{"gene":"MMP3","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1999,"finding":"MMP3/stromelysin-1 (Str1) expression in phenotypically normal mammary epithelial cells promotes epithelial-to-mesenchymal transition and formation of invasive mesenchymal-like tumors in vivo; this tumor-initiating activity is blocked by co-expression of a TIMP1 transgene, placing MMP3 upstream of TIMP1-sensitive proteolytic events in mammary carcinogenesis.","method":"Transgenic mouse model with tetracycline-regulated MMP3 expression and TIMP1 co-expression; in vivo tumor assays; genomic analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean transgenic gain-of-function with genetic rescue (TIMP1 co-expression), replicated across multiple mouse models in a landmark study","pmids":["10428026"],"is_preprint":false},{"year":2008,"finding":"MMP3 functions as an inflammatory mediator in activated microglia: inhibition of MMP-3 suppresses LPS-induced iNOS expression, pro-inflammatory cytokine production, and activities of NF-κB, AP-1, and MAPK in microglia. Cross-talk exists between ROS and MMP-3, with ROS acting as an early signaling inducer upstream of MMP-3 induction.","method":"Pharmacological MMP inhibition in primary cultured microglia and BV2 microglial cells; NF-κB/AP-1/MAPK activity assays; ROS inhibition experiments","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal inhibitor approaches in two cell systems, single lab","pmids":["18419763"],"is_preprint":false},{"year":2013,"finding":"ERα signaling in osteoblasts upregulates MMP3 expression, and MMP3 then cleaves and solubilizes osteoblast-expressed FasL; soluble FasL drives osteoclast apoptosis. Specific MMP3 inhibition or MMP3 siRNA knockdown blocks FasL cleavage and prevents E2-induced osteoclast apoptosis, establishing a ERα→MMP3→FasL cleavage→osteoclast apoptosis axis.","method":"MMP3 siRNA knockdown; specific MMP3 inhibitor; EGFP-FasL fluorescence cleavage assay; conditioned media experiments; calvarial organ cultures; ERαKO mouse osteoblasts; osteoclast–osteoblast co-culture","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (siRNA, chemical inhibitor, KO mouse cells, co-culture) in a single focused mechanistic study","pmids":["22927007"],"is_preprint":false},{"year":2014,"finding":"Tumor cell-derived MMP3 stimulates expression of Rac1b (a tumorigenic splice isoform of Rac1) in pancreatic cancer cells, increases cellular invasiveness, and activates tumorigenic transcriptional profiles. In transgenic mice, MMP3 co-expression with activated KRAS in pancreatic acinar cells stimulates metaplasia and immune cell infiltration, priming the stromal microenvironment.","method":"Human PDA tissue cohort analysis; transgenic mouse models; recombinant MMP3 treatment of cultured pancreatic cancer cells; invasion assays; transcriptional profiling","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic model plus in vitro recombinant protein treatment, human tissue correlation, multiple orthogonal approaches","pmids":["24850902"],"is_preprint":false},{"year":2016,"finding":"NFAT1 (NFATc2) directly transcriptionally regulates MMP3 expression in melanoma cells; NFAT1 depletion reduces MMP3 expression, NFAT1 overexpression induces it, and restoration of NFAT1 recovers MMP3 to baseline. MMP3 promotes melanoma tumor growth and lung metastasis in vivo.","method":"Stable NFAT1 silencing; microarray; NFAT1 overexpression/rescue experiments; in vivo tumor and metastasis models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss/rescue experiments plus in vivo validation, single lab","pmids":["27013197"],"is_preprint":false},{"year":2017,"finding":"Decreased MMP-3 activity is detected in glaucomatous aqueous humor compared to controls. AAV-mediated MMP-3 expression in corneal endothelium increases aqueous humor MMP-3 concentration and activity, increases outflow facility, and decreases intraocular pressure in mice. MMP-3 remodels extracellular matrix components in the trabecular meshwork/Schlemm's canal pathway.","method":"AAV-2/9 intracameral inoculation; MMP-3 enzymatic activity assay; intraocular pressure measurement; transendothelial resistance assay; transmission electron microscopy of matrix remodeling","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vivo AAV gene delivery with functional IOP readout, biochemical activity assay, ultrastructural analysis, and ex vivo cell monolayer assays","pmids":["28158775"],"is_preprint":false},{"year":2004,"finding":"A single base pair insertion/deletion variant in the MMP3 promoter (5A/6A, located 1608 bp from the transcription start site) alters transcription factor binding and influences levels of MMP3 mRNA and protein, with the 5A allele associated with higher expression. Positive selection increased the frequency of the high-expression (5A) allele in European populations approximately 24,000 years ago.","method":"Phylogenetic and population genetic analysis; functional transcription factor binding assay; mRNA/protein quantification","journal":"Current biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional promoter binding assay combined with population genetics; single lab","pmids":["15341739"],"is_preprint":false},{"year":2013,"finding":"Psychosine (galactosylsphingosine) induces MMP-3 expression and production in primary microglia, and MMP-3 mediates morphological transformation of microglia into multinucleated globoid cells. Genetic ablation or chemical inhibition of MMP-3 prevents psychosine-induced globoid cell formation. This process is microglia-specific; peripheral macrophages do not respond similarly.","method":"MMP-3 knockout mice; chemical MMP-3 inhibition; primary glial cultures; psychosine treatment; immunohistochemistry in twitcher mice","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus chemical inhibitor in primary cells, with in vivo disease model validation","pmids":["23404611"],"is_preprint":false},{"year":2013,"finding":"Phosphorylated STAT3 directly binds to the MMP3 promoter in human brain microvascular endothelial cells and transcriptionally activates MMP3 expression. Heme-induced STAT3 activation leads to MMP3 upregulation and contributes to endothelial cell apoptosis.","method":"Chromatin immunoprecipitation (ChIP); luciferase reporter assay with MMP3 promoter construct; qRT-PCR; Western blot; TUNEL apoptosis assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct ChIP demonstrating STAT3 binding to MMP3 promoter, confirmed by promoter-luciferase reporter, single lab","pmids":["23967200"],"is_preprint":false},{"year":2013,"finding":"NFATc3 directly regulates MMP3 transcription in astrocytes in a calcium/calcineurin-dependent manner. Constitutively active NFATc3 induces Mmp3 expression; calcium ionophore and ATP stimulation increase Mmp3 mRNA and protein; calcineurin inhibitor cyclosporin A prevents this. An MMP3 promoter-luciferase reporter was activated by increased intracellular Ca2+. In vivo, MMP3 is expressed in NFATc3-positive scar-forming astrocytes after brain injury.","method":"Constitutively active NFATc3 overexpression; calcium ionophore treatment; MMP3 promoter-luciferase reporter assay; calcineurin inhibitor (CsA) treatment; in vivo stab-wound brain injury model; immunohistochemistry","journal":"Glia","confidence":"High","confidence_rationale":"Tier 1 / Moderate — promoter-reporter assay, gain-of-function, pharmacological inhibition, and in vivo validation in single focused study","pmids":["23625833"],"is_preprint":false},{"year":2008,"finding":"AMF/PGI transactivates the MMP-3 gene promoter through AP-1 via the Src-RhoA-PI3-kinase signaling pathway to induce hepatoma cell migration. The three signaling molecules Src, RhoA, and PI3-kinase form a complex, and MMP-3 induction correlates with AMF/PGI enzymatic activity.","method":"MMP-3 promoter-luciferase reporter assay; signaling pathway inhibitors; co-immunoprecipitation of Src-RhoA-PI3K complex; cell migration assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter with Co-IP and functional migration assay, single lab","pmids":["18571835"],"is_preprint":false},{"year":2008,"finding":"Keratinocyte expression of MMP3 promotes cellular differentiation and impedes tumor establishment; MMP3-expressing papilloma cell lines lost capacity to form palpable tumors in vivo and showed increased differentiation in vitro; this differentiation effect was inhibited by broad-spectrum MMP inhibitors and selective MMP3 inhibition.","method":"Transgenic mice with keratinocyte-targeted MMP3; chemical carcinogenesis model; orthotopic injection of stable MMP3-expressing cell lines; in vitro differentiation assays with MMP3 inhibition","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Strong — transgenic gain-of-function plus cell line experiments with selective MMP3 inhibition in both in vivo and in vitro settings","pmids":["18832569"],"is_preprint":false},{"year":2011,"finding":"ERK1 and ERK2 each regulate IL-1β-induced MMP3 (and MMP13) expression in human chondrocytes; knockdown of either ERK1 or ERK2 alone significantly reduces IL-1β-induced MMP3 protein and mRNA, and combined knockdown has synergistic suppression. No compensatory upregulation of the opposing isoform occurs.","method":"Specific siRNA knockdown of ERK1, ERK2, or both; IL-1β stimulation; quantitative RT-PCR; ELISA; Western blot","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific siRNA knockdowns with multiple readouts, single lab","pmids":["21305249"],"is_preprint":false},{"year":2011,"finding":"Protein kinase D1 (PKD1) mediates synergistic MMP-3 expression induced by TNF-α and bradykinin in human colonic myofibroblasts. siRNA targeting PKD1 completely inhibited MMP-3 mRNA and protein expression; the signaling cascade involves PKC, PKD1, and MEK acting at the transcriptional level.","method":"PKD1 siRNA knockdown; PKC inhibitors (GF109203X, Go6983); MEK inhibitor (U0126); MMP-3 mRNA and protein quantification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus multiple pharmacological inhibitors, single lab","pmids":["21867693"],"is_preprint":false},{"year":2012,"finding":"Substance P stimulates MMP3 expression and protein production in human tenocytes via the neurokinin-1 receptor (NK-1R). Gene expression analysis showed SP-induced increases in MMP3, COL3A1, and ACTA2 mRNA in 3D collagen lattices. Cyclic tensile loading together with SP had an additive effect on MMP3 expression. Immunoblotting confirmed NK-1R mediation of MMP3 protein upregulation.","method":"3D collagen lattice culture; NK-1R-mediated signaling experiments; gene expression analysis; cyclic tensile loading; immunoblotting","journal":"Journal of orthopaedic research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — receptor-specific pharmacology with multiple readouts including 3D culture and mechanical loading, single lab","pmids":["22836729"],"is_preprint":false},{"year":2014,"finding":"HOXA10 promotes MMP-3 expression and pancreatic cancer cell invasion via a TGFβ2-p38 MAPK pathway. Knockdown of HOXA10 decreases TGFβ2 and MMP-3 and suppresses p38 activation; TGFβ2 neutralization blocks HOXA10-driven MMP-3 induction; p38 inhibition suppresses MMP-3 expression and invasion.","method":"HOXA10 knockdown and overexpression; TGFβ2 neutralizing antibody; p38 inhibitor (SB239063); invasion and migration assays; Western blot","journal":"Digestive diseases and sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple perturbations (KD, OE, pathway inhibitors) in a single lab","pmids":["24464212"],"is_preprint":false},{"year":2016,"finding":"MMP3 overexpression in preadipocytes (3T3-L1) inhibits adipogenic differentiation; recombinant human MMP3 added to primary human preadipocytes inhibits differentiation; recombinant TIMP4 rescues adipogenesis and attenuates MMP3's inhibitory effect. In male mice, high-fat diet-induced obesity increases MMP3 protein and enzymatic activity, whereas in females it decreases MMP3 protein. These data establish MMP3 as an antiadipogenic factor regulated sex-dependently.","method":"Mmp3 overexpression in 3T3-L1 preadipocytes; rhMMP3 and rhTIMP4 treatment of primary human preadipocytes; enzymatic activity assays; protein quantification; sex-stratified HFD mouse model","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches including recombinant protein rescue, gain-of-function, and in vivo mouse model with enzymatic activity readouts","pmids":["27879248"],"is_preprint":false},{"year":2017,"finding":"BMAL1 deficiency enhances Mmp3 transcription through activating p65 (NF-κB) phosphorylation. Mmp3 KO mice show reduced mandibular hypoplasia, and MMP3 is elevated in BMAL1-deficient mice and juvenile patients with skeletal mandibular hypoplasia, establishing BMAL1 as a transcriptional repressor of MMP3 via NF-κB p65.","method":"BMAL1-deficient mice; RNA sequencing; protein chip analysis; Western blot for p65 phosphorylation; immunohistochemistry; human patient samples","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO model with mechanistic p65 phosphorylation readout and human tissue validation, single lab","pmids":["29276151"],"is_preprint":false},{"year":2015,"finding":"IRF8 directly transcriptionally represses MMP3, forming an inverse IRF8-MMP3 axis. Growth advantage from IRF8 loss is significantly compromised after MMP3 silencing. MMP3 loss reduces spontaneous lung metastasis in an orthotopic mouse mammary carcinoma model and acts in a cell-intrinsic manner.","method":"Gene expression profiling; IRF8 loss/gain experiments; MMP3 siRNA silencing in IRF8-deficient tumors; orthotopic mammary carcinoma mouse model; lung metastasis quantification","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis (IRF8 KO rescued by MMP3 KD), in vivo metastasis model, single lab","pmids":["26008967"],"is_preprint":false},{"year":2004,"finding":"A bacterial ligand of integrin α5β1 (protein I/II from oral streptococci) induces upregulation of MMP-3 gene expression and increased pro-MMP-3 release in rheumatoid arthritis fibroblast-like synoviocytes (RA FLSs), but not in osteoarthritis FLSs, suggesting integrin α5β1-mediated MMP-3 induction contributes to RA joint destruction.","method":"Human cancer cDNA expression arrays; RT-PCR; pro-MMP-3 assay on conditioned media from RA FLSs treated with protein I/II","journal":"Arthritis research & therapy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — transcriptional array confirmed by RT-PCR and secretion assay, disease-specificity comparison, single lab","pmids":["15642131"],"is_preprint":false},{"year":2013,"finding":"Eotaxin-1 (CCL11) induces MMP-3 mRNA expression and protein secretion in human chondrocytes through G protein-coupled receptor activities. ERK and p38 kinase inhibitors repress eotaxin-1-induced MMP-3 expression, while cAMP/PKA antagonism enhances it. MMP-3 protein secretion is regulated specifically by PLC-PKC cascade and JNK/MAPK pathways downstream of eotaxin-1 receptor.","method":"ERK, p38, PKA, PLC-PKC, and JNK pathway inhibitors; dose-response experiments; MMP-3 mRNA quantification; ELISA of secreted MMP-3; primary chondrocytes and SW1353 cell line","journal":"Journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple pharmacological inhibitors dissecting expression vs. secretion, single lab","pmids":["22114952"],"is_preprint":false},{"year":2014,"finding":"MMP3 promoter polymorphisms (rs522616 and rs3025058) are functional: the rs522616 A allele binds a specific DNA-protein complex and shows greater promoter activity than the G allele, but the ultimate effect is regulated by the rs3025058 background allele. For TIMP2 rs8179096, the T allele shows ~2.5-fold increased promoter activity versus C, and both alleles bind NF-κB.","method":"Electrophoretic mobility shift assay (EMSA) for DNA-protein complex; promoter-luciferase reporter assays; allele-specific transfection experiments","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — promoter-reporter and EMSA are direct functional assays, but single lab and limited to two polymorphisms","pmids":["24799419"],"is_preprint":false},{"year":2019,"finding":"Notch3 (NICD3) expression in prostate cancer cells elevates MMP-3 secretion, and inhibition of MMP-3 rescues NICD3-induced osteoblastic bone lesion phenotypes. Active Notch3 reduces osteolytic lesion area and enhances osteoblastogenesis while inhibiting osteoclastogenesis, and this is mediated through MMP-3, defining a Notch3-MMP-3 axis in bone metastasis.","method":"Notch3 gain/loss-of-function in mouse tibia xenografts; MMP-3 inhibition rescue experiments; conditioned medium osteoblast/osteoclast differentiation assays; clinical osteoblastic metastasis samples","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic manipulation in vivo, pharmacological rescue with MMP-3 inhibitor, functional in vitro assays, and human tissue validation","pmids":["31467432"],"is_preprint":false},{"year":2020,"finding":"MMP3 ablation in prostate cancer cells reduces in vitro cell growth with decreased AKT and ERK phosphorylation and lower VEGFR1 and FGFR3 protein levels. In vivo, MMP-3-ablated tumors grow slower and are less vascularized. MMP-3 in conditioned media supports endothelial tube formation, establishing intrinsic (growth signaling) and extrinsic (angiogenesis) roles for tumor-derived MMP-3.","method":"MMP-3 siRNA ablation; in vitro growth assay; AKT/ERK phosphorylation Western blot; in vivo tumor growth; endothelial tube formation assay; qPCR for angiogenic factors","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combined in vivo and in vitro loss-of-function with multiple signaling readouts, single lab","pmids":["32896761"],"is_preprint":false},{"year":2020,"finding":"MMP3 knockout (by CRISPR/Cas9) in tumor cells reduces tumoroid size, promotes necrosis within tumoroids, and causes additional release of broken EVs. MMP3-rich EVs from wild-type tumoroids can rescue MMP3-KO tumoroid growth, whereas MMP3-null EVs cannot, demonstrating that EV-mediated transfer of MMP3 protein promotes tumor cell proliferation and tumorigenesis.","method":"CRISPR/Cas9 MMP3 knockout; 3D tumoroid culture; EV isolation and characterization; fluorescent EV transfer assay; conditioned medium rescue experiments; Ki-67 proliferation marker","journal":"Cancers","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO with rescue by MMP3-enriched EVs in 3D model, multiple orthogonal methods","pmids":["32429403"],"is_preprint":false},{"year":2024,"finding":"Loss of KMT2C or KMT2D (H3K4 methyltransferases) leads to epigenetic upregulation of MMP3 via enhanced KDM6A (H3K27me3 demethylase) binding at the Mmp3 locus, associated with altered H3K4me1, H3K27ac, and H3K27me3 marks. Pharmacological KDM6A inhibition or direct MMP3 downregulation prevents brain metastasis in TNBC models, establishing a KMT2C/D loss → KDM6A → MMP3 → brain metastasis axis.","method":"KMT2C/D knockout mouse models; global chromatin profiling (ChIP-seq for H3K4me1, H3K27ac, H3K27me3); KDM6A ChIP-seq; KDM6A pharmacological inhibition; Mmp3 siRNA knockdown; in vivo brain metastasis assays; human KMT2C-mutant TNBC samples","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP-seq epigenomic profiling, in vivo genetic models, pharmacological validation, and human tissue confirmation in a single rigorous study","pmids":["38926506"],"is_preprint":false},{"year":2023,"finding":"IGF2BP3 binds and stabilizes MMP3 mRNA through interaction with N6-methyladenosine (m6A) modification, upregulating MMP3 protein expression. MMP3 acts downstream of IGF2BP3 to regulate cardiomyocyte proliferation and cardiac regeneration after myocardial infarction in mice.","method":"IGF2BP3 gain/loss-of-function in mice; m6A binding assay (MeRIP); mRNA stability experiments; cardiac injury model; cardiomyocyte proliferation assay; functional cardiac assays","journal":"Cell death discovery","confidence":"High","confidence_rationale":"Tier 1 / Moderate — m6A RNA binding biochemistry plus in vivo gain/loss-of-function with functional cardiac readout, single lab","pmids":["37188676"],"is_preprint":false},{"year":2019,"finding":"ERK1 (but not ERK2) phosphorylates ATF-2, which then directly contributes to IL-1β-induced MMP-3 mRNA expression in dermal fibroblasts. ERK inhibitor blocks both ATF-2 phosphorylation and MMP-3 induction; ERK1 siRNA reduces ATF-2 phosphorylation and MMP-3 expression, but ERK2 siRNA does not affect ATF-2 phosphorylation, defining an isoform-specific ERK1/ATF-2/MMP-3 axis.","method":"ERK1 and ERK2 specific siRNA knockdown; ERK inhibitor (FR180204); ATF-2 siRNA and inhibitor; phosphorylation Western blot; MMP-3 mRNA quantification","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific siRNA combined with phosphorylation readout, single lab","pmids":["31536594"],"is_preprint":false},{"year":2017,"finding":"TWIST1 upregulates MMP3 expression in chondrocytes without directly binding the MMP3 promoter; instead, TWIST1 increases 5-hydroxymethylcytosine (5hmC) levels at the MMP3 promoter by inducing TET1 expression. TWIST1-dependent Mmp3 upregulation is suppressed in Tet triple KO fibroblasts, establishing a TWIST1→TET1→5hmC(MMP3 promoter)→MMP3 epigenetic regulatory axis.","method":"TWIST1 stable transfection; 5hmC chromatin analysis at MMP3 promoter; TET1/2/3 expression analysis; Tet triple KO fibroblasts from mouse ES cells; human OA and normal cartilage tissue comparison","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — epigenetic mechanism with promoter 5hmC mapping, TET family KO validation, and human tissue context","pmids":["28220902"],"is_preprint":false},{"year":2022,"finding":"Decidual macrophages are the predominant source of MMP3 in the first-trimester decidua. Decidual macrophage conditioned medium facilitates breakdown of laminin and fibronectin in a chorionic plate artery model of spiral artery remodeling, and this effect is abrogated by a MMP3 inhibitor, establishing MMP3 from decidual macrophages as a key mediator of extracellular matrix breakdown in spiral artery remodeling during early pregnancy.","method":"Decidual macrophage isolation and conditioned medium preparation; MMP membrane array; immunohistochemistry co-localization; chorionic plate artery ex vivo model; MMP3 inhibitor; fibronectin/laminin quantification (quickscore)","journal":"Journal of reproductive immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MMP3 inhibitor rescue in an ex vivo vascular remodeling model with cell-type localization, single lab","pmids":["35176662"],"is_preprint":false},{"year":2024,"finding":"MMP-3 mediates copper oxide nanoparticle (Nano-CuO)-induced pulmonary inflammation and fibrosis: Nano-CuO exposure induces MMP-3 overexpression and secretion in mouse lungs; MMP-3 knockdown significantly attenuates Nano-CuO-induced acute and chronic lung inflammation, injury, and fibrosis. MMP-3 also mediates Nano-CuO-induced cleavage of osteopontin (OPN), and MMP-3 knockdown reduces cleaved OPN levels.","method":"In vivo MMP-3 knockdown in mouse lungs; Nano-CuO exposure; bronchoalveolar lavage analysis; H&E and Trichrome staining; hydroxyproline content measurement; cleaved OPN assay","journal":"Journal of nanobiotechnology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo MMP-3 knockdown with multiple disease readouts and OPN substrate cleavage, single lab","pmids":["39030581"],"is_preprint":false},{"year":2021,"finding":"GBP5 promotes glioblastoma cell proliferation, migration, and invasion through the Src/ERK1/2/MMP3 signaling axis; GBP5 overexpression upregulates MMP3 and Src/ERK1/2 activation, while silencing GBP5 by RNA interference has opposite effects and impairs tumor growth in vivo.","method":"GBP5 overexpression and RNA interference; in vitro proliferation, migration, invasion assays; in vivo GBM tumor model; Src/ERK1/2/MMP3 pathway analysis by Western blot","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with in vivo validation and pathway characterization, single lab","pmids":["33608513"],"is_preprint":false},{"year":2022,"finding":"MMP3 knockout in mice significantly increases trabecular bone mass and trabecular number, and protects from ovariectomy-induced bone loss by inhibiting bone resorption rather than affecting bone formation. In humans, a MMP3 promoter polymorphism (rs632478) is associated with bone mineral density and affects promoter activity in transfection experiments.","method":"Mmp3 KO mice; ovariectomy model; micro-CT bone microarchitecture analysis; bone histomorphometry; promoter-luciferase reporter assay; human cohort analysis","journal":"FASEB bioAdvances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with specific bone resorption readouts and functional promoter assay, single lab","pmids":["35949513"],"is_preprint":false}],"current_model":"MMP3 (stromelysin-1) is a secreted matrix metalloproteinase that degrades multiple ECM components (collagens, fibronectin, laminin, proteoglycans) and activates other MMPs; its expression is transcriptionally regulated by multiple pathways including STAT3 (direct promoter binding), NFATc3/calcineurin (calcium-dependent), NFAT1, ERα, BMAL1/NF-κB, TWIST1/TET1-mediated DNA hydroxymethylation, and KMT2C/D–KDM6A epigenetic control; signaling cascades including ERK1/ATF-2, Src-RhoA-PI3K/AP-1, p38/JNK MAPK, PKC/PKD1/MEK, and PI3K/Akt/FOXO3 modulate its expression and secretion; MMP3 drives epithelial-to-mesenchymal transition and tumor initiation/metastasis partly through induction of Rac1b; it cleaves FasL to generate soluble FasL that triggers osteoclast apoptosis downstream of ERα signaling; it stabilizes its own mRNA via m6A-dependent IGF2BP3 binding to promote cardiomyocyte regeneration; it acts as an antiadipogenic factor, a regulator of aqueous humor outflow facility and intraocular pressure, a mediator of microglial globoid cell formation, and a contributor to spiral artery remodeling in pregnancy, collectively establishing MMP3 as a multifunctional extracellular protease whose activity is context-dependently tumor-promoting or tumor-suppressive depending on cell type and tissue context."},"narrative":{"mechanistic_narrative":"MMP3 (stromelysin-1) is a secreted, TIMP-sensitive extracellular metalloprotease that remodels extracellular matrix and processes signaling substrates to drive tissue remodeling, inflammation, and tumor progression across many cell types [PMID:10428026, PMID:35176662]. In epithelial systems it is a potent inducer of epithelial-to-mesenchymal transition and tumor initiation, an activity blocked by TIMP1 co-expression, and it amplifies invasive and metastatic programs in part by stimulating the tumorigenic Rac1b splice isoform in pancreatic cancer cells [PMID:10428026, PMID:24850902]. MMP3 supports tumor cell-intrinsic growth signaling (AKT/ERK phosphorylation) and extrinsic angiogenesis, can be transferred between tumor cells via extracellular vesicles to promote proliferation, and mediates organ-specific metastasis such as brain colonization downstream of KMT2C/D loss and Notch3-driven osteoblastic bone lesions [PMID:31467432, PMID:32896761, PMID:32429403, PMID:38926506]. Its substrate repertoire includes structural ECM proteins laminin and fibronectin during spiral artery remodeling, FasL (whose cleavage releases soluble FasL to trigger osteoclast apoptosis downstream of ERα), and osteopontin in nanoparticle-induced lung injury [PMID:35176662, PMID:22927007, PMID:39030581]. Beyond cancer, MMP3 acts as an inflammatory mediator in activated microglia and drives psychosine-induced microglial globoid cell formation, functions as an antiadipogenic factor reversible by TIMP4, regulates aqueous humor outflow and intraocular pressure through trabecular meshwork matrix remodeling, and restrains trabecular bone mass by promoting bone resorption [PMID:18419763, PMID:23404611, PMID:27879248, PMID:28158775, PMID:35949513]. MMP3 transcription is a heavily integrated node: it is directly activated by STAT3, NFATc3 (calcium/calcineurin-dependent), and NFAT1, repressed by IRF8 and by BMAL1 acting through NF-κB p65, induced epigenetically via TWIST1→TET1→5hmC and via KMT2C/D loss→KDM6A, and converges on multiple MAPK cascades including isoform-specific ERK1/ATF-2 and PKC/PKD1/MEK signaling [PMID:23967200, PMID:23625833, PMID:27013197, PMID:26008967, PMID:29276151, PMID:28220902, PMID:38926506, PMID:31536594, PMID:21867693]. Its mRNA is additionally stabilized by m6A-dependent IGF2BP3 binding to promote cardiomyocyte proliferation and cardiac regeneration, and a functional 5A/6A promoter polymorphism tunes its expression level [PMID:37188676, PMID:15341739].","teleology":[{"year":1999,"claim":"Established that MMP3 is not merely an ECM-degrading enzyme but an active driver of malignant transformation, answering whether proteolytic activity alone could initiate cancer.","evidence":"Tetracycline-regulated MMP3 transgenic mice with TIMP1 co-expression rescue and in vivo tumor assays","pmids":["10428026"],"confidence":"High","gaps":["Identity of the TIMP1-sensitive substrate(s) initiating EMT not defined","Mechanism linking proteolysis to mesenchymal gene programs unresolved"]},{"year":2004,"claim":"Defined a functional cis-regulatory basis for inter-individual MMP3 expression by showing the 5A/6A promoter variant alters transcription factor binding and expression level.","evidence":"Population genetics with functional transcription factor binding assay and mRNA/protein quantification","pmids":["15341739"],"confidence":"Medium","gaps":["Identity of the differentially-bound transcription factor not specified","Physiological consequence of allele-specific expression not directly tested"]},{"year":2008,"claim":"Showed MMP3 is an amplifier of innate immune activation, placing it within an ROS→MMP3→NF-κB/AP-1/MAPK inflammatory loop in microglia rather than acting only on matrix.","evidence":"Pharmacological MMP-3 inhibition in primary and BV2 microglia with NF-κB/AP-1/MAPK and ROS assays","pmids":["18419763"],"confidence":"Medium","gaps":["Relies on pharmacological inhibition without genetic confirmation","Direct MMP3 substrate driving inflammatory signaling not identified"]},{"year":2008,"claim":"Demonstrated context-dependent tumor suppression by MMP3, showing that in keratinocytes it promotes differentiation and impedes tumor establishment, contrasting its mammary tumor-initiating role.","evidence":"Keratinocyte-targeted MMP3 transgenic mice, chemical carcinogenesis, and selective MMP3 inhibition in vitro","pmids":["18832569"],"confidence":"High","gaps":["Substrate underlying pro-differentiation effect unknown","Determinants of the tumor-promoting versus -suppressive switch not defined"]},{"year":2008,"claim":"Connected metabolic enzyme signaling to MMP3 induction by mapping an AMF/PGI→Src-RhoA-PI3K→AP-1 transcriptional cascade driving hepatoma migration.","evidence":"MMP3 promoter-luciferase reporter, signaling inhibitors, Src-RhoA-PI3K Co-IP, and migration assay","pmids":["18571835"],"confidence":"Medium","gaps":["Co-IP-defined complex not validated reciprocally or structurally","Direct AP-1 occupancy of the MMP3 promoter not shown"]},{"year":2013,"claim":"Identified FasL as a physiological MMP3 substrate and defined an ERα→MMP3→soluble FasL→osteoclast apoptosis axis linking estrogen to bone homeostasis.","evidence":"MMP3 siRNA, specific inhibitor, EGFP-FasL cleavage assay, ERαKO osteoblasts, and osteoclast co-culture","pmids":["22927007"],"confidence":"High","gaps":["Cleavage site within FasL not mapped","In vivo contribution to estrogen-dependent bone protection not isolated"]},{"year":2013,"claim":"Established direct transcriptional control of MMP3 by STAT3, showing phospho-STAT3 binds the MMP3 promoter to couple heme stress to endothelial apoptosis.","evidence":"ChIP, MMP3 promoter-luciferase reporter, qRT-PCR, and TUNEL in brain microvascular endothelial cells","pmids":["23967200"],"confidence":"High","gaps":["Single-cell-type context","MMP3 substrate mediating apoptosis not defined"]},{"year":2013,"claim":"Showed calcium-dependent NFATc3/calcineurin signaling directly drives MMP3 transcription in reactive astrocytes after injury, linking neural calcium signaling to matrix remodeling.","evidence":"Constitutively active NFATc3, calcium ionophore, MMP3 promoter-luciferase, cyclosporin A, and in vivo brain injury model","pmids":["23625833"],"confidence":"High","gaps":["Direct NFATc3 occupancy of endogenous promoter not shown by ChIP","Functional consequence of astrocytic MMP3 on scar tissue not isolated"]},{"year":2013,"claim":"Revealed a cell-type-specific function of MMP3 in mediating psychosine-induced transformation of microglia into globoid cells, relevant to lysosomal storage disease pathology.","evidence":"MMP-3 knockout mice, chemical inhibition in primary glia, and twitcher mouse immunohistochemistry","pmids":["23404611"],"confidence":"High","gaps":["Substrate driving multinucleation unknown","Reason for microglia-specific (versus macrophage) response unexplained"]},{"year":2014,"claim":"Mechanistically linked MMP3 to oncogenic signaling output by showing tumor-derived MMP3 induces Rac1b and primes the pancreatic stromal microenvironment alongside oncogenic KRAS.","evidence":"Human PDA cohort, KRAS/MMP3 transgenic mice, recombinant MMP3 treatment, invasion assays, transcriptional profiling","pmids":["24850902"],"confidence":"High","gaps":["Mechanism by which extracellular MMP3 induces a splice isoform not resolved","Proteolytic versus non-proteolytic contribution not separated"]},{"year":2014,"claim":"Placed MMP3 downstream of a HOXA10→TGFβ2→p38 cascade in pancreatic cancer invasion, adding a developmental transcription factor to its upstream regulators.","evidence":"HOXA10 knockdown/overexpression, TGFβ2 neutralization, p38 inhibitor, and invasion assays","pmids":["24464212"],"confidence":"Medium","gaps":["Direct transcriptional mechanism on MMP3 promoter not shown","Single lab without in vivo validation"]},{"year":2015,"claim":"Defined IRF8 as a direct transcriptional repressor of MMP3 and showed MMP3 is the effector of IRF8-loss-driven metastasis, establishing an inverse IRF8-MMP3 axis.","evidence":"IRF8 loss/gain, MMP3 siLencing epistasis, and orthotopic mammary carcinoma lung metastasis model","pmids":["26008967"],"confidence":"Medium","gaps":["Direct IRF8 promoter binding not demonstrated","Cell-intrinsic substrate driving metastasis unidentified"]},{"year":2016,"claim":"Established NFAT1 (NFATc2) as a direct positive transcriptional regulator of MMP3 promoting melanoma growth and metastasis, extending NFAT-family control of MMP3.","evidence":"NFAT1 silencing/overexpression/rescue, microarray, and in vivo tumor and metastasis models","pmids":["27013197"],"confidence":"Medium","gaps":["Direct promoter occupancy not shown","Single lab"]},{"year":2016,"claim":"Identified MMP3 as a TIMP4-reversible antiadipogenic factor with sex-dependent regulation, expanding its physiological roles into metabolic tissue.","evidence":"3T3-L1 overexpression, rhMMP3/rhTIMP4 treatment of human preadipocytes, enzymatic activity, and sex-stratified HFD mice","pmids":["27879248"],"confidence":"High","gaps":["Substrate mediating adipogenic blockade not identified","Basis of sex-dependent regulation unresolved"]},{"year":2017,"claim":"Defined a circadian/inflammatory repression mechanism in which BMAL1 normally restrains MMP3 transcription via control of NF-κB p65 phosphorylation, linking clock loss to skeletal pathology.","evidence":"BMAL1-deficient mice, RNA-seq, p65 phosphorylation Western blot, Mmp3 KO, and human patient samples","pmids":["29276151"],"confidence":"Medium","gaps":["Direct p65 occupancy of MMP3 promoter not shown","Single lab"]},{"year":2017,"claim":"Revealed an epigenetic mode of MMP3 activation in which TWIST1 acts indirectly through TET1-mediated 5hmC deposition at the MMP3 promoter rather than direct binding.","evidence":"TWIST1 transfection, promoter 5hmC mapping, TET1 induction, and Tet triple-KO fibroblasts with OA tissue context","pmids":["28220902"],"confidence":"High","gaps":["How 5hmC at the promoter mechanistically increases transcription not resolved","Transcription factor reading the demethylated promoter not identified"]},{"year":2019,"claim":"Defined an isoform-specific ERK1/ATF-2/MMP3 axis for IL-1β-induced MMP3 in dermal fibroblasts, resolving which ERK isoform couples to ATF-2.","evidence":"ERK1- and ERK2-specific siRNA, ERK and ATF-2 inhibitors, and phosphorylation Western blot","pmids":["31536594"],"confidence":"Medium","gaps":["Direct ATF-2 promoter binding not mapped","Single cell type"]},{"year":2019,"claim":"Established a Notch3→MMP-3 axis governing osteoblastic bone lesion phenotypes in prostate cancer metastasis, with MMP3 inhibition rescuing the phenotype.","evidence":"Notch3 gain/loss in tibia xenografts, MMP-3 inhibitor rescue, osteoblast/osteoclast differentiation assays, clinical samples","pmids":["31467432"],"confidence":"High","gaps":["Substrate mediating osteoblastogenesis not identified","Direct transcriptional mechanism downstream of Notch3 not shown"]},{"year":2020,"claim":"Separated intrinsic and extrinsic tumor functions of MMP3 by showing it sustains AKT/ERK growth signaling and tumor vascularization in prostate cancer.","evidence":"MMP-3 siRNA ablation, AKT/ERK Western blot, in vivo tumor growth, and endothelial tube formation","pmids":["32896761"],"confidence":"Medium","gaps":["Mechanism connecting secreted protease to intracellular AKT/ERK unresolved","Substrate driving angiogenesis not defined"]},{"year":2020,"claim":"Demonstrated that MMP3 protein can be transferred between tumor cells via extracellular vesicles to drive proliferation, a non-autonomous mode of tumor promotion.","evidence":"CRISPR/Cas9 MMP3 KO, 3D tumoroids, EV isolation and fluorescent transfer, and MMP3-enriched EV rescue","pmids":["32429403"],"confidence":"High","gaps":["Mechanism of MMP3 loading into EVs unknown","Whether EV-delivered MMP3 acts intra- or extracellularly not resolved"]},{"year":2021,"claim":"Positioned MMP3 as the effector of a GBP5→Src/ERK1/2 axis promoting glioblastoma proliferation and invasion.","evidence":"GBP5 overexpression/RNAi, in vitro invasion assays, in vivo GBM model, and pathway Western blots","pmids":["33608513"],"confidence":"Medium","gaps":["Direct transcriptional control of MMP3 not shown","Single lab"]},{"year":2022,"claim":"Identified decidual macrophages as the dominant MMP3 source and showed MMP3 degrades laminin and fibronectin to enable spiral artery remodeling in early pregnancy.","evidence":"Decidual macrophage conditioned medium, MMP array, immunohistochemistry, ex vivo chorionic plate artery model, and MMP3 inhibitor","pmids":["35176662"],"confidence":"Medium","gaps":["Direct in vivo requirement during human pregnancy not testable in this model","Trigger of macrophage MMP3 production not defined"]},{"year":2022,"claim":"Showed MMP3 restrains trabecular bone mass by promoting bone resorption, with a human promoter polymorphism tuning expression and BMD.","evidence":"Mmp3 KO mice, ovariectomy model, micro-CT, histomorphometry, promoter-luciferase reporter, and human cohort","pmids":["35949513"],"confidence":"Medium","gaps":["Molecular substrate driving resorption not identified","Mechanism linking MMP3 to osteoclast activity not resolved"]},{"year":2023,"claim":"Revealed post-transcriptional control of MMP3 via m6A-dependent IGF2BP3 mRNA stabilization, linking MMP3 to cardiomyocyte proliferation and cardiac regeneration.","evidence":"IGF2BP3 gain/loss in mice, MeRIP m6A binding, mRNA stability assays, and cardiac injury/regeneration model","pmids":["37188676"],"confidence":"High","gaps":["MMP3 substrate driving cardiomyocyte proliferation not identified","m6A site on MMP3 mRNA not mapped"]},{"year":2024,"claim":"Defined an epigenetic metastasis pathway in which KMT2C/D loss enables KDM6A-driven MMP3 upregulation to promote brain metastasis, providing a druggable axis.","evidence":"KMT2C/D KO mice, ChIP-seq for histone marks and KDM6A, KDM6A inhibition, Mmp3 siRNA, in vivo brain metastasis, and human TNBC","pmids":["38926506"],"confidence":"High","gaps":["Substrate mediating brain colonization not identified","How KDM6A is recruited specifically to the Mmp3 locus not resolved"]},{"year":2024,"claim":"Identified osteopontin as an MMP3 substrate and established MMP3 as a mediator of nanoparticle-induced lung inflammation and fibrosis.","evidence":"In vivo MMP-3 knockdown, Nano-CuO exposure, bronchoalveolar lavage, fibrosis staining, hydroxyproline, and cleaved OPN assay","pmids":["39030581"],"confidence":"Medium","gaps":["OPN cleavage site not mapped","Direct versus indirect contribution to fibrosis not fully separated"]},{"year":null,"claim":"The molecular determinants that switch MMP3 between tumor-promoting and tumor-suppressive behavior, and the specific physiological substrates underlying most of its non-cancer roles, remain undefined.","evidence":"No single discovery in the timeline reconciles the context-dependent and substrate-level mechanisms across tissues","pmids":[],"confidence":"Low","gaps":["Substrate repertoire largely uncharacterized beyond FasL, OPN, laminin, and fibronectin","Structural basis of substrate selection not addressed","Rules governing context-dependent oncogenic versus suppressive output unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,29,30]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[5,16,29]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,0]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[16,29,5]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[24]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[29,5,0]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,25,30]},{"term_id":"R-HSA-74160","term_label":"Gene expression 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Activates different molecules including growth factors, plasminogen or other matrix metalloproteinases such as MMP9 (PubMed:11029580, PubMed:1371271). Once released into the extracellular matrix (ECM), the inactive pro-enzyme is activated by the plasmin cascade signaling pathway (PubMed:2383557). Also acts intracellularly (PubMed:22265821). For example, in dopaminergic neurons, gets activated by the serine protease HTRA2 upon stress and plays a pivotal role in DA neuronal degeneration by mediating microglial activation and alpha-synuclein/SNCA cleavage (PubMed:21330369). In addition, plays a role in immune response and possesses antiviral activity against various viruses such as vesicular stomatitis virus, influenza A virus (H1N1) and human herpes virus 1 (PubMed:35940311). Mechanistically, translocates from the cytoplasm into the cell nucleus upon virus infection to influence NF-kappa-B activities (PubMed:35940311)","subcellular_location":"Secreted, extracellular space, extracellular matrix; Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P08254/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MMP3","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/MMP3","total_profiled":1310},"omim":[{"mim_id":"614466","title":"CORONARY HEART DISEASE, SUSCEPTIBILITY TO, 6; CHDS6","url":"https://www.omim.org/entry/614466"},{"mim_id":"609951","title":"ZINC FINGER PROTEIN 384; ZNF384","url":"https://www.omim.org/entry/609951"},{"mim_id":"608482","title":"MATRIX METALLOPROTEINASE 25; MMP25","url":"https://www.omim.org/entry/608482"},{"mim_id":"607339","title":"CORONARY HEART DISEASE, SUSCEPTIBILITY TO, 1","url":"https://www.omim.org/entry/607339"},{"mim_id":"605470","title":"MATRIX METALLOPROTEINASE 26; MMP26","url":"https://www.omim.org/entry/605470"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":99.1},{"tissue":"salivary gland","ntpm":285.6},{"tissue":"skin 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Cross-talk exists between ROS and MMP-3, with ROS acting as an early signaling inducer upstream of MMP-3 induction.\",\n      \"method\": \"Pharmacological MMP inhibition in primary cultured microglia and BV2 microglial cells; NF-κB/AP-1/MAPK activity assays; ROS inhibition experiments\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal inhibitor approaches in two cell systems, single lab\",\n      \"pmids\": [\"18419763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ERα signaling in osteoblasts upregulates MMP3 expression, and MMP3 then cleaves and solubilizes osteoblast-expressed FasL; soluble FasL drives osteoclast apoptosis. Specific MMP3 inhibition or MMP3 siRNA knockdown blocks FasL cleavage and prevents E2-induced osteoclast apoptosis, establishing a ERα→MMP3→FasL cleavage→osteoclast apoptosis axis.\",\n      \"method\": \"MMP3 siRNA knockdown; specific MMP3 inhibitor; EGFP-FasL fluorescence cleavage assay; conditioned media experiments; calvarial organ cultures; ERαKO mouse osteoblasts; osteoclast–osteoblast co-culture\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (siRNA, chemical inhibitor, KO mouse cells, co-culture) in a single focused mechanistic study\",\n      \"pmids\": [\"22927007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Tumor cell-derived MMP3 stimulates expression of Rac1b (a tumorigenic splice isoform of Rac1) in pancreatic cancer cells, increases cellular invasiveness, and activates tumorigenic transcriptional profiles. In transgenic mice, MMP3 co-expression with activated KRAS in pancreatic acinar cells stimulates metaplasia and immune cell infiltration, priming the stromal microenvironment.\",\n      \"method\": \"Human PDA tissue cohort analysis; transgenic mouse models; recombinant MMP3 treatment of cultured pancreatic cancer cells; invasion assays; transcriptional profiling\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic model plus in vitro recombinant protein treatment, human tissue correlation, multiple orthogonal approaches\",\n      \"pmids\": [\"24850902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NFAT1 (NFATc2) directly transcriptionally regulates MMP3 expression in melanoma cells; NFAT1 depletion reduces MMP3 expression, NFAT1 overexpression induces it, and restoration of NFAT1 recovers MMP3 to baseline. MMP3 promotes melanoma tumor growth and lung metastasis in vivo.\",\n      \"method\": \"Stable NFAT1 silencing; microarray; NFAT1 overexpression/rescue experiments; in vivo tumor and metastasis models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss/rescue experiments plus in vivo validation, single lab\",\n      \"pmids\": [\"27013197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Decreased MMP-3 activity is detected in glaucomatous aqueous humor compared to controls. AAV-mediated MMP-3 expression in corneal endothelium increases aqueous humor MMP-3 concentration and activity, increases outflow facility, and decreases intraocular pressure in mice. MMP-3 remodels extracellular matrix components in the trabecular meshwork/Schlemm's canal pathway.\",\n      \"method\": \"AAV-2/9 intracameral inoculation; MMP-3 enzymatic activity assay; intraocular pressure measurement; transendothelial resistance assay; transmission electron microscopy of matrix remodeling\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vivo AAV gene delivery with functional IOP readout, biochemical activity assay, ultrastructural analysis, and ex vivo cell monolayer assays\",\n      \"pmids\": [\"28158775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A single base pair insertion/deletion variant in the MMP3 promoter (5A/6A, located 1608 bp from the transcription start site) alters transcription factor binding and influences levels of MMP3 mRNA and protein, with the 5A allele associated with higher expression. Positive selection increased the frequency of the high-expression (5A) allele in European populations approximately 24,000 years ago.\",\n      \"method\": \"Phylogenetic and population genetic analysis; functional transcription factor binding assay; mRNA/protein quantification\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional promoter binding assay combined with population genetics; single lab\",\n      \"pmids\": [\"15341739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Psychosine (galactosylsphingosine) induces MMP-3 expression and production in primary microglia, and MMP-3 mediates morphological transformation of microglia into multinucleated globoid cells. Genetic ablation or chemical inhibition of MMP-3 prevents psychosine-induced globoid cell formation. This process is microglia-specific; peripheral macrophages do not respond similarly.\",\n      \"method\": \"MMP-3 knockout mice; chemical MMP-3 inhibition; primary glial cultures; psychosine treatment; immunohistochemistry in twitcher mice\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus chemical inhibitor in primary cells, with in vivo disease model validation\",\n      \"pmids\": [\"23404611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Phosphorylated STAT3 directly binds to the MMP3 promoter in human brain microvascular endothelial cells and transcriptionally activates MMP3 expression. Heme-induced STAT3 activation leads to MMP3 upregulation and contributes to endothelial cell apoptosis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP); luciferase reporter assay with MMP3 promoter construct; qRT-PCR; Western blot; TUNEL apoptosis assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct ChIP demonstrating STAT3 binding to MMP3 promoter, confirmed by promoter-luciferase reporter, single lab\",\n      \"pmids\": [\"23967200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NFATc3 directly regulates MMP3 transcription in astrocytes in a calcium/calcineurin-dependent manner. Constitutively active NFATc3 induces Mmp3 expression; calcium ionophore and ATP stimulation increase Mmp3 mRNA and protein; calcineurin inhibitor cyclosporin A prevents this. An MMP3 promoter-luciferase reporter was activated by increased intracellular Ca2+. In vivo, MMP3 is expressed in NFATc3-positive scar-forming astrocytes after brain injury.\",\n      \"method\": \"Constitutively active NFATc3 overexpression; calcium ionophore treatment; MMP3 promoter-luciferase reporter assay; calcineurin inhibitor (CsA) treatment; in vivo stab-wound brain injury model; immunohistochemistry\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — promoter-reporter assay, gain-of-function, pharmacological inhibition, and in vivo validation in single focused study\",\n      \"pmids\": [\"23625833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AMF/PGI transactivates the MMP-3 gene promoter through AP-1 via the Src-RhoA-PI3-kinase signaling pathway to induce hepatoma cell migration. The three signaling molecules Src, RhoA, and PI3-kinase form a complex, and MMP-3 induction correlates with AMF/PGI enzymatic activity.\",\n      \"method\": \"MMP-3 promoter-luciferase reporter assay; signaling pathway inhibitors; co-immunoprecipitation of Src-RhoA-PI3K complex; cell migration assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter with Co-IP and functional migration assay, single lab\",\n      \"pmids\": [\"18571835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Keratinocyte expression of MMP3 promotes cellular differentiation and impedes tumor establishment; MMP3-expressing papilloma cell lines lost capacity to form palpable tumors in vivo and showed increased differentiation in vitro; this differentiation effect was inhibited by broad-spectrum MMP inhibitors and selective MMP3 inhibition.\",\n      \"method\": \"Transgenic mice with keratinocyte-targeted MMP3; chemical carcinogenesis model; orthotopic injection of stable MMP3-expressing cell lines; in vitro differentiation assays with MMP3 inhibition\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transgenic gain-of-function plus cell line experiments with selective MMP3 inhibition in both in vivo and in vitro settings\",\n      \"pmids\": [\"18832569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ERK1 and ERK2 each regulate IL-1β-induced MMP3 (and MMP13) expression in human chondrocytes; knockdown of either ERK1 or ERK2 alone significantly reduces IL-1β-induced MMP3 protein and mRNA, and combined knockdown has synergistic suppression. No compensatory upregulation of the opposing isoform occurs.\",\n      \"method\": \"Specific siRNA knockdown of ERK1, ERK2, or both; IL-1β stimulation; quantitative RT-PCR; ELISA; Western blot\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific siRNA knockdowns with multiple readouts, single lab\",\n      \"pmids\": [\"21305249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Protein kinase D1 (PKD1) mediates synergistic MMP-3 expression induced by TNF-α and bradykinin in human colonic myofibroblasts. siRNA targeting PKD1 completely inhibited MMP-3 mRNA and protein expression; the signaling cascade involves PKC, PKD1, and MEK acting at the transcriptional level.\",\n      \"method\": \"PKD1 siRNA knockdown; PKC inhibitors (GF109203X, Go6983); MEK inhibitor (U0126); MMP-3 mRNA and protein quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus multiple pharmacological inhibitors, single lab\",\n      \"pmids\": [\"21867693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Substance P stimulates MMP3 expression and protein production in human tenocytes via the neurokinin-1 receptor (NK-1R). Gene expression analysis showed SP-induced increases in MMP3, COL3A1, and ACTA2 mRNA in 3D collagen lattices. Cyclic tensile loading together with SP had an additive effect on MMP3 expression. Immunoblotting confirmed NK-1R mediation of MMP3 protein upregulation.\",\n      \"method\": \"3D collagen lattice culture; NK-1R-mediated signaling experiments; gene expression analysis; cyclic tensile loading; immunoblotting\",\n      \"journal\": \"Journal of orthopaedic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — receptor-specific pharmacology with multiple readouts including 3D culture and mechanical loading, single lab\",\n      \"pmids\": [\"22836729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HOXA10 promotes MMP-3 expression and pancreatic cancer cell invasion via a TGFβ2-p38 MAPK pathway. Knockdown of HOXA10 decreases TGFβ2 and MMP-3 and suppresses p38 activation; TGFβ2 neutralization blocks HOXA10-driven MMP-3 induction; p38 inhibition suppresses MMP-3 expression and invasion.\",\n      \"method\": \"HOXA10 knockdown and overexpression; TGFβ2 neutralizing antibody; p38 inhibitor (SB239063); invasion and migration assays; Western blot\",\n      \"journal\": \"Digestive diseases and sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple perturbations (KD, OE, pathway inhibitors) in a single lab\",\n      \"pmids\": [\"24464212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MMP3 overexpression in preadipocytes (3T3-L1) inhibits adipogenic differentiation; recombinant human MMP3 added to primary human preadipocytes inhibits differentiation; recombinant TIMP4 rescues adipogenesis and attenuates MMP3's inhibitory effect. In male mice, high-fat diet-induced obesity increases MMP3 protein and enzymatic activity, whereas in females it decreases MMP3 protein. These data establish MMP3 as an antiadipogenic factor regulated sex-dependently.\",\n      \"method\": \"Mmp3 overexpression in 3T3-L1 preadipocytes; rhMMP3 and rhTIMP4 treatment of primary human preadipocytes; enzymatic activity assays; protein quantification; sex-stratified HFD mouse model\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches including recombinant protein rescue, gain-of-function, and in vivo mouse model with enzymatic activity readouts\",\n      \"pmids\": [\"27879248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BMAL1 deficiency enhances Mmp3 transcription through activating p65 (NF-κB) phosphorylation. Mmp3 KO mice show reduced mandibular hypoplasia, and MMP3 is elevated in BMAL1-deficient mice and juvenile patients with skeletal mandibular hypoplasia, establishing BMAL1 as a transcriptional repressor of MMP3 via NF-κB p65.\",\n      \"method\": \"BMAL1-deficient mice; RNA sequencing; protein chip analysis; Western blot for p65 phosphorylation; immunohistochemistry; human patient samples\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO model with mechanistic p65 phosphorylation readout and human tissue validation, single lab\",\n      \"pmids\": [\"29276151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IRF8 directly transcriptionally represses MMP3, forming an inverse IRF8-MMP3 axis. Growth advantage from IRF8 loss is significantly compromised after MMP3 silencing. MMP3 loss reduces spontaneous lung metastasis in an orthotopic mouse mammary carcinoma model and acts in a cell-intrinsic manner.\",\n      \"method\": \"Gene expression profiling; IRF8 loss/gain experiments; MMP3 siRNA silencing in IRF8-deficient tumors; orthotopic mammary carcinoma mouse model; lung metastasis quantification\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis (IRF8 KO rescued by MMP3 KD), in vivo metastasis model, single lab\",\n      \"pmids\": [\"26008967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A bacterial ligand of integrin α5β1 (protein I/II from oral streptococci) induces upregulation of MMP-3 gene expression and increased pro-MMP-3 release in rheumatoid arthritis fibroblast-like synoviocytes (RA FLSs), but not in osteoarthritis FLSs, suggesting integrin α5β1-mediated MMP-3 induction contributes to RA joint destruction.\",\n      \"method\": \"Human cancer cDNA expression arrays; RT-PCR; pro-MMP-3 assay on conditioned media from RA FLSs treated with protein I/II\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — transcriptional array confirmed by RT-PCR and secretion assay, disease-specificity comparison, single lab\",\n      \"pmids\": [\"15642131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Eotaxin-1 (CCL11) induces MMP-3 mRNA expression and protein secretion in human chondrocytes through G protein-coupled receptor activities. ERK and p38 kinase inhibitors repress eotaxin-1-induced MMP-3 expression, while cAMP/PKA antagonism enhances it. MMP-3 protein secretion is regulated specifically by PLC-PKC cascade and JNK/MAPK pathways downstream of eotaxin-1 receptor.\",\n      \"method\": \"ERK, p38, PKA, PLC-PKC, and JNK pathway inhibitors; dose-response experiments; MMP-3 mRNA quantification; ELISA of secreted MMP-3; primary chondrocytes and SW1353 cell line\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple pharmacological inhibitors dissecting expression vs. secretion, single lab\",\n      \"pmids\": [\"22114952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MMP3 promoter polymorphisms (rs522616 and rs3025058) are functional: the rs522616 A allele binds a specific DNA-protein complex and shows greater promoter activity than the G allele, but the ultimate effect is regulated by the rs3025058 background allele. For TIMP2 rs8179096, the T allele shows ~2.5-fold increased promoter activity versus C, and both alleles bind NF-κB.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA) for DNA-protein complex; promoter-luciferase reporter assays; allele-specific transfection experiments\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — promoter-reporter and EMSA are direct functional assays, but single lab and limited to two polymorphisms\",\n      \"pmids\": [\"24799419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Notch3 (NICD3) expression in prostate cancer cells elevates MMP-3 secretion, and inhibition of MMP-3 rescues NICD3-induced osteoblastic bone lesion phenotypes. Active Notch3 reduces osteolytic lesion area and enhances osteoblastogenesis while inhibiting osteoclastogenesis, and this is mediated through MMP-3, defining a Notch3-MMP-3 axis in bone metastasis.\",\n      \"method\": \"Notch3 gain/loss-of-function in mouse tibia xenografts; MMP-3 inhibition rescue experiments; conditioned medium osteoblast/osteoclast differentiation assays; clinical osteoblastic metastasis samples\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic manipulation in vivo, pharmacological rescue with MMP-3 inhibitor, functional in vitro assays, and human tissue validation\",\n      \"pmids\": [\"31467432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MMP3 ablation in prostate cancer cells reduces in vitro cell growth with decreased AKT and ERK phosphorylation and lower VEGFR1 and FGFR3 protein levels. In vivo, MMP-3-ablated tumors grow slower and are less vascularized. MMP-3 in conditioned media supports endothelial tube formation, establishing intrinsic (growth signaling) and extrinsic (angiogenesis) roles for tumor-derived MMP-3.\",\n      \"method\": \"MMP-3 siRNA ablation; in vitro growth assay; AKT/ERK phosphorylation Western blot; in vivo tumor growth; endothelial tube formation assay; qPCR for angiogenic factors\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combined in vivo and in vitro loss-of-function with multiple signaling readouts, single lab\",\n      \"pmids\": [\"32896761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MMP3 knockout (by CRISPR/Cas9) in tumor cells reduces tumoroid size, promotes necrosis within tumoroids, and causes additional release of broken EVs. MMP3-rich EVs from wild-type tumoroids can rescue MMP3-KO tumoroid growth, whereas MMP3-null EVs cannot, demonstrating that EV-mediated transfer of MMP3 protein promotes tumor cell proliferation and tumorigenesis.\",\n      \"method\": \"CRISPR/Cas9 MMP3 knockout; 3D tumoroid culture; EV isolation and characterization; fluorescent EV transfer assay; conditioned medium rescue experiments; Ki-67 proliferation marker\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO with rescue by MMP3-enriched EVs in 3D model, multiple orthogonal methods\",\n      \"pmids\": [\"32429403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of KMT2C or KMT2D (H3K4 methyltransferases) leads to epigenetic upregulation of MMP3 via enhanced KDM6A (H3K27me3 demethylase) binding at the Mmp3 locus, associated with altered H3K4me1, H3K27ac, and H3K27me3 marks. Pharmacological KDM6A inhibition or direct MMP3 downregulation prevents brain metastasis in TNBC models, establishing a KMT2C/D loss → KDM6A → MMP3 → brain metastasis axis.\",\n      \"method\": \"KMT2C/D knockout mouse models; global chromatin profiling (ChIP-seq for H3K4me1, H3K27ac, H3K27me3); KDM6A ChIP-seq; KDM6A pharmacological inhibition; Mmp3 siRNA knockdown; in vivo brain metastasis assays; human KMT2C-mutant TNBC samples\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP-seq epigenomic profiling, in vivo genetic models, pharmacological validation, and human tissue confirmation in a single rigorous study\",\n      \"pmids\": [\"38926506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"IGF2BP3 binds and stabilizes MMP3 mRNA through interaction with N6-methyladenosine (m6A) modification, upregulating MMP3 protein expression. MMP3 acts downstream of IGF2BP3 to regulate cardiomyocyte proliferation and cardiac regeneration after myocardial infarction in mice.\",\n      \"method\": \"IGF2BP3 gain/loss-of-function in mice; m6A binding assay (MeRIP); mRNA stability experiments; cardiac injury model; cardiomyocyte proliferation assay; functional cardiac assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — m6A RNA binding biochemistry plus in vivo gain/loss-of-function with functional cardiac readout, single lab\",\n      \"pmids\": [\"37188676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ERK1 (but not ERK2) phosphorylates ATF-2, which then directly contributes to IL-1β-induced MMP-3 mRNA expression in dermal fibroblasts. ERK inhibitor blocks both ATF-2 phosphorylation and MMP-3 induction; ERK1 siRNA reduces ATF-2 phosphorylation and MMP-3 expression, but ERK2 siRNA does not affect ATF-2 phosphorylation, defining an isoform-specific ERK1/ATF-2/MMP-3 axis.\",\n      \"method\": \"ERK1 and ERK2 specific siRNA knockdown; ERK inhibitor (FR180204); ATF-2 siRNA and inhibitor; phosphorylation Western blot; MMP-3 mRNA quantification\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific siRNA combined with phosphorylation readout, single lab\",\n      \"pmids\": [\"31536594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TWIST1 upregulates MMP3 expression in chondrocytes without directly binding the MMP3 promoter; instead, TWIST1 increases 5-hydroxymethylcytosine (5hmC) levels at the MMP3 promoter by inducing TET1 expression. TWIST1-dependent Mmp3 upregulation is suppressed in Tet triple KO fibroblasts, establishing a TWIST1→TET1→5hmC(MMP3 promoter)→MMP3 epigenetic regulatory axis.\",\n      \"method\": \"TWIST1 stable transfection; 5hmC chromatin analysis at MMP3 promoter; TET1/2/3 expression analysis; Tet triple KO fibroblasts from mouse ES cells; human OA and normal cartilage tissue comparison\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — epigenetic mechanism with promoter 5hmC mapping, TET family KO validation, and human tissue context\",\n      \"pmids\": [\"28220902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Decidual macrophages are the predominant source of MMP3 in the first-trimester decidua. Decidual macrophage conditioned medium facilitates breakdown of laminin and fibronectin in a chorionic plate artery model of spiral artery remodeling, and this effect is abrogated by a MMP3 inhibitor, establishing MMP3 from decidual macrophages as a key mediator of extracellular matrix breakdown in spiral artery remodeling during early pregnancy.\",\n      \"method\": \"Decidual macrophage isolation and conditioned medium preparation; MMP membrane array; immunohistochemistry co-localization; chorionic plate artery ex vivo model; MMP3 inhibitor; fibronectin/laminin quantification (quickscore)\",\n      \"journal\": \"Journal of reproductive immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MMP3 inhibitor rescue in an ex vivo vascular remodeling model with cell-type localization, single lab\",\n      \"pmids\": [\"35176662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MMP-3 mediates copper oxide nanoparticle (Nano-CuO)-induced pulmonary inflammation and fibrosis: Nano-CuO exposure induces MMP-3 overexpression and secretion in mouse lungs; MMP-3 knockdown significantly attenuates Nano-CuO-induced acute and chronic lung inflammation, injury, and fibrosis. MMP-3 also mediates Nano-CuO-induced cleavage of osteopontin (OPN), and MMP-3 knockdown reduces cleaved OPN levels.\",\n      \"method\": \"In vivo MMP-3 knockdown in mouse lungs; Nano-CuO exposure; bronchoalveolar lavage analysis; H&E and Trichrome staining; hydroxyproline content measurement; cleaved OPN assay\",\n      \"journal\": \"Journal of nanobiotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo MMP-3 knockdown with multiple disease readouts and OPN substrate cleavage, single lab\",\n      \"pmids\": [\"39030581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GBP5 promotes glioblastoma cell proliferation, migration, and invasion through the Src/ERK1/2/MMP3 signaling axis; GBP5 overexpression upregulates MMP3 and Src/ERK1/2 activation, while silencing GBP5 by RNA interference has opposite effects and impairs tumor growth in vivo.\",\n      \"method\": \"GBP5 overexpression and RNA interference; in vitro proliferation, migration, invasion assays; in vivo GBM tumor model; Src/ERK1/2/MMP3 pathway analysis by Western blot\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with in vivo validation and pathway characterization, single lab\",\n      \"pmids\": [\"33608513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MMP3 knockout in mice significantly increases trabecular bone mass and trabecular number, and protects from ovariectomy-induced bone loss by inhibiting bone resorption rather than affecting bone formation. In humans, a MMP3 promoter polymorphism (rs632478) is associated with bone mineral density and affects promoter activity in transfection experiments.\",\n      \"method\": \"Mmp3 KO mice; ovariectomy model; micro-CT bone microarchitecture analysis; bone histomorphometry; promoter-luciferase reporter assay; human cohort analysis\",\n      \"journal\": \"FASEB bioAdvances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with specific bone resorption readouts and functional promoter assay, single lab\",\n      \"pmids\": [\"35949513\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MMP3 (stromelysin-1) is a secreted matrix metalloproteinase that degrades multiple ECM components (collagens, fibronectin, laminin, proteoglycans) and activates other MMPs; its expression is transcriptionally regulated by multiple pathways including STAT3 (direct promoter binding), NFATc3/calcineurin (calcium-dependent), NFAT1, ERα, BMAL1/NF-κB, TWIST1/TET1-mediated DNA hydroxymethylation, and KMT2C/D–KDM6A epigenetic control; signaling cascades including ERK1/ATF-2, Src-RhoA-PI3K/AP-1, p38/JNK MAPK, PKC/PKD1/MEK, and PI3K/Akt/FOXO3 modulate its expression and secretion; MMP3 drives epithelial-to-mesenchymal transition and tumor initiation/metastasis partly through induction of Rac1b; it cleaves FasL to generate soluble FasL that triggers osteoclast apoptosis downstream of ERα signaling; it stabilizes its own mRNA via m6A-dependent IGF2BP3 binding to promote cardiomyocyte regeneration; it acts as an antiadipogenic factor, a regulator of aqueous humor outflow facility and intraocular pressure, a mediator of microglial globoid cell formation, and a contributor to spiral artery remodeling in pregnancy, collectively establishing MMP3 as a multifunctional extracellular protease whose activity is context-dependently tumor-promoting or tumor-suppressive depending on cell type and tissue context.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MMP3 (stromelysin-1) is a secreted, TIMP-sensitive extracellular metalloprotease that remodels extracellular matrix and processes signaling substrates to drive tissue remodeling, inflammation, and tumor progression across many cell types [#0, #29]. In epithelial systems it is a potent inducer of epithelial-to-mesenchymal transition and tumor initiation, an activity blocked by TIMP1 co-expression, and it amplifies invasive and metastatic programs in part by stimulating the tumorigenic Rac1b splice isoform in pancreatic cancer cells [#0, #3]. MMP3 supports tumor cell-intrinsic growth signaling (AKT/ERK phosphorylation) and extrinsic angiogenesis, can be transferred between tumor cells via extracellular vesicles to promote proliferation, and mediates organ-specific metastasis such as brain colonization downstream of KMT2C/D loss and Notch3-driven osteoblastic bone lesions [#22, #23, #24, #25]. Its substrate repertoire includes structural ECM proteins laminin and fibronectin during spiral artery remodeling, FasL (whose cleavage releases soluble FasL to trigger osteoclast apoptosis downstream of ERα), and osteopontin in nanoparticle-induced lung injury [#29, #2, #30]. Beyond cancer, MMP3 acts as an inflammatory mediator in activated microglia and drives psychosine-induced microglial globoid cell formation, functions as an antiadipogenic factor reversible by TIMP4, regulates aqueous humor outflow and intraocular pressure through trabecular meshwork matrix remodeling, and restrains trabecular bone mass by promoting bone resorption [#1, #7, #16, #5, #32]. MMP3 transcription is a heavily integrated node: it is directly activated by STAT3, NFATc3 (calcium/calcineurin-dependent), and NFAT1, repressed by IRF8 and by BMAL1 acting through NF-κB p65, induced epigenetically via TWIST1→TET1→5hmC and via KMT2C/D loss→KDM6A, and converges on multiple MAPK cascades including isoform-specific ERK1/ATF-2 and PKC/PKD1/MEK signaling [#8, #9, #4, #18, #17, #28, #25, #27, #13]. Its mRNA is additionally stabilized by m6A-dependent IGF2BP3 binding to promote cardiomyocyte proliferation and cardiac regeneration, and a functional 5A/6A promoter polymorphism tunes its expression level [#26, #6].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that MMP3 is not merely an ECM-degrading enzyme but an active driver of malignant transformation, answering whether proteolytic activity alone could initiate cancer.\",\n      \"evidence\": \"Tetracycline-regulated MMP3 transgenic mice with TIMP1 co-expression rescue and in vivo tumor assays\",\n      \"pmids\": [\"10428026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the TIMP1-sensitive substrate(s) initiating EMT not defined\", \"Mechanism linking proteolysis to mesenchymal gene programs unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined a functional cis-regulatory basis for inter-individual MMP3 expression by showing the 5A/6A promoter variant alters transcription factor binding and expression level.\",\n      \"evidence\": \"Population genetics with functional transcription factor binding assay and mRNA/protein quantification\",\n      \"pmids\": [\"15341739\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the differentially-bound transcription factor not specified\", \"Physiological consequence of allele-specific expression not directly tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed MMP3 is an amplifier of innate immune activation, placing it within an ROS→MMP3→NF-κB/AP-1/MAPK inflammatory loop in microglia rather than acting only on matrix.\",\n      \"evidence\": \"Pharmacological MMP-3 inhibition in primary and BV2 microglia with NF-κB/AP-1/MAPK and ROS assays\",\n      \"pmids\": [\"18419763\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relies on pharmacological inhibition without genetic confirmation\", \"Direct MMP3 substrate driving inflammatory signaling not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated context-dependent tumor suppression by MMP3, showing that in keratinocytes it promotes differentiation and impedes tumor establishment, contrasting its mammary tumor-initiating role.\",\n      \"evidence\": \"Keratinocyte-targeted MMP3 transgenic mice, chemical carcinogenesis, and selective MMP3 inhibition in vitro\",\n      \"pmids\": [\"18832569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate underlying pro-differentiation effect unknown\", \"Determinants of the tumor-promoting versus -suppressive switch not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected metabolic enzyme signaling to MMP3 induction by mapping an AMF/PGI→Src-RhoA-PI3K→AP-1 transcriptional cascade driving hepatoma migration.\",\n      \"evidence\": \"MMP3 promoter-luciferase reporter, signaling inhibitors, Src-RhoA-PI3K Co-IP, and migration assay\",\n      \"pmids\": [\"18571835\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Co-IP-defined complex not validated reciprocally or structurally\", \"Direct AP-1 occupancy of the MMP3 promoter not shown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified FasL as a physiological MMP3 substrate and defined an ERα→MMP3→soluble FasL→osteoclast apoptosis axis linking estrogen to bone homeostasis.\",\n      \"evidence\": \"MMP3 siRNA, specific inhibitor, EGFP-FasL cleavage assay, ERαKO osteoblasts, and osteoclast co-culture\",\n      \"pmids\": [\"22927007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cleavage site within FasL not mapped\", \"In vivo contribution to estrogen-dependent bone protection not isolated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established direct transcriptional control of MMP3 by STAT3, showing phospho-STAT3 binds the MMP3 promoter to couple heme stress to endothelial apoptosis.\",\n      \"evidence\": \"ChIP, MMP3 promoter-luciferase reporter, qRT-PCR, and TUNEL in brain microvascular endothelial cells\",\n      \"pmids\": [\"23967200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-cell-type context\", \"MMP3 substrate mediating apoptosis not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed calcium-dependent NFATc3/calcineurin signaling directly drives MMP3 transcription in reactive astrocytes after injury, linking neural calcium signaling to matrix remodeling.\",\n      \"evidence\": \"Constitutively active NFATc3, calcium ionophore, MMP3 promoter-luciferase, cyclosporin A, and in vivo brain injury model\",\n      \"pmids\": [\"23625833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct NFATc3 occupancy of endogenous promoter not shown by ChIP\", \"Functional consequence of astrocytic MMP3 on scar tissue not isolated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed a cell-type-specific function of MMP3 in mediating psychosine-induced transformation of microglia into globoid cells, relevant to lysosomal storage disease pathology.\",\n      \"evidence\": \"MMP-3 knockout mice, chemical inhibition in primary glia, and twitcher mouse immunohistochemistry\",\n      \"pmids\": [\"23404611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate driving multinucleation unknown\", \"Reason for microglia-specific (versus macrophage) response unexplained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mechanistically linked MMP3 to oncogenic signaling output by showing tumor-derived MMP3 induces Rac1b and primes the pancreatic stromal microenvironment alongside oncogenic KRAS.\",\n      \"evidence\": \"Human PDA cohort, KRAS/MMP3 transgenic mice, recombinant MMP3 treatment, invasion assays, transcriptional profiling\",\n      \"pmids\": [\"24850902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which extracellular MMP3 induces a splice isoform not resolved\", \"Proteolytic versus non-proteolytic contribution not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed MMP3 downstream of a HOXA10→TGFβ2→p38 cascade in pancreatic cancer invasion, adding a developmental transcription factor to its upstream regulators.\",\n      \"evidence\": \"HOXA10 knockdown/overexpression, TGFβ2 neutralization, p38 inhibitor, and invasion assays\",\n      \"pmids\": [\"24464212\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional mechanism on MMP3 promoter not shown\", \"Single lab without in vivo validation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined IRF8 as a direct transcriptional repressor of MMP3 and showed MMP3 is the effector of IRF8-loss-driven metastasis, establishing an inverse IRF8-MMP3 axis.\",\n      \"evidence\": \"IRF8 loss/gain, MMP3 siLencing epistasis, and orthotopic mammary carcinoma lung metastasis model\",\n      \"pmids\": [\"26008967\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct IRF8 promoter binding not demonstrated\", \"Cell-intrinsic substrate driving metastasis unidentified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established NFAT1 (NFATc2) as a direct positive transcriptional regulator of MMP3 promoting melanoma growth and metastasis, extending NFAT-family control of MMP3.\",\n      \"evidence\": \"NFAT1 silencing/overexpression/rescue, microarray, and in vivo tumor and metastasis models\",\n      \"pmids\": [\"27013197\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter occupancy not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified MMP3 as a TIMP4-reversible antiadipogenic factor with sex-dependent regulation, expanding its physiological roles into metabolic tissue.\",\n      \"evidence\": \"3T3-L1 overexpression, rhMMP3/rhTIMP4 treatment of human preadipocytes, enzymatic activity, and sex-stratified HFD mice\",\n      \"pmids\": [\"27879248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate mediating adipogenic blockade not identified\", \"Basis of sex-dependent regulation unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a circadian/inflammatory repression mechanism in which BMAL1 normally restrains MMP3 transcription via control of NF-κB p65 phosphorylation, linking clock loss to skeletal pathology.\",\n      \"evidence\": \"BMAL1-deficient mice, RNA-seq, p65 phosphorylation Western blot, Mmp3 KO, and human patient samples\",\n      \"pmids\": [\"29276151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct p65 occupancy of MMP3 promoter not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed an epigenetic mode of MMP3 activation in which TWIST1 acts indirectly through TET1-mediated 5hmC deposition at the MMP3 promoter rather than direct binding.\",\n      \"evidence\": \"TWIST1 transfection, promoter 5hmC mapping, TET1 induction, and Tet triple-KO fibroblasts with OA tissue context\",\n      \"pmids\": [\"28220902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How 5hmC at the promoter mechanistically increases transcription not resolved\", \"Transcription factor reading the demethylated promoter not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined an isoform-specific ERK1/ATF-2/MMP3 axis for IL-1β-induced MMP3 in dermal fibroblasts, resolving which ERK isoform couples to ATF-2.\",\n      \"evidence\": \"ERK1- and ERK2-specific siRNA, ERK and ATF-2 inhibitors, and phosphorylation Western blot\",\n      \"pmids\": [\"31536594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ATF-2 promoter binding not mapped\", \"Single cell type\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established a Notch3→MMP-3 axis governing osteoblastic bone lesion phenotypes in prostate cancer metastasis, with MMP3 inhibition rescuing the phenotype.\",\n      \"evidence\": \"Notch3 gain/loss in tibia xenografts, MMP-3 inhibitor rescue, osteoblast/osteoclast differentiation assays, clinical samples\",\n      \"pmids\": [\"31467432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate mediating osteoblastogenesis not identified\", \"Direct transcriptional mechanism downstream of Notch3 not shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Separated intrinsic and extrinsic tumor functions of MMP3 by showing it sustains AKT/ERK growth signaling and tumor vascularization in prostate cancer.\",\n      \"evidence\": \"MMP-3 siRNA ablation, AKT/ERK Western blot, in vivo tumor growth, and endothelial tube formation\",\n      \"pmids\": [\"32896761\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting secreted protease to intracellular AKT/ERK unresolved\", \"Substrate driving angiogenesis not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that MMP3 protein can be transferred between tumor cells via extracellular vesicles to drive proliferation, a non-autonomous mode of tumor promotion.\",\n      \"evidence\": \"CRISPR/Cas9 MMP3 KO, 3D tumoroids, EV isolation and fluorescent transfer, and MMP3-enriched EV rescue\",\n      \"pmids\": [\"32429403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of MMP3 loading into EVs unknown\", \"Whether EV-delivered MMP3 acts intra- or extracellularly not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Positioned MMP3 as the effector of a GBP5→Src/ERK1/2 axis promoting glioblastoma proliferation and invasion.\",\n      \"evidence\": \"GBP5 overexpression/RNAi, in vitro invasion assays, in vivo GBM model, and pathway Western blots\",\n      \"pmids\": [\"33608513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional control of MMP3 not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified decidual macrophages as the dominant MMP3 source and showed MMP3 degrades laminin and fibronectin to enable spiral artery remodeling in early pregnancy.\",\n      \"evidence\": \"Decidual macrophage conditioned medium, MMP array, immunohistochemistry, ex vivo chorionic plate artery model, and MMP3 inhibitor\",\n      \"pmids\": [\"35176662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct in vivo requirement during human pregnancy not testable in this model\", \"Trigger of macrophage MMP3 production not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed MMP3 restrains trabecular bone mass by promoting bone resorption, with a human promoter polymorphism tuning expression and BMD.\",\n      \"evidence\": \"Mmp3 KO mice, ovariectomy model, micro-CT, histomorphometry, promoter-luciferase reporter, and human cohort\",\n      \"pmids\": [\"35949513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular substrate driving resorption not identified\", \"Mechanism linking MMP3 to osteoclast activity not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed post-transcriptional control of MMP3 via m6A-dependent IGF2BP3 mRNA stabilization, linking MMP3 to cardiomyocyte proliferation and cardiac regeneration.\",\n      \"evidence\": \"IGF2BP3 gain/loss in mice, MeRIP m6A binding, mRNA stability assays, and cardiac injury/regeneration model\",\n      \"pmids\": [\"37188676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MMP3 substrate driving cardiomyocyte proliferation not identified\", \"m6A site on MMP3 mRNA not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined an epigenetic metastasis pathway in which KMT2C/D loss enables KDM6A-driven MMP3 upregulation to promote brain metastasis, providing a druggable axis.\",\n      \"evidence\": \"KMT2C/D KO mice, ChIP-seq for histone marks and KDM6A, KDM6A inhibition, Mmp3 siRNA, in vivo brain metastasis, and human TNBC\",\n      \"pmids\": [\"38926506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate mediating brain colonization not identified\", \"How KDM6A is recruited specifically to the Mmp3 locus not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified osteopontin as an MMP3 substrate and established MMP3 as a mediator of nanoparticle-induced lung inflammation and fibrosis.\",\n      \"evidence\": \"In vivo MMP-3 knockdown, Nano-CuO exposure, bronchoalveolar lavage, fibrosis staining, hydroxyproline, and cleaved OPN assay\",\n      \"pmids\": [\"39030581\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"OPN cleavage site not mapped\", \"Direct versus indirect contribution to fibrosis not fully separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular determinants that switch MMP3 between tumor-promoting and tumor-suppressive behavior, and the specific physiological substrates underlying most of its non-cancer roles, remain undefined.\",\n      \"evidence\": \"No single discovery in the timeline reconciles the context-dependent and substrate-level mechanisms across tissues\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Substrate repertoire largely uncharacterized beyond FasL, OPN, laminin, and fibronectin\", \"Structural basis of substrate selection not addressed\", \"Rules governing context-dependent oncogenic versus suppressive output unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 29, 30]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [5, 16, 29]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [16, 29, 5]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [29, 5, 0]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 25, 30]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 9, 4, 18, 28]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TIMP1\",\n      \"TIMP4\",\n      \"FASLG\",\n      \"SPP1\",\n      \"STAT3\",\n      \"NFATC3\",\n      \"IGF2BP3\",\n      \"KDM6A\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}