title: ICI 154,129, a delta-opioid receptor antagonist raises seizure threshold in rats.
abstract: Acute i.c.v. administration of ICI 154,129 (100-600 micrograms), a delta-opioid receptor antagonist, raised the seizure threshold in a dose-related manner in rats exposed to flurothyl, a volatile convulsant. Pretreatment with naloxone or beta-funaltrexamine (beta-FNA) antagonized this effect. Lower doses of ICI 154,129 (12.5-50 micrograms), which did not influence seizure threshold, selectively antagonized the anticonvulsant action of [D-Ala2,D-Leu5]enkephalin (DADLE) in the same procedure. Consequently, it may be inferred that ICI 154,129 at high doses has mu-agonist and at low doses delta-antagonist properties in the rat flurothyl test.
mesh_terms: D000818:Animals; D004743:Enkephalin, Leucine / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors / Q000494:pharmacology; D016308:Enkephalin, Leucine-2-Alanine; D008297:Male; D009270:Naloxone / Q000494:pharmacology; D009271:Naltrexone / Q000031:analogs & derivatives / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011957:Receptors, Opioid / Q000187:drug effects*; D012640:Seizures / Q000188:drug therapy*
chemical_list: D009292:Narcotic Antagonists; D011957:Receptors, Opioid; D009270:Naloxone; D004743:Enkephalin, Leucine; D009271:Naltrexone; D016308:Enkephalin, Leucine-2-Alanine; C024524:beta-funaltrexamine; C036405:ICI 154129