{"gene":"SERPINA3","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":2008,"finding":"Nur77 (nuclear receptor NR4A1) directly transactivates the SERPINA3 gene by binding to a Nur77 responsive element (NBRE) located at -182 to -175 in the SERPINA3 promoter, as demonstrated by electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), and luciferase reporter assays; Nur77 overexpression increased SERPINA3 expression while RNA interference-mediated knockdown of Nur77 decreased it.","method":"EMSA, ChIP, luciferase reporter assay, RNA interference knockdown and overexpression in HEK293T and HepG2 cells","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (EMSA in vitro binding, ChIP in vivo binding, luciferase reporter, gain- and loss-of-function), single lab","pmids":["18248459"],"is_preprint":false},{"year":2017,"finding":"STAT3 directly drives SERPINA3 transcription in melanoma cells; STAT3 binds the SERPINA3 promoter (validated by ChIP-qPCR), and STAT3 knockdown reduces SERPINA3 expression and impairs melanoma cell migration and invasion.","method":"ChIP-qPCR, RNA interference (STAT3 knockdown), global and JAK/STAT-specific gene expression profiling, migration/invasion functional assays","journal":"Laboratory investigation; a journal of technical methods and pathology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP-qPCR confirms direct promoter binding, combined with gene expression profiling and functional rescue assays, single lab","pmids":["31278347"],"is_preprint":false},{"year":2017,"finding":"ApoA4 stimulates SERPINA3 gene expression in hepatocytes via the nuclear receptors NR4A1 and NR1D1, which bind the SERPINA3 promoter; this was verified by ChIP, luciferase reporter assay, and RNA interference-mediated knockdown of NR4A1 or NR1D1.","method":"ChIP, luciferase reporter assay, siRNA knockdown of NR4A1/NR1D1, in vivo and in vitro expression analysis","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (ChIP, reporter assay, RNAi knockdown) in single lab, in vivo confirmation","pmids":["28412351"],"is_preprint":false},{"year":2019,"finding":"SERPINA3 interacts with heterogeneous nuclear ribonucleoprotein K (HNRNP-K) under oxidative stress (H2O2 exposure); the SERPINA3-HNRNP-K complex enhances promoter activity and transcript levels of POT1, UHRF1, and HIST2H2BE. The amount of co-immunoprecipitated HNRNP-K correlates with the level of SERPINA3 oxidation; inhibition of SERPINA3 oxidation suppressed transcriptional activity of the complex.","method":"Co-immunoprecipitation (Co-IP), promoter activity assays, transcript quantification, correlative analysis of SERPINA3 oxidation status in HCC tissues","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus functional promoter assays, single lab, oxidation inhibition experiment corroborates mechanism","pmids":["31121493"],"is_preprint":false},{"year":2012,"finding":"The SERPINA3 promoter is transcriptionally activated by the transcription factors SP1, MZF1, and ZBTB7B; the level of activation is allele-dependent (rs1884082 SNP), with the T allele induced more strongly than the G allele; when the promoter was methylated, ZBTB7B response became allele-specific. Overexpression of SERPINA3 in JEG-3 trophoblast cells decreased cell adhesion to extracellular matrix and neighboring cells but protected cells from apoptosis.","method":"Luciferase reporter assay with methylated/unmethylated promoter constructs, transfection of transcription factors, SNP allelic comparison, SERPINA3 overexpression in JEG-3 cells with adhesion and apoptosis assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus functional overexpression with defined phenotypic readout, single lab with multiple orthogonal approaches","pmids":["22246292"],"is_preprint":false},{"year":2023,"finding":"SERPINA3 variants identified in generalized pustular psoriasis (GPP) impair cathepsin G inhibitory function: one deletion variant (c.1246_1247del) produces a mutant protein that is not secreted and thus cannot inhibit cathepsin G; two missense variants reduce the ability of ACT (SERPINA3 protein) to inhibit cathepsin G enzymatic activity in functional assays.","method":"Next-generation sequencing, bioinformatic analysis, secretion assay of mutant vs wild-type SERPINA3, cathepsin G enzymatic inhibition assay with mutant proteins","journal":"Journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct enzymatic inhibition assay with patient-derived variants plus secretion functional test, single lab, multiple variants tested","pmids":["36828876"],"is_preprint":false},{"year":2021,"finding":"Polymorphic SERPINA3 (I308T variant, rs142398813, and SAMP8-type Serpina3) prolongs the oligomeric state of Aβ42 peptide compared to wild-type SERPINA3, resulting in sustained oligomeric forms (trimers, tetramers) and increased neuronal cell death in SH-SY5Y cells; wild-type SERPINA3 accelerates Aβ42 fibrillization as a molecular chaperone.","method":"Transmission electron microscopy (TEM), Western blot (oligomer detection), thioflavin T assay, SH-SY5Y neuroblastoma cell death assay, comparison of recombinant wild-type vs polymorphic SERPINA3 proteins","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution with recombinant proteins, multiple assays (TEM, WB, ThT, cell death), single lab","pmids":["33662018"],"is_preprint":false},{"year":2021,"finding":"Polymorphic SERPINA3-R124C acts as a 'benign chaperone' that shortens the lifetime of small soluble Aβ42 oligomers and converts Aβ42 into high-molecular aggregates more rapidly than wild-type SERPINA3, resulting in less cytotoxicity to SH-SY5Y cells compared to Aβ42 preincubated with wild-type SERPINA3.","method":"Transmission electron microscopy, thioflavin T assay, Western blot, SH-SY5Y cell viability assay with recombinant wild-type vs R124C SERPINA3","journal":"Bioscience, biotechnology, and biochemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution with purified proteins, multiple orthogonal biophysical and cellular assays, single lab","pmids":["34077500"],"is_preprint":false},{"year":2022,"finding":"Serpina3c/k (murine ortholog) is glycosylated at multiple N-glycosylation sites; during cellular stress (H2O2 or starvation), serpina3c/k secretion is increased and the secreted protein exhibits higher molecular weight. Site-directed mutagenesis of all four glycosylation sites (quadruple mutant) abolishes stress-induced secretion increase. In chronic kidney disease, serpina3c/k relocates from the cytoplasm to the apical tubular membrane.","method":"FLAG-tagged transfection, glycanase treatment, site-directed mutagenesis of glycosylation sites, Western blot, immunofluorescence/fractionation in kidney cells, in vivo rat acute kidney injury model","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-directed mutagenesis of each glycosylation site combined with secretion assays and subcellular localization, in vitro and in vivo validation, single lab","pmids":["35147994"],"is_preprint":false},{"year":2018,"finding":"SERPINA3 silencing in high-metastatic colon cancer cells (HT-29LMM, KM-12L4) reduced cell migration and invasion in vitro and decreased expression of MMP-2 and MMP-9; in vivo, SERPINA3 siRNA reduced liver metastasis in mice and down-regulated Mmp-2, Mmp-9, and PCNA in metastatic lesions.","method":"siRNA knockdown, wound-healing assay, Transwell invasion assay, ELISA for MMP-2/MMP-9, in vivo mouse liver metastasis model with immunohistochemistry","journal":"Digestive diseases and sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in vitro and in vivo with defined mechanistic readout (MMP expression), single lab","pmids":["29855767"],"is_preprint":false},{"year":2013,"finding":"SERPINA3 promotes endometrial cancer cell proliferation by regulating G2/M cell cycle checkpoint and inhibiting apoptosis; the pro-proliferative effect is associated with activation of MAPK/ERK1/2 and PI3K/AKT signaling pathways.","method":"SERPINA3 gain- and loss-of-function in endometrial cancer cell lines, cell cycle analysis, apoptosis assay, Western blot for ERK1/2 and AKT phosphorylation","journal":"International journal of clinical and experimental pathology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional assays with pathway readout (MAPK/ERK, PI3K/AKT), single lab","pmids":["24817931"],"is_preprint":false},{"year":2022,"finding":"SERPINA3 overexpression in human neocortical development promotes outer radial glia (oRG) proliferation and increases upper-layer neurons, inducing cortical folding; downstream target Glo1 is involved, with SERPINA3 binding to the Glo1 promoter. Knock-in mice overexpressing SERPINA3 showed enhanced cognitive abilities.","method":"Overexpression in mouse brain (in vivo), quantification of oRG cells and neuron numbers, ChIP to demonstrate SERPINA3 binding to Glo1 promoter, knock-in mouse behavioral testing","journal":"Cell discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo overexpression with cellular phenotype and ChIP evidence of promoter binding; single lab, novel and unusual mechanism for a serpin","pmids":["36414636"],"is_preprint":false},{"year":2023,"finding":"SERPINA3 knockdown in vascular smooth muscle cells (RASMCs) attenuates proliferation and migration, and inhibits phosphorylation of IκBα and its downstream NF-κB pathway; secreted SERPINA3 protein increases expression of inflammatory factors in HUVECs.","method":"siRNA knockdown in RASMCs, EdU proliferation assay, scratch migration assay, Western blot for phospho-IκBα/NF-κB, recombinant SERPINA3 protein stimulation of HUVECs with RT-PCR for inflammatory factors","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function with pathway readout (NF-κB) and gain-of-function with secreted protein, single lab","pmids":["34957248"],"is_preprint":false},{"year":2023,"finding":"SERPINA3 overexpression in lung cancer cells inhibits NF-κB signaling by upregulating SPOP (speckle-type POZ protein), which in turn suppresses NF-κB p65; identified by data-independent acquisition mass spectrometry and validated by Western blot in cell lines and xenograft tumors.","method":"DIA mass spectrometry proteomics, SERPINA3 overexpression, Western blot validation of SPOP and NF-κB p65, xenograft mouse model","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics discovery plus Western blot and in vivo validation, single lab","pmids":["37417362"],"is_preprint":false},{"year":2023,"finding":"SERPINA3 inhibits cathepsin G (CTSG)-mediated cleavage of the anti-apoptotic protein 14-3-3ε in liver cancer cells, thereby protecting cells from neutrophil extracellular trap (NET)-induced apoptosis; NF-κB (p65) directly binds the SERPINA3 promoter to govern its expression in liver cancer.","method":"siRNA knockdown of SERPINA3, Western blot for 14-3-3ε cleavage, ChIP for p65 binding to SERPINA3 promoter, cell viability/apoptosis assays, antisense oligonucleotide targeting of SERPINA3","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mechanistic reconstitution (CTSG-14-3-3ε cleavage blocked by SERPINA3), ChIP for transcriptional regulation, siRNA and ASO loss-of-function with defined molecular readout, single lab","pmids":["41653436"],"is_preprint":false},{"year":2024,"finding":"SERPINA3 is required for chondrogenic differentiation: its expression is markedly induced at early time points during in vitro chondrogenesis; siRNA silencing of SERPINA3 reduces cartilage pellet size, proteoglycan content, and downregulates ECM formation genes; SERPINA3 silencing markedly reduces SOX9 protein levels at early time points, suggesting SERPINA3 regulates the master transcriptional regulator SOX9 of chondrogenesis. The effect is specific to chondrogenesis (not osteogenesis).","method":"siRNA knockdown during in vitro chondrogenesis, RNA sequencing, DMMB assay, safranin-O staining, Western blot for SOX9, comparison with osteogenesis","journal":"Matrix biology : journal of the International Society for Matrix Biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — loss-of-function with RNA-seq plus multiple orthogonal readouts (histology, biochemical assay, protein quantification), specificity demonstrated by negative result in osteogenesis, single lab","pmids":["39097037"],"is_preprint":false},{"year":2025,"finding":"KCTD17 regulates SERPINA3 (murine Serpina3k) expression by facilitating ubiquitin-mediated degradation of Zbtb7b (a transcriptional activator of SERPINA3); KCTD17 depletion increases SERPINA3/Serpina3k levels. Increased SERPINA3 reduces liver fibrosis in MASH by inhibiting Par2/TGFβ-mediated activation of hepatic stellate cells. Pharmacological inhibition of Kctd17 reverses MASH-induced liver fibrosis in mice.","method":"KCTD17 depletion in mouse models, ubiquitin-mediated degradation assay for Zbtb7b, measurement of SERPINA3/Serpina3k secretion, hepatic stellate cell activation assays (Par2/TGFβ pathway), dietary rodent MASH models, pharmacological inhibition in vivo","journal":"Experimental & molecular medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mechanistic dissection of ubiquitin degradation pathway, downstream stellate cell activation assay, in vivo pharmacological intervention, single lab","pmids":["40744994"],"is_preprint":false},{"year":2025,"finding":"Nur77 (NR4A1) promotes SERPINA3 transcription by binding to the SERPINA3 promoter region (-182 to -175), upregulating SERPINA3 expression and activating the Wnt/β-catenin pathway; SERPINA3 knockdown alleviates cisplatin-induced HK-2 cell injury (increased viability/proliferation, decreased apoptosis and inflammation); the protective effect of Nur77 knockdown is antagonized by SERPINA3 overexpression.","method":"ChIP assay, dual-luciferase reporter assay, siRNA knockdown of Nur77 and SERPINA3, SERPINA3 overexpression rescue, flow cytometry for apoptosis, ELISA for cytokines","journal":"Nephrology (Carlton, Vic.)","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP plus reporter assay confirm direct binding; epistasis by rescue experiment; single lab","pmids":["39957271"],"is_preprint":false},{"year":2023,"finding":"SERPINA3 overexpression activates Wnt/β-catenin signaling to protect bladder epithelial cells (HBlEpCs) from apoptosis and promote cell growth; inhibition of Wnt/β-catenin with XAV-939 abolished the protective effect of serpina3n overexpression against cyclophosphamide-induced cystitis.","method":"Serpina3n overexpression in mouse IC/BPS model and HBlEpC cells, CCK-8/flow cytometry assays, Western blot for β-catenin, pharmacological inhibition (XAV-939) as epistasis test","journal":"International urology and nephrology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain-of-function with pathway inhibitor epistasis test, in vivo and in vitro, single lab","pmids":["37594700"],"is_preprint":false},{"year":2024,"finding":"LAMB3 upregulates SERPINA3 expression to promote intestinal inflammation via the integrin α3β1/FAK pathway; RNA sequencing and replenishment experiments showed that SERPINA3 is a downstream effector of LAMB3 in IBD intestinal epithelial cells.","method":"RNA sequencing after LAMB3 knockdown, replenishment (rescue) experiment with SERPINA3 re-expression, RT-qPCR, Western blot, dual-luciferase and ChIP-qPCR for LAMB3 regulation by p65","journal":"Inflammatory bowel diseases","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — RNA-seq plus rescue experiment places SERPINA3 downstream of LAMB3/integrin α3β1/FAK, single lab","pmids":["37454278"],"is_preprint":false},{"year":2025,"finding":"SERPINA3 promotes cell proliferation, wound healing, and activates ERK and AKT signaling pathways in human dermal fibroblasts; SERPINA3 expression is downregulated in aged fibroblasts and further reduced by oxidative stress.","method":"RNA-seq analysis of aged fibroblasts, SERPINA3 gain/loss-of-function, proliferation and wound-healing assays, Western blot for ERK and AKT phosphorylation","journal":"BMB reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional assays with pathway readout but single lab, limited mechanistic depth in abstract","pmids":["40495483"],"is_preprint":false},{"year":2024,"finding":"SERPINA3 downregulation contributes to aromatase inhibitor (AI) resistance in ER-positive breast cancer; ANKRD11 functions as a downstream effector of SERPINA3 and induces AI insensitivity by interacting with and activating HDAC3. HDAC3 inhibition reverses AI resistance associated with decreased SERPINA3 and increased ANKRD11.","method":"Dataset screening (5 datasets), SERPINA3 knockdown/overexpression in cell lines, Co-IP for ANKRD11-HDAC3 interaction, HDAC3 activity assay, HDAC3 inhibitor rescue","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for protein interaction plus enzymatic activity assay and pharmacological rescue, single lab","pmids":["37414914"],"is_preprint":false},{"year":2024,"finding":"SERPINA3 and LCN2 are upregulated in osteoblastic prostate cancer (BPCa) cells via osteoblast-derived extracellular vesicles in a co-culture system; enhanced expression of SERPINA3 and LCN2 promotes osteogenesis and suppresses BPCa cell proliferation in co-culture and mouse xenograft models.","method":"OB-BPCa co-culture system, extracellular vesicle-mediated transfer assay, xenograft mouse experiments with intracaudal injection, proliferation assays","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-culture with EV-transfer mechanism and in vivo xenograft validation, single lab","pmids":["37408474"],"is_preprint":false},{"year":2023,"finding":"SerpinA3 promotes myocardial ischemia-reperfusion injury by activating NF-κB signaling: SerpinA3 knockdown inhibited p65 phosphorylation in myocardial tissues and reduced H2O2-induced inflammation, oxidative stress, and apoptosis in cardiomyocytes in vitro and improved cardiac function in vivo.","method":"siRNA knockdown of SerpinA3 in rat IR model and in vitro H2O2 model, Western blot for p65 phosphorylation, flow cytometry/TUNEL for apoptosis, cardiac function measurements","journal":"Molecular biotechnology","confidence":"Low","confidence_rationale":"Tier 2–3 / Weak — loss-of-function with NF-κB pathway readout but the paper itself notes the exact mechanism remains 'untested'; single lab","pmids":["38006519"],"is_preprint":false},{"year":2025,"finding":"SERPINA3 overexpression in prostate cancer cells activates IL-17 and TNFα signaling pathways by promoting CXCL2 expression, thereby increasing M1 macrophage recruitment into the tumor microenvironment and inhibiting cancer cell proliferation and invasion.","method":"Colony formation assay, Transwell assay, subcutaneous xenograft in mice, pathway analysis by RNA-seq/Western blot, CXCL2 expression measurement","journal":"Brazilian journal of medical and biological research","confidence":"Low","confidence_rationale":"Tier 2–3 / Weak — functional assays and pathway identification, single lab, limited mechanistic depth on direct interaction","pmids":["40367014"],"is_preprint":false},{"year":2023,"finding":"CTSC (cathepsin C) induces SERPINA3 expression in glioma cells via STAT3 signaling: CTSC activates STAT3, which mediates upregulation of SERPINA3 expression, and the CTSC/STAT3/SERPINA3 axis promotes glioma cell migration, invasion, and EMT.","method":"Transwell assay, RT-qPCR, Western blot for STAT3 and SERPINA3, CTSC overexpression/knockdown in glioma cells","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway placement by expression analysis and knockdown, single lab, limited mechanistic depth on direct interaction","pmids":["37925117"],"is_preprint":false},{"year":2024,"finding":"SERPINA3 is expressed by a SERPINA3+ reactive astrocyte subtype (Ast.5) specifically enriched in the vicinity of neuritic amyloid plaques in human neocortex, as identified by spatial transcriptomics and validated at the protein level by immunofluorescence co-registered with immunohistochemistry.","method":"Spatial transcriptomics with distance-based analytic strategy, immunohistochemistry, immunofluorescence protein-level validation","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization study (spatial transcriptomics + IHC), no direct functional experiment on SERPINA3, preprint","pmids":["39605680"],"is_preprint":true},{"year":2025,"finding":"Brain-specific SERPINA3N (murine) overexpression does not alter neuronal or glial development under homeostasis; however, under pathological conditions, SERPINA3N overexpression drives a pro-inflammatory response to brain injury, exacerbates blood-brain barrier dysfunction, promotes neurodegeneration through apoptotic neuronal loss, and disrupts oligodendroglial differentiation and myelination following neonatal brain injury.","method":"Brain-specific genetic overexpression tools in mice, neonatal brain injury model, cellular markers for neurons/glia/oligodendrocytes, BBB permeability assays, apoptosis assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific genetic tools in vivo with multiple cellular readouts; preprint but rigorous experimental design","pmids":["bio_10.1101_2025.09.09.675167"],"is_preprint":true}],"current_model":"SERPINA3 (alpha-1-antichymotrypsin) is a secreted serine protease inhibitor whose primary enzymatic function is to inhibit cathepsin G (and related chymotrypsin-like proteases); its transcription is directly activated by nuclear receptors Nur77/NR4A1, NR1D1, and STAT3 binding to defined promoter elements, and modulated by methylation-sensitive transcription factors SP1/MZF1/ZBTB7B; intracellularly, under oxidative stress it forms a complex with HNRNP-K to regulate transcription of telomere and HCC-promoting genes; it acts as a molecular chaperone modulating Aβ42 oligomerization in a polymorphism-dependent manner; it plays a non-redundant role in chondrogenesis by maintaining SOX9 protein levels; and depending on cellular context it activates or suppresses NF-κB, PI3K/AKT, MAPK/ERK, or Wnt/β-catenin signaling to regulate apoptosis, migration, invasion, and inflammation across multiple tissue types."},"narrative":{"mechanistic_narrative":"SERPINA3 (alpha-1-antichymotrypsin) is a secreted serine protease inhibitor whose canonical activity is the inhibition of cathepsin G, and whose dysregulation across many tissue contexts links it to inflammation, cancer progression, and developmental programs [PMID:36828876, PMID:41653436]. Its protease-inhibitory function is direct and physiologically consequential: SERPINA3 blocks cathepsin G-mediated cleavage of the anti-apoptotic protein 14-3-3ε, shielding liver cancer cells from neutrophil extracellular trap-induced apoptosis [PMID:41653436], and disease-associated variants in generalized pustular psoriasis either abolish secretion or weaken cathepsin G inhibition [PMID:36828876]. SERPINA3 transcription is governed by a convergent set of inducible factors that bind its promoter—Nur77/NR4A1 at a defined NBRE (-182/-175), NR1D1, STAT3, NF-κB p65, and the methylation-sensitive activators SP1/MZF1/ZBTB7B—integrating nuclear-receptor, cytokine, and inflammatory inputs [PMID:18248459, PMID:31278347, PMID:28412351, PMID:22246292, PMID:41653436, PMID:39957271]; ZBTB7B-driven expression is further set by KCTD17-mediated ubiquitin degradation of the activator [PMID:40744994]. Beyond its secreted role, SERPINA3 functions intracellularly: under oxidative stress its oxidized form complexes with HNRNP-K to drive transcription of POT1, UHRF1 and HIST2H2BE [PMID:31121493], it binds the Glo1 promoter to expand outer radial glia and promote cortical folding [PMID:36414636], and it is required for chondrogenesis by maintaining SOX9 protein levels [PMID:39097037]. As a context-dependent signaling modulator, SERPINA3 activates or suppresses NF-κB (in part via SPOP-mediated repression of p65), PI3K/AKT, MAPK/ERK, and Wnt/β-catenin pathways to control proliferation, migration, invasion, and apoptosis [PMID:24817931, PMID:34957248, PMID:37417362, PMID:39957271, PMID:37594700]. It also acts as an extracellular chaperone of amyloid-β42, where wild-type protein accelerates fibrillization while disease-linked polymorphisms alter oligomer lifetimes and neuronal cytotoxicity [PMID:33662018, PMID:34077500].","teleology":[{"year":2008,"claim":"Established the first defined transcriptional control element of SERPINA3, answering how its expression is switched on by a nuclear receptor.","evidence":"EMSA, ChIP, luciferase reporter and Nur77 gain/loss-of-function in HEK293T and HepG2 cells","pmids":["18248459"],"confidence":"High","gaps":["Does not connect Nur77-driven SERPINA3 to a downstream physiological output","Other promoter elements not yet mapped"]},{"year":2012,"claim":"Showed SERPINA3 promoter activity is allele- and methylation-dependent through SP1/MZF1/ZBTB7B, and linked its overexpression to reduced adhesion and apoptosis resistance.","evidence":"Luciferase reporter with methylated/unmethylated constructs, SNP allelic comparison, and overexpression with adhesion/apoptosis assays in JEG-3 trophoblasts","pmids":["22246292"],"confidence":"Medium","gaps":["Functional readout limited to one trophoblast line","Mechanism linking adhesion/apoptosis phenotype to protease inhibition unresolved"]},{"year":2017,"claim":"Expanded the transcriptional network by placing STAT3 and a NR4A1/NR1D1 nuclear-receptor axis upstream of SERPINA3 in distinct tissues.","evidence":"ChIP/ChIP-qPCR, luciferase reporter, RNAi knockdown, and migration/invasion assays in melanoma and hepatocytes","pmids":["31278347","28412351"],"confidence":"High","gaps":["Whether these factors act combinatorially on the same promoter is untested","Cell-type specificity of each input not reconciled"]},{"year":2019,"claim":"Revealed an unexpected intracellular, redox-gated role: oxidized SERPINA3 complexes with HNRNP-K to drive transcription of telomere and HCC-promoting genes.","evidence":"Co-IP, promoter activity and transcript assays with oxidation-status correlation in HCC tissue","pmids":["31121493"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation of the complex","Mechanism of nuclear entry of a secreted serpin unexplained"]},{"year":2021,"claim":"Defined SERPINA3 as an amyloid-β42 chaperone whose effect on oligomer lifetime and neurotoxicity is dictated by sequence polymorphism.","evidence":"Recombinant wild-type vs variant protein with TEM, thioflavin T, Western blot, and SH-SY5Y cell-death assays","pmids":["33662018","34077500"],"confidence":"Medium","gaps":["In vitro reconstitution only; no in vivo amyloid pathology test","Structural basis of polymorphism-dependent chaperoning not determined"]},{"year":2022,"claim":"Demonstrated that glycosylation controls stress-induced SERPINA3 secretion and that it relocates to apical tubular membranes in kidney disease, linking post-translational modification to its trafficking.","evidence":"Site-directed mutagenesis of glycosylation sites, glycanase treatment, secretion and localization assays in vitro and rat AKI model (murine ortholog)","pmids":["35147994"],"confidence":"High","gaps":["Functional consequence of membrane relocation untested","Conducted on murine ortholog"]},{"year":2022,"claim":"Uncovered a developmental nuclear function in which SERPINA3 binds the Glo1 promoter to expand outer radial glia and induce human-type cortical folding.","evidence":"In vivo overexpression in mouse brain, oRG/neuron quantification, ChIP for Glo1 promoter binding, and knock-in behavioral testing","pmids":["36414636"],"confidence":"Medium","gaps":["How a secreted serpin engages a promoter is mechanistically unresolved","Glo1 as the sole effector not established"]},{"year":2023,"claim":"Provided the clearest enzymatic-to-phenotype chain: SERPINA3 inhibits cathepsin G cleavage of 14-3-3ε to protect cancer cells from NET-induced death, with NF-κB p65 driving its expression.","evidence":"siRNA/ASO knockdown, Western blot for 14-3-3ε cleavage, ChIP for p65 binding, and apoptosis assays in liver cancer","pmids":["41653436"],"confidence":"High","gaps":["Whether this mechanism generalizes beyond liver cancer untested","Stoichiometry of SERPINA3-cathepsin G inhibition in this context not quantified"]},{"year":2023,"claim":"Established SERPINA3 as a bidirectional signaling modulator across vascular, lung, urological, and cardiac systems, activating or suppressing NF-κB, Wnt/β-catenin, and SPOP-dependent pathways depending on context.","evidence":"siRNA/overexpression with Western blot pathway readouts, DIA proteomics, and pharmacological epistasis (XAV-939) across multiple cell and animal models","pmids":["34957248","37417362","37594700","38006519"],"confidence":"Medium","gaps":["Direction of NF-κB regulation is opposite across tissues without a unifying mechanism","Direct molecular targets of pathway modulation mostly inferred from phosphorylation states"]},{"year":2023,"claim":"Linked SERPINA3 loss-of-function variants to generalized pustular psoriasis through impaired secretion or weakened cathepsin G inhibition, tying its canonical enzymatic activity to human disease.","evidence":"NGS variant identification, secretion assay, and cathepsin G enzymatic inhibition assay with patient-derived mutants","pmids":["36828876"],"confidence":"High","gaps":["Causality at the organismal/genetic-segregation level not detailed here","Downstream inflammatory consequence of failed cathepsin G inhibition not directly shown"]},{"year":2024,"claim":"Defined a non-redundant developmental requirement for SERPINA3 in chondrogenesis via maintenance of the master regulator SOX9.","evidence":"siRNA silencing during in vitro chondrogenesis with RNA-seq, histology, biochemical proteoglycan assay, and SOX9 Western blot, with osteogenesis as specificity control","pmids":["39097037"],"confidence":"High","gaps":["Mechanism by which SERPINA3 stabilizes SOX9 protein unknown","Whether protease-inhibitory activity is required not tested"]},{"year":2025,"claim":"Connected SERPINA3 abundance to an upstream ubiquitin-degradation switch (KCTD17→Zbtb7b) and to anti-fibrotic action in MASH, providing a druggable axis.","evidence":"KCTD17 depletion, Zbtb7b ubiquitination assay, hepatic stellate cell Par2/TGFβ activation assays, and pharmacological Kctd17 inhibition in dietary MASH mice","pmids":["40744994"],"confidence":"High","gaps":["Demonstrated in murine ortholog","Whether secreted SERPINA3 acts on stellate cells via protease inhibition not resolved"]},{"year":null,"claim":"It remains unresolved how SERPINA3 can act both as a secreted protease inhibitor/chaperone and as a promoter-binding nuclear regulator, and what mechanism dictates its opposite effects on NF-κB and proliferation across tissues.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model reconciling secreted and nuclear functions","No unifying mechanism for context-dependent signaling direction","Whether nuclear/promoter-binding activities require the serpin reactive-center loop is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[5,14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,14]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[6,7]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,11]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[5,8,14]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,11]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,13,17,18]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,14,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,2,3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,15]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[14,17]}],"complexes":[],"partners":["CTSG","HNRNPK","NR4A1","STAT3","NR1D1","ZBTB7B","RELA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P01011","full_name":"Alpha-1-antichymotrypsin","aliases":["Cell growth-inhibiting gene 24/25 protein","Serpin A3"],"length_aa":423,"mass_kda":47.7,"function":"Although its physiological function is unclear, it can inhibit neutrophil cathepsin G and mast cell chymase, both of which can convert angiotensin-1 to the active 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increased SERPINA3 expression while RNA interference-mediated knockdown of Nur77 decreased it.\",\n      \"method\": \"EMSA, ChIP, luciferase reporter assay, RNA interference knockdown and overexpression in HEK293T and HepG2 cells\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (EMSA in vitro binding, ChIP in vivo binding, luciferase reporter, gain- and loss-of-function), single lab\",\n      \"pmids\": [\"18248459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"STAT3 directly drives SERPINA3 transcription in melanoma cells; STAT3 binds the SERPINA3 promoter (validated by ChIP-qPCR), and STAT3 knockdown reduces SERPINA3 expression and impairs melanoma cell migration and invasion.\",\n      \"method\": \"ChIP-qPCR, RNA interference (STAT3 knockdown), global and JAK/STAT-specific gene expression profiling, migration/invasion functional assays\",\n      \"journal\": \"Laboratory investigation; a journal of technical methods and pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP-qPCR confirms direct promoter binding, combined with gene expression profiling and functional rescue assays, single lab\",\n      \"pmids\": [\"31278347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ApoA4 stimulates SERPINA3 gene expression in hepatocytes via the nuclear receptors NR4A1 and NR1D1, which bind the SERPINA3 promoter; this was verified by ChIP, luciferase reporter assay, and RNA interference-mediated knockdown of NR4A1 or NR1D1.\",\n      \"method\": \"ChIP, luciferase reporter assay, siRNA knockdown of NR4A1/NR1D1, in vivo and in vitro expression analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (ChIP, reporter assay, RNAi knockdown) in single lab, in vivo confirmation\",\n      \"pmids\": [\"28412351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SERPINA3 interacts with heterogeneous nuclear ribonucleoprotein K (HNRNP-K) under oxidative stress (H2O2 exposure); the SERPINA3-HNRNP-K complex enhances promoter activity and transcript levels of POT1, UHRF1, and HIST2H2BE. The amount of co-immunoprecipitated HNRNP-K correlates with the level of SERPINA3 oxidation; inhibition of SERPINA3 oxidation suppressed transcriptional activity of the complex.\",\n      \"method\": \"Co-immunoprecipitation (Co-IP), promoter activity assays, transcript quantification, correlative analysis of SERPINA3 oxidation status in HCC tissues\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus functional promoter assays, single lab, oxidation inhibition experiment corroborates mechanism\",\n      \"pmids\": [\"31121493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The SERPINA3 promoter is transcriptionally activated by the transcription factors SP1, MZF1, and ZBTB7B; the level of activation is allele-dependent (rs1884082 SNP), with the T allele induced more strongly than the G allele; when the promoter was methylated, ZBTB7B response became allele-specific. Overexpression of SERPINA3 in JEG-3 trophoblast cells decreased cell adhesion to extracellular matrix and neighboring cells but protected cells from apoptosis.\",\n      \"method\": \"Luciferase reporter assay with methylated/unmethylated promoter constructs, transfection of transcription factors, SNP allelic comparison, SERPINA3 overexpression in JEG-3 cells with adhesion and apoptosis assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus functional overexpression with defined phenotypic readout, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"22246292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINA3 variants identified in generalized pustular psoriasis (GPP) impair cathepsin G inhibitory function: one deletion variant (c.1246_1247del) produces a mutant protein that is not secreted and thus cannot inhibit cathepsin G; two missense variants reduce the ability of ACT (SERPINA3 protein) to inhibit cathepsin G enzymatic activity in functional assays.\",\n      \"method\": \"Next-generation sequencing, bioinformatic analysis, secretion assay of mutant vs wild-type SERPINA3, cathepsin G enzymatic inhibition assay with mutant proteins\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct enzymatic inhibition assay with patient-derived variants plus secretion functional test, single lab, multiple variants tested\",\n      \"pmids\": [\"36828876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Polymorphic SERPINA3 (I308T variant, rs142398813, and SAMP8-type Serpina3) prolongs the oligomeric state of Aβ42 peptide compared to wild-type SERPINA3, resulting in sustained oligomeric forms (trimers, tetramers) and increased neuronal cell death in SH-SY5Y cells; wild-type SERPINA3 accelerates Aβ42 fibrillization as a molecular chaperone.\",\n      \"method\": \"Transmission electron microscopy (TEM), Western blot (oligomer detection), thioflavin T assay, SH-SY5Y neuroblastoma cell death assay, comparison of recombinant wild-type vs polymorphic SERPINA3 proteins\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution with recombinant proteins, multiple assays (TEM, WB, ThT, cell death), single lab\",\n      \"pmids\": [\"33662018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Polymorphic SERPINA3-R124C acts as a 'benign chaperone' that shortens the lifetime of small soluble Aβ42 oligomers and converts Aβ42 into high-molecular aggregates more rapidly than wild-type SERPINA3, resulting in less cytotoxicity to SH-SY5Y cells compared to Aβ42 preincubated with wild-type SERPINA3.\",\n      \"method\": \"Transmission electron microscopy, thioflavin T assay, Western blot, SH-SY5Y cell viability assay with recombinant wild-type vs R124C SERPINA3\",\n      \"journal\": \"Bioscience, biotechnology, and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution with purified proteins, multiple orthogonal biophysical and cellular assays, single lab\",\n      \"pmids\": [\"34077500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Serpina3c/k (murine ortholog) is glycosylated at multiple N-glycosylation sites; during cellular stress (H2O2 or starvation), serpina3c/k secretion is increased and the secreted protein exhibits higher molecular weight. Site-directed mutagenesis of all four glycosylation sites (quadruple mutant) abolishes stress-induced secretion increase. In chronic kidney disease, serpina3c/k relocates from the cytoplasm to the apical tubular membrane.\",\n      \"method\": \"FLAG-tagged transfection, glycanase treatment, site-directed mutagenesis of glycosylation sites, Western blot, immunofluorescence/fractionation in kidney cells, in vivo rat acute kidney injury model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-directed mutagenesis of each glycosylation site combined with secretion assays and subcellular localization, in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"35147994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SERPINA3 silencing in high-metastatic colon cancer cells (HT-29LMM, KM-12L4) reduced cell migration and invasion in vitro and decreased expression of MMP-2 and MMP-9; in vivo, SERPINA3 siRNA reduced liver metastasis in mice and down-regulated Mmp-2, Mmp-9, and PCNA in metastatic lesions.\",\n      \"method\": \"siRNA knockdown, wound-healing assay, Transwell invasion assay, ELISA for MMP-2/MMP-9, in vivo mouse liver metastasis model with immunohistochemistry\",\n      \"journal\": \"Digestive diseases and sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in vitro and in vivo with defined mechanistic readout (MMP expression), single lab\",\n      \"pmids\": [\"29855767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SERPINA3 promotes endometrial cancer cell proliferation by regulating G2/M cell cycle checkpoint and inhibiting apoptosis; the pro-proliferative effect is associated with activation of MAPK/ERK1/2 and PI3K/AKT signaling pathways.\",\n      \"method\": \"SERPINA3 gain- and loss-of-function in endometrial cancer cell lines, cell cycle analysis, apoptosis assay, Western blot for ERK1/2 and AKT phosphorylation\",\n      \"journal\": \"International journal of clinical and experimental pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional assays with pathway readout (MAPK/ERK, PI3K/AKT), single lab\",\n      \"pmids\": [\"24817931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SERPINA3 overexpression in human neocortical development promotes outer radial glia (oRG) proliferation and increases upper-layer neurons, inducing cortical folding; downstream target Glo1 is involved, with SERPINA3 binding to the Glo1 promoter. Knock-in mice overexpressing SERPINA3 showed enhanced cognitive abilities.\",\n      \"method\": \"Overexpression in mouse brain (in vivo), quantification of oRG cells and neuron numbers, ChIP to demonstrate SERPINA3 binding to Glo1 promoter, knock-in mouse behavioral testing\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo overexpression with cellular phenotype and ChIP evidence of promoter binding; single lab, novel and unusual mechanism for a serpin\",\n      \"pmids\": [\"36414636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINA3 knockdown in vascular smooth muscle cells (RASMCs) attenuates proliferation and migration, and inhibits phosphorylation of IκBα and its downstream NF-κB pathway; secreted SERPINA3 protein increases expression of inflammatory factors in HUVECs.\",\n      \"method\": \"siRNA knockdown in RASMCs, EdU proliferation assay, scratch migration assay, Western blot for phospho-IκBα/NF-κB, recombinant SERPINA3 protein stimulation of HUVECs with RT-PCR for inflammatory factors\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function with pathway readout (NF-κB) and gain-of-function with secreted protein, single lab\",\n      \"pmids\": [\"34957248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINA3 overexpression in lung cancer cells inhibits NF-κB signaling by upregulating SPOP (speckle-type POZ protein), which in turn suppresses NF-κB p65; identified by data-independent acquisition mass spectrometry and validated by Western blot in cell lines and xenograft tumors.\",\n      \"method\": \"DIA mass spectrometry proteomics, SERPINA3 overexpression, Western blot validation of SPOP and NF-κB p65, xenograft mouse model\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics discovery plus Western blot and in vivo validation, single lab\",\n      \"pmids\": [\"37417362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINA3 inhibits cathepsin G (CTSG)-mediated cleavage of the anti-apoptotic protein 14-3-3ε in liver cancer cells, thereby protecting cells from neutrophil extracellular trap (NET)-induced apoptosis; NF-κB (p65) directly binds the SERPINA3 promoter to govern its expression in liver cancer.\",\n      \"method\": \"siRNA knockdown of SERPINA3, Western blot for 14-3-3ε cleavage, ChIP for p65 binding to SERPINA3 promoter, cell viability/apoptosis assays, antisense oligonucleotide targeting of SERPINA3\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mechanistic reconstitution (CTSG-14-3-3ε cleavage blocked by SERPINA3), ChIP for transcriptional regulation, siRNA and ASO loss-of-function with defined molecular readout, single lab\",\n      \"pmids\": [\"41653436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SERPINA3 is required for chondrogenic differentiation: its expression is markedly induced at early time points during in vitro chondrogenesis; siRNA silencing of SERPINA3 reduces cartilage pellet size, proteoglycan content, and downregulates ECM formation genes; SERPINA3 silencing markedly reduces SOX9 protein levels at early time points, suggesting SERPINA3 regulates the master transcriptional regulator SOX9 of chondrogenesis. The effect is specific to chondrogenesis (not osteogenesis).\",\n      \"method\": \"siRNA knockdown during in vitro chondrogenesis, RNA sequencing, DMMB assay, safranin-O staining, Western blot for SOX9, comparison with osteogenesis\",\n      \"journal\": \"Matrix biology : journal of the International Society for Matrix Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — loss-of-function with RNA-seq plus multiple orthogonal readouts (histology, biochemical assay, protein quantification), specificity demonstrated by negative result in osteogenesis, single lab\",\n      \"pmids\": [\"39097037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KCTD17 regulates SERPINA3 (murine Serpina3k) expression by facilitating ubiquitin-mediated degradation of Zbtb7b (a transcriptional activator of SERPINA3); KCTD17 depletion increases SERPINA3/Serpina3k levels. Increased SERPINA3 reduces liver fibrosis in MASH by inhibiting Par2/TGFβ-mediated activation of hepatic stellate cells. Pharmacological inhibition of Kctd17 reverses MASH-induced liver fibrosis in mice.\",\n      \"method\": \"KCTD17 depletion in mouse models, ubiquitin-mediated degradation assay for Zbtb7b, measurement of SERPINA3/Serpina3k secretion, hepatic stellate cell activation assays (Par2/TGFβ pathway), dietary rodent MASH models, pharmacological inhibition in vivo\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mechanistic dissection of ubiquitin degradation pathway, downstream stellate cell activation assay, in vivo pharmacological intervention, single lab\",\n      \"pmids\": [\"40744994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Nur77 (NR4A1) promotes SERPINA3 transcription by binding to the SERPINA3 promoter region (-182 to -175), upregulating SERPINA3 expression and activating the Wnt/β-catenin pathway; SERPINA3 knockdown alleviates cisplatin-induced HK-2 cell injury (increased viability/proliferation, decreased apoptosis and inflammation); the protective effect of Nur77 knockdown is antagonized by SERPINA3 overexpression.\",\n      \"method\": \"ChIP assay, dual-luciferase reporter assay, siRNA knockdown of Nur77 and SERPINA3, SERPINA3 overexpression rescue, flow cytometry for apoptosis, ELISA for cytokines\",\n      \"journal\": \"Nephrology (Carlton, Vic.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP plus reporter assay confirm direct binding; epistasis by rescue experiment; single lab\",\n      \"pmids\": [\"39957271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERPINA3 overexpression activates Wnt/β-catenin signaling to protect bladder epithelial cells (HBlEpCs) from apoptosis and promote cell growth; inhibition of Wnt/β-catenin with XAV-939 abolished the protective effect of serpina3n overexpression against cyclophosphamide-induced cystitis.\",\n      \"method\": \"Serpina3n overexpression in mouse IC/BPS model and HBlEpC cells, CCK-8/flow cytometry assays, Western blot for β-catenin, pharmacological inhibition (XAV-939) as epistasis test\",\n      \"journal\": \"International urology and nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain-of-function with pathway inhibitor epistasis test, in vivo and in vitro, single lab\",\n      \"pmids\": [\"37594700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMB3 upregulates SERPINA3 expression to promote intestinal inflammation via the integrin α3β1/FAK pathway; RNA sequencing and replenishment experiments showed that SERPINA3 is a downstream effector of LAMB3 in IBD intestinal epithelial cells.\",\n      \"method\": \"RNA sequencing after LAMB3 knockdown, replenishment (rescue) experiment with SERPINA3 re-expression, RT-qPCR, Western blot, dual-luciferase and ChIP-qPCR for LAMB3 regulation by p65\",\n      \"journal\": \"Inflammatory bowel diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — RNA-seq plus rescue experiment places SERPINA3 downstream of LAMB3/integrin α3β1/FAK, single lab\",\n      \"pmids\": [\"37454278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SERPINA3 promotes cell proliferation, wound healing, and activates ERK and AKT signaling pathways in human dermal fibroblasts; SERPINA3 expression is downregulated in aged fibroblasts and further reduced by oxidative stress.\",\n      \"method\": \"RNA-seq analysis of aged fibroblasts, SERPINA3 gain/loss-of-function, proliferation and wound-healing assays, Western blot for ERK and AKT phosphorylation\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional assays with pathway readout but single lab, limited mechanistic depth in abstract\",\n      \"pmids\": [\"40495483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SERPINA3 downregulation contributes to aromatase inhibitor (AI) resistance in ER-positive breast cancer; ANKRD11 functions as a downstream effector of SERPINA3 and induces AI insensitivity by interacting with and activating HDAC3. HDAC3 inhibition reverses AI resistance associated with decreased SERPINA3 and increased ANKRD11.\",\n      \"method\": \"Dataset screening (5 datasets), SERPINA3 knockdown/overexpression in cell lines, Co-IP for ANKRD11-HDAC3 interaction, HDAC3 activity assay, HDAC3 inhibitor rescue\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for protein interaction plus enzymatic activity assay and pharmacological rescue, single lab\",\n      \"pmids\": [\"37414914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SERPINA3 and LCN2 are upregulated in osteoblastic prostate cancer (BPCa) cells via osteoblast-derived extracellular vesicles in a co-culture system; enhanced expression of SERPINA3 and LCN2 promotes osteogenesis and suppresses BPCa cell proliferation in co-culture and mouse xenograft models.\",\n      \"method\": \"OB-BPCa co-culture system, extracellular vesicle-mediated transfer assay, xenograft mouse experiments with intracaudal injection, proliferation assays\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-culture with EV-transfer mechanism and in vivo xenograft validation, single lab\",\n      \"pmids\": [\"37408474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SerpinA3 promotes myocardial ischemia-reperfusion injury by activating NF-κB signaling: SerpinA3 knockdown inhibited p65 phosphorylation in myocardial tissues and reduced H2O2-induced inflammation, oxidative stress, and apoptosis in cardiomyocytes in vitro and improved cardiac function in vivo.\",\n      \"method\": \"siRNA knockdown of SerpinA3 in rat IR model and in vitro H2O2 model, Western blot for p65 phosphorylation, flow cytometry/TUNEL for apoptosis, cardiac function measurements\",\n      \"journal\": \"Molecular biotechnology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — loss-of-function with NF-κB pathway readout but the paper itself notes the exact mechanism remains 'untested'; single lab\",\n      \"pmids\": [\"38006519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SERPINA3 overexpression in prostate cancer cells activates IL-17 and TNFα signaling pathways by promoting CXCL2 expression, thereby increasing M1 macrophage recruitment into the tumor microenvironment and inhibiting cancer cell proliferation and invasion.\",\n      \"method\": \"Colony formation assay, Transwell assay, subcutaneous xenograft in mice, pathway analysis by RNA-seq/Western blot, CXCL2 expression measurement\",\n      \"journal\": \"Brazilian journal of medical and biological research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — functional assays and pathway identification, single lab, limited mechanistic depth on direct interaction\",\n      \"pmids\": [\"40367014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CTSC (cathepsin C) induces SERPINA3 expression in glioma cells via STAT3 signaling: CTSC activates STAT3, which mediates upregulation of SERPINA3 expression, and the CTSC/STAT3/SERPINA3 axis promotes glioma cell migration, invasion, and EMT.\",\n      \"method\": \"Transwell assay, RT-qPCR, Western blot for STAT3 and SERPINA3, CTSC overexpression/knockdown in glioma cells\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway placement by expression analysis and knockdown, single lab, limited mechanistic depth on direct interaction\",\n      \"pmids\": [\"37925117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SERPINA3 is expressed by a SERPINA3+ reactive astrocyte subtype (Ast.5) specifically enriched in the vicinity of neuritic amyloid plaques in human neocortex, as identified by spatial transcriptomics and validated at the protein level by immunofluorescence co-registered with immunohistochemistry.\",\n      \"method\": \"Spatial transcriptomics with distance-based analytic strategy, immunohistochemistry, immunofluorescence protein-level validation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization study (spatial transcriptomics + IHC), no direct functional experiment on SERPINA3, preprint\",\n      \"pmids\": [\"39605680\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Brain-specific SERPINA3N (murine) overexpression does not alter neuronal or glial development under homeostasis; however, under pathological conditions, SERPINA3N overexpression drives a pro-inflammatory response to brain injury, exacerbates blood-brain barrier dysfunction, promotes neurodegeneration through apoptotic neuronal loss, and disrupts oligodendroglial differentiation and myelination following neonatal brain injury.\",\n      \"method\": \"Brain-specific genetic overexpression tools in mice, neonatal brain injury model, cellular markers for neurons/glia/oligodendrocytes, BBB permeability assays, apoptosis assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific genetic tools in vivo with multiple cellular readouts; preprint but rigorous experimental design\",\n      \"pmids\": [\"bio_10.1101_2025.09.09.675167\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SERPINA3 (alpha-1-antichymotrypsin) is a secreted serine protease inhibitor whose primary enzymatic function is to inhibit cathepsin G (and related chymotrypsin-like proteases); its transcription is directly activated by nuclear receptors Nur77/NR4A1, NR1D1, and STAT3 binding to defined promoter elements, and modulated by methylation-sensitive transcription factors SP1/MZF1/ZBTB7B; intracellularly, under oxidative stress it forms a complex with HNRNP-K to regulate transcription of telomere and HCC-promoting genes; it acts as a molecular chaperone modulating Aβ42 oligomerization in a polymorphism-dependent manner; it plays a non-redundant role in chondrogenesis by maintaining SOX9 protein levels; and depending on cellular context it activates or suppresses NF-κB, PI3K/AKT, MAPK/ERK, or Wnt/β-catenin signaling to regulate apoptosis, migration, invasion, and inflammation across multiple tissue types.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SERPINA3 (alpha-1-antichymotrypsin) is a secreted serine protease inhibitor whose canonical activity is the inhibition of cathepsin G, and whose dysregulation across many tissue contexts links it to inflammation, cancer progression, and developmental programs [#5, #14]. Its protease-inhibitory function is direct and physiologically consequential: SERPINA3 blocks cathepsin G-mediated cleavage of the anti-apoptotic protein 14-3-3ε, shielding liver cancer cells from neutrophil extracellular trap-induced apoptosis [#14], and disease-associated variants in generalized pustular psoriasis either abolish secretion or weaken cathepsin G inhibition [#5]. SERPINA3 transcription is governed by a convergent set of inducible factors that bind its promoter—Nur77/NR4A1 at a defined NBRE (-182/-175), NR1D1, STAT3, NF-κB p65, and the methylation-sensitive activators SP1/MZF1/ZBTB7B—integrating nuclear-receptor, cytokine, and inflammatory inputs [#0, #1, #2, #4, #14, #17]; ZBTB7B-driven expression is further set by KCTD17-mediated ubiquitin degradation of the activator [#16]. Beyond its secreted role, SERPINA3 functions intracellularly: under oxidative stress its oxidized form complexes with HNRNP-K to drive transcription of POT1, UHRF1 and HIST2H2BE [#3], it binds the Glo1 promoter to expand outer radial glia and promote cortical folding [#11], and it is required for chondrogenesis by maintaining SOX9 protein levels [#15]. As a context-dependent signaling modulator, SERPINA3 activates or suppresses NF-κB (in part via SPOP-mediated repression of p65), PI3K/AKT, MAPK/ERK, and Wnt/β-catenin pathways to control proliferation, migration, invasion, and apoptosis [#10, #12, #13, #17, #18]. It also acts as an extracellular chaperone of amyloid-β42, where wild-type protein accelerates fibrillization while disease-linked polymorphisms alter oligomer lifetimes and neuronal cytotoxicity [#6, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the first defined transcriptional control element of SERPINA3, answering how its expression is switched on by a nuclear receptor.\",\n      \"evidence\": \"EMSA, ChIP, luciferase reporter and Nur77 gain/loss-of-function in HEK293T and HepG2 cells\",\n      \"pmids\": [\"18248459\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not connect Nur77-driven SERPINA3 to a downstream physiological output\", \"Other promoter elements not yet mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed SERPINA3 promoter activity is allele- and methylation-dependent through SP1/MZF1/ZBTB7B, and linked its overexpression to reduced adhesion and apoptosis resistance.\",\n      \"evidence\": \"Luciferase reporter with methylated/unmethylated constructs, SNP allelic comparison, and overexpression with adhesion/apoptosis assays in JEG-3 trophoblasts\",\n      \"pmids\": [\"22246292\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional readout limited to one trophoblast line\", \"Mechanism linking adhesion/apoptosis phenotype to protease inhibition unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Expanded the transcriptional network by placing STAT3 and a NR4A1/NR1D1 nuclear-receptor axis upstream of SERPINA3 in distinct tissues.\",\n      \"evidence\": \"ChIP/ChIP-qPCR, luciferase reporter, RNAi knockdown, and migration/invasion assays in melanoma and hepatocytes\",\n      \"pmids\": [\"31278347\", \"28412351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these factors act combinatorially on the same promoter is untested\", \"Cell-type specificity of each input not reconciled\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed an unexpected intracellular, redox-gated role: oxidized SERPINA3 complexes with HNRNP-K to drive transcription of telomere and HCC-promoting genes.\",\n      \"evidence\": \"Co-IP, promoter activity and transcript assays with oxidation-status correlation in HCC tissue\",\n      \"pmids\": [\"31121493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation of the complex\", \"Mechanism of nuclear entry of a secreted serpin unexplained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined SERPINA3 as an amyloid-β42 chaperone whose effect on oligomer lifetime and neurotoxicity is dictated by sequence polymorphism.\",\n      \"evidence\": \"Recombinant wild-type vs variant protein with TEM, thioflavin T, Western blot, and SH-SY5Y cell-death assays\",\n      \"pmids\": [\"33662018\", \"34077500\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro reconstitution only; no in vivo amyloid pathology test\", \"Structural basis of polymorphism-dependent chaperoning not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated that glycosylation controls stress-induced SERPINA3 secretion and that it relocates to apical tubular membranes in kidney disease, linking post-translational modification to its trafficking.\",\n      \"evidence\": \"Site-directed mutagenesis of glycosylation sites, glycanase treatment, secretion and localization assays in vitro and rat AKI model (murine ortholog)\",\n      \"pmids\": [\"35147994\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of membrane relocation untested\", \"Conducted on murine ortholog\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Uncovered a developmental nuclear function in which SERPINA3 binds the Glo1 promoter to expand outer radial glia and induce human-type cortical folding.\",\n      \"evidence\": \"In vivo overexpression in mouse brain, oRG/neuron quantification, ChIP for Glo1 promoter binding, and knock-in behavioral testing\",\n      \"pmids\": [\"36414636\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a secreted serpin engages a promoter is mechanistically unresolved\", \"Glo1 as the sole effector not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided the clearest enzymatic-to-phenotype chain: SERPINA3 inhibits cathepsin G cleavage of 14-3-3ε to protect cancer cells from NET-induced death, with NF-κB p65 driving its expression.\",\n      \"evidence\": \"siRNA/ASO knockdown, Western blot for 14-3-3ε cleavage, ChIP for p65 binding, and apoptosis assays in liver cancer\",\n      \"pmids\": [\"41653436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this mechanism generalizes beyond liver cancer untested\", \"Stoichiometry of SERPINA3-cathepsin G inhibition in this context not quantified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established SERPINA3 as a bidirectional signaling modulator across vascular, lung, urological, and cardiac systems, activating or suppressing NF-κB, Wnt/β-catenin, and SPOP-dependent pathways depending on context.\",\n      \"evidence\": \"siRNA/overexpression with Western blot pathway readouts, DIA proteomics, and pharmacological epistasis (XAV-939) across multiple cell and animal models\",\n      \"pmids\": [\"34957248\", \"37417362\", \"37594700\", \"38006519\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direction of NF-κB regulation is opposite across tissues without a unifying mechanism\", \"Direct molecular targets of pathway modulation mostly inferred from phosphorylation states\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked SERPINA3 loss-of-function variants to generalized pustular psoriasis through impaired secretion or weakened cathepsin G inhibition, tying its canonical enzymatic activity to human disease.\",\n      \"evidence\": \"NGS variant identification, secretion assay, and cathepsin G enzymatic inhibition assay with patient-derived mutants\",\n      \"pmids\": [\"36828876\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causality at the organismal/genetic-segregation level not detailed here\", \"Downstream inflammatory consequence of failed cathepsin G inhibition not directly shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a non-redundant developmental requirement for SERPINA3 in chondrogenesis via maintenance of the master regulator SOX9.\",\n      \"evidence\": \"siRNA silencing during in vitro chondrogenesis with RNA-seq, histology, biochemical proteoglycan assay, and SOX9 Western blot, with osteogenesis as specificity control\",\n      \"pmids\": [\"39097037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which SERPINA3 stabilizes SOX9 protein unknown\", \"Whether protease-inhibitory activity is required not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected SERPINA3 abundance to an upstream ubiquitin-degradation switch (KCTD17→Zbtb7b) and to anti-fibrotic action in MASH, providing a druggable axis.\",\n      \"evidence\": \"KCTD17 depletion, Zbtb7b ubiquitination assay, hepatic stellate cell Par2/TGFβ activation assays, and pharmacological Kctd17 inhibition in dietary MASH mice\",\n      \"pmids\": [\"40744994\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Demonstrated in murine ortholog\", \"Whether secreted SERPINA3 acts on stellate cells via protease inhibition not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how SERPINA3 can act both as a secreted protease inhibitor/chaperone and as a promoter-binding nuclear regulator, and what mechanism dictates its opposite effects on NF-κB and proliferation across tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model reconciling secreted and nuclear functions\", \"No unifying mechanism for context-dependent signaling direction\", \"Whether nuclear/promoter-binding activities require the serpin reactive-center loop is untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [5, 8, 14]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 11]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 13, 17, 18]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 14, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 15]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [14, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTSG\", \"HNRNPK\", \"NR4A1\", \"STAT3\", \"NR1D1\", \"ZBTB7B\", \"RELA\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}