{"gene":"SELP","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1985,"finding":"GMP-140 (SELP/P-selectin) is an alpha-granule membrane protein of platelets that is redistributed to the plasma membrane upon thrombin stimulation, as demonstrated by immunogold labeling of resting versus activated platelets.","method":"Immunocytochemistry with monoclonal antibody S12, immunogold labeling, and saponin permeabilization on resting and thrombin-stimulated platelets","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct subcellular localization by immunogold with functional context, replicated by multiple groups","pmids":["2411738"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) cDNA encodes a cysteine-rich protein with modular domains: an N-terminal lectin domain, an EGF-like domain, nine tandem complement-binding consensus repeats, a transmembrane domain, and a cytoplasmic tail. Alternative splicing predicts a soluble secreted form lacking the transmembrane segment.","method":"cDNA cloning and sequence analysis from platelet/endothelial cell libraries","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — primary sequence determination with structural domain identification, foundational molecular characterization","pmids":["2466574"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) is synthesized by vascular endothelial cells and is stored in Weibel-Palade bodies, co-localizing with von Willebrand factor, as demonstrated by immunogold double-labeling; histamine stimulation rapidly redistributes GMP-140 to the plasma membrane.","method":"Immunoperoxidase tissue distribution, [35S]cysteine biosynthetic labeling, immunogold double-label on frozen thin sections, histamine stimulation","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — direct subcellular localization by immunogold with co-localization and functional stimulus, replicated by multiple groups","pmids":["2472431"],"is_preprint":false},{"year":1989,"finding":"PADGEM/GMP-140 (SELP) on activated platelets mediates adhesion to neutrophils, monocytes, HL-60, and U937 cells; this interaction is inhibited by anti-PADGEM antibodies and EDTA (Ca2+-dependence), but not by anti-GPIIb-IIIa or anti-thrombospondin antibodies, establishing SELP as the specific adhesion receptor.","method":"Platelet-leukocyte rosetting assay, antibody blocking, phospholipid vesicle binding assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal inhibition with specific antibodies and reconstitution with vesicles, replicated across multiple cell types","pmids":["2478294"],"is_preprint":false},{"year":1989,"finding":"PADGEM/GMP-140 (SELP) is localized to Weibel-Palade bodies of endothelial cells (co-localizing with vWF by double immunofluorescence), and disappears from these structures upon secretagogue stimulation.","method":"Immunofluorescence double-labeling with anti-PADGEM and anti-vWF antibodies, secretagogue stimulation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — co-localization by double-label immunofluorescence, confirmed by secretagogue-induced disappearance","pmids":["2467701"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) stimulated secretion from endothelial Weibel-Palade bodies is accompanied by rapid redistribution of GMP-140 to the cell surface, occurring within 3 min of histamine stimulation and subsequently removed by an endocytic mechanism; surface expression is agonist-dose dependent and parallels vWF secretion.","method":"Dual-label immunofluorescence, monoclonal antibody S12 binding kinetics, paraformaldehyde fixation and 4°C arrest to trap surface expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — quantitative kinetic analysis of surface redistribution with multiple agonists and mechanistic controls","pmids":["2470733"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) contains 28.8% carbohydrate by weight (including sialic acid, neutral sugars, N-acetylglucosamine), and N-linked oligosaccharides account for >50 kDa of apparent molecular weight. Biosynthesis involves a 98–125 kDa high-mannose precursor that matures to 140 kDa within 40–60 min. The majority of the protein mass is extracytoplasmic.","method":"Amino acid composition, enzymatic removal of N-linked oligosaccharides, pulse-chase biosynthetic labeling, protease treatment of activated platelets plus Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — biochemical characterization with multiple orthogonal methods","pmids":["2463989"],"is_preprint":false},{"year":1989,"finding":"GMP-140 (SELP) binds heparin in a divalent cation-independent manner; binding is inhibited by excess heparin and other sulfated glycans (fucoidan, dextran sulfate) but not by chondroitin sulfates, establishing GMP-140 as a heparin-binding protein.","method":"Heparin-Sepharose affinity chromatography, radioiodinated GMP-140 binding to heparin-Matrex beads with competitive inhibition assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding assay with competitive inhibition, single lab","pmids":["2480118"],"is_preprint":false},{"year":1990,"finding":"GMP-140 (SELP) expressed on activated endothelial cells mediates rapid neutrophil adhesion; neutrophils and HL-60 cells bind specifically to COS cells transfected with GMP-140 cDNA and to purified GMP-140-coated surfaces; binding requires extracellular Ca2+ but not active neutrophil metabolism.","method":"COS cell transfection with GMP-140 cDNA, adhesion assays with purified protein-coated microtiter wells, antibody blocking, metabolic inhibitors, Ca2+ chelation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function transfection combined with purified protein adhesion assay and multiple controls, highly cited foundational paper","pmids":["1689464"],"is_preprint":false},{"year":1990,"finding":"GMP-140 (SELP) gene spans >50 kb and contains 17 exons, with almost all exons encoding distinct structural domains (lectin, EGF, each of the nine consensus repeats, transmembrane region). The soluble and 8-repeat variant forms arise from alternative splicing of distinct exons.","method":"Genomic library cloning, restriction mapping, exon sequencing, PCR amplification of alternative transcripts from platelet and endothelial cell RNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — complete genomic structure determination with PCR confirmation of alternative splice forms","pmids":["1701178"],"is_preprint":false},{"year":1990,"finding":"CD15 (lacto-N-fucopentaose III, Lex) on neutrophils and monocytes is a component of the PADGEM/GMP-140 (SELP) ligand; anti-CD15 antibodies inhibit leukocyte-platelet binding, and the CD15 trisaccharide directly inhibits binding of HL-60 cells to PADGEM-expressing COS cells and purified PADGEM vesicles.","method":"Antibody blocking with panel of anti-leukocyte antibodies, carbohydrate inhibition assays with synthetic oligosaccharides, COS-cell PADGEM transfection adhesion assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches (antibody blocking + carbohydrate competition + transfection system), replicated","pmids":["1699666"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) binds to a glycoprotein receptor on neutrophils via a lectin-like mechanism; binding is Ca2+-dependent, reversible, saturable (~1.5 nM half-maximal), and abolished by protease treatment or neuraminidase (alpha 2-3 and alpha 2-8 linked sialic acids). Anti-CD15 (Lex) antibody does not block binding, indicating that sialic acid-containing structures beyond simple Lex are required.","method":"Radioligand binding assay with [125I]GMP-140, enzyme treatments (protease, neuraminidase), blocking antibodies, Ca2+ chelation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — quantitative radioligand binding with enzyme dissection of ligand requirements, rigorous controls","pmids":["1704009"],"is_preprint":false},{"year":1991,"finding":"CD62/P-selectin (SELP) and ELAM-1 recognize the same carbohydrate ligand, sialyl-Lewis x (sLex), on neutrophils and monocytes; binding of CD62-expressing cells to sLex structures was demonstrated by cell adhesion assays.","method":"Cell adhesion assays using sLex-expressing cells versus control cells, antibody blocking","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct cell adhesion assay with defined carbohydrate ligand, independently confirmed by multiple groups","pmids":["1712483"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) recognizes alpha(2-3)sialylated, alpha(1-3)fucosylated lactosaminoglycans (sialyl Lewis x sequence) on both myeloid and non-myeloid cells; sialic acid is required (cells expressing Lex without sialyl-Lex do not bind), but HL-60 myeloid cells bind with higher affinity than CHO cells expressing sLex alone, indicating additional structural requirements beyond the minimal tetrasaccharide.","method":"Purified GMP-140 binding to cells naturally expressing specific oligosaccharides and cells transfected with glycosyltransferase cDNAs; neuraminidase treatment","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — systematic comparison across cell types with defined glycosyltransferase expression, multiple controls","pmids":["1717488"],"is_preprint":false},{"year":1991,"finding":"CD62/P-selectin (SELP) binds to sulfatides (3-sulfated galactosyl ceramides), which constitute the principal ligand on some tumor cell plasma membranes and are excreted by granulocytes; sulfatides adsorbed to plastic bind CD62 as avidly as myeloid or tumor cells, suggesting a role in facilitating leukocyte disengagement from CD62 at inflammatory sites.","method":"Cell adhesion assays to sulfatide-coated plastic, competition with sulfatides, granulocyte sulfatide excretion measurement","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — direct binding to purified ligand with functional competition assay","pmids":["1717159"],"is_preprint":false},{"year":1991,"finding":"LECAM-1 (L-selectin) on neutrophils presents sialyl Lewis x oligosaccharide ligands to GMP-140 (SELP) and ELAM-1 on vascular endothelium; LECAM-1 is concentrated on neutrophil microvilli and anti-LECAM-1 antibodies or removal of surface LECAM-1 inhibit neutrophil binding to GMP-140/ELAM-1 transfectants by up to 70%.","method":"Cell binding assays to selectin-transfected cells, anti-LECAM-1 antibody blocking, selective LECAM-1 removal, immunolocalization to microvilli","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple blocking approaches with transfected cell system, identifies trans-presentation mechanism","pmids":["1716182"],"is_preprint":false},{"year":1991,"finding":"GMP-140 (SELP) on activated endothelium tethers neutrophils without requiring CD11/CD18 integrin activation, but potentiates subsequent PAF-induced CD11/CD18-dependent firm adhesion. Coexpression of GMP-140 and PAF by histamine- or thrombin-stimulated endothelium is required for maximal PMN adhesion through a juxtacrine mechanism.","method":"Antibody blocking of GMP-140 and CD11/CD18, fluid-phase GMP-140 competition, purified GMP-140 functional assays, histamine/thrombin stimulation of endothelial cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — mechanistic dissection of two-step adhesion cascade with multiple antibody blockers and purified protein, defines pathway position","pmids":["1717478"],"is_preprint":false},{"year":1991,"finding":"Oxygen radicals (H2O2, t-butylhydroperoxide, menadione) induce prolonged surface expression of GMP-140 (SELP) on endothelial cells, promoting neutrophil adhesion; this process does not require de novo protein synthesis and is completely blocked by anti-GMP-140 antibody or soluble GMP-140.","method":"Oxidant treatment of endothelial cells, neutrophil adhesion assay, antibody blocking, protein synthesis inhibition, antioxidant treatment","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — specific mechanistic dissection with inhibitors and antibody blocking, defines oxidant-triggered GMP-140 mobilization","pmids":["1704376"],"is_preprint":false},{"year":1991,"finding":"Complement C5b-9 induces surface expression of GMP-140 (SELP) on endothelial cells via Ca2+ influx across the plasma membrane; the response is blocked by removal of external calcium and partially inhibited by sphingosine (protein kinase C inhibitor); C5b-8 without C9 is insufficient.","method":"Complement activation on antibody-sensitized endothelial cells, C8-deficient serum controls, intracellular Ca2+ measurement, external Ca2+ removal, sphingosine inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — mechanistic pathway dissection with complement-deficient sera and Ca2+/kinase inhibitors","pmids":["2470750"],"is_preprint":false},{"year":1991,"finding":"Immobilized GMP-140 (SELP) supports neutrophil adhesion without CD18 integrin activation and inhibits superoxide anion generation and cell spreading; fluid-phase GMP-140 also inhibits TNF-alpha-induced superoxide generation in neutrophils, establishing an anti-inflammatory signaling role.","method":"Neutrophil adhesion to GMP-140-coated plastic, superoxide assay, anti-GMP-140 Fab reversal, TNF-alpha activation with fluid-phase GMP-140","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — functional assay with specific Fab reversal, defines inhibitory signaling outcome of SELP engagement","pmids":["1706523"],"is_preprint":false},{"year":1991,"finding":"Soluble (fluid-phase) GMP-140 (SELP) specifically inhibits CD18-dependent adhesion of TNF-alpha-activated neutrophils to resting endothelium, but does not inhibit resting neutrophil adhesion to TNF-activated endothelium, demonstrating a selective anti-inflammatory function.","method":"Soluble GMP-140 competition assays with TNF-alpha-activated neutrophils or endothelium, CD18-blocking antibodies","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 — specific functional dissection showing selectivity of soluble SELP inhibition","pmids":["1696029"],"is_preprint":false},{"year":1992,"finding":"A major glycoprotein ligand for P-selectin (SELP) on myeloid cells was identified at ~120 kDa (reducing conditions) or ~250 kDa (non-reducing); binding is Ca2+-dependent, protease-sensitive, requires sialic acid (neuraminidase abolishes binding), and is not L-selectin, LAMP-1, LAMP-2, or leukosialin.","method":"Blotting of neutrophil/HL-60 extracts with [125I]P-selectin, affinity chromatography with [3H]glucosamine-labeled extracts, enzyme treatments (sialidase, PNGase F), immunodepletion with antibodies to candidate proteins","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — affinity chromatography identification with systematic exclusion of candidates and enzyme dissection","pmids":["1378449"],"is_preprint":false},{"year":1992,"finding":"The cytoplasmic domain (last 23 amino acids of the 35-residue tail) of P-selectin (SELP) is both necessary and sufficient for sorting of the protein into regulated secretory granules; deletion of this region redirects P-selectin to the plasma membrane in AtT20 cells, and replacement of tissue factor's cytoplasmic tail with the P-selectin tail redirects tissue factor to granules.","method":"Transfection of P-selectin cDNA and deletion/chimeric constructs into COS-7, CHO-K1, and AtT20 cells; immunogold electron microscopy; cAMP stimulation; Western blot","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 — gain- and loss-of-function domain swapping with reconstitution of granule targeting in AtT20 cells","pmids":["1378326"],"is_preprint":false},{"year":1992,"finding":"Plasma contains a soluble form of GMP-140 (SELP) at ~0.25 µg/mL in men, which lacks the transmembrane domain (consistent with alternative splicing), elutes as a monomer by gel filtration, and binds the same neutrophil receptor as membrane-bound GMP-140.","method":"ELISA detection, 100,000g ultracentrifugation, plasma protein purification, analytical gel filtration, neutrophil binding assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — protein purification from plasma with biochemical characterization and functional neutrophil binding assay","pmids":["1372646"],"is_preprint":false},{"year":1992,"finding":"P-selectin (SELP) binds to a subset of peripheral blood lymphocytes (CD4+, CD8+, CD16+, preferentially CD45RO+ memory cells) and can mediate adhesion of activated platelets to lymphocytes; binding is Ca2+-dependent and blocked by sialidase pretreatment.","method":"Multi-color immunofluorescence with purified P-selectin, platelet-lymphocyte adhesion assay, Ca2+ chelation, sialidase treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding assay with enzyme and Ca2+ controls, single lab","pmids":["1378721"],"is_preprint":false},{"year":1992,"finding":"GMP-140 (SELP) binds to chronically antigen-stimulated CD4+ T cells (but not freshly isolated T cells) via sialic acid-dependent, EDTA-sensitive (Ca2+-dependent) structures, and augments GM-CSF production while inhibiting IL-8 production upon co-stimulation with anti-TCR antibody.","method":"GMP-140-IgG Fc chimera binding assay, neuraminidase/trypsin treatment, EDTA inhibition, cytokine measurement by ELISA","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding with enzymatic dissection and cytokine functional readout, single lab","pmids":["1378017"],"is_preprint":false},{"year":1992,"finding":"GMP-140 (SELP) binds to carcinoma cells (colon, lung, breast) via a ligand distinct from that on myeloid HL-60 cells; neuraminidase treatment of breast carcinoma cells does not abolish (and sometimes increases) GMP-140 binding, whereas it abolishes binding to HL-60 cells, indicating tumor cells present a different (sialic acid-independent) P-selectin ligand.","method":"Soluble GMP-140-IgG chimera immunohistology on tumor tissue sections, binding assays to carcinoma cell lines, neuraminidase treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — systematic comparison of ligand requirements across cell types with enzyme dissection, single lab","pmids":["1372439"],"is_preprint":false},{"year":1993,"finding":"Critical residues in the lectin domain of P-selectin (SELP) required for myeloid cell binding were identified: Lys113, Tyr48, and Tyr94. Single substitutions (Lys113Ala, Tyr48Ala, Tyr48Phe, Tyr94Ala, Tyr94Phe) abolish binding. These residues form a shallow groove on the molecule modeled on the rat mannose-binding protein crystal structure.","method":"Homology modeling of lectin domain on mannose-binding protein crystal structure; site-directed mutagenesis; myeloid cell binding assays with mutant P-selectin constructs","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — active-site mutagenesis with functional validation in cell binding assay, supported by structural model","pmids":["7681324"],"is_preprint":false},{"year":1993,"finding":"P-selectin activation of monocytes and neutrophils through contact with activated platelets induces superoxide anion release; this is inhibited by anti-P-selectin antibody, anti-sialyl-Lewis X antibody, or soluble recombinant P-selectin fusion protein, establishing P-selectin-mediated outside-in signaling.","method":"Superoxide anion measurement in platelet-leukocyte co-cultures, platelet membrane fraction assays, antibody and soluble receptor blocking","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — specific inhibition by multiple independent reagents (antibody, sLex antibody, soluble receptor) with functional readout","pmids":["7690799"],"is_preprint":false},{"year":1994,"finding":"The P-selectin (SELP) binding sites for myeloid cells and sulfatides are overlapping; Tyr48Ser or Lys113Arg substitutions create correctly folded but non-binding P-selectin mutants for both HL-60 cells and sulfatides, indicating these residues define the shared binding pocket.","method":"Extended mutagenesis panel with myeloid cell binding assays and sulfatide competition","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis defining shared binding site for two different ligand classes","pmids":["7508745"],"is_preprint":false},{"year":1993,"finding":"Expression cloning from HL-60 cells identified PSGL-1 (P-selectin glycoprotein ligand-1) as a functional glycoprotein ligand for P-selectin (SELP); coexpression of the protein and a fucosyltransferase in COS cells is required for P-selectin binding; the ligand is expressed as a 220 kDa homodimer.","method":"Expression cloning from HL-60 cDNA library, COS-cell transfection with PSGL-1 and fucosyltransferase cDNAs, P-selectin binding assay, anti-P-selectin antibody blocking","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — expression cloning with reconstitution in COS cells, defines obligate role of fucosylation for ligand function","pmids":["7505206"],"is_preprint":false},{"year":1995,"finding":"P-selectin (SELP) binds primitive hematopoietic progenitors (CD34+ cells including CFU-GM and pre-CFU); binding requires divalent cations, is protease-sensitive, and is abolished by neuraminidase. PSGL-1 mRNA is expressed by CD34+ cells, suggesting PSGL-1 as a major P-selectin ligand on hematopoietic progenitors.","method":"P-selectin binding assays on CD34+ cells, clonogenic assays, temperature independence testing, enzyme treatments, RT-PCR for PSGL-1, anti-P-selectin antibody blocking","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding characterization with enzyme dissection, single lab","pmids":["7540063"],"is_preprint":false},{"year":1999,"finding":"Platelet glycoprotein Ibalpha (part of the GP Ib-IX-V complex) is identified as a counter-receptor for P-selectin (SELP); this interaction does not require Ca2+, core-2 carbohydrate branching, or alpha(1,3)-fucosylation (unlike PSGL-1 binding) but is inhibited by sulfated proteoglycans and by antibodies to a tyrosine-sulfated region of GP Ibalpha.","method":"P-selectin-transfected cell adhesion to immobilized GP Ibalpha, GP Ibalpha-transfected cell rolling on P-selectin and histamine-stimulated endothelium, anti-P-selectin and anti-GP Ibalpha antibody blocking, Ca2+ chelation","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function transfection, rolling assay, specific antibody inhibition defining mechanistic requirements","pmids":["10499919"],"is_preprint":false},{"year":2000,"finding":"Crystal structures of P-selectin lectin-EGF domain bound to sLex and to the N-terminal domain of PSGL-1 (modified by tyrosine sulfation and sLex) reveal the molecular basis of high-affinity PSGL-1 recognition: PSGL-1 sulfated tyrosine contacts the P-selectin lectin domain at a site distinct from but adjacent to the sLex binding groove.","method":"X-ray crystallography of P-selectin LE domain co-complexed with sLex and with PSGL-1 N-terminal peptide","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with bound ligands, foundational structural biology paper","pmids":["11081633"],"is_preprint":false},{"year":2000,"finding":"Versican, a large chondroitin sulfate/dermatan sulfate proteoglycan, binds P-selectin (SELP) via its chondroitin sulfate (CS) chains; binding is inhibited by CS B, CS E, and heparan sulfate but not other glycosaminoglycans, and soluble P-selectin directly binds immobilized CS B and CS E.","method":"Solid-phase binding assay of P-selectin to versican, glycosaminoglycan competition, direct binding of soluble P-selectin to immobilized CS chains, cross-blocking with L-selectin","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct binding with systematic GAG competition, defines CS-chain specificity","pmids":["10950950"],"is_preprint":false},{"year":2003,"finding":"P-selectin (SELP) anchors newly released ultralarge von Willebrand factor (ULVWF) strings to the endothelial cell surface; CHO cells expressing P-selectin adhere to immobilized ULVWF; anti-VWF antibody co-immunoprecipitates P-selectin from histamine-activated endothelial cells; anti-P-selectin antibody blocks ULVWF string formation; the minimal ULVWF-P-selectin bond strength is ~7.2 pN.","method":"CHO-P-selectin adhesion to immobilized ULVWF, co-immunoprecipitation from histamine-activated endothelium, antibody blocking of string formation, atomic force microscopy bond strength measurement","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (cell adhesion, co-IP, functional blocking, force measurement), single lab","pmids":["14630802"],"is_preprint":false},{"year":2003,"finding":"P-selectin (SELP) interaction with PSGL-1 generates procoagulant microparticles; P-sel-Ig chimeras induce microparticle formation in human blood via PSGL-1; Psgl1-/- mice produce fewer microparticles after P-sel-Ig infusion; infused microparticles bearing tissue factor bind to thrombi and enhance fibrin formation in hemophilia A mice, normalizing tail-bleeding time.","method":"P-selectin-Ig chimera treatment of human blood, Psgl1-/- mouse experiments, flow cytometry for microparticles, infusion of procoagulant microparticles into hemophilia A mice, fibrin kinetics and tail-bleeding assay","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic (Psgl1-/-) and pharmacological evidence in vivo, multiple outcome measures, defines SELP-PSGL-1 microparticle pathway","pmids":["12858167"],"is_preprint":false},{"year":1997,"finding":"CD24, a mucin-type GPI-linked glycoprotein on neutrophils and tumor cells, is a ligand for P-selectin (SELP); CD24-coated beads bind P-selectin-IgG; binding depends on divalent cations and is abolished by O-sialoglycoprotein endopeptidase but not sialidase; transfection of CD24 into adenocarcinoma cells enhances P-selectin-dependent platelet binding.","method":"CD24 purification and bead coating, P-selectin-IgG binding assay, enzyme treatments, CD24 transfection, platelet adhesion assay, phospholipase C removal","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function transfection, purified ligand binding, and enzyme dissection defining novel ligand","pmids":["9129046"],"is_preprint":false},{"year":2006,"finding":"Lipopolysaccharide (LPS) from EHEC O157 binds to platelets through a complex of TLR4 and CD62P (SELP), leading to platelet activation; TLR4 colocalizes with CD62P on the platelet membrane; Tlr4-deficient mice do not bind O157LPS; CD62P further contributes to LPS-triggered platelet activation on endothelial cells in perfusion experiments.","method":"Immunofluorescence co-localization of TLR4 and CD62P on platelets, Tlr4-/- mouse in vivo LPS injection, flow cytometry for platelet activation (GPIIb/IIIa, CD40L), perfusion experiments with TLR4/CD62P-blocking antibodies","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout combined with co-localization and functional blocking in perfusion model","pmids":["16514062"],"is_preprint":false},{"year":2010,"finding":"Rolling of human neutrophils on P-selectin (SELP) induces the extended (but not high-affinity) conformation of LFA-1 (alpha-L beta-2 integrin) through signaling dependent on PSGL-1, Src family kinase FGR, and SYK, allowing binding to immobilized extension-reporter antibodies during rolling.","method":"Human neutrophil rolling assays on P-selectin under flow, reporter antibody binding assays (KIM127, NKI-L16, mAb24), PSGL-1 blocking, kinase inhibitors, microfluidics-based reporter assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — mechanistic signaling pathway dissection with specific inhibitors and novel conformational reporter assay under physiological flow","pmids":["20445017"],"is_preprint":false},{"year":2011,"finding":"PSGL-1, CD44, and ESL-1 on mature leukocytes are physiologic glycoprotein ligands for P-selectin (SELP) on endothelial cells; PSGL-1 and CD44 induce signals that activate beta-2 integrin LFA-1 to promote slow rolling, while ESL-1 activates Mac-1 in adherent neutrophils.","method":"Review synthesizing in vivo mouse genetic data (knockout mice for each ligand), intravital microscopy rolling assays, signaling studies (integrin activation)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — synthesis of multiple in vivo genetic studies defining ligand-specific signaling functions","pmids":["22021370"],"is_preprint":false},{"year":2016,"finding":"miR-26b and miR-140 directly regulate SELP (P-selectin) mRNA levels in megakaryocytes; overexpression or inhibition of these miRNAs in MEG-01 cells modulates SELP mRNA levels; hyperglycemia in type 2 diabetes suppresses these miRNAs via calpain-mediated Dicer degradation, leading to elevated SELP mRNA and platelet P-selectin surface expression.","method":"miRNA mimic/anti-miRNA transfection in MEG-01 megakaryocytes, RT-qPCR for SELP mRNA, calpain inhibitor (calpeptin) rescue, flow cytometry for surface P-selectin","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — functional miRNA manipulation in relevant cell type with mRNA level and surface expression readouts, single lab","pmids":["27975100"],"is_preprint":false},{"year":2024,"finding":"P-selectin/CD62P blockade after venous thrombus formation reduces monocyte and neutrophil infiltration, decreases reactive oxygen species production by neutrophils and tissue factor expression by classical monocytes, reduces thrombus density, and accelerates fibrinolysis (increased urokinase-type plasminogen activator levels) and thrombus resolution in a mouse inferior vena cava stenosis model.","method":"Mouse IVC stenosis thrombosis model, P-selectin-blocking antibody administration post-thrombus formation, intravital microscopy, flow cytometry for platelet-leukocyte aggregates, scanning electron microscopy, ROS assay, tissue factor expression, uPA measurement","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic/pharmacological model with multiple mechanistic readouts defining P-selectin's role in thrombus resolution","pmids":["38385292"],"is_preprint":false}],"current_model":"SELP (P-selectin/GMP-140/CD62P) is a Ca2+-dependent lectin stored in alpha-granules of platelets and Weibel-Palade bodies of endothelial cells; upon cellular activation by thrombin, histamine, oxidants, complement C5b-9, or LPS/TLR4, it is rapidly translocated to the plasma membrane where its N-terminal lectin domain (with critical residues Lys113, Tyr48, Tyr94) binds sialyl-Lewis x–modified glycoproteins on leukocytes—principally PSGL-1 (requiring both sLex and sulfated tyrosine), but also CD44, GP Ibalpha, CD24, sulfatides, and versican—to mediate Ca2+-dependent tethering and rolling of neutrophils, monocytes, and subsets of lymphocytes on activated endothelium, while its 35-residue cytoplasmic tail directs granule targeting; engagement of PSGL-1 also triggers outside-in signaling through FGR/SYK to extend beta-2 integrins, promotes procoagulant microparticle formation, anchors ultra-large VWF strings to facilitate ADAMTS13 cleavage, activates leukocyte superoxide production and tissue factor expression, and facilitates fibrinolysis and thrombus resolution when blocked post-thrombosis."},"narrative":{"teleology":[{"year":1985,"claim":"The discovery that GMP-140 redistributes from platelet α-granule membranes to the cell surface upon thrombin activation established it as an activation-dependent surface marker and suggested a role in post-activation cell-cell interactions.","evidence":"Immunogold labeling of resting versus thrombin-stimulated human platelets","pmids":["2411738"],"confidence":"High","gaps":["No function for the surface-expressed protein was known","Endothelial expression had not been examined"]},{"year":1989,"claim":"Cloning of the SELP cDNA and parallel localization studies revealed a modular lectin-type adhesion molecule stored in both platelet α-granules and endothelial Weibel-Palade bodies, with alternative splicing generating a soluble isoform, and showed that it specifically mediates Ca²⁺-dependent adhesion of activated platelets to neutrophils and monocytes.","evidence":"cDNA sequencing, immunogold double-labeling with vWF in endothelial cells, platelet-leukocyte rosetting assays with antibody blocking and Ca²⁺ chelation, biosynthetic labeling","pmids":["2466574","2472431","2478294","2467701","2470733","2463989"],"confidence":"High","gaps":["Precise carbohydrate ligand not yet defined","Counter-receptor identity unknown","Mechanism of granule targeting not resolved"]},{"year":1990,"claim":"Gain-of-function transfection of GMP-140 into COS cells demonstrated that SELP alone is sufficient to mediate Ca²⁺-dependent neutrophil adhesion, and genomic analysis revealed a 17-exon gene with each exon encoding a distinct structural domain.","evidence":"COS cell transfection adhesion assay with purified protein controls; genomic cloning and PCR-confirmed splice variants","pmids":["1689464","1701178"],"confidence":"High","gaps":["Specific carbohydrate determinant recognized by the lectin domain still debated (Lex vs. sLex)","In vivo rolling function not yet demonstrated"]},{"year":1991,"claim":"Identification of sialyl-Lewis x as the core carbohydrate recognition motif, together with the demonstration that SELP-mediated tethering operates independently of CD18 integrins but cooperates with PAF signaling for firm adhesion, defined the two-step adhesion cascade paradigm; additional stimuli (oxidants, complement C5b-9) were shown to mobilize SELP to the endothelial surface.","evidence":"Carbohydrate competition and glycosyltransferase-transfection binding assays; antibody blocking of GMP-140 and CD11/CD18 on histamine/thrombin-stimulated endothelium; oxidant and complement stimulation with Ca²⁺/kinase inhibitors; radioligand binding with neuraminidase","pmids":["1712483","1717488","1717478","1704376","2470750","1704009","1699666"],"confidence":"High","gaps":["Identity of the high-molecular-weight glycoprotein counter-receptor not yet cloned","Signaling events downstream of leukocyte engagement unclear","Role of sulfatide binding in vivo unknown"]},{"year":1992,"claim":"Biochemical identification of a ~120 kDa glycoprotein counter-receptor on neutrophils, demonstration that the last 23 amino acids of the SELP cytoplasmic tail are necessary and sufficient for regulated granule sorting, and detection of a circulating soluble monomeric form in plasma resolved key questions about ligand identity, trafficking, and physiology.","evidence":"Affinity chromatography with ¹²⁵I-P-selectin and systematic immunodepletion; domain-swap chimeras in AtT20 cells with immunogold EM; ELISA and gel filtration of plasma SELP","pmids":["1378449","1378326","1372646"],"confidence":"High","gaps":["Counter-receptor cDNA not cloned","Structural basis of lectin-domain–ligand interaction unknown","Role of lymphocyte binding not defined in vivo"]},{"year":1993,"claim":"Expression cloning of PSGL-1 as the principal glycoprotein ligand for P-selectin, together with site-directed mutagenesis mapping the lectin-domain binding groove to residues Lys113, Tyr48, and Tyr94, established both sides of the P-selectin–ligand interface and showed that PSGL-1 requires fucosylation for function.","evidence":"HL-60 cDNA expression cloning with COS-cell reconstitution; homology-modeled mutagenesis panel with myeloid cell binding assays","pmids":["7505206","7681324","7690799"],"confidence":"High","gaps":["Crystal structure of the P-selectin–PSGL-1 complex not yet solved","Contribution of tyrosine sulfation to PSGL-1 binding unknown","Distinction between multiple P-selectin ligands in vivo not resolved"]},{"year":1997,"claim":"Identification of CD24 as an additional P-selectin ligand on neutrophils and tumor cells expanded the ligand repertoire beyond PSGL-1 and implicated P-selectin in cancer-associated platelet adhesion.","evidence":"CD24 purification, bead-based P-selectin-IgG binding, CD24 transfection into tumor cells with platelet adhesion readout","pmids":["9129046"],"confidence":"High","gaps":["Relative contribution of CD24 versus PSGL-1 in vivo not determined","Structural basis of CD24–P-selectin interaction unknown"]},{"year":1999,"claim":"GP Ibα was identified as a Ca²⁺-independent P-selectin counter-receptor whose recognition requires tyrosine sulfation but not sLex, distinguishing its binding mode from that of PSGL-1 and demonstrating ligand diversity.","evidence":"P-selectin-transfected cell adhesion to immobilized GP Ibα, rolling on histamine-stimulated endothelium, antibody blocking","pmids":["10499919"],"confidence":"High","gaps":["Structural basis of GP Ibα–P-selectin contact not defined","Functional role in platelet–platelet or platelet–VWF interactions uncertain"]},{"year":2000,"claim":"Crystal structures of the P-selectin lectin-EGF fragment co-complexed with sLex and with the sulfated N-terminus of PSGL-1 provided atomic-resolution understanding of how dual recognition of sLex and sulfated tyrosine yields high-affinity binding, and versican's chondroitin sulfate chains were identified as extracellular matrix ligands.","evidence":"X-ray crystallography of P-selectin LE domain with ligands; solid-phase binding of soluble P-selectin to versican and GAG competition","pmids":["11081633","10950950"],"confidence":"High","gaps":["Full-length P-selectin structure with all consensus repeats not determined","Role of versican binding in leukocyte recruitment in vivo untested"]},{"year":2003,"claim":"P-selectin was shown to anchor ultra-large VWF strings to endothelial surfaces and to generate procoagulant tissue-factor-bearing microparticles through PSGL-1 engagement, linking SELP directly to coagulation and thrombus propagation.","evidence":"Co-immunoprecipitation from histamine-activated endothelium, AFM bond-strength measurement, Psgl1⁻/⁻ mouse microparticle studies, hemophilia A mouse rescue by microparticle infusion","pmids":["14630802","12858167"],"confidence":"High","gaps":["Mechanism by which P-selectin–VWF interaction facilitates ADAMTS13 cleavage not fully resolved","Source of tissue factor on microparticles not definitively assigned"]},{"year":2010,"claim":"Dissection of the signaling cascade downstream of PSGL-1 engagement on rolling neutrophils revealed that P-selectin triggers FGR/SYK-dependent extension of LFA-1, establishing the molecular link between selectin-mediated rolling and integrin activation.","evidence":"Microfluidic rolling assays with conformational reporter antibodies for LFA-1, kinase inhibitors, PSGL-1 blocking","pmids":["20445017"],"confidence":"High","gaps":["Full signaling cascade from PSGL-1 to FGR/SYK activation not mapped","Whether the same pathway operates for monocytes and lymphocytes untested"]},{"year":2024,"claim":"Post-thrombotic P-selectin blockade was shown to reduce leukocyte infiltration, neutrophil ROS production, monocyte tissue factor expression, and thrombus density while promoting urokinase-mediated fibrinolysis, demonstrating that P-selectin actively sustains thrombus burden after formation.","evidence":"Mouse IVC stenosis model with anti-P-selectin antibody, intravital microscopy, flow cytometry, scanning EM, uPA measurement","pmids":["38385292"],"confidence":"High","gaps":["Translatability to human venous thromboembolism not established","Whether soluble P-selectin contributes to thrombus maintenance in this model unknown"]},{"year":null,"claim":"Key unresolved questions include the full-length structure of P-selectin with all nine complement repeats, the relative in vivo contributions of non-PSGL-1 ligands (CD24, GP Ibα, CD44, versican) to different inflammatory and thrombotic contexts, the complete outside-in signaling network triggered by PSGL-1 engagement, and the therapeutic window for P-selectin blockade in human thromboinflammatory disease.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length crystal or cryo-EM structure","Relative ligand contributions in different disease models remain genetically unresolved","Clinical translation data not captured in the mechanistic timeline"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[3,8,10,12,16,39,40]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[28,36,39]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,2,4,5,22]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,5,8,38]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,23]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16,28,39,40,42]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[36,42]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[3,8,16,40]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,2,5,22]}],"complexes":[],"partners":["SELPLG","VWF","CD24","GP1BA","VCAN","FGR","SYK","TLR4"],"other_free_text":[]},"mechanistic_narrative":"P-selectin (SELP/CD62P/GMP-140) is a Ca²⁺-dependent lectin that functions as the principal rapid-response adhesion receptor on activated platelets and endothelial cells, mediating the initial tethering and rolling of neutrophils, monocytes, and lymphocyte subsets on the vascular wall during inflammation and hemostasis. Stored in platelet α-granules and endothelial Weibel-Palade bodies alongside von Willebrand factor, SELP is mobilized to the plasma membrane within minutes by thrombin, histamine, oxidants, or complement C5b-9; its 35-residue cytoplasmic tail is necessary and sufficient for granule targeting, and an alternatively spliced soluble form circulates in plasma [PMID:2411738, PMID:2472431, PMID:1378326, PMID:1372646]. The N-terminal lectin domain recognizes sialyl-Lewis x on glycoprotein ligands—principally PSGL-1 (which also requires tyrosine sulfation for high-affinity binding), but also CD24, GP Ibα, CD44, sulfatides, and the chondroitin sulfate chains of versican—through a shallow binding groove defined by critical residues Lys113, Tyr48, and Tyr94 [PMID:7505206, PMID:11081633, PMID:7681324, PMID:9129046, PMID:10499919, PMID:10950950]. Beyond adhesion, engagement of PSGL-1 triggers outside-in signaling through FGR/SYK to extend β₂ integrins on rolling leukocytes, induces procoagulant tissue-factor-bearing microparticle release, anchors ultra-large VWF strings to endothelium, promotes neutrophil superoxide production, and—when blocked after thrombus formation—facilitates fibrinolysis and thrombus resolution [PMID:20445017, PMID:12858167, PMID:14630802, PMID:7690799, PMID:38385292]."},"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. Mediates the interaction of activated endothelial cells or platelets with leukocytes. The ligand recognized is sialyl-Lewis X. Mediates rapid rolling of leukocyte rolling over vascular surfaces during the initial steps in inflammation through interaction with SELPLG. Mediates cell-cell interactions and cell adhesion via the interaction with integrin alpha-IIb/beta3 (ITGA2B:ITGB3) and integrin alpha-V/beta-3 (ITGAV:ITGB3) (PubMed:37184585)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P16109/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SELP","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SELP","total_profiled":1310},"omim":[{"mim_id":"621242","title":"ZINC FINGER PROTEIN 429; ZNF429","url":"https://www.omim.org/entry/621242"},{"mim_id":"619130","title":"THROMBOCYTOPENIA 7; THC7","url":"https://www.omim.org/entry/619130"},{"mim_id":"616627","title":"PODOCALYXIN-LIKE 2; PODXL2","url":"https://www.omim.org/entry/616627"},{"mim_id":"611691","title":"SUSHI, VON WILLEBRAND FACTOR TYPE A, EGF, AND PENTRAXIN DOMAINS-CONTAINING 1; SVEP1","url":"https://www.omim.org/entry/611691"},{"mim_id":"609714","title":"TRIGGERING RECEPTOR EXPRESSED ON MYELOID CELLS-LIKE PROTEIN 1; TREML1","url":"https://www.omim.org/entry/609714"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SELP"},"hgnc":{"alias_symbol":["CD62","PSEL","PADGEM","GMP140","CD62P","GMP-140"],"prev_symbol":["GRMP"]},"alphafold":{"accession":"P16109","domains":[{"cath_id":"3.10.100.10","chopping":"39-162","consensus_level":"high","plddt":89.9766,"start":39,"end":162},{"cath_id":"2.10.70.10","chopping":"199-260","consensus_level":"medium","plddt":87.1032,"start":199,"end":260},{"cath_id":"2.10.70.10","chopping":"262-322","consensus_level":"medium","plddt":81.3362,"start":262,"end":322},{"cath_id":"2.10.70.10","chopping":"334-384","consensus_level":"medium","plddt":86.8388,"start":334,"end":384},{"cath_id":"2.10.70.10","chopping":"396-446","consensus_level":"medium","plddt":85.2663,"start":396,"end":446},{"cath_id":"2.10.70.10","chopping":"458-508","consensus_level":"medium","plddt":88.6867,"start":458,"end":508},{"cath_id":"2.10.70.10","chopping":"520-570","consensus_level":"medium","plddt":87.889,"start":520,"end":570},{"cath_id":"2.10.70.10","chopping":"582-630","consensus_level":"high","plddt":82.1431,"start":582,"end":630},{"cath_id":"2.10.70.10","chopping":"652-702","consensus_level":"medium","plddt":81.9633,"start":652,"end":702},{"cath_id":"2.10.70.10","chopping":"704-765","consensus_level":"medium","plddt":82.0694,"start":704,"end":765}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P16109","model_url":"https://alphafold.ebi.ac.uk/files/AF-P16109-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P16109-F1-predicted_aligned_error_v6.png","plddt_mean":79.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SELP","jax_strain_url":"https://www.jax.org/strain/search?query=SELP"},"sequence":{"accession":"P16109","fasta_url":"https://rest.uniprot.org/uniprotkb/P16109.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P16109/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P16109"}},"corpus_meta":[{"pmid":"1689464","id":"PMC_1689464","title":"Rapid 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/10499919","citation_count":266,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9129046","id":"PMC_9129046","title":"CD24, a mucin-type glycoprotein, is a ligand for P-selectin on human tumor cells.","date":"1997","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/9129046","citation_count":265,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12858167","id":"PMC_12858167","title":"Interaction of P-selectin and PSGL-1 generates microparticles that correct hemostasis in a mouse model of hemophilia A.","date":"2003","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/12858167","citation_count":248,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15059608","id":"PMC_15059608","title":"Role of platelet P-selectin and microparticle PSGL-1 in thrombus formation.","date":"2004","source":"Trends in molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/15059608","citation_count":235,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10950950","id":"PMC_10950950","title":"Binding of a large chondroitin sulfate/dermatan sulfate proteoglycan, versican, to L-selectin, P-selectin, and CD44.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10950950","citation_count":224,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20167578","id":"PMC_20167578","title":"Large-scale genomic studies reveal central role of ABO in sP-selectin and sICAM-1 levels.","date":"2010","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20167578","citation_count":215,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16648968","id":"PMC_16648968","title":"P-selectin mediates adhesion of leukocytes, platelets, and cancer cells in inflammation, thrombosis, and cancer growth and metastasis.","date":"2006","source":"Archivum immunologiae et therapiae experimentalis","url":"https://pubmed.ncbi.nlm.nih.gov/16648968","citation_count":194,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21642543","id":"PMC_21642543","title":"Alternative pathway activation of complement by Shiga toxin promotes exuberant C3a formation that triggers microvascular thrombosis.","date":"2011","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/21642543","citation_count":180,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1701178","id":"PMC_1701178","title":"Structure of the human gene encoding granule membrane protein-140, a member of the selectin family of adhesion receptors for leukocytes.","date":"1990","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1701178","citation_count":176,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14630802","id":"PMC_14630802","title":"P-selectin anchors newly released ultralarge von Willebrand factor multimers to the endothelial cell surface.","date":"2003","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/14630802","citation_count":166,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19913121","id":"PMC_19913121","title":"Gene-centric association signals for lipids and apolipoproteins identified via the HumanCVD BeadChip.","date":"2009","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19913121","citation_count":164,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7680663","id":"PMC_7680663","title":"Higher-affinity oligosaccharide ligands for E-selectin.","date":"1993","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/7680663","citation_count":160,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21071696","id":"PMC_21071696","title":"P-selectin-mediated platelet-neutrophil aggregate formation activates neutrophils in mouse and human sickle cell disease.","date":"2010","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/21071696","citation_count":155,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12165563","id":"PMC_12165563","title":"Specific haplotypes of the P-selectin gene are associated with myocardial infarction.","date":"2002","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12165563","citation_count":153,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21658254","id":"PMC_21658254","title":"Chondroitin sulfates play a major role in breast cancer metastasis: a role for CSPG4 and CHST11 gene expression in forming surface P-selectin ligands in aggressive breast cancer cells.","date":"2011","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/21658254","citation_count":143,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17192395","id":"PMC_17192395","title":"Comparative gene expression profiling of in vitro differentiated megakaryocytes and erythroblasts identifies novel activatory and inhibitory platelet membrane proteins.","date":"2006","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/17192395","citation_count":142,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20445017","id":"PMC_20445017","title":"Rolling on E- or P-selectin induces the extended but not high-affinity conformation of LFA-1 in neutrophils.","date":"2010","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/20445017","citation_count":138,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51400,"output_tokens":7628,"usd":0.13431},"stage2":{"model":"claude-opus-4-6","input_tokens":11367,"output_tokens":3890,"usd":0.231128},"total_usd":0.79356,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":65050,"output_tokens":10662,"usd":0.17754},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":14816,"output_tokens":3719,"usd":0.250582}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1985,\n      \"finding\": \"GMP-140 (SELP/P-selectin) is stored in alpha-granule membranes of resting platelets and is rapidly redistributed to the plasma membrane upon thrombin stimulation, demonstrating activation-dependent surface expression.\",\n      \"method\": \"Immunocytochemistry with immunogold labeling on frozen thin sections and surface replicas of resting and thrombin-stimulated platelets\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct subcellular localization with immunogold EM, multiple antibodies, quantitative comparison of resting vs. activated platelets\",\n      \"pmids\": [\"2411738\"],\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; upon histamine stimulation it rapidly redistributes to the plasma membrane, paralleling vWF secretion.\",\n      \"method\": \"Immunoperoxidase tissue distribution, [35S]cysteine biosynthetic labeling, immunogold double-label EM, and flow cytometry on histamine-stimulated endothelial cells\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (EM colocalization with vWF, biosynthesis labeling, functional stimulation) in a single study\",\n      \"pmids\": [\"2472431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"PADGEM/GMP-140 mediates adhesion of activated platelets to neutrophils and monocytes; this interaction is Ca2+-dependent, inhibited by anti-PADGEM antibodies and EDTA, and requires a specific receptor on myeloid cells.\",\n      \"method\": \"Platelet-leukocyte adhesion assay with antibody blocking, PADGEM-containing phospholipid vesicle binding, and cell-type specificity analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional adhesion assay with antibody inhibition, vesicle reconstitution, and receptor specificity controls; replicated across multiple cell types\",\n      \"pmids\": [\"2478294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"PADGEM/GMP-140 is localized exclusively to Weibel-Palade body membranes in endothelial cells, confirmed by double-label immunofluorescence co-staining with vWF; stimulation causes disappearance of these structures indicating secretion-coupled membrane fusion.\",\n      \"method\": \"Immunofluorescence double-labeling with anti-PADGEM (KC4) and anti-vWF antibodies in permeabilized endothelial cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal colocalization with established Weibel-Palade body marker, functional stimulation confirmation, replicated findings from independent lab\",\n      \"pmids\": [\"2467701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Stimulated secretion of vWF from endothelial cells results in rapid GMP-140 redistribution to the plasma membrane via granule-membrane fusion, followed by endocytic removal of GMP-140 from the surface.\",\n      \"method\": \"Dual-label immunofluorescence, dose-dependent S12 antibody binding with agonist stimulation (histamine, thrombin, PMA, A23187), fixed vs. live cell comparison to distinguish insertion from internalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — kinetic analysis with multiple agonists, fixed vs. live cell controls, mechanistic distinction of insertion vs. endocytic retrieval\",\n      \"pmids\": [\"2470733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 is a cysteine-rich, heavily glycosylated protein (28.8% carbohydrate by weight) with a large extracytoplasmic domain; N-linked oligosaccharides account for >50 kDa of apparent molecular weight; the protein is synthesized as a 98–125 kDa precursor that matures to 140 kDa within 40–60 min.\",\n      \"method\": \"Amino acid composition analysis, enzymatic removal of N-linked oligosaccharides, pulse-chase biosynthesis labeling with [35S]cysteine in HEL cells, protease treatment of activated platelets\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple biochemical methods establishing structural properties with rigorous controls\",\n      \"pmids\": [\"2463989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"C5b-9 complement complex induces GMP-140 surface expression on endothelial cells via a Ca2+-influx-dependent mechanism, linking complement activation to P-selectin-mediated neutrophil adhesion.\",\n      \"method\": \"Complement activation on antibody-sensitized endothelial cells, C8-deficient serum controls, cytosolic Ca2+ measurements, vWF secretion assay, GMP-140 surface expression detection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mechanistic dissection with complement-component-deficient controls, Ca2+ measurement, and specific inhibitors\",\n      \"pmids\": [\"2470750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 binds to heparin in a divalent cation-independent, saturable manner; binding is inhibited by excess heparin, fucoidan, and dextran sulfate but not by chondroitin sulfates.\",\n      \"method\": \"Heparin-Sepharose affinity chromatography, radioiodinated GMP-140 binding assay to heparin-Matrex-Pel beads with competitive inhibitors\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding assay with saturation and specificity controls; single lab, single paper\",\n      \"pmids\": [\"2480118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"GMP-140 expressed on activated endothelium mediates rapid neutrophil adhesion; neutrophils and HL-60 cells bind specifically to COS cells transfected with GMP-140 cDNA and to purified GMP-140; binding requires extracellular Ca2+ but not active neutrophil metabolism.\",\n      \"method\": \"COS cell transfection with GMP-140 cDNA, cell binding assay, antibody inhibition, histamine/phorbol ester stimulation of endothelial cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — transfection reconstitution establishing sufficiency, antibody inhibition confirming specificity, replicated with purified protein; foundational paper with >900 citations\",\n      \"pmids\": [\"1689464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"PADGEM/GMP-140 recognizes the CD15 (lacto-N-fucopentaose III, Lewis x) carbohydrate antigen on neutrophils and monocytes as a component of its ligand; only anti-CD15 antibodies (among a panel) blocked leukocyte binding to PADGEM.\",\n      \"method\": \"Anti-leukocyte antibody panel screening in platelet rosetting assay, inhibition with purified CD15 oligosaccharide, COS cell transfection with PADGEM cDNA\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — carbohydrate inhibition with defined structures, transfected cell binding, antibody panel specificity; >340 citations\",\n      \"pmids\": [\"1699666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Soluble GMP-140 in fluid phase inhibits CD18-dependent adhesion of TNF-α-activated neutrophils to resting endothelium but not resting neutrophils to activated endothelium, indicating a selective anti-inflammatory role for circulating P-selectin.\",\n      \"method\": \"Neutrophil adhesion assay to plastic-coated GMP-140 and to endothelium, soluble GMP-140 inhibition experiments with TNF-α-activated neutrophils\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional adhesion assay with defined agonist conditions and mechanistic distinction between adhesion pathways\",\n      \"pmids\": [\"1696029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (P-selectin) expressed by activated endothelium acts cooperatively with PAF in a juxtacrine system: GMP-140 tethers PMNs via a receptor without requiring CD11/CD18 activation, while PAF activates CD11/CD18-dependent adhesion; GMP-140 also potentiates PAF-receptor signaling downstream.\",\n      \"method\": \"Endothelial cell stimulation with histamine/thrombin, antibody blocking of GMP-140 and CD11/CD18, purified GMP-140 competition experiments, PMN adhesion assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection of two cooperative adhesion pathways with specific antibody inhibitors and purified protein competition; >580 citations\",\n      \"pmids\": [\"1717478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Hydrogen peroxide and other oxidants induce sustained GMP-140 surface expression on endothelial cells (1–4 hours), mediating prolonged PMN adhesion; this effect does not require protein synthesis, implicating redistribution from intracellular stores.\",\n      \"method\": \"Oxidant treatment of endothelial cells, anti-GMP-140 antibody blocking, cycloheximide inhibition controls, PMN adhesion assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic distinction from ELAM-1 induction, protein synthesis independence established, antibody blocking specificity; >580 citations\",\n      \"pmids\": [\"1704376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 binds to a constitutively expressed glycoprotein receptor on neutrophils containing sialic acid residues essential for function; binding is Ca2+-dependent, reversible, saturable (~1.5 nM KD), and abolished by proteases or neuraminidase treatment.\",\n      \"method\": \"Radioligand binding assay with [125I]GMP-140, Ca2+-dependence tests, protease treatment, neuraminidase from multiple sources with different sialic acid linkage specificities, anti-Lex antibody and neoglycoproteins as controls\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative radioligand binding with saturation kinetics, enzymatic dissection of sugar linkage requirements; rigorous specificity controls\",\n      \"pmids\": [\"1704009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"P-selectin (CD62) recognizes sialylated, fucosylated lactosaminoglycans—specifically sialyl Lewis x (sLex, Neu5Ac α2-3Gal β1-4(Fuc α1-3)GlcNAc)—on myeloid and non-myeloid cells; sialic acid is required as Lewis x without sialic acid does not support binding.\",\n      \"method\": \"Binding assay with purified GMP-140 to cells naturally expressing specific oligosaccharides and to CHO cells transfected with α1-3/4 fucosyltransferase; neuraminidase-treated cell binding\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — defined cell lines with known glycan expression, enzymatic carbohydrate modification, transfected glycosyltransferase cells; >180 citations\",\n      \"pmids\": [\"1717488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Neutrophil L-selectin (LECAM-1) presents sialyl Lewis x carbohydrate ligands to vascular selectins ELAM-1 and GMP-140; LECAM-1 is concentrated on PMN microvilli and anti-LECAM-1 antibodies or selective removal inhibit PMN binding to vascular selectin transfectants by up to 70%.\",\n      \"method\": \"Flow cytometry, anti-LECAM-1 antibody blocking, selective removal of LECAM-1, binding assay to ELAM-1- and GMP-140-transfected cells, immunolocalization to PMN microvilli\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — selective removal and antibody blocking with quantitative inhibition data; >560 citations\",\n      \"pmids\": [\"1716182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"CD62/P-selectin recognizes sialyl Lewis x carbohydrate on myeloid cells via the same binding specificity as ELAM-1; both selectins mediate cell adhesion through recognition of this sialylated carbohydrate structure.\",\n      \"method\": \"Cell adhesion assays with CD62-expressing activated platelets/endothelial cells, glycan competition inhibition\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional adhesion assay with defined carbohydrate ligand; >510 citations, replicated finding\",\n      \"pmids\": [\"1712483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"CD62/P-selectin binds sulfatides (3-sulfated galactosyl ceramides) on granulocyte plasma membranes and on some tumor cells; this binding is as avid as myeloid cell binding and sulfatides can block P-selectin/myeloid cell interactions.\",\n      \"method\": \"Sulfatide adsorption to plastic, CD62 binding assay, granulocyte sulfatide excretion measurement, inhibition of myeloid cell binding by sulfatides\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding reconstitution with purified lipids, functional inhibition assay; >285 citations\",\n      \"pmids\": [\"1717159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 inhibits superoxide anion release by neutrophils upon TNF-α activation; neutrophils adherent to GMP-140-coated surfaces fail to spread and show reduced respiratory burst; the effect is reversible and GMP-140-specific.\",\n      \"method\": \"Superoxide anion generation assay, neutrophil spreading morphology, reversibility by washing, Fab antibody inhibition\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional assay with specific Fab inhibition, reversibility controls, multiple activators tested; >117 citations\",\n      \"pmids\": [\"1706523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"P-selectin (CD62) granule-membrane protein is also present on platelet dense granule membranes (in addition to alpha-granules), shown by double-label immunoelectron microscopy with anti-granulophysin antibody.\",\n      \"method\": \"Immunoelectron microscopy on frozen thin sections, double-label experiments with anti-granulophysin (D545) and anti-P-selectin antibodies, surface expression comparison after thrombin stimulation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — immunogold EM with double labeling confirming dual granule localization\",\n      \"pmids\": [\"1377048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The cytoplasmic domain of P-selectin is both necessary and sufficient for sorting into the regulated secretory pathway; deletion of the last 23 amino acids redirects P-selectin to the plasma membrane, and the cytoplasmic tail can redirect a plasma membrane protein (tissue factor) to granules.\",\n      \"method\": \"Transfection of COS-7, CHO-K1, and AtT20 cells with wild-type and truncation mutants of P-selectin; chimeric tissue factor-P-selectin cytoplasmic tail construct; immunogold EM of AtT20 granules; 8-Br-cAMP stimulation for regulated secretion\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — domain-swap mutagenesis with gain-of-function and loss-of-function in regulated secretory cell line, confirmed by EM\",\n      \"pmids\": [\"1378326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin binds to a specific ~250 kDa (non-reduced) / ~120 kDa (reduced) glycoprotein ligand on myeloid cells; binding is Ca2+-dependent, requires sialic acid but not N-linked glycans, and the ligand is distinct from lamp-1, lamp-2, L-selectin, and leukosialin.\",\n      \"method\": \"[125I]P-selectin blotting of neutrophil/HL-60 membrane extracts, affinity chromatography of [3H]glucosamine-labeled extracts, sialidase and PNGase F treatment, Western blot immunodepletion\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — affinity purification and identification of specific ligand with enzymatic dissection; >450 citations\",\n      \"pmids\": [\"1378449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin (GMP-140) is present as a circulating soluble protein in plasma (as monomer, lacking transmembrane domain), functionally capable of binding the same neutrophil receptor as membrane-bound GMP-140.\",\n      \"method\": \"ELISA detection of soluble GMP-140 in plasma ultracentrifuged at 100,000g, purification from plasma, analytical gel filtration (monomer vs. tetramer), immunoblotting, neutrophil binding competition\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — protein purified from plasma, biochemically characterized, functional binding demonstrated; >258 citations\",\n      \"pmids\": [\"1372646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin binds to subpopulations of CD4+, CD8+, and CD16+ lymphocytes (particularly CD45RO+ memory cells) and can mediate adhesion of activated platelets to lymphocytes; binding requires Ca2+ and sialic acid.\",\n      \"method\": \"Multi-color immunofluorescence flow cytometry with purified P-selectin, sialidase treatment, Ca2+-chelation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — flow cytometry with purified protein and enzymatic controls; single lab, single method\",\n      \"pmids\": [\"1378721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"GMP-140 binds to chronically antigen-stimulated CD4+ T cells via a sialic acid- and divalent cation-dependent mechanism, and modulates their cytokine production (augmenting GM-CSF, inhibiting IL-8) in conjunction with anti-TCR stimulation.\",\n      \"method\": \"GMP-140-IgG fusion protein binding assay, neuraminidase/trypsin treatment, EDTA chelation, sulfated glycan inhibition, cytokine ELISA\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — fusion protein binding with enzymatic and pharmacological specificity controls, functional cytokine readout; single lab\",\n      \"pmids\": [\"1378017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"P-selectin lectin domain mediates myeloid cell binding through residues in a shallow groove (Lys113, Tyr48, Tyr94) homologous to the rat mannose-binding protein structure; single alanine substitutions at these positions abolish binding.\",\n      \"method\": \"Homology modeling based on rat MBP crystal structure, site-directed mutagenesis of P-selectin lectin domain, myeloid cell binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-guided mutagenesis with functional binding assay; multiple critical residues identified\",\n      \"pmids\": [\"7681324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"P-selectin binding sites for myeloid cells and sulfatides are overlapping; Tyr48Ser and Lys113Arg substitutions abolish binding to both HL60 cells and sulfatides, indicating a shared binding pocket requiring precise stereochemistry.\",\n      \"method\": \"Site-directed mutagenesis of P-selectin lectin domain, HL60 cell binding assay, sulfatide binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with two independent ligand binding assays confirming overlapping site\",\n      \"pmids\": [\"7508745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"P-selectin expressed by activated platelets induces superoxide anion release by monocytes and neutrophils; this activation requires direct cell contact through P-selectin (not soluble factors), and is blocked by anti-P-selectin antibody, anti-sialyl Lewis x antibody, or soluble P-selectin fusion protein.\",\n      \"method\": \"Co-culture of thrombin-activated platelets with monocytes/neutrophils, membrane preparation vs. supernatant comparison, antibody blocking, soluble P-selectin fusion protein inhibition, superoxide anion measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — membrane vs. supernatant dissection, multiple blocking strategies including fusion protein competition; >200 citations\",\n      \"pmids\": [\"7690799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"P-selectin binds primitive human hematopoietic progenitors (CD34+ cells) in a sialic acid-dependent, protease-sensitive, temperature-independent manner; PSGL-1 is expressed on CD34+ cells and may be an important P-selectin ligand on hematopoietic progenitors.\",\n      \"method\": \"P-selectin binding assay to CD34+ cells, neuraminidase treatment, anti-P-selectin antibody blocking, HECA-452 antibody blocking, RT-PCR for PSGL-1\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple specificity controls (enzymatic, antibody, molecular detection of ligand); single lab\",\n      \"pmids\": [\"7540063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"P-selectin (CD62P) enhances leukocyte function at the thrombus site: P-selectin-coated beads increase neutrophil reactive oxygen species production and tissue factor expression by classical monocytes in vitro; blocking P-selectin post-thrombus reduces neutrophil and Ly6Chigh monocyte infiltration, decreases thrombus density, increases urokinase-type plasminogen activator levels, and accelerates venous thrombosis resolution.\",\n      \"method\": \"Inferior vena cava stenosis mouse model, P-selectin blocking antibody administration post-thrombus, intravital microscopy, flow cytometry of platelet-leukocyte aggregates, scanning electron microscopy, ROS production assay with P-selectin-coated beads, tissue factor expression by monocytes, uPA measurement\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro mechanistic assays with P-selectin-coated beads plus in vivo mouse model with multiple orthogonal readouts\",\n      \"pmids\": [\"38385292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MiR-26b and miR-140 directly regulate SELP (P-selectin) mRNA levels in megakaryocytes; overexpression or inhibition of these miRNAs in MEG-01 cells correspondingly alters SELP mRNA levels, with hyperglycemia reducing these miRNAs and increasing SELP mRNA.\",\n      \"method\": \"miRNA overexpression/inhibition with mimics and anti-miRNAs in MEG-01 megakaryocytes, RT-qPCR for SELP mRNA, flow cytometry for surface P-selectin\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function miRNA manipulation with mRNA readout; single lab\",\n      \"pmids\": [\"27975100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ADP-induced CD62P (P-selectin) expression on platelets requires co-activation of both P2Y1 and P2Y12 receptors; P2Y12 activation is the key event driving PI3K (Akt1 phosphorylation), while P2Y1 creates a high cytosolic Ca2+ environment conducive to PI3K activity; this is upstream of PLC, IP3 receptor, calmodulin, and PI3K signaling.\",\n      \"method\": \"Selective P2Y1 (MRS2500) and P2Y12 (PSB0739) receptor antagonists, PLC inhibitor (U73122), IP3 receptor antagonist (2-APB), calmodulin inhibitor (calmidazolium), PI3K inhibitor (wortmannin), flow cytometry for CD62P and neutrophil-platelet aggregates, Akt1 phosphorylation western blot\",\n      \"journal\": \"Pharmaceuticals\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple selective pharmacological inhibitors dissecting the signaling cascade, downstream Akt1 phosphorylation as readout; orthogonal methods\",\n      \"pmids\": [\"33255391\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"P-selectin (SELP/GMP-140/CD62P) is a Ca2+-dependent lectin stored in alpha-granule and dense granule membranes of platelets and Weibel-Palade bodies of endothelial cells; upon activation by thrombin, histamine, oxidants, or complement (C5b-9), it rapidly translocates to the plasma membrane via granule-membrane fusion (directed by its cytoplasmic tail), where it mediates rolling and tethering of neutrophils, monocytes, and subsets of lymphocytes and hematopoietic progenitors by binding sialylated, fucosylated lactosaminoglycan ligands (principally sialyl Lewis x on PSGL-1) through a lectin domain whose binding pocket requires Lys113, Tyr48, and Tyr94; it also cooperates with PAF in a juxtacrine signaling system to potentiate CD11/CD18-dependent firm adhesion, activates leukocyte oxidative burst and tissue factor expression via direct contact, and is shed or alternatively spliced to generate a circulating soluble form with anti-inflammatory activity; its surface expression is regulated upstream by P2Y1/P2Y12 co-signaling through PLC/Ca2+ and PI3K/Akt, and at the transcriptional level by miR-26b and miR-140.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1985,\n      \"finding\": \"GMP-140 (SELP/P-selectin) is an alpha-granule membrane protein of platelets that is redistributed to the plasma membrane upon thrombin stimulation, as demonstrated by immunogold labeling of resting versus activated platelets.\",\n      \"method\": \"Immunocytochemistry with monoclonal antibody S12, immunogold labeling, and saponin permeabilization on resting and thrombin-stimulated platelets\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct subcellular localization by immunogold with functional context, replicated by multiple groups\",\n      \"pmids\": [\"2411738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) cDNA encodes a cysteine-rich protein with modular domains: an N-terminal lectin domain, an EGF-like domain, nine tandem complement-binding consensus repeats, a transmembrane domain, and a cytoplasmic tail. Alternative splicing predicts a soluble secreted form lacking the transmembrane segment.\",\n      \"method\": \"cDNA cloning and sequence analysis from platelet/endothelial cell libraries\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — primary sequence determination with structural domain identification, foundational molecular characterization\",\n      \"pmids\": [\"2466574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) is synthesized by vascular endothelial cells and is stored in Weibel-Palade bodies, co-localizing with von Willebrand factor, as demonstrated by immunogold double-labeling; histamine stimulation rapidly redistributes GMP-140 to the plasma membrane.\",\n      \"method\": \"Immunoperoxidase tissue distribution, [35S]cysteine biosynthetic labeling, immunogold double-label on frozen thin sections, histamine stimulation\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct subcellular localization by immunogold with co-localization and functional stimulus, replicated by multiple groups\",\n      \"pmids\": [\"2472431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"PADGEM/GMP-140 (SELP) on activated platelets mediates adhesion to neutrophils, monocytes, HL-60, and U937 cells; this interaction is inhibited by anti-PADGEM antibodies and EDTA (Ca2+-dependence), but not by anti-GPIIb-IIIa or anti-thrombospondin antibodies, establishing SELP as the specific adhesion receptor.\",\n      \"method\": \"Platelet-leukocyte rosetting assay, antibody blocking, phospholipid vesicle binding assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal inhibition with specific antibodies and reconstitution with vesicles, replicated across multiple cell types\",\n      \"pmids\": [\"2478294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"PADGEM/GMP-140 (SELP) is localized to Weibel-Palade bodies of endothelial cells (co-localizing with vWF by double immunofluorescence), and disappears from these structures upon secretagogue stimulation.\",\n      \"method\": \"Immunofluorescence double-labeling with anti-PADGEM and anti-vWF antibodies, secretagogue stimulation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-localization by double-label immunofluorescence, confirmed by secretagogue-induced disappearance\",\n      \"pmids\": [\"2467701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) stimulated secretion from endothelial Weibel-Palade bodies is accompanied by rapid redistribution of GMP-140 to the cell surface, occurring within 3 min of histamine stimulation and subsequently removed by an endocytic mechanism; surface expression is agonist-dose dependent and parallels vWF secretion.\",\n      \"method\": \"Dual-label immunofluorescence, monoclonal antibody S12 binding kinetics, paraformaldehyde fixation and 4°C arrest to trap surface expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative kinetic analysis of surface redistribution with multiple agonists and mechanistic controls\",\n      \"pmids\": [\"2470733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) contains 28.8% carbohydrate by weight (including sialic acid, neutral sugars, N-acetylglucosamine), and N-linked oligosaccharides account for >50 kDa of apparent molecular weight. Biosynthesis involves a 98–125 kDa high-mannose precursor that matures to 140 kDa within 40–60 min. The majority of the protein mass is extracytoplasmic.\",\n      \"method\": \"Amino acid composition, enzymatic removal of N-linked oligosaccharides, pulse-chase biosynthetic labeling, protease treatment of activated platelets plus Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical characterization with multiple orthogonal methods\",\n      \"pmids\": [\"2463989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"GMP-140 (SELP) binds heparin in a divalent cation-independent manner; binding is inhibited by excess heparin and other sulfated glycans (fucoidan, dextran sulfate) but not by chondroitin sulfates, establishing GMP-140 as a heparin-binding protein.\",\n      \"method\": \"Heparin-Sepharose affinity chromatography, radioiodinated GMP-140 binding to heparin-Matrex beads with competitive inhibition assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding assay with competitive inhibition, single lab\",\n      \"pmids\": [\"2480118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"GMP-140 (SELP) expressed on activated endothelial cells mediates rapid neutrophil adhesion; neutrophils and HL-60 cells bind specifically to COS cells transfected with GMP-140 cDNA and to purified GMP-140-coated surfaces; binding requires extracellular Ca2+ but not active neutrophil metabolism.\",\n      \"method\": \"COS cell transfection with GMP-140 cDNA, adhesion assays with purified protein-coated microtiter wells, antibody blocking, metabolic inhibitors, Ca2+ chelation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function transfection combined with purified protein adhesion assay and multiple controls, highly cited foundational paper\",\n      \"pmids\": [\"1689464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"GMP-140 (SELP) gene spans >50 kb and contains 17 exons, with almost all exons encoding distinct structural domains (lectin, EGF, each of the nine consensus repeats, transmembrane region). The soluble and 8-repeat variant forms arise from alternative splicing of distinct exons.\",\n      \"method\": \"Genomic library cloning, restriction mapping, exon sequencing, PCR amplification of alternative transcripts from platelet and endothelial cell RNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete genomic structure determination with PCR confirmation of alternative splice forms\",\n      \"pmids\": [\"1701178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"CD15 (lacto-N-fucopentaose III, Lex) on neutrophils and monocytes is a component of the PADGEM/GMP-140 (SELP) ligand; anti-CD15 antibodies inhibit leukocyte-platelet binding, and the CD15 trisaccharide directly inhibits binding of HL-60 cells to PADGEM-expressing COS cells and purified PADGEM vesicles.\",\n      \"method\": \"Antibody blocking with panel of anti-leukocyte antibodies, carbohydrate inhibition assays with synthetic oligosaccharides, COS-cell PADGEM transfection adhesion assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (antibody blocking + carbohydrate competition + transfection system), replicated\",\n      \"pmids\": [\"1699666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) binds to a glycoprotein receptor on neutrophils via a lectin-like mechanism; binding is Ca2+-dependent, reversible, saturable (~1.5 nM half-maximal), and abolished by protease treatment or neuraminidase (alpha 2-3 and alpha 2-8 linked sialic acids). Anti-CD15 (Lex) antibody does not block binding, indicating that sialic acid-containing structures beyond simple Lex are required.\",\n      \"method\": \"Radioligand binding assay with [125I]GMP-140, enzyme treatments (protease, neuraminidase), blocking antibodies, Ca2+ chelation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative radioligand binding with enzyme dissection of ligand requirements, rigorous controls\",\n      \"pmids\": [\"1704009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"CD62/P-selectin (SELP) and ELAM-1 recognize the same carbohydrate ligand, sialyl-Lewis x (sLex), on neutrophils and monocytes; binding of CD62-expressing cells to sLex structures was demonstrated by cell adhesion assays.\",\n      \"method\": \"Cell adhesion assays using sLex-expressing cells versus control cells, antibody blocking\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct cell adhesion assay with defined carbohydrate ligand, independently confirmed by multiple groups\",\n      \"pmids\": [\"1712483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) recognizes alpha(2-3)sialylated, alpha(1-3)fucosylated lactosaminoglycans (sialyl Lewis x sequence) on both myeloid and non-myeloid cells; sialic acid is required (cells expressing Lex without sialyl-Lex do not bind), but HL-60 myeloid cells bind with higher affinity than CHO cells expressing sLex alone, indicating additional structural requirements beyond the minimal tetrasaccharide.\",\n      \"method\": \"Purified GMP-140 binding to cells naturally expressing specific oligosaccharides and cells transfected with glycosyltransferase cDNAs; neuraminidase treatment\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic comparison across cell types with defined glycosyltransferase expression, multiple controls\",\n      \"pmids\": [\"1717488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"CD62/P-selectin (SELP) binds to sulfatides (3-sulfated galactosyl ceramides), which constitute the principal ligand on some tumor cell plasma membranes and are excreted by granulocytes; sulfatides adsorbed to plastic bind CD62 as avidly as myeloid or tumor cells, suggesting a role in facilitating leukocyte disengagement from CD62 at inflammatory sites.\",\n      \"method\": \"Cell adhesion assays to sulfatide-coated plastic, competition with sulfatides, granulocyte sulfatide excretion measurement\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding to purified ligand with functional competition assay\",\n      \"pmids\": [\"1717159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"LECAM-1 (L-selectin) on neutrophils presents sialyl Lewis x oligosaccharide ligands to GMP-140 (SELP) and ELAM-1 on vascular endothelium; LECAM-1 is concentrated on neutrophil microvilli and anti-LECAM-1 antibodies or removal of surface LECAM-1 inhibit neutrophil binding to GMP-140/ELAM-1 transfectants by up to 70%.\",\n      \"method\": \"Cell binding assays to selectin-transfected cells, anti-LECAM-1 antibody blocking, selective LECAM-1 removal, immunolocalization to microvilli\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple blocking approaches with transfected cell system, identifies trans-presentation mechanism\",\n      \"pmids\": [\"1716182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"GMP-140 (SELP) on activated endothelium tethers neutrophils without requiring CD11/CD18 integrin activation, but potentiates subsequent PAF-induced CD11/CD18-dependent firm adhesion. Coexpression of GMP-140 and PAF by histamine- or thrombin-stimulated endothelium is required for maximal PMN adhesion through a juxtacrine mechanism.\",\n      \"method\": \"Antibody blocking of GMP-140 and CD11/CD18, fluid-phase GMP-140 competition, purified GMP-140 functional assays, histamine/thrombin stimulation of endothelial cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection of two-step adhesion cascade with multiple antibody blockers and purified protein, defines pathway position\",\n      \"pmids\": [\"1717478\"],\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, promoting neutrophil adhesion; this process does not require de novo protein synthesis and is completely blocked by anti-GMP-140 antibody or soluble GMP-140.\",\n      \"method\": \"Oxidant treatment of endothelial cells, neutrophil adhesion assay, antibody blocking, protein synthesis inhibition, antioxidant treatment\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — specific mechanistic dissection with inhibitors and antibody blocking, defines oxidant-triggered GMP-140 mobilization\",\n      \"pmids\": [\"1704376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Complement C5b-9 induces surface expression of GMP-140 (SELP) on endothelial cells via Ca2+ influx across the plasma membrane; the response is blocked by removal of external calcium and partially inhibited by sphingosine (protein kinase C inhibitor); C5b-8 without C9 is insufficient.\",\n      \"method\": \"Complement activation on antibody-sensitized endothelial cells, C8-deficient serum controls, intracellular Ca2+ measurement, external Ca2+ removal, sphingosine inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway dissection with complement-deficient sera and Ca2+/kinase inhibitors\",\n      \"pmids\": [\"2470750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Immobilized GMP-140 (SELP) supports neutrophil adhesion without CD18 integrin activation and inhibits superoxide anion generation and cell spreading; fluid-phase GMP-140 also inhibits TNF-alpha-induced superoxide generation in neutrophils, establishing an anti-inflammatory signaling role.\",\n      \"method\": \"Neutrophil adhesion to GMP-140-coated plastic, superoxide assay, anti-GMP-140 Fab reversal, TNF-alpha activation with fluid-phase GMP-140\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional assay with specific Fab reversal, defines inhibitory signaling outcome of SELP engagement\",\n      \"pmids\": [\"1706523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Soluble (fluid-phase) GMP-140 (SELP) specifically inhibits CD18-dependent adhesion of TNF-alpha-activated neutrophils to resting endothelium, but does not inhibit resting neutrophil adhesion to TNF-activated endothelium, demonstrating a selective anti-inflammatory function.\",\n      \"method\": \"Soluble GMP-140 competition assays with TNF-alpha-activated neutrophils or endothelium, CD18-blocking antibodies\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — specific functional dissection showing selectivity of soluble SELP inhibition\",\n      \"pmids\": [\"1696029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"A major glycoprotein ligand for P-selectin (SELP) on myeloid cells was identified at ~120 kDa (reducing conditions) or ~250 kDa (non-reducing); binding is Ca2+-dependent, protease-sensitive, requires sialic acid (neuraminidase abolishes binding), and is not L-selectin, LAMP-1, LAMP-2, or leukosialin.\",\n      \"method\": \"Blotting of neutrophil/HL-60 extracts with [125I]P-selectin, affinity chromatography with [3H]glucosamine-labeled extracts, enzyme treatments (sialidase, PNGase F), immunodepletion with antibodies to candidate proteins\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — affinity chromatography identification with systematic exclusion of candidates and enzyme dissection\",\n      \"pmids\": [\"1378449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The cytoplasmic domain (last 23 amino acids of the 35-residue tail) of P-selectin (SELP) is both necessary and sufficient for sorting of the protein into regulated secretory granules; deletion of this region redirects P-selectin to the plasma membrane in AtT20 cells, and replacement of tissue factor's cytoplasmic tail with the P-selectin tail redirects tissue factor to granules.\",\n      \"method\": \"Transfection of P-selectin cDNA and deletion/chimeric constructs into COS-7, CHO-K1, and AtT20 cells; immunogold electron microscopy; cAMP stimulation; Western blot\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — gain- and loss-of-function domain swapping with reconstitution of granule targeting in AtT20 cells\",\n      \"pmids\": [\"1378326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Plasma contains a soluble form of GMP-140 (SELP) at ~0.25 µg/mL in men, which lacks the transmembrane domain (consistent with alternative splicing), elutes as a monomer by gel filtration, and binds the same neutrophil receptor as membrane-bound GMP-140.\",\n      \"method\": \"ELISA detection, 100,000g ultracentrifugation, plasma protein purification, analytical gel filtration, neutrophil binding assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — protein purification from plasma with biochemical characterization and functional neutrophil binding assay\",\n      \"pmids\": [\"1372646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"P-selectin (SELP) binds to a subset of peripheral blood lymphocytes (CD4+, CD8+, CD16+, preferentially CD45RO+ memory cells) and can mediate adhesion of activated platelets to lymphocytes; binding is Ca2+-dependent and blocked by sialidase pretreatment.\",\n      \"method\": \"Multi-color immunofluorescence with purified P-selectin, platelet-lymphocyte adhesion assay, Ca2+ chelation, sialidase treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding assay with enzyme and Ca2+ controls, single lab\",\n      \"pmids\": [\"1378721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"GMP-140 (SELP) binds to chronically antigen-stimulated CD4+ T cells (but not freshly isolated T cells) via sialic acid-dependent, EDTA-sensitive (Ca2+-dependent) structures, and augments GM-CSF production while inhibiting IL-8 production upon co-stimulation with anti-TCR antibody.\",\n      \"method\": \"GMP-140-IgG Fc chimera binding assay, neuraminidase/trypsin treatment, EDTA inhibition, cytokine measurement by ELISA\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding with enzymatic dissection and cytokine functional readout, single lab\",\n      \"pmids\": [\"1378017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"GMP-140 (SELP) binds to carcinoma cells (colon, lung, breast) via a ligand distinct from that on myeloid HL-60 cells; neuraminidase treatment of breast carcinoma cells does not abolish (and sometimes increases) GMP-140 binding, whereas it abolishes binding to HL-60 cells, indicating tumor cells present a different (sialic acid-independent) P-selectin ligand.\",\n      \"method\": \"Soluble GMP-140-IgG chimera immunohistology on tumor tissue sections, binding assays to carcinoma cell lines, neuraminidase treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic comparison of ligand requirements across cell types with enzyme dissection, single lab\",\n      \"pmids\": [\"1372439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Critical residues in the lectin domain of P-selectin (SELP) required for myeloid cell binding were identified: Lys113, Tyr48, and Tyr94. Single substitutions (Lys113Ala, Tyr48Ala, Tyr48Phe, Tyr94Ala, Tyr94Phe) abolish binding. These residues form a shallow groove on the molecule modeled on the rat mannose-binding protein crystal structure.\",\n      \"method\": \"Homology modeling of lectin domain on mannose-binding protein crystal structure; site-directed mutagenesis; myeloid cell binding assays with mutant P-selectin constructs\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — active-site mutagenesis with functional validation in cell binding assay, supported by structural model\",\n      \"pmids\": [\"7681324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"P-selectin activation of monocytes and neutrophils through contact with activated platelets induces superoxide anion release; this is inhibited by anti-P-selectin antibody, anti-sialyl-Lewis X antibody, or soluble recombinant P-selectin fusion protein, establishing P-selectin-mediated outside-in signaling.\",\n      \"method\": \"Superoxide anion measurement in platelet-leukocyte co-cultures, platelet membrane fraction assays, antibody and soluble receptor blocking\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — specific inhibition by multiple independent reagents (antibody, sLex antibody, soluble receptor) with functional readout\",\n      \"pmids\": [\"7690799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The P-selectin (SELP) binding sites for myeloid cells and sulfatides are overlapping; Tyr48Ser or Lys113Arg substitutions create correctly folded but non-binding P-selectin mutants for both HL-60 cells and sulfatides, indicating these residues define the shared binding pocket.\",\n      \"method\": \"Extended mutagenesis panel with myeloid cell binding assays and sulfatide competition\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis defining shared binding site for two different ligand classes\",\n      \"pmids\": [\"7508745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Expression cloning from HL-60 cells identified PSGL-1 (P-selectin glycoprotein ligand-1) as a functional glycoprotein ligand for P-selectin (SELP); coexpression of the protein and a fucosyltransferase in COS cells is required for P-selectin binding; the ligand is expressed as a 220 kDa homodimer.\",\n      \"method\": \"Expression cloning from HL-60 cDNA library, COS-cell transfection with PSGL-1 and fucosyltransferase cDNAs, P-selectin binding assay, anti-P-selectin antibody blocking\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — expression cloning with reconstitution in COS cells, defines obligate role of fucosylation for ligand function\",\n      \"pmids\": [\"7505206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"P-selectin (SELP) binds primitive hematopoietic progenitors (CD34+ cells including CFU-GM and pre-CFU); binding requires divalent cations, is protease-sensitive, and is abolished by neuraminidase. PSGL-1 mRNA is expressed by CD34+ cells, suggesting PSGL-1 as a major P-selectin ligand on hematopoietic progenitors.\",\n      \"method\": \"P-selectin binding assays on CD34+ cells, clonogenic assays, temperature independence testing, enzyme treatments, RT-PCR for PSGL-1, anti-P-selectin antibody blocking\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding characterization with enzyme dissection, single lab\",\n      \"pmids\": [\"7540063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Platelet glycoprotein Ibalpha (part of the GP Ib-IX-V complex) is identified as a counter-receptor for P-selectin (SELP); this interaction does not require Ca2+, core-2 carbohydrate branching, or alpha(1,3)-fucosylation (unlike PSGL-1 binding) but is inhibited by sulfated proteoglycans and by antibodies to a tyrosine-sulfated region of GP Ibalpha.\",\n      \"method\": \"P-selectin-transfected cell adhesion to immobilized GP Ibalpha, GP Ibalpha-transfected cell rolling on P-selectin and histamine-stimulated endothelium, anti-P-selectin and anti-GP Ibalpha antibody blocking, Ca2+ chelation\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function transfection, rolling assay, specific antibody inhibition defining mechanistic requirements\",\n      \"pmids\": [\"10499919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Crystal structures of P-selectin lectin-EGF domain bound to sLex and to the N-terminal domain of PSGL-1 (modified by tyrosine sulfation and sLex) reveal the molecular basis of high-affinity PSGL-1 recognition: PSGL-1 sulfated tyrosine contacts the P-selectin lectin domain at a site distinct from but adjacent to the sLex binding groove.\",\n      \"method\": \"X-ray crystallography of P-selectin LE domain co-complexed with sLex and with PSGL-1 N-terminal peptide\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with bound ligands, foundational structural biology paper\",\n      \"pmids\": [\"11081633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Versican, a large chondroitin sulfate/dermatan sulfate proteoglycan, binds P-selectin (SELP) via its chondroitin sulfate (CS) chains; binding is inhibited by CS B, CS E, and heparan sulfate but not other glycosaminoglycans, and soluble P-selectin directly binds immobilized CS B and CS E.\",\n      \"method\": \"Solid-phase binding assay of P-selectin to versican, glycosaminoglycan competition, direct binding of soluble P-selectin to immobilized CS chains, cross-blocking with L-selectin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding with systematic GAG competition, defines CS-chain specificity\",\n      \"pmids\": [\"10950950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"P-selectin (SELP) anchors newly released ultralarge von Willebrand factor (ULVWF) strings to the endothelial cell surface; CHO cells expressing P-selectin adhere to immobilized ULVWF; anti-VWF antibody co-immunoprecipitates P-selectin from histamine-activated endothelial cells; anti-P-selectin antibody blocks ULVWF string formation; the minimal ULVWF-P-selectin bond strength is ~7.2 pN.\",\n      \"method\": \"CHO-P-selectin adhesion to immobilized ULVWF, co-immunoprecipitation from histamine-activated endothelium, antibody blocking of string formation, atomic force microscopy bond strength measurement\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (cell adhesion, co-IP, functional blocking, force measurement), single lab\",\n      \"pmids\": [\"14630802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"P-selectin (SELP) interaction with PSGL-1 generates procoagulant microparticles; P-sel-Ig chimeras induce microparticle formation in human blood via PSGL-1; Psgl1-/- mice produce fewer microparticles after P-sel-Ig infusion; infused microparticles bearing tissue factor bind to thrombi and enhance fibrin formation in hemophilia A mice, normalizing tail-bleeding time.\",\n      \"method\": \"P-selectin-Ig chimera treatment of human blood, Psgl1-/- mouse experiments, flow cytometry for microparticles, infusion of procoagulant microparticles into hemophilia A mice, fibrin kinetics and tail-bleeding assay\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic (Psgl1-/-) and pharmacological evidence in vivo, multiple outcome measures, defines SELP-PSGL-1 microparticle pathway\",\n      \"pmids\": [\"12858167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CD24, a mucin-type GPI-linked glycoprotein on neutrophils and tumor cells, is a ligand for P-selectin (SELP); CD24-coated beads bind P-selectin-IgG; binding depends on divalent cations and is abolished by O-sialoglycoprotein endopeptidase but not sialidase; transfection of CD24 into adenocarcinoma cells enhances P-selectin-dependent platelet binding.\",\n      \"method\": \"CD24 purification and bead coating, P-selectin-IgG binding assay, enzyme treatments, CD24 transfection, platelet adhesion assay, phospholipase C removal\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function transfection, purified ligand binding, and enzyme dissection defining novel ligand\",\n      \"pmids\": [\"9129046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Lipopolysaccharide (LPS) from EHEC O157 binds to platelets through a complex of TLR4 and CD62P (SELP), leading to platelet activation; TLR4 colocalizes with CD62P on the platelet membrane; Tlr4-deficient mice do not bind O157LPS; CD62P further contributes to LPS-triggered platelet activation on endothelial cells in perfusion experiments.\",\n      \"method\": \"Immunofluorescence co-localization of TLR4 and CD62P on platelets, Tlr4-/- mouse in vivo LPS injection, flow cytometry for platelet activation (GPIIb/IIIa, CD40L), perfusion experiments with TLR4/CD62P-blocking antibodies\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout combined with co-localization and functional blocking in perfusion model\",\n      \"pmids\": [\"16514062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rolling of human neutrophils on P-selectin (SELP) induces the extended (but not high-affinity) conformation of LFA-1 (alpha-L beta-2 integrin) through signaling dependent on PSGL-1, Src family kinase FGR, and SYK, allowing binding to immobilized extension-reporter antibodies during rolling.\",\n      \"method\": \"Human neutrophil rolling assays on P-selectin under flow, reporter antibody binding assays (KIM127, NKI-L16, mAb24), PSGL-1 blocking, kinase inhibitors, microfluidics-based reporter assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic signaling pathway dissection with specific inhibitors and novel conformational reporter assay under physiological flow\",\n      \"pmids\": [\"20445017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PSGL-1, CD44, and ESL-1 on mature leukocytes are physiologic glycoprotein ligands for P-selectin (SELP) on endothelial cells; PSGL-1 and CD44 induce signals that activate beta-2 integrin LFA-1 to promote slow rolling, while ESL-1 activates Mac-1 in adherent neutrophils.\",\n      \"method\": \"Review synthesizing in vivo mouse genetic data (knockout mice for each ligand), intravital microscopy rolling assays, signaling studies (integrin activation)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple in vivo genetic studies defining ligand-specific signaling functions\",\n      \"pmids\": [\"22021370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-26b and miR-140 directly regulate SELP (P-selectin) mRNA levels in megakaryocytes; overexpression or inhibition of these miRNAs in MEG-01 cells modulates SELP mRNA levels; hyperglycemia in type 2 diabetes suppresses these miRNAs via calpain-mediated Dicer degradation, leading to elevated SELP mRNA and platelet P-selectin surface expression.\",\n      \"method\": \"miRNA mimic/anti-miRNA transfection in MEG-01 megakaryocytes, RT-qPCR for SELP mRNA, calpain inhibitor (calpeptin) rescue, flow cytometry for surface P-selectin\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional miRNA manipulation in relevant cell type with mRNA level and surface expression readouts, single lab\",\n      \"pmids\": [\"27975100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"P-selectin/CD62P blockade after venous thrombus formation reduces monocyte and neutrophil infiltration, decreases reactive oxygen species production by neutrophils and tissue factor expression by classical monocytes, reduces thrombus density, and accelerates fibrinolysis (increased urokinase-type plasminogen activator levels) and thrombus resolution in a mouse inferior vena cava stenosis model.\",\n      \"method\": \"Mouse IVC stenosis thrombosis model, P-selectin-blocking antibody administration post-thrombus formation, intravital microscopy, flow cytometry for platelet-leukocyte aggregates, scanning electron microscopy, ROS assay, tissue factor expression, uPA measurement\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic/pharmacological model with multiple mechanistic readouts defining P-selectin's role in thrombus resolution\",\n      \"pmids\": [\"38385292\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SELP (P-selectin/GMP-140/CD62P) is a Ca2+-dependent lectin stored in alpha-granules of platelets and Weibel-Palade bodies of endothelial cells; upon cellular activation by thrombin, histamine, oxidants, complement C5b-9, or LPS/TLR4, it is rapidly translocated to the plasma membrane where its N-terminal lectin domain (with critical residues Lys113, Tyr48, Tyr94) binds sialyl-Lewis x–modified glycoproteins on leukocytes—principally PSGL-1 (requiring both sLex and sulfated tyrosine), but also CD44, GP Ibalpha, CD24, sulfatides, and versican—to mediate Ca2+-dependent tethering and rolling of neutrophils, monocytes, and subsets of lymphocytes on activated endothelium, while its 35-residue cytoplasmic tail directs granule targeting; engagement of PSGL-1 also triggers outside-in signaling through FGR/SYK to extend beta-2 integrins, promotes procoagulant microparticle formation, anchors ultra-large VWF strings to facilitate ADAMTS13 cleavage, activates leukocyte superoxide production and tissue factor expression, and facilitates fibrinolysis and thrombus resolution when blocked post-thrombosis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"P-selectin (SELP/CD62P/GMP-140) is a Ca²⁺-dependent lectin that functions as the primary rapid-response adhesion receptor linking platelet and endothelial cell activation to leukocyte recruitment in inflammation and thrombosis. Stored in platelet alpha-granule and dense-granule membranes and in endothelial Weibel-Palade bodies, P-selectin is translocated to the plasma membrane within minutes upon stimulation by thrombin, histamine, complement C5b-9, or oxidants, with sorting to the regulated secretory pathway directed by its cytoplasmic tail [PMID:2411738, PMID:2472431, PMID:1378326, PMID:2470750]. Its lectin domain binds sialyl Lewis x-containing glycoconjugates—principally PSGL-1—on neutrophils, monocytes, lymphocyte subsets, and CD34⁺ hematopoietic progenitors through a binding pocket requiring Lys113, Tyr48, and Tyr94, and cooperates with PAF to convert initial tethering into CD11/CD18-dependent firm adhesion while directly stimulating leukocyte oxidative burst and monocyte tissue factor expression [PMID:1717488, PMID:7681324, PMID:1717478, PMID:38385292]. A circulating soluble form lacking the transmembrane domain retains ligand-binding capacity and selectively inhibits CD18-dependent neutrophil adhesion, providing an anti-inflammatory counterbalance, while upstream surface expression is regulated by P2Y1/P2Y12 co-signaling through PLC/Ca²⁺ and PI3K/Akt pathways and at the transcriptional level by miR-26b and miR-140 in megakaryocytes [PMID:1372646, PMID:1696029, PMID:33255391, PMID:27975100].\",\n  \"teleology\": [\n    {\n      \"year\": 1985,\n      \"claim\": \"The first question was where P-selectin resides in resting platelets and how it reaches the surface; immunogold EM showed it is stored in alpha-granule membranes and redistributes to the plasma membrane upon thrombin activation, establishing the activation-dependent surface expression paradigm.\",\n      \"evidence\": \"Immunogold labeling on frozen thin sections and surface replicas of resting vs. thrombin-stimulated human platelets\",\n      \"pmids\": [\"2411738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of granule sorting unknown\", \"Endothelial cell expression not yet examined\", \"Ligand identity unknown\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Extending beyond platelets, the question was whether endothelial cells also express and store P-selectin; multiple groups demonstrated P-selectin localization to Weibel-Palade bodies with rapid translocation upon histamine, thrombin, PMA, or complement C5b-9 stimulation, establishing it as a dual-lineage rapid-response molecule and showing that surface expression is followed by endocytic retrieval.\",\n      \"evidence\": \"Immunogold double-label EM co-staining with vWF, biosynthetic labeling, flow cytometry, kinetic stimulation with multiple agonists, and C5b-9/Ca²⁺ influx experiments in endothelial cells\",\n      \"pmids\": [\"2472431\", \"2467701\", \"2470733\", \"2470750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for granule sorting unresolved\", \"Endocytic retrieval machinery not identified\", \"Ligand on leukocytes unknown\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"The functional question of whether P-selectin directly mediates cell-cell adhesion was answered: activated platelets adhered to neutrophils and monocytes in a Ca²⁺-dependent, anti-P-selectin-blockable manner, establishing P-selectin as an adhesion receptor rather than merely a granule marker.\",\n      \"evidence\": \"Platelet-leukocyte adhesion assay with antibody blocking, PADGEM-containing phospholipid vesicle binding, cell-type specificity analysis\",\n      \"pmids\": [\"2478294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of leukocyte counter-receptor unknown\", \"In vivo relevance not demonstrated\", \"Rolling vs. firm adhesion distinction not made\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Sufficiency and ligand identity questions were resolved: transfection of P-selectin cDNA into COS cells recapitulated neutrophil binding, and the carbohydrate Lewis x/CD15 was identified as a key recognition determinant, shifting the field toward glycan-based selectin biology.\",\n      \"evidence\": \"COS cell transfection reconstitution, antibody panel screening against leukocyte antigens, purified CD15 oligosaccharide inhibition\",\n      \"pmids\": [\"1689464\", \"1699666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sialylation requirement not yet defined\", \"Protein scaffold presenting the glycan unknown\", \"E-selectin vs. P-selectin specificity overlap not resolved\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"The precise carbohydrate ligand was refined to sialyl Lewis x (NeuAc α2-3Gal β1-4[Fuc α1-3]GlcNAc), with sialic acid shown to be absolutely required; simultaneously, a specific ~250 kDa sialylated glycoprotein ligand was identified on neutrophils (later named PSGL-1), and sulfatides were found as an alternative lipid ligand sharing the same binding pocket.\",\n      \"evidence\": \"Binding assays with defined glycan-expressing cells, neuraminidase treatment, CHO cells transfected with fucosyltransferase, affinity purification of the ~250 kDa ligand, sulfatide binding and cross-inhibition assays\",\n      \"pmids\": [\"1717488\", \"1704009\", \"1378449\", \"1717159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PSGL-1 not yet cloned or sequenced\", \"Post-translational modifications required for PSGL-1 function unknown\", \"Structural basis for sLex recognition not determined\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"The cooperative adhesion mechanism was elucidated: P-selectin tethers leukocytes while PAF co-presented on the endothelial surface activates CD11/CD18-dependent firm adhesion, defining the two-step juxtacrine model of leukocyte recruitment; separately, oxidants were shown to induce sustained P-selectin expression, expanding the stimulus repertoire beyond classical secretagogues.\",\n      \"evidence\": \"Endothelial stimulation with histamine/thrombin, antibody blocking of P-selectin and CD11/CD18, oxidant treatment with cycloheximide controls\",\n      \"pmids\": [\"1717478\", \"1704376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling pathway from P-selectin engagement to integrin activation in leukocytes not defined\", \"Shear-dependent behavior not addressed\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"P-selectin was found to modulate leukocyte effector functions: contact with P-selectin inhibited TNF-α-induced neutrophil superoxide release and altered neutrophil spreading, establishing P-selectin as a signaling molecule in addition to an adhesion receptor.\",\n      \"evidence\": \"Superoxide anion generation assay on P-selectin-coated surfaces, Fab antibody inhibition, reversibility by washing\",\n      \"pmids\": [\"1706523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling pathway in neutrophils downstream of P-selectin ligation unknown\", \"Whether inhibition vs. activation depends on context not resolved\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"The sorting mechanism was defined: the cytoplasmic tail of P-selectin is necessary and sufficient for targeting to the regulated secretory pathway, as demonstrated by tail-deletion and chimeric constructs, resolving how P-selectin reaches intracellular granules.\",\n      \"evidence\": \"Truncation and chimeric (tissue factor–P-selectin tail) constructs in COS-7, CHO-K1, and AtT20 neuroendocrine cells with immunogold EM and 8-Br-cAMP stimulation\",\n      \"pmids\": [\"1378326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cytoplasmic tail interaction partners mediating sorting not identified\", \"Whether the same mechanism operates in megakaryocytes and endothelial cells not confirmed\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"A circulating soluble form of P-selectin was discovered in plasma, shown to be monomeric and capable of binding the neutrophil receptor; soluble P-selectin selectively blocked CD18-dependent adhesion of activated neutrophils to resting endothelium, suggesting an anti-inflammatory function for the shed/alternatively spliced form.\",\n      \"evidence\": \"ELISA, ultracentrifugation-purified plasma P-selectin, gel filtration, neutrophil binding competition, adhesion inhibition assays\",\n      \"pmids\": [\"1372646\", \"1696029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of proteolytic shedding vs. alternative splicing to soluble P-selectin pool unknown\", \"In vivo anti-inflammatory significance not tested\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Structure-function analysis of the lectin domain identified the critical binding residues: Lys113, Tyr48, and Tyr94 in a shallow groove are essential for both myeloid cell and sulfatide binding, demonstrating a shared binding pocket and providing the first molecular map of the selectin carbohydrate-recognition site.\",\n      \"evidence\": \"Homology modeling from rat mannose-binding protein crystal structure, site-directed alanine mutagenesis, HL60 cell and sulfatide binding assays\",\n      \"pmids\": [\"7681324\", \"7508745\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of P-selectin lectin domain available at this point\", \"Whether these residues contact sLex directly or maintain fold not distinguished\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Transcriptional regulation of SELP was linked to microRNAs: miR-26b and miR-140 directly regulate SELP mRNA levels in megakaryocytes, and hyperglycemia reduces these miRNAs while increasing SELP, connecting metabolic disease to P-selectin upregulation.\",\n      \"evidence\": \"miRNA mimic/anti-miR manipulation in MEG-01 megakaryocytic cells, RT-qPCR and flow cytometry\",\n      \"pmids\": [\"27975100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct miRNA–3′UTR binding not validated by luciferase reporter assay in this study\", \"In vivo relevance in diabetic patients not established\", \"Other transcriptional or post-transcriptional regulators not surveyed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The upstream signaling cascade for ADP-induced P-selectin surface expression was dissected: P2Y12 drives PI3K/Akt1 phosphorylation while P2Y1 generates the cytosolic Ca²⁺ environment required for PI3K activity, with both receptors required for full degranulation.\",\n      \"evidence\": \"Selective P2Y1 (MRS2500) and P2Y12 (PSB0739) antagonists, PLC/IP3R/calmodulin/PI3K inhibitors, flow cytometry for CD62P, Akt1 phosphorylation western blot in human platelets\",\n      \"pmids\": [\"33255391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this pathway is the dominant one for all agonists (thrombin, collagen) not tested\", \"Role of other PI3K isoforms not defined\", \"Connection to granule fusion machinery not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The in vivo functional consequence of P-selectin at the thrombus site was demonstrated: P-selectin directly enhances neutrophil ROS production and monocyte tissue factor expression, and post-thrombus blockade reduces leukocyte infiltration and accelerates venous thrombus resolution via increased uPA, integrating P-selectin's adhesive and signaling roles into thromboinflammation.\",\n      \"evidence\": \"IVC stenosis mouse model, P-selectin blocking antibody post-thrombus, intravital microscopy, flow cytometry, P-selectin-coated bead ROS/tissue factor assays, SEM, uPA measurement\",\n      \"pmids\": [\"38385292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which P-selectin blockade increases uPA not defined\", \"Whether soluble vs. membrane P-selectin contributes differentially in vivo not resolved\", \"Therapeutic window and translational applicability not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for PSGL-1 recognition at atomic resolution in the context of shear flow, the precise molecular machinery coupling cytoplasmic tail signals to granule sorting in megakaryocytes and endothelial cells, and whether soluble P-selectin generated by shedding vs. alternative splicing has distinct physiological roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution co-crystal structure of P-selectin with intact PSGL-1\", \"Adaptor proteins linking the cytoplasmic tail to sorting machinery not identified\", \"Relative in vivo contributions of shed vs. alternatively spliced soluble P-selectin unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [2, 8, 9, 11, 14, 15, 16]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [17, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 4, 8, 20]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 1, 3, 19, 20]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 8, 11, 14, 27, 29]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [0, 19, 29, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 31]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [2, 8, 11, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SELPLG\", \"SELL\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"P-selectin (SELP/CD62P/GMP-140) is a Ca²⁺-dependent lectin that functions as the principal rapid-response adhesion receptor on activated platelets and endothelial cells, mediating the initial tethering and rolling of neutrophils, monocytes, and lymphocyte subsets on the vascular wall during inflammation and hemostasis. Stored in platelet α-granules and endothelial Weibel-Palade bodies alongside von Willebrand factor, SELP is mobilized to the plasma membrane within minutes by thrombin, histamine, oxidants, or complement C5b-9; its 35-residue cytoplasmic tail is necessary and sufficient for granule targeting, and an alternatively spliced soluble form circulates in plasma [PMID:2411738, PMID:2472431, PMID:1378326, PMID:1372646]. The N-terminal lectin domain recognizes sialyl-Lewis x on glycoprotein ligands—principally PSGL-1 (which also requires tyrosine sulfation for high-affinity binding), but also CD24, GP Ibα, CD44, sulfatides, and the chondroitin sulfate chains of versican—through a shallow binding groove defined by critical residues Lys113, Tyr48, and Tyr94 [PMID:7505206, PMID:11081633, PMID:7681324, PMID:9129046, PMID:10499919, PMID:10950950]. Beyond adhesion, engagement of PSGL-1 triggers outside-in signaling through FGR/SYK to extend β₂ integrins on rolling leukocytes, induces procoagulant tissue-factor-bearing microparticle release, anchors ultra-large VWF strings to endothelium, promotes neutrophil superoxide production, and—when blocked after thrombus formation—facilitates fibrinolysis and thrombus resolution [PMID:20445017, PMID:12858167, PMID:14630802, PMID:7690799, PMID:38385292].\",\n  \"teleology\": [\n    {\n      \"year\": 1985,\n      \"claim\": \"The discovery that GMP-140 redistributes from platelet α-granule membranes to the cell surface upon thrombin activation established it as an activation-dependent surface marker and suggested a role in post-activation cell-cell interactions.\",\n      \"evidence\": \"Immunogold labeling of resting versus thrombin-stimulated human platelets\",\n      \"pmids\": [\"2411738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No function for the surface-expressed protein was known\", \"Endothelial expression had not been examined\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Cloning of the SELP cDNA and parallel localization studies revealed a modular lectin-type adhesion molecule stored in both platelet α-granules and endothelial Weibel-Palade bodies, with alternative splicing generating a soluble isoform, and showed that it specifically mediates Ca²⁺-dependent adhesion of activated platelets to neutrophils and monocytes.\",\n      \"evidence\": \"cDNA sequencing, immunogold double-labeling with vWF in endothelial cells, platelet-leukocyte rosetting assays with antibody blocking and Ca²⁺ chelation, biosynthetic labeling\",\n      \"pmids\": [\"2466574\", \"2472431\", \"2478294\", \"2467701\", \"2470733\", \"2463989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise carbohydrate ligand not yet defined\", \"Counter-receptor identity unknown\", \"Mechanism of granule targeting not resolved\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Gain-of-function transfection of GMP-140 into COS cells demonstrated that SELP alone is sufficient to mediate Ca²⁺-dependent neutrophil adhesion, and genomic analysis revealed a 17-exon gene with each exon encoding a distinct structural domain.\",\n      \"evidence\": \"COS cell transfection adhesion assay with purified protein controls; genomic cloning and PCR-confirmed splice variants\",\n      \"pmids\": [\"1689464\", \"1701178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific carbohydrate determinant recognized by the lectin domain still debated (Lex vs. sLex)\", \"In vivo rolling function not yet demonstrated\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Identification of sialyl-Lewis x as the core carbohydrate recognition motif, together with the demonstration that SELP-mediated tethering operates independently of CD18 integrins but cooperates with PAF signaling for firm adhesion, defined the two-step adhesion cascade paradigm; additional stimuli (oxidants, complement C5b-9) were shown to mobilize SELP to the endothelial surface.\",\n      \"evidence\": \"Carbohydrate competition and glycosyltransferase-transfection binding assays; antibody blocking of GMP-140 and CD11/CD18 on histamine/thrombin-stimulated endothelium; oxidant and complement stimulation with Ca²⁺/kinase inhibitors; radioligand binding with neuraminidase\",\n      \"pmids\": [\"1712483\", \"1717488\", \"1717478\", \"1704376\", \"2470750\", \"1704009\", \"1699666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the high-molecular-weight glycoprotein counter-receptor not yet cloned\", \"Signaling events downstream of leukocyte engagement unclear\", \"Role of sulfatide binding in vivo unknown\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Biochemical identification of a ~120 kDa glycoprotein counter-receptor on neutrophils, demonstration that the last 23 amino acids of the SELP cytoplasmic tail are necessary and sufficient for regulated granule sorting, and detection of a circulating soluble monomeric form in plasma resolved key questions about ligand identity, trafficking, and physiology.\",\n      \"evidence\": \"Affinity chromatography with ¹²⁵I-P-selectin and systematic immunodepletion; domain-swap chimeras in AtT20 cells with immunogold EM; ELISA and gel filtration of plasma SELP\",\n      \"pmids\": [\"1378449\", \"1378326\", \"1372646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Counter-receptor cDNA not cloned\", \"Structural basis of lectin-domain–ligand interaction unknown\", \"Role of lymphocyte binding not defined in vivo\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Expression cloning of PSGL-1 as the principal glycoprotein ligand for P-selectin, together with site-directed mutagenesis mapping the lectin-domain binding groove to residues Lys113, Tyr48, and Tyr94, established both sides of the P-selectin–ligand interface and showed that PSGL-1 requires fucosylation for function.\",\n      \"evidence\": \"HL-60 cDNA expression cloning with COS-cell reconstitution; homology-modeled mutagenesis panel with myeloid cell binding assays\",\n      \"pmids\": [\"7505206\", \"7681324\", \"7690799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of the P-selectin–PSGL-1 complex not yet solved\", \"Contribution of tyrosine sulfation to PSGL-1 binding unknown\", \"Distinction between multiple P-selectin ligands in vivo not resolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of CD24 as an additional P-selectin ligand on neutrophils and tumor cells expanded the ligand repertoire beyond PSGL-1 and implicated P-selectin in cancer-associated platelet adhesion.\",\n      \"evidence\": \"CD24 purification, bead-based P-selectin-IgG binding, CD24 transfection into tumor cells with platelet adhesion readout\",\n      \"pmids\": [\"9129046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of CD24 versus PSGL-1 in vivo not determined\", \"Structural basis of CD24–P-selectin interaction unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"GP Ibα was identified as a Ca²⁺-independent P-selectin counter-receptor whose recognition requires tyrosine sulfation but not sLex, distinguishing its binding mode from that of PSGL-1 and demonstrating ligand diversity.\",\n      \"evidence\": \"P-selectin-transfected cell adhesion to immobilized GP Ibα, rolling on histamine-stimulated endothelium, antibody blocking\",\n      \"pmids\": [\"10499919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of GP Ibα–P-selectin contact not defined\", \"Functional role in platelet–platelet or platelet–VWF interactions uncertain\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Crystal structures of the P-selectin lectin-EGF fragment co-complexed with sLex and with the sulfated N-terminus of PSGL-1 provided atomic-resolution understanding of how dual recognition of sLex and sulfated tyrosine yields high-affinity binding, and versican's chondroitin sulfate chains were identified as extracellular matrix ligands.\",\n      \"evidence\": \"X-ray crystallography of P-selectin LE domain with ligands; solid-phase binding of soluble P-selectin to versican and GAG competition\",\n      \"pmids\": [\"11081633\", \"10950950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length P-selectin structure with all consensus repeats not determined\", \"Role of versican binding in leukocyte recruitment in vivo untested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"P-selectin was shown to anchor ultra-large VWF strings to endothelial surfaces and to generate procoagulant tissue-factor-bearing microparticles through PSGL-1 engagement, linking SELP directly to coagulation and thrombus propagation.\",\n      \"evidence\": \"Co-immunoprecipitation from histamine-activated endothelium, AFM bond-strength measurement, Psgl1⁻/⁻ mouse microparticle studies, hemophilia A mouse rescue by microparticle infusion\",\n      \"pmids\": [\"14630802\", \"12858167\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which P-selectin–VWF interaction facilitates ADAMTS13 cleavage not fully resolved\", \"Source of tissue factor on microparticles not definitively assigned\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Dissection of the signaling cascade downstream of PSGL-1 engagement on rolling neutrophils revealed that P-selectin triggers FGR/SYK-dependent extension of LFA-1, establishing the molecular link between selectin-mediated rolling and integrin activation.\",\n      \"evidence\": \"Microfluidic rolling assays with conformational reporter antibodies for LFA-1, kinase inhibitors, PSGL-1 blocking\",\n      \"pmids\": [\"20445017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full signaling cascade from PSGL-1 to FGR/SYK activation not mapped\", \"Whether the same pathway operates for monocytes and lymphocytes untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Post-thrombotic P-selectin blockade was shown to reduce leukocyte infiltration, neutrophil ROS production, monocyte tissue factor expression, and thrombus density while promoting urokinase-mediated fibrinolysis, demonstrating that P-selectin actively sustains thrombus burden after formation.\",\n      \"evidence\": \"Mouse IVC stenosis model with anti-P-selectin antibody, intravital microscopy, flow cytometry, scanning EM, uPA measurement\",\n      \"pmids\": [\"38385292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Translatability to human venous thromboembolism not established\", \"Whether soluble P-selectin contributes to thrombus maintenance in this model unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full-length structure of P-selectin with all nine complement repeats, the relative in vivo contributions of non-PSGL-1 ligands (CD24, GP Ibα, CD44, versican) to different inflammatory and thrombotic contexts, the complete outside-in signaling network triggered by PSGL-1 engagement, and the therapeutic window for P-selectin blockade in human thromboinflammatory disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length crystal or cryo-EM structure\", \"Relative ligand contributions in different disease models remain genetically unresolved\", \"Clinical translation data not captured in the mechanistic timeline\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [3, 8, 10, 12, 16, 39, 40]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [28, 36, 39]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 2, 4, 5, 22]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 8, 38]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 28, 39, 40, 42]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [36, 42]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [3, 8, 16, 40]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2, 5, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SELPLG\",\n      \"VWF\",\n      \"CD24\",\n      \"GP1BA\",\n      \"VCAN\",\n      \"FGR\",\n      \"SYK\",\n      \"TLR4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}