Regulation of ethanol intake under chronic mild stress

Roles of dopamine receptors and transporters

Foteini Delis, Christina Rombola, Robert Bellezza, Lauren Rosko, David Grandy, Nora D. Volkow, Panayotis K. Thanos

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Studies have shown that exposure to chronic mild stress decreases ethanol intake and preference in dopamine D2 receptor wild-type mice (Drd2+/+), while it increases intake in heterozygous (Drd2+/-) and knockout (Drd2-/-) mice. Dopaminergic neurotransmission in the basal forebrain plays a major role in the reinforcing actions of ethanol as well as in brain responses to stress. In order to identify neurochemical changes associated with the regulation of ethanol intake, we used in vitro receptor autoradiography to measure the levels and distribution of dopamine D1 and D2 receptors and dopamine transporters (DAT). Receptor levels were measured in the basal forebrain of Drd2+/+, Drd2+/-, and Drd2-/-mice belonging to one of four groups: control (C), ethanol intake (E), chronic mild stress exposure (S), and ethanol intake under chronic mild stress (ES). D2 receptor levels were higher in the lateral and medial striatum of Drd2+/+ ES mice, compared with Drd2+/+ E mice. Ethanol intake in Drd2+/+ mice was negatively correlated with striatal D2 receptor levels. D2 receptor levels in Drd2+/-mice were the same among the four treatment groups. DAT levels were lower in Drd2+/-C and Drd2-/-C mice, compared with Drd2+/+ C mice. Among Drd2+/-mice, S and ES groups had higher DAT levels compared with C and E groups in most regions examined. In Drd2-/-mice, ethanol intake was positively correlated with DAT levels in all regions studied. D1 receptor levels were lower in Drd2+/-and Drd2-/-mice, compared with Drd2+/+, in all regions examined and remained unaffected by all treatments. The results suggest that in normal mice, ethanol intake is associated with D2 receptor-mediated neurotransmission, which exerts a protective effect against ethanol overconsumption under stress. In mice with low Drd2 expression, where DRD2 levels are not further modulated, ethanol intake is associated with DAT function which is upregulated under stress leading to ethanol overconsumption.

    Original languageEnglish (US)
    Article number118
    JournalFrontiers in Behavioral Neuroscience
    Volume9
    Issue numberMAY
    DOIs
    StatePublished - May 12 2015

    Fingerprint

    Dopamine Plasma Membrane Transport Proteins
    Dopamine Receptors
    Ethanol
    Synaptic Transmission
    Corpus Striatum
    Dopamine D1 Receptors
    Dopamine D2 Receptors
    Autoradiography
    Knockout Mice

    Keywords

    • Chronic mild stress
    • D1 receptor
    • D2 receptor
    • Dopamine transporter
    • Ethanol

    ASJC Scopus subject areas

    • Behavioral Neuroscience
    • Cognitive Neuroscience
    • Neuropsychology and Physiological Psychology

    Cite this

    Delis, F., Rombola, C., Bellezza, R., Rosko, L., Grandy, D., Volkow, N. D., & Thanos, P. K. (2015). Regulation of ethanol intake under chronic mild stress: Roles of dopamine receptors and transporters. Frontiers in Behavioral Neuroscience, 9(MAY), [118]. https://doi.org/10.3389/fnbeh.2015.00118

    Regulation of ethanol intake under chronic mild stress : Roles of dopamine receptors and transporters. / Delis, Foteini; Rombola, Christina; Bellezza, Robert; Rosko, Lauren; Grandy, David; Volkow, Nora D.; Thanos, Panayotis K.

    In: Frontiers in Behavioral Neuroscience, Vol. 9, No. MAY, 118, 12.05.2015.

    Research output: Contribution to journalArticle

    Delis, Foteini ; Rombola, Christina ; Bellezza, Robert ; Rosko, Lauren ; Grandy, David ; Volkow, Nora D. ; Thanos, Panayotis K. / Regulation of ethanol intake under chronic mild stress : Roles of dopamine receptors and transporters. In: Frontiers in Behavioral Neuroscience. 2015 ; Vol. 9, No. MAY.
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