{"gene":"PRTN3","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1991,"finding":"PRTN3 (PR-3) is a serine proteinase that degrades extracellular matrix proteins including elastin, fibronectin, laminin, vitronectin, and collagen type IV, but shows no or minimal activity against interstitial collagens types I and III. It prefers small aliphatic amino acids (alanine, serine, valine) at the P1 substrate-binding site. It is inhibited by alpha-1-proteinase inhibitor and alpha-2-macroglobulin but not by alpha-1-anti-chymotrypsin or secretory leukoprotease inhibitor.","method":"In vitro enzymatic assays with chromogenic synthetic peptide substrates, insulin chain digestion, and inhibitor kinetics (ka measurements)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzymatic characterization with multiple substrates, inhibitor kinetics, and sequence homology at catalytic sites; foundational biochemical study","pmids":["2033050"],"is_preprint":false},{"year":1994,"finding":"PRTN3 (PR-3) expressed on the surface of TNF-alpha-treated endothelial cells mediates antibody-dependent cellular cytotoxicity: anti-PR-3 antibodies (C-ANCA) cause lytic activity against endothelial cells in a complement-independent manner, requiring both TNF-alpha-induced surface PR-3 expression and co-cultivation with cytokine-primed neutrophils.","method":"Cr-release cytotoxicity assay; antibody inhibition with purified antigen; co-cultivation experiments with primed neutrophils","journal":"Clinical and experimental immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional cytotoxicity assay with inhibition controls, single lab, but mechanistic readout is clear","pmids":["8082300"],"is_preprint":false},{"year":1995,"finding":"PRTN3 (PR-3) proteolytically cleaves all human IgG subclass proteins, including C-ANCA IgG complexed to the enzyme, generating cleavage products distinct from those produced by neutrophil elastase.","method":"In vitro proteolysis assay comparing PR3 and HNE cleavage products of IgG subclasses","journal":"Clinical and experimental immunology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro enzymatic assay, single lab, single method","pmids":["7621597"],"is_preprint":false},{"year":1998,"finding":"The mouse Prtn3 gene consists of five exons and four introns, is approximately 3.7 kb, maps to mouse chromosome 10C2 within 2.2 kb of the neutrophil elastase gene (Ela2), and its proximal promoter contains TATA box, c-myb, and ets transcriptional elements. The catalytic triad is conserved between mouse and human PR-3.","method":"FISH analysis for chromosomal localization; gene structure characterization by sequencing; promoter element analysis","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct FISH localization and gene structure determination, single lab, multiple methods","pmids":["9925946"],"is_preprint":false},{"year":1999,"finding":"Anti-PR-3 antibodies (C-ANCA) recognize conformational epitopes on the surface of human umbilical vein endothelial cells (HUVEC) that are distinct from PR-3 itself (HUVEC do not express PR3 mRNA by RT-PCR), suggesting cross-reactive membrane targets. The epitopes are trypsin- and formaldehyde-sensitive, consistent with conformational antigens.","method":"Fluorescent ELISA, flow cytometry, immunoprecipitation, RT-PCR for PR3 expression in HUVEC","journal":"Clinical and experimental immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods in single lab; negative RT-PCR for PR3 in HUVEC is mechanistically informative","pmids":["9933466"],"is_preprint":false},{"year":1999,"finding":"Anti-PR-3 antibodies induce endothelial IL-8 synthesis through activation of NF-kappaB, requiring cytokine-primed (TNF-alpha or IL-1beta) endothelial cells for maximal effect; cycloheximide inhibits this response.","method":"RT-PCR for IL-8 mRNA; ELISA for IL-8 protein in supernatant; PAGE/Western blot for NF-kappaB p65 nuclear translocation; cycloheximide inhibition","journal":"European journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RT-PCR, ELISA, NF-kappaB nuclear translocation), single lab","pmids":["10583443"],"is_preprint":false},{"year":2005,"finding":"Anti-PR-3 antibodies prime CD14-dependent monocyte and neutrophil activation: preincubation with anti-PR-3 antibodies markedly enhances IL-8, TNF-alpha, and IL-6 release upon subsequent LPS or LTA challenge, and this priming correlates with upregulation of CD14 expression on monocytes and neutrophils.","method":"In vitro cytokine release assay (ELISA for IL-8, TNF-alpha, IL-6); flow cytometry for CD14 surface expression; isotype-matched IgG controls","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cytokines measured, flow cytometry for mechanism, single lab","pmids":["16006536"],"is_preprint":false},{"year":2008,"finding":"Approximately half of PR3-ANCA patients have CD4+ TH1 memory T cells that respond to a complementary-PR3 peptide (cPR3(138-169)), encoded by the antisense RNA of the PRTN3 gene; cPR3-responsive T cells proliferate and secrete IFN-gamma in response to cPR3 peptide but not scrambled peptide. This response was absent in MPO-ANCA patients and correlated with anti-cPR3 antibodies.","method":"Memory T cell culture assays; T cell proliferation assay; IFN-gamma secretion measurement; specificity confirmed by absence of response to scrambled peptide and in MPO-ANCA controls","journal":"Kidney international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional T cell assays with appropriate controls, single lab, two orthogonal readouts (proliferation and cytokine)","pmids":["18596726"],"is_preprint":false},{"year":2009,"finding":"Anti-PR-3 antibodies induce neutrophil-mediated acute lung injury in isolated rat lungs via an elastase- and NADPH oxidase-derived oxygen radical-dependent mechanism: co-perfusion of TNF-primed neutrophils (surface-expressing PR-3) with monoclonal anti-PR-3 caused massive lung edema and increased endothelial permeability, which was prevented by superoxide dismutase, NADPH oxidase inhibitor, or neutrophil elastase inhibition.","method":"Isolated perfused rat lung model; measurement of lung weight gain and capillary filtration coefficient; inhibitors of reactive oxygen species and elastase","journal":"The European respiratory journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic ex vivo lung model with pharmacological inhibitors identifying downstream effectors, single lab","pmids":["20032014"],"is_preprint":false},{"year":2021,"finding":"PRTN3 (proteinase 3), together with cathepsin G and neutrophil elastase, catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN) in human peripheral blood monocytes. This histone mark is abundant in monocytes, enriched at permissive chromatin and actively transcribed genes, and is repressed as monocytes differentiate into macrophages. Simultaneous depletion of all three neutrophil serine proteases in monocytic cells results in H3ΔN loss and increased chromatin accessibility.","method":"Integrative epigenomic analysis; NSP depletion in monocytic cells; chromatin accessibility assays; primary monocyte and macrophage characterization","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct loss-of-function (NSP depletion), epigenomic readout, primary cell validation, functional chromatin consequence demonstrated","pmids":["34017121"],"is_preprint":false},{"year":2023,"finding":"A SNP (rs62132293) upstream of PRTN3 is an expression quantitative trait locus that increases leukocyte PRTN3 expression and circulating plasma PR3 levels in ANCA patients (but not healthy controls), and variant carriers with PR3-ANCA have an increased risk of disease relapse compared to MPO-ANCA carriers.","method":"Genotyping; real-time quantitative PCR of leukocyte PRTN3 expression; ELISA for plasma PR3; longitudinal follow-up for relapse","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct quantification of gene expression and protein levels by genotype, clinical correlation, single lab","pmids":["36626226"],"is_preprint":false},{"year":2023,"finding":"Fusobacterium nucleatum promotes esophageal squamous cell carcinoma proliferation by upregulating IL-32/PRTN3 expression, which activates the PI3K/AKT signaling pathway, as demonstrated in vitro and in vivo.","method":"In vitro proliferation assays; in vivo tumor models; RT-PCR and protein expression analysis of IL-32 and PRTN3; PI3K/AKT pathway activity measurement","journal":"Cancer science","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway placement suggested but mechanistic link between PRTN3 and PI3K/AKT is inferred rather than directly tested by mutagenesis or reconstitution; single lab","pmids":["36919771"],"is_preprint":false},{"year":2025,"finding":"PRTN3 in tumor-associated macrophages promotes M2 polarization and IL-33-mediated regulatory T cell differentiation to suppress antitumor immunity in lung adenocarcinoma. Mechanistically, PRTN3 upregulates IL-33 in macrophages by suppressing AKT-mediated ubiquitinated degradation of FOXO1, which then activates IL33 transcription. Myeloid-specific Prtn3 knockout in mice remodeled the immunosuppressive tumor microenvironment and enhanced anti-PD1 therapy efficacy.","method":"Myeloid-specific Prtn3 knockout mouse model; in vitro macrophage polarization assays; mechanistic studies of AKT/FOXO1/IL33 axis; flow cytometry for Tregs; anti-PD1 combination experiment","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout model with mechanistic pathway dissection (AKT/FOXO1/IL33), multiple readouts, single lab","pmids":["39993649"],"is_preprint":false}],"current_model":"PRTN3 encodes proteinase 3 (PR-3), a neutrophil serine proteinase stored in azurophil granules that degrades extracellular matrix proteins (elastin, fibronectin, laminin, vitronectin, collagen IV) with preference for small aliphatic residues at the P1 site; it is inhibited by alpha-1-proteinase inhibitor and alpha-2-macroglobulin but resists secretory leukoprotease inhibitor. Upon surface translocation on TNF-primed neutrophils or endothelial cells, PRTN3 serves as the autoantigen for C-ANCA (PR3-ANCA), and anti-PR-3 antibodies induce complement-independent endothelial cytotoxicity, NF-kappaB-driven IL-8 secretion, and CD14-dependent neutrophil/monocyte priming for bacterial ligand responses, collectively contributing to Wegener's granulomatosis/ANCA vasculitis pathology. In monocytes, PRTN3 (together with cathepsin G and neutrophil elastase) catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN), an epigenetic mark enriched at active chromatin that is repressed during monocyte-to-macrophage differentiation. In tumor-associated macrophages, PRTN3 promotes M2 polarization and IL-33-mediated regulatory T cell immunosuppression via suppression of AKT-mediated FOXO1 degradation, thereby activating IL33 transcription and restraining antitumor immunity."},"narrative":{"mechanistic_narrative":"PRTN3 encodes proteinase 3 (PR-3), a neutrophil serine proteinase that degrades extracellular matrix substrates including elastin, fibronectin, laminin, vitronectin, and collagen type IV, with a preference for small aliphatic residues at the P1 position, and is inhibited by alpha-1-proteinase inhibitor and alpha-2-macroglobulin but not by secretory leukoprotease inhibitor [PMID:2033050]. Beyond matrix proteolysis, PR-3 cleaves all human IgG subclasses, generating products distinct from those of neutrophil elastase [PMID:7621597]. When translocated to the surface of TNF-primed endothelial cells, PR-3 serves as the autoantigen for C-ANCA: anti-PR-3 antibodies drive complement-independent endothelial cytotoxicity dependent on co-cultured primed neutrophils [PMID:8082300], induce NF-kappaB-dependent endothelial IL-8 synthesis [PMID:10583443], prime CD14-dependent monocyte and neutrophil cytokine responses to bacterial ligands [PMID:16006536], and provoke neutrophil-mediated acute lung injury through elastase- and NADPH oxidase-derived oxygen radicals [PMID:20032014], collectively defining its role in ANCA-associated vasculitis pathology. Intracellularly, PR-3 acts together with cathepsin G and neutrophil elastase to proteolytically clip the histone H3 amino terminus (H3ΔN), an epigenetic mark enriched at active chromatin that is lost as monocytes differentiate into macrophages, with combined protease depletion increasing chromatin accessibility [PMID:34017121]. In tumor-associated macrophages, PRTN3 promotes M2 polarization and IL-33-driven regulatory T cell immunosuppression by suppressing AKT-mediated FOXO1 degradation to activate IL33 transcription, restraining antitumor immunity [PMID:39993649].","teleology":[{"year":1991,"claim":"Established PR-3 as a serine proteinase with defined substrate specificity and inhibitor profile, distinguishing it from other neutrophil proteases.","evidence":"In vitro enzymatic assays with chromogenic peptides, insulin chain digestion, and inhibitor kinetics","pmids":["2033050"],"confidence":"High","gaps":["No in vivo substrate validation","Physiological context of matrix degradation not addressed"]},{"year":1994,"claim":"Showed that surface-expressed PR-3 on cytokine-primed endothelium is the target of C-ANCA-mediated cytotoxicity, linking the autoantigen to vascular injury.","evidence":"Cr-release cytotoxicity assay with antibody inhibition and primed-neutrophil co-cultivation","pmids":["8082300"],"confidence":"Medium","gaps":["Mechanism of surface translocation not defined","Single lab"]},{"year":1995,"claim":"Demonstrated PR-3 cleaves IgG subclasses including complexed C-ANCA, indicating it can modify immune complexes.","evidence":"In vitro proteolysis comparing PR3 and neutrophil elastase cleavage products","pmids":["7621597"],"confidence":"Medium","gaps":["Functional consequence of IgG cleavage in vivo unknown","Single method"]},{"year":1998,"claim":"Defined the genomic structure, chromosomal location, and conserved catalytic triad of Prtn3, situating it next to the neutrophil elastase locus.","evidence":"FISH localization, gene sequencing, and promoter element analysis in mouse","pmids":["9925946"],"confidence":"Medium","gaps":["Transcriptional regulators not functionally validated","Mouse-based"]},{"year":1999,"claim":"Clarified that anti-PR-3 antibodies recognize conformational endothelial epitopes distinct from PR-3 and drive NF-kappaB-dependent IL-8 production, defining a proinflammatory signaling output.","evidence":"Flow cytometry, immunoprecipitation, RT-PCR, and NF-kappaB nuclear translocation/cycloheximide assays in HUVEC","pmids":["9933466","10583443"],"confidence":"Medium","gaps":["Identity of cross-reactive endothelial epitopes unresolved","Receptor transducing the signal not defined"]},{"year":2005,"claim":"Showed anti-PR-3 antibodies prime monocytes and neutrophils for amplified responses to bacterial ligands via CD14 upregulation, connecting autoantibodies to innate immune sensitization.","evidence":"In vitro cytokine release ELISAs and flow cytometry for CD14 with isotype controls","pmids":["16006536"],"confidence":"Medium","gaps":["Signaling pathway from antibody to CD14 induction unknown","Single lab"]},{"year":2008,"claim":"Identified a T cell arm of PR3-ANCA autoimmunity through CD4+ TH1 responses to a complementary-PR3 peptide encoded by the antisense PRTN3 RNA.","evidence":"Memory T cell proliferation and IFN-gamma assays with scrambled-peptide and MPO-ANCA controls","pmids":["18596726"],"confidence":"Medium","gaps":["In vivo pathogenicity of cPR3-reactive T cells not established","Single lab"]},{"year":2009,"claim":"Defined the downstream effectors of anti-PR-3-triggered tissue injury, implicating neutrophil elastase and NADPH oxidase-derived radicals.","evidence":"Isolated perfused rat lung model with ROS and elastase inhibitors","pmids":["20032014"],"confidence":"Medium","gaps":["Translation to chronic human vasculitis not shown","Ex vivo model"]},{"year":2021,"claim":"Revealed an intracellular, chromatin-modifying role for PR-3, acting redundantly with cathepsin G and neutrophil elastase to clip histone H3 and shape monocyte chromatin accessibility.","evidence":"Integrative epigenomics with combined NSP depletion and chromatin accessibility assays in primary monocytes/macrophages","pmids":["34017121"],"confidence":"High","gaps":["Relative contribution of PR-3 versus other NSPs not isolated","Mechanism of nuclear access not defined"]},{"year":2023,"claim":"Linked a cis-regulatory variant to elevated leukocyte PRTN3 expression, higher plasma PR3, and PR3-ANCA relapse risk, tying expression dosage to disease outcome.","evidence":"Genotyping, qPCR, plasma PR3 ELISA, and longitudinal relapse follow-up","pmids":["36626226"],"confidence":"Medium","gaps":["Causal mechanism connecting expression to relapse unproven","Single cohort"]},{"year":2025,"claim":"Established a tumor-promoting role for macrophage PRTN3 via an AKT/FOXO1/IL33 axis driving M2 polarization and Treg-mediated immunosuppression.","evidence":"Myeloid-specific Prtn3 knockout mice, macrophage polarization assays, pathway dissection, and anti-PD1 combination","pmids":["39993649"],"confidence":"Medium","gaps":["Whether PR-3 proteolytic activity is required for FOXO1 stabilization unclear","Human tumor validation limited"]},{"year":null,"claim":"How PR-3 is translocated to the cell surface and gains nuclear access to histones, and whether its catalytic activity underlies its non-proteolytic signaling roles, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined mechanism for membrane presentation","Catalytic dependence of immunomodulatory functions untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,2,9]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,6]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,6,12]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[9]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0]}],"complexes":[],"partners":["ELANE","CTSG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P24158","full_name":"Myeloblastin","aliases":["AGP7","C-ANCA antigen","Leukocyte proteinase 3","PR-3","PR3","Neutrophil proteinase 4","NP-4","P29","Wegener autoantigen"],"length_aa":256,"mass_kda":27.8,"function":"Serine protease that degrades elastin, fibronectin, laminin, vitronectin, and collagen types I, III, and IV (in vitro) (PubMed:2033050, PubMed:28240246, PubMed:3198760). By cleaving and activating receptor F2RL1/PAR-2, enhances endothelial cell barrier function and thus vascular integrity during neutrophil transendothelial migration (PubMed:23202369). Plays a role in neutrophil transendothelial migration, probably when associated with CD177 (PubMed:22266279). Triggers inflammatory processes in neutrophils by interacting with ADGRG3 upstream of F2RL1/PAR2 activation (PubMed:36302784)","subcellular_location":"Cytoplasmic granule; Secreted; Cell membrane; Membrane raft","url":"https://www.uniprot.org/uniprotkb/P24158/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRTN3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PRTN3","total_profiled":1310},"omim":[{"mim_id":"613107","title":"NEUTROPENIA, SEVERE CONGENITAL, 2, AUTOSOMAL DOMINANT; SCN2","url":"https://www.omim.org/entry/613107"},{"mim_id":"608710","title":"GRANULOMATOSIS WITH POLYANGIITIS; GPA","url":"https://www.omim.org/entry/608710"},{"mim_id":"606599","title":"THIOREDOXIN-INTERACTING PROTEIN; TXNIP","url":"https://www.omim.org/entry/606599"},{"mim_id":"606001","title":"INTERLEUKIN 32; IL32","url":"https://www.omim.org/entry/606001"},{"mim_id":"600953","title":"INTERLEUKIN 18; IL18","url":"https://www.omim.org/entry/600953"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":1978.0}],"url":"https://www.proteinatlas.org/search/PRTN3"},"hgnc":{"alias_symbol":["PR-3","ACPA","C-ANCA","AGP7","MBT","P29"],"prev_symbol":[]},"alphafold":{"accession":"P24158","domains":[{"cath_id":"2.40.10.10","chopping":"41-137_240-255","consensus_level":"medium","plddt":96.5479,"start":41,"end":255},{"cath_id":"2.40.10.10","chopping":"151-238","consensus_level":"medium","plddt":92.4467,"start":151,"end":238}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P24158","model_url":"https://alphafold.ebi.ac.uk/files/AF-P24158-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P24158-F1-predicted_aligned_error_v6.png","plddt_mean":89.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PRTN3","jax_strain_url":"https://www.jax.org/strain/search?query=PRTN3"},"sequence":{"accession":"P24158","fasta_url":"https://rest.uniprot.org/uniprotkb/P24158.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P24158/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P24158"}},"corpus_meta":[{"pmid":"16415788","id":"PMC_16415788","title":"Tudor, MBT and chromo domains gauge the degree of lysine methylation.","date":"2006","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/16415788","citation_count":385,"is_preprint":false},{"pmid":"2033050","id":"PMC_2033050","title":"Characterization of proteinase-3 (PR-3), a neutrophil serine proteinase. 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It prefers small aliphatic amino acids (alanine, serine, valine) at the P1 substrate-binding site. It is inhibited by alpha-1-proteinase inhibitor and alpha-2-macroglobulin but not by alpha-1-anti-chymotrypsin or secretory leukoprotease inhibitor.\",\n      \"method\": \"In vitro enzymatic assays with chromogenic synthetic peptide substrates, insulin chain digestion, and inhibitor kinetics (ka measurements)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzymatic characterization with multiple substrates, inhibitor kinetics, and sequence homology at catalytic sites; foundational biochemical study\",\n      \"pmids\": [\"2033050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"PRTN3 (PR-3) expressed on the surface of TNF-alpha-treated endothelial cells mediates antibody-dependent cellular cytotoxicity: anti-PR-3 antibodies (C-ANCA) cause lytic activity against endothelial cells in a complement-independent manner, requiring both TNF-alpha-induced surface PR-3 expression and co-cultivation with cytokine-primed neutrophils.\",\n      \"method\": \"Cr-release cytotoxicity assay; antibody inhibition with purified antigen; co-cultivation experiments with primed neutrophils\",\n      \"journal\": \"Clinical and experimental immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cytotoxicity assay with inhibition controls, single lab, but mechanistic readout is clear\",\n      \"pmids\": [\"8082300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"PRTN3 (PR-3) proteolytically cleaves all human IgG subclass proteins, including C-ANCA IgG complexed to the enzyme, generating cleavage products distinct from those produced by neutrophil elastase.\",\n      \"method\": \"In vitro proteolysis assay comparing PR3 and HNE cleavage products of IgG subclasses\",\n      \"journal\": \"Clinical and experimental immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro enzymatic assay, single lab, single method\",\n      \"pmids\": [\"7621597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The mouse Prtn3 gene consists of five exons and four introns, is approximately 3.7 kb, maps to mouse chromosome 10C2 within 2.2 kb of the neutrophil elastase gene (Ela2), and its proximal promoter contains TATA box, c-myb, and ets transcriptional elements. The catalytic triad is conserved between mouse and human PR-3.\",\n      \"method\": \"FISH analysis for chromosomal localization; gene structure characterization by sequencing; promoter element analysis\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct FISH localization and gene structure determination, single lab, multiple methods\",\n      \"pmids\": [\"9925946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Anti-PR-3 antibodies (C-ANCA) recognize conformational epitopes on the surface of human umbilical vein endothelial cells (HUVEC) that are distinct from PR-3 itself (HUVEC do not express PR3 mRNA by RT-PCR), suggesting cross-reactive membrane targets. The epitopes are trypsin- and formaldehyde-sensitive, consistent with conformational antigens.\",\n      \"method\": \"Fluorescent ELISA, flow cytometry, immunoprecipitation, RT-PCR for PR3 expression in HUVEC\",\n      \"journal\": \"Clinical and experimental immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods in single lab; negative RT-PCR for PR3 in HUVEC is mechanistically informative\",\n      \"pmids\": [\"9933466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Anti-PR-3 antibodies induce endothelial IL-8 synthesis through activation of NF-kappaB, requiring cytokine-primed (TNF-alpha or IL-1beta) endothelial cells for maximal effect; cycloheximide inhibits this response.\",\n      \"method\": \"RT-PCR for IL-8 mRNA; ELISA for IL-8 protein in supernatant; PAGE/Western blot for NF-kappaB p65 nuclear translocation; cycloheximide inhibition\",\n      \"journal\": \"European journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RT-PCR, ELISA, NF-kappaB nuclear translocation), single lab\",\n      \"pmids\": [\"10583443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Anti-PR-3 antibodies prime CD14-dependent monocyte and neutrophil activation: preincubation with anti-PR-3 antibodies markedly enhances IL-8, TNF-alpha, and IL-6 release upon subsequent LPS or LTA challenge, and this priming correlates with upregulation of CD14 expression on monocytes and neutrophils.\",\n      \"method\": \"In vitro cytokine release assay (ELISA for IL-8, TNF-alpha, IL-6); flow cytometry for CD14 surface expression; isotype-matched IgG controls\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cytokines measured, flow cytometry for mechanism, single lab\",\n      \"pmids\": [\"16006536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Approximately half of PR3-ANCA patients have CD4+ TH1 memory T cells that respond to a complementary-PR3 peptide (cPR3(138-169)), encoded by the antisense RNA of the PRTN3 gene; cPR3-responsive T cells proliferate and secrete IFN-gamma in response to cPR3 peptide but not scrambled peptide. This response was absent in MPO-ANCA patients and correlated with anti-cPR3 antibodies.\",\n      \"method\": \"Memory T cell culture assays; T cell proliferation assay; IFN-gamma secretion measurement; specificity confirmed by absence of response to scrambled peptide and in MPO-ANCA controls\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional T cell assays with appropriate controls, single lab, two orthogonal readouts (proliferation and cytokine)\",\n      \"pmids\": [\"18596726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Anti-PR-3 antibodies induce neutrophil-mediated acute lung injury in isolated rat lungs via an elastase- and NADPH oxidase-derived oxygen radical-dependent mechanism: co-perfusion of TNF-primed neutrophils (surface-expressing PR-3) with monoclonal anti-PR-3 caused massive lung edema and increased endothelial permeability, which was prevented by superoxide dismutase, NADPH oxidase inhibitor, or neutrophil elastase inhibition.\",\n      \"method\": \"Isolated perfused rat lung model; measurement of lung weight gain and capillary filtration coefficient; inhibitors of reactive oxygen species and elastase\",\n      \"journal\": \"The European respiratory journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic ex vivo lung model with pharmacological inhibitors identifying downstream effectors, single lab\",\n      \"pmids\": [\"20032014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRTN3 (proteinase 3), together with cathepsin G and neutrophil elastase, catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN) in human peripheral blood monocytes. This histone mark is abundant in monocytes, enriched at permissive chromatin and actively transcribed genes, and is repressed as monocytes differentiate into macrophages. Simultaneous depletion of all three neutrophil serine proteases in monocytic cells results in H3ΔN loss and increased chromatin accessibility.\",\n      \"method\": \"Integrative epigenomic analysis; NSP depletion in monocytic cells; chromatin accessibility assays; primary monocyte and macrophage characterization\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct loss-of-function (NSP depletion), epigenomic readout, primary cell validation, functional chromatin consequence demonstrated\",\n      \"pmids\": [\"34017121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A SNP (rs62132293) upstream of PRTN3 is an expression quantitative trait locus that increases leukocyte PRTN3 expression and circulating plasma PR3 levels in ANCA patients (but not healthy controls), and variant carriers with PR3-ANCA have an increased risk of disease relapse compared to MPO-ANCA carriers.\",\n      \"method\": \"Genotyping; real-time quantitative PCR of leukocyte PRTN3 expression; ELISA for plasma PR3; longitudinal follow-up for relapse\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct quantification of gene expression and protein levels by genotype, clinical correlation, single lab\",\n      \"pmids\": [\"36626226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Fusobacterium nucleatum promotes esophageal squamous cell carcinoma proliferation by upregulating IL-32/PRTN3 expression, which activates the PI3K/AKT signaling pathway, as demonstrated in vitro and in vivo.\",\n      \"method\": \"In vitro proliferation assays; in vivo tumor models; RT-PCR and protein expression analysis of IL-32 and PRTN3; PI3K/AKT pathway activity measurement\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway placement suggested but mechanistic link between PRTN3 and PI3K/AKT is inferred rather than directly tested by mutagenesis or reconstitution; single lab\",\n      \"pmids\": [\"36919771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRTN3 in tumor-associated macrophages promotes M2 polarization and IL-33-mediated regulatory T cell differentiation to suppress antitumor immunity in lung adenocarcinoma. Mechanistically, PRTN3 upregulates IL-33 in macrophages by suppressing AKT-mediated ubiquitinated degradation of FOXO1, which then activates IL33 transcription. Myeloid-specific Prtn3 knockout in mice remodeled the immunosuppressive tumor microenvironment and enhanced anti-PD1 therapy efficacy.\",\n      \"method\": \"Myeloid-specific Prtn3 knockout mouse model; in vitro macrophage polarization assays; mechanistic studies of AKT/FOXO1/IL33 axis; flow cytometry for Tregs; anti-PD1 combination experiment\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout model with mechanistic pathway dissection (AKT/FOXO1/IL33), multiple readouts, single lab\",\n      \"pmids\": [\"39993649\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRTN3 encodes proteinase 3 (PR-3), a neutrophil serine proteinase stored in azurophil granules that degrades extracellular matrix proteins (elastin, fibronectin, laminin, vitronectin, collagen IV) with preference for small aliphatic residues at the P1 site; it is inhibited by alpha-1-proteinase inhibitor and alpha-2-macroglobulin but resists secretory leukoprotease inhibitor. Upon surface translocation on TNF-primed neutrophils or endothelial cells, PRTN3 serves as the autoantigen for C-ANCA (PR3-ANCA), and anti-PR-3 antibodies induce complement-independent endothelial cytotoxicity, NF-kappaB-driven IL-8 secretion, and CD14-dependent neutrophil/monocyte priming for bacterial ligand responses, collectively contributing to Wegener's granulomatosis/ANCA vasculitis pathology. In monocytes, PRTN3 (together with cathepsin G and neutrophil elastase) catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN), an epigenetic mark enriched at active chromatin that is repressed during monocyte-to-macrophage differentiation. In tumor-associated macrophages, PRTN3 promotes M2 polarization and IL-33-mediated regulatory T cell immunosuppression via suppression of AKT-mediated FOXO1 degradation, thereby activating IL33 transcription and restraining antitumor immunity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRTN3 encodes proteinase 3 (PR-3), a neutrophil serine proteinase that degrades extracellular matrix substrates including elastin, fibronectin, laminin, vitronectin, and collagen type IV, with a preference for small aliphatic residues at the P1 position, and is inhibited by alpha-1-proteinase inhibitor and alpha-2-macroglobulin but not by secretory leukoprotease inhibitor [#0]. Beyond matrix proteolysis, PR-3 cleaves all human IgG subclasses, generating products distinct from those of neutrophil elastase [#2]. When translocated to the surface of TNF-primed endothelial cells, PR-3 serves as the autoantigen for C-ANCA: anti-PR-3 antibodies drive complement-independent endothelial cytotoxicity dependent on co-cultured primed neutrophils [#1], induce NF-kappaB-dependent endothelial IL-8 synthesis [#5], prime CD14-dependent monocyte and neutrophil cytokine responses to bacterial ligands [#6], and provoke neutrophil-mediated acute lung injury through elastase- and NADPH oxidase-derived oxygen radicals [#8], collectively defining its role in ANCA-associated vasculitis pathology. Intracellularly, PR-3 acts together with cathepsin G and neutrophil elastase to proteolytically clip the histone H3 amino terminus (H3\\u0394N), an epigenetic mark enriched at active chromatin that is lost as monocytes differentiate into macrophages, with combined protease depletion increasing chromatin accessibility [#9]. In tumor-associated macrophages, PRTN3 promotes M2 polarization and IL-33-driven regulatory T cell immunosuppression by suppressing AKT-mediated FOXO1 degradation to activate IL33 transcription, restraining antitumor immunity [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established PR-3 as a serine proteinase with defined substrate specificity and inhibitor profile, distinguishing it from other neutrophil proteases.\",\n      \"evidence\": \"In vitro enzymatic assays with chromogenic peptides, insulin chain digestion, and inhibitor kinetics\",\n      \"pmids\": [\"2033050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo substrate validation\", \"Physiological context of matrix degradation not addressed\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Showed that surface-expressed PR-3 on cytokine-primed endothelium is the target of C-ANCA-mediated cytotoxicity, linking the autoantigen to vascular injury.\",\n      \"evidence\": \"Cr-release cytotoxicity assay with antibody inhibition and primed-neutrophil co-cultivation\",\n      \"pmids\": [\"8082300\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of surface translocation not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Demonstrated PR-3 cleaves IgG subclasses including complexed C-ANCA, indicating it can modify immune complexes.\",\n      \"evidence\": \"In vitro proteolysis comparing PR3 and neutrophil elastase cleavage products\",\n      \"pmids\": [\"7621597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of IgG cleavage in vivo unknown\", \"Single method\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the genomic structure, chromosomal location, and conserved catalytic triad of Prtn3, situating it next to the neutrophil elastase locus.\",\n      \"evidence\": \"FISH localization, gene sequencing, and promoter element analysis in mouse\",\n      \"pmids\": [\"9925946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional regulators not functionally validated\", \"Mouse-based\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Clarified that anti-PR-3 antibodies recognize conformational endothelial epitopes distinct from PR-3 and drive NF-kappaB-dependent IL-8 production, defining a proinflammatory signaling output.\",\n      \"evidence\": \"Flow cytometry, immunoprecipitation, RT-PCR, and NF-kappaB nuclear translocation/cycloheximide assays in HUVEC\",\n      \"pmids\": [\"9933466\", \"10583443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of cross-reactive endothelial epitopes unresolved\", \"Receptor transducing the signal not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed anti-PR-3 antibodies prime monocytes and neutrophils for amplified responses to bacterial ligands via CD14 upregulation, connecting autoantibodies to innate immune sensitization.\",\n      \"evidence\": \"In vitro cytokine release ELISAs and flow cytometry for CD14 with isotype controls\",\n      \"pmids\": [\"16006536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signaling pathway from antibody to CD14 induction unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified a T cell arm of PR3-ANCA autoimmunity through CD4+ TH1 responses to a complementary-PR3 peptide encoded by the antisense PRTN3 RNA.\",\n      \"evidence\": \"Memory T cell proliferation and IFN-gamma assays with scrambled-peptide and MPO-ANCA controls\",\n      \"pmids\": [\"18596726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo pathogenicity of cPR3-reactive T cells not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the downstream effectors of anti-PR-3-triggered tissue injury, implicating neutrophil elastase and NADPH oxidase-derived radicals.\",\n      \"evidence\": \"Isolated perfused rat lung model with ROS and elastase inhibitors\",\n      \"pmids\": [\"20032014\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Translation to chronic human vasculitis not shown\", \"Ex vivo model\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed an intracellular, chromatin-modifying role for PR-3, acting redundantly with cathepsin G and neutrophil elastase to clip histone H3 and shape monocyte chromatin accessibility.\",\n      \"evidence\": \"Integrative epigenomics with combined NSP depletion and chromatin accessibility assays in primary monocytes/macrophages\",\n      \"pmids\": [\"34017121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of PR-3 versus other NSPs not isolated\", \"Mechanism of nuclear access not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked a cis-regulatory variant to elevated leukocyte PRTN3 expression, higher plasma PR3, and PR3-ANCA relapse risk, tying expression dosage to disease outcome.\",\n      \"evidence\": \"Genotyping, qPCR, plasma PR3 ELISA, and longitudinal relapse follow-up\",\n      \"pmids\": [\"36626226\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal mechanism connecting expression to relapse unproven\", \"Single cohort\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a tumor-promoting role for macrophage PRTN3 via an AKT/FOXO1/IL33 axis driving M2 polarization and Treg-mediated immunosuppression.\",\n      \"evidence\": \"Myeloid-specific Prtn3 knockout mice, macrophage polarization assays, pathway dissection, and anti-PD1 combination\",\n      \"pmids\": [\"39993649\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PR-3 proteolytic activity is required for FOXO1 stabilization unclear\", \"Human tumor validation limited\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PR-3 is translocated to the cell surface and gains nuclear access to histones, and whether its catalytic activity underlies its non-proteolytic signaling roles, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined mechanism for membrane presentation\", \"Catalytic dependence of immunomodulatory functions untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 2, 9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 6, 12]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ELANE\", \"CTSG\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}