{"gene":"DCN","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":2021,"finding":"DCN (decorin) is released from ferroptotic cells via secretory autophagy and lysosomal exocytosis, acting as a damage-associated molecular pattern (DAMP). Extracellular DCN binds to AGER (advanced glycosylation end-product-specific receptor) on macrophages and triggers pro-inflammatory cytokine production in an NFKB-dependent manner.","method":"Pharmacological and genetic inhibition of DCN-AGER axis in cell culture and in vivo models of acute pancreatitis; assessment of cytokine production and immune responses","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological inhibition with defined receptor binding and downstream signaling, single lab with multiple orthogonal approaches","pmids":["34964698"],"is_preprint":false},{"year":2012,"finding":"The deubiquitinase OTUB1 physically interacts with DCN (decorin) in mesangial cells (demonstrated by immunoprecipitation), and OTUB1 overexpression enhances ubiquitination and proteasomal degradation of DCN, thereby reducing DCN protein levels during glomerulonephritis.","method":"Immunoprecipitation co-IP; OTUB1 overexpression with assessment of DCN ubiquitination and protein degradation in rat mesangial cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP demonstrated OTUB1-DCN interaction; overexpression showed increased DCN ubiquitination/degradation; single lab with two orthogonal methods","pmids":["22279542"],"is_preprint":false},{"year":2014,"finding":"Methylation of the +58CpG site in the DCN 5'-UTR reduces the recruitment of the transcriptional activator AhR to the DCN promoter, reducing DCN transcriptional activity by ~50% and thereby enhancing TGF-β/Smad3 signaling (increased p-Smad3, decreased E-cadherin) in NSCLC cells with high metastatic potential.","method":"Clonal bisulfite sequencing, ChIP assay, EMSA, luciferase reporter gene assay, 5-Aza demethylating agent treatment with quantitative PCR and Western blot","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (EMSA, ChIP, luciferase, bisulfite sequencing) in single lab establishing epigenetic mechanism","pmids":["24424784"],"is_preprint":false},{"year":2015,"finding":"DCN overexpression in renal cell carcinoma cells inhibits proliferation and metastasis in vitro and in vivo, and mechanistically upregulates P21 (cell cycle inhibitor) and E-cadherin expression.","method":"Gain-of-function (ectopic DCN overexpression) in RCC cells with in vitro proliferation/metastasis assays and in vivo xenograft; Western blot for P21 and E-cadherin","journal":"Tumour biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, gain-of-function with phenotypic readout and protein expression changes, but no direct mechanistic dissection of how DCN upregulates P21/E-cadherin","pmids":["26547587"],"is_preprint":false},{"year":2024,"finding":"DCN knockdown in breast stromal fibroblasts activates the STAT3/AUF1 signaling pathway, upregulates CAF biomarkers (α-SMA, FAP-α, SDF-1, IL-6), and promotes pro-carcinogenic paracrine effects including epithelial-mesenchymal transition, stemness, angiogenesis, and tumor growth. Ectopic DCN expression in CAFs reverses these effects.","method":"DCN knockdown/overexpression in breast stromal fibroblasts; Western blot for signaling molecules; in vitro invasion/proliferation assays; in vivo orthotopic tumor growth; paracrine co-culture experiments","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD and OE, in vitro and in vivo, signaling pathway analysis), single lab","pmids":["38667295"],"is_preprint":false},{"year":2008,"finding":"DCN functions as a specific antagonist of EGFR (epidermal growth factor receptor), targeting tumor cells enriched in EGFR and causing significant downregulation of EGFR. A recombinant chimera SDF-1/54-DCN inhibited both proliferation (via EGFR blockade) and chemotaxis (via CXCR4 blockade) of tumor cells in vitro.","method":"Expression of recombinant chimera in E. coli, purification, and in vitro bioactivity assays on tumor cell proliferation and chemotaxis","journal":"Biological & pharmaceutical bulletin","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, in vitro assay with recombinant protein, no direct mechanistic dissection of DCN-EGFR binding separately from the chimera context","pmids":["18520035"],"is_preprint":false},{"year":2018,"finding":"Oncolytic adenovirus-mediated DCN expression in breast tumors downregulates decorin target genes, decreases epithelial-mesenchymal transition markers, and modulates Wnt/β-catenin, VEGF, and Met pathways; DCN expression in lung tissues increases Th1 cytokines (IL-2, IL-12, TNFα) and decreases Th2 cytokines (TGF-β, IL-6).","method":"In vivo orthotopic breast tumor model with intratumoral and intravenous delivery of rAd.DCN; gene expression analysis, cytokine measurement, CD8+ T cell quantification","journal":"Human gene therapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, in vivo model with multiple readouts, but signaling pathway placements are correlational rather than direct mechanistic dissection","pmids":["30032645"],"is_preprint":false},{"year":2024,"finding":"Progranulin (PGRN) suppresses H. pylori-induced autophagy by downregulating DCN expression through the mTOR pathway, thereby promoting intracellular colonization of H. pylori. Mechanistically, PGRN/mTOR signaling represses DCN, which would otherwise promote autophagy-mediated bacterial clearance.","method":"In vitro and in vivo H. pylori infection models; PGRN/DCN overexpression and knockdown; mTOR pathway inhibition; assessment of autophagy markers","journal":"Frontiers in cellular and infection microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation (OE/KD) of PGRN and DCN with pathway dissection using mTOR inhibition, single lab with multiple orthogonal methods","pmids":["39145305"],"is_preprint":false},{"year":2025,"finding":"EGR3 directly binds to the DCN promoter and acts as a transcriptional activator of DCN in liver cancer cells, as validated by ChIP assay and luciferase reporter assay. EGR3 knockdown reverses the tumor-suppressive effects of DCN (suppression of proliferation, invasion, migration; promotion of apoptosis).","method":"ChIP assay, luciferase reporter assay, EGR3 knockdown, DCN overexpression with rescue experiments (co-transfection), CCK-8, colony formation, flow cytometry, Transwell assays","journal":"Journal of biochemical and molecular toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and luciferase reporter directly demonstrate EGR3-DCN promoter interaction, supported by functional rescue experiments; single lab","pmids":["40660758"],"is_preprint":false},{"year":2025,"finding":"DCN overexpression alleviates H2O2-induced hepatocyte injury by upregulating HIF1A, promoting cell survival, reducing oxidative stress, and regulating autophagy and cell cycle. Pharmacological HIF1A inhibition (LW6) reversed the protective effects of DCN, placing DCN upstream of HIF1A in this pathway.","method":"DCN overexpression/knockdown plasmids in BRL cells; H2O2-induced injury model; HIF1A inhibitor (LW6) rescue experiment; assessment of cell viability, cycle, autophagy, and oxidative stress markers","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic placement of DCN upstream of HIF1A using pharmacological inhibition with OE/KD; multiple readouts; single lab","pmids":["41468793"],"is_preprint":false},{"year":2022,"finding":"Frameshift mutations in DCN (e.g., novel heterozygous p.His317Thrfs*11 deletion in exon 8) cause congenital stromal corneal dystrophy (CSCD), with histopathology showing irregular lamellar collagen spacing and fibril formation, and increased DCN immunostaining in widened interlamellar spaces, linking DCN to collagen fibril organization in the corneal stroma.","method":"Genetic sequencing of DCN, in silico pathogenicity prediction; light/electron microscopy and immunofluorescence of excised corneal tissue from affected individuals","journal":"Cornea","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genetic and histopathological linkage between DCN mutation and collagen fibril disorganization; replicated across multiple CSCD pedigrees in literature","pmids":["36534610"],"is_preprint":false},{"year":2025,"finding":"DCN promotes tendon stem cell (TSC) differentiation and collagen fibril organization during Achilles tendon healing. In vivo, DCN/heparin-loaded sutures enhanced collagen fibril organization and improved tensile strength, with mRNA and immunohistochemical confirmation of collagen remodeling markers.","method":"In vitro TSC proliferation/differentiation assays with DCN; electrospun Hep/DCN-loaded sutures; in vivo Achilles tendon repair model; mRNA analysis and immunohistochemistry","journal":"Journal of biomedical materials research. Part A","confidence":"Low","confidence_rationale":"Tier 3 / Weak — in vitro and in vivo functional assay with DCN, single lab, no direct mechanistic dissection of DCN's molecular target in tendon","pmids":["41313163"],"is_preprint":false},{"year":2024,"finding":"DCN promotes cardiac organoid maturation by activating AMPK signaling, which in turn regulates mitochondrial biogenesis, fatty acid oxidation, mitophagy, and ion channel expression. AMPK knockdown in DCN-treated cardiac organoids impaired these maturation effects, placing AMPK downstream of DCN.","method":"DCN treatment of cardiac organoids; AMPK knockdown; transcriptional profiling; functional assays (sarcomere alignment, Ca2+ transient, contraction, mitophagy, fatty acid oxidation)","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, epistatic placement of AMPK downstream of DCN by knockdown, but no direct DCN-AMPK binding or upstream receptor identified","pmids":[],"is_preprint":true},{"year":2025,"finding":"DCN suppresses VF myofibroblast activation by reducing pro-fibrotic gene expression, α-SMA levels, and cell contractility. DCN is downregulated during fibrotic wound healing in a rat model of vocal fold scarring, and DCN-loaded microgels prevented collagen deposition and myofibroblast activation in vivo.","method":"Transcriptomics of human VF myofibroblasts; DCN protein administration in vitro; DCN-loaded hyaluronic acid microgels in rat VF scarring model; histological assessment of collagen and α-SMA","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, functional suppression of myofibroblast activation by DCN shown in vitro and in vivo, but molecular receptor/pathway not fully dissected","pmids":[],"is_preprint":true}],"current_model":"Decorin (DCN) is a secreted small leucine-rich proteoglycan that functions as an extracellular matrix component and signaling molecule: it is released from dying cells (including during ferroptosis) via autophagy/lysosomal exocytosis to engage AGER on macrophages and trigger NF-κB-dependent inflammation; it antagonizes TGF-β/Smad signaling (inhibiting fibrosis and cancer metastasis); it interacts with EGFR to suppress tumor cell proliferation; its expression is epigenetically silenced by +58CpG methylation (reducing AhR-driven transcription) and post-translationally regulated by OTUB1-mediated ubiquitination and degradation; transcription is activated by EGR3 binding to its promoter; and loss-of-function DCN frameshift mutations cause congenital stromal corneal dystrophy by disrupting collagen fibril organization."},"narrative":{"mechanistic_narrative":"Decorin (DCN) is a secreted extracellular matrix proteoglycan that governs collagen fibril organization and acts as a multifunctional signaling modulator restraining fibrosis and tumor progression [PMID:36534610]. Frameshift mutations in DCN cause congenital stromal corneal dystrophy, where loss of normal protein disrupts lamellar collagen spacing and fibril formation in the corneal stroma, establishing its structural role in matrix assembly [PMID:36534610]; DCN similarly promotes ordered collagen fibril organization during tendon healing [PMID:41313163]. As a signaling molecule, DCN functions as an antagonist of EGFR and downregulates receptor levels in tumor cells [PMID:18520035], and its restoration in carcinoma cells and stromal fibroblasts suppresses proliferation, invasion, and metastasis while inducing P21 and E-cadherin and reversing cancer-associated fibroblast activation through STAT3/AUF1 signaling [PMID:26547587, PMID:38667295]. DCN suppresses myofibroblast activation and pro-fibrotic gene expression, consistent with an anti-fibrotic function. In injured and stressed tissues DCN engages cytoprotective and immune programs: it is released from ferroptotic cells via secretory autophagy and lysosomal exocytosis and binds the macrophage receptor AGER to trigger NF-kB-dependent pro-inflammatory cytokine production as a damage-associated molecular pattern [PMID:34964698], and it promotes autophagy-mediated clearance of intracellular H. pylori [PMID:39145305]. DCN expression is controlled at multiple levels: transcriptionally activated by EGR3 binding to its promoter [PMID:40660758] and by AhR recruitment that is blocked by +58CpG methylation [PMID:24424784], and post-translationally destabilized by OTUB1-mediated ubiquitination and proteasomal degradation [PMID:22279542].","teleology":[{"year":2008,"claim":"Established that DCN can act as an EGFR antagonist, providing a molecular basis for its tumor-suppressive effect on proliferation.","evidence":"Recombinant SDF-1/54-DCN chimera in vitro assays on tumor cell proliferation and chemotaxis","pmids":["18520035"],"confidence":"Low","gaps":["No direct mechanistic dissection of DCN-EGFR binding separate from the chimera context","EGFR downregulation mechanism (degradation vs. internalization) not resolved","No in vivo validation of the DCN-EGFR axis"]},{"year":2012,"claim":"Identified a post-translational control point showing DCN protein levels are limited by OTUB1-driven ubiquitination and degradation.","evidence":"Co-IP and OTUB1 overexpression with DCN ubiquitination/degradation assays in rat mesangial cells","pmids":["22279542"],"confidence":"Medium","gaps":["Reciprocal/endogenous validation of the OTUB1-DCN interaction not shown","DCN ubiquitination sites and E3 ligase not identified","Physiological consequences in glomerulonephritis only correlative"]},{"year":2014,"claim":"Defined an epigenetic mechanism whereby +58CpG methylation reduces AhR-driven DCN transcription, linking DCN loss to enhanced TGF-beta/Smad3 signaling and metastasis.","evidence":"Bisulfite sequencing, ChIP, EMSA, luciferase reporter, and 5-Aza treatment in NSCLC cells","pmids":["24424784"],"confidence":"Medium","gaps":["Direct demonstration that DCN protein restoration reverses Smad3 activation not shown here","Whether AhR is the sole methylation-sensitive activator is unresolved"]},{"year":2015,"claim":"Showed DCN restoration suppresses carcinoma proliferation and metastasis with concomitant P21 and E-cadherin upregulation, framing DCN as a tumor suppressor.","evidence":"Ectopic DCN overexpression in RCC cells with in vitro assays and xenografts; Western blot","pmids":["26547587"],"confidence":"Low","gaps":["No mechanistic link between DCN and P21/E-cadherin induction","Receptor mediating these effects not identified"]},{"year":2018,"claim":"Demonstrated that DCN delivery shifts tumor signaling and immune polarization, modulating EMT, Wnt/beta-catenin, VEGF, Met, and Th1/Th2 cytokine balance.","evidence":"Oncolytic adenovirus rAd.DCN in an orthotopic breast tumor model with gene expression and cytokine analysis","pmids":["30032645"],"confidence":"Low","gaps":["Pathway placements are correlational, not direct mechanistic dissection","Direct DCN target receptor for each pathway unidentified"]},{"year":2021,"claim":"Established DCN as a ferroptosis-derived DAMP that signals through the macrophage receptor AGER to drive NF-kB-dependent inflammation, defining a release-and-signal axis.","evidence":"Genetic and pharmacological inhibition of the DCN-AGER axis in cell culture and acute pancreatitis models","pmids":["34964698"],"confidence":"Medium","gaps":["Structural basis of DCN-AGER binding not defined","Relative contribution of secretory autophagy vs. lysosomal exocytosis to release unresolved"]},{"year":2022,"claim":"Provided direct human-genetics evidence that DCN loss-of-function causes congenital stromal corneal dystrophy via disrupted collagen fibril organization, cementing its structural ECM role.","evidence":"DCN sequencing plus light/electron microscopy and immunofluorescence of affected corneal tissue","pmids":["36534610"],"confidence":"Medium","gaps":["Molecular mechanism by which the frameshift product perturbs fibril spacing not dissected","Whether the mutant acts dominant-negatively or via haploinsufficiency unresolved"]},{"year":2024,"claim":"Showed DCN loss in stromal fibroblasts drives a cancer-associated fibroblast phenotype via STAT3/AUF1, identifying a paracrine pro-tumor mechanism reversible by DCN restoration.","evidence":"DCN knockdown/overexpression in breast stromal fibroblasts with signaling, co-culture, and orthotopic tumor assays","pmids":["38667295"],"confidence":"Medium","gaps":["Direct link between DCN and STAT3/AUF1 (receptor/upstream node) not defined","Whether secreted DCN acts cell-autonomously or via matrix not separated"]},{"year":2024,"claim":"Placed DCN within host defense by showing PGRN/mTOR signaling represses DCN to suppress autophagy and permit H. pylori colonization.","evidence":"H. pylori infection models with PGRN/DCN overexpression and knockdown plus mTOR inhibition","pmids":["39145305"],"confidence":"Medium","gaps":["Mechanism by which DCN promotes autophagy not defined","Direct PGRN-DCN regulatory step versus indirect mTOR effect not separated"]},{"year":2025,"claim":"Identified EGR3 as a direct transcriptional activator of DCN, linking an upstream transcription factor to DCN's tumor-suppressive program in liver cancer.","evidence":"ChIP and luciferase reporter assays with EGR3 knockdown and DCN rescue in liver cancer cells","pmids":["40660758"],"confidence":"Medium","gaps":["Whether EGR3 regulation of DCN operates in non-hepatic contexts unknown","Upstream signals controlling EGR3 here not defined"]},{"year":2025,"claim":"Showed DCN confers cytoprotection against oxidative injury by acting upstream of HIF1A to support survival and regulate autophagy.","evidence":"DCN overexpression/knockdown in H2O2-injured hepatocytes with HIF1A inhibitor (LW6) rescue","pmids":["41468793"],"confidence":"Medium","gaps":["Mechanism connecting DCN to HIF1A stabilization not defined","Receptor mediating the cytoprotective signal unidentified"]},{"year":2025,"claim":"Extended DCN's structural role to tendon repair, demonstrating it promotes stem cell differentiation and ordered collagen fibril formation.","evidence":"In vitro TSC assays and in vivo Achilles tendon repair with DCN/heparin-loaded sutures","pmids":["41313163"],"confidence":"Low","gaps":["Molecular target of DCN in tendon not identified","Contribution of heparin co-delivery versus DCN alone not separated"]},{"year":null,"claim":"The cell-surface receptor(s) and signaling logic that unify DCN's anti-fibrotic, anti-tumor, cytoprotective, and immune-activating functions across tissues remain undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No single mechanistic model reconciling EGFR antagonism, AGER signaling, and HIF1A/AMPK cytoprotection","Structural basis of DCN-receptor interactions not resolved in this corpus","Quantitative relationship between matrix-bound and soluble DCN pools unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,0]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[10,11]}],"localization":[{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[10,11]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[10,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,0,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,7]}],"complexes":[],"partners":["AGER","EGFR","OTUB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P07585","full_name":"Decorin","aliases":["Bone proteoglycan II","PG-S2","PG40"],"length_aa":359,"mass_kda":39.7,"function":"May affect the rate of fibrils formation","subcellular_location":"Secreted, extracellular space, extracellular matrix; Secreted","url":"https://www.uniprot.org/uniprotkb/P07585/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DCN","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DCN","total_profiled":1310},"omim":[{"mim_id":"619710","title":"HYALURONAN AND PROTEOGLYCAN LINK PROTEIN 4; HAPLN4","url":"https://www.omim.org/entry/619710"},{"mim_id":"612977","title":"DCN1 DOMAIN-CONTAINING PROTEIN 4; DCUN1D4","url":"https://www.omim.org/entry/612977"},{"mim_id":"612868","title":"CORNEAL DYSTROPHY, POSTERIOR AMORPHOUS; PACD","url":"https://www.omim.org/entry/612868"},{"mim_id":"612654","title":"TRICHOPLEIN; TCHP","url":"https://www.omim.org/entry/612654"},{"mim_id":"610048","title":"CORNEAL DYSTROPHY, CONGENITAL STROMAL; CSCD","url":"https://www.omim.org/entry/610048"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DCN"},"hgnc":{"alias_symbol":["DSPG2","SLRR1B"],"prev_symbol":[]},"alphafold":{"accession":"P07585","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07585","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07585-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07585-F1-predicted_aligned_error_v6.png","plddt_mean":88.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DCN","jax_strain_url":"https://www.jax.org/strain/search?query=DCN"},"sequence":{"accession":"P07585","fasta_url":"https://rest.uniprot.org/uniprotkb/P07585.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07585/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07585"}},"corpus_meta":[{"pmid":"15988528","id":"PMC_15988528","title":"The conserved protein DCN-1/Dcn1p is required for cullin neddylation in C. elegans and S. cerevisiae.","date":"2005","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/15988528","citation_count":157,"is_preprint":false},{"pmid":"11820791","id":"PMC_11820791","title":"Asb4, Ata3, and Dcn are novel imprinted genes identified by high-throughput screening using RIKEN cDNA microarray.","date":"2002","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11820791","citation_count":116,"is_preprint":false},{"pmid":"34964698","id":"PMC_34964698","title":"DCN released from ferroptotic cells ignites AGER-dependent immune responses.","date":"2021","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/34964698","citation_count":109,"is_preprint":false},{"pmid":"1968422","id":"PMC_1968422","title":"Localization of PGI (biglycan, BGN) and PGII (decorin, DCN, PG-40) genes on human chromosomes Xq13-qter and 12q, respectively.","date":"1990","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/1968422","citation_count":60,"is_preprint":false},{"pmid":"2914952","id":"PMC_2914952","title":"Recognition of (dG)n.(dC)n sequences by endonuclease G. Characterization of the calf thymus nuclease.","date":"1989","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/2914952","citation_count":53,"is_preprint":false},{"pmid":"30604627","id":"PMC_30604627","title":"Identification of CAV1 and DCN as potential predictive biomarkers for lung adenocarcinoma.","date":"2019","source":"American journal of physiology. Lung cellular and molecular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/30604627","citation_count":50,"is_preprint":false},{"pmid":"33767918","id":"PMC_33767918","title":"lncRNA FDNCR promotes apoptosis of granulosa cells by targeting the miR-543-3p/DCN/TGF-β signaling pathway in Hu sheep.","date":"2021","source":"Molecular therapy. Nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/33767918","citation_count":46,"is_preprint":false},{"pmid":"1611907","id":"PMC_1611907","title":"Expression of decorin in human tissues and cell lines and defined chromosomal assignment of the gene locus (DCN).","date":"1992","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/1611907","citation_count":42,"is_preprint":false},{"pmid":"26906416","id":"PMC_26906416","title":"Characterization of the mammalian family of DCN-type NEDD8 E3 ligases.","date":"2016","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/26906416","citation_count":41,"is_preprint":false},{"pmid":"17597076","id":"PMC_17597076","title":"Structural basis for the function of DCN-1 in protein Neddylation.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17597076","citation_count":41,"is_preprint":false},{"pmid":"19678923","id":"PMC_19678923","title":"Presence of activating KRAS mutations correlates significantly with expression of tumour suppressor genes DCN and TPM1 in colorectal cancer.","date":"2009","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/19678923","citation_count":36,"is_preprint":false},{"pmid":"3271474","id":"PMC_3271474","title":"Structure of (dG)n.(dC)n under superhelical stress and acid pH.","date":"1987","source":"Journal of biomolecular structure & dynamics","url":"https://pubmed.ncbi.nlm.nih.gov/3271474","citation_count":36,"is_preprint":false},{"pmid":"26547587","id":"PMC_26547587","title":"DCN deficiency promotes renal cell carcinoma growth and metastasis through downregulation of P21 and E-cadherin.","date":"2015","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26547587","citation_count":29,"is_preprint":false},{"pmid":"28261350","id":"PMC_28261350","title":"Identifying DCN and HSPD1 as Potential Biomarkers in Colon Cancer Using 2D-LC-MS/MS Combined with iTRAQ Technology.","date":"2017","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/28261350","citation_count":27,"is_preprint":false},{"pmid":"30032645","id":"PMC_30032645","title":"Oncolytic Adenovirus rAd.DCN Inhibits Breast Tumor Growth and Lung Metastasis in an Immune-Competent Orthotopic Xenograft Model.","date":"2018","source":"Human gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/30032645","citation_count":24,"is_preprint":false},{"pmid":"3368317","id":"PMC_3368317","title":"Deoxycytidine methylation does not affect DNA.RNA hybrid formation or B-A transitions of (dG)n.(dC)n sequences.","date":"1988","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/3368317","citation_count":24,"is_preprint":false},{"pmid":"2587262","id":"PMC_2587262","title":"Energetics of the B-H transition in supercoiled DNA carrying d(CT)x.d(AG)x and d(C)n.d(G)n inserts.","date":"1989","source":"Nucleic 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Extracellular DCN binds to AGER (advanced glycosylation end-product-specific receptor) on macrophages and triggers pro-inflammatory cytokine production in an NFKB-dependent manner.\",\n      \"method\": \"Pharmacological and genetic inhibition of DCN-AGER axis in cell culture and in vivo models of acute pancreatitis; assessment of cytokine production and immune responses\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological inhibition with defined receptor binding and downstream signaling, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"34964698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The deubiquitinase OTUB1 physically interacts with DCN (decorin) in mesangial cells (demonstrated by immunoprecipitation), and OTUB1 overexpression enhances ubiquitination and proteasomal degradation of DCN, thereby reducing DCN protein levels during glomerulonephritis.\",\n      \"method\": \"Immunoprecipitation co-IP; OTUB1 overexpression with assessment of DCN ubiquitination and protein degradation in rat mesangial cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP demonstrated OTUB1-DCN interaction; overexpression showed increased DCN ubiquitination/degradation; single lab with two orthogonal methods\",\n      \"pmids\": [\"22279542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Methylation of the +58CpG site in the DCN 5'-UTR reduces the recruitment of the transcriptional activator AhR to the DCN promoter, reducing DCN transcriptional activity by ~50% and thereby enhancing TGF-β/Smad3 signaling (increased p-Smad3, decreased E-cadherin) in NSCLC cells with high metastatic potential.\",\n      \"method\": \"Clonal bisulfite sequencing, ChIP assay, EMSA, luciferase reporter gene assay, 5-Aza demethylating agent treatment with quantitative PCR and Western blot\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (EMSA, ChIP, luciferase, bisulfite sequencing) in single lab establishing epigenetic mechanism\",\n      \"pmids\": [\"24424784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DCN overexpression in renal cell carcinoma cells inhibits proliferation and metastasis in vitro and in vivo, and mechanistically upregulates P21 (cell cycle inhibitor) and E-cadherin expression.\",\n      \"method\": \"Gain-of-function (ectopic DCN overexpression) in RCC cells with in vitro proliferation/metastasis assays and in vivo xenograft; Western blot for P21 and E-cadherin\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, gain-of-function with phenotypic readout and protein expression changes, but no direct mechanistic dissection of how DCN upregulates P21/E-cadherin\",\n      \"pmids\": [\"26547587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DCN knockdown in breast stromal fibroblasts activates the STAT3/AUF1 signaling pathway, upregulates CAF biomarkers (α-SMA, FAP-α, SDF-1, IL-6), and promotes pro-carcinogenic paracrine effects including epithelial-mesenchymal transition, stemness, angiogenesis, and tumor growth. Ectopic DCN expression in CAFs reverses these effects.\",\n      \"method\": \"DCN knockdown/overexpression in breast stromal fibroblasts; Western blot for signaling molecules; in vitro invasion/proliferation assays; in vivo orthotopic tumor growth; paracrine co-culture experiments\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD and OE, in vitro and in vivo, signaling pathway analysis), single lab\",\n      \"pmids\": [\"38667295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DCN functions as a specific antagonist of EGFR (epidermal growth factor receptor), targeting tumor cells enriched in EGFR and causing significant downregulation of EGFR. A recombinant chimera SDF-1/54-DCN inhibited both proliferation (via EGFR blockade) and chemotaxis (via CXCR4 blockade) of tumor cells in vitro.\",\n      \"method\": \"Expression of recombinant chimera in E. coli, purification, and in vitro bioactivity assays on tumor cell proliferation and chemotaxis\",\n      \"journal\": \"Biological & pharmaceutical bulletin\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, in vitro assay with recombinant protein, no direct mechanistic dissection of DCN-EGFR binding separately from the chimera context\",\n      \"pmids\": [\"18520035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Oncolytic adenovirus-mediated DCN expression in breast tumors downregulates decorin target genes, decreases epithelial-mesenchymal transition markers, and modulates Wnt/β-catenin, VEGF, and Met pathways; DCN expression in lung tissues increases Th1 cytokines (IL-2, IL-12, TNFα) and decreases Th2 cytokines (TGF-β, IL-6).\",\n      \"method\": \"In vivo orthotopic breast tumor model with intratumoral and intravenous delivery of rAd.DCN; gene expression analysis, cytokine measurement, CD8+ T cell quantification\",\n      \"journal\": \"Human gene therapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, in vivo model with multiple readouts, but signaling pathway placements are correlational rather than direct mechanistic dissection\",\n      \"pmids\": [\"30032645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Progranulin (PGRN) suppresses H. pylori-induced autophagy by downregulating DCN expression through the mTOR pathway, thereby promoting intracellular colonization of H. pylori. Mechanistically, PGRN/mTOR signaling represses DCN, which would otherwise promote autophagy-mediated bacterial clearance.\",\n      \"method\": \"In vitro and in vivo H. pylori infection models; PGRN/DCN overexpression and knockdown; mTOR pathway inhibition; assessment of autophagy markers\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation (OE/KD) of PGRN and DCN with pathway dissection using mTOR inhibition, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"39145305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"EGR3 directly binds to the DCN promoter and acts as a transcriptional activator of DCN in liver cancer cells, as validated by ChIP assay and luciferase reporter assay. EGR3 knockdown reverses the tumor-suppressive effects of DCN (suppression of proliferation, invasion, migration; promotion of apoptosis).\",\n      \"method\": \"ChIP assay, luciferase reporter assay, EGR3 knockdown, DCN overexpression with rescue experiments (co-transfection), CCK-8, colony formation, flow cytometry, Transwell assays\",\n      \"journal\": \"Journal of biochemical and molecular toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and luciferase reporter directly demonstrate EGR3-DCN promoter interaction, supported by functional rescue experiments; single lab\",\n      \"pmids\": [\"40660758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DCN overexpression alleviates H2O2-induced hepatocyte injury by upregulating HIF1A, promoting cell survival, reducing oxidative stress, and regulating autophagy and cell cycle. Pharmacological HIF1A inhibition (LW6) reversed the protective effects of DCN, placing DCN upstream of HIF1A in this pathway.\",\n      \"method\": \"DCN overexpression/knockdown plasmids in BRL cells; H2O2-induced injury model; HIF1A inhibitor (LW6) rescue experiment; assessment of cell viability, cycle, autophagy, and oxidative stress markers\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic placement of DCN upstream of HIF1A using pharmacological inhibition with OE/KD; multiple readouts; single lab\",\n      \"pmids\": [\"41468793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Frameshift mutations in DCN (e.g., novel heterozygous p.His317Thrfs*11 deletion in exon 8) cause congenital stromal corneal dystrophy (CSCD), with histopathology showing irregular lamellar collagen spacing and fibril formation, and increased DCN immunostaining in widened interlamellar spaces, linking DCN to collagen fibril organization in the corneal stroma.\",\n      \"method\": \"Genetic sequencing of DCN, in silico pathogenicity prediction; light/electron microscopy and immunofluorescence of excised corneal tissue from affected individuals\",\n      \"journal\": \"Cornea\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genetic and histopathological linkage between DCN mutation and collagen fibril disorganization; replicated across multiple CSCD pedigrees in literature\",\n      \"pmids\": [\"36534610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DCN promotes tendon stem cell (TSC) differentiation and collagen fibril organization during Achilles tendon healing. In vivo, DCN/heparin-loaded sutures enhanced collagen fibril organization and improved tensile strength, with mRNA and immunohistochemical confirmation of collagen remodeling markers.\",\n      \"method\": \"In vitro TSC proliferation/differentiation assays with DCN; electrospun Hep/DCN-loaded sutures; in vivo Achilles tendon repair model; mRNA analysis and immunohistochemistry\",\n      \"journal\": \"Journal of biomedical materials research. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — in vitro and in vivo functional assay with DCN, single lab, no direct mechanistic dissection of DCN's molecular target in tendon\",\n      \"pmids\": [\"41313163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DCN promotes cardiac organoid maturation by activating AMPK signaling, which in turn regulates mitochondrial biogenesis, fatty acid oxidation, mitophagy, and ion channel expression. AMPK knockdown in DCN-treated cardiac organoids impaired these maturation effects, placing AMPK downstream of DCN.\",\n      \"method\": \"DCN treatment of cardiac organoids; AMPK knockdown; transcriptional profiling; functional assays (sarcomere alignment, Ca2+ transient, contraction, mitophagy, fatty acid oxidation)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, epistatic placement of AMPK downstream of DCN by knockdown, but no direct DCN-AMPK binding or upstream receptor identified\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DCN suppresses VF myofibroblast activation by reducing pro-fibrotic gene expression, α-SMA levels, and cell contractility. DCN is downregulated during fibrotic wound healing in a rat model of vocal fold scarring, and DCN-loaded microgels prevented collagen deposition and myofibroblast activation in vivo.\",\n      \"method\": \"Transcriptomics of human VF myofibroblasts; DCN protein administration in vitro; DCN-loaded hyaluronic acid microgels in rat VF scarring model; histological assessment of collagen and α-SMA\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, functional suppression of myofibroblast activation by DCN shown in vitro and in vivo, but molecular receptor/pathway not fully dissected\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"Decorin (DCN) is a secreted small leucine-rich proteoglycan that functions as an extracellular matrix component and signaling molecule: it is released from dying cells (including during ferroptosis) via autophagy/lysosomal exocytosis to engage AGER on macrophages and trigger NF-κB-dependent inflammation; it antagonizes TGF-β/Smad signaling (inhibiting fibrosis and cancer metastasis); it interacts with EGFR to suppress tumor cell proliferation; its expression is epigenetically silenced by +58CpG methylation (reducing AhR-driven transcription) and post-translationally regulated by OTUB1-mediated ubiquitination and degradation; transcription is activated by EGR3 binding to its promoter; and loss-of-function DCN frameshift mutations cause congenital stromal corneal dystrophy by disrupting collagen fibril organization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Decorin (DCN) is a secreted extracellular matrix proteoglycan that governs collagen fibril organization and acts as a multifunctional signaling modulator restraining fibrosis and tumor progression [#10, #13]. Frameshift mutations in DCN cause congenital stromal corneal dystrophy, where loss of normal protein disrupts lamellar collagen spacing and fibril formation in the corneal stroma, establishing its structural role in matrix assembly [#10]; DCN similarly promotes ordered collagen fibril organization during tendon healing [#11]. As a signaling molecule, DCN functions as an antagonist of EGFR and downregulates receptor levels in tumor cells [#5], and its restoration in carcinoma cells and stromal fibroblasts suppresses proliferation, invasion, and metastasis while inducing P21 and E-cadherin and reversing cancer-associated fibroblast activation through STAT3/AUF1 signaling [#3, #4]. DCN suppresses myofibroblast activation and pro-fibrotic gene expression, consistent with an anti-fibrotic function [#13]. In injured and stressed tissues DCN engages cytoprotective and immune programs: it is released from ferroptotic cells via secretory autophagy and lysosomal exocytosis and binds the macrophage receptor AGER to trigger NF-kB-dependent pro-inflammatory cytokine production as a damage-associated molecular pattern [#0], and it promotes autophagy-mediated clearance of intracellular H. pylori [#7]. DCN expression is controlled at multiple levels: transcriptionally activated by EGR3 binding to its promoter [#8] and by AhR recruitment that is blocked by +58CpG methylation [#2], and post-translationally destabilized by OTUB1-mediated ubiquitination and proteasomal degradation [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that DCN can act as an EGFR antagonist, providing a molecular basis for its tumor-suppressive effect on proliferation.\",\n      \"evidence\": \"Recombinant SDF-1/54-DCN chimera in vitro assays on tumor cell proliferation and chemotaxis\",\n      \"pmids\": [\"18520035\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct mechanistic dissection of DCN-EGFR binding separate from the chimera context\",\n        \"EGFR downregulation mechanism (degradation vs. internalization) not resolved\",\n        \"No in vivo validation of the DCN-EGFR axis\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified a post-translational control point showing DCN protein levels are limited by OTUB1-driven ubiquitination and degradation.\",\n      \"evidence\": \"Co-IP and OTUB1 overexpression with DCN ubiquitination/degradation assays in rat mesangial cells\",\n      \"pmids\": [\"22279542\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Reciprocal/endogenous validation of the OTUB1-DCN interaction not shown\",\n        \"DCN ubiquitination sites and E3 ligase not identified\",\n        \"Physiological consequences in glomerulonephritis only correlative\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined an epigenetic mechanism whereby +58CpG methylation reduces AhR-driven DCN transcription, linking DCN loss to enhanced TGF-beta/Smad3 signaling and metastasis.\",\n      \"evidence\": \"Bisulfite sequencing, ChIP, EMSA, luciferase reporter, and 5-Aza treatment in NSCLC cells\",\n      \"pmids\": [\"24424784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct demonstration that DCN protein restoration reverses Smad3 activation not shown here\",\n        \"Whether AhR is the sole methylation-sensitive activator is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed DCN restoration suppresses carcinoma proliferation and metastasis with concomitant P21 and E-cadherin upregulation, framing DCN as a tumor suppressor.\",\n      \"evidence\": \"Ectopic DCN overexpression in RCC cells with in vitro assays and xenografts; Western blot\",\n      \"pmids\": [\"26547587\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No mechanistic link between DCN and P21/E-cadherin induction\",\n        \"Receptor mediating these effects not identified\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that DCN delivery shifts tumor signaling and immune polarization, modulating EMT, Wnt/beta-catenin, VEGF, Met, and Th1/Th2 cytokine balance.\",\n      \"evidence\": \"Oncolytic adenovirus rAd.DCN in an orthotopic breast tumor model with gene expression and cytokine analysis\",\n      \"pmids\": [\"30032645\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Pathway placements are correlational, not direct mechanistic dissection\",\n        \"Direct DCN target receptor for each pathway unidentified\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established DCN as a ferroptosis-derived DAMP that signals through the macrophage receptor AGER to drive NF-kB-dependent inflammation, defining a release-and-signal axis.\",\n      \"evidence\": \"Genetic and pharmacological inhibition of the DCN-AGER axis in cell culture and acute pancreatitis models\",\n      \"pmids\": [\"34964698\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Structural basis of DCN-AGER binding not defined\",\n        \"Relative contribution of secretory autophagy vs. lysosomal exocytosis to release unresolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided direct human-genetics evidence that DCN loss-of-function causes congenital stromal corneal dystrophy via disrupted collagen fibril organization, cementing its structural ECM role.\",\n      \"evidence\": \"DCN sequencing plus light/electron microscopy and immunofluorescence of affected corneal tissue\",\n      \"pmids\": [\"36534610\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Molecular mechanism by which the frameshift product perturbs fibril spacing not dissected\",\n        \"Whether the mutant acts dominant-negatively or via haploinsufficiency unresolved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed DCN loss in stromal fibroblasts drives a cancer-associated fibroblast phenotype via STAT3/AUF1, identifying a paracrine pro-tumor mechanism reversible by DCN restoration.\",\n      \"evidence\": \"DCN knockdown/overexpression in breast stromal fibroblasts with signaling, co-culture, and orthotopic tumor assays\",\n      \"pmids\": [\"38667295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct link between DCN and STAT3/AUF1 (receptor/upstream node) not defined\",\n        \"Whether secreted DCN acts cell-autonomously or via matrix not separated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed DCN within host defense by showing PGRN/mTOR signaling represses DCN to suppress autophagy and permit H. pylori colonization.\",\n      \"evidence\": \"H. pylori infection models with PGRN/DCN overexpression and knockdown plus mTOR inhibition\",\n      \"pmids\": [\"39145305\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which DCN promotes autophagy not defined\",\n        \"Direct PGRN-DCN regulatory step versus indirect mTOR effect not separated\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified EGR3 as a direct transcriptional activator of DCN, linking an upstream transcription factor to DCN's tumor-suppressive program in liver cancer.\",\n      \"evidence\": \"ChIP and luciferase reporter assays with EGR3 knockdown and DCN rescue in liver cancer cells\",\n      \"pmids\": [\"40660758\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether EGR3 regulation of DCN operates in non-hepatic contexts unknown\",\n        \"Upstream signals controlling EGR3 here not defined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed DCN confers cytoprotection against oxidative injury by acting upstream of HIF1A to support survival and regulate autophagy.\",\n      \"evidence\": \"DCN overexpression/knockdown in H2O2-injured hepatocytes with HIF1A inhibitor (LW6) rescue\",\n      \"pmids\": [\"41468793\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism connecting DCN to HIF1A stabilization not defined\",\n        \"Receptor mediating the cytoprotective signal unidentified\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended DCN's structural role to tendon repair, demonstrating it promotes stem cell differentiation and ordered collagen fibril formation.\",\n      \"evidence\": \"In vitro TSC assays and in vivo Achilles tendon repair with DCN/heparin-loaded sutures\",\n      \"pmids\": [\"41313163\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Molecular target of DCN in tendon not identified\",\n        \"Contribution of heparin co-delivery versus DCN alone not separated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The cell-surface receptor(s) and signaling logic that unify DCN's anti-fibrotic, anti-tumor, cytoprotective, and immune-activating functions across tissues remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No single mechanistic model reconciling EGFR antagonism, AGER signaling, and HIF1A/AMPK cytoprotection\",\n        \"Structural basis of DCN-receptor interactions not resolved in this corpus\",\n        \"Quantitative relationship between matrix-bound and soluble DCN pools unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 0]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 0, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"AGER\",\n      \"EGFR\",\n      \"OTUB1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":5,"faith_total":5,"faith_pct":100.0}}