Vasopressin content in select brain regions during extinction of a conditioned taste aversion

Elizabeth A. Brownson, Roberta D. Brinton, Kathleen C. Chambers

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Previous studies have shown that low levels of vasopressin during extinction of conditioned taste avoidance are associated with a faster extinction, that fluid deprivation differentially alters vasopressin levels in various neural areas, and that extinction of conditioned taste avoidance is accelerated in fluid deprived male rats. The following study was designed to identify areas of the brain in which vasopressin levels are different in fluid deprived and nondeprived males during extinction of conditioned taste avoidance. Arginine vasopressin content was determined by radioimmunoassay in the paraventricular nucleus (PVN), medial amygdala (AMe), bed nucleus of the stria terminalis (BNST), nucleus tractus solitarius (NTS), medial septum (MS), lateral septum (LS), and insular cortex (IC) of unconditioned nondeprived males and conditioned males that were maintained on a 23-h fluid deprivation schedule or that were nondeprived. Vasopressin content in the PVN of deprived and nondeprived males differed during extinction. Based on comparisons with unconditioned nondeprived males, this difference was due to an elevation in the vasopressin content of the nondeprived but not the deprived males. These results raise the possibility that a vasopressinergic system in the PVN plays a critical role in the differential extinction rate of fluid deprived and nondeprived males, which will need to be verified by manipulating vasopressin levels in this brain site during extinction of a conditioned taste avoidance.

Original languageEnglish (US)
Pages (from-to)125-134
Number of pages10
JournalBrain Research Bulletin
Volume59
Issue number2
DOIs
StatePublished - Oct 30 2002
Externally publishedYes

Keywords

  • Brain vasopressin content
  • Conditioned taste avoidance
  • Extinction
  • Fluid deprivation

ASJC Scopus subject areas

  • Neuroscience(all)

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