| 2002 |
TL1A (TNFSF15) is a ligand for DR3 (death domain-containing receptor) and decoy receptor TR6/DcR3. TL1A binding to DR3 induces NF-κB activation and apoptosis in DR3-expressing cell lines, and TR6-Fc protein antagonizes these signaling events. In T cells, TL1A acts as a costimulator that increases IL-2 responsiveness and secretion of proinflammatory cytokines. |
Ligand-receptor binding assays, NF-κB reporter assays, apoptosis assays, T cell costimulation assays in vitro and in vivo |
Immunity |
High |
11911831
|
| 2003 |
TL1A-DR3 interaction induces formation of a signaling complex containing TRADD, TRAF2, and RIP, and activates NF-κB and ERK, JNK, and p38 MAPK pathways. TL1A-induced NF-κB activation produces c-IAP2, which prevents DR3-mediated apoptosis in TF-1 cells. Inhibition of NF-κB or knockdown of c-IAP2 by RNA interference sensitizes cells to TL1A-induced apoptosis. |
Co-immunoprecipitation of signaling complex, NF-κB reporter assays, MAPK pathway inhibitors, RNA interference (siRNA knockdown of c-IAP2), apoptosis assays |
The Journal of biological chemistry |
High |
12882979
|
| 1999 |
TL1A (VEGI/TNFSF15) is expressed predominantly in endothelial cells, encodes a type II transmembrane protein, and the secreted (soluble) form directly inhibits endothelial cell proliferation and suppresses tumor vascularization in vivo. Local gene transfer of soluble VEGI caused complete suppression of murine colon cancer growth associated with marked reduction in vascularization. |
cDNA cloning from HUVEC library, gene transfer/tumor model (MC-38 murine colon cancer), in vitro endothelial cell proliferation assay, histological analysis of vascularization |
FASEB journal |
High |
9872942
|
| 1999 |
TL1A (TL1) induces apoptosis in endothelial cells via activation of stress-activated protein kinase (SAPK/JNK) and p38 MAPK pathways and caspase-3. TL1-induced apoptosis was reduced by dominant-interfering c-Jun mutant, p38 inhibitor SB203580, and caspase inhibitor ZVAD-fmk. The effect was not inhibited by soluble TNF receptors 1 or 2, indicating a distinct receptor. |
Endothelial cell apoptosis assays, kinase activity assays (SAPK, p38), dominant-negative mutant expression, pharmacological inhibitors, caspase substrate assays, immunocytochemistry |
The Journal of biological chemistry |
High |
9880523
|
| 1999 |
VEGI (TNFSF15) activates NF-κB (inducing IκBα degradation and p65 nuclear translocation) and c-Jun N-terminal kinase in myeloid cells, inhibits proliferation of multiple tumor cell lines, and activates caspase-3 leading to PARP cleavage. Its activity cannot be neutralized by anti-TNF antibodies and it does not compete with TNF binding, indicating it acts through a distinct receptor. |
EMSA (NF-κB activation), reporter gene assay, IκBα degradation assay, JNK kinase assay, cell proliferation assay, caspase-3/PARP cleavage assay |
Oncogene |
High |
10597252
|
| 2005 |
VEGI-192, a new isoform of TNFSF15, systemically administered suppresses tumor growth and specifically eliminates tumor endothelial cells but not vascular smooth muscle cells, with no liver or kidney toxicity. VEGI expression in normal tissue is restricted largely to endothelial cells by immunohistochemistry. |
Recombinant protein production, systemic i.p./i.v./s.c. injection in Lewis lung carcinoma mouse model, histological analysis, immunohistochemistry |
Clinical cancer research |
Medium |
16061878
|
| 2005 |
Soluble TL1A is naturally secreted from HUVECs as a 30–32 kDa protein, and its production is significantly induced by IL-1α and TNF. IL-1 is a more potent inducer than TNF, and the induction is dose- and time-dependent. |
ELISA development, Western blot under reducing/non-reducing conditions, affinity purification of soluble TL1A from conditioned medium |
Journal of immunological methods |
Medium |
15847792
|
| 2007 |
TL1A expression in human monocytes and monocyte-derived dendritic cells is specifically induced by FcγR signaling (immune complexes), correlating with surface and secreted TL1A protein. TLR agonists capable of inducing IL-6 and TNF-α do not induce surface or soluble TL1A. TL1A produced by monocytes enhances T cell IFN-γ responses. |
Stimulation assays with TLR agonists, IFN-γ, and immune complexes; surface expression by flow cytometry; TL1A ELISA; T cell co-culture assays |
Journal of immunology |
Medium |
17371957
|
| 2008 |
DR3 expression is selectively elevated in Th17 cells, and TL1A promotes proliferation of effector Th17 cells. TL1A-deficient dendritic cells have reduced capacity to support Th17 differentiation and proliferation. In experimental autoimmune encephalomyelitis (EAE), TL1A-knockout animals show decreased clinical severity and reduced Th17 differentiation and effector function. |
TL1A-knockout mouse generation, EAE model, flow cytometry analysis of Th17 cells, DC co-culture differentiation assays |
The Journal of experimental medicine |
High |
18411337
|
| 2009 |
Crystal structure of the human TL1A extracellular domain at 2.5 Å resolution reveals a jelly-roll fold typical of the TNF superfamily. Mutagenesis and biochemical characterization define the binding interface for DcR3 and DR3 receptors, suggesting the mode of TL1A–DcR3 interaction differs from other characterized TNF ligand/receptor complexes. |
X-ray crystallography (2.5 Å resolution), site-directed mutagenesis, biochemical binding assays |
Biochemistry |
High |
19522538
|
| 2009 |
VEGI (TNFSF15) inhibits the differentiation of endothelial progenitor cells (EPCs) from bone marrow Sca1+ mononuclear cells, decreasing endothelial cell marker expression and capability for adhesion, migration, and capillary-like structure formation. VEGI induces apoptosis of differentiated EPCs but not early-stage EPCs; in early-stage EPCs it increases phospho-ERK and decreases phospho-Akt, while in differentiated EPCs it activates NF-κB, JNK, and caspase-3. DR3 is present only on differentiated EPCs and mediates VEGI-induced apoptosis, as shown by neutralizing anti-DR3 antibodies or recombinant DR3 extracellular domain. |
In vitro EPC differentiation assay, flow cytometry (EPC markers), adhesion/migration/Matrigel assays, Western blot (signaling), neutralizing antibodies against DR3 |
Blood |
High |
19329781
|
| 2009 |
Multiple bacterial species (gram-negative, gram-positive, anaerobes) induce TL1A expression in human APCs (monocytes and monocyte-derived DCs) via TLR signaling, which is inhibited by downstream blockade of p38 MAPK and NF-κB. Bacterially induced TL1A production by APCs potentiates CD4+ T-cell IFN-γ production. |
Bacterial stimulation assays, TL1A mRNA/protein quantification, p38 and NF-κB pathway inhibitors, T cell co-culture IFN-γ assays |
European journal of immunology |
Medium |
19839006
|
| 2011 |
TNFSF15 is a downstream transcriptional target of AMPK, mediated through LITAF binding to a specific sequence in the TNFSF15 promoter region. AMPK activation by AICAR upregulates TNFSF15, and this is abrogated by shRNA or dominant-negative AMPK α1. TNFSF15 inhibits growth of prostate cancer cells and bovine aortic endothelial cells in vitro, and intratumoral injection of TNFSF15 reduces tumor size and blood vessel number in vivo. |
shRNA knockdown, dominant-negative AMPK mutant, promoter binding assay (LITAF-TNFSF15 promoter), cell proliferation assay, xenograft tumor model, histological analysis |
Oncogene |
Medium |
21217782
|
| 2010 |
Sustained TL1A expression on DCs drives goblet cell hyperplasia in the ileum associated with elevated IL-13 levels and increased IL-13- and IL-17-producing T cells. TL1A directly stimulates Treg cell proliferation in vitro and enhances Treg turnover in vivo via DR3 signaling. TL1A also attenuates the ability of Treg cells to suppress conventional T cells, requiring DR3 signaling in either conventional or Treg cells. |
TL1A transgenic mice (DC-specific expression), IL-13 quantification, flow cytometry of T cell subsets, in vitro Treg proliferation assay, suppression assays |
Mucosal immunology |
Medium |
20962771
|
| 2010 |
Two functionally distinct isoforms of TL1A are generated by differential ectodomain shedding: TL1A(L72-L251) and a novel shorter fragment TL1A(V84-L251). TL1A overexpression induces premature senescence in HUVECs and endothelial progenitor cells, and knockdown of TL1A partially reverts senescence. The novel TL1A(V84-L251) fragment induces growth arrest and apoptosis in HUVECs. |
Ectodomain shedding characterization, TL1A overexpression and knockdown (siRNA) in HUVECs and EPCs, senescence assays, apoptosis/growth arrest assays |
The journals of gerontology. Series A, Biological sciences and medical sciences |
Medium |
20675618
|
| 2013 |
Soluble TL1A-Ig (a dimer of TL1A trimers) signals through TNFRSF25 to rapidly expand Foxp3+ Tregs in vivo (up to 30–35% of CD4+ T cells within 5 days), dependent on TCR engagement with MHC class II. TL1A-Ig-expanded Tregs express high levels of KLRG1 and CD103, are highly suppressive ex vivo, and protect against allergic lung inflammation in a mouse asthma model. |
TL1A-Ig fusion protein generation/characterization (SEC-MALS), in vivo Treg expansion assay, flow cytometry, MHC class II dependency experiments, asthma model (eosinophil/BAL analysis) |
Journal of immunology |
Medium |
23319737
|
| 2013 |
TNFSF15 (VEGI) inhibits EPC-supported vasculogenesis by simultaneously promoting mFlt1 (membrane VEGFR1) degradation through Akt deactivation-dependent, ubiquitin-assisted degradation, and upregulating sFlt1 (soluble VEGFR1) expression via the PKC/Src/Erk1/2 signaling pathway. TNFSF15 also promotes alternative splicing of Flt1 in favor of sFlt1 by downregulating nuclear protein Jmjd6, thereby disrupting VEGF/PlGF-induced eNOS and MAPK p38 activation and inhibiting EPC-supported vasculogenesis in vivo. |
In vitro EPC culture, Western blot (phosphorylation, ubiquitination), pathway inhibitors (PKC, Src, Erk1/2), Jmjd6 knockdown, in vivo Matrigel implant model, alternative splicing analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
23918400
|
| 2014 |
TNFSF15:DR3 interactions in human macrophages amplify PRR-initiated MAPK/NF-κB/PI3K signaling and cytokine secretion. Mechanism involves TACE-induced cleavage of TNFSF15 to soluble form, which then signals via TRADD/FADD/MALT-1 and caspase-8 to induce autocrine IL-1 secretion. The rs6478108 A disease-risk allele is associated with increased TNFSF15 expression and increased PRR-induced signaling and cytokines in macrophages. |
Human macrophage stimulation assays, pathway inhibitors (TACE, NF-κB, PI3K, MAPK), caspase-8 inhibition, ELISA, genotype-stratified analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
25197060
|
| 2014 |
TL1A directly signals through DR3 on intestinal myofibroblasts to increase collagen and IL-31Ra expression. Blocking TL1A with neutralizing antibody or deletion of DR3 reduces the number of fibroblasts and myofibroblasts and reverses established murine colonic fibrosis, reducing connective tissue growth factor, TGF-β1, and IGF-1 expression. |
Neutralizing anti-Tl1a antibody treatment in murine colitis model, Dr3 knockout mice, primary intestinal myofibroblast culture with TL1A stimulation, collagen and cytokine quantification |
Mucosal immunology |
High |
24850426
|
| 2015 |
Soluble trimeric TL1A fully activates DR3-associated pro- and anti-apoptotic signaling pathways without requiring secondary oligomerization. DR3 is efficiently activated by soluble TL1A trimers (similar to TNFR1, unlike TRAIL receptors which require oligomerization). TL1A binding induces DR3 internalization, and the affinity of TL1A-DR3 interaction was measured in a cell-based system. |
Cell-based DR3 activation assays (apoptosis, NF-κB), comparison with oligomerized vs. non-oligomerized soluble ligand, receptor internalization assay, affinity measurement |
The FEBS journal |
Medium |
26509650
|
| 2016 |
TNFSF15 suppresses VEGF production in endothelial cells by stimulating miR-29b expression through activation of the JNK–GATA3 signaling pathway. miR-29b targets the 3'-UTR of VEGF transcript. Blocking TNFSF15 activity (via DR3 siRNA or neutralizing antibody 4-3H) inhibits miR-29b and reinstates VEGF production. JNK inhibitor (SP600125) or JNK siRNA eradicates TNFSF15-induced GATA3 expression; GATA3 siRNA suppresses TNFSF15-induced miR-29b. |
miRNA expression assay, 3'-UTR reporter assay, siRNA knockdown (DR3, JNK, GATA3), neutralizing antibody, JNK inhibitor (SP600125), qRT-PCR, Western blot |
Oncotarget |
Medium |
27589684
|
| 2017 |
TNFSF15 inhibits VEGF-induced vascular hyperpermeability in vitro and in vivo through DR3-mediated dephosphorylation of VEGFR2. Upon TNFSF15-DR3 interaction, SHP-1 (a phosphatase) becomes associated with DR3, and a ternary protein complex consisting of VEGFR2, DR3, and SHP-1 is formed, providing the structural basis for VEGFR2 dephosphorylation. |
In vitro vascular permeability assay, in vivo permeability model, Co-immunoprecipitation (VEGFR2–DR3–SHP-1 complex), Western blot (VEGFR2 phosphorylation), siRNA knockdown |
FASEB journal |
High |
28183800
|
| 2018 |
Membrane-bound TL1A and soluble TL1A have differential roles: membrane TL1A promotes inflammatory cytokine expression in the lung dependent on DR3 on T cells (adaptive immunity), while soluble TL1A alone is sufficient to induce intestinal type 2 inflammation independently of T cells (innate lymphoid cells). These differential activities were demonstrated using membrane-restricted TL1A-transgenic mice. |
Generation of membrane-restricted TL1A-transgenic mice (cleavage site mutant), comparison with soluble TL1A-expressing mice, DR3-deficient crosses, lung cytokine and intestinal pathology analysis |
Journal of immunology |
High |
29335258
|
| 2010 |
Membrane-bound TL1A (TL1A-M) can bind DR3 through cell-cell contact and signal to induce IFN-γ secretion enhancement from IL-12/IL-18-primed CD4+ T cells. This was blocked by anti-TL1A antibody, demonstrating functional signaling capacity of the membrane-bound form. |
TL1A-M expression in HEK-293 cells, DR3-Fc binding assay, co-incubation with primed T cells, IFN-γ ELISA, antibody blocking |
FEBS letters |
Medium |
20403353
|
| 2013 |
TL1A directly induces proinflammatory cytokines including TNF-α from CD3+CD161+ (CD4+CD161+) T cells. Anti-TNF-α failed to block TL1A-induced cytokine production, indicating TL1A effects are independent of and upstream of TNFα. |
Isolation of CD4+CD161+ T cells, TL1A stimulation, cytokine ELISA, anti-TNFα antibody blocking experiments |
Mucosal immunology |
Medium |
23250276
|
| 2013 |
Plasma cells (but not B cells) express high levels of DR3 and are direct targets of TL1A. In the presence of TL1A, plasma cells survive better and produce more anti-collagen antibody. TL1A gene knockout mice show ameliorated collagen-induced arthritis with reduced pathogenic anti-collagen Ab titers. |
TL1A KO mouse generation, CIA model, flow cytometry (DR3 expression on B cells and plasma cells), plasma cell survival and antibody production assays |
Journal of immunology |
Medium |
24140642
|
| 2020 |
Autocrine/paracrine TNFSF15:DR3 interactions are required for optimal PRR-induced bacterial clearance in human macrophages. TNFSF15 induces bacterial uptake via pyruvate dehydrogenase kinase 1 and promotes intracellular bacterial clearance through reactive oxygen species, nitric oxide synthase 2, and autophagy upregulation. The TNFSF15-initiated TRAF2/RIPK1/RIP3 pathway (but not the FADD/MALT-1/caspase-8 pathway) is required for MAPK and NF-κB activation and antimicrobial pathways. |
Human monocyte-derived macrophage assays, flow cytometry, ELISA, gentamicin protection assay (bacterial clearance), pathway inhibitors (TRAF2, RIPK1, RIP3, FADD, caspase-8), ROS/NOS2/autophagy assays, genotype-stratified analysis of IBD risk carriers |
Cellular and molecular gastroenterology and hepatology |
High |
32827707
|
| 2020 |
TL1A directly signals through DR3 on lung fibroblasts and bronchial epithelial cells to induce proliferation and production of fibrotic molecules (collagen, periostin), driving airway remodeling. Neutralization of TL1A or genetic deletion of DR3 restricts peribronchial smooth muscle mass and lung collagen accumulation in allergen- and bleomycin-driven mouse models. Recombinant TL1A administered into naive mouse airways drives remodeling independently of innate lymphoid cells and adaptive immunity. |
Anti-TL1A antibody neutralization, DR3-KO mice, recombinant TL1A instillation in naive mice, human lung fibroblast and bronchial epithelial cell culture with TL1A stimulation, collagen/periostin quantification |
Journal of immunology |
High |
32958689
|
| 2020 |
Direct TL1A-DR3 signaling on fibroblasts promotes intestinal fibrosis in vivo. Transfer of TL1A-overexpressing T cells into Rag-/- mice with DR3 deleted specifically on fibroblasts (Rag-/-Dr3ΔCol1a2) showed reduced intestinal fibrosis and attenuated fibroblast activation and migration compared to Rag-/- controls, despite similar inflammation. RNA-Seq of TL1A-stimulated fibroblasts identified Rho signal transduction as a major activated pathway, and inhibition of this pathway modulated TL1A-mediated fibroblast functions. |
Adoptive T cell transfer into Rag-/-, Rag-/-Dr3-/-, and Rag-/-Dr3ΔCol1a2 mice, collagen deposition quantification, RNA-Seq of TL1A-stimulated fibroblasts, Rho pathway inhibition |
Scientific reports |
High |
33097818
|
| 2014 |
DR3 mediates TNFSF15-induced endothelial cell apoptosis. siRNA-mediated knockdown of DR3 confers resistance to TNFSF15-induced apoptosis. DR3-depleted cells show increased ERK1/2 MAPK activity and upregulation of anti-apoptotic proteins c-FLIP and Bcl-2. Additionally, TNFα-induced apoptosis is also dependent on TNFSF15 upregulation stimulated by TNFα, as TNFSF15 siRNA or neutralizing antibody inhibits TNFα-induced apoptosis. |
siRNA knockdown of DR3 and TNFSF15, in vivo Matrigel angiogenesis assay, endothelial cell culture apoptosis assays, Western blot (ERK, c-FLIP, Bcl-2), neutralizing antibody (4-3H) |
The international journal of biochemistry & cell biology |
Medium |
25161149
|
| 2024 |
TL1A is constitutively expressed as an epithelial alarmin in alveolar epithelium at steady state in mice and humans (including airway basal cells). Upon synergistic activation by IL-33 and TL1A, lung ILC2s acquire a transient IL-9highGATA3low 'ILC9' phenotype and produce large amounts of IL-9. Large-scale proteomic analysis, lung intravital microscopy, and adoptive transfer experiments revealed that IL-9high distinguishes a multicytokine-producing ILC2 state with increased capacity to initiate IL-5-dependent allergic airway inflammation. |
Proteomic analyses, lung intravital microscopy, adoptive transfer of ILC9 cells, in vitro ILC2 stimulation (IL-33 + TL1A), flow cytometry, IL-9/IL-5 functional assays in mouse models |
The Journal of experimental medicine |
High |
38597952
|
| 2018 |
The IBD-risk haplotype at TNFSF15 is associated with decreased expression of TNFSF15 by peripheral blood monocytes (at both RNA and protein levels) under various stimulation conditions, maintained after macrophage differentiation. The regulatory polymorphism controlling TNFSF15 expression was localized to the upstream regulatory region of the gene using recall-by-genotype fine-mapping. Genetically regulated TNFSF15 has functional relevance as shown by a T cell costimulation assay. |
Recall-by-genotype functional fine-mapping, allele-specific expression measurement, monocyte stimulation assays (RNA and protein), macrophage differentiation, T cell costimulation assay |
PLoS genetics |
Medium |
30199539
|
| 2009 |
TL1A gene haplotype B increases TL1A expression in response to FcγR stimulation in Jewish CD patients positive for OmpC antibody. CD14+ monocytes from patients homozygous for haplotype B express higher levels of TL1A, and peripheral monocytes show increased membrane TL1A expression. |
SNP haplotyping, monocyte isolation and FcγR stimulation, ELISA for TL1A protein, flow cytometry for membrane TL1A |
PloS one |
Medium |
19262684
|
| 2018 |
TL1A-mediated intestinal fibrosis and fibroblast activation are dependent on specific microbial populations. In germ-free Tl1a-transgenic mice, the pro-fibrotic and inflammatory phenotype is abrogated. Reconstitution with SPF (but not healthy human) microbiota restores intestinal collagen deposition and fibroblast activation. Candidate organisms correlating with fibrosis were identified and shown to directly impact fibroblast function in vitro. |
Germ-free Tl1a-transgenic mice, microbiome reconstitution by gavage (SPF vs. human donor stool), collagen deposition quantification, fibroblast migration/activation assays in vitro |
Mucosal immunology |
Medium |
29988118
|
| 2021 |
TL1A promotes EMT (epithelial-mesenchymal transition) in intestinal epithelial cells via the TGF-β1/Smad3 pathway, with increased expression of IL-13 and EMT transcription factors ZEB1 and Snail1. TL1A-induced EMT is inhibited by anti-TL1A antibody or BMP-7 in vitro. |
IBD patient tissue analysis, TL1A transgenic mouse DSS-colitis model, HT-29 cell stimulation with TL1A/anti-TL1A/BMP-7, Western blot and qPCR for EMT markers (E-cadherin, FSP1, α-SMA), pathway analysis (TGF-β1/Smad3) |
Mediators of inflammation |
Medium |
34257516
|
| 2018 |
TL1A mediates RA fibroblast-like synoviocyte (FLS) migration and activates Indian Hedgehog (IHH) signaling, including upregulation of IHH and its receptors PTCH1 and PTCH2. This effect is mediated through TNFR2, and blocking TL1A with TNFR2 antagonist reduces IHH expression and FLS migration. |
RA-FLS isolation from patients, TL1A stimulation, TNFR2 antagonist blocking, qRT-PCR and Western blot (IHH, PTCH1/2), FLS migration assay |
European cytokine network |
Low |
29748156
|
| 2008 |
Chicken TL1A (ChTL1A) binds to TNFR2 and decoy receptor 3 (DcR3) and decreases the viability of CHO-K1 cells transfected with chicken TNFR2 or DcR3. ChTL1A acts as a proinflammatory cytokine in chickens, and anti-ChTL1A antibody prevents LPS-induced increases in plasma nitrite/nitrate and acute phase proteins. |
CHO-K1 transfection with chicken TNFR2/DcR3, cell viability assay, LPS injection in vivo, acute phase protein measurement, anti-ChTL1A antibody neutralization |
Journal of immunology |
Low |
18523299
|