Potentiation of the effects of reward-related stimuli by dopaminergic-dependent mechanisms in the nucleus accumbens

Psychopharmacology (Berl). 1991;104(3):377-85. doi: 10.1007/BF02246039.

Abstract

Three experiments examined the behavioural, pharmacological and neural specificity of the previously reported potentiation of responding with conditioned reinforcement following intra-accumbens d-amphetamine, by studying the effects of intra-accumbens dopamine (DA) and noradrenaline, using an acquisition of a new response procedure. In experiment 1, the effects of intra-cerebral DA infusions (5, 20, 50 micrograms/2 microliters) were compared in four conditions: (i) intra-accumbens DA following positive pairing of the conditioned stimulus (CS) and water during training; (ii) as (i) but also following a systemic dose of the DA receptor antagonist alpha-flupenthixol; (iii) intra-accumbens DA following random pairing of the CS and water during training; and (iv) as (i) but with intra-caudate rather than intra-accumbens DA. The results showed that only with intra-accumbens DA in the positive pairing condition was there a significant dose-dependent increase in responding. In experiment 2, the effects of a higher range of doses (20, 100, 200 micrograms) and smaller infusion volume (5, 25, 50 micrograms/l microliters) of intra-accumbens DA were studied, in comparison with a similar range of doses (5, 25, 50 micrograms/l microliters) of intra-accumbens noradrenaline (NA). Only DA produced a selective, dose-dependent increase in responding with conditioned reinforcement. In experiment 3 neurotoxic lesions of the dorsal noradrenergic bundle (DNAB) using 6-hydroxydopamine producing profound (about 90%) depletion of cortical and nucleus accumbens NA levels had no effect on the increased responding with conditioned reinforcement produced by intra-accumbens d-amphetamine (3, 10, 30 micrograms/l microliters).(ABSTRACT TRUNCATED AT 250 WORDS)

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain Chemistry / drug effects
  • Caudate Nucleus / drug effects
  • Caudate Nucleus / metabolism
  • Conditioning, Operant / drug effects*
  • Corpus Striatum / drug effects
  • Corpus Striatum / metabolism
  • Dextroamphetamine / pharmacology
  • Dopamine / administration & dosage
  • Dopamine / metabolism
  • Dopamine / pharmacology
  • Dopamine / physiology*
  • Dose-Response Relationship, Drug
  • Injections, Intraventricular
  • Male
  • Norepinephrine / metabolism
  • Nucleus Accumbens / drug effects
  • Nucleus Accumbens / physiology*
  • Oxidopamine / pharmacology
  • Rats
  • Rats, Inbred Strains
  • Reward*

Substances

  • Oxidopamine
  • Dextroamphetamine
  • Dopamine
  • Norepinephrine