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https://www.readbyqxmd.com/read/28978486/grip1-binds-to-apoer2-and-ephrinb2-to-induce-activity-dependent-ampa-receptor-insertion-at-the-synapse
#1
Sylvia Pfennig, Franziska Foss, Diane Bissen, Eva Harde, Julia C Treeck, Marta Segarra, Amparo Acker-Palmer
Regulation of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor trafficking in response to neuronal activity is critical for synaptic function and plasticity. Here, we show that neuronal activity induces the binding of ephrinB2 and ApoER2 receptors at the postsynapse to regulate de novo insertion of AMPA receptors. Mechanistically, the multi-PDZ adaptor glutamate-receptor-interacting protein 1 (GRIP1) binds ApoER2 and bridges a complex including ApoER2, ephrinB2, and AMPA receptors. Phosphorylation of ephrinB2 in a serine residue (Ser-9) is essential for the stability of such a complex...
October 3, 2017: Cell Reports
https://www.readbyqxmd.com/read/28904092/map1b-light-chain-modulates-synaptic-transmission-via-ampa-receptor-intracellular-trapping
#2
Rocío Palenzuela, Yolanda Gutiérrez, Jonathan E Draffin, Argentina Lario, Marion Benoist, José A Esteban
The regulated transport of AMPA-type glutamate receptors (AMPARs) to the synaptic membrane is a key mechanism to determine the strength of excitatory synaptic transmission in the brain. In this work, we uncovered a new role for the microtubule-associated protein MAP1B, in modulating the access of AMPARs to the postsynaptic membrane. Using mice and rats of either sex, we show that MAP1B light chain (LC) accumulates in the somatodendritic compartment of hippocampal neurons, where it forms immobile complexes on microtubules that limit vesicular transport...
September 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28890360/synergistic-regulation-of-coregulator-nuclear-receptor-interaction-by-ligand-and-dna
#3
Ian Mitchelle S de Vera, Jie Zheng, Scott Novick, Jinsai Shang, Travis S Hughes, Richard Brust, Paola Munoz-Tello, William J Gardner, David P Marciano, Xiangming Kong, Patrick R Griffin, Douglas J Kojetin
Nuclear receptor (NR) transcription factors bind various coreceptors, small-molecule ligands, DNA response element sequences, and transcriptional coregulator proteins to affect gene transcription. Small-molecule ligands and DNA are known to influence receptor structure, coregulator protein interaction, and function; however, little is known on the mechanism of synergy between ligand and DNA. Using quantitative biochemical, biophysical, and solution structural methods, including (13)C-detected nuclear magnetic resonance and hydrogen/deuterium exchange (HDX) mass spectrometry, we show that ligand and DNA cooperatively recruit the intrinsically disordered steroid receptor coactivator-2 (SRC-2/TIF2/GRIP1/NCoA-2) receptor interaction domain to peroxisome proliferator-activated receptor gamma-retinoid X receptor alpha (PPARγ-RXRα) heterodimer and reveal the binding determinants of the complex...
October 3, 2017: Structure
https://www.readbyqxmd.com/read/28878246/loss-of-nr2e3-represses-ahr-by-lsd1-reprogramming-is-associated-with-poor-prognosis-in-liver-cancer
#4
Tilak Khanal, Kwangmin Choi, Yuet-Kin Leung, Jiang Wang, Dasom Kim, Vinothini Janakiram, Sung-Gook Cho, Alvaro Puga, Shuk-Mei Ho, Kyounghyun Kim
The aryl hydrocarbon receptor (AHR) plays crucial roles in inflammation, metabolic disorder, and cancer. However, the molecular mechanisms regulating AHR expression remain unknown. Here, we found that an orphan nuclear NR2E3 maintains AHR expression, and forms an active transcriptional complex with transcription factor Sp1 and coactivator GRIP1 in MCF-7 human breast and HepG2 liver cancer cell lines. NR2E3 loss promotes the recruitment of LSD1, a histone demethylase of histone 3 lysine 4 di-methylation (H3K4me2), to the AHR gene promoter region, resulting in repression of AHR expression...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821652/calpain-grip-signaling-in-nucleus-accumbens-core-mediates-the-reconsolidation-of-drug-reward-memory
#5
Jie Liang, Jia-Li Li, Ying Han, Yi-Xiao Luo, Yan-Xue Xue, Yàn Zhang, Yán Zhang, Li-Bo Zhang, Man-Li Chen, Lin Lu, Jie Shi
Exposure to drug-paired cues causes drug memories to be in a destabilized state and interfering with memory reconsolidation can inhibit relapse. Calpain, a calcium-dependent neutral cysteine protease, is involved in synaptic plasticity and the formation of long-term fear memory. However, the role of calpain in the reconsolidation of drug reward memory is still unknown. In the present study, using a conditioned place preference (CPP) model, we found that exposure to drug-paired contextual stimuli induced the activation of calpain and decreased the expression of glutamate receptor interacting protein 1 (GRIP1) in the nucleus accumbens (NAc) core, but not shell, of male rats...
September 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28236240/binding-specificity-profiles-from-computational-peptide-screening
#6
Stefan Wallin
The computational peptide screening method is a Monte Carlo-based procedure to systematically characterize the specificity of a peptide-binding site. The method is based on a generalized-ensemble algorithm in which the peptide sequence has become a dynamic variable, i.e., molecular simulations with ordinary conformational moves are enhanced with a type of "mutational" move such that proper statistics are achieved for multiple sequences in a single run. The peptide screening method has two main steps. In the first, reference simulations of the unbound state are performed and used to parametrize a linear model of the unbound state free energy, determined by requiring that the marginal distribution of peptide sequences is approximately flat...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28111449/association-of-a-missense-mutation-in-the-positional-candidate-gene-glutamate-receptor-interacting-protein-1-with-backfat-thickness-traits-in-pigs
#7
Jae-Bong Lee, Hee-Bok Park, Chae-Kyoung Yoo, Hee-Sung Kim, In-Cheol Cho, Hyun-Tae Lim
OBJECTIVE: Previously, we reported quantitative trait loci (QTLs) affecting backfat thickness (BFT) traits on pig chromosome 5 (SW1482-SW963) in an F2 intercross population between Landrace and Korean native pigs. The aim of this study was to evaluate glutamate receptor-interacting protein 1 (GRIP1) as a positional candidate gene underlying the QTL affecting BFT traits. METHODS: Genotype and phenotype analyses were performed using the 1,105 F2 progeny. A mixed-effect linear model was used to access association between these single nucleotide polymorphism (SNP) markers and the BFT traits in the F2 intercross population...
August 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28063882/mice-lacking-grip1-2-show-increased-social-interactions-and-enhanced-phosphorylation-at-glua2-s880
#8
Mei Han, Rebeca Mejias, Shu-Ling Chiu, Rebecca Rose, Abby Adamczyk, Richard Huganir, Tao Wang
Glutamate receptor interacting proteins 1 and 2 (GRIP1/2) play an important role in regulating synaptic trafficking of AMPA receptor 2/3 (GluA2/3) and synaptic strength. Gain-of-function GRIP1 mutations are implicated in social behavioral deficits in autism. To study mechanisms of Grip1/2-mediated AMPA signaling in the regulation of social behaviors, we performed social behavioral testing on neuron-specific Grip1/2-double knockout (DKO) and wild type (WT) mice that are matched for age, sex, and strain background...
March 15, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28029379/characterization-of-nuclear-foci-targeting-of-luman-creb3-recruitment-factor-lrf-crebrf-and-its-potential-role-in-inhibition-of-herpes-simplex-virus-1-replication
#9
Timothy E Audas, Philip W Hardy-Smith, Jenna Penney, Tiegh Taylor, Ray Lu
The recently identified Luman/CREB3-binding partner LRF (Luman/CREB3 recruitment factor) was shown to localize to discrete sub-nuclear foci. Luman is implicated in herpes simplex virus-1 (HSV-1) latency/reactivation and the unfolded protein response (UPR) pathway; therefore, we sought to characterize the formation of the LRF nuclear foci in the context of cellular signaling and HSV-1 replication. Here, we mapped the nuclear foci-targeting sequence to the central region containing the first leucine zipper (a...
December 2016: European Journal of Cell Biology
https://www.readbyqxmd.com/read/27941904/the-role-of-grip1-and-ephrin-b3-in-blood-pressure-control-and-vascular-smooth-muscle-cell-contractility
#10
Yujia Wang, Zenghui Wu, Hongyu Luo, Junzheng Peng, John Raelson, Georg B Ehret, Patricia B Munroe, Ekatherina Stoyanova, Zhao Qin, Guy Cloutier, W Edward Bradley, Tao Wu, Jian-Zhong Shen, Shenjiang Hu, Jiangping Wu
Several erythropoietin-producing hepatocellular receptor B family (EPHB) and their ligands, ephrinBs (EFNBs), are involved in blood pressure regulation in animal models. We selected 528 single nucleotide polymorphisms (SNPs) within the genes of EPHB6, EFNB2, EFNB3 and GRIP1 in the EPH/EFN signalling system to query the International Blood Pressure Consortium dataset. A SNP within the glutamate receptor interacting protein 1 (GRIP1) gene presented a p-value of 0.000389, approaching the critical p-value of 0...
December 12, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885724/identification-of-lactoferrin-and-glutamate-receptor-interacting-protein-1-in-bovine-cervical-mucus-a-putative-marker-for-oestrous-detection
#11
W Y Lee, M H Park, K W Kim, H Song, K B Kim, C S Lee, N K Kim, J K Park, B C Yang, K B Oh, G S Im, H J Chung
Accurate detection of oestrus is important for artificial insemination. The aim of this study was to identify oestrous-specific bovine cervical mucus proteins that could be used to determine the optimal time for artificial insemination. Non-oestrous and controlled internal drug release (CIDR)-induced oestrous-stage mucus proteins were purified and subjected to surface-enhanced laser desorption/ionization time-of-flight mass spectrometry, sodium dodecyl sulphate polyacrylamide gel electrophoresis and MALDI-TOF/TOF...
February 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27631377/glutamate-receptor-interacting-protein-1-mediates-platelet-adhesion-and-thrombus-formation
#12
Kristina L Modjeski, Sara K Ture, David J Field, Scott J Cameron, Craig N Morrell
Thrombosis-associated pathologies, such as myocardial infarction and stroke, are major causes of morbidity and mortality worldwide. Because platelets are necessary for hemostasis and thrombosis, platelet directed therapies must balance inhibiting platelet function with bleeding risk. Glutamate receptor interacting protein 1 (GRIP1) is a large scaffolding protein that localizes and organizes interacting proteins in other cells, such as neurons. We have investigated the role of GRIP1 in platelet function to determine its role as a molecular scaffold in thrombus formation...
2016: PloS One
https://www.readbyqxmd.com/read/27568566/upregulation-of-%C3%AE-3a-drives-homeostatic-plasticity-by-rerouting-ampar-into-the-recycling-endosomal-pathway
#13
Celine C Steinmetz, Vedakumar Tatavarty, Ken Sugino, Yasuyuki Shima, Anne Joseph, Heather Lin, Michael Rutlin, Mary Lambo, Chris M Hempel, Benjamin W Okaty, Suzanne Paradis, Sacha B Nelson, Gina G Turrigiano
Synaptic scaling is a form of homeostatic plasticity driven by transcription-dependent changes in AMPA-type glutamate receptor (AMPAR) trafficking. To uncover the pathways involved, we performed a cell-type-specific screen for transcripts persistently altered during scaling, which identified the μ subunit (μ3A) of the adaptor protein complex AP-3A. Synaptic scaling increased μ3A (but not other AP-3 subunits) in pyramidal neurons and redistributed dendritic μ3A and AMPAR to recycling endosomes (REs). Knockdown of μ3A prevented synaptic scaling and this redistribution, while overexpression (OE) of full-length μ3A or a truncated μ3A that cannot interact with the AP-3A complex was sufficient to drive AMPAR to REs...
September 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27490364/high-resolution-genomic-scans-reveal-genetic-architecture-controlling-alcohol-preference-in-bidirectionally-selected-rat-model
#14
Chiao-Ling Lo, Amy C Lossie, Tiebing Liang, Yunlong Liu, Xiaoling Xuei, Lawrence Lumeng, Feng C Zhou, William M Muir
Investigations on the influence of nature vs. nurture on Alcoholism (Alcohol Use Disorder) in human have yet to provide a clear view on potential genomic etiologies. To address this issue, we sequenced a replicated animal model system bidirectionally-selected for alcohol preference (AP). This model is uniquely suited to map genetic effects with high reproducibility, and resolution. The origin of the rat lines (an 8-way cross) resulted in small haplotype blocks (HB) with a corresponding high level of resolution...
August 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27464507/the-transcriptional-coregulator-grip1-controls-macrophage-polarization-and-metabolic-homeostasis
#15
Maddalena Coppo, Yurii Chinenov, Maria A Sacta, Inez Rogatsky
Diet-induced obesity causes chronic macrophage-driven inflammation in white adipose tissue (WAT) leading to insulin resistance. WAT macrophages, however, differ in their origin, gene expression and activities: unlike infiltrating monocyte-derived inflammatory macrophages, WAT-resident macrophages counteract inflammation and insulin resistance, yet, the mechanisms underlying their transcriptional programming remain poorly understood. We recently reported that a nuclear receptor cofactor-glucocorticoid receptor (GR)-interacting protein (GRIP)1-cooperates with GR to repress inflammatory genes...
July 28, 2016: Nature Communications
https://www.readbyqxmd.com/read/27425598/structural-insight-into-grip1-pdz6-in-alzheimer-s-disease-study-from-protein-expression-data-to-molecular-dynamics-simulations
#16
Paulami Chatterjee, Debjani Roy
Protein-protein interaction domain, PDZ, plays a critical role in efficient synaptic transmission in brain. Dysfunction of synaptic transmission is thought to be the underlying basis of many neuropsychiatric and neurodegenerative disorders including Alzheimer's disease (AD). In this study, Glutamate Receptor Interacting Protein1 (GRIP1) was identified as one of the most important differentially expressed, topologically significant proteins in the protein-protein interaction network. To date, very few studies have analyzed the detailed structural basis of PDZ-mediated protein interaction of GRIP1...
August 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/27342949/urolithin-a-suppresses-the-proliferation-of-endometrial-cancer-cells-by-mediating-estrogen-receptor-%C3%AE-dependent-gene-expression
#17
Wei Zhang, Jo-Hsin Chen, Irene Aguilera-Barrantes, Chung-Wai Shiau, Xiugui Sheng, Li-Shu Wang, Gary D Stoner, Yi-Wen Huang
SCOPE: Obese and overweight women are at high risk of developing endometrial cancer; indeed, many of endometrial cancer patients are obese. The increased number and size of adipocytes due to obesity elevate levels of circulating estrogens that stimulate cell proliferation in the endometrium. However, black raspberries are a promising approach to preventing endometrial cancer. METHODS AND RESULTS: We examined 17 black raspberry constituents and metabolites (10 μM or 10 μg/mL, 48 h) for their ability to prevent endometrial cancer cells from proliferating...
November 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/27085678/lxr%C3%AE-represses-lps-induced-inflammatory-responses-by-competing-with-irf3-for-grip1-in-kupffer-cells
#18
Chun-Mu Miao, Kun He, Pei-Zhi Li, Zuo-Jin Liu, Xi-Wen Zhu, Zhi-Bing Ou, Xiong-Zhong Ruan, Jian-Ping Gong, Chang-An Liu
Liver X receptors (LXRs) in the nucleus play important roles in lipid metabolism and inflammation. The mechanism of LXR regulation of the LPS-induced Toll-like receptor 4 (TLR4) inflammatory signaling pathway remains to be elucidated. C57/BL6 mice were randomly divided into four groups: control, T0901317 (a LXRs agonist), LPS and T0901317+LPS. Additionally, Kupffer cells isolated from male C57/BL6 mice were divided into the same four groups. A decreased amount of inflammatory cells infiltrated the portal areas and the hepatic sinusoids in the livers of mice in the T0901317+LPS group than in those of mice in the LPS group...
June 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/26916741/skin-metabolite-farnesyl-pyrophosphate-regulates-epidermal-response-to-inflammation-oxidative-stress-and-migration
#19
Irena Pastar, Olivera Stojadinovic, Andrew P Sawaya, Rivka C Stone, Linsey E Lindley, Nkemcho Ojeh, Sasa Vukelic, Herbert H Samuels, Marjana Tomic-Canic
Skin produces cholesterol and a wide array of sterols and non-sterol mevalonate metabolites, including isoprenoid derivative farnesyl pyrophosphate (FPP). To characterize FPP action in epidermis, we generated transcriptional profiles of primary human keratinocytes treated with zaragozic acid (ZGA), a squalene synthase inhibitor that blocks conversion of FPP to squalene resulting in endogenous accumulation of FPP. The elevated levels of intracellular FPP resulted in regulation of epidermal differentiation and adherens junction signaling, insulin growth factor (IGF) signaling, oxidative stress response and interferon (IFN) signaling...
November 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/26601915/glutamate-receptor-interacting-protein-1-regulates-cd4-ctla-4-expression-and-transplant-rejection
#20
K L Modjeski, S C Levy, S K Ture, D J Field, G Shi, K Ko, Q Zhu, C N Morrell
PDZ domains are common 80- to 90-amino-acid regions named after the first three proteins discovered to share these domains: postsynaptic density 95, discs large, and zonula occludens. PDZ domain-containing proteins typically interact with the C-terminus of membrane receptors. Glutamate receptor interacting protein 1 (GRIP1), a seven-PDZ domain protein scaffold, regulates glutamate receptor surface expression and trafficking in neurons. We have found that human and mouse T cells also express GRIP1. T cell-specific GRIP1(-/-) mice >11 weeks old had prolonged cardiac allograft survival...
May 2016: American Journal of Transplantation
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