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• W2078491507 abstract "The endocannabinoid system is a neuromodulatory system which controls the release of multiple neurotransmitters, including glutamate and both, the endocannabinoid and glutamatergic systems, have been implicated in alcohol relapse. Cannabinoid agonists induce an increase in relapse-like drinking whereas glutamate receptor antagonists could prevent it. Here we hypothesize that cannabinoid-induced increases in relapse-like alcohol drinking could be mediated by glutamatergic N-methyl-d-aspartate (NMDA) receptors. To test this hypothesis, Wistar rats with a background of alcohol operant self-administration were treated with the cannabinoid receptor agonist (R)-(+)-[2,3-dihydro-5-methyl-3-(4-morpholinylmethyl), pyrrolo [1,2,3-de]-1,4-benzoxazin-6-yl]-1-naphthalenylmethanone mesylate (WIN 55.212-2, WIN) (2.0 mg/kg) during periods of alcohol deprivation. For five consecutive days, 30 min before the reintroduction of alcohol, rats were injected with the NMDA/glycine receptor antagonist 7-chloro-4-hydroxy-3-(3-phenoxy)phenylquinolin-2-[1H]-one (L-701) (1.25–5.0 mg/kg) and alcohol reinforcement was evaluated. Our results clearly show that L-701 prevented the cannabinoid-induced increase in relapse-like drinking in a dose-dependent manner, whereas L-701 alone, in the absence of WIN treatment, did not significantly alter alcohol intake. The potentiation of relapse-like drinking induced by WIN is not caused by nonspecific anxiogenic effects, since no effect was observed in the elevated-plus maze test. These alcohol-related behaviors are linked to differential changes in CNR1 and NR1 subunit mRNA transcripts. In WIN-treated rats, an increase in CNR1 transcript levels was observed in the hypothalamus and striatum, whereas in the amygdala and anterior cingulate cortex, brain regions involved in emotional processing, a decrease was observed. Interestingly, such changes were blocked after L-701 treatment. Finally, WIN treatment also caused a reduction in NR1 mRNA levels in the amygdala. In conclusion, pharmacological inactivation of the glycine-binding site of NMDA receptors may control cannabinoid-induced relapse-like drinking, which is associated with altered expression of CNR1 and NR1 gene expression as observed after WIN treatment." @default.
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• W2078491507 date "2009-01-01" @default.
• W2078491507 modified "2023-10-18" @default.
• W2078491507 title "Cannabinoid-induced increase in relapse-like drinking is prevented by the blockade of the glycine-binding site of N-methyl-d-aspartate receptors" @default.
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• W2078491507 doi "https://doi.org/10.1016/j.neuroscience.2008.10.002" @default.
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