{"gene":"VWF","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1985,"finding":"VWF cDNA was isolated, mapping the gene to chromosome 12p12–12pter; VWF mRNA accounts for ~0.3% of endothelial cell mRNA and was undetectable in several other tissues, establishing endothelial-cell-specific expression.","method":"cDNA cloning, chromosomal mapping, Northern blot/expression analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — foundational cDNA cloning with chromosomal localization, replicated across the field","pmids":["3874428"],"is_preprint":false},{"year":1986,"finding":"Full-length VWF cDNA encodes a 2813-aa pre-pro-protein with a highly repetitive domain structure (D1-D2-D'-D3-A1-A2-A3-D4-B1-B2-C1-C2), including a 741-aa propeptide (equivalent to von Willebrand Antigen II) and a 2050-aa mature subunit; in-vitro expression confirmed synthesis of the unglycosylated precursor.","method":"Full-length cDNA assembly, in vitro expression in mammalian cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — complete coding sequence determination with in vitro expression validation, foundational and widely replicated","pmids":["3019665"],"is_preprint":false},{"year":1987,"finding":"The VWF propeptide (domains D1-D2) is required for multimerization beyond the dimer stage but not for dimerization itself; COS-1 cells expressing propeptide-deleted VWF assembled only dimers, not higher multimers.","method":"Heterologous expression of wild-type and propeptide-deleted VWF cDNA in COS-1 cells, multimer analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution by mutagenesis/expression with clear functional readout; replicated by later studies","pmids":["3500851"],"is_preprint":false},{"year":2004,"finding":"VWF is both necessary and sufficient for Weibel-Palade body (WPB) formation in endothelial cells: VWD (VWF-null) canine aortic endothelial cells lacked WPBs, and re-expression of wild-type VWF restored WPBs that recruited endogenous P-selectin. VWF multimerization is not required for WPB creation, but the VWF propeptide alone cannot independently form WPBs.","method":"Expression of wild-type and mutant VWF in VWF-null canine endothelial cells; confocal immunostaining for P-selectin, VWFpp, and VWF","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function (VWF-null cells) plus rescue experiments with multiple VWF constructs, orthogonal readouts","pmids":["15331450"],"is_preprint":false},{"year":2005,"finding":"VWF binding to platelet GPIb-IX initiates a signaling cascade (Lyn → Src → Syk → SLP-76 → PI3K → PLCγ2 → PKC) leading to thromboxane A2 (TXA2) production, which is required for αIIbβ3 activation and platelet aggregation. LAT and FcRγ-chain are not required for TXA2 production but are required for granule secretion and aggregation.","method":"Mouse platelets genetically deficient in Lyn, Src, Syk, SLP-76, PLCγ2, LAT, or FcRγ-chain; wortmannin inhibition; botrocetin/VWF stimulation assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple individual knockout lines plus pharmacological inhibitors establishing pathway order","pmids":["15985541"],"is_preprint":false},{"year":2005,"finding":"VWF/GPIb-induced platelet aggregation requires Src family kinase- and ERK-mediated TXA2 generation; Erk2 phosphorylation and TXA2 release were abolished by the Src inhibitor PP2 and the PLC inhibitor U73122, and MEK inhibition (U0126) abolished VWF-induced aggregation in non-aspirin-treated platelets.","method":"Pharmacological inhibition (PP2, U73122, U0126, aspirin) in washed human platelets stimulated with VWF/ristocetin; Erk2 phosphorylation assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal pharmacological inhibitors defining pathway hierarchy, single lab","pmids":["16020504"],"is_preprint":false},{"year":2006,"finding":"Bruton tyrosine kinase (Btk) is essential for VWF/GPIb-induced TXA2 production and GPIb-dependent arterial thrombus formation in vivo; Btk acts downstream of Lyn, Syk, SLP-76, and PI3K and upstream of ERK1/2, PLCγ2, and PKC in the signaling cascade.","method":"Btk-deficient mouse platelets; botrocetin/VWF stimulation; ferric chloride carotid artery thrombosis model; pharmacological epistasis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus in vivo thrombosis model, pathway placement by genetic and pharmacological epistasis","pmids":["16788103"],"is_preprint":false},{"year":2007,"finding":"ADAMTS13 preferentially cleaves platelet-VWF complexes under fluid shear stress rather than soluble VWF alone; platelet-dependent cleavage was blocked by anti-GPIbα antibody or soluble GPIbα fragment, and consumed large VWF multimers selectively.","method":"Cone-plate viscometer shear assay; anti-GPIbα blocking; multimeric gel analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — biochemical reconstitution with specific blocking reagents and multimer readout, single lab with orthogonal approaches","pmids":["17901248"],"is_preprint":false},{"year":2007,"finding":"N-linked glycans on VWF modulate its susceptibility to ADAMTS13 cleavage; removal of N-linked glycans (PNGaseF) increased ADAMTS13 affinity ~4-fold and allowed cleavage without denaturant. Specific mutation of N1574 (not N1515) increased ADAMTS13 proteolysis and allowed cleavage in the absence of urea, at least partly through a conformational mechanism.","method":"PNGaseF deglycosylation; site-directed mutagenesis of N1515 and N1574; surface plasmon resonance; ADAMTS13 cleavage assays with recombinant VWF and isolated VWF-A2 domain","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with site-directed mutagenesis and multiple binding/cleavage assays, single lab","pmids":["17975018"],"is_preprint":false},{"year":2009,"finding":"Rab27a and its effector MyRIP localize to mature Weibel-Palade bodies and anchor them to peripheral actin; siRNA depletion of either protein caused loss of peripheral WPB localization, increased basal and stimulated VWF secretion, and release of less-multimerized VWF, resulting in shorter VWF strings under flow.","method":"siRNA depletion in primary human endothelial cells; live imaging; VWF multimer analysis; flow-based string assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with multiple orthogonal readouts (localization, secretion, multimer size, string length) in primary cells","pmids":["19270261"],"is_preprint":false},{"year":2009,"finding":"Endothelial ADAMTS13 is released constitutively from the Golgi to the cell exterior without storage organelle, and cleaves secreted and cell-anchored VWF strings at Y1605-M1606 progressively; blocking different ADAMTS13 domains with antibodies revealed ADAMTS13 attachment along the length of VWF strings.","method":"HUVEC culture under static conditions; ADAMTS13 mRNA quantification; anti-ADAMTS13 domain antibody blockade; VWF string cleavage assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-based mechanistic study with antibody domain mapping and quantitative cleavage assays, single lab with multiple orthogonal approaches","pmids":["19822897"],"is_preprint":false},{"year":2010,"finding":"The VWF propeptide (VWFpp) binds to the D'D3 domain of mature VWF with high affinity (KD = 0.2 nM at pH 6.2/10 mM Ca2+) and weaker but significant affinity under physiologic conditions (KD = 25 nM); this interaction in the circulation attenuates platelet adhesion and GpIbα-binding activity of VWF.","method":"Surface plasmon resonance; development of anti-VWF D'D3 monoclonal antibodies; flow chamber platelet adhesion assays; shear-induced platelet aggregation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative binding kinetics by SPR, functional blockade by domain-specific antibodies, multiple orthogonal assays in one study","pmids":["22452980"],"is_preprint":false},{"year":2010,"finding":"Thrombospondin-1 (TSP1) binds to VWF A2 and A3 domains and competitively inhibits ADAMTS13 binding and cleavage activity by up to 70%, providing a mechanism by which TSP1 protects VWF from ADAMTS13 proteolysis.","method":"ELISA-based binding assays with recombinant VWF domains (A1, A2, A3) and full-length VWF; Western blot and residual collagen-binding assay for ADAMTS13 activity inhibition","journal":"Thrombosis research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — solid-phase binding and activity assays, single lab, limited to in vitro biochemistry","pmids":["20705333"],"is_preprint":false},{"year":2010,"finding":"A homozygous N528S mutation in the VWF propeptide D2 domain introduces an ectopic N-glycosylation site near a disulfide isomerase consensus sequence, causing defective multimerization and failure of VWF trafficking to storage granules; wild-type propeptide alone trafficked normally, demonstrating that the defect is in mature VWF transport by its mutant propeptide.","method":"Patient phenotyping; heterologous mammalian cell expression of N528S-VWF; immunostaining; multimer analysis; propeptide trafficking assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — disease mutation with reconstituted expression, multiple functional and localization readouts in one study","pmids":["20335223"],"is_preprint":false},{"year":2013,"finding":"Gα12 and α-SNAP are obligatory mediators of both basal and thrombin-evoked VWF secretion from endothelial cells; Gα12 N-terminal residues 10-15 bind α-SNAP, and an α-SNAP binding-domain minigene peptide blocked both basal and evoked VWF secretion. Gαq/RhoA/p115-RhoGEF contribute to evoked but not basal VWF secretion.","method":"EC-specific Gα12/Gα13 knockout mice; siRNA knockdown in HUVECs; in vitro binding assays; overexpression of activated Gα12; isolated buffer-perfused mouse lungs","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mice + siRNA + binding assays + peptide inhibition across multiple orthogonal approaches","pmids":["24081657"],"is_preprint":false},{"year":2016,"finding":"Shear-induced unfolding of the VWF A2 domain permits ADAMTS13 cleavage of full-length VWF multimers; enzymatic rate shows a sigmoidal increase with shear rate (threshold γ̇1/2 = 5522/s) as measured in real time by fluorescence correlation spectroscopy, consistent with Brownian hydrodynamics simulations.","method":"Fluorescence correlation spectroscopy; microfluidic shear cell; multimer gel analysis; Michaelis-Menten kinetics under denaturing conditions; Brownian hydrodynamics simulations","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative in vitro reconstitution with real-time single-molecule readout and computational validation, single study","pmids":["26840720"],"is_preprint":false},{"year":2018,"finding":"Stabilin-2 on sinusoidal endothelial cells binds and internalizes VWF and FVIII in a VWF-dependent manner; stabilin-2-deficient mice showed prolonged VWF-FVIII half-life and decreased immune response to human VWF-FVIII complex, establishing stabilin-2 as a clearance and immunoregulatory receptor for the VWF-FVIII complex.","method":"Cell-based binding/internalization assays; stabilin-2 KO mice; pharmacokinetic infusion studies; immunogenic response quantification; heterologous expression of stabilin-2 variant p.E2377K","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro mechanistic studies corroborated by in vivo KO mouse pharmacokinetics and immunogenicity data, multiple orthogonal methods","pmids":["30124466"],"is_preprint":false},{"year":2018,"finding":"Extracellular vimentin on the endothelial surface tethers VWF strings via interaction with the VWF A2 domain; VWF string formation was reduced in vimentin-KO arteries and by treatment with recombinant A2 domain protein or anti-vimentin antibody; A2 protein improved cortical reperfusion after experimental stroke.","method":"Pressurized cerebral artery preparations; Vim-KO mice; recombinant A2 protein and antibody blocking; laser speckle contrast imaging; middle cerebral artery occlusion mouse model","journal":"Stroke","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, recombinant protein blocking, and antibody blocking converging on the same interaction, validated in vivo","pmids":["30355099"],"is_preprint":false},{"year":2019,"finding":"Extracellular PAD4 citrullinates ADAMTS13 on specific arginine residues, dramatically inhibiting its enzymatic activity; this leads to accumulation of VWF-platelet strings in vivo, accelerates thrombus formation after vessel injury, and can be reversed by injection of non-citrullinated recombinant ADAMTS13.","method":"Mass spectrometry identification of citrullination sites; in vitro ADAMTS13 activity assays; r-huPAD4 injection in mice; intravital microscopy of VWF-platelet strings; ferric chloride thrombosis model; patient plasma citrullination measurements","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry + in vitro enzymatic assay + in vivo mouse models + patient validation, multiple orthogonal methods","pmids":["31248335"],"is_preprint":false},{"year":2019,"finding":"CLEC4M on liver sinusoidal endothelial cells binds and internalizes FVIII through VWF-dependent and VWF-independent mechanisms; VWF-independent binding is mediated by mannose-exposed N-linked glycans on FVIII and involves clathrin-coated pit endocytosis for lysosomal catabolism.","method":"Cell-based binding/internalization assays in CLEC4M-expressing HEK293 cells; solid-phase binding assays; in vivo hydrodynamic liver transfer; immunohistochemistry","journal":"Journal of thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple in vitro assays plus in vivo validation with mechanistic dissection of VWF-dependent vs. independent pathways","pmids":["30740857"],"is_preprint":false},{"year":2020,"finding":"BLOC-2 and the exocyst complex cooperate in WPB biogenesis by mediating endosomal input required for VWF maturation into high-molecular-weight multimers; BLOC-2 depletion impairs WPB exocytosis, whereas exocyst depletion paradoxically augments exocytosis, identifying exocyst as a clamp on VWF release separable from its role in VWF maturation.","method":"siRNA depletion; immunoprecipitation of BLOC-2; small-molecule exocyst inhibitor (Endosidin2); WPB ultrastructure analysis; VWF multimer analysis of releasates","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identification of BLOC-2/exocyst complex, siRNA and chemical inhibition, multiple functional readouts, single study","pmids":["32614949"],"is_preprint":false},{"year":2021,"finding":"Endothelial VWF is critical for vaso-occlusion in sickle cell disease; endothelial-specific VWF deletion reduced hemolysis, vascular occlusion, and organ damage in TNF-induced VOE in humanized SCD mice, and ADAMTS13 administration reduced plasma VWF and attenuated inflammation and vaso-occlusion.","method":"Endothelial-specific VWF knockout mice crossed to humanized SCD mice; ADAMTS13 infusion; measurement of hemolysis, vascular occlusion, organ damage","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional endothelial KO plus ADAMTS13 rescue in a disease model, multiple mechanistic readouts","pmids":["35969769"],"is_preprint":false},{"year":2021,"finding":"Conformation-dependent hyperadhesive VWF with an exposed A1 domain is released acutely after traumatic brain injury and can be selectively blocked by a recombinant VWF A2-domain protein (A2), which reduced TBI-induced death by >50%, protected the endothelium from extracellular vesicle-induced injury, and prevented consumptive coagulopathy by blocking the exposed A1 domain.","method":"Recombinant VWF A2-domain protein infusion in mice with lateral fluid percussion TBI; measurement of platelet activation, microvesiculation, coagulation parameters, neurological function; endothelial protection assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function by domain-specific blocking protein with multiple mechanistic readouts, single study","pmids":["33507292"],"is_preprint":false},{"year":2021,"finding":"The VWF A1 domain contains a conserved cluster of four lysine residues (K1405-K1408) that mediates binding to macrophage LRP1 clusters II and IV; alanine mutagenesis of this cluster attenuated VWF binding to LRP1 and significantly reduced in vivo VWF clearance, establishing LRP1-mediated macrophage clearance as a physiologically relevant VWF degradation pathway.","method":"Alanine mutagenesis of K1405-K1408; binding assays with LRP1 clusters II and IV and HEK-LRP1 cells; in vivo clearance of VWF-4A mutant; BT200 (rondaptivon pegol) competition assays; macrophage galactose lectin and SR-AI binding assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-directed mutagenesis with in vitro binding assays and in vivo clearance validation, multiple receptor systems interrogated","pmids":["38996211"],"is_preprint":false},{"year":2022,"finding":"VWF mediates vascular smooth muscle cell (VSMC) proliferation and migration through binding of the VWF A2 domain to LRP4, which signals through αvβ3 integrin; siRNA against αv integrin or LRP4, and LRP inhibitor RAP, abolished proliferation; proximity ligation and immunoprecipitation confirmed LRP4-αvβ3 co-association. VWF-deficient mice showed reduced neointimal hyperplasia in carotid ligation and femoral denudation models.","method":"siRNA knockdown of αv integrin and LRP4; LRP inhibitor (RAP); confocal fluorescence microscopy; proximity ligation assay; immunoprecipitation; VWF-deficient mouse carotid and femoral injury models","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple siRNA knockdowns, co-IP, in vivo VWF-KO models, and domain-specific identification of A2 as the binding region","pmids":["33576766"],"is_preprint":false},{"year":2024,"finding":"Endothelial PTP1B deletion promotes VWF exocytosis by reducing PTP1B-mediated tyrosine dephosphorylation of SNAP23; increased SNAP23 phosphorylation enhances Weibel-Palade body membrane fusion and VWF release, which in turn drives neutrophil adhesion and venous thromboinflammation.","method":"Inducible endothelial PTP1B KO mice; inferior vena cava ligation thrombosis model; primary endothelial cell mechanistic studies; SNAP23 phosphorylation assays; VWF-blocking antibodies; intravital microscopy","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mice, molecular mechanism (SNAP23 phosphorylation) identified, multiple in vivo and in vitro orthogonal methods","pmids":["38563147"],"is_preprint":false},{"year":2002,"finding":"VWF interaction with GPIb-IX-V activates two distinct tyrosine kinase pathways in platelets: Pyk2 phosphorylation is independent of calcium mobilization and PKC but downstream of Syk, whereas FAK phosphorylation requires TXA2, αIIbβ3, calcium, and PKC; both kinases require actin polymerization and translocate to the cytoskeleton.","method":"Human platelet stimulation with vWF; inhibitors of TxA2, calcium chelation, PKC, Syk (piceatannol), cytochalasin D; RGDS peptide; FAK and Pyk2 phosphorylation immunoblotting","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors defining pathway hierarchy, single lab, human platelet biochemistry","pmids":["11916084"],"is_preprint":false},{"year":2004,"finding":"In botrocetin/VWF-stimulated washed platelets, GPIbα-mediated agglutination produces TXA2 via calcium-independent PKC and PLA2 activities; TXA2 causes dense granule secretion and, together with ADP, is required for αIIbβ3 activation and aggregation; α-granule secretion requires ADP signaling through P2Y1 then P2Y12.","method":"Mouse platelets deficient in TXA2 receptors, Gαq, or αIIbβ3; pharmacological inhibitors; botrocetin/VWF stimulation; granule secretion and aggregation assays","journal":"Journal of thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic knockouts plus inhibitors in one study, single lab","pmids":["15613029"],"is_preprint":false},{"year":2015,"finding":"Platelet-derived VWF is not required for normal hemostasis or arterial thrombosis, but aggravates ischemic stroke injury via a GPIb-dependent mechanism; platelet VWF blockade with anti-GPIb antibody reduced cerebral infarct size in chimeric mice carrying only platelet VWF.","method":"Bone marrow transplantation between C57BL/6J and Vwf−/− mice to generate platelet-VWF-specific chimeras; tail bleeding, carotid thrombosis, and middle cerebral artery occlusion models; GPIb-blocking antibody","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific chimeric KO models combined with pharmacological blockade and multiple in vivo functional readouts","pmids":["26209660"],"is_preprint":false},{"year":2016,"finding":"Vps33b facilitates VWF-positive vesicular trafficking in megakaryocytes to α-granule vacuoles; HSC-specific Vps33b deletion abolished α-granules in platelets and megakaryocytes, and disrupted co-localization of Sec22b with Vwf-positive vesicles; Vps33b associates with VIPAS39, α-tubulin, and SEC22B.","method":"Tamoxifen-inducible HSC-specific Vps33b KO mice; co-immunoprecipitation; mass spectrometry; immunoblotting; pull-down assays; confocal microscopy of proplatelet Vwf-positive vesicles","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with Co-IP identification of binding partners and localization studies, single lab","pmids":["27319744"],"is_preprint":false},{"year":2018,"finding":"SARS-CoV-2 spike protein S1 RBD induces endothelial VWF secretion through ACE2 in an ARF6 activation-dependent manner; pharmacological inhibitor studies defined a downstream signaling cascade from ACE2 to VWF exocytosis.","method":"In vitro endothelial cell stimulation with S1 RBD; pharmacological inhibitors of ACE2 signaling pathway components; ARF6 activation assay; VWF secretion measurement","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro pharmacological pathway dissection, single lab, abstract-level detail on specific inhibitors","pmids":["36982738"],"is_preprint":false},{"year":2012,"finding":"The GPIbα intracellular tail (last 24 residues containing 14-3-3 and PI3K binding sites) is required for VWF-dependent platelet signaling and GPVI-mediated signaling; GPIbαΔsig/Δsig platelets bound VWF normally but formed fewer filopodia, had decreased Syk phosphorylation and αIIbβ3 activation upon CRP stimulation, and formed smaller aggregates on collagen under shear.","method":"CRISPR-Cas9 GPIbα intracellular tail deletion mouse; flow-based platelet adhesion and aggregation assays; intracellular signaling (pSyk) assays; collagen microchannel aggregation at multiple shear rates","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR-generated mouse model with multiple orthogonal functional and signaling readouts, single study","pmids":["34134470"],"is_preprint":false},{"year":2012,"finding":"Increased inflammation in ADAMTS13-deficient mice after ischemic stroke is VWF-dependent: double-deficient (ADAMTS13−/−;VWF−/−) mice had the same reduced inflammation as VWF−/− mice alone, demonstrating that ADAMTS13 limits brain injury by reducing VWF-mediated neutrophil infiltration and cytokine production.","method":"ADAMTS13−/−, VWF−/−, and double-KO mice; transient middle cerebral artery occlusion; MPO activity; immunohistochemistry for neutrophils; cytokine quantification; neutrophil depletion","journal":"Journal of thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using three genotypes plus neutrophil depletion experiment establishing VWF as the downstream effector","pmids":["22712744"],"is_preprint":false},{"year":2003,"finding":"In porcine aortic endothelial cells lacking Weibel-Palade bodies, VWF propeptide traffics to the Golgi (cycling between stacked Golgi and earlier compartments) but mature VWF does not form WPBs and is not acutely released, demonstrating that VWF propeptide and mature VWF have divergent intracellular trafficking when WPBs are absent.","method":"RT-PCR; Western blot; immunostaining with Golgi marker; stimulated secretion assays in porcine and human aortic endothelial cells","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — comparative cell biology in primary cells with multiple markers, single lab, no functional rescue","pmids":["12618268"],"is_preprint":false},{"year":2000,"finding":"Expression of pro-VWF cDNA in VWF-negative ECV304 endothelial cells restored Weibel-Palade body formation and directed tissue-type plasminogen activator (t-PA) into these granules, demonstrating that VWF expression is sufficient to form functional secretory WPBs and that t-PA is co-stored with VWF in WPBs.","method":"Stable transfection of pro-VWF cDNA into ECV304 cells; immunostaining; stimulated secretion with calcium ionophore A23187; t-PA storage assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reconstitution of WPBs in VWF-null cells with functional secretion readout, single lab","pmids":["10634936"],"is_preprint":false},{"year":2021,"finding":"Slc44a2/HNA-3a expression on neutrophils mediates their adhesion to VWF under venous shear rates (100 s−1) independently of β2 integrin; HNA-3b-expressing neutrophils have impaired VWF adhesion; Slc44a2-KO mice show massively reduced neutrophil recruitment in inflamed mesenteric venules after endothelial degranulation.","method":"Flow chamber adhesion assays with transfected HEK293T cells or donor neutrophils; β2 integrin blocking; LPS preactivation; intravital microscopy in SLC44A2-KO mice after histamine stimulation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro flow assays with genetic variants plus in vivo KO mouse intravital microscopy, multiple orthogonal approaches","pmids":["33556175"],"is_preprint":false},{"year":2006,"finding":"A single amino acid substitution R2657Q in the VWF protein (encoded by SNP +7970G>A in the CASA/RkJ Vwf allele) confers significantly increased VWF biosynthesis in vitro and elevated plasma VWF in vivo, representing a gain-of-function natural variant.","method":"In vitro recombinant VWF expression comparing A/J and CASA/RkJ alleles; SNP identification; quantitative biosynthesis assays; in vivo plasma VWF measurement in congenic mice","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — recombinant protein expression plus in vivo mouse validation with single causative SNP identified","pmids":["16873672"],"is_preprint":false},{"year":2018,"finding":"Two common VWF SNVs, rs1063856 (c.2365A>G) and rs1063857 (c.2385T>C), independently increase plasma VWF levels by prolonging VWF mRNA half-life (increased biosynthesis) and by reducing in vivo VWF clearance (lower VWFpp/VWF:Ag ratio; longer VWF half-life in Vwf-KO mice infused with recombinant VWF).","method":"Genotypic/phenotypic analysis in European controls; recombinant VWF expression in vitro; mRNA stability assays; in vivo pharmacokinetics in Vwf-KO mice","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — combined in vitro mRNA stability, in vitro recombinant protein assays, and in vivo mouse clearance studies providing mechanistic explanation","pmids":["29980574"],"is_preprint":false},{"year":2022,"finding":"Hyperglycemia-induced oxidative stress in endothelial cells upregulates VWF expression through the transcription factor GATA1, which drives vWF-mediated adhesion of tumor cells to the endothelium and promotes transendothelial migration and lung metastasis.","method":"STZ-induced hyperglycemia mouse model; primary lung EC gene expression; siRNA knockdown of vWF; chromatin immunoprecipitation for GATA1 on the vWF promoter; tumor adhesion and transendothelial migration assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishing GATA1 binding to vWF promoter, siRNA knockdown, in vivo mouse model, single lab","pmids":["35094008"],"is_preprint":false},{"year":2017,"finding":"GATA3 mediates upregulation of VWF transcription in lung adenocarcinoma tumor vasculature; conditioned media from A549 cancer cells increased vWF expression in HUVECs, and ChIP assays confirmed direct GATA3 binding to the +220 GATA binding motif on the human VWF promoter.","method":"Co-culture conditioned media system; ChIP assay; siRNA knockdown of GATA3 and ERG; immunohistochemistry of tumor microarrays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishing direct transcription factor-promoter interaction plus functional siRNA validation, single lab","pmids":["29299165"],"is_preprint":false},{"year":2016,"finding":"Hypoxia-induced HMGB1 upregulates vWF expression through a TLR2-MYD88-SP1 signaling pathway; TLR2 silencing abolished MYD88 expression, vWF expression, and SP1 phosphorylation, and blocked Sp1 binding to the Vwf promoter.","method":"Murine acute hypoxia model; TLR2 agonist/neutralizing antibody; HMGB1 inhibitor; Tlr2 siRNA silencing; SP1 inhibitor; promoter binding assay","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic silencing plus pharmacological inhibition establishing pathway order, with promoter binding evidence, single lab","pmids":["27480067"],"is_preprint":false},{"year":2021,"finding":"Staphylococcus aureus ClfA interacts with VWF via vWF-binding protein (vWbp) to form an ultra-strong ternary complex (~2000 pN); force spectroscopy showed that vWbp activates a direct, dock-lock-and-latch-type ClfA–VWF interaction, representing a mechanism of bacterial exploitation of VWF for adhesion.","method":"Atomic force microscopy–based single-molecule force spectroscopy on living bacteria; recombinant protein binding experiments","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — single-molecule force spectroscopy with structural mechanism identified, single lab, no complementary biochemical validation beyond force measurements","pmids":["33846500"],"is_preprint":false},{"year":2017,"finding":"Hagfish (Myxine glutinosa) possess a functional Vwf gene encoding a simpler protein than gnathostome VWF that notably lacks an A3 domain (collagen-binding domain present only in jawed vertebrates); hagfish Vwf forms high-molecular-weight multimers in plasma and CHO cells, and botrocetin promotes VWF-dependent thrombocyte aggregation, establishing VWF as originating in the ancestral vertebrate after divergence from urochordates.","method":"Genomic identification; stable CHO cell expression; multimer analysis; botrocetin-induced aggregation assays; immunohistochemistry; electron microscopy for Weibel-Palade bodies","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — recombinant expression, functional aggregation assay, and ultrastructural evidence in a single evolutionary study","pmids":["28899852"],"is_preprint":false}],"current_model":"VWF is a large multimeric glycoprotein synthesized in endothelial cells and megakaryocytes as a pre-pro-protein whose propeptide (D1-D2 domains) is obligatory for multimerization beyond dimers and for Weibel-Palade body (WPB) biogenesis; mature VWF stored in WPBs is released constitutively and in a regulated manner controlled by Gα12/α-SNAP (basal and evoked) and Gαq/RhoA (evoked), with Rab27a/MyRIP anchoring mature WPBs to peripheral actin to prevent premature release, and BLOC-2/exocyst regulating endosomal input during VWF maturation and clamping exocytosis; upon secretion, VWF strings are tethered to the endothelial surface through an interaction between the VWF A2 domain and extracellular vimentin, and are cleaved at Y1605-M1606 by ADAMTS13 in a shear-force-dependent manner that requires unfolding of the A2 domain (regulated by N1574 glycosylation), with platelet-VWF complexes being preferred substrates; VWF binds platelet GPIbα via its A1 domain to initiate signaling through Lyn→Src→Syk→SLP-76→PI3K→Btk→ERK/PLCγ2→PKC→TXA2 leading to αIIbβ3 activation, while the GPIbα intracellular tail transduces both VWF- and collagen/GPVI-mediated signals; circulating VWFpp remains non-covalently bound to mature VWF at the D′D3 domain to attenuate platelet adhesion; plasma clearance of the VWF-FVIII complex is mediated by sinusoidal endothelial receptors stabilin-2, CLEC4M (via mannose glycans on FVIII), and LRP1 on macrophages (via K1405-K1408 in the A1 domain); VWF also mediates vascular smooth muscle cell proliferation via A2-domain binding to LRP4 and αvβ3 signaling, and endothelial PTP1B normally suppresses VWF exocytosis by dephosphorylating SNAP23."},"narrative":{"mechanistic_narrative":"VWF is a large, endothelial- and megakaryocyte-derived multimeric glycoprotein that links primary hemostasis to platelet adhesion, thrombus formation, and vascular inflammation [PMID:3874428, PMID:15985541]. It is synthesized as a 2813-aa pre-pro-protein with a repetitive domain architecture (D1-D2-D'-D3-A1-A2-A3-D4-B1-B2-C1-C2), whose D1-D2 propeptide is obligatory for assembly of dimers into higher-order multimers, while dimerization itself is propeptide-independent [PMID:3019665, PMID:3500851]. VWF expression is both necessary and sufficient to drive biogenesis of Weibel-Palade bodies (WPBs), the endothelial storage granules into which it recruits cargo such as P-selectin and t-PA; multimerization is dispensable for WPB formation but propeptide-directed trafficking of mature VWF is required, and a propeptide D2-domain mutation (N528S) that introduces an ectopic glycan abolishes multimerization and storage [PMID:15331450, PMID:20335223, PMID:10634936]. WPB exocytosis is tightly gated: Gα12/α-SNAP mediate both basal and evoked secretion while Gαq/RhoA contribute to evoked release, Rab27a/MyRIP anchor mature WPBs to peripheral actin to restrain premature secretion, BLOC-2/exocyst control endosomal input and clamp release, and endothelial PTP1B suppresses exocytosis by dephosphorylating SNAP23 [PMID:19270261, PMID:24081657, PMID:32614949, PMID:38563147]. Once secreted, VWF strings are tethered to the endothelial surface through an A2-domain interaction with extracellular vimentin and are size-regulated by ADAMTS13, which cleaves the A2 domain at Y1605-M1606 in a shear-dependent manner requiring A2 unfolding (modulated by N1574 glycosylation), preferentially processing platelet-bound multimers [PMID:17901248, PMID:17975018, PMID:19822897, PMID:26840720, PMID:30355099]. The VWF A1 domain engages platelet GPIbα to initiate a Lyn→Src→Syk→SLP-76→PI3K→Btk→ERK/PLCγ2→PKC cascade culminating in thromboxane A2 generation and αIIbβ3 activation [PMID:15985541, PMID:16020504, PMID:16788103]. The circulating VWF propeptide remains non-covalently bound to the D'D3 domain of mature VWF and attenuates GPIbα-dependent platelet adhesion [PMID:22452980]. Plasma clearance of VWF and its associated FVIII is governed by sinusoidal stabilin-2 and CLEC4M and by macrophage LRP1 binding to a K1405-K1408 cluster in the A1 domain [PMID:30124466, PMID:30740857, PMID:38996211]. Beyond hemostasis, VWF promotes vascular smooth muscle cell proliferation via A2-domain binding to LRP4/αvβ3 signaling and drives thromboinflammation in ischemic stroke, sickle cell vaso-occlusion, traumatic brain injury, and venous thrombosis [PMID:35969769, PMID:33507292, PMID:33576766, PMID:22712744].","teleology":[{"year":1986,"claim":"Establishing the complete VWF coding sequence and domain architecture defined the modular protein from which all subsequent structure-function dissection proceeded.","evidence":"full-length cDNA assembly and in vitro expression of the precursor in mammalian cells","pmids":["3019665"],"confidence":"High","gaps":["Did not establish how individual domains map to specific binding partners","Glycosylation and multimer assembly not addressed"]},{"year":1987,"claim":"Resolved whether the propeptide is needed for assembly, showing it is obligatory for multimerization beyond dimers but not for dimerization itself.","evidence":"heterologous expression of propeptide-deleted VWF in COS-1 cells with multimer analysis","pmids":["3500851"],"confidence":"High","gaps":["Molecular mechanism by which the propeptide catalyzes inter-dimer disulfide bonding not defined","Did not address storage granule formation"]},{"year":2004,"claim":"Determined that VWF itself drives the biogenesis of its storage organelle, resolving whether WPBs require a dedicated scaffold or VWF alone.","evidence":"loss-of-function in VWF-null canine endothelial cells plus rescue with VWF constructs and orthogonal P-selectin/VWFpp readouts","pmids":["15331450","10634936"],"confidence":"High","gaps":["Trafficking machinery directing VWF to WPBs not identified here","Why propeptide alone is insufficient unresolved"]},{"year":2006,"claim":"Mapped the platelet GPIb-IX signaling cascade triggered by VWF engagement, establishing the kinase hierarchy ending in TXA2-dependent integrin activation.","evidence":"genetic knockout platelet lines (Lyn, Src, Syk, SLP-76, PLCγ2, Btk) plus pharmacological epistasis and an in vivo thrombosis model","pmids":["15985541","16020504","16788103","11916084","15613029"],"confidence":"High","gaps":["How A1-GPIbα binding mechanically couples to Lyn activation not resolved","Quantitative thresholds linking shear to signaling not defined"]},{"year":2007,"claim":"Showed that ADAMTS13 cleavage is conformationally and substrate-state regulated, preferentially processing shear-unfolded, platelet-bound VWF.","evidence":"cone-plate shear assay with anti-GPIbα blockade, deglycosylation, N1574 mutagenesis, SPR, and A2-domain cleavage assays","pmids":["17901248","17975018"],"confidence":"High","gaps":["In vivo contribution of N1574 glycosylation to multimer size unquantified","Structural basis of glycan-modulated unfolding not solved"]},{"year":2009,"claim":"Defined how secreted ADAMTS13 reaches and progressively cleaves cell-anchored VWF strings, and showed Rab27a/MyRIP anchoring controls multimer size of released VWF.","evidence":"HUVEC string cleavage with ADAMTS13 domain-antibody blockade and siRNA depletion of Rab27a/MyRIP with flow-based string assays","pmids":["19822897","19270261"],"confidence":"High","gaps":["Spatial regulation of constitutive ADAMTS13 release not fully defined","Link between actin anchoring and multimer maturation incompletely mapped"]},{"year":2010,"claim":"Established that the cleaved propeptide remains a functional regulator, binding D'D3 to attenuate platelet adhesion, and identified disease-relevant trafficking defects.","evidence":"SPR binding kinetics, domain-specific antibodies, flow chamber adhesion assays, and expression of the N528S propeptide mutant","pmids":["22452980","20335223","20705333"],"confidence":"High","gaps":["Physiological extent of propeptide-mediated suppression in vivo unquantified","TSP1 competition with ADAMTS13 limited to in vitro biochemistry"]},{"year":2013,"claim":"Identified the G-protein machinery distinguishing basal from evoked WPB exocytosis, with Gα12/α-SNAP obligatory for both and Gαq/RhoA selective for evoked release.","evidence":"EC-specific Gα12/13 KO mice, HUVEC siRNA, in vitro binding assays, and inhibitory minigene peptide in perfused lungs","pmids":["24081657"],"confidence":"High","gaps":["Upstream receptors coupling to Gα12 for basal secretion not defined","Membrane fusion machinery downstream not connected here"]},{"year":2016,"claim":"Provided quantitative single-molecule confirmation that shear-induced A2 unfolding gates ADAMTS13 cleavage above a defined shear threshold.","evidence":"fluorescence correlation spectroscopy in a microfluidic shear cell with Brownian hydrodynamics simulations","pmids":["26840720"],"confidence":"High","gaps":["In vivo shear-rate distributions relative to the measured threshold not mapped","Influence of platelet binding on the unfolding threshold not tested"]},{"year":2018,"claim":"Identified the receptor systems clearing the VWF-FVIII complex and the A2-vimentin tether retaining strings at the endothelial surface.","evidence":"stabilin-2 and CLEC4M binding/internalization assays with KO and PK studies, plus vimentin-KO arteries and A2-protein blocking with stroke models","pmids":["30124466","30740857","30355099"],"confidence":"High","gaps":["Relative quantitative contribution of each clearance receptor in humans not resolved","Mechanism coupling A2-vimentin tethering to string stability incomplete"]},{"year":2020,"claim":"Separated WPB maturation from exocytic control, identifying BLOC-2 as required for endosomal input/maturation and exocyst as a paradoxical clamp on release.","evidence":"siRNA depletion, BLOC-2 reciprocal Co-IP, exocyst inhibitor Endosidin2, and WPB ultrastructure/multimer analysis","pmids":["32614949"],"confidence":"High","gaps":["How exocyst simultaneously promotes maturation and clamps release mechanistically unresolved","Endosomal cargo delivered to WPBs not enumerated"]},{"year":2021,"claim":"Demonstrated that endothelial VWF drives thromboinflammation across distinct disease settings (sickle cell vaso-occlusion, TBI, venous thrombosis) and identified the A1 LRP1-clearance cluster and the GPIbα cytoplasmic tail signaling requirement.","evidence":"endothelial-specific VWF KO in SCD mice with ADAMTS13 rescue, A2-protein blocking in TBI, PTP1B-KO/SNAP23 phosphorylation studies, K1405-K1408 mutagenesis with in vivo clearance, and CRISPR GPIbα tail-deletion platelets","pmids":["35969769","33507292","38563147","38996211","34134470","26209660","22712744"],"confidence":"High","gaps":["Therapeutic windows of A2-domain blockade in humans untested","Cross-talk between clearance and thromboinflammatory roles not integrated"]},{"year":2022,"claim":"Extended VWF function beyond hemostasis to vascular remodeling, showing A2-domain binding to LRP4/αvβ3 drives smooth muscle cell proliferation and neointimal hyperplasia.","evidence":"siRNA against αv and LRP4, RAP inhibition, proximity ligation/Co-IP, and VWF-KO mouse injury models","pmids":["33576766"],"confidence":"High","gaps":["Signaling downstream of αvβ3 in VSMCs not delineated","Whether circulating versus locally secreted VWF mediates this not resolved"]},{"year":null,"claim":"How VWF transcriptional induction (by GATA factors, HMGB1-TLR2-SP1, hyperglycemia) and pathogen/leukocyte interactions (S. aureus ClfA, SLC44A2 neutrophils) integrate with the secretion-cleavage-clearance axis to set VWF function in disease remains open.","evidence":"","pmids":[],"confidence":"Low","gaps":["Transcriptional regulators identified largely in single-lab, context-specific models","Integration of bacterial and leukocyte adhesion roles with hemostatic functions not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[4,11,17,35]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9,17]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,5,6,24]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[3,9,20,34]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[10,17]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[7,11,16,23]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[33,34]}],"pathway":[{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[4,7,11,28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5,6,24]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[9,14,20,25]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21,32,35]}],"complexes":["Weibel-Palade body","VWF-FVIII complex"],"partners":["ADAMTS13","GP1BA","VIM","LRP1","STAB2","CLEC4M","LRP4","THBS1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04275","full_name":"von Willebrand factor","aliases":[],"length_aa":2813,"mass_kda":309.3,"function":"Important in the maintenance of hemostasis, it promotes adhesion of platelets to the sites of vascular injury by forming a molecular bridge between sub-endothelial collagen matrix and platelet-surface receptor complex GPIb-IX-V. Also acts as a chaperone for coagulation factor VIII, delivering it to the site of injury, stabilizing its heterodimeric structure and protecting it from premature clearance from plasma","subcellular_location":"Secreted; Secreted, extracellular space, extracellular matrix","url":"https://www.uniprot.org/uniprotkb/P04275/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VWF","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/VWF","total_profiled":1310},"omim":[{"mim_id":"621107","title":"HEMICENTIN 2; HMCN2","url":"https://www.omim.org/entry/621107"},{"mim_id":"620865","title":"EHLERS-DANLOS SYNDROME, CLASSIC-LIKE, 3; EDSCLL3","url":"https://www.omim.org/entry/620865"},{"mim_id":"620776","title":"THROMBOCYTOPENIA 13, SYNDROMIC; THC13","url":"https://www.omim.org/entry/620776"},{"mim_id":"620715","title":"BLEEDING DISORDER, VASCULAR-TYPE; BDVAS","url":"https://www.omim.org/entry/620715"},{"mim_id":"620144","title":"CACHE DOMAIN-CONTAINING PROTEIN 1; CACHD1","url":"https://www.omim.org/entry/620144"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VWF"},"hgnc":{"alias_symbol":[],"prev_symbol":["F8VWF"]},"alphafold":{"accession":"P04275","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P04275","model_url":"https://alphafold.ebi.ac.uk/files/AF-P04275-2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P04275-2-F1-predicted_aligned_error_v6.png","plddt_mean":75.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VWF","jax_strain_url":"https://www.jax.org/strain/search?query=VWF"},"sequence":{"accession":"P04275","fasta_url":"https://rest.uniprot.org/uniprotkb/P04275.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P04275/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P04275"}},"corpus_meta":[{"pmid":"3874428","id":"PMC_3874428","title":"Human von Willebrand factor (vWF): isolation of complementary DNA (cDNA) clones and chromosomal localization.","date":"1985","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/3874428","citation_count":417,"is_preprint":false},{"pmid":"3019665","id":"PMC_3019665","title":"Full-length von Willebrand factor (vWF) cDNA encodes a highly repetitive protein considerably larger than the mature vWF subunit.","date":"1986","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/3019665","citation_count":241,"is_preprint":false},{"pmid":"12009786","id":"PMC_12009786","title":"Expression of the endothelial markers PECAM-1, vWf, and CD34 in vivo and in vitro.","date":"2002","source":"Experimental and molecular pathology","url":"https://pubmed.ncbi.nlm.nih.gov/12009786","citation_count":189,"is_preprint":false},{"pmid":"17901248","id":"PMC_17901248","title":"Platelet-VWF complexes are preferred substrates of ADAMTS13 under fluid shear 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\"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — foundational cDNA cloning with chromosomal localization, replicated across the field\",\n      \"pmids\": [\"3874428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"Full-length VWF cDNA encodes a 2813-aa pre-pro-protein with a highly repetitive domain structure (D1-D2-D'-D3-A1-A2-A3-D4-B1-B2-C1-C2), including a 741-aa propeptide (equivalent to von Willebrand Antigen II) and a 2050-aa mature subunit; in-vitro expression confirmed synthesis of the unglycosylated precursor.\",\n      \"method\": \"Full-length cDNA assembly, in vitro expression in mammalian cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — complete coding sequence determination with in vitro expression validation, foundational and widely replicated\",\n      \"pmids\": [\"3019665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"The VWF propeptide (domains D1-D2) is required for multimerization beyond the dimer stage but not for dimerization itself; COS-1 cells expressing propeptide-deleted VWF assembled only dimers, not higher multimers.\",\n      \"method\": \"Heterologous expression of wild-type and propeptide-deleted VWF cDNA in COS-1 cells, multimer analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution by mutagenesis/expression with clear functional readout; replicated by later studies\",\n      \"pmids\": [\"3500851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"VWF is both necessary and sufficient for Weibel-Palade body (WPB) formation in endothelial cells: VWD (VWF-null) canine aortic endothelial cells lacked WPBs, and re-expression of wild-type VWF restored WPBs that recruited endogenous P-selectin. VWF multimerization is not required for WPB creation, but the VWF propeptide alone cannot independently form WPBs.\",\n      \"method\": \"Expression of wild-type and mutant VWF in VWF-null canine endothelial cells; confocal immunostaining for P-selectin, VWFpp, and VWF\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function (VWF-null cells) plus rescue experiments with multiple VWF constructs, orthogonal readouts\",\n      \"pmids\": [\"15331450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"VWF binding to platelet GPIb-IX initiates a signaling cascade (Lyn → Src → Syk → SLP-76 → PI3K → PLCγ2 → PKC) leading to thromboxane A2 (TXA2) production, which is required for αIIbβ3 activation and platelet aggregation. LAT and FcRγ-chain are not required for TXA2 production but are required for granule secretion and aggregation.\",\n      \"method\": \"Mouse platelets genetically deficient in Lyn, Src, Syk, SLP-76, PLCγ2, LAT, or FcRγ-chain; wortmannin inhibition; botrocetin/VWF stimulation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple individual knockout lines plus pharmacological inhibitors establishing pathway order\",\n      \"pmids\": [\"15985541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"VWF/GPIb-induced platelet aggregation requires Src family kinase- and ERK-mediated TXA2 generation; Erk2 phosphorylation and TXA2 release were abolished by the Src inhibitor PP2 and the PLC inhibitor U73122, and MEK inhibition (U0126) abolished VWF-induced aggregation in non-aspirin-treated platelets.\",\n      \"method\": \"Pharmacological inhibition (PP2, U73122, U0126, aspirin) in washed human platelets stimulated with VWF/ristocetin; Erk2 phosphorylation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal pharmacological inhibitors defining pathway hierarchy, single lab\",\n      \"pmids\": [\"16020504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Bruton tyrosine kinase (Btk) is essential for VWF/GPIb-induced TXA2 production and GPIb-dependent arterial thrombus formation in vivo; Btk acts downstream of Lyn, Syk, SLP-76, and PI3K and upstream of ERK1/2, PLCγ2, and PKC in the signaling cascade.\",\n      \"method\": \"Btk-deficient mouse platelets; botrocetin/VWF stimulation; ferric chloride carotid artery thrombosis model; pharmacological epistasis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus in vivo thrombosis model, pathway placement by genetic and pharmacological epistasis\",\n      \"pmids\": [\"16788103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ADAMTS13 preferentially cleaves platelet-VWF complexes under fluid shear stress rather than soluble VWF alone; platelet-dependent cleavage was blocked by anti-GPIbα antibody or soluble GPIbα fragment, and consumed large VWF multimers selectively.\",\n      \"method\": \"Cone-plate viscometer shear assay; anti-GPIbα blocking; multimeric gel analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical reconstitution with specific blocking reagents and multimer readout, single lab with orthogonal approaches\",\n      \"pmids\": [\"17901248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"N-linked glycans on VWF modulate its susceptibility to ADAMTS13 cleavage; removal of N-linked glycans (PNGaseF) increased ADAMTS13 affinity ~4-fold and allowed cleavage without denaturant. Specific mutation of N1574 (not N1515) increased ADAMTS13 proteolysis and allowed cleavage in the absence of urea, at least partly through a conformational mechanism.\",\n      \"method\": \"PNGaseF deglycosylation; site-directed mutagenesis of N1515 and N1574; surface plasmon resonance; ADAMTS13 cleavage assays with recombinant VWF and isolated VWF-A2 domain\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with site-directed mutagenesis and multiple binding/cleavage assays, single lab\",\n      \"pmids\": [\"17975018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Rab27a and its effector MyRIP localize to mature Weibel-Palade bodies and anchor them to peripheral actin; siRNA depletion of either protein caused loss of peripheral WPB localization, increased basal and stimulated VWF secretion, and release of less-multimerized VWF, resulting in shorter VWF strings under flow.\",\n      \"method\": \"siRNA depletion in primary human endothelial cells; live imaging; VWF multimer analysis; flow-based string assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with multiple orthogonal readouts (localization, secretion, multimer size, string length) in primary cells\",\n      \"pmids\": [\"19270261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Endothelial ADAMTS13 is released constitutively from the Golgi to the cell exterior without storage organelle, and cleaves secreted and cell-anchored VWF strings at Y1605-M1606 progressively; blocking different ADAMTS13 domains with antibodies revealed ADAMTS13 attachment along the length of VWF strings.\",\n      \"method\": \"HUVEC culture under static conditions; ADAMTS13 mRNA quantification; anti-ADAMTS13 domain antibody blockade; VWF string cleavage assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based mechanistic study with antibody domain mapping and quantitative cleavage assays, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"19822897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The VWF propeptide (VWFpp) binds to the D'D3 domain of mature VWF with high affinity (KD = 0.2 nM at pH 6.2/10 mM Ca2+) and weaker but significant affinity under physiologic conditions (KD = 25 nM); this interaction in the circulation attenuates platelet adhesion and GpIbα-binding activity of VWF.\",\n      \"method\": \"Surface plasmon resonance; development of anti-VWF D'D3 monoclonal antibodies; flow chamber platelet adhesion assays; shear-induced platelet aggregation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative binding kinetics by SPR, functional blockade by domain-specific antibodies, multiple orthogonal assays in one study\",\n      \"pmids\": [\"22452980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Thrombospondin-1 (TSP1) binds to VWF A2 and A3 domains and competitively inhibits ADAMTS13 binding and cleavage activity by up to 70%, providing a mechanism by which TSP1 protects VWF from ADAMTS13 proteolysis.\",\n      \"method\": \"ELISA-based binding assays with recombinant VWF domains (A1, A2, A3) and full-length VWF; Western blot and residual collagen-binding assay for ADAMTS13 activity inhibition\",\n      \"journal\": \"Thrombosis research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — solid-phase binding and activity assays, single lab, limited to in vitro biochemistry\",\n      \"pmids\": [\"20705333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A homozygous N528S mutation in the VWF propeptide D2 domain introduces an ectopic N-glycosylation site near a disulfide isomerase consensus sequence, causing defective multimerization and failure of VWF trafficking to storage granules; wild-type propeptide alone trafficked normally, demonstrating that the defect is in mature VWF transport by its mutant propeptide.\",\n      \"method\": \"Patient phenotyping; heterologous mammalian cell expression of N528S-VWF; immunostaining; multimer analysis; propeptide trafficking assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — disease mutation with reconstituted expression, multiple functional and localization readouts in one study\",\n      \"pmids\": [\"20335223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gα12 and α-SNAP are obligatory mediators of both basal and thrombin-evoked VWF secretion from endothelial cells; Gα12 N-terminal residues 10-15 bind α-SNAP, and an α-SNAP binding-domain minigene peptide blocked both basal and evoked VWF secretion. Gαq/RhoA/p115-RhoGEF contribute to evoked but not basal VWF secretion.\",\n      \"method\": \"EC-specific Gα12/Gα13 knockout mice; siRNA knockdown in HUVECs; in vitro binding assays; overexpression of activated Gα12; isolated buffer-perfused mouse lungs\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mice + siRNA + binding assays + peptide inhibition across multiple orthogonal approaches\",\n      \"pmids\": [\"24081657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Shear-induced unfolding of the VWF A2 domain permits ADAMTS13 cleavage of full-length VWF multimers; enzymatic rate shows a sigmoidal increase with shear rate (threshold γ̇1/2 = 5522/s) as measured in real time by fluorescence correlation spectroscopy, consistent with Brownian hydrodynamics simulations.\",\n      \"method\": \"Fluorescence correlation spectroscopy; microfluidic shear cell; multimer gel analysis; Michaelis-Menten kinetics under denaturing conditions; Brownian hydrodynamics simulations\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative in vitro reconstitution with real-time single-molecule readout and computational validation, single study\",\n      \"pmids\": [\"26840720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Stabilin-2 on sinusoidal endothelial cells binds and internalizes VWF and FVIII in a VWF-dependent manner; stabilin-2-deficient mice showed prolonged VWF-FVIII half-life and decreased immune response to human VWF-FVIII complex, establishing stabilin-2 as a clearance and immunoregulatory receptor for the VWF-FVIII complex.\",\n      \"method\": \"Cell-based binding/internalization assays; stabilin-2 KO mice; pharmacokinetic infusion studies; immunogenic response quantification; heterologous expression of stabilin-2 variant p.E2377K\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro mechanistic studies corroborated by in vivo KO mouse pharmacokinetics and immunogenicity data, multiple orthogonal methods\",\n      \"pmids\": [\"30124466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Extracellular vimentin on the endothelial surface tethers VWF strings via interaction with the VWF A2 domain; VWF string formation was reduced in vimentin-KO arteries and by treatment with recombinant A2 domain protein or anti-vimentin antibody; A2 protein improved cortical reperfusion after experimental stroke.\",\n      \"method\": \"Pressurized cerebral artery preparations; Vim-KO mice; recombinant A2 protein and antibody blocking; laser speckle contrast imaging; middle cerebral artery occlusion mouse model\",\n      \"journal\": \"Stroke\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, recombinant protein blocking, and antibody blocking converging on the same interaction, validated in vivo\",\n      \"pmids\": [\"30355099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Extracellular PAD4 citrullinates ADAMTS13 on specific arginine residues, dramatically inhibiting its enzymatic activity; this leads to accumulation of VWF-platelet strings in vivo, accelerates thrombus formation after vessel injury, and can be reversed by injection of non-citrullinated recombinant ADAMTS13.\",\n      \"method\": \"Mass spectrometry identification of citrullination sites; in vitro ADAMTS13 activity assays; r-huPAD4 injection in mice; intravital microscopy of VWF-platelet strings; ferric chloride thrombosis model; patient plasma citrullination measurements\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry + in vitro enzymatic assay + in vivo mouse models + patient validation, multiple orthogonal methods\",\n      \"pmids\": [\"31248335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CLEC4M on liver sinusoidal endothelial cells binds and internalizes FVIII through VWF-dependent and VWF-independent mechanisms; VWF-independent binding is mediated by mannose-exposed N-linked glycans on FVIII and involves clathrin-coated pit endocytosis for lysosomal catabolism.\",\n      \"method\": \"Cell-based binding/internalization assays in CLEC4M-expressing HEK293 cells; solid-phase binding assays; in vivo hydrodynamic liver transfer; immunohistochemistry\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vitro assays plus in vivo validation with mechanistic dissection of VWF-dependent vs. independent pathways\",\n      \"pmids\": [\"30740857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BLOC-2 and the exocyst complex cooperate in WPB biogenesis by mediating endosomal input required for VWF maturation into high-molecular-weight multimers; BLOC-2 depletion impairs WPB exocytosis, whereas exocyst depletion paradoxically augments exocytosis, identifying exocyst as a clamp on VWF release separable from its role in VWF maturation.\",\n      \"method\": \"siRNA depletion; immunoprecipitation of BLOC-2; small-molecule exocyst inhibitor (Endosidin2); WPB ultrastructure analysis; VWF multimer analysis of releasates\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identification of BLOC-2/exocyst complex, siRNA and chemical inhibition, multiple functional readouts, single study\",\n      \"pmids\": [\"32614949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Endothelial VWF is critical for vaso-occlusion in sickle cell disease; endothelial-specific VWF deletion reduced hemolysis, vascular occlusion, and organ damage in TNF-induced VOE in humanized SCD mice, and ADAMTS13 administration reduced plasma VWF and attenuated inflammation and vaso-occlusion.\",\n      \"method\": \"Endothelial-specific VWF knockout mice crossed to humanized SCD mice; ADAMTS13 infusion; measurement of hemolysis, vascular occlusion, organ damage\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional endothelial KO plus ADAMTS13 rescue in a disease model, multiple mechanistic readouts\",\n      \"pmids\": [\"35969769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Conformation-dependent hyperadhesive VWF with an exposed A1 domain is released acutely after traumatic brain injury and can be selectively blocked by a recombinant VWF A2-domain protein (A2), which reduced TBI-induced death by >50%, protected the endothelium from extracellular vesicle-induced injury, and prevented consumptive coagulopathy by blocking the exposed A1 domain.\",\n      \"method\": \"Recombinant VWF A2-domain protein infusion in mice with lateral fluid percussion TBI; measurement of platelet activation, microvesiculation, coagulation parameters, neurological function; endothelial protection assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function by domain-specific blocking protein with multiple mechanistic readouts, single study\",\n      \"pmids\": [\"33507292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The VWF A1 domain contains a conserved cluster of four lysine residues (K1405-K1408) that mediates binding to macrophage LRP1 clusters II and IV; alanine mutagenesis of this cluster attenuated VWF binding to LRP1 and significantly reduced in vivo VWF clearance, establishing LRP1-mediated macrophage clearance as a physiologically relevant VWF degradation pathway.\",\n      \"method\": \"Alanine mutagenesis of K1405-K1408; binding assays with LRP1 clusters II and IV and HEK-LRP1 cells; in vivo clearance of VWF-4A mutant; BT200 (rondaptivon pegol) competition assays; macrophage galactose lectin and SR-AI binding assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-directed mutagenesis with in vitro binding assays and in vivo clearance validation, multiple receptor systems interrogated\",\n      \"pmids\": [\"38996211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"VWF mediates vascular smooth muscle cell (VSMC) proliferation and migration through binding of the VWF A2 domain to LRP4, which signals through αvβ3 integrin; siRNA against αv integrin or LRP4, and LRP inhibitor RAP, abolished proliferation; proximity ligation and immunoprecipitation confirmed LRP4-αvβ3 co-association. VWF-deficient mice showed reduced neointimal hyperplasia in carotid ligation and femoral denudation models.\",\n      \"method\": \"siRNA knockdown of αv integrin and LRP4; LRP inhibitor (RAP); confocal fluorescence microscopy; proximity ligation assay; immunoprecipitation; VWF-deficient mouse carotid and femoral injury models\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple siRNA knockdowns, co-IP, in vivo VWF-KO models, and domain-specific identification of A2 as the binding region\",\n      \"pmids\": [\"33576766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Endothelial PTP1B deletion promotes VWF exocytosis by reducing PTP1B-mediated tyrosine dephosphorylation of SNAP23; increased SNAP23 phosphorylation enhances Weibel-Palade body membrane fusion and VWF release, which in turn drives neutrophil adhesion and venous thromboinflammation.\",\n      \"method\": \"Inducible endothelial PTP1B KO mice; inferior vena cava ligation thrombosis model; primary endothelial cell mechanistic studies; SNAP23 phosphorylation assays; VWF-blocking antibodies; intravital microscopy\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mice, molecular mechanism (SNAP23 phosphorylation) identified, multiple in vivo and in vitro orthogonal methods\",\n      \"pmids\": [\"38563147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"VWF interaction with GPIb-IX-V activates two distinct tyrosine kinase pathways in platelets: Pyk2 phosphorylation is independent of calcium mobilization and PKC but downstream of Syk, whereas FAK phosphorylation requires TXA2, αIIbβ3, calcium, and PKC; both kinases require actin polymerization and translocate to the cytoskeleton.\",\n      \"method\": \"Human platelet stimulation with vWF; inhibitors of TxA2, calcium chelation, PKC, Syk (piceatannol), cytochalasin D; RGDS peptide; FAK and Pyk2 phosphorylation immunoblotting\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors defining pathway hierarchy, single lab, human platelet biochemistry\",\n      \"pmids\": [\"11916084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In botrocetin/VWF-stimulated washed platelets, GPIbα-mediated agglutination produces TXA2 via calcium-independent PKC and PLA2 activities; TXA2 causes dense granule secretion and, together with ADP, is required for αIIbβ3 activation and aggregation; α-granule secretion requires ADP signaling through P2Y1 then P2Y12.\",\n      \"method\": \"Mouse platelets deficient in TXA2 receptors, Gαq, or αIIbβ3; pharmacological inhibitors; botrocetin/VWF stimulation; granule secretion and aggregation assays\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic knockouts plus inhibitors in one study, single lab\",\n      \"pmids\": [\"15613029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Platelet-derived VWF is not required for normal hemostasis or arterial thrombosis, but aggravates ischemic stroke injury via a GPIb-dependent mechanism; platelet VWF blockade with anti-GPIb antibody reduced cerebral infarct size in chimeric mice carrying only platelet VWF.\",\n      \"method\": \"Bone marrow transplantation between C57BL/6J and Vwf−/− mice to generate platelet-VWF-specific chimeras; tail bleeding, carotid thrombosis, and middle cerebral artery occlusion models; GPIb-blocking antibody\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific chimeric KO models combined with pharmacological blockade and multiple in vivo functional readouts\",\n      \"pmids\": [\"26209660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Vps33b facilitates VWF-positive vesicular trafficking in megakaryocytes to α-granule vacuoles; HSC-specific Vps33b deletion abolished α-granules in platelets and megakaryocytes, and disrupted co-localization of Sec22b with Vwf-positive vesicles; Vps33b associates with VIPAS39, α-tubulin, and SEC22B.\",\n      \"method\": \"Tamoxifen-inducible HSC-specific Vps33b KO mice; co-immunoprecipitation; mass spectrometry; immunoblotting; pull-down assays; confocal microscopy of proplatelet Vwf-positive vesicles\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with Co-IP identification of binding partners and localization studies, single lab\",\n      \"pmids\": [\"27319744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SARS-CoV-2 spike protein S1 RBD induces endothelial VWF secretion through ACE2 in an ARF6 activation-dependent manner; pharmacological inhibitor studies defined a downstream signaling cascade from ACE2 to VWF exocytosis.\",\n      \"method\": \"In vitro endothelial cell stimulation with S1 RBD; pharmacological inhibitors of ACE2 signaling pathway components; ARF6 activation assay; VWF secretion measurement\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro pharmacological pathway dissection, single lab, abstract-level detail on specific inhibitors\",\n      \"pmids\": [\"36982738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The GPIbα intracellular tail (last 24 residues containing 14-3-3 and PI3K binding sites) is required for VWF-dependent platelet signaling and GPVI-mediated signaling; GPIbαΔsig/Δsig platelets bound VWF normally but formed fewer filopodia, had decreased Syk phosphorylation and αIIbβ3 activation upon CRP stimulation, and formed smaller aggregates on collagen under shear.\",\n      \"method\": \"CRISPR-Cas9 GPIbα intracellular tail deletion mouse; flow-based platelet adhesion and aggregation assays; intracellular signaling (pSyk) assays; collagen microchannel aggregation at multiple shear rates\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-generated mouse model with multiple orthogonal functional and signaling readouts, single study\",\n      \"pmids\": [\"34134470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Increased inflammation in ADAMTS13-deficient mice after ischemic stroke is VWF-dependent: double-deficient (ADAMTS13−/−;VWF−/−) mice had the same reduced inflammation as VWF−/− mice alone, demonstrating that ADAMTS13 limits brain injury by reducing VWF-mediated neutrophil infiltration and cytokine production.\",\n      \"method\": \"ADAMTS13−/−, VWF−/−, and double-KO mice; transient middle cerebral artery occlusion; MPO activity; immunohistochemistry for neutrophils; cytokine quantification; neutrophil depletion\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using three genotypes plus neutrophil depletion experiment establishing VWF as the downstream effector\",\n      \"pmids\": [\"22712744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In porcine aortic endothelial cells lacking Weibel-Palade bodies, VWF propeptide traffics to the Golgi (cycling between stacked Golgi and earlier compartments) but mature VWF does not form WPBs and is not acutely released, demonstrating that VWF propeptide and mature VWF have divergent intracellular trafficking when WPBs are absent.\",\n      \"method\": \"RT-PCR; Western blot; immunostaining with Golgi marker; stimulated secretion assays in porcine and human aortic endothelial cells\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — comparative cell biology in primary cells with multiple markers, single lab, no functional rescue\",\n      \"pmids\": [\"12618268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Expression of pro-VWF cDNA in VWF-negative ECV304 endothelial cells restored Weibel-Palade body formation and directed tissue-type plasminogen activator (t-PA) into these granules, demonstrating that VWF expression is sufficient to form functional secretory WPBs and that t-PA is co-stored with VWF in WPBs.\",\n      \"method\": \"Stable transfection of pro-VWF cDNA into ECV304 cells; immunostaining; stimulated secretion with calcium ionophore A23187; t-PA storage assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reconstitution of WPBs in VWF-null cells with functional secretion readout, single lab\",\n      \"pmids\": [\"10634936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Slc44a2/HNA-3a expression on neutrophils mediates their adhesion to VWF under venous shear rates (100 s−1) independently of β2 integrin; HNA-3b-expressing neutrophils have impaired VWF adhesion; Slc44a2-KO mice show massively reduced neutrophil recruitment in inflamed mesenteric venules after endothelial degranulation.\",\n      \"method\": \"Flow chamber adhesion assays with transfected HEK293T cells or donor neutrophils; β2 integrin blocking; LPS preactivation; intravital microscopy in SLC44A2-KO mice after histamine stimulation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro flow assays with genetic variants plus in vivo KO mouse intravital microscopy, multiple orthogonal approaches\",\n      \"pmids\": [\"33556175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A single amino acid substitution R2657Q in the VWF protein (encoded by SNP +7970G>A in the CASA/RkJ Vwf allele) confers significantly increased VWF biosynthesis in vitro and elevated plasma VWF in vivo, representing a gain-of-function natural variant.\",\n      \"method\": \"In vitro recombinant VWF expression comparing A/J and CASA/RkJ alleles; SNP identification; quantitative biosynthesis assays; in vivo plasma VWF measurement in congenic mice\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — recombinant protein expression plus in vivo mouse validation with single causative SNP identified\",\n      \"pmids\": [\"16873672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Two common VWF SNVs, rs1063856 (c.2365A>G) and rs1063857 (c.2385T>C), independently increase plasma VWF levels by prolonging VWF mRNA half-life (increased biosynthesis) and by reducing in vivo VWF clearance (lower VWFpp/VWF:Ag ratio; longer VWF half-life in Vwf-KO mice infused with recombinant VWF).\",\n      \"method\": \"Genotypic/phenotypic analysis in European controls; recombinant VWF expression in vitro; mRNA stability assays; in vivo pharmacokinetics in Vwf-KO mice\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — combined in vitro mRNA stability, in vitro recombinant protein assays, and in vivo mouse clearance studies providing mechanistic explanation\",\n      \"pmids\": [\"29980574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hyperglycemia-induced oxidative stress in endothelial cells upregulates VWF expression through the transcription factor GATA1, which drives vWF-mediated adhesion of tumor cells to the endothelium and promotes transendothelial migration and lung metastasis.\",\n      \"method\": \"STZ-induced hyperglycemia mouse model; primary lung EC gene expression; siRNA knockdown of vWF; chromatin immunoprecipitation for GATA1 on the vWF promoter; tumor adhesion and transendothelial migration assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishing GATA1 binding to vWF promoter, siRNA knockdown, in vivo mouse model, single lab\",\n      \"pmids\": [\"35094008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GATA3 mediates upregulation of VWF transcription in lung adenocarcinoma tumor vasculature; conditioned media from A549 cancer cells increased vWF expression in HUVECs, and ChIP assays confirmed direct GATA3 binding to the +220 GATA binding motif on the human VWF promoter.\",\n      \"method\": \"Co-culture conditioned media system; ChIP assay; siRNA knockdown of GATA3 and ERG; immunohistochemistry of tumor microarrays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishing direct transcription factor-promoter interaction plus functional siRNA validation, single lab\",\n      \"pmids\": [\"29299165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hypoxia-induced HMGB1 upregulates vWF expression through a TLR2-MYD88-SP1 signaling pathway; TLR2 silencing abolished MYD88 expression, vWF expression, and SP1 phosphorylation, and blocked Sp1 binding to the Vwf promoter.\",\n      \"method\": \"Murine acute hypoxia model; TLR2 agonist/neutralizing antibody; HMGB1 inhibitor; Tlr2 siRNA silencing; SP1 inhibitor; promoter binding assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic silencing plus pharmacological inhibition establishing pathway order, with promoter binding evidence, single lab\",\n      \"pmids\": [\"27480067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Staphylococcus aureus ClfA interacts with VWF via vWF-binding protein (vWbp) to form an ultra-strong ternary complex (~2000 pN); force spectroscopy showed that vWbp activates a direct, dock-lock-and-latch-type ClfA–VWF interaction, representing a mechanism of bacterial exploitation of VWF for adhesion.\",\n      \"method\": \"Atomic force microscopy–based single-molecule force spectroscopy on living bacteria; recombinant protein binding experiments\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — single-molecule force spectroscopy with structural mechanism identified, single lab, no complementary biochemical validation beyond force measurements\",\n      \"pmids\": [\"33846500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hagfish (Myxine glutinosa) possess a functional Vwf gene encoding a simpler protein than gnathostome VWF that notably lacks an A3 domain (collagen-binding domain present only in jawed vertebrates); hagfish Vwf forms high-molecular-weight multimers in plasma and CHO cells, and botrocetin promotes VWF-dependent thrombocyte aggregation, establishing VWF as originating in the ancestral vertebrate after divergence from urochordates.\",\n      \"method\": \"Genomic identification; stable CHO cell expression; multimer analysis; botrocetin-induced aggregation assays; immunohistochemistry; electron microscopy for Weibel-Palade bodies\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — recombinant expression, functional aggregation assay, and ultrastructural evidence in a single evolutionary study\",\n      \"pmids\": [\"28899852\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VWF is a large multimeric glycoprotein synthesized in endothelial cells and megakaryocytes as a pre-pro-protein whose propeptide (D1-D2 domains) is obligatory for multimerization beyond dimers and for Weibel-Palade body (WPB) biogenesis; mature VWF stored in WPBs is released constitutively and in a regulated manner controlled by Gα12/α-SNAP (basal and evoked) and Gαq/RhoA (evoked), with Rab27a/MyRIP anchoring mature WPBs to peripheral actin to prevent premature release, and BLOC-2/exocyst regulating endosomal input during VWF maturation and clamping exocytosis; upon secretion, VWF strings are tethered to the endothelial surface through an interaction between the VWF A2 domain and extracellular vimentin, and are cleaved at Y1605-M1606 by ADAMTS13 in a shear-force-dependent manner that requires unfolding of the A2 domain (regulated by N1574 glycosylation), with platelet-VWF complexes being preferred substrates; VWF binds platelet GPIbα via its A1 domain to initiate signaling through Lyn→Src→Syk→SLP-76→PI3K→Btk→ERK/PLCγ2→PKC→TXA2 leading to αIIbβ3 activation, while the GPIbα intracellular tail transduces both VWF- and collagen/GPVI-mediated signals; circulating VWFpp remains non-covalently bound to mature VWF at the D′D3 domain to attenuate platelet adhesion; plasma clearance of the VWF-FVIII complex is mediated by sinusoidal endothelial receptors stabilin-2, CLEC4M (via mannose glycans on FVIII), and LRP1 on macrophages (via K1405-K1408 in the A1 domain); VWF also mediates vascular smooth muscle cell proliferation via A2-domain binding to LRP4 and αvβ3 signaling, and endothelial PTP1B normally suppresses VWF exocytosis by dephosphorylating SNAP23.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VWF is a large, endothelial- and megakaryocyte-derived multimeric glycoprotein that links primary hemostasis to platelet adhesion, thrombus formation, and vascular inflammation [#0, #4]. It is synthesized as a 2813-aa pre-pro-protein with a repetitive domain architecture (D1-D2-D'-D3-A1-A2-A3-D4-B1-B2-C1-C2), whose D1-D2 propeptide is obligatory for assembly of dimers into higher-order multimers, while dimerization itself is propeptide-independent [#1, #2]. VWF expression is both necessary and sufficient to drive biogenesis of Weibel-Palade bodies (WPBs), the endothelial storage granules into which it recruits cargo such as P-selectin and t-PA; multimerization is dispensable for WPB formation but propeptide-directed trafficking of mature VWF is required, and a propeptide D2-domain mutation (N528S) that introduces an ectopic glycan abolishes multimerization and storage [#3, #13, #34]. WPB exocytosis is tightly gated: Gα12/α-SNAP mediate both basal and evoked secretion while Gαq/RhoA contribute to evoked release, Rab27a/MyRIP anchor mature WPBs to peripheral actin to restrain premature secretion, BLOC-2/exocyst control endosomal input and clamp release, and endothelial PTP1B suppresses exocytosis by dephosphorylating SNAP23 [#9, #14, #20, #25]. Once secreted, VWF strings are tethered to the endothelial surface through an A2-domain interaction with extracellular vimentin and are size-regulated by ADAMTS13, which cleaves the A2 domain at Y1605-M1606 in a shear-dependent manner requiring A2 unfolding (modulated by N1574 glycosylation), preferentially processing platelet-bound multimers [#7, #8, #10, #15, #17]. The VWF A1 domain engages platelet GPIbα to initiate a Lyn\\u2192Src\\u2192Syk\\u2192SLP-76\\u2192PI3K\\u2192Btk\\u2192ERK/PLCγ2\\u2192PKC cascade culminating in thromboxane A2 generation and αIIbβ3 activation [#4, #5, #6]. The circulating VWF propeptide remains non-covalently bound to the D'D3 domain of mature VWF and attenuates GPIbα-dependent platelet adhesion [#11]. Plasma clearance of VWF and its associated FVIII is governed by sinusoidal stabilin-2 and CLEC4M and by macrophage LRP1 binding to a K1405-K1408 cluster in the A1 domain [#16, #19, #23]. Beyond hemostasis, VWF promotes vascular smooth muscle cell proliferation via A2-domain binding to LRP4/αvβ3 signaling and drives thromboinflammation in ischemic stroke, sickle cell vaso-occlusion, traumatic brain injury, and venous thrombosis [#21, #22, #24, #32].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Establishing the complete VWF coding sequence and domain architecture defined the modular protein from which all subsequent structure-function dissection proceeded.\",\n      \"evidence\": \"full-length cDNA assembly and in vitro expression of the precursor in mammalian cells\",\n      \"pmids\": [\"3019665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how individual domains map to specific binding partners\", \"Glycosylation and multimer assembly not addressed\"]\n    },\n    {\n      \"year\": 1987,\n      \"claim\": \"Resolved whether the propeptide is needed for assembly, showing it is obligatory for multimerization beyond dimers but not for dimerization itself.\",\n      \"evidence\": \"heterologous expression of propeptide-deleted VWF in COS-1 cells with multimer analysis\",\n      \"pmids\": [\"3500851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which the propeptide catalyzes inter-dimer disulfide bonding not defined\", \"Did not address storage granule formation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Determined that VWF itself drives the biogenesis of its storage organelle, resolving whether WPBs require a dedicated scaffold or VWF alone.\",\n      \"evidence\": \"loss-of-function in VWF-null canine endothelial cells plus rescue with VWF constructs and orthogonal P-selectin/VWFpp readouts\",\n      \"pmids\": [\"15331450\", \"10634936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery directing VWF to WPBs not identified here\", \"Why propeptide alone is insufficient unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the platelet GPIb-IX signaling cascade triggered by VWF engagement, establishing the kinase hierarchy ending in TXA2-dependent integrin activation.\",\n      \"evidence\": \"genetic knockout platelet lines (Lyn, Src, Syk, SLP-76, PLCγ2, Btk) plus pharmacological epistasis and an in vivo thrombosis model\",\n      \"pmids\": [\"15985541\", \"16020504\", \"16788103\", \"11916084\", \"15613029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How A1-GPIbα binding mechanically couples to Lyn activation not resolved\", \"Quantitative thresholds linking shear to signaling not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed that ADAMTS13 cleavage is conformationally and substrate-state regulated, preferentially processing shear-unfolded, platelet-bound VWF.\",\n      \"evidence\": \"cone-plate shear assay with anti-GPIbα blockade, deglycosylation, N1574 mutagenesis, SPR, and A2-domain cleavage assays\",\n      \"pmids\": [\"17901248\", \"17975018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution of N1574 glycosylation to multimer size unquantified\", \"Structural basis of glycan-modulated unfolding not solved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined how secreted ADAMTS13 reaches and progressively cleaves cell-anchored VWF strings, and showed Rab27a/MyRIP anchoring controls multimer size of released VWF.\",\n      \"evidence\": \"HUVEC string cleavage with ADAMTS13 domain-antibody blockade and siRNA depletion of Rab27a/MyRIP with flow-based string assays\",\n      \"pmids\": [\"19822897\", \"19270261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial regulation of constitutive ADAMTS13 release not fully defined\", \"Link between actin anchoring and multimer maturation incompletely mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established that the cleaved propeptide remains a functional regulator, binding D'D3 to attenuate platelet adhesion, and identified disease-relevant trafficking defects.\",\n      \"evidence\": \"SPR binding kinetics, domain-specific antibodies, flow chamber adhesion assays, and expression of the N528S propeptide mutant\",\n      \"pmids\": [\"22452980\", \"20335223\", \"20705333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological extent of propeptide-mediated suppression in vivo unquantified\", \"TSP1 competition with ADAMTS13 limited to in vitro biochemistry\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified the G-protein machinery distinguishing basal from evoked WPB exocytosis, with Gα12/α-SNAP obligatory for both and Gαq/RhoA selective for evoked release.\",\n      \"evidence\": \"EC-specific Gα12/13 KO mice, HUVEC siRNA, in vitro binding assays, and inhibitory minigene peptide in perfused lungs\",\n      \"pmids\": [\"24081657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream receptors coupling to Gα12 for basal secretion not defined\", \"Membrane fusion machinery downstream not connected here\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided quantitative single-molecule confirmation that shear-induced A2 unfolding gates ADAMTS13 cleavage above a defined shear threshold.\",\n      \"evidence\": \"fluorescence correlation spectroscopy in a microfluidic shear cell with Brownian hydrodynamics simulations\",\n      \"pmids\": [\"26840720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo shear-rate distributions relative to the measured threshold not mapped\", \"Influence of platelet binding on the unfolding threshold not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified the receptor systems clearing the VWF-FVIII complex and the A2-vimentin tether retaining strings at the endothelial surface.\",\n      \"evidence\": \"stabilin-2 and CLEC4M binding/internalization assays with KO and PK studies, plus vimentin-KO arteries and A2-protein blocking with stroke models\",\n      \"pmids\": [\"30124466\", \"30740857\", \"30355099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative quantitative contribution of each clearance receptor in humans not resolved\", \"Mechanism coupling A2-vimentin tethering to string stability incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Separated WPB maturation from exocytic control, identifying BLOC-2 as required for endosomal input/maturation and exocyst as a paradoxical clamp on release.\",\n      \"evidence\": \"siRNA depletion, BLOC-2 reciprocal Co-IP, exocyst inhibitor Endosidin2, and WPB ultrastructure/multimer analysis\",\n      \"pmids\": [\"32614949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How exocyst simultaneously promotes maturation and clamps release mechanistically unresolved\", \"Endosomal cargo delivered to WPBs not enumerated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated that endothelial VWF drives thromboinflammation across distinct disease settings (sickle cell vaso-occlusion, TBI, venous thrombosis) and identified the A1 LRP1-clearance cluster and the GPIbα cytoplasmic tail signaling requirement.\",\n      \"evidence\": \"endothelial-specific VWF KO in SCD mice with ADAMTS13 rescue, A2-protein blocking in TBI, PTP1B-KO/SNAP23 phosphorylation studies, K1405-K1408 mutagenesis with in vivo clearance, and CRISPR GPIbα tail-deletion platelets\",\n      \"pmids\": [\"35969769\", \"33507292\", \"38563147\", \"38996211\", \"34134470\", \"26209660\", \"22712744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Therapeutic windows of A2-domain blockade in humans untested\", \"Cross-talk between clearance and thromboinflammatory roles not integrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended VWF function beyond hemostasis to vascular remodeling, showing A2-domain binding to LRP4/αvβ3 drives smooth muscle cell proliferation and neointimal hyperplasia.\",\n      \"evidence\": \"siRNA against αv and LRP4, RAP inhibition, proximity ligation/Co-IP, and VWF-KO mouse injury models\",\n      \"pmids\": [\"33576766\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling downstream of αvβ3 in VSMCs not delineated\", \"Whether circulating versus locally secreted VWF mediates this not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How VWF transcriptional induction (by GATA factors, HMGB1-TLR2-SP1, hyperglycemia) and pathogen/leukocyte interactions (S. aureus ClfA, SLC44A2 neutrophils) integrate with the secretion-cleavage-clearance axis to set VWF function in disease remains open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Transcriptional regulators identified largely in single-lab, context-specific models\", \"Integration of bacterial and leukocyte adhesion roles with hemostatic functions not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [4, 11, 17, 35]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9, 17]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 5, 6, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [3, 9, 20, 34]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [10, 17]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 11, 16, 23]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [33, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [4, 7, 11, 28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 6, 24]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9, 14, 20, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21, 32, 35]}\n    ],\n    \"complexes\": [\n      \"Weibel-Palade body\",\n      \"VWF-FVIII complex\"\n    ],\n    \"partners\": [\n      \"ADAMTS13\",\n      \"GP1BA\",\n      \"VIM\",\n      \"LRP1\",\n      \"STAB2\",\n      \"CLEC4M\",\n      \"LRP4\",\n      \"THBS1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}