Cited by 60Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismLipid metabolism and biosynthesis

IL-15 concentrations in skeletal muscle and subcutaneous adipose tissue in lean and obese humans: Local effects of IL-15 on adipose tissue lipolysis

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Pierce, Joseph R., Maples, Jill M., Hickner, Robert C.·2015·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Animal/cell investigations indicate that there is a decreased adipose tissue mass resulting from skeletal muscle (SkM) IL-15 secretion (e.g., SkM-blood-adipose tissue axis). IL-15 could regulate fat mass accumulation in obesity via lipolysis, although this has not been investigated in humans. Therefore, the purpose was to examine whether SkM and/or subcutaneous adipose tissue (SCAT) IL-15 concentrations were correlated with SCAT lipolysis in lean and obese humans and determine whether IL-15 perfusion could induce lipolysis in human SCAT. Local SkM and abdominal SCAT IL-15 (microdialysis) and circulating IL-15 (blood) were sampled in lean (BMI: 23.1 ± 1.9 kg/m(2); n = 10) and obese (BMI: 34.7 ± 3.5 kg/m(2); n = 10) subjects at rest/during 1-h cycling exercise. Lipolysis (SCAT interstitial glycerol concentration) was compared against local/systemic IL-15. An additional probe in SCAT was perfused with IL-15 to assess direct lipolytic responses. SkM IL-15 was not different between lean and obese subjects (P = 0.45), whereas SCAT IL-15 was higher in obese vs. lean subjects (P = 0.02) and was correlated with SCAT lipolysis (r = 0.45, P = 0.05). Exercise increased SCAT lipolysis in lean and obese (P < 0.01), but exercise-induced SCAT lipolysis changes were not correlated with exercise-induced SCAT IL-15 changes. Microdialysis perfusion resulting in physiological IL-15 concentrations in the adipose tissue interstitium increased lipolysis in lean (P = 0.04) but suppressed lipolysis in obese (P < 0.01). Although we found no support for a human IL-15 SkM-blood-adipose tissue axis, IL-15 may be produced in/act on the abdominal SCAT depot. The extent to which this autocrine/paracrine IL-15 action regulates human body composition remains unknown.

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Crossref · 10.1152/ajpendo.00575.2014

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Authors
Pierce, J. R., Maples, J. M., & Hickner, R. C.
Affiliations
East Carolina University (US)
Corresponding author
Hickner, Robert C.
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
2015-06-15
Volume
308
Issue
12
Pages
E1131-E1139
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W2012042482
Cited by
60
References
34
Citations by year
2025: 3 · 2024: 10 · 2023: 2 · 2022: 7 · 2021: 5 · 2020: 5 · 2019: 6 · 2018: 9 · 2017: 6 · 2016: 6 · 2015: 1
FWCI
5.75
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American College of Sports Medicine (ACSM) (2012 Doctoral Student Grant)
  • HHS | NIH | National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (R01 DK-071081)
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 › Biochemistry › Lipid metabolism and biosynthesis
Keywords
IL-15, skeletal muscle, subcutaneous adipose tissue, adipose tissue lipolysis, obesity, physical activity, microdialysis, glycerol, body composition
MeSH terms
Adipose Tissue, Adolescent, Adult, Female, Humans, Lipolysis, Male, Obesity, Rest, Thinness, Exercise, Microdialysis, Muscle, Skeletal, Interleukin-15, Subcutaneous Fat, Young Adult

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