Cited by 47Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismMuscle Physiology and Disorders

Overexpression of interleukin-15 in mice promotes resistance to diet-induced obesity, increased insulin sensitivity, and markers of oxidative skeletal muscle metabolism

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Quinn, LeBris, Anderson, Conner, Pistilli, Wolden-Hanson·2011·International Journal of Interferon Cytokine and Mediator Research

Abstract

Interleukin-15 (IL-15) is a cytokine that is highly expressed in skeletal muscle. In addition to its well-characterized effects on innate immunity, IL-15 has been proposed to modulate skeletal muscle and adipose tissue mass, as well as insulin sensitivity. In the present study, an IL-15 gain-of-function model, transgenic mice with skeletal muscle-specific oversecretion of IL-15 (IL-15 Tg mice), was utilized to test the hypotheses that IL-15 promotes insulin sensitivity and resistance to diet-induced obesity (DIO) by increasing circulating adiponectin levels, and that IL-15 regulates skeletal muscle metabolism without inducing overt muscle hypertrophy. Compared to closely related control mice, IL-15 Tg mice exhibited lower total body fat following high-fat feeding, lower intra-abdominal fat following both low- and high-fat feeding, and greater insulin sensitivity. However, this was not accompanied by increased total or high molecular weight serum adiponectin levels in IL-15 Tg mice. While overall lean body mass did not differ, IL-15 Tg mice exhibited increased mass of the oxidative soleus muscle, and increased expression of mRNA encoding the slow isoform of troponin I (TnnI 1) in the predominately glycolytic extensor digitorum longus muscle. Skeletal muscle tissue from IL-15 Tg mice also exhibited alterations in the expression of several genes associated with fatty acid metabolism, such as SIRT1, SIRT4, and uncoupling protein 2 (UCP2). These findings suggest changes in oxidative metabolism, rather than induction of adiponectin expression, appear to be responsible for the DIO-resistant and more insulin-sensitive phenotype of IL-15 Tg mice.

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Authors
Quinn, L., Anderson, Conner, Pistilli, & Wolden-Hanson
Affiliations
  • University of Washington (US)
  • VA Puget Sound Health Care System (US)
  • University of Pennsylvania (US)
Venue
International Journal of Interferon Cytokine and Mediator Research
Published
2011-04
Volume
3
Pages
29
ISSN
1179-139X (ISSN-L)
OpenAlex
W2077817563
Cited by
47
References
60
Citations by year
2026: 2 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 6 · 2021: 1 · 2020: 9 · 2019: 3 · 2018: 5 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 1 · 2012: 3
FWCI
1.68
Type
journal article
Language
en
Open access
Locations
  • International Journal of Interferon Cytokine and Mediator Research (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion, cc-by-nc)
  • PubMed Central (acceptedVersion, cc-by-nc)
  • Dove Medical Press (Taylor and Francis Group) (submittedVersion, cc-by-nc)
Funders
  • University of Washington
  • National Institutes of Health
  • National Institute on Aging (R01AG024136, RO1AG024136, P01AG001751, P30AG013280)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK017047)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (T32AR053461)
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
IL-15, diet-induced obesity, insulin sensitivity, skeletal muscle metabolism, oxidative metabolism, adiponectin, transgenic mice, soleus muscle, extensor digitorum longus, troponin I isoforms, fatty acid metabolism, SIRT1, SIRT4, UCP2, high-fat diet, intra-abdominal fat

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