{"gene":"VAMP3","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2000,"finding":"VAMP3-containing vesicles, likely derived from recycling endosomes, focally accumulate at sites of nascent phagosome formation, and polarized fusion of VAMP3 vesicles with the plasma membrane precedes phagosome sealing, indicating VAMP3 mediates targeted endomembrane delivery to elongate pseudopods during phagocytosis.","method":"GFP-tagging as fluorescent indicator and exofacial epitope; live fluorescence microscopy; focal exocytosis assay in macrophages","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-imaging localization with functional consequence (pseudopod extension), single lab, two orthogonal methods (GFP fusion + epitope tagging)","pmids":["10791982"],"is_preprint":false},{"year":1997,"finding":"VAMP3/cellubrevin functions as a vesicle SNARE (v-SNARE) pairing with the t-SNARE syntaxin 4 to mediate insulin-stimulated GLUT4 vesicle translocation to the plasma membrane in adipocytes; expression of the cytoplasmic domain of VAMP3 inhibited insulin-stimulated GLUT4 translocation, and syntaxin 4 co-immunoprecipitated GLUT4-containing vesicles in an insulin-dependent manner.","method":"Dominant-negative cytoplasmic domain expression via recombinant vaccinia virus or microinjection; co-immunoprecipitation of GLUT4 vesicles with syntaxin 4 cytoplasmic domain","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal functional inhibition plus co-IP, single lab, two orthogonal methods","pmids":["9111311"],"is_preprint":false},{"year":2000,"finding":"VAMP2, but not VAMP3/cellubrevin, is required for insulin-stimulated GLUT4 translocation in L6 myoblasts; only tetanus-toxin-resistant VAMP2 (not VAMP3) rescued inhibition of insulin-dependent GLUT4 translocation, and insulin-induced cortical actin reorganization clustered GLUT4 with VAMP2 but not VAMP3.","method":"Tetanus toxin light chain transfection to cleave VAMP2/VAMP3; rescue with toxin-resistant SNARE constructs; single-cell fluorescence GLUT4 translocation assay; actin/SNARE co-localization imaging","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution-level rescue experiment with toxin-resistant VAMP2 (not VAMP3), multiple orthogonal methods in single study, clear negative result for VAMP3","pmids":["10888677"],"is_preprint":false},{"year":2001,"finding":"VAMP3 null mice display normal insulin-stimulated and exercise-regulated GLUT4 translocation, normal glucose tolerance, and normal general membrane trafficking (phagocytosis, pinocytosis, transferrin receptor recycling), demonstrating VAMP3 is not essential for these processes in vivo.","method":"Targeted gene disruption (VAMP3 knockout mice); glucose uptake assays in primary adipocytes and skeletal muscle; phagocytosis, pinocytosis, and transferrin recycling assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — genetic knockout with multiple orthogonal functional assays; negative result reported with high rigor","pmids":["11238894"],"is_preprint":false},{"year":2002,"finding":"VAMP3 and VAMP8 are the VAMP isoforms present in human platelets and form SNARE complexes with syntaxin 4; recombinant VAMP3 (but not VAMP2) blocked alpha-granule secretion and nearly completely inhibited dense-granule secretion in permeabilized platelets, demonstrating VAMP3 is required for platelet granule secretion.","method":"Mass spectrometry co-immunoprecipitation (nano-LC-MS/MS) from platelets with syntaxin 4; recombinant VAMP competition assay in streptolysin O-permeabilized platelets; flow cytometry (P-selectin) and radiolabel serotonin release","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro reconstitution-type competition assay with recombinant proteins, MS-based identification, multiple orthogonal granule secretion readouts","pmids":["12130530"],"is_preprint":false},{"year":2002,"finding":"VAMP3-null macrophages show transiently slower uptake of zymosan (but not IgG-beads, complement-opsonized particles, or latex microspheres) at early time points (5–15 min), indicating VAMP3 modulates efficient zymosan uptake but is not absolutely required for phagocytosis.","method":"VAMP3 knockout mouse-derived bone marrow macrophages; phagocytosis assays with multiple particles; phagosome maturation assay (LAMP-1 acquisition)","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with multiple particle types and time points, single lab","pmids":["12101283"],"is_preprint":false},{"year":2007,"finding":"VAMP3 forms fusogenic SNARE complexes with syntaxin1/SNAP-25, syntaxin1/SNAP-23, and syntaxin4/SNAP-25, but not with syntaxin4/SNAP-23; deletion of the N-terminal domain of syntaxin4 enhanced membrane fusion more than two-fold, indicating this domain negatively regulates fusion.","method":"Cell fusion assay using full-length SNARE proteins expressed in cells; deletion mutagenesis of syntaxin4 N-terminal domain","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — functional fusion assay with mutagenesis, single lab, no structural validation","pmids":["17651732"],"is_preprint":false},{"year":2009,"finding":"VAMP3 (v-SNARE) is required for fusion of multivesicular bodies (MVBs) with autophagosomes to generate amphisomes in K562 cells; knockdown of VAMP3 blocked this MVB-autophagosome fusion step but did not affect subsequent fusion with lysosomes, which instead requires VAMP7.","method":"siRNA knockdown; morphological, molecular, and biochemical analyses of autophagosome/MVB fusion in K562 cells","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with specific functional readout (amphisome formation), pathway-position epistasis established, single lab","pmids":["19781582"],"is_preprint":false},{"year":2009,"finding":"VAMP3 co-localizes with MMP2, MMP9, and MT1-MMP in HT-1080 fibrosarcoma cells; dominant-negative VAMP3 mutants, RNAi, and tetanus toxin cleavage of VAMP3 impaired secretion of MMP2/MMP9, trafficking of MT1-MMP to the cell surface, gelatin degradation, and cell invasion.","method":"Dominant-negative SNARE expression; siRNA/RNAi; tetanus toxin; co-localization by immunofluorescence; gelatin degradation assay; Boyden chamber invasion assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — three independent inhibitory approaches (DN, RNAi, toxin) plus multiple functional readouts (secretion, trafficking, degradation, invasion)","pmids":["19910495"],"is_preprint":false},{"year":2009,"finding":"VAMP3 silencing reduces beta1-integrin levels at the cell surface (without affecting total integrin) and inhibits chemotactic cell migration by >60%, establishing VAMP3 as required for trafficking of beta1-integrin to the plasma membrane and for cell migration.","method":"siRNA knockdown; flow cytometry (surface beta1-integrin); chemotaxis migration assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with surface vs. total integrin quantification, single lab, two orthogonal readouts","pmids":["19159614"],"is_preprint":false},{"year":2010,"finding":"VAMP3 (but not VAMP8) is present on Weibel-Palade bodies (WPBs) and forms a stable SNARE complex with syntaxin 4 and SNAP23 in endothelial cells; soluble VAMP3 cytoplasmic domain mutants (but not VAMP8 mutants) interfere with Ca2+-triggered vWF secretion from permeabilized endothelial cells.","method":"Immunofluorescence co-localization; co-immunoprecipitation; permeabilized endothelial cell secretion assay with dominant-negative SNARE mutants; immunoblotting","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution-type permeabilized cell assay with DN mutants, reciprocal Co-IP, mechanistic selectivity demonstrated (VAMP3 vs VAMP8)","pmids":["21094665"],"is_preprint":false},{"year":2011,"finding":"VAMP3 mediates fusion of recycling-endosome-derived vesicles carrying PLP with the oligodendroglial plasma membrane; Syntaxin-4 was identified as the prime acceptor Q-SNARE for VAMP3 in this context. Interference with VAMP3 by siRNA or dominant-negative expression diminished PLP transport to the cell surface.","method":"siRNA knockdown; dominant-negative VAMP3 expression; co-localization; VAMP3-deficient mice; mocha mutant mice analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple inhibitory approaches plus in vivo mouse model, single lab","pmids":["21490207"],"is_preprint":false},{"year":2011,"finding":"The VAMP3/Stx4/SNAP23 SNARE complex regulates macrophage adhesion, spreading, and persistent migration on fibronectin by mediating polarized exocytosis of VAMP3-positive recycling endosome membrane; reduction of VAMP3 disrupted podosome superstructure organization and polarized podosome localization during migration.","method":"shRNA knockdown and overexpression; live-cell and fixed immunofluorescence; cell spreading and migration assays on fibronectin","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD plus OE with specific cellular phenotype readouts, SNARE complex placement, single lab","pmids":["21586284"],"is_preprint":false},{"year":2012,"finding":"VAMP3 and syntaxin 6 (STX6) form a v-/t-SNARE complex; endocytosed alpha3beta1-integrin traffics through VAMP3-containing recycling endosomes before delivery via STX6-containing trans-Golgi network compartments to the plasma membrane. VAMP3 is required for alpha3beta1-integrin delivery to the cell surface.","method":"Co-immunoprecipitation of VAMP3-STX6 complex; siRNA knockdown; immunofluorescence co-localization; integrin surface delivery assay; chemotaxis migration assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus KD with functional integrin-trafficking readout, single lab","pmids":["22573826"],"is_preprint":false},{"year":2013,"finding":"VAMP3 is a direct ubiquitylation target of goliath-family E3 ubiquitin ligases (Drosophila Goliath/Godzilla, human RNF167); ubiquitylation of VAMP3 by Godzilla/RNF167 abrogates normal recycling endosome trafficking, and mutation of Godzilla ubiquitylation target lysines on VAMP3 blocks formation of enlarged Rab5-positive endosomes.","method":"Ubiquitylation assays; site-directed mutagenesis of VAMP3 lysines; overexpression and loss-of-function in Drosophila and mammalian cells; endosome morphology analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of ubiquitylation sites with functional rescue, cross-species validation (Drosophila + human RNF167), multiple orthogonal methods","pmids":["23353890"],"is_preprint":false},{"year":2013,"finding":"VAMP3 and SNAP23 mediate Ca2+-dependent secretion of IL-6 and TNFα from synovial sarcoma cells; a VAMP3 antibody co-precipitated SNAP23 and syntaxin-2 (and syntaxin-3 to a lesser extent), and SNAP23/VAMP3 form SDS-resistant complexes that are disrupted upon SNAP23 knockdown.","method":"siRNA knockdown; ELISA cytokine secretion assay; co-immunoprecipitation; SDS-resistant SNARE complex assay","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus KD with cytokine secretion readout, single lab","pmids":["24373201"],"is_preprint":false},{"year":2014,"finding":"Phosphatidylinositol 4-kinase IIα (PI4K2A) physically interacts with VAMP3 on tubulo-vesicular endosomes; PI4K2A knockdown inhibits VAMP3 trafficking to perinuclear membranes, impairs VAMP3-mediated transferrin receptor recycling, and decreases VAMP3 association with its cognate Q-SNARE Vti1a. Acute depletion of PtdIns4P on endosomes significantly delays VAMP3 trafficking.","method":"Co-immunoprecipitation; MS interactome; siRNA knockdown; transferrin receptor recycling assay; co-localization; acute PtdIns4P depletion","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, MS-identified binding partner, multiple KD phenotypes and acute lipid depletion experiments, mechanistic link to SNARE pairing established","pmids":["25002402"],"is_preprint":false},{"year":2014,"finding":"VAMP3 is required for efficient entry of Uukuniemi virus (bunyavirus) into cells; viruses enter VAMP3-positive endosomal vesicles within 5 min of internalization; in VAMP3-depleted cells, viruses are trapped in LAMP1-negative compartments. Tetanus toxin cleavage of VAMP3 blocks infection.","method":"Genome-wide siRNA screens (two independent libraries); siRNA-mediated VAMP3 depletion; tetanus toxin inactivation; fluorescence live and fixed-cell imaging; LAMP1 co-localization","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide screen hit validated by two independent siRNA libraries, tetanus toxin, and live imaging with specific compartment readout","pmids":["24850728"],"is_preprint":false},{"year":2015,"finding":"Rab8 is required for VAMP3 clustering at the immune synapse in T cells; in dominant-negative Rab8 T cells, TCR-positive endosomes polarized normally to the synapse but could not dock/fuse because VAMP3 failed to cluster there. VAMP3 also interacts with Rab8 at the base of the cilium in NIH-3T3 cells.","method":"Dominant-negative Rab8 expression; immunofluorescence co-localization; TCR recycling assay at the immune synapse; co-localization of VAMP3 with Rab8 in cilia","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DN Rab8 with specific mechanistic consequence (VAMP3 clustering failure), cross-cell-type validation, single lab","pmids":["26034069"],"is_preprint":false},{"year":2015,"finding":"VAMP3 vesicles in cortical astrocytes undergo Ca2+-independent exo-endocytotic cycling at the plasma membrane and regulate the recycling/surface expression of plasma membrane glutamate transporters; cAMP modulates VAMP3 vesicle cycling and glutamate uptake. Astrocytes express VAMP3 but not VAMP2.","method":"VAMP2 and VAMP3 knockout mice; STED and TIRF microscopy; single-vesicle imaging; glutamate uptake assay; optogenetics and pharmacology to modulate cAMP","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic KO combined with super-resolution live imaging and functional transporter assay, multiple orthogonal methods","pmids":["25864578"],"is_preprint":false},{"year":2015,"finding":"VAMP2, VAMP3, and VAMP8 are internalized via clathrin-independent endocytosis stimulated by Shiga toxin; Shiga toxin increases VAMP3 uptake even when clathrin-dependent endocytosis is blocked, and toxin trafficking/intoxication relies on these SNAREs.","method":"Fluorescence imaging of VAMP internalization; clathrin inhibition; Shiga toxin trafficking assays; intoxication assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple inhibitory conditions, functional intoxication readout, single lab","pmids":["26071526"],"is_preprint":false},{"year":2016,"finding":"VAMP3 interacts with NKCC2 co-transporter and co-localizes at the TAL apical surface; in vivo silencing of VAMP3 blocks constitutive (but not cAMP-stimulated) NKCC2 exocytic delivery to the apical membrane. VAMP3 knockout mice show decreased NKCC2 expression, increased urinary electrolyte/water excretion, and lower blood pressure.","method":"Co-immunoprecipitation (VAMP3-NKCC2); in vivo siRNA silencing in rat TAL; surface biotinylation; exocytic delivery assay; VAMP3 knockout mice; blood pressure measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo gene silencing plus KO mouse, Co-IP, surface biotinylation, physiological readouts, multiple orthogonal approaches","pmids":["27551042"],"is_preprint":false},{"year":2016,"finding":"The STX6-VTI1B-VAMP3 SNARE complex forms on recycling endosomes and is required for fusion between recycling endosomes (REs) and GAS-containing autophagosome-like vacuoles (GcAVs) during xenophagy; STX6 localizes to GcAVs via tyrosine-based sorting motif and H2 SNARE domain; RABGEF1 mediates the RE-GcAV fusion through this complex.","method":"Co-immunoprecipitation of SNARE complex; siRNA knockdown and CRISPR knockout of STX6, VAMP3, VTI1B; GAS xenophagy assay; co-localization by immunofluorescence","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP demonstrating ternary complex, CRISPR KO plus RNAi with specific functional readout (GAS clearance), multiple proteins validated, single lab","pmids":["27791468"],"is_preprint":false},{"year":2017,"finding":"VAMP3 and SNAP23 mediate disturbed-flow (oscillatory shear)-induced endothelial secretion of miR-126-3p and other microRNAs into non-membrane-bound extracellular form; knockdown of VAMP3/SNAP23 reduces endothelial miRNA secretion and SMC proliferation/migration. mTORC1 inhibition blocks this secretion via transcriptional suppression of VAMP3 and SNAP23.","method":"siRNA knockdown; shear stress in vitro system; qPCR/miRNA quantification; SMC co-culture proliferation/migration assays; in vivo rapamycin treatment; carotid artery ligation model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro KD plus in vivo mouse model, pharmacological inhibition, multiple functional readouts including neointima formation","pmids":["28716920"],"is_preprint":false},{"year":2017,"finding":"VAMP3/Syb (Drosophila ortholog) and YKT6 are required for constitutive secretory carrier fusion with the plasma membrane; combinatorial RNAi depletion in Drosophila cells identified SNARE complexes including STX1/SNAP24/29/Syb; RNAi depletion of YKT6 and VAMP3 in mammalian cells also blocked constitutive secretion.","method":"Quantitative secretion assay; combinatorial RNAi depletion in Drosophila S2 cells and mammalian cells","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combinatorial RNAi with quantitative secretion assay, cross-species validation, single lab","pmids":["28403141"],"is_preprint":false},{"year":2019,"finding":"WDFY2 physically interacts with VAMP3 on endosomal tubules enriched in PtdIns3P; WDFY2 knockout causes redistribution of VAMP3 into small vesicles near the plasma membrane, leading to increased VAMP3-dependent secretion of MT1-MMP, enhanced ECM degradation, and increased cell invasion.","method":"Co-immunoprecipitation (WDFY2-VAMP3 interaction); CRISPR knockout of WDFY2; immunofluorescence redistribution of VAMP3; MT1-MMP secretion assay; ECM degradation assay; invasion assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO plus Co-IP binding partner identification, multiple downstream functional readouts, mechanistic model with VAMP3 as effector","pmids":["31253801"],"is_preprint":false},{"year":2020,"finding":"bFGF signaling increases VAMP3 abundance on neuronal extracellular vesicles and enhances MVB-plasma membrane fusion in hippocampal neurons; VAMP3 knockdown attenuates bFGF-induced EV release, establishing VAMP3 as mediating bFGF-regulated neuronal exosome secretion.","method":"Patch-clamp electrophysiology with pH-sensitive dye imaging of MVB-PM fusion; proteomics of neuronal EVs; siRNA knockdown; nanoparticle tracking","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — real-time single-neuron fusion imaging plus proteomics plus KD, multiple orthogonal methods, single lab","pmids":["32195080"],"is_preprint":false},{"year":2020,"finding":"VAMP3 and SNAP23 mediate oscillatory shear-induced endothelial VWF secretion; oscillatory shear promotes translocation of VAMP3 and SNAP23 to the plasma membrane; knockdown of VAMP3/SNAP23 reduces VWF secretion and platelet aggregation, and systemic VAMP3/SNAP23 inhibition ameliorates FeCl3-induced thrombogenesis in mice.","method":"siRNA knockdown; intracellular localization by immunofluorescence; VWF ELISA; platelet aggregation assay; in vivo carotid artery thrombosis model (FeCl3); intraluminal overexpression","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro KD plus in vivo mouse model, multiple functional readouts, single lab","pmids":["33224946"],"is_preprint":false},{"year":2020,"finding":"Hrd1 E3 ubiquitin ligase ubiquitylates VAMP3, and H2S promotes Hrd1 S-sulfhydration at Cys115, which enhances VAMP3 ubiquitylation and prevents CD36 translocation to the plasma membrane; Hrd1 Cys115 mutation abolished VAMP3 ubiquitylation and increased CD36/VAMP3 plasma membrane expression and lipid droplet formation.","method":"S-sulfhydration assay; immunoprecipitation for ubiquitylation; LC-MS/MS; site-directed mutagenesis (Hrd1 Cys115); siRNA knockdown; Western blot; lipid droplet staining","journal":"Aging and disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus ubiquitylation IP plus MS identification, single lab","pmids":["32257542"],"is_preprint":false},{"year":2021,"finding":"VAMP3 in astrocytes selectively mediates the exocytosis of endocytosed BDNF; endocytic QD-BDNF particles are enriched in Vamp3-positive vesicles, and Vamp3 downregulation disrupts BDNF secretion without affecting BDNF uptake or intracellular transport.","method":"Quantum dot-conjugated BDNF (QD-BDNF) live tracking in cultured astrocytes; siRNA knockdown of Vamp3; confocal imaging of ATP-evoked exocytosis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single-vesicle live imaging with KD, specific uptake vs. secretion dissection, single lab","pmids":["34707216"],"is_preprint":false},{"year":2021,"finding":"Five chlamydial inclusion membrane proteins (Incs) transiently and temporally interact with VAMP3 during Chlamydia trachomatis infection; loss of incA or ct813 expression altered VAMP3 localization to the inclusion. VAMP3 (and VAMP4) are recruited to the chlamydial inclusion during mid-developmental cycle requiring de novo chlamydial protein synthesis.","method":"Inducible FLAG-Inc expression in C. trachomatis transformants; co-immunoprecipitation; immunofluorescence localization in infected cells; two complementary experimental systems","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two complementary experimental systems, co-IP in infected cells, genetic loss-of-function for specific Incs, single lab","pmids":["33229367"],"is_preprint":false},{"year":2022,"finding":"VAMP3 in mast cells (RBL-2H3) mediates secretory granule fusion and degranulation upon FcεRI activation; VAMP3 knockdown decreases degranulation, impairs CD63-marked granule enlargement (homotypic fusion), and reduces FcεRI surface expression by disrupting plasma membrane homeostasis. VAMP3 KD also dysregulates endocytosis and lipid raft formation.","method":"shRNA-mediated VAMP3 knockdown; degranulation assay; CD63-GFP fluorescence granule imaging; flow cytometry (FcεRI surface expression); intracellular Ca2+ response; cytokine ELISA","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable shRNA KD with multiple orthogonal functional readouts, single lab","pmids":["35990647"],"is_preprint":false},{"year":2023,"finding":"Galectin-9 physically interacts with VAMP3 (identified by immunoprecipitation-mass spectrometry) in dendritic cells; galectin-9 depletion causes cytokine-containing vesicles to accumulate in the Golgi and undergo lysosomal degradation rather than being secreted, and galectin-9 is required for rerouting VAMP3-containing endosomes upon DC activation.","method":"Immunoprecipitation-mass spectrometry (galectin-9 interactome); siRNA knockdown; immunofluorescence (vesicle accumulation in Golgi); cytokine secretion assay","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based binding partner identification plus KD with vesicle trafficking phenotype, single lab","pmids":["37755527"],"is_preprint":false},{"year":2023,"finding":"Myeloid-specific VAMP3 knockout (LysM-Cre x Vamp3-flox) mice show significantly reduced TNF-α and IL-6 release from macrophages, decreased CFA-induced paw edema, and reduced mechanical allodynia and thermal hyperalgesia, demonstrating VAMP3 in macrophages mediates inflammatory cytokine secretion and contributes to inflammatory pain.","method":"Conditional myeloid-specific Vamp3 knockout mice; ELISA cytokine measurement; CFA inflammatory pain model; behavioral pain assays; RT-qPCR","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with multiple functional readouts (cytokine secretion, inflammation, pain behavior), rigorous genetic approach","pmids":["37965323"],"is_preprint":false},{"year":2025,"finding":"VAMP3 on transferrin receptor (TfR) vesicles interacts with the t-SNARE syntaxin 4 (restricted to the basolateral membrane of HBMECs) to mediate fusion of TfR transcytotic vesicles with the basolateral membrane; silencing VAMP3 reduces TfR transcytosis and NMEC brain penetration in vitro and in vivo; NMEC infection upregulates VAMP3 and syntaxin 4 via TLR4-TRAM-TRIF-TRAF3-IKK-IRF3 signaling to enhance transcytosis.","method":"Co-immunoprecipitation (VAMP3-syntaxin 4); siRNA knockdown and overexpression in BBB model; VAMP3 KO mice; transferrin transcytosis assay; NMEC brain penetration assay; signaling pathway inhibitors","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus KO mouse plus in vitro KD/OE with multiple functional readouts (transcytosis, bacterial penetration), pathway delineated, rigorous multi-approach study","pmids":["40601634"],"is_preprint":false},{"year":2025,"finding":"Phosphorylation of VAMP3 (upon LPS stimulation of dendritic cells) releases VAMP3 from the chaperone WDFY2, enabling IL-6-positive VAMP3-positive vesicles to traffic to and fuse with the plasma membrane via complex formation with STX4, mediating IL-6 secretion in a polarized manner.","method":"Quantitative TIRF microscopy; phosphoproteomic bioinformatic analysis; VAMP3 phospho-mutants; co-immunoprecipitation (VAMP3-WDFY2, VAMP3-STX4); IL-6 secretion assay; LPS stimulation of dendritic cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — phosphoproteomics-guided mechanism with phospho-mutant validation, multiple Co-IPs, quantitative single-vesicle TIRF imaging, functional secretion readout","pmids":["40977280"],"is_preprint":false},{"year":2025,"finding":"H. pylori reduces METTL14-mediated m6A modification of VAMP3 mRNA (via upregulation of ATF3 suppressing METTL14), decreasing VAMP3 expression and promoting c-Met recycling via VAMP3/LC3C pathway, thereby accelerating gastric cancer progression.","method":"m6A modification assay; METTL14 knockdown/overexpression; ATF3 modulation; co-immunoprecipitation; in vitro/in vivo cancer cell proliferation/metastasis assays","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic manipulations with m6A mechanistic readout and functional cancer phenotype, single lab","pmids":["39827141"],"is_preprint":false},{"year":2025,"finding":"Botulinum neurotoxin type DC (BoNT/DC) cleaves VAMP3 (and VAMP2) in melanocytes; VAMP3 knockdown (but not VAMP2 knockdown) reduces melanin content and arrests melanosome maturation at stage II (more early, fewer late-stage IV melanosomes), establishing VAMP3 as required for cargo (tyrosinase/PMEL) trafficking during melanogenesis.","method":"BoNT/DC cleavage of VAMPs; siRNA knockdown of VAMP3 and VAMP2; melanin content assay; electron microscopy of melanosome stages; multiple human melanocyte models","journal":"Toxicon","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent inhibition methods (toxin cleavage + siRNA KD), VAMP3 vs VAMP2 selectivity demonstrated, EM structural readout, single lab","pmids":["40286827"],"is_preprint":false}],"current_model":"VAMP3 (cellubrevin) is an R-SNARE (v-SNARE) resident on recycling endosomes that drives constitutive and regulated membrane fusion events across diverse cell types by forming ternary SNARE complexes with cognate t-SNAREs (principally syntaxin 4/SNAP23, syntaxin 4/SNAP25, and syntaxin 1/SNAP25, but not syntaxin 4/SNAP23 in vitro), mediating processes including recycling endosome-to-plasma-membrane delivery of integrins, GLUT4 vesicles (partially), NKCC2, MT1-MMP, and PLP; platelet and mast cell granule secretion; MVB-autophagosome fusion (amphisome formation); Weibel-Palade body and VWF exocytosis; MMP secretion and cell invasion; astrocyte glutamate transporter recycling and BDNF secretion; neuronal exosome release; and IL-6 secretion in dendritic cells upon LPS-induced phosphorylation that releases VAMP3 from its WDFY2 chaperone. Its trafficking is regulated by PI4K2A/PtdIns4P on endosomes, by ubiquitylation via Goliath/RNF167 E3 ligases, by Hrd1-mediated ubiquitylation downstream of H2S/S-sulfhydration, by m6A modification of its mRNA via METTL14, and by Rab8-dependent clustering; it interacts with Rab8, galectin-9, WDFY2, and multiple chlamydial Inc proteins."},"narrative":{"mechanistic_narrative":"VAMP3 (cellubrevin) is an R-SNARE (v-SNARE) resident on recycling endosomes that drives membrane fusion across diverse secretory and trafficking pathways by forming ternary SNARE complexes with cognate t-SNAREs [PMID:12130530, PMID:17651732, PMID:21094665]. In cell fusion assays VAMP3 partners productively with syntaxin1/SNAP-25, syntaxin1/SNAP-23, and syntaxin4/SNAP-25, but not syntaxin4/SNAP-23, and the N-terminal domain of syntaxin4 negatively regulates fusion [PMID:17651732]; in cellular contexts it assembles with syntaxin 4/SNAP23 on Weibel-Palade bodies, with STX6 and STX6/VTI1B on recycling endosomes, and with SNAP23/syntaxin-2 in cytokine-secreting cells [PMID:21094665, PMID:22573826, PMID:27791468, PMID:24373201]. Through these complexes VAMP3 mediates polarized exocytosis of recycling-endosome membrane to deliver cargo to the cell surface — β1- and α3β1-integrins, MT1-MMP and secreted MMP2/MMP9, the NKCC2 cotransporter, proteolipid protein, transferrin receptor, and transcytotic TfR vesicles across the blood-brain barrier — thereby supporting cell adhesion, migration, matrix degradation, invasion, and physiological electrolyte handling [PMID:19910495, PMID:19159614, PMID:22573826, PMID:27551042, PMID:21490207, PMID:40601634, PMID:21586284]. It also serves as the fusion SNARE for regulated secretion in multiple cell types, including platelet alpha- and dense-granule release, mast cell degranulation, endothelial VWF secretion, astrocyte glutamate-transporter recycling and BDNF exocytosis, neuronal exosome release, and inflammatory cytokine (IL-6, TNFα) secretion from macrophages and dendritic cells that contributes to inflammatory pain [PMID:12130530, PMID:35990647, PMID:33224946, PMID:25864578, PMID:34707216, PMID:32195080, PMID:37965323, PMID:40977280]. Within the autophagy/endosome system VAMP3 mediates MVB-autophagosome fusion (amphisome formation) and recycling-endosome fusion with bacteria-containing autophagic vacuoles during xenophagy [PMID:19781582, PMID:27791468]. VAMP3 activity is positioned and tuned by upstream regulators: PI4K2A/PtdIns4P promotes its endosomal trafficking and Q-SNARE pairing [PMID:25002402], Rab8 drives its clustering at fusion sites [PMID:26034069], the chaperone WDFY2 sequesters it on endosomal tubules until phosphorylation releases it for polarized secretion [PMID:31253801, PMID:40977280], and Goliath/RNF167 and Hrd1 E3 ligases ubiquitylate it to control recycling and cargo surface delivery [PMID:23353890, PMID:32257542]. Genetic knockout established that VAMP3 is dispensable for insulin-stimulated GLUT4 translocation, transferrin recycling, and bulk phagocytosis in vivo, defining its roles as selective rather than housekeeping [PMID:11238894, PMID:10888677].","teleology":[{"year":1997,"claim":"Established the foundational hypothesis that VAMP3 acts as a v-SNARE pairing with syntaxin 4 to drive regulated vesicle delivery to the plasma membrane.","evidence":"Dominant-negative cytoplasmic domain expression and syntaxin 4 co-IP of GLUT4 vesicles in adipocytes","pmids":["9111311"],"confidence":"Medium","gaps":["Did not distinguish VAMP3 from other VAMP isoforms functionally","Inferential for GLUT4 specifically; later challenged"]},{"year":2000,"claim":"Resolved the GLUT4 question by showing VAMP2, not VAMP3, is the essential v-SNARE for insulin-stimulated GLUT4 translocation, refining VAMP3's substrate selectivity.","evidence":"Tetanus-toxin cleavage with toxin-resistant SNARE rescue and GLUT4 translocation imaging in L6 myoblasts","pmids":["10888677"],"confidence":"High","gaps":["Negative result for VAMP3 does not exclude partial/redundant roles","Cell-type specific (myoblasts)"]},{"year":2000,"claim":"Demonstrated VAMP3 delivers recycling-endosome membrane to nascent phagosomes, linking it to polarized focal exocytosis during membrane expansion.","evidence":"GFP/exofacial epitope tagging and live focal-exocytosis imaging in macrophages","pmids":["10791982"],"confidence":"Medium","gaps":["Correlative localization; SNARE partners at the phagosome not defined","Functional requirement not genetically tested here"]},{"year":2001,"claim":"Genetic knockout defined VAMP3 as non-essential for bulk housekeeping trafficking, forcing the field toward specialized, redundancy-buffered roles.","evidence":"VAMP3-null mice with GLUT4, phagocytosis, pinocytosis, and transferrin recycling assays","pmids":["11238894"],"confidence":"High","gaps":["Compensation by other VAMPs not excluded","Specialized secretory pathways not assayed"]},{"year":2002,"claim":"Identified VAMP3 as a required v-SNARE for regulated granule secretion, expanding its role beyond constitutive recycling into regulated exocytosis.","evidence":"Recombinant VAMP competition in permeabilized platelets, MS co-IP with syntaxin 4, and granule-release readouts","pmids":["12130530","12101283"],"confidence":"High","gaps":["VAMP3 vs VAMP8 redundancy in platelets partially overlapping","Phagocytosis effect modest and particle-selective"]},{"year":2007,"claim":"Defined VAMP3's permissive and forbidden SNARE pairings biochemically, establishing the combinatorial rules for its fusion activity.","evidence":"Cell fusion assay with full-length SNAREs and syntaxin4 N-terminal deletion mutagenesis","pmids":["17651732"],"confidence":"Medium","gaps":["No reconstituted liposome fusion or structural validation","syntaxin4/SNAP-23 result conflicts with in-cell complexes reported elsewhere"]},{"year":2009,"claim":"Placed VAMP3 at a specific autophagy step (MVB-autophagosome/amphisome fusion) distinct from the VAMP7-dependent lysosomal step, mapping its pathway position.","evidence":"siRNA knockdown with morphological and biochemical fusion analysis in K562 cells","pmids":["19781582"],"confidence":"Medium","gaps":["t-SNARE partners at MVB-autophagosome interface not defined here","Single cell line"]},{"year":2009,"claim":"Connected VAMP3 to invasive cell behavior by showing it traffics MMPs and integrins to the surface to enable matrix degradation and migration.","evidence":"DN, RNAi, and tetanus toxin inhibition with secretion, surface-integrin, gelatin degradation, and invasion assays in fibrosarcoma cells","pmids":["19910495","19159614"],"confidence":"High","gaps":["Direct SNARE partner for MMP/integrin carriers not fully resolved","In vivo tumor relevance not tested"]},{"year":2011,"claim":"Generalized VAMP3's recycling-endosome-to-surface delivery role across cell types (oligodendrocyte PLP, macrophage podosome dynamics), identifying syntaxin 4 as the prime acceptor Q-SNARE.","evidence":"siRNA/DN, VAMP3-deficient and mocha mutant mice, and migration/spreading assays","pmids":["21490207","21586284"],"confidence":"Medium","gaps":["Quantitative contribution vs other delivery routes unclear","syntaxin4 assignment context-dependent"]},{"year":2012,"claim":"Identified VAMP3-STX6 as an endosomal SNARE pairing routing integrin through recycling endosomes and the TGN to the surface, refining the trafficking itinerary.","evidence":"Reciprocal Co-IP, siRNA, surface-delivery and chemotaxis assays","pmids":["22573826"],"confidence":"Medium","gaps":["Single lab; STX6 vs syntaxin4 usage not reconciled mechanistically"]},{"year":2013,"claim":"Revealed ubiquitylation as a post-translational control of VAMP3 trafficking, showing E3 ligases gate its recycling-endosome function.","evidence":"Goliath/Godzilla/RNF167 ubiquitylation assays with VAMP3 lysine mutagenesis and endosome morphology in fly and mammalian cells","pmids":["23353890"],"confidence":"High","gaps":["Deubiquitylase and physiological signals that trigger ubiquitylation not defined","Effect on SNARE complex assembly unresolved"]},{"year":2014,"claim":"Established a lipid- and kinase-dependent mechanism positioning VAMP3 on endosomes and licensing its Q-SNARE pairing.","evidence":"PI4K2A Co-IP/MS, siRNA, acute PtdIns4P depletion, and Vti1a association/transferrin recycling assays","pmids":["25002402"],"confidence":"High","gaps":["How PtdIns4P physically recruits/orients VAMP3 not structurally defined"]},{"year":2015,"claim":"Identified Rab8 as the spatial regulator that clusters VAMP3 at fusion sites (immune synapse, cilium base), separating vesicle polarization from docking/fusion competence.","evidence":"Dominant-negative Rab8, TCR recycling, and co-localization across T cells and NIH-3T3 cells","pmids":["26034069"],"confidence":"Medium","gaps":["Direct vs indirect Rab8-VAMP3 link not established","Effector bridging Rab8 to VAMP3 unknown"]},{"year":2015,"claim":"Extended VAMP3 to astrocyte physiology, showing Ca2+-independent cycling that controls surface glutamate transporters and endocytosed cargo recycling.","evidence":"VAMP2/VAMP3 KO mice, STED/TIRF single-vesicle imaging, and glutamate uptake assays","pmids":["25864578"],"confidence":"High","gaps":["cAMP-to-VAMP3 signaling link mechanistically incomplete"]},{"year":2016,"claim":"Demonstrated in vivo physiological output of VAMP3 by linking it to constitutive NKCC2 apical delivery and blood-pressure regulation, and defined a STX6-VTI1B-VAMP3 xenophagy complex.","evidence":"VAMP3-NKCC2 Co-IP, in vivo TAL silencing and KO mice with blood pressure; ternary SNARE Co-IP and CRISPR KO in GAS xenophagy","pmids":["27551042","27791468"],"confidence":"High","gaps":["Constitutive vs stimulated delivery branch point not molecularly resolved","RABGEF1-to-SNARE coupling detail limited"]},{"year":2017,"claim":"Broadened VAMP3's secretory repertoire to shear-induced endothelial microRNA secretion and to general constitutive secretion conserved with the Drosophila ortholog.","evidence":"siRNA with shear-stress and miRNA secretion assays plus mTORC1 inhibition; combinatorial RNAi secretion assays across species","pmids":["28716920","28403141"],"confidence":"High","gaps":["Mechanism of non-vesicular miRNA export via VAMP3 incomplete","YKT6/VAMP3 functional relationship not dissected"]},{"year":2019,"claim":"Identified WDFY2 as an endosomal chaperone that sequesters VAMP3 to restrain invasive secretion, establishing a brake on VAMP3-dependent MT1-MMP delivery.","evidence":"WDFY2-VAMP3 Co-IP, CRISPR KO, VAMP3 redistribution imaging, and MT1-MMP secretion/ECM degradation/invasion assays","pmids":["31253801"],"confidence":"High","gaps":["Trigger releasing VAMP3 from WDFY2 not defined here (later shown to be phosphorylation)"]},{"year":2020,"claim":"Linked VAMP3 to neuronal exosome release, endothelial VWF secretion/thrombosis, and Hrd1/H2S-controlled CD36 surface delivery, showing signal-dependent tuning of VAMP3 output.","evidence":"bFGF-driven MVB-PM fusion imaging and EV proteomics; shear-induced VWF secretion with in vivo thrombosis model; Hrd1 S-sulfhydration and VAMP3 ubiquitylation assays","pmids":["32195080","33224946","32257542"],"confidence":"Medium","gaps":["Direct SNARE partners for exosome/CD36 routes incompletely mapped","Hrd1-VAMP3 ubiquitylation site not pinpointed"]},{"year":2021,"claim":"Defined VAMP3 as the exocytic SNARE for astrocyte BDNF release and as a host target hijacked by chlamydial Inc proteins, illustrating selectivity and pathogen subversion.","evidence":"QD-BDNF live tracking with Vamp3 KD; inducible FLAG-Inc expression and Co-IP/localization in C. trachomatis infection","pmids":["34707216","33229367"],"confidence":"Medium","gaps":["BDNF-loading SNARE partners undefined","Functional consequence of Inc-VAMP3 interaction for infection unresolved"]},{"year":2022,"claim":"Showed VAMP3 supports mast cell degranulation and plasma-membrane homeostasis, including homotypic granule fusion and receptor surface expression.","evidence":"shRNA KD with degranulation, CD63-GFP granule imaging, FcεRI surface flow cytometry in RBL-2H3 cells","pmids":["35990647"],"confidence":"Medium","gaps":["Direct vs indirect effects on lipid rafts/endocytosis not separated","SNARE partners in mast cell granules not defined"]},{"year":2023,"claim":"Established in vivo that macrophage VAMP3 drives inflammatory cytokine secretion and contributes to inflammatory pain, and identified galectin-9 as a partner rerouting VAMP3 vesicles for secretion.","evidence":"Myeloid-specific Vamp3 KO with cytokine, edema, and pain assays; galectin-9 IP-MS, KD, and cytokine secretion in dendritic cells","pmids":["37965323","37755527"],"confidence":"High","gaps":["How galectin-9 mechanistically diverts vesicles from lysosomal degradation incomplete"]},{"year":2025,"claim":"Integrated VAMP3 regulation into a phosphorylation-gated, WDFY2-chaperoned secretion switch, defined its role in BBB transcytosis and bacterial brain penetration, and connected its mRNA m6A regulation to gastric cancer and melanosome maturation.","evidence":"Phosphoproteomics with VAMP3 phospho-mutants, WDFY2/STX4 Co-IP and TIRF IL-6 imaging; VAMP3-syntaxin4 Co-IP with KO mice and transcytosis/penetration assays; METTL14 m6A and ATF3 modulation in cancer; BoNT/DC cleavage and KD in melanocytes","pmids":["40977280","40601634","39827141","40286827"],"confidence":"High","gaps":["Specific kinase phosphorylating VAMP3 not identified","m6A reader linking modification to VAMP3 translation undefined"]},{"year":null,"claim":"How VAMP3's many context-specific SNARE partner choices and post-translational marks (ubiquitin, phosphorylation, m6A) are integrated to select among its diverse cargo and fusion destinations remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of VAMP3 ternary complexes across its partner repertoire","Kinase(s), DUBs, and m6A readers acting on VAMP3 unidentified","Rules governing cargo-specific SNARE pairing not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[4,6,10,22]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,13,16,22]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,13,16,25]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[10,12,21,34]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,26,35]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,8,10,13,21]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7,22]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,31,33,35]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[9,13,34]}],"complexes":["VAMP3/syntaxin4/SNAP23 SNARE complex","STX6-VTI1B-VAMP3 SNARE complex"],"partners":["STX4","SNAP23","STX6","VTI1B","WDFY2","PI4K2A","RAB8A","LGALS9"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15836","full_name":"Vesicle-associated membrane protein 3","aliases":["Cellubrevin","CEB","Synaptobrevin-3"],"length_aa":100,"mass_kda":11.3,"function":"SNARE involved in vesicular transport from the late endosomes to the trans-Golgi network","subcellular_location":"Early endosome membrane; Recycling endosome membrane; Synapse, synaptosome","url":"https://www.uniprot.org/uniprotkb/Q15836/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VAMP3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000049245","cell_line_id":"CID000085","localizations":[{"compartment":"membrane","grade":3},{"compartment":"vesicles","grade":3},{"compartment":"golgi","grade":1}],"interactors":[{"gene":"SNAP23","stoichiometry":10.0},{"gene":"STX12","stoichiometry":10.0},{"gene":"VAMP3;VAMP2","stoichiometry":10.0},{"gene":"TFRC","stoichiometry":4.0},{"gene":"SNAP29","stoichiometry":4.0},{"gene":"NSF","stoichiometry":4.0},{"gene":"VAMP8","stoichiometry":4.0},{"gene":"SCAMP1","stoichiometry":4.0},{"gene":"RAB1B","stoichiometry":4.0},{"gene":"ATP6V1G2-DDX39B;ATP6V1G2;ATP6V1G1","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000085","total_profiled":1310},"omim":[{"mim_id":"616665","title":"SYNAPTOPHYSIN-LIKE 1; SYPL1","url":"https://www.omim.org/entry/616665"},{"mim_id":"613332","title":"MEMBRANE-ASSOCIATED RING-CH FINGER PROTEIN 2; MARCHF2","url":"https://www.omim.org/entry/613332"},{"mim_id":"607763","title":"ARF-GAP WITH COILED-COIL, ANKYRIN REPEAT, AND PLECKSTRIN HOMOLOGY DOMAINS 1; ACAP1","url":"https://www.omim.org/entry/607763"},{"mim_id":"607029","title":"VESICLE-ASSOCIATED MEMBRANE PROTEIN 5; VAMP5","url":"https://www.omim.org/entry/607029"},{"mim_id":"604925","title":"RAB ACCEPTOR 1; RABAC1","url":"https://www.omim.org/entry/604925"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VAMP3"},"hgnc":{"alias_symbol":["CEB"],"prev_symbol":[]},"alphafold":{"accession":"Q15836","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15836","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15836-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15836-F1-predicted_aligned_error_v6.png","plddt_mean":90.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VAMP3","jax_strain_url":"https://www.jax.org/strain/search?query=VAMP3"},"sequence":{"accession":"Q15836","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15836.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15836/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15836"}},"corpus_meta":[{"pmid":"19781582","id":"PMC_19781582","title":"TI-VAMP/VAMP7 and VAMP3/cellubrevin: two v-SNARE proteins involved in specific steps of the autophagy/multivesicular body 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live fluorescence microscopy; focal exocytosis assay in macrophages\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-imaging localization with functional consequence (pseudopod extension), single lab, two orthogonal methods (GFP fusion + epitope tagging)\",\n      \"pmids\": [\"10791982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"VAMP3/cellubrevin functions as a vesicle SNARE (v-SNARE) pairing with the t-SNARE syntaxin 4 to mediate insulin-stimulated GLUT4 vesicle translocation to the plasma membrane in adipocytes; expression of the cytoplasmic domain of VAMP3 inhibited insulin-stimulated GLUT4 translocation, and syntaxin 4 co-immunoprecipitated GLUT4-containing vesicles in an insulin-dependent manner.\",\n      \"method\": \"Dominant-negative cytoplasmic domain expression via recombinant vaccinia virus or microinjection; co-immunoprecipitation of GLUT4 vesicles with syntaxin 4 cytoplasmic domain\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal functional inhibition plus co-IP, single lab, two orthogonal methods\",\n      \"pmids\": [\"9111311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"VAMP2, but not VAMP3/cellubrevin, is required for insulin-stimulated GLUT4 translocation in L6 myoblasts; only tetanus-toxin-resistant VAMP2 (not VAMP3) rescued inhibition of insulin-dependent GLUT4 translocation, and insulin-induced cortical actin reorganization clustered GLUT4 with VAMP2 but not VAMP3.\",\n      \"method\": \"Tetanus toxin light chain transfection to cleave VAMP2/VAMP3; rescue with toxin-resistant SNARE constructs; single-cell fluorescence GLUT4 translocation assay; actin/SNARE co-localization imaging\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution-level rescue experiment with toxin-resistant VAMP2 (not VAMP3), multiple orthogonal methods in single study, clear negative result for VAMP3\",\n      \"pmids\": [\"10888677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"VAMP3 null mice display normal insulin-stimulated and exercise-regulated GLUT4 translocation, normal glucose tolerance, and normal general membrane trafficking (phagocytosis, pinocytosis, transferrin receptor recycling), demonstrating VAMP3 is not essential for these processes in vivo.\",\n      \"method\": \"Targeted gene disruption (VAMP3 knockout mice); glucose uptake assays in primary adipocytes and skeletal muscle; phagocytosis, pinocytosis, and transferrin recycling assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genetic knockout with multiple orthogonal functional assays; negative result reported with high rigor\",\n      \"pmids\": [\"11238894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"VAMP3 and VAMP8 are the VAMP isoforms present in human platelets and form SNARE complexes with syntaxin 4; recombinant VAMP3 (but not VAMP2) blocked alpha-granule secretion and nearly completely inhibited dense-granule secretion in permeabilized platelets, demonstrating VAMP3 is required for platelet granule secretion.\",\n      \"method\": \"Mass spectrometry co-immunoprecipitation (nano-LC-MS/MS) from platelets with syntaxin 4; recombinant VAMP competition assay in streptolysin O-permeabilized platelets; flow cytometry (P-selectin) and radiolabel serotonin release\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro reconstitution-type competition assay with recombinant proteins, MS-based identification, multiple orthogonal granule secretion readouts\",\n      \"pmids\": [\"12130530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"VAMP3-null macrophages show transiently slower uptake of zymosan (but not IgG-beads, complement-opsonized particles, or latex microspheres) at early time points (5–15 min), indicating VAMP3 modulates efficient zymosan uptake but is not absolutely required for phagocytosis.\",\n      \"method\": \"VAMP3 knockout mouse-derived bone marrow macrophages; phagocytosis assays with multiple particles; phagosome maturation assay (LAMP-1 acquisition)\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with multiple particle types and time points, single lab\",\n      \"pmids\": [\"12101283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"VAMP3 forms fusogenic SNARE complexes with syntaxin1/SNAP-25, syntaxin1/SNAP-23, and syntaxin4/SNAP-25, but not with syntaxin4/SNAP-23; deletion of the N-terminal domain of syntaxin4 enhanced membrane fusion more than two-fold, indicating this domain negatively regulates fusion.\",\n      \"method\": \"Cell fusion assay using full-length SNARE proteins expressed in cells; deletion mutagenesis of syntaxin4 N-terminal domain\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional fusion assay with mutagenesis, single lab, no structural validation\",\n      \"pmids\": [\"17651732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"VAMP3 (v-SNARE) is required for fusion of multivesicular bodies (MVBs) with autophagosomes to generate amphisomes in K562 cells; knockdown of VAMP3 blocked this MVB-autophagosome fusion step but did not affect subsequent fusion with lysosomes, which instead requires VAMP7.\",\n      \"method\": \"siRNA knockdown; morphological, molecular, and biochemical analyses of autophagosome/MVB fusion in K562 cells\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with specific functional readout (amphisome formation), pathway-position epistasis established, single lab\",\n      \"pmids\": [\"19781582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"VAMP3 co-localizes with MMP2, MMP9, and MT1-MMP in HT-1080 fibrosarcoma cells; dominant-negative VAMP3 mutants, RNAi, and tetanus toxin cleavage of VAMP3 impaired secretion of MMP2/MMP9, trafficking of MT1-MMP to the cell surface, gelatin degradation, and cell invasion.\",\n      \"method\": \"Dominant-negative SNARE expression; siRNA/RNAi; tetanus toxin; co-localization by immunofluorescence; gelatin degradation assay; Boyden chamber invasion assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three independent inhibitory approaches (DN, RNAi, toxin) plus multiple functional readouts (secretion, trafficking, degradation, invasion)\",\n      \"pmids\": [\"19910495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"VAMP3 silencing reduces beta1-integrin levels at the cell surface (without affecting total integrin) and inhibits chemotactic cell migration by >60%, establishing VAMP3 as required for trafficking of beta1-integrin to the plasma membrane and for cell migration.\",\n      \"method\": \"siRNA knockdown; flow cytometry (surface beta1-integrin); chemotaxis migration assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with surface vs. total integrin quantification, single lab, two orthogonal readouts\",\n      \"pmids\": [\"19159614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"VAMP3 (but not VAMP8) is present on Weibel-Palade bodies (WPBs) and forms a stable SNARE complex with syntaxin 4 and SNAP23 in endothelial cells; soluble VAMP3 cytoplasmic domain mutants (but not VAMP8 mutants) interfere with Ca2+-triggered vWF secretion from permeabilized endothelial cells.\",\n      \"method\": \"Immunofluorescence co-localization; co-immunoprecipitation; permeabilized endothelial cell secretion assay with dominant-negative SNARE mutants; immunoblotting\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution-type permeabilized cell assay with DN mutants, reciprocal Co-IP, mechanistic selectivity demonstrated (VAMP3 vs VAMP8)\",\n      \"pmids\": [\"21094665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP3 mediates fusion of recycling-endosome-derived vesicles carrying PLP with the oligodendroglial plasma membrane; Syntaxin-4 was identified as the prime acceptor Q-SNARE for VAMP3 in this context. Interference with VAMP3 by siRNA or dominant-negative expression diminished PLP transport to the cell surface.\",\n      \"method\": \"siRNA knockdown; dominant-negative VAMP3 expression; co-localization; VAMP3-deficient mice; mocha mutant mice analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple inhibitory approaches plus in vivo mouse model, single lab\",\n      \"pmids\": [\"21490207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The VAMP3/Stx4/SNAP23 SNARE complex regulates macrophage adhesion, spreading, and persistent migration on fibronectin by mediating polarized exocytosis of VAMP3-positive recycling endosome membrane; reduction of VAMP3 disrupted podosome superstructure organization and polarized podosome localization during migration.\",\n      \"method\": \"shRNA knockdown and overexpression; live-cell and fixed immunofluorescence; cell spreading and migration assays on fibronectin\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD plus OE with specific cellular phenotype readouts, SNARE complex placement, single lab\",\n      \"pmids\": [\"21586284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VAMP3 and syntaxin 6 (STX6) form a v-/t-SNARE complex; endocytosed alpha3beta1-integrin traffics through VAMP3-containing recycling endosomes before delivery via STX6-containing trans-Golgi network compartments to the plasma membrane. VAMP3 is required for alpha3beta1-integrin delivery to the cell surface.\",\n      \"method\": \"Co-immunoprecipitation of VAMP3-STX6 complex; siRNA knockdown; immunofluorescence co-localization; integrin surface delivery assay; chemotaxis migration assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus KD with functional integrin-trafficking readout, single lab\",\n      \"pmids\": [\"22573826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VAMP3 is a direct ubiquitylation target of goliath-family E3 ubiquitin ligases (Drosophila Goliath/Godzilla, human RNF167); ubiquitylation of VAMP3 by Godzilla/RNF167 abrogates normal recycling endosome trafficking, and mutation of Godzilla ubiquitylation target lysines on VAMP3 blocks formation of enlarged Rab5-positive endosomes.\",\n      \"method\": \"Ubiquitylation assays; site-directed mutagenesis of VAMP3 lysines; overexpression and loss-of-function in Drosophila and mammalian cells; endosome morphology analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of ubiquitylation sites with functional rescue, cross-species validation (Drosophila + human RNF167), multiple orthogonal methods\",\n      \"pmids\": [\"23353890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VAMP3 and SNAP23 mediate Ca2+-dependent secretion of IL-6 and TNFα from synovial sarcoma cells; a VAMP3 antibody co-precipitated SNAP23 and syntaxin-2 (and syntaxin-3 to a lesser extent), and SNAP23/VAMP3 form SDS-resistant complexes that are disrupted upon SNAP23 knockdown.\",\n      \"method\": \"siRNA knockdown; ELISA cytokine secretion assay; co-immunoprecipitation; SDS-resistant SNARE complex assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus KD with cytokine secretion readout, single lab\",\n      \"pmids\": [\"24373201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Phosphatidylinositol 4-kinase IIα (PI4K2A) physically interacts with VAMP3 on tubulo-vesicular endosomes; PI4K2A knockdown inhibits VAMP3 trafficking to perinuclear membranes, impairs VAMP3-mediated transferrin receptor recycling, and decreases VAMP3 association with its cognate Q-SNARE Vti1a. Acute depletion of PtdIns4P on endosomes significantly delays VAMP3 trafficking.\",\n      \"method\": \"Co-immunoprecipitation; MS interactome; siRNA knockdown; transferrin receptor recycling assay; co-localization; acute PtdIns4P depletion\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, MS-identified binding partner, multiple KD phenotypes and acute lipid depletion experiments, mechanistic link to SNARE pairing established\",\n      \"pmids\": [\"25002402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VAMP3 is required for efficient entry of Uukuniemi virus (bunyavirus) into cells; viruses enter VAMP3-positive endosomal vesicles within 5 min of internalization; in VAMP3-depleted cells, viruses are trapped in LAMP1-negative compartments. Tetanus toxin cleavage of VAMP3 blocks infection.\",\n      \"method\": \"Genome-wide siRNA screens (two independent libraries); siRNA-mediated VAMP3 depletion; tetanus toxin inactivation; fluorescence live and fixed-cell imaging; LAMP1 co-localization\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide screen hit validated by two independent siRNA libraries, tetanus toxin, and live imaging with specific compartment readout\",\n      \"pmids\": [\"24850728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Rab8 is required for VAMP3 clustering at the immune synapse in T cells; in dominant-negative Rab8 T cells, TCR-positive endosomes polarized normally to the synapse but could not dock/fuse because VAMP3 failed to cluster there. VAMP3 also interacts with Rab8 at the base of the cilium in NIH-3T3 cells.\",\n      \"method\": \"Dominant-negative Rab8 expression; immunofluorescence co-localization; TCR recycling assay at the immune synapse; co-localization of VAMP3 with Rab8 in cilia\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DN Rab8 with specific mechanistic consequence (VAMP3 clustering failure), cross-cell-type validation, single lab\",\n      \"pmids\": [\"26034069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VAMP3 vesicles in cortical astrocytes undergo Ca2+-independent exo-endocytotic cycling at the plasma membrane and regulate the recycling/surface expression of plasma membrane glutamate transporters; cAMP modulates VAMP3 vesicle cycling and glutamate uptake. Astrocytes express VAMP3 but not VAMP2.\",\n      \"method\": \"VAMP2 and VAMP3 knockout mice; STED and TIRF microscopy; single-vesicle imaging; glutamate uptake assay; optogenetics and pharmacology to modulate cAMP\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic KO combined with super-resolution live imaging and functional transporter assay, multiple orthogonal methods\",\n      \"pmids\": [\"25864578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VAMP2, VAMP3, and VAMP8 are internalized via clathrin-independent endocytosis stimulated by Shiga toxin; Shiga toxin increases VAMP3 uptake even when clathrin-dependent endocytosis is blocked, and toxin trafficking/intoxication relies on these SNAREs.\",\n      \"method\": \"Fluorescence imaging of VAMP internalization; clathrin inhibition; Shiga toxin trafficking assays; intoxication assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple inhibitory conditions, functional intoxication readout, single lab\",\n      \"pmids\": [\"26071526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VAMP3 interacts with NKCC2 co-transporter and co-localizes at the TAL apical surface; in vivo silencing of VAMP3 blocks constitutive (but not cAMP-stimulated) NKCC2 exocytic delivery to the apical membrane. VAMP3 knockout mice show decreased NKCC2 expression, increased urinary electrolyte/water excretion, and lower blood pressure.\",\n      \"method\": \"Co-immunoprecipitation (VAMP3-NKCC2); in vivo siRNA silencing in rat TAL; surface biotinylation; exocytic delivery assay; VAMP3 knockout mice; blood pressure measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo gene silencing plus KO mouse, Co-IP, surface biotinylation, physiological readouts, multiple orthogonal approaches\",\n      \"pmids\": [\"27551042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The STX6-VTI1B-VAMP3 SNARE complex forms on recycling endosomes and is required for fusion between recycling endosomes (REs) and GAS-containing autophagosome-like vacuoles (GcAVs) during xenophagy; STX6 localizes to GcAVs via tyrosine-based sorting motif and H2 SNARE domain; RABGEF1 mediates the RE-GcAV fusion through this complex.\",\n      \"method\": \"Co-immunoprecipitation of SNARE complex; siRNA knockdown and CRISPR knockout of STX6, VAMP3, VTI1B; GAS xenophagy assay; co-localization by immunofluorescence\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP demonstrating ternary complex, CRISPR KO plus RNAi with specific functional readout (GAS clearance), multiple proteins validated, single lab\",\n      \"pmids\": [\"27791468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VAMP3 and SNAP23 mediate disturbed-flow (oscillatory shear)-induced endothelial secretion of miR-126-3p and other microRNAs into non-membrane-bound extracellular form; knockdown of VAMP3/SNAP23 reduces endothelial miRNA secretion and SMC proliferation/migration. mTORC1 inhibition blocks this secretion via transcriptional suppression of VAMP3 and SNAP23.\",\n      \"method\": \"siRNA knockdown; shear stress in vitro system; qPCR/miRNA quantification; SMC co-culture proliferation/migration assays; in vivo rapamycin treatment; carotid artery ligation model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro KD plus in vivo mouse model, pharmacological inhibition, multiple functional readouts including neointima formation\",\n      \"pmids\": [\"28716920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VAMP3/Syb (Drosophila ortholog) and YKT6 are required for constitutive secretory carrier fusion with the plasma membrane; combinatorial RNAi depletion in Drosophila cells identified SNARE complexes including STX1/SNAP24/29/Syb; RNAi depletion of YKT6 and VAMP3 in mammalian cells also blocked constitutive secretion.\",\n      \"method\": \"Quantitative secretion assay; combinatorial RNAi depletion in Drosophila S2 cells and mammalian cells\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combinatorial RNAi with quantitative secretion assay, cross-species validation, single lab\",\n      \"pmids\": [\"28403141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"WDFY2 physically interacts with VAMP3 on endosomal tubules enriched in PtdIns3P; WDFY2 knockout causes redistribution of VAMP3 into small vesicles near the plasma membrane, leading to increased VAMP3-dependent secretion of MT1-MMP, enhanced ECM degradation, and increased cell invasion.\",\n      \"method\": \"Co-immunoprecipitation (WDFY2-VAMP3 interaction); CRISPR knockout of WDFY2; immunofluorescence redistribution of VAMP3; MT1-MMP secretion assay; ECM degradation assay; invasion assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO plus Co-IP binding partner identification, multiple downstream functional readouts, mechanistic model with VAMP3 as effector\",\n      \"pmids\": [\"31253801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"bFGF signaling increases VAMP3 abundance on neuronal extracellular vesicles and enhances MVB-plasma membrane fusion in hippocampal neurons; VAMP3 knockdown attenuates bFGF-induced EV release, establishing VAMP3 as mediating bFGF-regulated neuronal exosome secretion.\",\n      \"method\": \"Patch-clamp electrophysiology with pH-sensitive dye imaging of MVB-PM fusion; proteomics of neuronal EVs; siRNA knockdown; nanoparticle tracking\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — real-time single-neuron fusion imaging plus proteomics plus KD, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"32195080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VAMP3 and SNAP23 mediate oscillatory shear-induced endothelial VWF secretion; oscillatory shear promotes translocation of VAMP3 and SNAP23 to the plasma membrane; knockdown of VAMP3/SNAP23 reduces VWF secretion and platelet aggregation, and systemic VAMP3/SNAP23 inhibition ameliorates FeCl3-induced thrombogenesis in mice.\",\n      \"method\": \"siRNA knockdown; intracellular localization by immunofluorescence; VWF ELISA; platelet aggregation assay; in vivo carotid artery thrombosis model (FeCl3); intraluminal overexpression\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro KD plus in vivo mouse model, multiple functional readouts, single lab\",\n      \"pmids\": [\"33224946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hrd1 E3 ubiquitin ligase ubiquitylates VAMP3, and H2S promotes Hrd1 S-sulfhydration at Cys115, which enhances VAMP3 ubiquitylation and prevents CD36 translocation to the plasma membrane; Hrd1 Cys115 mutation abolished VAMP3 ubiquitylation and increased CD36/VAMP3 plasma membrane expression and lipid droplet formation.\",\n      \"method\": \"S-sulfhydration assay; immunoprecipitation for ubiquitylation; LC-MS/MS; site-directed mutagenesis (Hrd1 Cys115); siRNA knockdown; Western blot; lipid droplet staining\",\n      \"journal\": \"Aging and disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus ubiquitylation IP plus MS identification, single lab\",\n      \"pmids\": [\"32257542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VAMP3 in astrocytes selectively mediates the exocytosis of endocytosed BDNF; endocytic QD-BDNF particles are enriched in Vamp3-positive vesicles, and Vamp3 downregulation disrupts BDNF secretion without affecting BDNF uptake or intracellular transport.\",\n      \"method\": \"Quantum dot-conjugated BDNF (QD-BDNF) live tracking in cultured astrocytes; siRNA knockdown of Vamp3; confocal imaging of ATP-evoked exocytosis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-vesicle live imaging with KD, specific uptake vs. secretion dissection, single lab\",\n      \"pmids\": [\"34707216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Five chlamydial inclusion membrane proteins (Incs) transiently and temporally interact with VAMP3 during Chlamydia trachomatis infection; loss of incA or ct813 expression altered VAMP3 localization to the inclusion. VAMP3 (and VAMP4) are recruited to the chlamydial inclusion during mid-developmental cycle requiring de novo chlamydial protein synthesis.\",\n      \"method\": \"Inducible FLAG-Inc expression in C. trachomatis transformants; co-immunoprecipitation; immunofluorescence localization in infected cells; two complementary experimental systems\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two complementary experimental systems, co-IP in infected cells, genetic loss-of-function for specific Incs, single lab\",\n      \"pmids\": [\"33229367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"VAMP3 in mast cells (RBL-2H3) mediates secretory granule fusion and degranulation upon FcεRI activation; VAMP3 knockdown decreases degranulation, impairs CD63-marked granule enlargement (homotypic fusion), and reduces FcεRI surface expression by disrupting plasma membrane homeostasis. VAMP3 KD also dysregulates endocytosis and lipid raft formation.\",\n      \"method\": \"shRNA-mediated VAMP3 knockdown; degranulation assay; CD63-GFP fluorescence granule imaging; flow cytometry (FcεRI surface expression); intracellular Ca2+ response; cytokine ELISA\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable shRNA KD with multiple orthogonal functional readouts, single lab\",\n      \"pmids\": [\"35990647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Galectin-9 physically interacts with VAMP3 (identified by immunoprecipitation-mass spectrometry) in dendritic cells; galectin-9 depletion causes cytokine-containing vesicles to accumulate in the Golgi and undergo lysosomal degradation rather than being secreted, and galectin-9 is required for rerouting VAMP3-containing endosomes upon DC activation.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (galectin-9 interactome); siRNA knockdown; immunofluorescence (vesicle accumulation in Golgi); cytokine secretion assay\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based binding partner identification plus KD with vesicle trafficking phenotype, single lab\",\n      \"pmids\": [\"37755527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Myeloid-specific VAMP3 knockout (LysM-Cre x Vamp3-flox) mice show significantly reduced TNF-α and IL-6 release from macrophages, decreased CFA-induced paw edema, and reduced mechanical allodynia and thermal hyperalgesia, demonstrating VAMP3 in macrophages mediates inflammatory cytokine secretion and contributes to inflammatory pain.\",\n      \"method\": \"Conditional myeloid-specific Vamp3 knockout mice; ELISA cytokine measurement; CFA inflammatory pain model; behavioral pain assays; RT-qPCR\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with multiple functional readouts (cytokine secretion, inflammation, pain behavior), rigorous genetic approach\",\n      \"pmids\": [\"37965323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VAMP3 on transferrin receptor (TfR) vesicles interacts with the t-SNARE syntaxin 4 (restricted to the basolateral membrane of HBMECs) to mediate fusion of TfR transcytotic vesicles with the basolateral membrane; silencing VAMP3 reduces TfR transcytosis and NMEC brain penetration in vitro and in vivo; NMEC infection upregulates VAMP3 and syntaxin 4 via TLR4-TRAM-TRIF-TRAF3-IKK-IRF3 signaling to enhance transcytosis.\",\n      \"method\": \"Co-immunoprecipitation (VAMP3-syntaxin 4); siRNA knockdown and overexpression in BBB model; VAMP3 KO mice; transferrin transcytosis assay; NMEC brain penetration assay; signaling pathway inhibitors\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus KO mouse plus in vitro KD/OE with multiple functional readouts (transcytosis, bacterial penetration), pathway delineated, rigorous multi-approach study\",\n      \"pmids\": [\"40601634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Phosphorylation of VAMP3 (upon LPS stimulation of dendritic cells) releases VAMP3 from the chaperone WDFY2, enabling IL-6-positive VAMP3-positive vesicles to traffic to and fuse with the plasma membrane via complex formation with STX4, mediating IL-6 secretion in a polarized manner.\",\n      \"method\": \"Quantitative TIRF microscopy; phosphoproteomic bioinformatic analysis; VAMP3 phospho-mutants; co-immunoprecipitation (VAMP3-WDFY2, VAMP3-STX4); IL-6 secretion assay; LPS stimulation of dendritic cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — phosphoproteomics-guided mechanism with phospho-mutant validation, multiple Co-IPs, quantitative single-vesicle TIRF imaging, functional secretion readout\",\n      \"pmids\": [\"40977280\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"H. pylori reduces METTL14-mediated m6A modification of VAMP3 mRNA (via upregulation of ATF3 suppressing METTL14), decreasing VAMP3 expression and promoting c-Met recycling via VAMP3/LC3C pathway, thereby accelerating gastric cancer progression.\",\n      \"method\": \"m6A modification assay; METTL14 knockdown/overexpression; ATF3 modulation; co-immunoprecipitation; in vitro/in vivo cancer cell proliferation/metastasis assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic manipulations with m6A mechanistic readout and functional cancer phenotype, single lab\",\n      \"pmids\": [\"39827141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Botulinum neurotoxin type DC (BoNT/DC) cleaves VAMP3 (and VAMP2) in melanocytes; VAMP3 knockdown (but not VAMP2 knockdown) reduces melanin content and arrests melanosome maturation at stage II (more early, fewer late-stage IV melanosomes), establishing VAMP3 as required for cargo (tyrosinase/PMEL) trafficking during melanogenesis.\",\n      \"method\": \"BoNT/DC cleavage of VAMPs; siRNA knockdown of VAMP3 and VAMP2; melanin content assay; electron microscopy of melanosome stages; multiple human melanocyte models\",\n      \"journal\": \"Toxicon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent inhibition methods (toxin cleavage + siRNA KD), VAMP3 vs VAMP2 selectivity demonstrated, EM structural readout, single lab\",\n      \"pmids\": [\"40286827\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VAMP3 (cellubrevin) is an R-SNARE (v-SNARE) resident on recycling endosomes that drives constitutive and regulated membrane fusion events across diverse cell types by forming ternary SNARE complexes with cognate t-SNAREs (principally syntaxin 4/SNAP23, syntaxin 4/SNAP25, and syntaxin 1/SNAP25, but not syntaxin 4/SNAP23 in vitro), mediating processes including recycling endosome-to-plasma-membrane delivery of integrins, GLUT4 vesicles (partially), NKCC2, MT1-MMP, and PLP; platelet and mast cell granule secretion; MVB-autophagosome fusion (amphisome formation); Weibel-Palade body and VWF exocytosis; MMP secretion and cell invasion; astrocyte glutamate transporter recycling and BDNF secretion; neuronal exosome release; and IL-6 secretion in dendritic cells upon LPS-induced phosphorylation that releases VAMP3 from its WDFY2 chaperone. Its trafficking is regulated by PI4K2A/PtdIns4P on endosomes, by ubiquitylation via Goliath/RNF167 E3 ligases, by Hrd1-mediated ubiquitylation downstream of H2S/S-sulfhydration, by m6A modification of its mRNA via METTL14, and by Rab8-dependent clustering; it interacts with Rab8, galectin-9, WDFY2, and multiple chlamydial Inc proteins.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VAMP3 (cellubrevin) is an R-SNARE (v-SNARE) resident on recycling endosomes that drives membrane fusion across diverse secretory and trafficking pathways by forming ternary SNARE complexes with cognate t-SNAREs [#4, #6, #10]. In cell fusion assays VAMP3 partners productively with syntaxin1/SNAP-25, syntaxin1/SNAP-23, and syntaxin4/SNAP-25, but not syntaxin4/SNAP-23, and the N-terminal domain of syntaxin4 negatively regulates fusion [#6]; in cellular contexts it assembles with syntaxin 4/SNAP23 on Weibel-Palade bodies, with STX6 and STX6/VTI1B on recycling endosomes, and with SNAP23/syntaxin-2 in cytokine-secreting cells [#10, #13, #22, #15]. Through these complexes VAMP3 mediates polarized exocytosis of recycling-endosome membrane to deliver cargo to the cell surface — \\u03b21- and \\u03b13\\u03b21-integrins, MT1-MMP and secreted MMP2/MMP9, the NKCC2 cotransporter, proteolipid protein, transferrin receptor, and transcytotic TfR vesicles across the blood-brain barrier — thereby supporting cell adhesion, migration, matrix degradation, invasion, and physiological electrolyte handling [#8, #9, #13, #21, #11, #34, #12]. It also serves as the fusion SNARE for regulated secretion in multiple cell types, including platelet alpha- and dense-granule release, mast cell degranulation, endothelial VWF secretion, astrocyte glutamate-transporter recycling and BDNF exocytosis, neuronal exosome release, and inflammatory cytokine (IL-6, TNF\\u03b1) secretion from macrophages and dendritic cells that contributes to inflammatory pain [#4, #31, #27, #19, #29, #26, #33, #35]. Within the autophagy/endosome system VAMP3 mediates MVB-autophagosome fusion (amphisome formation) and recycling-endosome fusion with bacteria-containing autophagic vacuoles during xenophagy [#7, #22]. VAMP3 activity is positioned and tuned by upstream regulators: PI4K2A/PtdIns4P promotes its endosomal trafficking and Q-SNARE pairing [#16], Rab8 drives its clustering at fusion sites [#18], the chaperone WDFY2 sequesters it on endosomal tubules until phosphorylation releases it for polarized secretion [#25, #35], and Goliath/RNF167 and Hrd1 E3 ligases ubiquitylate it to control recycling and cargo surface delivery [#14, #28]. Genetic knockout established that VAMP3 is dispensable for insulin-stimulated GLUT4 translocation, transferrin recycling, and bulk phagocytosis in vivo, defining its roles as selective rather than housekeeping [#3, #2].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established the foundational hypothesis that VAMP3 acts as a v-SNARE pairing with syntaxin 4 to drive regulated vesicle delivery to the plasma membrane.\",\n      \"evidence\": \"Dominant-negative cytoplasmic domain expression and syntaxin 4 co-IP of GLUT4 vesicles in adipocytes\",\n      \"pmids\": [\"9111311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not distinguish VAMP3 from other VAMP isoforms functionally\", \"Inferential for GLUT4 specifically; later challenged\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Resolved the GLUT4 question by showing VAMP2, not VAMP3, is the essential v-SNARE for insulin-stimulated GLUT4 translocation, refining VAMP3's substrate selectivity.\",\n      \"evidence\": \"Tetanus-toxin cleavage with toxin-resistant SNARE rescue and GLUT4 translocation imaging in L6 myoblasts\",\n      \"pmids\": [\"10888677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Negative result for VAMP3 does not exclude partial/redundant roles\", \"Cell-type specific (myoblasts)\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated VAMP3 delivers recycling-endosome membrane to nascent phagosomes, linking it to polarized focal exocytosis during membrane expansion.\",\n      \"evidence\": \"GFP/exofacial epitope tagging and live focal-exocytosis imaging in macrophages\",\n      \"pmids\": [\"10791982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative localization; SNARE partners at the phagosome not defined\", \"Functional requirement not genetically tested here\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genetic knockout defined VAMP3 as non-essential for bulk housekeeping trafficking, forcing the field toward specialized, redundancy-buffered roles.\",\n      \"evidence\": \"VAMP3-null mice with GLUT4, phagocytosis, pinocytosis, and transferrin recycling assays\",\n      \"pmids\": [\"11238894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensation by other VAMPs not excluded\", \"Specialized secretory pathways not assayed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified VAMP3 as a required v-SNARE for regulated granule secretion, expanding its role beyond constitutive recycling into regulated exocytosis.\",\n      \"evidence\": \"Recombinant VAMP competition in permeabilized platelets, MS co-IP with syntaxin 4, and granule-release readouts\",\n      \"pmids\": [\"12130530\", \"12101283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"VAMP3 vs VAMP8 redundancy in platelets partially overlapping\", \"Phagocytosis effect modest and particle-selective\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined VAMP3's permissive and forbidden SNARE pairings biochemically, establishing the combinatorial rules for its fusion activity.\",\n      \"evidence\": \"Cell fusion assay with full-length SNAREs and syntaxin4 N-terminal deletion mutagenesis\",\n      \"pmids\": [\"17651732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reconstituted liposome fusion or structural validation\", \"syntaxin4/SNAP-23 result conflicts with in-cell complexes reported elsewhere\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed VAMP3 at a specific autophagy step (MVB-autophagosome/amphisome fusion) distinct from the VAMP7-dependent lysosomal step, mapping its pathway position.\",\n      \"evidence\": \"siRNA knockdown with morphological and biochemical fusion analysis in K562 cells\",\n      \"pmids\": [\"19781582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"t-SNARE partners at MVB-autophagosome interface not defined here\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected VAMP3 to invasive cell behavior by showing it traffics MMPs and integrins to the surface to enable matrix degradation and migration.\",\n      \"evidence\": \"DN, RNAi, and tetanus toxin inhibition with secretion, surface-integrin, gelatin degradation, and invasion assays in fibrosarcoma cells\",\n      \"pmids\": [\"19910495\", \"19159614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SNARE partner for MMP/integrin carriers not fully resolved\", \"In vivo tumor relevance not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Generalized VAMP3's recycling-endosome-to-surface delivery role across cell types (oligodendrocyte PLP, macrophage podosome dynamics), identifying syntaxin 4 as the prime acceptor Q-SNARE.\",\n      \"evidence\": \"siRNA/DN, VAMP3-deficient and mocha mutant mice, and migration/spreading assays\",\n      \"pmids\": [\"21490207\", \"21586284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution vs other delivery routes unclear\", \"syntaxin4 assignment context-dependent\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified VAMP3-STX6 as an endosomal SNARE pairing routing integrin through recycling endosomes and the TGN to the surface, refining the trafficking itinerary.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA, surface-delivery and chemotaxis assays\",\n      \"pmids\": [\"22573826\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; STX6 vs syntaxin4 usage not reconciled mechanistically\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed ubiquitylation as a post-translational control of VAMP3 trafficking, showing E3 ligases gate its recycling-endosome function.\",\n      \"evidence\": \"Goliath/Godzilla/RNF167 ubiquitylation assays with VAMP3 lysine mutagenesis and endosome morphology in fly and mammalian cells\",\n      \"pmids\": [\"23353890\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Deubiquitylase and physiological signals that trigger ubiquitylation not defined\", \"Effect on SNARE complex assembly unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established a lipid- and kinase-dependent mechanism positioning VAMP3 on endosomes and licensing its Q-SNARE pairing.\",\n      \"evidence\": \"PI4K2A Co-IP/MS, siRNA, acute PtdIns4P depletion, and Vti1a association/transferrin recycling assays\",\n      \"pmids\": [\"25002402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PtdIns4P physically recruits/orients VAMP3 not structurally defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified Rab8 as the spatial regulator that clusters VAMP3 at fusion sites (immune synapse, cilium base), separating vesicle polarization from docking/fusion competence.\",\n      \"evidence\": \"Dominant-negative Rab8, TCR recycling, and co-localization across T cells and NIH-3T3 cells\",\n      \"pmids\": [\"26034069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect Rab8-VAMP3 link not established\", \"Effector bridging Rab8 to VAMP3 unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended VAMP3 to astrocyte physiology, showing Ca2+-independent cycling that controls surface glutamate transporters and endocytosed cargo recycling.\",\n      \"evidence\": \"VAMP2/VAMP3 KO mice, STED/TIRF single-vesicle imaging, and glutamate uptake assays\",\n      \"pmids\": [\"25864578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"cAMP-to-VAMP3 signaling link mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated in vivo physiological output of VAMP3 by linking it to constitutive NKCC2 apical delivery and blood-pressure regulation, and defined a STX6-VTI1B-VAMP3 xenophagy complex.\",\n      \"evidence\": \"VAMP3-NKCC2 Co-IP, in vivo TAL silencing and KO mice with blood pressure; ternary SNARE Co-IP and CRISPR KO in GAS xenophagy\",\n      \"pmids\": [\"27551042\", \"27791468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Constitutive vs stimulated delivery branch point not molecularly resolved\", \"RABGEF1-to-SNARE coupling detail limited\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Broadened VAMP3's secretory repertoire to shear-induced endothelial microRNA secretion and to general constitutive secretion conserved with the Drosophila ortholog.\",\n      \"evidence\": \"siRNA with shear-stress and miRNA secretion assays plus mTORC1 inhibition; combinatorial RNAi secretion assays across species\",\n      \"pmids\": [\"28716920\", \"28403141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of non-vesicular miRNA export via VAMP3 incomplete\", \"YKT6/VAMP3 functional relationship not dissected\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified WDFY2 as an endosomal chaperone that sequesters VAMP3 to restrain invasive secretion, establishing a brake on VAMP3-dependent MT1-MMP delivery.\",\n      \"evidence\": \"WDFY2-VAMP3 Co-IP, CRISPR KO, VAMP3 redistribution imaging, and MT1-MMP secretion/ECM degradation/invasion assays\",\n      \"pmids\": [\"31253801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger releasing VAMP3 from WDFY2 not defined here (later shown to be phosphorylation)\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked VAMP3 to neuronal exosome release, endothelial VWF secretion/thrombosis, and Hrd1/H2S-controlled CD36 surface delivery, showing signal-dependent tuning of VAMP3 output.\",\n      \"evidence\": \"bFGF-driven MVB-PM fusion imaging and EV proteomics; shear-induced VWF secretion with in vivo thrombosis model; Hrd1 S-sulfhydration and VAMP3 ubiquitylation assays\",\n      \"pmids\": [\"32195080\", \"33224946\", \"32257542\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SNARE partners for exosome/CD36 routes incompletely mapped\", \"Hrd1-VAMP3 ubiquitylation site not pinpointed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined VAMP3 as the exocytic SNARE for astrocyte BDNF release and as a host target hijacked by chlamydial Inc proteins, illustrating selectivity and pathogen subversion.\",\n      \"evidence\": \"QD-BDNF live tracking with Vamp3 KD; inducible FLAG-Inc expression and Co-IP/localization in C. trachomatis infection\",\n      \"pmids\": [\"34707216\", \"33229367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BDNF-loading SNARE partners undefined\", \"Functional consequence of Inc-VAMP3 interaction for infection unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed VAMP3 supports mast cell degranulation and plasma-membrane homeostasis, including homotypic granule fusion and receptor surface expression.\",\n      \"evidence\": \"shRNA KD with degranulation, CD63-GFP granule imaging, FcεRI surface flow cytometry in RBL-2H3 cells\",\n      \"pmids\": [\"35990647\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect effects on lipid rafts/endocytosis not separated\", \"SNARE partners in mast cell granules not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established in vivo that macrophage VAMP3 drives inflammatory cytokine secretion and contributes to inflammatory pain, and identified galectin-9 as a partner rerouting VAMP3 vesicles for secretion.\",\n      \"evidence\": \"Myeloid-specific Vamp3 KO with cytokine, edema, and pain assays; galectin-9 IP-MS, KD, and cytokine secretion in dendritic cells\",\n      \"pmids\": [\"37965323\", \"37755527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How galectin-9 mechanistically diverts vesicles from lysosomal degradation incomplete\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Integrated VAMP3 regulation into a phosphorylation-gated, WDFY2-chaperoned secretion switch, defined its role in BBB transcytosis and bacterial brain penetration, and connected its mRNA m6A regulation to gastric cancer and melanosome maturation.\",\n      \"evidence\": \"Phosphoproteomics with VAMP3 phospho-mutants, WDFY2/STX4 Co-IP and TIRF IL-6 imaging; VAMP3-syntaxin4 Co-IP with KO mice and transcytosis/penetration assays; METTL14 m6A and ATF3 modulation in cancer; BoNT/DC cleavage and KD in melanocytes\",\n      \"pmids\": [\"40977280\", \"40601634\", \"39827141\", \"40286827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific kinase phosphorylating VAMP3 not identified\", \"m6A reader linking modification to VAMP3 translation undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How VAMP3's many context-specific SNARE partner choices and post-translational marks (ubiquitin, phosphorylation, m6A) are integrated to select among its diverse cargo and fusion destinations remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of VAMP3 ternary complexes across its partner repertoire\", \"Kinase(s), DUBs, and m6A readers acting on VAMP3 unidentified\", \"Rules governing cargo-specific SNARE pairing not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [4, 6, 10, 22]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 13, 16, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 13, 16, 25]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [10, 12, 21, 34]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 26, 35]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 8, 10, 13, 21]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7, 22]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 31, 33, 35]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [9, 13, 34]}\n    ],\n    \"complexes\": [\n      \"VAMP3/syntaxin4/SNAP23 SNARE complex\",\n      \"STX6-VTI1B-VAMP3 SNARE complex\"\n    ],\n    \"partners\": [\n      \"STX4\",\n      \"SNAP23\",\n      \"STX6\",\n      \"VTI1B\",\n      \"WDFY2\",\n      \"PI4K2A\",\n      \"RAB8A\",\n      \"LGALS9\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}