keyword
MENU ▼
Read by QxMD icon Read
search

AMPAR

keyword
https://www.readbyqxmd.com/read/28453662/mglur5-tunes-ngf-trka-signaling-to-orient-spiny-stellate-neuron-dendrites-toward-thalamocortical-axons-during-whisker-barrel-map-formation
#1
Jui-Yen Huang, Hui-Chen Lu
Neurons receive and integrate synaptic inputs at their dendrites, thus dendritic patterning shapes neural connectivity and behavior. Aberrant dendritogenesis is present in neurodevelopmental disorders such as Down's syndrome and autism. Abnormal glutamatergic signaling has been observed in these diseases, as has dysfunction of the metabotropic glutamate receptor 5 (mGluR5). Deleting mGluR5 in cortical glutamatergic neurons disrupted their coordinated dendritic outgrowth toward thalamocortical axons and perturbed somatosensory circuits...
April 27, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28416811/gene-deficiency-and-pharmacological-inhibition-of-caspase-1-confers-resilience-to-chronic-social-defeat-stress-via-regulating-the-stability-of-surface-ampars
#2
M-X Li, H-L Zheng, Y Luo, J-G He, W Wang, J Han, L Zhang, X Wang, L Ni, H-Y Zhou, Z-L Hu, P-F Wu, Y Jin, L-H Long, H Zhang, G Hu, J-G Chen, F Wang
Both inflammatory processes and glutamatergic systems have been implicated in the pathophysiology of mood-related disorders. However, the role of caspase-1, a classic inflammatory caspase, in behavioral responses to chronic stress remains largely unknown. To address this issue, we examined the effects and underlying mechanisms of caspase-1 on preclinical murine models of depression. We found that loss of caspase-1 expression in Caspase-1(-/-) knockout mice alleviated chronic stress-induced depression-like behaviors, whereas overexpression of caspase-1 in the hippocampus of wild-type (WT) mice was sufficient to induce depression- and anxiety-like behaviors...
April 18, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28412220/inflammation-induced-glua1-trafficking-and-membrane-insertion-of-ca-2-permeable-ampa-receptors-in-dorsal-horn-neurons-is-dependent-on-spinal-tumor-necrosis-factor-pi3-kinase-and-protein-kinase-a
#3
G Wigerblad, J R Huie, H Z Yin, M Leinders, R A Pritchard, F J Koehrn, W-H Xiao, G J Bennett, R L Huganir, A R Ferguson, J H Weiss, C I Svensson, L S Sorkin
Peripheral inflammation induces sensitization of nociceptive spinal cord neurons. Both spinal tumor necrosis factor (TNF) and neuronal membrane insertion of Ca(2+) permeable AMPA receptor (AMPAr) contribute to spinal sensitization and resultant pain behavior, molecular mechanisms connecting these two events have not been studied in detail. Intrathecal (i.t.) injection of TNF-blockers attenuated paw carrageenan-induced mechanical and thermal hypersensitivity. Levels of GluA1 and GluA4 from dorsal spinal membrane fractions increased in carrageenan-injected rats compared to controls...
April 12, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28401316/the-orally-active-noncompetitive-ampar-antagonist-perampanel-attenuates-focal-cerebral-ischemia-injury-in-rats
#4
Hong-Xia Niu, Jun-Zhe Wang, Dong-Liang Wang, Jun-Jie Miao, Hua Li, Zhi-Gang Liu, Xing Yuan, Wei Liu, Jing-Ru Zhou
Inhibition of ionotropic glutamate receptors (iGluRs) is a potential target of therapy for ischemic stroke. Perampanel is a potent noncompetitive α-amino-3-hydroxy-5-methyl-4-isoxazole propionate receptor (AMPAR) antagonist with good oral bioavailability and favorable pharmacokinetic properties. Here, we investigated the potential protective effects of perampanel against focal cerebral ischemia in a middle cerebral artery occlusion (MCAO) model in rats. Oral administration with perampanel significantly reduced MCAO-induced brain edema, brain infarct volume, and neuronal apoptosis...
April 11, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28397107/the-number-and-distribution-of-ampa-receptor-channels-containing-fast-kinetic-glua3-and-glua4-subunits-at-auditory-nerve-synapses-depend-on-the-target-cells
#5
María E Rubio, Ko Matsui, Yugo Fukazawa, Naomi Kamasawa, Harumi Harada, Makoto Itakura, Elek Molnár, Manabu Abe, Kenji Sakimura, Ryuichi Shigemoto
The neurotransmitter receptor subtype, number, density, and distribution relative to the location of transmitter release sites are key determinants of signal transmission. AMPA-type ionotropic glutamate receptors (AMPARs) containing GluA3 and GluA4 subunits are prominently expressed in subsets of neurons capable of firing action potentials at high frequencies, such as auditory relay neurons. The auditory nerve (AN) forms glutamatergic synapses on two types of relay neurons, bushy cells (BCs) and fusiform cells (FCs) of the cochlear nucleus...
April 10, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28387242/chemical-labelling-for-visualizing-native-ampa-receptors-in-live-neurons
#6
Sho Wakayama, Shigeki Kiyonaka, Itaru Arai, Wataru Kakegawa, Shinji Matsuda, Keiji Ibata, Yuri L Nemoto, Akihiro Kusumi, Michisuke Yuzaki, Itaru Hamachi
The location and number of neurotransmitter receptors are dynamically regulated at postsynaptic sites. However, currently available methods for visualizing receptor trafficking require the introduction of genetically engineered receptors into neurons, which can disrupt the normal functioning and processing of the original receptor. Here we report a powerful method for visualizing native α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-type glutamate receptors (AMPARs) which are essential for cognitive functions without any genetic manipulation...
April 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/28385956/deconstructing-behavioral-neuropharmacology-with-cellular-specificity
#7
Brenda C Shields, Elizabeth Kahuno, Charles Kim, Pierre F Apostolides, Jennifer Brown, Sarah Lindo, Brett D Mensh, Joshua T Dudman, Luke D Lavis, Michael R Tadross
Behavior has molecular, cellular, and circuit determinants. However, because many proteins are broadly expressed, their acute manipulation within defined cells has been difficult. Here, we combined the speed and molecular specificity of pharmacology with the cell type specificity of genetic tools. DART (drugs acutely restricted by tethering) is a technique that rapidly localizes drugs to the surface of defined cells, without prior modification of the native target. We first developed an AMPAR antagonist DART, with validation in cultured neuronal assays, in slices of mouse dorsal striatum, and in behaving mice...
April 7, 2017: Science
https://www.readbyqxmd.com/read/28377502/glua1-ubiquitination-mediates-amyloid-%C3%AE-induced-loss-of-surface-ampa-receptors
#8
Sumasri Guntupalli, Se Eun Jang, Tianyi Zhu, Richard L Huganir, Jocelyn Widagdo, Victor Anggono
The accumulation of soluble amyloid-beta (Aβ) peptides produces profound neuronal changes in the brain during the pathogenesis of Alzheimer's disease. Excessive levels of Aβ disrupt excitatory synaptic transmission by promoting the removal of synaptic AMPA receptors (AMPARs), dendritic spine loss and synaptic depression. Recently, activity-dependent ubiquitination of the GluA1 subunit has been shown to regulate the intracellular sorting of AMPARs toward late endosomes for degradation. However, whether this ubiquitin signalling pathway mediates Aβ-induced loss of surface AMPARs is unknown...
April 4, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28377128/enhanced-ampa-receptor-mediated-neurotransmission-on-ca1-pyramidal-neurons-during-status-epilepticus
#9
Suchitra Joshi, Karthik Rajasekaran, Huayu Sun, John Williamson, Jaideep Kapur
Status epilepticus (SE) is a common neurological emergency that results from the failure of the mechanisms responsible for seizure termination or the initiation of mechanisms that lead to abnormally prolonged seizures. Although the failure of inhibitory mechanisms during SE is well understood, the seizure-initiating mechanisms are poorly understood. We tested whether hippocampal α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR)-mediated transmission was enhanced during SE and assessed the underlying molecular mechanism...
April 2, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28376410/diversity-in-ampa-receptor-complexes-in-the-brain
#10
REVIEW
Eric Jacobi, Jakob von Engelhardt
AMPA receptor (AMPAR) complexes comprise four of the AMPAR subunits GluA1-4 and several additional interacting proteins. Subunit composition determines AMPAR function. However, AMPAR function depends to a large extent also on interacting proteins, which influence trafficking to the cell surface, activity-dependent subcellular localization and gating of AMPARs. In this review we report about recent findings on the diversity of AMPAR complexes that allow us to better understand functional properties of native receptors in the brain...
April 1, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28358902/screening-for-ampa-receptor-auxiliary-subunit-specific-modulators
#11
Caleigh M Azumaya, Emily L Days, Paige N Vinson, Shaun Stauffer, Gary Sulikowski, C David Weaver, Terunaga Nakagawa
AMPA receptors (AMPAR) are ligand gated ion channels critical for synaptic transmission and plasticity. Their dysfunction is implicated in a variety of psychiatric and neurological diseases ranging from major depressive disorder to amyotrophic lateral sclerosis. Attempting to potentiate or depress AMPAR activity is an inherently difficult balancing act between effective treatments and debilitating side effects. A newly explored strategy to target subsets of AMPARs in the central nervous system is to identify compounds that affect specific AMPAR-auxiliary subunit complexes...
2017: PloS One
https://www.readbyqxmd.com/read/28336441/chronic-stress-induced-dendritic-reorganization-and-abundance-of-synaptosomal-pka-dependent-cp-ampa-receptor-in-the-basolateral-amygdala-in-a-mouse-model-of-depression
#12
Eun-Surk Yi, Seikwan Oh, Jang-Kyu Lee, Yea-Hyun Leem
Chronic stress is a precipitating factor for disorders including depression. The basolateral amygdala (BLA) is a critical substrate that interconnects with stress-modulated neural networks to generate emotion- and mood-related behaviors. The current study shows that 3 h per day of restraint stress for 14 days caused mice to exhibit long-term depressive behaviors, manifested by disrupted sociality and despair levels, which were rescued by fluoxetine. These behavioral changes corresponded with morphological and molecular changes in BLA neurons, including chronic stress-elicited increases in arborization, dendritic length, and spine density of BLA principal neurons...
March 20, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28304288/changes-in-synaptic-plasticity-and-glutamate-receptors-in-type-2-diabetic-kk-ay-mice
#13
Huajing Yin, Weiping Wang, Wenwen Yu, Jiang Li, Nan Feng, Ling Wang, Xiaoliang Wang
In the present study, the progressive alteration of cognition and the mechanisms of reduction in long-term potentiation (LTP) in spontaneous obese KK-Ay type 2 diabetic mice were investigated. In the study, 3-, 5-, and 7-month-old KK-Ay mice were used. The results indicated that KK-Ay mice showed cognitive deficits in the Morris water maze test beginning at the age of 3 months. LTP was significantly impaired in KK-Ay mice during whole study period (3 to 7 months). The above deficits were reversible at an early stage (3 to 5 months old) by diet intervention...
2017: Journal of Alzheimer's Disease: JAD
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
#14
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/28294131/structural-and-functional-plasticity-within-the-nucleus-accumbens-and-prefrontal-cortex-associated-with-time-dependent-increases-in-food-cue-seeking-behavior
#15
Paige M Dingess, Rebecca A Darling, Rifka C Derman, Shaun S Wulff, Melissa L Hunter, Carrie R Ferrario, Travis E Brown
Urges to consume food can be driven by stimuli in the environment that are associated with previous food experience. Identifying adaptations within brain reward circuits that facilitate cue-induced food seeking is critical for understanding and preventing the overconsumption of food and subsequent weight gain. Utilizing electrophysiological, biochemical, and DiI labeling we examined functional and structural changes in the nucleus accumbens (NAc) and prefrontal cortex (PFC) associated with time-dependent increases in food craving ('incubation of craving')...
March 15, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28293483/hippocampal-ampars-involve-the-central-sensitization-of-rats-with-irritable-bowel-syndrome
#16
Aiqin Chen, Yu Chen, Ying Tang, Chengjia Bao, Zizhi Cui, Meng Xiao, Chun Lin
OBJECTIVE: The roles of hippocampal AMPARs were investigated in irritable bowel syndrome (IBS)-like rats to clarify the central sensitization mechanisms. METHODS: IBS model was induced by neonatal maternal separation. The effects of AMPARs on visceral hypersensitivity were examined by the responses of abdominal muscle to colorectal distension after the bilateral intrahippocampal injections of CNQX (an AMPAR inhibitor). The expressions of hippocampal AMPARs (GluR1 and GluR2) were determined by Western blot...
March 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28290985/synaptic-transmission-and-plasticity-require-ampa-receptor-anchoring-via-its-n-terminal-domain
#17
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
#18
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/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
#19
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/28272206/limbic-encephalitis-associated-with-anti-nh2-terminal-of-%C3%AE-enolase-antibodies-a-clinical-subtype-of-hashimoto-encephalopathy
#20
Toru Kishitani, Akiko Matsunaga, Masamichi Ikawa, Kouji Hayashi, Osamu Yamamura, Tadanori Hamano, Osamu Watanabe, Keiko Tanaka, Yasunari Nakamoto, Makoto Yoneda
Several types of autoantibodies have been reported in autoimmune limbic encephalitis (LE), such as antibodies against the voltage-gated potassium channel (VGKC) complex including leucine-rich glioma inactivated 1 (LGI1). We recently reported a patient with autoimmune LE and serum anti-NH2-terminal of α-enolase (NAE) antibodies, a specific diagnostic marker for Hashimoto encephalopathy (HE), who was diagnosed with HE based on the presence of antithyroid antibodies and responsiveness to immunotherapy. This case suggests that LE patients with antibodies to both the thyroid and NAE could be diagnosed with HE and respond to immunotherapy...
March 2017: Medicine (Baltimore)
keyword
keyword
96373
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"