{"gene":"SERPINB3","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1998,"finding":"SCCA1 (SERPINB3) inhibits papain-like cysteine proteinases (cathepsins L, S, K) and this inhibitory activity is fully dependent on the reactive site loop (RSL); RSL swaps between SCCA1 and SCCA2 reversed their target specificities, demonstrating that the RSL sequence and mobility are essential for cysteine proteinase inhibition.","method":"Site-directed mutagenesis of RSL residues, RSL swap experiments between SCCA1 and SCCA2, in vitro protease inhibition assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in vitro with mutagenesis, mechanistically rigorous","pmids":["9811823"],"is_preprint":false},{"year":1998,"finding":"SCCA1 (SERPINB3) is a potent cross-class inhibitor of papain-like cysteine proteinases (cathepsins L, S, K), while SCCA2 (SERPINB4) inhibits chymotrypsin-like serine proteinases (cathepsin G, mast cell chymase); the two paralogs map to 18q21.3.","method":"Biochemical analysis of recombinant SCCA1 and SCCA2 proteins; in vitro protease inhibition assays","journal":"Tumour biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with recombinant proteins, replicated across labs","pmids":["9817977","9817978"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of SCCA1 (SERPINB3) revealed a flexible reactive center loop (RCL) located away from the main body; truncation of the RCL abolished SCCA1's inhibitory effect on JNK1 kinase activity, and a single RCL point mutation that reduced protease inhibition retained JNK1 suppression, indicating the RCL mediates both protease and JNK1 inhibition through partially overlapping but distinct mechanisms.","method":"X-ray crystallography, RCL truncation mutants, in vitro JNK1 kinase activity assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with mutagenesis and in vitro kinase assay in one study","pmids":["19166818"],"is_preprint":false},{"year":2010,"finding":"SERPINB3 induces epithelial-mesenchymal transition (EMT) in HepG2 cells, characterized by reduced E-cadherin, increased beta-catenin and vimentin, loss of desmosomal junctions, and increased cell migration and invasiveness; these effects occurred at both autocrine and paracrine levels and did not require anti-protease activity, as an active-loop-deleted recombinant SERPINB3 retained EMT-inducing activity.","method":"Stable transfection of HepG2 cells with SERPINB3 gene, exogenous recombinant SERPINB3 treatment of HepG2 and MDCK cells, active-loop-deleted mutant protein, morphological/ultrastructural analysis, western blot, invasion and migration assays, soft agar colony formation","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including mutagenesis, gain-of-function, and paracrine models in one study","pmids":["20527027"],"is_preprint":false},{"year":2010,"finding":"SERPINB3 modulates TGF-beta1 expression in hepatocytes; transfection with intact SERPINB3 increased TGF-beta1 mRNA and protein, and this effect required an intact reactive site loop, implicating the anti-protease activity in TGF-beta1 induction.","method":"Transfection of hepatocytes and hepatoma cell lines (HepG2, Huh7) with SERPINB3 or reactive-site-loop-deleted mutants, real-time PCR, ELISA, correlation with liver biopsy data","journal":"Laboratory investigation","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function with mutagenesis, single lab","pmids":["20212457"],"is_preprint":false},{"year":2014,"finding":"Oncogenic Ras transcriptionally upregulates SERPINB3 (SCCA1) via the MAPK pathway and ETS transcription factor PEA3; elevated SCCA1 inhibits protein turnover, activates the unfolded protein response (UPR) and NF-κB, and is required for Ras-mediated cytokine production and tumor growth.","method":"Genetic knockdown and overexpression in cell lines, reporter assays for PEA3 binding, UPR markers, NF-κB assays, xenograft tumor growth assays, analysis of human colorectal and pancreatic tumor samples","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, epistasis established, replicated in human samples","pmids":["24759783"],"is_preprint":false},{"year":2014,"finding":"SCCA1 (SERPINB3) promotes oncogenic transformation and EMT in mammary epithelial cells and drives a prolonged non-lethal UPR that activates NF-κB and IL-6 autocrine signaling, contributing to protumorigenic inflammation.","method":"Stable overexpression and siRNA knockdown in mammary epithelial and breast cancer cells, UPR marker analysis, NF-κB reporter assays, IL-6 ELISA, neu+ mammary tumor mouse model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including in vivo model, single lab","pmids":["25213322"],"is_preprint":false},{"year":2015,"finding":"Hypoxia upregulates SERPINB3 transcription, protein synthesis, and secretion in hepatocellular carcinoma cells selectively through HIF-2α (not HIF-1α) binding to the SERPINB3 promoter, in a process requiring intracellular ROS generation.","method":"Chromatin immunoprecipitation (ChIP) assay, siRNA silencing of HIF-1α and HIF-2α, hypoxia exposure of HepG2 and Huh7 cells, RT-PCR, western blot, immunohistochemistry of human HCC specimens","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP assay plus siRNA knockdown, multiple orthogonal methods","pmids":["25544768"],"is_preprint":false},{"year":2011,"finding":"The polymorphic SERPINB3 variant SCCA-PD (Gly351Ala in the reactive center loop) exhibits increased inhibitory activity against papain and cathepsin L compared to wild-type SERPINB3, and also shows a 16% higher inhibitory effect on JNK1 kinase activity at high concentration; 3D modeling indicates increased hydrophobic character at the mutation site.","method":"Kinetic analysis with recombinant proteins, in vitro protease inhibition assays, JNK1 kinase inhibition assay, crystal structure-based 3D modeling","journal":"Experimental biology and medicine","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro kinetic assay with recombinant protein plus structural modeling, single lab","pmids":["21383048"],"is_preprint":false},{"year":2014,"finding":"SERPINB3 and SERPINB4 contribute to epidermal barrier dysfunction and early inflammatory response in atopic dermatitis; Serpinb3a-null mice showed attenuated transepidermal water loss, epidermal thickening, and inflammation after allergen exposure, and SERPINB3/B4 silencing in human keratinocytes decreased S100A8 expression.","method":"Serpinb3a knockout mice, topical allergen challenge model, TEWL measurement, RNA-seq, siRNA knockdown in human keratinocytes","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function in vivo and in vitro with defined molecular readouts, multiple methods","pmids":["25111616"],"is_preprint":false},{"year":2022,"finding":"SERPINB3 protects cervical cancer cells from ionizing radiation-induced cell death by inhibiting cathepsin L-mediated lysoptosis; SERPINB3 knockout sensitizes cells to IR-induced necrotic death, and rescue with wild-type but not a reactive-site-loop mutant SERPINB3 restored protection, demonstrating the requirement for protease inhibitory activity.","method":"SERPINB3 genetic knockout, wild-type and RSL-mutant rescue, ionizing radiation treatment, cell death assays (necrosis/lysoptosis markers), transcriptomics, cathepsin L genetic studies","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1-2 — genetic KO with mutant rescue and mechanistic pathway identification, multiple methods","pmids":["35022555"],"is_preprint":false},{"year":2022,"finding":"SerpinB3 is necessary for glioblastoma cancer stem cell (CSC) maintenance, survival, and tumor growth by buffering cathepsin L-mediated cell death; SerpinB3 knockdown increased apoptosis, enhanced radiation sensitivity, and reduced tumor growth in pre-clinical models.","method":"Genetic depletion (shRNA knockdown), apoptosis assays, cathepsin L functional studies, radiation sensitivity assays, in vivo tumor growth models","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function with defined cellular phenotype and pathway identification, in vivo validation","pmids":["36103817"],"is_preprint":false},{"year":2023,"finding":"SERPINB3 inhibits the cysteine protease calpain, a key enzyme in the MYC degradation pathway, thereby stabilizing MYC and driving the basal-like/squamous transcriptional subtype and associated metabolic reprogramming (elevated carnitine/acylcarnitine and amino acid metabolism) in pancreatic cancer; SERPINB3 transgene expression enhanced in vitro invasion and promoted lung metastasis in mouse xenografts.","method":"SERPINB3 transgene overexpression, xenograft mouse model, metabolome analysis, calpain-MYC degradation pathway analysis, transcriptome analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function with defined molecular mechanism (calpain inhibition→MYC stabilization), in vivo validation, multiple methods","pmids":["37980563"],"is_preprint":false},{"year":2023,"finding":"SERPINB3 promotes immunosuppression by inducing STAT-dependent expression of chemokines CXCL1/8 and S100A8/A9, which promotes monocyte and myeloid-derived suppressor cell (MDSC) migration; intratumoral knockdown of Serpinb3a reduced MDSC and M2 macrophage infiltration, enhanced cytotoxic T cell function, and sensitized tumors to radiotherapy.","method":"RNA-seq of human cervical tumors, SERPINB3 overexpression and knockdown in cell lines and mouse tumor models, STAT inhibitor (ruxolitinib) and siRNA experiments, flow cytometry, in vitro migration assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, in vivo validation, pathway mechanism identified","pmids":["37279067"],"is_preprint":false},{"year":2019,"finding":"MiR-122 directly targets SERPINB3 mRNA; miR-122 transfection decreased SERPINB3 mRNA and protein in SERPINB3-overexpressing HepG2 cells, confirmed by luciferase reporter assay; low miR-122 levels correlate with SERPINB3 positivity and sorafenib resistance in HCC.","method":"miR-122 transfection and inhibition in hepatoma cells, luciferase reporter assay, bioinformatics, HCC rat model, human patient data","journal":"Journal of clinical medicine","confidence":"Medium","confidence_rationale":"Tier 2 — luciferase assay plus gain/loss-of-function, single lab","pmids":["30717317"],"is_preprint":false},{"year":2022,"finding":"SERPINB3 confers cisplatin resistance in HNSCC by supporting USP1-mediated deubiquitination of FANCD2-FANCI in the Fanconi anemia DNA repair pathway; downregulation of SERPINB3 reduces FANCD2-FANCI deubiquitination, impairs repair of cisplatin-induced DNA interstrand crosslinks, and enhances cisplatin-induced apoptosis.","method":"SERPINB3 knockdown and overexpression, cisplatin sensitivity assays, FANCD2-FANCI ubiquitination analysis, patient-derived xenograft model with siRNA nanoparticle delivery","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with molecular pathway identification and in vivo validation, single lab","pmids":["36382555"],"is_preprint":false},{"year":2019,"finding":"SerpinB3 acts as a paracrine mediator that differentially upregulates HIF-1α (at the transcriptional level, promoting angiogenesis and cell survival) and HIF-2α (by direct/selective NEDDylation, promoting proliferation) in hepatocellular carcinoma cells under normoxic conditions.","method":"SerpinB3 transgenic and knockout mice, hepatoma cell lines, DEN/CDAA carcinogenic mouse model, NAE1 mRNA analysis, immunohistochemistry of human HCC, NEDDylation pathway analysis","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vivo and in vitro models, single lab, pathway placement via genetic and pharmacological approaches","pmids":["31817100"],"is_preprint":false},{"year":2014,"finding":"TEAD4 transcriptionally regulates SERPINB3/B4 expression in psoriatic keratinocytes; SERPINB3/B4 depletion inhibited chemokine secretion from keratinocytes, reducing T cell migration, establishing TEAD4-SERPINB3/B4 as a regulatory axis in keratinocyte-T cell crosstalk in psoriasis.","method":"TEAD4 knockdown, SERPINB3/B4 siRNA silencing in psoriatic keratinocytes, chemokine secretion assays, T cell migration assay","journal":"Immunobiology","confidence":"Medium","confidence_rationale":"Tier 3 — functional knockdown with cellular phenotype but limited mechanistic depth, single lab","pmids":["32962824"],"is_preprint":false},{"year":2014,"finding":"SerpinB3 is expressed in hepatic progenitor cells (EpCAM-positive cells) in both fetal and adult liver, and is induced in a mouse model of liver progenitor cell activation following LPS/D-galactosamine injury, with parallel decrease in activated caspase-3.","method":"FACS sorting of EpCAM+ liver cells, immunohistochemistry, RT-PCR and sequencing in mouse model, time-course analysis","journal":"BMC cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct localization experiments with functional correlate (reduced apoptosis), single lab","pmids":["24517394"],"is_preprint":false},{"year":2014,"finding":"SerpinB3 binds to respiratory Complex I, protecting cancer cells from the pro-oxidant action of chemotherapeutic agents and contributing to drug resistance.","method":"Referenced in review (PMID 25332258) but not directly demonstrated in a primary experimental paper in this corpus","journal":"Annals of hepatology","confidence":"Low","confidence_rationale":"Tier 4 — cited in review only, no primary experimental paper in corpus","pmids":["25332258"],"is_preprint":false},{"year":2014,"finding":"Pso p27, an autoantigen in psoriasis, is generated from SCCA1 (SERPINB3) by mast cell chymase cleavage; the resulting fragments remain associated as a complex with novel immunogenic properties and increased aggregation tendency.","method":"In vitro digestion of SCCA1 with psoriatic scale extracts and purified mast cell chymase, protein characterization","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro enzymatic cleavage assay demonstrating specific post-translational processing, single lab","pmids":["24560885"],"is_preprint":false}],"current_model":"SERPINB3 (SCCA1) is a cross-class serine/cysteine protease inhibitor whose reactive site loop (RSL) is essential for inhibiting papain-like cysteine proteases (cathepsins L, S, K) and JNK1 kinase activity; beyond direct protease inhibition, SERPINB3 promotes tumor cell survival and progression through multiple mechanisms including UPR-driven NF-κB/IL-6 activation, HIF-2α-dependent NEDDylation, inhibition of calpain-mediated MYC degradation, cathepsin L/lysoptosis suppression, and STAT-dependent chemokine production that creates an immunosuppressive tumor microenvironment."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing the core enzymatic identity: SERPINB3 was shown to be a cross-class inhibitor of papain-like cysteine cathepsins (L, S, K), with the RSL as the essential determinant of target specificity, resolving how two nearly identical paralogs (SERPINB3/B4) inhibit different protease classes.","evidence":"Recombinant protein kinetics, RSL mutagenesis and domain-swap experiments between SCCA1 and SCCA2 in vitro","pmids":["9811823","9817977","9817978"],"confidence":"High","gaps":["No cellular validation of cathepsin inhibition in intact cells","Stoichiometry and kinetics of the serpin–cathepsin complex not fully resolved structurally"]},{"year":2009,"claim":"Expanding SERPINB3 function beyond protease inhibition: the crystal structure revealed that the RSL also mediates suppression of JNK1 kinase activity, but a point mutation separating protease from kinase inhibition showed the two activities are mechanistically overlapping yet distinct.","evidence":"X-ray crystallography, RCL truncation and point mutants, in vitro JNK1 kinase assay","pmids":["19166818"],"confidence":"High","gaps":["JNK1 inhibition not validated in cellular context","Binding mode of SERPINB3 to JNK1 not structurally determined","Physiological relevance of JNK1 suppression unclear"]},{"year":2010,"claim":"Linking SERPINB3 to epithelial plasticity and growth factor regulation: SERPINB3 induced EMT in hepatocytes through a protease-independent paracrine/autocrine mechanism, while separately inducing TGF-β1 expression through its protease-inhibitory RSL, demonstrating that SERPINB3 engages both protease-dependent and protease-independent pro-tumorigenic pathways.","evidence":"Stable overexpression, RSL-deleted mutant protein, invasion/migration assays, TGF-β1 mRNA/protein quantification in hepatoma cells","pmids":["20527027","20212457"],"confidence":"High","gaps":["Receptor or signaling pathway mediating protease-independent EMT not identified","TGF-β1 induction mechanism downstream of RSL not defined"]},{"year":2014,"claim":"Establishing the oncogenic signaling axis: oncogenic Ras transcriptionally upregulates SERPINB3 via PEA3, and SERPINB3 in turn inhibits protein turnover, triggers a sustained unfolded protein response (UPR), and activates NF-κB/IL-6 signaling to promote tumor growth — positioning SERPINB3 as an effector linking Ras to protumorigenic inflammation.","evidence":"Knockdown/overexpression, PEA3 reporter assays, UPR and NF-κB pathway analysis, xenograft models, human colorectal and breast cancer samples","pmids":["24759783","25213322"],"confidence":"High","gaps":["Direct UPR-activating mechanism (substrate accumulation vs. ER stress sensor engagement) not dissected","Whether NF-κB activation requires protease-inhibitory activity not tested"]},{"year":2014,"claim":"Extending SERPINB3 function to non-malignant epithelial inflammation: Serpinb3a knockout mice showed attenuated allergen-induced barrier disruption and inflammation, and SERPINB3/B4 silencing reduced S100A8 expression in keratinocytes, establishing a role in atopic dermatitis pathogenesis.","evidence":"Serpinb3a knockout mice, allergen challenge, TEWL measurement, RNA-seq, siRNA in human keratinocytes","pmids":["25111616"],"confidence":"High","gaps":["Which protease target mediates the barrier phenotype not identified","Relative contributions of SERPINB3 vs. SERPINB4 in skin barrier not resolved"]},{"year":2015,"claim":"Identifying a hypoxic regulatory circuit: HIF-2α (not HIF-1α) directly binds the SERPINB3 promoter under hypoxia in an ROS-dependent manner, and conversely SERPINB3 promotes HIF-2α stabilization via selective NEDDylation, creating a positive feedback loop in hepatocellular carcinoma.","evidence":"ChIP assay, siRNA knockdown of HIF-1α/HIF-2α, hypoxia exposure, transgenic/knockout mice, NEDDylation pathway analysis","pmids":["25544768","31817100"],"confidence":"Medium","gaps":["Mechanism by which SERPINB3 promotes NEDDylation of HIF-2α not biochemically defined","NEDDylation finding from single lab awaits independent confirmation"]},{"year":2022,"claim":"Pinpointing cathepsin L–mediated lysoptosis as a key death pathway suppressed by SERPINB3: genetic knockout sensitized cervical cancer and glioblastoma stem cells to radiation-induced necrotic/lysosomal cell death, and rescue required intact RSL protease-inhibitory activity, firmly connecting the serpin's anti-protease function to radioresistance.","evidence":"CRISPR knockout, RSL-mutant rescue, radiation sensitivity assays, cathepsin L genetic studies, shRNA in glioblastoma CSCs with in vivo tumor models","pmids":["35022555","36103817"],"confidence":"High","gaps":["Whether other lysosomal proteases contribute to lysoptosis resistance not tested","Structural basis of SERPINB3–cathepsin L complex in lysosomes not resolved"]},{"year":2022,"claim":"Revealing a DNA repair–related function: SERPINB3 supports USP1-mediated deubiquitination of FANCD2-FANCI in the Fanconi anemia pathway, thereby promoting cisplatin interstrand crosslink repair and chemoresistance in HNSCC.","evidence":"Knockdown/overexpression, FANCD2-FANCI ubiquitination analysis, cisplatin sensitivity assays, patient-derived xenograft with siRNA nanoparticles","pmids":["36382555"],"confidence":"Medium","gaps":["Direct physical interaction between SERPINB3 and USP1 not demonstrated","Whether this function requires protease-inhibitory activity not tested","Single-lab finding awaiting independent replication"]},{"year":2023,"claim":"Defining immunosuppressive and metabolic effector mechanisms: SERPINB3 inhibits calpain to stabilize MYC (driving squamous transcriptional programs and metabolic reprogramming), and independently induces STAT-dependent CXCL1/8 and S100A8/A9 to recruit MDSCs and M2 macrophages, creating an immunosuppressive tumor microenvironment.","evidence":"Transgenic overexpression, xenograft/syngeneic tumor models, metabolomics, RNA-seq, STAT inhibitor (ruxolitinib) treatment, flow cytometry of immune infiltrates","pmids":["37980563","37279067"],"confidence":"High","gaps":["Whether calpain inhibition and STAT-dependent chemokine induction are mechanistically linked or independent arms not resolved","Specific calpain isoform(s) targeted by SERPINB3 not identified"]},{"year":null,"claim":"Key open questions: the structural basis of SERPINB3 interactions with non-protease partners (JNK1, USP1/FANCD2, calpain) remains undefined; the protease-independent EMT mechanism lacks a receptor or signaling pathway; and whether the UPR, immunosuppression, and DNA repair functions are interconnected or represent parallel arms has not been tested.","evidence":"","pmids":[],"confidence":"Low","gaps":["No co-crystal structure of SERPINB3 with any non-protease partner","Protease-independent signaling pathway for EMT unidentified","Integration of UPR, immune modulation, and DNA repair functions not addressed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,8,10,12]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,10,11,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1,10]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[3,7]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,13,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,6,7,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,6,12,13,15]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[15]}],"complexes":[],"partners":["CTSL","CTSS","CTSK","MAPK8","CAPN1","MYC","FANCD2","USP1"],"other_free_text":[]},"mechanistic_narrative":"SERPINB3 (SCCA1) is a cross-class intracellular serpin that inhibits papain-like cysteine proteases and modulates kinase signaling, tumor immunity, and epithelial barrier function. Its reactive site loop (RSL) is both necessary and sufficient for inhibition of cathepsins L, S, and K, and RSL-swap experiments demonstrate that the RSL sequence dictates target specificity between SERPINB3 and its paralog SERPINB4 [PMID:9811823, PMID:9817977]; the RSL also mediates suppression of JNK1 kinase activity through a partially distinct mechanism [PMID:19166818]. In cancer, SERPINB3 promotes tumor survival by inhibiting cathepsin L–mediated lysoptosis and calpain-mediated MYC degradation, activating a sustained unfolded protein response that drives NF-κB/IL-6 signaling, and inducing STAT-dependent chemokine production (CXCL1/8, S100A8/A9) that recruits immunosuppressive myeloid cells [PMID:35022555, PMID:37980563, PMID:24759783, PMID:37279067]. SERPINB3 also contributes to epithelial barrier dysfunction and inflammatory responses in skin, as Serpinb3a-null mice show attenuated allergen-induced epidermal inflammation [PMID:25111616]."},"prefetch_data":{"uniprot":{"accession":"P29508","full_name":"Serpin B3","aliases":["Protein T4-A","Squamous cell carcinoma antigen 1","SCCA-1"],"length_aa":390,"mass_kda":44.6,"function":"May act as a papain-like cysteine protease inhibitor to modulate the host immune response against tumor cells. Also functions as an inhibitor of UV-induced apoptosis via suppression of the activity of c-Jun NH(2)-terminal kinase (JNK1)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P29508/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SERPINB3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1165,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SERPINB3","total_profiled":1310},"omim":[{"mim_id":"600518","title":"SERPIN PEPTIDASE INHIBITOR, CLADE B (OVALBUMIN), MEMBER 4; SERPINB4","url":"https://www.omim.org/entry/600518"},{"mim_id":"600517","title":"SERPIN PEPTIDASE INHIBITOR, CLADE B (OVALBUMIN), MEMBER 3; SERPINB3","url":"https://www.omim.org/entry/600517"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"cervix","ntpm":584.0},{"tissue":"esophagus","ntpm":760.5},{"tissue":"vagina","ntpm":669.9}],"url":"https://www.proteinatlas.org/search/SERPINB3"},"hgnc":{"alias_symbol":["T4-A","HsT1196"],"prev_symbol":["SCC","SCCA1"]},"alphafold":{"accession":"P29508","domains":[{"cath_id":"3.30.497.10","chopping":"4-185_290-336","consensus_level":"medium","plddt":90.5014,"start":4,"end":336},{"cath_id":"2.30.39.10","chopping":"193-288_360-388","consensus_level":"medium","plddt":94.8536,"start":193,"end":388}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P29508","model_url":"https://alphafold.ebi.ac.uk/files/AF-P29508-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P29508-F1-predicted_aligned_error_v6.png","plddt_mean":89.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SERPINB3","jax_strain_url":"https://www.jax.org/strain/search?query=SERPINB3"},"sequence":{"accession":"P29508","fasta_url":"https://rest.uniprot.org/uniprotkb/P29508.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P29508/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P29508"}},"corpus_meta":[{"pmid":"12654286","id":"PMC_12654286","title":"Insights on antibiotic resistance of Staphylococcus aureus from its whole genome: genomic island SCC.","date":"2003","source":"Drug resistance updates : reviews and commentaries in antimicrobial and anticancer chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/12654286","citation_count":270,"is_preprint":false},{"pmid":"30202019","id":"PMC_30202019","title":"The genomic landscape of cutaneous SCC reveals drivers and a novel azathioprine associated mutational signature.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/30202019","citation_count":235,"is_preprint":false},{"pmid":"3038854","id":"PMC_3038854","title":"Gene structure of human cytochrome P-450(SCC), cholesterol desmolase.","date":"1987","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/3038854","citation_count":183,"is_preprint":false},{"pmid":"21307877","id":"PMC_21307877","title":"Tumor-associated macrophages in the cutaneous SCC microenvironment are heterogeneously 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structural changes in mitochondria.","date":"2001","source":"Italian journal of anatomy and embryology = Archivio italiano di anatomia ed embriologia","url":"https://pubmed.ncbi.nlm.nih.gov/11729997","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49858,"output_tokens":5072,"usd":0.112827},"stage2":{"model":"claude-opus-4-6","input_tokens":8630,"output_tokens":2986,"usd":0.1767},"total_usd":0.289527,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"SCCA1 (SERPINB3) inhibits papain-like cysteine proteinases (cathepsins L, S, K) and this inhibitory activity is fully dependent on the reactive site loop (RSL); RSL swaps between SCCA1 and SCCA2 reversed their target specificities, demonstrating that the RSL sequence and mobility are essential for cysteine proteinase inhibition.\",\n      \"method\": \"Site-directed mutagenesis of RSL residues, RSL swap experiments between SCCA1 and SCCA2, in vitro protease inhibition assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in vitro with mutagenesis, mechanistically rigorous\",\n      \"pmids\": [\"9811823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SCCA1 (SERPINB3) is a potent cross-class inhibitor of papain-like cysteine proteinases (cathepsins L, S, K), while SCCA2 (SERPINB4) inhibits chymotrypsin-like serine proteinases (cathepsin G, mast cell chymase); the two paralogs map to 18q21.3.\",\n      \"method\": \"Biochemical analysis of recombinant SCCA1 and SCCA2 proteins; in vitro protease inhibition assays\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with recombinant proteins, replicated across labs\",\n      \"pmids\": [\"9817977\", \"9817978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of SCCA1 (SERPINB3) revealed a flexible reactive center loop (RCL) located away from the main body; truncation of the RCL abolished SCCA1's inhibitory effect on JNK1 kinase activity, and a single RCL point mutation that reduced protease inhibition retained JNK1 suppression, indicating the RCL mediates both protease and JNK1 inhibition through partially overlapping but distinct mechanisms.\",\n      \"method\": \"X-ray crystallography, RCL truncation mutants, in vitro JNK1 kinase activity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with mutagenesis and in vitro kinase assay in one study\",\n      \"pmids\": [\"19166818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SERPINB3 induces epithelial-mesenchymal transition (EMT) in HepG2 cells, characterized by reduced E-cadherin, increased beta-catenin and vimentin, loss of desmosomal junctions, and increased cell migration and invasiveness; these effects occurred at both autocrine and paracrine levels and did not require anti-protease activity, as an active-loop-deleted recombinant SERPINB3 retained EMT-inducing activity.\",\n      \"method\": \"Stable transfection of HepG2 cells with SERPINB3 gene, exogenous recombinant SERPINB3 treatment of HepG2 and MDCK cells, active-loop-deleted mutant protein, morphological/ultrastructural analysis, western blot, invasion and migration assays, soft agar colony formation\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including mutagenesis, gain-of-function, and paracrine models in one study\",\n      \"pmids\": [\"20527027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SERPINB3 modulates TGF-beta1 expression in hepatocytes; transfection with intact SERPINB3 increased TGF-beta1 mRNA and protein, and this effect required an intact reactive site loop, implicating the anti-protease activity in TGF-beta1 induction.\",\n      \"method\": \"Transfection of hepatocytes and hepatoma cell lines (HepG2, Huh7) with SERPINB3 or reactive-site-loop-deleted mutants, real-time PCR, ELISA, correlation with liver biopsy data\",\n      \"journal\": \"Laboratory investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with mutagenesis, single lab\",\n      \"pmids\": [\"20212457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Oncogenic Ras transcriptionally upregulates SERPINB3 (SCCA1) via the MAPK pathway and ETS transcription factor PEA3; elevated SCCA1 inhibits protein turnover, activates the unfolded protein response (UPR) and NF-κB, and is required for Ras-mediated cytokine production and tumor growth.\",\n      \"method\": \"Genetic knockdown and overexpression in cell lines, reporter assays for PEA3 binding, UPR markers, NF-κB assays, xenograft tumor growth assays, analysis of human colorectal and pancreatic tumor samples\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, epistasis established, replicated in human samples\",\n      \"pmids\": [\"24759783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SCCA1 (SERPINB3) promotes oncogenic transformation and EMT in mammary epithelial cells and drives a prolonged non-lethal UPR that activates NF-κB and IL-6 autocrine signaling, contributing to protumorigenic inflammation.\",\n      \"method\": \"Stable overexpression and siRNA knockdown in mammary epithelial and breast cancer cells, UPR marker analysis, NF-κB reporter assays, IL-6 ELISA, neu+ mammary tumor mouse model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including in vivo model, single lab\",\n      \"pmids\": [\"25213322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Hypoxia upregulates SERPINB3 transcription, protein synthesis, and secretion in hepatocellular carcinoma cells selectively through HIF-2α (not HIF-1α) binding to the SERPINB3 promoter, in a process requiring intracellular ROS generation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay, siRNA silencing of HIF-1α and HIF-2α, hypoxia exposure of HepG2 and Huh7 cells, RT-PCR, western blot, immunohistochemistry of human HCC specimens\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP assay plus siRNA knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"25544768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The polymorphic SERPINB3 variant SCCA-PD (Gly351Ala in the reactive center loop) exhibits increased inhibitory activity against papain and cathepsin L compared to wild-type SERPINB3, and also shows a 16% higher inhibitory effect on JNK1 kinase activity at high concentration; 3D modeling indicates increased hydrophobic character at the mutation site.\",\n      \"method\": \"Kinetic analysis with recombinant proteins, in vitro protease inhibition assays, JNK1 kinase inhibition assay, crystal structure-based 3D modeling\",\n      \"journal\": \"Experimental biology and medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinetic assay with recombinant protein plus structural modeling, single lab\",\n      \"pmids\": [\"21383048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SERPINB3 and SERPINB4 contribute to epidermal barrier dysfunction and early inflammatory response in atopic dermatitis; Serpinb3a-null mice showed attenuated transepidermal water loss, epidermal thickening, and inflammation after allergen exposure, and SERPINB3/B4 silencing in human keratinocytes decreased S100A8 expression.\",\n      \"method\": \"Serpinb3a knockout mice, topical allergen challenge model, TEWL measurement, RNA-seq, siRNA knockdown in human keratinocytes\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function in vivo and in vitro with defined molecular readouts, multiple methods\",\n      \"pmids\": [\"25111616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SERPINB3 protects cervical cancer cells from ionizing radiation-induced cell death by inhibiting cathepsin L-mediated lysoptosis; SERPINB3 knockout sensitizes cells to IR-induced necrotic death, and rescue with wild-type but not a reactive-site-loop mutant SERPINB3 restored protection, demonstrating the requirement for protease inhibitory activity.\",\n      \"method\": \"SERPINB3 genetic knockout, wild-type and RSL-mutant rescue, ionizing radiation treatment, cell death assays (necrosis/lysoptosis markers), transcriptomics, cathepsin L genetic studies\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic KO with mutant rescue and mechanistic pathway identification, multiple methods\",\n      \"pmids\": [\"35022555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SerpinB3 is necessary for glioblastoma cancer stem cell (CSC) maintenance, survival, and tumor growth by buffering cathepsin L-mediated cell death; SerpinB3 knockdown increased apoptosis, enhanced radiation sensitivity, and reduced tumor growth in pre-clinical models.\",\n      \"method\": \"Genetic depletion (shRNA knockdown), apoptosis assays, cathepsin L functional studies, radiation sensitivity assays, in vivo tumor growth models\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined cellular phenotype and pathway identification, in vivo validation\",\n      \"pmids\": [\"36103817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINB3 inhibits the cysteine protease calpain, a key enzyme in the MYC degradation pathway, thereby stabilizing MYC and driving the basal-like/squamous transcriptional subtype and associated metabolic reprogramming (elevated carnitine/acylcarnitine and amino acid metabolism) in pancreatic cancer; SERPINB3 transgene expression enhanced in vitro invasion and promoted lung metastasis in mouse xenografts.\",\n      \"method\": \"SERPINB3 transgene overexpression, xenograft mouse model, metabolome analysis, calpain-MYC degradation pathway analysis, transcriptome analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with defined molecular mechanism (calpain inhibition→MYC stabilization), in vivo validation, multiple methods\",\n      \"pmids\": [\"37980563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINB3 promotes immunosuppression by inducing STAT-dependent expression of chemokines CXCL1/8 and S100A8/A9, which promotes monocyte and myeloid-derived suppressor cell (MDSC) migration; intratumoral knockdown of Serpinb3a reduced MDSC and M2 macrophage infiltration, enhanced cytotoxic T cell function, and sensitized tumors to radiotherapy.\",\n      \"method\": \"RNA-seq of human cervical tumors, SERPINB3 overexpression and knockdown in cell lines and mouse tumor models, STAT inhibitor (ruxolitinib) and siRNA experiments, flow cytometry, in vitro migration assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, in vivo validation, pathway mechanism identified\",\n      \"pmids\": [\"37279067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MiR-122 directly targets SERPINB3 mRNA; miR-122 transfection decreased SERPINB3 mRNA and protein in SERPINB3-overexpressing HepG2 cells, confirmed by luciferase reporter assay; low miR-122 levels correlate with SERPINB3 positivity and sorafenib resistance in HCC.\",\n      \"method\": \"miR-122 transfection and inhibition in hepatoma cells, luciferase reporter assay, bioinformatics, HCC rat model, human patient data\",\n      \"journal\": \"Journal of clinical medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase assay plus gain/loss-of-function, single lab\",\n      \"pmids\": [\"30717317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SERPINB3 confers cisplatin resistance in HNSCC by supporting USP1-mediated deubiquitination of FANCD2-FANCI in the Fanconi anemia DNA repair pathway; downregulation of SERPINB3 reduces FANCD2-FANCI deubiquitination, impairs repair of cisplatin-induced DNA interstrand crosslinks, and enhances cisplatin-induced apoptosis.\",\n      \"method\": \"SERPINB3 knockdown and overexpression, cisplatin sensitivity assays, FANCD2-FANCI ubiquitination analysis, patient-derived xenograft model with siRNA nanoparticle delivery\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with molecular pathway identification and in vivo validation, single lab\",\n      \"pmids\": [\"36382555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SerpinB3 acts as a paracrine mediator that differentially upregulates HIF-1α (at the transcriptional level, promoting angiogenesis and cell survival) and HIF-2α (by direct/selective NEDDylation, promoting proliferation) in hepatocellular carcinoma cells under normoxic conditions.\",\n      \"method\": \"SerpinB3 transgenic and knockout mice, hepatoma cell lines, DEN/CDAA carcinogenic mouse model, NAE1 mRNA analysis, immunohistochemistry of human HCC, NEDDylation pathway analysis\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo and in vitro models, single lab, pathway placement via genetic and pharmacological approaches\",\n      \"pmids\": [\"31817100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TEAD4 transcriptionally regulates SERPINB3/B4 expression in psoriatic keratinocytes; SERPINB3/B4 depletion inhibited chemokine secretion from keratinocytes, reducing T cell migration, establishing TEAD4-SERPINB3/B4 as a regulatory axis in keratinocyte-T cell crosstalk in psoriasis.\",\n      \"method\": \"TEAD4 knockdown, SERPINB3/B4 siRNA silencing in psoriatic keratinocytes, chemokine secretion assays, T cell migration assay\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional knockdown with cellular phenotype but limited mechanistic depth, single lab\",\n      \"pmids\": [\"32962824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SerpinB3 is expressed in hepatic progenitor cells (EpCAM-positive cells) in both fetal and adult liver, and is induced in a mouse model of liver progenitor cell activation following LPS/D-galactosamine injury, with parallel decrease in activated caspase-3.\",\n      \"method\": \"FACS sorting of EpCAM+ liver cells, immunohistochemistry, RT-PCR and sequencing in mouse model, time-course analysis\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct localization experiments with functional correlate (reduced apoptosis), single lab\",\n      \"pmids\": [\"24517394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SerpinB3 binds to respiratory Complex I, protecting cancer cells from the pro-oxidant action of chemotherapeutic agents and contributing to drug resistance.\",\n      \"method\": \"Referenced in review (PMID 25332258) but not directly demonstrated in a primary experimental paper in this corpus\",\n      \"journal\": \"Annals of hepatology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — cited in review only, no primary experimental paper in corpus\",\n      \"pmids\": [\"25332258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Pso p27, an autoantigen in psoriasis, is generated from SCCA1 (SERPINB3) by mast cell chymase cleavage; the resulting fragments remain associated as a complex with novel immunogenic properties and increased aggregation tendency.\",\n      \"method\": \"In vitro digestion of SCCA1 with psoriatic scale extracts and purified mast cell chymase, protein characterization\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic cleavage assay demonstrating specific post-translational processing, single lab\",\n      \"pmids\": [\"24560885\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SERPINB3 (SCCA1) is a cross-class serine/cysteine protease inhibitor whose reactive site loop (RSL) is essential for inhibiting papain-like cysteine proteases (cathepsins L, S, K) and JNK1 kinase activity; beyond direct protease inhibition, SERPINB3 promotes tumor cell survival and progression through multiple mechanisms including UPR-driven NF-κB/IL-6 activation, HIF-2α-dependent NEDDylation, inhibition of calpain-mediated MYC degradation, cathepsin L/lysoptosis suppression, and STAT-dependent chemokine production that creates an immunosuppressive tumor microenvironment.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SERPINB3 (SCCA1) is a cross-class intracellular serpin that inhibits papain-like cysteine proteases and modulates kinase signaling, tumor immunity, and epithelial barrier function. Its reactive site loop (RSL) is both necessary and sufficient for inhibition of cathepsins L, S, and K, and RSL-swap experiments demonstrate that the RSL sequence dictates target specificity between SERPINB3 and its paralog SERPINB4 [PMID:9811823, PMID:9817977]; the RSL also mediates suppression of JNK1 kinase activity through a partially distinct mechanism [PMID:19166818]. In cancer, SERPINB3 promotes tumor survival by inhibiting cathepsin L–mediated lysoptosis and calpain-mediated MYC degradation, activating a sustained unfolded protein response that drives NF-κB/IL-6 signaling, and inducing STAT-dependent chemokine production (CXCL1/8, S100A8/A9) that recruits immunosuppressive myeloid cells [PMID:35022555, PMID:37980563, PMID:24759783, PMID:37279067]. SERPINB3 also contributes to epithelial barrier dysfunction and inflammatory responses in skin, as Serpinb3a-null mice show attenuated allergen-induced epidermal inflammation [PMID:25111616].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing the core enzymatic identity: SERPINB3 was shown to be a cross-class inhibitor of papain-like cysteine cathepsins (L, S, K), with the RSL as the essential determinant of target specificity, resolving how two nearly identical paralogs (SERPINB3/B4) inhibit different protease classes.\",\n      \"evidence\": \"Recombinant protein kinetics, RSL mutagenesis and domain-swap experiments between SCCA1 and SCCA2 in vitro\",\n      \"pmids\": [\"9811823\", \"9817977\", \"9817978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No cellular validation of cathepsin inhibition in intact cells\", \"Stoichiometry and kinetics of the serpin–cathepsin complex not fully resolved structurally\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Expanding SERPINB3 function beyond protease inhibition: the crystal structure revealed that the RSL also mediates suppression of JNK1 kinase activity, but a point mutation separating protease from kinase inhibition showed the two activities are mechanistically overlapping yet distinct.\",\n      \"evidence\": \"X-ray crystallography, RCL truncation and point mutants, in vitro JNK1 kinase assay\",\n      \"pmids\": [\"19166818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"JNK1 inhibition not validated in cellular context\", \"Binding mode of SERPINB3 to JNK1 not structurally determined\", \"Physiological relevance of JNK1 suppression unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linking SERPINB3 to epithelial plasticity and growth factor regulation: SERPINB3 induced EMT in hepatocytes through a protease-independent paracrine/autocrine mechanism, while separately inducing TGF-β1 expression through its protease-inhibitory RSL, demonstrating that SERPINB3 engages both protease-dependent and protease-independent pro-tumorigenic pathways.\",\n      \"evidence\": \"Stable overexpression, RSL-deleted mutant protein, invasion/migration assays, TGF-β1 mRNA/protein quantification in hepatoma cells\",\n      \"pmids\": [\"20527027\", \"20212457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor or signaling pathway mediating protease-independent EMT not identified\", \"TGF-β1 induction mechanism downstream of RSL not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Establishing the oncogenic signaling axis: oncogenic Ras transcriptionally upregulates SERPINB3 via PEA3, and SERPINB3 in turn inhibits protein turnover, triggers a sustained unfolded protein response (UPR), and activates NF-κB/IL-6 signaling to promote tumor growth — positioning SERPINB3 as an effector linking Ras to protumorigenic inflammation.\",\n      \"evidence\": \"Knockdown/overexpression, PEA3 reporter assays, UPR and NF-κB pathway analysis, xenograft models, human colorectal and breast cancer samples\",\n      \"pmids\": [\"24759783\", \"25213322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct UPR-activating mechanism (substrate accumulation vs. ER stress sensor engagement) not dissected\", \"Whether NF-κB activation requires protease-inhibitory activity not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extending SERPINB3 function to non-malignant epithelial inflammation: Serpinb3a knockout mice showed attenuated allergen-induced barrier disruption and inflammation, and SERPINB3/B4 silencing reduced S100A8 expression in keratinocytes, establishing a role in atopic dermatitis pathogenesis.\",\n      \"evidence\": \"Serpinb3a knockout mice, allergen challenge, TEWL measurement, RNA-seq, siRNA in human keratinocytes\",\n      \"pmids\": [\"25111616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which protease target mediates the barrier phenotype not identified\", \"Relative contributions of SERPINB3 vs. SERPINB4 in skin barrier not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying a hypoxic regulatory circuit: HIF-2α (not HIF-1α) directly binds the SERPINB3 promoter under hypoxia in an ROS-dependent manner, and conversely SERPINB3 promotes HIF-2α stabilization via selective NEDDylation, creating a positive feedback loop in hepatocellular carcinoma.\",\n      \"evidence\": \"ChIP assay, siRNA knockdown of HIF-1α/HIF-2α, hypoxia exposure, transgenic/knockout mice, NEDDylation pathway analysis\",\n      \"pmids\": [\"25544768\", \"31817100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which SERPINB3 promotes NEDDylation of HIF-2α not biochemically defined\", \"NEDDylation finding from single lab awaits independent confirmation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Pinpointing cathepsin L–mediated lysoptosis as a key death pathway suppressed by SERPINB3: genetic knockout sensitized cervical cancer and glioblastoma stem cells to radiation-induced necrotic/lysosomal cell death, and rescue required intact RSL protease-inhibitory activity, firmly connecting the serpin's anti-protease function to radioresistance.\",\n      \"evidence\": \"CRISPR knockout, RSL-mutant rescue, radiation sensitivity assays, cathepsin L genetic studies, shRNA in glioblastoma CSCs with in vivo tumor models\",\n      \"pmids\": [\"35022555\", \"36103817\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other lysosomal proteases contribute to lysoptosis resistance not tested\", \"Structural basis of SERPINB3–cathepsin L complex in lysosomes not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealing a DNA repair–related function: SERPINB3 supports USP1-mediated deubiquitination of FANCD2-FANCI in the Fanconi anemia pathway, thereby promoting cisplatin interstrand crosslink repair and chemoresistance in HNSCC.\",\n      \"evidence\": \"Knockdown/overexpression, FANCD2-FANCI ubiquitination analysis, cisplatin sensitivity assays, patient-derived xenograft with siRNA nanoparticles\",\n      \"pmids\": [\"36382555\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between SERPINB3 and USP1 not demonstrated\", \"Whether this function requires protease-inhibitory activity not tested\", \"Single-lab finding awaiting independent replication\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defining immunosuppressive and metabolic effector mechanisms: SERPINB3 inhibits calpain to stabilize MYC (driving squamous transcriptional programs and metabolic reprogramming), and independently induces STAT-dependent CXCL1/8 and S100A8/A9 to recruit MDSCs and M2 macrophages, creating an immunosuppressive tumor microenvironment.\",\n      \"evidence\": \"Transgenic overexpression, xenograft/syngeneic tumor models, metabolomics, RNA-seq, STAT inhibitor (ruxolitinib) treatment, flow cytometry of immune infiltrates\",\n      \"pmids\": [\"37980563\", \"37279067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether calpain inhibition and STAT-dependent chemokine induction are mechanistically linked or independent arms not resolved\", \"Specific calpain isoform(s) targeted by SERPINB3 not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions: the structural basis of SERPINB3 interactions with non-protease partners (JNK1, USP1/FANCD2, calpain) remains undefined; the protease-independent EMT mechanism lacks a receptor or signaling pathway; and whether the UPR, immunosuppression, and DNA repair functions are interconnected or represent parallel arms has not been tested.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No co-crystal structure of SERPINB3 with any non-protease partner\", \"Protease-independent signaling pathway for EMT unidentified\", \"Integration of UPR, immune modulation, and DNA repair functions not addressed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 8, 10, 12]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 10, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1, 10]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 13, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 6, 7, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 6, 12, 13, 15]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CTSL\",\n      \"CTSS\",\n      \"CTSK\",\n      \"MAPK8\",\n      \"CAPN1\",\n      \"MYC\",\n      \"FANCD2\",\n      \"USP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}