{"gene":"CEACAM5","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2013,"finding":"CEACAM5 binds CD8α through its N-domain (glycosylated residues required) and interacts with CD1d through its B3 domain; CEACAM5-activated CD8+ T cells acquire the ability to suppress CD4+ T cell proliferation in vitro in the presence of IL-15 or IL-7, and removal of N-domain glycosylated residues reduces CD8α binding affinity and Lck activation.","method":"Co-IP, domain deletion mutants, antibody blocking, Lck activation assay, in vitro T cell suppression assay","journal":"Mucosal immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays with domain mutants, functional Lck activation readout, single lab with multiple orthogonal methods","pmids":["24104458"],"is_preprint":false},{"year":2007,"finding":"CEACAM5 (and CEACAM6) expression is transcriptionally driven by Smad3-mediated TGF-β signaling; restoration of TGF-β signaling in TGF-β-unresponsive gastric cancer cell lines (via re-expression of TβRII or Smad3) induced CEACAM5/CEACAM6 expression and activated their promoters. CEA expression was markedly decreased in Smad3 null mice.","method":"Promoter-luciferase assay, rescue expression of TβRII/Smad3 in mutant cell lines, Smad3 knockout mouse model, RT-PCR/Western blot","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (promoter assay, genetic rescue, in vivo knockout), replicated across cell lines and animal model in single study","pmids":["17653079"],"is_preprint":false},{"year":2000,"finding":"CEACAM5 (CD66e) is recruited and clustered around adhering Afa/Dr DAEC bacteria on polarized intestinal Caco-2/TC7 cells, and functions as a receptor for these bacteria; HeLa cells stably expressing CD66e supported efficient Afa/Dr DAEC binding with CD66e clustering; antibody blocking with anti-CD66e antibodies inhibited bacterial adhesion.","method":"Stable transfection of HeLa cells with CD66e, antibody inhibition assays, immunofluorescence of receptor clustering, structural draE gene mutants","journal":"Infection and immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain-of-function (transfection) and antibody blocking with structural mutants in single rigorous study","pmids":["10816511"],"is_preprint":false},{"year":2018,"finding":"CEACAM5 expression is sufficient to rescue T4SS-dependent CagA injection and phosphorylation by Helicobacter pylori in T4SS-deficient AZ-521 cells; CEACAM1 or CEACAM5 (but not CEACAM6) expression restored CagA translocation, and expression was also accompanied by tyrosine dephosphorylation of vinculin and cortactin, indicating CEACAM5 functions as an essential host receptor for H. pylori T4SS delivery.","method":"Genetic introduction of CEACAM1/CEACAM5/CEACAM6 constructs into AZ-521 cells, CagA phosphorylation Western blot, tyrosine dephosphorylation of vinculin/cortactin","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue with multiple CEACAM constructs, multiple functional readouts (CagA phosphorylation, cytoskeletal signaling), clear specificity shown","pmids":["30321907"],"is_preprint":false},{"year":2005,"finding":"CEACAM5 is required for tumorigenic growth of CX-1 colon carcinoma cells in vivo; antisense-mediated reduction of membrane-bound CEACAM5 significantly diminished subcutaneous tumor growth in nude mice, while cells producing large amounts of secreted (but not membrane-bound) CEACAM5 were not rescued, indicating the membrane-anchored form specifically supports primary tumor growth.","method":"Antisense RNA knockdown, xenograft tumor formation assay in nude mice, CEACAM5 expression analysis by ELISA and flow cytometry","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with phenotypic readout, single lab, multiple subclones tested","pmids":["12813580"],"is_preprint":false},{"year":2011,"finding":"Tumor-associated CEACAM5 (from colon cancer patients) carries high levels of Lewis X and Lewis Y blood-group carbohydrates and elevated branched N-glycans and mannose, and these glycan changes enable recognition by the human C-type lectin DC-SIGN on antigen-presenting cells; Galectin-3 binding also correlated with branched N-glycans on tumor CEACAM5.","method":"CEA/MUC1 capture ELISA with plant lectins and human C-type lectins (MGL, DC-SIGN), Galectin-3 binding assay, comparison of matched normal vs. tumor tissue from 48 CRC patients","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct lectin-binding assay on captured antigen from patient tissue, multiple lectins tested, single lab","pmids":["21823122"],"is_preprint":false},{"year":2018,"finding":"CEACAM5 facilitates breast cancer metastatic outgrowth by promoting mesenchymal-to-epithelial transition (MET); overexpression of CEACAM5 enriched for an epithelial gene expression pattern and facilitated tumor outgrowth at metastatic sites in vivo, with an inverse correlation between CEACAM5 and vimentin expression demonstrated in patient samples.","method":"Serial in vivo passaging of lung metastases, high-throughput gain-of-function screen in vivo, transcriptomic profiling, patient tissue immunohistochemistry","journal":"NPJ breast cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function screen validated in vivo, gene expression signature, patient tissue correlation; single lab","pmids":["29736411"],"is_preprint":false},{"year":2018,"finding":"FBW7 suppresses colorectal cancer cell migration by regulating CEACAM5 expression through a HIF1α-dependent mechanism; luciferase and ChIP assays demonstrated CEACAM5 is a direct HIF1α target gene, and FBW7 regulates CEACAM5 in a HIF1α-dependent manner.","method":"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), ectopic FBW7 expression, CEACAM5 silencing, migration assay, GEO microarray analysis, IHC of TMA","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and luciferase assays establish CEACAM5 as HIF1α target, functional rescue with CEACAM5 silencing; single lab","pmids":["29910683"],"is_preprint":false},{"year":2020,"finding":"ASCL1 (a pioneer transcription factor) drives neuroendocrine reprogramming of prostate cancer associated with increased chromatin accessibility at the CEACAM5 core promoter, leading to increased CEACAM5 expression; this was established using a genetically defined neuroendocrine transdifferentiation assay.","method":"Neuroendocrine transdifferentiation assay, chromatin accessibility analysis (ATAC-seq or equivalent), ASCL1 correlation with CEACAM5 expression","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetically defined transdifferentiation model with chromatin accessibility readout, single lab","pmids":["33199493"],"is_preprint":false},{"year":2020,"finding":"CEACAM5 depletion in NSCLC cells inhibited proliferation and migration by activating p38-Smad2/3 signaling, suggesting CEACAM5 suppresses this pathway to promote tumor progression.","method":"siRNA knockdown, MTT assay, colony formation, wound healing, immunoblot for p38-Smad2/3, in vivo xenograft","journal":"The Journal of international medical research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single knockdown approach, pathway assignment by immunoblot only without pathway rescue","pmids":["32993395"],"is_preprint":false},{"year":2020,"finding":"CEACAM5 on tumor cells engages CEACAM1 on NK cells as an inhibitory immune checkpoint, suppressing NK cell cytotoxicity; blocking CEACAM5 with the antibody NEO-201 restored NK-92 cell killing of CEACAM5-positive tumor cell lines in vitro, demonstrating the CEACAM5/CEACAM1 heterophilic interaction as the mechanism.","method":"In vitro NK cytotoxicity assay with NK-92 cells, antibody blocking with NEO-201, expression profiling of CEACAM5/NEO-201 on tumor cell lines","journal":"Cancer biotherapy & radiopharmaceuticals","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional cytotoxicity assay with antibody blockade, uses NK-92 cells (lacks ADCC), single lab","pmids":["31928422"],"is_preprint":false},{"year":2011,"finding":"Anti-CEACAM5 monoclonal antibody CC4 enhances NK cell cytotoxicity against MHC-I-deficient colorectal cancer cells by blocking the intercellular interaction between epithelial CEACAM5 and the NK inhibitory receptor CEACAM1, thereby relieving CEACAM1-dependent inhibition of NK killing.","method":"In vitro NK cytotoxicity assay (ADCC and direct killing), antibody blocking, cell proliferation/migration/aggregation assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional NK killing assay with specific antibody blockade, mechanistic readout showing restored cytotoxicity; single lab","pmids":["21731662"],"is_preprint":false},{"year":2024,"finding":"CryoEM structure of CEACAM5 A3-B3 domains in complex with the Fab fragment of tusamitamab (anti-CEACAM5 antibody) at 3.11 Å resolution revealed a discontinuous epitope involving residues in both A3 and B3 domains and an N-linked mannose at Asn612; H/D exchange MS identified the paratope (HC residues 101-109, LC residues 48-54 and 88-104); alanine mutagenesis of HC residues 96-108 abolished binding by SPR.","method":"Cryo-EM structure determination (3.11 Å), hydrogen/deuterium exchange mass spectrometry, surface plasmon resonance with alanine variants","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with HDX-MS paratope mapping and SPR mutagenesis in a single rigorous study","pmids":["39477960"],"is_preprint":false},{"year":2024,"finding":"Hypoxia-induced CEACAM5 is enriched in exosomes from pancreatic neuroendocrine tumor cells; exosomal CEACAM5 induces M2 polarization of tumor-associated macrophages through activation of the MAPK signaling pathway, and M2-polarized macrophages in turn facilitate pNETs cell migration and invasion.","method":"Exosome isolation and characterization, co-culture assays, MAPK pathway activation analysis, macrophage polarization assay, migration/invasion assays","journal":"FASEB journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mechanistic pathway assignment (MAPK) by co-culture assay, single lab, limited functional rescue experiments described in abstract","pmids":["38923643"],"is_preprint":false},{"year":2024,"finding":"SARS-CoV-2 spike protein induces intestinal barrier dysfunction through interaction between CEACAM5 and Galectin-9; co-IP validated the CEACAM5-Galectin-9 interaction; reduction of CEACAM5 in spike-stimulated enterocytes promoted Galectin-9 expression in CD4+ T cells, leading to inflammatory cytokine release and apoptosis via inhibition of PI3K/AKT/mTOR pathway.","method":"Co-immunoprecipitation, molecular docking, mouse spike-Fc injection model, proteomic analysis, KEGG/PPI network analysis, co-culture of CD4+ T cells with Caco-2 cells","journal":"Frontiers in immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP plus molecular docking, pathway mechanistic follow-up is indirect; single lab","pmids":["38686388"],"is_preprint":false},{"year":2022,"finding":"CEACAM5 inhibits lymphatic metastasis of head and neck squamous cell carcinoma by inhibiting EMT through reduction of MDM2 expression; CEACAM5 knockdown/overexpression in HNSCC cell lines modulated MDM2 levels, EMT markers, proliferation, and invasion, and a mouse LN metastasis xenograft model confirmed the anti-metastatic role.","method":"siRNA knockdown and overexpression in HNSCC cell lines, MDM2 expression analysis, EMT marker Western blot, in vivo mouse LN metastasis model","journal":"Clinical science","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, pathway assignment by protein expression correlation without direct mechanistic rescue of MDM2","pmids":["36377775"],"is_preprint":false},{"year":2025,"finding":"CEACAM5 promotes ferroptosis and autophagy in airway epithelial cells through the JAK/STAT6 pathway, exacerbating asthma; CEACAM5 overexpression in IL-13-stimulated cells activated JAK/STAT6 signaling, which was necessary for CEACAM5-induced ROS accumulation, lipid peroxidation, and ferroptosis; CEACAM5 interference reduced these effects.","method":"OVA-sensitized mouse model, IL-13-stimulated Beas-2B cell model, CEACAM5 overexpression and siRNA knockdown, ROS/lipid peroxidation assays, JAK/STAT6 pathway inhibitor","journal":"Redox report","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, pathway inhibitor used without direct rescue by JAK/STAT6 pathway restoration; mechanistic link is correlative","pmids":["39844719"],"is_preprint":false},{"year":2005,"finding":"Antibody Fabs targeting the N-terminal and A1B1 domains of CEACAM5/CEACAM6 (MN-3, MN-15) inhibit tumor cell migration, invasion through extracellular matrix, and adhesion to endothelial cells in vitro, and have antimetastatic effects in vivo in the GW-39 human colonic micrometastasis model; the A3B3-domain-specific MN-14 Fab also reduced adhesion to endothelial cells but not ECM proteins.","method":"Migration assay, invasion assay (ECM penetration), adhesion assay (endothelial cells, fibronectin, other ECM proteins), in vivo mouse micrometastasis model with survival endpoint","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vitro functional assays and in vivo survival model, domain-specific Fab probes define which epitopes mediate function; single lab","pmids":["16204051"],"is_preprint":false},{"year":2025,"finding":"F. nucleatum surface adhesin CbpF binds CEACAM5 (and CEACAM1) through the EFNGQYQ loop on CbpF and the key Q78 residue of CEACAM5/CEACAM1; structural analysis revealed a Velcro-like multivalent adhesion model enabling CbpF to engage multiple CEACAM1/CEACAM5 molecules simultaneously for dynamic switching between firm anchoring and detachment.","method":"Structural determination of CbpF–CEACAM1/CEACAM5 complex, mutagenesis identifying EFNGQYQ loop and Q78 as key contact residues, mechanistic binding studies","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural resolution of pathogen-host interface combined with mutagenesis identifying specific binding residues in a single rigorous study","pmids":["40928870"],"is_preprint":false},{"year":2035,"finding":"CEACAM5 antigen becomes sequestered in intercellular junctions as colorectal cancer (CRC) cell monolayers mature, reducing accessible surface CEACAM5 and causing non-sustained CAR T cell activation (oscillating rather than sustained calcium fluxes); proteolytic disruption of CRC monolayers with trypsin or hyaluronidase treatment increased CEACAM5 accessibility, restored sustained calcium fluxes, and significantly enhanced CAR T cell cytotoxicity and TNF-α secretion.","method":"Fluorescence microscopy of CEACAM5 localization and glycocalyx thickness, live-cell calcium flux imaging, cytotoxicity assays with anti-CEACAM5 CAR T cells, local micropipette trypsin/hyaluronidase treatment, human tissue sections","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with functional calcium flux readout, enzymatic rescue experiments with cytotoxicity and cytokine readout; single lab","pmids":["41572139"],"is_preprint":false},{"year":2035,"finding":"CT109 antibody (dual CEACAM5/CEACAM6 specificity) binds a glycoepitope centered on N309 of CEACAM5/CEACAM6 as determined by scanning mutagenesis; CT109 is internalized by CEACAM5+/CEACAM6+ PDAC cells with a half-life of 2.3 hours.","method":"Scanning mutagenesis of the CT109 epitope, immunoblot and flow cytometry for specificity, internalization kinetics assay","journal":"Current cancer drug targets","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — scanning mutagenesis identifies specific glycoepitope, internalization kinetics quantified; single lab","pmids":["38178674"],"is_preprint":false},{"year":2035,"finding":"CEACAM5 promoter hypomethylation is a major regulatory mechanism controlling CEA expression in colorectal cancer; treatment with the demethylating agent 5-aza-2'-deoxycytidine enhanced CEACAM5/CEA expression in HCT116 and HT29 cells, and CRC patient samples with elevated serum CEA showed lower average CpG methylation at the CEACAM5 promoter. Critical methylation CpG regions were mapped to -200 to -500 bp and -1000 to -1400 bp upstream of the transcription start site.","method":"5-Aza-dC demethylation treatment, CpG methylation analysis of CEACAM5 promoter, serum CEA measurement in CRC patients, bisulfite sequencing","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological demethylation with functional CEA expression readout plus mapping of critical CpG regions; validated in both cell lines and patient samples","pmids":["37942534"],"is_preprint":false}],"current_model":"CEACAM5 is a GPI-anchored glycoprotein whose expression is transcriptionally regulated by Smad3-mediated TGF-β signaling, HIF1α (downstream of FBW7), ASCL1-driven chromatin remodeling, deltaN-TCF-1B, and promoter DNA methylation status; its membrane-anchored form supports tumor cell adhesion, migration, and primary tumor growth through homotypic and heterotypic interactions, and it functions as a host receptor for bacterial pathogens (Afa/Dr DAEC via GPI clustering, H. pylori CagA T4SS via integrin-β1/CEACAM pathway, and F. nucleatum CbpF via a Velcro-like multivalent interaction involving Q78); on immune cells, CEACAM5 on tumor cells engages the inhibitory receptor CEACAM1 on NK cells to suppress cytotoxicity, and on intestinal epithelial cells CEACAM5 binds CD8α (N-domain, glycan-dependent) and CD1d (B3 domain) to activate CD8+ suppressor T cells; structurally, the A3-B3 domains form a discontinuous epitope (including N-linked mannose at Asn612) recognized by therapeutic antibodies, and tumor-associated CEACAM5 carries distinct glycan modifications (Lewis X/Y, branched N-glycans) that enable DC-SIGN recognition."},"narrative":{"mechanistic_narrative":"CEACAM5 is a GPI-anchored, heavily glycosylated cell-surface glycoprotein that functions as an adhesion molecule and signaling ligand on epithelial and tumor cells, with major roles in tumor progression, immune modulation, and as a receptor for bacterial pathogens [PMID:12813580, PMID:31928422, PMID:10816511]. Its expression is controlled at multiple levels: by Smad3-mediated TGF-β signaling, which induces CEACAM5 and is required for normal CEA expression in vivo [PMID:17653079]; by HIF1α acting as a direct transcriptional activator downstream of FBW7 [PMID:29910683]; by ASCL1-driven increases in chromatin accessibility at the core promoter during neuroendocrine reprogramming [PMID:33199493]; and by promoter CpG hypomethylation, which derepresses CEA expression in colorectal cancer [PMID:37942534]. The membrane-anchored (not secreted) form specifically supports primary tumor growth, and domain-specific antibody Fabs targeting the N-terminal/A1B1 and A3B3 domains block tumor cell migration, ECM invasion, and endothelial adhesion [PMID:12813580, PMID:16204051]. On tumor cells, CEACAM5 engages the inhibitory receptor CEACAM1 on NK cells as an immune checkpoint, and antibody blockade of this heterophilic interaction restores NK cytotoxicity [PMID:31928422, PMID:21731662]. On intestinal epithelium, CEACAM5 binds CD8α through its glycosylated N-domain and CD1d through its B3 domain to activate CD8+ suppressor T cells [PMID:24104458]. CEACAM5 serves as a host receptor for multiple bacteria, mediating Afa/Dr DAEC adhesion via receptor clustering [PMID:10816511], H. pylori CagA T4SS delivery [PMID:30321907], and F. nucleatum CbpF binding through the conserved Q78 residue in a multivalent Velcro-like mode [PMID:40928870]. Tumor-associated CEACAM5 carries distinctive glycans—Lewis X/Y, branched N-glycans, and mannose—that confer recognition by the C-type lectin DC-SIGN [PMID:21823122], and its A3-B3 domains form a discontinuous, glycan-containing epitope (N-linked mannose at Asn612) targeted by therapeutic antibodies [PMID:39477960].","teleology":[{"year":2000,"claim":"Established that CEACAM5 acts as a functional surface receptor for enteric bacteria, not merely a passive adhesion antigen, by showing it is clustered around and required for Afa/Dr DAEC adhesion.","evidence":"Stable CD66e transfection of HeLa cells, antibody blocking, and immunofluorescence of receptor clustering in polarized Caco-2/TC7 cells","pmids":["10816511"],"confidence":"High","gaps":["Did not define the CEACAM5 domain or glycan determinants of bacterial binding","Signaling consequences of clustering not characterized"]},{"year":2005,"claim":"Distinguished the membrane-anchored form of CEACAM5 as the species driving primary tumor growth, addressing whether secreted versus surface CEA mediates the oncogenic phenotype.","evidence":"Antisense knockdown and xenograft tumor formation in nude mice with subclones producing membrane-bound versus secreted CEACAM5","pmids":["12813580"],"confidence":"Medium","gaps":["Molecular mechanism by which membrane CEACAM5 promotes growth not defined","Single cell line/lab"]},{"year":2005,"claim":"Mapped which CEACAM5 domains mediate distinct adhesive/invasive functions, showing N-terminal/A1B1 epitopes govern migration and ECM invasion while A3B3 governs endothelial adhesion.","evidence":"Domain-specific antibody Fabs (MN-3, MN-15, MN-14) in migration, invasion, adhesion assays and an in vivo micrometastasis model","pmids":["16204051"],"confidence":"Medium","gaps":["Did not identify the counter-receptors engaged by each domain","Antibody Fabs may have steric effects beyond their target epitope"]},{"year":2007,"claim":"Identified TGF-β/Smad3 as a direct transcriptional driver of CEACAM5, providing the first upstream regulatory pathway.","evidence":"Promoter-luciferase assays, TβRII/Smad3 rescue in unresponsive gastric cancer lines, and Smad3-null mice","pmids":["17653079"],"confidence":"High","gaps":["Direct Smad3 binding site on the promoter not delineated","Relationship to other regulators not addressed"]},{"year":2011,"claim":"Demonstrated the CEACAM5/CEACAM1 heterophilic interaction is an NK-cell inhibitory checkpoint that can be relieved by antibody blockade, framing CEACAM5 as an immune evasion ligand.","evidence":"In vitro NK cytotoxicity assays against MHC-I-deficient CRC cells with anti-CEACAM5 antibody CC4 blocking","pmids":["21731662"],"confidence":"Medium","gaps":["In vitro only; no in vivo confirmation","Binding interface between CEACAM5 and CEACAM1 not structurally defined"]},{"year":2011,"claim":"Showed that tumor-specific glycan remodeling of CEACAM5 creates lectin-recognition determinants, linking aberrant glycosylation to immune recognition.","evidence":"Lectin capture ELISA (DC-SIGN, MGL, Galectin-3) on CEACAM5 from matched normal versus tumor CRC tissue from 48 patients","pmids":["21823122"],"confidence":"Medium","gaps":["Functional consequence of DC-SIGN recognition on APC behavior not tested","Glycan structures inferred from lectin binding rather than directly resolved"]},{"year":2013,"claim":"Defined the domain and glycan requirements for CEACAM5 engagement of CD8α and CD1d, establishing it as an activating ligand for suppressor CD8+ T cells in the intestine.","evidence":"Co-IP, domain deletion mutants, Lck activation assay, and in vitro T cell suppression assays with IL-15/IL-7","pmids":["24104458"],"confidence":"Medium","gaps":["In vivo relevance of CD8+ suppressor induction not established","Single lab"]},{"year":2018,"claim":"Placed CEACAM5 within the FBW7–HIF1α axis as a direct hypoxia-responsive target gene controlling colorectal cancer cell migration.","evidence":"Luciferase reporter and ChIP assays, ectopic FBW7 expression with CEACAM5 silencing and migration assays","pmids":["29910683"],"confidence":"Medium","gaps":["HIF1α binding site coordinates not finely mapped","Connection to other CEACAM5 regulators unresolved"]},{"year":2018,"claim":"Showed CEACAM5 can promote metastatic outgrowth by driving mesenchymal-to-epithelial transition, contrasting with anti-metastatic roles reported in other cancers.","evidence":"Serial in vivo metastasis passaging, in vivo gain-of-function screen, transcriptomics, and patient IHC (inverse CEACAM5/vimentin correlation)","pmids":["29736411"],"confidence":"Medium","gaps":["Molecular mechanism linking CEACAM5 to the epithelial program not defined","Apparent context-dependent opposite effects on EMT across tumor types unreconciled"]},{"year":2018,"claim":"Established CEACAM5 as an essential host receptor for H. pylori T4SS effector delivery, extending its receptor function to a second pathogen system.","evidence":"Genetic introduction of CEACAM1/5/6 into T4SS-deficient AZ-521 cells with CagA phosphorylation and vinculin/cortactin dephosphorylation readouts","pmids":["30321907"],"confidence":"High","gaps":["Direct bacterial adhesin–CEACAM5 contact residues not mapped in this study","Mechanism of T4SS coupling to CEACAM5 unresolved"]},{"year":2020,"claim":"Identified ASCL1-driven chromatin remodeling at the CEACAM5 promoter as the mechanism elevating CEACAM5 during neuroendocrine transdifferentiation, expanding regulation to a lineage-plasticity context.","evidence":"Genetically defined neuroendocrine transdifferentiation assay with chromatin accessibility profiling","pmids":["33199493"],"confidence":"Medium","gaps":["Direct ASCL1 occupancy at the promoter not shown","Functional role of elevated CEACAM5 in neuroendocrine cells untested"]},{"year":2020,"claim":"Reinforced the CEACAM5/CEACAM1 NK checkpoint mechanism using a distinct blocking antibody, supporting therapeutic targeting of the interaction.","evidence":"In vitro NK-92 cytotoxicity assays with NEO-201 antibody blockade against CEACAM5+ tumor lines","pmids":["31928422"],"confidence":"Medium","gaps":["NK-92 lacks ADCC, so only direct inhibition tested","In vivo efficacy not addressed"]},{"year":2023,"claim":"Identified promoter hypomethylation as a major epigenetic switch controlling CEA expression and serum CEA levels in colorectal cancer.","evidence":"5-aza-2'-deoxycytidine demethylation in HCT116/HT29 cells, bisulfite CpG mapping, and serum CEA correlation in CRC patients","pmids":["37942534"],"confidence":"Medium","gaps":["Causal demethylation at specific mapped CpGs not directly tested","Interplay with TGF-β/HIF1α regulation not integrated"]},{"year":2024,"claim":"Resolved the structural basis of therapeutic antibody recognition, defining a discontinuous A3-B3 glycoepitope including N-linked mannose at Asn612.","evidence":"3.11 Å cryo-EM of CEACAM5 A3-B3/tusamitamab Fab, HDX-MS paratope mapping, and SPR alanine mutagenesis","pmids":["39477960"],"confidence":"High","gaps":["Structure limited to A3-B3 fragment, not full-length CEACAM5","Does not address heterophilic counter-receptor interfaces"]},{"year":2025,"claim":"Provided atomic detail of a third pathogen interaction, defining the F. nucleatum CbpF–CEACAM5 interface and a multivalent Velcro-like adhesion mechanism.","evidence":"Structural determination of CbpF–CEACAM1/CEACAM5 complex with mutagenesis of the EFNGQYQ loop and CEACAM5 Q78","pmids":["40928870"],"confidence":"High","gaps":["Cellular consequences of multivalent engagement not functionally assayed here","Affinity contributions of individual contacts not quantified"]},{"year":2035,"claim":"Showed that surface accessibility of CEACAM5, governed by junctional sequestration and glycocalyx, is a rate-limiting determinant of anti-CEACAM5 CAR T cell activation.","evidence":"Live-cell calcium imaging, CEACAM5 localization microscopy, and trypsin/hyaluronidase rescue with cytotoxicity and TNF-α readouts in CRC monolayers","pmids":["41572139"],"confidence":"Medium","gaps":["Mechanism of junctional CEACAM5 sequestration not molecularly defined","Single-lab model system"]},{"year":null,"claim":"It remains unresolved how the diverse, context-dependent CEACAM5 phenotypes (pro- versus anti-metastatic, immune-suppressive versus inflammatory) are integrated through a unified downstream signaling logic.","evidence":"No single study in the corpus reconciles the opposing functional outcomes across tissue and tumor contexts","pmids":[],"confidence":"Low","gaps":["No defined cytoplasmic signaling output for a GPI-anchored protein","Counter-receptor stoichiometry and downstream effectors largely uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[2,3,18]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[4,17]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,10,11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,4,10]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,10,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,3,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,7,8,21]}],"complexes":[],"partners":["CEACAM1","CD8A","CD1D","LGALS9","LGALS3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P06731","full_name":"Cell adhesion molecule CEACAM5","aliases":["Carcinoembryonic antigen","CEA","Carcinoembryonic antigen-related cell adhesion molecule 5","CEA cell adhesion molecule 5","Meconium antigen 100"],"length_aa":702,"mass_kda":76.8,"function":"Cell surface glycoprotein that plays a role in cell adhesion, intracellular signaling and tumor progression (PubMed:10864933, PubMed:10910050, PubMed:2803308). Mediates homophilic and heterophilic cell adhesion with other carcinoembryonic antigen-related cell adhesion molecules, such as CEACAM6 (PubMed:2803308). Plays a role as an oncogene by promoting tumor progression; induces resistance to anoikis of colorectal carcinoma cells (PubMed:10910050) (Microbial infection) Receptor for E.coli Dr adhesins. 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NSCLC.","date":"2025","source":"JTO clinical and research reports","url":"https://pubmed.ncbi.nlm.nih.gov/41584721","citation_count":0,"is_preprint":false},{"pmid":"41572139","id":"PMC_41572139","title":"Enzymatic Remodelling of Tumour Microenvironment Enhances Anti-CEACAM5 CAR T-Cell Efficacy Against Colorectal Cancer.","date":"2026","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/41572139","citation_count":0,"is_preprint":false},{"pmid":"41238651","id":"PMC_41238651","title":"MiR-5095 inhibits proliferation, migration, and invasion of gastric cancer cells by targeting CEACAM5.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/41238651","citation_count":0,"is_preprint":false},{"pmid":"31865362","id":"PMC_31865362","title":"Platelet Carcinoembryonic Antigen Cell Adhesion Molecule 5 (CEACAM5) as a Possible Novel Diagnostic Tool for Evaluation of Acute Coronary Syndrome.","date":"2019","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/31865362","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.10.687473","title":"Decoding the Circulating Proteome: Matrix and Immune Context Markers Shape Early Multi-Cancer Detection","date":"2025-11-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.10.687473","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46858,"output_tokens":6060,"usd":0.115737,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14839,"output_tokens":5146,"usd":0.101422,"stage2_stop_reason":"end_turn"},"total_usd":0.217159,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"CEACAM5 binds CD8α through its N-domain (glycosylated residues required) and interacts with CD1d through its B3 domain; CEACAM5-activated CD8+ T cells acquire the ability to suppress CD4+ T cell proliferation in vitro in the presence of IL-15 or IL-7, and removal of N-domain glycosylated residues reduces CD8α binding affinity and Lck activation.\",\n      \"method\": \"Co-IP, domain deletion mutants, antibody blocking, Lck activation assay, in vitro T cell suppression assay\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays with domain mutants, functional Lck activation readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24104458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CEACAM5 (and CEACAM6) expression is transcriptionally driven by Smad3-mediated TGF-β signaling; restoration of TGF-β signaling in TGF-β-unresponsive gastric cancer cell lines (via re-expression of TβRII or Smad3) induced CEACAM5/CEACAM6 expression and activated their promoters. CEA expression was markedly decreased in Smad3 null mice.\",\n      \"method\": \"Promoter-luciferase assay, rescue expression of TβRII/Smad3 in mutant cell lines, Smad3 knockout mouse model, RT-PCR/Western blot\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (promoter assay, genetic rescue, in vivo knockout), replicated across cell lines and animal model in single study\",\n      \"pmids\": [\"17653079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CEACAM5 (CD66e) is recruited and clustered around adhering Afa/Dr DAEC bacteria on polarized intestinal Caco-2/TC7 cells, and functions as a receptor for these bacteria; HeLa cells stably expressing CD66e supported efficient Afa/Dr DAEC binding with CD66e clustering; antibody blocking with anti-CD66e antibodies inhibited bacterial adhesion.\",\n      \"method\": \"Stable transfection of HeLa cells with CD66e, antibody inhibition assays, immunofluorescence of receptor clustering, structural draE gene mutants\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain-of-function (transfection) and antibody blocking with structural mutants in single rigorous study\",\n      \"pmids\": [\"10816511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CEACAM5 expression is sufficient to rescue T4SS-dependent CagA injection and phosphorylation by Helicobacter pylori in T4SS-deficient AZ-521 cells; CEACAM1 or CEACAM5 (but not CEACAM6) expression restored CagA translocation, and expression was also accompanied by tyrosine dephosphorylation of vinculin and cortactin, indicating CEACAM5 functions as an essential host receptor for H. pylori T4SS delivery.\",\n      \"method\": \"Genetic introduction of CEACAM1/CEACAM5/CEACAM6 constructs into AZ-521 cells, CagA phosphorylation Western blot, tyrosine dephosphorylation of vinculin/cortactin\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue with multiple CEACAM constructs, multiple functional readouts (CagA phosphorylation, cytoskeletal signaling), clear specificity shown\",\n      \"pmids\": [\"30321907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CEACAM5 is required for tumorigenic growth of CX-1 colon carcinoma cells in vivo; antisense-mediated reduction of membrane-bound CEACAM5 significantly diminished subcutaneous tumor growth in nude mice, while cells producing large amounts of secreted (but not membrane-bound) CEACAM5 were not rescued, indicating the membrane-anchored form specifically supports primary tumor growth.\",\n      \"method\": \"Antisense RNA knockdown, xenograft tumor formation assay in nude mice, CEACAM5 expression analysis by ELISA and flow cytometry\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with phenotypic readout, single lab, multiple subclones tested\",\n      \"pmids\": [\"12813580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Tumor-associated CEACAM5 (from colon cancer patients) carries high levels of Lewis X and Lewis Y blood-group carbohydrates and elevated branched N-glycans and mannose, and these glycan changes enable recognition by the human C-type lectin DC-SIGN on antigen-presenting cells; Galectin-3 binding also correlated with branched N-glycans on tumor CEACAM5.\",\n      \"method\": \"CEA/MUC1 capture ELISA with plant lectins and human C-type lectins (MGL, DC-SIGN), Galectin-3 binding assay, comparison of matched normal vs. tumor tissue from 48 CRC patients\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct lectin-binding assay on captured antigen from patient tissue, multiple lectins tested, single lab\",\n      \"pmids\": [\"21823122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CEACAM5 facilitates breast cancer metastatic outgrowth by promoting mesenchymal-to-epithelial transition (MET); overexpression of CEACAM5 enriched for an epithelial gene expression pattern and facilitated tumor outgrowth at metastatic sites in vivo, with an inverse correlation between CEACAM5 and vimentin expression demonstrated in patient samples.\",\n      \"method\": \"Serial in vivo passaging of lung metastases, high-throughput gain-of-function screen in vivo, transcriptomic profiling, patient tissue immunohistochemistry\",\n      \"journal\": \"NPJ breast cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function screen validated in vivo, gene expression signature, patient tissue correlation; single lab\",\n      \"pmids\": [\"29736411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FBW7 suppresses colorectal cancer cell migration by regulating CEACAM5 expression through a HIF1α-dependent mechanism; luciferase and ChIP assays demonstrated CEACAM5 is a direct HIF1α target gene, and FBW7 regulates CEACAM5 in a HIF1α-dependent manner.\",\n      \"method\": \"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), ectopic FBW7 expression, CEACAM5 silencing, migration assay, GEO microarray analysis, IHC of TMA\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and luciferase assays establish CEACAM5 as HIF1α target, functional rescue with CEACAM5 silencing; single lab\",\n      \"pmids\": [\"29910683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ASCL1 (a pioneer transcription factor) drives neuroendocrine reprogramming of prostate cancer associated with increased chromatin accessibility at the CEACAM5 core promoter, leading to increased CEACAM5 expression; this was established using a genetically defined neuroendocrine transdifferentiation assay.\",\n      \"method\": \"Neuroendocrine transdifferentiation assay, chromatin accessibility analysis (ATAC-seq or equivalent), ASCL1 correlation with CEACAM5 expression\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetically defined transdifferentiation model with chromatin accessibility readout, single lab\",\n      \"pmids\": [\"33199493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CEACAM5 depletion in NSCLC cells inhibited proliferation and migration by activating p38-Smad2/3 signaling, suggesting CEACAM5 suppresses this pathway to promote tumor progression.\",\n      \"method\": \"siRNA knockdown, MTT assay, colony formation, wound healing, immunoblot for p38-Smad2/3, in vivo xenograft\",\n      \"journal\": \"The Journal of international medical research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single knockdown approach, pathway assignment by immunoblot only without pathway rescue\",\n      \"pmids\": [\"32993395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CEACAM5 on tumor cells engages CEACAM1 on NK cells as an inhibitory immune checkpoint, suppressing NK cell cytotoxicity; blocking CEACAM5 with the antibody NEO-201 restored NK-92 cell killing of CEACAM5-positive tumor cell lines in vitro, demonstrating the CEACAM5/CEACAM1 heterophilic interaction as the mechanism.\",\n      \"method\": \"In vitro NK cytotoxicity assay with NK-92 cells, antibody blocking with NEO-201, expression profiling of CEACAM5/NEO-201 on tumor cell lines\",\n      \"journal\": \"Cancer biotherapy & radiopharmaceuticals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cytotoxicity assay with antibody blockade, uses NK-92 cells (lacks ADCC), single lab\",\n      \"pmids\": [\"31928422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Anti-CEACAM5 monoclonal antibody CC4 enhances NK cell cytotoxicity against MHC-I-deficient colorectal cancer cells by blocking the intercellular interaction between epithelial CEACAM5 and the NK inhibitory receptor CEACAM1, thereby relieving CEACAM1-dependent inhibition of NK killing.\",\n      \"method\": \"In vitro NK cytotoxicity assay (ADCC and direct killing), antibody blocking, cell proliferation/migration/aggregation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional NK killing assay with specific antibody blockade, mechanistic readout showing restored cytotoxicity; single lab\",\n      \"pmids\": [\"21731662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CryoEM structure of CEACAM5 A3-B3 domains in complex with the Fab fragment of tusamitamab (anti-CEACAM5 antibody) at 3.11 Å resolution revealed a discontinuous epitope involving residues in both A3 and B3 domains and an N-linked mannose at Asn612; H/D exchange MS identified the paratope (HC residues 101-109, LC residues 48-54 and 88-104); alanine mutagenesis of HC residues 96-108 abolished binding by SPR.\",\n      \"method\": \"Cryo-EM structure determination (3.11 Å), hydrogen/deuterium exchange mass spectrometry, surface plasmon resonance with alanine variants\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with HDX-MS paratope mapping and SPR mutagenesis in a single rigorous study\",\n      \"pmids\": [\"39477960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hypoxia-induced CEACAM5 is enriched in exosomes from pancreatic neuroendocrine tumor cells; exosomal CEACAM5 induces M2 polarization of tumor-associated macrophages through activation of the MAPK signaling pathway, and M2-polarized macrophages in turn facilitate pNETs cell migration and invasion.\",\n      \"method\": \"Exosome isolation and characterization, co-culture assays, MAPK pathway activation analysis, macrophage polarization assay, migration/invasion assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mechanistic pathway assignment (MAPK) by co-culture assay, single lab, limited functional rescue experiments described in abstract\",\n      \"pmids\": [\"38923643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SARS-CoV-2 spike protein induces intestinal barrier dysfunction through interaction between CEACAM5 and Galectin-9; co-IP validated the CEACAM5-Galectin-9 interaction; reduction of CEACAM5 in spike-stimulated enterocytes promoted Galectin-9 expression in CD4+ T cells, leading to inflammatory cytokine release and apoptosis via inhibition of PI3K/AKT/mTOR pathway.\",\n      \"method\": \"Co-immunoprecipitation, molecular docking, mouse spike-Fc injection model, proteomic analysis, KEGG/PPI network analysis, co-culture of CD4+ T cells with Caco-2 cells\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP plus molecular docking, pathway mechanistic follow-up is indirect; single lab\",\n      \"pmids\": [\"38686388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CEACAM5 inhibits lymphatic metastasis of head and neck squamous cell carcinoma by inhibiting EMT through reduction of MDM2 expression; CEACAM5 knockdown/overexpression in HNSCC cell lines modulated MDM2 levels, EMT markers, proliferation, and invasion, and a mouse LN metastasis xenograft model confirmed the anti-metastatic role.\",\n      \"method\": \"siRNA knockdown and overexpression in HNSCC cell lines, MDM2 expression analysis, EMT marker Western blot, in vivo mouse LN metastasis model\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, pathway assignment by protein expression correlation without direct mechanistic rescue of MDM2\",\n      \"pmids\": [\"36377775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CEACAM5 promotes ferroptosis and autophagy in airway epithelial cells through the JAK/STAT6 pathway, exacerbating asthma; CEACAM5 overexpression in IL-13-stimulated cells activated JAK/STAT6 signaling, which was necessary for CEACAM5-induced ROS accumulation, lipid peroxidation, and ferroptosis; CEACAM5 interference reduced these effects.\",\n      \"method\": \"OVA-sensitized mouse model, IL-13-stimulated Beas-2B cell model, CEACAM5 overexpression and siRNA knockdown, ROS/lipid peroxidation assays, JAK/STAT6 pathway inhibitor\",\n      \"journal\": \"Redox report\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, pathway inhibitor used without direct rescue by JAK/STAT6 pathway restoration; mechanistic link is correlative\",\n      \"pmids\": [\"39844719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Antibody Fabs targeting the N-terminal and A1B1 domains of CEACAM5/CEACAM6 (MN-3, MN-15) inhibit tumor cell migration, invasion through extracellular matrix, and adhesion to endothelial cells in vitro, and have antimetastatic effects in vivo in the GW-39 human colonic micrometastasis model; the A3B3-domain-specific MN-14 Fab also reduced adhesion to endothelial cells but not ECM proteins.\",\n      \"method\": \"Migration assay, invasion assay (ECM penetration), adhesion assay (endothelial cells, fibronectin, other ECM proteins), in vivo mouse micrometastasis model with survival endpoint\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vitro functional assays and in vivo survival model, domain-specific Fab probes define which epitopes mediate function; single lab\",\n      \"pmids\": [\"16204051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"F. nucleatum surface adhesin CbpF binds CEACAM5 (and CEACAM1) through the EFNGQYQ loop on CbpF and the key Q78 residue of CEACAM5/CEACAM1; structural analysis revealed a Velcro-like multivalent adhesion model enabling CbpF to engage multiple CEACAM1/CEACAM5 molecules simultaneously for dynamic switching between firm anchoring and detachment.\",\n      \"method\": \"Structural determination of CbpF–CEACAM1/CEACAM5 complex, mutagenesis identifying EFNGQYQ loop and Q78 as key contact residues, mechanistic binding studies\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural resolution of pathogen-host interface combined with mutagenesis identifying specific binding residues in a single rigorous study\",\n      \"pmids\": [\"40928870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2035,\n      \"finding\": \"CEACAM5 antigen becomes sequestered in intercellular junctions as colorectal cancer (CRC) cell monolayers mature, reducing accessible surface CEACAM5 and causing non-sustained CAR T cell activation (oscillating rather than sustained calcium fluxes); proteolytic disruption of CRC monolayers with trypsin or hyaluronidase treatment increased CEACAM5 accessibility, restored sustained calcium fluxes, and significantly enhanced CAR T cell cytotoxicity and TNF-α secretion.\",\n      \"method\": \"Fluorescence microscopy of CEACAM5 localization and glycocalyx thickness, live-cell calcium flux imaging, cytotoxicity assays with anti-CEACAM5 CAR T cells, local micropipette trypsin/hyaluronidase treatment, human tissue sections\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with functional calcium flux readout, enzymatic rescue experiments with cytotoxicity and cytokine readout; single lab\",\n      \"pmids\": [\"41572139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2035,\n      \"finding\": \"CT109 antibody (dual CEACAM5/CEACAM6 specificity) binds a glycoepitope centered on N309 of CEACAM5/CEACAM6 as determined by scanning mutagenesis; CT109 is internalized by CEACAM5+/CEACAM6+ PDAC cells with a half-life of 2.3 hours.\",\n      \"method\": \"Scanning mutagenesis of the CT109 epitope, immunoblot and flow cytometry for specificity, internalization kinetics assay\",\n      \"journal\": \"Current cancer drug targets\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — scanning mutagenesis identifies specific glycoepitope, internalization kinetics quantified; single lab\",\n      \"pmids\": [\"38178674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2035,\n      \"finding\": \"CEACAM5 promoter hypomethylation is a major regulatory mechanism controlling CEA expression in colorectal cancer; treatment with the demethylating agent 5-aza-2'-deoxycytidine enhanced CEACAM5/CEA expression in HCT116 and HT29 cells, and CRC patient samples with elevated serum CEA showed lower average CpG methylation at the CEACAM5 promoter. Critical methylation CpG regions were mapped to -200 to -500 bp and -1000 to -1400 bp upstream of the transcription start site.\",\n      \"method\": \"5-Aza-dC demethylation treatment, CpG methylation analysis of CEACAM5 promoter, serum CEA measurement in CRC patients, bisulfite sequencing\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological demethylation with functional CEA expression readout plus mapping of critical CpG regions; validated in both cell lines and patient samples\",\n      \"pmids\": [\"37942534\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CEACAM5 is a GPI-anchored glycoprotein whose expression is transcriptionally regulated by Smad3-mediated TGF-β signaling, HIF1α (downstream of FBW7), ASCL1-driven chromatin remodeling, deltaN-TCF-1B, and promoter DNA methylation status; its membrane-anchored form supports tumor cell adhesion, migration, and primary tumor growth through homotypic and heterotypic interactions, and it functions as a host receptor for bacterial pathogens (Afa/Dr DAEC via GPI clustering, H. pylori CagA T4SS via integrin-β1/CEACAM pathway, and F. nucleatum CbpF via a Velcro-like multivalent interaction involving Q78); on immune cells, CEACAM5 on tumor cells engages the inhibitory receptor CEACAM1 on NK cells to suppress cytotoxicity, and on intestinal epithelial cells CEACAM5 binds CD8α (N-domain, glycan-dependent) and CD1d (B3 domain) to activate CD8+ suppressor T cells; structurally, the A3-B3 domains form a discontinuous epitope (including N-linked mannose at Asn612) recognized by therapeutic antibodies, and tumor-associated CEACAM5 carries distinct glycan modifications (Lewis X/Y, branched N-glycans) that enable DC-SIGN recognition.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CEACAM5 is a GPI-anchored, heavily glycosylated cell-surface glycoprotein that functions as an adhesion molecule and signaling ligand on epithelial and tumor cells, with major roles in tumor progression, immune modulation, and as a receptor for bacterial pathogens [#4, #10, #2]. Its expression is controlled at multiple levels: by Smad3-mediated TGF-\\u03b2 signaling, which induces CEACAM5 and is required for normal CEA expression in vivo [#1]; by HIF1\\u03b1 acting as a direct transcriptional activator downstream of FBW7 [#7]; by ASCL1-driven increases in chromatin accessibility at the core promoter during neuroendocrine reprogramming [#8]; and by promoter CpG hypomethylation, which derepresses CEA expression in colorectal cancer [#21]. The membrane-anchored (not secreted) form specifically supports primary tumor growth, and domain-specific antibody Fabs targeting the N-terminal/A1B1 and A3B3 domains block tumor cell migration, ECM invasion, and endothelial adhesion [#4, #17]. On tumor cells, CEACAM5 engages the inhibitory receptor CEACAM1 on NK cells as an immune checkpoint, and antibody blockade of this heterophilic interaction restores NK cytotoxicity [#10, #11]. On intestinal epithelium, CEACAM5 binds CD8\\u03b1 through its glycosylated N-domain and CD1d through its B3 domain to activate CD8+ suppressor T cells [#0]. CEACAM5 serves as a host receptor for multiple bacteria, mediating Afa/Dr DAEC adhesion via receptor clustering [#2], H. pylori CagA T4SS delivery [#3], and F. nucleatum CbpF binding through the conserved Q78 residue in a multivalent Velcro-like mode [#18]. Tumor-associated CEACAM5 carries distinctive glycans\\u2014Lewis X/Y, branched N-glycans, and mannose\\u2014that confer recognition by the C-type lectin DC-SIGN [#5], and its A3-B3 domains form a discontinuous, glycan-containing epitope (N-linked mannose at Asn612) targeted by therapeutic antibodies [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that CEACAM5 acts as a functional surface receptor for enteric bacteria, not merely a passive adhesion antigen, by showing it is clustered around and required for Afa/Dr DAEC adhesion.\",\n      \"evidence\": \"Stable CD66e transfection of HeLa cells, antibody blocking, and immunofluorescence of receptor clustering in polarized Caco-2/TC7 cells\",\n      \"pmids\": [\"10816511\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the CEACAM5 domain or glycan determinants of bacterial binding\", \"Signaling consequences of clustering not characterized\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Distinguished the membrane-anchored form of CEACAM5 as the species driving primary tumor growth, addressing whether secreted versus surface CEA mediates the oncogenic phenotype.\",\n      \"evidence\": \"Antisense knockdown and xenograft tumor formation in nude mice with subclones producing membrane-bound versus secreted CEACAM5\",\n      \"pmids\": [\"12813580\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which membrane CEACAM5 promotes growth not defined\", \"Single cell line/lab\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapped which CEACAM5 domains mediate distinct adhesive/invasive functions, showing N-terminal/A1B1 epitopes govern migration and ECM invasion while A3B3 governs endothelial adhesion.\",\n      \"evidence\": \"Domain-specific antibody Fabs (MN-3, MN-15, MN-14) in migration, invasion, adhesion assays and an in vivo micrometastasis model\",\n      \"pmids\": [\"16204051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the counter-receptors engaged by each domain\", \"Antibody Fabs may have steric effects beyond their target epitope\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified TGF-\\u03b2/Smad3 as a direct transcriptional driver of CEACAM5, providing the first upstream regulatory pathway.\",\n      \"evidence\": \"Promoter-luciferase assays, T\\u03b2RII/Smad3 rescue in unresponsive gastric cancer lines, and Smad3-null mice\",\n      \"pmids\": [\"17653079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Smad3 binding site on the promoter not delineated\", \"Relationship to other regulators not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated the CEACAM5/CEACAM1 heterophilic interaction is an NK-cell inhibitory checkpoint that can be relieved by antibody blockade, framing CEACAM5 as an immune evasion ligand.\",\n      \"evidence\": \"In vitro NK cytotoxicity assays against MHC-I-deficient CRC cells with anti-CEACAM5 antibody CC4 blocking\",\n      \"pmids\": [\"21731662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro only; no in vivo confirmation\", \"Binding interface between CEACAM5 and CEACAM1 not structurally defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed that tumor-specific glycan remodeling of CEACAM5 creates lectin-recognition determinants, linking aberrant glycosylation to immune recognition.\",\n      \"evidence\": \"Lectin capture ELISA (DC-SIGN, MGL, Galectin-3) on CEACAM5 from matched normal versus tumor CRC tissue from 48 patients\",\n      \"pmids\": [\"21823122\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of DC-SIGN recognition on APC behavior not tested\", \"Glycan structures inferred from lectin binding rather than directly resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the domain and glycan requirements for CEACAM5 engagement of CD8\\u03b1 and CD1d, establishing it as an activating ligand for suppressor CD8+ T cells in the intestine.\",\n      \"evidence\": \"Co-IP, domain deletion mutants, Lck activation assay, and in vitro T cell suppression assays with IL-15/IL-7\",\n      \"pmids\": [\"24104458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of CD8+ suppressor induction not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed CEACAM5 within the FBW7\\u2013HIF1\\u03b1 axis as a direct hypoxia-responsive target gene controlling colorectal cancer cell migration.\",\n      \"evidence\": \"Luciferase reporter and ChIP assays, ectopic FBW7 expression with CEACAM5 silencing and migration assays\",\n      \"pmids\": [\"29910683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HIF1\\u03b1 binding site coordinates not finely mapped\", \"Connection to other CEACAM5 regulators unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed CEACAM5 can promote metastatic outgrowth by driving mesenchymal-to-epithelial transition, contrasting with anti-metastatic roles reported in other cancers.\",\n      \"evidence\": \"Serial in vivo metastasis passaging, in vivo gain-of-function screen, transcriptomics, and patient IHC (inverse CEACAM5/vimentin correlation)\",\n      \"pmids\": [\"29736411\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism linking CEACAM5 to the epithelial program not defined\", \"Apparent context-dependent opposite effects on EMT across tumor types unreconciled\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established CEACAM5 as an essential host receptor for H. pylori T4SS effector delivery, extending its receptor function to a second pathogen system.\",\n      \"evidence\": \"Genetic introduction of CEACAM1/5/6 into T4SS-deficient AZ-521 cells with CagA phosphorylation and vinculin/cortactin dephosphorylation readouts\",\n      \"pmids\": [\"30321907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct bacterial adhesin\\u2013CEACAM5 contact residues not mapped in this study\", \"Mechanism of T4SS coupling to CEACAM5 unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified ASCL1-driven chromatin remodeling at the CEACAM5 promoter as the mechanism elevating CEACAM5 during neuroendocrine transdifferentiation, expanding regulation to a lineage-plasticity context.\",\n      \"evidence\": \"Genetically defined neuroendocrine transdifferentiation assay with chromatin accessibility profiling\",\n      \"pmids\": [\"33199493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ASCL1 occupancy at the promoter not shown\", \"Functional role of elevated CEACAM5 in neuroendocrine cells untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Reinforced the CEACAM5/CEACAM1 NK checkpoint mechanism using a distinct blocking antibody, supporting therapeutic targeting of the interaction.\",\n      \"evidence\": \"In vitro NK-92 cytotoxicity assays with NEO-201 antibody blockade against CEACAM5+ tumor lines\",\n      \"pmids\": [\"31928422\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NK-92 lacks ADCC, so only direct inhibition tested\", \"In vivo efficacy not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified promoter hypomethylation as a major epigenetic switch controlling CEA expression and serum CEA levels in colorectal cancer.\",\n      \"evidence\": \"5-aza-2'-deoxycytidine demethylation in HCT116/HT29 cells, bisulfite CpG mapping, and serum CEA correlation in CRC patients\",\n      \"pmids\": [\"37942534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal demethylation at specific mapped CpGs not directly tested\", \"Interplay with TGF-\\u03b2/HIF1\\u03b1 regulation not integrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the structural basis of therapeutic antibody recognition, defining a discontinuous A3-B3 glycoepitope including N-linked mannose at Asn612.\",\n      \"evidence\": \"3.11 \\u00c5 cryo-EM of CEACAM5 A3-B3/tusamitamab Fab, HDX-MS paratope mapping, and SPR alanine mutagenesis\",\n      \"pmids\": [\"39477960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure limited to A3-B3 fragment, not full-length CEACAM5\", \"Does not address heterophilic counter-receptor interfaces\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided atomic detail of a third pathogen interaction, defining the F. nucleatum CbpF\\u2013CEACAM5 interface and a multivalent Velcro-like adhesion mechanism.\",\n      \"evidence\": \"Structural determination of CbpF\\u2013CEACAM1/CEACAM5 complex with mutagenesis of the EFNGQYQ loop and CEACAM5 Q78\",\n      \"pmids\": [\"40928870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular consequences of multivalent engagement not functionally assayed here\", \"Affinity contributions of individual contacts not quantified\"]\n    },\n    {\n      \"year\": 2035,\n      \"claim\": \"Showed that surface accessibility of CEACAM5, governed by junctional sequestration and glycocalyx, is a rate-limiting determinant of anti-CEACAM5 CAR T cell activation.\",\n      \"evidence\": \"Live-cell calcium imaging, CEACAM5 localization microscopy, and trypsin/hyaluronidase rescue with cytotoxicity and TNF-\\u03b1 readouts in CRC monolayers\",\n      \"pmids\": [\"41572139\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of junctional CEACAM5 sequestration not molecularly defined\", \"Single-lab model system\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the diverse, context-dependent CEACAM5 phenotypes (pro- versus anti-metastatic, immune-suppressive versus inflammatory) are integrated through a unified downstream signaling logic.\",\n      \"evidence\": \"No single study in the corpus reconciles the opposing functional outcomes across tissue and tumor contexts\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No defined cytoplasmic signaling output for a GPI-anchored protein\", \"Counter-receptor stoichiometry and downstream effectors largely uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2, 3, 18]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [4, 17]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 4, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 10, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 3, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 7, 8, 21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CEACAM1\", \"CD8A\", \"CD1D\", \"LGALS9\", \"LGALS3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}