PMID- 24702712 OWN - NLM STAT- MEDLINE DCOM- 20150514 LR - 20220129 IS - 1463-1326 (Electronic) IS - 1462-8902 (Linking) VI - 16 IP - 10 DP - 2014 Oct TI - Interleukin-6 in combination with the interleukin-6 receptor stimulates glucose uptake in resting human skeletal muscle independently of insulin action. PG - 931-6 LID - 10.1111/dom.12299 [doi] AB - AIM: To examine if the physiological concentrations of both interleukin-6 (IL-6), in combination with IL-6 receptor (IL-6R), are able to stimulate glucose uptake in human skeletal muscle and to identify the associated signalling pathways. METHODS: Skeletal muscle tissue (~60 mg) obtained from healthy female volunteers via muscle biopsy was subjected to incubation in the absence or presence of insulin (60 microU/ml), recombinant human IL-6 (rhIL-6) (4 ng/ml) or a combination of rhIL-6 (4 ng/ml) and rhIL-6R (100 ng/ml) for 30 min, with glucose transport measured for each incubation. Western blot analysis was conducted on key signalling proteins, protein kinase B (PKB/Akt), adenosine monophosphate kinase (AMPK) and mammalian target of rapamycin (mTOR) to gain an early insight into any differing transport mechanisms. RESULTS: Human skeletal muscle exhibited increased glucose uptake with insulin (1.85-fold; p < 0.05) and stimulated phosphorylation of PKB/Akt and AMPK (0.98 +/- 0.23 and 1.49 +/- 0.13, respectively, phosphorylated: total; p < 0.05). IL-6/IL-6R increased phosphorylation of mTOR (fourfold, p < 0.05) compared to insulin, IL-6 alone and basal control. IL-6 did not stimulate glucose uptake but combined with IL-6R, induced 1.5-fold increase in glucose uptake (p < 0.05) and phosphorylation of AMPK (0.95 +/- 0.19; phosphorylated: total, p < 0.05). CONCLUSIONS: IL-6 in combination with IL-6R and not IL-6 alone increased glucose uptake in human skeletal muscle. IL-6/IL-6R-mediated glucose uptake occurred independently of PKB/Akt phosphorylation, showing that IL-6/IL-6R-induced glucose uptake is dependent on a divergent pathway. CI - (c) 2014 John Wiley & Sons Ltd. FAU - Saini, A AU - Saini A AD - School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough, UK. FAU - Faulkner, S H AU - Faulkner SH FAU - Moir, H AU - Moir H FAU - Warwick, P AU - Warwick P FAU - King, J A AU - King JA FAU - Nimmo, M A AU - Nimmo MA LA - eng GR - MR/K00414X/1/MRC_/Medical Research Council/United Kingdom PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20140427 PL - England TA - Diabetes Obes Metab JT - Diabetes, obesity & metabolism JID - 100883645 RN - 0 (Interleukin-6) RN - 0 (Receptors, Interleukin-6) RN - EC 2.7.1.1 (MTOR protein, human) RN - EC 2.7.11.1 (Proto-Oncogene Proteins c-akt) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) RN - IY9XDZ35W2 (Glucose) SB - IM MH - Biological Transport MH - Female MH - Glucose/*metabolism MH - Humans MH - Interleukin-6/*metabolism/pharmacology MH - Muscle, Skeletal/*metabolism/physiology MH - Phosphorylation MH - Proto-Oncogene Proteins c-akt/*metabolism MH - Receptors, Interleukin-6/drug effects/*metabolism MH - Signal Transduction MH - TOR Serine-Threonine Kinases/*metabolism OTO - NOTNLM OT - glucose uptake OT - human skeletal muscle OT - insulin OT - interleukin OT - interleukin-6 and receptor EDAT- 2014/04/08 06:00 MHDA- 2015/05/15 06:00 CRDT- 2014/04/08 06:00 PHST- 2013/11/06 00:00 [received] PHST- 2014/02/26 00:00 [revised] PHST- 2014/03/31 00:00 [accepted] PHST- 2014/04/08 06:00 [entrez] PHST- 2014/04/08 06:00 [pubmed] PHST- 2015/05/15 06:00 [medline] AID - 10.1111/dom.12299 [doi] PST - ppublish SO - Diabetes Obes Metab. 2014 Oct;16(10):931-6. doi: 10.1111/dom.12299. Epub 2014 Apr 27.