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Am J Physiol Regul Integr Comp Physiol 282: R1762-R1772, 2002. First published February 7, 2002; doi:10.1152/ajpregu.00766.2001
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Vol. 282, Issue 6, R1762-R1772, June 2002

Site-specific modulation of LPS-induced fever and interleukin-1beta expression in rats by interleukin-10

Annemarie Ledeboer, Rob Binnekade, John J. P. Brevé, John G. J. M. Bol, Fred J. H. Tilders, and Anne-Marie Van Dam

Research Institute Neurosciences Free University, Department of Medical Pharmacology, VU University Medical Center, 1081 BT Amsterdam, The Netherlands

Bacterial lipopolysaccharide (LPS) induces fever that is mediated by pyrogenic cytokines such as interleukin (IL)-1beta . We hypothesized that the anti-inflammatory cytokine IL-10 modulates the febrile response to LPS by suppressing the production of pyrogenic cytokines. In rats, intravenous but not intracerebroventricular infusion of IL-10 was found to attenuate fever induced by peripheral administration of LPS (10 µg/kg iv). IL-10 also suppressed LPS-induced IL-1beta production in peripheral tissues and in the brain stem. In contrast, central administration of IL-10 attenuated the febrile response to central LPS (60 ng/rat icv) and decreased IL-1beta production in the hypothalamus and brain stem but not in peripheral tissues and plasma. Furthermore, intravenous LPS upregulated expression of IL-10 receptor (IL-10R1) mRNA in the liver, whereas intracerebroventricular LPS enhanced IL-10R1 mRNA in the hypothalamus. We conclude that IL-10 modulates the febrile response by acting in the periphery or in the brain dependent on the primary site of inflammation and that its mechanism of action most likely involves inhibition of local IL-1beta production.

inflammation; brain; thermoregulation; endotoxin; cytokine


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