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Addiction Biology

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https://www.readbyqxmd.com/read/29464814/drd2-promoter-methylation-and-measures-of-alcohol-reward-functional-activation-of-reward-circuits-and-clinical-severity
#1
L Cinnamon Bidwell, Hollis C Karoly, Rachel E Thayer, Eric D Claus, Angela D Bryan, Barbara J Weiland, Sophie YorkWilliams, Kent E Hutchison
Studies have identified strong associations between D2 receptor binding potential and neural responses to rewarding stimuli and substance use. Thus, D2 receptor perturbations are central to theoretical models of the pathophysiology of substance dependence, and epigenetic changes may represent one of the fundamental molecular mechanisms impacting the effects of alcohol exposure on the brain. We hypothesized that epigenetic alterations in the promoter region of the dopamine D2 receptor (DRD2) gene would be associated with cue-elicited activation of neural reward regions, as well as severity of alcohol use behavior...
February 21, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29457317/effects-of-alcohol-intoxication-on-self-reported-drinking-patterns-expectancies-motives-and-personality-a-randomized-controlled-experimental-study
#2
Sören Kuitunen-Paul, Elisabeth Obst, Ruth Schmidt, Christian Sommer, Paula T Kuitunen, Hans-Ulrich Wittchen, Ulrich S Zimmermann
Alcohol intoxication may affect self-reports of alcohol use and related constructs, such as impulsivity and dependence symptoms. Improved knowledge about potential systematic reporting biases induced by alcohol, e.g. through disinhibition, may be relevant for the assessment of intoxicated individuals both in clinical routine and research. We therefore randomly assigned 54 socially drinking males aged 18 to 19 without lifetime diagnosis of DSM-IV alcohol dependence to one of two experimental arms: either placebo infusion at day 1 and alcohol infusion at day 2, or vice versa...
February 19, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29441714/time-dependent-regional-brain-distribution-of-methadone-and-naltrexone-in-the-treatment-of-opioid-addiction
#3
Belin G Teklezgi, Annapurna Pamreddy, Sooraj Baijnath, Hendrik G Kruger, Tricia Naicker, Nirmala D Gopal, Thavendran Govender
Opioid addiction is a serious public health concern with severe health and social implications; therefore, extensive therapeutic efforts are required to keep users drug free. The two main pharmacological interventions, in the treatment of addiction, involve management with methadone an mu (μ)-opioid agonist and treatment with naltrexone, μ-opioid, kappa (κ)-opioid and delta (δ)-opioid antagonist. MET and NAL are believed to help individuals to derive maximum benefit from treatment and undergo a full recovery...
February 14, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29430793/medial-habenula-cholinergic-signaling-regulates-cocaine-associated-relapse-like-behavior
#4
Alberto J López, Yousheng Jia, André O White, Janine L Kwapis, Monica Espinoza, Philip Hwang, Rianne Campbell, Yasaman Alaghband, Om Chitnis, Dina P Matheos, Gary Lynch, Marcelo A Wood
Propensity to relapse, even following long periods of abstinence, is a key feature in substance use disorders. Relapse and relapse-like behaviors are known to be induced, in part, by re-exposure to drug-associated cues. Yet, while many critical nodes in the neural circuitry contributing to relapse have been identified and studied, a full description of the networks driving reinstatement of drug-seeking behaviors is lacking. One area that may provide further insight to the mechanisms of relapse is the habenula complex, an epithalamic region composed of lateral and medial (MHb) substructures, each with unique cell and target populations...
February 12, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29424043/sex-differences-in-binge-like-etoh-drinking-corticotropin-releasing-hormone-and-corticosterone-effects-of-%C3%AE-endorphin
#5
Todd B Nentwig, Diane E Wilson, Erin M Rhinehart, Judith E Grisel
Binge drinking is an increasingly common pattern of risky use associated with numerous health problems, including alcohol use disorders. Because low basal plasma levels of β-endorphin (β-E) and an increased β-E response to alcohol are evident in genetically at-risk human populations, this peptide is thought to contribute to the susceptibility for disordered drinking. Animal models suggest that the effect of β-E on consumption may be sex-dependent. Here, we studied binge-like EtOH consumption in transgenic mice possessing varying levels of β-E: wild-type controls with 100% of the peptide (β-E +/+), heterozygous mice constitutively modified to possess 50% of wild-type levels (β-E +/-) and mice entirely lacking the capacity to synthesize β-E (-/-)...
February 8, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29423994/functional-effects-of-synthetic-cannabinoids-versus-%C3%AE-9-thc-in-mice-on-body-temperature-nociceptive-threshold-anxiety-cognition-locomotor-exploratory-parameters-and-depression
#6
Shaul Schreiber, Miaad Bader, Tatiana Lenchinski, Inbar Meningher, Vardit Rubovitch, Yiffat Katz, Etia Cohen, Yankel Gabet, Michal Rotenberg, Ehud Udi Wolf, Chaim G Pick
Synthetic cannabinoids are psychoactive substances designed to mimic the euphorigenic effects of the natural cannabis. Novel unregulated compounds appear once older compounds become illegal. It has been previously reported that synthetic cannabinoids are different than Δ9 -tetrahydrocannabinol (Δ9 -THC) as they have chemical structures unrelated to Δ9 -THC, different metabolism and, often, greater toxicity. This study aimed to investigate the effects of three novel synthetic cannabinoids and pure Δ9 -THC on body temperature, nociceptive threshold, anxiety, memory function, locomotor and exploratory parameters, and depression...
February 8, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29405517/activation-of-amylin-receptors-attenuates-alcohol-mediated-behaviours-in-rodents
#7
Aimilia Lydia Kalafateli, Daniel Vallöf, Elisabet Jerlhag
Alcohol expresses its reinforcing properties by activating areas of the mesolimbic dopamine system, which consists of dopaminergic neurons projecting from the ventral tegmental area to the nucleus accumbens. The findings that reward induced by food and addictive drugs involve common mechanisms raise the possibility that gut-brain hormones, which control appetite, such as amylin, could be involved in reward regulation. Amylin decreases food intake, and despite its implication in the regulation of natural rewards, tenuous evidence support amylinergic mediation of artificial rewards, such as alcohol...
February 6, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29363229/acupuncture-inhibition-of-methamphetamine-induced-behaviors-dopamine-release-and-hyperthermia-in-the-nucleus-accumbens-mediation-of-group-ii-mglur
#8
Nam Jun Kim, Yeonhee Ryu, Bong Hyo Lee, Suchan Chang, Yu Fan, Young S Gwak, Chae Ha Yang, Kyle B Bills, Scott C Steffensen, Jin Suk Koo, Eun Young Jang, Hee Young Kim
Methamphetamine (METH) increases metabolic neuronal activity in the mesolimbic dopamine (DA) system and mediates the reinforcing effect. To explore the underlying mechanism of acupuncture intervention in reducing METH-induced behaviors, we investigated the effect of acupuncture on locomotor activity, ultrasonic vocalizations, extracellular DA release in the nucleus accumbens (NAcs) using fast-scan cyclic voltammetry and alterations of brain temperature (an indicator of local brain metabolic activity) produced by METH administration...
January 23, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29318708/cocaine-conditioned-place-preference-unexpected-suppression-of-preference-due-to-testing-combined-with-strong-conditioning
#9
Lucile Marion-Poll, Antoine Besnard, Sophie Longueville, Emmanuel Valjent, Olivia Engmann, Jocelyne Caboche, Denis Hervé, Jean-Antoine Girault
Conditioned place preference (CPP) is widely used for evaluating the rewarding effects of drugs. Like other memories, CPP is proposed to undergo reconsolidation during which it is unstable and sensitive to pharmacological inhibition. Previous studies have shown that cocaine CPP can be apparently erased by extracellular signal-regulated kinase (ERK) pathway inhibition during cocaine reconditioning (re-exposure to the drug-paired environment in the presence of the drug). Here, we show that blockade of D1 receptors during reconditioning prevented ERK activation and induced a loss of CPP...
January 10, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29318700/time-course-and-dynamics-of-obesity-related-behavioral-changes-induced-by-energy-dense-foods-in-mice
#10
Jose Espinosa-Carrasco, Aurelijus Burokas, Marta Fructuoso, Ionas Erb, Elena Martín-García, Miriam Gutiérrez-Martos, Cedric Notredame, Rafael Maldonado, Mara Dierssen
Obesity represents an important risk factor contributing to the global burden of disease. The current obesogenic environment with easy access to calorie-dense foods is fueling this obesity epidemic. However, how these foods contribute to the progression of feeding behavior changes that lead to overeating is not well understood and needs systematic assessment. Using novel automated methods for the high-throughput screening of behavior, we here examine mice meal pattern upon long-term exposure to a free-choice chocolate-mixture diet and a high-fat diet with face validity for a rapid development of obesity induced by unhealthy food regularly consumed in our societies...
January 10, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29316088/beyond-genome-wide-significance-integrative-approaches-to-the-interpretation-and-extension-of-gwas-findings-for-alcohol-use-disorder
#11
Jessica E Salvatore, Shizhong Han, Sean P Farris, Kristin M Mignogna, Michael F Miles, Arpana Agrawal
Alcohol use disorder (AUD) is a heritable complex behavior. Due to the highly polygenic nature of AUD, identifying genetic variants that comprise this heritable variation has proved to be challenging. With the exception of functional variants in alcohol metabolizing genes (e.g. ADH1B and ALDH2), few other candidate loci have been confidently linked to AUD. Genome-wide association studies (GWAS) of AUD and other alcohol-related phenotypes have either produced few hits with genome-wide significance or have failed to replicate on further study...
January 9, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29314464/chemogenetic-inhibition-of-direct-pathway-striatal-neurons-normalizes-pathological-cue-induced-reinstatement-of-drug-seeking-in-rats
#12
Lindsay M Yager, Aaron F Garcia, Elizabeth A Donckels, Susan M Ferguson
Addiction to drugs such as cocaine is marked by cycles of compulsive drug-taking and drug-seeking behavior. Although the transition to addiction is thought to recruit neural processes in dorsal striatum, little is known regarding the role of dorsal striatal projections to the substantia nigra (i.e. the direct pathway) in regulating these behaviors. Combining a Cre-recombinase-dependent chemogenetic approach with a cocaine self-administration paradigm that produces both low-risk and high-risk addiction phenotypes, we examined the effect of transiently decreasing direct pathway activity in the dorsomedial striatum on drug-taking and drug-seeking under conditions of normal and pathological drug use...
January 5, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29314376/validation-of-a-behavioral-economic-purchase-task-for-assessing-drug-abuse-liability
#13
James MacKillop, Nicholas I Goldenson, Matthew G Kirkpatrick, Adam M Leventhal
Behavioral economic purchase tasks quantify drug demand (i.e. reinforcing value of a drug) and have been used extensively to assess the value of various drugs among current users. However, purchase tasks have been rarely used with unfamiliar drugs to address a compound's abuse liability, and the current study sought to validate the paradigm in this capacity. Using a double-blind placebo-controlled within-subjects drug challenge design, the study evaluated differential drug demand on an experimental drug purchase task for a 20 mg dose of oral D-amphetamine (versus placebo), a prototypic psychostimulant, in 98 stimulant-naïve participants...
January 5, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29292566/appetitive-to-aversive-counter-conditioning-as-intervention-to-reduce-reinstatement-of-reward-seeking-behavior-the-role-of-the-serotonin-transporter
#14
Peter Karel, Amanda Almacellas-Barbanoj, Jeffrey Prijn, Anne-Marije Kaag, Liesbeth Reneman, Michel M M Verheij, Judith R Homberg
Counter-conditioning can be a valid strategy to reduce reinstatement of reward-seeking behavior. However, this has not been tested in laboratory animals with extended cocaine-taking backgrounds nor is it well understood, which individual differences may contribute to its effects. Here, we set out to investigate the influence of serotonin transporter (5-HTT) genotype on the effectiveness of counter-conditioning after extended access to cocaine self-administration. To this end, 5-HTT+/+ and 5-HTT-/- rats underwent a touch screen-based approach to test if reward-induced reinstatement of responding to a previously counter-conditioned cue is reduced, compared with a non-counter-conditioned cue, in a within-subject manner...
January 2, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29292565/acute-and-chronic-modulation-of-striatal-endocannabinoid-mediated-plasticity-by-nicotine
#15
Louise Adermark, Julia Morud, Amir Lotfi, Mia Ericson, Bo Söderpalm
The endocannabinoid (eCB) system modulates several phenomena related to addictive behaviors, and drug-induced changes in eCB signaling have been postulated to be important mediators of physiological and pathological reward-related synaptic plasticity. Here, we studied eCB-mediated long-term depression (eCB-LTD) in the dorsolateral striatum, a brain region critical for acquisition of habitual and automatic behavior. We report that nicotine differentially affects ex vivo eCB signaling depending on previous exposure in vivo...
January 2, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29282816/methamphetamine-binge-administration-dose-dependently-enhanced-negative-affect-and-voluntary-drug-consumption-in-rats-following-prolonged-withdrawal-role-of-hippocampal-fadd
#16
Rubén García-Cabrerizo, M Julia García-Fuster
While prior studies have established various interacting mechanisms and neural consequences (i.e. monoaminergic nerve terminal damage) that might contribute to the adverse effects caused by methamphetamine administration, the precise mechanisms that mediate relapse during withdrawal remain unknown. This study evaluated the long-term consequences of binge methamphetamine administration (three pulses/day, every 3 hours, 4 days, i.p.; dose-response: 2.5, 5 and 7.5 mg/kg) in adult Sprague-Dawley rats at two behavioral levels following 25 days of withdrawal: (1) negative affect (behavioral despair-forced-swim test, and anhedonia-1% sucrose consumption, two-bottle choice test) and (2) voluntary methamphetamine consumption (20 mg/l, two-bottle choice test)...
December 28, 2017: Addiction Biology
https://www.readbyqxmd.com/read/29282813/extinction-and-reinstatement-of-an-operant-responding-maintained-by-food-in-different-models-of-obesity
#17
Aurelijus Burokas, Elena Martín-García, Jose Espinosa-Carrasco, Ionas Erb, Jerome McDonald, Cedric Notredame, Mara Dierssen, Rafael Maldonado
A major problem in treating obesity is the high rate of relapse to abnormal food-taking habits after maintaining an energy balanced diet. Alterations of eating behavior such as compulsive-like behavior and lack of self-control over food intake play a critical role in relapse. In this study, we used an operant paradigm of food-seeking behavior on two different diet-induced obesity models, a free-choice chocolate-mixture diet and a high-fat diet with face validity for a rapid development of obesity or for unhealthy food regularly consumed in our societies...
December 28, 2017: Addiction Biology
https://www.readbyqxmd.com/read/29280252/sex-hormones-in-alcohol-consumption-a-systematic-review-of-evidence
#18
Almila Erol, Ada M-C Ho, Stacey J Winham, Victor M Karpyak
Sex hormones play an important role in establishing sex-distinctive brain structural and functional variations that could contribute to the sex differences in alcohol consumption behavior. Here, we systematically reviewed articles that studied sex hormone impacts on alcohol consumption and alcohol use disorder (AUD). An extensive literature search conducted in MEDLINE, PubMed, Scopus and CINAHL databases identified 776 articles, which were then evaluated for pre-specified criteria for relevance and quality assurance...
December 27, 2017: Addiction Biology
https://www.readbyqxmd.com/read/29280246/rich-club-and-reward-network-connectivity-as-endophenotypes-for-alcohol-dependence-a-diffusion-tensor-imaging-study
#19
Nabi Zorlu, Necip Çapraz, Esra Oztekin, Başak Bagci, Maria A Di Biase, Andrew Zalesky, Fazıl Gelal, Emre Bora, Ercan Durmaz, Lütfullah Beşiroğlu, Aybala Sarıçiçek
We aimed to examine the whole-brain white matter connectivity and local topology of reward system nodes in patients with alcohol use disorder (AUD) and unaffected siblings, relative to healthy comparison individuals. Diffusion-weighted magnetic resonance imaging scans were acquired from 18 patients with AUD, 15 unaffected siblings of AUD patients and 15 healthy controls. Structural networks were examined using network-based statistic and connectomic analysis. Connectomic analysis showed a significant ordered difference in normalized rich club organization (AUD < Siblings < Controls)...
December 27, 2017: Addiction Biology
https://www.readbyqxmd.com/read/29266563/rat-brain-cyp2d-activity-alters-in-vivo-central-oxycodone-metabolism-levels-and-resulting-analgesia
#20
Douglas M McMillan, Sharon Miksys, Rachel F Tyndale
Oxycodone is metabolized by CYP2D to oxymorphone. Despite oxymorphone being a more potent opioid-receptor agonist, its contribution to oxycodone analgesia may be minor because of low peripheral production, low blood-brain barrier permeability and central nervous system efflux. CYP2D metabolism within the brain may contribute to variation in central oxycodone and oxymorphone levels, thereby affecting analgesia. Brain CYP2D expression and activity are subject to exogenous regulation; nicotine induces rat brain, but not liver, CYP2D consistent with higher brain CYP2D in smokers...
December 21, 2017: Addiction Biology
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