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Circulating IL-6 levels are elevated in obesity. Although IL-6 is expressed in adipose tissue, neither its regulation nor cell of origin is well characterized. Here we investigated the beta-adrenergic regulation of IL-6 release in a combination of studies on humans and animals in vivo and cultured adipocytes in vitro. Human in vivo study: Human volunteers were infused with isoproterenol, norepinephrine, or saline [4 M:4F; mean (SD) age 35.5 (5.8) yr; body mass index 24.6 (4.2) kg/m(-2)]. Plasma IL-6 levels increased during a 3-h infusion of isoproterenol (P = 0.01) and fell 2 h post infusion (P = 0.05). IL-6 levels did not change significantly with either norepinephrine or saline. Murine in vivo study: C57BL6/J male mice were injected ip with dobutamine (beta(1) agonist), clenbuterol (beta(2)), CL316243 (beta(3)), or saline placebo. Plasma IL-6 levels at 3 h were increased by clenbuterol (P = 0.02) and CL316243 (P = 0.02) but not dobutamine (P = 0.51), compared with placebo.

β-Adrenergic Regulation of IL-6 Release from Adipose Tissue:In Vivoandin VitroStudies