Cited by 521Muscle Physiology and DisordersMuscle metabolism and nutritionNutrition and Health in Aging

Mechanisms of glucocorticoid-induced myopathy

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Schakman, O, Gilson, H, Thissen, J P·2008·Journal of Endocrinology

Abstract

Glucocorticoid-induced muscle atrophy is characterized by fast-twitch or type II muscle fiber atrophy illustrated by decreased fiber cross-sectional area and reduced myofibrillar protein content. Muscle proteolysis, in particular through the ubiquitin– proteasome system (UPS), is considered to play a major role in the catabolic action of glucocorticoids. The stimulation by glucocorticoids of the UPS is mediated through the increased expression of several atrogenes (‘genes involved in atrophy’), such as atrogin-1 and MuRF-1, two ubiquitin ligases involved in the targeting of protein to be degraded by the proteasome machinery. Glucocorticoids also exert an anti-anabolic action by blunting muscle protein synthesis. These changes in protein turnover may result from changes in the production of two growth factors which control muscle mass, namely IGF-I and myostatin respectively anabolic and catabolic toward the skeletal muscle. The decreased production of IGF-I as well as the increased production of myostatin have been both demonstrated to contribute to the muscle atrophy caused by glucocorticoids. At the molecular level, IGF-I antagonizes the catabolic action of glucocorticoids by inhibiting, through the PI3-kinase/Akt pathway, the activity of the transcription factor FOXO, a major switch for the stimulation of several atrogenes. These recent progress in the understanding of the glucocorticoid-induced muscle atrophy should allow to define new therapies aiming to minimize this myopathy. Promising new therapeutic approaches for treating glucocorticoid-induced muscle atrophy are also presented in this review.

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  • GCs directly activated muscle ring finger-1 and atrogin-1, proteins involved in skeletal muscle proteolysis.

    “GCs directly activated muscle ring finger-1 and atrogin-1, proteins involved in skeletal muscle proteolysis [43]”

    From Low-dose glucocorticoid treatment affects multiple aspects of intermediary metabolism in healthy humans: a randomised controlled trial (2011) · cites this paper as [43]

    The Catabolic action of glucocorticoids section says glucocorticoids stimulate expression of atrogin-1 and MuRF-1, ubiquitin ligases involved in muscle protein degradation. The FOXO section describes this as part of a transcriptional program mediated by FOXO; it does not establish that glucocorticoids directly activate the two proteins. Page numbers were not available in our copy. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Hypercortisolism can present clinically with proximal muscle weakness due to endogenous glucocorticoid excess.

    “Hypercortisolism can present clinically with proximal muscle weakness due to endogenous glucocorticoid excess.”
  • Glucocorticoids inhibit protein synthesis and stimulate protein degradation in skeletal muscles; IGF-1 is decreased and myostatin is increased.

    “Glucocorticoids inhibit protein synthesis and stimulate protein degradation in skeletal muscles. IGF-1 is decreased and myostatin is increased.99”

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Authors
Schakman, O., Gilson, H., & Thissen, J. P.
Affiliations
UCLouvain (BE)
Venue
Journal of Endocrinology
Published
2008-01-31
Volume
197
Issue
1
Pages
1-10
ISSN
  • 0022-0795 (ISSN-L)
  • 1479-6805
OpenAlex
W2111274663
Cited by
521
References
110
Citations by year
2026: 30 · 2025: 26 · 2024: 30 · 2023: 39 · 2022: 36 · 2021: 22 · 2020: 30 · 2019: 33 · 2018: 21 · 2017: 23 · 2016: 21 · 2015: 29 · 2014: 23 · 2013: 41 · 2012: 37
FWCI
1.96
Type
journal article
Language
en
Open access
Locations
  • Journal of Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Libraries (Université catholique de Louvain (UCL), l'Université de Namur (UNamur) and the Université Saint-Louis (USL-B)) (submittedVersion)
Topics
  • 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
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
Keywords
glucocorticoid-induced myopathy, muscle atrophy, ubiquitin-proteasome system, atrogenes, atrogin-1, MuRF1, muscle protein synthesis, insulin-like growth factor I, myostatin, FOXO, PI3K/Akt signaling, skeletal muscle catabolism, treatment options
MeSH terms
Forkhead Box Protein O1, Glycogen Synthase Kinase 3 beta, Animals, Glucocorticoids, Humans, Insulin-Like Growth Factor I, Muscular Atrophy, Protein Kinases, Signal Transduction, CCAAT-Enhancer-Binding Protein-beta, Glycogen Synthase Kinase 3, Activating Transcription Factor 4, Forkhead Transcription Factors, Myostatin, TOR Serine-Threonine Kinases

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