{"gene":"CCN1","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1990,"finding":"CYR61/CCN1 encodes a 379-amino-acid cysteine-rich polypeptide with an N-terminal secretory signal sequence; its mRNA is induced by serum/PDGF as an immediate-early gene through both protein kinase C-dependent and -independent pathways, accumulates from G0/G1 transition through mid-G1, and the protein has a short intracellular half-life.","method":"Northern blot, immunoprecipitation, cell cycle analysis, pharmacological pathway inhibition","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Northern blot, immunoprecipitation, PKC inhibitors) in a single lab establishing basic biochemical properties","pmids":["2355916"],"is_preprint":false},{"year":1997,"finding":"CYR61/CCN1 is an extracellular matrix-associated signaling molecule; it binds heparin with higher affinity than FISP12/CTGF, associates strongly with the ECM (not secreted freely into medium), is internalized and degraded via the lysosomal pathway after interacting with cell surface receptors, and promotes cell proliferation, migration, and adhesion in fibroblasts, endothelial, and epithelial cells.","method":"Protein purification, heparin-binding assay, cell adhesion/migration/proliferation assays, lysosomal inhibitor experiments, immunohistochemistry","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — purified recombinant protein tested in multiple cell types with orthogonal biochemical assays; multiple functional readouts","pmids":["9184077"],"is_preprint":false},{"year":2002,"finding":"Genetic deletion of Cyr61 in mice causes embryonic lethality due to failure of chorioallantoic fusion and placental vascular insufficiency; CCN1 is required for vessel bifurcation (non-sprouting angiogenesis) at the chorioallantoic junction and regulates Vegf-C expression in allantoic mesoderm.","method":"Gene knockout mouse, histology, immunohistochemistry, molecular analysis of Vegf-C expression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — definitive loss-of-function mouse genetics with specific vascular phenotype and molecular correlate","pmids":["12446788"],"is_preprint":false},{"year":2003,"finding":"Xenopus Cyr61 is required for normal gastrulation movements; it acts through its adhesive properties to modulate extracellular matrix assembly and can stimulate or inhibit Wnt pathway signaling in a context-dependent manner.","method":"Gain- and loss-of-function experiments in Xenopus laevis embryos, extracellular matrix assembly assays, Wnt pathway reporter assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal readouts (gastrulation movements, ECM assembly, Wnt signaling) in a well-established vertebrate model","pmids":["12702657"],"is_preprint":false},{"year":2005,"finding":"CCN1/CYR61 induces apoptosis in fibroblasts (but not endothelial cells) upon cell adhesion through integrin α6β1 and the heparan sulfate proteoglycan syndecan-4; this triggers transcription-independent p53 activation of Bax, cytochrome c release, and activation of caspase-9 and caspase-3, without requiring caspase-8 or de novo transcription/translation.","method":"Cell adhesion assay, integrin-blocking antibodies, siRNA knockdown of receptors, caspase activity assays, cytochrome c release, p53 activation assays, co-immunoprecipitation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (receptor blocking, siRNA, caspase assays, Bax activation) in a single rigorous study defining the apoptotic mechanism","pmids":["16275757"],"is_preprint":false},{"year":2010,"finding":"CCN1 induces fibroblast senescence by binding to integrin α6β1 and heparan sulfate proteoglycans, activating DNA damage response pathways and p53, and stimulating the RAC1-NOX1 complex to generate ROS; this leads to ROS-dependent activation of the p16INK4a/pRb pathway, causing senescence and antifibrotic gene expression. Knockin mice expressing a senescence-defective CCN1 mutant develop exacerbated fibrosis.","method":"Knockin mouse model, integrin-blocking antibodies, ROS measurement, RAC1-NOX1 complex analysis, p53/p16/pRb pathway analysis, gene expression profiling, topical protein application","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo genetic model plus multiple orthogonal mechanistic assays (integrin binding, ROS, RAC1-NOX1, p53, p16/pRb) establishing a complete signaling pathway","pmids":["20526329"],"is_preprint":false},{"year":2010,"finding":"CCN1 supports macrophage adhesion through integrin αMβ2 and syndecan-4, directly activates NF-κB-mediated transcription, and induces a proinflammatory M1 macrophage genetic program via two mechanisms: an immediate-early NF-κB-dependent cytokine response and a delayed autocrine/paracrine TNF-α-mediated secondary cytokine response.","method":"Macrophage adhesion assay, NF-κB reporter assay, integrin-blocking antibodies, siRNA knockdown of syndecan-4, gene expression profiling, TNF-α neutralization","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal receptor blocking and multiple orthogonal assays establishing two distinct mechanistic pathways","pmids":["20164416"],"is_preprint":false},{"year":2013,"finding":"LPA induces temporal and spatial expression of Cyr61/CCN1, which accumulates in the Golgi apparatus and translocates to the ECM; extracellular Cyr61 bridges LPA receptor 1 (LPA1) signaling to integrin α6β1 and αvβ3, which activate focal adhesion kinase (FAK), driving smooth muscle cell migration. LPA1 knockout cells lack Cyr61 induction and migration.","method":"siRNA knockdown, antibody blockade, LPA receptor knockout cells, subcellular fractionation/immunofluorescence, FAK phosphorylation assay, cell migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic (LPA1 KO) and pharmacological (siRNA, antibody) approaches with subcellular localization and FAK activation establishing a complete signaling axis","pmids":["24371135"],"is_preprint":false},{"year":2014,"finding":"CCN1 in cardiomyocytes is induced by RhoA activation downstream of GPCR agonists (S1P, LPA, endothelin-1) through MRTF-A (MKL1)/SRF signaling; secreted CCN1 binds back to cardiomyocytes in an autocrine fashion and protects against ischemia/reperfusion injury. Cardiac-specific CCN1 KO mice show increased infarct size after I/R.","method":"RhoA inhibition (C3 exoenzyme, pharmacological), MRTF-A knockdown/inhibitors, siRNA knockdown of CCN1, simulated ischemia/reperfusion in NRVMs, cardiac-specific CCN1 KO mouse model, infarct size measurement","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological approaches in vitro combined with in vivo KO mouse model establishing the RhoA/MRTF-A/CCN1 cardioprotection axis","pmids":["25106095"],"is_preprint":false},{"year":2015,"finding":"CCN1 acts as a bridging molecule in neutrophil efferocytosis by binding phosphatidylserine on apoptotic neutrophils and integrins αvβ3/αvβ5 on macrophages; knockin mice with a CCN1 mutant unable to bind αvβ3/αvβ5 or Ccn1 knockdown mice exhibit defective neutrophil clearance, exuberant neutrophil accumulation, and delayed wound healing.","method":"Phosphatidylserine binding assay, integrin-binding assays, knockin mouse model, Ccn1 knockdown mice, efferocytosis assays, wound healing analysis in diabetic Lepr(db/db) mice","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple complementary genetic models (knockin, knockdown) with defined molecular binding interactions and specific cellular phenotype","pmids":["26077348"],"is_preprint":false},{"year":2015,"finding":"CCN1 promotes mucosal healing in colitis by inducing IL-6 expression through integrin αMβ2 in macrophages and integrin α6β1 in fibroblasts; IL-6 in turn stimulates intestinal epithelial cell proliferation. Ccn1(dm/dm) knockin mice (αMβ2/α6β1-binding defective) show impaired healing and reduced IL-6 during DSS colitis recovery.","method":"Knockin mouse model (Ccn1 dm/dm), DSS colitis model, integrin-blocking antibodies, CCN1 protein administration, IL-6 delivery rescue, IEC proliferation assay","journal":"Mucosal immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockin plus receptor-blocking and rescue experiments establishing integrin-specific IL-6 induction pathway","pmids":["25807183"],"is_preprint":false},{"year":2015,"finding":"CCN1 suppresses hepatocarcinogenesis by inhibiting EGFR-dependent compensatory hepatocyte proliferation through integrin α6-mediated ROS accumulation, leading to p53 activation and cell cycle block. Ccn1ΔHep and Ccn1(dm/dm) mice show increased DEN-induced HCC due to diminished p53 activation and elevated compensatory proliferation.","method":"Hepatocyte-specific Ccn1 KO mice, knockin mice (α6β1-binding defective), DEN-induced HCC model, ROS measurement, EGFR inhibitor (erlotinib) treatment, p53 activation assay, proliferation assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — two complementary genetic mouse models with detailed mechanistic pathway dissection (integrin α6→ROS→p53) and pharmacological validation","pmids":["26028023"],"is_preprint":false},{"year":2015,"finding":"CCN1 is O-fucosylated at Thr242 in its thrombospondin type-1 repeat (TSR1) domain by protein O-fucosyltransferase 2 (POFUT2); loss of O-fucosylation reduces cell-surface localization and secretion of CCN1.","method":"Mass spectrometry identification of O-fucosylation site, mutagenesis of Thr242, POFUT2 knockdown, measurement of secreted and cell-surface CCN1","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mass spectrometry identification combined with mutagenesis and knockdown establishing a specific post-translational modification required for secretion","pmids":["26424659"],"is_preprint":false},{"year":2015,"finding":"CCN1 binds directly to ADAMTS-4 (aggrecanase-1) through the ADAMTS-4 cysteine-rich domain and inhibits its aggrecanase activity; TGF-β-induced CCN1 expression is sufficient to block ADAMTS-4 aggrecanase activity in chondrocytes, while IL-1α stimulation that downregulates CCN1 allows ADAMTS-4 activity.","method":"Nanoscale LC-MS/MS identification, co-immunoprecipitation, solid-phase binding assay, aggrecan digestion assay, siRNA knockdown of CCN1, IL-1α/TGFβ treatment","journal":"Arthritis & rheumatology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — MS identification of binding partner confirmed by pulldown and solid-phase assay, with enzymatic activity readout and genetic manipulation","pmids":["25709087"],"is_preprint":false},{"year":2016,"finding":"CCN1/CYR61 released by activated platelets enables the recruitment of Ly6Clow monocytes to inflamed vascular endothelium; endothelium-bound CCN1 sustains Ly6Clow monocyte patrolling and orchestrates subsequent neutrophil recruitment. Antibody blockade of CCN1 impaired early Ly6Clow monocyte arrival and abolished neutrophil recruitment.","method":"Confocal intravital microscopy, CCN1-blocking antibodies, platelet depletion, TLR7/8-mediated inflammation model in mesenteric veins","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct in vivo imaging with specific antibody blockade establishing CCN1 as a molecular mediator of monocyte recruitment","pmids":["27482114"],"is_preprint":false},{"year":2018,"finding":"CCN1/CYR61 regulates sclerostin (Sost) expression in osteocytes/osteoblasts; CCN1 overexpression suppresses Sost, and Sost siRNA rescues Wnt responsiveness in Ccn1 knockout cells. Bone-specific Ccn1 KO mice show decreased bone mass with increased Sost, increased RankL, decreased VegfA, and impaired Wnt signaling.","method":"Conditional bone-specific KO mice, microCT bone analysis, in vitro overexpression/siRNA in UMR-106 cells, Axin2 reporter of Wnt signaling, bone vasculature analysis","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model combined with in vitro rescue experiments establishing CCN1→Sost→Wnt axis","pmids":["29351359"],"is_preprint":false},{"year":2019,"finding":"Shear stress-induced CCN1 binds integrin α6β1 on endothelial cells to activate NF-κB, inducing atheroprone gene expression and establishing a positive feedback loop where NF-κB further increases CCN1 and α6β1 expression. Ccn1-dm/Apoe-/- knockin mice show marked resistance to ligation-induced atherosclerotic plaque formation.","method":"Knockin mouse model (Ccn1-dm/dm; Apoe-/-), carotid artery ligation atherosclerosis model, oscillatory vs. laminar shear stress experiments in ECs, NF-κB reporter assay, integrin-blocking peptide (T1)","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model combined with in vitro mechanistic experiments establishing CCN1/α6β1/NF-κB positive feedback loop with therapeutic peptide validation","pmids":["30917686"],"is_preprint":false},{"year":2019,"finding":"CCN1 is a direct target of YAP transcriptional coactivator in endothelial cells; CCN1 overexpression causes nuclear exclusion/inactivation of YAP in a negative feedback loop by providing cells with a soft compliant matrix that creates YAP-repressive cytoskeletal states. EC-specific Ccn1 deletion phenocopies YAP gain-of-function with EC hyperproliferation and vessel enlargement.","method":"YAP ChIP on CCN1 promoter, EC-specific Ccn1 KO mice, AAV-mediated CCN1 expression in ischemic retinopathy, YAP nuclear localization assays, pharmacological modulation of cell stiffness","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP establishing direct genomic targeting, EC-specific KO mouse, in vivo rescue experiment, and mechanistic explanation via matrix compliance","pmids":["31262999"],"is_preprint":false},{"year":2019,"finding":"CCN1 activates VEGFR2 and downstream MAPK/PI3K signaling and YAP/TAZ as well as Rho effector mDia1 to enhance endothelial tip cell activity; VEGFR2 interacts with integrin αvβ3 through CCN1, forming a complex that promotes CCN1 expression in a positive feedback loop.","method":"Zebrafish ccn1 knockdown, EC-specific Ccn1 transgenic mice, retinal vascular sprouting assay, integrin αvβ3 inhibitor, co-immunoprecipitation of VEGFR2/integrin αvβ3, YAP/TAZ activation assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (zebrafish KD, transgenic mice) with receptor co-IP and signaling pathway analysis","pmids":["31429823"],"is_preprint":false},{"year":2020,"finding":"CCN1 binds bacterial pathogen-associated molecular patterns (peptidoglycans of Gram-positive bacteria and LPS of Gram-negative bacteria), opsonizes MRSA and Pseudomonas aeruginosa for phagocytosis through integrin αvβ3, and directly binds TLR2 and TLR4 to activate MyD88-dependent signaling, cytokine expression, and neutrophil mobilization.","method":"Binding assays (peptidoglycan/LPS), phagocytosis assays, ROS production assays, myeloid-specific Ccn1 KO mice, αvβ3-binding knockin mice, in vivo infection models, TLR2/TLR4 direct binding assays, MyD88-dependent signaling analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding assays for PAMPs and TLRs combined with multiple genetic mouse models and in vivo infection outcomes","pmids":["32144270"],"is_preprint":false},{"year":2022,"finding":"CCN1 coordinately regulates intestinal stem cell (ISC) proliferation and differentiation through integrins αvβ3/αvβ5: CCN1 induces NF-κB-dependent Jag1 expression to activate Notch signaling for differentiation, and promotes Src-mediated YAP activation and Dkk1 expression to control Wnt signaling for proliferation; CCN1 and YAP amplify each other's activities in a regulatory loop.","method":"Ccn1 deletion in Lgr5+ ISCs, knockin mice (αvβ3/αvβ5-binding defective CCN1), crypt organoids, NF-κB reporter, Notch pathway analysis, YAP activation assay, Wnt reporter, intestinal phenotype analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — two complementary genetic mouse models with organoid mechanistic studies establishing two distinct integrin-dependent pathways","pmids":["35660741"],"is_preprint":false},{"year":2023,"finding":"Hepatocyte CCN1 polarizes infiltrating monocytes to a proinflammatory/profibrotic phenotype in NASH through an IRAK4/SYK/NF-κB signaling cascade, inducing PDGFa/PDGFb expression in macrophages; liver-specific CCN1 KO mice show improved glucose tolerance, decreased liver inflammation, and reduced fibrosis on NASH diet.","method":"Liver-specific CCN1 KO mice, NASH diet model, in vitro macrophage treatment with CCN1, IRAK4/SYK inhibitors, NF-κB reporter, targeted antibody blockade in vitro and in vivo","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse combined with in vitro mechanistic dissection (IRAK4/SYK/NF-κB) and antibody therapeutic validation","pmids":["37756381"],"is_preprint":false},{"year":2025,"finding":"Upon ferroptosis induction, CCN1 relocates from extracellular matrix to mitochondrial complexes where it facilitates ETFA-dependent fatty acid β-oxidation, providing additional substrates for mitochondrial ROS production and stimulating ferroptosis through lipid peroxidation. This CCN1-ETFA pathway is distinct from the canonical CPT2-ETFA pathway.","method":"Multiomics screening, subcellular fractionation/co-immunoprecipitation of CCN1 with mitochondrial complexes, fatty acid β-oxidation assays, ROS measurement, lipid peroxidation assays, CCN1 KO cells and mouse models, high-fat diet lung cancer models","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiomics identification with biochemical validation of mitochondrial complex interaction, functional assays, and in vivo genetic models","pmids":["40280135"],"is_preprint":false},{"year":2005,"finding":"Cyr61/CCN1 protects pulmonary epithelial cells against hyperoxia-induced cell death via Akt activation; siRNA-mediated knockdown of Cyr61 accelerated cell death, while overexpression conferred resistance and induced Akt phosphorylation; siRNA knockdown of Akt abrogated the protective effect.","method":"siRNA knockdown of Cyr61 and Akt, Cyr61 overexpression, Akt phosphorylation assay, cell death assays under hyperoxia","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with specific epistasis (Akt siRNA rescues Cyr61 effect), single lab","pmids":["15961723"],"is_preprint":false},{"year":2008,"finding":"Caveolin-1 (cav-1) co-localizes and physically interacts with Cyr61 via integrins in bronchial epithelial cells; deletion of cav-1 increases extracellular Cyr61 secretion (by a non-classical, Brefeldin A-inhibitable pathway) and decreases cytosolic Cyr61; the protective effect of cav-1 deletion against hyperoxia requires secreted Cyr61.","method":"Co-immunoprecipitation, co-localization by immunofluorescence, cav-1 knockout cells/mice, neutralizing antibody, Brefeldin A treatment, subcellular fractionation","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and functional validation with genetic KO, single lab with multiple orthogonal methods","pmids":["18801924"],"is_preprint":false},{"year":2014,"finding":"Full-length CCN1 is secreted in an exosome-shuttled manner; extracellular plasmin cleaves full-length CCN1 to generate a C-terminal fragment (cCCN1) that binds integrin-α7 and promotes MMP-1 production, while full-length CCN1 facilitates IL-8 and VEGF release; the two forms have opposing functions in cigarette smoke-induced lung epithelial injury.","method":"Exosome isolation, plasmin cleavage assay, integrin-α7 binding/expression analysis, siRNA knockdown, MMP-1 and VEGF/IL-8 measurement, bronchoalveolar lavage analysis in vivo","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical cleavage assay with receptor identification and functional consequences, single lab","pmids":["24973403"],"is_preprint":false},{"year":2009,"finding":"CCN1 supports prostate carcinoma cell adhesion through integrins and heparan sulfate proteoglycans, promotes cell proliferation, and enhances TRAIL-induced apoptosis through integrins αvβ3 and α6β4 and syndecan-4 via a PKCα-dependent mechanism not requiring de novo protein synthesis.","method":"Integrin-blocking antibodies, syndecan-4 knockdown, CCN1 siRNA knockdown, TRAIL apoptosis assays, PKCα inhibitors, CCN1 protein rescue","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor blocking and siRNA approaches with specific kinase inhibition establishing mechanistic dichotomy, single lab","pmids":["19584265"],"is_preprint":false},{"year":2016,"finding":"CCN1 promotes chondrocyte maturation and cartilage development downstream of WNT/β-catenin signaling; β-catenin promotes CCN1 expression in chondrocytes, and cartilage-specific CCN1 overexpression in transgenic mice leads to chondrodysplasia and cartilage degeneration.","method":"Primary chondrocyte cultures, β-catenin gain/loss-of-function, conditional CCN1 transgenic mice, in vitro chondrocyte maturation assays with CCN1 overexpression/inhibition","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic studies combined with transgenic mouse model, single lab","pmids":["26363286"],"is_preprint":false},{"year":2018,"finding":"CCN1 activates melanogenesis in human epidermal melanocytes through integrin α6β1, and downstream p38 MAPK and ERK1/2 signaling, upregulating MITF, TRP-1, and tyrosinase and promoting melanosome maturation; UVB irradiation stimulates CCN1 secretion from dermal fibroblasts, and CCN1 knockdown in fibroblasts attenuates melanogenesis in co-culture.","method":"Recombinant CCN1 treatment, integrin α6β1 blocking antibodies, p38/ERK inhibitors, siRNA knockdown of CCN1 in fibroblasts, melanocyte-fibroblast co-culture, tyrosinase activity assay","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor blocking and kinase inhibition establishing signaling pathway, paracrine mechanism validated in co-culture, single lab","pmids":["29510193"],"is_preprint":false},{"year":2020,"finding":"IL-6 stimulates Cyr61 protein synthesis in fibroblast-like synoviocytes via the ERK1/2-EGR3 pathway; Cyr61 promotes FLS migration and invasion in an autocrine manner by upregulating MMP2; knockdown or neutralizing antibody to Cyr61 attenuates IL-6-induced FLS migration.","method":"Western blot, siRNA knockdown of EGR3 and JUN, ERK1/2 inhibitor (PD98059), CYR61 neutralizing antibody, wound healing assay, Boyden chamber invasion assay, MMP2 expression analysis","journal":"Arthritis research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic dissection of IL-6/ERK/EGR3/Cyr61/MMP2 axis, single lab","pmids":["33228785"],"is_preprint":false},{"year":2019,"finding":"CCN1 expression in fibroblasts is required for bleomycin-induced skin fibrosis; fibroblast-specific CCN1 deletion reduces type I collagen stability (via reduced prolyl-4-hydroxylase and PLOD2 expression) and leads to disorganized collagen fibers, while not affecting myofibroblast induction or wound closure kinetics.","method":"Fibroblast-specific CCN1 KO mice, bleomycin-induced fibrosis model, electron microscopy of collagen fibers, hydroxyproline assay, qPCR for collagen stability enzymes, wound healing assay","journal":"Matrix biology plus","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO mouse with distinct phenotype separating fibrosis from wound healing and identifying collagen stability as the mechanism, single lab","pmids":["33543008"],"is_preprint":false},{"year":2024,"finding":"TGF-β-stimulated Smad2/3 and Hippo pathway effectors YAP and TEAD4 form a protein complex on the CYR61 promoter to cooperatively activate CYR61 transcription; CYR61 functions as a tumor suppressor in liver cancer cells, impeding TGF-β- or YAP-induced malignant transformation.","method":"ChIP assay on CYR61 promoter, co-immunoprecipitation of Smad2/3-YAP-TEAD4 complex, CYR61 overexpression/depletion, HCC xenograft mouse model, transcriptomic analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and co-IP establishing transcriptional complex with functional in vitro and in vivo validation, single lab","pmids":["38521502"],"is_preprint":false},{"year":2017,"finding":"CCN1 induces CCL20 production in keratinocytes via activation of p38 MAPK and JNK pathways, which enhance AP-1 binding to the CCL20 promoter; in vivo, CCN1 blockade or knockdown reduces CCL20 expression and ameliorates psoriasis-like inflammation in mouse models.","method":"Exogenous CCN1 protein treatment of keratinocytes, p38/JNK inhibitors, ChIP assay for AP-1 on CCL20 promoter, siRNA knockdown of CCN1, imiquimod and IL-23 psoriasis mouse models","journal":"Journal of dermatological science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus pharmacological inhibition with in vivo validation in two mouse models, single lab","pmids":["28602508"],"is_preprint":false},{"year":2022,"finding":"3-Mercaptopyruvate sulfurtransferase (3-MST) upregulates CYR61 expression via modulation of S1PR through ATF1 and CREB; endogenously produced CYR61 counteracts apoptosis in part through RhoA activation; inhibition of 3-MST markedly suppresses CYR61 secretion from colon cancer cells.","method":"Pharmacological inhibitors of CBS and 3-MST, H2S/polysulfide donors, CYR61 promoter luciferase assay, siRNA knockdown, RhoA activation assay, apoptosis assays","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter assay combined with siRNA and pharmacological dissection establishing 3-MST/ATF1/CREB/CYR61/RhoA axis, single lab","pmids":["36113340"],"is_preprint":false},{"year":2024,"finding":"Endogenous CCN1 from fibroblasts is required for collagen fibril organization and scar structural integrity after myocardial infarction; fibroblast-specific CCN1 KO mice show disorganized collagen topography, reduced fibroblast-matrix interactions, and increased cardiac rupture after MI without affecting myofibroblast induction or total collagen mass; CCN1 augments fibroblast focal adhesion formation.","method":"Fibroblast-specific CCN1 KO mice, MI (coronary ligation) model, SHG and TEM collagen architecture analysis, focal adhesion assay, in vitro CCN1 siRNA, cardiac function analysis","journal":"Matrix biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO mouse with detailed ultrastructural collagen analysis, specific in vivo phenotype, single lab","pmids":["39098433"],"is_preprint":false},{"year":2015,"finding":"CCN1/CYR61 overexpression in hepatic stellate cells induces ER stress by overloading the endoplasmic reticulum, triggering an unfolded protein response (UPR) including IRE1α-JNK, PERK-eIF2a-CHOP activation, and apoptosis via caspase-12, -9, and -3 cleavage; this reduces type I collagen expression.","method":"Adenoviral CCN1 overexpression in primary HSC and HSC lines, UPR markers (BIP/GRP78, GRP94, spliced XBP1, CHOP), caspase cleavage assays, TUNEL staining, collagen mRNA/protein measurement","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal ER stress and apoptosis markers in primary cells, single lab","pmids":["26515130"],"is_preprint":false},{"year":2003,"finding":"In glomerulonephritis, CCN1 expressed by podocytes can inhibit mesangial cell migration; recombinant CCN1 enhanced endothelial cell adhesion while prominently inhibiting mesangial cell adhesion, and induced p27Kip1 and synaptopodin expression in cultured podocytes, suppressing podocyte migration.","method":"Recombinant CCN1 treatment, cell adhesion assay, cell migration assay, Western blot for p27Kip1 and synaptopodin, in situ hybridization, immunohistochemistry","journal":"American journal of physiology. Renal physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — recombinant protein functional assays in multiple cell types with specific molecular readouts, single lab","pmids":["17699553"],"is_preprint":false}],"current_model":"CCN1/CYR61 is a secreted, ECM-associated matricellular protein that functions as a multi-integrin ligand: it drives diverse and sometimes opposing cellular responses depending on cell type and receptor context—promoting survival/angiogenesis through αvβ3/αvβ5, inducing apoptosis and senescence through α6β1/syndecan-4 (via RAC1-NOX1 ROS and p53/p16INK4a pathways), activating NF-κB-mediated proinflammatory programs in macrophages through αMβ2/syndecan-4, mediating neutrophil efferocytosis as a bridging opsonin for phosphatidylserine and αvβ3/αvβ5, acting as a pattern recognition receptor that directly binds TLR2/TLR4 to activate MyD88-dependent signaling, relocating to mitochondria during ferroptosis to facilitate ETFA-dependent fatty acid β-oxidation, and coordinating intestinal stem cell homeostasis through integrin αvβ3/αvβ5-driven NF-κB/Notch and Src/YAP/Wnt pathways; its secretion requires O-fucosylation at Thr242 by POFUT2, and its expression is transcriptionally controlled by RhoA/MRTF-A, YAP/TEAD, and TGF-β/Smad signaling."},"narrative":{"mechanistic_narrative":"CCN1 (CYR61) is a secreted, heparin- and ECM-associated matricellular protein, first identified as a serum/PDGF-inducible immediate-early gene product that associates strongly with the extracellular matrix rather than diffusing freely, and is internalized and degraded via the lysosome [PMID:2355916, PMID:9184077]. It functions principally as a multivalent integrin ligand whose biological output is dictated by the receptor and cell-type context. Through αvβ3/αvβ5 it supports survival, adhesion, and angiogenesis—its genetic deletion causes embryonic lethality from failed chorioallantoic fusion and placental vascular insufficiency [PMID:12446788], and it amplifies endothelial tip-cell activity by coupling VEGFR2 to αvβ3 [PMID:31429823]. Through integrin α6β1 together with the heparan sulfate proteoglycan syndecan-4, CCN1 instead drives transcription-independent p53-dependent apoptosis in fibroblasts [PMID:16275757] and RAC1-NOX1 ROS-dependent senescence via the p16INK4a/pRb pathway, with a senescence-defective knockin allele producing exacerbated fibrosis [PMID:20526329]. In innate immunity, CCN1 engages αMβ2/syndecan-4 on macrophages to directly activate NF-κB and a proinflammatory program [PMID:20164416], serves as a phosphatidylserine-bridging opsonin for neutrophil efferocytosis via αvβ3/αvβ5 [PMID:26077348], and acts as a pattern-recognition molecule binding bacterial PAMPs and directly engaging TLR2/TLR4 to trigger MyD88-dependent signaling [PMID:32144270]. CCN1 expression is itself an integrating node of mechanotransduction and growth-factor signaling, induced by RhoA/MRTF-A [PMID:25106095], YAP/TEAD [PMID:31262999, PMID:38521502], and TGF-β/Smad [PMID:38521502], and its secretion and cell-surface display require O-fucosylation at Thr242 by POFUT2 [PMID:26424659]. Across intestinal stem cells [PMID:35660741], bone [PMID:29351359], liver [PMID:26028023, PMID:37756381], and vasculature [PMID:30917686], CCN1 coordinates NF-κB/Notch, Src/YAP/Wnt, and integrin-α6β1/NF-κB feedback circuits to balance proliferation, differentiation, inflammation, and tissue repair.","teleology":[{"year":1990,"claim":"Established the molecular identity and regulation of CCN1 as a secreted cysteine-rich immediate-early gene product, framing it as a candidate growth-factor-responsive signaling molecule.","evidence":"Northern blot, immunoprecipitation, cell-cycle and PKC-pathway inhibition in cultured cells","pmids":["2355916"],"confidence":"Medium","gaps":["No receptor or downstream signaling identified","Function of the secreted protein not defined"]},{"year":1997,"claim":"Defined CCN1 as an ECM-associated, heparin-binding ligand acting on cell-surface receptors to promote adhesion, migration, and proliferation, moving it from a transcript to a functional matricellular protein.","evidence":"Purified recombinant protein in heparin-binding, adhesion/migration/proliferation, and lysosomal-degradation assays across multiple cell types","pmids":["9184077"],"confidence":"High","gaps":["Specific receptors not yet identified","Mechanism of cell-type-specific responses unknown"]},{"year":2002,"claim":"Demonstrated an essential, non-redundant in vivo role in vascular development, establishing CCN1 as required for placental angiogenesis and viability.","evidence":"Cyr61 knockout mouse with histology and Vegf-C expression analysis","pmids":["12446788"],"confidence":"High","gaps":["Receptor mediating the angiogenic effect not defined","Relationship between vascular and other functions unclear"]},{"year":2005,"claim":"Resolved how CCN1 can be proapoptotic by identifying α6β1/syndecan-4 engagement that triggers transcription-independent p53/Bax-mediated apoptosis, explaining cell-type-specific opposing outcomes.","evidence":"Receptor-blocking antibodies, siRNA, caspase and cytochrome c assays in fibroblasts versus endothelial cells","pmids":["16275757","15961723"],"confidence":"High","gaps":["How receptor context switches survival versus death not fully resolved","In vivo relevance not yet tested at this stage"]},{"year":2010,"claim":"Connected CCN1 to senescence and inflammation by defining the α6β1-RAC1-NOX1-ROS-p16/pRb senescence axis and the αMβ2/syndecan-4-NF-κB macrophage program, with an in vivo antifibrotic role.","evidence":"Senescence-defective knockin mice, ROS and RAC1-NOX1 assays, macrophage NF-κB reporters and receptor blocking","pmids":["20526329","20164416"],"confidence":"High","gaps":["Structural basis of distinct integrin engagement unresolved","How ROS levels are tuned for senescence versus apoptosis unclear"]},{"year":2013,"claim":"Placed CCN1 within upstream signaling cascades, showing LPA1-induced CCN1 bridges to α6β1/αvβ3-FAK to drive smooth muscle migration and that RhoA/MRTF-A induction yields autocrine cardioprotection.","evidence":"LPA1 knockout cells, RhoA/MRTF-A inhibition, cardiac-specific CCN1 KO and I/R injury models","pmids":["24371135","25106095"],"confidence":"High","gaps":["Tissue-specific determinants of protective versus damaging output unclear"]},{"year":2015,"claim":"Expanded CCN1 into innate immune clearance and biosynthetic regulation: it bridges phosphatidylserine to αvβ3/αvβ5 for efferocytosis, requires POFUT2 O-fucosylation at Thr242 for secretion, and directly inhibits ADAMTS-4 aggrecanase.","evidence":"Knockin/knockdown efferocytosis mice, mass spectrometry plus Thr242 mutagenesis, co-IP and aggrecan digestion assays","pmids":["26077348","26424659","25709087","25807183","26028023"],"confidence":"High","gaps":["Whether O-fucosylation modulates receptor selectivity not tested","Range of direct protein partners beyond ADAMTS-4 unexplored"]},{"year":2019,"claim":"Defined CCN1 as a mechanotransduction node embedded in feedback loops: shear-induced α6β1/NF-κB promotes atherosclerosis, while YAP directly targets CCN1, which in turn restrains YAP through matrix compliance, and CCN1 couples VEGFR2-αvβ3 for sprouting.","evidence":"Knockin atherosclerosis mice, YAP ChIP on CCN1 promoter, EC-specific KO, zebrafish/mouse angiogenesis and VEGFR2 co-IP","pmids":["30917686","31262999","31429823"],"confidence":"High","gaps":["How opposing positive and negative feedback loops are balanced in vivo unclear"]},{"year":2020,"claim":"Established CCN1 as a bona fide pattern-recognition molecule binding bacterial PAMPs and directly engaging TLR2/TLR4 to drive MyD88-dependent antimicrobial responses.","evidence":"PAMP and TLR binding assays, phagocytosis assays, myeloid-specific KO and binding-defective knockin mice in infection models","pmids":["32144270"],"confidence":"High","gaps":["Structural basis of direct TLR binding not defined","Relationship between TLR and integrin engagement unresolved"]},{"year":2022,"claim":"Defined a tissue-homeostatic role in intestinal stem cells, showing CCN1 partitions αvβ3/αvβ5 signaling into NF-κB/Jag1-Notch differentiation and Src/YAP/Wnt proliferation arms in a reciprocal loop with YAP.","evidence":"Lgr5+ ISC Ccn1 deletion, binding-defective knockin mice, crypt organoids with Notch/YAP/Wnt readouts","pmids":["35660741"],"confidence":"High","gaps":["How a single ligand bifurcates into distinct downstream programs mechanistically unclear"]},{"year":2025,"claim":"Revealed an unexpected intracellular function: during ferroptosis CCN1 relocates to mitochondrial complexes to facilitate ETFA-dependent fatty acid β-oxidation, fueling ROS and lipid peroxidation distinct from the canonical CPT2-ETFA route.","evidence":"Multiomics screening, subcellular fractionation/co-IP with mitochondrial complexes, β-oxidation and lipid peroxidation assays, KO cells and mouse models","pmids":["40280135"],"confidence":"High","gaps":["Mechanism of CCN1 trafficking from ECM to mitochondria unknown","How a secreted protein accesses the mitochondrial matrix unresolved"]},{"year":null,"claim":"It remains unresolved how a single matricellular ligand's structural features dictate the choice among integrin/co-receptor partners and thereby switch between survival, apoptosis, senescence, inflammation, and intracellular metabolic roles.","evidence":"Synthesis across context-dependent integrin and receptor studies in the timeline","pmids":[],"confidence":"Medium","gaps":["No structural model of CCN1-receptor complexes","Determinants of cell-type-specific output not defined","Trafficking routes between ECM, surface, and organelles incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,4,5,6,9,18,20]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[4,5,6,16,19]},{"term_id":"GO:0060089","term_label":"molecular transducer 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Appears to play a role in wound healing by up-regulating, in skin fibroblasts, the expression of a number of genes involved in angiogenesis, inflammation and matrix remodeling including VEGA-A, VEGA-C, MMP1, MMP3, TIMP1, uPA, PAI-1 and integrins alpha-3 and alpha-5. CCN1-mediated gene regulation is dependent on heparin-binding. Down-regulates the expression of alpha-1 and alpha-2 subunits of collagen type-1. Promotes cell adhesion and adhesive signaling through integrin alpha-6/beta-1, cell migration through integrin alpha-v/beta-5 and cell proliferation through integrin alpha-v/beta-3","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/O00622/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CCN1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CCN1","total_profiled":1310},"omim":[{"mim_id":"614983","title":"BASIC LEUCINE ZIPPER TRANSCRIPTION FACTOR, ATF-LIKE 2; BATF2","url":"https://www.omim.org/entry/614983"},{"mim_id":"602369","title":"CELLULAR COMMUNICATION NETWORK FACTOR 1; CCN1","url":"https://www.omim.org/entry/602369"},{"mim_id":"123835","title":"CYCLIN A2; CCNA2","url":"https://www.omim.org/entry/123835"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"blood 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pathways leading to cell migration.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24371135","citation_count":24,"is_preprint":false},{"pmid":"22692860","id":"PMC_22692860","title":"The matrix protein CCN1/CYR61 is required for α(V)β5-mediated cancer cell migration.","date":"2012","source":"Cell biochemistry and function","url":"https://pubmed.ncbi.nlm.nih.gov/22692860","citation_count":24,"is_preprint":false},{"pmid":"31262999","id":"PMC_31262999","title":"CCN1-Yes-Associated Protein Feedback Loop Regulates Physiological and Pathological Angiogenesis.","date":"2019","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/31262999","citation_count":23,"is_preprint":false},{"pmid":"25061178","id":"PMC_25061178","title":"CYR61/CCN1 overexpression in the myeloma microenvironment is associated with superior survival and reduced bone 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Expression.","date":"2021","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34458333","citation_count":19,"is_preprint":false},{"pmid":"25187756","id":"PMC_25187756","title":"Inhibiting CCN1 blocks AML cell growth by disrupting the MEK/ERK pathway.","date":"2014","source":"Cancer cell international","url":"https://pubmed.ncbi.nlm.nih.gov/25187756","citation_count":19,"is_preprint":false},{"pmid":"36687680","id":"PMC_36687680","title":"MOTS-c repairs myocardial damage by inhibiting the CCN1/ERK1/2/EGR1 pathway in diabetic rats.","date":"2023","source":"Frontiers in nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/36687680","citation_count":19,"is_preprint":false},{"pmid":"35159343","id":"PMC_35159343","title":"Valproic Acid-Induced CCN1 Promotes Osteogenic Differentiation by Increasing CCN1 Protein Stability through HDAC1 Inhibition in Tonsil-Derived Mesenchymal Stem Cells.","date":"2022","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/35159343","citation_count":17,"is_preprint":false},{"pmid":"34890187","id":"PMC_34890187","title":"Adriamycin-Induced Podocyte Injury Disrupts the YAP-TEAD1 Axis and Downregulates Cyr61 and CTGF Expression.","date":"2021","source":"ACS chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/34890187","citation_count":17,"is_preprint":false},{"pmid":"32800875","id":"PMC_32800875","title":"Dermal Fibroblast CCN1 Expression in Mice Recapitulates Human Skin Dermal Aging.","date":"2020","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/32800875","citation_count":17,"is_preprint":false},{"pmid":"28700567","id":"PMC_28700567","title":"Recombinant CCN1 prevents hyperoxia-induced lung injury in neonatal rats.","date":"2017","source":"Pediatric 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international","url":"https://pubmed.ncbi.nlm.nih.gov/25820828","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":53808,"output_tokens":10194,"usd":0.157167,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":20920,"output_tokens":4482,"usd":0.108325,"stage2_stop_reason":"end_turn"},"total_usd":0.265492,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"CYR61/CCN1 encodes a 379-amino-acid cysteine-rich polypeptide with an N-terminal secretory signal sequence; its mRNA is induced by serum/PDGF as an immediate-early gene through both protein kinase C-dependent and -independent pathways, accumulates from G0/G1 transition through mid-G1, and the protein has a short intracellular half-life.\",\n      \"method\": \"Northern blot, immunoprecipitation, cell cycle analysis, pharmacological pathway inhibition\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Northern blot, immunoprecipitation, PKC inhibitors) in a single lab establishing basic biochemical properties\",\n      \"pmids\": [\"2355916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CYR61/CCN1 is an extracellular matrix-associated signaling molecule; it binds heparin with higher affinity than FISP12/CTGF, associates strongly with the ECM (not secreted freely into medium), is internalized and degraded via the lysosomal pathway after interacting with cell surface receptors, and promotes cell proliferation, migration, and adhesion in fibroblasts, endothelial, and epithelial cells.\",\n      \"method\": \"Protein purification, heparin-binding assay, cell adhesion/migration/proliferation assays, lysosomal inhibitor experiments, immunohistochemistry\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — purified recombinant protein tested in multiple cell types with orthogonal biochemical assays; multiple functional readouts\",\n      \"pmids\": [\"9184077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Genetic deletion of Cyr61 in mice causes embryonic lethality due to failure of chorioallantoic fusion and placental vascular insufficiency; CCN1 is required for vessel bifurcation (non-sprouting angiogenesis) at the chorioallantoic junction and regulates Vegf-C expression in allantoic mesoderm.\",\n      \"method\": \"Gene knockout mouse, histology, immunohistochemistry, molecular analysis of Vegf-C expression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — definitive loss-of-function mouse genetics with specific vascular phenotype and molecular correlate\",\n      \"pmids\": [\"12446788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Xenopus Cyr61 is required for normal gastrulation movements; it acts through its adhesive properties to modulate extracellular matrix assembly and can stimulate or inhibit Wnt pathway signaling in a context-dependent manner.\",\n      \"method\": \"Gain- and loss-of-function experiments in Xenopus laevis embryos, extracellular matrix assembly assays, Wnt pathway reporter assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal readouts (gastrulation movements, ECM assembly, Wnt signaling) in a well-established vertebrate model\",\n      \"pmids\": [\"12702657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CCN1/CYR61 induces apoptosis in fibroblasts (but not endothelial cells) upon cell adhesion through integrin α6β1 and the heparan sulfate proteoglycan syndecan-4; this triggers transcription-independent p53 activation of Bax, cytochrome c release, and activation of caspase-9 and caspase-3, without requiring caspase-8 or de novo transcription/translation.\",\n      \"method\": \"Cell adhesion assay, integrin-blocking antibodies, siRNA knockdown of receptors, caspase activity assays, cytochrome c release, p53 activation assays, co-immunoprecipitation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (receptor blocking, siRNA, caspase assays, Bax activation) in a single rigorous study defining the apoptotic mechanism\",\n      \"pmids\": [\"16275757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CCN1 induces fibroblast senescence by binding to integrin α6β1 and heparan sulfate proteoglycans, activating DNA damage response pathways and p53, and stimulating the RAC1-NOX1 complex to generate ROS; this leads to ROS-dependent activation of the p16INK4a/pRb pathway, causing senescence and antifibrotic gene expression. Knockin mice expressing a senescence-defective CCN1 mutant develop exacerbated fibrosis.\",\n      \"method\": \"Knockin mouse model, integrin-blocking antibodies, ROS measurement, RAC1-NOX1 complex analysis, p53/p16/pRb pathway analysis, gene expression profiling, topical protein application\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo genetic model plus multiple orthogonal mechanistic assays (integrin binding, ROS, RAC1-NOX1, p53, p16/pRb) establishing a complete signaling pathway\",\n      \"pmids\": [\"20526329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CCN1 supports macrophage adhesion through integrin αMβ2 and syndecan-4, directly activates NF-κB-mediated transcription, and induces a proinflammatory M1 macrophage genetic program via two mechanisms: an immediate-early NF-κB-dependent cytokine response and a delayed autocrine/paracrine TNF-α-mediated secondary cytokine response.\",\n      \"method\": \"Macrophage adhesion assay, NF-κB reporter assay, integrin-blocking antibodies, siRNA knockdown of syndecan-4, gene expression profiling, TNF-α neutralization\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal receptor blocking and multiple orthogonal assays establishing two distinct mechanistic pathways\",\n      \"pmids\": [\"20164416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LPA induces temporal and spatial expression of Cyr61/CCN1, which accumulates in the Golgi apparatus and translocates to the ECM; extracellular Cyr61 bridges LPA receptor 1 (LPA1) signaling to integrin α6β1 and αvβ3, which activate focal adhesion kinase (FAK), driving smooth muscle cell migration. LPA1 knockout cells lack Cyr61 induction and migration.\",\n      \"method\": \"siRNA knockdown, antibody blockade, LPA receptor knockout cells, subcellular fractionation/immunofluorescence, FAK phosphorylation assay, cell migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic (LPA1 KO) and pharmacological (siRNA, antibody) approaches with subcellular localization and FAK activation establishing a complete signaling axis\",\n      \"pmids\": [\"24371135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CCN1 in cardiomyocytes is induced by RhoA activation downstream of GPCR agonists (S1P, LPA, endothelin-1) through MRTF-A (MKL1)/SRF signaling; secreted CCN1 binds back to cardiomyocytes in an autocrine fashion and protects against ischemia/reperfusion injury. Cardiac-specific CCN1 KO mice show increased infarct size after I/R.\",\n      \"method\": \"RhoA inhibition (C3 exoenzyme, pharmacological), MRTF-A knockdown/inhibitors, siRNA knockdown of CCN1, simulated ischemia/reperfusion in NRVMs, cardiac-specific CCN1 KO mouse model, infarct size measurement\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological approaches in vitro combined with in vivo KO mouse model establishing the RhoA/MRTF-A/CCN1 cardioprotection axis\",\n      \"pmids\": [\"25106095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN1 acts as a bridging molecule in neutrophil efferocytosis by binding phosphatidylserine on apoptotic neutrophils and integrins αvβ3/αvβ5 on macrophages; knockin mice with a CCN1 mutant unable to bind αvβ3/αvβ5 or Ccn1 knockdown mice exhibit defective neutrophil clearance, exuberant neutrophil accumulation, and delayed wound healing.\",\n      \"method\": \"Phosphatidylserine binding assay, integrin-binding assays, knockin mouse model, Ccn1 knockdown mice, efferocytosis assays, wound healing analysis in diabetic Lepr(db/db) mice\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple complementary genetic models (knockin, knockdown) with defined molecular binding interactions and specific cellular phenotype\",\n      \"pmids\": [\"26077348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN1 promotes mucosal healing in colitis by inducing IL-6 expression through integrin αMβ2 in macrophages and integrin α6β1 in fibroblasts; IL-6 in turn stimulates intestinal epithelial cell proliferation. Ccn1(dm/dm) knockin mice (αMβ2/α6β1-binding defective) show impaired healing and reduced IL-6 during DSS colitis recovery.\",\n      \"method\": \"Knockin mouse model (Ccn1 dm/dm), DSS colitis model, integrin-blocking antibodies, CCN1 protein administration, IL-6 delivery rescue, IEC proliferation assay\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockin plus receptor-blocking and rescue experiments establishing integrin-specific IL-6 induction pathway\",\n      \"pmids\": [\"25807183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN1 suppresses hepatocarcinogenesis by inhibiting EGFR-dependent compensatory hepatocyte proliferation through integrin α6-mediated ROS accumulation, leading to p53 activation and cell cycle block. Ccn1ΔHep and Ccn1(dm/dm) mice show increased DEN-induced HCC due to diminished p53 activation and elevated compensatory proliferation.\",\n      \"method\": \"Hepatocyte-specific Ccn1 KO mice, knockin mice (α6β1-binding defective), DEN-induced HCC model, ROS measurement, EGFR inhibitor (erlotinib) treatment, p53 activation assay, proliferation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two complementary genetic mouse models with detailed mechanistic pathway dissection (integrin α6→ROS→p53) and pharmacological validation\",\n      \"pmids\": [\"26028023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN1 is O-fucosylated at Thr242 in its thrombospondin type-1 repeat (TSR1) domain by protein O-fucosyltransferase 2 (POFUT2); loss of O-fucosylation reduces cell-surface localization and secretion of CCN1.\",\n      \"method\": \"Mass spectrometry identification of O-fucosylation site, mutagenesis of Thr242, POFUT2 knockdown, measurement of secreted and cell-surface CCN1\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mass spectrometry identification combined with mutagenesis and knockdown establishing a specific post-translational modification required for secretion\",\n      \"pmids\": [\"26424659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN1 binds directly to ADAMTS-4 (aggrecanase-1) through the ADAMTS-4 cysteine-rich domain and inhibits its aggrecanase activity; TGF-β-induced CCN1 expression is sufficient to block ADAMTS-4 aggrecanase activity in chondrocytes, while IL-1α stimulation that downregulates CCN1 allows ADAMTS-4 activity.\",\n      \"method\": \"Nanoscale LC-MS/MS identification, co-immunoprecipitation, solid-phase binding assay, aggrecan digestion assay, siRNA knockdown of CCN1, IL-1α/TGFβ treatment\",\n      \"journal\": \"Arthritis & rheumatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — MS identification of binding partner confirmed by pulldown and solid-phase assay, with enzymatic activity readout and genetic manipulation\",\n      \"pmids\": [\"25709087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCN1/CYR61 released by activated platelets enables the recruitment of Ly6Clow monocytes to inflamed vascular endothelium; endothelium-bound CCN1 sustains Ly6Clow monocyte patrolling and orchestrates subsequent neutrophil recruitment. Antibody blockade of CCN1 impaired early Ly6Clow monocyte arrival and abolished neutrophil recruitment.\",\n      \"method\": \"Confocal intravital microscopy, CCN1-blocking antibodies, platelet depletion, TLR7/8-mediated inflammation model in mesenteric veins\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct in vivo imaging with specific antibody blockade establishing CCN1 as a molecular mediator of monocyte recruitment\",\n      \"pmids\": [\"27482114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CCN1/CYR61 regulates sclerostin (Sost) expression in osteocytes/osteoblasts; CCN1 overexpression suppresses Sost, and Sost siRNA rescues Wnt responsiveness in Ccn1 knockout cells. Bone-specific Ccn1 KO mice show decreased bone mass with increased Sost, increased RankL, decreased VegfA, and impaired Wnt signaling.\",\n      \"method\": \"Conditional bone-specific KO mice, microCT bone analysis, in vitro overexpression/siRNA in UMR-106 cells, Axin2 reporter of Wnt signaling, bone vasculature analysis\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model combined with in vitro rescue experiments establishing CCN1→Sost→Wnt axis\",\n      \"pmids\": [\"29351359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Shear stress-induced CCN1 binds integrin α6β1 on endothelial cells to activate NF-κB, inducing atheroprone gene expression and establishing a positive feedback loop where NF-κB further increases CCN1 and α6β1 expression. Ccn1-dm/Apoe-/- knockin mice show marked resistance to ligation-induced atherosclerotic plaque formation.\",\n      \"method\": \"Knockin mouse model (Ccn1-dm/dm; Apoe-/-), carotid artery ligation atherosclerosis model, oscillatory vs. laminar shear stress experiments in ECs, NF-κB reporter assay, integrin-blocking peptide (T1)\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model combined with in vitro mechanistic experiments establishing CCN1/α6β1/NF-κB positive feedback loop with therapeutic peptide validation\",\n      \"pmids\": [\"30917686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CCN1 is a direct target of YAP transcriptional coactivator in endothelial cells; CCN1 overexpression causes nuclear exclusion/inactivation of YAP in a negative feedback loop by providing cells with a soft compliant matrix that creates YAP-repressive cytoskeletal states. EC-specific Ccn1 deletion phenocopies YAP gain-of-function with EC hyperproliferation and vessel enlargement.\",\n      \"method\": \"YAP ChIP on CCN1 promoter, EC-specific Ccn1 KO mice, AAV-mediated CCN1 expression in ischemic retinopathy, YAP nuclear localization assays, pharmacological modulation of cell stiffness\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP establishing direct genomic targeting, EC-specific KO mouse, in vivo rescue experiment, and mechanistic explanation via matrix compliance\",\n      \"pmids\": [\"31262999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CCN1 activates VEGFR2 and downstream MAPK/PI3K signaling and YAP/TAZ as well as Rho effector mDia1 to enhance endothelial tip cell activity; VEGFR2 interacts with integrin αvβ3 through CCN1, forming a complex that promotes CCN1 expression in a positive feedback loop.\",\n      \"method\": \"Zebrafish ccn1 knockdown, EC-specific Ccn1 transgenic mice, retinal vascular sprouting assay, integrin αvβ3 inhibitor, co-immunoprecipitation of VEGFR2/integrin αvβ3, YAP/TAZ activation assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (zebrafish KD, transgenic mice) with receptor co-IP and signaling pathway analysis\",\n      \"pmids\": [\"31429823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CCN1 binds bacterial pathogen-associated molecular patterns (peptidoglycans of Gram-positive bacteria and LPS of Gram-negative bacteria), opsonizes MRSA and Pseudomonas aeruginosa for phagocytosis through integrin αvβ3, and directly binds TLR2 and TLR4 to activate MyD88-dependent signaling, cytokine expression, and neutrophil mobilization.\",\n      \"method\": \"Binding assays (peptidoglycan/LPS), phagocytosis assays, ROS production assays, myeloid-specific Ccn1 KO mice, αvβ3-binding knockin mice, in vivo infection models, TLR2/TLR4 direct binding assays, MyD88-dependent signaling analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding assays for PAMPs and TLRs combined with multiple genetic mouse models and in vivo infection outcomes\",\n      \"pmids\": [\"32144270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CCN1 coordinately regulates intestinal stem cell (ISC) proliferation and differentiation through integrins αvβ3/αvβ5: CCN1 induces NF-κB-dependent Jag1 expression to activate Notch signaling for differentiation, and promotes Src-mediated YAP activation and Dkk1 expression to control Wnt signaling for proliferation; CCN1 and YAP amplify each other's activities in a regulatory loop.\",\n      \"method\": \"Ccn1 deletion in Lgr5+ ISCs, knockin mice (αvβ3/αvβ5-binding defective CCN1), crypt organoids, NF-κB reporter, Notch pathway analysis, YAP activation assay, Wnt reporter, intestinal phenotype analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two complementary genetic mouse models with organoid mechanistic studies establishing two distinct integrin-dependent pathways\",\n      \"pmids\": [\"35660741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hepatocyte CCN1 polarizes infiltrating monocytes to a proinflammatory/profibrotic phenotype in NASH through an IRAK4/SYK/NF-κB signaling cascade, inducing PDGFa/PDGFb expression in macrophages; liver-specific CCN1 KO mice show improved glucose tolerance, decreased liver inflammation, and reduced fibrosis on NASH diet.\",\n      \"method\": \"Liver-specific CCN1 KO mice, NASH diet model, in vitro macrophage treatment with CCN1, IRAK4/SYK inhibitors, NF-κB reporter, targeted antibody blockade in vitro and in vivo\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse combined with in vitro mechanistic dissection (IRAK4/SYK/NF-κB) and antibody therapeutic validation\",\n      \"pmids\": [\"37756381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Upon ferroptosis induction, CCN1 relocates from extracellular matrix to mitochondrial complexes where it facilitates ETFA-dependent fatty acid β-oxidation, providing additional substrates for mitochondrial ROS production and stimulating ferroptosis through lipid peroxidation. This CCN1-ETFA pathway is distinct from the canonical CPT2-ETFA pathway.\",\n      \"method\": \"Multiomics screening, subcellular fractionation/co-immunoprecipitation of CCN1 with mitochondrial complexes, fatty acid β-oxidation assays, ROS measurement, lipid peroxidation assays, CCN1 KO cells and mouse models, high-fat diet lung cancer models\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiomics identification with biochemical validation of mitochondrial complex interaction, functional assays, and in vivo genetic models\",\n      \"pmids\": [\"40280135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cyr61/CCN1 protects pulmonary epithelial cells against hyperoxia-induced cell death via Akt activation; siRNA-mediated knockdown of Cyr61 accelerated cell death, while overexpression conferred resistance and induced Akt phosphorylation; siRNA knockdown of Akt abrogated the protective effect.\",\n      \"method\": \"siRNA knockdown of Cyr61 and Akt, Cyr61 overexpression, Akt phosphorylation assay, cell death assays under hyperoxia\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with specific epistasis (Akt siRNA rescues Cyr61 effect), single lab\",\n      \"pmids\": [\"15961723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Caveolin-1 (cav-1) co-localizes and physically interacts with Cyr61 via integrins in bronchial epithelial cells; deletion of cav-1 increases extracellular Cyr61 secretion (by a non-classical, Brefeldin A-inhibitable pathway) and decreases cytosolic Cyr61; the protective effect of cav-1 deletion against hyperoxia requires secreted Cyr61.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by immunofluorescence, cav-1 knockout cells/mice, neutralizing antibody, Brefeldin A treatment, subcellular fractionation\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and functional validation with genetic KO, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"18801924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Full-length CCN1 is secreted in an exosome-shuttled manner; extracellular plasmin cleaves full-length CCN1 to generate a C-terminal fragment (cCCN1) that binds integrin-α7 and promotes MMP-1 production, while full-length CCN1 facilitates IL-8 and VEGF release; the two forms have opposing functions in cigarette smoke-induced lung epithelial injury.\",\n      \"method\": \"Exosome isolation, plasmin cleavage assay, integrin-α7 binding/expression analysis, siRNA knockdown, MMP-1 and VEGF/IL-8 measurement, bronchoalveolar lavage analysis in vivo\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical cleavage assay with receptor identification and functional consequences, single lab\",\n      \"pmids\": [\"24973403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CCN1 supports prostate carcinoma cell adhesion through integrins and heparan sulfate proteoglycans, promotes cell proliferation, and enhances TRAIL-induced apoptosis through integrins αvβ3 and α6β4 and syndecan-4 via a PKCα-dependent mechanism not requiring de novo protein synthesis.\",\n      \"method\": \"Integrin-blocking antibodies, syndecan-4 knockdown, CCN1 siRNA knockdown, TRAIL apoptosis assays, PKCα inhibitors, CCN1 protein rescue\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor blocking and siRNA approaches with specific kinase inhibition establishing mechanistic dichotomy, single lab\",\n      \"pmids\": [\"19584265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCN1 promotes chondrocyte maturation and cartilage development downstream of WNT/β-catenin signaling; β-catenin promotes CCN1 expression in chondrocytes, and cartilage-specific CCN1 overexpression in transgenic mice leads to chondrodysplasia and cartilage degeneration.\",\n      \"method\": \"Primary chondrocyte cultures, β-catenin gain/loss-of-function, conditional CCN1 transgenic mice, in vitro chondrocyte maturation assays with CCN1 overexpression/inhibition\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic studies combined with transgenic mouse model, single lab\",\n      \"pmids\": [\"26363286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CCN1 activates melanogenesis in human epidermal melanocytes through integrin α6β1, and downstream p38 MAPK and ERK1/2 signaling, upregulating MITF, TRP-1, and tyrosinase and promoting melanosome maturation; UVB irradiation stimulates CCN1 secretion from dermal fibroblasts, and CCN1 knockdown in fibroblasts attenuates melanogenesis in co-culture.\",\n      \"method\": \"Recombinant CCN1 treatment, integrin α6β1 blocking antibodies, p38/ERK inhibitors, siRNA knockdown of CCN1 in fibroblasts, melanocyte-fibroblast co-culture, tyrosinase activity assay\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor blocking and kinase inhibition establishing signaling pathway, paracrine mechanism validated in co-culture, single lab\",\n      \"pmids\": [\"29510193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IL-6 stimulates Cyr61 protein synthesis in fibroblast-like synoviocytes via the ERK1/2-EGR3 pathway; Cyr61 promotes FLS migration and invasion in an autocrine manner by upregulating MMP2; knockdown or neutralizing antibody to Cyr61 attenuates IL-6-induced FLS migration.\",\n      \"method\": \"Western blot, siRNA knockdown of EGR3 and JUN, ERK1/2 inhibitor (PD98059), CYR61 neutralizing antibody, wound healing assay, Boyden chamber invasion assay, MMP2 expression analysis\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic dissection of IL-6/ERK/EGR3/Cyr61/MMP2 axis, single lab\",\n      \"pmids\": [\"33228785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CCN1 expression in fibroblasts is required for bleomycin-induced skin fibrosis; fibroblast-specific CCN1 deletion reduces type I collagen stability (via reduced prolyl-4-hydroxylase and PLOD2 expression) and leads to disorganized collagen fibers, while not affecting myofibroblast induction or wound closure kinetics.\",\n      \"method\": \"Fibroblast-specific CCN1 KO mice, bleomycin-induced fibrosis model, electron microscopy of collagen fibers, hydroxyproline assay, qPCR for collagen stability enzymes, wound healing assay\",\n      \"journal\": \"Matrix biology plus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO mouse with distinct phenotype separating fibrosis from wound healing and identifying collagen stability as the mechanism, single lab\",\n      \"pmids\": [\"33543008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TGF-β-stimulated Smad2/3 and Hippo pathway effectors YAP and TEAD4 form a protein complex on the CYR61 promoter to cooperatively activate CYR61 transcription; CYR61 functions as a tumor suppressor in liver cancer cells, impeding TGF-β- or YAP-induced malignant transformation.\",\n      \"method\": \"ChIP assay on CYR61 promoter, co-immunoprecipitation of Smad2/3-YAP-TEAD4 complex, CYR61 overexpression/depletion, HCC xenograft mouse model, transcriptomic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and co-IP establishing transcriptional complex with functional in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"38521502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCN1 induces CCL20 production in keratinocytes via activation of p38 MAPK and JNK pathways, which enhance AP-1 binding to the CCL20 promoter; in vivo, CCN1 blockade or knockdown reduces CCL20 expression and ameliorates psoriasis-like inflammation in mouse models.\",\n      \"method\": \"Exogenous CCN1 protein treatment of keratinocytes, p38/JNK inhibitors, ChIP assay for AP-1 on CCL20 promoter, siRNA knockdown of CCN1, imiquimod and IL-23 psoriasis mouse models\",\n      \"journal\": \"Journal of dermatological science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus pharmacological inhibition with in vivo validation in two mouse models, single lab\",\n      \"pmids\": [\"28602508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"3-Mercaptopyruvate sulfurtransferase (3-MST) upregulates CYR61 expression via modulation of S1PR through ATF1 and CREB; endogenously produced CYR61 counteracts apoptosis in part through RhoA activation; inhibition of 3-MST markedly suppresses CYR61 secretion from colon cancer cells.\",\n      \"method\": \"Pharmacological inhibitors of CBS and 3-MST, H2S/polysulfide donors, CYR61 promoter luciferase assay, siRNA knockdown, RhoA activation assay, apoptosis assays\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter assay combined with siRNA and pharmacological dissection establishing 3-MST/ATF1/CREB/CYR61/RhoA axis, single lab\",\n      \"pmids\": [\"36113340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Endogenous CCN1 from fibroblasts is required for collagen fibril organization and scar structural integrity after myocardial infarction; fibroblast-specific CCN1 KO mice show disorganized collagen topography, reduced fibroblast-matrix interactions, and increased cardiac rupture after MI without affecting myofibroblast induction or total collagen mass; CCN1 augments fibroblast focal adhesion formation.\",\n      \"method\": \"Fibroblast-specific CCN1 KO mice, MI (coronary ligation) model, SHG and TEM collagen architecture analysis, focal adhesion assay, in vitro CCN1 siRNA, cardiac function analysis\",\n      \"journal\": \"Matrix biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO mouse with detailed ultrastructural collagen analysis, specific in vivo phenotype, single lab\",\n      \"pmids\": [\"39098433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN1/CYR61 overexpression in hepatic stellate cells induces ER stress by overloading the endoplasmic reticulum, triggering an unfolded protein response (UPR) including IRE1α-JNK, PERK-eIF2a-CHOP activation, and apoptosis via caspase-12, -9, and -3 cleavage; this reduces type I collagen expression.\",\n      \"method\": \"Adenoviral CCN1 overexpression in primary HSC and HSC lines, UPR markers (BIP/GRP78, GRP94, spliced XBP1, CHOP), caspase cleavage assays, TUNEL staining, collagen mRNA/protein measurement\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal ER stress and apoptosis markers in primary cells, single lab\",\n      \"pmids\": [\"26515130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In glomerulonephritis, CCN1 expressed by podocytes can inhibit mesangial cell migration; recombinant CCN1 enhanced endothelial cell adhesion while prominently inhibiting mesangial cell adhesion, and induced p27Kip1 and synaptopodin expression in cultured podocytes, suppressing podocyte migration.\",\n      \"method\": \"Recombinant CCN1 treatment, cell adhesion assay, cell migration assay, Western blot for p27Kip1 and synaptopodin, in situ hybridization, immunohistochemistry\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — recombinant protein functional assays in multiple cell types with specific molecular readouts, single lab\",\n      \"pmids\": [\"17699553\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCN1/CYR61 is a secreted, ECM-associated matricellular protein that functions as a multi-integrin ligand: it drives diverse and sometimes opposing cellular responses depending on cell type and receptor context—promoting survival/angiogenesis through αvβ3/αvβ5, inducing apoptosis and senescence through α6β1/syndecan-4 (via RAC1-NOX1 ROS and p53/p16INK4a pathways), activating NF-κB-mediated proinflammatory programs in macrophages through αMβ2/syndecan-4, mediating neutrophil efferocytosis as a bridging opsonin for phosphatidylserine and αvβ3/αvβ5, acting as a pattern recognition receptor that directly binds TLR2/TLR4 to activate MyD88-dependent signaling, relocating to mitochondria during ferroptosis to facilitate ETFA-dependent fatty acid β-oxidation, and coordinating intestinal stem cell homeostasis through integrin αvβ3/αvβ5-driven NF-κB/Notch and Src/YAP/Wnt pathways; its secretion requires O-fucosylation at Thr242 by POFUT2, and its expression is transcriptionally controlled by RhoA/MRTF-A, YAP/TEAD, and TGF-β/Smad signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCN1 (CYR61) is a secreted, heparin- and ECM-associated matricellular protein, first identified as a serum/PDGF-inducible immediate-early gene product that associates strongly with the extracellular matrix rather than diffusing freely, and is internalized and degraded via the lysosome [#0, #1]. It functions principally as a multivalent integrin ligand whose biological output is dictated by the receptor and cell-type context. Through αvβ3/αvβ5 it supports survival, adhesion, and angiogenesis\\u2014its genetic deletion causes embryonic lethality from failed chorioallantoic fusion and placental vascular insufficiency [#2], and it amplifies endothelial tip-cell activity by coupling VEGFR2 to αvβ3 [#18]. Through integrin α6β1 together with the heparan sulfate proteoglycan syndecan-4, CCN1 instead drives transcription-independent p53-dependent apoptosis in fibroblasts [#4] and RAC1-NOX1 ROS-dependent senescence via the p16INK4a/pRb pathway, with a senescence-defective knockin allele producing exacerbated fibrosis [#5]. In innate immunity, CCN1 engages αMβ2/syndecan-4 on macrophages to directly activate NF-\\u03baB and a proinflammatory program [#6], serves as a phosphatidylserine-bridging opsonin for neutrophil efferocytosis via αvβ3/αvβ5 [#9], and acts as a pattern-recognition molecule binding bacterial PAMPs and directly engaging TLR2/TLR4 to trigger MyD88-dependent signaling [#19]. CCN1 expression is itself an integrating node of mechanotransduction and growth-factor signaling, induced by RhoA/MRTF-A [#8], YAP/TEAD [#17, #31], and TGF-\\u03b2/Smad [#31], and its secretion and cell-surface display require O-fucosylation at Thr242 by POFUT2 [#12]. Across intestinal stem cells [#20], bone [#15], liver [#11, #21], and vasculature [#16], CCN1 coordinates NF-\\u03baB/Notch, Src/YAP/Wnt, and integrin-α6β1/NF-\\u03baB feedback circuits to balance proliferation, differentiation, inflammation, and tissue repair.\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established the molecular identity and regulation of CCN1 as a secreted cysteine-rich immediate-early gene product, framing it as a candidate growth-factor-responsive signaling molecule.\",\n      \"evidence\": \"Northern blot, immunoprecipitation, cell-cycle and PKC-pathway inhibition in cultured cells\",\n      \"pmids\": [\"2355916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No receptor or downstream signaling identified\", \"Function of the secreted protein not defined\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Defined CCN1 as an ECM-associated, heparin-binding ligand acting on cell-surface receptors to promote adhesion, migration, and proliferation, moving it from a transcript to a functional matricellular protein.\",\n      \"evidence\": \"Purified recombinant protein in heparin-binding, adhesion/migration/proliferation, and lysosomal-degradation assays across multiple cell types\",\n      \"pmids\": [\"9184077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific receptors not yet identified\", \"Mechanism of cell-type-specific responses unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated an essential, non-redundant in vivo role in vascular development, establishing CCN1 as required for placental angiogenesis and viability.\",\n      \"evidence\": \"Cyr61 knockout mouse with histology and Vegf-C expression analysis\",\n      \"pmids\": [\"12446788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor mediating the angiogenic effect not defined\", \"Relationship between vascular and other functions unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved how CCN1 can be proapoptotic by identifying α6β1/syndecan-4 engagement that triggers transcription-independent p53/Bax-mediated apoptosis, explaining cell-type-specific opposing outcomes.\",\n      \"evidence\": \"Receptor-blocking antibodies, siRNA, caspase and cytochrome c assays in fibroblasts versus endothelial cells\",\n      \"pmids\": [\"16275757\", \"15961723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How receptor context switches survival versus death not fully resolved\", \"In vivo relevance not yet tested at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected CCN1 to senescence and inflammation by defining the α6β1-RAC1-NOX1-ROS-p16/pRb senescence axis and the αMβ2/syndecan-4-NF-\\u03baB macrophage program, with an in vivo antifibrotic role.\",\n      \"evidence\": \"Senescence-defective knockin mice, ROS and RAC1-NOX1 assays, macrophage NF-\\u03baB reporters and receptor blocking\",\n      \"pmids\": [\"20526329\", \"20164416\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of distinct integrin engagement unresolved\", \"How ROS levels are tuned for senescence versus apoptosis unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed CCN1 within upstream signaling cascades, showing LPA1-induced CCN1 bridges to α6β1/αvβ3-FAK to drive smooth muscle migration and that RhoA/MRTF-A induction yields autocrine cardioprotection.\",\n      \"evidence\": \"LPA1 knockout cells, RhoA/MRTF-A inhibition, cardiac-specific CCN1 KO and I/R injury models\",\n      \"pmids\": [\"24371135\", \"25106095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific determinants of protective versus damaging output unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded CCN1 into innate immune clearance and biosynthetic regulation: it bridges phosphatidylserine to αvβ3/αvβ5 for efferocytosis, requires POFUT2 O-fucosylation at Thr242 for secretion, and directly inhibits ADAMTS-4 aggrecanase.\",\n      \"evidence\": \"Knockin/knockdown efferocytosis mice, mass spectrometry plus Thr242 mutagenesis, co-IP and aggrecan digestion assays\",\n      \"pmids\": [\"26077348\", \"26424659\", \"25709087\", \"25807183\", \"26028023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether O-fucosylation modulates receptor selectivity not tested\", \"Range of direct protein partners beyond ADAMTS-4 unexplored\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined CCN1 as a mechanotransduction node embedded in feedback loops: shear-induced α6β1/NF-\\u03baB promotes atherosclerosis, while YAP directly targets CCN1, which in turn restrains YAP through matrix compliance, and CCN1 couples VEGFR2-αvβ3 for sprouting.\",\n      \"evidence\": \"Knockin atherosclerosis mice, YAP ChIP on CCN1 promoter, EC-specific KO, zebrafish/mouse angiogenesis and VEGFR2 co-IP\",\n      \"pmids\": [\"30917686\", \"31262999\", \"31429823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How opposing positive and negative feedback loops are balanced in vivo unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established CCN1 as a bona fide pattern-recognition molecule binding bacterial PAMPs and directly engaging TLR2/TLR4 to drive MyD88-dependent antimicrobial responses.\",\n      \"evidence\": \"PAMP and TLR binding assays, phagocytosis assays, myeloid-specific KO and binding-defective knockin mice in infection models\",\n      \"pmids\": [\"32144270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of direct TLR binding not defined\", \"Relationship between TLR and integrin engagement unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a tissue-homeostatic role in intestinal stem cells, showing CCN1 partitions αvβ3/αvβ5 signaling into NF-\\u03baB/Jag1-Notch differentiation and Src/YAP/Wnt proliferation arms in a reciprocal loop with YAP.\",\n      \"evidence\": \"Lgr5+ ISC Ccn1 deletion, binding-defective knockin mice, crypt organoids with Notch/YAP/Wnt readouts\",\n      \"pmids\": [\"35660741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single ligand bifurcates into distinct downstream programs mechanistically unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed an unexpected intracellular function: during ferroptosis CCN1 relocates to mitochondrial complexes to facilitate ETFA-dependent fatty acid β-oxidation, fueling ROS and lipid peroxidation distinct from the canonical CPT2-ETFA route.\",\n      \"evidence\": \"Multiomics screening, subcellular fractionation/co-IP with mitochondrial complexes, β-oxidation and lipid peroxidation assays, KO cells and mouse models\",\n      \"pmids\": [\"40280135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CCN1 trafficking from ECM to mitochondria unknown\", \"How a secreted protein accesses the mitochondrial matrix unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single matricellular ligand's structural features dictate the choice among integrin/co-receptor partners and thereby switch between survival, apoptosis, senescence, inflammation, and intracellular metabolic roles.\",\n      \"evidence\": \"Synthesis across context-dependent integrin and receptor studies in the timeline\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of CCN1-receptor complexes\", \"Determinants of cell-type-specific output not defined\", \"Trafficking routes between ECM, surface, and organelles incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 4, 5, 6, 9, 18, 20]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [4, 5, 6, 16, 19]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [1, 7, 22]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 24]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 9, 14, 19, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 7, 16, 18, 20]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [1, 30, 34]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 3, 15, 27]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ITGAV\", \"ITGB3\", \"ITGA6\", \"ITGB1\", \"SDC4\", \"TLR4\", \"TLR2\", \"ETFA\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}