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https://www.readbyqxmd.com/read/28821120/enhanced-permeability-and-antifouling-performance-of-cellulose-acetate-ultrafiltration-membrane-assisted-by-l-dopa-functionalized-halloysite-nanotubes
#1
REVIEW
Keguang Mu, Dalun Zhang, Ziqiang Shao, Dujian Qin, Yalong Wang, Shuo Wang
l-Dopa functionalized halloysite nanotubes (HNTs) were prepared by the self-polymerization of l-dopa in the weak alkaline condition. Then different contents of l-dopa coated HNTs (LPDHNTs) were blended into cellulose acetate to prepare enhanced performance ultrafiltration membranes via the phase inversion method. The HNTs and LPDHNTs were characterized by FTIR, XPS, and TEM anysis. And the membranes morphologies, separation performance, antifouling performance, mechanical properties and hydrophilicity were also investigated...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28819676/granger-causality-supports-abnormal-functional-connectivity-of-beta-oscillations-in-the-dorsolateral-striatum-and-substantia-nigra-pars-reticulata-in-hemiparkinsonian-rats
#2
Qiang Wang, Min Li, Zhengyuan Xie, Junbin Cai, Nanxiang Li, Hu Xiao, Ning Wang, Jinyan Wang, Fei Luo, Wangming Zhang
Synchronized oscillatory neuronal activity in the beta frequency range has been reported in the basal ganglia (BG) of patients with Parkinson disease (PD) and PD animal models. The coherent abnormal oscillatory activities in the dorsolateral striatum (dStr) and substantia nigra pars reticulata (SNr) that accompany parkinsonian states have not been resolved. In this study, we recorded local field potentials (LFPs) in the dStr and SNr of 6-hydroxydopamine (6-OHDA)-induced dopamine (DA)-lesioned rats in an awake, resting state...
August 17, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28812048/sensorimotor-rhythm-neurofeedback-as-adjunct-therapy-for-parkinson-s-disease
#3
Ingrid H C H M Philippens, Jacqueline A Wubben, Raymond A P Vanwersch, Dave L Estevao, Peter A Tass
Neurofeedback may enhance compensatory brain mechanisms. EEG-based sensorimotor rhythm neurofeedback training was suggested to be beneficial in Parkinson's disease. In a placebo-controlled study in parkinsonian nonhuman primates we here show that sensorimotor rhythm neurofeedback training reduces MPTP-induced parkinsonian symptoms and both ON and OFF scores during classical L-DOPA treatment. Our findings encourage further development of sensorimotor rhythm neurofeedback training as adjunct therapy for Parkinson's disease which might help reduce L-DOPA-induced side effects...
August 2017: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/28806258/recurrent-scapular-metastasis-from-hepatoblastoma-shown-on-fdg-pet-ct-and-f-dopa-pet-ct
#4
Bing Zhang, Qiao He, Xinchong Shi, Xiaoyan Wang, Xiangsong Zhang
We report the case of a 4-year-old girl with a biochemical relapse (plasma α-fetoprotein of 57,987.6 μg/L) after hepatoblastoma and extrahepatic metastases removal and adjuvant chemotherapy. Abdominal ultrasound, CT, and MRI failed to determine the site of recurrence. F-FDG PET/CT showed increased activity in the region of left scapula and adjacent soft tissue, which was incorrectly interpreted as the postoperative repair or inflammatory change. F-DOPA PET/CT showed increased activity and noticeable progressed lesion in the same place...
August 12, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28798227/novel-pet-tracer-68-ga-dotatate-pet-ct-can-be-alternative-imaging-method-in-patients-with-insulinomas
#5
Şadiye Altun Tuzcu, Zafer Pekkolay, Faruk Kılınç, Alpaslan Kemal Tuzcu
Insulinomas are the most common cause of hypoglycemia resulting from endogenous hyperinsulinism. The diagnosis of insulinoma is established by demonstrating inappropriately high serum insulin concentrations during a spontaneous or induced episode of hypoglycaemia. Most of the insulinomas are islet-cell tumors. They are often small (less than 2 cm), benign, and difficult to localize with current imaging techniques. The non-invasive procedures such as transabdominal ultrasonography, spiral computed tomography (CT), magnetic resonance imaging (MRI), 111-In-pentetreotide imaging, fluorine-18-L-dihydroxyphenylalanine positron emission tomography ((18)F-DOPA PET) and invasive procedures such as endoscopic ultrasonography or a selective arterial calcium stimulation test (SACST) with hepatic venous sampling can be used to show insulinomas...
August 10, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28772942/alizarin-red-s-confined-layer-by-layer-films-as-redox-active-coatings-on-electrodes-for-the-voltammetric-determination-of-l-dopa
#6
Shigehiro Takahashi, Iwao Suzuki, Tatsuro Sugawara, Masaru Seno, Daichi Minaki, Jun-Ichi Anzai
The preparation of redox-active coatings is a key step in fabricating electrochemical biosensors. To this goal, a variety of coating materials have been used in combination with redox-active compounds. In this study, alizarin red S (ARS) was confined in layer-by-layer (LbL) films composed of poly(ethyleneimine) (PEI) and carboxymethylcellulose (CMC) to study the redox properties. A gold (Au) disc electrode coated with PEI/CMC LbL film was immersed in an ARS solution to uptake ARS into the film. ARS was successfully confined in the LbL film through electrostatic interactions...
May 25, 2017: Materials
https://www.readbyqxmd.com/read/28769786/mild-inflammatory-profile-without-gliosis-in-the-c-rel-deficient-mouse-modeling-a-late-onset-parkinsonism
#7
Vanessa Porrini, Mariana Mota, Edoardo Parrella, Arianna Bellucci, Marina Benarese, Lara Faggi, Paolo Tonin, Pier F Spano, Marina Pizzi
The impact of neuroinflammation and microglial activation to Parkinson's disease (PD) progression is still debated. Post-mortem analysis of PD brains has shown that neuroinflammation and microgliosis are key features of end-stage disease. However, microglia neuroimaging studies and evaluation of cerebrospinal fluid (CSF) cytokines in PD patients at earlier stages do not support the occurrence of a pronounced neuroinflammatory process. PD animal models recapitulating the motor and non-motor features of the disease, and the slow and progressive neuropathology, can be of great advantage in understanding whether and how neuroinflammation associates with the onset of symptoms and neuronal loss...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28761417/on-the-role-of-endogenous-neurotoxins-and-neuroprotection-in-parkinson-s-disease
#8
REVIEW
Juan Segura-Aguilar
For 50 years ago was introduced L-3,4-dihydroxyphenylalanine (L-dopa) in Parkinson's disease treatment and during this significant advances has been done but what trigger the degeneration of the nigrostriatal system remain unknown. There is a general agreement in the scientific community that mitochondrial dysfunction, protein degradation dysfunction, alpha-synuclein aggregation to neurotoxic oligomers, neuroinflammation, oxidative and endoplasmic reticulum stress are involved in the loss of dopaminergic neurons containing neuromelanin in Parkinson's disease...
June 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28759974/correlations-between-methionine-cycle-metabolism-comt-genotype-and-polyneuropathy-in-l-dopa-treated-parkinson-s-disease-a-preliminary-cross-sectional-study
#9
Mattias Andréasson, Lovisa Brodin, José Miguel Laffita-Mesa, Per Svenningsson
BACKGROUND: Polyneuropathy (pnp) is recognized as a clinical feature of Parkinson's disease (PD). Whether pnp is a result of the alpha-synucleinopathy or related to treatment is debated. Previous studies support underlying disturbances in the methionine cycle mediated by L-dopa. OBJECTIVE: Describe possible relationships between methionine cycle metabolism and the development of pnp in L-dopa treated PD. Furthermore, we aim to investigate possible genetic risk factors by genotyping specific SNPs in enzymes involved in the abovementioned pathways...
July 27, 2017: Journal of Parkinson's Disease
https://www.readbyqxmd.com/read/28757258/bdnf-over-expression-induces-striatal-serotonin-fiber-sprouting-and-increases-the-susceptibility-to-l-dopa-induced-dyskinesia-in-6-ohda-lesioned-rats
#10
Elisabetta Tronci, Francesco Napolitano, Ana Muñoz, Camino Fidalgo, Francesca Rossi, Anders Björklund, Alessandro Usiello, Manolo Carta
In addition to its role in neuronal survival, the brain neurotrophic factor (BDNF) has been shown to influence serotonin transmission and synaptic plasticity, events strongly implicated in the appearance of l-DOPA-induced dyskinesia (LID), a motor complication occurring in parkinsonian patients after long-term treatment with the dopamine precursor. In order to evaluate a possible influence of BDNF in the appearance of LID, 6-OHDA-lesioned rats received a striatal injection of different concentrations of an adeno-associated viral (AAV) vector over-expressing either BDNF or GFP, as control vector...
July 27, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28757247/l-dopa-inhibits-excitatory-synaptic-transmission-in-the-rat-nucleus-tractus-solitarius-through-release-of-dopamine
#11
Y Ohi, D Kodama, A Haji
The mode of action of L-DOPA on excitatory synaptic transmission in second-order neurons of the nucleus tractus solitarius (NTS) was studied using the rat brainstem slices. Superfusion of L-DOPA (10μM) reduced the frequency of miniature excitatory postsynaptic currents (mEPSCs) without any effect on the amplitude. A low concentration (1μM) was ineffective on the mEPSCs, and the highest concentration (100μM) exerted a stronger inhibitory effect. L-DOPA (10μM) decreased the amplitude of EPSCs (eEPSCs) evoked by electrical stimulation of the tractus solitarius and increased the paired-pulse ratio...
July 28, 2017: Neuroscience
https://www.readbyqxmd.com/read/28755172/micro-lesion-effect-of-the-globus-pallidus-internus-with-deep-brain-stimulation-in-parkinson-s-disease-patients
#12
Yi Wang, Peng Li, FeiLong Gong, Yuan Gao, Yang Y Xu, Wei Wang
BACKGROUND: The micro-lesion effect (MLE) has been observed in many Parkinson's disease (PD) patients after deep brain stimulation (DBS) surgery. For subthalamic nucleus (STN) stimulation, the MLE has been reported as a predictor of the long-term efficacy of DBS. However, the research on the MLE in the globus pallidus internus (GPi) is insufficient. In this report, we conducted a study of the correlation between the MLE and improvement of GPi DBS. METHODS: From July 2014 to November 2015, 36 PD patients underwent GPi DBS in our hospital...
July 28, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28751195/antinociceptive-antiallodynic-and-antihyperalgesic-effects-of-the-5-ht1a-receptor-selective-agonist-nlx-112-in-mouse-models-of-pain
#13
Kinga Sałat, Marcin Kołaczkowski, Anna Furgała, Adriana Rojek, Joanna Śniecikowska, Mark A Varney, Adrian Newman-Tancredi
BACKGROUND AND PURPOSE: NLX-112 (a.k.a. befiradol, F13640) is a drug candidate intended for the treatment of l-DOPA-induced dyskinesia. It is a highly selective serotonin 5-HT1A receptor full agonist which has been previously tested in a variety of models of CNS effects including analgesic activity in rat. Its activity in mouse models of pain has not been previously investigated. EXPERIMENTAL APPROACH: The activity of NLX-112 was tested in mouse models of acute pain (hot plate), tonic pain (intraplantar formalin test), in the oxaliplatin-induced neuropathic pain model of chemotherapy-induced peripheral neuropathy and in the streptozotocin (STZ)-induced model of painful diabetic neuropathy...
July 24, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28751068/dopa-decarboxylase-modulates-tau-toxicity
#14
Rebecca L Kow, Carl Sikkema, Jeanna M Wheeler, Charles W Wilkinson, Brian C Kraemer
BACKGROUND: The microtubule-associated protein tau accumulates into toxic aggregates in multiple neurodegenerative diseases. We found previously that loss of D2-family dopamine receptors ameliorated tauopathy in multiple models including a Caenorhabditis elegans model of tauopathy. METHODS: To better understand how loss of D2-family dopamine receptors can ameliorate tau toxicity, we screened a collection of C. elegans mutations in dopamine-related genes (n = 45) for changes in tau transgene-induced behavioral defects...
June 15, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28750831/potential-role-of-tyrosine-hydroxylase-in-the-loss-of-psychostimulant-effect-of-amphetamine-under-conditions-of-impaired-dopamine-transporter-activity
#15
Egle Janenaite, Valentina Vengeliene, Anton Bespalov, Berthold Behl
Amphetamine and methylphenidate are known to have stimulatory effect in healthy subjects but not in humans with attention deficit hyperactivity disorder and in rodents with impaired dopamine transporter (DAT) function. This phenomenon is called the paradoxical calming effect of psychostimulants. It has been previously demonstrated that psychostimulants may regulate the enzymatic activity of tyrosine hydroxylase (TH). Hence, the objective of the present study was to determine whether the lack of activity-stimulating effects of amphetamine in hyperactive rats is associated with changes in TH activity...
July 24, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28747449/loss-of-cutaneous-large-and-small-fibers-in-naive-and-l-dopa-treated-pd-patients
#16
Maria Nolano, Vincenzo Provitera, Fiore Manganelli, Rosa Iodice, Annamaria Stancanelli, Giuseppe Caporaso, Annamaria Saltalamacchia, Francesca Califano, Bernardo Lanzillo, Marina Picillo, Paolo Barone, Lucio Santoro
OBJECTIVE: To study small and large fiber pathology in drug-naive and l-dopa-treated patients affected by Parkinson disease (PD) in early phases, before the occurrence of neuropathic electrophysiologic abnormalities. METHODS: We enrolled 85 patients with idiopathic PD (male/female 49/36, age 61.3 ± 9.7 years) without electrophysiologic signs of neuropathy, including 48 participants naive to l-dopa treatment. All patients underwent clinical, functional, and morphologic assessment of sensory and autonomic nerves through dedicated questionnaires, quantitative sensory testing, sympathetic skin response, dynamic sweat test, and punch biopsies from glabrous and hairy skin...
July 26, 2017: Neurology
https://www.readbyqxmd.com/read/28739086/a-preclinical-study-on-the-combined-effects-of-repeated-eltoprazine-and-preladenant-treatment-for-alleviating-l-dopa-induced-dyskinesia-in-parkinson-s-disease
#17
Wai Kin D Ko, Qin Li, Long Yun Cheng, Micaela Morelli, Manolo Carta, Erwan Bezard
Eltoprazine, a serotonergic (5-HT)1A/B receptor agonist, is a potential treatment for L-DOPA-induced dyskinesia (LID) in Parkinson's disease (PD) but notably compromises the anti-parkinsonian effects of L-DOPA, as seen in rodent and monkey models of PD. Preladenant, a selective adenosine A2a receptor antagonist, mediates modest anti-parkinsonian effects in parkinsonian monkeys. In a recent investigation, combined eltoprazine and preladenant treatment with a sub-threshold dose of L-DOPA acutely attenuated dyskinesia without exacerbating PD disability in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated macaques...
July 21, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28737225/psychostimulant-effect-of-dopaminergic-treatment-and-addictions-in-parkinson-s-disease
#18
Benoit Delpont, Eugénie Lhommée, Hélène Klinger, Emmanuelle Schmitt, Amélie Bichon, Valérie Fraix, Anna Castrioto, Jean-Louis Quesada, Pierre Pélissier, Andrea Kistner, Sébastien Carnicella, Christian Lüscher, Emmanuel Broussolle, Pierre Pollak, Stéphane Thobois, Paul Krack
BACKGROUND: Dopamine replacement therapy in PD has been associated with both behavioral addictions and dopamine addiction. OBJECTIVES: To investigate potential association between l-dopa induced neuropsychiatric fluctuations and addictions in PD. METHODS: A cohort of 102 patients with PD suffering from motor complications of l-dopa treatment was prospectively analyzed. We evaluated dopamine addiction, behavioral addictions, and neuropsychiatric fluctuations using the Ardouin scale of behavior in PD...
July 24, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28728675/increased-striatal-dopamine-synthesis-capacity-in-gambling-addiction
#19
Ruth J van Holst, Guillaume Sescousse, Lieneke K Janssen, Marcel Janssen, Anne S Berry, William J Jagust, Roshan Cools
BACKGROUND: The hypothesis that dopamine plays an important role in the pathophysiology of pathological gambling is pervasive. However, there is little to no direct evidence for a categorical difference between pathological gamblers and healthy control subjects in terms of dopamine transmission in a drug-free state. Here we provide evidence for this hypothesis by comparing dopamine synthesis capacity in the dorsal and ventral parts of the striatum in 13 pathological gamblers and 15 healthy control subjects...
June 16, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28728428/consequence-of-dopamine-d2-receptor-blockade-on-the-hyperphagic-effect-induced-by-cannabinoid-cb1-and-cb2-receptors-in-layers
#20
M Khodadadi, M Zendehdel, A Baghbanzadeh, V Babapour
1. Endocannabinoids (ECBs) and their receptors play a regulatory function on several physiological processes such as feed-intake behaviour, mainly in the brain. This study was carried out in order to investigate the effects of the dopaminergic D1 and D2 receptors on CB1/CB2 ECB receptor-induced hyperphagia in 3-h feed-deprived neonatal layer chickens. 2. A total of 8 experiments were designed to explore the interplay of these two modulatory systems on feed intake in neonatal chickens. In Experiment 1, chickens were intracerebroventricular (ICV) injected with control solution, l-DOPA (levo-dihydroxyphenylalanine as precursor of dopamine; 125 nmol), 2-AG (2-arachidonoylglycerol as CB1 receptor agonist; 2 µg) and co-administration of l-DOPA (125 nmol) plus 2-AG (2 µg)...
August 16, 2017: British Poultry Science
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