Acute IL-6 treatment increases fatty acid turnover in elderly humans in vivo and in tissue culture in vitro

American Journal of Physiology. Endocrinology and Metabolism
E W PetersenBente Klarlund Pedersen

Abstract

To determine whether IL-6 increases lipolysis and fat oxidation in patients with type 2 diabetes and/or whether it exerts this effect independently of changes to the hormonal milieu, patients with type 2 diabetes (D) and healthy control subjects (CON) underwent recombinant human (rh)IL-6 infusion for 3 h. Rates of appearance (Ra) and disappearance (Rd) of [U-(13C)]palmitate and [6,6-(2H2)]glucose were determined. rhIL-6 infusion increased (P < 0.05) palmitate Ra and Rd in a similar fashion in both groups. Neither plasma glucose concentration nor glucose Ra/Rd was affected by rhIL-6 infusion in either group, whereas rhIL-6 infusion resulted in a reduction (P < 0.05) in circulating insulin in D. Plasma growth hormone (GH) was increased (P < 0.05) by IL-6 in CON, and cortisol increased (P < 0.05) in response to IL-6 in both groups. To determine whether IL-6 was exerting its effect directly or through activation of these hormones, we performed cell culture experiments. Fully differentiated 3T3-L1 adipocytes were treated with PBS (control) IL-6, or IL-6 plus dexamethasone and GH. IL-6 treatment alone increased (P < 0.05) lipolysis, but this effect was reduced by the addition of dexamethasone and GH such that IL-6 plus dexamethasone ...Continue Reading

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