alexa Exercise and IL-6 infusion inhibit endotoxin-induced TNF-alpha production in humans.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Starkie R, Ostrowski SR, Jauffred S, Febbraio M, Pedersen BK

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Abstract During "nondamaging" exercise, skeletal muscle markedly releases interleukin (IL)-6, and it has been suggested that one biological role of this phenomenon is to inhibit the production of tumor necrosis factor (TNF)- alpha, which is known to cause pathogenesis such as insulin resistance and atherosclerosis. To test this hypothesis, we performed three experiments in which eight healthy males either rested (CON), rode a bicycle for 3 h (EX), or were infused with recombinant human IL-6 (rhIL-6) for 3 h while they rested. After 2.5 h, the volunteers received a bolus of Escherichia coli lipopolysaccharide endotoxin (0.06 ng/kg) i.v. to induce low-grade inflammation. In CON, plasma TNF-alpha increased significantly in response to endotoxin. In contrast, during EX, which resulted in elevated IL-6, and rhIL-6, the endotoxin-induced increase in TNF-alpha was totally attenuated. In conclusion, physical exercise and rhIL-6 infusion at physiological concentrations inhibit endotoxin-induced TNF-alpha production in humans. Hence, these data provide the first experimental evidence that physical activity mediates antiinflammatory activity and suggest that the mechanism include IL-6, which is produced by and released from exercising muscles. This article was published in FASEB J and referenced in Journal of Diabetes & Metabolism

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