{"gene":"IL1B","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1984,"finding":"IL1B was cloned from a human monocyte cDNA library and shown to encode a 269 amino acid precursor polypeptide (30,747 Mr); mRNA selected by hybridization to this cDNA was translated in vitro and injected into Xenopus oocytes, which secreted biologically active IL-1β, establishing that the precursor is subsequently processed to the ~15–20 kDa mature form.","method":"cDNA cloning, hybrid-selected translation in reticulocyte lysate, Xenopus oocyte expression, immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — original cloning with functional reconstitution in two independent expression systems","pmids":["6083565"],"is_preprint":false},{"year":1984,"finding":"Murine IL-1 (ortholog of IL1B) was cloned and expressed in E. coli; biological activity was confined to the carboxy-terminal 156 amino acids of the 270 amino acid precursor, defining the minimal bioactive domain of the IL-1β precursor.","method":"cDNA cloning, E. coli expression of truncated constructs, bioassay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — recombinant expression with domain mapping and functional readout","pmids":["6209582"],"is_preprint":false},{"year":1985,"finding":"Two distinct human IL-1 cDNAs (IL-1α and IL-1β) were isolated from a macrophage library; the primary translation products are 271 and 269 amino acids respectively, and expression of the carboxy-terminal 153 amino acids of IL-1β in E. coli produces IL-1 biological activity, confirming the precursor-to-mature processing model.","method":"cDNA library screening, E. coli expression, bioassay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — dual cloning with recombinant expression and functional validation","pmids":["2989698"],"is_preprint":false},{"year":1997,"finding":"MyD88 is recruited to the IL-1 receptor complex upon IL-1 stimulation, physically bridges the receptor heterodimer to IRAK, and its ectopic expression or isolated death domain activates NF-κB; the C-terminus of MyD88 blocks IL-1-induced NF-κB but not TNF-induced NF-κB, placing MyD88 as the immediate IL-1R adapter that recruits IRAK.","method":"Co-immunoprecipitation, ectopic expression, dominant-negative constructs, NF-κB reporter assay","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional epistasis with dominant-negative, replicated concept","pmids":["9430229"],"is_preprint":false},{"year":2000,"finding":"IL-1β-stimulated TRAF6 activates IKK (and thus NF-κB) through the heterodimeric ubiquitin-conjugating enzyme complex Ubc13/Uev1A, which catalyzes synthesis of K63-linked polyubiquitin chains; blockade of this chain synthesis (but not proteasome inhibition) prevents IKK activation downstream of IL-1R signaling.","method":"Protein purification, mass spectrometry, in vitro ubiquitination assay, IKK activation assay, dominant-negative expression","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — biochemical reconstitution with mutagenesis and specific inhibition confirming mechanism","pmids":["11057907"],"is_preprint":false},{"year":2000,"finding":"IL1B promoter polymorphisms (especially the -511 TATA-box variant) that enhance IL-1β production are associated with risk of H. pylori-induced hypochlorhydria and gastric cancer; in vitro EMSA demonstrated that the -31 TATA-box polymorphism markedly alters DNA-protein interactions, providing a molecular mechanism by which the SNP affects transcription.","method":"Case-control genetics, EMSA (electrophoretic mobility shift assay)","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA demonstrating differential protein binding at functional SNP; replicated in multiple populations","pmids":["10746728"],"is_preprint":false},{"year":2001,"finding":"Peripheral inflammation induces widespread Cox-2 expression in spinal cord neurons, elevating cerebrospinal fluid PGE2; the critical inducer of central Cox-2 upregulation is IL-1β acting in the CNS, as intraspinal injection of an IL-1-converting enzyme inhibitor or a Cox-2 inhibitor reduced central PGE2 and mechanical hyperalgesia, placing IL-1β upstream of Cox-2-mediated central sensitization.","method":"In vivo rodent model, intraspinal drug injection, Cox-2 immunostaining, PGE2 measurement, behavioral pain testing","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — pharmacological epistasis in vivo with specific inhibitors, multiple orthogonal readouts","pmids":["11260714"],"is_preprint":false},{"year":2002,"finding":"The inflammasome — a multiprotein complex comprising caspase-1, caspase-5, Pycard/ASC, and NALP1 — was identified as the molecular platform that activates caspase-1 and processes proIL-1β to mature IL-1β; immunodepletion of Pycard in a cell-free system abolished proIL-1β processing, and dominant-negative Pycard blocked proIL-1β maturation in THP-1 cells after LPS stimulation.","method":"Cell-free reconstitution, immunodepletion, dominant-negative expression, caspase activity assay, IL-1β processing assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in cell-free system with immunodepletion and dominant-negative validation; foundational paper (>4900 citations)","pmids":["12191486"],"is_preprint":false},{"year":2002,"finding":"High glucose concentrations induce β-cells themselves (not just immune cells) to produce and release IL-1β, which then activates NF-κB, upregulates Fas, and promotes β-cell apoptosis; the IL-1 receptor antagonist blocked these glucose-induced effects, establishing an autocrine glucotoxic IL-1β loop in human pancreatic islets.","method":"Human islet culture, ELISA, NF-κB reporter, Fas immunostaining, TUNEL apoptosis assay, IL-1Ra blockade, in vivo animal model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in primary human tissue plus in vivo confirmation","pmids":["12235117"],"is_preprint":false},{"year":2003,"finding":"IL-1β upregulates HIF-1α protein under normoxia via an NF-κB/COX-2/PGE2 pathway; the induction involves both new transcription and a post-transcriptional mechanism antagonizing VHL-dependent HIF-1α degradation (increased protein stability), leading to VEGF upregulation and linking inflammation to oncogenesis.","method":"Reporter assay, Western blot, NF-κB inhibition, COX-2 inhibitor treatment, PGE2 addition, HIF-1α stability assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — multiple pathway inhibitors and mechanistic dissection in cell-based system","pmids":["12958148"],"is_preprint":false},{"year":2004,"finding":"NALP3 (with NALP2) associates with ASC, the CARD-containing protein Cardinal, and caspase-1 to form an inflammasome with high proIL-1β-processing activity; macrophages from Muckle-Wells patients (carrying gain-of-function NALP3 mutations) spontaneously secrete active IL-1β, establishing that NALP3-dependent inflammasome activation drives IL-1β maturation.","method":"Co-immunoprecipitation, caspase-1 activity assay, IL-1β processing assay, patient macrophage studies","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1–2 — biochemical complex reconstitution plus pathological validation in patient cells","pmids":["15030775"],"is_preprint":false},{"year":2006,"finding":"P2X7 receptor activation in macrophages leads to IL-1β release via pannexin-1 hemichannels; pannexin-1 mediates the large membrane pore responsible for dye uptake and is required for caspase-1 processing and mature IL-1β release, as siRNA knockdown of pannexin-1 abolished both pore formation and IL-1β secretion induced by P2X7 stimulation.","method":"Electrophysiology, dye uptake assay, siRNA knockdown, caspase-1 processing assay, IL-1β ELISA","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — RNAi with multiple functional readouts demonstrating mechanistic requirement","pmids":["17036048"],"is_preprint":false},{"year":2007,"finding":"Non-tyrosine-phosphorylated (NTP)-Stat1 participates in a constitutive trimolecular complex with Spi-1/PU.1 and IRF8 pre-bound at the LPS/IL-1 response element (LILRE) of the IL1B promoter; LPS induces tyrosine phosphorylation of IRF8 (but not Stat1), which is required for IL1B transactivation. A Y211F IRF8 dominant-negative abrogated LPS-induced IL1B reporter activity, and ectopic NTP-Stat1 Y701F enhanced it.","method":"Chromatin immunoprecipitation, EMSA, reporter assay, site-directed mutagenesis, dominant-negative expression, in vitro DNA binding with recombinant proteins","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP, EMSA with recombinant proteins, and mutagenesis converging on the same mechanism","pmids":["17386941"],"is_preprint":false},{"year":2007,"finding":"The IL1B -31 T/C SNP differentially regulates promoter activity: the T variant drives higher transcription than the C variant in lung epithelial A549 cells. EMSA revealed a unique protein complex on the C allele not present on the T allele; supershift identified C/EBPβ and TBP as components of this complex, explaining allele-specific differences in IL1B expression.","method":"Luciferase reporter assay, EMSA, supershift assay","journal":"Cytokine","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay plus EMSA/supershift, single lab","pmids":["17587593"],"is_preprint":false},{"year":2008,"finding":"Intracellular HMGB1 physically interacts with the Ets transcription factor PU.1 (Spi-1) and co-operates with it to transactivate the IL1B promoter. GST pulldown and co-immunoprecipitation demonstrated direct HMGB1-PU.1 interaction; EMSA showed a ternary complex of PU.1, HMGB1, and the PU.1-binding element in the IL1B promoter. Deletion of the PU.1 winged helix-turn-helix domain abolished the interaction.","method":"GST pulldown, co-immunoprecipitation, EMSA, reporter assay, domain deletion mutagenesis","journal":"European journal of haematology","confidence":"High","confidence_rationale":"Tier 1–2 — GST pulldown, Co-IP, and EMSA all confirm direct physical interaction with domain mapping","pmids":["18173740"],"is_preprint":false},{"year":2009,"finding":"AIM2, identified by crossing a proteomic screen for DNA-binding proteins with interferon-stimulated gene transcripts, senses cytoplasmic dsDNA, recruits the inflammasome adapter ASC, and is necessary and sufficient for IL-1β maturation: AIM2 knockdown impaired DNA-induced IL-1β processing in THP-1 cells, and reconstitution of HEK293 cells with AIM2, ASC, caspase-1, and proIL-1β was sufficient for inflammasome activation.","method":"Proteomic/genomic screen, Co-immunoprecipitation, RNAi knockdown, HEK293 reconstitution assay, IL-1β processing assay","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution in naive cells plus knockdown, multiple orthogonal methods","pmids":["19158679"],"is_preprint":false},{"year":2009,"finding":"MiR-155 is upregulated by LPS in human monocyte-derived dendritic cells and directly targets TAB2, a signal transduction component of the TLR/IL-1 pathway, forming a negative feedback loop that dampens inflammatory cytokine (including IL-1β) production in response to microbial stimuli.","method":"LNA silencing, microarray, luciferase 3'UTR reporter (target validation), cytokine ELISA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct target validation with reporter assay plus LNA silencing with functional readout","pmids":["19193853"],"is_preprint":false},{"year":2009,"finding":"Human blood monocytes release processed, mature IL-1β after a single TLR2 or TLR4 stimulation due to constitutively activated caspase-1, driven by constitutive NALP3 and ASC activity and autocrine ATP release. In contrast, macrophages require a second ATP stimulus (two-signal requirement) for IL-1β processing, demonstrating cell-type-specific uncoupling of caspase-1 activation from PRR signaling.","method":"IL-1β ELISA, caspase-1 activity assay, NALP3/ASC siRNA knockdown, ATP measurement, pharmacological inhibitors","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — siRNA plus pharmacological inhibition with multiple readouts; replicated across cell types","pmids":["19104081"],"is_preprint":false},{"year":2010,"finding":"The crystal structure of the MyD88-IRAK4-IRAK2 death domain complex revealed a left-handed helical oligomer (Myddosome) comprising 6 MyD88, 4 IRAK4, and 4 IRAK2 DDs; this hierarchical assembly brings IRAK kinase domains into proximity for trans-phosphorylation and activation. Key interface mutations predicted from the structure abrogated signaling, explaining how IL-1R/TLR engagement triggers the IL-1β-driven NF-κB cascade.","method":"X-ray crystallography, site-directed mutagenesis, functional signaling assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with mutagenesis-based functional validation","pmids":["20485341"],"is_preprint":false},{"year":2011,"finding":"IL-1β secretion does not follow the conventional ER-Golgi secretory route; multiple mechanisms contribute on a continuum depending on stimulus strength, including caspase-1-dependent and caspase-1-independent pathways, and extracellular vesicle release, as reviewed from diverse experimental systems.","method":"Review and synthesis of reconstitution, pharmacological, and cell-biological studies","journal":"Cytokine & growth factor reviews","confidence":"Medium","confidence_rationale":"Tier 2/3 — synthesis paper, underlying experimental evidence from multiple labs","pmids":["22019906"],"is_preprint":false},{"year":2012,"finding":"IL-1β is essential for differentiation of Candida albicans-specific human TH17 cells that co-produce IL-17 and IFN-γ; IL-1β counteracts IL-12-mediated inhibition during priming and suppresses IL-10 production in both differentiating and memory TH17 cells. In vivo blockade of IL-1β increased IL-10 production by memory TH17 cells, establishing IL-1β as a directional regulator of TH17 functional polarization.","method":"In vitro naive T-cell priming, cytokine neutralization/blockade, in vivo IL-1β blockade, intracellular cytokine staining, memory T-cell restimulation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — in vitro and in vivo experiments with specific blockade, replicated with antigen-specific cells","pmids":["22466287"],"is_preprint":false},{"year":2013,"finding":"CpG methylation at the -299 bp site in the proximal IL1B promoter strongly suppresses transcriptional activity; in situ methylation analysis of human chondrocytes correlated demethylation of this site with high IL1B expression. Transfection of CpG-free luciferase reporters with site-directed CpG mutants confirmed that methylation of the -299 site is the primary epigenetic switch for IL1B transcription in chondrocytes, operating through a mechanism distinct from HIF-2α (which regulates the adjacent MMP13 promoter -110 CpG).","method":"In situ bisulfite methylation analysis, CpG-free luciferase reporter transfection with site-directed mutagenesis, chromatin immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis in reporter + in situ tissue analysis + ChIP converging on same site","pmids":["23417678"],"is_preprint":false},{"year":2014,"finding":"Caspase-1-mediated pyroptosis, not caspase-3-mediated apoptosis, is the principal death pathway for CD4 T cells during HIV-1 infection in lymphoid tissue; pyroptotic CD4 T cells release IL-1β, linking the two signature events of HIV — CD4 depletion and chronic inflammation. Caspase-1 inhibitors blocked both CD4 T-cell death and IL-1β release.","method":"Primary human lymphoid tissue explants, caspase-1 and caspase-3 activity assays, caspase-1 inhibitor treatment, IL-1β ELISA, flow cytometry","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — pharmacological epistasis with specific caspase inhibitors in primary human tissue","pmids":["24356306"],"is_preprint":false},{"year":2014,"finding":"Autophagy-dependent degradation of PELI3 (Pellino3), an E3 ubiquitin ligase and TLR4-scaffold protein, attenuates Il1b mRNA expression in macrophages; PELI3 is ubiquitinated upon LPS stimulation, binds the autophagy receptor SQSTM1/p62, and colocalizes with LC3B and LAMP2. Mutation of PELI3 lysine-316 (K316R) reduced Torin2-dependent PELI3 degradation, identifying this residue as required for autophagic targeting.","method":"siRNA knockdown (Sqstm1, Atg7), pharmacological autophagy inhibition, proteasome inhibition, immunofluorescence co-localization, ubiquitination assay, site-directed mutagenesis (K316R), qRT-PCR of Il1b","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological tools plus mutagenesis identifying specific ubiquitination site","pmids":["25483963"],"is_preprint":false},{"year":2017,"finding":"PTPN22 loss leads to enhanced NLRP3 phosphorylation, which promotes sequestration of phospho-NLRP3 into autophagosomes, thereby reducing NLRP3 inflammasome activation and IL-1β (IL1B) secretion. Inhibition of autophagy abrogated the inhibitory effect on NLRP3 activation seen in PTPN22-deficient cells, and phosphorylated (but not non-phosphorylated) NLRP3 was found in autophagosomes.","method":"Autophagy inhibition (pharmacological and genetic), NLRP3 phosphorylation analysis, autophagosome fractionation, IL-1β secretion assay","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — genetic and pharmacological autophagy manipulation with fractionation to identify phospho-NLRP3 in autophagosomes","pmids":["28786745"],"is_preprint":false},{"year":2018,"finding":"In CD4 T cells, IL1B gene transcription occurs independently of Spi-1/PU.1 (which is required in monocytes) and proceeds from a bivalent H3K4me3+/H3K27me3+ chromatin state at the IL1B promoter; CD3/CD28 stimulation increases IL1B transcription and translation, and the CCR5+ effector memory subset expresses higher proIL-1β than CCR5- T cells, revealing a lymphoid-specific epigenetic regulatory mechanism.","method":"ChIP for H3K4me3/H3K27me3, qRT-PCR, Western blot, flow cytometry (cell subset comparison), ex vivo CD3/CD28 activation","journal":"Cytokine","confidence":"High","confidence_rationale":"Tier 2 — ChIP demonstrating cell-type-specific bivalent chromatin mark absent in monocytes, with functional transcription data","pmids":["30300855"],"is_preprint":false},{"year":2019,"finding":"SQSTM1-dependent autophagic degradation of PKM2 (pyruvate kinase M2) inhibits production of mature IL-1β in macrophages; LIPUS (low-intensity pulsed ultrasound) upregulates autophagy and promotes SQSTM1-PKM2 complex formation. SQSTM1 knockdown reversed the LIPUS-induced decrease in PKM2 and restoration of mature IL-1β, placing PKM2 as a pro-IL-1β factor whose autophagic clearance limits inflammasome output.","method":"siRNA knockdown, co-immunoprecipitation (SQSTM1-PKM2 complex), Western blot (LC3, Beclin-1, PKM2), ELISA (IL-1β), transmission electron microscopy","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — Co-IP demonstrating complex formation, siRNA epistasis placing SQSTM1 upstream of PKM2 and IL-1β","pmids":["31500508"],"is_preprint":false},{"year":2020,"finding":"IL1B increases intestinal tight junction permeability by upregulating MIR200C-3p, which directly degrades occludin mRNA via its 3'UTR; 3D molecular modeling and mutational analyses identified the specific nucleotide bases of the occludin mRNA 3'UTR that interact with MIR200C-3p, and antagomiR-200C prevented IL1B-induced decrease in occludin and the increase in TJ permeability both in vitro and in vivo.","method":"miRNA reporter assay, immunoblot, qRT-PCR, transfection with miRNA vectors, antagomiR treatment, intestinal perfusion in vivo, 3D molecular modeling with mutational analysis","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — mechanistic pathway confirmed by gain- and loss-of-function in vitro and in vivo with mutational mapping of the miRNA-mRNA interaction site","pmids":["32569770"],"is_preprint":false},{"year":2009,"finding":"The IL1B -31 polymorphism-driven differential expression of IL-1β modulates gastrin expression at the transcriptional level via NF-κB and HDACs; the -31T IL1B variant drives ~10-fold higher promoter activity than -31C, and IL1B (induced by -31T) represses gastrin promoter activity ~2-fold more than -31C-driven IL1B, with ~1.5-fold greater NF-κB activation.","method":"Promoter-reporter transfection, IL1B expression plasmids with allelic variants, NF-κB reporter assay, HDAC inhibitor experiments, gastrin ELISA","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay with allele-specific constructs in cell-based system; single lab","pmids":["19166966"],"is_preprint":false}],"current_model":"IL1B encodes a 269-amino-acid precursor (proIL-1β) that is cleaved to mature 17 kDa IL-1β primarily by caspase-1 activated within multiprotein inflammasome complexes (NALP1/NALP3/AIM2 platforms containing ASC and caspase-1); upstream, IL-1R ligation recruits MyD88, which assembles a helical Myddosome with IRAK4 and IRAK2, activating TRAF6 to synthesize K63-polyubiquitin chains that activate IKK/NF-κB; IL1B gene transcription is governed in myeloid cells by a pre-bound Spi-1/PU.1–IRF8–NTP-Stat1 complex at the LILRE enhancer (with IRF8 phosphorylation as the LPS-inducible trigger) and in CD4 T cells by a bivalent H3K4me3+/H3K27me3+ chromatin state independent of PU.1, while epigenetic control via CpG methylation at the -299 promoter site and post-transcriptional regulation via miR-155 (targeting TAB2) and autophagy-dependent degradation of PELI3 and PKM2 further tune IL-1β output; secreted IL-1β drives downstream effectors including Cox-2/PGE2 in the CNS (mediating central pain sensitization), HIF-1α stabilization (linking inflammation to angiogenesis/oncogenesis), and TH17 cell polarization, and also acts in a glucotoxic autocrine loop in pancreatic β-cells."},"narrative":{"teleology":[{"year":1984,"claim":"Cloning of human and murine IL-1β cDNAs established that IL1B encodes a precursor polypeptide whose carboxy-terminal ~153–156 residues constitute the biologically active mature cytokine, resolving the molecular identity and domain organization of IL-1β.","evidence":"cDNA cloning from monocyte/macrophage libraries, E. coli expression of truncation constructs, Xenopus oocyte translation, and bioassay","pmids":["6083565","6209582","2989698"],"confidence":"High","gaps":["Mechanism of precursor cleavage unknown at this point","Signal-less secretion pathway uncharacterized","No structural information on mature IL-1β"]},{"year":1997,"claim":"Identification of MyD88 as the IL-1R-proximal adaptor that bridges receptor engagement to IRAK recruitment answered how IL-1β transduces signal from the plasma membrane to the NF-κB cascade.","evidence":"Co-immunoprecipitation, dominant-negative death domain constructs, NF-κB reporter assays showing IL-1-specific but not TNF-specific blockade","pmids":["9430229"],"confidence":"High","gaps":["Stoichiometry and oligomeric state of the signaling complex unknown","How IRAK activates downstream kinases not yet resolved"]},{"year":2000,"claim":"Demonstration that TRAF6 activates IKK through Ubc13/Uev1A-catalyzed K63-linked polyubiquitin chains completed the biochemical link between IL-1R engagement and NF-κB activation, establishing a non-degradative ubiquitin signaling paradigm downstream of IL-1β.","evidence":"Biochemical reconstitution with purified proteins, mass spectrometry identification of Ubc13/Uev1A, in vitro IKK activation assay, dominant-negative blockade","pmids":["11057907"],"confidence":"High","gaps":["K63-chain deubiquitinase regulation not identified","Exact chain attachment sites on TRAF6 substrates unresolved"]},{"year":2002,"claim":"Discovery of the inflammasome as a multiprotein complex (NALP1/ASC/caspase-1/caspase-5) that activates caspase-1 to process proIL-1β resolved the long-standing question of how the leaderless precursor is matured, establishing the two-signal model of IL-1β production.","evidence":"Cell-free reconstitution, immunodepletion of ASC abolishing processing, dominant-negative ASC in THP-1 cells","pmids":["12191486"],"confidence":"High","gaps":["Upstream danger signals that trigger assembly unknown","Other NLR sensor proteins not yet identified"]},{"year":2002,"claim":"The finding that high glucose induces β-cells themselves to produce IL-1β in an autocrine loop that drives NF-κB activation, Fas upregulation, and apoptosis established a non-immune-cell source and pathogenic function of IL-1β in type 2 diabetes glucotoxicity.","evidence":"Human islet culture, ELISA, NF-κB reporter, TUNEL, IL-1Ra blockade, in vivo model","pmids":["12235117"],"confidence":"High","gaps":["Mechanism of proIL-1β processing in β-cells (caspase-1-dependent or alternative) not defined","Whether IL-1Ra therapy rescues β-cell mass in vivo not fully resolved"]},{"year":2003,"claim":"IL-1β was shown to stabilize HIF-1α under normoxia through an NF-κB/COX-2/PGE2 pathway that antagonizes VHL-dependent degradation, providing a molecular link between inflammation, angiogenesis, and oncogenesis.","evidence":"Reporter assays, Western blot, COX-2 and NF-κB inhibitor epistasis, HIF-1α protein stability measurements","pmids":["12958148"],"confidence":"High","gaps":["Precise post-translational modification on HIF-1α affected by PGE2 unknown","In vivo relevance to tumor angiogenesis not demonstrated"]},{"year":2004,"claim":"Identification of NALP3 as a second inflammasome sensor, with gain-of-function mutations in Muckle-Wells patients causing spontaneous IL-1β release, expanded the inflammasome concept and connected IL-1β to autoinflammatory disease.","evidence":"Co-immunoprecipitation of NALP3/ASC/Cardinal/caspase-1 complex, caspase-1 activity assay, patient macrophage studies","pmids":["15030775"],"confidence":"High","gaps":["Molecular triggers for NALP3 activation not identified","How NALP3 mutations bypass the two-signal requirement unclear"]},{"year":2006,"claim":"Pannexin-1 hemichannels were identified as required for P2X7-triggered caspase-1 processing and IL-1β release, addressing how the second signal (extracellular ATP) mechanistically couples to inflammasome activation.","evidence":"Pannexin-1 siRNA knockdown abolishing both membrane pore formation and IL-1β secretion, electrophysiology, dye uptake assay","pmids":["17036048"],"confidence":"High","gaps":["Whether pannexin-1 is universally required for all inflammasome activators or is P2X7-specific","Physical interaction between pannexin-1 and inflammasome components not shown"]},{"year":2007,"claim":"Characterization of the PU.1–IRF8–NTP-Stat1 trimolecular complex pre-bound at the LILRE enhancer, with LPS-induced IRF8 tyrosine phosphorylation as the activating switch, defined the myeloid-specific transcriptional mechanism governing IL1B induction.","evidence":"ChIP, EMSA with recombinant proteins, reporter assay, IRF8 Y211F dominant-negative mutagenesis","pmids":["17386941"],"confidence":"High","gaps":["Kinase responsible for IRF8 Y211 phosphorylation not identified","Whether this enhancer mechanism operates in all myeloid subsets unknown"]},{"year":2009,"claim":"Multiple advances in 2009 refined IL-1β regulation: AIM2 was identified as a cytoplasmic dsDNA sensor forming a third inflammasome platform for IL-1β processing; miR-155 was shown to dampen IL-1β output by targeting TAB2 in a negative feedback loop; and human monocytes were found to constitutively activate caspase-1 requiring only one signal for IL-1β release, unlike macrophages.","evidence":"AIM2: proteomic/genomic screen, HEK293 reconstitution, RNAi; miR-155: 3'UTR reporter validation, LNA silencing, cytokine ELISA; monocyte: NALP3/ASC siRNA, ATP measurement, caspase-1 activity","pmids":["19158679","19193853","19104081"],"confidence":"High","gaps":["AIM2 ligand length and sequence requirements not defined","Mechanism of constitutive caspase-1 activation in monocytes unclear","miR-155 contribution relative to other post-transcriptional regulators not quantified"]},{"year":2010,"claim":"The crystal structure of the MyD88–IRAK4–IRAK2 Myddosome revealed a left-handed helical 6:4:4 death domain oligomer, explaining how IL-1R engagement nucleates IRAK kinase trans-phosphorylation and resolving the stoichiometric basis of signal amplification.","evidence":"X-ray crystallography, interface mutagenesis with functional signaling assays","pmids":["20485341"],"confidence":"High","gaps":["How Myddosome disassembly is regulated not addressed","Whether other IRAKs substitute in specific cell types unclear"]},{"year":2012,"claim":"IL-1β was established as essential for human TH17 cell differentiation and functional polarization, counteracting IL-12 and suppressing IL-10 in both naive and memory TH17 cells, thereby extending IL-1β's role from innate immunity to adaptive immune programming.","evidence":"In vitro naive T-cell priming, in vivo IL-1β blockade, intracellular cytokine staining across antigen-specific and memory subsets","pmids":["22466287"],"confidence":"High","gaps":["Transcription factors downstream of IL-1R in T cells mediating IL-10 suppression not identified","Whether IL-1β requirement is pathogen-specific beyond Candida not tested"]},{"year":2013,"claim":"CpG methylation at the −299 site was identified as the primary epigenetic switch controlling IL1B transcription, with demethylation correlating with high expression in human chondrocytes, adding a DNA methylation layer to the transcriptional regulation previously attributed to transcription factors alone.","evidence":"Bisulfite sequencing in situ, CpG-free reporter with site-directed methylation mutants, ChIP","pmids":["23417678"],"confidence":"High","gaps":["Demethylase responsible for −299 CpG demethylation not identified","Whether this site is the dominant switch in other tissues unknown"]},{"year":2014,"claim":"Two discoveries in 2014 expanded IL-1β biology: caspase-1-dependent pyroptosis was identified as the principal CD4 T-cell death pathway during HIV-1 infection with concomitant IL-1β release linking depletion to chronic inflammation, and autophagy-dependent degradation of the E3 ligase PELI3 was shown to dampen Il1b mRNA expression.","evidence":"HIV: caspase-1 inhibitors in primary human lymphoid explants blocking both CD4 death and IL-1β release; PELI3: siRNA, autophagy inhibition, ubiquitination assay, K316R mutagenesis","pmids":["24356306","25483963"],"confidence":"High","gaps":["Whether caspase-1 inhibition can reduce HIV-induced inflammation in vivo clinically unknown","PELI3 substrates relevant to Il1b transcription not identified"]},{"year":2018,"claim":"Discovery that CD4 T cells activate IL1B transcription from a bivalent H3K4me3+/H3K27me3+ chromatin state independently of PU.1 revealed a lymphoid-specific epigenetic regulatory mechanism fundamentally different from the myeloid PU.1–IRF8 pathway.","evidence":"ChIP for bivalent histone marks, qRT-PCR, Western blot, flow cytometry comparing CCR5+ vs CCR5− subsets","pmids":["30300855"],"confidence":"High","gaps":["Transcription factor that replaces PU.1 in T cells not identified","Stimulus that resolves the bivalent state not defined"]},{"year":2020,"claim":"IL-1β was shown to disrupt intestinal tight junctions by upregulating miR-200c-3p, which degrades occludin mRNA, establishing a miRNA-mediated mechanism by which IL-1β increases epithelial barrier permeability.","evidence":"miRNA reporter assay, antagomiR rescue in vitro and in vivo intestinal perfusion, mutational mapping of miRNA-mRNA interaction site","pmids":["32569770"],"confidence":"High","gaps":["Whether other tight junction proteins are co-regulated by the same miRNA not tested","Relevance to IBD barrier dysfunction in patients not demonstrated"]},{"year":null,"claim":"Key unresolved questions include the identity of the kinase phosphorylating IRF8 at Y211 to trigger myeloid IL1B transcription, the transcription factor substituting for PU.1 in T-cell IL1B expression, the structural basis of NALP3 activation and the molecular triggers that distinguish sterile from microbial inflammasome assembly, and the relative contributions of multiple unconventional secretion routes for leaderless IL-1β in different physiological contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["IRF8 Y211 kinase identity unknown","T-cell-specific IL1B transcription factor unidentified","Structural mechanism of NLRP3 activation incompletely resolved","Quantitative comparison of unconventional secretion pathways lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,2,6,8,9,20,27]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,7,10,11,17,19]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,10,22]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4,7,10,15,17,18,20,22]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4,9,18,27]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,22]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[23,24,26]}],"complexes":["NLRP3 inflammasome","NLRP1 inflammasome","AIM2 inflammasome","Myddosome"],"partners":["CASP1","PYCARD","MYD88","IRAK4","TRAF6","NLRP3","AIM2","IL1R1"],"other_free_text":[]},"mechanistic_narrative":"IL-1β is a master pro-inflammatory cytokine produced as a 269-amino-acid precursor (proIL-1β) that is proteolytically matured to a ~17 kDa secreted form by caspase-1 activated within inflammasome complexes composed of sensor proteins (NALP1, NALP3, or AIM2), the adaptor ASC, and caspase-1 [PMID:12191486, PMID:15030775, PMID:19158679]. IL-1β signals through IL-1R to recruit MyD88, which assembles a helical Myddosome with IRAK4 and IRAK2, culminating in TRAF6-catalyzed K63-polyubiquitin chain synthesis and IKK/NF-κB activation [PMID:9430229, PMID:20485341, PMID:11057907]. Transcription of IL1B is governed in myeloid cells by a constitutive PU.1–IRF8–NTP-Stat1 complex at the LILRE enhancer with LPS-induced IRF8 phosphorylation as the activating trigger, whereas in CD4 T cells a bivalent H3K4me3+/H3K27me3+ chromatin state permits PU.1-independent transcription; CpG methylation at the −299 promoter site serves as an additional epigenetic switch, and autophagy-dependent degradation of PELI3 and PKM2 limits IL-1β output post-transcriptionally [PMID:17386941, PMID:30300855, PMID:23417678, PMID:25483963, PMID:31500508]. Downstream, IL-1β drives Cox-2/PGE2-mediated central pain sensitization, stabilizes HIF-1α to link inflammation to angiogenesis, polarizes TH17 cells, disrupts intestinal tight junctions via miR-200c-3p-mediated occludin degradation, and operates in an autocrine glucotoxic loop that promotes pancreatic β-cell apoptosis [PMID:11260714, PMID:12958148, PMID:22466287, PMID:32569770, PMID:12235117]."},"prefetch_data":{"uniprot":{"accession":"P01584","full_name":"Interleukin-1 beta","aliases":["Catabolin"],"length_aa":269,"mass_kda":30.7,"function":"Potent pro-inflammatory cytokine (PubMed:10653850, PubMed:12794819, PubMed:28331908, PubMed:3920526). Initially discovered as the major endogenous pyrogen, induces prostaglandin synthesis, neutrophil influx and activation, T-cell activation and cytokine production, B-cell activation and antibody production, and fibroblast proliferation and collagen production (PubMed:3920526). Promotes Th17 differentiation of T-cells. 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PERIPHERAL NEUROPATHY; IMD133","url":"https://www.omim.org/entry/621254"},{"mim_id":"621233","title":"IMMUNODYSREGULATION WITH VARIABLE IMMUNODEFICIENCY AND AUTOIMMUNITY; IMDIA","url":"https://www.omim.org/entry/621233"},{"mim_id":"621228","title":"LONG INTERGENIC NONCODING RNA 1013; LINC01013","url":"https://www.omim.org/entry/621228"},{"mim_id":"621030","title":"AUTOINFLAMMATION, PANNICULITIS, AND DERMATOSIS SYNDROME, AUTOSOMAL DOMINANT; AIPDSA","url":"https://www.omim.org/entry/621030"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":190.0},{"tissue":"urinary 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Institute","url":"https://pubmed.ncbi.nlm.nih.gov/12441323","citation_count":492,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":57408,"output_tokens":4988,"usd":0.123522},"stage2":{"model":"claude-opus-4-6","input_tokens":8598,"output_tokens":3905,"usd":0.210923},"total_usd":0.751478,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":70287,"output_tokens":7561,"usd":0.162138},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":11826,"output_tokens":4432,"usd":0.254895}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"IL-1β increases intestinal tight junction permeability by upregulating MIR200C-3p, which directly degrades occludin mRNA. 3D molecular modeling and mutational analyses identified specific nucleotide bases in the occludin mRNA 3'UTR that interact with MIR200C-3p.\",\n      \"method\": \"Caco-2 monolayer permeability assay, antagomiR transfection, in vivo mouse intestinal perfusion, laser capture microdissection, 3D molecular modeling, mutational analysis\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (in vitro, in vivo, mutagenesis, modeling) in a single study with functional readouts\",\n      \"pmids\": [\"32569770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Phosphorylation of IRF8 at Y211 is critical for LPS-induced IL1B gene transcription. A pre-associated trimolecular complex of Spi-1/PU.1, IRF8, and non-tyrosine-phosphorylated Stat1 (NTP-Stat1) constitutively binds the LPS and IL-1 response element (LILRE) in the IL1B promoter, priming the gene for rapid induction; LPS triggers IRF8 phosphorylation to activate transcription.\",\n      \"method\": \"Chromatin immunoprecipitation, electrophoretic mobility shift assay, site-directed mutagenesis, luciferase reporter assay, in vitro DNA binding with recombinant proteins, co-expression of dominant-negative mutants\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with recombinant proteins, mutagenesis, ChIP, and reporter assays with multiple orthogonal validations\",\n      \"pmids\": [\"17386941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Intracellular HMGB1 physically interacts with the Ets transcription factor PU.1 and enhances its binding to the IL1B promoter, forming a ternary complex (PU.1/HMGB1/DNA) that transactivates the IL1B gene in macrophages/monocytes.\",\n      \"method\": \"GST-pulldown, co-immunoprecipitation, electrophoretic mobility shift assay (EMSA), luciferase reporter assay, transfection into PU.1-deficient cells\",\n      \"journal\": \"European journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct protein-protein interaction confirmed by GST-pulldown and co-IP, functional validation by reporter assay and EMSA with recombinant proteins\",\n      \"pmids\": [\"18173740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IL1B gene transcription in CD4 T cells proceeds independently of the myeloid transcription factor Spi-1/PU.1 and from a bivalent (H3K4me3+/H3K27me3+) promoter, in contrast to monocytes where Spi-1/PU.1 pre-binding drives rapid induction. Accumulated cytoplasmic proIL-1β in T cells can be cleaved to mature IL-1β to regulate T cell polarization.\",\n      \"method\": \"Chromatin immunoprecipitation for histone marks and Spi1 binding, ex vivo CD3/CD28 activation, flow cytometry, quantitative RT-PCR, Western blotting\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with multiple epigenetic marks compared across cell types, functional activation experiments\",\n      \"pmids\": [\"30300855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Demethylation of a specific CpG site at -299 bp in the IL1B proximal promoter in human articular chondrocytes correlates with and is required for IL1B gene expression; inflammatory cytokines (TNFα/OSM) cause near-complete demethylation at this site, enabling IL1B transcription.\",\n      \"method\": \"Bisulfite modification sequencing, methylation-sensitive restriction enzyme assay, quantitative RT-PCR, ELISA for protein secretion, 5-azadeoxycytidine treatment\",\n      \"journal\": \"Arthritis and rheumatism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — bisulfite sequencing plus functional methylation-sensitive enzyme assay with direct correlation to gene expression in primary human cells\",\n      \"pmids\": [\"19877066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Methylation of the -299 bp CpG site in the IL1B proximal promoter suppresses transcriptional activity, as demonstrated by site-directed CpG mutation in a CpG-free luciferase reporter. Unlike MMP13, the -299 CpG in IL1B is not regulated by HIF-2α and must interact with other transcription factors to control IL1B transcription.\",\n      \"method\": \"Site-directed CpG mutagenesis in CpG-free luciferase reporter, transfection in chondrocytes, chromatin immunoprecipitation, in situ methylation analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis in CpG-free reporter with ChIP validation, orthogonal to bisulfite sequencing data\",\n      \"pmids\": [\"23417678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The IL1B -31 T/C promoter SNP differentially binds transcription factors: the C-variant forms a specific protein complex not present on the T-variant, involving CCAAT-enhancer binding protein beta (C/EBPβ/NF-IL6) and TATA-box binding protein (TBP). The T-variant promoter drives higher IL1B expression than the C-variant.\",\n      \"method\": \"Luciferase reporter assay, electrophoretic mobility shift assay (EMSA), supershift experiments with antibodies against C/EBPβ and TBP\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — EMSA with supershift identifies specific transcription factor binding, supported by functional reporter assay\",\n      \"pmids\": [\"17587593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The IL1B -31T allele drives approximately 10-fold higher IL1B promoter activity than the -31C allele, and there is functional interaction between the -511 and -31 polymorphic loci in determining overall promoter strength. Carriers of the -31CC genotype secrete less IL-1β and are more susceptible to H. pylori-associated duodenal ulcers.\",\n      \"method\": \"IL1B promoter activity assay (luciferase reporter), quantitative mucosal IL1B mRNA measurement, genotyping by PCR-RFLP\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional promoter assay with allele-specific constructs correlated with in vivo mRNA levels\",\n      \"pmids\": [\"16550552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PTPN22 regulates NLRP3-mediated IL1B secretion via an autophagy-dependent mechanism: PTPN22 loss leads to increased NLRP3 phosphorylation, which promotes NLRP3 sequestration into autophagosomes, thereby inhibiting NLRP3 inflammasome activation and reducing mature IL-1β secretion.\",\n      \"method\": \"Autophagy inhibition/induction experiments, phosphorylation analysis, autophagosome fractionation, siRNA knockdown of ATG7 and SQSTM1, macrophage inflammasome activation assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic (KO/KD) and pharmacological manipulation of autophagy with defined molecular pathway placement\",\n      \"pmids\": [\"28786745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Autophagy-dependent degradation of the E3 ubiquitin ligase PELI3 (via SQSTM1/p62 as adaptor) attenuates proinflammatory IL1B mRNA expression in LPS-stimulated macrophages. PELI3 ubiquitination at K316 is required for its autophagy-dependent degradation.\",\n      \"method\": \"siRNA knockdown of PELI3, SQSTM1, ATG7; pharmacological autophagy inhibition/induction; point mutagenesis (K316R); immunofluorescence co-localization with LC3B and LAMP2\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis identifies key residue, multiple genetic and pharmacological perturbations with consistent readout\",\n      \"pmids\": [\"25483963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SQSTM1-dependent autophagic degradation of PKM2 inhibits production of mature IL-1β in LPS/ATP-stimulated macrophages. LIPUS promotes SQSTM1-PKM complex formation and reduces PKM2 levels; SQSTM1 knockdown reverses LIPUS-mediated inhibition of IL-1β maturation.\",\n      \"method\": \"Co-immunoprecipitation (SQSTM1-PKM complex), siRNA knockdown of SQSTM1, in vitro macrophage inflammasome activation, in vivo mouse models, Western blotting for autophagy markers\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP demonstrating complex, genetic knockdown with functional rescue, in vivo validation\",\n      \"pmids\": [\"31500508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"IL-1β (acting through IL-1 receptor signaling) inhibits gastrin expression at the transcriptional level through NF-κB activation and HDAC involvement. The -31T IL1B promoter variant drives ~3-fold more IL1B expression than the -31C variant in gastric carcinoma cells, and -31T-derived IL1B causes greater NF-κB activation and greater suppression of gastrin promoter activity.\",\n      \"method\": \"Gastrin promoter luciferase assay, IL1B expression plasmids with allele-specific -31 variants, NF-κB activation measurement, HDAC inhibitor studies in AGS cells\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — allele-specific expression constructs with functional reporter readout for downstream pathway\",\n      \"pmids\": [\"19166966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Endogenous IL-1β produced by breast cancer cells promotes epithelial-to-mesenchymal transition (altered E-cadherin, N-cadherin, β-catenin), invasion, migration, and bone colonization. Contact between tumor cells and osteoblasts or bone marrow cells increases IL-1β secretion. IL-1B inhibition with Anakinra or canakinumab reduces spontaneous bone metastasis and circulating tumor cells in a humanized mouse model.\",\n      \"method\": \"IL1B transfection/overexpression in MDA-MB-231, MCF7, T47D cells; Anakinra/canakinumab treatment in humanized mouse model; EMT marker Western blotting; invasion/migration assays; co-culture experiments\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function genetic manipulation combined with pharmacological inhibition in vivo, multiple mechanistic readouts\",\n      \"pmids\": [\"30670488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IL-1β triggers SASP production (IL-8, IL-6, TNF-α, CCL2) in bovine oviduct epithelial cells and induces neutrophil migration primarily via CCL2 (not IL-8/CXCR2). IL-1β also promotes PMN adhesion to epithelial cells, and PMN-OEC direct interaction further amplifies SASP production.\",\n      \"method\": \"CCL2 inhibitor (bindarit) and CXCR2 inhibitor experiments, PMN migration assay using conditioned medium, direct co-culture of PMNs and OECs, ELISA and RT-PCR\",\n      \"journal\": \"American journal of reproductive immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection of cytokine-receptor pathway with functional cellular readouts\",\n      \"pmids\": [\"33099841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Lung carcinogens (cigarette smoke condensate and benzo[a]pyrene) induce the IL1B promoter in an allele-specific manner at the -31 T/C polymorphism, with the T-allele promoter showing stronger induction. Bioinformatics and DNA-protein analysis identified a novel transcription factor binding site and protein complex formation at the C-variant promoter.\",\n      \"method\": \"Luciferase reporter assay with allele-specific promoter constructs, carcinogen treatment of NCI-H2009 lung cells, DNA-protein binding assay\",\n      \"journal\": \"Mutation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional allele-specific reporter assay with DNA-protein interaction analysis\",\n      \"pmids\": [\"18656550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-1B signaling in primary tumors inhibits growth by impairing infiltration of innate immune cell subsets with potential anti-cancer functions, but in bone promotes osteolytic metastasis. Using IL-1B/IL1R1 knockout mouse models combined with tumor cell IL-1B overexpression, IL-1B was shown to have opposite immunomodulatory effects at primary vs. metastatic sites.\",\n      \"method\": \"Syngeneic IL-1B/IL1R1 knockout mouse models, genetic overexpression of IL-1B/IL1R1 in tumor cells, Anakinra treatment, immune cell profiling\",\n      \"journal\": \"NPJ breast cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and OE with defined immune phenotyping in site-specific contexts\",\n      \"pmids\": [\"34290237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IL-1β signaling through IL-1R1 is a critical component of radiation-induced skin fibrosis: IL-1β induces its own expression (autocrine amplification), increases MMPs and collagen III in C57BL/6 mice but not in IL1R1 knockout mice, which also show reduced late fibrosis after irradiation.\",\n      \"method\": \"IL1R1 knockout mouse model, exogenous IL-1β protein administration, mRNA expression analysis, histology of irradiated skin\",\n      \"journal\": \"Radiation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined fibrotic phenotype and molecular readouts\",\n      \"pmids\": [\"16435917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Macrophage-derived IL-1β (along with LIF) regulates alpha(1,2)fucosyltransferase 2 (Fut2) expression in mouse uterine epithelial cells during early pregnancy. Anti-IL-1β neutralizing antibodies inhibited macrophage-conditioned medium-stimulated Fut2 expression, and macrophage depletion reduced luminal epithelial fucosylation required for embryo attachment.\",\n      \"method\": \"Neutralizing antibody experiments, macrophage co-culture and conditioned medium assays, macrophage depletion in Cd11b-dtr transgenic mice, laser capture microdissection, quantitative RT-PCR, lectin staining\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — neutralizing antibody functional blockade combined with in vivo macrophage depletion model\",\n      \"pmids\": [\"20864644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NAT1 promotes luminal breast cancer osteolytic bone metastasis through the NAT1/NF-κB/IL-1B axis: NAT1 over-activates NF-κB signaling, upregulates IL-1B expression, which drives osteoclast differentiation and raises the RANKL/OPG ratio in osteoblasts.\",\n      \"method\": \"Cytokine array, NF-κB pathway analysis, NAT1 inhibitor treatment in vitro and in vivo, osteoclast differentiation assay, Western blotting\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cytokine array identifies IL-1B as downstream effector with in vivo validation\",\n      \"pmids\": [\"32905535\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IL-1β (encoded by IL1B) is a pro-inflammatory cytokine whose transcription is regulated by a pre-associated PU.1/IRF8/NTP-Stat1 complex at the LILRE promoter element (activated by IRF8 phosphorylation upon LPS stimulation), by HMGB1-PU.1 cooperative transactivation, by CpG methylation status at the -299 bp promoter site, and by allele-specific transcription factor binding at the -31 T/C SNP; mature IL-1β production is controlled post-translationally by NLRP3 inflammasome activity (modulated by PTPN22 via autophagy-dependent NLRP3 sequestration and by SQSTM1-mediated autophagic degradation of PKM2); once secreted, IL-1β increases intestinal tight junction permeability through MIR200C-3p-mediated degradation of occludin mRNA, drives EMT and bone metastasis in breast cancer, promotes fibrosis via autocrine amplification and MMP/collagen induction, and regulates uterine epithelial fucosylation for embryo implantation.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1984,\n      \"finding\": \"IL1B was cloned from a human monocyte cDNA library and shown to encode a 269 amino acid precursor polypeptide (30,747 Mr); mRNA selected by hybridization to this cDNA was translated in vitro and injected into Xenopus oocytes, which secreted biologically active IL-1β, establishing that the precursor is subsequently processed to the ~15–20 kDa mature form.\",\n      \"method\": \"cDNA cloning, hybrid-selected translation in reticulocyte lysate, Xenopus oocyte expression, immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning with functional reconstitution in two independent expression systems\",\n      \"pmids\": [\"6083565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1984,\n      \"finding\": \"Murine IL-1 (ortholog of IL1B) was cloned and expressed in E. coli; biological activity was confined to the carboxy-terminal 156 amino acids of the 270 amino acid precursor, defining the minimal bioactive domain of the IL-1β precursor.\",\n      \"method\": \"cDNA cloning, E. coli expression of truncated constructs, bioassay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — recombinant expression with domain mapping and functional readout\",\n      \"pmids\": [\"6209582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"Two distinct human IL-1 cDNAs (IL-1α and IL-1β) were isolated from a macrophage library; the primary translation products are 271 and 269 amino acids respectively, and expression of the carboxy-terminal 153 amino acids of IL-1β in E. coli produces IL-1 biological activity, confirming the precursor-to-mature processing model.\",\n      \"method\": \"cDNA library screening, E. coli expression, bioassay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — dual cloning with recombinant expression and functional validation\",\n      \"pmids\": [\"2989698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MyD88 is recruited to the IL-1 receptor complex upon IL-1 stimulation, physically bridges the receptor heterodimer to IRAK, and its ectopic expression or isolated death domain activates NF-κB; the C-terminus of MyD88 blocks IL-1-induced NF-κB but not TNF-induced NF-κB, placing MyD88 as the immediate IL-1R adapter that recruits IRAK.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression, dominant-negative constructs, NF-κB reporter assay\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional epistasis with dominant-negative, replicated concept\",\n      \"pmids\": [\"9430229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL-1β-stimulated TRAF6 activates IKK (and thus NF-κB) through the heterodimeric ubiquitin-conjugating enzyme complex Ubc13/Uev1A, which catalyzes synthesis of K63-linked polyubiquitin chains; blockade of this chain synthesis (but not proteasome inhibition) prevents IKK activation downstream of IL-1R signaling.\",\n      \"method\": \"Protein purification, mass spectrometry, in vitro ubiquitination assay, IKK activation assay, dominant-negative expression\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical reconstitution with mutagenesis and specific inhibition confirming mechanism\",\n      \"pmids\": [\"11057907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IL1B promoter polymorphisms (especially the -511 TATA-box variant) that enhance IL-1β production are associated with risk of H. pylori-induced hypochlorhydria and gastric cancer; in vitro EMSA demonstrated that the -31 TATA-box polymorphism markedly alters DNA-protein interactions, providing a molecular mechanism by which the SNP affects transcription.\",\n      \"method\": \"Case-control genetics, EMSA (electrophoretic mobility shift assay)\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA demonstrating differential protein binding at functional SNP; replicated in multiple populations\",\n      \"pmids\": [\"10746728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Peripheral inflammation induces widespread Cox-2 expression in spinal cord neurons, elevating cerebrospinal fluid PGE2; the critical inducer of central Cox-2 upregulation is IL-1β acting in the CNS, as intraspinal injection of an IL-1-converting enzyme inhibitor or a Cox-2 inhibitor reduced central PGE2 and mechanical hyperalgesia, placing IL-1β upstream of Cox-2-mediated central sensitization.\",\n      \"method\": \"In vivo rodent model, intraspinal drug injection, Cox-2 immunostaining, PGE2 measurement, behavioral pain testing\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological epistasis in vivo with specific inhibitors, multiple orthogonal readouts\",\n      \"pmids\": [\"11260714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The inflammasome — a multiprotein complex comprising caspase-1, caspase-5, Pycard/ASC, and NALP1 — was identified as the molecular platform that activates caspase-1 and processes proIL-1β to mature IL-1β; immunodepletion of Pycard in a cell-free system abolished proIL-1β processing, and dominant-negative Pycard blocked proIL-1β maturation in THP-1 cells after LPS stimulation.\",\n      \"method\": \"Cell-free reconstitution, immunodepletion, dominant-negative expression, caspase activity assay, IL-1β processing assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in cell-free system with immunodepletion and dominant-negative validation; foundational paper (>4900 citations)\",\n      \"pmids\": [\"12191486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"High glucose concentrations induce β-cells themselves (not just immune cells) to produce and release IL-1β, which then activates NF-κB, upregulates Fas, and promotes β-cell apoptosis; the IL-1 receptor antagonist blocked these glucose-induced effects, establishing an autocrine glucotoxic IL-1β loop in human pancreatic islets.\",\n      \"method\": \"Human islet culture, ELISA, NF-κB reporter, Fas immunostaining, TUNEL apoptosis assay, IL-1Ra blockade, in vivo animal model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in primary human tissue plus in vivo confirmation\",\n      \"pmids\": [\"12235117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"IL-1β upregulates HIF-1α protein under normoxia via an NF-κB/COX-2/PGE2 pathway; the induction involves both new transcription and a post-transcriptional mechanism antagonizing VHL-dependent HIF-1α degradation (increased protein stability), leading to VEGF upregulation and linking inflammation to oncogenesis.\",\n      \"method\": \"Reporter assay, Western blot, NF-κB inhibition, COX-2 inhibitor treatment, PGE2 addition, HIF-1α stability assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pathway inhibitors and mechanistic dissection in cell-based system\",\n      \"pmids\": [\"12958148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NALP3 (with NALP2) associates with ASC, the CARD-containing protein Cardinal, and caspase-1 to form an inflammasome with high proIL-1β-processing activity; macrophages from Muckle-Wells patients (carrying gain-of-function NALP3 mutations) spontaneously secrete active IL-1β, establishing that NALP3-dependent inflammasome activation drives IL-1β maturation.\",\n      \"method\": \"Co-immunoprecipitation, caspase-1 activity assay, IL-1β processing assay, patient macrophage studies\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical complex reconstitution plus pathological validation in patient cells\",\n      \"pmids\": [\"15030775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"P2X7 receptor activation in macrophages leads to IL-1β release via pannexin-1 hemichannels; pannexin-1 mediates the large membrane pore responsible for dye uptake and is required for caspase-1 processing and mature IL-1β release, as siRNA knockdown of pannexin-1 abolished both pore formation and IL-1β secretion induced by P2X7 stimulation.\",\n      \"method\": \"Electrophysiology, dye uptake assay, siRNA knockdown, caspase-1 processing assay, IL-1β ELISA\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi with multiple functional readouts demonstrating mechanistic requirement\",\n      \"pmids\": [\"17036048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Non-tyrosine-phosphorylated (NTP)-Stat1 participates in a constitutive trimolecular complex with Spi-1/PU.1 and IRF8 pre-bound at the LPS/IL-1 response element (LILRE) of the IL1B promoter; LPS induces tyrosine phosphorylation of IRF8 (but not Stat1), which is required for IL1B transactivation. A Y211F IRF8 dominant-negative abrogated LPS-induced IL1B reporter activity, and ectopic NTP-Stat1 Y701F enhanced it.\",\n      \"method\": \"Chromatin immunoprecipitation, EMSA, reporter assay, site-directed mutagenesis, dominant-negative expression, in vitro DNA binding with recombinant proteins\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP, EMSA with recombinant proteins, and mutagenesis converging on the same mechanism\",\n      \"pmids\": [\"17386941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The IL1B -31 T/C SNP differentially regulates promoter activity: the T variant drives higher transcription than the C variant in lung epithelial A549 cells. EMSA revealed a unique protein complex on the C allele not present on the T allele; supershift identified C/EBPβ and TBP as components of this complex, explaining allele-specific differences in IL1B expression.\",\n      \"method\": \"Luciferase reporter assay, EMSA, supershift assay\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay plus EMSA/supershift, single lab\",\n      \"pmids\": [\"17587593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Intracellular HMGB1 physically interacts with the Ets transcription factor PU.1 (Spi-1) and co-operates with it to transactivate the IL1B promoter. GST pulldown and co-immunoprecipitation demonstrated direct HMGB1-PU.1 interaction; EMSA showed a ternary complex of PU.1, HMGB1, and the PU.1-binding element in the IL1B promoter. Deletion of the PU.1 winged helix-turn-helix domain abolished the interaction.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, EMSA, reporter assay, domain deletion mutagenesis\",\n      \"journal\": \"European journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — GST pulldown, Co-IP, and EMSA all confirm direct physical interaction with domain mapping\",\n      \"pmids\": [\"18173740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AIM2, identified by crossing a proteomic screen for DNA-binding proteins with interferon-stimulated gene transcripts, senses cytoplasmic dsDNA, recruits the inflammasome adapter ASC, and is necessary and sufficient for IL-1β maturation: AIM2 knockdown impaired DNA-induced IL-1β processing in THP-1 cells, and reconstitution of HEK293 cells with AIM2, ASC, caspase-1, and proIL-1β was sufficient for inflammasome activation.\",\n      \"method\": \"Proteomic/genomic screen, Co-immunoprecipitation, RNAi knockdown, HEK293 reconstitution assay, IL-1β processing assay\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution in naive cells plus knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"19158679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MiR-155 is upregulated by LPS in human monocyte-derived dendritic cells and directly targets TAB2, a signal transduction component of the TLR/IL-1 pathway, forming a negative feedback loop that dampens inflammatory cytokine (including IL-1β) production in response to microbial stimuli.\",\n      \"method\": \"LNA silencing, microarray, luciferase 3'UTR reporter (target validation), cytokine ELISA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct target validation with reporter assay plus LNA silencing with functional readout\",\n      \"pmids\": [\"19193853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human blood monocytes release processed, mature IL-1β after a single TLR2 or TLR4 stimulation due to constitutively activated caspase-1, driven by constitutive NALP3 and ASC activity and autocrine ATP release. In contrast, macrophages require a second ATP stimulus (two-signal requirement) for IL-1β processing, demonstrating cell-type-specific uncoupling of caspase-1 activation from PRR signaling.\",\n      \"method\": \"IL-1β ELISA, caspase-1 activity assay, NALP3/ASC siRNA knockdown, ATP measurement, pharmacological inhibitors\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA plus pharmacological inhibition with multiple readouts; replicated across cell types\",\n      \"pmids\": [\"19104081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The crystal structure of the MyD88-IRAK4-IRAK2 death domain complex revealed a left-handed helical oligomer (Myddosome) comprising 6 MyD88, 4 IRAK4, and 4 IRAK2 DDs; this hierarchical assembly brings IRAK kinase domains into proximity for trans-phosphorylation and activation. Key interface mutations predicted from the structure abrogated signaling, explaining how IL-1R/TLR engagement triggers the IL-1β-driven NF-κB cascade.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, functional signaling assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with mutagenesis-based functional validation\",\n      \"pmids\": [\"20485341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-1β secretion does not follow the conventional ER-Golgi secretory route; multiple mechanisms contribute on a continuum depending on stimulus strength, including caspase-1-dependent and caspase-1-independent pathways, and extracellular vesicle release, as reviewed from diverse experimental systems.\",\n      \"method\": \"Review and synthesis of reconstitution, pharmacological, and cell-biological studies\",\n      \"journal\": \"Cytokine & growth factor reviews\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — synthesis paper, underlying experimental evidence from multiple labs\",\n      \"pmids\": [\"22019906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IL-1β is essential for differentiation of Candida albicans-specific human TH17 cells that co-produce IL-17 and IFN-γ; IL-1β counteracts IL-12-mediated inhibition during priming and suppresses IL-10 production in both differentiating and memory TH17 cells. In vivo blockade of IL-1β increased IL-10 production by memory TH17 cells, establishing IL-1β as a directional regulator of TH17 functional polarization.\",\n      \"method\": \"In vitro naive T-cell priming, cytokine neutralization/blockade, in vivo IL-1β blockade, intracellular cytokine staining, memory T-cell restimulation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo experiments with specific blockade, replicated with antigen-specific cells\",\n      \"pmids\": [\"22466287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CpG methylation at the -299 bp site in the proximal IL1B promoter strongly suppresses transcriptional activity; in situ methylation analysis of human chondrocytes correlated demethylation of this site with high IL1B expression. Transfection of CpG-free luciferase reporters with site-directed CpG mutants confirmed that methylation of the -299 site is the primary epigenetic switch for IL1B transcription in chondrocytes, operating through a mechanism distinct from HIF-2α (which regulates the adjacent MMP13 promoter -110 CpG).\",\n      \"method\": \"In situ bisulfite methylation analysis, CpG-free luciferase reporter transfection with site-directed mutagenesis, chromatin immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis in reporter + in situ tissue analysis + ChIP converging on same site\",\n      \"pmids\": [\"23417678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Caspase-1-mediated pyroptosis, not caspase-3-mediated apoptosis, is the principal death pathway for CD4 T cells during HIV-1 infection in lymphoid tissue; pyroptotic CD4 T cells release IL-1β, linking the two signature events of HIV — CD4 depletion and chronic inflammation. Caspase-1 inhibitors blocked both CD4 T-cell death and IL-1β release.\",\n      \"method\": \"Primary human lymphoid tissue explants, caspase-1 and caspase-3 activity assays, caspase-1 inhibitor treatment, IL-1β ELISA, flow cytometry\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological epistasis with specific caspase inhibitors in primary human tissue\",\n      \"pmids\": [\"24356306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Autophagy-dependent degradation of PELI3 (Pellino3), an E3 ubiquitin ligase and TLR4-scaffold protein, attenuates Il1b mRNA expression in macrophages; PELI3 is ubiquitinated upon LPS stimulation, binds the autophagy receptor SQSTM1/p62, and colocalizes with LC3B and LAMP2. Mutation of PELI3 lysine-316 (K316R) reduced Torin2-dependent PELI3 degradation, identifying this residue as required for autophagic targeting.\",\n      \"method\": \"siRNA knockdown (Sqstm1, Atg7), pharmacological autophagy inhibition, proteasome inhibition, immunofluorescence co-localization, ubiquitination assay, site-directed mutagenesis (K316R), qRT-PCR of Il1b\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological tools plus mutagenesis identifying specific ubiquitination site\",\n      \"pmids\": [\"25483963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PTPN22 loss leads to enhanced NLRP3 phosphorylation, which promotes sequestration of phospho-NLRP3 into autophagosomes, thereby reducing NLRP3 inflammasome activation and IL-1β (IL1B) secretion. Inhibition of autophagy abrogated the inhibitory effect on NLRP3 activation seen in PTPN22-deficient cells, and phosphorylated (but not non-phosphorylated) NLRP3 was found in autophagosomes.\",\n      \"method\": \"Autophagy inhibition (pharmacological and genetic), NLRP3 phosphorylation analysis, autophagosome fractionation, IL-1β secretion assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological autophagy manipulation with fractionation to identify phospho-NLRP3 in autophagosomes\",\n      \"pmids\": [\"28786745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In CD4 T cells, IL1B gene transcription occurs independently of Spi-1/PU.1 (which is required in monocytes) and proceeds from a bivalent H3K4me3+/H3K27me3+ chromatin state at the IL1B promoter; CD3/CD28 stimulation increases IL1B transcription and translation, and the CCR5+ effector memory subset expresses higher proIL-1β than CCR5- T cells, revealing a lymphoid-specific epigenetic regulatory mechanism.\",\n      \"method\": \"ChIP for H3K4me3/H3K27me3, qRT-PCR, Western blot, flow cytometry (cell subset comparison), ex vivo CD3/CD28 activation\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating cell-type-specific bivalent chromatin mark absent in monocytes, with functional transcription data\",\n      \"pmids\": [\"30300855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SQSTM1-dependent autophagic degradation of PKM2 (pyruvate kinase M2) inhibits production of mature IL-1β in macrophages; LIPUS (low-intensity pulsed ultrasound) upregulates autophagy and promotes SQSTM1-PKM2 complex formation. SQSTM1 knockdown reversed the LIPUS-induced decrease in PKM2 and restoration of mature IL-1β, placing PKM2 as a pro-IL-1β factor whose autophagic clearance limits inflammasome output.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation (SQSTM1-PKM2 complex), Western blot (LC3, Beclin-1, PKM2), ELISA (IL-1β), transmission electron microscopy\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP demonstrating complex formation, siRNA epistasis placing SQSTM1 upstream of PKM2 and IL-1β\",\n      \"pmids\": [\"31500508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IL1B increases intestinal tight junction permeability by upregulating MIR200C-3p, which directly degrades occludin mRNA via its 3'UTR; 3D molecular modeling and mutational analyses identified the specific nucleotide bases of the occludin mRNA 3'UTR that interact with MIR200C-3p, and antagomiR-200C prevented IL1B-induced decrease in occludin and the increase in TJ permeability both in vitro and in vivo.\",\n      \"method\": \"miRNA reporter assay, immunoblot, qRT-PCR, transfection with miRNA vectors, antagomiR treatment, intestinal perfusion in vivo, 3D molecular modeling with mutational analysis\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway confirmed by gain- and loss-of-function in vitro and in vivo with mutational mapping of the miRNA-mRNA interaction site\",\n      \"pmids\": [\"32569770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The IL1B -31 polymorphism-driven differential expression of IL-1β modulates gastrin expression at the transcriptional level via NF-κB and HDACs; the -31T IL1B variant drives ~10-fold higher promoter activity than -31C, and IL1B (induced by -31T) represses gastrin promoter activity ~2-fold more than -31C-driven IL1B, with ~1.5-fold greater NF-κB activation.\",\n      \"method\": \"Promoter-reporter transfection, IL1B expression plasmids with allelic variants, NF-κB reporter assay, HDAC inhibitor experiments, gastrin ELISA\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay with allele-specific constructs in cell-based system; single lab\",\n      \"pmids\": [\"19166966\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IL1B encodes a 269-amino-acid precursor (proIL-1β) that is cleaved to mature 17 kDa IL-1β primarily by caspase-1 activated within multiprotein inflammasome complexes (NALP1/NALP3/AIM2 platforms containing ASC and caspase-1); upstream, IL-1R ligation recruits MyD88, which assembles a helical Myddosome with IRAK4 and IRAK2, activating TRAF6 to synthesize K63-polyubiquitin chains that activate IKK/NF-κB; IL1B gene transcription is governed in myeloid cells by a pre-bound Spi-1/PU.1–IRF8–NTP-Stat1 complex at the LILRE enhancer (with IRF8 phosphorylation as the LPS-inducible trigger) and in CD4 T cells by a bivalent H3K4me3+/H3K27me3+ chromatin state independent of PU.1, while epigenetic control via CpG methylation at the -299 promoter site and post-transcriptional regulation via miR-155 (targeting TAB2) and autophagy-dependent degradation of PELI3 and PKM2 further tune IL-1β output; secreted IL-1β drives downstream effectors including Cox-2/PGE2 in the CNS (mediating central pain sensitization), HIF-1α stabilization (linking inflammation to angiogenesis/oncogenesis), and TH17 cell polarization, and also acts in a glucotoxic autocrine loop in pancreatic β-cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"IL-1β is a master pro-inflammatory cytokine that couples transcriptional, post-translational, and paracrine signaling mechanisms to regulate inflammation, tissue remodeling, and immune cell recruitment. Transcription of the IL1B gene is controlled by a pre-assembled PU.1/IRF8/NTP-Stat1 complex at the LILRE promoter element that is activated upon LPS-induced IRF8 phosphorylation, augmented by HMGB1-PU.1 cooperative transactivation, modulated by CpG methylation at the −299 bp site, and tuned by allele-specific transcription factor binding at the −31 T/C SNP, where the T-allele drives higher expression via differential C/EBPβ–TBP complex recruitment [PMID:17386941, PMID:18173740, PMID:19877066, PMID:17587593]. Mature IL-1β secretion is gated by NLRP3 inflammasome activity that is itself restrained by autophagy-dependent mechanisms including PTPN22-driven NLRP3 sequestration into autophagosomes and SQSTM1-mediated degradation of PKM2 [PMID:28786745, PMID:31500508]. Once released, IL-1β disrupts epithelial barriers by upregulating MIR200C-3p to degrade occludin mRNA, drives epithelial-to-mesenchymal transition and bone metastasis in breast cancer, promotes radiation-induced fibrosis through autocrine amplification and MMP/collagen induction, and regulates uterine epithelial fucosylation for embryo implantation [PMID:32569770, PMID:30670488, PMID:16435917, PMID:20864644].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing that IL-1β acts through IL-1R1 in an autocrine loop to drive tissue fibrosis resolved how acute cytokine release is converted into chronic matrix remodeling, showing IL-1β induces its own expression and upregulates MMPs and collagen III in irradiated skin.\",\n      \"evidence\": \"IL1R1 knockout mice showed reduced fibrosis and loss of IL-1β-induced MMP/collagen induction after irradiation\",\n      \"pmids\": [\"16435917\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The specific transcription factors mediating the autocrine IL1B feedback loop were not identified\", \"Whether other IL-1 family members compensate in IL1R1 KO mice was not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Functional dissection of the −31 T/C and −511 promoter polymorphisms demonstrated that allelic variation directly controls IL1B promoter strength, with the −31T allele driving ~10-fold higher activity — providing a mechanistic basis for genotype-phenotype associations in inflammatory disease.\",\n      \"evidence\": \"Luciferase reporter assays with allele-specific constructs correlated with mucosal IL1B mRNA levels in H. pylori-infected patients\",\n      \"pmids\": [\"16550552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The trans-acting factors preferentially binding the −31T allele were not identified in this study\", \"Epistatic interactions with other IL1B promoter SNPs beyond −511 remain uncharacterized\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery of the pre-assembled PU.1/IRF8/NTP-Stat1 trimolecular complex at the LILRE element answered how macrophages achieve rapid IL1B transcriptional induction: LPS-triggered IRF8 Y211 phosphorylation activates a constitutively DNA-bound complex rather than requiring de novo assembly.\",\n      \"evidence\": \"ChIP, EMSA with recombinant proteins, site-directed mutagenesis, and dominant-negative expression in monocytic cells\",\n      \"pmids\": [\"17386941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The kinase responsible for IRF8 Y211 phosphorylation was not definitively identified\", \"Whether this complex operates identically in non-myeloid cells was unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of differential C/EBPβ and TBP binding at the −31 C-variant promoter explained the molecular basis of the allele-specific IL1B expression difference, linking a common SNP to altered transcription factor recruitment.\",\n      \"evidence\": \"EMSA supershift assays with anti-C/EBPβ and anti-TBP antibodies plus luciferase reporter assays\",\n      \"pmids\": [\"17587593\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the C/EBPβ–TBP complex at −31C is inhibitory or simply less activating than the T-variant complex was not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that intracellular HMGB1 cooperates with PU.1 to form a ternary complex on the IL1B promoter revealed a chromatin-architectural mechanism for IL1B transactivation distinct from HMGB1's extracellular alarmin function.\",\n      \"evidence\": \"GST-pulldown and co-IP showing direct HMGB1–PU.1 interaction; EMSA and luciferase reporter assays in PU.1-deficient cells\",\n      \"pmids\": [\"18173740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HMGB1 acts at the same LILRE element as the PU.1/IRF8/Stat1 complex or at a distinct site was not determined\", \"Structural details of the ternary complex are lacking\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linking CpG demethylation at −299 bp to IL1B derepression established an epigenetic gate controlling IL1B transcription, showing that inflammatory cytokines (TNFα/OSM) drive demethylation to enable gene expression in chondrocytes.\",\n      \"evidence\": \"Bisulfite sequencing and methylation-sensitive restriction enzyme assays in primary human articular chondrocytes with 5-azadeoxycytidine controls\",\n      \"pmids\": [\"19877066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The demethylase enzyme responsible for −299 CpG demethylation was not identified\", \"Whether this epigenetic regulation operates in myeloid cells was not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showing that macrophage-derived IL-1β (with LIF) induces Fut2 expression in uterine epithelial cells identified a non-immune paracrine function: IL-1β controls luminal fucosylation required for embryo attachment during implantation.\",\n      \"evidence\": \"Anti-IL-1β neutralizing antibodies blocked Fut2 induction from macrophage-conditioned medium; macrophage depletion in Cd11b-dtr mice reduced uterine fucosylation\",\n      \"pmids\": [\"20864644\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The IL-1β signaling pathway downstream of IL-1R1 leading to Fut2 transcription was not delineated\", \"Contribution of LIF versus IL-1β was not fully separated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Site-directed CpG mutagenesis in a CpG-free reporter confirmed the −299 CpG as a direct transcriptional switch rather than a correlative mark, and distinguished IL1B epigenetic regulation from HIF-2α-dependent mechanisms operating on MMP13.\",\n      \"evidence\": \"CpG mutation in CpG-free luciferase vector transfected into chondrocytes with ChIP validation\",\n      \"pmids\": [\"23417678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The transcription factor(s) whose binding is blocked by −299 methylation remain unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that SQSTM1/p62-mediated autophagic degradation of the E3 ligase PELI3 attenuates IL1B mRNA expression revealed an autophagy–transcription axis regulating IL-1β at the message level, upstream of inflammasome-dependent maturation.\",\n      \"evidence\": \"siRNA knockdown of PELI3/SQSTM1/ATG7 and K316R point mutagenesis in LPS-stimulated macrophages\",\n      \"pmids\": [\"25483963\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How PELI3 promotes IL1B transcription — its relevant ubiquitination substrate — was not defined\", \"Whether PELI3 degradation operates in non-myeloid cells is unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"PTPN22 was identified as a gatekeeper of NLRP3 inflammasome-mediated IL-1β maturation: PTPN22 loss increases NLRP3 phosphorylation, promoting its autophagic sequestration and thereby reducing mature IL-1β secretion — linking a disease-associated phosphatase to inflammasome regulation.\",\n      \"evidence\": \"PTPN22 KO macrophages with autophagy inhibition/induction, autophagosome fractionation, siRNA knockdown of ATG7 and SQSTM1\",\n      \"pmids\": [\"28786745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The specific NLRP3 phosphorylation site(s) regulated by PTPN22 were not mapped\", \"Whether other inflammasomes are similarly regulated was not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing that CD4 T cells transcribe IL1B from a bivalent (H3K4me3+/H3K27me3+) promoter independently of PU.1 overturned the assumption that IL1B is exclusively a myeloid gene and established a distinct epigenetic regulation in lymphoid cells.\",\n      \"evidence\": \"ChIP for histone marks and PU.1 compared between T cells and monocytes, with ex vivo activation and proIL-1β detection\",\n      \"pmids\": [\"30300855\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The transcription factors replacing PU.1 at the IL1B promoter in T cells were not identified\", \"The protease cleaving proIL-1β in T cells was not characterized\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"IL-1β was established as an autocrine/paracrine driver of breast cancer bone metastasis: endogenous IL-1β promotes EMT, invasion, and osteolytic colonization, and pharmacological blockade with Anakinra or canakinumab reduces spontaneous metastasis in humanized mice.\",\n      \"evidence\": \"IL1B overexpression/inhibition in MDA-MB-231 and MCF7 cells; Anakinra/canakinumab treatment in humanized mouse model with EMT markers and metastasis quantification\",\n      \"pmids\": [\"30670488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The downstream signaling pathway from IL-1R1 to EMT transcription factors in tumor cells was not fully mapped\", \"Whether IL-1β drives metastasis to non-bone sites through the same mechanism was not examined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"SQSTM1-mediated autophagic degradation of PKM2 was identified as a mechanism limiting mature IL-1β production, connecting metabolic reprogramming with inflammasome output in macrophages.\",\n      \"evidence\": \"Co-IP of SQSTM1–PKM complex, SQSTM1 knockdown reversal of LIPUS-mediated IL-1β inhibition, in vivo mouse validation\",\n      \"pmids\": [\"31500508\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How PKM2 mechanistically promotes IL-1β maturation (direct or indirect inflammasome regulation) was not resolved\", \"Specificity of LIPUS as physiological trigger requires clarification\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defining the IL-1β → MIR200C-3p → occludin mRNA degradation axis explained how IL-1β disrupts intestinal barrier function at the molecular level, identifying specific nucleotide bases required for miRNA–mRNA interaction.\",\n      \"evidence\": \"Caco-2 monolayers, antagomiR transfection, in vivo mouse intestinal perfusion, 3D molecular modeling with mutational validation\",\n      \"pmids\": [\"32569770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this mechanism operates at other epithelial barriers beyond intestine was not tested\", \"The transcriptional pathway by which IL-1β upregulates MIR200C-3p was not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the identity of the kinase phosphorylating IRF8 at Y211 to activate the LILRE complex; the transcription factors replacing PU.1 for IL1B induction in lymphoid cells; the specific demethylase acting at the −299 CpG site; and how IL-1β exerts opposite immunomodulatory effects at primary tumor versus metastatic bone sites.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"IRF8 Y211 kinase identity unknown\", \"Lymphoid-specific IL1B transcription factor program not defined\", \"Structural basis for the PU.1/HMGB1/IRF8 promoter complex not determined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 12, 13, 16, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 12, 13, 16, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 4, 5, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 8, 13, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 8, 10, 11, 12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8, 9, 10]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 4, 5, 6]}\n    ],\n    \"complexes\": [\n      \"PU.1/IRF8/NTP-Stat1 (LILRE complex)\",\n      \"PU.1/HMGB1 ternary complex\",\n      \"NLRP3 inflammasome\"\n    ],\n    \"partners\": [\n      \"PU.1\",\n      \"IRF8\",\n      \"HMGB1\",\n      \"NLRP3\",\n      \"PTPN22\",\n      \"SQSTM1\",\n      \"PKM2\",\n      \"PELI3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"IL-1β is a master pro-inflammatory cytokine produced as a 269-amino-acid precursor (proIL-1β) that is proteolytically matured to a ~17 kDa secreted form by caspase-1 activated within inflammasome complexes composed of sensor proteins (NALP1, NALP3, or AIM2), the adaptor ASC, and caspase-1 [PMID:12191486, PMID:15030775, PMID:19158679]. IL-1β signals through IL-1R to recruit MyD88, which assembles a helical Myddosome with IRAK4 and IRAK2, culminating in TRAF6-catalyzed K63-polyubiquitin chain synthesis and IKK/NF-κB activation [PMID:9430229, PMID:20485341, PMID:11057907]. Transcription of IL1B is governed in myeloid cells by a constitutive PU.1–IRF8–NTP-Stat1 complex at the LILRE enhancer with LPS-induced IRF8 phosphorylation as the activating trigger, whereas in CD4 T cells a bivalent H3K4me3+/H3K27me3+ chromatin state permits PU.1-independent transcription; CpG methylation at the −299 promoter site serves as an additional epigenetic switch, and autophagy-dependent degradation of PELI3 and PKM2 limits IL-1β output post-transcriptionally [PMID:17386941, PMID:30300855, PMID:23417678, PMID:25483963, PMID:31500508]. Downstream, IL-1β drives Cox-2/PGE2-mediated central pain sensitization, stabilizes HIF-1α to link inflammation to angiogenesis, polarizes TH17 cells, disrupts intestinal tight junctions via miR-200c-3p-mediated occludin degradation, and operates in an autocrine glucotoxic loop that promotes pancreatic β-cell apoptosis [PMID:11260714, PMID:12958148, PMID:22466287, PMID:32569770, PMID:12235117].\",\n  \"teleology\": [\n    {\n      \"year\": 1984,\n      \"claim\": \"Cloning of human and murine IL-1β cDNAs established that IL1B encodes a precursor polypeptide whose carboxy-terminal ~153–156 residues constitute the biologically active mature cytokine, resolving the molecular identity and domain organization of IL-1β.\",\n      \"evidence\": \"cDNA cloning from monocyte/macrophage libraries, E. coli expression of truncation constructs, Xenopus oocyte translation, and bioassay\",\n      \"pmids\": [\"6083565\", \"6209582\", \"2989698\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of precursor cleavage unknown at this point\", \"Signal-less secretion pathway uncharacterized\", \"No structural information on mature IL-1β\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of MyD88 as the IL-1R-proximal adaptor that bridges receptor engagement to IRAK recruitment answered how IL-1β transduces signal from the plasma membrane to the NF-κB cascade.\",\n      \"evidence\": \"Co-immunoprecipitation, dominant-negative death domain constructs, NF-κB reporter assays showing IL-1-specific but not TNF-specific blockade\",\n      \"pmids\": [\"9430229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and oligomeric state of the signaling complex unknown\", \"How IRAK activates downstream kinases not yet resolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstration that TRAF6 activates IKK through Ubc13/Uev1A-catalyzed K63-linked polyubiquitin chains completed the biochemical link between IL-1R engagement and NF-κB activation, establishing a non-degradative ubiquitin signaling paradigm downstream of IL-1β.\",\n      \"evidence\": \"Biochemical reconstitution with purified proteins, mass spectrometry identification of Ubc13/Uev1A, in vitro IKK activation assay, dominant-negative blockade\",\n      \"pmids\": [\"11057907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"K63-chain deubiquitinase regulation not identified\", \"Exact chain attachment sites on TRAF6 substrates unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery of the inflammasome as a multiprotein complex (NALP1/ASC/caspase-1/caspase-5) that activates caspase-1 to process proIL-1β resolved the long-standing question of how the leaderless precursor is matured, establishing the two-signal model of IL-1β production.\",\n      \"evidence\": \"Cell-free reconstitution, immunodepletion of ASC abolishing processing, dominant-negative ASC in THP-1 cells\",\n      \"pmids\": [\"12191486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream danger signals that trigger assembly unknown\", \"Other NLR sensor proteins not yet identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The finding that high glucose induces β-cells themselves to produce IL-1β in an autocrine loop that drives NF-κB activation, Fas upregulation, and apoptosis established a non-immune-cell source and pathogenic function of IL-1β in type 2 diabetes glucotoxicity.\",\n      \"evidence\": \"Human islet culture, ELISA, NF-κB reporter, TUNEL, IL-1Ra blockade, in vivo model\",\n      \"pmids\": [\"12235117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of proIL-1β processing in β-cells (caspase-1-dependent or alternative) not defined\", \"Whether IL-1Ra therapy rescues β-cell mass in vivo not fully resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"IL-1β was shown to stabilize HIF-1α under normoxia through an NF-κB/COX-2/PGE2 pathway that antagonizes VHL-dependent degradation, providing a molecular link between inflammation, angiogenesis, and oncogenesis.\",\n      \"evidence\": \"Reporter assays, Western blot, COX-2 and NF-κB inhibitor epistasis, HIF-1α protein stability measurements\",\n      \"pmids\": [\"12958148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise post-translational modification on HIF-1α affected by PGE2 unknown\", \"In vivo relevance to tumor angiogenesis not demonstrated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of NALP3 as a second inflammasome sensor, with gain-of-function mutations in Muckle-Wells patients causing spontaneous IL-1β release, expanded the inflammasome concept and connected IL-1β to autoinflammatory disease.\",\n      \"evidence\": \"Co-immunoprecipitation of NALP3/ASC/Cardinal/caspase-1 complex, caspase-1 activity assay, patient macrophage studies\",\n      \"pmids\": [\"15030775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular triggers for NALP3 activation not identified\", \"How NALP3 mutations bypass the two-signal requirement unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Pannexin-1 hemichannels were identified as required for P2X7-triggered caspase-1 processing and IL-1β release, addressing how the second signal (extracellular ATP) mechanistically couples to inflammasome activation.\",\n      \"evidence\": \"Pannexin-1 siRNA knockdown abolishing both membrane pore formation and IL-1β secretion, electrophysiology, dye uptake assay\",\n      \"pmids\": [\"17036048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether pannexin-1 is universally required for all inflammasome activators or is P2X7-specific\", \"Physical interaction between pannexin-1 and inflammasome components not shown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Characterization of the PU.1–IRF8–NTP-Stat1 trimolecular complex pre-bound at the LILRE enhancer, with LPS-induced IRF8 tyrosine phosphorylation as the activating switch, defined the myeloid-specific transcriptional mechanism governing IL1B induction.\",\n      \"evidence\": \"ChIP, EMSA with recombinant proteins, reporter assay, IRF8 Y211F dominant-negative mutagenesis\",\n      \"pmids\": [\"17386941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for IRF8 Y211 phosphorylation not identified\", \"Whether this enhancer mechanism operates in all myeloid subsets unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Multiple advances in 2009 refined IL-1β regulation: AIM2 was identified as a cytoplasmic dsDNA sensor forming a third inflammasome platform for IL-1β processing; miR-155 was shown to dampen IL-1β output by targeting TAB2 in a negative feedback loop; and human monocytes were found to constitutively activate caspase-1 requiring only one signal for IL-1β release, unlike macrophages.\",\n      \"evidence\": \"AIM2: proteomic/genomic screen, HEK293 reconstitution, RNAi; miR-155: 3'UTR reporter validation, LNA silencing, cytokine ELISA; monocyte: NALP3/ASC siRNA, ATP measurement, caspase-1 activity\",\n      \"pmids\": [\"19158679\", \"19193853\", \"19104081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AIM2 ligand length and sequence requirements not defined\", \"Mechanism of constitutive caspase-1 activation in monocytes unclear\", \"miR-155 contribution relative to other post-transcriptional regulators not quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The crystal structure of the MyD88–IRAK4–IRAK2 Myddosome revealed a left-handed helical 6:4:4 death domain oligomer, explaining how IL-1R engagement nucleates IRAK kinase trans-phosphorylation and resolving the stoichiometric basis of signal amplification.\",\n      \"evidence\": \"X-ray crystallography, interface mutagenesis with functional signaling assays\",\n      \"pmids\": [\"20485341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Myddosome disassembly is regulated not addressed\", \"Whether other IRAKs substitute in specific cell types unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"IL-1β was established as essential for human TH17 cell differentiation and functional polarization, counteracting IL-12 and suppressing IL-10 in both naive and memory TH17 cells, thereby extending IL-1β's role from innate immunity to adaptive immune programming.\",\n      \"evidence\": \"In vitro naive T-cell priming, in vivo IL-1β blockade, intracellular cytokine staining across antigen-specific and memory subsets\",\n      \"pmids\": [\"22466287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcription factors downstream of IL-1R in T cells mediating IL-10 suppression not identified\", \"Whether IL-1β requirement is pathogen-specific beyond Candida not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"CpG methylation at the −299 site was identified as the primary epigenetic switch controlling IL1B transcription, with demethylation correlating with high expression in human chondrocytes, adding a DNA methylation layer to the transcriptional regulation previously attributed to transcription factors alone.\",\n      \"evidence\": \"Bisulfite sequencing in situ, CpG-free reporter with site-directed methylation mutants, ChIP\",\n      \"pmids\": [\"23417678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Demethylase responsible for −299 CpG demethylation not identified\", \"Whether this site is the dominant switch in other tissues unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two discoveries in 2014 expanded IL-1β biology: caspase-1-dependent pyroptosis was identified as the principal CD4 T-cell death pathway during HIV-1 infection with concomitant IL-1β release linking depletion to chronic inflammation, and autophagy-dependent degradation of the E3 ligase PELI3 was shown to dampen Il1b mRNA expression.\",\n      \"evidence\": \"HIV: caspase-1 inhibitors in primary human lymphoid explants blocking both CD4 death and IL-1β release; PELI3: siRNA, autophagy inhibition, ubiquitination assay, K316R mutagenesis\",\n      \"pmids\": [\"24356306\", \"25483963\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether caspase-1 inhibition can reduce HIV-induced inflammation in vivo clinically unknown\", \"PELI3 substrates relevant to Il1b transcription not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that CD4 T cells activate IL1B transcription from a bivalent H3K4me3+/H3K27me3+ chromatin state independently of PU.1 revealed a lymphoid-specific epigenetic regulatory mechanism fundamentally different from the myeloid PU.1–IRF8 pathway.\",\n      \"evidence\": \"ChIP for bivalent histone marks, qRT-PCR, Western blot, flow cytometry comparing CCR5+ vs CCR5− subsets\",\n      \"pmids\": [\"30300855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcription factor that replaces PU.1 in T cells not identified\", \"Stimulus that resolves the bivalent state not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"IL-1β was shown to disrupt intestinal tight junctions by upregulating miR-200c-3p, which degrades occludin mRNA, establishing a miRNA-mediated mechanism by which IL-1β increases epithelial barrier permeability.\",\n      \"evidence\": \"miRNA reporter assay, antagomiR rescue in vitro and in vivo intestinal perfusion, mutational mapping of miRNA-mRNA interaction site\",\n      \"pmids\": [\"32569770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other tight junction proteins are co-regulated by the same miRNA not tested\", \"Relevance to IBD barrier dysfunction in patients not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the identity of the kinase phosphorylating IRF8 at Y211 to trigger myeloid IL1B transcription, the transcription factor substituting for PU.1 in T-cell IL1B expression, the structural basis of NALP3 activation and the molecular triggers that distinguish sterile from microbial inflammasome assembly, and the relative contributions of multiple unconventional secretion routes for leaderless IL-1β in different physiological contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"IRF8 Y211 kinase identity unknown\", \"T-cell-specific IL1B transcription factor unidentified\", \"Structural mechanism of NLRP3 activation incompletely resolved\", \"Quantitative comparison of unconventional secretion pathways lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 2, 6, 8, 9, 20, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 7, 10, 11, 17, 19]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 10, 22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4, 7, 10, 15, 17, 18, 20, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4, 9, 18, 27]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 22]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [23, 24, 26]}\n    ],\n    \"complexes\": [\n      \"NLRP3 inflammasome\",\n      \"NLRP1 inflammasome\",\n      \"AIM2 inflammasome\",\n      \"Myddosome\"\n    ],\n    \"partners\": [\n      \"CASP1\",\n      \"PYCARD\",\n      \"MYD88\",\n      \"IRAK4\",\n      \"TRAF6\",\n      \"NLRP3\",\n      \"AIM2\",\n      \"IL1R1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}