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https://www.readbyqxmd.com/read/28716608/opioidergic-and-dopaminergic-modulation-of-cost-benefit-decision-making-in-long-evans-rats
#1
Ileana Morales, Paul J Currie, Timothy D Hackenberg, Raúl Pastor
Eating disorders are associated with impaired decision-making and dysfunctional reward-related neurochemistry. The present study examined the potential contributions of dopamine and opioid signaling to these processes using two different decision-making tasks. In one task, Long Evans Rats chose between working for a preferred food (high-carbohydrate banana-flavored sucrose pellets) by lever pressing on a progressive-ratio schedule of reinforcement vs. obtaining less preferred laboratory chow that was concurrently available...
July 14, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28716096/optimizing-reproducibility-of-operant-testing-through-reinforcer-standardization-identification-of-key-nutritional-constituents-determining-reward-strength-in-touchscreens
#2
Eun Woo Kim, Benjamin U Phillips, Christopher J Heath, So Yeon Cho, Hyunjeong Kim, Jemeen Sreedharan, Ho-Taek Song, Jong Eun Lee, Timothy J Bussey, Chul Hoon Kim, Eosu Kim, Lisa M Saksida
Reliable and reproducible assessment of animal learning and behavior is a central aim of basic and translational neuroscience research. Recent developments in automated operant chamber technology have led to the possibility of universal standard protocols, in addition to increased translational potential, reliability and accuracy. However, the impact of regional and national differences in the supplies of available reinforcers in this system on behavioural performance and inter-laboratory variability is an unknown and at present uncontrolled variable...
July 17, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28711521/a-comparison-of-resetting-and-nonresetting-contingencies-in-progressive-duration-schedules
#3
Morgan Valois, Sara Peck, Tom Byrne
We compared two progressive schedules of reinforcement in which rats received access to sweetened condensed milk for depressing and holding down a response lever. Duration requirements increased after each reinforcer delivery in a manner similar to progressive-ratio schedules. Under one schedule, any response duration less than that required for reinforcement had no programmed consequences. Under the second schedule, the cumulative duration of all responses could meet the reinforcement criteria. Breaking points were consistently higher when all lever presses, regardless of duration, contributed to meeting the reinforcer requirements...
July 12, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28679148/intermittent-access-to-ethanol-drinking-facilitates-the-transition-to-excessive-drinking-after-chronic-intermittent-ethanol-vapor-exposure
#4
Adam Kimbrough, Sarah Kim, Maury Cole, Molly Brennan, Olivier George
BACKGROUND: Alcohol binge drinking in humans is thought to increase the risk for alcohol use disorder (AUD). Unclear is whether drinking patterns (e.g., bingelike or stable drinking) differentially affect the transition to compulsive-like drinking in dependent individuals. We examined whether chronic bingelike drinking facilitates the transition to compulsive-like drinking in rats. METHODS: Male Wistar rats were given 5 months of intermittent access to ethanol (EtOH) (IAE) or continuous access to EtOH (CAE) in a 2-bottle choice paradigm...
July 5, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28677665/reinforcing-effects-of-binary-mixtures-of-common-bath-salts-constituents-studies-with-3-4-methylenedioxypyrovalerone-mdpv-3-4-methylenedioxymethcathinone-methylone-and-caffeine-in-rats
#5
Brenda M Gannon, Kayla I Galindo, Melson P Mesmin, Kenner C Rice, Gregory T Collins
Bath salts use is associated with high rates of abuse, toxicity, and death. Bath salts preparations often contain mixtures of drugs including multiple synthetic cathinones (eg, 3,4-methylenedioxypyrovalerone [MDPV] or 3,4-methylenedioxymethcathinone [methylone]) or synthetic cathinones and caffeine; however, little is known about whether interactions among bath salts constituents contribute to the abuse-related effects of bath salts preparations. This study used male Sprague Dawley rats responding under a progressive ratio schedule to quantify the reinforcing effectiveness of MDPV, methylone, and caffeine, administered alone and as binary mixtures (n=12 per mixture)...
July 5, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28673753/relationship-between-effortful-motivation-and-neurocognition-in-schizophrenia
#6
Andrew W Bismark, Michael L Thomas, Melissa Tarasenko, Alexandra L Shiluk, Sonia Y Rackelmann, Jared W Young, Gregory A Light
Effortful motivation and reward valuation learning deficits are associated with negative symptoms and impaired cognition in schizophrenia (SZ) patients. Whereas clinical assessments of motivation and reward value typically rely upon clinician ratings or self-report scales, behavioral measures often confound these constructs. Simple reverse-translated behavioral tasks that independently quantify motivation and reward valuation-which could then be linked to cognition-may facilitate the development of pro-cognitive therapeutics by bridging the "preclinical-to-clinical" gap...
June 30, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28663114/palatable-food-self-administration-and-reinstatement-are-not-affected-by-dual-orexin-receptor-antagonism
#7
Shaun Yon-Seng Khoo, Kelly J Clemens, Gavan P McNally
The orexins are widely regarded potential therapeutic targets for a range of disorders of appetitive motivation, including obesity. The motivational activator theory, the first coherent account of the orexin system's role in appetitive motivation, predicts that orexin release motivates appetitive behaviour when the reinforcer is highly salient, available under a high unit-cost or when reward seeking is cue-driven. The present study tested the effect of intracerebroventricular (i.c.v.) administration of the highly potent and commercially available dual orexin receptor antagonist, TCS 1102, on self-administration and reinstatement of palatable food seeking in hungry and sated rats...
June 26, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28614590/chronic-ethanol-during-adolescence-impacts-corticolimbic-dendritic-spines-and-behavior
#8
Nicholas J Jury, Gabrielle A Pollack, Meredith J Ward, Jessica L Bezek, Alexandra J Ng, Courtney R Pinard, Hadley C Bergstrom, Andrew Holmes
BACKGROUND: Risk for alcohol use disorders (AUDs) in adulthood is linked to alcohol drinking during adolescence, but understanding of the neural and behavioral consequences of alcohol exposure during adolescence remains incomplete. Here, we examined the neurobehavioral impact of adolescent chronic intermittent EtOH (CIE) vapor exposure in mice. METHODS: C57BL/6J-background Thy1-EGFP mice were CIE-exposed during adolescence or adulthood and examined, as adults, for alterations in the density and morphology of dendritic spines in infralimbic (IL) cortex, prelimbic (PL) cortex, and basolateral amygdala (BLA)...
July 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28584929/steep-effort-discounting-of-a-preferred-reward-over-a-freely-available-option-in-prolonged-methamphetamine-withdrawal-in-male-rats
#9
Andrew B Thompson, Julian Gerson, Alexandra Stolyarova, Amador Bugarin, Evan E Hart, J David Jentsch, Alicia Izquierdo
RATIONALE: Drug addiction can be described as aberrant allocation of effort toward acquiring drug, despite associated costs. It is unclear if this behavioral pattern results from an overvaluation of reward or to an altered sensitivity to costs. OBJECTIVE: Present experiments assessed reward sensitivity and effortful choice in rats following 1 week of withdrawal from methamphetamine (mAMPH). METHODS: Rats were treated with either saline or an escalating dose mAMPH regimen, then tested after a week without the drug...
June 6, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28570297/reinforcing-effects-of-abused-bath-salts-constituents-3-4-methylenedioxypyrovalerone-and-%C3%AE-pyrrolidinopentiophenone-and-their-enantiomers
#10
Brenda M Gannon, Kenner C Rice, Gregory T Collins
Synthetic cathinones found in abused 'bath salts' preparations are chiral molecules. Racemic 3,4-methylenedioxypyrovalerone (MDPV) and α-pyrrolidinopentiophenone (α-PVP) are two common constituents of these preparations that have been reported to be highly effective reinforcers; however, the relative contribution of each enantiomer toward these effects has not been determined. Thus, male Sprague-Dawley rats were trained to respond for racemic MDPV or α-PVP (n=9/drug), with full dose-response curves for the racemate and the S and R enantiomers of MDPV and α-PVP generated under a progressive ratio schedule of reinforcement...
May 31, 2017: Behavioural Pharmacology
https://www.readbyqxmd.com/read/28567699/effects-of-nalfurafine-on-the-reinforcing-thermal-antinociceptive-and-respiratory-depressant-effects-of-oxycodone-modeling-an-abuse-deterrent-opioid-analgesic-in-rats
#11
E Andrew Townsend, Jennifer E Naylor, S Stevens Negus, Shelley R Edwards, Hina N Qureshi, Hunter W McLendon, Christopher R McCurdy, Coco N Kapanda, Jussara M do Carmo, Fernanda S da Silva, John E Hall, Kenneth J Sufka, Kevin B Freeman
RATIONALE: Strategies to reduce the misuse of mu opioid agonists are critically needed. Previous work has shown that kappa opioid agonists can diminish the abuse-related effects and augment the antinociceptive effects of mu agonists. However, use of traditional kappa agonists is limited by their dysphoric side effects. OBJECTIVES: The current study examined the effects of nalfurafine, a clinically available atypical kappa agonist, on the reinforcing, thermal antinociceptive, and respiratory-depressant effects of oxycodone in male rats...
May 31, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28543944/anterior-cingulate-cortex-supports-effort-allocation-towards-a-qualitatively-preferred-option
#12
Evan E Hart, Julian O Gerson, Yael Zoken, Marisella Garcia, Alicia Izquierdo
The anterior cingulate cortex (ACC) is known to be involved in effortful choice, yet its role in cost-benefit evaluation of qualitatively different rewards (more/less preferred), beyond magnitude differences (larger/smaller), is poorly understood. Selecting between qualitatively different options is a decision type commonly faced by humans. Here, we assessed the role of ACC on a task that has primarily been used to probe striatal function in motivation. Rats were trained to stable performance on a progressive ratio schedule for sucrose pellets and were then given sham surgeries (control) or excitotoxic NMDA lesions of ACC...
May 20, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28536867/suppressing-effect-of-cor659-on-alcohol-sucrose-and-chocolate-self-administration-in-rats-involvement-of-the-gabab-and-cannabinoid-cb1-receptors
#13
Paola Maccioni, Giancarlo Colombo, Irene Lorrai, Alessandro Zaru, Mauro A M Carai, Gian Luigi Gessa, Antonella Brizzi, Claudia Mugnaini, Federico Corelli
RATIONALE AND OBJECTIVES: COR659 [methyl2-(4-chlorophenylcarboxamido)-4-ethyl-5-methylthiophene-3-carboxylate] is a new, positive allosteric modulator (PAM) of the GABAB receptor. This study evaluated whether COR659 shared with previously tested GABAB PAMs the capacity to reduce alcohol self-administration in rats. RESULTS: Treatment with non-sedative doses of COR659 (2.5, 5, and 10 mg/kg; i.p.) suppressed lever-responding for alcohol (15% v/v) in Sardinian alcohol-preferring (sP) rats under the fixed ratio (FR) 4 (FR4) and progressive ratio (PR) schedules of reinforcement; COR659 was more potent and effective than the reference GABAB PAM, GS39783...
May 24, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28534263/n-acetylaspartylglutamate-inhibits-heroin-self-administration-and-heroin-seeking-behaviors-induced-by-cue-or-priming-in-rats
#14
Huaqiang Zhu, Miaojun Lai, Weisheng Chen, Disen Mei, Fuqiang Zhang, Huifeng Liu, Wenhua Zhou
Activation of presynaptic group II metabotropic glutamate receptors (mGluR2/3) inhibits drug reward and drug-seeking behavior, but the role of N-acetylaspartylglutamate (NAAG), an agonist of endogenous mGluR2/3, in heroin reward and heroin-seeking behavior remained unclear. Here, we aimed to explore the effects of exogenous NAAG on heroin self-administration and heroin-seeking behavior. First, rats were trained to self-administer heroin under a fixed ratio 1 (FR1) schedule for 10 days, then received NAAG (50 or 100 μg/10 μL in each nostril) in the absence or presence of LY341495 (1 mg/kg, i...
May 22, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28497655/nicotine-self-administration-reverses-cognitive-deficits-in-a-rat-model-for-schizophrenia
#15
Uta Waterhouse, Katharine A Brennan, Bart A Ellenbroek
High comorbidity between schizophrenia and tobacco addiction has been well established. Explanatory theories include nicotine as a cognitive enhancer ameliorating symptoms of schizophrenia and underlying shared substrates increasing susceptibility to addiction in these individuals. To test these non-mutually exclusive theories, the maternal immune activation (MIA) model was utilized. To this end, pregnant Sprague Dawley rats were subcutaneously injected with a bacterial endotoxin, lipopolysaccharide (0.5 mg/kg), on gestation days 10 and 11...
May 12, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28444326/preclinical-evidence-that-5-ht1b-receptor-agonists-show-promise-as-medications-for-psychostimulant-use-disorders
#16
Raul Garcia, Austin R Cotter, Kenneth Leslie, M Foster Olive, Janet L Neisewander
Background: 5-HT1B receptor (5-HT1BR) agonists enhance cocaine intake during daily self-administration sessions, but decrease cocaine intake when tested after prolonged abstinence. We examined if 5-HT1BR agonists produce similar abstinence-dependent effects on methamphetamine intake. Methods: Male rats were trained to self-administer methamphetamine (0.1 mg/kg, IV) on low (FR5 and VR5) and high (progressive ratio; PR) effort schedules of reinforcement until intake was stable...
April 22, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28434654/compulsive-addiction-like-aggressive-behavior-in-mice
#17
Sam A Golden, Conor Heins, Marco Venniro, Daniele Caprioli, Michelle Zhang, David H Epstein, Yavin Shaham
BACKGROUND: Some people are highly motivated to seek aggressive encounters, and among those who have been incarcerated for such behavior, recidivism rates are high. These observations echo two core features of drug addiction: high motivation to seek addictive substances, despite adverse consequences, and high relapse rates. Here we used established rodent models of drug addiction to determine whether they would be sensitive to "addiction-like" features of aggression in CD-1 mice. METHODS: In experiments 1 and 2, we trained older CD-1 mice to lever press for opportunities to attack younger C57BL6/J mice...
March 17, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28433467/modeling-hypohedonia-following-repeated-social-defeat-individual-vulnerability-and-dopaminergic-involvement
#18
Samantha R Spierling, Maegan Mattock, Eric P Zorrilla
Social defeat in rodents putatively can model hypohedonia. The present studies examined models for assessing hypohedonia-like behavior and tested the hypotheses that 1) individual differences in baseline reward sensitivity predict vulnerability, and 2) defeat elicits changes in pharmacological measures of striatal dopaminergic function. Male Wistar rats (n=142) received repeated defeat (3 "triad" blocks of 3 defeats) or control handling. To determine whether defeat influenced consumption of SuperSac (glucose-saccharin) over an isocaloric, less preferred, glucose solution, a 2-choice paradigm was used...
April 19, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28429835/levodopa-prevents-the-reinstatement-of-cocaine-self-administration-in-rats-via-potentiation-of-dopamine-release-in-the-medial-prefrontal-cortex
#19
Silvia Antinori, Liana Fattore, Pierluigi Saba, Walter Fratta, Gian Luigi Gessa, Paola Devoto
Dopamine agonists have been proposed as therapeutic tools for cocaine addiction. We have recently demonstrated that indirect dopamine agonists, including levodopa (L-DOPA), markedly increase cocaine-induced dopamine release in the medial prefrontal cortex (mPFC) of rats leading to the suppression of cocaine-seeking behavior. This study was aimed to understand the behavioral and neurochemical effects of L-DOPA on cocaine-taking and cocaine-seeking in rats. After reaching a stable pattern of intravenous cocaine self-administration under a continuous fixed ratio (FR-1) schedule of reinforcement, male rats were treated with L-DOPA at different steps of the self-administration protocol...
April 21, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28419649/a-paradigm-for-examining-stress-effects-on-alcohol-motivated-behaviors-in-participants-with-alcohol-use-disorder
#20
Mary E McCaul, Gary S Wand, Elise M Weerts, Xiaoqiang Xu
Although epidemiological research has shown an increase in drinking following stressors and trauma, limited paradigms have been validated to study the relationship between stress and drinking in the human laboratory. The current study developed a progressive ratio (PR) operant procedure to examine the effects of psychosocial stress on alcohol craving and several alcohol-motivated behaviors in persons with alcohol use disorder. Current heavy, nontreatment-seeking drinkers (N = 30) were media-recruited and completed a comprehensive assessment of recent drinking, mood and health...
April 17, 2017: Addiction Biology
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