- Kistner, T. M., Pedersen, B. K., & Lieberman, D. E.
- Affiliations
- Harvard University (US)
- University of Copenhagen (DK)
- Corresponding author
- Kistner, Timothy M.
- Pedersen, Bente K.
- Lieberman, Daniel E.
- Venue
- Nature Metabolism
- Published
- 2022-02-24
- Volume
- 4
- Issue
- 2
- Pages
- 170-179
- ISSN
- 2522-5812 (ISSN-L)
- OpenAlex
- W4213414654
- Cited by
- 295
- References
- 149
- Citations by year
- 2026: 54 · 2025: 87 · 2024: 68 · 2023: 56 · 2022: 30
- FWCI
- 7.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Nature Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology (medical) › Exercise and Physiological Responses
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
- Life Sciences › Immunology and Microbiology › Immunology › Cytokine Signaling Pathways and Interactions
- Keywords
- interleukin-6, myokines, energy allocation, skeletal muscle, physical activity, lipolysis, energy metabolism, chronic inflammation, multiple organ failure, evolutionary perspective
- MeSH terms
- COVID-19, SARS-CoV-2, Humans, Exercise, Interleukin-6, Muscle, Skeletal
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