Skeletal muscle interleukin-6 regulates metabolic factors in iWAT during HFD and exercise training

JG Knudsen, L Bertholdt, E Joensen, SB Lassen, J Hidalgo, H. Pilegaard

Research output: Contribution to journalArticleResearch

17 Citations (Scopus)

Abstract

© 2015 The Obesity Society. Objective To investigate the role of skeletal muscle (SkM) interleukin (IL)-6 in the regulation of adipose tissue metabolism. Methods Muscle-specific IL-6 knockout (IL-6 MKO) and IL-6<sup>loxP/loxP</sup> (Floxed) mice were subjected to standard rodent diet (Chow), high-fat diet (HFD), or HFD in combination with exercise training (HFD ExTr) for 16 weeks. Results Total fat mass increased (P < 0.05) in both genotypes with HFD. However, HFD IL-6 MKO mice had lower (P < 0.05) inguinal adipose tissue (iWAT) mass than HFD Floxed mice. Accordingly, iWAT glucose transporter 4 (GLUT4) protein content, 5′AMP activated protein kinase (AMPK)<sup>Thr172</sup> phosphorylation, and fatty acid synthase (FAS) mRNA content were lower (P < 0.05) in IL-6 MKO than Floxed mice on Chow. In addition, iWAT AMPK<sup>Thr172</sup> and hormone-sensitive lipase (HSL)<sup>Ser565</sup> phosphorylation as well as perilipin protein content was higher (P < 0.05) in HFD IL-6 MKO than HFD Floxed mice, and pyruvate dehydrogenase E1α (PDH-E1α) protein content was higher (P < 0.05) in HFD ExTr IL-6 MKO than HFD ExTr Floxed mice. Conclusions These findings indicate that SkM IL-6 affects iWAT mass through regulation of glucose uptake capacity as well as lipogenic and lipolytic factors.
Original languageEnglish
Pages (from-to)1616-1624
JournalObesity
Volume23
Issue number8
DOIs
Publication statusPublished - 1 Jan 2015

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