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Selective dopamine antagonists reduce nicotine self-administration.

W A Corrigall1, K M Coen

  • 1Addiction Research Foundation, Toronto, Ontario, Canada.

Psychopharmacology
|January 1, 1991
PubMed
Summary
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Dopamine antagonists SCH23390 and spiperone reduced nicotine self-administration and activity in rats. Findings suggest dopamine

Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Drug Addiction Research

Background:

  • Dopamine plays a crucial role in reward pathways and motor control.
  • Understanding dopamine's role in nicotine addiction is essential for developing effective treatments.

Purpose of the Study:

  • To investigate the effects of selective D1 and D2 dopamine antagonists on nicotine self-administration in rats.
  • To differentiate the roles of dopamine in drug reinforcement versus sensorimotor functions.

Main Methods:

  • Rats were trained to self-administer nicotine.
  • Locomotor activity and food-maintained responding were measured.
  • The effects of D1 antagonist SCH23390, D2 antagonist spiperone, and haloperidol were assessed.

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Main Results:

  • Dopamine antagonists significantly reduced nicotine self-administration and locomotor activity.
  • Response patterns suggested motor impairment was not the primary cause of reduced responding.
  • SCH23390, but not spiperone, significantly reduced locomotor activity.

Conclusions:

  • Dopamine antagonists differentially affect nicotine self-administration compared to other drugs like cocaine.
  • Dopamine's role in nicotine reinforcement is distinct from its role in sensorimotor integration.