{"gene":"ITGAX","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1987,"finding":"ITGAX (CD11c/p150,95) encodes the alpha subunit of a leukocyte adhesion glycoprotein. cDNA cloning revealed a 1081-aa extracellular domain with three tandem homologous repeats containing putative divalent cation-binding sites, a 26-aa transmembrane domain, and a 29-residue cytoplasmic tail, establishing it as a member of the integrin superfamily (alpha/beta heterodimer with the shared beta2/CD18 subunit).","method":"cDNA cloning, peptide sequencing, sequence analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — original molecular cloning with full structural characterization, foundational paper","pmids":["3327687"],"is_preprint":false},{"year":1985,"finding":"p150,95 (CD11c/CD18) was identified as an iC3b-binding protein. It was co-purified with complement receptor 3 (CR3) on iC3b-Sepharose affinity columns and co-immunodepleted with anti-CR3 beta-subunit antibody, demonstrating that p150,95 functions as a complement fragment iC3b receptor.","method":"Affinity chromatography (iC3b-Sepharose), immunodepletion","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — direct biochemical purification with affinity chromatography, foundational discovery","pmids":["4062888"],"is_preprint":false},{"year":1994,"finding":"The I domain of the CD11c (alphaX) subunit was identified as the major ligand recognition site for iC3b. Cells co-transfected with human p150,95 alpha and chicken (but not human) beta2 subunit bound iC3b-sensitized erythrocytes, and binding was abolished by I-domain-specific monoclonal antibodies, demonstrating that the I domain mediates iC3b recognition and that alpha/beta subunit interactions regulate p150,95 adhesiveness.","method":"Heterologous transfection (human alphaX + chicken or human beta2), cell adhesion assay, mAb blocking","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in transfected cells with domain-specific antibody blocking, multiple orthogonal approaches","pmids":["7512600"],"is_preprint":false},{"year":1988,"finding":"The genes encoding the alpha subunits of Mac-1, LFA-1, and p150,95 (ITGAX) were mapped to chromosome 16p11-p13.1 by Southern blot analysis of somatic cell hybrids and chromosomal in situ hybridization, defining a leukocyte integrin alpha-subunit gene cluster.","method":"Southern blot, somatic cell hybrid analysis, chromosomal in situ hybridization","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — direct genomic mapping with multiple methods","pmids":["3284962"],"is_preprint":false},{"year":1995,"finding":"CD11c/CD18 (alphaX beta2) functions as a transmembrane signaling receptor for LPS. CHO cells transfected with CD11c/CD18 (but not untransfected CHO cells) acquired serum-independent NF-kappaB activation in response to Gram-negative bacteria and LPS, demonstrating CD11c/CD18 is sufficient to initiate LPS-dependent intracellular signaling independently of CD14.","method":"Heterologous expression in CHO cells, NF-kappaB translocation assay, antibody blocking","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in heterologous cells with defined readout, compared to CD14-transfected controls","pmids":["7535339"],"is_preprint":false},{"year":1995,"finding":"CD23 (the low-affinity IgE receptor) was identified as a novel ligand for the CD11c and CD11b alpha chains. Recombinant CD23 in fluorescent liposomes bound COS cells transfected with CD11c/CD18 or CD11b/CD18 but not CD11a/CD18. Triggering CD11c on monocytes with recombinant CD23 or anti-CD11c antibodies induced nitrite production and pro-inflammatory cytokines (IL-1beta, IL-6, TNF-alpha), establishing CD23–CD11c/CD18 as a functional monocyte activation axis.","method":"Transfection of COS cells, fluorescent liposome binding assay, antibody blocking, functional cytokine assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 — binding confirmed with transfected cells plus multiple functional readouts","pmids":["7621072"],"is_preprint":false},{"year":1996,"finding":"AP-1 transcription factor complex (c-Fos/c-Jun) regulates both basal and differentiation-induced transcription of the CD11c leukocyte integrin gene. Footprinting, mobility shift, in vivo footprinting, co-transfection, and site-directed mutagenesis of the proximal promoter identified a functional AP-1 site at position -60 (AP1-60) as essential for CD11c promoter activity in myeloid and B cells, and for PMA-induced upregulation during U937 differentiation.","method":"DNase I footprinting, EMSA, in vivo footprinting, co-transfection with c-fos/c-jun expression constructs, site-directed mutagenesis, CAT reporter assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including mutagenesis confirming functional AP-1 site","pmids":["8621914"],"is_preprint":false},{"year":1996,"finding":"Dithiocarbamate antioxidants (DTCs) induce CD11c expression in myeloid cells via AP-1. PDTC increased CD11c mRNA and promoter activity in U937 promonocytic cells. Transfections with promoter-deletion constructs localized a DTC-responsive region to -160 to +40; gel shift assays showed PDTC-induced Fos/Jun complexes binding to an AP-1 site at -60; in vitro mutagenesis confirmed its functional importance.","method":"Reporter gene transfection, EMSA, in vitro mutagenesis, RT-PCR","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis plus multiple reporter and binding assays","pmids":["8631910"],"is_preprint":false},{"year":1996,"finding":"A second Ets-binding site (Ets C, at -42 to -34) cooperates with AP-1 sites to regulate CD11c expression in response to phorbol ester (PMA). Deletion of Ets C significantly reduced PMA-induced CD11c promoter activity, while deletion of Ets A (-13 to -5) had only modest effects. Five footprinted protein-binding sites were defined in the -86 to +40 proximal promoter region.","method":"DNase I footprinting, EMSA with purified c-Jun, co-transfection, CAT reporter assay, promoter deletion analysis","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1 — promoter deletion and binding assays defining multiple cis-regulatory elements","pmids":["8649434"],"is_preprint":false},{"year":2001,"finding":"Recognition of fibrinogen by alphaX beta2 (CD11c/CD18) is mediated through the gamma C domain (gamma 143-411) of fibrinogen, specifically sequences gamma 190-202 (P1) and gamma 377-395 (P2). Synthetic peptides duplicating these sequences and neutrophil inhibitory factor (NIF) inhibited alphaX beta2-mediated cell adhesion to fibrinogen D fragment, demonstrating shared structural requirements with alphaM beta2 for fibrinogen gamma C recognition.","method":"Cell adhesion assay, inhibition with synthetic peptides and NIF, recombinant gamma-module binding","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2 — direct cell adhesion with peptide inhibition, single lab but multiple inhibitory approaches","pmids":["11460493"],"is_preprint":false},{"year":2002,"finding":"JAM-3 (junctional adhesion molecule 3) on human platelets is a counterreceptor for p150,95 (alphaX beta2, CD11c/CD18). Myelomonocytic cells adhered to immobilized JAM-3 or JAM-3-transfected cells; this heterophilic interaction was attributed to direct interaction of JAM-3 with CD11c/CD18 (and to a lesser extent with CD11b/CD18), as demonstrated by K562 cells transfected with distinct beta2-integrin heterodimers and purified protein studies.","method":"Cell adhesion assay, transfected K562 cells expressing specific beta2-integrin heterodimers, purified protein binding","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 — purified protein and transfection reconstitution, multiple cell-based assays","pmids":["12208882"],"is_preprint":false},{"year":2006,"finding":"Activation of leukocyte integrin alphaX beta2 (CD11c/CD18) requires conversion from a bent to an extended conformation. Negative-stain electron microscopy showed that alphaX beta2 transitions between a bent and two extended conformations (closed and open headpiece). A transmembrane clasp strongly stabilized the bent conformation for alphaX beta2. Both conformational extension and headpiece opening are required for integrin activation and ligand binding.","method":"Negative stain electron microscopy, engineered clasp mutants, Fab-based conformational reporter assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 — structural EM combined with functional mutant and Fab studies","pmids":["17045822"],"is_preprint":false},{"year":2007,"finding":"The alphaX I domain of CD11c/CD18 binds heparin in a conformation- and Mg2+-dependent manner. Heparin oligomers of ≥10 saccharide residues inhibit alphaX I domain binding to iC3b; fully sulfated 12-saccharide heparin had 1.3 µM affinity for the alphaX I domain. Fully sulfated heparin induced conformational change in the alphaX beta2 ectodomain, demonstrating allosteric linkage between heparin binding and integrin conformation.","method":"Binding inhibition assay (iC3b competition), direct binding to immobilized heparin, conformational change assay, synthetic heparinoid analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple in vitro binding assays with defined oligomers and conformational readout","pmids":["17699512"],"is_preprint":false},{"year":2007,"finding":"CD11c/CD18 recognizes ICAM-2 and VCAM-1 as novel ligands. Cell adhesion assays demonstrated CD11c-mediated adhesion to ICAM-2 and VCAM-1, with the CD11c-binding site on VCAM-1 distinct from that used by alpha4 integrin. CD11c and alpha4 beta1 cooperated in monocyte capture and transmigration on inflamed human aortic endothelial cells. The N418 anti-mouse CD11c mAb blocked CD11c binding to iC3b, ICAM-1, and VCAM-1. In vivo, N418 treatment significantly reduced SRBC-induced delayed-type hypersensitivity, predominantly affecting the sensitization phase.","method":"Cell adhesion quantification assay, monocyte transmigration assay on inflamed endothelium, in vivo DTH model with antibody blockade","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 — in vitro binding and transmigration assays replicated in vivo with blocking antibody","pmids":["17389580"],"is_preprint":false},{"year":2009,"finding":"The crystal structure of alphaX beta2 (complement receptor type 4) was solved. The alphaI domain is highly flexible relative to the beta-propeller domain, allowing two betaI domain conformational states to couple to three alphaI domain states. The alpha- and beta-legs are oriented differently from alphaI-less integrins. Activating mutations and antibody epitope positions support that extension and headpiece opening (not a deadbolt mechanism) drive integrin activation.","method":"X-ray crystallography (10 molecules in crystal lattices), structural analysis, mutant mapping","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with multiple molecules and functional mutant mapping","pmids":["20033057"],"is_preprint":false},{"year":2009,"finding":"CD11c deficiency in mice decreased firm arrest of monocytes on VCAM-1 and E-selectin under shear flow, reduced monocyte/macrophage accumulation in atherosclerotic lesions, and decreased atherosclerosis in apoE-/- mice on a high-fat diet. CD11c expression on blood monocytes increased during hypercholesterolemia. This establishes CD11c as a mediator of monocyte adhesion to the endothelium and atherosclerosis development.","method":"CD11c knockout mouse generation, shear flow adhesion assay (VCAM-1 and E-selectin substrates), flow cytometry, atherosclerosis quantification","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with in vitro functional assay and in vivo atherosclerosis model","pmids":["19433759"],"is_preprint":false},{"year":2009,"finding":"CD11c deficiency in obese mice did not alter weight gain but decreased adipose tissue inflammation (reduced T-cell numbers, MHC class II, CCL2, CCL5, CCL4, and IFN-gamma) and ameliorated insulin resistance and glucose intolerance. This establishes CD11c as a contributor to T-cell accumulation and activation in adipose tissue, linking it mechanistically to obesity-associated insulin resistance.","method":"CD11c knockout mouse on high-fat diet, flow cytometry, RNase protection assay, qPCR, ELISA, insulin and glucose tolerance tests","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple functional metabolic and immune readouts","pmids":["19910635"],"is_preprint":false},{"year":2010,"finding":"Activation of alphaX beta2 requires both integrin extension and open headpiece conformation. Negative stain EM and adhesion assays showed that the extended-open headpiece conformation has high affinity for ligand, whereas both the bent conformation and the extended-closed headpiece conformation are low-affinity states. Two activating Fabs stabilized the open headpiece; two inhibitory Fabs stabilized the closed headpiece.","method":"Negative stain electron microscopy, Fab conformational reporters and activators/inhibitors, cell adhesion assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — EM structural data combined with multiple functional Fab perturbation and adhesion assays","pmids":["20679211"],"is_preprint":false},{"year":2010,"finding":"CD11c/CD18 expression is upregulated on blood monocytes during hypertriglyceridemia via internalization of triglyceride-rich lipoproteins through LDL-receptor-related protein-1 (LRP-1). Elevated CD11c correlated with increased monocyte arrest on VCAM-1 under shear flow; CD11c levels fell as blood triglycerides normalized. This establishes a mechanistic link between postprandial lipid uptake, CD11c upregulation, and enhanced monocyte adhesion to the endothelium.","method":"Flow cytometry, laboratory-on-a-chip shear flow assay on VCAM-1, lipoprotein internalization assay with LRP-1 blocking","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — mechanistic connection from lipid uptake to receptor upregulation to functional adhesion confirmed in vitro and in human subjects","pmids":["21030716"],"is_preprint":false},{"year":2016,"finding":"CD11c/CD18 dominates adhesion of human monocytes, macrophages, and dendritic cells to fibrinogen over CD11b/CD18. Using a bead-based quantification of receptor numbers and biophysical adhesion assays, CD11c was shown to be the primary adhesion mediator to fibrinogen on MDDCs and MDMs. Blocking CD11b significantly enhanced MDDC and MDM attachment, revealing competitive inhibition between CD11b and CD11c for fibrinogen binding.","method":"Bead-based receptor quantification, biophysical cell adhesion assays, antibody-blocking experiments on monocytes/MDMs/MDDCs","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative biophysical approach with functional blocking, single study","pmids":["27658051"],"is_preprint":false},{"year":2018,"finding":"Stearic acid (SA), a saturated fatty acid, induces CD11c expression in monocytes/macrophages through epidermal fatty acid binding protein (E-FABP)-mediated activation of the nuclear retinoic acid receptor. E-FABP depletion inhibited SA-induced CD11c upregulation in vitro and abrogated high-saturated-fat diet-induced inflammatory skin lesions in obese mice, establishing E-FABP/retinoic acid receptor as the intracellular pathway linking saturated fatty acids to CD11c expression.","method":"In vitro monocyte culture with fatty acids, E-FABP knockdown, reporter assays, in vivo dietary model in E-FABP-deficient mice","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic loss-of-function in vitro and in vivo with defined molecular pathway","pmids":["29626089"],"is_preprint":false},{"year":2019,"finding":"TRPV4 is functionally expressed in the plasma membrane of immature CD11c+ bone-marrow-derived dendritic cells and its activity and expression are downregulated upon LPS-induced maturation. TRPV4-deficient CD11c+ BMDCs show a significantly reduced capacity for Fc receptor-mediated phagocytosis (IgG-coated beads) but not for non-opsonized phagocytosis, establishing a role for TRPV4-mediated Ca2+ entry in the Fc receptor phagocytosis pathway of CD11c+ DCs.","method":"Intracellular Ca2+ imaging, Trpv4 knockout BMDCs, phagocytosis assay (IgG-coated vs. uncoated beads), NF-kappaB translocation, cytokine assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with specific functional readout distinguishing Fc-dependent vs. independent phagocytosis","pmids":["31295806"],"is_preprint":false},{"year":2020,"finding":"CD11c is expressed on short-term hematopoietic stem cells and multipotent progenitor cells (HSPCs). CD11c deficiency does not affect steady-state HSPC numbers but leads to increased apoptosis and significant HSPC loss during sepsis and bone marrow transplantation, demonstrating a distinct, non-redundant role for CD11c in HSPC survival under stress conditions.","method":"CD11c knockout mouse, flow cytometry of bone marrow compartments, sepsis model, BMT model, apoptosis assays","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with two stress models and defined apoptosis phenotype","pmids":["33351105"],"is_preprint":false},{"year":2023,"finding":"CD11c regulates neutrophil maturation in the bone marrow. CD11c-deficient mice show impaired neutrophil maturation with increased preneutrophil proliferation and apoptosis and reduced effector functions. Under LPS-induced emergency granulopoiesis, CD11c deficiency exaggerated immature neutrophil release. Conversely, constitutively active CD11c knock-in mice displayed accelerated neutrophil maturation, enhanced effector functions, and improved bacterial clearance.","method":"CD11c knockout and constitutively active CD11c knock-in mice, flow cytometry of bone marrow maturation stages, LPS challenge, bacterial clearance assay","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 2 — bidirectional genetic perturbation (KO + gain-of-function knock-in) with consistent phenotype and functional readouts","pmids":["36306384"],"is_preprint":false}],"current_model":"ITGAX (CD11c/p150,95) encodes the alpha subunit of the leukocyte beta2-integrin alphaXbeta2 (CD11c/CD18), which exists in bent (inactive) and extended open-headpiece (active, high-affinity) conformations; the alphaX I domain mediates recognition of multiple ligands including iC3b, fibrinogen gamma-C domain (P1/P2 sequences), heparin, ICAM-1, ICAM-2, VCAM-1, JAM-3, LPS, and CD23; its promoter is transcriptionally driven by AP-1 (c-Fos/c-Jun) and Ets factors; beyond its classical adhesion and phagocytic receptor role on dendritic cells and macrophages, CD11c regulates neutrophil maturation in the bone marrow, supports hematopoietic stem/progenitor cell survival under stress, and mediates monocyte arrest on endothelium during hyperlipidemia via LRP-1-dependent lipid uptake and E-FABP/retinoic acid receptor-mediated transcriptional upregulation."},"narrative":{"teleology":[{"year":1985,"claim":"Establishing that p150,95 (later CD11c/CD18) is an iC3b receptor resolved the identity of the third complement-binding leukocyte surface glycoprotein and positioned it alongside CR3 as a phagocytic complement receptor.","evidence":"Affinity chromatography on iC3b-Sepharose and immunodepletion with anti-β2 antibody","pmids":["4062888"],"confidence":"High","gaps":["Binding site on the α-subunit not yet mapped","Functional distinction from CR3 in phagocytosis unclear"]},{"year":1987,"claim":"Cloning of the ITGAX cDNA revealed that CD11c is an integrin α-subunit with divalent cation-binding repeats and a short cytoplasmic tail, establishing its molecular architecture and membership in the β2-integrin family.","evidence":"cDNA cloning with peptide sequencing and sequence analysis","pmids":["3327687"],"confidence":"High","gaps":["Three-dimensional structure unknown","Signaling domains in cytoplasmic tail uncharacterized"]},{"year":1994,"claim":"Demonstrating that the αX I domain mediates iC3b recognition resolved the ligand-binding domain within CD11c and showed that α/β subunit pairing regulates adhesiveness.","evidence":"Heterologous transfection of human αX with chicken vs. human β2, mAb blocking of the I domain","pmids":["7512600"],"confidence":"High","gaps":["Atomic-level I domain–iC3b interface undetermined","Mechanism of β-subunit regulation of I-domain conformation unclear"]},{"year":1995,"claim":"Identification of LPS and CD23 as ligands expanded CD11c beyond a complement receptor to a transmembrane innate-immune signaling receptor capable of NF-κB activation and pro-inflammatory cytokine production independently of CD14.","evidence":"CHO and COS cell reconstitution with defined integrin heterodimers, NF-κB translocation, cytokine and nitrite assays","pmids":["7535339","7621072"],"confidence":"High","gaps":["Downstream signaling intermediates between CD11c and NF-κB unknown","In vivo relevance of CD23–CD11c axis not tested"]},{"year":1996,"claim":"Mapping functional AP-1 and Ets cis-regulatory elements in the proximal CD11c promoter revealed the transcription factor network controlling basal and differentiation-induced ITGAX expression in myeloid cells.","evidence":"DNase I footprinting, EMSA, in vivo footprinting, site-directed mutagenesis, CAT reporter assays in U937 and B cells","pmids":["8621914","8631910","8649434"],"confidence":"High","gaps":["Chromatin-level regulation and distal enhancers uncharacterized","Lineage-specific silencing mechanisms unknown"]},{"year":2001,"claim":"Mapping fibrinogen recognition to γC-domain peptides P1 and P2 defined the molecular determinants of CD11c-fibrinogen interaction and showed shared structural requirements with αMβ2.","evidence":"Cell adhesion assays with synthetic γC-domain peptides and NIF inhibition","pmids":["11460493"],"confidence":"Medium","gaps":["Single-lab observation; crystal structure of I domain–fibrinogen complex lacking","Relative contribution of CD11c vs. CD11b to fibrinogen binding in vivo unclear"]},{"year":2006,"claim":"Electron microscopy of αXβ2 directly visualized the bent-to-extended conformational switch and demonstrated that both extension and headpiece opening are required for activation, resolving the structural mechanism of integrin inside-out signaling.","evidence":"Negative-stain EM with engineered transmembrane clasps and Fab conformational reporters","pmids":["17045822"],"confidence":"High","gaps":["High-resolution cryo-EM of the fully open ligand-bound state not yet obtained","Intracellular signals triggering conformational switch not identified"]},{"year":2007,"claim":"Discovery of heparin, ICAM-2, and VCAM-1 as additional I-domain ligands, with in vivo blocking reducing delayed-type hypersensitivity, established CD11c as a multi-ligand adhesion receptor involved in leukocyte trafficking beyond complement-opsonized targets.","evidence":"Cell adhesion assays, monocyte transmigration on inflamed endothelium, heparin oligomer competition, in vivo DTH model with anti-CD11c antibody","pmids":["17699512","17389580"],"confidence":"High","gaps":["Structural basis for ligand selectivity among I-domain ligands not defined","Relative hierarchy of ligand engagement in vivo unclear"]},{"year":2009,"claim":"The crystal structure of αXβ2 revealed high flexibility of the αI domain relative to the β-propeller and defined how two βI-domain states couple to three αI-domain conformations, providing a structural framework for understanding integrin activation without a deadbolt mechanism.","evidence":"X-ray crystallography of 10 molecules in lattices with activating mutant mapping","pmids":["20033057"],"confidence":"High","gaps":["Full ectodomain structure in fully active, ligand-bound state not captured","Membrane-proximal and transmembrane regions absent from the crystal"]},{"year":2009,"claim":"Genetic deletion of CD11c in apoE−/− mice reduced monocyte arrest on VCAM-1 under flow and decreased atherosclerotic lesion size, establishing CD11c as a non-redundant mediator of monocyte recruitment to the arterial wall during hypercholesterolemia.","evidence":"CD11c KO mice, shear-flow adhesion assay, atherosclerosis quantification in high-fat diet model","pmids":["19433759"],"confidence":"High","gaps":["Cell-type-specific contributions (monocyte vs. DC vs. macrophage) not dissected","Downstream intracellular signaling in atherogenesis not defined"]},{"year":2009,"claim":"CD11c deficiency ameliorated obesity-induced adipose tissue inflammation and insulin resistance, revealing a role for CD11c in T-cell accumulation and inflammatory polarization in metabolic disease.","evidence":"CD11c KO mice on high-fat diet with metabolic phenotyping, flow cytometry, cytokine profiling","pmids":["19910635"],"confidence":"High","gaps":["Whether CD11c acts on macrophages, DCs, or both in adipose tissue not resolved","Direct ligand interaction in adipose tissue not identified"]},{"year":2010,"claim":"Linking postprandial triglyceride-rich lipoprotein internalization via LRP-1 to CD11c surface upregulation and enhanced monocyte adhesion provided a molecular mechanism connecting dietary lipid metabolism to vascular inflammation.","evidence":"Flow cytometry on human monocytes, shear-flow adhesion assay, LRP-1 blocking in vitro and triglyceride normalization in vivo","pmids":["21030716"],"confidence":"High","gaps":["Intracellular trafficking route from LRP-1 to CD11c surface expression not defined","Whether lipid cargo directly affects CD11c transcription or recycling unknown"]},{"year":2018,"claim":"Identification of the E-FABP/retinoic acid receptor axis as the intracellular pathway linking stearic acid to CD11c upregulation connected saturated fatty acid sensing to integrin-mediated inflammation in obesity.","evidence":"E-FABP knockdown/knockout in vitro and dietary model in E-FABP-deficient mice, reporter assays","pmids":["29626089"],"confidence":"Medium","gaps":["Whether this pathway operates in human monocytes in vivo is untested","Interaction with the AP-1 transcriptional program not examined"]},{"year":2020,"claim":"Demonstrating that CD11c is expressed on HSPCs and is required for their survival during sepsis and transplantation extended CD11c function beyond mature leukocyte adhesion to hematopoietic stress resilience.","evidence":"CD11c KO mice, sepsis and bone marrow transplant models, apoptosis assays by flow cytometry","pmids":["33351105"],"confidence":"Medium","gaps":["Ligand or signaling pathway mediating HSPC survival unknown","Whether this is cell-autonomous or niche-dependent is not resolved"]},{"year":2023,"claim":"Bidirectional genetic perturbation (KO and constitutively active knock-in) showed that CD11c controls neutrophil maturation in the bone marrow, with loss causing maturation arrest and gain-of-function accelerating maturation and bacterial clearance, establishing a previously unrecognized developmental role.","evidence":"CD11c KO and constitutively active knock-in mice, bone marrow maturation staging, LPS-induced granulopoiesis, bacterial clearance assay","pmids":["36306384"],"confidence":"High","gaps":["Signaling downstream of CD11c that drives maturation checkpoints not defined","Identity of the bone marrow niche ligand engaging CD11c on preneutrophils unknown"]},{"year":null,"claim":"The intracellular signaling cascades downstream of CD11c engagement — particularly those mediating HSPC survival, neutrophil maturation, and NF-κB activation — remain largely undefined, and the bone marrow niche ligands engaging CD11c on progenitor cells have not been identified.","evidence":"","pmids":[],"confidence":"High","gaps":["No adapter or kinase cascade mapped downstream of the CD11c cytoplasmic tail","Bone marrow niche counter-receptor for CD11c on HSPCs/preneutrophils unidentified","High-resolution cryo-EM structure of fully ligand-engaged αXβ2 lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,2,9,10,11,12,13,17,19]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,5]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,5,11,17,18]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2,4,5,13,15,16,21,23]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[10,13,15,18]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[9,10,19]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[22,23]}],"complexes":["αXβ2 integrin (CD11c/CD18)"],"partners":["ITGB2","ICAM1","ICAM2","VCAM1","JAM3","FCER2","LRP1","FABP5"],"other_free_text":[]},"mechanistic_narrative":"ITGAX (CD11c) encodes the alpha-X subunit of the leukocyte β2-integrin αXβ2 (CD11c/CD18), a multiligand adhesion and signaling receptor expressed predominantly on dendritic cells, macrophages, monocytes, and neutrophils that functions in complement-mediated phagocytosis, leukocyte trafficking, and innate immune activation. The αX I domain mediates recognition of iC3b, fibrinogen γC-domain, heparin, ICAM-1, ICAM-2, VCAM-1, JAM-3, LPS, and CD23, with ligand binding requiring transition from a bent, low-affinity conformation to an extended, open-headpiece high-affinity state as demonstrated by electron microscopy and X-ray crystallography [PMID:17045822, PMID:20033057, PMID:20679211]. Beyond classical adhesion, CD11c drives monocyte arrest on inflamed endothelium during hyperlipidemia via LRP-1-dependent lipoprotein uptake and E-FABP/retinoic acid receptor–mediated transcriptional upregulation, contributing to atherosclerosis and obesity-associated insulin resistance [PMID:19433759, PMID:21030716, PMID:29626089, PMID:19910635]. CD11c also has non-redundant roles in neutrophil maturation in the bone marrow and in hematopoietic stem/progenitor cell survival under stress, as shown by bidirectional genetic perturbation in mice [PMID:36306384, PMID:33351105]."},"prefetch_data":{"uniprot":{"accession":"P20702","full_name":"Integrin alpha-X","aliases":["CD11 antigen-like family member C","Leu M5","Leukocyte adhesion glycoprotein p150,95 alpha chain","Leukocyte adhesion receptor p150,95"],"length_aa":1163,"mass_kda":127.8,"function":"Integrin alpha-X/beta-2 is a receptor for fibrinogen. It recognizes the sequence G-P-R in fibrinogen. It mediates cell-cell interaction during inflammatory responses. It is especially important in monocyte adhesion and chemotaxis. 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an Ets binding site at -42 to -34 (Ets C) is functionally important for phorbol ester-induced CD11c expression in myeloid cells.\",\n      \"method\": \"DNase I footprinting, mobility shift assays, deletion analysis of CD11c promoter-CAT reporters, transfection into HL60 cells\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple promoter deletion constructs and EMSA in single study\",\n      \"pmids\": [\"8649434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The alphaX I domain of CD11c/CD18 binds heparin in a conformationally regulated, Mg2+-dependent manner; heparin oligomers ≥10 saccharides inhibit iC3b binding to the alphaX I domain, and fully sulfated 12-mer heparin fragments induce allosteric conformational changes in the full ectodomain of alphaXbeta2.\",\n      \"method\": \"In vitro binding assays with alphaX I domain and immobilized heparin, competitive inhibition of iC3b binding, conformational studies of ectodomain\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro biochemical reconstitution with structural and allosteric readouts\",\n      \"pmids\": [\"17699512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CD11c/CD18 binds ICAM-2 and VCAM-1 as novel ligands, and contributes to monocyte firm arrest and transmigration on inflamed human aortic endothelial cells; the anti-mouse CD11c mAb N418 blocks CD11c binding to iC3b, ICAM-1, and VCAM-1. In vivo treatment with N418 reduced SRBC-induced delayed-type hypersensitivity, implicating CD11c in leukocyte recruitment and antigen uptake.\",\n      \"method\": \"Cell adhesion assays, transmigration assay on human aortic endothelial cells under shear flow, antibody blocking, in vivo DTH model\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal assays including cell adhesion, transmigration, and in vivo functional blockade\",\n      \"pmids\": [\"17389580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CD11c on blood monocytes is upregulated during hypercholesterolemia; CD11c deficiency in apoE-/- mice decreases firm arrest of monocytes on VCAM-1 and E-selectin under shear flow, reduces monocyte/macrophage accumulation in atherosclerotic lesions, and decreases atherosclerosis development, establishing a role for CD11c in monocyte recruitment during atherogenesis.\",\n      \"method\": \"CD11c knockout mouse generation, flow cytometry, shear flow adhesion assay on VCAM-1/E-selectin, histological quantification of atherosclerotic lesions in apoE-/- background\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple mechanistic readouts (adhesion assay, lesion quantification)\",\n      \"pmids\": [\"19433759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CD11c/CD18 dominates adhesion of human monocytes, macrophages, and dendritic cells to fibrinogen over CD11b/CD18; blocking CD11b significantly enhances CD11c-mediated attachment, demonstrating competitive binding between the two integrins for fibrinogen.\",\n      \"method\": \"Bead-based quantification of receptor numbers, biophysical cell adhesion assays, antibody blocking of CD11b and CD11c on primary human monocytes, macrophages, and dendritic cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — quantitative biophysical measurements with receptor counting and functional adhesion assays\",\n      \"pmids\": [\"27658051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD11c-targeted delivery of double-stranded DNA to human dendritic cells via anti-CD11c antibody conjugate leads to cGAS- and STING-dependent DC maturation, demonstrating that CD11c mediates endocytosis of extracellular DNA that activates the cytosolic DNA sensing pathway.\",\n      \"method\": \"Anti-CD11c antibody-DNA conjugate, cGAS KO and STING KO THP-1 cells, flow cytometric assessment of maturation markers\",\n      \"journal\": \"Journal of immunotherapy (Hagerstown, Md. : 1997)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO cell lines with functional readout in single study\",\n      \"pmids\": [\"29189388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CD11c regulates neutrophil maturation in the bone marrow; CD11c-deficient mice show impaired neutrophil maturation, increased proliferation and apoptosis of preneutrophils, and reduced effector function. Constitutively active CD11c knock-in mice display accelerated neutrophil maturation and enhanced bacterial eradication, demonstrating a direct role for CD11c signaling in neutrophil differentiation.\",\n      \"method\": \"CD11c knockout mice, constitutively active CD11c knock-in mice, bone marrow analysis, flow cytometry, LPS challenge model, bacterial clearance assay\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain- and loss-of-function genetic models with multiple cellular phenotype readouts\",\n      \"pmids\": [\"36306384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CD11c is expressed on short-term hematopoietic stem cells and multipotent progenitor cells; CD11c deficiency leads to increased apoptosis and significant loss of hematopoietic stem and progenitor cells under stress conditions (sepsis and bone marrow transplantation), but not at steady state, revealing a distinct role for CD11c in HSPC survival under stress.\",\n      \"method\": \"CD11c knockout mice, flow cytometry of bone marrow populations, sepsis model, bone marrow transplantation model, apoptosis assays\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined cellular phenotype in multiple stress models, single lab\",\n      \"pmids\": [\"33351105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SGK1 (serum glucocorticoid kinase 1) in CD11c+ antigen-presenting cells mediates high-salt-induced expression and assembly of ENaC-α and ENaC-γ (shown by co-immunoprecipitation), activates NADPH oxidase, and promotes formation of immunogenic IsoLG-protein adducts, driving salt-sensitive hypertension; mice lacking SGK1 specifically in CD11c+ cells are protected from renal inflammation and hypertension.\",\n      \"method\": \"Conditional knockout of SGK1 in CD11c+ cells, co-immunoprecipitation of ENaC subunits, NADPH oxidase activity assays, IsoLG adduct detection, blood pressure measurement, high salt/L-NAME model\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with co-IP and multiple mechanistic readouts\",\n      \"pmids\": [\"31280647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human T-bet governs the in vivo and in vitro development of a distinct CD11chiCD21lo B cell subset by controlling chromatin accessibility of lineage-defining genes (FAS, IL21R, SEC61B, DUSP4, DAPP1, SOX5, CD79B, CXCR4); a patient with inherited T-bet deficiency lacked this B cell subset, establishing T-bet as essential for CD11chi B cell differentiation.\",\n      \"method\": \"Human patient with inherited T-bet deficiency, ATAC-seq for chromatin accessibility, flow cytometry, in vitro B cell differentiation assays\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — human genetic loss-of-function combined with chromatin accessibility profiling and in vitro reconstitution\",\n      \"pmids\": [\"35867801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Zeb2 transcription factor is required for the formation of CD11c+ atypical B cells (ABCs); loss of Zeb2 by CRISPR-Cas9 knockdown impairs ABC formation, ZEB2 haplo-insufficient Mowat-Wilson syndrome patients have decreased circulating ABCs, and ABCs sustain germinal center responses and control recrudescent blood-stage malaria by promoting TFH cell formation.\",\n      \"method\": \"CRISPR-Cas9 knockdown screen in mice, human patient cohort (Mowat-Wilson syndrome), flow cytometry, immunization/infection models, Cd23-cre mice with impaired ABC formation\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR screen validated by human genetic disease and multiple functional in vivo models\",\n      \"pmids\": [\"38330097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Stearic acid (a saturated fatty acid) induces CD11c expression in monocytes/macrophages through activation of the nuclear retinoic acid receptor, a process critically dependent on cytosolic epidermal fatty acid binding protein (E-FABP); E-FABP depletion abolishes stearic acid-induced CD11c upregulation in vitro and high-saturated-fat diet-induced skin inflammation in vivo.\",\n      \"method\": \"In vitro fatty acid treatment of monocytes, siRNA depletion of E-FABP, nuclear retinoic acid receptor reporter assay, E-FABP KO mouse model, flow cytometry\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro mechanism validated by KO mouse, single lab\",\n      \"pmids\": [\"29626089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPV4 is functionally expressed in the plasma membrane of immature CD11c+ bone marrow-derived dendritic cells and its activity is downregulated upon LPS-induced maturation; TRPV4-deficient CD11c+ cells show significantly reduced Fc receptor-mediated (IgG-coated bead) phagocytosis but normal LPS-induced NF-κB activation and cytokine production, indicating TRPV4 specifically mediates Ca2+ entry required for Fc receptor-mediated phagocytosis.\",\n      \"method\": \"Intracellular Ca2+ imaging, TRPV4 KO mice, flow cytometry, phagocytosis assays with IgG-coated and uncoated beads, NF-κB nuclear translocation, cytokine measurement\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with multiple functional assays in single study\",\n      \"pmids\": [\"31295806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CD11c+ myeloid dendritic cells efficiently engulf scrapie-infected cells and unexpectedly degrade protease-resistant PrPSc, indicating that CD11c+ DCs possess potent proteolytic capacity sufficient to process otherwise protease-resistant prion protein, potentially affecting the balance between prion propagation and clearance.\",\n      \"method\": \"In vitro co-culture of CD11c+ myeloid DCs with scrapie-infected GT1-1 cells, Western blot for PrPSc degradation\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vitro functional assay with primary CD11c+ DCs, single study\",\n      \"pmids\": [\"12414965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD11c+ microglia are induced to expand by CSF1R ligands (CSF1 and IL-34), which also cause CCL2 upregulation; experimental CCL2 overexpression in the brain dramatically increases CD11c+ microglia independent of CCR2 and elevates CSF1 expression, suggesting a positive feedback loop between CSF1R and CCL2 signaling in CD11c+ microglia expansion.\",\n      \"method\": \"CSF1R ligand treatment in EAE mice, genetic CCL2 overexpression in brain, flow cytometry, CCR2 KO analysis, EAE disease scoring\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic and pharmacological manipulation with mechanistic feedback loop identified\",\n      \"pmids\": [\"30687013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Microglial SIRPα suppresses the emergence of CD11c+ microglia in brain white matter through interaction with its physiological ligand CD47; microglia-specific SIRPα knockout mice show increased CD11c+ microglia and reduced cuprizone-induced demyelination, establishing an SIRPα-CD47 axis that restrains CD11c+ microglial induction.\",\n      \"method\": \"Global SIRPα KO, CD47 KO, microglia-specific SIRPα conditional KO mice, flow cytometry, cuprizone demyelination model, gene expression analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models (global KO, ligand KO, cell-specific conditional KO) converging on same mechanism\",\n      \"pmids\": [\"30910011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CD11c+ microglia are the sole producers of Osteopontin (OPN) in the 5XFAD Alzheimer's disease mouse model and are divided into a protective OPN- subset (robust Aβ phagocytosis, non-inflammatory) and a pathogenic OPN+ subset (proinflammatory, impaired Aβ uptake); genetic ablation of OPN or anti-OPN antibody treatment reduces proinflammatory microglia, plaque formation, and cognitive deficits.\",\n      \"method\": \"5XFAD mouse model, flow cytometry, genetic OPN ablation, anti-OPN monoclonal antibody treatment, Aβ phagocytosis assay, cytokine profiling, cognitive testing, human AD brain tissue analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic and pharmacological interventions with functional and cognitive readouts\",\n      \"pmids\": [\"36730200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CD11c+ microglia with high phagocytic capability and myelin-supportive gene expression accumulate during white matter recovery after ischemic stroke; selective depletion of CD11c+ microglia (via stereotactic rAAV-taCasp3 injection in CD11c-Cre mice) disrupts white matter repair, impairs oligodendrocyte maturation, and worsens functional recovery.\",\n      \"method\": \"Mouse tMCAO stroke model, MRI DTI, immunofluorescence, flow cytometry, RNA sequencing, selective CD11c+ microglia depletion via rAAV-Caspase3 in CD11c-Cre mice, behavioral tests (Rotarod, Adhesive Removal, Morris Water Maze)\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional ablation with multiple functional readouts\",\n      \"pmids\": [\"36828819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CD11c+ cells (identified as microglia-like by scRNA-seq) traffic α-synuclein aggregates from the brain to the ileum in a brain-first mouse model of Parkinson's disease; photo-convertible protein (Dendra2) labeling demonstrates that CD11c+ cells physically migrate from the brain to the ileum, providing a cellular mechanism for brain-to-gut α-synuclein propagation.\",\n      \"method\": \"Brain-first PD mouse model, immunohistochemistry, single-cell RNA sequencing, Dendra2 photoconversion tracking of cell migration, flow cytometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct cell trafficking demonstrated by photo-convertible protein with scRNA-seq validation\",\n      \"pmids\": [\"37981650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RIPK3 in colonic CD11c+CD11b+CD14+ mononuclear phagocytes (which express the highest RIPK3 levels in the lamina propria) promotes reparative IL-23 and IL-1β expression through its RHIM domain but independently of its kinase activity; RHIM deletion specifically in CD11c+ cells worsens DSS-induced intestinal inflammation, while kinase-inactive RIPK3 mice are not hypersensitive.\",\n      \"method\": \"RIPK3-GFP reporter mice, conditional RHIM deletion in CD11c+ cells, kinase-inactive RIPK3 knock-in mice, DSS colitis model, cytokine measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain-specific mutagenesis (RHIM vs kinase) in cell-type-specific conditional models\",\n      \"pmids\": [\"28273458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Conditional deletion of aryl hydrocarbon receptor (AhR) in CD11c+ cells alters intestinal epithelial morphogenesis, reduces Paneth cells, increases goblet cell differentiation, and causes dysfunctional epithelial barrier with more severe chemically induced colitis; AhR-deficient DCs co-cultured with intestinal organoids show altered SRY-box 9 and Mucin 2 expression, linking AhR signaling in CD11c+ cells to Wnt pathway regulation and innate immunity.\",\n      \"method\": \"CD11c-Cre mediated AhR conditional KO, intestinal organoid co-culture, immunohistochemistry, DSS colitis model, APC subset characterization\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with organoid co-culture mechanistic follow-up, single study\",\n      \"pmids\": [\"27068235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CD1d expression specifically on CD11c+ cells (DCs and macrophages) is required for lipid antigen presentation to NKT cells in the gut; conditional deletion of CD1d on CD11c+ cells causes dysbiosis, altered IgA repertoire, reduced regulatory T cells, and altered intestinal NKT cell homeostasis, establishing CD11c+ cell-mediated lipid presentation as a key mechanism for intestinal immune homeostasis.\",\n      \"method\": \"Conditional CD1d KO on CD11c+ cells, intestinal microbiome analysis, IgA repertoire sequencing, flow cytometry of intestinal immune populations, NKT cell activation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple mechanistic readouts in single well-controlled study\",\n      \"pmids\": [\"29378774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A CD11chigh decidual macrophage (dMφ) subpopulation activated by trophoblast-derived galectin-9 via CD44 binding suppresses uterine spiral artery remodeling in preeclampsia; galectin-9 administration induces preeclampsia-like phenotypes with increased CD11chigh dMφ and defective spiral arteries, whereas galectin-9 blockade or macrophage-specific CD44 deletion prevents these phenotypes.\",\n      \"method\": \"scRNA-seq and spatial transcriptomics, conditional CD44 KO in macrophages, galectin-9 administration and blockade mouse models, cell-based studies, retrospective cohort study for galectin-9 levels\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic and pharmacological models with receptor-ligand mechanism identified\",\n      \"pmids\": [\"38314577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cholesterol accumulation in CD11c+ cells is sufficient to trigger autoimmunity; LXRβ-deficient mice on high-cholesterol background develop autoantibodies through CD11c+ cell-mediated T cell priming and B cell growth factor (Baff and April) production; promoting cholesterol efflux via ApoA-I expression reverses autoantibody production and B cell expansion.\",\n      \"method\": \"LXRβ/ApoE double knockout mice, high-cholesterol diet challenge, ApoA-I expression rescue, T cell priming assays, autoantibody measurement, B cell expansion analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models with rescue experiment establishing mechanistic pathway\",\n      \"pmids\": [\"28002731\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ITGAX (CD11c/alphaXbeta2 integrin) is a multifunctional beta2 integrin that acts as a direct LPS signaling receptor (via NF-κB), an adhesion molecule binding iC3b, fibrinogen, ICAM-1/2, VCAM-1, and heparin through its I domain in a Mg2+-dependent and conformationally regulated manner, whose expression is transcriptionally controlled by AP-1 and Ets factors; beyond its canonical role as a dendritic cell/macrophage identity marker mediating antigen presentation and leukocyte recruitment, CD11c directly regulates neutrophil maturation in the bone marrow, hematopoietic stem/progenitor cell survival under stress, white matter repair by microglia, intestinal immune homeostasis through CD1d-mediated lipid antigen presentation on CD11c+ cells, and gut-to-brain alpha-synuclein trafficking, with its expression on specific myeloid subsets driven by pathways including SGK1-ENaC-NADPH oxidase (salt sensing), E-FABP-retinoic acid receptor (saturated fatty acid sensing), and SIRPα-CD47 interactions (microglial subset control).\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1987,\n      \"finding\": \"ITGAX (CD11c/p150,95) encodes the alpha subunit of a leukocyte adhesion glycoprotein. cDNA cloning revealed a 1081-aa extracellular domain with three tandem homologous repeats containing putative divalent cation-binding sites, a 26-aa transmembrane domain, and a 29-residue cytoplasmic tail, establishing it as a member of the integrin superfamily (alpha/beta heterodimer with the shared beta2/CD18 subunit).\",\n      \"method\": \"cDNA cloning, peptide sequencing, sequence analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original molecular cloning with full structural characterization, foundational paper\",\n      \"pmids\": [\"3327687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"p150,95 (CD11c/CD18) was identified as an iC3b-binding protein. It was co-purified with complement receptor 3 (CR3) on iC3b-Sepharose affinity columns and co-immunodepleted with anti-CR3 beta-subunit antibody, demonstrating that p150,95 functions as a complement fragment iC3b receptor.\",\n      \"method\": \"Affinity chromatography (iC3b-Sepharose), immunodepletion\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical purification with affinity chromatography, foundational discovery\",\n      \"pmids\": [\"4062888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The I domain of the CD11c (alphaX) subunit was identified as the major ligand recognition site for iC3b. Cells co-transfected with human p150,95 alpha and chicken (but not human) beta2 subunit bound iC3b-sensitized erythrocytes, and binding was abolished by I-domain-specific monoclonal antibodies, demonstrating that the I domain mediates iC3b recognition and that alpha/beta subunit interactions regulate p150,95 adhesiveness.\",\n      \"method\": \"Heterologous transfection (human alphaX + chicken or human beta2), cell adhesion assay, mAb blocking\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in transfected cells with domain-specific antibody blocking, multiple orthogonal approaches\",\n      \"pmids\": [\"7512600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"The genes encoding the alpha subunits of Mac-1, LFA-1, and p150,95 (ITGAX) were mapped to chromosome 16p11-p13.1 by Southern blot analysis of somatic cell hybrids and chromosomal in situ hybridization, defining a leukocyte integrin alpha-subunit gene cluster.\",\n      \"method\": \"Southern blot, somatic cell hybrid analysis, chromosomal in situ hybridization\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct genomic mapping with multiple methods\",\n      \"pmids\": [\"3284962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"CD11c/CD18 (alphaX beta2) functions as a transmembrane signaling receptor for LPS. CHO cells transfected with CD11c/CD18 (but not untransfected CHO cells) acquired serum-independent NF-kappaB activation in response to Gram-negative bacteria and LPS, demonstrating CD11c/CD18 is sufficient to initiate LPS-dependent intracellular signaling independently of CD14.\",\n      \"method\": \"Heterologous expression in CHO cells, NF-kappaB translocation assay, antibody blocking\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in heterologous cells with defined readout, compared to CD14-transfected controls\",\n      \"pmids\": [\"7535339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"CD23 (the low-affinity IgE receptor) was identified as a novel ligand for the CD11c and CD11b alpha chains. Recombinant CD23 in fluorescent liposomes bound COS cells transfected with CD11c/CD18 or CD11b/CD18 but not CD11a/CD18. Triggering CD11c on monocytes with recombinant CD23 or anti-CD11c antibodies induced nitrite production and pro-inflammatory cytokines (IL-1beta, IL-6, TNF-alpha), establishing CD23–CD11c/CD18 as a functional monocyte activation axis.\",\n      \"method\": \"Transfection of COS cells, fluorescent liposome binding assay, antibody blocking, functional cytokine assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — binding confirmed with transfected cells plus multiple functional readouts\",\n      \"pmids\": [\"7621072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"AP-1 transcription factor complex (c-Fos/c-Jun) regulates both basal and differentiation-induced transcription of the CD11c leukocyte integrin gene. Footprinting, mobility shift, in vivo footprinting, co-transfection, and site-directed mutagenesis of the proximal promoter identified a functional AP-1 site at position -60 (AP1-60) as essential for CD11c promoter activity in myeloid and B cells, and for PMA-induced upregulation during U937 differentiation.\",\n      \"method\": \"DNase I footprinting, EMSA, in vivo footprinting, co-transfection with c-fos/c-jun expression constructs, site-directed mutagenesis, CAT reporter assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including mutagenesis confirming functional AP-1 site\",\n      \"pmids\": [\"8621914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Dithiocarbamate antioxidants (DTCs) induce CD11c expression in myeloid cells via AP-1. PDTC increased CD11c mRNA and promoter activity in U937 promonocytic cells. Transfections with promoter-deletion constructs localized a DTC-responsive region to -160 to +40; gel shift assays showed PDTC-induced Fos/Jun complexes binding to an AP-1 site at -60; in vitro mutagenesis confirmed its functional importance.\",\n      \"method\": \"Reporter gene transfection, EMSA, in vitro mutagenesis, RT-PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus multiple reporter and binding assays\",\n      \"pmids\": [\"8631910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"A second Ets-binding site (Ets C, at -42 to -34) cooperates with AP-1 sites to regulate CD11c expression in response to phorbol ester (PMA). Deletion of Ets C significantly reduced PMA-induced CD11c promoter activity, while deletion of Ets A (-13 to -5) had only modest effects. Five footprinted protein-binding sites were defined in the -86 to +40 proximal promoter region.\",\n      \"method\": \"DNase I footprinting, EMSA with purified c-Jun, co-transfection, CAT reporter assay, promoter deletion analysis\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter deletion and binding assays defining multiple cis-regulatory elements\",\n      \"pmids\": [\"8649434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Recognition of fibrinogen by alphaX beta2 (CD11c/CD18) is mediated through the gamma C domain (gamma 143-411) of fibrinogen, specifically sequences gamma 190-202 (P1) and gamma 377-395 (P2). Synthetic peptides duplicating these sequences and neutrophil inhibitory factor (NIF) inhibited alphaX beta2-mediated cell adhesion to fibrinogen D fragment, demonstrating shared structural requirements with alphaM beta2 for fibrinogen gamma C recognition.\",\n      \"method\": \"Cell adhesion assay, inhibition with synthetic peptides and NIF, recombinant gamma-module binding\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct cell adhesion with peptide inhibition, single lab but multiple inhibitory approaches\",\n      \"pmids\": [\"11460493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"JAM-3 (junctional adhesion molecule 3) on human platelets is a counterreceptor for p150,95 (alphaX beta2, CD11c/CD18). Myelomonocytic cells adhered to immobilized JAM-3 or JAM-3-transfected cells; this heterophilic interaction was attributed to direct interaction of JAM-3 with CD11c/CD18 (and to a lesser extent with CD11b/CD18), as demonstrated by K562 cells transfected with distinct beta2-integrin heterodimers and purified protein studies.\",\n      \"method\": \"Cell adhesion assay, transfected K562 cells expressing specific beta2-integrin heterodimers, purified protein binding\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purified protein and transfection reconstitution, multiple cell-based assays\",\n      \"pmids\": [\"12208882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Activation of leukocyte integrin alphaX beta2 (CD11c/CD18) requires conversion from a bent to an extended conformation. Negative-stain electron microscopy showed that alphaX beta2 transitions between a bent and two extended conformations (closed and open headpiece). A transmembrane clasp strongly stabilized the bent conformation for alphaX beta2. Both conformational extension and headpiece opening are required for integrin activation and ligand binding.\",\n      \"method\": \"Negative stain electron microscopy, engineered clasp mutants, Fab-based conformational reporter assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural EM combined with functional mutant and Fab studies\",\n      \"pmids\": [\"17045822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The alphaX I domain of CD11c/CD18 binds heparin in a conformation- and Mg2+-dependent manner. Heparin oligomers of ≥10 saccharide residues inhibit alphaX I domain binding to iC3b; fully sulfated 12-saccharide heparin had 1.3 µM affinity for the alphaX I domain. Fully sulfated heparin induced conformational change in the alphaX beta2 ectodomain, demonstrating allosteric linkage between heparin binding and integrin conformation.\",\n      \"method\": \"Binding inhibition assay (iC3b competition), direct binding to immobilized heparin, conformational change assay, synthetic heparinoid analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple in vitro binding assays with defined oligomers and conformational readout\",\n      \"pmids\": [\"17699512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CD11c/CD18 recognizes ICAM-2 and VCAM-1 as novel ligands. Cell adhesion assays demonstrated CD11c-mediated adhesion to ICAM-2 and VCAM-1, with the CD11c-binding site on VCAM-1 distinct from that used by alpha4 integrin. CD11c and alpha4 beta1 cooperated in monocyte capture and transmigration on inflamed human aortic endothelial cells. The N418 anti-mouse CD11c mAb blocked CD11c binding to iC3b, ICAM-1, and VCAM-1. In vivo, N418 treatment significantly reduced SRBC-induced delayed-type hypersensitivity, predominantly affecting the sensitization phase.\",\n      \"method\": \"Cell adhesion quantification assay, monocyte transmigration assay on inflamed endothelium, in vivo DTH model with antibody blockade\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro binding and transmigration assays replicated in vivo with blocking antibody\",\n      \"pmids\": [\"17389580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The crystal structure of alphaX beta2 (complement receptor type 4) was solved. The alphaI domain is highly flexible relative to the beta-propeller domain, allowing two betaI domain conformational states to couple to three alphaI domain states. The alpha- and beta-legs are oriented differently from alphaI-less integrins. Activating mutations and antibody epitope positions support that extension and headpiece opening (not a deadbolt mechanism) drive integrin activation.\",\n      \"method\": \"X-ray crystallography (10 molecules in crystal lattices), structural analysis, mutant mapping\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with multiple molecules and functional mutant mapping\",\n      \"pmids\": [\"20033057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CD11c deficiency in mice decreased firm arrest of monocytes on VCAM-1 and E-selectin under shear flow, reduced monocyte/macrophage accumulation in atherosclerotic lesions, and decreased atherosclerosis in apoE-/- mice on a high-fat diet. CD11c expression on blood monocytes increased during hypercholesterolemia. This establishes CD11c as a mediator of monocyte adhesion to the endothelium and atherosclerosis development.\",\n      \"method\": \"CD11c knockout mouse generation, shear flow adhesion assay (VCAM-1 and E-selectin substrates), flow cytometry, atherosclerosis quantification\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with in vitro functional assay and in vivo atherosclerosis model\",\n      \"pmids\": [\"19433759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CD11c deficiency in obese mice did not alter weight gain but decreased adipose tissue inflammation (reduced T-cell numbers, MHC class II, CCL2, CCL5, CCL4, and IFN-gamma) and ameliorated insulin resistance and glucose intolerance. This establishes CD11c as a contributor to T-cell accumulation and activation in adipose tissue, linking it mechanistically to obesity-associated insulin resistance.\",\n      \"method\": \"CD11c knockout mouse on high-fat diet, flow cytometry, RNase protection assay, qPCR, ELISA, insulin and glucose tolerance tests\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple functional metabolic and immune readouts\",\n      \"pmids\": [\"19910635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Activation of alphaX beta2 requires both integrin extension and open headpiece conformation. Negative stain EM and adhesion assays showed that the extended-open headpiece conformation has high affinity for ligand, whereas both the bent conformation and the extended-closed headpiece conformation are low-affinity states. Two activating Fabs stabilized the open headpiece; two inhibitory Fabs stabilized the closed headpiece.\",\n      \"method\": \"Negative stain electron microscopy, Fab conformational reporters and activators/inhibitors, cell adhesion assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — EM structural data combined with multiple functional Fab perturbation and adhesion assays\",\n      \"pmids\": [\"20679211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CD11c/CD18 expression is upregulated on blood monocytes during hypertriglyceridemia via internalization of triglyceride-rich lipoproteins through LDL-receptor-related protein-1 (LRP-1). Elevated CD11c correlated with increased monocyte arrest on VCAM-1 under shear flow; CD11c levels fell as blood triglycerides normalized. This establishes a mechanistic link between postprandial lipid uptake, CD11c upregulation, and enhanced monocyte adhesion to the endothelium.\",\n      \"method\": \"Flow cytometry, laboratory-on-a-chip shear flow assay on VCAM-1, lipoprotein internalization assay with LRP-1 blocking\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic connection from lipid uptake to receptor upregulation to functional adhesion confirmed in vitro and in human subjects\",\n      \"pmids\": [\"21030716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CD11c/CD18 dominates adhesion of human monocytes, macrophages, and dendritic cells to fibrinogen over CD11b/CD18. Using a bead-based quantification of receptor numbers and biophysical adhesion assays, CD11c was shown to be the primary adhesion mediator to fibrinogen on MDDCs and MDMs. Blocking CD11b significantly enhanced MDDC and MDM attachment, revealing competitive inhibition between CD11b and CD11c for fibrinogen binding.\",\n      \"method\": \"Bead-based receptor quantification, biophysical cell adhesion assays, antibody-blocking experiments on monocytes/MDMs/MDDCs\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative biophysical approach with functional blocking, single study\",\n      \"pmids\": [\"27658051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Stearic acid (SA), a saturated fatty acid, induces CD11c expression in monocytes/macrophages through epidermal fatty acid binding protein (E-FABP)-mediated activation of the nuclear retinoic acid receptor. E-FABP depletion inhibited SA-induced CD11c upregulation in vitro and abrogated high-saturated-fat diet-induced inflammatory skin lesions in obese mice, establishing E-FABP/retinoic acid receptor as the intracellular pathway linking saturated fatty acids to CD11c expression.\",\n      \"method\": \"In vitro monocyte culture with fatty acids, E-FABP knockdown, reporter assays, in vivo dietary model in E-FABP-deficient mice\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function in vitro and in vivo with defined molecular pathway\",\n      \"pmids\": [\"29626089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPV4 is functionally expressed in the plasma membrane of immature CD11c+ bone-marrow-derived dendritic cells and its activity and expression are downregulated upon LPS-induced maturation. TRPV4-deficient CD11c+ BMDCs show a significantly reduced capacity for Fc receptor-mediated phagocytosis (IgG-coated beads) but not for non-opsonized phagocytosis, establishing a role for TRPV4-mediated Ca2+ entry in the Fc receptor phagocytosis pathway of CD11c+ DCs.\",\n      \"method\": \"Intracellular Ca2+ imaging, Trpv4 knockout BMDCs, phagocytosis assay (IgG-coated vs. uncoated beads), NF-kappaB translocation, cytokine assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with specific functional readout distinguishing Fc-dependent vs. independent phagocytosis\",\n      \"pmids\": [\"31295806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CD11c is expressed on short-term hematopoietic stem cells and multipotent progenitor cells (HSPCs). CD11c deficiency does not affect steady-state HSPC numbers but leads to increased apoptosis and significant HSPC loss during sepsis and bone marrow transplantation, demonstrating a distinct, non-redundant role for CD11c in HSPC survival under stress conditions.\",\n      \"method\": \"CD11c knockout mouse, flow cytometry of bone marrow compartments, sepsis model, BMT model, apoptosis assays\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with two stress models and defined apoptosis phenotype\",\n      \"pmids\": [\"33351105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CD11c regulates neutrophil maturation in the bone marrow. CD11c-deficient mice show impaired neutrophil maturation with increased preneutrophil proliferation and apoptosis and reduced effector functions. Under LPS-induced emergency granulopoiesis, CD11c deficiency exaggerated immature neutrophil release. Conversely, constitutively active CD11c knock-in mice displayed accelerated neutrophil maturation, enhanced effector functions, and improved bacterial clearance.\",\n      \"method\": \"CD11c knockout and constitutively active CD11c knock-in mice, flow cytometry of bone marrow maturation stages, LPS challenge, bacterial clearance assay\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic perturbation (KO + gain-of-function knock-in) with consistent phenotype and functional readouts\",\n      \"pmids\": [\"36306384\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ITGAX (CD11c/p150,95) encodes the alpha subunit of the leukocyte beta2-integrin alphaXbeta2 (CD11c/CD18), which exists in bent (inactive) and extended open-headpiece (active, high-affinity) conformations; the alphaX I domain mediates recognition of multiple ligands including iC3b, fibrinogen gamma-C domain (P1/P2 sequences), heparin, ICAM-1, ICAM-2, VCAM-1, JAM-3, LPS, and CD23; its promoter is transcriptionally driven by AP-1 (c-Fos/c-Jun) and Ets factors; beyond its classical adhesion and phagocytic receptor role on dendritic cells and macrophages, CD11c regulates neutrophil maturation in the bone marrow, supports hematopoietic stem/progenitor cell survival under stress, and mediates monocyte arrest on endothelium during hyperlipidemia via LRP-1-dependent lipid uptake and E-FABP/retinoic acid receptor-mediated transcriptional upregulation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ITGAX (CD11c/αXβ2 integrin) is a β2 integrin expressed on dendritic cells, macrophages, monocytes, microglia, neutrophils, hematopoietic stem/progenitor cells, and atypical B cells that functions as both an adhesion receptor and a transmembrane signaling molecule governing leukocyte recruitment, innate immune activation, and myeloid cell differentiation. As an adhesion receptor, CD11c binds iC3b, fibrinogen, heparin, ICAM-1/2, and VCAM-1 through its I domain in a Mg²⁺-dependent, conformationally regulated manner, mediating monocyte firm arrest and transmigration—including during atherogenesis where CD11c deficiency reduces lesion formation [PMID:17699512, PMID:17389580, PMID:19433759, PMID:27658051]. CD11c also functions as a direct LPS signaling receptor that activates NF-κB independently of CD14 [PMID:7535339], regulates neutrophil maturation in bone marrow through a gain-of-function/loss-of-function axis [PMID:36306384], promotes hematopoietic stem/progenitor cell survival under stress [PMID:33351105], and on microglia drives white matter repair after ischemic stroke and amyloid-β phagocytosis in neurodegeneration [PMID:36828819, PMID:36730200]. CD11c⁺ antigen-presenting cells maintain intestinal immune homeostasis through CD1d-mediated lipid antigen presentation to NKT cells, and CD11c⁺ microglia-like cells physically traffic α-synuclein aggregates from brain to gut in a Parkinson's disease model [PMID:29378774, PMID:37981650].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing that CD11c is not merely an adhesion molecule but a direct transmembrane LPS signaling receptor capable of activating NF-κB independently of CD14 redefined its functional scope beyond cell adhesion.\",\n      \"evidence\": \"Heterologous expression in CHO cells with NF-κB translocation readout and antibody blocking\",\n      \"pmids\": [\"7535339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling intermediates between CD11c and NF-κB were not identified\", \"Physiological relevance in primary myeloid cells not tested in this study\", \"Structural basis for LPS recognition by αXβ2 undefined\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identification of AP-1 and Ets transcription factor binding sites as critical regulators of ITGAX transcription established how CD11c expression is induced during myeloid differentiation.\",\n      \"evidence\": \"In vivo footprinting, EMSA, mutagenesis of promoter elements, and reporter assays in myeloid cell lines\",\n      \"pmids\": [\"8621914\", \"8631910\", \"8649434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin-level regulation (enhancers, epigenetic marks) was not addressed\", \"Whether AP-1/Ets control is sufficient for lineage-specific expression in vivo remains untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Biochemical characterization of the αX I domain revealed Mg²⁺-dependent, conformationally regulated heparin binding that allosterically competes with iC3b, and identification of ICAM-2 and VCAM-1 as novel ligands broadened the adhesive repertoire mediating leukocyte recruitment and transmigration.\",\n      \"evidence\": \"In vitro binding assays with purified I domain, competitive inhibition, shear flow adhesion/transmigration assays on endothelial cells, in vivo DTH blockade with anti-CD11c mAb\",\n      \"pmids\": [\"17699512\", \"17389580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of αX I domain bound to heparin or VCAM-1 not determined\", \"Relative contributions of each ligand in vivo tissue contexts unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Genetic loss of CD11c in atherosclerosis-prone mice demonstrated that CD11c-mediated monocyte adhesion to VCAM-1/E-selectin is a rate-limiting step in atherogenesis, moving the integrin from correlative marker to causal effector in cardiovascular disease.\",\n      \"evidence\": \"CD11c KO × apoE−/− mice, shear flow adhesion assay, histological lesion quantification\",\n      \"pmids\": [\"19433759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CD11c signals beyond adhesion (e.g., intracellular signaling in plaque macrophages) contributes to lesion progression not tested\", \"Human genetic validation absent\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Quantitative biophysical studies resolved a longstanding question by showing CD11c/CD18, not CD11b/CD18, dominates fibrinogen binding in monocytes, macrophages, and DCs, with competitive interplay between the two integrins.\",\n      \"evidence\": \"Bead-based receptor quantification and adhesion assays with antibody blocking on primary human cells\",\n      \"pmids\": [\"27658051\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo functional consequences of this dominance hierarchy not established\", \"Structural basis for competitive binding to fibrinogen unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Conditional genetic studies in CD11c⁺ cells revealed that these cells serve as master regulators of intestinal epithelial morphogenesis (via AhR-Wnt signaling) and systemic autoimmunity (via cholesterol-driven T/B cell priming), extending CD11c⁺ cell function far beyond antigen presentation.\",\n      \"evidence\": \"CD11c-Cre AhR conditional KO with organoid co-culture and DSS colitis; LXRβ/ApoE double KO with ApoA-I rescue, autoantibody and B cell analysis\",\n      \"pmids\": [\"27068235\", \"28002731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CD11c integrin signaling itself (vs. CD11c as a lineage marker for Cre targeting) drives these phenotypes is not distinguished\", \"Mechanism linking cholesterol sensing to Baff/April secretion in CD11c⁺ cells not fully delineated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"RIPK3's RHIM domain (but not kinase activity) in colonic CD11c⁺ mononuclear phagocytes was shown to drive reparative IL-23/IL-1β production during intestinal injury, revealing a kinase-independent scaffolding function in CD11c⁺ cell-mediated tissue repair.\",\n      \"evidence\": \"RHIM-specific conditional deletion in CD11c⁺ cells vs. kinase-dead knock-in, DSS colitis model\",\n      \"pmids\": [\"28273458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RHIM-interacting partners in CD11c⁺ colonic phagocytes not identified\", \"Whether CD11c integrin signaling intersects with RIPK3-RHIM pathway unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CD1d-mediated lipid antigen presentation specifically by CD11c⁺ cells was established as essential for intestinal NKT cell homeostasis, IgA repertoire diversity, and microbiome composition, defining a non-redundant role for CD11c⁺ APCs in mucosal immunity.\",\n      \"evidence\": \"Conditional CD1d deletion on CD11c⁺ cells, microbiome 16S sequencing, IgA repertoire analysis, NKT activation\",\n      \"pmids\": [\"29378774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific lipid antigens presented by CD11c⁺ cells to intestinal NKT cells not identified\", \"Whether CD11c integrin itself facilitates lipid antigen uptake unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The SIRPα-CD47 inhibitory axis was identified as a gatekeeper controlling CD11c⁺ microglial emergence in white matter, establishing a receptor-ligand checkpoint for a disease-associated microglial phenotype relevant to demyelination.\",\n      \"evidence\": \"Global SIRPα KO, CD47 KO, and microglia-specific SIRPα conditional KO in cuprizone demyelination model\",\n      \"pmids\": [\"30910011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling from SIRPα that specifically represses CD11c expression uncharacterized\", \"Whether this checkpoint operates in human microglia not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"SGK1-ENaC-NADPH oxidase signaling in CD11c⁺ APCs was identified as a salt-sensing pathway that generates immunogenic IsoLG adducts driving hypertension, linking dietary sodium to adaptive immune activation through a specific intracellular cascade in CD11c⁺ cells.\",\n      \"evidence\": \"Conditional SGK1 deletion in CD11c⁺ cells, co-IP of ENaC subunits, NADPH oxidase activity, high-salt/L-NAME hypertension model\",\n      \"pmids\": [\"31280647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CD11c integrin engagement modulates SGK1-ENaC signaling unknown\", \"Human validation of this pathway in CD11c⁺ APCs lacking\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Discovery that CD11c is expressed on HSPCs and required for their survival under stress (sepsis, transplantation) but not at steady state revealed an unexpected non-immune role for this integrin in hematopoietic stem cell biology.\",\n      \"evidence\": \"CD11c KO mice, sepsis and bone marrow transplantation stress models, apoptosis assays\",\n      \"pmids\": [\"33351105\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ligand and signaling pathway through which CD11c protects HSPCs from apoptosis not identified\", \"Not independently replicated\", \"Whether this reflects cell-autonomous integrin signaling or microenvironmental adhesion unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"T-bet was established as an essential transcription factor for the differentiation of CD11cᴴⁱ atypical B cells through control of chromatin accessibility, confirmed by a human patient with inherited T-bet deficiency who lacked this subset entirely.\",\n      \"evidence\": \"Human T-bet-deficient patient, ATAC-seq, in vitro B cell differentiation\",\n      \"pmids\": [\"35867801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How T-bet directly activates ITGAX locus in B cells not determined\", \"Whether CD11c has functional signaling roles in atypical B cells (beyond marker status) unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reciprocal gain- and loss-of-function CD11c mouse models demonstrated that CD11c directly regulates neutrophil maturation in the bone marrow, with constitutively active CD11c accelerating maturation and enhancing bacterial clearance, establishing CD11c as a differentiation signal rather than merely a surface marker.\",\n      \"evidence\": \"CD11c KO and constitutively active knock-in mice, bone marrow neutrophil analysis, LPS challenge, bacterial clearance\",\n      \"pmids\": [\"36306384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling cascade downstream of CD11c that controls neutrophil maturation not mapped\", \"Ligand that triggers CD11c signaling during neutrophil maturation in marrow niche unidentified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"CD11c⁺ microglia were shown to be essential for white matter repair after stroke (via oligodendrocyte maturation support) and to bifurcate into protective (OPN⁻, phagocytic) vs. pathogenic (OPN⁺, proinflammatory) subsets in Alzheimer's disease, providing functional resolution of the disease-associated microglia concept.\",\n      \"evidence\": \"Selective CD11c⁺ microglia ablation via rAAV-Caspase3 in CD11c-Cre mice post-stroke; OPN genetic ablation and anti-OPN antibody in 5XFAD mice with cognitive testing\",\n      \"pmids\": [\"36828819\", \"36730200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular signals that determine OPN⁺ vs. OPN⁻ fate decision in CD11c⁺ microglia unknown\", \"Whether CD11c integrin signaling directly regulates oligodendrocyte maturation or acts indirectly through secreted factors not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Photo-convertible protein tracking demonstrated that CD11c⁺ microglia-like cells physically migrate from brain to ileum carrying α-synuclein aggregates, establishing a cellular mechanism for brain-to-gut pathology propagation in Parkinson's disease.\",\n      \"evidence\": \"Dendra2 photoconversion cell tracking, scRNA-seq, brain-first PD mouse model\",\n      \"pmids\": [\"37981650\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CD11c⁺ cell transendothelial migration from CNS to gut not defined\", \"Whether this pathway operates in human PD not established\", \"Whether CD11c integrin itself mediates the trafficking or is a bystander marker unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Zeb2 was identified as a master transcription factor for CD11c⁺ atypical B cell formation, validated by human ZEB2 haploinsufficiency (Mowat-Wilson syndrome), and these cells were shown to sustain germinal center responses and control malaria recrudescence.\",\n      \"evidence\": \"CRISPR-Cas9 screen, Mowat-Wilson syndrome patient cohort, infection models\",\n      \"pmids\": [\"38330097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional regulation of ITGAX locus by ZEB2 not demonstrated\", \"Whether CD11c has a functional role vs. marker role on ABCs in infection unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A central unresolved question is whether CD11c integrin signaling itself—as opposed to CD11c serving as a lineage marker for Cre-based targeting—directly drives the numerous biological phenotypes attributed to CD11c⁺ cells; the intracellular signaling cascade downstream of αXβ2 engagement remains largely unmapped.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No systematic mapping of CD11c outside-in signaling intermediates exists\", \"Structural basis for CD11c-ligand interactions (beyond I domain-heparin) not resolved at atomic level\", \"Whether CD11c has unique signaling functions distinct from other β2 integrins (CD11a, CD11b) remains unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [3, 4, 5, 6]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 4, 5, 6, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 4, 5, 7, 23]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [4, 5, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 10]}\n    ],\n    \"complexes\": [\n      \"αXβ2 integrin (CD11c/CD18)\"\n    ],\n    \"partners\": [\n      \"ITGB2\",\n      \"ICAM1\",\n      \"ICAM2\",\n      \"VCAM1\",\n      \"C3\",\n      \"FGA\",\n      \"CD47\",\n      \"SIRPA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"ITGAX (CD11c) encodes the alpha-X subunit of the leukocyte β2-integrin αXβ2 (CD11c/CD18), a multiligand adhesion and signaling receptor expressed predominantly on dendritic cells, macrophages, monocytes, and neutrophils that functions in complement-mediated phagocytosis, leukocyte trafficking, and innate immune activation. The αX I domain mediates recognition of iC3b, fibrinogen γC-domain, heparin, ICAM-1, ICAM-2, VCAM-1, JAM-3, LPS, and CD23, with ligand binding requiring transition from a bent, low-affinity conformation to an extended, open-headpiece high-affinity state as demonstrated by electron microscopy and X-ray crystallography [PMID:17045822, PMID:20033057, PMID:20679211]. Beyond classical adhesion, CD11c drives monocyte arrest on inflamed endothelium during hyperlipidemia via LRP-1-dependent lipoprotein uptake and E-FABP/retinoic acid receptor–mediated transcriptional upregulation, contributing to atherosclerosis and obesity-associated insulin resistance [PMID:19433759, PMID:21030716, PMID:29626089, PMID:19910635]. CD11c also has non-redundant roles in neutrophil maturation in the bone marrow and in hematopoietic stem/progenitor cell survival under stress, as shown by bidirectional genetic perturbation in mice [PMID:36306384, PMID:33351105].\",\n  \"teleology\": [\n    {\n      \"year\": 1985,\n      \"claim\": \"Establishing that p150,95 (later CD11c/CD18) is an iC3b receptor resolved the identity of the third complement-binding leukocyte surface glycoprotein and positioned it alongside CR3 as a phagocytic complement receptor.\",\n      \"evidence\": \"Affinity chromatography on iC3b-Sepharose and immunodepletion with anti-β2 antibody\",\n      \"pmids\": [\"4062888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site on the α-subunit not yet mapped\", \"Functional distinction from CR3 in phagocytosis unclear\"]\n    },\n    {\n      \"year\": 1987,\n      \"claim\": \"Cloning of the ITGAX cDNA revealed that CD11c is an integrin α-subunit with divalent cation-binding repeats and a short cytoplasmic tail, establishing its molecular architecture and membership in the β2-integrin family.\",\n      \"evidence\": \"cDNA cloning with peptide sequencing and sequence analysis\",\n      \"pmids\": [\"3327687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Three-dimensional structure unknown\", \"Signaling domains in cytoplasmic tail uncharacterized\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Demonstrating that the αX I domain mediates iC3b recognition resolved the ligand-binding domain within CD11c and showed that α/β subunit pairing regulates adhesiveness.\",\n      \"evidence\": \"Heterologous transfection of human αX with chicken vs. human β2, mAb blocking of the I domain\",\n      \"pmids\": [\"7512600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-level I domain–iC3b interface undetermined\", \"Mechanism of β-subunit regulation of I-domain conformation unclear\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of LPS and CD23 as ligands expanded CD11c beyond a complement receptor to a transmembrane innate-immune signaling receptor capable of NF-κB activation and pro-inflammatory cytokine production independently of CD14.\",\n      \"evidence\": \"CHO and COS cell reconstitution with defined integrin heterodimers, NF-κB translocation, cytokine and nitrite assays\",\n      \"pmids\": [\"7535339\", \"7621072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling intermediates between CD11c and NF-κB unknown\", \"In vivo relevance of CD23–CD11c axis not tested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Mapping functional AP-1 and Ets cis-regulatory elements in the proximal CD11c promoter revealed the transcription factor network controlling basal and differentiation-induced ITGAX expression in myeloid cells.\",\n      \"evidence\": \"DNase I footprinting, EMSA, in vivo footprinting, site-directed mutagenesis, CAT reporter assays in U937 and B cells\",\n      \"pmids\": [\"8621914\", \"8631910\", \"8649434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin-level regulation and distal enhancers uncharacterized\", \"Lineage-specific silencing mechanisms unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapping fibrinogen recognition to γC-domain peptides P1 and P2 defined the molecular determinants of CD11c-fibrinogen interaction and showed shared structural requirements with αMβ2.\",\n      \"evidence\": \"Cell adhesion assays with synthetic γC-domain peptides and NIF inhibition\",\n      \"pmids\": [\"11460493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab observation; crystal structure of I domain–fibrinogen complex lacking\", \"Relative contribution of CD11c vs. CD11b to fibrinogen binding in vivo unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Electron microscopy of αXβ2 directly visualized the bent-to-extended conformational switch and demonstrated that both extension and headpiece opening are required for activation, resolving the structural mechanism of integrin inside-out signaling.\",\n      \"evidence\": \"Negative-stain EM with engineered transmembrane clasps and Fab conformational reporters\",\n      \"pmids\": [\"17045822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution cryo-EM of the fully open ligand-bound state not yet obtained\", \"Intracellular signals triggering conformational switch not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery of heparin, ICAM-2, and VCAM-1 as additional I-domain ligands, with in vivo blocking reducing delayed-type hypersensitivity, established CD11c as a multi-ligand adhesion receptor involved in leukocyte trafficking beyond complement-opsonized targets.\",\n      \"evidence\": \"Cell adhesion assays, monocyte transmigration on inflamed endothelium, heparin oligomer competition, in vivo DTH model with anti-CD11c antibody\",\n      \"pmids\": [\"17699512\", \"17389580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for ligand selectivity among I-domain ligands not defined\", \"Relative hierarchy of ligand engagement in vivo unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The crystal structure of αXβ2 revealed high flexibility of the αI domain relative to the β-propeller and defined how two βI-domain states couple to three αI-domain conformations, providing a structural framework for understanding integrin activation without a deadbolt mechanism.\",\n      \"evidence\": \"X-ray crystallography of 10 molecules in lattices with activating mutant mapping\",\n      \"pmids\": [\"20033057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full ectodomain structure in fully active, ligand-bound state not captured\", \"Membrane-proximal and transmembrane regions absent from the crystal\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Genetic deletion of CD11c in apoE−/− mice reduced monocyte arrest on VCAM-1 under flow and decreased atherosclerotic lesion size, establishing CD11c as a non-redundant mediator of monocyte recruitment to the arterial wall during hypercholesterolemia.\",\n      \"evidence\": \"CD11c KO mice, shear-flow adhesion assay, atherosclerosis quantification in high-fat diet model\",\n      \"pmids\": [\"19433759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific contributions (monocyte vs. DC vs. macrophage) not dissected\", \"Downstream intracellular signaling in atherogenesis not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"CD11c deficiency ameliorated obesity-induced adipose tissue inflammation and insulin resistance, revealing a role for CD11c in T-cell accumulation and inflammatory polarization in metabolic disease.\",\n      \"evidence\": \"CD11c KO mice on high-fat diet with metabolic phenotyping, flow cytometry, cytokine profiling\",\n      \"pmids\": [\"19910635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CD11c acts on macrophages, DCs, or both in adipose tissue not resolved\", \"Direct ligand interaction in adipose tissue not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linking postprandial triglyceride-rich lipoprotein internalization via LRP-1 to CD11c surface upregulation and enhanced monocyte adhesion provided a molecular mechanism connecting dietary lipid metabolism to vascular inflammation.\",\n      \"evidence\": \"Flow cytometry on human monocytes, shear-flow adhesion assay, LRP-1 blocking in vitro and triglyceride normalization in vivo\",\n      \"pmids\": [\"21030716\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular trafficking route from LRP-1 to CD11c surface expression not defined\", \"Whether lipid cargo directly affects CD11c transcription or recycling unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of the E-FABP/retinoic acid receptor axis as the intracellular pathway linking stearic acid to CD11c upregulation connected saturated fatty acid sensing to integrin-mediated inflammation in obesity.\",\n      \"evidence\": \"E-FABP knockdown/knockout in vitro and dietary model in E-FABP-deficient mice, reporter assays\",\n      \"pmids\": [\"29626089\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this pathway operates in human monocytes in vivo is untested\", \"Interaction with the AP-1 transcriptional program not examined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrating that CD11c is expressed on HSPCs and is required for their survival during sepsis and transplantation extended CD11c function beyond mature leukocyte adhesion to hematopoietic stress resilience.\",\n      \"evidence\": \"CD11c KO mice, sepsis and bone marrow transplant models, apoptosis assays by flow cytometry\",\n      \"pmids\": [\"33351105\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ligand or signaling pathway mediating HSPC survival unknown\", \"Whether this is cell-autonomous or niche-dependent is not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Bidirectional genetic perturbation (KO and constitutively active knock-in) showed that CD11c controls neutrophil maturation in the bone marrow, with loss causing maturation arrest and gain-of-function accelerating maturation and bacterial clearance, establishing a previously unrecognized developmental role.\",\n      \"evidence\": \"CD11c KO and constitutively active knock-in mice, bone marrow maturation staging, LPS-induced granulopoiesis, bacterial clearance assay\",\n      \"pmids\": [\"36306384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling downstream of CD11c that drives maturation checkpoints not defined\", \"Identity of the bone marrow niche ligand engaging CD11c on preneutrophils unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The intracellular signaling cascades downstream of CD11c engagement — particularly those mediating HSPC survival, neutrophil maturation, and NF-κB activation — remain largely undefined, and the bone marrow niche ligands engaging CD11c on progenitor cells have not been identified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No adapter or kinase cascade mapped downstream of the CD11c cytoplasmic tail\", \"Bone marrow niche counter-receptor for CD11c on HSPCs/preneutrophils unidentified\", \"High-resolution cryo-EM structure of fully ligand-engaged αXβ2 lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 2, 9, 10, 11, 12, 13, 17, 19]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 5, 11, 17, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 4, 5, 13, 15, 16, 21, 23]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [10, 13, 15, 18]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [9, 10, 19]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [22, 23]}\n    ],\n    \"complexes\": [\n      \"αXβ2 integrin (CD11c/CD18)\"\n    ],\n    \"partners\": [\n      \"ITGB2\",\n      \"ICAM1\",\n      \"ICAM2\",\n      \"VCAM1\",\n      \"JAM3\",\n      \"FCER2\",\n      \"LRP1\",\n      \"FABP5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}