Abstract
Interleukin 15 (IL-15) has recently been proposed as a circulating myokine involved in glucose uptake and utilization in skeletal muscle. However, the role and mechanism of IL-15 in exercise improving insulin resistance (IR) is unclear. Here, we investigated the alteration in expression of IL-15 and IL-15 receptor α (IL-15Rα) in skeletal muscle during treadmill running in rats with IR induced by a high-fat diet (HFD) and elucidated the mechanism of the anti-IR effects of IL-15. At 20 weeks of HFD, rats showed severe IR, with increased levels of fasting blood sugar and plasma insulin, impaired glucose tolerance, and reduced glucose transport activity. IL-15 immunoreactivity and mRNA level in gastrocnemius muscle were decreased markedly as compared with controls. IL-15Rα protein and mRNA levels in both soleus and gastrocnemius muscle were significantly decreased, which might attenuate the signaling or secretion of IL-15 in muscle. Eight-week treadmill running completely ameliorated HFD-induced IR and reversed the downregulated level of IL-15 and IL-15Rα in skeletal muscle of HFD-fed rats. To investigate whether IL-15 exerts its anti-IR effects directly in muscle, we pre-incubated muscle strips with the endoplasmic reticulum stress (ERS) inducer dithiothreitol (DTT) or tunicamycin (Tm); IL-15 treatment markedly decreased the protein expression of the ERS markers 78-kDa glucose-regulated protein, 94-kDa glucose-regulated protein and C/EBP homologous protein and inhibited ERS induced by DTT or Tm. Therefore, treadmill running promoted skeletal IL-15 and IL-15Rα expression in HFD-induced IR in rats. The inhibitory effect of IL-15 on ERS may be involved in improved insulin sensitivity with exercise training.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant nos. 81270921 and 81170082).
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All animal care and experimental protocols complied with the Animal Management Rules (document No. 55, 2001) of the Ministry of Health of the People’s Republic of China and the guide for the Care and Use of the Laboratory Animals of Peking University Health Science Center.
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Yang, HT., Luo, LJ., Chen, WJ. et al. IL-15 expression increased in response to treadmill running and inhibited endoplasmic reticulum stress in skeletal muscle in rats. Endocrine 48, 152–163 (2015). https://doi.org/10.1007/s12020-014-0233-y
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DOI: https://doi.org/10.1007/s12020-014-0233-y