{"gene":"EDN3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1998,"finding":"ET-3 inhibits neuronal differentiation of enteric neural precursor cells in vitro, overriding GDNF-stimulated differentiation into neurons, thereby maintaining the precursor cell pool. At low cell density or in defined medium, ET-3 reduced cell proliferation; at high density with serum, ET-3 and GDNF had an additive proliferative effect.","method":"In vitro culture of HNK-1-immunoaffinity-isolated enteric neural crest precursors from quail embryos; cell counting, neurite quantification, proliferation assays","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean in vitro functional assay with isolated precursor cells, multiple conditions tested, single lab","pmids":["9578621"],"is_preprint":false},{"year":1990,"finding":"ET-3 (along with ET-1 and ET-2) functions as a co-mitogen for rat vascular smooth muscle cells, potentiating DNA synthesis induced by PDGF but unable to initiate DNA synthesis alone. ET-3 was less potent than ET-1 and ET-2 in this co-mitogenic effect.","method":"BrdU incorporation assay in cultured rat vascular smooth muscle cells; image analysis of stained nuclei","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro functional assay with quantitative readout, single lab, single method","pmids":["2102088"],"is_preprint":false},{"year":2006,"finding":"Genetic epistasis experiments in Sox10;Edn3 double mutant mice demonstrate that Edn3 and Sox10 act in a coordinate and balanced interaction required for normal enteric nervous system (ENS) and melanocyte development. Partial loss of Ednrb in Sox10 heterozygous mice impairs gut colonization by enteric crest cells at all stages, and increased apoptosis was found in vagal neural crest cells outside the gut in double mutants.","method":"Double mutant mouse phenotype analysis (Sox10;Edn3 and Sox10;Ednrb); immunohistochemistry for apoptosis, cell proliferation, neuronal/glial differentiation markers in neural crest cells","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double mutants, multiple orthogonal readouts (apoptosis, proliferation, differentiation, migration), replicates single-mutant findings","pmids":["16650841"],"is_preprint":false},{"year":1994,"finding":"ET-3 stimulates cGMP production in rat glomeruli and cultured mesangial cells via ETB receptor activation, with the mechanism dependent on intracellular Ca2+/calmodulin-mediated nitric oxide (NO) production; L-type Ca2+ channel influx was not required.","method":"cGMP accumulation assays in isolated rat glomerulus and cultured mesangial cells; pharmacological dissection using ETB agonist (IRL 1620), ETA antagonist (BQ123), NOS inhibitor (L-NMMA), BAPTA/AM, W-7, nicardipine","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro receptor pharmacology with reconstitution-level specificity, multiple inhibitors confirming mechanism, two cell systems tested","pmids":["7509343"],"is_preprint":false},{"year":1999,"finding":"ET-3 inhibits astroglial gap junction permeability and intercellular Ca2+ signaling exclusively via ETB receptors (effects blocked by ETB antagonist, not ETA antagonist), whereas ET-1 inhibits these same processes via both ETA and ETB receptors. ET-3 and ET-1 also induce intracellular Ca2+ increases in astrocytes with distinct response patterns depending on receptor subtype.","method":"Dye diffusion assays for gap junction permeability, intracellular Ca2+ imaging, pharmacological receptor subtype dissection with selective antagonists; cultured rat hippocampal and striatal astrocytes","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays, receptor pharmacology, single lab","pmids":["10516091"],"is_preprint":false},{"year":2017,"finding":"Epilation triggers upregulation of endogenous EDN3 in dermal papilla, secondary hair germ cells, and epidermis, which activates melanocyte stem cells (McSCs) via EDNRB signaling to regenerate follicular and epidermal melanocytes, causing skin and hair hyperpigmentation. Genetic and pharmacological blockade of EDNRB significantly inhibited McSC activation and hyperpigmentation after epilation.","method":"Mouse epilation model; transgenic and pharmacological (EDNRB inhibitor) disruption of EDNRB in vivo; immunofluorescence for melanocyte markers","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function (genetic knockout + pharmacological) with specific phenotypic readout, two orthogonal approaches converging on same mechanism","pmids":["28779103"],"is_preprint":false},{"year":2008,"finding":"ET-3 (and ET-1), acting via ETB receptors on human choriocarcinoma cells, activates p42/44 MAPK (ERK1/2) through Gi- and Gq-dependent pathways involving Src (downstream of Gi) and PKC (downstream of Gq) converging at Ras/Raf. This leads to transcriptional upregulation of c-fos and c-jun and increased cell growth.","method":"Western blot for MAPK phosphorylation; pharmacological inhibition of Gi, Gq, Src, PKC, Ras/Raf in JAR and Jeg-3 choriocarcinoma cell lines; receptor expression confirmed by RT-PCR","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological dissection steps with defined pathway readouts, single lab, cell line model","pmids":["18362896"],"is_preprint":false},{"year":2009,"finding":"EDN3 promoter hypermethylation (detected in 70% of primary breast carcinomas) is the predominant mechanism silencing EDN3 gene expression in breast cancer; treatment with 5-aza-2'-deoxycytidine and trichostatin A restored EDN3 mRNA expression in breast cancer cell lines in vitro.","method":"Methylation-specific PCR, Northern blot, real-time PCR, tissue microarray; demethylating agent treatment (5-aza-2'-deoxycytidine + trichostatin A) in breast cancer cell lines","journal":"Breast cancer research : BCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — methylation-specific PCR validated by functional reversal with demethylating agents, multiple patient cohorts, single lab","pmids":["19527488"],"is_preprint":false},{"year":2011,"finding":"ET3/Ednrb2 signaling is required for melanoblast migration in Xenopus laevis: Ednrb2 is expressed by melanoblasts from pre-migratory stages, ET3 is expressed near melanoblast destinations, and aberrant ET3/Ednrb2 signaling disrupts melanoblast migration in vivo while ET3 enhances melanoblast invasive ability in vitro.","method":"In situ hybridization for Ednrb2 and ET3 expression; in vivo morpholino-mediated knockdown and dominant-negative approaches; in vitro invasion assay with ET3","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function plus in vitro gain-of-function, multiple readouts, single lab","pmids":["21538684"],"is_preprint":false},{"year":1991,"finding":"ET-3 binds to two distinct receptor subtypes on rat aortic smooth muscle cells: a high-affinity ET-1/ET-2-preferring receptor (80–85% of sites, irreversible binding, subject to downregulation) and a lower-affinity subtype (15–20%) that binds all three ET isoforms with equal affinity in a reversible manner and is insensitive to downregulation.","method":"Radioligand binding assay ([125I]ET-1, [125I]ET-2, [125I]ET-3) with competition and dissociation kinetics; downregulation by pre-exposure to ET isoforms in cultured rat aortic smooth muscle cells","journal":"Journal of cardiovascular pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple radioligand binding assays with kinetic and competition analyses, single lab","pmids":["1725299"],"is_preprint":false},{"year":1992,"finding":"Substitution of lysine-181 to aspartic acid in the third transmembrane domain of the rat ETB receptor selectively reduces high-affinity binding of ET-3 (IC50 increases ~200-fold), while still permitting full inositol phosphate signaling at saturating ET-3 concentrations, indicating this residue is critical for ligand affinity but not G-protein coupling.","method":"Site-directed mutagenesis of ETB receptor; transient expression in COS-7 cells; radioligand displacement binding assay ([125I]ET-1); inositol phosphate accumulation assay","journal":"Journal of cardiovascular pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Strong — active-site mutagenesis with functional validation (binding + signaling), reconstituted receptor expression system","pmids":["1282984"],"is_preprint":false},{"year":1999,"finding":"Big ET-3 and big ET-1 adopt similar secondary structures and overall folds (assessed by CD spectroscopy and homology modeling), but differ in the C-terminal region (residues 34–41 in big ET-3 vs. 34–38 in big ET-1) near the cleavage site. The sequence differences in the local region around the ECE-1 cleavage site (QTVP in big ET-3 vs. HVVP in big ET-1) account for the substantially lower efficiency of ECE-1 processing of big ET-3 relative to big ET-1.","method":"Circular dichroism spectroscopy; thermal denaturation; homology modeling and structural superposition","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — structural analysis by CD and modeling, no direct mutagenesis or cleavage assay, single lab","pmids":["10026250"],"is_preprint":false},{"year":2021,"finding":"Edn3 overexpression in the skin microenvironment promotes immune evasion by melanoma tumors via EDNRB signaling: tumors in K5-Edn3 transgenic mice (keratinocyte-driven Edn3 overexpression) were larger, with higher numbers of regulatory T cells (Tregs) and dendritic cells. Edn3 directly increased Treg proliferation and FOXP3 expression in vitro. Pharmacological EDNRB blockade (BQ-788) reduced tumor growth.","method":"Transgenic K5-Edn3 mouse model; subcutaneous melanoma injection; flow cytometry for immune cell populations; in vitro Treg proliferation assay; EDNRB antagonist (BQ-788) treatment","journal":"Pigment cell & melanoma research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model + in vitro mechanistic assay + pharmacological rescue, single lab","pmids":["34288510"],"is_preprint":false},{"year":1998,"finding":"ET-3, acting via ETB receptor, inhibits estrogen and cAMP production by rat granulosa cells; this inhibitory effect is not mediated by the ETA receptor (BQ-123 had no effect), is not mediated by prostanoids (indomethacin had no effect), and ETB-selective agonist sarafotoxin-S6c mimicked the effect. ET-3 was more potent than ET-1 in suppressing estrogen production.","method":"Hormone (estrogen, cAMP) production assays in isolated rat granulosa cells; pharmacological dissection with ETA antagonist (BQ-123), ETB agonist (sarafotoxin-S6c), and indomethacin","journal":"The Journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor pharmacology with multiple agents, single lab, primary cell culture","pmids":["9659283"],"is_preprint":false},{"year":2025,"finding":"Migrating enteric neural crest cells (ENCCs) in mice exhibit endogenous EDN3/EDNRB-gated intracellular calcium activity, mediated by chloride channels, T-type Ca2+ channels (CaV3.2/CACNA1H), and IP3-sensitive intracellular Ca2+ store release. Inhibiting Ca2+ activity caused ENCC migration defects, while stimulating Ca2+ activity promoted migration by increasing ENCC contractility and traction force to the extracellular matrix.","method":"Live calcium imaging of ENCCs in mouse gut explants; pharmacological inhibition of chloride channels, T-type Ca2+ channels, and IP3 receptors; traction force microscopy; ENCC migration assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological perturbations with live imaging and functional readouts, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.10.23.684245"],"is_preprint":true},{"year":2023,"finding":"EDN3 promoter methylation silences EDN3 expression in cervical cancer; treatment with 5-Azacytidine (DNMT1 inhibitor) restored EDN3 expression. Overexpression of EDN3 in cervical cancer cell lines inhibited proliferation, clone formation, migration, and invasion.","method":"Pyrosequencing of EDN3 promoter CpG sites; 5-Azacytidine treatment in cell lines; EdU assay, wound-healing assay, clone formation, transwell invasion assay after EDN3 overexpression","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays with gain-of-function in cell lines, epigenetic mechanism confirmed by demethylating agent, single lab","pmids":["36824133"],"is_preprint":false},{"year":2019,"finding":"Chicken EDN3 peptide activates both EDNRB and EDNRB2 receptors with similar potencies, stimulating intracellular calcium, MAPK/ERK, and cAMP/PKA signaling pathways, whereas EDNRA is preferentially activated by EDN1 and EDN2 but not EDN3.","method":"Heterologous expression of chicken EDNRs in HEK293 cells; luciferase reporter assays for calcium, MAPK/ERK, and cAMP/PKA pathway activation","journal":"General and comparative endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based functional receptor assays with three orthogonal signaling readouts, single lab, avian ortholog","pmids":["31351053"],"is_preprint":false}],"current_model":"EDN3 is a secreted peptide that signals primarily through the ETB receptor (and EDNRB2 in some species) to regulate migration, proliferation, and differentiation of neural crest-derived lineages (enteric neurons and melanocytes) during development — acting to maintain precursor pools by inhibiting premature neuronal differentiation — while also mediating vasoconstriction, nitric oxide/cGMP production, MAPK/ERK signaling, and calcium-dependent contractility in various cell types; its gene is frequently silenced by promoter hypermethylation in cancers where it may act as a tumor suppressor, and in the tumor microenvironment EDN3/EDNRB signaling promotes immunosuppression via Treg expansion."},"narrative":{"mechanistic_narrative":"EDN3 (endothelin-3) is a secreted peptide ligand that signals predominantly through the ETB receptor (EDNRB) — and the EDNRB2 paralog in non-mammalian species — to govern the development of neural crest-derived lineages, including enteric neurons and melanocytes [PMID:7509343, PMID:31351053, PMID:21538684]. During enteric nervous system development, EDN3 maintains the precursor pool by inhibiting premature GDNF-driven neuronal differentiation [PMID:9578621], and it acts in a coordinate, dose-balanced interaction with Sox10 required for gut colonization by enteric crest cells and for melanocyte development, with loss of signaling causing apoptosis and impaired migration of vagal neural crest cells [PMID:16650841]. In the melanocyte lineage, EDN3/EDNRB signaling activates melanocyte stem cells to regenerate follicular and epidermal melanocytes [PMID:28779103] and drives melanoblast migration and invasion [PMID:21538684]. At the receptor level, the third transmembrane domain residue Lys-181 of ETB is critical for high-affinity EDN3 binding but dispensable for G-protein coupling [PMID:1282984], and EDN3 engages downstream effectors including intracellular Ca2+/calmodulin-dependent nitric oxide/cGMP production [PMID:7509343] and Gi/Gq-dependent MAPK/ERK activation that upregulates c-fos and c-jun [PMID:18362896]. EDN3 also functions in non-developmental contexts as a co-mitogen for vascular smooth muscle cells [PMID:2102088] and a modulator of glomerular, astroglial, and granulosa cell physiology [PMID:7509343, PMID:10516091, PMID:9659283]. The gene is silenced by promoter hypermethylation in breast and cervical carcinomas, where re-expression suppresses proliferation, migration, and invasion, consistent with a tumor-suppressor role [PMID:19527488, PMID:36824133], while EDN3 overexpression in the melanoma microenvironment promotes immune evasion via Treg expansion through EDNRB [PMID:34288510].","teleology":[{"year":1991,"claim":"Established that EDN3 is recognized by distinct endothelin receptor subtypes, distinguishing a high-affinity ET-1/ET-2-preferring site from a lower-affinity site binding all three isoforms equally — the pharmacological foundation for receptor-selective EDN3 signaling.","evidence":"Radioligand binding and dissociation kinetics in cultured rat aortic smooth muscle cells","pmids":["1725299"],"confidence":"Medium","gaps":["Did not molecularly identify the receptor genes corresponding to each binding subtype","Binding kinetics alone do not define downstream signaling consequences"]},{"year":1992,"claim":"Mapped a specific ETB receptor residue controlling EDN3 affinity, showing that ligand binding and G-protein coupling are separable functions of the receptor.","evidence":"Site-directed mutagenesis (Lys181Asp) of rat ETB expressed in COS-7 cells with binding and inositol phosphate assays","pmids":["1282984"],"confidence":"High","gaps":["Single residue tested in one receptor subtype","Does not address EDN3-specific (vs ET-1) determinants of selectivity"]},{"year":1994,"claim":"Defined a downstream signaling axis for EDN3, linking ETB activation to intracellular Ca2+/calmodulin-dependent nitric oxide and cGMP production independent of L-type Ca2+ channels.","evidence":"cGMP accumulation assays with selective agonist/antagonist and inhibitor panel in rat glomeruli and mesangial cells","pmids":["7509343"],"confidence":"High","gaps":["Tissue-restricted to renal cells","Does not connect this pathway to developmental phenotypes"]},{"year":1998,"claim":"Revealed EDN3's core developmental function: maintaining the enteric neural precursor pool by antagonizing GDNF-stimulated neuronal differentiation, with context-dependent effects on proliferation.","evidence":"In vitro culture of immunoaffinity-isolated quail enteric neural crest precursors with proliferation and neurite assays","pmids":["9578621"],"confidence":"Medium","gaps":["In vitro avian system; not validated in vivo here","Molecular mechanism of differentiation inhibition not defined"]},{"year":1999,"claim":"Demonstrated EDN3 acts through ETB-restricted signaling to inhibit astroglial gap junction communication, contrasting with ET-1's dual-receptor action.","evidence":"Dye diffusion, Ca2+ imaging and receptor-subtype pharmacology in cultured rat astrocytes","pmids":["10516091"],"confidence":"Medium","gaps":["Single cell-type model","Physiological significance in the nervous system not established"]},{"year":1999,"claim":"Explained at the structural level why big ET-3 is a poor ECE-1 substrate, attributing reduced processing efficiency to local sequence differences near the cleavage site rather than global fold differences.","evidence":"CD spectroscopy, thermal denaturation and homology modeling of big ET-3 vs big ET-1","pmids":["10026250"],"confidence":"Medium","gaps":["No direct cleavage assay or mutagenesis to test the proposed determinants","Modeling-based structural inference only"]},{"year":2006,"claim":"Placed EDN3 in a balanced genetic network with Sox10 required for enteric nervous system and melanocyte development, showing loss of signaling causes neural crest apoptosis and impaired gut colonization.","evidence":"Sox10;Edn3 and Sox10;Ednrb double-mutant mouse phenotyping with apoptosis, proliferation, and differentiation markers","pmids":["16650841"],"confidence":"High","gaps":["Genetic interaction does not specify the molecular crosstalk between EDN3 and Sox10","Does not resolve cell-autonomous vs non-autonomous contributions"]},{"year":2008,"claim":"Resolved the EDN3-to-ERK signaling cascade, showing convergence of Gi/Src and Gq/PKC inputs on Ras/Raf to drive immediate-early gene expression and cell growth.","evidence":"Pharmacological pathway dissection with MAPK phospho-blots in JAR and Jeg-3 choriocarcinoma cells","pmids":["18362896"],"confidence":"Medium","gaps":["Cancer cell line model","Relevance to normal neural crest growth not tested"]},{"year":2009,"claim":"Identified promoter hypermethylation as the predominant mechanism silencing EDN3 in breast cancer, implicating EDN3 loss in tumorigenesis.","evidence":"Methylation-specific PCR, expression analysis, and demethylating-agent rescue in breast cancer cohorts and cell lines","pmids":["19527488"],"confidence":"Medium","gaps":["Correlative epigenetic silencing; tumor-suppressor function not directly tested here","Mechanism by which EDN3 loss promotes cancer not addressed"]},{"year":2011,"claim":"Showed EDN3/EDNRB2 signaling directs melanoblast migration in vivo and enhances invasive capacity, extending the developmental role to melanocyte positioning.","evidence":"In situ hybridization, morpholino knockdown and dominant-negative perturbation plus in vitro invasion assay in Xenopus","pmids":["21538684"],"confidence":"Medium","gaps":["EDNRB2 is a non-mammalian paralog; mammalian generalization uncertain","Downstream migratory effectors not identified"]},{"year":2017,"claim":"Demonstrated that endogenous EDN3 activates melanocyte stem cells via EDNRB to regenerate melanocytes, establishing a physiological adult role in pigmentation.","evidence":"Mouse epilation model with genetic and pharmacological EDNRB blockade and melanocyte marker immunofluorescence","pmids":["28779103"],"confidence":"High","gaps":["Stem cell activation mechanism downstream of EDNRB not detailed","Source cells of EDN3 mapped but signaling kinetics not resolved"]},{"year":2019,"claim":"Clarified EDN3 receptor selectivity across endothelin receptors, showing it activates both EDNRB and EDNRB2 (but not EDNRA) to engage calcium, ERK, and cAMP/PKA pathways.","evidence":"Heterologous expression of chicken EDNRs in HEK293 cells with luciferase pathway reporters","pmids":["31351053"],"confidence":"Medium","gaps":["Avian receptors; mammalian receptor coupling may differ","Does not link individual pathways to specific biological outputs"]},{"year":2021,"claim":"Uncovered a tumor-microenvironment role in which EDN3 overexpression promotes melanoma immune evasion by expanding regulatory T cells through EDNRB.","evidence":"K5-Edn3 transgenic melanoma model, flow cytometry, in vitro Treg proliferation assay and BQ-788 EDNRB blockade","pmids":["34288510"],"confidence":"Medium","gaps":["Treg expansion mechanism downstream of EDNRB not defined","Direct vs indirect effects on dendritic cells not separated"]},{"year":2023,"claim":"Extended the epigenetic-silencing/tumor-suppressor model to cervical cancer, showing EDN3 re-expression suppresses proliferation, migration, and invasion.","evidence":"Pyrosequencing, 5-Azacytidine treatment, and gain-of-function functional assays in cervical cancer cell lines","pmids":["36824133"],"confidence":"Medium","gaps":["Mechanism of growth suppression by EDN3 not defined","In vitro cell lines only; no in vivo tumor model"]},{"year":2025,"claim":"Connected EDN3/EDNRB signaling to a cellular mechanism for migration, showing it gates intracellular calcium activity that controls enteric neural crest cell contractility and traction force.","evidence":"Live calcium imaging in mouse gut explants with channel/IP3R inhibitors and traction force microscopy (preprint)","pmids":["bio_10.1101_2025.10.23.684245"],"confidence":"Medium","gaps":["Preprint not yet peer-reviewed","Links between EDNRB and the specific ion channels not molecularly established"]},{"year":null,"claim":"How EDN3/EDNRB signaling outputs (Ca2+, ERK, cAMP, NO/cGMP) are selectively coupled to distinct biological outcomes — precursor maintenance versus migration versus immune modulation — and the molecular basis of EDN3's tumor-suppressor activity remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified model linking pathway choice to cellular outcome","Tumor-suppressor mechanism of EDN3 undefined","Direct molecular crosstalk with Sox10 not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[3,10,16]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,6,16]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[5,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,6,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,2,5,8]}],"complexes":[],"partners":["EDNRB","EDNRB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P14138","full_name":"Endothelin-3","aliases":["Preproendothelin-3","PPET3"],"length_aa":238,"mass_kda":25.5,"function":"Endothelins are endothelium-derived vasoconstrictor peptides","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P14138/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EDN3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EDN3","total_profiled":1310},"omim":[{"mim_id":"613870","title":"HIRSCHSPRUNG DISEASE, CARDIAC DEFECTS, AND AUTONOMIC DYSFUNCTION; HCAD","url":"https://www.omim.org/entry/613870"},{"mim_id":"613712","title":"HIRSCHSPRUNG DISEASE, SUSCEPTIBILITY TO, 4; HSCR4","url":"https://www.omim.org/entry/613712"},{"mim_id":"613265","title":"WAARDENBURG SYNDROME, TYPE 4B; WS4B","url":"https://www.omim.org/entry/613265"},{"mim_id":"610046","title":"LAEVERIN; LVRN","url":"https://www.omim.org/entry/610046"},{"mim_id":"606897","title":"LYSOSOMAL TRAFFICKING REGULATOR; LYST","url":"https://www.omim.org/entry/606897"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"cervix","ntpm":47.1},{"tissue":"pituitary gland","ntpm":45.8},{"tissue":"salivary gland","ntpm":64.3},{"tissue":"vagina","ntpm":102.4}],"url":"https://www.proteinatlas.org/search/EDN3"},"hgnc":{"alias_symbol":["ET3"],"prev_symbol":[]},"alphafold":{"accession":"P14138","domains":[{"cath_id":"-","chopping":"95-122","consensus_level":"medium","plddt":74.7396,"start":95,"end":122}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P14138","model_url":"https://alphafold.ebi.ac.uk/files/AF-P14138-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P14138-F1-predicted_aligned_error_v6.png","plddt_mean":55.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EDN3","jax_strain_url":"https://www.jax.org/strain/search?query=EDN3"},"sequence":{"accession":"P14138","fasta_url":"https://rest.uniprot.org/uniprotkb/P14138.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P14138/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P14138"}},"corpus_meta":[{"pmid":"9578621","id":"PMC_9578621","title":"GDNF and ET-3 differentially modulate the numbers of avian enteric neural crest cells and enteric neurons in vitro.","date":"1998","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/9578621","citation_count":190,"is_preprint":false},{"pmid":"2102088","id":"PMC_2102088","title":"The endothelin peptides ET-1, ET-2, ET-3 and sarafotoxin S6b are co-mitogenic with platelet-derived growth factor for vascular smooth muscle cells.","date":"1990","source":"Atherosclerosis","url":"https://pubmed.ncbi.nlm.nih.gov/2102088","citation_count":126,"is_preprint":false},{"pmid":"16650841","id":"PMC_16650841","title":"Interactions between Sox10, Edn3 and Ednrb during enteric nervous system and melanocyte development.","date":"2006","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/16650841","citation_count":105,"is_preprint":false},{"pmid":"2018043","id":"PMC_2018043","title":"Chromosomal assignments of the human endothelin family genes: the endothelin-1 gene (EDN1) to 6p23-p24, the endothelin-2 gene (EDN2) to 1p34, and the endothelin-3 gene (EDN3) to 20q13.2-q13.3.","date":"1991","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/2018043","citation_count":94,"is_preprint":false},{"pmid":"11434563","id":"PMC_11434563","title":"EDNRB/EDN3 and Hirschsprung disease type II.","date":"2001","source":"Pigment cell research","url":"https://pubmed.ncbi.nlm.nih.gov/11434563","citation_count":80,"is_preprint":false},{"pmid":"7509343","id":"PMC_7509343","title":"Endothelin (ET)-3 stimulates cyclic guanosine 3',5'-monophosphate production via ETB receptor by producing nitric oxide in isolated rat glomerulus, and in cultured rat mesangial cells.","date":"1994","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/7509343","citation_count":77,"is_preprint":false},{"pmid":"10516091","id":"PMC_10516091","title":"Distinct pharmacological properties of ET-1 and ET-3 on astroglial gap junctions and 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At low cell density or in defined medium, ET-3 reduced cell proliferation; at high density with serum, ET-3 and GDNF had an additive proliferative effect.\",\n      \"method\": \"In vitro culture of HNK-1-immunoaffinity-isolated enteric neural crest precursors from quail embryos; cell counting, neurite quantification, proliferation assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean in vitro functional assay with isolated precursor cells, multiple conditions tested, single lab\",\n      \"pmids\": [\"9578621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ET-3 (along with ET-1 and ET-2) functions as a co-mitogen for rat vascular smooth muscle cells, potentiating DNA synthesis induced by PDGF but unable to initiate DNA synthesis alone. ET-3 was less potent than ET-1 and ET-2 in this co-mitogenic effect.\",\n      \"method\": \"BrdU incorporation assay in cultured rat vascular smooth muscle cells; image analysis of stained nuclei\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro functional assay with quantitative readout, single lab, single method\",\n      \"pmids\": [\"2102088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Genetic epistasis experiments in Sox10;Edn3 double mutant mice demonstrate that Edn3 and Sox10 act in a coordinate and balanced interaction required for normal enteric nervous system (ENS) and melanocyte development. Partial loss of Ednrb in Sox10 heterozygous mice impairs gut colonization by enteric crest cells at all stages, and increased apoptosis was found in vagal neural crest cells outside the gut in double mutants.\",\n      \"method\": \"Double mutant mouse phenotype analysis (Sox10;Edn3 and Sox10;Ednrb); immunohistochemistry for apoptosis, cell proliferation, neuronal/glial differentiation markers in neural crest cells\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double mutants, multiple orthogonal readouts (apoptosis, proliferation, differentiation, migration), replicates single-mutant findings\",\n      \"pmids\": [\"16650841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"ET-3 stimulates cGMP production in rat glomeruli and cultured mesangial cells via ETB receptor activation, with the mechanism dependent on intracellular Ca2+/calmodulin-mediated nitric oxide (NO) production; L-type Ca2+ channel influx was not required.\",\n      \"method\": \"cGMP accumulation assays in isolated rat glomerulus and cultured mesangial cells; pharmacological dissection using ETB agonist (IRL 1620), ETA antagonist (BQ123), NOS inhibitor (L-NMMA), BAPTA/AM, W-7, nicardipine\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro receptor pharmacology with reconstitution-level specificity, multiple inhibitors confirming mechanism, two cell systems tested\",\n      \"pmids\": [\"7509343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ET-3 inhibits astroglial gap junction permeability and intercellular Ca2+ signaling exclusively via ETB receptors (effects blocked by ETB antagonist, not ETA antagonist), whereas ET-1 inhibits these same processes via both ETA and ETB receptors. ET-3 and ET-1 also induce intracellular Ca2+ increases in astrocytes with distinct response patterns depending on receptor subtype.\",\n      \"method\": \"Dye diffusion assays for gap junction permeability, intracellular Ca2+ imaging, pharmacological receptor subtype dissection with selective antagonists; cultured rat hippocampal and striatal astrocytes\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays, receptor pharmacology, single lab\",\n      \"pmids\": [\"10516091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Epilation triggers upregulation of endogenous EDN3 in dermal papilla, secondary hair germ cells, and epidermis, which activates melanocyte stem cells (McSCs) via EDNRB signaling to regenerate follicular and epidermal melanocytes, causing skin and hair hyperpigmentation. Genetic and pharmacological blockade of EDNRB significantly inhibited McSC activation and hyperpigmentation after epilation.\",\n      \"method\": \"Mouse epilation model; transgenic and pharmacological (EDNRB inhibitor) disruption of EDNRB in vivo; immunofluorescence for melanocyte markers\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function (genetic knockout + pharmacological) with specific phenotypic readout, two orthogonal approaches converging on same mechanism\",\n      \"pmids\": [\"28779103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ET-3 (and ET-1), acting via ETB receptors on human choriocarcinoma cells, activates p42/44 MAPK (ERK1/2) through Gi- and Gq-dependent pathways involving Src (downstream of Gi) and PKC (downstream of Gq) converging at Ras/Raf. This leads to transcriptional upregulation of c-fos and c-jun and increased cell growth.\",\n      \"method\": \"Western blot for MAPK phosphorylation; pharmacological inhibition of Gi, Gq, Src, PKC, Ras/Raf in JAR and Jeg-3 choriocarcinoma cell lines; receptor expression confirmed by RT-PCR\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological dissection steps with defined pathway readouts, single lab, cell line model\",\n      \"pmids\": [\"18362896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"EDN3 promoter hypermethylation (detected in 70% of primary breast carcinomas) is the predominant mechanism silencing EDN3 gene expression in breast cancer; treatment with 5-aza-2'-deoxycytidine and trichostatin A restored EDN3 mRNA expression in breast cancer cell lines in vitro.\",\n      \"method\": \"Methylation-specific PCR, Northern blot, real-time PCR, tissue microarray; demethylating agent treatment (5-aza-2'-deoxycytidine + trichostatin A) in breast cancer cell lines\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — methylation-specific PCR validated by functional reversal with demethylating agents, multiple patient cohorts, single lab\",\n      \"pmids\": [\"19527488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ET3/Ednrb2 signaling is required for melanoblast migration in Xenopus laevis: Ednrb2 is expressed by melanoblasts from pre-migratory stages, ET3 is expressed near melanoblast destinations, and aberrant ET3/Ednrb2 signaling disrupts melanoblast migration in vivo while ET3 enhances melanoblast invasive ability in vitro.\",\n      \"method\": \"In situ hybridization for Ednrb2 and ET3 expression; in vivo morpholino-mediated knockdown and dominant-negative approaches; in vitro invasion assay with ET3\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function plus in vitro gain-of-function, multiple readouts, single lab\",\n      \"pmids\": [\"21538684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ET-3 binds to two distinct receptor subtypes on rat aortic smooth muscle cells: a high-affinity ET-1/ET-2-preferring receptor (80–85% of sites, irreversible binding, subject to downregulation) and a lower-affinity subtype (15–20%) that binds all three ET isoforms with equal affinity in a reversible manner and is insensitive to downregulation.\",\n      \"method\": \"Radioligand binding assay ([125I]ET-1, [125I]ET-2, [125I]ET-3) with competition and dissociation kinetics; downregulation by pre-exposure to ET isoforms in cultured rat aortic smooth muscle cells\",\n      \"journal\": \"Journal of cardiovascular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple radioligand binding assays with kinetic and competition analyses, single lab\",\n      \"pmids\": [\"1725299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Substitution of lysine-181 to aspartic acid in the third transmembrane domain of the rat ETB receptor selectively reduces high-affinity binding of ET-3 (IC50 increases ~200-fold), while still permitting full inositol phosphate signaling at saturating ET-3 concentrations, indicating this residue is critical for ligand affinity but not G-protein coupling.\",\n      \"method\": \"Site-directed mutagenesis of ETB receptor; transient expression in COS-7 cells; radioligand displacement binding assay ([125I]ET-1); inositol phosphate accumulation assay\",\n      \"journal\": \"Journal of cardiovascular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — active-site mutagenesis with functional validation (binding + signaling), reconstituted receptor expression system\",\n      \"pmids\": [\"1282984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Big ET-3 and big ET-1 adopt similar secondary structures and overall folds (assessed by CD spectroscopy and homology modeling), but differ in the C-terminal region (residues 34–41 in big ET-3 vs. 34–38 in big ET-1) near the cleavage site. The sequence differences in the local region around the ECE-1 cleavage site (QTVP in big ET-3 vs. HVVP in big ET-1) account for the substantially lower efficiency of ECE-1 processing of big ET-3 relative to big ET-1.\",\n      \"method\": \"Circular dichroism spectroscopy; thermal denaturation; homology modeling and structural superposition\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — structural analysis by CD and modeling, no direct mutagenesis or cleavage assay, single lab\",\n      \"pmids\": [\"10026250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Edn3 overexpression in the skin microenvironment promotes immune evasion by melanoma tumors via EDNRB signaling: tumors in K5-Edn3 transgenic mice (keratinocyte-driven Edn3 overexpression) were larger, with higher numbers of regulatory T cells (Tregs) and dendritic cells. Edn3 directly increased Treg proliferation and FOXP3 expression in vitro. Pharmacological EDNRB blockade (BQ-788) reduced tumor growth.\",\n      \"method\": \"Transgenic K5-Edn3 mouse model; subcutaneous melanoma injection; flow cytometry for immune cell populations; in vitro Treg proliferation assay; EDNRB antagonist (BQ-788) treatment\",\n      \"journal\": \"Pigment cell & melanoma research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model + in vitro mechanistic assay + pharmacological rescue, single lab\",\n      \"pmids\": [\"34288510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ET-3, acting via ETB receptor, inhibits estrogen and cAMP production by rat granulosa cells; this inhibitory effect is not mediated by the ETA receptor (BQ-123 had no effect), is not mediated by prostanoids (indomethacin had no effect), and ETB-selective agonist sarafotoxin-S6c mimicked the effect. ET-3 was more potent than ET-1 in suppressing estrogen production.\",\n      \"method\": \"Hormone (estrogen, cAMP) production assays in isolated rat granulosa cells; pharmacological dissection with ETA antagonist (BQ-123), ETB agonist (sarafotoxin-S6c), and indomethacin\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor pharmacology with multiple agents, single lab, primary cell culture\",\n      \"pmids\": [\"9659283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Migrating enteric neural crest cells (ENCCs) in mice exhibit endogenous EDN3/EDNRB-gated intracellular calcium activity, mediated by chloride channels, T-type Ca2+ channels (CaV3.2/CACNA1H), and IP3-sensitive intracellular Ca2+ store release. Inhibiting Ca2+ activity caused ENCC migration defects, while stimulating Ca2+ activity promoted migration by increasing ENCC contractility and traction force to the extracellular matrix.\",\n      \"method\": \"Live calcium imaging of ENCCs in mouse gut explants; pharmacological inhibition of chloride channels, T-type Ca2+ channels, and IP3 receptors; traction force microscopy; ENCC migration assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological perturbations with live imaging and functional readouts, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.23.684245\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EDN3 promoter methylation silences EDN3 expression in cervical cancer; treatment with 5-Azacytidine (DNMT1 inhibitor) restored EDN3 expression. Overexpression of EDN3 in cervical cancer cell lines inhibited proliferation, clone formation, migration, and invasion.\",\n      \"method\": \"Pyrosequencing of EDN3 promoter CpG sites; 5-Azacytidine treatment in cell lines; EdU assay, wound-healing assay, clone formation, transwell invasion assay after EDN3 overexpression\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays with gain-of-function in cell lines, epigenetic mechanism confirmed by demethylating agent, single lab\",\n      \"pmids\": [\"36824133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Chicken EDN3 peptide activates both EDNRB and EDNRB2 receptors with similar potencies, stimulating intracellular calcium, MAPK/ERK, and cAMP/PKA signaling pathways, whereas EDNRA is preferentially activated by EDN1 and EDN2 but not EDN3.\",\n      \"method\": \"Heterologous expression of chicken EDNRs in HEK293 cells; luciferase reporter assays for calcium, MAPK/ERK, and cAMP/PKA pathway activation\",\n      \"journal\": \"General and comparative endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based functional receptor assays with three orthogonal signaling readouts, single lab, avian ortholog\",\n      \"pmids\": [\"31351053\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EDN3 is a secreted peptide that signals primarily through the ETB receptor (and EDNRB2 in some species) to regulate migration, proliferation, and differentiation of neural crest-derived lineages (enteric neurons and melanocytes) during development — acting to maintain precursor pools by inhibiting premature neuronal differentiation — while also mediating vasoconstriction, nitric oxide/cGMP production, MAPK/ERK signaling, and calcium-dependent contractility in various cell types; its gene is frequently silenced by promoter hypermethylation in cancers where it may act as a tumor suppressor, and in the tumor microenvironment EDN3/EDNRB signaling promotes immunosuppression via Treg expansion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EDN3 (endothelin-3) is a secreted peptide ligand that signals predominantly through the ETB receptor (EDNRB) — and the EDNRB2 paralog in non-mammalian species — to govern the development of neural crest-derived lineages, including enteric neurons and melanocytes [#3, #16, #8]. During enteric nervous system development, EDN3 maintains the precursor pool by inhibiting premature GDNF-driven neuronal differentiation [#0], and it acts in a coordinate, dose-balanced interaction with Sox10 required for gut colonization by enteric crest cells and for melanocyte development, with loss of signaling causing apoptosis and impaired migration of vagal neural crest cells [#2]. In the melanocyte lineage, EDN3/EDNRB signaling activates melanocyte stem cells to regenerate follicular and epidermal melanocytes [#5] and drives melanoblast migration and invasion [#8]. At the receptor level, the third transmembrane domain residue Lys-181 of ETB is critical for high-affinity EDN3 binding but dispensable for G-protein coupling [#10], and EDN3 engages downstream effectors including intracellular Ca2+/calmodulin-dependent nitric oxide/cGMP production [#3] and Gi/Gq-dependent MAPK/ERK activation that upregulates c-fos and c-jun [#6]. EDN3 also functions in non-developmental contexts as a co-mitogen for vascular smooth muscle cells [#1] and a modulator of glomerular, astroglial, and granulosa cell physiology [#3, #4, #13]. The gene is silenced by promoter hypermethylation in breast and cervical carcinomas, where re-expression suppresses proliferation, migration, and invasion, consistent with a tumor-suppressor role [#7, #15], while EDN3 overexpression in the melanoma microenvironment promotes immune evasion via Treg expansion through EDNRB [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established that EDN3 is recognized by distinct endothelin receptor subtypes, distinguishing a high-affinity ET-1/ET-2-preferring site from a lower-affinity site binding all three isoforms equally — the pharmacological foundation for receptor-selective EDN3 signaling.\",\n      \"evidence\": \"Radioligand binding and dissociation kinetics in cultured rat aortic smooth muscle cells\",\n      \"pmids\": [\"1725299\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not molecularly identify the receptor genes corresponding to each binding subtype\", \"Binding kinetics alone do not define downstream signaling consequences\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapped a specific ETB receptor residue controlling EDN3 affinity, showing that ligand binding and G-protein coupling are separable functions of the receptor.\",\n      \"evidence\": \"Site-directed mutagenesis (Lys181Asp) of rat ETB expressed in COS-7 cells with binding and inositol phosphate assays\",\n      \"pmids\": [\"1282984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single residue tested in one receptor subtype\", \"Does not address EDN3-specific (vs ET-1) determinants of selectivity\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Defined a downstream signaling axis for EDN3, linking ETB activation to intracellular Ca2+/calmodulin-dependent nitric oxide and cGMP production independent of L-type Ca2+ channels.\",\n      \"evidence\": \"cGMP accumulation assays with selective agonist/antagonist and inhibitor panel in rat glomeruli and mesangial cells\",\n      \"pmids\": [\"7509343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-restricted to renal cells\", \"Does not connect this pathway to developmental phenotypes\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Revealed EDN3's core developmental function: maintaining the enteric neural precursor pool by antagonizing GDNF-stimulated neuronal differentiation, with context-dependent effects on proliferation.\",\n      \"evidence\": \"In vitro culture of immunoaffinity-isolated quail enteric neural crest precursors with proliferation and neurite assays\",\n      \"pmids\": [\"9578621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro avian system; not validated in vivo here\", \"Molecular mechanism of differentiation inhibition not defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated EDN3 acts through ETB-restricted signaling to inhibit astroglial gap junction communication, contrasting with ET-1's dual-receptor action.\",\n      \"evidence\": \"Dye diffusion, Ca2+ imaging and receptor-subtype pharmacology in cultured rat astrocytes\",\n      \"pmids\": [\"10516091\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell-type model\", \"Physiological significance in the nervous system not established\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Explained at the structural level why big ET-3 is a poor ECE-1 substrate, attributing reduced processing efficiency to local sequence differences near the cleavage site rather than global fold differences.\",\n      \"evidence\": \"CD spectroscopy, thermal denaturation and homology modeling of big ET-3 vs big ET-1\",\n      \"pmids\": [\"10026250\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct cleavage assay or mutagenesis to test the proposed determinants\", \"Modeling-based structural inference only\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed EDN3 in a balanced genetic network with Sox10 required for enteric nervous system and melanocyte development, showing loss of signaling causes neural crest apoptosis and impaired gut colonization.\",\n      \"evidence\": \"Sox10;Edn3 and Sox10;Ednrb double-mutant mouse phenotyping with apoptosis, proliferation, and differentiation markers\",\n      \"pmids\": [\"16650841\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genetic interaction does not specify the molecular crosstalk between EDN3 and Sox10\", \"Does not resolve cell-autonomous vs non-autonomous contributions\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the EDN3-to-ERK signaling cascade, showing convergence of Gi/Src and Gq/PKC inputs on Ras/Raf to drive immediate-early gene expression and cell growth.\",\n      \"evidence\": \"Pharmacological pathway dissection with MAPK phospho-blots in JAR and Jeg-3 choriocarcinoma cells\",\n      \"pmids\": [\"18362896\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cancer cell line model\", \"Relevance to normal neural crest growth not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified promoter hypermethylation as the predominant mechanism silencing EDN3 in breast cancer, implicating EDN3 loss in tumorigenesis.\",\n      \"evidence\": \"Methylation-specific PCR, expression analysis, and demethylating-agent rescue in breast cancer cohorts and cell lines\",\n      \"pmids\": [\"19527488\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative epigenetic silencing; tumor-suppressor function not directly tested here\", \"Mechanism by which EDN3 loss promotes cancer not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed EDN3/EDNRB2 signaling directs melanoblast migration in vivo and enhances invasive capacity, extending the developmental role to melanocyte positioning.\",\n      \"evidence\": \"In situ hybridization, morpholino knockdown and dominant-negative perturbation plus in vitro invasion assay in Xenopus\",\n      \"pmids\": [\"21538684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EDNRB2 is a non-mammalian paralog; mammalian generalization uncertain\", \"Downstream migratory effectors not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated that endogenous EDN3 activates melanocyte stem cells via EDNRB to regenerate melanocytes, establishing a physiological adult role in pigmentation.\",\n      \"evidence\": \"Mouse epilation model with genetic and pharmacological EDNRB blockade and melanocyte marker immunofluorescence\",\n      \"pmids\": [\"28779103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stem cell activation mechanism downstream of EDNRB not detailed\", \"Source cells of EDN3 mapped but signaling kinetics not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Clarified EDN3 receptor selectivity across endothelin receptors, showing it activates both EDNRB and EDNRB2 (but not EDNRA) to engage calcium, ERK, and cAMP/PKA pathways.\",\n      \"evidence\": \"Heterologous expression of chicken EDNRs in HEK293 cells with luciferase pathway reporters\",\n      \"pmids\": [\"31351053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Avian receptors; mammalian receptor coupling may differ\", \"Does not link individual pathways to specific biological outputs\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Uncovered a tumor-microenvironment role in which EDN3 overexpression promotes melanoma immune evasion by expanding regulatory T cells through EDNRB.\",\n      \"evidence\": \"K5-Edn3 transgenic melanoma model, flow cytometry, in vitro Treg proliferation assay and BQ-788 EDNRB blockade\",\n      \"pmids\": [\"34288510\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Treg expansion mechanism downstream of EDNRB not defined\", \"Direct vs indirect effects on dendritic cells not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended the epigenetic-silencing/tumor-suppressor model to cervical cancer, showing EDN3 re-expression suppresses proliferation, migration, and invasion.\",\n      \"evidence\": \"Pyrosequencing, 5-Azacytidine treatment, and gain-of-function functional assays in cervical cancer cell lines\",\n      \"pmids\": [\"36824133\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of growth suppression by EDN3 not defined\", \"In vitro cell lines only; no in vivo tumor model\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected EDN3/EDNRB signaling to a cellular mechanism for migration, showing it gates intracellular calcium activity that controls enteric neural crest cell contractility and traction force.\",\n      \"evidence\": \"Live calcium imaging in mouse gut explants with channel/IP3R inhibitors and traction force microscopy (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.10.23.684245\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"Links between EDNRB and the specific ion channels not molecularly established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EDN3/EDNRB signaling outputs (Ca2+, ERK, cAMP, NO/cGMP) are selectively coupled to distinct biological outcomes — precursor maintenance versus migration versus immune modulation — and the molecular basis of EDN3's tumor-suppressor activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model linking pathway choice to cellular outcome\", \"Tumor-suppressor mechanism of EDN3 undefined\", \"Direct molecular crosstalk with Sox10 not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [3, 10, 16]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 6, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [5, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 6, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 2, 5, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"EDNRB\", \"EDNRB2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":6,"faith_total":6,"faith_pct":100.0}}