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https://www.readbyqxmd.com/read/28103527/distinct-cortico-striatal-connections-with-subthalamic-nucleus-underlie-facets-of-compulsivity
#1
Laurel S Morris, Kwangyeol Baek, Valerie Voon
The capacity to flexibly respond to contextual changes is crucial to adapting to a dynamic environment. Compulsivity, or behavioural inflexibility, consists of heterogeneous subtypes with overlapping yet discrete neural substrates. The subthalamic nucleus (STN) mediates the switch from automatic to controlled processing to slow, break or stop behaviour when necessary. Rodent STN lesions or inactivation are linked with perseveration or repetitive, compulsive responding. However, there are few studies examining the role of latent STN-centric neural networks and compulsive behaviour in healthy individuals...
December 29, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28103483/dynamic-interaction-between-reinforcement-learning-and-attention-in-multidimensional-environments
#2
Yuan Chang Leong, Angela Radulescu, Reka Daniel, Vivian DeWoskin, Yael Niv
Little is known about the relationship between attention and learning during decision making. Using eye tracking and multivariate pattern analysis of fMRI data, we measured participants' dimensional attention as they performed a trial-and-error learning task in which only one of three stimulus dimensions was relevant for reward at any given time. Analysis of participants' choices revealed that attention biased both value computation during choice and value update during learning. Value signals in the ventromedial prefrontal cortex and prediction errors in the striatum were similarly biased by attention...
January 18, 2017: Neuron
https://www.readbyqxmd.com/read/28102227/singular-location-and-signaling-profile-of-adenosine-a2a-cannabinoid-cb1-receptor-heteromers-in-the-dorsal-striatum
#3
Estefanía Moreno, Anna Chiarlone, Mireia Medrano, Mar Puigdellívol, Lucka Bibic, Lesley A Howell, Eva Resel, Nagore Puente, María J Casarejos, Juan Perucho, Joaquín Botta, Nuria Suelves, Francisco Ciruela, Silvia Ginés, Ismael Galve-Roperh, Vicent Casadó, Pedro Grandes, Beat Lutz, Krisztina Monory, Enric I Canela, Carmen Lluís, Peter J McCormick, Manuel Guzmán
The dorsal striatum is a key node for many neurobiological processes such as motor activity, cognitive functions, and affective processes. The proper functioning of striatal neurons relies critically on metabotropic receptors. Specifically, the main adenosine and endocannabinoid receptors present in the striatum, ie, adenosine A2A receptor (A2AR) and cannabinoid CB1 receptor (CB1R), are of pivotal importance in the control of neuronal excitability. Facilitatory and inhibitory functional interactions between striatal A2AR and CB1R have been reported, and evidence supports that this cross-talk may rely, at least in part, on the formation of A2AR-CB1R heteromeric complexes...
January 19, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28101525/untangling-basal-ganglia-network-dynamics-and-function-role-of-dopamine-depletion-and-inhibition-investigated-in-a-spiking-network-model
#4
Mikael Lindahl, Jeanette Hellgren Kotaleski
The basal ganglia are a crucial brain system for behavioral selection, and their function is disturbed in Parkinson's disease (PD), where neurons exhibit inappropriate synchronization and oscillations. We present a spiking neural model of basal ganglia including plausible details on synaptic dynamics, connectivity patterns, neuron behavior, and dopamine effects. Recordings of neuronal activity in the subthalamic nucleus and Type A (TA; arkypallidal) and Type I (TI; prototypical) neurons in globus pallidus externa were used to validate the model...
November 2016: ENeuro
https://www.readbyqxmd.com/read/28100851/effects-of-propofol-on-oxidative-stress-parameters-in-selected-parts-of-the-brain-in-a-rat-model-of-parkinson-disease
#5
Ewa Romuk, Wioletta Szczurek, Przemysław Nowak, Marta Skowron, Bernard Prudel, Edyta Hudziec, Ewa Chwalińska, Ewa Birkner
INTRODUCTION: Propofol is an intravenous sedative-hypnotic agent that is commonly used to induce and maintain general anaesthesia. This drug has antioxidant properties, which are partly caused by a phenolic structure similar to α-tocopherol. The present study aimed to evaluate the effect of propofol on the level of oxidative stress biomarkers in the frontal cortex, striatum, thalamus, hippocampus and cerebellum in rats with experimental Parkinson's disease (PD). MATERIAL/METHODS: The experiment was performed on 24 male Wistar rats assigned to the following groups: 1 - control; 2 - PD; 3 - PD with propofol...
December 31, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28100219/increased-amygdala-reactivity-following-early-life-stress-a-potential-resilience-enhancer-role
#6
Tetsuya Yamamoto, Shigeru Toki, Greg J Siegle, Masahiro Takamura, Yoshiyuki Takaishi, Shinpei Yoshimura, Go Okada, Tomoya Matsumoto, Takashi Nakao, Hiroyuki Muranaka, Yumiko Kaseda, Tsuneji Murakami, Yasumasa Okamoto, Shigeto Yamawaki
BACKGROUND: Amygdala hyper-reactivity is sometimes assumed to be a vulnerability factor that predates depression; however, in healthy people, who experience early life stress but do not become depressed, it may represent a resilience mechanism. We aimed to test these hypothesis examining whether increased amygdala activity in association with a history of early life stress (ELS) was negatively or positively associated with depressive symptoms and impact of negative life event stress in never-depressed adults...
January 18, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28097465/hydroxysafflor-yellow-a-improves-motor-dysfunction-in-the-rotenone-induced-mice-model-of-parkinson-s-disease
#7
Tian Wang, Lijie Wang, Cuiting Li, Bing Han, Zhenhua Wang, Ji Li, Yan Lv, Shuyun Wang, Fenghua Fu
Dopamine D3 receptor (DRD3) is diminished in patients of Parkinson's disease (PD). Brain-derived neurotrophic factor (BDNF) is responsible for regulating expression of the DRD3 in the brain. Our previous study showed that hydroxysafflor yellow A (HSYA) could increase BDNF content in the striatum of PD mice. This experiment aimed to evaluate whether HSYA can improve the motor dysfunction induced by rotenone through regulating the BDNF/TrkB/DRD3 signaling pathway in mice. Male C57/BL6 mice were intraperitoneally treated with HSYA...
January 17, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28096960/estrogen-agonist-genistein-differentially-influences-the-cognitive-and-motor-disorders-in-an-ovariectomized-animal-model-of-parkinsonism
#8
Elaheh Arbabi, Gholamali Hamidi, Sayyed Alireza Talaei, Mahmoud Salami
OBJECTIVES: Parkinson's disease (PD) is a progressive neurological disorder associated with motor disabilities and cognitive dysfunction as well. Evidence indicates that PD occurs less frequently in women than men, confirming a role for steroid hormones in protection of dopaminergic nigrostriatal neurons. It is reported that soy genistein, an estrogen agonist phytoestrogen, display neuroprotective effects against neuronal death. In this study we evaluated the effect of genistein in animal models of Parkinsonism (P) and Parkinsonism + ovariectomized (OP)...
December 2016: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28096470/dampened-amphetamine-stimulated-behavior-and-altered-dopamine-transporter-function-in-the-absence-of-brain-gdnf
#9
Jaakko Kopra, Anne Panhelainen, Sara Af Bjerkén, Lauriina Porokuokka, Kärt Varendi, Soophie Olfat, Heidi Montonen, T Petteri Piepponen, Mart Saarma, Jaan-Olle Andressoo
: Midbrain dopamine neuron dysfunction contributes to various psychiatric and neurological diseases including drug addiction and Parkinson's disease. Because of its well-established dopaminotrophic effects, the therapeutic potential of glial cell line-derived neurotrophic factor (GDNF) has been extensively studied in various disorders with disturbed dopamine homeostasis. The outcomes from pre-clinical and clinical studies vary, however, highlighting a need for a better understanding of the physiological role of GDNF on striatal dopaminergic function...
January 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28094974/monitoring-dopamine-responses-to-potassium-ion-and-nomifensine-by-in-vivo-microdialysis-with-online-liquid-chromatography-at-one-minute-resolution
#10
Khanh Thieu Ngo, Erika L Varner, Adrian Charles Michael, Stephen G Weber
Recently, our laboratory has demonstrated the technical feasibility of monitoring dopamine at one-min temporal resolution with microdialysis and online liquid chromatography. Here, we monitor dopamine in the rat striatum during local delivery of potassium ion and nomifensine in awake-behaving rats. Microdialysis probes were implanted and dopamine was monitored one or four Days later under basal conditions, during 10-min applications of 60 mM or 100 mM K+, and during 15-min applications of 10 µM nomifensine: K+ and nomifensine were delivered locally by adding them to the microdialysis perfusion fluid...
January 17, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28094034/dynamical-representation-of-dominance-relationships-in-the-human-rostromedial-prefrontal-cortex
#11
Romain Ligneul, Ignacio Obeso, Christian C Ruff, Jean-Claude Dreher
Humans and other primates have evolved the ability to represent their status in the group's social hierarchy, which is essential for avoiding harm and accessing resources. Yet it remains unclear how the human brain learns dominance status and adjusts behavior accordingly during dynamic social interactions. Here we address this issue with a combination of fMRI and transcranial direct current stimulation (tDCS). In a first fMRI experiment, participants learned an implicit dominance hierarchy while playing a competitive game against three opponents of different skills...
December 5, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/28093022/blunted-neural-response-to-anticipation-effort-and-consummation-of-reward-and-aversion-in-adolescents-with-depression-symptomatology
#12
Ewelina Rzepa, Jennifer Fisk, Ciara McCabe
Neural reward function has been proposed as a possible biomarker for depression. However, how the neural response to reward and aversion might differ in young adolescents with current symptoms of depression is as yet unclear. Thirty-three adolescents were recruited, 17 scoring low on the Mood and Feelings Questionnaire (low risk group) and 16 scoring high (high risk group). Our functional magnetic resonance imaging task measured; anticipation (pleasant/unpleasant cue), effort (achieve a pleasant taste or avoid an unpleasant taste) and consummation (pleasant/unpleasant tastes) in regions of interest; ventral medial prefrontal cortex, pregenual cingulate cortex, the insula and ventral striatum...
January 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28092323/brain-substrates-of-reward-processing-and-the-%C3%AE-opioid-receptor-a-pathway-into-pain
#13
Frauke Nees, Susanne Becker, Sabina Millenet, Tobias Banaschewski, Luise Poustka, Arun Bokde, Uli Bromberg, Christian Büchel, Patricia J Conrod, Sylvane Desrivières, Vincent Frouin, Jürgen Gallinat, Hugh Garavan, Andreas Heinz, Bernd Ittermann, Jean-Luc Martinot, Dimitri Papadopoulos Orfanos, Tomáš Paus, Michael N Smolka, Henrik Walter, Rob Whelan, Gunter Schumann, Herta Flor
The processing of reward and reinforcement learning seems to be important determinants of pain chronicity. However, reward processing is already altered early in life and if this is related to the development of pain symptoms later on is not known. The aim of this study was first to examine whether behavioural and brain-related indicators of reward processing at the age of 14 to 15 years are significant predictors of pain complaints 2 years later, at 16 to 17 years. Second, we investigated the contribution of genetic variations in the opioidergic system, which is linked to the processing of both, reward and pain, to this prediction...
February 2017: Pain
https://www.readbyqxmd.com/read/28091566/efficient-generation-of-hpsc-derived-midbrain-dopaminergic-neurons-in-a-fully-defined-scalable-3d-biomaterial-platform
#14
Maroof M Adil, Gonçalo M C Rodrigues, Rishikesh U Kulkarni, Antara T Rao, Nicole E Chernavsky, Evan W Miller, David V Schaffer
Pluripotent stem cells (PSCs) have major potential as an unlimited source of functional cells for many biomedical applications; however, the development of cell manufacturing systems to enable this promise faces many challenges. For example, there have been major recent advances in the generation of midbrain dopaminergic (mDA) neurons from stem cells for Parkinson's Disease (PD) therapy; however, production of these cells typically involves undefined components and difficult to scale 2D culture formats. Here, we used a fully defined, 3D, thermoresponsive biomaterial platform to rapidly generate large numbers of action-potential firing mDA neurons after 25 days of differentiation (~40% tyrosine hydroxylase (TH) positive, maturing into 25% cells exhibiting mDA neuron-like spiking behavior)...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090177/the-effects-of-crocin-on-6-ohda-induced-oxidative-nitrosative-damage-and-motor-behaviour-in-hemiparkinsonian-rats
#15
Maryam Hosseini, Ziba Rajaei, Hojjatallah Alaei, Mohamadhasan Tajadini
BACKGROUND: Crocin is considered to prevent oxidative stress-related diseases, such as ischemia and Alzheimer's. The aim of the present investigation was to evaluate the effects of crocin on motor behaviour and 6-OHDA-induced oxidative/nitrosative damage to the striatum in an experimental model of Parkinson's disease. METHODS: Left medial forebrain bundle was lesioned by microinjection of 6-OHDA (16μg in 0.2% ascorbate-saline). Crocin (30 and 60 mg/kg) was injected intraperitoneally three days before surgery until six weeks...
November 2016: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28088642/anti-rage-antibody-selectively-blocks-acute-systemic-inflammatory-responses-to-lps-in-serum-liver-csf-and-striatum
#16
Juciano Gasparotto, Camila Tiefensee Ribeiro, Rafael Calixto Bortolin, Henrique Schaan Fernandes, Alexsander Alves Teixeira, Marcelo Otavio Rodrigues Guasselli, Crepin Aziz Jose O Agani, Natália Cabral Souza, Mateus Grings, Guilhian Leipnitz, Henrique Mautone Gomes, Matheus Augusto de Bittencourt Pasquali, Peter R Dunkley, Phillip W Dickson, José Claudio Fonseca Moreira, Daniel Pens Gelain
Systemic inflammation induces transient or permanent dysfunction in the brain by exposing it to soluble inflammatory mediators. The receptor for advanced glycation endproducts (RAGE) binds to distinct ligands mediating and increasing inflammatory processes. In this study we used an LPS-induced systemic inflammation model in rats to investigate the effect of blocking RAGE in serum, liver, cerebrospinal fluid (CSF) and brain (striatum, prefrontal cortex, ventral tegmental area and substantia nigra). Intraperitoneal injection of RAGE antibody (50 μg/kg) was followed after 1h by a single LPS (5 mg/kg) intraperitoneal injection...
January 11, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28088578/the-effect-of-long-term-hindlimb-unloading-on-the-expression-of-risk-neurogenes-encoding-elements-of-serotonin-dopaminergic-systems-and-apoptosis-comparison-with-the-effect-of-actual-spaceflight-on-mouse-brain
#17
E A Kulikova, V A Kulikov, N A Sinyakova, A V Kulikov, N K Popova
The study of spaceflight effects on the brain is technically complex concern; complicated by the problem of applying an adequate ground model. The most-widely used experimental model to study the effect of microgravity is the tail-suspension hindlimb unloading model; however, its compliance with the effect of actual spaceflight on the brain is still unclear. We evaluated the effect of one month hindlimb unloading on the expression of genes related to the brain neuroplasticity - brain neutotrophic factors (Gdnf, Cdnf), apoptotic factors (Bcl-xl, Bax), serotonin- and dopaminergic systems (5-HT2A, Maoa, Maob, Th, D1r, Comt), and compared the results with the data obtained on mice that spent one month in spaceflight on Russian biosatellite Bion-M1...
January 11, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28087359/the-effect-of-nmda-r-antagonism-on-simultaneously-acquired-local-field-potentials-and-tissue-oxygen-levels-in-the-brains-of-freely-moving-rats
#18
John Kealy, Sean Commins, John P Lowry
Non-competitive NMDA receptor antagonists are known to induce psychosis-like symptoms in rodents. Administration of such compounds cause behavioural effects such as memory impairment and hyperlocomotion. Additionally, drugs such as phencyclidine (PCP), ketamine and MK-801 all cause distinctive increases in striatal local field potential (LFP) in the high frequency oscillation (HFO) band in the power spectrum (140-180 Hz). Amperometric sensors provide a means to measure tissue oxygen (tO2; a BOLD-like signal) in the brains of freely-moving rats while simultaneously acquiring LFP using the same electrode...
January 10, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28087224/5-ht6-receptor-blockade-regulates-primary-cilia-morphology-in-striatal-neurons
#19
Matthew Brodsky, Adam J Lesiak, Alex Croicu, Nathalie Cohenca, Jane M Sullivan, John F Neumaier
The 5-HT6 receptor has been implicated in a variety of cognitive processes including habitual behaviors, learning, and memory. It is found almost exclusively in the brain, is expressed abundantly in striatum, and localizes to neuronal primary cilia. Primary cilia are antenna-like, sensory organelles found on most neurons that receive both chemical and mechanical signals from other cells and the surrounding environment; however, the effect of 5-HT6 receptor function on cellular morphology has not been examined...
January 10, 2017: Brain Research
https://www.readbyqxmd.com/read/28077707/organization-of-the-claustrum-to-entorhinal-cortical-connection-in-mice
#20
Takuma Kitanishi, Naoki Matsuo
: The claustrum, a subcortical structure situated between the insular cortex and striatum, is reciprocally connected with almost all neocortical regions. Based on this connectivity, the claustrum has been postulated to integrate multisensory information and, in turn, coordinate widespread cortical activity. Although studies have identified how sensory information is mapped onto the claustrum, the function of individual topographically arranged claustro-cortical pathways has been little explored...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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