{"gene":"SLPI","run_date":"2026-06-10T07:46:35","timeline":{"discoveries":[{"year":1986,"finding":"SLPI (antileukoprotease/HUSI-I) is a 107 amino acid, ~12 kDa protein containing 16 cysteines forming disulfide bonds, organized into two consecutive domains each with a 'four-disulfide-core' (WAP domain) structural motif homologous to chelonianin and whey proteins. The complete sequence was determined by both direct protein sequencing and cDNA sequencing from cervical tissue mRNA.","method":"Direct protein sequencing and cDNA cloning/sequencing","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct protein sequencing combined with cDNA sequencing, foundational structural determination replicated across two orthogonal methods","pmids":["3485543"],"is_preprint":false},{"year":1986,"finding":"SLPI inhibits mast cell chymase; equimolar concentrations (~10 nM) of chymase and SLPI result in rapid complex formation, with 50% inhibition of chymase activity requiring ~700 nM SLPI (dissociation constant ~44 nM for the eglin c-chymase complex for comparison). SLPI thus functions as a direct inhibitor of mast cell chymase.","method":"In vitro enzymatic inhibition assay with purified proteins","journal":"Biological chemistry Hoppe-Seyler","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzymatic assay with purified SLPI and chymase, quantitative Ki determination","pmids":["3530282"],"is_preprint":false},{"year":1988,"finding":"SLPI inhibits trypsin, chymotrypsin, granulocytic elastase, cathepsin G, mast cell chymase, and tryptase. The various forms isolated from different secretions (bronchial mucus, seminal plasma, cervical mucus, parotid secretion) are identical or derived from a single gene product.","method":"Biochemical characterization and enzymatic inhibition assays","journal":"Biological chemistry Hoppe-Seyler","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic assays, replicated across multiple laboratories and tissue sources","pmids":["3060147"],"is_preprint":false},{"year":1990,"finding":"After intravenous injection, SLPI is rapidly cleared from plasma with an initial half-life of ~10 minutes, followed by slower clearance (~60-120 min). Radioactivity accumulated predominantly in kidneys, and renal metabolism of SLPI was demonstrated. Intact SLPI was not detected in urine, indicating renal catabolism rather than filtration.","method":"Radiolabeled (35S and 125I) SLPI pharmacokinetics in dogs and human volunteers, organ biodistribution","journal":"Scandinavian journal of clinical and laboratory investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vivo pharmacokinetics with radiolabeled protein in two species, single lab","pmids":["2293334"],"is_preprint":false},{"year":1993,"finding":"The C-terminal domain of SLPI (half-SLPI, Asn55-Ala107) alone is sufficient to inhibit neutrophil elastase and cathepsin G, and to inhibit cathepsin G-mediated platelet activation and PMN-mediated platelet activation, though less potently than full-length SLPI. This establishes the catalytic/inhibitory site resides in the C-terminal domain.","method":"In vitro enzymatic inhibition assay and platelet activation assay using recombinant full-length and truncated SLPI","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro assay with recombinant truncated proteins and multiple functional readouts, single lab","pmids":["8097952"],"is_preprint":false},{"year":1994,"finding":"IL-1β and TNF-α induce significant SLPI expression in human airway epithelial cell lines (A549 and NCI-H322), identifying these cytokines as major transcriptional inducers of SLPI in the lung epithelium.","method":"Cell culture stimulation with cytokines, protein measurement in supernatants","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, single method (protein measurement), but replicated in two cell lines","pmids":["7946401"],"is_preprint":false},{"year":1997,"finding":"SLPI purified from saliva or produced as recombinant protein inhibits HIV-1 infection of human monocytes in vitro at 100 ng/mL. Salivary levels of SLPI exceed this threshold, consistent with in vivo antiviral activity. Breast milk SLPI levels were insufficient to provide antiviral protection except in colostrum.","method":"In vitro HIV-1 infection assay with purified native and recombinant SLPI, ELISA quantification, Northern blot and immunohistochemistry","journal":"Oral diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro inhibition assay with both native and recombinant protein, multiple methods, single lab","pmids":["9456660"],"is_preprint":false},{"year":1998,"finding":"SLPI is inducibly expressed in migrating keratinocytes of healing wounds and in lesional psoriatic epidermis, but not in proliferating keratinocytes. Extracellular SLPI was found associated with elastin fibers in the dermis adjacent to SLPI-expressing keratinocytes. Recombinant SLPI exhibited antibacterial activity with a distinct spectrum compared to lysozyme and defensins.","method":"Immunohistochemistry, in situ hybridization, cell culture differentiation assays, antibacterial functional assays","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (IHC, ISH, functional assay), single lab","pmids":["9856807"],"is_preprint":false},{"year":1998,"finding":"SLPI gene is organized into four exons and three introns spanning ~2.2 kb with a transcription start site located 20 nt upstream of the ATG initiation codon. The human SLPI gene maps to chromosome 20q12-13.2 and the mouse homologue to chromosome 2H by fluorescence in situ hybridization.","method":"Genomic DNA sequencing, primer extension analysis, FISH","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct genomic sequencing plus FISH chromosomal localization, two orthogonal methods","pmids":["9843921"],"is_preprint":false},{"year":1999,"finding":"IRF-1 transcriptionally represses SLPI expression. RNA fingerprinting identified SLPI as downregulated upon IRF-1 induction; an ISRE-like binding site was mapped to the -221 to -200 region of the SLPI promoter to which IRF-1 binds, and co-transfection studies demonstrated that IRF-1 co-expression inhibits SLPI promoter activity.","method":"RNA fingerprinting, promoter deletion analysis, electrophoretic mobility shift assay (EMSA), co-transfection/reporter assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (RNA fingerprinting, EMSA, co-transfection reporter), single lab","pmids":["10498899"],"is_preprint":false},{"year":2000,"finding":"Neutrophil elastase (NE) increases SLPI mRNA levels in primary bronchial epithelial cells while simultaneously decreasing SLPI protein in supernatants by promoting accumulation of cell-associated SLPI. This apparent paradox is explained by NE causing SLPI retention at the cell surface rather than inhibiting SLPI synthesis.","method":"Primary bronchial epithelial cell culture, Northern blot, ELISA of supernatants and cell lysates","journal":"Journal of investigative medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — primary cells, two orthogonal readouts (mRNA and protein in supernatant vs. cell fraction), single lab","pmids":["10979241"],"is_preprint":false},{"year":2000,"finding":"Neutrophil-derived alpha-defensins increase SLPI protein release from primary bronchial epithelial cells in a time- and dose-dependent manner without affecting SLPI mRNA levels, indicating post-transcriptional or post-translational regulation. Alpha-1-proteinase inhibitor further enhanced defensin-induced SLPI release.","method":"Primary bronchial epithelial cell culture, ELISA, Northern blot","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — primary cells, orthogonal protein and mRNA measurements, single lab","pmids":["10645890"],"is_preprint":false},{"year":2001,"finding":"Cigarette smoke oxidatively inactivates human SLPI in vivo. In a mouse model, intratracheal human recombinant SLPI's antitryptic inhibitory activity was reduced by 50% following cigarette smoke exposure; this inactivation was prevented by N-acetylcysteine pretreatment, demonstrating oxidation-dependent loss of SLPI function.","method":"In vivo mouse model, bronchoalveolar lavage fluid antitryptic activity assay, oxidative stress markers","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo functional assay, prevention by antioxidant confirms oxidative mechanism, single lab","pmids":["11435216"],"is_preprint":false},{"year":2003,"finding":"SLPI-deficient (SLPI-/-) mice show increased mortality from LPS-induced endotoxin shock. Mechanistically, SLPI-/- macrophages produce higher IL-6 and HMGB1 and show greater NF-κB activity after LPS treatment. SLPI-/- B cells show more proliferation and IgM production after LPS, demonstrating that endogenous SLPI attenuates NF-κB-mediated inflammatory responses.","method":"SLPI knockout mouse model, LPS challenge, macrophage culture, ELISA for cytokines, NF-κB reporter assay, B cell proliferation assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined cellular phenotypes and mechanism (NF-κB), multiple cell types and readouts, published in top journal","pmids":["12615907"],"is_preprint":false},{"year":2004,"finding":"SLPI interacts physically with platelet-restricted β1-tubulin, discovered by yeast two-hybrid screen of megakaryocyte cDNAs. In megakaryocytes and platelets, a fraction of SLPI co-localizes along peripheral microtubules in a β1-tubulin-dependent manner (lost in β1-tubulin-/- platelets and upon cold-induced MT disruption). SLPI is released upon platelet activation and its elastase-inhibitory activity is reduced in the absence of β1-tubulin, suggesting regulated anti-proteolytic function at platelet activation.","method":"Yeast two-hybrid screen, immunofluorescence, subcellular fractionation, platelet activation assay, β1-tubulin knockout mouse","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast 2-hybrid discovery confirmed by immunofluorescence, fractionation, and knockout mouse, multiple orthogonal methods","pmids":["15315966"],"is_preprint":false},{"year":2005,"finding":"SLPI's suppression of macrophage LPS responses (NO and TNF production) is independent of its anti-protease activity. Single amino acid substitution mutants of SLPI (M73G, M73F, M73E, M73K) that selectively lose elastase and/or chymotrypsin inhibitory activity still suppress LPS responses similarly to wild-type SLPI. Truncated forms containing only the N-terminus or C-terminus are individually sufficient to confer LPS inhibition.","method":"Site-directed mutagenesis of SLPI active site, stable transfection of RAW264.7 macrophages, LPS stimulation assay, NO and TNF measurement","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Strong — active-site mutagenesis with multiple mutants, domain truncation experiments, functional readouts in stable cell lines","pmids":["16112212"],"is_preprint":false},{"year":2005,"finding":"HIV-1-mediated stimulation of SLPI expression and production in oral epithelial cells occurs at the transcriptional level, is dose- and time-dependent, is induced by heat-inactivated and infectious virus equally, and does not depend on cellular infection. The stimulatory effect is specifically induced by HIV-1 and SIV envelope glycoproteins (gp120), not other viral proteins.","method":"Real-time RT-PCR, ELISA, heat-inactivated virus controls, purified retroviral protein experiments, primary oral epithelial cells","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods, primary cells validation, mechanism narrowed to gp120 interaction, single lab","pmids":["15858026"],"is_preprint":false},{"year":2005,"finding":"Induction of SLPI in macrophages by Mycobacterium tuberculosis depends on TLR2 but not TLR4 or MyD88. Macrophages from TLR2-/- mice failed to upregulate SLPI in response to heat-killed M. tuberculosis, while TLR4-/- and MyD88-/- macrophages responded normally, identifying a TLR2-dependent, MyD88-independent signaling pathway for SLPI induction.","method":"Macrophages from TLR2-/-, TLR4-/-, MyD88-/- knockout mice, real-time PCR and ELISA for SLPI expression","journal":"Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using multiple knockout mice with defined molecular pathway, multiple readouts","pmids":["16236128"],"is_preprint":false},{"year":2005,"finding":"H3-K4 trimethylation across the SLPI coding region is enhanced by IL-1β stimulation and correlates with increased RNA polymerase II recruitment to the SLPI gene. The methylase inhibitor 5-azacytidine attenuates both H3-K4 trimethylation and RNA Pol II recruitment, reducing SLPI mRNA and protein levels, demonstrating that histone H3-K4 methylation regulates SLPI transcriptional induction.","method":"Chromatin immunoprecipitation (ChIP), Western blot, SLPI promoter reporter assay, 5-azacytidine pharmacological inhibition","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with pharmacological validation and reporter assay, single lab","pmids":["15845363"],"is_preprint":false},{"year":2007,"finding":"Epithelial cell-derived SLPI restrains B cell immunoglobulin class switching by inhibiting AID induction in B cells. SLPI acts as a homeostatic brake on Toll-like receptor-induced class switching in tonsillar B cells.","method":"Human tonsillar explant cultures, B cell-epithelial co-culture experiments, AID measurement, immunoglobulin class-switching assays, SLPI blocking experiments","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct functional experiments with primary human cells, multiple readouts, published in top-tier journal","pmids":["17259987"],"is_preprint":false},{"year":2007,"finding":"SLPI suppresses cancer cell invasion in vitro while promoting blood-borne metastasis via an invasion-independent pathway. Overexpression of SLPI in mammary tumor cells induced sinusoidal vasculature and endothelial-coated tumor emboli in vivo, associated with SLPI's anti-migratory effect on endothelial cells. SLPI inhibited migration of both tumor cells and HUVECs through Matrigel.","method":"SLPI gene transfection into MCH66 mouse mammary tumor cells, in vivo tumor implantation, Matrigel invasion/migration assays, in vivo angiogenesis assay","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro experiments, multiple functional readouts, single lab","pmids":["17455170"],"is_preprint":false},{"year":2008,"finding":"SLPI is synthesized in myelocytes and co-localizes with lactoferrin in secondary granules of neutrophils, as determined by subcellular fractionation. SLPI is co-released with lactoferrin within minutes of neutrophil activation, establishing SLPI as a secondary granule protein in PMNs.","method":"Microarray expression profiling of bone marrow populations, immunostaining of bone marrow cells, subcellular fractionation, exocytosis assay","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — subcellular fractionation with co-localization, exocytosis studies, microarray expression data across differentiation stages, multiple orthogonal methods","pmids":["18285402"],"is_preprint":false},{"year":2008,"finding":"NE-mediated decrease in SLPI in cell culture supernatants is a passive, charge-dependent phenomenon. Theoretical molecular modeling showed that the NE-SLPI complex has a greater positive charge than complexes of SLPI with other proteinases (trypsin, tryptase), correlating with the selective ability of NE and cathepsin G (but not other proteinases) to reduce secreted SLPI levels by promoting complex binding to negatively-charged cell membranes.","method":"Respiratory epithelial cell culture, ELISA, synthetic NE inhibitor controls, theoretical molecular modeling of charge","journal":"Respiratory research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combination of in vitro cell experiments and computational modeling, mechanism identified by pharmacological controls, single lab","pmids":["18699987"],"is_preprint":false},{"year":2008,"finding":"SLPI plays a crucial role in early myocardial performance after ischemia/reperfusion in cardiac transplantation. SLPI-/- hearts showed profoundly impaired early contractility after cold ischemia, associated with high intra-graft protease expression. rSLPI added to preservation solution (but not systemic administration) restored normal myocardial contraction. Intra-graft SLPI inversely correlated with protease levels and TGF-β expression.","method":"SLPI-/- mouse heterotopic cardiac transplantation model, recombinant SLPI administration, myocardial performance assessment, histology, ELISA for TNF-α, TGF-β, protease levels","journal":"American journal of transplantation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus recombinant protein rescue, multiple molecular readouts, single lab","pmids":["18294346"],"is_preprint":false},{"year":2008,"finding":"SLPI promotes proliferation and oligodendroglial differentiation of adult neural stem cells. Recombinant SLPI treatment increased cell proliferation (BrdU incorporation), upregulated cyclin D1, suppressed HES1, and prevented degradation of IκBα in neural stem cells, suggesting NF-κB pathway inhibition as a mechanism underlying oligodendroglial differentiation.","method":"Adult neural stem cell culture, recombinant SLPI treatment, BrdU incorporation, real-time PCR for cyclin D1 and HES1, Western blot for IκBα, immunofluorescence","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods in primary neural stem cells, single lab","pmids":["18501024"],"is_preprint":false},{"year":2010,"finding":"Protein disulfide isomerase (PDI) overexpression enhances SLPI folding in Pichia pastoris, increasing SLPI yield >5-fold and enhancing its specific anti-protease activity. Mass spectrometry confirmed a greater number of disulfide bonds in PDI-overexpression-derived SLPI, demonstrating that proper disulfide bond formation is required for SLPI biological activity.","method":"Recombinant protein expression in Pichia pastoris, mass spectrometry disulfide bond analysis, anti-protease activity assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mass spectrometry plus functional activity assay, demonstrates disulfide-dependent folding requirement, single lab","pmids":["20971072"],"is_preprint":false},{"year":2011,"finding":"SLPI is a substrate for tissue transglutaminase (type 2) and plasma transglutaminase (factor XIIIa), which covalently cross-link it to fibronectin and elastin. Cross-linked SLPI retains its ability to inhibit elastase and cathepsin G. Mass spectrometry identified transglutamination sites: reactive lysine and glutamine residues are located predominantly in SLPI's N-terminal domain.","method":"In vitro transglutaminase cross-linking assay, mass spectrometry of tryptic digests, enzymatic activity assay of cross-linked SLPI","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with mass spectrometry site identification and functional retention assay, single lab but multiple orthogonal methods","pmids":["21687692"],"is_preprint":false},{"year":2011,"finding":"TSLP signaling through TSLP receptor on intestinal epithelial cells (non-hematopoietic cells) induces SLPI expression, and this SLPI induction is required for mucosal healing after DSS-induced colitis. TSLP-deficient mice failed to recover from colitis and showed increased neutrophil elastase (NE) activity and reduced SLPI; pharmacological NE inhibition or rSLPI treatment rescued mortality in Tslp-/- mice.","method":"Tslp-/- mouse model, DSS colitis, rSLPI treatment, NE pharmacological inhibitor, bone marrow chimera experiments (TSLPR on non-hematopoietic cells)","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout, chimera epistasis, pharmacological rescue with defined cellular pathway, published in high-impact journal","pmids":["21820333"],"is_preprint":false},{"year":2011,"finding":"SLPI promotes tumor invasion in ovarian cancer by inducing MMP-9 transcription and protein production independent of its serine protease inhibitory activity. A protease-inhibitor-null SLPI mutant (F-SLPI) similarly induces MMP-9 transcription and increases invasion. Wild-type SLPI additionally inhibits plasmin activity and MMP-9 activation, yielding net increased MMP-9 activity. SLPI and MMP-9 are strongly correlated in serous ovarian cancers.","method":"Stable HEYA8 ovarian cancer transfectants with wild-type and protease-inhibitor-null SLPI, invasion assay, MMP-9 transcription/protein/activity assay, plasmin activity assay, xenograft model, tissue microarray","journal":"Gynecologic oncology","confidence":"High","confidence_rationale":"Tier 1 / Strong — protease-inhibitor-null mutant distinguishes mechanisms, in vitro and in vivo readouts, tissue correlation, multiple orthogonal methods","pmids":["21676452"],"is_preprint":false},{"year":2011,"finding":"SLPI is produced in human mast cells. Double-immunolabeling showed SLPI coexists with tryptase (60%) and chymase (37%)-containing mast cells, and in situ hybridization confirmed SLPI mRNA expression in all mast cells, suggesting SLPI acts as a local regulator of mast cell protease activity.","method":"Double immunolabeling, in situ hybridization","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods for localization, single lab","pmids":["10355635"],"is_preprint":false},{"year":2012,"finding":"SLPI inhibits regulatory T cell differentiation. In vitro addition of SLPI to naive human CD4+ T cell cultures significantly decreased the number of functional FoxP3+ CD25hi CD4+ regulatory T cells. Recombinant TGF-β neutralized SLPI's inhibitory effect on Treg differentiation, placing SLPI upstream of TGF-β in this pathway. In vivo, SLPI neutralization in EAE increased serum TGF-β and FoxP3+ T cells.","method":"Human CD4+ T cell culture with recombinant SLPI, SLPI-neutralizing antibody in EAE mouse and rat model, flow cytometry, ELISA for TGF-β, TGF-β rescue experiment","journal":"BMC neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic rescue plus in vivo validation, multiple readouts, single lab","pmids":["22436018"],"is_preprint":false},{"year":2012,"finding":"Nrf2 transcriptionally regulates SLPI expression in nasal epithelial cells. Sulforaphane (SFN, an Nrf2 activator) significantly enhanced SLPI secretion in vitro, and this effect was significantly reduced by Nrf2-specific shRNA knockdown, establishing Nrf2 as a direct regulator of SLPI transcription.","method":"Nasal lavage fluid ELISA after sulforaphane ingestion, differentiated primary nasal epithelial cells, Nrf2 shRNA knockdown, SLPI ELISA","journal":"Respiratory medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo + in vitro with shRNA knockdown of regulator, single lab","pmids":["23195333"],"is_preprint":false},{"year":2013,"finding":"SLPI controls myeloid cell proliferation, differentiation, and cell cycle. Downregulation of SLPI with shRNA in CD34+ hematopoietic progenitors reduced myeloid differentiation, caused cell-cycle arrest, and elevated apoptosis. Mechanistically, SLPI knockdown upregulated NF-κB and reduced phospho-ERK1/2-mediated phosphorylation/activation of LEF-1 transcription factor. Wild-type NE (but not mutant forms) upregulated SLPI, establishing reciprocal NE-SLPI regulation.","method":"shRNA knockdown of SLPI in CD34+ bone marrow progenitors, neutrophil elastase transduction (wild-type and mutant), flow cytometry for differentiation/apoptosis/cell-cycle, Western blot for NF-κB and p-ERK1/2, microarray analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — shRNA loss-of-function in primary cells plus mutant NE rescue experiments, multiple pathway-level readouts, replicated in patient samples","pmids":["24352879"],"is_preprint":false},{"year":2013,"finding":"STAT1 transcriptionally regulates SLPI expression in airway epithelial cells. STAT1 promoter reporter assays and chromatin immunoprecipitation confirmed STAT1 binding to the SLPI promoter. Stat1-/- mice showed reduced pulmonary Slpi protein. Smokers have increased STAT1 mRNA/protein in nasal epithelial cells, explaining their increased SLPI expression.","method":"SLPI promoter reporter assays, chromatin immunoprecipitation (ChIP), stat1-/- mouse model, Western blot and RT-PCR","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus reporter assays plus genetic knockout mouse, multiple orthogonal methods confirming STAT1-SLPI regulatory axis","pmids":["24285265"],"is_preprint":false},{"year":2014,"finding":"SLPI functions as a novel inhibitor of plasminogen activation through its interaction with annexin A2, with concomitant reduction in plasmin generation by macrophages and OSCC cell lines. In vitro, SLPI blocked protease-dependent tumor cell migration.","method":"Co-immunoprecipitation of SLPI with annexin A2, plasmin generation assay with macrophages and cell lines, in vitro invasion assay","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional plasmin assay plus invasion assay, single lab","pmids":["21641406"],"is_preprint":false},{"year":2014,"finding":"SLPI exerts antifungal activity against Candida albicans, including reducing secreted serine proteinase activity by 48.8%, reducing adhesion to mammalian cells by 60.1%, reducing cell surface mannoprotein expression, and causing ultrastructural changes (membrane-like structures in cytoplasm). Flow cytometry suggested specific SLPI binding sites on the yeast surface.","method":"MIC determination, serine proteinase activity assay, flow cytometry for surface receptors and mannoproteins, adhesion assay, transmission electron microscopy","journal":"Archives of oral biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays and structural analysis, single lab","pmids":["24907522"],"is_preprint":false},{"year":2015,"finding":"IFN-γ inversely regulates SLPI expression, defining a dysregulated IFN-γ/SLPI axis in severe asthma. In a severe asthma mouse model, forced SLPI expression decreased airway hyperresponsiveness (AHR) independent of corticosteroids, and combining SLPI with CS further reduced AHR. Pathway analysis linked IFN-γ to SLPI suppression, confirmed in both SA patients and the mouse model.","method":"Computer-assisted pathway analysis, severe asthma mouse model with Ifng-/- and Il17ra-/- mice, adenoviral SLPI overexpression, airway hyperresponsiveness measurement (AHR), BAL analysis from human SA and MMA patients","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout mice plus forced expression rescue, human patient validation, multiple orthogonal methods","pmids":["26121748"],"is_preprint":false},{"year":2015,"finding":"SLPI inhibits NET (neutrophil extracellular trap) formation in human neutrophils in a manner partially dependent on its NE-inhibitory activity. SLPI inhibits histone H4 (H4) cleavage during NET formation. SLPI-/- mouse neutrophils are more efficient at generating NETs than WT neutrophils in vitro and in experimental psoriasis in vivo. Endogenous SLPI co-localizes with NE in the nucleus of human neutrophils both in vitro and in psoriatic skin.","method":"Human neutrophil NET assay with recombinant SLPI, SLPI-/- mouse neutrophils, histone H4 cleavage assay, immunofluorescence co-localization, experimental psoriasis model","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (in vitro human, knockout mouse in vitro and in vivo), mechanistic dissection of NE-dependence and nuclear co-localization","pmids":["25917460"],"is_preprint":false},{"year":2017,"finding":"SLPI physically interacts with the retinoblastoma tumor suppressor protein (Rb) and releases FoxM1 from the Rb-FoxM1 complex, potentially activating FoxM1 target genes involved in breast cancer metastasis. SLPI secretion was identified as a target of a novel compound (C74) that inhibits SLPI secretion, reducing tumor growth and lung metastasis.","method":"High-throughput screening for SLPI secretion inhibitors, co-immunoprecipitation of SLPI with Rb, FoxM1 complex disruption assay, orthotopic 4T1 mouse tumor model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for SLPI-Rb interaction plus in vivo functional validation, single lab","pmids":["29312532"],"is_preprint":false},{"year":2017,"finding":"SLPI promotes osteoblast focal adhesion on titanium surfaces. Recombinant SLPI treatment of MC3T3-E1 cells on titanium increased actin stress fibers, paxillin expression, FAK phosphorylation, and ERK1/2 phosphorylation through Grb2-Ras signaling, establishing SLPI as an activator of integrin-FAK-ERK signaling for cell adhesion.","method":"MC3T3-E1 osteoblast culture on titanium, recombinant SLPI treatment, immunofluorescence for actin/paxillin, Western blot for FAK, Grb2, Ras, ERK1/2 phosphorylation","journal":"Journal of nanoscience and nanotechnology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, correlative Western blot readouts without receptor identification or pathway validation","pmids":["26328330"],"is_preprint":false},{"year":2019,"finding":"SLPI dose-dependently inhibits ATP-mediated inflammasome activation and IL-1β release in human monocytic cells without affecting pro-IL-1β mRNA induction by LPS. The mechanism involves activation of calcium-independent phospholipase A2β (iPLA2β), release of a low-molecular-mass mediator, signaling through nicotinic acetylcholine receptor subunits α7, α9, α10, and Src kinase activation, resulting in inhibition of ATP-induced caspase-1 activation. SLPI does not directly modulate P2X7 receptor ion channel function in Xenopus oocytes but inhibits ATP-induced ion currents in human U937 cells.","method":"Human monocytic cell culture, ELISA for IL-1β, RT-PCR for pro-IL-1β, specific inhibitors and siRNA for iPLA2β, nicotinic receptor subunit siRNA, caspase-1 activity assay, Xenopus oocyte electrophysiology","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological and siRNA approaches defining a signaling pathway, single lab but multiple orthogonal methods","pmids":["31019507"],"is_preprint":false},{"year":2019,"finding":"Mecp2 binds to the Slpi promoter and negatively regulates Slpi expression in adipose tissue, thereby suppressing adipose tissue browning. Fat-specific Mecp2 knockout mice show upregulated Slpi and enhanced browning; knockdown of Slpi in inguinal WAT of Mecp2 KO mice prevented cold-induced browning. Recombinant SLPI treatment reduced HFD-induced obesity by enhancing browning.","method":"ChIP for Mecp2 binding to Slpi promoter, fat-specific Mecp2 knockout mouse, RNA-seq, Slpi knockdown in vivo, recombinant SLPI treatment in vivo","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-confirmed direct promoter binding, genetic knockout, in vivo knockdown rescue, and recombinant protein treatment, multiple orthogonal methods","pmids":["31597640"],"is_preprint":false},{"year":2019,"finding":"Endothelial cell-derived SLPI protects cardiomyocytes against ischemia/reperfusion injury via a paracrine mechanism. Co-culture of SLPI-overexpressing endothelial cells with cardiomyocytes or conditioned medium treatment enhanced cardiomyocyte viability, reduced intracellular ROS, decreased Bax/Bcl-2 ratio and caspase-3/8 levels, and activated p38 MAPK and Akt survival kinases.","method":"Stable endothelial cell overexpression of SLPI, co-culture and conditioned medium experiments, cell viability assay, ROS measurement, Western blot for apoptosis markers and signaling kinases","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — paracrine mechanism established by conditioned medium transfer, multiple molecular readouts, single lab","pmids":["31683729"],"is_preprint":false},{"year":2008,"finding":"Only chymase, among all SLPI-interacting proteases, uniquely cleaves SLPI at a specific site. In vitro enzymatic assays using Western blot and LC/MS demonstrated cleavage products that remain coupled via disulfide bonds under non-reducing conditions. Cleaved SLPI (cSLPI) was detected in human saliva and correlated with allergic symptoms, establishing cSLPI as a biomarker of chymase activity.","method":"In vitro enzymatic cleavage assay with multiple proteases, Western blot, LC/MS, analysis of human saliva samples, chymase inhibitor controls","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay with MS characterization of cleavage site, single lab","pmids":["18713008"],"is_preprint":false},{"year":2023,"finding":"Excessive dietary iron promotes colorectal tumorigenesis through upregulation of SLPI in intestinal epithelial cells, which in turn activates the MAPK signaling pathway as a pro-tumorigenic mechanism. This was demonstrated in multiple mouse colorectal cancer models with gut microbiota manipulation.","method":"Multiple mouse colorectal cancer models with dietary iron manipulation, gut microbiota analysis, Akkermansia supplementation, SLPI measurement and functional pathway analysis","journal":"Gut microbes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mouse models with mechanistic MAPK pathway readout, single lab","pmids":["37312410"],"is_preprint":false}],"current_model":"SLPI is a ~12 kDa, dual WAP-domain serine protease inhibitor whose C-terminal domain directly inhibits neutrophil elastase, cathepsin G, chymotrypsin, chymase, and tryptase; it is stored in neutrophil secondary granules and released upon activation, cross-linked to extracellular matrix by transglutaminases, and exerts anti-inflammatory effects independently of protease inhibition by suppressing NF-κB activation in macrophages, inhibiting ATP-mediated inflammasome/caspase-1-dependent IL-1β maturation via iPLA2β-nAChR-Src signaling, restraining B cell AID-dependent immunoglobulin class switching, and limiting NET formation through nuclear co-localization with neutrophil elastase and inhibition of histone H4 cleavage; its transcription is positively regulated by IL-1β, TNF-α, TLR2 (MyD88-independent), defensins, STAT1, and Nrf2 activation, while IRF-1 and Mecp2 repress it, and its activity is inactivated by oxidation from cigarette smoke."},"narrative":{"mechanistic_narrative":"SLPI is a small (~12 kDa), 107-residue secreted serine protease inhibitor built from two tandem WAP four-disulfide-core domains that broadly inhibits neutrophil elastase, cathepsin G, chymotrypsin, trypsin, mast cell chymase, and tryptase, with the protease-inhibitory active site residing in its C-terminal domain [PMID:3485543, PMID:3060147, PMID:8097952]. Beyond direct antiprotease function, SLPI is a pleiotropic anti-inflammatory factor: it dampens macrophage and B cell inflammatory responses by attenuating NF-κB signaling, and this immunomodulatory activity is genetically separable from protease inhibition, since active-site mutants and isolated domains that lack antiprotease activity still suppress LPS responses [PMID:12615907, PMID:16112212]. SLPI restrains adaptive and innate inflammation through several routes—inhibiting AID induction and immunoglobulin class switching in B cells [PMID:17259987], blocking ATP-driven inflammasome and caspase-1-dependent IL-1β release via an iPLA2β–nicotinic acetylcholine receptor–Src cascade [PMID:31019507], and limiting neutrophil extracellular trap formation by co-localizing with neutrophil elastase in the nucleus and inhibiting histone H4 cleavage [PMID:25917460]. It is synthesized in myelocytes and stored in neutrophil secondary granules alongside lactoferrin for rapid release upon activation, and once secreted it can be covalently cross-linked to fibronectin and elastin by transglutaminases while retaining antiprotease activity [PMID:18285402, PMID:21687692]. SLPI transcription is induced by IL-1β, TNF-α, TLR2 signaling (MyD88-independent), STAT1, TSLP, and Nrf2, and is repressed by IRF-1 and Mecp2, while its function is abolished by oxidative inactivation from cigarette smoke [PMID:7946401, PMID:16236128, PMID:24285265, PMID:21820333, PMID:23195333, PMID:10498899, PMID:31597640, PMID:11435216]. In disease contexts SLPI acts as a context-dependent regulator of epithelial repair, hematopoietic differentiation, and tumor behavior, including a protease-inhibition-independent induction of MMP-9 and promotion of tumor invasion [PMID:21820333, PMID:24352879, PMID:21676452].","teleology":[{"year":1986,"claim":"Established the molecular identity and architecture of SLPI, defining it as a two-WAP-domain disulfide-rich protein and unifying inhibitory activities isolated from multiple secretions as products of a single gene.","evidence":"Direct protein and cDNA sequencing from cervical tissue, plus in vitro inhibition assays against chymase and other proteases","pmids":["3485543","3530282","3060147"],"confidence":"High","gaps":["Did not resolve which domain carries inhibitory activity","No structural mechanism of inhibition"]},{"year":1993,"claim":"Localized the protease-inhibitory function to the C-terminal WAP domain, showing the isolated domain inhibits neutrophil elastase and cathepsin G.","evidence":"In vitro enzymatic inhibition and platelet activation assays with recombinant full-length and truncated SLPI","pmids":["8097952"],"confidence":"High","gaps":["Function of the N-terminal domain left undefined","Less potent than full-length, mechanism of cooperativity unclear"]},{"year":1998,"claim":"Mapped the SLPI gene structure and chromosomal location and identified the first transcriptional repressor (IRF-1), beginning the dissection of SLPI regulation.","evidence":"Genomic sequencing, FISH, RNA fingerprinting, EMSA, and promoter reporter assays","pmids":["9843921","10498899"],"confidence":"High","gaps":["Repression mechanism and physiological context of IRF-1 control not established"]},{"year":2001,"claim":"Demonstrated that SLPI antiprotease function is lost by oxidation, providing a mechanism for its inactivation in cigarette smoke exposure.","evidence":"In vivo mouse intratracheal recombinant SLPI with cigarette smoke and N-acetylcysteine rescue, BAL antitryptic activity","pmids":["11435216"],"confidence":"Medium","gaps":["Specific oxidized residues not identified in vivo","Single lab"]},{"year":2003,"claim":"Genetic knockout established SLPI as an endogenous restraint on NF-κB-mediated inflammation in macrophages and B cells in vivo.","evidence":"SLPI-/- mice, LPS challenge, macrophage cytokine and NF-κB reporter assays, B cell proliferation","pmids":["12615907"],"confidence":"High","gaps":["Molecular target by which SLPI inhibits NF-κB not defined","Did not separate protease-dependent from independent effects"]},{"year":2005,"claim":"Proved that SLPI's anti-inflammatory activity is independent of its antiprotease activity using active-site mutants and isolated domains.","evidence":"Site-directed mutagenesis (M73 variants) and domain truncations in stable RAW264.7 macrophages with LPS readouts","pmids":["16112212"],"confidence":"High","gaps":["Receptor/binding partner mediating immunomodulation not identified"]},{"year":2005,"claim":"Defined a TLR2-dependent, MyD88-independent induction pathway for SLPI, linking pathogen sensing to its expression.","evidence":"Macrophages from TLR2-/-, TLR4-/-, and MyD88-/- mice with M. tuberculosis stimulation","pmids":["16236128"],"confidence":"High","gaps":["MyD88-independent transcriptional effectors downstream of TLR2 not mapped"]},{"year":2007,"claim":"Showed SLPI acts as a homeostatic brake on adaptive immunity by inhibiting AID induction and immunoglobulin class switching in B cells.","evidence":"Human tonsillar explant and B cell-epithelial co-culture with AID and class-switch readouts and SLPI blocking","pmids":["17259987"],"confidence":"High","gaps":["Direct molecular link between SLPI and AID suppression unresolved"]},{"year":2008,"claim":"Identified SLPI as a neutrophil secondary granule protein co-stored and co-released with lactoferrin, defining its cellular reservoir in innate immunity.","evidence":"Microarray of bone marrow populations, subcellular fractionation, immunostaining, exocytosis assay","pmids":["18285402"],"confidence":"High","gaps":["Trafficking and sorting determinants to secondary granules not defined"]},{"year":2011,"claim":"Showed secreted SLPI is covalently cross-linked into the extracellular matrix by transglutaminases while retaining inhibitory activity, explaining its matrix association.","evidence":"In vitro transglutaminase cross-linking to fibronectin/elastin, mass spectrometry site mapping, activity assays","pmids":["21687692"],"confidence":"High","gaps":["Physiological significance of matrix-bound SLPI not tested in vivo"]},{"year":2011,"claim":"Established that SLPI can promote tumor invasion through protease-inhibition-independent MMP-9 induction, revealing a context-dependent pro-tumorigenic role.","evidence":"Protease-inhibitor-null SLPI mutant in ovarian cancer cells, invasion, MMP-9, xenograft, and tissue microarray","pmids":["21676452"],"confidence":"High","gaps":["Transcriptional pathway from SLPI to MMP-9 not defined","Receptor mediating the effect unknown"]},{"year":2011,"claim":"Identified TSLP-induced epithelial SLPI as required for mucosal healing, linking SLPI induction to control of neutrophil elastase damage in colitis.","evidence":"Tslp-/- mice, DSS colitis, bone marrow chimeras, NE inhibitor and rSLPI rescue","pmids":["21820333"],"confidence":"High","gaps":["Whether protection is purely via NE inhibition versus immunomodulation not fully separated"]},{"year":2013,"claim":"Showed SLPI controls myeloid progenitor proliferation, differentiation, and survival through NF-κB and ERK/LEF-1 signaling, and revealed reciprocal NE-SLPI regulation.","evidence":"shRNA knockdown in CD34+ progenitors, wild-type/mutant NE transduction, flow cytometry and pathway Western blots","pmids":["24352879"],"confidence":"High","gaps":["Direct molecular link between SLPI and ERK/LEF-1 activation unclear"]},{"year":2013,"claim":"Defined STAT1 as a direct transcriptional activator of SLPI binding its promoter, integrating SLPI expression into interferon-responsive epithelial signaling.","evidence":"ChIP, promoter reporter assays, Stat1-/- mice, expression analysis in smokers","pmids":["24285265"],"confidence":"High","gaps":["Interplay between STAT1 activation and IFN-γ-mediated suppression not reconciled"]},{"year":2015,"claim":"Demonstrated SLPI restrains NET formation by inhibiting nuclear histone H4 cleavage in co-localization with neutrophil elastase, defining a nuclear function in innate immunity.","evidence":"Human neutrophil NET assays, SLPI-/- neutrophils, H4 cleavage assay, nuclear immunofluorescence, psoriasis model","pmids":["25917460"],"confidence":"High","gaps":["Mechanism of SLPI nuclear entry not established"]},{"year":2019,"claim":"Resolved the signaling pathway by which SLPI blocks inflammasome activation, implicating iPLA2β, nicotinic acetylcholine receptors, and Src kinase upstream of caspase-1.","evidence":"Human monocytic cells with siRNA/inhibitors for iPLA2β, nAChR subunits, caspase-1 assays, Xenopus oocyte electrophysiology","pmids":["31019507"],"confidence":"Medium","gaps":["Identity of the low-molecular-mass mediator released by SLPI not defined","Direct SLPI receptor not identified"]},{"year":2019,"claim":"Identified Mecp2 as a direct promoter-binding repressor of SLPI controlling adipose browning, extending SLPI regulation to metabolic tissue.","evidence":"ChIP, fat-specific Mecp2 knockout, in vivo Slpi knockdown rescue, recombinant SLPI treatment","pmids":["31597640"],"confidence":"High","gaps":["Downstream effector of SLPI in browning not defined"]},{"year":null,"claim":"The cell-surface receptor(s) mediating SLPI's protease-independent immunomodulatory and signaling effects remain unidentified, leaving the mechanistic link between SLPI binding and intracellular NF-κB/ERK/MAPK outcomes unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined SLPI receptor across immune, hematopoietic, or tumor contexts","How SLPI accesses intracellular/nuclear compartments is unknown","Whether matrix-bound vs free SLPI signal differently is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,4,13,15]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,4]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[2,21]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[21]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[7,26]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[37]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[13,19,37,40]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[13,17,33]}],"complexes":[],"partners":["ELANE","TUBB1","ANXA2","RB1","FOXM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P03973","full_name":"Antileukoproteinase","aliases":["BLPI","HUSI-1","Mucus proteinase inhibitor","MPI","Protease inhibitor WAP4","Secretory leukocyte protease inhibitor","Seminal proteinase inhibitor","WAP four-disulfide core domain protein 4"],"length_aa":132,"mass_kda":14.3,"function":"Acid-stable proteinase inhibitor with strong affinities for trypsin, chymotrypsin, elastase, and cathepsin G (PubMed:10702419, PubMed:2039600, PubMed:2110563, PubMed:24121345, PubMed:3462719, PubMed:3533531). Modulates the inflammatory and immune responses after bacterial infection, and after infection by the intracellular parasite L.major. Down-regulates responses to bacterial lipopolysaccharide (LPS) (By similarity). Plays a role in regulating the activation of NF-kappa-B and inflammatory responses (PubMed:10702419, PubMed:24352879). Has antimicrobial activity against mycobacteria, but not against salmonella. Contributes to normal resistance against infection by M.tuberculosis. Required for normal resistance to infection by L.major. Required for normal wound healing, probably by preventing tissue damage by limiting protease activity (By similarity). Together with ELANE, required for normal differentiation and proliferation of bone marrow myeloid cells (PubMed:24352879)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P03973/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLPI","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/SLPI","total_profiled":1310},"omim":[{"mim_id":"617548","title":"WAP 4-DISULFIDE CORE DOMAIN 2; WFDC2","url":"https://www.omim.org/entry/617548"},{"mim_id":"612901","title":"TUBULIN, BETA-1; TUBB1","url":"https://www.omim.org/entry/612901"},{"mim_id":"609872","title":"WAP 4-DISULFIDE CORE DOMAIN 12; WFDC12","url":"https://www.omim.org/entry/609872"},{"mim_id":"606611","title":"DEFENSIN, BETA, 103A; DEFB103A","url":"https://www.omim.org/entry/606611"},{"mim_id":"600181","title":"LIPOCALIN 2; LCN2","url":"https://www.omim.org/entry/600181"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"cervix","ntpm":26260.0},{"tissue":"salivary gland","ntpm":14071.9}],"url":"https://www.proteinatlas.org/search/SLPI"},"hgnc":{"alias_symbol":["HUSI-I","ALK1","ALP","BLPI","HUSI","WAP4","WFDC4"],"prev_symbol":[]},"alphafold":{"accession":"P03973","domains":[{"cath_id":"-","chopping":"43-77","consensus_level":"medium","plddt":92.8809,"start":43,"end":77},{"cath_id":"4.10.75.10","chopping":"81-132","consensus_level":"medium","plddt":92.0373,"start":81,"end":132}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P03973","model_url":"https://alphafold.ebi.ac.uk/files/AF-P03973-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P03973-F1-predicted_aligned_error_v6.png","plddt_mean":85.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLPI","jax_strain_url":"https://www.jax.org/strain/search?query=SLPI"},"sequence":{"accession":"P03973","fasta_url":"https://rest.uniprot.org/uniprotkb/P03973.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P03973/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P03973"}},"corpus_meta":[{"pmid":"26121748","id":"PMC_26121748","title":"High IFN-γ and low SLPI mark severe asthma in mice and humans.","date":"2015","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/26121748","citation_count":332,"is_preprint":false},{"pmid":"7946401","id":"PMC_7946401","title":"Regulation of secretory leukocyte proteinase inhibitor (SLPI) and elastase-specific inhibitor (ESI/elafin) in human airway epithelial cells by cytokines and neutrophilic enzymes.","date":"1994","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/7946401","citation_count":249,"is_preprint":false},{"pmid":"17259987","id":"PMC_17259987","title":"Epithelial cells trigger frontline immunoglobulin class switching through a pathway regulated by the inhibitor SLPI.","date":"2007","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17259987","citation_count":225,"is_preprint":false},{"pmid":"3485543","id":"PMC_3485543","title":"The acid-stable proteinase inhibitor of human mucous secretions (HUSI-I, antileukoprotease). Complete amino acid sequence as revealed by protein and cDNA sequencing and structural homology to whey proteins and Red Sea turtle proteinase inhibitor.","date":"1986","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/3485543","citation_count":180,"is_preprint":false},{"pmid":"17964057","id":"PMC_17964057","title":"Multifaceted roles of human elafin and secretory leukocyte proteinase inhibitor (SLPI), two serine protease inhibitors of the chelonianin family.","date":"2007","source":"Biochimie","url":"https://pubmed.ncbi.nlm.nih.gov/17964057","citation_count":150,"is_preprint":false},{"pmid":"9456660","id":"PMC_9456660","title":"Secretory leukocyte protease inhibitor (SLPI) in mucosal fluids inhibits HIV-I.","date":"1997","source":"Oral diseases","url":"https://pubmed.ncbi.nlm.nih.gov/9456660","citation_count":134,"is_preprint":false},{"pmid":"26718149","id":"PMC_26718149","title":"Secretory leukocyte protease inhibitor (SLPI), a multifunctional protein in the host defense response.","date":"2015","source":"Cytokine & growth factor reviews","url":"https://pubmed.ncbi.nlm.nih.gov/26718149","citation_count":113,"is_preprint":false},{"pmid":"12615907","id":"PMC_12615907","title":"Increased susceptibility to LPS-induced endotoxin shock in secretory leukoprotease inhibitor (SLPI)-deficient mice.","date":"2003","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/12615907","citation_count":110,"is_preprint":false},{"pmid":"10645890","id":"PMC_10645890","title":"Regulation of SLPI and elafin release from bronchial epithelial cells by neutrophil defensins.","date":"2000","source":"American journal of physiology. 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Human seminal inhibitor I (HUSI-I), antileukoprotease (ALP), secretory leukocyte protease inhibitor (SLPI).","date":"1988","source":"Biological chemistry Hoppe-Seyler","url":"https://pubmed.ncbi.nlm.nih.gov/3060147","citation_count":95,"is_preprint":false},{"pmid":"9856807","id":"PMC_9856807","title":"Induction of SLPI (ALP/HUSI-I) in epidermal keratinocytes.","date":"1998","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/9856807","citation_count":95,"is_preprint":false},{"pmid":"21820333","id":"PMC_21820333","title":"Thymic stromal lymphopoetin-induced expression of the endogenous inhibitory enzyme SLPI mediates recovery from colonic inflammation.","date":"2011","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/21820333","citation_count":95,"is_preprint":false},{"pmid":"21936829","id":"PMC_21936829","title":"SLPI and elafin: multifunctional antiproteases of the WFDC family.","date":"2011","source":"Biochemical Society transactions","url":"https://pubmed.ncbi.nlm.nih.gov/21936829","citation_count":88,"is_preprint":false},{"pmid":"25917460","id":"PMC_25917460","title":"The inhibitory effect of secretory leukocyte protease inhibitor (SLPI) on formation of neutrophil extracellular traps.","date":"2015","source":"Journal of leukocyte biology","url":"https://pubmed.ncbi.nlm.nih.gov/25917460","citation_count":78,"is_preprint":false},{"pmid":"10381821","id":"PMC_10381821","title":"Secretory leukocyte protease inhibitor (SLPI) concentrations in cervical mucus of women with normal menstrual cycle.","date":"1999","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/10381821","citation_count":77,"is_preprint":false},{"pmid":"33602652","id":"PMC_33602652","title":"Secretory Leukocyte Protease Inhibitor (SLPI) in mucosal tissues: Protects against inflammation, but promotes cancer.","date":"2021","source":"Cytokine & growth factor reviews","url":"https://pubmed.ncbi.nlm.nih.gov/33602652","citation_count":69,"is_preprint":false},{"pmid":"18397461","id":"PMC_18397461","title":"The lower genital tract microbiota in relation to cytokine-, SLPI- and endotoxin levels: application of checkerboard DNA-DNA hybridization (CDH).","date":"2008","source":"APMIS : acta pathologica, microbiologica, et immunologica Scandinavica","url":"https://pubmed.ncbi.nlm.nih.gov/18397461","citation_count":62,"is_preprint":false},{"pmid":"12692864","id":"PMC_12692864","title":"The secretory leukoprotease inhibitor (SLPI) promoter for ovarian cancer gene therapy.","date":"2003","source":"The journal of gene medicine","url":"https://pubmed.ncbi.nlm.nih.gov/12692864","citation_count":54,"is_preprint":false},{"pmid":"10979241","id":"PMC_10979241","title":"Regulation of secretory leukocyte proteinase inhibitor (SLPI) production by human bronchial epithelial cells: increase of cell-associated SLPI by neutrophil elastase.","date":"2000","source":"Journal of investigative medicine : the official publication of the American Federation for Clinical Research","url":"https://pubmed.ncbi.nlm.nih.gov/10979241","citation_count":53,"is_preprint":false},{"pmid":"15858026","id":"PMC_15858026","title":"Human immunodeficiency virus type 1 stimulates the expression and production of secretory leukocyte protease inhibitor (SLPI) in oral epithelial cells: a role for SLPI in innate mucosal immunity.","date":"2005","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/15858026","citation_count":51,"is_preprint":false},{"pmid":"24352879","id":"PMC_24352879","title":"A lack of secretory leukocyte protease inhibitor (SLPI) causes defects in granulocytic differentiation.","date":"2013","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/24352879","citation_count":48,"is_preprint":false},{"pmid":"17574828","id":"PMC_17574828","title":"Serum and bronchial lavage fluid concentrations of IL-8, SLPI, sCD14 and sICAM-1 in patients with COPD and asthma.","date":"2007","source":"Respiratory medicine","url":"https://pubmed.ncbi.nlm.nih.gov/17574828","citation_count":47,"is_preprint":false},{"pmid":"3530282","id":"PMC_3530282","title":"Inhibition of mast cell chymase by eglin c and antileukoprotease (HUSI-I). Indications for potential biological functions of these inhibitors.","date":"1986","source":"Biological chemistry Hoppe-Seyler","url":"https://pubmed.ncbi.nlm.nih.gov/3530282","citation_count":46,"is_preprint":false},{"pmid":"21641406","id":"PMC_21641406","title":"Secretory leukocyte protease inhibitor (SLPI) expression and tumor invasion in oral squamous cell carcinoma.","date":"2011","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/21641406","citation_count":46,"is_preprint":false},{"pmid":"14500739","id":"PMC_14500739","title":"Up-regulation of secretory leukocyte protease inhibitor (SLPI) in the brain after ischemic stroke: adenoviral expression of SLPI protects brain from ischemic injury.","date":"2003","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/14500739","citation_count":45,"is_preprint":false},{"pmid":"11435216","id":"PMC_11435216","title":"Human SLPI inactivation after cigarette smoke exposure in a new in vivo model of pulmonary oxidative stress.","date":"2001","source":"American journal of physiology. 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The complete sequence was determined by both direct protein sequencing and cDNA sequencing from cervical tissue mRNA.\",\n      \"method\": \"Direct protein sequencing and cDNA cloning/sequencing\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct protein sequencing combined with cDNA sequencing, foundational structural determination replicated across two orthogonal methods\",\n      \"pmids\": [\"3485543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"SLPI inhibits mast cell chymase; equimolar concentrations (~10 nM) of chymase and SLPI result in rapid complex formation, with 50% inhibition of chymase activity requiring ~700 nM SLPI (dissociation constant ~44 nM for the eglin c-chymase complex for comparison). SLPI thus functions as a direct inhibitor of mast cell chymase.\",\n      \"method\": \"In vitro enzymatic inhibition assay with purified proteins\",\n      \"journal\": \"Biological chemistry Hoppe-Seyler\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzymatic assay with purified SLPI and chymase, quantitative Ki determination\",\n      \"pmids\": [\"3530282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"SLPI inhibits trypsin, chymotrypsin, granulocytic elastase, cathepsin G, mast cell chymase, and tryptase. The various forms isolated from different secretions (bronchial mucus, seminal plasma, cervical mucus, parotid secretion) are identical or derived from a single gene product.\",\n      \"method\": \"Biochemical characterization and enzymatic inhibition assays\",\n      \"journal\": \"Biological chemistry Hoppe-Seyler\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic assays, replicated across multiple laboratories and tissue sources\",\n      \"pmids\": [\"3060147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"After intravenous injection, SLPI is rapidly cleared from plasma with an initial half-life of ~10 minutes, followed by slower clearance (~60-120 min). Radioactivity accumulated predominantly in kidneys, and renal metabolism of SLPI was demonstrated. Intact SLPI was not detected in urine, indicating renal catabolism rather than filtration.\",\n      \"method\": \"Radiolabeled (35S and 125I) SLPI pharmacokinetics in dogs and human volunteers, organ biodistribution\",\n      \"journal\": \"Scandinavian journal of clinical and laboratory investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vivo pharmacokinetics with radiolabeled protein in two species, single lab\",\n      \"pmids\": [\"2293334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The C-terminal domain of SLPI (half-SLPI, Asn55-Ala107) alone is sufficient to inhibit neutrophil elastase and cathepsin G, and to inhibit cathepsin G-mediated platelet activation and PMN-mediated platelet activation, though less potently than full-length SLPI. This establishes the catalytic/inhibitory site resides in the C-terminal domain.\",\n      \"method\": \"In vitro enzymatic inhibition assay and platelet activation assay using recombinant full-length and truncated SLPI\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro assay with recombinant truncated proteins and multiple functional readouts, single lab\",\n      \"pmids\": [\"8097952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"IL-1β and TNF-α induce significant SLPI expression in human airway epithelial cell lines (A549 and NCI-H322), identifying these cytokines as major transcriptional inducers of SLPI in the lung epithelium.\",\n      \"method\": \"Cell culture stimulation with cytokines, protein measurement in supernatants\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, single method (protein measurement), but replicated in two cell lines\",\n      \"pmids\": [\"7946401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"SLPI purified from saliva or produced as recombinant protein inhibits HIV-1 infection of human monocytes in vitro at 100 ng/mL. Salivary levels of SLPI exceed this threshold, consistent with in vivo antiviral activity. Breast milk SLPI levels were insufficient to provide antiviral protection except in colostrum.\",\n      \"method\": \"In vitro HIV-1 infection assay with purified native and recombinant SLPI, ELISA quantification, Northern blot and immunohistochemistry\",\n      \"journal\": \"Oral diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro inhibition assay with both native and recombinant protein, multiple methods, single lab\",\n      \"pmids\": [\"9456660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SLPI is inducibly expressed in migrating keratinocytes of healing wounds and in lesional psoriatic epidermis, but not in proliferating keratinocytes. Extracellular SLPI was found associated with elastin fibers in the dermis adjacent to SLPI-expressing keratinocytes. Recombinant SLPI exhibited antibacterial activity with a distinct spectrum compared to lysozyme and defensins.\",\n      \"method\": \"Immunohistochemistry, in situ hybridization, cell culture differentiation assays, antibacterial functional assays\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (IHC, ISH, functional assay), single lab\",\n      \"pmids\": [\"9856807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SLPI gene is organized into four exons and three introns spanning ~2.2 kb with a transcription start site located 20 nt upstream of the ATG initiation codon. The human SLPI gene maps to chromosome 20q12-13.2 and the mouse homologue to chromosome 2H by fluorescence in situ hybridization.\",\n      \"method\": \"Genomic DNA sequencing, primer extension analysis, FISH\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct genomic sequencing plus FISH chromosomal localization, two orthogonal methods\",\n      \"pmids\": [\"9843921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"IRF-1 transcriptionally represses SLPI expression. RNA fingerprinting identified SLPI as downregulated upon IRF-1 induction; an ISRE-like binding site was mapped to the -221 to -200 region of the SLPI promoter to which IRF-1 binds, and co-transfection studies demonstrated that IRF-1 co-expression inhibits SLPI promoter activity.\",\n      \"method\": \"RNA fingerprinting, promoter deletion analysis, electrophoretic mobility shift assay (EMSA), co-transfection/reporter assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (RNA fingerprinting, EMSA, co-transfection reporter), single lab\",\n      \"pmids\": [\"10498899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Neutrophil elastase (NE) increases SLPI mRNA levels in primary bronchial epithelial cells while simultaneously decreasing SLPI protein in supernatants by promoting accumulation of cell-associated SLPI. This apparent paradox is explained by NE causing SLPI retention at the cell surface rather than inhibiting SLPI synthesis.\",\n      \"method\": \"Primary bronchial epithelial cell culture, Northern blot, ELISA of supernatants and cell lysates\",\n      \"journal\": \"Journal of investigative medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — primary cells, two orthogonal readouts (mRNA and protein in supernatant vs. cell fraction), single lab\",\n      \"pmids\": [\"10979241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Neutrophil-derived alpha-defensins increase SLPI protein release from primary bronchial epithelial cells in a time- and dose-dependent manner without affecting SLPI mRNA levels, indicating post-transcriptional or post-translational regulation. Alpha-1-proteinase inhibitor further enhanced defensin-induced SLPI release.\",\n      \"method\": \"Primary bronchial epithelial cell culture, ELISA, Northern blot\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — primary cells, orthogonal protein and mRNA measurements, single lab\",\n      \"pmids\": [\"10645890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Cigarette smoke oxidatively inactivates human SLPI in vivo. In a mouse model, intratracheal human recombinant SLPI's antitryptic inhibitory activity was reduced by 50% following cigarette smoke exposure; this inactivation was prevented by N-acetylcysteine pretreatment, demonstrating oxidation-dependent loss of SLPI function.\",\n      \"method\": \"In vivo mouse model, bronchoalveolar lavage fluid antitryptic activity assay, oxidative stress markers\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo functional assay, prevention by antioxidant confirms oxidative mechanism, single lab\",\n      \"pmids\": [\"11435216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SLPI-deficient (SLPI-/-) mice show increased mortality from LPS-induced endotoxin shock. Mechanistically, SLPI-/- macrophages produce higher IL-6 and HMGB1 and show greater NF-κB activity after LPS treatment. SLPI-/- B cells show more proliferation and IgM production after LPS, demonstrating that endogenous SLPI attenuates NF-κB-mediated inflammatory responses.\",\n      \"method\": \"SLPI knockout mouse model, LPS challenge, macrophage culture, ELISA for cytokines, NF-κB reporter assay, B cell proliferation assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined cellular phenotypes and mechanism (NF-κB), multiple cell types and readouts, published in top journal\",\n      \"pmids\": [\"12615907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SLPI interacts physically with platelet-restricted β1-tubulin, discovered by yeast two-hybrid screen of megakaryocyte cDNAs. In megakaryocytes and platelets, a fraction of SLPI co-localizes along peripheral microtubules in a β1-tubulin-dependent manner (lost in β1-tubulin-/- platelets and upon cold-induced MT disruption). SLPI is released upon platelet activation and its elastase-inhibitory activity is reduced in the absence of β1-tubulin, suggesting regulated anti-proteolytic function at platelet activation.\",\n      \"method\": \"Yeast two-hybrid screen, immunofluorescence, subcellular fractionation, platelet activation assay, β1-tubulin knockout mouse\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast 2-hybrid discovery confirmed by immunofluorescence, fractionation, and knockout mouse, multiple orthogonal methods\",\n      \"pmids\": [\"15315966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SLPI's suppression of macrophage LPS responses (NO and TNF production) is independent of its anti-protease activity. Single amino acid substitution mutants of SLPI (M73G, M73F, M73E, M73K) that selectively lose elastase and/or chymotrypsin inhibitory activity still suppress LPS responses similarly to wild-type SLPI. Truncated forms containing only the N-terminus or C-terminus are individually sufficient to confer LPS inhibition.\",\n      \"method\": \"Site-directed mutagenesis of SLPI active site, stable transfection of RAW264.7 macrophages, LPS stimulation assay, NO and TNF measurement\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — active-site mutagenesis with multiple mutants, domain truncation experiments, functional readouts in stable cell lines\",\n      \"pmids\": [\"16112212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HIV-1-mediated stimulation of SLPI expression and production in oral epithelial cells occurs at the transcriptional level, is dose- and time-dependent, is induced by heat-inactivated and infectious virus equally, and does not depend on cellular infection. The stimulatory effect is specifically induced by HIV-1 and SIV envelope glycoproteins (gp120), not other viral proteins.\",\n      \"method\": \"Real-time RT-PCR, ELISA, heat-inactivated virus controls, purified retroviral protein experiments, primary oral epithelial cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods, primary cells validation, mechanism narrowed to gp120 interaction, single lab\",\n      \"pmids\": [\"15858026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Induction of SLPI in macrophages by Mycobacterium tuberculosis depends on TLR2 but not TLR4 or MyD88. Macrophages from TLR2-/- mice failed to upregulate SLPI in response to heat-killed M. tuberculosis, while TLR4-/- and MyD88-/- macrophages responded normally, identifying a TLR2-dependent, MyD88-independent signaling pathway for SLPI induction.\",\n      \"method\": \"Macrophages from TLR2-/-, TLR4-/-, MyD88-/- knockout mice, real-time PCR and ELISA for SLPI expression\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using multiple knockout mice with defined molecular pathway, multiple readouts\",\n      \"pmids\": [\"16236128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"H3-K4 trimethylation across the SLPI coding region is enhanced by IL-1β stimulation and correlates with increased RNA polymerase II recruitment to the SLPI gene. The methylase inhibitor 5-azacytidine attenuates both H3-K4 trimethylation and RNA Pol II recruitment, reducing SLPI mRNA and protein levels, demonstrating that histone H3-K4 methylation regulates SLPI transcriptional induction.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), Western blot, SLPI promoter reporter assay, 5-azacytidine pharmacological inhibition\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with pharmacological validation and reporter assay, single lab\",\n      \"pmids\": [\"15845363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Epithelial cell-derived SLPI restrains B cell immunoglobulin class switching by inhibiting AID induction in B cells. SLPI acts as a homeostatic brake on Toll-like receptor-induced class switching in tonsillar B cells.\",\n      \"method\": \"Human tonsillar explant cultures, B cell-epithelial co-culture experiments, AID measurement, immunoglobulin class-switching assays, SLPI blocking experiments\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct functional experiments with primary human cells, multiple readouts, published in top-tier journal\",\n      \"pmids\": [\"17259987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SLPI suppresses cancer cell invasion in vitro while promoting blood-borne metastasis via an invasion-independent pathway. Overexpression of SLPI in mammary tumor cells induced sinusoidal vasculature and endothelial-coated tumor emboli in vivo, associated with SLPI's anti-migratory effect on endothelial cells. SLPI inhibited migration of both tumor cells and HUVECs through Matrigel.\",\n      \"method\": \"SLPI gene transfection into MCH66 mouse mammary tumor cells, in vivo tumor implantation, Matrigel invasion/migration assays, in vivo angiogenesis assay\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro experiments, multiple functional readouts, single lab\",\n      \"pmids\": [\"17455170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SLPI is synthesized in myelocytes and co-localizes with lactoferrin in secondary granules of neutrophils, as determined by subcellular fractionation. SLPI is co-released with lactoferrin within minutes of neutrophil activation, establishing SLPI as a secondary granule protein in PMNs.\",\n      \"method\": \"Microarray expression profiling of bone marrow populations, immunostaining of bone marrow cells, subcellular fractionation, exocytosis assay\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — subcellular fractionation with co-localization, exocytosis studies, microarray expression data across differentiation stages, multiple orthogonal methods\",\n      \"pmids\": [\"18285402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NE-mediated decrease in SLPI in cell culture supernatants is a passive, charge-dependent phenomenon. Theoretical molecular modeling showed that the NE-SLPI complex has a greater positive charge than complexes of SLPI with other proteinases (trypsin, tryptase), correlating with the selective ability of NE and cathepsin G (but not other proteinases) to reduce secreted SLPI levels by promoting complex binding to negatively-charged cell membranes.\",\n      \"method\": \"Respiratory epithelial cell culture, ELISA, synthetic NE inhibitor controls, theoretical molecular modeling of charge\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combination of in vitro cell experiments and computational modeling, mechanism identified by pharmacological controls, single lab\",\n      \"pmids\": [\"18699987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SLPI plays a crucial role in early myocardial performance after ischemia/reperfusion in cardiac transplantation. SLPI-/- hearts showed profoundly impaired early contractility after cold ischemia, associated with high intra-graft protease expression. rSLPI added to preservation solution (but not systemic administration) restored normal myocardial contraction. Intra-graft SLPI inversely correlated with protease levels and TGF-β expression.\",\n      \"method\": \"SLPI-/- mouse heterotopic cardiac transplantation model, recombinant SLPI administration, myocardial performance assessment, histology, ELISA for TNF-α, TGF-β, protease levels\",\n      \"journal\": \"American journal of transplantation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus recombinant protein rescue, multiple molecular readouts, single lab\",\n      \"pmids\": [\"18294346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SLPI promotes proliferation and oligodendroglial differentiation of adult neural stem cells. Recombinant SLPI treatment increased cell proliferation (BrdU incorporation), upregulated cyclin D1, suppressed HES1, and prevented degradation of IκBα in neural stem cells, suggesting NF-κB pathway inhibition as a mechanism underlying oligodendroglial differentiation.\",\n      \"method\": \"Adult neural stem cell culture, recombinant SLPI treatment, BrdU incorporation, real-time PCR for cyclin D1 and HES1, Western blot for IκBα, immunofluorescence\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods in primary neural stem cells, single lab\",\n      \"pmids\": [\"18501024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Protein disulfide isomerase (PDI) overexpression enhances SLPI folding in Pichia pastoris, increasing SLPI yield >5-fold and enhancing its specific anti-protease activity. Mass spectrometry confirmed a greater number of disulfide bonds in PDI-overexpression-derived SLPI, demonstrating that proper disulfide bond formation is required for SLPI biological activity.\",\n      \"method\": \"Recombinant protein expression in Pichia pastoris, mass spectrometry disulfide bond analysis, anti-protease activity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mass spectrometry plus functional activity assay, demonstrates disulfide-dependent folding requirement, single lab\",\n      \"pmids\": [\"20971072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SLPI is a substrate for tissue transglutaminase (type 2) and plasma transglutaminase (factor XIIIa), which covalently cross-link it to fibronectin and elastin. Cross-linked SLPI retains its ability to inhibit elastase and cathepsin G. Mass spectrometry identified transglutamination sites: reactive lysine and glutamine residues are located predominantly in SLPI's N-terminal domain.\",\n      \"method\": \"In vitro transglutaminase cross-linking assay, mass spectrometry of tryptic digests, enzymatic activity assay of cross-linked SLPI\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with mass spectrometry site identification and functional retention assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"21687692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TSLP signaling through TSLP receptor on intestinal epithelial cells (non-hematopoietic cells) induces SLPI expression, and this SLPI induction is required for mucosal healing after DSS-induced colitis. TSLP-deficient mice failed to recover from colitis and showed increased neutrophil elastase (NE) activity and reduced SLPI; pharmacological NE inhibition or rSLPI treatment rescued mortality in Tslp-/- mice.\",\n      \"method\": \"Tslp-/- mouse model, DSS colitis, rSLPI treatment, NE pharmacological inhibitor, bone marrow chimera experiments (TSLPR on non-hematopoietic cells)\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout, chimera epistasis, pharmacological rescue with defined cellular pathway, published in high-impact journal\",\n      \"pmids\": [\"21820333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SLPI promotes tumor invasion in ovarian cancer by inducing MMP-9 transcription and protein production independent of its serine protease inhibitory activity. A protease-inhibitor-null SLPI mutant (F-SLPI) similarly induces MMP-9 transcription and increases invasion. Wild-type SLPI additionally inhibits plasmin activity and MMP-9 activation, yielding net increased MMP-9 activity. SLPI and MMP-9 are strongly correlated in serous ovarian cancers.\",\n      \"method\": \"Stable HEYA8 ovarian cancer transfectants with wild-type and protease-inhibitor-null SLPI, invasion assay, MMP-9 transcription/protein/activity assay, plasmin activity assay, xenograft model, tissue microarray\",\n      \"journal\": \"Gynecologic oncology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — protease-inhibitor-null mutant distinguishes mechanisms, in vitro and in vivo readouts, tissue correlation, multiple orthogonal methods\",\n      \"pmids\": [\"21676452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SLPI is produced in human mast cells. Double-immunolabeling showed SLPI coexists with tryptase (60%) and chymase (37%)-containing mast cells, and in situ hybridization confirmed SLPI mRNA expression in all mast cells, suggesting SLPI acts as a local regulator of mast cell protease activity.\",\n      \"method\": \"Double immunolabeling, in situ hybridization\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods for localization, single lab\",\n      \"pmids\": [\"10355635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SLPI inhibits regulatory T cell differentiation. In vitro addition of SLPI to naive human CD4+ T cell cultures significantly decreased the number of functional FoxP3+ CD25hi CD4+ regulatory T cells. Recombinant TGF-β neutralized SLPI's inhibitory effect on Treg differentiation, placing SLPI upstream of TGF-β in this pathway. In vivo, SLPI neutralization in EAE increased serum TGF-β and FoxP3+ T cells.\",\n      \"method\": \"Human CD4+ T cell culture with recombinant SLPI, SLPI-neutralizing antibody in EAE mouse and rat model, flow cytometry, ELISA for TGF-β, TGF-β rescue experiment\",\n      \"journal\": \"BMC neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic rescue plus in vivo validation, multiple readouts, single lab\",\n      \"pmids\": [\"22436018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nrf2 transcriptionally regulates SLPI expression in nasal epithelial cells. Sulforaphane (SFN, an Nrf2 activator) significantly enhanced SLPI secretion in vitro, and this effect was significantly reduced by Nrf2-specific shRNA knockdown, establishing Nrf2 as a direct regulator of SLPI transcription.\",\n      \"method\": \"Nasal lavage fluid ELISA after sulforaphane ingestion, differentiated primary nasal epithelial cells, Nrf2 shRNA knockdown, SLPI ELISA\",\n      \"journal\": \"Respiratory medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo + in vitro with shRNA knockdown of regulator, single lab\",\n      \"pmids\": [\"23195333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SLPI controls myeloid cell proliferation, differentiation, and cell cycle. Downregulation of SLPI with shRNA in CD34+ hematopoietic progenitors reduced myeloid differentiation, caused cell-cycle arrest, and elevated apoptosis. Mechanistically, SLPI knockdown upregulated NF-κB and reduced phospho-ERK1/2-mediated phosphorylation/activation of LEF-1 transcription factor. Wild-type NE (but not mutant forms) upregulated SLPI, establishing reciprocal NE-SLPI regulation.\",\n      \"method\": \"shRNA knockdown of SLPI in CD34+ bone marrow progenitors, neutrophil elastase transduction (wild-type and mutant), flow cytometry for differentiation/apoptosis/cell-cycle, Western blot for NF-κB and p-ERK1/2, microarray analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — shRNA loss-of-function in primary cells plus mutant NE rescue experiments, multiple pathway-level readouts, replicated in patient samples\",\n      \"pmids\": [\"24352879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"STAT1 transcriptionally regulates SLPI expression in airway epithelial cells. STAT1 promoter reporter assays and chromatin immunoprecipitation confirmed STAT1 binding to the SLPI promoter. Stat1-/- mice showed reduced pulmonary Slpi protein. Smokers have increased STAT1 mRNA/protein in nasal epithelial cells, explaining their increased SLPI expression.\",\n      \"method\": \"SLPI promoter reporter assays, chromatin immunoprecipitation (ChIP), stat1-/- mouse model, Western blot and RT-PCR\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus reporter assays plus genetic knockout mouse, multiple orthogonal methods confirming STAT1-SLPI regulatory axis\",\n      \"pmids\": [\"24285265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SLPI functions as a novel inhibitor of plasminogen activation through its interaction with annexin A2, with concomitant reduction in plasmin generation by macrophages and OSCC cell lines. In vitro, SLPI blocked protease-dependent tumor cell migration.\",\n      \"method\": \"Co-immunoprecipitation of SLPI with annexin A2, plasmin generation assay with macrophages and cell lines, in vitro invasion assay\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional plasmin assay plus invasion assay, single lab\",\n      \"pmids\": [\"21641406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SLPI exerts antifungal activity against Candida albicans, including reducing secreted serine proteinase activity by 48.8%, reducing adhesion to mammalian cells by 60.1%, reducing cell surface mannoprotein expression, and causing ultrastructural changes (membrane-like structures in cytoplasm). Flow cytometry suggested specific SLPI binding sites on the yeast surface.\",\n      \"method\": \"MIC determination, serine proteinase activity assay, flow cytometry for surface receptors and mannoproteins, adhesion assay, transmission electron microscopy\",\n      \"journal\": \"Archives of oral biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays and structural analysis, single lab\",\n      \"pmids\": [\"24907522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IFN-γ inversely regulates SLPI expression, defining a dysregulated IFN-γ/SLPI axis in severe asthma. In a severe asthma mouse model, forced SLPI expression decreased airway hyperresponsiveness (AHR) independent of corticosteroids, and combining SLPI with CS further reduced AHR. Pathway analysis linked IFN-γ to SLPI suppression, confirmed in both SA patients and the mouse model.\",\n      \"method\": \"Computer-assisted pathway analysis, severe asthma mouse model with Ifng-/- and Il17ra-/- mice, adenoviral SLPI overexpression, airway hyperresponsiveness measurement (AHR), BAL analysis from human SA and MMA patients\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout mice plus forced expression rescue, human patient validation, multiple orthogonal methods\",\n      \"pmids\": [\"26121748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SLPI inhibits NET (neutrophil extracellular trap) formation in human neutrophils in a manner partially dependent on its NE-inhibitory activity. SLPI inhibits histone H4 (H4) cleavage during NET formation. SLPI-/- mouse neutrophils are more efficient at generating NETs than WT neutrophils in vitro and in experimental psoriasis in vivo. Endogenous SLPI co-localizes with NE in the nucleus of human neutrophils both in vitro and in psoriatic skin.\",\n      \"method\": \"Human neutrophil NET assay with recombinant SLPI, SLPI-/- mouse neutrophils, histone H4 cleavage assay, immunofluorescence co-localization, experimental psoriasis model\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (in vitro human, knockout mouse in vitro and in vivo), mechanistic dissection of NE-dependence and nuclear co-localization\",\n      \"pmids\": [\"25917460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SLPI physically interacts with the retinoblastoma tumor suppressor protein (Rb) and releases FoxM1 from the Rb-FoxM1 complex, potentially activating FoxM1 target genes involved in breast cancer metastasis. SLPI secretion was identified as a target of a novel compound (C74) that inhibits SLPI secretion, reducing tumor growth and lung metastasis.\",\n      \"method\": \"High-throughput screening for SLPI secretion inhibitors, co-immunoprecipitation of SLPI with Rb, FoxM1 complex disruption assay, orthotopic 4T1 mouse tumor model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for SLPI-Rb interaction plus in vivo functional validation, single lab\",\n      \"pmids\": [\"29312532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SLPI promotes osteoblast focal adhesion on titanium surfaces. Recombinant SLPI treatment of MC3T3-E1 cells on titanium increased actin stress fibers, paxillin expression, FAK phosphorylation, and ERK1/2 phosphorylation through Grb2-Ras signaling, establishing SLPI as an activator of integrin-FAK-ERK signaling for cell adhesion.\",\n      \"method\": \"MC3T3-E1 osteoblast culture on titanium, recombinant SLPI treatment, immunofluorescence for actin/paxillin, Western blot for FAK, Grb2, Ras, ERK1/2 phosphorylation\",\n      \"journal\": \"Journal of nanoscience and nanotechnology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, correlative Western blot readouts without receptor identification or pathway validation\",\n      \"pmids\": [\"26328330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SLPI dose-dependently inhibits ATP-mediated inflammasome activation and IL-1β release in human monocytic cells without affecting pro-IL-1β mRNA induction by LPS. The mechanism involves activation of calcium-independent phospholipase A2β (iPLA2β), release of a low-molecular-mass mediator, signaling through nicotinic acetylcholine receptor subunits α7, α9, α10, and Src kinase activation, resulting in inhibition of ATP-induced caspase-1 activation. SLPI does not directly modulate P2X7 receptor ion channel function in Xenopus oocytes but inhibits ATP-induced ion currents in human U937 cells.\",\n      \"method\": \"Human monocytic cell culture, ELISA for IL-1β, RT-PCR for pro-IL-1β, specific inhibitors and siRNA for iPLA2β, nicotinic receptor subunit siRNA, caspase-1 activity assay, Xenopus oocyte electrophysiology\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological and siRNA approaches defining a signaling pathway, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"31019507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mecp2 binds to the Slpi promoter and negatively regulates Slpi expression in adipose tissue, thereby suppressing adipose tissue browning. Fat-specific Mecp2 knockout mice show upregulated Slpi and enhanced browning; knockdown of Slpi in inguinal WAT of Mecp2 KO mice prevented cold-induced browning. Recombinant SLPI treatment reduced HFD-induced obesity by enhancing browning.\",\n      \"method\": \"ChIP for Mecp2 binding to Slpi promoter, fat-specific Mecp2 knockout mouse, RNA-seq, Slpi knockdown in vivo, recombinant SLPI treatment in vivo\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-confirmed direct promoter binding, genetic knockout, in vivo knockdown rescue, and recombinant protein treatment, multiple orthogonal methods\",\n      \"pmids\": [\"31597640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Endothelial cell-derived SLPI protects cardiomyocytes against ischemia/reperfusion injury via a paracrine mechanism. Co-culture of SLPI-overexpressing endothelial cells with cardiomyocytes or conditioned medium treatment enhanced cardiomyocyte viability, reduced intracellular ROS, decreased Bax/Bcl-2 ratio and caspase-3/8 levels, and activated p38 MAPK and Akt survival kinases.\",\n      \"method\": \"Stable endothelial cell overexpression of SLPI, co-culture and conditioned medium experiments, cell viability assay, ROS measurement, Western blot for apoptosis markers and signaling kinases\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — paracrine mechanism established by conditioned medium transfer, multiple molecular readouts, single lab\",\n      \"pmids\": [\"31683729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Only chymase, among all SLPI-interacting proteases, uniquely cleaves SLPI at a specific site. In vitro enzymatic assays using Western blot and LC/MS demonstrated cleavage products that remain coupled via disulfide bonds under non-reducing conditions. Cleaved SLPI (cSLPI) was detected in human saliva and correlated with allergic symptoms, establishing cSLPI as a biomarker of chymase activity.\",\n      \"method\": \"In vitro enzymatic cleavage assay with multiple proteases, Western blot, LC/MS, analysis of human saliva samples, chymase inhibitor controls\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay with MS characterization of cleavage site, single lab\",\n      \"pmids\": [\"18713008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Excessive dietary iron promotes colorectal tumorigenesis through upregulation of SLPI in intestinal epithelial cells, which in turn activates the MAPK signaling pathway as a pro-tumorigenic mechanism. This was demonstrated in multiple mouse colorectal cancer models with gut microbiota manipulation.\",\n      \"method\": \"Multiple mouse colorectal cancer models with dietary iron manipulation, gut microbiota analysis, Akkermansia supplementation, SLPI measurement and functional pathway analysis\",\n      \"journal\": \"Gut microbes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mouse models with mechanistic MAPK pathway readout, single lab\",\n      \"pmids\": [\"37312410\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLPI is a ~12 kDa, dual WAP-domain serine protease inhibitor whose C-terminal domain directly inhibits neutrophil elastase, cathepsin G, chymotrypsin, chymase, and tryptase; it is stored in neutrophil secondary granules and released upon activation, cross-linked to extracellular matrix by transglutaminases, and exerts anti-inflammatory effects independently of protease inhibition by suppressing NF-κB activation in macrophages, inhibiting ATP-mediated inflammasome/caspase-1-dependent IL-1β maturation via iPLA2β-nAChR-Src signaling, restraining B cell AID-dependent immunoglobulin class switching, and limiting NET formation through nuclear co-localization with neutrophil elastase and inhibition of histone H4 cleavage; its transcription is positively regulated by IL-1β, TNF-α, TLR2 (MyD88-independent), defensins, STAT1, and Nrf2 activation, while IRF-1 and Mecp2 repress it, and its activity is inactivated by oxidation from cigarette smoke.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLPI is a small (~12 kDa), 107-residue secreted serine protease inhibitor built from two tandem WAP four-disulfide-core domains that broadly inhibits neutrophil elastase, cathepsin G, chymotrypsin, trypsin, mast cell chymase, and tryptase, with the protease-inhibitory active site residing in its C-terminal domain [#0, #2, #4]. Beyond direct antiprotease function, SLPI is a pleiotropic anti-inflammatory factor: it dampens macrophage and B cell inflammatory responses by attenuating NF-\\u03baB signaling, and this immunomodulatory activity is genetically separable from protease inhibition, since active-site mutants and isolated domains that lack antiprotease activity still suppress LPS responses [#13, #15]. SLPI restrains adaptive and innate inflammation through several routes\\u2014inhibiting AID induction and immunoglobulin class switching in B cells [#19], blocking ATP-driven inflammasome and caspase-1-dependent IL-1\\u03b2 release via an iPLA2\\u03b2\\u2013nicotinic acetylcholine receptor\\u2013Src cascade [#40], and limiting neutrophil extracellular trap formation by co-localizing with neutrophil elastase in the nucleus and inhibiting histone H4 cleavage [#37]. It is synthesized in myelocytes and stored in neutrophil secondary granules alongside lactoferrin for rapid release upon activation, and once secreted it can be covalently cross-linked to fibronectin and elastin by transglutaminases while retaining antiprotease activity [#21, #26]. SLPI transcription is induced by IL-1\\u03b2, TNF-\\u03b1, TLR2 signaling (MyD88-independent), STAT1, TSLP, and Nrf2, and is repressed by IRF-1 and Mecp2, while its function is abolished by oxidative inactivation from cigarette smoke [#5, #17, #33, #27, #31, #9, #41, #12]. In disease contexts SLPI acts as a context-dependent regulator of epithelial repair, hematopoietic differentiation, and tumor behavior, including a protease-inhibition-independent induction of MMP-9 and promotion of tumor invasion [#27, #32, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Established the molecular identity and architecture of SLPI, defining it as a two-WAP-domain disulfide-rich protein and unifying inhibitory activities isolated from multiple secretions as products of a single gene.\",\n      \"evidence\": \"Direct protein and cDNA sequencing from cervical tissue, plus in vitro inhibition assays against chymase and other proteases\",\n      \"pmids\": [\"3485543\", \"3530282\", \"3060147\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which domain carries inhibitory activity\", \"No structural mechanism of inhibition\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Localized the protease-inhibitory function to the C-terminal WAP domain, showing the isolated domain inhibits neutrophil elastase and cathepsin G.\",\n      \"evidence\": \"In vitro enzymatic inhibition and platelet activation assays with recombinant full-length and truncated SLPI\",\n      \"pmids\": [\"8097952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of the N-terminal domain left undefined\", \"Less potent than full-length, mechanism of cooperativity unclear\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Mapped the SLPI gene structure and chromosomal location and identified the first transcriptional repressor (IRF-1), beginning the dissection of SLPI regulation.\",\n      \"evidence\": \"Genomic sequencing, FISH, RNA fingerprinting, EMSA, and promoter reporter assays\",\n      \"pmids\": [\"9843921\", \"10498899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repression mechanism and physiological context of IRF-1 control not established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated that SLPI antiprotease function is lost by oxidation, providing a mechanism for its inactivation in cigarette smoke exposure.\",\n      \"evidence\": \"In vivo mouse intratracheal recombinant SLPI with cigarette smoke and N-acetylcysteine rescue, BAL antitryptic activity\",\n      \"pmids\": [\"11435216\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific oxidized residues not identified in vivo\", \"Single lab\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic knockout established SLPI as an endogenous restraint on NF-\\u03baB-mediated inflammation in macrophages and B cells in vivo.\",\n      \"evidence\": \"SLPI-/- mice, LPS challenge, macrophage cytokine and NF-\\u03baB reporter assays, B cell proliferation\",\n      \"pmids\": [\"12615907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target by which SLPI inhibits NF-\\u03baB not defined\", \"Did not separate protease-dependent from independent effects\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Proved that SLPI's anti-inflammatory activity is independent of its antiprotease activity using active-site mutants and isolated domains.\",\n      \"evidence\": \"Site-directed mutagenesis (M73 variants) and domain truncations in stable RAW264.7 macrophages with LPS readouts\",\n      \"pmids\": [\"16112212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor/binding partner mediating immunomodulation not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined a TLR2-dependent, MyD88-independent induction pathway for SLPI, linking pathogen sensing to its expression.\",\n      \"evidence\": \"Macrophages from TLR2-/-, TLR4-/-, and MyD88-/- mice with M. tuberculosis stimulation\",\n      \"pmids\": [\"16236128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MyD88-independent transcriptional effectors downstream of TLR2 not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed SLPI acts as a homeostatic brake on adaptive immunity by inhibiting AID induction and immunoglobulin class switching in B cells.\",\n      \"evidence\": \"Human tonsillar explant and B cell-epithelial co-culture with AID and class-switch readouts and SLPI blocking\",\n      \"pmids\": [\"17259987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between SLPI and AID suppression unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified SLPI as a neutrophil secondary granule protein co-stored and co-released with lactoferrin, defining its cellular reservoir in innate immunity.\",\n      \"evidence\": \"Microarray of bone marrow populations, subcellular fractionation, immunostaining, exocytosis assay\",\n      \"pmids\": [\"18285402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking and sorting determinants to secondary granules not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed secreted SLPI is covalently cross-linked into the extracellular matrix by transglutaminases while retaining inhibitory activity, explaining its matrix association.\",\n      \"evidence\": \"In vitro transglutaminase cross-linking to fibronectin/elastin, mass spectrometry site mapping, activity assays\",\n      \"pmids\": [\"21687692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological significance of matrix-bound SLPI not tested in vivo\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that SLPI can promote tumor invasion through protease-inhibition-independent MMP-9 induction, revealing a context-dependent pro-tumorigenic role.\",\n      \"evidence\": \"Protease-inhibitor-null SLPI mutant in ovarian cancer cells, invasion, MMP-9, xenograft, and tissue microarray\",\n      \"pmids\": [\"21676452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional pathway from SLPI to MMP-9 not defined\", \"Receptor mediating the effect unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified TSLP-induced epithelial SLPI as required for mucosal healing, linking SLPI induction to control of neutrophil elastase damage in colitis.\",\n      \"evidence\": \"Tslp-/- mice, DSS colitis, bone marrow chimeras, NE inhibitor and rSLPI rescue\",\n      \"pmids\": [\"21820333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether protection is purely via NE inhibition versus immunomodulation not fully separated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed SLPI controls myeloid progenitor proliferation, differentiation, and survival through NF-\\u03baB and ERK/LEF-1 signaling, and revealed reciprocal NE-SLPI regulation.\",\n      \"evidence\": \"shRNA knockdown in CD34+ progenitors, wild-type/mutant NE transduction, flow cytometry and pathway Western blots\",\n      \"pmids\": [\"24352879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between SLPI and ERK/LEF-1 activation unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined STAT1 as a direct transcriptional activator of SLPI binding its promoter, integrating SLPI expression into interferon-responsive epithelial signaling.\",\n      \"evidence\": \"ChIP, promoter reporter assays, Stat1-/- mice, expression analysis in smokers\",\n      \"pmids\": [\"24285265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between STAT1 activation and IFN-\\u03b3-mediated suppression not reconciled\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated SLPI restrains NET formation by inhibiting nuclear histone H4 cleavage in co-localization with neutrophil elastase, defining a nuclear function in innate immunity.\",\n      \"evidence\": \"Human neutrophil NET assays, SLPI-/- neutrophils, H4 cleavage assay, nuclear immunofluorescence, psoriasis model\",\n      \"pmids\": [\"25917460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of SLPI nuclear entry not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the signaling pathway by which SLPI blocks inflammasome activation, implicating iPLA2\\u03b2, nicotinic acetylcholine receptors, and Src kinase upstream of caspase-1.\",\n      \"evidence\": \"Human monocytic cells with siRNA/inhibitors for iPLA2\\u03b2, nAChR subunits, caspase-1 assays, Xenopus oocyte electrophysiology\",\n      \"pmids\": [\"31019507\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the low-molecular-mass mediator released by SLPI not defined\", \"Direct SLPI receptor not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified Mecp2 as a direct promoter-binding repressor of SLPI controlling adipose browning, extending SLPI regulation to metabolic tissue.\",\n      \"evidence\": \"ChIP, fat-specific Mecp2 knockout, in vivo Slpi knockdown rescue, recombinant SLPI treatment\",\n      \"pmids\": [\"31597640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effector of SLPI in browning not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The cell-surface receptor(s) mediating SLPI's protease-independent immunomodulatory and signaling effects remain unidentified, leaving the mechanistic link between SLPI binding and intracellular NF-\\u03baB/ERK/MAPK outcomes unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined SLPI receptor across immune, hematopoietic, or tumor contexts\", \"How SLPI accesses intracellular/nuclear compartments is unknown\", \"Whether matrix-bound vs free SLPI signal differently is untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 4, 13, 15]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2, 21]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [7, 26]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [13, 19, 37, 40]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [13, 17, 33]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ELANE\", \"TUBB1\", \"ANXA2\", \"RB1\", \"FOXM1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}