Orexin-1 receptor signalling in the prelimbic cortex and ventral tegmental area regulates cue-induced reinstatement of ethanol-seeking in IP rats

Robyn Mary Brown, Andrezza K. Kim, Shaun Yon Seng Khoo, Jee Hyun Kim, Bianca Jupp, Andrew John Lawrence

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33 Citations (Scopus)

Abstract

Orexins (hypocretins) are hypothalamic neuropeptides that innervate the entire neuraxis, including the prelimbic cortex and ventral tegmental area and have been implicated in ethanol-seeking behaviour. The present study aimed to use the orexin-1 (OX1) receptor antagonist SB-334867 to examine the role of prelimbic cortex and ventral tegmental area OX1 receptors in cue-induced reinstatement of ethanol-seeking. Ethanol-preferring rats (iP) rats were trained to self-administer ethanol (10 percent v/v, FR3) or sucrose (0.2-1 percent w/v, FR3) in the presence of reward-associated cues before being implanted with indwelling guide cannulae. Rats then underwent extinction training for 11 days. On test days, rats were given a microinjection of vehicle or SB-334867 (3 μg/side) and presented with reward-associated cues to precipitate reinstatement. Results show SB-334867 infused into the prelimbic cortex attenuated cue-induced reinstatement of ethanol-seeking, but not sucrose-seeking. OX1 antagonism in the ventral tegmental area also attenuated cue-induced reinstatement of ethanol-seeking. These findings suggest that OX1 receptors located in the prelimbic cortex and ventral tegmental area are part of a circuit driving cue-mediated ethanol-seeking behaviour.

Original languageEnglish
Pages (from-to)603-612
Number of pages10
JournalAddiction Biology
Volume21
Issue number3
DOIs
Publication statusPublished - 1 May 2016
Externally publishedYes

Keywords

  • Cue-induced reinstatement
  • ethanol
  • orexin
  • prelimbic cortex
  • SB-334867
  • ventral tegmental area

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