{"gene":"MMP2","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2007,"finding":"MMP-2 is phosphorylated on at least five sites (including threonine and serine residues) in mammalian cells, and phosphorylation by protein kinase C significantly modulates its enzymatic activity; dephosphorylation with alkaline phosphatase increases MMP-2 activity, establishing phosphorylation as a negative regulatory post-translational modification.","method":"Mass spectrometry (site identification), 2D immunoblot, in vitro PKC phosphorylation assay, gelatin dequenching assay, zymography, kinetic parameter measurement, alkaline phosphatase dephosphorylation","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (MS, in vitro kinase assay, enzymatic activity measurements) in a single rigorous study","pmids":["17435175"],"is_preprint":false},{"year":2018,"finding":"TIMP-2 is phosphorylated at Y90 by secreted c-Src tyrosine kinase in the extracellular space; this phosphorylation significantly enhances TIMP-2 potency as an MMP-2 inhibitor and is essential for TIMP-2 binding to latent proMMP-2, thereby controlling proMMP-2 activation.","method":"Extracellular kinase assay, site-directed mutagenesis (non-phosphorylatable Y90 mutant), co-immunoprecipitation, enzymatic inhibition assay","journal":"iScience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro phosphorylation assay combined with mutagenesis and binding assays, single lab with multiple orthogonal methods","pmids":["30227959"],"is_preprint":false},{"year":1998,"finding":"In resting platelets, MMP-2 is distributed in the cytosol without association with granules; upon collagen-stimulated aggregation, MMP-2 translocates from the cytosol to the extracellular space and associates with the platelet plasma membrane, where it mediates the ADP- and thromboxane-independent component of aggregation.","method":"Immunogold electron microscopy, flow cytometry, Western blot, zymography","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunogold EM with functional consequence (aggregation), single lab, multiple complementary methods","pmids":["9843180"],"is_preprint":false},{"year":2013,"finding":"MMP-2 is principally localized to the mitochondria-associated membrane (MAM, a subdomain of the endoplasmic reticulum) in cardiac cells rather than to mitochondria proper; MAM-localized MMP-2 can proteolyze calreticulin in vitro, suggesting a role in ER–mitochondrial Ca2+ signaling.","method":"Immunogold electron microscopy (heart sections), immunofluorescence of MMP-2:HaloTag fusion protein, subcellular fractionation (purified mitochondria vs. MAM), in vitro proteolysis assay","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution (in vitro proteolysis), structural localization by immunogold EM, subcellular fractionation, and functional colocalization studies, all in one study","pmids":["24375642"],"is_preprint":false},{"year":2012,"finding":"MMP-2 deletion in Marfan syndrome (Fbn1(mgR/mgR)) mice inhibited TGF-β activation and phosphorylation of Erk1/2 and Smad2, and prolonged lifespan, establishing that MMP-2 acts upstream of TGF-β activation and the noncanonical Erk1/2 signaling cascade in aortic dilatation.","method":"Genetic knockout (MMP-2-deficient Fbn1(mgR/mgR) mice), gelatin zymography, Western blot, life table analysis, aortic histology","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis in vivo (double-KO), multiple pathway readouts, functional (survival) and molecular (pErk1/2, pSmad2, TGF-β) outcomes","pmids":["22550139"],"is_preprint":false},{"year":2006,"finding":"Src oncogene induces MMP-2 transcription via the ERK/Sp1 pathway; the Sp1 binding site at −91/−84 of the human MMP-2 promoter is the major responsive element, and ERK inhibition (PD98059) or dominant-negative ERK-2 blocks Src-induced MMP-2 promoter activity and Sp1 DNA binding.","method":"RT-PCR, promoter-reporter assay, deletion/mutation analysis, EMSA, dominant-negative ERK-2 expression, pharmacological inhibitors","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — promoter mutagenesis, EMSA, and epistasis via dominant-negative + inhibitors, single lab with multiple orthogonal methods","pmids":["16453304"],"is_preprint":false},{"year":2002,"finding":"Cyclic mechanical stretch of lung microvascular endothelial cells increases release and activation of MMP-2 through an MT1-MMP mechanism, preceded by upregulation of EMMPRIN; MT1-MMP inhibition (via a hydroxamic acid MMP inhibitor) blocks stretch-induced MMP-2 activation.","method":"Cyclic stretch Flexercell system, gelatin zymography, reverse zymography, Western blot, RT-PCR, pharmacological inhibition","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional stretch model with mechanistic inhibitor experiments and MT1-MMP identification, single lab","pmids":["12456388"],"is_preprint":false},{"year":1997,"finding":"MT1-MMP and MMP-2 mRNAs are co-expressed and co-localized in extravillous cytotrophoblasts invading the placental bed, and both co-localize with their substrate type IV collagen, indicating that the MT1-MMP/MMP-2/collagen IV axis cooperates in trophoblast invasion.","method":"In situ hybridization, cytokeratin immunostaining on serial sections of normal and ectopic placentas","journal":"Molecular human reproduction","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct in situ co-localization across two pregnancy models, but no functional perturbation experiment","pmids":["9294857"],"is_preprint":false},{"year":2009,"finding":"MMP-2 is proteolytically activated upon ovarian cancer cell adhesion to the omentum and cleaves fibronectin, vitronectin, and collagen I into fragments that accelerate cancer cell adhesion and invasion via integrin receptors; in vivo siRNA or antibody blockade of MMP-2 before adhesion significantly reduced metastatic tumor number and weight.","method":"3D organotypic omentum culture, zymography, ECM substrate cleavage assay, siRNA knockdown, blocking antibody, xenograft mouse model","journal":"Cell cycle","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (biochemical cleavage assay, siRNA, antibody, in vivo xenograft) across in vitro and in vivo models","pmids":["19221481"],"is_preprint":false},{"year":1999,"finding":"In the ovarian tumor microenvironment, carcinoma cell–fibroblast contact stimulates proMMP-2 release from fibroblasts; collagen I (but not other ECM components) and β1 integrin antibody trigger activation of proMMP-2 by a membrane-bound metalloproteinase on tumor-derived fibroblasts, generating active MMP-2 that associates with tumor cell surfaces.","method":"Co-culture experiments, conditioned medium analysis, zymography, collagen gel stimulation, antibody perturbation (anti-β1 integrin)","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based reconstitution with multiple perturbants, single lab","pmids":["10408832"],"is_preprint":false},{"year":2005,"finding":"Selective MMP-2 gene knockout in TNF-α transgenic cardiomyopathy mice reduced survival and exacerbated cardiac dysfunction with increased myocardial macrophage infiltration and proinflammatory cytokines, demonstrating a cardioprotective role for MMP-2 in cytokine-induced cardiomyopathy.","method":"MMP-2 knockout crossed with TNF-α transgenic mice, survival analysis, echocardiography, zymography, immunohistochemistry, cytokine measurement","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis (double-mutant), multiple functional and molecular readouts, in vivo model","pmids":["15937097"],"is_preprint":false},{"year":2007,"finding":"Cardiac-specific transgenic overexpression of active MMP-2 abolishes ischemic preconditioning cardioprotection and causes mitochondrial ultrastructural abnormalities and impaired respiration, establishing MMP-2 as a negative regulator of mitochondrial function under oxidative stress.","method":"Cardiac-specific transgenic mouse (MMP-2 Tg), ex vivo ischemia–reperfusion model, electron microscopy (mitochondrial ultrastructure), mitochondrial respiration assay, infarct size measurement","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic gain-of-function with functional readouts (preconditioning abolition, mitochondrial respiration), single lab","pmids":["17475219"],"is_preprint":false},{"year":2011,"finding":"HMGA1 directly binds the MMP-2 promoter in vivo in large-cell lung cancer cells (chromatin immunoprecipitation), upregulates MMP-2 mRNA and protein expression, and MMP-2 knockdown blocks HMGA1-induced anchorage-independent growth and invasion.","method":"ChIP, RT-PCR, siRNA knockdown, anchorage-independent growth assay, invasion assay","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishing direct promoter binding plus functional siRNA rescue, single lab","pmids":["19903768"],"is_preprint":false},{"year":2012,"finding":"MMP-14 (MT1-MMP) knockdown inhibits proMMP-2 activation in Dupuytren's disease fibroblasts, and knockdown of MMP-2 (but not MMP-1, -3, or -13) inhibits fibroblast-mediated collagen contraction, establishing MMP-14 as the key activator of proMMP-2 and MMP-2 as essential for cell-mediated contraction in this fibrotic condition.","method":"siRNA knockdown, fibroblast-populated collagen lattice (FPCL) contraction assay, zymography, gene expression profiling","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis with functional contraction readout, single lab with two complementary knockdown experiments","pmids":["22342364"],"is_preprint":false},{"year":2008,"finding":"In human intervertebral disc degeneration, active MMP-2 levels correlate significantly with MMP-14 expression (but less strongly with TIMP-2), indicating that MMP-14 activates proMMP-2 during disc degeneration via the MT1-MMP/TIMP-2 activation complex.","method":"Gelatin zymography (MMP-2 quantification), immunohistochemistry (MMP-14, TIMP-2), correlation analysis across 56 graded human IVDs","journal":"The Journal of pathology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlation study without direct perturbation; consistent with known mechanism but not experimentally validated here","pmids":["18200629"],"is_preprint":false},{"year":2002,"finding":"Adenosine A1 receptor agonist (CHA) stimulates MMP-2 secretion from trabecular meshwork cells via ERK1/2 activation; this response is blocked by an A1 receptor antagonist (CPT) and the ERK pathway inhibitor U0126, placing ERK1/2 downstream of A1 receptor activation and upstream of MMP-2 secretion.","method":"Cell culture, CHA/CPT/U0126 pharmacological experiments, ELISA (MMP-2 secretion), Western blot (ERK phosphorylation), dose-response analysis","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor agonist/antagonist epistasis plus pathway inhibitor, single lab","pmids":["12202524"],"is_preprint":false},{"year":2009,"finding":"Ets-2 and phospho-p53 mediate PKA (cAMP/Forskolin)-induced MMP-2 expression and trophoblast invasiveness; antisense inhibition of Ets-2 and p53 reduces MMP-2 mRNA, secretion, and transwell invasion.","method":"Northern blot, RT-PCR, EMSA, Western blot, antisense transfection, zymography, transwell invasion assay","journal":"Reproductive biology and endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA-confirmed binding plus antisense knockdown with functional invasion readout, single lab","pmids":["19939245"],"is_preprint":false},{"year":2015,"finding":"Intracellular MMP-2 is concentrated at sarcomere Z-lines, the nuclear membrane, and mitochondria of skeletal muscle fibers, with gelatinolytic activity predominantly in fast-twitch type II fibers; activity is reduced by metalloprotease inhibitors (EDTA, CTT2) but not a cysteine protease inhibitor, and decreases with high-intensity interval training.","method":"Immunohistochemistry, immunogold electron microscopy, in situ zymography, pharmacological inhibitors","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunogold EM plus functional in situ zymography with inhibitor validation, single lab","pmids":["24905939"],"is_preprint":false},{"year":2010,"finding":"MMP-2 inhibition in medulloblastoma tumor cells reduces SDF-1 in tumor-conditioned medium, impairs SDF-1/CXCR4 signaling, and decreases tropism of human umbilical cord blood-derived stem cells toward tumors both in vitro and in vivo.","method":"Adenoviral siRNA (Ad-MMP-2 si), transwell migration assay, Western blot, immunohistochemistry, in vivo tumor model","journal":"Gene therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with mechanistic SDF-1/CXCR4 pathway readout plus in vivo validation, single lab","pmids":["21368903"],"is_preprint":false},{"year":2022,"finding":"MMP-2 knockdown in aging mice attenuates age-dependent carotid stiffness by decreasing elastin degradation (lower plasma desmosine) and increasing eNOS phosphorylation and vascular cGMP; an age-dependent direct protein–protein interaction between MMP-2 and eNOS was observed, suggesting MMP-2 inhibits eNOS bioavailability.","method":"siRNA knockdown (tail-vein injection), pulse wave velocity, Western blot, co-immunoprecipitation (MMP-2/eNOS interaction), plasma desmosine ELISA, cGMP measurement, human cohort correlation","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo siRNA with multiple molecular and functional readouts, co-IP for protein interaction, single lab","pmids":["34586381"],"is_preprint":false},{"year":2010,"finding":"MMP-2 is expressed and secreted by sympathetic neurons and, together with MT1-MMP, converts pro-NGF to mature NGF; pharmacological MMP-2 inhibition increases pro-NGF accumulation and reduces HFES-induced neurite outgrowth, establishing MMP-2 as a pro-NGF convertase controlling sympathetic nerve sprouting.","method":"Cell culture of superior cervical ganglia neurons, high-frequency electrical field stimulation, RT-PCR, Western blot, zymography, pharmacological MMP-2 inhibition, neurite outgrowth measurement","journal":"Cellular and molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis with substrate (pro-NGF) and functional (neurite outgrowth) readouts, single lab","pmids":["20683769"],"is_preprint":false},{"year":2011,"finding":"WISP-1 increases MMP-2 expression and chondrosarcoma cell migration via α5β1 integrin → FAK → MEK/ERK → NF-κB/p65 pathway; blocking α5β1, MEK (PD98059/U0126), or NF-κB inhibits WISP-1-induced MMP-2 upregulation and migration.","method":"Pharmacological inhibitors, blocking antibody (α5β1), phosphorylation Western blot, NF-κB luciferase reporter, ChIP (p65 on MMP-2 promoter), migration assay","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP on MMP-2 promoter plus multi-step pharmacological epistasis with functional readout, single lab","pmids":["21453685"],"is_preprint":false},{"year":2003,"finding":"Zebrafish MMP-2 (>80% identity to human MMP-2) is expressed from the one-cell stage (maternal origin); morpholino antisense knockdown causes a truncated embryonic axis beginning at 12 h, demonstrating an essential role for MMP-2 in early vertebrate embryogenesis—in contrast to mouse knockout studies.","method":"In situ hybridization, RT-PCR, gelatin zymography, antisense morpholino oligonucleotide injection, developmental axis marker analysis","journal":"Development genes and evolution","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino loss-of-function with morphological and marker-based phenotypic readout, single lab","pmids":["12898250"],"is_preprint":false},{"year":2014,"finding":"MMP-2 deficiency in Purkinje cells of MMP-2−/− mice leads to reduced soma growth, smaller dendritic trees, decreased arborization, and increased spine density with reduced spine length; proteomics identified elevated phospho-CRMP1 in MMP-2−/− cerebella as a potential mediator of aberrant dendritogenesis.","method":"2D-DIGE proteomics, Western blot, immunohistochemistry, morphometric analysis, MMP-2 knockout mice","journal":"Brain structure & function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with quantitative morphometric phenotyping and proteomics, single lab","pmids":["24652381"],"is_preprint":false},{"year":2003,"finding":"Estrogen (E2) at 10−10 M increases MMP-2 activity (~2.2-fold) and protein expression (~2.5-fold) in retinal pigment epithelium cells; this effect is abolished by the NF-κB inhibitor PDTC, placing NF-κB downstream of estrogen receptor activation and upstream of MMP-2 regulation.","method":"Zymography, Western blot, PDTC inhibition, estrogen receptor transfection reporter assay","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological NF-κB inhibition with dual protein/activity readout, single lab","pmids":["12506055"],"is_preprint":false},{"year":2011,"finding":"In rheumatoid arthritis synovial fibroblasts, recombinant MMP-2 inactivates NF-κB and suppresses cartilage degradation, whereas endogenous MMP-2 suppression (siRNA) activates NF-κB and increases TNF-α and IL-17 secretion, revealing an anti-inflammatory function of MMP-2 distinct from the pro-inflammatory role of MMP-9.","method":"siRNA knockdown, recombinant protein treatment, specific inhibitors, NF-κB activation Western blot, ELISA for cytokines, cartilage degradation assay (1,9-DMMB), invasion and migration assays","journal":"Rheumatology (Oxford)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA + recombinant protein rescue + specific inhibitors, multiple functional readouts, single lab","pmids":["24982240"],"is_preprint":false},{"year":2022,"finding":"HIF-2α (not HIF-1α) mediates hypoxia-induced MMP-2 upregulation in scleral fibroblasts; HIF-2A siRNA silencing abolishes hypoxia-induced MMP-2 expression and FD-induced collagen degradation and myopia development in mice, whereas HIF-1α knockdown does not affect MMP-2 upregulation.","method":"HIF-2A siRNA in human scleral fibroblasts (1% O2), AAV8-Cre scleral injection in HIF-2αfl/fl and HIF-1αfl/fl mice, Western blot, qRT-PCR, pulse refraction measurement","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional in vivo knockout epistasis plus in vitro siRNA, single lab","pmids":["35802383"],"is_preprint":false},{"year":2016,"finding":"In iPSC-derived cortical neurons with MAPT mutations, elevated MMP-2 (and MMP-9) levels contribute to stress-induced neuronal death; MMP-2/9 inhibitors protect patient neurons, and recombinant MMP-2 decreases neuronal survival, demonstrating a direct cytotoxic function of secreted MMP-2 toward neurons.","method":"iPSC-derived cortical neurons, MMP inhibitor treatment, recombinant MMP-2/9 treatment, ERK pathway inhibitor, cell viability assay","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — recombinant protein gain-of-function and inhibitor rescue in human iPSC model, single lab","pmids":["27594586"],"is_preprint":false},{"year":2015,"finding":"MMP-2 promotes murine adipogenesis: MMP-2-deficient MEFs show 90% reduced lipid accumulation and reduced pro-adipogenic marker expression; MMP-2 shRNA knockdown in 3T3-F442A preadipocytes impairs differentiation while MMP-2 overexpression markedly enhances it.","method":"Mmp2 KO MEF differentiation, shRNA knockdown, Mmp2 overexpression, oil-red-O staining, marker gene expression, in vivo fat pad model","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO plus gain- and loss-of-function in cell lines with in vivo follow-up, single lab","pmids":["25869489"],"is_preprint":false},{"year":2011,"finding":"MMP-2 siRNA knockdown in glioma cells blocks radiation-enhanced invasion by inhibiting VEGF, VEGFR-2, pVEGFR-2, p-FAK, and p-p38 signaling and induces apoptosis; in vivo MMP-2 siRNA significantly reduces intracranial tumor growth.","method":"Plasmid-mediated siRNA, Western blot, invasion/migration assays, TUNEL staining, intracranial xenograft model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with multiple downstream signaling and functional readouts plus in vivo validation, single lab","pmids":["21698233"],"is_preprint":false},{"year":2014,"finding":"S100A8/A9 expression selectively down-regulates MMP-2 expression and activity in carcinoma cells; conversely, silencing S100A8/A9 increases MMP-2 activity and invasion; MMP-2 silencing reduces the malignant phenotype, and 3D collagen growth increases MMP-2 expression relative to 2D.","method":"Transfection of S100A8/A9 expression constructs, siRNA knockdown of S100A8/A9 and MMP-2, zymography, invasion/migration assays, 3D collagen substrate","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss of function with mechanistic activity readouts, single lab","pmids":["25236491"],"is_preprint":false},{"year":2012,"finding":"In fibroblasts, myofibroblast contractility (driven by F-actin assembly, serum, or TGF-β) suppresses MMP-2 expression inversely to smooth muscle α-actin expression; MRTF-A/B knockdown (myocardin-like factors that drive contractile gene expression) relieves serum/TGF-β-induced MMP-2 suppression, linking the actin–MRTF–contractile gene axis to MMP-2 regulation.","method":"3D collagen lattice under tension vs. stress release, 2D culture with pharmacological F-actin modulators, RNAi knockdown of MRTF-A/B, Western blot","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis combined with pharmacological and mechanical perturbations, single lab","pmids":["22449415"],"is_preprint":false},{"year":2012,"finding":"BMP2 induces MMP-2 secretion and activation in pancreatic PANC-1 cells via ROS accumulation and ERK phosphorylation; ROS scavenger 2-MPG or ERK inhibitor PD98059 reduces BMP2-induced MMP-2 activation and cell invasion.","method":"BMP2 stimulation, ROS scavenger and ERK inhibitor treatment, zymography, Western blot, invasion assay","journal":"Frontiers in bioscience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological pathway inhibition without genetic epistasis, single lab, single set of methods","pmids":["22652796"],"is_preprint":false},{"year":2003,"finding":"MMP-2 is expressed as an active form on the membrane of human cervical cancer cells in a complex involving αvβ3 integrin and MT1-MMP, consistent with the αvβ3/MT1-MMP/TIMP-2 trimolecular activation complex mediating MMP-2 activation at the tumor cell surface.","method":"Subcellular membrane fractionation, Western blot, immunoprecipitation (MMP-2 with αvβ3 integrin), MT1-MMP expression analysis","journal":"Journal of environmental pathology, toxicology and oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP without functional perturbation experiments, single lab","pmids":["14533872"],"is_preprint":false}],"current_model":"MMP-2 (gelatinase A) is a zinc-dependent endopeptidase secreted as a latent proenzyme (proMMP-2) that is activated extracellularly via a trimolecular MT1-MMP/TIMP-2/proMMP-2 cell-surface complex requiring collagen I or β1 integrin signals; its activity is further regulated by multi-site phosphorylation (negatively, by PKC) and by extracellular c-Src–mediated phosphorylation of TIMP-2 (positively, enhancing inhibition and controlling proMMP-2 activation); beyond ECM remodeling, MMP-2 also localizes intracellularly to the mitochondria-associated membrane (where it can cleave calreticulin), to sarcomere Z-lines and mitochondria of skeletal muscle, and to the platelet cytosol (translocating to the membrane upon collagen-stimulated aggregation); transcription is driven by ERK/Sp1 downstream of Src, by PKA/Ets-2/p53 in trophoblasts, and by HIF-2α under hypoxia, while contractile MRTF-A/B signaling suppresses it; genetically, MMP-2 acts upstream of TGF-β activation and noncanonical Erk1/2/Smad2 signaling in Marfan aortopathy, exerts a cardioprotective anti-inflammatory role in cytokine-driven cardiomyopathy, promotes adipogenesis and neural dendritogenesis, and converts pro-NGF to NGF in sympathetic neurons to control nerve sprouting."},"narrative":{"mechanistic_narrative":"MMP-2 (gelatinase A) is a zinc-dependent endopeptidase that remodels the extracellular matrix and, through proteolysis of structural and signaling proteins, governs cell invasion, fibrosis, vascular and cardiac homeostasis, and neuronal and adipocyte differentiation [PMID:19221481, PMID:25869489]. It is secreted as a latent proenzyme whose activation occurs at the cell surface through a membrane-bound MT1-MMP (MMP-14) mechanism that requires collagen I or β1-integrin cues, generating active enzyme that associates with the tumor or fibroblast surface [PMID:10408832, PMID:22342364, PMID:12456388]; this activation is controlled by TIMP-2, whose binding to proMMP-2 and inhibitory potency depend on extracellular c-Src phosphorylation at Y90 [PMID:30227959], while multi-site phosphorylation of MMP-2 itself, including by PKC, negatively regulates its catalytic activity [PMID:17435175]. Once active, MMP-2 cleaves ECM substrates such as fibronectin, vitronectin, and collagen I into fragments that drive integrin-dependent adhesion and metastasis [PMID:19221481], and it processes non-ECM substrates including pro-NGF to mature NGF to control sympathetic nerve sprouting [PMID:20683769]. MMP-2 transcription is induced by Src via the ERK/Sp1 axis [PMID:16453304], by PKA through Ets-2 and phospho-p53 in trophoblasts [PMID:19939245], and by HIF-2α under hypoxia [PMID:35802383], and is suppressed by the actin–MRTF-A/B contractile gene program [PMID:22449415]. Beyond its canonical extracellular role, MMP-2 localizes intracellularly to the mitochondria-associated membrane where it cleaves calreticulin [PMID:24375642], to sarcomere Z-lines, nuclear membrane, and mitochondria of skeletal muscle [PMID:24905939], and to the platelet cytosol from which it translocates to the membrane upon collagen-stimulated aggregation [PMID:9843180]. Genetically, MMP-2 acts upstream of TGF-β activation and noncanonical Erk1/2/Smad2 signaling in Marfan aortopathy [PMID:22550139], exerts a cardioprotective, anti-inflammatory role in cytokine-driven cardiomyopathy [PMID:15937097], and promotes adipogenesis [PMID:25869489] and Purkinje-cell dendritogenesis [PMID:24652381].","teleology":[{"year":1997,"claim":"Established that MMP-2 and MT1-MMP are co-expressed at sites of tissue invasion alongside their collagen IV substrate, framing the membrane activation axis in a physiological invasion context.","evidence":"In situ hybridization and immunostaining of extravillous cytotrophoblasts in placental bed","pmids":["9294857"],"confidence":"Medium","gaps":["Co-localization only, no functional perturbation","Did not demonstrate direct activation event"]},{"year":1998,"claim":"Showed MMP-2 has an intracellular pool that mobilizes upon stimulation, the first hint that its biology extends beyond constitutive secretion.","evidence":"Immunogold EM and flow cytometry of resting and collagen-aggregated platelets","pmids":["9843180"],"confidence":"Medium","gaps":["Mechanism of cytosol-to-membrane translocation unknown","How cytosolic MMP-2 escapes the secretory pathway unresolved"]},{"year":1999,"claim":"Identified collagen I and β1 integrin as the specific signals triggering membrane-bound proMMP-2 activation on fibroblasts, defining the activation triggers.","evidence":"Carcinoma–fibroblast co-culture with collagen gel stimulation and anti-β1 integrin perturbation, zymography","pmids":["10408832"],"confidence":"Medium","gaps":["Membrane metalloproteinase identity inferred, not directly proven here","Single lab cell-based reconstitution"]},{"year":2002,"claim":"Connected mechanical stretch to MMP-2 activation via MT1-MMP and EMMPRIN, linking biophysical cues to the activation machinery.","evidence":"Cyclic stretch of lung endothelial cells with MMP inhibitor, zymography and RT-PCR","pmids":["12456388"],"confidence":"Medium","gaps":["MT1-MMP role inferred from pharmacological inhibition","EMMPRIN mechanistic link correlative"]},{"year":2006,"claim":"Mapped the transcriptional route from Src oncogene through ERK to the Sp1 site on the MMP-2 promoter, defining an inducible expression pathway.","evidence":"Promoter-reporter mutagenesis, EMSA, dominant-negative ERK-2 in cells","pmids":["16453304"],"confidence":"High","gaps":["Did not address activation/secretion regulation","Single-cell-type promoter analysis"]},{"year":2007,"claim":"Revealed phosphorylation as a direct post-translational brake on MMP-2 catalysis, adding a layer of regulation beyond proenzyme activation.","evidence":"MS site mapping, in vitro PKC phosphorylation, alkaline phosphatase dephosphorylation, activity assays","pmids":["17435175"],"confidence":"High","gaps":["In vivo kinase(s) for each site not identified","Phosphatase counter-regulators unknown"]},{"year":2009,"claim":"Demonstrated that active MMP-2 cleaves ECM proteins into pro-invasive fragments and is required in vivo for metastatic colonization, anchoring its catalytic role to disease outcome.","evidence":"3D omentum culture, ECM cleavage assays, siRNA, blocking antibody, xenograft","pmids":["19221481"],"confidence":"High","gaps":["Integrin receptors for cleaved fragments not individually defined","Relative contribution of each ECM substrate unresolved"]},{"year":2012,"claim":"Placed MMP-2 genetically upstream of TGF-β activation and noncanonical Erk1/2/Smad2 signaling in aortic disease, establishing a causal disease mechanism.","evidence":"MMP-2 KO crossed into Fbn1(mgR/mgR) Marfan mice, survival, zymography, pathway Western blots","pmids":["22550139"],"confidence":"High","gaps":["Direct TGF-β latency substrate of MMP-2 not identified","Cell type responsible not pinpointed"]},{"year":2013,"claim":"Defined a precise intracellular niche for MMP-2 at the mitochondria-associated membrane with calreticulin as a candidate substrate, expanding its role into ER–mitochondrial Ca2+ biology.","evidence":"Immunogold EM, MMP-2:HaloTag imaging, subcellular fractionation, in vitro proteolysis of calreticulin","pmids":["24375642"],"confidence":"High","gaps":["In vivo significance of calreticulin cleavage untested","How MMP-2 reaches the MAM cytoplasmic face unresolved"]},{"year":2018,"claim":"Showed extracellular c-Src phosphorylates TIMP-2 at Y90 to control its binding to proMMP-2 and inhibitory potency, identifying a phosphorylation switch on the inhibitor side of the activation complex.","evidence":"Extracellular kinase assay, Y90 non-phosphorylatable mutant, co-IP, inhibition assays","pmids":["30227959"],"confidence":"High","gaps":["In vivo relevance of extracellular Src phosphorylation untested","Phosphatase reversing Y90 unknown"]},{"year":2022,"claim":"Identified HIF-2α (not HIF-1α) as the hypoxia-responsive transcriptional driver of MMP-2 in scleral fibroblasts and an MMP-2/eNOS interaction in vascular aging, diversifying its regulatory and substrate repertoire.","evidence":"HIF-2A siRNA and conditional knockout mice; MMP-2 siRNA, co-IP with eNOS, desmosine and cGMP measurement","pmids":["35802383","34586381"],"confidence":"Medium","gaps":["MMP-2/eNOS interaction surface and functional consequence not structurally defined","Whether eNOS is a cleavage substrate or binding partner only unresolved"]},{"year":null,"claim":"How MMP-2 partitions between extracellular and intracellular (MAM, sarcomere, platelet cytosol) pools, and how its non-ECM substrate set is selected in each compartment, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for intracellular targeting versus secretion","Compartment-specific substrate repertoire largely uncharacterized","Physiological in vivo substrates of intracellular MMP-2 not validated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[8,20,3]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,8,17]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[17,2]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[8,9,20]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,17,11]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,33]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix 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knockdown blunts age-dependent carotid stiffness by decreasing elastin degradation and augmenting eNOS activation.","date":"2022","source":"Cardiovascular research","url":"https://pubmed.ncbi.nlm.nih.gov/34586381","citation_count":26,"is_preprint":false},{"pmid":"27783864","id":"PMC_27783864","title":"Modulation of Systemic Metabolism by MMP-2: From MMP-2 Deficiency in Mice to MMP-2 Deficiency in Patients.","date":"2016","source":"Comprehensive Physiology","url":"https://pubmed.ncbi.nlm.nih.gov/27783864","citation_count":26,"is_preprint":false},{"pmid":"9625836","id":"PMC_9625836","title":"Different expression patterns of MMP-2 and MMP-9 in breast cancer.","date":"1998","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/9625836","citation_count":26,"is_preprint":false},{"pmid":"22095325","id":"PMC_22095325","title":"MMP(-2) expression in skeletal muscle after strength training.","date":"2011","source":"International journal of sports medicine","url":"https://pubmed.ncbi.nlm.nih.gov/22095325","citation_count":26,"is_preprint":false},{"pmid":"36142480","id":"PMC_36142480","title":"Association of MMP-2 and MMP-9 Polymorphisms with Diabetes and Pathogenesis of Diabetic Complications.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36142480","citation_count":25,"is_preprint":false},{"pmid":"27406386","id":"PMC_27406386","title":"Expression of metalloproteinases (MMP-2 and MMP-9) in basal-cell carcinoma.","date":"2016","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/27406386","citation_count":25,"is_preprint":false},{"pmid":"15120641","id":"PMC_15120641","title":"Fibronectin-induced COX-2 mediates MMP-2 expression and invasiveness of rhabdomyosarcoma.","date":"2004","source":"Biochemical and biophysical research 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in mammalian cells, and phosphorylation by protein kinase C significantly modulates its enzymatic activity; dephosphorylation with alkaline phosphatase increases MMP-2 activity, establishing phosphorylation as a negative regulatory post-translational modification.\",\n      \"method\": \"Mass spectrometry (site identification), 2D immunoblot, in vitro PKC phosphorylation assay, gelatin dequenching assay, zymography, kinetic parameter measurement, alkaline phosphatase dephosphorylation\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (MS, in vitro kinase assay, enzymatic activity measurements) in a single rigorous study\",\n      \"pmids\": [\"17435175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TIMP-2 is phosphorylated at Y90 by secreted c-Src tyrosine kinase in the extracellular space; this phosphorylation significantly enhances TIMP-2 potency as an MMP-2 inhibitor and is essential for TIMP-2 binding to latent proMMP-2, thereby controlling proMMP-2 activation.\",\n      \"method\": \"Extracellular kinase assay, site-directed mutagenesis (non-phosphorylatable Y90 mutant), co-immunoprecipitation, enzymatic inhibition assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphorylation assay combined with mutagenesis and binding assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"30227959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In resting platelets, MMP-2 is distributed in the cytosol without association with granules; upon collagen-stimulated aggregation, MMP-2 translocates from the cytosol to the extracellular space and associates with the platelet plasma membrane, where it mediates the ADP- and thromboxane-independent component of aggregation.\",\n      \"method\": \"Immunogold electron microscopy, flow cytometry, Western blot, zymography\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunogold EM with functional consequence (aggregation), single lab, multiple complementary methods\",\n      \"pmids\": [\"9843180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MMP-2 is principally localized to the mitochondria-associated membrane (MAM, a subdomain of the endoplasmic reticulum) in cardiac cells rather than to mitochondria proper; MAM-localized MMP-2 can proteolyze calreticulin in vitro, suggesting a role in ER–mitochondrial Ca2+ signaling.\",\n      \"method\": \"Immunogold electron microscopy (heart sections), immunofluorescence of MMP-2:HaloTag fusion protein, subcellular fractionation (purified mitochondria vs. MAM), in vitro proteolysis assay\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution (in vitro proteolysis), structural localization by immunogold EM, subcellular fractionation, and functional colocalization studies, all in one study\",\n      \"pmids\": [\"24375642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MMP-2 deletion in Marfan syndrome (Fbn1(mgR/mgR)) mice inhibited TGF-β activation and phosphorylation of Erk1/2 and Smad2, and prolonged lifespan, establishing that MMP-2 acts upstream of TGF-β activation and the noncanonical Erk1/2 signaling cascade in aortic dilatation.\",\n      \"method\": \"Genetic knockout (MMP-2-deficient Fbn1(mgR/mgR) mice), gelatin zymography, Western blot, life table analysis, aortic histology\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis in vivo (double-KO), multiple pathway readouts, functional (survival) and molecular (pErk1/2, pSmad2, TGF-β) outcomes\",\n      \"pmids\": [\"22550139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Src oncogene induces MMP-2 transcription via the ERK/Sp1 pathway; the Sp1 binding site at −91/−84 of the human MMP-2 promoter is the major responsive element, and ERK inhibition (PD98059) or dominant-negative ERK-2 blocks Src-induced MMP-2 promoter activity and Sp1 DNA binding.\",\n      \"method\": \"RT-PCR, promoter-reporter assay, deletion/mutation analysis, EMSA, dominant-negative ERK-2 expression, pharmacological inhibitors\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter mutagenesis, EMSA, and epistasis via dominant-negative + inhibitors, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16453304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cyclic mechanical stretch of lung microvascular endothelial cells increases release and activation of MMP-2 through an MT1-MMP mechanism, preceded by upregulation of EMMPRIN; MT1-MMP inhibition (via a hydroxamic acid MMP inhibitor) blocks stretch-induced MMP-2 activation.\",\n      \"method\": \"Cyclic stretch Flexercell system, gelatin zymography, reverse zymography, Western blot, RT-PCR, pharmacological inhibition\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional stretch model with mechanistic inhibitor experiments and MT1-MMP identification, single lab\",\n      \"pmids\": [\"12456388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MT1-MMP and MMP-2 mRNAs are co-expressed and co-localized in extravillous cytotrophoblasts invading the placental bed, and both co-localize with their substrate type IV collagen, indicating that the MT1-MMP/MMP-2/collagen IV axis cooperates in trophoblast invasion.\",\n      \"method\": \"In situ hybridization, cytokeratin immunostaining on serial sections of normal and ectopic placentas\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct in situ co-localization across two pregnancy models, but no functional perturbation experiment\",\n      \"pmids\": [\"9294857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MMP-2 is proteolytically activated upon ovarian cancer cell adhesion to the omentum and cleaves fibronectin, vitronectin, and collagen I into fragments that accelerate cancer cell adhesion and invasion via integrin receptors; in vivo siRNA or antibody blockade of MMP-2 before adhesion significantly reduced metastatic tumor number and weight.\",\n      \"method\": \"3D organotypic omentum culture, zymography, ECM substrate cleavage assay, siRNA knockdown, blocking antibody, xenograft mouse model\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (biochemical cleavage assay, siRNA, antibody, in vivo xenograft) across in vitro and in vivo models\",\n      \"pmids\": [\"19221481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In the ovarian tumor microenvironment, carcinoma cell–fibroblast contact stimulates proMMP-2 release from fibroblasts; collagen I (but not other ECM components) and β1 integrin antibody trigger activation of proMMP-2 by a membrane-bound metalloproteinase on tumor-derived fibroblasts, generating active MMP-2 that associates with tumor cell surfaces.\",\n      \"method\": \"Co-culture experiments, conditioned medium analysis, zymography, collagen gel stimulation, antibody perturbation (anti-β1 integrin)\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based reconstitution with multiple perturbants, single lab\",\n      \"pmids\": [\"10408832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Selective MMP-2 gene knockout in TNF-α transgenic cardiomyopathy mice reduced survival and exacerbated cardiac dysfunction with increased myocardial macrophage infiltration and proinflammatory cytokines, demonstrating a cardioprotective role for MMP-2 in cytokine-induced cardiomyopathy.\",\n      \"method\": \"MMP-2 knockout crossed with TNF-α transgenic mice, survival analysis, echocardiography, zymography, immunohistochemistry, cytokine measurement\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis (double-mutant), multiple functional and molecular readouts, in vivo model\",\n      \"pmids\": [\"15937097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cardiac-specific transgenic overexpression of active MMP-2 abolishes ischemic preconditioning cardioprotection and causes mitochondrial ultrastructural abnormalities and impaired respiration, establishing MMP-2 as a negative regulator of mitochondrial function under oxidative stress.\",\n      \"method\": \"Cardiac-specific transgenic mouse (MMP-2 Tg), ex vivo ischemia–reperfusion model, electron microscopy (mitochondrial ultrastructure), mitochondrial respiration assay, infarct size measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic gain-of-function with functional readouts (preconditioning abolition, mitochondrial respiration), single lab\",\n      \"pmids\": [\"17475219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HMGA1 directly binds the MMP-2 promoter in vivo in large-cell lung cancer cells (chromatin immunoprecipitation), upregulates MMP-2 mRNA and protein expression, and MMP-2 knockdown blocks HMGA1-induced anchorage-independent growth and invasion.\",\n      \"method\": \"ChIP, RT-PCR, siRNA knockdown, anchorage-independent growth assay, invasion assay\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishing direct promoter binding plus functional siRNA rescue, single lab\",\n      \"pmids\": [\"19903768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MMP-14 (MT1-MMP) knockdown inhibits proMMP-2 activation in Dupuytren's disease fibroblasts, and knockdown of MMP-2 (but not MMP-1, -3, or -13) inhibits fibroblast-mediated collagen contraction, establishing MMP-14 as the key activator of proMMP-2 and MMP-2 as essential for cell-mediated contraction in this fibrotic condition.\",\n      \"method\": \"siRNA knockdown, fibroblast-populated collagen lattice (FPCL) contraction assay, zymography, gene expression profiling\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis with functional contraction readout, single lab with two complementary knockdown experiments\",\n      \"pmids\": [\"22342364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In human intervertebral disc degeneration, active MMP-2 levels correlate significantly with MMP-14 expression (but less strongly with TIMP-2), indicating that MMP-14 activates proMMP-2 during disc degeneration via the MT1-MMP/TIMP-2 activation complex.\",\n      \"method\": \"Gelatin zymography (MMP-2 quantification), immunohistochemistry (MMP-14, TIMP-2), correlation analysis across 56 graded human IVDs\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlation study without direct perturbation; consistent with known mechanism but not experimentally validated here\",\n      \"pmids\": [\"18200629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Adenosine A1 receptor agonist (CHA) stimulates MMP-2 secretion from trabecular meshwork cells via ERK1/2 activation; this response is blocked by an A1 receptor antagonist (CPT) and the ERK pathway inhibitor U0126, placing ERK1/2 downstream of A1 receptor activation and upstream of MMP-2 secretion.\",\n      \"method\": \"Cell culture, CHA/CPT/U0126 pharmacological experiments, ELISA (MMP-2 secretion), Western blot (ERK phosphorylation), dose-response analysis\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor agonist/antagonist epistasis plus pathway inhibitor, single lab\",\n      \"pmids\": [\"12202524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Ets-2 and phospho-p53 mediate PKA (cAMP/Forskolin)-induced MMP-2 expression and trophoblast invasiveness; antisense inhibition of Ets-2 and p53 reduces MMP-2 mRNA, secretion, and transwell invasion.\",\n      \"method\": \"Northern blot, RT-PCR, EMSA, Western blot, antisense transfection, zymography, transwell invasion assay\",\n      \"journal\": \"Reproductive biology and endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA-confirmed binding plus antisense knockdown with functional invasion readout, single lab\",\n      \"pmids\": [\"19939245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Intracellular MMP-2 is concentrated at sarcomere Z-lines, the nuclear membrane, and mitochondria of skeletal muscle fibers, with gelatinolytic activity predominantly in fast-twitch type II fibers; activity is reduced by metalloprotease inhibitors (EDTA, CTT2) but not a cysteine protease inhibitor, and decreases with high-intensity interval training.\",\n      \"method\": \"Immunohistochemistry, immunogold electron microscopy, in situ zymography, pharmacological inhibitors\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunogold EM plus functional in situ zymography with inhibitor validation, single lab\",\n      \"pmids\": [\"24905939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MMP-2 inhibition in medulloblastoma tumor cells reduces SDF-1 in tumor-conditioned medium, impairs SDF-1/CXCR4 signaling, and decreases tropism of human umbilical cord blood-derived stem cells toward tumors both in vitro and in vivo.\",\n      \"method\": \"Adenoviral siRNA (Ad-MMP-2 si), transwell migration assay, Western blot, immunohistochemistry, in vivo tumor model\",\n      \"journal\": \"Gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with mechanistic SDF-1/CXCR4 pathway readout plus in vivo validation, single lab\",\n      \"pmids\": [\"21368903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MMP-2 knockdown in aging mice attenuates age-dependent carotid stiffness by decreasing elastin degradation (lower plasma desmosine) and increasing eNOS phosphorylation and vascular cGMP; an age-dependent direct protein–protein interaction between MMP-2 and eNOS was observed, suggesting MMP-2 inhibits eNOS bioavailability.\",\n      \"method\": \"siRNA knockdown (tail-vein injection), pulse wave velocity, Western blot, co-immunoprecipitation (MMP-2/eNOS interaction), plasma desmosine ELISA, cGMP measurement, human cohort correlation\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo siRNA with multiple molecular and functional readouts, co-IP for protein interaction, single lab\",\n      \"pmids\": [\"34586381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MMP-2 is expressed and secreted by sympathetic neurons and, together with MT1-MMP, converts pro-NGF to mature NGF; pharmacological MMP-2 inhibition increases pro-NGF accumulation and reduces HFES-induced neurite outgrowth, establishing MMP-2 as a pro-NGF convertase controlling sympathetic nerve sprouting.\",\n      \"method\": \"Cell culture of superior cervical ganglia neurons, high-frequency electrical field stimulation, RT-PCR, Western blot, zymography, pharmacological MMP-2 inhibition, neurite outgrowth measurement\",\n      \"journal\": \"Cellular and molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis with substrate (pro-NGF) and functional (neurite outgrowth) readouts, single lab\",\n      \"pmids\": [\"20683769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"WISP-1 increases MMP-2 expression and chondrosarcoma cell migration via α5β1 integrin → FAK → MEK/ERK → NF-κB/p65 pathway; blocking α5β1, MEK (PD98059/U0126), or NF-κB inhibits WISP-1-induced MMP-2 upregulation and migration.\",\n      \"method\": \"Pharmacological inhibitors, blocking antibody (α5β1), phosphorylation Western blot, NF-κB luciferase reporter, ChIP (p65 on MMP-2 promoter), migration assay\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP on MMP-2 promoter plus multi-step pharmacological epistasis with functional readout, single lab\",\n      \"pmids\": [\"21453685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Zebrafish MMP-2 (>80% identity to human MMP-2) is expressed from the one-cell stage (maternal origin); morpholino antisense knockdown causes a truncated embryonic axis beginning at 12 h, demonstrating an essential role for MMP-2 in early vertebrate embryogenesis—in contrast to mouse knockout studies.\",\n      \"method\": \"In situ hybridization, RT-PCR, gelatin zymography, antisense morpholino oligonucleotide injection, developmental axis marker analysis\",\n      \"journal\": \"Development genes and evolution\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino loss-of-function with morphological and marker-based phenotypic readout, single lab\",\n      \"pmids\": [\"12898250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MMP-2 deficiency in Purkinje cells of MMP-2−/− mice leads to reduced soma growth, smaller dendritic trees, decreased arborization, and increased spine density with reduced spine length; proteomics identified elevated phospho-CRMP1 in MMP-2−/− cerebella as a potential mediator of aberrant dendritogenesis.\",\n      \"method\": \"2D-DIGE proteomics, Western blot, immunohistochemistry, morphometric analysis, MMP-2 knockout mice\",\n      \"journal\": \"Brain structure & function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with quantitative morphometric phenotyping and proteomics, single lab\",\n      \"pmids\": [\"24652381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Estrogen (E2) at 10−10 M increases MMP-2 activity (~2.2-fold) and protein expression (~2.5-fold) in retinal pigment epithelium cells; this effect is abolished by the NF-κB inhibitor PDTC, placing NF-κB downstream of estrogen receptor activation and upstream of MMP-2 regulation.\",\n      \"method\": \"Zymography, Western blot, PDTC inhibition, estrogen receptor transfection reporter assay\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological NF-κB inhibition with dual protein/activity readout, single lab\",\n      \"pmids\": [\"12506055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In rheumatoid arthritis synovial fibroblasts, recombinant MMP-2 inactivates NF-κB and suppresses cartilage degradation, whereas endogenous MMP-2 suppression (siRNA) activates NF-κB and increases TNF-α and IL-17 secretion, revealing an anti-inflammatory function of MMP-2 distinct from the pro-inflammatory role of MMP-9.\",\n      \"method\": \"siRNA knockdown, recombinant protein treatment, specific inhibitors, NF-κB activation Western blot, ELISA for cytokines, cartilage degradation assay (1,9-DMMB), invasion and migration assays\",\n      \"journal\": \"Rheumatology (Oxford)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA + recombinant protein rescue + specific inhibitors, multiple functional readouts, single lab\",\n      \"pmids\": [\"24982240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HIF-2α (not HIF-1α) mediates hypoxia-induced MMP-2 upregulation in scleral fibroblasts; HIF-2A siRNA silencing abolishes hypoxia-induced MMP-2 expression and FD-induced collagen degradation and myopia development in mice, whereas HIF-1α knockdown does not affect MMP-2 upregulation.\",\n      \"method\": \"HIF-2A siRNA in human scleral fibroblasts (1% O2), AAV8-Cre scleral injection in HIF-2αfl/fl and HIF-1αfl/fl mice, Western blot, qRT-PCR, pulse refraction measurement\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional in vivo knockout epistasis plus in vitro siRNA, single lab\",\n      \"pmids\": [\"35802383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In iPSC-derived cortical neurons with MAPT mutations, elevated MMP-2 (and MMP-9) levels contribute to stress-induced neuronal death; MMP-2/9 inhibitors protect patient neurons, and recombinant MMP-2 decreases neuronal survival, demonstrating a direct cytotoxic function of secreted MMP-2 toward neurons.\",\n      \"method\": \"iPSC-derived cortical neurons, MMP inhibitor treatment, recombinant MMP-2/9 treatment, ERK pathway inhibitor, cell viability assay\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — recombinant protein gain-of-function and inhibitor rescue in human iPSC model, single lab\",\n      \"pmids\": [\"27594586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MMP-2 promotes murine adipogenesis: MMP-2-deficient MEFs show 90% reduced lipid accumulation and reduced pro-adipogenic marker expression; MMP-2 shRNA knockdown in 3T3-F442A preadipocytes impairs differentiation while MMP-2 overexpression markedly enhances it.\",\n      \"method\": \"Mmp2 KO MEF differentiation, shRNA knockdown, Mmp2 overexpression, oil-red-O staining, marker gene expression, in vivo fat pad model\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO plus gain- and loss-of-function in cell lines with in vivo follow-up, single lab\",\n      \"pmids\": [\"25869489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MMP-2 siRNA knockdown in glioma cells blocks radiation-enhanced invasion by inhibiting VEGF, VEGFR-2, pVEGFR-2, p-FAK, and p-p38 signaling and induces apoptosis; in vivo MMP-2 siRNA significantly reduces intracranial tumor growth.\",\n      \"method\": \"Plasmid-mediated siRNA, Western blot, invasion/migration assays, TUNEL staining, intracranial xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with multiple downstream signaling and functional readouts plus in vivo validation, single lab\",\n      \"pmids\": [\"21698233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"S100A8/A9 expression selectively down-regulates MMP-2 expression and activity in carcinoma cells; conversely, silencing S100A8/A9 increases MMP-2 activity and invasion; MMP-2 silencing reduces the malignant phenotype, and 3D collagen growth increases MMP-2 expression relative to 2D.\",\n      \"method\": \"Transfection of S100A8/A9 expression constructs, siRNA knockdown of S100A8/A9 and MMP-2, zymography, invasion/migration assays, 3D collagen substrate\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss of function with mechanistic activity readouts, single lab\",\n      \"pmids\": [\"25236491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In fibroblasts, myofibroblast contractility (driven by F-actin assembly, serum, or TGF-β) suppresses MMP-2 expression inversely to smooth muscle α-actin expression; MRTF-A/B knockdown (myocardin-like factors that drive contractile gene expression) relieves serum/TGF-β-induced MMP-2 suppression, linking the actin–MRTF–contractile gene axis to MMP-2 regulation.\",\n      \"method\": \"3D collagen lattice under tension vs. stress release, 2D culture with pharmacological F-actin modulators, RNAi knockdown of MRTF-A/B, Western blot\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis combined with pharmacological and mechanical perturbations, single lab\",\n      \"pmids\": [\"22449415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BMP2 induces MMP-2 secretion and activation in pancreatic PANC-1 cells via ROS accumulation and ERK phosphorylation; ROS scavenger 2-MPG or ERK inhibitor PD98059 reduces BMP2-induced MMP-2 activation and cell invasion.\",\n      \"method\": \"BMP2 stimulation, ROS scavenger and ERK inhibitor treatment, zymography, Western blot, invasion assay\",\n      \"journal\": \"Frontiers in bioscience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological pathway inhibition without genetic epistasis, single lab, single set of methods\",\n      \"pmids\": [\"22652796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MMP-2 is expressed as an active form on the membrane of human cervical cancer cells in a complex involving αvβ3 integrin and MT1-MMP, consistent with the αvβ3/MT1-MMP/TIMP-2 trimolecular activation complex mediating MMP-2 activation at the tumor cell surface.\",\n      \"method\": \"Subcellular membrane fractionation, Western blot, immunoprecipitation (MMP-2 with αvβ3 integrin), MT1-MMP expression analysis\",\n      \"journal\": \"Journal of environmental pathology, toxicology and oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP without functional perturbation experiments, single lab\",\n      \"pmids\": [\"14533872\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MMP-2 (gelatinase A) is a zinc-dependent endopeptidase secreted as a latent proenzyme (proMMP-2) that is activated extracellularly via a trimolecular MT1-MMP/TIMP-2/proMMP-2 cell-surface complex requiring collagen I or β1 integrin signals; its activity is further regulated by multi-site phosphorylation (negatively, by PKC) and by extracellular c-Src–mediated phosphorylation of TIMP-2 (positively, enhancing inhibition and controlling proMMP-2 activation); beyond ECM remodeling, MMP-2 also localizes intracellularly to the mitochondria-associated membrane (where it can cleave calreticulin), to sarcomere Z-lines and mitochondria of skeletal muscle, and to the platelet cytosol (translocating to the membrane upon collagen-stimulated aggregation); transcription is driven by ERK/Sp1 downstream of Src, by PKA/Ets-2/p53 in trophoblasts, and by HIF-2α under hypoxia, while contractile MRTF-A/B signaling suppresses it; genetically, MMP-2 acts upstream of TGF-β activation and noncanonical Erk1/2/Smad2 signaling in Marfan aortopathy, exerts a cardioprotective anti-inflammatory role in cytokine-driven cardiomyopathy, promotes adipogenesis and neural dendritogenesis, and converts pro-NGF to NGF in sympathetic neurons to control nerve sprouting.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MMP-2 (gelatinase A) is a zinc-dependent endopeptidase that remodels the extracellular matrix and, through proteolysis of structural and signaling proteins, governs cell invasion, fibrosis, vascular and cardiac homeostasis, and neuronal and adipocyte differentiation [#8, #28]. It is secreted as a latent proenzyme whose activation occurs at the cell surface through a membrane-bound MT1-MMP (MMP-14) mechanism that requires collagen I or \\u03b21-integrin cues, generating active enzyme that associates with the tumor or fibroblast surface [#9, #13, #6]; this activation is controlled by TIMP-2, whose binding to proMMP-2 and inhibitory potency depend on extracellular c-Src phosphorylation at Y90 [#1], while multi-site phosphorylation of MMP-2 itself, including by PKC, negatively regulates its catalytic activity [#0]. Once active, MMP-2 cleaves ECM substrates such as fibronectin, vitronectin, and collagen I into fragments that drive integrin-dependent adhesion and metastasis [#8], and it processes non-ECM substrates including pro-NGF to mature NGF to control sympathetic nerve sprouting [#20]. MMP-2 transcription is induced by Src via the ERK/Sp1 axis [#5], by PKA through Ets-2 and phospho-p53 in trophoblasts [#16], and by HIF-2\\u03b1 under hypoxia [#26], and is suppressed by the actin\\u2013MRTF-A/B contractile gene program [#31]. Beyond its canonical extracellular role, MMP-2 localizes intracellularly to the mitochondria-associated membrane where it cleaves calreticulin [#3], to sarcomere Z-lines, nuclear membrane, and mitochondria of skeletal muscle [#17], and to the platelet cytosol from which it translocates to the membrane upon collagen-stimulated aggregation [#2]. Genetically, MMP-2 acts upstream of TGF-\\u03b2 activation and noncanonical Erk1/2/Smad2 signaling in Marfan aortopathy [#4], exerts a cardioprotective, anti-inflammatory role in cytokine-driven cardiomyopathy [#10], and promotes adipogenesis [#28] and Purkinje-cell dendritogenesis [#23].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established that MMP-2 and MT1-MMP are co-expressed at sites of tissue invasion alongside their collagen IV substrate, framing the membrane activation axis in a physiological invasion context.\",\n      \"evidence\": \"In situ hybridization and immunostaining of extravillous cytotrophoblasts in placental bed\",\n      \"pmids\": [\"9294857\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Co-localization only, no functional perturbation\", \"Did not demonstrate direct activation event\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed MMP-2 has an intracellular pool that mobilizes upon stimulation, the first hint that its biology extends beyond constitutive secretion.\",\n      \"evidence\": \"Immunogold EM and flow cytometry of resting and collagen-aggregated platelets\",\n      \"pmids\": [\"9843180\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of cytosol-to-membrane translocation unknown\", \"How cytosolic MMP-2 escapes the secretory pathway unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified collagen I and \\u03b21 integrin as the specific signals triggering membrane-bound proMMP-2 activation on fibroblasts, defining the activation triggers.\",\n      \"evidence\": \"Carcinoma\\u2013fibroblast co-culture with collagen gel stimulation and anti-\\u03b21 integrin perturbation, zymography\",\n      \"pmids\": [\"10408832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Membrane metalloproteinase identity inferred, not directly proven here\", \"Single lab cell-based reconstitution\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected mechanical stretch to MMP-2 activation via MT1-MMP and EMMPRIN, linking biophysical cues to the activation machinery.\",\n      \"evidence\": \"Cyclic stretch of lung endothelial cells with MMP inhibitor, zymography and RT-PCR\",\n      \"pmids\": [\"12456388\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MT1-MMP role inferred from pharmacological inhibition\", \"EMMPRIN mechanistic link correlative\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the transcriptional route from Src oncogene through ERK to the Sp1 site on the MMP-2 promoter, defining an inducible expression pathway.\",\n      \"evidence\": \"Promoter-reporter mutagenesis, EMSA, dominant-negative ERK-2 in cells\",\n      \"pmids\": [\"16453304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address activation/secretion regulation\", \"Single-cell-type promoter analysis\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed phosphorylation as a direct post-translational brake on MMP-2 catalysis, adding a layer of regulation beyond proenzyme activation.\",\n      \"evidence\": \"MS site mapping, in vitro PKC phosphorylation, alkaline phosphatase dephosphorylation, activity assays\",\n      \"pmids\": [\"17435175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo kinase(s) for each site not identified\", \"Phosphatase counter-regulators unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that active MMP-2 cleaves ECM proteins into pro-invasive fragments and is required in vivo for metastatic colonization, anchoring its catalytic role to disease outcome.\",\n      \"evidence\": \"3D omentum culture, ECM cleavage assays, siRNA, blocking antibody, xenograft\",\n      \"pmids\": [\"19221481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integrin receptors for cleaved fragments not individually defined\", \"Relative contribution of each ECM substrate unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed MMP-2 genetically upstream of TGF-\\u03b2 activation and noncanonical Erk1/2/Smad2 signaling in aortic disease, establishing a causal disease mechanism.\",\n      \"evidence\": \"MMP-2 KO crossed into Fbn1(mgR/mgR) Marfan mice, survival, zymography, pathway Western blots\",\n      \"pmids\": [\"22550139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TGF-\\u03b2 latency substrate of MMP-2 not identified\", \"Cell type responsible not pinpointed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a precise intracellular niche for MMP-2 at the mitochondria-associated membrane with calreticulin as a candidate substrate, expanding its role into ER\\u2013mitochondrial Ca2+ biology.\",\n      \"evidence\": \"Immunogold EM, MMP-2:HaloTag imaging, subcellular fractionation, in vitro proteolysis of calreticulin\",\n      \"pmids\": [\"24375642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of calreticulin cleavage untested\", \"How MMP-2 reaches the MAM cytoplasmic face unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed extracellular c-Src phosphorylates TIMP-2 at Y90 to control its binding to proMMP-2 and inhibitory potency, identifying a phosphorylation switch on the inhibitor side of the activation complex.\",\n      \"evidence\": \"Extracellular kinase assay, Y90 non-phosphorylatable mutant, co-IP, inhibition assays\",\n      \"pmids\": [\"30227959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of extracellular Src phosphorylation untested\", \"Phosphatase reversing Y90 unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified HIF-2\\u03b1 (not HIF-1\\u03b1) as the hypoxia-responsive transcriptional driver of MMP-2 in scleral fibroblasts and an MMP-2/eNOS interaction in vascular aging, diversifying its regulatory and substrate repertoire.\",\n      \"evidence\": \"HIF-2A siRNA and conditional knockout mice; MMP-2 siRNA, co-IP with eNOS, desmosine and cGMP measurement\",\n      \"pmids\": [\"35802383\", \"34586381\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MMP-2/eNOS interaction surface and functional consequence not structurally defined\", \"Whether eNOS is a cleavage substrate or binding partner only unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MMP-2 partitions between extracellular and intracellular (MAM, sarcomere, platelet cytosol) pools, and how its non-ECM substrate set is selected in each compartment, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for intracellular targeting versus secretion\", \"Compartment-specific substrate repertoire largely uncharacterized\", \"Physiological in vivo substrates of intracellular MMP-2 not validated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [8, 20, 3]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 8, 17]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [17, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [8, 9, 20]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 17, 11]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 33]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [8, 9, 13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 8, 10]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 16, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 21, 32]}\n    ],\n    \"complexes\": [\"MT1-MMP/TIMP-2/proMMP-2 activation complex\"],\n    \"partners\": [\"MMP14\", \"TIMP2\", \"SRC\", \"ITGAV\", \"ITGB3\", \"NOS3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}