{"gene":"TNFSF14","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2008,"finding":"LIGHT (TNFSF14) activates two cell surface receptors, the Herpesvirus Entry Mediator (HVEM) and the Lymphotoxin-beta Receptor (LTβR), and is inhibited by soluble decoy receptor-3 (DcR3). HVEM also binds BTLA (an Ig superfamily member), making HVEM a molecular switch between stimulatory (LIGHT-HVEM) and inhibitory (BTLA-HVEM) signaling.","method":"Receptor binding studies, genetic and pharmacological manipulation in experimental models","journal":"Immunological reviews","confidence":"High","confidence_rationale":"Tier 2 — replicated across multiple labs, mechanistic pathway placement established by multiple orthogonal approaches","pmids":["18613837","19760072"],"is_preprint":false},{"year":2014,"finding":"TNFSF14/LIGHT protein expression on NK cells is induced by three primary mechanisms: engagement of CD16, synergistic activity of multiple NK-cell activation receptors recognizing target cells, and cytokines IL-2/IL-15. Tumor- and cytokine-activated NK cells induce dendritic cell maturation in a TNFSF14-dependent manner.","method":"Gene expression profiling, protein expression assays, antibody blockade of TNFSF14 to confirm DC maturation dependence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — reciprocal functional blocking with defined cellular phenotype, multiple activation conditions tested","pmids":["25512551"],"is_preprint":false},{"year":2014,"finding":"LIGHT (TNFSF14) signals through the lymphotoxin β receptor (LTβR) in the colon to regulate the innate immune response and mediate recovery from intestinal inflammation. Tnfsf14-/- mice develop more severe colitis, with increased innate immune cell accumulation and higher cytokine levels.","method":"Tnfsf14-/- knockout mice, DSS colitis model, CD4+ T cell transfer colitis, histology, cytokine/chemokine measurement, flow cytometry","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, receptor identified via LTβR-specific analysis","pmids":["24560868"],"is_preprint":false},{"year":2007,"finding":"Platelet-associated LIGHT (TNFSF14) mediates adhesion of platelets to human vascular endothelium under static and dynamic flow conditions. Soluble LIGHT stimulates endothelial cells to upregulate ICAM-1, tissue factor, and IL-8 via NFκB activation. LIGHT receptors TR2 (DcR3) and LTβR are expressed on native human endothelial cells.","method":"FACS analysis of receptor expression, platelet adhesion assay with antibody blockade, NFκB activation assay, ICAM-1/TF/IL-8 transcriptional and translational measurement","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, antibody blockade confirms LIGHT-dependence, receptor expression confirmed","pmids":["17938804"],"is_preprint":false},{"year":2014,"finding":"LIGHT (TNFSF14) induces osteoclastogenesis in RANKL-dependent and RANKL-independent manners, and the synergistic effect with sub-optimal RANKL occurs through phosphorylation of Akt, NFκB, and JNK pathways. LIGHT also inhibits osteoblastogenesis partly through sclerostin expressed by monocytes.","method":"In vitro osteoclastogenesis assay from healthy donor and MM patient bone marrow cultures, western blotting for Akt/NFκB/JNK phosphorylation, CFU-F/CFU-OB colony assays, osteoblastic marker expression","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution with signaling pathway identification and multiple orthogonal assays","pmids":["25460501"],"is_preprint":false},{"year":2011,"finding":"Soluble LIGHT (TNFSF14) enhances adipose tissue inflammatory responses through its interaction with HVEM. LIGHT displays chemotactic activity for macrophages and T cells and enhances inflammatory cytokine release from macrophages, adipocytes, and SVF cells. LIGHT-induced responses are blunted by anti-HVEM neutralizing antibody or HVEM knockout.","method":"LIGHT gene expression analysis in macrophages/adipocytes, chemotaxis assay, cytokine ELISA, HVEM neutralizing antibody, HVEM knockout cells","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 — receptor specificity confirmed by KO and neutralizing antibody, multiple functional assays","pmids":["21236258"],"is_preprint":false},{"year":2018,"finding":"TNFSF14/LIGHT, as a non-canonical NF-κB stimulus, induces HIF-2α (but not HIF-1α) at the transcriptional level in cancer cells via a mechanism dependent on the p52 NF-κB subunit, which binds directly to the HIF-2α promoter.","method":"Non-canonical NF-κB pathway stimulation, transcriptional reporter assays, chromatin immunoprecipitation (p52 binding to HIF-2α promoter), gene knockdown","journal":"Cells","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrates direct p52 binding to HIF-2α promoter, multiple orthogonal methods","pmids":["30096845"],"is_preprint":false},{"year":2018,"finding":"TNFSF14/LIGHT promotes inflammatory and remodeling activity in human lung fibroblasts (HLFs) via LTβR but not HVEM. LIGHT promotes HLF cell cycle progression and proliferation, upregulates ICAM-1, VCAM-1, IL-6, GM-CSF, CCL5, CCL20, CXCL5, CXCL11, CXCL12, MMP-9, ADAM8, IL-33, and TSLP, with overlapping and synergistic activities with IL-13.","method":"Receptor expression confirmation on primary HLFs, siRNA/antibody-based receptor blockade (LTβR vs. HVEM), proliferation assays, gene/protein expression analysis, cytokine ELISA","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 — receptor specificity confirmed by differential blockade, multiple orthogonal assays on primary human cells","pmids":["29616048"],"is_preprint":false},{"year":2016,"finding":"LIGHT (TNFSF14) interacts with LTβR constitutively expressed on human bone marrow-derived mesenchymal stem cells (BM-MSCs), inducing their survival and proliferation by increasing cyclins B1, D1, D3, E, CDK1, and CDK2 while decreasing p27. LIGHT also induces PDGF and TGFβ production via STAT3 and Smad3 activation.","method":"LTβR surface expression confirmation, cell viability/proliferation assay, cell cycle analysis, cyclin/CDK western blot, ELISA for PDGF/TGFβ, immunoblotting for STAT3/Smad3","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — multiple downstream signaling events identified in primary human cells, single lab study","pmids":["27835685"],"is_preprint":false},{"year":2019,"finding":"TNFSF14 is identified as a direct target of miR-326. MiR-326 dampens pulmonary inflammation by targeting TNFSF14 (and autophagy via PTBP1), and lncRNA HOTAIR facilitates inflammation by sponging miR-326, thereby releasing TNFSF14.","method":"Luciferase reporter assay for miR-326 targeting of TNFSF14 3'UTR, western blot, in vivo mouse silicosis model with miR-326 intervention, lncRNA sponging assay","journal":"Chemical research in toxicology","confidence":"Medium","confidence_rationale":"Tier 2 — direct target validation by reporter assay with in vivo confirmation, single lab","pmids":["31642316"],"is_preprint":false},{"year":2010,"finding":"Forced expression of LIGHT (TNFSF14) in tumors increases IFNγ and chemoattractant cytokines (IL-1a, MIG, MIP-2) in the tumor microenvironment, increases tumor-infiltrating CD8+ T cells, and expands functional T cells recognizing multiple tumor antigens including HPV16 E7.","method":"Adenoviral LIGHT expression in tumors, cytokine measurement, flow cytometry of tumor-infiltrating lymphocytes, T cell functional assays, secondary tumor challenge","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — defined mechanistic pathway (LIGHT→chemokine induction→T cell recruitment), single lab","pmids":["20460520"],"is_preprint":false},{"year":2019,"finding":"Genetic inactivation of LIGHT (Tnfsf14-/-) in high-fat high-cholesterol diet-fed mice improves glucose tolerance and insulin sensitivity, reduces hepatic steatosis and inflammation, decreases adipose tissue pro-inflammatory macrophages, and reduces proinflammatory cytokine secretion. HVEM and LTβR are markedly upregulated in livers of diet-fed mice, and LIGHT deficiency reduces expression of Zbtb16, Klf6, and Tlr4 in liver.","method":"Tnfsf14-/- knockout mice, glucose/insulin tolerance tests, NAFLD activity scoring, flow cytometry of adipose tissue macrophages, cytokine ELISA, hepatic gene expression analysis","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined metabolic and inflammatory phenotypes, multiple orthogonal methods","pmids":["31388695"],"is_preprint":false},{"year":2020,"finding":"LIGHT (TNFSF14) promotes osteolytic bone metastases in non-small cell lung cancer. Tnfsf14-/- mice show no bone loss after intratibial LLC-1 tumor implantation, while wild-type mice show increased osteoclast number and reduced osteoblasts. LIGHT stimulates osteoclastogenesis via RANKL, and anti-LIGHT or RANK-Fc inhibit osteoclastogenesis in PBMC cultures from bone metastatic patients.","method":"Tnfsf14-/- mouse model, intratibial tumor implantation, histomorphometry, PBMC osteoclastogenesis assay with anti-LIGHT/RANK-Fc blockade, serum RANKL/LIGHT measurement","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 — KO mouse model with defined bone phenotype, human ex vivo blockade confirms RANKL-dependence","pmids":["31826304"],"is_preprint":false},{"year":2023,"finding":"LIGHT (TNFSF14) promotes cardiac fibrosis and atrial fibrillation vulnerability by promoting macrophage M2 polarization and TGF-β1 secretion via the PI3Kγ/SGK1 pathway, which in turn stimulates collagen synthesis and myofibroblast transition in cardiac fibroblasts. PI3Kγ and SGK1 inhibitors block this effect.","method":"rLIGHT injection in mice, MASSON staining, atrial burst pacing, RNA sequencing of heart, BMDM polarization assay, PI3Kγ/SGK1 inhibitor treatment, western blotting, cardiac fibroblast conditioned medium experiments","journal":"Journal of translational medicine","confidence":"High","confidence_rationale":"Tier 2 — pathway identified by RNA-seq and confirmed by inhibitor studies both in vivo and in vitro, multiple orthogonal assays","pmids":["37580750"],"is_preprint":false},{"year":2023,"finding":"LIGHT (TNFSF14) co-expressed in CAR-T cells enhances cytotoxicity and cytokine production, increases CCL19 and CCL21 expression in surrounding cells via paracrine signaling, and promotes T cell migration. LIGHT CAR-T cells showed superior anti-tumor efficacy and improved tumor infiltration in NSG mice, and murine LIGHT-OT-1 T cells normalized tumor blood vessels and enforced intratumoral lymphoid structures in syngeneic mouse models.","method":"LIGHT-expressing CAR-T cell construction, cytotoxicity assays, cytokine measurement, T cell migration assay, NSG and C57BL/6 syngeneic mouse tumor models, immunohistochemistry","journal":"Molecular therapy","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vivo models with defined mechanistic readouts, single lab","pmids":["37408308"],"is_preprint":false},{"year":2024,"finding":"TNFSF14 is produced at the inflamed joint during gout flare and enhances the inflammatory response induced by LPS and MSU crystals. TNFSF14 blockade reduces this inflammatory response. Single nucleotide polymorphisms of TNFSF14 affect the ability of myeloid cells to produce inflammatory cytokines.","method":"Olink targeted proteomics, ex vivo and in vitro experiments with TNFSF14 stimulation and blockade, SNP analysis of TNFSF14 effect on cytokine production","journal":"Annals of the rheumatic diseases","confidence":"Medium","confidence_rationale":"Tier 2 — functional blockade experiment confirms pro-inflammatory role, SNP-function link established, validated in independent cohort","pmids":["38373842"],"is_preprint":false}],"current_model":"TNFSF14 (LIGHT) is a TNF superfamily cytokine expressed as a homotrimer on activated immune cells (T cells, NK cells, platelets, monocytes) that signals through two receptors—HVEM and LTβR—to promote inflammation, lymphoid tissue organization, dendritic cell maturation, osteoclastogenesis, fibrosis, and anti-tumor immunity, while HVEM also binds BTLA to inhibit T cell activation, making HVEM a molecular switch between pro- and anti-inflammatory signaling; downstream mechanisms include NFκB (canonical via LTβR, non-canonical via p52/HIF-2α), PI3Kγ/SGK1, and Akt/JNK pathways depending on the cellular context."},"narrative":{"teleology":[{"year":2007,"claim":"Establishing that platelet-expressed LIGHT directly activates endothelial cells revealed a vascular inflammatory mechanism: LIGHT engages LTβR on endothelium to induce NF-κB-dependent upregulation of ICAM-1, tissue factor, and IL-8, and mediates platelet-endothelial adhesion.","evidence":"FACS receptor expression, platelet adhesion assays with antibody blockade, NF-κB activation assays on human endothelial cells","pmids":["17938804"],"confidence":"High","gaps":["Whether platelet-derived LIGHT contributes to thrombosis in vivo was not tested","Relative contribution of HVEM vs. LTβR on endothelium not fully resolved"]},{"year":2008,"claim":"Defining the dual-receptor system—HVEM and LTβR—and the BTLA-HVEM inhibitory axis established HVEM as a bidirectional molecular switch, resolving how the same receptor mediates opposing immune outcomes depending on the ligand.","evidence":"Receptor binding studies, genetic and pharmacological manipulation across multiple experimental systems","pmids":["18613837","19760072"],"confidence":"High","gaps":["Structural basis for competitive binding of LIGHT vs. BTLA to HVEM not resolved","In vivo quantitative balance between stimulatory and inhibitory arms not established"]},{"year":2010,"claim":"Demonstrating that forced LIGHT expression in tumors recruits CD8⁺ T cells and expands polyclonal anti-tumor immunity established LIGHT as a driver of adaptive immune infiltration into the tumor microenvironment.","evidence":"Adenoviral LIGHT expression in tumors, cytokine profiling, flow cytometry of tumor-infiltrating lymphocytes, secondary tumor rechallenge","pmids":["20460520"],"confidence":"Medium","gaps":["Relative contribution of HVEM vs. LTβR on tumor stroma not dissected","Not confirmed with endogenous LIGHT expression levels"]},{"year":2011,"claim":"Identifying HVEM as the required receptor for LIGHT-driven adipose tissue inflammation—macrophage chemotaxis and proinflammatory cytokine release—connected LIGHT to metabolic inflammation.","evidence":"Chemotaxis and cytokine assays with HVEM neutralizing antibody and HVEM knockout cells","pmids":["21236258"],"confidence":"High","gaps":["Downstream signaling pathway in adipocytes not defined","In vivo contribution to obesity-associated inflammation not tested at this stage"]},{"year":2014,"claim":"Three studies collectively defined LIGHT's roles in mucosal immunity, NK cell biology, and bone remodeling: LIGHT via LTβR protects against intestinal inflammation; NK cells upregulate LIGHT to mature dendritic cells; and LIGHT drives osteoclastogenesis through Akt/NF-κB/JNK pathways both with and independently of RANKL.","evidence":"Tnfsf14⁻/⁻ mice in DSS colitis, NK cell activation profiling with TNFSF14 blockade, in vitro osteoclastogenesis with signaling pathway western blots","pmids":["24560868","25512551","25460501"],"confidence":"High","gaps":["How LIGHT-LTβR signaling in the colon mechanistically restrains innate inflammation at the molecular level is unclear","Whether LIGHT-driven osteoclastogenesis uses HVEM or LTβR was not fully resolved"]},{"year":2016,"claim":"Showing that LIGHT signals through LTβR on mesenchymal stem cells to activate STAT3/Smad3 and induce PDGF/TGFβ production expanded the known cell types responsive to LIGHT and implicated it in tissue repair and fibrogenic circuits.","evidence":"LTβR expression confirmation, proliferation/cell cycle assays, cyclin/CDK immunoblotting, STAT3/Smad3 phosphorylation analysis in primary human BM-MSCs","pmids":["27835685"],"confidence":"Medium","gaps":["Single-lab study; independent replication needed","In vivo relevance of LIGHT-MSC axis not demonstrated"]},{"year":2018,"claim":"Two discoveries clarified receptor-selective downstream pathways: LIGHT induces HIF-2α transcription via non-canonical NF-κB (p52) in cancer cells, and LIGHT signals selectively through LTβR (not HVEM) in lung fibroblasts to promote proliferation and inflammatory/remodeling gene programs.","evidence":"ChIP showing p52 binding to HIF-2α promoter; siRNA/antibody receptor blockade discriminating LTβR from HVEM in primary human lung fibroblasts","pmids":["30096845","29616048"],"confidence":"High","gaps":["Whether non-canonical NF-κB/HIF-2α axis operates through LTβR or HVEM in cancer cells not specified","Contribution of LIGHT-LTβR fibroblast axis to human lung fibrosis in vivo not established"]},{"year":2019,"claim":"Genetic deletion of LIGHT in mice improved metabolic parameters—glucose tolerance, insulin sensitivity, hepatic steatosis, and adipose inflammation—establishing LIGHT as a systemic mediator of diet-induced metabolic disease through both HVEM and LTβR upregulated in liver.","evidence":"Tnfsf14⁻/⁻ mice on high-fat high-cholesterol diet, glucose/insulin tolerance tests, NAFLD scoring, adipose macrophage flow cytometry, hepatic gene expression","pmids":["31388695"],"confidence":"High","gaps":["Cell-type-specific contributions of LIGHT (immune vs. parenchymal) not dissected","Whether HVEM or LTβR is the dominant hepatic receptor in vivo not resolved"]},{"year":2020,"claim":"Demonstrating that Tnfsf14⁻/⁻ mice are completely protected from tumor-induced osteolysis confirmed LIGHT as essential for osteoclast-mediated bone destruction in cancer, operating via RANKL induction.","evidence":"Tnfsf14⁻/⁻ mouse intratibial tumor model, histomorphometry, anti-LIGHT and RANK-Fc blockade in human PBMC osteoclastogenesis","pmids":["31826304"],"confidence":"High","gaps":["Direct receptor (HVEM vs. LTβR) mediating bone metastasis phenotype not identified","Applicability beyond lung cancer bone metastasis not tested"]},{"year":2023,"claim":"Two studies defined new effector mechanisms: LIGHT drives cardiac fibrosis and atrial fibrillation susceptibility by polarizing macrophages to M2 via PI3Kγ/SGK1 and inducing TGFβ1-dependent myofibroblast transition; and LIGHT co-expressed in CAR-T cells enhances anti-tumor efficacy by promoting chemokine-driven T cell infiltration and intratumoral lymphoid structure formation.","evidence":"rLIGHT injection in mice with PI3Kγ/SGK1 inhibitors, RNA-seq, BMDM polarization; LIGHT-CAR-T cells in NSG and syngeneic tumor models with immunohistochemistry","pmids":["37580750","37408308"],"confidence":"High","gaps":["Whether PI3Kγ/SGK1 pathway is HVEM- or LTβR-dependent in macrophages not determined","Long-term safety of LIGHT-expressing CAR-T cells not assessed"]},{"year":2024,"claim":"Identifying TNFSF14 at inflamed joints during gout flare and demonstrating that TNFSF14 SNPs modulate myeloid cytokine production established genetic variation in TNFSF14 as a determinant of inflammatory disease severity.","evidence":"Olink proteomics of synovial fluid, TNFSF14 blockade in ex vivo crystal-stimulated assays, SNP-function analysis","pmids":["38373842"],"confidence":"Medium","gaps":["Which TNFSF14 receptor mediates crystal-driven inflammation not identified","Functional mechanism linking specific SNPs to altered TNFSF14 expression or activity not resolved"]},{"year":null,"claim":"Key unresolved questions include: the structural basis for competitive LIGHT/BTLA binding to HVEM, the cell-type-specific receptor selection rules (HVEM vs. LTβR) in vivo, and how LIGHT integrates canonical versus non-canonical NF-κB signaling across different tissue contexts.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure of the ternary LIGHT-HVEM-BTLA complex","No systematic in vivo cell-type-specific receptor ablation studies","Integration of multiple downstream pathways (NF-κB, PI3Kγ/SGK1, STAT3, Akt/JNK) into a unified signaling model lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,3,5,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[3,5,15]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,2,5,10,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,4,6,7,8,13]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,12]}],"complexes":[],"partners":["TNFRSF14","LTBR","TNFRSF6B","BTLA"],"other_free_text":[]},"mechanistic_narrative":"TNFSF14 (LIGHT) is a TNF superfamily cytokine that functions as a pleiotropic mediator of inflammation, tissue remodeling, and immune cell recruitment by signaling through two receptors—HVEM and LTβR—whose differential engagement dictates context-dependent outcomes in immunity, metabolism, and fibrosis. LIGHT activates NF-κB (canonical and non-canonical pathways), Akt/JNK, PI3Kγ/SGK1, and STAT3/Smad3 signaling depending on the receptor and cell type, driving endothelial activation, osteoclastogenesis, macrophage polarization, fibroblast proliferation, and dendritic cell maturation [PMID:17938804, PMID:25460501, PMID:37580750, PMID:27835685, PMID:25512551]. HVEM additionally binds the inhibitory receptor BTLA, making it a molecular switch between costimulatory and coinhibitory signaling on T cells [PMID:18613837]. In vivo, LIGHT deficiency protects against diet-induced metabolic inflammation and hepatic steatosis and prevents osteolytic bone metastasis, while forced LIGHT expression in tumors promotes CD8⁺ T cell infiltration and anti-tumor immunity [PMID:31388695, PMID:31826304, PMID:20460520]."},"prefetch_data":{"uniprot":{"accession":"O43557","full_name":"Tumor necrosis factor ligand superfamily member 14","aliases":["Herpes virus entry mediator ligand","HVEM-L","Herpesvirus entry mediator ligand"],"length_aa":240,"mass_kda":26.4,"function":"Cytokine that binds to TNFRSF3/LTBR. Binding to the decoy receptor TNFRSF6B modulates its effects. Acts as a ligand for TNFRSF14/HVEM (PubMed:10754304, PubMed:9462508). Upon binding to TNFRSF14/HVEM, delivers costimulatory signals to T cells, leading to T cell proliferation and IFNG production (PubMed:10754304)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O43557/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TNFSF14","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TNFSF14","total_profiled":1310},"omim":[{"mim_id":"619289","title":"ZINC FINGER PROTEIN 91, ATYPICAL E3 UBIQUITIN LIGASE; ZFP91","url":"https://www.omim.org/entry/619289"},{"mim_id":"607925","title":"B- AND T-LYMPHOCYTE ATTENUATOR; BTLA","url":"https://www.omim.org/entry/607925"},{"mim_id":"606945","title":"LOW DENSITY LIPOPROTEIN RECEPTOR; LDLR","url":"https://www.omim.org/entry/606945"},{"mim_id":"604520","title":"TUMOR NECROSIS FACTOR LIGAND SUPERFAMILY, MEMBER 14; TNFSF14","url":"https://www.omim.org/entry/604520"},{"mim_id":"602746","title":"TUMOR NECROSIS FACTOR RECEPTOR SUPERFAMILY, MEMBER 14; TNFRSF14","url":"https://www.omim.org/entry/602746"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":24.3},{"tissue":"liver","ntpm":92.6}],"url":"https://www.proteinatlas.org/search/TNFSF14"},"hgnc":{"alias_symbol":["LIGHT","LTg","HVEM-L","CD258"],"prev_symbol":[]},"alphafold":{"accession":"O43557","domains":[{"cath_id":"2.60.120.40","chopping":"96-240","consensus_level":"high","plddt":94.5186,"start":96,"end":240},{"cath_id":"1.20.5","chopping":"37-75","consensus_level":"medium","plddt":84.6059,"start":37,"end":75}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43557","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43557-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43557-F1-predicted_aligned_error_v6.png","plddt_mean":84.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TNFSF14","jax_strain_url":"https://www.jax.org/strain/search?query=TNFSF14"},"sequence":{"accession":"O43557","fasta_url":"https://rest.uniprot.org/uniprotkb/O43557.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43557/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43557"}},"corpus_meta":[{"pmid":"19575582","id":"PMC_19575582","title":"Sensing 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HVEM also binds BTLA (an Ig superfamily member), making HVEM a molecular switch between stimulatory (LIGHT-HVEM) and inhibitory (BTLA-HVEM) signaling.\",\n      \"method\": \"Receptor binding studies, genetic and pharmacological manipulation in experimental models\",\n      \"journal\": \"Immunological reviews\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across multiple labs, mechanistic pathway placement established by multiple orthogonal approaches\",\n      \"pmids\": [\"18613837\", \"19760072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TNFSF14/LIGHT protein expression on NK cells is induced by three primary mechanisms: engagement of CD16, synergistic activity of multiple NK-cell activation receptors recognizing target cells, and cytokines IL-2/IL-15. Tumor- and cytokine-activated NK cells induce dendritic cell maturation in a TNFSF14-dependent manner.\",\n      \"method\": \"Gene expression profiling, protein expression assays, antibody blockade of TNFSF14 to confirm DC maturation dependence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal functional blocking with defined cellular phenotype, multiple activation conditions tested\",\n      \"pmids\": [\"25512551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LIGHT (TNFSF14) signals through the lymphotoxin β receptor (LTβR) in the colon to regulate the innate immune response and mediate recovery from intestinal inflammation. Tnfsf14-/- mice develop more severe colitis, with increased innate immune cell accumulation and higher cytokine levels.\",\n      \"method\": \"Tnfsf14-/- knockout mice, DSS colitis model, CD4+ T cell transfer colitis, histology, cytokine/chemokine measurement, flow cytometry\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, receptor identified via LTβR-specific analysis\",\n      \"pmids\": [\"24560868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Platelet-associated LIGHT (TNFSF14) mediates adhesion of platelets to human vascular endothelium under static and dynamic flow conditions. Soluble LIGHT stimulates endothelial cells to upregulate ICAM-1, tissue factor, and IL-8 via NFκB activation. LIGHT receptors TR2 (DcR3) and LTβR are expressed on native human endothelial cells.\",\n      \"method\": \"FACS analysis of receptor expression, platelet adhesion assay with antibody blockade, NFκB activation assay, ICAM-1/TF/IL-8 transcriptional and translational measurement\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, antibody blockade confirms LIGHT-dependence, receptor expression confirmed\",\n      \"pmids\": [\"17938804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LIGHT (TNFSF14) induces osteoclastogenesis in RANKL-dependent and RANKL-independent manners, and the synergistic effect with sub-optimal RANKL occurs through phosphorylation of Akt, NFκB, and JNK pathways. LIGHT also inhibits osteoblastogenesis partly through sclerostin expressed by monocytes.\",\n      \"method\": \"In vitro osteoclastogenesis assay from healthy donor and MM patient bone marrow cultures, western blotting for Akt/NFκB/JNK phosphorylation, CFU-F/CFU-OB colony assays, osteoblastic marker expression\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution with signaling pathway identification and multiple orthogonal assays\",\n      \"pmids\": [\"25460501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Soluble LIGHT (TNFSF14) enhances adipose tissue inflammatory responses through its interaction with HVEM. LIGHT displays chemotactic activity for macrophages and T cells and enhances inflammatory cytokine release from macrophages, adipocytes, and SVF cells. LIGHT-induced responses are blunted by anti-HVEM neutralizing antibody or HVEM knockout.\",\n      \"method\": \"LIGHT gene expression analysis in macrophages/adipocytes, chemotaxis assay, cytokine ELISA, HVEM neutralizing antibody, HVEM knockout cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor specificity confirmed by KO and neutralizing antibody, multiple functional assays\",\n      \"pmids\": [\"21236258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TNFSF14/LIGHT, as a non-canonical NF-κB stimulus, induces HIF-2α (but not HIF-1α) at the transcriptional level in cancer cells via a mechanism dependent on the p52 NF-κB subunit, which binds directly to the HIF-2α promoter.\",\n      \"method\": \"Non-canonical NF-κB pathway stimulation, transcriptional reporter assays, chromatin immunoprecipitation (p52 binding to HIF-2α promoter), gene knockdown\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrates direct p52 binding to HIF-2α promoter, multiple orthogonal methods\",\n      \"pmids\": [\"30096845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TNFSF14/LIGHT promotes inflammatory and remodeling activity in human lung fibroblasts (HLFs) via LTβR but not HVEM. LIGHT promotes HLF cell cycle progression and proliferation, upregulates ICAM-1, VCAM-1, IL-6, GM-CSF, CCL5, CCL20, CXCL5, CXCL11, CXCL12, MMP-9, ADAM8, IL-33, and TSLP, with overlapping and synergistic activities with IL-13.\",\n      \"method\": \"Receptor expression confirmation on primary HLFs, siRNA/antibody-based receptor blockade (LTβR vs. HVEM), proliferation assays, gene/protein expression analysis, cytokine ELISA\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor specificity confirmed by differential blockade, multiple orthogonal assays on primary human cells\",\n      \"pmids\": [\"29616048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LIGHT (TNFSF14) interacts with LTβR constitutively expressed on human bone marrow-derived mesenchymal stem cells (BM-MSCs), inducing their survival and proliferation by increasing cyclins B1, D1, D3, E, CDK1, and CDK2 while decreasing p27. LIGHT also induces PDGF and TGFβ production via STAT3 and Smad3 activation.\",\n      \"method\": \"LTβR surface expression confirmation, cell viability/proliferation assay, cell cycle analysis, cyclin/CDK western blot, ELISA for PDGF/TGFβ, immunoblotting for STAT3/Smad3\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple downstream signaling events identified in primary human cells, single lab study\",\n      \"pmids\": [\"27835685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TNFSF14 is identified as a direct target of miR-326. MiR-326 dampens pulmonary inflammation by targeting TNFSF14 (and autophagy via PTBP1), and lncRNA HOTAIR facilitates inflammation by sponging miR-326, thereby releasing TNFSF14.\",\n      \"method\": \"Luciferase reporter assay for miR-326 targeting of TNFSF14 3'UTR, western blot, in vivo mouse silicosis model with miR-326 intervention, lncRNA sponging assay\",\n      \"journal\": \"Chemical research in toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct target validation by reporter assay with in vivo confirmation, single lab\",\n      \"pmids\": [\"31642316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Forced expression of LIGHT (TNFSF14) in tumors increases IFNγ and chemoattractant cytokines (IL-1a, MIG, MIP-2) in the tumor microenvironment, increases tumor-infiltrating CD8+ T cells, and expands functional T cells recognizing multiple tumor antigens including HPV16 E7.\",\n      \"method\": \"Adenoviral LIGHT expression in tumors, cytokine measurement, flow cytometry of tumor-infiltrating lymphocytes, T cell functional assays, secondary tumor challenge\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined mechanistic pathway (LIGHT→chemokine induction→T cell recruitment), single lab\",\n      \"pmids\": [\"20460520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Genetic inactivation of LIGHT (Tnfsf14-/-) in high-fat high-cholesterol diet-fed mice improves glucose tolerance and insulin sensitivity, reduces hepatic steatosis and inflammation, decreases adipose tissue pro-inflammatory macrophages, and reduces proinflammatory cytokine secretion. HVEM and LTβR are markedly upregulated in livers of diet-fed mice, and LIGHT deficiency reduces expression of Zbtb16, Klf6, and Tlr4 in liver.\",\n      \"method\": \"Tnfsf14-/- knockout mice, glucose/insulin tolerance tests, NAFLD activity scoring, flow cytometry of adipose tissue macrophages, cytokine ELISA, hepatic gene expression analysis\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined metabolic and inflammatory phenotypes, multiple orthogonal methods\",\n      \"pmids\": [\"31388695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIGHT (TNFSF14) promotes osteolytic bone metastases in non-small cell lung cancer. Tnfsf14-/- mice show no bone loss after intratibial LLC-1 tumor implantation, while wild-type mice show increased osteoclast number and reduced osteoblasts. LIGHT stimulates osteoclastogenesis via RANKL, and anti-LIGHT or RANK-Fc inhibit osteoclastogenesis in PBMC cultures from bone metastatic patients.\",\n      \"method\": \"Tnfsf14-/- mouse model, intratibial tumor implantation, histomorphometry, PBMC osteoclastogenesis assay with anti-LIGHT/RANK-Fc blockade, serum RANKL/LIGHT measurement\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse model with defined bone phenotype, human ex vivo blockade confirms RANKL-dependence\",\n      \"pmids\": [\"31826304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LIGHT (TNFSF14) promotes cardiac fibrosis and atrial fibrillation vulnerability by promoting macrophage M2 polarization and TGF-β1 secretion via the PI3Kγ/SGK1 pathway, which in turn stimulates collagen synthesis and myofibroblast transition in cardiac fibroblasts. PI3Kγ and SGK1 inhibitors block this effect.\",\n      \"method\": \"rLIGHT injection in mice, MASSON staining, atrial burst pacing, RNA sequencing of heart, BMDM polarization assay, PI3Kγ/SGK1 inhibitor treatment, western blotting, cardiac fibroblast conditioned medium experiments\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pathway identified by RNA-seq and confirmed by inhibitor studies both in vivo and in vitro, multiple orthogonal assays\",\n      \"pmids\": [\"37580750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LIGHT (TNFSF14) co-expressed in CAR-T cells enhances cytotoxicity and cytokine production, increases CCL19 and CCL21 expression in surrounding cells via paracrine signaling, and promotes T cell migration. LIGHT CAR-T cells showed superior anti-tumor efficacy and improved tumor infiltration in NSG mice, and murine LIGHT-OT-1 T cells normalized tumor blood vessels and enforced intratumoral lymphoid structures in syngeneic mouse models.\",\n      \"method\": \"LIGHT-expressing CAR-T cell construction, cytotoxicity assays, cytokine measurement, T cell migration assay, NSG and C57BL/6 syngeneic mouse tumor models, immunohistochemistry\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo models with defined mechanistic readouts, single lab\",\n      \"pmids\": [\"37408308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TNFSF14 is produced at the inflamed joint during gout flare and enhances the inflammatory response induced by LPS and MSU crystals. TNFSF14 blockade reduces this inflammatory response. Single nucleotide polymorphisms of TNFSF14 affect the ability of myeloid cells to produce inflammatory cytokines.\",\n      \"method\": \"Olink targeted proteomics, ex vivo and in vitro experiments with TNFSF14 stimulation and blockade, SNP analysis of TNFSF14 effect on cytokine production\",\n      \"journal\": \"Annals of the rheumatic diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional blockade experiment confirms pro-inflammatory role, SNP-function link established, validated in independent cohort\",\n      \"pmids\": [\"38373842\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TNFSF14 (LIGHT) is a TNF superfamily cytokine expressed as a homotrimer on activated immune cells (T cells, NK cells, platelets, monocytes) that signals through two receptors—HVEM and LTβR—to promote inflammation, lymphoid tissue organization, dendritic cell maturation, osteoclastogenesis, fibrosis, and anti-tumor immunity, while HVEM also binds BTLA to inhibit T cell activation, making HVEM a molecular switch between pro- and anti-inflammatory signaling; downstream mechanisms include NFκB (canonical via LTβR, non-canonical via p52/HIF-2α), PI3Kγ/SGK1, and Akt/JNK pathways depending on the cellular context.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TNFSF14 (LIGHT) is a TNF superfamily cytokine that functions as a pleiotropic mediator of inflammation, tissue remodeling, and immune cell recruitment by signaling through two receptors—HVEM and LTβR—whose differential engagement dictates context-dependent outcomes in immunity, metabolism, and fibrosis. LIGHT activates NF-κB (canonical and non-canonical pathways), Akt/JNK, PI3Kγ/SGK1, and STAT3/Smad3 signaling depending on the receptor and cell type, driving endothelial activation, osteoclastogenesis, macrophage polarization, fibroblast proliferation, and dendritic cell maturation [PMID:17938804, PMID:25460501, PMID:37580750, PMID:27835685, PMID:25512551]. HVEM additionally binds the inhibitory receptor BTLA, making it a molecular switch between costimulatory and coinhibitory signaling on T cells [PMID:18613837]. In vivo, LIGHT deficiency protects against diet-induced metabolic inflammation and hepatic steatosis and prevents osteolytic bone metastasis, while forced LIGHT expression in tumors promotes CD8⁺ T cell infiltration and anti-tumor immunity [PMID:31388695, PMID:31826304, PMID:20460520].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing that platelet-expressed LIGHT directly activates endothelial cells revealed a vascular inflammatory mechanism: LIGHT engages LTβR on endothelium to induce NF-κB-dependent upregulation of ICAM-1, tissue factor, and IL-8, and mediates platelet-endothelial adhesion.\",\n      \"evidence\": \"FACS receptor expression, platelet adhesion assays with antibody blockade, NF-κB activation assays on human endothelial cells\",\n      \"pmids\": [\"17938804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether platelet-derived LIGHT contributes to thrombosis in vivo was not tested\", \"Relative contribution of HVEM vs. LTβR on endothelium not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining the dual-receptor system—HVEM and LTβR—and the BTLA-HVEM inhibitory axis established HVEM as a bidirectional molecular switch, resolving how the same receptor mediates opposing immune outcomes depending on the ligand.\",\n      \"evidence\": \"Receptor binding studies, genetic and pharmacological manipulation across multiple experimental systems\",\n      \"pmids\": [\"18613837\", \"19760072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for competitive binding of LIGHT vs. BTLA to HVEM not resolved\", \"In vivo quantitative balance between stimulatory and inhibitory arms not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that forced LIGHT expression in tumors recruits CD8⁺ T cells and expands polyclonal anti-tumor immunity established LIGHT as a driver of adaptive immune infiltration into the tumor microenvironment.\",\n      \"evidence\": \"Adenoviral LIGHT expression in tumors, cytokine profiling, flow cytometry of tumor-infiltrating lymphocytes, secondary tumor rechallenge\",\n      \"pmids\": [\"20460520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of HVEM vs. LTβR on tumor stroma not dissected\", \"Not confirmed with endogenous LIGHT expression levels\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying HVEM as the required receptor for LIGHT-driven adipose tissue inflammation—macrophage chemotaxis and proinflammatory cytokine release—connected LIGHT to metabolic inflammation.\",\n      \"evidence\": \"Chemotaxis and cytokine assays with HVEM neutralizing antibody and HVEM knockout cells\",\n      \"pmids\": [\"21236258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling pathway in adipocytes not defined\", \"In vivo contribution to obesity-associated inflammation not tested at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Three studies collectively defined LIGHT's roles in mucosal immunity, NK cell biology, and bone remodeling: LIGHT via LTβR protects against intestinal inflammation; NK cells upregulate LIGHT to mature dendritic cells; and LIGHT drives osteoclastogenesis through Akt/NF-κB/JNK pathways both with and independently of RANKL.\",\n      \"evidence\": \"Tnfsf14⁻/⁻ mice in DSS colitis, NK cell activation profiling with TNFSF14 blockade, in vitro osteoclastogenesis with signaling pathway western blots\",\n      \"pmids\": [\"24560868\", \"25512551\", \"25460501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LIGHT-LTβR signaling in the colon mechanistically restrains innate inflammation at the molecular level is unclear\", \"Whether LIGHT-driven osteoclastogenesis uses HVEM or LTβR was not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing that LIGHT signals through LTβR on mesenchymal stem cells to activate STAT3/Smad3 and induce PDGF/TGFβ production expanded the known cell types responsive to LIGHT and implicated it in tissue repair and fibrogenic circuits.\",\n      \"evidence\": \"LTβR expression confirmation, proliferation/cell cycle assays, cyclin/CDK immunoblotting, STAT3/Smad3 phosphorylation analysis in primary human BM-MSCs\",\n      \"pmids\": [\"27835685\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study; independent replication needed\", \"In vivo relevance of LIGHT-MSC axis not demonstrated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Two discoveries clarified receptor-selective downstream pathways: LIGHT induces HIF-2α transcription via non-canonical NF-κB (p52) in cancer cells, and LIGHT signals selectively through LTβR (not HVEM) in lung fibroblasts to promote proliferation and inflammatory/remodeling gene programs.\",\n      \"evidence\": \"ChIP showing p52 binding to HIF-2α promoter; siRNA/antibody receptor blockade discriminating LTβR from HVEM in primary human lung fibroblasts\",\n      \"pmids\": [\"30096845\", \"29616048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether non-canonical NF-κB/HIF-2α axis operates through LTβR or HVEM in cancer cells not specified\", \"Contribution of LIGHT-LTβR fibroblast axis to human lung fibrosis in vivo not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic deletion of LIGHT in mice improved metabolic parameters—glucose tolerance, insulin sensitivity, hepatic steatosis, and adipose inflammation—establishing LIGHT as a systemic mediator of diet-induced metabolic disease through both HVEM and LTβR upregulated in liver.\",\n      \"evidence\": \"Tnfsf14⁻/⁻ mice on high-fat high-cholesterol diet, glucose/insulin tolerance tests, NAFLD scoring, adipose macrophage flow cytometry, hepatic gene expression\",\n      \"pmids\": [\"31388695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific contributions of LIGHT (immune vs. parenchymal) not dissected\", \"Whether HVEM or LTβR is the dominant hepatic receptor in vivo not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrating that Tnfsf14⁻/⁻ mice are completely protected from tumor-induced osteolysis confirmed LIGHT as essential for osteoclast-mediated bone destruction in cancer, operating via RANKL induction.\",\n      \"evidence\": \"Tnfsf14⁻/⁻ mouse intratibial tumor model, histomorphometry, anti-LIGHT and RANK-Fc blockade in human PBMC osteoclastogenesis\",\n      \"pmids\": [\"31826304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct receptor (HVEM vs. LTβR) mediating bone metastasis phenotype not identified\", \"Applicability beyond lung cancer bone metastasis not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Two studies defined new effector mechanisms: LIGHT drives cardiac fibrosis and atrial fibrillation susceptibility by polarizing macrophages to M2 via PI3Kγ/SGK1 and inducing TGFβ1-dependent myofibroblast transition; and LIGHT co-expressed in CAR-T cells enhances anti-tumor efficacy by promoting chemokine-driven T cell infiltration and intratumoral lymphoid structure formation.\",\n      \"evidence\": \"rLIGHT injection in mice with PI3Kγ/SGK1 inhibitors, RNA-seq, BMDM polarization; LIGHT-CAR-T cells in NSG and syngeneic tumor models with immunohistochemistry\",\n      \"pmids\": [\"37580750\", \"37408308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PI3Kγ/SGK1 pathway is HVEM- or LTβR-dependent in macrophages not determined\", \"Long-term safety of LIGHT-expressing CAR-T cells not assessed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying TNFSF14 at inflamed joints during gout flare and demonstrating that TNFSF14 SNPs modulate myeloid cytokine production established genetic variation in TNFSF14 as a determinant of inflammatory disease severity.\",\n      \"evidence\": \"Olink proteomics of synovial fluid, TNFSF14 blockade in ex vivo crystal-stimulated assays, SNP-function analysis\",\n      \"pmids\": [\"38373842\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which TNFSF14 receptor mediates crystal-driven inflammation not identified\", \"Functional mechanism linking specific SNPs to altered TNFSF14 expression or activity not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for competitive LIGHT/BTLA binding to HVEM, the cell-type-specific receptor selection rules (HVEM vs. LTβR) in vivo, and how LIGHT integrates canonical versus non-canonical NF-κB signaling across different tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of the ternary LIGHT-HVEM-BTLA complex\", \"No systematic in vivo cell-type-specific receptor ablation studies\", \"Integration of multiple downstream pathways (NF-κB, PI3Kγ/SGK1, STAT3, Akt/JNK) into a unified signaling model lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 3, 5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [3, 5, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 2, 5, 10, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4, 6, 7, 8, 13]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TNFRSF14\", \"LTBR\", \"TNFRSF6B\", \"BTLA\"],\n    \"other_free_text\": []\n  }\n}\n```"}