| 1997 |
CCR6 (then called GPR-CY4) is the specific receptor for the chemokine LARC/CCL20: LARC induced calcium flux and migration in cells stably expressing GPR-CY4, and LARC-SEAP fusion protein bound specifically to GPR-CY4-expressing cells with a Kd of 0.9 nM. No other tested CC chemokines (MCP-1, RANTES, MIP-1α, MIP-1β, TARC) competed for this binding. |
Calcium mobilization assay, chemotaxis assay, ligand-binding assay with SEAP-fusion protein in stably transfected cells |
The Journal of biological chemistry |
High |
9169459
|
| 2000 |
CCR6 is required for dendritic cell localization to the subepithelial dome of Peyer's patches and for normal mucosal humoral immune responses; CCR6-knockout mice lack CD11c+CD11b+ DCs in the subepithelial dome, have impaired IgA responses to oral antigens/rotavirus, and show 2–15-fold increases in intestinal T-cell subpopulations, while systemic responses remain normal. |
CCR6 knockout mouse analysis, immunohistochemistry, immune challenge with oral antigen and rotavirus |
Immunity |
High |
10843382
|
| 2001 |
CCR6 deficiency results in underdeveloped Peyer's patches lacking myeloid CD11b+CD11c+ DCs in the subepithelial dome, increased intestinal T-cell numbers, exaggerated contact hypersensitivity responses, and absent delayed-type hypersensitivity responses, demonstrating CCR6 is required for proper DC and T-cell trafficking in cutaneous and intestinal immunity. |
CCR6 knockout mouse model, histology, CHS and DTH assays |
The Journal of clinical investigation |
High |
11254677
|
| 2000 |
CCR6 expression on B cells is acquired upon maturation into naive/memory B cells and is absent from germinal center B cells and plasma cells; CCL20/MIP-3α induces vigorous B-cell transmigration with preferential chemotaxis of IgD− memory B cells, establishing functional CCR6-dependent chemotaxis in B-cell subsets. |
Flow cytometry, transmigration chemotaxis assays across defined B-cell differentiation stages |
Blood |
Medium |
11001880
|
| 2000 |
TNF-α induces CCR6 expression on cytokine-activated neutrophils, rendering them functionally responsive to its ligand LARC/CCL20 (demonstrated by 125I-LARC binding and dose-dependent migration); IFN-γ induces lower CCR6 levels and the two cytokines act synergistically. |
Northern blot, 125I-labeled LARC binding assay, chemotaxis assay, neutralizing antibody experiments |
Blood |
Medium |
11090084
|
| 2002 |
CCR6 is expressed predominantly on myeloid (CD11b+) but not lymphoid (CD8α+) dendritic cell subsets, on all mature B cells, and on subsets of T cells, as demonstrated by a CCR6-EGFP knock-in reporter mouse; CD4+ myeloid DCs are uniformly CCR6+, and Langerhans cells express CCR6 at lower levels. |
CCR6-EGFP knock-in mouse, flow cytometry, bone marrow culture |
European journal of immunology |
High |
11754009
|
| 2001 |
IL-10 maintains CCR6 expression during Langerhans cell development and induces CCR6 on monocytes, while IL-4 transiently suppresses CCR6 (reversible blockade of LC differentiation) and IFN-γ irreversibly downregulates CCR6 coincident with DC maturation; TGF-β triggers irreversible CCR6 downregulation during terminal LC differentiation. |
In vitro cytokine stimulation of DC precursors, flow cytometry, functional CCL20 responsiveness assays |
Journal of immunology |
Medium |
11698430
|
| 2004 |
CCR6 expressed on polarized intestinal epithelial cells (predominantly apically) signals via Gαi proteins upon apical CCL20 stimulation: it induces tyrosine phosphorylation of p130Cas (Crk-associated substrate) and inhibits cAMP production and cAMP-mediated chloride secretion; pertussis toxin abolishes cAMP inhibition, confirming Gαi coupling. |
Polarized T84/Caco-2/HT-29/HCA-7 cell lines, apical stimulation with CCL20, pertussis toxin inhibition, p130Cas phosphorylation assay, cAMP/chloride secretion measurements |
American journal of physiology. Cell physiology |
High |
15483227
|
| 2005 |
CCR6 on donor CD4+ T cells is required for their migration to and infiltration of target tissues (skin, gut) in graft-versus-host disease; CCR6-deficient donors showed reduced skin/gut CD4+ infiltration, delayed lesion onset, milder pathology, and lower IFN-γ, IL-10, and homing-chemokine levels in target organs. |
Allogeneic GvHD mouse models (MHC class II-mismatched and MHC-matched/miHA-mismatched), CCR6-knockout donors, histopathology, cytokine measurement |
Blood |
Medium |
15774622
|
| 2008 |
CCR6 expression in Th17 cells is regulated by TGF-β and requires the nuclear receptors RORα and RORγ; Th17 cells also produce the CCR6 ligand CCL20 (induced synergistically by TGF-β and IL-6 via STAT3, RORγ, and IL-21), enabling autocrine/paracrine CCR6-dependent recruitment. CCR6-deficient Th17 cells show reduced recruitment into EAE inflammatory tissues and reduced disease severity. |
In vitro differentiation of Th17 cells, nuclear receptor overexpression/knockout, CCR6-deficient mice in EAE model, in vitro migration assays |
Journal of immunology |
High |
19050256
|
| 2009 |
CCR6 ligands (CCL20 and β-defensins) induce expression of the HIV restriction factor APOBEC3G in CCR6+ CD4+ T cells through a Gαi-dependent pathway (blocked by pertussis toxin), providing a post-entry mechanism of HIV inhibition in CCR6+ cells. |
APOBEC3G induction assay in CCR6+ vs. CCR6− cells, pertussis toxin inhibition, HIV infection assays |
Blood |
Medium |
20023216
|
| 2010 |
CCR6 on regulatory T cells marks colon-tropic, IL-10-producing iTregs; CCR6-deficient iTregs have impaired suppressive capacity in a T-cell transfer colitis model despite equivalent frequency in lymph nodes and colon, and CCR6+ Tregs preferentially migrate to the inflamed colon. |
Rag2−/− T-cell transfer colitis model, CCR6-KO mice, cotransfer experiments, flow cytometry, cytokine measurements |
Journal of immunology |
Medium |
20720211
|
| 2011 |
CCR6 on plasmacytoid dendritic cells (pDCs) is acquired after IL-3-driven instruction in lymphoid tissues (following initial CCR7 upregulation), enabling CCR6-dependent homing of pDCs to inflamed epithelia; competitive adoptive transfer in CCR6-deficient mice confirmed that CCR6 is required for pDC homing to inflamed skin tumors. |
Competitive adoptive transfer of WT vs. CCR6-deficient pDCs, imiquimod skin tumor model, IL-3 culture induction, flow cytometry |
Blood |
Medium |
21937703
|
| 2011 |
CCR6 promotes atherogenesis by supporting monocyte homeostasis in blood and direct CCL20-induced monocyte chemotaxis: Ccr6−/−ApoE−/− mice have ~40% less aortic lesion area with 44% less macrophage content; CCL20 induces chemotaxis of WT but not Ccr6−/− primary monocytes; bone marrow transplant from Ccr6−/− donors into ApoE−/− mice recapitulates the atheroprotection. |
Ccr6−/−ApoE−/− double-KO mice, bone marrow transplantation, in vitro monocyte chemotaxis assay, CCL20 injection in vivo (monocytosis assay), lesion quantification |
Circulation research |
High |
21680896
|
| 2012 |
CCR6 mediates positioning of Th17 cells near bile ducts in the inflamed liver: cholangiocytes stimulated by cytokines secrete CCL20, which induces CCR6-dependent migration of Th17 cells; CCR6 blockade in vitro reduces Th17 migration toward cholangiocyte-conditioned medium. |
In vitro chemotaxis assay with CCR6-blocking antibody, CXCR3 antibody blockade in vivo (intravital microscopy), flow cytometry of liver-infiltrating cells |
Journal of hepatology |
Medium |
22796894
|
| 2013 |
CCR6 is required for accumulation of IL-17/IL-22-expressing γδ T cells in injured liver; Ccr6−/− mice develop more severe fibrosis with enhanced immune infiltration in chronic liver injury models (CCl4 and MCD diet); adoptive transfer of WT (but not CD4) γδ T cells into Ccr6−/− mice reduces hepatic inflammation and fibrosis to WT levels; hepatic γδ T cells promote HSC apoptosis via Fas-ligand in a cell-contact-dependent, IL-17-independent manner. |
Ccr6−/− mice in chronic liver injury models, adoptive transfer of γδ vs. CD4 T cells, flow cytometry, in vitro HSC apoptosis assay, Il-17−/− cell transfer |
Hepatology |
High |
23959575
|
| 2013 |
CCR6 on Th17 cells mediates migration to the ocular surface in dry eye disease via CCL20 expressed by the conjunctival epithelium; subconjunctival neutralization of CCL20 reduces in vitro T-cell migration and decreases conjunctival Th17 infiltration and inflammatory cytokines in vivo. |
CCR6-KO mice, dry eye disease model, in vitro chemotaxis assay with CCL20-neutralizing antibody, subconjunctival antibody administration in vivo, flow cytometry |
Investigative ophthalmology & visual science |
Medium |
23702781
|
| 2014 |
CCR6 in mouse sperm is localized predominantly to the sperm tail and is functional: human sperm exhibit directional chemotaxis and motility changes toward CCL20 in vitro, and CCR6 ligands (including CCL20 and DEFB29) are present in reproductive tract fluids. |
Immunofluorescence and immunoblot for CCR6 in mouse and human sperm, RT-PCR for Ccr6/Defb29 mRNA in testis/epididymis, protein chip analysis of reproductive fluids, in vitro sperm chemotaxis assay |
Journal of cellular physiology |
Medium |
23765988
|
| 2014 |
CCL20-CCR6 interactions promote spontaneous intestinal tumorigenesis: CCR6KO-ApcMin/+ mice have diminished tumor number and normalized spleen size compared to ApcMin/+ mice; CCR6 loss reduces macrophage infiltration into adenomas; CCL20 signaling through CCR6 increases CCL20 production by colorectal cancer cells (autocrine loop) and has a direct mitogenic effect on cancer cells. |
CCR6-KO × ApcMin/+ mouse cross, tumor quantification, macrophage infiltration immunostaining, CCL20 stimulation of cancer cell lines |
PloS one |
Medium |
24866282
|
| 2015 |
PLZF (encoded by ZBTB16) is a transcriptional activator that regulates CCR6 expression in human Th17 cells: PLZF binds enhancer-like sites at −9/−10 and −13/−14 kb upstream of the CCR6 transcription start site (by ChIP), and ZBTB16 knockdown downregulates CCR6 and other Th17 genes; PLZF and RORγt cross-regulate each other, and PLZF binds at the RORC promoter in CCR6+ cells. |
ChIP for modified histones, p300, and PLZF; siRNA knockdown of ZBTB16 in human T cells; transcriptome analysis; CCR6 expression monitoring |
Journal of immunology |
High |
25833398
|
| 2016 |
CCR6 on B cells negatively regulates germinal center entry: CCR6-deficient mice show accelerated GC appearance, increased dark zone/light zone ratio, decreased antigen-specific IgG1 and IgG2a (but not IgM) in a B-cell-intrinsic manner in mixed bone marrow chimeras; CCR6 is rapidly upregulated on activated B cells and only activated B cells migrate toward CCL20. |
Mixed bone marrow chimeras (WT vs. CCR6-KO), flow cytometry for GC kinetics and DZ/LZ ratio, ELISA for antigen-specific antibodies, in vitro CCL20 migration assay |
Immunology and cell biology |
Medium |
27465674
|
| 2017 |
CCR6 signaling inhibits iTreg suppressor function and directs Treg-to-Th17 lineage conversion: CCL20 inhibits TGF-β1-induced iTreg differentiation in a CCR6-dependent manner, reduces surface expression of suppressor molecules (CD39, CD73, FasL), impairs suppressive function, and induces phosphorylation of Akt, mTOR, and STAT3. |
In vitro Treg differentiation assays with/without CCL20 and CCR6 blockade, flow cytometry for Treg markers, phospho-western blots for Akt/mTOR/STAT3, suppression assays |
Journal of autoimmunity |
Medium |
29126851
|
| 2017 |
CCR6 is required for ligand-induced CatSper-dependent Ca2+ influx in human sperm: CCR6 co-localizes and co-immunoprecipitates with CatSper; siRNA knockdown of either CCR6 or CatSper abolishes Ca2+ influx induced by DEFB1, CCL20, and progesterone; this Ca2+ pathway is required for sperm motility, hyperactivation, and acrosome reaction, which are impaired in infertile sperm with reduced CCR6/CatSper levels. |
Co-immunoprecipitation, co-localization by immunofluorescence, siRNA knockdown, Ca2+ current measurements, sperm functional assays (motility, hyperactivation, acrosome reaction) |
Oncotarget |
Medium |
29207656
|
| 2018 |
Somatic truncating mutations (nonsense and frameshift) in CCR6 cluster in the C-terminal cytoplasmic tail in MALT lymphomas; these mutations are predicted to remove the phosphorylation motif required for β-arrestin-mediated receptor desensitization and internalization, suggesting gain-of-constitutive signaling. |
Whole exome sequencing of MALT lymphoma samples, bioinformatic analysis of mutation clustering |
Haematologica |
Low |
29674500
|
| 2020 |
Cryo-EM structure of human CCR6 bound to its endogenous ligand CCL20 and an engineered Gαo protein at 3.3 Å resolution shows CCL20 binds in a shallow extracellular pocket making limited contact with the 7-TM core; this binding allosterically rearranges a noncanonical toggle switch and opens the intracellular crevice for G protein coupling, demonstrating that protein-agonist GPCR activation does not always require deep 7-TM interactions. |
Cryo-electron microscopy structure determination at 3.3 Å, structural analysis of activation mechanism |
Nature communications |
High |
32541785
|
| 2016 |
CCL20/CCR6 promotes tumor angiogenesis in colorectal cancer via the AKT/NF-κB/VEGF-A pathway: CCR6 silencing decreases HUVEC proliferation and migration, while CCR6 overexpression promotes angiogenesis; mechanistically, CCR6 activation leads to AKT/NF-κB pathway activation and increased VEGF-A secretion. |
CCR6 siRNA knockdown and overexpression in CRC cells, HUVEC proliferation and migration assays, AKT/NF-κB signaling analysis, in vivo angiogenesis assay |
Biochimica et biophysica acta. Molecular basis of disease |
Medium |
29097259
|
| 2016 |
CCL20/CCR6 signaling regulates bone mass accrual: Ccr6−/− mice have significantly decreased trabecular bone mass with reduced osteoblast numbers; CCL20 and CCR6 are co-expressed in osteoblast progenitors and upregulated during differentiation; CCR6 acts as a functional Gprotein-coupled receptor in osteoblasts; CCR6 loss inhibits osteoblast differentiation (markers, alkaline phosphatase, mineralization); CCL20 promotes osteoblast survival via PI3K-AKT; Ccl20−/− mice recapitulate the bone loss phenotype confirming specificity. |
μCT and histomorphometry in Ccr6−/− and Ccl20−/− mice, osteoblast differentiation assays, AKT phosphorylation assays, macrophage/T-cell recruitment assays |
Journal of bone and mineral research |
High |
26890063
|
| 2019 |
Cisplatin-stimulated macrophages promote ovarian cancer cell migration via CCL20 secretion activating CCR6 on cancer cells, triggering epithelial-to-mesenchymal transition; pharmacological CCL20 blockade on macrophages and siRNA-mediated CCR6 silencing in cancer cells abrogated migration induced by cisplatin-stimulated macrophages. |
Macrophage-cancer cell co-culture, cisplatin stimulation, CCL20 ELISA, siRNA CCR6 knockdown, migration assays, EMT marker analysis |
Cancer letters |
Medium |
31866467
|
| 2017 |
In CTCL, STAT3 is spontaneously activated and transcribes CCL20; CCL20 then signals through CCR6 in an autocrine manner to drive migration; knockdown of STAT3, CCL20, or CCR6, or CCL20 neutralizing antibody, all reduce CTCL cell migration in vitro; CCL20-neutralizing antibody prolongs survival of CTCL xenograft mice. |
STAT3/CCL20/CCR6 siRNA knockdown, CCL20 neutralizing antibody, in vitro migration assay, NOD/SCID xenograft mouse survival |
Oncotarget |
Medium |
26789110
|
| 2022 |
SMAD4 loss in colon epithelium increases CCL20 expression and chemoattracts CCR6+ immune cells (T regulatory, Th17, dendritic cells), promoting colitis-associated carcinogenesis; genetic deletion of Ccr6 abrogated these immune responses and significantly reduced tumor incidence in Smad4-conditional KO mice. |
Conditional colon-epithelial Smad4 KO mice with/without germline Ccr6 deletion, colitis model, tumor quantification, flow cytometry, immunostaining |
Gastroenterology |
High |
35863523
|
| 2024 |
Two inactive CCR6 structures determined by cryo-EM reveal two allosteric antagonist binding pockets: an extracellular pocket occupied by oxomorpholine antagonists (OXM1/OXM2) that disrupt the receptor activation network, and an intracellular pocket occupied by squaramide SQA1 that overlaps with the G protein binding site, stabilizing a closed (inactive) conformation; minimal allosteric cooperativity between the two pockets was observed. |
Cryo-EM structural determination of two ternary CCR6/SQA1/OXM complexes, pharmacological characterization of antagonist binding |
Nature communications |
High |
39217154
|
| 2024 |
CCR6-CCL20 signaling in tumor-infiltrating Tregs promotes glycolysis and lactate production, which is required for their immunosuppressive activity toward CD8+ T cells; Ccr6−/− Tregs show reduced glycolysis and lactic acid production with compensatory glutamine metabolism; Ccr6−/− mice show improved survival across multiple tumor models and enhanced anti-PD-1 efficacy in glioma. |
Ccr6-KO mice in multiple tumor models, metabolic assays (glycolysis, lactate, glutamine), CD8 T-cell suppression assays, anti-PD-1 combination therapy, CCL20 siRNA knockdown |
Cancer immunology research |
Medium |
39133127
|
| 2022 |
CCR6 deficiency in CCR6−/− mice strongly ameliorates radiation-induced alopecia and dermatitis (IRIAD); IL-6 deficiency reduces CCL20 and CCR6 upregulation, while CCR6 deficiency reciprocally reduces IL-6, IL-17, CCL3, and MHC upregulation, revealing a proximity-dependent cellular cross-talk loop amplifying radiation dermatitis. |
CCR6−/− mice, IL-6−/− mice, IL-1R−/− mice, scRNA-seq, genetic ablation studies, molecular inhibitor studies (JAK blockers, cyclosporine) |
EMBO molecular medicine |
Medium |
35785521
|
| 2015 |
CrkL adapter protein mediates CCL20/CCR6-induced epithelial-to-mesenchymal transition in gastric cancer via the Akt pathway (not ERK1/2): CCL20 activates p-CrkL, p-ERK1/2, p-Akt, vimentin, N-cadherin and MMP2 in a dose-dependent manner; si-CrkL ablates CCL20-induced vimentin, N-cadherin, MMP2 and migration/invasion, but does not affect p-ERK1/2. |
siRNA knockdown of CrkL, CCL20 stimulation dose-response, western blot for signaling pathway components, migration/invasion assays |
Cytokine |
Medium |
26044596
|
| 2009 |
CCL20/MIP-3α accounts for ~40% of RA synovial fluid chemotactic activity for monocytes; in vitro monocyte chemotaxis induced by MIP-3α is inhibited by pertussis toxin pretreatment of monocytes, confirming signaling through a Gi-coupled receptor. |
Modified Boyden chamber monocyte chemotaxis assay, pertussis toxin inhibition, ELISA, flow cytometry |
Laboratory investigation |
Medium |
12695561
|
| 2013 |
CCR6 selectively promotes monocyte (but not T cell) adhesion to inflamed endothelium and monocyte recruitment in an acute air-pouch inflammatory model; CCR6 reduces circulating Gr-1high and Gr-1low monocytes in Ccr6−/−Ldlr−/− mice, establishing a role for CCR6 in monocyte mobilization, adhesion, and chemotaxis that drives atherosclerosis. |
Ccr6−/−Ldlr−/− double-KO mice, in vitro monocyte adhesion assay to inflamed endothelium, in vivo air pouch monocyte recruitment model, flow cytometry |
Thrombosis and haemostasis |
Medium |
24114205
|
| 2023 |
PF-07054894 is a CCR6 antagonist that binds with slow dissociation kinetics (slower off-rate for CCR6 vs. CCR7/CXCR2) producing insurmountable inhibition of CCL20/CCR6-mediated human T-cell chemotaxis; oral administration in cynomolgus monkeys increases circulating CCR6+ T cells (consistent with blockade of homeostatic tissue egress); the compound also causes upregulation of cell-surface CCR6 in B cells in vivo and in vitro. |
β-arrestin GPCR panel screen (168 receptors), human T-cell chemotaxis assay, [3H]-PF-07054894 radioligand binding/dissociation kinetics, in vivo primate pharmacology, IL-23 mouse skin model |
The Journal of pharmacology and experimental therapeutics |
Medium |
37142443
|
| 2022 |
CCR6 in endometriosis: CCR6 binds TFEB in ESCs (co-IP confirmed), inhibiting TFEB nuclear translocation, thereby blocking lysosomal function and autophagic flux (autolysosome degradation), which promotes ESC proliferation and migration; macrophage-derived CCL20 activates this CCR6-TFEB pathway in co-culture. |
Co-immunoprecipitation (CCR6/TFEB), TFEB nuclear translocation assay, mRFP-GFP-LC3 autophagic flux reporter, lysosome function assays (Lyso-tracker, Gal3, acid phosphatase), CCL20-neutralizing antibody in vivo mouse model |
Stem cell research & therapy |
Medium |
35841069
|