Nullifying drug-induced sensitization: Behavioral and electrophysiological evaluations of dopaminergic and serotonergic ligands in methamphetamine-sensitized rats

J. McDaid, C. E. Tedford, A. R. Mackie, J. E. Dallimore, A. L. Mickiewicz, F. Shen, J. M. Angle, T. C. Napier*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Repeated exposure to methamphetamine produces a persistent enhancement of the acute motor effects of the drug, commonly referred to as behavioral sensitization. Behavioral sensitization involves monoaminergic projections to several forebrain nuclei. We recently revealed that the ventral pallidum (VP) may also be involved. In this study, we sought to establish if treatments with antagonists or partial agonists to monoaminergic receptors could "reverse" methamphetamine-induced behavioral and VP neuronal sensitization. Behavioral sensitization was obtained in rats with five once-daily s.c. injections of 2.5 mg/kg methamphetamine, an effect that persisted for at least 60 days. After the development of sensitization, 15 once-daily treatments of mirtazapine (a 5-HT2/3, α2 and H1 antagonist), SKF38393 (D1 partial agonist) or SCH23390 (dopamine D1 antagonist) nullified indices of motor sensitization as assessed by measuring the motoric response to an acute methamphetamine challenge 30 days after the fifth repeated methamphetamine treatment. VP neurons recorded in vivo from methamphetamine-sensitized rats at the 30-day withdrawal time also showed a robust downward shift in the excitatory responses observed to an acute i.v. methamphetamine challenge in non-sensitized rats. This decreased excitatory effect was reversed by mirtazapine, but not by other antagonists that were tested. These data suggest a potential therapeutic benefit for mirtazapine in the treatment of methamphetamine addiction, and point to a possible role for the VP in the sensitization process to methamphetamine.

Original languageEnglish (US)
Pages (from-to)55-66
Number of pages12
JournalDrug and Alcohol Dependence
Volume86
Issue number1
DOIs
StatePublished - Jan 5 2007

Keywords

  • α Adrenergic receptors
  • 5-HT receptors
  • D dopamine receptors
  • Methamphetamine
  • Mirtazapine
  • Ventral pallidum

ASJC Scopus subject areas

  • Medicine(all)
  • Behavioral Neuroscience
  • Toxicology
  • Health(social science)

Fingerprint Dive into the research topics of 'Nullifying drug-induced sensitization: Behavioral and electrophysiological evaluations of dopaminergic and serotonergic ligands in methamphetamine-sensitized rats'. Together they form a unique fingerprint.

Cite this