title: Co-treatment with MK-801 potentiates naloxone-precipitated morphine withdrawal in the isolated spinal cord of the neonatal rat.
abstract: The effects of acute and chronic administration of (MK-801: [(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclo-hepten-5,10-imine hydrogen maleate) were assessed on morphine dependence in the isolated spinal cord of the neonatal rat and on behavioral measures in intact adult rats. Neonatal rats were treated chronically (3 or 4 days) with injections of either morphine, morphine + MK-801, or saline. Naloxone (10 microM) which increased baseline ventral root spontaneous firing, induced more activity in spinal cords from morphine-treated neonates than in saline controls. In spinal cords from neonates receiving MK-801 with morphine, naloxone-induced spontaneous firing was significantly greater than in saline-treated and morphine alone-treated neonates. Acute MK-801 attenuated naloxone-induced firing in the morphine-treated group. Chronic co-treatment with MK-801 increased locomotor signs of withdrawal and decreased mastication in intact adult rats which had been treated chronically with morphine. MK-801-induced enhancement of morphine withdrawal is consistent with upregulation of NMDA receptors.
authors.affiliation: Neuroimaging and Drug Action Section, Division of Intramural Research, National Institute on Drug Abuse, Baltimore, MD 21224, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Bell
authors.forename: C L
authors.initials: CL
authors.lastname: Beglan
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001522:Behavior, Animal / Q000187:drug effects; D016291:Dizocilpine Maleate / Q000494:pharmacology*; D004357:Drug Synergism; D004594:Electrophysiology; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D009020:Morphine / Q000009:adverse effects*; D009021:Morphine Dependence / Q000517:prevention & control; D009270:Naloxone / Q000494:pharmacology*; D009292:Narcotic Antagonists / Q000494:pharmacology*; D009294:Narcotics / Q000009:adverse effects*; D051381:Rats; D011916:Rats, Inbred F344; D017207:Rats, Sprague-Dawley; D013116:Spinal Cord / Q000187:drug effects / Q000503:physiopathology*; D013375:Substance Withdrawal Syndrome / Q000503:physiopathology*
chemical_list: D018691:Excitatory Amino Acid Antagonists; D009292:Narcotic Antagonists; D009294:Narcotics; D009270:Naloxone; D016291:Dizocilpine Maleate; D009020:Morphine