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Related Experiment Videos

Decrease in basal dopamine levels in the nucleus accumbens shell during daily drug-seeking behaviour in rats.

M A F M Gerrits1, P Petromilli, H G M Westenberg

  • 1Department of Medical Pharmacology, Rudolf Magnus Institute for Neurosciences, UMC Utrecht, Utrecht, The Netherlands. gerrits@med.uu.nl

Brain Research
|December 26, 2001
PubMed
Summary

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Accumbal dopamine (DA) levels change during drug seeking. Heroin and cocaine self-administration initially increase DA, but repeated use leads to lower basal DA, suggesting its role in drug motivation.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Addiction Research

Background:

  • Accumbal dopamine (DA) is implicated in drug dependence and drug-seeking behaviors.
  • Understanding the dynamics of DA in the nucleus accumbens (NAc) shell is crucial for addiction research.

Purpose of the Study:

  • To investigate the role of accumbal DA in drug-seeking behavior during daily self-administration of heroin and cocaine.
  • To examine changes in extracellular DA concentrations in the NAc shell during acute and repeated drug intake.

Main Methods:

  • Rats underwent daily intravenous self-administration of heroin or cocaine for five consecutive sessions.
  • Extracellular DA concentrations in the NAc shell were measured before and after acute (1 session) and repeated (5 sessions) self-administration.
  • Basal DA levels were monitored before scheduled self-administration sessions.

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Main Results:

  • Acute and repeated heroin/cocaine self-administration increased extracellular DA in the NAc shell two- to threefold.
  • Basal DA levels in the NAc shell were halved before the 5th self-administration session compared to drug-naive animals.
  • These findings suggest DA changes reflect direct drug effects and involvement in drug-seeking motivation.

Conclusions:

  • Initiation of intravenous heroin and cocaine self-administration is associated with altered extracellular DA levels in the NAc shell.
  • Accumbal DA appears to be involved in the motivational aspects of daily drug-seeking behavior.
  • Neuroadaptive changes in the mesolimbic DA system from repeated drug use result in a tonic decrease in overall NAc DA activity.