Voluntary ethanol intake predicts κ-opioid receptor supersensitivity and regionally distinct dopaminergic adaptations in macaques

Cody A. Siciliano, Erin S. Calipari, Verginia Cuzon Carlson, Christa Helms, David M. Lovinger, Kathleen (Kathy) Grant, Sara R. Jones

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    The dopaminergic projections from the ventral midbrain to the striatum have long been implicated in mediating motivated behaviors and addiction. Previously it was demonstrated that κ-opioid receptor (KOR) signaling in the striatum plays a critical role in the increased reinforcing efficacy of ethanol following ethanol vapor exposure in rodent models. Although rodents have been used extensively to determine the neurochemical consequences of chronic ethanol exposure, establishing high levels of voluntary drinking in these models has proven difficult. Conversely, nonhuman primates exhibit similar intake and pattern to humans in regard to drinking. Here we examine the effects of chronic voluntary ethanol self-administration on dopamine neurotransmission and the ability of KORs to regulate dopamine release in the dorsolateral caudate (DLC) and nucleus accumbens (NAc) core. Using voltammetry in brain slices from cynomolgus macaques after 6 months of ad libitum ethanol drinking, we found increased KOR sensitivity in both the DLC and NAc. The magnitude of ethanol intake predicted increases in KOR sensitivity in the NAc core, but not the DLC. Additionally, ethanol drinking increased dopamine release and uptake in the NAc, but decreased both of these measures in the DLC. These data suggest that chronic daily drinking may result in regionally distinct disruptions of striatal outputs. In concert with previous reports showing increased KOR regulation of drinking behaviors induced by ethanol exposure, the strong relationship between KOR activity and voluntary ethanol intake observed here gives further support to the hypothesis that KORs may provide a promising pharmacotherapeutic target in the treatment of alcoholism.

    Original languageEnglish (US)
    Pages (from-to)5959-5968
    Number of pages10
    JournalJournal of Neuroscience
    Volume35
    Issue number15
    DOIs
    StatePublished - Apr 15 2015

    Fingerprint

    Macaca
    Opioid Receptors
    Ethanol
    Drinking
    Nucleus Accumbens
    Dopamine
    Caudate Nucleus
    Rodentia
    Corpus Striatum
    Drinking Behavior
    Aptitude
    Self Administration
    Mesencephalon
    Synaptic Transmission
    Primates
    Alcoholism
    Brain

    Keywords

    • Caudate
    • Dopamine
    • Nonhuman primate
    • Nucleus accumbens
    • Voltammetry
    • κ-opioid receptor

    ASJC Scopus subject areas

    • Neuroscience(all)

    Cite this

    Voluntary ethanol intake predicts κ-opioid receptor supersensitivity and regionally distinct dopaminergic adaptations in macaques. / Siciliano, Cody A.; Calipari, Erin S.; Cuzon Carlson, Verginia; Helms, Christa; Lovinger, David M.; Grant, Kathleen (Kathy); Jones, Sara R.

    In: Journal of Neuroscience, Vol. 35, No. 15, 15.04.2015, p. 5959-5968.

    Research output: Contribution to journalArticle

    Siciliano, Cody A. ; Calipari, Erin S. ; Cuzon Carlson, Verginia ; Helms, Christa ; Lovinger, David M. ; Grant, Kathleen (Kathy) ; Jones, Sara R. / Voluntary ethanol intake predicts κ-opioid receptor supersensitivity and regionally distinct dopaminergic adaptations in macaques. In: Journal of Neuroscience. 2015 ; Vol. 35, No. 15. pp. 5959-5968.
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