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Author: Falk Kiefer (153)


Feb
2018

Background Addicted Internet users present with higher rates of comorbidities, e.g., attention-deficit hyperactivity disorder (ADHD), depressive, and anxiety disorders.

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Jan
2018

ADAM10 is a metalloproteinase acting on the amyloid precursor protein (APP) as an alpha-secretase in neurons. Its enzymatic activity results in secretion of a neuroprotective APP cleavage product (sAPP-alpha) and prevents formation of the amyloidogenic A-beta peptides, major hallmarks of Alzheimer's disease (AD). Elevated ADAM10 levels appeared to contribute to attenuation of A-beta-plaque formation and learning and memory deficits in AD mouse models.

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Dec
1969

Alcohol Use Disorder is a highly prevalent mental disorder which puts a severe burden on individuals, families, and society. The treatment of Alcohol Use Disorder is challenging and novel and innovative treatment approaches are needed to expand treatment options. A promising neuroscience-based intervention method that allows targeting cortical as well as subcortical brain processes is real-time functional magnetic resonance imaging neurofeedback.

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Jan
2018

ADHD is common in patients with alcohol dependence, but prevalence results are inconsistent. We investigated ADHD prevalence in a complex design to avoid over- or underdiagnosing.
Patients with alcohol dependence starting long-term residential treatment were included.

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Nov
2017

Approved pharmacological treatments for alcohol use disorder are limited in their effectiveness, and new drugs that can easily be translated into the clinic are warranted. One of those candidates is oxytocin because of its interaction with several alcohol-induced effects. Alcohol-dependent rats as well as post-mortem brains of human alcoholics and controls were analyzed for the expression of the oxytocin system by qRT-PCR, in situ hybridization, receptor autoradiography ([I]OVTA binding), and immunohistochemistry.

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Oct
2017

Alcohol metabolizing enzymes, such as the alcohol dehydrogenases and the aldehyde dehydrogenases, regulate the levels of acetaldehyde in the blood and play an important role in the development and maintenance of alcohol addiction. Recent genome-wide systematic searches found associations between a single nucleotide polymorphism (rs1789891, risk allele: A, protective allele: C) in the alcohol dehydrogenase gene cluster and the risk of alcohol dependence. The current study investigated the effect of this single nucleotide polymorphism on alcohol consumption, craving for alcohol, relapse risk and brain gray matter volume.

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Nov
2017

Recent data suggest that ghrelin is involved in the pathophysiology of alcohol use disorders, affecting alcohol self-administration and craving. Gastric ghrelin secretion is reduced by stomach distension. We now tested the hypothesis whether the clinically well-known effects of high-volume water intake on craving reduction in alcoholism is mediated by acute changes in ghrelin secretion.

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Dec
1969

Clinicians in the field of drug addiction have started to exploit the growth of Technology-Based Interventions (TBIs). However, there is little information on how health personnel evaluate them.
Semi-structured interviews were conducted among 20 European experts.

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Jul
2017

Genome-wide association study identifies inversion in thelocus to modify risk for alcoholic and non-alcoholic chronic pancreatitis.

Gut 2017 Jul 28. Epub 2017 Jul 28.
Jonas Rosendahl, Holger Kirsten, Eszter Hegyi, Peter Kovacs, Frank Ulrich Weiss, Helmut Laumen, Peter Lichtner, Claudia Ruffert, Jian-Min Chen, Emmanuelle Masson, Sebastian Beer, Constantin Zimmer, Katharina Seltsam, Hana Algül, Florence Bühler, Marco J Bruno, Peter Bugert, Ralph Burkhardt, Giulia Martina Cavestro, Halina Cichoz-Lach, Antoni Farré, Josef Frank, Giovanni Gambaro, Sebastian Gimpfl, Harald Grallert, Heidi Griesmann, Robert Grützmann, Claus Hellerbrand, Péter Hegyi, Marcus Hollenbach, Sevastitia Iordache, Grazyna Jurkowska, Volker Keim, Falk Kiefer, Sebastian Krug, Olfert Landt, Milena Di Leo, Markus M Lerch, Philippe Lévy, Markus Löffler, Matthias Löhr, Maren Ludwig, Milan Macek, Nuria Malats, Ewa Malecka-Panas, Giovanni Malerba, Karl Mann, Julia Mayerle, Sonja Mohr, Rene H M Te Morsche, Marie Motyka, Sebastian Mueller, Thomas Müller, Markus M Nöthen, Sergio Pedrazzoli, Stephen P Pereira, Annette Peters, Roland Pfützer, Francisco X Real, Vinciane Rebours, Monika Ridinger, Marcella Rietschel, Eva Rösmann, Adrian Saftoiu, Alexander Schneider, Hans-Ulrich Schulz, Nicole Soranzo, Michael Soyka, Peter Simon, James Skipworth, Felix Stickel, Konstantin Strauch, Michael Stumvoll, Pier Alberto Testoni, Anke Tönjes, Lena Werner, Jens Werner, Norbert Wodarz, Martin Ziegler, Atsushi Masamune, Joachim Mössner, Claude Férec, Patrick Michl, Joost P H Drenth, Heiko Witt, Markus Scholz, Miklós Sahin-Tóth,
Alcohol-related pancreatitis is associated with a disproportionately large number of hospitalisations among GI disorders. Despite its clinical importance, genetic susceptibility to alcoholic chronic pancreatitis (CP) is poorly characterised. To identify risk genes for alcoholic CP and to evaluate their relevance in non-alcoholic CP, we performed a genome-wide association study and functional characterisation of a new pancreatitis locus.

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May
2017

Individual differences in reward sensitivity along with weakened executive control are characteristic for alcohol use disorder (AUD). Emerging translational models of psychotherapy propose the integration of such neurobiological risk profiles to elucidate the mechanisms underlying behavior change in order to improve intervention efficacy. The primary aim of the study was to investigate whether striatal baseline reward sensitivity can be used as a neurobiological predictor of intervention-specific changes in neural functioning during AUD therapy.

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May
2017

According to prevailing neurobiological theories of addiction, altered function in neural reward circuitry is a central mechanism of alcohol dependence. Growing evidence postulates that the ventral striatum (VS), as well as areas of the prefrontal cortex, contribute to the increased incentive salience of alcohol-associated cues, diminished motivation to pursue non-drug rewards and weakened strength of inhibitory cognitive control, which are central to addiction. The present study aims to investigate the neural response and functional connectivity underlying monetary, non-drug reward processing in alcohol dependence.

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Jun
2017

Threshold-free cluster enhancement (TFCE) is a sensitive means to incorporate spatial neighborhood information in neuroimaging studies without using arbitrary thresholds. The majority of methods have applied TFCE to voxelwise data. The need to understand the relationship among multiple variables and imaging modalities has become critical.

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Dec
1969

Addicts to specific internet applications involving communication features showed increased social anxiety, emotional competence deficits and impaired prefrontal-related inhibitory control. The dorsal Anterior Cingulate Cortex (dACC) likely plays an important role in cognitive control and negative affect (such as social exclusion, pain or anxiety).
To assess (social) anxiety-related inhibitory control in specific internet addiction (addicted use of games and social networks) and its relation to altered dACC activation.

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Feb
2017

Both chronic alcohol consumption and alcohol withdrawal lead to neural tissue damage which partly recovers during abstinence. This study investigated withdrawal-associated changes in glutamatergic compounds, markers of neuronal integrity, and gray matter volumes during acute alcohol withdrawal in the hippocampus, a key region in development and maintenance of alcohol dependence in humans and rats.
Alcohol-dependent patients (N = 39) underwent magnetic resonance imaging (MRI) and MR spectroscopy (MRS) measurements within 24 hours after the last drink and after 2 weeks of abstinence.

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Dec
1969

Ghrelin, which is mainly released from the stomach, is the most important orexigenic regulator of food intake, inducing appetite, enhancing adiposity and releasing growth hormone. Besides the hypothalamus, ghrelin receptors (GHS-R1A) are also expressed in the mesolimbic dopaminergic system, which increases the possibility that ghrelin plays an important role in reward regulation for substance use disorders such as alcohol addiction, especially through activating the cholinergic-dopaminergic reward link. In this review we focus on the impact of ghrelin on the development and maintenance of alcohol addiction/dependence, alcohol consumption, alcohol craving and alcohol withdrawal, attempting to integrate preclinical and clinical studies concerning the intriguing relationship between appetite regulation, reward and alcohol addiction.

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Jan
2017

Recently, calcium was suggested to be the active moiety of acamprosate. We examined plasma calcium concentrations in association with severity of alcohol dependence and its interaction with regulating pathways and alcohol craving in alcohol-dependent patients. 47 inpatient alcohol-dependent patients undergoing detoxification treatment underwent laboratory testing, including calcium, sodium, liver enzymes as well as serum concentrations of calcitonin, parathyroid hormone and vitamin D.

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Sep
2016

In obese individuals impaired sleep and neuroendocrine alterations such as melatonin deficits are associated with circadian rhythm disruption, altered circadian clock gene expression, and bright light at night. While the relation of pineal gland volume (PGV) and melatonin levels has recently been documented in humans, surprisingly little is known about the possible interference of the PGV and the pathophysiology of obesity in humans.
We therefore compared the PGV of obese with non-obese individuals; both groups were matched by age and gender.

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Feb
2017

Blockade of the μ-opioid receptor (MOR) by naltrexone reduces relapse risk in a subpopulation of alcohol-dependent patients. Previous positron-emission-tomography (PET) studies using the MOR ligand [C]carfentanil have found increased MOR availability in abstinent alcoholics, which may reflect either increased MOR expression or lower endogenous ligand concentration. To differentiate between both effects, we investigated two cohorts of alcoholic subjects using either post-mortem or clinical PET analysis.

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Sep
2016

Background and aims Internet gaming addiction appears to be related to self-concept deficits and increased angular gyrus (AG)-related identification with one's avatar. For increased social network use, a few existing studies suggest striatal-related positive social feedback as an underlying factor. However, whether an impaired self-concept and its reward-based compensation through the online presentation of an idealized version of the self are related to pathological social network use has not been investigated yet.

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Dec
1969

Atrial natriuretic peptide (ANP) receptors are highly expressed in the amygdala, caudate and hypothalamus. GATA4 gene encodes a transcription factor of ANP associated with the pathophysiology of alcohol dependence. We have previously demonstrated that the GATA4 single nucleotide polymorphism (SNP) rs13273672 revealed stronger alcohol-specific amygdala activation associated with lowered relapse risk to heavy drinking at 90 days in the AA-homozygotes.

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Aug
2016

Common variants in the gene GATA binding protein 4 (GATA4) show association with alcohol dependence (AD). The aim of this study was to identify rare variants in GATA4 in order to elucidate the role of this gene in AD susceptibility. Identification of rare variants may provide a more complete picture of the allelic architecture at this risk locus.

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May
2016

Tobacco smoking modulates activity in the hypothalamic-pituitary-adrenal (HPA) axis and is used to cope with stress, especially by females. The single nucleotide polymorphism (SNP) rs1360780, linked to FK506-binding protein 51 (FKBP5), has been shown to affect HPA axis functioning, and has thus been suggested as a promising candidate for indicating vulnerability to stress-related disorders. The aim of this study was to investigate the interaction between nicotine consumption and rs1360780 on cortisol plasma levels in females.

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May
2017

Neuroimaging in pathological gambling (PG) allows studying brain structure independent of pharmacological/neurotoxic effects occurring in substance addiction. Because of high comorbidity of PG with substance use disorder (SUD), first results on structural deficits in PG are controversial. The current investigation is the first to examine gray matter (GM) volume alterations in PG controlling for the impact of SUD by comparing non-comorbid (PG) and two comorbid (PGand PG) groups.

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Jan
2016

Harm avoidance is a personality trait characterized by excessive worrying and fear of uncertainty, which has repeatedly been related to anxiety disorders. Converging lines of research in rodents and humans point towards an involvement of the nicotinic cholinergic system in the modulation of anxiety. Most notably, the rs1044396 polymorphism in the CHRNA4 gene, which codes for the α4 subunit of the nicotinic acetylcholine receptor, has been linked to negative emotionality traits including harm avoidance in a recent study.

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Dec
2015

Alcohol misuse is the leading cause of cirrhosis and the second most common indication for liver transplantation in the Western world. We performed a genome-wide association study for alcohol-related cirrhosis in individuals of European descent (712 cases and 1,426 controls) with subsequent validation in two independent European cohorts (1,148 cases and 922 controls). We identified variants in the MBOAT7 (P = 1.

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Mar
2016

Association of the OPRM1 Variant rs1799971 (A118G) with Non-Specific Liability to Substance Dependence in a Collaborative de novo Meta-Analysis of European-Ancestry Cohorts.

Behav Genet 2016 Mar 21;46(2):151-69. Epub 2015 Sep 21.
Tae-Hwi Schwantes-An, Juan Zhang, Li-Shiun Chen, Sarah M Hartz, Robert C Culverhouse, Xiangning Chen, Hilary Coon, Josef Frank, Helen M Kamens, Bettina Konte, Leena Kovanen, Antti Latvala, Lisa N Legrand, Brion S Maher, Whitney E Melroy, Elliot C Nelson, Mark W Reid, Jason D Robinson, Pei-Hong Shen, Bao-Zhu Yang, Judy A Andrews, Paul Aveyard, Olga Beltcheva, Sandra A Brown, Dale S Cannon, Sven Cichon, Robin P Corley, Norbert Dahmen, Louisa Degenhardt, Tatiana Foroud, Wolfgang Gaebel, Ina Giegling, Stephen J Glatt, Richard A Grucza, Jill Hardin, Annette M Hartmann, Andrew C Heath, Stefan Herms, Colin A Hodgkinson, Per Hoffmann, Hyman Hops, David Huizinga, Marcus Ising, Eric O Johnson, Elaine Johnstone, Radka P Kaneva, Kenneth S Kendler, Falk Kiefer, Henry R Kranzler, Ken S Krauter, Orna Levran, Susanne Lucae, Michael T Lynskey, Wolfgang Maier, Karl Mann, Nicholas G Martin, Manuel Mattheisen, Grant W Montgomery, Bertram Müller-Myhsok, Michael F Murphy, Michael C Neale, Momchil A Nikolov, Denise Nishita, Markus M Nöthen, John Nurnberger, Timo Partonen, Michele L Pergadia, Maureen Reynolds, Monika Ridinger, Richard J Rose, Noora Rouvinen-Lagerström, Norbert Scherbaum, Christine Schmäl, Michael Soyka, Michael C Stallings, Michael Steffens, Jens Treutlein, Ming Tsuang, Tamara L Wall, Norbert Wodarz, Vadim Yuferov, Peter Zill, Andrew W Bergen, Jingchun Chen, Paul M Cinciripini, Howard J Edenberg, Marissa A Ehringer, Robert E Ferrell, Joel Gelernter, David Goldman, John K Hewitt, Christian J Hopfer, William G Iacono, Jaakko Kaprio, Mary Jeanne Kreek, Ivo M Kremensky, Pamela A F Madden, Matt McGue, Marcus R Munafò, Robert A Philibert, Marcella Rietschel, Alec Roy, Dan Rujescu, Sirkku T Saarikoski, Gary E Swan, Alexandre A Todorov, Michael M Vanyukov, Robert B Weiss, Laura J Bierut, Nancy L Saccone
The mu1 opioid receptor gene, OPRM1, has long been a high-priority candidate for human genetic studies of addiction. Because of its potential functional significance, the non-synonymous variant rs1799971 (A118G, Asn40Asp) in OPRM1 has been extensively studied, yet its role in addiction has remained unclear, with conflicting association findings. To resolve the question of what effect, if any, rs1799971 has on substance dependence risk, we conducted collaborative meta-analyses of 25 datasets with over 28,000 European-ancestry subjects.

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Dec
1969

We explored brain volume recovery in terms of cortical thickness (CTh; gyral, sulcal pattern) and surface area (SA), as well as subcortical volume recovery in the first 2 weeks of abstinence in 49 alcohol-dependent patients (ADPs). A widespread reduction of CTh in ADPs at day 1 of abstinence compared to healthy controls, with more pronounced differences in sulci relative to gyri was found. After 2 weeks of abstinence, partial recovery to varying degrees of CTh loss in ADPs was observed for several regions.

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Nov
2015

The aim of the current study was to determine genotype effects of four single nucleotide polymorphisms (SNPs) in the genes of the N-Methyl-d-aspartate receptor (GRIN1, GRIN2A, GRIN2C) and kainate receptor (GRIK1), which have been previously associated with alcoholism, on behavior, neural cue-reactivity and drinking outcome. Eighty-six abstinent alcohol dependent patients were recruited from an in-patient setting. Neuropsychological tests, genotyping and functional magnetic resonance imaging (fMRI) were used to study genotype effects.

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Jul
2016

It has been shown that in alcoholic patients, alcohol-related cues produce increased activation of reward-related brain regions like the ventral striatum (VS), which has been proposed as neurobiological basis of craving. Modulating this activation might be a promising option in the treatment of alcohol addiction. One approach might be real-time functional magnetic resonance imaging neurofeedback (rtfMRI NF).

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Aug
2015

The endogenous opioid system is involved in the pathophysiology of alcohol-use disorders. Genetic variants of the opioid system alter neural and behavioral responses to alcohol. In particular, a single nucleotide polymorphism rs1799971 (A118G) in the mu-opioid receptor gene (OPRM1) is suggested to modulate alcohol-related phenotypes and neural response in the mesocorticolimbic dopaminergic system.

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Dec
1969

Weight gain is a common but only a partially understood consequence of smoking cessation. Existing data suggest modulating effects of the orexigenic peptide ghrelin on food intake. The aim of the present study was to investigate the effect of tobacco withdrawal on plasma concentration of acetylated and total ghrelin.

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Jul
2015

Mesocorticolimbic reactivity to alcohol-associated cues has been shown to be associated with relapse to renewed drinking and to be decreased by cue-exposure-based extinction training (CET). Evidence from preclinical studies suggests that the extinction of conditioned alcohol-seeking behavior might be facilitated by drugs increasing N-methyl-D-aspartate (NMDA) receptor-associated memory consolidation.
In this study, we assessed the efficacy of CET treatment supplemented with the partial NMDA-receptor agonist D-cycloserine (DCS) at reducing mesolimbic cue reactivity (CR), craving, and relapse risk in alcoholism.

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Feb
2015

Alcohol consumption has been suggested to be associated with a dysregulation in habit formation and execution in dependent patients. Although there are established craving questionnaires assessing various components of craving, to our knowledge, no questionnaire exists to assess habitual and automated substance intake. In this study, we present and validate the "Craving Automated Scale for Alcohol" (CAS-A), a newly developed questionnaire assessing craving and other components of automated addictive behavior.

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Jul
2015

The treatment of cocaine dependence is difficult as no approved pharmacotherapy is available as yet. However, in preclinical and clinical trials, a variety of compounds were tested for suitability as inhibitors of craving for and relapse into the use of cocaine, among these antidepressants, antiepileptics, dopamine agonists, disulfiram, and naltrexone. Nalmefene, a structural derivative of naltrexone, shares with its parent compound approval (granted by the European Medical Agency in 2013) as a medication for the treatment of alcohol addiction in the European Union.

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Nov
2014

Effect sizes of pharmacotherapy in alcoholism are modest. They might improve if subjects could be divided into more homogeneous subgroups and would then be treated targeted to their neurobiological profile. In such an effort, we tested neural cue reactivity as a potential predictor of treatment response to naltrexone.

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Feb
2015

Psychometric studies suggest that observed self-concept deficits in addicted massively multiplayer online role-playing game (MMORPG) are compensated through the replacement of their ideal (i.e., how an individual would like to be) by their own avatar (i.

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Dec
1969

Alcohol dependence is one of the leading contributors to the burden of disease in the world. A range of genetic and environmental risk factors has been identified to date, and preclinical and clinical studies including imaging studies have identified neuronal networks involved in the development of alcohol dependence.
We review genetic and environmental risk factors for the development of alcohol addiction as well as structural and neuronal changes, including their transmitter systems, due to regular alcohol intake.

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Dec
2014

Previous research on alcohol dependent patients has shown that variations in eyeblink startle response can be used as an indicator of their emotional responses to alcohol-related stimuli. Postulating that reactions on substance associated stimuli are controlled by either a negative or a positive affective processing system, we expect that abstinent alcoholics react differently (within-group) in the emotional evaluation of alcohol cues. Furthermore, we assumed the startle response to covary with medication response to acamprosate and naltrexone.

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Nov
2014

Obesity has emerged as a leading health threat but its biological basis remains insufficiently known, hampering the search for novel treatments. Here, we study oleoylethanolamide, a naturally occurring lipid that has been clearly implicated in weight regulation in animals. However, its role for weight regulation and obesity in humans is still unclear.

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Dec
2014

MMORPG addiction has been associated with self-concept impairments and increased identification with the own avatar. Yet, the underlying neurobiological mechanisms of self-identification with avatars, especially reflected in the left angular gyrus (AG), have only been assessed in regular gamers. Therefore, the study aims to examine neurobiological processes in addicted MMORPG players while evaluating their own and their personal avatar's body image (physical self-concept).

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Jan
2015

Genetic factors have as large role as environmental factors in the etiology of alcohol dependence (AD). Although genome-wide association studies (GWAS) enable systematic searches for loci not hitherto implicated in the etiology of AD, many true findings may be missed owing to correction for multiple testing. The aim of the present study was to circumvent this limitation by searching for biological system-level differences, and then following up these findings in humans and animals.

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Jul
2014

Research focusing on plasticity has shown adult neurogenesis in hippocampal subfields. Chronic alcoholism is associated with decreased plasticity and reduced whole hippocampal volume that could contribute to neuropsychiatric characteristics and outcome of the disease.
To investigate the effect of alcohol abstinence on neuronal plasticity measured as longitudinal volume change in distinct hippocampal subfields.

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Dec
1969

A pooled analysis of 'as-needed medication use' data from 1,276 patients in two randomised, double-blind, placebo-controlled, parallel-group trials of nalmefene in the treatment of alcohol dependence was performed to explore whether an 'as-needed' regimen is an acceptable and feasible strategy in patients seeking help for alcohol dependence. Adherence was defined as alcohol consumption and medication intake, or no alcohol consumption (with or without medication intake). Nalmefene was taken on approximately half of the study days; placebo was taken more often than nalmefene (52.

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