{"gene":"CCL11","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":1996,"finding":"CCL11 (eotaxin) binds with high affinity and specificity to the chemokine receptor CCR3 (CKR-3), which is selectively expressed on eosinophils. Cells transfected with CCR3 cDNA bound radiolabeled eotaxin specifically and migrated in transwell chemotaxis assays to eotaxin, RANTES, and MCP-3, but not other chemokines.","method":"Radioligand binding assays, transwell chemotaxis assays, cDNA transfection, Northern blot","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 — reconstituted receptor-ligand binding in vitro with functional chemotaxis validation, foundational study","pmids":["8676064"],"is_preprint":false},{"year":1997,"finding":"CCR3, the eotaxin receptor, is selectively expressed by human Th2 (but not Th1) lymphocytes in addition to eosinophils and basophils. Eotaxin stimulated increases in intracellular calcium and chemotaxis of CCR3+ T cells.","method":"Flow cytometry, intracellular calcium flux assay, chemotaxis assay, antibody-based cell isolation","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays; replicated by independent labs","pmids":["9302298"],"is_preprint":false},{"year":1997,"finding":"CCR3 is functionally expressed by Th2-type T lymphocytes (not Th1) and mediates CCL11-induced calcium flux and migration; CCR3+ T lymphocytes co-localize with eosinophils at sites of allergic inflammation in vivo.","method":"cDNA library cloning, flow cytometry, calcium flux assay, chemotaxis assay, immunostaining of tissue sections","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including in vivo tissue localization and functional assays, confirmed by independent lab (PMID 9302298)","pmids":["9480044"],"is_preprint":false},{"year":1996,"finding":"Mouse CCR3 (renamed from MIP-1α receptor-like 2) is a functional eotaxin receptor: human and mouse eotaxin, but not other chemokines, induced transient increases in [Ca2+]i in HEK293 cells expressing the receptor; CCR3 RNA was abundant in primary eosinophils.","method":"Calcium flux assay in transfected cells, RT-PCR, radioligand binding","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution in transfected cells with functional readout, consistent with human CCR3 data","pmids":["8687456"],"is_preprint":false},{"year":1997,"finding":"CCL11 expression in lung epithelial cells is induced by TNF-α and IL-1β at the mRNA and protein level, and this induction is inhibited by the glucocorticoid dexamethasone. Cytokine-induced mRNA increases correlated with increased protein production and secretion.","method":"RT-PCR, ELISA, Northern blot, pharmacological inhibition with dexamethasone","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (mRNA + protein + functional secretion), correlated inhibition by dexamethasone","pmids":["9120022"],"is_preprint":false},{"year":1999,"finding":"CCL11 (eotaxin) induces phosphorylation and activation of p42/p44 MAP kinases (ERK1/2) in eosinophils; blockade of MAPK activation by PD98059 dramatically decreases CCL11-induced eosinophil rolling in vivo and chemotaxis in vitro, consistent with regulation of actin polymerization and rearrangement.","method":"Phosphorylation assays, MAPK inhibitor (PD98059), in vivo rolling assay, in vitro chemotaxis, actin polymerization assay","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo functional assays with pharmacological inhibition showing mechanistic pathway","pmids":["10415066"],"is_preprint":false},{"year":1999,"finding":"Human airway smooth muscle cells constitutively express CCL11, and expression is enhanced by TNF-α and IL-1β. CCL11 secreted from ASM cells acts as a chemoattractant for eosinophils; anti-CCL11 and anti-RANTES antibodies together inhibit >70% of eosinophil chemotaxis toward ASM supernatants.","method":"RT-PCR, immunocytochemistry, ELISA, chemotaxis assay, antibody neutralization","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with functional chemotaxis readout and antibody neutralization","pmids":["10351942"],"is_preprint":false},{"year":2001,"finding":"CCL11 (eotaxin) is a natural antagonist for CCR2 and an agonist for CCR5 in addition to its primary agonist activity at CCR3. Eotaxin displaces 125I-MCP-1 from monocytes, inhibits MCP-1-induced chemotaxis and enzyme release via CCR2, and induces CCR5 internalization but not CCR2 internalization.","method":"Radiolabeled ligand binding assays, calcium flux assay, chemotaxis assay, enzyme release assay, receptor internalization assay in monocytes and transfected cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal in vitro assays with transfected cells and primary monocytes, replicated across CCR2 and CCR5","pmids":["11264152"],"is_preprint":false},{"year":2001,"finding":"CCL11 (eotaxin) is a partial agonist of CCR2b: at 1 µM it induces chemotaxis of CCR2b transfectants and THP-1 cells (blocked by anti-CCR2 but not anti-CCR3), while sub-stimulatory concentrations inhibit MCP-1-induced chemotaxis and calcium flux through CCR2b. Eotaxin binds CCR2b with Kd = 7.50 nM vs 1.68 nM at CCR3.","method":"Chemotaxis assay, intracellular calcium flux, radioligand binding on CCR2b and CCR3 transfectants, antibody blocking","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — quantitative binding and functional assays in transfected cells with multiple readouts","pmids":["11559700"],"is_preprint":false},{"year":2001,"finding":"IL-13 upregulates CCL11 expression in airway epithelial cells (BEAS-2B) via a STAT6-dependent mechanism: IL-13 activates STAT6 nuclear binding to the eotaxin promoter, and mutation of the STAT6 binding site or use of a dominant-negative STAT6 abolishes IL-13-induced promoter activation and CCL11 protein secretion.","method":"RT-PCR, ELISA, promoter-luciferase reporter transfection, EMSA, site-directed mutagenesis, dominant-negative STAT6 cotransfection","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 1 — promoter mutagenesis + dominant-negative STAT6 + EMSA, multiple orthogonal methods in one study","pmids":["11415942"],"is_preprint":false},{"year":2001,"finding":"TNF-α and IL-4/IL-13 induce CCL11 (eotaxin-1) expression in fibroblasts through a STAT6-mediated transcriptional pathway. TNF-α inducibility requires STAT6 (shown by STAT6-defective HEK293 cells), involves a composite STAT6/NF-κB element, and a dominant-negative STAT6 inhibits TNF-α-induced CCL11 secretion in primary fibroblasts.","method":"Promoter-luciferase reporter assay, EMSA, cotransfection with STAT6 expression vectors, dominant-negative STAT6, ELISA","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 — promoter construct + mutagenesis + dominant-negative approach, multiple orthogonal methods","pmids":["11254707"],"is_preprint":false},{"year":2000,"finding":"IL-1β induces CCL11 (eotaxin) gene transcription in airway epithelial cells via an NF-κB site located 46 bp upstream from the transcriptional start site. Site-directed mutagenesis showed this NF-κB site is necessary and sufficient for IL-1β induction; p50 and p65 bind this site; and NF-κB inhibitors block IL-1β-induced CCL11 mRNA expression.","method":"Nuclear run-on transcription assay, promoter-luciferase reporter, site-directed mutagenesis, EMSA, supershift assay, NF-κB inhibitors, p65 overexpression","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 1 — promoter mutagenesis + EMSA + supershift + overexpression in one study","pmids":["11076795"],"is_preprint":false},{"year":2005,"finding":"TNF-α-induced CCL11 gene transcription in airway smooth muscle cells is mediated mainly by NF-κB (p65/p50), which induces selective histone H4 acetylation on lysines 5 and 12 at the CCL11 promoter. β2-Agonists and glucocorticoids inhibit CCL11 by blocking TNF-α-induced histone H4 acetylation and p65 binding to the promoter without affecting NF-κB nuclear translocation or in vitro DNA binding.","method":"Luciferase reporter assay, Western blot, EMSA, electrophoretic mobility supershift assay, chromatin immunoprecipitation (ChIP)","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 — ChIP assay directly demonstrating histone modification at CCL11 promoter + EMSA + luciferase","pmids":["15972682"],"is_preprint":false},{"year":2007,"finding":"CCL11 (eotaxin) binds selectively to immobilized heparin with high affinity (Kd = 1.23 × 10⁻⁸ M), but not to heparan sulfate or other GAGs. This interaction protects CCL11 from proteolysis by plasmin and indirectly by cathepsin G and elastase, and co-administration of CCL11 and heparin significantly enhances eosinophil recruitment in a mouse air-pouch model in vivo.","method":"Heparin affinity binding assay (Kd determination), protease protection assay, mouse air-pouch model in vivo, in vitro chemotaxis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — quantitative binding assay + protease assay + in vivo functional validation","pmids":["17384413"],"is_preprint":false},{"year":2014,"finding":"CCL11 undergoes bidirectional transport across the blood-brain barrier (BBB). The slow influx phase is explained by binding to cellular components in blood; the rapid uptake phase involves direct interactions with the BBB. A slow but saturable transport system exists from brain to blood. CCR3 did not facilitate CCL11 transport across the BBB. Transport does not disrupt BBB integrity.","method":"In vivo pharmacokinetic transport assay (multiple time regression), biphasic kinetics analysis, regional brain dissection, BBB disruption assay, pharmacological CCR3 blockade","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"High","confidence_rationale":"Tier 2 — direct in vivo transport quantification with multiple brain regions and mechanistic dissection of slow vs. rapid phases","pmids":["24706984"],"is_preprint":false},{"year":2014,"finding":"The structural basis of CCL11/eotaxin-1 recognition of CCR3 was determined: sulfotyrosine residues at positions in the CCR3 N-terminus (residues 8-23) form hydrophobic, salt bridge, and cation-π interactions with residues conserved in CC chemokines. Intact CCR3 is sulfated, and sulfation enhances receptor activity. The orientation of CCL11 relative to the receptor N-terminus differs from that of CXC chemokines.","method":"NMR structure determination, peptide binding assay with chemical shift mapping, receptor sulfation validation, functional receptor activity assay","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 — NMR structure of CCL11 bound to sulfotyrosine-containing CCR3 peptide with functional validation","pmids":["25450766"],"is_preprint":false},{"year":2004,"finding":"CCL11 induces CCR3-dependent smooth muscle cell (SMC) chemotaxis. CCR3 mRNA and protein are expressed in mouse aortic SMCs; CCL11-induced SMC migration in Boyden chamber and scrape-wound assay is blocked by anti-CCR3 (but not anti-CCR2) antibody. CCR3 and CCL11 are upregulated in medial and intimal SMCs after arterial injury.","method":"RT-PCR, Western blot, flow cytometry, Boyden chamber chemotaxis, scrape-wound assay, immunohistochemistry, antibody neutralization","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, antibody neutralization confirms CCR3 dependence","pmids":["15130922"],"is_preprint":false},{"year":2005,"finding":"CCL11 (eotaxin/CCL11) exerts direct profibrogenic effects on human lung fibroblasts via CCR3, which is constitutively expressed on these cells. CCL11 increases fibroblast proliferation, MMP-2 activity, and collagen synthesis, but not TGF-β1 release or myofibroblast differentiation. CCL11-enhanced fibroblast migration is completely inhibited by anti-CCR3 neutralizing antibodies.","method":"Flow cytometry, RT-PCR, Northern blot, proliferation assay (tritiated thymidine), chemotaxis (Boyden chamber), collagen synthesis (tritiated proline), gelatin zymography, ELISA, antibody neutralization","journal":"The Journal of allergy and clinical immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal assays with CCR3-neutralization confirming receptor dependence","pmids":["16387592"],"is_preprint":false},{"year":2004,"finding":"IL-9 induces CCL11/eotaxin-1 expression in human airway smooth muscle cells through STAT3 signaling (not STAT6 or STAT5). IL-9 induces STAT3 phosphorylation and STAT3 binding to the CCL11 promoter in vivo; dominant-negative STAT3β abolishes IL-9-induced CCL11 promoter activity; STAT3 siRNA reduces CCL11 mRNA.","method":"RT-PCR, ELISA, promoter-luciferase reporter, ChIP assay (STAT3 binding to promoter), dominant-negative constructs, siRNA knockdown","journal":"Journal of immunology (Baltimore, Md. : 1950) / PloS one","confidence":"High","confidence_rationale":"Tier 1 — ChIP + promoter reporter + dominant-negative + siRNA in one study series","pmids":["15294996","20169197"],"is_preprint":false},{"year":2012,"finding":"CCL11 stimulates piecemeal degranulation of eosinophil-associated RNases (EARs) from mouse eosinophils in vitro (EC50 5 nM via CCR3). Cell-free eosinophil granules express functional CCR3 receptors and secrete EAR and eosinophil peroxidase in response to CCL11.","method":"RNase enzymatic activity assay, electron microscopy (ultrastructure), in vitro eosinophil stimulation, mouse model of allergic airway inflammation","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — functional secretion assay with ultrastructural validation, novel finding of CCR3 on cell-free granules","pmids":["22294786"],"is_preprint":false},{"year":2012,"finding":"STAT6 binding to the eotaxin-3 promoter is blocked by omeprazole in EoE esophageal cells, explaining PPI-mediated suppression of IL-4-stimulated CCL11 (eotaxin) family production. Omeprazole had no effect on STAT6 phosphorylation or nuclear translocation but blocked binding of STAT6, RNA polymerase II, and trimethylated H3K4 to the eotaxin-3 promoter.","method":"ChIP assay (STAT6, RNA Pol II, H3K4me3), Western blot (STAT6 phosphorylation, nuclear translocation), ELISA, RT-PCR, promoter reporter construct","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — ChIP directly shows promoter-level mechanism with multiple histone/factor readouts","pmids":["23185525"],"is_preprint":false},{"year":2011,"finding":"CCL11 promotes survival of anaplastic large cell lymphoma (ALCL) cells via autocrine CCR3 signaling and ERK1/2 phosphorylation, inducing expression of anti-apoptotic proteins Bcl-xL and survivin. ERK1/2 inhibition completely blocked CCL11-mediated cell survival and tumor proliferation.","method":"Cell survival assay, proliferation assay, ERK1/2 phosphorylation (Western blot), ERK inhibitor, in vivo tumor growth, immunostaining","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple functional assays with pathway inhibition in vitro and in vivo validation","pmids":["21406396"],"is_preprint":false},{"year":2012,"finding":"TGF-β1 synergizes with IL-13 to increase CCL11 expression in airway fibroblasts by augmenting STAT6 phosphorylation, nuclear translocation, and binding to the CCL11 promoter. TGF-β1 activates the MEK/ERK pathway to reduce IL-13Rα2 (the decoy receptor), thereby overcoming IL-13's autoregulatory feedback and enhancing STAT6-dependent CCL11 transcription.","method":"Nuclear run-on transcription assay, mRNA stability assay, STAT6 siRNA, promoter ChIP, Western blot (STAT6 phosphorylation and translocation), MEK/ERK inhibitor, IL-13Rα2 expression analysis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 — transcriptional and post-transcriptional assays + ChIP + siRNA + pharmacological inhibition in one study","pmids":["22573806"],"is_preprint":false},{"year":2017,"finding":"FGF21 acts on adipocytes in an autocrine manner to promote CCL11 expression and secretion via ERK1/2 activation, which drives eosinophil recruitment into subcutaneous white adipose tissue, leading to M2 macrophage accumulation and beige adipocyte biogenesis. CCL11 neutralization blocks FGF21-induced type 2 immune responses and beiging.","method":"Conditional knockout mice (adipose-specific FGF21 and β-Klotho ablation), CCL11 neutralization, ERK1/2 activation assay, eosinophil/macrophage quantification, adipocyte differentiation assays, CCL11 replenishment rescue","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + neutralization rescue + multiple cellular readouts in vivo","pmids":["28844880"],"is_preprint":false},{"year":2009,"finding":"CCL11 signaling in ovarian carcinoma cells (via CCR2, CCR3, CCR5) stimulates proliferation and migration/invasion and activates ERK1/2, MEK1, and STAT3 phosphorylation. Neutralizing antibodies against CCR2, CCR3, and CCR5 inhibit CCL11-stimulated growth and invasion.","method":"Proliferation assay, migration/invasion assay, antibody neutralization, phosphoprotein analysis (ERK1/2, MEK1, STAT3), ELISA","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — receptor antibody neutralization with multiple functional readouts; single lab","pmids":["19351767"],"is_preprint":false},{"year":2003,"finding":"OSM (oncostatin M) induces CCL11 production in fibroblasts via partial dependence on ERK1/2 and p38 MAPK signaling (not STAT3 alone); pharmacological inhibitors of ERK (PD98059) and p38 (SB203580) partially reduce OSM-induced CCL11 production in NIH 3T3 cells.","method":"ELISA, RT-PCR, Western blot (STAT3, ERK, p38 phosphorylation), pharmacological inhibitors, adenoviral OSM overexpression in vivo","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological pathway dissection with in vitro and in vivo data; signaling inhibitors give partial blockade","pmids":["12496442"],"is_preprint":false},{"year":2001,"finding":"Genetic epistasis in mice shows that eotaxin (CCL11) overexpression in intestinal enterocytes drives gastrointestinal eosinophilia via a β7 integrin-dependent mechanism; genetic rescue (eotaxin transgene in eotaxin-deficient mice) restores gastrointestinal eosinophil levels, while β7-integrin blockade prevents accumulation.","method":"Transgenic mice (enterocyte-specific eotaxin expression), eotaxin gene-targeted mice with transgenic rescue, eosinophil quantification, β7 integrin blockade","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic rescue in KO mice + integrin-blocking experiments establish pathway position","pmids":["11733500"],"is_preprint":false},{"year":2005,"finding":"Genetic deletion of eotaxin-1 (CCL11) and eotaxin-2 together in mice (DKO) causes a marked decrease in pulmonary tissue eosinophilia in OVA-challenged asthma models, approaching the low levels seen in CCR3-deficient mice. Individual eotaxin-1 or eotaxin-2 deletion has modest effects, indicating synergistic and non-redundant roles in CCR3-mediated eosinophil recruitment.","method":"Targeted gene deletion (single and double KO), allergen-challenge asthma model, eosinophil quantification in BAL and tissue, CCR3-deficient mice comparison","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis using multiple KO combinations with defined in vivo phenotypic readouts","pmids":["16210640"],"is_preprint":false},{"year":2011,"finding":"In airway smooth muscle cells, dimethylfumarate (DMF) inhibits NF-κB-dependent CCL11 (eotaxin) secretion by inducing IκBα glutathionylation (IκBα-SSG), which prevents IκBα degradation, NF-κB p65 nuclear entry, and NF-κB/DNA binding; DMF also inhibits phosphorylation of histone H3 via MSK-1 inhibition. These effects are reversed by glutathione-OEt.","method":"ELISA, EMSA, immunofluorescence, co-immunoprecipitation, immunoblotting (IκBα-SSG, p65, p-H3)","journal":"The European respiratory journal","confidence":"Medium","confidence_rationale":"Tier 2 — multiple molecular assays with pharmacological rescue; single lab","pmids":["21719482"],"is_preprint":false},{"year":2003,"finding":"Eotaxin (CCL11) and IL-5 activate overlapping signal transduction pathways for eosinophil shape change, including MAPK, p38 MAPK, intracellular Ca2+, and PKA, but CCL11-induced shape change does not require PKC, which is required for IL-5-induced shape change and associated ERK1/2 activation.","method":"Gated autofluorescence/forward-scatter shape change assay, pharmacological inhibitors (MAPK, p38, Ca2+ depletion, PKA, PTK, PKC), ERK1/2 phosphorylation assay","journal":"Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological pathway dissection with multiple inhibitors; specific PKC difference between CCL11 and IL-5 pathways established","pmids":["12562334"],"is_preprint":false},{"year":2024,"finding":"In pancreatic cancer, ATX-LPA signaling suppresses CCL11 expression via inhibition of the AP-1 transcription factor c-Jun; ATX inhibition de-represses CCL11, increasing eosinophil accumulation in the tumor microenvironment. CCL11 neutralization reversed eosinophil accumulation caused by ATX inhibition, placing CCL11 downstream of ATX-LPA-c-Jun in this autocrine feedback loop.","method":"Genetic ATX inhibition (knockout), pharmacological ATX inhibition, CCL11 neutralization, eosinophil quantification, c-Jun activity assay, gene expression analysis, human PDAC specimen analysis","journal":"Nature cancer","confidence":"High","confidence_rationale":"Tier 2 — genetic + pharmacological + neutralization approaches, multiple orthogonal methods establishing pathway position","pmids":["38195933"],"is_preprint":false},{"year":2011,"finding":"CCL11 induces MMP-3 mRNA expression in human chondrocytes via ERK and p38 kinase pathways (inhibited by ERK and p38 inhibitors), while MMP-3 protein secretion is regulated by PLC-PKC cascade and JNK/MAP kinase pathways. cAMP/PKA pathway antagonizes CCL11-induced MMP-3 expression, and these effects are mediated through G protein-coupled CCL11 receptor activity.","method":"RT-PCR, pharmacological inhibitors (ERK, p38, PKA, PKC, JNK, PLC), ELISA, Western blot","journal":"Journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 3 — pharmacological pathway dissection without genetic confirmation; single lab","pmids":["22114952"],"is_preprint":false},{"year":2022,"finding":"Brg1 (a chromatin remodeling protein) directly binds to the proximal CCL11 promoter and activates its transcription by interacting with NF-κB/RelA. NF-κB knockdown or inhibition disrupts Brg1 recruitment to the CCL11 promoter and blocks CCL11 induction in hepatocytes during liver regeneration.","method":"ChIP assay (Brg1 promoter binding), NF-κB knockdown, pharmaceutical NF-κB inhibition, liver-specific Brg1 knockout, adenoviral CCL11 overexpression, quantitative PCR, ELISA","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1 — ChIP showing direct promoter binding + conditional KO + rescue experiment","pmids":["35614068"],"is_preprint":false},{"year":2023,"finding":"CCL11 promotes hepatic stellate cell (HSC) activation and liver fibrosis: CCL11 levels are elevated in HSCs from fibrotic mice and induced by TGF-β and PDGF. Zinc finger factor 281 binds the CCL11 promoter and mediates its trans-activation. CCL11 regulates HSC activation by stimulating Jagged 1 transcription; CCL11-/- or HSC-specific CCL11 knockdown mitigates fibrogenesis, and CCR3 antagonism or anti-CCL11 neutralizing antibodies ameliorate liver fibrosis.","method":"ChIP (ZNF281 promoter binding), RNA sequencing, CCL11-/- global KO, HSC-specific conditional knockdown, CCR3 antagonist, anti-CCL11 neutralizing antibodies, Jagged 1 reconstitution, ELISA, qPCR","journal":"Hepatology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1 — ChIP + global and cell-specific KO + mechanistic target identification (Jagged 1) + multiple therapeutic rescue approaches","pmids":["36651177"],"is_preprint":false},{"year":2023,"finding":"CCL11 promotes reactive oxygen species (ROS) production and DNA damage response (DDR) activation (p-TP53, γH2AX) in lung fibroblasts, leading to cellular senescence and increased secretion of senescence-associated secretory phenotype (SASP) cytokines IL-6 and IL-8.","method":"ROS assay, DNA damage response markers (Western blot: p-TP53, γH2AX), senescence assay, SASP cytokine ELISA, in silico target analysis (PseudoCell), gene expression in asthmatic airway epithelial cells","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple molecular readouts of senescence mechanism; single lab with in vitro + clinical data","pmids":["37860000"],"is_preprint":false},{"year":2017,"finding":"CCL11 promotes migration and proliferation of mouse neural progenitor cells (NPCs) in vitro; these effects are partly inhibited by the CCR3 antagonist SB297006. In neonatal hypoxic-ischemic injury, NPCs migrate toward injured areas where CC chemokines including CCL11 are markedly elevated.","method":"Migration assay, proliferation assay, CCR3 antagonist (SB297006), neonatal mouse hypoxic-ischemic brain injury model, chemokine quantification","journal":"Stem cell research & therapy","confidence":"Medium","confidence_rationale":"Tier 3 — functional assays with pharmacological CCR3 blockade; mechanistic link to CCR3 is partial","pmids":["28173860"],"is_preprint":false},{"year":2017,"finding":"In human umbilical vein endothelial cells (HUVECs), CCL11-CCR3 interaction activates the PI3K/Akt signaling pathway (not ERK1/2), promoting endothelial cell migration and angiogenesis. CCR3 siRNA knockdown reduces PI3K phosphorylation, and PI3K inhibitors abolish CCL11-induced Akt phosphorylation.","method":"Scratch wound assay, MTS proliferation assay, rat aortic ring sprouting assay, siRNA knockdown of CCR3, PI3K inhibitors, Western blot (Akt, ERK1/2 phosphorylation)","journal":"Journal of receptor and signal transduction research","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA knockdown + pharmacological inhibition with functional angiogenesis readout; single lab","pmids":["28279120"],"is_preprint":false},{"year":2013,"finding":"Myeloid cell-specific NF-κB/RelA (p65) regulates CCL11 expression and intestinal eosinophilic inflammation: DSS-induced CCL11 expression, eosinophilic inflammation, and histopathology are attenuated in RelA/p65(Δmye) mice. Calprotectin (S100a8/S100a9) induces CCL11 production from macrophages via a p65-dependent mechanism.","method":"Conditional myeloid-specific p65 knockout, DSS colitis model, STAT6-/- comparison, LPS stimulation of bone marrow-derived macrophages, gene array analysis, immunofluorescence, flow cytometry","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined cellular and molecular phenotype, epistasis with STAT6 pathway","pmids":["23562811"],"is_preprint":false},{"year":2021,"finding":"CCL11 promotes CCR3-dependent self-amplifying expression in RA fibroblast-like synoviocytes (FLS): CCL11 induces its own mRNA and CCR3 mRNA expression; TNF-α induces CCL11/CCR3 expression; CCR3 antagonist reduces TNF-α-induced CCL11 secretion; CCL11 induces migration of RA FLS and monocytes; CCL11 siRNA reduces FLS migration.","method":"ELISA, immunofluorescence, quantitative PCR, CCR3 antagonist, CCL11 siRNA, migration assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA + antagonist + functional migration assay; single lab, moderate evidence for autocrine loop","pmids":["33846499"],"is_preprint":false},{"year":2021,"finding":"CCL11 exacerbates DSS-induced colitis and colitis-associated tumorigenesis in mice: Ccl11-/- mice show decreased colon tumor number and burden, histologic injury, and eosinophil infiltration versus WT. Bone marrow chimera experiments showed that both hematopoietic- and epithelial cell-derived CCL11 are important for tumorigenesis.","method":"Ccl11-/- mice, DSS colitis model, AOM-DSS carcinogenesis model, bone marrow chimera, histology, eosinophil quantification","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — KO mice + bone marrow chimera experiments, defined in vivo phenotypic readouts","pmids":["34625710"],"is_preprint":false},{"year":2021,"finding":"Circulating CCL11 (eotaxin-1) mediates age-related cognitive decline: neutralizing anti-CCL11 antibody in standard-housed aged mice produces EE-like improvements in spatial memory, hippocampal neurogenesis, and microglial activation; conversely, interfering with CCL11 reduction during environmental enrichment ablates its beneficial effects.","method":"Anti-CCL11 neutralizing antibody treatment, environmental enrichment, hippocampal neurogenesis quantification, spatial memory testing, microglial activation assessment, ribosomal S6 activation","journal":"Brain, behavior, and immunity","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function (neutralization) and gain-of-function (interference with CCL11 reduction) experiments with defined mechanistic and behavioral readouts","pmids":["34418501"],"is_preprint":false},{"year":2014,"finding":"Elevated CCL11 levels in the tumor microenvironment suppress dendritic cell differentiation/maturation, skewing toward a Th2 immune response and impairing CD8+ T cell-mediated tumor lysis. Myeloid IKKβ loss in macrophages reduces MHC class II expression and enhances CCL11 production, promoting melanoma growth.","method":"Myeloid-specific IKKβ knockout mice, allograft tumor models, macrophage depletion, CD8+ T cell depletion, serum/tissue CCL11 measurement, flow cytometry (MHC II, DC maturation)","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with depletion experiments and defined immunological readouts; single lab","pmids":["25336190"],"is_preprint":false}],"current_model":"CCL11 (eotaxin-1) functions primarily as a CC chemokine that binds with high affinity to CCR3 (and also partially to CCR2 and CCR5), activating G protein-coupled downstream pathways including ERK1/2, p38 MAPK, PI3K/Akt, STAT3, and intracellular Ca2+ flux to drive eosinophil chemotaxis, degranulation, and recruitment via haptotactic gradients stabilized by selective heparin binding; its transcription is regulated by NF-κB (IL-1β/TNF-α axis), STAT6 (IL-4/IL-13 axis), and STAT3 (IL-9 axis) at the CCL11 promoter, with histone H4 acetylation as an additional epigenetic control point, and it additionally acts on non-hematopoietic cells including smooth muscle cells, fibroblasts, and endothelial cells to promote migration, fibrogenesis, and angiogenesis, crosses the blood-brain barrier via saturable transport to regulate hippocampal neurogenesis, and participates in adipose tissue beiging, liver fibrosis via Jagged 1, and tumor immune modulation through context-dependent interactions with its receptors CCR3, CCR2, and CCR5."},"narrative":{"teleology":[{"year":1996,"claim":"Identification of CCR3 as the high-affinity eotaxin receptor on eosinophils established CCL11 as a selective chemoattractant acting through a specific GPCR, resolving the receptor identity question.","evidence":"Radioligand binding and transwell chemotaxis with CCR3-transfected cells and primary eosinophils","pmids":["8676064","8687456"],"confidence":"High","gaps":["No crystal/cryo-EM structure of the full CCL11–CCR3 complex at this time","Downstream intracellular signaling pathways uncharacterized"]},{"year":1997,"claim":"Demonstration that CCR3 is expressed on Th2 (but not Th1) lymphocytes expanded CCL11's target cell repertoire beyond eosinophils and linked it to adaptive Th2 immunity at sites of allergic inflammation.","evidence":"Flow cytometry, calcium flux, chemotaxis assays, and immunostaining of allergic tissue sections","pmids":["9302298","9480044"],"confidence":"High","gaps":["Whether CCL11 directly polarizes T cell responses or only recruits pre-existing Th2 cells","Relative contribution of CCL11 vs. other CCR3 ligands to Th2 recruitment in vivo"]},{"year":1999,"claim":"CCL11 was shown to activate ERK1/2 MAPK to drive eosinophil rolling, chemotaxis, and actin remodeling, establishing the first intracellular signaling mechanism downstream of CCR3.","evidence":"MAPK phosphorylation assays, PD98059 inhibitor, in vivo rolling assay, and in vitro chemotaxis","pmids":["10415066"],"confidence":"High","gaps":["Role of parallel pathways (p38, PI3K, calcium) not yet dissected for eosinophils","Mechanism linking ERK to actin polymerization not resolved"]},{"year":2000,"claim":"Mapping the NF-κB site at −46 bp in the CCL11 promoter as necessary and sufficient for IL-1β induction defined the first transcription factor controlling CCL11 expression.","evidence":"Promoter mutagenesis, EMSA with p50/p65 supershift, NF-κB inhibitors, nuclear run-on assay in airway epithelial cells","pmids":["11076795"],"confidence":"High","gaps":["Whether NF-κB cooperates with other factors for full CCL11 induction","Chromatin-level regulation not yet examined"]},{"year":2001,"claim":"Discovery that CCL11 acts as a natural antagonist at CCR2 and an agonist at CCR5 revealed cross-receptor pharmacology that enables CCL11 to modulate monocyte function beyond eosinophil-specific signaling.","evidence":"Radioligand displacement, calcium flux, chemotaxis, enzyme release, and receptor internalization assays on monocytes and transfected cells","pmids":["11264152","11559700"],"confidence":"High","gaps":["Physiological relevance of CCR2 antagonism vs. CCR3 agonism in vivo","Structural basis for partial agonism at CCR2"]},{"year":2001,"claim":"STAT6 was established as a master transcriptional regulator of CCL11 expression downstream of IL-4/IL-13, with composite STAT6/NF-κB elements mediating cytokine-induced transcription in epithelial cells and fibroblasts.","evidence":"Promoter-luciferase reporters, STAT6 site mutagenesis, dominant-negative STAT6, EMSA, ELISA in BEAS-2B cells and primary fibroblasts","pmids":["11415942","11254707"],"confidence":"High","gaps":["Relative contribution of STAT6 vs. NF-κB to CCL11 induction in different cell types","Epigenetic co-regulation not yet addressed"]},{"year":2001,"claim":"Genetic epistasis in transgenic and knockout mice demonstrated that enterocyte-derived CCL11 is sufficient to drive gastrointestinal eosinophilia via β7 integrin, establishing CCL11 as a non-redundant tissue-homing signal.","evidence":"Enterocyte-specific CCL11 transgene in eotaxin-KO mice with β7 integrin blockade","pmids":["11733500"],"confidence":"High","gaps":["Whether heparin/GAG binding in the gut modulates CCL11 gradient formation","Roles of eotaxin-2 and eotaxin-3 in compensating for CCL11 loss"]},{"year":2004,"claim":"IL-9 was shown to induce CCL11 via STAT3 (not STAT6 or STAT5), revealing a third independent transcription factor axis at the CCL11 promoter and broadening the cytokine inputs controlling its expression.","evidence":"ChIP (STAT3 binding to CCL11 promoter), dominant-negative STAT3β, STAT3 siRNA, promoter-luciferase in airway smooth muscle cells","pmids":["15294996","20169197"],"confidence":"High","gaps":["Whether STAT3 and STAT6 binding to the CCL11 promoter is cooperative or mutually exclusive","In vivo relevance of IL-9–STAT3–CCL11 axis in asthma"]},{"year":2005,"claim":"TNF-α–induced CCL11 transcription was linked to selective histone H4 acetylation (K5/K12) at the CCL11 promoter, providing the first epigenetic mechanism and explaining how glucocorticoids and β2-agonists suppress CCL11 at the chromatin level.","evidence":"ChIP for histone H4 acetylation and p65 binding, EMSA, luciferase reporter in airway smooth muscle cells","pmids":["15972682"],"confidence":"High","gaps":["Identity of the histone acetyltransferase(s) responsible","Whether histone modifications differ between cell types"]},{"year":2005,"claim":"Double knockout of CCL11 and eotaxin-2 in mice reduced pulmonary eosinophilia to near CCR3-KO levels, demonstrating synergistic and non-redundant roles of the two eotaxins in allergic airway inflammation.","evidence":"Single and double eotaxin-KO mice, OVA-challenge asthma model, comparison with CCR3-KO","pmids":["16210640"],"confidence":"High","gaps":["Contribution of eotaxin-3 (CCL26) to residual eosinophilia","Whether temporal expression differences explain synergy"]},{"year":2007,"claim":"CCL11 was found to bind heparin with high affinity and selectivity, protecting it from proteolysis and enhancing eosinophil recruitment in vivo — establishing a haptotactic gradient mechanism for tissue-level chemotaxis.","evidence":"Heparin affinity binding (Kd measurement), protease protection assays, mouse air-pouch model","pmids":["17384413"],"confidence":"High","gaps":["Whether heparin binding alters CCL11 conformation or receptor engagement","Tissue-specific GAG composition effects on gradient formation"]},{"year":2012,"claim":"CCL11 was shown to stimulate piecemeal degranulation of eosinophil granule contents via CCR3, including the finding that cell-free granules express functional CCR3, revealing an extracellular signaling mode for CCL11.","evidence":"RNase activity assay, electron microscopy, eosinophil stimulation with CCL11 (EC50 5 nM)","pmids":["22294786"],"confidence":"High","gaps":["How CCR3 is maintained on cell-free granule membranes","Downstream signaling in cell-free granules"]},{"year":2014,"claim":"NMR structural determination of CCL11 bound to the sulfotyrosine-containing CCR3 N-terminus revealed the molecular basis of receptor recognition, including salt bridge and cation-π interactions distinct from CXC chemokine binding modes.","evidence":"NMR structure, chemical shift mapping, sulfotyrosine peptide binding, receptor sulfation validation","pmids":["25450766"],"confidence":"High","gaps":["Full-length CCR3 complex structure in lipid environment not solved","Structural basis for partial agonism at CCR2 unknown"]},{"year":2014,"claim":"CCL11 was demonstrated to cross the blood-brain barrier via a saturable transport system independent of CCR3, establishing it as a blood-borne signal capable of directly accessing the CNS.","evidence":"In vivo pharmacokinetic transport assay with multiple time regression, regional brain dissection, CCR3 blockade","pmids":["24706984"],"confidence":"High","gaps":["Molecular identity of the BBB transporter","Whether transport is regulated by aging or disease"]},{"year":2017,"claim":"FGF21–ERK1/2 signaling in adipocytes was shown to induce CCL11 secretion that recruits eosinophils to drive M2 macrophage polarization and beige fat biogenesis, placing CCL11 as a metabolic effector beyond classical immunity.","evidence":"Adipose-specific FGF21 and β-Klotho KO mice, CCL11 neutralization and replenishment rescue, ERK1/2 activation","pmids":["28844880"],"confidence":"High","gaps":["Whether CCL11-driven beiging contributes to systemic energy expenditure in humans","Relative importance of CCL11 vs. other eosinophil chemoattractants in adipose tissue"]},{"year":2021,"claim":"Anti-CCL11 neutralizing antibodies in aged mice improved hippocampal neurogenesis and spatial memory, establishing circulating CCL11 as a causal mediator of age-related cognitive decline.","evidence":"Anti-CCL11 antibody treatment, environmental enrichment, hippocampal neurogenesis and behavioral testing in aged mice","pmids":["34418501"],"confidence":"High","gaps":["Cell type(s) in hippocampus directly responding to CCL11","Whether CCL11 acts through CCR3 in the brain or via an alternative receptor"]},{"year":2023,"claim":"CCL11 was identified as a direct activator of hepatic stellate cells that promotes liver fibrosis by inducing Jagged 1 transcription, with ZNF281 mediating CCL11 trans-activation at its own promoter — extending CCL11's fibrogenic role to the liver.","evidence":"ChIP (ZNF281), CCL11-KO mice, HSC-specific knockdown, CCR3 antagonist, anti-CCL11 antibodies, Jagged 1 reconstitution","pmids":["36651177"],"confidence":"High","gaps":["Whether Jagged 1–Notch signaling fully accounts for CCL11's fibrogenic activity","Whether hepatic CCL11–CCR3 axis is targetable without compromising immune defense"]},{"year":2024,"claim":"In pancreatic cancer, ATX-LPA signaling was found to suppress CCL11 expression via c-Jun inhibition, with ATX blockade de-repressing CCL11 and increasing tumor eosinophil infiltration — positioning CCL11 as a downstream effector in lipid-mediated tumor immune evasion.","evidence":"ATX knockout and pharmacological inhibition, CCL11 neutralization, c-Jun activity assay, human PDAC specimens","pmids":["38195933"],"confidence":"High","gaps":["Whether eosinophils recruited by CCL11 are tumoricidal or pro-tumorigenic in PDAC","Generalizability to other solid tumors"]},{"year":null,"claim":"Key unresolved questions include the molecular identity of the CCL11 BBB transporter, the full-length structure of the CCL11–CCR3 signaling complex in a membrane environment, and whether CCL11's pro-fibrogenic, pro-senescence, and anti-neurogenic activities share a common downstream effector pathway or represent context-dependent divergent signaling.","evidence":"","pmids":[],"confidence":"Low","gaps":["BBB transporter identity unknown","No full-length CCL11–CCR3 membrane complex structure","Unified mechanism linking fibrogenesis, senescence, and neurogenesis suppression not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,7,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,8]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[4,6,13,14,23]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2,19,26,27,37]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,21,24,36]}],"complexes":[],"partners":["CCR3","CCR2","CCR5","RELA","STAT6","STAT3","JAG1","ZNF281"],"other_free_text":[]},"mechanistic_narrative":"CCL11 (eotaxin-1) is a CC chemokine that functions as a central mediator of eosinophil recruitment and activation, with broader roles in tissue remodeling, neurogenesis regulation, fibrogenesis, and tumor immune modulation. CCL11 signals primarily through CCR3 — and also acts as a partial agonist at CCR2 and an agonist at CCR5 — to activate ERK1/2, p38 MAPK, PI3K/Akt, STAT3, and intracellular calcium flux, driving chemotaxis, degranulation, proliferation, and survival in eosinophils, smooth muscle cells, fibroblasts, endothelial cells, and tumor cells [PMID:8676064, PMID:10415066, PMID:11264152, PMID:28279120, PMID:11559700]. CCL11 transcription is controlled by NF-κB (p65/p50) in response to TNF-α/IL-1β, by STAT6 downstream of IL-4/IL-13, and by STAT3 downstream of IL-9, with chromatin remodeling via selective histone H4 acetylation and Brg1 recruitment at the CCL11 promoter [PMID:11076795, PMID:11415942, PMID:15294996, PMID:15972682, PMID:35614068]. CCL11 undergoes bidirectional saturable transport across the blood-brain barrier and, as a circulating factor, inhibits hippocampal neurogenesis during aging; it also drives hepatic stellate cell activation and liver fibrosis through Jagged 1 induction, promotes adipose tissue beiging via eosinophil-mediated type 2 immunity, and modulates the tumor immune microenvironment by suppressing dendritic cell maturation and CD8+ T cell responses [PMID:24706984, PMID:34418501, PMID:36651177, PMID:28844880, PMID:25336190]."},"prefetch_data":{"uniprot":{"accession":"P51671","full_name":"Eotaxin","aliases":["C-C motif chemokine 11","Eosinophil chemotactic protein","Small-inducible cytokine A11"],"length_aa":97,"mass_kda":10.7,"function":"Chemokine that plays a central role in both allergic and non-allergic inflammatory reactions by inducing the migration of different leukocyte types including eosinophils, basophils, macrophages and dendritic cells (PubMed:8597956, PubMed:33846499). Exerts its effects primarily by binding to the CCR3 receptor (PubMed:8631813). Induces also chemotaxis of endothelial cells and promotes angiogenesis by activating the PI3K/Akt pathway (PubMed:28279120)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P51671/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CCL11","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CCL11","total_profiled":1310},"omim":[{"mim_id":"609423","title":"HUMAN IMMUNODEFICIENCY VIRUS TYPE 1, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/609423"},{"mim_id":"607714","title":"TNFAIP3-INTERACTING PROTEIN 1; TNIP1","url":"https://www.omim.org/entry/607714"},{"mim_id":"606496","title":"INTERLEUKIN 17F; IL17F","url":"https://www.omim.org/entry/606496"},{"mim_id":"605658","title":"INTERLEUKIN 25; IL25","url":"https://www.omim.org/entry/605658"},{"mim_id":"604697","title":"CHEMOKINE, CC MOTIF, LIGAND 26; CCL26","url":"https://www.omim.org/entry/604697"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":42.9},{"tissue":"lymphoid tissue","ntpm":29.6},{"tissue":"stomach 1","ntpm":33.1},{"tissue":"urinary bladder","ntpm":38.2}],"url":"https://www.proteinatlas.org/search/CCL11"},"hgnc":{"alias_symbol":["eotaxin","MGC22554"],"prev_symbol":["SCYA11"]},"alphafold":{"accession":"P51671","domains":[{"cath_id":"2.40.50.40","chopping":"32-97","consensus_level":"medium","plddt":92.4439,"start":32,"end":97}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51671","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51671-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51671-F1-predicted_aligned_error_v6.png","plddt_mean":86.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CCL11","jax_strain_url":"https://www.jax.org/strain/search?query=CCL11"},"sequence":{"accession":"P51671","fasta_url":"https://rest.uniprot.org/uniprotkb/P51671.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51671/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51671"}},"corpus_meta":[{"pmid":"10079098","id":"PMC_10079098","title":"Pulmonary 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selectively expressed on eosinophils. Cells transfected with CCR3 cDNA bound radiolabeled eotaxin specifically and migrated in transwell chemotaxis assays to eotaxin, RANTES, and MCP-3, but not other chemokines.\",\n      \"method\": \"Radioligand binding assays, transwell chemotaxis assays, cDNA transfection, Northern blot\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted receptor-ligand binding in vitro with functional chemotaxis validation, foundational study\",\n      \"pmids\": [\"8676064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CCR3, the eotaxin receptor, is selectively expressed by human Th2 (but not Th1) lymphocytes in addition to eosinophils and basophils. Eotaxin stimulated increases in intracellular calcium and chemotaxis of CCR3+ T cells.\",\n      \"method\": \"Flow cytometry, intracellular calcium flux assay, chemotaxis assay, antibody-based cell isolation\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays; replicated by independent labs\",\n      \"pmids\": [\"9302298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CCR3 is functionally expressed by Th2-type T lymphocytes (not Th1) and mediates CCL11-induced calcium flux and migration; CCR3+ T lymphocytes co-localize with eosinophils at sites of allergic inflammation in vivo.\",\n      \"method\": \"cDNA library cloning, flow cytometry, calcium flux assay, chemotaxis assay, immunostaining of tissue sections\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including in vivo tissue localization and functional assays, confirmed by independent lab (PMID 9302298)\",\n      \"pmids\": [\"9480044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Mouse CCR3 (renamed from MIP-1α receptor-like 2) is a functional eotaxin receptor: human and mouse eotaxin, but not other chemokines, induced transient increases in [Ca2+]i in HEK293 cells expressing the receptor; CCR3 RNA was abundant in primary eosinophils.\",\n      \"method\": \"Calcium flux assay in transfected cells, RT-PCR, radioligand binding\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution in transfected cells with functional readout, consistent with human CCR3 data\",\n      \"pmids\": [\"8687456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CCL11 expression in lung epithelial cells is induced by TNF-α and IL-1β at the mRNA and protein level, and this induction is inhibited by the glucocorticoid dexamethasone. Cytokine-induced mRNA increases correlated with increased protein production and secretion.\",\n      \"method\": \"RT-PCR, ELISA, Northern blot, pharmacological inhibition with dexamethasone\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (mRNA + protein + functional secretion), correlated inhibition by dexamethasone\",\n      \"pmids\": [\"9120022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CCL11 (eotaxin) induces phosphorylation and activation of p42/p44 MAP kinases (ERK1/2) in eosinophils; blockade of MAPK activation by PD98059 dramatically decreases CCL11-induced eosinophil rolling in vivo and chemotaxis in vitro, consistent with regulation of actin polymerization and rearrangement.\",\n      \"method\": \"Phosphorylation assays, MAPK inhibitor (PD98059), in vivo rolling assay, in vitro chemotaxis, actin polymerization assay\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo functional assays with pharmacological inhibition showing mechanistic pathway\",\n      \"pmids\": [\"10415066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human airway smooth muscle cells constitutively express CCL11, and expression is enhanced by TNF-α and IL-1β. CCL11 secreted from ASM cells acts as a chemoattractant for eosinophils; anti-CCL11 and anti-RANTES antibodies together inhibit >70% of eosinophil chemotaxis toward ASM supernatants.\",\n      \"method\": \"RT-PCR, immunocytochemistry, ELISA, chemotaxis assay, antibody neutralization\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with functional chemotaxis readout and antibody neutralization\",\n      \"pmids\": [\"10351942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CCL11 (eotaxin) is a natural antagonist for CCR2 and an agonist for CCR5 in addition to its primary agonist activity at CCR3. Eotaxin displaces 125I-MCP-1 from monocytes, inhibits MCP-1-induced chemotaxis and enzyme release via CCR2, and induces CCR5 internalization but not CCR2 internalization.\",\n      \"method\": \"Radiolabeled ligand binding assays, calcium flux assay, chemotaxis assay, enzyme release assay, receptor internalization assay in monocytes and transfected cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal in vitro assays with transfected cells and primary monocytes, replicated across CCR2 and CCR5\",\n      \"pmids\": [\"11264152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CCL11 (eotaxin) is a partial agonist of CCR2b: at 1 µM it induces chemotaxis of CCR2b transfectants and THP-1 cells (blocked by anti-CCR2 but not anti-CCR3), while sub-stimulatory concentrations inhibit MCP-1-induced chemotaxis and calcium flux through CCR2b. Eotaxin binds CCR2b with Kd = 7.50 nM vs 1.68 nM at CCR3.\",\n      \"method\": \"Chemotaxis assay, intracellular calcium flux, radioligand binding on CCR2b and CCR3 transfectants, antibody blocking\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative binding and functional assays in transfected cells with multiple readouts\",\n      \"pmids\": [\"11559700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"IL-13 upregulates CCL11 expression in airway epithelial cells (BEAS-2B) via a STAT6-dependent mechanism: IL-13 activates STAT6 nuclear binding to the eotaxin promoter, and mutation of the STAT6 binding site or use of a dominant-negative STAT6 abolishes IL-13-induced promoter activation and CCL11 protein secretion.\",\n      \"method\": \"RT-PCR, ELISA, promoter-luciferase reporter transfection, EMSA, site-directed mutagenesis, dominant-negative STAT6 cotransfection\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter mutagenesis + dominant-negative STAT6 + EMSA, multiple orthogonal methods in one study\",\n      \"pmids\": [\"11415942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TNF-α and IL-4/IL-13 induce CCL11 (eotaxin-1) expression in fibroblasts through a STAT6-mediated transcriptional pathway. TNF-α inducibility requires STAT6 (shown by STAT6-defective HEK293 cells), involves a composite STAT6/NF-κB element, and a dominant-negative STAT6 inhibits TNF-α-induced CCL11 secretion in primary fibroblasts.\",\n      \"method\": \"Promoter-luciferase reporter assay, EMSA, cotransfection with STAT6 expression vectors, dominant-negative STAT6, ELISA\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter construct + mutagenesis + dominant-negative approach, multiple orthogonal methods\",\n      \"pmids\": [\"11254707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL-1β induces CCL11 (eotaxin) gene transcription in airway epithelial cells via an NF-κB site located 46 bp upstream from the transcriptional start site. Site-directed mutagenesis showed this NF-κB site is necessary and sufficient for IL-1β induction; p50 and p65 bind this site; and NF-κB inhibitors block IL-1β-induced CCL11 mRNA expression.\",\n      \"method\": \"Nuclear run-on transcription assay, promoter-luciferase reporter, site-directed mutagenesis, EMSA, supershift assay, NF-κB inhibitors, p65 overexpression\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter mutagenesis + EMSA + supershift + overexpression in one study\",\n      \"pmids\": [\"11076795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TNF-α-induced CCL11 gene transcription in airway smooth muscle cells is mediated mainly by NF-κB (p65/p50), which induces selective histone H4 acetylation on lysines 5 and 12 at the CCL11 promoter. β2-Agonists and glucocorticoids inhibit CCL11 by blocking TNF-α-induced histone H4 acetylation and p65 binding to the promoter without affecting NF-κB nuclear translocation or in vitro DNA binding.\",\n      \"method\": \"Luciferase reporter assay, Western blot, EMSA, electrophoretic mobility supershift assay, chromatin immunoprecipitation (ChIP)\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP assay directly demonstrating histone modification at CCL11 promoter + EMSA + luciferase\",\n      \"pmids\": [\"15972682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CCL11 (eotaxin) binds selectively to immobilized heparin with high affinity (Kd = 1.23 × 10⁻⁸ M), but not to heparan sulfate or other GAGs. This interaction protects CCL11 from proteolysis by plasmin and indirectly by cathepsin G and elastase, and co-administration of CCL11 and heparin significantly enhances eosinophil recruitment in a mouse air-pouch model in vivo.\",\n      \"method\": \"Heparin affinity binding assay (Kd determination), protease protection assay, mouse air-pouch model in vivo, in vitro chemotaxis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative binding assay + protease assay + in vivo functional validation\",\n      \"pmids\": [\"17384413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CCL11 undergoes bidirectional transport across the blood-brain barrier (BBB). The slow influx phase is explained by binding to cellular components in blood; the rapid uptake phase involves direct interactions with the BBB. A slow but saturable transport system exists from brain to blood. CCR3 did not facilitate CCL11 transport across the BBB. Transport does not disrupt BBB integrity.\",\n      \"method\": \"In vivo pharmacokinetic transport assay (multiple time regression), biphasic kinetics analysis, regional brain dissection, BBB disruption assay, pharmacological CCR3 blockade\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo transport quantification with multiple brain regions and mechanistic dissection of slow vs. rapid phases\",\n      \"pmids\": [\"24706984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The structural basis of CCL11/eotaxin-1 recognition of CCR3 was determined: sulfotyrosine residues at positions in the CCR3 N-terminus (residues 8-23) form hydrophobic, salt bridge, and cation-π interactions with residues conserved in CC chemokines. Intact CCR3 is sulfated, and sulfation enhances receptor activity. The orientation of CCL11 relative to the receptor N-terminus differs from that of CXC chemokines.\",\n      \"method\": \"NMR structure determination, peptide binding assay with chemical shift mapping, receptor sulfation validation, functional receptor activity assay\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure of CCL11 bound to sulfotyrosine-containing CCR3 peptide with functional validation\",\n      \"pmids\": [\"25450766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CCL11 induces CCR3-dependent smooth muscle cell (SMC) chemotaxis. CCR3 mRNA and protein are expressed in mouse aortic SMCs; CCL11-induced SMC migration in Boyden chamber and scrape-wound assay is blocked by anti-CCR3 (but not anti-CCR2) antibody. CCR3 and CCL11 are upregulated in medial and intimal SMCs after arterial injury.\",\n      \"method\": \"RT-PCR, Western blot, flow cytometry, Boyden chamber chemotaxis, scrape-wound assay, immunohistochemistry, antibody neutralization\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, antibody neutralization confirms CCR3 dependence\",\n      \"pmids\": [\"15130922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CCL11 (eotaxin/CCL11) exerts direct profibrogenic effects on human lung fibroblasts via CCR3, which is constitutively expressed on these cells. CCL11 increases fibroblast proliferation, MMP-2 activity, and collagen synthesis, but not TGF-β1 release or myofibroblast differentiation. CCL11-enhanced fibroblast migration is completely inhibited by anti-CCR3 neutralizing antibodies.\",\n      \"method\": \"Flow cytometry, RT-PCR, Northern blot, proliferation assay (tritiated thymidine), chemotaxis (Boyden chamber), collagen synthesis (tritiated proline), gelatin zymography, ELISA, antibody neutralization\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal assays with CCR3-neutralization confirming receptor dependence\",\n      \"pmids\": [\"16387592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"IL-9 induces CCL11/eotaxin-1 expression in human airway smooth muscle cells through STAT3 signaling (not STAT6 or STAT5). IL-9 induces STAT3 phosphorylation and STAT3 binding to the CCL11 promoter in vivo; dominant-negative STAT3β abolishes IL-9-induced CCL11 promoter activity; STAT3 siRNA reduces CCL11 mRNA.\",\n      \"method\": \"RT-PCR, ELISA, promoter-luciferase reporter, ChIP assay (STAT3 binding to promoter), dominant-negative constructs, siRNA knockdown\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950) / PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP + promoter reporter + dominant-negative + siRNA in one study series\",\n      \"pmids\": [\"15294996\", \"20169197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CCL11 stimulates piecemeal degranulation of eosinophil-associated RNases (EARs) from mouse eosinophils in vitro (EC50 5 nM via CCR3). Cell-free eosinophil granules express functional CCR3 receptors and secrete EAR and eosinophil peroxidase in response to CCL11.\",\n      \"method\": \"RNase enzymatic activity assay, electron microscopy (ultrastructure), in vitro eosinophil stimulation, mouse model of allergic airway inflammation\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional secretion assay with ultrastructural validation, novel finding of CCR3 on cell-free granules\",\n      \"pmids\": [\"22294786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"STAT6 binding to the eotaxin-3 promoter is blocked by omeprazole in EoE esophageal cells, explaining PPI-mediated suppression of IL-4-stimulated CCL11 (eotaxin) family production. Omeprazole had no effect on STAT6 phosphorylation or nuclear translocation but blocked binding of STAT6, RNA polymerase II, and trimethylated H3K4 to the eotaxin-3 promoter.\",\n      \"method\": \"ChIP assay (STAT6, RNA Pol II, H3K4me3), Western blot (STAT6 phosphorylation, nuclear translocation), ELISA, RT-PCR, promoter reporter construct\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP directly shows promoter-level mechanism with multiple histone/factor readouts\",\n      \"pmids\": [\"23185525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CCL11 promotes survival of anaplastic large cell lymphoma (ALCL) cells via autocrine CCR3 signaling and ERK1/2 phosphorylation, inducing expression of anti-apoptotic proteins Bcl-xL and survivin. ERK1/2 inhibition completely blocked CCL11-mediated cell survival and tumor proliferation.\",\n      \"method\": \"Cell survival assay, proliferation assay, ERK1/2 phosphorylation (Western blot), ERK inhibitor, in vivo tumor growth, immunostaining\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with pathway inhibition in vitro and in vivo validation\",\n      \"pmids\": [\"21406396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TGF-β1 synergizes with IL-13 to increase CCL11 expression in airway fibroblasts by augmenting STAT6 phosphorylation, nuclear translocation, and binding to the CCL11 promoter. TGF-β1 activates the MEK/ERK pathway to reduce IL-13Rα2 (the decoy receptor), thereby overcoming IL-13's autoregulatory feedback and enhancing STAT6-dependent CCL11 transcription.\",\n      \"method\": \"Nuclear run-on transcription assay, mRNA stability assay, STAT6 siRNA, promoter ChIP, Western blot (STAT6 phosphorylation and translocation), MEK/ERK inhibitor, IL-13Rα2 expression analysis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — transcriptional and post-transcriptional assays + ChIP + siRNA + pharmacological inhibition in one study\",\n      \"pmids\": [\"22573806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FGF21 acts on adipocytes in an autocrine manner to promote CCL11 expression and secretion via ERK1/2 activation, which drives eosinophil recruitment into subcutaneous white adipose tissue, leading to M2 macrophage accumulation and beige adipocyte biogenesis. CCL11 neutralization blocks FGF21-induced type 2 immune responses and beiging.\",\n      \"method\": \"Conditional knockout mice (adipose-specific FGF21 and β-Klotho ablation), CCL11 neutralization, ERK1/2 activation assay, eosinophil/macrophage quantification, adipocyte differentiation assays, CCL11 replenishment rescue\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + neutralization rescue + multiple cellular readouts in vivo\",\n      \"pmids\": [\"28844880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CCL11 signaling in ovarian carcinoma cells (via CCR2, CCR3, CCR5) stimulates proliferation and migration/invasion and activates ERK1/2, MEK1, and STAT3 phosphorylation. Neutralizing antibodies against CCR2, CCR3, and CCR5 inhibit CCL11-stimulated growth and invasion.\",\n      \"method\": \"Proliferation assay, migration/invasion assay, antibody neutralization, phosphoprotein analysis (ERK1/2, MEK1, STAT3), ELISA\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor antibody neutralization with multiple functional readouts; single lab\",\n      \"pmids\": [\"19351767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"OSM (oncostatin M) induces CCL11 production in fibroblasts via partial dependence on ERK1/2 and p38 MAPK signaling (not STAT3 alone); pharmacological inhibitors of ERK (PD98059) and p38 (SB203580) partially reduce OSM-induced CCL11 production in NIH 3T3 cells.\",\n      \"method\": \"ELISA, RT-PCR, Western blot (STAT3, ERK, p38 phosphorylation), pharmacological inhibitors, adenoviral OSM overexpression in vivo\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological pathway dissection with in vitro and in vivo data; signaling inhibitors give partial blockade\",\n      \"pmids\": [\"12496442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Genetic epistasis in mice shows that eotaxin (CCL11) overexpression in intestinal enterocytes drives gastrointestinal eosinophilia via a β7 integrin-dependent mechanism; genetic rescue (eotaxin transgene in eotaxin-deficient mice) restores gastrointestinal eosinophil levels, while β7-integrin blockade prevents accumulation.\",\n      \"method\": \"Transgenic mice (enterocyte-specific eotaxin expression), eotaxin gene-targeted mice with transgenic rescue, eosinophil quantification, β7 integrin blockade\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue in KO mice + integrin-blocking experiments establish pathway position\",\n      \"pmids\": [\"11733500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Genetic deletion of eotaxin-1 (CCL11) and eotaxin-2 together in mice (DKO) causes a marked decrease in pulmonary tissue eosinophilia in OVA-challenged asthma models, approaching the low levels seen in CCR3-deficient mice. Individual eotaxin-1 or eotaxin-2 deletion has modest effects, indicating synergistic and non-redundant roles in CCR3-mediated eosinophil recruitment.\",\n      \"method\": \"Targeted gene deletion (single and double KO), allergen-challenge asthma model, eosinophil quantification in BAL and tissue, CCR3-deficient mice comparison\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis using multiple KO combinations with defined in vivo phenotypic readouts\",\n      \"pmids\": [\"16210640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In airway smooth muscle cells, dimethylfumarate (DMF) inhibits NF-κB-dependent CCL11 (eotaxin) secretion by inducing IκBα glutathionylation (IκBα-SSG), which prevents IκBα degradation, NF-κB p65 nuclear entry, and NF-κB/DNA binding; DMF also inhibits phosphorylation of histone H3 via MSK-1 inhibition. These effects are reversed by glutathione-OEt.\",\n      \"method\": \"ELISA, EMSA, immunofluorescence, co-immunoprecipitation, immunoblotting (IκBα-SSG, p65, p-H3)\",\n      \"journal\": \"The European respiratory journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple molecular assays with pharmacological rescue; single lab\",\n      \"pmids\": [\"21719482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Eotaxin (CCL11) and IL-5 activate overlapping signal transduction pathways for eosinophil shape change, including MAPK, p38 MAPK, intracellular Ca2+, and PKA, but CCL11-induced shape change does not require PKC, which is required for IL-5-induced shape change and associated ERK1/2 activation.\",\n      \"method\": \"Gated autofluorescence/forward-scatter shape change assay, pharmacological inhibitors (MAPK, p38, Ca2+ depletion, PKA, PTK, PKC), ERK1/2 phosphorylation assay\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological pathway dissection with multiple inhibitors; specific PKC difference between CCL11 and IL-5 pathways established\",\n      \"pmids\": [\"12562334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In pancreatic cancer, ATX-LPA signaling suppresses CCL11 expression via inhibition of the AP-1 transcription factor c-Jun; ATX inhibition de-represses CCL11, increasing eosinophil accumulation in the tumor microenvironment. CCL11 neutralization reversed eosinophil accumulation caused by ATX inhibition, placing CCL11 downstream of ATX-LPA-c-Jun in this autocrine feedback loop.\",\n      \"method\": \"Genetic ATX inhibition (knockout), pharmacological ATX inhibition, CCL11 neutralization, eosinophil quantification, c-Jun activity assay, gene expression analysis, human PDAC specimen analysis\",\n      \"journal\": \"Nature cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic + pharmacological + neutralization approaches, multiple orthogonal methods establishing pathway position\",\n      \"pmids\": [\"38195933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CCL11 induces MMP-3 mRNA expression in human chondrocytes via ERK and p38 kinase pathways (inhibited by ERK and p38 inhibitors), while MMP-3 protein secretion is regulated by PLC-PKC cascade and JNK/MAP kinase pathways. cAMP/PKA pathway antagonizes CCL11-induced MMP-3 expression, and these effects are mediated through G protein-coupled CCL11 receptor activity.\",\n      \"method\": \"RT-PCR, pharmacological inhibitors (ERK, p38, PKA, PKC, JNK, PLC), ELISA, Western blot\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological pathway dissection without genetic confirmation; single lab\",\n      \"pmids\": [\"22114952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Brg1 (a chromatin remodeling protein) directly binds to the proximal CCL11 promoter and activates its transcription by interacting with NF-κB/RelA. NF-κB knockdown or inhibition disrupts Brg1 recruitment to the CCL11 promoter and blocks CCL11 induction in hepatocytes during liver regeneration.\",\n      \"method\": \"ChIP assay (Brg1 promoter binding), NF-κB knockdown, pharmaceutical NF-κB inhibition, liver-specific Brg1 knockout, adenoviral CCL11 overexpression, quantitative PCR, ELISA\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP showing direct promoter binding + conditional KO + rescue experiment\",\n      \"pmids\": [\"35614068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CCL11 promotes hepatic stellate cell (HSC) activation and liver fibrosis: CCL11 levels are elevated in HSCs from fibrotic mice and induced by TGF-β and PDGF. Zinc finger factor 281 binds the CCL11 promoter and mediates its trans-activation. CCL11 regulates HSC activation by stimulating Jagged 1 transcription; CCL11-/- or HSC-specific CCL11 knockdown mitigates fibrogenesis, and CCR3 antagonism or anti-CCL11 neutralizing antibodies ameliorate liver fibrosis.\",\n      \"method\": \"ChIP (ZNF281 promoter binding), RNA sequencing, CCL11-/- global KO, HSC-specific conditional knockdown, CCR3 antagonist, anti-CCL11 neutralizing antibodies, Jagged 1 reconstitution, ELISA, qPCR\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP + global and cell-specific KO + mechanistic target identification (Jagged 1) + multiple therapeutic rescue approaches\",\n      \"pmids\": [\"36651177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CCL11 promotes reactive oxygen species (ROS) production and DNA damage response (DDR) activation (p-TP53, γH2AX) in lung fibroblasts, leading to cellular senescence and increased secretion of senescence-associated secretory phenotype (SASP) cytokines IL-6 and IL-8.\",\n      \"method\": \"ROS assay, DNA damage response markers (Western blot: p-TP53, γH2AX), senescence assay, SASP cytokine ELISA, in silico target analysis (PseudoCell), gene expression in asthmatic airway epithelial cells\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple molecular readouts of senescence mechanism; single lab with in vitro + clinical data\",\n      \"pmids\": [\"37860000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCL11 promotes migration and proliferation of mouse neural progenitor cells (NPCs) in vitro; these effects are partly inhibited by the CCR3 antagonist SB297006. In neonatal hypoxic-ischemic injury, NPCs migrate toward injured areas where CC chemokines including CCL11 are markedly elevated.\",\n      \"method\": \"Migration assay, proliferation assay, CCR3 antagonist (SB297006), neonatal mouse hypoxic-ischemic brain injury model, chemokine quantification\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional assays with pharmacological CCR3 blockade; mechanistic link to CCR3 is partial\",\n      \"pmids\": [\"28173860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In human umbilical vein endothelial cells (HUVECs), CCL11-CCR3 interaction activates the PI3K/Akt signaling pathway (not ERK1/2), promoting endothelial cell migration and angiogenesis. CCR3 siRNA knockdown reduces PI3K phosphorylation, and PI3K inhibitors abolish CCL11-induced Akt phosphorylation.\",\n      \"method\": \"Scratch wound assay, MTS proliferation assay, rat aortic ring sprouting assay, siRNA knockdown of CCR3, PI3K inhibitors, Western blot (Akt, ERK1/2 phosphorylation)\",\n      \"journal\": \"Journal of receptor and signal transduction research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown + pharmacological inhibition with functional angiogenesis readout; single lab\",\n      \"pmids\": [\"28279120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Myeloid cell-specific NF-κB/RelA (p65) regulates CCL11 expression and intestinal eosinophilic inflammation: DSS-induced CCL11 expression, eosinophilic inflammation, and histopathology are attenuated in RelA/p65(Δmye) mice. Calprotectin (S100a8/S100a9) induces CCL11 production from macrophages via a p65-dependent mechanism.\",\n      \"method\": \"Conditional myeloid-specific p65 knockout, DSS colitis model, STAT6-/- comparison, LPS stimulation of bone marrow-derived macrophages, gene array analysis, immunofluorescence, flow cytometry\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular and molecular phenotype, epistasis with STAT6 pathway\",\n      \"pmids\": [\"23562811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCL11 promotes CCR3-dependent self-amplifying expression in RA fibroblast-like synoviocytes (FLS): CCL11 induces its own mRNA and CCR3 mRNA expression; TNF-α induces CCL11/CCR3 expression; CCR3 antagonist reduces TNF-α-induced CCL11 secretion; CCL11 induces migration of RA FLS and monocytes; CCL11 siRNA reduces FLS migration.\",\n      \"method\": \"ELISA, immunofluorescence, quantitative PCR, CCR3 antagonist, CCL11 siRNA, migration assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA + antagonist + functional migration assay; single lab, moderate evidence for autocrine loop\",\n      \"pmids\": [\"33846499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCL11 exacerbates DSS-induced colitis and colitis-associated tumorigenesis in mice: Ccl11-/- mice show decreased colon tumor number and burden, histologic injury, and eosinophil infiltration versus WT. Bone marrow chimera experiments showed that both hematopoietic- and epithelial cell-derived CCL11 are important for tumorigenesis.\",\n      \"method\": \"Ccl11-/- mice, DSS colitis model, AOM-DSS carcinogenesis model, bone marrow chimera, histology, eosinophil quantification\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mice + bone marrow chimera experiments, defined in vivo phenotypic readouts\",\n      \"pmids\": [\"34625710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Circulating CCL11 (eotaxin-1) mediates age-related cognitive decline: neutralizing anti-CCL11 antibody in standard-housed aged mice produces EE-like improvements in spatial memory, hippocampal neurogenesis, and microglial activation; conversely, interfering with CCL11 reduction during environmental enrichment ablates its beneficial effects.\",\n      \"method\": \"Anti-CCL11 neutralizing antibody treatment, environmental enrichment, hippocampal neurogenesis quantification, spatial memory testing, microglial activation assessment, ribosomal S6 activation\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function (neutralization) and gain-of-function (interference with CCL11 reduction) experiments with defined mechanistic and behavioral readouts\",\n      \"pmids\": [\"34418501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Elevated CCL11 levels in the tumor microenvironment suppress dendritic cell differentiation/maturation, skewing toward a Th2 immune response and impairing CD8+ T cell-mediated tumor lysis. Myeloid IKKβ loss in macrophages reduces MHC class II expression and enhances CCL11 production, promoting melanoma growth.\",\n      \"method\": \"Myeloid-specific IKKβ knockout mice, allograft tumor models, macrophage depletion, CD8+ T cell depletion, serum/tissue CCL11 measurement, flow cytometry (MHC II, DC maturation)\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with depletion experiments and defined immunological readouts; single lab\",\n      \"pmids\": [\"25336190\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCL11 (eotaxin-1) functions primarily as a CC chemokine that binds with high affinity to CCR3 (and also partially to CCR2 and CCR5), activating G protein-coupled downstream pathways including ERK1/2, p38 MAPK, PI3K/Akt, STAT3, and intracellular Ca2+ flux to drive eosinophil chemotaxis, degranulation, and recruitment via haptotactic gradients stabilized by selective heparin binding; its transcription is regulated by NF-κB (IL-1β/TNF-α axis), STAT6 (IL-4/IL-13 axis), and STAT3 (IL-9 axis) at the CCL11 promoter, with histone H4 acetylation as an additional epigenetic control point, and it additionally acts on non-hematopoietic cells including smooth muscle cells, fibroblasts, and endothelial cells to promote migration, fibrogenesis, and angiogenesis, crosses the blood-brain barrier via saturable transport to regulate hippocampal neurogenesis, and participates in adipose tissue beiging, liver fibrosis via Jagged 1, and tumor immune modulation through context-dependent interactions with its receptors CCR3, CCR2, and CCR5.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CCL11 (eotaxin-1) is a CC chemokine that functions as a central mediator of eosinophil recruitment and activation, with broader roles in tissue remodeling, neurogenesis regulation, fibrogenesis, and tumor immune modulation. CCL11 signals primarily through CCR3 — and also acts as a partial agonist at CCR2 and an agonist at CCR5 — to activate ERK1/2, p38 MAPK, PI3K/Akt, STAT3, and intracellular calcium flux, driving chemotaxis, degranulation, proliferation, and survival in eosinophils, smooth muscle cells, fibroblasts, endothelial cells, and tumor cells [PMID:8676064, PMID:10415066, PMID:11264152, PMID:28279120, PMID:11559700]. CCL11 transcription is controlled by NF-κB (p65/p50) in response to TNF-α/IL-1β, by STAT6 downstream of IL-4/IL-13, and by STAT3 downstream of IL-9, with chromatin remodeling via selective histone H4 acetylation and Brg1 recruitment at the CCL11 promoter [PMID:11076795, PMID:11415942, PMID:15294996, PMID:15972682, PMID:35614068]. CCL11 undergoes bidirectional saturable transport across the blood-brain barrier and, as a circulating factor, inhibits hippocampal neurogenesis during aging; it also drives hepatic stellate cell activation and liver fibrosis through Jagged 1 induction, promotes adipose tissue beiging via eosinophil-mediated type 2 immunity, and modulates the tumor immune microenvironment by suppressing dendritic cell maturation and CD8+ T cell responses [PMID:24706984, PMID:34418501, PMID:36651177, PMID:28844880, PMID:25336190].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Identification of CCR3 as the high-affinity eotaxin receptor on eosinophils established CCL11 as a selective chemoattractant acting through a specific GPCR, resolving the receptor identity question.\",\n      \"evidence\": \"Radioligand binding and transwell chemotaxis with CCR3-transfected cells and primary eosinophils\",\n      \"pmids\": [\"8676064\", \"8687456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal/cryo-EM structure of the full CCL11–CCR3 complex at this time\", \"Downstream intracellular signaling pathways uncharacterized\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstration that CCR3 is expressed on Th2 (but not Th1) lymphocytes expanded CCL11's target cell repertoire beyond eosinophils and linked it to adaptive Th2 immunity at sites of allergic inflammation.\",\n      \"evidence\": \"Flow cytometry, calcium flux, chemotaxis assays, and immunostaining of allergic tissue sections\",\n      \"pmids\": [\"9302298\", \"9480044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CCL11 directly polarizes T cell responses or only recruits pre-existing Th2 cells\", \"Relative contribution of CCL11 vs. other CCR3 ligands to Th2 recruitment in vivo\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"CCL11 was shown to activate ERK1/2 MAPK to drive eosinophil rolling, chemotaxis, and actin remodeling, establishing the first intracellular signaling mechanism downstream of CCR3.\",\n      \"evidence\": \"MAPK phosphorylation assays, PD98059 inhibitor, in vivo rolling assay, and in vitro chemotaxis\",\n      \"pmids\": [\"10415066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of parallel pathways (p38, PI3K, calcium) not yet dissected for eosinophils\", \"Mechanism linking ERK to actin polymerization not resolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapping the NF-κB site at −46 bp in the CCL11 promoter as necessary and sufficient for IL-1β induction defined the first transcription factor controlling CCL11 expression.\",\n      \"evidence\": \"Promoter mutagenesis, EMSA with p50/p65 supershift, NF-κB inhibitors, nuclear run-on assay in airway epithelial cells\",\n      \"pmids\": [\"11076795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NF-κB cooperates with other factors for full CCL11 induction\", \"Chromatin-level regulation not yet examined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovery that CCL11 acts as a natural antagonist at CCR2 and an agonist at CCR5 revealed cross-receptor pharmacology that enables CCL11 to modulate monocyte function beyond eosinophil-specific signaling.\",\n      \"evidence\": \"Radioligand displacement, calcium flux, chemotaxis, enzyme release, and receptor internalization assays on monocytes and transfected cells\",\n      \"pmids\": [\"11264152\", \"11559700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of CCR2 antagonism vs. CCR3 agonism in vivo\", \"Structural basis for partial agonism at CCR2\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"STAT6 was established as a master transcriptional regulator of CCL11 expression downstream of IL-4/IL-13, with composite STAT6/NF-κB elements mediating cytokine-induced transcription in epithelial cells and fibroblasts.\",\n      \"evidence\": \"Promoter-luciferase reporters, STAT6 site mutagenesis, dominant-negative STAT6, EMSA, ELISA in BEAS-2B cells and primary fibroblasts\",\n      \"pmids\": [\"11415942\", \"11254707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of STAT6 vs. NF-κB to CCL11 induction in different cell types\", \"Epigenetic co-regulation not yet addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genetic epistasis in transgenic and knockout mice demonstrated that enterocyte-derived CCL11 is sufficient to drive gastrointestinal eosinophilia via β7 integrin, establishing CCL11 as a non-redundant tissue-homing signal.\",\n      \"evidence\": \"Enterocyte-specific CCL11 transgene in eotaxin-KO mice with β7 integrin blockade\",\n      \"pmids\": [\"11733500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether heparin/GAG binding in the gut modulates CCL11 gradient formation\", \"Roles of eotaxin-2 and eotaxin-3 in compensating for CCL11 loss\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"IL-9 was shown to induce CCL11 via STAT3 (not STAT6 or STAT5), revealing a third independent transcription factor axis at the CCL11 promoter and broadening the cytokine inputs controlling its expression.\",\n      \"evidence\": \"ChIP (STAT3 binding to CCL11 promoter), dominant-negative STAT3β, STAT3 siRNA, promoter-luciferase in airway smooth muscle cells\",\n      \"pmids\": [\"15294996\", \"20169197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether STAT3 and STAT6 binding to the CCL11 promoter is cooperative or mutually exclusive\", \"In vivo relevance of IL-9–STAT3–CCL11 axis in asthma\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"TNF-α–induced CCL11 transcription was linked to selective histone H4 acetylation (K5/K12) at the CCL11 promoter, providing the first epigenetic mechanism and explaining how glucocorticoids and β2-agonists suppress CCL11 at the chromatin level.\",\n      \"evidence\": \"ChIP for histone H4 acetylation and p65 binding, EMSA, luciferase reporter in airway smooth muscle cells\",\n      \"pmids\": [\"15972682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the histone acetyltransferase(s) responsible\", \"Whether histone modifications differ between cell types\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Double knockout of CCL11 and eotaxin-2 in mice reduced pulmonary eosinophilia to near CCR3-KO levels, demonstrating synergistic and non-redundant roles of the two eotaxins in allergic airway inflammation.\",\n      \"evidence\": \"Single and double eotaxin-KO mice, OVA-challenge asthma model, comparison with CCR3-KO\",\n      \"pmids\": [\"16210640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of eotaxin-3 (CCL26) to residual eosinophilia\", \"Whether temporal expression differences explain synergy\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"CCL11 was found to bind heparin with high affinity and selectivity, protecting it from proteolysis and enhancing eosinophil recruitment in vivo — establishing a haptotactic gradient mechanism for tissue-level chemotaxis.\",\n      \"evidence\": \"Heparin affinity binding (Kd measurement), protease protection assays, mouse air-pouch model\",\n      \"pmids\": [\"17384413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether heparin binding alters CCL11 conformation or receptor engagement\", \"Tissue-specific GAG composition effects on gradient formation\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"CCL11 was shown to stimulate piecemeal degranulation of eosinophil granule contents via CCR3, including the finding that cell-free granules express functional CCR3, revealing an extracellular signaling mode for CCL11.\",\n      \"evidence\": \"RNase activity assay, electron microscopy, eosinophil stimulation with CCL11 (EC50 5 nM)\",\n      \"pmids\": [\"22294786\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CCR3 is maintained on cell-free granule membranes\", \"Downstream signaling in cell-free granules\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"NMR structural determination of CCL11 bound to the sulfotyrosine-containing CCR3 N-terminus revealed the molecular basis of receptor recognition, including salt bridge and cation-π interactions distinct from CXC chemokine binding modes.\",\n      \"evidence\": \"NMR structure, chemical shift mapping, sulfotyrosine peptide binding, receptor sulfation validation\",\n      \"pmids\": [\"25450766\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length CCR3 complex structure in lipid environment not solved\", \"Structural basis for partial agonism at CCR2 unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"CCL11 was demonstrated to cross the blood-brain barrier via a saturable transport system independent of CCR3, establishing it as a blood-borne signal capable of directly accessing the CNS.\",\n      \"evidence\": \"In vivo pharmacokinetic transport assay with multiple time regression, regional brain dissection, CCR3 blockade\",\n      \"pmids\": [\"24706984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the BBB transporter\", \"Whether transport is regulated by aging or disease\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"FGF21–ERK1/2 signaling in adipocytes was shown to induce CCL11 secretion that recruits eosinophils to drive M2 macrophage polarization and beige fat biogenesis, placing CCL11 as a metabolic effector beyond classical immunity.\",\n      \"evidence\": \"Adipose-specific FGF21 and β-Klotho KO mice, CCL11 neutralization and replenishment rescue, ERK1/2 activation\",\n      \"pmids\": [\"28844880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CCL11-driven beiging contributes to systemic energy expenditure in humans\", \"Relative importance of CCL11 vs. other eosinophil chemoattractants in adipose tissue\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Anti-CCL11 neutralizing antibodies in aged mice improved hippocampal neurogenesis and spatial memory, establishing circulating CCL11 as a causal mediator of age-related cognitive decline.\",\n      \"evidence\": \"Anti-CCL11 antibody treatment, environmental enrichment, hippocampal neurogenesis and behavioral testing in aged mice\",\n      \"pmids\": [\"34418501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell type(s) in hippocampus directly responding to CCL11\", \"Whether CCL11 acts through CCR3 in the brain or via an alternative receptor\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"CCL11 was identified as a direct activator of hepatic stellate cells that promotes liver fibrosis by inducing Jagged 1 transcription, with ZNF281 mediating CCL11 trans-activation at its own promoter — extending CCL11's fibrogenic role to the liver.\",\n      \"evidence\": \"ChIP (ZNF281), CCL11-KO mice, HSC-specific knockdown, CCR3 antagonist, anti-CCL11 antibodies, Jagged 1 reconstitution\",\n      \"pmids\": [\"36651177\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Jagged 1–Notch signaling fully accounts for CCL11's fibrogenic activity\", \"Whether hepatic CCL11–CCR3 axis is targetable without compromising immune defense\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"In pancreatic cancer, ATX-LPA signaling was found to suppress CCL11 expression via c-Jun inhibition, with ATX blockade de-repressing CCL11 and increasing tumor eosinophil infiltration — positioning CCL11 as a downstream effector in lipid-mediated tumor immune evasion.\",\n      \"evidence\": \"ATX knockout and pharmacological inhibition, CCL11 neutralization, c-Jun activity assay, human PDAC specimens\",\n      \"pmids\": [\"38195933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether eosinophils recruited by CCL11 are tumoricidal or pro-tumorigenic in PDAC\", \"Generalizability to other solid tumors\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the molecular identity of the CCL11 BBB transporter, the full-length structure of the CCL11–CCR3 signaling complex in a membrane environment, and whether CCL11's pro-fibrogenic, pro-senescence, and anti-neurogenic activities share a common downstream effector pathway or represent context-dependent divergent signaling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"BBB transporter identity unknown\", \"No full-length CCL11–CCR3 membrane complex structure\", \"Unified mechanism linking fibrogenesis, senescence, and neurogenesis suppression not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 7, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [4, 6, 13, 14, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 5, 7, 8, 24, 36]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 19, 26, 27, 37]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 21, 24, 36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CCR3\",\n      \"CCR2\",\n      \"CCR5\",\n      \"RELA\",\n      \"STAT6\",\n      \"STAT3\",\n      \"JAG1\",\n      \"ZNF281\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}