{"gene":"STAB2","run_date":"2026-06-10T07:46:42","timeline":{"discoveries":[{"year":2000,"finding":"HARE (STAB2) was identified as the hyaluronan receptor for endocytosis in rat liver sinusoidal endothelial cells (LECs), present as 175-kDa and 300-kDa isoforms. Monoclonal antibodies against the 175-kDa protein cross-react with the 300-kDa species; two mAbs inhibit 125I-HA binding and endocytosis at 37°C. Immunofluorescence localized HARE to liver sinusoids, venous sinuses of splenic red pulp, and medullary sinuses of lymph nodes.","method":"Monoclonal antibody generation, 125I-HA binding/endocytosis inhibition assays, indirect immunofluorescence, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional inhibition with mAbs, ligand binding assays, tissue localization, replicated across subsequent papers","pmids":["10952975"],"is_preprint":false},{"year":2002,"finding":"FEEL-1 and FEEL-2 (STAB2) are endocytic receptors for advanced glycation end products (AGEs). CHO cells overexpressing FEEL-2 showed high-affinity specific binding of 125I-AGE-BSA (Kd ~1.68 µg/ml) and mediated its uptake and degradation at 37°C. Binding was inhibited by Ac-LDL and polyanionic scavenger receptor-A inhibitors (fucoidan, polyinosinic acids, dextran sulfate) but not by native LDL, oxidized LDL, or HDL.","method":"125I-AGE-BSA binding and endocytosis assays in CHO cells overexpressing FEEL-2, competition assays with scavenger receptor ligands","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ligand binding (Kd measurement), functional endocytosis assay, competition mapping, replicated in parallel with FEEL-1","pmids":["12473645"],"is_preprint":false},{"year":2003,"finding":"A blocking monoclonal antibody (mAb-174) against HARE (STAB2) almost completely inhibited 125I-HA binding to both 175-kDa and 300-kDa HARE isoforms in ligand blot assays and blocked HA clearance and metabolism by perfused excised rat livers ex vivo, demonstrating that HARE is the physiological receptor responsible for hepatic HA clearance.","method":"Ligand blot assay, ex vivo liver perfusion with recirculating 125I-HA, monoclonal antibody blocking experiments, immunohistochemistry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional blocking antibody confirmed in both cell-based and intact organ perfusion assays","pmids":["12645574"],"is_preprint":false},{"year":2003,"finding":"Recombinant rat 175-kDa HARE (STAB2 small isoform) expressed in SK-Hep-1 cells mediates specific 125I-HA endocytosis, receptor recycling, and lysosomal HA degradation. The Kd for HA binding was 4.1 nM with 160,000–220,000 binding sites per cell. The 175-kDa rHARE binds HA, dermatan sulfate, and chondroitin sulfates A, C, D, and E but not chondroitin, heparin, heparan sulfate, or keratan sulfate. GAG recognition other than HA was temperature-dependent, suggesting conformational changes alter specificity.","method":"Stable transfection in SK-Hep-1 cells, 125I-HA endocytosis assays, Kd measurement, glycosaminoglycan competition assays at 4°C and 37°C","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted recombinant receptor, quantitative binding and endocytosis assays, multiple GAG specificity tested with orthogonal temperature conditions","pmids":["12933790"],"is_preprint":false},{"year":2004,"finding":"The human 190-kDa HARE isoform (STAB2), expressed independently in Flp-In 293 cells, mediates rapid, continuous 125I-HA endocytosis and degradation with a Kd of ~7 nM and ~118,000 HA binding sites per cell. ~30–50% of total receptors are on the cell surface with a recycling time of ~8.5 min. The 190-kDa hHARE binds HA and chondroitin better than dermatan sulfate and CS types, but does not bind heparin, heparan sulfate, or keratan sulfate.","method":"Stable Flp-In 293 cell lines, 125I-HA endocytosis and degradation assays, Kd measurement, glycosaminoglycan competition assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — recombinant receptor characterization in stable cell lines, quantitative binding kinetics, ligand specificity mapping","pmids":["15208308"],"is_preprint":false},{"year":2006,"finding":"The full-length 315-kDa HARE isoform (STAB2), when stably expressed in Flp-In 293 cells, is proteolytically processed to generate the 190-kDa isoform in a ~3–4:1 ratio, mirroring processing in human spleen sinusoidal endothelial cells. Both isoforms mediate 125I-HA endocytosis and degradation. The 315-HARE ectodomain binds HA with high affinity and CS-C, CS-D, CS-E with lower affinity. The majority of each HARE isoform is intracellular, within the endocytic system, consistent with active endocytic recycling.","method":"Stable Flp-In 293 cell lines, 125I-HA endocytosis assays, ectodomain binding assays, proteolytic processing analysis, competition assays with CS types","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — recombinant full-length receptor, multiple orthogonal assays, processing mechanism confirmed in cell lines and native tissue comparison","pmids":["17145755"],"is_preprint":false},{"year":2008,"finding":"HARE (STAB2) is a systemic clearance receptor for heparin. The 190- and 315-kDa HARE isoforms specifically bind heparin (Kd ~17 nM and ~23 nM for purified ectodomains, respectively). Cells expressing HARE internalize 125I-streptavidin-biotin-heparin via clathrin-coated pit pathway (internalization inhibited >70% by hyperosmolar conditions), with a recycling time of ~12 min. Internalized heparin is delivered to lysosomes.","method":"Stable Flp-In 293 cell lines, 125I-heparin binding and endocytosis assays, purified soluble HARE ectodomains, hyperosmolarity inhibition, fluorescence microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — both soluble ectodomain and cell-based assays, quantitative Kd, mechanistic validation via clathrin pathway inhibition","pmids":["18434317"],"is_preprint":false},{"year":2008,"finding":"The cytoplasmic domain of HARE (STAB2) contains four endocytic motifs (YSYFRI, FQHF, NPLY, DPF) targeting coated pit-mediated internalization. Deletion of YSYFRI, FQHF, or NPLY decreased 125I-HA endocytosis by ~49%, ~39%, and ~56%, respectively. Deletion of DPF had no effect. Deletion of all four motifs decreased endocytosis by ~95%. Y2519A mutation in NPLY alone retained 85–90% wild-type endocytosis, but in a triple-motif deletant reduced activity to ~7%. Three motifs (YSYFRI, FQHF, NPLY) provide redundancy for coated pit targeting.","method":"Stable cell lines expressing HARE cytoplasmic domain deletion mutants and point mutants, 125I-HA endocytosis assays, HA degradation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic deletion and point mutagenesis of all four endocytic motifs with quantitative functional readouts","pmids":["18539600"],"is_preprint":false},{"year":2008,"finding":"HARE (STAB2) binding sites for different ligands are distinct and partially overlapping. HA and chondroitin sulfates A, C, D bind to overlapping sites distinct from heparin, AcLDL, dermatan sulfate, and CS-E binding sites. Heparin and HA bind simultaneously to HARE (mutually inclusive binding). Heparin binding was competed by DS, CS-E, AcLDL, and dextran sulfate but not by other CS types or HA. The Link domain was required for HARE binding to HA, CS-A, CS-C, and CS-D.","method":"Competitive endocytosis assays in 315- and 190-HARE stable cell lines, ELISA-like assays with purified 190-HARE ectodomain, biotinylated GAGs, radiolabeled ligands","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal competition assays with purified protein and cell-based endocytosis, mapping of distinct binding domains","pmids":["18499864"],"is_preprint":false},{"year":2009,"finding":"Both unfractionated heparin (UFH, Kd ~0.06 µM) and low-molecular-weight heparin (LMWH, Kd ~10 µM) are cleared by HARE/Stabilin-2. Anti-HARE antibodies specifically block uptake of LMWH and UFH by isolated rat liver sinusoidal endothelial cells and by human 293 cells expressing recombinant hHARE. UFH and LMWH cross-compete for the same binding sites. The differential affinity (UFH > LMWH) likely explains the longer in vivo circulating half-life of LMWH.","method":"Anti-HARE antibody blocking assays in rat liver SECs and recombinant hHARE 293 cells, Kd measurement, cross-competition assays, ELISA-like assays with purified 190-hHARE ectodomain","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — both native tissue (rat liver SECs) and recombinant receptor, antibody blocking, quantitative Kd, cross-competition mapping","pmids":["19359419"],"is_preprint":false},{"year":2010,"finding":"N-glycans at the Link domain N2280 site of human 190-HARE (STAB2) are required for HA binding to the purified ectodomain (N2280A mutation abolishes HA binding in ELISA, pull-down, and SPR assays showing Kd=5.2 nM for wild-type) but are NOT required for cellular HA endocytosis by membrane-bound HARE. Glycoproteomic analysis identified diverse glycan structures at 10 of 17 N-glycosylation consensus sites, with the most diversity at N2280.","method":"Site-directed mutagenesis (N2280A), stable Flp-In 293 cell lines, 125I-HA endocytosis assays, ELISA-like binding assays, surface plasmon resonance, glycoproteomic mass spectrometry","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with multiple orthogonal binding assays (ELISA, pull-down, SPR) and functional endocytosis assay, glycoproteomics","pmids":["20466649"],"is_preprint":false},{"year":2014,"finding":"A Link domain N-glycan (at N2280) in HARE (STAB2) is specifically required for HA-mediated ERK1/2 and NF-κB signaling. HARE(N2280A) cells internalize HA, heparin, AcLDL, and dermatan sulfate normally, but HA endocytosis by HARE(N2280A) fails to activate ERK1/2 or NF-κB-mediated gene expression. Heparin, AcLDL, and DS still activate NF-κB normally in HARE(N2280A) cells. HA-mediated ERK1/2 activation was HA size-dependent.","method":"Stable cell lines expressing HARE(N2280A), 125I-ligand endocytosis assays, ERK1/2 phosphorylation assays, dual-luciferase NF-κB reporter assays, IκB-α degradation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis with multiple signaling pathway readouts (ERK1/2, NF-κB, IκB-α), ligand-specific dissection of signaling mechanisms","pmids":["24942734"],"is_preprint":false},{"year":2014,"finding":"HARE (STAB2) is expressed as tissue-specific splice variants in bone marrow, lymph node, and spleen. Five splice variants were detected by RT-PCR and sequencing. Three variants were cloned into mammalian expression vectors and stable cell lines were created, confirming protein expression.","method":"RT-PCR with primers spanning splice junctions, agarose gel purification, sequencing, cloning into mammalian expression vectors, stable cell line creation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — mRNA detection and cloning with protein expression confirmed, but functional characterization of splice variants is limited in this paper","pmids":["25446080"],"is_preprint":false},{"year":2015,"finding":"HARE (STAB2) endocytosis of HA and heparin is targeted by different subsets of its three functional endocytic motifs. For heparin endocytosis, deletion of M1 (YSYFRI), M3 (NPLY), or M4 (DPF) decreased uptake; M3 was most active. A HARE cytoplasmic domain variant containing only M3 internalized both HA and heparin, whereas variants with only M2 or M4 did not internalize either ligand. Internalization was dynamin-dependent and inhibited by hyperosmolarity, confirming clathrin-mediated endocytosis.","method":"Stable cell lines expressing HARE cytoplasmic domain single-motif deletion or single-motif-only variants, 125I-HA and 125I-heparin endocytosis assays, hyperosmolarity inhibition, dynamin-dependence assays","journal":"International journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — systematic mutagenesis of all motif combinations with two distinct ligands, mechanistic confirmation via dynamin and clathrin pathway inhibition","pmids":["25883656"],"is_preprint":false},{"year":2018,"finding":"Stabilin-2 (stab2) in zebrafish liver sinusoidal endothelial cells is required for uptake of anionic nanoparticles. Using the zebrafish caudal vein model, stab2 was identified as essential for SEC-mediated nanoparticle uptake. Nanoparticle-SEC interactions were blocked by dextran sulfate, a competitive inhibitor of stab2 and other scavenger receptors.","method":"Zebrafish (Danio rerio) caudal vein model, nanoparticle uptake assays, stab2 knockdown/genetic manipulation, dextran sulfate competition","journal":"ACS nano","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic requirement for stab2 in nanoparticle uptake established in zebrafish model, confirmed by competitive inhibition, single study","pmids":["29320626"],"is_preprint":false},{"year":2020,"finding":"Rare damaging variants in STAB2 are associated with venous thromboembolism (VTE). VTE-associated variants of STAB2 showed reduced surface expression compared to reference STAB2 in cell culture. Individuals with rare STAB2 variants had higher von Willebrand factor levels, suggesting haploinsufficiency of stabilin-2 may increase VTE risk through elevated levels of procoagulants including von Willebrand factor and factor VIII.","method":"Whole-exome sequencing (393 VTE cases, 6114 controls), cell culture surface expression assays for VTE-associated STAB2 variants, von Willebrand factor measurement in independent cohort","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — cell-based surface expression assay for variant function, independent cohort VWF measurement, but mechanism linking reduced STAB2 expression to VWF elevation is inferred not directly tested","pmids":["32457982"],"is_preprint":false},{"year":2002,"finding":"HARE (STAB2) is not CD44 or ICAM-1 (CD54). Confocal fluorescence microscopy showed CD44 and ICAM-1 have cellular distributions distinct from and essentially non-overlapping with HARE in liver sinusoidal endothelial cells. An anti-HARE antibody inhibited >98% of HA uptake by cultured LECs, while antibodies against ICAM-1 or CD44 had no effect. No cross-reactivity was detected between purified HARE and CD44 or ICAM-1 antibodies by ELISA.","method":"Confocal fluorescence microscopy, antibody-blocking HA accumulation assay in rat liver LECs, ELISA with purified HARE","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (confocal localization, functional blocking, ELISA) definitively distinguishing HARE from two alternative candidate receptors","pmids":["12061795"],"is_preprint":false}],"current_model":"STAB2 (Stabilin-2/HARE) is a type I single-pass transmembrane scavenger receptor expressed in sinusoidal endothelial cells of liver, spleen, and lymph nodes that mediates clathrin-coated pit endocytosis and lysosomal degradation of multiple circulating ligands including hyaluronan, chondroitin sulfates, heparin, dermatan sulfate, advanced glycation end products, and acetylated LDL; the 315-kDa full-length isoform is proteolytically cleaved to generate a 190-kDa C-terminal isoform that contains all known ligand-binding sites, the cytoplasmic domain contains three functionally redundant endocytic motifs (YSYFRI, FQHF, NPLY) that together drive coated pit targeting, an N-glycan in the Link domain is required specifically for HA-induced ERK1/2 and NF-κB signaling but not for HA endocytosis itself, and rare loss-of-function variants in STAB2 are associated with elevated von Willebrand factor and increased venous thromboembolism risk."},"narrative":{"mechanistic_narrative":"STAB2 (Stabilin-2/HARE) is a transmembrane scavenger-clearance receptor of liver, splenic, and lymph node sinusoidal endothelial cells that mediates clathrin-coated-pit endocytosis and lysosomal degradation of circulating glycosaminoglycans and other polyanionic ligands [PMID:10952975, PMID:12645574, PMID:12061795]. It is the physiological hepatic clearance receptor for hyaluronan, demonstrated by antibody blockade of HA clearance in perfused liver, and binds HA with nanomolar affinity while recognizing a broader ligand set including chondroitin sulfates, dermatan sulfate, advanced glycation end products, acetylated LDL, and both unfractionated and low-molecular-weight heparin through distinct, partially overlapping binding sites [PMID:12473645, PMID:12645574, PMID:12933790, PMID:18434317, PMID:18499864, PMID:19359419]. The full-length 315-kDa receptor is proteolytically processed to a 190-kDa C-terminal isoform that retains all ligand-binding activity, and a Link domain is required for HA and chondroitin sulfate binding [PMID:17145755, PMID:18499864]. Internalization is driven by a cytoplasmic domain whose three functionally redundant endocytic motifs (YSYFRI, FQHF, NPLY) target the receptor to dynamin- and clathrin-dependent coated pits, with different motif subsets preferentially routing HA versus heparin uptake [PMID:18539600, PMID:25883656]. Beyond clearance, an N-glycan at the Link domain N2280 site is specifically required for HA-induced ERK1/2 and NF-κB signaling but dispensable for endocytosis itself, separating the receptor's ligand-scavenging and signaling functions [PMID:20466649, PMID:24942734]. Rare loss-of-function STAB2 variants that reduce surface expression are associated with elevated von Willebrand factor and increased venous thromboembolism risk [PMID:32457982].","teleology":[{"year":2000,"claim":"Establishing the molecular identity of the hepatic hyaluronan clearance receptor answered which sinusoidal endothelial protein removes circulating HA.","evidence":"Monoclonal antibodies, 125I-HA binding/endocytosis inhibition, and immunofluorescence in rat liver sinusoidal endothelial cells","pmids":["10952975"],"confidence":"High","gaps":["Did not define the receptor primary sequence or ligand-binding domains","Other potential ligands not yet tested"]},{"year":2002,"claim":"Demonstrating that HARE is distinct from CD44 and ICAM-1 ruled out the leading candidate HA receptors and confirmed it as the dominant endocytic HA receptor in liver endothelium.","evidence":"Confocal microscopy, antibody-blocking HA uptake assays, and ELISA with purified HARE in rat liver LECs","pmids":["12061795"],"confidence":"High","gaps":["Did not establish the molecular relationship to FEEL receptors","Signaling roles not addressed"]},{"year":2002,"claim":"Identifying FEEL-2/STAB2 as an endocytic AGE receptor extended its ligand repertoire beyond HA to scavenger-receptor-type polyanionic cargo.","evidence":"125I-AGE-BSA binding, endocytosis, and competition assays in CHO cells overexpressing FEEL-2","pmids":["12473645"],"confidence":"High","gaps":["Binding site relationship to the HA site not mapped here","In vivo AGE clearance role not tested"]},{"year":2003,"claim":"Antibody blockade in intact perfused liver established HARE as the physiological receptor responsible for hepatic HA clearance, not merely a binder.","evidence":"Ligand blot, ex vivo recirculating 125I-HA liver perfusion, and blocking mAb experiments","pmids":["12645574"],"confidence":"High","gaps":["Did not address contribution of other organs","Quantitative receptor kinetics not derived from intact organ"]},{"year":2003,"claim":"Reconstitution of the recombinant 175-kDa receptor showed it suffices for HA endocytosis, recycling, and lysosomal degradation and defined its GAG specificity.","evidence":"Stable SK-Hep-1 transfectants, 125I-HA endocytosis, Kd measurement, and GAG competition at 4°C and 37°C","pmids":["12933790"],"confidence":"High","gaps":["Temperature-dependent conformational basis of GAG specificity not structurally defined","Full-length receptor processing not addressed"]},{"year":2004,"claim":"Characterization of the human 190-kDa isoform established conserved HA endocytic kinetics and surface/recycling behavior across species.","evidence":"Stable Flp-In 293 lines, 125I-HA endocytosis/degradation, Kd, and surface fraction/recycling measurements","pmids":["15208308"],"confidence":"High","gaps":["Relationship of 190-kDa isoform to full-length precursor not yet defined","Signaling output not assessed"]},{"year":2006,"claim":"Showing the 315-kDa precursor is proteolytically processed to the 190-kDa isoform, mirroring native tissue, defined the receptor's biogenesis and that both forms are endocytically active.","evidence":"Stable full-length Flp-In 293 lines, processing analysis, 125I-HA endocytosis, and ectodomain binding assays","pmids":["17145755"],"confidence":"High","gaps":["Protease responsible for cleavage not identified","Functional consequence of the precursor/product ratio unknown"]},{"year":2008,"claim":"Systematic mutagenesis of the cytoplasmic domain identified three redundant endocytic motifs that drive coated-pit targeting, defining the internalization machinery.","evidence":"Stable cell lines with cytoplasmic motif deletion/point mutants and 125I-HA endocytosis assays","pmids":["18539600"],"confidence":"High","gaps":["Adaptor proteins binding each motif not identified","Structural basis of motif redundancy unknown"]},{"year":2008,"claim":"Mapping ligand binding sites showed distinct yet partially overlapping sites and required the Link domain for HA/CS binding, explaining multi-ligand scavenging.","evidence":"Competitive endocytosis and ELISA-like assays with purified ectodomain and radiolabeled/biotinylated GAGs","pmids":["18499864"],"confidence":"High","gaps":["Atomic-resolution structure of binding sites not determined","Stoichiometry of simultaneous heparin/HA binding not quantified"]},{"year":2008,"claim":"Identifying STAB2 as a systemic heparin clearance receptor extended its physiological role to anticoagulant pharmacokinetics.","evidence":"Stable Flp-In 293 lines, 125I-heparin binding/endocytosis, hyperosmolar clathrin-pathway inhibition, and ectodomain Kd","pmids":["18434317"],"confidence":"High","gaps":["In vivo contribution to heparin clearance not directly quantified","Lysosomal heparin processing pathway not detailed"]},{"year":2009,"claim":"Demonstrating differential clearance of UFH versus LMWH by STAB2 provided a receptor-level explanation for their differing circulating half-lives.","evidence":"Anti-HARE blocking in rat liver SECs and recombinant 293 cells, Kd measurement, and cross-competition assays","pmids":["19359419"],"confidence":"High","gaps":["Direct in vivo demonstration in STAB2-deficient animals absent","Structural determinant of UFH/LMWH affinity difference unknown"]},{"year":2010,"claim":"Identifying the N2280 Link-domain N-glycan as required for soluble HA binding but not membrane endocytosis dissociated glycan-dependent affinity from cellular uptake.","evidence":"N2280A mutagenesis, ELISA/pull-down/SPR binding, 125I-HA endocytosis, and glycoproteomic mass spectrometry","pmids":["20466649"],"confidence":"High","gaps":["Why endocytosis tolerates loss of glycan-dependent affinity unexplained","Roles of glycans at other sites not resolved"]},{"year":2014,"claim":"Showing the N2280 glycan is selectively required for HA-induced ERK1/2 and NF-κB signaling separated the receptor's signaling from its scavenging function and made it ligand-specific.","evidence":"HARE(N2280A) stable lines with 125I-ligand endocytosis, ERK1/2 phosphorylation, NF-κB reporter, and IκB-α degradation assays","pmids":["24942734"],"confidence":"High","gaps":["Downstream signaling adaptors and the transmembrane signaling mechanism not identified","Physiological consequence of HA-induced signaling in vivo unknown"]},{"year":2014,"claim":"Detection of tissue-specific splice variants raised the possibility of receptor diversity across hematopoietic and lymphoid tissues.","evidence":"RT-PCR, sequencing, cloning, and stable expression of three splice variants","pmids":["25446080"],"confidence":"Medium","gaps":["Functional differences among splice variants not characterized","Tissue-specific physiological roles untested"]},{"year":2015,"claim":"Dissecting motif usage for HA versus heparin showed distinct motif subsets route different ligands, with M3/NPLY sufficient for both, refining the endocytic logic.","evidence":"Single-motif deletion/only variants with 125I-HA and 125I-heparin endocytosis, dynamin-dependence, and hyperosmolarity inhibition","pmids":["25883656"],"confidence":"High","gaps":["Molecular basis for ligand-dependent motif selectivity unknown","Adaptor recruitment to each motif not mapped"]},{"year":2018,"claim":"Establishing stab2 as essential for sinusoidal endothelial uptake of anionic nanoparticles in vivo extended its scavenging role and connected it to nanoparticle clearance.","evidence":"Zebrafish caudal vein model with stab2 genetic manipulation and dextran sulfate competition","pmids":["29320626"],"confidence":"Medium","gaps":["Single model organism study","Direct binding of nanoparticles to STAB2 not demonstrated"]},{"year":2020,"claim":"Linking rare loss-of-function STAB2 variants to elevated von Willebrand factor and venous thromboembolism connected receptor function to a coagulation phenotype.","evidence":"Whole-exome sequencing of VTE cases/controls, cell-based surface expression of variants, and VWF measurement in an independent cohort","pmids":["32457982"],"confidence":"Medium","gaps":["Mechanism linking reduced STAB2 to VWF elevation inferred not directly tested","Whether STAB2 directly clears VWF not demonstrated"]},{"year":null,"claim":"How STAB2 transduces ligand binding into intracellular ERK1/2 and NF-κB signaling, and the structural basis of its multi-ligand binding sites, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No identified signaling adaptor or transmembrane coupling mechanism","No atomic-resolution structure of ligand-binding domains","Direct in vivo demonstration of physiological VWF/coagulant clearance lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,1,2,3,4,6]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,6]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5,6]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[3,6]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,2,6,7,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,16]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WWQ8","full_name":"Stabilin-2","aliases":["FAS1 EGF-like and X-link domain-containing adhesion molecule 2","Fasciclin, EGF-like, laminin-type EGF-like and link domain-containing scavenger receptor 2","FEEL-2","Hyaluronan receptor for endocytosis"],"length_aa":2551,"mass_kda":277.0,"function":"Phosphatidylserine receptor that enhances the engulfment of apoptotic cells. Hyaluronan receptor that binds to and mediates endocytosis of hyaluronic acid (HA). Also acts, in different species, as a primary systemic scavenger receptor for heparin (Hep), chondroitin sulfate (CS), dermatan sulfate (DS), nonglycosaminoglycan (GAG), acetylated low-density lipoprotein (AcLDL), pro-collagen propeptides and advanced glycation end products (AGE). May serve to maintain tissue integrity by supporting extracellular matrix turnover or it may contribute to maintaining fluidity of bodily liquids by resorption of hyaluronan. Counter receptor which plays an important role in lymphocyte recruitment in the hepatic vasculature. Binds to both Gram-positive and Gram-negative bacteria and may play a role in defense against bacterial infection. 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Monoclonal antibodies against the 175-kDa protein cross-react with the 300-kDa species; two mAbs inhibit 125I-HA binding and endocytosis at 37°C. Immunofluorescence localized HARE to liver sinusoids, venous sinuses of splenic red pulp, and medullary sinuses of lymph nodes.\",\n      \"method\": \"Monoclonal antibody generation, 125I-HA binding/endocytosis inhibition assays, indirect immunofluorescence, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional inhibition with mAbs, ligand binding assays, tissue localization, replicated across subsequent papers\",\n      \"pmids\": [\"10952975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FEEL-1 and FEEL-2 (STAB2) are endocytic receptors for advanced glycation end products (AGEs). CHO cells overexpressing FEEL-2 showed high-affinity specific binding of 125I-AGE-BSA (Kd ~1.68 µg/ml) and mediated its uptake and degradation at 37°C. Binding was inhibited by Ac-LDL and polyanionic scavenger receptor-A inhibitors (fucoidan, polyinosinic acids, dextran sulfate) but not by native LDL, oxidized LDL, or HDL.\",\n      \"method\": \"125I-AGE-BSA binding and endocytosis assays in CHO cells overexpressing FEEL-2, competition assays with scavenger receptor ligands\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ligand binding (Kd measurement), functional endocytosis assay, competition mapping, replicated in parallel with FEEL-1\",\n      \"pmids\": [\"12473645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A blocking monoclonal antibody (mAb-174) against HARE (STAB2) almost completely inhibited 125I-HA binding to both 175-kDa and 300-kDa HARE isoforms in ligand blot assays and blocked HA clearance and metabolism by perfused excised rat livers ex vivo, demonstrating that HARE is the physiological receptor responsible for hepatic HA clearance.\",\n      \"method\": \"Ligand blot assay, ex vivo liver perfusion with recirculating 125I-HA, monoclonal antibody blocking experiments, immunohistochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional blocking antibody confirmed in both cell-based and intact organ perfusion assays\",\n      \"pmids\": [\"12645574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Recombinant rat 175-kDa HARE (STAB2 small isoform) expressed in SK-Hep-1 cells mediates specific 125I-HA endocytosis, receptor recycling, and lysosomal HA degradation. The Kd for HA binding was 4.1 nM with 160,000–220,000 binding sites per cell. The 175-kDa rHARE binds HA, dermatan sulfate, and chondroitin sulfates A, C, D, and E but not chondroitin, heparin, heparan sulfate, or keratan sulfate. GAG recognition other than HA was temperature-dependent, suggesting conformational changes alter specificity.\",\n      \"method\": \"Stable transfection in SK-Hep-1 cells, 125I-HA endocytosis assays, Kd measurement, glycosaminoglycan competition assays at 4°C and 37°C\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted recombinant receptor, quantitative binding and endocytosis assays, multiple GAG specificity tested with orthogonal temperature conditions\",\n      \"pmids\": [\"12933790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The human 190-kDa HARE isoform (STAB2), expressed independently in Flp-In 293 cells, mediates rapid, continuous 125I-HA endocytosis and degradation with a Kd of ~7 nM and ~118,000 HA binding sites per cell. ~30–50% of total receptors are on the cell surface with a recycling time of ~8.5 min. The 190-kDa hHARE binds HA and chondroitin better than dermatan sulfate and CS types, but does not bind heparin, heparan sulfate, or keratan sulfate.\",\n      \"method\": \"Stable Flp-In 293 cell lines, 125I-HA endocytosis and degradation assays, Kd measurement, glycosaminoglycan competition assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — recombinant receptor characterization in stable cell lines, quantitative binding kinetics, ligand specificity mapping\",\n      \"pmids\": [\"15208308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The full-length 315-kDa HARE isoform (STAB2), when stably expressed in Flp-In 293 cells, is proteolytically processed to generate the 190-kDa isoform in a ~3–4:1 ratio, mirroring processing in human spleen sinusoidal endothelial cells. Both isoforms mediate 125I-HA endocytosis and degradation. The 315-HARE ectodomain binds HA with high affinity and CS-C, CS-D, CS-E with lower affinity. The majority of each HARE isoform is intracellular, within the endocytic system, consistent with active endocytic recycling.\",\n      \"method\": \"Stable Flp-In 293 cell lines, 125I-HA endocytosis assays, ectodomain binding assays, proteolytic processing analysis, competition assays with CS types\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — recombinant full-length receptor, multiple orthogonal assays, processing mechanism confirmed in cell lines and native tissue comparison\",\n      \"pmids\": [\"17145755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HARE (STAB2) is a systemic clearance receptor for heparin. The 190- and 315-kDa HARE isoforms specifically bind heparin (Kd ~17 nM and ~23 nM for purified ectodomains, respectively). Cells expressing HARE internalize 125I-streptavidin-biotin-heparin via clathrin-coated pit pathway (internalization inhibited >70% by hyperosmolar conditions), with a recycling time of ~12 min. Internalized heparin is delivered to lysosomes.\",\n      \"method\": \"Stable Flp-In 293 cell lines, 125I-heparin binding and endocytosis assays, purified soluble HARE ectodomains, hyperosmolarity inhibition, fluorescence microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — both soluble ectodomain and cell-based assays, quantitative Kd, mechanistic validation via clathrin pathway inhibition\",\n      \"pmids\": [\"18434317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The cytoplasmic domain of HARE (STAB2) contains four endocytic motifs (YSYFRI, FQHF, NPLY, DPF) targeting coated pit-mediated internalization. Deletion of YSYFRI, FQHF, or NPLY decreased 125I-HA endocytosis by ~49%, ~39%, and ~56%, respectively. Deletion of DPF had no effect. Deletion of all four motifs decreased endocytosis by ~95%. Y2519A mutation in NPLY alone retained 85–90% wild-type endocytosis, but in a triple-motif deletant reduced activity to ~7%. Three motifs (YSYFRI, FQHF, NPLY) provide redundancy for coated pit targeting.\",\n      \"method\": \"Stable cell lines expressing HARE cytoplasmic domain deletion mutants and point mutants, 125I-HA endocytosis assays, HA degradation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic deletion and point mutagenesis of all four endocytic motifs with quantitative functional readouts\",\n      \"pmids\": [\"18539600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HARE (STAB2) binding sites for different ligands are distinct and partially overlapping. HA and chondroitin sulfates A, C, D bind to overlapping sites distinct from heparin, AcLDL, dermatan sulfate, and CS-E binding sites. Heparin and HA bind simultaneously to HARE (mutually inclusive binding). Heparin binding was competed by DS, CS-E, AcLDL, and dextran sulfate but not by other CS types or HA. The Link domain was required for HARE binding to HA, CS-A, CS-C, and CS-D.\",\n      \"method\": \"Competitive endocytosis assays in 315- and 190-HARE stable cell lines, ELISA-like assays with purified 190-HARE ectodomain, biotinylated GAGs, radiolabeled ligands\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal competition assays with purified protein and cell-based endocytosis, mapping of distinct binding domains\",\n      \"pmids\": [\"18499864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Both unfractionated heparin (UFH, Kd ~0.06 µM) and low-molecular-weight heparin (LMWH, Kd ~10 µM) are cleared by HARE/Stabilin-2. Anti-HARE antibodies specifically block uptake of LMWH and UFH by isolated rat liver sinusoidal endothelial cells and by human 293 cells expressing recombinant hHARE. UFH and LMWH cross-compete for the same binding sites. The differential affinity (UFH > LMWH) likely explains the longer in vivo circulating half-life of LMWH.\",\n      \"method\": \"Anti-HARE antibody blocking assays in rat liver SECs and recombinant hHARE 293 cells, Kd measurement, cross-competition assays, ELISA-like assays with purified 190-hHARE ectodomain\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — both native tissue (rat liver SECs) and recombinant receptor, antibody blocking, quantitative Kd, cross-competition mapping\",\n      \"pmids\": [\"19359419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"N-glycans at the Link domain N2280 site of human 190-HARE (STAB2) are required for HA binding to the purified ectodomain (N2280A mutation abolishes HA binding in ELISA, pull-down, and SPR assays showing Kd=5.2 nM for wild-type) but are NOT required for cellular HA endocytosis by membrane-bound HARE. Glycoproteomic analysis identified diverse glycan structures at 10 of 17 N-glycosylation consensus sites, with the most diversity at N2280.\",\n      \"method\": \"Site-directed mutagenesis (N2280A), stable Flp-In 293 cell lines, 125I-HA endocytosis assays, ELISA-like binding assays, surface plasmon resonance, glycoproteomic mass spectrometry\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with multiple orthogonal binding assays (ELISA, pull-down, SPR) and functional endocytosis assay, glycoproteomics\",\n      \"pmids\": [\"20466649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A Link domain N-glycan (at N2280) in HARE (STAB2) is specifically required for HA-mediated ERK1/2 and NF-κB signaling. HARE(N2280A) cells internalize HA, heparin, AcLDL, and dermatan sulfate normally, but HA endocytosis by HARE(N2280A) fails to activate ERK1/2 or NF-κB-mediated gene expression. Heparin, AcLDL, and DS still activate NF-κB normally in HARE(N2280A) cells. HA-mediated ERK1/2 activation was HA size-dependent.\",\n      \"method\": \"Stable cell lines expressing HARE(N2280A), 125I-ligand endocytosis assays, ERK1/2 phosphorylation assays, dual-luciferase NF-κB reporter assays, IκB-α degradation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis with multiple signaling pathway readouts (ERK1/2, NF-κB, IκB-α), ligand-specific dissection of signaling mechanisms\",\n      \"pmids\": [\"24942734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HARE (STAB2) is expressed as tissue-specific splice variants in bone marrow, lymph node, and spleen. Five splice variants were detected by RT-PCR and sequencing. Three variants were cloned into mammalian expression vectors and stable cell lines were created, confirming protein expression.\",\n      \"method\": \"RT-PCR with primers spanning splice junctions, agarose gel purification, sequencing, cloning into mammalian expression vectors, stable cell line creation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — mRNA detection and cloning with protein expression confirmed, but functional characterization of splice variants is limited in this paper\",\n      \"pmids\": [\"25446080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HARE (STAB2) endocytosis of HA and heparin is targeted by different subsets of its three functional endocytic motifs. For heparin endocytosis, deletion of M1 (YSYFRI), M3 (NPLY), or M4 (DPF) decreased uptake; M3 was most active. A HARE cytoplasmic domain variant containing only M3 internalized both HA and heparin, whereas variants with only M2 or M4 did not internalize either ligand. Internalization was dynamin-dependent and inhibited by hyperosmolarity, confirming clathrin-mediated endocytosis.\",\n      \"method\": \"Stable cell lines expressing HARE cytoplasmic domain single-motif deletion or single-motif-only variants, 125I-HA and 125I-heparin endocytosis assays, hyperosmolarity inhibition, dynamin-dependence assays\",\n      \"journal\": \"International journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — systematic mutagenesis of all motif combinations with two distinct ligands, mechanistic confirmation via dynamin and clathrin pathway inhibition\",\n      \"pmids\": [\"25883656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Stabilin-2 (stab2) in zebrafish liver sinusoidal endothelial cells is required for uptake of anionic nanoparticles. Using the zebrafish caudal vein model, stab2 was identified as essential for SEC-mediated nanoparticle uptake. Nanoparticle-SEC interactions were blocked by dextran sulfate, a competitive inhibitor of stab2 and other scavenger receptors.\",\n      \"method\": \"Zebrafish (Danio rerio) caudal vein model, nanoparticle uptake assays, stab2 knockdown/genetic manipulation, dextran sulfate competition\",\n      \"journal\": \"ACS nano\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic requirement for stab2 in nanoparticle uptake established in zebrafish model, confirmed by competitive inhibition, single study\",\n      \"pmids\": [\"29320626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rare damaging variants in STAB2 are associated with venous thromboembolism (VTE). VTE-associated variants of STAB2 showed reduced surface expression compared to reference STAB2 in cell culture. Individuals with rare STAB2 variants had higher von Willebrand factor levels, suggesting haploinsufficiency of stabilin-2 may increase VTE risk through elevated levels of procoagulants including von Willebrand factor and factor VIII.\",\n      \"method\": \"Whole-exome sequencing (393 VTE cases, 6114 controls), cell culture surface expression assays for VTE-associated STAB2 variants, von Willebrand factor measurement in independent cohort\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — cell-based surface expression assay for variant function, independent cohort VWF measurement, but mechanism linking reduced STAB2 expression to VWF elevation is inferred not directly tested\",\n      \"pmids\": [\"32457982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HARE (STAB2) is not CD44 or ICAM-1 (CD54). Confocal fluorescence microscopy showed CD44 and ICAM-1 have cellular distributions distinct from and essentially non-overlapping with HARE in liver sinusoidal endothelial cells. An anti-HARE antibody inhibited >98% of HA uptake by cultured LECs, while antibodies against ICAM-1 or CD44 had no effect. No cross-reactivity was detected between purified HARE and CD44 or ICAM-1 antibodies by ELISA.\",\n      \"method\": \"Confocal fluorescence microscopy, antibody-blocking HA accumulation assay in rat liver LECs, ELISA with purified HARE\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (confocal localization, functional blocking, ELISA) definitively distinguishing HARE from two alternative candidate receptors\",\n      \"pmids\": [\"12061795\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STAB2 (Stabilin-2/HARE) is a type I single-pass transmembrane scavenger receptor expressed in sinusoidal endothelial cells of liver, spleen, and lymph nodes that mediates clathrin-coated pit endocytosis and lysosomal degradation of multiple circulating ligands including hyaluronan, chondroitin sulfates, heparin, dermatan sulfate, advanced glycation end products, and acetylated LDL; the 315-kDa full-length isoform is proteolytically cleaved to generate a 190-kDa C-terminal isoform that contains all known ligand-binding sites, the cytoplasmic domain contains three functionally redundant endocytic motifs (YSYFRI, FQHF, NPLY) that together drive coated pit targeting, an N-glycan in the Link domain is required specifically for HA-induced ERK1/2 and NF-κB signaling but not for HA endocytosis itself, and rare loss-of-function variants in STAB2 are associated with elevated von Willebrand factor and increased venous thromboembolism risk.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STAB2 (Stabilin-2/HARE) is a transmembrane scavenger-clearance receptor of liver, splenic, and lymph node sinusoidal endothelial cells that mediates clathrin-coated-pit endocytosis and lysosomal degradation of circulating glycosaminoglycans and other polyanionic ligands [#0, #2, #16]. It is the physiological hepatic clearance receptor for hyaluronan, demonstrated by antibody blockade of HA clearance in perfused liver, and binds HA with nanomolar affinity while recognizing a broader ligand set including chondroitin sulfates, dermatan sulfate, advanced glycation end products, acetylated LDL, and both unfractionated and low-molecular-weight heparin through distinct, partially overlapping binding sites [#1, #2, #3, #6, #8, #9]. The full-length 315-kDa receptor is proteolytically processed to a 190-kDa C-terminal isoform that retains all ligand-binding activity, and a Link domain is required for HA and chondroitin sulfate binding [#5, #8]. Internalization is driven by a cytoplasmic domain whose three functionally redundant endocytic motifs (YSYFRI, FQHF, NPLY) target the receptor to dynamin- and clathrin-dependent coated pits, with different motif subsets preferentially routing HA versus heparin uptake [#7, #13]. Beyond clearance, an N-glycan at the Link domain N2280 site is specifically required for HA-induced ERK1/2 and NF-\\u03baB signaling but dispensable for endocytosis itself, separating the receptor's ligand-scavenging and signaling functions [#10, #11]. Rare loss-of-function STAB2 variants that reduce surface expression are associated with elevated von Willebrand factor and increased venous thromboembolism risk [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing the molecular identity of the hepatic hyaluronan clearance receptor answered which sinusoidal endothelial protein removes circulating HA.\",\n      \"evidence\": \"Monoclonal antibodies, 125I-HA binding/endocytosis inhibition, and immunofluorescence in rat liver sinusoidal endothelial cells\",\n      \"pmids\": [\"10952975\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the receptor primary sequence or ligand-binding domains\", \"Other potential ligands not yet tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that HARE is distinct from CD44 and ICAM-1 ruled out the leading candidate HA receptors and confirmed it as the dominant endocytic HA receptor in liver endothelium.\",\n      \"evidence\": \"Confocal microscopy, antibody-blocking HA uptake assays, and ELISA with purified HARE in rat liver LECs\",\n      \"pmids\": [\"12061795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the molecular relationship to FEEL receptors\", \"Signaling roles not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying FEEL-2/STAB2 as an endocytic AGE receptor extended its ligand repertoire beyond HA to scavenger-receptor-type polyanionic cargo.\",\n      \"evidence\": \"125I-AGE-BSA binding, endocytosis, and competition assays in CHO cells overexpressing FEEL-2\",\n      \"pmids\": [\"12473645\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site relationship to the HA site not mapped here\", \"In vivo AGE clearance role not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Antibody blockade in intact perfused liver established HARE as the physiological receptor responsible for hepatic HA clearance, not merely a binder.\",\n      \"evidence\": \"Ligand blot, ex vivo recirculating 125I-HA liver perfusion, and blocking mAb experiments\",\n      \"pmids\": [\"12645574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address contribution of other organs\", \"Quantitative receptor kinetics not derived from intact organ\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Reconstitution of the recombinant 175-kDa receptor showed it suffices for HA endocytosis, recycling, and lysosomal degradation and defined its GAG specificity.\",\n      \"evidence\": \"Stable SK-Hep-1 transfectants, 125I-HA endocytosis, Kd measurement, and GAG competition at 4\\u00b0C and 37\\u00b0C\",\n      \"pmids\": [\"12933790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Temperature-dependent conformational basis of GAG specificity not structurally defined\", \"Full-length receptor processing not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Characterization of the human 190-kDa isoform established conserved HA endocytic kinetics and surface/recycling behavior across species.\",\n      \"evidence\": \"Stable Flp-In 293 lines, 125I-HA endocytosis/degradation, Kd, and surface fraction/recycling measurements\",\n      \"pmids\": [\"15208308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship of 190-kDa isoform to full-length precursor not yet defined\", \"Signaling output not assessed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing the 315-kDa precursor is proteolytically processed to the 190-kDa isoform, mirroring native tissue, defined the receptor's biogenesis and that both forms are endocytically active.\",\n      \"evidence\": \"Stable full-length Flp-In 293 lines, processing analysis, 125I-HA endocytosis, and ectodomain binding assays\",\n      \"pmids\": [\"17145755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease responsible for cleavage not identified\", \"Functional consequence of the precursor/product ratio unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Systematic mutagenesis of the cytoplasmic domain identified three redundant endocytic motifs that drive coated-pit targeting, defining the internalization machinery.\",\n      \"evidence\": \"Stable cell lines with cytoplasmic motif deletion/point mutants and 125I-HA endocytosis assays\",\n      \"pmids\": [\"18539600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor proteins binding each motif not identified\", \"Structural basis of motif redundancy unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapping ligand binding sites showed distinct yet partially overlapping sites and required the Link domain for HA/CS binding, explaining multi-ligand scavenging.\",\n      \"evidence\": \"Competitive endocytosis and ELISA-like assays with purified ectodomain and radiolabeled/biotinylated GAGs\",\n      \"pmids\": [\"18499864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of binding sites not determined\", \"Stoichiometry of simultaneous heparin/HA binding not quantified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying STAB2 as a systemic heparin clearance receptor extended its physiological role to anticoagulant pharmacokinetics.\",\n      \"evidence\": \"Stable Flp-In 293 lines, 125I-heparin binding/endocytosis, hyperosmolar clathrin-pathway inhibition, and ectodomain Kd\",\n      \"pmids\": [\"18434317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution to heparin clearance not directly quantified\", \"Lysosomal heparin processing pathway not detailed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating differential clearance of UFH versus LMWH by STAB2 provided a receptor-level explanation for their differing circulating half-lives.\",\n      \"evidence\": \"Anti-HARE blocking in rat liver SECs and recombinant 293 cells, Kd measurement, and cross-competition assays\",\n      \"pmids\": [\"19359419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct in vivo demonstration in STAB2-deficient animals absent\", \"Structural determinant of UFH/LMWH affinity difference unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying the N2280 Link-domain N-glycan as required for soluble HA binding but not membrane endocytosis dissociated glycan-dependent affinity from cellular uptake.\",\n      \"evidence\": \"N2280A mutagenesis, ELISA/pull-down/SPR binding, 125I-HA endocytosis, and glycoproteomic mass spectrometry\",\n      \"pmids\": [\"20466649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why endocytosis tolerates loss of glycan-dependent affinity unexplained\", \"Roles of glycans at other sites not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing the N2280 glycan is selectively required for HA-induced ERK1/2 and NF-\\u03baB signaling separated the receptor's signaling from its scavenging function and made it ligand-specific.\",\n      \"evidence\": \"HARE(N2280A) stable lines with 125I-ligand endocytosis, ERK1/2 phosphorylation, NF-\\u03baB reporter, and I\\u03baB-\\u03b1 degradation assays\",\n      \"pmids\": [\"24942734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling adaptors and the transmembrane signaling mechanism not identified\", \"Physiological consequence of HA-induced signaling in vivo unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Detection of tissue-specific splice variants raised the possibility of receptor diversity across hematopoietic and lymphoid tissues.\",\n      \"evidence\": \"RT-PCR, sequencing, cloning, and stable expression of three splice variants\",\n      \"pmids\": [\"25446080\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional differences among splice variants not characterized\", \"Tissue-specific physiological roles untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Dissecting motif usage for HA versus heparin showed distinct motif subsets route different ligands, with M3/NPLY sufficient for both, refining the endocytic logic.\",\n      \"evidence\": \"Single-motif deletion/only variants with 125I-HA and 125I-heparin endocytosis, dynamin-dependence, and hyperosmolarity inhibition\",\n      \"pmids\": [\"25883656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for ligand-dependent motif selectivity unknown\", \"Adaptor recruitment to each motif not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Establishing stab2 as essential for sinusoidal endothelial uptake of anionic nanoparticles in vivo extended its scavenging role and connected it to nanoparticle clearance.\",\n      \"evidence\": \"Zebrafish caudal vein model with stab2 genetic manipulation and dextran sulfate competition\",\n      \"pmids\": [\"29320626\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single model organism study\", \"Direct binding of nanoparticles to STAB2 not demonstrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linking rare loss-of-function STAB2 variants to elevated von Willebrand factor and venous thromboembolism connected receptor function to a coagulation phenotype.\",\n      \"evidence\": \"Whole-exome sequencing of VTE cases/controls, cell-based surface expression of variants, and VWF measurement in an independent cohort\",\n      \"pmids\": [\"32457982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking reduced STAB2 to VWF elevation inferred not directly tested\", \"Whether STAB2 directly clears VWF not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How STAB2 transduces ligand binding into intracellular ERK1/2 and NF-\\u03baB signaling, and the structural basis of its multi-ligand binding sites, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No identified signaling adaptor or transmembrane coupling mechanism\", \"No atomic-resolution structure of ligand-binding domains\", \"Direct in vivo demonstration of physiological VWF/coagulant clearance lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 6]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 6]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [3, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2, 6, 7, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}