{"gene":"TNFRSF1B","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1998,"finding":"TNFRSF1B (TNFR80)-mediated enhancement of TNFR60-induced cell death requires TRAF2: TNFR80 costimulation depletes functional TRAF2 (which normally suppresses apoptosis downstream of TNFR60), thereby abolishing TRAF2-dependent anti-apoptotic signaling and selectively enhancing TNFR60-induced cell death. This cross-talk is specific to TNFR60 and does not affect Fas-, ceramide-, or TRAIL-induced death.","method":"Overexpression of wild-type and dominant-negative TRAF2 mutants in HeLa cells; receptor-specific antibody stimulation; JNK activation assays; cell death assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (overexpression, dominant-negative mutant, JNK assays, cell death readouts), mechanistic model supported by genetic and biochemical evidence in single rigorous study","pmids":["9743381"],"is_preprint":false},{"year":1997,"finding":"Simultaneous activation of both TNFR60 and TNFRSF1B (TNFR80) by membrane-bound TNF (but not soluble TNF) in HIV-infected T cells cooperatively shifts the response from HIV production toward induction of apoptosis, demonstrating that TNFRSF1B is an important modulator of TNF responsiveness via cooperative signaling with TNFR60.","method":"Receptor-specific agonistic and antagonistic antibodies; coculture with cells expressing non-cleavable membrane TNF; HIV production and cell death assays in ACH-2 cells and primary blood lymphocytes","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal receptor-specific antibody experiments plus cell-based functional assays with two orthogonal readouts (HIV production and cell death), replicated in primary cells","pmids":["8996244"],"is_preprint":false},{"year":1995,"finding":"Both TNFRSF1B (TNFR80) and TNFR60 are required for full TNF-α-dependent tissue factor expression in human umbilical vein endothelial cells: selective triggering of either receptor alone partially induces tissue factor, but simultaneous activation of both is required for complete induction; membrane TNF-α drives synergistic signaling through both receptor types.","method":"Antagonistic and agonistic receptor-specific antibodies; coculture with cells expressing non-cleavable membrane TNF; tissue factor production assay in HUVECs","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (blocking antibodies, agonistic antibodies, membrane TNF coculture) in the same study with quantitative functional readout","pmids":["7544644"],"is_preprint":false},{"year":1995,"finding":"TNFRSF1B (TNFR80/CD120b) is the primary signal-transducing receptor for TNF-mediated activation of NK cell cytotoxic function: purified NK cells (CD56+CD3−) express TNFR80 but not TNFR60; anti-TNFR80 antibody mimics TNF in enhancing NK cytotoxicity and, in combination with IL-2, supports lymphokine-activated killer development, whereas only anti-TNFR80 (not anti-TNFR60) abrogates IL-2-induced LAK activity.","method":"Monoclonal antibody-mediated receptor-specific ligation and blockade; NK cytotoxicity assays on K562 targets; flow cytometry; LAK cell assays","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — receptor-specific antibody gain- and loss-of-function experiments with quantitative cytotoxicity readouts in primary NK cells","pmids":["7543923"],"is_preprint":false},{"year":1998,"finding":"TNFRSF1B (CD120b/p75) cooperates with CD120a (p55) to regulate nitric oxide and iNOS expression in mouse macrophages: CD120a ligation alone is necessary and sufficient for transient iNOS mRNA and NO production, but co-ligation of CD120b markedly prolongs iNOS mRNA and protein expression and potentiates NO accumulation, likely by acting as a 'ligand-passer' to CD120a and initiating an additional sustained signaling event.","method":"Antibody-mediated specific cross-linking of each receptor; iNOS mRNA quantification; NO2− measurement; iNOS protein western blot; blocking antibodies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (receptor cross-linking, blocking antibodies, mRNA, protein, metabolite readouts) establishing both necessity and sufficiency of each receptor's contribution","pmids":["9712914"],"is_preprint":false},{"year":2002,"finding":"CD40-induced TNF-α secretion by B cells subsequently signals through TNFRSF1B (CD120b) to enhance IgM secretion; TRAF2 is required for CD120b-mediated IgM production, but TRAF2-dependent CD40 signals cannot substitute for TRAF2-dependent CD120b signals in this response, indicating distinct TRAF2 utilization by the two receptors.","method":"Dominant-negative TRAF2 overexpression; TRAF2-deficient B cells; anti-TNF blocking antibodies; IgM ELISA; CH12.LX B cell line","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic (TRAF2 knockout) and dominant-negative approaches with defined functional readout, replicated across two orthogonal perturbation strategies","pmids":["11907088"],"is_preprint":false},{"year":2004,"finding":"CD40 and TNFRSF1B (CD120b) use primarily divergent mechanisms to activate NF-κB, but both partially require TRAF2 for IgM secretion; only CD40 (not CD120b) requires TRAF2 for JNK (c-Jun N-terminal kinase) activation, demonstrating that these two TNFR family members use distinct TRAF2-dependent pathways to mediate overlapping downstream events.","method":"Wild-type and TRAF2-deficient B cells expressing CD40 or hybrid CD40-CD120b molecules; NF-κB reporter assays; JNK kinase assay; IgM ELISA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — TRAF2-deficient genetic model combined with chimeric receptor constructs and multiple pathway readouts in a single rigorous study","pmids":["15485859"],"is_preprint":false},{"year":1996,"finding":"The intracellular domain of TNFRSF1B (TNFR80) promotes noncovalent self-aggregation of soluble receptor forms, which lowers the TNF off-rate and markedly increases TNF-neutralizing capacity compared to the monomeric extracellular domain alone.","method":"Production of multiple soluble TNFR80 constructs in insect cells; surface plasmon resonance (ligand off-rate kinetics); TNF bioactivity neutralization assays","journal":"Journal of interferon & cytokine research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with surface plasmon resonance kinetic measurements and functional neutralization assay; single lab but two orthogonal methods","pmids":["8807502"],"is_preprint":false},{"year":2003,"finding":"Elastase is the serine protease responsible for constitutive shedding of TNFRSF1B (TNF-R75) from resting human neutrophils, generating a 28-kDa receptor fragment; upon stimulation (TNF or fMLP), a metalloprotease additionally contributes to shedding and generates a 40-kDa fragment.","method":"Selective serine protease inhibitors (DFP, elastase-specific inhibitors, α1-protease inhibitor) and metalloprotease inhibitors; western blot detection of shed receptor fragments from neutrophil supernatants","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzyme inhibition with multiple mechanistically distinct inhibitors, direct biochemical identification of shed fragment size; single lab but orthogonal inhibitor panel","pmids":["14572651"],"is_preprint":false},{"year":2019,"finding":"TNFRSF1B is the primary driver of necroptosis in γ-irradiated peripheral blood mononuclear cells (PBMCs), most likely via membrane-bound TNF-α signaling; necroptosis (but not apoptosis) is required for the pro-angiogenic activity of the PBMC secretome.","method":"Necroptosis inhibition experiments; TNFRSF1B identification from transcriptome analysis; scanning electron microscopy and image stream analysis of cell death morphology; aortic ring angiogenesis assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mechanistic identification via transcriptomics with functional necroptosis inhibition validation, single lab","pmids":["31570701"],"is_preprint":false},{"year":2021,"finding":"LncRNA NEAT1 stabilizes TNFRSF1B mRNA (demonstrated by RNA pulldown co-precipitation and RNA decay assay), increasing TNFRSF1B protein levels, which in turn promotes NF-κB p65 nuclear translocation and downstream inflammatory cytokine (IL-8, MCP-1) expression in intestinal epithelial cells stimulated with TNF-α.","method":"RNA pulldown assay; RNA decay assay; siRNA knockdown and overexpression; western blot for TNFRSF1B and NF-κB p65; immunofluorescence for p65 translocation; ELISA for cytokines","journal":"Annals of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pulldown plus decay assay plus rescue experiments; single lab with multiple orthogonal methods","pmids":["34268386"],"is_preprint":false},{"year":2024,"finding":"Galactosylceramide (GalCer) suppresses TNFRSF1B promoter activity and gene expression in breast cancer cells via a P53-dependent mechanism: cells with high GalCer express lower P53, and siRNA-mediated P53 knockdown phenocopies GalCer in reducing TNFRSF1B expression and promoter activity, linking GalCer-driven P53 suppression to downregulation of TNFRSF1B transcription.","method":"Promoter-luciferase reporter assays; siRNA knockdown of P53; western blot and RT-qPCR for TNFRSF1B expression in MDA-MB-231 and MCF7 cells with high vs. no GalCer","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay plus siRNA epistasis experiment in two cell lines; single lab","pmids":["38254878"],"is_preprint":false},{"year":2023,"finding":"TNF-α inhibits chondrogenic differentiation of human adipose-derived stem cells by signaling through TNFRSF1B (TNFR2) to upregulate RELA (NF-κB p65) expression, which in turn increases OPA1 expression and promotes mitochondrial fusion.","method":"Gene microarray and RT-qPCR; western blot for TNFRSF1B, RELA, OPA1; Alcian blue and Sirius red staining for chondrogenesis; fluorescent mitochondrial imaging","journal":"Journal of orthopaedic surgery and research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlative gene expression profiling with some protein validation; no direct knockdown/rescue of TNFRSF1B to establish causal chain; single lab","pmids":["37312126"],"is_preprint":false},{"year":2023,"finding":"TNFRSF1B (TNFR2) knockout in K562 cells produces distinct transcriptional profiles from TNFR1 knockout following TNF-α stimulation, with altered regulation of pathways associated with inflammation, apoptosis, and cell proliferation, demonstrating non-redundant roles of the two receptors in TNF-α-induced transcriptional responses.","method":"CRISPR knockout of TNFRSF1A and TNFRSF1B in K562 cells; RNA-seq transcriptome profiling after TNF-α stimulation","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean CRISPR knockout with genome-wide transcriptional readout; single lab","pmids":["38138998"],"is_preprint":false},{"year":2024,"finding":"TNFRSF1B signaling blockade (siRNA knockdown or anti-TNF biologic etanercept blocking LTα3-TNFR2 axis) protects airway epithelial cells from oxidative stress-induced death; lymphotoxin-α (LTA) is overexpressed in airway epithelial cells under oxidative stress and serves as the relevant ligand activating TNFRSF1B in this context.","method":"siRNA knockdown of TNFRSF1B in CF submucosal gland cells; etanercept treatment; cell viability assays under oxidative stress; bioinformatic RNAi screen analysis","journal":"Antioxidants","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — siRNA knockdown with functional viability readout plus pharmacological validation with etanercept; single lab","pmids":["38539900"],"is_preprint":false},{"year":2025,"finding":"Selective ablation of TNFRSF1B (TNFR2) in astrocytes (GfapcreERT2:Tnfrsf1bfl/fl mice) impairs hippocampal long-term potentiation (LTP), disrupts expression of synaptic proteins (SNARE complex molecules, glutamate receptor subunits, glutamate transporters), increases glial reactivity, impairs astrocyte calcium dynamics, and causes cognitive deficits, with more pronounced effects in males than females.","method":"Conditional astrocyte-specific TNFR2 knockout mice; electrophysiology (LTP); behavioral cognitive assays; astrocyte RNA-seq; calcium imaging; immunostaining for synaptic and glial markers","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional knockout with multiple orthogonal functional readouts (electrophysiology, behavior, transcriptomics, calcium imaging); preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"Tnfrsf1b knockout in zebrafish increases susceptibility to Klebsiella pneumoniae infection with elevated malformation/mortality, increased macrophage and neutrophil recruitment, and elevated pro-inflammatory cytokines (TNF-α, IL-1β); rescue by mRNA injection and overexpression in wild-type confers protection, establishing a protective role for tnfrsf1b in host defense.","method":"CRISPR/Cas9 tnfrsf1b knockout zebrafish; K. pneumoniae infection model; mRNA rescue injection; TNFR inhibitor (R7050) pharmacological blockade; qRT-PCR and ELISA for cytokines; immune cell staining","journal":"Infection and drug resistance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus mRNA rescue plus pharmacological inhibition in zebrafish ortholog; multiple orthogonal approaches; single lab","pmids":["41170162"],"is_preprint":false},{"year":1996,"finding":"The human TNFRSF1B gene spans ~43 kbp, consists of 10 exons and 9 introns, and its 5'-flanking promoter region contains consensus binding elements for transcription factors including T cell factor-1, Ikaros, AP-1, NF-κB, Sp1, IL-6RE, ISRE, GAS, and CK-2, consistent with regulated expression in hematopoietic cells.","method":"Genomic library screening; restriction mapping; DNA sequencing; promoter sequence analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — complete gene structure determination with direct sequencing; single lab but comprehensive structural characterization","pmids":["8702885"],"is_preprint":false}],"current_model":"TNFRSF1B (TNFR2/p75/CD120b) is a type I transmembrane TNF receptor that signals primarily through TRAF2 recruitment; it functions as a co-receptor that cooperates with TNFR1 (TNFR60) to regulate cell death, NF-κB activation, JNK signaling, and iNOS/nitric oxide production, while also transducing distinct TRAF2-dependent signals for B cell IgM secretion and NK cell cytotoxic activation; its extracellular domain is shed from cell surfaces by elastase (resting cells) and a metalloprotease (stimulated cells) to generate soluble decoy receptor; in astrocytes it is required for normal hippocampal synaptic plasticity and LTP; and it mediates necroptosis downstream of membrane-bound TNF-α in irradiated PBMCs."},"narrative":{"mechanistic_narrative":"TNFRSF1B (TNFR2/TNFR80/CD120b/p75) is a TNF receptor that operates largely as a cooperative, signal-modulating partner of TNFR1 (TNFR60), shaping cellular responses to TNF-α across cell death, inflammation, and immune activation [PMID:8996244, PMID:7544644]. Its signaling depends on TRAF2: by recruiting and depleting functional TRAF2, TNFR2 co-stimulation removes TRAF2-dependent anti-apoptotic protection and selectively enhances TNFR1-induced cell death, a cross-talk specific to the TNFR1 pathway [PMID:9743381]. TNFR2 preferentially responds to membrane-bound rather than soluble TNF, and this membrane-TNF-driven cooperative signaling redirects T-cell responses toward apoptosis [PMID:8996244], drives full tissue-factor induction in endothelial cells [PMID:7544644], and prolongs iNOS expression and nitric oxide output in macrophages by acting in concert with TNFR1 [PMID:9712914]. Beyond cooperation with TNFR1, TNFR2 transduces distinct TRAF2-dependent signals: it is the primary signal-transducing receptor for TNF-mediated NK-cell cytotoxic activation [PMID:7543923], and it drives B-cell IgM secretion through a TRAF2 requirement that is non-interchangeable with CD40-derived TRAF2 signals, while diverging from CD40 in its NF-κB and JNK pathway usage [PMID:11907088, PMID:15485859]. CRISPR knockout studies confirm that TNFR2 governs a transcriptional program distinct and non-redundant from TNFR1 [PMID:38138998]. TNFR2 mediates necroptosis in irradiated PBMCs downstream of membrane TNF-α [PMID:31570701], and is required in astrocytes for normal hippocampal long-term potentiation, synaptic protein expression, and astrocyte calcium dynamics. The receptor's extracellular domain is shed to generate soluble TNF-neutralizing decoy receptor, with elastase mediating constitutive shedding from resting neutrophils and a metalloprotease contributing additional shedding upon stimulation [PMID:14572651]; self-aggregation conferred by the intracellular domain lowers the TNF off-rate and enhances neutralizing capacity of soluble receptor forms [PMID:8807502]. TNFRSF1B expression is itself regulated post-transcriptionally by lncRNA NEAT1, which stabilizes its mRNA to amplify NF-κB-driven inflammatory cytokine output [PMID:34268386].","teleology":[{"year":1995,"claim":"Established that TNFR2 is not redundant with TNFR1 but cooperates with it, since full induction of endothelial tissue factor required simultaneous triggering of both receptors via membrane TNF.","evidence":"Receptor-specific agonistic/antagonistic antibodies and membrane-TNF coculture with tissue factor readout in HUVECs","pmids":["7544644"],"confidence":"High","gaps":["Did not define the intracellular signaling adaptors mediating TNFR2's contribution","Mechanism of synergy at the receptor level unresolved"]},{"year":1995,"claim":"Identified TNFR2 as the dominant signal-transducing receptor for TNF-driven NK cytotoxicity, since NK cells express TNFR2 but not TNFR1 and only anti-TNFR2 abrogated IL-2-induced LAK activity.","evidence":"Receptor-specific antibody ligation/blockade and cytotoxicity assays in primary NK cells","pmids":["7543923"],"confidence":"High","gaps":["Downstream signaling pathway for cytotoxic activation not mapped","No molecular link to specific effector machinery"]},{"year":1996,"claim":"Characterized the gene architecture and promoter, revealing transcription-factor elements consistent with regulated hematopoietic expression.","evidence":"Genomic library screening, restriction mapping, and promoter sequence analysis","pmids":["8702885"],"confidence":"Medium","gaps":["Functional activity of individual promoter elements not tested","No link to specific physiological transcriptional regulators"]},{"year":1996,"claim":"Showed that the intracellular domain drives self-aggregation of soluble receptor forms, explaining how shed/soluble TNFR2 achieves potent TNF neutralization by lowering the ligand off-rate.","evidence":"Soluble TNFR2 constructs expressed in insect cells with SPR kinetics and TNF neutralization assays","pmids":["8807502"],"confidence":"High","gaps":["Structural basis of aggregation not resolved","Relevance to membrane receptor signaling not addressed"]},{"year":1997,"claim":"Demonstrated that membrane-bound but not soluble TNF engages TNFR2 to cooperatively shift infected T-cell fate toward apoptosis, defining TNFR2 as a modulator of TNF responsiveness.","evidence":"Receptor-specific antibodies and non-cleavable membrane-TNF coculture with HIV production and death readouts in T cells and primary lymphocytes","pmids":["8996244"],"confidence":"High","gaps":["Molecular basis of membrane-TNF preference not defined","Adaptor-level mechanism not established"]},{"year":1998,"claim":"Provided the molecular mechanism for TNFR2/TNFR1 cross-talk: TNFR2 depletes functional TRAF2 to abolish anti-apoptotic signaling and selectively enhance TNFR1-induced death.","evidence":"Wild-type and dominant-negative TRAF2 overexpression with JNK and cell-death assays in HeLa cells","pmids":["9743381"],"confidence":"High","gaps":["Quantitative dynamics of TRAF2 depletion in primary cells not addressed","Did not test whether other TRAF members participate"]},{"year":1998,"claim":"Defined TNFR2 as a 'ligand-passer' that prolongs and potentiates TNFR1-driven iNOS/NO output rather than acting alone.","evidence":"Receptor-specific cross-linking and blocking antibodies with iNOS mRNA/protein and nitrite readouts in mouse macrophages","pmids":["9712914"],"confidence":"High","gaps":["The additional sustained signaling event downstream of TNFR2 was not molecularly identified","Relationship to TRAF2 not tested in this system"]},{"year":2004,"claim":"Resolved how TNFR2 uses TRAF2 distinctly from CD40, showing partial TRAF2 dependence for IgM secretion but, unlike CD40, no TRAF2 requirement for JNK activation.","evidence":"TRAF2-deficient and dominant-negative B cells with chimeric CD40-CD120b receptors and NF-κB/JNK/IgM readouts","pmids":["11907088","15485859"],"confidence":"High","gaps":["Non-TRAF2 adaptors mediating divergent NF-κB activation not identified","Mechanism rendering CD40-TRAF2 non-substitutable for TNFR2-TRAF2 unknown"]},{"year":2019,"claim":"Implicated TNFR2 as the primary driver of necroptosis in irradiated PBMCs via membrane TNF-α, linking this death modality to the secretome's pro-angiogenic activity.","evidence":"Transcriptome identification with necroptosis inhibition, cell-death morphology imaging, and aortic ring angiogenesis assay","pmids":["31570701"],"confidence":"Medium","gaps":["Membrane-TNF involvement inferred rather than directly demonstrated","Necroptotic signaling components downstream of TNFR2 not mapped"]},{"year":2021,"claim":"Identified post-transcriptional control of TNFRSF1B by lncRNA NEAT1, which stabilizes its mRNA to amplify NF-κB-driven inflammatory cytokine production.","evidence":"RNA pulldown, RNA decay assays, knockdown/overexpression, and p65 translocation readouts in intestinal epithelial cells","pmids":["34268386"],"confidence":"Medium","gaps":["Direct NEAT1-TNFRSF1B mRNA binding site not mapped","In vivo relevance not established"]},{"year":2023,"claim":"Confirmed via clean genetic ablation that TNFR2 and TNFR1 drive non-redundant transcriptional programs in response to TNF-α.","evidence":"CRISPR knockout of TNFRSF1A and TNFRSF1B in K562 cells with RNA-seq after TNF-α stimulation","pmids":["38138998"],"confidence":"Medium","gaps":["Receptor-specific transcription factors driving divergence not pinned down","Single cell-line context"]},{"year":2024,"claim":"Extended TNFR2 function into oxidative-stress contexts, showing its blockade protects airway epithelial cells via an LTα/LTα3-TNFR2 axis.","evidence":"siRNA knockdown and etanercept treatment with viability readouts under oxidative stress in CF gland cells","pmids":["38539900"],"confidence":"Medium","gaps":["Death pathway downstream of TNFR2 in this context not defined","LTα3-TNFR2 binding not directly demonstrated"]},{"year":2025,"claim":"Established a non-immune, CNS role: astrocytic TNFR2 is required for hippocampal LTP, synaptic protein expression, and astrocyte calcium dynamics, with cognitive consequences.","evidence":"Astrocyte-specific conditional TNFR2 knockout mice with electrophysiology, behavior, RNA-seq, and calcium imaging (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Molecular link from TNFR2 to synaptic protein regulation not mechanistically defined","Basis of sex-dependent effects unknown"]},{"year":2025,"claim":"Defined a protective host-defense role for the receptor in vivo, since tnfrsf1b knockout zebrafish showed heightened infection susceptibility rescued by mRNA reintroduction.","evidence":"CRISPR knockout zebrafish with K. pneumoniae infection, mRNA rescue, and pharmacological TNFR blockade","pmids":["41170162"],"confidence":"Medium","gaps":["Signaling pathway underlying protection not mapped","Translatability to mammalian immunity not addressed"]},{"year":null,"claim":"How TNFR2 ligand engagement (membrane vs soluble TNF, LTα) is converted into divergent context-specific outcomes—cooperative death, NK/B-cell activation, necroptosis, or synaptic support—through specific adaptor and downstream effector usage remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking receptor oligomerization state to signaling output","Full TRAF2-independent adaptor repertoire unknown","Determinants of cell-type-specific outcome selection undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,2,3,4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,8]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[7,8]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,3,5,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,6,10]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,1,9]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[13,14]}],"complexes":[],"partners":["TRAF2","TNFRSF1A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P20333","full_name":"Tumor necrosis factor receptor superfamily member 1B","aliases":["Tumor necrosis factor receptor 2","TNF-R2","Tumor necrosis factor receptor type II","TNF-RII","TNFR-II","p75","p80 TNF-alpha receptor"],"length_aa":461,"mass_kda":48.3,"function":"Receptor with high affinity for TNFSF2/TNF and approximately 5-fold lower affinity for homotrimeric TNFSF1/lymphotoxin-alpha. The TRAF1/TRAF2 complex recruits the apoptotic suppressors BIRC2 and BIRC3 to TNFRSF1B/TNFR2. This receptor mediates most of the metabolic effects of TNF. Isoform 2 blocks TNF-induced apoptosis, which suggests that it regulates TNF function by antagonizing its biological activity","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P20333/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TNFRSF1B","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TNFRSF1B","total_profiled":1310},"omim":[{"mim_id":"608877","title":"VACUOLAR PROTEIN SORTING 13 HOMOLOG D; VPS13D","url":"https://www.omim.org/entry/608877"},{"mim_id":"607317","title":"SPINOCEREBELLAR ATAXIA, AUTOSOMAL RECESSIVE 4; SCAR4","url":"https://www.omim.org/entry/607317"},{"mim_id":"606928","title":"BONE MINERAL DENSITY QUANTITATIVE TRAIT LOCUS 3; BMND3","url":"https://www.omim.org/entry/606928"},{"mim_id":"606496","title":"INTERLEUKIN 17F; IL17F","url":"https://www.omim.org/entry/606496"},{"mim_id":"605461","title":"INTERLEUKIN 17 RECEPTOR A; IL17RA","url":"https://www.omim.org/entry/605461"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":64.5}],"url":"https://www.proteinatlas.org/search/TNFRSF1B"},"hgnc":{"alias_symbol":["TNFBR","TNFR80","TNF-R75","TNF-R-II","p75","CD120b"],"prev_symbol":["TNFR2"]},"alphafold":{"accession":"P20333","domains":[{"cath_id":"2.10.50.10","chopping":"28-96","consensus_level":"medium","plddt":94.7051,"start":28,"end":96},{"cath_id":"-","chopping":"99-122_130-138","consensus_level":"medium","plddt":96.187,"start":99,"end":138},{"cath_id":"2.10.50.10","chopping":"141-203","consensus_level":"medium","plddt":96.7168,"start":141,"end":203}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P20333","model_url":"https://alphafold.ebi.ac.uk/files/AF-P20333-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P20333-F1-predicted_aligned_error_v6.png","plddt_mean":66.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TNFRSF1B","jax_strain_url":"https://www.jax.org/strain/search?query=TNFRSF1B"},"sequence":{"accession":"P20333","fasta_url":"https://rest.uniprot.org/uniprotkb/P20333.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P20333/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P20333"}},"corpus_meta":[{"pmid":"8702885","id":"PMC_8702885","title":"Human tumor necrosis factor receptor p75/80 (CD120b) gene structure and promoter characterization.","date":"1996","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8702885","citation_count":129,"is_preprint":false},{"pmid":"9743381","id":"PMC_9743381","title":"TNFR80-dependent enhancement of TNFR60-induced cell death is mediated by TNFR-associated factor 2 and is specific for TNFR60.","date":"1998","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/9743381","citation_count":114,"is_preprint":false},{"pmid":"12161545","id":"PMC_12161545","title":"Comment: the methionine 196 arginine polymorphism in exon 6 of the TNF receptor 2 gene (TNFRSF1B) is associated with the polycystic ovary syndrome and hyperandrogenism.","date":"2002","source":"The Journal of clinical endocrinology and 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This cross-talk is specific to TNFR60 and does not affect Fas-, ceramide-, or TRAIL-induced death.\",\n      \"method\": \"Overexpression of wild-type and dominant-negative TRAF2 mutants in HeLa cells; receptor-specific antibody stimulation; JNK activation assays; cell death assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (overexpression, dominant-negative mutant, JNK assays, cell death readouts), mechanistic model supported by genetic and biochemical evidence in single rigorous study\",\n      \"pmids\": [\"9743381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Simultaneous activation of both TNFR60 and TNFRSF1B (TNFR80) by membrane-bound TNF (but not soluble TNF) in HIV-infected T cells cooperatively shifts the response from HIV production toward induction of apoptosis, demonstrating that TNFRSF1B is an important modulator of TNF responsiveness via cooperative signaling with TNFR60.\",\n      \"method\": \"Receptor-specific agonistic and antagonistic antibodies; coculture with cells expressing non-cleavable membrane TNF; HIV production and cell death assays in ACH-2 cells and primary blood lymphocytes\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal receptor-specific antibody experiments plus cell-based functional assays with two orthogonal readouts (HIV production and cell death), replicated in primary cells\",\n      \"pmids\": [\"8996244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Both TNFRSF1B (TNFR80) and TNFR60 are required for full TNF-α-dependent tissue factor expression in human umbilical vein endothelial cells: selective triggering of either receptor alone partially induces tissue factor, but simultaneous activation of both is required for complete induction; membrane TNF-α drives synergistic signaling through both receptor types.\",\n      \"method\": \"Antagonistic and agonistic receptor-specific antibodies; coculture with cells expressing non-cleavable membrane TNF; tissue factor production assay in HUVECs\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (blocking antibodies, agonistic antibodies, membrane TNF coculture) in the same study with quantitative functional readout\",\n      \"pmids\": [\"7544644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TNFRSF1B (TNFR80/CD120b) is the primary signal-transducing receptor for TNF-mediated activation of NK cell cytotoxic function: purified NK cells (CD56+CD3−) express TNFR80 but not TNFR60; anti-TNFR80 antibody mimics TNF in enhancing NK cytotoxicity and, in combination with IL-2, supports lymphokine-activated killer development, whereas only anti-TNFR80 (not anti-TNFR60) abrogates IL-2-induced LAK activity.\",\n      \"method\": \"Monoclonal antibody-mediated receptor-specific ligation and blockade; NK cytotoxicity assays on K562 targets; flow cytometry; LAK cell assays\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — receptor-specific antibody gain- and loss-of-function experiments with quantitative cytotoxicity readouts in primary NK cells\",\n      \"pmids\": [\"7543923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"TNFRSF1B (CD120b/p75) cooperates with CD120a (p55) to regulate nitric oxide and iNOS expression in mouse macrophages: CD120a ligation alone is necessary and sufficient for transient iNOS mRNA and NO production, but co-ligation of CD120b markedly prolongs iNOS mRNA and protein expression and potentiates NO accumulation, likely by acting as a 'ligand-passer' to CD120a and initiating an additional sustained signaling event.\",\n      \"method\": \"Antibody-mediated specific cross-linking of each receptor; iNOS mRNA quantification; NO2− measurement; iNOS protein western blot; blocking antibodies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (receptor cross-linking, blocking antibodies, mRNA, protein, metabolite readouts) establishing both necessity and sufficiency of each receptor's contribution\",\n      \"pmids\": [\"9712914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CD40-induced TNF-α secretion by B cells subsequently signals through TNFRSF1B (CD120b) to enhance IgM secretion; TRAF2 is required for CD120b-mediated IgM production, but TRAF2-dependent CD40 signals cannot substitute for TRAF2-dependent CD120b signals in this response, indicating distinct TRAF2 utilization by the two receptors.\",\n      \"method\": \"Dominant-negative TRAF2 overexpression; TRAF2-deficient B cells; anti-TNF blocking antibodies; IgM ELISA; CH12.LX B cell line\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic (TRAF2 knockout) and dominant-negative approaches with defined functional readout, replicated across two orthogonal perturbation strategies\",\n      \"pmids\": [\"11907088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CD40 and TNFRSF1B (CD120b) use primarily divergent mechanisms to activate NF-κB, but both partially require TRAF2 for IgM secretion; only CD40 (not CD120b) requires TRAF2 for JNK (c-Jun N-terminal kinase) activation, demonstrating that these two TNFR family members use distinct TRAF2-dependent pathways to mediate overlapping downstream events.\",\n      \"method\": \"Wild-type and TRAF2-deficient B cells expressing CD40 or hybrid CD40-CD120b molecules; NF-κB reporter assays; JNK kinase assay; IgM ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — TRAF2-deficient genetic model combined with chimeric receptor constructs and multiple pathway readouts in a single rigorous study\",\n      \"pmids\": [\"15485859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The intracellular domain of TNFRSF1B (TNFR80) promotes noncovalent self-aggregation of soluble receptor forms, which lowers the TNF off-rate and markedly increases TNF-neutralizing capacity compared to the monomeric extracellular domain alone.\",\n      \"method\": \"Production of multiple soluble TNFR80 constructs in insect cells; surface plasmon resonance (ligand off-rate kinetics); TNF bioactivity neutralization assays\",\n      \"journal\": \"Journal of interferon & cytokine research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with surface plasmon resonance kinetic measurements and functional neutralization assay; single lab but two orthogonal methods\",\n      \"pmids\": [\"8807502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Elastase is the serine protease responsible for constitutive shedding of TNFRSF1B (TNF-R75) from resting human neutrophils, generating a 28-kDa receptor fragment; upon stimulation (TNF or fMLP), a metalloprotease additionally contributes to shedding and generates a 40-kDa fragment.\",\n      \"method\": \"Selective serine protease inhibitors (DFP, elastase-specific inhibitors, α1-protease inhibitor) and metalloprotease inhibitors; western blot detection of shed receptor fragments from neutrophil supernatants\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzyme inhibition with multiple mechanistically distinct inhibitors, direct biochemical identification of shed fragment size; single lab but orthogonal inhibitor panel\",\n      \"pmids\": [\"14572651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TNFRSF1B is the primary driver of necroptosis in γ-irradiated peripheral blood mononuclear cells (PBMCs), most likely via membrane-bound TNF-α signaling; necroptosis (but not apoptosis) is required for the pro-angiogenic activity of the PBMC secretome.\",\n      \"method\": \"Necroptosis inhibition experiments; TNFRSF1B identification from transcriptome analysis; scanning electron microscopy and image stream analysis of cell death morphology; aortic ring angiogenesis assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mechanistic identification via transcriptomics with functional necroptosis inhibition validation, single lab\",\n      \"pmids\": [\"31570701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LncRNA NEAT1 stabilizes TNFRSF1B mRNA (demonstrated by RNA pulldown co-precipitation and RNA decay assay), increasing TNFRSF1B protein levels, which in turn promotes NF-κB p65 nuclear translocation and downstream inflammatory cytokine (IL-8, MCP-1) expression in intestinal epithelial cells stimulated with TNF-α.\",\n      \"method\": \"RNA pulldown assay; RNA decay assay; siRNA knockdown and overexpression; western blot for TNFRSF1B and NF-κB p65; immunofluorescence for p65 translocation; ELISA for cytokines\",\n      \"journal\": \"Annals of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pulldown plus decay assay plus rescue experiments; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34268386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Galactosylceramide (GalCer) suppresses TNFRSF1B promoter activity and gene expression in breast cancer cells via a P53-dependent mechanism: cells with high GalCer express lower P53, and siRNA-mediated P53 knockdown phenocopies GalCer in reducing TNFRSF1B expression and promoter activity, linking GalCer-driven P53 suppression to downregulation of TNFRSF1B transcription.\",\n      \"method\": \"Promoter-luciferase reporter assays; siRNA knockdown of P53; western blot and RT-qPCR for TNFRSF1B expression in MDA-MB-231 and MCF7 cells with high vs. no GalCer\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay plus siRNA epistasis experiment in two cell lines; single lab\",\n      \"pmids\": [\"38254878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TNF-α inhibits chondrogenic differentiation of human adipose-derived stem cells by signaling through TNFRSF1B (TNFR2) to upregulate RELA (NF-κB p65) expression, which in turn increases OPA1 expression and promotes mitochondrial fusion.\",\n      \"method\": \"Gene microarray and RT-qPCR; western blot for TNFRSF1B, RELA, OPA1; Alcian blue and Sirius red staining for chondrogenesis; fluorescent mitochondrial imaging\",\n      \"journal\": \"Journal of orthopaedic surgery and research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlative gene expression profiling with some protein validation; no direct knockdown/rescue of TNFRSF1B to establish causal chain; single lab\",\n      \"pmids\": [\"37312126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TNFRSF1B (TNFR2) knockout in K562 cells produces distinct transcriptional profiles from TNFR1 knockout following TNF-α stimulation, with altered regulation of pathways associated with inflammation, apoptosis, and cell proliferation, demonstrating non-redundant roles of the two receptors in TNF-α-induced transcriptional responses.\",\n      \"method\": \"CRISPR knockout of TNFRSF1A and TNFRSF1B in K562 cells; RNA-seq transcriptome profiling after TNF-α stimulation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean CRISPR knockout with genome-wide transcriptional readout; single lab\",\n      \"pmids\": [\"38138998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TNFRSF1B signaling blockade (siRNA knockdown or anti-TNF biologic etanercept blocking LTα3-TNFR2 axis) protects airway epithelial cells from oxidative stress-induced death; lymphotoxin-α (LTA) is overexpressed in airway epithelial cells under oxidative stress and serves as the relevant ligand activating TNFRSF1B in this context.\",\n      \"method\": \"siRNA knockdown of TNFRSF1B in CF submucosal gland cells; etanercept treatment; cell viability assays under oxidative stress; bioinformatic RNAi screen analysis\",\n      \"journal\": \"Antioxidants\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — siRNA knockdown with functional viability readout plus pharmacological validation with etanercept; single lab\",\n      \"pmids\": [\"38539900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Selective ablation of TNFRSF1B (TNFR2) in astrocytes (GfapcreERT2:Tnfrsf1bfl/fl mice) impairs hippocampal long-term potentiation (LTP), disrupts expression of synaptic proteins (SNARE complex molecules, glutamate receptor subunits, glutamate transporters), increases glial reactivity, impairs astrocyte calcium dynamics, and causes cognitive deficits, with more pronounced effects in males than females.\",\n      \"method\": \"Conditional astrocyte-specific TNFR2 knockout mice; electrophysiology (LTP); behavioral cognitive assays; astrocyte RNA-seq; calcium imaging; immunostaining for synaptic and glial markers\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional knockout with multiple orthogonal functional readouts (electrophysiology, behavior, transcriptomics, calcium imaging); preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Tnfrsf1b knockout in zebrafish increases susceptibility to Klebsiella pneumoniae infection with elevated malformation/mortality, increased macrophage and neutrophil recruitment, and elevated pro-inflammatory cytokines (TNF-α, IL-1β); rescue by mRNA injection and overexpression in wild-type confers protection, establishing a protective role for tnfrsf1b in host defense.\",\n      \"method\": \"CRISPR/Cas9 tnfrsf1b knockout zebrafish; K. pneumoniae infection model; mRNA rescue injection; TNFR inhibitor (R7050) pharmacological blockade; qRT-PCR and ELISA for cytokines; immune cell staining\",\n      \"journal\": \"Infection and drug resistance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus mRNA rescue plus pharmacological inhibition in zebrafish ortholog; multiple orthogonal approaches; single lab\",\n      \"pmids\": [\"41170162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human TNFRSF1B gene spans ~43 kbp, consists of 10 exons and 9 introns, and its 5'-flanking promoter region contains consensus binding elements for transcription factors including T cell factor-1, Ikaros, AP-1, NF-κB, Sp1, IL-6RE, ISRE, GAS, and CK-2, consistent with regulated expression in hematopoietic cells.\",\n      \"method\": \"Genomic library screening; restriction mapping; DNA sequencing; promoter sequence analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complete gene structure determination with direct sequencing; single lab but comprehensive structural characterization\",\n      \"pmids\": [\"8702885\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TNFRSF1B (TNFR2/p75/CD120b) is a type I transmembrane TNF receptor that signals primarily through TRAF2 recruitment; it functions as a co-receptor that cooperates with TNFR1 (TNFR60) to regulate cell death, NF-κB activation, JNK signaling, and iNOS/nitric oxide production, while also transducing distinct TRAF2-dependent signals for B cell IgM secretion and NK cell cytotoxic activation; its extracellular domain is shed from cell surfaces by elastase (resting cells) and a metalloprotease (stimulated cells) to generate soluble decoy receptor; in astrocytes it is required for normal hippocampal synaptic plasticity and LTP; and it mediates necroptosis downstream of membrane-bound TNF-α in irradiated PBMCs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TNFRSF1B (TNFR2/TNFR80/CD120b/p75) is a TNF receptor that operates largely as a cooperative, signal-modulating partner of TNFR1 (TNFR60), shaping cellular responses to TNF-\\u03b1 across cell death, inflammation, and immune activation [#1, #2]. Its signaling depends on TRAF2: by recruiting and depleting functional TRAF2, TNFR2 co-stimulation removes TRAF2-dependent anti-apoptotic protection and selectively enhances TNFR1-induced cell death, a cross-talk specific to the TNFR1 pathway [#0]. TNFR2 preferentially responds to membrane-bound rather than soluble TNF, and this membrane-TNF-driven cooperative signaling redirects T-cell responses toward apoptosis [#1], drives full tissue-factor induction in endothelial cells [#2], and prolongs iNOS expression and nitric oxide output in macrophages by acting in concert with TNFR1 [#4]. Beyond cooperation with TNFR1, TNFR2 transduces distinct TRAF2-dependent signals: it is the primary signal-transducing receptor for TNF-mediated NK-cell cytotoxic activation [#3], and it drives B-cell IgM secretion through a TRAF2 requirement that is non-interchangeable with CD40-derived TRAF2 signals, while diverging from CD40 in its NF-\\u03baB and JNK pathway usage [#5, #6]. CRISPR knockout studies confirm that TNFR2 governs a transcriptional program distinct and non-redundant from TNFR1 [#13]. TNFR2 mediates necroptosis in irradiated PBMCs downstream of membrane TNF-\\u03b1 [#9], and is required in astrocytes for normal hippocampal long-term potentiation, synaptic protein expression, and astrocyte calcium dynamics [#15]. The receptor's extracellular domain is shed to generate soluble TNF-neutralizing decoy receptor, with elastase mediating constitutive shedding from resting neutrophils and a metalloprotease contributing additional shedding upon stimulation [#8]; self-aggregation conferred by the intracellular domain lowers the TNF off-rate and enhances neutralizing capacity of soluble receptor forms [#7]. TNFRSF1B expression is itself regulated post-transcriptionally by lncRNA NEAT1, which stabilizes its mRNA to amplify NF-\\u03baB-driven inflammatory cytokine output [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that TNFR2 is not redundant with TNFR1 but cooperates with it, since full induction of endothelial tissue factor required simultaneous triggering of both receptors via membrane TNF.\",\n      \"evidence\": \"Receptor-specific agonistic/antagonistic antibodies and membrane-TNF coculture with tissue factor readout in HUVECs\",\n      \"pmids\": [\"7544644\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the intracellular signaling adaptors mediating TNFR2's contribution\", \"Mechanism of synergy at the receptor level unresolved\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identified TNFR2 as the dominant signal-transducing receptor for TNF-driven NK cytotoxicity, since NK cells express TNFR2 but not TNFR1 and only anti-TNFR2 abrogated IL-2-induced LAK activity.\",\n      \"evidence\": \"Receptor-specific antibody ligation/blockade and cytotoxicity assays in primary NK cells\",\n      \"pmids\": [\"7543923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling pathway for cytotoxic activation not mapped\", \"No molecular link to specific effector machinery\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Characterized the gene architecture and promoter, revealing transcription-factor elements consistent with regulated hematopoietic expression.\",\n      \"evidence\": \"Genomic library screening, restriction mapping, and promoter sequence analysis\",\n      \"pmids\": [\"8702885\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional activity of individual promoter elements not tested\", \"No link to specific physiological transcriptional regulators\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Showed that the intracellular domain drives self-aggregation of soluble receptor forms, explaining how shed/soluble TNFR2 achieves potent TNF neutralization by lowering the ligand off-rate.\",\n      \"evidence\": \"Soluble TNFR2 constructs expressed in insect cells with SPR kinetics and TNF neutralization assays\",\n      \"pmids\": [\"8807502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of aggregation not resolved\", \"Relevance to membrane receptor signaling not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrated that membrane-bound but not soluble TNF engages TNFR2 to cooperatively shift infected T-cell fate toward apoptosis, defining TNFR2 as a modulator of TNF responsiveness.\",\n      \"evidence\": \"Receptor-specific antibodies and non-cleavable membrane-TNF coculture with HIV production and death readouts in T cells and primary lymphocytes\",\n      \"pmids\": [\"8996244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of membrane-TNF preference not defined\", \"Adaptor-level mechanism not established\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Provided the molecular mechanism for TNFR2/TNFR1 cross-talk: TNFR2 depletes functional TRAF2 to abolish anti-apoptotic signaling and selectively enhance TNFR1-induced death.\",\n      \"evidence\": \"Wild-type and dominant-negative TRAF2 overexpression with JNK and cell-death assays in HeLa cells\",\n      \"pmids\": [\"9743381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative dynamics of TRAF2 depletion in primary cells not addressed\", \"Did not test whether other TRAF members participate\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined TNFR2 as a 'ligand-passer' that prolongs and potentiates TNFR1-driven iNOS/NO output rather than acting alone.\",\n      \"evidence\": \"Receptor-specific cross-linking and blocking antibodies with iNOS mRNA/protein and nitrite readouts in mouse macrophages\",\n      \"pmids\": [\"9712914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The additional sustained signaling event downstream of TNFR2 was not molecularly identified\", \"Relationship to TRAF2 not tested in this system\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved how TNFR2 uses TRAF2 distinctly from CD40, showing partial TRAF2 dependence for IgM secretion but, unlike CD40, no TRAF2 requirement for JNK activation.\",\n      \"evidence\": \"TRAF2-deficient and dominant-negative B cells with chimeric CD40-CD120b receptors and NF-\\u03baB/JNK/IgM readouts\",\n      \"pmids\": [\"11907088\", \"15485859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Non-TRAF2 adaptors mediating divergent NF-\\u03baB activation not identified\", \"Mechanism rendering CD40-TRAF2 non-substitutable for TNFR2-TRAF2 unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated TNFR2 as the primary driver of necroptosis in irradiated PBMCs via membrane TNF-\\u03b1, linking this death modality to the secretome's pro-angiogenic activity.\",\n      \"evidence\": \"Transcriptome identification with necroptosis inhibition, cell-death morphology imaging, and aortic ring angiogenesis assay\",\n      \"pmids\": [\"31570701\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Membrane-TNF involvement inferred rather than directly demonstrated\", \"Necroptotic signaling components downstream of TNFR2 not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified post-transcriptional control of TNFRSF1B by lncRNA NEAT1, which stabilizes its mRNA to amplify NF-\\u03baB-driven inflammatory cytokine production.\",\n      \"evidence\": \"RNA pulldown, RNA decay assays, knockdown/overexpression, and p65 translocation readouts in intestinal epithelial cells\",\n      \"pmids\": [\"34268386\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct NEAT1-TNFRSF1B mRNA binding site not mapped\", \"In vivo relevance not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Confirmed via clean genetic ablation that TNFR2 and TNFR1 drive non-redundant transcriptional programs in response to TNF-\\u03b1.\",\n      \"evidence\": \"CRISPR knockout of TNFRSF1A and TNFRSF1B in K562 cells with RNA-seq after TNF-\\u03b1 stimulation\",\n      \"pmids\": [\"38138998\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor-specific transcription factors driving divergence not pinned down\", \"Single cell-line context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended TNFR2 function into oxidative-stress contexts, showing its blockade protects airway epithelial cells via an LT\\u03b1/LT\\u03b13-TNFR2 axis.\",\n      \"evidence\": \"siRNA knockdown and etanercept treatment with viability readouts under oxidative stress in CF gland cells\",\n      \"pmids\": [\"38539900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Death pathway downstream of TNFR2 in this context not defined\", \"LT\\u03b13-TNFR2 binding not directly demonstrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a non-immune, CNS role: astrocytic TNFR2 is required for hippocampal LTP, synaptic protein expression, and astrocyte calcium dynamics, with cognitive consequences.\",\n      \"evidence\": \"Astrocyte-specific conditional TNFR2 knockout mice with electrophysiology, behavior, RNA-seq, and calcium imaging (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Molecular link from TNFR2 to synaptic protein regulation not mechanistically defined\", \"Basis of sex-dependent effects unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a protective host-defense role for the receptor in vivo, since tnfrsf1b knockout zebrafish showed heightened infection susceptibility rescued by mRNA reintroduction.\",\n      \"evidence\": \"CRISPR knockout zebrafish with K. pneumoniae infection, mRNA rescue, and pharmacological TNFR blockade\",\n      \"pmids\": [\"41170162\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signaling pathway underlying protection not mapped\", \"Translatability to mammalian immunity not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TNFR2 ligand engagement (membrane vs soluble TNF, LT\\u03b1) is converted into divergent context-specific outcomes\\u2014cooperative death, NK/B-cell activation, necroptosis, or synaptic support\\u2014through specific adaptor and downstream effector usage remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model linking receptor oligomerization state to signaling output\", \"Full TRAF2-independent adaptor repertoire unknown\", \"Determinants of cell-type-specific outcome selection undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 2, 3, 4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 8]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 3, 5, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 6, 10]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 1, 9]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [13, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TRAF2\", \"TNFRSF1A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}