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https://www.readbyqxmd.com/read/28327638/conditional-deletion-of-ndufs4-in-dopaminergic-neurons-promotes-parkinson-s-disease-like-non-motor-symptoms-without-loss-of-dopamine-neurons
#1
Won-Seok Choi, Hyung-Wook Kim, François Tronche, Richard D Palmiter, Daniel R Storm, Zhengui Xia
Reduction of mitochondrial complex I activity is one of the major hypotheses for dopaminergic neuron death in Parkinson's disease. However, reduction of complex I activity in all cells or selectively in dopaminergic neurons via conditional deletion of the Ndufs4 gene, a subunit of the mitochondrial complex I, does not cause dopaminergic neuron death or motor impairment. Here, we investigated the effect of reduced complex I activity on non-motor symptoms associated with Parkinson's disease using conditional knockout (cKO) mice in which Ndufs4 was selectively deleted in dopaminergic neurons (Ndufs4 cKO)...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327600/dopamine-functionalized-tannic-acid-templated-mesoporous-silica-nanoparticles-as-a-new-sorbent-for-the-efficient-removal-of-cu-2-from-aqueous-solution
#2
Junkai Gao, Hao Lei, Zhi Han, Qian Shi, Yan Chen, Yanjun Jiang
A simple, environmentally friendly and cost-effective nonsurfactant template method was used to synthesize tannic-acid-templated mesoporous silica nanoparticles (TMSNs), and then dopamine functionalized TMSNs (Dop-TMSNs) which was synthesized by a facile and biomimetic coating strategy, was developed as a new sorbent for the removal of Cu(2+) from aqueous solution. The Dop-TMSNs were thoroughly characterized by SEM, TEM, BET, FT-IR and TGA, and the effects of contact time, initial pH, K(+) and Na(+) concentrations, co-existing polyvalent metal ions and adsorption-desorption cycle times on the sorption capacity of Dop-TMSNs were studied...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28326037/differences-on-brain-connectivity-in-adulthood-are-present-in-subjects-with-iron-deficiency-anemia-in-infancy
#3
Cecilia Algarin, Keerthana Deepti Karunakaran, Sussanne Reyes, Cristian Morales, Betsy Lozoff, Patricio Peirano, Bharat Biswal
Iron deficiency continues to be the most prevalent micronutrient deficit worldwide. Since iron is involved in several processes including myelination, dopamine neurotransmission and neuronal metabolism, the presence of iron deficiency anemia (IDA) in infancy relates to long-lasting neurofunctional effects. There is scarce data regarding whether these effects would extend to former iron deficient anemic human adults. Resting state functional magnetic resonance imaging (fMRI) is a novel technique to explore patterns of functional connectivity...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28326032/a-dynamic-circuit-hypothesis-for-the-pathogenesis-of-blepharospasm
#4
David A Peterson, Terrence J Sejnowski
Blepharospasm (sometimes called "benign essential blepharospasm," BEB) is one of the most common focal dystonias. It involves involuntary eyelid spasms, eye closure, and increased blinking. Despite the success of botulinum toxin injections and, in some cases, pharmacologic or surgical interventions, BEB treatments are not completely efficacious and only symptomatic. We could develop principled strategies for preventing and reversing the disease if we knew the pathogenesis of primary BEB. The objective of this study was to develop a conceptual framework and dynamic circuit hypothesis for the pathogenesis of BEB...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28326026/pre-clinical-studies-with-d-penicillamine-as-a-novel-pharmacological-strategy-to-treat-alcoholism-updated-evidences
#5
REVIEW
Alejandro Orrico, Lucía Martí-Prats, María J Cano-Cebrián, Luis Granero, Ana Polache, Teodoro Zornoza
Ethanol, as other drugs of abuse, is able to activate the ventral tegmental area dopamine (VTA-DA) neurons leading to positively motivational alcohol-seeking behavior and use, and, ultimately to ethanol addiction. In the last decades, the involvement of brain-derived acetaldehyde (ACD) in the ethanol actions in the mesolimbic pathway has been widely demonstrated. Consistent published results have provided a mechanistic support to the use of ACD inactivating agents to block the motivational and reinforcing properties of ethanol...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28325790/dopamine-terminals-from-the-ventral-tegmental-area-gate-intrinsic-inhibition-in-the-prefrontal-cortex
#6
William C Buchta, Stephen V Mahler, Benjamin Harlan, Gary S Aston-Jones, Arthur C Riegel
Spike frequency adaptation (SFA or accommodation) and calcium-activated potassium channels that underlie after-hyperpolarization potentials (AHP) regulate repetitive firing of neurons. Precisely how neuromodulators such as dopamine from the ventral tegmental area (VTA) regulate SFA and AHP (together referred to as intrinsic inhibition) in the prefrontal cortex (PFC) remains unclear. Using whole cell electrophysiology, we measured intrinsic inhibition in prelimbic (PL) layer 5 pyramidal cells of male adult rats...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28325490/development-and-application-of-a-new-in-line-coupling-of-a-miniaturized-boronate-affinity-monolithic-column-with-capillary-zone-electrophoresis-for-the-selective-enrichment-and-analysis-of-cis-diol-containing-compounds
#7
Maria Betzabeth Espina-Benitez, Jérôme Randon, Claire Demesmay, Vincent Dugas
An integrated, miniaturized and fully automated system was developed for the analysis (preconcentration/purification, separation and detection) of cis-diol containing molecules in complex matrices. This innovative in-line coupling system was achieved via the in-situ and localized synthesis of a short segment of silica-based monolith at the inlet of a 75-μm inner diameter fused silica capillary. The monolithic segment was locally functionalized with an acrylamide derivative of phenylboronic acid by free radical photopolymerization within 10min of irradiation time...
March 9, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28325154/the-behavioral-profile-of-methylenedioxypyrovalerone-mdpv-and-%C3%AE-pyrrolidinopentiophenone-pvp-a-systematic-review
#8
Cornel N Stanciu, Thomas M Penders, Samantha A Gnanasegaram, Elvin Pirapakaran, Juvraj S Padda, Jeeven S Padda
BACKGROUND: New psychoactive substances are emerging at an alarming rate. With novel structures and properties they produce unique behavioral characteristics during intoxication. Synthetic cathinones are some of the most common. More and more are presenting to emergency departments due to consequences of use. Aside from isolated reports, little is known about these compounds. OBJECTIVE: Here we review literature pertaining to two common synthetic cathinones, MDPV and alphaPVP, and correlate clinically with guidance on management of intoxications...
March 21, 2017: Current Drug Abuse Reviews
https://www.readbyqxmd.com/read/28325146/hypersexuality-as-a-neuropsychiatric-disorder-the-neurobiology-and-treatment-options
#9
Hatta Sidi, Muna Asiff, Jaya Kumar, Srijit Das, Nurul Hazwani Hatta, Cesar Alfonso
Hypersexuality refers to abnormally increased or extreme involvement in any sexual activity. It is clinically challenging, presents trans-diagnostically and there is extensive medical literature addressing nosology, pathogenesis and neuropsychiatric aspects. Classification includes deviant behaviours, diagnosable entities related to impulsivity, and obsessional phenomena. Some clinicians view an increase in sexual desire as 'normal' while psychodynamic theorists consider it ego-defensive at times alleviating unconscious anxiety rooted in intrapsychic conflicts...
March 21, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/28324454/reward-circuitry-in-addiction
#10
REVIEW
Sarah Cooper, A J Robison, Michelle S Mazei-Robison
Understanding the brain circuitry that underlies reward is critical to improve treatment for many common health issues, including obesity, depression, and addiction. Here we focus on insights into the organization and function of reward circuitry and its synaptic and structural adaptations in response to cocaine exposure. While the importance of certain circuits, such as the mesocorticolimbic dopamine pathway, are well established in drug reward, recent studies using genetics-based tools have revealed functional changes throughout the reward circuitry that contribute to different facets of addiction, such as relapse and craving...
March 21, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28324006/effects-of-season-and-estradiol-on-kndy-neuron-peptides-colocalization-with-d2-dopamine-receptors-and-dopaminergic-inputs-in-the-ewe
#11
Peyton Weems, Jeremy Smith, Iain J Clarke, Lique M Coolen, Robert L Goodman, Michael N Lehman
Seasonal reproduction in sheep is primarily due to a dramatic increase in the ability of estradiol (E2) to inhibit the pulsatile secretion of gonadotropin-releasing hormone (GnRH) during the non-breeding season (anestrus). Recent findings suggest that KNDy (kisspeptin/neurokinin B/dynorphin) neurons of the arcuate nucleus (ARC) play a key role in conveying this negative feedback influence, with dopaminergic projections from the retrochiasmatic area acting upon KNDy cells to decrease kisspeptin release and thus inhibit GnRH pulses...
January 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323108/chronic-methamphetamine-exposure-significantly-decreases-microglia-activation-in-the-arcuate-nucleus
#12
Steven A Lloyd, Beau Corkill, Matthew C Bruster, Rick L Roberts, Ryan A Shanks
Methamphetamine is a powerful psychostimulant drug and its use and abuse necessitates a better understanding of its neurobiobehavioral effects. The acute effects of binge dosing of methamphetamine on the neurons in the CNS are well studied. However, the long-term effects of chronic, low-dose methamphetamine are less well characterized, especially in other cell types and areas outside of the major dopamine pathways. Mice were administered 5mg/kg/day methamphetamine for ten days and brain tissue was analyzed using histochemistry and image analysis...
March 16, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/28322272/neuroanatomic-epigenetic-and-genetic-differences-in-monozygotic-twins-discordant-for-attention-deficit-hyperactivity-disorder
#13
Y-C Chen, G Sudre, W Sharp, F Donovan, S C Chandrasekharappa, N Hansen, L Elnitski, P Shaw
The study of monozygotic twins discordant for attention deficit hyperactivity disorder can elucidate mechanisms that contribute to the disorder, which affects ~7% of children. First, using in vivo neuroanatomic imaging on 14 pairs of monozygotic twins (mean age 9.7, s.d. 1.9 years), we found that discordance for the disorder is mirrored by differing dimensions of deep brain structures (the striatum and cerebellum), but not the cerebral cortex. Next, using whole-blood DNA from the same twins, we found a significant enrichment of epigenetic differences in genes expressed in these 'discordant' brain structures...
March 21, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28322190/activity-patterns-of-serotonin-neurons-underlying-cognitive-flexibility
#14
Sara Matias, Eran Lottem, Guillaume P Dugué, Zachary F Mainen
Serotonin is implicated in mood and affective disorders. However, growing evidence suggests that a core endogenous role is to promote flexible adaptation to changes in the causal structure of the environment, through behavioral inhibition and enhanced plasticity. We used long-term photometric recordings in mice to study a population of dorsal raphe serotonin neurons, whose activity we could link to normal reversal learning using pharmacogenetics. We found that these neurons are activated by both positive and negative prediction errors, and thus report signals similar to those proposed to promote learning in conditions of uncertainty...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28322171/dopaminergic-modulation-of-sleep-wake-states
#15
Andrea Herrera-Solís, Wendy Herrera-Morales, Luis Núñez-Jaramillo, Oscar Arias-Carrión
The role of dopamine in sleep-wake regulation is associated as a wakefulness-promoting agent. For the clinical treatment of excessive daytime sleepiness, drugs have been commonly used to increase dopamine release. However, sleep disorders or lack of sleep is related to several dopamine-related disorders. The effects of dopaminergic agents, nevertheless, are mediated by two families of dopamine receptors, D1 and D2-like receptors; the first family increases adenylyl cyclase activity and the second inhibits adenylyl cyclase...
March 20, 2017: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/28321605/long-term-effects-of-stimulant-exposure-on-cerebral-blood-flow-response-to-methylphenidate-and-behavior-in-attention-deficit-hyperactivity-disorder
#16
Anouk Schrantee, C Bouziane, E E Bron, S Klein, M A Bottelier, J J S Kooij, S A R B Rombouts, L Reneman
Stimulant prescription rates for attention deficit hyperactivity disorder (ADHD) are increasing, even though potential long-term effects on the developing brain have not been well-studied. A previous randomized clinical trial showed short-term age-dependent effects of stimulants on the DA system. We here assessed the long-term modifying effects of age-of-first-stimulant treatment on the human brain and behavior. 81 male adult ADHD patients were stratified into three groups: 1) early stimulant treatment (EST; <16 years of age) 2) late stimulant treatment (LST: ≥23 years of age) and 3) stimulant treatment naive (STN; no history of stimulant treatment)...
March 20, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28321600/post-6-ohda-lesion-exposure-to-stress-affects-neurotrophic-factor-expression-and-aggravates-motor-impairment
#17
Phumzile Nomfundo Ngema, Musa Vuyisile Mabandla
Chronic exposure to stress amplifies locomotor deficits and exacerbates dopamine neuron loss in an animal model for Parkinson's disease. The release of neurotrophic factors such as glial cell-line derived neurotrophic factor (GDNF) and neurotrophin-3 (NT-3) following neuronal injury attenuates exacerbated degeneration of these neurons. In this study, the neurotoxin 6-hydroxydopamine (6-OHDA) was injected unilaterally into the medial forebrain bundle of male Sprague Dawley rats. A subset of these rats was subjected to post-lesion restraint stress after which the effect of exposure to stress on locomotor activity (forelimb akinesia test), neurotrophic factor (GDNF and NT-3) and corticosterone concentration was assessed...
March 20, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28321131/does-activation-of-midbrain-dopamine-neurons-promote-or-reduce-feeding
#18
L Boekhoudt, T J M Roelofs, J W de Jong, A E de Leeuw, M C M Luijendijk, I G Wolterink-Donselaar, G van der Plasse, R A H Adan
BACKGROUND: Dopamine (DA) signalling in the brain is necessary for feeding behaviour, and alterations in the DA system have been linked to obesity. However, the precise role of DA in the control of food intake remains debated. On the one hand, food reward and motivation are associated with enhanced DA activity. On the other hand, psychostimulant drugs that increase DA signalling suppress food intake. This poses the questions of how endogenous DA neuronal activity regulates feeding, and whether enhancing DA neuronal activity would either promote or reduce food intake...
March 21, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28320195/combined-use-of-dopamine-transporter-imaging-dat-spect-and-123-i-metaiodobenzylguanidine-mibg-myocardial-scintigraphy-for-diagnosing-parkinson-s-disease
#19
Fumihito Yoshii, Masafuchi Ryo, Yasuhiko Baba, Takashi Koide, Jun Hashimoto
BACKGROUND: To examine whether combined use of (123)I-FP-CIT dopamine transporter single photon emission computed tomography (DAT-SPECT) and (123)I-MIBG myocardial scintigraphy (MIBG) is superior to either modality alone for diagnosing Parkinson's disease (PD). METHODS: Patients with probable PD (n=120) who underwent both DAT-SPECT and MIBG myocardial scintigraphy within short intervals were enrolled. Specific binding ratio (SBR) of DAT-SPECT images and heart-to-mediastinum (H/M) ratio of MIBG images were used as quantitative measures...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28319198/methamphetamine-induces-shati-nat8l-expression-in-the-mouse-nucleus-accumbens-via-creb-and-dopamine-d1-receptor-dependent-mechanism
#20
Kyosuke Uno, Toh Miyazaki, Kengo Sodeyama, Yoshiaki Miyamoto, Atsumi Nitta
Shati/Nat8L significantly increased in the nucleus accumbens (NAc) of mice after repeated methamphetamine (METH) treatment. We reported that Shati/Nat8L overexpression in mouse NAc attenuated METH-induced hyperlocomotion, locomotor sensitization, and conditioned place preference. We recently found that Shati/Nat8L overexpression in NAc regulates the dopaminergic neuronal system via the activation of group II mGluRs by elevated N-acetylaspartylglutamate following N-acetylaspartate increase due to the overexpression...
2017: PloS One
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