{"gene":"AOC3","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1996,"finding":"VAP-1 (AOC3) mediates lymphocyte binding to endothelial cells in a sialic acid-dependent, L-selectin-independent manner; desialylation of VAP-1 abolishes its adhesive function, and it naturally exists as a 170-kDa sialoglycoprotein on the luminal surface of vessels.","method":"Glycosidase digestion, flow-based adhesion assays, anti-VAP-1 monoclonal antibody blocking","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (biochemical, functional blocking) in a high-citation foundational paper","pmids":["8627168"],"is_preprint":false},{"year":1997,"finding":"VAP-1 mediates subtype-specific (CD8+ T cells and NK cells) rolling adhesion to peripheral lymph node HEVs under shear stress, independently of L-selectin, PSGL-1, and α4 integrins; intravital microscopy confirmed VAP-1 involvement in initial leukocyte–endothelial contacts in vivo.","method":"Flow-based adhesion assays with blocking antibodies, intravital microscopy","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal blocking with multiple antibodies plus in vivo intravital imaging, high citation count","pmids":["9254657"],"is_preprint":false},{"year":1998,"finding":"A soluble circulating form of VAP-1 (sVAP-1) exists in plasma with slightly higher apparent molecular mass than transmembrane VAP-1 under non-reducing conditions but identical mobility after reduction; sVAP-1 retains the ability to modulate lymphocyte binding to endothelial cells.","method":"Sandwich ELISA, immunoblotting, lymphocyte adhesion assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — functional adhesion assay combined with biochemical characterization in single study","pmids":["9686623"],"is_preprint":false},{"year":2000,"finding":"Recombinant VAP-1 transfected into an endothelial cell line reconstitutes shear-dependent lymphocyte adhesion; the RGD integrin-binding motif and the enzymatic (monoamine oxidase) activity are not individually indispensable for adhesion, but CD44 ligation on lymphocytes markedly upregulates VAP-1-dependent adhesion, identifying a counterreceptor activation pathway.","method":"cDNA transfection into endothelial cell line, rotatory and flow-chamber adhesion assays, site-directed mutagenesis, antibody blocking","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in cell line plus mutagenesis plus functional blocking, replicated across multiple assay formats","pmids":["10864915"],"is_preprint":false},{"year":2001,"finding":"VAP-1 functions as a molecular brake during granulocyte rolling, increasing rolling velocity and jerky skipping when blocked; anti-VAP-1 antibodies reduced granulocyte extravasation by ~70% and firm adhesion by 44% in vivo.","method":"Intravital microscopy with anti-VAP-1 monoclonal antibody blockade in rabbit inflammation model","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — in vivo intravital microscopy with quantified rolling/adhesion parameters, high citation count","pmids":["11156953"],"is_preprint":false},{"year":2004,"finding":"The oxidase (amine oxidase) enzymatic activity of VAP-1 is required for PMN transmigration through the endothelium; an enzymatically inactive point mutant abolished VAP-1-mediated transmigration, and amine oxidase inhibitors blocked PMN rolling and transmigration under laminar shear stress in vitro and PMN extravasation in vivo.","method":"Enzymatically inactive VAP-1 point mutant, specific amine oxidase inhibitors, flow-based in vitro assays, in vivo inflammation model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 — active-site mutagenesis combined with pharmacological inhibition and in vivo validation; high citation count","pmids":["14726375"],"is_preprint":false},{"year":2004,"finding":"Adipocytes (3T3-L1 and human adipose tissue explants) release a soluble form of VAP-1/SSAO by metalloprotease-dependent shedding of the membrane form; this release is stimulated by TNF-α and blocked by the metalloprotease inhibitor batimastat.","method":"Culture medium collection, VAP-1 immunoprecipitation/Western blot, metalloprotease inhibitor (batimastat), TNF-α stimulation of adipocytes","journal":"Diabetologia","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological metalloprotease inhibition identifies shedding mechanism; single lab, moderate evidence","pmids":["14968297"],"is_preprint":false},{"year":2005,"finding":"AOC3-deficient mice show impaired slow rolling, firm adhesion, and transmigration of leukocytes at inflammatory sites and lymphoid tissues; AOC3 knockout results in reduced lymphocyte homing to lymphoid organs and attenuated peritonitis, establishing the endothelial amine oxidase as a required mediator of the leukocyte extravasation cascade in vivo.","method":"Gene knockout mouse model, real-time intravital imaging, peritonitis model, lymphocyte homing assay","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple in vivo phenotypic readouts and real-time imaging; high citation count","pmids":["15664163"],"is_preprint":false},{"year":2006,"finding":"The oxidase activity of VAP-1 induces transcription and translation of endothelial E- and P-selectins; using WT vs. enzymatically inactive VAP-1 point mutant transfectants and VAP-1-deficient mice carrying human VAP-1 transgene, P-selectin induction was shown to be enzyme-activity-dependent in vivo, leading to enhanced lymphocyte binding.","method":"Endothelial cell transfection with WT and enzymatically inactive VAP-1 mutant, VAP-1-deficient + humanized transgenic mice, gene/protein expression assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis in cell lines corroborated by transgenic rescue in vivo; multiple orthogonal methods","pmids":["17548577"],"is_preprint":false},{"year":2006,"finding":"VAP-1 is expressed in smooth muscle cells as early as embryonic week 7 and is enzymatically active in fetal vessels; fetal VAP-1 is dimerized and functionally mediates cord blood lymphocyte rolling and firm adhesion under shear stress.","method":"Immunohistochemistry of human fetal tissues, enzymatic activity assay, adenoviral transfection of HUVEC, flow-based adhesion assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assay plus enzymatic characterization; single lab","pmids":["16556889"],"is_preprint":false},{"year":2007,"finding":"AOC3/VAP-1-deficient mice show age-dependent paucity of lymphocytes in Peyer's patches, lower serum IgA, defective oral immunization responses, and impaired antimicrobial immune responses against S. aureus and coxsackie B4 virus, demonstrating VAP-1 is required for normal mucosal immunity.","method":"AOC3 knockout mouse model, immunization, microbial challenge, flow cytometry, immunoglobulin quantification","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple defined immune phenotypes across multiple challenge models","pmids":["17947691"],"is_preprint":false},{"year":2008,"finding":"VAP-1 enzymatic activity mediates intestinal damage and acute lung injury after ischemia-reperfusion; VAP-1-deficient mice show attenuated injury, and separate inhibition with small molecule enzyme inhibitors or function-blocking antibody in WT mice confirms that the catalytic activity drives the pro-inflammatory response.","method":"VAP-1 KO mice, humanized VAP-1 transgenic mice, small molecule enzyme inhibitors, function-blocking antibody, ischemia-reperfusion injury model","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus pharmacological inhibition plus transgenic rescue; multiple orthogonal approaches","pmids":["18991279"],"is_preprint":false},{"year":2008,"finding":"Membrane-bound SSAO/VAP-1 catalytic activity induces vascular cell death via p53 phosphorylation and PUMA-α induction, leading to mitochondrial Bcl-2 family protein alterations and effector caspase activation, upon methylamine substrate oxidation.","method":"Stable transfection of smooth muscle cell line with hSSAO/VAP-1, substrate (methylamine) treatment, Western blot for p53/PUMA/Bcl-2, caspase activity assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway dissection in transfected cell model with multiple readouts; single lab","pmids":["18348872"],"is_preprint":false},{"year":2011,"finding":"Crystal structures of soluble AOC3 (sAOC3) reveal two imidazole binding sites: one where imidazole hydrogen-bonds to the TPQ cofactor in the inactive on-copper conformation, and another covalently bound to the active off-copper TPQ conformation; single-residue mutagenesis (Met211, Leu469) identifies these as key determinants of substrate specificity.","method":"X-ray crystallography (2.6 Å and 2.95 Å structures), site-directed mutagenesis of active-site residues, enzyme activity assays with multiple substrates, computational docking","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structures combined with mutagenesis and enzymatic activity assays, multiple substrates tested","pmids":["21585208"],"is_preprint":false},{"year":2011,"finding":"VAP-1-mediated IL-1β-induced M2 macrophage infiltration underlies lymph- and angiogenesis; VAP-1 is expressed in blood but not lymphatic endothelium in vivo, and VAP-1 inhibition blocks IL-1β-induced but not VEGF-A-induced angiogenesis and lymphangiogenesis.","method":"Corneal micropocket assay, in vivo molecular imaging, VAP-1 inhibitor, immunohistochemistry","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo functional assay with pharmacological inhibition, single lab","pmids":["21435467"],"is_preprint":false},{"year":2011,"finding":"Engineered endothelial cells stably expressing human SSAO/VAP-1 show the protein is localized to lipid rafts of the plasma membrane as a dimer and mediates leukocyte adhesion to the endothelium; SSAO/VAP-1 in smooth muscle cells (expressing 3-fold higher protein) does not mediate leukocyte adhesion, indicating cell-type-specific function.","method":"Stable transfection, lipid raft fractionation, immunofluorescence, leukocyte adhesion assay","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — subcellular localization with functional consequence demonstrated; single lab, two cell types compared","pmids":["21819380"],"is_preprint":false},{"year":2011,"finding":"VAP-1 reaction with primary amines is mechanistically characterized: a KIE of ~6–7.6 on kcat/Km with d2-benzylamine indicates an isotopically sensitive step in substrate binding/oxidation; large KIE on kcat with phenylethylamine (8.01) shows C-H bond breakage is rate-limiting for TPQ reduction; two macroscopic pKa values govern kcat as a function of pH.","method":"In vitro steady-state kinetics with soluble recombinant VAP-1, kinetic isotope effects (KIE), pH-dependence analysis, QSAR with para-substituted substrates","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous in vitro mechanistic enzyme kinetics with isotope effects and pH analysis","pmids":["21737458"],"is_preprint":false},{"year":2012,"finding":"Purified human AOC3 contains a TPQ cofactor (~6% titer) and oxidizes a broad range of primary amines (kcat/Km 10²–10⁴ M⁻¹s⁻¹); Km(O2) approximates interstitial oxygen partial pressure; dopamine and cysteamine are among the substrates with relatively high efficiency, implicating roles in insulin signaling and fatty acid metabolism; AOC3 is uniformly distributed on the adipocyte cell surface as confirmed by whole-cell kinetics matching purified enzyme.","method":"Recombinant enzyme expression in insect cells, in vitro enzyme kinetics, substrate profiling, cell-surface distribution imaging of 3T3-L1 adipocytes","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — purified recombinant enzyme with systematic substrate profiling, corroborated by whole-cell kinetics","pmids":["22238597"],"is_preprint":false},{"year":2013,"finding":"AOC3/VAP-1 oxidase activity-null knock-in mice (expressing catalytically inactive VAP-1 protein) phenocopy AOC3 KO mice in sterile peritonitis and antibody-induced arthritis models, demonstrating that the oxidase catalytic activity is responsible for the inflammatory function of VAP-1 in vivo.","method":"Oxidase-null knock-in mouse generation, peritonitis model, antibody-induced arthritis model, comparison to KO mice","journal":"American journal of clinical and experimental immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic knock-in mutagenesis in vivo, two independent inflammatory models","pmids":["23885334"],"is_preprint":false},{"year":2013,"finding":"Crystal structures of VAP-1 complexed with novel pyridazinone inhibitors reveal a unique reversible binding site in the active site channel; species-specific binding is explained by specific amino acid differences between human and rodent VAP-1 identified by structural comparison.","method":"X-ray crystallography of inhibitor–VAP-1 complexes, homology modeling, enzyme inhibition assays","journal":"Journal of medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple crystal structures with functional inhibition data and mutagenic rationale","pmids":["24304424"],"is_preprint":false},{"year":2013,"finding":"VAP-1 inhibition with a small molecule reduces myeloid cell recruitment to pulmonary metastatic sites and decreases tumor cell survival; simultaneous inhibition of VCAM-1 and VAP-1 does not produce additive effects, suggesting closely related downstream mechanisms.","method":"VAP-1 small molecule inhibitor, VCAM-1 blocking antibody, murine pulmonary metastasis model, myeloid cell quantification","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo functional model with pharmacological inhibition; epistasis-like inference from combinatorial blockade","pmids":["23407548"],"is_preprint":false},{"year":2014,"finding":"AOC3/VAP-1 expression in endothelial cells enhances susceptibility to oxygen-glucose deprivation (OGD); its enzymatic activity amplifies vascular cell damage through substrate oxidation (methylamine); OGD induces metalloprotease-2-dependent shedding of soluble SSAO/VAP-1; OGD induces SSAO/VAP-1-dependent leukocyte adhesion partly through enzymatic activity.","method":"Endothelial cells stably expressing hSSAO/VAP-1 subjected to OGD, metalloprotease inhibitors, Western blot for caspase-3/8, leukocyte adhesion assay","journal":"Cerebrovascular diseases","confidence":"Medium","confidence_rationale":"Tier 2 — multiple mechanistic readouts in a cell model with specific inhibitors; single lab","pmids":["24503888"],"is_preprint":false},{"year":2014,"finding":"AOC3/VAP-1 contributes transiently to antigen-specific CD4+ T-cell traffic to bronchial draining lymph nodes (89% reduction at day 3) in an OVA tracheal allergen model, but this difference was absent at day 6; dispersal of effector cells to lung and tracheal mucosa is AOC3-independent.","method":"AOC3 KO mice, OVA-specific CD4+ T-cell tracking kinetic model, flow cytometry","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with quantitative kinetic tracking of antigen-specific cells; single lab","pmids":["25116373"],"is_preprint":false},{"year":2007,"finding":"AOC3 (VAP-1) in adipocytes is the enzyme encoded by the AOC3 gene responsible for SSAO-dependent insulin-like stimulation of glucose transport; adipocytes from AOC3 KO mice fail to respond to benzylamine, methylamine, and tyramine with increased glucose uptake while insulin responsiveness is preserved, proving the effect is oxidation-dependent rather than receptor-mediated.","method":"AOC3 knockout mouse adipocytes, hexose transport assay, SSAO activity measurement","journal":"Journal of neural transmission","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with specific functional readout; clean loss-of-function establishes causal mechanism","pmids":["17406965"],"is_preprint":false},{"year":2010,"finding":"Histamine oxidation in mouse adipose tissue is predominantly controlled by AOC3-encoded SSAO; in AOC3 KO mice, benzylamine and histamine oxidation are abolished in adipose tissue but histamine oxidation persists in the intestine (controlled by AOC1/diamine oxidase); when protected from SSAO-mediated oxidation, histamine moderately stimulates lipolysis in adipocytes.","method":"AOC3 KO mice, enzyme activity assays in tissue homogenates, qRT-PCR, lipolysis (glycerol release) in isolated adipocytes","journal":"Inflammation research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with tissue-specific enzyme activity and functional lipolysis assay; single lab","pmids":["20012150"],"is_preprint":false},{"year":2019,"finding":"SSAO/VAP-1 expression in endothelial cells promotes BBB dysfunction associated with Alzheimer's disease by altering release of pro-inflammatory angioneurins (IL-6, IL-8, VEGF), decreasing tight-junction proteins (ZO-1, claudin-5), and increasing vascular Aβ deposition through both activity-dependent and -independent mechanisms.","method":"In vitro BBB model with SSAO/VAP-1-expressing endothelial cells, cytokine ELISA, Western blot for tight-junction proteins, permeability assay, leukocyte adhesion assay, Aβ deposition assay","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple mechanistic readouts in transfected cell model; single lab","pmids":["31047972"],"is_preprint":false},{"year":2020,"finding":"Both AOC3 KO and AOC3 oxidase-null knock-in mice are heavier and fatter than controls with loss of benzylamine insulin-like action in adipocytes but preserved insulin lipogenic responsiveness; downregulated inflammatory markers in adipose tissue; the metabolic phenotype is reproduced by oxidase-null knock-in alone, demonstrating that the enzymatic activity is responsible for these metabolic functions.","method":"AOC3 KO and AOC3 knock-in (oxidase-null) mice compared, body composition analysis, adipocyte glucose transport assay, inflammatory marker expression","journal":"Journal of physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 2 — parallel genetic models (KO vs. catalytic knock-in) with multiple metabolic phenotypes; mechanistic conclusion replicated across two complementary models","pmids":["32712883"],"is_preprint":false},{"year":2021,"finding":"AOC3 expression in smooth muscle cells is transcriptionally regulated by myocardin-related transcription factors (MRTFs: MYOCD, MRTF-A/MKL1, MRTF-B/MKL2) acting through serum response factor (SRF); the AOC3 gene locus contains SRF binding sites; SRF silencing reduces AOC3 transcripts; MRTF-A/MKL1 increases AOC3 promoter reporter activity via KDM3A chromatin remodeling.","method":"MRTF overexpression in human SMCs, SRF siRNA knockdown, promoter reporter assay, ChIP/SRF binding site analysis, KDM3A co-regulation","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — promoter reporter combined with gene knockdown and overexpression; single lab, bioinformatics corroborated by functional experiments","pmids":["33727640"],"is_preprint":false},{"year":2016,"finding":"AOC3 is expressed on the surface of pericryptal myofibroblasts (identified as the target of mAb PR2D3) and its expression is sensitive to trypsin/collagenase digestion; TGFβ substantially downregulates AOC3 in myofibroblasts but not in skin fibroblasts; knockdown of NKX2-3 (co-expressed with AOC3 in myofibroblasts) decreases myofibroblast gene expression including AOC3 and increases fibroblast marker SHOX2.","method":"mAb target identification, immunofluorescence, FACS sorting, TGFβ treatment, whole-genome microarray, NKX2-3 knockdown","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 — antibody target identification plus functional NKX2-3 KD placing AOC3 downstream of NKX2-3 in myofibroblast maintenance","pmids":["27036009"],"is_preprint":false},{"year":2024,"finding":"AOC3 loss in GIST cells stabilizes HK2 by attenuating ubiquitin-mediated degradation, leading to enhanced glycolysis and lactate production; elevated H3K18 lactylation at the Myc promoter drives Myc transcription; HK2 overexpression reverses AOC3-suppressive effects on glycolysis, lactylation, Myc expression, and imatinib resistance.","method":"AOC3 knockdown in GIST cell lines and patient samples, HK2 ubiquitination assay, ChIP for H3K18la at Myc promoter, HK2 overexpression rescue, in vivo xenograft model","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis established by rescue experiment, multiple orthogonal mechanistic assays; single lab","pmids":["41570175"],"is_preprint":false}],"current_model":"AOC3 (VAP-1) is a homodimeric, copper-containing primary amine oxidase expressed on the surface of endothelial cells, smooth muscle cells, and adipocytes whose TPQ-dependent catalytic activity is essential for its dual roles as: (1) a leukocyte extravasation regulator—mediating slow rolling, firm adhesion, and transmigration by directly acting as an endothelial adhesion molecule and by inducing E- and P-selectin expression through reactive products of amine oxidation; and (2) a metabolic enzyme in adipocytes—driving SSAO-dependent, insulin-mimetic glucose transport stimulation; additionally, AOC3 is shed as a soluble plasma form by metalloprotease-dependent cleavage, its expression is transcriptionally controlled by the MRTF-SRF pathway in smooth muscle cells, and its localization to endothelial lipid rafts enables cell-type-specific leukocyte adhesion function."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing VAP-1 as a novel endothelial adhesion molecule resolved how lymphocytes bind vascular endothelium independently of known selectins and integrins, revealing a sialic-acid-dependent adhesion pathway.","evidence":"Glycosidase digestion and flow-based adhesion assays with anti-VAP-1 blocking antibodies on endothelial cells","pmids":["8627168"],"confidence":"High","gaps":["Identity of the lymphocyte counterreceptor for VAP-1 was unknown","Whether enzymatic activity was required for adhesion was untested"]},{"year":1997,"claim":"Demonstrating that VAP-1 mediates subtype-specific leukocyte rolling under shear in vivo established it as a physiologically relevant adhesion molecule distinct from L-selectin, PSGL-1, and α4-integrin pathways.","evidence":"Intravital microscopy with multiple blocking antibodies in peripheral lymph nodes and flow-based assays","pmids":["9254657"],"confidence":"High","gaps":["Mechanism of lymphocyte subset selectivity not defined","Downstream signaling on engagement not characterized"]},{"year":1998,"claim":"Discovery of a circulating soluble form (sVAP-1) raised the question of whether AOC3 functions extend beyond cell-surface adhesion to systemic immunomodulation.","evidence":"Sandwich ELISA, immunoblotting, and lymphocyte adhesion assay on plasma-derived sVAP-1","pmids":["9686623"],"confidence":"Medium","gaps":["Mechanism of shedding was unknown","Physiological relevance of soluble form in vivo not established"]},{"year":2000,"claim":"Reconstitution of VAP-1-dependent adhesion in a transfected endothelial cell line, combined with mutagenesis showing dispensability of the RGD motif and enzymatic activity individually, and identification of CD44 as a counterreceptor activation pathway, began to dissect the structural requirements for adhesion.","evidence":"cDNA transfection, site-directed mutagenesis, rotatory and flow-chamber adhesion assays, antibody blocking","pmids":["10864915"],"confidence":"High","gaps":["Direct lymphocyte ligand for VAP-1 still unidentified","Relative contribution of enzymatic vs. structural adhesion not resolved"]},{"year":2001,"claim":"In vivo intravital imaging showed VAP-1 acts as a molecular brake during granulocyte rolling and is required for ~70% of extravasation, quantifying its contribution to the multi-step adhesion cascade.","evidence":"Intravital microscopy with anti-VAP-1 antibody blockade in rabbit peritoneal inflammation model","pmids":["11156953"],"confidence":"High","gaps":["Whether the antibody blocks enzymatic activity, adhesion, or both was unclear","Species generalizability not confirmed"]},{"year":2004,"claim":"Definitive proof that the TPQ-dependent oxidase activity is required for leukocyte transmigration resolved the long-standing question of whether AOC3 functions purely as an adhesion scaffold or requires catalysis; an enzymatically inactive point mutant abolished transmigration.","evidence":"Enzymatically inactive VAP-1 point mutant, specific amine oxidase inhibitors, flow-based in vitro assays and in vivo inflammation model","pmids":["14726375"],"confidence":"High","gaps":["Identity of endogenous substrate(s) driving transmigration unknown","Reactive products mediating downstream signaling not characterized"]},{"year":2004,"claim":"Identification of metalloprotease-dependent shedding as the mechanism generating soluble VAP-1 from adipocytes explained the origin of circulating sVAP-1 and linked it to TNFα-driven inflammation.","evidence":"Metalloprotease inhibitor (batimastat) blockade of sVAP-1 release from 3T3-L1 and human adipocyte explants stimulated with TNFα","pmids":["14968297"],"confidence":"Medium","gaps":["Specific metalloprotease identity not determined","Whether endothelial shedding follows the same mechanism was untested"]},{"year":2005,"claim":"AOC3 knockout mice established the gene as genetically required for slow rolling, firm adhesion, transmigration, and lymphocyte homing in vivo, providing the definitive loss-of-function genetic evidence for its role in the leukocyte extravasation cascade.","evidence":"AOC3 KO mice with intravital imaging, peritonitis model, and lymphocyte homing assays","pmids":["15664163"],"confidence":"High","gaps":["Could not distinguish whether loss of adhesion vs. loss of enzymatic activity caused the phenotype","Compensatory mechanisms in chronic KO not assessed"]},{"year":2006,"claim":"Discovery that VAP-1 oxidase activity induces E- and P-selectin transcription/translation on endothelial cells identified a feed-forward mechanism whereby amine oxidation products amplify the leukocyte adhesion cascade beyond VAP-1's own adhesive function.","evidence":"WT vs. enzymatically inactive VAP-1 transfectants and VAP-1-deficient mice carrying human VAP-1 transgene with gene/protein expression assays","pmids":["17548577"],"confidence":"High","gaps":["Specific oxidation product(s) responsible for selectin induction not identified","Signaling pathway from oxidation products to selectin gene transcription not mapped"]},{"year":2007,"claim":"Two key advances established AOC3's metabolic and immune tissue roles: AOC3 KO adipocytes lost benzylamine/methylamine-stimulated glucose transport while retaining insulin responses, proving the SSAO activity drives insulin-mimetic metabolic effects; separately, AOC3 KO mice showed defective mucosal immunity with reduced Peyer's patch lymphocytes and impaired antimicrobial responses.","evidence":"AOC3 KO adipocyte hexose transport assays; AOC3 KO mice with immunization, microbial challenge, flow cytometry","pmids":["17406965","17947691"],"confidence":"High","gaps":["Endogenous amine substrates driving glucose transport in vivo unidentified","Whether mucosal immune defect is purely homing-dependent or involves local signaling unclear"]},{"year":2011,"claim":"Crystal structures of AOC3 revealed the TPQ cofactor in on-copper and off-copper conformations with imidazole, and mutagenesis of active-site residues (Met211, Leu469) defined determinants of substrate specificity; concurrent kinetic isotope effect studies established C–H bond breakage as rate-limiting for TPQ reduction, providing a detailed enzymological framework.","evidence":"X-ray crystallography at 2.6–2.95 Å, site-directed mutagenesis, steady-state kinetics with KIE and pH-dependence analysis","pmids":["21585208","21737458"],"confidence":"High","gaps":["No structure of AOC3 with a physiological substrate bound","Mechanism of substrate channeling in the homodimer not addressed"]},{"year":2011,"claim":"Localization of AOC3 to lipid rafts specifically in endothelial cells (not smooth muscle cells) explained cell-type-specific leukocyte adhesion function, separating the adhesion role from the broader tissue expression pattern.","evidence":"Lipid raft fractionation and leukocyte adhesion assays comparing stably transfected endothelial vs. smooth muscle cells","pmids":["21819380"],"confidence":"Medium","gaps":["Lipid raft targeting signal within AOC3 not mapped","Whether raft localization is required for enzymatic activity not tested"]},{"year":2012,"claim":"Systematic substrate profiling of purified human AOC3 defined its catalytic efficiency across primary amines and showed Km(O2) approximates interstitial oxygen tension, suggesting the enzyme is tuned to physiological oxygen availability.","evidence":"Recombinant enzyme from insect cells, in vitro kinetics with multiple substrates, whole-cell kinetics on 3T3-L1 adipocytes","pmids":["22238597"],"confidence":"High","gaps":["In vivo substrate concentrations and identity of primary endogenous substrate(s) remain uncertain","Oxygen-sensing implications not tested in intact organisms"]},{"year":2013,"claim":"Oxidase-null knock-in mice phenocopied full AOC3 knockouts in peritonitis and arthritis, definitively separating the catalytic function from any structural/adhesion role and establishing that the enzymatic activity alone accounts for the pro-inflammatory phenotype.","evidence":"Oxidase-null knock-in mouse compared to KO in sterile peritonitis and antibody-induced arthritis models","pmids":["23885334"],"confidence":"High","gaps":["Whether adhesion-only function exists in other inflammatory contexts not excluded","Nature of endogenous substrates at inflamed sites not identified"]},{"year":2013,"claim":"Crystal structures of AOC3 with pyridazinone inhibitors revealed a reversible binding site in the active-site channel and identified species-specific residues affecting inhibitor affinity, advancing structure-based drug design.","evidence":"X-ray crystallography of inhibitor–VAP-1 complexes, enzyme inhibition assays, homology modeling for species comparison","pmids":["24304424"],"confidence":"High","gaps":["In vivo efficacy of pyridazinone-class inhibitors not reported","Selectivity over other copper amine oxidases not fully characterized"]},{"year":2020,"claim":"Parallel comparison of AOC3 KO and oxidase-null knock-in mice established that loss of catalytic activity causes increased adiposity and loss of benzylamine-stimulated glucose transport, with downregulated adipose inflammatory markers — unifying the metabolic and anti-inflammatory consequences of AOC3 enzymatic function.","evidence":"Body composition analysis, adipocyte glucose transport assay, inflammatory marker expression in KO vs. oxidase-null knock-in mice","pmids":["32712883"],"confidence":"High","gaps":["Mechanism linking amine oxidation to glucose transporter translocation not resolved","Whether increased adiposity reflects developmental compensation or acute metabolic role unclear"]},{"year":2021,"claim":"Identification of the MRTF–SRF pathway as a transcriptional regulator of AOC3 in smooth muscle cells, with KDM3A-dependent chromatin remodeling, provided the first defined transcriptional control mechanism for AOC3 expression.","evidence":"MRTF overexpression, SRF siRNA knockdown, promoter reporter assay, ChIP for SRF binding in human SMCs","pmids":["33727640"],"confidence":"Medium","gaps":["Whether MRTF–SRF controls AOC3 in endothelial cells or adipocytes not tested","Upstream signals regulating MRTF activity toward AOC3 not identified"]},{"year":2024,"claim":"A non-canonical role for AOC3 was identified in GIST cells where its loss stabilizes HK2 by reducing ubiquitin-mediated degradation, enhancing glycolysis and H3K18 lactylation at the Myc promoter to drive Myc-dependent imatinib resistance.","evidence":"AOC3 knockdown in GIST cell lines, HK2 ubiquitination assay, ChIP for H3K18la, HK2 overexpression rescue, xenograft model","pmids":["41570175"],"confidence":"Medium","gaps":["Whether AOC3 enzymatic activity or protein scaffolding drives HK2 destabilization not resolved","Not independently replicated; relevance to non-GIST cancers unknown","Mechanism of AOC3-dependent HK2 ubiquitination (E3 ligase identity) not identified"]},{"year":null,"claim":"The identity of the endogenous leukocyte counterreceptor for AOC3 and the specific endogenous amine substrates oxidized at sites of inflammation to drive the extravasation cascade remain unresolved; the mechanism linking amine oxidation products to glucose transporter translocation in adipocytes is also undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["Leukocyte counterreceptor identity unknown","Endogenous substrate(s) at inflammatory sites not identified","Signaling from oxidation products to GLUT4 translocation not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[5,13,16,17,18]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,3,4,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,15,17]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[2,6]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,4,5,7,8,10,18]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[17,23,24,26]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,3,7,15]}],"complexes":[],"partners":["SRF","MKL1","KDM3A","NKX2-3","HK2"],"other_free_text":[]},"mechanistic_narrative":"AOC3 (VAP-1) is a copper-containing, TPQ-dependent primary amine oxidase that functions both as an endothelial adhesion molecule mediating leukocyte extravasation and as a metabolic enzyme in adipocytes driving insulin-mimetic glucose transport. On endothelial cells, AOC3 localizes to lipid rafts as a homodimer and mediates sialic-acid-dependent lymphocyte rolling, firm adhesion, and transmigration; its catalytic activity is essential for these functions, as oxidase-null knock-in mice phenocopy full knockouts in peritonitis and arthritis models, and the reactive products of amine oxidation induce endothelial E- and P-selectin expression to amplify leukocyte recruitment [PMID:15664163, PMID:23885334, PMID:17548577, PMID:14726375]. In adipocytes, AOC3-catalyzed oxidation of substrates such as benzylamine stimulates glucose uptake independently of the insulin receptor, and loss of this activity leads to increased adiposity and altered adipose inflammatory tone [PMID:17406965, PMID:32712883]. A soluble form generated by metalloprotease-dependent ectodomain shedding circulates in plasma and retains modulatory activity on lymphocyte adhesion [PMID:9686623, PMID:14968297]."},"prefetch_data":{"uniprot":{"accession":"Q16853","full_name":"Amine oxidase [copper-containing] 3","aliases":["Amine oxidase copper-containing 3","Copper amine oxidase","HPAO","Semicarbazide-sensitive amine oxidase","SSAO","Vascular adhesion protein 1","VAP-1"],"length_aa":763,"mass_kda":84.6,"function":"Catalyzes the oxidative deamination of primary amines to the corresponding aldehydes with the concomitant production of hydrogen peroxide and ammonia (PubMed:19588076, PubMed:24304424, PubMed:9653080). Has a preference for the primary monoamines methylamine and benzylamine (PubMed:19588076, PubMed:9653080). Could also act on 2-phenylethylamine but much less efficiently (PubMed:19588076). At endothelial cells surface can also function as a cell adhesion protein that participates in lymphocyte extravasation and recirculation by mediating the binding of lymphocytes to peripheral lymph node vascular endothelial cells in an L-selectin-independent fashion (PubMed:9254657, PubMed:9653080) Has no semicarbazide-sensitive amine oxidase (SSAO) activity","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q16853/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AOC3","classification":"Not Classified","n_dependent_lines":25,"n_total_lines":1208,"dependency_fraction":0.020695364238410598},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AOC3","total_profiled":1310},"omim":[{"mim_id":"603735","title":"AMINE OXIDASE, COPPER-CONTAINING, 3; AOC3","url":"https://www.omim.org/entry/603735"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"adipose tissue","ntpm":397.0},{"tissue":"blood vessel","ntpm":328.7}],"url":"https://www.proteinatlas.org/search/AOC3"},"hgnc":{"alias_symbol":["VAP1","HPAO","VAP-1"],"prev_symbol":[]},"alphafold":{"accession":"Q16853","domains":[{"cath_id":"3.10.450.40","chopping":"66-166","consensus_level":"high","plddt":97.6487,"start":66,"end":166},{"cath_id":"3.10.450.40","chopping":"174-284","consensus_level":"high","plddt":96.4401,"start":174,"end":284},{"cath_id":"2.70.98.20","chopping":"337-392_467-719","consensus_level":"high","plddt":98.3579,"start":337,"end":719}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16853","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q16853-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q16853-F1-predicted_aligned_error_v6.png","plddt_mean":94.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AOC3","jax_strain_url":"https://www.jax.org/strain/search?query=AOC3"},"sequence":{"accession":"Q16853","fasta_url":"https://rest.uniprot.org/uniprotkb/Q16853.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q16853/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16853"}},"corpus_meta":[{"pmid":"16688218","id":"PMC_16688218","title":"Crystal 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30658395","citation_count":12,"is_preprint":false},{"pmid":"35174543","id":"PMC_35174543","title":"Downregulation of VAP-1 in OSCC suppresses tumor growth and metastasis via NF-κB/IL-8 signaling and reduces neutrophil infiltration.","date":"2022","source":"Journal of oral pathology & medicine : official publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology","url":"https://pubmed.ncbi.nlm.nih.gov/35174543","citation_count":11,"is_preprint":false},{"pmid":"17393062","id":"PMC_17393062","title":"Characterization of A7r5 cell line transfected in a stable form by hSSAO/VAP-1 gene (A7r5 hSSAO/VAP-1 cell line).","date":"2007","source":"Journal of neural transmission (Vienna, Austria : 1996)","url":"https://pubmed.ncbi.nlm.nih.gov/17393062","citation_count":11,"is_preprint":false},{"pmid":"15922392","id":"PMC_15922392","title":"Severe cell fragmentation in the endothelial cell apoptosis induced by snake apoptosis toxin VAP1 is an apoptotic characteristic controlled by caspases.","date":"2005","source":"Toxicon : official journal of the International Society on Toxinology","url":"https://pubmed.ncbi.nlm.nih.gov/15922392","citation_count":10,"is_preprint":false},{"pmid":"18926840","id":"PMC_18926840","title":"Expression of mRNAs coding for VAP1/crotastatin-like metalloproteases in the venom glands of three South American pit vipers assessed by quantitative real-time PCR.","date":"2008","source":"Toxicon : official journal of the International Society on Toxinology","url":"https://pubmed.ncbi.nlm.nih.gov/18926840","citation_count":9,"is_preprint":false},{"pmid":"17393063","id":"PMC_17393063","title":"L-lysine as a recognition molecule for the VAP-1 function of SSAO.","date":"2007","source":"Journal of neural transmission (Vienna, Austria : 1996)","url":"https://pubmed.ncbi.nlm.nih.gov/17393063","citation_count":9,"is_preprint":false},{"pmid":"15736124","id":"PMC_15736124","title":"VAP1, with cystatin C motif, an oocyte protein encoded by a novel ovarian-specific gene during oogenesis in the common brushtail possum (Trichosurus vulpecula).","date":"2005","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/15736124","citation_count":8,"is_preprint":false},{"pmid":"27997774","id":"PMC_27997774","title":"Assessment of the Relationship Between Serum Vascular Adhesion Protein-1 (VAP-1) and Severity of Calcific Aortic Valve Stenosis.","date":"2015","source":"The Journal of heart valve disease","url":"https://pubmed.ncbi.nlm.nih.gov/27997774","citation_count":7,"is_preprint":false},{"pmid":"39296147","id":"PMC_39296147","title":"AOC3 accelerates lung metastasis of osteosarcoma by recruiting tumor-associated neutrophils, neutrophil extracellular trap formation and tumor vascularization.","date":"2024","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/39296147","citation_count":6,"is_preprint":false},{"pmid":"32959205","id":"PMC_32959205","title":"Circulating vascular adhesion protein-1(VAP-1): a possible biomarker for liver fibrosis associated with chronic hepatitis B and C.","date":"2020","source":"Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology]","url":"https://pubmed.ncbi.nlm.nih.gov/32959205","citation_count":6,"is_preprint":false},{"pmid":"31094153","id":"PMC_31094153","title":"Effector gene vap1 based DGGE fingerprinting to assess variation within and among Heterodera schachtii populations.","date":"2018","source":"Journal of nematology","url":"https://pubmed.ncbi.nlm.nih.gov/31094153","citation_count":5,"is_preprint":false},{"pmid":"20012150","id":"PMC_20012150","title":"Histamine oxidation in mouse adipose tissue is controlled by the AOC3 gene-encoded amine oxidase.","date":"2010","source":"Inflammation research : official journal of the European Histamine Research Society ... [et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/20012150","citation_count":5,"is_preprint":false},{"pmid":"37774061","id":"PMC_37774061","title":"Identification of AOC3 and LRRC17 as Colonic Fibroblast Activation Markers and Their Potential Roles in Colorectal Cancer Progression.","date":"2023","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/37774061","citation_count":4,"is_preprint":false},{"pmid":"36176983","id":"PMC_36176983","title":"Increased atherosclerotic plaque in AOC3 knock-out in ApoE-/- mice and characterization of AOC3 in atherosclerotic human coronary arteries.","date":"2022","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36176983","citation_count":4,"is_preprint":false},{"pmid":"23397320","id":"PMC_23397320","title":"Lack of association between VAP-1/SSAO activity and corneal neovascularization in a rabbit model.","date":"2013","source":"Journal of neural transmission (Vienna, Austria : 1996)","url":"https://pubmed.ncbi.nlm.nih.gov/23397320","citation_count":4,"is_preprint":false},{"pmid":"25572340","id":"PMC_25572340","title":"Glitazones inhibit human monoamine oxidase but their anti-inflammatory actions are not mediated by VAP-1/semicarbazide-sensitive amine oxidase inhibition.","date":"2015","source":"Journal of physiology and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25572340","citation_count":4,"is_preprint":false},{"pmid":"38855169","id":"PMC_38855169","title":"Association Between Vascular Adhesion Protein-1 (VAP-1) and MACE in Patients with Coronary Heart Disease: A Cohort Study.","date":"2024","source":"Journal of inflammation research","url":"https://pubmed.ncbi.nlm.nih.gov/38855169","citation_count":4,"is_preprint":false},{"pmid":"35507758","id":"PMC_35507758","title":"ω-(5-Phenyl-2H-tetrazol-2-yl)alkyl-substituted hydrazides and related compounds as inhibitors of amine oxidase copper containing 3 (AOC3).","date":"2022","source":"Archiv der Pharmazie","url":"https://pubmed.ncbi.nlm.nih.gov/35507758","citation_count":3,"is_preprint":false},{"pmid":"38142562","id":"PMC_38142562","title":"ω-(5-Phenyl-2H-tetrazol-2-yl)alkyl-substituted glycine amides and related compounds as inhibitors of the amine oxidase vascular adhesion protein-1 (VAP-1).","date":"2023","source":"Bioorganic & medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38142562","citation_count":3,"is_preprint":false},{"pmid":"40396328","id":"PMC_40396328","title":"Therapeutic Potential of Vascular Adhesion Protein-1 (VAP-1)/Semicarbazide-Sensitive Amine Oxidase (SSAO) Inhibitors: Current Medicinal Chemistry and Emerging Opportunities.","date":"2025","source":"Medicinal research reviews","url":"https://pubmed.ncbi.nlm.nih.gov/40396328","citation_count":3,"is_preprint":false},{"pmid":"1478972","id":"PMC_1478972","title":"A novel vesicle-associated protein (VAP-1) in sea urchin eggs containing multiple RNA-binding consensus sequences.","date":"1992","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/1478972","citation_count":3,"is_preprint":false},{"pmid":"40458597","id":"PMC_40458597","title":"The role of VAP-1 in cardiovascular disease: a review.","date":"2025","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40458597","citation_count":2,"is_preprint":false},{"pmid":"38741586","id":"PMC_38741586","title":"The first selective VAP-1 inhibitor in China, TT-01025-CL: safety, tolerability, pharmacokinetics, and pharmacodynamics of single- and multiple-ascending doses.","date":"2024","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38741586","citation_count":2,"is_preprint":false},{"pmid":"39187313","id":"PMC_39187313","title":"Amine Oxidase, Copper Containing 3 (Aoc3) Knockout Mice Are More Prone to DSS-induced Colitis and Colonic Tumorigenesis.","date":"2024","source":"In vivo (Athens, Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/39187313","citation_count":1,"is_preprint":false},{"pmid":"24379274","id":"PMC_24379274","title":"VAP-1 in peritoneally dialyzed patients.","date":"2013","source":"Postepy higieny i medycyny doswiadczalnej (Online)","url":"https://pubmed.ncbi.nlm.nih.gov/24379274","citation_count":1,"is_preprint":false},{"pmid":"17083159","id":"PMC_17083159","title":"[Vascular adhesion protein-1 (VAP-1) in inflammatory process].","date":"2006","source":"Przeglad lekarski","url":"https://pubmed.ncbi.nlm.nih.gov/17083159","citation_count":1,"is_preprint":false},{"pmid":"41021158","id":"PMC_41021158","title":"Pan-cancer analysis reveals AOC3 as a potential therapeutic biomarker for colorectal cancer.","date":"2025","source":"Discover oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41021158","citation_count":0,"is_preprint":false},{"pmid":"41570175","id":"PMC_41570175","title":"AOC3 Loss Promotes Imatinib Resistance in GIST by Stabilizing HK2 and Enhancing H3K18la-Driven Myc Transcription.","date":"2026","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/41570175","citation_count":0,"is_preprint":false},{"pmid":"41420234","id":"PMC_41420234","title":"Proof-of-concept PET imaging of pulmonary sarcoidosis using VAP-1-targeted radiotracer [68Ga]Ga-DOTA-Siglec-9.","date":"2025","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/41420234","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51145,"output_tokens":7113,"usd":0.130065},"stage2":{"model":"claude-opus-4-6","input_tokens":10858,"output_tokens":4130,"usd":0.23631},"total_usd":0.366375,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"VAP-1 (AOC3) mediates lymphocyte binding to endothelial cells in a sialic acid-dependent, L-selectin-independent manner; desialylation of VAP-1 abolishes its adhesive function, and it naturally exists as a 170-kDa sialoglycoprotein on the luminal surface of vessels.\",\n      \"method\": \"Glycosidase digestion, flow-based adhesion assays, anti-VAP-1 monoclonal antibody blocking\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (biochemical, functional blocking) in a high-citation foundational paper\",\n      \"pmids\": [\"8627168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"VAP-1 mediates subtype-specific (CD8+ T cells and NK cells) rolling adhesion to peripheral lymph node HEVs under shear stress, independently of L-selectin, PSGL-1, and α4 integrins; intravital microscopy confirmed VAP-1 involvement in initial leukocyte–endothelial contacts in vivo.\",\n      \"method\": \"Flow-based adhesion assays with blocking antibodies, intravital microscopy\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal blocking with multiple antibodies plus in vivo intravital imaging, high citation count\",\n      \"pmids\": [\"9254657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"A soluble circulating form of VAP-1 (sVAP-1) exists in plasma with slightly higher apparent molecular mass than transmembrane VAP-1 under non-reducing conditions but identical mobility after reduction; sVAP-1 retains the ability to modulate lymphocyte binding to endothelial cells.\",\n      \"method\": \"Sandwich ELISA, immunoblotting, lymphocyte adhesion assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional adhesion assay combined with biochemical characterization in single study\",\n      \"pmids\": [\"9686623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Recombinant VAP-1 transfected into an endothelial cell line reconstitutes shear-dependent lymphocyte adhesion; the RGD integrin-binding motif and the enzymatic (monoamine oxidase) activity are not individually indispensable for adhesion, but CD44 ligation on lymphocytes markedly upregulates VAP-1-dependent adhesion, identifying a counterreceptor activation pathway.\",\n      \"method\": \"cDNA transfection into endothelial cell line, rotatory and flow-chamber adhesion assays, site-directed mutagenesis, antibody blocking\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in cell line plus mutagenesis plus functional blocking, replicated across multiple assay formats\",\n      \"pmids\": [\"10864915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"VAP-1 functions as a molecular brake during granulocyte rolling, increasing rolling velocity and jerky skipping when blocked; anti-VAP-1 antibodies reduced granulocyte extravasation by ~70% and firm adhesion by 44% in vivo.\",\n      \"method\": \"Intravital microscopy with anti-VAP-1 monoclonal antibody blockade in rabbit inflammation model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo intravital microscopy with quantified rolling/adhesion parameters, high citation count\",\n      \"pmids\": [\"11156953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The oxidase (amine oxidase) enzymatic activity of VAP-1 is required for PMN transmigration through the endothelium; an enzymatically inactive point mutant abolished VAP-1-mediated transmigration, and amine oxidase inhibitors blocked PMN rolling and transmigration under laminar shear stress in vitro and PMN extravasation in vivo.\",\n      \"method\": \"Enzymatically inactive VAP-1 point mutant, specific amine oxidase inhibitors, flow-based in vitro assays, in vivo inflammation model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — active-site mutagenesis combined with pharmacological inhibition and in vivo validation; high citation count\",\n      \"pmids\": [\"14726375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Adipocytes (3T3-L1 and human adipose tissue explants) release a soluble form of VAP-1/SSAO by metalloprotease-dependent shedding of the membrane form; this release is stimulated by TNF-α and blocked by the metalloprotease inhibitor batimastat.\",\n      \"method\": \"Culture medium collection, VAP-1 immunoprecipitation/Western blot, metalloprotease inhibitor (batimastat), TNF-α stimulation of adipocytes\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological metalloprotease inhibition identifies shedding mechanism; single lab, moderate evidence\",\n      \"pmids\": [\"14968297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"AOC3-deficient mice show impaired slow rolling, firm adhesion, and transmigration of leukocytes at inflammatory sites and lymphoid tissues; AOC3 knockout results in reduced lymphocyte homing to lymphoid organs and attenuated peritonitis, establishing the endothelial amine oxidase as a required mediator of the leukocyte extravasation cascade in vivo.\",\n      \"method\": \"Gene knockout mouse model, real-time intravital imaging, peritonitis model, lymphocyte homing assay\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple in vivo phenotypic readouts and real-time imaging; high citation count\",\n      \"pmids\": [\"15664163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The oxidase activity of VAP-1 induces transcription and translation of endothelial E- and P-selectins; using WT vs. enzymatically inactive VAP-1 point mutant transfectants and VAP-1-deficient mice carrying human VAP-1 transgene, P-selectin induction was shown to be enzyme-activity-dependent in vivo, leading to enhanced lymphocyte binding.\",\n      \"method\": \"Endothelial cell transfection with WT and enzymatically inactive VAP-1 mutant, VAP-1-deficient + humanized transgenic mice, gene/protein expression assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis in cell lines corroborated by transgenic rescue in vivo; multiple orthogonal methods\",\n      \"pmids\": [\"17548577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"VAP-1 is expressed in smooth muscle cells as early as embryonic week 7 and is enzymatically active in fetal vessels; fetal VAP-1 is dimerized and functionally mediates cord blood lymphocyte rolling and firm adhesion under shear stress.\",\n      \"method\": \"Immunohistochemistry of human fetal tissues, enzymatic activity assay, adenoviral transfection of HUVEC, flow-based adhesion assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay plus enzymatic characterization; single lab\",\n      \"pmids\": [\"16556889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AOC3/VAP-1-deficient mice show age-dependent paucity of lymphocytes in Peyer's patches, lower serum IgA, defective oral immunization responses, and impaired antimicrobial immune responses against S. aureus and coxsackie B4 virus, demonstrating VAP-1 is required for normal mucosal immunity.\",\n      \"method\": \"AOC3 knockout mouse model, immunization, microbial challenge, flow cytometry, immunoglobulin quantification\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple defined immune phenotypes across multiple challenge models\",\n      \"pmids\": [\"17947691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VAP-1 enzymatic activity mediates intestinal damage and acute lung injury after ischemia-reperfusion; VAP-1-deficient mice show attenuated injury, and separate inhibition with small molecule enzyme inhibitors or function-blocking antibody in WT mice confirms that the catalytic activity drives the pro-inflammatory response.\",\n      \"method\": \"VAP-1 KO mice, humanized VAP-1 transgenic mice, small molecule enzyme inhibitors, function-blocking antibody, ischemia-reperfusion injury model\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus pharmacological inhibition plus transgenic rescue; multiple orthogonal approaches\",\n      \"pmids\": [\"18991279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Membrane-bound SSAO/VAP-1 catalytic activity induces vascular cell death via p53 phosphorylation and PUMA-α induction, leading to mitochondrial Bcl-2 family protein alterations and effector caspase activation, upon methylamine substrate oxidation.\",\n      \"method\": \"Stable transfection of smooth muscle cell line with hSSAO/VAP-1, substrate (methylamine) treatment, Western blot for p53/PUMA/Bcl-2, caspase activity assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway dissection in transfected cell model with multiple readouts; single lab\",\n      \"pmids\": [\"18348872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structures of soluble AOC3 (sAOC3) reveal two imidazole binding sites: one where imidazole hydrogen-bonds to the TPQ cofactor in the inactive on-copper conformation, and another covalently bound to the active off-copper TPQ conformation; single-residue mutagenesis (Met211, Leu469) identifies these as key determinants of substrate specificity.\",\n      \"method\": \"X-ray crystallography (2.6 Å and 2.95 Å structures), site-directed mutagenesis of active-site residues, enzyme activity assays with multiple substrates, computational docking\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures combined with mutagenesis and enzymatic activity assays, multiple substrates tested\",\n      \"pmids\": [\"21585208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAP-1-mediated IL-1β-induced M2 macrophage infiltration underlies lymph- and angiogenesis; VAP-1 is expressed in blood but not lymphatic endothelium in vivo, and VAP-1 inhibition blocks IL-1β-induced but not VEGF-A-induced angiogenesis and lymphangiogenesis.\",\n      \"method\": \"Corneal micropocket assay, in vivo molecular imaging, VAP-1 inhibitor, immunohistochemistry\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo functional assay with pharmacological inhibition, single lab\",\n      \"pmids\": [\"21435467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Engineered endothelial cells stably expressing human SSAO/VAP-1 show the protein is localized to lipid rafts of the plasma membrane as a dimer and mediates leukocyte adhesion to the endothelium; SSAO/VAP-1 in smooth muscle cells (expressing 3-fold higher protein) does not mediate leukocyte adhesion, indicating cell-type-specific function.\",\n      \"method\": \"Stable transfection, lipid raft fractionation, immunofluorescence, leukocyte adhesion assay\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — subcellular localization with functional consequence demonstrated; single lab, two cell types compared\",\n      \"pmids\": [\"21819380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAP-1 reaction with primary amines is mechanistically characterized: a KIE of ~6–7.6 on kcat/Km with d2-benzylamine indicates an isotopically sensitive step in substrate binding/oxidation; large KIE on kcat with phenylethylamine (8.01) shows C-H bond breakage is rate-limiting for TPQ reduction; two macroscopic pKa values govern kcat as a function of pH.\",\n      \"method\": \"In vitro steady-state kinetics with soluble recombinant VAP-1, kinetic isotope effects (KIE), pH-dependence analysis, QSAR with para-substituted substrates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous in vitro mechanistic enzyme kinetics with isotope effects and pH analysis\",\n      \"pmids\": [\"21737458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Purified human AOC3 contains a TPQ cofactor (~6% titer) and oxidizes a broad range of primary amines (kcat/Km 10²–10⁴ M⁻¹s⁻¹); Km(O2) approximates interstitial oxygen partial pressure; dopamine and cysteamine are among the substrates with relatively high efficiency, implicating roles in insulin signaling and fatty acid metabolism; AOC3 is uniformly distributed on the adipocyte cell surface as confirmed by whole-cell kinetics matching purified enzyme.\",\n      \"method\": \"Recombinant enzyme expression in insect cells, in vitro enzyme kinetics, substrate profiling, cell-surface distribution imaging of 3T3-L1 adipocytes\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purified recombinant enzyme with systematic substrate profiling, corroborated by whole-cell kinetics\",\n      \"pmids\": [\"22238597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AOC3/VAP-1 oxidase activity-null knock-in mice (expressing catalytically inactive VAP-1 protein) phenocopy AOC3 KO mice in sterile peritonitis and antibody-induced arthritis models, demonstrating that the oxidase catalytic activity is responsible for the inflammatory function of VAP-1 in vivo.\",\n      \"method\": \"Oxidase-null knock-in mouse generation, peritonitis model, antibody-induced arthritis model, comparison to KO mice\",\n      \"journal\": \"American journal of clinical and experimental immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knock-in mutagenesis in vivo, two independent inflammatory models\",\n      \"pmids\": [\"23885334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structures of VAP-1 complexed with novel pyridazinone inhibitors reveal a unique reversible binding site in the active site channel; species-specific binding is explained by specific amino acid differences between human and rodent VAP-1 identified by structural comparison.\",\n      \"method\": \"X-ray crystallography of inhibitor–VAP-1 complexes, homology modeling, enzyme inhibition assays\",\n      \"journal\": \"Journal of medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple crystal structures with functional inhibition data and mutagenic rationale\",\n      \"pmids\": [\"24304424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VAP-1 inhibition with a small molecule reduces myeloid cell recruitment to pulmonary metastatic sites and decreases tumor cell survival; simultaneous inhibition of VCAM-1 and VAP-1 does not produce additive effects, suggesting closely related downstream mechanisms.\",\n      \"method\": \"VAP-1 small molecule inhibitor, VCAM-1 blocking antibody, murine pulmonary metastasis model, myeloid cell quantification\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo functional model with pharmacological inhibition; epistasis-like inference from combinatorial blockade\",\n      \"pmids\": [\"23407548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AOC3/VAP-1 expression in endothelial cells enhances susceptibility to oxygen-glucose deprivation (OGD); its enzymatic activity amplifies vascular cell damage through substrate oxidation (methylamine); OGD induces metalloprotease-2-dependent shedding of soluble SSAO/VAP-1; OGD induces SSAO/VAP-1-dependent leukocyte adhesion partly through enzymatic activity.\",\n      \"method\": \"Endothelial cells stably expressing hSSAO/VAP-1 subjected to OGD, metalloprotease inhibitors, Western blot for caspase-3/8, leukocyte adhesion assay\",\n      \"journal\": \"Cerebrovascular diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple mechanistic readouts in a cell model with specific inhibitors; single lab\",\n      \"pmids\": [\"24503888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AOC3/VAP-1 contributes transiently to antigen-specific CD4+ T-cell traffic to bronchial draining lymph nodes (89% reduction at day 3) in an OVA tracheal allergen model, but this difference was absent at day 6; dispersal of effector cells to lung and tracheal mucosa is AOC3-independent.\",\n      \"method\": \"AOC3 KO mice, OVA-specific CD4+ T-cell tracking kinetic model, flow cytometry\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with quantitative kinetic tracking of antigen-specific cells; single lab\",\n      \"pmids\": [\"25116373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AOC3 (VAP-1) in adipocytes is the enzyme encoded by the AOC3 gene responsible for SSAO-dependent insulin-like stimulation of glucose transport; adipocytes from AOC3 KO mice fail to respond to benzylamine, methylamine, and tyramine with increased glucose uptake while insulin responsiveness is preserved, proving the effect is oxidation-dependent rather than receptor-mediated.\",\n      \"method\": \"AOC3 knockout mouse adipocytes, hexose transport assay, SSAO activity measurement\",\n      \"journal\": \"Journal of neural transmission\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with specific functional readout; clean loss-of-function establishes causal mechanism\",\n      \"pmids\": [\"17406965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Histamine oxidation in mouse adipose tissue is predominantly controlled by AOC3-encoded SSAO; in AOC3 KO mice, benzylamine and histamine oxidation are abolished in adipose tissue but histamine oxidation persists in the intestine (controlled by AOC1/diamine oxidase); when protected from SSAO-mediated oxidation, histamine moderately stimulates lipolysis in adipocytes.\",\n      \"method\": \"AOC3 KO mice, enzyme activity assays in tissue homogenates, qRT-PCR, lipolysis (glycerol release) in isolated adipocytes\",\n      \"journal\": \"Inflammation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with tissue-specific enzyme activity and functional lipolysis assay; single lab\",\n      \"pmids\": [\"20012150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SSAO/VAP-1 expression in endothelial cells promotes BBB dysfunction associated with Alzheimer's disease by altering release of pro-inflammatory angioneurins (IL-6, IL-8, VEGF), decreasing tight-junction proteins (ZO-1, claudin-5), and increasing vascular Aβ deposition through both activity-dependent and -independent mechanisms.\",\n      \"method\": \"In vitro BBB model with SSAO/VAP-1-expressing endothelial cells, cytokine ELISA, Western blot for tight-junction proteins, permeability assay, leukocyte adhesion assay, Aβ deposition assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple mechanistic readouts in transfected cell model; single lab\",\n      \"pmids\": [\"31047972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Both AOC3 KO and AOC3 oxidase-null knock-in mice are heavier and fatter than controls with loss of benzylamine insulin-like action in adipocytes but preserved insulin lipogenic responsiveness; downregulated inflammatory markers in adipose tissue; the metabolic phenotype is reproduced by oxidase-null knock-in alone, demonstrating that the enzymatic activity is responsible for these metabolic functions.\",\n      \"method\": \"AOC3 KO and AOC3 knock-in (oxidase-null) mice compared, body composition analysis, adipocyte glucose transport assay, inflammatory marker expression\",\n      \"journal\": \"Journal of physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — parallel genetic models (KO vs. catalytic knock-in) with multiple metabolic phenotypes; mechanistic conclusion replicated across two complementary models\",\n      \"pmids\": [\"32712883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AOC3 expression in smooth muscle cells is transcriptionally regulated by myocardin-related transcription factors (MRTFs: MYOCD, MRTF-A/MKL1, MRTF-B/MKL2) acting through serum response factor (SRF); the AOC3 gene locus contains SRF binding sites; SRF silencing reduces AOC3 transcripts; MRTF-A/MKL1 increases AOC3 promoter reporter activity via KDM3A chromatin remodeling.\",\n      \"method\": \"MRTF overexpression in human SMCs, SRF siRNA knockdown, promoter reporter assay, ChIP/SRF binding site analysis, KDM3A co-regulation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter combined with gene knockdown and overexpression; single lab, bioinformatics corroborated by functional experiments\",\n      \"pmids\": [\"33727640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AOC3 is expressed on the surface of pericryptal myofibroblasts (identified as the target of mAb PR2D3) and its expression is sensitive to trypsin/collagenase digestion; TGFβ substantially downregulates AOC3 in myofibroblasts but not in skin fibroblasts; knockdown of NKX2-3 (co-expressed with AOC3 in myofibroblasts) decreases myofibroblast gene expression including AOC3 and increases fibroblast marker SHOX2.\",\n      \"method\": \"mAb target identification, immunofluorescence, FACS sorting, TGFβ treatment, whole-genome microarray, NKX2-3 knockdown\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — antibody target identification plus functional NKX2-3 KD placing AOC3 downstream of NKX2-3 in myofibroblast maintenance\",\n      \"pmids\": [\"27036009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AOC3 loss in GIST cells stabilizes HK2 by attenuating ubiquitin-mediated degradation, leading to enhanced glycolysis and lactate production; elevated H3K18 lactylation at the Myc promoter drives Myc transcription; HK2 overexpression reverses AOC3-suppressive effects on glycolysis, lactylation, Myc expression, and imatinib resistance.\",\n      \"method\": \"AOC3 knockdown in GIST cell lines and patient samples, HK2 ubiquitination assay, ChIP for H3K18la at Myc promoter, HK2 overexpression rescue, in vivo xenograft model\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established by rescue experiment, multiple orthogonal mechanistic assays; single lab\",\n      \"pmids\": [\"41570175\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AOC3 (VAP-1) is a homodimeric, copper-containing primary amine oxidase expressed on the surface of endothelial cells, smooth muscle cells, and adipocytes whose TPQ-dependent catalytic activity is essential for its dual roles as: (1) a leukocyte extravasation regulator—mediating slow rolling, firm adhesion, and transmigration by directly acting as an endothelial adhesion molecule and by inducing E- and P-selectin expression through reactive products of amine oxidation; and (2) a metabolic enzyme in adipocytes—driving SSAO-dependent, insulin-mimetic glucose transport stimulation; additionally, AOC3 is shed as a soluble plasma form by metalloprotease-dependent cleavage, its expression is transcriptionally controlled by the MRTF-SRF pathway in smooth muscle cells, and its localization to endothelial lipid rafts enables cell-type-specific leukocyte adhesion function.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AOC3 (VAP-1) is a copper-containing, TPQ-dependent primary amine oxidase that functions both as an endothelial adhesion molecule mediating leukocyte extravasation and as a metabolic enzyme in adipocytes driving insulin-mimetic glucose transport. On endothelial cells, AOC3 localizes to lipid rafts as a homodimer and mediates sialic-acid-dependent lymphocyte rolling, firm adhesion, and transmigration; its catalytic activity is essential for these functions, as oxidase-null knock-in mice phenocopy full knockouts in peritonitis and arthritis models, and the reactive products of amine oxidation induce endothelial E- and P-selectin expression to amplify leukocyte recruitment [PMID:15664163, PMID:23885334, PMID:17548577, PMID:14726375]. In adipocytes, AOC3-catalyzed oxidation of substrates such as benzylamine stimulates glucose uptake independently of the insulin receptor, and loss of this activity leads to increased adiposity and altered adipose inflammatory tone [PMID:17406965, PMID:32712883]. A soluble form generated by metalloprotease-dependent ectodomain shedding circulates in plasma and retains modulatory activity on lymphocyte adhesion [PMID:9686623, PMID:14968297].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing VAP-1 as a novel endothelial adhesion molecule resolved how lymphocytes bind vascular endothelium independently of known selectins and integrins, revealing a sialic-acid-dependent adhesion pathway.\",\n      \"evidence\": \"Glycosidase digestion and flow-based adhesion assays with anti-VAP-1 blocking antibodies on endothelial cells\",\n      \"pmids\": [\"8627168\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the lymphocyte counterreceptor for VAP-1 was unknown\", \"Whether enzymatic activity was required for adhesion was untested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrating that VAP-1 mediates subtype-specific leukocyte rolling under shear in vivo established it as a physiologically relevant adhesion molecule distinct from L-selectin, PSGL-1, and α4-integrin pathways.\",\n      \"evidence\": \"Intravital microscopy with multiple blocking antibodies in peripheral lymph nodes and flow-based assays\",\n      \"pmids\": [\"9254657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of lymphocyte subset selectivity not defined\", \"Downstream signaling on engagement not characterized\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Discovery of a circulating soluble form (sVAP-1) raised the question of whether AOC3 functions extend beyond cell-surface adhesion to systemic immunomodulation.\",\n      \"evidence\": \"Sandwich ELISA, immunoblotting, and lymphocyte adhesion assay on plasma-derived sVAP-1\",\n      \"pmids\": [\"9686623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of shedding was unknown\", \"Physiological relevance of soluble form in vivo not established\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Reconstitution of VAP-1-dependent adhesion in a transfected endothelial cell line, combined with mutagenesis showing dispensability of the RGD motif and enzymatic activity individually, and identification of CD44 as a counterreceptor activation pathway, began to dissect the structural requirements for adhesion.\",\n      \"evidence\": \"cDNA transfection, site-directed mutagenesis, rotatory and flow-chamber adhesion assays, antibody blocking\",\n      \"pmids\": [\"10864915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct lymphocyte ligand for VAP-1 still unidentified\", \"Relative contribution of enzymatic vs. structural adhesion not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"In vivo intravital imaging showed VAP-1 acts as a molecular brake during granulocyte rolling and is required for ~70% of extravasation, quantifying its contribution to the multi-step adhesion cascade.\",\n      \"evidence\": \"Intravital microscopy with anti-VAP-1 antibody blockade in rabbit peritoneal inflammation model\",\n      \"pmids\": [\"11156953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the antibody blocks enzymatic activity, adhesion, or both was unclear\", \"Species generalizability not confirmed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Definitive proof that the TPQ-dependent oxidase activity is required for leukocyte transmigration resolved the long-standing question of whether AOC3 functions purely as an adhesion scaffold or requires catalysis; an enzymatically inactive point mutant abolished transmigration.\",\n      \"evidence\": \"Enzymatically inactive VAP-1 point mutant, specific amine oxidase inhibitors, flow-based in vitro assays and in vivo inflammation model\",\n      \"pmids\": [\"14726375\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of endogenous substrate(s) driving transmigration unknown\", \"Reactive products mediating downstream signaling not characterized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of metalloprotease-dependent shedding as the mechanism generating soluble VAP-1 from adipocytes explained the origin of circulating sVAP-1 and linked it to TNFα-driven inflammation.\",\n      \"evidence\": \"Metalloprotease inhibitor (batimastat) blockade of sVAP-1 release from 3T3-L1 and human adipocyte explants stimulated with TNFα\",\n      \"pmids\": [\"14968297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific metalloprotease identity not determined\", \"Whether endothelial shedding follows the same mechanism was untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"AOC3 knockout mice established the gene as genetically required for slow rolling, firm adhesion, transmigration, and lymphocyte homing in vivo, providing the definitive loss-of-function genetic evidence for its role in the leukocyte extravasation cascade.\",\n      \"evidence\": \"AOC3 KO mice with intravital imaging, peritonitis model, and lymphocyte homing assays\",\n      \"pmids\": [\"15664163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Could not distinguish whether loss of adhesion vs. loss of enzymatic activity caused the phenotype\", \"Compensatory mechanisms in chronic KO not assessed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that VAP-1 oxidase activity induces E- and P-selectin transcription/translation on endothelial cells identified a feed-forward mechanism whereby amine oxidation products amplify the leukocyte adhesion cascade beyond VAP-1's own adhesive function.\",\n      \"evidence\": \"WT vs. enzymatically inactive VAP-1 transfectants and VAP-1-deficient mice carrying human VAP-1 transgene with gene/protein expression assays\",\n      \"pmids\": [\"17548577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific oxidation product(s) responsible for selectin induction not identified\", \"Signaling pathway from oxidation products to selectin gene transcription not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Two key advances established AOC3's metabolic and immune tissue roles: AOC3 KO adipocytes lost benzylamine/methylamine-stimulated glucose transport while retaining insulin responses, proving the SSAO activity drives insulin-mimetic metabolic effects; separately, AOC3 KO mice showed defective mucosal immunity with reduced Peyer's patch lymphocytes and impaired antimicrobial responses.\",\n      \"evidence\": \"AOC3 KO adipocyte hexose transport assays; AOC3 KO mice with immunization, microbial challenge, flow cytometry\",\n      \"pmids\": [\"17406965\", \"17947691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous amine substrates driving glucose transport in vivo unidentified\", \"Whether mucosal immune defect is purely homing-dependent or involves local signaling unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Crystal structures of AOC3 revealed the TPQ cofactor in on-copper and off-copper conformations with imidazole, and mutagenesis of active-site residues (Met211, Leu469) defined determinants of substrate specificity; concurrent kinetic isotope effect studies established C–H bond breakage as rate-limiting for TPQ reduction, providing a detailed enzymological framework.\",\n      \"evidence\": \"X-ray crystallography at 2.6–2.95 Å, site-directed mutagenesis, steady-state kinetics with KIE and pH-dependence analysis\",\n      \"pmids\": [\"21585208\", \"21737458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of AOC3 with a physiological substrate bound\", \"Mechanism of substrate channeling in the homodimer not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Localization of AOC3 to lipid rafts specifically in endothelial cells (not smooth muscle cells) explained cell-type-specific leukocyte adhesion function, separating the adhesion role from the broader tissue expression pattern.\",\n      \"evidence\": \"Lipid raft fractionation and leukocyte adhesion assays comparing stably transfected endothelial vs. smooth muscle cells\",\n      \"pmids\": [\"21819380\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Lipid raft targeting signal within AOC3 not mapped\", \"Whether raft localization is required for enzymatic activity not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Systematic substrate profiling of purified human AOC3 defined its catalytic efficiency across primary amines and showed Km(O2) approximates interstitial oxygen tension, suggesting the enzyme is tuned to physiological oxygen availability.\",\n      \"evidence\": \"Recombinant enzyme from insect cells, in vitro kinetics with multiple substrates, whole-cell kinetics on 3T3-L1 adipocytes\",\n      \"pmids\": [\"22238597\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo substrate concentrations and identity of primary endogenous substrate(s) remain uncertain\", \"Oxygen-sensing implications not tested in intact organisms\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Oxidase-null knock-in mice phenocopied full AOC3 knockouts in peritonitis and arthritis, definitively separating the catalytic function from any structural/adhesion role and establishing that the enzymatic activity alone accounts for the pro-inflammatory phenotype.\",\n      \"evidence\": \"Oxidase-null knock-in mouse compared to KO in sterile peritonitis and antibody-induced arthritis models\",\n      \"pmids\": [\"23885334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether adhesion-only function exists in other inflammatory contexts not excluded\", \"Nature of endogenous substrates at inflamed sites not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Crystal structures of AOC3 with pyridazinone inhibitors revealed a reversible binding site in the active-site channel and identified species-specific residues affecting inhibitor affinity, advancing structure-based drug design.\",\n      \"evidence\": \"X-ray crystallography of inhibitor–VAP-1 complexes, enzyme inhibition assays, homology modeling for species comparison\",\n      \"pmids\": [\"24304424\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo efficacy of pyridazinone-class inhibitors not reported\", \"Selectivity over other copper amine oxidases not fully characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Parallel comparison of AOC3 KO and oxidase-null knock-in mice established that loss of catalytic activity causes increased adiposity and loss of benzylamine-stimulated glucose transport, with downregulated adipose inflammatory markers — unifying the metabolic and anti-inflammatory consequences of AOC3 enzymatic function.\",\n      \"evidence\": \"Body composition analysis, adipocyte glucose transport assay, inflammatory marker expression in KO vs. oxidase-null knock-in mice\",\n      \"pmids\": [\"32712883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking amine oxidation to glucose transporter translocation not resolved\", \"Whether increased adiposity reflects developmental compensation or acute metabolic role unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of the MRTF–SRF pathway as a transcriptional regulator of AOC3 in smooth muscle cells, with KDM3A-dependent chromatin remodeling, provided the first defined transcriptional control mechanism for AOC3 expression.\",\n      \"evidence\": \"MRTF overexpression, SRF siRNA knockdown, promoter reporter assay, ChIP for SRF binding in human SMCs\",\n      \"pmids\": [\"33727640\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether MRTF–SRF controls AOC3 in endothelial cells or adipocytes not tested\", \"Upstream signals regulating MRTF activity toward AOC3 not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A non-canonical role for AOC3 was identified in GIST cells where its loss stabilizes HK2 by reducing ubiquitin-mediated degradation, enhancing glycolysis and H3K18 lactylation at the Myc promoter to drive Myc-dependent imatinib resistance.\",\n      \"evidence\": \"AOC3 knockdown in GIST cell lines, HK2 ubiquitination assay, ChIP for H3K18la, HK2 overexpression rescue, xenograft model\",\n      \"pmids\": [\"41570175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AOC3 enzymatic activity or protein scaffolding drives HK2 destabilization not resolved\", \"Not independently replicated; relevance to non-GIST cancers unknown\", \"Mechanism of AOC3-dependent HK2 ubiquitination (E3 ligase identity) not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the endogenous leukocyte counterreceptor for AOC3 and the specific endogenous amine substrates oxidized at sites of inflammation to drive the extravasation cascade remain unresolved; the mechanism linking amine oxidation products to glucose transporter translocation in adipocytes is also undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Leukocyte counterreceptor identity unknown\", \"Endogenous substrate(s) at inflammatory sites not identified\", \"Signaling from oxidation products to GLUT4 translocation not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [5, 13, 16, 17, 18]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 15, 17]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 4, 5, 7, 8, 10, 18]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [17, 23, 24, 26]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 3, 7, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SRF\",\n      \"MKL1\",\n      \"KDM3A\",\n      \"NKX2-3\",\n      \"HK2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}