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https://www.readbyqxmd.com/read/28934196/spatiotemporal-network-coding-of-physiological-mossy-fiber-inputs-by-the-cerebellar-granular-layer
#1
Shyam Kumar Sudhakar, Sungho Hong, Ivan Raikov, Rodrigo Publio, Claus Lang, Thomas Close, Daqing Guo, Mario Negrello, Erik De Schutter
The granular layer, which mainly consists of granule and Golgi cells, is the first stage of the cerebellar cortex and processes spatiotemporal information transmitted by mossy fiber inputs with a wide variety of firing patterns. To study its dynamics at multiple time scales in response to inputs approximating real spatiotemporal patterns, we constructed a large-scale 3D network model of the granular layer. Patterned mossy fiber activity induces rhythmic Golgi cell activity that is synchronized by shared parallel fiber input and by gap junctions...
September 21, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28933164/correction-to-synthesis-and-n-methyl-d-aspartate-nmda-receptor-activity-of-ketamine-metabolites
#2
Patrick J Morris, Ruin Moaddel, Panos Zanos, Curtis E Moore, Todd D Gould, Carlos A Zarate, Craig J Thomas
No abstract text is available yet for this article.
September 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28932896/-update-on-anti-n-methyl-d-aspartate-receptor-encephalitis
#3
S Kovac, J Alferink, D Ahmetspahic, V Arolt, N Melzer
Autoimmune encephalitis is a group of autoimmune inflammatory disorders affecting both grey and white matter of the central nervous system. Encephalitis with autoantibodies against the N‑methyl-D-aspartate receptor (NMDA-R) is the most frequent autoimmune encephalitis syndrome presenting with a characteristic sequence of psychiatric and neurological symptoms. Treatment necessitates a close interdisciplinary cooperation. This article provides an update on the current knowledge on diagnostic standards, pathogenesis, and treatment strategies for anti-NMDA-R encephalitis from psychiatric and neurological perspectives...
September 20, 2017: Der Nervenarzt
https://www.readbyqxmd.com/read/28931647/randomized-open-label-trial-of-dextromethorphan-in-rett-syndrome
#4
Constance L Smith-Hicks, Siddharth Gupta, Joshua B Ewen, Manisha Hong, Lisa Kratz, Richard Kelley, Elaine Tierney, Rebecca Vaurio, Genila Bibat, Abanti Sanyal, Gayane Yenokyan, Nga Brereton, Michael V Johnston, Sakkubai Naidu
OBJECTIVE: To determine safety and perform a preliminary assessment of dose-dependent efficacy of dextromethorphan in normalizing electrographic spikes, clinical seizures, and behavioral and cognitive functions in girls with Rett syndrome. METHODS: We used a prospective randomized, open-label trial in fast metabolizers of dextromethorphan to examine the effect of dextromethorphan on core clinical features of Rett syndrome. Interictal spike activity and clinical seizures were determined using EEG and parent reporting...
September 20, 2017: Neurology
https://www.readbyqxmd.com/read/28931097/-approaching-new-pharmacotherapy-options-in-pain-treatment
#5
András Telekes
The evolution of medicine is noticeable in most therapeutic areas, the worse the current therapeutic result, the more quick the improvement. This is especially true in such areas that require substantial social resources, namely oncology, diabetology and CNS diseases. Pain is not a disease, it is a symptom. Pain is one of the most important components of human suffering thus it deserves special attention. In recent years new formulations of old medicines were introduced rather than new medicines. Maybe ziconitide is the last pain killer with new mechanism of action which was approved by FDA in 2004...
September 20, 2017: Magyar Onkologia
https://www.readbyqxmd.com/read/28930529/a-protocol-for-investigating-the-association-of-vaccination-and-anti-nmda-receptor-encephalitis
#6
Hsiuying Wang
Anti-N-methyl-D-aspartate (Anti-NMDA) receptor encephalitis is an acute autoimmune neurological disorder that can be triggered by virus, H1N1/tetanus/diphtheria/pertussis and polio vaccines or by presence of a tumor. The association between anti-NMDA receptor encephalitis and Japanese encephalitis vaccination was examined and a general protocol of phylogenetic method which details the steps and code and an example of its utility is provided. The approach used here is potentially useful for analyzing the relationship between vaccines and diseases...
January 1, 2018: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/28929331/glutamatergic-regulation-of-hypothalamic-presympathetic-neurons-in-hypertension
#7
De-Pei Li, Hui-Lin Pan
Elevated sympathetic vasomotor tone emanating from the brain is a major mechanism involved in the development of hypertension. Increased glutamatergic excitatory input to presympathetic neurons in the paraventricular nucleus (PVN) of the hypothalamus leads to increased sympathetic outflow in various animal models of hypertension. Recent studies have revealed molecular and cellular mechanisms underlying enhanced glutamatergic synaptic input to PVN presympathetic neurons in hypertension. In this review article, we summarize recent findings on changes in inotropic and metabotropic glutamate receptors, at both presynaptic and postsynaptic sites, responsible for increased glutamatergic input to PVN presympathetic neurons in hypertension...
September 19, 2017: Current Hypertension Reports
https://www.readbyqxmd.com/read/28928637/alpha7-nicotinic-acetylcholine-receptors-play-a-predominant-role-in-the-cholinergic-potentiation-of-n-methyl-d-aspartate-evoked-firing-responses-of-hippocampal-ca1-pyramidal-cells
#8
Zsolt K Bali, Lili V Nagy, István Hernádi
The aim of the present study was to identify in vivo electrophysiological correlates of the interaction between cholinergic and glutamatergic neurotransmission underlying memory. Extracellular spike recordings were performed in the hippocampal CA1 region of anesthetized rats in combination with local microiontophoretic administration of N-methyl-D-aspartate (NMDA) and acetylcholine (ACh). Both NMDA and ACh increased the firing rate of the neurons. Furthermore, the simultaneous delivery of NMDA and ACh resulted in a more pronounced excitatory effect that was superadditive over the sum of the two mono-treatment effects and that was explained by cholinergic potentiation of glutamatergic neurotransmission...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28925523/bdnf-haplo-insufficiency-impairs-high-frequency-cortical-oscillations-in-mice
#9
Nigel C Jones, Matthew Hudson, Joshua Foreman, Gil Rind, Rachel Hill, Elizabeth E Manning, Maarten van den Buuse
Schizophrenia is a complex psychiatric disorder with a heterogeneous aetiology involving genetic and environmental factors. Deficiencies in both brain-derived neurotrophic factor (BDNF) and NMDA receptor function have been implicated in the disorder, and may play causal and synergistic roles. Perturbations in the regulation of electrophysiological signals, including high-frequency (gamma: 30-80 Hz and beta: 20-30 Hz) neuronal oscillations, are also associated with the disorder. This study investigated the influence of BDNF deficiency and NMDA receptor hypofunction on electrophysiological responses to brief acoustic stimuli...
September 19, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28924012/inhibition-of-il-1%C3%AE-signaling-normalizes-nmda-dependent-neurotransmission-and-reduces-seizure-susceptibility-in-a-mouse-model-of-creutzfeldt-jakob-disease
#10
Ilaria Bertani, Valentina Iori, Massimo Trusel, Mattia Maroso, Claudia Foray, Susanna Mantovani, Raffaella Tonini, Annamaria Vezzani, Roberto Chiesa
Creutzfeldt-Jakob disease (CJD) is a neurodegenerative disorder caused by prion protein (PrP) misfolding, clinically recognized by cognitive and motor deficits, electroencephalographic (EEG) abnormalities and seizures. Its neurophysiological bases are not known. To assess the potential involvement of N-methyl-D-aspartate receptor (NMDAR) dysfunction, we analyzed NMDA-dependent synaptic plasticity in hippocampal slices from Tg(CJD) mice, which model a genetic form of CJD. Because PrP depletion may result in functional upregulation of NMDARs, we also analyzed PrP knockout (KO) mice...
September 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28922504/selective-remodeling-of-glutamatergic-transmission-to-striatal-cholinergic-interneurons-after-dopamine-depletion
#11
Jose de Jesus Aceves Buendia, Lior Tiroshi, Wei-Hua Chiu, Joshua A Goldberg
The widely-held view that the pathophysiology of Parkinson's disease arises from an under-activation of the direct pathway striatal spiny neurons (dSPNs) has gained support from a recently described weakening of the glutamatergic projection from the parafascicular nucleus (PfN) to dSPNs in experimental parkinsonism. However, the impact of the remodeling of the thalamostriatal projection cannot be fully appreciated without considering its impact on cholinergic interneurons (ChIs) that themselves preferentially activate indirect pathway spiny neurons (iSPNs)...
September 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28922156/soluble-oligomers-require-a-ganglioside-to-trigger-neuronal-calcium-overload
#12
Roberta Cascella, Elisa Evangelisti, Alessandra Bigi, Matteo Becatti, Claudia Fiorillo, Massimo Stefani, Fabrizio Chiti, Cristina Cecchi
An altered distribution of membrane gangliosides (GM), including GM1, has recently been reported in the brains of Alzheimer's disease (AD) patients. Moreover, amyloid-positive synaptosomes obtained from AD brains were found to contain high-density GM1 clusters, suggesting a pathological significance of GM1 increase at presynaptic neuritic terminals in AD. Here, we show that membrane GM1 specifically recruits small soluble oligomers of the 42-residue form of amyloid-β peptide (Aβ42), with intracellular flux of Ca2+ ions in primary rat hippocampal neurons and in human neuroblastoma cells...
September 8, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28921679/maternal-immune-activation-leads-to-increased-nnos-immunoreactivity-in-the-brain-of-postnatal-day-2-rat-offspring
#13
Jiaxian Zhang, Yu Jing, Hu Zhang, David K Bilkey, Ping Liu
Neuronal nitric oxide synthase (nNOS) is a key arginine metabolising enzyme in the brain, and nNOS-derived nitric oxide plays an important role in regulating glutamatergic neurotransmission. Nitric oxide and its related molecules are involved in the pathogenesis of schizophrenia, and human genetic studies have identified schizophrenia risk genes encoding nNOS. The present study systematically investigated how maternal immune activation (MIA; a risk factor for schizophrenia) induced by polyinosinic:polycytidylic acid affected nNOS-immunoreactivity in the brain of the resulting male and female offspring at the age of postnatal day (PND) 2...
September 16, 2017: Synapse
https://www.readbyqxmd.com/read/28919538/roles-of-n-methyl-d-aspartate-receptors-during-the-sensory-stimulation-evoked-field-potential-responses-in-mouse-cerebellar-cortical-molecular-layer
#14
Yin-Hua Xu, Guang-Jian Zhang, Jing-Tong Zhao, Chun-Ping Chu, Yu-Zi Li, De-Lai Qiu
The functions of N-methyl-d-aspartate receptors (NMDARs) in cerebellar cortex have been widely studied under in vitro condition, but their roles during the sensory stimulation-evoked responses in the cerebellar cortical molecular layer in living animals are currently unclear. We here investigated the roles of NMDARs during the air-puff stimulation on ipsilateral whisker pad-evoked field potential responses in cerebellar cortical molecular layer in urethane-anesthetized mice by electrophysiological recording and pharmacological methods...
September 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28919534/glutamate-induced-rapid-induction-of-arc-arg3-1-requires-nmda-receptor-mediated-phosphorylation-of-erk-and-creb
#15
Tao Chen, Jie Zhu, Li-Kun Yang, Yi Feng, Wei Lin, Yu-Hai Wang
Arc/Arg3.1 is a unique immediate early gene whose expression is highly dynamic and correlated with various forms of synaptic plasticity. Many previous reports highlight the complexity of mechanisms that regulate Arc/Arg3.1 expression in neurons. In the present study, the expression and regulation of Arc/Arg3.1 after glutamate treatment in primary cultured cortical neurons were investigated. We found that both Arc/Arg3.1 mRNA and Arc/Arg3.1 protein dynamically increased within 24h after glutamate treatment. The results of immunostaining showed that abundant amounts of Arc/Arg3...
September 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28918254/permissive-role-for-mglu1-metabotropic-glutamate-receptors-in-excitotoxic-retinal-degeneration
#16
Francesca Liberatore, Domenico Bucci, Giada Mascio, Michele Madonna, Paola Di Pietro, Martina Beneventano, Alda Maria Puliti, Giuseppe Battaglia, Valeria Bruno, Ferdinando Nicoletti, Maria Rosaria Romano
Neuroprotection is an unmet need in eye disorders characterized by retinal ganglion cell (RGC) death, such as prematurity-induced retinal degeneration, glaucoma, and age- related macular degeneration. In all these disorders excitotoxicity is a prominent component of neuronal damage, but clinical data discourage the development of NMDA receptor antagonists as neuroprotectants. Here, we show that activation of mGlu1 metabotropic glutamate receptors largely contributes to excitotoxic degeneration of RGCs. Mice at postnatal day 9 were challenged with a toxic dose of monosodium glutamate (MSG, 3 g/kg), which caused the death of >70% of Brn-3a(+) RGCs...
September 13, 2017: Neuroscience
https://www.readbyqxmd.com/read/28917975/the-memory-ameliorating-effects-of-dhp1402-an-herbal-mixture-on-cholinergic-blockade-induced-cognitive-dysfunction-in-mice
#17
Haneul Kim, Hyung Eun Lee, In Ho Jung, Se Jin Jeon, Jiabao Zhang, Yubeen Kwon, Dae Sik Jang, Jong Hoon Ryu
ETHNOPHARMACOLOGICAL RELEVANCE: Ziziphus jujuba var. spinosa (Bunge) Hu ex H.F Chow (rhamnaceae) and Codonopsis lanceolata (Siedbold & Zucc.) Benth. & Hook.f. ex Trautv. (campanulaceae), compositions of DHP1402, have long been used for treating anti-dementia or hypomnesia as folk medicine. AIM OF THE STUDY: It has been reported that Z. jujuba var. spinosa and C. lanceolata are effective on cognitive function with different mechanism of action. Therefore, in the present study, we evaluated the synergistic effects of Ziziphus jujuba var...
September 13, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28917837/memantine-inhibits-%C3%AE-amyloid-aggregation-and-disassembles-preformed-%C3%AE-amyloid-aggregates
#18
Kaori Ito, Mitsuhiro Makino, Keiko Okado, Taisuke Tomita
Memantine, an uncompetitive glutamatergic N-methyl-d-aspartate (NMDA) receptor antagonist, is widely used as a medication for the treatment of Alzheimer's disease (AD). We previously reported that chronic treatment of AD with memantine reduces the amount of insoluble β-amyloid (Aβ) and soluble Aβ oligomers in animal models of AD. The mechanisms by which memantine reduces Aβ levels in the brain were evaluated by determining the effect of memantine on Aβ aggregation using thioflavin T and transmission electron microscopy...
September 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28916627/interactions-between-medial-prefrontal-cortex-and-dorsomedial-striatum-are-necessary-for-odor-span-capacity-in-rats-role-of-glun2b-containing-nmda-receptors
#19
Don A Davies, Quentin Greba, Jantz C Selk, Jillian K Catton, Landon D Baillie, Sean J Mulligan, John G Howland
Working memory is involved in the maintenance and manipulation of information essential for complex cognition. While the neural substrates underlying working memory capacity have been studied in humans, considerably less is known about the circuitry mediating working memory capacity in rodents. Therefore, the present experiments tested the involvement of medial prefrontal cortex (mPFC) and dorsal striatum (STR) in the odor span task (OST), a task proposed to assay working memory capacity in rodents. Initially, Long Evans rats were trained to dig in scented sand for food following a serial delayed nonmatching-to-sample rule...
October 2017: Learning & Memory
https://www.readbyqxmd.com/read/28916251/mk-801-but-not-naloxone-attenuates-high-dose-dextromethorphan-induced-convulsive-behavior-possible-involvement-of-the-glun2b-receptor
#20
Hai-Quyen Tran, Yoon Hee Chung, Eun-Joo Shin, The-Vinh Tran, Ji Hoon Jeong, Choon-Gon Jang, Seung-Yeol Nah, Kiyofumi Yamada, Toshitaka Nabeshima, Hyoung-Chun Kim
Dextromethorphan (DM) is a dextrorotatory isomer of levorphanol, a typical morphine-like opioid. When administered at supra-antitussive doses, DM produces psychotoxic and neurotoxic effects in humans. Although DM abuse has been well-documented, few studies have examined the effects of high-dose DM. The present study aimed to explore the effects of a single high dose of DM on mortality and seizure occurrence. After intraperitoneal administration with a high dose of DM (80mg/kg), Sprague-Dawley rats showed increased seizure occurrence and intensity...
September 13, 2017: Toxicology and Applied Pharmacology
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