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https://www.readbyqxmd.com/read/28927551/impaired-contextual-fear-conditioning-in-mam-rodent-model-of-schizophrenia
#1
Kathryn M Gill, Sarah A Miller, Anthony A Grace
The methylazoxymethanol acetate (MAM) rodent neurodevelopmental model of schizophrenia exhibits aberrant dopamine system activation attributed to hippocampal dysfunction. Context discrimination is a component of numerous behavioral and cognitive functions and relies on intact hippocampal processing. The present study explored context processing behaviors, along with dopamine system activation, during fear learning in the MAM model. Male offspring of dams treated with MAM (20mg/kg, i.p.) or saline on gestational day 17 were used for electrophysiological and behavioral experiments...
September 15, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28920541/recovery-of-brodifacoum-in-vomitus-following-induction-of-emesis-in-dogs-that-had-ingested-rodenticide-bait
#2
K H Parton, E K Willson, M G Collett, L H Booth
AIM: To assess the benefit of inducing emesis in dogs that have ingested rodenticide bait containing brodifacoum (BDF), by determining the amount of BDF in bait recovered from the vomitus relative to the estimated amount consumed. METHODS: Between 2014 and 2015 samples of vomitus from seven dogs that ingested rodenticide baits containing BDF were submitted by veterinarians in New Zealand. All seven dogs had been given apomorphine by the veterinarian and vomited within 1 hour of ingesting the bait...
September 17, 2017: New Zealand Veterinary Journal
https://www.readbyqxmd.com/read/28919466/intrastriatally-injected-botulinum-neurotoxin-a-differently-effects-cholinergic-and-dopaminergic-fibers-in-c57bl-6-mice
#3
Alexander Hawlitschka, Carsten Holzmann, Sarah Witt, Juliane Spiewok, Anne-Marie Neumann, Oliver Schmitt, Andreas Wree, Veronica Antipova
Unilateral intrastriatal BoNT-A injection abolished apomorphine-induced rotational behavior in a rat model of hemiparkinsonism (hemi-PD) up to 6 months. It was hypothesized that the beneficial effect of botulinum neurotoxin-A (BoNT-A) grounded on the reduction of the Parkinson's diseases (PD) associated striatal hypercholinism. Intrastriatal injection of BoNT-A was not cytotoxic in rat brain, but neuronal fiber swellings in the BoNT-A infiltrated striata appeared and named BoNT-A-induced varicosities (BiVs)...
September 14, 2017: Brain Research
https://www.readbyqxmd.com/read/28918840/neuroprotective-effects-of-eexenatide-in-a-rotenone-induced-rat-model-of-parkinson-s-disease
#4
Dürdane Aksoy, Volkan Solmaz, Türker Çavuşoğlu, Ayfer Meral, Utku Ateş, Oytun Erbaş
BACKROUND: Several studies suggest an association between Parkinson's disease (PD) and type 2 diabetes mellitus; these 2 diseases are both known to affect the common molecular pathways. As a synthetic agonist for the glucagon-like peptide 1 receptor, exenatide has been evaluated as a neuroprotective agent in multiple animal models. Rotenone models of PD have great potential for the investigation of PD pathology and motor and nonmotor symptoms, as well as the role of gene-environment interactions in PD causation and pathogenesis...
September 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28895769/the-cost-effectiveness-of-levodopa-carbidopa-intestinal-gel-compared-to-standard-care-in-advanced-parkinson-s-disease
#5
Julia Lowin, Kavita Sail, Rakhi Baj, Yash J Jalundhwala, Thomas S Marshall, Henrietta Konwea, K R Chaudhuri
BACKGROUND: Parkinson's disease (PD) is an incurable, progressive neurological condition, with symptoms impacting movement, walking and posture that eventually become severely disabling. Advanced PD (aPD) has a significant impact on quality of life (QoL) for patients, their caregivers/families. Levodopa/carbidopa intestinal gel (LCIG) is indicated for the treatment of advanced levodopa-responsive PD with severe motor fluctuations and hyper-/dyskinesia when available combinations of therapy have not given satisfactory results...
September 12, 2017: Journal of Medical Economics
https://www.readbyqxmd.com/read/28895186/the-placebo-effect-on-bradykinesia-in-parkinson-s-disease-with-and-without-prior-drug-conditioning
#6
Elisa Frisaldi, Elisa Carlino, Maurizio Zibetti, Diletta Barbiani, Francesca Dematteis, Michele Lanotte, Leonardo Lopiano, Fabrizio Benedetti
BACKGROUND: Placebo effects represent a major drawback in clinical trials, and their magnitude hampers the development of new treatments. Previous research showed that prior exposure to active treatments increases the placebo response for muscle rigidity in Parkinson's disease. METHODS: We investigated the effects of prior exposure to apomorphine on the placebo response of another cardinal symptom of Parkinson's disease, bradykinesia, by a movement time analyzer...
September 12, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28893517/differential-effects-of-levodopa-and-apomorphine-on-neuronal-population-oscillations-in-the-cortico-basal-ganglia-loop-circuit-in-vivo-in-experimental-parkinsonism
#7
Johanna Kühn, Jens K Haumesser, Maximilian H Beck, Jennifer Altschüler, Andrea A Kühn, Vadim N Nikulin, Christoph van Riesen
The current pharmacotherapy of Parkinson's disease (PD) is primarily based on two classes of drugs: dopamine precursors, namely levodopa, and dopamine receptor agonists, such as apomorphine. Although both types of agents exert their beneficial clinical effects on motor and non-motor symptoms in PD via dopamine receptors, clinical efficiency and side effects differ substantially between levodopa and apomorphine. Levodopa can provide a greater symptomatic relief than dopamine receptor agonists. However, because long-term levodopa use is associated with early debilitating motor fluctuations, dopamine receptor agonists are often recommended in younger patients...
September 8, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28883808/grass-carp-follisatin-molecular-cloning-functional-characterization-dopamine-d1-regulation-at-pituitary-level-and-implication-in-growth-hormone-regulation
#8
Roger S K Fung, Bai Jin, Mulan He, Karen W Y Yuen, Anderson O L Wong
Activin is involved in pituitary hormone regulation and its pituitary actions can be nullified by local production of its binding protein follistatin. In our recent study with grass carp, local release of growth hormone (GH) was shown to induce activin expression at pituitary level, which in turn could exert an intrapituitary feedback to inhibit GH synthesis and secretion. To further examine the activin/follistatin system in the carp pituitary, grass carp follistatin was cloned and confirmed to be single-copy gene widely expressed at tissue level...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28881616/repetitive-transcranial-magnetic-stimulation-for-treatment-of-lactacystin-induced-parkinsonian-rat-model
#9
Maowen Ba, Guozhao Ma, Chao Ren, Xuwen Sun, Min Kong
The dysfunction of ubiquitin-proteasome system is an important pathogenesis in the neurodegenerative process of Parkinson's disease. Repetitive transcranial magnetic stimulation (rTMS) is a noninvasive and potential method in treating Parkinson's disease. To investigate whether rTMS has neuroprotective effects in parkinsonian rat model induced by ubiquitin-proteasome system impairment, we gave rTMS daily for 4 weeks to proteasome inhibitor, lactacystin-induced parkinsonian rat model. Rotational behavior test demonstrated that rTMS obviously reduced apomorphine-induced turning number in parkinsonian rats...
August 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28872217/adverse-effects-produced-by-different-drugs-used-in-the-treatment-of-parkinson-s-disease-a-mixed-treatment-comparison
#10
Bao-Dong Li, Zhen-Yun Bi, Jing-Feng Liu, Wei-Jun Si, Qian-Qian Shi, Li-Peng Xue, Jing Bai
OBJECTIVE: This mixed treatment comparison is used to compare the adverse effects of eleven different drugs used to treat Parkinson's disease (PD). The drugs that we compare include the following: ropinirole, rasagiline, rotigotine, entacapone, apomorphine, pramipexole, sumanirole, bromocriptine, piribedil, pergolide, and levodopa. METHODS: PubMed, EMBASE, and Cochrane Library were searched from the inception to December 2015. Our analysis combines the evidences of direct comparison and indirect comparison between various literatures...
September 4, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28864281/interaction-of-brain-derived-neurotrophic-factor-val66met-genotype-and-history-of-stress-in-regulation-of-prepulse-inhibition-in-mice
#11
Maarten van den Buuse, John Juan Wen Lee, Emily J Jaehne
The Brain-Derived Neurotrophic Factor (BDNF) Val66Met polymorphism results in reduced activity-dependent BDNF release and has been implicated in schizophrenia. However, effects of the polymorphism on functional dopaminergic and N-methyl-d-aspartate (NMDA) receptor-associated activity remain unclear. We used prepulse inhibition, a measure of sensorimotor gating which is disrupted in schizophrenia, and assessed the effects of acute treatment with the dopamine receptor agonist, apomorphine (APO), and the NMDA receptor antagonist, MK-801...
August 29, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28861668/neuroprotective-activities-of-spirulina-platensis-in-the-6-ohda-model-of-parkinson-s-disease-are-related-to-its-anti-inflammatory-effects
#12
Francisco Arnaldo Viana Lima, Ivan Pinheiro Joventino, Francisca Pinheiro Joventino, Aline Cordeiro de Almeida, Kelly Rose Tavares Neves, Marta Regina do Carmo, Luzia Kalyne Almeida Moreira Leal, Geanne Matos de Andrade, Glauce Socorro de Barros Viana
Spirulina platensis (SPI) is a cyanobacterium, presenting anti-inflammatory and antioxidant actions. Considering the importance of inflammation and oxidative stress in Parkinson's disease (PD), SPI neuroprotective effects were evaluated in a model of PD. Male Wistar rats were divided into: sham-operated (SO), untreated 6-OHDA and 6-OHDA treated with SPI (25 and 50 mg/kg, p.o.). The 6-OHDA was injected into the right striata and SPI treatments started 24 h later for 2 weeks. The SO and untreated 6-OHDA-lesioned groups were administered with distilled water, for the same period...
August 31, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28859998/long-term-behavioral-sensitization-to-apomorphine-is-independent-of-conditioning-and-increases-conditioned-pecking-but-not-preference-in-pigeons
#13
Patrick Anselme, Neslihan Edeş, Sepideh Tabrik, Onur Güntürkün
When rodents are given a free choice between a variable option and a constant option, they may prefer variability. This preference is even sometimes increased following repeated administration of a dopamine agonist. The present study was the first to examine preference for variability under the systemic administration of a dopamine agonist, apomorphine (Apo), in birds. Experiment 1 tested the drug-free preference and the propensity to choose of pigeons for a constant over a variable delay. It appeared that they preferred and decided more quickly to peck at the optimal delay option...
August 30, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28858300/development-of-a-high-throughput-fluorescence-polarization-assay-for-the-discovery-of-ezh2-eed-interaction-inhibitors
#14
Mao-Rong Zhu, Dao-Hai Du, Jun-Chi Hu, Lian-Chun Li, Jing-Qiu Liu, Hong Ding, Xiang-Qian Kong, Hua-Liang Jiang, Kai-Xian Chen, Cheng Luo
Aberrant activity of enhancer of zeste homolog 2 (EZH2) is associated with a wide range of human cancers. The interaction of EZH2 with embryonic ectoderm development (EED) is required for EZH2's catalytic activity. Inhibition of the EZH2-EED complex thus represents a novel strategy for interfering with the oncogenic potentials of EZH2 by targeting both its catalytic and non-catalytic functions. To date, there have been no reported high-throughput screening (HTS) assays for inhibitors acting at the EZH2-EED interface...
August 31, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/28843679/phase-coherence-classification-a-new-wavelet-based-method-to-separate-local-field-potentials-into-local-in-coherent-and-volume-conducted-components
#15
M von Papen, H Dafsari, E Florin, F Gerick, L Timmermann, J Saur
BACKGROUND: Local field potentials (LFP) reflect the integrated electrophysiological activity of large neuron populations and may thus reflect the dynamics of spatially and functionally different networks. NEW METHOD: We introduce the wavelet-based phase-coherence classification (PCC), which separates LFP into volume-conducted, local incoherent and local coherent components. It allows to compute power spectral densities for each component associated with local or remote electrophysiological activity...
August 31, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28837077/electroacupuncture-promotes-recovery-of-motor-function-and-reduces-dopaminergic-neuron-degeneration-in-rodent-models-of-parkinson-s-disease
#16
Jaung-Geng Lin, Chao-Jung Chen, Han-Bin Yang, Yi-Hung Chen, Shih-Ya Hung
Parkinson's disease (PD) is a common neurodegenerative disease. The pathological hallmark of PD is a progressive loss of dopaminergic neurons in the substantia nigra (SN) pars compacta in the brain, ultimately resulting in severe striatal dopamine deficiency and the development of primary motor symptoms (e.g., resting tremor, bradykinesia) in PD. Acupuncture has long been used in traditional Chinese medicine to treat PD for the control of tremor and pain. Accumulating evidence has shown that using electroacupuncture (EA) as a complementary therapy ameliorates motor symptoms of PD...
August 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28817841/-practical-use-of-continuous-apomorphine-infusion-via-pump
#17
Lars Tönges, Andrés Ceballos-Baumann, Holger Honig, Alexander Storch, Wolfgang H Jost
Parkinson's disease is the second most common neurodegenerative illness after Alzheimer's disease. In its advanced stages, it is characterized by various special symptoms. In addition to non-motor signs, motor complications are most prominent and most often can only be inadequately improved with pulsatile oral therapies. However, with the aid of continuous dopaminergic stimulation, improvements can be achieved even in advanced stages of the disease. This will not only alleviate motor and non-motor symptoms, but will also lead to a better quality of life...
September 2017: Fortschritte der Neurologie-Psychiatrie
https://www.readbyqxmd.com/read/28805563/infusional-therapies-continuous-dopaminergic-stimulation-and-nonmotor-symptoms
#18
Ulrika Mundt-Petersen, Per Odin
Pump-based Parkinson (PD) therapies, including subcutaneous apomorphine infusion (CSA) and levodopa-carbidopa intestinal gel (LCIG), presently constitute the most effective pharmacological treatments available for advanced PD. These therapies are based on a more constant delivery of the dopaminergic drug resulting in a more continuous dopaminergic stimulation and a more stable treatment effect. This can be detected as reduction of time in off, reduction of dyskinesia frequency and severity, as well as increase of time in on without troublesome dyskinesias...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28764908/neuroprotective-effects-of-lentivirus-mediated-cystathionine-beta-synthase-overexpression-against-6-ohda-induced-parkinson-s-disease-rats
#19
Yin Weilan, Yin Weiguo, Huang Baisheng, Wu Lixiang
Parkinson's disease (PD) is age-related neurodegenerative disorder by a progressive loss of dopaminergic(DA) neurons in the substantia nigra (SN) and striatum, which is at least partly associated with α-synuclein protein accumulation in these neurons. Hydrogen sulfide (H2S) plays an important role in the nervous system. Studies have shown that H2S has a protective effect on PD. However, as a kind of gas molecules, H2S is lively, volatile, and not conducive to scientific research and clinical application. Cystathionine-beta-synthase(CBS) is the main enzymes of synthesis of H2S in the brain...
July 29, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28758044/deep-brain-stimulation-of-hemiparkinsonian-rats-with-unipolar-and-bipolar-electrodes-for-up-to-6-weeks-behavioral-testing-of-freely-moving-animals
#20
Kathrin Badstuebner, Ulrike Gimsa, Immo Weber, Armin Tuchscherer, Jan Gimsa
Although the clinical use of deep brain stimulation (DBS) is increasing, its basic mechanisms of action are still poorly understood. Platinum/iridium electrodes were inserted into the subthalamic nucleus of rats with unilateral 6-OHDA-induced lesions of the medial forebrain bundle. Six behavioral parameters were compared with respect to their potential to detect DBS effects. Locomotor function was quantified by (i) apomorphine-induced rotation, (ii) initiation time, (iii) the number of adjusting steps in the stepping test, and (iv) the total migration distance in the open field test...
2017: Parkinson's Disease
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