Cited by 105Cytokine Signaling Pathways and InteractionsMetabolism, Diabetes, and CancerExercise and Physiological Responses

IL-15 activates the Jak3/STAT3 signaling pathway to mediate glucose uptake in skeletal muscle cells

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Krolopp, James E., Thornton, Shantaé M., Abbott, Marcia J.·2016·Frontiers in Physiology

Abstract

Myokines are specialized cytokines that are secreted from skeletal muscle (SKM) in response to metabolic stimuli, such as exercise. Interleukin-15 (IL-15) is a myokine with potential to reduce obesity and increase lean mass through induction of metabolic processes. It has been previously shown that IL-15 acts to increase glucose uptake in SKM cells. However, the downstream signals orchestrating the link between IL-15 signaling and glucose uptake have not been fully explored. Here we employed the mouse SKM C2C12 cell line to examine potential downstream targets of IL-15-induced alterations in glucose uptake. Following differentiation, C2C12 cells were treated overnight with 100 ng/ml of IL-15. Activation of factors associated with glucose metabolism (Akt and AMPK) and known downstream targets of IL-15 (Jak1, Jak3, STAT3, and STAT5) were assessed with IL-15 stimulation. IL-15 stimulated glucose uptake and GLUT4 translocation to the plasma membrane. IL-15 treatment had no effect on phospho-Akt, phospho-Akt substrates, phospho-AMPK, phospho-Jak1, or phospho-STAT5. However, with IL-15, phospho-Jak3 and phospho-STAT3 levels were increased along with increased interaction of Jak3 and STAT3. Additionally, IL-15 induced a translocation of phospho-STAT3 from the cytoplasm to the nucleus. We have evidence that a mediator of glucose uptake, HIF1α, expression was dependent on IL-15 induced STAT3 activation. Finally, upon inhibition of STAT3 the positive effects of IL-15 on glucose uptake and GLUT4 translocation were abolished. Taken together, we provide evidence for a novel signaling pathway for IL-15 acting through Jak3/STAT3 to regulate glucose metabolism.

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Crossref · 10.3389/fphys.2016.00626

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Authors
Krolopp, J. E., Thornton, S. M., & Abbott, M. J.
Affiliations
  • Chapman University (US)
  • University of Southern California (US)
Corresponding author
Abbott, Marcia J.
Venue
Frontiers in Physiology
Published
2016-12-20
Volume
7
Pages
626-626
ISSN
1664-042X (ISSN-L)
OpenAlex
W2560777271
Cited by
104
References
72
Citations by year
2026: 11 · 2025: 8 · 2024: 9 · 2023: 8 · 2022: 16 · 2021: 14 · 2020: 13 · 2019: 9 · 2018: 8 · 2017: 8
FWCI
4.47
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Physiology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Chapman University Digital Commons (Chapman University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Chapman University (16SDG30680003)
  • American College of Sports Medicine
  • American Heart Association
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
IL-15, myokines, glucose uptake, skeletal muscle, GLUT4 translocation, HIF-1α, Akt, AMPK, STAT3 nuclear translocation, C2C12 myoblasts, skeletal muscle glucose metabolism

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