{"gene":"CD74","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2006,"finding":"Cell-surface CD74 stimulation with anti-CD74 antibody triggers a signaling cascade leading to NF-κB (p65/RelA) activation, entry into S phase, DNA synthesis, cell division, and upregulation of BCL-XL, establishing CD74 as a survival receptor on B cells.","method":"Anti-CD74 antibody stimulation of B cells; NF-κB reporter assays; BrdU incorporation; flow cytometry for cell cycle; Western blot for BCL-XL","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean functional antibody stimulation with multiple orthogonal readouts (cell cycle, DNA synthesis, NF-κB, survival gene expression) in a single lab","pmids":["16484589"],"is_preprint":false},{"year":2007,"finding":"CD74 activation by MIF/anti-CD74 induces NF-κB p65, which upregulates TAp63 expression; TAp63 then binds and transactivates the BCL-2 gene promoter, increasing BCL-2 protein and B-cell survival — defining the CD74/NF-κB/TAp63 antiapoptotic axis.","method":"CD74 stimulation in primary B cells; ChIP for TAp63 binding BCL-2 promoter; Western blot; flow cytometry for apoptosis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and functional rescue experiments in a single lab establish the pathway order","pmids":["17846227"],"is_preprint":false},{"year":2009,"finding":"CD74 forms a functional heteromeric receptor complex with CXCR4 at the cell surface; endogenous CD74/CXCR4 complexes were isolated by co-immunoprecipitation from monocytes, and MIF-stimulated AKT activation via CD74 was blocked by anti-CXCR4 antibody and AMD3100, while CXCL12-stimulated AKT was not reduced by anti-CD74.","method":"Co-immunoprecipitation from primary monocytes; CD74/CXCR4 co-expression in HEK293 cells; pharmacological blockade with AMD3100 and neutralizing antibodies; AKT phosphorylation by Western blot","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP from endogenous sources plus functional signaling rescue with multiple inhibitors, replicated in both primary cells and transfected cell lines","pmids":["19665027"],"is_preprint":false},{"year":2011,"finding":"MIF endocytosis follows a clathrin/dynamin-dependent pathway; CD74 overexpression markedly accelerates MIF internalization, CXCR4 blockade reduces it, and MIF/CD74/CXCR4 colocalize in endosomal compartments; endocytosis inhibitors reduce MIF-stimulated AKT signaling, indicating endosomal signaling.","method":"Pathway-specific endocytosis inhibitors (MDC, CPZ, dynasore, dominant-negative dynamin); CD74 overexpression in HEK293/HeLa; CXCR4 blockade with AMD3100; fluorescent MIF colocalization with endosomal markers; AKT Western blot","journal":"European journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal inhibitors, overexpression, and receptor blockade with colocalization studies and functional readout in a single rigorous study","pmids":["22014447"],"is_preprint":false},{"year":2014,"finding":"MIF promotes B-cell chemotaxis cooperatively through both CD74 and CXCR4; genetic deficiency of Cd74 or inhibition of CXCR4 fully abrogates MIF-induced migration; MIF stimulation activates the tyrosine kinase ZAP-70 in a CXCR4- and CD74-dependent manner, and ZAP-70 inhibition or knockdown abolishes migration.","method":"Primary murine B cells from Cd74-/- and ZAP-70-/- mice; Transwell migration assays; pharmacological inhibition of CXCR4, CD74, and ZAP-70; intracellular Ca2+ mobilization; F-actin polymerization; siRNA knockdown in Ramos cells","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mice plus pharmacological inhibition plus siRNA knockdown with specific migration phenotype, replicated across multiple approaches","pmids":["24760155"],"is_preprint":false},{"year":2014,"finding":"CD74-NRG1 fusion protein leads to extracellular display of the EGF-like domain of NRG1 III-β3, providing ligand for ERBB2-ERBB3 receptor complexes; ectopic expression in lung cancer cell lines activates ERBB3 phosphorylation, PI3K-AKT pathway, and promotes soft-agar colony formation.","method":"Transcriptome sequencing; ectopic expression in lung cancer cell lines (ERBB2/3-expressing); Western blot for phospho-ERBB3 and AKT; soft-agar colony formation assay; immunohistochemistry for phospho-ERBB3 in tumor tissues","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional overexpression with multiple orthogonal readouts (receptor phosphorylation, downstream signaling, anchorage-independent growth) and corroborated in patient tumor tissue","pmids":["24469108"],"is_preprint":false},{"year":2016,"finding":"Following MIF binding to CD74 and intramembrane cleavage, the released CD74 intracellular domain (CD74-ICD) acts as a transcriptional regulator in CLL B cells: it interacts with transcription factors RUNX and NF-κB and binds proximal and distal regulatory sites of genes involved in apoptosis, immune response, and cell migration.","method":"ChIP-seq for CD74-ICD binding in CLL cells; co-immunoprecipitation with RUNX and NF-κB; gene expression analysis following CD74 activation","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq genome-wide binding plus Co-IP for transcription factor interactions with multiple orthogonal approaches in a single rigorous study","pmids":["28031488"],"is_preprint":false},{"year":2022,"finding":"CD74-ICD in normal B cells forms a cytosolic complex with the transcription factor PAX5; this complex binds the promoter of the tumor-suppressor gene DMTF1 and downregulates its expression through inhibition of transcription, a function that is suppressed in CLL.","method":"Co-immunoprecipitation of CD74-ICD with PAX5; ChIP for CD74-ICD:PAX5 binding at DMTF1 promoter; gene expression analysis in normal vs. CLL B cells","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus Co-IP with functional gene expression readout, mechanistically distinguishing normal and malignant cells","pmids":["36323260"],"is_preprint":false},{"year":2008,"finding":"CD74 functions as a MIF receptor on podocytes: MIF activates cell-surface CD74 on cultured human podocytes, leading to phosphorylation of ERK1/2 and p38; MIF-induced expression of TRAIL and MCP-1 in podocytes and tubular cells occurs in a p38-dependent manner.","method":"Western blot for phospho-ERK1/2 and phospho-p38 in cultured podocytes; flow cytometry for cell-surface CD74; ELISA for TRAIL and MCP-1; p38 inhibitor experiments","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct receptor activation assay with downstream signaling readouts and pharmacological inhibitor rescue, single lab","pmids":["18842989"],"is_preprint":false},{"year":2013,"finding":"CD74 is required for MIF to inhibit osteoclastogenesis: MIF addition to WT bone marrow cultures inhibits osteoclast-like cell formation by 16%, but has no effect on CD74-KO cultures; CD74-KO mice display increased osteoclast numbers, decreased trabecular bone volume, and cortical bone loss similar to MIF-KO mice. MIF suppresses RANKL-induced NFATc1 and c-Fos protein in BMMs.","method":"Bone marrow cultures from CD74-KO and WT mice; osteoclast differentiation assay; micro-CT and histomorphometry; Western blot for NFATc1 and c-Fos","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO model with in vitro and in vivo bone phenotype, mechanistic downstream signaling readout, recapitulates MIF-KO phenotype","pmids":["23044992"],"is_preprint":false},{"year":2016,"finding":"MIF-CD74 signaling inhibits IFN-γ secretion in microglia through phosphorylation of ERK1/2, driving M2 polarization; siRNA-mediated or antibody-mediated inhibition of CD74 or MIF restores IFN-γ release, promotes M1 microglial polarization, and prolongs survival in glioma-implanted mice.","method":"siRNA knockdown and neutralizing antibody inhibition of CD74/MIF; Western blot for phospho-ERK1/2; IFN-γ ELISA; in vivo glioma implantation survival model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus antibody inhibition with signaling readout and in vivo validation, single lab","pmids":["27157615"],"is_preprint":false},{"year":2015,"finding":"IFN-γ enhances cell-surface CD74 expression on melanoma cells; CD74-MIF autocrine interaction activates PI3K/AKT (Ser473 phosphorylation), upregulates IL-6, IL-8, and BCL-2, and promotes tumor survival; blockade of CD74-MIF interaction reduces AKT phosphorylation and suppresses tumor growth in xenograft models.","method":"Western blot for phospho-AKT; flow cytometry for cell-surface CD74; neutralizing antibody blockade; xenograft mouse model; ELISA for cytokines","journal":"Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vitro and in vivo validation with signaling readouts, single lab","pmids":["26039541"],"is_preprint":false},{"year":2018,"finding":"Soluble CD74 (sCD74) co-treatment with MIF induces necroptosis in cardiac myofibroblasts via RIP1/RIP3-dependent mechanism; sCD74 diminishes MIF-mediated AKT activation and triggers p38 activation, rerouting survival signaling to necroptotic cell death specific to cardiac fibroblasts but not cardiomyocytes.","method":"Recombinant sCD74 and MIF co-treatment; RIP1/RIP3 inhibition assays; Western blot for AKT and p38 phosphorylation; microarray/RT-qPCR for interferon-induced genes; cell death quantification","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple signaling readouts plus pathway inhibitor rescue, single lab with two orthogonal methods","pmids":["30371153"],"is_preprint":false},{"year":2020,"finding":"CD74 signaling in intestinal epithelial cells is necessary for gut repair after colitis: MIF stimulates CD74 receptor, enhancing epithelial cell proliferation through activation of AKT and ERK pathways; CD74 signaling in immune cells was not essential for mucosal healing.","method":"CD74-/- mice and bone marrow chimera models; CRISPR/Cas9 CD74 knockout; anti-CD74 neutralizing antibodies; Western blot for phospho-AKT and phospho-ERK; immunohistochemistry; flow cytometry","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus bone marrow chimera plus antibody neutralization plus CRISPR with specific pathway readouts distinguish cell-type-specific requirements","pmids":["32004754"],"is_preprint":false},{"year":2010,"finding":"CD74 is expressed on normal colon epithelial cells; MIF stimulation of CD74 induces upregulation of Bcl-2 and increased survival of CEC from WT but not CD74-deficient mice; in CT26 colon carcinoma cells, MIF-CD74 signaling enhances cell survival, AKT phosphorylation, and Bcl-2 expression.","method":"RT-PCR, Western blot, FACS for CD74 expression; survival assays with CD74-KO mice CEC; Western blot for phospho-AKT and Bcl-2","journal":"World journal of gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CD74-KO comparison with multiple molecular readouts, single lab","pmids":["20614481"],"is_preprint":false},{"year":2014,"finding":"The HLA-DRα1 domain directly inhibits binding of MIF to CD74, blocking downstream inflammatory ERK1/2 signaling in the spinal cord in EAE; a single amino acid substitution (L50Q) enhances DRα1 affinity for CD74, increases MIF binding blockade, and improves therapeutic activity, identifying the MIF-binding region on CD74.","method":"MIF-CD74 binding competition assay; in vivo EAE mouse model; Western blot for pERK1/2; trypsin digestion functional assay; histological analysis","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding competition assay plus in vivo functional readout with mutagenesis, single lab","pmids":["24683185","30353480"],"is_preprint":false},{"year":2016,"finding":"CD74-NRG1 fusion promotes cancer stem cell-like properties via ErbB2/3 phosphorylation, activating PI3K/Akt/NF-κB, which in an NF-κB-dependent manner upregulates IGF2 secretion and IGF1R phosphorylation, establishing an IGF2 autocrine/paracrine circuit; inhibition of ErbB2, PI3K, NF-κB, or IGF2 suppresses tumor sphere formation.","method":"Ectopic expression of CD74-NRG1 in lung epithelial cells; Western blot for phospho-ErbB2/3, phospho-Akt, NF-κB; sphere formation assay; limiting dilution xenograft; NF-κB reporter; IGF2/IGF1R ELISA and Western blot; pharmacological inhibition","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple inhibitor experiments and in vivo xenograft with mechanistic pathway dissection, single lab","pmids":["26837769"],"is_preprint":false},{"year":2022,"finding":"CD74-NRG1 physically binds ERBB3, and this interaction drives ERBB2:ERBB3 heterodimerization as the mechanistic event in transformation; CD74-NRG1-expressing cells proliferate independent of exogenous NRG1 ligand; transgenic mice ubiquitously expressing CD74-NRG1 develop tumors at high frequency.","method":"CD74-NRG1 transgenic mouse model; ERBB3 binding assay; Western blot for phospho-ERBB2/ERBB3; proliferation assays in the absence of NRG1; pharmacological ERBB2/3 inhibition","journal":"Molecular cancer therapeutics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo transgenic model with direct physical binding evidence and functional independence from exogenous ligand, multiple orthogonal methods","pmids":["35247925"],"is_preprint":false},{"year":2019,"finding":"MIF-CD74 interaction directly regulates PD-L1 expression in melanoma: IFN-γ upregulates CD74 surface expression; blockade of CD74-MIF interaction with 4-IPP inhibitor or siRNA knockdown of MIF or CD74 suppresses PD-L1 expression; constitutive PD-L1 expression in WM1361A melanoma cells is also dependent on MIF-CD74.","method":"siRNA knockdown of CD74 and MIF; 4-IPP pharmacological inhibition; Western blot and flow cytometry for PD-L1; immunohistochemistry in patient melanoma tissues","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus pharmacological inhibition with multiple readouts confirming mechanistic link, single lab","pmids":["31069878"],"is_preprint":false},{"year":2021,"finding":"CD74 absence in mice leads to accumulation of hematopoietic stem cells (HSCs) in bone marrow due to increased repopulation potential and competition for BM niches; CD74-KO HSCs show increased survival and accumulation of both quiescent and proliferating cells; CD74 regulates CD18 expression on HSCs. In vitro CD74 blockade elevated HSPC numbers.","method":"CD74-KO mouse analysis; competitive repopulation assays; BM transplantation; flow cytometry for HSC populations; in vitro HSPC expansion with CD74 blockade","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with competitive repopulation and in vitro validation using multiple orthogonal approaches","pmids":["33661886"],"is_preprint":false},{"year":2016,"finding":"CD74 silencing in macrophages diminishes adhesion molecule expression (ALCAM, ICAM4, Syndecan-2), reduces macrophage adhesion to trophoblasts, and shifts macrophage activation toward a pro-inflammatory signature with increased TNF-α, CCL5, and MCP-1 secretion; CD74-KO mice display disturbed placental morphology, reduced junctional zone, impaired spiral artery remodeling, and fetal growth restriction.","method":"CD74 siRNA silencing in macrophages; co-culture of macrophages with trophoblasts; flow cytometry and RT-PCR; CD74-KO mouse placental analysis; immunofluorescence","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse model with in vitro siRNA silencing, multiple orthogonal readouts (adhesion, cytokines, placental morphometry)","pmids":["27199465"],"is_preprint":false},{"year":2019,"finding":"MIF activates CD74 on atrial cardiomyocytes to increase calcium transients, SR calcium content, NCX efflux, calcium leak, and potassium currents; MIF induces SERCA, NCX, and phosphorylation of RyR2 and activates CaMKII; these electrophysiological effects and CaMKII-RyR2 signaling activation are attenuated by anti-CD74 neutralizing antibody.","method":"Patch clamp electrophysiology; confocal fluorescence microscopy for calcium; Western blot for signaling proteins; anti-CD74 neutralizing antibody treatment; electrocardiographic telemetry in MIF-injected mice","journal":"Translational research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patch clamp and calcium imaging with antibody rescue plus in vivo echocardiography, single lab","pmids":["31669150"],"is_preprint":false},{"year":2020,"finding":"CD74 ablation protects against LPS-induced cardiac dysfunction through suppression of autophagy via an AMPK-Skp2-SUV39H1-mediated mechanism: CD74-KO reverses LPS-induced Skp2 downregulation and SUV39H1/H3K9 methylation of BCLB; AMPK activator or rapamycin nullifies CD74 KO protection.","method":"CD74-KO mouse echocardiography; cardiomyocyte contractile function assay; Western blot for AMPK, mTOR, Skp2, SUV39H1, H3K9 methylation; GFP-LC3B autophagy reporter; pharmacological inhibitors (AICAR, rapamycin, chaetocin)","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with multiple pathway inhibitors defining epistatic order, single lab","pmids":["31877229"],"is_preprint":false},{"year":2023,"finding":"TIMP-1 shares CD74-binding residues with MIF and MIF-2 (but not CXCR4-binding residues); TIMP-1 interacts with surface-expressed CD74 causing its internalization, and activates AKT and ERK1/2 phosphorylation in monocytes via CD74; this TIMP-1-CD74 axis promotes monocyte recruitment responses and VSMC proliferation.","method":"Sequence alignment and in silico docking; subcellular colocalization; co-immunoprecipitation; internalization assay; phospho-kinase array; AKT/ERK Western blot; Transwell migration and flow adhesion assays; live cell imaging for VSMC proliferation","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical and functional assays in a single study, single lab; structural analysis is in silico","pmids":["37508563"],"is_preprint":false},{"year":2024,"finding":"CD74 is upregulated on activated CD4+ T cells post-translationally modified by chondroitin sulfate and traffics to the cell surface; proximity ligation assay demonstrates CD74/CXCR4 heterocomplexes on activated T cells that diminish after MIF treatment, indicating MIF-induced internalization; CD74 and CXCR4 cooperatively mediate MIF-induced T cell migration.","method":"Flow cytometry; Western blot; immunohistochemistry; proximity ligation assay; 3D-matrix live cell imaging; receptor pathway-specific inhibitors; re-analysis of RNA-seq and proteomics data","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity ligation assay plus functional migration assays with inhibitors, multiple orthogonal methods, single lab","pmids":["38992165"],"is_preprint":false},{"year":2024,"finding":"Genetic deletion of CD74 in human primary Tregs causes major defects in actin cytoskeleton organization and intracellular organelle arrangement; intratumoral CD74-KO Tregs show decreased activation, reduced Foxp3 expression, and impaired accumulation in tumors, leading to accelerated tumor rejection in preclinical models; CD74 effects are tumor-specific and do not affect Treg phenotype or suppressive capacity at steady state.","method":"CD74 genetic deletion in human primary Tregs (CRISPR); actin cytoskeleton imaging; flow cytometry for activation markers and Foxp3; intratumoral Treg accumulation assays; preclinical mouse tumor models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — human primary Treg genetic deletion with multiple orthogonal cellular readouts and in vivo tumor model validation","pmids":["38702311"],"is_preprint":false},{"year":2024,"finding":"APP on GBM tumor cell surfaces binds the CD74/CXCR4 receptor complex on tumor-associated macrophages, promoting phosphorylation of SHP-1 and thereby inhibiting TAM phagocytosis; disrupting the APP-CD74 axis upregulates TAM phagocytosis in vitro and in vivo.","method":"Cell-cell communication analysis (scRNA-seq); co-immunoprecipitation; SHP-1 phosphorylation Western blot; phagocytosis assays in vitro and in vivo","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical binding evidence plus functional phagocytosis assay with in vivo validation, single lab","pmids":["39111632"],"is_preprint":false},{"year":2024,"finding":"In triple-negative breast cancer, MIF from tumor cells activates CD74 on dendritic cells, inducing CD74-ICD binding to the SP1 promoter, upregulating SP1, which binds the IL-1β promoter to downregulate IL-1β transcription; reduced IL-1β leads to expansion of tolerogenic DCs and regulatory B cells, suppressing anti-tumor immunity.","method":"CD74-KO mice; Cre-flox conditional KO in CD23+ B cells and CD11c+ DCs; CD74 inhibitor (DRQ); ChIP for CD74-ICD binding SP1 promoter; Western blot; flow cytometry for tol-DC and Breg populations; tumor growth assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KOs plus ChIP for promoter binding plus pharmacological inhibition with multiple functional readouts","pmids":["39576827"],"is_preprint":false},{"year":2024,"finding":"CD74 functions as a transcriptional factor in ADPKD: CD74 binds promoters of fibrotic markers (collagen I, fibronectin, α-SMA) to upregulate them; CD74 also binds the MIF promoter to form a positive feedback loop where MIF activates CD74 signaling and CD74 increases MIF expression; CD74-KO normalizes ERK, mTOR, and Rb signaling and reduces NF-κB/MCP-1/TNF-α-dependent macrophage recruitment.","method":"CD74-KO in Pkd1 mutant mice; ChIP for CD74 binding fibrotic gene promoters and MIF promoter; Western blot for ERK/mTOR/Rb/NF-κB; ELISA for MCP-1/TNF-α; histology for macrophage recruitment and fibrosis; cell proliferation assays","journal":"Cells","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in disease model plus ChIP for direct promoter binding plus multiple downstream readouts and positive feedback loop validation","pmids":["38534333"],"is_preprint":false},{"year":2025,"finding":"CD74 signaling drives inflammation in RUNX1-FPD hematopoietic stem/progenitor cells through activation of mTOR and JAK/STAT pathways with increased cytokine production; genetic and pharmacological CD74 targeting (ISO-1) reverses myeloid-biased differentiation defects and reduces inflammation both in vitro and in vivo.","method":"Single-cell RNA sequencing of patient FPD samples; Western blot and phospho-flow for mTOR/JAK/STAT; CD74 genetic targeting; ISO-1 pharmacological inhibition; in vitro and in vivo differentiation assays; cytokine profiling","journal":"Science translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — scRNA-seq with functional genetic and pharmacological validation in vitro and in vivo, single lab","pmids":["39772771"],"is_preprint":false},{"year":2016,"finding":"Predicted structural modeling of MIF/CD74 interaction reveals 3 binding sites on the MIF homotrimer each engaging one CD74 trimer through two distinct 5-amino-acid determinants, forming a predicted MIF(CD74)3 dodecamer; the same CD74 determinants are used by the competitive inhibitor RTL1000.","method":"In silico protein-protein docking of MIF trimer and CD74 trimer; structural modeling of CD74-RTL1000 complex","journal":"Metabolic brain disease","confidence":"Low","confidence_rationale":"Tier 4 / Weak — purely computational structural prediction without experimental validation","pmids":["26851955"],"is_preprint":false},{"year":2022,"finding":"The CD74 p41 splice isoform specifically inhibits cathepsin L (CTSL) activity; in arthritis, the p41 isoform is differentially expressed in severely affected tissue and correlates with TNF expression; M1-like macrophages express higher CD74 and have higher CTSL secretion/activity than M2-like macrophages; RA patients responding to TNF blockade show higher CD74 in circulating monocytes post-treatment.","method":"qPCR for CD74 isoforms; CTSL enzymatic activity assay; macrophage polarization in vitro; flow cytometry; collagen-induced arthritis mouse model","journal":"Journal of autoimmunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic activity assay plus in vitro macrophage polarization plus in vivo correlation, single lab","pmids":["35245865"],"is_preprint":false},{"year":2011,"finding":"FTY720 induces lysosomal membrane permeabilization and blocks autophagic-lysosomal degradation, leading to increased CD74 levels; CD74 is normally degraded in the lysosomal compartment.","method":"Western blot for CD74, LC3-II, and p62; fluorescence microscopy for autolysosomes; lysosomal hydrolase translocation assay in MCL cell lines","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic link between lysosomal pathway and CD74 levels established via multiple biochemical readouts, single lab","pmids":["22042694"],"is_preprint":false},{"year":2014,"finding":"CD74 suppression in lymphoma cells (BJAB, Raji) increases surface Fas receptor expression, enhances caspase-8 and caspase-3 cleavage upon FasL stimulation, and sensitizes cells to Fas-mediated apoptosis and chemotherapy; conversely, full-length CD74 overexpression in livers protects mice from lethal anti-Fas challenge, indicating CD74 interferes with early Fas signaling at the plasma membrane.","method":"shRNA-mediated CD74 knockdown; hydrodynamic transfection with full-length CD74 in mice; flow cytometry for Fas surface expression; Western blot for caspase-8/-3 cleavage; FasL challenge survival assay","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown plus overexpression in vivo with mechanistic signaling readout, single lab","pmids":["25304249"],"is_preprint":false},{"year":2005,"finding":"Gastric epithelial cells constitutively express CD74 (invariant chain) mRNA and all protein isoforms; CD74 surface expression is polarized to the apical surface of these non-conventional antigen-presenting cells, as determined by immunohistochemistry on human biopsies and multiple gastric epithelial cell lines.","method":"RT-PCR for CD74 mRNA; Western blot for CD74 isoforms; immunohistochemistry and immunofluorescence on human gastric biopsies and cell lines; polarized expression confirmed by confocal imaging","journal":"Journal of histochemistry and cytochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — first demonstration of apical polarization using multiple orthogonal methods in human tissue and cell lines, single lab","pmids":["15923369"],"is_preprint":false}],"current_model":"CD74 is a type II transmembrane protein that functions as the primary cell-surface receptor for the cytokine MIF (and related ligands MIF-2/D-DT, TIMP-1), forming functional heteromeric complexes with CD44, CXCR4, and CXCR2 to transduce signals via ERK1/2, PI3K-AKT, NF-κB, and p38 pathways; upon MIF binding, CD74 undergoes intramembrane cleavage releasing a cytosolic intracellular domain (CD74-ICD) that acts as a transcriptional co-regulator by interacting with NF-κB, RUNX, and PAX5 to control survival, differentiation, and immune-response gene expression in B cells and other cell types; CD74 also functions as a chaperone mediating MHC class II antigen presentation, is regulated through lysosomal degradation (with lysosomal blockade increasing CD74 levels), controls Fas receptor surface availability to modulate apoptosis sensitivity, and drives disease-relevant processes including B-cell survival, HSC homeostasis, Treg tumor infiltration, osteoclastogenesis, and intestinal epithelial repair."},"narrative":{"mechanistic_narrative":"CD74 is a type II transmembrane protein that serves as the principal cell-surface receptor for the cytokine MIF (and the structurally related ligands MIF-2 and TIMP-1), transducing extracellular signals into proliferative, survival, migratory, and immune-modulatory programs across diverse cell types [PMID:19665027, PMID:24760155, PMID:37508563]. Productive signaling requires CD74 to assemble into heteromeric receptor complexes, most prominently with CXCR4, which co-immunoprecipitates with CD74 from monocytes and is required for MIF-stimulated AKT activation, endosomal trafficking of internalized ligand, ZAP-70 activation, and chemotaxis [PMID:19665027, PMID:22014447, PMID:24760155, PMID:38992165]. Ligand engagement drives a recurring set of downstream cascades — PI3K/AKT, ERK1/2, p38, and NF-κB — whose outputs are context-dependent: in B cells and epithelial/tumor cells they promote survival and proliferation through NF-κB-driven TAp63/BCL-2 and BCL-XL induction [PMID:16484589, PMID:17846227, PMID:20614481], whereas soluble CD74 can reroute MIF signaling toward RIP1/RIP3 necroptosis [PMID:30371153]. Beyond surface signaling, MIF binding triggers intramembrane cleavage that liberates the CD74 intracellular domain (CD74-ICD), which translocates to the nucleus and functions as a transcriptional regulator: it partners with RUNX and NF-κB on apoptosis, immune, and migration genes in CLL B cells, forms a cytosolic complex with PAX5 to repress the tumor suppressor DMTF1, and directs SP1-mediated IL-1β repression in dendritic cells [PMID:28031488, PMID:36323260, PMID:39576827]. CD74 also acts as a transcription factor in its own right in polycystic kidney disease, binding fibrotic gene and MIF promoters to establish a feed-forward inflammatory loop [PMID:38534333]. Through these activities CD74 governs B-cell and HSC homeostasis, regulatory T-cell tumor infiltration, macrophage polarization and phagocytosis, osteoclastogenesis, and intestinal epithelial repair [PMID:24760155, PMID:23044992, PMID:32004754, PMID:33661886, PMID:38702311, PMID:39111632]. A recurrent CD74-NRG1 gene fusion exploits the CD74 transmembrane anchor to display the NRG1 EGF-like domain extracellularly, driving ERBB2:ERBB3 heterodimerization and oncogenic transformation [PMID:24469108, PMID:35247925]. CD74 protein levels are set in part by lysosomal degradation [PMID:22042694].","teleology":[{"year":2006,"claim":"Established that CD74 is not merely an MHC class II chaperone but an active surface receptor whose engagement drives B-cell proliferation and survival.","evidence":"Anti-CD74 antibody stimulation of B cells with NF-κB reporter, BrdU, and BCL-XL readouts","pmids":["16484589"],"confidence":"Medium","gaps":["Identity of the physiological ligand not addressed in this study","Receptor partners mediating signaling not yet defined"]},{"year":2007,"claim":"Defined the pathway order downstream of CD74, showing NF-κB induces TAp63 which transactivates BCL-2 to confer the antiapoptotic effect.","evidence":"CD74 stimulation in primary B cells with ChIP for TAp63 at the BCL-2 promoter and apoptosis assays","pmids":["17846227"],"confidence":"Medium","gaps":["Generalizability of the TAp63 axis beyond B cells unknown","Direct CD74-to-NF-κB coupling mechanism not resolved"]},{"year":2009,"claim":"Resolved how CD74 transduces signal despite a short cytoplasmic tail by demonstrating a functional CD74/CXCR4 heteromeric receptor complex.","evidence":"Reciprocal Co-IP from primary monocytes plus AMD3100/antibody blockade of MIF-induced AKT in transfected cells","pmids":["19665027"],"confidence":"High","gaps":["Stoichiometry and structural architecture of the complex not determined","Whether all CD74 signaling requires CXCR4 not established"]},{"year":2011,"claim":"Showed MIF/CD74/CXCR4 signaling occurs from endosomes following clathrin/dynamin-dependent internalization, linking receptor trafficking to signal output.","evidence":"Endocytosis inhibitors, CD74 overexpression, CXCR4 blockade, endosomal colocalization, and AKT readout in HEK293/HeLa","pmids":["22014447"],"confidence":"High","gaps":["Adaptor proteins linking CD74 to clathrin machinery unidentified","Fate of internalized receptor (recycling vs degradation) not traced here"]},{"year":2014,"claim":"Demonstrated CD74/CXCR4 cooperatively drive MIF-induced chemotaxis via ZAP-70, defining a migratory effector arm.","evidence":"Cd74-/- and ZAP-70-/- mouse B cells, Transwell migration, Ca2+ and F-actin assays, siRNA in Ramos cells","pmids":["24760155"],"confidence":"High","gaps":["Mechanism coupling CD74 to ZAP-70 activation unknown","Whether other cell types use this ZAP-70 route untested"]},{"year":2014,"claim":"Mapped the MIF-binding region on CD74 by showing HLA-DRα1 competitively blocks MIF binding and an L50Q mutation enhances blockade.","evidence":"MIF-CD74 binding competition assay, EAE model, pERK1/2 readout, and mutagenesis","pmids":["24683185","30353480"],"confidence":"Medium","gaps":["No high-resolution structure of the MIF-CD74 interface","Affinity quantification limited"]},{"year":2016,"claim":"Discovered that the cleaved CD74-ICD acts as a nuclear transcriptional regulator, connecting surface engagement to gene-expression control in CLL.","evidence":"ChIP-seq for CD74-ICD binding plus Co-IP with RUNX and NF-κB in CLL cells","pmids":["28031488"],"confidence":"High","gaps":["Protease performing intramembrane cleavage not identified","Mechanism of ICD nuclear import unresolved"]},{"year":2022,"claim":"Identified a CD74-ICD:PAX5 complex repressing the tumor suppressor DMTF1 in normal B cells, a function lost in CLL, extending the transcriptional role of the ICD.","evidence":"Co-IP of CD74-ICD with PAX5 and ChIP at the DMTF1 promoter in normal vs CLL B cells","pmids":["36323260"],"confidence":"High","gaps":["How CLL disrupts this repression mechanistically unclear","Direct DNA contact vs PAX5-tethered binding not distinguished"]},{"year":2024,"claim":"Expanded CD74-ICD transcriptional control to dendritic cells, where it induces SP1 to repress IL-1β and promote tolerogenic immunity in breast cancer.","evidence":"Cell-type-specific conditional KO, ChIP for CD74-ICD at the SP1 promoter, and tol-DC/Breg profiling","pmids":["39576827"],"confidence":"High","gaps":["Direct ICD-SP1 promoter binding vs co-factor recruitment not fully separated","Translation to human tumors not shown"]},{"year":2024,"claim":"Showed CD74 itself binds gene promoters as a transcription factor in ADPKD, upregulating fibrotic genes and MIF in a feed-forward loop.","evidence":"CD74-KO in Pkd1 mutant mice with ChIP at fibrotic and MIF promoters and pathway Western blots","pmids":["38534333"],"confidence":"High","gaps":["Whether full-length CD74 or ICD mediates promoter binding ambiguous","Direct DNA-binding domain not mapped"]},{"year":2014,"claim":"Established the CD74-NRG1 fusion as an oncogenic driver that displays the NRG1 EGF-like domain to activate ERBB3/PI3K-AKT.","evidence":"Transcriptome sequencing, ectopic expression in lung cancer lines, phospho-ERBB3/AKT, and soft-agar assays","pmids":["24469108"],"confidence":"High","gaps":["In vivo tumorigenicity not yet shown at this stage","Whether endogenous CD74 functions feed into fusion signaling unknown"]},{"year":2022,"claim":"Confirmed CD74-NRG1 directly binds ERBB3 to force ERBB2:ERBB3 heterodimerization and drive ligand-independent transformation in vivo.","evidence":"CD74-NRG1 transgenic mice, ERBB3 binding assay, and NRG1-independent proliferation","pmids":["35247925","26837769"],"confidence":"High","gaps":["Contribution of the CD74 portion beyond membrane anchoring unclear","Therapeutic vulnerabilities of the fusion in patients not addressed"]},{"year":2018,"claim":"Revealed that soluble CD74 reroutes MIF signaling from AKT survival to RIP1/RIP3 necroptosis, showing receptor solubility tunes cell-fate output.","evidence":"Recombinant sCD74/MIF co-treatment with RIP1/RIP3 inhibition and AKT/p38 readouts in cardiac fibroblasts","pmids":["30371153"],"confidence":"Medium","gaps":["Source and physiological abundance of soluble CD74 unclear","Cell-type specificity mechanism not resolved"]},{"year":2023,"claim":"Broadened the CD74 ligand repertoire by showing TIMP-1 engages CD74 (sharing MIF-binding residues) to trigger internalization and AKT/ERK signaling.","evidence":"In silico docking, Co-IP, internalization, phospho-kinase array, and migration assays in monocytes","pmids":["37508563"],"confidence":"Medium","gaps":["Structural interface is computational only","Whether TIMP-1 requires CXCR4 not established"]},{"year":2021,"claim":"Defined a homeostatic role for CD74 in restraining hematopoietic stem cell repopulation and niche competition.","evidence":"CD74-KO mice, competitive repopulation, BM transplantation, and in vitro HSPC expansion with CD74 blockade","pmids":["33661886"],"confidence":"High","gaps":["Ligand driving HSC CD74 signaling not identified","Downstream effectors beyond CD18 regulation unclear"]},{"year":2024,"claim":"Showed CD74 is required for regulatory T-cell cytoskeletal organization and tumor infiltration, marking it as an immune-evasion node.","evidence":"CRISPR deletion in human primary Tregs, actin imaging, and preclinical tumor models","pmids":["38702311"],"confidence":"High","gaps":["Molecular link from CD74 to actin cytoskeleton unresolved","Tumor-specific (vs steady-state) signaling trigger unknown"]},{"year":2024,"claim":"Showed CD74-ICD-independent surface CD74/CXCR4 complexes mediate MIF-induced T-cell migration and demonstrated chondroitin-sulfate-modified CD74 trafficking.","evidence":"Proximity ligation assay, 3D-matrix imaging, and pathway inhibitors in activated CD4+ T cells","pmids":["38992165"],"confidence":"Medium","gaps":["Functional role of chondroitin sulfate modification not dissected","Dynamics of complex disassembly upon MIF not quantified"]},{"year":2024,"claim":"Implicated CD74/CXCR4 on macrophages as a phagocytosis checkpoint engaged by tumor APP via SHP-1.","evidence":"scRNA-seq cell-cell analysis, Co-IP, SHP-1 phosphorylation, and phagocytosis assays in GBM","pmids":["39111632"],"confidence":"Medium","gaps":["Direct APP-CD74 binding affinity not measured","Whether MIF competes with APP at CD74 untested"]},{"year":2014,"claim":"Showed CD74 limits Fas surface availability to set apoptosis sensitivity, a function distinct from its ligand-receptor signaling.","evidence":"shRNA knockdown and in vivo full-length CD74 overexpression with Fas surface and caspase readouts","pmids":["25304249"],"confidence":"Medium","gaps":["Mechanism by which CD74 retains Fas intracellularly unknown","Whether ICD or surface CD74 mediates the effect unclear"]},{"year":2011,"claim":"Linked CD74 protein abundance to lysosomal/autophagic degradation, identifying a level-setting mechanism exploitable pharmacologically.","evidence":"FTY720-induced lysosomal permeabilization with CD74, LC3-II, p62 Western blots in MCL lines","pmids":["22042694"],"confidence":"Medium","gaps":["Specific lysosomal proteases acting on CD74 not identified","Connection to ICD generation not addressed"]},{"year":2022,"claim":"Assigned a protease-regulatory activity to the CD74 p41 isoform as a cathepsin L inhibitor relevant to macrophage polarization in arthritis.","evidence":"CTSL enzymatic assay, isoform qPCR, macrophage polarization, and collagen-induced arthritis model","pmids":["35245865"],"confidence":"Medium","gaps":["In vivo consequences of CTSL inhibition by p41 not isolated","Relationship to MIF-receptor function unclear"]},{"year":null,"claim":"The structural basis of MIF/CD74 receptor assembly, the protease responsible for CD74 intramembrane cleavage, and the determinants of context-specific downstream output (survival vs death, transcriptional repression vs activation) remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experimentally determined MIF-CD74 complex structure","Cleavage protease generating CD74-ICD unidentified","Rules governing which cell types use CXCR4, CXCR2, or CD44 co-receptors not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,4,8,23]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6,7,27,28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[31,33]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[2,3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,8,11,34]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,7,28]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[32]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,8,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,25,26,27]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,7,27,28]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,17,28,29]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,33]}],"complexes":["CD74/CXCR4 receptor complex"],"partners":["MIF","CXCR4","TIMP-1","RUNX","NF-KB","PAX5","ERBB3","APP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04233","full_name":"HLA class II histocompatibility antigen gamma chain","aliases":["HLA-DR antigens-associated invariant chain","Ia antigen-associated invariant chain","Ii"],"length_aa":296,"mass_kda":33.5,"function":"Plays a critical role in MHC class II antigen processing by stabilizing peptide-free class II alpha/beta heterodimers in a complex soon after their synthesis and directing transport of the complex from the endoplasmic reticulum to the endosomal/lysosomal system where the antigen processing and binding of antigenic peptides to MHC class II takes place. Serves as cell surface receptor for the cytokine MIF Binds to the peptide-binding site of MHC class II alpha/beta heterodimers forming an alpha-beta-CLIP complex, thereby preventing the loading of antigenic peptides to the MHC class II complex until its release by HLA-DM in the endosome Stabilizes the conformation of mature CTSL by binding to its active site and serving as a chaperone to help maintain a pool of mature enzyme in endocytic compartments and extracellular space of antigen-presenting cells (APCs). Has antiviral activity by stymieing the endosomal entry of Ebola virus and coronaviruses, including SARS-CoV-2 (PubMed:32855215). Disrupts cathepsin-mediated Ebola virus glycoprotein processing, which prevents viral fusion and entry. This antiviral activity is specific to p41 isoform (PubMed:32855215)","subcellular_location":"Late endosome; Lysosome","url":"https://www.uniprot.org/uniprotkb/P04233/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CD74","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CD74","total_profiled":1310},"omim":[{"mim_id":"619549","title":"IMMUNODEFICIENCY 86; IMD86","url":"https://www.omim.org/entry/619549"},{"mim_id":"617076","title":"FK506-BINDING PROTEIN-LIKE; FKBPL","url":"https://www.omim.org/entry/617076"},{"mim_id":"615161","title":"MAJOR HISTOCOMPATIBILITY COMPLEX, CLASS II, DQ BETA-2; HLA-DQB2","url":"https://www.omim.org/entry/615161"},{"mim_id":"613503","title":"MAJOR HISTOCOMPATIBILITY COMPLEX, CLASS II, DQ ALPHA-2; HLA-DQA2","url":"https://www.omim.org/entry/613503"},{"mim_id":"608238","title":"SIGNAL PEPTIDE PEPTIDASE-LIKE 2A; SPPL2A","url":"https://www.omim.org/entry/608238"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":4925.3}],"url":"https://www.proteinatlas.org/search/CD74"},"hgnc":{"alias_symbol":["CLIP"],"prev_symbol":["DHLAG"]},"alphafold":{"accession":"P04233","domains":[{"cath_id":"1.10.870.10","chopping":"139-198","consensus_level":"medium","plddt":83.3537,"start":139,"end":198},{"cath_id":"4.10.800.10","chopping":"221-272","consensus_level":"medium","plddt":91.5646,"start":221,"end":272},{"cath_id":"1.20.5","chopping":"56-97","consensus_level":"medium","plddt":80.3319,"start":56,"end":97}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P04233","model_url":"https://alphafold.ebi.ac.uk/files/AF-P04233-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P04233-F1-predicted_aligned_error_v6.png","plddt_mean":69.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CD74","jax_strain_url":"https://www.jax.org/strain/search?query=CD74"},"sequence":{"accession":"P04233","fasta_url":"https://rest.uniprot.org/uniprotkb/P04233.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P04233/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P04233"}},"corpus_meta":[{"pmid":"16484589","id":"PMC_16484589","title":"Cell-surface CD74 initiates a signaling cascade leading to cell proliferation and survival.","date":"2006","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/16484589","citation_count":249,"is_preprint":false},{"pmid":"27752708","id":"PMC_27752708","title":"The biological function and significance of CD74 in immune diseases.","date":"2016","source":"Inflammation research : official journal of the European Histamine Research Society ... 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\"finding\": \"Cell-surface CD74 stimulation with anti-CD74 antibody triggers a signaling cascade leading to NF-κB (p65/RelA) activation, entry into S phase, DNA synthesis, cell division, and upregulation of BCL-XL, establishing CD74 as a survival receptor on B cells.\",\n      \"method\": \"Anti-CD74 antibody stimulation of B cells; NF-κB reporter assays; BrdU incorporation; flow cytometry for cell cycle; Western blot for BCL-XL\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean functional antibody stimulation with multiple orthogonal readouts (cell cycle, DNA synthesis, NF-κB, survival gene expression) in a single lab\",\n      \"pmids\": [\"16484589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CD74 activation by MIF/anti-CD74 induces NF-κB p65, which upregulates TAp63 expression; TAp63 then binds and transactivates the BCL-2 gene promoter, increasing BCL-2 protein and B-cell survival — defining the CD74/NF-κB/TAp63 antiapoptotic axis.\",\n      \"method\": \"CD74 stimulation in primary B cells; ChIP for TAp63 binding BCL-2 promoter; Western blot; flow cytometry for apoptosis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and functional rescue experiments in a single lab establish the pathway order\",\n      \"pmids\": [\"17846227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CD74 forms a functional heteromeric receptor complex with CXCR4 at the cell surface; endogenous CD74/CXCR4 complexes were isolated by co-immunoprecipitation from monocytes, and MIF-stimulated AKT activation via CD74 was blocked by anti-CXCR4 antibody and AMD3100, while CXCL12-stimulated AKT was not reduced by anti-CD74.\",\n      \"method\": \"Co-immunoprecipitation from primary monocytes; CD74/CXCR4 co-expression in HEK293 cells; pharmacological blockade with AMD3100 and neutralizing antibodies; AKT phosphorylation by Western blot\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP from endogenous sources plus functional signaling rescue with multiple inhibitors, replicated in both primary cells and transfected cell lines\",\n      \"pmids\": [\"19665027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MIF endocytosis follows a clathrin/dynamin-dependent pathway; CD74 overexpression markedly accelerates MIF internalization, CXCR4 blockade reduces it, and MIF/CD74/CXCR4 colocalize in endosomal compartments; endocytosis inhibitors reduce MIF-stimulated AKT signaling, indicating endosomal signaling.\",\n      \"method\": \"Pathway-specific endocytosis inhibitors (MDC, CPZ, dynasore, dominant-negative dynamin); CD74 overexpression in HEK293/HeLa; CXCR4 blockade with AMD3100; fluorescent MIF colocalization with endosomal markers; AKT Western blot\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal inhibitors, overexpression, and receptor blockade with colocalization studies and functional readout in a single rigorous study\",\n      \"pmids\": [\"22014447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MIF promotes B-cell chemotaxis cooperatively through both CD74 and CXCR4; genetic deficiency of Cd74 or inhibition of CXCR4 fully abrogates MIF-induced migration; MIF stimulation activates the tyrosine kinase ZAP-70 in a CXCR4- and CD74-dependent manner, and ZAP-70 inhibition or knockdown abolishes migration.\",\n      \"method\": \"Primary murine B cells from Cd74-/- and ZAP-70-/- mice; Transwell migration assays; pharmacological inhibition of CXCR4, CD74, and ZAP-70; intracellular Ca2+ mobilization; F-actin polymerization; siRNA knockdown in Ramos cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mice plus pharmacological inhibition plus siRNA knockdown with specific migration phenotype, replicated across multiple approaches\",\n      \"pmids\": [\"24760155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CD74-NRG1 fusion protein leads to extracellular display of the EGF-like domain of NRG1 III-β3, providing ligand for ERBB2-ERBB3 receptor complexes; ectopic expression in lung cancer cell lines activates ERBB3 phosphorylation, PI3K-AKT pathway, and promotes soft-agar colony formation.\",\n      \"method\": \"Transcriptome sequencing; ectopic expression in lung cancer cell lines (ERBB2/3-expressing); Western blot for phospho-ERBB3 and AKT; soft-agar colony formation assay; immunohistochemistry for phospho-ERBB3 in tumor tissues\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional overexpression with multiple orthogonal readouts (receptor phosphorylation, downstream signaling, anchorage-independent growth) and corroborated in patient tumor tissue\",\n      \"pmids\": [\"24469108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Following MIF binding to CD74 and intramembrane cleavage, the released CD74 intracellular domain (CD74-ICD) acts as a transcriptional regulator in CLL B cells: it interacts with transcription factors RUNX and NF-κB and binds proximal and distal regulatory sites of genes involved in apoptosis, immune response, and cell migration.\",\n      \"method\": \"ChIP-seq for CD74-ICD binding in CLL cells; co-immunoprecipitation with RUNX and NF-κB; gene expression analysis following CD74 activation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq genome-wide binding plus Co-IP for transcription factor interactions with multiple orthogonal approaches in a single rigorous study\",\n      \"pmids\": [\"28031488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CD74-ICD in normal B cells forms a cytosolic complex with the transcription factor PAX5; this complex binds the promoter of the tumor-suppressor gene DMTF1 and downregulates its expression through inhibition of transcription, a function that is suppressed in CLL.\",\n      \"method\": \"Co-immunoprecipitation of CD74-ICD with PAX5; ChIP for CD74-ICD:PAX5 binding at DMTF1 promoter; gene expression analysis in normal vs. CLL B cells\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus Co-IP with functional gene expression readout, mechanistically distinguishing normal and malignant cells\",\n      \"pmids\": [\"36323260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CD74 functions as a MIF receptor on podocytes: MIF activates cell-surface CD74 on cultured human podocytes, leading to phosphorylation of ERK1/2 and p38; MIF-induced expression of TRAIL and MCP-1 in podocytes and tubular cells occurs in a p38-dependent manner.\",\n      \"method\": \"Western blot for phospho-ERK1/2 and phospho-p38 in cultured podocytes; flow cytometry for cell-surface CD74; ELISA for TRAIL and MCP-1; p38 inhibitor experiments\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct receptor activation assay with downstream signaling readouts and pharmacological inhibitor rescue, single lab\",\n      \"pmids\": [\"18842989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CD74 is required for MIF to inhibit osteoclastogenesis: MIF addition to WT bone marrow cultures inhibits osteoclast-like cell formation by 16%, but has no effect on CD74-KO cultures; CD74-KO mice display increased osteoclast numbers, decreased trabecular bone volume, and cortical bone loss similar to MIF-KO mice. MIF suppresses RANKL-induced NFATc1 and c-Fos protein in BMMs.\",\n      \"method\": \"Bone marrow cultures from CD74-KO and WT mice; osteoclast differentiation assay; micro-CT and histomorphometry; Western blot for NFATc1 and c-Fos\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO model with in vitro and in vivo bone phenotype, mechanistic downstream signaling readout, recapitulates MIF-KO phenotype\",\n      \"pmids\": [\"23044992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MIF-CD74 signaling inhibits IFN-γ secretion in microglia through phosphorylation of ERK1/2, driving M2 polarization; siRNA-mediated or antibody-mediated inhibition of CD74 or MIF restores IFN-γ release, promotes M1 microglial polarization, and prolongs survival in glioma-implanted mice.\",\n      \"method\": \"siRNA knockdown and neutralizing antibody inhibition of CD74/MIF; Western blot for phospho-ERK1/2; IFN-γ ELISA; in vivo glioma implantation survival model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus antibody inhibition with signaling readout and in vivo validation, single lab\",\n      \"pmids\": [\"27157615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IFN-γ enhances cell-surface CD74 expression on melanoma cells; CD74-MIF autocrine interaction activates PI3K/AKT (Ser473 phosphorylation), upregulates IL-6, IL-8, and BCL-2, and promotes tumor survival; blockade of CD74-MIF interaction reduces AKT phosphorylation and suppresses tumor growth in xenograft models.\",\n      \"method\": \"Western blot for phospho-AKT; flow cytometry for cell-surface CD74; neutralizing antibody blockade; xenograft mouse model; ELISA for cytokines\",\n      \"journal\": \"Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vitro and in vivo validation with signaling readouts, single lab\",\n      \"pmids\": [\"26039541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Soluble CD74 (sCD74) co-treatment with MIF induces necroptosis in cardiac myofibroblasts via RIP1/RIP3-dependent mechanism; sCD74 diminishes MIF-mediated AKT activation and triggers p38 activation, rerouting survival signaling to necroptotic cell death specific to cardiac fibroblasts but not cardiomyocytes.\",\n      \"method\": \"Recombinant sCD74 and MIF co-treatment; RIP1/RIP3 inhibition assays; Western blot for AKT and p38 phosphorylation; microarray/RT-qPCR for interferon-induced genes; cell death quantification\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple signaling readouts plus pathway inhibitor rescue, single lab with two orthogonal methods\",\n      \"pmids\": [\"30371153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CD74 signaling in intestinal epithelial cells is necessary for gut repair after colitis: MIF stimulates CD74 receptor, enhancing epithelial cell proliferation through activation of AKT and ERK pathways; CD74 signaling in immune cells was not essential for mucosal healing.\",\n      \"method\": \"CD74-/- mice and bone marrow chimera models; CRISPR/Cas9 CD74 knockout; anti-CD74 neutralizing antibodies; Western blot for phospho-AKT and phospho-ERK; immunohistochemistry; flow cytometry\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus bone marrow chimera plus antibody neutralization plus CRISPR with specific pathway readouts distinguish cell-type-specific requirements\",\n      \"pmids\": [\"32004754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CD74 is expressed on normal colon epithelial cells; MIF stimulation of CD74 induces upregulation of Bcl-2 and increased survival of CEC from WT but not CD74-deficient mice; in CT26 colon carcinoma cells, MIF-CD74 signaling enhances cell survival, AKT phosphorylation, and Bcl-2 expression.\",\n      \"method\": \"RT-PCR, Western blot, FACS for CD74 expression; survival assays with CD74-KO mice CEC; Western blot for phospho-AKT and Bcl-2\",\n      \"journal\": \"World journal of gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CD74-KO comparison with multiple molecular readouts, single lab\",\n      \"pmids\": [\"20614481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The HLA-DRα1 domain directly inhibits binding of MIF to CD74, blocking downstream inflammatory ERK1/2 signaling in the spinal cord in EAE; a single amino acid substitution (L50Q) enhances DRα1 affinity for CD74, increases MIF binding blockade, and improves therapeutic activity, identifying the MIF-binding region on CD74.\",\n      \"method\": \"MIF-CD74 binding competition assay; in vivo EAE mouse model; Western blot for pERK1/2; trypsin digestion functional assay; histological analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding competition assay plus in vivo functional readout with mutagenesis, single lab\",\n      \"pmids\": [\"24683185\", \"30353480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CD74-NRG1 fusion promotes cancer stem cell-like properties via ErbB2/3 phosphorylation, activating PI3K/Akt/NF-κB, which in an NF-κB-dependent manner upregulates IGF2 secretion and IGF1R phosphorylation, establishing an IGF2 autocrine/paracrine circuit; inhibition of ErbB2, PI3K, NF-κB, or IGF2 suppresses tumor sphere formation.\",\n      \"method\": \"Ectopic expression of CD74-NRG1 in lung epithelial cells; Western blot for phospho-ErbB2/3, phospho-Akt, NF-κB; sphere formation assay; limiting dilution xenograft; NF-κB reporter; IGF2/IGF1R ELISA and Western blot; pharmacological inhibition\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple inhibitor experiments and in vivo xenograft with mechanistic pathway dissection, single lab\",\n      \"pmids\": [\"26837769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CD74-NRG1 physically binds ERBB3, and this interaction drives ERBB2:ERBB3 heterodimerization as the mechanistic event in transformation; CD74-NRG1-expressing cells proliferate independent of exogenous NRG1 ligand; transgenic mice ubiquitously expressing CD74-NRG1 develop tumors at high frequency.\",\n      \"method\": \"CD74-NRG1 transgenic mouse model; ERBB3 binding assay; Western blot for phospho-ERBB2/ERBB3; proliferation assays in the absence of NRG1; pharmacological ERBB2/3 inhibition\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo transgenic model with direct physical binding evidence and functional independence from exogenous ligand, multiple orthogonal methods\",\n      \"pmids\": [\"35247925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MIF-CD74 interaction directly regulates PD-L1 expression in melanoma: IFN-γ upregulates CD74 surface expression; blockade of CD74-MIF interaction with 4-IPP inhibitor or siRNA knockdown of MIF or CD74 suppresses PD-L1 expression; constitutive PD-L1 expression in WM1361A melanoma cells is also dependent on MIF-CD74.\",\n      \"method\": \"siRNA knockdown of CD74 and MIF; 4-IPP pharmacological inhibition; Western blot and flow cytometry for PD-L1; immunohistochemistry in patient melanoma tissues\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus pharmacological inhibition with multiple readouts confirming mechanistic link, single lab\",\n      \"pmids\": [\"31069878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CD74 absence in mice leads to accumulation of hematopoietic stem cells (HSCs) in bone marrow due to increased repopulation potential and competition for BM niches; CD74-KO HSCs show increased survival and accumulation of both quiescent and proliferating cells; CD74 regulates CD18 expression on HSCs. In vitro CD74 blockade elevated HSPC numbers.\",\n      \"method\": \"CD74-KO mouse analysis; competitive repopulation assays; BM transplantation; flow cytometry for HSC populations; in vitro HSPC expansion with CD74 blockade\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with competitive repopulation and in vitro validation using multiple orthogonal approaches\",\n      \"pmids\": [\"33661886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CD74 silencing in macrophages diminishes adhesion molecule expression (ALCAM, ICAM4, Syndecan-2), reduces macrophage adhesion to trophoblasts, and shifts macrophage activation toward a pro-inflammatory signature with increased TNF-α, CCL5, and MCP-1 secretion; CD74-KO mice display disturbed placental morphology, reduced junctional zone, impaired spiral artery remodeling, and fetal growth restriction.\",\n      \"method\": \"CD74 siRNA silencing in macrophages; co-culture of macrophages with trophoblasts; flow cytometry and RT-PCR; CD74-KO mouse placental analysis; immunofluorescence\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse model with in vitro siRNA silencing, multiple orthogonal readouts (adhesion, cytokines, placental morphometry)\",\n      \"pmids\": [\"27199465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MIF activates CD74 on atrial cardiomyocytes to increase calcium transients, SR calcium content, NCX efflux, calcium leak, and potassium currents; MIF induces SERCA, NCX, and phosphorylation of RyR2 and activates CaMKII; these electrophysiological effects and CaMKII-RyR2 signaling activation are attenuated by anti-CD74 neutralizing antibody.\",\n      \"method\": \"Patch clamp electrophysiology; confocal fluorescence microscopy for calcium; Western blot for signaling proteins; anti-CD74 neutralizing antibody treatment; electrocardiographic telemetry in MIF-injected mice\",\n      \"journal\": \"Translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patch clamp and calcium imaging with antibody rescue plus in vivo echocardiography, single lab\",\n      \"pmids\": [\"31669150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CD74 ablation protects against LPS-induced cardiac dysfunction through suppression of autophagy via an AMPK-Skp2-SUV39H1-mediated mechanism: CD74-KO reverses LPS-induced Skp2 downregulation and SUV39H1/H3K9 methylation of BCLB; AMPK activator or rapamycin nullifies CD74 KO protection.\",\n      \"method\": \"CD74-KO mouse echocardiography; cardiomyocyte contractile function assay; Western blot for AMPK, mTOR, Skp2, SUV39H1, H3K9 methylation; GFP-LC3B autophagy reporter; pharmacological inhibitors (AICAR, rapamycin, chaetocin)\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with multiple pathway inhibitors defining epistatic order, single lab\",\n      \"pmids\": [\"31877229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TIMP-1 shares CD74-binding residues with MIF and MIF-2 (but not CXCR4-binding residues); TIMP-1 interacts with surface-expressed CD74 causing its internalization, and activates AKT and ERK1/2 phosphorylation in monocytes via CD74; this TIMP-1-CD74 axis promotes monocyte recruitment responses and VSMC proliferation.\",\n      \"method\": \"Sequence alignment and in silico docking; subcellular colocalization; co-immunoprecipitation; internalization assay; phospho-kinase array; AKT/ERK Western blot; Transwell migration and flow adhesion assays; live cell imaging for VSMC proliferation\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical and functional assays in a single study, single lab; structural analysis is in silico\",\n      \"pmids\": [\"37508563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CD74 is upregulated on activated CD4+ T cells post-translationally modified by chondroitin sulfate and traffics to the cell surface; proximity ligation assay demonstrates CD74/CXCR4 heterocomplexes on activated T cells that diminish after MIF treatment, indicating MIF-induced internalization; CD74 and CXCR4 cooperatively mediate MIF-induced T cell migration.\",\n      \"method\": \"Flow cytometry; Western blot; immunohistochemistry; proximity ligation assay; 3D-matrix live cell imaging; receptor pathway-specific inhibitors; re-analysis of RNA-seq and proteomics data\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity ligation assay plus functional migration assays with inhibitors, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"38992165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Genetic deletion of CD74 in human primary Tregs causes major defects in actin cytoskeleton organization and intracellular organelle arrangement; intratumoral CD74-KO Tregs show decreased activation, reduced Foxp3 expression, and impaired accumulation in tumors, leading to accelerated tumor rejection in preclinical models; CD74 effects are tumor-specific and do not affect Treg phenotype or suppressive capacity at steady state.\",\n      \"method\": \"CD74 genetic deletion in human primary Tregs (CRISPR); actin cytoskeleton imaging; flow cytometry for activation markers and Foxp3; intratumoral Treg accumulation assays; preclinical mouse tumor models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human primary Treg genetic deletion with multiple orthogonal cellular readouts and in vivo tumor model validation\",\n      \"pmids\": [\"38702311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"APP on GBM tumor cell surfaces binds the CD74/CXCR4 receptor complex on tumor-associated macrophages, promoting phosphorylation of SHP-1 and thereby inhibiting TAM phagocytosis; disrupting the APP-CD74 axis upregulates TAM phagocytosis in vitro and in vivo.\",\n      \"method\": \"Cell-cell communication analysis (scRNA-seq); co-immunoprecipitation; SHP-1 phosphorylation Western blot; phagocytosis assays in vitro and in vivo\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical binding evidence plus functional phagocytosis assay with in vivo validation, single lab\",\n      \"pmids\": [\"39111632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In triple-negative breast cancer, MIF from tumor cells activates CD74 on dendritic cells, inducing CD74-ICD binding to the SP1 promoter, upregulating SP1, which binds the IL-1β promoter to downregulate IL-1β transcription; reduced IL-1β leads to expansion of tolerogenic DCs and regulatory B cells, suppressing anti-tumor immunity.\",\n      \"method\": \"CD74-KO mice; Cre-flox conditional KO in CD23+ B cells and CD11c+ DCs; CD74 inhibitor (DRQ); ChIP for CD74-ICD binding SP1 promoter; Western blot; flow cytometry for tol-DC and Breg populations; tumor growth assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KOs plus ChIP for promoter binding plus pharmacological inhibition with multiple functional readouts\",\n      \"pmids\": [\"39576827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CD74 functions as a transcriptional factor in ADPKD: CD74 binds promoters of fibrotic markers (collagen I, fibronectin, α-SMA) to upregulate them; CD74 also binds the MIF promoter to form a positive feedback loop where MIF activates CD74 signaling and CD74 increases MIF expression; CD74-KO normalizes ERK, mTOR, and Rb signaling and reduces NF-κB/MCP-1/TNF-α-dependent macrophage recruitment.\",\n      \"method\": \"CD74-KO in Pkd1 mutant mice; ChIP for CD74 binding fibrotic gene promoters and MIF promoter; Western blot for ERK/mTOR/Rb/NF-κB; ELISA for MCP-1/TNF-α; histology for macrophage recruitment and fibrosis; cell proliferation assays\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in disease model plus ChIP for direct promoter binding plus multiple downstream readouts and positive feedback loop validation\",\n      \"pmids\": [\"38534333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CD74 signaling drives inflammation in RUNX1-FPD hematopoietic stem/progenitor cells through activation of mTOR and JAK/STAT pathways with increased cytokine production; genetic and pharmacological CD74 targeting (ISO-1) reverses myeloid-biased differentiation defects and reduces inflammation both in vitro and in vivo.\",\n      \"method\": \"Single-cell RNA sequencing of patient FPD samples; Western blot and phospho-flow for mTOR/JAK/STAT; CD74 genetic targeting; ISO-1 pharmacological inhibition; in vitro and in vivo differentiation assays; cytokine profiling\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — scRNA-seq with functional genetic and pharmacological validation in vitro and in vivo, single lab\",\n      \"pmids\": [\"39772771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Predicted structural modeling of MIF/CD74 interaction reveals 3 binding sites on the MIF homotrimer each engaging one CD74 trimer through two distinct 5-amino-acid determinants, forming a predicted MIF(CD74)3 dodecamer; the same CD74 determinants are used by the competitive inhibitor RTL1000.\",\n      \"method\": \"In silico protein-protein docking of MIF trimer and CD74 trimer; structural modeling of CD74-RTL1000 complex\",\n      \"journal\": \"Metabolic brain disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — purely computational structural prediction without experimental validation\",\n      \"pmids\": [\"26851955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The CD74 p41 splice isoform specifically inhibits cathepsin L (CTSL) activity; in arthritis, the p41 isoform is differentially expressed in severely affected tissue and correlates with TNF expression; M1-like macrophages express higher CD74 and have higher CTSL secretion/activity than M2-like macrophages; RA patients responding to TNF blockade show higher CD74 in circulating monocytes post-treatment.\",\n      \"method\": \"qPCR for CD74 isoforms; CTSL enzymatic activity assay; macrophage polarization in vitro; flow cytometry; collagen-induced arthritis mouse model\",\n      \"journal\": \"Journal of autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic activity assay plus in vitro macrophage polarization plus in vivo correlation, single lab\",\n      \"pmids\": [\"35245865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FTY720 induces lysosomal membrane permeabilization and blocks autophagic-lysosomal degradation, leading to increased CD74 levels; CD74 is normally degraded in the lysosomal compartment.\",\n      \"method\": \"Western blot for CD74, LC3-II, and p62; fluorescence microscopy for autolysosomes; lysosomal hydrolase translocation assay in MCL cell lines\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic link between lysosomal pathway and CD74 levels established via multiple biochemical readouts, single lab\",\n      \"pmids\": [\"22042694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CD74 suppression in lymphoma cells (BJAB, Raji) increases surface Fas receptor expression, enhances caspase-8 and caspase-3 cleavage upon FasL stimulation, and sensitizes cells to Fas-mediated apoptosis and chemotherapy; conversely, full-length CD74 overexpression in livers protects mice from lethal anti-Fas challenge, indicating CD74 interferes with early Fas signaling at the plasma membrane.\",\n      \"method\": \"shRNA-mediated CD74 knockdown; hydrodynamic transfection with full-length CD74 in mice; flow cytometry for Fas surface expression; Western blot for caspase-8/-3 cleavage; FasL challenge survival assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown plus overexpression in vivo with mechanistic signaling readout, single lab\",\n      \"pmids\": [\"25304249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Gastric epithelial cells constitutively express CD74 (invariant chain) mRNA and all protein isoforms; CD74 surface expression is polarized to the apical surface of these non-conventional antigen-presenting cells, as determined by immunohistochemistry on human biopsies and multiple gastric epithelial cell lines.\",\n      \"method\": \"RT-PCR for CD74 mRNA; Western blot for CD74 isoforms; immunohistochemistry and immunofluorescence on human gastric biopsies and cell lines; polarized expression confirmed by confocal imaging\",\n      \"journal\": \"Journal of histochemistry and cytochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — first demonstration of apical polarization using multiple orthogonal methods in human tissue and cell lines, single lab\",\n      \"pmids\": [\"15923369\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CD74 is a type II transmembrane protein that functions as the primary cell-surface receptor for the cytokine MIF (and related ligands MIF-2/D-DT, TIMP-1), forming functional heteromeric complexes with CD44, CXCR4, and CXCR2 to transduce signals via ERK1/2, PI3K-AKT, NF-κB, and p38 pathways; upon MIF binding, CD74 undergoes intramembrane cleavage releasing a cytosolic intracellular domain (CD74-ICD) that acts as a transcriptional co-regulator by interacting with NF-κB, RUNX, and PAX5 to control survival, differentiation, and immune-response gene expression in B cells and other cell types; CD74 also functions as a chaperone mediating MHC class II antigen presentation, is regulated through lysosomal degradation (with lysosomal blockade increasing CD74 levels), controls Fas receptor surface availability to modulate apoptosis sensitivity, and drives disease-relevant processes including B-cell survival, HSC homeostasis, Treg tumor infiltration, osteoclastogenesis, and intestinal epithelial repair.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CD74 is a type II transmembrane protein that serves as the principal cell-surface receptor for the cytokine MIF (and the structurally related ligands MIF-2 and TIMP-1), transducing extracellular signals into proliferative, survival, migratory, and immune-modulatory programs across diverse cell types [#2, #4, #23]. Productive signaling requires CD74 to assemble into heteromeric receptor complexes, most prominently with CXCR4, which co-immunoprecipitates with CD74 from monocytes and is required for MIF-stimulated AKT activation, endosomal trafficking of internalized ligand, ZAP-70 activation, and chemotaxis [#2, #3, #4, #24]. Ligand engagement drives a recurring set of downstream cascades — PI3K/AKT, ERK1/2, p38, and NF-\\u03baB — whose outputs are context-dependent: in B cells and epithelial/tumor cells they promote survival and proliferation through NF-\\u03baB-driven TAp63/BCL-2 and BCL-XL induction [#0, #1, #14], whereas soluble CD74 can reroute MIF signaling toward RIP1/RIP3 necroptosis [#12]. Beyond surface signaling, MIF binding triggers intramembrane cleavage that liberates the CD74 intracellular domain (CD74-ICD), which translocates to the nucleus and functions as a transcriptional regulator: it partners with RUNX and NF-\\u03baB on apoptosis, immune, and migration genes in CLL B cells, forms a cytosolic complex with PAX5 to repress the tumor suppressor DMTF1, and directs SP1-mediated IL-1\\u03b2 repression in dendritic cells [#6, #7, #27]. CD74 also acts as a transcription factor in its own right in polycystic kidney disease, binding fibrotic gene and MIF promoters to establish a feed-forward inflammatory loop [#28]. Through these activities CD74 governs B-cell and HSC homeostasis, regulatory T-cell tumor infiltration, macrophage polarization and phagocytosis, osteoclastogenesis, and intestinal epithelial repair [#4, #9, #13, #19, #25, #26]. A recurrent CD74-NRG1 gene fusion exploits the CD74 transmembrane anchor to display the NRG1 EGF-like domain extracellularly, driving ERBB2:ERBB3 heterodimerization and oncogenic transformation [#5, #17]. CD74 protein levels are set in part by lysosomal degradation [#32].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that CD74 is not merely an MHC class II chaperone but an active surface receptor whose engagement drives B-cell proliferation and survival.\",\n      \"evidence\": \"Anti-CD74 antibody stimulation of B cells with NF-\\u03baB reporter, BrdU, and BCL-XL readouts\",\n      \"pmids\": [\"16484589\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the physiological ligand not addressed in this study\", \"Receptor partners mediating signaling not yet defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the pathway order downstream of CD74, showing NF-\\u03baB induces TAp63 which transactivates BCL-2 to confer the antiapoptotic effect.\",\n      \"evidence\": \"CD74 stimulation in primary B cells with ChIP for TAp63 at the BCL-2 promoter and apoptosis assays\",\n      \"pmids\": [\"17846227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generalizability of the TAp63 axis beyond B cells unknown\", \"Direct CD74-to-NF-\\u03baB coupling mechanism not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved how CD74 transduces signal despite a short cytoplasmic tail by demonstrating a functional CD74/CXCR4 heteromeric receptor complex.\",\n      \"evidence\": \"Reciprocal Co-IP from primary monocytes plus AMD3100/antibody blockade of MIF-induced AKT in transfected cells\",\n      \"pmids\": [\"19665027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural architecture of the complex not determined\", \"Whether all CD74 signaling requires CXCR4 not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed MIF/CD74/CXCR4 signaling occurs from endosomes following clathrin/dynamin-dependent internalization, linking receptor trafficking to signal output.\",\n      \"evidence\": \"Endocytosis inhibitors, CD74 overexpression, CXCR4 blockade, endosomal colocalization, and AKT readout in HEK293/HeLa\",\n      \"pmids\": [\"22014447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor proteins linking CD74 to clathrin machinery unidentified\", \"Fate of internalized receptor (recycling vs degradation) not traced here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated CD74/CXCR4 cooperatively drive MIF-induced chemotaxis via ZAP-70, defining a migratory effector arm.\",\n      \"evidence\": \"Cd74-/- and ZAP-70-/- mouse B cells, Transwell migration, Ca2+ and F-actin assays, siRNA in Ramos cells\",\n      \"pmids\": [\"24760155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling CD74 to ZAP-70 activation unknown\", \"Whether other cell types use this ZAP-70 route untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped the MIF-binding region on CD74 by showing HLA-DR\\u03b11 competitively blocks MIF binding and an L50Q mutation enhances blockade.\",\n      \"evidence\": \"MIF-CD74 binding competition assay, EAE model, pERK1/2 readout, and mutagenesis\",\n      \"pmids\": [\"24683185\", \"30353480\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of the MIF-CD74 interface\", \"Affinity quantification limited\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovered that the cleaved CD74-ICD acts as a nuclear transcriptional regulator, connecting surface engagement to gene-expression control in CLL.\",\n      \"evidence\": \"ChIP-seq for CD74-ICD binding plus Co-IP with RUNX and NF-\\u03baB in CLL cells\",\n      \"pmids\": [\"28031488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease performing intramembrane cleavage not identified\", \"Mechanism of ICD nuclear import unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a CD74-ICD:PAX5 complex repressing the tumor suppressor DMTF1 in normal B cells, a function lost in CLL, extending the transcriptional role of the ICD.\",\n      \"evidence\": \"Co-IP of CD74-ICD with PAX5 and ChIP at the DMTF1 promoter in normal vs CLL B cells\",\n      \"pmids\": [\"36323260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CLL disrupts this repression mechanistically unclear\", \"Direct DNA contact vs PAX5-tethered binding not distinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Expanded CD74-ICD transcriptional control to dendritic cells, where it induces SP1 to repress IL-1\\u03b2 and promote tolerogenic immunity in breast cancer.\",\n      \"evidence\": \"Cell-type-specific conditional KO, ChIP for CD74-ICD at the SP1 promoter, and tol-DC/Breg profiling\",\n      \"pmids\": [\"39576827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ICD-SP1 promoter binding vs co-factor recruitment not fully separated\", \"Translation to human tumors not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed CD74 itself binds gene promoters as a transcription factor in ADPKD, upregulating fibrotic genes and MIF in a feed-forward loop.\",\n      \"evidence\": \"CD74-KO in Pkd1 mutant mice with ChIP at fibrotic and MIF promoters and pathway Western blots\",\n      \"pmids\": [\"38534333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether full-length CD74 or ICD mediates promoter binding ambiguous\", \"Direct DNA-binding domain not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the CD74-NRG1 fusion as an oncogenic driver that displays the NRG1 EGF-like domain to activate ERBB3/PI3K-AKT.\",\n      \"evidence\": \"Transcriptome sequencing, ectopic expression in lung cancer lines, phospho-ERBB3/AKT, and soft-agar assays\",\n      \"pmids\": [\"24469108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo tumorigenicity not yet shown at this stage\", \"Whether endogenous CD74 functions feed into fusion signaling unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Confirmed CD74-NRG1 directly binds ERBB3 to force ERBB2:ERBB3 heterodimerization and drive ligand-independent transformation in vivo.\",\n      \"evidence\": \"CD74-NRG1 transgenic mice, ERBB3 binding assay, and NRG1-independent proliferation\",\n      \"pmids\": [\"35247925\", \"26837769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of the CD74 portion beyond membrane anchoring unclear\", \"Therapeutic vulnerabilities of the fusion in patients not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed that soluble CD74 reroutes MIF signaling from AKT survival to RIP1/RIP3 necroptosis, showing receptor solubility tunes cell-fate output.\",\n      \"evidence\": \"Recombinant sCD74/MIF co-treatment with RIP1/RIP3 inhibition and AKT/p38 readouts in cardiac fibroblasts\",\n      \"pmids\": [\"30371153\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Source and physiological abundance of soluble CD74 unclear\", \"Cell-type specificity mechanism not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Broadened the CD74 ligand repertoire by showing TIMP-1 engages CD74 (sharing MIF-binding residues) to trigger internalization and AKT/ERK signaling.\",\n      \"evidence\": \"In silico docking, Co-IP, internalization, phospho-kinase array, and migration assays in monocytes\",\n      \"pmids\": [\"37508563\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural interface is computational only\", \"Whether TIMP-1 requires CXCR4 not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined a homeostatic role for CD74 in restraining hematopoietic stem cell repopulation and niche competition.\",\n      \"evidence\": \"CD74-KO mice, competitive repopulation, BM transplantation, and in vitro HSPC expansion with CD74 blockade\",\n      \"pmids\": [\"33661886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand driving HSC CD74 signaling not identified\", \"Downstream effectors beyond CD18 regulation unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed CD74 is required for regulatory T-cell cytoskeletal organization and tumor infiltration, marking it as an immune-evasion node.\",\n      \"evidence\": \"CRISPR deletion in human primary Tregs, actin imaging, and preclinical tumor models\",\n      \"pmids\": [\"38702311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from CD74 to actin cytoskeleton unresolved\", \"Tumor-specific (vs steady-state) signaling trigger unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed CD74-ICD-independent surface CD74/CXCR4 complexes mediate MIF-induced T-cell migration and demonstrated chondroitin-sulfate-modified CD74 trafficking.\",\n      \"evidence\": \"Proximity ligation assay, 3D-matrix imaging, and pathway inhibitors in activated CD4+ T cells\",\n      \"pmids\": [\"38992165\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of chondroitin sulfate modification not dissected\", \"Dynamics of complex disassembly upon MIF not quantified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Implicated CD74/CXCR4 on macrophages as a phagocytosis checkpoint engaged by tumor APP via SHP-1.\",\n      \"evidence\": \"scRNA-seq cell-cell analysis, Co-IP, SHP-1 phosphorylation, and phagocytosis assays in GBM\",\n      \"pmids\": [\"39111632\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct APP-CD74 binding affinity not measured\", \"Whether MIF competes with APP at CD74 untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CD74 limits Fas surface availability to set apoptosis sensitivity, a function distinct from its ligand-receptor signaling.\",\n      \"evidence\": \"shRNA knockdown and in vivo full-length CD74 overexpression with Fas surface and caspase readouts\",\n      \"pmids\": [\"25304249\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which CD74 retains Fas intracellularly unknown\", \"Whether ICD or surface CD74 mediates the effect unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked CD74 protein abundance to lysosomal/autophagic degradation, identifying a level-setting mechanism exploitable pharmacologically.\",\n      \"evidence\": \"FTY720-induced lysosomal permeabilization with CD74, LC3-II, p62 Western blots in MCL lines\",\n      \"pmids\": [\"22042694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific lysosomal proteases acting on CD74 not identified\", \"Connection to ICD generation not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Assigned a protease-regulatory activity to the CD74 p41 isoform as a cathepsin L inhibitor relevant to macrophage polarization in arthritis.\",\n      \"evidence\": \"CTSL enzymatic assay, isoform qPCR, macrophage polarization, and collagen-induced arthritis model\",\n      \"pmids\": [\"35245865\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo consequences of CTSL inhibition by p41 not isolated\", \"Relationship to MIF-receptor function unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of MIF/CD74 receptor assembly, the protease responsible for CD74 intramembrane cleavage, and the determinants of context-specific downstream output (survival vs death, transcriptional repression vs activation) remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experimentally determined MIF-CD74 complex structure\", \"Cleavage protease generating CD74-ICD unidentified\", \"Rules governing which cell types use CXCR4, CXCR2, or CD44 co-receptors not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 4, 8, 23]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6, 7, 27, 28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [31, 33]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 8, 11, 34]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 7, 28]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [32]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 8, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 25, 26, 27]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 7, 27, 28]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 17, 28, 29]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 33]}\n    ],\n    \"complexes\": [\n      \"CD74/CXCR4 receptor complex\"\n    ],\n    \"partners\": [\n      \"MIF\",\n      \"CXCR4\",\n      \"TIMP-1\",\n      \"RUNX\",\n      \"NF-kB\",\n      \"PAX5\",\n      \"ERBB3\",\n      \"APP\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}