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Reward Pathway

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https://www.readbyqxmd.com/read/28324454/reward-circuitry-in-addiction
#1
REVIEW
Sarah Cooper, A J Robison, Michelle S Mazei-Robison
Understanding the brain circuitry that underlies reward is critical to improve treatment for many common health issues, including obesity, depression, and addiction. Here we focus on insights into the organization and function of reward circuitry and its synaptic and structural adaptations in response to cocaine exposure. While the importance of certain circuits, such as the mesocorticolimbic dopamine pathway, are well established in drug reward, recent studies using genetics-based tools have revealed functional changes throughout the reward circuitry that contribute to different facets of addiction, such as relapse and craving...
March 21, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28314439/reversing-the-atypical-valuation-of-drug-and-nondrug-rewards-in-smokers-using-multimodal-neuroimaging
#2
Travis E Baker, Paul Lesperance, Alan Tucholka, Stephane Potvin, Kevin Larcher, Yu Zhang, Didier Jutras-Aswad, Patricia Conrod
BACKGROUND: Chronic substance use can disrupt the reward function of the anterior cingulate cortex (ACC), biasing the ACC to favor goal-directed behaviors that converge on drug use. Here we used multimodal neuroimaging methods to ask whether modulating reward-related signaling in the ACC can reverse the atypical valuation of nondrug and drug rewards in abstinent smokers. METHODS: We first recorded functional magnetic resonance imaging data from 20 moderately dependent cigarette smokers (mean age = 25 years; no history of neuropsychiatric disorders), following an overnight period of abstinence, to identify regions of the left dorsal lateral prefrontal cortex associated with the anticipation of drug-related rewards (cigarette puff)...
January 27, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28314229/how-did-the-good-school-toolkit-reduce-the-risk-of-past-week-physical-violence-from-teachers-to-students-qualitative-findings-on-pathways-of-change-in-schools-in-luwero-uganda
#3
N Kyegombe, S Namakula, J Mulindwa, J Lwanyaaga, D Naker, S Namy, J Nakuti, J Parkes, L Knight, E Walakira, K M Devries
Violence against children is a serious violation of children's rights with significant impacts on current and future health and well-being. The Good School Toolkit (GST) is designed to prevent violence against children in primary schools through changing schools' operational cultures. Conducted in the Luwero District in Uganda between 2012 and 2014, findings from previous research indicate that the Toolkit reduced the odds of past week physical violence from school staff (OR = 0.40, 95%CI 0.26-0.64, p < 0...
March 7, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28302862/arresting-the-development-of-addiction-the-role-of-%C3%AE-arrestin2-in-drug-abuse
#4
Kirsten A Porter-Stransky, David Weinshenker
The protein β-arrestin2 (βarr2) directly interacts with receptors and signaling pathways that mediate the behavioral effects of drugs of abuse, making it a prime candidate for therapeutic interventions. βarr2 drives desensitization and internalization of G protein-coupled receptors, including dopamine, opioid, and cannabinoid receptors, and can also trigger G protein-independent intracellular signaling. βarr2 mediates several drug-induced behaviors, but the relationship is complex and dependent on the type of behavior (e...
March 16, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28295296/anterior-and-posterior-parts-of-the-rat-ventral-tegmental-area-and-the-rostromedial-tegmental-nucleus-receive-topographically-distinct-afferents-from-the-lateral-habenular-complex
#5
Anja Petzel, René Bernard, Wolfram C Poller, Rüdiger W Veh
That activation of the reward system involves increased activity of dopaminergic (DA) neurons in the ventral tegmental area (VTA) is widely accepted. In contrast, the lateral habenular complex (LHb), which is known as the center of the anti-reward system, directly and indirectly inhibits DA neurons in the VTA. The VTA, however, is not a homogenous entity with major functional differences between its anterior (aVTA) and posterior (pVTA) regions. It is not precisely known, whether habenular input to the aVTA, pVTA, and the newly recognized rostromedial tegmental nucleus (RMTg) are similarily or differently organized...
March 10, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28292629/the-5-clinical-pillars-of-value-for-total-joint-arthroplasty-in-a-bundled-payment-paradigm
#6
Kelvin Kim, Richard Iorio
BACKGROUND: Our large, urban, tertiary, university-based institution reflects on its 4-year experience with Bundled Payments for Care Improvement. We will describe the importance of 5 clinical pillars that have contributed to the early success of our bundled payment initiative. We are convinced that value-based care delivered through bundled payment initiatives is the best method to optimize patient outcomes while rewarding surgeons and hospitals for adapting to the evolving healthcare reforms...
February 14, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28285241/neural-reactivity-to-reward-in-school-age-offspring-of-depressed-mothers
#7
Jillian Lee Wiggins, Karen T G Schwartz, Maria Kryza-Lacombe, Philip A Spechler, Sarah L Blankenship, Lea Dougherty
BACKGROUND: Identifying neural profiles predictive of future psychopathology in at-risk individuals is important to efficiently direct preventive care. Alterations in reward processing may be a risk factor for depression. The current study characterized neural substrates of reward processing in children at low- and high-risk for psychopathology due to maternal depression status. METHODS: Children with (n=27) and without (n=19) maternal depression (ages 5.9-9.6 years) performed a monetary incentive delay task in which they received rewards, if they successfully hit a target, or no reward regardless of performance, during fMRI acquisition...
March 7, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28284949/inhibition-of-wnt-signalling-dose-dependently-impairs-the-acquisition-and-expression-of-amphetamine-induced-conditioned-place-preference
#8
Farhana Islam, Kathleen Xu, Richard J Beninger
The mechanisms by which dopaminergic neurotransmission in the nucleus accumbens (NAc) is involved in incentive learning produced by rewarding stimuli remain unclear. Recently, Wnt signalling has been implicated in synaptic plasticity and learning and memory. Functional interactions between Wnt and dopamine (DA) signalling has been demonstrated using in vitro and tissue physiology approaches, however there remains a lack of in vivo research into the involvement of Wnt in DA-mediated learning in behaving animals...
March 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28284947/behavioral-characterization-of-blocking-the-erbb-signaling-during-adolescent-and-adulthood-in-reward-liking-preference-and-reward-related-learning
#9
Hagar Tadmor, Idit Golani, Eshkar Dvir, Ilana Kremer, Alon Shamir
Adolescence is a critical period in brain development. During this critical period the seeking for hedonic activities is increased, and their activity signals are stronger than the regulatory signals of judgment and reasoning. We recently reported that alteration of ErbB signaling during this period led to elevated striatal dopamine levels and reduced preference for sweetness without affecting locomotor activity and exploratory behavior. In the current study, we extend our findings and explore whether inhibition of the ErbB pathway during adolescence or adulthood also affects alcohol preference (hedonic "liking"), avoidance learning, and motivational reward "wanting"...
March 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28284776/neural-underpinnings-of-prosexual-effects-induced-by-gamma-hydroxybutyrate-in-healthy-male-humans
#10
Oliver G Bosch, Michael M Havranek, Andrea Baumberger, Katrin H Preller, Robin von Rotz, Marcus Herdener, Rainer Kraehenmann, Philipp Staempfli, Milan Scheidegger, Tim Klucken, Erich Seifritz, Boris B Quednow
Gamma-hydroxybutyrate (GHB) is a GHB-/GABAB-receptor agonist currently used as treatment for narcolepsy but also as a drug of abuse. Non-medical GHB users have repeatedly reported prosexual effects including libido-enhancement and lowering of attractiveness standards for partner selection. Here, we examined the putative prosexual effects of oral GHB in healthy males in two experiments both employing randomized, placebo-controlled, double-blind, balanced, and cross-over study designs. In experiment I, subjective effects of 20 and 35mg/kg GHB vs...
March 8, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28283563/a-rapid-subcortical-amygdala-route-for-faces-irrespective-of-spatial-frequency-and-emotion
#11
Jessica McFadyen, Martial Mermillod, Jason B Mattingley, Veronika Halász, Marta I Garrido
There is significant controversy over the existence and function of a direct subcortical visual pathway to the amygdala. It is thought that this pathway rapidly transmits low spatial frequency information to the amygdala independently of the cortex and yet the directionality of this function has never been determined. We used magnetoencephalography to measure neural activity while human participants discriminated the gender of neutral and fearful faces filtered for low or high spatial frequencies. We applied dynamic causal modelling to demonstrate that the most likely underlying neural network consisted of a pulvinar-amygdala connection that was uninfluenced by spatial frequency or emotion, and a cortical-amygdala connection that conveyed high spatial frequencies...
March 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28283562/effort-based-reinforcement-processing-and-functional-connectivity-underlying-amotivation-in-medicated-patients-with-depression-and-schizophrenia
#12
Ho Il Park, Boung Chul Lee, Jae-Jin Kim, Joong Il Kim, Min-Seung Koo
Amotivation is a common phenotype of major depressive disorder and schizophrenia which are clinically distinct disorders. Effective treatment targets and strategies can be discovered by examining the dopaminergic reward network function underlying amotivation between these disorders. We conducted a functional MRI study in healthy human participants and medicated patients with depression and schizophrenia using an effort-based reinforcement task. We examined regional activations related to reward type (positive and negative reinforcement), effort level, and their composite value as well as resting-state functional connectivities within the meso-striatal-prefrontal pathway...
March 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28283558/gene-expression-profiling-with-cre-conditional-pseudorabies-virus-reveals-a-subset-of-midbrain-neurons-that-participate-in-reward-circuitry
#13
Lisa E Pomeranz, Mats I Ekstrand, Kaamashri N Latcha, Gregory A Smith, Lynn W Enquist, Jeffrey M Friedman
The mesolimbic dopamine pathway receives inputs from numerous regions of the brain as part of a neural system that detects rewarding stimuli and coordinates a behavioral response. The capacity to simultaneously map and molecularly define the components of this complex multisynaptic circuit would thus advance our understanding of the determinants of motivated behavior. To accomplish this, we have constructed pseudorabies virus (PRV) strains in which viral propagation and fluorophore expression are activated only after exposure to Cre recombinase...
March 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28280461/glutamate-and-opioid-antagonists-modulate-dopamine-levels-evoked-by-innately-attractive-male-chemosignals-in-the-nucleus-accumbens-of-female-rats
#14
María-José Sánchez-Catalán, Alejandro Orrico, Lucía Hipólito, Teodoro Zornoza, Ana Polache, Enrique Lanuza, Fernando Martínez-García, Luis Granero, Carmen Agustín-Pavón
Sexual chemosignals detected by vomeronasal and olfactory systems mediate intersexual attraction in rodents, and act as a natural reinforcer to them. The mesolimbic pathway processes natural rewards, and the nucleus accumbens receives olfactory information via glutamatergic projections from the amygdala. Thus, the aim of this study was to investigate the involvement of the mesolimbic pathway in the attraction toward sexual chemosignals. Our data show that female rats with no previous experience with males or their chemosignals display an innate preference for male-soiled bedding...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28271452/testing-the-dual-pathway-model-of-adhd-in-obesity-a-pilot-study
#15
Saskia Van der Oord, Caroline Braet, Samuele Cortese, Laurence Claes
INTRODUCTION: There may be shared neuropsychological dysfunctions in ADHD and obesity. This study tested a neuropsychological model of ADHD (reward/executive dysfunctioning) in individuals with obesity. Furthermore, the association between co-morbid binge eating and reward/executive dysfunction was explored. METHODS: Reward/executive dysfunctioning was assessed using both neuropsychological measures and questionnaires in individuals (aged 17-68) with obesity (N = 39; mean BMI = 39...
March 7, 2017: Eating and Weight Disorders: EWD
https://www.readbyqxmd.com/read/28269579/development-of-semi-chronic-microdrive-system-for-large-scale-circuit-mapping-in-macaque-mesolimbic-and-basal-ganglia-systems
#16
Shaoyu Qiao, Kevin A Brown, Amy L Orsborn, Breonna Ferrentino, Bijan Pesaran
The development of novel neurotechnologies for treating refractory neuropsychiatry disorders depends on understanding and manipulating the dynamics of neural circuits across large-scale brain networks. The mesolimbic pathway plays an essential role in reward processing and mood regulation and disorders of this pathway underlie many neuropsychiatric disorders. Here, we present the design of a customized semi-chronic microdrive array that precisely targets the anatomical structures of non-human primate (NHP) mesolimbic and basal ganglia systems...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28263413/species-specific-diversity-in-the-anatomical-and-physiological-organization-of-the-bnst-vta-pathway
#17
Jennifer Kaufling, Delphine Girard, Marlène Maitre, Thierry Leste-Lasserre, François Georges
The anteromedial part of the bed nucleus of the stria terminalis (amBNST) is a limbic structure innervating the ventral tegmental area (VTA) that is remarkably constant across species. The amBNST modulates fear and anxiety, and activation of VTA dopamine (DA) neurons by amBNST afferents seems to be the way by which stress controls motivational states associated with reward or aversion. Because fear learning and anxiety states can be expressed differently between rats and mice, we compared the functional connectivity between amBNST and the VTA-DA neurons in both species using consistant methodological approaches...
March 6, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28257759/blockade-of-trkb-receptors-in-the-nucleus-accumbens-prior-to-heterotypic-stress-alters-corticotropin-releasing-hormone-crh-vesicular-glutamate-transporter-2-vglut2-and-glucocorticoid-receptor-gr-within-the-mesolimbic-pathway
#18
Idu Azogu, Helene Plamondon
Inhibition of stress-induced elevations in brain-derived neurotrophic factor (BDNF) or its primary receptor tyrosine-related kinase B (TrkB) within the reward pathway may modulate vulnerability to anxiety and mood disorders. The current study examined the role of BDNF/TrkB signaling on biochemistry and behavior under basal conditions and following exposure to a 10-day heterotypic stress paradigm in male rats. Effects of intra-accumbal administration of TrkB antagonist ANA-12 (0.25μg/0.5μl/min) on anxiety, and expression of Trk-B, corticotropin-releasing hormone (CRH), vesicular glutamate transporter 2 (vGluT2) and glucocorticoid receptor (GR) within the mesolimbic pathway were determined...
March 14, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28254363/the-human-globus-pallidus-internus-is-sensitive-to-rewards-evidence-from-intracerebral-recordings
#19
Thomas F Münte, Josep Marco-Pallares, Seza Bolat, Marcus Heldmann, Götz Lütjens, Wido Nager, Kirsten Müller-Vahl, Joachim K Krauss
BACKGROUND: The globus pallidus internus (GPi) is the final output relay of the basal ganglia for the control of movements but has also been shown to belong to a second pathway projecting to the lateral habenula. This latter pathway is related to reward processing. METHOD: This prompted us to record, in eight patients receiving deep brain stimulation of the GPi for the alleviation of various movement disorders, local field potentials (LFP) while these patients performed a lottery task...
February 14, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28251297/glutamate-carboxypeptidase-ii-gcpii-inhibitor-2-pmpa-reduces-rewarding-effects-of-the-synthetic-cathinone-mdpv-in-rats-a-role-for-n-acetylaspartylglutamate-naag
#20
Callum Hicks, Ryan A Gregg, Sunil U Nayak, Lee Anne Cannella, Giana J Schena, Christopher S Tallarida, Allen B Reitz, Garry R Smith, Scott M Rawls
RATIONALE: Metabotropic glutamate 2 and 3 (mGluR2/3) receptors are implicated in drug addiction as they limit excessive glutamate release during relapse. N-acetylaspartylglutamate (NAAG) is an endogenous mGluR2/3 agonist that is inactivated by the glutamate carboxypeptidase II (GCPII) enzyme. GCPII inhibitors, and NAAG itself, attenuate cocaine-seeking behaviors. However, their effects on the synthetic cathinone 3,4-methylenedioxypyrovalerone (MDPV) have not been examined. OBJECTIVES: We determined whether withdrawal following repeated MDPV administration alters GCPII expression in corticolimbic regions...
March 1, 2017: Psychopharmacology
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