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Dopamine and working memory

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https://www.readbyqxmd.com/read/29415163/genetic-variation-of-a-drd2-co-expression-network-is-associated-with-changes-in-prefrontal-function-after-d2-receptors-stimulation
#1
Pierluigi Selvaggi, Giulio Pergola, Barbara Gelao, Pasquale Di Carlo, Maria Antonietta Nettis, Graziella Amico, Leonardo Fazio, Antonio Rampino, Fabio Sambataro, Giuseppe Blasi, Alessandro Bertolino
Dopamine D2 receptors (D2Rs) contribute to the inverted U-shaped relationship between dopamine signaling and prefrontal function. Genetic networks from post-mortem human brain revealed 84 partner genes co-expressed with DRD2. Moreover, eight functional single nucleotide polymorphisms combined into a polygenic co-expression index (PCI) predicted co-expression of this DRD2 network and were associated with prefrontal function in humans. Here, we investigated the non-linear association of the PCI with behavioral and Working Memory (WM) related brain response to pharmacological D2Rs stimulation...
February 3, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29410219/dopaminergic-modulation-of-hemodynamic-signal-variability-and-the-functional-connectome-during-cognitive-performance
#2
Mohsen Alavash, Sung-Joo Lim, Christiane Thiel, Bernhard Sehm, Lorenz Deserno, Jonas Obleser
Dopamine underlies important aspects of cognition, and has been suggested to boost cognitive performance. However, how dopamine modulates the large-scale cortical dynamics during cognitive performance has remained elusive. Using functional MRI during a working memory task in healthy young human listeners, we investigated the effect of levodopa (l-dopa) on two aspects of cortical dynamics, blood oxygen-level-dependent (BOLD) signal variability and the functional connectome of large-scale cortical networks. We here show that enhanced dopaminergic signaling modulates the two potentially interrelated aspects of large-scale cortical dynamics during cognitive performance, and the degree of these modulations is able to explain inter-individual differences in l-dopa-induced behavioral benefits...
February 2, 2018: NeuroImage
https://www.readbyqxmd.com/read/29391391/a-systematic-review-of-the-role-of-the-nociceptin-receptor-system-in-stress-cognition-and-reward-relevance-to-schizophrenia
#3
REVIEW
Muhammad Saad Khan, Isabelle Boileau, Nathan Kolla, Romina Mizrahi
Schizophrenia is a debilitating neuropsychiatric illness that is characterized by positive, negative, and cognitive symptoms. Research over the past two decades suggests that the nociceptin receptor system may be involved in domains affected in schizophrenia, based on evidence aligning it with hallmark features of the disorder. First, aberrant glutamatergic and striatal dopaminergic function are associated with psychotic symptoms, and the nociceptin receptor system has been shown to regulate dopamine and glutamate transmission...
February 2, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29377353/blockade-of-dopamine-d2-receptors-disrupts-intrahippocampal-connectivity-and-enhances-pain-related-working-memory-deficits-in-neuropathic-pain-rats
#4
H Cardoso-Cruz, M Dourado, C Monteiro, V Galhardo
BACKGROUND: Dopamine (DA) is thought to be important to local hippocampal networks integrity during spatial working memory (sWM) processing. Chronic pain may contribute to deficient dopaminergic signalling, which may in turn affect cognition. However, the neural mechanisms that determine this impairment are poorly understood. Here, we evaluated whether the sWM impairment characteristic of animal models of chronic pain is dependent on DA D2 receptor (D2r) activity. METHODS: To address this issue, we implanted multichannel arrays of electrodes in the dorsal and ventral hippocampal CA1 field (dvCA1) of rats and recorded the neuronal activity during a classical delayed food-reinforced T-maze sWM task...
January 26, 2018: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/29348190/pronounced-hyperactivity-cognitive-dysfunctions-and-bdnf-dysregulation-in-dopamine-transporter-knockout-rats
#5
Damiana Leo, Ilya Sukhanov, Francesca Zoratto, Placido Illiano, Lucia Caffino, Fabrizio Sanna, Giulia Messa, Marco Emanuele, Alessandro Esposito, Maria Dorofeikova, Evgeny A Budygin, Liudmila Mus, Evgenia E Efimova, Marco Niello, Stefano Espinoza, Tatyana D Sotnikova, Marius C Hoener, Gianni Laviola, Fabio Fumagalli, Walter Adriani, Raul R Gainetdinov
Dopamine (DA) controls many vital physiological functions and is critically involved in several neuropsychiatric disorders such as schizophrenia and attention deficit hyperactivity disorder (ADHD). The major function of the plasma membrane dopamine transporter (DAT) is the rapid uptake of released DA into presynaptic nerve terminals leading to control of both the extracellular levels of DA and the intracellular stores of DA. Here, we present a newly developed strain of rats (DAT-knockout, DAT-KO rats) in which the gene encoding the DAT has been disrupted by using zinc finger nuclease technology (ZFN)...
January 18, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29310263/facile-synthesis-of-near-infrared-excited-nayf4-yb3-tm3-nanoparticles-for-label-free-detection-of-dopamine-in-biological-fluids
#6
Bing Zhao, Yan Li
Rare-earth-doped upconversion nanoparticles (UCNPs) behaved advantages such as non-autofluorescence, environment-friendly synthetic route, low cost and simple detection procedures. In addition, the UCNPs show unique upconvering optical property of converting low-energy infrared photons to high-energy visible ones. Here in our work, water and ethylene glycol at the ratio of 1/1 (v/v) were chosen as solvent. Polyethyleneimine (PEI) was chosen as surface additives to synthesize the NaYF4:Yb3+, Tm3+ UCNPs by one-pot route at 200°C...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29259546/neither-cholinergic-nor-dopaminergic-enhancement-improve-spatial-working-memory-precision-in-humans
#7
Adeola N Harewood Smith, Jnana Aditya Challa, Michael A Silver
Acetylcholine and dopamine are neurotransmitters that play multiple important roles in perception and cognition. Pharmacological cholinergic enhancement reduces excitatory receptive field size of neurons in marmoset primary visual cortex and sharpens the spatial tuning of visual perception and visual cortical fMRI responses in humans. Moreover, previous studies show that manipulation of cholinergic or dopaminergic signaling alters the spatial tuning of macaque prefrontal cortical neurons during the delay period of a spatial working memory (SWM) task and can improve SWM performance in macaque monkeys and human subjects...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29259545/neuromodulation-of-prefrontal-cortex-in-non-human-primates-by-dopaminergic-receptors-during-rule-guided-flexible-behavior-and-cognitive-control
#8
REVIEW
Susheel Vijayraghavan, Alex J Major, Stefan Everling
The prefrontal cortex (PFC) is indispensable for several higher-order cognitive and executive capacities of primates, including representation of salient stimuli in working memory (WM), maintenance of cognitive task set, inhibition of inappropriate responses and rule-guided flexible behavior. PFC networks are subject to robust neuromodulation from ascending catecholaminergic systems. Disruption of these systems in PFC has been implicated in cognitive deficits associated with several neuropsychiatric disorders...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29248614/significant-association-between-catechol-o-methyltransferase-comt-val158-108met-polymorphism-and-cognitive-function-in-veterans-with-ptsd
#9
Ana Havelka Mestrovic, Lucija Tudor, Matea Nikolac Perkovic, Gordana Nedic Erjavec, Zrnka Kovacic Petrovic, Dubravka Svob Strac, Marcela Konjevod, Nela Pivac
Core features of posttraumatic stress disorder (PTSD) are cognitive disturbances. Enzyme catechol-O-methyltransferase (COMT) degrades dopamine primarily in prefrontal cortex. Its functional polymorphism, COMT Val158/108Met, affects COMT activity and dopamine availability and is associated with disturbances in cognition. The hypothesis was that PTSD subjects will have worse working memory than healthy controls and that the carriers of the COMT Met allele will show better cognitive performance compared to Val/Val carriers in PTSD and controls subjects...
December 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29203575/chronic-%C3%AE-9-thc-in-rhesus-monkeys-effects-on-cognitive-performance-and-dopamine-d2-d3-receptor-availability
#10
William S John, Thomas J Martin, Kiran Kumar Solingapuram Sai, Susan H Nader, H Donald Gage, Akiva Mintz, Michael A Nader
Cannabis-related impairments to cognitive function may represent novel therapeutic targets for cannabis-use disorder, although the nature, persistence, and reversibility of such deficits remain unclear. Adult male rhesus monkeys ( N = 6) responded in the morning on tasks designed to assess different cognitive domains using the Cambridge Neuropsychological Test Automated Battery (CANTAB) touchscreens followed by responding maintained under a fixed-ratio (FR) 10 schedule of food presentation in different operant chambers...
February 2018: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29167328/perceptual-decisions-based-on-previously-learned-information-are-independent-of-dopaminergic-tone
#11
Alessandra Perugini, Michele A Basso
Both cognitive and motor symptoms in people with Parkinson's disease (PD) arise from either too little or too much dopamine (DA). Akinesia stems from DA neuronal cell loss and dyskinesia often stems from an overdose of DA medication. Cognitive behaviors typically associated with frontal cortical function such as working memory and task switching are also affected by too little or too much DA in PD. Whether motor and cognitive circuits overlap in PD is unknown. Here, we show that whereas motor performance improves in people with PD when on dopaminergic medication compared to off medication, memory-based decision-making performance remains impaired whether on or off medications...
November 22, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29135273/-neuroscience-of-mental-flexibility
#12
Zoltán Janka
Mental flexibility enabling shifts from the usual prepotent behaviour to new strategies and solutions is a significant factor in the successful adaptation to the changing environment. Components of mental flexibility comprise attention, salience detection, inhibition, working memory and switch processes which can be measured by neurocognitive tests. Data derived from examinations by the methods of cognitive neuroscience can be compared to the features, observed under resting state and during task performance, of brain structures and functions...
November 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/29090092/current-understanding-of-the-molecular-mechanisms-in-parkinson-s-disease-targets-for-potential-treatments
#13
REVIEW
Panchanan Maiti, Jayeeta Manna, Gary L Dunbar
Gradual degeneration and loss of dopaminergic neurons in the substantia nigra, pars compacta and subsequent reduction of dopamine levels in striatum are associated with motor deficits that characterize Parkinson's disease (PD). In addition, half of the PD patients also exhibit frontostriatal-mediated executive dysfunction, including deficits in attention, short-term working memory, speed of mental processing, and impulsivity. The most commonly used treatments for PD are only partially or transiently effective and are available or applicable to a minority of patients...
2017: Translational Neurodegeneration
https://www.readbyqxmd.com/read/29081740/spatial-working-memory-in-male-rats-pre-experience-and-task-dependent-roles-of-dopamine-d1-and-d2-like-receptors
#14
Mekite Bezu, Jovana Maliković, Martina Kristofova, Ephrem Engidawork, Harald Höger, Gert Lubec, Volker Korz
The dopaminergic system is known to be involved in working memory processed by several brain regions like prefrontal cortex (PFC), hippocampus, striatum. In an earlier study we could show that Levodopa but not Modafinil enhanced working memory in a T-maze only during the early phase of training (day 3), whereas the later phase remained unaffected. Rats treated with a higher dose performed better than low dose treated rats. Here we could more specifically segregate the contributions of dopamine type 1- and 2- like receptors (D1R; D2R) to the training state dependent modulation of spatial working memory by intracerebroventricular (ICV) application of a D1R-like (SKF81297) and D2R-like agonist (Sumanirole) and antagonist (SCH23390, Remoxipride) at a low and high dose through 3 days of training...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29063713/cognition-and-the-course-of-prodromal-parkinson-s-disease
#15
Daniel Weintraub, Lana M Chahine, Keith A Hawkins, Andrew Siderowf, Shirley Eberly, David Oakes, John Seibyl, Matthew B Stern, Kenneth Marek, Danna Jennings
BACKGROUND: Prospective data on cognition in prodromal Parkinson's disease are limited. The objectives of this study were to assess in prodromal PD (1) if baseline cognition predicts conversion to clinical PD, (2) if baseline dopamine transporter binding predicts longitudinal changes in cognition, and (3) if impaired olfaction predicts future cognitive decline. METHODS: Prodromal participants were 136 hyposmic individuals enrolled in the Parkinson Associated Risk Study...
November 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/29056909/the-dopamine-d5-receptor-is-involved-in-working-memory
#16
Gregory V Carr, Federica Maltese, David R Sibley, Daniel R Weinberger, Francesco Papaleo
Pharmacological studies indicate that dopamine D1-like receptors (D1 and D5) are critically involved in cognitive function. However, the lack of pharmacological ligands selective for either the D1 or D5 receptors has made it difficult to determine the unique contributions of the D1-like family members. To circumvent these pharmacological limitations, we used D5 receptor homozygous (-/-) and heterozygous (+/-) knockout mice, to identify the specific role of this receptor in higher order cognitive functions. We identified a novel role for D5 receptors in the regulation of spatial working memory and temporal order memory function...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29054431/lesions-of-the-lateral-habenula-improve-working-memory-performance-in-hemiparkinsonian-rats
#17
Cheng Xue Du, Jian Liu, Yuan Guo, Li Zhang, Qiao Jun Zhang
The lateral habenula (LHb) is an important structure involved in various brain functions, because it controls the activity of dopaminergic and serotonergic systems in the midbrain. The impairment of working memory commonly occurs in Parkinson's disease; however, it is not clear whether the LHb involves in the regulation of working memory in rats with unilateral 6-hydroxydopamine lesions of the medial forebrain bundle (MFB). In this study, we found that the MFB lesions in rats decreased choice accuracy as measured by the T-maze rewarded alternation test compared to control rats, indicating the induction of working memory impairment, and decreased dopamine (DA) levels in the medial prefrontal cortex (mPFC), hippocampus and amygdala...
October 17, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29043468/cognitive-and-behavioral-disorders-in-parkinson-s-disease-an-update-i-cognitive-impairments
#18
Costanza Papagno, Luigi Trojano
Parkinson's disease (PD) is a progressive neurodegenerative disease characterized by motor symptoms such as rigidity, rest tremor, and bradykinesia. However, a growing body of evidence demonstrated that PD encompasses several non-motor disturbances as well, such as cognitive impairment. Cognitive defects can be present since early stages of the disease but tend to dominate the clinical picture as the disease progresses. Around 40% of patients with PD present with cognitive impairments in several cognitive domains including attention, working memory and executive functions, language, visuospatial skills, and episodic memory; in later stages of the disease, cognitive defects and associated behavioral disorders concur to determine clinically relevant PD-associated dementia...
October 17, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/29040416/fractionating-the-neurocognitive-mechanisms-underlying-working-memory-independent-effects-of-dopamine-and-parkinson-s-disease
#19
Sean James Fallon, Rozemarijn Margaretha Mattiesing, Kinan Muhammed, Sanjay Manohar, Masud Husain
Deficits in working memory (WM) in Parkinson's disease (PD) are often considered to be secondary to dopaminergic depletion. However, the neurocognitive mechanisms by which dopamine causes these deficits remain highly contested, and PD is now also known to be associated with nondopaminergic pathology. Here, we examined how PD and dopaminergic medication modulate three components of WM: maintenance over time, updating contents with new information and making memories distracter-resistant. Compared with controls, patients were disproportionately impaired when retaining information for longer durations...
December 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29028935/latent-profile-analysis-reveals-behavioral-and-brain-correlates-of-dopamine-cognition-associations
#20
Martin Lövdén, Nina Karalija, Micael Andersson, Anders Wåhlin, Jan Axelsson, Ylva Köhncke, Lars S Jonasson, Anna Rieckman, Goran Papenberg, Douglas D Garrett, Marc Guitart-Masip, Alireza Salami, Katrine Riklund, Lars Bäckman, Lars Nyberg, Ulman Lindenberger
Evidence suggests that associations between the neurotransmitter dopamine and cognition are nonmonotonic and open to modulation by various other factors. The functional implications of a given level of dopamine may therefore differ from person to person. By applying latent-profile analysis to a large (n = 181) sample of adults aged 64-68 years, we probabilistically identified 3 subgroups that explain the multivariate associations between dopamine D2/3R availability (probed with 11C-raclopride-PET, in cortical, striatal, and hippocampal regions) and cognitive performance (episodic memory, working memory, and perceptual speed)...
September 25, 2017: Cerebral Cortex
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