{"gene":"DKK3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2005,"finding":"Adenovirus-mediated overexpression of REIC/Dkk-3 in human prostate cancer cells induces apoptosis through activation of c-Jun-NH2-kinase (JNK), mitochondrial translocation of Bax, and reduction of Bcl-2, selectively in cancer cells lacking endogenous REIC/Dkk-3 but not in normal prostate epithelial/stromal cells.","method":"Adenoviral overexpression, apoptosis assays, JNK activation assays, xenograft mouse model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (overexpression, pathway readouts, in vivo xenograft), independently replicated across multiple cancer types in subsequent work","pmids":["16266978"],"is_preprint":false},{"year":2000,"finding":"REIC/Dkk-3 encodes a 350 amino acid secreted protein with coiled-coil structures at N- and C-termini; it is a member of the Dickkopf family and its expression is down-regulated in immortalized and tumor-derived human cell lines compared to normal counterparts.","method":"cDNA cloning, sequence analysis, protein database search, expression profiling by Northern blot","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — original cloning paper, sequence/structural characterization, expression confirmed in multiple cell lines","pmids":["10652205"],"is_preprint":false},{"year":2004,"finding":"DKK3/REIC protein exists as two isoforms: a 55 kDa cytosolic form and a 50 kDa secreted form; it is N-glycosylated. Ectopic expression suppresses cell growth and induces apoptosis, and reduces tumor growth in nude mice.","method":"Western blot, glycosylation analysis, ectopic expression, colony formation, xenograft","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods (biochemical characterization, in vitro, in vivo)","pmids":["15516983"],"is_preprint":false},{"year":2007,"finding":"Downregulation of Dkk3 activates the Wnt/β-catenin pathway in lung cancer: ectopic Dkk3 expression inhibits TCF-4 activity, prevents nuclear accumulation of β-catenin, and reduces expression of TCF-4 targets c-Myc and cyclin D1; siRNA knockdown of Dkk3 is sufficient to promote β-catenin nuclear translocation and c-Myc expression.","method":"Ectopic expression, siRNA knockdown, TCF/LEF reporter assay, Western blot, nuclear fractionation","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with defined pathway readouts, multiple orthogonal methods in one study","pmids":["18048388"],"is_preprint":false},{"year":2008,"finding":"REIC/Dkk-3-induced apoptosis in malignant mesothelioma proceeds through JNK activation, which is regulated by transcriptional downregulation of Id-1 via cooperative binding of ATF3 and Smad to the Id-1 promoter; ATF3 activation is induced by endoplasmic reticulum (ER) stress triggered by REIC/Dkk-3 overexpression.","method":"Adenoviral overexpression, mutagenesis of Id-1 promoter, reporter assays, co-transfection, orthotopic mouse model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — promoter mutagenesis, reporter assays, and in vivo model in one study, defining a mechanistic pathway","pmids":["18922905"],"is_preprint":false},{"year":2008,"finding":"Adenovirus-mediated REIC/Dkk-3 overexpression induces apoptosis in breast cancer cells in a JNK phosphorylation-dependent manner and downregulates P-glycoprotein in multidrug-resistant MCF7/ADR cells through JNK activation, thereby sensitizing cells to doxorubicin.","method":"Adenoviral overexpression, JNK inhibitor, Western blot, drug resistance assays, xenograft","journal":"Cancer gene therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway inhibitor used to confirm mechanism, multiple cell lines, in vivo model","pmids":["18654608"],"is_preprint":false},{"year":2009,"finding":"REIC/Dkk-3 overexpression in normal human fibroblasts (NHF) triggers ER stress and induces production of interleukin-7 (IL-7) via a signaling cascade involving IRE1α, ASK1, p38, and IRF-1. Ad-REIC-infected NHF transplanted with cancer cells suppresses tumor growth, partly abrogated by IL-7 antibody.","method":"Adenoviral overexpression, siRNA knockdown of pathway components, cytokine measurement, co-transplantation tumor model, antibody neutralization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods, pathway dissection with siRNA, functional in vivo neutralization","pmids":["19279003"],"is_preprint":false},{"year":2009,"finding":"Recombinant REIC/Dkk-3 protein induces differentiation of human CD14+ monocytes into a novel dendritic cell-like cell type (REIC/Dkk-3Mo) and induces phosphorylation of STAT1 and STAT3; intratumoral administration suppresses tumor growth with DC and CD8+ T cell accumulation.","method":"Recombinant protein treatment, flow cytometry, STAT phosphorylation assay, in vivo intratumoral injection","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — recombinant protein used, multiple readouts (cell surface markers, signaling, in vivo), single lab","pmids":["19212670"],"is_preprint":false},{"year":2010,"finding":"REIC/Dkk-3 protein is localized to secretory vesicles in a punctate pattern around the nucleus in normal cells, and predominantly in the endoplasmic reticulum (ER) in cancer cells stably transfected with REIC/Dkk-3. Soluble recombinant REIC/Dkk-3 promotes prostatic acinar morphogenesis of RWPE-1 cells.","method":"Immunohistochemistry, confocal microscopy, recombinant protein treatment, 3D acinar morphogenesis assay","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct localization by confocal microscopy, functional recombinant protein assay, single lab","pmids":["21042718"],"is_preprint":false},{"year":2011,"finding":"REIC/Dkk-3 physically interacts with dynein light chain Tctex-1 via its 136–157 amino acid region (containing a [-E-X-G-R-R-X-H-] motif); both proteins co-localize around the ER in human fibroblasts.","method":"Yeast two-hybrid screening, mammalian two-hybrid system with deletion mutants, immunocytochemistry","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus mammalian two-hybrid confirmation with domain mapping, co-localization by immunocytochemistry, single lab","pmids":["21835165"],"is_preprint":false},{"year":2011,"finding":"In renal cell carcinoma cells, Dkk-3 does not inhibit the canonical Wnt/β-catenin pathway but induces apoptosis via the non-canonical JNK pathway; Dkk-3 overexpression also increases p21, MDM-2, and Puma expression and induces G0/G1 arrest. Dkk-3 expression is regulated by histone modification rather than CpG methylation in RCC.","method":"Plasmid transfection, JNK pathway inhibitors, flow cytometry, Western blot, nude mouse xenograft, chromatin modification analysis","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mechanistic readouts (pathway, cell cycle, epigenetic regulation), single lab","pmids":["21268126"],"is_preprint":false},{"year":2007,"finding":"Heat shock protein Hsp70/72 is a key determinant of tumor cell-specific apoptosis induced by REIC/Dkk-3: cancer cells with low Hsp70/72 expression are sensitive to Ad-REIC-induced JNK-dependent apoptosis, while Hsp70/72 induction protects cancer cells and its inhibition sensitizes normal cells.","method":"Adenoviral overexpression, Hsp70/72 inducer/inhibitor pharmacological experiments, apoptosis assays","journal":"International journal of molecular medicines","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological gain/loss of function for Hsp70/72, direct mechanistic link to JNK pathway, single lab","pmids":["17549386"],"is_preprint":false},{"year":2010,"finding":"BiP/GRP78 (an ER-resident chaperone) is a major determinant of resistance to Ad-REIC-induced apoptosis: BiP expression levels are inversely correlated with apoptosis rates, and siRNA-mediated downregulation of BiP sensitizes resistant prostate cancer cells to Ad-REIC in vitro and in vivo.","method":"Repeated Ad-REIC exposure to isolate resistant clones, Western blot screening, siRNA knockdown, xenograft model","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined mechanistic link (BiP as resistance determinant), siRNA confirmation, in vivo validation, single lab","pmids":["19626590"],"is_preprint":false},{"year":2008,"finding":"An N-terminal 78 amino acid truncation of REIC/Dkk-3 is sufficient to induce ER stress and apoptosis in prostate cancer cells, identifying the N-terminal region as critical for ER stress induction.","method":"Truncation mutant construction, ER stress reporter, apoptosis assays, in vivo polymer-plasmid delivery","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — domain deletion/truncation approach with functional ER stress and apoptosis readouts, in vivo proof-of-concept, single lab","pmids":["18727918"],"is_preprint":false},{"year":2016,"finding":"DKK3 in hepatocytes physically interacts with ASK1 under palmitate stimulation and inhibits activation of the downstream P38/JNK pathway. Hepatocyte-specific DKK3 overexpression improves insulin sensitivity and reduces hepatic steatosis, while DKK3 deficiency worsens these; dominant-negative ASK1 blocks DKK3-deficiency effects and constitutively active ASK1 overcomes DKK3 overexpression effects.","method":"Co-immunoprecipitation, hepatocyte-specific KO and overexpression mouse models, dominant-negative/constitutively active ASK1 epistasis, Western blot, metabolic phenotyping","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifying direct DKK3-ASK1 interaction, genetic epistasis with dominant-negative and constitutively active constructs, tissue-specific KO/OE, replicated in multiple obesity models","pmids":["27016281"],"is_preprint":false},{"year":2017,"finding":"DKK3 induces differentiation of Sca1+ vascular progenitors and fibroblasts into smooth muscle cells via activation of TGF-β/ATF6 and Wnt signaling pathways. Absence of DKK3 (DKK3-/- ApoE-/- mice) leads to vulnerable atherosclerotic plaques with reduced SMC numbers and matrix deposition.","method":"DKK3-/- mouse model, ApoE-/- atherosclerosis model, in vitro differentiation assays, Western blot for TGF-β/ATF6 and Wnt pathways, carotid stenosis model","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO model, in vitro mechanistic pathway analysis, therapeutic model, multiple orthogonal methods","pmids":["29284609"],"is_preprint":false},{"year":2018,"finding":"Dkk3 induces nuclear import of β-catenin and enhances its interaction with FoxO3, which activates transcription of E3 ubiquitin ligases Fbxo32 and Trim63 (atrogin-1 and MuRF1), driving muscle atrophy. Forced Dkk3 expression in young mice causes muscle atrophy; reducing expression in old muscles restores muscle size and function.","method":"Transgenic/KO mouse models, co-immunoprecipitation (β-catenin/FoxO3), luciferase reporter for Fbxo32/Trim63 promoters, protein fractionation for nuclear β-catenin","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP showing β-catenin/FoxO3 interaction, reporter assays, gain/loss-of-function in vivo, multiple orthogonal methods","pmids":["29717119"],"is_preprint":false},{"year":2017,"finding":"DKK3 overexpression in cardiac fibroblasts inhibits ADAM17 phosphorylation, thereby increasing ACE2 expression and promoting AngII degradation; DKK3 also inhibits GSK-3β and β-catenin and decreases nuclear β-catenin translocation. These mechanisms reduce AngII-induced cardiac hypertrophy and fibrosis.","method":"Adenoviral overexpression, siRNA knockdown, Western blot, EdU proliferation assay, immunofluorescence, mouse AngII infusion model","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA confirmation and adenoviral overexpression, pathway mechanistic analysis, in vivo model, single lab","pmids":["29196099"],"is_preprint":false},{"year":2017,"finding":"DKK3 overexpression in HNSCC cells increases phosphorylation of Akt (S473) and c-Jun (Ser63) and promotes cancer cell proliferation, migration, and invasion via PI3K-Akt signaling, not through the canonical Wnt/β-catenin/TCF pathway (TCF/LEF reporter assay was negative).","method":"Plasmid transfection, Western blot, reporter assays (TCF/LEF), PI3K inhibitor (LY294002), migration/invasion assays, xenograft","journal":"Oncology research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway inhibitor confirming mechanism, negative TCF/LEF result explicitly noted, multiple assays, single lab","pmids":["28470144"],"is_preprint":false},{"year":2015,"finding":"The cysteine-rich C-terminal core domain of REIC/Dkk-3 (C17-REIC, ~17 kDa) is sufficient to induce DC-like cell differentiation from monocytes and induces phosphorylation of GSK-3β and STAT proteins at levels comparable to GM-CSF. Full-length and C17-REIC proteins exert anticancer effects in vivo via immune cell activation.","method":"Recombinant truncated protein generation, monocyte differentiation assay, flow cytometry, Western blot (GSK-3β/STAT phosphorylation), in vivo mouse renal adenocarcinoma model","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — recombinant domain protein with functional readouts, in vivo validation, domain sufficiency established, single lab","pmids":["25823913"],"is_preprint":false},{"year":2018,"finding":"CRISPR-dCas9-VPR-mediated induction of endogenous DKK3 expression in PC3 prostate cancer cells inhibits TGF-β/Smad-dependent transcriptional activity and attenuates cell migration and proliferation, confirming a physiological role for endogenous Dkk-3 in limiting TGF-β/Smad signaling.","method":"CRISPR-dCas9-VPR transcriptional activation, TGF-β/Smad reporter assay, migration/proliferation assays, DNMT inhibitor (decitabine)","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR-based endogenous gene activation (not ectopic overexpression), pathway reporter, functional assays, single lab","pmids":["29843383"],"is_preprint":false},{"year":2017,"finding":"DKK3 overexpression in keloid fibroblasts inhibits TGF-β receptor I, TGF-β receptor II expression, and reduces phosphorylation of Smad2 and Smad3, thereby suppressing cell proliferation, inducing apoptosis, and inhibiting collagen I, collagen III, and α-SMA synthesis.","method":"Plasmid transfection (pcDNA3.1-DKK3), Western blot, TGF-β receptor inhibitor (LY2109761), proliferation/apoptosis assays","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibitor of TGF-β receptor used to confirm pathway, gain-of-function with pathway readouts, single lab","pmids":["28458155"],"is_preprint":false},{"year":2015,"finding":"Dkk3 in cardiac tissue activates Dvl1 and key proteins of the canonical Wnt pathway (cytoplasmic/nuclear β-catenin, c-Myc, Axin2) while downregulating non-canonical Wnt pathway proteins (JNK, CaMKII, HDAC4). Dkk3 transgenic expression improves cardiac function in DCM mice; Dkk3 knockout worsens it.","method":"Dkk3 transgenic and KO mice crossed with cTnT(R141W) DCM model mice, Western blot of canonical/non-canonical Wnt pathway components, survival analysis, cardiac morphology","journal":"Laboratory investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic gain and loss of function in disease model, pathway protein analysis, single lab","pmids":["26641069"],"is_preprint":false},{"year":2019,"finding":"DKK3 overexpression in human fibroblasts under defined conditions triggers mesenchymal-to-epithelial transition, upregulates KDR (VEGFR2), and transdifferentiates fibroblasts into functional endothelial cells capable of angiogenesis, regulated by the VEGF/miR-125a-5p/STAT3 axis.","method":"Plasmid overexpression, morphology assays, gene expression profiling, in vitro/in vivo angiogenesis assays, tissue-engineered vascular graft, pathway analysis","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined transdifferentiation conditions, multiple functional assays, pathway mechanism identified, single lab","pmids":["30816803"],"is_preprint":false},{"year":2020,"finding":"DKK3 attenuates JNK/AP-1-mediated neuroinflammation after intracerebral hemorrhage via Kremen-1 and DVL-1 (Dishevelled-1) pathways: rDKK3 administration reduces brain edema and JNK/AP-1 activation, effects abrogated by Kremen-1 siRNA or DVL-1 siRNA knockdown.","method":"Recombinant protein administration, Kremen-1 and DVL-1 siRNA knockdown, Western blot, immunofluorescence, ICH mouse model","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis with two pathway components, in vivo model, multiple readouts, single lab","pmids":["32331523"],"is_preprint":false},{"year":2022,"finding":"DKK3 ameliorates neuropathic pain by inhibiting ASK1/JNK/p38-mediated microglia M1 polarization and neuroinflammation via Kremen-1 and DVL-1 pathways: intrathecal rDKK3 reduces p-ASK1, p-JNK, p-p38 and shifts microglia from M1 to M2; effects reversed by Kremen-1 siRNA or DVL-1 siRNA.","method":"Intrathecal rDKK3 injection, Kremen-1/DVL-1 siRNA, Western blot, immunofluorescence, ELISA, SNI rat model","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis confirming Kremen-1 and DVL-1 as mediators, in vivo model, multiple pathway readouts, single lab","pmids":["35658977"],"is_preprint":false},{"year":2021,"finding":"PRMT5 epigenetically silences DKK3 by binding to its promoter and inducing symmetric methylation of H3R8 and H4R3 histones, leading to DKK3 repression and consequent WNT/β-catenin pathway activation in breast cancer cells.","method":"ChIP assay (PRMT5 binding to DKK3 promoter, H3R8/H4R3 methylation), PRMT5 inhibitor (CMP5), demethylating agents","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct PRMT5 binding and histone methylation at DKK3 promoter, pharmacological inhibition confirmation, single lab","pmids":["33462997"],"is_preprint":false},{"year":2021,"finding":"FoxO4 directly transcriptionally activates Dkk3 (identified by genome-wide occupancy and transcriptomic analyses); recombinant DKK3 protein restores normal IFN-γ production in FoxO4-deficient Th1 cells through downregulation of Lef1 expression.","method":"Genome-wide ChIP-seq occupancy, transcriptomic analysis, conditional T cell FoxO4 KO mice, recombinant DKK3 protein rescue, Listeria infection model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide occupancy ChIP confirming direct transcriptional target, KO mouse model, protein rescue experiment, in vivo infection model","pmids":["36106640"],"is_preprint":false},{"year":2021,"finding":"Loss of Dkk3 in mice reduces liver damage upon acute/chronic injury via increased proliferation of hepatocytes and LGR5+ liver progenitor cells; mechanistically, Dkk3 loss abolishes canonical Wnt signaling and reduces Gli3 expression, resulting in increased Hedgehog-signaling activity.","method":"Dkk3-null mouse model, acute/chronic liver injury models, organoid assays, Wnt and Hedgehog pathway Western blot/reporter analysis, iPSC reprogramming screen","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model, multiple disease contexts, pathway mechanistic analysis linking DKK3 to canonical Wnt and Hedgehog signaling, single lab","pmids":["34306986"],"is_preprint":false},{"year":2023,"finding":"Baf60c in skeletal myofibers interacts with Six4 to synergistically suppress Dkk3 expression; myofiber-specific Baf60c ablation upregulates Dkk3, which acts as a secreted paracrine inhibitor of muscle stem cell differentiation and impairs muscle regeneration in vivo. Dkk3 knockdown in obese mice improves muscle regeneration.","method":"Myofiber-specific Baf60c KO and transgenic mice, co-IP (Baf60c-Six4), luciferase reporter for Dkk3 promoter, in vivo Dkk3 siRNA knockdown, muscle regeneration assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP for Baf60c-Six4 complex, promoter reporter, multiple genetic models (KO, transgenic, siRNA in obese mice), paracrine mechanism defined","pmids":["37284884"],"is_preprint":false},{"year":2015,"finding":"DKK-3 physically interacts with β2-microglobulin (β2M) and suppresses β2M-mediated activation of VEGFR-2/Akt/mTOR signaling and tumor angiogenesis in ovarian carcinoma cells; DKK-3 overexpression reduces VEGFR-2/Akt/mTOR phosphorylation and luciferase reporter activity.","method":"Co-immunoprecipitation, luciferase assay, Western blot, overexpression/siRNA knockdown of β2M","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying DKK3-β2M interaction, pathway readouts, single lab","pmids":["26278164"],"is_preprint":false},{"year":2017,"finding":"The Dkk3 locus encodes an additional intracellular isoform, Dkk3b, originating from a transcriptional start site in intron 2. Dkk3b protein sequesters cytoplasmic unphosphorylated β-catenin in an extra-nuclear complex with β-TrCP, preventing β-catenin nuclear translocation and thereby arresting β-catenin-driven cell proliferation.","method":"Identification of novel transcript/protein, co-immunoprecipitation (Dkk3b-β-catenin-β-TrCP complex), subcellular fractionation, proliferation assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying the ternary complex, fractionation showing cytoplasmic sequestration, single lab","pmids":["28738084"],"is_preprint":false},{"year":2014,"finding":"Pax6 and Pax6(5a) directly bind a conserved binding site in the Dkk3 promoter (within a 200 bp region upstream of the TSS) and transcriptionally activate Dkk3 expression; mutation of this binding site abolishes transcriptional activation. Pax6-expressing fibroblasts show reduced responsiveness to canonical Wnt pathway stimulation.","method":"EMSA, promoter deletion/mutagenesis, luciferase reporter assay, RT-qPCR, Western blot, PAX6 siRNA knockdown in human cell lines","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — EMSA confirming direct binding, promoter mutagenesis abrogating activation, functional Wnt pathway readout, single lab","pmids":["25029272"],"is_preprint":false},{"year":2021,"finding":"MYC suppresses DKK3 transcription through the miR-17-92 cluster member miR-92a; DKK3 overexpression suppresses Wnt signaling in Apc-null murine colonic organoids and human colon cancer cells despite downstream activating mutations in the Wnt pathway.","method":"miR-92a overexpression/knockdown, DKK3 overexpression/knockdown, Wnt reporter assay, organoid assay, syngeneic orthotopic metastasis model","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic relationship MYC→miR-92a→DKK3 established, functional DKK3 Wnt suppression in relevant disease models, single lab","pmids":["34593610"],"is_preprint":false},{"year":2006,"finding":"DKK3 delivered by adenovirus to human adrenocortical cells inhibits aldosterone and cortisol biosynthesis (alone or with cAMP) and decreases cAMP-stimulated CYP17 mRNA, indicating a direct functional role for DKK3 in adrenocortical steroidogenesis.","method":"Adenoviral DKK3 delivery to primary adrenocortical cells, steroid biosynthesis measurement, real-time PCR for steroidogenic enzymes","journal":"Hormone and metabolic research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct adenoviral delivery with functional steroidogenic readouts, single lab, primary human cells","pmids":["16981135"],"is_preprint":false},{"year":2024,"finding":"DKK3 upregulation (driven by METTL3-mediated m6A modification) activates the Wnt/β-catenin pathway by binding to the MFF promoter via TCF4/β-catenin, increasing MFF transcription, causing mitochondrial fission, oxidative stress, and renal fibrosis; DKK3 knockdown alleviates these effects.","method":"ChIP (DKK3 binding to MFF promoter), MeRIP (m6A), RIP, dual-luciferase assay, siRNA knockdown, UUO mouse model, Western blot","journal":"Renal failure","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating DKK3 interaction at MFF promoter, m6A modification identified, in vivo UUO model, single lab","pmids":["38682264"],"is_preprint":false},{"year":2022,"finding":"DKK3 secreted by human amniotic mesenchymal stem cells inhibits hepatic stellate cell activation and liver fibrosis by blocking the canonical Wnt/β-catenin signaling pathway, as demonstrated by siRNA knockdown of DKK3 in hAMSCs reversing the anti-fibrotic effect.","method":"hAMSC transplantation, antibody array, siRNA knockdown of DKK3 in hAMSCs, Western blot for Wnt/β-catenin pathway, CCl4-induced fibrosis model","journal":"Stem cell research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown of DKK3 in secreting cells reverses effect, in vivo fibrosis model, pathway analysis, single lab","pmids":["35659360"],"is_preprint":false},{"year":2021,"finding":"Dkk3 directly interacts with β-catenin (shown by co-immunoprecipitation and immunofluorescence co-localization); overexpression of Dkk3 promotes osteogenic differentiation of BMSCs by inhibiting this interaction and activating downstream osteogenic gene transcription.","method":"Co-immunoprecipitation, immunofluorescence co-localization, luciferase reporter (miR-129-5p/Dkk3), Western blot, osteogenic differentiation assays, in vivo calvaria defect model","journal":"Stem cells international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating direct Dkk3-β-catenin interaction, in vitro and in vivo osteogenic assays, single lab","pmids":["34326879"],"is_preprint":false}],"current_model":"DKK3/REIC is a secreted, N-glycosylated glycoprotein (with cytosolic and secreted isoforms, plus an intracellular isoform Dkk3b) whose mechanistic actions are highly context-dependent: in most cancers it acts as a tumor suppressor by triggering ER stress-dependent JNK activation (regulated by Hsp70/72 and BiP/GRP78 levels), inducing apoptosis via ATF3/Smad-mediated Id-1 repression, inhibiting Wnt/β-catenin signaling (through Dkk3b sequestration of β-catenin with β-TrCP or extracellular antagonism), suppressing TGF-β/Smad signaling, and engaging ASK1 to block P38/JNK in metabolic tissues; its C-terminal cysteine-rich domain mediates monocyte-to-dendritic-cell differentiation via STAT1/3 and GSK-3β phosphorylation; it interacts with the dynein light chain Tctex-1 near the ER; in vascular biology it drives SMC differentiation via TGF-β/ATF6/Wnt pathways; in muscle it is regulated by a Baf60c-Six4 transcriptional complex and acts as a paracrine inhibitor of muscle stem cell differentiation via β-catenin/FoxO3-driven atrogene transcription; in immune cells FoxO4 directly transcribes Dkk3, whose protein then suppresses Th1 IFN-γ via Lef1 downregulation; and in HNSCC it paradoxically acts as an oncogene through PI3K/Akt signaling."},"narrative":{"mechanistic_narrative":"DKK3 (REIC) is a secreted, N-glycosylated Dickkopf-family glycoprotein that functions as a context-dependent regulator of cell survival, differentiation, and Wnt/TGF-β signaling, acting predominantly as a tumor suppressor whose expression is lost in immortalized and tumor-derived cells [PMID:10652205, PMID:15516983]. In cancer cells, restoring DKK3 triggers endoplasmic reticulum stress and JNK-dependent apoptosis, with mitochondrial Bax translocation and Bcl-2 loss, selectively in malignant but not normal cells [PMID:16266978, PMID:18922905]; an N-terminal region is sufficient to drive ER stress and apoptosis [PMID:18727918], while the chaperones Hsp70/72 and ER-resident BiP/GRP78 set the threshold for this killing, with low levels conferring sensitivity [PMID:17549386, PMID:19626590]. Downstream, ER-stress-induced ATF3 cooperates with Smad to repress Id-1 and activate JNK [PMID:18922905]. DKK3 restrains Wnt/β-catenin signaling through multiple routes: blocking β-catenin nuclear accumulation and TCF-4 target genes c-Myc and cyclin D1 [PMID:18048388], direct β-catenin binding [PMID:34326879], and an intracellular isoform Dkk3b that sequesters cytoplasmic β-catenin with β-TrCP [PMID:28738084]. It also suppresses TGF-β/Smad signaling by reducing TGF-β receptor levels and Smad2/3 phosphorylation [PMID:29843383, PMID:28458155]. Beyond cancer, DKK3 controls differentiation and tissue homeostasis: it drives monocyte-to-dendritic-cell differentiation and STAT/GSK-3β phosphorylation via its cysteine-rich C-terminal domain [PMID:19212670, PMID:25823913], binds and inhibits ASK1 to block P38/JNK signaling in hepatocytes and improve insulin sensitivity [PMID:27016281], promotes smooth-muscle differentiation of vascular progenitors via TGF-β/ATF6 and Wnt [PMID:29284609], and acts as a paracrine inhibitor of muscle stem cell differentiation by enhancing nuclear β-catenin–FoxO3 transcription of the atrogenes Fbxo32 and Trim63 [PMID:29717119]. Its transcription is controlled by activators (Pax6, FoxO4) and repressors (PRMT5-mediated histone methylation, MYC-miR-92a, Baf60c-Six4) [PMID:25029272, PMID:36106640, PMID:33462997, PMID:34593610, PMID:37284884]. In HNSCC, DKK3 paradoxically acts as an oncogene through PI3K/Akt signaling independent of Wnt/TCF [PMID:28470144].","teleology":[{"year":2000,"claim":"Establishing DKK3 as a Dickkopf-family secreted protein lost in transformed cells framed it as a candidate tumor suppressor.","evidence":"cDNA cloning, sequence/structural analysis, and Northern expression profiling across normal vs immortalized/tumor cell lines","pmids":["10652205"],"confidence":"Medium","gaps":["No mechanism for the growth/expression difference defined","Secretion and processing not yet biochemically resolved"]},{"year":2004,"claim":"Biochemical characterization showed DKK3 exists as cytosolic and secreted N-glycosylated isoforms and that ectopic expression suppresses tumor growth, linking the protein to growth control.","evidence":"Western blot, glycosylation analysis, colony formation, and xenograft assays","pmids":["15516983"],"confidence":"Medium","gaps":["Apoptotic mechanism unresolved","Relationship between isoforms and function unclear"]},{"year":2005,"claim":"Defining that DKK3 re-expression kills cancer cells via JNK and mitochondrial apoptosis, selectively sparing normal cells, established its therapeutic tumor-suppressor mechanism.","evidence":"Adenoviral overexpression, JNK and apoptosis assays, Bax/Bcl-2 readouts, xenograft in prostate cancer","pmids":["16266978"],"confidence":"High","gaps":["Upstream trigger of JNK not yet identified","Basis of cancer-cell selectivity unknown"]},{"year":2008,"claim":"Identifying ER stress as the upstream trigger and the ATF3/Smad-Id-1-JNK axis, plus N-terminal sufficiency, connected DKK3 expression to a defined pro-apoptotic cascade.","evidence":"Adenoviral overexpression, Id-1 promoter mutagenesis/reporter assays, truncation mutants, ER stress reporters, orthotopic and in vivo delivery models","pmids":["18922905","18727918","18654608"],"confidence":"High","gaps":["How intracellular DKK3 initiates ER stress mechanistically unresolved","Receptor for the apoptotic signal not defined"]},{"year":2010,"claim":"Identifying Hsp70/72 and BiP/GRP78 as determinants of sensitivity explained the cancer-selective and resistance phenotypes of DKK3-induced apoptosis.","evidence":"Pharmacological induction/inhibition of Hsp70/72, isolation of resistant clones, BiP siRNA knockdown, xenograft validation","pmids":["17549386","19626590"],"confidence":"Medium","gaps":["Direct molecular interaction of DKK3 with these chaperones not shown","Single-lab pharmacology"]},{"year":2008,"claim":"Showing DKK3 inhibits Wnt/β-catenin signaling via reciprocal gain/loss-of-function clarified a second, non-apoptotic tumor-suppressive arm.","evidence":"Ectopic expression and siRNA, TCF/LEF reporter, nuclear fractionation in lung cancer","pmids":["18048388"],"confidence":"High","gaps":["Mechanism of β-catenin inhibition not yet defined in this context","Extracellular vs intracellular site of action unclear"]},{"year":2011,"claim":"Subcellular localization, Tctex-1 interaction, and demonstration that some cancers use JNK-only (not Wnt) apoptosis revealed context-dependence and a dynein-linked ER association.","evidence":"Confocal microscopy, yeast/mammalian two-hybrid with domain mapping, JNK inhibitors and cell-cycle/epigenetic analysis in RCC","pmids":["21042718","21835165","21268126"],"confidence":"Medium","gaps":["Functional consequence of Tctex-1 interaction untested","Determinants of Wnt-dependent vs JNK-only response unknown"]},{"year":2015,"claim":"Mapping immune and angiogenic functions to specific DKK3 domains/partners established roles beyond cancer-cell-intrinsic apoptosis.","evidence":"C17-REIC recombinant domain protein with monocyte differentiation and STAT/GSK-3β readouts; Co-IP of DKK3-β2-microglobulin with VEGFR-2/Akt/mTOR readouts","pmids":["25823913","26278164","19212670"],"confidence":"Medium","gaps":["Cell-surface receptor for DKK3 immune signaling not identified","β2M interaction not reciprocally validated structurally"]},{"year":2016,"claim":"Co-IP and ASK1 epistasis defined a direct DKK3-ASK1 interaction that inhibits P38/JNK in metabolic tissue, expanding DKK3 to a physiological signaling regulator.","evidence":"Co-immunoprecipitation, hepatocyte-specific KO/overexpression, dominant-negative and constitutively active ASK1 epistasis, metabolic phenotyping","pmids":["27016281"],"confidence":"High","gaps":["Whether ASK1 binding underlies the cancer apoptosis JNK axis untested","Direct binding interface not mapped"]},{"year":2018,"claim":"Identifying nuclear β-catenin/FoxO3-driven atrogene transcription, endogenous CRISPR-activation suppressing TGF-β/Smad, and the Dkk3b/β-TrCP sequestering isoform resolved distinct mechanisms by which DKK3 acts on β-catenin and TGF-β.","evidence":"Co-IP (β-catenin/FoxO3, Dkk3b/β-catenin/β-TrCP), reporter assays, transgenic/KO mice, CRISPR-dCas9-VPR endogenous activation","pmids":["29717119","29843383","28738084"],"confidence":"High","gaps":["How a secreted protein gains nuclear/cytoplasmic β-catenin access unresolved","Receptor mediating TGF-β suppression unknown"]},{"year":2017,"claim":"Genetic and pharmacological studies established DKK3 as a driver of vascular/cardiac differentiation and a tissue-protective TGF-β/Wnt regulator, and uncovered an oncogenic PI3K/Akt mode in HNSCC.","evidence":"DKK3-/- atherosclerosis and AngII cardiac models, keloid fibroblast TGF-βR inhibition, PI3K inhibitor in HNSCC xenografts","pmids":["29284609","29196099","28458155","28470144"],"confidence":"High","gaps":["Why DKK3 switches between tumor-suppressor and oncogene contexts unknown","Receptor identity across these contexts undefined"]},{"year":2021,"claim":"Defining transcriptional regulators (Pax6, FoxO4 activators; PRMT5, MYC-miR-92a, Baf60c-Six4 repressors) and immune/regeneration outputs placed DKK3 in defined gene-regulatory and paracrine circuits.","evidence":"ChIP/ChIP-seq, EMSA, promoter mutagenesis, Co-IP, conditional KO mice, organoids, and rescue/infection models","pmids":["25029272","36106640","33462997","34593610","37284884","34306986"],"confidence":"High","gaps":["How upstream regulation integrates to set context-specific DKK3 function unclear","Receptor-level mechanism for paracrine immune/muscle effects undefined"]},{"year":2024,"claim":"Showing DKK3 can also activate Wnt/β-catenin to drive MFF transcription and renal fibrosis demonstrated that DKK3 outputs on β-catenin are bidirectional and context-determined.","evidence":"ChIP, MeRIP/RIP, dual-luciferase, siRNA knockdown, UUO mouse model","pmids":["38682264","35659360"],"confidence":"Medium","gaps":["Determinants of Wnt activation vs inhibition by DKK3 unresolved","Single-lab disease-model evidence"]},{"year":null,"claim":"The cell-surface receptor(s) and unifying molecular logic governing whether DKK3 acts as a tumor suppressor, oncogene, or differentiation factor remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No definitive signaling receptor identified for secreted DKK3","No structural model reconciling intracellular ER/ASK1 actions with secreted paracrine effects","Context determinants of opposing Wnt and apoptotic outputs unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,30,31,37]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[31]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,2,7,8]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[8,9,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,31]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,14,18,31]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,6,13]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,16,23,37]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,19,27]}],"complexes":[],"partners":["ASK1","CTNNB1","FOXO3","TCTEX-1","B2M","BTRC"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UBP4","full_name":"Dickkopf-related protein 3","aliases":[],"length_aa":350,"mass_kda":38.4,"function":"Antagonizes canonical Wnt signaling by inhibiting LRP5/6 interaction with Wnt and by forming a ternary complex with the transmembrane protein KREMEN that promotes internalization of LRP5/6. DKKs play an important role in vertebrate development, where they locally inhibit Wnt regulated processes such as antero-posterior axial patterning, limb development, somitogenesis and eye formation. In the adult, Dkks are implicated in bone formation and bone disease, cancer and Alzheimer disease (By similarity)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q9UBP4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DKK3","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/DKK3","total_profiled":1310},"omim":[{"mim_id":"605418","title":"DICKKOPF-LIKE 1; DKKL1","url":"https://www.omim.org/entry/605418"},{"mim_id":"605417","title":"DICKKOPF WNT SIGNALING PATHWAY INHIBITOR 4; DKK4","url":"https://www.omim.org/entry/605417"},{"mim_id":"605416","title":"DICKKOPF WNT SIGNALING PATHWAY INHIBITOR 3; DKK3","url":"https://www.omim.org/entry/605416"},{"mim_id":"605415","title":"DICKKOPF WNT SIGNALING PATHWAY INHIBITOR 2; DKK2","url":"https://www.omim.org/entry/605415"},{"mim_id":"605189","title":"DICKKOPF WNT SIGNALING PATHWAY INHIBITOR 1; DKK1","url":"https://www.omim.org/entry/605189"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":371.6},{"tissue":"heart muscle","ntpm":1240.0}],"url":"https://www.proteinatlas.org/search/DKK3"},"hgnc":{"alias_symbol":["REIC","RIG","CRRL"],"prev_symbol":[]},"alphafold":{"accession":"Q9UBP4","domains":[{"cath_id":"-","chopping":"91-139","consensus_level":"high","plddt":78.7906,"start":91,"end":139}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBP4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBP4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBP4-F1-predicted_aligned_error_v6.png","plddt_mean":73.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DKK3","jax_strain_url":"https://www.jax.org/strain/search?query=DKK3"},"sequence":{"accession":"Q9UBP4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UBP4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UBP4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBP4"}},"corpus_meta":[{"pmid":"16266978","id":"PMC_16266978","title":"Adenovirus-mediated overexpression of 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EJH","url":"https://pubmed.ncbi.nlm.nih.gov/27349317","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":56423,"output_tokens":9752,"usd":0.157775,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19989,"output_tokens":4959,"usd":0.11196,"stage2_stop_reason":"end_turn"},"total_usd":0.269735,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Adenovirus-mediated overexpression of REIC/Dkk-3 in human prostate cancer cells induces apoptosis through activation of c-Jun-NH2-kinase (JNK), mitochondrial translocation of Bax, and reduction of Bcl-2, selectively in cancer cells lacking endogenous REIC/Dkk-3 but not in normal prostate epithelial/stromal cells.\",\n      \"method\": \"Adenoviral overexpression, apoptosis assays, JNK activation assays, xenograft mouse model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (overexpression, pathway readouts, in vivo xenograft), independently replicated across multiple cancer types in subsequent work\",\n      \"pmids\": [\"16266978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"REIC/Dkk-3 encodes a 350 amino acid secreted protein with coiled-coil structures at N- and C-termini; it is a member of the Dickkopf family and its expression is down-regulated in immortalized and tumor-derived human cell lines compared to normal counterparts.\",\n      \"method\": \"cDNA cloning, sequence analysis, protein database search, expression profiling by Northern blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — original cloning paper, sequence/structural characterization, expression confirmed in multiple cell lines\",\n      \"pmids\": [\"10652205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DKK3/REIC protein exists as two isoforms: a 55 kDa cytosolic form and a 50 kDa secreted form; it is N-glycosylated. Ectopic expression suppresses cell growth and induces apoptosis, and reduces tumor growth in nude mice.\",\n      \"method\": \"Western blot, glycosylation analysis, ectopic expression, colony formation, xenograft\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods (biochemical characterization, in vitro, in vivo)\",\n      \"pmids\": [\"15516983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Downregulation of Dkk3 activates the Wnt/β-catenin pathway in lung cancer: ectopic Dkk3 expression inhibits TCF-4 activity, prevents nuclear accumulation of β-catenin, and reduces expression of TCF-4 targets c-Myc and cyclin D1; siRNA knockdown of Dkk3 is sufficient to promote β-catenin nuclear translocation and c-Myc expression.\",\n      \"method\": \"Ectopic expression, siRNA knockdown, TCF/LEF reporter assay, Western blot, nuclear fractionation\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with defined pathway readouts, multiple orthogonal methods in one study\",\n      \"pmids\": [\"18048388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"REIC/Dkk-3-induced apoptosis in malignant mesothelioma proceeds through JNK activation, which is regulated by transcriptional downregulation of Id-1 via cooperative binding of ATF3 and Smad to the Id-1 promoter; ATF3 activation is induced by endoplasmic reticulum (ER) stress triggered by REIC/Dkk-3 overexpression.\",\n      \"method\": \"Adenoviral overexpression, mutagenesis of Id-1 promoter, reporter assays, co-transfection, orthotopic mouse model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — promoter mutagenesis, reporter assays, and in vivo model in one study, defining a mechanistic pathway\",\n      \"pmids\": [\"18922905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Adenovirus-mediated REIC/Dkk-3 overexpression induces apoptosis in breast cancer cells in a JNK phosphorylation-dependent manner and downregulates P-glycoprotein in multidrug-resistant MCF7/ADR cells through JNK activation, thereby sensitizing cells to doxorubicin.\",\n      \"method\": \"Adenoviral overexpression, JNK inhibitor, Western blot, drug resistance assays, xenograft\",\n      \"journal\": \"Cancer gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway inhibitor used to confirm mechanism, multiple cell lines, in vivo model\",\n      \"pmids\": [\"18654608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"REIC/Dkk-3 overexpression in normal human fibroblasts (NHF) triggers ER stress and induces production of interleukin-7 (IL-7) via a signaling cascade involving IRE1α, ASK1, p38, and IRF-1. Ad-REIC-infected NHF transplanted with cancer cells suppresses tumor growth, partly abrogated by IL-7 antibody.\",\n      \"method\": \"Adenoviral overexpression, siRNA knockdown of pathway components, cytokine measurement, co-transplantation tumor model, antibody neutralization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods, pathway dissection with siRNA, functional in vivo neutralization\",\n      \"pmids\": [\"19279003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Recombinant REIC/Dkk-3 protein induces differentiation of human CD14+ monocytes into a novel dendritic cell-like cell type (REIC/Dkk-3Mo) and induces phosphorylation of STAT1 and STAT3; intratumoral administration suppresses tumor growth with DC and CD8+ T cell accumulation.\",\n      \"method\": \"Recombinant protein treatment, flow cytometry, STAT phosphorylation assay, in vivo intratumoral injection\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — recombinant protein used, multiple readouts (cell surface markers, signaling, in vivo), single lab\",\n      \"pmids\": [\"19212670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"REIC/Dkk-3 protein is localized to secretory vesicles in a punctate pattern around the nucleus in normal cells, and predominantly in the endoplasmic reticulum (ER) in cancer cells stably transfected with REIC/Dkk-3. Soluble recombinant REIC/Dkk-3 promotes prostatic acinar morphogenesis of RWPE-1 cells.\",\n      \"method\": \"Immunohistochemistry, confocal microscopy, recombinant protein treatment, 3D acinar morphogenesis assay\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct localization by confocal microscopy, functional recombinant protein assay, single lab\",\n      \"pmids\": [\"21042718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"REIC/Dkk-3 physically interacts with dynein light chain Tctex-1 via its 136–157 amino acid region (containing a [-E-X-G-R-R-X-H-] motif); both proteins co-localize around the ER in human fibroblasts.\",\n      \"method\": \"Yeast two-hybrid screening, mammalian two-hybrid system with deletion mutants, immunocytochemistry\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus mammalian two-hybrid confirmation with domain mapping, co-localization by immunocytochemistry, single lab\",\n      \"pmids\": [\"21835165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In renal cell carcinoma cells, Dkk-3 does not inhibit the canonical Wnt/β-catenin pathway but induces apoptosis via the non-canonical JNK pathway; Dkk-3 overexpression also increases p21, MDM-2, and Puma expression and induces G0/G1 arrest. Dkk-3 expression is regulated by histone modification rather than CpG methylation in RCC.\",\n      \"method\": \"Plasmid transfection, JNK pathway inhibitors, flow cytometry, Western blot, nude mouse xenograft, chromatin modification analysis\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mechanistic readouts (pathway, cell cycle, epigenetic regulation), single lab\",\n      \"pmids\": [\"21268126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Heat shock protein Hsp70/72 is a key determinant of tumor cell-specific apoptosis induced by REIC/Dkk-3: cancer cells with low Hsp70/72 expression are sensitive to Ad-REIC-induced JNK-dependent apoptosis, while Hsp70/72 induction protects cancer cells and its inhibition sensitizes normal cells.\",\n      \"method\": \"Adenoviral overexpression, Hsp70/72 inducer/inhibitor pharmacological experiments, apoptosis assays\",\n      \"journal\": \"International journal of molecular medicines\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological gain/loss of function for Hsp70/72, direct mechanistic link to JNK pathway, single lab\",\n      \"pmids\": [\"17549386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BiP/GRP78 (an ER-resident chaperone) is a major determinant of resistance to Ad-REIC-induced apoptosis: BiP expression levels are inversely correlated with apoptosis rates, and siRNA-mediated downregulation of BiP sensitizes resistant prostate cancer cells to Ad-REIC in vitro and in vivo.\",\n      \"method\": \"Repeated Ad-REIC exposure to isolate resistant clones, Western blot screening, siRNA knockdown, xenograft model\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined mechanistic link (BiP as resistance determinant), siRNA confirmation, in vivo validation, single lab\",\n      \"pmids\": [\"19626590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"An N-terminal 78 amino acid truncation of REIC/Dkk-3 is sufficient to induce ER stress and apoptosis in prostate cancer cells, identifying the N-terminal region as critical for ER stress induction.\",\n      \"method\": \"Truncation mutant construction, ER stress reporter, apoptosis assays, in vivo polymer-plasmid delivery\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — domain deletion/truncation approach with functional ER stress and apoptosis readouts, in vivo proof-of-concept, single lab\",\n      \"pmids\": [\"18727918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DKK3 in hepatocytes physically interacts with ASK1 under palmitate stimulation and inhibits activation of the downstream P38/JNK pathway. Hepatocyte-specific DKK3 overexpression improves insulin sensitivity and reduces hepatic steatosis, while DKK3 deficiency worsens these; dominant-negative ASK1 blocks DKK3-deficiency effects and constitutively active ASK1 overcomes DKK3 overexpression effects.\",\n      \"method\": \"Co-immunoprecipitation, hepatocyte-specific KO and overexpression mouse models, dominant-negative/constitutively active ASK1 epistasis, Western blot, metabolic phenotyping\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifying direct DKK3-ASK1 interaction, genetic epistasis with dominant-negative and constitutively active constructs, tissue-specific KO/OE, replicated in multiple obesity models\",\n      \"pmids\": [\"27016281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DKK3 induces differentiation of Sca1+ vascular progenitors and fibroblasts into smooth muscle cells via activation of TGF-β/ATF6 and Wnt signaling pathways. Absence of DKK3 (DKK3-/- ApoE-/- mice) leads to vulnerable atherosclerotic plaques with reduced SMC numbers and matrix deposition.\",\n      \"method\": \"DKK3-/- mouse model, ApoE-/- atherosclerosis model, in vitro differentiation assays, Western blot for TGF-β/ATF6 and Wnt pathways, carotid stenosis model\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO model, in vitro mechanistic pathway analysis, therapeutic model, multiple orthogonal methods\",\n      \"pmids\": [\"29284609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Dkk3 induces nuclear import of β-catenin and enhances its interaction with FoxO3, which activates transcription of E3 ubiquitin ligases Fbxo32 and Trim63 (atrogin-1 and MuRF1), driving muscle atrophy. Forced Dkk3 expression in young mice causes muscle atrophy; reducing expression in old muscles restores muscle size and function.\",\n      \"method\": \"Transgenic/KO mouse models, co-immunoprecipitation (β-catenin/FoxO3), luciferase reporter for Fbxo32/Trim63 promoters, protein fractionation for nuclear β-catenin\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP showing β-catenin/FoxO3 interaction, reporter assays, gain/loss-of-function in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"29717119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DKK3 overexpression in cardiac fibroblasts inhibits ADAM17 phosphorylation, thereby increasing ACE2 expression and promoting AngII degradation; DKK3 also inhibits GSK-3β and β-catenin and decreases nuclear β-catenin translocation. These mechanisms reduce AngII-induced cardiac hypertrophy and fibrosis.\",\n      \"method\": \"Adenoviral overexpression, siRNA knockdown, Western blot, EdU proliferation assay, immunofluorescence, mouse AngII infusion model\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA confirmation and adenoviral overexpression, pathway mechanistic analysis, in vivo model, single lab\",\n      \"pmids\": [\"29196099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DKK3 overexpression in HNSCC cells increases phosphorylation of Akt (S473) and c-Jun (Ser63) and promotes cancer cell proliferation, migration, and invasion via PI3K-Akt signaling, not through the canonical Wnt/β-catenin/TCF pathway (TCF/LEF reporter assay was negative).\",\n      \"method\": \"Plasmid transfection, Western blot, reporter assays (TCF/LEF), PI3K inhibitor (LY294002), migration/invasion assays, xenograft\",\n      \"journal\": \"Oncology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway inhibitor confirming mechanism, negative TCF/LEF result explicitly noted, multiple assays, single lab\",\n      \"pmids\": [\"28470144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The cysteine-rich C-terminal core domain of REIC/Dkk-3 (C17-REIC, ~17 kDa) is sufficient to induce DC-like cell differentiation from monocytes and induces phosphorylation of GSK-3β and STAT proteins at levels comparable to GM-CSF. Full-length and C17-REIC proteins exert anticancer effects in vivo via immune cell activation.\",\n      \"method\": \"Recombinant truncated protein generation, monocyte differentiation assay, flow cytometry, Western blot (GSK-3β/STAT phosphorylation), in vivo mouse renal adenocarcinoma model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — recombinant domain protein with functional readouts, in vivo validation, domain sufficiency established, single lab\",\n      \"pmids\": [\"25823913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRISPR-dCas9-VPR-mediated induction of endogenous DKK3 expression in PC3 prostate cancer cells inhibits TGF-β/Smad-dependent transcriptional activity and attenuates cell migration and proliferation, confirming a physiological role for endogenous Dkk-3 in limiting TGF-β/Smad signaling.\",\n      \"method\": \"CRISPR-dCas9-VPR transcriptional activation, TGF-β/Smad reporter assay, migration/proliferation assays, DNMT inhibitor (decitabine)\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-based endogenous gene activation (not ectopic overexpression), pathway reporter, functional assays, single lab\",\n      \"pmids\": [\"29843383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DKK3 overexpression in keloid fibroblasts inhibits TGF-β receptor I, TGF-β receptor II expression, and reduces phosphorylation of Smad2 and Smad3, thereby suppressing cell proliferation, inducing apoptosis, and inhibiting collagen I, collagen III, and α-SMA synthesis.\",\n      \"method\": \"Plasmid transfection (pcDNA3.1-DKK3), Western blot, TGF-β receptor inhibitor (LY2109761), proliferation/apoptosis assays\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibitor of TGF-β receptor used to confirm pathway, gain-of-function with pathway readouts, single lab\",\n      \"pmids\": [\"28458155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dkk3 in cardiac tissue activates Dvl1 and key proteins of the canonical Wnt pathway (cytoplasmic/nuclear β-catenin, c-Myc, Axin2) while downregulating non-canonical Wnt pathway proteins (JNK, CaMKII, HDAC4). Dkk3 transgenic expression improves cardiac function in DCM mice; Dkk3 knockout worsens it.\",\n      \"method\": \"Dkk3 transgenic and KO mice crossed with cTnT(R141W) DCM model mice, Western blot of canonical/non-canonical Wnt pathway components, survival analysis, cardiac morphology\",\n      \"journal\": \"Laboratory investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic gain and loss of function in disease model, pathway protein analysis, single lab\",\n      \"pmids\": [\"26641069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DKK3 overexpression in human fibroblasts under defined conditions triggers mesenchymal-to-epithelial transition, upregulates KDR (VEGFR2), and transdifferentiates fibroblasts into functional endothelial cells capable of angiogenesis, regulated by the VEGF/miR-125a-5p/STAT3 axis.\",\n      \"method\": \"Plasmid overexpression, morphology assays, gene expression profiling, in vitro/in vivo angiogenesis assays, tissue-engineered vascular graft, pathway analysis\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined transdifferentiation conditions, multiple functional assays, pathway mechanism identified, single lab\",\n      \"pmids\": [\"30816803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DKK3 attenuates JNK/AP-1-mediated neuroinflammation after intracerebral hemorrhage via Kremen-1 and DVL-1 (Dishevelled-1) pathways: rDKK3 administration reduces brain edema and JNK/AP-1 activation, effects abrogated by Kremen-1 siRNA or DVL-1 siRNA knockdown.\",\n      \"method\": \"Recombinant protein administration, Kremen-1 and DVL-1 siRNA knockdown, Western blot, immunofluorescence, ICH mouse model\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis with two pathway components, in vivo model, multiple readouts, single lab\",\n      \"pmids\": [\"32331523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DKK3 ameliorates neuropathic pain by inhibiting ASK1/JNK/p38-mediated microglia M1 polarization and neuroinflammation via Kremen-1 and DVL-1 pathways: intrathecal rDKK3 reduces p-ASK1, p-JNK, p-p38 and shifts microglia from M1 to M2; effects reversed by Kremen-1 siRNA or DVL-1 siRNA.\",\n      \"method\": \"Intrathecal rDKK3 injection, Kremen-1/DVL-1 siRNA, Western blot, immunofluorescence, ELISA, SNI rat model\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis confirming Kremen-1 and DVL-1 as mediators, in vivo model, multiple pathway readouts, single lab\",\n      \"pmids\": [\"35658977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT5 epigenetically silences DKK3 by binding to its promoter and inducing symmetric methylation of H3R8 and H4R3 histones, leading to DKK3 repression and consequent WNT/β-catenin pathway activation in breast cancer cells.\",\n      \"method\": \"ChIP assay (PRMT5 binding to DKK3 promoter, H3R8/H4R3 methylation), PRMT5 inhibitor (CMP5), demethylating agents\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct PRMT5 binding and histone methylation at DKK3 promoter, pharmacological inhibition confirmation, single lab\",\n      \"pmids\": [\"33462997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FoxO4 directly transcriptionally activates Dkk3 (identified by genome-wide occupancy and transcriptomic analyses); recombinant DKK3 protein restores normal IFN-γ production in FoxO4-deficient Th1 cells through downregulation of Lef1 expression.\",\n      \"method\": \"Genome-wide ChIP-seq occupancy, transcriptomic analysis, conditional T cell FoxO4 KO mice, recombinant DKK3 protein rescue, Listeria infection model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide occupancy ChIP confirming direct transcriptional target, KO mouse model, protein rescue experiment, in vivo infection model\",\n      \"pmids\": [\"36106640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of Dkk3 in mice reduces liver damage upon acute/chronic injury via increased proliferation of hepatocytes and LGR5+ liver progenitor cells; mechanistically, Dkk3 loss abolishes canonical Wnt signaling and reduces Gli3 expression, resulting in increased Hedgehog-signaling activity.\",\n      \"method\": \"Dkk3-null mouse model, acute/chronic liver injury models, organoid assays, Wnt and Hedgehog pathway Western blot/reporter analysis, iPSC reprogramming screen\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model, multiple disease contexts, pathway mechanistic analysis linking DKK3 to canonical Wnt and Hedgehog signaling, single lab\",\n      \"pmids\": [\"34306986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Baf60c in skeletal myofibers interacts with Six4 to synergistically suppress Dkk3 expression; myofiber-specific Baf60c ablation upregulates Dkk3, which acts as a secreted paracrine inhibitor of muscle stem cell differentiation and impairs muscle regeneration in vivo. Dkk3 knockdown in obese mice improves muscle regeneration.\",\n      \"method\": \"Myofiber-specific Baf60c KO and transgenic mice, co-IP (Baf60c-Six4), luciferase reporter for Dkk3 promoter, in vivo Dkk3 siRNA knockdown, muscle regeneration assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP for Baf60c-Six4 complex, promoter reporter, multiple genetic models (KO, transgenic, siRNA in obese mice), paracrine mechanism defined\",\n      \"pmids\": [\"37284884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DKK-3 physically interacts with β2-microglobulin (β2M) and suppresses β2M-mediated activation of VEGFR-2/Akt/mTOR signaling and tumor angiogenesis in ovarian carcinoma cells; DKK-3 overexpression reduces VEGFR-2/Akt/mTOR phosphorylation and luciferase reporter activity.\",\n      \"method\": \"Co-immunoprecipitation, luciferase assay, Western blot, overexpression/siRNA knockdown of β2M\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying DKK3-β2M interaction, pathway readouts, single lab\",\n      \"pmids\": [\"26278164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The Dkk3 locus encodes an additional intracellular isoform, Dkk3b, originating from a transcriptional start site in intron 2. Dkk3b protein sequesters cytoplasmic unphosphorylated β-catenin in an extra-nuclear complex with β-TrCP, preventing β-catenin nuclear translocation and thereby arresting β-catenin-driven cell proliferation.\",\n      \"method\": \"Identification of novel transcript/protein, co-immunoprecipitation (Dkk3b-β-catenin-β-TrCP complex), subcellular fractionation, proliferation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying the ternary complex, fractionation showing cytoplasmic sequestration, single lab\",\n      \"pmids\": [\"28738084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Pax6 and Pax6(5a) directly bind a conserved binding site in the Dkk3 promoter (within a 200 bp region upstream of the TSS) and transcriptionally activate Dkk3 expression; mutation of this binding site abolishes transcriptional activation. Pax6-expressing fibroblasts show reduced responsiveness to canonical Wnt pathway stimulation.\",\n      \"method\": \"EMSA, promoter deletion/mutagenesis, luciferase reporter assay, RT-qPCR, Western blot, PAX6 siRNA knockdown in human cell lines\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — EMSA confirming direct binding, promoter mutagenesis abrogating activation, functional Wnt pathway readout, single lab\",\n      \"pmids\": [\"25029272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MYC suppresses DKK3 transcription through the miR-17-92 cluster member miR-92a; DKK3 overexpression suppresses Wnt signaling in Apc-null murine colonic organoids and human colon cancer cells despite downstream activating mutations in the Wnt pathway.\",\n      \"method\": \"miR-92a overexpression/knockdown, DKK3 overexpression/knockdown, Wnt reporter assay, organoid assay, syngeneic orthotopic metastasis model\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic relationship MYC→miR-92a→DKK3 established, functional DKK3 Wnt suppression in relevant disease models, single lab\",\n      \"pmids\": [\"34593610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DKK3 delivered by adenovirus to human adrenocortical cells inhibits aldosterone and cortisol biosynthesis (alone or with cAMP) and decreases cAMP-stimulated CYP17 mRNA, indicating a direct functional role for DKK3 in adrenocortical steroidogenesis.\",\n      \"method\": \"Adenoviral DKK3 delivery to primary adrenocortical cells, steroid biosynthesis measurement, real-time PCR for steroidogenic enzymes\",\n      \"journal\": \"Hormone and metabolic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct adenoviral delivery with functional steroidogenic readouts, single lab, primary human cells\",\n      \"pmids\": [\"16981135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DKK3 upregulation (driven by METTL3-mediated m6A modification) activates the Wnt/β-catenin pathway by binding to the MFF promoter via TCF4/β-catenin, increasing MFF transcription, causing mitochondrial fission, oxidative stress, and renal fibrosis; DKK3 knockdown alleviates these effects.\",\n      \"method\": \"ChIP (DKK3 binding to MFF promoter), MeRIP (m6A), RIP, dual-luciferase assay, siRNA knockdown, UUO mouse model, Western blot\",\n      \"journal\": \"Renal failure\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating DKK3 interaction at MFF promoter, m6A modification identified, in vivo UUO model, single lab\",\n      \"pmids\": [\"38682264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DKK3 secreted by human amniotic mesenchymal stem cells inhibits hepatic stellate cell activation and liver fibrosis by blocking the canonical Wnt/β-catenin signaling pathway, as demonstrated by siRNA knockdown of DKK3 in hAMSCs reversing the anti-fibrotic effect.\",\n      \"method\": \"hAMSC transplantation, antibody array, siRNA knockdown of DKK3 in hAMSCs, Western blot for Wnt/β-catenin pathway, CCl4-induced fibrosis model\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown of DKK3 in secreting cells reverses effect, in vivo fibrosis model, pathway analysis, single lab\",\n      \"pmids\": [\"35659360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Dkk3 directly interacts with β-catenin (shown by co-immunoprecipitation and immunofluorescence co-localization); overexpression of Dkk3 promotes osteogenic differentiation of BMSCs by inhibiting this interaction and activating downstream osteogenic gene transcription.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, luciferase reporter (miR-129-5p/Dkk3), Western blot, osteogenic differentiation assays, in vivo calvaria defect model\",\n      \"journal\": \"Stem cells international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating direct Dkk3-β-catenin interaction, in vitro and in vivo osteogenic assays, single lab\",\n      \"pmids\": [\"34326879\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DKK3/REIC is a secreted, N-glycosylated glycoprotein (with cytosolic and secreted isoforms, plus an intracellular isoform Dkk3b) whose mechanistic actions are highly context-dependent: in most cancers it acts as a tumor suppressor by triggering ER stress-dependent JNK activation (regulated by Hsp70/72 and BiP/GRP78 levels), inducing apoptosis via ATF3/Smad-mediated Id-1 repression, inhibiting Wnt/β-catenin signaling (through Dkk3b sequestration of β-catenin with β-TrCP or extracellular antagonism), suppressing TGF-β/Smad signaling, and engaging ASK1 to block P38/JNK in metabolic tissues; its C-terminal cysteine-rich domain mediates monocyte-to-dendritic-cell differentiation via STAT1/3 and GSK-3β phosphorylation; it interacts with the dynein light chain Tctex-1 near the ER; in vascular biology it drives SMC differentiation via TGF-β/ATF6/Wnt pathways; in muscle it is regulated by a Baf60c-Six4 transcriptional complex and acts as a paracrine inhibitor of muscle stem cell differentiation via β-catenin/FoxO3-driven atrogene transcription; in immune cells FoxO4 directly transcribes Dkk3, whose protein then suppresses Th1 IFN-γ via Lef1 downregulation; and in HNSCC it paradoxically acts as an oncogene through PI3K/Akt signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DKK3 (REIC) is a secreted, N-glycosylated Dickkopf-family glycoprotein that functions as a context-dependent regulator of cell survival, differentiation, and Wnt/TGF-\\u03b2 signaling, acting predominantly as a tumor suppressor whose expression is lost in immortalized and tumor-derived cells [#1, #2]. In cancer cells, restoring DKK3 triggers endoplasmic reticulum stress and JNK-dependent apoptosis, with mitochondrial Bax translocation and Bcl-2 loss, selectively in malignant but not normal cells [#0, #4]; an N-terminal region is sufficient to drive ER stress and apoptosis [#13], while the chaperones Hsp70/72 and ER-resident BiP/GRP78 set the threshold for this killing, with low levels conferring sensitivity [#11, #12]. Downstream, ER-stress-induced ATF3 cooperates with Smad to repress Id-1 and activate JNK [#4]. DKK3 restrains Wnt/\\u03b2-catenin signaling through multiple routes: blocking \\u03b2-catenin nuclear accumulation and TCF-4 target genes c-Myc and cyclin D1 [#3], direct \\u03b2-catenin binding [#37], and an intracellular isoform Dkk3b that sequesters cytoplasmic \\u03b2-catenin with \\u03b2-TrCP [#31]. It also suppresses TGF-\\u03b2/Smad signaling by reducing TGF-\\u03b2 receptor levels and Smad2/3 phosphorylation [#20, #21]. Beyond cancer, DKK3 controls differentiation and tissue homeostasis: it drives monocyte-to-dendritic-cell differentiation and STAT/GSK-3\\u03b2 phosphorylation via its cysteine-rich C-terminal domain [#7, #19], binds and inhibits ASK1 to block P38/JNK signaling in hepatocytes and improve insulin sensitivity [#14], promotes smooth-muscle differentiation of vascular progenitors via TGF-\\u03b2/ATF6 and Wnt [#15], and acts as a paracrine inhibitor of muscle stem cell differentiation by enhancing nuclear \\u03b2-catenin\\u2013FoxO3 transcription of the atrogenes Fbxo32 and Trim63 [#16]. Its transcription is controlled by activators (Pax6, FoxO4) and repressors (PRMT5-mediated histone methylation, MYC-miR-92a, Baf60c-Six4) [#32, #27, #26, #33, #29]. In HNSCC, DKK3 paradoxically acts as an oncogene through PI3K/Akt signaling independent of Wnt/TCF [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing DKK3 as a Dickkopf-family secreted protein lost in transformed cells framed it as a candidate tumor suppressor.\",\n      \"evidence\": \"cDNA cloning, sequence/structural analysis, and Northern expression profiling across normal vs immortalized/tumor cell lines\",\n      \"pmids\": [\"10652205\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism for the growth/expression difference defined\", \"Secretion and processing not yet biochemically resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Biochemical characterization showed DKK3 exists as cytosolic and secreted N-glycosylated isoforms and that ectopic expression suppresses tumor growth, linking the protein to growth control.\",\n      \"evidence\": \"Western blot, glycosylation analysis, colony formation, and xenograft assays\",\n      \"pmids\": [\"15516983\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Apoptotic mechanism unresolved\", \"Relationship between isoforms and function unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defining that DKK3 re-expression kills cancer cells via JNK and mitochondrial apoptosis, selectively sparing normal cells, established its therapeutic tumor-suppressor mechanism.\",\n      \"evidence\": \"Adenoviral overexpression, JNK and apoptosis assays, Bax/Bcl-2 readouts, xenograft in prostate cancer\",\n      \"pmids\": [\"16266978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream trigger of JNK not yet identified\", \"Basis of cancer-cell selectivity unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying ER stress as the upstream trigger and the ATF3/Smad-Id-1-JNK axis, plus N-terminal sufficiency, connected DKK3 expression to a defined pro-apoptotic cascade.\",\n      \"evidence\": \"Adenoviral overexpression, Id-1 promoter mutagenesis/reporter assays, truncation mutants, ER stress reporters, orthotopic and in vivo delivery models\",\n      \"pmids\": [\"18922905\", \"18727918\", \"18654608\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How intracellular DKK3 initiates ER stress mechanistically unresolved\", \"Receptor for the apoptotic signal not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying Hsp70/72 and BiP/GRP78 as determinants of sensitivity explained the cancer-selective and resistance phenotypes of DKK3-induced apoptosis.\",\n      \"evidence\": \"Pharmacological induction/inhibition of Hsp70/72, isolation of resistant clones, BiP siRNA knockdown, xenograft validation\",\n      \"pmids\": [\"17549386\", \"19626590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular interaction of DKK3 with these chaperones not shown\", \"Single-lab pharmacology\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showing DKK3 inhibits Wnt/\\u03b2-catenin signaling via reciprocal gain/loss-of-function clarified a second, non-apoptotic tumor-suppressive arm.\",\n      \"evidence\": \"Ectopic expression and siRNA, TCF/LEF reporter, nuclear fractionation in lung cancer\",\n      \"pmids\": [\"18048388\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of \\u03b2-catenin inhibition not yet defined in this context\", \"Extracellular vs intracellular site of action unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Subcellular localization, Tctex-1 interaction, and demonstration that some cancers use JNK-only (not Wnt) apoptosis revealed context-dependence and a dynein-linked ER association.\",\n      \"evidence\": \"Confocal microscopy, yeast/mammalian two-hybrid with domain mapping, JNK inhibitors and cell-cycle/epigenetic analysis in RCC\",\n      \"pmids\": [\"21042718\", \"21835165\", \"21268126\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of Tctex-1 interaction untested\", \"Determinants of Wnt-dependent vs JNK-only response unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapping immune and angiogenic functions to specific DKK3 domains/partners established roles beyond cancer-cell-intrinsic apoptosis.\",\n      \"evidence\": \"C17-REIC recombinant domain protein with monocyte differentiation and STAT/GSK-3\\u03b2 readouts; Co-IP of DKK3-\\u03b22-microglobulin with VEGFR-2/Akt/mTOR readouts\",\n      \"pmids\": [\"25823913\", \"26278164\", \"19212670\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-surface receptor for DKK3 immune signaling not identified\", \"\\u03b22M interaction not reciprocally validated structurally\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Co-IP and ASK1 epistasis defined a direct DKK3-ASK1 interaction that inhibits P38/JNK in metabolic tissue, expanding DKK3 to a physiological signaling regulator.\",\n      \"evidence\": \"Co-immunoprecipitation, hepatocyte-specific KO/overexpression, dominant-negative and constitutively active ASK1 epistasis, metabolic phenotyping\",\n      \"pmids\": [\"27016281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ASK1 binding underlies the cancer apoptosis JNK axis untested\", \"Direct binding interface not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying nuclear \\u03b2-catenin/FoxO3-driven atrogene transcription, endogenous CRISPR-activation suppressing TGF-\\u03b2/Smad, and the Dkk3b/\\u03b2-TrCP sequestering isoform resolved distinct mechanisms by which DKK3 acts on \\u03b2-catenin and TGF-\\u03b2.\",\n      \"evidence\": \"Co-IP (\\u03b2-catenin/FoxO3, Dkk3b/\\u03b2-catenin/\\u03b2-TrCP), reporter assays, transgenic/KO mice, CRISPR-dCas9-VPR endogenous activation\",\n      \"pmids\": [\"29717119\", \"29843383\", \"28738084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a secreted protein gains nuclear/cytoplasmic \\u03b2-catenin access unresolved\", \"Receptor mediating TGF-\\u03b2 suppression unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic and pharmacological studies established DKK3 as a driver of vascular/cardiac differentiation and a tissue-protective TGF-\\u03b2/Wnt regulator, and uncovered an oncogenic PI3K/Akt mode in HNSCC.\",\n      \"evidence\": \"DKK3-/- atherosclerosis and AngII cardiac models, keloid fibroblast TGF-\\u03b2R inhibition, PI3K inhibitor in HNSCC xenografts\",\n      \"pmids\": [\"29284609\", \"29196099\", \"28458155\", \"28470144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why DKK3 switches between tumor-suppressor and oncogene contexts unknown\", \"Receptor identity across these contexts undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defining transcriptional regulators (Pax6, FoxO4 activators; PRMT5, MYC-miR-92a, Baf60c-Six4 repressors) and immune/regeneration outputs placed DKK3 in defined gene-regulatory and paracrine circuits.\",\n      \"evidence\": \"ChIP/ChIP-seq, EMSA, promoter mutagenesis, Co-IP, conditional KO mice, organoids, and rescue/infection models\",\n      \"pmids\": [\"25029272\", \"36106640\", \"33462997\", \"34593610\", \"37284884\", \"34306986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How upstream regulation integrates to set context-specific DKK3 function unclear\", \"Receptor-level mechanism for paracrine immune/muscle effects undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showing DKK3 can also activate Wnt/\\u03b2-catenin to drive MFF transcription and renal fibrosis demonstrated that DKK3 outputs on \\u03b2-catenin are bidirectional and context-determined.\",\n      \"evidence\": \"ChIP, MeRIP/RIP, dual-luciferase, siRNA knockdown, UUO mouse model\",\n      \"pmids\": [\"38682264\", \"35659360\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of Wnt activation vs inhibition by DKK3 unresolved\", \"Single-lab disease-model evidence\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The cell-surface receptor(s) and unifying molecular logic governing whether DKK3 acts as a tumor suppressor, oncogene, or differentiation factor remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No definitive signaling receptor identified for secreted DKK3\", \"No structural model reconciling intracellular ER/ASK1 actions with secreted paracrine effects\", \"Context determinants of opposing Wnt and apoptotic outputs unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 30, 31, 37]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 2, 7, 8]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [8, 9, 4]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 14, 18, 31]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 6, 13]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 16, 23, 37]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 19, 27]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ASK1\", \"CTNNB1\", \"FoxO3\", \"Tctex-1\", \"B2M\", \"BTRC\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}