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Home > Methylation of OPRL1 mediates the effect of psychosocial stress on binge drinking in adolescents.

Ruggeri, Barbara and Macare, Christine and Stopponi, Serena and Jia, Tianye and Carvalho, Fabiana M and Robert, Gabriel and Banaschewski, Tobias and Bokde, Arun L W and Bromberg, Uli and Büchel, Christian and Cattrell, Anna and Conrod, Patricia J and Desrivières, Sylvane and Flor, Herta and Frouin, Vincent and Gallinat, Jürgen and Garavan, Hugh and Gowland, Penny and Heinz, Andreas and Ittermann, Bernd and Martinot, Jean Luc and Martinot, Marie-Laure Paillère and Nees, Frauke and Papadopoulos-Orfanos, Dimitri and Paus, Tomáš and Poustka, Luise and Smolka, Michael N and Vetter, Nora C and Walter, Henrik and Whelan, Robert and Sommer, Wolfgang H and Bakalkin, Georgy and Ciccocioppo, Roberto and Schumann, Gunter (2018) Methylation of OPRL1 mediates the effect of psychosocial stress on binge drinking in adolescents. Journal of Child Psychology and Psychiatry, and Allied Disciplines , 59 , (6) , pp. 650-658.

URL: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC59751...

BACKGROUND: Nociceptin is a key regulator linking environmental stress and alcohol drinking. In a genome-wide methylation analysis, we recently identified an association of a methylated region in the OPRL1 gene with alcohol-use disorders.

METHODS: Here, we investigate the biological basis of this observation by analysing psychosocial stressors, methylation of the OPRL1 gene, brain response during reward anticipation and alcohol drinking in 660 fourteen-year-old adolescents of the IMAGEN study. We validate our findings in marchigian sardinian (msP) alcohol-preferring rats that are genetically selected for increased alcohol drinking and stress sensitivity.

RESULTS: We found that low methylation levels in intron 1 of OPRL1 are associated with higher psychosocial stress and higher frequency of binge drinking, an effect mediated by OPRL1 methylation. In individuals with low methylation of OPRL1, frequency of binge drinking is associated with stronger BOLD response in the ventral striatum during reward anticipation. In msP rats, we found that stress results in increased alcohol intake and decreased methylation of OPRL1 in the nucleus accumbens.

CONCLUSIONS: Our findings describe an epigenetic mechanism that helps to explain how psychosocial stress influences risky alcohol consumption and reward processing, thus contributing to the elucidation of biological mechanisms underlying risk for substance abuse.


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