{"gene":"EDN1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2009,"finding":"Ethanol-induced ET-1 expression in liver sinusoidal endothelial cells involves NADPH oxidase activation and HIF-1α binding to hypoxia response elements in the ET-1 proximal promoter, as demonstrated by promoter analysis and chromatin immunoprecipitation. miR-199 negatively regulates HIF-1α and ET-1 expression; anti-miR-199 reverses this suppression.","method":"Chromatin immunoprecipitation, promoter analysis, miRNA transfection/antagonism","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and promoter analysis with miRNA gain/loss-of-function, single lab","pmids":["19783678"],"is_preprint":false},{"year":2007,"finding":"TGF-β induces ET-1 expression in endothelial cells preferentially through the ALK5/Smad3 pathway; specific ALK5 inhibition blocked this induction. ET-1 acts in an autocrine manner to mediate a significant portion of TGF-β's anti-migratory and anti-proliferative effects on endothelial cells, as shown by ET receptor antagonism partially reverting TGF-β effects.","method":"Pharmacological inhibition of ALK5, ET receptor antagonism, migration/proliferation assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal pharmacological approaches in endothelial cells, single lab","pmids":["17376964"],"is_preprint":false},{"year":2005,"finding":"ET-1 induces collagen I synthesis in human dermal fibroblasts via ETA receptor signaling through Gαi, phosphatidylcholine-phospholipase C (PC-PLC), and phospholipase D (PLD), but not phospholipase Cβ. Prolonged ET-1 stimulation causes a switch in receptor subtype expression from ETA to ETB and biphasic induction of connective tissue growth factor (CTGF).","method":"Pharmacological inhibition of G-proteins and phospholipases, Western blot, RT-PCR","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors, receptor subtype characterization, single lab","pmids":["16336267"],"is_preprint":false},{"year":2003,"finding":"ET-1 stimulates Ca²⁺ mobilization in human brain capillary endothelial cells via G-protein/IP3 pathway; this is dose-dependently inhibited by NO via a guanylyl cyclase/PKG-dependent mechanism. cGMP-dependent protein kinase was shown to colocalize with actin, and NO/cGMP reduced Ca²⁺ mobilization induced by thapsigargin and IP3, with associated alterations in actin/vimentin cytoskeleton.","method":"Ca²⁺ imaging, pharmacological inhibitors, immunolocalization","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological approaches with functional Ca²⁺ readout and cytoskeletal analysis, single lab","pmids":["12529247"],"is_preprint":false},{"year":1998,"finding":"ET-1 induces ets-1 mRNA expression in vascular smooth muscle cells via a PKC-dependent, intracellular Ca²⁺-dependent pathway. Inhibition of PKC (H-7) or chelation of intracellular Ca²⁺ blocked ET-1-induced ets-1 expression. ET-1-induced ets-1 activation subsequently drives collagenase I mRNA expression.","method":"RT-PCR, pharmacological inhibition of PKC and Ca²⁺ chelation, cycloheximide superinduction","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors with mRNA readout, pathway ordering established, single lab","pmids":["9486138"],"is_preprint":false},{"year":2009,"finding":"Aldosterone transcriptionally induces ET-1 (edn1) gene expression in renal collecting duct cells via mineralocorticoid receptor and glucocorticoid receptor binding to hormone response elements in the edn1 promoter. This was demonstrated by ChIP showing nuclear translocation and promoter binding of both receptors, histone modification, and RNA polymerase II recruitment. siRNA knockdown of both receptors corroborated pharmacological studies.","method":"Chromatin immunoprecipitation, siRNA knockdown, nuclear translocation assay, hnRNA measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ChIP, siRNA, and promoter occupancy with multiple orthogonal methods demonstrating direct transcriptional regulation","pmids":["19638349"],"is_preprint":false},{"year":2008,"finding":"DHEA stimulates phosphorylation and nuclear exclusion of FoxO1 in endothelial cells via PI3-kinase- and PKA-dependent pathways. A constitutively nuclear FoxO1 mutant transactivates the ET-1 promoter; DHEA inhibits this transactivation. PI3K blockade augments ET-1 promoter activity and secretion, while MAPK blockade inhibits them, establishing a balance between PI3K-dependent inhibition and MAPK-dependent stimulation of ET-1 secretion.","method":"ET-1 promoter luciferase reporter, siRNA knockdown of PKA, wortmannin/H89 inhibition, DHEA treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — promoter reporter assay, siRNA, and pharmacological inhibitors in endothelial cells, single lab","pmids":["18718910"],"is_preprint":false},{"year":2010,"finding":"ET-1 augments vascular O-GlcNAcylation in smooth muscle cells via ETA receptor activation, and this O-GlcNAcylation contributes to increased vascular contractile responses by activating the RhoA/Rho-kinase pathway including phosphorylation of MYPT-1, PKC-potentiated phosphatase inhibitor-17, MLC, and upregulation of RhoGEFs. OGT siRNA or OGT inhibitor abolished ET-1-induced O-GlcNAcylation and RhoA activation.","method":"OGT siRNA transfection, OGT inhibitor, vascular contraction assay, Western blot for RhoA pathway components","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown and pharmacological inhibition with multiple downstream readouts, single lab","pmids":["20978008"],"is_preprint":false},{"year":1992,"finding":"Both ET-1 and human big-ET-1 release prostacyclin (PGI₂) in rat perfused lungs via selective activation of ET1 (ETA) receptors, as demonstrated by blockade with the selective ETA antagonist BQ-123.","method":"Rat perfused lung preparation, selective ETA receptor antagonist BQ-123, radioligand binding","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ex vivo organ preparation with selective receptor antagonism, single lab","pmids":["1324048"],"is_preprint":false},{"year":2003,"finding":"ET-1 induces cortical spreading depression via ETA receptor and phospholipase C (PLC) activation, but not ETB receptor activation. ETA antagonist BQ-123 completely blocked ET-1-induced CSDs; ETB antagonist BQ-788 had no effect. PLC antagonist U-73122 inhibited CSD; PKC inhibitor Gö-6983 did not.","method":"In vivo cortical spreading depression model, selective receptor antagonists, PLC/PKC inhibitors","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo pharmacological dissection with selective antagonists, single lab","pmids":["14656702"],"is_preprint":false},{"year":2003,"finding":"ET-1 regulates COX-2 expression (but not COX-1) in peripheral lung vascular smooth muscle cells via ETA receptor activation and phosphorylation of p38 and p44/42 MAPK. ET-1 also stimulates its own synthesis (ppET-1 expression) via both ETA and ETB receptors. ET-1 signaling increases prostacyclin and PGE₂ release.","method":"ET receptor antagonists (BQ-610, BQ-788), MAPK inhibitors (SB-203580, PD-98056), RT-PCR, Western blot, ELISA, GC-MS","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological antagonists with mechanistic pathway ordering, single lab","pmids":["12618423"],"is_preprint":false},{"year":1990,"finding":"ET-1 receptor down-regulation in C-6 glioma cells occurs via increased endocytosis of the hormone-receptor complex and decreased receptor insertion into the plasma membrane. PKC activation by PMA causes a similar down-regulation by the same mechanism. ET-1-mediated down-regulation does not involve PKC. A 66 kDa protein was identified as the ET-1 receptor by crosslinking.","method":"Radioligand binding, internalization kinetics modeling, chemical crosslinking/SDS-PAGE, PKC inhibition","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative binding assay with kinetic modeling and crosslinking, single lab","pmids":["2161363"],"is_preprint":false},{"year":2008,"finding":"Activation of ETB receptors by extracellular ET-1 reduces ET-1 mRNA abundance in porcine aortic endothelial cells by simultaneously decreasing ET-1 mRNA stability and transiently increasing RNA Pol II loading at the ET-1 promoter. This feedback involves receptor endocytosis and both ERK and p38 MAPK pathways: p38 MAPK inhibition prevented ET-1-induced decrease in ET-1 mRNA; ERK1/2 inhibition increased ET-1 mRNA. ETA antagonism had no effect.","method":"mRNA stability assay, promoter activity (RNA Pol II ChIP), MAPK inhibitors, selective ET receptor antagonists","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (mRNA stability, ChIP, pharmacological), single lab","pmids":["18278064"],"is_preprint":false},{"year":2003,"finding":"ET-1-induced contraction of rabbit basilar artery proceeds via three signaling pathways: (1) Src-JAK2-PTK-MAPK, (2) PI3K-RhoA-Rho kinase-MLC phosphorylation, and (3) PKC, all acting through the ETA receptor. MAPK is downstream of PTK, Src, and JAK pathways; PI3K is upstream of RhoA activation; Rho kinase inhibition reduces MLC phosphorylation and contraction.","method":"Isometric tension measurement, Western blot for MAPK/RhoA, pharmacological inhibitors (PD98059, U0126, genistein, damnacanthal, AG-490, wortmannin, Y-27632)","journal":"Journal of cardiovascular pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors with functional contraction and phosphorylation readouts, single lab","pmids":["15838290"],"is_preprint":false},{"year":2012,"finding":"Following chronic hypoxia, ET-1-induced Ca²⁺ increase in pulmonary arterial smooth muscle cells occurs via voltage-dependent Ca²⁺ channels (VDCC) activated primarily by PKC, tyrosine kinases, and Rho kinase (>70% reduction by their respective inhibitors), rather than by K⁺ channel inhibition-mediated depolarization that is lost after chronic hypoxia.","method":"Fura-2 Ca²⁺ imaging, PKC inhibitors (staurosporine, GF109203X), Rho kinase inhibitors (Y-27632, HA1077), tyrosine kinase inhibitors","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Ca²⁺ imaging with multiple selective kinase inhibitors, single lab","pmids":["22387294"],"is_preprint":false},{"year":2003,"finding":"ET-1 activates RhoA-Rho kinase pathway to potentiate synergistic vasoconstriction with phenylephrine in rat corpus cavernosum. ETA receptor blockade reversed the augmented contraction, and Rho kinase inhibitor Y-27632 dose-dependently relaxed tissue. The combined ET-1+PE stimulus produced a fourfold increase of RhoA in membrane fractions compared to either agonist alone.","method":"Isolated tissue contraction assay, Western blot for RhoA membrane translocation, ETA receptor antagonist (A-127722), Rho kinase inhibitor (Y-27632)","journal":"American journal of physiology. Regulatory, integrative and comparative physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ex vivo contraction assay with selective receptor blockade and Rho kinase inhibition, Western blot for RhoA, single lab","pmids":["12893655"],"is_preprint":false},{"year":2007,"finding":"The transmembrane segment 1 (amino acids 93-131) of the human endothelin B receptor is a central region required for both ET-1 binding and homodimer (homo-oligomer) formation, as demonstrated by systematic deletion analysis of cell-free produced ETB receptor fragments in pulldown, coelution, and surface plasmon resonance assays.","method":"Cell-free expression, pulldown assay, coelution, surface plasmon resonance, single-particle analysis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple binding assays and deletion mutagenesis, single lab","pmids":["17535295"],"is_preprint":false},{"year":2004,"finding":"Exogenous ET-1 infusion in portal hypertensive (PVL) rats increases TNF-α levels and triggers the full hepatopulmonary syndrome (HPS) including pulmonary microvascular changes, establishing that ET-1 is upstream of TNF-α in triggering HPS. Biliary cirrhosis uniquely produces both elevated ET-1 and TNF-α, which together induce HPS.","method":"Rat models (CBDL, PVL, TAA), ET-1 infusion, molecular and physiological evaluation of HPS markers","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ET-1 infusion with molecular phenotyping establishing pathway ordering, single lab","pmids":["14715521"],"is_preprint":false},{"year":2019,"finding":"ET-1 sensitizes TRPA1 channels in primary sensory neurons via the ETA receptor and protein kinase A (PKA) pathway, contributing to mechanical hyperalgesia. ETAR was shown to colocalize with TRPA1 in DRG neurons; pharmacological blocking of ETAR, PKA, or TRPA1 attenuated ET-1-induced mechanical hyperalgesia in vivo.","method":"Ca²⁺ imaging, electrophysiology, immunostaining, pharmacological inhibitors, in vivo behavioral assay","journal":"Molecular pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Ca²⁺ imaging, electrophysiology, in vivo behavior), receptor colocalization, single lab","pmids":["30990108"],"is_preprint":false},{"year":2020,"finding":"SIRT1 deacetylates NF-κB, which inhibits NF-κB-mediated transcriptional activation of ET-1 and the MLCK/MLC2 pathway in vascular smooth muscle cells. NF-κB was shown to bind to the ET-1 promoter region by luciferase reporter assay. SIRT1 overexpression inhibited VSMC contraction and proliferation in vitro and alleviated coronary artery spasm in vivo.","method":"Luciferase reporter assay, Western blot, RT-qPCR, siRNA/overexpression, collagen gel contraction assay, in vivo rat CAS model","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter, in vitro and in vivo functional assays with gain/loss-of-function, single lab","pmids":["33095054"],"is_preprint":false},{"year":2014,"finding":"miR-648 targets the 3' UTR of ET-1 mRNA, as demonstrated by luciferase reporter assays using wild-type and mutant ET-1 3' UTR constructs and miR-648 mimic transfection. PlGF represses miR-648 expression, leading to increased ET-1. miR-648 is cotranscriptionally regulated with MICAL3 via the MICAL3 distal promoter (P1) under positive control by PAX5, as shown by ChIP and PAX5 gain/loss-of-function.","method":"Luciferase 3' UTR reporter assay with mutant constructs, miRNA mimic transfection, ChIP for PAX5, PAX5 siRNA/overexpression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct 3' UTR reporter with mutagenesis plus ChIP validating upstream PAX5 regulation, multiple mechanistic methods in one study","pmids":["25403488"],"is_preprint":false},{"year":2021,"finding":"Nuclear respiratory factor 1 (NRF1) transcriptionally activates ET-1 by directly binding to the ET-1 promoter region in endothelial cells under hypoxia conditions. Testosterone represses NRF1 expression in vivo and in vitro, thereby reducing ET-1 levels. This was demonstrated by NRF1 promoter binding assays and testosterone supplementation/castration experiments in rats.","method":"Promoter binding assay, in vivo rat hypoxia model, testosterone supplementation/castration, RT-PCR, ELISA","journal":"Hypertension research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding and in vivo model with hormone manipulation, single lab","pmids":["34257425"],"is_preprint":false},{"year":2023,"finding":"Ang II promotes ET-1 production in human microvascular endothelial cells via a pathway requiring Oct-1 transcription factor-dependent upregulation of NOX2, which increases superoxide anion production. SOD (superoxide dismutase) neutralization of superoxide abolished Ang II-stimulated ET-1 promoter activity, mRNA expression, and ET-1 release. This pathway was also operative in vivo: Nox2-deficient mice failed to increase cardiac ET-1 after high-fat diet.","method":"NOX2 siRNA silencing, Oct-1 siRNA, promoter deletion assays, EMSA, SOD treatment, ELISA, Nox2-KO mice, RT-qPCR","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (siRNA, promoter deletion, EMSA, KO mouse) establishing mechanistic pathway from Ang II → Oct-1 → NOX2 → superoxide → ET-1 promoter","pmids":["37381986"],"is_preprint":false},{"year":2024,"finding":"Ang-(1-7) and ET-1 engage in cross talk through a physical interaction between the Mas receptor (MasR) and ETB receptor (ETBR) to produce vasoprotective signaling. Co-immunoprecipitation and peptide array experiments demonstrated direct MasR:ETBR interaction; binding sites on MasR (aa 290-314) and ETBR (aa 176-200) were mapped. Disrupting peptides blocked both Ang-(1-7) and ET-1 signaling, and compounds enhancing MasR:ETBR interaction amplified eNOS/NO activity and vasorelaxation.","method":"Co-immunoprecipitation, peptide array binding mapping, eNOS activity assay, vascular contractility assay, mouse pulmonary hypertension model","journal":"Hypertension","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct protein interaction mapping with co-IP and peptide arrays, functional validation in cells, isolated arteries, and in vivo model","pmids":["39633565"],"is_preprint":false},{"year":2022,"finding":"ARHGEF2 promotes angiogenesis in hepatocellular carcinoma via the EDN1 pathway; ER stress upregulates ARHGEF2 through ZNF263, and elevated ARHGEF2 increases EDN1 expression to accelerate HCC angiogenesis and drug resistance. ARHGEF2 knockdown combined with targeted medicines showed greater HCC cell growth inhibition.","method":"RNA-seq, ATAC-seq, ChIP-seq, siRNA knockdown, in vitro and in vivo HCC models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-omic and functional knockdown approach establishing pathway ordering, single lab","pmids":["35896520"],"is_preprint":false},{"year":2022,"finding":"The EDN1/EDNRA/β-arrestin axis activates STAT3 phosphorylation in colorectal cancer cells; EDNRA knockdown suppressed STAT3 phosphorylation, and STAT3 directly binds to EDN1 and EDNRA promoters to form a positive feedback loop, as shown by ChIP and promoter luciferase assays.","method":"Phosphokinase array, siRNA knockdown, ChIP, promoter luciferase assay, cell proliferation/migration assays","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and promoter reporter with siRNA knockdown establishing feedback loop, single lab","pmids":["36453252"],"is_preprint":false},{"year":2019,"finding":"ET-1 inhibits B-16 melanoma cell migration by decreasing Ca²⁺-regulated K⁺ currents via a PKC-dependent pathway. Ca²⁺-regulated K⁺ channel blockers mimicked ET-1 inhibition of migration; K⁺ channel opener diclofenac reversed ET-1-induced inhibition of both K⁺ current and migration.","method":"Patch-clamp whole-cell recording, transwell migration assay, pharmacological channel blockers/openers","journal":"Cell motility and the cytoskeleton","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology combined with functional migration assay and pharmacological rescue, single lab","pmids":["15083534"],"is_preprint":false},{"year":2020,"finding":"PER1 (circadian clock protein) acts as a negative regulator of ET-1 expression in renal collecting duct cells in response to high-salt/mineralocorticoid treatment; siRNA-mediated knockdown of PER1 in mpkCCDc14 cells increased ET-1 mRNA expression and peptide secretion in response to aldosterone.","method":"siRNA knockdown of PER1, RT-PCR, ELISA, PER1 global knockout mice with HS/DOCP treatment","journal":"Canadian journal of physiology and pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown in vitro corroborated by in vivo KO mouse model, single lab","pmids":["32437627"],"is_preprint":false}],"current_model":"EDN1 encodes endothelin-1 (ET-1), a 21-amino acid peptide that is transcriptionally regulated by multiple inputs including HIF-1α (via hypoxia response elements), aldosterone (via mineralocorticoid/glucocorticoid receptor binding to hormone response elements), NF-κB, NRF1, Ang II (via Oct-1/NOX2/superoxide), TGF-β/ALK5/Smad3, and miR-648 (targeting its 3' UTR); once secreted, ET-1 signals primarily through ETA and ETB G-protein-coupled receptors to activate PKC, intracellular Ca²⁺ mobilization, RhoA/Rho-kinase, MAPK (ERK/p38), and PLC pathways, driving vasoconstriction, collagen synthesis, VSMC proliferation, and cytoskeletal remodeling, while ETB receptor activation provides a negative feedback on ET-1 mRNA abundance through ERK/p38-dependent mechanisms; ET-1 also physically interacts with ETBR which heterodimerizes with the Mas receptor to mediate vasoprotective Ang-(1-7) cross-talk."},"narrative":{"mechanistic_narrative":"EDN1 encodes endothelin-1 (ET-1), a secreted vasoactive peptide that drives vasoconstriction, smooth muscle contractility, and tissue remodeling through G-protein-coupled ETA and ETB receptor signaling [PMID:15838290, PMID:16336267]. ET-1 transcription integrates numerous inputs: hypoxia-driven HIF-1α binding to hypoxia response elements (negatively tuned by miR-199) [PMID:19783678], NRF1 promoter binding under hypoxia (repressed by testosterone) [PMID:34257425], aldosterone via mineralocorticoid and glucocorticoid receptors recruiting RNA Pol II to the edn1 promoter [PMID:19638349], TGF-β through the ALK5/Smad3 axis [PMID:17376964], and Ang II via an Oct-1/NOX2/superoxide cascade acting on the promoter [PMID:37381986]; NF-κB activates ET-1 and is antagonized by SIRT1 deacetylation [PMID:33095054], while PER1 [PMID:32437627], the DHEA/PI3K-FoxO1 axis [PMID:18718910], and the miR-648 3' UTR interaction [PMID:25403488] provide additional negative control. Once secreted, ET-1 acting through ETA mobilizes intracellular Ca²⁺ via G-protein/IP3 and PLC [PMID:12529247, PMID:14656702], activates PKC [PMID:9486138], and engages the PI3K–RhoA–Rho-kinase–MLC and Src/JAK2/MAPK pathways to produce contraction [PMID:15838290, PMID:12893655], with O-GlcNAcylation reinforcing RhoA-dependent contractile responses [PMID:20978008]. These signals drive collagen and CTGF synthesis in fibroblasts [PMID:16336267], COX-2/prostacyclin production [PMID:1324048, PMID:12618423], and downstream transcriptional programs including ets-1 and collagenase [PMID:9486138]; extracellular ET-1 also exerts ETB-dependent negative feedback on its own mRNA stability and transcription via ERK and p38 MAPK [PMID:18278064]. ET-1 contributes to neuronal sensitization through ETA/PKA-mediated TRPA1 potentiation [PMID:30990108] and to tumor angiogenesis and proliferation via ARHGEF2/EDN1 [PMID:35896520] and EDNRA/β-arrestin/STAT3 feedback loops [PMID:36453252]. ET-1 physically engages ETB receptor, which heterodimerizes with the Mas receptor to mediate vasoprotective Ang-(1-7) cross-talk and eNOS/NO signaling [PMID:39633565].","teleology":[{"year":1990,"claim":"Establishing how ET-1 receptors are regulated post-translationally clarified that agonist exposure desensitizes signaling through receptor trafficking rather than PKC.","evidence":"Radioligand binding, internalization kinetics, and crosslinking identifying a 66 kDa ET-1 receptor in C-6 glioma cells","pmids":["2161363"],"confidence":"Medium","gaps":["Did not assign the 66 kDa receptor to ETA vs ETB","Downstream signaling consequences of internalization not resolved"]},{"year":1992,"claim":"Defining which receptor subtype couples ET-1 to vasoactive mediator release showed ETA selectively triggers prostacyclin output.","evidence":"Rat perfused lung with selective ETA antagonist BQ-123 and radioligand binding","pmids":["1324048"],"confidence":"Medium","gaps":["Intracellular signaling linking ETA to PGI2 not mapped","ETB contribution not separately tested"]},{"year":1998,"claim":"Ordering the ET-1 contractile/remodeling cascade established a PKC- and Ca²⁺-dependent route to ets-1 and collagenase induction in vascular smooth muscle.","evidence":"RT-PCR with PKC inhibition, Ca²⁺ chelation, and cycloheximide superinduction","pmids":["9486138"],"confidence":"Medium","gaps":["Receptor subtype driving ets-1 not specified","Direct promoter occupancy not demonstrated"]},{"year":2003,"claim":"Dissecting ETA-coupled signaling across contraction, Ca²⁺ mobilization, and CSD defined parallel Src/JAK2/MAPK, PI3K/RhoA/Rho-kinase, PKC, and PLC/IP3 branches.","evidence":"Isometric tension, Ca²⁺ imaging, and in vivo CSD models with broad pharmacological inhibitor panels","pmids":["15838290","12529247","14656702","12618423"],"confidence":"Medium","gaps":["Cross-talk hierarchy among branches incompletely resolved","Tissue-specific weighting of pathways not generalized"]},{"year":2003,"claim":"Demonstrating RhoA membrane translocation under combined agonist stimulation explained ET-1's synergistic potentiation of vasoconstriction.","evidence":"Isolated corpus cavernosum contraction with ETA blockade, Rho kinase inhibition, and RhoA membrane fractionation","pmids":["12893655"],"confidence":"Medium","gaps":["RhoGEF mediating translocation not identified here","Generalizability to systemic vasculature untested"]},{"year":2004,"claim":"Placing ET-1 upstream of TNF-α established its causal role in triggering hepatopulmonary syndrome.","evidence":"ET-1 infusion in portal hypertensive rat models with HPS marker phenotyping","pmids":["14715521"],"confidence":"Medium","gaps":["Receptor mediating TNF-α induction not defined","Cellular source of TNF-α not identified"]},{"year":2005,"claim":"Mapping the ET-1 fibrotic program identified Gαi/PC-PLC/PLD-dependent collagen I and CTGF induction with ETA-to-ETB receptor switching during chronic stimulation.","evidence":"Pharmacological G-protein/phospholipase inhibition with Western blot and RT-PCR in dermal fibroblasts","pmids":["16336267"],"confidence":"Medium","gaps":["Trigger for receptor subtype switching unknown","Transcriptional mediators of CTGF biphasic kinetics not resolved"]},{"year":2007,"claim":"Identifying TGF-β/ALK5/Smad3 as an ET-1 inducer revealed an autocrine ET-1 loop mediating TGF-β's anti-migratory effects on endothelium.","evidence":"ALK5 inhibition and ET receptor antagonism in endothelial migration/proliferation assays","pmids":["17376964"],"confidence":"Medium","gaps":["Direct Smad3 binding to edn1 promoter not shown","Receptor subtype for autocrine effect not specified"]},{"year":2008,"claim":"Characterizing ETB-dependent autoregulation showed extracellular ET-1 suppresses its own mRNA via stability changes and ERK/p38 MAPK, defining a negative feedback loop.","evidence":"mRNA stability assays, RNA Pol II ChIP, and MAPK/receptor antagonists in porcine aortic endothelial cells","pmids":["18278064"],"confidence":"Medium","gaps":["RNA-binding factors controlling mRNA stability not identified","Physiological context where feedback dominates unclear"]},{"year":2008,"claim":"Defining the DHEA/PI3K-FoxO1 versus MAPK balance established opposing transcriptional control of ET-1 secretion in endothelium.","evidence":"ET-1 promoter luciferase reporter, PKA siRNA, and wortmannin/H89 inhibition with DHEA","pmids":["18718910"],"confidence":"Medium","gaps":["FoxO1 binding site on edn1 promoter not directly mapped","In vivo relevance of DHEA control untested"]},{"year":2009,"claim":"Demonstrating HIF-1α occupancy of hypoxia response elements and aldosterone-driven MR/GR promoter binding established direct hypoxic and hormonal transcriptional control of EDN1.","evidence":"ChIP, promoter analysis, miRNA antagonism, and siRNA knockdown in liver endothelial and renal collecting duct cells","pmids":["19783678","19638349"],"confidence":"High","gaps":["Interaction between hypoxic and hormonal inputs not examined","Cell-type specificity of the responses not generalized"]},{"year":2010,"claim":"Linking ET-1 to vascular O-GlcNAcylation identified OGT-dependent reinforcement of RhoA/Rho-kinase contractile signaling.","evidence":"OGT siRNA and inhibitor with vascular contraction assays and RhoA pathway Western blots","pmids":["20978008"],"confidence":"Medium","gaps":["O-GlcNAc target proteins driving RhoA activation not identified","Reversibility/dynamics not characterized"]},{"year":2012,"claim":"Showing a shift to VDCC-mediated Ca²⁺ entry after chronic hypoxia revealed pathologic remodeling of ET-1 Ca²⁺ signaling in pulmonary arterial smooth muscle.","evidence":"Fura-2 Ca²⁺ imaging with PKC, Rho kinase, and tyrosine kinase inhibitors","pmids":["22387294"],"confidence":"Medium","gaps":["Molecular basis for loss of K⁺-channel coupling unknown","Specific VDCC subtype not defined"]},{"year":2014,"claim":"Identifying miR-648 targeting of the ET-1 3' UTR established a post-transcriptional brake on ET-1, itself under PlGF and PAX5 control.","evidence":"Luciferase 3' UTR reporters with mutant constructs, miRNA mimics, and PAX5 ChIP/gain-loss","pmids":["25403488"],"confidence":"High","gaps":["Physiological context where miR-648 dominates not defined","Quantitative contribution versus transcriptional control unclear"]},{"year":2019,"claim":"Demonstrating ETA/PKA-mediated TRPA1 sensitization extended ET-1 function into nociception and mechanical hyperalgesia.","evidence":"Ca²⁺ imaging, electrophysiology, colocalization, and in vivo behavioral assays in sensory neurons","pmids":["30990108"],"confidence":"Medium","gaps":["Direct ETA–TRPA1 physical coupling not shown","PKA phosphorylation site on TRPA1 not mapped"]},{"year":2019,"claim":"Showing ET-1 suppresses Ca²⁺-regulated K⁺ currents revealed a PKC-dependent inhibition of melanoma migration.","evidence":"Patch-clamp recording, transwell migration, and pharmacological channel modulation","pmids":["15083534"],"confidence":"Medium","gaps":["Receptor subtype not specified","Channel identity not molecularly defined"]},{"year":2020,"claim":"Establishing SIRT1 deacetylation of NF-κB and PER1 repression defined negative regulatory nodes controlling ET-1-driven contraction and salt responses.","evidence":"Luciferase reporters, gain/loss-of-function, contraction assays, and in vivo CAS and PER1-KO models","pmids":["33095054","32437627"],"confidence":"Medium","gaps":["Interplay between circadian and inflammatory control of EDN1 not integrated","NF-κB binding site fine-mapping incomplete"]},{"year":2021,"claim":"Identifying NRF1 as a direct hypoxic activator of EDN1, repressed by testosterone, added a sex-hormone-modulated transcriptional input.","evidence":"Promoter binding assays with in vivo rat hypoxia and testosterone manipulation","pmids":["34257425"],"confidence":"Medium","gaps":["NRF1 binding site sequence not resolved","Relationship to HIF-1α input under hypoxia unexamined"]},{"year":2022,"claim":"Linking EDN1 to oncogenic circuits revealed ARHGEF2/EDN1-driven HCC angiogenesis and an EDNRA/β-arrestin/STAT3 positive feedback loop in colorectal cancer.","evidence":"Multi-omics, ChIP, promoter luciferase, and siRNA knockdown in tumor models","pmids":["35896520","36453252"],"confidence":"Medium","gaps":["Direct STAT3 versus indirect promoter effects not fully separated","Therapeutic generalizability across tumor types untested"]},{"year":2023,"claim":"Resolving the Ang II → Oct-1 → NOX2 → superoxide → EDN1 promoter pathway established a redox-dependent transcriptional mechanism validated in vivo.","evidence":"siRNA, promoter deletion, EMSA, SOD treatment, and Nox2-KO mice","pmids":["37381986"],"confidence":"High","gaps":["Superoxide-sensitive transcription factor at the promoter not fully defined","Crosstalk with other Ang II effectors not addressed"]},{"year":2024,"claim":"Mapping a direct MasR:ETBR physical interaction defined the structural basis for vasoprotective Ang-(1-7)/ET-1 cross-talk and eNOS/NO signaling.","evidence":"Co-IP, peptide array binding mapping, eNOS/vascular contractility assays, and a mouse pulmonary hypertension model","pmids":["39633565"],"confidence":"High","gaps":["Stoichiometry and structural model of the heterodimer not resolved","G-protein coupling consequences of dimerization not detailed"]},{"year":null,"claim":"How the many transcriptional, post-transcriptional, and receptor-level regulatory inputs are integrated within a single cell type to set ET-1 output in physiology versus disease remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling competing HIF-1α, NRF1, MR/GR, NF-κB, and miRNA inputs","Receptor heterodimerization dynamics in native tissue uncharacterized","Quantitative 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\"method\": \"Chromatin immunoprecipitation, promoter analysis, miRNA transfection/antagonism\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and promoter analysis with miRNA gain/loss-of-function, single lab\",\n      \"pmids\": [\"19783678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TGF-β induces ET-1 expression in endothelial cells preferentially through the ALK5/Smad3 pathway; specific ALK5 inhibition blocked this induction. ET-1 acts in an autocrine manner to mediate a significant portion of TGF-β's anti-migratory and anti-proliferative effects on endothelial cells, as shown by ET receptor antagonism partially reverting TGF-β effects.\",\n      \"method\": \"Pharmacological inhibition of ALK5, ET receptor antagonism, migration/proliferation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal pharmacological approaches in endothelial cells, single lab\",\n      \"pmids\": [\"17376964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ET-1 induces collagen I synthesis in human dermal fibroblasts via ETA receptor signaling through Gαi, phosphatidylcholine-phospholipase C (PC-PLC), and phospholipase D (PLD), but not phospholipase Cβ. Prolonged ET-1 stimulation causes a switch in receptor subtype expression from ETA to ETB and biphasic induction of connective tissue growth factor (CTGF).\",\n      \"method\": \"Pharmacological inhibition of G-proteins and phospholipases, Western blot, RT-PCR\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors, receptor subtype characterization, single lab\",\n      \"pmids\": [\"16336267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ET-1 stimulates Ca²⁺ mobilization in human brain capillary endothelial cells via G-protein/IP3 pathway; this is dose-dependently inhibited by NO via a guanylyl cyclase/PKG-dependent mechanism. cGMP-dependent protein kinase was shown to colocalize with actin, and NO/cGMP reduced Ca²⁺ mobilization induced by thapsigargin and IP3, with associated alterations in actin/vimentin cytoskeleton.\",\n      \"method\": \"Ca²⁺ imaging, pharmacological inhibitors, immunolocalization\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological approaches with functional Ca²⁺ readout and cytoskeletal analysis, single lab\",\n      \"pmids\": [\"12529247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ET-1 induces ets-1 mRNA expression in vascular smooth muscle cells via a PKC-dependent, intracellular Ca²⁺-dependent pathway. Inhibition of PKC (H-7) or chelation of intracellular Ca²⁺ blocked ET-1-induced ets-1 expression. ET-1-induced ets-1 activation subsequently drives collagenase I mRNA expression.\",\n      \"method\": \"RT-PCR, pharmacological inhibition of PKC and Ca²⁺ chelation, cycloheximide superinduction\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors with mRNA readout, pathway ordering established, single lab\",\n      \"pmids\": [\"9486138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Aldosterone transcriptionally induces ET-1 (edn1) gene expression in renal collecting duct cells via mineralocorticoid receptor and glucocorticoid receptor binding to hormone response elements in the edn1 promoter. This was demonstrated by ChIP showing nuclear translocation and promoter binding of both receptors, histone modification, and RNA polymerase II recruitment. siRNA knockdown of both receptors corroborated pharmacological studies.\",\n      \"method\": \"Chromatin immunoprecipitation, siRNA knockdown, nuclear translocation assay, hnRNA measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ChIP, siRNA, and promoter occupancy with multiple orthogonal methods demonstrating direct transcriptional regulation\",\n      \"pmids\": [\"19638349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DHEA stimulates phosphorylation and nuclear exclusion of FoxO1 in endothelial cells via PI3-kinase- and PKA-dependent pathways. A constitutively nuclear FoxO1 mutant transactivates the ET-1 promoter; DHEA inhibits this transactivation. PI3K blockade augments ET-1 promoter activity and secretion, while MAPK blockade inhibits them, establishing a balance between PI3K-dependent inhibition and MAPK-dependent stimulation of ET-1 secretion.\",\n      \"method\": \"ET-1 promoter luciferase reporter, siRNA knockdown of PKA, wortmannin/H89 inhibition, DHEA treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — promoter reporter assay, siRNA, and pharmacological inhibitors in endothelial cells, single lab\",\n      \"pmids\": [\"18718910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ET-1 augments vascular O-GlcNAcylation in smooth muscle cells via ETA receptor activation, and this O-GlcNAcylation contributes to increased vascular contractile responses by activating the RhoA/Rho-kinase pathway including phosphorylation of MYPT-1, PKC-potentiated phosphatase inhibitor-17, MLC, and upregulation of RhoGEFs. OGT siRNA or OGT inhibitor abolished ET-1-induced O-GlcNAcylation and RhoA activation.\",\n      \"method\": \"OGT siRNA transfection, OGT inhibitor, vascular contraction assay, Western blot for RhoA pathway components\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown and pharmacological inhibition with multiple downstream readouts, single lab\",\n      \"pmids\": [\"20978008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Both ET-1 and human big-ET-1 release prostacyclin (PGI₂) in rat perfused lungs via selective activation of ET1 (ETA) receptors, as demonstrated by blockade with the selective ETA antagonist BQ-123.\",\n      \"method\": \"Rat perfused lung preparation, selective ETA receptor antagonist BQ-123, radioligand binding\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ex vivo organ preparation with selective receptor antagonism, single lab\",\n      \"pmids\": [\"1324048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ET-1 induces cortical spreading depression via ETA receptor and phospholipase C (PLC) activation, but not ETB receptor activation. ETA antagonist BQ-123 completely blocked ET-1-induced CSDs; ETB antagonist BQ-788 had no effect. PLC antagonist U-73122 inhibited CSD; PKC inhibitor Gö-6983 did not.\",\n      \"method\": \"In vivo cortical spreading depression model, selective receptor antagonists, PLC/PKC inhibitors\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo pharmacological dissection with selective antagonists, single lab\",\n      \"pmids\": [\"14656702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ET-1 regulates COX-2 expression (but not COX-1) in peripheral lung vascular smooth muscle cells via ETA receptor activation and phosphorylation of p38 and p44/42 MAPK. ET-1 also stimulates its own synthesis (ppET-1 expression) via both ETA and ETB receptors. ET-1 signaling increases prostacyclin and PGE₂ release.\",\n      \"method\": \"ET receptor antagonists (BQ-610, BQ-788), MAPK inhibitors (SB-203580, PD-98056), RT-PCR, Western blot, ELISA, GC-MS\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological antagonists with mechanistic pathway ordering, single lab\",\n      \"pmids\": [\"12618423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ET-1 receptor down-regulation in C-6 glioma cells occurs via increased endocytosis of the hormone-receptor complex and decreased receptor insertion into the plasma membrane. PKC activation by PMA causes a similar down-regulation by the same mechanism. ET-1-mediated down-regulation does not involve PKC. A 66 kDa protein was identified as the ET-1 receptor by crosslinking.\",\n      \"method\": \"Radioligand binding, internalization kinetics modeling, chemical crosslinking/SDS-PAGE, PKC inhibition\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative binding assay with kinetic modeling and crosslinking, single lab\",\n      \"pmids\": [\"2161363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Activation of ETB receptors by extracellular ET-1 reduces ET-1 mRNA abundance in porcine aortic endothelial cells by simultaneously decreasing ET-1 mRNA stability and transiently increasing RNA Pol II loading at the ET-1 promoter. This feedback involves receptor endocytosis and both ERK and p38 MAPK pathways: p38 MAPK inhibition prevented ET-1-induced decrease in ET-1 mRNA; ERK1/2 inhibition increased ET-1 mRNA. ETA antagonism had no effect.\",\n      \"method\": \"mRNA stability assay, promoter activity (RNA Pol II ChIP), MAPK inhibitors, selective ET receptor antagonists\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (mRNA stability, ChIP, pharmacological), single lab\",\n      \"pmids\": [\"18278064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ET-1-induced contraction of rabbit basilar artery proceeds via three signaling pathways: (1) Src-JAK2-PTK-MAPK, (2) PI3K-RhoA-Rho kinase-MLC phosphorylation, and (3) PKC, all acting through the ETA receptor. MAPK is downstream of PTK, Src, and JAK pathways; PI3K is upstream of RhoA activation; Rho kinase inhibition reduces MLC phosphorylation and contraction.\",\n      \"method\": \"Isometric tension measurement, Western blot for MAPK/RhoA, pharmacological inhibitors (PD98059, U0126, genistein, damnacanthal, AG-490, wortmannin, Y-27632)\",\n      \"journal\": \"Journal of cardiovascular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors with functional contraction and phosphorylation readouts, single lab\",\n      \"pmids\": [\"15838290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Following chronic hypoxia, ET-1-induced Ca²⁺ increase in pulmonary arterial smooth muscle cells occurs via voltage-dependent Ca²⁺ channels (VDCC) activated primarily by PKC, tyrosine kinases, and Rho kinase (>70% reduction by their respective inhibitors), rather than by K⁺ channel inhibition-mediated depolarization that is lost after chronic hypoxia.\",\n      \"method\": \"Fura-2 Ca²⁺ imaging, PKC inhibitors (staurosporine, GF109203X), Rho kinase inhibitors (Y-27632, HA1077), tyrosine kinase inhibitors\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Ca²⁺ imaging with multiple selective kinase inhibitors, single lab\",\n      \"pmids\": [\"22387294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ET-1 activates RhoA-Rho kinase pathway to potentiate synergistic vasoconstriction with phenylephrine in rat corpus cavernosum. ETA receptor blockade reversed the augmented contraction, and Rho kinase inhibitor Y-27632 dose-dependently relaxed tissue. The combined ET-1+PE stimulus produced a fourfold increase of RhoA in membrane fractions compared to either agonist alone.\",\n      \"method\": \"Isolated tissue contraction assay, Western blot for RhoA membrane translocation, ETA receptor antagonist (A-127722), Rho kinase inhibitor (Y-27632)\",\n      \"journal\": \"American journal of physiology. Regulatory, integrative and comparative physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ex vivo contraction assay with selective receptor blockade and Rho kinase inhibition, Western blot for RhoA, single lab\",\n      \"pmids\": [\"12893655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The transmembrane segment 1 (amino acids 93-131) of the human endothelin B receptor is a central region required for both ET-1 binding and homodimer (homo-oligomer) formation, as demonstrated by systematic deletion analysis of cell-free produced ETB receptor fragments in pulldown, coelution, and surface plasmon resonance assays.\",\n      \"method\": \"Cell-free expression, pulldown assay, coelution, surface plasmon resonance, single-particle analysis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple binding assays and deletion mutagenesis, single lab\",\n      \"pmids\": [\"17535295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Exogenous ET-1 infusion in portal hypertensive (PVL) rats increases TNF-α levels and triggers the full hepatopulmonary syndrome (HPS) including pulmonary microvascular changes, establishing that ET-1 is upstream of TNF-α in triggering HPS. Biliary cirrhosis uniquely produces both elevated ET-1 and TNF-α, which together induce HPS.\",\n      \"method\": \"Rat models (CBDL, PVL, TAA), ET-1 infusion, molecular and physiological evaluation of HPS markers\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ET-1 infusion with molecular phenotyping establishing pathway ordering, single lab\",\n      \"pmids\": [\"14715521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ET-1 sensitizes TRPA1 channels in primary sensory neurons via the ETA receptor and protein kinase A (PKA) pathway, contributing to mechanical hyperalgesia. ETAR was shown to colocalize with TRPA1 in DRG neurons; pharmacological blocking of ETAR, PKA, or TRPA1 attenuated ET-1-induced mechanical hyperalgesia in vivo.\",\n      \"method\": \"Ca²⁺ imaging, electrophysiology, immunostaining, pharmacological inhibitors, in vivo behavioral assay\",\n      \"journal\": \"Molecular pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Ca²⁺ imaging, electrophysiology, in vivo behavior), receptor colocalization, single lab\",\n      \"pmids\": [\"30990108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIRT1 deacetylates NF-κB, which inhibits NF-κB-mediated transcriptional activation of ET-1 and the MLCK/MLC2 pathway in vascular smooth muscle cells. NF-κB was shown to bind to the ET-1 promoter region by luciferase reporter assay. SIRT1 overexpression inhibited VSMC contraction and proliferation in vitro and alleviated coronary artery spasm in vivo.\",\n      \"method\": \"Luciferase reporter assay, Western blot, RT-qPCR, siRNA/overexpression, collagen gel contraction assay, in vivo rat CAS model\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter, in vitro and in vivo functional assays with gain/loss-of-function, single lab\",\n      \"pmids\": [\"33095054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-648 targets the 3' UTR of ET-1 mRNA, as demonstrated by luciferase reporter assays using wild-type and mutant ET-1 3' UTR constructs and miR-648 mimic transfection. PlGF represses miR-648 expression, leading to increased ET-1. miR-648 is cotranscriptionally regulated with MICAL3 via the MICAL3 distal promoter (P1) under positive control by PAX5, as shown by ChIP and PAX5 gain/loss-of-function.\",\n      \"method\": \"Luciferase 3' UTR reporter assay with mutant constructs, miRNA mimic transfection, ChIP for PAX5, PAX5 siRNA/overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct 3' UTR reporter with mutagenesis plus ChIP validating upstream PAX5 regulation, multiple mechanistic methods in one study\",\n      \"pmids\": [\"25403488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nuclear respiratory factor 1 (NRF1) transcriptionally activates ET-1 by directly binding to the ET-1 promoter region in endothelial cells under hypoxia conditions. Testosterone represses NRF1 expression in vivo and in vitro, thereby reducing ET-1 levels. This was demonstrated by NRF1 promoter binding assays and testosterone supplementation/castration experiments in rats.\",\n      \"method\": \"Promoter binding assay, in vivo rat hypoxia model, testosterone supplementation/castration, RT-PCR, ELISA\",\n      \"journal\": \"Hypertension research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding and in vivo model with hormone manipulation, single lab\",\n      \"pmids\": [\"34257425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ang II promotes ET-1 production in human microvascular endothelial cells via a pathway requiring Oct-1 transcription factor-dependent upregulation of NOX2, which increases superoxide anion production. SOD (superoxide dismutase) neutralization of superoxide abolished Ang II-stimulated ET-1 promoter activity, mRNA expression, and ET-1 release. This pathway was also operative in vivo: Nox2-deficient mice failed to increase cardiac ET-1 after high-fat diet.\",\n      \"method\": \"NOX2 siRNA silencing, Oct-1 siRNA, promoter deletion assays, EMSA, SOD treatment, ELISA, Nox2-KO mice, RT-qPCR\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (siRNA, promoter deletion, EMSA, KO mouse) establishing mechanistic pathway from Ang II → Oct-1 → NOX2 → superoxide → ET-1 promoter\",\n      \"pmids\": [\"37381986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Ang-(1-7) and ET-1 engage in cross talk through a physical interaction between the Mas receptor (MasR) and ETB receptor (ETBR) to produce vasoprotective signaling. Co-immunoprecipitation and peptide array experiments demonstrated direct MasR:ETBR interaction; binding sites on MasR (aa 290-314) and ETBR (aa 176-200) were mapped. Disrupting peptides blocked both Ang-(1-7) and ET-1 signaling, and compounds enhancing MasR:ETBR interaction amplified eNOS/NO activity and vasorelaxation.\",\n      \"method\": \"Co-immunoprecipitation, peptide array binding mapping, eNOS activity assay, vascular contractility assay, mouse pulmonary hypertension model\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct protein interaction mapping with co-IP and peptide arrays, functional validation in cells, isolated arteries, and in vivo model\",\n      \"pmids\": [\"39633565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ARHGEF2 promotes angiogenesis in hepatocellular carcinoma via the EDN1 pathway; ER stress upregulates ARHGEF2 through ZNF263, and elevated ARHGEF2 increases EDN1 expression to accelerate HCC angiogenesis and drug resistance. ARHGEF2 knockdown combined with targeted medicines showed greater HCC cell growth inhibition.\",\n      \"method\": \"RNA-seq, ATAC-seq, ChIP-seq, siRNA knockdown, in vitro and in vivo HCC models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-omic and functional knockdown approach establishing pathway ordering, single lab\",\n      \"pmids\": [\"35896520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The EDN1/EDNRA/β-arrestin axis activates STAT3 phosphorylation in colorectal cancer cells; EDNRA knockdown suppressed STAT3 phosphorylation, and STAT3 directly binds to EDN1 and EDNRA promoters to form a positive feedback loop, as shown by ChIP and promoter luciferase assays.\",\n      \"method\": \"Phosphokinase array, siRNA knockdown, ChIP, promoter luciferase assay, cell proliferation/migration assays\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and promoter reporter with siRNA knockdown establishing feedback loop, single lab\",\n      \"pmids\": [\"36453252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ET-1 inhibits B-16 melanoma cell migration by decreasing Ca²⁺-regulated K⁺ currents via a PKC-dependent pathway. Ca²⁺-regulated K⁺ channel blockers mimicked ET-1 inhibition of migration; K⁺ channel opener diclofenac reversed ET-1-induced inhibition of both K⁺ current and migration.\",\n      \"method\": \"Patch-clamp whole-cell recording, transwell migration assay, pharmacological channel blockers/openers\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology combined with functional migration assay and pharmacological rescue, single lab\",\n      \"pmids\": [\"15083534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PER1 (circadian clock protein) acts as a negative regulator of ET-1 expression in renal collecting duct cells in response to high-salt/mineralocorticoid treatment; siRNA-mediated knockdown of PER1 in mpkCCDc14 cells increased ET-1 mRNA expression and peptide secretion in response to aldosterone.\",\n      \"method\": \"siRNA knockdown of PER1, RT-PCR, ELISA, PER1 global knockout mice with HS/DOCP treatment\",\n      \"journal\": \"Canadian journal of physiology and pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown in vitro corroborated by in vivo KO mouse model, single lab\",\n      \"pmids\": [\"32437627\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EDN1 encodes endothelin-1 (ET-1), a 21-amino acid peptide that is transcriptionally regulated by multiple inputs including HIF-1α (via hypoxia response elements), aldosterone (via mineralocorticoid/glucocorticoid receptor binding to hormone response elements), NF-κB, NRF1, Ang II (via Oct-1/NOX2/superoxide), TGF-β/ALK5/Smad3, and miR-648 (targeting its 3' UTR); once secreted, ET-1 signals primarily through ETA and ETB G-protein-coupled receptors to activate PKC, intracellular Ca²⁺ mobilization, RhoA/Rho-kinase, MAPK (ERK/p38), and PLC pathways, driving vasoconstriction, collagen synthesis, VSMC proliferation, and cytoskeletal remodeling, while ETB receptor activation provides a negative feedback on ET-1 mRNA abundance through ERK/p38-dependent mechanisms; ET-1 also physically interacts with ETBR which heterodimerizes with the Mas receptor to mediate vasoprotective Ang-(1-7) cross-talk.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EDN1 encodes endothelin-1 (ET-1), a secreted vasoactive peptide that drives vasoconstriction, smooth muscle contractility, and tissue remodeling through G-protein-coupled ETA and ETB receptor signaling [#13, #2]. ET-1 transcription integrates numerous inputs: hypoxia-driven HIF-1\\u03b1 binding to hypoxia response elements (negatively tuned by miR-199) [#0], NRF1 promoter binding under hypoxia (repressed by testosterone) [#21], aldosterone via mineralocorticoid and glucocorticoid receptors recruiting RNA Pol II to the edn1 promoter [#5], TGF-\\u03b2 through the ALK5/Smad3 axis [#1], and Ang II via an Oct-1/NOX2/superoxide cascade acting on the promoter [#22]; NF-\\u03baB activates ET-1 and is antagonized by SIRT1 deacetylation [#19], while PER1 [#27], the DHEA/PI3K-FoxO1 axis [#6], and the miR-648 3' UTR interaction [#20] provide additional negative control. Once secreted, ET-1 acting through ETA mobilizes intracellular Ca\\u00b2\\u207a via G-protein/IP3 and PLC [#3, #9], activates PKC [#4], and engages the PI3K\\u2013RhoA\\u2013Rho-kinase\\u2013MLC and Src/JAK2/MAPK pathways to produce contraction [#13, #15], with O-GlcNAcylation reinforcing RhoA-dependent contractile responses [#7]. These signals drive collagen and CTGF synthesis in fibroblasts [#2], COX-2/prostacyclin production [#8, #10], and downstream transcriptional programs including ets-1 and collagenase [#4]; extracellular ET-1 also exerts ETB-dependent negative feedback on its own mRNA stability and transcription via ERK and p38 MAPK [#12]. ET-1 contributes to neuronal sensitization through ETA/PKA-mediated TRPA1 potentiation [#18] and to tumor angiogenesis and proliferation via ARHGEF2/EDN1 [#24] and EDNRA/\\u03b2-arrestin/STAT3 feedback loops [#25]. ET-1 physically engages ETB receptor, which heterodimerizes with the Mas receptor to mediate vasoprotective Ang-(1-7) cross-talk and eNOS/NO signaling [#23].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing how ET-1 receptors are regulated post-translationally clarified that agonist exposure desensitizes signaling through receptor trafficking rather than PKC.\",\n      \"evidence\": \"Radioligand binding, internalization kinetics, and crosslinking identifying a 66 kDa ET-1 receptor in C-6 glioma cells\",\n      \"pmids\": [\"2161363\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not assign the 66 kDa receptor to ETA vs ETB\", \"Downstream signaling consequences of internalization not resolved\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Defining which receptor subtype couples ET-1 to vasoactive mediator release showed ETA selectively triggers prostacyclin output.\",\n      \"evidence\": \"Rat perfused lung with selective ETA antagonist BQ-123 and radioligand binding\",\n      \"pmids\": [\"1324048\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Intracellular signaling linking ETA to PGI2 not mapped\", \"ETB contribution not separately tested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Ordering the ET-1 contractile/remodeling cascade established a PKC- and Ca\\u00b2\\u207a-dependent route to ets-1 and collagenase induction in vascular smooth muscle.\",\n      \"evidence\": \"RT-PCR with PKC inhibition, Ca\\u00b2\\u207a chelation, and cycloheximide superinduction\",\n      \"pmids\": [\"9486138\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor subtype driving ets-1 not specified\", \"Direct promoter occupancy not demonstrated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Dissecting ETA-coupled signaling across contraction, Ca\\u00b2\\u207a mobilization, and CSD defined parallel Src/JAK2/MAPK, PI3K/RhoA/Rho-kinase, PKC, and PLC/IP3 branches.\",\n      \"evidence\": \"Isometric tension, Ca\\u00b2\\u207a imaging, and in vivo CSD models with broad pharmacological inhibitor panels\",\n      \"pmids\": [\"15838290\", \"12529247\", \"14656702\", \"12618423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-talk hierarchy among branches incompletely resolved\", \"Tissue-specific weighting of pathways not generalized\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating RhoA membrane translocation under combined agonist stimulation explained ET-1's synergistic potentiation of vasoconstriction.\",\n      \"evidence\": \"Isolated corpus cavernosum contraction with ETA blockade, Rho kinase inhibition, and RhoA membrane fractionation\",\n      \"pmids\": [\"12893655\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RhoGEF mediating translocation not identified here\", \"Generalizability to systemic vasculature untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placing ET-1 upstream of TNF-\\u03b1 established its causal role in triggering hepatopulmonary syndrome.\",\n      \"evidence\": \"ET-1 infusion in portal hypertensive rat models with HPS marker phenotyping\",\n      \"pmids\": [\"14715521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating TNF-\\u03b1 induction not defined\", \"Cellular source of TNF-\\u03b1 not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapping the ET-1 fibrotic program identified G\\u03b1i/PC-PLC/PLD-dependent collagen I and CTGF induction with ETA-to-ETB receptor switching during chronic stimulation.\",\n      \"evidence\": \"Pharmacological G-protein/phospholipase inhibition with Western blot and RT-PCR in dermal fibroblasts\",\n      \"pmids\": [\"16336267\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trigger for receptor subtype switching unknown\", \"Transcriptional mediators of CTGF biphasic kinetics not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying TGF-\\u03b2/ALK5/Smad3 as an ET-1 inducer revealed an autocrine ET-1 loop mediating TGF-\\u03b2's anti-migratory effects on endothelium.\",\n      \"evidence\": \"ALK5 inhibition and ET receptor antagonism in endothelial migration/proliferation assays\",\n      \"pmids\": [\"17376964\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Smad3 binding to edn1 promoter not shown\", \"Receptor subtype for autocrine effect not specified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Characterizing ETB-dependent autoregulation showed extracellular ET-1 suppresses its own mRNA via stability changes and ERK/p38 MAPK, defining a negative feedback loop.\",\n      \"evidence\": \"mRNA stability assays, RNA Pol II ChIP, and MAPK/receptor antagonists in porcine aortic endothelial cells\",\n      \"pmids\": [\"18278064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RNA-binding factors controlling mRNA stability not identified\", \"Physiological context where feedback dominates unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining the DHEA/PI3K-FoxO1 versus MAPK balance established opposing transcriptional control of ET-1 secretion in endothelium.\",\n      \"evidence\": \"ET-1 promoter luciferase reporter, PKA siRNA, and wortmannin/H89 inhibition with DHEA\",\n      \"pmids\": [\"18718910\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FoxO1 binding site on edn1 promoter not directly mapped\", \"In vivo relevance of DHEA control untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating HIF-1\\u03b1 occupancy of hypoxia response elements and aldosterone-driven MR/GR promoter binding established direct hypoxic and hormonal transcriptional control of EDN1.\",\n      \"evidence\": \"ChIP, promoter analysis, miRNA antagonism, and siRNA knockdown in liver endothelial and renal collecting duct cells\",\n      \"pmids\": [\"19783678\", \"19638349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interaction between hypoxic and hormonal inputs not examined\", \"Cell-type specificity of the responses not generalized\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linking ET-1 to vascular O-GlcNAcylation identified OGT-dependent reinforcement of RhoA/Rho-kinase contractile signaling.\",\n      \"evidence\": \"OGT siRNA and inhibitor with vascular contraction assays and RhoA pathway Western blots\",\n      \"pmids\": [\"20978008\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"O-GlcNAc target proteins driving RhoA activation not identified\", \"Reversibility/dynamics not characterized\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing a shift to VDCC-mediated Ca\\u00b2\\u207a entry after chronic hypoxia revealed pathologic remodeling of ET-1 Ca\\u00b2\\u207a signaling in pulmonary arterial smooth muscle.\",\n      \"evidence\": \"Fura-2 Ca\\u00b2\\u207a imaging with PKC, Rho kinase, and tyrosine kinase inhibitors\",\n      \"pmids\": [\"22387294\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis for loss of K\\u207a-channel coupling unknown\", \"Specific VDCC subtype not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying miR-648 targeting of the ET-1 3' UTR established a post-transcriptional brake on ET-1, itself under PlGF and PAX5 control.\",\n      \"evidence\": \"Luciferase 3' UTR reporters with mutant constructs, miRNA mimics, and PAX5 ChIP/gain-loss\",\n      \"pmids\": [\"25403488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context where miR-648 dominates not defined\", \"Quantitative contribution versus transcriptional control unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating ETA/PKA-mediated TRPA1 sensitization extended ET-1 function into nociception and mechanical hyperalgesia.\",\n      \"evidence\": \"Ca\\u00b2\\u207a imaging, electrophysiology, colocalization, and in vivo behavioral assays in sensory neurons\",\n      \"pmids\": [\"30990108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ETA\\u2013TRPA1 physical coupling not shown\", \"PKA phosphorylation site on TRPA1 not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing ET-1 suppresses Ca\\u00b2\\u207a-regulated K\\u207a currents revealed a PKC-dependent inhibition of melanoma migration.\",\n      \"evidence\": \"Patch-clamp recording, transwell migration, and pharmacological channel modulation\",\n      \"pmids\": [\"15083534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor subtype not specified\", \"Channel identity not molecularly defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Establishing SIRT1 deacetylation of NF-\\u03baB and PER1 repression defined negative regulatory nodes controlling ET-1-driven contraction and salt responses.\",\n      \"evidence\": \"Luciferase reporters, gain/loss-of-function, contraction assays, and in vivo CAS and PER1-KO models\",\n      \"pmids\": [\"33095054\", \"32437627\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interplay between circadian and inflammatory control of EDN1 not integrated\", \"NF-\\u03baB binding site fine-mapping incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying NRF1 as a direct hypoxic activator of EDN1, repressed by testosterone, added a sex-hormone-modulated transcriptional input.\",\n      \"evidence\": \"Promoter binding assays with in vivo rat hypoxia and testosterone manipulation\",\n      \"pmids\": [\"34257425\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NRF1 binding site sequence not resolved\", \"Relationship to HIF-1\\u03b1 input under hypoxia unexamined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linking EDN1 to oncogenic circuits revealed ARHGEF2/EDN1-driven HCC angiogenesis and an EDNRA/\\u03b2-arrestin/STAT3 positive feedback loop in colorectal cancer.\",\n      \"evidence\": \"Multi-omics, ChIP, promoter luciferase, and siRNA knockdown in tumor models\",\n      \"pmids\": [\"35896520\", \"36453252\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct STAT3 versus indirect promoter effects not fully separated\", \"Therapeutic generalizability across tumor types untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolving the Ang II \\u2192 Oct-1 \\u2192 NOX2 \\u2192 superoxide \\u2192 EDN1 promoter pathway established a redox-dependent transcriptional mechanism validated in vivo.\",\n      \"evidence\": \"siRNA, promoter deletion, EMSA, SOD treatment, and Nox2-KO mice\",\n      \"pmids\": [\"37381986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Superoxide-sensitive transcription factor at the promoter not fully defined\", \"Crosstalk with other Ang II effectors not addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapping a direct MasR:ETBR physical interaction defined the structural basis for vasoprotective Ang-(1-7)/ET-1 cross-talk and eNOS/NO signaling.\",\n      \"evidence\": \"Co-IP, peptide array binding mapping, eNOS/vascular contractility assays, and a mouse pulmonary hypertension model\",\n      \"pmids\": [\"39633565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural model of the heterodimer not resolved\", \"G-protein coupling consequences of dimerization not detailed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many transcriptional, post-transcriptional, and receptor-level regulatory inputs are integrated within a single cell type to set ET-1 output in physiology versus disease remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling competing HIF-1\\u03b1, NRF1, MR/GR, NF-\\u03baB, and miRNA inputs\", \"Receptor heterodimerization dynamics in native tissue uncharacterized\", \"Quantitative thresholds linking ET-1 levels to specific phenotypes undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [13, 2, 23]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [13, 3, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [6, 10, 12]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 3, 7, 4]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 22, 21, 20]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [13, 15, 7]}\n    ],\n    \"complexes\": [\"MasR:ETBR heterodimer\", \"ETB receptor homo-oligomer\"],\n    \"partners\": [\"EDNRA\", \"EDNRB\", \"MAS1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}