PMID- 23835341 OWN - NLM STAT- MEDLINE DCOM- 20140117 LR - 20211021 IS - 1939-327X (Electronic) IS - 0012-1797 (Print) IS - 0012-1797 (Linking) VI - 62 IP - 12 DP - 2013 Dec TI - Direct effects of TNF-alpha on local fuel metabolism and cytokine levels in the placebo-controlled, bilaterally infused human leg: increased insulin sensitivity, increased net protein breakdown, and increased IL-6 release. PG - 4023-9 LID - 10.2337/db13-0138 [doi] AB - Tumor necrosis factor-alpha (TNF-alpha) has widespread metabolic actions. Systemic TNF-alpha administration, however, generates a complex hormonal and metabolic response. Our study was designed to test whether regional, placebo-controlled TNF-alpha infusion directly affects insulin resistance and protein breakdown. We studied eight healthy volunteers once with bilateral femoral vein and artery catheters during a 3-h basal period and a 3-h hyperinsulinemic-euglycemic clamp. One artery was perfused with saline and one with TNF-alpha. During the clamp, TNF-alpha perfusion increased glucose arteriovenous differences (0.91 +/- 0.17 vs. 0.74 +/- 0.15 mmol/L, P = 0.012) and leg glucose uptake rates. Net phenylalanine release was increased by TNF-alpha perfusion with concomitant increases in appearance and disappearance rates. Free fatty acid kinetics was not affected by TNF-alpha, whereas interleukin-6 (IL-6) release increased. Insulin and protein signaling in muscle biopsies was not affected by TNF-alpha. TNF-alpha directly increased net muscle protein loss, which may contribute to cachexia and general protein loss during severe illness. The finding of increased insulin sensitivity, which could relate to IL-6, is of major clinical interest and may concurrently act to provide adequate tissue fuel supply and contribute to the occurrence of systemic hypoglycemia. This distinct metabolic feature places TNF-alpha among the rare insulin mimetics of human origin. FAU - Bach, Ermina AU - Bach E AD - Medical Research Laboratories, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark. FAU - Nielsen, Roni R AU - Nielsen RR FAU - Vendelbo, Mikkel H AU - Vendelbo MH FAU - Moller, Andreas B AU - Moller AB FAU - Jessen, Niels AU - Jessen N FAU - Buhl, Mads AU - Buhl M FAU - K-Hafstrom, Thomas AU - K-Hafstrom T FAU - Holm, Lars AU - Holm L FAU - Pedersen, Steen B AU - Pedersen SB FAU - Pilegaard, Henriette AU - Pilegaard H FAU - Bienso, Rasmus S AU - Bienso RS FAU - Jorgensen, Jens O L AU - Jorgensen JO FAU - Moller, Niels AU - Moller N LA - eng SI - ClinicalTrials.gov/NCT01452958 PT - Journal Article PT - Randomized Controlled Trial PT - Research Support, Non-U.S. Gov't DEP - 20130708 PL - United States TA - Diabetes JT - Diabetes JID - 0372763 RN - 0 (Blood Glucose) RN - 0 (Cytokines) RN - 0 (Insulin) RN - 0 (Interleukin-6) RN - 0 (Tumor Necrosis Factor-alpha) SB - IM MH - Adult MH - Blood Glucose/metabolism MH - Cytokines/*blood MH - Energy Metabolism/*drug effects MH - Femoral Artery/drug effects/metabolism MH - Glucose Clamp Technique MH - Humans MH - Insulin/metabolism MH - Insulin Resistance/*physiology MH - Interleukin-6/*metabolism MH - Leg/blood supply MH - Male MH - Muscle, Skeletal/drug effects/metabolism MH - Single-Blind Method MH - Tumor Necrosis Factor-alpha/*pharmacology PMC - PMC3837036 EDAT- 2013/07/10 06:00 MHDA- 2014/01/18 06:00 PMCR- 2014/12/01 CRDT- 2013/07/10 06:00 PHST- 2013/07/10 06:00 [entrez] PHST- 2013/07/10 06:00 [pubmed] PHST- 2014/01/18 06:00 [medline] PHST- 2014/12/01 00:00 [pmc-release] AID - db13-0138 [pii] AID - 0138 [pii] AID - 10.2337/db13-0138 [doi] PST - ppublish SO - Diabetes. 2013 Dec;62(12):4023-9. doi: 10.2337/db13-0138. Epub 2013 Jul 8.