{"gene":"SELP","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":1985,"finding":"GMP-140 (SELP) is stored in alpha-granule membranes of resting platelets and is rapidly redistributed to the plasma membrane upon thrombin stimulation, as shown by immunocytochemical localization with immunogold probes on frozen thin sections and permeabilized platelets.","method":"Immunocytochemistry (immunogold electron microscopy, saponin permeabilization, polyclonal antibody labeling)","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct subcellular localization by immunogold EM, replicated across multiple labs in subsequent years","pmids":["2411738"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) cDNA-derived primary structure predicts a multi-domain protein with an N-terminal lectin domain, an EGF-like domain, nine tandem complement-binding consensus repeats, a transmembrane domain, and a short cytoplasmic tail; some cDNAs also predict a soluble alternatively spliced form lacking the transmembrane domain.","method":"cDNA cloning and sequence analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — primary sequence determination from cDNA, foundational structural finding replicated by multiple labs","pmids":["2466574"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) is synthesized by vascular endothelial cells and localizes to Weibel-Palade bodies (co-localizing with von Willebrand factor), from which it redistributes to the plasma membrane upon histamine stimulation.","method":"Immunoperoxidase tissue staining, [35S]cysteine metabolic labeling, double-label immunogold electron microscopy on frozen thin sections, cell stimulation assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (metabolic labeling, immunogold EM, co-localization with vWf), replicated by independent labs","pmids":["2472431","2467701"],"is_preprint":false},{"year":1989,"finding":"PADGEM/GMP-140 (SELP) on activated platelets mediates Ca2+-dependent adhesion to neutrophils, monocytes, HL60 cells, and U937 cells; this interaction is blocked by anti-PADGEM antibodies and EDTA but not by antibodies to GPIIb-IIIa, thrombospondin, or GPIV.","method":"Cell adhesion assay, antibody blocking, lipid vesicle binding assay, EDTA inhibition","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional adhesion assay with specific blocking antibodies, reconstitution with purified protein in vesicles, replicated across multiple labs","pmids":["2478294","1688717"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) is a cysteine-rich, heavily glycosylated protein (28.8% carbohydrate by weight, predominantly N-linked); N-linked oligosaccharides account for more than 50 kDa of apparent molecular weight, and the bulk of the protein mass is extracytoplasmic.","method":"Amino acid composition analysis, enzymatic deglycosylation (PNGase/Endo H), pulse-chase biosynthetic labeling in HEL cells, protease surface accessibility assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical characterization with enzymatic digestion and pulse-chase in megakaryocytic cells, multiple orthogonal methods in one study","pmids":["2463989"],"is_preprint":false},{"year":1990,"finding":"GMP-140 (SELP) expressed on the surface of activated endothelial cells mediates rapid adhesion of neutrophils; this adhesion requires extracellular Ca2+ but not active neutrophil metabolism, and is inhibited by anti-GMP-140 antibodies.","method":"COS cell transfection with GMP-140 cDNA, cell adhesion assay, antibody blocking, purified protein coating on microtiter plates","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function transfection, purified protein reconstitution, and antibody inhibition, highly cited and replicated","pmids":["1689464"],"is_preprint":false},{"year":1990,"finding":"PADGEM/GMP-140 (SELP) recognizes the carbohydrate antigen CD15 (lacto-N-fucopentaose III, Lewis x) on neutrophils and monocytes as part of its ligand; anti-CD15 antibodies and the free carbohydrate inhibit PADGEM-mediated cell adhesion.","method":"Antibody blocking assay, carbohydrate inhibition of cell adhesion, COS cell transfection adhesion assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal blocking approaches (antibody, free carbohydrate, transfectant assay), replicated by other labs","pmids":["1699666"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) co-expressed with platelet-activating factor (PAF) on histamine- or thrombin-stimulated endothelial cells acts cooperatively: GMP-140 tethers PMNs to the endothelium without requiring CD11/CD18 integrin activation, while PAF activates CD11/CD18-dependent firm adhesion. GMP-140 tethering potentiates PMN response to PAF by a mechanism distal to the PAF receptor.","method":"Cell adhesion assay, antibody blocking (anti-GMP-140, anti-CD11/CD18), soluble GMP-140 competition, histamine/thrombin EC stimulation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple blocking reagents, pathway dissection with integrin antibodies, single lab but several orthogonal perturbations","pmids":["1717478"],"is_preprint":false},{"year":1991,"finding":"Neutrophil L-selectin (LECAM-1) is modified with sialyl Lewis x and presents this oligosaccharide ligand to GMP-140 (SELP) on activated endothelium; LECAM-1 is concentrated on PMN microvilli. Anti-LECAM-1 antibodies or removal of LECAM-1 inhibits PMN binding to GMP-140 transfectants by up to 70%.","method":"Flow cytometry, anti-LECAM-1 antibody blocking, selective cell-surface removal of LECAM-1, adhesion assay on GMP-140-transfected cells","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — antibody blocking plus selective molecule removal, functional adhesion assay with transfectants","pmids":["1716182"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP; CD62) and ELAM-1 both recognize sialyl Lewis x (Neu5Ac-α2-3-Gal-β1-4-(Fuc-α1-3)-GlcNAc) as a carbohydrate ligand on myeloid and non-myeloid cells; sialic acid is required for recognition.","method":"Binding assay with purified GMP-140, cells expressing cloned glycosyltransferases, neuraminidase treatment, sialyl Lewis x-expressing cell lines","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — purified protein binding, enzymatic sialic acid removal, glycosyltransferase transfectants, confirmed by multiple labs","pmids":["1712483","1717488"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) binds to a protease-sensitive, sialic acid-containing glycoprotein receptor on neutrophils in a Ca2+-dependent, reversible, and saturable manner (Kd ~1.5 nM, ~3–6 nM for saturation). Treatment with neuraminidase (cleaving α2-3 and α2-8 sialic acids) diminishes binding, implicating sialylated glycoprotein as receptor.","method":"Radioligand binding assay ([125I]-GMP-140), protease treatment, neuraminidase treatment, Ca2+ chelation, PMA stimulation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative in vitro binding assay with pharmacological and enzymatic dissection, single lab but multiple orthogonal perturbations","pmids":["1704009"],"is_preprint":false},{"year":1991,"finding":"Oxygen radicals (H2O2, t-butylhydroperoxide, menadione) induce prolonged surface expression of GMP-140 (SELP) on endothelial cells, which mediates PMN adhesion; this occurs without new protein synthesis and requires intracellular iron (inhibited by iron chelators). Anti-GMP-140 antibody or soluble GMP-140 completely blocks PMN adhesion to oxidant-treated endothelium.","method":"PMN adhesion assay, antibody blocking, protein synthesis inhibition, antioxidant and iron chelator treatment, flow cytometry for GMP-140 surface expression","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mechanism dissected with multiple inhibitors and antibody blocking, specific to GMP-140 pathway","pmids":["1704376"],"is_preprint":false},{"year":1991,"finding":"CD62/GMP-140 (SELP) binds sulfatides (3-sulfated galactosyl ceramides) on granulocytes and tumor cell plasma membranes; this represents a distinct ligand from sialyl Lewis x. Granulocytes excrete sulfatides, potentially facilitating disengagement from CD62 upon exiting the bloodstream.","method":"Binding assay with soluble CD62-IgG fusion protein, sulfatide-coated plastic, tumor cell and granulocyte adhesion assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vitro binding assay with purified ligand and chimeric protein, multiple cell types tested","pmids":["1717159"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) binding to neutrophils is inhibited by sulfated glycans (heparin, fucoidan, dextran sulfate-500,000) but not by chondroitin sulfates. Fluid-phase GMP-140 exists predominantly as a tetramer. This suggests that the sulfated glycan binding site and the neutrophil receptor binding site on GMP-140 are identical or proximal.","method":"Radioligand binding assay ([125I]-GMP-140), rosetting assay, sulfated glycan competition","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — competitive inhibition binding assay, single lab, pharmacological inference about site proximity","pmids":["1706335"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) is also present on platelet dense granule membranes (in addition to alpha-granules), as shown by immunoelectron microscopy double-labeling with granulophysin; after thrombin stimulation, GMP-140 redistributes from dense granule membranes to the plasma membrane.","method":"Immunoelectron microscopy (immunogold), double-labeling with anti-GMP-140 and anti-granulophysin antibodies, serotonin release assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — immunogold EM double-labeling, single lab","pmids":["1377048"],"is_preprint":false},{"year":1991,"finding":"Soluble (fluid-phase) GMP-140 (SELP) inhibits CD18-dependent adhesion of TNF-α-activated neutrophils to resting endothelium, while immobilized GMP-140 supports neutrophil adhesion independently of CD18; soluble GMP-140 also inhibits superoxide anion production by neutrophils stimulated with TNF-α or fMLP.","method":"Neutrophil adhesion assay on coated plastic or endothelium, superoxide anion measurement, soluble protein competition, anti-GMP-140 Fab blockade","journal":"Science; Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional assays with purified protein (immobilized vs. soluble), antibody Fab blockade, replicated across two labs","pmids":["1696029","1706523"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) binds to a glycoprotein ligand on myeloid cells (apparent Mr ~250,000 non-reduced, ~120,000 reduced) identified by [125I]-P-selectin blotting and affinity chromatography; binding is Ca2+-dependent, blocked by anti-P-selectin mAbs, sialidase-sensitive (prolonged digestion abolishes binding), and the ligand is not L-selectin, lamp-1, lamp-2, or leukosialin.","method":"Radioligand blotting ([125I]-P-selectin), affinity chromatography, neuraminidase treatment, immunodepletion, Western blot","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct biochemical identification of ligand by affinity chromatography and radioligand blotting, multiple exclusion experiments","pmids":["1378449"],"is_preprint":false},{"year":1992,"finding":"The cytoplasmic domain of P-selectin (SELP) is both necessary and sufficient for sorting into the regulated secretory pathway. The last 23 amino acids of the 35-residue cytoplasmic tail are required; deletion of this region re-routes P-selectin to the plasma membrane in AtT20 cells. Replacement of the cytoplasmic tail of tissue factor with the P-selectin cytoplasmic domain redirects tissue factor to secretory granules.","method":"cDNA transfection into AtT20, COS-7, and CHO cells; immunogold electron microscopy; cytoplasmic tail deletion mutants; chimeric protein construction; agonist (8-Br-cAMP) stimulation","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — domain deletion mutagenesis and chimeric protein approach with direct subcellular localization by immunogold EM, gain- and loss-of-function in multiple cell lines","pmids":["1378326"],"is_preprint":false},{"year":1992,"finding":"Key residues in the lectin domain of P-selectin (SELP) required for myeloid cell binding are Lys113, Tyr48, and Tyr94, located in a shallow groove formed by the β2, β3, and β5 strands. Single alanine or phenylalanine substitutions at these positions abolish binding to myeloid cells.","method":"3D homology modeling based on rat mannose-binding protein crystal structure, site-directed mutagenesis, cell binding assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with functional cell-binding readout, supported by structural model","pmids":["7681324"],"is_preprint":false},{"year":1992,"finding":"Soluble GMP-140 (SELP) circulates as a monomer in plasma (not tetramer as in platelet membrane form), is detectable at ~0.2–0.25 µg/mL in normal plasma, and binds the same neutrophil receptor as membrane-bound GMP-140 with equivalent functional activity. Its plasma origin is consistent with alternative mRNA splicing to produce a form lacking the transmembrane domain.","method":"Ultracentrifugation (100,000g), ELISA, protein purification from plasma, analytical gel filtration, neutrophil binding assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical purification and characterization, functional neutrophil binding confirmation, multiple orthogonal methods","pmids":["1372646"],"is_preprint":false},{"year":1992,"finding":"P-selectin (SELP) on activated platelets induces superoxide anion release by monocytes and neutrophils; this effect is inhibited by anti-P-selectin antibody, anti-sialyl-Lewis X antibody, or soluble recombinant P-selectin, and requires membrane contact (not soluble platelet secretion products).","method":"Superoxide anion measurement, thrombin-activated platelet membranes, antibody blocking, soluble recombinant P-selectin competition","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional assay with antibody and recombinant protein blocking, single lab","pmids":["7690799"],"is_preprint":false},{"year":1992,"finding":"P-selectin (SELP) binds to a glycoprotein ligand on carcinoma cells (colon, lung, breast) that is distinct from the myeloid cell ligand: neuraminidase treatment of a breast carcinoma cell line does not abolish GMP-140 binding (unlike HL-60 cells where sialic acid is essential), indicating tumor cells present a different P-selectin ligand.","method":"Immunohistology with GMP-140-IgG chimera on tissue sections, neuraminidase treatment, cell-line binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — chimeric protein binding assay on tissue sections and cell lines with enzymatic perturbation, single lab","pmids":["1372439"],"is_preprint":false},{"year":1992,"finding":"P-selectin (SELP; CD62) binds to subpopulations of memory T lymphocytes (CD45RO+ CD4+ and CD8+) and NK cells (CD16+) in a Ca2+-dependent, sialidase-sensitive manner, and can mediate adhesion of activated platelets to these lymphocyte subsets.","method":"Multi-color flow cytometry with purified P-selectin, Ca2+ dependence, neuraminidase treatment, platelet-lymphocyte rosetting assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding assay with purified protein on cell subsets, Ca2+ and enzyme dependence shown, single lab","pmids":["1378721"],"is_preprint":false},{"year":1992,"finding":"P-selectin (SELP) binds to chronically antigen-stimulated CD4+ T cells (but not freshly isolated CD4+ T cells); binding requires sialic acid (abolished by neuraminidase) and is Ca2+-dependent, and is blocked by dextran sulfate, fucoidan, and heparin. P-selectin modulates cytokine production (augments GM-CSF, inhibits IL-8) in primed T cells.","method":"P-selectin-IgG fusion protein binding assay by flow cytometry, neuraminidase treatment, sulfated glycan inhibition, cytokine measurement (ELISA)","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — binding and functional cytokine assay with genetically engineered fusion protein, single lab","pmids":["1378017"],"is_preprint":false},{"year":1994,"finding":"The myeloid cell binding site and the sulfatide binding site of P-selectin (SELP) lectin domain are overlapping; conservative substitutions Tyr48Ser or Lys113Arg produce correctly folded P-selectin mutants that fail to bind HL-60 cells, establishing that the exact stereochemistry of these residues is critical.","method":"Site-directed mutagenesis, cell binding assay (HL-60 cells), sulfatide binding assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with multiple substitutions, direct functional readout, builds on prior structural model","pmids":["7508745"],"is_preprint":false},{"year":1989,"finding":"Complement C5b-9 triggers translocation of GMP-140 (SELP) to the endothelial cell surface and secretion of vWF; this requires C9 deposition, causes Ca2+ influx from external medium, and is partially inhibited by the protein kinase inhibitor sphingosine.","method":"C5b-9 complement deposition assay, immunofluorescence for GMP-140 surface expression, cytosolic Ca2+ measurement, C8-deficient serum controls, protein kinase inhibition","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mechanistic dissection of signaling (Ca2+ influx, PKC) with pharmacological inhibitors, single lab","pmids":["2470750"],"is_preprint":false},{"year":2016,"finding":"MicroRNAs miR-26b and miR-140 directly regulate SELP mRNA levels in megakaryocytes; experimental overexpression or inhibition of these miRNAs in MEG-01 cells correspondingly changes SELP mRNA levels. Hyperglycemia suppresses these miRNAs, leading to elevated SELP mRNA and increased platelet P-selectin surface expression.","method":"miRNA mimic/anti-miRNA transfection in MEG-01 megakaryocytic cells, RT-qPCR for SELP mRNA, flow cytometry for surface P-selectin, calpain inhibition to restore miRNA","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct miRNA gain/loss-of-function with mRNA readout in megakaryocytic cell line, single lab","pmids":["27975100"],"is_preprint":false},{"year":2020,"finding":"ADP-activated expression of CD62P (P-selectin/SELP) from platelet granules requires co-activation of both P2Y1 and P2Y12 receptors. The P2Y12 receptor activates PI3K (demonstrated by Akt1 phosphorylation assay), while P2Y1 activation creates high cytosolic Ca2+ required for optimal PI3K activity. Inhibition of PLC, IP3 receptor, or PI3K (wortmannin) almost completely blocks ADP-induced CD62P surface expression.","method":"Selective P2Y1/P2Y12 receptor antagonists (MRS2500, PSB0739), pharmacological inhibitors (U73122, 2-APB, calmidazolium, wortmannin), flow cytometry for CD62P, Akt1 phosphorylation assay in platelet lysates","journal":"Pharmaceuticals","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple selective pharmacological inhibitors with functional readouts, single lab","pmids":["33255391"],"is_preprint":false},{"year":2024,"finding":"P-selectin (SELP/CD62P) on platelets activates infiltrating neutrophils and Ly6Chigh monocytes during venous thrombus resolution; P-selectin blocking antibody reduces platelet-neutrophil and platelet-monocyte aggregates, decreases oxidative burst in the thrombus, lowers tissue factor expression in the vessel wall, reduces thrombus density, and increases urokinase-type plasminogen activator levels, accelerating fibrin degradation and thrombus volume reduction.","method":"Mouse inferior vena cava stenosis model, P-selectin blocking antibody, flow cytometry for platelet-leukocyte aggregates, scanning electron microscopy, ROS measurement, tissue factor expression analysis, uPA quantification, intravital imaging","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with blocking antibody plus in vitro mechanistic experiments, multiple orthogonal readouts, single lab","pmids":["38385292"],"is_preprint":false},{"year":2006,"finding":"Platelet CD62P (P-selectin/SELP) forms a complex with TLR4 on the platelet membrane and cooperates with TLR4 in binding EHEC LPS to platelets, contributing to platelet activation; TLR4-deficient mice fail to bind O157LPS and show preserved platelet counts after LPS injection.","method":"Co-localization of TLR4 and CD62P by immunofluorescence, TLR4 knockout mice (C57BL/10ScN), in vitro and in vivo LPS binding, flow cytometry for CD40L and GPIIb/IIIa activation, perfusion assay on endothelial cells with TLR4/CD62 blocking antibodies","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model plus antibody blocking and co-localization, single lab but multiple orthogonal approaches","pmids":["16514062"],"is_preprint":false}],"current_model":"P-selectin (SELP/GMP-140/CD62P/PADGEM) is a multi-domain (lectin-EGF-complement repeat-transmembrane) Ca2+-dependent lectin stored in platelet alpha-granules and endothelial Weibel-Palade bodies; its cytoplasmic tail is necessary and sufficient for sorting to regulated secretory granules. Upon cellular activation, it is rapidly translocated to the plasma membrane where its lectin domain binds sialylated, fucosylated carbohydrate ligands (principally sialyl Lewis x) and sulfatides on myeloid leukocytes—with key binding residues Lys113, Tyr48, and Tyr94—thereby mediating tethering and rolling of neutrophils, monocytes, and subsets of lymphocytes and hematopoietic progenitors to activated platelets and endothelium, cooperating with PAF for integrin-dependent firm adhesion, activating leukocyte oxidative burst and tissue factor expression, and playing a role in thrombus resolution; a soluble, alternatively spliced monomeric form circulates in plasma and can exert anti-inflammatory effects by inhibiting CD18-dependent neutrophil adhesion."},"narrative":{"mechanistic_narrative":"P-selectin (SELP/GMP-140/CD62P/PADGEM) is a Ca2+-dependent lectin that mediates the earliest adhesive interactions between activated platelets or endothelium and circulating leukocytes, initiating inflammatory and thrombotic cell recruitment [PMID:2478294, PMID:1688717, PMID:1689464]. It is a multi-domain transmembrane glycoprotein with an N-terminal C-type lectin domain, an EGF-like domain, nine complement-binding consensus repeats, a transmembrane segment, and a short cytoplasmic tail; alternative splicing additionally yields a soluble form lacking the transmembrane domain [PMID:2466574, PMID:2463989]. In resting cells P-selectin is sequestered in platelet alpha-granules and endothelial Weibel-Palade bodies, and upon stimulation by agonists such as thrombin, histamine, or complement C5b-9 it is rapidly mobilized to the plasma membrane [PMID:2411738, PMID:2472431, PMID:2467701, PMID:2470750]; this regulated storage is governed by its cytoplasmic domain, which is both necessary and sufficient to sort the protein into secretory granules [PMID:1378326]. ADP-driven mobilization additionally requires combined P2Y1- and P2Y12-receptor signaling through PLC/IP3 and PI3K [PMID:33255391]. The lectin domain binds sialylated, fucosylated carbohydrate ligands—principally sialyl Lewis x—and sulfatides, with key contact residues Lys113, Tyr48, and Tyr94 lining a shallow binding groove [PMID:1712483, PMID:1717488, PMID:1717159, PMID:7681324, PMID:7508745]; it recognizes a sialylated glycoprotein counter-receptor on myeloid cells with nanomolar affinity, and L-selectin presents sialyl Lewis x as one such ligand [PMID:1704009, PMID:1378449, PMID:1716182]. Through these interactions P-selectin tethers neutrophils, monocytes, memory T cells, and NK cells, cooperating with PAF to license CD18 integrin-dependent firm adhesion, triggering leukocyte oxidative burst, and driving tissue factor expression during venous thrombus resolution [PMID:1717478, PMID:7690799, PMID:1378721, PMID:38385292]. P-selectin also complexes with TLR4 to bind bacterial LPS and promote platelet activation [PMID:16514062]. The soluble monomeric plasma form binds the same neutrophil receptor yet exerts anti-inflammatory effects, inhibiting CD18-dependent neutrophil adhesion and superoxide production [PMID:1696029, PMID:1706523, PMID:1372646].","teleology":[{"year":1985,"claim":"Established that P-selectin is a stored, mobilizable adhesion molecule rather than a constitutive surface protein, defining the regulated-secretion logic central to its function.","evidence":"Immunogold electron microscopy of resting and thrombin-stimulated platelets","pmids":["2411738"],"confidence":"High","gaps":["Did not define the molecular sorting signal","Did not identify ligands or adhesive function"]},{"year":1989,"claim":"Defined the multi-domain primary structure (lectin-EGF-CR-TM-cytoplasmic) and the existence of a soluble splice variant, providing the structural framework for all downstream mechanism.","evidence":"cDNA cloning and sequence analysis; amino acid composition and deglycosylation biochemistry","pmids":["2466574","2463989"],"confidence":"High","gaps":["Domain functions not assigned experimentally","No ligand identified at this stage"]},{"year":1989,"claim":"Extended P-selectin storage and inducible surface display to endothelium, establishing it as a shared platelet/endothelial adhesion receptor mobilized by distinct agonists including complement.","evidence":"Immunoperoxidase/immunogold EM with vWF co-localization, metabolic labeling, histamine and C5b-9 stimulation","pmids":["2472431","2467701","2470750"],"confidence":"High","gaps":["Signaling pathways for translocation only partially defined","Leukocyte counter-receptors unknown"]},{"year":1989,"claim":"Demonstrated that P-selectin mediates Ca2+-dependent adhesion of activated platelets to leukocytes, defining its core adhesive activity and distinguishing it from other platelet adhesion molecules.","evidence":"Cell adhesion and lipid-vesicle binding assays with antibody and EDTA blocking","pmids":["2478294","1688717"],"confidence":"High","gaps":["Molecular nature of the leukocyte ligand not yet known","No structural basis for binding"]},{"year":1990,"claim":"Showed via transfection that endothelial P-selectin alone is sufficient to mediate neutrophil adhesion, proving cell-autonomous adhesive function independent of leukocyte metabolism.","evidence":"COS cell transfection, purified-protein coating, antibody blocking","pmids":["1689464"],"confidence":"High","gaps":["Ligand identity still pending","Did not address subsequent firm adhesion"]},{"year":1990,"claim":"Identified carbohydrate (Lewis x / CD15) as part of the ligand, opening the carbohydrate-recognition mechanism of P-selectin.","evidence":"Antibody and free-carbohydrate inhibition of adhesion, transfectant assays","pmids":["1699666"],"confidence":"High","gaps":["Did not define the full glycan determinant","Protein scaffold of the ligand unidentified"]},{"year":1991,"claim":"Resolved the glycan determinant as sialyl Lewis x with required sialic acid and quantified high-affinity, Ca2+-dependent binding to a sialylated neutrophil glycoprotein, defining the biochemical ligand requirements.","evidence":"Purified-protein and radioligand binding, neuraminidase treatment, glycosyltransferase transfectants","pmids":["1712483","1717488","1704009"],"confidence":"High","gaps":["Protein backbone of the neutrophil receptor not yet isolated"]},{"year":1991,"claim":"Biochemically identified the myeloid counter-receptor as a distinct ~250 kDa sialylated glycoprotein (not L-selectin or lamps), and separately showed L-selectin can present sialyl Lewis x to P-selectin.","evidence":"Radioligand blotting, affinity chromatography, immunodepletion; anti-LECAM-1 blocking and removal","pmids":["1378449","1716182"],"confidence":"High","gaps":["Did not name the principal high-affinity ligand gene","Relative contribution of multiple ligands unresolved"]},{"year":1991,"claim":"Defined P-selectin's role in the leukocyte adhesion cascade: tethering leukocytes integrin-independently while cooperating with PAF to enable CD18-dependent firm adhesion.","evidence":"Adhesion assays with anti-P-selectin and anti-CD11/CD18 antibodies on stimulated endothelium","pmids":["1717478"],"confidence":"High","gaps":["Precise signaling link between tethering and PAF response unresolved"]},{"year":1991,"claim":"Revealed an additional, non-sialyl-Lewis-x ligand class (sulfatides) and that oxidant stress and sulfated glycans modulate P-selectin engagement, broadening its ligand and regulatory repertoire.","evidence":"Chimera/soluble-protein binding to sulfatides, sulfated-glycan competition, oxidant-induced surface expression assays","pmids":["1717159","1706335","1704376"],"confidence":"High","gaps":["Physiological relevance of sulfatide and sulfated-glycan binding in vivo not established","Site-proximity claim is pharmacological inference"]},{"year":1991,"claim":"Distinguished functional roles of membrane vs. soluble P-selectin: immobilized protein supports CD18-independent adhesion whereas soluble protein is anti-inflammatory, inhibiting CD18 adhesion and superoxide production.","evidence":"Adhesion and superoxide assays with immobilized vs. soluble protein, Fab blockade","pmids":["1696029","1706523"],"confidence":"High","gaps":["Mechanism of soluble-form inhibition not defined","In vivo significance of soluble pool unaddressed here"]},{"year":1992,"claim":"Mapped the granule-sorting determinant to the cytoplasmic tail, showing it is necessary and sufficient to route cargo into the regulated secretory pathway.","evidence":"Transfection, tail-deletion mutants, and tissue-factor chimeras with immunogold EM in AtT20/COS/CHO cells","pmids":["1378326"],"confidence":"High","gaps":["Cytosolic machinery recognizing the tail not identified"]},{"year":1992,"claim":"Identified the lectin-domain residues (Lys113, Tyr48, Tyr94) forming the carbohydrate-binding groove and showed their exact stereochemistry is essential, providing the structural basis of ligand recognition.","evidence":"Homology modeling and site-directed mutagenesis with cell-binding readout; conservative substitutions","pmids":["7681324","7508745"],"confidence":"High","gaps":["No experimental crystal structure of P-selectin in this corpus","Overlap of myeloid and sulfatide sites inferred from mutants"]},{"year":1992,"claim":"Established P-selectin's effector and broader cellular reach: it triggers monocyte/neutrophil superoxide release on contact, binds memory T-cell and NK subsets, modulates T-cell cytokines, recognizes a distinct carcinoma-cell ligand, and circulates as a functional plasma monomer.","evidence":"Superoxide assays, flow cytometry with purified/fusion protein, neuraminidase and sulfated-glycan dependence, plasma purification and gel filtration","pmids":["7690799","1378721","1378017","1372439","1372646"],"confidence":"Medium","gaps":["Tumor-cell ligand identity unresolved","Lymphocyte counter-receptors not biochemically defined"]},{"year":2006,"claim":"Linked P-selectin to innate immune sensing by showing it complexes with TLR4 to bind bacterial LPS and promote platelet activation.","evidence":"Co-localization, TLR4-knockout mice, LPS binding and platelet activation readouts","pmids":["16514062"],"confidence":"Medium","gaps":["Stoichiometry and structural basis of the P-selectin–TLR4 complex unknown","Single lab"]},{"year":2020,"claim":"Dissected the platelet signaling required for surface P-selectin display, showing dual P2Y1/P2Y12 input converging on PLC/IP3-driven Ca2+ and PI3K activation.","evidence":"Selective receptor antagonists and pathway inhibitors with flow cytometry and Akt phosphorylation in platelets","pmids":["33255391"],"confidence":"Medium","gaps":["Pharmacological inference; downstream granule-fusion machinery not defined","Single lab"]},{"year":2024,"claim":"Defined an in vivo role for platelet P-selectin in venous thrombus resolution, where it activates infiltrating neutrophils and monocytes, drives oxidative burst and tissue factor, and restrains fibrinolysis.","evidence":"Mouse IVC stenosis model with P-selectin blocking antibody, intravital imaging, leukocyte-aggregate and uPA/tissue-factor analyses","pmids":["38385292"],"confidence":"Medium","gaps":["Counter-receptor on infiltrating leukocytes not specified","Single lab; antibody-based loss-of-function"]},{"year":null,"claim":"The identity of the principal high-affinity physiological glycoprotein counter-receptor(s) and the cytosolic sorting machinery recognizing the P-selectin cytoplasmic tail remain unresolved in this corpus.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Named myeloid counter-receptor gene not identified in the timeline","Tail-binding adaptors unknown","No experimental high-resolution structure of P-selectin captured here"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[3,5,7]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,2,14]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,5,29]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[19]}],"pathway":[{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[3,28]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,20,29]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[5,8]}],"complexes":[],"partners":["TLR4","SELL","P2Y1","P2Y12"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P16109","full_name":"P-selectin","aliases":["CD62 antigen-like family member P","Granule membrane protein 140","GMP-140","Leukocyte-endothelial cell adhesion molecule 3","LECAM3","Platelet activation dependent granule-external membrane protein","PADGEM"],"length_aa":830,"mass_kda":90.8,"function":"Ca(2+)-dependent receptor for myeloid cells that binds to carbohydrates on neutrophils and monocytes. 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Expression of CD62P on Human Platelets Is Critically Dependent on Co-Activation of P2Y1 and P2Y12 Receptors.","date":"2020","source":"Pharmaceuticals (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/33255391","citation_count":19,"is_preprint":false},{"pmid":"11077115","id":"PMC_11077115","title":"Selectins (CD62L, CD62P) and megakaryocytic glycoproteins (CD41a, CD42b) mediate megakaryocyte-fibroblast interactions in human bone marrow.","date":"2000","source":"Leukemia research","url":"https://pubmed.ncbi.nlm.nih.gov/11077115","citation_count":19,"is_preprint":false},{"pmid":"12543548","id":"PMC_12543548","title":"Equine platelet CD62P (P-selectin) expression: a phenotypic and morphologic study.","date":"2003","source":"Veterinary immunology and immunopathology","url":"https://pubmed.ncbi.nlm.nih.gov/12543548","citation_count":18,"is_preprint":false},{"pmid":"8603015","id":"PMC_8603015","title":"A monoclonal antibody directed against a granule membrane glycoprotein (GMP-140/PADGEM, P-selectin, CD62P) inhibits ristocetin-induced platelet aggregation.","date":"1996","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/8603015","citation_count":18,"is_preprint":false},{"pmid":"19395438","id":"PMC_19395438","title":"SELP and SELPLG genetic variation is associated with cell surface measures of SELP and SELPLG: the Atherosclerosis Risk in Communities Carotid MRI Study.","date":"2009","source":"Clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19395438","citation_count":17,"is_preprint":false},{"pmid":"26279254","id":"PMC_26279254","title":"Changes of soluble CD40 ligand in the progression of acute myocardial infarction associate to endothelial nitric oxide synthase polymorphisms and vascular endothelial growth factor but not to platelet CD62P expression.","date":"2015","source":"Translational research : the journal of laboratory and clinical medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26279254","citation_count":17,"is_preprint":false},{"pmid":"12554603","id":"PMC_12554603","title":"Platelet CD62p expression and microparticle in murine acquired immune deficiency syndrome and chronic ethanol consumption.","date":"2003","source":"Alcohol and alcoholism (Oxford, Oxfordshire)","url":"https://pubmed.ncbi.nlm.nih.gov/12554603","citation_count":16,"is_preprint":false},{"pmid":"21245745","id":"PMC_21245745","title":"Platelet function alterations and their relation to P-selectin (CD62P) expression in children with iron deficiency anemia.","date":"2011","source":"Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis","url":"https://pubmed.ncbi.nlm.nih.gov/21245745","citation_count":16,"is_preprint":false},{"pmid":"19852690","id":"PMC_19852690","title":"Capture of platelets to the endothelium of the femoral vein is mediated by CD62P and CD162.","date":"2009","source":"Platelets","url":"https://pubmed.ncbi.nlm.nih.gov/19852690","citation_count":16,"is_preprint":false},{"pmid":"2465041","id":"PMC_2465041","title":"PADGEM protein in human erythroleukemia cells.","date":"1989","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/2465041","citation_count":15,"is_preprint":false},{"pmid":"14592730","id":"PMC_14592730","title":"Characterization of platelet and soluble-porcine P-selectin (CD62P).","date":"2003","source":"Veterinary immunology and immunopathology","url":"https://pubmed.ncbi.nlm.nih.gov/14592730","citation_count":15,"is_preprint":false},{"pmid":"11511037","id":"PMC_11511037","title":"Von Willebrand factor, a key protein in the exposure of CD62P on platelets.","date":"2001","source":"Biomaterials","url":"https://pubmed.ncbi.nlm.nih.gov/11511037","citation_count":15,"is_preprint":false},{"pmid":"7504345","id":"PMC_7504345","title":"T cells bind to the endothelial adhesion molecule GMP-140 (P-selectin).","date":"1993","source":"Transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/7504345","citation_count":15,"is_preprint":false},{"pmid":"16257118","id":"PMC_16257118","title":"SELPLG and SELP single-nucleotide polymorphisms in multiple sclerosis.","date":"2005","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/16257118","citation_count":14,"is_preprint":false},{"pmid":"30499177","id":"PMC_30499177","title":"Efficacy of different hemodialysis methods on dendritic cell marker CD40 and CD80 and platelet activation marker CD62P and P10 in patients with chronic renal failure.","date":"2018","source":"Journal of clinical laboratory analysis","url":"https://pubmed.ncbi.nlm.nih.gov/30499177","citation_count":14,"is_preprint":false},{"pmid":"30038572","id":"PMC_30038572","title":"The Effects of Curcumae Longae Radix, Curcuma phaeocaulis Radix and Their Processed Products on Epo/EpoR Pathway and CD62p.","date":"2018","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/30038572","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52015,"output_tokens":7624,"usd":0.135203,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16986,"output_tokens":5078,"usd":0.10594,"stage2_stop_reason":"end_turn"},"total_usd":0.241143,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1985,\n      \"finding\": \"GMP-140 (SELP) is stored in alpha-granule membranes of resting platelets and is rapidly redistributed to the plasma membrane upon thrombin stimulation, as shown by immunocytochemical localization with immunogold probes on frozen thin sections and permeabilized platelets.\",\n      \"method\": \"Immunocytochemistry (immunogold electron microscopy, saponin permeabilization, polyclonal antibody labeling)\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct subcellular localization by immunogold EM, replicated across multiple labs in subsequent years\",\n      \"pmids\": [\"2411738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) cDNA-derived primary structure predicts a multi-domain protein with an N-terminal lectin domain, an EGF-like domain, nine tandem complement-binding consensus repeats, a transmembrane domain, and a short cytoplasmic tail; some cDNAs also predict a soluble alternatively spliced form lacking the transmembrane domain.\",\n      \"method\": \"cDNA cloning and sequence analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — primary sequence determination from cDNA, foundational structural finding replicated by multiple labs\",\n      \"pmids\": [\"2466574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) is synthesized by vascular endothelial cells and localizes to Weibel-Palade bodies (co-localizing with von Willebrand factor), from which it redistributes to the plasma membrane upon histamine stimulation.\",\n      \"method\": \"Immunoperoxidase tissue staining, [35S]cysteine metabolic labeling, double-label immunogold electron microscopy on frozen thin sections, cell stimulation assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (metabolic labeling, immunogold EM, co-localization with vWf), replicated by independent labs\",\n      \"pmids\": [\"2472431\", \"2467701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"PADGEM/GMP-140 (SELP) on activated platelets mediates Ca2+-dependent adhesion to neutrophils, monocytes, HL60 cells, and U937 cells; this interaction is blocked by anti-PADGEM antibodies and EDTA but not by antibodies to GPIIb-IIIa, thrombospondin, or GPIV.\",\n      \"method\": \"Cell adhesion assay, antibody blocking, lipid vesicle binding assay, EDTA inhibition\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional adhesion assay with specific blocking antibodies, reconstitution with purified protein in vesicles, replicated across multiple labs\",\n      \"pmids\": [\"2478294\", \"1688717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) is a cysteine-rich, heavily glycosylated protein (28.8% carbohydrate by weight, predominantly N-linked); N-linked oligosaccharides account for more than 50 kDa of apparent molecular weight, and the bulk of the protein mass is extracytoplasmic.\",\n      \"method\": \"Amino acid composition analysis, enzymatic deglycosylation (PNGase/Endo H), pulse-chase biosynthetic labeling in HEL cells, protease surface accessibility assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical characterization with enzymatic digestion and pulse-chase in megakaryocytic cells, multiple orthogonal methods in one study\",\n      \"pmids\": [\"2463989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"GMP-140 (SELP) expressed on the surface of activated endothelial cells mediates rapid adhesion of neutrophils; this adhesion requires extracellular Ca2+ but not active neutrophil metabolism, and is inhibited by anti-GMP-140 antibodies.\",\n      \"method\": \"COS cell transfection with GMP-140 cDNA, cell adhesion assay, antibody blocking, purified protein coating on microtiter plates\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function transfection, purified protein reconstitution, and antibody inhibition, highly cited and replicated\",\n      \"pmids\": [\"1689464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"PADGEM/GMP-140 (SELP) recognizes the carbohydrate antigen CD15 (lacto-N-fucopentaose III, Lewis x) on neutrophils and monocytes as part of its ligand; anti-CD15 antibodies and the free carbohydrate inhibit PADGEM-mediated cell adhesion.\",\n      \"method\": \"Antibody blocking assay, carbohydrate inhibition of cell adhesion, COS cell transfection adhesion assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal blocking approaches (antibody, free carbohydrate, transfectant assay), replicated by other labs\",\n      \"pmids\": [\"1699666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) co-expressed with platelet-activating factor (PAF) on histamine- or thrombin-stimulated endothelial cells acts cooperatively: GMP-140 tethers PMNs to the endothelium without requiring CD11/CD18 integrin activation, while PAF activates CD11/CD18-dependent firm adhesion. GMP-140 tethering potentiates PMN response to PAF by a mechanism distal to the PAF receptor.\",\n      \"method\": \"Cell adhesion assay, antibody blocking (anti-GMP-140, anti-CD11/CD18), soluble GMP-140 competition, histamine/thrombin EC stimulation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple blocking reagents, pathway dissection with integrin antibodies, single lab but several orthogonal perturbations\",\n      \"pmids\": [\"1717478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Neutrophil L-selectin (LECAM-1) is modified with sialyl Lewis x and presents this oligosaccharide ligand to GMP-140 (SELP) on activated endothelium; LECAM-1 is concentrated on PMN microvilli. Anti-LECAM-1 antibodies or removal of LECAM-1 inhibits PMN binding to GMP-140 transfectants by up to 70%.\",\n      \"method\": \"Flow cytometry, anti-LECAM-1 antibody blocking, selective cell-surface removal of LECAM-1, adhesion assay on GMP-140-transfected cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — antibody blocking plus selective molecule removal, functional adhesion assay with transfectants\",\n      \"pmids\": [\"1716182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP; CD62) and ELAM-1 both recognize sialyl Lewis x (Neu5Ac-α2-3-Gal-β1-4-(Fuc-α1-3)-GlcNAc) as a carbohydrate ligand on myeloid and non-myeloid cells; sialic acid is required for recognition.\",\n      \"method\": \"Binding assay with purified GMP-140, cells expressing cloned glycosyltransferases, neuraminidase treatment, sialyl Lewis x-expressing cell lines\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — purified protein binding, enzymatic sialic acid removal, glycosyltransferase transfectants, confirmed by multiple labs\",\n      \"pmids\": [\"1712483\", \"1717488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) binds to a protease-sensitive, sialic acid-containing glycoprotein receptor on neutrophils in a Ca2+-dependent, reversible, and saturable manner (Kd ~1.5 nM, ~3–6 nM for saturation). Treatment with neuraminidase (cleaving α2-3 and α2-8 sialic acids) diminishes binding, implicating sialylated glycoprotein as receptor.\",\n      \"method\": \"Radioligand binding assay ([125I]-GMP-140), protease treatment, neuraminidase treatment, Ca2+ chelation, PMA stimulation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative in vitro binding assay with pharmacological and enzymatic dissection, single lab but multiple orthogonal perturbations\",\n      \"pmids\": [\"1704009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Oxygen radicals (H2O2, t-butylhydroperoxide, menadione) induce prolonged surface expression of GMP-140 (SELP) on endothelial cells, which mediates PMN adhesion; this occurs without new protein synthesis and requires intracellular iron (inhibited by iron chelators). Anti-GMP-140 antibody or soluble GMP-140 completely blocks PMN adhesion to oxidant-treated endothelium.\",\n      \"method\": \"PMN adhesion assay, antibody blocking, protein synthesis inhibition, antioxidant and iron chelator treatment, flow cytometry for GMP-140 surface expression\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanism dissected with multiple inhibitors and antibody blocking, specific to GMP-140 pathway\",\n      \"pmids\": [\"1704376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"CD62/GMP-140 (SELP) binds sulfatides (3-sulfated galactosyl ceramides) on granulocytes and tumor cell plasma membranes; this represents a distinct ligand from sialyl Lewis x. Granulocytes excrete sulfatides, potentially facilitating disengagement from CD62 upon exiting the bloodstream.\",\n      \"method\": \"Binding assay with soluble CD62-IgG fusion protein, sulfatide-coated plastic, tumor cell and granulocyte adhesion assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding assay with purified ligand and chimeric protein, multiple cell types tested\",\n      \"pmids\": [\"1717159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) binding to neutrophils is inhibited by sulfated glycans (heparin, fucoidan, dextran sulfate-500,000) but not by chondroitin sulfates. Fluid-phase GMP-140 exists predominantly as a tetramer. This suggests that the sulfated glycan binding site and the neutrophil receptor binding site on GMP-140 are identical or proximal.\",\n      \"method\": \"Radioligand binding assay ([125I]-GMP-140), rosetting assay, sulfated glycan competition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — competitive inhibition binding assay, single lab, pharmacological inference about site proximity\",\n      \"pmids\": [\"1706335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) is also present on platelet dense granule membranes (in addition to alpha-granules), as shown by immunoelectron microscopy double-labeling with granulophysin; after thrombin stimulation, GMP-140 redistributes from dense granule membranes to the plasma membrane.\",\n      \"method\": \"Immunoelectron microscopy (immunogold), double-labeling with anti-GMP-140 and anti-granulophysin antibodies, serotonin release assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — immunogold EM double-labeling, single lab\",\n      \"pmids\": [\"1377048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Soluble (fluid-phase) GMP-140 (SELP) inhibits CD18-dependent adhesion of TNF-α-activated neutrophils to resting endothelium, while immobilized GMP-140 supports neutrophil adhesion independently of CD18; soluble GMP-140 also inhibits superoxide anion production by neutrophils stimulated with TNF-α or fMLP.\",\n      \"method\": \"Neutrophil adhesion assay on coated plastic or endothelium, superoxide anion measurement, soluble protein competition, anti-GMP-140 Fab blockade\",\n      \"journal\": \"Science; Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional assays with purified protein (immobilized vs. soluble), antibody Fab blockade, replicated across two labs\",\n      \"pmids\": [\"1696029\", \"1706523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) binds to a glycoprotein ligand on myeloid cells (apparent Mr ~250,000 non-reduced, ~120,000 reduced) identified by [125I]-P-selectin blotting and affinity chromatography; binding is Ca2+-dependent, blocked by anti-P-selectin mAbs, sialidase-sensitive (prolonged digestion abolishes binding), and the ligand is not L-selectin, lamp-1, lamp-2, or leukosialin.\",\n      \"method\": \"Radioligand blotting ([125I]-P-selectin), affinity chromatography, neuraminidase treatment, immunodepletion, Western blot\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct biochemical identification of ligand by affinity chromatography and radioligand blotting, multiple exclusion experiments\",\n      \"pmids\": [\"1378449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The cytoplasmic domain of P-selectin (SELP) is both necessary and sufficient for sorting into the regulated secretory pathway. The last 23 amino acids of the 35-residue cytoplasmic tail are required; deletion of this region re-routes P-selectin to the plasma membrane in AtT20 cells. Replacement of the cytoplasmic tail of tissue factor with the P-selectin cytoplasmic domain redirects tissue factor to secretory granules.\",\n      \"method\": \"cDNA transfection into AtT20, COS-7, and CHO cells; immunogold electron microscopy; cytoplasmic tail deletion mutants; chimeric protein construction; agonist (8-Br-cAMP) stimulation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — domain deletion mutagenesis and chimeric protein approach with direct subcellular localization by immunogold EM, gain- and loss-of-function in multiple cell lines\",\n      \"pmids\": [\"1378326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Key residues in the lectin domain of P-selectin (SELP) required for myeloid cell binding are Lys113, Tyr48, and Tyr94, located in a shallow groove formed by the β2, β3, and β5 strands. Single alanine or phenylalanine substitutions at these positions abolish binding to myeloid cells.\",\n      \"method\": \"3D homology modeling based on rat mannose-binding protein crystal structure, site-directed mutagenesis, cell binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with functional cell-binding readout, supported by structural model\",\n      \"pmids\": [\"7681324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Soluble GMP-140 (SELP) circulates as a monomer in plasma (not tetramer as in platelet membrane form), is detectable at ~0.2–0.25 µg/mL in normal plasma, and binds the same neutrophil receptor as membrane-bound GMP-140 with equivalent functional activity. Its plasma origin is consistent with alternative mRNA splicing to produce a form lacking the transmembrane domain.\",\n      \"method\": \"Ultracentrifugation (100,000g), ELISA, protein purification from plasma, analytical gel filtration, neutrophil binding assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical purification and characterization, functional neutrophil binding confirmation, multiple orthogonal methods\",\n      \"pmids\": [\"1372646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin (SELP) on activated platelets induces superoxide anion release by monocytes and neutrophils; this effect is inhibited by anti-P-selectin antibody, anti-sialyl-Lewis X antibody, or soluble recombinant P-selectin, and requires membrane contact (not soluble platelet secretion products).\",\n      \"method\": \"Superoxide anion measurement, thrombin-activated platelet membranes, antibody blocking, soluble recombinant P-selectin competition\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional assay with antibody and recombinant protein blocking, single lab\",\n      \"pmids\": [\"7690799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin (SELP) binds to a glycoprotein ligand on carcinoma cells (colon, lung, breast) that is distinct from the myeloid cell ligand: neuraminidase treatment of a breast carcinoma cell line does not abolish GMP-140 binding (unlike HL-60 cells where sialic acid is essential), indicating tumor cells present a different P-selectin ligand.\",\n      \"method\": \"Immunohistology with GMP-140-IgG chimera on tissue sections, neuraminidase treatment, cell-line binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — chimeric protein binding assay on tissue sections and cell lines with enzymatic perturbation, single lab\",\n      \"pmids\": [\"1372439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin (SELP; CD62) binds to subpopulations of memory T lymphocytes (CD45RO+ CD4+ and CD8+) and NK cells (CD16+) in a Ca2+-dependent, sialidase-sensitive manner, and can mediate adhesion of activated platelets to these lymphocyte subsets.\",\n      \"method\": \"Multi-color flow cytometry with purified P-selectin, Ca2+ dependence, neuraminidase treatment, platelet-lymphocyte rosetting assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding assay with purified protein on cell subsets, Ca2+ and enzyme dependence shown, single lab\",\n      \"pmids\": [\"1378721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin (SELP) binds to chronically antigen-stimulated CD4+ T cells (but not freshly isolated CD4+ T cells); binding requires sialic acid (abolished by neuraminidase) and is Ca2+-dependent, and is blocked by dextran sulfate, fucoidan, and heparin. P-selectin modulates cytokine production (augments GM-CSF, inhibits IL-8) in primed T cells.\",\n      \"method\": \"P-selectin-IgG fusion protein binding assay by flow cytometry, neuraminidase treatment, sulfated glycan inhibition, cytokine measurement (ELISA)\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — binding and functional cytokine assay with genetically engineered fusion protein, single lab\",\n      \"pmids\": [\"1378017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The myeloid cell binding site and the sulfatide binding site of P-selectin (SELP) lectin domain are overlapping; conservative substitutions Tyr48Ser or Lys113Arg produce correctly folded P-selectin mutants that fail to bind HL-60 cells, establishing that the exact stereochemistry of these residues is critical.\",\n      \"method\": \"Site-directed mutagenesis, cell binding assay (HL-60 cells), sulfatide binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with multiple substitutions, direct functional readout, builds on prior structural model\",\n      \"pmids\": [\"7508745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Complement C5b-9 triggers translocation of GMP-140 (SELP) to the endothelial cell surface and secretion of vWF; this requires C9 deposition, causes Ca2+ influx from external medium, and is partially inhibited by the protein kinase inhibitor sphingosine.\",\n      \"method\": \"C5b-9 complement deposition assay, immunofluorescence for GMP-140 surface expression, cytosolic Ca2+ measurement, C8-deficient serum controls, protein kinase inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mechanistic dissection of signaling (Ca2+ influx, PKC) with pharmacological inhibitors, single lab\",\n      \"pmids\": [\"2470750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MicroRNAs miR-26b and miR-140 directly regulate SELP mRNA levels in megakaryocytes; experimental overexpression or inhibition of these miRNAs in MEG-01 cells correspondingly changes SELP mRNA levels. Hyperglycemia suppresses these miRNAs, leading to elevated SELP mRNA and increased platelet P-selectin surface expression.\",\n      \"method\": \"miRNA mimic/anti-miRNA transfection in MEG-01 megakaryocytic cells, RT-qPCR for SELP mRNA, flow cytometry for surface P-selectin, calpain inhibition to restore miRNA\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct miRNA gain/loss-of-function with mRNA readout in megakaryocytic cell line, single lab\",\n      \"pmids\": [\"27975100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ADP-activated expression of CD62P (P-selectin/SELP) from platelet granules requires co-activation of both P2Y1 and P2Y12 receptors. The P2Y12 receptor activates PI3K (demonstrated by Akt1 phosphorylation assay), while P2Y1 activation creates high cytosolic Ca2+ required for optimal PI3K activity. Inhibition of PLC, IP3 receptor, or PI3K (wortmannin) almost completely blocks ADP-induced CD62P surface expression.\",\n      \"method\": \"Selective P2Y1/P2Y12 receptor antagonists (MRS2500, PSB0739), pharmacological inhibitors (U73122, 2-APB, calmidazolium, wortmannin), flow cytometry for CD62P, Akt1 phosphorylation assay in platelet lysates\",\n      \"journal\": \"Pharmaceuticals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple selective pharmacological inhibitors with functional readouts, single lab\",\n      \"pmids\": [\"33255391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"P-selectin (SELP/CD62P) on platelets activates infiltrating neutrophils and Ly6Chigh monocytes during venous thrombus resolution; P-selectin blocking antibody reduces platelet-neutrophil and platelet-monocyte aggregates, decreases oxidative burst in the thrombus, lowers tissue factor expression in the vessel wall, reduces thrombus density, and increases urokinase-type plasminogen activator levels, accelerating fibrin degradation and thrombus volume reduction.\",\n      \"method\": \"Mouse inferior vena cava stenosis model, P-selectin blocking antibody, flow cytometry for platelet-leukocyte aggregates, scanning electron microscopy, ROS measurement, tissue factor expression analysis, uPA quantification, intravital imaging\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with blocking antibody plus in vitro mechanistic experiments, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"38385292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Platelet CD62P (P-selectin/SELP) forms a complex with TLR4 on the platelet membrane and cooperates with TLR4 in binding EHEC LPS to platelets, contributing to platelet activation; TLR4-deficient mice fail to bind O157LPS and show preserved platelet counts after LPS injection.\",\n      \"method\": \"Co-localization of TLR4 and CD62P by immunofluorescence, TLR4 knockout mice (C57BL/10ScN), in vitro and in vivo LPS binding, flow cytometry for CD40L and GPIIb/IIIa activation, perfusion assay on endothelial cells with TLR4/CD62 blocking antibodies\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model plus antibody blocking and co-localization, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"16514062\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"P-selectin (SELP/GMP-140/CD62P/PADGEM) is a multi-domain (lectin-EGF-complement repeat-transmembrane) Ca2+-dependent lectin stored in platelet alpha-granules and endothelial Weibel-Palade bodies; its cytoplasmic tail is necessary and sufficient for sorting to regulated secretory granules. Upon cellular activation, it is rapidly translocated to the plasma membrane where its lectin domain binds sialylated, fucosylated carbohydrate ligands (principally sialyl Lewis x) and sulfatides on myeloid leukocytes—with key binding residues Lys113, Tyr48, and Tyr94—thereby mediating tethering and rolling of neutrophils, monocytes, and subsets of lymphocytes and hematopoietic progenitors to activated platelets and endothelium, cooperating with PAF for integrin-dependent firm adhesion, activating leukocyte oxidative burst and tissue factor expression, and playing a role in thrombus resolution; a soluble, alternatively spliced monomeric form circulates in plasma and can exert anti-inflammatory effects by inhibiting CD18-dependent neutrophil adhesion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"P-selectin (SELP/GMP-140/CD62P/PADGEM) is a Ca2+-dependent lectin that mediates the earliest adhesive interactions between activated platelets or endothelium and circulating leukocytes, initiating inflammatory and thrombotic cell recruitment [#3, #5]. It is a multi-domain transmembrane glycoprotein with an N-terminal C-type lectin domain, an EGF-like domain, nine complement-binding consensus repeats, a transmembrane segment, and a short cytoplasmic tail; alternative splicing additionally yields a soluble form lacking the transmembrane domain [#1, #4]. In resting cells P-selectin is sequestered in platelet alpha-granules and endothelial Weibel-Palade bodies, and upon stimulation by agonists such as thrombin, histamine, or complement C5b-9 it is rapidly mobilized to the plasma membrane [#0, #2, #25]; this regulated storage is governed by its cytoplasmic domain, which is both necessary and sufficient to sort the protein into secretory granules [#17]. ADP-driven mobilization additionally requires combined P2Y1- and P2Y12-receptor signaling through PLC/IP3 and PI3K [#27]. The lectin domain binds sialylated, fucosylated carbohydrate ligands\\u2014principally sialyl Lewis x\\u2014and sulfatides, with key contact residues Lys113, Tyr48, and Tyr94 lining a shallow binding groove [#9, #12, #18, #24]; it recognizes a sialylated glycoprotein counter-receptor on myeloid cells with nanomolar affinity, and L-selectin presents sialyl Lewis x as one such ligand [#10, #16, #8]. Through these interactions P-selectin tethers neutrophils, monocytes, memory T cells, and NK cells, cooperating with PAF to license CD18 integrin-dependent firm adhesion, triggering leukocyte oxidative burst, and driving tissue factor expression during venous thrombus resolution [#7, #20, #22, #28]. P-selectin also complexes with TLR4 to bind bacterial LPS and promote platelet activation [#29]. The soluble monomeric plasma form binds the same neutrophil receptor yet exerts anti-inflammatory effects, inhibiting CD18-dependent neutrophil adhesion and superoxide production [#15, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 1985,\n      \"claim\": \"Established that P-selectin is a stored, mobilizable adhesion molecule rather than a constitutive surface protein, defining the regulated-secretion logic central to its function.\",\n      \"evidence\": \"Immunogold electron microscopy of resting and thrombin-stimulated platelets\",\n      \"pmids\": [\"2411738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular sorting signal\", \"Did not identify ligands or adhesive function\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Defined the multi-domain primary structure (lectin-EGF-CR-TM-cytoplasmic) and the existence of a soluble splice variant, providing the structural framework for all downstream mechanism.\",\n      \"evidence\": \"cDNA cloning and sequence analysis; amino acid composition and deglycosylation biochemistry\",\n      \"pmids\": [\"2466574\", \"2463989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain functions not assigned experimentally\", \"No ligand identified at this stage\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Extended P-selectin storage and inducible surface display to endothelium, establishing it as a shared platelet/endothelial adhesion receptor mobilized by distinct agonists including complement.\",\n      \"evidence\": \"Immunoperoxidase/immunogold EM with vWF co-localization, metabolic labeling, histamine and C5b-9 stimulation\",\n      \"pmids\": [\"2472431\", \"2467701\", \"2470750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling pathways for translocation only partially defined\", \"Leukocyte counter-receptors unknown\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Demonstrated that P-selectin mediates Ca2+-dependent adhesion of activated platelets to leukocytes, defining its core adhesive activity and distinguishing it from other platelet adhesion molecules.\",\n      \"evidence\": \"Cell adhesion and lipid-vesicle binding assays with antibody and EDTA blocking\",\n      \"pmids\": [\"2478294\", \"1688717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular nature of the leukocyte ligand not yet known\", \"No structural basis for binding\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Showed via transfection that endothelial P-selectin alone is sufficient to mediate neutrophil adhesion, proving cell-autonomous adhesive function independent of leukocyte metabolism.\",\n      \"evidence\": \"COS cell transfection, purified-protein coating, antibody blocking\",\n      \"pmids\": [\"1689464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand identity still pending\", \"Did not address subsequent firm adhesion\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Identified carbohydrate (Lewis x / CD15) as part of the ligand, opening the carbohydrate-recognition mechanism of P-selectin.\",\n      \"evidence\": \"Antibody and free-carbohydrate inhibition of adhesion, transfectant assays\",\n      \"pmids\": [\"1699666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the full glycan determinant\", \"Protein scaffold of the ligand unidentified\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Resolved the glycan determinant as sialyl Lewis x with required sialic acid and quantified high-affinity, Ca2+-dependent binding to a sialylated neutrophil glycoprotein, defining the biochemical ligand requirements.\",\n      \"evidence\": \"Purified-protein and radioligand binding, neuraminidase treatment, glycosyltransferase transfectants\",\n      \"pmids\": [\"1712483\", \"1717488\", \"1704009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protein backbone of the neutrophil receptor not yet isolated\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Biochemically identified the myeloid counter-receptor as a distinct ~250 kDa sialylated glycoprotein (not L-selectin or lamps), and separately showed L-selectin can present sialyl Lewis x to P-selectin.\",\n      \"evidence\": \"Radioligand blotting, affinity chromatography, immunodepletion; anti-LECAM-1 blocking and removal\",\n      \"pmids\": [\"1378449\", \"1716182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not name the principal high-affinity ligand gene\", \"Relative contribution of multiple ligands unresolved\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Defined P-selectin's role in the leukocyte adhesion cascade: tethering leukocytes integrin-independently while cooperating with PAF to enable CD18-dependent firm adhesion.\",\n      \"evidence\": \"Adhesion assays with anti-P-selectin and anti-CD11/CD18 antibodies on stimulated endothelium\",\n      \"pmids\": [\"1717478\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise signaling link between tethering and PAF response unresolved\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Revealed an additional, non-sialyl-Lewis-x ligand class (sulfatides) and that oxidant stress and sulfated glycans modulate P-selectin engagement, broadening its ligand and regulatory repertoire.\",\n      \"evidence\": \"Chimera/soluble-protein binding to sulfatides, sulfated-glycan competition, oxidant-induced surface expression assays\",\n      \"pmids\": [\"1717159\", \"1706335\", \"1704376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of sulfatide and sulfated-glycan binding in vivo not established\", \"Site-proximity claim is pharmacological inference\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Distinguished functional roles of membrane vs. soluble P-selectin: immobilized protein supports CD18-independent adhesion whereas soluble protein is anti-inflammatory, inhibiting CD18 adhesion and superoxide production.\",\n      \"evidence\": \"Adhesion and superoxide assays with immobilized vs. soluble protein, Fab blockade\",\n      \"pmids\": [\"1696029\", \"1706523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of soluble-form inhibition not defined\", \"In vivo significance of soluble pool unaddressed here\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapped the granule-sorting determinant to the cytoplasmic tail, showing it is necessary and sufficient to route cargo into the regulated secretory pathway.\",\n      \"evidence\": \"Transfection, tail-deletion mutants, and tissue-factor chimeras with immunogold EM in AtT20/COS/CHO cells\",\n      \"pmids\": [\"1378326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cytosolic machinery recognizing the tail not identified\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Identified the lectin-domain residues (Lys113, Tyr48, Tyr94) forming the carbohydrate-binding groove and showed their exact stereochemistry is essential, providing the structural basis of ligand recognition.\",\n      \"evidence\": \"Homology modeling and site-directed mutagenesis with cell-binding readout; conservative substitutions\",\n      \"pmids\": [\"7681324\", \"7508745\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental crystal structure of P-selectin in this corpus\", \"Overlap of myeloid and sulfatide sites inferred from mutants\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Established P-selectin's effector and broader cellular reach: it triggers monocyte/neutrophil superoxide release on contact, binds memory T-cell and NK subsets, modulates T-cell cytokines, recognizes a distinct carcinoma-cell ligand, and circulates as a functional plasma monomer.\",\n      \"evidence\": \"Superoxide assays, flow cytometry with purified/fusion protein, neuraminidase and sulfated-glycan dependence, plasma purification and gel filtration\",\n      \"pmids\": [\"7690799\", \"1378721\", \"1378017\", \"1372439\", \"1372646\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tumor-cell ligand identity unresolved\", \"Lymphocyte counter-receptors not biochemically defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked P-selectin to innate immune sensing by showing it complexes with TLR4 to bind bacterial LPS and promote platelet activation.\",\n      \"evidence\": \"Co-localization, TLR4-knockout mice, LPS binding and platelet activation readouts\",\n      \"pmids\": [\"16514062\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and structural basis of the P-selectin\\u2013TLR4 complex unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissected the platelet signaling required for surface P-selectin display, showing dual P2Y1/P2Y12 input converging on PLC/IP3-driven Ca2+ and PI3K activation.\",\n      \"evidence\": \"Selective receptor antagonists and pathway inhibitors with flow cytometry and Akt phosphorylation in platelets\",\n      \"pmids\": [\"33255391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pharmacological inference; downstream granule-fusion machinery not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined an in vivo role for platelet P-selectin in venous thrombus resolution, where it activates infiltrating neutrophils and monocytes, drives oxidative burst and tissue factor, and restrains fibrinolysis.\",\n      \"evidence\": \"Mouse IVC stenosis model with P-selectin blocking antibody, intravital imaging, leukocyte-aggregate and uPA/tissue-factor analyses\",\n      \"pmids\": [\"38385292\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Counter-receptor on infiltrating leukocytes not specified\", \"Single lab; antibody-based loss-of-function\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the principal high-affinity physiological glycoprotein counter-receptor(s) and the cytosolic sorting machinery recognizing the P-selectin cytoplasmic tail remain unresolved in this corpus.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Named myeloid counter-receptor gene not identified in the timeline\", \"Tail-binding adaptors unknown\", \"No experimental high-resolution structure of P-selectin captured here\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [3, 5, 7]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0030246\", \"supporting_discovery_ids\": [9, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 2, 14]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 29]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [3, 28]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 20, 29]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [5, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TLR4\", \"SELL\", \"P2Y1\", \"P2Y12\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}