Acute amphetamine exposure selectively desensitizes κ-opioid receptors in the nucleus accumbens

Yan Fang Xia, Li He, Jennifer Whistler, Gregory O. Hjelmstad

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

In the present study, we investigated the effects of psychostimulant exposure on κ-opioid peptide (KOP) receptor signaling in the rat mesolimbic system. A single subcutaneous (s.c.) injection of amphetamine (2.5 mg/kg) reduced the KOP receptor-mediated inhibition of glutamate release in the nucleus accumbens shell, as a consequence of KOP receptor desensitization. This effect was blocked by dopamine (DA) receptor antagonists or the nonselective opioid antagonist, naltrexone (1 mg/kg, s.c.), and mimicked by the KOP receptor agonists U69593 (0.32 mg/kg, s.c.) and dynorphin (1 μM), indicating that an amphetamine-induced release of dynorphin is producing a long-lasting desensitization of the KOP receptor. Despite the fact that amphetamine also increases dynorphin release in the ventral tegmental area (VTA), KOP receptor function in this region was not affected by amphetamine; there was no difference in the KOP receptor-mediated change in firing rate or resting membrane potential measured in VTA neurons from saline- or amphetamine-treated animals. This study demonstrates that amphetamine can produce regionally selective adaptations in KOP receptor signaling, which may, in turn, alter the effects of subsequent drug exposure.

Original languageEnglish (US)
Pages (from-to)892-900
Number of pages9
JournalNeuropsychopharmacology
Volume33
Issue number4
DOIs
StatePublished - Mar 1 2008
Externally publishedYes

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Keywords

  • κ-opioid
  • Addiction
  • Amphetamine
  • Desensitization
  • Nucleus accumbens
  • Ventral tegmental area

ASJC Scopus subject areas

  • Pharmacology
  • Psychiatry and Mental health

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