title: Interleukin-1 induces analgesia in mice by a central action.
abstract: The effect of interleukin-1 together with lipopolysaccharide, tumor necrosis factor and interferon on a pain-like response was investigated with the phenylquinone-induced writhing test in mice. Recombinant human interleukin-1 alpha (rHu-IL-1 alpha) inhibited writhing dose relatedly at doses of 0.25-5 micrograms/kg i.v., and its potency was about 1000 times that of morphine on a molar basis. Potent anti-writhing activity was also seen after an i.v. dose of recombinant human tumor necrosis factor (rHu-TNF) and mouse alpha-interferon (mIFN alpha). Lipopolysaccharide, unlike rHu-IL-1 alpha, needed a lag time of about 1 h to develop its anti-writhing action. The relative potency ratios of intracisternal to i.v. and i.p. to i.v. administration of rHu-IL-1 alpha were about 38 and 0.1, respectively. The activity of rHu-IL-1 alpha and rHu-TNF, unlike mIFN alpha, was not naloxone-reversible. rHu-IL-1 alpha did not produce an increase in writhes counts even if injected directly into the peritoneal cavity. These results suggest that rHu-IL-1 alpha, as well as lipopolysaccharide, rHu-TNF and mIFN alpha, had potent anti-writhing activity when given i.v. and its action is due to a central mechanism but is not naloxone-reversible, and that rHu-IL-1 alpha is not algesic under the experimental conditions used.
authors.affiliation: Department of Pharmacology, Dainippon Pharmaceutical Co., Ltd., Osaka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
authors.forename: K
authors.initials: K
authors.lastname: Nakanishi
authors.forename: A
authors.initials: A
authors.lastname: Kita
authors.forename: T
authors.initials: T
authors.lastname: Kadokawa
mesh_terms: D000700:Analgesics; D000818:Animals; D016227:Benzoquinones; D001921:Brain / Q000187:drug effects* / Q000502:physiology; D005260:Female; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000494:pharmacology*; D008070:Lipopolysaccharides / Q000494:pharmacology; D051379:Mice; D008815:Mice, Inbred Strains; D009270:Naloxone / Q000494:pharmacology; D011809:Quinones; D011994:Recombinant Proteins / Q000494:pharmacology
chemical_list: D000700:Analgesics; D016227:Benzoquinones; D007375:Interleukin-1; D008070:Lipopolysaccharides; D011809:Quinones; D011994:Recombinant Proteins; C029322:phenylbenzoquinone; D009270:Naloxone