{"gene":"NOX1","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":1999,"finding":"NOX1 (originally Mox1) encodes a homologue of the catalytic subunit gp91phox of the phagocyte NADPH oxidase and generates superoxide in non-phagocytic cells; overexpression in NIH3T3 cells increases superoxide production, cell growth rate, anchorage-independent growth, and tumor formation in athymic mice, while antisense NOX1 decreases superoxide generation and serum-stimulated growth in smooth muscle cells.","method":"Overexpression and antisense inhibition in NIH3T3 and vascular smooth muscle cells; superoxide measurements; tumor formation assay in athymic mice","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays (overexpression, antisense, ROS measurement, tumorigenicity), foundational paper with >1200 citations","pmids":["10485709"],"is_preprint":false},{"year":2001,"finding":"H2O2 (derived from NOX1-generated superoxide via dismutation) acts as the key intracellular signal mediating NOX1-driven cell growth and transformation; co-expression of catalase with NOX1 reverses the transformed appearance, normalizes growth rate, prevents tumor formation, and restores >60% of NOX1-regulated genes to normal levels.","method":"Co-expression of human catalase with NOX1 in NIH3T3 cells; H2O2 and O2- measurements; gene expression profiling; tumor assays in athymic mice","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (ROS quantification, catalase rescue, gene expression, tumorigenicity) in single rigorous study","pmids":["11331784"],"is_preprint":false},{"year":2001,"finding":"NOX1 mediates the early phase of angiotensin II- and PDGF-induced superoxide production in vascular smooth muscle cells and is required for activation of the redox-sensitive signaling molecules p38 MAPK and Akt by Ang II; antisense NOX1 adenovirus completely inhibited this early superoxide phase and downstream redox signaling without affecting redox-independent pathways.","method":"Antisense adenoviral knockdown of NOX1 in VSMCs; superoxide measurement; Western blot for p38 MAPK and Akt phosphorylation","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal loss-of-function with specific signaling readouts, multiple agonists tested","pmids":["11348997"],"is_preprint":false},{"year":2002,"finding":"NOX1 requires cytosolic activator proteins to generate superoxide; two novel colon-enriched proteins NOXO1 (p47phox homologue, lacks autoinhibitory domain and PKC phosphorylation sites) and NOXA1 (p67phox homologue, lacks first SH3 domain, has hydrophobic stretch) were identified; co-expression of NOX1 with NOXO1 and NOXA1 leads to constitutive high-level superoxide generation, whereas replacing NOXO1 with p47phox restores stimulus-dependence.","method":"Co-expression of NOX1 with p47phox/p67phox or novel NOXO1/NOXA1 in heterologous cells; superoxide measurements; cDNA cloning","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of enzymatic activity with defined subunits and domain swap experiments","pmids":["12473664"],"is_preprint":false},{"year":2002,"finding":"NOX1-derived ROS trigger the angiogenic switch by markedly upregulating VEGF mRNA (in cultured cells and tumors) and inducing VEGFR1/VEGFR2 in vascular cells; matrix metalloproteinase activity is also induced; VEGF induction is abolished by catalase co-expression, implicating H2O2 as the signaling intermediate.","method":"NOX1 overexpression in DU-145 prostate cells; VEGF mRNA measurement; immunostaining of VEGF receptors in tumors; catalase co-expression; MMP activity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with catalase rescue establishing H2O2 as mediator","pmids":["11805326"],"is_preprint":false},{"year":2004,"finding":"Oncogenic Ras upregulates NOX1 expression via the MEK-MAPK pathway, and NOX1-generated ROS are required for Ras-induced transformation; siRNA knockdown of NOX1 blocks anchorage-independent growth, morphological transformation, and tumor formation in athymic mice caused by activated Ras.","method":"siRNA knockdown of NOX1 in Ras-transformed cells; MEK inhibitor; anchorage-independent growth assay; tumor formation in athymic mice","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — specific siRNA loss-of-function with multiple transformation phenotype readouts and pathway inhibition","pmids":["15150115"],"is_preprint":false},{"year":2004,"finding":"NOX1 activity in growth factor-stimulated cells is mediated by sequential activation of PI3K → βPix (a Rac GEF that constitutively associates with the C-terminal region of NOX1) → Rac1 (which binds to the C-terminal region of NOX1 in a growth factor-dependent manner); siRNA depletion of βPix blocks both Rac1 activation and ROS production.","method":"Co-immunoprecipitation of NOX1 C-terminal region with βPix and Rac1; siRNA knockdown of βPix and Nox1; ROS measurement; PI3K and other pathway inhibitors","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP establishing constitutive NOX1-βPix complex plus siRNA epistasis defining pathway order","pmids":["15121857"],"is_preprint":false},{"year":2004,"finding":"NOX1 physically associates with p22phox in vascular smooth muscle cells; co-immunoprecipitation and confocal colocalization demonstrate the two proteins are preassembled at the plasma membrane and submembrane areas in unstimulated cells, and NADPH-driven superoxide production depends on coexpression of both subunits.","method":"Co-immunoprecipitation of HA-tagged NOX1 with p22phox; confocal colocalization; ESR spin-probe measurement of NADPH-driven superoxide in cells expressing both subunits","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus colocalization plus functional reconstitution showing subunit dependence","pmids":["15477006"],"is_preprint":false},{"year":2005,"finding":"NOX1 is required for angiotensin II-induced superoxide production and the resultant pressor response in vivo; Nox1-knockout mice show significantly blunted blood pressure elevation and aortic superoxide production in response to Ang II, with preserved endothelium-dependent relaxation and cGMP levels, indicating NOX1-derived ROS reduce NO bioavailability to mediate hypertension.","method":"Nox1 knockout mice; Ang II infusion; telemetric blood pressure measurement; superoxide production in aorta; endothelium-dependent relaxation; cGMP measurement; L-NAME experiments","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout model with multiple vascular phenotype readouts, replicated in pharmacological experiments","pmids":["16246966"],"is_preprint":false},{"year":2007,"finding":"TNF treatment induces formation of a signaling complex containing TRADD, RIP1, NOX1, and the small GTPase Rac1 in mouse fibroblasts undergoing necrosis; RIP1 is essential for NOX1 recruitment to this complex; dominant-negative TRADD or Rac1 and NOX1 siRNA each prevent TNF-induced superoxide generation and necrotic cell death.","method":"Co-immunoprecipitation demonstrating TRADD/RIP1/NOX1/Rac1 complex; RIP1-deficient fibroblasts; dominant-negative mutants; NOX1 siRNA; superoxide measurement; cell death assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — complex identified by co-IP, validated by genetic deficiency and dominant-negative mutants with specific phenotypic readout","pmids":["17560373"],"is_preprint":false},{"year":2009,"finding":"The C-terminal cytosolic tail of NOX1 confers cytosolic subunit-dependent activation, while the N-terminal transmembrane portion determines plasma membrane localization and superoxide (vs. H2O2) release; Nox1 N-terminus is proteolytically cleaved; chimeric NOX1/NOX4 proteins reveal that a Nox4 cytosolic tail fused to Nox1 transmembrane domain renders NOX1 constitutively active.","method":"Chimeric NOX1/NOX4 constructs expressed in HEK293 cells; TIRF microscopy for subcellular localization; Myc-tag processing analysis; ROS measurements","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 1 — domain-swap mutagenesis with structure-function validation and live-cell imaging","pmids":["19061439"],"is_preprint":false},{"year":2009,"finding":"Tks4 and Tks5 (c-Src substrate proteins) are functional p47phox-related organizers that selectively support NOX1 (and NOX3) activity; Tks proteins interact with the NOXA1 activator through an SH3 domain-mediated interaction; endogenous Tks4 is required for Rac GTPase- and NOX1-dependent ROS production and for NOX1 recruitment to invadopodia in DLD1 colon cancer cells.","method":"Reconstituted cellular systems; co-immunoprecipitation (Tks-NoxA1 SH3 interaction); siRNA knockdown of Tks4; ROS measurement; invadopodia formation assay","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — protein interaction defined by SH3-domain mechanism, validated by endogenous knockdown with specific cellular phenotype","pmids":["19755710"],"is_preprint":false},{"year":2010,"finding":"LRRC8A (a component of volume-regulated anion channels) co-localizes with and co-immunoprecipitates with NOX1 and its p22phox subunit in vascular smooth muscle cells; LRRC8A siRNA suppresses TNFα-induced extracellular superoxide production by NOX1, TNFR1 endocytosis, and JNK phosphorylation; extracellular superoxide (not H2O2) is the critical oxidant enabling TNFR1 endocytosis.","method":"Co-immunoprecipitation; siRNA knockdown; VRAC inhibitor; extracellular SOD/catalase discrimination; TNFR1 endocytosis assay; JNK phosphorylation","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP establishing complex membership plus siRNA loss-of-function with specific signaling readouts","pmids":["27838438"],"is_preprint":false},{"year":2010,"finding":"TNFα-induced NOX1 activation in smooth muscle cells requires dynamin-dependent receptor endocytosis, whereas thrombin-mediated NOX1 activation occurs outside endosomes and requires EGFR transactivation; both pathways converge on PI3K-Akt-ATF-1 signaling in a NOX1- and dynamin-dependent manner.","method":"NOX1 shRNA; dominant-negative dynamin; endosomal ROS measurement; EGFR transactivation assay; PI3K-Akt-ATF-1 pathway analysis","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 2 — shRNA loss-of-function combined with dominant-negative and pharmacological tools defining spatial compartmentalization of NOX1 activation","pmids":["19737091"],"is_preprint":false},{"year":2010,"finding":"NOX1 upregulates EGFR and TGF-α expression through an Src-ERK positive feedback loop and a parallel p38 MAPK-AKT pathway, driving autocrine growth of liver tumor cells; NOX1 knockdown reduces EGFR/TGF-α mRNA and EGFR phosphorylation, and antioxidants or NADPH oxidase inhibition attenuates autocrine growth.","method":"NOX1 siRNA; antioxidants; pharmacological NADPH oxidase inhibition; EGFR/TGF-α mRNA and protein measurement; EGFR phosphorylation; pathway inhibitors","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal loss-of-function approaches with specific molecular readouts defining the pathway","pmids":["20525691"],"is_preprint":false},{"year":2010,"finding":"NOX1-derived ROS promote invadopodia formation (extracellular matrix-degrading actin-rich structures) in human colon cancer cells; the selective NOX1 small-molecule inhibitor ML171 (2-acetylphenothiazine) blocks NOX1-dependent ROS generation and invadopodia formation at nanomolar concentrations with selectivity over other NOX isoforms; NOX1 overexpression rescues ML171 inhibition, confirming selectivity.","method":"High-throughput screening; ML171 pharmacological inhibition; NOX1 overexpression rescue; invadopodia assay; isoform selectivity panel","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 2 — specific inhibitor validated by rescue overexpression, selective isoform profiling, and defined cellular phenotype","pmids":["20715845"],"is_preprint":false},{"year":2011,"finding":"Annexin A1 (ANXA1) activates epithelial NOX1 through formyl peptide receptor 1 (FPR1) signaling; NOX1-derived ROS oxidatively inactivate phosphatases PTEN and PTP-PEST, leading to activation of FAK and paxillin, thereby promoting epithelial cell migration and mucosal wound repair; intestinal epithelial-specific Nox1 knockout mice show defects in mucosal wound repair.","method":"Intestinal epithelial-specific Nox1 knockout mice; ANXA1 administration; phosphatase activity (PTEN, PTP-PEST); FAK and paxillin activation; cell migration assay; in vivo wound repair","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific knockout with defined molecular mechanism (phosphatase oxidation → FAK/paxillin) and in vivo phenotype","pmids":["23241962"],"is_preprint":false},{"year":2012,"finding":"DNA damage-induced ROS generation is mediated through the H2AX-NOX1/Rac1 pathway; H2AX overexpression or NCS-induced DNA damage increases NOX1 activity partly by reducing the interaction between the NOX1 activator NOXA1 and its inhibitor 14-3-3ζ; NOX1 knockdown (but not NOX4) reduces ROS and cell death induced by H2AX accumulation.","method":"siRNA knockdown of NOX1 and NOX4; dominant-negative Rac1; NADPH oxidase inhibitor DPI; ROS measurement; co-immunoprecipitation (NOXA1/14-3-3ζ interaction); cell death assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — mechanistic pathway defined by specific knockdowns plus co-IP identifying regulatory interaction of NOXA1/14-3-3ζ","pmids":["22237206"],"is_preprint":false},{"year":2012,"finding":"In rat REF52 cells, oncogenic Ras upregulates NOX1 through the Ras/MEK pathway to increase intracellular ROS, which transduce senescence signals activating the p53 and p16Ink4a pathways; NOX1 siRNA blocks Ras-induced senescence (β-galactosidase activity, growth arrest), DNA damage response, and p38MAPK activation; this is confirmed in Nox1 knockout mouse embryo fibroblasts.","method":"siRNA knockdown of NOX1; Nox1 knockout MEFs; senescence markers (β-gal, p53, p16); DNA damage assay; p38 MAPK phosphorylation; MEK inhibitor","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 — genetic KO corroborates siRNA data; pathway placement (Ras/MEK → NOX1 → ROS → p53/p16 → senescence) established with multiple readouts","pmids":["23216904"],"is_preprint":false},{"year":2014,"finding":"Protein kinase C-β1 phosphorylates NOX1 at threonine 429 in response to TNFα; this phosphorylation facilitates association of NOX1 with the NoxA1 activation domain, is necessary for NADPH oxidase complex assembly, ROS production, and vascular smooth muscle cell migration; PKCβ1 siRNA abolishes TNFα-mediated ROS production and VSMC migration.","method":"Mass spectrometry identifying phosphorylation site; PKCβ1 inhibitor and siRNA; site-directed mutagenesis (T429A); isothermal titration calorimetry (NOX1/NoxA1 interaction); ROS measurement; VSMC migration assay","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1 — phosphorylation site identified by MS, validated by mutagenesis, interaction quantified by ITC, and functional consequence demonstrated","pmids":["25228390"],"is_preprint":false},{"year":2016,"finding":"Peroxiredoxin 6 (Prdx6) is a novel binding partner of NOXA1, identified by yeast two-hybrid using the NOXA1 SH3 domain as bait; Prdx6 binds to and stabilizes NOXA1 via SH3 domain interaction; both the peroxidase (C47S) and phospholipase A2 (S32A) activities of Prdx6 are required for NOX1 activation and NOX1-mediated cell migration; the PLA2 transition-state inhibitor MJ-33 suppresses NOX1 activity.","method":"Yeast two-hybrid; co-immunoprecipitation; Prdx6 knockdown and overexpression; enzymatic mutants (C47S, S32A); MJ-33 inhibitor; superoxide measurement; cell migration assay","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 — interaction discovered by yeast two-hybrid, confirmed by co-IP, validated with enzymatic mutants and specific inhibitor, with functional readout","pmids":["27094494"],"is_preprint":false},{"year":2016,"finding":"CRISPR/Cas9-mediated knockout of p22phox (CYBA) abolishes NOX1 (and NOX4) activity but not NOX5 activity; p22phox is required for maturation and activity of NOX1; rescue with human or rat p22phox, but not DUOXA1/A2, restores NOX1-dependent superoxide production.","method":"CRISPR/Cas9 knockout; reconstitution with human/rat p22phox and DUOXA1/A2; ROS measurements (H2O2 and superoxide); multiple p22phox mutation analysis","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 — CRISPR-mediated knockout with reconstitution experiments establishing p22phox as an essential NOX1 maturation factor","pmids":["27614387"],"is_preprint":false},{"year":2017,"finding":"NOX1-derived ROS in the ventral tegmental area (VTA) mediate depressive-like behaviors by oxidizing NMDA receptor subunit NR1 (at C744); NOX1-derived ROS suppress NMDA-induced BDNF upregulation in cortical neurons via NR1 oxidation; NR1 C744A mutant is resistant to H2O2-mediated suppression of BDNF; redox proteomics identified NR1 as the NOX1 target.","method":"Nox1 knockout mice; miRNA delivery to VTA; chronic social defeat stress and corticosterone models; redox proteome analysis; cortical neuron culture with H2O2 and NR1 C744A mutant; BDNF mRNA and DNA methylation measurements","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic KO, region-specific miRNA knockdown, redox proteomics, and mutagenesis (NR1 C744A) together define molecular target of NOX1-derived ROS","pmids":["28314819"],"is_preprint":false},{"year":2013,"finding":"NOX1 is required for normal apoptosis of pulmonary arterial smooth muscle cells (PASMCs) through regulation of the voltage-gated K+ channel Kv1.5 and intracellular potassium levels; Nox1-deficient mice develop spontaneous pulmonary vascular remodeling with reduced PASMC apoptosis and decreased Kv1.5 protein; re-expression of rat NOX1 transgene in knockout mice rescues impaired apoptosis and Kv1.5 levels.","method":"Nox1 knockout mice; Nox1 transgene rescue; flow cytometry and TUNEL for apoptosis; Kv1.5 protein measurement; intracellular potassium measurement","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with transgene rescue establishing NOX1 → Kv1.5 → K+ → apoptosis pathway","pmids":["24233492"],"is_preprint":false},{"year":2011,"finding":"NOX1 mediates morphine-induced analgesic tolerance by attenuating opioid pharmacology; Nox1-deficient mice show augmented morphine analgesia and suppressed tolerance; NOX1-derived ROS regulate GTPase activity in the dorsal spinal cord, impair G-protein coupling, promote PKC isoform membrane translocation, enhance RGS9-2 phosphorylation, and facilitate Gαi2/RGS9-2/14-3-3 complex formation.","method":"Nox1 knockout mice; [35S]GTPγS binding; morphine-stimulated GTPase activity; PKC membrane translocation assay; RGS9-2 phosphorylation; co-immunoprecipitation (Gαi2/RGS9-2/14-3-3)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple biochemical readouts defining a specific molecular mechanism for NOX1 in opioid tolerance","pmids":["22159121"],"is_preprint":false},{"year":2007,"finding":"STAT1 and STAT3 directly bind to GAS elements in the NOX1 promoter (demonstrated by chromatin immunoprecipitation) and transactivate NOX1 expression in human vascular smooth muscle cells; JAK/STAT pathway regulates IFNγ-induced NOX1 activity; JAK/STAT blockade reduces NOX1 subunit transcription.","method":"Chromatin immunoprecipitation; promoter-luciferase assays; STAT1/STAT3 overexpression; JAK/STAT inhibitors; NOX activity measurement","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — ChIP establishing physical STAT-NOX1 promoter interaction plus functional validation with overexpression and inhibitors","pmids":["19834108"],"is_preprint":false},{"year":2007,"finding":"MEF2B transcription factor binds to a consensus MEF2 site in the NOX1 promoter (-146 to -125) in response to prostaglandin F2α; MEF2B is downstream of ATF-1 in a PGF2α/PDGF-induced cascade (ATF-1→MEF2B→NOX1); MEF2B siRNA suppresses NOX1 expression and reduces VSMC superoxide production.","method":"Promoter deletion analysis; MEF2 site binding; MEF2B siRNA; ATF-1 siRNA; RT-PCR of NOX1; superoxide assay in VSMCs","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 — promoter mapping with siRNA epistasis defining transcriptional pathway for NOX1 regulation","pmids":["17822438"],"is_preprint":false},{"year":2007,"finding":"Nox1, together with its partner proteins NOXO1 and NOXA1, is localized predominantly to the Golgi apparatus in human gastric adenocarcinoma cells (intestinal-type, diffuse-type, and signet-ring cell carcinoma), with nuclear localization also observed in diffuse-type; co-expression of Nox1, NOXO1, NOXA1, and p22phox is specific to gastric cancer cells and absent from normal gastric mucosa.","method":"Immunohistochemistry; confocal microscopy showing subcellular localization; immunofluorescence","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization experiment in disease tissue without functional perturbation of the complex","pmids":["18037128"],"is_preprint":false},{"year":2007,"finding":"NOX1 overexpression induces genome instability; co-expression of NOX1 with NOXO1 and NOXA1 in HeLa cells increases 8-oxoguanine levels and causes a 3-fold increase in HPRT mutation rate, without upregulating DNA repair enzymes, suggesting ROS-mediated saturation of repair capacity.","method":"Co-expression of hNOX1/NOXO1/NOXA1 in HeLa cells; ROS measurement; 8-oxoguanine quantification; HPRT mutation rate; repair enzyme expression analysis","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — reconstituted enzymatic complex with specific genotoxic readout; single lab study","pmids":["17963706"],"is_preprint":false},{"year":2010,"finding":"NOX1 inhibits p53 proapoptotic transcriptional activity and p53 Lys382 acetylation through a SIRT1-dependent mechanism; NOX1 activates SIRT1 deacetylase activity, and SIRT1 deacetylase-defective mutant (SIRT1HY) renders cells unresponsive to NOX1-dependent inhibition of p53; recovery of HIPK2 function downregulates NOX1 and rescues p53 Lys382 acetylation.","method":"siRNA knockdown of NOX1 and SIRT1; SIRT1 inhibitor nicotinamide; SIRT1HY deacetylase-dead mutant; p53 Lys382 acetylation and transcriptional activity assays; HIPK2 rescue experiment","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — multiple complementary genetic and pharmacological approaches; single lab","pmids":["20171273"],"is_preprint":false},{"year":2014,"finding":"NOX1 is the key NADPH oxidase regulating GPVI-dependent ROS production in platelets; pharmacological inhibition of NOX1 with ML171 blocks GPVI (collagen-related peptide)-induced ROS, thromboxane A2 production (via p38 MAPK signaling), and reduces collagen-mediated thrombus formation at arterial shear in ex vivo perfusion; Nox2-deficient mice confirm NOX1 specificity for this pathway.","method":"ML171 pharmacological inhibition; Nox2-deficient mice; p38 MAPK inhibition; TxA2 measurement; platelet aggregation assay; ex vivo perfusion thrombus model","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological + genetic (Nox2 KO) dissection of isoform-specific platelet signaling; single lab","pmids":["24494191"],"is_preprint":false},{"year":2016,"finding":"NOX1 directly interacts with and stabilizes ADAM17 (TACE) from ubiquitin-mediated degradation; NOX1 overexpression activates the ADAM17-EGFR-PI3K-AKT signaling pathway to promote colon cancer cell migration and invasion; co-immunoprecipitation demonstrates the NOX1-ADAM17 physical interaction.","method":"Co-immunoprecipitation; NOX1 overexpression; ADAM17 ubiquitination assay; EGFR-PI3K-AKT pathway Western blot; migration/invasion assay","journal":"European review for medical and pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 3 — single co-IP with functional overexpression studies; single lab","pmids":["27874952"],"is_preprint":false},{"year":2021,"finding":"NOX1-derived ROS mediate colonic stem cell (CSC) proliferation through redox-dependent activation of EGFR signaling; NOX1 expression is CSC-specific and restricted to proliferating CSCs; in the absence of NOX1, CSCs fail to generate ROS and have reduced proliferation; NOX1 expression is regulated by Toll-like receptor activation in response to the microbiota, establishing a TLR-NOX1-EGFR axis.","method":"NOX1 knockout colonoids and mice; single-cell ROS measurement; EGFR signaling readout; TLR stimulation; CSC-specific NOX1 expression analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — NOX1 knockout with multiple orthogonal readouts defining TLR→NOX1→EGFR signaling axis in stem cells","pmids":["33826887"],"is_preprint":false},{"year":2022,"finding":"Renal NOXA1-dependent NOX1 activity is required for Ang II-induced upregulation of epithelial sodium channel (ENaC) in collecting duct principal cells and sodium retention; Noxa1 knockout mice show attenuated Ang II-induced hypertension and impaired ENaC activation; aldosterone induces ROS and Noxa1/Scnn1a expression and ENaC activity through NOXA1-NOX1, abolished by Noxa1 siRNA.","method":"Noxa1 knockout mice; telemetric blood pressure; ENaC activity measurement; Na+ excretion assay; Noxa1 siRNA in renal epithelial cells; ROS measurement","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 2 — genetic KO and siRNA defining NOXA1/NOX1-ENaC-sodium retention pathway with in vivo and in vitro validation","pmids":["34714114"],"is_preprint":false},{"year":2021,"finding":"NOX1-derived ROS drive spermatogonial stem cell (SSC) self-renewal under normoxia through a ROS-BCL6B-NOX1 feed-forward pathway; under hypoxia, NOX1-derived (not mitochondrial) ROS influence HIF1A expression in undifferentiated spermatogonia; Nox1-deficient SSCs proliferate poorly under hypoxia but normally under normoxia; CDKN1A depletion rescues impaired Nox1-deficient SSC proliferation under hypoxia.","method":"Nox1 knockout mice and SSC cultures; normoxia/hypoxia conditions; BCL6B expression; HIF1A measurement; CDKN1A siRNA rescue; mitochondrial ROS suppression","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple rescue experiments defining NOX1 pathway in stem cell self-renewal under defined oxygen conditions","pmids":["33446567"],"is_preprint":false},{"year":2019,"finding":"NF-κB directly regulates NOXO1 expression in TNF-α-stimulated gastric cancer cells, activating the NOX1 complex; NOX1/ROS signaling increases proliferation of gastric epithelial cells and expands SOX2-positive undifferentiated epithelial stem cells; disruption of Noxo1 in gastritis mouse model suppresses metaplastic hyperplasia and reduces SOX2-positive cells.","method":"NF-κB inhibition and overexpression; NOXO1 promoter analysis; Noxo1 knockout in K19-C2mE mice; in situ hybridization; SOX2 immunostaining; gastric hyperplasia histology","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — genetic disruption in mouse model plus promoter mechanism establishing NF-κB→NOXO1→NOX1 pathway in gastric tumorigenesis","pmids":["30700829"],"is_preprint":false},{"year":2004,"finding":"Helicobacter pylori LPS activates NOX1 in gastric mucosal cells through two distinct events: transcriptional upregulation of Nox1 and NOXO1 mRNAs, and activation of Rac1 (GTP-bound state) via PI3K; a constitutively active Rac1 adenovirus (but not Cdc42) restores PI3K inhibitor-blocked superoxide generation, establishing Rac1 as an essential NOX1 activator.","method":"Primary guinea pig gastric mucosal cells; Rac1 GTP-loading assay; adenoviral constitutively active Rac1/Cdc42; PI3K inhibitor LY294002; actinomycin D and cycloheximide blocking; superoxide measurement","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 — epistasis established by constitutively active Rac1 rescue plus pathway inhibitors; multiple complementary approaches","pmids":["15469954"],"is_preprint":false},{"year":2015,"finding":"NOX1 missense variants p.Pro330Ser and p.Asp360Asn found in VEOIBD patients show reduced ROS production compared to wild-type NOX1 despite appropriate cellular localization; cells harboring these variants have defective host resistance to Campylobacter jejuni infection, establishing that NOX1 ROS generation is required for epithelial innate defense.","method":"Sanger sequencing; ROS generation assay in model cell lines and murine crypts; cellular localization assessment; pathogen infection assay (C. jejuni, EPEC); structural homology modeling","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"High","confidence_rationale":"Tier 2 — patient-derived loss-of-function variants functionally characterized with ROS and infection assays establishing structure-function relationship","pmids":["26301257"],"is_preprint":false},{"year":2007,"finding":"The NOX1 promoter region contains a GATA-4/5/6 binding element and overlapping sites for Cdx1/Cdx2 and HNF-1α; these factors show cooperativity in transactivating the NOX1 promoter; GATA-6, HNF-1α, and Cdx2 bind to this chromatin region in CaCo2 cells; their expression gradients in mouse colon parallel the distal-to-proximal NOX1 gradient.","method":"Promoter-luciferase deletion analysis; in vitro DNA binding; chromatin immunoprecipitation in CaCo2 cells; transcription factor co-transfection cooperativity assay; NOX1 expression gradient analysis in normal and germ-free mice","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 — ChIP establishing physical occupancy of identified TFs at NOX1 promoter in intact chromatin, corroborated by cooperativity and in vivo expression data","pmids":["18005670"],"is_preprint":false},{"year":2011,"finding":"NOX1 is expressed in hepatic stellate cells (HSCs) but not Kupffer cells; NOX1 mediates profibrogenic effects in endogenous liver cells; NOX1-deficient HSCs show decreased ROS generation and fail to upregulate collagen α1(I) and TGF-β in response to angiotensin II; bone marrow chimera experiments confirm that NOX1 acts in endogenous liver cells rather than bone marrow-derived cells.","method":"Nox1 knockout mice; CCl4 and bile duct ligation hepatic fibrosis models; bone marrow chimeras; HSC and Kupffer cell isolation; ROS generation; collagen/TGF-β measurement","journal":"Hepatology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 — genetic KO combined with bone marrow chimeras providing cellular resolution of NOX1 function in hepatic fibrosis","pmids":["21384410"],"is_preprint":false}],"current_model":"NOX1 is a superoxide-generating NADPH oxidase that forms a multi-protein complex with the membrane subunit p22phox, cytosolic organizers NOXO1 (or Tks4/Tks5) and activator NOXA1, and the small GTPase Rac1; its enzymatic activity is stimulated by upstream signals (growth factors, Ang II, TNFα, TLRs) acting through PI3K→βPix→Rac1, and is regulated post-translationally by PKCβ1-mediated phosphorylation of Thr429 (which controls NoxA1 docking) and by NOXA1 stabilization via Prdx6; the resulting extracellular superoxide and intracellular H2O2 function as second messengers that inactivate phosphatases (PTEN, PTP-PEST), activate EGFR/MAPK/AKT/NF-κB pathways, oxidize NMDA receptor NR1, regulate Kv1.5 channel abundance, and control ENaC-mediated Na+ reabsorption, collectively mediating cell proliferation, migration, wound repair, vascular tone, stem cell self-renewal, and necrotic cell death downstream of TNFα-RIP1 signaling."},"narrative":{"teleology":[{"year":1999,"claim":"Identification of NOX1 as a non-phagocytic gp91phox homologue established that dedicated NADPH oxidases exist outside immune cells and that their superoxide output drives mitogenic signaling and transformation.","evidence":"Overexpression/antisense in NIH3T3 and VSMCs with superoxide measurement and tumorigenicity assays","pmids":["10485709"],"confidence":"High","gaps":["Accessory subunits not yet identified","Endogenous physiological stimuli undefined","In vivo relevance unconfirmed"]},{"year":2001,"claim":"Demonstrating that H₂O₂ (from superoxide dismutation) is the actual intracellular second messenger resolved whether superoxide or its derivative mediates NOX1 downstream signaling, and separately established that NOX1 mediates Ang II- and PDGF-induced redox signaling to p38 MAPK and Akt in vascular smooth muscle cells.","evidence":"Catalase co-expression reversing transformation and gene expression; antisense adenoviral knockdown blocking Ang II-induced signaling in VSMCs","pmids":["11331784","11348997"],"confidence":"High","gaps":["The cytosolic activator subunits required for NOX1 enzymatic activity were still unknown","Source of vascular ROS in vivo not yet demonstrated genetically"]},{"year":2002,"claim":"Discovery of the dedicated organizer NOXO1 and activator NOXA1 — distinct from phagocyte p47phox/p67phox — explained why NOX1 can be constitutively active and defined the minimal subunit complement for reconstituted activity.","evidence":"cDNA cloning plus reconstitution: co-expression of NOX1/NOXO1/NOXA1 yields constitutive superoxide; domain-swap with p47phox restores stimulus-dependence","pmids":["12473664"],"confidence":"High","gaps":["Role of small GTPases in the complex not yet defined","p22phox requirement for NOX1 not formally demonstrated"]},{"year":2004,"claim":"Three converging studies established: (1) oncogenic Ras upregulates NOX1 via MEK-MAPK and NOX1 is required for Ras transformation; (2) PI3K→βPix→Rac1 constitutes the upstream activation cascade linking growth factors to NOX1; (3) p22phox physically associates with NOX1 at the plasma membrane and is required for superoxide output; and (4) bacterial LPS activates NOX1 via transcriptional upregulation plus Rac1-GTP loading.","evidence":"siRNA knockdown blocking Ras transformation; reciprocal co-IP of NOX1-βPix-Rac1 with siRNA epistasis; co-IP and confocal colocalization of NOX1-p22phox; Rac1 GTP-loading and CA-Rac1 rescue in gastric cells","pmids":["15150115","15121857","15477006","15469954"],"confidence":"High","gaps":["Post-translational regulation of NOX1 itself not identified","In vivo vascular phenotype of Nox1 loss not yet tested"]},{"year":2005,"claim":"Genetic loss-of-function in vivo demonstrated that NOX1 is required for angiotensin II-induced superoxide production and hypertension, establishing NOX1 as a mediator of vascular tone through reduction of NO bioavailability.","evidence":"Nox1 knockout mice with telemetric blood pressure, aortic superoxide measurement, endothelium-dependent relaxation, and cGMP assays","pmids":["16246966"],"confidence":"High","gaps":["Renal contribution of NOX1 to blood pressure not separated from vascular contribution","Downstream ion channel targets unknown"]},{"year":2007,"claim":"Multiple 2007 studies expanded the mechanistic picture: NOX1 was placed in a TNFα-induced necrosis complex with TRADD/RIP1/Rac1; transcriptional regulation was mapped to STAT1/3 (GAS elements), MEF2B (ATF-1 cascade), and GATA/Cdx/HNF-1α cooperativity at the promoter; NOX1 overexpression was shown to cause genome instability.","evidence":"Co-IP of TRADD/RIP1/NOX1/Rac1 complex validated by RIP1 deficiency; ChIP of STAT1/3 at NOX1 promoter; promoter deletion/ChIP for GATA-6/Cdx2/HNF-1α; mutagenesis rate assay","pmids":["17560373","19834108","17822438","18005670","17963706"],"confidence":"High","gaps":["Post-translational activation mechanism of NOX1 by TNFα not defined","NOX1 role in epithelial innate defense not yet examined"]},{"year":2009,"claim":"Domain-swap chimeras between NOX1 and NOX4 revealed that the N-terminal transmembrane region dictates plasma membrane targeting and superoxide (vs. H₂O₂) release, while the C-terminal cytosolic tail confers subunit-dependent activation; separately, Tks4/Tks5 were identified as alternative NOX1 organizers that recruit NOX1 to invadopodia.","evidence":"NOX1/NOX4 chimeric constructs with TIRF microscopy and ROS measurement; Tks4 siRNA blocking invadopodia-localized ROS in DLD1 cells","pmids":["19061439","19755710"],"confidence":"High","gaps":["Structural basis for subunit selectivity unresolved","Whether Tks and NOXO1 compete or cooperate in vivo unclear"]},{"year":2010,"claim":"Studies in 2010–2011 defined compartmentalized NOX1 activation (dynamin-dependent endosomal for TNFα vs. plasma membrane EGFR-transactivation for thrombin), established EGFR/TGF-α positive feedback, identified NOX1's role in hepatic stellate cell fibrosis, and revealed that NOX1 modulates opioid signaling and analgesic tolerance in dorsal spinal cord.","evidence":"Dominant-negative dynamin and shRNA defining compartmentalized signaling; NOX1 siRNA reducing EGFR/TGF-α autocrine loop; Nox1 KO with bone marrow chimeras in fibrosis models; Nox1 KO mice with GTPase/PKC/RGS9-2 biochemistry in morphine tolerance","pmids":["19737091","20525691","21384410","22159121"],"confidence":"High","gaps":["Direct phosphorylation events on NOX1 controlling activation unknown","Mechanism of NOX1-mediated SIRT1 activation only partially defined"]},{"year":2012,"claim":"NOX1 was linked to Ras-induced cellular senescence (via p53/p16Ink4a) and to DNA damage-induced ROS through an H2AX–NOXA1/14-3-3ζ regulatory mechanism, expanding NOX1's role beyond proliferation to include growth-arrest and DNA-damage responses.","evidence":"Nox1 KO MEFs and siRNA blocking Ras-induced senescence markers; co-IP showing H2AX-dependent release of NOXA1 from 14-3-3ζ inhibition","pmids":["23216904","22237206"],"confidence":"High","gaps":["Whether senescence vs. transformation outcome depends on ROS threshold not established","NOXA1 phosphorylation site(s) controlling 14-3-3ζ binding not mapped"]},{"year":2013,"claim":"Intestinal epithelial-specific and pulmonary studies revealed NOX1 controls mucosal wound repair by oxidizing phosphatases PTEN/PTP-PEST to activate FAK/paxillin, and separately regulates pulmonary artery smooth muscle cell apoptosis through Kv1.5 channel stabilization, with transgene rescue confirming specificity.","evidence":"Intestinal epithelial-specific Nox1 KO with in vivo wound repair and phosphatase activity assays; Nox1 KO mice with transgene rescue, Kv1.5 protein and apoptosis measurements","pmids":["23241962","24233492"],"confidence":"High","gaps":["How NOX1-derived ROS stabilize Kv1.5 protein is mechanistically unclear","Whether phosphatase oxidation is a universal NOX1 signaling mechanism across tissues untested"]},{"year":2014,"claim":"Identification of PKCβ1-mediated phosphorylation of NOX1 at Thr429 as required for NOXA1 docking provided the first direct post-translational regulatory mechanism on the NOX1 catalytic subunit itself.","evidence":"Mass spectrometry phosphosite identification; T429A mutagenesis; ITC measuring NOX1–NOXA1 binding affinity; PKCβ1 siRNA abolishing TNFα-induced ROS and VSMC migration","pmids":["25228390"],"confidence":"High","gaps":["Whether additional phosphorylation sites exist on NOX1 not surveyed","Crystal/cryo-EM structure of the NOX1 complex unavailable"]},{"year":2015,"claim":"Patient-derived NOX1 missense variants (P330S, D360N) causing reduced ROS production and impaired epithelial defense against Campylobacter jejuni linked NOX1 loss-of-function to very-early-onset inflammatory bowel disease.","evidence":"Sanger sequencing of VEOIBD patients; ROS assay in model cells and murine crypts; pathogen infection assay","pmids":["26301257"],"confidence":"High","gaps":["Penetrance and genetic modifiers in VEOIBD families not established","Whether NOX1 variants affect microbiome composition not examined"]},{"year":2016,"claim":"CRISPR knockout of p22phox confirmed its absolute requirement for NOX1 maturation and activity, Prdx6 was identified as a NOXA1 stabilizer whose dual enzymatic activities are needed for NOX1 activation, and NOX1 was shown to stabilize ADAM17 from ubiquitin-mediated degradation to promote EGFR-PI3K-AKT signaling.","evidence":"CRISPR KO of CYBA with reconstitution; yeast two-hybrid identifying Prdx6-NOXA1 interaction validated by co-IP and enzymatic mutants; co-IP of NOX1-ADAM17 with ubiquitination assay","pmids":["27614387","27094494","27874952"],"confidence":"High","gaps":["How Prdx6 PLA2 activity mechanistically supports NOX1 activation is unclear","ADAM17 interaction awaits reciprocal validation"]},{"year":2017,"claim":"Redox proteomics identified NMDA receptor subunit NR1 oxidation at C744 as the molecular target by which NOX1-derived ROS suppress BDNF in cortical neurons and mediate depressive-like behavior, extending NOX1 function to CNS redox signaling.","evidence":"Nox1 KO mice; VTA-targeted miRNA knockdown; redox proteome analysis; NR1 C744A mutagenesis rescuing BDNF suppression","pmids":["28314819"],"confidence":"High","gaps":["Whether NOX1 oxidizes other neuronal substrates not surveyed","Cell-type-specific NOX1 expression in brain not fully mapped"]},{"year":2021,"claim":"NOX1 was established as a critical driver of stem cell self-renewal: colonic stem cell proliferation depends on TLR-activated NOX1–EGFR signaling, and spermatogonial stem cells require NOX1-derived ROS for a BCL6B–NOX1 feed-forward loop under normoxia and HIF1A regulation under hypoxia.","evidence":"NOX1 KO colonoids and mice with single-cell ROS and EGFR readouts; Nox1 KO SSC cultures under normoxia/hypoxia with BCL6B/HIF1A/CDKN1A epistasis","pmids":["33826887","33446567"],"confidence":"High","gaps":["Whether NOX1 governs stem cell fate in other tissues unknown","Direct ROS targets in colonic stem cells not identified"]},{"year":2022,"claim":"Renal NOXA1-NOX1 activity was shown to be required for aldosterone/Ang II-induced ENaC activation and sodium retention, providing a molecular link between NOX1 and electrolyte homeostasis in collecting duct principal cells.","evidence":"Noxa1 KO mice with telemetric blood pressure, ENaC activity, and Na⁺ excretion; Noxa1 siRNA in renal epithelial cells","pmids":["34714114"],"confidence":"High","gaps":["Whether NOX1 regulates other renal ion transporters not examined","Direct ROS target linking NOX1 to ENaC trafficking or gating undefined"]},{"year":null,"claim":"Despite extensive functional characterization, the atomic-resolution structure of the NOX1 holoenzyme complex has not been determined, the full repertoire of direct oxidation targets (beyond PTEN, PTP-PEST, NR1) is unknown, and the mechanisms deciding whether NOX1-derived ROS drive proliferation versus senescence versus necrosis in a given cellular context remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No cryo-EM or crystal structure of the NOX1 complex","Threshold or compartmentalization rules governing divergent cell-fate outcomes not defined","Relative contributions of NOXO1 vs. Tks4/Tks5 organizers in vivo not genetically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,3,7,8,10,21]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,3,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7,10]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[27]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,6,14,16,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[37,36]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,23]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,7]}],"complexes":["NOX1-p22phox-NOXO1-NOXA1-Rac1 complex","TRADD-RIP1-NOX1-Rac1 necrosis complex"],"partners":["CYBA","NOXO1","NOXA1","RAC1","ARHGEF7","PRDX6","SH3PXD2A","SH3PXD2B"],"other_free_text":[]},"mechanistic_narrative":"NOX1 is a superoxide-generating NADPH oxidase that functions as a catalytic core of a multi-subunit complex to produce reactive oxygen species (ROS) serving as second messengers in cell proliferation, migration, vascular tone regulation, innate epithelial defense, and stem cell self-renewal. The active complex requires the membrane partner p22phox for maturation and activity, cytosolic organizers NOXO1 (or Tks4/Tks5), the activator NOXA1, and the small GTPase Rac1, which is recruited via PI3K→βPix signaling; PKCβ1 phosphorylation of NOX1 at Thr429 controls NOXA1 docking and complex assembly [PMID:12473664, PMID:15477006, PMID:27614387, PMID:15121857, PMID:25228390]. NOX1-derived superoxide is dismutated to H₂O₂, which oxidatively inactivates phosphatases PTEN and PTP-PEST to activate FAK-dependent migration, drives EGFR/MAPK/AKT signaling cascades promoting proliferation and transformation, and oxidizes NMDA receptor NR1 at C744 to modulate neuronal BDNF expression [PMID:11331784, PMID:23241962, PMID:20525691, PMID:28314819]. In vivo, Nox1 deficiency attenuates angiotensin II-induced hypertension by preserving NO bioavailability, impairs mucosal wound repair, reduces pulmonary arterial smooth muscle cell apoptosis through loss of Kv1.5 channel regulation, and compromises colonic stem cell proliferation downstream of TLR–EGFR signaling; loss-of-function NOX1 variants are associated with very-early-onset inflammatory bowel disease and defective epithelial antimicrobial defense [PMID:16246966, PMID:23241962, PMID:24233492, PMID:33826887, PMID:26301257]."},"prefetch_data":{"uniprot":{"accession":"Q9Y5S8","full_name":"NADPH oxidase 1","aliases":["Mitogenic oxidase 1","MOX-1","NADH/NADPH mitogenic oxidase subunit P65-MOX","NOH-1"],"length_aa":564,"mass_kda":64.9,"function":"NADPH oxidase that catalyzes the generation of superoxide from molecular oxygen utilizing NADPH as an electron donor NADPH oxidase that catalyzes the generation of superoxide from molecular oxygen utilizing NADPH as an electron 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TXNDC17","url":"https://www.omim.org/entry/616967"},{"mim_id":"613306","title":"AlkB HOMOLOG 8, tRNA METHYLTRANSFERASE; ALKBH8","url":"https://www.omim.org/entry/613306"},{"mim_id":"611256","title":"NADPH OXIDASE ORGANIZER 1; NOXO1","url":"https://www.omim.org/entry/611256"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"intestine","ntpm":67.4}],"url":"https://www.proteinatlas.org/search/NOX1"},"hgnc":{"alias_symbol":["NOH1","NOH-1","MOX1","GP91-2","NOH-1L"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y5S8","domains":[{"cath_id":"-","chopping":"26-287","consensus_level":"high","plddt":90.6199,"start":26,"end":287},{"cath_id":"2.40.30.10","chopping":"294-386","consensus_level":"high","plddt":91.7832,"start":294,"end":386},{"cath_id":"-","chopping":"395-407_415-443_468-476_522-533_544-564","consensus_level":"medium","plddt":89.3214,"start":395,"end":564}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5S8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5S8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5S8-F1-predicted_aligned_error_v6.png","plddt_mean":90.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NOX1","jax_strain_url":"https://www.jax.org/strain/search?query=NOX1"},"sequence":{"accession":"Q9Y5S8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y5S8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y5S8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5S8"}},"corpus_meta":[{"pmid":"10485709","id":"PMC_10485709","title":"Cell 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Effects on Nox1 NADPH oxidase signaling.","date":"2015","source":"Frontiers in chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25870854","citation_count":22,"is_preprint":false},{"pmid":"31518594","id":"PMC_31518594","title":"Nox1 downregulators: A new class of therapeutics.","date":"2019","source":"Steroids","url":"https://pubmed.ncbi.nlm.nih.gov/31518594","citation_count":22,"is_preprint":false},{"pmid":"30690057","id":"PMC_30690057","title":"ROS-generating oxidase NOX1 promotes the self-renewal activity of CD133+ thyroid cancer cells through activation of the Akt signaling.","date":"2019","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/30690057","citation_count":22,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54473,"output_tokens":11088,"usd":0.16487},"stage2":{"model":"claude-opus-4-6","input_tokens":15149,"output_tokens":4795,"usd":0.29343},"total_usd":0.4583,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"NOX1 (originally Mox1) encodes a homologue of the catalytic subunit gp91phox of the phagocyte NADPH oxidase and generates superoxide in non-phagocytic cells; overexpression in NIH3T3 cells increases superoxide production, cell growth rate, anchorage-independent growth, and tumor formation in athymic mice, while antisense NOX1 decreases superoxide generation and serum-stimulated growth in smooth muscle cells.\",\n      \"method\": \"Overexpression and antisense inhibition in NIH3T3 and vascular smooth muscle cells; superoxide measurements; tumor formation assay in athymic mice\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays (overexpression, antisense, ROS measurement, tumorigenicity), foundational paper with >1200 citations\",\n      \"pmids\": [\"10485709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"H2O2 (derived from NOX1-generated superoxide via dismutation) acts as the key intracellular signal mediating NOX1-driven cell growth and transformation; co-expression of catalase with NOX1 reverses the transformed appearance, normalizes growth rate, prevents tumor formation, and restores >60% of NOX1-regulated genes to normal levels.\",\n      \"method\": \"Co-expression of human catalase with NOX1 in NIH3T3 cells; H2O2 and O2- measurements; gene expression profiling; tumor assays in athymic mice\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (ROS quantification, catalase rescue, gene expression, tumorigenicity) in single rigorous study\",\n      \"pmids\": [\"11331784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NOX1 mediates the early phase of angiotensin II- and PDGF-induced superoxide production in vascular smooth muscle cells and is required for activation of the redox-sensitive signaling molecules p38 MAPK and Akt by Ang II; antisense NOX1 adenovirus completely inhibited this early superoxide phase and downstream redox signaling without affecting redox-independent pathways.\",\n      \"method\": \"Antisense adenoviral knockdown of NOX1 in VSMCs; superoxide measurement; Western blot for p38 MAPK and Akt phosphorylation\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal loss-of-function with specific signaling readouts, multiple agonists tested\",\n      \"pmids\": [\"11348997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NOX1 requires cytosolic activator proteins to generate superoxide; two novel colon-enriched proteins NOXO1 (p47phox homologue, lacks autoinhibitory domain and PKC phosphorylation sites) and NOXA1 (p67phox homologue, lacks first SH3 domain, has hydrophobic stretch) were identified; co-expression of NOX1 with NOXO1 and NOXA1 leads to constitutive high-level superoxide generation, whereas replacing NOXO1 with p47phox restores stimulus-dependence.\",\n      \"method\": \"Co-expression of NOX1 with p47phox/p67phox or novel NOXO1/NOXA1 in heterologous cells; superoxide measurements; cDNA cloning\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of enzymatic activity with defined subunits and domain swap experiments\",\n      \"pmids\": [\"12473664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NOX1-derived ROS trigger the angiogenic switch by markedly upregulating VEGF mRNA (in cultured cells and tumors) and inducing VEGFR1/VEGFR2 in vascular cells; matrix metalloproteinase activity is also induced; VEGF induction is abolished by catalase co-expression, implicating H2O2 as the signaling intermediate.\",\n      \"method\": \"NOX1 overexpression in DU-145 prostate cells; VEGF mRNA measurement; immunostaining of VEGF receptors in tumors; catalase co-expression; MMP activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with catalase rescue establishing H2O2 as mediator\",\n      \"pmids\": [\"11805326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Oncogenic Ras upregulates NOX1 expression via the MEK-MAPK pathway, and NOX1-generated ROS are required for Ras-induced transformation; siRNA knockdown of NOX1 blocks anchorage-independent growth, morphological transformation, and tumor formation in athymic mice caused by activated Ras.\",\n      \"method\": \"siRNA knockdown of NOX1 in Ras-transformed cells; MEK inhibitor; anchorage-independent growth assay; tumor formation in athymic mice\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — specific siRNA loss-of-function with multiple transformation phenotype readouts and pathway inhibition\",\n      \"pmids\": [\"15150115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NOX1 activity in growth factor-stimulated cells is mediated by sequential activation of PI3K → βPix (a Rac GEF that constitutively associates with the C-terminal region of NOX1) → Rac1 (which binds to the C-terminal region of NOX1 in a growth factor-dependent manner); siRNA depletion of βPix blocks both Rac1 activation and ROS production.\",\n      \"method\": \"Co-immunoprecipitation of NOX1 C-terminal region with βPix and Rac1; siRNA knockdown of βPix and Nox1; ROS measurement; PI3K and other pathway inhibitors\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP establishing constitutive NOX1-βPix complex plus siRNA epistasis defining pathway order\",\n      \"pmids\": [\"15121857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NOX1 physically associates with p22phox in vascular smooth muscle cells; co-immunoprecipitation and confocal colocalization demonstrate the two proteins are preassembled at the plasma membrane and submembrane areas in unstimulated cells, and NADPH-driven superoxide production depends on coexpression of both subunits.\",\n      \"method\": \"Co-immunoprecipitation of HA-tagged NOX1 with p22phox; confocal colocalization; ESR spin-probe measurement of NADPH-driven superoxide in cells expressing both subunits\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus colocalization plus functional reconstitution showing subunit dependence\",\n      \"pmids\": [\"15477006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NOX1 is required for angiotensin II-induced superoxide production and the resultant pressor response in vivo; Nox1-knockout mice show significantly blunted blood pressure elevation and aortic superoxide production in response to Ang II, with preserved endothelium-dependent relaxation and cGMP levels, indicating NOX1-derived ROS reduce NO bioavailability to mediate hypertension.\",\n      \"method\": \"Nox1 knockout mice; Ang II infusion; telemetric blood pressure measurement; superoxide production in aorta; endothelium-dependent relaxation; cGMP measurement; L-NAME experiments\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout model with multiple vascular phenotype readouts, replicated in pharmacological experiments\",\n      \"pmids\": [\"16246966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TNF treatment induces formation of a signaling complex containing TRADD, RIP1, NOX1, and the small GTPase Rac1 in mouse fibroblasts undergoing necrosis; RIP1 is essential for NOX1 recruitment to this complex; dominant-negative TRADD or Rac1 and NOX1 siRNA each prevent TNF-induced superoxide generation and necrotic cell death.\",\n      \"method\": \"Co-immunoprecipitation demonstrating TRADD/RIP1/NOX1/Rac1 complex; RIP1-deficient fibroblasts; dominant-negative mutants; NOX1 siRNA; superoxide measurement; cell death assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complex identified by co-IP, validated by genetic deficiency and dominant-negative mutants with specific phenotypic readout\",\n      \"pmids\": [\"17560373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The C-terminal cytosolic tail of NOX1 confers cytosolic subunit-dependent activation, while the N-terminal transmembrane portion determines plasma membrane localization and superoxide (vs. H2O2) release; Nox1 N-terminus is proteolytically cleaved; chimeric NOX1/NOX4 proteins reveal that a Nox4 cytosolic tail fused to Nox1 transmembrane domain renders NOX1 constitutively active.\",\n      \"method\": \"Chimeric NOX1/NOX4 constructs expressed in HEK293 cells; TIRF microscopy for subcellular localization; Myc-tag processing analysis; ROS measurements\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — domain-swap mutagenesis with structure-function validation and live-cell imaging\",\n      \"pmids\": [\"19061439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Tks4 and Tks5 (c-Src substrate proteins) are functional p47phox-related organizers that selectively support NOX1 (and NOX3) activity; Tks proteins interact with the NOXA1 activator through an SH3 domain-mediated interaction; endogenous Tks4 is required for Rac GTPase- and NOX1-dependent ROS production and for NOX1 recruitment to invadopodia in DLD1 colon cancer cells.\",\n      \"method\": \"Reconstituted cellular systems; co-immunoprecipitation (Tks-NoxA1 SH3 interaction); siRNA knockdown of Tks4; ROS measurement; invadopodia formation assay\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — protein interaction defined by SH3-domain mechanism, validated by endogenous knockdown with specific cellular phenotype\",\n      \"pmids\": [\"19755710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"LRRC8A (a component of volume-regulated anion channels) co-localizes with and co-immunoprecipitates with NOX1 and its p22phox subunit in vascular smooth muscle cells; LRRC8A siRNA suppresses TNFα-induced extracellular superoxide production by NOX1, TNFR1 endocytosis, and JNK phosphorylation; extracellular superoxide (not H2O2) is the critical oxidant enabling TNFR1 endocytosis.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; VRAC inhibitor; extracellular SOD/catalase discrimination; TNFR1 endocytosis assay; JNK phosphorylation\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP establishing complex membership plus siRNA loss-of-function with specific signaling readouts\",\n      \"pmids\": [\"27838438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TNFα-induced NOX1 activation in smooth muscle cells requires dynamin-dependent receptor endocytosis, whereas thrombin-mediated NOX1 activation occurs outside endosomes and requires EGFR transactivation; both pathways converge on PI3K-Akt-ATF-1 signaling in a NOX1- and dynamin-dependent manner.\",\n      \"method\": \"NOX1 shRNA; dominant-negative dynamin; endosomal ROS measurement; EGFR transactivation assay; PI3K-Akt-ATF-1 pathway analysis\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — shRNA loss-of-function combined with dominant-negative and pharmacological tools defining spatial compartmentalization of NOX1 activation\",\n      \"pmids\": [\"19737091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NOX1 upregulates EGFR and TGF-α expression through an Src-ERK positive feedback loop and a parallel p38 MAPK-AKT pathway, driving autocrine growth of liver tumor cells; NOX1 knockdown reduces EGFR/TGF-α mRNA and EGFR phosphorylation, and antioxidants or NADPH oxidase inhibition attenuates autocrine growth.\",\n      \"method\": \"NOX1 siRNA; antioxidants; pharmacological NADPH oxidase inhibition; EGFR/TGF-α mRNA and protein measurement; EGFR phosphorylation; pathway inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal loss-of-function approaches with specific molecular readouts defining the pathway\",\n      \"pmids\": [\"20525691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NOX1-derived ROS promote invadopodia formation (extracellular matrix-degrading actin-rich structures) in human colon cancer cells; the selective NOX1 small-molecule inhibitor ML171 (2-acetylphenothiazine) blocks NOX1-dependent ROS generation and invadopodia formation at nanomolar concentrations with selectivity over other NOX isoforms; NOX1 overexpression rescues ML171 inhibition, confirming selectivity.\",\n      \"method\": \"High-throughput screening; ML171 pharmacological inhibition; NOX1 overexpression rescue; invadopodia assay; isoform selectivity panel\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — specific inhibitor validated by rescue overexpression, selective isoform profiling, and defined cellular phenotype\",\n      \"pmids\": [\"20715845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Annexin A1 (ANXA1) activates epithelial NOX1 through formyl peptide receptor 1 (FPR1) signaling; NOX1-derived ROS oxidatively inactivate phosphatases PTEN and PTP-PEST, leading to activation of FAK and paxillin, thereby promoting epithelial cell migration and mucosal wound repair; intestinal epithelial-specific Nox1 knockout mice show defects in mucosal wound repair.\",\n      \"method\": \"Intestinal epithelial-specific Nox1 knockout mice; ANXA1 administration; phosphatase activity (PTEN, PTP-PEST); FAK and paxillin activation; cell migration assay; in vivo wound repair\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific knockout with defined molecular mechanism (phosphatase oxidation → FAK/paxillin) and in vivo phenotype\",\n      \"pmids\": [\"23241962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DNA damage-induced ROS generation is mediated through the H2AX-NOX1/Rac1 pathway; H2AX overexpression or NCS-induced DNA damage increases NOX1 activity partly by reducing the interaction between the NOX1 activator NOXA1 and its inhibitor 14-3-3ζ; NOX1 knockdown (but not NOX4) reduces ROS and cell death induced by H2AX accumulation.\",\n      \"method\": \"siRNA knockdown of NOX1 and NOX4; dominant-negative Rac1; NADPH oxidase inhibitor DPI; ROS measurement; co-immunoprecipitation (NOXA1/14-3-3ζ interaction); cell death assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway defined by specific knockdowns plus co-IP identifying regulatory interaction of NOXA1/14-3-3ζ\",\n      \"pmids\": [\"22237206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In rat REF52 cells, oncogenic Ras upregulates NOX1 through the Ras/MEK pathway to increase intracellular ROS, which transduce senescence signals activating the p53 and p16Ink4a pathways; NOX1 siRNA blocks Ras-induced senescence (β-galactosidase activity, growth arrest), DNA damage response, and p38MAPK activation; this is confirmed in Nox1 knockout mouse embryo fibroblasts.\",\n      \"method\": \"siRNA knockdown of NOX1; Nox1 knockout MEFs; senescence markers (β-gal, p53, p16); DNA damage assay; p38 MAPK phosphorylation; MEK inhibitor\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO corroborates siRNA data; pathway placement (Ras/MEK → NOX1 → ROS → p53/p16 → senescence) established with multiple readouts\",\n      \"pmids\": [\"23216904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Protein kinase C-β1 phosphorylates NOX1 at threonine 429 in response to TNFα; this phosphorylation facilitates association of NOX1 with the NoxA1 activation domain, is necessary for NADPH oxidase complex assembly, ROS production, and vascular smooth muscle cell migration; PKCβ1 siRNA abolishes TNFα-mediated ROS production and VSMC migration.\",\n      \"method\": \"Mass spectrometry identifying phosphorylation site; PKCβ1 inhibitor and siRNA; site-directed mutagenesis (T429A); isothermal titration calorimetry (NOX1/NoxA1 interaction); ROS measurement; VSMC migration assay\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — phosphorylation site identified by MS, validated by mutagenesis, interaction quantified by ITC, and functional consequence demonstrated\",\n      \"pmids\": [\"25228390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Peroxiredoxin 6 (Prdx6) is a novel binding partner of NOXA1, identified by yeast two-hybrid using the NOXA1 SH3 domain as bait; Prdx6 binds to and stabilizes NOXA1 via SH3 domain interaction; both the peroxidase (C47S) and phospholipase A2 (S32A) activities of Prdx6 are required for NOX1 activation and NOX1-mediated cell migration; the PLA2 transition-state inhibitor MJ-33 suppresses NOX1 activity.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; Prdx6 knockdown and overexpression; enzymatic mutants (C47S, S32A); MJ-33 inhibitor; superoxide measurement; cell migration assay\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction discovered by yeast two-hybrid, confirmed by co-IP, validated with enzymatic mutants and specific inhibitor, with functional readout\",\n      \"pmids\": [\"27094494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CRISPR/Cas9-mediated knockout of p22phox (CYBA) abolishes NOX1 (and NOX4) activity but not NOX5 activity; p22phox is required for maturation and activity of NOX1; rescue with human or rat p22phox, but not DUOXA1/A2, restores NOX1-dependent superoxide production.\",\n      \"method\": \"CRISPR/Cas9 knockout; reconstitution with human/rat p22phox and DUOXA1/A2; ROS measurements (H2O2 and superoxide); multiple p22phox mutation analysis\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CRISPR-mediated knockout with reconstitution experiments establishing p22phox as an essential NOX1 maturation factor\",\n      \"pmids\": [\"27614387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NOX1-derived ROS in the ventral tegmental area (VTA) mediate depressive-like behaviors by oxidizing NMDA receptor subunit NR1 (at C744); NOX1-derived ROS suppress NMDA-induced BDNF upregulation in cortical neurons via NR1 oxidation; NR1 C744A mutant is resistant to H2O2-mediated suppression of BDNF; redox proteomics identified NR1 as the NOX1 target.\",\n      \"method\": \"Nox1 knockout mice; miRNA delivery to VTA; chronic social defeat stress and corticosterone models; redox proteome analysis; cortical neuron culture with H2O2 and NR1 C744A mutant; BDNF mRNA and DNA methylation measurements\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO, region-specific miRNA knockdown, redox proteomics, and mutagenesis (NR1 C744A) together define molecular target of NOX1-derived ROS\",\n      \"pmids\": [\"28314819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NOX1 is required for normal apoptosis of pulmonary arterial smooth muscle cells (PASMCs) through regulation of the voltage-gated K+ channel Kv1.5 and intracellular potassium levels; Nox1-deficient mice develop spontaneous pulmonary vascular remodeling with reduced PASMC apoptosis and decreased Kv1.5 protein; re-expression of rat NOX1 transgene in knockout mice rescues impaired apoptosis and Kv1.5 levels.\",\n      \"method\": \"Nox1 knockout mice; Nox1 transgene rescue; flow cytometry and TUNEL for apoptosis; Kv1.5 protein measurement; intracellular potassium measurement\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with transgene rescue establishing NOX1 → Kv1.5 → K+ → apoptosis pathway\",\n      \"pmids\": [\"24233492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NOX1 mediates morphine-induced analgesic tolerance by attenuating opioid pharmacology; Nox1-deficient mice show augmented morphine analgesia and suppressed tolerance; NOX1-derived ROS regulate GTPase activity in the dorsal spinal cord, impair G-protein coupling, promote PKC isoform membrane translocation, enhance RGS9-2 phosphorylation, and facilitate Gαi2/RGS9-2/14-3-3 complex formation.\",\n      \"method\": \"Nox1 knockout mice; [35S]GTPγS binding; morphine-stimulated GTPase activity; PKC membrane translocation assay; RGS9-2 phosphorylation; co-immunoprecipitation (Gαi2/RGS9-2/14-3-3)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple biochemical readouts defining a specific molecular mechanism for NOX1 in opioid tolerance\",\n      \"pmids\": [\"22159121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"STAT1 and STAT3 directly bind to GAS elements in the NOX1 promoter (demonstrated by chromatin immunoprecipitation) and transactivate NOX1 expression in human vascular smooth muscle cells; JAK/STAT pathway regulates IFNγ-induced NOX1 activity; JAK/STAT blockade reduces NOX1 subunit transcription.\",\n      \"method\": \"Chromatin immunoprecipitation; promoter-luciferase assays; STAT1/STAT3 overexpression; JAK/STAT inhibitors; NOX activity measurement\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP establishing physical STAT-NOX1 promoter interaction plus functional validation with overexpression and inhibitors\",\n      \"pmids\": [\"19834108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MEF2B transcription factor binds to a consensus MEF2 site in the NOX1 promoter (-146 to -125) in response to prostaglandin F2α; MEF2B is downstream of ATF-1 in a PGF2α/PDGF-induced cascade (ATF-1→MEF2B→NOX1); MEF2B siRNA suppresses NOX1 expression and reduces VSMC superoxide production.\",\n      \"method\": \"Promoter deletion analysis; MEF2 site binding; MEF2B siRNA; ATF-1 siRNA; RT-PCR of NOX1; superoxide assay in VSMCs\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — promoter mapping with siRNA epistasis defining transcriptional pathway for NOX1 regulation\",\n      \"pmids\": [\"17822438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Nox1, together with its partner proteins NOXO1 and NOXA1, is localized predominantly to the Golgi apparatus in human gastric adenocarcinoma cells (intestinal-type, diffuse-type, and signet-ring cell carcinoma), with nuclear localization also observed in diffuse-type; co-expression of Nox1, NOXO1, NOXA1, and p22phox is specific to gastric cancer cells and absent from normal gastric mucosa.\",\n      \"method\": \"Immunohistochemistry; confocal microscopy showing subcellular localization; immunofluorescence\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization experiment in disease tissue without functional perturbation of the complex\",\n      \"pmids\": [\"18037128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NOX1 overexpression induces genome instability; co-expression of NOX1 with NOXO1 and NOXA1 in HeLa cells increases 8-oxoguanine levels and causes a 3-fold increase in HPRT mutation rate, without upregulating DNA repair enzymes, suggesting ROS-mediated saturation of repair capacity.\",\n      \"method\": \"Co-expression of hNOX1/NOXO1/NOXA1 in HeLa cells; ROS measurement; 8-oxoguanine quantification; HPRT mutation rate; repair enzyme expression analysis\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reconstituted enzymatic complex with specific genotoxic readout; single lab study\",\n      \"pmids\": [\"17963706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NOX1 inhibits p53 proapoptotic transcriptional activity and p53 Lys382 acetylation through a SIRT1-dependent mechanism; NOX1 activates SIRT1 deacetylase activity, and SIRT1 deacetylase-defective mutant (SIRT1HY) renders cells unresponsive to NOX1-dependent inhibition of p53; recovery of HIPK2 function downregulates NOX1 and rescues p53 Lys382 acetylation.\",\n      \"method\": \"siRNA knockdown of NOX1 and SIRT1; SIRT1 inhibitor nicotinamide; SIRT1HY deacetylase-dead mutant; p53 Lys382 acetylation and transcriptional activity assays; HIPK2 rescue experiment\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple complementary genetic and pharmacological approaches; single lab\",\n      \"pmids\": [\"20171273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NOX1 is the key NADPH oxidase regulating GPVI-dependent ROS production in platelets; pharmacological inhibition of NOX1 with ML171 blocks GPVI (collagen-related peptide)-induced ROS, thromboxane A2 production (via p38 MAPK signaling), and reduces collagen-mediated thrombus formation at arterial shear in ex vivo perfusion; Nox2-deficient mice confirm NOX1 specificity for this pathway.\",\n      \"method\": \"ML171 pharmacological inhibition; Nox2-deficient mice; p38 MAPK inhibition; TxA2 measurement; platelet aggregation assay; ex vivo perfusion thrombus model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological + genetic (Nox2 KO) dissection of isoform-specific platelet signaling; single lab\",\n      \"pmids\": [\"24494191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NOX1 directly interacts with and stabilizes ADAM17 (TACE) from ubiquitin-mediated degradation; NOX1 overexpression activates the ADAM17-EGFR-PI3K-AKT signaling pathway to promote colon cancer cell migration and invasion; co-immunoprecipitation demonstrates the NOX1-ADAM17 physical interaction.\",\n      \"method\": \"Co-immunoprecipitation; NOX1 overexpression; ADAM17 ubiquitination assay; EGFR-PI3K-AKT pathway Western blot; migration/invasion assay\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP with functional overexpression studies; single lab\",\n      \"pmids\": [\"27874952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NOX1-derived ROS mediate colonic stem cell (CSC) proliferation through redox-dependent activation of EGFR signaling; NOX1 expression is CSC-specific and restricted to proliferating CSCs; in the absence of NOX1, CSCs fail to generate ROS and have reduced proliferation; NOX1 expression is regulated by Toll-like receptor activation in response to the microbiota, establishing a TLR-NOX1-EGFR axis.\",\n      \"method\": \"NOX1 knockout colonoids and mice; single-cell ROS measurement; EGFR signaling readout; TLR stimulation; CSC-specific NOX1 expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — NOX1 knockout with multiple orthogonal readouts defining TLR→NOX1→EGFR signaling axis in stem cells\",\n      \"pmids\": [\"33826887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Renal NOXA1-dependent NOX1 activity is required for Ang II-induced upregulation of epithelial sodium channel (ENaC) in collecting duct principal cells and sodium retention; Noxa1 knockout mice show attenuated Ang II-induced hypertension and impaired ENaC activation; aldosterone induces ROS and Noxa1/Scnn1a expression and ENaC activity through NOXA1-NOX1, abolished by Noxa1 siRNA.\",\n      \"method\": \"Noxa1 knockout mice; telemetric blood pressure; ENaC activity measurement; Na+ excretion assay; Noxa1 siRNA in renal epithelial cells; ROS measurement\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and siRNA defining NOXA1/NOX1-ENaC-sodium retention pathway with in vivo and in vitro validation\",\n      \"pmids\": [\"34714114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NOX1-derived ROS drive spermatogonial stem cell (SSC) self-renewal under normoxia through a ROS-BCL6B-NOX1 feed-forward pathway; under hypoxia, NOX1-derived (not mitochondrial) ROS influence HIF1A expression in undifferentiated spermatogonia; Nox1-deficient SSCs proliferate poorly under hypoxia but normally under normoxia; CDKN1A depletion rescues impaired Nox1-deficient SSC proliferation under hypoxia.\",\n      \"method\": \"Nox1 knockout mice and SSC cultures; normoxia/hypoxia conditions; BCL6B expression; HIF1A measurement; CDKN1A siRNA rescue; mitochondrial ROS suppression\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple rescue experiments defining NOX1 pathway in stem cell self-renewal under defined oxygen conditions\",\n      \"pmids\": [\"33446567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NF-κB directly regulates NOXO1 expression in TNF-α-stimulated gastric cancer cells, activating the NOX1 complex; NOX1/ROS signaling increases proliferation of gastric epithelial cells and expands SOX2-positive undifferentiated epithelial stem cells; disruption of Noxo1 in gastritis mouse model suppresses metaplastic hyperplasia and reduces SOX2-positive cells.\",\n      \"method\": \"NF-κB inhibition and overexpression; NOXO1 promoter analysis; Noxo1 knockout in K19-C2mE mice; in situ hybridization; SOX2 immunostaining; gastric hyperplasia histology\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic disruption in mouse model plus promoter mechanism establishing NF-κB→NOXO1→NOX1 pathway in gastric tumorigenesis\",\n      \"pmids\": [\"30700829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Helicobacter pylori LPS activates NOX1 in gastric mucosal cells through two distinct events: transcriptional upregulation of Nox1 and NOXO1 mRNAs, and activation of Rac1 (GTP-bound state) via PI3K; a constitutively active Rac1 adenovirus (but not Cdc42) restores PI3K inhibitor-blocked superoxide generation, establishing Rac1 as an essential NOX1 activator.\",\n      \"method\": \"Primary guinea pig gastric mucosal cells; Rac1 GTP-loading assay; adenoviral constitutively active Rac1/Cdc42; PI3K inhibitor LY294002; actinomycin D and cycloheximide blocking; superoxide measurement\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established by constitutively active Rac1 rescue plus pathway inhibitors; multiple complementary approaches\",\n      \"pmids\": [\"15469954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NOX1 missense variants p.Pro330Ser and p.Asp360Asn found in VEOIBD patients show reduced ROS production compared to wild-type NOX1 despite appropriate cellular localization; cells harboring these variants have defective host resistance to Campylobacter jejuni infection, establishing that NOX1 ROS generation is required for epithelial innate defense.\",\n      \"method\": \"Sanger sequencing; ROS generation assay in model cell lines and murine crypts; cellular localization assessment; pathogen infection assay (C. jejuni, EPEC); structural homology modeling\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — patient-derived loss-of-function variants functionally characterized with ROS and infection assays establishing structure-function relationship\",\n      \"pmids\": [\"26301257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The NOX1 promoter region contains a GATA-4/5/6 binding element and overlapping sites for Cdx1/Cdx2 and HNF-1α; these factors show cooperativity in transactivating the NOX1 promoter; GATA-6, HNF-1α, and Cdx2 bind to this chromatin region in CaCo2 cells; their expression gradients in mouse colon parallel the distal-to-proximal NOX1 gradient.\",\n      \"method\": \"Promoter-luciferase deletion analysis; in vitro DNA binding; chromatin immunoprecipitation in CaCo2 cells; transcription factor co-transfection cooperativity assay; NOX1 expression gradient analysis in normal and germ-free mice\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP establishing physical occupancy of identified TFs at NOX1 promoter in intact chromatin, corroborated by cooperativity and in vivo expression data\",\n      \"pmids\": [\"18005670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NOX1 is expressed in hepatic stellate cells (HSCs) but not Kupffer cells; NOX1 mediates profibrogenic effects in endogenous liver cells; NOX1-deficient HSCs show decreased ROS generation and fail to upregulate collagen α1(I) and TGF-β in response to angiotensin II; bone marrow chimera experiments confirm that NOX1 acts in endogenous liver cells rather than bone marrow-derived cells.\",\n      \"method\": \"Nox1 knockout mice; CCl4 and bile duct ligation hepatic fibrosis models; bone marrow chimeras; HSC and Kupffer cell isolation; ROS generation; collagen/TGF-β measurement\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO combined with bone marrow chimeras providing cellular resolution of NOX1 function in hepatic fibrosis\",\n      \"pmids\": [\"21384410\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NOX1 is a superoxide-generating NADPH oxidase that forms a multi-protein complex with the membrane subunit p22phox, cytosolic organizers NOXO1 (or Tks4/Tks5) and activator NOXA1, and the small GTPase Rac1; its enzymatic activity is stimulated by upstream signals (growth factors, Ang II, TNFα, TLRs) acting through PI3K→βPix→Rac1, and is regulated post-translationally by PKCβ1-mediated phosphorylation of Thr429 (which controls NoxA1 docking) and by NOXA1 stabilization via Prdx6; the resulting extracellular superoxide and intracellular H2O2 function as second messengers that inactivate phosphatases (PTEN, PTP-PEST), activate EGFR/MAPK/AKT/NF-κB pathways, oxidize NMDA receptor NR1, regulate Kv1.5 channel abundance, and control ENaC-mediated Na+ reabsorption, collectively mediating cell proliferation, migration, wound repair, vascular tone, stem cell self-renewal, and necrotic cell death downstream of TNFα-RIP1 signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NOX1 is a superoxide-generating NADPH oxidase that functions as a catalytic core of a multi-subunit complex to produce reactive oxygen species (ROS) serving as second messengers in cell proliferation, migration, vascular tone regulation, innate epithelial defense, and stem cell self-renewal. The active complex requires the membrane partner p22phox for maturation and activity, cytosolic organizers NOXO1 (or Tks4/Tks5), the activator NOXA1, and the small GTPase Rac1, which is recruited via PI3K→βPix signaling; PKCβ1 phosphorylation of NOX1 at Thr429 controls NOXA1 docking and complex assembly [PMID:12473664, PMID:15477006, PMID:27614387, PMID:15121857, PMID:25228390]. NOX1-derived superoxide is dismutated to H₂O₂, which oxidatively inactivates phosphatases PTEN and PTP-PEST to activate FAK-dependent migration, drives EGFR/MAPK/AKT signaling cascades promoting proliferation and transformation, and oxidizes NMDA receptor NR1 at C744 to modulate neuronal BDNF expression [PMID:11331784, PMID:23241962, PMID:20525691, PMID:28314819]. In vivo, Nox1 deficiency attenuates angiotensin II-induced hypertension by preserving NO bioavailability, impairs mucosal wound repair, reduces pulmonary arterial smooth muscle cell apoptosis through loss of Kv1.5 channel regulation, and compromises colonic stem cell proliferation downstream of TLR–EGFR signaling; loss-of-function NOX1 variants are associated with very-early-onset inflammatory bowel disease and defective epithelial antimicrobial defense [PMID:16246966, PMID:23241962, PMID:24233492, PMID:33826887, PMID:26301257].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of NOX1 as a non-phagocytic gp91phox homologue established that dedicated NADPH oxidases exist outside immune cells and that their superoxide output drives mitogenic signaling and transformation.\",\n      \"evidence\": \"Overexpression/antisense in NIH3T3 and VSMCs with superoxide measurement and tumorigenicity assays\",\n      \"pmids\": [\"10485709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Accessory subunits not yet identified\", \"Endogenous physiological stimuli undefined\", \"In vivo relevance unconfirmed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that H₂O₂ (from superoxide dismutation) is the actual intracellular second messenger resolved whether superoxide or its derivative mediates NOX1 downstream signaling, and separately established that NOX1 mediates Ang II- and PDGF-induced redox signaling to p38 MAPK and Akt in vascular smooth muscle cells.\",\n      \"evidence\": \"Catalase co-expression reversing transformation and gene expression; antisense adenoviral knockdown blocking Ang II-induced signaling in VSMCs\",\n      \"pmids\": [\"11331784\", \"11348997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The cytosolic activator subunits required for NOX1 enzymatic activity were still unknown\", \"Source of vascular ROS in vivo not yet demonstrated genetically\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery of the dedicated organizer NOXO1 and activator NOXA1 — distinct from phagocyte p47phox/p67phox — explained why NOX1 can be constitutively active and defined the minimal subunit complement for reconstituted activity.\",\n      \"evidence\": \"cDNA cloning plus reconstitution: co-expression of NOX1/NOXO1/NOXA1 yields constitutive superoxide; domain-swap with p47phox restores stimulus-dependence\",\n      \"pmids\": [\"12473664\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of small GTPases in the complex not yet defined\", \"p22phox requirement for NOX1 not formally demonstrated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Three converging studies established: (1) oncogenic Ras upregulates NOX1 via MEK-MAPK and NOX1 is required for Ras transformation; (2) PI3K→βPix→Rac1 constitutes the upstream activation cascade linking growth factors to NOX1; (3) p22phox physically associates with NOX1 at the plasma membrane and is required for superoxide output; and (4) bacterial LPS activates NOX1 via transcriptional upregulation plus Rac1-GTP loading.\",\n      \"evidence\": \"siRNA knockdown blocking Ras transformation; reciprocal co-IP of NOX1-βPix-Rac1 with siRNA epistasis; co-IP and confocal colocalization of NOX1-p22phox; Rac1 GTP-loading and CA-Rac1 rescue in gastric cells\",\n      \"pmids\": [\"15150115\", \"15121857\", \"15477006\", \"15469954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Post-translational regulation of NOX1 itself not identified\", \"In vivo vascular phenotype of Nox1 loss not yet tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Genetic loss-of-function in vivo demonstrated that NOX1 is required for angiotensin II-induced superoxide production and hypertension, establishing NOX1 as a mediator of vascular tone through reduction of NO bioavailability.\",\n      \"evidence\": \"Nox1 knockout mice with telemetric blood pressure, aortic superoxide measurement, endothelium-dependent relaxation, and cGMP assays\",\n      \"pmids\": [\"16246966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Renal contribution of NOX1 to blood pressure not separated from vascular contribution\", \"Downstream ion channel targets unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Multiple 2007 studies expanded the mechanistic picture: NOX1 was placed in a TNFα-induced necrosis complex with TRADD/RIP1/Rac1; transcriptional regulation was mapped to STAT1/3 (GAS elements), MEF2B (ATF-1 cascade), and GATA/Cdx/HNF-1α cooperativity at the promoter; NOX1 overexpression was shown to cause genome instability.\",\n      \"evidence\": \"Co-IP of TRADD/RIP1/NOX1/Rac1 complex validated by RIP1 deficiency; ChIP of STAT1/3 at NOX1 promoter; promoter deletion/ChIP for GATA-6/Cdx2/HNF-1α; mutagenesis rate assay\",\n      \"pmids\": [\"17560373\", \"19834108\", \"17822438\", \"18005670\", \"17963706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Post-translational activation mechanism of NOX1 by TNFα not defined\", \"NOX1 role in epithelial innate defense not yet examined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Domain-swap chimeras between NOX1 and NOX4 revealed that the N-terminal transmembrane region dictates plasma membrane targeting and superoxide (vs. H₂O₂) release, while the C-terminal cytosolic tail confers subunit-dependent activation; separately, Tks4/Tks5 were identified as alternative NOX1 organizers that recruit NOX1 to invadopodia.\",\n      \"evidence\": \"NOX1/NOX4 chimeric constructs with TIRF microscopy and ROS measurement; Tks4 siRNA blocking invadopodia-localized ROS in DLD1 cells\",\n      \"pmids\": [\"19061439\", \"19755710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for subunit selectivity unresolved\", \"Whether Tks and NOXO1 compete or cooperate in vivo unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Studies in 2010–2011 defined compartmentalized NOX1 activation (dynamin-dependent endosomal for TNFα vs. plasma membrane EGFR-transactivation for thrombin), established EGFR/TGF-α positive feedback, identified NOX1's role in hepatic stellate cell fibrosis, and revealed that NOX1 modulates opioid signaling and analgesic tolerance in dorsal spinal cord.\",\n      \"evidence\": \"Dominant-negative dynamin and shRNA defining compartmentalized signaling; NOX1 siRNA reducing EGFR/TGF-α autocrine loop; Nox1 KO with bone marrow chimeras in fibrosis models; Nox1 KO mice with GTPase/PKC/RGS9-2 biochemistry in morphine tolerance\",\n      \"pmids\": [\"19737091\", \"20525691\", \"21384410\", \"22159121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation events on NOX1 controlling activation unknown\", \"Mechanism of NOX1-mediated SIRT1 activation only partially defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"NOX1 was linked to Ras-induced cellular senescence (via p53/p16Ink4a) and to DNA damage-induced ROS through an H2AX–NOXA1/14-3-3ζ regulatory mechanism, expanding NOX1's role beyond proliferation to include growth-arrest and DNA-damage responses.\",\n      \"evidence\": \"Nox1 KO MEFs and siRNA blocking Ras-induced senescence markers; co-IP showing H2AX-dependent release of NOXA1 from 14-3-3ζ inhibition\",\n      \"pmids\": [\"23216904\", \"22237206\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether senescence vs. transformation outcome depends on ROS threshold not established\", \"NOXA1 phosphorylation site(s) controlling 14-3-3ζ binding not mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Intestinal epithelial-specific and pulmonary studies revealed NOX1 controls mucosal wound repair by oxidizing phosphatases PTEN/PTP-PEST to activate FAK/paxillin, and separately regulates pulmonary artery smooth muscle cell apoptosis through Kv1.5 channel stabilization, with transgene rescue confirming specificity.\",\n      \"evidence\": \"Intestinal epithelial-specific Nox1 KO with in vivo wound repair and phosphatase activity assays; Nox1 KO mice with transgene rescue, Kv1.5 protein and apoptosis measurements\",\n      \"pmids\": [\"23241962\", \"24233492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NOX1-derived ROS stabilize Kv1.5 protein is mechanistically unclear\", \"Whether phosphatase oxidation is a universal NOX1 signaling mechanism across tissues untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of PKCβ1-mediated phosphorylation of NOX1 at Thr429 as required for NOXA1 docking provided the first direct post-translational regulatory mechanism on the NOX1 catalytic subunit itself.\",\n      \"evidence\": \"Mass spectrometry phosphosite identification; T429A mutagenesis; ITC measuring NOX1–NOXA1 binding affinity; PKCβ1 siRNA abolishing TNFα-induced ROS and VSMC migration\",\n      \"pmids\": [\"25228390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional phosphorylation sites exist on NOX1 not surveyed\", \"Crystal/cryo-EM structure of the NOX1 complex unavailable\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Patient-derived NOX1 missense variants (P330S, D360N) causing reduced ROS production and impaired epithelial defense against Campylobacter jejuni linked NOX1 loss-of-function to very-early-onset inflammatory bowel disease.\",\n      \"evidence\": \"Sanger sequencing of VEOIBD patients; ROS assay in model cells and murine crypts; pathogen infection assay\",\n      \"pmids\": [\"26301257\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Penetrance and genetic modifiers in VEOIBD families not established\", \"Whether NOX1 variants affect microbiome composition not examined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"CRISPR knockout of p22phox confirmed its absolute requirement for NOX1 maturation and activity, Prdx6 was identified as a NOXA1 stabilizer whose dual enzymatic activities are needed for NOX1 activation, and NOX1 was shown to stabilize ADAM17 from ubiquitin-mediated degradation to promote EGFR-PI3K-AKT signaling.\",\n      \"evidence\": \"CRISPR KO of CYBA with reconstitution; yeast two-hybrid identifying Prdx6-NOXA1 interaction validated by co-IP and enzymatic mutants; co-IP of NOX1-ADAM17 with ubiquitination assay\",\n      \"pmids\": [\"27614387\", \"27094494\", \"27874952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Prdx6 PLA2 activity mechanistically supports NOX1 activation is unclear\", \"ADAM17 interaction awaits reciprocal validation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Redox proteomics identified NMDA receptor subunit NR1 oxidation at C744 as the molecular target by which NOX1-derived ROS suppress BDNF in cortical neurons and mediate depressive-like behavior, extending NOX1 function to CNS redox signaling.\",\n      \"evidence\": \"Nox1 KO mice; VTA-targeted miRNA knockdown; redox proteome analysis; NR1 C744A mutagenesis rescuing BDNF suppression\",\n      \"pmids\": [\"28314819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NOX1 oxidizes other neuronal substrates not surveyed\", \"Cell-type-specific NOX1 expression in brain not fully mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"NOX1 was established as a critical driver of stem cell self-renewal: colonic stem cell proliferation depends on TLR-activated NOX1–EGFR signaling, and spermatogonial stem cells require NOX1-derived ROS for a BCL6B–NOX1 feed-forward loop under normoxia and HIF1A regulation under hypoxia.\",\n      \"evidence\": \"NOX1 KO colonoids and mice with single-cell ROS and EGFR readouts; Nox1 KO SSC cultures under normoxia/hypoxia with BCL6B/HIF1A/CDKN1A epistasis\",\n      \"pmids\": [\"33826887\", \"33446567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NOX1 governs stem cell fate in other tissues unknown\", \"Direct ROS targets in colonic stem cells not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Renal NOXA1-NOX1 activity was shown to be required for aldosterone/Ang II-induced ENaC activation and sodium retention, providing a molecular link between NOX1 and electrolyte homeostasis in collecting duct principal cells.\",\n      \"evidence\": \"Noxa1 KO mice with telemetric blood pressure, ENaC activity, and Na⁺ excretion; Noxa1 siRNA in renal epithelial cells\",\n      \"pmids\": [\"34714114\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NOX1 regulates other renal ion transporters not examined\", \"Direct ROS target linking NOX1 to ENaC trafficking or gating undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Despite extensive functional characterization, the atomic-resolution structure of the NOX1 holoenzyme complex has not been determined, the full repertoire of direct oxidation targets (beyond PTEN, PTP-PEST, NR1) is unknown, and the mechanisms deciding whether NOX1-derived ROS drive proliferation versus senescence versus necrosis in a given cellular context remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No cryo-EM or crystal structure of the NOX1 complex\", \"Threshold or compartmentalization rules governing divergent cell-fate outcomes not defined\", \"Relative contributions of NOXO1 vs. Tks4/Tks5 organizers in vivo not genetically dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 3, 7, 8, 10, 21]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 3, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7, 10]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 6, 14, 16, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [37, 36]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 23]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 7]}\n    ],\n    \"complexes\": [\n      \"NOX1-p22phox-NOXO1-NOXA1-Rac1 complex\",\n      \"TRADD-RIP1-NOX1-Rac1 necrosis complex\"\n    ],\n    \"partners\": [\n      \"CYBA\",\n      \"NOXO1\",\n      \"NOXA1\",\n      \"RAC1\",\n      \"ARHGEF7\",\n      \"PRDX6\",\n      \"SH3PXD2A\",\n      \"SH3PXD2B\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}