Loss-of-Function Mutation in Myostatin Reduces Tumor Necrosis Factor α Production and Protects Liver Against Obesity-Induced Insulin Resistance
Open accessAbstract
OBJECTIVE: Insulin resistance develops in tandem with obesity. Ablating myostatin (Mstn) prevents obesity, so we investigated if Mstn deficiency could improve insulin sensitivity. A loss-of-function mutation (Mstn(Ln)) in either one or both alleles of the Mstn gene shows how Mstn deficiency protects whole-body insulin sensitivity. RESEARCH DESIGN AND METHODS: Mstn(Ln/Ln) mice were weaned onto a high-fat diet (HFD) or standard diet. HFD-fed Mstn(Ln/Ln) mice exhibited high lean, low-fat body compositions compared with wild types. Wild-type and heterozygous and homozygous mutant mice were bled to determine basal levels of insulin, glucose, and homeostasis model assessment of insulin resistance. To evaluate postprandial insulin sensitivity between animals of a similar size, glucose and insulin tolerance tests and hyperinsulinemic-euglycemic clamp studies were performed with heterozygous and homozygous mutant mice. Quantitative RT-PCR quantified TNF proportional, variant, IL-6, IL-1beta, F4/80, GPR43, and CD36 expression in muscle, fat, and liver. Histological analysis measured hepatosteatosis. RESULTS: Homozygous mutants were glucose tolerant and protected against overall insulin resistance compared with heterozygous mice. Hyperinsulinemic-euglycemic clamp studies revealed a dramatically improved glucose infusion rate, glucose disposal rate, and hepatic glucose production in 11-month-old Mstn(Ln/Ln) mice on an HFD. Improvements to muscle and liver insulin sensitivity (approximately 200-400%) correlated with 50-75% decreased tumor necrosis factor (TNF)alpha production and coincided with severe Mstn deficiency. Hepatosteatosis appeared to be ameliorated. Short-term treatment of Mstn(Ln/Ln) mice with recombinant Mstn led to increased plasma TNFalpha and insulin resistance. CONCLUSIONS: We find that severe Mstn deficiency caused by Ln (lean) mutations in HFD-fed mice protects muscle and liver against obesity-induced insulin resistance.
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In male myostatin-deficient mice fed a high-fat diet, this metabolic shift is associated with decreased serum cholesterol and triglyceride levels, a 40-fold reduction in TNF-α, and improved insulin sensitivity.
“In male myostatin-deficient mice fed a high-fat diet (HFD), this metabolic shift has been associated with decreased serum cholesterol and triglyceride levels, a 40-fold reduction in TNF-α, and improved insulin sensitivity [72].”
From Exercise-Induced Muscle–Fat Crosstalk: Molecular Mediators and Their Pharmacological Modulation for the Maintenance of Metabolic Flexibility in Aging (2025) · cites this paper as [72]
The Results sections on serum lipids and insulin sensitivity report lower cholesterol and triglycerides and improved insulin sensitivity in male high-fat-diet-fed myostatin-deficient mice (page unavailable). The Results section on adipokines reports an approximately 40% reduction in plasma TNF-α, not a 40-fold reduction. (LLM, conf=0.93)
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- Authors
- Wilkes, J. J., Lloyd, D. J., & Gekakis, N.
- Affiliations
- Scripps Research Institute (US)
- Genomics Institute of the Novartis Research Foundation (US)
- Corresponding author
- Gekakis, Nick
- ORCID
- Lloyd, David J.
- Venue
- Diabetes
- Publisher
- American Diabetes Association
- Published
- 2009-02-10
- Volume
- 58
- Issue
- 5
- Pages
- 1133-1143
- ISSN
- 0012-1797 (ISSN-L)
- 1939-327X
- PMC
- PMC2671051
- OpenAlex
- W2106719297
- Cited by
- 156
- References
- 26
- Citations by year
- 2026: 2 · 2025: 7 · 2024: 10 · 2023: 8 · 2022: 15 · 2021: 7 · 2020: 10 · 2019: 7 · 2018: 6 · 2017: 9 · 2016: 6 · 2015: 8 · 2014: 14 · 2013: 10 · 2012: 7
- FWCI
- 8.32
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Diabetes (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- myostatin, TNF-α, insulin resistance, obesity, high-fat diet, hepatic insulin sensitivity, skeletal muscle insulin sensitivity, hepatic steatosis, glucose tolerance, hepatic glucose production, adipose tissue inflammation
- MeSH terms
- Animals, Blood Glucose, Dietary Fats, Glucose, Heterozygote, Homozygote, Insulin Resistance, Liver, Mice, Inbred C57BL, Mice, Mutant Strains, Mutation, Obesity, Tumor Necrosis Factor-alpha, Glucose Clamp Technique, DNA Primers, Muscle, Skeletal, CD36 Antigens, Reverse Transcriptase Polymerase Chain Reaction, Metabolic Syndrome, Mice, Myostatin
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