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https://www.readbyqxmd.com/read/28449351/long-term-plasticity-of-corticostriatal-synapses-is-modulated-by-pathway-specific-co-release-of-opioids-through-kappa-opioid-receptors
#1
Sarah L Hawes, Armando G Salinas, David M Lovinger, Kim T Blackwell
Synaptic plasticity in striatum adjusts behaviour adaptively during skill learning, or maladaptively in the case of addiction. Just as dopamine plays a critical role in synaptic plasticity underlying normal skill learning and addiction, endogenous and exogenous opiates also modulate learning and addiction-related striatal plasticity. Though the role of opioid receptors in long-term depression in striatum has been characterized, their effect on long-term potentiation (LTP) remains unknown. In particular, direct pathway (Dopamine D1 Receptor containing; D1R) - spiny projection neurons (SPNs) co-release the opioid neuropeptide dynorphin, which acts at presynaptic kappa opioid receptors (KORs) on dopaminergic afferents and can negatively regulate dopamine release...
April 27, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28444823/dissociable-corticostriatal-circuits-underlie-goal-directed-versus-cue-elicited-habitual-food-seeking-after-satiation-evidence-from-a-multimodal-mri-study
#2
Henk van Steenbergen, Poppy Watson, Reinout W Wiers, Bernhard Hommel, Sanne de Wit
The present multimodal MRI study advances our understanding of the corticostriatal circuits underlying goal-directed versus cue-driven, habitual food seeking. To this end, we employed a computerized Pavlovian-instrumental transfer (PIT) paradigm. During the test phase, participants were free to perform learnt instrumental responses (left and right key presses) for popcorn and Smarties outcomes. Importantly, prior to this test half of the participants had been sated on popcorn and the other half on Smarties - resulting in a reduced desirability of those outcomes...
April 26, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28425701/the-effects-of-glutamate-receptor-activation-on-local-oxygen-changes
#3
Lindsay Walton, Nick G Boustead, Susan Carroll, R Mark Wightman
Glutamate is ubiquitous throughout the brain and serves as the primary excitatory neurotransmitter. Neurons require energy to fire, and energetic substrates (i.e., O2, glucose) are renewed via cerebral blood flow (CBF) to maintain metabolic homeostasis. Magnetic resonance brain functionality studies rely on the assumption that CBF and neuronal activity are coupled consistently throughout the brain; however, the origin of neuronal activity does not always coincide with signals indicative of energy consumption (e...
April 20, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28418398/intranasal-oxytocin-enhances-intrinsic-corticostriatal-functional-connectivity-in-women
#4
R A I Bethlehem, M V Lombardo, M-C Lai, B Auyeung, S K Crockford, J Deakin, S Soubramanian, A Sule, P Kundu, V Voon, S Baron-Cohen
Oxytocin may influence various human behaviors and the connectivity across subcortical and cortical networks. Previous oxytocin studies are male biased and often constrained by task-based inferences. Here, we investigate the impact of oxytocin on resting-state connectivity between subcortical and cortical networks in women. We collected resting-state functional magnetic resonance imaging (fMRI) data on 26 typically developing women 40 min following intranasal oxytocin administration using a double-blind placebo-controlled crossover design...
April 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28408325/developmental-control-of-spike-timing-dependent-plasticity-by-tonic-gabaergic-signaling-in-striatum
#5
Silvana Valtcheva, Vincent Paille, Yulia Dembitskaya, Sylvie Perez, Giuseppe Gangarossa, Elodie Fino, Laurent Venance
Activity-dependent long-term potentiation (LTP) and depression (LTD) of synaptic strength underlie multiple forms of learning and memory. Spike-timing-dependent plasticity (STDP) has been described as a Hebbian synaptic learning rule that could account for experience-dependent changes in neural networks, but little is known about whether and how STDP evolves during development. We previously showed that GABAergic signaling governs STDP polarity and thus operates as a Hebbian/anti-Hebbian switch in the striatum...
April 10, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28404798/alterations-of-functional-connectivity-of-the-motor-cortex-in-fabry-disease-an-rs-fmri-study
#6
Sirio Cocozza, Antonio Pisani, Gaia Olivo, Francesco Saccà, Lorenzo Ugga, Eleonora Riccio, Silvia Migliaccio, Vincenzo Brescia Morra, Arturo Brunetti, Mario Quarantelli, Enrico Tedeschi
OBJECTIVE: To evaluate the presence of functional connectivity (FC) alterations of the motor circuits in patients with Fabry disease (FD) and their possible correlation with clinical variables with a resting-state (RS) fMRI analysis. METHODS: In our cross-sectional study, 32 patients with FD with genetically confirmed classic diagnosis of FD (12 men, mean age 43.3 ± 12.2 years) were enrolled along with 35 healthy controls (HCs) of comparable age and sex (14 men, mean age 42...
April 12, 2017: Neurology
https://www.readbyqxmd.com/read/28401924/the-human-coparental-bond-implicates-distinct-corticostriatal-pathways-longitudinal-impact-on-family-formation-and-child-well-being
#7
Eyal Abraham, Gadi Gilam, Yaniv Kanat-Maymon, Yael Jacob, Orna Zagoory-Sharon, Talma Hendler, Ruth Feldman
Alloparental care, the cooperative care of offspring by group members other than the biological mother, has been widely practiced since early hominin evolution to increase infant survival and thriving. The coparental bond-a relationship of solidarity and commitment between two adults who join their effort to care for children- is a central contributor to children's well-being and sociality; yet, the neural basis of coparenting has not been studied in humans. Here, we followed 84 first-time co-parents (42 couples) across the first six years of family formation, including opposite-sex and same-sex couples, measured brain response to coparental stimuli, observed collaborative and undermining coparental behaviors in infancy and preschool, assayed oxytocin (OT) and vasopressin (AVP), and measured coparenting and child behavior problems at six years...
April 12, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28394013/intermittent-theta-burst-stimulation-rescues-dopamine-dependent-corticostriatal-synaptic-plasticity-and-motor-behavior-in-experimental-parkinsonism-possible-role-of-glial-activity
#8
Fabrizio Cacace, Desirèe Mineo, Maria Teresa Viscomi, Emanuele Claudio Latagliata, Maria Mancini, Valeria Sasso, Anna Vannelli, Tiziana Pascucci, Valentina Pendolino, Elena Marcello, Silvia Pelucchi, Stefano Puglisi-Allegra, Marco Molinari, Barbara Picconi, Paolo Calabresi, Veronica Ghiglieri
BACKGROUND: Recent studies support the therapeutic utility of repetitive transcranial magnetic stimulation in Parkinson's disease (PD), whose progression is correlated with loss of corticostriatal long-term potentiation and long-term depression. Glial cell activation is also a feature of PD that is gaining increasing attention in the field because astrocytes play a role in chronic neuroinflammatory responses but are also able to manage dopamine (DA) levels. METHODS: Intermittent theta-burst stimulation protocol was applied to study the effect of therapeutic neuromodulation on striatal DA levels measured by means of in vivo microdialysis in 6-hydroxydopamine-hemilesioned rats...
April 10, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28392265/norepinephrine-regulates-cocaine-primed-reinstatement-via-%C3%AE-1-adrenergic-receptors-in-the-medial-prefrontal-cortex
#9
Karl T Schmidt, Jason P Schroeder, Stephanie L Foster, Katherine Squires, Brilee M Smith, Elizabeth G Pitts, Michael P Epstein, David Weinshenker
Drug-primed reinstatement of cocaine seeking in rats is thought to reflect relapse-like behavior and is mediated by the integration of signals from mesocorticolimbic dopaminergic projections and corticostriatal glutamatergic innervation. Cocaine-primed reinstatement can also be attenuated by systemic administration of dopamine β-hydroxylase (DBH) inhibitors, which prevent norepinephrine (NE) synthesis, or by α1-adrenergic receptor (α1AR) antagonists, indicating functional modulation by the noradrenergic system...
April 6, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28384268/interplay-between-periodic-stimulation-and-gabaergic-inhibition-in-striatal-network-oscillations
#10
Jovana J Belić, Arvind Kumar, Jeanette Hellgren Kotaleski
Network oscillations are ubiquitous across many brain regions. In the basal ganglia, oscillations are also present at many levels and a wide range of characteristic frequencies have been reported to occur during both health and disease. The striatum, the main input nucleus of the basal ganglia, receives massive glutamatergic inputs from the cortex and is highly susceptible to external oscillations. However, there is limited knowledge about the exact nature of this routing process and therefore, it is of key importance to understand how time-dependent, external stimuli propagate through the striatal circuitry...
2017: PloS One
https://www.readbyqxmd.com/read/28370471/motor-deficits-and-beta-oscillations-are-dissociable-in-an-alpha-synuclein-model-of-parkinson-s-disease
#11
Ivani Brys, Jessica Nunes, Romulo Fuentes
Parkinson's disease (PD) is a neurodegenerative disorder characterized by progressive motor symptoms resulting from chronic loss of dopaminergic neurons in the nigrostriatal pathway. The over expression of the protein alpha-synuclein in the substantia nigra has been used to induce progressive dopaminergic neuronal loss and to reproduce key histopathological and temporal features of PD in animal models. However the neurophysiological aspects of the alpha-synuclein PD model have been poorly characterized. Hereby we performed chronic in vivo electrophysiological recordings in the corticostriatal circuit of rats injected with viral vector to over express alpha-synuclein in the right substantia nigra...
March 30, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28331177/baseline-dependent-effects-of-amphetamine-on-attention-are-associated-with-striatal-dopamine-metabolism
#12
Karly M Turner, James Peak, Thomas H J Burne
Psychostimulants, such as amphetamine, are widely used to treat attentional deficits. In humans, response to dopaminergic medications is complex with improvement often dependent on baseline performance. Our goal was to determine if attention in rats could be improved by low dose amphetamine in a baseline-dependent manner by examining the relationship between task performance, drug response and monoamine levels in corticostriatal tissue. Firstly, rats performed a signal detection task with varying signal durations before administration of saline, 0...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28322982/toward-biomarkers-of-the-addicted-human-brain-using-neuroimaging-to-predict-relapse-and-sustained-abstinence-in-substance-use-disorder
#13
REVIEW
Scott J Moeller, Martin P Paulus
The ability to predict relapse is a major goal of drug addiction research. Clinical and diagnostic measures are useful in this regard, but these measures do not fully and consistently identify who will relapse and who will remain abstinent. Neuroimaging approaches have the potential to complement these standard clinical measures to optimize relapse prediction. The goal of this review was to survey the existing drug addiction literature that either used a baseline functional or structural neuroimaging phenotype to longitudinally predict a clinical outcome, or that examined test-retest of a neuroimaging phenotype during a course of abstinence or treatment...
March 18, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28294137/relationship-between-duration-of-untreated-psychosis-and-intrinsic-corticostriatal-connectivity-in-patients-with-early-phase-schizophrenia
#14
Deepak K Sarpal, Delbert G Robinson, Christina Fales, Todd Lencz, Miklos Argyelan, Katherine H Karlsgodt, Juan A Gallego, Majnu John, John M Kane, Philip R Szeszko, Anil K Malhotra
Patients with first-episode psychosis experience psychotic symptoms for a mean of up to 2 years prior to initiation of treatment, and long duration of untreated psychosis (DUP) is associated with poor clinical outcomes. Meanwhile, evidence compiled from numerous studies suggests that longer DUP is not associated with structural brain abnormalities. To date, few studies have examined the relationship between DUP and functional neuroimaging measures. In the present study, we used seed-based resting-state functional connectivity to examine the impact of DUP on corticostriatal circuitry...
April 5, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28243821/the-impact-of-short-and-long-term-exercise-on-the-expression-of-arc-and-ampars-during-evolution-of-the-6-hydroxy-dopamine-animal-model-of-parkinson-s-disease
#15
P C Garcia, C C Real, L R Britto
The loss of nigral dopaminergic neurons typical in Parkinson's disease (PD) is responsible for hyperexcitability of medium spiny neurons resulting in abnormal corticostriatal glutamatergic synaptic drive. Considering the neuroprotective effect of exercise, the changes promoted by exercise on AMPA-type glutamate receptors (AMPARs), and the role of activity-regulated cytoskeleton-associated protein (Arc) in the AMPARs trafficking, we studied the impact of short and long-term treadmill exercise during evolution of the unilateral 6-hydroxy-dopamine (6-OHDA) animal model of PD...
April 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28236519/frequency-selective-alteration-in-the-resting-state-corticostriatal-thalamo-cortical-circuit-correlates-with-symptoms-severity-in-first-episode-drug-naive-patients-with-schizophrenia
#16
Shaoqiang Han, X Zong, M Hu, Yangyang Yu, Xiao Wang, Zhiliang Long, Yifeng Wang, Xiaogang Chen, Huafu Chen
Schizophrenia is a prototypical disorder of brain connectivity with altered neural activity in regions extending throughout the brain. Regions, including the subcortex and cortex, present activity mainly within a specific frequency band in resting-state. Whether these altered resting-state functional connections also present frequency specificity is unknown. In the present study, empirical mode decomposition, which is a pure data-driven method suitable for nonlinear and nonstationary signals, was used to decompose blood-oxygen-level-dependent (BOLD) signals into different intrinsic frequency bands...
February 21, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28228252/complete-disruption-of-the-kainate-receptor-gene-family-results-in-corticostriatal-dysfunction-in-mice
#17
Jian Xu, John J Marshall, Herman B Fernandes, Toshihiro Nomura, Bryan A Copits, Daniele Procissi, Susumu Mori, Lei Wang, Yongling Zhu, Geoffrey T Swanson, Anis Contractor
Kainate receptors are members of the glutamate receptor family that regulate synaptic function in the brain. They modulate synaptic transmission and the excitability of neurons; however, their contributions to neural circuits that underlie behavior are unclear. To understand the net impact of kainate receptor signaling, we generated knockout mice in which all five kainate receptor subunits were ablated (5ko). These mice displayed compulsive and perseverative behaviors, including over-grooming, as well as motor problems, indicative of alterations in striatal circuits...
February 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/28225752/prefrontal-cortex-output-circuits-guide-reward-seeking-through-divergent-cue-encoding
#18
James M Otis, Vijay M K Namboodiri, Ana M Matan, Elisa S Voets, Emily P Mohorn, Oksana Kosyk, Jenna A McHenry, J Elliott Robinson, Shanna L Resendez, Mark A Rossi, Garret D Stuber
The prefrontal cortex is a critical neuroanatomical hub for controlling motivated behaviours across mammalian species. In addition to intra-cortical connectivity, prefrontal projection neurons innervate subcortical structures that contribute to reward-seeking behaviours, such as the ventral striatum and midline thalamus. While connectivity among these structures contributes to appetitive behaviours, how projection-specific prefrontal neurons encode reward-relevant information to guide reward seeking is unknown...
February 22, 2017: Nature
https://www.readbyqxmd.com/read/28223037/asymmetric-dopaminergic-degeneration-and-levodopa-alter-functional-corticostriatal-connectivity-bilaterally-in-experimental-parkinsonism
#19
Cyril Monnot, Xiaoqun Zhang, Sahar Nikkhou-Aski, Peter Damberg, Per Svenningsson
Asymmetric dopamine loss is commonly found in early Parkinson's disease (PD), but its effects on functional networks have been difficult to delineate in PD patients because of variations in age, disease duration and therapy. Here we used unilateral 6-hydroxydopamine-lesioned (6-OHDA) rats and controls and treated them with a single intraperitoneal injection of levodopa (L-DOPA) before performing diffusion weighted MRI and resting state functional MRI (rs-fMRI). In accordance with a neurodegeneration of the nigrostriatal dopaminergic pathway, diffusion tensor imaging showed increased radial diffusivity and decreased fractional anisotropy in the lesioned substantia nigra...
February 20, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28202664/lrrk2-mouse-models-dissecting-the-behavior-striatal-neurochemistry-and-neurophysiology-of-pd-pathogenesis
#20
REVIEW
Mattia Volta, Heather Melrose
Mutations in leucine-rich repeat kinase 2 (LRRK2) are the most common genetic cause of familial Parkinson's disease (PD), resembling the sporadic disorder. Intensive effort has been directed toward LRRK2 mouse modeling and investigation, aimed at reproducing the human disease to inform mechanistic studies of pathogenesis and design of neuroprotective therapies. The physiological function of LRRK2 is still under exploration, but a clear role in striatal neurophysiology and animal behavior has emerged. Alterations in LRRK2 impair dopamine (DA) transmission, regulation and signaling, in addition to corticostriatal synaptic plasticity...
February 8, 2017: Biochemical Society Transactions
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