| 1998 |
CXCL11 (I-TAC) was identified as a novel non-ELR CXC chemokine that binds selectively to CXCR3 with higher affinity than CXCL9 or CXCL10, induces transient intracellular calcium mobilization and chemotactic migration in IL-2-activated T cells and CXCR3-transfected cell lines, but not in neutrophils or monocytes. |
Receptor binding assays, calcium flux assays, chemotaxis assays in activated T cells and CXCR3 transfectants |
The Journal of experimental medicine |
High |
9625760
|
| 2003 |
CXCL11 binds and activates CXCR3-B, an alternatively spliced variant of CXCR3, which mediates angiostatic (anti-proliferative/pro-apoptotic) effects on endothelial cells, distinct from the pro-survival signaling of CXCR3-A. |
HMEC-1 transfection with CXCR3-A or CXCR3-B constructs, radioligand binding, DNA synthesis assays, apoptosis assays, signal transduction analysis |
The Journal of experimental medicine |
High |
12782716
|
| 2000 |
CXCL11, CXCL9, and CXCL10 (CXCR3 agonists) act as natural antagonists for CCR3, competing for eotaxin binding to CCR3-bearing cells and inhibiting CCR3-mediated migration and Ca2+ responses without inducing CCR3 internalization; CXCL11 was the most efficacious antagonist. |
Competitive binding assays, calcium flux assays, chemotaxis assays with CCR3 transfectants and human eosinophils; hybrid chemokine construction |
The Journal of biological chemistry |
High |
11110785
|
| 2006 |
CXCL11 (I-TAC) binds with high affinity to CXCR7 (RDC1), an alternate receptor that does not couple to G-proteins or induce calcium mobilization or cell migration, but instead confers cell survival and adhesion advantages; CXCR7 expression promotes in vivo tumor growth. |
Radioligand binding, calcium mobilization assays, cell migration assays, adhesion assays, small molecule antagonist studies, in vivo tumor models |
The Journal of experimental medicine |
High |
16940167
|
| 2010 |
CXCR7 functions as a scavenger receptor for CXCL11 and CXCL12, mediating constitutive ligand internalization and targeting chemokines for lysosomal degradation without G-protein coupling; CXCR7 continuously cycles between plasma membrane and intracellular compartments in both mammalian cells and zebrafish. |
Ligand internalization assays, degradation assays, live-cell imaging/receptor cycling assays in mammalian cells and zebrafish; active CXCL12 sequestration demonstrated in mouse heart valves and human umbilical vein endothelium |
PloS one |
High |
20161793
|
| 2004 |
CXCL11 uses distinct intracellular domains of CXCR3 for internalization: the third intracellular loop is predominantly required for CXCL11-induced CXCR3 internalization, whereas CXCL9 and CXCL10 require the carboxyl-terminal domain and beta-arrestin1. All three ligands require the carboxyl terminus and DRY sequence for chemotaxis and calcium mobilization. |
CXCR3 deletion/point mutants expressed in cells, internalization assays, chemotaxis assays, calcium mobilization assays, beta-arrestin co-immunoprecipitation |
The Journal of biological chemistry |
High |
15150261
|
| 2002 |
Dipeptidyl peptidase IV (DPP IV/CD26) expressed on T cells cleaves CXCL11 at its N-terminus (removing two residues to generate CXCL11(3-73)), reducing CXCR3 binding ~8-fold, completely abolishing calcium flux and chemotaxis, but retaining partial CXCR3 downregulation activity so the truncated form desensitizes T cells to intact CXCL11. |
DPP IV inhibitor experiments, mass spectrometry characterization of cleavage product, calcium flux assays, chemotaxis assays, CXCR3 binding assays with T cells and transfectants |
Journal of leukocyte biology |
High |
12101279
|
| 2008 |
Matrix metalloproteinases MMP-8, MMP-12, and MMP-9 cleave CXCL11 at both amino and carboxyl termini, generating CXCL11-(5-73), -(5-63), and -(5-58) forms. N-terminal truncation converts CXCL11 from a CXCR3 agonist to an antagonist with enhanced heparin affinity (CXCL11-(5-73)); further C-terminal truncation to position 58 abolishes both antagonist activity and heparin binding. |
MALDI-TOF mass spectrometry identification of cleavage products, calcium mobilization assays, chemotaxis assays with CXCR3 transfectants and human T lymphocytes, heparin binding assays |
The Journal of biological chemistry |
High |
18411283
|
| 2008 |
Peptidylarginine deiminase (PAD) citrullinates CXCL11 by converting arginine to citrulline, impairing CXCR3 signaling and T-cell activation without altering receptor binding, and reducing heparin binding properties of CXCL11. |
In vitro citrullination with rabbit PAD and human PAD2, mass spectrometry, calcium mobilization assays, chemotaxis assays, heparin binding assays, CXCR3 binding assays |
Blood |
High |
18645041
|
| 2004 |
CXCL11 acts as a natural antagonist for CCR5: it inhibits MIP-1α/CCL3 binding to CCR5-transfected cells and monocytes, and blocks CCR5-mediated cell migration, calcium release, and actin polymerization; structural analysis implicates residues K17, K49, and Q51 of CXCL11 in CCR5 binding. |
Competitive binding assays, chemotaxis assays, calcium flux assays, actin polymerization assays with CCR5 transfectants and primary monocytes; structure-activity analysis |
Journal of leukocyte biology |
High |
15178708
|
| 2004 |
NMR solution structure of CXCL11 reveals the canonical chemokine fold with greater conformational flexibility than related chemokines; CXCL11 contains a beta-bulge in beta-strand 1 that distorts the dimerization interface and prevents dimer formation at millimolar concentrations, unlike CXCL10 and IL-8. |
Solution NMR structure determination |
Protein science |
High |
15273303
|
| 2005 |
CXCL11 (IP-9) promotes keratinocyte motility via CXCR3 signaling through a pathway requiring phospholipase C-β3-dependent intracellular calcium flux and selective activation of mu-calpain (calpain 1), leading to cleavage of focal adhesion kinase and disassembly of vinculin aggregates; this is distinct from EGF-induced motility which requires M-calpain (calpain 2). |
In vitro wound healing assay, pharmacological inhibitors of PLC-β3 and calcium chelation, RNAi-mediated depletion of calpain 1 vs. calpain 2, focal adhesion kinase cleavage assays, vinculin immunofluorescence |
Molecular and cellular biology |
High |
15713646
|
| 1999 |
IFN-beta induction of CXCL11 (beta-R1/I-TAC) requires catalytically active TYK2 kinase; cells expressing kinase-deficient TYK2 mutants fail to induce CXCL11 despite normal expression of other IFN-stimulated genes, indicating CXCL11 induction depends on an accessory TYK2-dependent signaling pathway beyond the canonical ISGF3/ISRE pathway. |
TYK2-deficient U1 cell complementation with wild-type or kinase-dead TYK2 mutants, promoter-reporter transfection assays, comparison of CXCL11 vs. other ISG induction |
The Journal of biological chemistry |
High |
9890942
|
| 2007 |
CXCL11 gene induction by IFN requires STAT3 in a non-canonical manner: STAT3 is required but Y705 phosphorylation is not needed; STAT3 recruits transcriptional activators NF-κB p65 and IRF1 to the CXCL11 promoter, while its absence leads to binding of repressors p50 and IRF2. |
STAT3-deficient cell lines, wild-type and Y705F STAT3 reconstitution, chromatin immunoprecipitation assays of CXCL11 promoter, promoter-reporter assays |
Journal of immunology |
High |
17202361
|
| 2016 |
PRMT5-mediated symmetric dimethylation of NF-κB p65 at Arg174 is required for TNF-α plus IFN-γ-induced CXCL11 gene expression in endothelial cells; p65 Arg174Ala or Arg174Lys mutants fail to associate with the CXCL11 promoter, and PRMT5 knockdown reduces CXCL11 mRNA and protein. |
PRMT5 RNAi, p65 Arg174 mutant reconstitution, mass spectrometric identification of methylation site, ChIP and Re-ChIP assays at CXCL11 promoter |
PloS one |
High |
26901772
|
| 2010 |
GAG-binding epitope of CXCL11 maps primarily to the C-terminal helix residues K57-K58-Q-A-R62 plus K17; mutation of these residues impairs heparin binding in vitro and abolishes in vivo cell migration despite retained receptor binding and near-normal in vitro chemotaxis, establishing a requirement for GAG interactions for CXCL11 in vivo function. CXCL11 also exhibits two affinity states for both heparin and CXCR3, likely related to its conformational flexibility. |
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
|
| 2005 |
CXCL11 has potent in vivo antitumor activity mediated primarily through recruitment of CD8+CXCR3+ T lymphocytes rather than inhibition of angiogenesis; in vivo CD8+ T cell depletion completely abolished the antitumor effect, and surviving mice developed protective antitumor immunity. |
EL4 tumor cells genetically modified to produce murine CXCL11, in vivo tumor growth assays, flow cytometric analysis of tumor infiltrates, in vivo CD8 T cell depletion, rechallenge experiments, IFN-γ production assays, angiogenesis assessment |
Journal of immunotherapy |
High |
16000952
|
| 2014 |
CXCL11/CXCR3 engagement 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 effector Th1 polarization via STAT1, STAT4, and STAT5. A CXCL11-Ig fusion induced remission and prevented relapse in EAE mouse model. |
T cell polarization assays, phospho-STAT Western blots, mTOR pathway inhibitors, CXCL11-Ig fusion protein therapeutic study in SJL/J EAE model, GFP T cell trafficking assays |
The Journal of clinical investigation |
High |
24713654
|
| 2005 |
CXCL11 attenuates bleomycin-induced pulmonary fibrosis by inhibiting angiogenesis and reducing pulmonary endothelial cell numbers; CXCR3 is not expressed on fibroblasts and CXCL11 has no direct effect on pulmonary fibroblasts, indicating the antifibrotic mechanism is indirect via vascular remodeling. |
In vivo bleomycin mouse model with systemic CXCL11 administration, collagen deposition assays, procollagen gene expression, histopathology, angiogenesis quantification, endothelial cell counting, CXCR3 expression analysis on fibroblasts |
American journal of respiratory and critical care medicine |
High |
15502109
|
| 2012 |
CXCL10 and CXCL11 are allosteric ligands of CXCR3 that engage distinct receptor conformations: CXCR3 mutants D112N, D195N, and E196Q respond to CXCL11 but not CXCL10 or synthetic agonists, indicating CXCL11 recognition by CXCR3 is largely independent of D112 and extracellular loop residues D195/E196 required for CXCL10. |
CXCR3 point mutant generation, radioligand binding, chemotaxis assays with natural and synthetic ligands, molecular modelling |
British journal of pharmacology |
Medium |
21895630
|
| 2016 |
ACKR3/CXCR7 binds CXCL11 through a different binding mode than CXCL12: CXCL11 requires the ACKR3 N-terminus and extracellular loop residues for primary binding and ECL residues for arrestin recruitment, while CXCL12 requires key residues D179 and D275 with no evident N-terminal involvement. Mutations reducing CXCL11 binding also impair scavenging; scavenging does not correlate with arrestin recruitment. |
30 ACKR3 substitution mutants, radioligand competition binding, β-arrestin recruitment assays, chemokine scavenging assays |
The Journal of biological chemistry |
High |
27875312
|
| 2005 |
CXCL9, CXCL10, and CXCL11 activate PI3K, MAPK, and actin reorganization in intestinal myofibroblasts through a Gαi-independent (pertussis toxin-insensitive) mechanism; CXCL11 uniquely elevates intracellular calcium in these cells despite no detectable surface CXCR3 expression, suggesting a variant or modified receptor coupling mechanism. |
PI3K and MAPK activation assays, actin reorganization assays, pertussis toxin treatment, calcium flux assays, CXCR3 surface expression analysis in intestinal myofibroblasts |
Journal of immunology |
Medium |
16210647
|
| 2005 |
CXCL11-induced CXCR3-dependent cell migration requires the membrane proximal carboxyl terminus (including the LLL motif) for internalization and migration, and the third intracellular loop S245 for integrin-dependent adhesion, actin polymerization, and migration at high CXCL11 concentrations; pertussis toxin inhibits CXCL11-induced migration confirming Gαi dependence in HEK 293 cells. |
CXCR3 carboxyl-terminus and third intracellular loop mutants expressed in HEK 293 cells, migration assays, internalization assays, calcium flux, integrin adhesion assays, actin polymerization assays, pertussis toxin treatment |
Blood |
High |
16368892
|
| 2008 |
EBV-encoded miRNA BHRF1-3 directly targets CXCL11/I-TAC mRNA; expression of BHRF1-3 inversely correlates with CXCL11 levels, and suppression of CXCL11 is reversed by transfection of antisense oligonucleotides to BHRF1-3. |
EBV miRNA expression profiling in primary lymphomas, inverse correlation analysis, antisense oligonucleotide rescue experiments |
Cancer research |
Medium |
18316607
|
| 2005 |
IFN-beta preferentially inhibits osteoclastogenesis compared to IFN-alpha2 (100-fold more potent); expression profiling identified CXCL11 as the only gene differentially upregulated by IFN-beta, and recombinant CXCL11 alone inhibits osteoclastic differentiation, indicating CXCL11 mediates part of the anti-osteoclastogenic effect of IFN-beta via autocrine signaling. |
Monocyte osteoclastic differentiation assays, IFN-alpha vs. IFN-beta treatment comparison, genome-wide expression profiling, recombinant CXCL11 treatment of differentiating monocytes |
Proceedings of the National Academy of Sciences |
High |
16081539
|
| 2006 |
CXCL11 promotes endometrial stromal cell proliferation via CXCR3 through p42/44 MAPK pathway activation, while inducing apoptosis of endometrial epithelial cells; IFN-gamma stimulates endometrial epithelial cells to produce CXCL11 which attracts trophoblast cells and T cells via CXCR3. |
Primary endometrial cell cultures, BrdU incorporation assays, lactate dehydrogenase release, annexin V staining, PD98059 MAPK inhibitor, immunoneutralization with anti-CXCL11 antibody, chemotaxis assays |
Journal of immunology |
Medium |
17142784
|
| 2008 |
CXCL11 is secreted in a polarized basolateral-to-apical gradient by bronchial epithelial cells in COPD, driving T cell egression (transepithelial migration from interstitium to airway lumen) dependent on α4 and LFA-1 integrins, without requiring epithelial barrier disruption. |
Transepithelial resistance measurements, T cell migration assays across intact bronchial epithelium, integrin-blocking antibodies, CXCL11 localization by immunofluorescence, COPD patient biopsies |
Journal of immunology |
Medium |
18209084
|
| 2008 |
CXCL11 (IP-9/I-TAC) produced by re-differentiating keratinocytes is required for wound repair: mice with antisense-mediated elimination of IP-9 expression during wound healing exhibit delayed re-epithelialization, hypercellular immature dermis, persistent provisional matrix components, and severely diminished basement membrane components (laminin V and collagen IV) without altered inflammatory response. |
Antisense transgenic mouse model (IP-9AS), full and partial thickness excisional wounds, histological analysis over 2 months, immunohistochemistry for matrix components |
The American journal of pathology |
High |
18669615
|
| 2019 |
Docetaxel induces ROS-dependent HMGB1 release from tumor cells; HMGB1 then stimulates CXCL11 secretion via NF-κB activation, and CXCL11 enhances CD8+ T cell recruitment to the tumor microenvironment through CXCR3. |
Flow cytometry, immunofluorescence, Western blotting for HMGB1 and CXCL11, recombinant HMGB1 stimulation of CXCL11 production, ROS inhibition, NF-κB pathway analysis, in vivo CAR T cell recruitment assays |
Journal for immunotherapy of cancer |
Medium |
30744691
|
| 2017 |
STAT2 regulates CXCL11 expression specifically in response to IFNα in keratinocytes; siRNA knockdown of STAT2 reduces IFNα-induced CXCL11 and CCL5 expression among 102 cytokines tested. This STAT2-dependent regulation of CXCL11 also requires IRF9 but not STAT1 or STAT6. |
STAT2 siRNA knockdown in human keratinocytes, 102-cytokine multiplex analysis, IFNα stimulation, IRF9/STAT1/STAT6 knockdown experiments |
PloS one |
Medium |
28472186
|
| 2021 |
RBM15 enhances CXCL11 mRNA stability in an m6A-dependent manner in ccRCC cells; elevated RBM15 (driven by EP300/CBP-mediated histone acetylation of its promoter) increases CXCL11 secretion, which promotes macrophage infiltration and M2 polarization. |
RBM15 knockdown/overexpression, CXCL11 mRNA stability assays, m6A modification assays, ChIP for H3 acetylation, macrophage co-culture, in vivo xenograft models |
Free radical biology & medicine |
Medium |
35381326
|
| 2018 |
Estrogen receptor α (ERα) directly binds the CXCR7 promoter in ovarian cancer cells to upregulate CXCR7 expression in response to estrogen; CXCL11 is also upregulated by estrogen, and CXCL11-induced ERα Ser-118 phosphorylation creates a positive feedback loop reinforcing CXCR7 transcription. CXCR7 (not CXCR3) mediates estrogen-induced mesenchymal marker expression and cancer cell migration. |
ChIP for ERα at CXCR7 promoter, histone modification analysis, CXCR7 siRNA knockdown, CXCL11-dependent ERα phosphorylation assays, cell migration assays, laser-capture microdissection of clinical samples |
Molecular oncology |
Medium |
30051594
|
| 2015 |
The CXCR3-CXCL11 signaling axis mediates macrophage chemotaxis to bacterial infection sites in zebrafish; loss of the zebrafish CXCR3 ortholog (cxcr3.2) attenuates macrophage recruitment to infection foci, reduces granuloma formation, limits mycobacterial dissemination, and decreases bacterial burden. Recombinant CXCL11-like chemokines exert Cxcr3.2-dependent chemoattraction in vivo. |
Zebrafish cxcr3.2 mutant analysis, NBI74330 CXCR3 antagonist treatment, in vivo injection of recombinant CXCL11-like proteins, M. marinum infection model, macrophage migration imaging, granuloma quantification |
Disease models & mechanisms |
High |
25573892
|
| 2007 |
IL-18 enhances IFN-γ-induced CXCL9, CXCL10, and CXCL11 production in human keratinocytes by activating NF-κB, STAT1, and IRF-1 through PI3K/Akt and MEK/ERK pathways; antisense oligonucleotides against NF-κB p50, p65, or STAT1 suppress CXCL11 production, and antisense IRF-1 specifically suppresses CXCL11. |
Cytokine stimulation of primary keratinocytes, ELISA, antisense oligonucleotides against transcription factors, PI3K/p38 MAPK/MEK inhibitors, phosphorylation assays |
European journal of immunology |
Medium |
17274000
|
| 2019 |
CXCL11 promotes self-renewal, tumorigenic, and chemoresistance properties of α2δ1+ hepatocellular carcinoma tumor-initiating cells via ERK1/2 activation through CXCR3 in an autocrine manner, inducing stem cell-related genes BMI1, NANOG, MDR1, ABCG2, and CACNA2D1. |
CXCL11 stimulation of α2δ1+ HCC TICs, sphere formation assays, tumor initiation assays, ERK1/2 phosphorylation assays, CXCR3 receptor blocking, gene expression profiling of stemness markers |
Cancer letters |
Medium |
30771435
|