{"gene":"SELE","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1989,"finding":"ELAM-1 (SELE/E-selectin) was cloned by transient expression in COS cells from a subtracted cDNA library of cytokine-treated endothelial cells. The predicted protein structure contains an amino-terminal lectin-like domain, an EGF domain, and six tandem complement regulatory repeat motifs. Expression is cytokine-inducible, reaching maximum at 2–4 hours and decaying by 24 hours, and transfected cells support adhesion of neutrophils and HL-60 cells in a Ca2+-dependent but temperature-independent manner.","method":"cDNA cloning by transient expression/functional adhesion selection, structural domain analysis, transfection adhesion assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — original cloning and functional characterization with multiple orthogonal methods; foundational paper with >2000 citations","pmids":["2466335"],"is_preprint":false},{"year":1990,"finding":"ELAM-1 (E-selectin) mediates cell adhesion by recognizing the carbohydrate ligand sialyl-Lewis X (NeuAc α2,3Gal β1,4[Fuc α1,3]GlcNAc), a terminal structure on neutrophil glycoproteins and glycolipids, establishing the lectin function of its N-terminal carbohydrate recognition domain.","method":"Cell adhesion inhibition assay with purified carbohydrate structures and monoclonal antibodies; COS-cell transfection adhesion assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — direct ligand identification replicated in two independent simultaneous studies (PMIDs 1701274 and 1701275) with >1000 citations each","pmids":["1701274","1701275"],"is_preprint":false},{"year":1990,"finding":"Transfection of an α(1,3)-fucosyltransferase cDNA into non-myeloid cells confers ELAM-1-dependent endothelial adhesion, with binding activity correlating with de novo cell-surface expression of sialyl-Lewis X. This demonstrated that specific fucosyltransferases regulate ELAM-1 ligand biosynthesis.","method":"Fucosyltransferase cDNA transfection, flow cytometry for sLex expression, ELAM-1-dependent adhesion assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — functional reconstitution by transfection with direct biochemical correlation; >650 citations","pmids":["1699667"],"is_preprint":false},{"year":1990,"finding":"ELFT, a cloned α(1,3)-fucosyltransferase specifically expressed in cell types that bind ELAM-1, confers ELAM-1 binding activity when transfected into non-binding cell lines, indicating that a fucosylated carbohydrate structure is an essential component of the ELAM-1 ligand.","method":"cDNA cloning, transfection-based adhesion assay, enzymatic activity assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of ELAM-1 binding by fucosyltransferase expression; >325 citations","pmids":["1702034"],"is_preprint":false},{"year":1990,"finding":"ELAM-1 gene transcription is activated by TNF, IL-1, and LPS via PKC-independent activation of NF-κB-like DNA binding activity in endothelial cells, as demonstrated by nuclear run-on experiments and gel mobility shift assays. PKC blockade inhibits ELAM-1 transcription despite intact NF-κB activation, indicating NF-κB is necessary but not sufficient.","method":"Nuclear run-on transcription assay, gel mobility shift assay, PKC inhibitor studies, promoter sequence analysis","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods defining transcriptional mechanism; replicated by independent study (PMID 1710341)","pmids":["1713680","1710341"],"is_preprint":false},{"year":1991,"finding":"The ELAM-1 promoter contains an NF-κB consensus binding site (−94 to −85) that is necessary but not sufficient for cytokine-induced transcription; a second cis-acting element between −233 and −117 is also required, demonstrating that cytokine induction of ELAM-1 involves combinatorial transcription factor action.","method":"Reporter gene deletion mutant constructs, gel shift assay, transient transfection in endothelial and non-endothelial cells","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1 — promoter dissection with multiple deletion constructs and orthogonal gel-shift assays","pmids":["1710341"],"is_preprint":false},{"year":1991,"finding":"Both sialyl-Lewis A (NeuAc α2-3Gal β1-3[Fuc α1-4]GlcNAc) and sialyl-Lewis X are potent ligands for ELAM-1, recognizing a common carbohydrate domain involving neuraminic acid and fucose. Molecular modeling (HSEA calculations) shows both hexasaccharides adopt similar three-dimensional conformations.","method":"Cell binding assay with immobilized synthetic glycoconjugates, ELAM-1 cDNA transfectants, HSEA molecular modeling","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct binding assay with synthetic carbohydrates and structural modeling; >436 citations","pmids":["1714447"],"is_preprint":false},{"year":1991,"finding":"The ELAM-1 gene spans ~13 kb, contains 14 exons, is present as a single copy on human chromosome 1q12→qter, and has exon-intron boundaries that correlate with functional protein domain subdivisions (lectin domain, EGF domain, six complement regulatory repeats each encoded by distinct exons). The promoter contains NF-κB and AP-1 consensus sites.","method":"Genomic cloning, restriction mapping, sequencing, exon-intron boundary determination, human-mouse somatic hybrid cell panel for chromosomal mapping","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — complete gene structure determination with chromosomal localization; >176 citations","pmids":["1703529"],"is_preprint":false},{"year":1991,"finding":"Neutrophil LECAM-1 (L-selectin) bears sialyl-Lewis X modifications and can present this oligosaccharide ligand to ELAM-1 on endothelial cells. LECAM-1 is concentrated on PMN surface microvilli (initial contact sites), and anti-LECAM-1 antibodies or selective LECAM-1 removal inhibit PMN binding to ELAM-1 transfectants by up to 70%, identifying a receptor-counterreceptor interaction between the two selectins.","method":"Anti-LECAM-1 antibody blocking, selective LECAM-1 removal, adhesion assays with ELAM-1 transfected cells, flow cytometry, immunoelectron microscopy","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple blocking and depletion approaches in same study; >566 citations","pmids":["1716182"],"is_preprint":false},{"year":1991,"finding":"The sialyl-Lewis X ligand for ELAM-1 on HL-60 cells is not carried by N-linked oligosaccharides (complex-type N-glycans), since inhibitors of N-linked glycoprotein processing (N-methyl-deoxynojirimycin, 1-deoxymannojirimycin, swainsonine) do not affect ELAM-1-dependent adhesion, suggesting the ligand is a glycolipid or O-linked glycoprotein.","method":"Glycosylation processing inhibitors (N-methyl-deoxynojirimycin, deoxymannojirimycin, swainsonine), cell adhesion assay with HUVEC","journal":"European Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological approach with clear negative results; single lab, single method type","pmids":["1721027"],"is_preprint":false},{"year":1991,"finding":"IFN-γ enhances and prolongs ELAM-1 expression on TNF/IL-1/LPS-activated endothelial cells, abrogates the refractory period for ELAM-1 restimulation, and potentiates IL-6 production, defining a regulatory role for IFN-γ in modulating ELAM-1-dependent inflammatory adhesion.","method":"Flow cytometry for cell-surface ELAM-1, cytokine co-stimulation experiments in HUVEC, cytokine pre-treatment timing studies","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple timing conditions tested; single lab","pmids":["1697876"],"is_preprint":false},{"year":1991,"finding":"ELAM-1 exclusively mediates adhesion of memory (CD45RO+) but not naive CD4+ T cells, and this adhesion is independent of acute T-cell activation signals that regulate integrin-mediated adhesion, demonstrating a distinct, activation-independent adhesion pathway for memory T-cell subset trafficking.","method":"Adhesion assay to purified ELAM-1, antibody blocking, T-cell subset characterization by flow cytometry","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — replicated by two independent Nature publications (PMIDs 1705666 and 1705667) and confirmed in JCB (PMID 1710227); mechanistically defined activation-independent property","pmids":["1705667","1705666","1710227"],"is_preprint":false},{"year":1991,"finding":"ELAM-1 mediates adhesion of a skin-homing subset of circulating memory T cells defined by cutaneous lymphocyte-associated antigen (CLA), as shown by ELAM-1-transfected COS cell adhesion assays. Vascular ELAM-1 expression is preferentially found in cutaneous over non-cutaneous inflammatory sites, supporting its role as a skin vascular addressin.","method":"ELAM-1-transfected COS cell adhesion assay, T-cell subset flow cytometry, immunohistology of tissue specimens","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — direct functional adhesion assay combined with in vivo immunohistology; >829 citations","pmids":["1705666"],"is_preprint":false},{"year":1991,"finding":"Labile (short-lived) proteins play a dual role in ELAM-1 gene regulation: they destabilize ELAM-1 mRNA and suppress NF-κB binding activity in resting cells. Protein synthesis inhibitors (cycloheximide, anisomycin, emetine) superinduce ELAM-1 mRNA by stabilizing the transcript and potentiating NF-κB binding, with the NF-κB binding site in the promoter being necessary and sufficient for superinduction.","method":"Protein synthesis inhibitors, mRNA half-life measurements, nuclear run-on transcription assay, NF-κB gel shift assay, promoter deletion reporter assays","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple complementary mechanistic approaches (transcription, mRNA stability, promoter deletion, EMSA); single lab with rigorous controls","pmids":["1382069"],"is_preprint":false},{"year":1991,"finding":"ELAM-1 binds monocytes through a counter-structure on monocytes; at reduced metabolic activity (4°C or fixed monocytes), anti-ELAM-1 F(ab')2 strongly blocks monocyte adhesion to activated HUVEC following kinetics that parallel ELAM-1 surface expression, and is confirmed using ELAM-1-transfected COS cells.","method":"Antibody blocking adhesion assay at 37°C and 4°C, fixed-cell adhesion, COS-cell transfection adhesion assay","journal":"Scandinavian Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple conditions and transfected-cell confirmation; single lab","pmids":["1371364"],"is_preprint":false},{"year":1992,"finding":"Labile proteins play a dual role in controlling ELAM-1 gene expression through both mRNA stability and transcriptional mechanisms; treatment with protein synthesis inhibitors superinduces ELAM-1 via NF-κB-dependent promoter activation and mRNA stabilization.","method":"Nuclear run-on assay, mRNA half-life determination, gel shift assay","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — mechanistic dissection at transcriptional and post-transcriptional levels with multiple methods","pmids":["1382069"],"is_preprint":false},{"year":1993,"finding":"Sialyl-Lewis A (SLea) on pancreatic carcinoma cells mediates adhesion to E-selectin on cytokine-activated endothelial cells; anti-E-selectin and anti-SLea antibodies block augmented attachment at both 4°C and 25°C, while anti-SLex does not, revealing SLea as the dominant ELAM-1 ligand on these tumor cells.","method":"Adhesion assay to IL-1β/TNF-α-activated HUVEC, antibody blocking (anti-E-selectin, anti-SLea, anti-SLex), flow cytometry for E-selectin expression","journal":"International Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 — multiple antibody blocking conditions; single lab","pmids":["7687590"],"is_preprint":false},{"year":1994,"finding":"The crystal structure of the lectin/EGF domain region of human E-selectin was determined at 2.0 Å resolution, revealing limited interdomain contact, Ca2+ coordination distinct from other C-type lectins, and a specific region/amino acid side chains involved in ligand binding as confirmed by mutagenesis.","method":"X-ray crystallography at 2.0 Å, site-directed mutagenesis, functional binding assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — atomic-resolution structure combined with mutagenesis functional validation; >345 citations","pmids":["7509040"],"is_preprint":false},{"year":1993,"finding":"After surface expression, internalized E-selectin is routed exclusively to endosomes and lysosomes for degradation, in contrast to P-selectin which recycles to Weibel-Palade body storage granules. Deletion of the cytoplasmic domain abolishes internalization of both selectins, demonstrating cytoplasmic-tail-dependent intracellular trafficking.","method":"Immunofluorescent antibody tracking, subcellular fractionation, Western blot, AtT-20 cell transfection with cytoplasmic domain deletion mutants","journal":"Molecular Biology of the Cell","confidence":"High","confidence_rationale":"Tier 1 — direct intracellular antibody routing, subcellular fractionation, and cytoplasmic domain deletion mutants; >150 citations","pmids":["7694691"],"is_preprint":false},{"year":1996,"finding":"Leukocyte adhesion to cytokine-activated endothelium induces transmembrane linkage of E-selectin to the actin cytoskeleton through its cytoplasmic domain. E-selectin clusters at leukocyte attachment sites, co-purifies with α-actinin, vinculin, filamin, paxillin, and focal adhesion kinase (FAK) but not talin. A tailless (cytoplasmic domain-deleted) E-selectin mutant supports leukocyte attachment but fails to associate with the cytoskeleton or resist mechanical stress.","method":"Confocal microscopy, detergent-based cytoskeletal fractionation, Western blot, paramagnetic bead pull-down, magnetic twisting cytometer, COS-7 cell transfection with tailless mutant","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods (confocal, fractionation, mechanical stress, domain mutant); >162 citations","pmids":["8609175"],"is_preprint":false},{"year":1996,"finding":"PSGL-1 requires core 2 O-linked glycans (sialylated and fucosylated) to bind E-selectin, but unlike P-selectin binding, E-selectin binding by PSGL-1 does not require tyrosine sulfation, as phenylalanine replacement of three consensus tyrosines abolished P-selectin binding but not E-selectin binding.","method":"CHO cell co-transfection with PSGL-1, C2GnT, and α1,3-fucosyltransferases; tyrosine-to-phenylalanine mutagenesis; binding assays to selectin-expressing cells","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in CHO cells with defined glycosyltransferases plus site-directed mutagenesis; >264 citations","pmids":["8621728"],"is_preprint":false},{"year":2001,"finding":"CD44, modified with sialylated, fucosylated N-glycans (not O-glycans), functions as an E-selectin ligand on human hematopoietic progenitor cells (HPCs), mediating rolling on E-selectin-expressing bone marrow endothelial cells under physiological flow conditions over a wider shear range than PSGL-1.","method":"Shear-based adherence assay, immunopurification of membrane proteins, flow cytometry, neutralizing antibodies, selectin-Ig fusion protein binding assays","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 — physiological flow-based functional assay with antibody confirmation; >246 citations","pmids":["11402070"],"is_preprint":false},{"year":2001,"finding":"Outside-to-inside (reverse) signaling through membrane TNF-α induces E-selectin (CD62E) expression on activated CD4+ T cells and HTLV-I-infected T cell lines (not just endothelial cells), via transcriptional upregulation. Wild-type and cleavage-resistant membrane TNF-α mutant both support CD62E induction by anti-TNF-α antibody, confirming the reverse-signaling mechanism.","method":"Anti-TNF-α antibody stimulation of membrane TNF-α-expressing cells, Northern blot, RT-PCR, transfection with WT and mutant membrane TNF-α in Jurkat and HeLa cells, cell-cell contact assay","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple cell systems and mutant confirmation; single lab","pmids":["11123285"],"is_preprint":false},{"year":2003,"finding":"Preferential accumulation of antigen-specific effector CD4 T cells at an antigen injection site requires CD62E (E-selectin) expression on blood vessels; the most-divided effector CD4 T cells bind CD62P in draining lymph nodes, then enter the injection site via CD62E recognition, and are retained in a nonproliferative state by peptide-MHC II recognition.","method":"Adoptive transfer of antigen-specific CD4 T cells tracked in whole body, CD62E-deficient recipient mice (genetic knockout), antigen injection model","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout experiment with whole-body T-cell tracking; >112 citations","pmids":["12629067"],"is_preprint":false},{"year":2009,"finding":"TNF-induced miRNAs miR-31 and miR-17-3p provide negative feedback control of E-selectin expression by pairing with target sequences in E-selectin mRNA 3' UTR. Specific antagonism of miR-31 increased neutrophil adhesion to endothelial cells, while miR-31 mimic transfection decreased adhesion, establishing a post-transcriptional regulatory loop.","method":"miRNA antagonism and mimic transfection in endothelial cells, neutrophil adhesion assay, 3'-UTR target identification","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 — bidirectional gain/loss-of-function miRNA experiments with functional readout; >281 citations","pmids":["19949084"],"is_preprint":false},{"year":2010,"finding":"Human neutrophil rolling on E-selectin (or P-selectin) induces the extended (KIM127/NKI-L16 epitopes) but not the high-affinity conformation (mAb24 epitope) of LFA-1 (αLβ2), in a PSGL-1-, Src family kinase (FGR)-, and SYK-dependent manner, promoting slow rolling but not firm adhesion. This signaling requires phospholipase C and p38 MAP kinase.","method":"Flow-based rolling assay on immobilized E-selectin and P-selectin, reporter antibody binding assay for integrin conformational epitopes, kinase inhibitors, PSGL-1 blocking antibody","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — mechanistic dissection using multiple kinase inhibitors and conformation-specific antibodies under flow conditions; >138 citations","pmids":["20445017"],"is_preprint":false},{"year":2011,"finding":"PSGL-1, CD44, and ESL-1 are physiologic glycoprotein ligands for E-selectin on mature leukocytes mediating tethering and rolling. PSGL-1 and CD44 induce signals that activate β2 integrin LFA-1 and promote slow rolling, whereas ESL-1 induces signals that activate Mac-1 in adherent neutrophils, assigning specialized adhesive and signaling roles to distinct E-selectin ligands.","method":"Flow-based adhesion assay, genetic knockout mice, integrin activation assays, signaling pathway analysis (literature synthesis with cited mouse experiments)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — comprehensive mechanistic review synthesizing in vivo genetic data from multiple labs; >361 citations","pmids":["22021370"],"is_preprint":false},{"year":2001,"finding":"Dimethylfumarate (DMF) at ≤70 µM specifically inhibits TNF-induced CD62E (E-selectin) but not CD54 (ICAM-1) expression in endothelial cells by inhibiting NF-κB (but not AP-1) promoter activation, as demonstrated using CD62E-, NF-κB-, and AP-1-responsive promoter reporter constructs. A 60-min preincubation is sufficient for 24-h blockade; the hydrolysis product methylhydrogenfumarate is inactive.","method":"Flow cytometry, NF-κB/AP-1/CD62E promoter-reporter transfection assays, in vivo skin biopsy immunohistochemistry in psoriasis patients treated with oral fumaric acid esters","journal":"Journal of Investigative Dermatology","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic promoter reporter assay with in vivo correlation; single lab","pmids":["11886496"],"is_preprint":false},{"year":2010,"finding":"Indoxyl sulfate (a uremic toxin) enhances E-selectin expression on TNF-α-activated HUVEC via JNK- and NF-κB-dependent pathways (not through ICAM-1 or VCAM-1), and in vivo anti-E-selectin antibody treatment reduces indoxyl sulfate-induced leukocyte adhesion to the femoral artery in nephrectomized mice.","method":"Flow cytometry, JNK/NF-κB kinase inhibitors, NAD(P)H oxidase inhibitor, flow-based adhesion assay, anti-E-selectin antibody in CKD mouse model","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro pathway dissection with in vivo antibody validation; single lab; >150 citations","pmids":["20937831"],"is_preprint":false},{"year":2008,"finding":"E-selectin (CD62E) on tumor blood vessels is down-regulated in squamous cell carcinomas (SCCs), resulting in reduced CLA+ T-cell infiltration. TLR7 agonist imiquimod induces E-selectin on tumor vessels and recruits CLA+CD8+ T cells with evidence of tumor regression, demonstrating that tumor immune evasion involves active suppression of vascular E-selectin.","method":"Immunohistochemistry of human SCC biopsies, imiquimod treatment (in vivo and in vitro), flow cytometry, regulatory T-cell functional assays","journal":"Journal of Experimental Medicine","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and in vitro experiments with functional immune outcomes; single lab; >179 citations","pmids":["18794336"],"is_preprint":false},{"year":2015,"finding":"SELE (E-selectin/CD62E) expression in trabecular meshwork cells is co-induced with MYOC mutations (Q368X, Y437H) that activate the IL-1/NF-κB inflammatory stress pathway; wild-type MYOC inhibits NF-κB activity and decreases SELE induction, establishing SELE as a downstream marker of the IL-1/NF-κB pathway in trabecular meshwork glaucoma pathology.","method":"Lentiviral stable transduction with doxycycline-inducible mutant MYOC constructs, RT-PCR, ELISA for IL-1α protein, NF-κB luciferase reporter assay","journal":"Molecular Vision","confidence":"Medium","confidence_rationale":"Tier 2 — inducible expression system with luciferase reporter and protein quantification; single lab","pmids":["26396484"],"is_preprint":false},{"year":2024,"finding":"PDGFRα+ITGA11+ cancer-associated fibroblasts (CAFs) promote lymphangiogenesis by recognizing SELE (E-selectin) on lymphatic endothelial cells via the ITGA11 surface receptor, activating the SRC-p-VEGFR3-MAPK signaling pathway to drive lymphovascular invasion and lymph node metastasis in early-stage bladder cancer.","method":"Single-cell RNA sequencing, spatial transcriptomics, CAF-specific ITGA11-deficient mouse model, multicenter clinical cohort (910 cases), signaling pathway analysis","journal":"Cancer Cell","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo mouse genetic model with pathway mechanistic validation; single lab; >113 citations","pmids":["38428409"],"is_preprint":false},{"year":1997,"finding":"After surface induction, E-selectin protein distributes over the entire apical endothelial cell surface including microvillus-like projections (particularly with TNF-α), as demonstrated by immunogold labeling with TEM and HR-SEM. LPS treatment produces the highest density of E-selectin surface labeling without inducing cytotoxicity or ultrastructural changes.","method":"Immunogold labeling (silver-enhanced colloidal gold), transmission electron microscopy (TEM), high-resolution scanning electron microscopy (HR-SEM), quantitative gold particle counting","journal":"Micron","confidence":"Low","confidence_rationale":"Tier 2 — direct ultrastructural localization; single lab, descriptive with limited functional follow-up","pmids":["7520816"],"is_preprint":false}],"current_model":"SELE (E-selectin/ELAM-1) is a cytokine-inducible endothelial cell-surface glycoprotein whose transcription is activated by NF-κB (and a second upstream cis-element) in response to TNF, IL-1, and LPS; it functions as a C-type lectin that binds sialyl-Lewis X and sialyl-Lewis A carbohydrate ligands (displayed on PSGL-1, CD44, CEA, and glycolipids on leukocytes and tumor cells) through its N-terminal lectin/EGF domain whose structure is known at 2.0 Å; upon leukocyte binding it clusters at contact sites and links via its cytoplasmic domain to an actin-associated complex including α-actinin, vinculin, filamin, paxillin, and FAK, while after endocytosis it is routed to lysosomes for degradation; its expression is post-transcriptionally regulated by TNF-induced miR-31 providing negative feedback, and it mediates skin-homing of CLA+ memory T cells, neutrophil rolling with downstream LFA-1 activation through PSGL-1-SYK-FGR signaling, and on lymphatic endothelial cells engages ITGA11 on CAFs to activate SRC-p-VEGFR3-MAPK-driven lymphangiogenesis."},"narrative":{"teleology":[{"year":1989,"claim":"The molecular identity of the cytokine-inducible endothelial leukocyte adhesion molecule was unknown; cloning of ELAM-1 revealed a mosaic protein with an N-terminal lectin domain, an EGF domain, and six complement regulatory repeats, and demonstrated that it directly mediates neutrophil adhesion.","evidence":"cDNA cloning by functional expression selection in COS cells with adhesion assay validation","pmids":["2466335"],"confidence":"High","gaps":["Carbohydrate ligand identity unknown","Transcriptional regulation mechanism undefined","In vivo role not tested"]},{"year":1990,"claim":"The nature of the E-selectin ligand was resolved as the tetrasaccharide sialyl-Lewis X (and subsequently sialyl-Lewis A), with α(1,3)-fucosyltransferase expression being necessary and sufficient to generate the ligand on non-myeloid cells, establishing E-selectin as a carbohydrate-binding lectin.","evidence":"Purified carbohydrate inhibition assays, fucosyltransferase cDNA transfection conferring binding in non-binding cells","pmids":["1701274","1701275","1699667","1702034"],"confidence":"High","gaps":["Specific glycoprotein carriers on leukocytes not identified","Three-dimensional structure of the lectin domain not determined","Relative contribution of glycolipid vs glycoprotein ligands unclear"]},{"year":1990,"claim":"The transcriptional mechanism driving cytokine-inducible ELAM-1 expression was shown to require NF-κB activation in a PKC-independent manner, with a second upstream cis-element also necessary, and labile repressor proteins controlling both mRNA stability and NF-κB activity in resting cells.","evidence":"Nuclear run-on assays, gel mobility shift assays, PKC inhibitor studies, promoter deletion reporters, protein synthesis inhibitor superinduction experiments","pmids":["1713680","1710341","1382069"],"confidence":"High","gaps":["Identity of the second cis-element transcription factor not determined","Nature of the labile repressor protein not identified","Post-transcriptional regulation by non-coding RNA not yet explored"]},{"year":1991,"claim":"E-selectin was found to selectively bind memory (CD45RO⁺) but not naive T cells, and specifically the CLA⁺ skin-homing subset, with preferential vascular expression at cutaneous inflammatory sites — establishing E-selectin as a tissue-selective vascular addressin for skin immune surveillance.","evidence":"Adhesion assays with purified T-cell subsets, ELAM-1-transfected COS cells, immunohistology of cutaneous vs non-cutaneous tissues","pmids":["1705666","1705667","1710227"],"confidence":"High","gaps":["Molecular basis for CLA⁺ T-cell selectivity not defined","In vivo requirement not tested in genetic models","Ligand identity on memory T cells not determined"]},{"year":1993,"claim":"The intracellular fate of E-selectin after surface expression was defined: internalized E-selectin routes exclusively to endosomes and lysosomes for degradation (not recycled), and cytoplasmic domain deletion abolishes internalization, revealing tail-dependent trafficking.","evidence":"Immunofluorescent antibody tracking, subcellular fractionation, cytoplasmic domain deletion mutants in AtT-20 cells","pmids":["7694691"],"confidence":"High","gaps":["Specific cytoplasmic tail sorting motifs not mapped","Ubiquitination or other post-translational signals for lysosomal targeting not investigated"]},{"year":1994,"claim":"The atomic structure of the E-selectin lectin/EGF domain was solved at 2.0 Å, revealing the Ca²⁺ coordination geometry and specific residues for carbohydrate contact, confirmed by mutagenesis — providing the structural basis for selectin-ligand recognition.","evidence":"X-ray crystallography at 2.0 Å resolution with site-directed mutagenesis and binding assays","pmids":["7509040"],"confidence":"High","gaps":["Co-crystal with sLex/sLea ligand not obtained","Structural basis for selectivity among selectin family members not resolved"]},{"year":1996,"claim":"E-selectin was shown to couple leukocyte binding to cytoskeletal remodeling: upon engagement it clusters at contact sites and its cytoplasmic domain recruits α-actinin, vinculin, filamin, paxillin, and FAK, while PSGL-1 was identified as an E-selectin ligand whose binding requires core 2 O-glycans but not tyrosine sulfation.","evidence":"Confocal microscopy, cytoskeletal fractionation, magnetic twisting cytometry, tailless mutant; CHO cell reconstitution with glycosyltransferases and tyrosine mutagenesis","pmids":["8609175","8621728"],"confidence":"High","gaps":["Direct binding partners within the cytoplasmic tail complex not mapped by domain interaction","Signaling consequences of cytoskeletal coupling in endothelial cells not defined"]},{"year":2001,"claim":"CD44 bearing sialylated, fucosylated N-glycans was identified as an additional E-selectin ligand on hematopoietic progenitor cells, mediating rolling under physiological shear over a wider range than PSGL-1, broadening the repertoire of E-selectin counter-receptors.","evidence":"Shear-based rolling assay on E-selectin-expressing bone marrow endothelium, selectin-Ig fusion protein binding, neutralizing antibodies","pmids":["11402070"],"confidence":"High","gaps":["Relative in vivo contribution of CD44 vs PSGL-1 on HPCs not established genetically","Specific N-glycan structures on CD44 mediating binding not characterized"]},{"year":2003,"claim":"Genetic knockout of E-selectin in mice demonstrated its in vivo requirement for accumulation of antigen-specific effector CD4⁺ T cells at peripheral antigen injection sites, establishing the physiological non-redundant role of E-selectin in effector T-cell trafficking.","evidence":"Adoptive transfer of antigen-specific CD4 T cells into E-selectin-deficient mice with whole-body tracking","pmids":["12629067"],"confidence":"High","gaps":["Whether P-selectin provides partial compensation in vivo not fully resolved","Tissue-specific requirements beyond skin not systematically addressed"]},{"year":2009,"claim":"A post-transcriptional negative feedback loop was identified: TNF induces miR-31 which targets the E-selectin 3′ UTR, dampening E-selectin expression and neutrophil adhesion — adding a miRNA layer to the transcriptional regulation already known.","evidence":"miR-31 mimic and antagonist transfection in endothelial cells with neutrophil adhesion functional readout","pmids":["19949084"],"confidence":"High","gaps":["Relative quantitative contribution of miR-31 vs mRNA instability in vivo not determined","Whether other miRNAs (miR-17-3p) act cooperatively not fully dissected"]},{"year":2010,"claim":"The signaling cascade triggered by E-selectin engagement on rolling neutrophils was dissected: PSGL-1 ligation activates SYK and FGR (Src family kinase), which via PLC and p38 MAPK extend LFA-1 to an intermediate conformation enabling slow rolling — linking selectin-mediated tethering to integrin activation.","evidence":"Flow-based rolling assay on immobilized E-selectin, conformation-specific integrin reporter antibodies, kinase inhibitors, PSGL-1 blocking","pmids":["20445017"],"confidence":"High","gaps":["Whether ESL-1 and CD44 activate distinct downstream kinases not fully mapped in same system","Structural basis for PSGL-1 transmembrane signal initiation unclear"]},{"year":2024,"claim":"An unexpected non-immune role emerged: E-selectin on lymphatic endothelial cells engages ITGA11 on cancer-associated fibroblasts, activating SRC–p-VEGFR3–MAPK to drive lymphangiogenesis and lymph node metastasis in bladder cancer.","evidence":"Single-cell RNA-seq, spatial transcriptomics, ITGA11-deficient mouse model, multicenter clinical cohort","pmids":["38428409"],"confidence":"Medium","gaps":["Whether E-selectin–ITGA11 interaction is direct or requires carbohydrate ligands not confirmed","Generalizability to other tumor types not established","Independent replication needed"]},{"year":null,"claim":"Key mechanistic questions remain: the identity of the second cis-element transcription factor cooperating with NF-κB, the structural basis of E-selectin–ligand selectivity from co-crystal structures with sLex/sLea, and whether the lymphangiogenesis-promoting role via ITGA11 represents a general E-selectin function beyond bladder cancer.","evidence":"","pmids":[],"confidence":"High","gaps":["No co-crystal structure with carbohydrate ligand","Second transcription factor for promoter induction unidentified","E-selectin function in lymphangiogenesis requires independent validation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,11,12,21,26]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[19]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,19,32]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[18]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[18]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,11,12,23,25,26]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5,25,28,31]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,1,19,21,26]}],"complexes":[],"partners":["SELPLG","CD44","ACTN1","VCL","FLNA","PXN","PTK2","ITGA11"],"other_free_text":[]},"mechanistic_narrative":"E-selectin (SELE/ELAM-1/CD62E) is a cytokine-inducible endothelial cell-surface C-type lectin that mediates calcium-dependent adhesion of leukocytes and tumor cells by recognizing sialyl-Lewis X and sialyl-Lewis A carbohydrate determinants displayed on glycoprotein ligands including PSGL-1, CD44, and ESL-1 [PMID:1701274, PMID:1714447, PMID:22021370]. Transcription is driven by NF-κB together with a second upstream cis-element in response to TNF, IL-1, and LPS, and is fine-tuned post-transcriptionally by labile-protein-dependent mRNA destabilization and TNF-induced miR-31 negative feedback [PMID:1713680, PMID:1710341, PMID:1382069, PMID:19949084]. Upon leukocyte engagement, E-selectin clusters at contact sites and its cytoplasmic domain links to an actin-associated complex containing α-actinin, vinculin, filamin, paxillin, and FAK, while ligand-specific outside-in signaling through PSGL-1 activates FGR/SYK to extend LFA-1 on rolling neutrophils, promoting slow rolling and downstream firm adhesion [PMID:8609175, PMID:20445017]. E-selectin directs skin-homing of CLA⁺ memory T cells and effector CD4⁺ T-cell accumulation at antigen sites, and on lymphatic endothelium engages ITGA11 on cancer-associated fibroblasts to activate SRC–p-VEGFR3–MAPK-driven lymphangiogenesis [PMID:1705666, PMID:12629067, PMID:38428409]."},"prefetch_data":{"uniprot":{"accession":"P16581","full_name":"E-selectin","aliases":["CD62 antigen-like family member E","Endothelial leukocyte adhesion molecule 1","ELAM-1","Leukocyte-endothelial cell adhesion molecule 2","LECAM2"],"length_aa":610,"mass_kda":66.7,"function":"Cell-surface glycoprotein having a role in immunoadhesion. Mediates in the adhesion of blood neutrophils in cytokine-activated endothelium through interaction with SELPLG/PSGL1. 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SUSD6","url":"https://www.omim.org/entry/616761"},{"mim_id":"616627","title":"PODOCALYXIN-LIKE 2; PODXL2","url":"https://www.omim.org/entry/616627"},{"mim_id":"616093","title":"BLOOD GROUP, ABO SYSTEM","url":"https://www.omim.org/entry/616093"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"urinary 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human chromosome 1.","date":"2006","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/16710414","citation_count":144,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11935152","id":"PMC_11935152","title":"Relation between glycaemic control, hyperinsulinaemia and plasma concentrations of soluble adhesion molecules in patients with impaired glucose tolerance or Type II diabetes.","date":"2002","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/11935152","citation_count":140,"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":53646,"output_tokens":6134,"usd":0.126474},"stage2":{"model":"claude-opus-4-6","input_tokens":9892,"output_tokens":3072,"usd":0.18939},"total_usd":0.704765,"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":68362,"output_tokens":8319,"usd":0.164936},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":12497,"output_tokens":3473,"usd":0.223965}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"ELAM-1 (E-selectin) mediates leukocyte cell adhesion by recognition of the carbohydrate ligand sialyl-Lewis X (NeuAc α2,3Gal β1,4(Fuc α1,3)-GlcNAc-), a terminal structure found on neutrophil cell-surface glycoproteins and glycolipids.\",\n      \"method\": \"Cell adhesion assays with ELAM-1-expressing cells, inhibition with anti-sialyl-Lex antibodies and sialyl-Lex-bearing proteins\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — independently replicated in two concurrent papers using complementary methods (inhibition assays, soluble ELAM-1 binding)\",\n      \"pmids\": [\"1701274\", \"1701275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 recognizes both sialyl-Lewis X and sialyl-Lewis A carbohydrate determinants; HSEA conformational calculations show these two hexasaccharides present neuraminic acid and fucose residues in similar spatial arrangements recognized by ELAM-1.\",\n      \"method\": \"Cell binding assay with immobilized synthetic glycoconjugates; HSEA computational modeling\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct cell binding reconstitution with purified synthetic ligands, replicated with multiple carbohydrate structures\",\n      \"pmids\": [\"1714447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Expression of an alpha(1,3)-fucosyltransferase cDNA confers ELAM-1-dependent endothelial adhesion on non-myeloid cells, demonstrating that specific fucosylation of sialylated lactosaminoglycans (sialyl Lewis X) is required for ELAM-1-dependent cell adhesion.\",\n      \"method\": \"Transfection of fucosyltransferase cDNA into non-myeloid cell lines; cell adhesion assays; flow cytometry for sialyl-Lex expression\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — gain-of-function reconstitution in multiple cell lines, mechanistically linking fucosyltransferase activity to ELAM-1 binding\",\n      \"pmids\": [\"1699667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ELFT, a cDNA encoding a 46 kDa protein with alpha(1,3)-fucosyltransferase activity, confers ELAM-1 binding activity when transfected into non-binding cell lines, indicating that a fucosylated carbohydrate structure is an essential component of the ELAM-1 ligand.\",\n      \"method\": \"cDNA cloning, transfection into non-binding cell lines, ELAM-1 adhesion assays, biochemical enzymatic activity assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of ELAM-1 binding activity by transfection of enzymatically characterized cDNA\",\n      \"pmids\": [\"1702034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Neutrophil LECAM-1 carries sialyl Lewis X modifications and presents these oligosaccharide ligands to ELAM-1 on vascular endothelium, with LECAM-1 concentrated on PMN microvilli (the site of initial cellular contact), explaining how LECAM-1 and ELAM-1 operate in the same CD18-independent adhesion pathway.\",\n      \"method\": \"Anti-LECAM-1/anti-ELAM-1 monoclonal antibody inhibition assays; ELAM-1-transfected cell adhesion; selective removal of LECAM-1; immunofluorescence microscopy for LECAM-1 localization on microvilli\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including functional inhibition, ELAM-1 transfectant binding, and direct localization\",\n      \"pmids\": [\"1716182\", \"1713515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 is an adhesion molecule for a unique skin-associated subset of circulating memory T cells that express cutaneous lymphocyte-associated antigen (CLA), functioning as a skin vascular addressin for skin-homing memory T lymphocytes.\",\n      \"method\": \"ELAM-1-transfected COS cell adhesion assays with defined T cell subsets; immunohistological survey of tissue specimens\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ELAM-1 transfectant binding assay with defined T cell subsets, replicated across multiple tissue types\",\n      \"pmids\": [\"1705666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 mediates activation-independent adhesion of resting memory CD4+ T cells to activated endothelium, in contrast to integrin-mediated pathways (LFA-1, VLA-4) which require acute T cell activation; this adhesion does not provide costimulatory signals for T cell proliferation or cytokine production.\",\n      \"method\": \"T cell adhesion assays to purified ELAM-1, VCAM-1, ICAM-1 substrates; anti-ELAM-1 antibody blocking; proliferation and cytokine secretion assays\",\n      \"journal\": \"Nature / The Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays, replicated across multiple independent studies\",\n      \"pmids\": [\"1705667\", \"1717633\", \"1710227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 gene transcription is activated by TNF, IL-1, and LPS via PKC-independent activation of NF-κB-like DNA binding activity; NF-κB binding to the ELAM-1 promoter is necessary but not sufficient for full transcriptional activation (PKC blockade inhibits transcription without blocking NF-κB binding).\",\n      \"method\": \"Nuclear runoff transcription assays; gel mobility shift assays; 5' deletion reporter constructs; PKC inhibitor experiments\",\n      \"journal\": \"PNAS / Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — nuclear runoff and gel shift assays, replicated by two independent labs with complementary reporter experiments\",\n      \"pmids\": [\"1713680\", \"1710341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Labile proteins play a dual role in ELAM-1 gene regulation: protein synthesis inhibitors (cycloheximide, anisomycin, emetine) superinduce ELAM-1 mRNA by both stabilizing the transcript and potentiating NF-κB-mediated transcription; the NF-κB binding sequence is necessary and sufficient for superinduction.\",\n      \"method\": \"Northern blot mRNA stability analysis; nuclear run-on transcription; NF-κB gel shift assays; promoter deletion analysis\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal mechanisms demonstrated in one study with rigorous controls\",\n      \"pmids\": [\"1382069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1-dependent adhesion of neutrophils and monocytes operates via a CD18-independent mechanism; anti-ELAM-1 antibody combined with anti-CD18 antibody nearly completely blocks neutrophil adherence to IL-1β-activated endothelium, identifying ELAM-1 and CD18 as two complementary adhesion pathways.\",\n      \"method\": \"Monoclonal antibody blocking adhesion assays; three-dimensional model for simultaneous determination of leukocyte adherence and migration; LAD patient neutrophils\",\n      \"journal\": \"Blood / Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal antibody blocking with defined cell populations, replicated across multiple studies\",\n      \"pmids\": [\"1726710\", \"2570036\", \"1713515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The sialyl Lewis X ligand for ELAM-1 is carried on O-linked oligosaccharides or glycolipids rather than complex N-linked glycans, as inhibitors of N-linked glycoprotein processing (N-methyl-deoxynojirimycin, 1-deoxymannojirimycin, swainsonine) do not affect ELAM-1-dependent adhesion of HL60 cells.\",\n      \"method\": \"Adhesion assay with specific N-linked glycan biosynthesis inhibitors on HL60 cells binding to ELAM-1-expressing HUVEC\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical inhibitors tested, but single lab, negative result type evidence\",\n      \"pmids\": [\"1721027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ELAM-1 surface expression is induced on human umbilical vein endothelial cells by inflammatory cytokines (TNF, IL-1) and LPS, but is not constitutively expressed; a blocking monoclonal antibody (BB11) immunoprecipitates ELAM-1 and blocks interaction with PMN, HL60, and HT29 cells.\",\n      \"method\": \"Immunoprecipitation; flow cytometry; cell adhesion blocking assay\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — immunoprecipitation plus functional blocking, but single lab\",\n      \"pmids\": [\"1697461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"IFN-γ enhances and prolongs TNF/IL-1/LPS-induced ELAM-1 expression on activated endothelial cells and abrogates the refractory period for ELAM-1 restimulation, while IFN-γ alone does not induce ELAM-1 expression.\",\n      \"method\": \"Flow cytometry for ELAM-1 surface expression; time-course experiments with cytokine combinations\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dose- and time-response experiments with multiple cytokine combinations, single lab\",\n      \"pmids\": [\"1697876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"ELAM-1 is involved in monocyte adhesion to activated endothelial cells; monocytes express a counter-structure for ELAM-1, and this interaction is best revealed at reduced temperatures or with metabolically inactive monocytes, demonstrating that ELAM-1-monocyte interaction is superseded by CD18-dependent mechanisms at 37°C.\",\n      \"method\": \"Adhesion assays at 4°C vs 37°C with fixed vs live monocytes; ELAM-1-transfected COS cell binding; anti-ELAM-1 F(ab')2 blocking\",\n      \"journal\": \"Scandinavian Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple experimental conditions confirming ELAM-1/monocyte interaction, single lab\",\n      \"pmids\": [\"1371364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Interaction of TNF with the 55 kDa TNF receptor (not a novel endothelial-specific receptor) mediates induction of ELAM-1 and ICAM-1 on HUVECs; 125I-TNF cross-linking on HUVECs reveals the characteristic 55 kDa TNF receptor complex, confirmed with receptor-specific monoclonal antibodies.\",\n      \"method\": \"Receptor cross-linking with 125I-TNF; monoclonal antibody blocking with antibodies to different TNF epitopes; receptor-specific antibody confirmation\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cross-linking plus antibody approaches, single lab\",\n      \"pmids\": [\"1381227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Outside-to-inside (reverse) signaling through membrane TNF-α induces E-selectin (CD62E/ELAM-1) expression on activated human CD4+ T cells and HTLV-I-infected T cell lines; this induction is at the transcriptional level, demonstrating that E-selectin can be expressed on cell types other than endothelial cells.\",\n      \"method\": \"Anti-TNF-α antibody activation of membrane TNF-α; Northern blot and RT-PCR; cell-to-cell contact experiments with TNF receptor-expressing HeLa cells; transfection of wild-type and cleavage-resistant mutant membrane TNF-α\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell systems and reverse signaling validated with mutant TNF-α, single lab\",\n      \"pmids\": [\"11123285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CD62E-dependent migration mediates preferential accumulation of antigen-specific effector CD4 T cells at sites of antigen injection; the most-divided effector T cells from draining lymph nodes enter antigen deposition sites via recognition of CD62E on blood vessels.\",\n      \"method\": \"Whole-body tracking of antigen-specific CD4 T cells; CD62E-deficient recipient mice (epistasis); flow cytometry for CD62P binding capacity\",\n      \"journal\": \"The Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis using CD62E-knockout mice with defined antigen-specific T cell tracking\",\n      \"pmids\": [\"12629067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Binding of PMNs to E-selectin (CD62E) on transfected CHO cells or IL-1β-activated HUVECs does not promote PMN activation (no increase in CD11b/CD18 surface expression, no appearance of CD11b activation epitope, no L-selectin shedding), indicating that E-selectin functions as a tethering molecule without providing inter-receptor activation signals.\",\n      \"method\": \"Flow cytometry for activation markers (CD11b, CD11b*, CD62L) on PMNs adherent to E-selectin transfectants; confocal microscopy with in situ staining; CD62E-blocking antibody\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple activation markers assessed with orthogonal methods, CHO transfectant system isolates E-selectin function\",\n      \"pmids\": [\"9218615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Dimethylfumarate selectively inhibits TNF-induced CD62E (E-selectin) expression via an NF-κB-dependent mechanism (inhibiting NF-κB but not AP-1 promoter activation), without affecting CD54 (ICAM-1) expression at concentrations ≤70 μM.\",\n      \"method\": \"Flow cytometry; reporter constructs (CD62E, NF-κB, AP-1 promoters); in vivo reduction of CD62E on psoriatic dermal microvessels after oral treatment\",\n      \"journal\": \"The Journal of Investigative Dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple reporter constructs plus in vivo validation, single lab\",\n      \"pmids\": [\"11886496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"ELAM-1 expression on vascular endothelium is localized ultrastructurally to the apical plasma membrane and microvillus-like projections; expression is restricted to certain segments of post-capillary venules and is not associated with toxic cellular ultrastructural alterations.\",\n      \"method\": \"Immunogold labeling for light and electron microscopy (preembedding immunocytochemistry); HR-SEM with secondary and backscattered electron imaging\",\n      \"journal\": \"Micron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct ultrastructural localization with immunogold, single lab\",\n      \"pmids\": [\"7520816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CD15 (sialyl Lewis X) on non-small cell lung cancer cells interacts with CD62E (E-selectin) on TNF-α-activated brain endothelial cells to mediate cancer cell adhesion under both static and physiological flow conditions, implicating this CD15/CD62E interaction in lung-to-brain metastasis.\",\n      \"method\": \"CD15 immunoblocking adhesion assays under static and shear stress (live-cell flow conditions); flow cytometry; Western blot; immunohistochemistry of human brain metastasis biopsies\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional blocking under physiological flow conditions with human tissue validation, single lab\",\n      \"pmids\": [\"26472821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PDGFRα+ITGA11+ cancer-associated fibroblasts promote lymphangiogenesis in early-stage bladder cancer by interacting via ITGA11 with its surface receptor SELE (E-selectin) on lymphatic endothelial cells, activating the SRC-p-VEGFR3-MAPK signaling pathway.\",\n      \"method\": \"Single-cell RNA sequencing; spatial transcriptomics; PDGFRα+ITGA11+ CAF-specific mouse model; Co-IP/binding interaction studies; pathway inhibition experiments\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mouse model plus pathway activation studies, but novel interaction not independently replicated\",\n      \"pmids\": [\"38428409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VEGF/VEGFR-2 signaling in endothelial cells induces CD62E (E-selectin) expression via NF-κB-dependent activation of the CD62E promoter (peaking at 12h), which in turn mediates transendothelial migration of haematopoietic progenitor cells toward gliomas; neutralizing anti-CD62E antibodies strongly reduce HPC homing to orthotopic gliomas in vivo.\",\n      \"method\": \"Reporter gene assays (NF-κB-dependent CD62E promoter); neutralizing antibodies in vivo; flow cytometry; tissue microarray\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter plus in vivo neutralization, single lab\",\n      \"pmids\": [\"18689869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-1α and IL-1β, but not IL-6, simultaneously lower intraocular pressure and induce ELAM-1/SELE expression in trabecular meshwork; TGF-β2 acts as an IL-1 antagonist counteracting both IOP reduction and ELAM-1 induction; IL-1α activates an autocrine feedback loop involving its own mRNA upregulation.\",\n      \"method\": \"Porcine anterior eye perfusion culture; RT-PCR and Western blot for ELAM-1 expression; IOP measurement\",\n      \"journal\": \"Investigative Ophthalmology & Visual Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional organ perfusion model with molecular validation, single lab\",\n      \"pmids\": [\"20861478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"POAG-causing MYOC mutations (Q368X, Y437H) activate the IL-1/NF-κB inflammatory stress pathway and co-induce SELE (E-selectin) expression in trabecular meshwork cells; intracellular retention of mutant MYOC correlates with pathway activation, while wild-type MYOC inhibits IL-1/NF-κB activation.\",\n      \"method\": \"Transient transfection and doxycycline-inducible lentiviral expression; RT-PCR; ELISA for IL-1α; NF-κB luciferase reporter assay\",\n      \"journal\": \"Molecular Vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple MYOC mutants tested with inducible system, NF-κB reporter, single lab\",\n      \"pmids\": [\"26396484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Rabbit ELAM-1 shares 74% amino acid identity with human ELAM-1, contains the same domain architecture (lectin-EGF-complement regulatory elements-transmembrane-cytoplasmic), but has five (vs. six in humans) complement regulatory elements; individual protein domains are encoded by distinct exons, consistent with evolution by exon duplication and rearrangement.\",\n      \"method\": \"cDNA and genomic DNA sequencing; structural domain analysis; COS cell transfection functional assay; cross-species leukocyte adhesion assay\",\n      \"journal\": \"DNA and Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — combined sequence analysis, genomic organization, and functional validation in transfected cells\",\n      \"pmids\": [\"1372169\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"E-selectin (SELE/ELAM-1) is a cytokine-inducible (TNF, IL-1, LPS) endothelial cell-surface lectin whose transcription is driven by NF-κB binding to its promoter; it mediates CD18-independent rolling and tethering of neutrophils, monocytes, and skin-homing memory T cells by recognizing sialyl-Lewis X and sialyl-Lewis A carbohydrate determinants (displayed on O-linked glycoproteins and glycolipids, synthesized by specific alpha(1,3)-fucosyltransferases); binding to E-selectin supports initial cell capture without activating downstream integrin signaling, while reverse signaling through membrane TNF-α can induce E-selectin on T cells, and VEGF/VEGFR-2 and ITGA11 signals from the microenvironment can activate its expression and downstream SRC-MAPK pathways on endothelial cells.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"ELAM-1 (SELE/E-selectin) was cloned by transient expression in COS cells from a subtracted cDNA library of cytokine-treated endothelial cells. The predicted protein structure contains an amino-terminal lectin-like domain, an EGF domain, and six tandem complement regulatory repeat motifs. Expression is cytokine-inducible, reaching maximum at 2–4 hours and decaying by 24 hours, and transfected cells support adhesion of neutrophils and HL-60 cells in a Ca2+-dependent but temperature-independent manner.\",\n      \"method\": \"cDNA cloning by transient expression/functional adhesion selection, structural domain analysis, transfection adhesion assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning and functional characterization with multiple orthogonal methods; foundational paper with >2000 citations\",\n      \"pmids\": [\"2466335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ELAM-1 (E-selectin) mediates cell adhesion by recognizing the carbohydrate ligand sialyl-Lewis X (NeuAc α2,3Gal β1,4[Fuc α1,3]GlcNAc), a terminal structure on neutrophil glycoproteins and glycolipids, establishing the lectin function of its N-terminal carbohydrate recognition domain.\",\n      \"method\": \"Cell adhesion inhibition assay with purified carbohydrate structures and monoclonal antibodies; COS-cell transfection adhesion assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct ligand identification replicated in two independent simultaneous studies (PMIDs 1701274 and 1701275) with >1000 citations each\",\n      \"pmids\": [\"1701274\", \"1701275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Transfection of an α(1,3)-fucosyltransferase cDNA into non-myeloid cells confers ELAM-1-dependent endothelial adhesion, with binding activity correlating with de novo cell-surface expression of sialyl-Lewis X. This demonstrated that specific fucosyltransferases regulate ELAM-1 ligand biosynthesis.\",\n      \"method\": \"Fucosyltransferase cDNA transfection, flow cytometry for sLex expression, ELAM-1-dependent adhesion assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional reconstitution by transfection with direct biochemical correlation; >650 citations\",\n      \"pmids\": [\"1699667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ELFT, a cloned α(1,3)-fucosyltransferase specifically expressed in cell types that bind ELAM-1, confers ELAM-1 binding activity when transfected into non-binding cell lines, indicating that a fucosylated carbohydrate structure is an essential component of the ELAM-1 ligand.\",\n      \"method\": \"cDNA cloning, transfection-based adhesion assay, enzymatic activity assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of ELAM-1 binding by fucosyltransferase expression; >325 citations\",\n      \"pmids\": [\"1702034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"ELAM-1 gene transcription is activated by TNF, IL-1, and LPS via PKC-independent activation of NF-κB-like DNA binding activity in endothelial cells, as demonstrated by nuclear run-on experiments and gel mobility shift assays. PKC blockade inhibits ELAM-1 transcription despite intact NF-κB activation, indicating NF-κB is necessary but not sufficient.\",\n      \"method\": \"Nuclear run-on transcription assay, gel mobility shift assay, PKC inhibitor studies, promoter sequence analysis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods defining transcriptional mechanism; replicated by independent study (PMID 1710341)\",\n      \"pmids\": [\"1713680\", \"1710341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The ELAM-1 promoter contains an NF-κB consensus binding site (−94 to −85) that is necessary but not sufficient for cytokine-induced transcription; a second cis-acting element between −233 and −117 is also required, demonstrating that cytokine induction of ELAM-1 involves combinatorial transcription factor action.\",\n      \"method\": \"Reporter gene deletion mutant constructs, gel shift assay, transient transfection in endothelial and non-endothelial cells\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter dissection with multiple deletion constructs and orthogonal gel-shift assays\",\n      \"pmids\": [\"1710341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Both sialyl-Lewis A (NeuAc α2-3Gal β1-3[Fuc α1-4]GlcNAc) and sialyl-Lewis X are potent ligands for ELAM-1, recognizing a common carbohydrate domain involving neuraminic acid and fucose. Molecular modeling (HSEA calculations) shows both hexasaccharides adopt similar three-dimensional conformations.\",\n      \"method\": \"Cell binding assay with immobilized synthetic glycoconjugates, ELAM-1 cDNA transfectants, HSEA molecular modeling\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding assay with synthetic carbohydrates and structural modeling; >436 citations\",\n      \"pmids\": [\"1714447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The ELAM-1 gene spans ~13 kb, contains 14 exons, is present as a single copy on human chromosome 1q12→qter, and has exon-intron boundaries that correlate with functional protein domain subdivisions (lectin domain, EGF domain, six complement regulatory repeats each encoded by distinct exons). The promoter contains NF-κB and AP-1 consensus sites.\",\n      \"method\": \"Genomic cloning, restriction mapping, sequencing, exon-intron boundary determination, human-mouse somatic hybrid cell panel for chromosomal mapping\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete gene structure determination with chromosomal localization; >176 citations\",\n      \"pmids\": [\"1703529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Neutrophil LECAM-1 (L-selectin) bears sialyl-Lewis X modifications and can present this oligosaccharide ligand to ELAM-1 on endothelial cells. LECAM-1 is concentrated on PMN surface microvilli (initial contact sites), and anti-LECAM-1 antibodies or selective LECAM-1 removal inhibit PMN binding to ELAM-1 transfectants by up to 70%, identifying a receptor-counterreceptor interaction between the two selectins.\",\n      \"method\": \"Anti-LECAM-1 antibody blocking, selective LECAM-1 removal, adhesion assays with ELAM-1 transfected cells, flow cytometry, immunoelectron microscopy\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple blocking and depletion approaches in same study; >566 citations\",\n      \"pmids\": [\"1716182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The sialyl-Lewis X ligand for ELAM-1 on HL-60 cells is not carried by N-linked oligosaccharides (complex-type N-glycans), since inhibitors of N-linked glycoprotein processing (N-methyl-deoxynojirimycin, 1-deoxymannojirimycin, swainsonine) do not affect ELAM-1-dependent adhesion, suggesting the ligand is a glycolipid or O-linked glycoprotein.\",\n      \"method\": \"Glycosylation processing inhibitors (N-methyl-deoxynojirimycin, deoxymannojirimycin, swainsonine), cell adhesion assay with HUVEC\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological approach with clear negative results; single lab, single method type\",\n      \"pmids\": [\"1721027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"IFN-γ enhances and prolongs ELAM-1 expression on TNF/IL-1/LPS-activated endothelial cells, abrogates the refractory period for ELAM-1 restimulation, and potentiates IL-6 production, defining a regulatory role for IFN-γ in modulating ELAM-1-dependent inflammatory adhesion.\",\n      \"method\": \"Flow cytometry for cell-surface ELAM-1, cytokine co-stimulation experiments in HUVEC, cytokine pre-treatment timing studies\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple timing conditions tested; single lab\",\n      \"pmids\": [\"1697876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 exclusively mediates adhesion of memory (CD45RO+) but not naive CD4+ T cells, and this adhesion is independent of acute T-cell activation signals that regulate integrin-mediated adhesion, demonstrating a distinct, activation-independent adhesion pathway for memory T-cell subset trafficking.\",\n      \"method\": \"Adhesion assay to purified ELAM-1, antibody blocking, T-cell subset characterization by flow cytometry\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated by two independent Nature publications (PMIDs 1705666 and 1705667) and confirmed in JCB (PMID 1710227); mechanistically defined activation-independent property\",\n      \"pmids\": [\"1705667\", \"1705666\", \"1710227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 mediates adhesion of a skin-homing subset of circulating memory T cells defined by cutaneous lymphocyte-associated antigen (CLA), as shown by ELAM-1-transfected COS cell adhesion assays. Vascular ELAM-1 expression is preferentially found in cutaneous over non-cutaneous inflammatory sites, supporting its role as a skin vascular addressin.\",\n      \"method\": \"ELAM-1-transfected COS cell adhesion assay, T-cell subset flow cytometry, immunohistology of tissue specimens\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct functional adhesion assay combined with in vivo immunohistology; >829 citations\",\n      \"pmids\": [\"1705666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Labile (short-lived) proteins play a dual role in ELAM-1 gene regulation: they destabilize ELAM-1 mRNA and suppress NF-κB binding activity in resting cells. Protein synthesis inhibitors (cycloheximide, anisomycin, emetine) superinduce ELAM-1 mRNA by stabilizing the transcript and potentiating NF-κB binding, with the NF-κB binding site in the promoter being necessary and sufficient for superinduction.\",\n      \"method\": \"Protein synthesis inhibitors, mRNA half-life measurements, nuclear run-on transcription assay, NF-κB gel shift assay, promoter deletion reporter assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple complementary mechanistic approaches (transcription, mRNA stability, promoter deletion, EMSA); single lab with rigorous controls\",\n      \"pmids\": [\"1382069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ELAM-1 binds monocytes through a counter-structure on monocytes; at reduced metabolic activity (4°C or fixed monocytes), anti-ELAM-1 F(ab')2 strongly blocks monocyte adhesion to activated HUVEC following kinetics that parallel ELAM-1 surface expression, and is confirmed using ELAM-1-transfected COS cells.\",\n      \"method\": \"Antibody blocking adhesion assay at 37°C and 4°C, fixed-cell adhesion, COS-cell transfection adhesion assay\",\n      \"journal\": \"Scandinavian Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple conditions and transfected-cell confirmation; single lab\",\n      \"pmids\": [\"1371364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Labile proteins play a dual role in controlling ELAM-1 gene expression through both mRNA stability and transcriptional mechanisms; treatment with protein synthesis inhibitors superinduces ELAM-1 via NF-κB-dependent promoter activation and mRNA stabilization.\",\n      \"method\": \"Nuclear run-on assay, mRNA half-life determination, gel shift assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mechanistic dissection at transcriptional and post-transcriptional levels with multiple methods\",\n      \"pmids\": [\"1382069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Sialyl-Lewis A (SLea) on pancreatic carcinoma cells mediates adhesion to E-selectin on cytokine-activated endothelial cells; anti-E-selectin and anti-SLea antibodies block augmented attachment at both 4°C and 25°C, while anti-SLex does not, revealing SLea as the dominant ELAM-1 ligand on these tumor cells.\",\n      \"method\": \"Adhesion assay to IL-1β/TNF-α-activated HUVEC, antibody blocking (anti-E-selectin, anti-SLea, anti-SLex), flow cytometry for E-selectin expression\",\n      \"journal\": \"International Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple antibody blocking conditions; single lab\",\n      \"pmids\": [\"7687590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The crystal structure of the lectin/EGF domain region of human E-selectin was determined at 2.0 Å resolution, revealing limited interdomain contact, Ca2+ coordination distinct from other C-type lectins, and a specific region/amino acid side chains involved in ligand binding as confirmed by mutagenesis.\",\n      \"method\": \"X-ray crystallography at 2.0 Å, site-directed mutagenesis, functional binding assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic-resolution structure combined with mutagenesis functional validation; >345 citations\",\n      \"pmids\": [\"7509040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"After surface expression, internalized E-selectin is routed exclusively to endosomes and lysosomes for degradation, in contrast to P-selectin which recycles to Weibel-Palade body storage granules. Deletion of the cytoplasmic domain abolishes internalization of both selectins, demonstrating cytoplasmic-tail-dependent intracellular trafficking.\",\n      \"method\": \"Immunofluorescent antibody tracking, subcellular fractionation, Western blot, AtT-20 cell transfection with cytoplasmic domain deletion mutants\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct intracellular antibody routing, subcellular fractionation, and cytoplasmic domain deletion mutants; >150 citations\",\n      \"pmids\": [\"7694691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Leukocyte adhesion to cytokine-activated endothelium induces transmembrane linkage of E-selectin to the actin cytoskeleton through its cytoplasmic domain. E-selectin clusters at leukocyte attachment sites, co-purifies with α-actinin, vinculin, filamin, paxillin, and focal adhesion kinase (FAK) but not talin. A tailless (cytoplasmic domain-deleted) E-selectin mutant supports leukocyte attachment but fails to associate with the cytoskeleton or resist mechanical stress.\",\n      \"method\": \"Confocal microscopy, detergent-based cytoskeletal fractionation, Western blot, paramagnetic bead pull-down, magnetic twisting cytometer, COS-7 cell transfection with tailless mutant\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (confocal, fractionation, mechanical stress, domain mutant); >162 citations\",\n      \"pmids\": [\"8609175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"PSGL-1 requires core 2 O-linked glycans (sialylated and fucosylated) to bind E-selectin, but unlike P-selectin binding, E-selectin binding by PSGL-1 does not require tyrosine sulfation, as phenylalanine replacement of three consensus tyrosines abolished P-selectin binding but not E-selectin binding.\",\n      \"method\": \"CHO cell co-transfection with PSGL-1, C2GnT, and α1,3-fucosyltransferases; tyrosine-to-phenylalanine mutagenesis; binding assays to selectin-expressing cells\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in CHO cells with defined glycosyltransferases plus site-directed mutagenesis; >264 citations\",\n      \"pmids\": [\"8621728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CD44, modified with sialylated, fucosylated N-glycans (not O-glycans), functions as an E-selectin ligand on human hematopoietic progenitor cells (HPCs), mediating rolling on E-selectin-expressing bone marrow endothelial cells under physiological flow conditions over a wider shear range than PSGL-1.\",\n      \"method\": \"Shear-based adherence assay, immunopurification of membrane proteins, flow cytometry, neutralizing antibodies, selectin-Ig fusion protein binding assays\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — physiological flow-based functional assay with antibody confirmation; >246 citations\",\n      \"pmids\": [\"11402070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Outside-to-inside (reverse) signaling through membrane TNF-α induces E-selectin (CD62E) expression on activated CD4+ T cells and HTLV-I-infected T cell lines (not just endothelial cells), via transcriptional upregulation. Wild-type and cleavage-resistant membrane TNF-α mutant both support CD62E induction by anti-TNF-α antibody, confirming the reverse-signaling mechanism.\",\n      \"method\": \"Anti-TNF-α antibody stimulation of membrane TNF-α-expressing cells, Northern blot, RT-PCR, transfection with WT and mutant membrane TNF-α in Jurkat and HeLa cells, cell-cell contact assay\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell systems and mutant confirmation; single lab\",\n      \"pmids\": [\"11123285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Preferential accumulation of antigen-specific effector CD4 T cells at an antigen injection site requires CD62E (E-selectin) expression on blood vessels; the most-divided effector CD4 T cells bind CD62P in draining lymph nodes, then enter the injection site via CD62E recognition, and are retained in a nonproliferative state by peptide-MHC II recognition.\",\n      \"method\": \"Adoptive transfer of antigen-specific CD4 T cells tracked in whole body, CD62E-deficient recipient mice (genetic knockout), antigen injection model\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout experiment with whole-body T-cell tracking; >112 citations\",\n      \"pmids\": [\"12629067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TNF-induced miRNAs miR-31 and miR-17-3p provide negative feedback control of E-selectin expression by pairing with target sequences in E-selectin mRNA 3' UTR. Specific antagonism of miR-31 increased neutrophil adhesion to endothelial cells, while miR-31 mimic transfection decreased adhesion, establishing a post-transcriptional regulatory loop.\",\n      \"method\": \"miRNA antagonism and mimic transfection in endothelial cells, neutrophil adhesion assay, 3'-UTR target identification\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional gain/loss-of-function miRNA experiments with functional readout; >281 citations\",\n      \"pmids\": [\"19949084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human neutrophil rolling on E-selectin (or P-selectin) induces the extended (KIM127/NKI-L16 epitopes) but not the high-affinity conformation (mAb24 epitope) of LFA-1 (αLβ2), in a PSGL-1-, Src family kinase (FGR)-, and SYK-dependent manner, promoting slow rolling but not firm adhesion. This signaling requires phospholipase C and p38 MAP kinase.\",\n      \"method\": \"Flow-based rolling assay on immobilized E-selectin and P-selectin, reporter antibody binding assay for integrin conformational epitopes, kinase inhibitors, PSGL-1 blocking antibody\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection using multiple kinase inhibitors and conformation-specific antibodies under flow conditions; >138 citations\",\n      \"pmids\": [\"20445017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PSGL-1, CD44, and ESL-1 are physiologic glycoprotein ligands for E-selectin on mature leukocytes mediating tethering and rolling. PSGL-1 and CD44 induce signals that activate β2 integrin LFA-1 and promote slow rolling, whereas ESL-1 induces signals that activate Mac-1 in adherent neutrophils, assigning specialized adhesive and signaling roles to distinct E-selectin ligands.\",\n      \"method\": \"Flow-based adhesion assay, genetic knockout mice, integrin activation assays, signaling pathway analysis (literature synthesis with cited mouse experiments)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive mechanistic review synthesizing in vivo genetic data from multiple labs; >361 citations\",\n      \"pmids\": [\"22021370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Dimethylfumarate (DMF) at ≤70 µM specifically inhibits TNF-induced CD62E (E-selectin) but not CD54 (ICAM-1) expression in endothelial cells by inhibiting NF-κB (but not AP-1) promoter activation, as demonstrated using CD62E-, NF-κB-, and AP-1-responsive promoter reporter constructs. A 60-min preincubation is sufficient for 24-h blockade; the hydrolysis product methylhydrogenfumarate is inactive.\",\n      \"method\": \"Flow cytometry, NF-κB/AP-1/CD62E promoter-reporter transfection assays, in vivo skin biopsy immunohistochemistry in psoriasis patients treated with oral fumaric acid esters\",\n      \"journal\": \"Journal of Investigative Dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic promoter reporter assay with in vivo correlation; single lab\",\n      \"pmids\": [\"11886496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Indoxyl sulfate (a uremic toxin) enhances E-selectin expression on TNF-α-activated HUVEC via JNK- and NF-κB-dependent pathways (not through ICAM-1 or VCAM-1), and in vivo anti-E-selectin antibody treatment reduces indoxyl sulfate-induced leukocyte adhesion to the femoral artery in nephrectomized mice.\",\n      \"method\": \"Flow cytometry, JNK/NF-κB kinase inhibitors, NAD(P)H oxidase inhibitor, flow-based adhesion assay, anti-E-selectin antibody in CKD mouse model\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro pathway dissection with in vivo antibody validation; single lab; >150 citations\",\n      \"pmids\": [\"20937831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"E-selectin (CD62E) on tumor blood vessels is down-regulated in squamous cell carcinomas (SCCs), resulting in reduced CLA+ T-cell infiltration. TLR7 agonist imiquimod induces E-selectin on tumor vessels and recruits CLA+CD8+ T cells with evidence of tumor regression, demonstrating that tumor immune evasion involves active suppression of vascular E-selectin.\",\n      \"method\": \"Immunohistochemistry of human SCC biopsies, imiquimod treatment (in vivo and in vitro), flow cytometry, regulatory T-cell functional assays\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro experiments with functional immune outcomes; single lab; >179 citations\",\n      \"pmids\": [\"18794336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SELE (E-selectin/CD62E) expression in trabecular meshwork cells is co-induced with MYOC mutations (Q368X, Y437H) that activate the IL-1/NF-κB inflammatory stress pathway; wild-type MYOC inhibits NF-κB activity and decreases SELE induction, establishing SELE as a downstream marker of the IL-1/NF-κB pathway in trabecular meshwork glaucoma pathology.\",\n      \"method\": \"Lentiviral stable transduction with doxycycline-inducible mutant MYOC constructs, RT-PCR, ELISA for IL-1α protein, NF-κB luciferase reporter assay\",\n      \"journal\": \"Molecular Vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — inducible expression system with luciferase reporter and protein quantification; single lab\",\n      \"pmids\": [\"26396484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PDGFRα+ITGA11+ cancer-associated fibroblasts (CAFs) promote lymphangiogenesis by recognizing SELE (E-selectin) on lymphatic endothelial cells via the ITGA11 surface receptor, activating the SRC-p-VEGFR3-MAPK signaling pathway to drive lymphovascular invasion and lymph node metastasis in early-stage bladder cancer.\",\n      \"method\": \"Single-cell RNA sequencing, spatial transcriptomics, CAF-specific ITGA11-deficient mouse model, multicenter clinical cohort (910 cases), signaling pathway analysis\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse genetic model with pathway mechanistic validation; single lab; >113 citations\",\n      \"pmids\": [\"38428409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"After surface induction, E-selectin protein distributes over the entire apical endothelial cell surface including microvillus-like projections (particularly with TNF-α), as demonstrated by immunogold labeling with TEM and HR-SEM. LPS treatment produces the highest density of E-selectin surface labeling without inducing cytotoxicity or ultrastructural changes.\",\n      \"method\": \"Immunogold labeling (silver-enhanced colloidal gold), transmission electron microscopy (TEM), high-resolution scanning electron microscopy (HR-SEM), quantitative gold particle counting\",\n      \"journal\": \"Micron\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 — direct ultrastructural localization; single lab, descriptive with limited functional follow-up\",\n      \"pmids\": [\"7520816\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SELE (E-selectin/ELAM-1) is a cytokine-inducible endothelial cell-surface glycoprotein whose transcription is activated by NF-κB (and a second upstream cis-element) in response to TNF, IL-1, and LPS; it functions as a C-type lectin that binds sialyl-Lewis X and sialyl-Lewis A carbohydrate ligands (displayed on PSGL-1, CD44, CEA, and glycolipids on leukocytes and tumor cells) through its N-terminal lectin/EGF domain whose structure is known at 2.0 Å; upon leukocyte binding it clusters at contact sites and links via its cytoplasmic domain to an actin-associated complex including α-actinin, vinculin, filamin, paxillin, and FAK, while after endocytosis it is routed to lysosomes for degradation; its expression is post-transcriptionally regulated by TNF-induced miR-31 providing negative feedback, and it mediates skin-homing of CLA+ memory T cells, neutrophil rolling with downstream LFA-1 activation through PSGL-1-SYK-FGR signaling, and on lymphatic endothelial cells engages ITGA11 on CAFs to activate SRC-p-VEGFR3-MAPK-driven lymphangiogenesis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"E-selectin (SELE/ELAM-1) is a cytokine-inducible endothelial cell-surface C-type lectin that mediates the initial tethering and rolling of neutrophils, monocytes, and skin-homing memory T cells on activated vascular endothelium through a CD18-independent adhesion pathway [PMID:9218615, PMID:1726710, PMID:1705666]. Its expression is induced by TNF, IL-1, and LPS via NF-κB-dependent transcriptional activation of the SELE promoter, with additional induction by VEGF/VEGFR-2 signaling; IFN-γ enhances and prolongs this expression without being sufficient on its own [PMID:1713680, PMID:18689869, PMID:1697876]. E-selectin recognizes sialyl-Lewis X and sialyl-Lewis A carbohydrate determinants presented on O-linked glycoproteins and glycolipids, whose biosynthesis requires specific α(1,3)-fucosyltransferases; binding supports initial cell capture without triggering integrin activation or costimulatory signaling in leukocytes [PMID:1701274, PMID:1714447, PMID:1699667, PMID:9218615]. Beyond classical endothelial expression, reverse signaling through membrane TNF-α can induce E-selectin on activated CD4+ T cells, and E-selectin-dependent migration directs effector T cell accumulation at antigen deposition sites in vivo [PMID:11123285, PMID:12629067].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Identification of sialyl-Lewis X as the carbohydrate ligand for ELAM-1 established the molecular basis for selectin-mediated leukocyte-endothelial recognition, resolving how a lectin domain achieves cell-type-specific adhesion.\",\n      \"evidence\": \"Cell adhesion assays with ELAM-1-expressing cells, anti-sLex antibody inhibition, and gain-of-function fucosyltransferase transfection into non-myeloid cells\",\n      \"pmids\": [\"1701274\", \"1701275\", \"1699667\", \"1702034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific protein scaffolds presenting sLex to ELAM-1 on leukocytes not yet identified\",\n        \"Relative contribution of glycolipid vs. glycoprotein carriers of sLex unknown\"\n      ]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Demonstration that ELAM-1 also binds sialyl-Lewis A, and that its ligands are carried on O-linked glycans or glycolipids rather than complex N-linked glycans, refined the carbohydrate recognition specificity and structural context of ligand display.\",\n      \"evidence\": \"Synthetic glycoconjugate binding assays and HSEA conformational modeling; N-glycan biosynthesis inhibitor experiments on HL60 cells\",\n      \"pmids\": [\"1714447\", \"1721027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Complete atomic-resolution structure of ELAM-1 lectin domain bound to sLex/sLea not determined\",\n        \"In vivo relevance of sLea versus sLex not tested\"\n      ]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Mapping of ELAM-1 transcriptional regulation to NF-κB binding at its promoter, driven by TNF/IL-1/LPS via a PKC-independent pathway, established the inflammatory signaling cascade controlling endothelial selectin expression.\",\n      \"evidence\": \"Nuclear runoff assays, gel mobility shift assays, 5′ deletion reporter constructs, PKC inhibitor experiments in HUVEC\",\n      \"pmids\": [\"1713680\", \"1710341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of PKC-independent co-activator(s) required beyond NF-κB binding not resolved\",\n        \"Role of chromatin remodeling at the ELAM-1 promoter unexplored\"\n      ]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Defining ELAM-1 as a CD18-independent adhesion pathway for neutrophils and as a vascular addressin for CLA+ skin-homing memory T cells established its non-redundant role in leukocyte subset-selective recruitment.\",\n      \"evidence\": \"Combined anti-ELAM-1/anti-CD18 antibody blocking; ELAM-1-transfected COS cell adhesion with defined T cell subsets; LAD patient neutrophils\",\n      \"pmids\": [\"1726710\", \"1705666\", \"1705667\", \"1713515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular identity of T cell counter-receptor (later identified as CLA/PSGL-1) not fully resolved in these studies\",\n        \"In vivo trafficking studies in humans not performed\"\n      ]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Discovery that labile repressor proteins regulate ELAM-1 mRNA stability and NF-κB-dependent transcription explained the transient kinetics of ELAM-1 expression after inflammatory stimulation.\",\n      \"evidence\": \"Protein synthesis inhibitor superinduction; northern blot mRNA stability; nuclear run-on; NF-κB promoter deletion analysis\",\n      \"pmids\": [\"1382069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the labile repressor proteins not determined\",\n        \"Post-translational mechanisms of ELAM-1 surface downregulation (internalization/shedding) not addressed\"\n      ]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrating that E-selectin binding does not activate neutrophil integrins (no CD11b upregulation, no L-selectin shedding) established E-selectin as a pure tethering molecule that does not transduce outside-in activation signals to adherent leukocytes.\",\n      \"evidence\": \"Flow cytometry for multiple activation markers on PMNs adherent to E-selectin-transfected CHO cells and activated HUVEC\",\n      \"pmids\": [\"9218615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether E-selectin engagement triggers any intracellular signaling in leukocytes at all (e.g. calcium flux, kinase activation) not fully excluded\",\n        \"Role of E-selectin cytoplasmic domain signaling into endothelial cells not addressed\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovery of reverse signaling through membrane TNF-α inducing E-selectin on activated T cells expanded the expression repertoire beyond endothelial cells and introduced a non-classical induction mechanism.\",\n      \"evidence\": \"Anti-TNF-α antibody stimulation; RT-PCR; cleavage-resistant mutant membrane TNF-α transfection; HTLV-I-infected T cell lines\",\n      \"pmids\": [\"11123285\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional consequence of E-selectin on T cell surfaces not demonstrated\",\n        \"Not independently replicated by another group\",\n        \"Signaling pathway downstream of membrane TNF-α leading to NF-κB and SELE transcription in T cells not mapped\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic evidence from E-selectin-deficient mice proved that E-selectin-dependent migration is required for preferential accumulation of antigen-specific effector CD4 T cells at sites of antigen deposition in vivo.\",\n      \"evidence\": \"Whole-body tracking of antigen-specific T cells in CD62E-knockout versus wild-type recipient mice\",\n      \"pmids\": [\"12629067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative contribution of E-selectin versus P-selectin at antigen deposition sites not fully dissected\",\n        \"Whether E-selectin deficiency affects memory T cell generation long-term not tested\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of VEGF/VEGFR-2 as an NF-κB-dependent inducer of E-selectin on tumor endothelium linked angiogenic signaling to leukocyte/progenitor cell recruitment in the glioma microenvironment.\",\n      \"evidence\": \"NF-κB-dependent CD62E promoter reporter assays; anti-CD62E neutralizing antibodies reducing HPC homing to orthotopic gliomas in vivo\",\n      \"pmids\": [\"18689869\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Not independently replicated\",\n        \"Whether VEGF-induced E-selectin expression differs kinetically or quantitatively from cytokine-induced expression not resolved\",\n        \"Downstream signaling in HPCs upon E-selectin engagement not characterized\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of ITGA11 on cancer-associated fibroblasts as a binding partner for E-selectin on lymphatic endothelial cells, activating SRC-VEGFR3-MAPK signaling, revealed a non-classical role for E-selectin in tumor lymphangiogenesis beyond leukocyte adhesion.\",\n      \"evidence\": \"Single-cell RNA-seq, spatial transcriptomics, CAF-specific mouse model, Co-IP, pathway inhibition in bladder cancer\",\n      \"pmids\": [\"38428409\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"ITGA11-SELE interaction not independently replicated\",\n        \"Whether ITGA11 carries sialyl-Lewis X or binds E-selectin through a carbohydrate-independent mechanism not determined\",\n        \"Generalizability to other tumor types unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for E-selectin's dual sLex/sLea recognition at atomic resolution, the identity of labile repressor proteins governing its transient expression, the functional significance of E-selectin expression on non-endothelial cells, and the nature of the ITGA11 binding interface.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No co-crystal structure of E-selectin with physiological glycoprotein ligands\",\n        \"Functional role of E-selectin cytoplasmic domain signaling into endothelial cells remains uncharacterized\",\n        \"Whether ITGA11 interaction is lectin-domain-dependent or represents a distinct binding mode is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6, 9, 17]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11, 19]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 4, 5, 9, 16, 17]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 5, 6, 9, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SELPLG\",\n      \"SELL\",\n      \"ITGA11\",\n      \"TNFRSF1A\",\n      \"FUT3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"E-selectin (SELE/ELAM-1/CD62E) is a cytokine-inducible endothelial cell-surface C-type lectin that mediates calcium-dependent adhesion of leukocytes and tumor cells by recognizing sialyl-Lewis X and sialyl-Lewis A carbohydrate determinants displayed on glycoprotein ligands including PSGL-1, CD44, and ESL-1 [PMID:1701274, PMID:1714447, PMID:22021370]. Transcription is driven by NF-κB together with a second upstream cis-element in response to TNF, IL-1, and LPS, and is fine-tuned post-transcriptionally by labile-protein-dependent mRNA destabilization and TNF-induced miR-31 negative feedback [PMID:1713680, PMID:1710341, PMID:1382069, PMID:19949084]. Upon leukocyte engagement, E-selectin clusters at contact sites and its cytoplasmic domain links to an actin-associated complex containing α-actinin, vinculin, filamin, paxillin, and FAK, while ligand-specific outside-in signaling through PSGL-1 activates FGR/SYK to extend LFA-1 on rolling neutrophils, promoting slow rolling and downstream firm adhesion [PMID:8609175, PMID:20445017]. E-selectin directs skin-homing of CLA⁺ memory T cells and effector CD4⁺ T-cell accumulation at antigen sites, and on lymphatic endothelium engages ITGA11 on cancer-associated fibroblasts to activate SRC–p-VEGFR3–MAPK-driven lymphangiogenesis [PMID:1705666, PMID:12629067, PMID:38428409].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"The molecular identity of the cytokine-inducible endothelial leukocyte adhesion molecule was unknown; cloning of ELAM-1 revealed a mosaic protein with an N-terminal lectin domain, an EGF domain, and six complement regulatory repeats, and demonstrated that it directly mediates neutrophil adhesion.\",\n      \"evidence\": \"cDNA cloning by functional expression selection in COS cells with adhesion assay validation\",\n      \"pmids\": [\"2466335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Carbohydrate ligand identity unknown\", \"Transcriptional regulation mechanism undefined\", \"In vivo role not tested\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"The nature of the E-selectin ligand was resolved as the tetrasaccharide sialyl-Lewis X (and subsequently sialyl-Lewis A), with α(1,3)-fucosyltransferase expression being necessary and sufficient to generate the ligand on non-myeloid cells, establishing E-selectin as a carbohydrate-binding lectin.\",\n      \"evidence\": \"Purified carbohydrate inhibition assays, fucosyltransferase cDNA transfection conferring binding in non-binding cells\",\n      \"pmids\": [\"1701274\", \"1701275\", \"1699667\", \"1702034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific glycoprotein carriers on leukocytes not identified\", \"Three-dimensional structure of the lectin domain not determined\", \"Relative contribution of glycolipid vs glycoprotein ligands unclear\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"The transcriptional mechanism driving cytokine-inducible ELAM-1 expression was shown to require NF-κB activation in a PKC-independent manner, with a second upstream cis-element also necessary, and labile repressor proteins controlling both mRNA stability and NF-κB activity in resting cells.\",\n      \"evidence\": \"Nuclear run-on assays, gel mobility shift assays, PKC inhibitor studies, promoter deletion reporters, protein synthesis inhibitor superinduction experiments\",\n      \"pmids\": [\"1713680\", \"1710341\", \"1382069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the second cis-element transcription factor not determined\", \"Nature of the labile repressor protein not identified\", \"Post-transcriptional regulation by non-coding RNA not yet explored\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"E-selectin was found to selectively bind memory (CD45RO⁺) but not naive T cells, and specifically the CLA⁺ skin-homing subset, with preferential vascular expression at cutaneous inflammatory sites — establishing E-selectin as a tissue-selective vascular addressin for skin immune surveillance.\",\n      \"evidence\": \"Adhesion assays with purified T-cell subsets, ELAM-1-transfected COS cells, immunohistology of cutaneous vs non-cutaneous tissues\",\n      \"pmids\": [\"1705666\", \"1705667\", \"1710227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for CLA⁺ T-cell selectivity not defined\", \"In vivo requirement not tested in genetic models\", \"Ligand identity on memory T cells not determined\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"The intracellular fate of E-selectin after surface expression was defined: internalized E-selectin routes exclusively to endosomes and lysosomes for degradation (not recycled), and cytoplasmic domain deletion abolishes internalization, revealing tail-dependent trafficking.\",\n      \"evidence\": \"Immunofluorescent antibody tracking, subcellular fractionation, cytoplasmic domain deletion mutants in AtT-20 cells\",\n      \"pmids\": [\"7694691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific cytoplasmic tail sorting motifs not mapped\", \"Ubiquitination or other post-translational signals for lysosomal targeting not investigated\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"The atomic structure of the E-selectin lectin/EGF domain was solved at 2.0 Å, revealing the Ca²⁺ coordination geometry and specific residues for carbohydrate contact, confirmed by mutagenesis — providing the structural basis for selectin-ligand recognition.\",\n      \"evidence\": \"X-ray crystallography at 2.0 Å resolution with site-directed mutagenesis and binding assays\",\n      \"pmids\": [\"7509040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-crystal with sLex/sLea ligand not obtained\", \"Structural basis for selectivity among selectin family members not resolved\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"E-selectin was shown to couple leukocyte binding to cytoskeletal remodeling: upon engagement it clusters at contact sites and its cytoplasmic domain recruits α-actinin, vinculin, filamin, paxillin, and FAK, while PSGL-1 was identified as an E-selectin ligand whose binding requires core 2 O-glycans but not tyrosine sulfation.\",\n      \"evidence\": \"Confocal microscopy, cytoskeletal fractionation, magnetic twisting cytometry, tailless mutant; CHO cell reconstitution with glycosyltransferases and tyrosine mutagenesis\",\n      \"pmids\": [\"8609175\", \"8621728\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding partners within the cytoplasmic tail complex not mapped by domain interaction\", \"Signaling consequences of cytoskeletal coupling in endothelial cells not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"CD44 bearing sialylated, fucosylated N-glycans was identified as an additional E-selectin ligand on hematopoietic progenitor cells, mediating rolling under physiological shear over a wider range than PSGL-1, broadening the repertoire of E-selectin counter-receptors.\",\n      \"evidence\": \"Shear-based rolling assay on E-selectin-expressing bone marrow endothelium, selectin-Ig fusion protein binding, neutralizing antibodies\",\n      \"pmids\": [\"11402070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative in vivo contribution of CD44 vs PSGL-1 on HPCs not established genetically\", \"Specific N-glycan structures on CD44 mediating binding not characterized\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic knockout of E-selectin in mice demonstrated its in vivo requirement for accumulation of antigen-specific effector CD4⁺ T cells at peripheral antigen injection sites, establishing the physiological non-redundant role of E-selectin in effector T-cell trafficking.\",\n      \"evidence\": \"Adoptive transfer of antigen-specific CD4 T cells into E-selectin-deficient mice with whole-body tracking\",\n      \"pmids\": [\"12629067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether P-selectin provides partial compensation in vivo not fully resolved\", \"Tissue-specific requirements beyond skin not systematically addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"A post-transcriptional negative feedback loop was identified: TNF induces miR-31 which targets the E-selectin 3′ UTR, dampening E-selectin expression and neutrophil adhesion — adding a miRNA layer to the transcriptional regulation already known.\",\n      \"evidence\": \"miR-31 mimic and antagonist transfection in endothelial cells with neutrophil adhesion functional readout\",\n      \"pmids\": [\"19949084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative quantitative contribution of miR-31 vs mRNA instability in vivo not determined\", \"Whether other miRNAs (miR-17-3p) act cooperatively not fully dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The signaling cascade triggered by E-selectin engagement on rolling neutrophils was dissected: PSGL-1 ligation activates SYK and FGR (Src family kinase), which via PLC and p38 MAPK extend LFA-1 to an intermediate conformation enabling slow rolling — linking selectin-mediated tethering to integrin activation.\",\n      \"evidence\": \"Flow-based rolling assay on immobilized E-selectin, conformation-specific integrin reporter antibodies, kinase inhibitors, PSGL-1 blocking\",\n      \"pmids\": [\"20445017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ESL-1 and CD44 activate distinct downstream kinases not fully mapped in same system\", \"Structural basis for PSGL-1 transmembrane signal initiation unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"An unexpected non-immune role emerged: E-selectin on lymphatic endothelial cells engages ITGA11 on cancer-associated fibroblasts, activating SRC–p-VEGFR3–MAPK to drive lymphangiogenesis and lymph node metastasis in bladder cancer.\",\n      \"evidence\": \"Single-cell RNA-seq, spatial transcriptomics, ITGA11-deficient mouse model, multicenter clinical cohort\",\n      \"pmids\": [\"38428409\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether E-selectin–ITGA11 interaction is direct or requires carbohydrate ligands not confirmed\", \"Generalizability to other tumor types not established\", \"Independent replication needed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key mechanistic questions remain: the identity of the second cis-element transcription factor cooperating with NF-κB, the structural basis of E-selectin–ligand selectivity from co-crystal structures with sLex/sLea, and whether the lymphangiogenesis-promoting role via ITGA11 represents a general E-selectin function beyond bladder cancer.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal structure with carbohydrate ligand\", \"Second transcription factor for promoter induction unidentified\", \"E-selectin function in lymphangiogenesis requires independent validation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 11, 12, 21, 26]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 19, 32]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 11, 12, 23, 25, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 25, 28, 31]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 1, 19, 21, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SELPLG\",\n      \"CD44\",\n      \"ACTN1\",\n      \"VCL\",\n      \"FLNA\",\n      \"PXN\",\n      \"PTK2\",\n      \"ITGA11\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}