Specificity of interleukin-1beta-induced changes in monoamine concentrations in hypothalamic nuclei: blockade by interleukin-1 receptor antagonist.
The purpose of this study was to examine specificity in the effects of interleukin-1beta (IL-1beta) on monoamines in various areas of the hypothalamus. Adult male rats were injected i.p. with saline or 2.5 or 5.0 microg of IL-1beta or were pretreated with 500 microg of IL-1 receptor antagonist (IL-1ra) followed 5 min later by 5 microg of IL-1beta. The paraventricular nucleus (PVN), arcuate nucleus (AN), median eminence (ME), and medial preoptic area (MPA) were microdissected and analyzed for neurotransmitter concentrations by high-performance liquid chromatography with electrochemical detection (HPLC-EC). In the PVN, IL treatment produced significant increases in the concentrations of norepinephrine (NE), dopamine (DA), DA metabolite dihydroxyphenylacetic acid (DOPAC), serotonin (5-HT), and its metabolite 5-hydroxyindoleacetic acid (5-HIAA). IL-1 treatment increased the concentrations of NE and DA in the AN but only of NE in the ME, and it was without any effect in the MPA. Pretreatment with IL-1ra completely blocked the IL-1 effects. It is concluded that IL-1 induces highly specific changes in monoamine metabolism in the hypothalamus, and the nature of these changes depends on specific hypothalamic nuclei.
MohanKumar
S M
SM
Neuroendocrine Research Laboratory, Kansas State University, Manhattan 66506, USA.
MohanKumar
P S
PS
Quadri
S K
SK
D000704:Analysis of Variance; D000818:Animals; D001111:Arcuate Nucleus of Hypothalamus / Q000187:drug effects; D001679:Biogenic Amines / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D004563:Electrochemistry; D007031:Hypothalamus / Q000187:drug effects* / Q000378:metabolism; D007375:Interleukin-1 / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D008297:Male; D008473:Median Eminence / Q000187:drug effects; D010286:Paraventricular Hypothalamic Nucleus / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley
D001679:Biogenic Amines; D007375:Interleukin-1