Gria1

..Here, we developed a new approach to address these issues. The LIVBP domain of the GluR1 subunit of AMPA receptors was replaced by leucine-zipper peptides designed to form stable symmetric dimers, ..

..Within NTS, the GluR1 subunit of the AMPA receptor is found primarily in dendritic spines...

..We report in the present study a 2.5 Å (1 Å=0.1 nm) resolution crystal structure of the ATD of GluA1. Comparative analyses of the structure of GluA1-ATD and other subunits sheds light on our understanding of how ATD ..

..Thus, the encoding of memories in the lateral amygdala is mediated by AMPA receptor trafficking, is widely distributed, and displays little redundancy...

..Using a quantitative assay of net serine 845 (Ser-845) phosphorylation in the GluR1 subunit of AMPARs, we investigated the relationship between phospho-Ser-845, GluR1 surface expression, and ..

..It provides a potential mechanism underlying the role of corticosteroid stress hormone in up-regulating excitatory synaptic efficacy in cortical neurons...

The regulated trafficking of GluR1 contributes significantly to synaptic plasticity, but studies addressing the function of the GluR1 C-terminal PDZ-ligand domain in this process have produced conflicting results...

..These results demonstrate that cornichons are intrinsic auxiliary subunits of native AMPARs and provide previously unknown molecular determinants for glutamatergic neurotransmission in the central nervous system...

..study, we investigated the regulation of alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptor GluR1 subunit phosphorylation by the stimulation of group I metabotropic glutamate receptors (mGluRs) in the rat dorsal ..

..We examined whether PS modulated the excitatory transmission and expression of glutamate receptor subtypes and phosphorylated extracellular signal-regulated kinases (p-ERK1/2)...

..CIH -238 +/- 27 beats/min, P < 0.05); and 3) the number of NMDAR1, AMPA GluR1, and AMPA GluR2/3-immunoreactive cells in the NA was reduced (P < 0.05)...

..Physiological regulation of postsynaptic receptor mobility affects the fidelity of synaptic transmission by shaping the frequency dependence of synaptic responses...

The present study aims to investigate changes of spinal cord AMPA receptor GluR1 and its phosphorylation in inflammatory and neuropathic pain...

..AMPA receptors form heterotetramers of four homologous subunits (GluR1-4), which exist in two functionally different isoforms, flip and flop, generated by alternative splicing...

..were associated with parallel alterations in expression levels and/or phosphorylation changes in the NR2B and GluR1 subunits of the respective NMDA and AMPA receptors...

..combined methods of biochemistry and electrophysiology, we examined the effects of nobiletin on phosphorylation of GluR1 receptor, the subunit of alpha-amino-3-hydroxy-5-methyl-D-aspartate (AMPA) receptors, and the receptor-mediated ..

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..Instead, NrbI-targeted PP1 facilitates LTD by dephosphorylating GluR1 at both serine 845 and serine 831, with GluR2 serine 880 phosphorylation unaltered...

..Moreover, GluR1-containing AMPA-Rs traffic selectively into intracortical synapses, and this process requires sensory experience-..

..Both antidepressants increased the interaction of GluR1 subunit with stargazin and of GluR2/3 with NSF...

..Thus, our findings link genetic deficits in OPHN1 to glutamatergic dysfunction and suggest that defects in early circuitry development are an important contributory factor to this form of MR...

..By directly visualizing individual insertion events of the AMPAR subunit GluR1 in rodents, we found that the protein 4.1N was required for activity-dependent GluR1 insertion...

..Consistent with these findings, preventing GluR1 phosphorylation with the alanine mutant GluR1(S845A) reduces glutamate-evoked currents in cultured medium spiny ..

..After stress, the phosphorylation of Ser831-GluA1 was markedly decreased in the mPFC and DH, whereas the phosphorylation of Ser845-GluA1 was increased in the ..

..Furthermore, an increased distribution of the synaptic GluR1 subunit was observed in the ACC neurons...

..that the enhanced levels of phosphorylated α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptor GluR1 subunits at Serine-831 (pGluR1-Ser-831) and Serine-845 (pGluR1-Ser-845) in the spinal cord dorsal horn are ..

..Treatment with GSK-3 inhibitors also decreased surface and synaptic GluR1 clusters on dendrites and increased internalized GluR1 in cortical cultures...

..A reduction of phosphorylation of GluR1 at serine 845 (pSer(845)) is shown to occur after both pharmacological and genetic manipulations of MCHR1 activity...

To study the effect of behavioral training on the learning and memory abilities and changes of NR2B and GluR1 expressions in the hippocampus of offspring rats with fetal growth retardation (FGR).

..Expression of glutamate receptors such as GluA1 and GluN2A was also suppressed in IUGR-rat cultures...

..viral expression of pABP-L increased AMPAR mediated mEPSC amplitude and frequency and elevated surface levels of GluR1 and GluR2, suggesting an increase in AMPA receptors at individual synapses...

The localization of GluR1 subunits of ionotropic glutamate receptors in the glial cells and inhibitory neurons of cerebellar cortex and their association with the climbing and parallel fibers, and basket cell axons were studied...

Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) promotes trafficking and activation of the GluR1 subunit of alpha-amino- 3-hydroxy-5-methyl-4-isoxazolepropionic acid-type glutamate receptors (AMPARs) during synaptic plasticity...

..We analyzed the impact of the resulting chimeras on GluR1 functional properties in Xenopus oocytes and HEK293 cells...

..We used this approach as an example for applications to quantify the expression of GluR1 and GluR2 subunit mRNAs of the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor in the ..

..Both EXP1 and EXP2 rats had a higher amount of glutamate receptor 1 (GluR1) and lower amount of the ratio of GluR2/GluR1 in hippocampus when compared with CONT rats...

..Long-term exposure to 20 nM TBT decreased the mRNA expression of glutamate receptors NR1, NR2A, GluR1 and GluR2, and increased that of NR2B, GluR3 and GluR4...

..The results are consistent the hypothesis that the efficacy is determined at least in part by the stability of the state in which the lobes are fully closed...

..Taken together, these studies identify a novel mechanism for mGluR desensitization and an additional biochemical link between altered glutamate receptor signaling and Huntington disease...

..In vivo gene delivery was combined with in vitro recordings to show that experience drives recombinant GluR1, an AMPA-R subunit, into synapses formed between layer 4 and layer 2/3 neurons...

..The approximately 600-nt intron 13 of gluR-C was particularly remarkable, showing >94% nucleotide identity between human and chicken, organisms estimated to have diverged 310 million years ago...

..This did not require ion flux or intracellular second messengers. This allosteric mechanism for AMPA receptor dissociation from TARPs may participate in glutamate-mediated internalization of receptors in synaptic plasticity...

..ischemia/reperfusion leads to alterations in the expression of AMPA-type glutamate receptor (AMPAR) subunits GluR1-4...

..Here, using virally expressed green fluorescent protein (GFP)-GluR1 and GFP-GluR2 and confocal photobleach techniques we show near real-time movement of these subunits in living ..

..of alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionic acid (AMPA)-receptor glutamate receptor-1 (GluR1) and related protein kinases in rat hippocampus on postnatal days (PND) 1-28...

..In hippocampus, most AMPA-Rs are hetero-oligomers composed of GluR1/GluR2 or GluR2/GluR3 subunits. Here we show that these AMPA-R forms display different synaptic delivery mechanisms...

..on the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors, heteromerically formed of GluR1,2 (GluR1 and GluR2), GluR1,3 (GluR1 and GluR3), and GluR1,2,3 (GluR1, GluR2, and GluR3), expressed in Xenopus ..

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..we used dual immunolabeling and electron microscopy to examine the distribution of alpha7nAChR relative to AMPAR (GluR1, GluR2, and GluR3 subunits combined) at excitatory synapses in somatosensory cortex of adult and 1-week-old rats...

..We demonstrate that the AMPA receptor subunits GluR1 and GluR2 are expressed and organized in functional receptors in axonal growth cones of hippocampal neurons...

..GluR2/3 was found at pre- and postsynaptic sites, and in astrocytic glia; while GluR1 was found primarily in small dendrites and spines...

..The intracellular accumulation of GluR2 and GluR3 but not GluR1 is enhanced by AMPA, NMDA, or synaptic activity...

..dissimilar, antimanic agents lithium and valproate regulate synaptic expression of AMPA receptor subunit glutamate receptor 1 (GluR1)...

..Collectively, these findings support a role for GRIP in the synaptic anchoring of AMPA receptors but also suggest that GRIP has additional functions unrelated to the binding of AMPA receptors...

Three closely related genes, GluR1, GluR2, and GluR3, encode receptor subunits for the excitatory neurotransmitter glutamate...

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..generated two phosphorylation site-specific antibodies to analyze the phosphorylation of the glutamate receptor GluR1 subunit. These antibodies recognize GluR1 only when it is phosphorylated on serine residues 831 or 845...

..Electrophysiological analysis revealed a predominant reduction of inhibitory synaptic function. Thus, neuroligins control the formation and functional balance of excitatory and inhibitory synapses in hippocampal neurons...

..These results establish stargazin as a critical substrate in the bidirectional control of synaptic strength, which is thought to underlie aspects of learning and memory...

..assembly and surface expression, we have epitope-tagged the N-terminal domain of the AMPA receptor subunit, GluR1, and expressed it in human embryonic kidney 293 cells and hippocampal neurons...

..Another peptide containing Thr-692 of a rat GluRA, clone almost identical to GluR1, was phosphorylated by PKC but not by PKG...

..Immunoreactive gold particles for AMPA receptor subunits GluR1 and GluR2/3 were frequently found not only on postsynaptic but also on presynaptic profiles immunopositive for ..

..We found outstanding decreases in GluR1 and GluR2 mRNA levels after global ischemia and 48 h reperfusion (I/R) in all the areas studied, however, protein ..

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..cells and cerebellar neurons to investigate whether CXC chemokine receptor 2 (CXCR2) is functionally coupled to GluR1. The co-expression of CXCR2 with GluR1 in HEK cells increased (i) the GluR1 "apparent" affinity for the ..

..with enhanced PSD-95 and synapsin I protein expression as well as enhanced Ser(845) phosphorylation of the GluR1 subunit on withdrawal day. Silencing ILK expression under both paradigms prevented or reversed these changes...

..syntenin with mGluR7a, mGluR4a, and mGluR6; (ii) PICK1 and GRIP with mGluR3; and (iii) syntenin with all forms of GluR1-4 and mGluR7b...

..studies indicate that phosphorylation of AMPA receptors is enhanced by a SAP97-AKAP79 complex that directs PKA to GluR1 via a PDZ domain interaction...

..In this study we investigated by immunocytochemistry at the light and electron microscopy level the expression of GluR1 and its scaffolding proteins SAP97 (synapse-associated protein) and 4.1N during cerebellar development...

..However, silenced neurons could not recruit the AMPA-type glutamate receptor subunit GluR1 as efficiently when competing with active neighbors...

Synaptic delivery of GluR-A (GluR1) subunit-containing glutamate receptors depends on a C-terminal type I PDZ binding motif in GluR-A. Synapse-associated protein 97 (SAP97) is the only PDZ domain protein known to associate with GluR-A...

..We therefore used immunolabeling to assess the frequency and abundance of GluR1 and GluR2, the most common AMPA subunits in striatum, in the main striatal neuron types...

..As GluR1-containing AMPARs are critical for activity-dependent alterations in excitatory strength, we sought to determine ..

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..of activation of AMPA receptors in dendritic outgrowth of spinal motor neurons by overexpression of two subunits, GluR1 and GluR2, and find that dendrite outgrowth is differentially controlled by expression of these subunits...

..These results demonstrate the existence of synaptic specificity and the crucial role of AMPAR-gated calcium in homeostatic plasticity in central neurons...

..kinase isoform 3 (SGK3) and stargazin have both been shown to enhance the synaptic expression level of GluR1. The present study was performed to elucidate whether SGK3 and stargazin interact or are effective through ..

..this brain region, we assessed expression of the NR1 subunit of the N-methyl-D-aspartate (NMDA) receptor and the GluR1 subunit of the alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptor in the NAcc core and shell ..

..99%) glutamatergic postsynaptic membranes expressed GluR2, and most of them (87%) were also immunoreactive for GluR1. The numbers of gold particles for pan-AMPA, NR1, and GluR2 subunits showed a linear correlation with the size of ..

..However, phosphorylation of Ser-845 on the AMPA receptor subunit GluR1 was significantly decreased throughout the neuron, including in the synaptic membrane-enriched fraction...

..In the spinal cord under normal circumstances, the AMPA receptor subunit GluR1 is expressed at high levels by motor neurons and surrounding interneurons during this critical developmental ..

..1+/-0.08). Cells triple labeled for FG, nNOS, and Group I mGluRs were identified in the NTS. Thus, these data provide an anatomical substrate by which Group I mGluRs could modulate activity of CVLM projecting neurons in the NTS...

..These results further support that steroid hormones, through their modulation of AMPA and NMDA receptors, may be involved in the control of synaptic efficacy and, therefore, influence learning and memory...

..These results identify a switch in the molecular and functional properties of glutamate receptors operated by alternative splicing...

..training during withdrawal from chronic cocaine self-administration induces experience-dependent increases in the GluR1 and GluR2/3 subunits of AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate) glutamate receptors in the ..

..Here, we examine the consequences of targeted deletion of the gene encoding GluR1 subunits of AMPA receptors (gria1 knockouts (KO)) on cocaine self-administration and on the ability of cocaine-..

..populations and associates with the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate-type glutamate receptor subunit GluR1. In developing hippocampal neurons, expression of the tail domain of myosin Vb, but not myosin Va, ..

The GluR1 glutamate receptor subunit is expressed in most brain areas and plays a major role in excitatory synaptic transmission...

..is also associated with a shift toward inward rectification of synaptic currents and increased expression of GluR1, but not GluR2, subunits, suggesting augmented membrane incorporation of GluR1-containing, GluR2-lacking AMPARs...

..The developmental pattern of AMPAR-GluR1 was similar to that of NMDAR-NR2B, with high expression at P5, and modest increases thereafter...

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..Together the studies will determine the subcellular localization of glutamate receptors and MORs in trigeminal pathways that may be targets for new therapeutic strategies to control trigeminal pain. ..

..In our previous studies of AMPA receptors we made a surprising discovery: the number of GluR1 receptor subunits significantly increases in NTS following the development of hypertension...

..Lay summary: In CF, genetic mutation prevents the CFTR protein from functioning correctly, leading to chronic lung infection and death. We seek chemicals that can correct this functional defect. ..

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..Other sources of ocular pain include dry eye, uveitis, and contact lens use. The studies in this proposal are designed to understand the neural pathways involved in transmitting pain from the cornea to the brain. ..

..Lay summary: In CF, genetic mutation prevents the CFTR protein from functioning correctly, leading to chronic lung infection and death. We seek chemicals that can correct this functional defect. ..

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..Other sources of ocular pain include dry eye, uveitis, and contact lens use. The studies in this proposal are designed to understand the neural pathways involved in transmitting pain from the cornea to the brain. ..

..by examining electrophysiologically tagged recombinant AMPA-R-mediated currents, measuring synaptic responses in GluR1 and GluR2 knockout mice, as well as quantifying phosphorylated or active endogenous signaling molecules and ..

..We believe that these basic studies on the molecular and cellular mechanisms of synaptic plasticity will contribute to further our understanding of the physiological processes and pathological alterations affecting cognitive function. ..

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..Expected findings should evolve new principles and lead to novel compounds that can be used as much-needed innovative treatments for ADHD and other major neuropsychiatric disorders. ..

..The long-term goal of this project is to understand the cellular basis for receptor modulation of central autonomic neuronal activity. ..

..Expected findings should lead to novel compounds that can be developed as much needed innovative non-stimulant treatments for ADHD and other major neuropsychiatric disorders. ..

..adult rats, and should evolve new principles for improved treatments for childhood-onset schizophrenia and other major pediatric psychiatric disorders. ..

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