Cited by 83Exercise and Physiological ResponsesAdipokines, Inflammation, and Metabolic DiseasesMuscle Physiology and Disorders

Interleukin-15 as a myokine: Mechanistic insight into its effect on skeletal muscle metabolism

Nadeau, Lucien, Aguer, Céline·2019·Applied Physiology Nutrition and Metabolism

Abstract

Interleukin (IL)-15 is a cytokine with important immunological functions. It is highly expressed in skeletal muscle and is believed to be a myokine, a hypothesis supported by the rapid increase in circulating levels of IL-15 in response to exercise. Treatment with high doses of IL-15 results in metabolic adaptations such as improved insulin sensitivity and whole-body fatty acid oxidation and protection from high-fat-diet-induced obesity and insulin resistance. IL-15 secreted by contracting muscle may therefore act as an endocrine factor to improve adiposity and energy metabolism in different tissues. Most studies have used supraphysiological doses of IL-15 that do not represent circulating IL-15 in response to exercise. However, evidence shows that IL-15 levels are higher in muscle interstitium and that IL-15 might improve muscle glucose homeostasis and oxidative metabolism in an autocrine/paracrine manner. Nevertheless, how IL-15 signals in skeletal muscle to improve muscle energy metabolism is not understood completely, especially because the absence of the α subunit of the IL-15 receptor (IL-15Rα) results in a phenotype similar to that of overexpressing/oversecreting IL-15 in mice. In this article, we review the literature to propose a model for the regulation of IL-15 by the soluble form of IL-15Rα to explain why some findings in the literature seem, at first glance, to be contradictory.

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Crossref · 10.1139/apnm-2018-0022

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Authors
Nadeau, L., & Aguer, C.
Affiliations
University of Ottawa (CA)
Venue
Applied Physiology Nutrition and Metabolism
Published
2019-03
Volume
44
Issue
3
Pages
229-238
ISSN
  • 1715-5312 (ISSN-L)
  • 1715-5320
OpenAlex
W2890580671
Cited by
83
References
90
Citations by year
2026: 9 · 2025: 11 · 2024: 11 · 2023: 14 · 2022: 15 · 2021: 7 · 2020: 11 · 2019: 4 · 2018: 1
FWCI
0.72
Type
journal article
Language
en
Open access
closed
Locations
  • Applied Physiology, Nutrition, and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
IL-15, myokines, skeletal muscle metabolism, IL-15 receptor alpha, autocrine and paracrine signaling, physical activity, insulin sensitivity, fatty acid oxidation, glucose homeostasis, oxidative metabolism, obesity, energy metabolism, cytokines
MeSH terms
Animals, Energy Metabolism, Glucose, Humans, Insulin Resistance, Exercise, Muscle, Skeletal, Interleukin-15, PPAR gamma, Adiposity, Lipid Metabolism, Mice, Interleukin-15 Receptor alpha Subunit

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