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https://www.readbyqxmd.com/read/28526609/effects-of-l-dopa-benserazide-co-treatment-on-colonic-excitatory-cholinergic-motility-and-enteric-inflammation-following-dopaminergic-nigrostriatal-neurodegeneration
#1
C Pellegrini, L Antonioli, R Colucci, E Tirotta, D Gentile, C Ippolito, C Segnani, G Levandis, S Cerri, R F Blandini, E Barocelli, V Ballabeni, N Bernardini, C Blandizzi, M Fornai
INTRODUCTION: The mainstay therapy for Parkinson's disease (PD) relies on L-3,4- dihydroxyphenylalanine (L-DOPA) plus a DOPA-decarboxylase inhibitor. However, their effects on colonic dysmotility and inflammation observed in PD are undetermined. This study examined the effects of L-DOPA plus benserazide (BE) on colonic motility and inflammation in rats with central nigrostriatal dopaminergic denervation. METHODS: Neurodegeneration was induced by 6-hydroxydopamine (6-OHDA) injection into the median forebrain bundle (MFB)...
May 16, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28526514/levodopa-has-primarily-negative-influences-on-postural-control-in-patients-with-parkinson-s-disease
#2
Cédrick T Bonnet, Arnaud Delval, Sébastien Szaffarczyk, Luc Defebvre
Patients with Parkinson's disease have better functional status and motor performance under on-drug conditions. However, the administration of levodopa leads to greater postural sway. The present study's primary objective was to determine whether this on-drug problem may be related to a lack of adjustment in postural control mechanisms and body segment rotations. Fourteen patients with Parkinson's disease and 14 controls performed two gaze-shift tasks (40° to the left and 40° to the right, at 0.125 and 0...
May 16, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28521136/dopamine-depletion-impairs-bilateral-sensory-processing-in-the-striatum-in-a-pathway-dependent-manner
#3
M Ketzef, G Spigolon, Y Johansson, A Bonito-Oliva, G Fisone, G Silberberg
Parkinson's disease (PD) is a movement disorder caused by the loss of dopaminergic innervation, particularly to the striatum. PD patients often exhibit sensory impairments, yet the underlying network mechanisms are unknown. Here we examined how dopamine (DA) depletion affects sensory processing in the mouse striatum. We used the optopatcher for online identification of direct and indirect pathway projection neurons (MSNs) during in vivo whole-cell recordings. In control mice, MSNs encoded the laterality of sensory inputs with larger and earlier responses to contralateral than ipsilateral whisker deflection...
May 17, 2017: Neuron
https://www.readbyqxmd.com/read/28515689/current-experimental-studies-of-gene-therapy-in-parkinson-s-disease
#4
REVIEW
Jing-Ya Lin, Cheng-Long Xie, Su-Fang Zhang, Weien Yuan, Zhen-Guo Liu
Parkinson's disease (PD) was characterized by late-onset, progressive dopamine neuron loss and movement disorders. The progresses of PD affected the neural function and integrity. To date, most researches had largely addressed the dopamine replacement therapies, but the appearance of L-dopa-induced dyskinesia hampered the use of the drug. And the mechanism of PD is so complicated that it's hard to solve the problem by just add drugs. Researchers began to focus on the genetic underpinnings of Parkinson's disease, searching for new method that may affect the neurodegeneration processes in it...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28511367/neurobehavioural-changes-in-a-hemiparkinsonian-rat-model-induced-by-rotenone
#5
REVIEW
Sukala Puthuparambil Maniyath, Narayanan Solaiappan, Muthusamy Rathinasamy
INTRODUCTION: Rotenone, a mitochondrial complex I inhibitor is used as a neurotoxin agent to reproduce the neuropathological, and behavioural feature of Parkinson's Disease (PD) in rat. Due to acute and chronic exposure of rotenone with various doses through different routes of administration, mortality is being reported. Low dose takes a longer duration to produce PD symptoms in animals. This present study was designed to create hemiparkinsonian 'partial' lesion model by rotenone at a single moderate dose in two sites of striatum in albino rats and also to assess its toxicity by behavioural parameters and by microscopic study...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28494751/integrated-analysis-of-droxidopa-trials-for-neurogenic-orthostatic-hypotension
#6
Italo Biaggioni, L Arthur Hewitt, Gerald J Rowse, Horacio Kaufmann
BACKGROUND: Droxidopa, a prodrug of norepinephrine, was approved for treatment of neurogenic orthostatic hypotension (nOH) due to primary autonomic disorders based on 3 randomized double-blind studies. We performed safety and efficacy analyses of this pooled dataset (n = 460). METHODS: Efficacy was assessed using Orthostatic Hypotension Questionnaire (OHQ) scores (composite and individual items). Safety and tolerability were also examined. RESULTS: Droxidopa improved virtually all nOH symptom scores compared with placebo, significantly reducing OHQ composite score (-2...
May 12, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28494345/weight-gain-after-stn-dbs-the-role-of-reward-sensitivity-and-impulsivity
#7
Marilena Aiello, Roberto Eleopra, Francesco Foroni, Sara Rinaldo, Raffaella I Rumiati
Weight gain has been reported after deep brain stimulation of the subthalamic nucleus (STN-DBS), a widely used treatment for Parkinson's disease (PD). This nucleus has been repeatedly found to be linked both to reward and to inhibitory control, two key aspects in the control of food intake. In this study, we assessed whether weight gain experienced by patients with PD after STN-DBS, might be due to an alteration of reward and inhibitory functions. Eighteen patients with PD were compared to eighteen healthy controls and tested three times: before surgery, in ON medication and after surgery, respectively five days after the implantation in ON medication/OFF stimulation and at least three months after surgery in ON medication/ON stimulation...
April 21, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28490648/randomized-trial-of-preladenant-given-as-monotherapy-in-patients-with-early-parkinson-disease
#8
Fabrizio Stocchi, Olivier Rascol, Robert A Hauser, Susan Huyck, Anjela Tzontcheva, Rachel Capece, Tony W Ho, Peter Sklar, Christopher Lines, David Michelson, David J Hewitt
OBJECTIVE: To evaluate the adenosine 2a receptor antagonist preladenant as a nondopaminergic drug for the treatment of Parkinson disease (PD) when given as monotherapy. METHODS: This was a randomized, 26-week, placebo- and active-controlled, parallel-group, multicenter, double-blind trial conducted in adults diagnosed with PD for <5 years who were not yet receiving l-dopa or dopamine agonists. Patients with a Unified Parkinson's Disease Rating Scale (UPDRS) part 3 (motor function) score ≥10 and Hoehn & Yahr score ≤3 were randomized 1:1:1:1:1 to preladenant 2, 5, or 10 mg twice daily, rasagiline 1 mg (active-control) once daily, or placebo...
May 10, 2017: Neurology
https://www.readbyqxmd.com/read/28490336/characteristics-of-l-citrulline-transport-through-blood-brain-barrier-in-the-brain-capillary-endothelial-cell-line-tr-bbb-cells
#9
Kyeong-Eun Lee, Young-Sook Kang
BACKGROUND: L-Citrulline is a neutral amino acid and a major precursor of L-arginine in the nitric oxide (NO) cycle. Recently it has been reported that L-citrulline prevents neuronal cell death and protects cerebrovascular injury, therefore, L-citrulline may have a neuroprotective effect to improve cerebrovascular dysfunction. Therefore, we aimed to clarify the brain transport mechanism of L-citrulline through blood-brain barrier (BBB) using the conditionally immortalized rat brain capillary endothelial cell line (TR-BBB cells), as an in vitro model of the BBB...
May 10, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/28480927/antiradical-activity-of-catecholamines-and-metabolites-of-dopamine-theoretical-and-experimental-study
#10
D Dimić, D Milenković, J Dimitrić Marković, Z Marković
The importance of molecules with antiradical potency that are produced in the human body has significantly increased. Among others, neurotransmitters and their metabolites act as the first line of defense against oxidative stress in the peripheral endocrine and the central nervous systems. Dopamine (DO), epinephrine (EP), norepinephrine (NE), l-DOPA, catechol, and three metabolites of dopamine (3-methoxytyramine (3-MT), homovanillic acid (HO), and 3,4-dihydrophenylacetic acid (DOPAC)) were investigated for their antiradical potency via computational methods and DPPH assay...
May 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28472883/mussel-inspired-thermoresponsive-polypeptide-pluronic-copolymers-for-versatile-surgical-adhesives-and-hemostasis
#11
Dedai Lu, Hongsen Wang, Ting'e Li, Yunfei Li, Fajuan Dou, Shaobo Sun, Hongyun Guo, Shiqi Liao, Zhiwang Yang, Qiangbing Wei, Ziqiang Lei
Inspired by marine mussel adhesive proteins, polymers with catechol side groups have been extensively explored in industrial and academic research. Here, Pluronic L-31 alcoholate ions were used as the initiator to prepare a series of polypeptide-Pluronic-polypeptide triblock copolymers via ring-opening polymerization of l-DOPA-N-carboxyanhydride (DOPA-NCA), l-arginine-NCA (Arg-NCA), l-cysteine-NCA (Cys-NCA), and ε-N-acryloyl lysine-NCA (Ac-Lys-NCA). These copolymers demonstrated good biodegradability, biocompatibility, and thermoresponsive properties...
May 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28469105/long-term-levodopa-treatment-accelerates-the-circadian-rhythm-dysfunction-in-a-6-hydroxydopamine-rat-model-of-parkinson-s-disease
#12
Si-Yue Li, Ya-Li Wang, Wen-Wen Liu, Dong-Jun Lyu, Fen Wang, Cheng-Jie Mao, Ya-Ping Yang, Li-Fang Hu, Chun-Feng Liu
BACKGROUND: Parkinson's disease (PD) patients with long-term levodopa (L-DOPA) treatment are suffering from severe circadian dysfunction. However, it is hard to distinguish that the circadian disturbance in patients is due to the disease progression itself, or is affected by L-DOPA replacement therapy. This study was to investigate the role of L-DOPA on the circadian dysfunction in a rat model of PD. METHODS: The rat model of PD was constructed by a bilateral striatal injection with 6-hydroxydopamine (6-OHDA), followed by administration of saline or 25 mg/kg L-DOPA for 21 consecutive days...
May 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28465179/phenoloxidase-activity-in-humoral-plasma-hemocyanin-and-hemocyanin-separated-proteins-of-the-giant-freshwater-prawn-macrobrachium-rosenbergii
#13
Sivakumar Mullaivanam Ramasamy, Maghil Denis, Shanthi Sivakumar, Arumugam Munusamy
Hemocyanin is a copper containing protein and its role in the immune function of phenoloxidase (PO) activity was investigated in the giant freshwater prawn Macrobrachium rosenbergii. Hemocyanin, sedimented by ultracentrifugation from the plasma appeared on polyacrylamide gel electrophoresis (PAGE 7%) on Coomassie Brilliant Blue and bathocuproine sulfonic acid stain as four copper containing proteins of molecular masses 50, 60, 114 and 325kDa. Accordingly, on diethylaminoethyl-cellulose anion exchange column hemocyanin separated into four proteins designated as MrHc1, MrHc2, MrHc3 and MrHc4 with electrophoretically (PAGE) determined molecular masses of 60, 114, 50 and 325kDa respectively...
April 29, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28460160/serotonergic-approaches-in-parkinson-s-disease-translational-perspectives-an-update
#14
Philippe Huot, Véronique Sgambato-Faure, Susan H Fox, Andrew C McCreary
Parkinson's disease (PD) has long been seen as a disorder caused by degeneration of the dopaminergic system, leading to the classic motor manifestations of the disease. However, there is now overwhelming evidence that PD is more than a disease merely caused by dopamine depletion. It is well-known that a myriad of other neurotransmitters are affected by the disease process. One such neurotransmitter is serotonin (5-HT). 5-HT has been shown to play a role in several motor and nonmotor manifestations of PD, including tremor, cognition, depression and psychosis...
May 5, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28459864/tyrosinase-inhibitory-activity-molecular-docking-studies-and-antioxidant-potential-of-chemotypes-of-lippia-origanoides-verbenaceae-essential-oils
#15
Alessandra P da Silva, Natália de F Silva, Eloísa Helena A Andrade, Tais Gratieri, William N Setzer, José Guilherme S Maia, Joyce Kelly R da Silva
The essential oils (EOs) of the aerial parts of Lippia origanoides (LiOr), collected in different localities of the Amazon region, were obtained by hydrodistillation and analyzed by GC and CG-MS. Principle component analysis (PCA) based on chemical composition grouped the oils in four chemotypes rich in mono- and sesquiterpenoids. Group I was characterized by 1,8-cineole and α-terpineol (LiOr-1 and LiOr-4) and group II by thymol (LiOr-2). The oil LiOr-3 showed β-caryophyllene, α-phellandrene and β-phellandrene as predominant and LiOr-5 was rich in (E)-nerolidol and β-caryophyllene...
2017: PloS One
https://www.readbyqxmd.com/read/28458418/central-dopaminergic-system-plays-a-role-in-the-analgesic-action-of-paracetamol-preclinical-evidence
#16
A Bhagyashree, Shyamjith Manikkoth, Melinda Sequeira, Roopa Nayak, S N Rao
OBJECTIVE: Even after 100 years of discovery, the exact mechanisms for the analgesic action of paracetamol are under scanner. It was recently proposed that paracetamol may act through different mechanisms, especially altering the serotoninergic system. The main objective of this preclinical study was to verify the role of drugs modulating dopaminergic system (l-dopa, bromocriptine, olanzapine) on the analgesic effect of paracetamol. MATERIALS AND METHODS: Thirty adult male albino mice were divided into five groups: distilled water (0...
January 2017: Indian Journal of Pharmacology
https://www.readbyqxmd.com/read/28456625/effects-of-matsutake-mushroom-scent-compounds-on-tyrosinase-and-murine-b16-f10-melanoma-cells
#17
Hiroki Satooka, Philip Cerda, Hae-Jung Kim, William F Wood, Isao Kubo
Tyrosinase-catalyzed l-tyrosine oxidation is a key step in melanogenesis, and intense melanin formation is often a problem in chemotherapies or food preservation. Here we report that methyl cinnamate one of the constituents characterized from mycelium and sporocarp of American matsutake mushroom Tricholoma magnivelare inhibits both enzymatic and cellular melanin formation. Methyl cinnamate inhibits mushroom tyrosinase-catalyzed l-tyrosine oxidation while the oxidation of l-3,4-dihydroxyphenylalanine (l-DOPA) was not inhibited...
June 10, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28456080/radiosynthesis-and-biological-evaluation-of-n-2-18-f-fluoropropionyl-3-4-dihydroxy-l-phenylalanine-as-a-pet-tracer-for-oncologic-imaging
#18
Caihua Tang, Dahong Nie, Ganghua Tang, Siyuan Gao, Shaoyu Liu, Fuhua Wen, Xiaolan Tang
INTRODUCTION: Several (11)C and (18)F labeled 3,4-dihydroxy-l-phenylalanine (l-DOPA) analogues have been used for neurologic and oncologic diseases, especially for brain tumors and neuroendocrine tumors PET imaging. However, (18)F-labeled N-substituted l-DOPA analogues have not been reported so far. In the current study, radiosynthesis and biological evaluation of a new (18)F-labeled l-DOPA analogue, N-(2-[(18)F]fluoropropionyl)-3,4-dihydroxy-l-phenylalanine ([(18)F]FPDOPA) for tumor PET imaging are performed...
April 7, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28449715/functional-implications-of-microbial-and-viral-gut-metagenome-changes-in-early-stage-l-dopa-na%C3%A3-ve-parkinson-s-disease-patients
#19
J R Bedarf, F Hildebrand, L P Coelho, S Sunagawa, M Bahram, F Goeser, P Bork, U Wüllner
BACKGROUND: Parkinson's disease (PD) presently is conceptualized as a protein aggregation disease in which pathology involves both the enteric and the central nervous system, possibly spreading from one to another via the vagus nerves. As gastrointestinal dysfunction often precedes or parallels motor symptoms, the enteric system with its vast diversity of microorganisms may be involved in PD pathogenesis. Alterations in the enteric microbial taxonomic level of L-DOPA-naïve PD patients might also serve as a biomarker...
April 28, 2017: Genome Medicine
https://www.readbyqxmd.com/read/28447507/akinetic-mutism-reversibility-after-l-dopa-therapy-in-unilateral-left-anterior-cerebral-artery-infarction
#20
Guery Deborah, Elodie Ong, Norbert Nighoghossian
No abstract text is available yet for this article.
April 27, 2017: Neurocase
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