{"gene":"IL1A","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1985,"finding":"IL-1α and IL-1β are encoded by two distinct but distantly related cDNAs isolated from a macrophage library; the primary translation products are 271 and 269 amino acids, respectively, and the carboxy-terminal portions (~153-159 aa) expressed in E. coli are sufficient to confer IL-1 biological activity.","method":"cDNA cloning, E. coli expression, biological activity assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — original cloning with expression and functional validation; foundational paper replicated across multiple labs","pmids":["2989698"],"is_preprint":false},{"year":1984,"finding":"Murine IL-1 (IL-1α ortholog) is encoded by a 270-amino-acid precursor; the carboxy-terminal 156 amino acids expressed in E. coli yield biologically active IL-1, establishing the domain architecture of the precursor.","method":"cDNA cloning, E. coli expression, biological activity assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of active form in E. coli with mutagenesis-equivalent truncation; foundational","pmids":["6209582"],"is_preprint":false},{"year":1985,"finding":"Human IL-1α precursor (preIL-1α) consists of 271 amino acid residues; expression of the cloned human cDNA in E. coli yields biologically active IL-1α, confirming its distinct gene identity from IL-1β.","method":"cDNA cloning, E. coli expression, biological activity assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — independent cloning and expression confirmation","pmids":["2994016"],"is_preprint":false},{"year":1986,"finding":"Recombinant human IL-1α (carboxy-terminal 154 amino acids) purified to homogeneity stimulates T cell and fibroblast proliferation and induces fibroblast collagenase and prostaglandin production, proving a single IL-1α molecule mediates multiple previously described IL-1 activities.","method":"E. coli expression, protein purification, multiple cell-based bioassays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — purified recombinant protein tested in multiple orthogonal bioassays","pmids":["3485152"],"is_preprint":false},{"year":1986,"finding":"IL-1α and IL-1β share an identical cell-surface receptor (~80 kDa) on murine T cells and fibroblasts and on human cells, as determined by competitive binding studies.","method":"Radiolabeled ligand binding, competition assay, cross-linking","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — reciprocal competition binding on multiple cell types; independently replicated","pmids":["2946959"],"is_preprint":false},{"year":1988,"finding":"The IL-1 receptor (binding both IL-1α and IL-1β) was cloned from mouse T cells; its extracellular domain is 319 amino acids organized in three immunoglobulin-like domains and its cytoplasmic domain is 217 amino acids, placing it in the immunoglobulin superfamily.","method":"cDNA expression cloning, binding assay with radiolabeled IL-1α and IL-1β","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — direct expression cloning with functional binding validation","pmids":["2969618"],"is_preprint":false},{"year":1990,"finding":"Internalized IL-1α remains bound to its receptor intracellularly for at least 4 hours without degradation and accumulates in purified nuclei, demonstrating IL-1α-driven translocation of the cell-surface IL-1 receptor complex to the nucleus.","method":"125I-IL-1α binding, electron microscope autoradiography, subcellular fractionation","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization by EM autoradiography, single study","pmids":["2137488"],"is_preprint":false},{"year":1991,"finding":"IL-1α is processed and released during apoptosis: when cells undergo apoptosis triggered by allospecific cytotoxic T lymphocytes, both IL-1α and IL-1β are efficiently matured intracellularly, whereas necrosis releases IL-1α as a mixture of unprocessed and processed forms with IL-1β remaining as inactive pro-form.","method":"Cell death assays (apoptosis vs. necrosis induction), Western blot for pro- vs. mature IL-1 forms","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — mechanistically distinct processing demonstrated by two different modes of cell death; replicated in the field","pmids":["1924307"],"is_preprint":false},{"year":1994,"finding":"A physical map of the human IL-1 gene cluster places IL1A, IL1B, and IL1RN within an ~430 kb restriction fragment, with IL1A located between 0–35 kb from one terminal CpG island, IL1B between 70–110 kb, and IL1RN between 330–430 kb.","method":"Pulsed-field gel electrophoresis, Southern blotting with gene-specific probes","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — direct physical mapping with multiple restriction enzymes; landmark genomic study","pmids":["8188271"],"is_preprint":false},{"year":2004,"finding":"The precursor form of IL-1α (pro-IL-1α) functions as an intracrine transcriptional activator: it translocates to the nucleus upon TLR ligand stimulation and, independently of IL-1 receptor signaling, activates NF-κB, AP-1, and transcription of IL-8 and IL-6. The transcriptional activation activity resides in the N-terminal pro-piece containing the nuclear localization sequence, not in the C-terminal mature form.","method":"Overexpression with IL-1Ra blockade to prevent receptor signaling, GAL4 reporter system, NF-κB/AP-1 reporter assays, cytokine secretion measurement, intracellular localization imaging","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal assays (reporter, cytokine secretion, localization) with receptor-blockade controls demonstrating receptor-independent nuclear function","pmids":["14983027"],"is_preprint":false},{"year":2008,"finding":"Caspase-1 activity is required for unconventional secretion of pro-IL-1α (as well as FGF-2 and caspase-1 itself) even though pro-IL-1α is not a direct proteolytic substrate of caspase-1; physical interaction between pro-IL-1α and FGF-2 was demonstrated, and iTRAQ proteomics identified additional leaderless proteins whose secretion depends on caspase-1.","method":"Caspase-1 inhibition/knockout, co-immunoprecipitation (physical interaction), iTRAQ secretome proteomics","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 — genetic loss-of-function, co-IP, and proteome-scale secretome analysis; published in high-impact journal with multiple orthogonal approaches","pmids":["18329368"],"is_preprint":false},{"year":2009,"finding":"Cell surface-bound IL-1α (not secreted IL-1α) is the essential upstream regulator of the senescence-associated secretory phenotype (SASP): senescent fibroblasts express high IL-1α mRNA and intracellular/surface protein but secrete little; IL-1Ra, neutralizing anti-IL-1α antibody, or IL-1α siRNA markedly reduced IL-6 and IL-8 secretion. The mechanism involves IL-1α engaging the IL-1 receptor to activate IRAK1, NF-κB, and C/EBPβ, which drive IL-6/IL-8 transcription. IL-1α also controls the invasiveness-promoting activity of senescent cell conditioned medium.","method":"RNA interference, neutralizing antibody, IL-1Ra blockade, NF-κB/C/EBPβ DNA-binding assays, IRAK1 knockdown, multiple senescence induction models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal loss-of-function methods across multiple senescence models; replicated in downstream studies","pmids":["19805069"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of the IL-1β/IL-1RI/IL-1RAcP heterotrimeric signaling complex reveals a stepwise assembly mechanism where IL-1 binds its primary receptor (IL-1RI), which then recruits the accessory protein IL-1RAcP, bringing TIR domains into proximity to initiate NF-κB signaling; structural analysis also reveals evolutionary relationship with the fibroblast growth factor receptor family.","method":"X-ray crystallography of the ternary complex","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure of the activated signaling complex provides atomic-level mechanistic insight","pmids":["22426547"],"is_preprint":false},{"year":2015,"finding":"mTORC1 selectively regulates pro-inflammatory SASP by promoting IL-1α translation: rapamycin reduced overall cytokine mRNA levels, but specifically suppressed translation of membrane-bound IL-1α. Reduced IL-1α diminished NF-κB transcriptional activity controlling much of the SASP, and exogenous IL-1α restored IL-6 secretion to rapamycin-treated senescent cells. Rapamycin also suppressed the ability of senescent fibroblasts to stimulate prostate tumor growth in mice.","method":"Rapamycin treatment, IL-1α rescue experiment, NF-κB activity assay, cytokine secretion measurement, mouse xenograft tumor model","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — genetic/pharmacologic manipulation with in vitro and in vivo validation and rescue experiments; highly cited","pmids":["26147250"],"is_preprint":false},{"year":2007,"finding":"Intratesticular administration of IL-1α disrupts the blood-testis barrier (BTB) and Sertoli-germ cell adhesion without reducing steady-state levels of BTB proteins (OCLN, CLDN1, F11R, TJP1, CDH2); instead, IL-1α alters the localization of OCLN, F11R, and TJP1 away from cell-cell contact sites and perturbs filamentous actin organization at the BTB and apical ectoplasmic specialization, indicating the Sertoli cell actin cytoskeleton is the primary cellular target of IL-1α in BTB restructuring.","method":"Intratesticular injection in rats, inulin-FITC permeability assay, immunofluorescence localization, Western blot, F-actin staining","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function with mechanistic localization studies, single study","pmids":["18057314"],"is_preprint":false},{"year":2018,"finding":"The age-associated decline of DNMT3A in hematopoietic cells enhances IL-1α production; IL-1α from myeloid progenitor-like cells drives enhanced emergency myelopoiesis in aging, promotes lung cancer progression, and disrupting IL-1R1 signaling early in tumor development normalized myelopoiesis and slowed growth of lung, colonic, and pancreatic tumors.","method":"Genetic mouse models (DNMT3A manipulation, IL-1R1 deletion), scRNA-seq, in vivo tumor models","journal":"Science","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with multiple tumor models; single primary study","pmids":["39236155"],"is_preprint":false},{"year":2021,"finding":"DOT1L, a H3K79 methyltransferase, epigenetically regulates IL1A gene expression during oncogene-induced senescence (OIS): DOT1L is necessary and sufficient for increased H3K79me2/3 occupancy specifically at the IL1A gene locus (but not other SASP genes), downstream of STING activation, thereby controlling IL-1α-driven SASP without affecting senescence-associated cell cycle arrest.","method":"ChIP-seq, DOT1L knockdown/overexpression, STING pathway manipulation, IL1A promoter occupancy assays","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq with gain- and loss-of-function of writer enzyme at specific locus; single study","pmids":["34037658"],"is_preprint":false},{"year":2018,"finding":"NETs promote endothelial cell (EC) activation and tissue factor production through IL-1α: anti-IL-1α neutralizing antibody (but not anti-IL-1β) blocked NET-induced VCAM-1, ICAM-1, and tissue factor expression. Cathepsin G (abundant in NETs) potentiates this by cleaving pro-IL-1α to release the more potent mature IL-1α form.","method":"Neutralizing antibodies, cathepsin G inhibition, mRNA and protein expression assays, clotting assays in cell-free and EC systems","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 — specific antibody blockade distinguishing IL-1α from IL-1β and identification of cathepsin G as pro-IL-1α processing enzyme; single study","pmids":["29976772"],"is_preprint":false},{"year":2023,"finding":"A de novo missense variant in IL-1R1 (p.Lys131Glu) identified in a CRMO patient disrupts binding of the antagonist ligand IL-1Ra but preserves binding of IL-1α and IL-1β, resulting in unopposed IL-1 signaling. Mice with the homologous mutation showed hyperinflammation and enhanced collagen antibody-induced arthritis with pathological osteoclastogenesis, establishing that differential receptor contacts distinguish agonist (IL-1α/IL-1β) from antagonist (IL-1Ra) binding.","method":"Patient genetics, binding assays, knock-in mouse model, arthritis model, structural inference","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 — human variant + knock-in mouse model demonstrating receptor selectivity; single study","pmids":["37315560"],"is_preprint":false},{"year":2023,"finding":"Aging-associated IL-1 elevation in the bone marrow drives IL-1R1-dependent expansion of Tet2+/− hematopoietic stem and progenitor cells (HSPCs) by increasing cell cycle progression, multilineage differentiation, and repopulation capacity; genetic deletion of IL-1R1 specifically in Tet2+/− HSPCs or pharmacologic IL-1 inhibition impaired Tet2+/− clonal expansion, establishing IL-1 pathway as a mechanistic driver of TET2-mutant clonal hematopoiesis.","method":"Bone marrow transplantation, genetic mosaicism mouse models, IL-1R1 conditional deletion, IL-1α administration, transcriptomic analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with multiple models; single primary study","pmids":["36379023"],"is_preprint":false},{"year":2021,"finding":"IL-1α secreted by tumor cells engages IL-1R1 on pancreatic stellate cells (PSCs) as an upstream mediator of IL-6 release, which in turn activates STAT3 in tumor cells; IL-1R1 inhibition with anakinra reduced stromal IL-6 and STAT3 activation in human PDAC cell lines and in a genetic mouse model, and combination with chemotherapy extended survival.","method":"Co-culture experiments, IL-1R1 blockade (anakinra), genetic mouse model (PKT), STAT3 activity assays, survival analysis","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro and in vivo mechanistic validation of tumor-stromal IL-1α/IL-6/STAT3 axis; single study","pmids":["34518296"],"is_preprint":false}],"current_model":"IL-1α (IL1A) is synthesized as a 271-amino-acid leaderless precursor that can function intracellularly as a nuclear transcriptional activator (via its N-terminal pro-piece/NLS), on the cell surface as a paracrine/juxtacrine signal driving NF-κB–dependent cytokine networks (most prominently the senescence-associated IL-6/IL-8 secretory phenotype), and extracellularly after release during apoptosis or processing by cathepsin G; its unconventional secretion depends on caspase-1 activity (without being a direct substrate), mTORC1 selectively controls its translation to regulate SASP amplitude, DOT1L epigenetically governs its locus-specific transcription via H3K79 methylation, and it signals through the shared IL-1RI/IL-1RAcP heterotrimeric receptor complex whose crystal structure reveals stepwise assembly and distinct contacts that distinguish IL-1α/β agonism from IL-1Ra antagonism."},"narrative":{"teleology":[{"year":1984,"claim":"Cloning of the murine IL-1α precursor and demonstration that the C-terminal ~156 residues constitute the biologically active domain established the fundamental domain architecture of the cytokine.","evidence":"cDNA cloning with E. coli expression and truncation bioassays","pmids":["6209582"],"confidence":"High","gaps":["Function of the N-terminal pro-piece unknown","Processing protease(s) unidentified","Receptor identity unknown"]},{"year":1985,"claim":"Independent cloning of human IL-1α and IL-1β from macrophage libraries resolved the longstanding question of IL-1 heterogeneity, proving two distinct genes encode proteins with overlapping bioactivities.","evidence":"cDNA cloning of both genes, E. coli expression, and parallel bioassays","pmids":["2989698","2994016"],"confidence":"High","gaps":["Whether the two forms signal through the same or different receptors unresolved","Secretion mechanism for leaderless IL-1α unknown"]},{"year":1986,"claim":"Competitive binding studies demonstrated that IL-1α and IL-1β share an identical ~80 kDa cell-surface receptor, establishing the shared receptor paradigm for the IL-1 family.","evidence":"Radiolabeled ligand competition and cross-linking on murine and human cells","pmids":["2946959","3485152"],"confidence":"High","gaps":["Receptor cDNA not yet cloned","Accessory proteins for signaling not identified"]},{"year":1988,"claim":"Molecular cloning of the IL-1 receptor from T cells revealed a single-pass transmembrane protein with three Ig-like extracellular domains, placing IL-1 signaling within the immunoglobulin superfamily.","evidence":"Expression cloning from murine T cells with radiolabeled IL-1α/β binding validation","pmids":["2969618"],"confidence":"High","gaps":["Accessory chain(s) for signal transduction not identified","Intracellular signaling mechanism unknown"]},{"year":1991,"claim":"Distinguishing apoptotic from necrotic release showed that IL-1α is processed and released during apoptosis whereas necrosis releases predominantly unprocessed pro-IL-1α, establishing cell death mode as a determinant of IL-1α bioactivity.","evidence":"Apoptosis (CTL-mediated) vs. necrosis induction with Western blot for pro/mature forms","pmids":["1924307"],"confidence":"High","gaps":["Identity of the intracellular protease(s) mediating apoptotic processing unknown","Whether necrotic release of pro-IL-1α has biological activity in vivo unclear"]},{"year":2004,"claim":"Demonstration that pro-IL-1α functions as an intracrine transcriptional activator—translocating to the nucleus and activating NF-κB/AP-1 independently of IL-1 receptor engagement—revealed a receptor-independent signaling mode residing in the N-terminal pro-piece/NLS.","evidence":"Overexpression with IL-1Ra receptor blockade, GAL4 reporter, NF-κB/AP-1 reporters, cytokine secretion","pmids":["14983027"],"confidence":"High","gaps":["Nuclear binding partners/chromatin targets of pro-IL-1α unidentified","Physiological contexts where intracrine function dominates over paracrine unclear"]},{"year":2008,"claim":"Caspase-1 was shown to be required for unconventional secretion of pro-IL-1α without being its direct protease, revealing a non-canonical secretion pathway shared with other leaderless proteins like FGF-2.","evidence":"Caspase-1 KO and pharmacologic inhibition, co-IP of pro-IL-1α with FGF-2, iTRAQ secretome proteomics","pmids":["18329368"],"confidence":"High","gaps":["Molecular mechanism by which caspase-1 promotes secretion of non-substrates unresolved","Vesicular vs. non-vesicular route of export not determined"]},{"year":2009,"claim":"Cell-surface IL-1α was identified as the essential upstream initiator of the SASP, acting through IL-1RI/IRAK1/NF-κB/C/EBPβ to drive IL-6 and IL-8 transcription in senescent cells, thus positioning IL-1α as the master regulator of senescence-associated inflammation.","evidence":"siRNA, neutralizing antibody, IL-1Ra blockade across multiple senescence models; IRAK1 knockdown","pmids":["19805069"],"confidence":"High","gaps":["Regulation of IL-1α surface presentation during senescence not characterized","Whether intracrine IL-1α also contributes to SASP gene induction not separated"]},{"year":2012,"claim":"The crystal structure of the IL-1β/IL-1RI/IL-1RAcP ternary complex established the stepwise assembly mechanism for IL-1 signaling and provided the structural basis for distinguishing agonist from antagonist receptor binding.","evidence":"X-ray crystallography of the heterotrimeric complex","pmids":["22426547"],"confidence":"High","gaps":["No ternary structure with IL-1α as the ligand available","Structural basis of IL-1α vs. IL-1β selectivity at IL-1RI not resolved at atomic level"]},{"year":2015,"claim":"mTORC1 was identified as the selective translational controller of IL-1α during senescence, explaining how nutrient-sensing pathways regulate SASP amplitude—rapamycin suppressed IL-1α translation, NF-κB activity, and tumor-promoting effects of senescent cells in vivo.","evidence":"Rapamycin treatment with IL-1α rescue, NF-κB assays, mouse xenograft tumor model","pmids":["26147250"],"confidence":"High","gaps":["Specific mRNA cis-elements or trans-factors linking mTORC1 to IL1A translation not identified","Whether mTORC1 control is unique to senescence or operates in other IL-1α-producing contexts unknown"]},{"year":2018,"claim":"Cathepsin G present in neutrophil extracellular traps (NETs) was identified as a protease that processes pro-IL-1α to its active mature form, mediating NET-induced endothelial activation and tissue factor expression specifically through IL-1α rather than IL-1β.","evidence":"Neutralizing antibodies distinguishing IL-1α from IL-1β, cathepsin G inhibition, endothelial activation assays","pmids":["29976772"],"confidence":"Medium","gaps":["Cathepsin G cleavage site in pro-IL-1α not mapped at amino acid level","Relative contribution of cathepsin G vs. other proteases in vivo not established"]},{"year":2021,"claim":"DOT1L was found to epigenetically regulate IL1A transcription during oncogene-induced senescence by depositing H3K79me2/3 at the IL1A locus downstream of STING, providing the first locus-specific epigenetic writer controlling SASP initiation.","evidence":"ChIP-seq, DOT1L knockdown/overexpression, STING pathway perturbation","pmids":["34037658"],"confidence":"Medium","gaps":["Mechanism linking STING activation to DOT1L recruitment at IL1A locus not defined","Whether DOT1L regulation of IL1A operates outside senescence contexts unknown"]},{"year":2023,"claim":"A human IL-1R1 missense variant (K131E) that selectively abolishes IL-1Ra binding while preserving IL-1α/β agonist binding provided genetic proof that structurally distinct receptor contacts separate agonist from antagonist engagement, with functional validation in a knock-in mouse model showing hyperinflammation.","evidence":"Patient genetics, binding assays, knock-in mouse model, arthritis model","pmids":["37315560"],"confidence":"Medium","gaps":["No ternary crystal structure with IL-1α to confirm predicted contact differences","Single family — broader allelic spectrum at IL-1R1 not explored"]},{"year":null,"claim":"Key unresolved questions include the nuclear binding partners and chromatin targets of the intracrine pro-IL-1α pro-piece, the structural basis of IL-1α (vs. IL-1β) selectivity at the receptor at atomic resolution, and the precise vesicular or non-vesicular mechanism by which caspase-1 facilitates IL-1α unconventional secretion.","evidence":"","pmids":[],"confidence":"Low","gaps":["No atomic-resolution structure of IL-1α bound to IL-1RI/IL-1RAcP","Intracrine nuclear targets of pro-IL-1α pro-piece unidentified","Mechanism of caspase-1-dependent unconventional secretion of non-substrate cargo unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[3,4,11,13]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11,13,20]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,9]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[11,13]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[7,10,17]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4,11,17,19]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,11,12,13,18]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[11,13,16]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,16]}],"complexes":[],"partners":["IL1R1","IL1RAP","FGF2","CASP1","CTSG","DOT1L"],"other_free_text":[]},"mechanistic_narrative":"IL-1α is a pleiotropic pro-inflammatory cytokine synthesized as a 271-amino-acid leaderless precursor (pro-IL-1α) that operates through three distinct modes: as an intracrine nuclear transcriptional activator via its N-terminal pro-piece containing a nuclear localization sequence, as a cell-surface juxtacrine signal that engages the IL-1RI/IL-1RAcP receptor complex to activate NF-κB and C/EBPβ, and as a mature secreted cytokine released upon apoptosis or cathepsin G cleavage [PMID:14983027, PMID:19805069, PMID:29976772]. Cell-surface IL-1α is the master upstream regulator of the senescence-associated secretory phenotype (SASP), driving IL-6 and IL-8 transcription through IRAK1–NF-κB signaling, with its translation selectively controlled by mTORC1 and its locus-specific transcription epigenetically regulated by DOT1L-mediated H3K79 methylation downstream of STING [PMID:19805069, PMID:26147250, PMID:34037658]. Unconventional secretion of pro-IL-1α depends on caspase-1 activity without pro-IL-1α being a direct caspase-1 substrate, and the ternary IL-1/IL-1RI/IL-1RAcP signaling complex assembles through a stepwise mechanism in which agonist and antagonist ligands make structurally distinguishable receptor contacts [PMID:18329368, PMID:22426547, PMID:37315560]."},"prefetch_data":{"uniprot":{"accession":"P01583","full_name":"Interleukin-1 alpha","aliases":["Hematopoietin-1"],"length_aa":271,"mass_kda":30.6,"function":"Cytokine constitutively present intracellularly in nearly all resting non-hematopoietic cells that plays an important role in inflammation and bridges the innate and adaptive immune systems (PubMed:26439902). After binding to its receptor IL1R1 together with its accessory protein IL1RAP, forms the high affinity interleukin-1 receptor complex (PubMed:17507369, PubMed:2950091). Signaling involves the recruitment of adapter molecules such as MYD88, IRAK1 or IRAK4 (PubMed:17507369). In turn, mediates the activation of NF-kappa-B and the three MAPK pathways p38, p42/p44 and JNK pathways (PubMed:14687581). Within the cell, acts as an alarmin and cell death results in its liberation in the extracellular space after disruption of the cell membrane to induce inflammation and alert the host to injury or damage (PubMed:15679580). 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its extracellular domain (319 aa) is composed of three immunoglobulin-like domains and binds both IL-1α and IL-1β with indistinguishable affinity compared to the native receptor; the cytoplasmic portion is 217 aa long.\",\n      \"method\": \"cDNA expression cloning, direct binding assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original receptor cloning with functional binding validation, foundational paper\",\n      \"pmids\": [\"2969618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"IL-1α, after binding its cell-surface receptor, is internalized and the IL-1/IL-1R complex is translocated to the nucleus without degradation, suggesting a nuclear site for IL-1R signaling.\",\n      \"method\": \"Electron microscope autoradiography, nuclear fractionation of 125I-IL-1α in EL-4 T cells\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct subcellular localization with functional correlation; single lab\",\n      \"pmids\": [\"2137488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"A20 zinc finger protein inhibits IL-1 (and TNF) signal transduction, blocking NF-κB and AP-1 activation downstream of receptor binding but upstream of second-messenger activation, acting as a negative regulator of the IL-1 signaling pathway.\",\n      \"method\": \"Overexpression in MCF7 and WEHI-S cells, NF-κB/AP-1 reporter assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — overexpression with pathway readout; single lab, single method\",\n      \"pmids\": [\"8557994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"NIK (MAP3K14), a MAPKK kinase-related kinase that binds TRAF2, participates in an NF-κB-inducing signaling cascade common to TNF/NGF receptors and the IL-1 type I receptor; kinase-deficient NIK mutants block NF-κB induction by IL-1.\",\n      \"method\": \"Yeast two-hybrid cloning, dominant-negative kinase mutant expression, NF-κB reporter assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — kinase-dead mutant epistasis + reporter assay; highly cited foundational paper\",\n      \"pmids\": [\"9020361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"IL-1 type I receptor (IL-1RI) is the signaling receptor responsible for IL-1α- and IL-1β-mediated responses; IL-1RI-deficient mice fail to produce IL-6 in response to murine IL-1α injection, confirming IL-1RI as the required signaling receptor.\",\n      \"method\": \"IL-1RI knockout mouse, in vivo IL-1α injection, serum IL-6 measurement\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific phenotypic readout, replicated in multiple assays\",\n      \"pmids\": [\"9317135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Resident islet macrophages are the cellular source of IL-1α (and IL-1β) in human pancreatic islets; endogenously released IL-1 drives iNOS expression and nitric oxide production in beta cells, leading to inhibition of glucose-stimulated insulin secretion.\",\n      \"method\": \"RT-PCR, IL-1 receptor antagonist (IRAP) blockade, immunohistochemical co-localization, macrophage depletion\",\n      \"journal\": \"Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (receptor antagonist blockade, cell depletion, RT-PCR, IHC co-localization) in a single study\",\n      \"pmids\": [\"9691088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"T6BP (TRAF6-binding protein) specifically associates with TRAF6 via its coiled-coil region interacting with TRAF6's N-terminal RING/zinc finger domains; IL-1 (but not TNF) stimulation induces TRAF6-T6BP complex formation in an IRAK-dependent manner, forming a complex distinct from the TRAF6-IRAK complex.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, IL-1 stimulation assays in cells\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP with domain mapping and ligand-specificity; single lab\",\n      \"pmids\": [\"10920205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TAB3, a TAB2-related protein, associates with TAK1 and interacts with TRAF6 in an IL-1-dependent manner; IL-1 signaling leads to TRAF6-dependent ubiquitination of TAB3; combined siRNA knockdown of TAB2 and TAB3 inhibits IL-1-induced TAK1 and NF-κB activation, indicating TAB2 and TAB3 function redundantly as mediators of TAK1 activation in IL-1 signaling.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assay, ubiquitination assay\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, siRNA epistasis, and ubiquitination assay; multiple orthogonal methods\",\n      \"pmids\": [\"14633987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IL-1α disrupts the blood-testis barrier (BTB) in rat seminiferous epithelium by perturbing the Sertoli cell actin cytoskeleton, altering the localization of tight junction proteins (OCLN, F11R, TJP1) away from cell-cell contacts without changing their steady-state protein levels.\",\n      \"method\": \"Intratesticular IL-1α injection, fluorescent tracer permeability assay, Western blot, immunofluorescence localization\",\n      \"journal\": \"Biology of Reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo loss-of-function with mechanistic follow-up (localization shift, actin disruption); single lab\",\n      \"pmids\": [\"18057314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GRX-1 (glutaredoxin-1) deglutathionylates TRAF6 upon IL-1 receptor stimulation; the RING-finger motif of TRAF6 is S-glutathionylated under basal conditions, and GRX-1-mediated deglutathionylation is required for TRAF6 auto-polyubiquitination and subsequent NF-κB activation downstream of IL-1R.\",\n      \"method\": \"siRNA knockdown, S-glutathionylation assay, ubiquitination assay, NF-κB reporter in HEK293/HeLa cells\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — enzymatic mechanism (deglutathionylation) linked to pathway activation with RNAi epistasis\",\n      \"pmids\": [\"21078302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the IL-1β–IL-1RI–IL-1RAcP ternary signaling complex reveals the molecular mechanism of IL-1 family cytokine signal initiation: IL-1β first binds IL-1RI, which then recruits the accessory protein IL-1RAcP to form a signaling-competent heterotrimeric complex; the structure also reveals an evolutionary relationship between IL-1RI and the fibroblast growth factor receptor family.\",\n      \"method\": \"X-ray crystallography of the ternary signaling complex\",\n      \"journal\": \"Nature Structural & Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure of the complete activating signaling complex\",\n      \"pmids\": [\"22426547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"mTORC1 selectively promotes IL-1α translation in senescent cells; rapamycin suppresses mTORC1 and reduces IL-1α protein levels without substantially affecting IL-1α mRNA, thereby reducing IL-1α-driven NF-κB transcriptional activity and downstream SASP cytokines (e.g., IL-6); exogenous IL-1α restores IL-6 secretion in rapamycin-treated senescent cells.\",\n      \"method\": \"Rapamycin treatment, polysome profiling, exogenous IL-1α rescue, NF-κB reporter, mouse xenograft\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (translation assay, rescue experiment, in vivo xenograft) in a single study; highly cited\",\n      \"pmids\": [\"26147250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L, an H3K79 methyltransferase acting downstream of STING, specifically increases H3K79me2/3 occupancy at the IL1A gene locus in oncogene-induced senescent cells, promoting IL1A transcription and contributing to the SASP; DOT1L modulation did not affect other SASP genes or the senescence-associated cell cycle arrest.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), DOT1L knockdown/overexpression, histone modification profiling, STING pathway epistasis\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with gene-locus specificity, KD/OE with defined molecular and phenotypic readout, epistasis to STING\",\n      \"pmids\": [\"34037658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"IL-1α drives IL-1R1-dependent expansion of Tet2+/- hematopoietic stem and progenitor cells (HSPCs) during aging-associated clonal hematopoiesis; IL-1α-treated Tet2+/- HSCs show increased DNA replication/repair signatures and reduced susceptibility to IL-1α-mediated downregulation of self-renewal genes; genetic deletion of IL-1R1 in Tet2+/- HSPCs or pharmacologic IL-1 inhibition impairs Tet2+/- clonal expansion.\",\n      \"method\": \"Bone marrow transplantation, genetic mosaicism mouse model, IL-1R1 conditional knockout, IL-1α administration, transcriptomic profiling\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (IL-1R1 KO), pharmacologic blockade, and transcriptomic readout with multiple orthogonal approaches\",\n      \"pmids\": [\"36379023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A de novo missense variant in IL-1R1 (p.Lys131Glu) disrupts binding of the antagonist IL-1Ra but not of IL-1α or IL-1β, resulting in unopposed IL-1 signaling and autoinflammation; homologous knock-in mice recapitulate hyperinflammation and increased susceptibility to arthritis with pathological osteoclastogenesis.\",\n      \"method\": \"Patient PBMC analysis, structural biology, binding assays, knock-in mouse model, CRMO patient genetic analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — structure-function mutagenesis, binding specificity assay, and in vivo knock-in model\",\n      \"pmids\": [\"37315560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-1α produced by myeloid progenitor-like cells in lung tumors drives age-associated emergency myelopoiesis; the age-associated decline of DNMT3A enhances IL-1α production; disrupting IL-1R1 signaling early in tumor development normalized myelopoiesis and slowed growth of lung, colonic, and pancreatic tumors.\",\n      \"method\": \"Hematopoietic aging mouse model, IL-1R1 blockade, DNMT3A genetic manipulation, tumor growth assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacologic IL-1R1 disruption with defined cellular and tumor-growth phenotypes; multiple tumor models\",\n      \"pmids\": [\"39236155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-1α produced by pancreatic tumor cells engages IL-1R1 on stromal pancreatic stellate cells to drive IL-6 secretion, which in turn activates STAT3 in tumor cells; IL-1R1 inhibition with anakinra reduces stromal IL-6 and tumor STAT3 activation and extends survival in a genetic mouse model of PDAC.\",\n      \"method\": \"Co-culture assays, anakinra treatment, STAT3 phosphorylation assay, PKT mouse survival study\",\n      \"journal\": \"Molecular Cancer Therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor blockade with defined molecular mechanism (IL-1α→IL-1R1→IL-6→STAT3) validated in vivo\",\n      \"pmids\": [\"34518296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Activated human platelets express surface-associated IL-1α activity (approximately 20% inhibited by anti-IL-1α mAb); this surface IL-1 is not secreted but remains platelet-associated, providing a mechanism for localized IL-1 signaling at sites of inflammation.\",\n      \"method\": \"T cell line IL-1 bioassay, neutralizing mAb inhibition, supernatant vs. cell-associated fractionation\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional bioassay with antibody specificity; surface vs. secreted fractionation; single lab\",\n      \"pmids\": [\"2592766\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IL-1α is a pleiotropic alarmin cytokine that can signal in membrane-associated, cytosolic precursor, or secreted forms; it binds IL-1RI together with the accessory protein IL-1RAcP (as revealed by crystal structure) to activate NF-κB (via TAK1/TAB2/TAB3 and NIK) and MAPK pathways, with its translation selectively regulated by mTORC1 and its transcription epigenetically controlled by DOT1L-mediated H3K79 methylation at the IL1A locus, while in the tumor microenvironment IL-1α drives stromal IL-6/STAT3 signaling and age-associated myelopoiesis in an IL-1R1-dependent manner.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1985,\n      \"finding\": \"IL-1α and IL-1β are encoded by two distinct but distantly related cDNAs isolated from a macrophage library; the primary translation products are 271 and 269 amino acids, respectively, and the carboxy-terminal portions (~153-159 aa) expressed in E. coli are sufficient to confer IL-1 biological activity.\",\n      \"method\": \"cDNA cloning, E. coli expression, biological activity assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning with expression and functional validation; foundational paper replicated across multiple labs\",\n      \"pmids\": [\"2989698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1984,\n      \"finding\": \"Murine IL-1 (IL-1α ortholog) is encoded by a 270-amino-acid precursor; the carboxy-terminal 156 amino acids expressed in E. coli yield biologically active IL-1, establishing the domain architecture of the precursor.\",\n      \"method\": \"cDNA cloning, E. coli expression, biological activity assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of active form in E. coli with mutagenesis-equivalent truncation; foundational\",\n      \"pmids\": [\"6209582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"Human IL-1α precursor (preIL-1α) consists of 271 amino acid residues; expression of the cloned human cDNA in E. coli yields biologically active IL-1α, confirming its distinct gene identity from IL-1β.\",\n      \"method\": \"cDNA cloning, E. coli expression, biological activity assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — independent cloning and expression confirmation\",\n      \"pmids\": [\"2994016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"Recombinant human IL-1α (carboxy-terminal 154 amino acids) purified to homogeneity stimulates T cell and fibroblast proliferation and induces fibroblast collagenase and prostaglandin production, proving a single IL-1α molecule mediates multiple previously described IL-1 activities.\",\n      \"method\": \"E. coli expression, protein purification, multiple cell-based bioassays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purified recombinant protein tested in multiple orthogonal bioassays\",\n      \"pmids\": [\"3485152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"IL-1α and IL-1β share an identical cell-surface receptor (~80 kDa) on murine T cells and fibroblasts and on human cells, as determined by competitive binding studies.\",\n      \"method\": \"Radiolabeled ligand binding, competition assay, cross-linking\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal competition binding on multiple cell types; independently replicated\",\n      \"pmids\": [\"2946959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"The IL-1 receptor (binding both IL-1α and IL-1β) was cloned from mouse T cells; its extracellular domain is 319 amino acids organized in three immunoglobulin-like domains and its cytoplasmic domain is 217 amino acids, placing it in the immunoglobulin superfamily.\",\n      \"method\": \"cDNA expression cloning, binding assay with radiolabeled IL-1α and IL-1β\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct expression cloning with functional binding validation\",\n      \"pmids\": [\"2969618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Internalized IL-1α remains bound to its receptor intracellularly for at least 4 hours without degradation and accumulates in purified nuclei, demonstrating IL-1α-driven translocation of the cell-surface IL-1 receptor complex to the nucleus.\",\n      \"method\": \"125I-IL-1α binding, electron microscope autoradiography, subcellular fractionation\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by EM autoradiography, single study\",\n      \"pmids\": [\"2137488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"IL-1α is processed and released during apoptosis: when cells undergo apoptosis triggered by allospecific cytotoxic T lymphocytes, both IL-1α and IL-1β are efficiently matured intracellularly, whereas necrosis releases IL-1α as a mixture of unprocessed and processed forms with IL-1β remaining as inactive pro-form.\",\n      \"method\": \"Cell death assays (apoptosis vs. necrosis induction), Western blot for pro- vs. mature IL-1 forms\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistically distinct processing demonstrated by two different modes of cell death; replicated in the field\",\n      \"pmids\": [\"1924307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"A physical map of the human IL-1 gene cluster places IL1A, IL1B, and IL1RN within an ~430 kb restriction fragment, with IL1A located between 0–35 kb from one terminal CpG island, IL1B between 70–110 kb, and IL1RN between 330–430 kb.\",\n      \"method\": \"Pulsed-field gel electrophoresis, Southern blotting with gene-specific probes\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct physical mapping with multiple restriction enzymes; landmark genomic study\",\n      \"pmids\": [\"8188271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The precursor form of IL-1α (pro-IL-1α) functions as an intracrine transcriptional activator: it translocates to the nucleus upon TLR ligand stimulation and, independently of IL-1 receptor signaling, activates NF-κB, AP-1, and transcription of IL-8 and IL-6. The transcriptional activation activity resides in the N-terminal pro-piece containing the nuclear localization sequence, not in the C-terminal mature form.\",\n      \"method\": \"Overexpression with IL-1Ra blockade to prevent receptor signaling, GAL4 reporter system, NF-κB/AP-1 reporter assays, cytokine secretion measurement, intracellular localization imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal assays (reporter, cytokine secretion, localization) with receptor-blockade controls demonstrating receptor-independent nuclear function\",\n      \"pmids\": [\"14983027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Caspase-1 activity is required for unconventional secretion of pro-IL-1α (as well as FGF-2 and caspase-1 itself) even though pro-IL-1α is not a direct proteolytic substrate of caspase-1; physical interaction between pro-IL-1α and FGF-2 was demonstrated, and iTRAQ proteomics identified additional leaderless proteins whose secretion depends on caspase-1.\",\n      \"method\": \"Caspase-1 inhibition/knockout, co-immunoprecipitation (physical interaction), iTRAQ secretome proteomics\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic loss-of-function, co-IP, and proteome-scale secretome analysis; published in high-impact journal with multiple orthogonal approaches\",\n      \"pmids\": [\"18329368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cell surface-bound IL-1α (not secreted IL-1α) is the essential upstream regulator of the senescence-associated secretory phenotype (SASP): senescent fibroblasts express high IL-1α mRNA and intracellular/surface protein but secrete little; IL-1Ra, neutralizing anti-IL-1α antibody, or IL-1α siRNA markedly reduced IL-6 and IL-8 secretion. The mechanism involves IL-1α engaging the IL-1 receptor to activate IRAK1, NF-κB, and C/EBPβ, which drive IL-6/IL-8 transcription. IL-1α also controls the invasiveness-promoting activity of senescent cell conditioned medium.\",\n      \"method\": \"RNA interference, neutralizing antibody, IL-1Ra blockade, NF-κB/C/EBPβ DNA-binding assays, IRAK1 knockdown, multiple senescence induction models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal loss-of-function methods across multiple senescence models; replicated in downstream studies\",\n      \"pmids\": [\"19805069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the IL-1β/IL-1RI/IL-1RAcP heterotrimeric signaling complex reveals a stepwise assembly mechanism where IL-1 binds its primary receptor (IL-1RI), which then recruits the accessory protein IL-1RAcP, bringing TIR domains into proximity to initiate NF-κB signaling; structural analysis also reveals evolutionary relationship with the fibroblast growth factor receptor family.\",\n      \"method\": \"X-ray crystallography of the ternary complex\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure of the activated signaling complex provides atomic-level mechanistic insight\",\n      \"pmids\": [\"22426547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"mTORC1 selectively regulates pro-inflammatory SASP by promoting IL-1α translation: rapamycin reduced overall cytokine mRNA levels, but specifically suppressed translation of membrane-bound IL-1α. Reduced IL-1α diminished NF-κB transcriptional activity controlling much of the SASP, and exogenous IL-1α restored IL-6 secretion to rapamycin-treated senescent cells. Rapamycin also suppressed the ability of senescent fibroblasts to stimulate prostate tumor growth in mice.\",\n      \"method\": \"Rapamycin treatment, IL-1α rescue experiment, NF-κB activity assay, cytokine secretion measurement, mouse xenograft tumor model\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic/pharmacologic manipulation with in vitro and in vivo validation and rescue experiments; highly cited\",\n      \"pmids\": [\"26147250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Intratesticular administration of IL-1α disrupts the blood-testis barrier (BTB) and Sertoli-germ cell adhesion without reducing steady-state levels of BTB proteins (OCLN, CLDN1, F11R, TJP1, CDH2); instead, IL-1α alters the localization of OCLN, F11R, and TJP1 away from cell-cell contact sites and perturbs filamentous actin organization at the BTB and apical ectoplasmic specialization, indicating the Sertoli cell actin cytoskeleton is the primary cellular target of IL-1α in BTB restructuring.\",\n      \"method\": \"Intratesticular injection in rats, inulin-FITC permeability assay, immunofluorescence localization, Western blot, F-actin staining\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with mechanistic localization studies, single study\",\n      \"pmids\": [\"18057314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The age-associated decline of DNMT3A in hematopoietic cells enhances IL-1α production; IL-1α from myeloid progenitor-like cells drives enhanced emergency myelopoiesis in aging, promotes lung cancer progression, and disrupting IL-1R1 signaling early in tumor development normalized myelopoiesis and slowed growth of lung, colonic, and pancreatic tumors.\",\n      \"method\": \"Genetic mouse models (DNMT3A manipulation, IL-1R1 deletion), scRNA-seq, in vivo tumor models\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple tumor models; single primary study\",\n      \"pmids\": [\"39236155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L, a H3K79 methyltransferase, epigenetically regulates IL1A gene expression during oncogene-induced senescence (OIS): DOT1L is necessary and sufficient for increased H3K79me2/3 occupancy specifically at the IL1A gene locus (but not other SASP genes), downstream of STING activation, thereby controlling IL-1α-driven SASP without affecting senescence-associated cell cycle arrest.\",\n      \"method\": \"ChIP-seq, DOT1L knockdown/overexpression, STING pathway manipulation, IL1A promoter occupancy assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq with gain- and loss-of-function of writer enzyme at specific locus; single study\",\n      \"pmids\": [\"34037658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NETs promote endothelial cell (EC) activation and tissue factor production through IL-1α: anti-IL-1α neutralizing antibody (but not anti-IL-1β) blocked NET-induced VCAM-1, ICAM-1, and tissue factor expression. Cathepsin G (abundant in NETs) potentiates this by cleaving pro-IL-1α to release the more potent mature IL-1α form.\",\n      \"method\": \"Neutralizing antibodies, cathepsin G inhibition, mRNA and protein expression assays, clotting assays in cell-free and EC systems\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — specific antibody blockade distinguishing IL-1α from IL-1β and identification of cathepsin G as pro-IL-1α processing enzyme; single study\",\n      \"pmids\": [\"29976772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A de novo missense variant in IL-1R1 (p.Lys131Glu) identified in a CRMO patient disrupts binding of the antagonist ligand IL-1Ra but preserves binding of IL-1α and IL-1β, resulting in unopposed IL-1 signaling. Mice with the homologous mutation showed hyperinflammation and enhanced collagen antibody-induced arthritis with pathological osteoclastogenesis, establishing that differential receptor contacts distinguish agonist (IL-1α/IL-1β) from antagonist (IL-1Ra) binding.\",\n      \"method\": \"Patient genetics, binding assays, knock-in mouse model, arthritis model, structural inference\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human variant + knock-in mouse model demonstrating receptor selectivity; single study\",\n      \"pmids\": [\"37315560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Aging-associated IL-1 elevation in the bone marrow drives IL-1R1-dependent expansion of Tet2+/− hematopoietic stem and progenitor cells (HSPCs) by increasing cell cycle progression, multilineage differentiation, and repopulation capacity; genetic deletion of IL-1R1 specifically in Tet2+/− HSPCs or pharmacologic IL-1 inhibition impaired Tet2+/− clonal expansion, establishing IL-1 pathway as a mechanistic driver of TET2-mutant clonal hematopoiesis.\",\n      \"method\": \"Bone marrow transplantation, genetic mosaicism mouse models, IL-1R1 conditional deletion, IL-1α administration, transcriptomic analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple models; single primary study\",\n      \"pmids\": [\"36379023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-1α secreted by tumor cells engages IL-1R1 on pancreatic stellate cells (PSCs) as an upstream mediator of IL-6 release, which in turn activates STAT3 in tumor cells; IL-1R1 inhibition with anakinra reduced stromal IL-6 and STAT3 activation in human PDAC cell lines and in a genetic mouse model, and combination with chemotherapy extended survival.\",\n      \"method\": \"Co-culture experiments, IL-1R1 blockade (anakinra), genetic mouse model (PKT), STAT3 activity assays, survival analysis\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo mechanistic validation of tumor-stromal IL-1α/IL-6/STAT3 axis; single study\",\n      \"pmids\": [\"34518296\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IL-1α (IL1A) is synthesized as a 271-amino-acid leaderless precursor that can function intracellularly as a nuclear transcriptional activator (via its N-terminal pro-piece/NLS), on the cell surface as a paracrine/juxtacrine signal driving NF-κB–dependent cytokine networks (most prominently the senescence-associated IL-6/IL-8 secretory phenotype), and extracellularly after release during apoptosis or processing by cathepsin G; its unconventional secretion depends on caspase-1 activity (without being a direct substrate), mTORC1 selectively controls its translation to regulate SASP amplitude, DOT1L epigenetically governs its locus-specific transcription via H3K79 methylation, and it signals through the shared IL-1RI/IL-1RAcP heterotrimeric receptor complex whose crystal structure reveals stepwise assembly and distinct contacts that distinguish IL-1α/β agonism from IL-1Ra antagonism.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"IL-1α is a pleiotropic alarmin cytokine that signals through IL-1 receptor type I (IL-1RI) to activate NF-κB and MAPK cascades, functioning as a master regulator of inflammation, senescence-associated secretory phenotype (SASP), and hematopoietic homeostasis. IL-1α binds IL-1RI, which recruits the accessory protein IL-1RAcP to form a heterotrimeric signaling complex that engages TRAF6, TAK1/TAB2/TAB3, and NIK to activate NF-κB [PMID:22426547, PMID:14633987, PMID:9020361, PMID:9317135]. IL-1α translation is selectively controlled by mTORC1 in senescent cells, while its transcription is epigenetically promoted by DOT1L-mediated H3K79 methylation at the IL1A locus downstream of STING, positioning IL-1α as a nodal initiator of the SASP that drives paracrine IL-6 secretion via NF-κB [PMID:26147250, PMID:34037658]. In the tumor microenvironment, tumor-derived IL-1α engages stromal IL-1R1 to induce IL-6/STAT3 signaling and promotes IL-1R1-dependent clonal expansion of mutant hematopoietic stem cells and age-associated emergency myelopoiesis [PMID:34518296, PMID:36379023, PMID:39236155].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Cloning of the IL-1 receptor (IL-1RI) established that a single receptor with three immunoglobulin-like extracellular domains binds both IL-1α and IL-1β with equal affinity, defining the entry point of IL-1α signaling.\",\n      \"evidence\": \"cDNA expression cloning and direct radiolabeled binding assays in mouse T cells\",\n      \"pmids\": [\"2969618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Accessory proteins required for signaling not yet identified\", \"Downstream intracellular transduction mechanism unknown\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Demonstration that activated platelets express surface-associated, non-secreted IL-1α activity revealed that IL-1α can function as a membrane-bound signal, distinct from the classical secreted cytokine paradigm.\",\n      \"evidence\": \"T cell bioassay with neutralizing anti-IL-1α mAb, surface vs. supernatant fractionation of activated human platelets\",\n      \"pmids\": [\"2592766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular form of surface IL-1α (precursor vs. processed) not determined\", \"Mechanism of membrane retention unresolved\", \"Only partial neutralization (~20%) by anti-IL-1α mAb\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Observation that the IL-1α/IL-1R complex is internalized and translocated to the nucleus intact raised the possibility of a nuclear signaling mechanism, though this remained largely unexplored.\",\n      \"evidence\": \"Electron microscope autoradiography and nuclear fractionation of 125I-IL-1α in EL-4 T cells\",\n      \"pmids\": [\"2137488\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear function of internalized complex not demonstrated\", \"No functional readout linked to nuclear translocation\", \"Single cell line, single lab\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Genetic ablation of IL-1RI and identification of NIK as an NF-κB-inducing kinase downstream of IL-1R established that IL-1RI is the sole signaling receptor for IL-1α and that NF-κB activation is a principal downstream output.\",\n      \"evidence\": \"IL-1RI knockout mice with IL-1α challenge (serum IL-6 readout); dominant-negative NIK mutant blocking IL-1-induced NF-κB reporter activity\",\n      \"pmids\": [\"9317135\", \"9020361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Proximal adapter cascade from receptor to NIK not fully delineated\", \"Contribution of IL-1RI-independent pathways to IL-1α biology not excluded in all tissues\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of resident islet macrophages as the cellular source of IL-1α in human pancreatic islets linked autocrine/paracrine IL-1α to iNOS induction and impaired beta-cell insulin secretion, extending IL-1α function to metabolic tissue homeostasis.\",\n      \"evidence\": \"RT-PCR, receptor antagonist blockade, macrophage depletion, and immunohistochemistry in human pancreatic islets\",\n      \"pmids\": [\"9691088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of IL-1α vs. IL-1β to beta-cell dysfunction not fully resolved\", \"Mechanism of IL-1α release from islet macrophages unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Discovery that TAB2 and TAB3 function as redundant adaptors linking TRAF6 to TAK1 in an IL-1-dependent, ubiquitination-regulated manner defined the core proximal signaling module (TRAF6→TAB2/3→TAK1→NF-κB) downstream of IL-1R.\",\n      \"evidence\": \"Co-immunoprecipitation, combined TAB2/TAB3 siRNA knockdown, NF-κB reporter, and ubiquitination assay\",\n      \"pmids\": [\"14633987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of TAB2/3 recognition of TRAF6 polyubiquitin chains not yet resolved\", \"Redundancy between TAB2 and TAB3 not tested in vivo\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The crystal structure of the IL-1β–IL-1RI–IL-1RAcP ternary complex provided the atomic-level mechanism of IL-1 family signal initiation, showing sequential binary (cytokine–receptor) then ternary (accessory protein recruitment) complex assembly.\",\n      \"evidence\": \"X-ray crystallography of the complete heterotrimeric signaling complex\",\n      \"pmids\": [\"22426547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Equivalent ternary structure with IL-1α rather than IL-1β not solved\", \"Structural basis of IL-1Ra antagonism at the ternary complex level not fully resolved at the time\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstration that mTORC1 selectively controls IL-1α translation in senescent cells, and that IL-1α is a master upstream initiator of NF-κB-driven SASP (including IL-6), established IL-1α as the critical translational gatekeeper of the senescence secretome.\",\n      \"evidence\": \"Rapamycin treatment with polysome profiling, exogenous IL-1α rescue of IL-6, NF-κB reporter, and mouse xenograft\",\n      \"pmids\": [\"26147250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific mRNA cis-elements mediating mTORC1-dependent IL-1α translation not identified\", \"Whether mTORC1 regulation operates through 4E-BP or S6K not distinguished\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of DOT1L-mediated H3K79 methylation as a STING-dependent epigenetic activator of IL1A transcription during oncogene-induced senescence revealed a gene-locus-specific chromatin mechanism controlling IL-1α production independent of other SASP genes.\",\n      \"evidence\": \"ChIP for H3K79me2/3 at the IL1A locus, DOT1L knockdown/overexpression, STING epistasis\",\n      \"pmids\": [\"34037658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting STING to DOT1L activation not delineated\", \"Whether DOT1L regulation of IL1A operates in non-senescent inflammatory contexts unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Two studies revealed that tumor-derived IL-1α drives critical paracrine signaling circuits: in pancreatic cancer, IL-1α engages stromal IL-1R1 to produce IL-6 that activates tumor STAT3; in lung tumors, myeloid progenitor IL-1α drives age-associated emergency myelopoiesis, with DNMT3A decline enhancing IL-1α output.\",\n      \"evidence\": \"Co-culture and anakinra blockade in PDAC mouse models; hematopoietic aging mouse model with IL-1R1 disruption across lung, colonic, and pancreatic tumor models\",\n      \"pmids\": [\"34518296\", \"39236155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of IL-1α vs. IL-1β in the tumor microenvironment varies by model and is incompletely resolved\", \"Mechanism by which DNMT3A loss upregulates IL-1α not fully defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"IL-1α was shown to drive IL-1R1-dependent clonal expansion of Tet2-haploinsufficient HSPCs during aging, and a human IL-1R1 missense variant that selectively abolishes IL-1Ra binding (but not IL-1α/β binding) causes autoinflammation, demonstrating the pathological consequences of unopposed IL-1α signaling.\",\n      \"evidence\": \"Bone marrow transplantation with IL-1R1 conditional KO and transcriptomics in Tet2+/- mice; patient genetic analysis, binding assays, and knock-in mouse model for IL-1R1 p.Lys131Glu\",\n      \"pmids\": [\"36379023\", \"37315560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IL-1α vs. IL-1β differentially drives Tet2-mutant clonal hematopoiesis not resolved\", \"Structural basis of selective loss of IL-1Ra binding with preserved IL-1α/β binding at the mutant receptor requires further structural analysis\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular basis of IL-1α precursor processing and unconventional release, the cis-regulatory elements mediating mTORC1-dependent translational control, and the relative contributions of membrane-bound versus secreted IL-1α forms to tissue-specific signaling outcomes remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Processing protease(s) for IL-1α precursor not definitively identified in many cell types\", \"No structural model of IL-1α (vs. IL-1β) bound to IL-1RI–IL-1RAcP\", \"Mechanism of unconventional IL-1α secretion in non-myeloid cells poorly characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 4, 10, 11, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [5, 11, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4, 7, 10, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 5, 14, 15]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [13, 15, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"IL1R1\",\n      \"IL1RAP\",\n      \"TRAF6\",\n      \"TAK1\",\n      \"TAB2\",\n      \"TAB3\",\n      \"NIK\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"IL-1α is a pleiotropic pro-inflammatory cytokine synthesized as a 271-amino-acid leaderless precursor (pro-IL-1α) that operates through three distinct modes: as an intracrine nuclear transcriptional activator via its N-terminal pro-piece containing a nuclear localization sequence, as a cell-surface juxtacrine signal that engages the IL-1RI/IL-1RAcP receptor complex to activate NF-κB and C/EBPβ, and as a mature secreted cytokine released upon apoptosis or cathepsin G cleavage [PMID:14983027, PMID:19805069, PMID:29976772]. Cell-surface IL-1α is the master upstream regulator of the senescence-associated secretory phenotype (SASP), driving IL-6 and IL-8 transcription through IRAK1–NF-κB signaling, with its translation selectively controlled by mTORC1 and its locus-specific transcription epigenetically regulated by DOT1L-mediated H3K79 methylation downstream of STING [PMID:19805069, PMID:26147250, PMID:34037658]. Unconventional secretion of pro-IL-1α depends on caspase-1 activity without pro-IL-1α being a direct caspase-1 substrate, and the ternary IL-1/IL-1RI/IL-1RAcP signaling complex assembles through a stepwise mechanism in which agonist and antagonist ligands make structurally distinguishable receptor contacts [PMID:18329368, PMID:22426547, PMID:37315560].\",\n  \"teleology\": [\n    {\n      \"year\": 1984,\n      \"claim\": \"Cloning of the murine IL-1α precursor and demonstration that the C-terminal ~156 residues constitute the biologically active domain established the fundamental domain architecture of the cytokine.\",\n      \"evidence\": \"cDNA cloning with E. coli expression and truncation bioassays\",\n      \"pmids\": [\"6209582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Function of the N-terminal pro-piece unknown\",\n        \"Processing protease(s) unidentified\",\n        \"Receptor identity unknown\"\n      ]\n    },\n    {\n      \"year\": 1985,\n      \"claim\": \"Independent cloning of human IL-1α and IL-1β from macrophage libraries resolved the longstanding question of IL-1 heterogeneity, proving two distinct genes encode proteins with overlapping bioactivities.\",\n      \"evidence\": \"cDNA cloning of both genes, E. coli expression, and parallel bioassays\",\n      \"pmids\": [\"2989698\", \"2994016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether the two forms signal through the same or different receptors unresolved\",\n        \"Secretion mechanism for leaderless IL-1α unknown\"\n      ]\n    },\n    {\n      \"year\": 1986,\n      \"claim\": \"Competitive binding studies demonstrated that IL-1α and IL-1β share an identical ~80 kDa cell-surface receptor, establishing the shared receptor paradigm for the IL-1 family.\",\n      \"evidence\": \"Radiolabeled ligand competition and cross-linking on murine and human cells\",\n      \"pmids\": [\"2946959\", \"3485152\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Receptor cDNA not yet cloned\",\n        \"Accessory proteins for signaling not identified\"\n      ]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Molecular cloning of the IL-1 receptor from T cells revealed a single-pass transmembrane protein with three Ig-like extracellular domains, placing IL-1 signaling within the immunoglobulin superfamily.\",\n      \"evidence\": \"Expression cloning from murine T cells with radiolabeled IL-1α/β binding validation\",\n      \"pmids\": [\"2969618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Accessory chain(s) for signal transduction not identified\",\n        \"Intracellular signaling mechanism unknown\"\n      ]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Distinguishing apoptotic from necrotic release showed that IL-1α is processed and released during apoptosis whereas necrosis releases predominantly unprocessed pro-IL-1α, establishing cell death mode as a determinant of IL-1α bioactivity.\",\n      \"evidence\": \"Apoptosis (CTL-mediated) vs. necrosis induction with Western blot for pro/mature forms\",\n      \"pmids\": [\"1924307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the intracellular protease(s) mediating apoptotic processing unknown\",\n        \"Whether necrotic release of pro-IL-1α has biological activity in vivo unclear\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstration that pro-IL-1α functions as an intracrine transcriptional activator—translocating to the nucleus and activating NF-κB/AP-1 independently of IL-1 receptor engagement—revealed a receptor-independent signaling mode residing in the N-terminal pro-piece/NLS.\",\n      \"evidence\": \"Overexpression with IL-1Ra receptor blockade, GAL4 reporter, NF-κB/AP-1 reporters, cytokine secretion\",\n      \"pmids\": [\"14983027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Nuclear binding partners/chromatin targets of pro-IL-1α unidentified\",\n        \"Physiological contexts where intracrine function dominates over paracrine unclear\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Caspase-1 was shown to be required for unconventional secretion of pro-IL-1α without being its direct protease, revealing a non-canonical secretion pathway shared with other leaderless proteins like FGF-2.\",\n      \"evidence\": \"Caspase-1 KO and pharmacologic inhibition, co-IP of pro-IL-1α with FGF-2, iTRAQ secretome proteomics\",\n      \"pmids\": [\"18329368\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which caspase-1 promotes secretion of non-substrates unresolved\",\n        \"Vesicular vs. non-vesicular route of export not determined\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Cell-surface IL-1α was identified as the essential upstream initiator of the SASP, acting through IL-1RI/IRAK1/NF-κB/C/EBPβ to drive IL-6 and IL-8 transcription in senescent cells, thus positioning IL-1α as the master regulator of senescence-associated inflammation.\",\n      \"evidence\": \"siRNA, neutralizing antibody, IL-1Ra blockade across multiple senescence models; IRAK1 knockdown\",\n      \"pmids\": [\"19805069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Regulation of IL-1α surface presentation during senescence not characterized\",\n        \"Whether intracrine IL-1α also contributes to SASP gene induction not separated\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The crystal structure of the IL-1β/IL-1RI/IL-1RAcP ternary complex established the stepwise assembly mechanism for IL-1 signaling and provided the structural basis for distinguishing agonist from antagonist receptor binding.\",\n      \"evidence\": \"X-ray crystallography of the heterotrimeric complex\",\n      \"pmids\": [\"22426547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No ternary structure with IL-1α as the ligand available\",\n        \"Structural basis of IL-1α vs. IL-1β selectivity at IL-1RI not resolved at atomic level\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"mTORC1 was identified as the selective translational controller of IL-1α during senescence, explaining how nutrient-sensing pathways regulate SASP amplitude—rapamycin suppressed IL-1α translation, NF-κB activity, and tumor-promoting effects of senescent cells in vivo.\",\n      \"evidence\": \"Rapamycin treatment with IL-1α rescue, NF-κB assays, mouse xenograft tumor model\",\n      \"pmids\": [\"26147250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific mRNA cis-elements or trans-factors linking mTORC1 to IL1A translation not identified\",\n        \"Whether mTORC1 control is unique to senescence or operates in other IL-1α-producing contexts unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cathepsin G present in neutrophil extracellular traps (NETs) was identified as a protease that processes pro-IL-1α to its active mature form, mediating NET-induced endothelial activation and tissue factor expression specifically through IL-1α rather than IL-1β.\",\n      \"evidence\": \"Neutralizing antibodies distinguishing IL-1α from IL-1β, cathepsin G inhibition, endothelial activation assays\",\n      \"pmids\": [\"29976772\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Cathepsin G cleavage site in pro-IL-1α not mapped at amino acid level\",\n        \"Relative contribution of cathepsin G vs. other proteases in vivo not established\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"DOT1L was found to epigenetically regulate IL1A transcription during oncogene-induced senescence by depositing H3K79me2/3 at the IL1A locus downstream of STING, providing the first locus-specific epigenetic writer controlling SASP initiation.\",\n      \"evidence\": \"ChIP-seq, DOT1L knockdown/overexpression, STING pathway perturbation\",\n      \"pmids\": [\"34037658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking STING activation to DOT1L recruitment at IL1A locus not defined\",\n        \"Whether DOT1L regulation of IL1A operates outside senescence contexts unknown\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A human IL-1R1 missense variant (K131E) that selectively abolishes IL-1Ra binding while preserving IL-1α/β agonist binding provided genetic proof that structurally distinct receptor contacts separate agonist from antagonist engagement, with functional validation in a knock-in mouse model showing hyperinflammation.\",\n      \"evidence\": \"Patient genetics, binding assays, knock-in mouse model, arthritis model\",\n      \"pmids\": [\"37315560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No ternary crystal structure with IL-1α to confirm predicted contact differences\",\n        \"Single family — broader allelic spectrum at IL-1R1 not explored\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the nuclear binding partners and chromatin targets of the intracrine pro-IL-1α pro-piece, the structural basis of IL-1α (vs. IL-1β) selectivity at the receptor at atomic resolution, and the precise vesicular or non-vesicular mechanism by which caspase-1 facilitates IL-1α unconventional secretion.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No atomic-resolution structure of IL-1α bound to IL-1RI/IL-1RAcP\",\n        \"Intracrine nuclear targets of pro-IL-1α pro-piece unidentified\",\n        \"Mechanism of caspase-1-dependent unconventional secretion of non-substrate cargo unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [3, 4, 11, 13]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11, 13, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11, 13]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 10, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4, 11, 17, 19]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 11, 12, 13, 18]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [11, 13, 16]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"IL1R1\",\n      \"IL1RAP\",\n      \"FGF2\",\n      \"CASP1\",\n      \"CTSG\",\n      \"DOT1L\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}