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1 Department of Pharmacology, University of Minnesota Health Sciences Center, Medical School, Minneapolis, Minnesota
Mice were made physically dependent by implantation with morphine pellets and then pretreated with various agents which are known to alter brain catecholamine levels before the stereotyped jumping was induced by naloxone. Disulfiram pretreatment decreased central norepinephnine (NE) levels by 46% and inhibited naloxone-induced jumping by 49%.
-Methyltyrosine (
-MT) pretreatment decreased NE by 73% and dopamine by 81% and inhibited the number of jumps by 89%. Pretreatment with 3-(3,4-dihydroxyphenyl)-L-alanine in addition to
-MT restored the dopamine concentration and the numbers of jumps were increased 4-fold over those of mice pretreated with
-MT alone. Pretreatment with threo-dihydroxyphenylserine in addition to
-MT restored the NE concentration but the jumping was still inhibited by 90%. The full expression of abstinence syndrome in morphine-dependent mice appears to require the integrity of the central stores of NE and dopamine, especially the latter amine.
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