Cited by 406Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismMuscle Physiology and Disorders

Myonectin (CTRP15), a novel myokine that links skeletal muscle to systemic lipid homeostasis

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Seldin, Marcus M., Peterson, Jonathan M., Byerly, Mardi S., Wei, Zhikui, Wong, G. William·2012·Journal of Biological Chemistry

Abstract

Skeletal muscle plays important roles in whole-body glucose and fatty acid metabolism. However, muscle also secretes cytokines and growth factors (collectively termed myokines) that can potentially act in an autocrine, a paracrine, and/or an endocrine manner to modulate metabolic, inflammatory, and other processes. Here, we report the identification and characterization of myonectin, a novel myokine belonging to the C1q/TNF-related protein (CTRP) family. Myonectin transcript was highly induced in differentiated myotubes and predominantly expressed by skeletal muscle. Circulating levels of myonectin were tightly regulated by the metabolic state; fasting suppressed, but refeeding dramatically increased, its mRNA and serum levels. Although mRNA and circulating levels of myonectin were reduced in a diet-induced obese state, voluntary exercise increased its expression and circulating levels. Accordingly, myonectin transcript was up-regulated by compounds (forskolin, epinephrine, ionomycin) that raise cellular cAMP or calcium levels. In vitro, secreted myonectin forms disulfide-linked oligomers, and when co-expressed, forms heteromeric complexes with other members of the C1q/TNF-related protein family. In mice, recombinant myonectin administration reduced circulating levels of free fatty acids without altering adipose tissue lipolysis. Consistent with this, myonectin promoted fatty acid uptake in cultured adipocytes and hepatocytes, in part by up-regulating the expression of genes (CD36, FATP1, Fabp1, and Fabp4) that promote lipid uptake. Collectively, these results suggest that myonectin links skeletal muscle to lipid homeostasis in liver and adipose tissue in response to alterations in energy state, revealing a novel myonectin-mediated metabolic circuit.

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Crossref · 10.1074/jbc.m111.336834

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Authors
Seldin, M. M., Peterson, J. M., Byerly, M. S., Wei, Z., & Wong, G. W.
Affiliations
Johns Hopkins University (US)
Corresponding author
Wong, G. William
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2012-04
Volume
287
Issue
15
Pages
11968-11980
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2083855314
Cited by
406
References
46
Citations by year
2026: 27 · 2025: 27 · 2024: 33 · 2023: 30 · 2022: 34 · 2021: 32 · 2020: 44 · 2019: 35 · 2018: 31 · 2017: 22 · 2016: 24 · 2015: 20 · 2014: 22 · 2013: 19 · 2012: 5
FWCI
15.80
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Commons - East Tennessee State University (East Tennessee State University) (submittedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK-084171, T32DK007751, F32DK084607, P30DK079637, R01DK084171)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
myonectin, myokines, skeletal muscle, lipid homeostasis, free fatty acids, fatty acid uptake, adipocytes, hepatocytes, diet-induced obesity, fasting and refeeding, voluntary exercise, cAMP signaling, calcium signaling, heteromeric protein complexes, CD36, FATP1, FABP1, FABP4, energy metabolism
MeSH terms
Animals, Cells, Cultured, Fatty Acids, Female, Gene Expression Regulation, Glycosylation, Homeostasis, Humans, Male, Mice, Inbred C57BL, Molecular Sequence Data, Motor Activity, Muscle Proteins, Nutritional Status, Obesity, Protein Binding, Rabbits, Transcription, Genetic, Cytokines, Protein Structure, Tertiary, Muscle, Skeletal, Muscle Fibers, Skeletal, Lipid Metabolism, Mice, Adipokines, Protein Multimerization

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