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raclopride AND "positron emission tomography"

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https://www.readbyqxmd.com/read/28916921/potential-effect-of-prolonged-sevoflurane-anesthesia-on-the-kinetics-of-11-c-raclopride-in-non-human-primates
#1
Ryosuke Arakawa, Lars Farde, Junya Matsumoto, Naoki Kanegawa, Igor Yakushev, Kai-Chun Yang, Akihiro Takano
PURPOSE: Positron emission tomography (PET) in non-human primates (NHP) is commonly performed under anesthesia, with sevoflurane being a widely used inhaled anesthetic. PET measurement in NHP can be repeated, and a difference in radioligand kinetics has previously been observed between the first and second PET measurement on the same day using sevoflurane anesthesia. In this study, we evaluated the effect of prolonged sevoflurane anesthesia on kinetics and binding potential (BPND) of [(11)C]raclopride in NHP...
September 15, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28878639/differential-associations-between-cortical-thickness-and-striatal-dopamine-in-treatment-na%C3%A3-ve-adults-with-adhd-vs-healthy-controls
#2
Mariya V Cherkasova, Nazlie Faridi, Kevin F Casey, Kevin Larcher, Gillian A O'Driscoll, Lily Hechtman, Ridha Joober, Glen B Baker, Jennifer Palmer, Alan C Evans, Alain Dagher, Chawki Benkelfat, Marco Leyton
Alterations in catecholamine signaling and cortical morphology have both been implicated in the pathophysiology of attention deficit/hyperactivity disorder (ADHD). However, possible links between the two remain unstudied. Here, we report exploratory analyses of cortical thickness and its relation to striatal dopamine transmission in treatment-naïve adults with ADHD and matched healthy controls. All participants had one magnetic resonance imaging (MRI) and two [(11)C]raclopride positron emission tomography scans...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28870407/striatal-dopamine-d2-3-receptor-mediated-neurotransmission-in-major-depression-implications-for-anhedonia-anxiety-and-treatment-response
#3
Marta Peciña, Magdalena Sikora, Erich T Avery, Joseph Heffernan, Susana Peciña, Brian J Mickey, Jon-Kar Zubieta
Dopamine (DA) neurotransmission within the brain's reward circuit has been implicated in the pathophysiology of depression and in both, cognitive and pharmacological mechanisms of treatment response. Still, a direct relationship between measures of DA neurotransmission and reward-related deficits in patients with depression has not been demonstrated. To gain insight into the symptom-specific alterations in the DA system in patients with depression, we used positron emission tomography (PET) and the D2/3 receptor-selective radiotracer [(11)C]raclopride in twenty-three non-smoking un-medicated Major Depressive Disorder (MDD) patients and sixteen healthy controls (HC)...
September 1, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28816243/dopamine-synthesis-capacity-is-associated-with-d2-3-receptor-binding-but-not-dopamine-release
#4
Anne S Berry, Vyoma D Shah, Daniella J Furman, Robert L White, Suzanne L Baker, James P O'Neil, Mustafa Janabi, Mark D'Esposito, William J Jagust
Positron Emission Tomography (PET) imaging allows the estimation of multiple aspects of dopamine function including dopamine synthesis capacity, dopamine release, and D2/3 receptor binding. Though dopaminergic dysregulation characterizes a number of neuropsychiatric disorders including schizophrenia and addiction, there has been relatively little investigation into the nature of relationships across dopamine markers within healthy individuals. Here we used PET imaging in 40 healthy adults to compare, within individuals, estimates of dopamine synthesis capacity (Ki) using 6-[(18)F]fluoro-l-m-tyrosine ([(18)F]FMT; a substrate for aromatic amino acid decarboxylase), baseline D2/3 receptor binding potential using [(11)C]raclopride (a weak competitive D2/3 receptor antagonist), and dopamine release using [(11)C]raclopride paired with oral methylphenidate administration...
August 17, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28769095/increased-dopamine-release-after-working-memory-updating-training-neurochemical-correlates-of-transfer
#5
Lars Bäckman, Otto Waris, Jarkko Johansson, Micael Andersson, Juha O Rinne, Kati Alakurtti, Anna Soveri, Matti Laine, Lars Nyberg
Previous work demonstrates that working-memory (WM) updating training results in improved performance on a letter-memory criterion task, transfers to an untrained n-back task, and increases striatal dopamine (DA) activity during the criterion task. Here, we sought to replicate and extend these findings by also examining neurochemical correlates of transfer. Four positron emission tomography (PET) scans using the radioligand raclopride were performed. Two of these assessed DAD2 binding (letter memory; n-back) before 5 weeks of updating training, and the same two scans were performed post training...
August 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28695985/intrastriatal-administration-of-botulinum-neurotoxin-a-normalizes-striatal-d2-r-binding-and-reduces-striatal-d1-r-binding-in-male-hemiparkinsonian-rats
#6
Franziska Wedekind, Angela Oskamp, Markus Lang, Alexander Hawlitschka, Karl Zilles, Andreas Wree, Andreas Bauer
Cerebral administration of botulinum neurotoxin A (BoNT-A) has been shown to improve disease-specific motor behavior in a rat model of Parkinson disease (PD). Since the dopaminergic system of the basal ganglia fundamentally contributes to motor function, we investigated the impact of BoNT-A on striatal dopamine receptor expression using in vitro and in vivo imaging techniques (positron emission tomography and quantitative autoradiography, respectively). Seventeen male Wistar rats were unilaterally lesioned with 6-hydroxydopamine (6-OHDA) and assigned to two treatment groups 7 weeks later: 10 rats were treated ipsilaterally with an intrastriatal injection of 1 ng BoNT-A, while the others received vehicle (n = 7)...
July 11, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28685616/cerebral-serotonin-release-correlates-with-11-c-az10419369-pet-measures-of-5-ht1b-receptor-binding-in-the-pig-brain
#7
Louise M Jørgensen, Pia Weikop, Claus Svarer, Ling Feng, Sune H Keller, Gitte M Knudsen
Positron emission tomography (PET) can, when used with appropriate radioligands, non-invasively capture temporal and spatial information about acute changes in brain neurotransmitter systems. We here evaluate the 5-HT1B receptor partial agonist PET radioligand, [(11)C]AZ10419369, for its sensitivity to detect changes in endogenous cerebral serotonin levels, as induced by different pharmacological challenges. To enable a direct translation of PET imaging data to changes in brain serotonin levels, we compared the [(11)C]AZ10419369 PET signal in the pig brain to simultaneous measurements of extracellular serotonin levels with microdialysis after various acute interventions (saline, escitalopram, fenfluramine)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28643800/striatal-dopamine-d2-d3-receptor-availability-varies-across-smoking-status
#8
Corinde E Wiers, Elizabeth A Cabrera, Dardo Tomasi, Christopher T Wong, Şükrü B Demiral, Sung Won Kim, Gene-Jack Wang, Nora D Volkow
To assess how tobacco smoking status affects baseline dopamine D2/D3 (D2R) receptor availability and methylphenidate-induced dopamine (DA) release, we retrospectively analyzed D2R availability measures of 8 current smokers, 10 ex-smokers, and 18 non-smokers who were scanned with Positron Emission Tomography and [(11)C]raclopride, after administration of an injection of placebo or 0.5 mg/kg iv methylphenidate. There was a significant effect of smoking status on baseline striatal D2R availability; with current smokers showing lower striatal D2R availability compared to non-smokers (caudate, putamen and ventral striatum) and to ex-smokers (caudate and putamen)...
June 23, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28583881/altered-adenosine-2a-and-dopamine-d2-receptor-availability-in-the-6-hydroxydopamine-treated-rats-with-and-without-levodopa-induced-dyskinesia
#9
X Zhou, J Doorduin, P H Elsinga, R A J O Dierckx, E F J de Vries, C Casteels
Several lines of evidence imply alterations in adenosine signaling in Parkinson's disease (PD). Here, we investigated cerebral changes in adenosine 2A receptor (A2AR) availability in 6-hydroxydopamine (6-OHDA)-lesioned rats with and without levodopa-induced dyskinesia (LID) using positron-emission tomography (PET) with [(11)C]preladenant. In parallel dopamine type 2 receptor (D2R) imaging with [(11)C]raclopride PET and behavioral tests for motor and cognitive function were performed. METHODS: Parametric A2AR and D2R binding potential (BPND) images were reconstructed using reference tissue models with midbrain and cerebellum as reference tissue, respectively...
June 2, 2017: NeuroImage
https://www.readbyqxmd.com/read/28572059/linking-dopaminergic-reward-signals-to-the-development-of-attentional-bias-a-positron-emission-tomographic-study
#10
Brian A Anderson, Hiroto Kuwabara, Dean F Wong, Joshua Roberts, Arman Rahmim, James R Brašić, Susan M Courtney
The attention system is shaped by reward history, such that learned reward cues involuntarily draw attention. Recent research has begun to uncover the neural mechanisms by which learned reward cues compete for attention, implicating dopamine (DA) signaling within the dorsal striatum. How these elevated priority signals develop in the brain during the course of learning is less well understood, as is the relationship between value-based attention and the experience of reward during learning. We hypothesized that the magnitude of the striatal DA response to reward during learning contributes to the development of a learned attentional bias towards the cue that predicted it, and examined this hypothesis using positron emission tomography with [(11)C]raclopride...
August 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/28507321/pet-imaging-of-dopamine-d2-receptor-internalization-in-schizophrenia
#11
J J Weinstein, E van de Giessen, R J Rosengard, X Xu, N Ojeil, G Brucato, R B Gil, L S Kegeles, M Laruelle, M Slifstein, A Abi-Dargham
Recent genetic, molecular and post-mortem studies suggest impaired dopamine (DA)-D2 receptor (D2R) trafficking in patients with schizophrenia (SZ). Imaging and preclinical studies have shown agonist-induced D2R internalization can be imaged with positron emission tomography (PET) using D2R radiotracers combined with psychostimulant challenge. This is feasible if radiotracer binding is measured when postchallenge DA levels have returned to baseline, following the initial competition phase between DA and radiotracer for binding to D2R...
May 16, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28493519/neurotransmitters-behind-pain-relief-with-transcranial-magnetic-stimulation-positron-emission-tomography-evidence-for-release-of-endogenous-opioids
#12
S Lamusuo, J Hirvonen, P Lindholm, I K Martikainen, N Hagelberg, R Parkkola, T Taiminen, J Hietala, S Helin, A Virtanen, A Pertovaara, S K Jääskeläinen
BACKGROUND: Repetitive transcranial magnetic stimulation (rTMS) at M1/S1 cortex has been shown to alleviate neuropathic pain. OBJECTIVES: To investigate the possible neurobiological correlates of cortical neurostimulation for the pain relief. METHODS: We studied the effects of M1/S1 rTMS on nociception, brain dopamine D2 and μ-opioid receptors using a randomized, sham-controlled, double-blinded crossover study design and 3D-positron emission tomography (PET)...
May 11, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28440810/naltrexone-modulates-dopamine-release-following-chronic-but-not-acute-amphetamine-administration-a-translational-study
#13
N Jayaram-Lindström, J Guterstam, J Häggkvist, M Ericson, T Malmlöf, B Schilström, C Halldin, S Cervenka, T Saijo, A-L Nordström, J Franck
The opioid antagonist naltrexone has been shown to attenuate the subjective effects of amphetamine. However, the mechanisms behind this modulatory effect are currently unknown. We hypothesized that naltrexone would diminish the striatal dopamine release induced by amphetamine, which is considered an important mechanism behind many of its stimulant properties. We used positron emission tomography and the dopamine D2-receptor radioligand [(11)C]raclopride in healthy subjects to study the dopaminergic effects of an amphetamine injection after pretreatment with naltrexone or placebo...
April 25, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28356473/density-of-available-striatal-dopamine-receptors-predicts-trait-impulsiveness-during-performance-of-an-attention-demanding-task
#14
Brian A Anderson, Hiroto Kuwabara, Dean F Wong, Susan M Courtney
The density (measured at binding potential) of available striatal D2/D3 receptors has been shown to predict trait impulsiveness. This relationship is highly robust and well replicated. In each case, however, the availability of dopamine receptors was measured at rest. More broadly, the extent to which relationships between dopamine receptor availability and behavioral traits hold when participants perform a cognitive task is unclear. Furthermore, the performance of a cognitive task engages fundamentally different neural networks than are maximally engaged during the resting state...
July 1, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28350401/systemic-inflammation-enhances-stimulant-induced-striatal-dopamine-elevation
#15
J R Petrulli, B Kalish, N B Nabulsi, Y Huang, J Hannestad, E D Morris
Changes in the mesolimbic dopamine (DA) system are implicated in a range of neuropsychiatric conditions including addiction, depression and schizophrenia. Dysfunction of the neuroimmune system is often comorbid with such conditions and affects similar areas of the brain. The goal of this study was to use positron emission tomography with the dopamine D2 antagonist tracer, (11)C-raclopride, to explore the effect of acute immune activation on striatal DA levels. DA transmission was modulated by an oral methylphenidate (MP) challenge in order to reliably elicit DA elevation...
March 28, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28346539/is-there-a-relation-between-novelty-seeking-striatal-dopamine-release-and-frontal-cortical-thickness
#16
Natalia Jaworska, Sylvia M Cox, Kevin F Casey, Isabelle Boileau, Mariya Cherkasova, Kevin Larcher, Alain Dagher, Chawki Benkelfat, Marco Leyton
BACKGROUND: Novelty-seeking (NS) and impulsive personality traits have been proposed to reflect an interplay between fronto-cortical and limbic systems, including the limbic striatum (LS). Although neuroimaging studies have provided some evidence for this, most are comprised of small samples and many report surprisingly large effects given the challenges of trying to relate a snapshot of brain function or structure to an entity as complex as personality. The current work tested a priori hypotheses about associations between striatal dopamine (DA) release, cortical thickness (CT), and NS in a large sample of healthy adults...
2017: PloS One
https://www.readbyqxmd.com/read/28254508/patterns-of-age-related-changes-for-phosphodiesterase-type-10a-in-comparison-with-dopamine-d2-3-receptors-and-sub-cortical-volumes-in-the-human-basal-ganglia-a-pet-study-with-18-f-mni-659-and-11-c-raclopride-with-correction-for-partial-volume-effect
#17
Patrik Fazio, Martin Schain, Ladislav Mrzljak, Nahid Amini, Sangram Nag, Nabil Al-Tawil, Cheryl J Fitzer-Attas, Juliana Bronzova, Bernhard Landwehrmeyer, Cristina Sampaio, Christer Halldin, Andrea Varrone
Phosphodiesterase 10A enzyme (PDE10A) is an important striatal target that has been shown to be affected in patients with neurodegenerative disorders, particularly Huntington´s disease (HD). PDE10A is expressed on striatal neurones in basal ganglia where other known molecular targets are enriched such as dopamine D2/3 receptors (D2/3 R). The aim of this study was to examine the availability of PDE10A enzyme in relation with age and gender and to compare those changes with those related to D2/3 R and volumes in different regions of the basal ganglia...
February 28, 2017: NeuroImage
https://www.readbyqxmd.com/read/28239334/micropet-outperforms-beta-microprobes-in-determining-neuroreceptor-availability-under-pharmacological-restriction-for-cold-mass-occupancy
#18
Dorien Glorie, Stijn Servaes, Jeroen Verhaeghe, Tine Wyckhuys, Leonie Wyffels, Olivier Vanderveken, Sigrid Stroobants, Steven Staelens
Both non-invasive micro-positron emission tomography (μPET) and in situ beta-microprobes have the ability to determine radiotracer kinetics and neuroreceptor availability in vivo. Beta-microprobes were proposed as a cost-effective alternative to μPET, but literature revealed conflicting results most likely due to methodological differences and inflicted tissue damage. The current study has three main objectives: (i) evaluate the theoretical advantages of beta-microprobes; (ii) perform μPET imaging to assess the impact of (beta-micro)probe implantation on relative tracer delivery (R1) and receptor occupancy (non-displaceable binding potential, BPND) in the rat brain; and (iii) investigate whether beta-microprobe recordings produce robust results when a pharmacological restriction for cold mass dose (tracer dose condition) is imposed...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28113619/direct-parametric-reconstruction-with-joint-motion-estimation-correction-for-dynamic-brain-pet-data
#19
Jieqing Jiao, Alexandre Bousse, Kris Thielemans, Ninon Burgos, Philip Weston, Pawel Markiewicz, Jonathan Schott, David Atkinson, Simon Arridge, Brian Hutton, Sebastien Ourselin
Direct reconstruction of parametric images from raw photon counts has been shown to improve the quantitative analysis of dynamic positron emission tomography (PET) data. However it suffers from subject motion which is inevitable during the typical acquisition time of 1-2 hours. In this work we propose a framework to jointly estimate subject head motion and reconstruct the motion-corrected parametric images directly from raw PET data, so that the effects of distorted tissue-to-voxel mapping due to subject motion can be reduced in reconstructing the parametric images with motion-compensated attenuation correction and spatially aligned temporal PET data...
August 24, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27981179/striatal-dopamine-d2-3-receptor-regulation-by-stress-inoculation-in-squirrel-monkeys
#20
Alex G Lee, Jordan M Nechvatal, Bin Shen, Christine L Buckmaster, Michael J Levy, Frederick T Chin, Alan F Schatzberg, David M Lyons
Intermittent mildly stressful situations provide opportunities to learn, practice, and improve coping in a process called stress inoculation. Stress inoculation also enhances cognitive control and response inhibition of impulsive motivated behavior. Cognitive control and motivation have been linked to striatal dopamine D2 and/or D3 receptors (DRD2/3) in rodents, monkeys, and humans. Here, we study squirrel monkeys randomized early in life to stress inoculation with or without maternal companionship and a no-stress control treatment condition...
June 2016: Neurobiology of Stress
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