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Addiction Biology

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https://www.readbyqxmd.com/read/29761890/glucocorticoid-receptor-gene-variants-and-lower-expression-of-nr3c1-are-associated-with-cocaine-use
#1
Andrea B Schote, Kristina Jäger, Sara L Kroll, Matthias Vonmoos, Lea M Hulka, Katrin H Preller, Jobst Meyer, Edna Grünblatt, Boris B Quednow
Animal and cross-sectional human studies suggest that chronic cocaine use is associated with altered responsivity of the hypothalamic-pituitary-adrenal axis to stress. Moreover, increased susceptibility to stress has been proposed as an important factor for development, maintenance and relapse of cocaine addiction. As the glucocorticoid receptor gene (NR3C1) mediates genomic effects of the stress hormone cortisol, we investigated NR3C1 expression and the association of NR3C1 genotypes with cocaine use, addiction and comorbid psychiatric symptoms in 126 chronic cocaine users and 98 stimulant-naïve healthy controls...
May 15, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29750384/effects-of-moderate-voluntary-ethanol-consumption-on-the-rat-and-human-gut-microbiome
#2
Kassi L Kosnicki, Jerrold C Penprase, Patricia Cintora, Pedro J Torres, Greg L Harris, Susan M Brasser, Scott T Kelley
Many alcohol-induced health complications are directly attributable to the toxicity of alcohol or its metabolites, but another potential health impact of alcohol may be on the microbial communities of the human gut. Clear distinctions between healthy and diseased-state gut microbiota have been observed in subjects with metabolic diseases, and recent studies suggest that chronic alcoholism is linked to gut microbiome dysbiosis. Here, we investigated the effects of moderate levels of alcohol consumption on the gut microbiome in both rats and humans...
May 11, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29737638/preventing-morphine-reinforcement-with-high-frequency-deep-brain-stimulation-of-the-lateral-hypothalamic-area
#3
Mojdeh Fattahi, Ghorbangol Ashabi, Seyed Morteza Karimian, Esmail Riahi
Deep brain stimulation (DBS) has been proposed as a promising intervention for patients with treatment-refractory substance use disorder. Here, we investigated if high-frequency DBS in the lateral hypothalamic area (LHA) could affect drug-induced reinforcement. Rats were bilaterally implanted with bipolar stimulation electrodes in the LHA and trained to the morphine conditioned place preference. DBS (monophasic square pulses, 130 Hz, 100-microsecond pulse duration and 150 μA) was applied during the morphine-pairing trials (30 minutes daily for 4 days) or drug-free postconditioning test (15 minutes) to determine its effect on the acquisition or expression of morphine reward, respectively...
May 8, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29737034/distress-intolerance-moderation-of-motivated-attention-to-cannabis-and-negative-stimuli-after-induced-stress-among-cannabis-users-an-erp-study
#4
Richard J Macatee, Sarah A Okey, Brian J Albanese, Norman B Schmidt, Jesse R Cougle
Prevalence of cannabis use is increasing, but many regular users do not develop cannabis use disorder (CUD); thus, CUD risk identification among current users is vital for targeted intervention development. Existing data suggest that high distress intolerance (DI), an individual difference reflective of the ability to tolerate negative affect, may be linked to CUD, but no studies have tested possible neurophysiological mechanisms. Increased motivated attentional processing of cannabis and negative emotional stimuli as indexed by neurophysiology [i...
May 7, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29726093/effects-of-heroin-on-rat-prosocial-behavior
#5
Seven E Tomek, Gabriela M Stegmann, M Foster Olive
Opioid use disorders are characterized in part by impairments in social functioning. Previous research indicates that laboratory rats, which are frequently used as animal models of addiction-related behaviors, are capable of prosocial behavior. For example, under normal conditions, when a 'free' rat is placed in the vicinity of rat trapped in a plastic restrainer, the rat will release or 'rescue' the other rat from confinement. The present study was conducted to determine the effects of heroin on prosocial behavior in rats...
May 4, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29726054/gdnf-and-alcohol-use-disorder
#6
Segev Barak, Somayeh Ahmadiantehrani, Marian L Logrip, Dorit Ron
Glial cell line-derived neurotrophic factor (GDNF) has been extensively studied for its role in the development and maintenance of the midbrain dopaminergic system, although evidence suggests that GDNF also plays a role in drug and alcohol addiction. This review focuses on the unique actions of GDNF in the mechanisms that prevent the transition from recreational alcohol use to abuse. Specifically, we describe studies in rodents suggesting that alcohol acutely increases GDNF expression in the ventral tegmental area, which enables the activation of the mitogen-activated protein kinase signaling pathway and the gating of alcohol intake...
May 4, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29717793/drug-induced-dysphoria-is-enhanced-following-prolonged-cocaine-abstinence-and-dynamically-tracked-by-nucleus-accumbens-neurons
#7
Rachel M Haake, Elizabeth A West, Xuefei Wang, Regina M Carelli
Negative reinforcement models postulate that addicts use drugs to alleviate negative affective states (e.g. dysphoria) associated with withdrawal. In a pre-clinical model, rats exhibit negative affect to a normally rewarding tastant when it predicts impending, but delayed cocaine, and nucleus accumbens (NAc) neurons dynamically track this state. Here, we examined the effects of short versus prolonged experimenter-imposed cocaine abstinence on negative affect, cocaine seeking and self-administration. Rats were given 14 saccharin-cocaine sessions; NAc activity and affective responses to the taste (i...
May 2, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29667304/inhibition-of-alpha7-nicotinic-receptors-in-the-ventral-hippocampus-selectively-attenuates-reinstatement-of-morphine-conditioned-place-preference-and-associated-changes-in-ampa-receptor-binding
#8
Victoria L Wright, Polymnia Georgiou, Alexis Bailey, David J Heal, Christopher P Bailey, Susan Wonnacott
Recurrent relapse is a major problem in treating opiate addiction. Pavlovian conditioning plays a role in recurrent relapse whereby exposure to cues learned during drug intake can precipitate relapse to drug taking. α7 nicotinic acetylcholine receptors (nAChRs) have been implicated in attentional aspects of cognition and mechanisms of learning and memory. In this study we have investigated the role of α7 nAChRs in morphine-conditioned place preference (morphine-CPP). CPP provides a model of associative learning that is pertinent to associative aspects of drug dependence...
April 17, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29665166/silencing-synaptic-microrna-411-reduces-voluntary-alcohol-consumption-in-mice
#9
Dana Most, Nihal A Salem, Gayatri R Tiwari, Yuri A Blednov, R Dayne Mayfield, R Adron Harris
Chronic alcohol consumption alters the levels of microRNAs and mRNAs in the brain, but the specific microRNAs and processes that target mRNAs to affect cellular function and behavior are not known. We examined the in vivo manipulation of previously identified alcohol-responsive microRNAs as potential targets to reduce alcohol consumption. Silencing of miR-411 by infusing antagomiR-411 into the prefrontal cortex of female C57BL/6J mice reduced alcohol consumption and preference, without altering total fluid consumption, saccharin consumption, or anxiety-related behaviors...
April 17, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29659126/guanfacine-decreases-symptoms-of-cannabis-withdrawal-in-daily-cannabis-smokers
#10
Margaret Haney, Ziva D Cooper, Gillinder Bedi, Evan Herrmann, Sandra D Comer, Stephanie Collins Reed, Richard W Foltin, Frances R Levin
The α2a-adrenergic agonist, lofexidine, reduced cannabis withdrawal-related sleep disruption in the laboratory, but side effects (e.g. fatigue, hypotension) limit its utility as a treatment for cannabis use disorder. This study tested the potential efficacy and tolerability of a daily bedtime administration of the FDA-approved α2a-adrenergic agonist, guanfacine, in a human laboratory model of cannabis use disorder. Daily, nontreatment-seeking cannabis smokers (13M, 2F) completed a within-subject study comprising two 9-day inpatient study phases...
April 16, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29575323/clozapine-reduces-nicotine-self-administration-blunts-reinstatement-of-nicotine-seeking-but-increases-responding-for-food
#11
Andrew R Abela, Zhaoxia Li, Anh D Lê, Paul J Fletcher
People with schizophrenia display significantly higher rates of smoking than the general population, which may be due to an interaction between nicotine and antipsychotic medication. While the conventional antipsychotic drug haloperidol sometimes increases cigarette smoking in patients with schizophrenia, there is some evidence suggesting that clozapine, an atypical antipsychotic drug, may reduce nicotine use in these patients. However, the effects of antipsychotic drugs like clozapine on aspects of nicotine self-administration and reinstatement have not been systematically examined...
March 25, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29569345/fish-oil-treatment-reduces-chronic-alcohol-exposure-induced-synaptic-changes
#12
Zhe Shi, Youna Xie, Huixia Ren, Baixuan He, Meng Wang, Jian-Bo Wan, Ti-Fei Yuan, Xiaoli Yao, Huanxing Su
Alcohol addiction is a chronic neuropsychiatric disorder that represents one of the most serious global public health problems. Yet, currently there still lacks an effective pharmacotherapy. Omega-3 polyunsaturated fatty acids (N-3 PUFAs) have exhibited beneficial effects in a variety of neurological disorders, particularly in reversing behavioral deficits and neurotoxicity induced by prenatal alcohol exposure and binge drinking. In the present study, we investigated if fish oil, which is rich in N-3 PUFAs, had beneficial effects on preventing relapse and alleviating withdrawal symptoms after chronic alcohol exposure...
March 22, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29532581/genome-wide-association-study-in-finnish-twins-highlights-the-connection-between-nicotine-addiction-and-neurotrophin-signaling-pathway
#13
Jenni Hällfors, Teemu Palviainen, Ida Surakka, Richa Gupta, Jadwiga Buchwald, Anu Raevuori, Samuli Ripatti, Tellervo Korhonen, Pekka Jousilahti, Pamela A F Madden, Jaakko Kaprio, Anu Loukola
The heritability of nicotine dependence based on family studies is substantial. Nevertheless, knowledge of the underlying genetic architecture remains meager. Our aim was to identify novel genetic variants responsible for interindividual differences in smoking behavior. We performed a genome-wide association study on 1715 ever smokers ascertained from the population-based Finnish Twin Cohort enriched for heavy smoking. Data imputation used the 1000 Genomes Phase I reference panel together with a whole genome sequence-based Finnish reference panel...
March 13, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29516676/drinking-despite-adversity-behavioral-evidence-for-a-head-down-and-push-strategy-of-conflict-resistant-alcohol-drinking-in-rats
#14
David Darevsky, Thomas Michael Gill, Katherine Rose Vitale, Bing Hu, Scott Andrew Wegner, Frederic Woodward Hopf
Compulsive alcohol drinking, where intake persists regardless of adverse consequences, plays a major role in the substantial costs of alcohol use disorder. However, the processes that promote aversion-resistant drinking remain poorly understood. Compulsion-like responding has been considered automatic and reflexive and also to involve higher motivation, since drinking persists despite adversity. Thus, we used lickometry, where microstructural behavioral changes can reflect altered motivation, to test whether conflict-resistant intake [quinine-alcohol (QuiA)] reflected greater automaticity or motivation relative to alcohol-only drinking (Alc)...
March 8, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29516603/evidence-of-subgroups-in-smokers-as-revealed-in-clinical-measures-and-evaluated-by-neuroimaging-data-a-preliminary-study
#15
Xiaoyu Ding, Betty Jo Salmeron, Jamei Wang, Yihong Yang, Elliot A Stein, Thomas J Ross
To date, fractionation of the nicotine addiction phenotype has been limited to that based primarily on characteristics of cigarette use, although it is widely appreciated that a variety of individual factors are associated with tobacco use disorder. Identifying subtypes of tobacco use disorder based on such factors may lead to better understanding of potential treatment targets, individualize treatments and improve outcomes. In this preliminary study, to identify potential subgroups, we applied hierarchical clustering to a broad range of assessments measuring personality, IQ and psychiatric symptoms, as well as various environmental and experiential characteristics from 102 otherwise healthy cigarette smokers...
March 8, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29516602/ago2-and-dicer1-are-involved-in-meth-induced-locomotor-sensitization-in-mice-via-biogenesis-of-mirna
#16
Dan Liu, Li Zhu, Tong Ni, Fang-Lin Guan, Yan-Jiong Chen, Dong-Liang Ma, Eyleen L K Goh, Teng Chen
microRNA (miRNA) play important roles in drug addiction and act as a post-transcriptional regulator of gene expression. We previously reported extensive downregulation of miRNAs in the nucleus accumbens (NAc) of methamphetamine (METH)-sensitized mice. However, the regulatory mechanism of this METH-induced downregulation of miRNAs has yet to be elucidated. Thus, we examined METH-induced changes in the expression of miRNAs and their precursors, as well as the expression levels of mRNA and the proteins involved in miRNA biogenesis such as Dicer1 and Ago2, in the nucleus accumbens of METH-induced locomotor sensitized mice...
March 8, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29504647/enhanced-neuronal-and-blunted-hemodynamic-reactivity-to-cocaine-in-the-prefrontal-cortex-following-extended-cocaine-access-optical-imaging-study-in-anesthetized-rats
#17
Craig P Allen, Kicheon Park, Ang Li, Nora D Volkow, George F Koob, Yingtian Pan, Xiu-Ti Hu, Congwu Du
Cocaine addiction is associated with dysfunction of the prefrontal cortex (PFC), which facilitates relapse and compulsive drug taking. To assess if cocaine's effects on both neuronal and vascular activity contribute to PFC dysfunction, we used optical coherence tomography and multi-wavelength laser speckle to measure vascularization and hemodynamics and used GCaMP6f to monitor intracellular Ca2+ levels ([Ca2+ ]in ) as a marker of neuronal activity. Rats were given short (1 hour; ShA) or long (6 hours; LgA) access cocaine self-administration...
March 5, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29498170/pharmacogenetics-of-dopamine-%C3%AE-hydroxylase-in-cocaine-dependence-therapy-with-doxazosin
#18
Xuefeng Zhang, David A Nielsen, Coreen B Domingo, Daryl I Shorter, Ellen M Nielsen, Thomas R Kosten
The α1 -adrenergic antagonist, doxazosin, has improved cocaine use disorder (CUD) presumably by blocking norepinephrine (NE) stimulation and reward from cocaine-induced NE increases. If the NE levels for release were lower, then doxazosin might more readily block this NE stimulation and be more effective. The NE available for release can be lower through a genetic polymorphism in dopamine β-hydroxylase (DBH) (C-1021T, rs1611115), which reduces DβH's conversion of dopamine to NE. We hypothesize that doxazosin would be more effective in CUD patients who have these genetically lower DβH levels...
March 2, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29498158/preclinical-evidence-for-combining-the-5-ht-2c-receptor-agonist-lorcaserin-and-varenicline-as-a-treatment-for-nicotine-dependence
#19
Paul J Fletcher, Zhaoxia Li, Leo B Silenieks, Cam MacMillan, Ines DeLannoy, Guy A Higgins
Varenicline, a nicotinic acetylcholine receptor partial agonist, is used to treat nicotine dependence. Lorcaserin, a 5-HT2C receptor agonist has been approved in some countries to treat obesity. Based on preclinical and preliminary clinical evidence, lorcaserin may have potential to treat nicotine dependence. These experiments examined in rats the effects of combining varenicline (0.5 or 1 mg/kg) and lorcaserin (0.3, 0.6 and 1 mg/kg) on nicotine self-administration, reinstatement of nicotine seeking, responding for food and impulsive action...
March 2, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29480646/the-monoamine-stabilizer-osu6162-prevents-the-alcohol-deprivation-effect-and-improves-motor-impulsive-behavior-in-rats
#20
Ida Fredriksson, Malin Wirf, Pia Steensland
Alcohol craving, in combination with impaired impulse control, often leads to relapse. The dopamine system mediates the rewarding properties of alcohol but is also involved in regulating impulsive behavior. The monoamine stabilizer (-)-OSU6162 (OSU6162) has the ability to stabilize dopamine activity depending on the prevailing dopaminergic tone and may therefore normalize the dopaminergic transmission regulating both alcohol use disorder and impulsivity. We have recently showed that OSU6162 attenuates voluntary alcohol consumption, operant alcohol self-administration, alcohol withdrawal symptoms and cue-induced reinstatement of alcohol seeking in rats...
February 26, 2018: Addiction Biology
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