Cited by 266Exercise and Physiological ResponsesMuscle Physiology and DisordersMuscle metabolism and nutrition

Expression of interleukin-15 in human skeletal muscle effect of exercise and muscle fibre type composition

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Nielsen, Anders Rinnov, Mounier, Remi, Plomgaard, Peter, Mortensen, Ole Hartvig, Penkowa, Milena, Speerschneider, Tobias, Pilegaard, Henriette, Pedersen, Bente Klarlund·2007·The Journal of Physiology

Abstract

The cytokine interleukin-15 (IL-15) has been demonstrated to have anabolic effects in cell culture systems. We tested the hypothesis that IL-15 is predominantly expressed by type 2 skeletal muscle fibres, and that resistance exercise regulates IL-15 expression in muscle. Triceps brachii, vastus lateralis quadriceps and soleus muscle biopsies were obtained from normally physically active, healthy, young male volunteers (n = 14), because these muscles are characterized by having different fibre-type compositions. In addition, healthy, normally physically active male subjects (n = 8) not involved in any kind of resistance exercise underwent a heavy resistance exercise protocol that stimulated the vastus lateralis muscle and biopsies were obtained from this muscle pre-exercise as well as 6, 24 and 48 h post-exercise. IL-15 mRNA levels were twofold higher in the triceps (type 2 fibre dominance) compared with the soleus muscle (type 1 fibre dominance), but Western blotting and immunohistochemistry revealed that muscle IL-15 protein content did not differ between triceps brachii, quadriceps and soleus muscles. Following resistance exercise, IL-15 mRNA levels were up-regulated twofold at 24 h of recovery without any changes in muscle IL-15 protein content or plasma IL-15 at any of the investigated time points. In conclusion, IL-15 mRNA level is enhanced in skeletal muscles dominated by type 2 fibres and resistance exercise induces increased muscular IL-15 mRNA levels. IL-15 mRNA levels in skeletal muscle were not paralleled by similar changes in muscular IL-15 protein expression suggesting that muscle IL-15 may exist in a translationally inactive pool.

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Crossref · 10.1113/jphysiol.2007.139618

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  • In individuals who practiced resistance training, 24 h after the last session a two-fold increase in IL-15 mRNA levels was observed, and this response was dependent on the type of muscle fiber.

    “it was possible to confirm that 24 h after the last RT session a two-fold increase in IL-15 mRNA levels was observed, and that this response was also dependent on the type of muscle fiber (Nielsen et al., 2007).”

    From Physical Exercise-Induced Myokines and Muscle-Adipose Tissue Crosstalk: A Review of Current Knowledge and the Implications for Health and Metabolic Diseases (2018) · cites this paper as Nielsen et al., 2007

    The Results report a twofold increase in IL-15 mRNA 24 hours after a heavy resistance-exercise session. However, the Abstract says the participants were not involved in resistance training. It also reports higher baseline IL-15 mRNA in a type-2-fibre-dominant muscle than in a type-1-fibre-dominant muscle, but does not establish that the response to exercise depended on fibre type. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • IL-15 and IL-7 possess anabolic features in rodent models.

    “A number of other myokines, including IL‑15 (53) and IL-7 (54) have further been demonstrated to possess anabolic features in rodent models.”

    From Muscle–Organ Crosstalk: The Emerging Roles of Myokines (2020) · cites this paper as [53]

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Authors
Nielsen, A. R., Mounier, R., Plomgaard, P., Mortensen, O. H., Penkowa, M., Speerschneider, T., Pilegaard, H., & Pedersen, B. K.
Affiliations
  • University of Copenhagen (DK)
  • Rigshospitalet (DK)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2007-09-28
Volume
584
Issue
1
Pages
305-312
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1530294052
Cited by
266
References
30
Citations by year
2026: 11 · 2025: 8 · 2024: 15 · 2023: 15 · 2022: 19 · 2021: 12 · 2020: 16 · 2019: 10 · 2018: 20 · 2017: 16 · 2016: 14 · 2015: 19 · 2014: 14 · 2013: 21 · 2012: 17
FWCI
8.71
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
IL-15, skeletal muscle, resistance training, muscle fiber type distribution, triceps brachii, vastus lateralis, soleus muscle, post-exercise recovery
MeSH terms
Adult, Humans, Immunohistochemistry, Male, RNA, Messenger, Exercise, Gene Expression, Muscle, Skeletal, Muscle Fibers, Fast-Twitch, Interleukin-15, Quadriceps Muscle

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