| 1995 |
A short segment near the amino terminus of PSGL-1 containing a tyrosine sulfation consensus is essential for P-selectin adhesion; mutation of N-terminal tyrosines to phenylalanine abolishes P-selectin binding, and sulfation inhibitors greatly reduce binding. |
Site-directed mutagenesis, sulfation inhibitor treatment, rolling adhesion assay on P-selectin-coated coverslips |
Cell |
High |
7585950
|
| 1997 |
CLA (cutaneous lymphocyte antigen), the skin-homing receptor on T cells, is an inducible carbohydrate modification (mediated by fucosyltransferase VII) of PSGL-1 that confers E-selectin binding; PSGL-1 without CLA binds P-selectin but not E-selectin, demonstrating independent regulation of selectin-binding phenotypes. |
Monoclonal antibody characterization, T cell differentiation assays, selectin-binding functional assays |
Nature |
High |
9353122
|
| 1998 |
Dimerization of PSGL-1 through a single conserved extracellular cysteine (C320) is essential for functional recognition of P-selectin; a C320A monomeric mutant fails to support rolling or P-selectin chimera binding. |
Site-directed mutagenesis, Western blotting under native/denaturing conditions, rolling adhesion assay under physiologic flow, P-selectin chimera binding |
The Journal of cell biology |
High |
9660879
|
| 1996 |
PSGL-1 serves as a ligand for L-selectin on neutrophils, mediating neutrophil aggregation; blocking PSGL-1 with Fab fragments of PL1 antibody reduces neutrophil aggregate number and size, consistent with L-selectin–PSGL-1 counter-receptor interaction. |
Flow cytometry aggregation assay, blocking antibody (Fab fragments) experiments |
Blood |
Medium |
8839831
|
| 1999 |
P-selectin binding to PSGL-1 triggers tyrosine kinase-dependent (Syk-like) signaling that activates CD11b/CD18 (beta2-integrin) on PMN; PSGL-1 engagement with a non-adhesion-blocking antibody was sufficient to trigger beta2-integrin-dependent aggregation and tyrosine phosphorylation. |
Mixed cell aggregation assays under shear, blocking antibodies, tyrosine kinase inhibitors (genistein), CHO-P transfectants, P-selectin-IgG fusion protein stimulation |
Blood |
High |
9920836
|
| 2000 |
PSGL-1 is expressed on platelets (at 25–100-fold lower levels than leukocytes) and mediates platelet rolling in mesenteric venules in vivo; anti-PSGL-1 antibody significantly reduced platelet rolling as shown by intravital microscopy. |
P-selectin-IgG affinity purification, immunoelectron microscopy, Western blotting, flow cytometry, intravital microscopy |
The Journal of experimental medicine |
High |
10770806
|
| 2000 |
The human granulocytic ehrlichiosis (HGE) bacterium infects neutrophils by specifically binding to fucosylated PSGL-1; blocking the P-selectin binding domain of PSGL-1 with monoclonal antibodies or enzymatic digestion prevents HGE cell binding and infection, and neoexpression of PSGL-1 with Fuc-TVII in non-susceptible cells confers susceptibility. |
Antibody blocking, enzymatic digestion, cDNA co-transfection of PSGL-1 + Fuc-TVII in non-susceptible cells |
Science |
High |
10834846
|
| 2002 |
PSGL-1 associates with Syk via the actin-linking ERM proteins moesin and ezrin, which directly interact with Syk in an ITAM-dependent manner; PSGL-1 engagement induces Syk tyrosine phosphorylation and SRE-dependent transcriptional activity, establishing PSGL-1 as a signaling receptor. |
Co-immunoprecipitation, Syk inhibitor (piceatannol), dominant-negative Syk and ITAM-mutated moesin overexpression, transcriptional activity reporter assay |
Immunity |
High |
12387735
|
| 2002 |
Attachment of the PSGL-1 cytoplasmic domain to the actin cytoskeleton via selective interaction with moesin (but not other ERM proteins) is essential for leukocyte rolling on P-selectin; truncation of the cytoplasmic domain abrogates rolling despite intact surface expression and P-selectin binding. |
Stable transfectants with truncated PSGL-1, rolling adhesion assays, actin cytoskeletal toxins, co-immunoprecipitation with ERM proteins |
Blood |
High |
12036880
|
| 2002 |
Core-2 O-glycans on Thr-57 of PSGL-1 and tyrosine sulfation at Tyr-51 (predominant for L-selectin; Tyr-48 predominant for P-selectin) are critical structural determinants for L-selectin binding and leukocyte rolling on PSGL-1. |
Site-directed mutagenesis of Thr/Tyr residues, soluble L-selectin binding, leukocyte rolling assays on transfected CHO cells, co-expression of glycosyltransferases |
The Journal of biological chemistry |
High |
12403782
|
| 2003 |
P-selectin interaction with PSGL-1 induces formation of procoagulant microparticles from human blood; PSGL-1-deficient mice produce fewer microparticles after P-selectin chimera infusion and fail to increase microparticle count with aging. |
P-selectin-Ig chimera infusion, PSGL-1 knockout mice, microparticle quantification, tail-bleeding time in hemophilia A mice |
Nature medicine |
High |
12858167
|
| 2004 |
Human FucT-IV and FucT-VII both contribute to PSGL-1 selectin-binding activity, with FucT-VII playing the predominant role; core-2 O-glycans on Thr-57 are critical for L- and P-selectin rolling but additional binding sites support >75% of E-selectin-mediated rolling. |
CHO cell transfection with FucT-IV and/or FucT-VII, rolling adhesion assays, Thr-57 mutagenesis |
The Journal of biological chemistry |
High |
15579466
|
| 2005 |
P-selectin expressed on thymic endothelium binds PSGL-1 on lymphoid progenitors to mediate thymic homing; PSGL-1-deficient mice have fewer early thymic progenitors and increased empty niches, and the number of resident thymic progenitors controls thymic P-selectin expression. |
Parabiosis, competitive thymus reconstitution, short-term homing assays, PSGL-1 knockout mice |
Nature immunology |
High |
15880112
|
| 2007 |
PSGL-1, ESL-1, and CD44 together constitute all E-selectin ligand activity on neutrophils: PSGL-1 dominates initial capture, ESL-1 is critical for converting tethers to slow rolling, and CD44 controls rolling velocity and mediates E-selectin-dependent redistribution of PSGL-1 and L-selectin to the uropod pole via p38 signaling. |
Gene knockout and RNA interference loss-of-function in mice and cells, intravital microscopy, flow chamber assays |
Immunity |
High |
17442598
|
| 2007 |
PSGL-1 mediates an enhanced chemotactic T cell response to homeostatic chemokines CCL21 and CCL19 (but not inflammatory chemokines), facilitating T cell homing to secondary lymphoid organs independently of selectin binding. |
PSGL-1-null mice, homing assays, T cell chemotaxis assays |
Nature immunology |
High |
17401367
|
| 2007 |
EphB4 activation upregulates PSGL-1 expression on endothelial progenitor cells (EPCs) and enhances EPC adhesion to E- and P-selectin; PSGL-1 siRNA reverses the proangiogenic and adhesive effects of EphB4 activation, placing PSGL-1 downstream of EphB4 in EPC angiogenic signaling. |
siRNA knockdown of EphB4 and PSGL-1, EPC adhesion assays, neutralizing antibodies, mouse hind limb ischemia model |
The Journal of clinical investigation |
Medium |
17510705
|
| 2007 |
PSGL-1 engagement in macrophages signals through Akt/mTOR to selectively upregulate translation of preformed ROCK-1 mRNA (not ROCK-2), enabling ROCK-1-dependent chemotaxis and phagocytosis; PSGL-1-deficient macrophages recapitulate effects of mTOR inhibition by rapamycin. |
PSGL-1 knockout mouse macrophages, rapamycin inhibition, polysome profiling, ROCK-1 protein detection, chemotaxis and phagocytosis assays |
The EMBO journal |
High |
17245434
|
| 2007 |
Crystal structure of the radixin FERM domain in complex with the PSGL-1 juxtamembrane peptide reveals that the peptide binds the FERM subdomain C groove via a β-strand interaction; PSGL-1 lacks the canonical Motif-1 but compensates with non-conserved large residues (Met9, His8) that stabilize groove binding. |
X-ray crystallography of radixin FERM domain–PSGL-1 peptide complex |
Genes to cells : devoted to molecular & cellular mechanisms |
High |
18076570
|
| 2008 |
E-selectin engagement of PSGL-1 signals through the Src family kinase Fgr and ITAM-containing adaptor proteins DAP12 and FcRγ to phosphorylate Syk, which is required for slow leukocyte rolling and neutrophil recruitment in vivo. |
Gene-deficient mice (fgr-/-, hck-/-lyn-/-fgr-/-, Tyrobp-/-Fcrg-/-), flow chamber assays, intravital microscopy, peritonitis model, Syk and p38 phosphorylation |
The Journal of experimental medicine |
High |
18794338
|
| 2008 |
The PSGL-1 cytoplasmic domain is dispensable for neutrophil rolling on P-selectin but is essential for activating beta2-integrins (LFA-1) via Syk to induce slow rolling on ICAM-1; DeltaCD mice (cytoplasmic domain-deleted) roll normally on P-selectin but fail to trigger Syk-dependent LFA-1 activation. |
DeltaCD knock-in mice, flow chamber assays, OSGE digestion to match PSGL-1 density, Syk phosphorylation assay, intravital microscopy |
Blood |
High |
18550846
|
| 2009 |
PSGL-1 interacts with homeostatic chemokines CCL19 and CCL21 to facilitate T-cell chemotaxis; O-glycan modifications that support selectin-mediated rolling interfere with PSGL-1 binding to these homeostatic chemokines, demonstrating that glycosylation reciprocally regulates inflammatory versus homeostatic trafficking functions. |
PSGL-1-null mice, chemotaxis assays, glycosyltransferase manipulation (review integrating primary data) |
Immunological reviews |
Medium |
19594630
|
| 2010 |
E-selectin engagement of PSGL-1 or CD44 triggers slow leukocyte rolling through a common lipid raft-dependent pathway using Src kinases Hck, Lyn, and Fgr, Syk, and Bruton tyrosine kinase (Btk) as intermediates; the PSGL-1 cytoplasmic domain is required to activate SFKs and slow rolling but PI3K is not required. |
KO mice (Hck/Lyn/Fgr), Btk-deficient mice, lipid raft disruption, flow chamber and intravital microscopy, phosphorylation assays |
Blood |
High |
20299514
|
| 2010 |
Tyrosine sulfation at the N-terminus of PSGL-1 (not O-glycosylation at T57) is critical for EV71 binding and infection of leukocytes; sodium chlorate (sulfation inhibitor) blocks PSGL-1–EV71 interaction and viral replication, while T57A mutation does not affect EV71 binding. |
PSGL-1 mutant expression in 293T cells, flow cytometry binding assay, sodium chlorate inhibition, viral replication assay in Jurkat cells |
PLoS pathogens |
High |
21079683
|
| 2011 |
Tyrosine sulfation of mouse Psgl-1 is required for optimal P-selectin binding and leukocyte rolling in vivo; hematopoietic reconstitution with Tpst1;Tpst2 double-KO cells (lacking tyrosylprotein sulfotransferase activity) shows reduced P-selectin binding and increased rolling velocity despite equivalent PSGL-1 surface expression. |
Bone marrow transplantation with TPST double-KO donors, intravital microscopy, in vitro rolling assay on P-selectin, flow cytometry |
PloS one |
High |
21633705
|
| 2012 |
The PSGL-1 ERM-binding sequence (EBS), specifically Arg-337 and Lys-338 in the cytoplasmic tail, is critical for leukocyte tethering and rolling on L-, P-, and E-selectin and for activating ERK; however, EBS is dispensable for Syk phosphorylation and E-selectin-induced slow rolling via LFA-1. |
Mutagenesis (EBS deletion, Arg/Lys alanine substitution), leukocyte rolling assays on selectin substrates, ERK and Syk phosphorylation assays |
The Journal of biological chemistry |
High |
22311979
|
| 2013 |
A subset of PSGL-1 molecules is constitutively associated with L-selectin on neutrophils; this PSGL-1–L-selectin signaling complex signals through Src family kinases and ITAM adaptor proteins to activate LFA-1, with signaling output dependent on the L-selectin cytoplasmic tail. |
Co-immunoprecipitation, flow chamber assays, KO mice (L-selectin), neutrophil slow rolling and recruitment by intravital microscopy |
The Journal of experimental medicine |
High |
24127491
|
| 2013 |
EV71 binds to the N-terminal region of PSGL-1 (sulfated tyrosines) via conserved lysine residues VP1-242 and VP1-244 on the capsid; VP1-145 acts as a molecular switch controlling PSGL-1 binding by modulating the orientation of VP1-244 lysine side chain. |
Site-directed mutagenesis (VP1-145, VP1-244, VP1-242), PSGL-1-expressing CHO cell binding assays, Jurkat T-cell infection, crystal structure comparison |
PLoS pathogens |
High |
23935488
|
| 2013 |
PSGL-1-mediated EV71 entry proceeds via caveolar (caveolin-1-dependent) endocytosis requiring intact membrane cholesterol and acidification; this is distinct from hSCARB2-mediated entry which uses clathrin-dependent endocytosis. |
siRNA knockdown of caveolin-1, specific endocytosis inhibitors, confocal colocalization, pH inhibitors, PSGL-1-expressing L929 cells and Jurkat T cells |
Journal of virology |
High |
23760234
|
| 2015 |
The N-termini of PSGL-1 and CCR7 have overlapping and competitive binding sites for CCL19, as determined by NMR chemical shift mapping; the solution structure of CCL19 reveals a canonical chemokine fold, and PSGL-1 competes with CCR7 for CCL19 binding. |
NMR solution structure of CCL19, chemical shift mapping, competitive binding assays |
Biochemistry |
High |
26115234
|
| 2016 |
PSGL-1 ligation on exhausted CD8+ T cells inhibits TCR and IL-2 signaling and upregulates PD-1, leading to diminished survival upon TCR stimulation; PSGL-1-deficient mice clear chronic virus due to increased survival and multifunctionality of effector T cells with downregulated PD-1. |
PSGL-1-deficient mice, chronic viral infection model (LCMV), T cell function assays, receptor expression analysis |
Immunity |
High |
27192578
|
| 2018 |
Cooperative PSGL-1 and CXCR2 signaling in rolling neutrophils promotes β2-integrin-dependent arrest and NETosis contributing to deep vein thrombosis; PSGL-1 signaling in DVT uses tyrosine 145 of SLP-76 rather than Y112/Y128, and does not require L-selectin in this context. |
Genetically engineered mice, ultrasonography, spinning-disk intravital microscopy, flow restriction DVT model, pharmacological blocking |
Blood |
High |
30068506
|
| 2019 |
VISTA binds PSGL-1 selectively at acidic pH (as found in tumor microenvironments) via multiple histidine residues along the rim of the VISTA extracellular domain; this interaction suppresses T cells and antibodies that selectively block this interaction at acidic pH reverse VISTA-mediated immune suppression in vivo. |
Binding assays, pH titration experiments, histidine mutagenesis, pH-selective blocking antibodies, in vivo tumor models |
Nature |
High |
31645726
|
| 2019 |
HIV-1 Vpu binds PSGL-1 and induces its ubiquitination and proteasomal degradation through the ubiquitin ligase SCFβ-TrCP2; PSGL-1 (induced by IFN-γ) inhibits HIV-1 reverse transcription and blocks virion infectivity by incorporating into progeny virions. |
Quantitative mass spectrometry proteomics, co-immunoprecipitation, ubiquitination assays, siRNA knockdown, viral infectivity assays in primary CD4+ T cells |
Nature microbiology |
High |
30833724
|
| 2020 |
PSGL-1 incorporated into HIV-1 virions blocks virus particle attachment to target cells through its extracellular N-terminal domain; this inhibitory activity is glycoprotein-independent, and Vpu (primarily) and Nef downregulate PSGL-1 from the cell surface to partially escape restriction. |
PSGL-1 domain mapping, pseudovirus attachment assays, virus infectivity assays, flow cytometry, siRNA knockdown |
Proceedings of the National Academy of Sciences of the United States of America |
High |
32273392
|
| 2020 |
PSGL-1 directly binds cellular F-actin to restrict actin dynamics, inhibiting HIV DNA synthesis; PSGL-1 also binds gp41 and sequesters it at the plasma membrane, blocking Env incorporation into nascent virions, causing loss of envelope spikes and profound defects in viral entry. |
F-actin binding assay, gp41 co-immunoprecipitation, cryo-electron microscopy, super-resolution imaging, HIV DNA synthesis assay, Env incorporation assay |
Cell discovery |
High |
32802403
|
| 2020 |
Virion-incorporated PSGL-1 (and CD43) inhibits HIV-1 cell-free infection and transinfection by preventing virus-cell attachment; PSGL-1's full-length ectodomain is required for this inhibitory effect, and coclustering with HIV-1 Gag at uropod membranes depends on polybasic sequences in both the PSGL-1 cytoplasmic tail and Gag matrix domain. |
Virion incorporation assays, CD4+ and CD4- cell attachment assays, ectodomain truncation mutants, Gag colocalization studies |
Proceedings of the National Academy of Sciences of the United States of America |
High |
32193343
|
| 2020 |
PSGL-1 impairs SARS-CoV and SARS-CoV-2 spike glycoprotein incorporation into pseudovirions and blocks pseudovirus attachment and infectivity of target cells. |
Pseudovirus infectivity assays, Western blotting for spike incorporation, cell attachment assays |
Viruses |
Medium |
33396594
|
| 2021 |
GALNT4-mediated O-glycosylation of PSGL-1 promotes P-selectin-induced monocyte adhesion and transmigration by activating the Akt/mTOR and IκBα/NFκB pathways; GALNT4 knockdown reduces PSGL-1 O-glycosylation, attenuates Akt/mTOR and NFκB activation, and decreases monocyte adhesion to P-selectin. |
VVL pull-down, PSGL-1 immunoprecipitation, GALNT4 shRNA knockdown, GALNT4 overexpression, monocyte flow adhesion assay, mTOR inhibitor (rapamycin), phosphorylation assays |
Journal of molecular and cellular cardiology |
Medium |
34974060
|
| 2023 |
PSGL-1 acts upstream of PD-1 and requires co-ligation with the TCR to attenuate early TCR signaling via Zap70 and maintain expression of the Zap70 inhibitor Sts-1, driving terminal CD8+ T cell exhaustion; PSGL-1 deficiency enables responses to low-affinity TCR ligands and sustains an elevated metabolic/glycolytic gene signature. |
PSGL-1-deficient mice, chronic infection/tumor models, TCR signaling assays (Zap70 phosphorylation), Sts-1 expression analysis, metabolic gene profiling |
Cell reports |
High |
37115668
|
| 2008 |
Sorting nexin SLIC-1 (SNX20) directly and specifically interacts with the PSGL-1 cytoplasmic domain and contains a Phox homology domain that targets the PSGL-1/SLIC-1 complex to endosomes, cycling PSGL-1 into the endosomal compartment. |
Yeast two-hybrid screen, co-immunoprecipitation, colocalization experiments, motif mapping, SNX20-deficient mice |
European journal of immunology |
Medium |
18196517
|
| 2004 |
Human PSGL-1 interacts with skin-associated chemokine CCL27 via sulfated tyrosines at its amino terminus (not glycans); PSGL-1 expression on CCR10-expressing cells reduces chemotaxis to CCL27, suggesting PSGL-1 regulates chemokine-mediated responses by sequestering CCL27. |
rPSGL-Ig binding assays, arylsulfatase and glycosidase treatments, sulfation inhibitor, tyrosine-to-phenylalanine mutagenesis, chemotaxis assays |
The Journal of biological chemistry |
High |
15466853
|
| 2023 |
P-selectin (CD62P) binding to PSGL-1 on tumor-associated macrophages activates the JNK/STAT1 pathway to induce C5 transcription and C5a release, shifting TAMs toward a pro-tumor phenotype and promoting CRC growth via the C5a/C5aR1 axis. |
Western blotting, siRNA knockdown of PSGL-1, JNK/STAT1 pathway inhibitors, dual-luciferase reporter, ChIP assay, in vivo AOM/DSS CRC model |
Theranostics |
Medium |
37064877
|
| 2005 |
PSGL-1 cross-linking in neutrophils triggers tyrosine-phosphorylation-dependent and c-Abl-involved alteration of F-actin cytoskeleton and PSGL-1 polarization; c-Abl redistributes to F-actin-concentrated regions upon PSGL-1 engagement. |
Anti-PSGL-1 antibody cross-linking, actin cytoskeleton staining, genistein (tyrosine kinase inhibitor), STI571 (c-Abl inhibitor), cytochalasin B treatment |
Journal of cellular biochemistry |
Medium |
15526280
|
| 2009 |
Flotillin-1 and flotillin-2 associate with PSGL-1 in resting and stimulated neutrophils (shown by co-immunoprecipitation and colocalization) and reorganize into uropod domains; flotillin cap formation is PSGL-1-independent as shown by PSGL-1-deficient neutrophils, but PSGL-1 and flotillins redistribute together more rapidly than other uropod proteins. |
Co-immunoprecipitation, immunofluorescence, PSGL-1-deficient mice neutrophils, HL-60 differentiated cells |
PloS one |
Medium |
19404397
|
| 2005 |
PSGL-1 engagement upregulates CSF-1 transcription in a Syk-dependent manner; overexpression of wild-type but not kinase-dead Syk promotes CSF-1 promoter activation downstream of PSGL-1, and Syk inhibitor piceatannol suppresses PSGL-1-induced CSF-1 mRNA upregulation. |
Antibody engagement of PSGL-1, CSF-1 promoter reporter assay, Syk dominant-negative overexpression, piceatannol inhibition, RT-PCR |
Cellular immunology |
Medium |
16289055
|