Intracranial Self-Administration of Ethanol within the Ventral Tegmental Area of Male Wistar Rats

Evidence for Involvement of Dopamine Neurons

Zachary Rodd, Roberto I. Melendez, Richard Bell, Kelly A. Kuc, Ying Zhang, James M. Murphy, William J. McBride

Research output: Contribution to journalArticle

141 Citations (Scopus)

Abstract

Previous work from our laboratory indicated that female Wistar rats will self-administer ethanol (EtOH) directly into the posterior ventral tegmental area (VTA). These results suggested that VTA dopamine (DA) neurons might be involved in mediating the reinforcing actions of EtOH within this region. The objectives of this study were to determine (1) the dose-response effects for the self-administration of EtOH into the VTA of male Wistar rats, and (2) the involvement of VTA DA neurons in the reinforcing actions of EtOH within the VTA. Adult male Wistar rats were implanted stereotaxically with guide cannulas aimed at the posterior or anterior VTA. After 1 week, rats were placed in standard two-lever (active and inactive) experimental chambers for a total of seven to eight sessions. The first experiment determined the intracranial self-administration of EtOH (0-400 mg%) into the posterior and anterior VTA. The second experiment examined the effects of coadministration of the D 2/3 agonist quinpirole on the acquisition and maintenance of EtOH self-infusions into the posterior VTA. The final experiment determined the effects of a D2 antagonist (sulpiride) to reinstate self-administration behavior in rats given EtOH and quinpirole to coadminister. Male Wistar rats self-infused 100-300 mg% EtOH directly into the posterior, but not anterior, VTA. Coadministration of quinpirole prevented the acquisition and extinguished the maintenance of EtOH self-infusion into the posterior VTA, and addition of sulpiride reinstated EtOH self-administration. The results of this study indicate that EtOH is reinforcing within the posterior VTA of male Wistar rats and suggest that activation of VTA DA neurons is involved in this process.

Original languageEnglish
Pages (from-to)1050-1057
Number of pages8
JournalJournal of Neuroscience
Volume24
Issue number5
DOIs
StatePublished - Feb 4 2004

Fingerprint

Ventral Tegmental Area
Self Administration
Dopaminergic Neurons
Wistar Rats
Ethanol
Quinpirole
Sulpiride
Maintenance

Keywords

  • Dopamine
  • Ethanol reinforcement
  • Intracranial self-administration
  • Quinpirole
  • Sulpiride
  • Ventral tegmental area

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Intracranial Self-Administration of Ethanol within the Ventral Tegmental Area of Male Wistar Rats : Evidence for Involvement of Dopamine Neurons. / Rodd, Zachary; Melendez, Roberto I.; Bell, Richard; Kuc, Kelly A.; Zhang, Ying; Murphy, James M.; McBride, William J.

In: Journal of Neuroscience, Vol. 24, No. 5, 04.02.2004, p. 1050-1057.

Research output: Contribution to journalArticle

Rodd, Zachary ; Melendez, Roberto I. ; Bell, Richard ; Kuc, Kelly A. ; Zhang, Ying ; Murphy, James M. ; McBride, William J. / Intracranial Self-Administration of Ethanol within the Ventral Tegmental Area of Male Wistar Rats : Evidence for Involvement of Dopamine Neurons. In: Journal of Neuroscience. 2004 ; Vol. 24, No. 5. pp. 1050-1057.
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abstract = "Previous work from our laboratory indicated that female Wistar rats will self-administer ethanol (EtOH) directly into the posterior ventral tegmental area (VTA). These results suggested that VTA dopamine (DA) neurons might be involved in mediating the reinforcing actions of EtOH within this region. The objectives of this study were to determine (1) the dose-response effects for the self-administration of EtOH into the VTA of male Wistar rats, and (2) the involvement of VTA DA neurons in the reinforcing actions of EtOH within the VTA. Adult male Wistar rats were implanted stereotaxically with guide cannulas aimed at the posterior or anterior VTA. After 1 week, rats were placed in standard two-lever (active and inactive) experimental chambers for a total of seven to eight sessions. The first experiment determined the intracranial self-administration of EtOH (0-400 mg{\%}) into the posterior and anterior VTA. The second experiment examined the effects of coadministration of the D 2/3 agonist quinpirole on the acquisition and maintenance of EtOH self-infusions into the posterior VTA. The final experiment determined the effects of a D2 antagonist (sulpiride) to reinstate self-administration behavior in rats given EtOH and quinpirole to coadminister. Male Wistar rats self-infused 100-300 mg{\%} EtOH directly into the posterior, but not anterior, VTA. Coadministration of quinpirole prevented the acquisition and extinguished the maintenance of EtOH self-infusion into the posterior VTA, and addition of sulpiride reinstated EtOH self-administration. The results of this study indicate that EtOH is reinforcing within the posterior VTA of male Wistar rats and suggest that activation of VTA DA neurons is involved in this process.",
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