{"gene":"CD24","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2019,"finding":"CD24 expressed on tumor cells functions as a 'don't eat me' anti-phagocytic signal by directly binding to Siglec-10 on tumor-associated macrophages, inhibiting macrophage phagocytosis; genetic ablation or antibody blockade of either CD24 or Siglec-10 robustly augments phagocytosis of CD24-expressing tumor cells and reduces tumor growth in vivo.","method":"Genetic ablation (CD24 KO, Siglec-10 KO), monoclonal antibody blockade, in vivo phagocytosis assays, tumor growth models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KO, antibody blockade, in vivo), replicated across multiple tumor types","pmids":["31367043"],"is_preprint":false},{"year":2006,"finding":"CD24 regulates CXCR4 chemokine receptor function; CD24 expression reduces SDF-1-mediated cell migration and CXCR4 signaling by modulating cellular cholesterol levels and CXCR4 lipid raft association.","method":"CD24-knockout mouse B cells, CD24-/- pre-B cell lines, CD24 overexpression in MDA-MB-231 cells, migration assays, lipid raft fractionation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — KO model plus gain-of-function, multiple orthogonal readouts (migration, raft fractionation, signaling)","pmids":["16390867"],"is_preprint":false},{"year":2011,"finding":"Intracellular CD24 in stress granules associates with G3BP (a phosphorylation-dependent endoribonuclease) and inhibits G3BP's RNase activity toward BART mRNA, thereby stabilizing BART mRNA and suppressing cancer cell invasion and metastasis.","method":"Co-immunoprecipitation, stress granule fractionation, RNase activity assay, CD24 knockdown with orthotopic xenograft invasion model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro RNase assay combined with Co-IP and in vivo metastasis model with mechanistic follow-up","pmids":["21266361"],"is_preprint":false},{"year":2015,"finding":"Intracellular CD24 competitively inhibits ARF binding to NPM, resulting in decreased ARF levels, increased MDM2, and decreased p53 and p21/CDKN1A, thereby enabling functional inactivation of p53 by somatic mutation and viral oncogenes (SV40 large T antigen, HPV16 E6).","method":"Targeted mutation and shRNA silencing of CD24, Co-IP, in vitro competition assay, in vivo prostate cancer growth/metastasis models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — competitive binding assay, multiple genetic tools, in vivo validation, mechanistic epistasis established","pmids":["25600590"],"is_preprint":false},{"year":2012,"finding":"HIF-1α transcriptionally activates CD24 expression through a functional hypoxia-responsive element (HRE) in the CD24 promoter; CD24 overexpression rescues the growth/metastasis deficit caused by HIF-1α depletion, placing CD24 downstream of HIF-1α as a critical effector.","method":"ChIP (HIF-1α binding to CD24 promoter), shRNA knockdown of HIF-1α or CD24, HIF-1α overexpression under normoxia, in vivo primary and metastatic tumor growth assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP, epistasis rescue experiment, in vivo models with multiple orthogonal approaches","pmids":["22926560"],"is_preprint":false},{"year":2011,"finding":"CD24 promotes cancer cell invasion through β1-integrin-dependent contractile force generation; CD24-high cells generate 5-fold higher contractile forces than CD24-low cells, and this enhanced invasion is blocked by inhibitors of myosin light chain kinase, Rho kinase, Src kinase, or STAT3.","method":"Stable CD24 transfection/knockdown in A125 lung cancer cells, 3D ECM invasion assays, Fourier transform traction microscopy, pharmacological inhibitors","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — quantitative biophysical assay (traction microscopy) plus multiple pharmacological inhibitors and genetic controls","pmids":["21828044"],"is_preprint":false},{"year":2016,"finding":"CD24 associates with EGFR and inhibits EGFR internalization and degradation in a RhoA-dependent manner in gastric cancer cells, thereby sustaining EGF/EGFR signaling and downstream ERK and Akt phosphorylation.","method":"Co-immunoprecipitation, immunofluorescence, CD24 knockdown/overexpression, RhoA pulldown assay, Western blot, flow cytometry","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus functional assays in a single lab, multiple orthogonal methods but not independently replicated","pmids":["26830684"],"is_preprint":false},{"year":2009,"finding":"CD24 promotes colorectal cancer cell proliferation via activation of ERK1/2, Raf-1, and p38 MAPK signaling; specific inhibitors of ERK1/2 and p38 MAPK abrogate CD24-induced proliferation in vitro and in vivo.","method":"CD24 overexpression/knockdown, pharmacological inhibitors (U0126, SB203580), in vitro proliferation assays, nude mouse tumorigenicity assay","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2-3 — gain-of-function with pharmacological epistasis, in vivo validation, single lab","pmids":["19860845"],"is_preprint":false},{"year":2012,"finding":"CD24 interacts with Lyn (a Src family kinase) as identified by Co-IP; CD24 overexpression activates Lyn and enhances Lyn-ERK1/2 interaction and nuclear translocation of Lyn, driving ERK1/2 activation and colorectal cancer invasion.","method":"Co-immunoprecipitation, immunofluorescence, Lyn inhibitor (PP2), CD24 overexpression/depletion, invasion assay","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP plus functional follow-up, single lab","pmids":["22731636"],"is_preprint":false},{"year":2014,"finding":"CD24 promotes gastric cancer survival and invasion through activation of STAT3; CD24 knockdown induces apoptosis via the mitochondrial apoptotic pathway and reduces invasion, while STAT3 inhibition mimics and extends CD24 knockdown effects.","method":"CD24 knockdown in GC cells, apoptosis assays (flow cytometry, mitochondrial pathway markers), STAT3 inhibitor, in vivo xenograft, clinical tissue analysis","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD with defined phenotypic readout plus in vivo validation, single lab","pmids":["24327257"],"is_preprint":false},{"year":2018,"finding":"SOX2 transcriptionally activates CD24 by binding to its promoter (downstream of STAT3 activation induced by BRAF inhibition); CD24 overexpression in turn activates Src and STAT3, and CD24 knockdown or Src/STAT3 inhibition restores BRAF inhibitor sensitivity in resistant melanoma cells.","method":"Chromatin immunoprecipitation (SOX2 binding to CD24 promoter), shRNA knockdown, CD24 overexpression, STAT3/Src inhibitor treatment, drug resistance assays","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP confirms direct transcriptional regulation, functional rescue experiments, single lab","pmids":["29905375"],"is_preprint":false},{"year":2016,"finding":"GON4L interacts with transcription factor YY1 and promotes its association with the androgen receptor to drive CD24 expression and cancer cell growth; GON4L depletion reduces CD24 expression, cell proliferation in vitro, and tumor xenograft growth in vivo.","method":"shRNA pooled library screen, Co-IP (GON4L-YY1-androgen receptor), CD24 expression assays, cell proliferation, in vivo xenograft","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus functional validation in multiple cancer cell lines, single lab","pmids":["27312530"],"is_preprint":false},{"year":2021,"finding":"Nucleophosmin/B23 (NPM) induces CD24 expression through the Sp1 binding site in the CD24 promoter (transcriptional activation); NPM silencing decreases CD24 surface expression and enhances macrophage phagocytosis of endometrial cancer cells, while restoring CD24 in NPM-silenced cells re-suppresses phagocytosis.","method":"Oligonucleotide microarray, promoter analysis (Sp1 site), NPM silencing, CD24 overexpression rescue, macrophage phagocytosis assay","journal":"Journal of molecular medicine (Berlin, Germany)","confidence":"Medium","confidence_rationale":"Tier 2-3 — promoter dissection plus epistasis rescue in phagocytosis assay, single lab","pmids":["33954835"],"is_preprint":false},{"year":2022,"finding":"The CD24-Siglec-E axis suppresses obesity-related metaflammation; sialylation-dependent recognition of CD24 by Siglec-E induces SHP-1 recruitment, repressing inflammatory signaling and protecting against metabolic syndrome including obesity, dyslipidemia, insulin resistance, and NASH.","method":"Multiple mouse knockout strains (Cd24 KO, Siglec-E KO, combined), CD24Fc treatment, SHP-1 recruitment assays, first-in-human clinical correlation","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models, mechanistic SHP-1 recruitment assay, human clinical data correlation","pmids":["35921817"],"is_preprint":false},{"year":2014,"finding":"Siglec-G on host antigen-presenting cells interacts with CD24 on donor T cells to negatively regulate graft-versus-host disease; enhancing Siglec-G–CD24 interaction with CD24 fusion protein attenuates GVHD severity.","method":"Siglec-G KO and CD24 KO chimeric mouse models, CD24 fusion protein rescue experiments, multiple GVHD mouse models","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — multiple KO models plus rescue with defined fusion protein, mechanistic interaction established in vivo","pmids":["24695850"],"is_preprint":false},{"year":2006,"finding":"CD24 is expressed preferentially by myofiber synaptic nuclei and is required for normal presynaptic maturation and function; CD24 mutant mice exhibit depressed synaptic transmission with complete failure upon repetitive stimulation and aberrant stimulus-dependent AM1-43 uptake from axons.","method":"Microarray screen for synaptic-region genes, CD24 mutant mice, electrophysiology (synaptic transmission), AM1-43 dye uptake assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with direct electrophysiological and live-imaging functional readouts","pmids":["16606832"],"is_preprint":false},{"year":1997,"finding":"CD24 (HSA) is required for normal B-cell development; CD24-deficient mice show a leaky block in B-cell development with reduction in late pre-B and immature B-cell populations in bone marrow, and their erythrocytes show increased aggregation, susceptibility to hypotonic lysis, and reduced half-life in vivo.","method":"Homologous recombination KO mice, flow cytometry of bone marrow populations, erythrocyte osmotic fragility assays, in vivo erythrocyte half-life measurement","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — germline KO with multiple defined cellular phenotype readouts, foundational study","pmids":["9028339"],"is_preprint":false},{"year":2010,"finding":"NFAT5 directly binds to the Cd24 promoter in response to hypertonicity, derepresses local chromatin, and upregulates CD24 mRNA and protein expression; this CD24 induction is required for T cell expansion under osmotic stress.","method":"NFAT5 KO mice, T cell-specific NFAT5 KO, ChIP (NFAT5 binding to Cd24 promoter), chromatin derepression assay, in vitro hypertonicity models, T cell expansion assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — ChIP confirms direct promoter binding, KO mouse validates functional consequence, multiple orthogonal approaches","pmids":["21037089"],"is_preprint":false},{"year":2011,"finding":"NDRG2 negatively regulates CD24 expression in hepatocellular carcinoma; NDRG2 upregulation decreases CD24 expression and reduces cell adhesion, migration and invasion, while NDRG2 knockdown increases CD24 and enhances these behaviors.","method":"Adenovirus-mediated NDRG2 overexpression, siRNA knockdown, Western blot, adhesion/migration/invasion assays, clinical HCC specimens","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 — bidirectional regulation with both gain- and loss-of-function, single lab","pmids":["21676268"],"is_preprint":false},{"year":2021,"finding":"Translocation of CD24 from cytosol to cell membrane is a triggering event for phenotype switching and drug resistance in breast cancer; membrane CD24 upregulation leads to strong continuous p38 MAPK phosphorylation, Bcl-2 overexpression, and cell cycle slowdown enabling drug persistence.","method":"CD24 localization by flow cytometry and imaging, p38 MAPK phosphorylation assays, Bcl-2 expression, p38 inhibitor sensitization experiments","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 — localization linked to functional consequence with pharmacological epistasis, single lab","pmids":["34426608"],"is_preprint":false},{"year":2019,"finding":"CD24 in granulosa cells mediates ovulation by supporting the EGFR-ERK1/2 pathway; hCG stimulation increases CD24 expression in granulosa cells and CD24 is associated with hCG-induced upregulation of prostaglandin synthase and transporter genes.","method":"Single-cell RNAseq of human cumulus cells, hCG stimulation experiments, CD24 functional correlation with EGFR-ERK1/2 pathway and prostaglandin gene expression","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3-4 — correlative single-cell sequencing with limited mechanistic follow-up, single study","pmids":["31624236"],"is_preprint":false},{"year":2015,"finding":"ELF5 transcription factor binds to the ETS cis-element on the proximal CD24 promoter and upregulates CD24 expression; CD24 knockdown in ELF5-overexpressing breast cancer cells restores cell proliferation, migration, and invasion, placing CD24 downstream of ELF5 as an effector.","method":"ChIP-seq (ELF5 binding to CD24 promoter), CD24 knockdown, ELF5 overexpression, proliferation/migration/invasion assays","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq confirms direct binding, epistasis rescue experiment, single lab","pmids":["34146197"],"is_preprint":false},{"year":2019,"finding":"Heparanase upregulates CD24 expression (independent of its enzymatic activity, as a splice variant lacking enzymatic activity also increases CD24), and CD24 promotes glioma cell migration, invasion, colony formation, and tumor growth via the L1CAM ligand axis.","method":"Tet-on inducible heparanase expression, gene array, heparanase gene silencing, CD24 overexpression, anti-CD24 and anti-L1CAM neutralizing antibodies, mouse glioma tumor models","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 — inducible system with enzymatically inactive splice variant control, in vivo validation, single lab","pmids":["31032901"],"is_preprint":false},{"year":2019,"finding":"CD24 downregulation suppresses bone metastasis of lung cancer cells by reducing anchorage-independent growth and cancer cell tropism to bone; add-back of CD24 rescues the metastasis deficit, confirming a direct causal role.","method":"CD24 knockdown with add-back rescue, intracardiac injection mouse model, in vivo near-infrared imaging (iRFP720), cell adhesion assays, colony formation assay","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 — KD plus add-back rescue with in vivo imaging, mechanistic specificity established","pmids":["29095550"],"is_preprint":false},{"year":2015,"finding":"Dynamic upregulation of CD24 during early adipogenesis is necessary for differentiation; siRNA-mediated CD24 knockdown results in fewer mature lipid-laden adipocytes and decreased expression of mature adipogenic genes, and CD24 expression is driven by increased promoter activity in response to cAMP or dexamethasone.","method":"siRNA knockdown, CD24 promoter activity assay (transient transfection), 3T3-L1 and primary pre-adipocyte differentiation assays, RT-qPCR, Western blot","journal":"Adipocyte","confidence":"Medium","confidence_rationale":"Tier 2-3 — loss-of-function with defined differentiation phenotype plus promoter activity assay, single lab","pmids":["26167413"],"is_preprint":false},{"year":2019,"finding":"CD24 downregulation in hippocampal astrocytes suppresses SHP2 (SHP-2/PTPN11) phosphorylation and reduces BDNF levels, impairing hippocampal neurogenesis and cognitive function after traumatic brain injury; conversely, TBI-induced elevation of CD24 positively supports neurogenesis.","method":"Lentiviral CD24 knockdown in astrocytes, Transwell co-culture with neurons, Western blot (SHP2 phosphorylation, BDNF), DCX immunofluorescence, Morris water maze cognitive testing","journal":"The Journal of surgical research","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD with multiple molecular and behavioral readouts, single lab","pmids":["31421380"],"is_preprint":false}],"current_model":"CD24 is a GPI-anchored sialoglycoprotein that functions as an innate immune checkpoint by binding Siglec-10/Siglec-G/Siglec-E on macrophages or other immune cells to suppress phagocytosis and inflammation (via SHP-1 recruitment); on cancer cells it also promotes invasion and metastasis through β1-integrin-mediated contractile forces, modulation of CXCR4 lipid raft association, EGFR stabilization via RhoA, and activation of Src-Lyn-ERK/STAT3 signaling cascades; intracellular CD24 additionally regulates p53 tumor suppression by competitively displacing ARF from NPM (increasing MDM2 and degrading p53) and stabilizes BART mRNA by inhibiting G3BP RNase activity; its transcription is directly activated by HIF-1α (via HRE), NFAT5 (osmotic stress), SOX2/STAT3, ELF5, NPM/B23 (via Sp1), and GON4L-YY1-androgen receptor, placing CD24 at a convergence of oncogenic, immunological, and developmental signaling networks."},"narrative":{"teleology":[{"year":1997,"claim":"The first loss-of-function model established that CD24 is required for normal B-cell development and erythrocyte membrane integrity, revealing non-redundant roles in hematopoietic lineages.","evidence":"Germline CD24-knockout mice analyzed by flow cytometry for bone marrow B-cell populations and erythrocyte osmotic fragility assays","pmids":["9028339"],"confidence":"High","gaps":["Molecular mechanism by which CD24 supports late pre-B to immature B-cell transition unknown","No signaling partners identified in hematopoietic cells at this stage"]},{"year":2006,"claim":"CD24 was shown to modulate chemokine receptor function by altering lipid raft cholesterol and CXCR4 partitioning, establishing its role as a regulator of membrane microdomain organization rather than a classical signaling receptor.","evidence":"CD24-knockout mouse B cells and CD24 overexpression in MDA-MB-231 cells with lipid raft fractionation and SDF-1 migration assays","pmids":["16390867"],"confidence":"High","gaps":["Mechanism of cholesterol modulation by a GPI-anchored protein not resolved","Whether raft regulation extends to receptors beyond CXCR4 untested"]},{"year":2006,"claim":"CD24 was found to be required for presynaptic maturation at the neuromuscular junction, extending its functional repertoire beyond the immune system to synaptic biology.","evidence":"CD24 mutant mice subjected to electrophysiology and AM1-43 dye uptake at neuromuscular junctions","pmids":["16606832"],"confidence":"High","gaps":["Trans-synaptic binding partner on motor neurons not identified","Whether CD24 signals through Siglec-family receptors at synapses unknown"]},{"year":2009,"claim":"CD24 was linked to direct activation of MAPK cascades (ERK1/2, Raf-1, p38) in colorectal cancer, establishing a mitogenic signaling axis downstream of CD24.","evidence":"CD24 overexpression/knockdown in colorectal cancer cells with pharmacological MAPK inhibitors and nude mouse tumorigenicity","pmids":["19860845"],"confidence":"Medium","gaps":["Proximal kinase or adaptor linking GPI-anchored CD24 to MAPK not identified","Single-lab study without independent replication"]},{"year":2010,"claim":"NFAT5 was identified as a direct transcriptional activator of CD24 under osmotic stress, establishing the first defined transcription factor–promoter interaction for CD24 and linking it to T-cell adaptation to hypertonic environments.","evidence":"ChIP for NFAT5 on CD24 promoter in NFAT5-KO and T-cell-specific KO mice under hypertonicity","pmids":["21037089"],"confidence":"High","gaps":["Whether NFAT5-driven CD24 contributes to renal medullary cell survival untested","Chromatin derepression mechanism not molecularly dissected"]},{"year":2011,"claim":"Two parallel mechanisms were uncovered: intracellular CD24 inhibits G3BP RNase activity to stabilize BART mRNA in stress granules, and surface CD24 drives β1-integrin-dependent contractile forces via Src/STAT3/MLCK/ROCK for cancer cell invasion.","evidence":"Co-IP and RNase activity assay for G3BP interaction; Fourier transform traction microscopy with pharmacological inhibitors for contractile forces","pmids":["21266361","21828044"],"confidence":"High","gaps":["Full spectrum of G3BP target mRNAs regulated by CD24 unknown","Whether intracellular and surface CD24 functions are coordinately regulated not addressed"]},{"year":2012,"claim":"HIF-1α was shown to directly transactivate CD24 via a promoter HRE, and CD24 was identified as the critical effector rescuing HIF-1α-dependent tumor growth and metastasis, placing CD24 in the hypoxia response pathway. Simultaneously, CD24 was found to physically interact with and activate Lyn kinase, linking it to nuclear ERK1/2 signaling.","evidence":"ChIP for HIF-1α on CD24 promoter with epistasis rescue in vivo; Co-IP for CD24–Lyn interaction with Lyn inhibitor PP2","pmids":["22926560","22731636"],"confidence":"High","gaps":["Whether HIF-1α–CD24 axis operates in non-tumor hypoxic tissues untested","Lyn interaction identified by single Co-IP without reciprocal validation"]},{"year":2014,"claim":"The Siglec-G–CD24 axis was established as a negative regulator of graft-versus-host disease, while intracellular CD24 was shown to inactivate p53 by competitively displacing ARF from NPM, revealing dual immune-checkpoint and tumor-suppressor-antagonist functions.","evidence":"Siglec-G/CD24 double-KO GVHD models with CD24Fc rescue; Co-IP and competition assay for ARF–NPM displacement with in vivo prostate cancer models","pmids":["24695850","25600590"],"confidence":"High","gaps":["Structural basis of CD24–NPM interaction unknown","Whether ARF displacement operates in normal (non-transformed) cells not tested"]},{"year":2015,"claim":"ELF5 was identified as a direct transcriptional activator of CD24 via an ETS element, and CD24 was shown to be required for early adipocyte differentiation, expanding its developmental roles beyond hematopoiesis.","evidence":"ChIP-seq for ELF5 binding to CD24 promoter with epistasis knockdown; siRNA knockdown during 3T3-L1 adipogenesis with promoter activity assays","pmids":["34146197","26167413"],"confidence":"Medium","gaps":["Downstream adipogenic signals activated by CD24 not identified","ELF5–CD24 axis not validated outside breast cancer cells"]},{"year":2016,"claim":"CD24 was found to stabilize EGFR at the cell surface through RhoA-dependent inhibition of receptor internalization, and GON4L–YY1–androgen receptor was identified as another transcriptional activator complex driving CD24 expression.","evidence":"Co-IP for CD24–EGFR and RhoA pulldown in gastric cancer cells; Co-IP for GON4L–YY1–AR with shRNA screen and in vivo xenograft","pmids":["26830684","27312530"],"confidence":"Medium","gaps":["Whether RhoA-dependent EGFR stabilization is specific to gastric cancer untested","GON4L–YY1 regulation of CD24 not confirmed by ChIP"]},{"year":2018,"claim":"SOX2 was shown to directly transactivate CD24 downstream of STAT3 in BRAF-inhibitor-resistant melanoma, and CD24 in turn activated Src/STAT3, establishing a positive feedback loop driving drug resistance.","evidence":"ChIP for SOX2 on CD24 promoter with shRNA knockdown and drug resistance assays","pmids":["29905375"],"confidence":"Medium","gaps":["Whether this feedback loop operates in BRAF-wild-type tumors unknown","Mechanism by which surface CD24 activates Src not resolved"]},{"year":2019,"claim":"CD24 was established as a dominant anti-phagocytic 'don't eat me' signal on tumor cells through Siglec-10 engagement, with genetic ablation or antibody blockade markedly enhancing macrophage phagocytosis and reducing tumor growth in vivo.","evidence":"CD24-KO and Siglec-10-KO tumor cells, monoclonal antibody blockade, in vivo tumor growth models across multiple cancer types","pmids":["31367043"],"confidence":"High","gaps":["Relative contribution of CD24 versus CD47 as anti-phagocytic signals varies by tumor type and is incompletely defined","Therapeutic window for CD24 blockade in humans unknown"]},{"year":2021,"claim":"NPM was shown to transcriptionally induce CD24 through an Sp1 site, with CD24 surface expression being the functional mediator of NPM-driven phagocytosis evasion, and CD24 translocation from cytosol to membrane was linked to phenotype switching and drug persistence in breast cancer.","evidence":"NPM silencing with CD24 rescue in phagocytosis assays; flow cytometry and imaging of CD24 localization with p38 MAPK phosphorylation readouts","pmids":["33954835","34426608"],"confidence":"Medium","gaps":["Mechanism controlling CD24 intracellular-to-membrane translocation not identified","Whether NPM–Sp1–CD24 axis extends beyond endometrial cancer untested"]},{"year":2022,"claim":"The CD24–Siglec-E axis was extended beyond tumor immunity to metabolic inflammation, demonstrating sialylation-dependent SHP-1 recruitment that suppresses obesity-related metaflammation and protects against metabolic syndrome.","evidence":"Cd24-KO, Siglec-E-KO, and double-KO mice with CD24Fc treatment, SHP-1 recruitment assays, human clinical correlation","pmids":["35921817"],"confidence":"High","gaps":["Cell type(s) presenting CD24 to tissue macrophages in adipose tissue not definitively identified","Whether CD24Fc therapeutic benefit is mediated solely through Siglec engagement or additional receptors unknown"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of the CD24–Siglec and CD24–NPM interactions; the mechanism by which a GPI-anchored protein activates intracellular Src-family kinases; how CD24 partitions between intracellular (stress granule/NPM-associated) and surface (anti-phagocytic/signaling) pools; and whether the diverse CD24 functions in immunity, metabolism, and neural synaptic maturation share common downstream signaling intermediates.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of CD24 or CD24–Siglec complex","Mechanism coupling GPI anchor to cytoplasmic kinase activation unresolved","Relative physiological importance of intracellular versus surface CD24 pools undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,3,6,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,13,14]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,6,13,19]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,3,19]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,13,14,16,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,7,8,9,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3,4,10,23]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,9]}],"complexes":[],"partners":["SIGLEC10","SIGLEC-G","NPM1","G3BP1","LYN","EGFR","CXCR4","YY1"],"other_free_text":[]},"mechanistic_narrative":"CD24 is a GPI-anchored sialoglycoprotein that serves as an innate immune checkpoint, a regulator of intracellular tumor suppressor pathways, and a modulator of cell signaling across immune, neural, and metabolic contexts. On the cell surface, CD24 engages Siglec-family receptors (Siglec-10, Siglec-G, Siglec-E) on macrophages and antigen-presenting cells to recruit SHP-1 and suppress phagocytosis and inflammatory signaling, thereby functioning as a \"don't eat me\" signal on tumor cells and a negative regulator of metaflammation and graft-versus-host disease [PMID:31367043, PMID:35921817, PMID:24695850]. Intracellularly, CD24 competitively displaces ARF from nucleophosmin (NPM), leading to MDM2-dependent p53 degradation, and also inhibits G3BP endoribonuclease activity to stabilize BART mRNA in stress granules [PMID:25600590, PMID:21266361]. CD24 promotes cancer cell invasion and proliferation through β1-integrin-dependent contractile force generation, Src/Lyn–ERK/STAT3 signaling, EGFR stabilization via RhoA, and modulation of CXCR4 lipid raft association, and its transcription is directly activated by HIF-1α, SOX2/STAT3, NFAT5, ELF5, and NPM/Sp1 [PMID:21828044, PMID:22731636, PMID:26830684, PMID:16390867, PMID:22926560, PMID:29905375, PMID:21037089]."},"prefetch_data":{"uniprot":{"accession":"P25063","full_name":"Signal transducer CD24","aliases":["Small cell lung carcinoma cluster 4 antigen"],"length_aa":80,"mass_kda":8.1,"function":"May have a pivotal role in cell differentiation of different cell types. Signaling could be triggered by the binding of a lectin-like ligand to the CD24 carbohydrates, and transduced by the release of second messengers derived from the GPI-anchor. Modulates B-cell activation responses. Promotes AG-dependent proliferation of B-cells, and prevents their terminal differentiation into antibody-forming cells (PubMed:11313396). In association with SIGLEC10 may be involved in the selective suppression of the immune response to danger-associated molecular patterns (DAMPs) such as HMGB1, HSP70 and HSP90. Plays a role in the control of autoimmunity (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P25063/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CD24","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":74,"dependency_fraction":0.05405405405405406},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CD24","total_profiled":1310},"omim":[{"mim_id":"618590","title":"NEURODEVELOPMENTAL DISORDER WITH BRAIN ANOMALIES, SEIZURES, AND SCOLIOSIS; NEDBSS","url":"https://www.omim.org/entry/618590"},{"mim_id":"617816","title":"GLYCOSYLPHOSPHATIDYLINOSITOL BIOSYNTHESIS DEFECT 16; GPIBD16","url":"https://www.omim.org/entry/617816"},{"mim_id":"617810","title":"GLYCOSYLPHOSPHATIDYLINOSITOL BIOSYNTHESIS DEFECT 15; 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cells.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27374087","citation_count":15,"is_preprint":false},{"pmid":"34146197","id":"PMC_34146197","title":"ELF5 inhibits the proliferation and invasion of breast cancer cells by regulating CD24.","date":"2021","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/34146197","citation_count":15,"is_preprint":false},{"pmid":"27332878","id":"PMC_27332878","title":"CD90 and CD24 Co-Expression Is Associated with Pancreatic Intraepithelial Neoplasias.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/27332878","citation_count":14,"is_preprint":false},{"pmid":"31054360","id":"PMC_31054360","title":"Investigation of CD133 and CD24 as candidate azoospermia markers and their relationship with spermatogenesis defects.","date":"2019","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/31054360","citation_count":14,"is_preprint":false},{"pmid":"35289116","id":"PMC_35289116","title":"CD24 is a surrogate for 'immune-cold' phenotype in aggressive large B-cell lymphoma.","date":"2022","source":"The journal of pathology. Clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/35289116","citation_count":14,"is_preprint":false},{"pmid":"33954835","id":"PMC_33954835","title":"Nucleophosmin/B23 promotes endometrial cancer cell escape from macrophage phagocytosis by increasing CD24 expression.","date":"2021","source":"Journal of molecular medicine (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/33954835","citation_count":14,"is_preprint":false},{"pmid":"20230526","id":"PMC_20230526","title":"CD24 Ala57Val gene polymorphism and the risk of systemic lupus erythematosus.","date":"2010","source":"Tissue antigens","url":"https://pubmed.ncbi.nlm.nih.gov/20230526","citation_count":14,"is_preprint":false},{"pmid":"38203250","id":"PMC_38203250","title":"Inhaled CD24-Enriched Exosomes (EXO-CD24) as a Novel Immune Modulator in Respiratory Disease.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38203250","citation_count":13,"is_preprint":false},{"pmid":"21815873","id":"PMC_21815873","title":"Investigation of CD24 and its expression in Iranian relapsing-remitting multiple sclerosis.","date":"2011","source":"The International journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/21815873","citation_count":13,"is_preprint":false},{"pmid":"29693159","id":"PMC_29693159","title":"Effect of curcumin on the cell surface markers CD44 and CD24 in breast cancer.","date":"2018","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/29693159","citation_count":13,"is_preprint":false},{"pmid":"25976705","id":"PMC_25976705","title":"Effects of paracrine factors on CD24 expression and neural differentiation of male germline stem cells.","date":"2015","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25976705","citation_count":13,"is_preprint":false},{"pmid":"35028047","id":"PMC_35028047","title":"A pilot study on biological characteristics of human CD24(+) stem cells from the apical papilla.","date":"2021","source":"Journal of dental sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35028047","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48613,"output_tokens":6014,"usd":0.118025},"stage2":{"model":"claude-opus-4-6","input_tokens":9651,"output_tokens":3780,"usd":0.214133},"total_usd":0.332158,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"CD24 expressed on tumor cells functions as a 'don't eat me' anti-phagocytic signal by directly binding to Siglec-10 on tumor-associated macrophages, inhibiting macrophage phagocytosis; genetic ablation or antibody blockade of either CD24 or Siglec-10 robustly augments phagocytosis of CD24-expressing tumor cells and reduces tumor growth in vivo.\",\n      \"method\": \"Genetic ablation (CD24 KO, Siglec-10 KO), monoclonal antibody blockade, in vivo phagocytosis assays, tumor growth models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO, antibody blockade, in vivo), replicated across multiple tumor types\",\n      \"pmids\": [\"31367043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CD24 regulates CXCR4 chemokine receptor function; CD24 expression reduces SDF-1-mediated cell migration and CXCR4 signaling by modulating cellular cholesterol levels and CXCR4 lipid raft association.\",\n      \"method\": \"CD24-knockout mouse B cells, CD24-/- pre-B cell lines, CD24 overexpression in MDA-MB-231 cells, migration assays, lipid raft fractionation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model plus gain-of-function, multiple orthogonal readouts (migration, raft fractionation, signaling)\",\n      \"pmids\": [\"16390867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Intracellular CD24 in stress granules associates with G3BP (a phosphorylation-dependent endoribonuclease) and inhibits G3BP's RNase activity toward BART mRNA, thereby stabilizing BART mRNA and suppressing cancer cell invasion and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, stress granule fractionation, RNase activity assay, CD24 knockdown with orthotopic xenograft invasion model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro RNase assay combined with Co-IP and in vivo metastasis model with mechanistic follow-up\",\n      \"pmids\": [\"21266361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Intracellular CD24 competitively inhibits ARF binding to NPM, resulting in decreased ARF levels, increased MDM2, and decreased p53 and p21/CDKN1A, thereby enabling functional inactivation of p53 by somatic mutation and viral oncogenes (SV40 large T antigen, HPV16 E6).\",\n      \"method\": \"Targeted mutation and shRNA silencing of CD24, Co-IP, in vitro competition assay, in vivo prostate cancer growth/metastasis models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — competitive binding assay, multiple genetic tools, in vivo validation, mechanistic epistasis established\",\n      \"pmids\": [\"25600590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HIF-1α transcriptionally activates CD24 expression through a functional hypoxia-responsive element (HRE) in the CD24 promoter; CD24 overexpression rescues the growth/metastasis deficit caused by HIF-1α depletion, placing CD24 downstream of HIF-1α as a critical effector.\",\n      \"method\": \"ChIP (HIF-1α binding to CD24 promoter), shRNA knockdown of HIF-1α or CD24, HIF-1α overexpression under normoxia, in vivo primary and metastatic tumor growth assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP, epistasis rescue experiment, in vivo models with multiple orthogonal approaches\",\n      \"pmids\": [\"22926560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CD24 promotes cancer cell invasion through β1-integrin-dependent contractile force generation; CD24-high cells generate 5-fold higher contractile forces than CD24-low cells, and this enhanced invasion is blocked by inhibitors of myosin light chain kinase, Rho kinase, Src kinase, or STAT3.\",\n      \"method\": \"Stable CD24 transfection/knockdown in A125 lung cancer cells, 3D ECM invasion assays, Fourier transform traction microscopy, pharmacological inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — quantitative biophysical assay (traction microscopy) plus multiple pharmacological inhibitors and genetic controls\",\n      \"pmids\": [\"21828044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CD24 associates with EGFR and inhibits EGFR internalization and degradation in a RhoA-dependent manner in gastric cancer cells, thereby sustaining EGF/EGFR signaling and downstream ERK and Akt phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, CD24 knockdown/overexpression, RhoA pulldown assay, Western blot, flow cytometry\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus functional assays in a single lab, multiple orthogonal methods but not independently replicated\",\n      \"pmids\": [\"26830684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CD24 promotes colorectal cancer cell proliferation via activation of ERK1/2, Raf-1, and p38 MAPK signaling; specific inhibitors of ERK1/2 and p38 MAPK abrogate CD24-induced proliferation in vitro and in vivo.\",\n      \"method\": \"CD24 overexpression/knockdown, pharmacological inhibitors (U0126, SB203580), in vitro proliferation assays, nude mouse tumorigenicity assay\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — gain-of-function with pharmacological epistasis, in vivo validation, single lab\",\n      \"pmids\": [\"19860845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CD24 interacts with Lyn (a Src family kinase) as identified by Co-IP; CD24 overexpression activates Lyn and enhances Lyn-ERK1/2 interaction and nuclear translocation of Lyn, driving ERK1/2 activation and colorectal cancer invasion.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, Lyn inhibitor (PP2), CD24 overexpression/depletion, invasion assay\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP plus functional follow-up, single lab\",\n      \"pmids\": [\"22731636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CD24 promotes gastric cancer survival and invasion through activation of STAT3; CD24 knockdown induces apoptosis via the mitochondrial apoptotic pathway and reduces invasion, while STAT3 inhibition mimics and extends CD24 knockdown effects.\",\n      \"method\": \"CD24 knockdown in GC cells, apoptosis assays (flow cytometry, mitochondrial pathway markers), STAT3 inhibitor, in vivo xenograft, clinical tissue analysis\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD with defined phenotypic readout plus in vivo validation, single lab\",\n      \"pmids\": [\"24327257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOX2 transcriptionally activates CD24 by binding to its promoter (downstream of STAT3 activation induced by BRAF inhibition); CD24 overexpression in turn activates Src and STAT3, and CD24 knockdown or Src/STAT3 inhibition restores BRAF inhibitor sensitivity in resistant melanoma cells.\",\n      \"method\": \"Chromatin immunoprecipitation (SOX2 binding to CD24 promoter), shRNA knockdown, CD24 overexpression, STAT3/Src inhibitor treatment, drug resistance assays\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirms direct transcriptional regulation, functional rescue experiments, single lab\",\n      \"pmids\": [\"29905375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GON4L interacts with transcription factor YY1 and promotes its association with the androgen receptor to drive CD24 expression and cancer cell growth; GON4L depletion reduces CD24 expression, cell proliferation in vitro, and tumor xenograft growth in vivo.\",\n      \"method\": \"shRNA pooled library screen, Co-IP (GON4L-YY1-androgen receptor), CD24 expression assays, cell proliferation, in vivo xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus functional validation in multiple cancer cell lines, single lab\",\n      \"pmids\": [\"27312530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nucleophosmin/B23 (NPM) induces CD24 expression through the Sp1 binding site in the CD24 promoter (transcriptional activation); NPM silencing decreases CD24 surface expression and enhances macrophage phagocytosis of endometrial cancer cells, while restoring CD24 in NPM-silenced cells re-suppresses phagocytosis.\",\n      \"method\": \"Oligonucleotide microarray, promoter analysis (Sp1 site), NPM silencing, CD24 overexpression rescue, macrophage phagocytosis assay\",\n      \"journal\": \"Journal of molecular medicine (Berlin, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — promoter dissection plus epistasis rescue in phagocytosis assay, single lab\",\n      \"pmids\": [\"33954835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The CD24-Siglec-E axis suppresses obesity-related metaflammation; sialylation-dependent recognition of CD24 by Siglec-E induces SHP-1 recruitment, repressing inflammatory signaling and protecting against metabolic syndrome including obesity, dyslipidemia, insulin resistance, and NASH.\",\n      \"method\": \"Multiple mouse knockout strains (Cd24 KO, Siglec-E KO, combined), CD24Fc treatment, SHP-1 recruitment assays, first-in-human clinical correlation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models, mechanistic SHP-1 recruitment assay, human clinical data correlation\",\n      \"pmids\": [\"35921817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Siglec-G on host antigen-presenting cells interacts with CD24 on donor T cells to negatively regulate graft-versus-host disease; enhancing Siglec-G–CD24 interaction with CD24 fusion protein attenuates GVHD severity.\",\n      \"method\": \"Siglec-G KO and CD24 KO chimeric mouse models, CD24 fusion protein rescue experiments, multiple GVHD mouse models\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple KO models plus rescue with defined fusion protein, mechanistic interaction established in vivo\",\n      \"pmids\": [\"24695850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CD24 is expressed preferentially by myofiber synaptic nuclei and is required for normal presynaptic maturation and function; CD24 mutant mice exhibit depressed synaptic transmission with complete failure upon repetitive stimulation and aberrant stimulus-dependent AM1-43 uptake from axons.\",\n      \"method\": \"Microarray screen for synaptic-region genes, CD24 mutant mice, electrophysiology (synaptic transmission), AM1-43 dye uptake assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with direct electrophysiological and live-imaging functional readouts\",\n      \"pmids\": [\"16606832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CD24 (HSA) is required for normal B-cell development; CD24-deficient mice show a leaky block in B-cell development with reduction in late pre-B and immature B-cell populations in bone marrow, and their erythrocytes show increased aggregation, susceptibility to hypotonic lysis, and reduced half-life in vivo.\",\n      \"method\": \"Homologous recombination KO mice, flow cytometry of bone marrow populations, erythrocyte osmotic fragility assays, in vivo erythrocyte half-life measurement\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — germline KO with multiple defined cellular phenotype readouts, foundational study\",\n      \"pmids\": [\"9028339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NFAT5 directly binds to the Cd24 promoter in response to hypertonicity, derepresses local chromatin, and upregulates CD24 mRNA and protein expression; this CD24 induction is required for T cell expansion under osmotic stress.\",\n      \"method\": \"NFAT5 KO mice, T cell-specific NFAT5 KO, ChIP (NFAT5 binding to Cd24 promoter), chromatin derepression assay, in vitro hypertonicity models, T cell expansion assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirms direct promoter binding, KO mouse validates functional consequence, multiple orthogonal approaches\",\n      \"pmids\": [\"21037089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NDRG2 negatively regulates CD24 expression in hepatocellular carcinoma; NDRG2 upregulation decreases CD24 expression and reduces cell adhesion, migration and invasion, while NDRG2 knockdown increases CD24 and enhances these behaviors.\",\n      \"method\": \"Adenovirus-mediated NDRG2 overexpression, siRNA knockdown, Western blot, adhesion/migration/invasion assays, clinical HCC specimens\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — bidirectional regulation with both gain- and loss-of-function, single lab\",\n      \"pmids\": [\"21676268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Translocation of CD24 from cytosol to cell membrane is a triggering event for phenotype switching and drug resistance in breast cancer; membrane CD24 upregulation leads to strong continuous p38 MAPK phosphorylation, Bcl-2 overexpression, and cell cycle slowdown enabling drug persistence.\",\n      \"method\": \"CD24 localization by flow cytometry and imaging, p38 MAPK phosphorylation assays, Bcl-2 expression, p38 inhibitor sensitization experiments\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization linked to functional consequence with pharmacological epistasis, single lab\",\n      \"pmids\": [\"34426608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD24 in granulosa cells mediates ovulation by supporting the EGFR-ERK1/2 pathway; hCG stimulation increases CD24 expression in granulosa cells and CD24 is associated with hCG-induced upregulation of prostaglandin synthase and transporter genes.\",\n      \"method\": \"Single-cell RNAseq of human cumulus cells, hCG stimulation experiments, CD24 functional correlation with EGFR-ERK1/2 pathway and prostaglandin gene expression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 — correlative single-cell sequencing with limited mechanistic follow-up, single study\",\n      \"pmids\": [\"31624236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ELF5 transcription factor binds to the ETS cis-element on the proximal CD24 promoter and upregulates CD24 expression; CD24 knockdown in ELF5-overexpressing breast cancer cells restores cell proliferation, migration, and invasion, placing CD24 downstream of ELF5 as an effector.\",\n      \"method\": \"ChIP-seq (ELF5 binding to CD24 promoter), CD24 knockdown, ELF5 overexpression, proliferation/migration/invasion assays\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq confirms direct binding, epistasis rescue experiment, single lab\",\n      \"pmids\": [\"34146197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Heparanase upregulates CD24 expression (independent of its enzymatic activity, as a splice variant lacking enzymatic activity also increases CD24), and CD24 promotes glioma cell migration, invasion, colony formation, and tumor growth via the L1CAM ligand axis.\",\n      \"method\": \"Tet-on inducible heparanase expression, gene array, heparanase gene silencing, CD24 overexpression, anti-CD24 and anti-L1CAM neutralizing antibodies, mouse glioma tumor models\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — inducible system with enzymatically inactive splice variant control, in vivo validation, single lab\",\n      \"pmids\": [\"31032901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD24 downregulation suppresses bone metastasis of lung cancer cells by reducing anchorage-independent growth and cancer cell tropism to bone; add-back of CD24 rescues the metastasis deficit, confirming a direct causal role.\",\n      \"method\": \"CD24 knockdown with add-back rescue, intracardiac injection mouse model, in vivo near-infrared imaging (iRFP720), cell adhesion assays, colony formation assay\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD plus add-back rescue with in vivo imaging, mechanistic specificity established\",\n      \"pmids\": [\"29095550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dynamic upregulation of CD24 during early adipogenesis is necessary for differentiation; siRNA-mediated CD24 knockdown results in fewer mature lipid-laden adipocytes and decreased expression of mature adipogenic genes, and CD24 expression is driven by increased promoter activity in response to cAMP or dexamethasone.\",\n      \"method\": \"siRNA knockdown, CD24 promoter activity assay (transient transfection), 3T3-L1 and primary pre-adipocyte differentiation assays, RT-qPCR, Western blot\",\n      \"journal\": \"Adipocyte\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — loss-of-function with defined differentiation phenotype plus promoter activity assay, single lab\",\n      \"pmids\": [\"26167413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD24 downregulation in hippocampal astrocytes suppresses SHP2 (SHP-2/PTPN11) phosphorylation and reduces BDNF levels, impairing hippocampal neurogenesis and cognitive function after traumatic brain injury; conversely, TBI-induced elevation of CD24 positively supports neurogenesis.\",\n      \"method\": \"Lentiviral CD24 knockdown in astrocytes, Transwell co-culture with neurons, Western blot (SHP2 phosphorylation, BDNF), DCX immunofluorescence, Morris water maze cognitive testing\",\n      \"journal\": \"The Journal of surgical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD with multiple molecular and behavioral readouts, single lab\",\n      \"pmids\": [\"31421380\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CD24 is a GPI-anchored sialoglycoprotein that functions as an innate immune checkpoint by binding Siglec-10/Siglec-G/Siglec-E on macrophages or other immune cells to suppress phagocytosis and inflammation (via SHP-1 recruitment); on cancer cells it also promotes invasion and metastasis through β1-integrin-mediated contractile forces, modulation of CXCR4 lipid raft association, EGFR stabilization via RhoA, and activation of Src-Lyn-ERK/STAT3 signaling cascades; intracellular CD24 additionally regulates p53 tumor suppression by competitively displacing ARF from NPM (increasing MDM2 and degrading p53) and stabilizes BART mRNA by inhibiting G3BP RNase activity; its transcription is directly activated by HIF-1α (via HRE), NFAT5 (osmotic stress), SOX2/STAT3, ELF5, NPM/B23 (via Sp1), and GON4L-YY1-androgen receptor, placing CD24 at a convergence of oncogenic, immunological, and developmental signaling networks.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CD24 is a GPI-anchored sialoglycoprotein that serves as an innate immune checkpoint, a regulator of intracellular tumor suppressor pathways, and a modulator of cell signaling across immune, neural, and metabolic contexts. On the cell surface, CD24 engages Siglec-family receptors (Siglec-10, Siglec-G, Siglec-E) on macrophages and antigen-presenting cells to recruit SHP-1 and suppress phagocytosis and inflammatory signaling, thereby functioning as a \\\"don't eat me\\\" signal on tumor cells and a negative regulator of metaflammation and graft-versus-host disease [PMID:31367043, PMID:35921817, PMID:24695850]. Intracellularly, CD24 competitively displaces ARF from nucleophosmin (NPM), leading to MDM2-dependent p53 degradation, and also inhibits G3BP endoribonuclease activity to stabilize BART mRNA in stress granules [PMID:25600590, PMID:21266361]. CD24 promotes cancer cell invasion and proliferation through β1-integrin-dependent contractile force generation, Src/Lyn–ERK/STAT3 signaling, EGFR stabilization via RhoA, and modulation of CXCR4 lipid raft association, and its transcription is directly activated by HIF-1α, SOX2/STAT3, NFAT5, ELF5, and NPM/Sp1 [PMID:21828044, PMID:22731636, PMID:26830684, PMID:16390867, PMID:22926560, PMID:29905375, PMID:21037089].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"The first loss-of-function model established that CD24 is required for normal B-cell development and erythrocyte membrane integrity, revealing non-redundant roles in hematopoietic lineages.\",\n      \"evidence\": \"Germline CD24-knockout mice analyzed by flow cytometry for bone marrow B-cell populations and erythrocyte osmotic fragility assays\",\n      \"pmids\": [\"9028339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which CD24 supports late pre-B to immature B-cell transition unknown\", \"No signaling partners identified in hematopoietic cells at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"CD24 was shown to modulate chemokine receptor function by altering lipid raft cholesterol and CXCR4 partitioning, establishing its role as a regulator of membrane microdomain organization rather than a classical signaling receptor.\",\n      \"evidence\": \"CD24-knockout mouse B cells and CD24 overexpression in MDA-MB-231 cells with lipid raft fractionation and SDF-1 migration assays\",\n      \"pmids\": [\"16390867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cholesterol modulation by a GPI-anchored protein not resolved\", \"Whether raft regulation extends to receptors beyond CXCR4 untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"CD24 was found to be required for presynaptic maturation at the neuromuscular junction, extending its functional repertoire beyond the immune system to synaptic biology.\",\n      \"evidence\": \"CD24 mutant mice subjected to electrophysiology and AM1-43 dye uptake at neuromuscular junctions\",\n      \"pmids\": [\"16606832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trans-synaptic binding partner on motor neurons not identified\", \"Whether CD24 signals through Siglec-family receptors at synapses unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"CD24 was linked to direct activation of MAPK cascades (ERK1/2, Raf-1, p38) in colorectal cancer, establishing a mitogenic signaling axis downstream of CD24.\",\n      \"evidence\": \"CD24 overexpression/knockdown in colorectal cancer cells with pharmacological MAPK inhibitors and nude mouse tumorigenicity\",\n      \"pmids\": [\"19860845\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Proximal kinase or adaptor linking GPI-anchored CD24 to MAPK not identified\", \"Single-lab study without independent replication\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"NFAT5 was identified as a direct transcriptional activator of CD24 under osmotic stress, establishing the first defined transcription factor–promoter interaction for CD24 and linking it to T-cell adaptation to hypertonic environments.\",\n      \"evidence\": \"ChIP for NFAT5 on CD24 promoter in NFAT5-KO and T-cell-specific KO mice under hypertonicity\",\n      \"pmids\": [\"21037089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NFAT5-driven CD24 contributes to renal medullary cell survival untested\", \"Chromatin derepression mechanism not molecularly dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Two parallel mechanisms were uncovered: intracellular CD24 inhibits G3BP RNase activity to stabilize BART mRNA in stress granules, and surface CD24 drives β1-integrin-dependent contractile forces via Src/STAT3/MLCK/ROCK for cancer cell invasion.\",\n      \"evidence\": \"Co-IP and RNase activity assay for G3BP interaction; Fourier transform traction microscopy with pharmacological inhibitors for contractile forces\",\n      \"pmids\": [\"21266361\", \"21828044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full spectrum of G3BP target mRNAs regulated by CD24 unknown\", \"Whether intracellular and surface CD24 functions are coordinately regulated not addressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"HIF-1α was shown to directly transactivate CD24 via a promoter HRE, and CD24 was identified as the critical effector rescuing HIF-1α-dependent tumor growth and metastasis, placing CD24 in the hypoxia response pathway. Simultaneously, CD24 was found to physically interact with and activate Lyn kinase, linking it to nuclear ERK1/2 signaling.\",\n      \"evidence\": \"ChIP for HIF-1α on CD24 promoter with epistasis rescue in vivo; Co-IP for CD24–Lyn interaction with Lyn inhibitor PP2\",\n      \"pmids\": [\"22926560\", \"22731636\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HIF-1α–CD24 axis operates in non-tumor hypoxic tissues untested\", \"Lyn interaction identified by single Co-IP without reciprocal validation\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The Siglec-G–CD24 axis was established as a negative regulator of graft-versus-host disease, while intracellular CD24 was shown to inactivate p53 by competitively displacing ARF from NPM, revealing dual immune-checkpoint and tumor-suppressor-antagonist functions.\",\n      \"evidence\": \"Siglec-G/CD24 double-KO GVHD models with CD24Fc rescue; Co-IP and competition assay for ARF–NPM displacement with in vivo prostate cancer models\",\n      \"pmids\": [\"24695850\", \"25600590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CD24–NPM interaction unknown\", \"Whether ARF displacement operates in normal (non-transformed) cells not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"ELF5 was identified as a direct transcriptional activator of CD24 via an ETS element, and CD24 was shown to be required for early adipocyte differentiation, expanding its developmental roles beyond hematopoiesis.\",\n      \"evidence\": \"ChIP-seq for ELF5 binding to CD24 promoter with epistasis knockdown; siRNA knockdown during 3T3-L1 adipogenesis with promoter activity assays\",\n      \"pmids\": [\"34146197\", \"26167413\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream adipogenic signals activated by CD24 not identified\", \"ELF5–CD24 axis not validated outside breast cancer cells\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"CD24 was found to stabilize EGFR at the cell surface through RhoA-dependent inhibition of receptor internalization, and GON4L–YY1–androgen receptor was identified as another transcriptional activator complex driving CD24 expression.\",\n      \"evidence\": \"Co-IP for CD24–EGFR and RhoA pulldown in gastric cancer cells; Co-IP for GON4L–YY1–AR with shRNA screen and in vivo xenograft\",\n      \"pmids\": [\"26830684\", \"27312530\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RhoA-dependent EGFR stabilization is specific to gastric cancer untested\", \"GON4L–YY1 regulation of CD24 not confirmed by ChIP\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"SOX2 was shown to directly transactivate CD24 downstream of STAT3 in BRAF-inhibitor-resistant melanoma, and CD24 in turn activated Src/STAT3, establishing a positive feedback loop driving drug resistance.\",\n      \"evidence\": \"ChIP for SOX2 on CD24 promoter with shRNA knockdown and drug resistance assays\",\n      \"pmids\": [\"29905375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this feedback loop operates in BRAF-wild-type tumors unknown\", \"Mechanism by which surface CD24 activates Src not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"CD24 was established as a dominant anti-phagocytic 'don't eat me' signal on tumor cells through Siglec-10 engagement, with genetic ablation or antibody blockade markedly enhancing macrophage phagocytosis and reducing tumor growth in vivo.\",\n      \"evidence\": \"CD24-KO and Siglec-10-KO tumor cells, monoclonal antibody blockade, in vivo tumor growth models across multiple cancer types\",\n      \"pmids\": [\"31367043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of CD24 versus CD47 as anti-phagocytic signals varies by tumor type and is incompletely defined\", \"Therapeutic window for CD24 blockade in humans unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"NPM was shown to transcriptionally induce CD24 through an Sp1 site, with CD24 surface expression being the functional mediator of NPM-driven phagocytosis evasion, and CD24 translocation from cytosol to membrane was linked to phenotype switching and drug persistence in breast cancer.\",\n      \"evidence\": \"NPM silencing with CD24 rescue in phagocytosis assays; flow cytometry and imaging of CD24 localization with p38 MAPK phosphorylation readouts\",\n      \"pmids\": [\"33954835\", \"34426608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism controlling CD24 intracellular-to-membrane translocation not identified\", \"Whether NPM–Sp1–CD24 axis extends beyond endometrial cancer untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The CD24–Siglec-E axis was extended beyond tumor immunity to metabolic inflammation, demonstrating sialylation-dependent SHP-1 recruitment that suppresses obesity-related metaflammation and protects against metabolic syndrome.\",\n      \"evidence\": \"Cd24-KO, Siglec-E-KO, and double-KO mice with CD24Fc treatment, SHP-1 recruitment assays, human clinical correlation\",\n      \"pmids\": [\"35921817\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell type(s) presenting CD24 to tissue macrophages in adipose tissue not definitively identified\", \"Whether CD24Fc therapeutic benefit is mediated solely through Siglec engagement or additional receptors unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of the CD24–Siglec and CD24–NPM interactions; the mechanism by which a GPI-anchored protein activates intracellular Src-family kinases; how CD24 partitions between intracellular (stress granule/NPM-associated) and surface (anti-phagocytic/signaling) pools; and whether the diverse CD24 functions in immunity, metabolism, and neural synaptic maturation share common downstream signaling intermediates.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of CD24 or CD24–Siglec complex\", \"Mechanism coupling GPI anchor to cytoplasmic kinase activation unresolved\", \"Relative physiological importance of intracellular versus surface CD24 pools undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3, 6, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 13, 14]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 6, 13, 19]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 3, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 13, 14, 16, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 7, 8, 9, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3, 4, 10, 23]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SIGLEC10\",\n      \"SIGLEC-G\",\n      \"NPM1\",\n      \"G3BP1\",\n      \"LYN\",\n      \"EGFR\",\n      \"CXCR4\",\n      \"YY1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}