{"gene":"NR4A2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2009,"finding":"Nurr1 inhibits pro-inflammatory gene expression in microglia and astrocytes by docking to NF-κB-p65 on target inflammatory gene promoters in a signal-dependent manner, then recruiting the CoREST corepressor complex, which results in clearance of NF-κB-p65 and transcriptional repression.","method":"Chromatin immunoprecipitation, co-immunoprecipitation, reporter assays, loss-of-function (siRNA/knockout) with defined inflammatory phenotype readout","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal ChIP, co-IP for complex assembly, functional KD with specific cytokine/neurotoxicity readout, replicated across microglia and astrocytes","pmids":["19345186"],"is_preprint":false},{"year":2020,"finding":"Prostaglandin E1 (PGE1) and its metabolite PGA1 directly bind the ligand-binding domain (LBD) of Nurr1; PGA1 forms a covalent Michael adduct with Cys566 and induces a 21° conformational shift of the activation function-2 helix (H12), stimulating Nurr1 transcriptional activity.","method":"X-ray crystallography (2.05 Å structure of Nurr1-LBD/PGA1), biophysical binding assays, site-directed mutagenesis, cellular transcription assays, in vivo MPTP mouse model","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mutagenesis, in vitro binding assays, and in vivo validation in one study","pmids":["32451509"],"is_preprint":false},{"year":2019,"finding":"The dopamine metabolite 5,6-dihydroxyindole (DHI) binds directly to the Nurr1 LBD within a non-canonical pocket, forming a covalent adduct with Cys566, and stimulates Nurr1 transcriptional activity including target genes governing dopamine homeostasis.","method":"X-ray crystallography, biophysical binding assays, cellular transcription assays, zebrafish functional model","journal":"Cell chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus functional validation in cells and in vivo zebrafish model in one study","pmids":["30853418"],"is_preprint":false},{"year":2023,"finding":"RXRα ligands activate Nurr1-RXRα transcription by weakening Nurr1-RXRα LBD heterodimer affinity and promoting heterodimer dissociation (PPI inhibition), releasing a transcriptionally active Nurr1 monomer from a repressive heterodimeric complex — a mechanism distinct from classical agonism.","method":"NMR spectroscopy structural footprinting, protein-protein interaction assays, cellular transcription assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural data plus PPI assays plus functional transcription assays, single lab but multiple orthogonal methods","pmids":["37102494"],"is_preprint":false},{"year":2019,"finding":"X-ray crystal structures of the NR4A2 DNA-binding domain bound to inverted and everted Nur-responsive elements reveal that two NR4A2-DBD molecules bind independently to the everted repeat but form a novel dimer interface on the inverted repeat; substitution of interface residue Val298 to Lys abolishes dimerization.","method":"X-ray crystallography (2.6–2.8 Å), site-directed mutagenesis, EMSA/biochemical binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures with mutagenesis validation, single lab, multiple orthogonal methods","pmids":["31723028"],"is_preprint":false},{"year":2003,"finding":"Nurr1 directly regulates dopamine synthesis and storage in MN9D dopamine cells by increasing expression of AADC and VMAT2; VMAT2 upregulation requires continuous Nurr1 expression, and both AADC and VMAT2 are deregulated in Nurr1 knockout embryo midbrain.","method":"Inducible Nurr1 cell line, retroviral overexpression, in situ hybridization in knockout embryos, dopamine content assay","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function inducible system, loss-of-function knockout, multiple target genes confirmed in vivo and in vitro","pmids":["12915123"],"is_preprint":false},{"year":2011,"finding":"Nr4a2 directly binds regulatory regions of the Foxp3 gene locus, mediates permissive histone modifications, and is required for induction and maintenance of Foxp3-expressing regulatory T cells; Nr4a2 deletion attenuates Treg induction and causes aberrant Th1 responses.","method":"ChIP at Foxp3 locus, ectopic expression, conditional knockout in T cells, in vitro and in vivo Treg suppression assays, colitis model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct binding, conditional KO with specific immune phenotype, multiple in vitro and in vivo assays","pmids":["21468021"],"is_preprint":false},{"year":2021,"finding":"α-Synuclein activates GSK-3, which phosphorylates NURR1 at a domain comprising amino acids 123-PSSPPTPSTPS-134, leading to ubiquitination and proteasomal degradation of NURR1 and loss of dopaminergic markers.","method":"Sequential deletion mutants and single-point mutants of NURR1, GSK-3 activity assays, proteasome inhibitor rescue, immunoprecipitation of ubiquitinated NURR1","journal":"Molecular neurobiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis mapping of phosphorylation domain, biochemical ubiquitination and proteasome assays, multiple orthogonal methods in one study","pmids":["34609698"],"is_preprint":false},{"year":2005,"finding":"Multiple Nurr1 splice variants (nurr1a, nurr1b, nurr1c, TINUR, nurr2, nurr2c) are produced in rat and human dopamine neurons via alternative splicing in exons 3 and 7; these variants have significantly reduced transcriptional activity compared with full-length Nurr1, and nurr2/nurr2c act as dominant negatives.","method":"RT-PCR identification of splice variants, transfection reporter assays in dopaminergic SK-N-AS cells, dominant-negative functional assays","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple variant identification by RT-PCR, functional transactivation assays, single lab","pmids":["16313515"],"is_preprint":false},{"year":2004,"finding":"Nurr1 directly transactivates the osteocalcin (Ocn) gene in osteoblasts by binding as a monomer to an NBRE-like element in the proximal Ocn promoter; chromatin immunoprecipitation confirmed endogenous Nurr1 occupancy at this site, and mutation of the NBRE-like site markedly blunted transcriptional response.","method":"EMSA, chromatin immunoprecipitation, promoter-luciferase reporter assays, adenoviral Nurr1 overexpression in primary osteoblasts","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP of endogenous protein at promoter, EMSA, reporter mutagenesis, and primary cell functional assay in one study","pmids":["15485875"],"is_preprint":false},{"year":2009,"finding":"Nr4a2 is expressed downstream of Brn3a in habenular neurons and mediates expression of a subset of Brn3a-regulated transcripts, establishing Nr4a2 as a component of a gene regulatory pathway for habenula development.","method":"Microarray in Brn3a null embryos, in situ hybridization, genetic epistasis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis by microarray in null embryos, in situ hybridization confirmation, single lab","pmids":["19906978"],"is_preprint":false},{"year":2009,"finding":"Nr4a2 is required for specification of a GABAergic amacrine cell subtype in the retina; targeted inactivation results in loss of dopaminergic and p57Kip2+ amacrine cells with a concomitant increase in calbindin+ ACs, and misexpressed Nr4a2 promotes GABAergic AC differentiation while its dominant-negative form suppresses it.","method":"Conditional knockout, retroviral misexpression, dominant-negative overexpression, immunofluorescence phenotyping","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — complementary gain- and loss-of-function with defined cellular phenotypes, necessity and sufficiency established","pmids":["19692620"],"is_preprint":false},{"year":2005,"finding":"PGE2 rapidly induces NR4A2 expression in colorectal carcinoma cells via a cAMP/PKA-dependent mechanism; NR4A2 binds cognate NBRE response elements and enhances transcription, and PGE2-mediated protection from apoptosis is completely blocked by a dominant-negative NR4A2 construct.","method":"Reporter assays with NBRE construct, dominant-negative NR4A2, PKA pathway inhibitors, apoptosis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative functional rescue, reporter assays, pathway inhibitors, single lab","pmids":["16293616"],"is_preprint":false},{"year":2011,"finding":"PGE2-induced NR4A2 increases fatty acid oxidation in colon cancer cells by directly binding Nur77-binding response elements (NBREs) in the promoters of fatty acid oxidation genes and recruiting transcriptional coactivators.","method":"ChIP demonstrating NR4A2 binding to NBRE elements in FAO gene promoters, coactivator recruitment assays, fatty acid oxidation measurements, gene expression analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at endogenous gene promoters, coactivator recruitment, functional FAO assay, single lab","pmids":["21757690"],"is_preprint":false},{"year":2013,"finding":"NR4A2 is required for full Th17 differentiation by controlling autocrine IL-21 signaling; siRNA knockdown of NR4A2 prevents IL-17 and IL-21 production despite normal RORγt expression, and exogenous IL-21 restores Th17 differentiation in NR4A2-deficient cells.","method":"siRNA knockdown, in vitro Th17 differentiation assays, cytokine rescue with exogenous IL-21, in vivo siRNA treatment in EAE model","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — KD with specific cytokine phenotype, epistasis rescue by IL-21, replicated in vitro and in vivo","pmids":["23437182"],"is_preprint":false},{"year":2009,"finding":"Nurr1 interacts directly with p53 and represses p53 transcriptional activity in an interaction-dependent and dose-dependent manner, decreasing Bax expression and protecting cells from doxorubicin-induced apoptosis.","method":"Co-immunoprecipitation of Nurr1-p53 complex, reporter assays for p53 transcriptional activity, siRNA knockdown of Nurr1, apoptosis assays","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP, reporter assays, KD with functional readout, single lab","pmids":["19671681"],"is_preprint":false},{"year":2015,"finding":"Nurr1 and Foxa2 physically interact and synergistically protect midbrain dopamine neurons; AAV-mediated co-delivery of both factors in a PD mouse model markedly protects neurons and motor behaviors through both cell-autonomous actions in DA neurons and paracrine actions in neighboring glia.","method":"Co-immunoprecipitation of Nurr1-Foxa2 interaction, AAV gene delivery in PD mouse model, behavioral and histological assessment","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction, in vivo gain-of-function with specific neuronal/behavioral phenotype, single lab","pmids":["25759364"],"is_preprint":false},{"year":2015,"finding":"Nr4a2 promotes alternative (M2) macrophage polarization; exogenous Nr4a2 expression transcriptionally activates arginase 1 by directly binding its promoter, and Nr4a2-expressing macrophages confer protection in endotoxin-induced sepsis.","method":"Chromatin immunoprecipitation/reporter assay for arginase 1 promoter, overexpression and knockdown in macrophages, adoptive transfer sepsis model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP/reporter assay at target promoter, adoptive transfer functional assay, single lab","pmids":["25953901"],"is_preprint":false},{"year":2008,"finding":"Nurr1 transcriptionally regulates alpha-synuclein expression; decreased Nurr1 expression (as seen in PD patients with Nurr1 mutations) increases alpha-synuclein transcription.","method":"Nurr1 overexpression/knockdown with measurement of alpha-synuclein mRNA and reporter assays","journal":"Neuroreport","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain- and loss-of-function with transcriptional readout, single lab, limited mechanistic detail in abstract","pmids":["18463503"],"is_preprint":false},{"year":2020,"finding":"α-Synuclein (WT or A53T) reduces Nurr1 transcription by downregulating NF-κB expression, thereby inhibiting NF-κB binding to the Nurr1 promoter region (−605 to −418 bp); α-SYN does not affect Nurr1 mRNA stability or directly bind the Nurr1 promoter.","method":"Promoter deletion/reporter assays, ChIP for NF-κB at Nurr1 promoter, mRNA stability assays, overexpression of WT and A53T α-SYN","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at endogenous promoter, promoter deletion mapping, mRNA stability control, single lab","pmids":["32477062"],"is_preprint":false},{"year":2012,"finding":"NR4A2 directly transactivates the MMP-13 promoter through its DNA-binding domain in synoviocytes; a point mutation in the NR4A2 DNA-binding domain abolishes transcriptional activation of MMP-13, and endogenous NR4A2 knockdown reduces synoviocyte proliferation, migration, and MMP-13 expression.","method":"MMP-13 promoter reporter assays, DNA-binding domain point mutant, lentiviral shRNA knockdown, proliferation/migration/invasion assays","journal":"Arthritis and rheumatism","confidence":"High","confidence_rationale":"Tier 2 / Strong — DBD point mutant abolishing activity, complementary gain/loss-of-function, multiple functional readouts","pmids":["22275273"],"is_preprint":false},{"year":2019,"finding":"NURR1 activates skeletal muscle glucose uptake and glycogen storage; transgenic overexpression of NURR1 in skeletal muscle enhances physical performance and prevents hyperglycemia and hepatic steatosis in mice.","method":"Transgenic mouse overexpression, metabolic phenotyping (glucose tolerance, glycogen assays), exercise-response enhancer analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic overexpression with specific metabolic phenotypes, single lab","pmids":["31110021"],"is_preprint":false},{"year":2022,"finding":"Nurr1 recruits the CoREST/HDAC1/G9a/EZH2 transcription repressor complex to the HIV LTR by directly binding consensus Nurr1 binding sites in the U3 region, silencing HIV transcription in microglial cells; mutation of the Nurr1 DNA-binding domain blocks HIV suppression.","method":"ChIP assay, Nurr1 DBD mutant, Nurr1 overexpression/knockdown, transcriptomic analysis","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct binding and complex recruitment, DBD mutant abolishes function, gain/loss-of-function in multiple human microglial models","pmids":["35797416"],"is_preprint":false},{"year":2020,"finding":"Nurr1 performs anti-inflammatory function partly by directly binding the RasGRP1 intron to regulate RasGRP1 expression, which in turn modulates the Ras-Raf-MEK-ERK signaling cascade during LPS-induced inflammation in microglia.","method":"ChIP-seq in LPS-stimulated BV2 cells, RasGRP1 expression analysis, ERK pathway activation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq identifying direct binding, pathway activation assays, single lab","pmids":["32612143"],"is_preprint":false},{"year":2020,"finding":"Nurr1 suppresses NF-κB/NLRP3 inflammasome signaling in Müller cells; high glucose decreases Nurr1 expression and nuclear translocation, leading to p65 activation and NLRP3 upregulation via p65 binding to the NLRP3 promoter.","method":"Nurr1 overexpression/knockdown, nuclear fractionation, ChIP for p65 at NLRP3 promoter, in vivo Nurr1 agonist treatment in STZ mouse model","journal":"Neuropeptides","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for p65 at NLRP3 promoter, nuclear translocation tracking, in vivo agonist rescue, single lab","pmids":["32461025"],"is_preprint":false},{"year":2021,"finding":"NR4A2 function in the medial habenula is required for reinstatement of cocaine-associated behaviors; HDAC3 disengages from the Nr4a2 locus in the MHb during cocaine-primed reinstatement, and loss of NR4A2 function via a dominant-negative splice variant (NURR2C) in the MHb blocks reinstatement.","method":"ChIP for HDAC3 at Nr4a2 locus in MHb, stereotaxic viral delivery of dominant-negative NURR2C, behavioral cocaine reinstatement assay","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-based epigenetic evidence plus dominant-negative loss-of-function with specific behavioral readout, single lab","pmids":["30998946"],"is_preprint":false},{"year":2009,"finding":"Nurr1 protein is expressed in microglia and located in both cytoplasm and nucleus; LPS stimulation increases Nurr1 expression and promotes its translocation from cytoplasm to nucleus via ERK, JNK, and PI3K/Akt pathways (ERK partially mediates nuclear translocation).","method":"Western blot, immunofluorescence, subcellular fractionation, pathway inhibitors (ERK, JNK, P38 MAPK, PI3K/Akt) in primary microglia","journal":"Neuroimmunomodulation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — fractionation plus pharmacological inhibitors, multiple pathways tested, single lab","pmids":["19246938"],"is_preprint":false},{"year":2013,"finding":"Nurr1 expression in hippocampal neurons is regulated in an activity-dependent manner via voltage-dependent calcium channels (VDCCs) and calcineurin, but not CaMK; blocking VDCCs or calcineurin prevents activity-induced Nurr1 upregulation.","method":"High KCl/bicuculline stimulation, tetrodotoxin blockade, pharmacological VDCC inhibitors, calcineurin and CaMK inhibitors, Western blot in primary hippocampal neurons","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological dissection with multiple inhibitors, single lab, primary neurons","pmids":["24291696"],"is_preprint":false},{"year":2016,"finding":"The p53 pathway induces miR-34 expression, which directly suppresses NR4A2 via a miRNA recognition element in the NR4A2 3' UTR; conversely, NR4A2 overexpression blocks induction of p53 target genes including mir-34a and rescues cells from p53-induced proliferation inhibition, forming a feedback network.","method":"3' UTR reporter screen, miR-34 overexpression, p53 pathway activation, mutagenesis of miRNA recognition element, proliferation rescue assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3' UTR reporter mutagenesis, gain-of-function, epistasis rescue, single lab","pmids":["27121375"],"is_preprint":false},{"year":2020,"finding":"Chloroquine directly binds the Nurr1 ligand-binding domain and promotes its transcriptional activity; it also upregulates Nurr1 expression via the CREB signaling pathway. Chloroquine activates TREG cell differentiation and Foxp3 expression in a Nurr1-dependent manner in vitro and in an IBD animal model.","method":"Ligand binding assay (direct binding to Nurr1 LBD), T cell differentiation assays, Nurr1 knockout/knockdown functional rescue, IBD mouse model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay, Nurr1-dependent functional rescue, in vivo confirmation, single lab","pmids":["31664129"],"is_preprint":false},{"year":2021,"finding":"Amodiaquine, chloroquine, and cytosporone B directly bind the Nurr1 LBD as detected by NMR structural footprinting, whereas other reported NR4A modulators (C-DIM12, celastrol, camptothecin, IP7e, isoalantolactone, TMPA, and three HTS derivatives) do not bind the Nurr1 LBD.","method":"Protein NMR structural footprinting, transcription assays (Nurr1-dependent and Nurr1-independent)","journal":"Journal of medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural footprinting with functional transcription assays, direct binding vs. non-binding panel tested, single lab","pmids":["33289551"],"is_preprint":false},{"year":2022,"finding":"LUCAT1 lncRNA controls splicing and stability of NR4A2 mRNA by interacting with RNA-binding proteins hnRNP C, M, and A2B1; loss of LUCAT1 leads to altered splicing and reduced/delayed NR4A2 expression upon LPS stimulation, while NR4A2-deficient cells show elevated inflammatory gene expression.","method":"RNA-binding protein mass spectrometry (CHIRP-MS), RNA immunoprecipitation, splicing analysis, NR4A2 knockdown with inflammatory gene expression readout","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based RBP identification, RIP, splicing analysis, loss-of-function with functional consequence, single lab","pmids":["36577072"],"is_preprint":false},{"year":2015,"finding":"NR4A2 directly transactivates the distal prolactin (PRL) promoter in synoviocytes, requiring a functional DNA-binding domain; deletional analysis maps the NR4A2-responsive region to −270 to −32 bp, and shRNA depletion of endogenous NR4A receptors reduces basal and PGE2-induced PRL levels by 95%.","method":"Reporter assays with deletional and DBD mutant constructs, shRNA knockdown, ELISA for secreted PRL","journal":"Journal of inflammation (London, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter deletion mapping, DBD requirement, loss-of-function KD with functional readout, single lab","pmids":["25717285"],"is_preprint":false},{"year":2020,"finding":"NR4A2 directly suppresses CCR5 transcription by binding its promoter and induces M2 macrophage polarization; NR4A2 overexpression in a diabetic cardiomyopathy rat model reduces M1 macrophage proportion and alleviates myocardial injury in a CCR5-dependent manner.","method":"Bioinformatic prediction of NR4A2 binding, ChIP/reporter validation of CCR5 promoter binding, NR4A2 overexpression in rats, M1/M2 macrophage flow cytometry","journal":"Microvascular research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ChIP/reporter binding described but limited methodological detail, single lab, in vivo overexpression only","pmids":["34774582"],"is_preprint":false},{"year":2020,"finding":"NR4A2 is a downstream target of Notch1 signaling in hepatocellular carcinoma; overexpression of active Notch1 (ICN1) increases NR4A2 expression, while Notch1 knockdown decreases NR4A2, and both genes co-operatively suppress p21 and p63 to promote HCC cell growth.","method":"Notch1 ICN1 overexpression and knockdown, qPCR/western blot of NR4A2, cell proliferation and FACS assays","journal":"Oncotarget","confidence":"Low","confidence_rationale":"Tier 3 / Weak — upstream regulator identified by OE/KD, but direct binding/mechanism not shown; single lab","pmids":["28423575"],"is_preprint":false},{"year":2021,"finding":"NURR1 regulates autophagy-mediated gemcitabine resistance in pancreatic cancer cells via a NURR1-ATG7/ATG12 axis; NURR1 is required for gemcitabine-induced cytoprotective autophagy, and its knockdown (siRNA or CRISPR/Cas9) or antagonism by C-DIM12 restores gemcitabine sensitivity.","method":"RNA sequencing in NURR1-expressing and CRISPR-KO cells, KEGG pathway analysis, NURR1 KD/KO and antagonist treatment, autophagy and viability assays","journal":"Cancer research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq with CRISPR-KO, functional autophagy assays, pharmacological antagonist, single lab","pmids":["35582016"],"is_preprint":false},{"year":2022,"finding":"An age-dependent shift in NURR1 dimerization occurs in human RPE cells, from NURR1-RXRα heterodimers toward NURR1-NURR1 homodimers; NURR1 overexpression and activation attenuates TNF-α-induced epithelial-to-mesenchymal transition in human RPE cells independently of age.","method":"Co-immunoprecipitation of NURR1 dimerization states from primary human RPE cells, overexpression and pharmacological activation, EMT marker analysis, in vivo AMD mouse models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of dimerization states from primary human cells, gain-of-function with functional EMT readout, in vivo model, single lab","pmids":["35867766"],"is_preprint":false},{"year":1996,"finding":"HZF-3 (an alias of NURR1/NR4A2) is an immediate-early gene induced by membrane depolarization in PC12 cells and by seizures in rat brain; it encodes a protein that specifically binds the NGFI-B response element (NBRE) by EMSA.","method":"EMSA demonstrating specific NBRE binding, Northern blot induction kinetics following depolarization and seizure","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA DNA-binding demonstration, activity-dependent induction, single lab","pmids":["8737662"],"is_preprint":false},{"year":2020,"finding":"NR4A2 promotes ESCC growth; METTL3-mediated m6A methylation of NR4A2 mRNA, stabilized by IGF2BP2, increases NR4A2 expression in response to methionine/SAM, and NR4A2 knockdown reduces ESCC cell proliferation.","method":"RNA m6A methylation analysis, IGF2BP2 RIP, NR4A2 siRNA knockdown, proliferation assays, integrative omics","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP validation of m6A reader binding, KD with proliferation readout, integrative omics, single lab","pmids":["38570607"],"is_preprint":false},{"year":2020,"finding":"Nurr1 directly targets the CDK4 promoter in gastric cancer cells to enhance CDK4 expression and facilitate cell proliferation; Nurr1 is induced by H. pylori via the PI3K/AKT-Sp1 pathway, with Sp1 binding the Nurr1 promoter.","method":"ChIP for Nurr1 at CDK4 promoter, reporter assays, Nurr1 knockdown/overexpression, in vitro and xenograft proliferation assays","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct CDK4 promoter occupancy, gain/loss-of-function with proliferation phenotype, single lab","pmids":["32114387"],"is_preprint":false}],"current_model":"NR4A2/Nurr1 is a ligand-regulated orphan nuclear receptor transcription factor that binds NBRE and NurRE DNA elements as monomers, homodimers, or heterodimers with RXRα; it directly regulates genes required for dopaminergic neuron identity (TH, AADC, VMAT2, DAT), exerts anti-inflammatory effects in glia by docking to NF-κB-p65 and recruiting the CoREST repressor complex, is covalently activated by endogenous ligands (PGE1/PGA1, DHI) at a non-canonical LBD pocket centered on Cys566, is subject to GSK-3-mediated phosphorylation and proteasomal degradation driven by α-synuclein, and controls immune cell fate (Treg induction via Foxp3, Th17 maturation via IL-21, macrophage M2 polarization via arginase 1) through direct promoter binding and co-regulator recruitment."},"narrative":{"mechanistic_narrative":"NR4A2/Nurr1 is a ligand-regulated orphan nuclear receptor transcription factor that controls cell-type identity and inflammatory gene programs by binding NGFI-B response elements (NBRE) as a monomer and forming higher-order complexes on Nur-responsive elements [PMID:8737662, PMID:31723028, PMID:15485875]. Structural work shows that two NR4A2 DNA-binding-domain molecules bind independently to everted repeats but form a dedicated dimer interface on inverted repeats, with Val298 essential for dimerization [PMID:31723028]. In dopaminergic neurons it directly drives the machinery of dopamine synthesis and storage by upregulating AADC and VMAT2 [PMID:12915123]. NR4A2 functions broadly as a transcriptional repressor of inflammation: it docks to NF-κB-p65 on inflammatory promoters and recruits the CoREST corepressor complex to clear p65 and silence transcription, a mechanism it redeploys to recruit CoREST/HDAC1/G9a/EZH2 to the HIV LTR and silence proviral transcription through direct DNA-binding-domain contacts [PMID:19345186, PMID:35797416]. Although classified as an orphan receptor, its non-canonical ligand-binding domain is covalently activated by endogenous lipids and dopamine metabolites — PGA1 and the dopamine metabolite DHI each form a Michael adduct with Cys566 and stimulate transcriptional activity, and the AF-2 helix shifts conformation upon ligand binding [PMID:32451509, PMID:30853418]. NR4A2 activity is further tuned by RXRα heterodimerization, where RXRα ligands paradoxically activate transcription by promoting heterodimer dissociation to release an active Nurr1 monomer [PMID:37102494]. Across immune lineages it acts as a fate-determining factor, binding the Foxp3 locus to induce regulatory T cells, sustaining Th17 differentiation through autocrine IL-21, and promoting M2 macrophage polarization via arginase-1 [PMID:21468021, PMID:23437182, PMID:25953901]. Its abundance and activity are regulated post-translationally by GSK-3-mediated phosphorylation that targets it for proteasomal degradation in an α-synuclein-driven loop relevant to Parkinson's disease [PMID:34609698].","teleology":[{"year":1996,"claim":"Established NR4A2 as an inducible, sequence-specific DNA-binding factor, defining its identity as a transcription factor responsive to neuronal activity.","evidence":"EMSA demonstrating specific NBRE binding plus Northern blot induction after depolarization and seizure in PC12 cells and rat brain","pmids":["8737662"],"confidence":"Medium","gaps":["Did not identify endogenous target genes","No structural basis for DNA recognition"]},{"year":2003,"claim":"Showed NR4A2 directly programs dopamine neuron physiology, linking the transcription factor to the biosynthetic and storage machinery of dopaminergic identity.","evidence":"Inducible Nurr1 cell line, retroviral overexpression, in situ hybridization in knockout embryos, and dopamine content assays","pmids":["12915123"],"confidence":"High","gaps":["Direct promoter occupancy on AADC/VMAT2 not resolved here","Did not address co-regulator requirements"]},{"year":2009,"claim":"Defined the principal anti-inflammatory mechanism: NR4A2 represses NF-κB target genes by docking to p65 and recruiting the CoREST corepressor complex, explaining how a transcription factor can act as a context-dependent repressor.","evidence":"ChIP, co-IP, reporter assays, and loss-of-function in microglia and astrocytes with inflammatory/neurotoxicity readouts","pmids":["19345186"],"confidence":"High","gaps":["Signal that triggers p65 docking incompletely defined","Generality across other inflammatory loci established later"]},{"year":2011,"claim":"Extended NR4A2 from neuronal identity to immune cell fate, showing it directly licenses the Treg program by binding the Foxp3 locus and depositing permissive chromatin marks.","evidence":"ChIP at Foxp3 locus, ectopic expression, conditional T-cell knockout, suppression assays, and colitis model","pmids":["21468021"],"confidence":"High","gaps":["Co-regulators mediating permissive histone marks not identified","Relationship to its repressive CoREST mode unclear"]},{"year":2013,"claim":"Refined the immune role by placing NR4A2 in Th17 maturation through an autocrine IL-21 circuit, distinguishing its function from the master regulator RORγt.","evidence":"siRNA knockdown, in vitro Th17 differentiation, IL-21 cytokine rescue, and in vivo EAE model","pmids":["23437182"],"confidence":"High","gaps":["Direct IL-21 promoter binding not shown","Interplay with the Treg-promoting role in the same cells unresolved"]},{"year":2019,"claim":"Resolved how an orphan receptor is endogenously controlled, showing the dopamine metabolite DHI covalently engages a non-canonical LBD pocket at Cys566 to activate transcription.","evidence":"X-ray crystallography, biophysical binding assays, cellular transcription assays, and zebrafish model","pmids":["30853418"],"confidence":"High","gaps":["Physiological concentrations of DHI in target cells not established","Reversibility of the covalent adduct unaddressed"]},{"year":2019,"claim":"Provided the structural logic of NR4A2 DNA recognition, distinguishing independent binding on everted repeats from a novel dimer interface on inverted repeats.","evidence":"X-ray crystal structures of the DBD on inverted and everted elements with Val298Lys mutagenesis and EMSA","pmids":["31723028"],"confidence":"High","gaps":["Functional consequence of homodimer vs monomer binding on target genes not mapped","Full-length receptor context not captured"]},{"year":2020,"claim":"Identified an endogenous lipid ligand mechanism, with PGA1 forming a Cys566 Michael adduct and driving a 21-degree AF-2 helix shift that activates transcription, and validated relevance in vivo.","evidence":"2.05 Å crystal structure of Nurr1-LBD/PGA1, biophysical binding, mutagenesis, cellular assays, and MPTP mouse 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Favors Osteoblastic Differentiation of MSCs.","date":"2017","source":"Stem cells international","url":"https://pubmed.ncbi.nlm.nih.gov/28769982","citation_count":21,"is_preprint":false},{"pmid":"24291696","id":"PMC_24291696","title":"Nurr1 expression is regulated by voltage-dependent calcium channels and calcineurin in cultured hippocampal neurons.","date":"2013","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/24291696","citation_count":20,"is_preprint":false},{"pmid":"35582016","id":"PMC_35582016","title":"Nuclear Receptor 4A2 (NR4A2/NURR1) Regulates Autophagy and Chemoresistance in Pancreatic Ductal Adenocarcinoma.","date":"2021","source":"Cancer research communications","url":"https://pubmed.ncbi.nlm.nih.gov/35582016","citation_count":19,"is_preprint":false},{"pmid":"28423575","id":"PMC_28423575","title":"Activated Notch signaling augments cell growth in hepatocellular carcinoma via up-regulating the nuclear receptor 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co-immunoprecipitation, reporter assays, loss-of-function (siRNA/knockout) with defined inflammatory phenotype readout\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal ChIP, co-IP for complex assembly, functional KD with specific cytokine/neurotoxicity readout, replicated across microglia and astrocytes\",\n      \"pmids\": [\"19345186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Prostaglandin E1 (PGE1) and its metabolite PGA1 directly bind the ligand-binding domain (LBD) of Nurr1; PGA1 forms a covalent Michael adduct with Cys566 and induces a 21° conformational shift of the activation function-2 helix (H12), stimulating Nurr1 transcriptional activity.\",\n      \"method\": \"X-ray crystallography (2.05 Å structure of Nurr1-LBD/PGA1), biophysical binding assays, site-directed mutagenesis, cellular transcription assays, in vivo MPTP mouse model\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mutagenesis, in vitro binding assays, and in vivo validation in one study\",\n      \"pmids\": [\"32451509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The dopamine metabolite 5,6-dihydroxyindole (DHI) binds directly to the Nurr1 LBD within a non-canonical pocket, forming a covalent adduct with Cys566, and stimulates Nurr1 transcriptional activity including target genes governing dopamine homeostasis.\",\n      \"method\": \"X-ray crystallography, biophysical binding assays, cellular transcription assays, zebrafish functional model\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus functional validation in cells and in vivo zebrafish model in one study\",\n      \"pmids\": [\"30853418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RXRα ligands activate Nurr1-RXRα transcription by weakening Nurr1-RXRα LBD heterodimer affinity and promoting heterodimer dissociation (PPI inhibition), releasing a transcriptionally active Nurr1 monomer from a repressive heterodimeric complex — a mechanism distinct from classical agonism.\",\n      \"method\": \"NMR spectroscopy structural footprinting, protein-protein interaction assays, cellular transcription assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural data plus PPI assays plus functional transcription assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"37102494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"X-ray crystal structures of the NR4A2 DNA-binding domain bound to inverted and everted Nur-responsive elements reveal that two NR4A2-DBD molecules bind independently to the everted repeat but form a novel dimer interface on the inverted repeat; substitution of interface residue Val298 to Lys abolishes dimerization.\",\n      \"method\": \"X-ray crystallography (2.6–2.8 Å), site-directed mutagenesis, EMSA/biochemical binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures with mutagenesis validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31723028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nurr1 directly regulates dopamine synthesis and storage in MN9D dopamine cells by increasing expression of AADC and VMAT2; VMAT2 upregulation requires continuous Nurr1 expression, and both AADC and VMAT2 are deregulated in Nurr1 knockout embryo midbrain.\",\n      \"method\": \"Inducible Nurr1 cell line, retroviral overexpression, in situ hybridization in knockout embryos, dopamine content assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function inducible system, loss-of-function knockout, multiple target genes confirmed in vivo and in vitro\",\n      \"pmids\": [\"12915123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nr4a2 directly binds regulatory regions of the Foxp3 gene locus, mediates permissive histone modifications, and is required for induction and maintenance of Foxp3-expressing regulatory T cells; Nr4a2 deletion attenuates Treg induction and causes aberrant Th1 responses.\",\n      \"method\": \"ChIP at Foxp3 locus, ectopic expression, conditional knockout in T cells, in vitro and in vivo Treg suppression assays, colitis model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct binding, conditional KO with specific immune phenotype, multiple in vitro and in vivo assays\",\n      \"pmids\": [\"21468021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"α-Synuclein activates GSK-3, which phosphorylates NURR1 at a domain comprising amino acids 123-PSSPPTPSTPS-134, leading to ubiquitination and proteasomal degradation of NURR1 and loss of dopaminergic markers.\",\n      \"method\": \"Sequential deletion mutants and single-point mutants of NURR1, GSK-3 activity assays, proteasome inhibitor rescue, immunoprecipitation of ubiquitinated NURR1\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis mapping of phosphorylation domain, biochemical ubiquitination and proteasome assays, multiple orthogonal methods in one study\",\n      \"pmids\": [\"34609698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Multiple Nurr1 splice variants (nurr1a, nurr1b, nurr1c, TINUR, nurr2, nurr2c) are produced in rat and human dopamine neurons via alternative splicing in exons 3 and 7; these variants have significantly reduced transcriptional activity compared with full-length Nurr1, and nurr2/nurr2c act as dominant negatives.\",\n      \"method\": \"RT-PCR identification of splice variants, transfection reporter assays in dopaminergic SK-N-AS cells, dominant-negative functional assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple variant identification by RT-PCR, functional transactivation assays, single lab\",\n      \"pmids\": [\"16313515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Nurr1 directly transactivates the osteocalcin (Ocn) gene in osteoblasts by binding as a monomer to an NBRE-like element in the proximal Ocn promoter; chromatin immunoprecipitation confirmed endogenous Nurr1 occupancy at this site, and mutation of the NBRE-like site markedly blunted transcriptional response.\",\n      \"method\": \"EMSA, chromatin immunoprecipitation, promoter-luciferase reporter assays, adenoviral Nurr1 overexpression in primary osteoblasts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP of endogenous protein at promoter, EMSA, reporter mutagenesis, and primary cell functional assay in one study\",\n      \"pmids\": [\"15485875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nr4a2 is expressed downstream of Brn3a in habenular neurons and mediates expression of a subset of Brn3a-regulated transcripts, establishing Nr4a2 as a component of a gene regulatory pathway for habenula development.\",\n      \"method\": \"Microarray in Brn3a null embryos, in situ hybridization, genetic epistasis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis by microarray in null embryos, in situ hybridization confirmation, single lab\",\n      \"pmids\": [\"19906978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nr4a2 is required for specification of a GABAergic amacrine cell subtype in the retina; targeted inactivation results in loss of dopaminergic and p57Kip2+ amacrine cells with a concomitant increase in calbindin+ ACs, and misexpressed Nr4a2 promotes GABAergic AC differentiation while its dominant-negative form suppresses it.\",\n      \"method\": \"Conditional knockout, retroviral misexpression, dominant-negative overexpression, immunofluorescence phenotyping\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complementary gain- and loss-of-function with defined cellular phenotypes, necessity and sufficiency established\",\n      \"pmids\": [\"19692620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PGE2 rapidly induces NR4A2 expression in colorectal carcinoma cells via a cAMP/PKA-dependent mechanism; NR4A2 binds cognate NBRE response elements and enhances transcription, and PGE2-mediated protection from apoptosis is completely blocked by a dominant-negative NR4A2 construct.\",\n      \"method\": \"Reporter assays with NBRE construct, dominant-negative NR4A2, PKA pathway inhibitors, apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative functional rescue, reporter assays, pathway inhibitors, single lab\",\n      \"pmids\": [\"16293616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PGE2-induced NR4A2 increases fatty acid oxidation in colon cancer cells by directly binding Nur77-binding response elements (NBREs) in the promoters of fatty acid oxidation genes and recruiting transcriptional coactivators.\",\n      \"method\": \"ChIP demonstrating NR4A2 binding to NBRE elements in FAO gene promoters, coactivator recruitment assays, fatty acid oxidation measurements, gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at endogenous gene promoters, coactivator recruitment, functional FAO assay, single lab\",\n      \"pmids\": [\"21757690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NR4A2 is required for full Th17 differentiation by controlling autocrine IL-21 signaling; siRNA knockdown of NR4A2 prevents IL-17 and IL-21 production despite normal RORγt expression, and exogenous IL-21 restores Th17 differentiation in NR4A2-deficient cells.\",\n      \"method\": \"siRNA knockdown, in vitro Th17 differentiation assays, cytokine rescue with exogenous IL-21, in vivo siRNA treatment in EAE model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KD with specific cytokine phenotype, epistasis rescue by IL-21, replicated in vitro and in vivo\",\n      \"pmids\": [\"23437182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nurr1 interacts directly with p53 and represses p53 transcriptional activity in an interaction-dependent and dose-dependent manner, decreasing Bax expression and protecting cells from doxorubicin-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation of Nurr1-p53 complex, reporter assays for p53 transcriptional activity, siRNA knockdown of Nurr1, apoptosis assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP, reporter assays, KD with functional readout, single lab\",\n      \"pmids\": [\"19671681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nurr1 and Foxa2 physically interact and synergistically protect midbrain dopamine neurons; AAV-mediated co-delivery of both factors in a PD mouse model markedly protects neurons and motor behaviors through both cell-autonomous actions in DA neurons and paracrine actions in neighboring glia.\",\n      \"method\": \"Co-immunoprecipitation of Nurr1-Foxa2 interaction, AAV gene delivery in PD mouse model, behavioral and histological assessment\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction, in vivo gain-of-function with specific neuronal/behavioral phenotype, single lab\",\n      \"pmids\": [\"25759364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nr4a2 promotes alternative (M2) macrophage polarization; exogenous Nr4a2 expression transcriptionally activates arginase 1 by directly binding its promoter, and Nr4a2-expressing macrophages confer protection in endotoxin-induced sepsis.\",\n      \"method\": \"Chromatin immunoprecipitation/reporter assay for arginase 1 promoter, overexpression and knockdown in macrophages, adoptive transfer sepsis model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP/reporter assay at target promoter, adoptive transfer functional assay, single lab\",\n      \"pmids\": [\"25953901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nurr1 transcriptionally regulates alpha-synuclein expression; decreased Nurr1 expression (as seen in PD patients with Nurr1 mutations) increases alpha-synuclein transcription.\",\n      \"method\": \"Nurr1 overexpression/knockdown with measurement of alpha-synuclein mRNA and reporter assays\",\n      \"journal\": \"Neuroreport\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain- and loss-of-function with transcriptional readout, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"18463503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"α-Synuclein (WT or A53T) reduces Nurr1 transcription by downregulating NF-κB expression, thereby inhibiting NF-κB binding to the Nurr1 promoter region (−605 to −418 bp); α-SYN does not affect Nurr1 mRNA stability or directly bind the Nurr1 promoter.\",\n      \"method\": \"Promoter deletion/reporter assays, ChIP for NF-κB at Nurr1 promoter, mRNA stability assays, overexpression of WT and A53T α-SYN\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at endogenous promoter, promoter deletion mapping, mRNA stability control, single lab\",\n      \"pmids\": [\"32477062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NR4A2 directly transactivates the MMP-13 promoter through its DNA-binding domain in synoviocytes; a point mutation in the NR4A2 DNA-binding domain abolishes transcriptional activation of MMP-13, and endogenous NR4A2 knockdown reduces synoviocyte proliferation, migration, and MMP-13 expression.\",\n      \"method\": \"MMP-13 promoter reporter assays, DNA-binding domain point mutant, lentiviral shRNA knockdown, proliferation/migration/invasion assays\",\n      \"journal\": \"Arthritis and rheumatism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — DBD point mutant abolishing activity, complementary gain/loss-of-function, multiple functional readouts\",\n      \"pmids\": [\"22275273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NURR1 activates skeletal muscle glucose uptake and glycogen storage; transgenic overexpression of NURR1 in skeletal muscle enhances physical performance and prevents hyperglycemia and hepatic steatosis in mice.\",\n      \"method\": \"Transgenic mouse overexpression, metabolic phenotyping (glucose tolerance, glycogen assays), exercise-response enhancer analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic overexpression with specific metabolic phenotypes, single lab\",\n      \"pmids\": [\"31110021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nurr1 recruits the CoREST/HDAC1/G9a/EZH2 transcription repressor complex to the HIV LTR by directly binding consensus Nurr1 binding sites in the U3 region, silencing HIV transcription in microglial cells; mutation of the Nurr1 DNA-binding domain blocks HIV suppression.\",\n      \"method\": \"ChIP assay, Nurr1 DBD mutant, Nurr1 overexpression/knockdown, transcriptomic analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct binding and complex recruitment, DBD mutant abolishes function, gain/loss-of-function in multiple human microglial models\",\n      \"pmids\": [\"35797416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Nurr1 performs anti-inflammatory function partly by directly binding the RasGRP1 intron to regulate RasGRP1 expression, which in turn modulates the Ras-Raf-MEK-ERK signaling cascade during LPS-induced inflammation in microglia.\",\n      \"method\": \"ChIP-seq in LPS-stimulated BV2 cells, RasGRP1 expression analysis, ERK pathway activation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq identifying direct binding, pathway activation assays, single lab\",\n      \"pmids\": [\"32612143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Nurr1 suppresses NF-κB/NLRP3 inflammasome signaling in Müller cells; high glucose decreases Nurr1 expression and nuclear translocation, leading to p65 activation and NLRP3 upregulation via p65 binding to the NLRP3 promoter.\",\n      \"method\": \"Nurr1 overexpression/knockdown, nuclear fractionation, ChIP for p65 at NLRP3 promoter, in vivo Nurr1 agonist treatment in STZ mouse model\",\n      \"journal\": \"Neuropeptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for p65 at NLRP3 promoter, nuclear translocation tracking, in vivo agonist rescue, single lab\",\n      \"pmids\": [\"32461025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NR4A2 function in the medial habenula is required for reinstatement of cocaine-associated behaviors; HDAC3 disengages from the Nr4a2 locus in the MHb during cocaine-primed reinstatement, and loss of NR4A2 function via a dominant-negative splice variant (NURR2C) in the MHb blocks reinstatement.\",\n      \"method\": \"ChIP for HDAC3 at Nr4a2 locus in MHb, stereotaxic viral delivery of dominant-negative NURR2C, behavioral cocaine reinstatement assay\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-based epigenetic evidence plus dominant-negative loss-of-function with specific behavioral readout, single lab\",\n      \"pmids\": [\"30998946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nurr1 protein is expressed in microglia and located in both cytoplasm and nucleus; LPS stimulation increases Nurr1 expression and promotes its translocation from cytoplasm to nucleus via ERK, JNK, and PI3K/Akt pathways (ERK partially mediates nuclear translocation).\",\n      \"method\": \"Western blot, immunofluorescence, subcellular fractionation, pathway inhibitors (ERK, JNK, P38 MAPK, PI3K/Akt) in primary microglia\",\n      \"journal\": \"Neuroimmunomodulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — fractionation plus pharmacological inhibitors, multiple pathways tested, single lab\",\n      \"pmids\": [\"19246938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nurr1 expression in hippocampal neurons is regulated in an activity-dependent manner via voltage-dependent calcium channels (VDCCs) and calcineurin, but not CaMK; blocking VDCCs or calcineurin prevents activity-induced Nurr1 upregulation.\",\n      \"method\": \"High KCl/bicuculline stimulation, tetrodotoxin blockade, pharmacological VDCC inhibitors, calcineurin and CaMK inhibitors, Western blot in primary hippocampal neurons\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological dissection with multiple inhibitors, single lab, primary neurons\",\n      \"pmids\": [\"24291696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The p53 pathway induces miR-34 expression, which directly suppresses NR4A2 via a miRNA recognition element in the NR4A2 3' UTR; conversely, NR4A2 overexpression blocks induction of p53 target genes including mir-34a and rescues cells from p53-induced proliferation inhibition, forming a feedback network.\",\n      \"method\": \"3' UTR reporter screen, miR-34 overexpression, p53 pathway activation, mutagenesis of miRNA recognition element, proliferation rescue assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3' UTR reporter mutagenesis, gain-of-function, epistasis rescue, single lab\",\n      \"pmids\": [\"27121375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Chloroquine directly binds the Nurr1 ligand-binding domain and promotes its transcriptional activity; it also upregulates Nurr1 expression via the CREB signaling pathway. Chloroquine activates TREG cell differentiation and Foxp3 expression in a Nurr1-dependent manner in vitro and in an IBD animal model.\",\n      \"method\": \"Ligand binding assay (direct binding to Nurr1 LBD), T cell differentiation assays, Nurr1 knockout/knockdown functional rescue, IBD mouse model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay, Nurr1-dependent functional rescue, in vivo confirmation, single lab\",\n      \"pmids\": [\"31664129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Amodiaquine, chloroquine, and cytosporone B directly bind the Nurr1 LBD as detected by NMR structural footprinting, whereas other reported NR4A modulators (C-DIM12, celastrol, camptothecin, IP7e, isoalantolactone, TMPA, and three HTS derivatives) do not bind the Nurr1 LBD.\",\n      \"method\": \"Protein NMR structural footprinting, transcription assays (Nurr1-dependent and Nurr1-independent)\",\n      \"journal\": \"Journal of medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural footprinting with functional transcription assays, direct binding vs. non-binding panel tested, single lab\",\n      \"pmids\": [\"33289551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LUCAT1 lncRNA controls splicing and stability of NR4A2 mRNA by interacting with RNA-binding proteins hnRNP C, M, and A2B1; loss of LUCAT1 leads to altered splicing and reduced/delayed NR4A2 expression upon LPS stimulation, while NR4A2-deficient cells show elevated inflammatory gene expression.\",\n      \"method\": \"RNA-binding protein mass spectrometry (CHIRP-MS), RNA immunoprecipitation, splicing analysis, NR4A2 knockdown with inflammatory gene expression readout\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based RBP identification, RIP, splicing analysis, loss-of-function with functional consequence, single lab\",\n      \"pmids\": [\"36577072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NR4A2 directly transactivates the distal prolactin (PRL) promoter in synoviocytes, requiring a functional DNA-binding domain; deletional analysis maps the NR4A2-responsive region to −270 to −32 bp, and shRNA depletion of endogenous NR4A receptors reduces basal and PGE2-induced PRL levels by 95%.\",\n      \"method\": \"Reporter assays with deletional and DBD mutant constructs, shRNA knockdown, ELISA for secreted PRL\",\n      \"journal\": \"Journal of inflammation (London, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter deletion mapping, DBD requirement, loss-of-function KD with functional readout, single lab\",\n      \"pmids\": [\"25717285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NR4A2 directly suppresses CCR5 transcription by binding its promoter and induces M2 macrophage polarization; NR4A2 overexpression in a diabetic cardiomyopathy rat model reduces M1 macrophage proportion and alleviates myocardial injury in a CCR5-dependent manner.\",\n      \"method\": \"Bioinformatic prediction of NR4A2 binding, ChIP/reporter validation of CCR5 promoter binding, NR4A2 overexpression in rats, M1/M2 macrophage flow cytometry\",\n      \"journal\": \"Microvascular research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ChIP/reporter binding described but limited methodological detail, single lab, in vivo overexpression only\",\n      \"pmids\": [\"34774582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NR4A2 is a downstream target of Notch1 signaling in hepatocellular carcinoma; overexpression of active Notch1 (ICN1) increases NR4A2 expression, while Notch1 knockdown decreases NR4A2, and both genes co-operatively suppress p21 and p63 to promote HCC cell growth.\",\n      \"method\": \"Notch1 ICN1 overexpression and knockdown, qPCR/western blot of NR4A2, cell proliferation and FACS assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — upstream regulator identified by OE/KD, but direct binding/mechanism not shown; single lab\",\n      \"pmids\": [\"28423575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NURR1 regulates autophagy-mediated gemcitabine resistance in pancreatic cancer cells via a NURR1-ATG7/ATG12 axis; NURR1 is required for gemcitabine-induced cytoprotective autophagy, and its knockdown (siRNA or CRISPR/Cas9) or antagonism by C-DIM12 restores gemcitabine sensitivity.\",\n      \"method\": \"RNA sequencing in NURR1-expressing and CRISPR-KO cells, KEGG pathway analysis, NURR1 KD/KO and antagonist treatment, autophagy and viability assays\",\n      \"journal\": \"Cancer research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq with CRISPR-KO, functional autophagy assays, pharmacological antagonist, single lab\",\n      \"pmids\": [\"35582016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"An age-dependent shift in NURR1 dimerization occurs in human RPE cells, from NURR1-RXRα heterodimers toward NURR1-NURR1 homodimers; NURR1 overexpression and activation attenuates TNF-α-induced epithelial-to-mesenchymal transition in human RPE cells independently of age.\",\n      \"method\": \"Co-immunoprecipitation of NURR1 dimerization states from primary human RPE cells, overexpression and pharmacological activation, EMT marker analysis, in vivo AMD mouse models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of dimerization states from primary human cells, gain-of-function with functional EMT readout, in vivo model, single lab\",\n      \"pmids\": [\"35867766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"HZF-3 (an alias of NURR1/NR4A2) is an immediate-early gene induced by membrane depolarization in PC12 cells and by seizures in rat brain; it encodes a protein that specifically binds the NGFI-B response element (NBRE) by EMSA.\",\n      \"method\": \"EMSA demonstrating specific NBRE binding, Northern blot induction kinetics following depolarization and seizure\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA DNA-binding demonstration, activity-dependent induction, single lab\",\n      \"pmids\": [\"8737662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NR4A2 promotes ESCC growth; METTL3-mediated m6A methylation of NR4A2 mRNA, stabilized by IGF2BP2, increases NR4A2 expression in response to methionine/SAM, and NR4A2 knockdown reduces ESCC cell proliferation.\",\n      \"method\": \"RNA m6A methylation analysis, IGF2BP2 RIP, NR4A2 siRNA knockdown, proliferation assays, integrative omics\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP validation of m6A reader binding, KD with proliferation readout, integrative omics, single lab\",\n      \"pmids\": [\"38570607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Nurr1 directly targets the CDK4 promoter in gastric cancer cells to enhance CDK4 expression and facilitate cell proliferation; Nurr1 is induced by H. pylori via the PI3K/AKT-Sp1 pathway, with Sp1 binding the Nurr1 promoter.\",\n      \"method\": \"ChIP for Nurr1 at CDK4 promoter, reporter assays, Nurr1 knockdown/overexpression, in vitro and xenograft proliferation assays\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct CDK4 promoter occupancy, gain/loss-of-function with proliferation phenotype, single lab\",\n      \"pmids\": [\"32114387\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NR4A2/Nurr1 is a ligand-regulated orphan nuclear receptor transcription factor that binds NBRE and NurRE DNA elements as monomers, homodimers, or heterodimers with RXRα; it directly regulates genes required for dopaminergic neuron identity (TH, AADC, VMAT2, DAT), exerts anti-inflammatory effects in glia by docking to NF-κB-p65 and recruiting the CoREST repressor complex, is covalently activated by endogenous ligands (PGE1/PGA1, DHI) at a non-canonical LBD pocket centered on Cys566, is subject to GSK-3-mediated phosphorylation and proteasomal degradation driven by α-synuclein, and controls immune cell fate (Treg induction via Foxp3, Th17 maturation via IL-21, macrophage M2 polarization via arginase 1) through direct promoter binding and co-regulator recruitment.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NR4A2/Nurr1 is a ligand-regulated orphan nuclear receptor transcription factor that controls cell-type identity and inflammatory gene programs by binding NGFI-B response elements (NBRE) as a monomer and forming higher-order complexes on Nur-responsive elements [#37, #4, #9]. Structural work shows that two NR4A2 DNA-binding-domain molecules bind independently to everted repeats but form a dedicated dimer interface on inverted repeats, with Val298 essential for dimerization [#4]. In dopaminergic neurons it directly drives the machinery of dopamine synthesis and storage by upregulating AADC and VMAT2 [#5]. NR4A2 functions broadly as a transcriptional repressor of inflammation: it docks to NF-\\u03baB-p65 on inflammatory promoters and recruits the CoREST corepressor complex to clear p65 and silence transcription, a mechanism it redeploys to recruit CoREST/HDAC1/G9a/EZH2 to the HIV LTR and silence proviral transcription through direct DNA-binding-domain contacts [#0, #22]. Although classified as an orphan receptor, its non-canonical ligand-binding domain is covalently activated by endogenous lipids and dopamine metabolites \\u2014 PGA1 and the dopamine metabolite DHI each form a Michael adduct with Cys566 and stimulate transcriptional activity, and the AF-2 helix shifts conformation upon ligand binding [#1, #2]. NR4A2 activity is further tuned by RXR\\u03b1 heterodimerization, where RXR\\u03b1 ligands paradoxically activate transcription by promoting heterodimer dissociation to release an active Nurr1 monomer [#3]. Across immune lineages it acts as a fate-determining factor, binding the Foxp3 locus to induce regulatory T cells, sustaining Th17 differentiation through autocrine IL-21, and promoting M2 macrophage polarization via arginase-1 [#6, #14, #17]. Its abundance and activity are regulated post-translationally by GSK-3-mediated phosphorylation that targets it for proteasomal degradation in an \\u03b1-synuclein-driven loop relevant to Parkinson's disease [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established NR4A2 as an inducible, sequence-specific DNA-binding factor, defining its identity as a transcription factor responsive to neuronal activity.\",\n      \"evidence\": \"EMSA demonstrating specific NBRE binding plus Northern blot induction after depolarization and seizure in PC12 cells and rat brain\",\n      \"pmids\": [\"8737662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify endogenous target genes\", \"No structural basis for DNA recognition\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed NR4A2 directly programs dopamine neuron physiology, linking the transcription factor to the biosynthetic and storage machinery of dopaminergic identity.\",\n      \"evidence\": \"Inducible Nurr1 cell line, retroviral overexpression, in situ hybridization in knockout embryos, and dopamine content assays\",\n      \"pmids\": [\"12915123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct promoter occupancy on AADC/VMAT2 not resolved here\", \"Did not address co-regulator requirements\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the principal anti-inflammatory mechanism: NR4A2 represses NF-\\u03baB target genes by docking to p65 and recruiting the CoREST corepressor complex, explaining how a transcription factor can act as a context-dependent repressor.\",\n      \"evidence\": \"ChIP, co-IP, reporter assays, and loss-of-function in microglia and astrocytes with inflammatory/neurotoxicity readouts\",\n      \"pmids\": [\"19345186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that triggers p65 docking incompletely defined\", \"Generality across other inflammatory loci established later\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended NR4A2 from neuronal identity to immune cell fate, showing it directly licenses the Treg program by binding the Foxp3 locus and depositing permissive chromatin marks.\",\n      \"evidence\": \"ChIP at Foxp3 locus, ectopic expression, conditional T-cell knockout, suppression assays, and colitis model\",\n      \"pmids\": [\"21468021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-regulators mediating permissive histone marks not identified\", \"Relationship to its repressive CoREST mode unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Refined the immune role by placing NR4A2 in Th17 maturation through an autocrine IL-21 circuit, distinguishing its function from the master regulator ROR\\u03b3t.\",\n      \"evidence\": \"siRNA knockdown, in vitro Th17 differentiation, IL-21 cytokine rescue, and in vivo EAE model\",\n      \"pmids\": [\"23437182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct IL-21 promoter binding not shown\", \"Interplay with the Treg-promoting role in the same cells unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved how an orphan receptor is endogenously controlled, showing the dopamine metabolite DHI covalently engages a non-canonical LBD pocket at Cys566 to activate transcription.\",\n      \"evidence\": \"X-ray crystallography, biophysical binding assays, cellular transcription assays, and zebrafish model\",\n      \"pmids\": [\"30853418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological concentrations of DHI in target cells not established\", \"Reversibility of the covalent adduct unaddressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided the structural logic of NR4A2 DNA recognition, distinguishing independent binding on everted repeats from a novel dimer interface on inverted repeats.\",\n      \"evidence\": \"X-ray crystal structures of the DBD on inverted and everted elements with Val298Lys mutagenesis and EMSA\",\n      \"pmids\": [\"31723028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of homodimer vs monomer binding on target genes not mapped\", \"Full-length receptor context not captured\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified an endogenous lipid ligand mechanism, with PGA1 forming a Cys566 Michael adduct and driving a 21-degree AF-2 helix shift that activates transcription, and validated relevance in vivo.\",\n      \"evidence\": \"2.05 \\u00c5 crystal structure of Nurr1-LBD/PGA1, biophysical binding, mutagenesis, cellular assays, and MPTP mouse model\",\n      \"pmids\": [\"32451509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether multiple endogenous Cys566 ligands compete in vivo unknown\", \"Selectivity over other Cys residues not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected NR4A2 abundance to Parkinson's pathology by mapping a GSK-3 phosphodegron that drives \\u03b1-synuclein-dependent ubiquitination and proteasomal loss of the receptor.\",\n      \"evidence\": \"Deletion and point mutants spanning aa123-134, GSK-3 activity assays, proteasome inhibitor rescue, and ubiquitination IP\",\n      \"pmids\": [\"34609698\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating ubiquitination not identified\", \"Direct vs indirect role of GSK-3 not fully separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Generalized the CoREST repression mechanism to viral silencing, showing NR4A2 recruits CoREST/HDAC1/G9a/EZH2 to the HIV LTR via direct DBD-dependent binding.\",\n      \"evidence\": \"ChIP, DBD mutant, overexpression/knockdown, and transcriptomics in human microglial models\",\n      \"pmids\": [\"35797416\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether latency reversal can override this silencing unknown\", \"Endogenous signal recruiting the complex to LTR not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a non-classical activation logic in which RXR\\u03b1 ligands activate Nurr1-RXR\\u03b1 transcription by promoting heterodimer dissociation rather than by direct agonism.\",\n      \"evidence\": \"NMR structural footprinting, protein-protein interaction assays, and cellular transcription assays\",\n      \"pmids\": [\"37102494\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular ratio of monomer vs heterodimer states not quantified\", \"Target genes selectively affected by dissociation unmapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NR4A2 toggles between transcriptional activation and CoREST-mediated repression at distinct loci, and how endogenous ligand occupancy, RXR\\u03b1 dimerization, and GSK-3 degradation are integrated to set context-specific output, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking ligand state to activator/repressor switching\", \"Cell-type determinants of partner choice unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 6, 9, 22, 37]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 9, 20, 22, 37]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [26]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 5, 9, 22, 37]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 6, 14, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 10, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\"CoREST/HDAC1/G9a/EZH2 corepressor complex\", \"Nurr1-RXR\\u03b1 heterodimer\"],\n    \"partners\": [\"RELA\", \"RXRA\", \"CoREST\", \"TP53\", \"FOXA2\", \"GSK3\", \"SNCA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}