| 1998 |
CXCL11 (I-TAC) was identified as a novel non-ELR CXC chemokine that selectively binds CXCR3 with higher affinity than the other CXCR3 ligands CXCL9 and CXCL10, induces transient intracellular calcium mobilization, and drives chemotactic migration of IL-2-activated T cells but not unstimulated T cells, neutrophils, or monocytes. |
Radioligand binding assays, calcium mobilization assays, chemotaxis assays using activated T cells and CXCR3-transfected cell lines |
The Journal of experimental medicine |
High |
9625760
|
| 1999 |
CXCL11 (IP-9/beta-R1/H174/I-TAC) is a keratinocyte-derived CXCR3 ligand with a molecular mass of 8303 Da; it was isolated by challenging CXCR3-expressing CHO cells with IFN-γ-stimulated keratinocyte proteins and shown to be chemotactic for CXCR3-expressing activated T cells. |
Functional receptor activation assay on CXCR3-transfected CHO cells, protein purification, protein sequence analysis, mass spectrometry, molecular cloning of cDNA, chemotaxis assay |
The Journal of investigative dermatology |
High |
10233762
|
| 1999 |
Induction of CXCL11 (beta-R1/I-TAC) by IFN-β requires catalytically active TYK2 kinase; cells with kinase-deficient TYK2 mutants fail to express CXCL11 in response to IFN-β despite robust induction of other IFN-stimulated genes, and this regulation occurs at the transcriptional level via the CXCL11 promoter. |
Complementation of TYK2-deficient U1 cells with wild-type or kinase-dead TYK2 mutants; transient transfection of CXCL11 promoter-reporter construct |
The Journal of biological chemistry |
High |
9890942
|
| 2000 |
CXCL11 (I-TAC), along with CXCL9 and CXCL10, acts as a natural antagonist for CCR3: it competes for eotaxin binding to CCR3, inhibits CCR3-mediated migration and Ca²⁺ flux, and does not induce CCR3 internalization, qualifying it as a pure antagonist. A chimeric chemokine with the first 8 N-terminal residues of I-TAC substituted onto eotaxin showed enhanced CCR3 binding affinity. |
Radioligand binding competition assays on CCR3-bearing cells, chemotaxis assays, calcium mobilization assays, receptor internalization assays, chimeric chemokine design |
The Journal of biological chemistry |
High |
11110785
|
| 2001 |
CXCL11 (I-TAC) is the principal physiological inducer of CXCR3 internalization upon T cell contact with IFN-γ-activated endothelial cells, despite being secreted at lower levels than CXCL10 or CXCL9; it is also the most potent inducer of transendothelial migration. CXCR3 internalization induced by CXCL11 is not blocked by pertussis toxin or wortmannin, suggesting a distinct signal transduction pathway from chemotaxis. |
Immunofluorescence microscopy, flow cytometry, neutralizing monoclonal antibodies to CXCL10/CXCL9/CXCL11, recombinant chemokine dose-response assays, transendothelial migration assay, pharmacological inhibitors |
Journal of immunology |
High |
11739530
|
| 2002 |
DPP IV (CD26) expressed on T cells cleaves CXCL11 at its N-terminus (generating CXCL11(3-73)), reducing its CXCR3 binding affinity 8-fold, completely abolishing calcium flux and chemotactic activity, while retaining the ability to desensitize CXCR3 by down-regulating the receptor. |
DPP IV inhibitor, biochemical cleavage assay, radioligand binding, calcium flux assay, chemotaxis assay using PHA/IL-2-treated T cells |
Journal of leukocyte biology |
High |
12101279
|
| 2003 |
CXCL11 signals through an alternatively spliced CXCR3 variant, CXCR3-B, which is expressed on microvascular endothelial cells and mediates angiostatic effects and apoptotic cell death, distinct from the pro-survival signaling of CXCR3-A. CXCL9, CXCL10, and CXCL11 all bind both CXCR3-A and CXCR3-B. |
Transfection of HMEC-1 cells with CXCR3-A or CXCR3-B constructs, radioligand binding, DNA synthesis assays, apoptosis assays, anti-CXCR3-B monoclonal antibodies, immunohistochemistry |
The Journal of experimental medicine |
High |
12782716
|
| 2003 |
CXCL11 is the most efficacious antagonist of CCR3-mediated eosinophil responses among the CXCR3 ligands; it and other CXCR3 ligands share overlapping binding sites within the CCR3 extracellular loops (identified using CCR3-CCR1 chimeric receptor constructs), and CCL11 (eotaxin) binds CXCR3 with high affinity, suggesting CXCR3 may act as a decoy receptor for CCL11. |
Radioligand binding competition assays, calcium mobilization assays, chemotaxis assays using human eosinophils and CCR3 transfectants, CCR3-CCR1 chimeric receptor constructs |
European journal of immunology |
High |
12884299
|
| 2004 |
CXCL11-induced CXCR3 internalization predominantly requires the third intracellular loop of CXCR3 (distinct from CXCL9/CXCL10 which require the C-terminal domain and beta-arrestin1); chemotaxis and calcium mobilization by all three ligands require the CXCR3 carboxyl terminus and the DRY motif in TM3. |
Site-directed mutagenesis of CXCR3 intracellular domains, internalization assays, chemotaxis assays, calcium mobilization assays in transfected cells |
The Journal of biological chemistry |
High |
15150261
|
| 2004 |
CXCL11 (I-TAC) is a natural antagonist for CCR5: it inhibits MIP-1α binding to CCR5 transfectants and monocytes, and blocks RANTES- and MIP-1β-induced CCR5-mediated cell migration, intracellular calcium release, and actin polymerization. Sequence/structure analysis implicated residues K17, K49, and Q51 of CXCL11 in CCR5 binding. |
Radioligand binding competition assays on CCR5 transfectants and monocytes, chemotaxis assays, calcium mobilization, actin polymerization assay, structural analysis |
Journal of leukocyte biology |
High |
15178708
|
| 2004 |
The NMR solution structure of CXCL11 (ITAC) adopts the canonical chemokine fold but exhibits greater conformational flexibility than related chemokines. Unlike CXCL10 and IL-8, CXCL11 does not form dimers at millimolar concentrations, attributable to a beta-bulge in beta-strand 1 that distorts the CXC dimerization interface. |
Solution NMR spectroscopy, structural comparison with CXCL10 |
Protein science |
High |
15273303
|
| 2004 |
CXCL11-mediated CXCR3 internalization and cell migration require the membrane-proximal carboxyl terminus of CXCR3 (including the LLL motif specifically for CXCL11-induced internalization); integrin-dependent adhesion and actin polymerization at high CXCL11 concentrations require the third intracellular loop residue S245; migration is pertussis toxin-dependent. |
Site-directed mutagenesis of CXCR3 carboxyl terminus and third intracellular loop in HEK293 cells, internalization assays, migration assays, Ca²⁺ flux assays, integrin adhesion assays, pertussis toxin inhibition |
Blood |
High |
16368892
|
| 2005 |
CXCL11 (IP-9) promotes motility in undifferentiated keratinocytes through CXCR3 signaling via a phospholipase C-β3/calcium flux/mu-calpain (calpain 1) pathway; it activates mu-calpain but not M-calpain (calpain 2), leading to cleavage of focal adhesion kinase and disassembly of vinculin aggregates, distinct from the ERK/M-calpain pathway used by EGF. |
In vitro wound healing assay, pharmacological inhibitors (PLC, calpain, calcium chelation), RNAi knockdown of calpain 1 vs. calpain 2, focal adhesion kinase cleavage assay, vinculin immunostaining, calpain activity assay |
Molecular and cellular biology |
High |
15713646
|
| 2005 |
CXCL11 inhibits osteoclastic differentiation of human monocytes and mediates IFN-β's (but not IFN-α2's) superior inhibitory effect on osteoclastogenesis; CXCL11 is the only IFN-induced gene differentially upregulated by IFN-β relative to IFN-α2 in this system, and recombinant CXCL11 alone inhibits osteoclast differentiation. |
Expression profiling, recombinant CXCL11 treatment, osteoclast differentiation assays using primary human monocytes |
Proceedings of the National Academy of Sciences of the USA |
Medium |
16081539
|
| 2006 |
CXCR7 binds CXCL11 (I-TAC) with high affinity in addition to its primary ligand CXCL12; unlike canonical chemokine receptors, CXCR7 activation by CXCL11 does not cause Ca²⁺ mobilization or induce cell migration, but confers a growth and survival advantage and increased cell adhesion. |
Radioligand binding assays, Ca²⁺ mobilization assay, migration assays, cell survival/growth assays, adhesion assays, small molecule CXCR7 antagonist in vivo tumor models |
The Journal of experimental medicine |
High |
16940167
|
| 2006 |
Heparin displaces membrane-associated CXCL11 (I-TAC) from endothelial cell surfaces and reduces CXCL11-dependent transendothelial T cell migration, indicating that CXCL11 is sequestered on the vascular endothelium through glycosaminoglycan interactions; systemic heparin administration in vivo releases CXCL11 into plasma. |
In vivo heparin administration in cardiac surgery patients (plasma ELISA), displacement of membrane-associated chemokines from cultured endothelial cells, transendothelial migration assay under shear stress, in vivo T cell recruitment assay in humanized mouse model |
Circulation |
Medium |
16940188
|
| 2007 |
CD13/aminopeptidase N (APN) processes CXCL11 by N-terminal truncation (removing up to 6 amino acids) to generate truncated forms that have reduced CXCR3 and CXCR7 binding and signaling, impaired lymphocyte chemotaxis, and failed calcium mobilization via CXCR3; truncated CXCL11 retains ability to desensitize CXCR3 but cannot induce Ca²⁺ flux through CXCR7. CD26/DPP IV also processes CXCL11 synergistically with CD13. |
Protease cleavage assays with purified CD13/APN and CD26, radioligand binding assays on CXCR3 and CXCR7 transfectants, calcium mobilization assays, chemotaxis assays with primary lymphocytes and transfected cells, HMVEC migration assay |
Blood |
High |
17363734
|
| 2007 |
CXCL11 gene induction by IFN requires STAT3 in a manner independent of STAT3 Y705 phosphorylation; STAT3 recruits the transcriptional activators p65 (NF-κB) and IRF1 to the CXCL11 promoter, while displacing the repressors p50 and IRF2. In STAT3-deficient cells, p50 and IRF2 occupy the promoter instead. |
STAT3 knockout mouse embryonic fibroblasts reconstituted with wild-type or Y705 mutant STAT3, IFN sensitivity assays, chromatin immunoprecipitation (ChIP) assays for STAT3/p65/p50/IRF1/IRF2 binding to CXCL11 promoter |
Journal of immunology |
High |
17202361
|
| 2007 |
IL-18 enhances IFN-γ-induced CXCL11 production in human keratinocytes through parallel activation of NF-κB, STAT1, and IRF-1; IRF-1 is specifically required for CXCL11 (but not CXCL9/CXCL10) production in this context. IL-18 activates PI3K/Akt and MEK/ERK pathways that regulate NF-κB and STAT1 activities. |
Antisense oligonucleotides against NF-κB p50, p65, STAT1, IRF-1; PI3K, p38 MAPK, MEK inhibitors; phosphorylation assays; ELISA and RT-PCR |
European journal of immunology |
Medium |
17274000
|
| 2008 |
MMP-8 (PMN-specific), MMP-12 (macrophage-specific), and MMP-9 process CXCL11 at both N- and C-termini to generate CXCL11(5-73), (5-63), and (5-58). N-terminal truncation abolishes agonist activity and converts CXCL11 to a CXCR3 antagonist with enhanced heparin affinity; further C-terminal truncation to position 58 removes antagonist activity and heparin binding, revealing the C-terminal helix as critical for glycosaminoglycan binding. |
MALDI-TOF mass spectrometry substrate identification, recombinant MMP cleavage assays, calcium mobilization, chemotaxis assays using CXCR3 transfectants and human T lymphocytes, heparin binding assays |
The Journal of biological chemistry |
High |
18411283
|
| 2008 |
Peptidylarginine deiminase (PAD/PAD2) citrullinates CXCL11 by deiminating arginine, impairing CXCR3 signaling and T-cell activation without affecting CXCR3 binding; citrullination also decreases heparin binding of CXCL11. |
PAD/PAD2 enzymatic treatment of CXCL11, CXCR3 binding assays, signaling assays, T-cell activation assays, heparin binding assays |
Blood |
High |
18645041
|
| 2008 |
EBV miRNA BHRF1-3 suppresses CXCL11 (I-TAC) expression in lymphoma cells; transfection of an antisense oligonucleotide to BHRF1-3 reverses CXCL11 suppression, indicating CXCL11 is a direct target of this viral miRNA. |
Expression correlation analysis, antisense oligonucleotide reversal experiment in EBV-infected lymphoma cell lines |
Cancer research |
Medium |
18316607
|
| 2008 |
CXCL11 (IP-9) produced by redifferentiating keratinocytes promotes re-epithelialization and dermal maturation during wound healing; mice expressing an antisense CXCL11 construct showed impaired wound healing with hypercellular immature dermis, delayed re-epithelialization, deficient basement membrane formation, and persistence of provisional matrix components. |
Antisense transgenic mouse model (IP-9AS), full and partial thickness excisional wounds, histological analysis over 2 months, immunostaining for laminin V, collagen IV |
The American journal of pathology |
High |
18669615
|
| 2010 |
CXCR7 acts as a scavenger receptor for CXCL11 and CXCL12, mediating constitutive ligand internalization and targeting chemokines for degradation without G-protein coupling; CXCR7 continuously cycles between plasma membrane and intracellular compartments in the absence and presence of ligand, and CXCL11 scavenging is not saturable with increasing ligand concentrations. |
Chemokine internalization and degradation assays in mammalian cells and zebrafish, CXCR7 membrane cycling experiments, active CXCL12/CXCL11 sequestration demonstrated in mouse heart valves and human umbilical vein endothelium |
PloS one |
High |
20161793
|
| 2010 |
GAG-binding epitopes of CXCL11 were mapped: residues in the C-terminal helix (K57SKQ AR62 cluster) together with K17 form the dominant heparin-binding epitope; mutation of these residues preserved near-wild-type CXCR3 binding and mild in vitro migration, but abolished in vivo cell migration, establishing a requirement for GAG binding for CXCL11 in vivo function. CXCL11 also exhibits conformational heterogeneity (NMR peak doubling) and more than one affinity state for both heparin and CXCR3. |
Alanine scanning mutagenesis of basic residue clusters, in vitro heparin binding assays, CXCR3 binding assays, in vitro and in vivo cell migration assays, NMR (HSQC spectra) |
The Journal of biological chemistry |
High |
20363748
|
| 2014 |
CXCL11/CXCR3 binding drives an immunotolerizing state (IL-10hi Tr1 and IL-4hi Th2 cells) via p70 kinase/mTOR in STAT3- and STAT6-dependent pathways, whereas CXCL10/CXCR3 drives Th1 polarization via STAT1/STAT4/STAT5 phosphorylation; CXCL11 binds CXCR3 with higher affinity than CXCL10. A CXCL11-Ig fusion molecule induced rapid remission and prevented relapse in EAE mice, mediated through reduced effector T cell accumulation at the autoimmune site. |
STAT phosphorylation assays (STAT1/3/4/5/6), T cell polarization assays, CXCL11-Ig fusion protein therapeutic treatment in relapsing EAE mouse model, GFP-expressing T cell tracking in vivo |
The Journal of clinical investigation |
High |
24713654
|
| 2015 |
CXCR3-CXCL11 signaling axis controls macrophage recruitment to mycobacterial infections in zebrafish; CXCR3 (cxcr3.2) mutant zebrafish show attenuated macrophage chemotaxis to bacterial infections and reduced Mycobacterium marinum dissemination; recombinant CXCL11-like proteins exert Cxcr3.2-dependent chemoattraction in vivo; CXCR3 deficiency reduces granuloma formation and total bacterial burden. |
Zebrafish cxcr3.2 mutant model, CXCR3 antagonist NBI74330, in vivo macrophage chemotaxis assays, recombinant CXCL11-like protein local administration, Mycobacterium marinum infection model, granuloma quantification, bacterial burden assays |
Disease models & mechanisms |
High |
25573892
|
| 2016 |
PRMT5-mediated symmetrical dimethylation of NF-κB p65 at Arg174 is required for CXCL11 gene induction by TNF-α plus IFN-γ costimulation in endothelial cells; p65 Arg174 methylation enhances p65 association with the CXCL11 promoter; this modification is distinct from Arg30/Arg35 methylation that controls CXCL10 induction. |
PRMT5 RNAi knockdown, p65 Arg174Ala/Lys reconstitution in p65-depleted endothelial cells, mass spectrometry of p65 methylation, ChIP and Re-ChIP assays for p65 and symmetrical dimethylarginine at CXCL11 promoter, CXCL11 mRNA/protein measurements |
PloS one |
High |
26901772
|
| 2016 |
Comprehensive mutagenesis of ACKR3/CXCR7 reveals different binding modes for CXCL11 and CXCL12: CXCL11 binding depends on the ACKR3 N-terminus and extracellular loop (ECL) residues for primary binding with ECL residues mediating arrestin recruitment; CXCL12 requires key residues Asp179(4.60) and Asp275(6.58) without evident N-terminal involvement. Mutations reducing CXCL11 binding also diminish scavenging, but arrestin recruitment does not strictly correlate with scavenging. |
30 substitution mutants of ACKR3, radioligand binding competition, beta-arrestin recruitment assays, chemokine scavenging assays |
The Journal of biological chemistry |
High |
27875312
|
| 2017 |
STAT2, in conjunction with IRF9 (but not STAT1 or STAT6), is required for IFN-α-induced CXCL11 and CCL5 expression in human keratinocytes; gene silencing of STAT2 by siRNA identified CXCL11 as one of only two cytokines (out of 102 analyzed) regulated through this STAT2-dependent mechanism. |
siRNA silencing of STAT2 in human keratinocytes, 102-cytokine panel analysis, IFN-α stimulation, siRNA knockdown of STAT1, STAT6, IRF9 to identify pathway specificity |
PloS one |
Medium |
28472186
|
| 2019 |
CXCL11 promotes self-renewal, tumorigenicity, and chemoresistance of α2δ1+ hepatocellular carcinoma tumor-initiating cells via CXCR3-mediated ERK1/2 activation, inducing stem cell-related genes (BMI1, NANOG, MDR1, ABCG2, CACNA2D1) through an autocrine signaling pathway. |
Recombinant CXCL11 treatment, CXCR3 blocking, ERK1/2 phosphorylation assays, sphere formation assays, tumorigenicity assays, gene expression analysis |
Cancer letters |
Medium |
30771435
|
| 2019 |
Docetaxel induces CXCL11 secretion by cancer cells via an ROS-dependent HMGB1 release mechanism: DOC increases ROS, causing HMGB1 release; recombinant HMGB1 stimulates CXCL11 secretion through NF-κB activation; CXCL11 subsequently promotes CD8+ T cell recruitment to the tumor microenvironment. |
ROS measurement, HMGB1 release assay, recombinant HMGB1 + NF-κB inhibitor treatment, CXCL11 ELISA, in vivo DOC-treated mouse tumors with HER2-CAR T cell infiltration assay, flow cytometry, immunofluorescence, western blotting |
Journal for immunotherapy of cancer |
Medium |
30744691
|
| 2020 |
CXCL11 secreted by therapy-induced senescent endothelial cells promotes breast cancer cell proliferation, migration, and invasion via CXCR3-mediated ERK activation; blocking CXCL11 with neutralizing antibody, CXCL11 siRNA, or CXCR3 siRNA synergistically reduces these effects. |
Conditioned medium transfer from senescent HUVEC, neutralizing anti-CXCL11 antibody, CXCL11 siRNA, CXCR3 siRNA, ERK phosphorylation assay, in vivo tumor-bearing mouse model |
Cancer letters |
Medium |
32659248
|
| 2021 |
RBM15 enhances CXCL11 mRNA stability in an m6A-dependent manner in clear cell renal cell carcinoma cells, promoting CXCL11 secretion and thereby macrophage infiltration and M2 polarization; RBM15 expression itself is driven by EP300/CBP-mediated histone 3 acetylation of the RBM15 promoter. |
RBM15 overexpression/knockdown, m6A-dependent mRNA stability assays, ChIP for H3 acetylation at RBM15 promoter, CXCL11 ELISA, macrophage co-culture assays, in vivo mouse xenograft models |
Free radical biology & medicine |
Medium |
35381326
|
| 2021 |
CXCL11 promotes HCC cell migration through a CXCR3/ERK1/2 signaling pathway; cancer-associated fibroblast (CAF)-derived CXCL11 activates the circUBAP2/miR-4756/IFIT1/3 axis in tumor cells, upregulating IL-1β and IL-17 to enhance migration; CXCL11 stimulation upregulates circUBAP2, which sponges miR-4756 to relieve inhibition of IFIT1 and IFIT3. |
CAF co-culture and conditioned medium assays, CXCL11 siRNA in CAFs, circUBAP2 silencing, IFIT1/IFIT3 silencing, miR-4756 inhibitor, IL-17/IL-1β measurements, in vivo orthotopic tumor models with metastasis quantification |
Cell death & disease |
Medium |
33707417
|
| 2018 |
Estrogen receptor α (ERα) directly recruits to and activates the CXCR7 promoter in ovarian cancer cells in response to estrogen, and CXCL11 gene expression is also upregulated by estrogen, causing Ser-118 phosphorylation and activation of ERα for positive feedback regulation of the CXCR7 promoter; CXCR7 (not CXCR3) mediates estrogen-induced mesenchymal marker expression and cancer cell migration. |
ChIP for ERα and histone modifications at CXCR7 promoter, CXCR7 expression knockdown, CXCL11 siRNA, cell migration assays, mesenchymal marker expression assays, ERα Ser-118 phosphorylation assays, microdissected tumor analysis |
Molecular oncology |
Medium |
30051594
|
| 2021 |
CXCL11 upregulation in response to SARS-CoV-2 infection in human lung epithelial cells is mediated in an AKT-dependent manner; pharmacological inhibition of AKT (GSK690693) markedly reduces CXCL11 gene induction, implicating the AKT pathway as a regulatory node for CXCL11 transcription during viral infection. |
SARS-CoV-2 infection of Calu-3 cells, small molecule kinase inhibitors (including AKT inhibitor GSK690693), qRT-PCR of CXCL11 transcripts |
Viruses |
Low |
34205098
|
| 2005 |
CXCL11 exerts its antitumor activity in vivo exclusively through attraction of CD8+CXCR3+ T lymphocytes, not through inhibition of angiogenesis; CD8 T cell depletion completely abrogated tumor rejection, and survivors developed tumor-specific IFN-γ-producing CD8+ T cell memory. |
EL4 tumor cells genetically modified to produce murine CXCL11, in vivo tumor growth assay, flow cytometry of tumor infiltrate, in vivo CD8 T cell depletion, angiogenesis analysis, rechallenge experiments with IFN-γ ELISpot |
Journal of immunotherapy |
Medium |
16000952
|
| 2004 |
CXCL11 attenuates bleomycin-induced pulmonary fibrosis by inhibiting aberrant vascular remodeling (reducing angiogenesis and endothelial cell numbers) rather than by directly affecting fibroblasts (CXCR3 is not expressed on fibroblasts and CXCL11 has no direct functional effect on pulmonary fibroblasts). |
Systemic CXCL11 administration in bleomycin mouse model, measurement of collagen deposition, procollagen gene expression, histopathology, lung leukocyte populations, angiogenic activity, endothelial cell quantification |
American journal of respiratory and critical care medicine |
Medium |
15502109
|
| 2008 |
CXCL11 drives T cell egression (luminal clearance) across bronchial epithelium through a polarized transepithelial gradient; T cell adhesion to the basal surface requires α4 integrin and LFA-1, and transmigration is LFA-1-dependent; egression decreases transepithelial resistance without grossly altering tight-junction proteins and does not require epithelial injury. |
T cell egression assay across primary bronchial epithelium, CXCL11 gradient assay, integrin blocking antibodies (anti-α4, anti-LFA-1), transepithelial resistance measurement, immunofluorescence for tight-junction proteins |
Journal of immunology |
Medium |
18209084
|
| 2005 |
CXCL9, CXCL10, and CXCL11 stimulate Gαi-independent PI3K/MAPK activation and actin reorganization in intestinal myofibroblasts (CXCR3 mRNA detectable but no surface CXCR3 detected); CXCL11 uniquely elevates intracellular calcium in these cells. These responses are pertussis-toxin insensitive, suggesting a modified or variant CXCR3 coupling mechanism distinct from peripheral blood lymphocytes. |
PI3K and MAPK activation assays, actin reorganization assays, calcium mobilization assay, RT-PCR and flow cytometry for CXCR3 expression, pertussis toxin inhibition |
Journal of immunology |
Medium |
16210647
|