title: Effect of morphine, ACTH, epinephrine, Met-, Leu- and des-Tyr-Met-enkephalin on beta-endorphin-like immunoreactivity of rat brain.
abstract: Morphine (1,0 mg/kg), ACTH1-24 (10.0 micrograms/kg), epinephrine (12.0 micrograms/kg), Met-enkephalin (2.0 and 5.0 micrograms/kg), Leu-enkephalin (2.0 micrograms/kg) and des-Tyr-Met-enkephalin (2.0 micrograms/kg) all produced marked reductions of beta-endorphin-like immunoreactivity in the rat diencephalon. At a dose of 0.4 mg/kg, naloxone had no effect of its own and was unable to reverse the depleting effect of the other substances. The depletion of beta-endorphin-like immunoreactivity caused by the various treatments is attributable to release and subsequent degradation of beta-endorphin and/or of its precursors. The various behavioral effects of morphine, ACTH, epinephrine and the enkephalins may be explained by the release of endogenous beta-endorphin.
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000494:pharmacology*; D000818:Animals; D001923:Brain Chemistry / Q000187:drug effects*; D004723:Endorphins / Q000032:analysis*; D004743:Enkephalin, Leucine / Q000494:pharmacology; D004744:Enkephalin, Methionine / Q000031:analogs & derivatives / Q000494:pharmacology; D004745:Enkephalins / Q000494:pharmacology*; D004837:Epinephrine / Q000494:pharmacology*; D005260:Female; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D004745:Enkephalins; D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine; D001615:beta-Endorphin; C029668:enkephalin-Met, des-Tyr(1)-; D009020:Morphine; D000324:Adrenocorticotropic Hormone; D004837:Epinephrine