Intracerebroventricular injection of interleukin-1 beta induces hyperalgesia in rats - PubMed (original) (raw)
Intracerebroventricular injection of interleukin-1 beta induces hyperalgesia in rats
T Oka et al. Brain Res. 1993.
Abstract
To determine whether interleukin-1 beta (IL-1 beta) in the brain may modulate nociception, recombinant human IL-1 beta (rhIL-1 beta) (1 pg/kg to 1 microgram/kg) was microinjected into the lateral cerebral ventricle of rats and the latency before initiating the licking of their hindpaws after being placed on a hot plate (50.0 +/- 0.1 degrees C) was measured. A significant reduction of the paw-lick latency was observed after injections of nonpyrogenic doses (10 pg/kg to 1 ng/kg) of rhIL-1 beta, showing a maximal response at a dose of 100 pg/kg which began to appear 5 min after injection, reached a peak within 30 min and then gradually subsided. An increase in the amount of rhIL-1 beta to > 1 ng/kg (up to 1 microgram/kg) had no effect on the nociceptive threshold. The rhIL-1 beta-induced hyperalgesia was completely abolished by pretreatment with an IL-1 receptor antagonist (IL-1ra) or Na salicylate. Similar pretreatment with alpha-melanocyte-stimulating hormone (alpha-MSH) also inhibited the rhIL-1 beta-induced hyperalgesia. However, pretreatment with alpha-helical corticotropin-releasing factor (CRF)9-41 failed to affect it. The results suggest that IL-1 beta in the brain produces hyperalgesia by its receptor-mediated and prostaglandin-dependent action which is sensitive to alpha-MSH. The hyperalgesic action of central IL-1 does not appear to depend on the CRF system.
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