DNA Methylation in the Medial Prefrontal Cortex Regulates Alcohol-Induced Behavior and Plasticity

被引:83
作者
Barbier, Estelle [1 ]
Tapocik, Jenica D. [2 ]
Juergens, Nathan [2 ]
Pitcairn, Caleb [2 ]
Borich, Abbey [2 ]
Schank, Jesse R. [2 ]
Sun, Hui [2 ]
Schuebel, Kornel [3 ]
Zhou, Zhifeng [3 ]
Yuan, Qiaoping [3 ]
Vendruscolo, Leandro F. [4 ]
Goldman, David [3 ]
Heilig, Markus [1 ,2 ]
机构
[1] Linkoping Univ, Fac Hlth Sci, Div Cell Biol, Dept Clin & Expt Med, SE-58185 Linkoping, Sweden
[2] NIAAA, Lab Clin & Translat Studies, Bethesda, MD 20892 USA
[3] NIAAA, Lab Neurogenet, NIH, Bethesda, MD 20892 USA
[4] NIDA, Integrat Neurosci Res Branch, NIH, Baltimore, MD 21224 USA
关键词
alcoholism; DNA methylation; DNMT; epigenetics; neurotransmitter release; plasticity; EXPRESSION ANALYSIS; ETHANOL; BRAIN; ACTIVATION; INHIBITORS; ADDICTION; DRINKING; NEURONS; TOPHAT;
D O I
10.1523/JNEUROSCI.4571-14.2015
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Recent studies have suggested an association between alcoholism and DNA methylation, a mechanism that can mediate long-lasting changes in gene transcription. Here, we examined the contribution of DNA methylation to the long-term behavioral and molecular changes induced by a history of alcohol dependence. In search of mechanisms underlying persistent rather than acute dependence-induced neuroadaptations, we studied the role of DNA methylation regulating medial prefrontal cortex (mPFC) gene expression and alcohol-related behaviors in rats 3 weeks into abstinence following alcohol dependence. Postdependent rats showed escalated alcohol intake, which was associated with increased DNA methylation as well as decreased expression of genes encoding synaptic proteins involved in neurotransmitter release in the mPFC. Infusion of the DNA methyltransferase inhibitor RG108 prevented both escalation of alcohol consumption and dependence-induced downregulation of 4 of the 7 transcripts modified in postdependent rats. Specifically, RG108 treatment directly reversed both downregulation of synaptotagmin 2 (Syt2) gene expression and hypermethylation on CpG#5 of its first exon. Lentiviral inhibition of Syt2 expression in the mPFC increased aversion-resistant alcohol drinking, supporting a mechanistic role of Syt2 in compulsive-like behavior. Our findings identified a functional role of DNA methylation in alcohol dependence-like behavioral phenotypes and a candidate gene network that may mediate its effects. Together, these data provide novel evidence for DNA methyltransferases as potential therapeutic targets in alcoholism.
引用
收藏
页码:6153 / 6164
页数:12
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