Affinage

CD69

Early activation antigen CD69 · UniProt Q07108

Length
199 aa
Mass
22.6 kDa
Annotated
2026-04-28
100 papers in source corpus 28 papers cited in narrative 28 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

CD69 is a type II C-type lectin-like homodimeric receptor that functions as a central regulator of lymphocyte tissue retention, activation signaling, and immunomodulatory cytokine production. Structurally, CD69 dimerizes through its extracellular C-type lectin-like domain and uses its transmembrane helix to engage S1PR1 in cis, acting as a protein agonist that activates Gi-coupled S1PR1 internalization and degradation, thereby abolishing S1P-directed lymphocyte egress and enforcing tissue residency (PMID:20463015, PMID:37039481). Upon cross-linking, CD69 signals through its cytoplasmic tail via Src→Syk→PLCγ2/Vav1 and Ras→ERK pathways to drive Ca²⁺ influx, cytokine gene expression (IL-2, IFN-γ, TNF-α), and TGF-β production, while also associating with Jak3/Stat5 to suppress Th17 differentiation by inhibiting RORγt transcription (PMID:2501389, PMID:12077230, PMID:20696842, PMID:12732655). CD69 additionally interacts with extracellular ligands galectin-1 and S100A8/S100A9 to regulate Th17 and Treg differentiation, and associates with the LAT1-CD98 amino acid transporter to control L-tryptophan uptake and AhR-dependent IL-22 secretion (PMID:24752896, PMID:26296369, PMID:27376471).

Mechanistic history

Synthesis pass · year-by-year structured walk · 16 steps
  1. 1989 High

    Establishing that CD69 is a signaling receptor: cross-linking demonstrated that CD69 transduces Ca²⁺ influx and, when PKC is co-activated, drives cytokine gene expression (IL-2, IFN-γ) in a calcineurin-dependent manner, defining it as a functional activating receptor on T cells.

    Evidence Anti-CD69 mAb cross-linking on human T cells with Ca²⁺ flux measurement, cytokine assays, and cyclosporin A inhibition

    PMID:2501389

    Open questions at the time
    • Proximal signaling intermediates downstream of cross-linking were not identified
    • Whether CD69 signals autonomously or requires co-receptors was unresolved
  2. 1990 High

    Extending CD69 function beyond lymphocytes: CD69 was shown to be constitutively expressed on platelets as a disulfide-linked homodimer, where its cross-linking induced aggregation, Ca²⁺ influx, degranulation, and arachidonic acid metabolite production, establishing it as a functional activating receptor in non-lymphoid hematopoietic cells.

    Evidence Anti-CD69 mAb stimulation of human platelets with SDS-PAGE, Ca²⁺ flux, ATP release, and thromboxane/PGE2 measurement

    PMID:2388032

    Open questions at the time
    • Platelet CD69 ligand identity was unknown
    • Whether intracellular signaling pathways differ from lymphocytes was not tested
  3. 1993 High

    Defining CD69 molecular identity and linking its induction to positive selection: cDNA cloning revealed a 199-aa type II transmembrane protein with a C-type lectin-like domain on chromosome 12p; concurrently, CD69 induction during thymic selection was shown to require PKC-dependent signaling.

    Evidence PCR-based cDNA cloning with COS-7 expression; TCR-transgenic thymocyte stimulation with PMA and anti-TCR, flow cytometry

    PMID:8095460 PMID:8340758

    Open questions at the time
    • Whether CD69 is functionally required for selection or merely a marker was unclear
    • No structural data on the lectin domain
  4. 1994 High

    Placing Ras in the TCR-to-CD69 signaling axis: constitutively active v-Ha-ras induced CD69, while dominant-negative ras blocked TCR-mediated CD69 expression, establishing p21ras as an essential node upstream of CD69 transcription.

    Evidence Gain- and loss-of-function ras constructs in Jurkat cells, flow cytometry, ras GTP-loading assays

    PMID:7907294

    Open questions at the time
    • Downstream transcription factors linking ras to CD69 promoter were not identified in this study
  5. 1997 High

    Identifying AP-1 as a direct transcriptional regulator of CD69: an AP-1 site at position −16 in the CD69 promoter was shown to be transactivated by c-Jun, and dominant-negative c-Jun abolished inducible CD69 transcription, connecting the Ras/MAPK pathway to CD69 gene expression.

    Evidence CD69 promoter-reporter assays, EMSA, dominant-negative c-Jun cotransfection in T cells

    PMID:9580241

    Open questions at the time
    • Contribution of NF-κB sites to CD69 promoter regulation under other conditions was not fully resolved
    • Chromatin context was not addressed
  6. 2000 High

    Resolving the structural basis of the CD69 ectodomain and dissecting signaling domains: crystal structure showed the CTLD fold lacks canonical Ca²⁺/carbohydrate-binding features; concurrently, domain-swap chimeras demonstrated that the cytoplasmic tail (not receptor oligomerization) determines signaling output, while ERK activation was identified as required for CD69-mediated NK cell degranulation.

    Evidence X-ray crystallography of CD69 CTLD; CD69/CD23 chimeric receptors in RBL/Jurkat cells; ERK phosphorylation and degranulation assays in NK cells

    PMID:10671222 PMID:11034393 PMID:11036086

    Open questions at the time
    • Natural ligand identity remained unknown
    • How the short cytoplasmic tail engages signaling mediators was not determined
  7. 2002 High

    Defining the proximal signaling cascade and revealing a role in thymocyte egress: Src-family kinase–dependent Syk activation (not ZAP70) was identified as the proximal pathway linking CD69 cross-linking to PLCγ2/Vav1 phosphorylation and NK cytotoxicity; simultaneously, CD69 transgenic mice showed that constitutive CD69 expression blocks thymocyte export without affecting maturation.

    Evidence Anti-CD69 mAb cross-linking with kinase assays and pharmacological inhibitors in NK cells; CD69-transgenic mouse thymic analysis

    PMID:12039905 PMID:12077230

    Open questions at the time
    • Molecular mechanism by which CD69 blocks egress was unknown
    • Whether Syk activation occurs in T cells as well as NK cells was not shown
  8. 2003 High

    Establishing CD69 as an immunosuppressive regulator through TGF-β: CD69-deficient mice showed enhanced anti-tumor immunity due to reduced TGF-β production and increased MCP-1; direct CD69 engagement induced TGF-β secretion by NK and T cells, revealing an immunoregulatory signaling output.

    Evidence CD69−/− mice tumor challenge, adoptive transfer, in vitro CD69 engagement with TGF-β measurement

    PMID:12732655

    Open questions at the time
    • Whether TGF-β induction requires specific signaling intermediates was not resolved
    • Identity of endogenous CD69 ligand triggering TGF-β remained unknown
  9. 2007 High

    Identifying a cytoskeletal checkpoint for CD69 surface delivery: L-plastin phosphorylation at Ser5 was required for CD69 transport to the T cell surface, revealing post-translational control of CD69 surface expression independent of transcription.

    Evidence Mass spectrometry of L-plastin phosphorylation, S5A mutagenesis, lentiviral expression in primary T cells, flow cytometry

    PMID:17294403

    Open questions at the time
    • Whether L-plastin directly binds CD69-containing vesicles or acts indirectly through actin remodeling was not determined
  10. 2010 High

    Solving the molecular mechanism of lymphocyte tissue retention: CD69 was shown to associate with S1PR1 via transmembrane contacts (requiring S1PR1-TM4), promoting S1PR1 internalization and degradation; simultaneously, CD69's cytoplasmic tail was found to engage Jak3/Stat5, suppressing RORγt and Th17 differentiation.

    Evidence Domain-swap and TM4 mutagenesis with co-IP and in vivo egress assays; CD69−/− T cell Jak3/Stat5 biochemistry with IL-2 rescue

    PMID:20463015 PMID:20696842

    Open questions at the time
    • Atomic-resolution structure of the CD69–S1PR1 interface was lacking
    • Whether Jak3/Stat5 association is direct or mediated by an adaptor was not resolved
  11. 2014 High

    Identifying the first natural extracellular ligands: galectin-1 on dendritic cells was identified as a carbohydrate-dependent CD69 ligand that mediates suppression of Th17 differentiation, establishing a receptor-ligand axis for CD69's immunomodulatory function.

    Evidence Recombinant CD69 pulldown from DCs followed by mass spectrometry, SPR binding, blocking antibodies, Th17 differentiation assays

    PMID:24752896

    Open questions at the time
    • Binding affinity and stoichiometry were not fully characterized
    • Whether galectin-1 binding triggers the same intracellular pathways as antibody cross-linking was not tested
  12. 2015 High

    Extending the ligand repertoire and demonstrating tissue-resident memory formation: S100A8/S100A9 was identified as a glycosylation-dependent CD69 ligand that signals via SOCS3/STAT3 to promote Treg differentiation; CD69 expression on skin CD8 T cells was shown to be essential for tissue-resident memory (TRM) formation via S1PR1 suppression.

    Evidence Co-IP/MS identification of S100A8/S100A9, glycomics, STAT3 signaling assays; skin T cell transfer with S1PR1 transcriptional analysis

    PMID:25624457 PMID:26296369

    Open questions at the time
    • Structural basis of glycan-dependent S100A8/S100A9 binding was unknown
    • Whether S100A8/S100A9 and galectin-1 compete for the same binding site was not addressed
  13. 2016 High

    Revealing a metabolic function: CD69 was found to associate with the LAT1-CD98 amino acid transporter, controlling its surface expression and L-tryptophan uptake, which feeds AhR activation and IL-22 secretion in γδ T cells driving psoriatic inflammation.

    Evidence Co-IP of CD69 with LAT1-CD98, L-Trp uptake assays in CD69−/− vs WT γδ T cells, AhR inhibitor and IL-22 neutralization, CD69−/− psoriasis model

    PMID:27376471

    Open questions at the time
    • Whether CD69–LAT1 interaction is direct or mediated by CD98 was not determined
    • Relevance beyond γδ T cells was not established
  14. 2017 High

    Adding hypoxia-responsive transcriptional control: HIF-1α was shown to directly transactivate CD69 through an HRE, explaining CD69 upregulation in hypoxic tumor microenvironments and providing a mechanism for hypoxia-driven lymphocyte tissue retention.

    Evidence ChIP for HIF-1α at CD69 HRE, conditional HIF-1α knockout T cells, pimonidazole labeling in vivo

    PMID:28507790

    Open questions at the time
    • Relative contribution of HIF-1α vs AP-1 in tumor contexts was not quantified
    • Whether HIF-1α-induced CD69 mediates S1PR1 internalization specifically in tumors was not tested
  15. 2022 High

    Connecting CD69 to ectonucleotidase-mediated immunosuppression: CD69 on Tregs was shown to promote AhR-dependent CD39 activity, inducing γδ T cell apoptosis and reducing IL-17A production; this pathway is cardioprotective after myocardial infarction.

    Evidence CD69−/− mouse LAD ligation, AhR inhibitor, adoptive transfer of CD69+ Tregs, CD39 activity assays, apoptosis assays

    PMID:36066993

    Open questions at the time
    • Whether CD69 directly activates AhR or acts through tryptophan metabolite changes was not distinguished
    • Relevance to other tissue injury models was not tested
  16. 2023 High

    Providing atomic-resolution proof that CD69 is a GPCR protein agonist: cryo-EM of the CD69–S1PR1–Gi complex revealed that one CD69 TM helix contacts S1PR1-TM4, allosterically displacing TM5-6 to activate Gi coupling, definitively establishing the structural mechanism of CD69-mediated S1PR1 internalization and lymphocyte retention.

    Evidence Cryo-EM structure determination of CD69–S1PR1–Gi ternary complex, interface mutagenesis, receptor internalization assays

    PMID:37039481

    Open questions at the time
    • Whether the second CD69 protomer in the homodimer can simultaneously engage another S1PR1 molecule is unknown
    • The structure was obtained in detergent — lipid bilayer effects on the interface remain untested

Open questions

Synthesis pass · forward-looking unresolved questions
  • Key unresolved questions include whether CD69's multiple cis-membrane partners (S1PR1, LAT1-CD98) can be simultaneously engaged, how the short cytoplasmic tail recruits both Jak3/Stat5 and Syk/PLCγ2 pathways in different cell types, and whether additional physiological soluble ligands exist beyond galectin-1 and S100A8/S100A9.
  • No reconstitution of simultaneous CD69–S1PR1 and CD69–LAT1 complexes
  • Structural basis of cytoplasmic tail signaling selectivity is unknown
  • Comprehensive ligand screening has not been performed

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0060089 molecular transducer activity 3 GO:0098772 molecular function regulator activity 3 GO:0060090 molecular adaptor activity 2
Localization
GO:0005886 plasma membrane 5 GO:0005829 cytosol 1
Pathway
R-HSA-168256 Immune System 7 R-HSA-162582 Signal Transduction 5 R-HSA-109582 Hemostasis 1
Partners
JAK3LGALS1S100A8S100A9S1PR1SLC3A2SLC7A5SYK
Complex memberships
CD69 homodimerCD69-S1PR1-Gi complex

Evidence

Reading pass · 28 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
1989 CD69 cross-linking by mAb induces prolonged elevation of intracellular Ca2+ (mostly via extracellular Ca2+ influx); when PKC is simultaneously activated by PMA, CD69 stimulation drives IL-2 and IFN-γ gene expression, CD25 upregulation, and T cell proliferation; cyclosporin A abolishes these gene expression effects. mAb cross-linking of CD69 on human T cells, Ca2+ flux measurements, cytokine gene expression assays, pharmacological inhibitors (PMA, cyclosporin A) Journal of immunology High 2501389
1990 CD69 is constitutively expressed on human platelets as a phosphorylated disulfide-linked homodimer; anti-CD69 mAb cross-linking induces platelet aggregation, Ca2+ influx, degranulation (ATP release), and production of thromboxane B2 and PGE2, indicating activation of arachidonic acid metabolism via cyclooxygenase. Biochemical characterization (SDS-PAGE), anti-CD69 mAb stimulation of platelets, Ca2+ influx assay, ATP release assay, thromboxane/PGE2 measurement The Journal of experimental medicine High 2388032
1992 In neutrophils, CD69 is stored intracellularly (in a trans-Golgi structure, as brefeldin A does not block surface expression but cycloheximide does not inhibit either, since new synthesis is not required) and is rapidly mobilized to the cell surface upon PMA or fMLP activation independent of new protein synthesis; CD69 stimulation in neutrophils induces Ca2+ influx and enhances lysozyme release (granule exocytosis) via a Ca2+-dependent mechanism. Flow cytometry, cycloheximide and brefeldin A pharmacological inhibition, immunoprecipitation, Ca2+ influx assay, lysozyme release assay Cellular immunology Medium 1586955
1993 CD69 cDNA encodes a 199-amino-acid type II transmembrane protein with a C-type lectin-like extracellular domain; the gene maps to chromosome 12p13-p12; its mRNA is rapidly induced and degraded after lymphocyte stimulation due to 3' UTR degradation signals; transient expression of the CD69 cDNA in COS-7 cells reproduced native CD69 properties. PCR-based cDNA cloning, sequence analysis, COS-7 transient expression, somatic cell hybrid DNA analysis and FISH chromosomal mapping The Journal of experimental medicine High 8340758
1993 CD69 expression is induced on thymocytes undergoing positive selection only when PKC-dependent signaling is engaged; PKC activator PMA induces CD69 on all thymocytes regardless of selecting MHC ligands, whereas TCR cross-linking induces CD69 only on thymocytes that have undergone or are undergoing positive selection. TCR-transgenic thymocyte cultures, anti-TCR antibody and PMA stimulation, flow cytometry European journal of immunology Medium 8095460
1994 Constitutively active v-Ha-ras induces CD69 surface expression in Jurkat T cells, and dominant-negative c-Ha-ras-N17 suppresses TCR/CD3-mediated CD69 induction, demonstrating that p21ras activation is required for TCR-mediated CD69 expression. Transfection of constitutively active and dominant-negative ras constructs in Jurkat cells, flow cytometry, ras GTP-loading immunoprecipitation, AP-1-CAT reporter assay European journal of immunology High 7907294
1997 CD69 gene expression is regulated by the transcription factor AP-1; stimuli that induce AP-1 but not NF-κB upregulate CD69 promoter activity, mRNA, and surface expression; a dominant-negative c-jun abolishes inducible CD69 transcription; an AP-1 binding site at position -16 of the CD69 promoter is transactivated by c-jun expression vectors. CD69 promoter-reporter transfection assays, EMSA, dominant-negative c-jun cotransfection, pharmacological inhibitors (pyrrolidine dithiocarbamate), IκB cotransfection Journal of immunology High 9580241
2000 Crystal structure of the C-type lectin-like domain (NKD) of human CD69 was determined in two crystal forms; CD69 NKD adopts the canonical CTLD fold but lacks Ca2+ and carbohydrate binding features; it dimerizes noncovalently through a hydrophobic core with polar interactions including an interdomain β-sheet; a hydrophobic surface patch surrounded by conserved charged residues likely constitutes the ligand-binding site. X-ray crystallography (two crystal forms), solution dimerization analysis The Journal of biological chemistry High 11036086
2000 CD69 engagement activates ERK (a MAPK family member), and this ERK activation is required for CD69-mediated cell degranulation in NK cells; co-engagement of the inhibitory receptor CD94/NKG2-A suppresses both CD69-triggered ERK activation and cell degranulation/cytotoxicity. RBL transfectants co-expressing CD69 and CD94/NKG2-A, ERK phosphorylation assays, degranulation assays, human NK cytotoxicity assays European journal of immunology Medium 10671222
2000 The cytoplasmic domain of CD69 mediates Ca2+-dependent signaling (dependent on extracellular Ca2+ uptake) and TNF-α production; the neck region (Cys68) is critical for CD69 dimerization; domain swap chimeras between CD69 and CD23 showed that the cytoplasmic domain, not receptor oligomerization, determines the type of signal transduced. CD69/CD23 chimeric receptor domain-swapping, transfection in RBL-2H3 and Jurkat cells, Ca2+ flux assay, serotonin release assay, TNF-α measurement Journal of immunology High 11034393
2002 CD69 cross-linking in IL-2-activated human NK cells rapidly activates Syk (but not ZAP70) in a Src family kinase (including Lck)-dependent manner; Syk and Src kinases then control tyrosine phosphorylation of PLCγ2 and the Rho GEF Vav1, and together regulate CD69-triggered NK cell cytotoxicity. Anti-CD69 mAb cross-linking, immunoprecipitation, tyrosine phosphorylation assays, kinase activity assays, pharmacological inhibitors, RBL transfectants stably expressing CD69 Journal of immunology High 12077230
2002 Constitutive overexpression of CD69 on T cells throughout development (CD69 transgenic mice) causes accumulation of phenotypically mature thymocytes in the medulla and failure of thymocyte export from the thymus, without affecting T cell maturation or TCR signaling, identifying a role for CD69 in controlling thymocyte egress. CD69 transgenic mouse generation, flow cytometry of thymic subsets, T cell maturation and selection analysis International immunology High 12039905
2003 CD69-deficient mice show enhanced NK cell and T cell anti-tumor responses associated with increased MCP-1 chemokine production, decreased TGF-β production, and decreased lymphocyte apoptosis; CD69 engagement directly induces NK and T cell production of TGF-β, establishing a mechanistic link between CD69 signaling and TGF-β-mediated immunosuppression. CD69-/- mice tumor challenge, adoptive transfer, anti-CD69 antibody treatment in vivo, TGF-β production assays after CD69 engagement The Journal of experimental medicine High 12732655
2007 Phosphorylation of the actin-bundling protein L-plastin at Ser5 (induced by costimulation via TCR/CD3 plus CD2 or CD28) is required for transport of CD69 (and CD25) to the T cell surface; non-phosphorylatable 5A-L-plastin impairs surface expression of CD69 without affecting total CD69 protein levels. Mass spectrometry identification of phosphorylation site, site-directed mutagenesis of L-plastin (S5A), lentiviral expression in primary T cells, flow cytometry, immunological synapse imaging European journal of immunology High 17294403
2009 CD69 gene transcription in T cells is regulated by evolutionarily conserved non-coding sequences (CNS1-4) upstream of the promoter; these elements function as inducible enhancers (CNS2, CNS4) or suppressors (CNS1, CNS2 together), and together with the promoter enable developmental-stage and lineage-specific regulation of CD69 in T but not B cells. DNase I hypersensitivity mapping, ChIP for histone modifications, transient transfection enhancer assays, transgenic reporter mice Journal of immunology High 19841192
2010 CD69 associates with S1P1 via its transmembrane and membrane-proximal domains (specifically requiring S1P1 transmembrane helix 4); this interaction suppresses S1P1 function, prolongs S1P binding half-life, and promotes S1P1 internalization and degradation, thereby retaining T cells in lymphoid tissues; a non-S1P1-binding CD69 mutant fails to inhibit T cell egress. Domain swap experiments between CD69 and NKRp1A, S1P1 mutagenesis (glycosylation, sulfation, desensitization motifs, TM helix 4), co-immunoprecipitation, S1P binding half-life assay, in vivo T cell egress assay The Journal of biological chemistry High 20463015
2010 The cytoplasmic tail of CD69 associates with the Jak3/Stat5 signaling pathway; CD69 deficiency leads to impaired Jak3/Stat5 activity, reduced RORγt transcription inhibition, and consequently enhanced Th17 differentiation; selective Jak3 inhibition enhances RORγt transcription, and exogenous IL-2 restores Stat5 phosphorylation and suppresses enhanced Th17 differentiation in CD69-deficient cells. CD69-/- mouse T cell differentiation assays, biochemical co-immunoprecipitation of CD69 cytoplasmic tail with Jak3/Stat5, Stat5 phosphorylation assays, Jak3 inhibitor experiments, IL-2 rescue experiments, RORγt mRNA quantitation Molecular and cellular biology High 20696842
2012 CD69-deficient effector CD4 T cells fail to relocate into and persist in the bone marrow, and consequently fail to differentiate into resting memory Th cells; this leads to defective generation of high-affinity antibodies and bone marrow long-lived plasma cells, establishing a role for CD69 in memory Th cell formation and bone marrow homing. CD69-/- mouse immunization models, flow cytometry of bone marrow T cell subsets, antibody affinity measurement, ELISPOT for plasma cells PNAS High 22474373
2014 Galectin-1 on dendritic cells is a natural ligand for CD69; CD69 binds galectin-1 in a direct, carbohydrate-dependent interaction as confirmed by surface plasmon resonance and anti-CD69 blocking; this CD69-galectin-1 interaction mediates the negative effect of galectin-1 on Th17 differentiation in both human and mouse T cells. Recombinant CD69 extracellular domain pulldown on dendritic cells followed by mass spectrometry, surface plasmon resonance, anti-CD69 blocking assays, Th17 differentiation functional assays Molecular and cellular biology High 24752896
2015 CD69 surface expression by skin-infiltrating CD8 T cells (regulated by local antigen stimulation and type I IFNR signaling) coincides with transcriptional downregulation of S1P1; CD69 expression, by interfering with S1P1 function, is a critical determinant of prolonged T cell retention and local TRM formation in skin. Skin-resident T cell transfer models, flow cytometry, transcriptional analysis of S1P1, in vivo T cell retention assays Journal of immunology High 25624457
2015 CD69 associates with the S100A8/S100A9 heterodimer (identified by co-immunoprecipitation and mass spectrometry); this interaction is glycosylation-dependent (N-linked glycans including sialic acid on CD69 are required); CD69-S100A8/S100A9 association upregulates SOCS3, thereby inhibiting STAT3 signaling and supporting TGF-β secretion and regulatory T cell differentiation. Immunoprecipitation and mass spectrometry, glycomics analysis of CD69, competition assay, PNGase F treatment, RNA interference, STAT3 signaling assays, Treg differentiation assays FASEB journal Medium 26296369
2016 CD69 associates with the aromatic amino acid transporter complex LAT1-CD98 (SLC7A5-SLC3A2) on the surface of γδ T cells and regulates its surface expression and L-tryptophan uptake; this controls intracellular L-Trp-derived AhR activators, leading to AhR-dependent IL-22 secretion and skin inflammation in psoriasis. Co-immunoprecipitation of CD69 with LAT1-CD98, flow cytometry of LAT1-CD98 surface expression in CD69-/- vs WT γδ T cells, L-Trp uptake assays, AhR inhibitor and IL-22 neutralization experiments, CD69-/- mouse IL-23-induced psoriasis model Nature immunology High 27376471
2017 HIF-1α directly transactivates the CD69 gene through a hypoxia response element (HRE) in the human CD69 locus; T cells in hypoxic conditions or hypoxic tumor microenvironments upregulate CD69 mRNA and protein in a HIF-1α-dependent manner. ChIP demonstrating HIF-1α binding to CD69 HRE, HIF-1α inducible knockout T cells, pimonidazole hypoxia labeling in vivo, quantitative RT-PCR and flow cytometry under hypoxia Oncoimmunology High 28507790
2018 CD69 overexpression in Tregs stimulates higher IL-10 production through STAT3 and STAT5 signaling pathways, with STAT3 directly binding the c-Maf promoter to drive c-Maf-dependent IL-10 expression; CD69+ Tregs but not CD69- Tregs or IL-10-deficient CD69+ Tregs prevent inflammatory bowel disease development after adoptive transfer. CD69 overexpression in Tregs, STAT3/STAT5 siRNA silencing, ChIP demonstrating STAT3 binding to c-Maf promoter, adoptive transfer into IBD mouse model, IL-10 ELISA Cell death & disease Medium 30185773
2018 CD69 targeting with anti-CD69 mAb induces rapid mobilization of bone marrow leukocytes (including hematopoietic stem and progenitor cells) through S1P-dependent mechanisms (blocked by FTY720), and this mobilization is accompanied by increased mTOR/p70S6K/S6/4E-BP1 phosphorylation; mTOR inhibition with rapamycin blocks anti-CD69-induced HSPC mobilization. In vivo anti-CD69 mAb treatment, FTY720 blockade, AMD3100 comparison, flow cytometry of HSPC subsets, phosphorylation assays of mTOR pathway components, rapamycin inhibition Leukemia Medium 29483712
2022 CD69 expression on Tregs promotes AhR-dependent CD39 ectonucleotidase activity, which induces apoptosis of γδ T cells and decreases their IL-17A production; in CD69-/- mice after myocardial infarction, enhanced IL-17+ γδT cell responses worsen cardiac function; adoptive transfer of CD69+ Tregs into CD69-/- mice reduces IL-17+ γδT cell recruitment and increases survival. Cd69-/- mouse LAD ligation model, AhR inhibitor experiments, adoptive transfer of CD69+ Tregs, flow cytometry, CD39 ectonucleotidase activity assays, apoptosis assays The Journal of clinical investigation High 36066993
2023 Cryo-EM structure of CD69-bound S1PR1 coupled to heterotrimeric Gi reveals that the transmembrane helix of one CD69 homodimer protomer contacts S1PR1-TM4; this interaction allosterically induces movement of S1PR1-TM5-6, directly activating the receptor and engaging Gi; CD69 thus acts as a protein agonist (in cis) of S1PR1, promoting Gi-dependent S1PR1 internalization, loss of S1P gradient sensing, and inhibition of lymphocyte egress. Key interface mutations reduce CD69-S1PR1 interaction and receptor internalization. Cryo-EM structure determination of CD69-S1PR1-Gi complex, mutagenesis of interface residues, receptor internalization assays eLife High 37039481
2005 CD69 associates with an N-terminal fragment of calreticulin expressed at the surface of human PBMCs, as identified by co-immunoprecipitation followed by direct protein sequencing (LC/MS/MS). Co-immunoprecipitation and LC/MS/MS protein sequencing from primary human PBMCs Archives of biochemistry and biophysics Low 15893733

Source papers

Stage 0 corpus · 100 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2017 CD69: from activation marker to metabolic gatekeeper. European journal of immunology 730 28475283
1994 The activation antigen CD69. Stem cells (Dayton, Ohio) 453 7804122
2015 Cutting edge: CD69 interference with sphingosine-1-phosphate receptor function regulates peripheral T cell retention. Journal of immunology (Baltimore, Md. : 1950) 428 25624457
1994 The CD69 receptor: a multipurpose cell-surface trigger for hematopoietic cells. Immunology today 396 7945773
1989 T cell activation via Leu-23 (CD69). Journal of immunology (Baltimore, Md. : 1950) 266 2501389
1993 Molecular cloning, expression, and chromosomal localization of the human earliest lymphocyte activation antigen AIM/CD69, a new member of the C-type animal lectin superfamily of signal-transmitting receptors. The Journal of experimental medicine 263 8340758
1993 CD69 expression during selection and maturation of CD4+8+ thymocytes. European journal of immunology 250 8095460
2010 CD69 suppresses sphingosine 1-phosophate receptor-1 (S1P1) function through interaction with membrane helix 4. The Journal of biological chemistry 249 20463015
1999 Early CD69 expression on peripheral blood lymphocytes from children with dengue hemorrhagic fever. The Journal of infectious diseases 161 10515800
1993 CD69 is expressed by human eosinophils activated in vivo in asthma and in vitro by cytokines. Immunology 139 8262555
2003 Enhanced antitumor immunity in mice deficient in CD69. The Journal of experimental medicine 138 12732655
1994 Involvement of p21ras activation in T cell CD69 expression. European journal of immunology 127 7907294
2002 A potential role for CD69 in thymocyte emigration. International immunology 125 12039905
2012 Type II membrane protein CD69 regulates the formation of resting T-helper memory. Proceedings of the National Academy of Sciences of the United States of America 117 22474373
2010 CD69 association with Jak3/Stat5 proteins regulates Th17 cell differentiation. Molecular and cellular biology 111 20696842
1990 CD69 is expressed on platelets and mediates platelet activation and aggregation. The Journal of experimental medicine 104 2388032
2016 CD69 controls the uptake of L-tryptophan through LAT1-CD98 and AhR-dependent secretion of IL-22 in psoriasis. Nature immunology 101 27376471
2018 CD69 enhances immunosuppressive function of regulatory T-cells and attenuates colitis by prompting IL-10 production. Cell death & disease 92 30185773
2007 Costimulation induced phosphorylation of L-plastin facilitates surface transport of the T cell activation molecules CD69 and CD25. European journal of immunology 89 17294403
2000 Phenotypic and functional characteristics of hematopoietic cell lineages in CD69-deficient mice. Blood 88 10733501
1997 Expression of the leukocyte early activation antigen CD69 is regulated by the transcription factor AP-1. Journal of immunology (Baltimore, Md. : 1950) 86 9580241
2014 The leukocyte activation receptor CD69 controls T cell differentiation through its interaction with galectin-1. Molecular and cellular biology 83 24752896
1997 Temporal dynamics of CD69 expression on lymphoid cells. Journal of immunological methods 83 9448032
1998 CD44 and CD69 represent different types of cell-surface activation markers for human eosinophils. American journal of respiratory cell and molecular biology 81 9618391
2014 Maintenance of immune tolerance by Foxp3+ regulatory T cells requires CD69 expression. Journal of autoimmunity 79 24934597
2018 Crucial role of CD69 in anti-tumor immunity through regulating the exhaustion of tumor-infiltrating T cells. International immunology 78 30085193
2016 Human Lymphoid Tissues Harbor a Distinct CD69+CXCR6+ NK Cell Population. Journal of immunology (Baltimore, Md. : 1950) 78 27226093
1999 Brefeldin A, but not monensin, completely blocks CD69 expression on mouse lymphocytes: efficacy of inhibitors of protein secretion in protocols for intracellular cytokine staining by flow cytometry. Journal of immunological methods 73 10357208
1996 Ligation of CD69 induces apoptosis and cell death in human eosinophils cultured with granulocyte-macrophage colony-stimulating factor. Blood 72 8639899
2000 Crystal structure of the C-type lectin-like domain from the human hematopoietic cell receptor CD69. The Journal of biological chemistry 70 11036086
2015 Glycosylation-dependent interaction between CD69 and S100A8/S100A9 complex is required for regulatory T-cell differentiation. FASEB journal : official publication of the Federation of American Societies for Experimental Biology 65 26296369
1992 CD69 molecule in human neutrophils: its expression and role in signal-transducing mechanisms. Cellular immunology 64 1586955
2010 The leukocyte activation antigen CD69 limits allergic asthma and skin contact hypersensitivity. The Journal of allergy and clinical immunology 63 20621339
2021 The Clinical Significance of Hepatic CD69+ CD103+ CD8+ Resident-Memory T Cells in Autoimmune Hepatitis. Hepatology (Baltimore, Md.) 60 33554350
2000 CD69-triggered ERK activation and functions are negatively regulated by CD94 / NKG2-A inhibitory receptor. European journal of immunology 59 10671222
1999 CD69 expression discriminates MHC-dependent and -independent stages of thymocyte positive selection. Journal of immunology (Baltimore, Md. : 1950) 58 10201918
1993 Expression of CD69 antigen on synovial fluid T cells in patients with rheumatoid arthritis and other chronic synovitis. Annals of the rheumatic diseases 57 8323399
2002 Activation markers of human basophils: CD69 expression is strongly and preferentially induced by IL-3. The Journal of allergy and clinical immunology 55 11994706
2000 Vav modulation of the Ras/MEK/ERK signaling pathway plays a role in NFAT activation and CD69 up-regulation. European journal of immunology 54 10898494
2005 Induction of tumor NK-cell immunity by anti-CD69 antibody therapy. Blood 53 15692061
2011 CD69: an unexpected regulator of TH17 cell-driven inflammatory responses. Science signaling 49 21427408
2006 Phosphorylation of the LFA-1 integrin beta2-chain on Thr-758 leads to adhesion, Rac-1/Cdc42 activation, and stimulation of CD69 expression in human T cells. The Journal of biological chemistry 49 17107954
2015 Levels of regulatory T cells CD69(+)NKG2D(+)IL-10(+) are increased in patients with autoimmune thyroid disorders. Endocrine 48 26100786
2012 Mesenchymal stem cells promote the sustained expression of CD69 on activated T lymphocytes: roles of canonical and non-canonical NF-κB signalling. Journal of cellular and molecular medicine 48 21777379
2006 CD69 down-modulation and inhibition of thymic egress by short- and long-term selective chemical agonism of sphingosine 1-phosphate receptors. European journal of immunology 47 16342326
2009 CD69 gene is differentially regulated in T and B cells by evolutionarily conserved promoter-distal elements. Journal of immunology (Baltimore, Md. : 1950) 46 19841192
2022 Intrahepatic CD69+Vδ1 T cells re-circulate in the blood of patients with metastatic colorectal cancer and limit tumor progression. Journal for immunotherapy of cancer 45 35863820
1997 Expression and function of the early activation antigen CD69 in murine macrophages. Journal of leukocyte biology 45 9307073
2022 CD69 expression on regulatory T cells protects from immune damage after myocardial infarction. The Journal of clinical investigation 42 36066993
1995 CD69+ and HLA-DR+ activation antigens on peripheral blood lymphocyte populations in metastatic breast and ovarian cancer patients: correlations with survival following active specific immunotherapy. International journal of cancer 41 7538976
1997 Abnormalities in CD69 expression, cytosolic pH and Ca2+ during activation of lymphocytes from patients with systemic lupus erythematosus. Lupus 40 9116719
2018 Ketamine induces apoptosis in lung adenocarcinoma cells by regulating the expression of CD69. Cancer medicine 39 29453833
2019 CD69+ memory T lymphocytes of the bone marrow and spleen express the signature transcripts of tissue-resident memory T lymphocytes. European journal of immunology 38 30673129
2008 Increased expression of CD16, CD69, and very late antigen-1 on blood monocytes in active sarcoidosis. Chest 38 18641108
2020 Increased CD69 expression on activated eosinophils in eosinophilic chronic rhinosinusitis correlates with clinical findings. Allergology international : official journal of the Japanese Society of Allergology 37 31928947
2000 Functional analysis of ligand-binding and signal transduction domains of CD69 and CD23 C-type lectin leukocyte receptors. Journal of immunology (Baltimore, Md. : 1950) 37 11034393
2021 Implication of CD69+ CD103+ tissue-resident-like CD8+ T cells as a potential immunotherapeutic target for cholangiocarcinoma. Liver international : official journal of the International Association for the Study of the Liver 35 33548061
2002 Src-dependent Syk activation controls CD69-mediated signaling and function on human NK cells. Journal of immunology (Baltimore, Md. : 1950) 35 12077230
2007 Sphingosine-1-phosphate reduces CD4+ T-cell activation in type 1 diabetes through regulation of hypoxia-inducible factor short isoform I.1 and CD69. Diabetes 34 18003758
2017 CD69 is a direct HIF-1α target gene in hypoxia as a mechanism enhancing expression on tumor-infiltrating T lymphocytes. Oncoimmunology 32 28507790
2016 Immune-Regulatory Molecule CD69 Controls Peritoneal Fibrosis. Journal of the American Society of Nephrology : JASN 32 27151919
2014 Human hepatocellular carcinoma-infiltrating CD4⁺CD69⁺Foxp3⁻ regulatory T cell suppresses T cell response via membrane-bound TGF-β1. Journal of molecular medicine (Berlin, Germany) 32 24668348
2007 CLEC2A: a novel, alternatively spliced and skin-associated member of the NKC-encoded AICL-CD69-LLT1 family. Immunogenetics 32 18046548
2001 CD69 expression on peripheral CD4+ T cells parallels disease activity and is reduced by mycophenolate mofetil therapy in uveitis. Investigative ophthalmology & visual science 32 11328741
2022 The cellular and molecular basis of CD69 function in anti-tumor immunity. International immunology 31 35689672
2007 Chicken CD69 and CD94/NKG2-like genes in a chromosomal region syntenic to mammalian natural killer gene complex. Immunogenetics 31 17505822
1995 Characterization and regulation of CD69 expression on rheumatoid arthritis synovial fluid T cells. The Journal of rheumatology 31 7783055
2018 Combined CD25, CD64, and CD69 biomarker panel for flow cytometry diagnosis of sepsis. Talanta 29 30262053
2020 Synovial fluid CD69+CD8+ T cells with tissue-resident phenotype mediate perforin-dependent citrullination in rheumatoid arthritis. Clinical & translational immunology 28 32528679
2023 The Expression of Activation Markers CD25 and CD69 Increases during Biologic Treatment of Psoriasis. Journal of clinical medicine 27 37892710
2023 Lung-resident CD69+ST2+ TH2 cells mediate long-term type 2 memory to inhaled antigen in mice. The Journal of allergy and clinical immunology 26 36720287
2023 Transmembrane protein CD69 acts as an S1PR1 agonist. eLife 26 37039481
2023 The roles of toll-like receptor 4, CD33, CD68, CD69, or CD147/EMMPRIN for monocyte activation by the DAMP S100A8/S100A9. Frontiers in immunology 26 37056775
2011 Distinct expression patterns of CD69 in mucosal and systemic lymphoid tissues in primary SIV infection of rhesus macaques. PloS one 25 22096538
2009 Human NK Cell Up-regulation of CD69, HLA-DR, Interferon γ Secretion and Cytotoxic Activity by Plasmacytoid Dendritic Cells is Regulated through Overlapping but Different Pathways. Sensors (Basel, Switzerland) 25 22389607
2022 CD69 and SBK1 as potential predictors of responses to PD-1/PD-L1 blockade cancer immunotherapy in lung cancer and melanoma. Frontiers in immunology 24 36045683
2019 CD4+CD69+ T cells and CD4+CD25+FoxP3+ Treg cells imbalance in peripheral blood, spleen and peritoneal lavage from pristane-induced systemic lupus erythematosus (SLE) mice. Advances in rheumatology (London, England) 24 31340848
2008 The chemokine interleukin-8 and the surface activation protein CD69 are markers for Bcr-Abl activity in chronic myeloid leukemia. Molecular oncology 24 19383348
2005 Human CD69 associates with an N-terminal fragment of calreticulin at the cell surface. Archives of biochemistry and biophysics 23 15893733
2004 Induction of CD69 antigen expression in peripheral blood mononuclear cells on exposure to silica, but not by asbestos/chrysotile-A. Immunology letters 23 15790520
2020 Inverse relationship between oligoclonal expanded CD69- TTE and CD69+ TTE cells in bone marrow of multiple myeloma patients. Blood advances 22 32986791
2020 Decreased Expression of CD69 on T Cells in Tuberculosis Infection Resisters. Frontiers in microbiology 21 32849474
2018 Anti-CD69 therapy induces rapid mobilization and high proliferation of HSPCs through S1P and mTOR. Leukemia 21 29483712
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1998 Expression of CD69 activation marker by endometrial granulated lymphocytes throughout the menstrual cycle and in early pregnancy. Immunology 21 9767419
2024 Personalized neoantigen hydrogel vaccine combined with PD-1 and CTLA-4 double blockade elicits antitumor response in liver metastases by activating intratumoral CD8+CD69+ T cells. Journal for immunotherapy of cancer 20 39694701
2018 Reactive glia promote development of CD103+ CD69+ CD8+ T-cells through programmed cell death-ligand 1 (PD-L1). Immunity, inflammation and disease 20 29602245
2002 CD69 expression on lymphocytes and interleukin-15 levels in synovial fluids from different inflammatory arthropathies. Rheumatology international 20 11958434
2024 Integrative analysis discovers Imidurea as dual multitargeted inhibitor of CD69, CD40, SHP2, lysozyme, GATA3, cCBL, and S-cysteinase from SARS-CoV-2 and M. tuberculosis. International journal of biological macromolecules 19 38768914
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2019 Detection of culture-negative sepsis in clinical blood samples using a microfluidic assay for combined CD64 and CD69 cell capture. Analytica chimica acta 19 30947986
2021 Discovery, optimization and biodistribution of an Affibody molecule for imaging of CD69. Scientific reports 18 34580321
2005 Enhanced expression of CD69 and CD25 antigen on human peripheral blood mononuclear cells by prolactin. Endocrine journal 18 16284445
2001 Anti-CD69 autoantibodies cross-react with low density lipoprotein receptor-related protein 2 in systemic autoimmune diseases. Journal of immunology (Baltimore, Md. : 1950) 18 11145721
2016 Distinct recirculation potential of CD69+CD103- and CD103+ thymic memory CD8+ T cells. Immunology and cell biology 17 27328704
2014 Increase of CD69, CD161 and CD94 on NK cells in women with recurrent spontaneous abortion and in vitro fertilization failure. Iranian journal of immunology : IJI 17 24975965
1998 Increased CD69 and human leukocyte antigen-DR expression on T lymphocytes in insulin-dependent diabetes mellitus of long standing. The Journal of clinical endocrinology and metabolism 17 9626161
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2012 Differential effect of CD69 targeting on bystander and antigen-specific T cell proliferation. Journal of leukocyte biology 16 22544938