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Reward Pathway

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https://www.readbyqxmd.com/read/28418642/structure-and-dynamics-of-individual-diastereomeric-complexes-on-platinum-surface-studies-related-to-heterogeneous-enantioselective-catalysis
#1
Yi Dong, Guillaume Goubert, Michael N Groves, Jean-Christian Lemay, Bjørk Hammer, Peter H McBreen
The modification of heterogeneous catalysts through the chemisorption of chiral molecules is a method to create catalytic sites for enantioselective surface reactions. The chiral molecule is called a chiral modifier by analogy to the terms chiral auxiliary or chiral ligand used in homogeneous asymmetric catalysis. While there has been progress in understanding how chirality transfer occurs, the intrinsic difficulties in determining enantioselective reaction mechanisms are compounded by the multisite nature of heterogeneous catalysts and by the challenges facing stereospecific surface analysis...
April 18, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28418404/a-pathway-linking-reward-circuitry-impulsive-sensation-seeking-and-risky-decision-making-in-young-adults-identifying-neural-markers-for-new-interventions
#2
H W Chase, J C Fournier, M A Bertocci, T Greenberg, H Aslam, R Stiffler, J Lockovich, S Graur, G Bebko, E E Forbes, M L Phillips
High trait impulsive sensation seeking (ISS) is common in 18-25-year olds, and is associated with risky decision-making and deleterious outcomes. We examined relationships among: activity in reward regions previously associated with ISS during an ISS-relevant context, uncertain reward expectancy (RE), using fMRI; ISS impulsivity and sensation-seeking subcomponents; and risky decision-making in 100, transdiagnostically recruited 18-25-year olds. ISS, anhedonia, anxiety, depression and mania were measured using self-report scales; clinician-administered scales also assessed the latter four...
April 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28413776/dissociable-neural-processes-during-risky-decision-making-in-individuals-with-internet-gaming-disorder
#3
Lu Liu, Gui Xue, Marc N Potenza, Jin-Tao Zhang, Yuan-Wei Yao, Cui-Cui Xia, Jing Lan, Shan-Shan Ma, Xiao-Yi Fang
Risk-taking is purported to be central to addictive behaviors. However, for Internet gaming disorder (IGD), a condition conceptualized as a behavioral addiction, the neural processes underlying impaired decision-making (risk evaluation and outcome processing) related to gains and losses have not been systematically investigated. Forty-one males with IGD and 27 healthy comparison (HC) male participants were recruited, and the cups task was used to identify neural processes associated with gain- and loss-related risk- and outcome-processing in IGD...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28408878/reward-based-motor-adaptation-mediated-by-basal-ganglia
#4
Taegyo Kim, Khaldoun C Hamade, Dmitry Todorov, William H Barnett, Robert A Capps, Elizaveta M Latash, Sergey N Markin, Ilya A Rybak, Yaroslav I Molkov
It is widely accepted that the basal ganglia (BG) play a key role in action selection and reinforcement learning. However, despite considerable number of studies, the BG architecture and function are not completely understood. Action selection and reinforcement learning are facilitated by the activity of dopaminergic neurons, which encode reward prediction errors when reward outcomes are higher or lower than expected. The BG are thought to select proper motor responses by gating appropriate actions, and suppressing inappropriate ones...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28398233/therapeutic-potential-of-targeting-the-ghrelin-pathway
#5
REVIEW
Gustav Colldén, Matthias H Tschöp, Timo D Müller
Ghrelin was discovered in 1999 as the endogenous ligand of the growth-hormone secretagogue receptor 1a (GHSR1a). Since then, ghrelin has been found to exert a plethora of physiological effects that go far beyond its initial characterization as a growth hormone (GH) secretagogue. Among the numerous well-established effects of ghrelin are the stimulation of appetite and lipid accumulation, the modulation of immunity and inflammation, the stimulation of gastric motility, the improvement of cardiac performance, the modulation of stress, anxiety, taste sensation and reward-seeking behavior, as well as the regulation of glucose metabolism and thermogenesis...
April 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28396702/interaction-between-prenatal-pesticide-exposure-and-a-common-polymorphism-in-the-pon1-gene-on-dna-methylation-in-genes-associated-with-cardio-metabolic-disease-risk-an-exploratory%C3%A2-study
#6
Ken Declerck, Sylvie Remy, Christine Wohlfahrt-Veje, Katharina M Main, Guy Van Camp, Greet Schoeters, Wim Vanden Berghe, Helle R Andersen
BACKGROUND: Prenatal environmental conditions may influence disease risk in later life. We previously found a gene-environment interaction between the paraoxonase 1 (PON1) Q192R genotype and prenatal pesticide exposure leading to an adverse cardio-metabolic risk profile at school age. However, the molecular mechanisms involved have not yet been resolved. It was hypothesized that epigenetics might be involved. The aim of the present study was therefore to investigate whether DNA methylation patterns in blood cells were related to prenatal pesticide exposure level, PON1 Q192R genotype, and associated metabolic effects observed in the children...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28396627/the-mesoaccumbens-pathway-a-retrograde-labeling-and-single-cell-axon-tracing-analysis-in-the-mouse
#7
Claudia Rodríguez-López, Francisco Clascá, Lucía Prensa
Neurons in the ventral tegmental area (VTA) that innervate the nucleus accumbens (Acb) constitute the so-called mesoaccumbens system. Increased activity by these neurons is correlated with the expectation and achievement of reward. The mesoaccumbens projection neurons are regarded as a central node in the brain networks that regulate drive and hedonic experience, and their dysregulation is a common pathophysiological step in addictive behaviors as well as major depression. Despite previous anatomical studies that have analyzed the origin of the mesoaccumbens axons within the VTA, regarded as a unit, the exact contributions of the various cytoarchitectural subdivisions of the VTA to this innervation is still unexplored; understanding these contributions would help further our understanding of their precise anatomical organization...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28392359/intracranial-self-stimulation-reward-induces-neurite-extension-in-pc12m3-cells-and-activation-of-the-p38-mapk-pathway
#8
Yutaka Gomita, Satoru Esumi, Naoya Sugiyama, Yoshihisa Kitamura, Yoshihisa Koike, Hirotoshi Motoda, Toshiaki Sendo, Yoshio Kano
Factors that trigger emotional expression may be divided into two patterns according to the type of motivation, acquiring reward (pleasure) and avoiding aversion (punishment). Repeated exposure to certain external stimuli accompanied by aberrant motivation may produce psychiatric diseases such as bipolar disorder and addiction via dysregulation of the central nervous system. However, neurobiological underpinnings of such diseases have not been clarified, especially at the neuronal level. In the present study, plasma from rats undergoing intracranial self-stimulation (ICSS) produced neurite outgrowth in PC12-variant cells (PC12m3)...
April 6, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28390647/brain-derived-neurotrophic-factor-in-the-mesolimbic-reward-circuitry-mediates-nociception-in-chronic-neuropathic-pain
#9
Hongxing Zhang, Yi-Ling Qian, Chen Li, Di Liu, Lei Wang, Xiao-Yi Wang, Mei-Jun Liu, He Liu, Song Zhang, Xiao-Yun Guo, Jun-Xia Yang, Hai-Lei Ding, Ja Wook Koo, Ezekiell Mouzon, Karl Deisseroth, Eric J Nestler, Venetia Zachariou, Ming-Hu Han, Jun-Li Cao
BACKGROUND: The mesolimbic reward system plays a critical role in modulating nociception; however, its underlying molecular, cellular, and neural circuitry mechanisms remain unknown. METHODS: Chronic constrictive injury (CCI) of the sciatic nerve was used to model neuropathic pain. Projection-specific in vitro recordings in mouse brain slices and in vivo recordings from anesthetized animals were used to measure firing of dopaminergic neurons in the ventral tegmental area (VTA)...
March 1, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28379939/re-evaluation-of-learned-information-in-drosophila
#10
Johannes Felsenberg, Oliver Barnstedt, Paola Cognigni, Suewei Lin, Scott Waddell
Animals constantly assess the reliability of learned information to optimize their behaviour. On retrieval, consolidated long-term memory can be neutralized by extinction if the learned prediction was inaccurate. Alternatively, retrieved memory can be maintained, following a period of reconsolidation during which it is labile. Although extinction and reconsolidation provide opportunities to alleviate problematic human memories, we lack a detailed mechanistic understanding of memory updating. Here we identify neural operations underpinning the re-evaluation of memory in Drosophila...
April 13, 2017: Nature
https://www.readbyqxmd.com/read/28376700/frontal-tbi-increases-impulsive-decision-making-in-rats-a-potential-role-for-the-inflammatory-cytokine-interleukin-12
#11
Cole Vonder Haar, Kris M Martens, Lara-Kirstie Riparip, Susanna Rosi, Cheryl L Wellington, Catharine A Winstanley
Traumatic brain injury is associated with the development of numerous psychiatric diseases. Of particular concern for TBI patients is the impact of chronic impulsivity on daily functioning. Despite the scope of the human problem, little has been done to address impulsivity in animal models of brain injury. In the current study, we examined the effects of either a severe or a milder bilateral frontal controlled cortical impact injury on impulsivity using the delay discounting task (DDT), in which preference for smaller-sooner over larger-later rewards is indicative of greater impulsive choice...
April 4, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28375493/the-continuum-of-neurosurgical-care-increasing-the-neurosurgeon-s-role-and-responsibility
#12
Edie E Zusman, Deborah L Benzil
The Health Care Reform Act has fostered a shift toward capitation and shared risk among providers to improve quality and reduce the escalating costs of healthcare. Like all physicians, neurosurgeons are increasingly being incentivized to participate in efforts to streamline care through the use of surgical pathways to reduce hospital length of stay and prevent readmissions. These changes have expanded the role of the neurosurgeon along the continuum of care for the neurosurgery patient. This paper predicts and advocates for a further broadening of neurosurgery participation from programs that reward physicians for helping to prevent a high-risk patient's need for surgery to management of postacute rehabilitation...
April 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28357192/psychopharmacology-of-tobacco-and-alcohol-comorbidity-a-review-of-current-evidence
#13
REVIEW
Sally Adams
PURPOSE OF THE REVIEW: Comorbidity of alcohol and tobacco use is highly prevalent and may exacerbate the health effects of either substance alone. However, the mechanisms underlying this comorbidity are not well understood. This review will examine the evidence for shared neurobiological mechanisms of alcohol and nicotine comorbidity and experimental studies of the behavioural consequences of these interactions. RECENT FINDINGS: Studies examining the shared neurobiology of alcohol and nicotine have identified two main mechanisms of comorbidity: (1) cross-reinforcement via the mesolimbic dopamine pathway and (2) cross-tolerance via shared genetic and nAChR interaction...
2017: Current Addiction Reports
https://www.readbyqxmd.com/read/28350146/-a-girl-with-self-harm-treated-with-n-acetylcysteine-nac
#14
C P Rus
Deliberate and recurrent self-harm could be regarded as addictive behaviour that can be treated with medication. In addiction, the dopaminergic mesolimbic reward system is activated. Pain caused by cutting stimulates the reward system through the opioid system. Glutamatergic neurotransmission follows the same pathway and plays a role in addiction as well. In this case-study a 17-year-old girl was successfully treated with N-acetylcysteine (nac) in order to reduce the frequency of self-cutting. In addition, in this case nac reduced the symptoms of attention deficit/hyperactivity disorder and depression...
2017: Tijdschrift Voor Psychiatrie
https://www.readbyqxmd.com/read/28344844/effort-reward-imbalance-at-work-parental-support-and-suicidal-ideation-in-adolescents-a-cross-sectional-study-from-chinese-dual-earner-families
#15
Jian Li, Adrian Loerbroks, Johannes Siegrist
BACKGROUND: In contemporary China, most parents are dual-earner couples and there is only one child in the family. We aimed to examine the associations of parents' work stress with suicidal ideation among the corresponding adolescent. We further hypothesized that low parental support experienced by adolescents may mediate the associations. METHODS: Cross-sectional data from school students and their working parents were used, with 907 families from Kunming City, China...
March 2017: Safety and Health At Work
https://www.readbyqxmd.com/read/28342771/the-area-postrema-ap-and-the-parabrachial-nucleus-pbn-are-important-sites-for-salmon-calcitonin-sct-to-decrease-evoked-phasic-dopamine-release-in-the-nucleus-accumbens-nac
#16
Lynda Whiting, James E McCutcheon, Christina Neuner-Boyle, Mitchell F Roitman, Thomas A Lutz
The pancreatic hormone amylin and its agonist salmon calcitonin (sCT) act via the area postrema (AP) and the lateral parabrachial nucleus (PBN) to reduce food intake. Investigations of amylin and sCT signaling in the ventral tegmental area (VTA) and nucleus accumbens (NAc) suggest that the eating inhibitory effect of amylin is, in part, mediated through the mesolimbic 'reward' pathway. Indeed, administration of the sCT directly to the VTA decreased phasic dopamine release (DA) in the NAc. However, it is not known if peripheral amylin modulates the mesolimbic system directly or whether this occurs via the AP and PBN...
March 22, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28338916/violent-offenders-respond-to-provocations-with-high-amygdala-and-striatal-reactivity
#17
Sofi da Cunha-Bang, Patrick MacDonald Fisher, Liv Vadskjær Hjordt, Erik Perfalk, Anine Persson Skibsted, Camilla Bock, Anders Ohlhues Baandrup, Marie Deen Christensen, Carsten Thomsen, Dorte Sestoft, Gitte M Knudsen
The ability to successfully suppress impulses and angry affect is fundamental to control aggressive reactions following provocations. The aim of this study was to examine neural responses to provocations and aggression using a laboratory model of reactive aggression. We used a novel functional magnetic resonance imaging point-subtraction aggression paradigm in 44 men, of whom 18 were incarcerated violent offenders and 26 were control non-offenders. We measured brain activation following provocations (monetary subtractions), while the subjects had the possibility to behave aggressively or pursue monetary rewards...
March 8, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28325815/neuropathic-pain-promotes-adaptive-changes-in-gene-expression-in-brain-networks-involved-in-stress-and-depression
#18
Giannina Descalzi, Vasiliki Mitsi, Immanuel Purushothaman, Sevasti Gaspari, Kleopatra Avrampou, Yong-Hwee Eddie Loh, Li Shen, Venetia Zachariou
Neuropathic pain is a complex chronic condition characterized by various sensory, cognitive, and affective symptoms. A large percentage of patients with neuropathic pain are also afflicted with depression and anxiety disorders, a pattern that is also seen in animal models. Furthermore, clinical and preclinical studies indicate that chronic pain corresponds with adaptations in several brain networks involved in mood, motivation, and reward. Chronic stress is also a major risk factor for depression. We investigated whether chronic pain and stress affect similar molecular mechanisms and whether chronic pain can affect gene expression patterns that are involved in depression...
March 21, 2017: Science Signaling
https://www.readbyqxmd.com/read/28325146/hypersexuality-as-a-neuropsychiatric-disorder-the-neurobiology-and-treatment-options
#19
Hatta Sidi, Muna Asiff, Jaya Kumar, Srijit Das, Nurul Hazwani Hatta, Cesar Alfonso
Hypersexuality refers to abnormally increased or extreme involvement in any sexual activity. It is clinically challenging, presents trans-diagnostically and there is extensive medical literature addressing nosology, pathogenesis and neuropsychiatric aspects. Classification includes deviant behaviours, diagnosable entities related to impulsivity, and obsessional phenomena. Some clinicians view an increase in sexual desire as 'normal' while psychodynamic theorists consider it ego-defensive at times alleviating unconscious anxiety rooted in intrapsychic conflicts...
March 21, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/28324454/reward-circuitry-in-addiction
#20
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
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