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• W1934476054 endingPage "8058" @default.
• W1934476054 startingPage "8042" @default.
• W1934476054 abstract "One of the major challenges of cocaine addiction is the high rate of relapse to drug use after periods of withdrawal. During the first few weeks of withdrawal, cue-induced cocaine craving intensifies, or incubates, and persists over extended periods of time. Although several brain regions and molecular mechanisms were found to be involved in this process, the underlying epigenetic mechanisms are still unknown. Herein, we used a rat model of incubation of cocaine craving, in which rats were trained to self-administer cocaine (0.75 mg/kg, 6 h/d, 10 d), and cue-induced cocaine-seeking was examined in an extinction test after 1 or 30 d of withdrawal. We show that the withdrawal periods, as well as cue-induced cocaine seeking, are associated with broad, time-dependent enhancement of DNA methylation alterations in the nucleus accumbens (NAc). These gene methylation alterations were partly negatively correlated with gene expression changes. Furthermore, intra-NAc injections of a DNA methyltransferase inhibitor (RG108, 100 μm) abolished cue-induced cocaine seeking on day 30, an effect that persisted 1 month, whereas the methyl donor S-adenosylmethionine (500 μm) had an opposite effect on cocaine seeking. We then targeted two proteins whose genes were demethylated by RG108-estrogen receptor 1 (ESR1) and cyclin-dependent kinase 5 (CDK5). Treatment with an intra-NAc injection of the ESR1 agonist propyl pyrazole triol (10 nm) or the CDK5 inhibitor roscovitine (28 μm) on day 30 of withdrawal significantly decreased cue-induced cocaine seeking. These results demonstrate a role for NAc DNA methylation, and downstream targets of DNA demethylation, in incubation of cocaine craving." @default.
• W1934476054 created "2016-06-24" @default.
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• W1934476054 date "2015-05-27" @default.
• W1934476054 modified "2023-10-13" @default.
• W1934476054 title "Role of DNA Methylation in the Nucleus Accumbens in Incubation of Cocaine Craving" @default.
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• W1934476054 doi "https://doi.org/10.1523/jneurosci.3053-14.2015" @default.
• W1934476054 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6605346" @default.
• W1934476054 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26019323" @default.
• W1934476054 hasPublicationYear "2015" @default.
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