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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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“Previous studies have shown that energy-allocation and lipid mobilization may increase this cytokine [61,62], although it has been also commonly described that weight loss through energy restricted diet and/or exercise may decrease In addition to phenolic compounds, other substances may be related…”
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“* Significant association (p < 0.05). its role as anti-inflammatory cytokine, particularly in muscle tissues, this cytokine has the most strengthen association with age, as documented in the Inflammaging process (Kistner et al., 2022; Pedersen and Febbraio, 2008).”
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“Unfortunately, we do not have data on muscle-speci fi c expression of IL6, however, being IL6 a well-known myokine needed to induce muscle repair (53, 54), it can be inferred that, in absence of overt infections, the large majority of circulating IL6 comes from muscles.”
BackgroundRivas-Campo, Y., Aibar‐Almazán, A., Afanador-Restrepo, D. F., García-Garro, P. A., Vega-Ávila, G. C., Rodríguez-López, C., Castellote‐Caballero, Y., Carcelén‐Fraile, M. D. C., & Lerma, L. L. (2023) · Life · doi:10.3390/life13051224 · Cited by 15
Han, L., Li, P., He, Q., Yang, C. G., Jiang, M., Wang, Y., Cao, Y., Han, X., Liu, X., & Wu, W. (2023) · Aging and Disease · doi:10.14336/ad.2023.1125 · Cited by 17
Metabolic liability for weight gain in early adulthood
Murthy, V. L., Mosley, J. D., Perry, A., Jacobs, D. R., Tanrıverdi, K., Zhao, S., Sawicki, K. T., Carnethon, M. R., Wilkins, J. T., Nayor, M. G., et al. (2024) · Cell Reports Medicine · doi:10.1016/j.xcrm.2024.101548 · Cited by 14
Il-6 signaling exacerbates hallmarks of chronic tendon disease by stimulating reparative fibroblastsPreprint
Stauber, T., Moschini, G., Hussien, A. A., Jaeger, P. K., Bock, K. D., & Snedeker, J. G. (2023) · eLife · doi:10.7554/elife.87092 · Cited by 15
Exerkines and myokines in aging sarcopenia
Wang, H., He, W., Chen, P., Wang, H., Wang, H., Zhu, L., & Liu, X. (2025) · Frontiers in Endocrinology · doi:10.3389/fendo.2025.1592491 · Cited by 20
Mićić, B., Djordjevic, A. D., Veličković, N. A., Kovačević, S., Martić, T., Μacut, D., & Milutinović, D. V. (2023) · Biomedicines · doi:10.3390/biomedicines11061586 · Cited by 14
“treatment are increased cytokines in these animals, since Il1b, as obesity-related, and Il6, as a muscle energy sensor, contribute to increased AMPK activity [51,52].”
BackgroundSu, Y., & Su, Z. (2025) · Clinical and Experimental Medicine · doi:10.1007/s10238-025-01852-3 · Cited by 13
Hormonal, immune, and oxidative stress responses to blood flow‐restricted exercise
Hjortshoej, M. H., Aagaard, P., Storgaard, C. D., Juneja, H., Lundbye‐Jensen, J., Magnusson, S. P., & Couppé, C. (2023) · Acta Physiologica · doi:10.1111/apha.14030 · Cited by 13
Exercise, autoimmune diseases and T-regulatory cells
Blank, M., Israeli, D., & Shoenfeld, Y. (2024) · Journal of Autoimmunity · doi:10.1016/j.jaut.2024.103317 · Cited by 14
Orioli, L., & Thissen, J. (2025) · Frontiers in Endocrinology · doi:10.3389/fendo.2025.1554617 · Cited by 17
“However, this effect appears to be restricted to speci fi c muscle tissues (153).”
Trinh, B., Rasmussen, S. J., Brøgger-Jensen, M. E., Engelhard, C. A., Lund, A., Tavanez, A. R., Vassilieva, A., Janum, S., Iepsen, U. W., Kiens, B., et al. (2025) · Cell Reports Medicine · doi:10.1016/j.xcrm.2025.102042 · Cited by 17
“15 Whether IL-6 also plays a role in directing glucose to specific tissues or cells in the postprandial state remains unknown.”
Train your T cells: How skeletal muscles and T cells keep each other fit during aging
Slaets, H., Fonteyn, L., Eijnde, B. O., & Hellings, N. (2023) · Brain Behavior and Immunity · doi:10.1016/j.bbi.2023.03.006 · Cited by 12
Pinto, A. P., Muñoz, V. R., da Rocha, A. L., Rovina, R. L., Ferrari, G. D., Alberici, L. C., Simabuco, F. M., Teixeira, G. R., Pauli, J. R., de Moura, L. P., et al. (2022) · Frontiers in Immunology · doi:10.3389/fimmu.2022.953272 · Cited by 14
“Interleukin 6 (IL-6) is a pleiotropic cytokine with roles in acute-phase response, skeletal mass, and metabolism (1).”
BackgroundResultInfluentialGonzález-Salazar, L. E., Serralde-Zúñiga, A. E., Flores‐López, A., Díaz-Sánchez, J. P., Vera, I., Pichardo‐Ontiveros, E., Guizar-Heredia, R., Hernández-Gómez, K. G., Vigil‐Martínez, A., Arteaga-Sánchez, L., et al. (2022) · British Journal Of Nutrition · doi:10.1017/s0007114522002963 · Cited by 12
“…could regulate glucose production in the liver, lipolysis in adipose tissue and insulin secretion and can intramuscularly promote glucose uptake and fat oxidation through phosphoinositide 3-kinase (PI3K) activated by AMP-activated protein kinase (AMPK), thus improving insulin sensitivity (35) .”
Exercise as a therapeutic intervention for long-lasting and chronic diseases
Febbraio, M. A., & Pedersen, B. K. (2026) · Cell Metabolism · doi:10.1016/j.cmet.2026.02.017 · Cited by 12
Lipid-Independent Regulation of PLIN5 via IL-6 through the JAK/STAT3 Axis in Hep3B Cells
Krizanac, M., Sanchez, P. B. M., Schröder, S. K., Weiskirchen, R., & Asimakopoulos, A. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms24087219 · Cited by 11
“This was expected based on previous reports on IL-6 responsiveness in other cell types and tissues [23,44].”
MethodKoop, M. A., Sleijser‐Koehorst, M. L. S., Hooijmans, C. R., Tdlohreg, P. Q., Schipholt, I. J. L., Scholten-Peeters, G. G. M., & Coppieters, M. W. (2023) · Frontiers in Immunology · doi:10.3389/fimmu.2023.1215566 · Cited by 11
“Together with increased sympathoadrenal activity these responses induce an anti-inflammatory environment with each bout of exercise (22, 25, 26).”
BackgroundMemelink, R. G., Njemini, R., Kuil, M. J. J. D. B., Wopereis, S., den Bosch, J. D. V., Schoufour, J. D., Tieland, M., Weijs, P. J. M., & Bautmans, I. (2024) · Experimental Gerontology · doi:10.1016/j.exger.2024.112410 · Cited by 13
“Next to its role as exercise signalling molecule, the myokine IL-6 also acts as a short-term energy allocator (Kistner et al., 2022).”
BackgroundDolan, E., Dumas, A., Esteves, G. P., Takarabe, L. L., Perfeito, L. A. M., Keane, K. M., Gualano, B., Kelley, G. A., Burke, L. M., Sale, C., et al. (2024) · Sports Medicine · doi:10.1007/s40279-024-02087-0 · Cited by 15
“…as a short-term energy allocator, which may have a role both in sensing the energy status of active muscle, including the rate of glycogen depletion, and in responding to energetic stress by liberating stored somatic energy and driving short-term energy allocation toward the active muscle [60].”
Chen, G., Chen, B., Wu, Y., Nie, H., Zhong, Z., Yang, S., Qin, R., Kang, W., Zhang, C., Wang, N., et al. (2025) · Molecular Cancer · doi:10.1186/s12943-025-02379-7 · Cited by 15
“Conversely, IL-6 produced by tumor cells enhances inflammation and promotes tumor development [116].”
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Mechanisms Underlying the Rarity of Skeletal Muscle Cancers
Kump, D. S. (2024) · International Journal of Molecular Sciences · doi:10.3390/ijms25126480 · Cited by 10
“SKM is a primary source of exercise-induced increases in IL-6, although it has a short clearance rate [209].”
BackgroundLan, F., Xin, T., Zhang, Y., Li, A., Wan, L., Du, J., Zheng, P., Nie, C., Pan, Q., & Zhu, W. (2025) · International Journal of Biological Macromolecules · doi:10.1016/j.ijbiomac.2025.140814 · Cited by 11
Weight Loss‐Associated Remodeling of Adipose Tissue Immunometabolism
Basso, P. J., Schcolnik‐Cabrera, A., Zhu, M., Strachan, E. R., Clemente‐Casares, X., & Tsai, S. J. (2025) · Obesity Reviews · doi:10.1111/obr.13975 · Cited by 13
“In individuals with obesity engaging in exercise, skeletal muscle-released IL-6 induces VAT lipolysis and therefore diminishes VAT mass [181], an effect that allows AT-derived FAs to shunt toward the exercising muscles [182] while simultaneously reducing pro-inflammatory ATMs [180].”
Blaszczak, W., White, B., Monterisi, S., & Swietach, P. (2024) · Cell Reports · doi:10.1016/j.celrep.2023.113612 · Cited by 9
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Brendborg, N., & Febbraio, M. A. (2025) · The Journal of Physiology · doi:10.1113/jp286747 · Cited by 10
Grecca, I. S. G., Miola, V. F. B., Ferreira, J. C., Rissato, T., da Silva, L. M. D., Totti, P. G. F., Gianini, S. H. S., de Souza, M. D. S. S., de Souza, J. D. S. S., Araújo, A. C., et al. (2025) · Pharmaceutics · doi:10.3390/pharmaceutics17081088 · Cited by 9
“Epidermal growth factor (EGF) stimulates cell proliferation and differentiation and participates in tissue repair and wound healing [35].”
Minafra, A. R., Chadt, A., Rafii, P., Al‐Hasani, H., Behnke, K., & Scheller, J. (2022) · Frontiers in Endocrinology · doi:10.3389/fendo.2022.1028808 · Cited by 9
“IL-6 signalling has been reported to be involved not only in regulation of weight loss but also in improved glucose and insulin sensitivity induced by physical activity (14).”
BackgroundNintou, E., Karligiotou, E., Vliora, M., Ioannou, L. G., & Flouris, A. D. (2022) · International Journal of Molecular Sciences · doi:10.3390/ijms232113446 · Cited by 9
“It plays key anti-diabetic roles, enhancing muscular glucose uptake, exerting effects on pancreatic insulin secretion, and promoting fatty-acid oxidation and lipolysis [75].”
Background
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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