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Importance of brain IL-1 type II receptors in fever and thermogenesis in the rat.
Luheshi G, Hopkins S, Lefeuvre R, Dascombe M, Ghiara P, Rothwell NJ
Am J Physiol. 1993;265( 4 Pt 1):E585-91.
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Abstract
Interleukin-1 (IL-1) acts centrally to induce fever and thermogenesis in rodents. The central actions of IL-1 alpha and IL-1 beta apparently involve different mechanisms, and the effects of IL-1 beta are not consistent with interaction with a type I (IL-1RI) 80-kDa receptor. In the present study the involvement of the type II IL-1 receptor (IL-1RII) was tested in the rat by examining the effects of central injection of a monoclonal antibody (ALVA-42), which blocks the IL-1RII. Pretreatment of rats with ALVA-42 (6 micrograms icv) inhibited the thermogenic and pyrogenic responses to intracerebroventricular injection of 5 ng (but not 50 ng) of IL-1 beta in conscious rats but did not significantly modify responses to IL-1 alpha. ALVA-42 also failed to modify the responses to peripherally administered IL-1 beta (1 microgram) but significantly attenuated the pyrogenic and thermogenic responses to peripheral (125 micrograms) or central (1 microgram) injection of endotoxin. These data indicate that IL-1RII mediates the central effects of a low dose of IL-1 beta, but not IL-1 alpha, on fever and thermogenesis in the rat. They also imply that responses to endotoxin are due, at least in part, to the activation of IL-1RII by IL-1 beta released within the brain and that effects of peripherally injected IL-1 beta involve different mechanisms, probably associated with IL-1RI.
Keyword(s)
Animals; Injections, Intravenous; Injections, Intraventricular; Male; Mice; Rats; Rats, Sprague-Dawley; Recombinant Proteins; Support, Non-U.S. Gov't; chemically induced: Fever; classification: Receptors, Interleukin-1; drug effects: Body Temperature Regulation; drug effects: Oxygen Consumption; immunology: Antibodies, Monoclonal; metabolism: Brain; pharmacology: Endotoxins; pharmacology: Interleukin-1