{"gene":"SLC1A2","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1998,"finding":"GLT-1/EAAT2 functions as a Na+-dependent high-affinity glutamate transporter responsible for the bulk of forebrain glutamate uptake, and biophysical studies of cloned transporters revealed that some subtypes also function as ligand-gated ion channels.","method":"Expression systems, biophysical/electrophysiological recordings, subtype-specific antibodies","journal":"Neurochemistry international","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in expression systems with electrophysiology, replicated across labs","pmids":["10098717"],"is_preprint":false},{"year":1998,"finding":"GLT-1/EAAT2 protein is expressed in neurons (hippocampal microcultures), primarily in dendrites of excitatory neurons, and neuronal GLT-1 can participate in clearance of synaptically released glutamate as shown by dihydrokainate-sensitive transport currents and prolonged autaptic currents after glial inactivation.","method":"Immunocytochemistry with N- and C-terminal antibodies, whole-cell electrophysiology, pharmacological blockade with dihydrokainate","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (immunostaining, electrophysiology, pharmacology) in single study","pmids":["9614226"],"is_preprint":false},{"year":1998,"finding":"GLT-1 (EAAT2) mRNA and protein are expressed in cultured hippocampal neurons (not restricted to glia), demonstrated by single-cell mRNA amplification and immunocytochemistry.","method":"Single-cell mRNA amplification, immunocytochemistry with subtype-specific antibodies","journal":"Neurochemistry international","confidence":"Medium","confidence_rationale":"Tier 2 — two orthogonal methods, single lab","pmids":["9761452"],"is_preprint":false},{"year":1998,"finding":"A splice variant of GLT1/EAAT2 (GLT1v) generated by alternative splicing at the 3'-end is preferentially expressed in neurons (CNS and PNS) rather than astrocytes, and immunolabeling shows a cytoplasmic/granular localization suggesting vesicle membrane association.","method":"cDNA cloning, RT-PCR, Northern blot, in situ hybridization, immunocytochemistry","journal":"Neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods confirming neuronal isoform with distinct localization","pmids":["11784699"],"is_preprint":false},{"year":1998,"finding":"Alternative splicing of human EAAT2 produces two novel transcripts (EAAT2-C1, lacking exon 8; EAAT2-C2, with internal splice sites in exons 5 and 6) resulting in deletions of 45 and 107 amino acids in the C-terminal and central protein regions, respectively.","method":"RT-PCR cloning, sequence analysis","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 — molecular cloning with sequence validation, single lab","pmids":["9502218"],"is_preprint":false},{"year":2003,"finding":"EAAT2 (GLT-1) is the predominant nerve terminal glutamate transporter in adult rodent CNS; Western blotting detected EAAT2 in synaptosomes, and pharmacological inhibition with dihydrokainate failed to unmask any non-EAAT2 uptake sites in nerve terminals.","method":"Western blotting of synaptosomes and glial plasmalemmal vesicles, [3H]D-aspartate and [3H]L-glutamate uptake assays, pharmacological inhibition","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical fractionation plus functional uptake assays with multiple inhibitors","pmids":["12558972"],"is_preprint":false},{"year":2005,"finding":"NF-κB positively regulates EAAT2 transcription (EGF-dependent activation), while TNFα mediates repression of EAAT2 through a distinct NF-κB pathway requiring recruitment of N-myc to N-myc binding sites in the EAAT2 promoter; EGF activates NF-κB independently of IκB signaling.","method":"Reporter gene assays, ChIP, promoter mutagenesis, IKKβ/p65 overexpression, N-myc overexpression","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — promoter mutagenesis + ChIP + multiple pathway analyses in one rigorous study","pmids":["15660126"],"is_preprint":false},{"year":2007,"finding":"DNA methylation of the EAAT2 promoter CpG island silences EAAT2 expression in glial cells; bisulfite analysis showed dense methylation in EAAT2-negative glioma lines vs. hypomethylation in EAAT2-positive brain tissue; in vitro methylation reduced promoter activity and altered nuclear factor binding.","method":"Bisulfite sequencing, EMSA, reporter gene assay, DNA methyltransferase inhibition","journal":"Glia","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal epigenetic methods with functional validation","pmids":["17311293"],"is_preprint":false},{"year":2007,"finding":"PKC activation causes clathrin-dependent endocytosis and subsequent lysosomal degradation of GLT-1; dominant-negative dynamin1, clathrin heavy chain, and Rab7 constructs blocked these effects, while cholesterol depletion, caveolin-1 DN, Eps15 DN, and Arf6 DN had no effect.","method":"Surface biotinylation, dominant-negative constructs (dynamin, clathrin, Rab7, caveolin, Eps15, Arf6), lysosomal inhibitors (chloroquine, ammonium chloride)","journal":"Neurochemistry international","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with multiple dominant-negative constructs and pharmacological validation","pmids":["17919781"],"is_preprint":false},{"year":2008,"finding":"PKC activation induces ubiquitination of GLT-1 at redundant lysine residues in the carboxyl terminus (specifically C7K-R region), which is required for PKC-dependent internalization and degradation; mutation of all 11 cytoplasmic lysines abolished ubiquitination.","method":"Immunoprecipitation, site-directed mutagenesis of lysine residues, ubiquitin incorporation assay in C6 glioma and primary cortical cultures","journal":"Neurochemistry international","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with co-IP identifying specific ubiquitination sites","pmids":["18805448"],"is_preprint":false},{"year":2009,"finding":"Presynaptic terminals regulate astroglial GLT-1/EAAT2 expression via kappa B-motif binding phosphoprotein (KBBP/hnRNP K), which binds the GLT-1 promoter and is required for transcriptional activation; denervation reduces KBBP expression and causes astroglial transporter dysfunction.","method":"Promoter binding assays, neuron-astrocyte co-culture, in vivo denervation models (corticospinal tract transection, ricin-induced motor neuron death), ALS mouse model","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — multiple in vivo and in vitro models with mechanistic promoter binding data","pmids":["19323997"],"is_preprint":false},{"year":2009,"finding":"PIKfyve (phosphatidylinositol-3-phosphate-5-kinase) enhances EAAT2-mediated glutamate transport current and increases EAAT2 protein abundance at the cell membrane; this effect depends on SGK1 phosphorylation of PIKfyve at S318.","method":"Xenopus oocyte expression, electrophysiology (glutamate-induced inward currents), confocal microscopy, mutagenesis (S318A PIKfyve), kinase-dead SGK1 construct","journal":"Cellular physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 1 — electrophysiology + mutagenesis + confocal in reconstituted system","pmids":["19910676"],"is_preprint":false},{"year":2010,"finding":"DNA demethylation of selective CpG sites in the GLT-1 promoter correlates with increased GLT-1 mRNA in astrocytes in response to neuronal stimulation; hypermethylation at selective CpG sites represses GLT-1 promoter activation, but this mechanism does not account for EAAT2 dysregulation in ALS.","method":"Bisulfite sequencing of FACS-isolated astrocytes from BAC GLT-1 eGFP mice, in vitro and in vivo neuronal stimulation paradigms, postmortem ALS motor cortex analysis","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — bisulfite sequencing in precisely isolated cell populations with multiple experimental conditions","pmids":["19672971"],"is_preprint":false},{"year":2011,"finding":"GLT-1 co-compartmentalizes with mitochondria and glycolytic enzymes (including hexokinase-1) in fine astrocytic processes; immunoaffinity isolation identified these interacting proteins by LC-MS/MS, and simultaneous inhibition of both glycolysis and oxidative phosphorylation (but not either alone) significantly reduces glutamate transport.","method":"GLT-1 immunoaffinity isolation from rat cortex, LC-MS/MS proteomics, double-label immunofluorescence, biolistic transfection in hippocampal slices, Monte Carlo simulation, acute metabolic inhibition assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 — proteomics + colocalization + functional metabolic inhibition studies in one rigorous study","pmids":["22171032"],"is_preprint":false},{"year":2012,"finding":"Constitutive GLT-1 internalization occurs via clathrin-dependent endocytosis into EEA1/Rab4-positive recycling endosomes (not Rab11 or Rab7 compartments); ubiquitination (at lysines 517 and 526) drives internalization, and deubiquitination by UCH-L1 promotes recycling to the plasma membrane.","method":"Clathrin inhibitors, dominant-negative Rab constructs, E1 ubiquitin enzyme inhibitor, site-directed mutagenesis (K517, K526), UCH-L1 inhibitor (LDN-57444), endosomal marker co-localization in heterologous system and primary astrocytes","journal":"Glia","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of specific ubiquitination sites combined with trafficking pathway dissection","pmids":["22593014"],"is_preprint":false},{"year":2012,"finding":"The transcription factor Pax6 is expressed in astrocytes and contributes to neuron-induced GLT-1 expression by binding to a conserved distal enhancer element ~8 kb upstream of the GLT-1 translation start site.","method":"Lentiviral Pax6 overexpression in BAC GLT-1 eGFP reporter astrocytes, shRNA knockdown, EMSA, ChIP, GLT-1 protein and uptake assays","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 — ChIP + EMSA + gain- and loss-of-function with functional readout","pmids":["26485579"],"is_preprint":false},{"year":2013,"finding":"Astroglial FMRP positively regulates mGluR5 protein translation in astrocytes (FMRP associates with mGluR5 mRNA); loss of astroglial FMRP reduces mGluR5 protein and Ca2+ responses, which in turn attenuates neuron-dependent GLT-1 expression and glutamate uptake in fmr1-/- mice.","method":"Mismatched astrocyte-neuron co-cultures, FMRP immunoprecipitation + qRT-PCR, Western blot, Ca2+ imaging, dihydrokainate-sensitive GLT-1 inhibition in cortical slices","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with cell-type-specific co-cultures and RNA-protein interaction","pmids":["23396537"],"is_preprint":false},{"year":2014,"finding":"EAAT2 undergoes constitutive sumoylation (SUMO1 conjugation) in astrocytes in vitro and in vivo; sumoylated EAAT2 localizes to intracellular compartments while non-sumoylated EAAT2 resides on the plasma membrane; promoting desumoylation increases EAAT2-mediated glutamate uptake.","method":"Immunoprecipitation for SUMO1-EAAT2, immunofluorescence, subcellular fractionation, desumoylation promotion assay with functional glutamate uptake measurement in primary astrocytes and SOD1-G93A mouse","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — co-IP + localization + functional uptake assay with in vitro and in vivo validation","pmids":["24753081"],"is_preprint":false},{"year":2014,"finding":"EAAT2 heteroexchange and net uptake have comparable rates; net uptake is sensitive to membrane potential and stimulated by external permeable anions (uncoupled anion conductance); a sodium leak is also present in EAAT2; the voltage sensitivity of exchange is caused by voltage-dependent third Na+ binding.","method":"Reconstituted liposome system with rat and mouse EAAT2 protein, electrophysiological voltage manipulation, anion substitution, computational modeling","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 — reconstituted liposome system with mechanistic voltage and ion dependence analysis","pmids":["25274824"],"is_preprint":false},{"year":2014,"finding":"Small-molecule LDN/OSU-0212320 activates EAAT2 translation through PKC activation and subsequent Y-box-binding protein 1 (YB-1) phosphorylation, which drives EAAT2 translational activation.","method":"Cell-based translational activation assays, PKC pathway inhibitors, YB-1 phosphorylation analysis, in vivo pharmacokinetics and ALS/epilepsy mouse models","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — pathway inhibitor dissection combined with in vivo efficacy studies","pmids":["24569372"],"is_preprint":false},{"year":2017,"finding":"Novel positive allosteric modulators of EAAT2 interact with residues at the interface between the trimerization domain and the substrate-binding transport domain; mutagenesis of these residues abolished activator effects; activators enhance glutamate translocation rate without affecting substrate binding, confirming an allosteric mechanism.","method":"Virtual screening, in vitro transport assay in heterologous expression system, site-directed mutagenesis at trimerization/transport domain interface, selectivity assays","journal":"ACS chemical neuroscience","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis + functional transport assay defining allosteric site","pmids":["29140675"],"is_preprint":false},{"year":2017,"finding":"Brain endothelial cells induce astrocytic GLT-1 expression through a contact-dependent, Notch-dependent mechanism; γ-secretase inhibition blocks endothelia-induced Notch intracellular domain nuclear accumulation and GLT-1 upregulation; shRNA against RBPJκ (Notch effector) reduces endothelial induction of GLT-1.","method":"Astrocyte-endothelial co-culture with transwells (contact dependence), γ-secretase inhibitor (DAPT), shRNA against RBPJκ, BAC GLT-1 eGFP reporter mice, GLT-1 protein and glutamate uptake assays","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 — contact-dependence experiment + genetic inhibition of Notch pathway + functional readout","pmids":["28771710"],"is_preprint":false},{"year":2018,"finding":"Neuronal EAAT2 in axon terminals is present throughout multiple forebrain regions (not just hippocampus); conditional neuronal deletion (synapsin1-Cre) disproportionately reduces glutamate accumulation in homogenates relative to protein loss, and increases 13C-labeling of glutamine and GABA suggesting neuronal EAAT2 partially short-circuits the glutamate-glutamine cycle.","method":"Conditional KO (synapsin1-Cre × EAAT2-flox), Western blot, glutamate accumulation in tissue homogenates, U-13C-glucose isotope tracing, Ai9 Cre-reporter","journal":"Neurochemistry international","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with isotope tracing and biochemical quantification","pmids":["29530756"],"is_preprint":false},{"year":2019,"finding":"Neuronal GLT-1 (synGLT-1 KO) is required to supply glutamate to synaptic mitochondria for TCA cycle metabolism; its loss reduces aspartate content, diminishes [U-13C]-glutamate-derived TCA labeling, decreases pyruvate recycling, increases mitochondrial ATP production efficiency, and increases mitochondrial cristae density in axon terminals.","method":"Conditional KO (synapsin1-Cre), synaptosomal uptake, electron microscopy immunocytochemistry, 13C-isotope tracing, isolated mitochondria ATP/oxygen consumption assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO + isotope tracing + mitochondrial functional assays, multiple orthogonal methods","pmids":["30926746"],"is_preprint":false},{"year":2019,"finding":"Astrocytic conditional EAAT2 deletion causes early deficits in short-term and spatial long-term memory with transcriptomic signatures overlapping human AD and aging (inflammatory/synaptic pathways); neuronal EAAT2 deletion causes late-onset spatial memory deficit with kynurenine pathway dysregulation—demonstrating cell-type-specific roles.","method":"Conditional KO mice (astrocytic vs. neuronal EAAT2 deletion), behavioral testing (Morris water maze, novel object recognition), transcriptomics","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KOs with behavioral and transcriptomic phenotyping","pmids":["31591195"],"is_preprint":false},{"year":2021,"finding":"Loss of neuronal GLT-1 in presynaptic terminals causes excitotoxic failure of synaptic transmission in CA1; NMDA receptor blockade (MK801) or glutamate scavenging prevents fEPSP failure, indicating that neuronal GLT-1 protects against NMDA receptor-mediated excitotoxicity; metabolic perturbations (reduced glutamate utilization by synaptic mitochondria) contribute to vulnerability.","method":"Conditional neuronal GLT-1 KO, field potential recordings in hippocampal slices, extracellular FRET-based glutamate sensor, MK801 pharmacology, electron microscopy for mitochondrial cristae density","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + electrophysiology + pharmacological rescue + imaging","pmids":["35035352"],"is_preprint":false},{"year":2011,"finding":"CD44-SLC1A2 gene fusion in gastric cancer (caused by paracentric chromosomal inversion) places SLC1A2 under CD44 regulatory elements, driving its overexpression; silencing CD44-SLC1A2 reduces intracellular glutamate, proliferation, invasion, and anchorage-independent growth, while overexpression promotes these pro-oncogenic traits.","method":"Genomic breakpoint analysis, RT-PCR for fusion transcript, siRNA knockdown, overexpression in gastric cell lines, proliferation/invasion/anchorage-independent growth assays, intracellular glutamate measurement","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function with multiple oncogenic readouts","pmids":["21471434"],"is_preprint":false},{"year":2006,"finding":"PPARγ is a transcriptional regulator of GLT-1/EAAT2; rosiglitazone (PPARγ agonist) increases GLT-1 mRNA and protein and [3H]glutamate uptake; six PPAR response elements (PPREs) were identified in the GLT-1 promoter; rosiglitazone increased GLT-1 promoter activity 4-fold; PPARγ antagonist blocks ischemic preconditioning-induced GLT-1 upregulation.","method":"Reporter gene assay, [3H]glutamate uptake, Western blot, RT-PCR, PPARγ antagonist/agonist pharmacology, in vitro oxygen-glucose deprivation model","journal":"Journal of cerebral blood flow and metabolism","confidence":"High","confidence_rationale":"Tier 2 — promoter analysis + pharmacological gain/loss with functional uptake readout","pmids":["17213861"],"is_preprint":false},{"year":2012,"finding":"GPR30 activation (by G1 agonist) increases GLT-1 protein and mRNA in astrocytes through MAPK and PI3K signaling, TGF-α receptor transactivation, PKA, and NF-κB (both p50 and p65 subunits bind the GLT-1 promoter); GPR30 silencing reduces GLT-1 and TGF-α expression.","method":"GPR30 siRNA knockdown, G1 agonist treatment, MAPK/PI3K inhibitors, PKA inhibitor, NF-κB inhibitor, CREB and NF-κB ChIP on GLT-1 promoter, glutamate uptake assay in rat primary astrocytes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — ChIP + siRNA + pharmacological pathway dissection with functional uptake assay","pmids":["22645130"],"is_preprint":false},{"year":2011,"finding":"Equilibrative nucleoside transporter 1 (ENT1) regulates EAAT2 expression and function in astrocytes; ENT1 antagonist or siRNA reduces EAAT2 mRNA and glutamate uptake; ENT1 overexpression upregulates EAAT2; ENT1 knockdown inhibits ethanol-induced EAAT2 upregulation.","method":"ENT1-specific antagonist, siRNA knockdown, overexpression, qRT-PCR, glutamate uptake assay in cultured astrocytes","journal":"Alcoholism, clinical and experimental research","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function with functional readout, single lab","pmids":["20374202"],"is_preprint":false},{"year":2006,"finding":"Glucocorticoid receptor activation by corticosterone inhibits microglial GLT-1 expression and glutamate uptake, likely through suppression of TNF-α release; mifepristone (glucocorticoid receptor antagonist) blocks this effect; exogenous TNF-α counteracts corticosterone's inhibitory effect on GLT-1.","method":"Primary microglial cultures, LPS stimulation, corticosterone dose-response, mifepristone antagonism, TNF-α measurement, GLT-1 expression (Western blot/immunostaining), glutamate uptake assay","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological receptor specificity validation with functional uptake readout, single lab","pmids":["16473474"],"is_preprint":false},{"year":2020,"finding":"Glial GLT-1 determines susceptibility to cortical spreading depression (CSD); conditional GLT-1 KO mice show enhanced CSD frequency and velocity, more rapid extracellular glutamate accumulation during early CSD phase (measured by enzyme-based biosensor), while EAAC1 and GLAST germline KOs show no such effect.","method":"Conditional GLT-1 KO mice, electrophysiological CSD recording, hemodynamic imaging, enzyme-based extracellular glutamate biosensor","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with real-time glutamate measurement and comparison to other transporter KOs","pmids":["32585762"],"is_preprint":false},{"year":2021,"finding":"Astrocytic REST transcription factor positively regulates EAAT2 expression by recruiting the epigenetic co-activator CBP/p300 to REST binding sites in the EAAT2 promoter; REST overexpression in astrocytes attenuates Mn-induced reduction of EAAT2 and prevents excitotoxic dopaminergic neuronal death in co-culture.","method":"REST overexpression/knockdown in astrocytes, ChIP for CBP/p300 at EAAT2 promoter, glutamate uptake assay, astrocyte-neuron co-culture dopaminergic death assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — ChIP + gain-of-function + functional uptake and neuroprotection assays","pmids":["34756885"],"is_preprint":false},{"year":2012,"finding":"The CpG island shore of the GLT-1 gene acts as a methylation-sensitive enhancer; in vitro methylation of shore CpG sites abolishes dexamethasone-stimulated transcriptional activity; the shore region shows higher methylation and repressive histone marks (H3K27me3) in cerebellum (low GLT-1) vs. cortex (high GLT-1) astrocytes.","method":"Reporter gene assay, targeted in vitro CpG methylation, ChIP for H3K27me3 and H4ac, bisulfite sequencing, HDAC inhibitor treatment in region-specific astrocytes","journal":"Glia","confidence":"High","confidence_rationale":"Tier 1 — in vitro methylation + ChIP + reporter assay demonstrating functional regulatory element","pmids":["22593010"],"is_preprint":false},{"year":2016,"finding":"The laforin/malin complex (mutated in Lafora disease) slows endocytic recycling of GLT-1; overexpression of laforin and malin causes accumulation of GLT-1 at the plasma membrane and reduces GLT-1 ubiquitination; primary astrocytes from Lafora disease mice have reduced GLT-1 at plasma membrane and reduced glutamate transport capacity.","method":"Laforin/malin overexpression in cellular models, surface GLT-1 quantification, ubiquitination assays, glutamate transport assay in primary Lafora disease mouse astrocytes","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function with ubiquitination and membrane fractionation plus disease model validation","pmids":["26976331"],"is_preprint":false},{"year":2009,"finding":"Up-regulation of GLT-1 by ceftriaxone severely impairs mGluR-dependent LTD at mossy fiber-CA3 synapses and reduces LTP at the same synapses; postembedding immunogold shows increased GLT-1a density at mossy fiber terminals near and within active zones, revealing that presynaptic GLT-1 prevents activation of presynaptic receptors needed for plasticity.","method":"Ceftriaxone treatment, field potential recordings, dihydrokainate rescue, gamma-DGG assay for synaptic glutamate transient, postembedding immunogold electron microscopy, GLT-1 KO mice as specificity controls","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — electrophysiology + pharmacological rescue + ultrastructural localization with KO controls","pmids":["19651762"],"is_preprint":false},{"year":2006,"finding":"GLAST/GLT-1 double knockout mice show multiple brain developmental defects (cortical, hippocampal, olfactory bulb disorganization), impaired neural stem cell proliferation, radial migration, neuronal differentiation, and survival of subplate neurons, demonstrating that GLAST and GLT-1 are essential for brain development through regulation of extracellular glutamate.","method":"GLAST/GLT-1 double knockout mouse, histology, immunohistochemistry, analysis of cortical development","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — genetic double KO with multiple developmental phenotype readouts","pmids":["16880397"],"is_preprint":false},{"year":2013,"finding":"Proteome analysis of pancreatic islets detected that EAAT2 levels are too low to support any proposed glutamate transport functions in islets; conditional pancreatic EAAT2 deletion did not affect survival, growth, glucose tolerance, or β-cell number, ruling out a role for EAAT2 in insulin secretion.","method":"Conditional pancreatic EAAT2 KO (RIP-Cre, IPF1-Cre), LC-MS/MS proteomics of islet proteins (>7000 proteins detected), TaqMan RT-PCR, immunoblotting, immunocytochemistry, glucose tolerance testing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO + deep proteomics + functional metabolic phenotyping","pmids":["24280215"],"is_preprint":false},{"year":2014,"finding":"Restoring GLT-1 expression (but not xCT/cystine-glutamate exchange) in nucleus accumbens is the key mechanism by which chronic N-acetylcysteine (NAC) inhibits cue-induced cocaine reinstatement; suppressing NAC-induced GLT-1 restoration with vivo-morpholino antisense augmented reinstatement via increased extracellular glutamate activating mGluR5.","method":"Rat self-administration/extinction/reinstatement model, vivo-morpholino antisense oligomers targeting GLT-1 or xCT, mGluR5 blockade, intra-accumbal microinjection","journal":"Addiction biology","confidence":"High","confidence_rationale":"Tier 2 — selective antisense knockdown with pharmacological pathway validation in in vivo model","pmids":["24612076"],"is_preprint":false},{"year":2004,"finding":"Adenoviral overexpression of GLT-1 specifically in the locus coeruleus inhibits naloxone-precipitated morphine withdrawal signs, demonstrating that GLT-1 in the locus coeruleus plays an inhibitory role in morphine physical dependence.","method":"Recombinant adenovirus-mediated GLT-1 gene transfer into bilateral locus coeruleus, morphine pellet implantation, naloxone-precipitated withdrawal scoring in rats","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — region-specific gene transfer with quantified behavioral phenotype, single lab","pmids":["14750980"],"is_preprint":false}],"current_model":"SLC1A2/EAAT2/GLT-1 is the predominant Na+-dependent, electrogenic glutamate transporter in the mammalian brain, expressed in astrocytes and at lower levels in neurons (axon terminals); it operates via coupled Na+ electrochemical gradient-driven uptake with an uncoupled anion conductance, is trafficked to and from the plasma membrane via clathrin-mediated endocytosis regulated by PKC-induced ubiquitination (at specific C-terminal lysines) and deubiquitination by UCH-L1, is sumoylated in a fraction that retains the transporter intracellularly, co-compartmentalizes with mitochondria and glycolytic enzymes in astrocytic processes to couple energy supply to transport demand, is transcriptionally regulated by NF-κB (activated by EGF; repressed by TNFα/N-myc), PPARγ, REST/CBP-p300, Pax6, Notch (from endothelia), and KBBP/hnRNP K (from neuronal signals), and is epigenetically controlled by CpG island methylation and histone modifications; neuronal EAAT2 in presynaptic terminals is required for glutamate supply to synaptic mitochondria and for protection against excitotoxicity, while astrocytic EAAT2 governs synaptic glutamate clearance, cortical spreading depression susceptibility, long-term synaptic plasticity, and brain development."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing that EAAT2/GLT-1 is a Na⁺-dependent electrogenic glutamate transporter with ligand-gated channel properties resolved the biophysical basis of forebrain glutamate clearance.","evidence":"Expression cloning and electrophysiology in heterologous systems with subtype-specific pharmacology","pmids":["10098717"],"confidence":"High","gaps":["stoichiometry of coupled ion movements not fully defined in this study","uncoupled anion conductance mechanism not resolved"]},{"year":1998,"claim":"Demonstrating neuronal expression of GLT-1 (previously considered glia-specific) and identification of a neuron-enriched splice variant overturned the assumption that EAAT2 functions exclusively in astrocytes.","evidence":"Immunocytochemistry, single-cell mRNA amplification, dihydrokainate-sensitive currents in hippocampal microcultures, cDNA cloning of GLT1v variant","pmids":["9614226","9761452","11784699"],"confidence":"High","gaps":["relative contribution of neuronal vs. astrocytic EAAT2 to total clearance not quantified","functional significance of vesicular localization of GLT1v not determined"]},{"year":2003,"claim":"Showing that EAAT2 is the predominant nerve terminal glutamate transporter, with no detectable non-EAAT2 uptake in synaptosomes, established its presynaptic monopoly.","evidence":"Synaptosomal Western blotting, [³H]-glutamate uptake with dihydrokainate inhibition","pmids":["12558972"],"confidence":"High","gaps":["role of presynaptic EAAT2 in glutamate recycling vs. metabolic supply not yet distinguished"]},{"year":2005,"claim":"Dissecting NF-κB as both an activator (EGF-dependent) and repressor (TNF-α/N-myc–dependent) of EAAT2 transcription revealed how opposing inflammatory and growth factor signals converge on the same promoter.","evidence":"Promoter mutagenesis, ChIP, IKKβ/p65 and N-myc overexpression in reporter assays","pmids":["15660126"],"confidence":"High","gaps":["cell-type specificity of EGF vs. TNF-α pathways in vivo not established","chromatin context of NF-κB binding not examined"]},{"year":2006,"claim":"Identifying PPARγ response elements in the GLT-1 promoter and showing functional PPARγ-dependent upregulation linked metabolic/ischemic signaling to transporter transcription.","evidence":"Reporter assay, PPARγ agonist/antagonist, glutamate uptake, oxygen-glucose deprivation model","pmids":["17213861"],"confidence":"High","gaps":["whether PPARγ directly binds all six PPREs in vivo not confirmed by ChIP"]},{"year":2006,"claim":"GLAST/GLT-1 double knockout mice revealed that glutamate transporter activity is essential for brain development, including cortical organization and neural stem cell proliferation.","evidence":"Double-knockout histology and immunohistochemistry of cortical, hippocampal, and olfactory bulb development","pmids":["16880397"],"confidence":"High","gaps":["individual contribution of GLT-1 vs. GLAST to each developmental phenotype not separated","extracellular glutamate levels not directly measured in embryonic brain"]},{"year":2007,"claim":"Demonstrating that CpG island methylation silences EAAT2 transcription established an epigenetic mechanism for transporter loss in glioma and potentially in neurodegeneration.","evidence":"Bisulfite sequencing of glioma vs. brain tissue, in vitro methylation reporter assay, EMSA","pmids":["17311293"],"confidence":"High","gaps":["writers/erasers responsible for methylation changes not identified","relevance to ALS later shown to be minimal (PMID:19672971)"]},{"year":2007,"claim":"Mapping the PKC-triggered endocytic route as clathrin/dynamin-dependent (not caveolae or Arf6) with lysosomal degradation via Rab7 defined the internalization pathway for EAAT2.","evidence":"Surface biotinylation with dominant-negative dynamin, clathrin, Rab7, caveolin, Eps15, Arf6 constructs; lysosomal inhibitors","pmids":["17919781"],"confidence":"High","gaps":["adaptor proteins linking ubiquitinated GLT-1 to clathrin machinery not identified"]},{"year":2008,"claim":"Identifying redundant C-terminal lysines as the PKC-dependent ubiquitination sites on GLT-1 provided the molecular link between kinase signaling and transporter internalization.","evidence":"Site-directed mutagenesis of all 11 cytoplasmic lysines, ubiquitin incorporation in C6 glioma and cortical cultures","pmids":["18805448"],"confidence":"High","gaps":["E3 ubiquitin ligase responsible not identified in this study"]},{"year":2009,"claim":"Discovery that neuronal signals maintain astrocytic GLT-1 through KBBP/hnRNP K binding the GLT-1 promoter explained why denervation and motor neuron disease reduce astroglial glutamate transport.","evidence":"Promoter binding assays, neuron-astrocyte co-cultures, in vivo denervation, ALS mouse model","pmids":["19323997"],"confidence":"High","gaps":["signal from neurons to astrocytes that induces KBBP not molecularly defined"]},{"year":2009,"claim":"Showing that upregulated GLT-1 at mossy fiber terminals impairs mGluR-dependent LTD and LTP demonstrated that presynaptic EAAT2 levels gate synaptic plasticity by controlling perisynaptic glutamate concentration.","evidence":"Ceftriaxone-induced GLT-1 upregulation, electrophysiology, dihydrokainate rescue, immunogold EM, GLT-1 KO controls","pmids":["19651762"],"confidence":"High","gaps":["whether endogenous regulation of presynaptic GLT-1 modulates plasticity under physiological conditions not tested"]},{"year":2012,"claim":"Defining constitutive GLT-1 recycling through Rab4-positive endosomes, with K517/K526 ubiquitination driving internalization and UCH-L1 deubiquitination promoting recycling, completed the bidirectional trafficking model.","evidence":"Clathrin inhibitors, Rab dominant-negatives, site-directed K517R/K526R mutagenesis, UCH-L1 inhibitor in astrocytes","pmids":["22593014"],"confidence":"High","gaps":["whether K517/K526 are the same sites modified by PKC or represent constitutive-only sites not fully resolved"]},{"year":2012,"claim":"Identification of Pax6 binding a distal enhancer ~8 kb upstream of GLT-1 and the CpG shore as a methylation-sensitive enhancer element expanded the cis-regulatory landscape controlling region-specific expression.","evidence":"ChIP, EMSA, lentiviral overexpression/shRNA knockdown; targeted in vitro methylation + H3K27me3 ChIP in cortex vs. cerebellum astrocytes","pmids":["26485579","22593010"],"confidence":"High","gaps":["combinatorial interactions among Pax6, NF-κB, PPARγ, and epigenetic marks not tested"]},{"year":2014,"claim":"Reconstituted liposome studies resolved that EAAT2 heteroexchange and net uptake have comparable rates, and that voltage-dependent third Na⁺ binding underlies voltage sensitivity, clarifying the transporter's biophysical mechanism.","evidence":"Purified EAAT2 in liposomes, voltage manipulation, anion substitution, computational modeling","pmids":["25274824"],"confidence":"High","gaps":["structural basis for voltage-dependent Na⁺ binding site not determined"]},{"year":2014,"claim":"Discovery that SUMO1 conjugation retains EAAT2 intracellularly while non-sumoylated EAAT2 resides at the plasma membrane added a second post-translational code (beyond ubiquitin) controlling surface availability.","evidence":"SUMO1-EAAT2 co-IP, subcellular fractionation, desumoylation promotion with functional uptake in primary astrocytes and SOD1-G93A mice","pmids":["24753081"],"confidence":"High","gaps":["SUMO E3 ligase and desumoylating enzyme acting on EAAT2 not identified","interplay between sumoylation and ubiquitination not examined"]},{"year":2017,"claim":"Identifying an allosteric activation site at the trimerization–transport domain interface showed that EAAT2 translocation rate can be pharmacologically enhanced without altering substrate binding.","evidence":"Virtual screening, mutagenesis of interface residues, transport assays in heterologous cells","pmids":["29140675"],"confidence":"High","gaps":["structural model at atomic resolution not available","in vivo efficacy of allosteric modulators not tested"]},{"year":2017,"claim":"Demonstrating contact-dependent Notch signaling from brain endothelia to astrocytes as a GLT-1 inducer revealed a vascular–glial axis for transporter regulation.","evidence":"Astrocyte-endothelial co-culture with transwell, γ-secretase inhibitor DAPT, RBPJκ shRNA, GLT-1 eGFP reporter","pmids":["28771710"],"confidence":"High","gaps":["specific Notch ligand on endothelia not identified","in vivo validation with endothelial-specific Notch ligand deletion not performed"]},{"year":2019,"claim":"Conditional neuronal EAAT2 deletion with isotope tracing proved that presynaptic EAAT2 supplies glutamate to synaptic mitochondria for TCA metabolism and that its loss remodels mitochondrial bioenergetics.","evidence":"Synapsin1-Cre conditional KO, U-¹³C-glucose and U-¹³C-glutamate tracing, synaptosomal uptake, mitochondrial ATP/O₂ assays, EM for cristae density","pmids":["30926746"],"confidence":"High","gaps":["whether neuronal EAAT2 metabolic role extends to inhibitory terminals not tested"]},{"year":2019,"claim":"Cell-type-specific conditional deletions separated astrocytic EAAT2 (early memory deficits, inflammatory/synaptic transcriptomic overlap with AD) from neuronal EAAT2 (late-onset spatial deficit, kynurenine pathway dysregulation), demonstrating non-redundant in vivo functions.","evidence":"Astrocytic vs. neuronal conditional KO mice, Morris water maze, novel object recognition, transcriptomics","pmids":["31591195"],"confidence":"High","gaps":["direct causal link between kynurenine pathway changes and neuronal EAAT2 loss not established"]},{"year":2020,"claim":"Conditional glial GLT-1 knockout increased cortical spreading depression frequency and velocity with accelerated extracellular glutamate accumulation, establishing GLT-1 as the critical transporter gating CSD susceptibility.","evidence":"Conditional KO, electrophysiological CSD recording, enzyme-based glutamate biosensor, comparison with EAAC1 and GLAST KOs","pmids":["32585762"],"confidence":"High","gaps":["whether GLT-1 loss affects CSD through glutamate clearance alone or also via uncoupled conductance not distinguished"]},{"year":2021,"claim":"Demonstrating that neuronal GLT-1 loss causes NMDA receptor–dependent excitotoxic synaptic failure, rescuable by MK-801 or glutamate scavenging, linked the metabolic and neuroprotective roles of presynaptic EAAT2.","evidence":"Conditional neuronal KO, hippocampal field recordings, extracellular FRET glutamate sensor, MK-801 rescue, EM","pmids":["35035352"],"confidence":"High","gaps":["relative contribution of impaired mitochondrial metabolism vs. extracellular glutamate buildup to excitotoxicity not fully separated"]},{"year":2021,"claim":"Identification of REST/CBP-p300 as a transcriptional activator of EAAT2 in astrocytes, with neuroprotective consequences against manganese-induced excitotoxicity, added an epigenetic co-activator axis to the regulatory network.","evidence":"REST overexpression/knockdown, ChIP for CBP/p300 at EAAT2 promoter, glutamate uptake, astrocyte-neuron co-culture death assay","pmids":["34756885"],"confidence":"High","gaps":["whether REST acts through the same or distinct cis-elements as NF-κB and Pax6 not mapped"]},{"year":null,"claim":"The E3 ubiquitin ligase targeting EAAT2 for internalization, the SUMO E3 ligase/desumoylase pair controlling intracellular retention, the structural basis for allosteric activation and voltage-dependent Na⁺ binding, and the molecular identity of the neuronal signal that activates KBBP in astrocytes remain unidentified.","evidence":"","pmids":[],"confidence":"Low","gaps":["E3 ligase for EAAT2 ubiquitination unknown","SUMO machinery acting on EAAT2 unidentified","high-resolution structure of EAAT2 with allosteric modulator not solved","neuronal signal upstream of KBBP/hnRNP K not molecularly defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,5,18]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,18]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,5,14,17]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[8,14]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[3,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,5,18,20]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,22,23,25,35]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,11,19,21,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,7,10,15,27,32,33]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[8,9,14]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[9,14,17]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[7,33]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[36]}],"complexes":[],"partners":["UCH-L1","KBBP","PIKFYVE","YB-1","REST","PAX6","RBPJ"],"other_free_text":[]},"mechanistic_narrative":"SLC1A2 (EAAT2/GLT-1) is the principal Na⁺-dependent high-affinity glutamate transporter in the mammalian forebrain, responsible for the bulk of synaptic glutamate clearance by astrocytes and also present in neuronal presynaptic terminals where it supplies glutamate to synaptic mitochondria for TCA cycle metabolism and protects against NMDA receptor–mediated excitotoxicity [PMID:10098717, PMID:12558972, PMID:30926746, PMID:35035352]. Transport is electrogenic with an uncoupled anion conductance and voltage-dependent Na⁺ binding, and the transporter functions as a trimer whose activity can be enhanced allosterically at the trimerization–transport domain interface [PMID:25274824, PMID:29140675]. Cell-surface abundance is regulated by PKC-induced ubiquitination at C-terminal lysines (K517, K526) triggering clathrin-dependent endocytosis and lysosomal degradation, counterbalanced by UCH-L1–mediated deubiquitination that promotes recycling through Rab4-positive endosomes, while SUMO1 conjugation retains a fraction intracellularly [PMID:17919781, PMID:18805448, PMID:22593014, PMID:24753081]. Transcription is activated by NF-κB (EGF-dependent), PPARγ, Pax6, REST/CBP-p300, Notch signaling from endothelia, and KBBP/hnRNP K from neuronal signals, repressed by TNF-α/N-myc, and epigenetically controlled by CpG island and CpG shore methylation together with histone modifications (H3K27me3), with functional consequences for cortical spreading depression susceptibility, synaptic plasticity, brain development, and addiction-related glutamate homeostasis [PMID:15660126, PMID:17213861, PMID:26485579, PMID:34756885, PMID:28771710, PMID:19323997, PMID:17311293, PMID:22593010, PMID:32585762, PMID:19651762, PMID:16880397, PMID:24612076]."},"prefetch_data":{"uniprot":{"accession":"P43004","full_name":"Excitatory amino acid transporter 2","aliases":["Glutamate/aspartate transporter II","Sodium-dependent glutamate/aspartate transporter 2","Solute carrier family 1 member 2"],"length_aa":574,"mass_kda":62.1,"function":"Sodium-dependent, high-affinity amino acid transporter that mediates the uptake of L-glutamate and also L-aspartate and D-aspartate (PubMed:14506254, PubMed:15265858, PubMed:26690923, PubMed:7521911). Functions as a symporter that transports one amino acid molecule together with two or three Na(+) ions and one proton, in parallel with the counter-transport of one K(+) ion (PubMed:14506254). Mediates Cl(-) flux that is not coupled to amino acid transport; this avoids the accumulation of negative charges due to aspartate and Na(+) symport (PubMed:14506254). Essential for the rapid removal of released glutamate from the synaptic cleft, and for terminating the postsynaptic action of glutamate (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P43004/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC1A2","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLC1A2","total_profiled":1310},"omim":[{"mim_id":"617113","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 43; DEE43","url":"https://www.omim.org/entry/617113"},{"mim_id":"617106","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 42; DEE42","url":"https://www.omim.org/entry/617106"},{"mim_id":"617105","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 41; DEE41","url":"https://www.omim.org/entry/617105"},{"mim_id":"610323","title":"METADHERIN; MTDH","url":"https://www.omim.org/entry/610323"},{"mim_id":"609941","title":"DEAFNESS, AUTOSOMAL RECESSIVE 51; DFNB51","url":"https://www.omim.org/entry/609941"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":1024.9}],"url":"https://www.proteinatlas.org/search/SLC1A2"},"hgnc":{"alias_symbol":["GLT-1","GLT1","EAAT2","HBGT"],"prev_symbol":[]},"alphafold":{"accession":"P43004","domains":[{"cath_id":"1.10.3860.10","chopping":"46-198_226-507","consensus_level":"medium","plddt":88.2834,"start":46,"end":507}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P43004","model_url":"https://alphafold.ebi.ac.uk/files/AF-P43004-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P43004-F1-predicted_aligned_error_v6.png","plddt_mean":77.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC1A2","jax_strain_url":"https://www.jax.org/strain/search?query=SLC1A2"},"sequence":{"accession":"P43004","fasta_url":"https://rest.uniprot.org/uniprotkb/P43004.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P43004/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P43004"}},"corpus_meta":[{"pmid":"30851309","id":"PMC_30851309","title":"The role of astrocytic glutamate transporters GLT-1 and GLAST in neurological disorders: Potential targets for neurotherapeutics.","date":"2019","source":"Neuropharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/30851309","citation_count":347,"is_preprint":false},{"pmid":"21792905","id":"PMC_21792905","title":"Role of excitatory amino acid transporter-2 (EAAT2) and glutamate in neurodegeneration: opportunities for developing novel therapeutics.","date":"2011","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21792905","citation_count":323,"is_preprint":false},{"pmid":"21046559","id":"PMC_21046559","title":"Molecular comparison of GLT1+ and ALDH1L1+ astrocytes in vivo in astroglial reporter mice.","date":"2011","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/21046559","citation_count":209,"is_preprint":false},{"pmid":"10098717","id":"PMC_10098717","title":"The family of sodium-dependent glutamate transporters: a focus on the GLT-1/EAAT2 subtype.","date":"1998","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/10098717","citation_count":206,"is_preprint":false},{"pmid":"15660126","id":"PMC_15660126","title":"Positive and negative regulation of EAAT2 by NF-kappaB: a role for N-myc in TNFalpha-controlled repression.","date":"2005","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/15660126","citation_count":201,"is_preprint":false},{"pmid":"19323997","id":"PMC_19323997","title":"Presynaptic regulation of astroglial excitatory neurotransmitter transporter GLT1.","date":"2009","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/19323997","citation_count":196,"is_preprint":false},{"pmid":"9572288","id":"PMC_9572288","title":"Traumatic brain injury down-regulates glial glutamate transporter (GLT-1 and GLAST) proteins in rat brain.","date":"1998","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9572288","citation_count":176,"is_preprint":false},{"pmid":"10812201","id":"PMC_10812201","title":"The high-affinity glutamate transporters GLT1, GLAST, and EAAT4 are regulated via different signalling mechanisms.","date":"2000","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/10812201","citation_count":175,"is_preprint":false},{"pmid":"17122424","id":"PMC_17122424","title":"Pharmacological Induction of Ischemic Tolerance by Glutamate Transporter-1 (EAAT2) Upregulation.","date":"2006","source":"Stroke","url":"https://pubmed.ncbi.nlm.nih.gov/17122424","citation_count":165,"is_preprint":false},{"pmid":"22171032","id":"PMC_22171032","title":"Co-compartmentalization of the astroglial glutamate transporter, GLT-1, with glycolytic enzymes and mitochondria.","date":"2011","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/22171032","citation_count":163,"is_preprint":false},{"pmid":"24612076","id":"PMC_24612076","title":"Glutamate transporter GLT-1 mediates N-acetylcysteine inhibition of cocaine reinstatement.","date":"2014","source":"Addiction biology","url":"https://pubmed.ncbi.nlm.nih.gov/24612076","citation_count":140,"is_preprint":false},{"pmid":"9237493","id":"PMC_9237493","title":"Decreased glutamate transporter (GLT-1) expression in frontal cortex of rats with acute liver failure.","date":"1997","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/9237493","citation_count":138,"is_preprint":false},{"pmid":"11784699","id":"PMC_11784699","title":"A splice variant of glutamate transporter GLT1/EAAT2 expressed in neurons: cloning and localization in rat nervous system.","date":"2002","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/11784699","citation_count":136,"is_preprint":false},{"pmid":"26022265","id":"PMC_26022265","title":"Glutamate Transporter GLT-1 as a Therapeutic Target for Substance Use Disorders.","date":"2015","source":"CNS & neurological disorders drug targets","url":"https://pubmed.ncbi.nlm.nih.gov/26022265","citation_count":122,"is_preprint":false},{"pmid":"17213861","id":"PMC_17213861","title":"Ischemic preconditioning reveals that GLT1/EAAT2 glutamate transporter is a novel PPARgamma target gene involved in neuroprotection.","date":"2007","source":"Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/17213861","citation_count":120,"is_preprint":false},{"pmid":"24569372","id":"PMC_24569372","title":"Small-molecule activator of glutamate transporter EAAT2 translation provides neuroprotection.","date":"2014","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/24569372","citation_count":120,"is_preprint":false},{"pmid":"9614226","id":"PMC_9614226","title":"Neuronal expression of the glutamate transporter GLT-1 in hippocampal microcultures.","date":"1998","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/9614226","citation_count":118,"is_preprint":false},{"pmid":"27129805","id":"PMC_27129805","title":"GLT-1: The elusive presynaptic glutamate transporter.","date":"2016","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/27129805","citation_count":116,"is_preprint":false},{"pmid":"15494981","id":"PMC_15494981","title":"Increased expression of the astrocytic glutamate transporter GLT-1 in the prefrontal cortex of schizophrenics.","date":"2005","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/15494981","citation_count":105,"is_preprint":false},{"pmid":"34571003","id":"PMC_34571003","title":"Role of glutamate excitotoxicity and glutamate transporter EAAT2 in epilepsy: Opportunities for novel therapeutics development.","date":"2021","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/34571003","citation_count":101,"is_preprint":false},{"pmid":"20423712","id":"PMC_20423712","title":"Pharmacological evaluation of glutamate transporter 1 (GLT-1) mediated neuroprotection following cerebral ischemia/reperfusion injury.","date":"2010","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/20423712","citation_count":100,"is_preprint":false},{"pmid":"9767379","id":"PMC_9767379","title":"The expression of the glial glutamate transporter protein EAAT2 in motor neuron disease: an immunohistochemical study.","date":"1998","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/9767379","citation_count":100,"is_preprint":false},{"pmid":"16880397","id":"PMC_16880397","title":"From the Cover: Indispensability of the glutamate transporters GLAST and GLT1 to brain development.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16880397","citation_count":99,"is_preprint":false},{"pmid":"22764253","id":"PMC_22764253","title":"Polymorphisms in the glial glutamate transporter SLC1A2 are associated with essential tremor.","date":"2012","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/22764253","citation_count":94,"is_preprint":false},{"pmid":"22080156","id":"PMC_22080156","title":"Riluzole elevates GLT-1 activity and levels in striatal astrocytes.","date":"2011","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/22080156","citation_count":93,"is_preprint":false},{"pmid":"12558972","id":"PMC_12558972","title":"The 'glial' glutamate transporter, EAAT2 (Glt-1) accounts for high affinity glutamate uptake into adult rodent nerve endings.","date":"2003","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12558972","citation_count":91,"is_preprint":false},{"pmid":"9585360","id":"PMC_9585360","title":"Mutations in the glutamate transporter EAAT2 gene do not cause abnormal EAAT2 transcripts in amyotrophic lateral sclerosis.","date":"1998","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/9585360","citation_count":89,"is_preprint":false},{"pmid":"11443521","id":"PMC_11443521","title":"The expression of glutamate transporter GLT-1 in the rat cerebral cortex is down-regulated by the antipsychotic drug clozapine.","date":"2001","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/11443521","citation_count":89,"is_preprint":false},{"pmid":"17684493","id":"PMC_17684493","title":"EAAT2 regulation and splicing: relevance to psychiatric and neurological disorders.","date":"2007","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/17684493","citation_count":88,"is_preprint":false},{"pmid":"27733606","id":"PMC_27733606","title":"Neural Stem Cell Transplantation Induces Stroke Recovery by Upregulating Glutamate Transporter GLT-1 in Astrocytes.","date":"2016","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/27733606","citation_count":86,"is_preprint":false},{"pmid":"19651762","id":"PMC_19651762","title":"Up-regulation of GLT-1 severely impairs LTD at mossy fibre--CA3 synapses.","date":"2009","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19651762","citation_count":83,"is_preprint":false},{"pmid":"11283952","id":"PMC_11283952","title":"Differential distribution of the glutamate transporters GLT-1 and GLAST in tanycytes of the third ventricle.","date":"2001","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/11283952","citation_count":82,"is_preprint":false},{"pmid":"23893122","id":"PMC_23893122","title":"Ceftriaxone treatment affects the levels of GLT1 and ENT1 as well as ethanol intake in alcohol-preferring rats.","date":"2013","source":"Journal of molecular neuroscience : MN","url":"https://pubmed.ncbi.nlm.nih.gov/23893122","citation_count":82,"is_preprint":false},{"pmid":"22645130","id":"PMC_22645130","title":"GPR30 regulates glutamate transporter GLT-1 expression in rat primary astrocytes.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22645130","citation_count":80,"is_preprint":false},{"pmid":"31591195","id":"PMC_31591195","title":"Divergent roles of astrocytic versus neuronal EAAT2 deficiency on cognition and overlap with aging and Alzheimer's molecular signatures.","date":"2019","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/31591195","citation_count":71,"is_preprint":false},{"pmid":"24246642","id":"PMC_24246642","title":"Enhanced GLT-1 mediated glutamate uptake and migration of primary astrocytes directed by fibronectin-coated electrospun poly-L-lactic acid fibers.","date":"2013","source":"Biomaterials","url":"https://pubmed.ncbi.nlm.nih.gov/24246642","citation_count":68,"is_preprint":false},{"pmid":"11844111","id":"PMC_11844111","title":"Arabidopsis glt1-T mutant defines a role for NADH-GOGAT in the non-photorespiratory ammonium assimilatory pathway.","date":"2002","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11844111","citation_count":68,"is_preprint":false},{"pmid":"25586634","id":"PMC_25586634","title":"Blockade of the GLT-1 Transporter in the Central Nucleus of the Amygdala Induces both Anxiety and Depressive-Like Symptoms.","date":"2015","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/25586634","citation_count":67,"is_preprint":false},{"pmid":"19672971","id":"PMC_19672971","title":"Epigenetic regulation of neuron-dependent induction of astroglial synaptic protein GLT1.","date":"2010","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/19672971","citation_count":63,"is_preprint":false},{"pmid":"23396537","id":"PMC_23396537","title":"Astroglial FMRP-dependent translational down-regulation of mGluR5 underlies glutamate transporter GLT1 dysregulation in the fragile X mouse.","date":"2013","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23396537","citation_count":62,"is_preprint":false},{"pmid":"18805448","id":"PMC_18805448","title":"Ubiquitination-mediated internalization and degradation of the astroglial glutamate transporter, GLT-1.","date":"2008","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/18805448","citation_count":57,"is_preprint":false},{"pmid":"21711518","id":"PMC_21711518","title":"Risk and protective genetic variants in suicidal behaviour: association with SLC1A2, SLC1A3, 5-HTR1B &NTRK2 polymorphisms.","date":"2011","source":"Behavioral and brain functions : BBF","url":"https://pubmed.ncbi.nlm.nih.gov/21711518","citation_count":54,"is_preprint":false},{"pmid":"30926746","id":"PMC_30926746","title":"Deletion of Neuronal GLT-1 in Mice Reveals Its Role in Synaptic Glutamate Homeostasis and Mitochondrial Function.","date":"2019","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/30926746","citation_count":54,"is_preprint":false},{"pmid":"25619881","id":"PMC_25619881","title":"Effects of ceftriaxone on GLT1 isoforms, xCT and associated signaling pathways in P rats exposed to ethanol.","date":"2015","source":"Psychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/25619881","citation_count":54,"is_preprint":false},{"pmid":"29530756","id":"PMC_29530756","title":"Axon-terminals expressing EAAT2 (GLT-1; Slc1a2) are common in the forebrain and not limited to the hippocampus.","date":"2018","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/29530756","citation_count":53,"is_preprint":false},{"pmid":"28221365","id":"PMC_28221365","title":"Glial GLT-1 blockade in infralimbic cortex as a new strategy to evoke rapid antidepressant-like effects in rats.","date":"2017","source":"Translational psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/28221365","citation_count":53,"is_preprint":false},{"pmid":"29140675","id":"PMC_29140675","title":"Identification of Novel Allosteric Modulators of Glutamate Transporter EAAT2.","date":"2017","source":"ACS chemical neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/29140675","citation_count":53,"is_preprint":false},{"pmid":"21471434","id":"PMC_21471434","title":"CD44-SLC1A2 gene fusions in gastric cancer.","date":"2011","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/21471434","citation_count":52,"is_preprint":false},{"pmid":"9502218","id":"PMC_9502218","title":"Alternative splicing of the glutamate transporter EAAT2 (GLT-1).","date":"1998","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/9502218","citation_count":50,"is_preprint":false},{"pmid":"19910676","id":"PMC_19910676","title":"Regulation of the glutamate transporter EAAT2 by PIKfyve.","date":"2009","source":"Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/19910676","citation_count":49,"is_preprint":false},{"pmid":"29755340","id":"PMC_29755340","title":"Glutamate Transporter GLT1 Expression in Alzheimer Disease and Dementia With Lewy Bodies.","date":"2018","source":"Frontiers in aging neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/29755340","citation_count":48,"is_preprint":false},{"pmid":"17919781","id":"PMC_17919781","title":"Internalization and degradation of the glutamate transporter GLT-1 in response to phorbol ester.","date":"2007","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/17919781","citation_count":48,"is_preprint":false},{"pmid":"17311293","id":"PMC_17311293","title":"DNA methylation dependent silencing of the human glutamate transporter EAAT2 gene in glial cells.","date":"2007","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/17311293","citation_count":48,"is_preprint":false},{"pmid":"9761452","id":"PMC_9761452","title":"The glutamate transporter, GLT-1, is expressed in cultured hippocampal neurons.","date":"1998","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/9761452","citation_count":47,"is_preprint":false},{"pmid":"22593014","id":"PMC_22593014","title":"Cell surface turnover of the glutamate transporter GLT-1 is mediated by ubiquitination/deubiquitination.","date":"2012","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/22593014","citation_count":46,"is_preprint":false},{"pmid":"9657994","id":"PMC_9657994","title":"Regulation of expression of GLT1, the gene encoding glutamate synthase in Saccharomyces cerevisiae.","date":"1998","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/9657994","citation_count":45,"is_preprint":false},{"pmid":"24280215","id":"PMC_24280215","title":"Proteome analysis and conditional deletion of the EAAT2 glutamate transporter provide evidence against a role of EAAT2 in pancreatic insulin secretion in mice.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24280215","citation_count":45,"is_preprint":false},{"pmid":"24753081","id":"PMC_24753081","title":"Sumoylation of the astroglial glutamate transporter EAAT2 governs its intracellular compartmentalization.","date":"2014","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/24753081","citation_count":45,"is_preprint":false},{"pmid":"24123246","id":"PMC_24123246","title":"Upregulation of GLT-1 by treatment with ceftriaxone alleviates radicular pain by reducing spinal astrocyte activation and neuronal hyperexcitability.","date":"2013","source":"Journal of neuroscience research","url":"https://pubmed.ncbi.nlm.nih.gov/24123246","citation_count":45,"is_preprint":false},{"pmid":"26459047","id":"PMC_26459047","title":"Common variants in SLC1A2 and schizophrenia: Association and cognitive function in patients with schizophrenia and healthy individuals.","date":"2015","source":"Schizophrenia research","url":"https://pubmed.ncbi.nlm.nih.gov/26459047","citation_count":44,"is_preprint":false},{"pmid":"16473474","id":"PMC_16473474","title":"Corticosterone inhibits expression of the microglial glutamate transporter GLT-1 in vitro.","date":"2006","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16473474","citation_count":43,"is_preprint":false},{"pmid":"23166293","id":"PMC_23166293","title":"Relationship between increase in astrocytic GLT-1 glutamate transport and late-LTP.","date":"2012","source":"Learning & memory (Cold Spring Harbor, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/23166293","citation_count":42,"is_preprint":false},{"pmid":"10719077","id":"PMC_10719077","title":"Modulation of glutamate transporters (GLAST, GLT-1 and EAAC1) in the rat cerebellum following portocaval anastomosis.","date":"2000","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/10719077","citation_count":42,"is_preprint":false},{"pmid":"17028421","id":"PMC_17028421","title":"Glucocorticoid regulation of GLT-1 glutamate transporter isoform expression in the rat hippocampus.","date":"2006","source":"Neuroendocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/17028421","citation_count":41,"is_preprint":false},{"pmid":"20374202","id":"PMC_20374202","title":"ENT1 regulates ethanol-sensitive EAAT2 expression and function in astrocytes.","date":"2010","source":"Alcoholism, clinical and experimental research","url":"https://pubmed.ncbi.nlm.nih.gov/20374202","citation_count":40,"is_preprint":false},{"pmid":"23586612","id":"PMC_23586612","title":"Decreased expression of GLT-1 in the R6/2 model of Huntington's disease does not worsen disease progression.","date":"2013","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/23586612","citation_count":39,"is_preprint":false},{"pmid":"25274824","id":"PMC_25274824","title":"EAAT2 (GLT-1; slc1a2) glutamate transporters reconstituted in liposomes argues against heteroexchange being substantially faster than net uptake.","date":"2014","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/25274824","citation_count":39,"is_preprint":false},{"pmid":"23968561","id":"PMC_23968561","title":"CX3CL1 protects neurons against excitotoxicity enhancing GLT-1 activity on astrocytes.","date":"2013","source":"Journal of neuroimmunology","url":"https://pubmed.ncbi.nlm.nih.gov/23968561","citation_count":39,"is_preprint":false},{"pmid":"31582286","id":"PMC_31582286","title":"In vivo knockdown of astroglial glutamate transporters GLT-1 and GLAST increases excitatory neurotransmission in mouse infralimbic cortex: Relevance for depressive-like phenotypes.","date":"2019","source":"European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/31582286","citation_count":38,"is_preprint":false},{"pmid":"21373770","id":"PMC_21373770","title":"Microglial self-defence mediated through GLT-1 and glutathione.","date":"2011","source":"Amino acids","url":"https://pubmed.ncbi.nlm.nih.gov/21373770","citation_count":37,"is_preprint":false},{"pmid":"22522966","id":"PMC_22522966","title":"Expression of EAAT2 in neurons and protoplasmic astrocytes during human cortical development.","date":"2012","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/22522966","citation_count":36,"is_preprint":false},{"pmid":"24650590","id":"PMC_24650590","title":"Ceftriaxone, a GLT-1 transporter activator, disrupts hippocampal learning in rats.","date":"2014","source":"Pharmacology, biochemistry, and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/24650590","citation_count":36,"is_preprint":false},{"pmid":"35035352","id":"PMC_35035352","title":"Neuronal Loss of the Glutamate Transporter GLT-1 Promotes Excitotoxic Injury in the Hippocampus.","date":"2021","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/35035352","citation_count":36,"is_preprint":false},{"pmid":"30676715","id":"PMC_30676715","title":"Regulatory Mechanism of miR-543-3p on GLT-1 in a Mouse Model of Parkinson's Disease.","date":"2019","source":"ACS chemical neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/30676715","citation_count":35,"is_preprint":false},{"pmid":"9326278","id":"PMC_9326278","title":"Functional expression of a GLT-1 type Na+-dependent glutamate transporter in rat pinealocytes.","date":"1997","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9326278","citation_count":34,"is_preprint":false},{"pmid":"28629384","id":"PMC_28629384","title":"Involvement of the glutamate/glutamine cycle and glutamate transporter GLT-1 in antidepressant-like effects of Xiao Yao san on chronically stressed mice.","date":"2017","source":"BMC complementary and alternative medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28629384","citation_count":34,"is_preprint":false},{"pmid":"14750980","id":"PMC_14750980","title":"Effect of gene transfer of GLT-1, a glutamate transporter, into the locus coeruleus by recombinant adenoviruses on morphine physical dependence in rats.","date":"2004","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/14750980","citation_count":34,"is_preprint":false},{"pmid":"32585762","id":"PMC_32585762","title":"Glial glutamate transporter GLT-1 determines susceptibility to spreading depression in the mouse cerebral cortex.","date":"2020","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/32585762","citation_count":33,"is_preprint":false},{"pmid":"21291865","id":"PMC_21291865","title":"Regulation of ethanol-sensitive EAAT2 expression through adenosine A1 receptor in astrocytes.","date":"2011","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/21291865","citation_count":31,"is_preprint":false},{"pmid":"26485579","id":"PMC_26485579","title":"The transcription factor Pax6 contributes to the induction of GLT-1 expression in astrocytes through an interaction with a distal enhancer element.","date":"2015","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26485579","citation_count":31,"is_preprint":false},{"pmid":"34756885","id":"PMC_34756885","title":"Astrocytic transcription factor REST upregulates glutamate transporter EAAT2, protecting dopaminergic neurons from manganese-induced excitotoxicity.","date":"2021","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34756885","citation_count":31,"is_preprint":false},{"pmid":"27660034","id":"PMC_27660034","title":"Schisantherin B ameliorates Aβ1-42-induced cognitive decline via restoration of GLT-1 in a mouse model of Alzheimer's disease.","date":"2016","source":"Physiology & behavior","url":"https://pubmed.ncbi.nlm.nih.gov/27660034","citation_count":31,"is_preprint":false},{"pmid":"26976331","id":"PMC_26976331","title":"Homeostasis of the astrocytic glutamate transporter GLT-1 is altered in mouse models of Lafora disease.","date":"2016","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/26976331","citation_count":31,"is_preprint":false},{"pmid":"31158434","id":"PMC_31158434","title":"Regulation of Synaptosomal GLT-1 and GLAST during Epileptogenesis.","date":"2019","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/31158434","citation_count":30,"is_preprint":false},{"pmid":"31611842","id":"PMC_31611842","title":"Upregulation of GLT-1 via PI3K/Akt Pathway Contributes to Neuroprotection Induced by Dexmedetomidine.","date":"2019","source":"Frontiers in neurology","url":"https://pubmed.ncbi.nlm.nih.gov/31611842","citation_count":30,"is_preprint":false},{"pmid":"15777760","id":"PMC_15777760","title":"Differential modulation of the glutamate transporters GLT1, GLAST and EAAC1 by docosahexaenoic acid.","date":"2005","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/15777760","citation_count":30,"is_preprint":false},{"pmid":"28771710","id":"PMC_28771710","title":"Brain endothelial cells induce astrocytic expression of the glutamate transporter GLT-1 by a Notch-dependent mechanism.","date":"2017","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28771710","citation_count":30,"is_preprint":false},{"pmid":"24076156","id":"PMC_24076156","title":"Effect of glutamate transporter EAAT2 gene variants and gray matter deficits on working memory in schizophrenia.","date":"2013","source":"European psychiatry : the journal of the Association of European Psychiatrists","url":"https://pubmed.ncbi.nlm.nih.gov/24076156","citation_count":29,"is_preprint":false},{"pmid":"10461890","id":"PMC_10461890","title":"Wnt signaling induces GLT-1 expression in rat C6 glioma cells.","date":"1999","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10461890","citation_count":29,"is_preprint":false},{"pmid":"25492561","id":"PMC_25492561","title":"Transplantation of glial progenitors that overexpress glutamate transporter GLT1 preserves diaphragm function following cervical SCI.","date":"2014","source":"Molecular therapy : the journal of the American Society of Gene Therapy","url":"https://pubmed.ncbi.nlm.nih.gov/25492561","citation_count":29,"is_preprint":false},{"pmid":"25589729","id":"PMC_25589729","title":"Partial Loss of the Glutamate Transporter GLT-1 Alters Brain Akt and Insulin Signaling in a Mouse Model of Alzheimer's Disease.","date":"2015","source":"Journal of Alzheimer's disease : JAD","url":"https://pubmed.ncbi.nlm.nih.gov/25589729","citation_count":28,"is_preprint":false},{"pmid":"21429971","id":"PMC_21429971","title":"GLT-1 overexpression attenuates bladder nociception and local/cross-organ sensitization of bladder nociception.","date":"2011","source":"American journal of physiology. Renal physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21429971","citation_count":26,"is_preprint":false},{"pmid":"15246112","id":"PMC_15246112","title":"Alternative splicing of glutamate transporter EAAT2 RNA in neocortex and hippocampus of temporal lobe epilepsy patients.","date":"2004","source":"Epilepsy research","url":"https://pubmed.ncbi.nlm.nih.gov/15246112","citation_count":26,"is_preprint":false},{"pmid":"21291866","id":"PMC_21291866","title":"Insulin increases glutamate transporter GLT1 in cultured astrocytes.","date":"2011","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/21291866","citation_count":25,"is_preprint":false},{"pmid":"22593010","id":"PMC_22593010","title":"The CpG island shore of the GLT-1 gene acts as a methylation-sensitive enhancer.","date":"2012","source":"Glia","url":"https://pubmed.ncbi.nlm.nih.gov/22593010","citation_count":25,"is_preprint":false},{"pmid":"33841104","id":"PMC_33841104","title":"The Effect of GLT-1 Upregulation on Extracellular Glutamate Dynamics.","date":"2021","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/33841104","citation_count":24,"is_preprint":false},{"pmid":"33507976","id":"PMC_33507976","title":"Pharmacological upregulation of GLT-1 alleviates the cognitive impairments in the animal model of temporal lobe epilepsy.","date":"2021","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/33507976","citation_count":24,"is_preprint":false},{"pmid":"32399469","id":"PMC_32399469","title":"EAAT2 as a Research Target in Bipolar Disorder and Unipolar Depression: A Systematic Review.","date":"2019","source":"Molecular neuropsychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/32399469","citation_count":23,"is_preprint":false},{"pmid":"31582965","id":"PMC_31582965","title":"Wnt1 Promotes EAAT2 Expression and Mediates the Protective Effects of Astrocytes on Dopaminergic Cells in Parkinson's Disease.","date":"2019","source":"Neural plasticity","url":"https://pubmed.ncbi.nlm.nih.gov/31582965","citation_count":23,"is_preprint":false},{"pmid":"22266730","id":"PMC_22266730","title":"Rapamycin prevents the mutant huntingtin-suppressed GLT-1 expression in cultured astrocytes.","date":"2012","source":"Acta pharmacologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/22266730","citation_count":23,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54206,"output_tokens":9609,"usd":0.153376},"stage2":{"model":"claude-opus-4-6","input_tokens":13564,"output_tokens":5103,"usd":0.293092},"total_usd":0.446468,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"GLT-1/EAAT2 functions as a Na+-dependent high-affinity glutamate transporter responsible for the bulk of forebrain glutamate uptake, and biophysical studies of cloned transporters revealed that some subtypes also function as ligand-gated ion channels.\",\n      \"method\": \"Expression systems, biophysical/electrophysiological recordings, subtype-specific antibodies\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in expression systems with electrophysiology, replicated across labs\",\n      \"pmids\": [\"10098717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"GLT-1/EAAT2 protein is expressed in neurons (hippocampal microcultures), primarily in dendrites of excitatory neurons, and neuronal GLT-1 can participate in clearance of synaptically released glutamate as shown by dihydrokainate-sensitive transport currents and prolonged autaptic currents after glial inactivation.\",\n      \"method\": \"Immunocytochemistry with N- and C-terminal antibodies, whole-cell electrophysiology, pharmacological blockade with dihydrokainate\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (immunostaining, electrophysiology, pharmacology) in single study\",\n      \"pmids\": [\"9614226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"GLT-1 (EAAT2) mRNA and protein are expressed in cultured hippocampal neurons (not restricted to glia), demonstrated by single-cell mRNA amplification and immunocytochemistry.\",\n      \"method\": \"Single-cell mRNA amplification, immunocytochemistry with subtype-specific antibodies\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal methods, single lab\",\n      \"pmids\": [\"9761452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"A splice variant of GLT1/EAAT2 (GLT1v) generated by alternative splicing at the 3'-end is preferentially expressed in neurons (CNS and PNS) rather than astrocytes, and immunolabeling shows a cytoplasmic/granular localization suggesting vesicle membrane association.\",\n      \"method\": \"cDNA cloning, RT-PCR, Northern blot, in situ hybridization, immunocytochemistry\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods confirming neuronal isoform with distinct localization\",\n      \"pmids\": [\"11784699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Alternative splicing of human EAAT2 produces two novel transcripts (EAAT2-C1, lacking exon 8; EAAT2-C2, with internal splice sites in exons 5 and 6) resulting in deletions of 45 and 107 amino acids in the C-terminal and central protein regions, respectively.\",\n      \"method\": \"RT-PCR cloning, sequence analysis\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — molecular cloning with sequence validation, single lab\",\n      \"pmids\": [\"9502218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"EAAT2 (GLT-1) is the predominant nerve terminal glutamate transporter in adult rodent CNS; Western blotting detected EAAT2 in synaptosomes, and pharmacological inhibition with dihydrokainate failed to unmask any non-EAAT2 uptake sites in nerve terminals.\",\n      \"method\": \"Western blotting of synaptosomes and glial plasmalemmal vesicles, [3H]D-aspartate and [3H]L-glutamate uptake assays, pharmacological inhibition\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical fractionation plus functional uptake assays with multiple inhibitors\",\n      \"pmids\": [\"12558972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NF-κB positively regulates EAAT2 transcription (EGF-dependent activation), while TNFα mediates repression of EAAT2 through a distinct NF-κB pathway requiring recruitment of N-myc to N-myc binding sites in the EAAT2 promoter; EGF activates NF-κB independently of IκB signaling.\",\n      \"method\": \"Reporter gene assays, ChIP, promoter mutagenesis, IKKβ/p65 overexpression, N-myc overexpression\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter mutagenesis + ChIP + multiple pathway analyses in one rigorous study\",\n      \"pmids\": [\"15660126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DNA methylation of the EAAT2 promoter CpG island silences EAAT2 expression in glial cells; bisulfite analysis showed dense methylation in EAAT2-negative glioma lines vs. hypomethylation in EAAT2-positive brain tissue; in vitro methylation reduced promoter activity and altered nuclear factor binding.\",\n      \"method\": \"Bisulfite sequencing, EMSA, reporter gene assay, DNA methyltransferase inhibition\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal epigenetic methods with functional validation\",\n      \"pmids\": [\"17311293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PKC activation causes clathrin-dependent endocytosis and subsequent lysosomal degradation of GLT-1; dominant-negative dynamin1, clathrin heavy chain, and Rab7 constructs blocked these effects, while cholesterol depletion, caveolin-1 DN, Eps15 DN, and Arf6 DN had no effect.\",\n      \"method\": \"Surface biotinylation, dominant-negative constructs (dynamin, clathrin, Rab7, caveolin, Eps15, Arf6), lysosomal inhibitors (chloroquine, ammonium chloride)\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with multiple dominant-negative constructs and pharmacological validation\",\n      \"pmids\": [\"17919781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PKC activation induces ubiquitination of GLT-1 at redundant lysine residues in the carboxyl terminus (specifically C7K-R region), which is required for PKC-dependent internalization and degradation; mutation of all 11 cytoplasmic lysines abolished ubiquitination.\",\n      \"method\": \"Immunoprecipitation, site-directed mutagenesis of lysine residues, ubiquitin incorporation assay in C6 glioma and primary cortical cultures\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with co-IP identifying specific ubiquitination sites\",\n      \"pmids\": [\"18805448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Presynaptic terminals regulate astroglial GLT-1/EAAT2 expression via kappa B-motif binding phosphoprotein (KBBP/hnRNP K), which binds the GLT-1 promoter and is required for transcriptional activation; denervation reduces KBBP expression and causes astroglial transporter dysfunction.\",\n      \"method\": \"Promoter binding assays, neuron-astrocyte co-culture, in vivo denervation models (corticospinal tract transection, ricin-induced motor neuron death), ALS mouse model\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo and in vitro models with mechanistic promoter binding data\",\n      \"pmids\": [\"19323997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PIKfyve (phosphatidylinositol-3-phosphate-5-kinase) enhances EAAT2-mediated glutamate transport current and increases EAAT2 protein abundance at the cell membrane; this effect depends on SGK1 phosphorylation of PIKfyve at S318.\",\n      \"method\": \"Xenopus oocyte expression, electrophysiology (glutamate-induced inward currents), confocal microscopy, mutagenesis (S318A PIKfyve), kinase-dead SGK1 construct\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — electrophysiology + mutagenesis + confocal in reconstituted system\",\n      \"pmids\": [\"19910676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DNA demethylation of selective CpG sites in the GLT-1 promoter correlates with increased GLT-1 mRNA in astrocytes in response to neuronal stimulation; hypermethylation at selective CpG sites represses GLT-1 promoter activation, but this mechanism does not account for EAAT2 dysregulation in ALS.\",\n      \"method\": \"Bisulfite sequencing of FACS-isolated astrocytes from BAC GLT-1 eGFP mice, in vitro and in vivo neuronal stimulation paradigms, postmortem ALS motor cortex analysis\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bisulfite sequencing in precisely isolated cell populations with multiple experimental conditions\",\n      \"pmids\": [\"19672971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GLT-1 co-compartmentalizes with mitochondria and glycolytic enzymes (including hexokinase-1) in fine astrocytic processes; immunoaffinity isolation identified these interacting proteins by LC-MS/MS, and simultaneous inhibition of both glycolysis and oxidative phosphorylation (but not either alone) significantly reduces glutamate transport.\",\n      \"method\": \"GLT-1 immunoaffinity isolation from rat cortex, LC-MS/MS proteomics, double-label immunofluorescence, biolistic transfection in hippocampal slices, Monte Carlo simulation, acute metabolic inhibition assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — proteomics + colocalization + functional metabolic inhibition studies in one rigorous study\",\n      \"pmids\": [\"22171032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Constitutive GLT-1 internalization occurs via clathrin-dependent endocytosis into EEA1/Rab4-positive recycling endosomes (not Rab11 or Rab7 compartments); ubiquitination (at lysines 517 and 526) drives internalization, and deubiquitination by UCH-L1 promotes recycling to the plasma membrane.\",\n      \"method\": \"Clathrin inhibitors, dominant-negative Rab constructs, E1 ubiquitin enzyme inhibitor, site-directed mutagenesis (K517, K526), UCH-L1 inhibitor (LDN-57444), endosomal marker co-localization in heterologous system and primary astrocytes\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of specific ubiquitination sites combined with trafficking pathway dissection\",\n      \"pmids\": [\"22593014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The transcription factor Pax6 is expressed in astrocytes and contributes to neuron-induced GLT-1 expression by binding to a conserved distal enhancer element ~8 kb upstream of the GLT-1 translation start site.\",\n      \"method\": \"Lentiviral Pax6 overexpression in BAC GLT-1 eGFP reporter astrocytes, shRNA knockdown, EMSA, ChIP, GLT-1 protein and uptake assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP + EMSA + gain- and loss-of-function with functional readout\",\n      \"pmids\": [\"26485579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Astroglial FMRP positively regulates mGluR5 protein translation in astrocytes (FMRP associates with mGluR5 mRNA); loss of astroglial FMRP reduces mGluR5 protein and Ca2+ responses, which in turn attenuates neuron-dependent GLT-1 expression and glutamate uptake in fmr1-/- mice.\",\n      \"method\": \"Mismatched astrocyte-neuron co-cultures, FMRP immunoprecipitation + qRT-PCR, Western blot, Ca2+ imaging, dihydrokainate-sensitive GLT-1 inhibition in cortical slices\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with cell-type-specific co-cultures and RNA-protein interaction\",\n      \"pmids\": [\"23396537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"EAAT2 undergoes constitutive sumoylation (SUMO1 conjugation) in astrocytes in vitro and in vivo; sumoylated EAAT2 localizes to intracellular compartments while non-sumoylated EAAT2 resides on the plasma membrane; promoting desumoylation increases EAAT2-mediated glutamate uptake.\",\n      \"method\": \"Immunoprecipitation for SUMO1-EAAT2, immunofluorescence, subcellular fractionation, desumoylation promotion assay with functional glutamate uptake measurement in primary astrocytes and SOD1-G93A mouse\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP + localization + functional uptake assay with in vitro and in vivo validation\",\n      \"pmids\": [\"24753081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"EAAT2 heteroexchange and net uptake have comparable rates; net uptake is sensitive to membrane potential and stimulated by external permeable anions (uncoupled anion conductance); a sodium leak is also present in EAAT2; the voltage sensitivity of exchange is caused by voltage-dependent third Na+ binding.\",\n      \"method\": \"Reconstituted liposome system with rat and mouse EAAT2 protein, electrophysiological voltage manipulation, anion substitution, computational modeling\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted liposome system with mechanistic voltage and ion dependence analysis\",\n      \"pmids\": [\"25274824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Small-molecule LDN/OSU-0212320 activates EAAT2 translation through PKC activation and subsequent Y-box-binding protein 1 (YB-1) phosphorylation, which drives EAAT2 translational activation.\",\n      \"method\": \"Cell-based translational activation assays, PKC pathway inhibitors, YB-1 phosphorylation analysis, in vivo pharmacokinetics and ALS/epilepsy mouse models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pathway inhibitor dissection combined with in vivo efficacy studies\",\n      \"pmids\": [\"24569372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Novel positive allosteric modulators of EAAT2 interact with residues at the interface between the trimerization domain and the substrate-binding transport domain; mutagenesis of these residues abolished activator effects; activators enhance glutamate translocation rate without affecting substrate binding, confirming an allosteric mechanism.\",\n      \"method\": \"Virtual screening, in vitro transport assay in heterologous expression system, site-directed mutagenesis at trimerization/transport domain interface, selectivity assays\",\n      \"journal\": \"ACS chemical neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis + functional transport assay defining allosteric site\",\n      \"pmids\": [\"29140675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Brain endothelial cells induce astrocytic GLT-1 expression through a contact-dependent, Notch-dependent mechanism; γ-secretase inhibition blocks endothelia-induced Notch intracellular domain nuclear accumulation and GLT-1 upregulation; shRNA against RBPJκ (Notch effector) reduces endothelial induction of GLT-1.\",\n      \"method\": \"Astrocyte-endothelial co-culture with transwells (contact dependence), γ-secretase inhibitor (DAPT), shRNA against RBPJκ, BAC GLT-1 eGFP reporter mice, GLT-1 protein and glutamate uptake assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — contact-dependence experiment + genetic inhibition of Notch pathway + functional readout\",\n      \"pmids\": [\"28771710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Neuronal EAAT2 in axon terminals is present throughout multiple forebrain regions (not just hippocampus); conditional neuronal deletion (synapsin1-Cre) disproportionately reduces glutamate accumulation in homogenates relative to protein loss, and increases 13C-labeling of glutamine and GABA suggesting neuronal EAAT2 partially short-circuits the glutamate-glutamine cycle.\",\n      \"method\": \"Conditional KO (synapsin1-Cre × EAAT2-flox), Western blot, glutamate accumulation in tissue homogenates, U-13C-glucose isotope tracing, Ai9 Cre-reporter\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with isotope tracing and biochemical quantification\",\n      \"pmids\": [\"29530756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Neuronal GLT-1 (synGLT-1 KO) is required to supply glutamate to synaptic mitochondria for TCA cycle metabolism; its loss reduces aspartate content, diminishes [U-13C]-glutamate-derived TCA labeling, decreases pyruvate recycling, increases mitochondrial ATP production efficiency, and increases mitochondrial cristae density in axon terminals.\",\n      \"method\": \"Conditional KO (synapsin1-Cre), synaptosomal uptake, electron microscopy immunocytochemistry, 13C-isotope tracing, isolated mitochondria ATP/oxygen consumption assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO + isotope tracing + mitochondrial functional assays, multiple orthogonal methods\",\n      \"pmids\": [\"30926746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Astrocytic conditional EAAT2 deletion causes early deficits in short-term and spatial long-term memory with transcriptomic signatures overlapping human AD and aging (inflammatory/synaptic pathways); neuronal EAAT2 deletion causes late-onset spatial memory deficit with kynurenine pathway dysregulation—demonstrating cell-type-specific roles.\",\n      \"method\": \"Conditional KO mice (astrocytic vs. neuronal EAAT2 deletion), behavioral testing (Morris water maze, novel object recognition), transcriptomics\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KOs with behavioral and transcriptomic phenotyping\",\n      \"pmids\": [\"31591195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of neuronal GLT-1 in presynaptic terminals causes excitotoxic failure of synaptic transmission in CA1; NMDA receptor blockade (MK801) or glutamate scavenging prevents fEPSP failure, indicating that neuronal GLT-1 protects against NMDA receptor-mediated excitotoxicity; metabolic perturbations (reduced glutamate utilization by synaptic mitochondria) contribute to vulnerability.\",\n      \"method\": \"Conditional neuronal GLT-1 KO, field potential recordings in hippocampal slices, extracellular FRET-based glutamate sensor, MK801 pharmacology, electron microscopy for mitochondrial cristae density\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + electrophysiology + pharmacological rescue + imaging\",\n      \"pmids\": [\"35035352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CD44-SLC1A2 gene fusion in gastric cancer (caused by paracentric chromosomal inversion) places SLC1A2 under CD44 regulatory elements, driving its overexpression; silencing CD44-SLC1A2 reduces intracellular glutamate, proliferation, invasion, and anchorage-independent growth, while overexpression promotes these pro-oncogenic traits.\",\n      \"method\": \"Genomic breakpoint analysis, RT-PCR for fusion transcript, siRNA knockdown, overexpression in gastric cell lines, proliferation/invasion/anchorage-independent growth assays, intracellular glutamate measurement\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function with multiple oncogenic readouts\",\n      \"pmids\": [\"21471434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PPARγ is a transcriptional regulator of GLT-1/EAAT2; rosiglitazone (PPARγ agonist) increases GLT-1 mRNA and protein and [3H]glutamate uptake; six PPAR response elements (PPREs) were identified in the GLT-1 promoter; rosiglitazone increased GLT-1 promoter activity 4-fold; PPARγ antagonist blocks ischemic preconditioning-induced GLT-1 upregulation.\",\n      \"method\": \"Reporter gene assay, [3H]glutamate uptake, Western blot, RT-PCR, PPARγ antagonist/agonist pharmacology, in vitro oxygen-glucose deprivation model\",\n      \"journal\": \"Journal of cerebral blood flow and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — promoter analysis + pharmacological gain/loss with functional uptake readout\",\n      \"pmids\": [\"17213861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GPR30 activation (by G1 agonist) increases GLT-1 protein and mRNA in astrocytes through MAPK and PI3K signaling, TGF-α receptor transactivation, PKA, and NF-κB (both p50 and p65 subunits bind the GLT-1 promoter); GPR30 silencing reduces GLT-1 and TGF-α expression.\",\n      \"method\": \"GPR30 siRNA knockdown, G1 agonist treatment, MAPK/PI3K inhibitors, PKA inhibitor, NF-κB inhibitor, CREB and NF-κB ChIP on GLT-1 promoter, glutamate uptake assay in rat primary astrocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + siRNA + pharmacological pathway dissection with functional uptake assay\",\n      \"pmids\": [\"22645130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Equilibrative nucleoside transporter 1 (ENT1) regulates EAAT2 expression and function in astrocytes; ENT1 antagonist or siRNA reduces EAAT2 mRNA and glutamate uptake; ENT1 overexpression upregulates EAAT2; ENT1 knockdown inhibits ethanol-induced EAAT2 upregulation.\",\n      \"method\": \"ENT1-specific antagonist, siRNA knockdown, overexpression, qRT-PCR, glutamate uptake assay in cultured astrocytes\",\n      \"journal\": \"Alcoholism, clinical and experimental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function with functional readout, single lab\",\n      \"pmids\": [\"20374202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Glucocorticoid receptor activation by corticosterone inhibits microglial GLT-1 expression and glutamate uptake, likely through suppression of TNF-α release; mifepristone (glucocorticoid receptor antagonist) blocks this effect; exogenous TNF-α counteracts corticosterone's inhibitory effect on GLT-1.\",\n      \"method\": \"Primary microglial cultures, LPS stimulation, corticosterone dose-response, mifepristone antagonism, TNF-α measurement, GLT-1 expression (Western blot/immunostaining), glutamate uptake assay\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological receptor specificity validation with functional uptake readout, single lab\",\n      \"pmids\": [\"16473474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Glial GLT-1 determines susceptibility to cortical spreading depression (CSD); conditional GLT-1 KO mice show enhanced CSD frequency and velocity, more rapid extracellular glutamate accumulation during early CSD phase (measured by enzyme-based biosensor), while EAAC1 and GLAST germline KOs show no such effect.\",\n      \"method\": \"Conditional GLT-1 KO mice, electrophysiological CSD recording, hemodynamic imaging, enzyme-based extracellular glutamate biosensor\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with real-time glutamate measurement and comparison to other transporter KOs\",\n      \"pmids\": [\"32585762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Astrocytic REST transcription factor positively regulates EAAT2 expression by recruiting the epigenetic co-activator CBP/p300 to REST binding sites in the EAAT2 promoter; REST overexpression in astrocytes attenuates Mn-induced reduction of EAAT2 and prevents excitotoxic dopaminergic neuronal death in co-culture.\",\n      \"method\": \"REST overexpression/knockdown in astrocytes, ChIP for CBP/p300 at EAAT2 promoter, glutamate uptake assay, astrocyte-neuron co-culture dopaminergic death assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + gain-of-function + functional uptake and neuroprotection assays\",\n      \"pmids\": [\"34756885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The CpG island shore of the GLT-1 gene acts as a methylation-sensitive enhancer; in vitro methylation of shore CpG sites abolishes dexamethasone-stimulated transcriptional activity; the shore region shows higher methylation and repressive histone marks (H3K27me3) in cerebellum (low GLT-1) vs. cortex (high GLT-1) astrocytes.\",\n      \"method\": \"Reporter gene assay, targeted in vitro CpG methylation, ChIP for H3K27me3 and H4ac, bisulfite sequencing, HDAC inhibitor treatment in region-specific astrocytes\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro methylation + ChIP + reporter assay demonstrating functional regulatory element\",\n      \"pmids\": [\"22593010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The laforin/malin complex (mutated in Lafora disease) slows endocytic recycling of GLT-1; overexpression of laforin and malin causes accumulation of GLT-1 at the plasma membrane and reduces GLT-1 ubiquitination; primary astrocytes from Lafora disease mice have reduced GLT-1 at plasma membrane and reduced glutamate transport capacity.\",\n      \"method\": \"Laforin/malin overexpression in cellular models, surface GLT-1 quantification, ubiquitination assays, glutamate transport assay in primary Lafora disease mouse astrocytes\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with ubiquitination and membrane fractionation plus disease model validation\",\n      \"pmids\": [\"26976331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Up-regulation of GLT-1 by ceftriaxone severely impairs mGluR-dependent LTD at mossy fiber-CA3 synapses and reduces LTP at the same synapses; postembedding immunogold shows increased GLT-1a density at mossy fiber terminals near and within active zones, revealing that presynaptic GLT-1 prevents activation of presynaptic receptors needed for plasticity.\",\n      \"method\": \"Ceftriaxone treatment, field potential recordings, dihydrokainate rescue, gamma-DGG assay for synaptic glutamate transient, postembedding immunogold electron microscopy, GLT-1 KO mice as specificity controls\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology + pharmacological rescue + ultrastructural localization with KO controls\",\n      \"pmids\": [\"19651762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GLAST/GLT-1 double knockout mice show multiple brain developmental defects (cortical, hippocampal, olfactory bulb disorganization), impaired neural stem cell proliferation, radial migration, neuronal differentiation, and survival of subplate neurons, demonstrating that GLAST and GLT-1 are essential for brain development through regulation of extracellular glutamate.\",\n      \"method\": \"GLAST/GLT-1 double knockout mouse, histology, immunohistochemistry, analysis of cortical development\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic double KO with multiple developmental phenotype readouts\",\n      \"pmids\": [\"16880397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Proteome analysis of pancreatic islets detected that EAAT2 levels are too low to support any proposed glutamate transport functions in islets; conditional pancreatic EAAT2 deletion did not affect survival, growth, glucose tolerance, or β-cell number, ruling out a role for EAAT2 in insulin secretion.\",\n      \"method\": \"Conditional pancreatic EAAT2 KO (RIP-Cre, IPF1-Cre), LC-MS/MS proteomics of islet proteins (>7000 proteins detected), TaqMan RT-PCR, immunoblotting, immunocytochemistry, glucose tolerance testing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO + deep proteomics + functional metabolic phenotyping\",\n      \"pmids\": [\"24280215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Restoring GLT-1 expression (but not xCT/cystine-glutamate exchange) in nucleus accumbens is the key mechanism by which chronic N-acetylcysteine (NAC) inhibits cue-induced cocaine reinstatement; suppressing NAC-induced GLT-1 restoration with vivo-morpholino antisense augmented reinstatement via increased extracellular glutamate activating mGluR5.\",\n      \"method\": \"Rat self-administration/extinction/reinstatement model, vivo-morpholino antisense oligomers targeting GLT-1 or xCT, mGluR5 blockade, intra-accumbal microinjection\",\n      \"journal\": \"Addiction biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — selective antisense knockdown with pharmacological pathway validation in in vivo model\",\n      \"pmids\": [\"24612076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Adenoviral overexpression of GLT-1 specifically in the locus coeruleus inhibits naloxone-precipitated morphine withdrawal signs, demonstrating that GLT-1 in the locus coeruleus plays an inhibitory role in morphine physical dependence.\",\n      \"method\": \"Recombinant adenovirus-mediated GLT-1 gene transfer into bilateral locus coeruleus, morphine pellet implantation, naloxone-precipitated withdrawal scoring in rats\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — region-specific gene transfer with quantified behavioral phenotype, single lab\",\n      \"pmids\": [\"14750980\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC1A2/EAAT2/GLT-1 is the predominant Na+-dependent, electrogenic glutamate transporter in the mammalian brain, expressed in astrocytes and at lower levels in neurons (axon terminals); it operates via coupled Na+ electrochemical gradient-driven uptake with an uncoupled anion conductance, is trafficked to and from the plasma membrane via clathrin-mediated endocytosis regulated by PKC-induced ubiquitination (at specific C-terminal lysines) and deubiquitination by UCH-L1, is sumoylated in a fraction that retains the transporter intracellularly, co-compartmentalizes with mitochondria and glycolytic enzymes in astrocytic processes to couple energy supply to transport demand, is transcriptionally regulated by NF-κB (activated by EGF; repressed by TNFα/N-myc), PPARγ, REST/CBP-p300, Pax6, Notch (from endothelia), and KBBP/hnRNP K (from neuronal signals), and is epigenetically controlled by CpG island methylation and histone modifications; neuronal EAAT2 in presynaptic terminals is required for glutamate supply to synaptic mitochondria and for protection against excitotoxicity, while astrocytic EAAT2 governs synaptic glutamate clearance, cortical spreading depression susceptibility, long-term synaptic plasticity, and brain development.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLC1A2 (EAAT2/GLT-1) is the principal Na⁺-dependent high-affinity glutamate transporter in the mammalian forebrain, responsible for the bulk of synaptic glutamate clearance by astrocytes and also present in neuronal presynaptic terminals where it supplies glutamate to synaptic mitochondria for TCA cycle metabolism and protects against NMDA receptor–mediated excitotoxicity [PMID:10098717, PMID:12558972, PMID:30926746, PMID:35035352]. Transport is electrogenic with an uncoupled anion conductance and voltage-dependent Na⁺ binding, and the transporter functions as a trimer whose activity can be enhanced allosterically at the trimerization–transport domain interface [PMID:25274824, PMID:29140675]. Cell-surface abundance is regulated by PKC-induced ubiquitination at C-terminal lysines (K517, K526) triggering clathrin-dependent endocytosis and lysosomal degradation, counterbalanced by UCH-L1–mediated deubiquitination that promotes recycling through Rab4-positive endosomes, while SUMO1 conjugation retains a fraction intracellularly [PMID:17919781, PMID:18805448, PMID:22593014, PMID:24753081]. Transcription is activated by NF-κB (EGF-dependent), PPARγ, Pax6, REST/CBP-p300, Notch signaling from endothelia, and KBBP/hnRNP K from neuronal signals, repressed by TNF-α/N-myc, and epigenetically controlled by CpG island and CpG shore methylation together with histone modifications (H3K27me3), with functional consequences for cortical spreading depression susceptibility, synaptic plasticity, brain development, and addiction-related glutamate homeostasis [PMID:15660126, PMID:17213861, PMID:26485579, PMID:34756885, PMID:28771710, PMID:19323997, PMID:17311293, PMID:22593010, PMID:32585762, PMID:19651762, PMID:16880397, PMID:24612076].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that EAAT2/GLT-1 is a Na⁺-dependent electrogenic glutamate transporter with ligand-gated channel properties resolved the biophysical basis of forebrain glutamate clearance.\",\n      \"evidence\": \"Expression cloning and electrophysiology in heterologous systems with subtype-specific pharmacology\",\n      \"pmids\": [\"10098717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"stoichiometry of coupled ion movements not fully defined in this study\", \"uncoupled anion conductance mechanism not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating neuronal expression of GLT-1 (previously considered glia-specific) and identification of a neuron-enriched splice variant overturned the assumption that EAAT2 functions exclusively in astrocytes.\",\n      \"evidence\": \"Immunocytochemistry, single-cell mRNA amplification, dihydrokainate-sensitive currents in hippocampal microcultures, cDNA cloning of GLT1v variant\",\n      \"pmids\": [\"9614226\", \"9761452\", \"11784699\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"relative contribution of neuronal vs. astrocytic EAAT2 to total clearance not quantified\", \"functional significance of vesicular localization of GLT1v not determined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showing that EAAT2 is the predominant nerve terminal glutamate transporter, with no detectable non-EAAT2 uptake in synaptosomes, established its presynaptic monopoly.\",\n      \"evidence\": \"Synaptosomal Western blotting, [³H]-glutamate uptake with dihydrokainate inhibition\",\n      \"pmids\": [\"12558972\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"role of presynaptic EAAT2 in glutamate recycling vs. metabolic supply not yet distinguished\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Dissecting NF-κB as both an activator (EGF-dependent) and repressor (TNF-α/N-myc–dependent) of EAAT2 transcription revealed how opposing inflammatory and growth factor signals converge on the same promoter.\",\n      \"evidence\": \"Promoter mutagenesis, ChIP, IKKβ/p65 and N-myc overexpression in reporter assays\",\n      \"pmids\": [\"15660126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"cell-type specificity of EGF vs. TNF-α pathways in vivo not established\", \"chromatin context of NF-κB binding not examined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying PPARγ response elements in the GLT-1 promoter and showing functional PPARγ-dependent upregulation linked metabolic/ischemic signaling to transporter transcription.\",\n      \"evidence\": \"Reporter assay, PPARγ agonist/antagonist, glutamate uptake, oxygen-glucose deprivation model\",\n      \"pmids\": [\"17213861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether PPARγ directly binds all six PPREs in vivo not confirmed by ChIP\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"GLAST/GLT-1 double knockout mice revealed that glutamate transporter activity is essential for brain development, including cortical organization and neural stem cell proliferation.\",\n      \"evidence\": \"Double-knockout histology and immunohistochemistry of cortical, hippocampal, and olfactory bulb development\",\n      \"pmids\": [\"16880397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"individual contribution of GLT-1 vs. GLAST to each developmental phenotype not separated\", \"extracellular glutamate levels not directly measured in embryonic brain\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that CpG island methylation silences EAAT2 transcription established an epigenetic mechanism for transporter loss in glioma and potentially in neurodegeneration.\",\n      \"evidence\": \"Bisulfite sequencing of glioma vs. brain tissue, in vitro methylation reporter assay, EMSA\",\n      \"pmids\": [\"17311293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"writers/erasers responsible for methylation changes not identified\", \"relevance to ALS later shown to be minimal (PMID:19672971)\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping the PKC-triggered endocytic route as clathrin/dynamin-dependent (not caveolae or Arf6) with lysosomal degradation via Rab7 defined the internalization pathway for EAAT2.\",\n      \"evidence\": \"Surface biotinylation with dominant-negative dynamin, clathrin, Rab7, caveolin, Eps15, Arf6 constructs; lysosomal inhibitors\",\n      \"pmids\": [\"17919781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"adaptor proteins linking ubiquitinated GLT-1 to clathrin machinery not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying redundant C-terminal lysines as the PKC-dependent ubiquitination sites on GLT-1 provided the molecular link between kinase signaling and transporter internalization.\",\n      \"evidence\": \"Site-directed mutagenesis of all 11 cytoplasmic lysines, ubiquitin incorporation in C6 glioma and cortical cultures\",\n      \"pmids\": [\"18805448\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ubiquitin ligase responsible not identified in this study\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that neuronal signals maintain astrocytic GLT-1 through KBBP/hnRNP K binding the GLT-1 promoter explained why denervation and motor neuron disease reduce astroglial glutamate transport.\",\n      \"evidence\": \"Promoter binding assays, neuron-astrocyte co-cultures, in vivo denervation, ALS mouse model\",\n      \"pmids\": [\"19323997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"signal from neurons to astrocytes that induces KBBP not molecularly defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing that upregulated GLT-1 at mossy fiber terminals impairs mGluR-dependent LTD and LTP demonstrated that presynaptic EAAT2 levels gate synaptic plasticity by controlling perisynaptic glutamate concentration.\",\n      \"evidence\": \"Ceftriaxone-induced GLT-1 upregulation, electrophysiology, dihydrokainate rescue, immunogold EM, GLT-1 KO controls\",\n      \"pmids\": [\"19651762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether endogenous regulation of presynaptic GLT-1 modulates plasticity under physiological conditions not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defining constitutive GLT-1 recycling through Rab4-positive endosomes, with K517/K526 ubiquitination driving internalization and UCH-L1 deubiquitination promoting recycling, completed the bidirectional trafficking model.\",\n      \"evidence\": \"Clathrin inhibitors, Rab dominant-negatives, site-directed K517R/K526R mutagenesis, UCH-L1 inhibitor in astrocytes\",\n      \"pmids\": [\"22593014\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether K517/K526 are the same sites modified by PKC or represent constitutive-only sites not fully resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of Pax6 binding a distal enhancer ~8 kb upstream of GLT-1 and the CpG shore as a methylation-sensitive enhancer element expanded the cis-regulatory landscape controlling region-specific expression.\",\n      \"evidence\": \"ChIP, EMSA, lentiviral overexpression/shRNA knockdown; targeted in vitro methylation + H3K27me3 ChIP in cortex vs. cerebellum astrocytes\",\n      \"pmids\": [\"26485579\", \"22593010\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"combinatorial interactions among Pax6, NF-κB, PPARγ, and epigenetic marks not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Reconstituted liposome studies resolved that EAAT2 heteroexchange and net uptake have comparable rates, and that voltage-dependent third Na⁺ binding underlies voltage sensitivity, clarifying the transporter's biophysical mechanism.\",\n      \"evidence\": \"Purified EAAT2 in liposomes, voltage manipulation, anion substitution, computational modeling\",\n      \"pmids\": [\"25274824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"structural basis for voltage-dependent Na⁺ binding site not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that SUMO1 conjugation retains EAAT2 intracellularly while non-sumoylated EAAT2 resides at the plasma membrane added a second post-translational code (beyond ubiquitin) controlling surface availability.\",\n      \"evidence\": \"SUMO1-EAAT2 co-IP, subcellular fractionation, desumoylation promotion with functional uptake in primary astrocytes and SOD1-G93A mice\",\n      \"pmids\": [\"24753081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase and desumoylating enzyme acting on EAAT2 not identified\", \"interplay between sumoylation and ubiquitination not examined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying an allosteric activation site at the trimerization–transport domain interface showed that EAAT2 translocation rate can be pharmacologically enhanced without altering substrate binding.\",\n      \"evidence\": \"Virtual screening, mutagenesis of interface residues, transport assays in heterologous cells\",\n      \"pmids\": [\"29140675\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"structural model at atomic resolution not available\", \"in vivo efficacy of allosteric modulators not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating contact-dependent Notch signaling from brain endothelia to astrocytes as a GLT-1 inducer revealed a vascular–glial axis for transporter regulation.\",\n      \"evidence\": \"Astrocyte-endothelial co-culture with transwell, γ-secretase inhibitor DAPT, RBPJκ shRNA, GLT-1 eGFP reporter\",\n      \"pmids\": [\"28771710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"specific Notch ligand on endothelia not identified\", \"in vivo validation with endothelial-specific Notch ligand deletion not performed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Conditional neuronal EAAT2 deletion with isotope tracing proved that presynaptic EAAT2 supplies glutamate to synaptic mitochondria for TCA metabolism and that its loss remodels mitochondrial bioenergetics.\",\n      \"evidence\": \"Synapsin1-Cre conditional KO, U-¹³C-glucose and U-¹³C-glutamate tracing, synaptosomal uptake, mitochondrial ATP/O₂ assays, EM for cristae density\",\n      \"pmids\": [\"30926746\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether neuronal EAAT2 metabolic role extends to inhibitory terminals not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Cell-type-specific conditional deletions separated astrocytic EAAT2 (early memory deficits, inflammatory/synaptic transcriptomic overlap with AD) from neuronal EAAT2 (late-onset spatial deficit, kynurenine pathway dysregulation), demonstrating non-redundant in vivo functions.\",\n      \"evidence\": \"Astrocytic vs. neuronal conditional KO mice, Morris water maze, novel object recognition, transcriptomics\",\n      \"pmids\": [\"31591195\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"direct causal link between kynurenine pathway changes and neuronal EAAT2 loss not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional glial GLT-1 knockout increased cortical spreading depression frequency and velocity with accelerated extracellular glutamate accumulation, establishing GLT-1 as the critical transporter gating CSD susceptibility.\",\n      \"evidence\": \"Conditional KO, electrophysiological CSD recording, enzyme-based glutamate biosensor, comparison with EAAC1 and GLAST KOs\",\n      \"pmids\": [\"32585762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether GLT-1 loss affects CSD through glutamate clearance alone or also via uncoupled conductance not distinguished\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that neuronal GLT-1 loss causes NMDA receptor–dependent excitotoxic synaptic failure, rescuable by MK-801 or glutamate scavenging, linked the metabolic and neuroprotective roles of presynaptic EAAT2.\",\n      \"evidence\": \"Conditional neuronal KO, hippocampal field recordings, extracellular FRET glutamate sensor, MK-801 rescue, EM\",\n      \"pmids\": [\"35035352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"relative contribution of impaired mitochondrial metabolism vs. extracellular glutamate buildup to excitotoxicity not fully separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of REST/CBP-p300 as a transcriptional activator of EAAT2 in astrocytes, with neuroprotective consequences against manganese-induced excitotoxicity, added an epigenetic co-activator axis to the regulatory network.\",\n      \"evidence\": \"REST overexpression/knockdown, ChIP for CBP/p300 at EAAT2 promoter, glutamate uptake, astrocyte-neuron co-culture death assay\",\n      \"pmids\": [\"34756885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether REST acts through the same or distinct cis-elements as NF-κB and Pax6 not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The E3 ubiquitin ligase targeting EAAT2 for internalization, the SUMO E3 ligase/desumoylase pair controlling intracellular retention, the structural basis for allosteric activation and voltage-dependent Na⁺ binding, and the molecular identity of the neuronal signal that activates KBBP in astrocytes remain unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"E3 ligase for EAAT2 ubiquitination unknown\", \"SUMO machinery acting on EAAT2 unidentified\", \"high-resolution structure of EAAT2 with allosteric modulator not solved\", \"neuronal signal upstream of KBBP/hnRNP K not molecularly defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 5, 18]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 5, 14, 17]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [8, 14]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [3, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 5, 18, 20]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 22, 23, 25, 35]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 11, 19, 21, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 7, 10, 15, 27, 32, 33]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [8, 9, 14]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [9, 14, 17]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [7, 33]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"UCH-L1\",\n      \"KBBP\",\n      \"PIKfyve\",\n      \"YB-1\",\n      \"REST\",\n      \"PAX6\",\n      \"RBPJ\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}