Importance of brain IL-1 type II receptors in fever and thermogenesis in the rat.
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.
Luheshi
G
G
Department of Physiological Sciences, University of Manchester, United Kingdom.
Hopkins
S J
SJ
Lefeuvre
R A
RA
Dascombe
M J
MJ
Ghiara
P
P
Rothwell
N J
NJ
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology; D001833:Body Temperature Regulation / Q000187:drug effects / Q000502:physiology*; D001921:Brain / Q000378:metabolism*; D004731:Endotoxins / Q000494:pharmacology; D005334:Fever / Q000139:chemically induced / Q000378:metabolism*; D007275:Injections, Intravenous; D007276:Injections, Intraventricular; D007375:Interleukin-1 / Q000494:pharmacology; D008297:Male; D051379:Mice; D010101:Oxygen Consumption / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D017472:Receptors, Interleukin-1 / Q000145:classification / Q000276:immunology / Q000378:metabolism*; D011994:Recombinant Proteins
D000911:Antibodies, Monoclonal; D004731:Endotoxins; D007375:Interleukin-1; D017472:Receptors, Interleukin-1; D011994:Recombinant Proteins