{"gene":"NCR3","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1999,"finding":"NKp30 is a 30-kD activating receptor selectively expressed on all resting and activated human NK cells, belonging to the immunoglobulin superfamily with a single V-type domain and a charged transmembrane residue. NKp30 associates with CD3ζ chains that become tyrosine phosphorylated upon activation. NKp30 was identified as the product of the previously known 1C7 gene. mAb-mediated cross-linking induces strong NK activation; masking inhibits cytotoxicity against tumor and normal targets.","method":"Monoclonal antibody generation, molecular cloning of cDNA, co-immunoprecipitation with CD3ζ, redirected killing assays, masking assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — original identification with multiple orthogonal methods (cloning, biochemical association, functional assays), foundational paper replicated by many subsequent studies","pmids":["10562324"],"is_preprint":false},{"year":2001,"finding":"NK cell-mediated lysis of autologous antigen-presenting cells is triggered by engagement of NKp30 and NKp46, and is dependent on phosphatidylinositol 3-kinase (PI-3K) signaling; PI-3K inhibitors LY294002 and wortmannin blocked both APC lysis and NKp30-triggered activation, and also reduced Akt/PKB phosphorylation downstream of NKp30 engagement.","method":"NK cell/APC co-culture cytotoxicity assays, mAb masking, pharmacological PI-3K inhibition, redirected killing assay, Western blot for Akt/PKB phosphorylation","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (functional killing, pharmacological inhibition, signaling readout), replicated by subsequent studies","pmids":["11385609"],"is_preprint":false},{"year":2002,"finding":"NK cells recognize immature dendritic cells (iDCs) and kill them primarily via the NKp30 receptor; the NKp30 activating signal (not NKp46 or NKp44) is the major trigger for this NK-mediated DC killing. Mature DCs are protected from lysis unless MHC class I inhibitory signaling is blocked.","method":"NK/DC co-culture cytotoxicity assays, mAb-mediated receptor blocking, antibody-mediated HLA-A,B,C masking","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific mAb blocking of individual receptors with functional readout, replicated in multiple subsequent studies","pmids":["11828009"],"is_preprint":false},{"year":2003,"finding":"TGF-β1 down-regulates NKp30 surface expression at the transcriptional level, which in turn profoundly inhibits NK-mediated killing of dendritic cells. NKp30 down-regulation by TGF-β1 does not equally affect killing of all tumor lines, reflecting differential receptor usage.","method":"Flow cytometry for surface receptor expression, transcriptional analysis (gene regulation), NK cytotoxicity assays with TGF-β1 treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — transcriptional regulation demonstrated alongside functional cytotoxicity assays, replicated in subsequent TGF-β studies","pmids":["12646700"],"is_preprint":false},{"year":2005,"finding":"NK cell-mediated induction of DC maturation is dependent on NKp30 engagement: NKp30 ligation causes NK cells to produce TNF-α and IFN-γ, which in turn promote DC maturation. Masking NKp30 with mAbs strongly reduces DC maturation. Analysis of perforin-deficient NK cells showed that NKp30 can drive cytokine-dependent DC maturation independently of direct killing.","method":"NK/DC co-culture with mAb blocking of NKp30, cytokine neutralization with anti-TNF-α antibodies, supernatant transfer assays, analysis of perforin-deficient NK cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches including neutralization, supernatant transfer, and genetic (perforin-deficient) dissection of function","pmids":["15784725"],"is_preprint":false},{"year":2005,"finding":"The HCMV tegument protein pp65 directly binds NKp30 and inhibits NK cell cytotoxicity by causing dissociation of the associated CD3ζ signaling chain from NKp30, thereby reducing killing activity.","method":"Direct binding assays, co-immunoprecipitation of pp65 with NKp30, Western blot for CD3ζ dissociation, NK cytotoxicity assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding established with multiple biochemical methods, mechanistic dissection of CD3ζ dissociation, published in high-impact journal","pmids":["15821739"],"is_preprint":false},{"year":2004,"finding":"Membrane-associated heparan sulfate proteoglycans (HSPGs) on target cell surfaces are recognized by NKp30 (and NKp46); 6-O-sulfation and N-acetylation state of the glucosamine building unit affect this recognition. Tumor cells with reduced cell-surface heparan sulfate (via heparanase expression, CHO mutants, or glypican-1 knockdown) show reduced recognition and lysis by NK cells.","method":"Binding assays with recombinant NKp30-Fc fusion, NK cytotoxicity assays with heparan sulfate-deficient cell lines and enzymatic removal of HS, siRNA knockdown of glypican-1","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell-based systems with functional readouts, but contested by a subsequent study (Warren et al., PMID 15972650) showing HS is not required","pmids":["15294952"],"is_preprint":false},{"year":2005,"finding":"A study using complete enzymatic removal of heparan sulfate (HS) from multiple cell lines demonstrated that HS glycosaminoglycans are NOT ligands for NKp30, as removal of HS did not affect rNKp30-Fc binding or NKp30-dependent NK killing of target cells. This result contradicts the HSPG-ligand model.","method":"Mammalian heparanase treatment to remove HS from cell surfaces, rNKp30-Fc binding assays, NK cytotoxicity assays with HS-deficient vs. HS-expressing cells","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rigorous enzymatic removal approach with multiple cell types; negative result that directly challenges the HSPG ligand claim","pmids":["15972650"],"is_preprint":false},{"year":2007,"finding":"The nuclear protein BAT3/BAG-6 is released from tumor cells as a soluble factor, directly binds NKp30, and engages NKp30 on NK cells to trigger NKp30-mediated cytotoxicity. BAT3 was necessary for tumor rejection in a multiple myeloma model.","method":"Pulldown/co-immunoprecipitation of BAT3 with NKp30-Fc fusion protein, direct binding assays, NK cytotoxicity assays with BAT3 blocking/knockdown, in vivo multiple myeloma model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding established by pulldown and confirmed functionally both in vitro and in vivo, published in high-impact journal","pmids":["18055229"],"is_preprint":false},{"year":2009,"finding":"B7-H6, a new member of the B7 family encoded by a previously unannotated gene, is a tumor cell surface ligand for NKp30 that triggers NKp30-mediated NK cell activation and cytotoxicity. B7-H6 is expressed on tumor cells but not detected in normal human tissues.","method":"Recombinant NKp30-Fc binding screen, co-immunoprecipitation, NK cell activation and cytotoxicity assays, expression analysis of normal vs. tumor tissues","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — original identification of B7-H6 as NKp30 ligand with direct binding and functional validation, extensively replicated","pmids":["19528259"],"is_preprint":false},{"year":2009,"finding":"MDSCs from HCC patients inhibit autologous NK cell cytotoxicity and cytokine secretion in a cell-contact-dependent manner primarily through the NKp30 receptor on NK cells (not via arginase activity).","method":"In vitro co-culture of MDSCs and NK cells, mAb blocking of NKp30, cytotoxicity and cytokine secretion assays","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-contact and receptor blocking experiments, single lab, functional readout","pmids":["19551844"],"is_preprint":false},{"year":2009,"finding":"NKp30, NKp44, and NKp46 bind to different heparan sulfate/heparin sequences; NKp30 and NKp44 have approximately one order of magnitude higher affinity for synthetic HS/heparin than NKp46, and NCR binding to HS is relevant for binding to tumor cells and NK cell activation.","method":"Microarray with synthetic HS/heparin oligosaccharides, surface plasmon resonance binding assays","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro biophysical binding assays with rigorous SPR, but single study and HS-ligand role for NKp30 is contested in the field","pmids":["19196184"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of NKp30 bound to its tumor ligand B7-H6 was determined. NKp30 is a member of the CD28 family (includes CTLA-4 and PD-1) but uniquely engages B7-H6 using both front and back β-sheets of its Ig-like domain, resulting in engagement via the side and face of the β-sandwich. B7-H6 contacts NKp30 through CDR-like loops of its V-like domain in an antibody-like interaction distinct from other B7 family complexes.","method":"X-ray crystallography of NKp30/B7-H6 complex","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of receptor-ligand complex with detailed structural comparison, replicated by independent structure study (PMID 21444796)","pmids":["21422170"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the extracellular domain of NKp30 was determined, revealing an I-type Ig-like fold structurally distinct from NKp44 and NKp46. Peptide epitope mapping of a blocking antibody identified a critical ligand-binding region involving the F strand, C strand, and CD loop. Solution binding studies showed the N-terminal domain of B7-H6 is sufficient for NKp30 recognition; mutations near the F strand affect B7-H6 binding.","method":"X-ray crystallography, peptide epitope mapping, solution binding assays, site-directed mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis and binding assays, independent replication of structure","pmids":["21444796"],"is_preprint":false},{"year":2007,"finding":"The glycosylation state of recombinant NKp30 critically affects its ability to bind heparan sulfate; N-linked glycans on NKp30 can mask HS binding, and deglycosylation of improperly glycosylated recombinant NKp30 restores heparin/HS binding. Three N-glycosylation sites are present on NKp30, and differential glycosylation modulates ligand binding properties.","method":"Binding assays with six different recombinant NKp30 preparations, enzymatic deglycosylation (PNGase F treatment), direct heparin binding assays, NK cell activation assays","journal":"Glycobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple recombinant protein variants tested with enzymatic manipulation, single lab","pmids":["18006589"],"is_preprint":false},{"year":2007,"finding":"NKp30 ligation induces rapid activation of the canonical NF-κB pathway (IκB degradation, nuclear translocation of p65/p50 heterodimer) in NK cells within 30 minutes. This response was blocked by proteasome inhibitor MG132 and Syk inhibitor piceatannol, placing Syk upstream of NF-κB in the NKp30 signaling cascade.","method":"Immunoblotting for IκB degradation, EMSA with supershift for NF-κB subunit identification, fluorescence microscopy in single NK cells, κB-GFP reporter assay in NK92 cells, pharmacological inhibitors","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (biochemical, reporter, pharmacological) in multiple NK cell systems","pmids":["18025182"],"is_preprint":false},{"year":2007,"finding":"NKp30 is responsible for recognition and killing of Plasmodium falciparum-parasitized erythrocytes; NKp30-Ig fusion proteins and DBL-1α peptides block this interaction. The DBL-1α domain of PfEMP-1 on parasitized erythrocytes is a direct, specific ligand for NKp30, leading to perforin production and granzyme B release.","method":"NKp30-Ig fusion protein binding assays, DBL-1α peptide competition experiments, perforin and granzyme B measurement assays","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding and functional competition assays, single lab, limited follow-up","pmids":["17436233"],"is_preprint":false},{"year":2007,"finding":"In filovirus-infected dendritic cells, NK cell lysis is mediated through NKp30, as demonstrated by gene expression knockdown studies that directly linked NK lysis of infected DCs to NKp30 upregulation; perforin and CD95L (FasL) mediate the killing.","method":"Gene expression knockdown (siRNA), NK/DC cytotoxicity assays with infected vs. uninfected DCs, cytokine production measurement","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown directly linking NKp30 to functional outcome, single lab","pmids":["17381429"],"is_preprint":false},{"year":2008,"finding":"In uterine decidual NK cells (dNK), NKp30 (but not NKp46) engagement triggers production of IFN-γ, TNF-α, MIP-1α, MIP-1β, and GM-CSF, whereas NKp46 (but not NKp30) engagement induces calcium mobilization, perforin polarization, granule exocytosis, and cytolytic activity. This demonstrates a differential, receptor-specific functional split in dNK cells.","method":"Flow cytometry for receptor expression, mAb-specific receptor engagement assays, calcium mobilization assays, granule exocytosis, cytokine measurement, cytotoxicity assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — comprehensive functional dissection using multiple orthogonal methods with receptor-specific mAbs in primary dNK cells","pmids":["18713971"],"is_preprint":false},{"year":2011,"finding":"Poxviral hemagglutinin (HA) from vaccinia virus and ectromelia virus is a ligand for NKp30; HA present on VV-infected cells or as soluble protein blocks NKp30-triggered NK cell activation (while stimulating NKp46), representing an immune escape mechanism. Using NK cells with selectively silenced NKp30 expression (NCR-CD3ζ reporter cells), HA was shown to specifically block NKp30-mediated activation.","method":"NKp30 reporter cell assays (NCR-CD3ζ), siRNA silencing of individual NCRs, binding assays with recombinant HA, NK cytotoxicity assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — reporter cell assay plus siRNA silencing plus multiple binding approaches, mechanistic detail on opposing effects on NKp30 vs. NKp46","pmids":["21901096"],"is_preprint":false},{"year":2012,"finding":"NKp30-mediated signaling activates the Erk1/2 signaling pathway in NK cells upon contact with tumor target cells; NKp30 blockade decreases Erk1/2 phosphorylation, inhibits degranulation, cytotoxicity, and cytokine secretion but does not affect NK-target cell conjugation. NKp30 and LFA-1 co-accumulate at the NK immune synapse interface with tumor cells.","method":"Confocal microscopy for synapse formation, mAb blocking of NKp30, Western blot for Erk1/2 phosphorylation, degranulation and cytotoxicity assays","journal":"Immunological investigations","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (imaging, signaling, functional assays), single lab","pmids":["22101078"],"is_preprint":false},{"year":2012,"finding":"NKp30 is responsible for recognition and killing of fungal pathogens Cryptococcus and Candida by NK cells; NKp30 was required for NK cell-fungal conjugate formation, PI3K signaling, and perforin release. IL-12 restored NKp30 expression and fungal killing in HIV-infected patients with diminished NKp30.","method":"Unbiased receptor identification screen, blocking antibodies, NK-fungal conjugate formation assays, PI3K signaling assays, perforin release assays, IL-12 restoration experiments","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased identification approach combined with multiple functional readouts, mechanistic dissection of signaling requirements","pmids":["24139398"],"is_preprint":false},{"year":2012,"finding":"The stalk domain of NKp30 is an important module for ligand recognition and related signaling; mutational analysis of NKp30 showed differential binding affinities and signaling capacities for mono-, di-, or triglycosylated NKp30, suggesting that N-glycosylation degree provides a switch to modulate NKp30 ligand binding properties.","method":"NKp30-hIgG1-Fc fusion proteins with stalk region mutations, N-glycosylation site mutagenesis, binding assays, signaling assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — mutagenesis with functional readouts, but single lab and confirmatory of structural data","pmids":["22807449"],"is_preprint":false},{"year":2013,"finding":"A 250-amino acid C-terminal fragment of BAG-6 (BAG-6(686-936)) forms a noncovalent dimer and is sufficient for high-affinity NKp30 binding (KD <100 nM) and inhibition of NKp30-dependent NK cell signaling, IFN-γ release, and degranulation in the presence of tumor target cells.","method":"Domain mapping by truncation/fusion constructs, binding assays (KD measurement), NK cell functional assays (IFN-γ, degranulation), co-culture with tumor cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with defined domain, affinity measurement, and multiple functional readouts in single rigorous study","pmids":["24133212"],"is_preprint":false},{"year":2013,"finding":"B7-H6 is induced on non-transformed cells (proinflammatory CD14+CD16+ monocytes and neutrophils) upon TLR ligand stimulation or proinflammatory cytokines (IL-1β, TNF-α), producing both membrane-bound and soluble forms. In vivo, B7-H6 is expressed on monocytes during sepsis and soluble B7-H6 is associated with exosomal fractions in gram-negative sepsis.","method":"In vitro stimulation of monocytes/neutrophils with TLR ligands and cytokines, flow cytometry for surface expression, ELISA for soluble form, fractionation for exosomal association, in vivo patient serum analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell types and stimuli tested with both in vitro and in vivo validation, single lab","pmids":["23687088"],"is_preprint":false},{"year":2013,"finding":"B7-H6 surface expression on tumor cells is downregulated by histone deacetylase inhibitors (pan- or class I HDACi) and by siRNA-mediated knockdown of HDAC2 or HDAC3, correlating with reduced histone acetylation at the B7-H6 promoter. This B7-H6 downregulation reduces NKp30-dependent NK effector functions.","method":"Pharmacological HDACi treatment, siRNA knockdown of HDAC isoforms, B7-H6 reporter assays, chromatin immunoprecipitation (ChIP) at B7-H6 promoter, NK cell functional assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (pharmacological, genetic, ChIP, functional) establishing epigenetic regulation of the NKp30 ligand","pmids":["23801635"],"is_preprint":false},{"year":2014,"finding":"Soluble Galectin-3 released from tumor cells directly binds NKp30 (confirmed by NKp30-Fc immunoprecipitation and surface plasmon resonance), and this interaction specifically inhibits NKp30-mediated (but not NKG2D-mediated) NK cell cytolysis and CD107a expression. Galectin-3 knockdown in tumor cells increased NK lysis; Galectin-3 overexpression reduced lysis in vitro and in vivo.","method":"NKp30-Fc immunoprecipitation, surface plasmon resonance binding assay, NK cytotoxicity assays with recombinant Gal-3, shRNA knockdown and overexpression, xenograft mouse model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding confirmed by two independent methods plus in vitro and in vivo functional validation with genetic manipulation","pmids":["25315772"],"is_preprint":false},{"year":2014,"finding":"Tumor cells shed B7-H6 by ectodomain cleavage mediated by ADAM10 and ADAM17 metalloproteases; pharmacological inhibition or siRNA knockdown of ADAM10/17 increases cell-surface B7-H6 and enhances NKp30-mediated NK activation. Soluble B7-H6 is elevated in serum of melanoma patients.","method":"ADAM metalloprotease inhibitors, siRNA knockdown of ADAM10/ADAM17, flow cytometry for surface B7-H6, NK cell activation assays, patient serum ELISA","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacological and genetic (siRNA) approaches identifying specific sheddases with functional NK activation readout","pmids":["24780758"],"is_preprint":false},{"year":2007,"finding":"NKp44 (but not NKp30) recognizes hemagglutinins of influenza virus and Sendai virus; NKp30 does not bind viral hemagglutinins. This establishes a specificity distinction among natural cytotoxicity receptors.","method":"Binding assays with HA-expressing cells, NK cell killing assays with HA-expressing targets, receptor-specific mAb blocking","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — negative result for NKp30 HA binding shown with multiple experimental approaches, replicated in subsequent studies","pmids":["11536166"],"is_preprint":false},{"year":2007,"finding":"NKp30-mediated cytotoxicity is dependent on RAB27A (defective in Griscelli syndrome), whereas CD16-mediated killing is RAB27A independent. NKp30 engagement does not lead to Vav1 phosphorylation (unlike CD16), revealing a functional dichotomy in signaling pathways downstream of different NK activating receptors.","method":"Analysis of NK cells from a GS type 2 patient with RAB27A mutation, redirected killing assays, Western blotting for Vav1 phosphorylation after receptor-specific stimulation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — natural genetic experiment (GS patient) plus biochemical signaling analysis, mechanistically informative dichotomy","pmids":["17255357"],"is_preprint":false},{"year":2012,"finding":"NKp30 engagement on Vδ1 γδ T cells triggers production of high levels of CCL3/MIP-1α, CCL4/MIP-1β, and CCL5/RANTES (but not CXCL12), and this NKp30-induced CC-chemokine secretion suppresses replication of a CCR5-tropic strain of HIV-1 in CD4+/CCR5+ cells.","method":"mAb-mediated NKp30 engagement on Vδ1 T cells, gain-of-function and loss-of-function experiments, ELISA for chemokine production, HIV-1 replication assay in PM1 cell lines","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain- and loss-of-function experiments linking NKp30 engagement to specific chemokine secretion and functional antiviral consequence","pmids":["22403253"],"is_preprint":false},{"year":2015,"finding":"B7-H6 expressed on ovarian carcinoma cells or present as soluble form induces chronic NKp30 downregulation on tumor-associated NK cells, impairing IFN-γ production and cytolytic function specifically against B7-H6-expressing targets.","method":"Phenotypic analysis of tumor-associated NK cells from peritoneal fluids, flow cytometry for NKp30 and B7-H6 expression, NK cell functional assays","journal":"Oncoimmunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — correlative patient data with functional assays in vitro, single lab, no direct manipulation to establish causality","pmids":["26137398"],"is_preprint":false},{"year":2015,"finding":"NKp30 is expressed as three alternatively spliced isoforms (NKp30a, NKp30b, NKp30c) with different intracellular domains; these isoforms differentially polarize NK cell effector functions (immunostimulatory vs. immunosuppressive cytokine profiles). The balance of isoforms correlates with clinical outcomes in neuroblastoma patients.","method":"RT-PCR isoform quantification in patient NK cells, NK cell functional assays (cytokine profiles per isoform composition), clinical correlation in 196 patient cohort (3 independent cohorts)","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific functional characterization replicated in three independent patient cohorts with mechanistic underpinning","pmids":["25877893"],"is_preprint":false},{"year":2015,"finding":"The NKp30 ligand B7-H6 is expressed on salivary gland epithelial cells in primary Sjögren's syndrome (pSS), and a promoter polymorphism (rs11575837, G>A) in NCR3/NKp30 is associated with reduced gene transcription/function and protection from pSS. Circulating NKp30 levels correlate with NKp30-dependent (not CD16-dependent) IFN-γ secretion.","method":"Case-control genetic association study, NKp30 promoter reporter assays (rs11575837 functional characterization), NK cell functional assays (receptor-specific stimulation), immunohistochemistry of salivary glands for B7-H6","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — promoter polymorphism functionally validated with reporter assays plus receptor-specific functional dissection in patients and tissue","pmids":["23884468"],"is_preprint":false},{"year":2016,"finding":"The proto-oncogene c-Myc (and N-Myc) directly drives B7-H6 expression in tumor cells through a functional Myc-binding site in the B7-H6 promoter. Pharmacological inhibition or siRNA/shRNA knockdown of c-Myc or N-Myc significantly decreased B7-H6 expression, and Myc inhibition impaired NKp30-mediated degranulation of NK cells.","method":"Luciferase reporter assays with B7-H6 promoter, chromatin immunoprecipitation (ChIP) for Myc binding, pharmacological Myc inhibitors, siRNA/shRNA knockdown of c-Myc and N-Myc, NK cell degranulation assays","journal":"Oncoimmunology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — promoter ChIP plus reporter assay plus genetic manipulation with functional NK readout across multiple tumor types","pmids":["27622013"],"is_preprint":false},{"year":2017,"finding":"In acute promyelocytic leukemia, ILC2s express functional NKp30 and are activated via NKp30/B7-H6 interaction (along with CRTH2/PGD2). NKp30-activated ILC2s secrete IL-13 which activates monocytic MDSCs; blocking NKp30 partially restores ILC2 and MDSC levels and increases survival.","method":"Flow cytometry for ILC2 NKp30 expression, NKp30-blocking experiments in APL patient samples, IL-13 secretion assays, in vivo survival analysis after pathway blockade","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — NKp30 blocking experiments with functional readouts, in vivo survival data, single lab","pmids":["28928446"],"is_preprint":false},{"year":2015,"finding":"ILC2s express functional NKp30; engagement of NKp30 with its cognate ligand B7-H6 induces rapid production of type 2 cytokines by ILC2s, which can be blocked by NKp30-blocking antibody or the inhibitory ligand galectin-3. B7-H6 expression is upregulated in lesional skin of atopic dermatitis patients and by proinflammatory cytokines on keratinocytes.","method":"Flow cytometry for NKp30 on ILC2s, NKp30/B7-H6 stimulation assays, blocking antibody experiments, galectin-3 inhibition, ILC2 cytokine measurement","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor-ligand functional validation on ILC2s with blocking controls, single lab","pmids":["26582946"],"is_preprint":false},{"year":2020,"finding":"NKp30 oligomerization depends on its N-glycosylation: NKp30 forms oligomers when expressed with simple N-glycans (in HEK293S GnTI- cells) but is detected only as monomers after enzymatic deglycosylation. A crystal structure of glycosylated NKp30 in complex with B7-H6 reveals a new glycosylation-induced mode of NKp30 dimerization; the stalk region also affects oligomerization and ligand affinity.","method":"Size exclusion chromatography for oligomeric state, enzymatic deglycosylation, X-ray crystallography of glycosylated NKp30/B7-H6 complex, binding assays","journal":"Cancers","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus biochemical validation of glycosylation-dependent oligomerization in a single rigorous study","pmids":["32708305"],"is_preprint":false},{"year":2024,"finding":"IL-2 deprivation preferentially downregulates NKp30 (but not NKp46) expression on NK cells, impairing NKp30-dependent cytotoxicity against B7-H6-expressing leukemia cells. Ectopic overexpression of immunostimulatory NKp30 isoforms (NKp30a or NKp30b) overcomes this IL-2 deficiency-mediated dysfunction, and NKp30a overexpression improved tumor clearance in vivo without IL-2 supplementation.","method":"IL-2 deprivation experiments, NK92 and IL-2-producing NK92MI cell comparison, ectopic NKp30 isoform overexpression, in vitro cytotoxicity assays, in vivo xenograft THP-1 clearance model","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic overexpression plus in vivo model, mechanistic distinction between NKp30 and NKp46 regulation, single lab","pmids":["38698855"],"is_preprint":false},{"year":2019,"finding":"In HCC patients, NKp30-positive NK cells show a reduced expression of NCR3 immunostimulatory splice variants and increased inhibitory variant expression, resulting in deficient NKp30-mediated function. Exposure of NK cells to B7-H6-expressing HCC cells downmodulates NKp30 expression, and siRNA knockdown of B7-H6 prevents this downmodulation.","method":"NK cell phenotyping by flow cytometry, NCR3 isoform qPCR, NK cell functional assays, in vitro NK/HCC cell co-culture, siRNA knockdown of B7-H6","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods including siRNA functional validation of ligand-induced receptor downregulation, single lab","pmids":["30153337"],"is_preprint":false}],"current_model":"NKp30 (NCR3) is a V-type immunoglobulin superfamily activating receptor constitutively expressed on human NK cells (and inducible on some T cell and ILC subsets) that signals through associated CD3ζ via PI3K/Akt and Syk/NF-κB/Erk1/2 pathways to trigger cytotoxicity, cytokine secretion, and DC maturation (via TNF-α/IFN-γ); its major cellular ligands include B7-H6 (bound via the F/C strands and CD loop of NKp30's Ig domain in a structure determined by X-ray crystallography), BAG-6/BAT3, and Galectin-3, while viral immune evasion proteins (HCMV pp65, poxviral HA) and tumor-derived soluble ligands inhibit NKp30 by dissociating CD3ζ or blocking receptor engagement; expression and function are regulated at the transcriptional level by TGF-β1 (suppression), prolactin (induction), HDAC activity (epigenetic regulation of B7-H6 ligand via Myc), IL-2, and alternative splicing into immunostimulatory (NKp30a/b) versus immunosuppressive (NKp30c) isoforms that differentially polarize NK effector functions."},"narrative":{"mechanistic_narrative":"NCR3 (NKp30) is a V-type immunoglobulin superfamily activating receptor selectively expressed on human NK cells that drives cytotoxicity, cytokine secretion, and dendritic-cell editing as a core natural cytotoxicity receptor [PMID:10562324, PMID:11828009]. The receptor lacks intrinsic signaling motifs and instead associates non-covalently with CD3ζ chains, which are tyrosine-phosphorylated upon ligation [PMID:10562324]; downstream signaling proceeds through PI3K/Akt [PMID:11385609], a Syk→NF-κB cascade [PMID:18025182], and Erk1/2 [PMID:22101078], and effector killing requires RAB27A-dependent granule exocytosis rather than the Vav1 route used by CD16 [PMID:17255357]. Its principal activating tumor ligand is the B7-family protein B7-H6, which NKp30 engages through the F/C strands and CD loop of its Ig-like domain via an antibody-like interaction using both β-sheets of the V-domain [PMID:19528259, PMID:21422170, PMID:21444796]; the released nuclear protein BAG-6/BAT3 is a second activating ligand bound at high affinity by a defined C-terminal dimeric fragment [PMID:18055229, PMID:24133212]. NKp30 ligation also mediates recognition and killing of microbial targets including Plasmodium-infected erythrocytes, Cryptococcus/Candida, and filovirus-infected DCs [PMID:17436233, PMID:24139398, PMID:17381429]. NKp30 function is suppressed at multiple levels: TGF-β1 transcriptionally downregulates surface receptor [PMID:12646700], viral evasion proteins HCMV pp65 and poxviral hemagglutinin block activation—pp65 by dissociating CD3ζ [PMID:15821739, PMID:21901096]—and tumor-derived soluble galectin-3 and shed B7-H6 antagonize signaling [PMID:25315772, PMID:24780758]. B7-H6 ligand availability is itself controlled by c-Myc/N-Myc-driven transcription, HDAC-dependent histone acetylation at its promoter, and ADAM10/17 ectodomain shedding [PMID:27622013, PMID:23801635, PMID:24780758]. Alternative splicing into immunostimulatory (NKp30a/b) versus immunosuppressive (NKp30c) isoforms differentially polarizes NK effector functions and correlates with neuroblastoma outcome [PMID:25877893]. A functional NCR3 promoter polymorphism is associated with protection from primary Sjögren's syndrome, in which B7-H6 is expressed on salivary gland epithelium [PMID:23884468].","teleology":[{"year":1999,"claim":"Established the existence and identity of NKp30 as a dedicated NK-restricted activating receptor, defining the molecular entity whose ligands and signaling would later be dissected.","evidence":"mAb generation, cDNA cloning, CD3ζ co-immunoprecipitation, and redirected killing/masking assays in human NK cells","pmids":["10562324"],"confidence":"High","gaps":["No ligand identified at this stage","Downstream signaling pathway undefined"]},{"year":2001,"claim":"Defined the proximal signaling requirement, placing PI3K/Akt downstream of NKp30 engagement and linking it to lysis of antigen-presenting cells.","evidence":"Pharmacological PI3K inhibition and Akt phosphorylation Western blots in NK/APC co-cultures","pmids":["11385609"],"confidence":"High","gaps":["Did not connect PI3K to a specific transcriptional or cytoskeletal output","Ligand on APCs unidentified"]},{"year":2002,"claim":"Identified NKp30 as the dominant trigger for NK editing of dendritic cells, establishing a physiological role in immune regulation beyond tumor killing.","evidence":"NK/DC co-culture cytotoxicity with receptor-specific mAb blocking and HLA masking","pmids":["11828009"],"confidence":"High","gaps":["DC ligand for NKp30 not identified","Mechanism distinguishing immature vs mature DC susceptibility incomplete"]},{"year":2003,"claim":"Showed that NKp30 surface expression is transcriptionally tunable, identifying TGF-β1 as a suppressive regulator that abrogates DC killing.","evidence":"Flow cytometry, transcriptional analysis, and cytotoxicity assays with TGF-β1 treatment","pmids":["12646700"],"confidence":"High","gaps":["Transcription factors mediating TGF-β1 effect not mapped","Differential tumor-line susceptibility unexplained"]},{"year":2005,"claim":"Distinguished NKp30's cytokine-producing function from its cytolytic function and showed it drives DC maturation via TNF-α/IFN-γ independent of killing.","evidence":"Cytokine neutralization, supernatant transfer, and perforin-deficient NK cell analysis","pmids":["15784725"],"confidence":"High","gaps":["Signaling branch controlling cytokine vs cytotoxic output not resolved"]},{"year":2005,"claim":"Revealed a viral immune evasion mechanism, showing HCMV pp65 binds NKp30 and inhibits it by dissociating the CD3ζ signaling chain.","evidence":"Direct binding, co-IP, CD3ζ dissociation Western blots, and cytotoxicity assays","pmids":["15821739"],"confidence":"High","gaps":["Structural basis of pp65/NKp30 interaction not determined"]},{"year":2007,"claim":"Identified BAT3/BAG-6 as a soluble tumor-derived activating ligand of NKp30 with in vivo relevance to tumor rejection.","evidence":"Pulldown with NKp30-Fc, binding assays, knockdown, and multiple myeloma in vivo model","pmids":["18055229"],"confidence":"High","gaps":["Binding interface on NKp30 not yet mapped (resolved later in #23)","Relative contribution vs membrane ligands unclear"]},{"year":2007,"claim":"Mapped effector divergence among activating receptors, showing NKp30 cytotoxicity is RAB27A-dependent and Vav1-independent, unlike CD16.","evidence":"Griscelli syndrome type 2 patient NK cells and Vav1 phosphorylation analysis","pmids":["17255357"],"confidence":"High","gaps":["Full proximal signaling adaptors between CD3ζ and RAB27A not enumerated"]},{"year":2007,"claim":"Established the canonical NF-κB arm of NKp30 signaling and placed Syk upstream of it.","evidence":"IκB degradation, EMSA, κB-GFP reporter, and Syk inhibition in NK cell lines","pmids":["18025182"],"confidence":"High","gaps":["Link between NF-κB activation and specific effector genes not detailed"]},{"year":2007,"claim":"Extended NKp30 ligand recognition to microbial targets including Plasmodium-infected erythrocytes and filovirus-infected DCs.","evidence":"NKp30-Ig binding, DBL-1α peptide competition, siRNA knockdown, and perforin/granzyme assays","pmids":["17436233","17381429"],"confidence":"Medium","gaps":["Single-lab findings with limited follow-up","Direct structural confirmation of DBL-1α/NKp30 binding lacking"]},{"year":2007,"claim":"Introduced and contested a heparan-sulfate ligand model, with glycosylation of NKp30 itself shown to gate HS binding.","evidence":"rNKp30-Fc binding to HS-modified cells, enzymatic HS removal, deglycosylation; opposing positive and negative results across labs","pmids":["15294952","15972650","18006589"],"confidence":"Medium","gaps":["Whether HS is a genuine cellular ligand remains internally contradictory in the literature","Physiological relevance of recombinant-protein glycoforms unclear"]},{"year":2009,"claim":"Identified B7-H6 as a tumor-selective activating cell-surface ligand for NKp30, providing the canonical activating ligand of the receptor.","evidence":"NKp30-Fc binding screen, co-IP, NK activation/cytotoxicity, and normal-vs-tumor expression analysis","pmids":["19528259"],"confidence":"High","gaps":["Structural mode of engagement not yet known","Regulation of B7-H6 expression undefined at this point"]},{"year":2009,"claim":"Identified a suppressive cellular context, with MDSCs from HCC patients inhibiting NK function through NKp30 in a contact-dependent manner.","evidence":"MDSC/NK co-culture with NKp30 blocking and functional readouts","pmids":["19551844"],"confidence":"Medium","gaps":["Molecular ligand/mechanism on MDSCs not identified","Single-lab correlative system"]},{"year":2011,"claim":"Defined the structural basis of NKp30/B7-H6 recognition, revealing a unique antibody-like engagement using both β-sheets and identifying the F strand/C strand/CD loop binding region.","evidence":"X-ray crystallography of the complex and apo NKp30, peptide epitope mapping, mutagenesis, and solution binding","pmids":["21422170","21444796"],"confidence":"High","gaps":["Did not address glycosylation- or oligomerization-dependent binding (later in #37)"]},{"year":2011,"claim":"Demonstrated a second viral evasion strategy, with poxviral hemagglutinin selectively blocking NKp30 (while stimulating NKp46).","evidence":"NCR-CD3ζ reporter cells, siRNA silencing of individual NCRs, and HA binding/cytotoxicity assays","pmids":["21901096"],"confidence":"High","gaps":["Structural interface of HA/NKp30 not determined"]},{"year":2012,"claim":"Connected NKp30 signaling to the immune synapse and Erk1/2, and expanded its microbial recognition to fungal pathogens via PI3K-dependent killing.","evidence":"Confocal synapse imaging, Erk1/2 Western blots, unbiased fungal receptor screen, conjugate/perforin assays, IL-12 restoration","pmids":["22101078","24139398"],"confidence":"High","gaps":["Direct fungal NKp30 ligand not molecularly defined","Synapse co-accumulation mechanism with LFA-1 unresolved"]},{"year":2012,"claim":"Defined NKp30's role on non-NK lymphocytes, showing engagement on Vδ1 γδ T cells drives CC-chemokine secretion that suppresses CCR5-tropic HIV-1.","evidence":"mAb engagement of Vδ1 T cells, gain/loss-of-function, chemokine ELISA, and HIV-1 replication assays","pmids":["22403253"],"confidence":"High","gaps":["Whether the same receptor splicing/signaling applies in γδ T cells as in NK cells not addressed"]},{"year":2013,"claim":"Defined the minimal BAG-6 module sufficient for high-affinity NKp30 binding and inhibition, refining the structural basis of soluble-ligand antagonism.","evidence":"Domain truncation/fusion mapping, KD measurement, and NK functional assays","pmids":["24133212"],"confidence":"High","gaps":["How membrane-bound vs soluble BAG-6 switches between activating and inhibitory outcomes not fully resolved"]},{"year":2013,"claim":"Established that B7-H6 ligand availability is dynamically regulated, by proinflammatory induction on myeloid cells and by HDAC-dependent epigenetic control at its promoter.","evidence":"TLR/cytokine stimulation of monocytes/neutrophils, soluble/exosomal B7-H6 detection, HDACi and HDAC2/3 knockdown, and ChIP at the B7-H6 promoter","pmids":["23687088","23801635"],"confidence":"High","gaps":["Upstream signals coupling inflammation to B7-H6 transcription not fully mapped (Myc link added in #34)"]},{"year":2014,"claim":"Identified soluble galectin-3 as an inhibitory NKp30 ligand and ADAM10/17 shedding as a mechanism generating immunosuppressive soluble B7-H6.","evidence":"NKp30-Fc IP and SPR for galectin-3, knockdown/overexpression with xenografts; ADAM inhibition and siRNA with surface B7-H6 and NK activation readouts","pmids":["25315772","24780758"],"confidence":"High","gaps":["Whether galectin-3 and B7-H6 compete for overlapping NKp30 surfaces unresolved"]},{"year":2015,"claim":"Established isoform-level control of NKp30 output, with NKp30a/b/c splice variants differentially polarizing NK function and predicting neuroblastoma outcome.","evidence":"RT-PCR isoform quantification, isoform-specific functional assays, and clinical correlation in three patient cohorts","pmids":["25877893"],"confidence":"High","gaps":["Molecular signaling differences between isoform cytoplasmic tails not biochemically resolved"]},{"year":2015,"claim":"Linked NCR3 to human disease genetics and extended its activity to ILC2s, where B7-H6 engagement drives type 2 cytokines.","evidence":"NCR3 promoter polymorphism reporter assays and pSS association; ILC2 NKp30/B7-H6 stimulation with blocking and galectin-3 inhibition","pmids":["23884468","26582946"],"confidence":"High","gaps":["Causal mechanism linking reduced NCR3 transcription to pSS protection not fully defined","ILC2 signaling pathway downstream of NKp30 not dissected"]},{"year":2015,"claim":"Documented chronic ligand-driven receptor downregulation as a tumor immune-escape mechanism, with B7-H6 on ovarian carcinoma suppressing tumor-associated NK function.","evidence":"Phenotyping of tumor-associated NK cells from peritoneal fluid and functional assays against B7-H6+ targets","pmids":["26137398"],"confidence":"Medium","gaps":["Correlative patient data without direct causal manipulation","Mechanism of NKp30 downregulation not molecularly defined here"]},{"year":2016,"claim":"Identified c-Myc/N-Myc as direct transcriptional drivers of the NKp30 ligand B7-H6, connecting oncogenic transcription to NK immune recognition.","evidence":"B7-H6 promoter luciferase reporters, Myc ChIP, Myc inhibition/knockdown, and NK degranulation assays across tumor types","pmids":["27622013"],"confidence":"High","gaps":["Interplay between Myc and HDAC control of B7-H6 not integrated"]},{"year":2017,"claim":"Extended NKp30/B7-H6 signaling to a leukemia microenvironment, where ILC2 activation feeds an immunosuppressive MDSC circuit.","evidence":"NKp30 blocking in APL patient samples, IL-13 secretion assays, and in vivo survival analysis","pmids":["28928446"],"confidence":"Medium","gaps":["Single-lab pathway; relative contributions of NKp30 vs CRTH2 not separated","Direct causality of IL-13/MDSC axis incompletely established"]},{"year":2019,"claim":"Linked tumor B7-H6 exposure to a shift toward inhibitory NCR3 splice variants and receptor downmodulation in HCC NK cells.","evidence":"NK phenotyping, NCR3 isoform qPCR, NK/HCC co-culture, and B7-H6 siRNA knockdown","pmids":["30153337"],"confidence":"Medium","gaps":["Mechanism coupling ligand exposure to splicing changes unknown","Single-lab study"]},{"year":2020,"claim":"Revealed that NKp30 oligomerization and ligand affinity are glycosylation-dependent, providing a structural switch for receptor function.","evidence":"Size-exclusion chromatography, enzymatic deglycosylation, and crystallography of glycosylated NKp30/B7-H6","pmids":["32708305"],"confidence":"High","gaps":["Whether glycosylation-driven oligomerization operates on the NK cell surface in vivo not shown"]},{"year":2024,"claim":"Showed that IL-2 selectively maintains NKp30 expression and that immunostimulatory isoform overexpression can rescue cytokine-deprived NK dysfunction.","evidence":"IL-2 deprivation, NK92/NK92MI comparison, isoform overexpression, and in vivo xenograft clearance","pmids":["38698855"],"confidence":"Medium","gaps":["Mechanism by which IL-2 maintains NKp30 not defined","Single-lab study"]},{"year":null,"claim":"How signaling, splice isoform composition, glycosylation-dependent oligomerization, and competing activating/inhibitory ligands are integrated to set the threshold of NKp30 activation on a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking isoform tail to downstream PI3K/Syk/Erk branching","Whether HS is a bona fide cellular ligand unresolved across conflicting studies","Surface-relevance of glycan-driven oligomerization untested in primary NK cells"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,9,12]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[8,9,26]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5,19]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,20]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,2,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,15,20]}],"complexes":["NKp30–CD3ζ receptor complex"],"partners":["CD247","B7-H6","BAG6","LGALS3","PP65","ITGAL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14931","full_name":"Natural cytotoxicity triggering receptor 3","aliases":["Activating natural killer receptor p30","Natural killer cell p30-related protein","NK-p30","NKp30"],"length_aa":201,"mass_kda":21.6,"function":"Cell membrane receptor of natural killer/NK cells that is activated by binding of extracellular ligands including BAG6 and NCR3LG1. Stimulates NK cells cytotoxicity toward neighboring cells producing these ligands. It controls, for instance, NK cells cytotoxicity against tumor cells. Engagement of NCR3 by BAG6 also promotes myeloid dendritic cells (DC) maturation, both through killing DCs that did not acquire a mature phenotype, and inducing the release by NK cells of TNFA and IFNG which promote DC maturation","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/O14931/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NCR3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NCR3","total_profiled":1310},"omim":[{"mim_id":"613714","title":"NATURAL KILLER CELL CYTOTOXICITY RECEPTOR 3 LIGAND 1; NCR3LG1","url":"https://www.omim.org/entry/613714"},{"mim_id":"611550","title":"NATURAL CYTOTOXICITY TRIGGERING RECEPTOR 3; NCR3","url":"https://www.omim.org/entry/611550"},{"mim_id":"609148","title":"MALARIA, MILD, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/609148"},{"mim_id":"606764","title":"GASTROINTESTINAL STROMAL TUMOR; GIST","url":"https://www.omim.org/entry/606764"},{"mim_id":"606446","title":"SLAM FAMILY, MEMBER 6; SLAMF6","url":"https://www.omim.org/entry/606446"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":3.8},{"tissue":"intestine","ntpm":5.2},{"tissue":"lymphoid tissue","ntpm":15.5}],"url":"https://www.proteinatlas.org/search/NCR3"},"hgnc":{"alias_symbol":["1C7","NKp30","CD337"],"prev_symbol":["LY117"]},"alphafold":{"accession":"O14931","domains":[{"cath_id":"2.60.40.10","chopping":"22-129","consensus_level":"high","plddt":95.5576,"start":22,"end":129}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14931","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14931-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14931-F1-predicted_aligned_error_v6.png","plddt_mean":83.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NCR3","jax_strain_url":"https://www.jax.org/strain/search?query=NCR3"},"sequence":{"accession":"O14931","fasta_url":"https://rest.uniprot.org/uniprotkb/O14931.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14931/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14931"}},"corpus_meta":[{"pmid":"11828009","id":"PMC_11828009","title":"Human dendritic cells 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cells, belonging to the immunoglobulin superfamily with a single V-type domain and a charged transmembrane residue. NKp30 associates with CD3ζ chains that become tyrosine phosphorylated upon activation. NKp30 was identified as the product of the previously known 1C7 gene. mAb-mediated cross-linking induces strong NK activation; masking inhibits cytotoxicity against tumor and normal targets.\",\n      \"method\": \"Monoclonal antibody generation, molecular cloning of cDNA, co-immunoprecipitation with CD3ζ, redirected killing assays, masking assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — original identification with multiple orthogonal methods (cloning, biochemical association, functional assays), foundational paper replicated by many subsequent studies\",\n      \"pmids\": [\"10562324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NK cell-mediated lysis of autologous antigen-presenting cells is triggered by engagement of NKp30 and NKp46, and is dependent on phosphatidylinositol 3-kinase (PI-3K) signaling; PI-3K inhibitors LY294002 and wortmannin blocked both APC lysis and NKp30-triggered activation, and also reduced Akt/PKB phosphorylation downstream of NKp30 engagement.\",\n      \"method\": \"NK cell/APC co-culture cytotoxicity assays, mAb masking, pharmacological PI-3K inhibition, redirected killing assay, Western blot for Akt/PKB phosphorylation\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (functional killing, pharmacological inhibition, signaling readout), replicated by subsequent studies\",\n      \"pmids\": [\"11385609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NK cells recognize immature dendritic cells (iDCs) and kill them primarily via the NKp30 receptor; the NKp30 activating signal (not NKp46 or NKp44) is the major trigger for this NK-mediated DC killing. Mature DCs are protected from lysis unless MHC class I inhibitory signaling is blocked.\",\n      \"method\": \"NK/DC co-culture cytotoxicity assays, mAb-mediated receptor blocking, antibody-mediated HLA-A,B,C masking\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific mAb blocking of individual receptors with functional readout, replicated in multiple subsequent studies\",\n      \"pmids\": [\"11828009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TGF-β1 down-regulates NKp30 surface expression at the transcriptional level, which in turn profoundly inhibits NK-mediated killing of dendritic cells. NKp30 down-regulation by TGF-β1 does not equally affect killing of all tumor lines, reflecting differential receptor usage.\",\n      \"method\": \"Flow cytometry for surface receptor expression, transcriptional analysis (gene regulation), NK cytotoxicity assays with TGF-β1 treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transcriptional regulation demonstrated alongside functional cytotoxicity assays, replicated in subsequent TGF-β studies\",\n      \"pmids\": [\"12646700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NK cell-mediated induction of DC maturation is dependent on NKp30 engagement: NKp30 ligation causes NK cells to produce TNF-α and IFN-γ, which in turn promote DC maturation. Masking NKp30 with mAbs strongly reduces DC maturation. Analysis of perforin-deficient NK cells showed that NKp30 can drive cytokine-dependent DC maturation independently of direct killing.\",\n      \"method\": \"NK/DC co-culture with mAb blocking of NKp30, cytokine neutralization with anti-TNF-α antibodies, supernatant transfer assays, analysis of perforin-deficient NK cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches including neutralization, supernatant transfer, and genetic (perforin-deficient) dissection of function\",\n      \"pmids\": [\"15784725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The HCMV tegument protein pp65 directly binds NKp30 and inhibits NK cell cytotoxicity by causing dissociation of the associated CD3ζ signaling chain from NKp30, thereby reducing killing activity.\",\n      \"method\": \"Direct binding assays, co-immunoprecipitation of pp65 with NKp30, Western blot for CD3ζ dissociation, NK cytotoxicity assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding established with multiple biochemical methods, mechanistic dissection of CD3ζ dissociation, published in high-impact journal\",\n      \"pmids\": [\"15821739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Membrane-associated heparan sulfate proteoglycans (HSPGs) on target cell surfaces are recognized by NKp30 (and NKp46); 6-O-sulfation and N-acetylation state of the glucosamine building unit affect this recognition. Tumor cells with reduced cell-surface heparan sulfate (via heparanase expression, CHO mutants, or glypican-1 knockdown) show reduced recognition and lysis by NK cells.\",\n      \"method\": \"Binding assays with recombinant NKp30-Fc fusion, NK cytotoxicity assays with heparan sulfate-deficient cell lines and enzymatic removal of HS, siRNA knockdown of glypican-1\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell-based systems with functional readouts, but contested by a subsequent study (Warren et al., PMID 15972650) showing HS is not required\",\n      \"pmids\": [\"15294952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A study using complete enzymatic removal of heparan sulfate (HS) from multiple cell lines demonstrated that HS glycosaminoglycans are NOT ligands for NKp30, as removal of HS did not affect rNKp30-Fc binding or NKp30-dependent NK killing of target cells. This result contradicts the HSPG-ligand model.\",\n      \"method\": \"Mammalian heparanase treatment to remove HS from cell surfaces, rNKp30-Fc binding assays, NK cytotoxicity assays with HS-deficient vs. HS-expressing cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rigorous enzymatic removal approach with multiple cell types; negative result that directly challenges the HSPG ligand claim\",\n      \"pmids\": [\"15972650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The nuclear protein BAT3/BAG-6 is released from tumor cells as a soluble factor, directly binds NKp30, and engages NKp30 on NK cells to trigger NKp30-mediated cytotoxicity. BAT3 was necessary for tumor rejection in a multiple myeloma model.\",\n      \"method\": \"Pulldown/co-immunoprecipitation of BAT3 with NKp30-Fc fusion protein, direct binding assays, NK cytotoxicity assays with BAT3 blocking/knockdown, in vivo multiple myeloma model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding established by pulldown and confirmed functionally both in vitro and in vivo, published in high-impact journal\",\n      \"pmids\": [\"18055229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"B7-H6, a new member of the B7 family encoded by a previously unannotated gene, is a tumor cell surface ligand for NKp30 that triggers NKp30-mediated NK cell activation and cytotoxicity. B7-H6 is expressed on tumor cells but not detected in normal human tissues.\",\n      \"method\": \"Recombinant NKp30-Fc binding screen, co-immunoprecipitation, NK cell activation and cytotoxicity assays, expression analysis of normal vs. tumor tissues\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — original identification of B7-H6 as NKp30 ligand with direct binding and functional validation, extensively replicated\",\n      \"pmids\": [\"19528259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MDSCs from HCC patients inhibit autologous NK cell cytotoxicity and cytokine secretion in a cell-contact-dependent manner primarily through the NKp30 receptor on NK cells (not via arginase activity).\",\n      \"method\": \"In vitro co-culture of MDSCs and NK cells, mAb blocking of NKp30, cytotoxicity and cytokine secretion assays\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-contact and receptor blocking experiments, single lab, functional readout\",\n      \"pmids\": [\"19551844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NKp30, NKp44, and NKp46 bind to different heparan sulfate/heparin sequences; NKp30 and NKp44 have approximately one order of magnitude higher affinity for synthetic HS/heparin than NKp46, and NCR binding to HS is relevant for binding to tumor cells and NK cell activation.\",\n      \"method\": \"Microarray with synthetic HS/heparin oligosaccharides, surface plasmon resonance binding assays\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biophysical binding assays with rigorous SPR, but single study and HS-ligand role for NKp30 is contested in the field\",\n      \"pmids\": [\"19196184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of NKp30 bound to its tumor ligand B7-H6 was determined. NKp30 is a member of the CD28 family (includes CTLA-4 and PD-1) but uniquely engages B7-H6 using both front and back β-sheets of its Ig-like domain, resulting in engagement via the side and face of the β-sandwich. B7-H6 contacts NKp30 through CDR-like loops of its V-like domain in an antibody-like interaction distinct from other B7 family complexes.\",\n      \"method\": \"X-ray crystallography of NKp30/B7-H6 complex\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of receptor-ligand complex with detailed structural comparison, replicated by independent structure study (PMID 21444796)\",\n      \"pmids\": [\"21422170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the extracellular domain of NKp30 was determined, revealing an I-type Ig-like fold structurally distinct from NKp44 and NKp46. Peptide epitope mapping of a blocking antibody identified a critical ligand-binding region involving the F strand, C strand, and CD loop. Solution binding studies showed the N-terminal domain of B7-H6 is sufficient for NKp30 recognition; mutations near the F strand affect B7-H6 binding.\",\n      \"method\": \"X-ray crystallography, peptide epitope mapping, solution binding assays, site-directed mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis and binding assays, independent replication of structure\",\n      \"pmids\": [\"21444796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The glycosylation state of recombinant NKp30 critically affects its ability to bind heparan sulfate; N-linked glycans on NKp30 can mask HS binding, and deglycosylation of improperly glycosylated recombinant NKp30 restores heparin/HS binding. Three N-glycosylation sites are present on NKp30, and differential glycosylation modulates ligand binding properties.\",\n      \"method\": \"Binding assays with six different recombinant NKp30 preparations, enzymatic deglycosylation (PNGase F treatment), direct heparin binding assays, NK cell activation assays\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple recombinant protein variants tested with enzymatic manipulation, single lab\",\n      \"pmids\": [\"18006589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NKp30 ligation induces rapid activation of the canonical NF-κB pathway (IκB degradation, nuclear translocation of p65/p50 heterodimer) in NK cells within 30 minutes. This response was blocked by proteasome inhibitor MG132 and Syk inhibitor piceatannol, placing Syk upstream of NF-κB in the NKp30 signaling cascade.\",\n      \"method\": \"Immunoblotting for IκB degradation, EMSA with supershift for NF-κB subunit identification, fluorescence microscopy in single NK cells, κB-GFP reporter assay in NK92 cells, pharmacological inhibitors\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (biochemical, reporter, pharmacological) in multiple NK cell systems\",\n      \"pmids\": [\"18025182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NKp30 is responsible for recognition and killing of Plasmodium falciparum-parasitized erythrocytes; NKp30-Ig fusion proteins and DBL-1α peptides block this interaction. The DBL-1α domain of PfEMP-1 on parasitized erythrocytes is a direct, specific ligand for NKp30, leading to perforin production and granzyme B release.\",\n      \"method\": \"NKp30-Ig fusion protein binding assays, DBL-1α peptide competition experiments, perforin and granzyme B measurement assays\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding and functional competition assays, single lab, limited follow-up\",\n      \"pmids\": [\"17436233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In filovirus-infected dendritic cells, NK cell lysis is mediated through NKp30, as demonstrated by gene expression knockdown studies that directly linked NK lysis of infected DCs to NKp30 upregulation; perforin and CD95L (FasL) mediate the killing.\",\n      \"method\": \"Gene expression knockdown (siRNA), NK/DC cytotoxicity assays with infected vs. uninfected DCs, cytokine production measurement\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown directly linking NKp30 to functional outcome, single lab\",\n      \"pmids\": [\"17381429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In uterine decidual NK cells (dNK), NKp30 (but not NKp46) engagement triggers production of IFN-γ, TNF-α, MIP-1α, MIP-1β, and GM-CSF, whereas NKp46 (but not NKp30) engagement induces calcium mobilization, perforin polarization, granule exocytosis, and cytolytic activity. This demonstrates a differential, receptor-specific functional split in dNK cells.\",\n      \"method\": \"Flow cytometry for receptor expression, mAb-specific receptor engagement assays, calcium mobilization assays, granule exocytosis, cytokine measurement, cytotoxicity assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — comprehensive functional dissection using multiple orthogonal methods with receptor-specific mAbs in primary dNK cells\",\n      \"pmids\": [\"18713971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Poxviral hemagglutinin (HA) from vaccinia virus and ectromelia virus is a ligand for NKp30; HA present on VV-infected cells or as soluble protein blocks NKp30-triggered NK cell activation (while stimulating NKp46), representing an immune escape mechanism. Using NK cells with selectively silenced NKp30 expression (NCR-CD3ζ reporter cells), HA was shown to specifically block NKp30-mediated activation.\",\n      \"method\": \"NKp30 reporter cell assays (NCR-CD3ζ), siRNA silencing of individual NCRs, binding assays with recombinant HA, NK cytotoxicity assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reporter cell assay plus siRNA silencing plus multiple binding approaches, mechanistic detail on opposing effects on NKp30 vs. NKp46\",\n      \"pmids\": [\"21901096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NKp30-mediated signaling activates the Erk1/2 signaling pathway in NK cells upon contact with tumor target cells; NKp30 blockade decreases Erk1/2 phosphorylation, inhibits degranulation, cytotoxicity, and cytokine secretion but does not affect NK-target cell conjugation. NKp30 and LFA-1 co-accumulate at the NK immune synapse interface with tumor cells.\",\n      \"method\": \"Confocal microscopy for synapse formation, mAb blocking of NKp30, Western blot for Erk1/2 phosphorylation, degranulation and cytotoxicity assays\",\n      \"journal\": \"Immunological investigations\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (imaging, signaling, functional assays), single lab\",\n      \"pmids\": [\"22101078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NKp30 is responsible for recognition and killing of fungal pathogens Cryptococcus and Candida by NK cells; NKp30 was required for NK cell-fungal conjugate formation, PI3K signaling, and perforin release. IL-12 restored NKp30 expression and fungal killing in HIV-infected patients with diminished NKp30.\",\n      \"method\": \"Unbiased receptor identification screen, blocking antibodies, NK-fungal conjugate formation assays, PI3K signaling assays, perforin release assays, IL-12 restoration experiments\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased identification approach combined with multiple functional readouts, mechanistic dissection of signaling requirements\",\n      \"pmids\": [\"24139398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The stalk domain of NKp30 is an important module for ligand recognition and related signaling; mutational analysis of NKp30 showed differential binding affinities and signaling capacities for mono-, di-, or triglycosylated NKp30, suggesting that N-glycosylation degree provides a switch to modulate NKp30 ligand binding properties.\",\n      \"method\": \"NKp30-hIgG1-Fc fusion proteins with stalk region mutations, N-glycosylation site mutagenesis, binding assays, signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — mutagenesis with functional readouts, but single lab and confirmatory of structural data\",\n      \"pmids\": [\"22807449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A 250-amino acid C-terminal fragment of BAG-6 (BAG-6(686-936)) forms a noncovalent dimer and is sufficient for high-affinity NKp30 binding (KD <100 nM) and inhibition of NKp30-dependent NK cell signaling, IFN-γ release, and degranulation in the presence of tumor target cells.\",\n      \"method\": \"Domain mapping by truncation/fusion constructs, binding assays (KD measurement), NK cell functional assays (IFN-γ, degranulation), co-culture with tumor cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with defined domain, affinity measurement, and multiple functional readouts in single rigorous study\",\n      \"pmids\": [\"24133212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"B7-H6 is induced on non-transformed cells (proinflammatory CD14+CD16+ monocytes and neutrophils) upon TLR ligand stimulation or proinflammatory cytokines (IL-1β, TNF-α), producing both membrane-bound and soluble forms. In vivo, B7-H6 is expressed on monocytes during sepsis and soluble B7-H6 is associated with exosomal fractions in gram-negative sepsis.\",\n      \"method\": \"In vitro stimulation of monocytes/neutrophils with TLR ligands and cytokines, flow cytometry for surface expression, ELISA for soluble form, fractionation for exosomal association, in vivo patient serum analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell types and stimuli tested with both in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"23687088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"B7-H6 surface expression on tumor cells is downregulated by histone deacetylase inhibitors (pan- or class I HDACi) and by siRNA-mediated knockdown of HDAC2 or HDAC3, correlating with reduced histone acetylation at the B7-H6 promoter. This B7-H6 downregulation reduces NKp30-dependent NK effector functions.\",\n      \"method\": \"Pharmacological HDACi treatment, siRNA knockdown of HDAC isoforms, B7-H6 reporter assays, chromatin immunoprecipitation (ChIP) at B7-H6 promoter, NK cell functional assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (pharmacological, genetic, ChIP, functional) establishing epigenetic regulation of the NKp30 ligand\",\n      \"pmids\": [\"23801635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Soluble Galectin-3 released from tumor cells directly binds NKp30 (confirmed by NKp30-Fc immunoprecipitation and surface plasmon resonance), and this interaction specifically inhibits NKp30-mediated (but not NKG2D-mediated) NK cell cytolysis and CD107a expression. Galectin-3 knockdown in tumor cells increased NK lysis; Galectin-3 overexpression reduced lysis in vitro and in vivo.\",\n      \"method\": \"NKp30-Fc immunoprecipitation, surface plasmon resonance binding assay, NK cytotoxicity assays with recombinant Gal-3, shRNA knockdown and overexpression, xenograft mouse model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding confirmed by two independent methods plus in vitro and in vivo functional validation with genetic manipulation\",\n      \"pmids\": [\"25315772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Tumor cells shed B7-H6 by ectodomain cleavage mediated by ADAM10 and ADAM17 metalloproteases; pharmacological inhibition or siRNA knockdown of ADAM10/17 increases cell-surface B7-H6 and enhances NKp30-mediated NK activation. Soluble B7-H6 is elevated in serum of melanoma patients.\",\n      \"method\": \"ADAM metalloprotease inhibitors, siRNA knockdown of ADAM10/ADAM17, flow cytometry for surface B7-H6, NK cell activation assays, patient serum ELISA\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacological and genetic (siRNA) approaches identifying specific sheddases with functional NK activation readout\",\n      \"pmids\": [\"24780758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NKp44 (but not NKp30) recognizes hemagglutinins of influenza virus and Sendai virus; NKp30 does not bind viral hemagglutinins. This establishes a specificity distinction among natural cytotoxicity receptors.\",\n      \"method\": \"Binding assays with HA-expressing cells, NK cell killing assays with HA-expressing targets, receptor-specific mAb blocking\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — negative result for NKp30 HA binding shown with multiple experimental approaches, replicated in subsequent studies\",\n      \"pmids\": [\"11536166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NKp30-mediated cytotoxicity is dependent on RAB27A (defective in Griscelli syndrome), whereas CD16-mediated killing is RAB27A independent. NKp30 engagement does not lead to Vav1 phosphorylation (unlike CD16), revealing a functional dichotomy in signaling pathways downstream of different NK activating receptors.\",\n      \"method\": \"Analysis of NK cells from a GS type 2 patient with RAB27A mutation, redirected killing assays, Western blotting for Vav1 phosphorylation after receptor-specific stimulation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — natural genetic experiment (GS patient) plus biochemical signaling analysis, mechanistically informative dichotomy\",\n      \"pmids\": [\"17255357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NKp30 engagement on Vδ1 γδ T cells triggers production of high levels of CCL3/MIP-1α, CCL4/MIP-1β, and CCL5/RANTES (but not CXCL12), and this NKp30-induced CC-chemokine secretion suppresses replication of a CCR5-tropic strain of HIV-1 in CD4+/CCR5+ cells.\",\n      \"method\": \"mAb-mediated NKp30 engagement on Vδ1 T cells, gain-of-function and loss-of-function experiments, ELISA for chemokine production, HIV-1 replication assay in PM1 cell lines\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain- and loss-of-function experiments linking NKp30 engagement to specific chemokine secretion and functional antiviral consequence\",\n      \"pmids\": [\"22403253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"B7-H6 expressed on ovarian carcinoma cells or present as soluble form induces chronic NKp30 downregulation on tumor-associated NK cells, impairing IFN-γ production and cytolytic function specifically against B7-H6-expressing targets.\",\n      \"method\": \"Phenotypic analysis of tumor-associated NK cells from peritoneal fluids, flow cytometry for NKp30 and B7-H6 expression, NK cell functional assays\",\n      \"journal\": \"Oncoimmunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — correlative patient data with functional assays in vitro, single lab, no direct manipulation to establish causality\",\n      \"pmids\": [\"26137398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NKp30 is expressed as three alternatively spliced isoforms (NKp30a, NKp30b, NKp30c) with different intracellular domains; these isoforms differentially polarize NK cell effector functions (immunostimulatory vs. immunosuppressive cytokine profiles). The balance of isoforms correlates with clinical outcomes in neuroblastoma patients.\",\n      \"method\": \"RT-PCR isoform quantification in patient NK cells, NK cell functional assays (cytokine profiles per isoform composition), clinical correlation in 196 patient cohort (3 independent cohorts)\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific functional characterization replicated in three independent patient cohorts with mechanistic underpinning\",\n      \"pmids\": [\"25877893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The NKp30 ligand B7-H6 is expressed on salivary gland epithelial cells in primary Sjögren's syndrome (pSS), and a promoter polymorphism (rs11575837, G>A) in NCR3/NKp30 is associated with reduced gene transcription/function and protection from pSS. Circulating NKp30 levels correlate with NKp30-dependent (not CD16-dependent) IFN-γ secretion.\",\n      \"method\": \"Case-control genetic association study, NKp30 promoter reporter assays (rs11575837 functional characterization), NK cell functional assays (receptor-specific stimulation), immunohistochemistry of salivary glands for B7-H6\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — promoter polymorphism functionally validated with reporter assays plus receptor-specific functional dissection in patients and tissue\",\n      \"pmids\": [\"23884468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The proto-oncogene c-Myc (and N-Myc) directly drives B7-H6 expression in tumor cells through a functional Myc-binding site in the B7-H6 promoter. Pharmacological inhibition or siRNA/shRNA knockdown of c-Myc or N-Myc significantly decreased B7-H6 expression, and Myc inhibition impaired NKp30-mediated degranulation of NK cells.\",\n      \"method\": \"Luciferase reporter assays with B7-H6 promoter, chromatin immunoprecipitation (ChIP) for Myc binding, pharmacological Myc inhibitors, siRNA/shRNA knockdown of c-Myc and N-Myc, NK cell degranulation assays\",\n      \"journal\": \"Oncoimmunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — promoter ChIP plus reporter assay plus genetic manipulation with functional NK readout across multiple tumor types\",\n      \"pmids\": [\"27622013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In acute promyelocytic leukemia, ILC2s express functional NKp30 and are activated via NKp30/B7-H6 interaction (along with CRTH2/PGD2). NKp30-activated ILC2s secrete IL-13 which activates monocytic MDSCs; blocking NKp30 partially restores ILC2 and MDSC levels and increases survival.\",\n      \"method\": \"Flow cytometry for ILC2 NKp30 expression, NKp30-blocking experiments in APL patient samples, IL-13 secretion assays, in vivo survival analysis after pathway blockade\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NKp30 blocking experiments with functional readouts, in vivo survival data, single lab\",\n      \"pmids\": [\"28928446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ILC2s express functional NKp30; engagement of NKp30 with its cognate ligand B7-H6 induces rapid production of type 2 cytokines by ILC2s, which can be blocked by NKp30-blocking antibody or the inhibitory ligand galectin-3. B7-H6 expression is upregulated in lesional skin of atopic dermatitis patients and by proinflammatory cytokines on keratinocytes.\",\n      \"method\": \"Flow cytometry for NKp30 on ILC2s, NKp30/B7-H6 stimulation assays, blocking antibody experiments, galectin-3 inhibition, ILC2 cytokine measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor-ligand functional validation on ILC2s with blocking controls, single lab\",\n      \"pmids\": [\"26582946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NKp30 oligomerization depends on its N-glycosylation: NKp30 forms oligomers when expressed with simple N-glycans (in HEK293S GnTI- cells) but is detected only as monomers after enzymatic deglycosylation. A crystal structure of glycosylated NKp30 in complex with B7-H6 reveals a new glycosylation-induced mode of NKp30 dimerization; the stalk region also affects oligomerization and ligand affinity.\",\n      \"method\": \"Size exclusion chromatography for oligomeric state, enzymatic deglycosylation, X-ray crystallography of glycosylated NKp30/B7-H6 complex, binding assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus biochemical validation of glycosylation-dependent oligomerization in a single rigorous study\",\n      \"pmids\": [\"32708305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IL-2 deprivation preferentially downregulates NKp30 (but not NKp46) expression on NK cells, impairing NKp30-dependent cytotoxicity against B7-H6-expressing leukemia cells. Ectopic overexpression of immunostimulatory NKp30 isoforms (NKp30a or NKp30b) overcomes this IL-2 deficiency-mediated dysfunction, and NKp30a overexpression improved tumor clearance in vivo without IL-2 supplementation.\",\n      \"method\": \"IL-2 deprivation experiments, NK92 and IL-2-producing NK92MI cell comparison, ectopic NKp30 isoform overexpression, in vitro cytotoxicity assays, in vivo xenograft THP-1 clearance model\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic overexpression plus in vivo model, mechanistic distinction between NKp30 and NKp46 regulation, single lab\",\n      \"pmids\": [\"38698855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In HCC patients, NKp30-positive NK cells show a reduced expression of NCR3 immunostimulatory splice variants and increased inhibitory variant expression, resulting in deficient NKp30-mediated function. Exposure of NK cells to B7-H6-expressing HCC cells downmodulates NKp30 expression, and siRNA knockdown of B7-H6 prevents this downmodulation.\",\n      \"method\": \"NK cell phenotyping by flow cytometry, NCR3 isoform qPCR, NK cell functional assays, in vitro NK/HCC cell co-culture, siRNA knockdown of B7-H6\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods including siRNA functional validation of ligand-induced receptor downregulation, single lab\",\n      \"pmids\": [\"30153337\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NKp30 (NCR3) is a V-type immunoglobulin superfamily activating receptor constitutively expressed on human NK cells (and inducible on some T cell and ILC subsets) that signals through associated CD3ζ via PI3K/Akt and Syk/NF-κB/Erk1/2 pathways to trigger cytotoxicity, cytokine secretion, and DC maturation (via TNF-α/IFN-γ); its major cellular ligands include B7-H6 (bound via the F/C strands and CD loop of NKp30's Ig domain in a structure determined by X-ray crystallography), BAG-6/BAT3, and Galectin-3, while viral immune evasion proteins (HCMV pp65, poxviral HA) and tumor-derived soluble ligands inhibit NKp30 by dissociating CD3ζ or blocking receptor engagement; expression and function are regulated at the transcriptional level by TGF-β1 (suppression), prolactin (induction), HDAC activity (epigenetic regulation of B7-H6 ligand via Myc), IL-2, and alternative splicing into immunostimulatory (NKp30a/b) versus immunosuppressive (NKp30c) isoforms that differentially polarize NK effector functions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NCR3 (NKp30) is a V-type immunoglobulin superfamily activating receptor selectively expressed on human NK cells that drives cytotoxicity, cytokine secretion, and dendritic-cell editing as a core natural cytotoxicity receptor [#0, #2]. The receptor lacks intrinsic signaling motifs and instead associates non-covalently with CD3\\u03b6 chains, which are tyrosine-phosphorylated upon ligation [#0]; downstream signaling proceeds through PI3K/Akt [#1], a Syk\\u2192NF-\\u03baB cascade [#15], and Erk1/2 [#20], and effector killing requires RAB27A-dependent granule exocytosis rather than the Vav1 route used by CD16 [#29]. Its principal activating tumor ligand is the B7-family protein B7-H6, which NKp30 engages through the F/C strands and CD loop of its Ig-like domain via an antibody-like interaction using both \\u03b2-sheets of the V-domain [#9, #12, #13]; the released nuclear protein BAG-6/BAT3 is a second activating ligand bound at high affinity by a defined C-terminal dimeric fragment [#8, #23]. NKp30 ligation also mediates recognition and killing of microbial targets including Plasmodium-infected erythrocytes, Cryptococcus/Candida, and filovirus-infected DCs [#16, #21, #17]. NKp30 function is suppressed at multiple levels: TGF-\\u03b21 transcriptionally downregulates surface receptor [#3], viral evasion proteins HCMV pp65 and poxviral hemagglutinin block activation\\u2014pp65 by dissociating CD3\\u03b6 [#5, #19]\\u2014and tumor-derived soluble galectin-3 and shed B7-H6 antagonize signaling [#26, #27]. B7-H6 ligand availability is itself controlled by c-Myc/N-Myc-driven transcription, HDAC-dependent histone acetylation at its promoter, and ADAM10/17 ectodomain shedding [#34, #25, #27]. Alternative splicing into immunostimulatory (NKp30a/b) versus immunosuppressive (NKp30c) isoforms differentially polarizes NK effector functions and correlates with neuroblastoma outcome [#32]. A functional NCR3 promoter polymorphism is associated with protection from primary Sj\\u00f6gren's syndrome, in which B7-H6 is expressed on salivary gland epithelium [#33].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established the existence and identity of NKp30 as a dedicated NK-restricted activating receptor, defining the molecular entity whose ligands and signaling would later be dissected.\",\n      \"evidence\": \"mAb generation, cDNA cloning, CD3\\u03b6 co-immunoprecipitation, and redirected killing/masking assays in human NK cells\",\n      \"pmids\": [\"10562324\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No ligand identified at this stage\", \"Downstream signaling pathway undefined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the proximal signaling requirement, placing PI3K/Akt downstream of NKp30 engagement and linking it to lysis of antigen-presenting cells.\",\n      \"evidence\": \"Pharmacological PI3K inhibition and Akt phosphorylation Western blots in NK/APC co-cultures\",\n      \"pmids\": [\"11385609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not connect PI3K to a specific transcriptional or cytoskeletal output\", \"Ligand on APCs unidentified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified NKp30 as the dominant trigger for NK editing of dendritic cells, establishing a physiological role in immune regulation beyond tumor killing.\",\n      \"evidence\": \"NK/DC co-culture cytotoxicity with receptor-specific mAb blocking and HLA masking\",\n      \"pmids\": [\"11828009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DC ligand for NKp30 not identified\", \"Mechanism distinguishing immature vs mature DC susceptibility incomplete\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed that NKp30 surface expression is transcriptionally tunable, identifying TGF-\\u03b21 as a suppressive regulator that abrogates DC killing.\",\n      \"evidence\": \"Flow cytometry, transcriptional analysis, and cytotoxicity assays with TGF-\\u03b21 treatment\",\n      \"pmids\": [\"12646700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcription factors mediating TGF-\\u03b21 effect not mapped\", \"Differential tumor-line susceptibility unexplained\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Distinguished NKp30's cytokine-producing function from its cytolytic function and showed it drives DC maturation via TNF-\\u03b1/IFN-\\u03b3 independent of killing.\",\n      \"evidence\": \"Cytokine neutralization, supernatant transfer, and perforin-deficient NK cell analysis\",\n      \"pmids\": [\"15784725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling branch controlling cytokine vs cytotoxic output not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed a viral immune evasion mechanism, showing HCMV pp65 binds NKp30 and inhibits it by dissociating the CD3\\u03b6 signaling chain.\",\n      \"evidence\": \"Direct binding, co-IP, CD3\\u03b6 dissociation Western blots, and cytotoxicity assays\",\n      \"pmids\": [\"15821739\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of pp65/NKp30 interaction not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified BAT3/BAG-6 as a soluble tumor-derived activating ligand of NKp30 with in vivo relevance to tumor rejection.\",\n      \"evidence\": \"Pulldown with NKp30-Fc, binding assays, knockdown, and multiple myeloma in vivo model\",\n      \"pmids\": [\"18055229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface on NKp30 not yet mapped (resolved later in #23)\", \"Relative contribution vs membrane ligands unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped effector divergence among activating receptors, showing NKp30 cytotoxicity is RAB27A-dependent and Vav1-independent, unlike CD16.\",\n      \"evidence\": \"Griscelli syndrome type 2 patient NK cells and Vav1 phosphorylation analysis\",\n      \"pmids\": [\"17255357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full proximal signaling adaptors between CD3\\u03b6 and RAB27A not enumerated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established the canonical NF-\\u03baB arm of NKp30 signaling and placed Syk upstream of it.\",\n      \"evidence\": \"I\\u03baB degradation, EMSA, \\u03baB-GFP reporter, and Syk inhibition in NK cell lines\",\n      \"pmids\": [\"18025182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between NF-\\u03baB activation and specific effector genes not detailed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended NKp30 ligand recognition to microbial targets including Plasmodium-infected erythrocytes and filovirus-infected DCs.\",\n      \"evidence\": \"NKp30-Ig binding, DBL-1\\u03b1 peptide competition, siRNA knockdown, and perforin/granzyme assays\",\n      \"pmids\": [\"17436233\", \"17381429\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings with limited follow-up\", \"Direct structural confirmation of DBL-1\\u03b1/NKp30 binding lacking\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Introduced and contested a heparan-sulfate ligand model, with glycosylation of NKp30 itself shown to gate HS binding.\",\n      \"evidence\": \"rNKp30-Fc binding to HS-modified cells, enzymatic HS removal, deglycosylation; opposing positive and negative results across labs\",\n      \"pmids\": [\"15294952\", \"15972650\", \"18006589\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HS is a genuine cellular ligand remains internally contradictory in the literature\", \"Physiological relevance of recombinant-protein glycoforms unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified B7-H6 as a tumor-selective activating cell-surface ligand for NKp30, providing the canonical activating ligand of the receptor.\",\n      \"evidence\": \"NKp30-Fc binding screen, co-IP, NK activation/cytotoxicity, and normal-vs-tumor expression analysis\",\n      \"pmids\": [\"19528259\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mode of engagement not yet known\", \"Regulation of B7-H6 expression undefined at this point\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified a suppressive cellular context, with MDSCs from HCC patients inhibiting NK function through NKp30 in a contact-dependent manner.\",\n      \"evidence\": \"MDSC/NK co-culture with NKp30 blocking and functional readouts\",\n      \"pmids\": [\"19551844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular ligand/mechanism on MDSCs not identified\", \"Single-lab correlative system\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the structural basis of NKp30/B7-H6 recognition, revealing a unique antibody-like engagement using both \\u03b2-sheets and identifying the F strand/C strand/CD loop binding region.\",\n      \"evidence\": \"X-ray crystallography of the complex and apo NKp30, peptide epitope mapping, mutagenesis, and solution binding\",\n      \"pmids\": [\"21422170\", \"21444796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address glycosylation- or oligomerization-dependent binding (later in #37)\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated a second viral evasion strategy, with poxviral hemagglutinin selectively blocking NKp30 (while stimulating NKp46).\",\n      \"evidence\": \"NCR-CD3\\u03b6 reporter cells, siRNA silencing of individual NCRs, and HA binding/cytotoxicity assays\",\n      \"pmids\": [\"21901096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural interface of HA/NKp30 not determined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected NKp30 signaling to the immune synapse and Erk1/2, and expanded its microbial recognition to fungal pathogens via PI3K-dependent killing.\",\n      \"evidence\": \"Confocal synapse imaging, Erk1/2 Western blots, unbiased fungal receptor screen, conjugate/perforin assays, IL-12 restoration\",\n      \"pmids\": [\"22101078\", \"24139398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct fungal NKp30 ligand not molecularly defined\", \"Synapse co-accumulation mechanism with LFA-1 unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined NKp30's role on non-NK lymphocytes, showing engagement on V\\u03b41 \\u03b3\\u03b4 T cells drives CC-chemokine secretion that suppresses CCR5-tropic HIV-1.\",\n      \"evidence\": \"mAb engagement of V\\u03b41 T cells, gain/loss-of-function, chemokine ELISA, and HIV-1 replication assays\",\n      \"pmids\": [\"22403253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same receptor splicing/signaling applies in \\u03b3\\u03b4 T cells as in NK cells not addressed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the minimal BAG-6 module sufficient for high-affinity NKp30 binding and inhibition, refining the structural basis of soluble-ligand antagonism.\",\n      \"evidence\": \"Domain truncation/fusion mapping, KD measurement, and NK functional assays\",\n      \"pmids\": [\"24133212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How membrane-bound vs soluble BAG-6 switches between activating and inhibitory outcomes not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that B7-H6 ligand availability is dynamically regulated, by proinflammatory induction on myeloid cells and by HDAC-dependent epigenetic control at its promoter.\",\n      \"evidence\": \"TLR/cytokine stimulation of monocytes/neutrophils, soluble/exosomal B7-H6 detection, HDACi and HDAC2/3 knockdown, and ChIP at the B7-H6 promoter\",\n      \"pmids\": [\"23687088\", \"23801635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals coupling inflammation to B7-H6 transcription not fully mapped (Myc link added in #34)\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified soluble galectin-3 as an inhibitory NKp30 ligand and ADAM10/17 shedding as a mechanism generating immunosuppressive soluble B7-H6.\",\n      \"evidence\": \"NKp30-Fc IP and SPR for galectin-3, knockdown/overexpression with xenografts; ADAM inhibition and siRNA with surface B7-H6 and NK activation readouts\",\n      \"pmids\": [\"25315772\", \"24780758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether galectin-3 and B7-H6 compete for overlapping NKp30 surfaces unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established isoform-level control of NKp30 output, with NKp30a/b/c splice variants differentially polarizing NK function and predicting neuroblastoma outcome.\",\n      \"evidence\": \"RT-PCR isoform quantification, isoform-specific functional assays, and clinical correlation in three patient cohorts\",\n      \"pmids\": [\"25877893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular signaling differences between isoform cytoplasmic tails not biochemically resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked NCR3 to human disease genetics and extended its activity to ILC2s, where B7-H6 engagement drives type 2 cytokines.\",\n      \"evidence\": \"NCR3 promoter polymorphism reporter assays and pSS association; ILC2 NKp30/B7-H6 stimulation with blocking and galectin-3 inhibition\",\n      \"pmids\": [\"23884468\", \"26582946\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal mechanism linking reduced NCR3 transcription to pSS protection not fully defined\", \"ILC2 signaling pathway downstream of NKp30 not dissected\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Documented chronic ligand-driven receptor downregulation as a tumor immune-escape mechanism, with B7-H6 on ovarian carcinoma suppressing tumor-associated NK function.\",\n      \"evidence\": \"Phenotyping of tumor-associated NK cells from peritoneal fluid and functional assays against B7-H6+ targets\",\n      \"pmids\": [\"26137398\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative patient data without direct causal manipulation\", \"Mechanism of NKp30 downregulation not molecularly defined here\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified c-Myc/N-Myc as direct transcriptional drivers of the NKp30 ligand B7-H6, connecting oncogenic transcription to NK immune recognition.\",\n      \"evidence\": \"B7-H6 promoter luciferase reporters, Myc ChIP, Myc inhibition/knockdown, and NK degranulation assays across tumor types\",\n      \"pmids\": [\"27622013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between Myc and HDAC control of B7-H6 not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended NKp30/B7-H6 signaling to a leukemia microenvironment, where ILC2 activation feeds an immunosuppressive MDSC circuit.\",\n      \"evidence\": \"NKp30 blocking in APL patient samples, IL-13 secretion assays, and in vivo survival analysis\",\n      \"pmids\": [\"28928446\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab pathway; relative contributions of NKp30 vs CRTH2 not separated\", \"Direct causality of IL-13/MDSC axis incompletely established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked tumor B7-H6 exposure to a shift toward inhibitory NCR3 splice variants and receptor downmodulation in HCC NK cells.\",\n      \"evidence\": \"NK phenotyping, NCR3 isoform qPCR, NK/HCC co-culture, and B7-H6 siRNA knockdown\",\n      \"pmids\": [\"30153337\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling ligand exposure to splicing changes unknown\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed that NKp30 oligomerization and ligand affinity are glycosylation-dependent, providing a structural switch for receptor function.\",\n      \"evidence\": \"Size-exclusion chromatography, enzymatic deglycosylation, and crystallography of glycosylated NKp30/B7-H6\",\n      \"pmids\": [\"32708305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether glycosylation-driven oligomerization operates on the NK cell surface in vivo not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed that IL-2 selectively maintains NKp30 expression and that immunostimulatory isoform overexpression can rescue cytokine-deprived NK dysfunction.\",\n      \"evidence\": \"IL-2 deprivation, NK92/NK92MI comparison, isoform overexpression, and in vivo xenograft clearance\",\n      \"pmids\": [\"38698855\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which IL-2 maintains NKp30 not defined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How signaling, splice isoform composition, glycosylation-dependent oligomerization, and competing activating/inhibitory ligands are integrated to set the threshold of NKp30 activation on a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking isoform tail to downstream PI3K/Syk/Erk branching\", \"Whether HS is a bona fide cellular ligand unresolved across conflicting studies\", \"Surface-relevance of glycan-driven oligomerization untested in primary NK cells\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 9, 12]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [8, 9, 26]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 2, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 15, 20]}\n    ],\n    \"complexes\": [\"NKp30\\u2013CD3\\u03b6 receptor complex\"],\n    \"partners\": [\"CD247\", \"B7-H6\", \"BAG6\", \"LGALS3\", \"pp65\", \"ITGAL\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"NCR3","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"fabrication","uniprot_band":"medium","rules_fired":"R7","issue":"R7: fabricated (no corpus paper): 22101078"},"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}