| 1992 |
CD48 is the ligand (counter-receptor) for mouse CD2; identified by generating a chimeric CD2-IgG fusion protein that bound to CD48 on T cell lines, confirmed by protein microsequencing of the affinity-purified antigen, reactivity with recombinant CD48, and inhibition of CD2–CD48 binding by soluble CD48. CD48 is a GPI-anchored glycoprotein (~45 kD) predominantly expressed on hematopoietic cells. |
Chimeric CD2-IgG fusion protein pulldown, protein microsequencing, mAb inhibition assays, soluble recombinant protein competition |
The Journal of experimental medicine |
High |
1383383
|
| 1993 |
Quantitative kinetic and affinity analysis of rat CD2–CD48 interaction by surface plasmon resonance (BIAcore) revealed a very low-affinity interaction (KD ~60–90 µM) driven by an extremely rapid off-rate (koff ≥ 6 s⁻¹), with a normal on-rate (kon ≥ 10⁵ M⁻¹s⁻¹). Glycosylation of CD2 had little effect on binding affinity. |
Surface plasmon resonance (BIAcore) with soluble recombinant proteins in both binding orientations |
The EMBO journal |
High |
7903240
|
| 1995 |
The CD2-binding site on rat CD48 lies on the GFCC'C'' beta-sheet of its membrane-distal Ig domain (equivalent to the CD2 ligand-binding surface). Complementary charged-residue mutations in CD48 and CD2 demonstrated direct electrostatic contacts between the two binding surfaces, establishing a head-to-head docking topology. The modeled CD2–CD48 complex spans ~134 Å, similar to the predicted TCR–pMHC complex distance. |
Complementary site-directed mutagenesis of CD48 and CD2, functional binding assays, molecular modelling |
Current biology : CB |
High |
7697352
|
| 1996 |
NMR titration of ¹⁵N-labelled rat CD2 domain 1 with soluble CD48 identified the CD48-binding surface of CD2 as the GFCC'C'' face (~700–800 Ų), with no large-scale structural changes in CD2 upon CD48 binding. Species- and ligand-specific binding differences between rat and human CD2 are explained by as few as three residues (Thr37, Leu38, Glu41 in rat; Lys42, Lys43, Gln46 in human). |
Heteronuclear NMR (²D ¹⁵N-¹H HSQC) titration with soluble CD48 |
Biochemistry |
High |
8634239
|
| 1997 |
Analytical ultracentrifugation (sedimentation equilibrium and velocity) in free solution confirmed the weak affinity of the rat CD2–CD48 interaction (KD 20–110 µM at 5°C), ruling out significant self-association of either reactant as a confounding factor in SPR measurements. |
Analytical ultracentrifugation (sedimentation equilibrium and velocity) |
European biophysics journal : EBJ |
Medium |
9188168
|
| 1998 |
2B4 (CD244) is an additional ligand for CD48: recombinant mouse 2B4 extracellular domain bound to CD48-expressing cells and this binding was blocked by anti-CD48 mAbs. Surface plasmon resonance showed mCD48 binds m2B4 with 6–9-fold higher affinity (KD ~16 µM at 37°C) than it binds CD2; human CD48 bound human 2B4 with KD ~8 µM. |
Fluorescent bead binding assay with recombinant 2B4, anti-CD48 mAb blocking, surface plasmon resonance |
The Journal of experimental medicine |
High |
9841922
|
| 1998 |
CD48 fusion protein (CD48-IgG1) identified 2B4 as a novel counter-receptor of CD48 by immunofluorescence and immunoprecipitation, independently confirming the CD48–2B4 interaction. |
Chimeric CD48-IgG1 fusion protein pulldown, immunofluorescence, immunoprecipitation |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
9834056
|
| 1990 |
Mouse BCM1/CD48 (also known as OX45/Blast-1) is a GPI-anchored glycoprotein expressed on leukocytes, cloned and sequenced. Genomic linkage analysis placed the Bcm-1 locus on distal mouse chromosome 1, linked to an ATPase alpha chain gene, establishing CD48 as a member of the CD2/LFA3 Ig superfamily subgroup. |
cDNA cloning and sequencing, genetic linkage mapping, pulse-field gel electrophoresis |
The Journal of experimental medicine |
Medium |
1693656
|
| 1991 |
CD48 (Blast-1) is expressed on T cells and monocytes in addition to B cells. EBV transformation and PMA/IL-4/PHA stimulation increase surface CD48 expression by elevating steady-state CD48 mRNA. A subset of CD48 molecules is resistant to GPI-specific phospholipase C digestion and may exist in a complexed form on the cell surface. |
Immunoprecipitation, immunofluorescence, Northern blot, GPI-PLC digestion, Cos-7 transfection |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
1848579
|
| 1999 |
Engagement of 2B4 on human NK cells by anti-2B4 mAb or by CD48 (its ligand) triggers NK cell-mediated cytotoxicity. 2B4 is also expressed on monocytes and basophils, but 2B4 ligation does not activate T cells or monocytes, indicating cell-type-specific signaling downstream of the 2B4–CD48 interaction. |
Cytotoxicity assays using anti-2B4 mAb and recombinant CD48 protein, flow cytometry, molecular cloning of human 2B4 |
European journal of immunology |
Medium |
10359122
|
| 1999 |
CD48-deficient mice (generated by gene targeting) display a profound defect in CD4⁺ T cell activation: proliferative responses to mitogens, anti-CD3 mAb, and alloantigen are all reduced. CD48 is required on both T cells and antigen-presenting cells. The most dramatic impairment occurs when highly purified T cells are stimulated through the TCR plus PMA, suggesting CD48 plays a role in TCR signaling. |
Gene targeting (knockout mice), co-culture proliferation assays, mitogen and alloantigen stimulation assays |
Proceedings of the National Academy of Sciences of the United States of America |
High |
9927686
|
| 1999 |
NAIL (human 2B4 homologue, later NTB-A) binds CD48 as its counter-receptor. Recombinant CD48 protein enhances NK cell cytotoxicity and induces IFN-γ production. Soluble NAIL-Fc stimulates B cell proliferation and DC IL-12/TNF-α release, demonstrating that CD48–NAIL/2B4 interactions regulate multiple immune cell responses. |
Soluble fusion protein binding assays, NK cytotoxicity assays, IFN-γ ELISA, B cell proliferation, DC cytokine assays |
European journal of immunology |
Medium |
10556801
|
| 2000 |
CD48 co-clusters with IL-2Rα and HLA molecules in cholesterol-dependent lipid raft microdomains (~600–800 nm clusters) on T lymphoma cells. Disruption of membrane cholesterol with filipin or methyl-β-cyclodextrin disperses these clusters, whereas the transferrin receptor (non-raft) clusters are largely unaffected and do not co-localize with CD48. |
Immunogold staining/electron microscopy, confocal microscopy, cholesterol depletion, crosscorrelation analysis |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
10823948
|
| 2002 |
Direct force measurements using surface force apparatus confirmed that the full-length extracellular domains of CD2 and CD48 adhere in a head-to-head orientation, with no long-range electrostatic attraction, abrupt adhesive failure (no partial unfolding), and weak adhesion requiring lateral receptor mobility. This is the first direct measurement of forces governing CD2–CD48 heterotypic adhesion. |
Direct surface force measurements between protein-coated lipid bilayers |
Biochemistry |
Medium |
12356317
|
| 2003 |
CD48 on mast cells aggregates at sites of Mycobacterium tuberculosis binding, and anti-CD48 antibodies inhibit histamine release triggered by mycobacteria, implicating CD48 as a receptor mediating mast cell recognition of and activation by M. tuberculosis. |
Confocal microscopy of CD48 aggregation at bacterial binding sites, anti-CD48 mAb inhibition of histamine release |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
12759438
|
| 2005 |
Homotypic 2B4/CD48 interactions among NK cells are essential for IL-2-driven NK cell expansion, cytotoxicity, and IFN-γ secretion; CD2/CD48 interactions on NK cells are not required for these functions. 2B4-deficient but not CD2-deficient NK cells fail to clear syngeneic tumor cells in vivo. Defective 2B4/CD48 signaling correlates with impaired calcium signaling. GFP-tagged 2B4 localizes specifically to NK–NK conjugation sites, confirming homotypic trans-interaction. |
Gene-deficient NK cells (2B4⁻/⁻, CD48⁻/⁻), cytotoxicity assays, IFN-γ ELISA, calcium imaging, GFP-2B4 live-cell imaging, in vivo tumor clearance |
Blood |
High |
15905190
|
| 2005 |
Site-directed mutagenesis of human 2B4 identified Lys68 and Glu70 in the V domain as critical residues for CD48 binding and for 2B4-mediated functional activation of human NK cells; double Lys68Ala/Glu70Ala mutant abolishes CD48-Fc binding and NK activation. |
Site-directed mutagenesis, flow cytometry binding assay with CD48-Fc fusion protein, NK cell functional activation assay |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
16002700
|
| 2006 |
Crystal structure of the receptor-binding domain of rat CD48 resolved. The receptor-binding surface is unusually flat and electrostatically complementary to CD2. Thermodynamic analysis showed CD48–CD2 binding is driven by equivalent weak enthalpic and entropic contributions, distinct from the human CD2–CD58 interaction (which has a large entropic barrier). The flat, charge-complementary topology explains why CD48 can cross-react with both CD2 and 2B4/CD244. |
X-ray crystallography, isothermal titration calorimetry/thermodynamic binding analysis, comparative structural modelling |
The Journal of biological chemistry |
High |
16803907
|
| 2006 |
CD48 is an IL-3-inducible activating receptor on human eosinophils; cross-linking CD48 triggers release of eosinophil granule proteins (degranulation). In a murine asthma model, CD48 expression is induced by allergen challenge and partially regulated by IL-3; anti-IL-3 reduces both CD48 expression and airway inflammation. |
Flow cytometry, antibody cross-linking degranulation assays, murine OVA asthma model, anti-IL-3 antibody treatment |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
16785501
|
| 2006 |
CD48 controls both T cell and APC function in experimental colitis. CD48⁻/⁻ CD4⁺ T cells fail to induce colitis when transferred into CD48⁻/⁻ × Rag-2⁻/⁻ recipients (but can into Rag-2⁻/⁻ hosts), indicating CD48 is required on APCs in the recipient to drive disease. CD48⁻/⁻ macrophages produce less TNF-α and IL-12 upon LPS stimulation and show defective bacterial clearance. Anti-CD48 mAb treatment ameliorates colitis even after disease onset. |
Adoptive transfer colitis model using CD48⁻/⁻ and Rag-2⁻/⁻ mice, in vitro macrophage stimulation assays, anti-CD48 therapeutic treatment |
Gastroenterology |
High |
16472597
|
| 2009 |
GPI-anchored CD48 (but not CD59) is recruited to the immobilized TCR/CD3 complex upon T cell activation. CD48 reorganization is required for LAT association with the TCR/CD3 complex and for IL-2 production. CD2 acts upstream of CD48: CD2 associates with TCR/CD3 independently of CD48 and recruits Lck, while CD48 recruitment and subsequent LAT association depend on CD2. Thus CD2 and CD48 cooperate hierarchically to build the early TCR signalosome. |
Co-immunoprecipitation, proximity ligation/signalosome reconstitution assays, CD48 knockdown/knockout T cells, IL-2 ELISA, LAT co-precipitation |
Journal of immunology (Baltimore, Md. : 1950) |
High |
19494291
|
| 1997 |
Both type I (α/β) and type II (γ) interferons upregulate CD48 mRNA and surface protein expression on multiple human cell lines and peripheral blood CD3⁺, CD14⁺, and CD19⁺ subsets; IFN has no corresponding effect on LFA-3 expression. |
Northern blot, flow cytometry, IFN treatment of human cell lines and PBMCs |
Journal of interferon & cytokine research |
Medium |
9041467
|
| 2013 |
ORMDL3, an ER-localized protein, regulates IL-3-induced CD48 expression on eosinophils and mediates CD48-dependent eosinophil degranulation; ORMDL3 knockdown significantly inhibits eosinophil degranulation and in vivo recruitment. |
ORMDL3 overexpression and siRNA knockdown in eosinophils, flow cytometry, in vivo murine asthma model, degranulation assays |
Nature communications |
Medium |
24056518
|
| 2014 |
CD48 on human and murine eosinophils serves as a receptor mediating Staphylococcus aureus and its exotoxins (SEB, protein A, peptidoglycan) activation: SA/exotoxins physically bind to CD48, cause eosinophil degranulation, cytokine release, and signal transduction; these effects are significantly reduced by CD48 blocking or in CD48⁻/⁻ bone marrow eosinophils. In vivo, CD48⁻/⁻ mice show reduced eosinophil recruitment in SEB-induced peritonitis. |
Confocal microscopy of SA binding to CD48, adhesion and degranulation assays, cytokine ELISA, CD48⁻/⁻ mouse peritonitis model |
Clinical and experimental allergy |
High |
25255823
|
| 2014 |
Engagement of SLAMF2/CD48 on dendritic cells (DCs) by SLAMF4 recombinant protein or anti-SLAMF2 Ab activates immature DCs and prolongs survival of DNA-activated DCs by inhibiting IFN-β production and IFN-β-induced apoptosis, and by promoting production of the granzyme B inhibitor protease inhibitor-9. |
Anti-SLAMF2 mAb and recombinant SLAMF4 protein engagement of DCs, IFN-β ELISA, apoptosis assays, granzyme B inhibitor measurement |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
24670806
|
| 2016 |
2B4 on NK cells interacts with CD48 both in trans (on neighbouring cells) and in cis (on the same NK cell surface), using the same binding site. Cis interaction induces basal 2B4 phosphorylation but reduces trans-binding to CD48-positive target cells; interfering with cis interaction enhanced lysis of CD48-expressing tumour cells. |
Proximity ligation assay, FRET, anti-2B4 blocking to perturb cis interaction, cytotoxicity assays |
Open biology |
Medium |
27249817
|
| 2019 |
A cytomegalovirus-encoded soluble CD48 homologue (A43, encoded by owl monkey CMV) is secreted after proteolytic processing and binds human 2B4 with high affinity and slow dissociation rate (SPR). A43 abrogates host CD48:2B4 interactions, reduces NK–target conjugate formation and immunological synapse establishment, and impairs 2B4-mediated cytotoxicity and IFN-γ production by NK cells. |
Surface plasmon resonance, NK cell cytotoxicity assays, conjugate formation assays, immunological synapse imaging, IFN-γ ELISA |
PLoS pathogens |
High |
30947296
|
| 2020 |
CD48 expression in AML cells is epigenetically regulated by DNA methylation; treatment with a hypomethylating agent increases CD48 expression on AML cells and enhances NK cell killing of AML cells in vitro. Restoration of CD48 expression reverses AML immune evasion and activates NK cell function in vivo. |
Methylation analysis, hypomethylating agent treatment, NK cytotoxicity assays in vitro and in vivo mouse model |
Clinical science (London, England : 1979) |
Medium |
31922199
|
| 2020 |
Human innate lymphoid cell precursors (ILCPs) express CD48, and the interaction of 2B4 (on NKPs) with CD48 (on ILCPs) promotes differentiation of ILC2s; 2B4–CD48 signaling modulates ILC lineage commitment. |
Flow cytometry of precursor subsets, in vitro differentiation assays, in vivo humanized mouse model |
Science immunology |
Medium |
33219153
|
| 2021 |
GDF15 binds CD48 as a previously unrecognized receptor on T cells, thereby downregulating STUB1 (an E3 ubiquitin ligase that mediates FOXP3 degradation), which promotes generation of peripheral iTreg cells and enhances suppressive function of nTreg cells; GDF15 neutralizing antibody eradicates HCC in mouse models. |
Co-immunoprecipitation, mass spectrometry, RNA sequencing, ChIP, flow cytometry (CyTOF), GDF15-knockout HCC mouse model, hybridoma-generated neutralizing mAb |
Journal for immunotherapy of cancer |
Medium |
34489334
|
| 2022 |
Genome-wide CRISPR screens in ATLL cell lines identified CD48 as the top gene whose knockout confers resistance to NK-cell-mediated cytotoxicity; CD48-knockout ATLL cells evade NK-cell effector function (reduced IFN-γ induction and degranulation by primary human NK cells). Primary ATLL cells show reduced CD48 expression with disease progression. |
Genome-wide CRISPR knockout screen, flow cytometry, NK cytotoxicity assays with primary human NK cells |
Blood |
High |
35921533
|
| 2024 |
KDM6A loss leads to increased H3K27me3 on the CD48 promoter, causing CD48 downregulation in multiple myeloma cells. EZH2 inhibitor treatment restores CD48 (and CD38) expression and reverses resistance to Daratumumab-mediated ADCC, establishing KDM6A/EZH2/H3K27me3 as an epigenetic axis regulating CD48 expression. |
Genome-wide CRISPR screens, ChIP for H3K27me3 on CD48 promoter, EZH2 inhibitor treatment, CD38/CD48 re-expression, ADCC assays |
Nature communications |
High |
38355622
|