Cited by 69Muscle Physiology and DisordersMuscle metabolism and nutritionNutrition and Health in Aging

The Effect of Glutamine on Prevention of Glucocorticoid-Induced Skeletal Muscle Atrophy Is Associated with Myostatin Suppression

Salehian, Behrouz, Mahabadi, Vahid, Bilas, Josephine, Taylor, Wayne E., Ma, Kun·2006·Metabolism

Abstract

Excess glucocorticoids (GCs) cause muscle atrophy. Glucocorticoid-induced muscle atrophy is associated with increased intramuscular myostatin expression. Myostatin is a negative regulator of skeletal muscle mass. Glutamine prevents GC-induced muscle atrophy. We hypothesized that glutamine effect on reversal of GC-induced muscle atrophy is mediated in part by suppression of myostatin. We administered daily to male Sprague-Dawley rats dexamethasone, dexamethasone plus glutamine, saline or saline plus glutamine, all pair-fed. Animals were killed on day 5. Body weight and weights of gastrocnemius muscles were measured. Myostatin expression was measured by Northern and Western blots, and was compared with glyceraldehyde-3-phosphate dehydrogenase. Myoblast C2C12 cells were exposed to dexamethasone, or dexamethasone and glutamine, and their myostatin messenger RNA and protein expression compared with glyceraldehyde-3-phosphate dehydrogenase. Myostatin promoter activity was measured by luciferase activity of transfected C2C12 cells, grown in medium including dexamethasone, or dexamethasone plus glutamine. Rats that received dexamethasone showed significant body and muscle weight loss accompanied by an increase in intramuscular myostatin expression, compared with their saline-treated controls. Pair-fed rats given dexamethasone plus glutamine had significantly less reduction in body and muscle weights and lower myostatin expression when compared with those treated with dexamethasone alone. In C2C12 myoblast cells, addition of glutamine to dexamethasone prevented the hyperexpression of myostatin induced by dexamethasone. Myostatin promoter activity increased in cells exposed to dexamethasone, but this increase was partially blocked by addition of the glutamine. Administration of glutamine partially prevents GC-induced myostatin expression and muscle atrophy, providing a potential mechanism for the prevention of muscle atrophy induced by glucocorticoids.

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Crossref · 10.1016/j.metabol.2006.05.009

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  • Glutamine supplementation prevents glucocorticoid-induced SD rat skeletal muscle atrophy and increases muscle mass, partially through inhibiting myostatin.

    “Moreover, glutamine supplementation prevents glucocorticoid-induced SD rats skeletal muscle atrophy and increases muscle mass, partially through inhibiting the expression of myostatin.”
  • In C2C12 myoblast cells, glutamine treatment prevents dexamethasone-induced hyperexpression of myostatin.

    “Similarly, in C2C12 myoblast cells, glutamine treatment prevents the hyperexpression of myostatin induced by dexamethasone [37].”

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Authors
Salehian, B., Mahabadi, V., Bilas, J., Taylor, W. E., & Ma, K.
Affiliations
Charles R. Drew University of Medicine and Science (US)
Corresponding author
Salehian, Behrouz
Venue
Metabolism
Publisher
Elsevier BV
Published
2006-09
Volume
55
Issue
9
Pages
1239-1247
ISSN
0026-0495 (ISSN-L)
OpenAlex
W2044395031
Cited by
69
References
47
Citations by year
2026: 1 · 2025: 2 · 2024: 4 · 2023: 4 · 2021: 1 · 2020: 1 · 2019: 5 · 2018: 2 · 2017: 1 · 2016: 4 · 2015: 4 · 2014: 4 · 2013: 6 · 2012: 8
FWCI
2.04
Type
journal article
Language
en
Open access
closed
Locations
  • Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5u54rr014616-10)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK049296, DK49296, R01DK059627, DK59627)
  • National Center for Research Resources (RR 03026, P20RR011145, RR 11145, RR-14616-04)
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
glutamine, glucocorticoid-induced muscle atrophy, myostatin, dexamethasone, skeletal muscle atrophy, gastrocnemius, C2C12 myoblasts, muscle mass
MeSH terms
Animals, Body Weight, Cell Line, Dexamethasone, Drug Antagonism, Glucocorticoids, Glutamine, Male, Muscular Atrophy, Organ Size, Promoter Regions, Genetic, RNA, Messenger, Transforming Growth Factor beta, Rats, Sprague-Dawley, Muscle, Skeletal, Rats, Myostatin

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