{"gene":"PLVAP","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":1999,"finding":"PV-1 (PLVAP) is a novel single-span type II integral membrane glycoprotein that forms homodimers in situ, is N-glycosylated, and localizes specifically to the stomatal diaphragms of endothelial caveolae in rat lung, with its large COOH-terminal ectodomain exposed to blood plasma.","method":"Immunoisolation of caveolar subfraction, cDNA cloning, partial protein sequencing, immunocytochemistry/immunodiffusion at electron microscope level","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — original cloning and characterization with multiple orthogonal methods (biochemical isolation, sequencing, EM immunolocalization)","pmids":["10366592"],"is_preprint":false},{"year":1999,"finding":"PV-1 (PLVAP) is a component of both fenestral diaphragms and stomatal diaphragms of caveolae and transendothelial channels in fenestrated endothelia (kidney, intestinal villi, pancreas, adrenals), but is absent from non-diaphragmed fenestrated endothelium (kidney glomeruli) and continuous endothelium.","method":"Immunofluorescence and immunolocalization at electron microscope level using anti-PV-1 antibody in multiple rat organs","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — rigorous EM immunolocalization across multiple tissues, replicated in same study by multiple methods","pmids":["10557298"],"is_preprint":false},{"year":2001,"finding":"The PLVAP extracellular domain contains four N-glycosylation sites, two coiled-coil domains, a proline-rich region, and evenly spaced cysteines; the gene has a classical TATA-driven promoter with several transcription factor binding sites conserved between human and mouse.","method":"cDNA sequencing, genomic organization analysis, Northern blotting, radiation hybrid panel mapping, bioinformatic analysis of 5' flanking regions","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — sequence/structural characterization with Northern blot, single study","pmids":["11401446"],"is_preprint":false},{"year":2003,"finding":"Multiple PV1 homodimers reside within each stomatal or fenestral diaphragm, supporting a model in which PV1 dimers form the fibrillar spokes of diaphragms.","method":"Biochemical crosslinking and immunolocalization studies demonstrating proximity of multiple PV1 homodimers in individual diaphragms","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct structural/biochemical measurement, single lab","pmids":["14630628"],"is_preprint":false},{"year":2004,"finding":"PV1 is a key structural component necessary and sufficient for biogenesis of stomatal and fenestral diaphragms: siRNA-mediated silencing prevents de novo formation of caveolar and fenestral diaphragms, while overexpression of PV1 in endothelial and non-endothelial cells induces de novo formation of caveolar stomatal diaphragms. PMA-induced upregulation of PV1 and diaphragm formation requires Erk1/2 MAP kinase activation and is protein kinase C-independent.","method":"siRNA knockdown, overexpression in endothelial and non-endothelial cells, PMA treatment, pharmacological inhibition of signaling pathways, electron microscopy","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 — loss-of-function (siRNA) and gain-of-function (overexpression) with defined structural phenotype, multiple orthogonal methods","pmids":["15155804"],"is_preprint":false},{"year":2005,"finding":"VEGF signaling through VEGFR2 stimulates PLVAP transcription and protein expression in cultured endothelial cells; this induction is blocked by anti-VEGF antibody and by inhibitors of PI3K (LY294002) or p38 MAPK (SB203580), but not by MEK/ERK1 inhibitor PD98059.","method":"In vitro endothelial cell culture with receptor-selective VEGF forms, neutralizing antibody, and pharmacological inhibitors; RT-PCR and protein expression analysis","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple pharmacological inhibitors and antibody blockade, single lab","pmids":["15971170"],"is_preprint":false},{"year":2006,"finding":"PV-1 is required for fenestral pore architecture and the ordered arrangement of fenestrae in sieve plates; actin microfilament remodeling is part of fenestra biogenesis, and PV-1 loss-of-function disrupts normal fenestral structure.","method":"In vitro fenestra induction assay, loss-of-function approach with actin-stabilizing/depolymerizing agents, electron microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution assay with loss-of-function and pharmacological manipulation, EM validation","pmids":["17075074"],"is_preprint":false},{"year":2011,"finding":"Angiotensin II increases endothelial permeability and PV-1 expression through AT1 receptor and p38 MAP kinase signaling, with VEGF-R2 also involved; this is associated with increased caveolae formation and transcellular channel openings.","method":"FITC-Dextran and electrical impedance permeability assays, PCR, atomic force microscopy, transmission electron microscopy, pharmacological blockade (candesartan, ZM-323881, SB-203580) in HUVECs","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods with receptor antagonists, single lab","pmids":["22012329"],"is_preprint":false},{"year":2012,"finding":"Genetic deletion of PLVAP in mice results in complete absence of diaphragms in fenestrae, caveolae, and transendothelial channels, associated with substantial reduction in endothelial fenestrae number. In utero lethality in C57BL/6N background with subcutaneous edema, hemorrhages, and cardiac defects; postnatal survivors show retarded growth and anemia.","method":"Plvap knockout mouse generation, electron microscopy, histochemistry, phenotypic analysis","journal":"Histochemistry and cell biology","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout with defined ultrastructural and physiological phenotypes, multiple tissues examined","pmids":["22782339"],"is_preprint":false},{"year":2012,"finding":"PLVAP is expressed in endothelial cells of Schlemm's canal and fenestrated capillaries of the eye (choroid, ciliary processes); PLVAP deficiency results in complete absence of stomatal diaphragms in Schlemm's canal caveolae and absence of fenestral diaphragms in ciliary processes and choriocapillaris, with decreased fenestrae number.","method":"Immunolocalization in mouse, pig, and human eyes; LacZ reporter in Plvap-deficient mice; transmission electron microscopy","journal":"Experimental eye research","confidence":"High","confidence_rationale":"Tier 2 — multi-species immunolocalization and knockout EM analysis","pmids":["23063469"],"is_preprint":false},{"year":2012,"finding":"PV1 is retained on the endothelial cell surface by caveolae, fenestrae, and transendothelial channels; in the absence of caveolae (caveolin-1 or cavin-1 knockout), PV1 protein is dramatically reduced due to increased internalization via a clathrin- and dynamin-independent pathway followed by lysosomal degradation, without changes in PV1 transcription or translation. This indicates that diaphragm formation is the primary cellular role of PV1.","method":"Caveolin-1 and cavin-1 knockout mice, protein level quantification, internalization assays, lysosomal inhibition, siRNA, cell fractionation","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — genetic knockouts combined with mechanistic internalization/degradation assays, multiple orthogonal approaches","pmids":["22403691"],"is_preprint":false},{"year":2012,"finding":"PV-1 is the antigen recognized by the PAL-E antibody; PV-1 and NRP-1 form protein complexes as demonstrated by co-immunoprecipitation, connecting two molecules involved in leukocyte trafficking and angiogenesis.","method":"Flow cytometry with transfected cells, immunofluorescence, co-immunoprecipitation from tissue lysates and transfected cells","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP identification of PV-1/NRP-1 complex, single lab with flow cytometry confirmation of PAL-E identity","pmids":["22627768"],"is_preprint":false},{"year":2015,"finding":"PLVAP is expressed in lymphatic sinus-lining endothelial cells of lymph nodes and forms physical diaphragms in transendothelial channels that act as a sieve to control size-selective entry of antigens and transmigration of lymphocytes into the lymph node parenchyma; PLVAP-deficient mice show augmented lymphocyte transmigration and loss of size-selective antigen filtering.","method":"PLVAP-deficient mouse model, intravital imaging, electron microscopy, antigen tracking experiments","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout with mechanistic in vivo imaging and EM, strong phenotypic readout across multiple experimental approaches","pmids":["25665101"],"is_preprint":false},{"year":2018,"finding":"PLVAP functions as a cellular receptor for Japanese Encephalitis Virus (JEV) E-glycoprotein in neurons; overexpression of PLVAP increases viral load and silencing reduces it, and PLVAP is significantly upregulated in JEV-infected mouse brain and neuro2a cells.","method":"Pull-down assay with JEV E-glycoprotein and plasma membrane fraction, 2D gel electrophoresis, mass spectrometry, PLVAP overexpression and silencing in neuro2a cells, viral load quantification, in silico docking","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — pull-down plus gain/loss-of-function with viral load readout, single lab","pmids":["30082709"],"is_preprint":false},{"year":2018,"finding":"PMA-induced PLVAP upregulation requires autocrine/paracrine secreted factors including VEGF-A (signaling through VEGFR2) and additional unidentified secreted molecules, acting through MEK1/Erk1/2 MAP kinase pathway; inhibition of p38, JNK, PI3K, or Akt does not block PMA-induced PLVAP upregulation.","method":"VEGF-A antibody neutralization, VEGF-A siRNA, VEGFR2 pharmacological inhibition, MEK1/Erk1/2 inhibitors, conditioned medium experiments in endothelial cells","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — multiple pharmacological and genetic inhibition approaches, single lab","pmids":["30394679"],"is_preprint":false},{"year":2019,"finding":"Plvap in zebrafish hypophyseal fenestrated endothelium limits the rate of blood-borne protein passage through fenestrae; plvapb mutants show deficiencies in fenestral diaphragms and increased fenestrae density, and direct measurement of DBP-EGFP plasma protein extravasation demonstrates faster passage in mutants.","method":"Zebrafish plvapb mutants, transgenic DBP-EGFP plasma protein biosensor, live imaging quantification of extravasation, ultrastructural analysis by electron microscopy","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 — direct functional measurement of protein passage rate in genetic mutant with in vivo biosensor and EM validation","pmids":["31740533"],"is_preprint":false},{"year":2019,"finding":"VEGFA stimulates PLVAP expression in choroidal endothelial cells; loss of PLVAP disrupts the polarized structure of choriocapillaris leading to retinal degeneration, and VEGFA-PLVAP axis is required for maintenance of choriocapillaris fenestrated endothelium.","method":"Oxygen-induced retinopathy mouse model, VEGFA stimulation of choroidal endothelial cells, PLVAP knockdown, electron microscopy, expression analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro VEGFA stimulation plus in vivo loss-of-function with structural readout, single lab","pmids":["31759628"],"is_preprint":false},{"year":2019,"finding":"Fenestrations in fetal liver sinusoidal endothelial cells (LSEC) contain PLVAP diaphragms, but these are lost at birth; adult LSEC express PLVAP luminally without diaphragms, and absence of PLVAP does not affect fenestrae morphology or number in adult liver sinusoids. Fetal LSEC PLVAP associates with LYVE-1, neuropilin-1 and VEGFR2 in a developmentally regulated complex.","method":"Plvap-deficient mice, multiple imaging techniques (electron microscopy, confocal), co-immunoprecipitation/association studies in fetal vs adult LSEC","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — knockout mice with multi-method localization and co-IP showing developmental stage-specific complexes, single lab","pmids":["31666588"],"is_preprint":false},{"year":2020,"finding":"Endothelial cell-specific deletion of PV1 increases lung vascular permeability to fluid and protein, promotes albumin accumulation in caveolae bulbs, induces caveolar swelling, and increases caveolae-mediated transcytosis of albumin — all without disruption of endothelial junctions. Endotoxin exposure reduces PV1 protein expression and increases permeability by a similar mechanism.","method":"Tamoxifen-induced endothelial-specific PV1 floxed knockout (Cdh5.Cre.ERT2), permeability assays, electron microscopy with Au-albumin tracer, FRAP, LPS challenge in vivo","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 — conditional endothelial-specific knockout with multiple orthogonal mechanistic readouts and tracer studies","pmids":["32663411"],"is_preprint":false},{"year":2021,"finding":"Fibronectin-integrin α5β1 signaling regulates PLVAP localization at endothelial fenestral sieve plates via microtubule stabilization; inhibition of integrin α5β1 or FAK causes microtubule depolymerization and delocalization of PLVAP from sieve plates to the Golgi apparatus, which can be rescued by paclitaxel-mediated microtubule stabilization.","method":"Pharmacological inhibition of integrin α5β1 (ATN-161), FAK inhibitor, paclitaxel, colcemid, Brefeldin A treatment; PLVAP localization by immunofluorescence in primary endothelial cells from rat pituitary anterior lobe","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple pharmacological interventions with consistent mechanistic readout, single lab","pmids":["33447878"],"is_preprint":false},{"year":2022,"finding":"Empagliflozin (SGLT2 inhibitor) protects glomerular endothelial cell fenestrations in diabetic mice through the VEGF-A/caveolin-1/PV-1 signaling axis; podocyte-derived VEGF-A drives abnormal endothelial caveolin-1 and PV-1 expression in diabetes, leading to loss of fenestrations and increased permeability.","method":"BTBR ob/ob mouse model, empagliflozin treatment, electron microscopy, immunohistochemistry, VEGF-A and PLVAP expression analysis","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo pharmacological intervention with mechanistic pathway analysis and EM, single lab","pmids":["35000230"],"is_preprint":false},{"year":2023,"finding":"The crystal structure of an 89-amino acid segment of the PLVAP extracellular domain shows a parallel dimeric alpha-helical coiled-coil configuration with five interchain disulfide bonds; overall ~2/3 of the ~390-amino acid extracellular domain adopts helical configuration. This structural data supports the model of ~10 PLVAP dimers arranged as spokes of a bicycle wheel within each 60-80 nm diaphragm opening.","method":"X-ray crystallography (sulfur SAD phasing), circular dichroism spectroscopy, biochemical characterization of PLVAP extracellular domain segments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with biochemical validation by CD and SAD phasing, structural basis for functional model","pmids":["36996108"],"is_preprint":false},{"year":2023,"finding":"PLVAP upregulation in liver sinusoidal endothelial cells (LSEC) driven by the senescence-associated secretory phenotype (SASP) selectively promotes monocyte transmigration by regulating endothelial permeability through phospho-VE-cadherin expression and endothelial gap formation.","method":"SASP exposure of human LSEC, PLVAP knockdown, flow-based leukocyte transmigration assays, VE-cadherin phosphorylation analysis","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 — knockdown with functional transmigration assay and defined molecular readout, single lab","pmids":["37810232"],"is_preprint":false},{"year":2024,"finding":"The transcription factor NKX2-3 acts upstream of PLVAP and promotes its expression; NKX2-3 induction in HUVECs upregulates PLVAP (and SPARCL1), and NKX2-3 binding motifs are found in ~40% of pancreatic endothelial signature genes including PLVAP.","method":"NKX2-3 gene transfection in HUVECs, RT-qPCR, single-cell RNA-sequencing meta-analysis, DNA binding motif analysis","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function with gene expression readout, supported by motif analysis, single lab","pmids":["39445426"],"is_preprint":false},{"year":2011,"finding":"PV1 protein in Cav-1 null mouse lung is nearly undetectable in endothelial cells due to negative regulation by VEGF-R2 signaling; VEGF-R2 inhibition rescues PV1 protein levels without changing mRNA levels. PV1 co-immunoprecipitates with Cav-1 protein, suggesting physical association, but does not fractionate with caveolae on sucrose density gradients.","method":"Cav-1 and Cav-2 null mice, VEGF-R2 inhibitor treatment, sucrose density gradient fractionation, co-immunoprecipitation, immunofluorescence","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 — genetic null mice combined with pharmacological rescue and co-IP, single lab","pmids":["16969073"],"is_preprint":false},{"year":2011,"finding":"PV1 expression in CV-1 cells reduces SV40 virus infectivity at low viral concentrations without reducing surface expression of SV40 receptors (GM1 ganglioside, MHC class I) or virus-like particle binding/internalization, suggesting PV1 acts at the level of productive endosomal trafficking rather than viral binding.","method":"PV1 overexpression in CV-1 cells, SV40 infectivity assays at multiple viral concentrations, flow cytometry for receptor expression, VLP binding and internalization assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — gain-of-function with mechanistic exclusion experiments, single lab","pmids":["21827737"],"is_preprint":false}],"current_model":"PLVAP (PV-1) is an endothelial-specific type II transmembrane glycoprotein that forms homodimers with a parallel coiled-coil extracellular domain stabilized by interchain disulfide bonds; approximately ten PLVAP dimers assemble as radial spoke-like fibrils within each diaphragm of endothelial fenestrae, caveolae, and transendothelial channels, where they act as a size-selective permeability barrier limiting transcytosis of plasma proteins (including albumin) and regulating passage of blood-borne molecules into tissues; PLVAP expression is transcriptionally induced by VEGF-A via VEGFR2 through MEK1/Erk1/2 and PI3K/p38 MAPK signaling, by angiotensin II via AT1R/p38, and by the transcription factor NKX2-3, while its surface stability depends on caveolae (loss of caveolin-1 triggers clathrin/dynamin-independent internalization and lysosomal degradation of PLVAP); in lymphatic sinuses PLVAP forms physical diaphragms that filter antigen entry and regulate lymphocyte transmigration, and in zebrafish hypophyseal fenestrae Plvap directly limits the rate of blood-borne protein extravasation."},"narrative":{"teleology":[{"year":1999,"claim":"Identifying the molecular constituent of endothelial diaphragms resolved a decades-old ultrastructural mystery: PLVAP (PV-1) was cloned as a novel homodimeric type II transmembrane glycoprotein localized specifically to stomatal diaphragms of caveolae and fenestrae across multiple organs, but absent from non-diaphragmed fenestrated endothelium.","evidence":"Immunoisolation of caveolar subfractions, cDNA cloning, EM immunolocalization in multiple rat tissues","pmids":["10366592","10557298"],"confidence":"High","gaps":["Stoichiometry of PLVAP within a single diaphragm was unknown","Functional consequence of PLVAP loss had not been tested","Mechanism of diaphragm assembly was unclear"]},{"year":2003,"claim":"Determining whether diaphragms contain one or multiple PLVAP dimers established the multimeric spoke model: crosslinking showed multiple homodimers reside within each diaphragm, consistent with PLVAP dimers forming the radial fibrils.","evidence":"Biochemical crosslinking and immunolocalization quantifying homodimer occupancy per diaphragm","pmids":["14630628"],"confidence":"Medium","gaps":["Precise number of dimers per diaphragm was estimated, not directly measured","Arrangement geometry was inferred, not resolved structurally"]},{"year":2004,"claim":"Establishing necessity and sufficiency answered whether PLVAP is the key structural determinant of diaphragm biogenesis: siRNA knockdown prevented de novo diaphragm formation while overexpression induced diaphragms even in non-endothelial cells, and PMA-stimulated induction required Erk1/2 signaling.","evidence":"siRNA knockdown and ectopic overexpression in endothelial and non-endothelial cells with EM readout, pharmacological pathway inhibition","pmids":["15155804"],"confidence":"High","gaps":["Downstream partners mediating diaphragm assembly were not identified","How PLVAP expression alone is sufficient for diaphragm geometry was unexplained"]},{"year":2005,"claim":"Delineating upstream signals showed VEGF-A/VEGFR2 as a transcriptional inducer of PLVAP via PI3K and p38 MAPK, linking angiogenic signaling to diaphragm biogenesis; angiotensin II was later shown to independently upregulate PLVAP through AT1R/p38.","evidence":"Pharmacological inhibitor panels and neutralizing antibodies in cultured endothelial cells; later HUVEC studies with AT1R blockade","pmids":["15971170","22012329","30394679"],"confidence":"Medium","gaps":["Discrepancies between PMA-induced (ERK-dependent) and VEGF-induced (p38-dependent) pathways were not fully reconciled","Transcription factor(s) directly binding the PLVAP promoter downstream of these kinases were not identified"]},{"year":2006,"claim":"Connecting PLVAP to fenestral pore architecture demonstrated that PV-1 is required not only for diaphragm formation but also for the ordered arrangement of fenestrae within sieve plates, linking actin remodeling to the process.","evidence":"In vitro fenestra induction assay with pharmacological manipulation of actin dynamics and PV-1 loss-of-function, EM validation","pmids":["17075074"],"confidence":"High","gaps":["Direct physical interaction between PLVAP and actin cytoskeleton was not demonstrated","Whether actin remodeling is upstream or downstream of PLVAP assembly was unclear"]},{"year":2011,"claim":"Determining how caveolae control PLVAP stability revealed that in caveolin-1-null mice, PV1 is rapidly internalized via a clathrin/dynamin-independent pathway and degraded in lysosomes, showing caveolae serve as the surface retention platform for PLVAP.","evidence":"Caveolin-1 and cavin-1 knockout mice, internalization assays, lysosomal inhibition, co-IP of PV1 with caveolin-1","pmids":["22403691","16969073"],"confidence":"High","gaps":["The clathrin/dynamin-independent internalization pathway was not molecularly characterized","Whether PV1-caveolin-1 co-IP reflects direct binding or proximity within membrane domains was unresolved"]},{"year":2012,"claim":"Genetic knockout in mice provided the definitive in vivo proof that PLVAP is indispensable for all endothelial diaphragms: Plvap-null mice completely lack fenestral, caveolar, and transendothelial channel diaphragms, exhibit reduced fenestrae numbers, and die in utero or perinatally with edema, hemorrhage, and cardiac defects.","evidence":"Plvap knockout mice on C57BL/6N background, EM of multiple organs including eyes, phenotypic characterization","pmids":["22782339","23063469"],"confidence":"High","gaps":["Whether lethality is driven primarily by vascular leak, cardiac malformation, or both was not dissected","Tissue-specific rescue experiments were not performed"]},{"year":2015,"claim":"Extending PLVAP function beyond vascular permeability, diaphragms formed by PLVAP in lymph node sinus-lining endothelium were shown to physically sieve antigens by size and regulate lymphocyte transmigration, establishing an immune-filtering role.","evidence":"PLVAP-deficient mice, intravital imaging, EM, antigen tracking in lymph nodes","pmids":["25665101"],"confidence":"High","gaps":["Molecular basis of size selectivity (pore geometry vs charge) was not defined","Whether PLVAP diaphragms actively participate in lymphocyte diapedesis signaling or act purely as a physical barrier was unclear"]},{"year":2019,"claim":"Direct measurement of plasma protein extravasation rate in zebrafish plvapb mutants provided the first quantitative in vivo demonstration that PLVAP diaphragms limit transcellular protein passage through fenestrae.","evidence":"Zebrafish plvapb mutants with transgenic DBP-EGFP plasma protein biosensor, live imaging, EM","pmids":["31740533"],"confidence":"High","gaps":["Whether PLVAP selectivity is purely steric or involves charge-based exclusion was not tested","Extravasation kinetics for diverse protein sizes were not systematically measured"]},{"year":2020,"claim":"Conditional endothelial-specific deletion demonstrated that PLVAP loss specifically increases caveolae-mediated albumin transcytosis and lung vascular permeability without disrupting endothelial junctions, pinpointing the transcellular pathway as the regulated route.","evidence":"Tamoxifen-induced endothelial Plvap knockout (Cdh5.Cre.ERT2), gold-albumin tracer EM, LPS challenge","pmids":["32663411"],"confidence":"High","gaps":["Whether PLVAP loss affects transcytosis in all vascular beds equally was not assessed","Mechanism by which diaphragm absence promotes caveolar swelling and increased transcytosis was not molecularly defined"]},{"year":2021,"claim":"Fibronectin-integrin α5β1-FAK signaling was identified as a regulator of PLVAP localization at sieve plates via microtubule stabilization, revealing extracellular matrix cues control PLVAP trafficking from Golgi to fenestrae.","evidence":"Pharmacological inhibition of integrin α5β1, FAK, and microtubule dynamics in primary endothelial cells with PLVAP localization readout","pmids":["33447878"],"confidence":"Medium","gaps":["Direct interaction between microtubules and PLVAP-containing vesicles was not shown","In vivo relevance of integrin-PLVAP trafficking axis was not tested"]},{"year":2023,"claim":"The crystal structure of PLVAP's extracellular domain resolved the molecular architecture: a parallel dimeric alpha-helical coiled-coil stabilized by five interchain disulfide bonds, supporting a model of ~10 dimers arranged as bicycle-wheel spokes spanning each 60–80 nm diaphragm.","evidence":"X-ray crystallography (sulfur SAD phasing) of 89 aa segment, circular dichroism of full ectodomain","pmids":["36996108"],"confidence":"High","gaps":["Structure of the N-terminal hub and C-terminal tip regions connecting spokes to the rim was not resolved","Full-length ectodomain structure and inter-dimer contacts within the diaphragm remain unknown"]},{"year":2024,"claim":"NKX2-3 was identified as a transcription factor upstream of PLVAP, linking organ-specific endothelial identity programs to diaphragm biogenesis in pancreatic endothelium.","evidence":"NKX2-3 overexpression in HUVECs with RT-qPCR readout, DNA binding motif analysis in single-cell RNA-seq datasets","pmids":["39445426"],"confidence":"Medium","gaps":["Direct NKX2-3 binding to the PLVAP promoter was not demonstrated by ChIP","Whether NKX2-3 is required for PLVAP expression in vivo was not tested"]},{"year":null,"claim":"Key unresolved questions include the full atomic structure of an assembled diaphragm (inter-dimer contacts, hub/rim architecture), the molecular basis of size selectivity, and how tissue-specific transcription factors coordinate PLVAP expression across different vascular beds.","evidence":"","pmids":[],"confidence":"High","gaps":["No complete structural model of the assembled diaphragm exists","Charge versus size contributions to permeability selectivity are undefined","Tissue-specific transcriptional regulation of PLVAP remains fragmentary"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,3,4,6,8,21]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,4,10,18]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[19]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,7,14,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,22]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[15,18]}],"complexes":["PLVAP homodimer (diaphragm spoke)"],"partners":["CAV1","NRP1","VEGFR2","LYVE1","ITGA5"],"other_free_text":[]},"mechanistic_narrative":"PLVAP (PV-1) is an endothelial-specific type II transmembrane glycoprotein that serves as the essential structural component of diaphragms in fenestrae, caveolae, and transendothelial channels, functioning as a size-selective permeability barrier controlling transcellular passage of plasma proteins and immune cells. Approximately ten PLVAP homodimers, organized as parallel coiled-coil structures stabilized by interchain disulfide bonds, assemble radially as the spoke-like fibrils of each ~60–80 nm diaphragm; loss of PLVAP eliminates all diaphragms, increases caveolae-mediated albumin transcytosis, and causes vascular leakage, edema, and embryonic lethality in mice [PMID:22782339, PMID:32663411, PMID:36996108]. PLVAP expression is transcriptionally induced by VEGF-A via VEGFR2 through MEK1/Erk1/2 and PI3K/p38 MAPK pathways, by angiotensin II via AT1R/p38, and by the transcription factor NKX2-3, while its surface retention depends on caveolae—loss of caveolin-1 triggers clathrin/dynamin-independent internalization and lysosomal degradation [PMID:15155804, PMID:22403691, PMID:30394679, PMID:22012329, PMID:39445426]. In lymph node sinuses, PLVAP diaphragms physically sieve antigens by size and regulate lymphocyte transmigration into the parenchyma [PMID:25665101]."},"prefetch_data":{"uniprot":{"accession":"Q9BX97","full_name":"Plasmalemma vesicle-associated protein","aliases":["Fenestrated endothelial-linked structure protein","Plasmalemma vesicle protein 1","PV-1"],"length_aa":442,"mass_kda":50.6,"function":"Endothelial cell-specific membrane protein involved in the formation of the diaphragms that bridge endothelial fenestrae. It is also required for the formation of stomata of caveolae and transendothelial channels. Functions in microvascular permeability, endothelial fenestrae contributing to the passage of water and solutes and regulating transcellular versus paracellular flow in different organs. 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nerve","url":"https://pubmed.ncbi.nlm.nih.gov/1647189","citation_count":1,"is_preprint":false},{"pmid":"41064230","id":"PMC_41064230","title":"CD44, ACAN, PLVAP, and HBEGF Emerged as Potential Biomarkers in Diabetic Retinopathy.","date":"2025","source":"Diabetes, metabolic syndrome and obesity : targets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/41064230","citation_count":0,"is_preprint":false},{"pmid":"41428257","id":"PMC_41428257","title":"Computational analysis of Non-synonymous SNP effects on human PLVAP gene structure and function.","date":"2025","source":"Journal of applied genetics","url":"https://pubmed.ncbi.nlm.nih.gov/41428257","citation_count":0,"is_preprint":false},{"pmid":"1696324","id":"PMC_1696324","title":"[Immunohistological demonstration of developmental protein GP68 in human tumor and embryonic tissues].","date":"1990","source":"Gan no rinsho. Japan journal of cancer clinics","url":"https://pubmed.ncbi.nlm.nih.gov/1696324","citation_count":0,"is_preprint":false},{"pmid":"41431249","id":"PMC_41431249","title":"PLVAP mediates the regulation of the tumour microenvironment in early-stage lung adenocarcinoma.","date":"2025","source":"Clinical and translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41431249","citation_count":0,"is_preprint":false},{"pmid":"40496867","id":"PMC_40496867","title":"Dissecting the endothelial cell landscape in meningioma: single-cell insights into PLVAP+ subpopulations and their role in tumor angiogenesis.","date":"2025","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/40496867","citation_count":0,"is_preprint":false},{"pmid":"40429953","id":"PMC_40429953","title":"Endophenotype-Informed Association Analyses for Liver Fat Accumulation and Metabolic Dysfunction in the Fels Longitudinal Study.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40429953","citation_count":0,"is_preprint":false},{"pmid":"28514072","id":"PMC_28514072","title":"Sibling correlations for skeletal age assessments by the Fels method.","date":"1989","source":"American journal of human biology : the official journal of the Human Biology Council","url":"https://pubmed.ncbi.nlm.nih.gov/28514072","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.10.03.616513","title":"ENDOTHELIAL PROX1 INDUCES BLOOD-BRAIN BARRIER DISRUPTION IN THE CENTRAL NERVOUS SYSTEM","date":"2024-10-04","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.03.616513","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.11.03.686255","title":"Two routes to land: Genomic underpinnings of parallel aerial egg deposition in aquatic Old-World  <i>Pila</i>  and New-World  <i>Pomacea</i>  (Ampullariidae)","date":"2025-11-04","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.03.686255","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.12.647817","title":"Selective decoupling of IgG1 binding to viral Fc receptors restores antibody-mediated NK cell activation against HCMV","date":"2025-04-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.12.647817","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.21.634111","title":"Molecular Requirements for  <i>C. elegans</i>  Transgenerational Epigenetic Inheritance of Pathogen Avoidance","date":"2025-01-24","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.21.634111","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.05.23.595334","title":"<i>Pseudomonas fluorescens 15</i>small RNA Pfs1 mediates transgenerational epigenetic inheritance of pathogen avoidance in<i>C. elegans</i>through the Ephrin receptor VAB-1","date":"2024-05-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.05.23.595334","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.05.23.595652","title":"Stearoyl coenzyme A desaturase 1 (SCD1) regulates foot-and-mouth disease virus replication by modulating host cell lipid metabolism and 2C-mediated replication complex formation","date":"2024-05-24","source":"bioRxiv","url":"https://doi.org/10.1101/2024.05.23.595652","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47745,"output_tokens":6437,"usd":0.119895},"stage2":{"model":"claude-opus-4-6","input_tokens":10054,"output_tokens":3515,"usd":0.207217},"total_usd":0.327112,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"PV-1 (PLVAP) is a novel single-span type II integral membrane glycoprotein that forms homodimers in situ, is N-glycosylated, and localizes specifically to the stomatal diaphragms of endothelial caveolae in rat lung, with its large COOH-terminal ectodomain exposed to blood plasma.\",\n      \"method\": \"Immunoisolation of caveolar subfraction, cDNA cloning, partial protein sequencing, immunocytochemistry/immunodiffusion at electron microscope level\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning and characterization with multiple orthogonal methods (biochemical isolation, sequencing, EM immunolocalization)\",\n      \"pmids\": [\"10366592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"PV-1 (PLVAP) is a component of both fenestral diaphragms and stomatal diaphragms of caveolae and transendothelial channels in fenestrated endothelia (kidney, intestinal villi, pancreas, adrenals), but is absent from non-diaphragmed fenestrated endothelium (kidney glomeruli) and continuous endothelium.\",\n      \"method\": \"Immunofluorescence and immunolocalization at electron microscope level using anti-PV-1 antibody in multiple rat organs\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous EM immunolocalization across multiple tissues, replicated in same study by multiple methods\",\n      \"pmids\": [\"10557298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The PLVAP extracellular domain contains four N-glycosylation sites, two coiled-coil domains, a proline-rich region, and evenly spaced cysteines; the gene has a classical TATA-driven promoter with several transcription factor binding sites conserved between human and mouse.\",\n      \"method\": \"cDNA sequencing, genomic organization analysis, Northern blotting, radiation hybrid panel mapping, bioinformatic analysis of 5' flanking regions\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — sequence/structural characterization with Northern blot, single study\",\n      \"pmids\": [\"11401446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Multiple PV1 homodimers reside within each stomatal or fenestral diaphragm, supporting a model in which PV1 dimers form the fibrillar spokes of diaphragms.\",\n      \"method\": \"Biochemical crosslinking and immunolocalization studies demonstrating proximity of multiple PV1 homodimers in individual diaphragms\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct structural/biochemical measurement, single lab\",\n      \"pmids\": [\"14630628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PV1 is a key structural component necessary and sufficient for biogenesis of stomatal and fenestral diaphragms: siRNA-mediated silencing prevents de novo formation of caveolar and fenestral diaphragms, while overexpression of PV1 in endothelial and non-endothelial cells induces de novo formation of caveolar stomatal diaphragms. PMA-induced upregulation of PV1 and diaphragm formation requires Erk1/2 MAP kinase activation and is protein kinase C-independent.\",\n      \"method\": \"siRNA knockdown, overexpression in endothelial and non-endothelial cells, PMA treatment, pharmacological inhibition of signaling pathways, electron microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — loss-of-function (siRNA) and gain-of-function (overexpression) with defined structural phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"15155804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"VEGF signaling through VEGFR2 stimulates PLVAP transcription and protein expression in cultured endothelial cells; this induction is blocked by anti-VEGF antibody and by inhibitors of PI3K (LY294002) or p38 MAPK (SB203580), but not by MEK/ERK1 inhibitor PD98059.\",\n      \"method\": \"In vitro endothelial cell culture with receptor-selective VEGF forms, neutralizing antibody, and pharmacological inhibitors; RT-PCR and protein expression analysis\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological inhibitors and antibody blockade, single lab\",\n      \"pmids\": [\"15971170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PV-1 is required for fenestral pore architecture and the ordered arrangement of fenestrae in sieve plates; actin microfilament remodeling is part of fenestra biogenesis, and PV-1 loss-of-function disrupts normal fenestral structure.\",\n      \"method\": \"In vitro fenestra induction assay, loss-of-function approach with actin-stabilizing/depolymerizing agents, electron microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution assay with loss-of-function and pharmacological manipulation, EM validation\",\n      \"pmids\": [\"17075074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Angiotensin II increases endothelial permeability and PV-1 expression through AT1 receptor and p38 MAP kinase signaling, with VEGF-R2 also involved; this is associated with increased caveolae formation and transcellular channel openings.\",\n      \"method\": \"FITC-Dextran and electrical impedance permeability assays, PCR, atomic force microscopy, transmission electron microscopy, pharmacological blockade (candesartan, ZM-323881, SB-203580) in HUVECs\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with receptor antagonists, single lab\",\n      \"pmids\": [\"22012329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Genetic deletion of PLVAP in mice results in complete absence of diaphragms in fenestrae, caveolae, and transendothelial channels, associated with substantial reduction in endothelial fenestrae number. In utero lethality in C57BL/6N background with subcutaneous edema, hemorrhages, and cardiac defects; postnatal survivors show retarded growth and anemia.\",\n      \"method\": \"Plvap knockout mouse generation, electron microscopy, histochemistry, phenotypic analysis\",\n      \"journal\": \"Histochemistry and cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with defined ultrastructural and physiological phenotypes, multiple tissues examined\",\n      \"pmids\": [\"22782339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PLVAP is expressed in endothelial cells of Schlemm's canal and fenestrated capillaries of the eye (choroid, ciliary processes); PLVAP deficiency results in complete absence of stomatal diaphragms in Schlemm's canal caveolae and absence of fenestral diaphragms in ciliary processes and choriocapillaris, with decreased fenestrae number.\",\n      \"method\": \"Immunolocalization in mouse, pig, and human eyes; LacZ reporter in Plvap-deficient mice; transmission electron microscopy\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multi-species immunolocalization and knockout EM analysis\",\n      \"pmids\": [\"23063469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PV1 is retained on the endothelial cell surface by caveolae, fenestrae, and transendothelial channels; in the absence of caveolae (caveolin-1 or cavin-1 knockout), PV1 protein is dramatically reduced due to increased internalization via a clathrin- and dynamin-independent pathway followed by lysosomal degradation, without changes in PV1 transcription or translation. This indicates that diaphragm formation is the primary cellular role of PV1.\",\n      \"method\": \"Caveolin-1 and cavin-1 knockout mice, protein level quantification, internalization assays, lysosomal inhibition, siRNA, cell fractionation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockouts combined with mechanistic internalization/degradation assays, multiple orthogonal approaches\",\n      \"pmids\": [\"22403691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PV-1 is the antigen recognized by the PAL-E antibody; PV-1 and NRP-1 form protein complexes as demonstrated by co-immunoprecipitation, connecting two molecules involved in leukocyte trafficking and angiogenesis.\",\n      \"method\": \"Flow cytometry with transfected cells, immunofluorescence, co-immunoprecipitation from tissue lysates and transfected cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP identification of PV-1/NRP-1 complex, single lab with flow cytometry confirmation of PAL-E identity\",\n      \"pmids\": [\"22627768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PLVAP is expressed in lymphatic sinus-lining endothelial cells of lymph nodes and forms physical diaphragms in transendothelial channels that act as a sieve to control size-selective entry of antigens and transmigration of lymphocytes into the lymph node parenchyma; PLVAP-deficient mice show augmented lymphocyte transmigration and loss of size-selective antigen filtering.\",\n      \"method\": \"PLVAP-deficient mouse model, intravital imaging, electron microscopy, antigen tracking experiments\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with mechanistic in vivo imaging and EM, strong phenotypic readout across multiple experimental approaches\",\n      \"pmids\": [\"25665101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PLVAP functions as a cellular receptor for Japanese Encephalitis Virus (JEV) E-glycoprotein in neurons; overexpression of PLVAP increases viral load and silencing reduces it, and PLVAP is significantly upregulated in JEV-infected mouse brain and neuro2a cells.\",\n      \"method\": \"Pull-down assay with JEV E-glycoprotein and plasma membrane fraction, 2D gel electrophoresis, mass spectrometry, PLVAP overexpression and silencing in neuro2a cells, viral load quantification, in silico docking\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pull-down plus gain/loss-of-function with viral load readout, single lab\",\n      \"pmids\": [\"30082709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PMA-induced PLVAP upregulation requires autocrine/paracrine secreted factors including VEGF-A (signaling through VEGFR2) and additional unidentified secreted molecules, acting through MEK1/Erk1/2 MAP kinase pathway; inhibition of p38, JNK, PI3K, or Akt does not block PMA-induced PLVAP upregulation.\",\n      \"method\": \"VEGF-A antibody neutralization, VEGF-A siRNA, VEGFR2 pharmacological inhibition, MEK1/Erk1/2 inhibitors, conditioned medium experiments in endothelial cells\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological and genetic inhibition approaches, single lab\",\n      \"pmids\": [\"30394679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Plvap in zebrafish hypophyseal fenestrated endothelium limits the rate of blood-borne protein passage through fenestrae; plvapb mutants show deficiencies in fenestral diaphragms and increased fenestrae density, and direct measurement of DBP-EGFP plasma protein extravasation demonstrates faster passage in mutants.\",\n      \"method\": \"Zebrafish plvapb mutants, transgenic DBP-EGFP plasma protein biosensor, live imaging quantification of extravasation, ultrastructural analysis by electron microscopy\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct functional measurement of protein passage rate in genetic mutant with in vivo biosensor and EM validation\",\n      \"pmids\": [\"31740533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VEGFA stimulates PLVAP expression in choroidal endothelial cells; loss of PLVAP disrupts the polarized structure of choriocapillaris leading to retinal degeneration, and VEGFA-PLVAP axis is required for maintenance of choriocapillaris fenestrated endothelium.\",\n      \"method\": \"Oxygen-induced retinopathy mouse model, VEGFA stimulation of choroidal endothelial cells, PLVAP knockdown, electron microscopy, expression analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro VEGFA stimulation plus in vivo loss-of-function with structural readout, single lab\",\n      \"pmids\": [\"31759628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Fenestrations in fetal liver sinusoidal endothelial cells (LSEC) contain PLVAP diaphragms, but these are lost at birth; adult LSEC express PLVAP luminally without diaphragms, and absence of PLVAP does not affect fenestrae morphology or number in adult liver sinusoids. Fetal LSEC PLVAP associates with LYVE-1, neuropilin-1 and VEGFR2 in a developmentally regulated complex.\",\n      \"method\": \"Plvap-deficient mice, multiple imaging techniques (electron microscopy, confocal), co-immunoprecipitation/association studies in fetal vs adult LSEC\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockout mice with multi-method localization and co-IP showing developmental stage-specific complexes, single lab\",\n      \"pmids\": [\"31666588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Endothelial cell-specific deletion of PV1 increases lung vascular permeability to fluid and protein, promotes albumin accumulation in caveolae bulbs, induces caveolar swelling, and increases caveolae-mediated transcytosis of albumin — all without disruption of endothelial junctions. Endotoxin exposure reduces PV1 protein expression and increases permeability by a similar mechanism.\",\n      \"method\": \"Tamoxifen-induced endothelial-specific PV1 floxed knockout (Cdh5.Cre.ERT2), permeability assays, electron microscopy with Au-albumin tracer, FRAP, LPS challenge in vivo\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional endothelial-specific knockout with multiple orthogonal mechanistic readouts and tracer studies\",\n      \"pmids\": [\"32663411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Fibronectin-integrin α5β1 signaling regulates PLVAP localization at endothelial fenestral sieve plates via microtubule stabilization; inhibition of integrin α5β1 or FAK causes microtubule depolymerization and delocalization of PLVAP from sieve plates to the Golgi apparatus, which can be rescued by paclitaxel-mediated microtubule stabilization.\",\n      \"method\": \"Pharmacological inhibition of integrin α5β1 (ATN-161), FAK inhibitor, paclitaxel, colcemid, Brefeldin A treatment; PLVAP localization by immunofluorescence in primary endothelial cells from rat pituitary anterior lobe\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological interventions with consistent mechanistic readout, single lab\",\n      \"pmids\": [\"33447878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Empagliflozin (SGLT2 inhibitor) protects glomerular endothelial cell fenestrations in diabetic mice through the VEGF-A/caveolin-1/PV-1 signaling axis; podocyte-derived VEGF-A drives abnormal endothelial caveolin-1 and PV-1 expression in diabetes, leading to loss of fenestrations and increased permeability.\",\n      \"method\": \"BTBR ob/ob mouse model, empagliflozin treatment, electron microscopy, immunohistochemistry, VEGF-A and PLVAP expression analysis\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo pharmacological intervention with mechanistic pathway analysis and EM, single lab\",\n      \"pmids\": [\"35000230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The crystal structure of an 89-amino acid segment of the PLVAP extracellular domain shows a parallel dimeric alpha-helical coiled-coil configuration with five interchain disulfide bonds; overall ~2/3 of the ~390-amino acid extracellular domain adopts helical configuration. This structural data supports the model of ~10 PLVAP dimers arranged as spokes of a bicycle wheel within each 60-80 nm diaphragm opening.\",\n      \"method\": \"X-ray crystallography (sulfur SAD phasing), circular dichroism spectroscopy, biochemical characterization of PLVAP extracellular domain segments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with biochemical validation by CD and SAD phasing, structural basis for functional model\",\n      \"pmids\": [\"36996108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLVAP upregulation in liver sinusoidal endothelial cells (LSEC) driven by the senescence-associated secretory phenotype (SASP) selectively promotes monocyte transmigration by regulating endothelial permeability through phospho-VE-cadherin expression and endothelial gap formation.\",\n      \"method\": \"SASP exposure of human LSEC, PLVAP knockdown, flow-based leukocyte transmigration assays, VE-cadherin phosphorylation analysis\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockdown with functional transmigration assay and defined molecular readout, single lab\",\n      \"pmids\": [\"37810232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The transcription factor NKX2-3 acts upstream of PLVAP and promotes its expression; NKX2-3 induction in HUVECs upregulates PLVAP (and SPARCL1), and NKX2-3 binding motifs are found in ~40% of pancreatic endothelial signature genes including PLVAP.\",\n      \"method\": \"NKX2-3 gene transfection in HUVECs, RT-qPCR, single-cell RNA-sequencing meta-analysis, DNA binding motif analysis\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with gene expression readout, supported by motif analysis, single lab\",\n      \"pmids\": [\"39445426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PV1 protein in Cav-1 null mouse lung is nearly undetectable in endothelial cells due to negative regulation by VEGF-R2 signaling; VEGF-R2 inhibition rescues PV1 protein levels without changing mRNA levels. PV1 co-immunoprecipitates with Cav-1 protein, suggesting physical association, but does not fractionate with caveolae on sucrose density gradients.\",\n      \"method\": \"Cav-1 and Cav-2 null mice, VEGF-R2 inhibitor treatment, sucrose density gradient fractionation, co-immunoprecipitation, immunofluorescence\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic null mice combined with pharmacological rescue and co-IP, single lab\",\n      \"pmids\": [\"16969073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PV1 expression in CV-1 cells reduces SV40 virus infectivity at low viral concentrations without reducing surface expression of SV40 receptors (GM1 ganglioside, MHC class I) or virus-like particle binding/internalization, suggesting PV1 acts at the level of productive endosomal trafficking rather than viral binding.\",\n      \"method\": \"PV1 overexpression in CV-1 cells, SV40 infectivity assays at multiple viral concentrations, flow cytometry for receptor expression, VLP binding and internalization assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — gain-of-function with mechanistic exclusion experiments, single lab\",\n      \"pmids\": [\"21827737\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PLVAP (PV-1) is an endothelial-specific type II transmembrane glycoprotein that forms homodimers with a parallel coiled-coil extracellular domain stabilized by interchain disulfide bonds; approximately ten PLVAP dimers assemble as radial spoke-like fibrils within each diaphragm of endothelial fenestrae, caveolae, and transendothelial channels, where they act as a size-selective permeability barrier limiting transcytosis of plasma proteins (including albumin) and regulating passage of blood-borne molecules into tissues; PLVAP expression is transcriptionally induced by VEGF-A via VEGFR2 through MEK1/Erk1/2 and PI3K/p38 MAPK signaling, by angiotensin II via AT1R/p38, and by the transcription factor NKX2-3, while its surface stability depends on caveolae (loss of caveolin-1 triggers clathrin/dynamin-independent internalization and lysosomal degradation of PLVAP); in lymphatic sinuses PLVAP forms physical diaphragms that filter antigen entry and regulate lymphocyte transmigration, and in zebrafish hypophyseal fenestrae Plvap directly limits the rate of blood-borne protein extravasation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PLVAP (PV-1) is an endothelial-specific type II transmembrane glycoprotein that serves as the essential structural component of diaphragms in fenestrae, caveolae, and transendothelial channels, functioning as a size-selective permeability barrier controlling transcellular passage of plasma proteins and immune cells. Approximately ten PLVAP homodimers, organized as parallel coiled-coil structures stabilized by interchain disulfide bonds, assemble radially as the spoke-like fibrils of each ~60–80 nm diaphragm; loss of PLVAP eliminates all diaphragms, increases caveolae-mediated albumin transcytosis, and causes vascular leakage, edema, and embryonic lethality in mice [PMID:22782339, PMID:32663411, PMID:36996108]. PLVAP expression is transcriptionally induced by VEGF-A via VEGFR2 through MEK1/Erk1/2 and PI3K/p38 MAPK pathways, by angiotensin II via AT1R/p38, and by the transcription factor NKX2-3, while its surface retention depends on caveolae—loss of caveolin-1 triggers clathrin/dynamin-independent internalization and lysosomal degradation [PMID:15155804, PMID:22403691, PMID:30394679, PMID:22012329, PMID:39445426]. In lymph node sinuses, PLVAP diaphragms physically sieve antigens by size and regulate lymphocyte transmigration into the parenchyma [PMID:25665101].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying the molecular constituent of endothelial diaphragms resolved a decades-old ultrastructural mystery: PLVAP (PV-1) was cloned as a novel homodimeric type II transmembrane glycoprotein localized specifically to stomatal diaphragms of caveolae and fenestrae across multiple organs, but absent from non-diaphragmed fenestrated endothelium.\",\n      \"evidence\": \"Immunoisolation of caveolar subfractions, cDNA cloning, EM immunolocalization in multiple rat tissues\",\n      \"pmids\": [\"10366592\", \"10557298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of PLVAP within a single diaphragm was unknown\", \"Functional consequence of PLVAP loss had not been tested\", \"Mechanism of diaphragm assembly was unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Determining whether diaphragms contain one or multiple PLVAP dimers established the multimeric spoke model: crosslinking showed multiple homodimers reside within each diaphragm, consistent with PLVAP dimers forming the radial fibrils.\",\n      \"evidence\": \"Biochemical crosslinking and immunolocalization quantifying homodimer occupancy per diaphragm\",\n      \"pmids\": [\"14630628\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise number of dimers per diaphragm was estimated, not directly measured\", \"Arrangement geometry was inferred, not resolved structurally\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing necessity and sufficiency answered whether PLVAP is the key structural determinant of diaphragm biogenesis: siRNA knockdown prevented de novo diaphragm formation while overexpression induced diaphragms even in non-endothelial cells, and PMA-stimulated induction required Erk1/2 signaling.\",\n      \"evidence\": \"siRNA knockdown and ectopic overexpression in endothelial and non-endothelial cells with EM readout, pharmacological pathway inhibition\",\n      \"pmids\": [\"15155804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream partners mediating diaphragm assembly were not identified\", \"How PLVAP expression alone is sufficient for diaphragm geometry was unexplained\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Delineating upstream signals showed VEGF-A/VEGFR2 as a transcriptional inducer of PLVAP via PI3K and p38 MAPK, linking angiogenic signaling to diaphragm biogenesis; angiotensin II was later shown to independently upregulate PLVAP through AT1R/p38.\",\n      \"evidence\": \"Pharmacological inhibitor panels and neutralizing antibodies in cultured endothelial cells; later HUVEC studies with AT1R blockade\",\n      \"pmids\": [\"15971170\", \"22012329\", \"30394679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Discrepancies between PMA-induced (ERK-dependent) and VEGF-induced (p38-dependent) pathways were not fully reconciled\", \"Transcription factor(s) directly binding the PLVAP promoter downstream of these kinases were not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connecting PLVAP to fenestral pore architecture demonstrated that PV-1 is required not only for diaphragm formation but also for the ordered arrangement of fenestrae within sieve plates, linking actin remodeling to the process.\",\n      \"evidence\": \"In vitro fenestra induction assay with pharmacological manipulation of actin dynamics and PV-1 loss-of-function, EM validation\",\n      \"pmids\": [\"17075074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between PLVAP and actin cytoskeleton was not demonstrated\", \"Whether actin remodeling is upstream or downstream of PLVAP assembly was unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Determining how caveolae control PLVAP stability revealed that in caveolin-1-null mice, PV1 is rapidly internalized via a clathrin/dynamin-independent pathway and degraded in lysosomes, showing caveolae serve as the surface retention platform for PLVAP.\",\n      \"evidence\": \"Caveolin-1 and cavin-1 knockout mice, internalization assays, lysosomal inhibition, co-IP of PV1 with caveolin-1\",\n      \"pmids\": [\"22403691\", \"16969073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The clathrin/dynamin-independent internalization pathway was not molecularly characterized\", \"Whether PV1-caveolin-1 co-IP reflects direct binding or proximity within membrane domains was unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Genetic knockout in mice provided the definitive in vivo proof that PLVAP is indispensable for all endothelial diaphragms: Plvap-null mice completely lack fenestral, caveolar, and transendothelial channel diaphragms, exhibit reduced fenestrae numbers, and die in utero or perinatally with edema, hemorrhage, and cardiac defects.\",\n      \"evidence\": \"Plvap knockout mice on C57BL/6N background, EM of multiple organs including eyes, phenotypic characterization\",\n      \"pmids\": [\"22782339\", \"23063469\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether lethality is driven primarily by vascular leak, cardiac malformation, or both was not dissected\", \"Tissue-specific rescue experiments were not performed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extending PLVAP function beyond vascular permeability, diaphragms formed by PLVAP in lymph node sinus-lining endothelium were shown to physically sieve antigens by size and regulate lymphocyte transmigration, establishing an immune-filtering role.\",\n      \"evidence\": \"PLVAP-deficient mice, intravital imaging, EM, antigen tracking in lymph nodes\",\n      \"pmids\": [\"25665101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of size selectivity (pore geometry vs charge) was not defined\", \"Whether PLVAP diaphragms actively participate in lymphocyte diapedesis signaling or act purely as a physical barrier was unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Direct measurement of plasma protein extravasation rate in zebrafish plvapb mutants provided the first quantitative in vivo demonstration that PLVAP diaphragms limit transcellular protein passage through fenestrae.\",\n      \"evidence\": \"Zebrafish plvapb mutants with transgenic DBP-EGFP plasma protein biosensor, live imaging, EM\",\n      \"pmids\": [\"31740533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PLVAP selectivity is purely steric or involves charge-based exclusion was not tested\", \"Extravasation kinetics for diverse protein sizes were not systematically measured\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional endothelial-specific deletion demonstrated that PLVAP loss specifically increases caveolae-mediated albumin transcytosis and lung vascular permeability without disrupting endothelial junctions, pinpointing the transcellular pathway as the regulated route.\",\n      \"evidence\": \"Tamoxifen-induced endothelial Plvap knockout (Cdh5.Cre.ERT2), gold-albumin tracer EM, LPS challenge\",\n      \"pmids\": [\"32663411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PLVAP loss affects transcytosis in all vascular beds equally was not assessed\", \"Mechanism by which diaphragm absence promotes caveolar swelling and increased transcytosis was not molecularly defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Fibronectin-integrin α5β1-FAK signaling was identified as a regulator of PLVAP localization at sieve plates via microtubule stabilization, revealing extracellular matrix cues control PLVAP trafficking from Golgi to fenestrae.\",\n      \"evidence\": \"Pharmacological inhibition of integrin α5β1, FAK, and microtubule dynamics in primary endothelial cells with PLVAP localization readout\",\n      \"pmids\": [\"33447878\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct interaction between microtubules and PLVAP-containing vesicles was not shown\", \"In vivo relevance of integrin-PLVAP trafficking axis was not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The crystal structure of PLVAP's extracellular domain resolved the molecular architecture: a parallel dimeric alpha-helical coiled-coil stabilized by five interchain disulfide bonds, supporting a model of ~10 dimers arranged as bicycle-wheel spokes spanning each 60–80 nm diaphragm.\",\n      \"evidence\": \"X-ray crystallography (sulfur SAD phasing) of 89 aa segment, circular dichroism of full ectodomain\",\n      \"pmids\": [\"36996108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the N-terminal hub and C-terminal tip regions connecting spokes to the rim was not resolved\", \"Full-length ectodomain structure and inter-dimer contacts within the diaphragm remain unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"NKX2-3 was identified as a transcription factor upstream of PLVAP, linking organ-specific endothelial identity programs to diaphragm biogenesis in pancreatic endothelium.\",\n      \"evidence\": \"NKX2-3 overexpression in HUVECs with RT-qPCR readout, DNA binding motif analysis in single-cell RNA-seq datasets\",\n      \"pmids\": [\"39445426\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct NKX2-3 binding to the PLVAP promoter was not demonstrated by ChIP\", \"Whether NKX2-3 is required for PLVAP expression in vivo was not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full atomic structure of an assembled diaphragm (inter-dimer contacts, hub/rim architecture), the molecular basis of size selectivity, and how tissue-specific transcription factors coordinate PLVAP expression across different vascular beds.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No complete structural model of the assembled diaphragm exists\", \"Charge versus size contributions to permeability selectivity are undefined\", \"Tissue-specific transcriptional regulation of PLVAP remains fragmentary\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 3, 4, 6, 8, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 4, 10, 18]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 7, 14, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 22]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [15, 18]}\n    ],\n    \"complexes\": [\n      \"PLVAP homodimer (diaphragm spoke)\"\n    ],\n    \"partners\": [\n      \"CAV1\",\n      \"NRP1\",\n      \"VEGFR2\",\n      \"LYVE1\",\n      \"ITGA5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}