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International audience; Addiction transfer from alcohol to sugar has been demonstrated in the alcohol postdependent state model in rats. To assess whether changes in sugar intake and craving can occur during alcohol withdrawal in humans we conducted a prospective, observational study in a university hospital addictions treatment center. Recruited patients had severe alcohol use disorder, were hospitalized for 7 days in the short-stay unit for alcohol withdrawal and then for 6 weeks in the rehabilitation unit. During the hospital stay, they had no access to alcohol but had full access to sweet products and beverages in a shop and vending machines located inside the hospital. Alcohol craving was assessed using a visual analogue scale on days 1, 15 and 45. Sugar craving, sweet products stored by patients in their rooms and weight were assessed on the same days. Thirty-five patients were included. Sugar craving increased in 14 patients during the hospital stay while no change was observed in the remaining 21. Significant increases in both the amounts of sweet products stored in the patients' rooms (p

International audience; Using the same Diagnostic and Statistical Manual of Mental Disorders, fifth version (DSM-V) criteria as in adults, borderline personality disorder (BPD) in adolescents is defined as a 1-year pattern of immature personality development with disturbances in at least five of the following domains: efforts to avoid abandonment, unstable interpersonal relationships, identity disturbance, impulsivity, suicidal and self-mutilating behaviors, affective instability, chronic feelings of emptiness, inappropriate intense anger, and stress-related paranoid ideation. BPD can be reliably diagnosed in adolescents as young as 11 years. The available epidemiological studies suggest that the prevalence of BPD in the general population of adolescents is around 3%. The clinical prevalence of BPD ranges from 11% in adolescents consulting at an outpatient clinic to 78% in suicidal adolescents attending an emergency department. The diagnostic procedure is based on a clinical assessment with respect to developmental milestones and the interpersonal context. The key diagnostic criterion is the 1-year duration of symptoms. Standardized, clinician-rated instruments are available for guiding this assessment (eg, the Diagnostic Interview for Borderlines-Revised and the Childhood Interview for DSM-IV-TR BPD). The assessment should include an evaluation of the suicidal risk. Differential diagnosis is a particular challenge, given the high frequency of mixed presentations and comorbidities. With respect to clinical and epidemiological studies, externalizing disorders in childhood constitute a risk factor for developing BPD in early adolescence, whereas adolescent depressive disorders are predictive of BPD in adulthood. The treatment of adolescents with BPD requires commitment from the parents, a cohesive medical team, and a coherent treatment schedule. With regard to evidence-based medicine, psychopharmacological treatment is not recommended and, if ultimately required, should be limited to second-generation antipsychotics. Supportive psychotherapy is the most commonly available first-line treatment. Randomized controlled trials have provided evidence in favor of the use of specific, manualized psychotherapies (dialectic-behavioral therapy, cognitive analytic therapy, and mentalization-based therapy).

International audience; BACKGROUND: Ethanol-induced behavioral sensitization (EIBS) is proposed to play a role in early and recurring steps of addiction. EIBS does not occur uniformly in all animals even from the same inbred strain. Since recent data demonstrate that epigenetic mechanisms are likely to be involved in the development and the persistence of ethanol-related behaviors, we explored the involvement of epigenetic mechanisms in ethanol response after EIBS development. METHODOLOGY: DBA/2J mice were i.p. injected with saline or ethanol (2 g/kg) once a day for 10 consecutive days. At day 17, ethanol-treated mice were split in resistant and sensitized groups. Brains were then removed 30 min after a saline or 2 g/kg ethanol challenge to assess i) gene expression using PCR array targeting 84 epigenetic-related genes and ii) histone deacetylases (HDAC), histone acetylases (HAT) and DNA methyltransferases (DNMT) activities as well as H4K12 acetylation. PRINCIPAL FINDINGS: Acute ethanol administration decreased dnmt1, esco2 and rps6ka5 genes expression. These genes were similarly altered in sensitized but not in resistant mice after an ethanol challenge, suggesting that resistant mice were tolerant to the transcriptional outcomes of an ethanol challenge. Whereas global HAT or DNMT activity was not affected, global HDAC activity was reduced after an acute ethanol injection. HDAC inhibition occurred in all ethanol-treated mice but with a lesser extent in sensitized animals. As a consequence, H4 acetylation was specifically potentiated in the core of the Nac proportionally to the striatal HDAC activity decrease. CONCLUSIONS/SIGNIFICANCE: The present study highlights that the contrasted behavioral response to an ethanol challenge between resistant and sensitized mice may be mediated by epigenetic mechanisms occurring specifically in the striatum. Here we show that vulnerability to ethanol dependence and relapse could be, at least in part, due to individual variability in acute ethanol-induced epigenetic response.

International audience; A few clinical studies have shown that dual antidepressants (serotonergic (5-HT) and noradrenergic (NE) transporter inhibitors, SNRIs) may be effective in alcoholism treatment. We studied the effect of the dual antidepressant milnacipran on ethanol operant self-administration in acutely withdrawn ethanol-dependent and in -non-dependent Wistar rats, and used fluoxetine and desipramine to dissect both 5-HT and NE components, respectively, in the effect of milnacipran. Milnacipran was also tested for relapse after protracted abstinence and on ethanol-induced (1.0 g/kg) conditioned place preference in control rats and ethanol-induced locomotor sensitization in DBA/2J female mice. Milnacipran dose dependently (5-40 mg/kg) attenuated the increased ethanol self-administration observed during early withdrawal and was more potent in preventing reinstatement in dependent rats after protracted abstinence as compared with non-dependent rats. Desipramine and fluoxetine (10 mg/kg) blocked ethanol self-administration during early withdrawal, and recovery was delayed in dependent animals, indicating a potent effect. Ethanol self-administration was also reduced 1 day after treatment with desipramine and fluoxetine but not with milnacipran. Finally, milnacipran prevented ethanol-induced place preference in ethanol-naive rats and reduced the magnitude of ethanol-induced sensitization associated with a delayed induction in mice. Desipramine (20 mg/kg) countered sensitization development and reduced its expression at 1 week after treatment; fluoxetine (10 mg/kg) reduced sensitization expression. Thus, 5-HT and NE transmissions during sensitization expression may mediate the effect of milnacipran on sensitization induction. These results support that SNRIs may have a potential use in alcoholism treatment.

International audience; Although formation and stabilization of long-lasting associative memories are thought to require time-dependent coordinated hippocampal-cortical interactions, the underlying mechanisms remain unclear. Here, we present evidence that neurons in the rat cortex must undergo a "tagging process" upon encoding to ensure the progressive hippocampal-driven rewiring of cortical networks that support remote memory storage. This process was AMPA- and N-methyl-D-aspartate receptor-dependent, information-specific, and capable of modulating remote memory persistence by affecting the temporal dynamics of hippocampal-cortical interactions. Post-learning reinforcement of the tagging process via time-limited epigenetic modifications resulted in improved remote memory retrieval. Thus, early tagging of cortical networks is a crucial neurobiological process for remote memory formation whose functional properties fit the requirements imposed by the extended time scale of systems-level memory consolidation.

Ethanol exposure during fetal life can induce irreversible cognitive deficits. These deficits have been ascribed so far to a lower NMDA-dependent synaptic long-term potentiation (LTP) in the hippocampus and whether NMDA-dependent long-term depression (LTD) may also play a critical role in those deficits remained unknown. In the present study we …

International audience; Background: Binge drinking is common in adolescents, but the impact of only a few binges on learning and memory appears underestimated. Many studies have tested the effects of long and intermittent ethanol exposure on long-term synaptic potentiation, and whether long-term synaptic depression is affected remains unknown. Methods: We studied the effects of one (3 g/kg, i.p.; blood ethanol content of 197.5 +/- 19 mg/dL) or 2 alcohol intoxications (given 9 hours apart) on adolescent rat's memory and synaptic plasticity in hippocampus slice after different delay. Results: Animals treated with 2 ethanol intoxications 48 hours before training phase in the novel object recognition task failed during test phase. As learning is related to NMDA-dependent mechanisms, we tested ketamine and found the same effect as ethanol, whereas D-serine prevented learning deficit. In hippocampus slice, NMDA-dependent long-term synaptic depression was abolished 48 hours after ethanol or ketamine but prevented after D-serine or in a low-Mg2+ recording medium. Long-term synaptic depression abolition was not observed 8 days after treatment. An i.p. treatment with MK-801, tetrahydroisoxazolopyridine, or muscimol was ineffective, and long-term synaptic potentiation, intrinsic excitability, and glutamate release remained unaffected. The input/ouput curve for NMDA-fEPSPs was shifted to the left 48 hours after the binges with a stronger contribution of GluN2B subunit, leading to a leftward shift of the Bienenstock-Cooper-Munro relationship. Interestingly, there were no cellular effects after only one ethanol injection. Conclusion: Two ethanol ``binges'' in adolescent rats are sufficient to reversibly abolish long-term synaptic depression and to evoke cognitive deficits via a short-lasting, repeated blockade of NMDA receptors only, inducing a change in the receptor subunit composition. Furthermore, ethanol effects developed over a 48-hour period of abstinence, indicating an important role of intermittence during a repeated long-duration binge behavior.

S31.1 ADOLESCENT INTERMITTENT ETHANOL-INDUCED HISTONE MODIFICATIONS AND DNA DEMETHYLATION: ROLE IN ANXIETY AND ALCOHOLISM {#article-title-2} Histone modifications and DNA methylation/demethylation regulate gene expression and play an important role in synaptic plasticity. We investigated the effects of adolescent intermittent ethanol (AIE) treatment on epigenetic modifications in the amygdala and on anxiety-like behaviors in adolescent and adult rats. The effects of AIE [2 g/kg, intraperitoneal; 2-days on/2-days off, 4 cycles (8 injections), postnatal days 28-41] on anxiety-like behaviors in adolescent rats was measured during withdrawal and effects of AIE exposure on anxiety-like and alcohol drinking behaviors at adulthood (postnatal day 92) were measured. Adolescent rats displayed anxiety-like behaviors after 24 hrs of ethanol withdrawal. At this time point, amygdaloid nuclear and cytosolic HDAC activity and levels of HDAC2 and HDAC4 were increased and histone (H3-K9) acetylation in the central (CeA) and medial amygdala (MeA) was decreased. Interestingly, in AIE adult rats nuclear HDAC activity and HDAC2 protein levels remained increased and histone acetylation remained decreased. We also found decreased histone H3 acetylation in promoters of Arc, NPY, and various BDNF exons in the amygdala of AIE compared with control (adolescent intermittent saline) adult rats. AIE produced a reduction in dendritic spines in the CeA and MeA and decreased mRNA levels of GADD45g, but not GADD45a or GADD45b in the amygdala of adult rats. AIE induced anxiety-like and alcohol drinking behaviors at adulthood were attenuated by treatment with trichostatin A. These results suggest that AIE induced epigenetic changes in the amygdala may play a crucial role in anxiety-like and alcohol-drinking behaviors at adulthood (supported by NADIA grant from NIH-NIAAA). # S31.2 IS THERE A FUTURE FOR USING HDAC INHIBITORS IN ALCOHOL DEPENDENCE? {#article-title-3} Emerging evidence suggests that epigenetic alterations to the genome, including DNA methylation and histone modifications, are important mechanisms underlying alcohol addiction. With the new field of epigenetics, there is now the opportunity to integrate the role of the epigenome not only in the short-term effects of alcohol but also in the enduring neuro-adaptations caused by chronic use of alcohol. The epigenetic modifications may be part of the neuro-adpatations occurring during the transition from the controlled intake to the loss of control and may explain how alcohol can have such a persistent effect on brain gene expression and functioning. There are now accumulating data showing that pharmacological tools targeting enzymes involved in epigenetic modifications may be useful in reducing or preventing some behavioral responses to alcohol. In the present work we have investigated the effects of different HDAC inhibitors (sodium butyrate, trichostatine A, MS-275 and sirtinol) on alcohol intake in rats with several paradigms, i.e. operant 10% ethanol self-administration, intermittent 20% ethanol intake and alcohol deprivation effect. We have also investigated the effects of HDAC inhibitors on excessive alcohol intake in alcohol-dependent animals and explored associated modifications in the brain levels of acetylated histone H3. Finally we tested the effects of HDAC inhibitors on ethanol-induced behavioral locomotor sensitization in mice and analyzed alterations in striatal gene expression and both HDAC and HAT activities. Altogether our results show that HDAC inhibitor can reduce and / or prevent several behavioral effects of alcohol and that this effect of HDAC inhibitors can be due, at least in part, to epigenetic mechanism. # S31.3 GENETIC AND ENVIRONMENTAL RISKS FOR PATTERNS OF ALCOHOL USE FROM ADOLESCENCE THROUGH EARLY ADULTHOOD {#article-title-4} Purpose. Early and heavy initiation of alcohol use is a risk for later abuse and health problems; hence, identifying contributors to youth alcohol use is a central goal. This paper seeks to delineate trajectories of alcohol use and abuse from early adolescence through early adulthood, and identify environmental and genetic risk factors contributing to problematic patterns of early alcohol use. We compare four leading explanations for problematic alcohol use: social norms, social controls, stress, and genetic predispositions. Methods. Data were drawn from a nationally representative study of American youth (Add Health), following 20,745 youth from early adolescence through early adulthood. Youth reported on alcohol use and inebriation. Youth, parents, peers, and school administrators reported on social norms (parent drinking, peer drinking, schoolmate drinking), social controls (parental supervision, monitoring, school punishment), and stressful life events. A genetic risk score was calculated using DNA data on three dopaminergic polymorphisms (DRD4, DAT1, MAOA). Results. Trajectory analysis found five patterns of alcohol use from early adolescence through early adulthood, delineating abstainers, low users, early declining, early increasing, and late increasing patterns of alcohol use. Analyses identified four trajectories of inebriation: abstainers, low users, early declining, and increasing. Multilevel multinomial logistic regression models predicted patterns of drinking and inebriation, finding significant effects of social norms, social control, and life stressors for males' patterns of alcohol use and inebriation. For females, social norms, life stressors, and genetic risks were significant predictors of alcohol use and inebriation. Models found little evidence of gene by environment interactions. # S31.4 PRENATAL ETHANOL-INDUCED HYPERMETHYLATION OF PROOPIOMELANOCORTIN GENE TRANSMITS THROUGH GERMLINE {#article-title-5} We have recently shown that alcohol exposure during the fetal period permanently suppresses the expression of stress controlling beta-endorphin due to hypermethylation of it's precursor POMC gene. In this study, we determined the mechanism by which the POMC gene is hypermethylated. Additionally, transgenerational studies were conducted to evaluate the germline-transmitted effect of alcohol. We found that fetal alcohol exposure decreased the levels of the activation histone marks H3K4, aceH3K9 and pH3S10 in POMC neurons, and increased the repressive histone mark H3K9. The fetal alcohol exposure also altered the protein levels and gene expression of POMC, Set7/9, CBP, HDAC2, G9a, Setdb1, MeCP2 and Dnmt1 except for Dnmt3a. Alcohol treatment also reduced the activation mark H3K4me3 along Exon 3 of POMC gene. Suppression of histone deacetylation and DNA methylation normalized POMC expression and functional abnormalities. Gestational choline supplementation also reversed alcohol-induced alteration in histone-modifying and DNA-methylating enzymes and normalized POMC gene promoter methylation, POMC gene expression and β-endorphin peptide production in POMC neurons. Fetal alcohol-induced POMC gene methylation, expression and functional defects persisted in the F2 and F3 male but not in female germline. Additionally, the hypermethylated POMC gene was detected in sperms of fetal alcohol exposed F1 offspring that was transmitted through F3 generation via male germline. Overall, these research findings collectively demonstrate that epigenetic changes contribute to the effects of fetal alcohol exposure on POMC gene expression as well as the perpetuation of abnormal POMC neuronal functions through subsequent generations via the male. (Supported by NIH Grant AA016695 and R37 AA08757).