Effect of central and continuous intravenous injection of interleukin-1 beta on brain c-fos expression in the rat: involvement of prostaglandins.
Utilizing immunohistochemistry for the c-fos protein to detect neuronal activity, we examined the effects of continuous intravenous and intracerebroventricular infusion of interleukin (IL)-1 beta in the rat brain, and the involvement of prostaglandins (PGs) in IL-1 beta-induced c-fos expression. Continuous intravenous infusion of IL-1 beta (10 ng/min) markedly augmented c-fos expression in the paraventricular (PVN) and the supraoptic (SON) nuclei of the hypothalamus as well as in the central amygdaloid nucleus (CeA). The number of IL-1 beta-induced c-fos-positive cells in the PVN and SON was significantly lower in rats pretreated with indomethacin than in vehicle-treated rats. However, the number of IL-1 beta-induced c-fos-positive cells in the CeA remained unchanged. c-fos protein was induced after intracerebroventricular infusion of IL-1 beta (200 ng) in the PVN, SON, and arcuate nuclei of the hypothalamus, and in the CeA. The induction of c-fos immunoreactivity by central administration of IL-1 beta was blocked by indomethacin (500 micrograms/rat), except in the CeA. These findings suggest that PGs are involved in the complex transmission of signals from circulating or central IL-1 beta to hypothalamic neurons.
Niimi
M
M
Department of Clinical Laboratory Medicine, Kagawa Medical School, Japan.
Sato
M
M
Wada
Y
Y
Takahara
J
J
Kawanishi
K
K
D000679:Amygdala / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D001111:Arcuate Nucleus of Hypothalamus / Q000187:drug effects / Q000378:metabolism; D001921:Brain / Q000187:drug effects* / Q000378:metabolism; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects*; D016762:Genes, fos; D007124:Immunoenzyme Techniques; D007213:Indomethacin / Q000494:pharmacology; D007275:Injections, Intravenous; D007276:Injections, Intraventricular; D007375:Interleukin-1 / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D009419:Nerve Tissue Proteins / Q000096:biosynthesis*; D010286:Paraventricular Hypothalamic Nucleus / Q000187:drug effects / Q000378:metabolism; D011453:Prostaglandins / Q000502:physiology*; D016760:Proto-Oncogene Proteins c-fos / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D013495:Supraoptic Nucleus / Q000187:drug effects / Q000378:metabolism
D016861:Cyclooxygenase Inhibitors; D007375:Interleukin-1; D009419:Nerve Tissue Proteins; D011453:Prostaglandins; D016760:Proto-Oncogene Proteins c-fos; D007213:Indomethacin