Cited by 324Muscle Physiology and DisordersAdipokines, Inflammation, and Metabolic DiseasesDiabetes, Cardiovascular Risks, and Lipoproteins

Increased secretion and expression of myostatin in skeletal muscle from extremely obese women

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Hittel, Dustin S., Berggren, Jason R., Shearer, Jane, Boyle, Kristen, Houmard, Joseph A.·2009·Diabetes

Abstract

OBJECTIVE: Obesity is associated with endocrine abnormalities that predict the progression of insulin resistance to type 2 diabetes. Because skeletal muscle has been shown to secrete proteins that could be used as biomarkers, we characterized the secreted protein profile of muscle cells derived from extremely obese (BMI 48.8 +/- 14.8 kg/m(2); homeostasis model assessment [HOMA] 3.6 +/- 1.0) relative to lean healthy subjects (BMI 25.7 +/- 3.2 kg/m(2); HOMA 0.8 +/- 0.2). RESEARCH DESIGN AND METHODS: We hypothesized that skeletal muscle would secrete proteins that predict the severity of obesity. To test this hypothesis, we used a "bottom-up" experimental design using stable isotope labeling by amino acids in culture (SILAC) and liquid chromatography/mass spectometry/mass spectometry (LC-MS/MS) to both identify and quantify proteins secreted from cultured myotubes derived from extremely obese compared with healthy nonobese women. RESULTS: Using SILAC, we discovered a 2.9-fold increase in the secretion of myostatin from extremely obese human myotubes. The increased secretion and biological activity of myostatin were validated by immunoblot (3.16 +/- 0.18, P < 0.01) and a myoblast proliferation assay using conditioned growth medium. Myostatin was subsequently shown to increase in skeletal muscle (23%, P < 0.05) and plasma (35%, P < 0.05) and to correlate (r(2) = 0.6, P < 0.05) with the severity of insulin resistance. CONCLUSIONS: Myostatin is a potent antianabolic regulator of muscle mass that may also play a role in energy metabolism. These findings show that increased expression of myostatin in skeletal muscle with obesity and insulin resistance results in elevated circulating myostatin. This may contribute to systemic metabolic deterioration of skeletal muscle with the progression of insulin resistance to type 2 diabetes.

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  1. [44]Allen DL, Cleary AS, Speaker KJ, Lindsay SF, Uyenishi J, Reed JM, Madden MC, Mehan RS: Myostatin, activin receptor IIb, and follistatin-like-3 gene expression are altered in adipose tissue and skeletal muscle of obese mice. Am J Physiol Endocrinol Metab 294: E918–E927, 2008 18334608

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Authors
Hittel, D. S., Berggren, J. R., Shearer, J., Boyle, K., & Houmard, J. A.
Affiliations
  • University of Calgary (CA)
  • East Carolina University (US)
Venue
Diabetes
Published
2009-01-01
Volume
58
Issue
1
Pages
30-38
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2132813206
Cited by
324
References
47
Citations by year
2026: 10 · 2025: 19 · 2024: 12 · 2023: 18 · 2022: 19 · 2021: 21 · 2020: 20 · 2019: 14 · 2018: 26 · 2017: 13 · 2016: 11 · 2015: 25 · 2014: 31 · 2013: 24 · 2012: 22
FWCI
5.35
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • Diabetes (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • The Scholarship East Carolina University's Institutional Repository (East Carolina University) (submittedVersion)
Funders
  • Heart and Stroke Foundation of Canada
  • Canadian Diabetes Association
  • Fondation pour la Recherche Médicale
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK056112)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
myostatin, obesity, insulin resistance, skeletal muscle, myotubes, secreted proteins, type 2 diabetes, myoblast proliferation, energy metabolism, women
MeSH terms
Adult, Chromatography, Liquid, Female, Humans, Insulin Resistance, Middle Aged, Obesity, Immunoblotting, Muscle, Skeletal, Muscle Fibers, Skeletal, Tandem Mass Spectrometry, Myostatin

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