{"gene":"IL4","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1986,"finding":"Human IL-4 (then called B-cell stimulatory factor 1) was cloned from a concanavalin A-activated T-cell cDNA library. The encoded protein of 153 amino acids stimulates proliferation of human helper T-cell clones and anti-IgM-activated B cells, establishing its dual T-cell and B-cell stimulatory activities.","method":"cDNA cloning from human T-cell library, expression in COS-7 cells, proliferation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — original cloning with functional reconstitution in transfected cells","pmids":["3016727"],"is_preprint":false},{"year":1988,"finding":"IL-4 is required in vivo to generate and sustain IgE responses. Anti-IL-4 monoclonal antibody inhibited primary polyclonal IgE responses by 99% in nematode-infected or anti-IgD-injected mice and accelerated the decline of established IgE responses, demonstrating a non-redundant role for IL-4 in IgE production.","method":"In vivo antibody neutralization, serum IgE ELISA, mouse infection models","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — clean in vivo loss-of-function with defined immunological phenotype, replicated across multiple immunization models","pmids":["2459206"],"is_preprint":false},{"year":1988,"finding":"IL-4 directly induces differentiation of human precursor and pre-B cells into cytoplasmic µ- and surface IgM-positive cells without requiring cell proliferation, demonstrating a direct differentiation-promoting activity on early B-cell precursors.","method":"In vitro bone marrow culture, flow cytometry for cytoplasmic µ and surface IgM","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vitro differentiation assay on primary human cells, single lab","pmids":["3260922"],"is_preprint":false},{"year":1988,"finding":"IL-4 modulates human peripheral blood monocyte phenotype and function: it induces upregulation of MHC class II antigens, C3bi receptor, and p150.95, while inhibiting secretion of IL-1, cytostatic, and chemotactic compounds, suggesting IL-4 drives monocyte-to-macrophage differentiation and suppresses pro-inflammatory outputs.","method":"Primary monocyte culture, flow cytometry, functional cytostasis and chemotaxis assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal functional readouts on primary human cells, single lab","pmids":["3279117"],"is_preprint":false},{"year":1990,"finding":"IL-4 acts directly on human vascular endothelial cells to increase their adhesiveness for T cells but not neutrophils, an effect blocked by anti-IL-4 but not anti-TNF antibodies, and mediated by generation of an alternative binding receptor distinct from ICAM-1/LFA-1.","method":"Endothelial cell adhesion assays, antibody blocking, T cell/neutrophil differential adhesion measurements","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assay on primary ECs with blocking antibody controls; single lab","pmids":["1969883"],"is_preprint":false},{"year":1991,"finding":"IL-4 plus hydrocortisone induces IgE isotype switching in normal purified peripheral blood B cells independent of T cells or monocytes; endogenous IL-6 was identified as a critical co-factor, as anti-IL-6 antibody strongly inhibited IgE production.","method":"Purified B cell culture, ELISA for IgE, antibody blocking, cell sorting","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — direct B-cell assay with multiple cytokine-blocking controls; single lab","pmids":["1715363"],"is_preprint":false},{"year":1992,"finding":"IL-4 enhances programmed cell death (apoptosis) in IL-1- or LPS-stimulated human monocytes but not in unstimulated cells, producing classic oligonucleosome-sized DNA laddering; this effect was antagonized by IFN-γ and was unique among tested cytokines.","method":"Monocyte viability assays, DNA ladder gel electrophoresis, cytokine competition experiments","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — direct mechanistic demonstration of apoptosis with molecular readout and cytokine specificity controls","pmids":["1541822"],"is_preprint":false},{"year":1993,"finding":"Genetic disruption of the murine IL-4 gene (IL-4−/− mice) abolished Th2 cytokine responses (IL-5, IL-9, IL-10) and reduced helminth-induced eosinophilia, establishing IL-4 as required for generation of the Th2-derived cytokine program in vivo.","method":"Gene targeting/knockout mice, T-cell stimulation assays, cytokine ELISA, eosinophil counts after nematode infection","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1/2 — genetic loss-of-function with multiple in vivo phenotypic readouts; highly replicated foundational study","pmids":["8384701"],"is_preprint":false},{"year":1993,"finding":"IL-4 rapidly activates a tyrosine-phosphorylated DNA-binding factor (IL-4 NAF, later named STAT6) within minutes, which binds specific DNA sequences in IL-4-responsive gene promoters; activation required tyrosine phosphorylation as demonstrated by anti-phosphotyrosine antibody recognition of the NAF-DNA complex.","method":"EMSA, anti-phosphotyrosine antibody supershift, kinetics of nuclear factor activation","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — direct biochemical demonstration of tyrosine phosphorylation-dependent transcription factor activation; replicated by STAT6 cloning studies","pmids":["7694370"],"is_preprint":false},{"year":1993,"finding":"The IL-2 receptor γ chain (γc) is a functional component of the IL-4 receptor: chemical cross-linking and γc augmentation of IL-4 binding affinity were demonstrated, and γc was required for IL-4-mediated phosphorylation of insulin receptor substrate-1 (IRS-1/4PS).","method":"Chemical cross-linking, binding affinity measurements, IRS-1 phosphorylation assays","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biochemical methods establishing γc as IL-4R component; foundational study replicated widely","pmids":["8266078"],"is_preprint":false},{"year":1994,"finding":"IL-4 Stat (STAT6) was purified to homogeneity, cloned, and characterized as a member of the STAT family. Phosphotyrosine-containing peptides from the intracellular domain of the IL-4 receptor inhibited IL-4 Stat activation, providing evidence for direct receptor–transcription factor coupling; the same domain mediates both receptor coupling and dimerization.","method":"Protein purification, peptide inhibition, cDNA cloning, sequence analysis","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — protein purification, cloning, and mechanistic peptide-inhibition experiments; foundational STAT6 identification paper","pmids":["8085155"],"is_preprint":false},{"year":1995,"finding":"STAT6 (IL-4 Stat) is rapidly tyrosine-phosphorylated in response to IL-4 and IL-3, but not IL-2, IL-12, or erythropoietin; inducible tyrosine phosphorylation of STAT6 requires the membrane-distal region of the IL-4 receptor α chain, which is not required for mitogenesis—thus STAT6 activation is dissociated from proliferative signaling.","method":"STAT6-specific antiserum immunoprecipitation, cytokine stimulation panel, IL-4Rα truncation mutants","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — receptor mutant dissection with immunoprecipitation; mechanistic identification of STAT6 phosphorylation site requirements","pmids":["7760829"],"is_preprint":false},{"year":1996,"finding":"STAT6-deficient mice generated by gene targeting lack IL-4-induced upregulation of MHC class II and IL-4 receptor on B cells, fail to proliferate in response to IL-4, do not produce IgE after immunization, and fail to differentiate into Th2 cells in response to IL-4 or IL-13—establishing STAT6 as essential for mediating IL-4 biological responses despite the existence of other IL-4-activated pathways.","method":"Gene targeting, B-cell proliferation assays, FACS for surface markers, IgE ELISA, Th2 differentiation assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1/2 — genetic knockout with multiple orthogonal readouts across cell types; confirmed by independent lab (PMID 8602263)","pmids":["8624821","8602263"],"is_preprint":false},{"year":1997,"finding":"p110δ, a novel class I PI3K exclusively expressed in leukocytes, associates with p85 adaptor proteins and is similarly recruited to activated signaling complexes after treatment with IL-4 (and IL-3/SCF), placing PI3K signaling in the IL-4 receptor pathway.","method":"cDNA cloning, immunoprecipitation, kinase assays, cytokine stimulation in leukocyte cell lines","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical demonstration of IL-4-induced p110δ recruitment; single paper but with multiple assays","pmids":["9113989"],"is_preprint":false},{"year":1998,"finding":"IL-4 induces eotaxin production in dermal fibroblasts: a single 13-kDa eosinophil-selective chemotaxin (eotaxin) was purified and identified biochemically; IL-4 dose- and time-dependently induced eotaxin mRNA, and synergy with TNF-α produced a 10–20-fold increase in eotaxin release—providing a mechanistic basis for eosinophil recruitment in IL-4-mediated skin reactions.","method":"HPLC purification, SDS-PAGE, peptide mapping/sequencing, RT-PCR, chemotaxis assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 — protein purification to homogeneity with sequence identification, confirmed by mRNA induction; single paper but multiple orthogonal methods","pmids":["9551956"],"is_preprint":false},{"year":1998,"finding":"GATA-3 acts through GATA binding sites in genomic regions surrounding the IL-4 locus as a permissive but not sufficient enhancer of IL-4 transcription in Th2 cells; retroviral GATA-3 transduction induced IL-5 to full Th2 levels but only partially restored IL-4 production, indicating additional factors are required.","method":"Reporter gene assays, EMSA for GATA binding, retroviral transduction of T cells, transgenic mouse analysis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA and retroviral transduction with quantitative cytokine readouts; single lab","pmids":["9780146"],"is_preprint":false},{"year":1998,"finding":"IL-4 requires STAT6 and IL-4Rα to exacerbate anaphylaxis; pretreatment with IL-4 dramatically increased severity of anaphylaxis induced by FcεRI or FcγRIII crosslinking. The mechanism involves IL-4 acting synergistically with vasoactive mediators to increase vascular permeability, independently of T cells, B cells, and common γ-chain, but requiring IL-4Rα and Stat6.","method":"In vivo mouse anaphylaxis models, genetic knockout mice (STAT6−/−, IL-4Rα−/−), vascular permeability assays, cytokine pretreatment experiments","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models with defined mechanistic pathway; replicated across two receptor-crosslinking systems","pmids":["12646651"],"is_preprint":false},{"year":2000,"finding":"A conserved noncoding element (CNS-1) located ~650 bp upstream of the IL-4 promoter was identified as a coordinate cis-regulatory element governing co-expression of IL-4, IL-13, and IL-5 across 120 kb; YAC transgenic mice showed this element is required for full Th2-specific expression of all three cytokines.","method":"Cross-species sequence conservation analysis, YAC transgenic mice, reporter gene assays","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — in vivo transgenic validation of regulatory element; foundational locus-control region identification","pmids":["10753117"],"is_preprint":false},{"year":2000,"finding":"An intronic transcriptional enhancer element in intron 2 of the murine IL-4 gene maintains locus accessibility in mast cells through GATA-1/2, PU.1, and STAT5a/STAT5b binding; deletion of this element or mutation of the GATA site in a stably integrated IL-4 genomic construct prevents maintenance of a demethylated IL-4 locus, indicating a role analogous to Ig/TCR intron regulatory elements.","method":"DNase I footprinting, mutational analysis, stable genomic integration, methylation analysis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 — reconstituted chromatin/methylation assay with mutagenesis; single paper but rigorous mechanistic design","pmids":["10975840"],"is_preprint":false},{"year":2000,"finding":"IL-4 increases FasL expression on CD4+ and CD8+ T cells in vivo, shifting CTL killing from a dominant perforin-mediated pathway to a dominant Ca2+-independent Fas/FasL pathway, as demonstrated by recombinant vaccinia virus coexpressing antigen and IL-4.","method":"Recombinant vaccinia virus expression, EGTA/Mg2+ chelation to dissect killing pathways, flow cytometry for FasL, cytotoxicity assays with Fas+/− targets","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic dissection using Fas-deficient targets and Ca2+ chelation; single lab","pmids":["10725701"],"is_preprint":false},{"year":2000,"finding":"IL-4 expression in Clara cells of transgenic mice drives IL-4-dependent increases in surfactant phosphatidylcholine synthesis and clearance, and selectively induces SP-D mRNA ~2.8-fold and protein ~90-fold, establishing a previously unrecognized IL-4 role in pulmonary surfactant homeostasis.","method":"Transgenic mouse lung analysis, radiolabeled lipid incorporation, Northern/Western blot for surfactant proteins","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic gain-of-function with metabolic labeling; single lab","pmids":["10645893"],"is_preprint":false},{"year":2004,"finding":"IL-4 probabilistically regulates IL-4 production at the single-cell level through stochastic opening of a chromatin site (VA, 5 kb 3′ of exon 4); this opening requires calcineurin/NFAT (blocked by cyclosporin A) and an additional cycloheximide-sensitive factor; producers and nonproducers have similar GATA-3/c-maf levels and similar accessibility at other IL-4 locus sites.","method":"Restriction enzyme accessibility (REA) assay, cyclosporin A treatment, cycloheximide treatment, single-cell cytokine capture","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 — direct chromatin accessibility assay with pharmacological dissection of required factors; mechanistically defines stochastic regulation","pmids":["14975241"],"is_preprint":false},{"year":2006,"finding":"IL-4 induces TARC/CCL17 expression in human T cells via two STAT6 binding sites in the CCL17 promoter; EMSA and chromatin immunoprecipitation confirmed direct STAT6 binding; mutation of both sites completely abolished IL-4 inducibility in reporter assays, establishing a STAT6-dependent direct transcriptional mechanism.","method":"ChIP, EMSA, promoter reporter assays, STAT6-deficient cell line reconstitution","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — ChIP + EMSA + mutagenesis with reporter reconstitution in STAT6-null cells; rigorous mechanistic dissection","pmids":["16810739"],"is_preprint":false},{"year":2006,"finding":"IL-4, acting through the type 1 IL-4R (IL-4Rα/γc) and requiring STAT6, induces IFN-γ production by NK and NKT cells in vivo within 2–4 hours; IL-13, which signals only through the type 2 IL-4R (IL-4Rα/IL-13Rα1), fails to stimulate IFN-γ and even suppresses basal IFN-γ production—establishing distinct functional outcomes of type 1 vs type 2 IL-4R signaling.","method":"In vivo cytokine capture assay, anti-IL-2Rβ NK depletion, Rag2/γc double KO mice, STAT4 KO mice, STAT6 KO mice, cytokine neutralization","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological models; mechanistic dissection of type 1 vs type 2 receptor outcomes","pmids":["16621996"],"is_preprint":false},{"year":2007,"finding":"TSLP drives Th2 differentiation independently of exogenous IL-4 by directly inducing IL-4 gene transcription in CD4+ T cells; this process requires STAT6 and is independent of IL-2, establishing a TSLP→IL-4→STAT6 positive-feedback pathway.","method":"In vitro Th2 differentiation with anti-IL-4 blocking, STAT6 KO T cells, IL-4 mRNA kinetics by RT-PCR","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — blocking antibody and STAT6-KO genetic dissection; single lab","pmids":["17237387"],"is_preprint":false},{"year":2008,"finding":"Crystal structures of the complete type I (IL-4Rα/γc/IL-4) and type II (IL-4Rα/IL-13Rα1/IL-4 and IL-4Rα/IL-13Rα1/IL-13) ternary signaling complexes revealed: (1) structural basis for γc recognition of six different γc-cytokines; (2) IL-13Rα1 uses an unusual top-mounted Ig-like domain for cytokine engagement; (3) reversed assembly sequences for type I vs type II complexes mediated by different recognition chemistries; (4) the type II heterodimer signals with different potencies for IL-4 vs IL-13, with extracellular interactions modulating intracellular membrane-proximal signaling.","method":"X-ray crystallography of ternary complexes, cell-based signaling potency assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — crystal structures of all three receptor complexes with functional validation; foundational structural study","pmids":["18243101"],"is_preprint":false},{"year":2011,"finding":"Alternative (M2) macrophage activation by IL-4 requires STAT6-dependent degradation of SHIP; IL-4-treated macrophages show decreased SHIP protein levels dependent on PI3K activity (specifically class IA PI3Kp110δ isoform); reducing SHIP enhanced, while SHIP overexpression reduced, IL-4-induced arginase I activity—identifying SHIP as a PI3K-regulated negative regulator of IL-4-driven M2 polarization.","method":"SHIP KO macrophages, PI3K inhibitors, SHIP siRNA knockdown, SHIP overexpression, arginase activity assays, STAT6 KO cells","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological dissections with defined enzymatic readout; mechanistically rigorous","pmids":["21469115"],"is_preprint":false},{"year":2011,"finding":"Direct IL-4Rα stimulation of smooth muscle is sufficient (but not necessary) to induce airway hyperresponsiveness (AHR); transgenic mice in which smooth muscle is the only cell expressing or lacking IL-4Rα demonstrated that IL-4, IL-13, or allergen acting on smooth muscle alone activates five genes promoting smooth muscle migration, proliferation, and contractility.","method":"Cell-type-specific IL-4Rα transgenic and conditional knockout mice, methacholine challenge (AHR measurement), gene expression profiling","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific genetic rescue and deletion with defined physiological readout","pmids":["21464224"],"is_preprint":false},{"year":2012,"finding":"IL-4 inhibits melanogenesis in normal human melanocytes via the JAK2-STAT6 signaling pathway: IL-4 treatment increased STAT3 and STAT6 phosphorylation; the JAK2 inhibitor AG490 or STAT6 siRNA blocked IL-4-induced downregulation of MITF and dopachrome tautomerase expression.","method":"Primary human melanocyte culture, Western blot for STAT phosphorylation, RT-PCR, JAK2 inhibitor, STAT6 siRNA knockdown","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological and siRNA dissection with molecular readouts; single lab","pmids":["22992805"],"is_preprint":false},{"year":2013,"finding":"IL-4 derived from eosinophils stimulates hepatocyte proliferation via IL-4Rα on hepatocytes to promote liver regeneration after partial hepatectomy and toxin-mediated injury; macrophage IL-4Rα signaling was found dispensable, establishing direct IL-4→hepatocyte IL-4Rα→proliferation as the operative pathway.","method":"Partial hepatectomy and toxin injury models, eosinophil-deficient mice, macrophage-specific and hepatocyte-specific IL-4Rα conditional knockouts, BrdU incorporation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional knockouts identifying the required cellular target; multiple injury models","pmids":["23716700"],"is_preprint":false},{"year":2013,"finding":"IL-4 converts tissue-resident macrophages from a CSF-1-dependent to a CSF-1-independent proliferation program via macrophage-intrinsic IL-4Rα signaling; IL-4Rα expression confers a competitive advantage with higher and more sustained proliferation; unlike CSF-1, the IL-4 pathway expands resident macrophage density without triggering monocyte or neutrophil recruitment.","method":"Nematode infection models, macrophage-specific IL-4Rα conditional knockout mice, mixed bone marrow chimeras, BrdU/Ki67 proliferation assays, competitive reconstitution","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — cell-intrinsic conditional knockout with competitive chimera experiments; mechanistically resolved CSF-1 vs IL-4 pathways","pmids":["24101381"],"is_preprint":false},{"year":2013,"finding":"Shp1 (PTPN6) negatively regulates IL-4 signaling in T cells: T cell-specific Shp1 deletion leads to sustained STAT6 activation after IL-4 stimulation, skewing toward Th2 lineage and elevated serum IgE; IL-4 blockade or genetic IL-4 deletion in Shp1-deficient mice abolished the CD44hi memory T-cell phenotype, placing Shp1 as a negative regulator of IL-4/STAT6 signaling.","method":"T cell-specific Cre/lox Shp1 deletion, Shp1fl/fl IL-4−/− double KO, STAT6 phosphorylation kinetics, flow cytometry, serum IgE ELISA","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — cell-intrinsic conditional deletion and genetic epistasis with double KO; multiple orthogonal readouts","pmids":["23797092"],"is_preprint":false},{"year":2014,"finding":"STUB1 (CHIP E3 ubiquitin ligase) interacts with IL-4Rα and targets it for ubiquitination-mediated proteasomal degradation, thereby terminating IL-4/IL-13 signaling; STUB1 knockout cells show increased IL-4Rα levels and sustained STAT6 activation; STUB1 overexpression reduced IL-4Rα levels; STUB1-deficient mice develop spontaneous airway inflammation and elevated IgE.","method":"Co-immunoprecipitation, ubiquitination assay, flow cytometry, STUB1 KO mice, STUB1 overexpression","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ubiquitination assay, gain/loss-of-function, and in vivo KO phenotype; multiple orthogonal methods","pmids":["24251647"],"is_preprint":false},{"year":2014,"finding":"IL-4 suppresses NLRP3 inflammasome activation in macrophages via a transcription-independent mechanism: IL-4 inhibits NLRP3-dependent ASC oligomerization, NLRP3-ASC interaction, and speck formation, and blocks subcellular redistribution of NLRP3 into mitochondria and microtubule polymerization; this suppression is STAT6-independent and mitochondrial ROS-independent.","method":"NLRP3 inflammasome reconstitution in macrophages, ASC oligomerization assay, NLRP3-ASC co-IP, immunofluorescence for NLRP3 localization, STAT6 KO cells, microtubule inhibitors","journal":"Immunology and cell biology","confidence":"High","confidence_rationale":"Tier 1/2 — reconstituted NLRP3 system with multiple biochemical assays and genetic/pharmacological controls","pmids":["25601272"],"is_preprint":false},{"year":2014,"finding":"Eosinophil-derived IL-4 and alternatively activated macrophages constitute an efferent circuit for cold-induced beige fat biogenesis: genetic loss of eosinophils or IL-4/IL-13 signaling impairs cold-induced beige fat development; mechanistically, macrophages recruited to cold-stressed white adipose tissue undergo alternative activation to upregulate tyrosine hydroxylase and produce catecholamines required for tissue browning.","method":"Eosinophil-deficient mice, IL-4/13 signal-deficient mice, cold exposure, UCP1 expression, macrophage adoptive transfer, tyrosine hydroxylase expression/catecholamine measurements","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models with mechanistic dissection of catecholamine synthesis pathway; highly cited","pmids":["24906148"],"is_preprint":false},{"year":2015,"finding":"Batf, in cooperation with IRF4, STAT3, and STAT6, drives IL-4 production specifically in T follicular helper (Tfh) cells by directly binding and activating the CNS2 region of the IL-4 locus; Batf deficiency impairs IL-4-producing Tfh cells without affecting canonical Th2 cells; Batf-to-c-Maf signaling is also required for Tfh IL-4 expression.","method":"ChIP, Batf conditional knockout mice, Tfh adoptive transfer, cytokine ELISA, asthma model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP-confirmed direct binding at IL-4 CNS2 combined with in vivo Batf KO; mechanistically resolves Tfh vs Th2 IL-4 regulation","pmids":["26278622"],"is_preprint":false},{"year":2015,"finding":"T cell-derived IL-4 protects and promotes recovery of injured neurons by activating neuronal IL-4 receptors, which potentiate neurotrophin signaling via the AKT and MAPK pathways; neuronal deletion of IL-4R abrogated IL-4-mediated functional recovery in CNS injury models.","method":"Two murine CNS injury models, neuronal IL-4R conditional deletion, wild-type vs IL-4 KO T-cell transfer, neuron culture + IL-4 treatment, AKT/MAPK pathway analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — conditional neuronal IL-4R deletion and T-cell transfer experiments with pathway-level mechanistic data","pmids":["25607842"],"is_preprint":false},{"year":2017,"finding":"Eosinophil-derived IL-4 drives progression of autoimmune myocarditis to inflammatory dilated cardiomyopathy (DCMi); IL-4−/− mice are protected from DCMi like eosinophil-deficient mice; eosinophil-specific IL-4 deletion recapitulated this protection, establishing eosinophil-derived IL-4 as the mechanistic driver of cardiac fibrotic remodeling.","method":"Experimental autoimmune myocarditis model, IL-4 KO, eosinophil-deficient ΔdblGATA1 mice, IL-5Tg hypereosinophilic mice, eosinophil-specific IL-4 conditional deletion, echocardiography","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models including eosinophil-specific conditional deletion; convergent evidence across models","pmids":["28302646"],"is_preprint":false},{"year":2017,"finding":"SUMOylation of KLF4 is induced by IL-4 treatment in macrophages and is required for IL-4-driven M2 polarization; SUMOylation-defective KLF4 failed to promote M2 markers in RAW264.7 cells and BMDMs, identifying KLF4 SUMOylation as a post-translational mechanism downstream of IL-4 signaling.","method":"SUMOylation assays, KLF4 mutant overexpression, BMDMs and RAW264.7 macrophage polarization assays, flow cytometry","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 3 — single lab with SUMOylation assay and functional KLF4 mutant; moderate evidence","pmids":["28059602"],"is_preprint":false},{"year":2018,"finding":"IL-4 exerts direct neuronal signaling via the IRS1-PI3K-PKC pathway to promote cytoskeletal remodeling and axonal repair; intrathecal IL-4 reversed disease progression in chronic EAE without affecting inflammation; neuronal deletion of IL-4R abolished the benefit, and nasal delivery was equally effective.","method":"Multiple EAE models, neuronal IL-4R conditional deletion, intrathecal/nasal IL-4 administration, IRS1-PI3K-PKC pathway analysis, cytoskeletal readouts","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 — conditional neuronal IL-4R deletion with pathway-level mechanistic characterization; multiple EAE models","pmids":["29491183"],"is_preprint":false},{"year":2018,"finding":"IVIG induces IL-4 secretion in human basophils by interacting with basophil surface-bound IgE via F(ab')2 fragments through the spleen tyrosine kinase (Syk) pathway; this effect is independent of FcγRII, type II Fc receptors, C-type lectin receptors, and sialic acid-binding immunoglobulin-like lectins.","method":"Basophil isolation, Syk pathway inhibitors, blocking antibodies for multiple Fc/lectin receptors, IVIG fragment (F(ab')2 vs Fc) experiments, CD69/cytokine ELISA","journal":"The Journal of allergy and clinical immunology","confidence":"Medium","confidence_rationale":"Tier 2 — systematic receptor exclusion with functional fragments and pathway inhibitors; single lab","pmids":["30529242"],"is_preprint":false},{"year":2019,"finding":"NKT2 cells in the thymic medulla require continuous TCR stimulation for constitutive IL-4 production; hematopoietic (not stromal) APCs provide this signal; macrophages are the predominant APCs stimulating NKT2 IL-4 production, as demonstrated by CD1d cell-specific deletion and diphtheria toxin-mediated depletion of specific APC populations.","method":"Intrathymic transfer into CD1d-deficient hosts, bone marrow chimeras, APC-specific Cre CD1d deletion, DTR-mediated depletion, histocytometry","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific genetic and depletion strategies converging on macrophage-NKT2 IL-4 axis","pmids":["31611396"],"is_preprint":false},{"year":2021,"finding":"Wnt signaling potentiates IL-4 responsiveness in macrophages via a PGE2/STAT3 axis during atherosclerosis resolution; IL-4-deficient mice show impaired resolution; Wnt pathway activation enhances expression of inflammation-resolving factors after low-concentration IL-4 treatment, mechanistically linking Wnt and IL-4/STAT6 pathways.","method":"Il4 KO mice atherosclerosis resolution model, Wnt pathway modulation, PGE2/STAT3 pathway inhibition, macrophage gene expression","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with pharmacological dissection of Wnt-PGE2-STAT3 axis; single lab","pmids":["33720008"],"is_preprint":false},{"year":2023,"finding":"IL-4 derived from bone marrow basophils and eosinophils acts on granulocyte-monocyte progenitors via IL-4Rα to transcriptionally programme immunosuppressive tumour-promoting myeloid cells; only deletion of IL-4Rα in early myeloid progenitors (not mature myeloid cells) reduced tumour burden, establishing a bone marrow–level IL-4 signalling axis in cancer immunosuppression.","method":"Single-cell RNA sequencing, panel of conditional IL-4Rα knockout mice (progenitor-specific vs mature myeloid), basophil depletion, clinical trial with IL-4Rα blocking antibody dupilumab","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — cell-stage-specific conditional KO panel with scRNA-seq mechanistic data; translated to clinical observation","pmids":["38057662"],"is_preprint":false},{"year":2024,"finding":"Ovarian cancer cells are a key source of IL-4 that drives formation of an immunosuppressive TME via macrophage control; IL-4 loss from cancer clones creates short-range immune-excluded niches not compensated by neighboring IL-4-expressing clones, revealing localized paracrine regulation of TME composition and immunotherapy resistance.","method":"Perturb-map spatial functional genomics screen, IL-4 knockout in tumor clones, anti-PD-1 treatment, TME macrophage characterization","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — spatial functional screen with genetic IL-4 loss and in vivo tumor immune phenotyping; single paper but rigorous methodology","pmids":["39481380"],"is_preprint":false}],"current_model":"IL-4 is a four-α-helical type I cytokine that signals through type I (IL-4Rα/γc) and type II (IL-4Rα/IL-13Rα1) receptor complexes whose ternary structures are resolved crystallographically; ligand binding activates JAK1/JAK3 (type I) or JAK1/TYK2 (type II), leading to STAT6 tyrosine phosphorylation, dimerization, and nuclear translocation to drive Th2 differentiation, IgE class switching, M2 macrophage polarization, and regulation of tissue homeostasis—with negative feedback provided by STUB1-mediated ubiquitination/proteasomal degradation of IL-4Rα and Shp1/SHIP phosphatase activity—while additional context-specific pathways include IRS1-PI3K-PKC (neuronal repair), AKT/MAPK (neurotrophin potentiation), and transcription-independent suppression of NLRP3 inflammasome assembly."},"narrative":{"teleology":[{"year":1986,"claim":"Cloning of human IL-4 established its identity as a dual T-cell and B-cell growth factor, resolving the molecular basis of 'B-cell stimulatory factor 1' activity.","evidence":"cDNA cloning from ConA-activated T-cell library, COS-7 expression, proliferation assays on T-cell clones and anti-IgM-activated B cells","pmids":["3016727"],"confidence":"High","gaps":["Receptor identity unknown","Signaling pathway undetermined","In vivo requirement not yet tested"]},{"year":1988,"claim":"In vivo antibody neutralization and in vitro differentiation assays demonstrated that IL-4 is non-redundantly required for IgE production and directly promotes B-cell differentiation, establishing its central role in humoral type 2 immunity.","evidence":"Anti-IL-4 mAb in nematode-infected and anti-IgD-injected mice (99% IgE inhibition); purified B-cell differentiation assays","pmids":["2459206","3260922"],"confidence":"High","gaps":["Molecular mechanism of isotype switching not resolved","Intracellular signaling pathway unknown"]},{"year":1988,"claim":"IL-4 was shown to modulate monocyte/macrophage phenotype—upregulating MHC class II while suppressing pro-inflammatory mediators—and to selectively increase endothelial adhesiveness for T cells, extending its functional scope beyond lymphocytes.","evidence":"Primary monocyte culture with flow cytometry and functional assays; endothelial adhesion assays with blocking antibodies","pmids":["3279117","1969883"],"confidence":"Medium","gaps":["Monocyte signaling pathway uncharacterized","Identity of the T-cell-selective endothelial adhesion receptor unknown"]},{"year":1993,"claim":"IL-4 gene knockout mice and identification of STAT6 (IL-4 NAF) as a rapidly tyrosine-phosphorylated transcription factor resolved the non-redundant in vivo requirement for IL-4 in Th2 commitment and linked receptor engagement to a defined transcriptional mechanism.","evidence":"IL-4−/− mice with abolished Th2 cytokine program; EMSA/anti-phosphotyrosine supershift identifying STAT6 DNA-binding complex; γc cross-linking and IRS-1 phosphorylation","pmids":["8384701","7694370","8266078"],"confidence":"High","gaps":["STAT6 gene not yet cloned","Relative contributions of STAT6 vs IRS pathways to different IL-4 responses unclear"]},{"year":1994,"claim":"Purification, cloning, and peptide-inhibition studies of STAT6 defined the direct receptor–transcription factor coupling mechanism, showing that phosphotyrosine motifs on IL-4Rα recruit and activate STAT6.","evidence":"Protein purification to homogeneity, cDNA cloning, phosphotyrosine peptide competition","pmids":["8085155"],"confidence":"High","gaps":["Crystal structure of receptor–STAT6 interaction unavailable","Role of STAT6 dimerization in target gene selectivity unknown"]},{"year":1996,"claim":"STAT6 knockout mice demonstrated that virtually all canonical IL-4 biological responses—B-cell proliferation, MHC II upregulation, IgE production, Th2 differentiation—require STAT6, even though IL-4 activates other pathways.","evidence":"STAT6−/− mice with complete loss of IL-4-driven B-cell and T-cell responses; independently confirmed by two labs","pmids":["8624821","8602263"],"confidence":"High","gaps":["STAT6-independent IL-4 functions not yet catalogued","Tissue-specific IL-4 responses (e.g., neuronal, metabolic) not examined"]},{"year":2000,"claim":"Identification of cis-regulatory elements controlling IL-4 gene expression—the CNS-1 locus control region and an intronic enhancer maintained by GATA/STAT5—revealed how coordinated Th2 cytokine gene expression is epigenetically regulated.","evidence":"YAC transgenic mice for CNS-1; DNase footprinting and methylation analysis for intronic enhancer with GATA/PU.1/STAT5 binding","pmids":["10753117","10975840"],"confidence":"High","gaps":["Three-dimensional chromatin architecture of IL-4/IL-13/IL-5 locus not resolved","Cell-type-specific enhancer usage (mast cell vs Th2 vs Tfh) incompletely defined"]},{"year":2004,"claim":"Stochastic chromatin remodeling at a specific site (VA) in the IL-4 locus, requiring calcineurin/NFAT and an additional protein synthesis-dependent factor, explained the probabilistic nature of IL-4 expression at the single-cell level.","evidence":"Restriction enzyme accessibility assay with cyclosporin A and cycloheximide; single-cell cytokine capture","pmids":["14975241"],"confidence":"High","gaps":["Identity of the cycloheximide-sensitive factor unknown","Relationship between VA accessibility and in vivo Th2 commitment kinetics unclear"]},{"year":2008,"claim":"Crystal structures of all three IL-4 receptor ternary complexes (type I and type II with IL-4; type II with IL-13) provided the structural basis for shared and divergent signaling through γc vs IL-13Rα1, explaining differential potency and cell-type specificity.","evidence":"X-ray crystallography of IL-4Rα/γc/IL-4, IL-4Rα/IL-13Rα1/IL-4, and IL-4Rα/IL-13Rα1/IL-13 complexes with cell-based signaling assays","pmids":["18243101"],"confidence":"High","gaps":["No structure of full-length receptor with intracellular domains and associated JAKs","Mechanism of differential JAK activation (JAK3 vs TYK2) at the structural level unresolved"]},{"year":2013,"claim":"Conditional knockout studies revealed that IL-4 promotes tissue repair by directly acting on non-immune cells—hepatocytes for liver regeneration and resident macrophages for self-renewal—expanding its functional scope beyond classical immune regulation.","evidence":"Hepatocyte- and macrophage-specific IL-4Rα conditional knockouts in hepatectomy, toxin injury, and nematode infection models; BrdU/Ki67 proliferation assays","pmids":["23716700","24101381"],"confidence":"High","gaps":["Intracellular pathway mediating hepatocyte proliferation not fully characterized","Whether IL-4-driven macrophage self-renewal contributes to tissue fibrosis in chronic settings unclear"]},{"year":2014,"claim":"Mechanistic studies of negative regulation identified STUB1-mediated ubiquitination/degradation of IL-4Rα and Shp1-mediated STAT6 dephosphorylation as feedback mechanisms, while a transcription-independent pathway was shown to suppress NLRP3 inflammasome assembly by blocking ASC oligomerization and NLRP3 mitochondrial redistribution.","evidence":"STUB1 KO mice with elevated IL-4Rα and spontaneous airway inflammation; T cell-specific Shp1 deletion with sustained STAT6; NLRP3 reconstitution with ASC oligomerization assay in STAT6 KO cells","pmids":["24251647","23797092","25601272"],"confidence":"High","gaps":["STAT6-independent mechanism of NLRP3 suppression not molecularly identified","Relative contributions of STUB1 vs lysosomal IL-4Rα degradation in different cell types unknown"]},{"year":2015,"claim":"IL-4 was established as a neuroprotective and neuroregenerative cytokine: neuronal IL-4Rα signaling via AKT/MAPK and IRS1-PI3K-PKC pathways promotes axonal repair and functional recovery after CNS injury, independent of anti-inflammatory effects.","evidence":"Neuronal IL-4R conditional deletion in CNS injury and EAE models; intrathecal/nasal IL-4; pathway-level analysis of IRS1-PI3K-PKC and AKT/MAPK","pmids":["25607842","29491183"],"confidence":"High","gaps":["Specific neuronal target genes downstream of IL-4-induced PKC activation uncharacterized","Whether neuronal IL-4R signaling is relevant in human neurological disease not established"]},{"year":2014,"claim":"Eosinophil-derived IL-4 was shown to drive beige fat biogenesis through alternatively activated macrophage catecholamine production and cardiac fibrotic remodeling in autoimmune myocarditis, revealing organ-specific pathological and metabolic circuits of IL-4.","evidence":"Cold exposure in IL-4/13-deficient and eosinophil-deficient mice; eosinophil-specific IL-4 conditional deletion in myocarditis model; macrophage tyrosine hydroxylase/catecholamine measurements","pmids":["24906148","28302646"],"confidence":"High","gaps":["Whether beige fat IL-4 axis operates in adult humans is debated","Direct catecholamine production by macrophages has been challenged by subsequent studies"]},{"year":2023,"claim":"IL-4 was found to programme immunosuppressive myeloid cells at the bone marrow progenitor stage, with basophil/eosinophil-derived IL-4 acting on granulocyte-monocyte progenitors via IL-4Rα to establish tumour-promoting myeloid transcriptional states.","evidence":"Progenitor-specific vs mature myeloid IL-4Rα conditional knockouts; scRNA-seq; basophil depletion; dupilumab clinical observation","pmids":["38057662"],"confidence":"High","gaps":["Whether dupilumab-mediated tumour regression is reproducible across cancer types not established","Epigenetic mechanism of progenitor imprinting by IL-4 uncharacterized"]},{"year":2024,"claim":"Spatial functional genomics demonstrated that tumour-derived IL-4 creates localized immunosuppressive niches by paracrine macrophage polarization, with loss of IL-4 in individual tumour clones producing immune-excluded microenvironments not compensated by neighbouring clones.","evidence":"Perturb-map spatial screen in ovarian cancer, IL-4 KO clones, anti-PD-1 therapy, TME macrophage phenotyping","pmids":["39481380"],"confidence":"High","gaps":["Diffusion radius of IL-4 signaling in solid tumours not quantified","Whether IL-4 niche architecture predicts immunotherapy response in patients unknown"]},{"year":null,"claim":"Key unresolved questions include the molecular identity of the STAT6-independent mechanism by which IL-4 suppresses NLRP3 inflammasome assembly, the structural basis of full-length receptor–JAK complex activation, and whether IL-4 progenitor programming in the bone marrow can be therapeutically targeted without compromising protective type 2 immunity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of full-length IL-4Rα/JAK/STAT6 signaling complex","STAT6-independent NLRP3 suppression mechanism unidentified","Therapeutic window for blocking IL-4 in cancer vs preserving helminth immunity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,7,25]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[33,34,36,39]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,7,34,37,43,44]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,7,12,23,31,34,43,44]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,10,11,25,26,36,39]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,29,30]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[6,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[15,17,18,21,22,35]}],"complexes":[],"partners":["IL4R","IL2RG","IL13RA1","STAT6","STUB1","PTPN6","IRS1"],"other_free_text":[]},"mechanistic_narrative":"IL-4 is a pleiotropic type I cytokine that orchestrates type 2 immunity, tissue repair, and metabolic homeostasis by signaling through type I (IL-4Rα/γc) and type II (IL-4Rα/IL-13Rα1) receptor complexes to activate JAK–STAT6-dependent transcription, with additional context-specific engagement of IRS1–PI3K, AKT/MAPK, and transcription-independent pathways [PMID:8266078, PMID:18243101, PMID:25607842, PMID:29491183]. In lymphocytes, IL-4 is non-redundantly required for Th2 differentiation, IgE class-switch recombination, and the broader Th2 cytokine program (IL-5, IL-9, IL-10), as demonstrated by IL-4-knockout and STAT6-knockout mice [PMID:8384701, PMID:8624821, PMID:2459206]. IL-4 drives alternative (M2) macrophage polarization through STAT6-dependent SHIP degradation and KLF4 SUMOylation, promotes eosinophil-mediated beige fat biogenesis via macrophage catecholamine production, directly stimulates hepatocyte and resident macrophage proliferation during tissue repair, and programmes immunosuppressive myeloid progenitors in the tumor microenvironment [PMID:21469115, PMID:24906148, PMID:23716700, PMID:24101381, PMID:38057662]. Negative regulation is enforced by Shp1-mediated dephosphorylation of STAT6, STUB1 (CHIP)-mediated ubiquitination and proteasomal degradation of IL-4Rα, and transcription-independent suppression of NLRP3 inflammasome assembly [PMID:23797092, PMID:24251647, PMID:25601272]."},"prefetch_data":{"uniprot":{"accession":"P05112","full_name":"Interleukin-4","aliases":["B-cell stimulatory factor 1","BSF-1","Binetrakin","Lymphocyte stimulatory factor 1","Pitrakinra"],"length_aa":153,"mass_kda":17.5,"function":"Cytokine secreted primarily by mast cells, T-cells, eosinophils, and basophils that plays a role in regulating antibody production, hematopoiesis and inflammation, and the development of effector T-cell responses (PubMed:1993171, PubMed:3016727). Induces the expression of class II MHC molecules on resting B-cells. Enhances both secretion and cell surface expression of IgE and IgG1 (PubMed:1993171). Also regulates the expression of the low affinity Fc receptor for IgE (CD23) on both lymphocytes and monocytes (PubMed:2521231). Positively regulates IL31RA expression in macrophages. Stimulates autophagy in dendritic cells by interfering with mTORC1 signaling and through the induction of RUFY4. In addition, plays a critical role in higher functions of the normal brain, such as memory and learning (By similarity). Upon binding to IL4, IL4R receptor dimerizes either with the common IL2R gamma chain/IL2RG to produce the type 1 signaling complex, located mainly on hematopoietic cells, or with the IL13RA1 to produce the type 2 complex, which is also expressed on nonhematopoietic cells (PubMed:10219247, PubMed:11526337, PubMed:18243101). Engagement of both types of receptors initiates JAK3 and to a lower extend JAK1 phosphorylation leading to activation of the signal transducer and activator of transcription 6/STAT6 (PubMed:7721895)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P05112/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/IL4","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/IL4","total_profiled":1310},"omim":[{"mim_id":"620994","title":"RUN AND FYVE DOMAINS-CONTAINING PROTEIN 4; RUFY4","url":"https://www.omim.org/entry/620994"},{"mim_id":"620983","title":"IMMUNODEFICIENCY 128; IMD128","url":"https://www.omim.org/entry/620983"},{"mim_id":"620532","title":"HYPER-IgE SYNDROME 6, AUTOSOMAL DOMINANT, WITH RECURRENT INFECTIONS; HIES6","url":"https://www.omim.org/entry/620532"},{"mim_id":"620432","title":"OSTEOCLAST STIMULATORY TRANSMEMBRANE PROTEIN; OCSTAMP","url":"https://www.omim.org/entry/620432"},{"mim_id":"620143","title":"TRANSMEMBRANE PROTEIN 232; TMEM232","url":"https://www.omim.org/entry/620143"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Not detected","tissue_distribution":"Not detected","driving_tissues":[],"url":"https://www.proteinatlas.org/search/IL4"},"hgnc":{"alias_symbol":["BSF1","IL-4","BCGF1","BCGF-1","MGC79402"],"prev_symbol":[]},"alphafold":{"accession":"P05112","domains":[{"cath_id":"1.20.1250.10","chopping":"30-151","consensus_level":"high","plddt":93.939,"start":30,"end":151}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P05112","model_url":"https://alphafold.ebi.ac.uk/files/AF-P05112-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P05112-F1-predicted_aligned_error_v6.png","plddt_mean":86.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=IL4","jax_strain_url":"https://www.jax.org/strain/search?query=IL4"},"sequence":{"accession":"P05112","fasta_url":"https://rest.uniprot.org/uniprotkb/P05112.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P05112/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P05112"}},"corpus_meta":[{"pmid":"9856950","id":"PMC_9856950","title":"Requirement 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27111145","citation_count":402,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9113989","id":"PMC_9113989","title":"P110delta, a novel phosphoinositide 3-kinase in leukocytes.","date":"1997","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9113989","citation_count":383,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26070934","id":"PMC_26070934","title":"IL-4 and IL-13 signaling in allergic airway disease.","date":"2015","source":"Cytokine","url":"https://pubmed.ncbi.nlm.nih.gov/26070934","citation_count":377,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26044597","id":"PMC_26044597","title":"T helper 2 (Th2) cell differentiation, type 2 innate lymphoid cell (ILC2) development and regulation of interleukin-4 (IL-4) and IL-13 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maturation of NK cell precursors and peripheral NK cells in vivo.","date":"2005","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/15661875","citation_count":225,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17703412","id":"PMC_17703412","title":"Genetic susceptibility to respiratory syncytial virus bronchiolitis is predominantly associated with innate immune genes.","date":"2007","source":"The Journal of infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/17703412","citation_count":223,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18641314","id":"PMC_18641314","title":"IL-21-induced isotype switching to IgG and IgA by human naive B cells is differentially regulated by IL-4.","date":"2008","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/18641314","citation_count":222,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26436920","id":"PMC_26436920","title":"miR-142-5p and miR-130a-3p are regulated by IL-4 and IL-13 and control profibrogenic macrophage program.","date":"2015","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/26436920","citation_count":221,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9334723","id":"PMC_9334723","title":"HIV-1 Vpr suppresses immune activation and apoptosis through regulation of nuclear factor kappa B.","date":"1997","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/9334723","citation_count":220,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16380445","id":"PMC_16380445","title":"Polymorphisms in the IL10 but not in the IL1beta and IL4 genes are associated with inhibitor development in patients with hemophilia 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protein purified to homogeneity, gene cloned, receptor coupling demonstrated biochemically with peptide inhibitors\",\n      \"pmids\": [\"8085155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"IL-4 rapidly activates a specific nuclear DNA-binding factor (IL-4 NAF) within minutes; activation requires tyrosine phosphorylation, demonstrated by antibodies to phosphotyrosine recognizing the IL-4 NAF-DNA complex.\",\n      \"method\": \"Electrophoretic mobility shift assay, phosphotyrosine-specific antibody supershift, kinetics of factor appearance\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical demonstration of tyrosine phosphorylation requirement with antibody recognition of the complex\",\n      \"pmids\": [\"7694370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"STAT6 is essential for IL-4 signaling: STAT6-deficient mice show complete abrogation of IL-4-induced MHC class II and IL-4 receptor upregulation on B cells, failure of B cell proliferation in response to IL-4, absence of IgE production after immunization, and failure of T lymphocytes to differentiate into Th2 cells in response to IL-4 or IL-13.\",\n      \"method\": \"Gene targeting (STAT6 knockout mice), in vivo immunization, in vitro proliferation assays, flow cytometry\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with multiple orthogonal phenotypic readouts, replicated by independent lab (PMID:8602263)\",\n      \"pmids\": [\"8624821\", \"8602263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"IL-4 is required for generation of Th2-derived cytokines (IL-5, IL-9, IL-10) in vivo: IL-4-deficient mice fail to produce Th2 cytokines and show reduced helminth-induced eosinophilia.\",\n      \"method\": \"Gene targeting (IL-4 knockout mice), cytokine measurement, helminth infection model\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean knockout with specific cytokine and cellular phenotypic readouts\",\n      \"pmids\": [\"8384701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"IL-4 is required to generate and sustain in vivo IgE responses: neutralization of IL-4 with anti-IL-4 monoclonal antibody inhibits primary polyclonal IgE responses by 99% in helminth-infected or anti-IgD-injected mice and accelerates decline of established IgE responses, without affecting IgG1 or IgG2a responses.\",\n      \"method\": \"In vivo neutralization with anti-IL-4 monoclonal antibody, ELISA for immunoglobulin isotypes, helminth infection model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — specific antibody neutralization with isotype-selective phenotypic readouts, foundational study\",\n      \"pmids\": [\"2459206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"IL-13, a cytokine structurally related to IL-4 that also binds the IL-4 receptor alpha chain, is independently required for asthma pathophysiology (airway hyperresponsiveness, eosinophil recruitment, mucus overproduction); both IL-4 and IL-13 confer asthma-like phenotype via an IL-4 receptor alpha chain-dependent pathway in T cell-deficient mice.\",\n      \"method\": \"Selective IL-13 neutralization, cytokine administration to T cell-deficient mice, IL-4Rα-dependent pathway validation\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo neutralization and reconstitution experiments defining IL-4Rα as the shared signaling component\",\n      \"pmids\": [\"9856950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"GATA-3 acts as a permissive but not sufficient enhancer of IL-4 transcription; genomic regions containing consensus GATA sites bind Th2-specific complexes and enhance GATA-3-driven IL-4 promoter transactivation, but retroviral GATA-3 transduction only partially restores IL-4 production.\",\n      \"method\": \"Transgenic reporter mice, GATA site binding assays, retroviral transduction of developing T cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic reporter and transduction assays, but GATA-3 effect on IL-4 is partial, single lab\",\n      \"pmids\": [\"9780146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"IL-4 is stochastically regulated at the level of individual alleles: most IL-4-expressing Th2 cells activate only one IL-4 allele, and the probability of activating each allele is augmented by increasing TCR signal strength.\",\n      \"method\": \"Knock-in mice with human CD2 reporter replacing one IL-4 allele, flow cytometry for monoallelic vs biallelic expression\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knock-in reporter mouse system with direct allele-specific readout\",\n      \"pmids\": [\"9729042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Basophils are a principal source of in vivo IL-4 production during nematode infection; CD4 T cells direct tissue migration of basophils and enhance IL-4 production; basophil IL-4 production is IgE-independent and only partially dependent on IL-3.\",\n      \"method\": \"IL-4-GFP knock-in reporter mice (G4 mice), flow cytometry, cell lineage markers, Rag2-/- reconstitution with CD4 T cells\",\n      \"journal\": \"Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knock-in reporter plus reconstitution experiments identifying cellular source and T cell requirement\",\n      \"pmids\": [\"15314076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"IL-4 drives differentiation of bone marrow progenitor cells into Th2 cytokine-producing eosinophils in vitro and expands IL-4-producing eosinophils in vivo; IL-4-producing eosinophils display biallelic expression of the IL-4 gene.\",\n      \"method\": \"IL-4-GFP knock-in mice, in vitro bone marrow differentiation assay, in vivo allergen challenge\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knock-in reporter mice combined with in vitro differentiation assay\",\n      \"pmids\": [\"14764670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"IL-4 directly signals tissue-resident macrophages to proliferate beyond CSF-1-controlled homeostatic levels via macrophage-intrinsic IL-4Rα signaling; mechanistically, IL-4 converts IL-4Rα+ macrophages from CSF-1-dependent to CSF-1-independent proliferation, and proliferation is restricted to sites of IL-4 production.\",\n      \"method\": \"Conditional IL-4Rα knockout mice, bone marrow chimeras, in vivo nematode infection models, flow cytometry for proliferation markers\",\n      \"journal\": \"Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-intrinsic conditional knockout with mechanistic dissection of CSF-1 dependence\",\n      \"pmids\": [\"24101381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Eosinophil-derived IL-4 stimulates hepatocyte proliferation during liver regeneration via IL-4Rα on hepatocytes (not macrophages); eosinophils are rapidly recruited to the liver after partial hepatectomy or toxin-mediated injury.\",\n      \"method\": \"Eosinophil-deficient mice, IL-4Rα conditional knockout in macrophages vs hepatocytes, partial hepatectomy and toxin injury models, BrdU incorporation\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-specific conditional knockouts with mechanistic pathway identification\",\n      \"pmids\": [\"23716700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Direct IL-4Rα signaling on smooth muscle is sufficient (but not necessary) to induce airway hyperresponsiveness; five genes promoting smooth muscle migration, proliferation, and contractility are activated by IL-13 in smooth muscle in vivo.\",\n      \"method\": \"Transgenic mice expressing or lacking IL-4Rα exclusively in smooth muscle, airway hyperresponsiveness measurement, in vivo gene expression profiling\",\n      \"journal\": \"Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific transgenic system with functional AHR readout\",\n      \"pmids\": [\"21464224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"STUB1 (CHIP) interacts with IL-4Rα and targets it for ubiquitination-mediated proteasomal degradation, terminating IL-4 and IL-13 signaling; STUB1 knockout cells show increased IL-4Rα levels and sustained STAT6 activation; STUB1-deficient mice develop spontaneous airway inflammation.\",\n      \"method\": \"Co-immunoprecipitation, immunoblot, ubiquitination assay, flow cytometry, STUB1 knockout mice, airway inflammation measurement\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional knockout with defined phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"24251647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-4-induced alternative macrophage activation requires SHIP degradation; SHIP levels decrease in IL-4-treated macrophages via STAT6-dependent mechanism; SHIP loss and arginase I induction depend on PI3K activity (specifically class IA PI3Kp110δ); reduced SHIP levels enhance IL-4-induced arginase I activity.\",\n      \"method\": \"SHIP-deficient macrophages, siRNA knockdown, PI3K inhibitors, STAT6-deficient cells, arginase activity assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockouts combined with pharmacological inhibition and multiple orthogonal assays\",\n      \"pmids\": [\"21469115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Batf, in cooperation with IRF4, Stat3, and Stat6, directly binds the CNS2 region of the IL-4 locus to trigger IL-4 production in T follicular helper cells; Batf-to-c-Maf signaling is an additional determinant of IL-4 expression specifically in Tfh cells rather than canonical Th2 cells.\",\n      \"method\": \"ChIP for Batf/IRF4/STAT3/STAT6 at IL-4 CNS2, retroviral transduction, Batf-deficient mice, Tfh cell isolation\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP demonstrating direct binding to IL-4 locus combined with genetic knockout and functional readout\",\n      \"pmids\": [\"26278622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Eosinophil-derived IL-4 drives progression of myocarditis to inflammatory dilated cardiomyopathy (DCMi); eosinophils are the major IL-4-expressing cell type in the heart during EAM; eosinophil-specific IL-4 deletion results in improved heart function; IL-4-deficient mice are protected from DCMi.\",\n      \"method\": \"Eosinophil-deficient mice, IL-4 knockout mice, eosinophil-specific IL-4 deletion, hypereosinophilic mice, echocardiography, experimental autoimmune myocarditis model\",\n      \"journal\": \"Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models including cell-specific deletion with functional cardiac readout\",\n      \"pmids\": [\"28302646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IL-4 directly signals neurons via IL-4R through the IRS1-PI3K-PKC pathway, inducing cytoskeletal remodeling and axonal repair; neuronal deletion of IL-4R abrogates the disease-ameliorating effects of intrathecal IL-4 in experimental autoimmune encephalomyelitis.\",\n      \"method\": \"Neuron-specific IL-4R conditional knockout, intrathecal IL-4 treatment, EAE models, pathway inhibitor studies\",\n      \"journal\": \"Science Translational Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional knockout identifying neuronal IL-4R as the relevant receptor with defined downstream signaling pathway\",\n      \"pmids\": [\"29491183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"T cell-derived IL-4 protects injured neurons by activating neuronal IL-4 receptors, which potentiates neurotrophin signaling via AKT and MAPK pathways; CD4+ T cells from IL-4-deficient mice fail to enhance neuronal survival after CNS injury.\",\n      \"method\": \"Two CNS injury murine models, IL-4 knockout mice, T cell adoptive transfer, neuronal culture with IL-4 treatment, AKT/MAPK pathway analysis\",\n      \"journal\": \"Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models with both in vivo and in vitro mechanistic pathway characterization\",\n      \"pmids\": [\"25607842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IL-4 induces TARC/CCL17 expression in human T cells via two STAT6 binding sites in the CCL17 promoter; mutation of either site reduces IL-4-induced promoter activation; mutation of both sites completely abrogates inducibility; STAT6 binding to both sites confirmed by EMSA and ChIP.\",\n      \"method\": \"Reporter gene assay, EMSA, chromatin immunoprecipitation, site-directed mutagenesis, STAT6-deficient cell line reconstitution\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP, EMSA, and promoter mutagenesis with functional reporter assay demonstrating direct STAT6-dependent mechanism\",\n      \"pmids\": [\"16810739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IL-4 inhibits melanogenesis in normal human melanocytes through the JAK2-STAT6 signaling pathway, downregulating MITF and dopachrome tautomerase; JAK2 inhibitor AG490 or STAT6 siRNA block this IL-4-induced downregulation.\",\n      \"method\": \"Primary human melanocyte culture, JAK2 inhibitor (AG490), STAT6 siRNA, Western blot for STAT3/STAT6 phosphorylation, mRNA and protein analysis\",\n      \"journal\": \"Journal of Investigative Dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — pharmacological inhibition plus siRNA knockdown with defined signaling pathway\",\n      \"pmids\": [\"22992805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IL-4 suppresses IL-17 expression in committed Th17 cells via STAT6-dependent inhibition of STAT3 binding at the Il17a promoter; suppression is stable when applied to immature Th17 cells but mature Th17 cells become resistant to IL-4 and lose IL-4R signaling.\",\n      \"method\": \"In vitro Th17 differentiation, IL-4 treatment at different stages, STAT6-deficient cells, ChIP for STAT3 at Il17a promoter\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP demonstrating mechanism plus genetic STAT6 requirement\",\n      \"pmids\": [\"21949021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Shp1 negatively regulates IL-4 signaling in T lymphocytes; Shp1-deficient CD4+ T cells show sustained STAT6 activation after IL-4 stimulation, enhanced Th2 skewing, and elevated serum IgE; blocking or genetically deleting IL-4 in Shp1-deficient mice markedly reduces the CD44hi T cell population.\",\n      \"method\": \"T cell-specific Shp1 conditional knockout (Shp1fl/fl CD4-cre), IL-4 stimulation assays, STAT6 phosphorylation analysis, IL-4 genetic deletion\",\n      \"journal\": \"Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-intrinsic conditional knockout with mechanistic STAT6 pathway readout confirmed by genetic epistasis\",\n      \"pmids\": [\"23797092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A cis-acting element in the second intron of the murine IL-4 gene regulates IL-4 locus chromatin accessibility through its influence on DNA methylation state; GATA-1/2, PU.1, and STAT5a/b bind this intron enhancer; deletion or mutation of the GATA binding site prevents demethylation of the IL-4 locus in IL-4-producing mast cells.\",\n      \"method\": \"DNase I footprinting, EMSA, mutational analysis, stable transgene integration, methylation analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct footprinting, EMSA binding, and functional mutation in stably integrated constructs demonstrating epigenetic regulation\",\n      \"pmids\": [\"10975840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Accessibility of site VA (5 kb 3' of IL-4 exon 4) in the IL-4 locus is a probabilistic event that determines which Th2 cells transcribe IL-4; VA opening is calcineurin/NFAT-dependent (blocked by cyclosporin A) and requires an additional factor sensitive to cycloheximide; IL-4 producers and nonproducers show similar GATA-3 and c-maf expression.\",\n      \"method\": \"Restriction enzyme accessibility assay at multiple IL-4 locus sites, purified IL-4 producers vs nonproducers, cyclosporin A and cycloheximide treatment\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct chromatin accessibility measurement at defined locus sites combined with pharmacological pathway dissection\",\n      \"pmids\": [\"14975241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"IL-4 selectively inhibits IL-2-triggered STAT5 activation (but not proliferation) in human T cells; IL-4 suppresses Jak1 and Jak3 activation and decreases IL-2Rβ expression, providing a molecular mechanism; this correlates with suppression of STAT5-dependent genes (CD25, CIS, PGE2 receptor).\",\n      \"method\": \"Primary human T cell culture, STAT5 DNA binding assay, tyrosine phosphorylation immunoblot, Jak1/Jak3 activation assay, gene expression analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical assays defining the mechanism of cross-inhibition between IL-4 and IL-2 signaling\",\n      \"pmids\": [\"9973378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IL-4, acting through the type 1 IL-4R (IL-4Rα/γc), induces STAT6-dependent IFN-γ secretion by NK and NKT cells but not conventional T cells; IL-13, which signals only through the type 2 IL-4R (IL-4Rα/IL-13Rα1), fails to stimulate IFN-γ production.\",\n      \"method\": \"In vivo cytokine capture assay, IL-4 injection, NK cell depletion (anti-IL-2Rβ), STAT6-deficient mice, STAT4-deficient mice, Rag2/γc double-deficient mice\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models identifying specific receptor type and STAT6 requirement\",\n      \"pmids\": [\"16621996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"IL-4 exacerbates anaphylaxis by acting synergistically with vasoactive mediators to increase vascular permeability; this effect requires IL-4Rα and STAT6, is independent of T cells, B cells, and common γ-chain, and is inhibited by endogenously produced IFN-γ.\",\n      \"method\": \"IL-4/IL-13 pretreatment of mice, IgE/FcγRIII cross-linking anaphylaxis models, IL-4Rα-deficient mice, STAT6-deficient mice, γ-chain-deficient mice, vascular permeability assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple knockout models with defined mechanistic readout of vascular permeability\",\n      \"pmids\": [\"12646651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"IL-4 induces eotaxin production in dermal fibroblasts at both mRNA and protein levels; IL-4 and TNF-α act synergistically to produce 10–20-fold increases in multiple eotaxin isoforms; this provides a mechanism for selective eosinophil recruitment in IL-4-mediated skin reactions.\",\n      \"method\": \"HPLC purification of eotaxin from fibroblast supernatants, SDS-PAGE, amino acid sequencing, RT-PCR, dose-response and time-course analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — protein purified to homogeneity with amino acid sequencing confirming identity, mRNA induction demonstrated\",\n      \"pmids\": [\"9551956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL-4 increases T cell (but not neutrophil) adhesion to human endothelial cells by acting on endothelial cells to upregulate alternative binding receptors; this effect is distinct from ICAM-1/LFA-1 interactions and is dose-dependent, peaking at 18–24 hours.\",\n      \"method\": \"Endothelial cell-leukocyte adhesion assay, neutralizing anti-IL-4 antibody, antibody blocking of ICAM-1 and CD18, light fixation experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional adhesion assay with antibody-blocking and cell-type specificity established, but alternative receptor not molecularly identified\",\n      \"pmids\": [\"1969883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IL-4 suppresses NLRP3 inflammasome activation in macrophages by inhibiting NLRP3-ASC oligomerization and NLRP3 subcellular redistribution into mitochondria, and by preventing microtubule polymerization; this suppression is STAT6- and mitochondrial ROS-independent and non-transcriptional.\",\n      \"method\": \"NLRP3 inflammasome reconstitution, ASC oligomerization assay, NLRP3-ASC co-IP, confocal imaging of NLRP3 speck formation, STAT6-deficient cells, siRNA, microtubule assays\",\n      \"journal\": \"Immunology and Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, reconstitution, imaging) establishing non-transcriptional mechanism\",\n      \"pmids\": [\"25601272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"IL-4 derived from bone marrow basophils and eosinophils acts on granulocyte-monocyte progenitors via IL-4Rα to transcriptionally programme immunosuppressive, tumour-promoting myeloid cell development; deletion of IL-4Rα in early myeloid progenitors (but not downstream mature myeloid cells) reduces tumour burden.\",\n      \"method\": \"Conditional IL-4Rα knockout in myeloid progenitors vs mature myeloid cells, single-cell RNA sequencing, basophil depletion, anti-IL-4Rα antibody (dupilumab) clinical trial\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockouts at defined developmental stages with mechanistic transcriptional programming, replicated in human clinical trial\",\n      \"pmids\": [\"38057662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SUMOylation of KLF4, induced by IL-4 treatment in macrophages, promotes macrophage M2 polarization (alternative activation).\",\n      \"method\": \"SUMOylation assay, KLF4 knockdown/overexpression in RAW264.7 and bone marrow-derived macrophages, M2 marker expression analysis\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — post-translational modification identified with functional consequence on M2 polarization, single lab\",\n      \"pmids\": [\"28059602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"IL-4, in combination with hydrocortisone, induces IgE isotype switching directly in human peripheral blood B cells independently of T cells and monocytes; endogenous IL-6 is required as a co-factor for IgE synthesis.\",\n      \"method\": \"Purified human B cells (FACS-sorted surface IgE-negative), IgE ELISA, anti-IL-6 antibody neutralization, T cell and monocyte depletion\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — purified sorted cell populations demonstrating direct B cell action and IL-6 co-requirement\",\n      \"pmids\": [\"1715363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IL-4 suppresses dendritic cell responses to type I IFNs by inhibiting initial STAT1 and STAT2 phosphorylation and reducing upregulation of IRF-7, STAT1, STAT2, IFN-β, and IFNARs, thereby impairing the positive autocrine amplification loop of type I IFN signaling.\",\n      \"method\": \"Primary myeloid DC stimulation in vitro and in vivo, STAT1/STAT2 phosphorylation assays, gene expression analysis of IFN response genes\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical signaling assays plus in vivo validation defining mechanism of cross-inhibition\",\n      \"pmids\": [\"17982033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL-4 increases FasL expression on CD4+ and CD8+ T cells, shifting the dominant mechanism of CTL killing from perforin-mediated to FasL (Fas/CD95L)-mediated cytotoxicity in vivo.\",\n      \"method\": \"Recombinant vaccinia virus expressing M2 antigen ± IL-4, Fas-deficient and Fas-overexpressing target cells, EGTA/Mg2+ perforin inhibition assay, FasL flow cytometry\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reconstitution with specific Fas-expressing targets and pathway-blocking assay demonstrating mechanism of killing switch\",\n      \"pmids\": [\"10725701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NKT2 cells in the thymic medulla require TCR stimulation via CD1d on macrophages for constitutive IL-4 production; hematopoietic (not stromal) APCs provide this stimulation; macrophages are the predominant cell type activating NKT2 IL-4 production.\",\n      \"method\": \"Intrathymic transfer into CD1d-deficient recipients, bone marrow chimeras, Cre-recombinase transgenic mice for cell-specific CD1d deletion, DTR transgenic mice for macrophage depletion, histocytometry\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models with cell-specific deletion and depletion confirming macrophage-NKT2 axis\",\n      \"pmids\": [\"31611396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IVIG induces IL-4 production in human basophils by interacting with basophil surface-bound IgE via F(ab')2 fragments; this is mediated through the spleen tyrosine kinase (Syk) pathway and is independent of FcγRII, type II Fc receptors, C-type lectin receptors, and sialic acid-binding immunoglobulin-like lectins.\",\n      \"method\": \"Isolated human basophil cultures, IVIG F(ab')2 and Fc fragment experiments, anti-IgE depletion from IVIG, blocking antibodies, Syk pathway inhibitors, IL-4 ELISA\",\n      \"journal\": \"Journal of Allergy and Clinical Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple blocking and depletion experiments defining the receptor and signaling pathway\",\n      \"pmids\": [\"30529242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wnt signaling potentiates IL-4 responsiveness in macrophages via a PGE2/STAT3 axis; Wnt activation enhances expression of inflammation-resolving factors at plaque-relevant low concentrations of IL-4; IL-4 is required for atherosclerosis resolution.\",\n      \"method\": \"Il4 knockout mice in atherosclerosis resolution model, Wnt pathway activation, PGE2/STAT3 pathway inhibitors, gene expression analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout and pharmacological dissection, but Wnt/PGE2/STAT3 epistasis single lab\",\n      \"pmids\": [\"33720008\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IL-4 is a pleiotropic cytokine that signals through two receptor complexes (type 1: IL-4Rα/γc; type 2: IL-4Rα/IL-13Rα1) to activate JAK1/JAK3-STAT6 as its primary transcriptional effector, driving Th2 differentiation, IgE class switching, alternative macrophage activation, eosinophil expansion, and tissue repair; its signaling is negatively regulated by STUB1-mediated ubiquitination/proteasomal degradation of IL-4Rα, by SHIP acting downstream of PI3K, and by Shp1-mediated dampening of STAT6 activation, while non-transcriptional mechanisms include suppression of NLRP3 inflammasome assembly via inhibition of microtubule polymerization; at the chromatin level, IL-4 gene expression is controlled by stochastic, NFAT-dependent opening of the VA enhancer site, GATA-3-dependent enhancer activity, and a GATA/STAT5-regulated intronic demethylation element.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1986,\n      \"finding\": \"Human IL-4 (then called B-cell stimulatory factor 1) was cloned from a concanavalin A-activated T-cell cDNA library. The encoded protein of 153 amino acids stimulates proliferation of human helper T-cell clones and anti-IgM-activated B cells, establishing its dual T-cell and B-cell stimulatory activities.\",\n      \"method\": \"cDNA cloning from human T-cell library, expression in COS-7 cells, proliferation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning with functional reconstitution in transfected cells\",\n      \"pmids\": [\"3016727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"IL-4 is required in vivo to generate and sustain IgE responses. Anti-IL-4 monoclonal antibody inhibited primary polyclonal IgE responses by 99% in nematode-infected or anti-IgD-injected mice and accelerated the decline of established IgE responses, demonstrating a non-redundant role for IL-4 in IgE production.\",\n      \"method\": \"In vivo antibody neutralization, serum IgE ELISA, mouse infection models\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean in vivo loss-of-function with defined immunological phenotype, replicated across multiple immunization models\",\n      \"pmids\": [\"2459206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"IL-4 directly induces differentiation of human precursor and pre-B cells into cytoplasmic µ- and surface IgM-positive cells without requiring cell proliferation, demonstrating a direct differentiation-promoting activity on early B-cell precursors.\",\n      \"method\": \"In vitro bone marrow culture, flow cytometry for cytoplasmic µ and surface IgM\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vitro differentiation assay on primary human cells, single lab\",\n      \"pmids\": [\"3260922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"IL-4 modulates human peripheral blood monocyte phenotype and function: it induces upregulation of MHC class II antigens, C3bi receptor, and p150.95, while inhibiting secretion of IL-1, cytostatic, and chemotactic compounds, suggesting IL-4 drives monocyte-to-macrophage differentiation and suppresses pro-inflammatory outputs.\",\n      \"method\": \"Primary monocyte culture, flow cytometry, functional cytostasis and chemotaxis assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional readouts on primary human cells, single lab\",\n      \"pmids\": [\"3279117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"IL-4 acts directly on human vascular endothelial cells to increase their adhesiveness for T cells but not neutrophils, an effect blocked by anti-IL-4 but not anti-TNF antibodies, and mediated by generation of an alternative binding receptor distinct from ICAM-1/LFA-1.\",\n      \"method\": \"Endothelial cell adhesion assays, antibody blocking, T cell/neutrophil differential adhesion measurements\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay on primary ECs with blocking antibody controls; single lab\",\n      \"pmids\": [\"1969883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"IL-4 plus hydrocortisone induces IgE isotype switching in normal purified peripheral blood B cells independent of T cells or monocytes; endogenous IL-6 was identified as a critical co-factor, as anti-IL-6 antibody strongly inhibited IgE production.\",\n      \"method\": \"Purified B cell culture, ELISA for IgE, antibody blocking, cell sorting\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct B-cell assay with multiple cytokine-blocking controls; single lab\",\n      \"pmids\": [\"1715363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"IL-4 enhances programmed cell death (apoptosis) in IL-1- or LPS-stimulated human monocytes but not in unstimulated cells, producing classic oligonucleosome-sized DNA laddering; this effect was antagonized by IFN-γ and was unique among tested cytokines.\",\n      \"method\": \"Monocyte viability assays, DNA ladder gel electrophoresis, cytokine competition experiments\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct mechanistic demonstration of apoptosis with molecular readout and cytokine specificity controls\",\n      \"pmids\": [\"1541822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Genetic disruption of the murine IL-4 gene (IL-4−/− mice) abolished Th2 cytokine responses (IL-5, IL-9, IL-10) and reduced helminth-induced eosinophilia, establishing IL-4 as required for generation of the Th2-derived cytokine program in vivo.\",\n      \"method\": \"Gene targeting/knockout mice, T-cell stimulation assays, cytokine ELISA, eosinophil counts after nematode infection\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — genetic loss-of-function with multiple in vivo phenotypic readouts; highly replicated foundational study\",\n      \"pmids\": [\"8384701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"IL-4 rapidly activates a tyrosine-phosphorylated DNA-binding factor (IL-4 NAF, later named STAT6) within minutes, which binds specific DNA sequences in IL-4-responsive gene promoters; activation required tyrosine phosphorylation as demonstrated by anti-phosphotyrosine antibody recognition of the NAF-DNA complex.\",\n      \"method\": \"EMSA, anti-phosphotyrosine antibody supershift, kinetics of nuclear factor activation\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical demonstration of tyrosine phosphorylation-dependent transcription factor activation; replicated by STAT6 cloning studies\",\n      \"pmids\": [\"7694370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The IL-2 receptor γ chain (γc) is a functional component of the IL-4 receptor: chemical cross-linking and γc augmentation of IL-4 binding affinity were demonstrated, and γc was required for IL-4-mediated phosphorylation of insulin receptor substrate-1 (IRS-1/4PS).\",\n      \"method\": \"Chemical cross-linking, binding affinity measurements, IRS-1 phosphorylation assays\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biochemical methods establishing γc as IL-4R component; foundational study replicated widely\",\n      \"pmids\": [\"8266078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"IL-4 Stat (STAT6) was purified to homogeneity, cloned, and characterized as a member of the STAT family. Phosphotyrosine-containing peptides from the intracellular domain of the IL-4 receptor inhibited IL-4 Stat activation, providing evidence for direct receptor–transcription factor coupling; the same domain mediates both receptor coupling and dimerization.\",\n      \"method\": \"Protein purification, peptide inhibition, cDNA cloning, sequence analysis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — protein purification, cloning, and mechanistic peptide-inhibition experiments; foundational STAT6 identification paper\",\n      \"pmids\": [\"8085155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"STAT6 (IL-4 Stat) is rapidly tyrosine-phosphorylated in response to IL-4 and IL-3, but not IL-2, IL-12, or erythropoietin; inducible tyrosine phosphorylation of STAT6 requires the membrane-distal region of the IL-4 receptor α chain, which is not required for mitogenesis—thus STAT6 activation is dissociated from proliferative signaling.\",\n      \"method\": \"STAT6-specific antiserum immunoprecipitation, cytokine stimulation panel, IL-4Rα truncation mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — receptor mutant dissection with immunoprecipitation; mechanistic identification of STAT6 phosphorylation site requirements\",\n      \"pmids\": [\"7760829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"STAT6-deficient mice generated by gene targeting lack IL-4-induced upregulation of MHC class II and IL-4 receptor on B cells, fail to proliferate in response to IL-4, do not produce IgE after immunization, and fail to differentiate into Th2 cells in response to IL-4 or IL-13—establishing STAT6 as essential for mediating IL-4 biological responses despite the existence of other IL-4-activated pathways.\",\n      \"method\": \"Gene targeting, B-cell proliferation assays, FACS for surface markers, IgE ELISA, Th2 differentiation assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — genetic knockout with multiple orthogonal readouts across cell types; confirmed by independent lab (PMID 8602263)\",\n      \"pmids\": [\"8624821\", \"8602263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"p110δ, a novel class I PI3K exclusively expressed in leukocytes, associates with p85 adaptor proteins and is similarly recruited to activated signaling complexes after treatment with IL-4 (and IL-3/SCF), placing PI3K signaling in the IL-4 receptor pathway.\",\n      \"method\": \"cDNA cloning, immunoprecipitation, kinase assays, cytokine stimulation in leukocyte cell lines\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical demonstration of IL-4-induced p110δ recruitment; single paper but with multiple assays\",\n      \"pmids\": [\"9113989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"IL-4 induces eotaxin production in dermal fibroblasts: a single 13-kDa eosinophil-selective chemotaxin (eotaxin) was purified and identified biochemically; IL-4 dose- and time-dependently induced eotaxin mRNA, and synergy with TNF-α produced a 10–20-fold increase in eotaxin release—providing a mechanistic basis for eosinophil recruitment in IL-4-mediated skin reactions.\",\n      \"method\": \"HPLC purification, SDS-PAGE, peptide mapping/sequencing, RT-PCR, chemotaxis assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — protein purification to homogeneity with sequence identification, confirmed by mRNA induction; single paper but multiple orthogonal methods\",\n      \"pmids\": [\"9551956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"GATA-3 acts through GATA binding sites in genomic regions surrounding the IL-4 locus as a permissive but not sufficient enhancer of IL-4 transcription in Th2 cells; retroviral GATA-3 transduction induced IL-5 to full Th2 levels but only partially restored IL-4 production, indicating additional factors are required.\",\n      \"method\": \"Reporter gene assays, EMSA for GATA binding, retroviral transduction of T cells, transgenic mouse analysis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA and retroviral transduction with quantitative cytokine readouts; single lab\",\n      \"pmids\": [\"9780146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"IL-4 requires STAT6 and IL-4Rα to exacerbate anaphylaxis; pretreatment with IL-4 dramatically increased severity of anaphylaxis induced by FcεRI or FcγRIII crosslinking. The mechanism involves IL-4 acting synergistically with vasoactive mediators to increase vascular permeability, independently of T cells, B cells, and common γ-chain, but requiring IL-4Rα and Stat6.\",\n      \"method\": \"In vivo mouse anaphylaxis models, genetic knockout mice (STAT6−/−, IL-4Rα−/−), vascular permeability assays, cytokine pretreatment experiments\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models with defined mechanistic pathway; replicated across two receptor-crosslinking systems\",\n      \"pmids\": [\"12646651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A conserved noncoding element (CNS-1) located ~650 bp upstream of the IL-4 promoter was identified as a coordinate cis-regulatory element governing co-expression of IL-4, IL-13, and IL-5 across 120 kb; YAC transgenic mice showed this element is required for full Th2-specific expression of all three cytokines.\",\n      \"method\": \"Cross-species sequence conservation analysis, YAC transgenic mice, reporter gene assays\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vivo transgenic validation of regulatory element; foundational locus-control region identification\",\n      \"pmids\": [\"10753117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"An intronic transcriptional enhancer element in intron 2 of the murine IL-4 gene maintains locus accessibility in mast cells through GATA-1/2, PU.1, and STAT5a/STAT5b binding; deletion of this element or mutation of the GATA site in a stably integrated IL-4 genomic construct prevents maintenance of a demethylated IL-4 locus, indicating a role analogous to Ig/TCR intron regulatory elements.\",\n      \"method\": \"DNase I footprinting, mutational analysis, stable genomic integration, methylation analysis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted chromatin/methylation assay with mutagenesis; single paper but rigorous mechanistic design\",\n      \"pmids\": [\"10975840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL-4 increases FasL expression on CD4+ and CD8+ T cells in vivo, shifting CTL killing from a dominant perforin-mediated pathway to a dominant Ca2+-independent Fas/FasL pathway, as demonstrated by recombinant vaccinia virus coexpressing antigen and IL-4.\",\n      \"method\": \"Recombinant vaccinia virus expression, EGTA/Mg2+ chelation to dissect killing pathways, flow cytometry for FasL, cytotoxicity assays with Fas+/− targets\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection using Fas-deficient targets and Ca2+ chelation; single lab\",\n      \"pmids\": [\"10725701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL-4 expression in Clara cells of transgenic mice drives IL-4-dependent increases in surfactant phosphatidylcholine synthesis and clearance, and selectively induces SP-D mRNA ~2.8-fold and protein ~90-fold, establishing a previously unrecognized IL-4 role in pulmonary surfactant homeostasis.\",\n      \"method\": \"Transgenic mouse lung analysis, radiolabeled lipid incorporation, Northern/Western blot for surfactant proteins\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic gain-of-function with metabolic labeling; single lab\",\n      \"pmids\": [\"10645893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"IL-4 probabilistically regulates IL-4 production at the single-cell level through stochastic opening of a chromatin site (VA, 5 kb 3′ of exon 4); this opening requires calcineurin/NFAT (blocked by cyclosporin A) and an additional cycloheximide-sensitive factor; producers and nonproducers have similar GATA-3/c-maf levels and similar accessibility at other IL-4 locus sites.\",\n      \"method\": \"Restriction enzyme accessibility (REA) assay, cyclosporin A treatment, cycloheximide treatment, single-cell cytokine capture\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct chromatin accessibility assay with pharmacological dissection of required factors; mechanistically defines stochastic regulation\",\n      \"pmids\": [\"14975241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IL-4 induces TARC/CCL17 expression in human T cells via two STAT6 binding sites in the CCL17 promoter; EMSA and chromatin immunoprecipitation confirmed direct STAT6 binding; mutation of both sites completely abolished IL-4 inducibility in reporter assays, establishing a STAT6-dependent direct transcriptional mechanism.\",\n      \"method\": \"ChIP, EMSA, promoter reporter assays, STAT6-deficient cell line reconstitution\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP + EMSA + mutagenesis with reporter reconstitution in STAT6-null cells; rigorous mechanistic dissection\",\n      \"pmids\": [\"16810739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IL-4, acting through the type 1 IL-4R (IL-4Rα/γc) and requiring STAT6, induces IFN-γ production by NK and NKT cells in vivo within 2–4 hours; IL-13, which signals only through the type 2 IL-4R (IL-4Rα/IL-13Rα1), fails to stimulate IFN-γ and even suppresses basal IFN-γ production—establishing distinct functional outcomes of type 1 vs type 2 IL-4R signaling.\",\n      \"method\": \"In vivo cytokine capture assay, anti-IL-2Rβ NK depletion, Rag2/γc double KO mice, STAT4 KO mice, STAT6 KO mice, cytokine neutralization\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological models; mechanistic dissection of type 1 vs type 2 receptor outcomes\",\n      \"pmids\": [\"16621996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TSLP drives Th2 differentiation independently of exogenous IL-4 by directly inducing IL-4 gene transcription in CD4+ T cells; this process requires STAT6 and is independent of IL-2, establishing a TSLP→IL-4→STAT6 positive-feedback pathway.\",\n      \"method\": \"In vitro Th2 differentiation with anti-IL-4 blocking, STAT6 KO T cells, IL-4 mRNA kinetics by RT-PCR\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — blocking antibody and STAT6-KO genetic dissection; single lab\",\n      \"pmids\": [\"17237387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structures of the complete type I (IL-4Rα/γc/IL-4) and type II (IL-4Rα/IL-13Rα1/IL-4 and IL-4Rα/IL-13Rα1/IL-13) ternary signaling complexes revealed: (1) structural basis for γc recognition of six different γc-cytokines; (2) IL-13Rα1 uses an unusual top-mounted Ig-like domain for cytokine engagement; (3) reversed assembly sequences for type I vs type II complexes mediated by different recognition chemistries; (4) the type II heterodimer signals with different potencies for IL-4 vs IL-13, with extracellular interactions modulating intracellular membrane-proximal signaling.\",\n      \"method\": \"X-ray crystallography of ternary complexes, cell-based signaling potency assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures of all three receptor complexes with functional validation; foundational structural study\",\n      \"pmids\": [\"18243101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Alternative (M2) macrophage activation by IL-4 requires STAT6-dependent degradation of SHIP; IL-4-treated macrophages show decreased SHIP protein levels dependent on PI3K activity (specifically class IA PI3Kp110δ isoform); reducing SHIP enhanced, while SHIP overexpression reduced, IL-4-induced arginase I activity—identifying SHIP as a PI3K-regulated negative regulator of IL-4-driven M2 polarization.\",\n      \"method\": \"SHIP KO macrophages, PI3K inhibitors, SHIP siRNA knockdown, SHIP overexpression, arginase activity assays, STAT6 KO cells\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological dissections with defined enzymatic readout; mechanistically rigorous\",\n      \"pmids\": [\"21469115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Direct IL-4Rα stimulation of smooth muscle is sufficient (but not necessary) to induce airway hyperresponsiveness (AHR); transgenic mice in which smooth muscle is the only cell expressing or lacking IL-4Rα demonstrated that IL-4, IL-13, or allergen acting on smooth muscle alone activates five genes promoting smooth muscle migration, proliferation, and contractility.\",\n      \"method\": \"Cell-type-specific IL-4Rα transgenic and conditional knockout mice, methacholine challenge (AHR measurement), gene expression profiling\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific genetic rescue and deletion with defined physiological readout\",\n      \"pmids\": [\"21464224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IL-4 inhibits melanogenesis in normal human melanocytes via the JAK2-STAT6 signaling pathway: IL-4 treatment increased STAT3 and STAT6 phosphorylation; the JAK2 inhibitor AG490 or STAT6 siRNA blocked IL-4-induced downregulation of MITF and dopachrome tautomerase expression.\",\n      \"method\": \"Primary human melanocyte culture, Western blot for STAT phosphorylation, RT-PCR, JAK2 inhibitor, STAT6 siRNA knockdown\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and siRNA dissection with molecular readouts; single lab\",\n      \"pmids\": [\"22992805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"IL-4 derived from eosinophils stimulates hepatocyte proliferation via IL-4Rα on hepatocytes to promote liver regeneration after partial hepatectomy and toxin-mediated injury; macrophage IL-4Rα signaling was found dispensable, establishing direct IL-4→hepatocyte IL-4Rα→proliferation as the operative pathway.\",\n      \"method\": \"Partial hepatectomy and toxin injury models, eosinophil-deficient mice, macrophage-specific and hepatocyte-specific IL-4Rα conditional knockouts, BrdU incorporation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional knockouts identifying the required cellular target; multiple injury models\",\n      \"pmids\": [\"23716700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"IL-4 converts tissue-resident macrophages from a CSF-1-dependent to a CSF-1-independent proliferation program via macrophage-intrinsic IL-4Rα signaling; IL-4Rα expression confers a competitive advantage with higher and more sustained proliferation; unlike CSF-1, the IL-4 pathway expands resident macrophage density without triggering monocyte or neutrophil recruitment.\",\n      \"method\": \"Nematode infection models, macrophage-specific IL-4Rα conditional knockout mice, mixed bone marrow chimeras, BrdU/Ki67 proliferation assays, competitive reconstitution\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-intrinsic conditional knockout with competitive chimera experiments; mechanistically resolved CSF-1 vs IL-4 pathways\",\n      \"pmids\": [\"24101381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Shp1 (PTPN6) negatively regulates IL-4 signaling in T cells: T cell-specific Shp1 deletion leads to sustained STAT6 activation after IL-4 stimulation, skewing toward Th2 lineage and elevated serum IgE; IL-4 blockade or genetic IL-4 deletion in Shp1-deficient mice abolished the CD44hi memory T-cell phenotype, placing Shp1 as a negative regulator of IL-4/STAT6 signaling.\",\n      \"method\": \"T cell-specific Cre/lox Shp1 deletion, Shp1fl/fl IL-4−/− double KO, STAT6 phosphorylation kinetics, flow cytometry, serum IgE ELISA\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-intrinsic conditional deletion and genetic epistasis with double KO; multiple orthogonal readouts\",\n      \"pmids\": [\"23797092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"STUB1 (CHIP E3 ubiquitin ligase) interacts with IL-4Rα and targets it for ubiquitination-mediated proteasomal degradation, thereby terminating IL-4/IL-13 signaling; STUB1 knockout cells show increased IL-4Rα levels and sustained STAT6 activation; STUB1 overexpression reduced IL-4Rα levels; STUB1-deficient mice develop spontaneous airway inflammation and elevated IgE.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, flow cytometry, STUB1 KO mice, STUB1 overexpression\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ubiquitination assay, gain/loss-of-function, and in vivo KO phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"24251647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IL-4 suppresses NLRP3 inflammasome activation in macrophages via a transcription-independent mechanism: IL-4 inhibits NLRP3-dependent ASC oligomerization, NLRP3-ASC interaction, and speck formation, and blocks subcellular redistribution of NLRP3 into mitochondria and microtubule polymerization; this suppression is STAT6-independent and mitochondrial ROS-independent.\",\n      \"method\": \"NLRP3 inflammasome reconstitution in macrophages, ASC oligomerization assay, NLRP3-ASC co-IP, immunofluorescence for NLRP3 localization, STAT6 KO cells, microtubule inhibitors\",\n      \"journal\": \"Immunology and cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — reconstituted NLRP3 system with multiple biochemical assays and genetic/pharmacological controls\",\n      \"pmids\": [\"25601272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Eosinophil-derived IL-4 and alternatively activated macrophages constitute an efferent circuit for cold-induced beige fat biogenesis: genetic loss of eosinophils or IL-4/IL-13 signaling impairs cold-induced beige fat development; mechanistically, macrophages recruited to cold-stressed white adipose tissue undergo alternative activation to upregulate tyrosine hydroxylase and produce catecholamines required for tissue browning.\",\n      \"method\": \"Eosinophil-deficient mice, IL-4/13 signal-deficient mice, cold exposure, UCP1 expression, macrophage adoptive transfer, tyrosine hydroxylase expression/catecholamine measurements\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models with mechanistic dissection of catecholamine synthesis pathway; highly cited\",\n      \"pmids\": [\"24906148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Batf, in cooperation with IRF4, STAT3, and STAT6, drives IL-4 production specifically in T follicular helper (Tfh) cells by directly binding and activating the CNS2 region of the IL-4 locus; Batf deficiency impairs IL-4-producing Tfh cells without affecting canonical Th2 cells; Batf-to-c-Maf signaling is also required for Tfh IL-4 expression.\",\n      \"method\": \"ChIP, Batf conditional knockout mice, Tfh adoptive transfer, cytokine ELISA, asthma model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP-confirmed direct binding at IL-4 CNS2 combined with in vivo Batf KO; mechanistically resolves Tfh vs Th2 IL-4 regulation\",\n      \"pmids\": [\"26278622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"T cell-derived IL-4 protects and promotes recovery of injured neurons by activating neuronal IL-4 receptors, which potentiate neurotrophin signaling via the AKT and MAPK pathways; neuronal deletion of IL-4R abrogated IL-4-mediated functional recovery in CNS injury models.\",\n      \"method\": \"Two murine CNS injury models, neuronal IL-4R conditional deletion, wild-type vs IL-4 KO T-cell transfer, neuron culture + IL-4 treatment, AKT/MAPK pathway analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional neuronal IL-4R deletion and T-cell transfer experiments with pathway-level mechanistic data\",\n      \"pmids\": [\"25607842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Eosinophil-derived IL-4 drives progression of autoimmune myocarditis to inflammatory dilated cardiomyopathy (DCMi); IL-4−/− mice are protected from DCMi like eosinophil-deficient mice; eosinophil-specific IL-4 deletion recapitulated this protection, establishing eosinophil-derived IL-4 as the mechanistic driver of cardiac fibrotic remodeling.\",\n      \"method\": \"Experimental autoimmune myocarditis model, IL-4 KO, eosinophil-deficient ΔdblGATA1 mice, IL-5Tg hypereosinophilic mice, eosinophil-specific IL-4 conditional deletion, echocardiography\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models including eosinophil-specific conditional deletion; convergent evidence across models\",\n      \"pmids\": [\"28302646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SUMOylation of KLF4 is induced by IL-4 treatment in macrophages and is required for IL-4-driven M2 polarization; SUMOylation-defective KLF4 failed to promote M2 markers in RAW264.7 cells and BMDMs, identifying KLF4 SUMOylation as a post-translational mechanism downstream of IL-4 signaling.\",\n      \"method\": \"SUMOylation assays, KLF4 mutant overexpression, BMDMs and RAW264.7 macrophage polarization assays, flow cytometry\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab with SUMOylation assay and functional KLF4 mutant; moderate evidence\",\n      \"pmids\": [\"28059602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IL-4 exerts direct neuronal signaling via the IRS1-PI3K-PKC pathway to promote cytoskeletal remodeling and axonal repair; intrathecal IL-4 reversed disease progression in chronic EAE without affecting inflammation; neuronal deletion of IL-4R abolished the benefit, and nasal delivery was equally effective.\",\n      \"method\": \"Multiple EAE models, neuronal IL-4R conditional deletion, intrathecal/nasal IL-4 administration, IRS1-PI3K-PKC pathway analysis, cytoskeletal readouts\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional neuronal IL-4R deletion with pathway-level mechanistic characterization; multiple EAE models\",\n      \"pmids\": [\"29491183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IVIG induces IL-4 secretion in human basophils by interacting with basophil surface-bound IgE via F(ab')2 fragments through the spleen tyrosine kinase (Syk) pathway; this effect is independent of FcγRII, type II Fc receptors, C-type lectin receptors, and sialic acid-binding immunoglobulin-like lectins.\",\n      \"method\": \"Basophil isolation, Syk pathway inhibitors, blocking antibodies for multiple Fc/lectin receptors, IVIG fragment (F(ab')2 vs Fc) experiments, CD69/cytokine ELISA\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic receptor exclusion with functional fragments and pathway inhibitors; single lab\",\n      \"pmids\": [\"30529242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NKT2 cells in the thymic medulla require continuous TCR stimulation for constitutive IL-4 production; hematopoietic (not stromal) APCs provide this signal; macrophages are the predominant APCs stimulating NKT2 IL-4 production, as demonstrated by CD1d cell-specific deletion and diphtheria toxin-mediated depletion of specific APC populations.\",\n      \"method\": \"Intrathymic transfer into CD1d-deficient hosts, bone marrow chimeras, APC-specific Cre CD1d deletion, DTR-mediated depletion, histocytometry\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific genetic and depletion strategies converging on macrophage-NKT2 IL-4 axis\",\n      \"pmids\": [\"31611396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wnt signaling potentiates IL-4 responsiveness in macrophages via a PGE2/STAT3 axis during atherosclerosis resolution; IL-4-deficient mice show impaired resolution; Wnt pathway activation enhances expression of inflammation-resolving factors after low-concentration IL-4 treatment, mechanistically linking Wnt and IL-4/STAT6 pathways.\",\n      \"method\": \"Il4 KO mice atherosclerosis resolution model, Wnt pathway modulation, PGE2/STAT3 pathway inhibition, macrophage gene expression\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with pharmacological dissection of Wnt-PGE2-STAT3 axis; single lab\",\n      \"pmids\": [\"33720008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"IL-4 derived from bone marrow basophils and eosinophils acts on granulocyte-monocyte progenitors via IL-4Rα to transcriptionally programme immunosuppressive tumour-promoting myeloid cells; only deletion of IL-4Rα in early myeloid progenitors (not mature myeloid cells) reduced tumour burden, establishing a bone marrow–level IL-4 signalling axis in cancer immunosuppression.\",\n      \"method\": \"Single-cell RNA sequencing, panel of conditional IL-4Rα knockout mice (progenitor-specific vs mature myeloid), basophil depletion, clinical trial with IL-4Rα blocking antibody dupilumab\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-stage-specific conditional KO panel with scRNA-seq mechanistic data; translated to clinical observation\",\n      \"pmids\": [\"38057662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Ovarian cancer cells are a key source of IL-4 that drives formation of an immunosuppressive TME via macrophage control; IL-4 loss from cancer clones creates short-range immune-excluded niches not compensated by neighboring IL-4-expressing clones, revealing localized paracrine regulation of TME composition and immunotherapy resistance.\",\n      \"method\": \"Perturb-map spatial functional genomics screen, IL-4 knockout in tumor clones, anti-PD-1 treatment, TME macrophage characterization\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — spatial functional screen with genetic IL-4 loss and in vivo tumor immune phenotyping; single paper but rigorous methodology\",\n      \"pmids\": [\"39481380\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IL-4 is a four-α-helical type I cytokine that signals through type I (IL-4Rα/γc) and type II (IL-4Rα/IL-13Rα1) receptor complexes whose ternary structures are resolved crystallographically; ligand binding activates JAK1/JAK3 (type I) or JAK1/TYK2 (type II), leading to STAT6 tyrosine phosphorylation, dimerization, and nuclear translocation to drive Th2 differentiation, IgE class switching, M2 macrophage polarization, and regulation of tissue homeostasis—with negative feedback provided by STUB1-mediated ubiquitination/proteasomal degradation of IL-4Rα and Shp1/SHIP phosphatase activity—while additional context-specific pathways include IRS1-PI3K-PKC (neuronal repair), AKT/MAPK (neurotrophin potentiation), and transcription-independent suppression of NLRP3 inflammasome assembly.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"IL-4 is a pleiotropic cytokine that orchestrates type 2 immunity, tissue repair, and myeloid cell programming by signaling through IL-4Rα-containing receptor complexes to activate the JAK-STAT6 axis as its principal transcriptional effector. IL-4 is essential for Th2 cell differentiation, IgE class switching in B cells, alternative macrophage activation, and eosinophil expansion, with STAT6-deficient mice showing complete loss of these responses [PMID:8624821, PMID:8384701, PMID:2459206]. Beyond canonical immune functions, IL-4 signals directly on non-hematopoietic cells—including hepatocytes to promote liver regeneration, neurons to potentiate neurotrophin-mediated axonal repair via IRS1-PI3K-AKT, and smooth muscle to drive airway hyperresponsiveness—and acts on myeloid progenitors to transcriptionally programme immunosuppressive tumour-promoting myeloid cells [PMID:23716700, PMID:29491183, PMID:21464224, PMID:38057662]. IL-4 signaling is negatively regulated by STUB1-mediated ubiquitination and proteasomal degradation of IL-4Rα, by Shp1-mediated dephosphorylation of STAT6, and through a non-transcriptional, STAT6-independent mechanism that suppresses NLRP3 inflammasome assembly by inhibiting microtubule polymerization [PMID:24251647, PMID:23797092, PMID:25601272].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Establishing that IL-4 is the non-redundant cytokine required for IgE class switching resolved which signal drives humoral type 2 immunity in vivo.\",\n      \"evidence\": \"Anti-IL-4 neutralizing antibody in helminth-infected and anti-IgD-injected mice abolished >99% of IgE without affecting IgG1/IgG2a\",\n      \"pmids\": [\"2459206\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of class-switch recombination at the IgE locus not defined\", \"Whether IL-4 acts directly on B cells or requires intermediary cells not resolved\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Demonstrating that IL-4 directly induces IgE switching in purified B cells (with hydrocortisone and endogenous IL-6) resolved the cell-autonomous versus bystander question for IgE production.\",\n      \"evidence\": \"FACS-sorted surface-IgE-negative human B cells cultured without T cells or monocytes\",\n      \"pmids\": [\"1715363\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin-level mechanism of germline transcription at IgE locus not characterized\", \"Contribution of IL-13 via shared IL-4Rα not yet recognized\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Two contemporaneous advances identified a tyrosine-phosphorylated transcription factor (IL-4 NAF/IL-4 Stat/STAT6) directly coupled to the IL-4 receptor, establishing the first receptor-to-nucleus signaling pathway for IL-4.\",\n      \"evidence\": \"EMSA with phosphotyrosine-specific antibody supershift; protein purification and gene cloning of IL-4 Stat with phosphotyrosine peptide inhibition of receptor coupling\",\n      \"pmids\": [\"7694370\", \"8085155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional STATs are activated by IL-4 in different cell types\", \"Structural basis of STAT6-receptor interaction not determined\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"IL-4 knockout mice proved IL-4 is essential for the entire Th2 cytokine programme (IL-5, IL-9, IL-10) and for helminth-induced eosinophilia, establishing IL-4 as the master initiator of type 2 immunity.\",\n      \"evidence\": \"IL-4-deficient mice generated by gene targeting, tested in helminth infection\",\n      \"pmids\": [\"8384701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IL-4 acts on T cell progenitors or mature T cells to initiate Th2 differentiation\", \"Redundancy with IL-13 for downstream effector functions not tested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"STAT6 knockout mice demonstrated that STAT6 is the obligate transcriptional mediator of essentially all canonical IL-4 functions—MHC II upregulation, B cell proliferation, IgE production, and Th2 differentiation.\",\n      \"evidence\": \"STAT6 gene-targeted mice with multiple orthogonal phenotypic readouts, independently replicated\",\n      \"pmids\": [\"8624821\", \"8602263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"STAT6-independent IL-4 signaling outputs not systematically explored\", \"Downstream STAT6 target gene repertoire not mapped\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Three discoveries collectively defined the transcriptional and functional landscape of IL-4: stochastic monoallelic IL-4 gene expression established a probabilistic model of cytokine production; GATA-3 was shown to be a permissive but insufficient enhancer of IL-4 transcription; and IL-13 was found to share asthma-effector functions through the common IL-4Rα chain.\",\n      \"evidence\": \"Knock-in reporter mice for allele-specific IL-4 expression; transgenic reporter/retroviral transduction for GATA-3; selective IL-13 neutralization in T cell-deficient mice\",\n      \"pmids\": [\"9729042\", \"9780146\", \"9856950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What determines whether one or both IL-4 alleles open\", \"Whether GATA-3 and IL-13 pathways interact at the level of shared enhancers\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"IL-4 was found to selectively suppress IL-2-triggered STAT5 activation by inhibiting Jak1/Jak3 and downregulating IL-2Rβ, revealing a cross-inhibitory circuit between type 2 and type 1 T cell signaling.\",\n      \"evidence\": \"Primary human T cells, STAT5 DNA binding, Jak phosphorylation immunoblots\",\n      \"pmids\": [\"9973378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this cross-inhibition operates in vivo during mixed cytokine environments\", \"The receptor proximal basis of selective STAT5 vs STAT6 pathway interference\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"A GATA/STAT5-regulated intronic element in the IL-4 gene was shown to control locus demethylation, establishing that IL-4 expression is epigenetically gated.\",\n      \"evidence\": \"DNase I footprinting, EMSA, and mutational analysis of IL-4 intron 2 in stably integrated transgenes with methylation analysis\",\n      \"pmids\": [\"10975840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this element functions identically in T cells vs mast cells\", \"How intronic demethylation coordinates with the VA enhancer accessibility\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The VA enhancer site was identified as the calcineurin/NFAT-dependent probabilistic switch determining which Th2 cells transcribe IL-4, while basophils—not T cells—were shown to be the principal IL-4 source during helminth infection.\",\n      \"evidence\": \"Restriction enzyme accessibility at defined IL-4 locus sites with cyclosporin A; IL-4-GFP knock-in reporter mice in nematode infection\",\n      \"pmids\": [\"14975241\", \"15314076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the cycloheximide-sensitive co-factor required for VA opening\", \"How basophil-derived IL-4 feeds back to prime Th2 differentiation in vivo\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"IL-4 was shown to induce STAT6-dependent IFN-γ from NK/NKT cells specifically through the type 1 (IL-4Rα/γc) receptor, and STAT6 was demonstrated to directly bind and activate the CCL17 promoter, expanding the catalogue of STAT6-dependent target genes.\",\n      \"evidence\": \"In vivo cytokine capture with multiple receptor-chain knockout mice; ChIP and promoter mutagenesis for STAT6 at CCL17\",\n      \"pmids\": [\"16621996\", \"16810739\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full genome-wide map of direct STAT6 targets not available at this time\", \"Whether type 1 vs type 2 receptor usage is cell-type determined or ligand-concentration dependent\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Two studies expanded IL-4's functional reach beyond immune cells: direct IL-4Rα signaling on smooth muscle was sufficient for airway hyperresponsiveness, and IL-4-induced alternative macrophage activation was shown to require PI3K-dependent SHIP degradation.\",\n      \"evidence\": \"Transgenic mice expressing IL-4Rα exclusively in smooth muscle with AHR readout; SHIP-deficient macrophages and PI3K inhibitors with arginase activity assays\",\n      \"pmids\": [\"21464224\", \"21469115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Five smooth muscle genes identified but their individual contributions to AHR not tested\", \"How STAT6 mechanistically drives SHIP degradation not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Cell-type-specific conditional knockouts revealed IL-4 drives tissue-resident macrophage proliferation independently of CSF-1, hepatocyte proliferation via eosinophil-derived IL-4 during liver regeneration, and established Shp1 as a negative regulator of IL-4/STAT6 signaling in T cells.\",\n      \"evidence\": \"Conditional IL-4Rα knockout in macrophages vs hepatocytes in injury models; T cell-specific Shp1 deletion with STAT6 phosphorylation kinetics and genetic epistasis\",\n      \"pmids\": [\"24101381\", \"23716700\", \"23797092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which IL-4 uncouples macrophage proliferation from CSF-1 not defined\", \"Direct Shp1 substrate identity on STAT6 complex not confirmed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"STUB1/CHIP was identified as the E3 ubiquitin ligase that targets IL-4Rα for proteasomal degradation, establishing a receptor-level negative feedback mechanism whose loss causes spontaneous airway inflammation.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitination assays, STUB1 knockout mice with sustained STAT6 activation and airway inflammation\",\n      \"pmids\": [\"24251647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether STUB1-mediated degradation is constitutive or signal-induced\", \"Lysine residues on IL-4Rα targeted for ubiquitination not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Three advances refined IL-4 signaling: IL-4 suppresses NLRP3 inflammasome assembly through a non-transcriptional, STAT6-independent mechanism involving microtubule polymerization inhibition; Batf/IRF4 directly bind the IL-4 CNS2 to drive Tfh-specific IL-4 production; and IL-4 from T cells protects injured neurons via AKT/MAPK potentiation of neurotrophin signaling.\",\n      \"evidence\": \"NLRP3-ASC reconstitution and microtubule assays in STAT6-deficient cells; ChIP at IL-4 CNS2 with Batf-deficient mice; CNS injury models with IL-4 knockout and neuronal culture\",\n      \"pmids\": [\"25601272\", \"26278622\", \"25607842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of IL-4 that inhibits tubulin polymerization not identified\", \"Whether Batf-CNS2 mechanism is conserved in human Tfh cells\", \"Whether neuronal IL-4R signals through STAT6 or exclusively through PI3K\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Eosinophil-derived IL-4 was shown to drive pathological cardiac remodeling (myocarditis to dilated cardiomyopathy), extending IL-4's tissue-damage role beyond the lung.\",\n      \"evidence\": \"Eosinophil-specific IL-4 deletion, IL-4 knockout, and hypereosinophilic mice in experimental autoimmune myocarditis with echocardiography\",\n      \"pmids\": [\"28302646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cardiac cell type responding to eosinophil IL-4 (cardiomyocyte vs fibroblast vs endothelium) not defined\", \"STAT6 dependence of cardiac phenotype not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Neuron-specific IL-4Rα conditional knockout demonstrated that IL-4 signals directly on neurons via IRS1-PI3K-PKC to induce cytoskeletal remodeling and axonal repair, independent of immune cell intermediaries.\",\n      \"evidence\": \"Neuron-specific IL-4R conditional knockout in EAE with intrathecal IL-4, pathway inhibitor studies\",\n      \"pmids\": [\"29491183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which PKC isoform mediates neuronal cytoskeletal remodeling\", \"Whether neuronal IL-4R uses type 1 or type 2 receptor complex\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"IL-4 from bone marrow basophils and eosinophils was found to transcriptionally programme immunosuppressive myeloid cells at the progenitor stage, identifying IL-4Rα on granulocyte-monocyte progenitors as a tumour-promoting node amenable to therapeutic blockade.\",\n      \"evidence\": \"Conditional IL-4Rα knockout at myeloid progenitor vs mature stages, scRNA-seq, dupilumab clinical trial\",\n      \"pmids\": [\"38057662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full transcriptional programme imposed by IL-4 on myeloid progenitors not mapped\", \"Whether dupilumab's anti-tumour effect is solely through IL-4 or also IL-13 blockade\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved questions include the identity of the molecular target through which IL-4 inhibits microtubule polymerization to suppress NLRP3 inflammasome assembly, the structural basis of differential signaling through type 1 versus type 2 IL-4 receptors, and the genome-wide direct STAT6 target gene repertoire across different IL-4-responsive cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Non-transcriptional IL-4 effector targeting microtubules unidentified\", \"Structural basis of type 1 vs type 2 IL-4R signaling specificity unknown\", \"Comprehensive STAT6 cistrome across cell types not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [3, 4, 8, 9, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 3, 4, 5, 14, 26, 27, 30, 34]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 17, 18, 20, 22, 25]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 15, 19, 23, 24]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"STAT6\",\n      \"IL4R\",\n      \"IL13RA1\",\n      \"GATA3\",\n      \"STUB1\",\n      \"PTPN6\",\n      \"BATF\",\n      \"INPPL1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"IL-4 is a pleiotropic type I cytokine that orchestrates type 2 immunity, tissue repair, and metabolic homeostasis by signaling through type I (IL-4Rα/γc) and type II (IL-4Rα/IL-13Rα1) receptor complexes to activate JAK–STAT6-dependent transcription, with additional context-specific engagement of IRS1–PI3K, AKT/MAPK, and transcription-independent pathways [PMID:8266078, PMID:18243101, PMID:25607842, PMID:29491183]. In lymphocytes, IL-4 is non-redundantly required for Th2 differentiation, IgE class-switch recombination, and the broader Th2 cytokine program (IL-5, IL-9, IL-10), as demonstrated by IL-4-knockout and STAT6-knockout mice [PMID:8384701, PMID:8624821, PMID:2459206]. IL-4 drives alternative (M2) macrophage polarization through STAT6-dependent SHIP degradation and KLF4 SUMOylation, promotes eosinophil-mediated beige fat biogenesis via macrophage catecholamine production, directly stimulates hepatocyte and resident macrophage proliferation during tissue repair, and programmes immunosuppressive myeloid progenitors in the tumor microenvironment [PMID:21469115, PMID:24906148, PMID:23716700, PMID:24101381, PMID:38057662]. Negative regulation is enforced by Shp1-mediated dephosphorylation of STAT6, STUB1 (CHIP)-mediated ubiquitination and proteasomal degradation of IL-4Rα, and transcription-independent suppression of NLRP3 inflammasome assembly [PMID:23797092, PMID:24251647, PMID:25601272].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Cloning of human IL-4 established its identity as a dual T-cell and B-cell growth factor, resolving the molecular basis of 'B-cell stimulatory factor 1' activity.\",\n      \"evidence\": \"cDNA cloning from ConA-activated T-cell library, COS-7 expression, proliferation assays on T-cell clones and anti-IgM-activated B cells\",\n      \"pmids\": [\"3016727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor identity unknown\", \"Signaling pathway undetermined\", \"In vivo requirement not yet tested\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"In vivo antibody neutralization and in vitro differentiation assays demonstrated that IL-4 is non-redundantly required for IgE production and directly promotes B-cell differentiation, establishing its central role in humoral type 2 immunity.\",\n      \"evidence\": \"Anti-IL-4 mAb in nematode-infected and anti-IgD-injected mice (99% IgE inhibition); purified B-cell differentiation assays\",\n      \"pmids\": [\"2459206\", \"3260922\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of isotype switching not resolved\", \"Intracellular signaling pathway unknown\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"IL-4 was shown to modulate monocyte/macrophage phenotype—upregulating MHC class II while suppressing pro-inflammatory mediators—and to selectively increase endothelial adhesiveness for T cells, extending its functional scope beyond lymphocytes.\",\n      \"evidence\": \"Primary monocyte culture with flow cytometry and functional assays; endothelial adhesion assays with blocking antibodies\",\n      \"pmids\": [\"3279117\", \"1969883\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Monocyte signaling pathway uncharacterized\", \"Identity of the T-cell-selective endothelial adhesion receptor unknown\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"IL-4 gene knockout mice and identification of STAT6 (IL-4 NAF) as a rapidly tyrosine-phosphorylated transcription factor resolved the non-redundant in vivo requirement for IL-4 in Th2 commitment and linked receptor engagement to a defined transcriptional mechanism.\",\n      \"evidence\": \"IL-4−/− mice with abolished Th2 cytokine program; EMSA/anti-phosphotyrosine supershift identifying STAT6 DNA-binding complex; γc cross-linking and IRS-1 phosphorylation\",\n      \"pmids\": [\"8384701\", \"7694370\", \"8266078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"STAT6 gene not yet cloned\", \"Relative contributions of STAT6 vs IRS pathways to different IL-4 responses unclear\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Purification, cloning, and peptide-inhibition studies of STAT6 defined the direct receptor–transcription factor coupling mechanism, showing that phosphotyrosine motifs on IL-4Rα recruit and activate STAT6.\",\n      \"evidence\": \"Protein purification to homogeneity, cDNA cloning, phosphotyrosine peptide competition\",\n      \"pmids\": [\"8085155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of receptor–STAT6 interaction unavailable\", \"Role of STAT6 dimerization in target gene selectivity unknown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"STAT6 knockout mice demonstrated that virtually all canonical IL-4 biological responses—B-cell proliferation, MHC II upregulation, IgE production, Th2 differentiation—require STAT6, even though IL-4 activates other pathways.\",\n      \"evidence\": \"STAT6−/− mice with complete loss of IL-4-driven B-cell and T-cell responses; independently confirmed by two labs\",\n      \"pmids\": [\"8624821\", \"8602263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"STAT6-independent IL-4 functions not yet catalogued\", \"Tissue-specific IL-4 responses (e.g., neuronal, metabolic) not examined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of cis-regulatory elements controlling IL-4 gene expression—the CNS-1 locus control region and an intronic enhancer maintained by GATA/STAT5—revealed how coordinated Th2 cytokine gene expression is epigenetically regulated.\",\n      \"evidence\": \"YAC transgenic mice for CNS-1; DNase footprinting and methylation analysis for intronic enhancer with GATA/PU.1/STAT5 binding\",\n      \"pmids\": [\"10753117\", \"10975840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Three-dimensional chromatin architecture of IL-4/IL-13/IL-5 locus not resolved\", \"Cell-type-specific enhancer usage (mast cell vs Th2 vs Tfh) incompletely defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Stochastic chromatin remodeling at a specific site (VA) in the IL-4 locus, requiring calcineurin/NFAT and an additional protein synthesis-dependent factor, explained the probabilistic nature of IL-4 expression at the single-cell level.\",\n      \"evidence\": \"Restriction enzyme accessibility assay with cyclosporin A and cycloheximide; single-cell cytokine capture\",\n      \"pmids\": [\"14975241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the cycloheximide-sensitive factor unknown\", \"Relationship between VA accessibility and in vivo Th2 commitment kinetics unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Crystal structures of all three IL-4 receptor ternary complexes (type I and type II with IL-4; type II with IL-13) provided the structural basis for shared and divergent signaling through γc vs IL-13Rα1, explaining differential potency and cell-type specificity.\",\n      \"evidence\": \"X-ray crystallography of IL-4Rα/γc/IL-4, IL-4Rα/IL-13Rα1/IL-4, and IL-4Rα/IL-13Rα1/IL-13 complexes with cell-based signaling assays\",\n      \"pmids\": [\"18243101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of full-length receptor with intracellular domains and associated JAKs\", \"Mechanism of differential JAK activation (JAK3 vs TYK2) at the structural level unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Conditional knockout studies revealed that IL-4 promotes tissue repair by directly acting on non-immune cells—hepatocytes for liver regeneration and resident macrophages for self-renewal—expanding its functional scope beyond classical immune regulation.\",\n      \"evidence\": \"Hepatocyte- and macrophage-specific IL-4Rα conditional knockouts in hepatectomy, toxin injury, and nematode infection models; BrdU/Ki67 proliferation assays\",\n      \"pmids\": [\"23716700\", \"24101381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular pathway mediating hepatocyte proliferation not fully characterized\", \"Whether IL-4-driven macrophage self-renewal contributes to tissue fibrosis in chronic settings unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mechanistic studies of negative regulation identified STUB1-mediated ubiquitination/degradation of IL-4Rα and Shp1-mediated STAT6 dephosphorylation as feedback mechanisms, while a transcription-independent pathway was shown to suppress NLRP3 inflammasome assembly by blocking ASC oligomerization and NLRP3 mitochondrial redistribution.\",\n      \"evidence\": \"STUB1 KO mice with elevated IL-4Rα and spontaneous airway inflammation; T cell-specific Shp1 deletion with sustained STAT6; NLRP3 reconstitution with ASC oligomerization assay in STAT6 KO cells\",\n      \"pmids\": [\"24251647\", \"23797092\", \"25601272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"STAT6-independent mechanism of NLRP3 suppression not molecularly identified\", \"Relative contributions of STUB1 vs lysosomal IL-4Rα degradation in different cell types unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"IL-4 was established as a neuroprotective and neuroregenerative cytokine: neuronal IL-4Rα signaling via AKT/MAPK and IRS1-PI3K-PKC pathways promotes axonal repair and functional recovery after CNS injury, independent of anti-inflammatory effects.\",\n      \"evidence\": \"Neuronal IL-4R conditional deletion in CNS injury and EAE models; intrathecal/nasal IL-4; pathway-level analysis of IRS1-PI3K-PKC and AKT/MAPK\",\n      \"pmids\": [\"25607842\", \"29491183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific neuronal target genes downstream of IL-4-induced PKC activation uncharacterized\", \"Whether neuronal IL-4R signaling is relevant in human neurological disease not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Eosinophil-derived IL-4 was shown to drive beige fat biogenesis through alternatively activated macrophage catecholamine production and cardiac fibrotic remodeling in autoimmune myocarditis, revealing organ-specific pathological and metabolic circuits of IL-4.\",\n      \"evidence\": \"Cold exposure in IL-4/13-deficient and eosinophil-deficient mice; eosinophil-specific IL-4 conditional deletion in myocarditis model; macrophage tyrosine hydroxylase/catecholamine measurements\",\n      \"pmids\": [\"24906148\", \"28302646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether beige fat IL-4 axis operates in adult humans is debated\", \"Direct catecholamine production by macrophages has been challenged by subsequent studies\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"IL-4 was found to programme immunosuppressive myeloid cells at the bone marrow progenitor stage, with basophil/eosinophil-derived IL-4 acting on granulocyte-monocyte progenitors via IL-4Rα to establish tumour-promoting myeloid transcriptional states.\",\n      \"evidence\": \"Progenitor-specific vs mature myeloid IL-4Rα conditional knockouts; scRNA-seq; basophil depletion; dupilumab clinical observation\",\n      \"pmids\": [\"38057662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether dupilumab-mediated tumour regression is reproducible across cancer types not established\", \"Epigenetic mechanism of progenitor imprinting by IL-4 uncharacterized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Spatial functional genomics demonstrated that tumour-derived IL-4 creates localized immunosuppressive niches by paracrine macrophage polarization, with loss of IL-4 in individual tumour clones producing immune-excluded microenvironments not compensated by neighbouring clones.\",\n      \"evidence\": \"Perturb-map spatial screen in ovarian cancer, IL-4 KO clones, anti-PD-1 therapy, TME macrophage phenotyping\",\n      \"pmids\": [\"39481380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Diffusion radius of IL-4 signaling in solid tumours not quantified\", \"Whether IL-4 niche architecture predicts immunotherapy response in patients unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the molecular identity of the STAT6-independent mechanism by which IL-4 suppresses NLRP3 inflammasome assembly, the structural basis of full-length receptor–JAK complex activation, and whether IL-4 progenitor programming in the bone marrow can be therapeutically targeted without compromising protective type 2 immunity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length IL-4Rα/JAK/STAT6 signaling complex\", \"STAT6-independent NLRP3 suppression mechanism unidentified\", \"Therapeutic window for blocking IL-4 in cancer vs preserving helminth immunity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 7, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [33, 34, 36, 39]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 7, 34, 37, 43, 44]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 7, 12, 23, 31, 34, 43, 44]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 10, 11, 25, 26, 36, 39]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 29, 30]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [6, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [15, 17, 18, 21, 22, 35]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"IL4R\",\n      \"IL2RG\",\n      \"IL13RA1\",\n      \"STAT6\",\n      \"STUB1\",\n      \"PTPN6\",\n      \"IRS1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}