Cited by 2,909Exercise and Physiological ResponsesMuscle Physiology and DisordersAdipokines, Inflammation, and Metabolic Diseases

Muscles, exercise and obesity: skeletal muscle as a secretory organ

Pedersen, Bente K., Febbraio, Mark A.·2012·Nature Reviews Endocrinology

Abstract

During the past decade, skeletal muscle has been identified as a secretory organ. Accordingly, we have suggested that cytokines and other peptides that are produced, expressed and released by muscle fibres and exert either autocrine, paracrine or endocrine effects should be classified as myokines. The finding that the muscle secretome consists of several hundred secreted peptides provides a conceptual basis and a whole new paradigm for understanding how muscles communicate with other organs, such as adipose tissue, liver, pancreas, bones and brain. However, some myokines exert their effects within the muscle itself. Thus, myostatin, LIF, IL-6 and IL-7 are involved in muscle hypertrophy and myogenesis, whereas BDNF and IL-6 are involved in AMPK-mediated fat oxidation. IL-6 also appears to have systemic effects on the liver, adipose tissue and the immune system, and mediates crosstalk between intestinal L cells and pancreatic islets. Other myokines include the osteogenic factors IGF-1 and FGF-2; FSTL-1, which improves the endothelial function of the vascular system; and the PGC-1α-dependent myokine irisin, which drives brown-fat-like development. Studies in the past few years suggest the existence of yet unidentified factors, secreted from muscle cells, which may influence cancer cell growth and pancreas function. Many proteins produced by skeletal muscle are dependent upon contraction; therefore, physical inactivity probably leads to an altered myokine response, which could provide a potential mechanism for the association between sedentary behaviour and many chronic diseases.

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Crossref · 10.1038/nrendo.2012.49

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Authors
Pedersen, B. K., & Febbraio, M. A.
Affiliations
  • University of Copenhagen (DK)
  • Baker Heart and Diabetes Institute (AU)
Corresponding author
Pedersen, Bente K.
Venue
Nature Reviews Endocrinology
Published
2012-04-03
Volume
8
Issue
8
Pages
457-465
ISSN
  • 1759-5029 (ISSN-L)
  • 1759-5037
OpenAlex
W2117457995
Cited by
2,909
References
123
Citations by year
2026: 307 · 2025: 252 · 2024: 208 · 2023: 218 · 2022: 247 · 2021: 240 · 2020: 231 · 2019: 214 · 2018: 181 · 2017: 194 · 2016: 147 · 2015: 168 · 2014: 147 · 2013: 128 · 2012: 22
FWCI
19.03
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Reviews Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (publishedVersion)
Topics
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
myokines, physical activity, obesity, interleukin-6, irisin, myostatin, brain-derived neurotrophic factor, AMPK, fat oxidation, muscle hypertrophy, insulin-like growth factor I, FGF2, PGC-1α, brown adipose tissue, sedentary behavior, physical inactivity, cancer, pancreatic islets, intestinal L cells
MeSH terms
Adipose Tissue, Bone and Bones, Brain, Humans, Liver, Obesity, Pancreas, Exercise, Cytokines, Muscle, Skeletal

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