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Excitatory glutamate receptors

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https://www.readbyqxmd.com/read/28337539/homer1-vesl-1-in-the-rat-esophagus-focus-on-myenteric-plexus-and-neuromuscular-junction
#1
J Zimmermann, W L Neuhuber, M Raab
Homer1, a scaffolding protein of the postsynaptic density (PSD), enriched at excitatory synapses is known to anchor and modulate group I metabotropic glutamate receptors (mGluRs) and different channel- and receptor-proteins. Homer proteins are expressed in neurons of different brain regions, but also in non-neuronal tissues like skeletal muscle. Occurrence and location of Homer1 and mGluR5 in myenteric plexus and neuromuscular junctions (NMJ) of rat esophagus have yet not been characterized. We located Homer1 and mGluR5 immunoreactivity (-iry) in rat esophagus and focused on myenteric neurons, intraganglionic laminar endings (IGLEs) and NMJs, using double- and triple-label immunohistochemistry and confocal laser scanning microscopy...
March 23, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28322866/decreased-anxiety-voluntary-ethanol-intake-and-ethanol-induced-cpp-acquisition-following-activation-of-the-metabotropic-glutamate-receptor-8-mglur8
#2
Amine Bahi
Metabotropic glutamate receptors (mGluRs) are important modulators of excitatory neurotransmission, and have been implicated in addiction to alcohol and anxiety-related behaviors. However, the behavioral consequence and contribution of individual subtypes are not known yet. This study determined the effects of mGluR8 activation on anxiety-like behavior, voluntary ethanol intake and ethanol-induced conditioned reward. To this aim, anxiety and spontaneous behavior were measured in C57BL/6J mice using the elevated plus maze (EPM), open field (OF) and light-dark box (LDB) tests after systemic injection of the selective mGluR8 agonist (S)-3,4-dicarboxyphenylglycine ((S)-3,4-DCPG)...
March 17, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28320266/mechanisms-of-long-term-plasticity-of-hippocampal-gabaergic-synapses
#3
REVIEW
A V Rozov, F F Valiullina, A P Bolshakov
Long-term potentiation and depression of synaptic transmission have been considered as cellular mechanisms of memory in studies conducted in recent decades. These studies were predominantly focused on mechanisms underlying plasticity at excitatory synapses. Nevertheless, normal central nervous system functioning requires maintenance of a balance between inhibition and excitation, suggesting existence of similar modulation of glutamatergic and GABAergic synapses. Here we review the involvement of G-protein-coupled receptors in the generation of long-term changes in synaptic transmission of inhibitory synapses...
March 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/28303090/the-inhibitory-effect-of-%C3%AE-%C3%AE-hydrolase-domain-containing-6-abhd6-on-the-surface-targeting-of-glua2-and-glua3-containing-ampa-receptors
#4
Mengping Wei, Moye Jia, Jian Zhang, Lulu Yu, Yunzhi Zhao, Yingqi Chen, Yimeng Ma, Wei Zhang, Yun S Shi, Chen Zhang
The α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-type glutamate receptors (AMPARs) are major excitatory receptors that mediate fast neurotransmission in the mammalian brain. The surface expression of functional AMPARs is crucial for synaptic transmission and plasticity. AMPAR auxiliary subunits control the biosynthesis, membrane trafficking, and synaptic targeting of AMPARs. Our previous report showed that α/β-hydrolase domain-containing 6 (ABHD6), an auxiliary subunit for AMPARs, suppresses the membrane delivery and function of GluA1-containing receptors in both heterologous cells and neurons...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28298303/ampa-receptor-mediated-rapid-epscs-in-vestibular-calyx-afferents
#5
Matthew Edward Kirk, Frances L Meredith, Tim A Benke, Katherine J Rennie
In the vestibular periphery neurotransmission between hair cells and primary afferent nerves occurs via specialized ribbon synapses. Type I vestibular hair cells (HCI) make synaptic contacts with calyx terminals, which enclose most of the HCI basolateral surface. To probe synaptic transmission, whole cell patch clamp recordings were made from calyx afferent terminals isolated together with their mature HCI from gerbil crista. Neurotransmitter release was measured as excitatory postsynaptic currents (EPSCs) in voltage clamp...
March 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28292832/functional-organization-of-vestibulo-ocular-responses-in-abducens-motoneurons
#6
Haike Dietrich, Stefan Glasauer, Hans Straka
Vestibulo-ocular reflexes (VOR) are the dominating contributors to gaze stabilization in all vertebrates. During horizontal head movements, abducens motoneurons form the final element of the reflex arc that integrates visuo-vestibular inputs into temporally precise motor commands for the lateral rectus eye muscle. Here, we studied a possible differentiation of abducens motoneurons into subtypes by evaluating their morphology, discharge properties and synaptic pharmacology in semi-intact in vitro preparations of larval Xenopus laevis Extracellular nerve recordings during sinusoidal head motion revealed a continuum of resting rates and activation thresholds during vestibular stimulation...
March 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28290985/synaptic-transmission-and-plasticity-require-ampa-receptor-anchoring-via-its-n-terminal-domain
#7
Jake F Watson, Hinze Ho, Ingo H Greger
AMPA-type glutamate receptors (AMPARs) mediate fast excitatory neurotransmission and are selectively recruited during activity-dependent plasticity to increase synaptic strength. A prerequisite for faithful signal transmission is the positioning and clustering of AMPARs at postsynaptic sites. The mechanisms underlying this positioning have largely been ascribed to the receptor cytoplasmic C-termini and to AMPAR-associated auxiliary subunits, both interacting with the postsynaptic scaffold. Here, using mouse organotypic hippocampal slices, we show that the extracellular AMPAR N-terminal domain (NTD), which projects midway into the synaptic cleft, plays a fundamental role in this process...
March 14, 2017: ELife
https://www.readbyqxmd.com/read/28285821/grasp1-regulates-synaptic-plasticity-and-learning-through-endosomal-recycling-of-ampa-receptors
#8
Shu-Ling Chiu, Graham Hugh Diering, Bing Ye, Kogo Takamiya, Chih-Ming Chen, Yuwu Jiang, Tejasvi Niranjan, Charles E Schwartz, Tao Wang, Richard L Huganir
Learning depends on experience-dependent modification of synaptic efficacy and neuronal connectivity in the brain. We provide direct evidence for physiological roles of the recycling endosome protein GRASP1 in glutamatergic synapse function and animal behavior. Mice lacking GRASP1 showed abnormal excitatory synapse number, synaptic plasticity, and hippocampal-dependent learning and memory due to a failure in learning-induced synaptic AMPAR incorporation. We identified two GRASP1 point mutations from intellectual disability (ID) patients that showed convergent disruptive effects on AMPAR recycling and glutamate uncaging-induced structural and functional plasticity...
March 22, 2017: Neuron
https://www.readbyqxmd.com/read/28284836/exciting-and-not-so-exciting-roles-of-pannexins
#9
REVIEW
Eliana Scemes, Jana Velíšková
It is the current view that purinergic signaling regulates many physiological functions. Pannexin1 (Panx1), a member of the gap junction family of proteins is an ATP releasing channel that plays important physio-pathological roles in various tissues, including the CNS. Upon binding to purinergic receptors expressed in neural cells, ATP triggers cellular responses including increased cell proliferation, cell morphology changes, release of cytokines, and regulation of neuronal excitability via release of glutamate, GABA and ATP itself...
March 8, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28284346/ampa-nmda-and-kainate-glutamate-receptor-subunits-are-expressed-in-human-peripheral-blood-mononuclear-cells-pbmcs-where-the-expression-of-gluk4-is-altered-by-pregnancy-and-glun2d-by-depression-in-pregnant-women
#10
Amol K Bhandage, Zhe Jin, Charlotte Hellgren, Sergiy V Korol, Krzysztof Nowak, Louise Williamsson, Inger Sundström-Poromaa, Bryndis Birnir
The amino acid glutamate opens cation permeable ion channels, the iGlu receptors. These ion channels are abundantly expressed in the mammalian brain where glutamate is the main excitatory neurotransmitter. The neurotransmitters and their receptors are being increasingly detected in the cells of immune system. Here we examined the expression of the 18 known subunits of the iGlu receptors families; α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), kainate, N-methyl-d-aspartate (NMDA) and delta in human peripheral blood mononuclear cells (PBMCs)...
April 15, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/28275719/a-negative-allosteric-modulator-for-%C3%AE-5-subunit-containing-gaba-receptors-exerts-a-rapid-and-persistent-antidepressant-like-action-without-the-side-effects-of-the-nmda-receptor-antagonist-ketamine-in-mice
#11
Panos Zanos, Mackenzie E Nelson, Jaclyn N Highland, Samuel R Krimmel, Polymnia Georgiou, Todd D Gould, Scott M Thompson
New antidepressant pharmacotherapies that provide rapid relief of depressive symptoms are needed. The NMDA receptor antagonist ketamine exerts rapid antidepressant actions in depressed patients but also side effects that complicate its clinical utility. Ketamine promotes excitatory synaptic strength, likely by producing high-frequency correlated activity in mood-relevant regions of the forebrain. Negative allosteric modulators of GABA-A receptors containing α5 subunits (α5 GABA-NAMs) should also promote high-frequency correlated electroencephalogram (EEG) activity and should therefore exert rapid antidepressant responses...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28274152/restraint-stress-differentially-regulates-inflammation-and-glutamate-receptor-gene-expression-in-the-hippocampus-of-c57bl-6-and-balb-c-mice
#12
Monica Sathyanesan, Jacob M Haiar, Michael J Watt, Samuel S Newton
The inbred mouse strains, C57BL/6 and BALB/c have been used widely in preclinical psychiatric research. The differences in stress susceptibility of available strains has provided a useful platform to test pharmacological agents and behavioral responses. Previous brain gene profiling efforts have indicated that the inflammation and immune response gene pathway is the predominant gene network in the differential stress response of BALB/c and C57BL/6 mice. The implication is that a composite stress paradigm that includes a sequence of extended, varied and unpredictable stressors induces inflammation-related genes in the hippocampus...
March 8, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28272791/snat3-mediated-glutamine-transport-in-perisynaptic-astrocytes-in-situ-is-regulated-by-intracellular-sodium
#13
Alison C Todd, Mari-Carmen Marx, Sarah R Hulme, Stefan Bröer, Brian Billups
The release of glutamine from astrocytes adjacent to synapses in the central nervous system is thought to play a vital role in the mechanism of glutamate recycling and is therefore important for maintaining excitatory neurotransmission. Here we investigate the nature of astrocytic membrane transport of glutamine in rat brainstem slices, using electrophysiological recording and fluorescent imaging of pHi and Nai+. Glutamine application to perisynaptic astrocytes induced a membrane current, caused by activation of system A (SA) family transporters...
March 8, 2017: Glia
https://www.readbyqxmd.com/read/28270751/understanding-the-role-of-gpcr-heteroreceptor-complexes-in-modulating-the-brain-networks-in-health-and-disease
#14
REVIEW
Dasiel O Borroto-Escuela, Jens Carlsson, Patricia Ambrogini, Manuel Narváez, Karolina Wydra, Alexander O Tarakanov, Xiang Li, Carmelo Millón, Luca Ferraro, Riccardo Cuppini, Sergio Tanganelli, Fang Liu, Malgorzata Filip, Zaida Diaz-Cabiale, Kjell Fuxe
The introduction of allosteric receptor-receptor interactions in G protein-coupled receptor (GPCR) heteroreceptor complexes of the central nervous system (CNS) gave a new dimension to brain integration and neuropsychopharmacology. The molecular basis of learning and memory was proposed to be based on the reorganization of the homo- and heteroreceptor complexes in the postjunctional membrane of synapses. Long-term memory may be created by the transformation of parts of the heteroreceptor complexes into unique transcription factors which can lead to the formation of specific adapter proteins...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28267198/serotonergic-transmission-at-merkel-discs-modulation-by-exogenously-applied-chemical-messengers-and-involvement-of-ih-currents
#15
Weipang Chang, Hirosato Kanda, Ryo Ikeda, Jennifer Ling, Jianguo G Gu
The Merkel disc is a main type of tactile end organ consisting of Merkel cells and Aβ-afferent endings that responds to tactile stimulation with slowly adapting type 1 (SA1) afferent impulses. Our recent study has shown that Merkel discs in whisker hair follicles are serotonergic synapses using endogenous serotonin to transmit tactile signals from Merkel cells to Aβ-afferent endings. In the present study, we hypothesize that tactile sensitivity of Merkel discs can be modulated by chemical messengers. We tested this hypothesis by determining whether and how SA1 responses of mouse whisker hair follicles may be affected by exogenously applied chemical messengers...
March 7, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28263869/does-aging-alter-the-molecular-substrate-of-ionotropic-neurotransmitter-receptors-in-the-rostral-ventral-lateral-medulla-a-short-communication
#16
Hitesh N Pawar, Sivasai Balivada, Michael J Kenney
Aging alters sympathetic nervous system (SNS) regulation, although central mechanisms are not well understood. In young rats the rostral ventral lateral medulla (RVLM) is critically involved in central SNS regulation and RVLM neuronal activity is mediated by a balance of excitatory and inhibitory ionotropic neurotransmitters and receptors, providing the foundation for hypothesizing that with advanced age the molecular substrate of RVLM ionotropic receptors is characterized by upregulated excitatory and downregulated inhibitory receptor subunits...
March 2, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28256580/par1-activation-induces-rapid-changes-in-glutamate-uptake-and-astrocyte-morphology
#17
Amanda M Sweeney, Kelsey E Fleming, John P McCauley, Marvin F Rodriguez, Elliot T Martin, Alioscka A Sousa, Richard D Leapman, Annalisa Scimemi
The G-protein coupled, protease-activated receptor 1 (PAR1) is a membrane protein expressed in astrocytes. Fine astrocytic processes are in tight contact with neurons and blood vessels and shape excitatory synaptic transmission due to their abundant expression of glutamate transporters. PAR1 is proteolytically-activated by bloodstream serine proteases also involved in the formation of blood clots. PAR1 activation has been suggested to play a key role in pathological states like thrombosis, hemostasis and inflammation...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28255675/co-localization-of-the-cannabinoid-type-1-receptor-with-corticotropin-releasing-factor-containing-afferents-in-the-noradrenergic-nucleus-locus-coeruleus-implications-for-the-cognitive-limb-of-the-stress-response
#18
Ryan R Wyrofsky, Beverly A S Reyes, Elisabeth J Van Bockstaele
The noradrenergic system has been shown to play a key role in the regulation of stress responses, arousal, mood, and emotional states. Corticotropin-releasing factor (CRF) is a primary mediator of stress-induced activation of noradrenergic neurons in the nucleus locus coeruleus (LC). The endocannabinoid (eCB) system also plays a key role in modulating stress responses, acting as an "anti-stress" neuro-mediator. In the present study, we investigated the cellular sites for interactions between the cannabinoid receptor type 1 (CB1r) and CRF in the LC...
March 2, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28254829/inhibition-of-the-mitochondrial-pyruvate-carrier-protects-from-excitotoxic-neuronal-death
#19
Ajit S Divakaruni, Martina Wallace, Caodu Buren, Kelly Martyniuk, Alexander Y Andreyev, Edward Li, Jerel A Fields, Thekla Cordes, Ian J Reynolds, Brenda L Bloodgood, Lynn A Raymond, Christian M Metallo, Anne N Murphy
Glutamate is the dominant excitatory neurotransmitter in the brain, but under conditions of metabolic stress it can accumulate to excitotoxic levels. Although pharmacologic modulation of excitatory amino acid receptors is well studied, minimal consideration has been given to targeting mitochondrial glutamate metabolism to control neurotransmitter levels. Here we demonstrate that chemical inhibition of the mitochondrial pyruvate carrier (MPC) protects primary cortical neurons from excitotoxic death. Reductions in mitochondrial pyruvate uptake do not compromise cellular energy metabolism, suggesting neuronal metabolic flexibility...
March 2, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28245819/effects-of-sarcosine-and-n-n-dimethylglycine-on-nmda-receptor-mediated-excitatory-field-potentials
#20
Mei-Yi Lee, Yi-Ruu Lin, Yi-Shu Tu, Yufeng Jane Tseng, Ming-Huan Chan, Hwei-Hsien Chen
BACKGROUND: Sarcosine, a glycine transporter type 1 inhibitor and an N-methyl-D-aspartate (NMDA) receptor co-agonist at the glycine binding site, potentiates NMDA receptor function. Structurally similar to sarcosine, N,N-dimethylglycine (DMG) is also N-methyl glycine-derivative amino acid and commonly used as a dietary supplement. The present study compared the effects of sarcosine and DMG on NMDA receptor-mediated excitatory field potentials (EFPs) in mouse medial prefrontal cortex brain slices using a multi-electrode array system...
February 28, 2017: Journal of Biomedical Science
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