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DAT transporter

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https://www.readbyqxmd.com/read/28938472/dopamine-neuron-restricted-leptin-receptor-lepr-signaling-reduces-some-aspects-of-food-reward-but-exacerbates-the-obesity-of-lepr-deficient-male-mice
#1
Maggie C Evans, Greg M Anderson
The contribution of leptin-induced modulation of dopamine neurons to feeding behavior and energy homeostasis remains unclear. Midbrain dopamine neurons regulate the reward value of food, and direct leptin administration to the midbrain reduces food intake. However, selective deletion of leptin receptors (Lepr) from dopamine neurons has no effect on body weight, food intake or hedonic responses, either suggesting leptin acts indirectly or demonstrating sufficient compensation occurs to mask any direct leptin-dopamine effects...
August 18, 2017: Endocrinology
https://www.readbyqxmd.com/read/28938220/metabolic-correlate-of-memory-deficit-awareness-in-dementia-with-lewy-bodies-implication-in-cortical-midline-structure
#2
Tomomichi Iizuka, Masashi Kameyama
The neural substrate of memory-deficit awareness has been studied in mild cognitive impairment and Alzheimer's disease (AD). However, little is known about that in dementia with Lewy bodies (DLB). To determine the neural substrates of memory-deficit awareness in DLB, we investigated the relationship between awareness of memory-deficit and glucose metabolism in DLB. Thirty-four patients with DLB were assessed by (18)F-FDG-PET and dopamine transporter (DAT)-SPECT. The awareness was evaluated using an awareness index that represents the discrepancy between objective and subjective memory scores...
September 13, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28931769/evaluation-of-early-phase-biodistribution-in-123-i-ioflupane-spect
#3
Masaki Takahashi, Shoichi Toki, Yukitaka Yamashita, Akihiro Kaneko
It is reported that pharmacokinetics after intravenous injection of (123)I-ioflupane may reflect cerebral blood flow. In this study, the early-phase pharmacokinetics of (123)I-ioflupane in 10 healthy volunteers was analyzed over time using dynamic single-photon emission computed tomography (SPECT) immediately after intravenous injection. We also examined the correlation between the (123)I-IMP imaging and the (123)I-ioflupane early-phase image for 14 cases in which both dopamine transporter (DaT) imaging by (123)I-ioflupane and cerebral blood flow imaging by (123)I-IMP were performed on the same camera...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28928221/upregulation-of-autophagy-related-gene-5-protects-dopaminergic-neurons-in-a-zebrafish-model-of-parkinson-s-disease
#4
Zhan-Ying Hu, Bo Chen, Jing-Pu Zhang, Yuan-Yuan Ma
Parkinson's disease (PD) is one of the most epidemic neurodegenerative diseases, and is characterized by movement disorders arising from loss of midbrain dopaminergic (DA) neurons. Recently, the relationship between PD and autophagy has received considerable attention, but information about the mechanisms involved is lacking. Here, we report that autophagy-related gene 5 (ATG5) is potentially important in protecting dopaminergic neurons in a 1-methyl-4phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced PD model in zebrafish...
September 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28925162/-effect-of-corydalis-rhizoma-and-l-tetrahydropalmatine-on-dopamine-system-of-hippocampus-and-striatum-in-morphine-induced-conditioned-place-preference-rats
#5
Shou-Yang Yu, Wei-Feng Bai, Ping Tu, Cheng-Kai Qiu, Pei-Run Yang, Su-Yuan Luo
To investigate the effects of Corydalis Rhizoma and L-tetrahydropalma-tine (L-THP) on the levels of dopamine neurotransmitter (DA), dopamine transporter (DAT) and the second dopamine receptor (D2R) in learning and memory-related brain areas, hippocampus and striatum, the DA, DAT and D2R were detected in conditioned place preference (CPP) rats suffered from morphine. And comparation the degree of similarity and consistency of the pharmacological effects was also studied. The rats were trained in black compartments and white ones (drug-paired compartment) with the increasing doses of morphine for 10 days (hypodermically injected from 10 mg•kg⁻¹ to 100 mg•kg⁻¹)...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28923595/attentional-deficits-and-altered-neuronal-activation-in-medial-prefrontal-and-posterior-parietal-cortices-in-mice-with-reduced-dopamine-transporter-levels
#6
Anita Cybulska-Klosowicz, Marta Laczkowska, Renata Zakrzewska, Aleksandra Kaliszewska
The executive control function of attention is regulated by the dopaminergic (DA) system. Dopamine transporter (DAT) likely plays a role in controlling the influence of DA on cognitive processes. We examined the effects of DAT depletion on cognitive processes related to attention. Mice with the DAT gene genetically deleted (DAT+/- heterozygotes) were compared to wild type (WT) mice on the Attentional Set-Shifting Task (ASST). Changes in neuronal activity during the ASST were shown with early growth response genes 1 and 2 (egr-1 and egr-2) immunohistochemistry in the medial prefrontal cortex (mPFC) and in the posterior parietal cortex (PPC)...
September 16, 2017: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/28922189/acr-acnm-practice-parameter-for-the-performance-of-dopamine-transporter-dat-single-photon-emission-computed-tomography-spect-imaging-for-movement-disorders
#7
Rathan M Subramaniam, Kirk A Frey, Christopher H Hunt, Gustavo A Mercier, Lilja B Solnes, Patrick M Colletti, Yang Lu, Bital Savir-Baruch, Hadyn T Williams
This American College of Radiology and American College of Nuclear Medicine joint clinical practice parameter is for performance of dopamine transporter single photon emission computed tomography (SPECT) imaging, for patients with movement disorders. Parkinsonian syndrome (PS) consists of a group of neurodegenerative diseases including Parkinson disease (PD), progressive supranuclear palsy (PSP), multiple system atrophy (MSA), corticobasal degeneration (CBD), and dementia with Lewy bodies (DLB). Accurate diagnosis of PS is critical for clinical management...
September 15, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28922168/evaluation-of-rna-blood-biomarkers-in-individuals-at-risk-of-parkinson-s-disease
#8
Jose A Santiago, Judith A Potashkin
BACKGROUND: Substantial progress has been made in the discovery of blood biomarkers for Parkinson's disease (PD), a progressive neurodegenerative disease that affects more than 4 million worldwide. Olfactory dysfunction and dopamine deficits usually precede motor symptoms years before the onset of PD. A readily accessible biomarker useful for identifying patients at risk of PD is expected to accelerate clinical trials. OBJECTIVE: To evaluate previously identified PD blood RNA biomarkers in a cohort of asymptomatic individuals at risk of PD...
September 11, 2017: Journal of Parkinson's Disease
https://www.readbyqxmd.com/read/28921596/single-cocaine-exposure-does-not-alter-striatal-presynaptic-dopamine-function-in-mice-an-18-f-fdopa-pet-study
#9
D R Bonsall, M Kokkinou, M Veronese, C Coello, L A Wells, O D Howes
Cocaine is a recreational drug of abuse that binds to the dopamine transporter (DAT), preventing reuptake of dopamine into presynaptic terminals. The increased presence of synaptic dopamine results in stimulation of both pre- and postsynaptic dopamine receptors, considered an important mechanism by which cocaine elicits its reinforcing properties. However, the effects of acute cocaine administration on presynaptic dopamine function remain unclear. Non-invasive imaging techniques such as positron emission tomography (PET) have revealed impaired presynaptic dopamine function in chronic cocaine users...
September 18, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28913731/inter-and-intra-observer-reproducibility-of-quantitative-analysis-for-fp-cit-spect-in-patients-with-dlb
#10
Atsutaka Okizaki, Michihiro Nakayama, Kaori Nakajima, Takayuki Katayama, Takahiro Uno, Fumiyoshi Morikawa, Juichiro Naoe, Koji Takahashi
BACKGROUND: Dopamine transporter single photon emission CT (DAT-SPECT) is useful in the evaluation of dementia with Lewy bodies (DLB). The specific binding ratio (SBR) is an index to measure DAT density. However, poorly reproducible cases are occasionally experienced in clinical practice. We hypothesized that distance-weighted histogram (DWH) may be useful to improve the reproducibility of SBR. The purpose of this study was to investigate inter- and intra-observer reproducibility of SBR with conventional and DWH methods, and to visually evaluate the precision in reference voxel of interest (VOI) definition using these methods...
September 14, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28912301/early-onset-drug-induced-parkinsonism-after-exposure-to-offenders-implies-nigrostriatal-dopaminergic-dysfunction
#11
Seok Jong Chung, Han Soo Yoo, Hyojeong Moon, Jungsu S Oh, Jae Seung Kim, Yong Hee Park, Jin Yong Hong, Byoung Seok Ye, Young H Sohn, Phil Hyu Lee
OBJECTIVES: The onset of parkinsonism in patients with drug-induced parkinsonism (DIP) exhibits extensive individual variability following exposure to offending drugs. We investigated whether the individual variations in the onset time of parkinsonism reflected the underlying subtle dopaminergic dysfunction in DIP. METHODS: We enrolled 71 patients with DIP who had visually normal striatal dopamine transporter (DAT) availability in (18)F-FP-CIT positron emission tomography scans...
September 14, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28905875/structural-and-functional-characterization-of-the-interaction-of-snapin-with-the-dopamine-transporter-differential-modulation-of-psychostimulant-actions
#12
Amaia M Erdozain, Stéphanie De Gois, Véronique Bernard, Victor Gorgievski, Nicolas Pietrancosta, Sylvie Dumas, Carlos E Macedo, Peter Vanhoutte, Jorge E Ortega, J Javier Meana, Eleni T Tzavara, Vincent Vialou, Bruno Giros
The importance of dopamine (DA) neurotransmission is emphasized by its direct implication in several neurological and psychiatric disorders. The DA transporter (DAT), target of psychostimulant drugs, is the key protein that regulates spatial and temporal activity of DA in the synaptic cleft via the rapid reuptake of DA into the presynaptic terminal. There is strong evidence suggesting that DAT-interacting proteins may play a role in its function and regulation. Performing a yeast-2-hybrid screening, we identified snapin, a SNARE-associated protein implicated in synaptic transmission, as a new binding partner of the carboxyl terminal of DAT...
September 14, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28899958/serotonin-transporter-binding-and-anxiety-symptoms-in-parkinson-s-disease
#13
Merijn Joling, Odile A van den Heuvel, Henk W Berendse, Jan Booij, Chris Vriend
BACKGROUND: Anxiety is a common neuropsychiatric symptom in Parkinson's disease (PD), yet the neural mechanisms have been scarcely investigated. Disturbances in dopaminergic and serotonergic signalling may play a role in its pathophysiology. (123)I-N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-iodophenyl)nortropane ((123)I-FP-CIT) is a single-photon emission CT radiotracer, and its binding in striatal and extrastriatal subcortical brain areas represents predominant binding to the presynaptic dopamine transporter (DAT) and the serotonin transporter (SERT), respectively...
September 12, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28894302/g%C3%AE-%C3%AE-subunit-activation-promotes-dopamine-efflux-through-the-dopamine-transporter
#14
J Garcia-Olivares, T Baust, S Harris, P Hamilton, A Galli, S G Amara, G E Torres
The dopamine transporter (DAT) is an important regulator of brain dopamine (DA) homeostasis, controlling the intensity and duration of DA signaling. DAT is the target for psychostimulants-like cocaine and amphetamine-and plays an important role in neuropsychiatric disorders, including attention-deficit hyperactivity disorder and drug addiction. Thus, a thorough understanding of the mechanisms that regulate DAT function is necessary for the development of clinical interventions to treat DA-related brain disorders...
September 12, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28883047/intrinsic-exercise-capacity-in-rats-influences-dopamine-neuroplasticity-induced-by-physical-training
#15
Patricia C R Rabelo, Nayara Abreu Coelho Horta, Letícia Maria Souza Cordeiro, Maristela O Poletini, Cândido Celso Coimbra, Raphael Escorsim Szawka, Danusa Dias Soares
The study evaluates whether the intrinsic capacity for physical exercise influences dopamine neuroplasticity induced by physical training. Male rats were submitted to 3 progressive tests until fatigue. Based on the maximal time of exercise (TE), rats were considered as low-performance (LP), standard-performance (SP) or high-performance (HP) to exercise. Eight animals from each group (LP, SP and HP) were randomly subdivided in sedentary (SED) or trained (TR). Physical training was performed during six weeks...
September 7, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28878626/map-kinase-phosphatase-3-mkp3-preserves-norepinephrine-transporter-activity-by-modulating-erk1-2-kinase-mediated-gene-expression
#16
Ole V Mortensen, Mads B Larsen, Susan G Amara
The norepinephrine transporter (NET) mediates the clearance of norepinephrine (NE) from the extracellular space and is a target of therapeutic antidepressants and psychostimulants. Previously we identified a MAP kinase phosphatase 3 (MKP3), as an important modulator of protein kinase C (PKC) mediated internalization of the related dopamine transporter (DAT). Here we show that MKP3 decreases PKC-mediated down regulation of NET expressed in PC12 cells. We demonstrate that this process involves a PKC-stimulated decrease of NET surface expression that is dependent on dynamin...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28859474/aggregated-single-walled-carbon-nanotubes-absorb-and-deform-dopamine-related-proteins-based-on-molecular-dynamics-simulations
#17
Yi Yu, Huiyong Sun, Keith Gilmore, Tingjun Hou, Suidong Wang, Youyong Li
Single-walled carbon nanotubes (SWCNTs) have attracted considerable attention owing to their applications in various fields such as biotechnology and biomedicine. Recently, aggregated SWCNTs have shown more significant effects on the treatment of methamphetamine addiction (Nat. Nanotech. 2016, 11, 613). However, the mechanisms underlying these actions are unclear. By using all-atom molecular dynamics simulations, we investigate the effects of single and aggregated SWCNTs (single-(10,10)CNT, aggregated-7-(10,10)CNTs, and single-(35,35)CNT with the same diameter as that of the aggregated one) on the activity of dopamine-related proteins [tyrosine hydroxylase (TyrOH) and dopamine transporter (DAT), which are related to the synthesis and transport of dopamine, respectively]...
September 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28855580/attentional-control-in-adolescent-mice-assessed-with-a-modified-five-choice-serial-reaction-time-task
#18
Mariasole Ciampoli, Gabriella Contarini, Maddalena Mereu, Francesco Papaleo
Adolescence is a critical period for the development of higher-order cognitive functions. Unlike in humans, very limited tools are available to assess such cognitive abilities in adolescent rodents. We implemented a modified 5-Choice Serial Reaction Time Task (5CSRTT) to selectively measure attentiveness, impulsivity, broad monitoring, processing speed and distractibility in adolescent mice. 21-day old C57BL/6J mice reliably acquired this task with no sex-dependent differences in 10-12 days. A protocol previously used in adults was less effective to assess impulsiveness in adolescents, but revealed increased vulnerability in females...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28844804/dat-spect-may-have-diagnostic-value-in-prodromal-sca2-patients-with-parkinsonism
#19
Noriyuki Miyaue, Satoshi Tada, Rina Ando, Hirotaka Iwaki, Hayato Yabe, Noriko Nishikawa, Masahiro Nagai, Hiroshi Takashima, Masahiro Nomoto
INTRODUCTION: Although spinocerebellar ataxia type 2 (SCA2) is classified as hereditary spinocerebellar degeneration, some patients present with parkinsonism before developing cerebellar ataxia. METHODS: (123)I-metaiodobenzyl guanidine ((123)I-MIBG) myocardial scintigraphy and/or dopamine transporter single photon emission computed tomography (DAT SPECT) using (123)I-ioflupane ((123)I-FP-CIT) were performed for the six patients from three SCA2 families. RESULTS: (123)I-MIBG myocardial scintigraphy showed reduced cardiac uptake in four of five patients and an association with Lewy body disease was suggested...
August 14, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28842414/the-atypical-map-kinase-swip-13-erk8-regulates-dopamine-transporters-through-a-rho-dependent-mechanism
#20
Daniel P Bermingham, J Andrew Hardaway, Osama Refai, Christian R Marks, Sam L Snider, Sarah M Sturgeon, William C Spencer, Roger J Colbran, David M Miller, Randy D Blakely
The neurotransmitter dopamine (DA) regulates multiple behaviors across phylogeny, with disrupted DA signaling in humans associated with addiction, attention-deficit/hyperactivity disorder (ADHD), schizophrenia, and Parkinson's disease. The DA transporter (DAT) imposes spatial and temporal limits on DA action, and provides for presynaptic DA recycling to replenish neurotransmitter pools. Molecular mechanisms that regulate DAT expression, trafficking and function, particularly in vivo, remain poorly understood, though recent studies have implicated Rho-linked pathways in psychostimulant action...
August 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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