{"gene":"ICAM2","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1989,"finding":"ICAM-2 was identified as a second ligand for the integrin LFA-1 (CD11a/CD18). ICAM-2 is an integral membrane protein with two immunoglobulin-like domains, closely related to the two N-terminal domains of ICAM-1 (34% identity), and mediates LFA-1-dependent cell adhesion.","method":"Functional cloning using a novel ligand-identification method; COS cell transfection and cell adhesion assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — original functional cloning with cell adhesion assays, widely replicated across subsequent studies","pmids":["2497351"],"is_preprint":false},{"year":1991,"finding":"A blocking anti-ICAM-2 monoclonal antibody (CBR-IC2/2) totally inhibited binding of ICAM-2+ COS cells to purified LFA-1, confirming ICAM-2 as a direct LFA-1 ligand. ICAM-1 and ICAM-2 together account for all LFA-1-dependent binding to endothelium, but an additional LFA-1 ligand (ICAM-3) was implicated on some cell lines.","method":"Monoclonal antibody generation, immunoprecipitation, cell binding assays to purified LFA-1, mAb blocking experiments","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal blocking mAb and cell binding to purified protein, replicated across multiple cell types","pmids":["1676048"],"is_preprint":false},{"year":1995,"finding":"ICAM-2 (CD102) binds to the leukocyte integrin CD11b/CD18 (Mac-1) through the CD11b A domain. A 22-amino acid peptide (P1) derived from the first Ig domain of ICAM-2 also binds to purified CD11b/CD18.","method":"Cell adhesion assays with purified integrins, peptide competition, blocking with anti-CD11b A domain antibodies","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding to purified protein, domain-mapping with blocking antibodies, single lab","pmids":["7561061"],"is_preprint":false},{"year":1993,"finding":"A synthetic peptide from ICAM-2 spanning residues 21-42 of the first immunoglobulin domain binds to purified CD11a/CD18 (LFA-1) and inhibits adhesion of endothelial cells to this integrin and B lymphoblastoid cell binding to endothelium.","method":"Peptide synthesis, binding assay to purified CD11a/CD18, cell adhesion inhibition assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified integrin and synthetic peptide, single lab","pmids":["8349630"],"is_preprint":false},{"year":1997,"finding":"Crystal structure of the extracellular region of ICAM-2 was determined. Glu-37 is critical for LFA-1 binding and is proposed to coordinate the Mg2+ ion in the LFA-1 I domain. The LFA-1 recognition surface is relatively flat and the critical Glu lies in a beta-strand (unlike VCAM-1/fibronectin where critical Asp is in a loop). A bend between domains 1 and 2 and N-linked glycans in domain 2 present the recognition surface to LFA-1.","method":"X-ray crystallography of extracellular ICAM-2","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure determination, structurally validated binding site","pmids":["9153399"],"is_preprint":false},{"year":1999,"finding":"Mutagenesis of ICAM-2 based on its crystal structure localized the LFA-1 binding site to a diagonal band across the GFC beta-sheet and CD edge of domain 1, with Glu-37 ligating Mg2+ in the I domain. The binding site is confined to the upper part of domain 1, distinct from the VCAM-1 binding site for alpha4 integrins.","method":"Site-directed mutagenesis of ICAM-2 guided by crystal structure; LFA-1 binding assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure-guided mutagenesis with functional binding assays, validated by structural comparison","pmids":["10077629"],"is_preprint":false},{"year":1996,"finding":"ICAM-2 cytoplasmic domain (amino acids 231-254) binds alpha-actinin. The minimal binding region was mapped to ICAM-2 residues 241-248. Colocalization of ICAM-2 and alpha-actinin was demonstrated in Eahy926 cells, suggesting alpha-actinin links ICAM-2 to the actin cytoskeleton.","method":"Affinity peptide pulldown from placental lysates, immunoblotting with anti-alpha-actinin, confocal microscopy colocalization, bacterially expressed alpha-actinin fusion proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — affinity pulldown with domain mapping, colocalization, and binding to purified recombinant protein, single lab","pmids":["8824270"],"is_preprint":false},{"year":1998,"finding":"ERM proteins (ezrin/radixin/moesin) bind to a positively charged amino acid cluster in the juxtamembrane cytoplasmic domain of ICAM-2. GST-fusion of ICAM-2 cytoplasmic domain bound moesin in vitro. E-cadherin chimeras bearing the ICAM-2 cytoplasmic sequence co-concentrated with ERM proteins at microvilli; deletion of the positively charged cluster abolished this. Binding was confirmed by co-immunoprecipitation and site-directed mutagenesis.","method":"GST pulldown, co-immunoprecipitation, site-directed mutagenesis, chimeric protein expression in L fibroblasts, confocal microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (pulldown, co-IP, mutagenesis, chimera localization), replicated by independent group (PMID:9705328)","pmids":["9472040"],"is_preprint":false},{"year":1998,"finding":"Ezrin interacts directly with ICAM-2 cytoplasmic tail. The interaction was demonstrated by affinity precipitation, microtiter binding assay, co-immunoprecipitation, and surface plasmon resonance (KD = 3.3 × 10^-7 M). PtdIns(4,5)P2 enhanced the ICAM-2-ezrin interaction, and ICAM-2 cytoplasmic tail directly binds PtdIns(4,5)P2. ICAM-2 and ezrin co-localize in microvillar projections of transfected cells.","method":"Affinity precipitation, microtiter binding assay, co-immunoprecipitation, surface plasmon resonance, cell transfection with localization analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal binding methods including SPR with KD determination, phosphoinositide binding assay, confirmed by independent lab","pmids":["9705328"],"is_preprint":false},{"year":1996,"finding":"NK cell-mediated killing depends on ICAM-2 and is regulated by ICAM-2 distribution. In NK-sensitive cells, ICAM-2 is concentrated in uropod-like projections with ezrin. Transfection of ezrin into NK-resistant cells induced uropod formation, redistribution of ICAM-2, and sensitized cells to IL-2-activated killing.","method":"Ezrin transfection into NK-resistant cells, NK cytotoxicity assays, confocal microscopy of ICAM-2 and ezrin localization","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional transfection experiment with mechanistic readout (NK killing + ICAM-2 redistribution), published in high-tier journal","pmids":["8717043"],"is_preprint":false},{"year":2002,"finding":"ICAM-2 activates the PI3K/AKT pathway. ICAM-2 induced tyrosine phosphorylation of ezrin and PI3K membrane translocation, resulting in PIP3 production, PDK-1 and AKT activation, and phosphorylation of AKT targets BAD, GSK3, and FKHR. ICAM-2 clustering protected primary human CD19+ cells from TNFα- and Fas-mediated apoptosis. ICAM-2 engagement by its natural receptor LFA-1 on CD4+ T cells specifically induced AKT activity.","method":"Genetic screen for PI3K/AKT activators, biochemical assays for ezrin phosphorylation/PI3K translocation/PIP3/PDK-1/AKT activation, apoptosis assays, single-cell analysis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic screen followed by multiple orthogonal biochemical assays and functional apoptosis readout, published in high-tier journal","pmids":["11825565"],"is_preprint":false},{"year":2002,"finding":"ICAM-1 cross-linking activates RhoA and induces stress fiber formation and c-fos/rhoA transcription in endothelial cells. In contrast, ICAM-2 cross-linking does NOT activate RhoA or alter actin cytoskeletal organization in HUVECs, despite both ICAM-1 and ICAM-2 localizing with moesin in apical microvilli at baseline.","method":"ICAM cross-linking with antibodies, RhoA activity assay, actin staining, transcription reporter assays, confocal microscopy","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct functional comparison of ICAM-1 and ICAM-2 with RhoA activity assays and cytoskeletal readouts, negative result for ICAM-2 RhoA activation rigorously established","pmids":["12097408"],"is_preprint":false},{"year":2005,"finding":"Endothelial ICAM-2 regulates angiogenesis. ICAM-2-deficient mice and ICAM-2-deficient endothelial cells show impaired angiogenesis in vitro and in vivo. ICAM-2 supports homophilic interaction (involved in tube formation), supports cell migration, protects against apoptosis (serum deprivation, anti-Fas, staurosporine), and activates the small GTPase Rac, which is required for tube formation and migration.","method":"ICAM-2 knockout mice, ICAM-2-deficient endothelial cells, in vitro tube formation assay, in vivo angiogenesis assay, cell migration assay, apoptosis assays, Rac GTPase activity assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mice + deficient cells + multiple orthogonal functional assays including Rac activation, in vitro and in vivo evidence","pmids":["15920013"],"is_preprint":false},{"year":2014,"finding":"ICAM-2 regulates endothelial barrier function and vascular permeability through a pathway involving N-cadherin, ERM proteins, and Rac-1 signaling. ICAM-2 lacking ERM-binding site or cytoplasmic tail failed to restore junctions and Rac-1 activation in ICAM-2-deficient cells. In vivo, thrombin-induced vascular permeability was increased in ICAM-2-deficient mice.","method":"siRNA knockdown, ICAM-2 knockout endothelioma lines, re-expression of full-length vs. mutant ICAM-2, transendothelial electrical resistance, intravital fluorescence microscopy for permeability, Rac-1 activity assay","journal":"Cell communication and signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout cells + in vivo permeability + domain mutants identifying ERM-binding and cytoplasmic tail as required for Rac-1 activation and junction formation","pmids":["24593809"],"is_preprint":false},{"year":1998,"finding":"TNF-α and IL-1β down-regulate ICAM-2 expression at the transcriptional level in HUVECs (to ~50% of control surface expression; mRNA reduced to ~40% of control). Inflammatory cytokines reduce ICAM-2 promoter activity. ICAM-2 localizes mainly at endothelial cell junctions and this junctional expression is markedly decreased by cytokine treatment. IFN-γ had no effect on ICAM-2 expression.","method":"Flow cytometry, Northern blotting, ICAM-2 promoter reporter assays in HUVECs, immunocytochemistry","journal":"Cell adhesion and communication","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter + mRNA + surface protein assays, single lab, multiple methods","pmids":["10223354"],"is_preprint":false},{"year":1999,"finding":"TNF-α-mediated down-regulation of the ICAM-2 promoter involves three Ets transcription factor binding sites (EBS). Two of these EBS are involved in TNF-α-induced down-regulation. The Ets family member Erg is constitutively expressed in HUVECs, binds the EBS, and transactivates the ICAM-2 promoter. TNF-α down-regulates Erg protein levels, and ICAM-2 and Erg expression are co-regulated in an ex vivo artery model.","method":"Site-directed mutagenesis of ICAM-2 promoter, EMSA, Erg cDNA transactivation assays in HeLa and HUVEC, Western blotting for Erg protein, ex vivo artery model","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis + EMSA + transactivation assays, single lab, multiple methods","pmids":["10574717"],"is_preprint":false},{"year":1998,"finding":"ICAM-2 promoter activity in endothelial cells requires Sp1 motif at -194 and GATA motifs at -145 and -53 (each contributing 61-78% of activity). Mutation of an 8-bp palindrome at -268 also reduced activity by 70%. Specific binding of endothelial nuclear proteins to these sites was demonstrated. GATA-2 overexpression transactivated the ICAM-2 promoter 3-4-fold in COS cells.","method":"Promoter reporter gene assays, site-directed mutagenesis, gel shift (EMSA) analysis, GATA-2 transactivation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis + EMSA + transactivation assays, single lab, multiple orthogonal approaches","pmids":["9565596"],"is_preprint":false},{"year":1998,"finding":"ICAM-1 and ICAM-2 (but not PECAM-1, VCAM-1, or E-selectin) are essential for transendothelial migration of T cells. In the absence of ICAM-1, only ICAM-2 mediates transendothelial migration. This was established using ICAM-1-deficient endothelioma cells and rescue by retroviral transfer of wild-type ICAM-1.","method":"ICAM-1-deficient endothelioma cells from knockout mice, retroviral rescue with wild-type ICAM-1, transendothelial migration assay, blocking antibodies","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout cells + retroviral rescue + mAb blocking, replicated in subsequent studies","pmids":["9808177"],"is_preprint":false},{"year":1999,"finding":"Endothelial ICAM-1 and ICAM-2 are equally required for transendothelial migration of thymocytes and T lymphoma cells, in addition to CD4+ memory T cells, demonstrating that this requirement is not T cell subset-specific.","method":"ICAM-1-deficient endothelioma cells, transendothelial migration assay with different T cell populations","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout endothelial cells, multiple T cell populations, single lab","pmids":["10464174"],"is_preprint":false},{"year":1999,"finding":"ICAM-2-deficient mice exhibit prolonged accumulation of eosinophils in lung interstitium and delayed eosinophil transmigration into the airway lumen during allergic lung inflammation, resulting in prolonged heightened airway hyperresponsiveness. This phenotype is due to lack of ICAM-2 on non-hematopoietic (endothelial) cells; ICAM-2 deficiency on endothelial cells reduces eosinophil transmigration in vitro. ICAM-2 is not essential for lymphocyte homing but is required for megakaryocyte progenitor numbers.","method":"ICAM-2 knockout mice, allergic lung disease model, in vitro eosinophil transmigration assay, bone marrow analysis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — ICAM-2 knockout mice with in vivo inflammatory model + in vitro transmigration assay + cell-specific reconstitution evidence","pmids":["10023766"],"is_preprint":false},{"year":2009,"finding":"ICAM-2, JAM-A, and PECAM-1 act sequentially to mediate neutrophil transmigration in response to IL-1β but not TNF-α stimulation. When TNF-α direct stimulation of neutrophils is blocked, TNF-α-induced neutrophil transmigration becomes dependent on these molecules. Analysis of neutrophil arrest sites in ICAM-2-/-, JAM-A-/-, and PECAM-1-/- mice showed sequential roles.","method":"ICAM-2-/-, JAM-A-/-, PECAM-1-/- mice, cell-transfer technique, fluorescence intravital microscopy of cremaster venules","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple knockout mouse strains + intravital microscopy + cell transfer technique establishing sequential pathway","pmids":["19211506"],"is_preprint":false},{"year":2010,"finding":"Endothelial ICAM-2 (but not VCAM-1) mediates T cell polarization and crawling on BBB endothelium. T cell arrest is mediated by ICAM-1 and VCAM-1, while T cell polarization and crawling require ICAM-1 and ICAM-2. This dissects sequential roles: arrest (ICAM-1/VCAM-1) then crawling (ICAM-1/ICAM-2) prior to diapedesis.","method":"Wild-type, ICAM-1-/-, ICAM-2-/-, and ICAM-1/ICAM-2 double-deficient primary mouse brain microvascular endothelial cells; live cell imaging under physiological flow conditions","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple knockout endothelial cell lines + live imaging under flow, dissecting distinct functional steps","pmids":["20861356"],"is_preprint":false},{"year":2013,"finding":"β2 integrin-mediated neutrophil crawling on endothelial ICAM-1 and ICAM-2 is a prerequisite for transcellular neutrophil diapedesis across the inflamed BBB. In the absence of crawling, neutrophils undergo only paracellular diapedesis. Crawling is mediated by endothelial ICAM-1 and ICAM-2 and neutrophil LFA-1 and Mac-1.","method":"Wild-type, CD11a-/-, CD11b-/-, CD18-null neutrophils with wild-type, JAM-A-/-, ICAM-1-null, ICAM-2-/-, ICAM-1/ICAM-2-double-null endothelial cells; live-cell imaging under physiological flow","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — comprehensive genetic dissection with multiple knockout combinations + live imaging, establishing mechanistic prerequisite relationship","pmids":["24259506"],"is_preprint":false},{"year":2013,"finding":"ICAM-2 has functional roles in luminal neutrophil crawling in vivo: blockade of ICAM-2 reduced crawling velocity, increased stop-start crawling profile, prolonged neutrophil interaction at EC junctions prior to TEM, and reduced overall extravasation. Some ICAM-2-dependent functions are mediated through Mac-1 ligation.","method":"Real-time in vivo confocal microscopy of neutrophil-vessel interactions; functional and genetic ICAM-2 blockade; Mac-1 pharmacological inhibition","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — real-time in vivo intravital confocal microscopy with both functional and genetic blockade","pmids":["24317296"],"is_preprint":false},{"year":2007,"finding":"DC-SIGN on dendritic cells binds to the Lewis Y (LeY) glycan epitope on ICAM-2 on endothelial cells to mediate DC rolling and adhesion on endothelium under shear flow. The interaction is strictly glycan-specific; ICAM-2 on CHO cells serves as a DC-SIGN ligand only when properly glycosylated. FUT1 directs LeY expression; FUT1 silencing reduces DC rolling/adhesion.","method":"DC-SIGN/ICAM-2 adhesion assays under shear flow, CHO cell transfection with ICAM-2 ± glycosylation, FUT1 siRNA knockdown, antibody blocking","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional adhesion assays under flow + glycosylation manipulation + siRNA knockdown, single lab with multiple orthogonal methods","pmids":["18155766"],"is_preprint":false},{"year":2004,"finding":"Sialylation of platelet ICAM-2 impairs its ability to support leukocyte adhesion. Platelet ICAM-2 is more acidic than endothelial ICAM-2 due to cell-specific N-linked glycosylation (sialylation). Platelet ICAM-2 supports 50% less T cell adhesion via LFA-1 and no DC adhesion via DC-SIGN compared to endothelial ICAM-2. Neuraminidase treatment abolished these differences.","method":"Isoelectric focusing, N-glycanase/neuraminidase treatment, purified protein adhesion assays, T cell and DC adhesion to immobilized ICAM-2","journal":"Inflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical characterization of glycoforms + functional adhesion assays with enzymatic manipulation, single lab","pmids":["15673159"],"is_preprint":false},{"year":2001,"finding":"Crystals of the complex between the radixin FERM domain and the full-length 28-residue cytoplasmic tail of ICAM-2 were obtained, with data collected to 2.60 Å resolution, establishing the structural basis for ERM-ICAM-2 interaction.","method":"X-ray crystallography of radixin FERM domain / ICAM-2 cytoplasmic tail complex","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure reported but only crystallographic characterization abstract, full functional validation not described in this paper","pmids":["11375520"],"is_preprint":false},{"year":1999,"finding":"Soluble ICAM-2Fc and a peptide from the first Ig domain of ICAM-2 (P1) can activate integrin affinity in T lymphocytes, inducing CD11/CD18-dependent adhesion to immobilized ICAMs. The activation is energy-, divalent cation-, temperature-, and cytoskeleton-dependent. ICAM-2Fc is a more potent activator of integrin affinity than ICAM-1Fc or ICAM-3Fc.","method":"T lymphocyte adhesion assays to purified ICAMs, soluble ICAM-Fc binding assays, cytoskeletal inhibitors, kinase inhibitors","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vitro assays with purified proteins and inhibitor dissection, single lab","pmids":["10352278"],"is_preprint":false},{"year":1995,"finding":"An ICAM-2 peptide (residues 21-42) activates NK cell migration (up to 215% of control), induces F-actin polymerization at the leading edge, increases phosphorylation of 150- and 35-kDa proteins, and this migration activation is inhibited by anti-CD11a monoclonal antibodies. This effect is mediated through CD11a/CD18 ligation without receptor recycling.","method":"Boyden chamber migration assay, F-actin staining, phosphotyrosine immunoblotting, anti-CD11a blocking antibodies, receptor recycling assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional peptide stimulation assays with signaling readouts and antibody blocking, single lab","pmids":["7721764"],"is_preprint":false},{"year":2008,"finding":"ICAM-2 forms a complex with alpha-actinin and actin in neuroblastoma cells, linking the membrane to the actin cytoskeleton. ICAM-2 expression limited cell motility, redistributed actin fibers in vitro, and suppressed disseminated tumor formation in vivo in a metastatic neuroblastoma model.","method":"Co-immunoprecipitation, competitive peptide assays, in vitro cell migration assay, actin fiber staining, in vivo metastasis model","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP + competitive peptide + in vitro and in vivo functional assays demonstrating complete membrane-linker-actin linkage with phenotypic consequence","pmids":["18978946"],"is_preprint":false},{"year":2014,"finding":"The interaction of ICAM-2 with alpha-actinin through its cytoplasmic domain is required for ICAM-2 to confer a non-metastatic phenotype in neuroblastoma cells in vivo. ICAM-2 variants with mutated alpha-actinin-binding domains inhibited cell adhesion, migration, and colony growth in vitro similarly to WT, but unlike WT failed to completely suppress disseminated tumor development in vivo. Both alpha-actinin-dependent and alpha-actinin-independent mechanisms contribute to ICAM-2 function.","method":"In silico domain analysis, site-directed mutagenesis of alpha-actinin-binding domain, co-precipitation assays, cell migration and adhesion assays, in vivo metastasis model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — mutagenesis of specific binding domain + co-precipitation + in vitro and in vivo functional assays, mechanistically dissecting alpha-actinin-dependent vs independent effects","pmids":["24704826"],"is_preprint":false},{"year":2013,"finding":"N-glycosylation of ICAM-2 is required for complete suppression of metastatic potential in neuroblastoma cells. Hypo- or non-glycosylated ICAM-2 variants (alanine substitutions at N47, N82, N105, N153, N178, N187) significantly attenuated but did not abolish ICAM-2's ability to suppress metastatic properties. Glycosylation status did not affect ICAM-2 interaction with alpha-actinin.","method":"Site-directed mutagenesis of N-linked glycosylation sites, cell migration assay, anchorage-independent growth, F-actin distribution, co-immunoprecipitation with alpha-actinin, in vivo metastasis model","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic site-directed mutagenesis + in vitro and in vivo functional assays, single lab","pmids":["23714211"],"is_preprint":false},{"year":2022,"finding":"ICAM2 promotes RA-FLS proliferation, migration, and invasion via the ICAM2/PI3K/AKT/p300 pathway. ATT inhibits METTL3-mediated N6-methyladenosine (m6A) methylation of ICAM2 mRNA in RA-FLSs, thereby suppressing ICAM2 expression and downstream signaling. p300 directly facilitates METTL3 transcription, forming a feedback loop with ICAM2.","method":"RNA-seq, siRNA knockdown, plasmid overexpression, methylated RNA immunoprecipitation (MeRIP), chromatin immunoprecipitation (ChIP), luciferase reporter, cell proliferation/migration/invasion assays, CIA mouse model","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (MeRIP, ChIP, luciferase, KD/OE) in single lab establishing m6A regulation of ICAM2 mRNA and downstream pathway","pmids":["36536495"],"is_preprint":false},{"year":2023,"finding":"ICAM2 promotes leptomeningeal metastasis of TNBC by mediating adhesion to and trans-BCB migration across the blood-CSF barrier via homophilic or heterophilic interaction with ICAM1 in choroid plexus epithelial cells. ICAM2 also conferred cancer stem cell properties. Neutralizing ICAM2 attenuated LM progression in vivo.","method":"Proteomic analysis, pull-down assay, antibody neutralization, in vitro trans-BCB migration assay, in vivo spinal cord colonization model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pull-down + antibody blocking + in vitro and in vivo migration assays, single lab","pmids":["37620448"],"is_preprint":false},{"year":2008,"finding":"Epithelial ICAM-2 (but not ICAM-3) is expressed on bronchial epithelium and together with ICAM-1 mediates T cell egression across the bronchial epithelium via LFA-1. Blocking both ICAM-1 and ICAM-2 inhibited egression by ~70%, and LFA-1/ICAM interactions on the basolateral epithelium enable recognition of interepithelial junctions but not adhesion/polarization per se.","method":"In vitro trans-epithelial migration assay, blocking antibodies against ICAM-1, ICAM-2, ICAM-3, LFA-1; step analysis of adhesion, polarization, and diapedesis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — blocking antibody functional dissection with step-specific readouts, single lab","pmids":["18842965"],"is_preprint":false},{"year":1998,"finding":"LFA-1/ICAM-1 or LFA-1/ICAM-2 interactions deliver a negative regulatory signal for Th2 cytokine production. Blocking LFA-1/ICAM-1 or LFA-1/ICAM-2 interactions increased Th2 cytokines (IL-4, IL-5) 15- to 40-fold; combined blockade of both led to 100- to 1,000-fold increase, demonstrating synergistic Th2-suppressive roles.","method":"T cells from DO11.10 TCR transgenic mice stimulated by dendritic cells; blocking monoclonal antibodies to LFA-1, ICAM-1, ICAM-2; cytokine ELISAs","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — blocking antibody functional dissection with cytokine readout, defined cellular system, single lab","pmids":["9820482"],"is_preprint":false},{"year":1997,"finding":"ICAM-2 provides a costimulatory signal for T cell stimulation by allogeneic class II MHC in an LFA-1-dependent manner. ICAM-2 transfection on MHC II-expressing L cells enhanced T cell proliferation similarly to ICAM-1. ICAM-2-stimulated T cells mounted a secondary allogeneic response, whereas T cells stimulated without ICAM-1/-2 did not, suggesting ICAM-2 prevents anergy.","method":"ICAM-2 transfection into MHC II+ L cells, mixed lymphocyte reaction, thymidine incorporation, secondary stimulation assays","journal":"Scandinavian journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transfection-based functional assay with primary and secondary response readouts, single lab","pmids":["9122613"],"is_preprint":false},{"year":2010,"finding":"ICAM-2 (Icam2) is expressed on hemogenic endothelium during embryonic hematopoiesis and marks the transition from hemangioblast to hemogenic endothelium. Its expression persists on fetal liver hematopoietic progenitors. Sequential CD40 then Icam2 expression defines progressive steps in blood specification from mesoderm.","method":"Embryonic stem cell differentiation in serum-free culture, in vitro and in vivo lineage analysis, cell surface marker characterization, hematopoietic progenitor assays","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional stem cell differentiation assays with in vitro and in vivo validation defining surface marker role in lineage specification","pmids":["20506544"],"is_preprint":false},{"year":2008,"finding":"Downregulation of ICAM2 by siRNA enhanced radiosensitivity of OSCC cells with increased apoptosis via AKT phosphorylation (Ser473) and caspase-3 activation. Overexpression of ICAM2 conferred resistance to X-ray irradiation, suggesting ICAM2 promotes cell survival through AKT signaling.","method":"siRNA knockdown, ICAM2 overexpression, X-ray irradiation, apoptosis assays, Western blot for phospho-AKT and caspase-3","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (KD and OE) with AKT/caspase signaling readouts, single lab","pmids":["18349842"],"is_preprint":false},{"year":1991,"finding":"ICAM-2 peptide 2 (residues spanning a specific region) mediates lymphocyte adhesion through both CD11/CD18 (β2 integrin) and CD49d/CD29 (VLA-4) integrins. Blocking both anti-CD18 and anti-CD29 antibodies together caused near-complete inhibition of cell attachment to the peptide.","method":"Synthetic ICAM-2 peptides, cell attachment assays, blocking monoclonal antibodies to CD11/CD18 and CD49d/CD29","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single blocking antibody approach with synthetic peptide, single lab, not confirmed by direct binding to purified VLA-4","pmids":["1709118"],"is_preprint":false}],"current_model":"ICAM-2 (CD102) is a two-Ig-domain transmembrane glycoprotein that functions as a constitutively expressed ligand for LFA-1 (CD11a/CD18) and Mac-1 (CD11b/CD18) integrins (with Glu-37 in domain 1 coordinating Mg2+ in the integrin I domain as revealed by crystal structure), and for DC-SIGN via Lewis Y glycans; its short cytoplasmic tail links to the actin cytoskeleton through direct binding to ERM proteins (via a juxtamembrane positively charged cluster regulated by PtdIns(4,5)P2) and to alpha-actinin; outside-in signaling through ICAM-2 activates the PI3K/AKT pathway (via ezrin tyrosine phosphorylation) to inhibit apoptosis, and activates Rac to support endothelial migration, tube formation, and vascular barrier function, while notably failing to activate RhoA (in contrast to ICAM-1); at the tissue level, ICAM-2 mediates leukocyte crawling and sequential steps of transmigration across vascular and epithelial barriers, regulates angiogenesis, eosinophil trafficking, and NK cell recognition of redistributed ICAM-2 in uropods, and in tumor cells interacts with alpha-actinin to suppress the metastatic phenotype."},"narrative":{"mechanistic_narrative":"ICAM-2 (CD102) is a constitutively expressed two-Ig-domain transmembrane adhesion glycoprotein that serves as a counter-receptor for leukocyte β2 integrins and thereby governs leukocyte trafficking, vascular biology, and immune cell signaling [PMID:2497351, PMID:7561061]. It was originally identified as a second ligand for LFA-1 (CD11a/CD18), structurally related to the N-terminal domains of ICAM-1 [PMID:2497351, PMID:1676048], and also binds Mac-1 (CD11b/CD18) through its first Ig domain [PMID:7561061]. Crystallographic and structure-guided mutagenesis studies localized the integrin recognition surface to a flat band across domain 1, with Glu-37 coordinating the Mg2+ ion in the LFA-1 I domain [PMID:9153399, PMID:10077629]. Its glycosylation state tunes ligand activity: properly glycosylated ICAM-2 bearing Lewis Y presents a glycan-specific ligand for DC-SIGN, while cell-type-specific sialylation reduces its capacity to support leukocyte adhesion [PMID:18155766, PMID:15673159]. The short cytoplasmic tail couples ICAM-2 to the actin cytoskeleton through direct, PtdIns(4,5)P2-regulated binding of ERM proteins (ezrin/moesin) at a juxtamembrane positively charged cluster and through binding to alpha-actinin [PMID:9472040, PMID:9705328, PMID:8824270]. Outside-in signaling through ICAM-2 drives ezrin tyrosine phosphorylation, PI3K membrane recruitment, and AKT activation to suppress apoptosis, and activates Rac—but not RhoA—to support endothelial migration, tube formation, and vascular barrier integrity [PMID:11825565, PMID:12097408, PMID:15920013, PMID:24593809]. At the tissue level ICAM-2 mediates leukocyte crawling and sequential transmigration steps across vascular and epithelial barriers, regulates angiogenesis and eosinophil trafficking, and contributes to NK recognition and T cell costimulation [PMID:10023766, PMID:20861356, PMID:24259506, PMID:18842965, PMID:8717043]. In tumor cells, the ICAM-2–alpha-actinin–actin linkage suppresses the metastatic phenotype [PMID:18978946, PMID:24704826]. ICAM-2 promoter activity is endothelially programmed by Sp1, GATA, and Ets factors and is down-regulated by inflammatory cytokines [PMID:10574717, PMID:9565596, PMID:10223354]. No Mendelian disease link is established in the available corpus.","teleology":[{"year":1989,"claim":"Establishing that LFA-1 has a second cellular ligand answered why LFA-1-dependent adhesion persisted in settings of limited ICAM-1, defining ICAM-2 as a distinct adhesion receptor.","evidence":"Functional cloning, COS cell transfection and cell adhesion assays","pmids":["2497351"],"confidence":"High","gaps":["Did not map the integrin-binding residues","Cellular and tissue distribution not yet defined"]},{"year":1991,"claim":"Reciprocal blocking and binding to purified LFA-1 confirmed ICAM-2 as a direct, not indirect, LFA-1 ligand and placed it alongside ICAM-1 as accounting for LFA-1 binding to endothelium.","evidence":"Blocking mAb (CBR-IC2/2), immunoprecipitation, cell binding to purified LFA-1","pmids":["1676048"],"confidence":"High","gaps":["An additional LFA-1 ligand on some lines remained unaccounted for","Affinity and structural basis of binding undefined"]},{"year":1995,"claim":"Mapping ICAM-2 binding to the CD11b A domain broadened its receptor repertoire beyond LFA-1 to include Mac-1, relevant for myeloid adhesion.","evidence":"Adhesion assays with purified integrins, peptide competition, anti-CD11b A-domain blocking","pmids":["7561061"],"confidence":"High","gaps":["Relative physiological contribution of Mac-1 vs LFA-1 binding not resolved","Single lab"]},{"year":1997,"claim":"The crystal structure defined the molecular architecture of the integrin recognition surface, showing Glu-37 positioned to coordinate the I-domain Mg2+ and distinguishing ICAM-2's binding mode from VCAM-1/fibronectin.","evidence":"X-ray crystallography of extracellular ICAM-2; structure-guided mutagenesis with LFA-1 binding assays","pmids":["9153399","10077629"],"confidence":"High","gaps":["No co-crystal of the ICAM-2/LFA-1 complex","Conformational changes upon binding not captured"]},{"year":1998,"claim":"Identifying ERM and alpha-actinin binding to the cytoplasmic tail explained how ICAM-2 physically anchors to the cortical actin cytoskeleton and localizes to microvilli.","evidence":"GST pulldown, co-IP, SPR (KD = 3.3×10^-7 M), PtdIns(4,5)P2 binding, mutagenesis, chimera localization; alpha-actinin affinity pulldown and colocalization","pmids":["9472040","9705328","8824270"],"confidence":"High","gaps":["Functional consequence of cytoskeletal coupling not yet defined","Crystallographic detail of the FERM-tail interaction came later (PMID 11375520)"]},{"year":1996,"claim":"Linking ICAM-2 redistribution into ezrin-rich uropods to NK killing connected the cytoskeletal anchorage to an immune effector function.","evidence":"Ezrin transfection into NK-resistant cells, cytotoxicity assays, confocal localization","pmids":["8717043"],"confidence":"High","gaps":["Downstream signaling from redistributed ICAM-2 not defined","NK receptor engaging ICAM-2 not identified here"]},{"year":2002,"claim":"Demonstrating that ICAM-2 engagement activates PI3K/AKT and that it fails to activate RhoA established outside-in signaling distinct from ICAM-1 and a pro-survival role.","evidence":"Genetic screen, ezrin phosphorylation/PIP3/PDK-1/AKT biochemistry, apoptosis assays; ICAM cross-linking with RhoA activity and actin readouts","pmids":["11825565","12097408"],"confidence":"High","gaps":["Direct molecular link between ezrin phosphorylation and PI3K recruitment not fully resolved","Why ICAM-2 cannot activate RhoA mechanistically unexplained"]},{"year":2005,"claim":"Knockout mice and deficient endothelial cells showed ICAM-2 drives Rac-dependent angiogenesis, migration, tube formation, and survival, defining an endothelial-autonomous role beyond leukocyte adhesion.","evidence":"ICAM-2 knockout mice and cells, tube formation, in vivo angiogenesis, migration, apoptosis, Rac activity assays","pmids":["15920013"],"confidence":"High","gaps":["The homophilic interaction inferred for tube formation not structurally characterized","Upstream activator of Rac downstream of ICAM-2 unspecified"]},{"year":2014,"claim":"Domain-mutant rescue established that the ERM-binding site and cytoplasmic tail are required for ICAM-2 to maintain endothelial junctions and barrier function via N-cadherin and Rac-1.","evidence":"Knockout endothelioma lines, full-length vs mutant re-expression, TEER, intravital permeability, Rac-1 assay","pmids":["24593809"],"confidence":"High","gaps":["Mechanism linking ICAM-2 tail to N-cadherin not detailed","Whether ligand engagement is required for barrier function unclear"]},{"year":1999,"claim":"Cytokine-driven transcriptional control via Ets/Erg, Sp1, and GATA sites explained how endothelial ICAM-2 levels are programmed and reduced during inflammation, opposite to ICAM-1.","evidence":"Promoter reporter assays, EMSA, site-directed mutagenesis, GATA-2/Erg transactivation, Northern blot, flow cytometry","pmids":["10223354","10574717","9565596"],"confidence":"Medium","gaps":["Single-lab promoter studies","In vivo relevance of each transcription factor not tested genetically"]},{"year":1999,"claim":"Knockout and rescue work established that endothelial ICAM-2, redundantly with ICAM-1, is required for transendothelial migration and physiological eosinophil/leukocyte trafficking.","evidence":"ICAM-1-deficient endothelioma + retroviral rescue; ICAM-2 knockout mice in allergic lung model and transmigration assays","pmids":["9808177","10464174","10023766"],"confidence":"High","gaps":["Molecular signaling driving the migration step not dissected here","Relative ICAM-1/ICAM-2 contribution varies by stimulus"]},{"year":2013,"claim":"Multi-knockout intravital and flow imaging dissected ICAM-2's sequential roles in leukocyte crawling, defining crawling as a prerequisite for transcellular diapedesis distinct from the arrest step.","evidence":"Knockout mouse strains and endothelial cell combinations, cell transfer, intravital and flow live imaging","pmids":["19211506","20861356","24259506","24317296"],"confidence":"High","gaps":["Signaling events coordinating crawling-to-diapedesis transition incomplete","Stimulus-specificity (IL-1β vs TNF-α) mechanism unresolved"]},{"year":2008,"claim":"Defining the ICAM-2–alpha-actinin–actin complex and N-glycosylation requirement showed ICAM-2 acts as a metastasis suppressor through cytoskeletal coupling.","evidence":"Co-IP, competitive peptides, alpha-actinin-binding and glycosylation-site mutants, migration assays, in vivo neuroblastoma metastasis models","pmids":["18978946","24704826","23714211"],"confidence":"High","gaps":["alpha-actinin-independent suppressive mechanism not identified","How glycosylation contributes independent of alpha-actinin binding unknown"]},{"year":2007,"claim":"Glycan-specific recognition by DC-SIGN and sialylation-dependent loss of leukocyte support established that ICAM-2 glycoforms determine which partners it engages.","evidence":"Shear-flow adhesion assays, glycosylation manipulation, FUT1 siRNA, isoelectric focusing and neuraminidase treatment","pmids":["18155766","15673159"],"confidence":"Medium","gaps":["In vivo relevance of cell-type glycoform differences not tested","Single-lab biochemistry"]},{"year":2022,"claim":"Recent disease-model studies extended ICAM-2/PI3K/AKT signaling to pathological proliferation and metastasis, with m6A methylation identified as an upstream regulator of ICAM2 expression.","evidence":"MeRIP, ChIP, luciferase, knockdown/overexpression in RA-FLS and TNBC models; pull-down and antibody neutralization in vivo","pmids":["36536495","37620448"],"confidence":"Medium","gaps":["Generality of m6A regulation beyond RA-FLS untested","ICAM2-ICAM1 homophilic/heterophilic interaction in metastasis structurally undefined"]},{"year":null,"claim":"How outside-in ICAM-2 signaling selectively engages Rac and PI3K but not RhoA, and how ligand engagement, glycoform, and cytoskeletal coupling are integrated into a unified signaling mechanism, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No co-crystal of ICAM-2 with any integrin or DC-SIGN partner","Mechanism of selective GTPase activation unexplained","No human Mendelian disease association established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,2,24]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,7,8,29]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[8]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[10,12,13]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,7,8,14]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[6,7,8,29]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,17,19,20]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,12,13]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,21,22]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[12]}],"complexes":[],"partners":["ITGAL","ITGB2","ITGAM","EZR","MSN","ACTN1","CD209","ICAM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P13598","full_name":"Intercellular adhesion molecule 2","aliases":[],"length_aa":275,"mass_kda":30.7,"function":"Cell adhesion molecule that functions as a receptor ligand of the signaling receptor ITGAL:ITGB2/LFA-1 (lymphocyte-function associated (LFA) molecule 1) ensuring leukocyte cell-cell adhesion on resting cells (PubMed:10077629, PubMed:1676048, PubMed:2497351). Also endothelial blood vessels receptor ligand of dendritic cell (DC) CD209 signaling receptor that mediates triggering transendothelial migration of DC presursors from blood into peripheral tissues and, subsequently, into lymphoid tissues (PubMed:11017109). Mediates adhesive interactions important for antigen presentation, lymphocyte recirculation, and other cellular interactions important for immune response and surveillance (Probable)","subcellular_location":"Cell membrane; Cell projection, microvillus","url":"https://www.uniprot.org/uniprotkb/P13598/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ICAM2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ICAM2","total_profiled":1310},"omim":[{"mim_id":"614088","title":"INTRACELLULAR ADHESION MOLECULE 4; ICAM4","url":"https://www.omim.org/entry/614088"},{"mim_id":"603693","title":"ZINC FINGER PROTEIN, FOG FAMILY MEMBER 2; ZFPM2","url":"https://www.omim.org/entry/603693"},{"mim_id":"602731","title":"FYN-BINDING PROTEIN 1; FYB1","url":"https://www.omim.org/entry/602731"},{"mim_id":"602037","title":"RAS HOMOLOG GENE FAMILY, MEMBER H; RHOH","url":"https://www.omim.org/entry/602037"},{"mim_id":"600576","title":"GATA-BINDING PROTEIN 4; GATA4","url":"https://www.omim.org/entry/600576"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":156.5}],"url":"https://www.proteinatlas.org/search/ICAM2"},"hgnc":{"alias_symbol":["CD102"],"prev_symbol":[]},"alphafold":{"accession":"P13598","domains":[{"cath_id":"2.60.40.10","chopping":"28-107","consensus_level":"high","plddt":95.4393,"start":28,"end":107},{"cath_id":"2.60.40.10","chopping":"115-215","consensus_level":"high","plddt":93.168,"start":115,"end":215}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P13598","model_url":"https://alphafold.ebi.ac.uk/files/AF-P13598-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P13598-F1-predicted_aligned_error_v6.png","plddt_mean":87.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ICAM2","jax_strain_url":"https://www.jax.org/strain/search?query=ICAM2"},"sequence":{"accession":"P13598","fasta_url":"https://rest.uniprot.org/uniprotkb/P13598.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P13598/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P13598"}},"corpus_meta":[{"pmid":"2497351","id":"PMC_2497351","title":"Functional cloning of ICAM-2, a cell adhesion ligand for LFA-1 homologous to ICAM-1.","date":"1989","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/2497351","citation_count":855,"is_preprint":false},{"pmid":"9472040","id":"PMC_9472040","title":"Ezrin/radixin/moesin (ERM) proteins bind to a positively charged amino acid cluster in the juxta-membrane cytoplasmic domain of CD44, CD43, and ICAM-2.","date":"1998","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/9472040","citation_count":520,"is_preprint":false},{"pmid":"1676048","id":"PMC_1676048","title":"Characterization of ICAM-2 and evidence for a third counter-receptor for LFA-1.","date":"1991","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/1676048","citation_count":499,"is_preprint":false},{"pmid":"9705328","id":"PMC_9705328","title":"Association of ezrin with intercellular adhesion molecule-1 and -2 (ICAM-1 and ICAM-2). 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ICAM-2 is an integral membrane protein with two immunoglobulin-like domains, closely related to the two N-terminal domains of ICAM-1 (34% identity), and mediates LFA-1-dependent cell adhesion.\",\n      \"method\": \"Functional cloning using a novel ligand-identification method; COS cell transfection and cell adhesion assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — original functional cloning with cell adhesion assays, widely replicated across subsequent studies\",\n      \"pmids\": [\"2497351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"A blocking anti-ICAM-2 monoclonal antibody (CBR-IC2/2) totally inhibited binding of ICAM-2+ COS cells to purified LFA-1, confirming ICAM-2 as a direct LFA-1 ligand. ICAM-1 and ICAM-2 together account for all LFA-1-dependent binding to endothelium, but an additional LFA-1 ligand (ICAM-3) was implicated on some cell lines.\",\n      \"method\": \"Monoclonal antibody generation, immunoprecipitation, cell binding assays to purified LFA-1, mAb blocking experiments\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal blocking mAb and cell binding to purified protein, replicated across multiple cell types\",\n      \"pmids\": [\"1676048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"ICAM-2 (CD102) binds to the leukocyte integrin CD11b/CD18 (Mac-1) through the CD11b A domain. A 22-amino acid peptide (P1) derived from the first Ig domain of ICAM-2 also binds to purified CD11b/CD18.\",\n      \"method\": \"Cell adhesion assays with purified integrins, peptide competition, blocking with anti-CD11b A domain antibodies\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding to purified protein, domain-mapping with blocking antibodies, single lab\",\n      \"pmids\": [\"7561061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"A synthetic peptide from ICAM-2 spanning residues 21-42 of the first immunoglobulin domain binds to purified CD11a/CD18 (LFA-1) and inhibits adhesion of endothelial cells to this integrin and B lymphoblastoid cell binding to endothelium.\",\n      \"method\": \"Peptide synthesis, binding assay to purified CD11a/CD18, cell adhesion inhibition assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified integrin and synthetic peptide, single lab\",\n      \"pmids\": [\"8349630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Crystal structure of the extracellular region of ICAM-2 was determined. Glu-37 is critical for LFA-1 binding and is proposed to coordinate the Mg2+ ion in the LFA-1 I domain. The LFA-1 recognition surface is relatively flat and the critical Glu lies in a beta-strand (unlike VCAM-1/fibronectin where critical Asp is in a loop). A bend between domains 1 and 2 and N-linked glycans in domain 2 present the recognition surface to LFA-1.\",\n      \"method\": \"X-ray crystallography of extracellular ICAM-2\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure determination, structurally validated binding site\",\n      \"pmids\": [\"9153399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Mutagenesis of ICAM-2 based on its crystal structure localized the LFA-1 binding site to a diagonal band across the GFC beta-sheet and CD edge of domain 1, with Glu-37 ligating Mg2+ in the I domain. The binding site is confined to the upper part of domain 1, distinct from the VCAM-1 binding site for alpha4 integrins.\",\n      \"method\": \"Site-directed mutagenesis of ICAM-2 guided by crystal structure; LFA-1 binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure-guided mutagenesis with functional binding assays, validated by structural comparison\",\n      \"pmids\": [\"10077629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ICAM-2 cytoplasmic domain (amino acids 231-254) binds alpha-actinin. The minimal binding region was mapped to ICAM-2 residues 241-248. Colocalization of ICAM-2 and alpha-actinin was demonstrated in Eahy926 cells, suggesting alpha-actinin links ICAM-2 to the actin cytoskeleton.\",\n      \"method\": \"Affinity peptide pulldown from placental lysates, immunoblotting with anti-alpha-actinin, confocal microscopy colocalization, bacterially expressed alpha-actinin fusion proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity pulldown with domain mapping, colocalization, and binding to purified recombinant protein, single lab\",\n      \"pmids\": [\"8824270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ERM proteins (ezrin/radixin/moesin) bind to a positively charged amino acid cluster in the juxtamembrane cytoplasmic domain of ICAM-2. GST-fusion of ICAM-2 cytoplasmic domain bound moesin in vitro. E-cadherin chimeras bearing the ICAM-2 cytoplasmic sequence co-concentrated with ERM proteins at microvilli; deletion of the positively charged cluster abolished this. Binding was confirmed by co-immunoprecipitation and site-directed mutagenesis.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, site-directed mutagenesis, chimeric protein expression in L fibroblasts, confocal microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (pulldown, co-IP, mutagenesis, chimera localization), replicated by independent group (PMID:9705328)\",\n      \"pmids\": [\"9472040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Ezrin interacts directly with ICAM-2 cytoplasmic tail. The interaction was demonstrated by affinity precipitation, microtiter binding assay, co-immunoprecipitation, and surface plasmon resonance (KD = 3.3 × 10^-7 M). PtdIns(4,5)P2 enhanced the ICAM-2-ezrin interaction, and ICAM-2 cytoplasmic tail directly binds PtdIns(4,5)P2. ICAM-2 and ezrin co-localize in microvillar projections of transfected cells.\",\n      \"method\": \"Affinity precipitation, microtiter binding assay, co-immunoprecipitation, surface plasmon resonance, cell transfection with localization analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal binding methods including SPR with KD determination, phosphoinositide binding assay, confirmed by independent lab\",\n      \"pmids\": [\"9705328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"NK cell-mediated killing depends on ICAM-2 and is regulated by ICAM-2 distribution. In NK-sensitive cells, ICAM-2 is concentrated in uropod-like projections with ezrin. Transfection of ezrin into NK-resistant cells induced uropod formation, redistribution of ICAM-2, and sensitized cells to IL-2-activated killing.\",\n      \"method\": \"Ezrin transfection into NK-resistant cells, NK cytotoxicity assays, confocal microscopy of ICAM-2 and ezrin localization\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional transfection experiment with mechanistic readout (NK killing + ICAM-2 redistribution), published in high-tier journal\",\n      \"pmids\": [\"8717043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ICAM-2 activates the PI3K/AKT pathway. ICAM-2 induced tyrosine phosphorylation of ezrin and PI3K membrane translocation, resulting in PIP3 production, PDK-1 and AKT activation, and phosphorylation of AKT targets BAD, GSK3, and FKHR. ICAM-2 clustering protected primary human CD19+ cells from TNFα- and Fas-mediated apoptosis. ICAM-2 engagement by its natural receptor LFA-1 on CD4+ T cells specifically induced AKT activity.\",\n      \"method\": \"Genetic screen for PI3K/AKT activators, biochemical assays for ezrin phosphorylation/PI3K translocation/PIP3/PDK-1/AKT activation, apoptosis assays, single-cell analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic screen followed by multiple orthogonal biochemical assays and functional apoptosis readout, published in high-tier journal\",\n      \"pmids\": [\"11825565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ICAM-1 cross-linking activates RhoA and induces stress fiber formation and c-fos/rhoA transcription in endothelial cells. In contrast, ICAM-2 cross-linking does NOT activate RhoA or alter actin cytoskeletal organization in HUVECs, despite both ICAM-1 and ICAM-2 localizing with moesin in apical microvilli at baseline.\",\n      \"method\": \"ICAM cross-linking with antibodies, RhoA activity assay, actin staining, transcription reporter assays, confocal microscopy\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional comparison of ICAM-1 and ICAM-2 with RhoA activity assays and cytoskeletal readouts, negative result for ICAM-2 RhoA activation rigorously established\",\n      \"pmids\": [\"12097408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Endothelial ICAM-2 regulates angiogenesis. ICAM-2-deficient mice and ICAM-2-deficient endothelial cells show impaired angiogenesis in vitro and in vivo. ICAM-2 supports homophilic interaction (involved in tube formation), supports cell migration, protects against apoptosis (serum deprivation, anti-Fas, staurosporine), and activates the small GTPase Rac, which is required for tube formation and migration.\",\n      \"method\": \"ICAM-2 knockout mice, ICAM-2-deficient endothelial cells, in vitro tube formation assay, in vivo angiogenesis assay, cell migration assay, apoptosis assays, Rac GTPase activity assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mice + deficient cells + multiple orthogonal functional assays including Rac activation, in vitro and in vivo evidence\",\n      \"pmids\": [\"15920013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ICAM-2 regulates endothelial barrier function and vascular permeability through a pathway involving N-cadherin, ERM proteins, and Rac-1 signaling. ICAM-2 lacking ERM-binding site or cytoplasmic tail failed to restore junctions and Rac-1 activation in ICAM-2-deficient cells. In vivo, thrombin-induced vascular permeability was increased in ICAM-2-deficient mice.\",\n      \"method\": \"siRNA knockdown, ICAM-2 knockout endothelioma lines, re-expression of full-length vs. mutant ICAM-2, transendothelial electrical resistance, intravital fluorescence microscopy for permeability, Rac-1 activity assay\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout cells + in vivo permeability + domain mutants identifying ERM-binding and cytoplasmic tail as required for Rac-1 activation and junction formation\",\n      \"pmids\": [\"24593809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"TNF-α and IL-1β down-regulate ICAM-2 expression at the transcriptional level in HUVECs (to ~50% of control surface expression; mRNA reduced to ~40% of control). Inflammatory cytokines reduce ICAM-2 promoter activity. ICAM-2 localizes mainly at endothelial cell junctions and this junctional expression is markedly decreased by cytokine treatment. IFN-γ had no effect on ICAM-2 expression.\",\n      \"method\": \"Flow cytometry, Northern blotting, ICAM-2 promoter reporter assays in HUVECs, immunocytochemistry\",\n      \"journal\": \"Cell adhesion and communication\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter + mRNA + surface protein assays, single lab, multiple methods\",\n      \"pmids\": [\"10223354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TNF-α-mediated down-regulation of the ICAM-2 promoter involves three Ets transcription factor binding sites (EBS). Two of these EBS are involved in TNF-α-induced down-regulation. The Ets family member Erg is constitutively expressed in HUVECs, binds the EBS, and transactivates the ICAM-2 promoter. TNF-α down-regulates Erg protein levels, and ICAM-2 and Erg expression are co-regulated in an ex vivo artery model.\",\n      \"method\": \"Site-directed mutagenesis of ICAM-2 promoter, EMSA, Erg cDNA transactivation assays in HeLa and HUVEC, Western blotting for Erg protein, ex vivo artery model\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis + EMSA + transactivation assays, single lab, multiple methods\",\n      \"pmids\": [\"10574717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ICAM-2 promoter activity in endothelial cells requires Sp1 motif at -194 and GATA motifs at -145 and -53 (each contributing 61-78% of activity). Mutation of an 8-bp palindrome at -268 also reduced activity by 70%. Specific binding of endothelial nuclear proteins to these sites was demonstrated. GATA-2 overexpression transactivated the ICAM-2 promoter 3-4-fold in COS cells.\",\n      \"method\": \"Promoter reporter gene assays, site-directed mutagenesis, gel shift (EMSA) analysis, GATA-2 transactivation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis + EMSA + transactivation assays, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"9565596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ICAM-1 and ICAM-2 (but not PECAM-1, VCAM-1, or E-selectin) are essential for transendothelial migration of T cells. In the absence of ICAM-1, only ICAM-2 mediates transendothelial migration. This was established using ICAM-1-deficient endothelioma cells and rescue by retroviral transfer of wild-type ICAM-1.\",\n      \"method\": \"ICAM-1-deficient endothelioma cells from knockout mice, retroviral rescue with wild-type ICAM-1, transendothelial migration assay, blocking antibodies\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout cells + retroviral rescue + mAb blocking, replicated in subsequent studies\",\n      \"pmids\": [\"9808177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Endothelial ICAM-1 and ICAM-2 are equally required for transendothelial migration of thymocytes and T lymphoma cells, in addition to CD4+ memory T cells, demonstrating that this requirement is not T cell subset-specific.\",\n      \"method\": \"ICAM-1-deficient endothelioma cells, transendothelial migration assay with different T cell populations\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout endothelial cells, multiple T cell populations, single lab\",\n      \"pmids\": [\"10464174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ICAM-2-deficient mice exhibit prolonged accumulation of eosinophils in lung interstitium and delayed eosinophil transmigration into the airway lumen during allergic lung inflammation, resulting in prolonged heightened airway hyperresponsiveness. This phenotype is due to lack of ICAM-2 on non-hematopoietic (endothelial) cells; ICAM-2 deficiency on endothelial cells reduces eosinophil transmigration in vitro. ICAM-2 is not essential for lymphocyte homing but is required for megakaryocyte progenitor numbers.\",\n      \"method\": \"ICAM-2 knockout mice, allergic lung disease model, in vitro eosinophil transmigration assay, bone marrow analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ICAM-2 knockout mice with in vivo inflammatory model + in vitro transmigration assay + cell-specific reconstitution evidence\",\n      \"pmids\": [\"10023766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ICAM-2, JAM-A, and PECAM-1 act sequentially to mediate neutrophil transmigration in response to IL-1β but not TNF-α stimulation. When TNF-α direct stimulation of neutrophils is blocked, TNF-α-induced neutrophil transmigration becomes dependent on these molecules. Analysis of neutrophil arrest sites in ICAM-2-/-, JAM-A-/-, and PECAM-1-/- mice showed sequential roles.\",\n      \"method\": \"ICAM-2-/-, JAM-A-/-, PECAM-1-/- mice, cell-transfer technique, fluorescence intravital microscopy of cremaster venules\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple knockout mouse strains + intravital microscopy + cell transfer technique establishing sequential pathway\",\n      \"pmids\": [\"19211506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Endothelial ICAM-2 (but not VCAM-1) mediates T cell polarization and crawling on BBB endothelium. T cell arrest is mediated by ICAM-1 and VCAM-1, while T cell polarization and crawling require ICAM-1 and ICAM-2. This dissects sequential roles: arrest (ICAM-1/VCAM-1) then crawling (ICAM-1/ICAM-2) prior to diapedesis.\",\n      \"method\": \"Wild-type, ICAM-1-/-, ICAM-2-/-, and ICAM-1/ICAM-2 double-deficient primary mouse brain microvascular endothelial cells; live cell imaging under physiological flow conditions\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple knockout endothelial cell lines + live imaging under flow, dissecting distinct functional steps\",\n      \"pmids\": [\"20861356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"β2 integrin-mediated neutrophil crawling on endothelial ICAM-1 and ICAM-2 is a prerequisite for transcellular neutrophil diapedesis across the inflamed BBB. In the absence of crawling, neutrophils undergo only paracellular diapedesis. Crawling is mediated by endothelial ICAM-1 and ICAM-2 and neutrophil LFA-1 and Mac-1.\",\n      \"method\": \"Wild-type, CD11a-/-, CD11b-/-, CD18-null neutrophils with wild-type, JAM-A-/-, ICAM-1-null, ICAM-2-/-, ICAM-1/ICAM-2-double-null endothelial cells; live-cell imaging under physiological flow\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — comprehensive genetic dissection with multiple knockout combinations + live imaging, establishing mechanistic prerequisite relationship\",\n      \"pmids\": [\"24259506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ICAM-2 has functional roles in luminal neutrophil crawling in vivo: blockade of ICAM-2 reduced crawling velocity, increased stop-start crawling profile, prolonged neutrophil interaction at EC junctions prior to TEM, and reduced overall extravasation. Some ICAM-2-dependent functions are mediated through Mac-1 ligation.\",\n      \"method\": \"Real-time in vivo confocal microscopy of neutrophil-vessel interactions; functional and genetic ICAM-2 blockade; Mac-1 pharmacological inhibition\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — real-time in vivo intravital confocal microscopy with both functional and genetic blockade\",\n      \"pmids\": [\"24317296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DC-SIGN on dendritic cells binds to the Lewis Y (LeY) glycan epitope on ICAM-2 on endothelial cells to mediate DC rolling and adhesion on endothelium under shear flow. The interaction is strictly glycan-specific; ICAM-2 on CHO cells serves as a DC-SIGN ligand only when properly glycosylated. FUT1 directs LeY expression; FUT1 silencing reduces DC rolling/adhesion.\",\n      \"method\": \"DC-SIGN/ICAM-2 adhesion assays under shear flow, CHO cell transfection with ICAM-2 ± glycosylation, FUT1 siRNA knockdown, antibody blocking\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional adhesion assays under flow + glycosylation manipulation + siRNA knockdown, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"18155766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Sialylation of platelet ICAM-2 impairs its ability to support leukocyte adhesion. Platelet ICAM-2 is more acidic than endothelial ICAM-2 due to cell-specific N-linked glycosylation (sialylation). Platelet ICAM-2 supports 50% less T cell adhesion via LFA-1 and no DC adhesion via DC-SIGN compared to endothelial ICAM-2. Neuraminidase treatment abolished these differences.\",\n      \"method\": \"Isoelectric focusing, N-glycanase/neuraminidase treatment, purified protein adhesion assays, T cell and DC adhesion to immobilized ICAM-2\",\n      \"journal\": \"Inflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical characterization of glycoforms + functional adhesion assays with enzymatic manipulation, single lab\",\n      \"pmids\": [\"15673159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Crystals of the complex between the radixin FERM domain and the full-length 28-residue cytoplasmic tail of ICAM-2 were obtained, with data collected to 2.60 Å resolution, establishing the structural basis for ERM-ICAM-2 interaction.\",\n      \"method\": \"X-ray crystallography of radixin FERM domain / ICAM-2 cytoplasmic tail complex\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure reported but only crystallographic characterization abstract, full functional validation not described in this paper\",\n      \"pmids\": [\"11375520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Soluble ICAM-2Fc and a peptide from the first Ig domain of ICAM-2 (P1) can activate integrin affinity in T lymphocytes, inducing CD11/CD18-dependent adhesion to immobilized ICAMs. The activation is energy-, divalent cation-, temperature-, and cytoskeleton-dependent. ICAM-2Fc is a more potent activator of integrin affinity than ICAM-1Fc or ICAM-3Fc.\",\n      \"method\": \"T lymphocyte adhesion assays to purified ICAMs, soluble ICAM-Fc binding assays, cytoskeletal inhibitors, kinase inhibitors\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vitro assays with purified proteins and inhibitor dissection, single lab\",\n      \"pmids\": [\"10352278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"An ICAM-2 peptide (residues 21-42) activates NK cell migration (up to 215% of control), induces F-actin polymerization at the leading edge, increases phosphorylation of 150- and 35-kDa proteins, and this migration activation is inhibited by anti-CD11a monoclonal antibodies. This effect is mediated through CD11a/CD18 ligation without receptor recycling.\",\n      \"method\": \"Boyden chamber migration assay, F-actin staining, phosphotyrosine immunoblotting, anti-CD11a blocking antibodies, receptor recycling assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional peptide stimulation assays with signaling readouts and antibody blocking, single lab\",\n      \"pmids\": [\"7721764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ICAM-2 forms a complex with alpha-actinin and actin in neuroblastoma cells, linking the membrane to the actin cytoskeleton. ICAM-2 expression limited cell motility, redistributed actin fibers in vitro, and suppressed disseminated tumor formation in vivo in a metastatic neuroblastoma model.\",\n      \"method\": \"Co-immunoprecipitation, competitive peptide assays, in vitro cell migration assay, actin fiber staining, in vivo metastasis model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP + competitive peptide + in vitro and in vivo functional assays demonstrating complete membrane-linker-actin linkage with phenotypic consequence\",\n      \"pmids\": [\"18978946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The interaction of ICAM-2 with alpha-actinin through its cytoplasmic domain is required for ICAM-2 to confer a non-metastatic phenotype in neuroblastoma cells in vivo. ICAM-2 variants with mutated alpha-actinin-binding domains inhibited cell adhesion, migration, and colony growth in vitro similarly to WT, but unlike WT failed to completely suppress disseminated tumor development in vivo. Both alpha-actinin-dependent and alpha-actinin-independent mechanisms contribute to ICAM-2 function.\",\n      \"method\": \"In silico domain analysis, site-directed mutagenesis of alpha-actinin-binding domain, co-precipitation assays, cell migration and adhesion assays, in vivo metastasis model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mutagenesis of specific binding domain + co-precipitation + in vitro and in vivo functional assays, mechanistically dissecting alpha-actinin-dependent vs independent effects\",\n      \"pmids\": [\"24704826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"N-glycosylation of ICAM-2 is required for complete suppression of metastatic potential in neuroblastoma cells. Hypo- or non-glycosylated ICAM-2 variants (alanine substitutions at N47, N82, N105, N153, N178, N187) significantly attenuated but did not abolish ICAM-2's ability to suppress metastatic properties. Glycosylation status did not affect ICAM-2 interaction with alpha-actinin.\",\n      \"method\": \"Site-directed mutagenesis of N-linked glycosylation sites, cell migration assay, anchorage-independent growth, F-actin distribution, co-immunoprecipitation with alpha-actinin, in vivo metastasis model\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic site-directed mutagenesis + in vitro and in vivo functional assays, single lab\",\n      \"pmids\": [\"23714211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ICAM2 promotes RA-FLS proliferation, migration, and invasion via the ICAM2/PI3K/AKT/p300 pathway. ATT inhibits METTL3-mediated N6-methyladenosine (m6A) methylation of ICAM2 mRNA in RA-FLSs, thereby suppressing ICAM2 expression and downstream signaling. p300 directly facilitates METTL3 transcription, forming a feedback loop with ICAM2.\",\n      \"method\": \"RNA-seq, siRNA knockdown, plasmid overexpression, methylated RNA immunoprecipitation (MeRIP), chromatin immunoprecipitation (ChIP), luciferase reporter, cell proliferation/migration/invasion assays, CIA mouse model\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (MeRIP, ChIP, luciferase, KD/OE) in single lab establishing m6A regulation of ICAM2 mRNA and downstream pathway\",\n      \"pmids\": [\"36536495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ICAM2 promotes leptomeningeal metastasis of TNBC by mediating adhesion to and trans-BCB migration across the blood-CSF barrier via homophilic or heterophilic interaction with ICAM1 in choroid plexus epithelial cells. ICAM2 also conferred cancer stem cell properties. Neutralizing ICAM2 attenuated LM progression in vivo.\",\n      \"method\": \"Proteomic analysis, pull-down assay, antibody neutralization, in vitro trans-BCB migration assay, in vivo spinal cord colonization model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pull-down + antibody blocking + in vitro and in vivo migration assays, single lab\",\n      \"pmids\": [\"37620448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Epithelial ICAM-2 (but not ICAM-3) is expressed on bronchial epithelium and together with ICAM-1 mediates T cell egression across the bronchial epithelium via LFA-1. Blocking both ICAM-1 and ICAM-2 inhibited egression by ~70%, and LFA-1/ICAM interactions on the basolateral epithelium enable recognition of interepithelial junctions but not adhesion/polarization per se.\",\n      \"method\": \"In vitro trans-epithelial migration assay, blocking antibodies against ICAM-1, ICAM-2, ICAM-3, LFA-1; step analysis of adhesion, polarization, and diapedesis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — blocking antibody functional dissection with step-specific readouts, single lab\",\n      \"pmids\": [\"18842965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LFA-1/ICAM-1 or LFA-1/ICAM-2 interactions deliver a negative regulatory signal for Th2 cytokine production. Blocking LFA-1/ICAM-1 or LFA-1/ICAM-2 interactions increased Th2 cytokines (IL-4, IL-5) 15- to 40-fold; combined blockade of both led to 100- to 1,000-fold increase, demonstrating synergistic Th2-suppressive roles.\",\n      \"method\": \"T cells from DO11.10 TCR transgenic mice stimulated by dendritic cells; blocking monoclonal antibodies to LFA-1, ICAM-1, ICAM-2; cytokine ELISAs\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — blocking antibody functional dissection with cytokine readout, defined cellular system, single lab\",\n      \"pmids\": [\"9820482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ICAM-2 provides a costimulatory signal for T cell stimulation by allogeneic class II MHC in an LFA-1-dependent manner. ICAM-2 transfection on MHC II-expressing L cells enhanced T cell proliferation similarly to ICAM-1. ICAM-2-stimulated T cells mounted a secondary allogeneic response, whereas T cells stimulated without ICAM-1/-2 did not, suggesting ICAM-2 prevents anergy.\",\n      \"method\": \"ICAM-2 transfection into MHC II+ L cells, mixed lymphocyte reaction, thymidine incorporation, secondary stimulation assays\",\n      \"journal\": \"Scandinavian journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transfection-based functional assay with primary and secondary response readouts, single lab\",\n      \"pmids\": [\"9122613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ICAM-2 (Icam2) is expressed on hemogenic endothelium during embryonic hematopoiesis and marks the transition from hemangioblast to hemogenic endothelium. Its expression persists on fetal liver hematopoietic progenitors. Sequential CD40 then Icam2 expression defines progressive steps in blood specification from mesoderm.\",\n      \"method\": \"Embryonic stem cell differentiation in serum-free culture, in vitro and in vivo lineage analysis, cell surface marker characterization, hematopoietic progenitor assays\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional stem cell differentiation assays with in vitro and in vivo validation defining surface marker role in lineage specification\",\n      \"pmids\": [\"20506544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Downregulation of ICAM2 by siRNA enhanced radiosensitivity of OSCC cells with increased apoptosis via AKT phosphorylation (Ser473) and caspase-3 activation. Overexpression of ICAM2 conferred resistance to X-ray irradiation, suggesting ICAM2 promotes cell survival through AKT signaling.\",\n      \"method\": \"siRNA knockdown, ICAM2 overexpression, X-ray irradiation, apoptosis assays, Western blot for phospho-AKT and caspase-3\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (KD and OE) with AKT/caspase signaling readouts, single lab\",\n      \"pmids\": [\"18349842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"ICAM-2 peptide 2 (residues spanning a specific region) mediates lymphocyte adhesion through both CD11/CD18 (β2 integrin) and CD49d/CD29 (VLA-4) integrins. Blocking both anti-CD18 and anti-CD29 antibodies together caused near-complete inhibition of cell attachment to the peptide.\",\n      \"method\": \"Synthetic ICAM-2 peptides, cell attachment assays, blocking monoclonal antibodies to CD11/CD18 and CD49d/CD29\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single blocking antibody approach with synthetic peptide, single lab, not confirmed by direct binding to purified VLA-4\",\n      \"pmids\": [\"1709118\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ICAM-2 (CD102) is a two-Ig-domain transmembrane glycoprotein that functions as a constitutively expressed ligand for LFA-1 (CD11a/CD18) and Mac-1 (CD11b/CD18) integrins (with Glu-37 in domain 1 coordinating Mg2+ in the integrin I domain as revealed by crystal structure), and for DC-SIGN via Lewis Y glycans; its short cytoplasmic tail links to the actin cytoskeleton through direct binding to ERM proteins (via a juxtamembrane positively charged cluster regulated by PtdIns(4,5)P2) and to alpha-actinin; outside-in signaling through ICAM-2 activates the PI3K/AKT pathway (via ezrin tyrosine phosphorylation) to inhibit apoptosis, and activates Rac to support endothelial migration, tube formation, and vascular barrier function, while notably failing to activate RhoA (in contrast to ICAM-1); at the tissue level, ICAM-2 mediates leukocyte crawling and sequential steps of transmigration across vascular and epithelial barriers, regulates angiogenesis, eosinophil trafficking, and NK cell recognition of redistributed ICAM-2 in uropods, and in tumor cells interacts with alpha-actinin to suppress the metastatic phenotype.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ICAM-2 (CD102) is a constitutively expressed two-Ig-domain transmembrane adhesion glycoprotein that serves as a counter-receptor for leukocyte β2 integrins and thereby governs leukocyte trafficking, vascular biology, and immune cell signaling [#0, #2]. It was originally identified as a second ligand for LFA-1 (CD11a/CD18), structurally related to the N-terminal domains of ICAM-1 [#0, #1], and also binds Mac-1 (CD11b/CD18) through its first Ig domain [#2]. Crystallographic and structure-guided mutagenesis studies localized the integrin recognition surface to a flat band across domain 1, with Glu-37 coordinating the Mg2+ ion in the LFA-1 I domain [#4, #5]. Its glycosylation state tunes ligand activity: properly glycosylated ICAM-2 bearing Lewis Y presents a glycan-specific ligand for DC-SIGN, while cell-type-specific sialylation reduces its capacity to support leukocyte adhesion [#24, #25]. The short cytoplasmic tail couples ICAM-2 to the actin cytoskeleton through direct, PtdIns(4,5)P2-regulated binding of ERM proteins (ezrin/moesin) at a juxtamembrane positively charged cluster and through binding to alpha-actinin [#7, #8, #6]. Outside-in signaling through ICAM-2 drives ezrin tyrosine phosphorylation, PI3K membrane recruitment, and AKT activation to suppress apoptosis, and activates Rac—but not RhoA—to support endothelial migration, tube formation, and vascular barrier integrity [#10, #11, #12, #13]. At the tissue level ICAM-2 mediates leukocyte crawling and sequential transmigration steps across vascular and epithelial barriers, regulates angiogenesis and eosinophil trafficking, and contributes to NK recognition and T cell costimulation [#19, #21, #22, #34, #9]. In tumor cells, the ICAM-2–alpha-actinin–actin linkage suppresses the metastatic phenotype [#29, #30]. ICAM-2 promoter activity is endothelially programmed by Sp1, GATA, and Ets factors and is down-regulated by inflammatory cytokines [#15, #16, #14]. No Mendelian disease link is established in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Establishing that LFA-1 has a second cellular ligand answered why LFA-1-dependent adhesion persisted in settings of limited ICAM-1, defining ICAM-2 as a distinct adhesion receptor.\",\n      \"evidence\": \"Functional cloning, COS cell transfection and cell adhesion assays\",\n      \"pmids\": [\"2497351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map the integrin-binding residues\", \"Cellular and tissue distribution not yet defined\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Reciprocal blocking and binding to purified LFA-1 confirmed ICAM-2 as a direct, not indirect, LFA-1 ligand and placed it alongside ICAM-1 as accounting for LFA-1 binding to endothelium.\",\n      \"evidence\": \"Blocking mAb (CBR-IC2/2), immunoprecipitation, cell binding to purified LFA-1\",\n      \"pmids\": [\"1676048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"An additional LFA-1 ligand on some lines remained unaccounted for\", \"Affinity and structural basis of binding undefined\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Mapping ICAM-2 binding to the CD11b A domain broadened its receptor repertoire beyond LFA-1 to include Mac-1, relevant for myeloid adhesion.\",\n      \"evidence\": \"Adhesion assays with purified integrins, peptide competition, anti-CD11b A-domain blocking\",\n      \"pmids\": [\"7561061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative physiological contribution of Mac-1 vs LFA-1 binding not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The crystal structure defined the molecular architecture of the integrin recognition surface, showing Glu-37 positioned to coordinate the I-domain Mg2+ and distinguishing ICAM-2's binding mode from VCAM-1/fibronectin.\",\n      \"evidence\": \"X-ray crystallography of extracellular ICAM-2; structure-guided mutagenesis with LFA-1 binding assays\",\n      \"pmids\": [\"9153399\", \"10077629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal of the ICAM-2/LFA-1 complex\", \"Conformational changes upon binding not captured\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying ERM and alpha-actinin binding to the cytoplasmic tail explained how ICAM-2 physically anchors to the cortical actin cytoskeleton and localizes to microvilli.\",\n      \"evidence\": \"GST pulldown, co-IP, SPR (KD = 3.3×10^-7 M), PtdIns(4,5)P2 binding, mutagenesis, chimera localization; alpha-actinin affinity pulldown and colocalization\",\n      \"pmids\": [\"9472040\", \"9705328\", \"8824270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of cytoskeletal coupling not yet defined\", \"Crystallographic detail of the FERM-tail interaction came later (PMID 11375520)\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Linking ICAM-2 redistribution into ezrin-rich uropods to NK killing connected the cytoskeletal anchorage to an immune effector function.\",\n      \"evidence\": \"Ezrin transfection into NK-resistant cells, cytotoxicity assays, confocal localization\",\n      \"pmids\": [\"8717043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling from redistributed ICAM-2 not defined\", \"NK receptor engaging ICAM-2 not identified here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that ICAM-2 engagement activates PI3K/AKT and that it fails to activate RhoA established outside-in signaling distinct from ICAM-1 and a pro-survival role.\",\n      \"evidence\": \"Genetic screen, ezrin phosphorylation/PIP3/PDK-1/AKT biochemistry, apoptosis assays; ICAM cross-linking with RhoA activity and actin readouts\",\n      \"pmids\": [\"11825565\", \"12097408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between ezrin phosphorylation and PI3K recruitment not fully resolved\", \"Why ICAM-2 cannot activate RhoA mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Knockout mice and deficient endothelial cells showed ICAM-2 drives Rac-dependent angiogenesis, migration, tube formation, and survival, defining an endothelial-autonomous role beyond leukocyte adhesion.\",\n      \"evidence\": \"ICAM-2 knockout mice and cells, tube formation, in vivo angiogenesis, migration, apoptosis, Rac activity assays\",\n      \"pmids\": [\"15920013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The homophilic interaction inferred for tube formation not structurally characterized\", \"Upstream activator of Rac downstream of ICAM-2 unspecified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Domain-mutant rescue established that the ERM-binding site and cytoplasmic tail are required for ICAM-2 to maintain endothelial junctions and barrier function via N-cadherin and Rac-1.\",\n      \"evidence\": \"Knockout endothelioma lines, full-length vs mutant re-expression, TEER, intravital permeability, Rac-1 assay\",\n      \"pmids\": [\"24593809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking ICAM-2 tail to N-cadherin not detailed\", \"Whether ligand engagement is required for barrier function unclear\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Cytokine-driven transcriptional control via Ets/Erg, Sp1, and GATA sites explained how endothelial ICAM-2 levels are programmed and reduced during inflammation, opposite to ICAM-1.\",\n      \"evidence\": \"Promoter reporter assays, EMSA, site-directed mutagenesis, GATA-2/Erg transactivation, Northern blot, flow cytometry\",\n      \"pmids\": [\"10223354\", \"10574717\", \"9565596\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab promoter studies\", \"In vivo relevance of each transcription factor not tested genetically\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Knockout and rescue work established that endothelial ICAM-2, redundantly with ICAM-1, is required for transendothelial migration and physiological eosinophil/leukocyte trafficking.\",\n      \"evidence\": \"ICAM-1-deficient endothelioma + retroviral rescue; ICAM-2 knockout mice in allergic lung model and transmigration assays\",\n      \"pmids\": [\"9808177\", \"10464174\", \"10023766\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular signaling driving the migration step not dissected here\", \"Relative ICAM-1/ICAM-2 contribution varies by stimulus\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Multi-knockout intravital and flow imaging dissected ICAM-2's sequential roles in leukocyte crawling, defining crawling as a prerequisite for transcellular diapedesis distinct from the arrest step.\",\n      \"evidence\": \"Knockout mouse strains and endothelial cell combinations, cell transfer, intravital and flow live imaging\",\n      \"pmids\": [\"19211506\", \"20861356\", \"24259506\", \"24317296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling events coordinating crawling-to-diapedesis transition incomplete\", \"Stimulus-specificity (IL-1β vs TNF-α) mechanism unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining the ICAM-2–alpha-actinin–actin complex and N-glycosylation requirement showed ICAM-2 acts as a metastasis suppressor through cytoskeletal coupling.\",\n      \"evidence\": \"Co-IP, competitive peptides, alpha-actinin-binding and glycosylation-site mutants, migration assays, in vivo neuroblastoma metastasis models\",\n      \"pmids\": [\"18978946\", \"24704826\", \"23714211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"alpha-actinin-independent suppressive mechanism not identified\", \"How glycosylation contributes independent of alpha-actinin binding unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Glycan-specific recognition by DC-SIGN and sialylation-dependent loss of leukocyte support established that ICAM-2 glycoforms determine which partners it engages.\",\n      \"evidence\": \"Shear-flow adhesion assays, glycosylation manipulation, FUT1 siRNA, isoelectric focusing and neuraminidase treatment\",\n      \"pmids\": [\"18155766\", \"15673159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of cell-type glycoform differences not tested\", \"Single-lab biochemistry\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Recent disease-model studies extended ICAM-2/PI3K/AKT signaling to pathological proliferation and metastasis, with m6A methylation identified as an upstream regulator of ICAM2 expression.\",\n      \"evidence\": \"MeRIP, ChIP, luciferase, knockdown/overexpression in RA-FLS and TNBC models; pull-down and antibody neutralization in vivo\",\n      \"pmids\": [\"36536495\", \"37620448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of m6A regulation beyond RA-FLS untested\", \"ICAM2-ICAM1 homophilic/heterophilic interaction in metastasis structurally undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How outside-in ICAM-2 signaling selectively engages Rac and PI3K but not RhoA, and how ligand engagement, glycoform, and cytoskeletal coupling are integrated into a unified signaling mechanism, remains unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No co-crystal of ICAM-2 with any integrin or DC-SIGN partner\", \"Mechanism of selective GTPase activation unexplained\", \"No human Mendelian disease association established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 2, 24]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 7, 8, 29]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [10, 12, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 7, 8, 14]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [6, 7, 8, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 17, 19, 20]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 12, 13]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 21, 22]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ITGAL\", \"ITGB2\", \"ITGAM\", \"EZR\", \"MSN\", \"ACTN1\", \"CD209\", \"ICAM1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"ICAM2","tier":"IDENTITY","verdict":"Identity concern","subtype":"corpus_ungrounded","uniprot_band":"medium","rules_fired":"R1","issue":"R1: gene named in 18/87 (21%) of its own corpus abstracts (< 25%) — corpus likely a paralog/alias collision"},"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}