{"gene":"ADAMTS1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1998,"finding":"ADAMTS-1 protein is secreted and anchors to the extracellular matrix through its thrombospondin type I motifs and spacer region, with binding mediated through sulfated glycosaminoglycans such as heparan sulfate (displaced by heparin treatment). Deletion mutant analysis identified both the spacer region and three TSP type I motifs in the C-terminal region as necessary for tight ECM interaction.","method":"Transient expression in COS-7 cells, deletion mutant analysis, heparin displacement assay, cell fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct biochemical dissection with deletion mutants and functional displacement assay","pmids":["9593739"],"is_preprint":false},{"year":1999,"finding":"METH-1 (human ADAMTS1) is a secreted, proteolytically processed protein that inhibits endothelial cell proliferation and suppresses FGF-2- and VEGF-induced angiogenesis in vivo, with no effect on fibroblast or smooth muscle cell growth, establishing endothelial-specific anti-angiogenic activity.","method":"Recombinant protein production, cornea pocket assay, chorioallantoic membrane assay, endothelial cell proliferation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple in vitro and in vivo functional assays with recombinant protein","pmids":["10438512"],"is_preprint":false},{"year":2000,"finding":"METH-1/ADAMTS1 is secreted as a pro-form that undergoes two consecutive proteolytic processing steps: furin cleaves the prodomain to release the p87 active form, and matrix metalloproteases (MMP-2, MMP-8, MMP-15) perform a second cleavage of p87 to release a p65 form that lacks two C-terminal thrombospondin repeats and shows reduced anti-angiogenic activity.","method":"Furin inhibitor treatment, purified furin incubation, MMP inhibitor treatment, recombinant MMP cleavage assay, heparin-binding analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with purified enzymes and inhibitors, two processing steps characterized","pmids":["10944521"],"is_preprint":false},{"year":2000,"finding":"ADAMTS-1 is a transcriptional target of the progesterone receptor (PR) in granulosa cells of preovulatory follicles following the LH surge; PR knockout mice fail to induce ADAMTS-1 mRNA, and ADAMTS-1-null mice show growth retardation, impaired female fertility, renal calyceal enlargement with fibrosis, and abnormal adrenal medullary architecture, establishing essential roles in growth, organ morphology, and ovulation.","method":"PR knockout mouse model, gene targeting (ADAMTS-1 null mice), histology, Northern blot","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple KO mouse models with defined phenotypic readouts replicated across labs","pmids":["10811842","10781075"],"is_preprint":false},{"year":2002,"finding":"ADAMTS1 cleaves aggrecan at multiple sites including a previously identified site (E373-A) and additional new sites, classifying it as an aggrecanase. A point mutation in the zinc-binding domain abolishes catalytic activity. Latency is conferred by the prodomain (furin cleavage site mutant retains latency). Activity is inhibited by TIMP-2, TIMP-3, and a specific monoclonal antibody.","method":"In vitro protease assay on purified aggrecan, zinc-binding domain point mutagenesis, furin cleavage site mutagenesis, TIMP inhibition assay, peptide substrate activity assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with active-site mutagenesis confirming catalytic mechanism","pmids":["12054629"],"is_preprint":false},{"year":2003,"finding":"Pro-ADAMTS-1 (110 kDa) is produced in mural granulosa cells and localized to cytoplasmic secretory vesicles; the mature 85-kDa form (prodomain-truncated) accumulates in the ECM of the cumulus-oocyte complex during matrix expansion. ADAMTS-1 cleaves versican in the COC matrix generating an N-terminal DPEAAE neoepitope fragment, and this cleavage is reduced in PRKO mouse ovaries deficient in ADAMTS-1.","method":"Immunofluorescence localization, Western blot of ovarian tissue, anti-neoepitope antibody detection of versican cleavage in PRKO vs. wild-type ovaries","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct protein localization combined with substrate cleavage verified in vivo with KO model","pmids":["12907688"],"is_preprint":false},{"year":2003,"finding":"ADAMTS1 directly binds VEGF165 (but not VEGF121, which lacks the heparin-binding domain) via its carboxyl-terminal region, sequestering it and blocking VEGFR2 phosphorylation and endothelial cell proliferation. Inhibition is reversible; active VEGF can be recovered from the complex. ADAMTS1 and VEGF165 co-immunoprecipitate from tumor extracts.","method":"Co-immunoprecipitation, chemical cross-linking, domain deletion analysis, VEGFR2 phosphorylation assay, endothelial proliferation assay, tumor extract co-IP","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal binding assays combined with functional readout (VEGFR2 phosphorylation, proliferation) and structure-function analysis","pmids":["12716911"],"is_preprint":false},{"year":2003,"finding":"Adamts-1 null female mice are subfertile due to failure of mature oocytes to be released from ovarian follicles (ovulatory failure), while uterine function and embryo implantation are normal, establishing that ADAMTS-1 is specifically required for the tissue remodeling process of ovulation.","method":"Adamts-1 knockout mouse model, histology, fertility assay","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — independent KO mouse generation with defined cellular phenotype, replicating prior findings","pmids":["14668204"],"is_preprint":false},{"year":2004,"finding":"Furin is the principal convertase cleaving proADAMTS-1 at Arg235 (RKKR235) in the Golgi apparatus prior to secretion. The prodomain also contains conserved cysteine residues (C106, C125, C181) and other residues (Y108, G110, 137-144 sequence) required for proper biosynthesis. PACE4 and PC6B can also process proADAMTS-1 but less efficiently than furin.","method":"Site-directed mutagenesis of furin recognition sequences and conserved prodomain residues, biosynthetic labeling in HEK293 cells, Brefeldin A/monensin Golgi disruption","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis combined with biochemical processing assays","pmids":["15184385"],"is_preprint":false},{"year":2004,"finding":"ADAMTS-1 gene transcription in granulosa cells is coordinately regulated by LH (via cAMP/PKA/Sp1/Sp3 and nuclear factor 1-like binding sites) and progesterone receptor (PRA/PRB acting as inducible coregulators via C/EBPβ and Sp1/Sp3 binding sites in the ADAMTS-1 promoter), despite absence of a consensus PR response element.","method":"Promoter-luciferase reporter assays with truncation and site-specific mutations, transfection of PRA/PRB expression vectors in granulosa cells, PR antagonist ZK98299 treatment","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — multiple promoter mutants with defined transcription factor binding, validated in primary cell culture","pmids":["15256533"],"is_preprint":false},{"year":2006,"finding":"ADAMTS-1 cleaves versican at multiple sites in cultured human aortic VSMCs and promotes VSMC migration, suggesting a role in atherogenesis through ECM remodeling. Transgenic overexpression in apoE-deficient mice increases intimal hyperplasia in the carotid artery flow cessation model.","method":"In vitro versican cleavage assay with peptide substrates, carotid artery flow cessation model in transgenic mice, VSMC migration assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic model plus in vitro substrate cleavage, single lab","pmids":["15539621"],"is_preprint":false},{"year":2006,"finding":"ADAMTS1 uses its proteolytic activity to promote pulmonary metastasis via shedding of transmembrane precursors of heparin-binding EGF (HB-EGF) and amphiregulin (AR), activating EGFR and ErbB-2. A catalytically dead mutant (ADAMTS-1E/Q) inhibits metastasis. Auto-proteolytic cleavage of ADAMTS1 generates N- and C-terminal fragments containing TSP motifs that inhibit metastasis and suppress ERK1/2 activation by HB-EGF/AR.","method":"Overexpression of full-length, catalytically dead mutant, and autocleavage fragments; in vivo pulmonary metastasis assays; EGFR/ErbB-2 phosphorylation assays; ERK1/2 activation assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — multiple constructs with defined mechanisms tested in vivo and in vitro, orthogonal readouts","pmids":["16314835"],"is_preprint":false},{"year":2006,"finding":"ADAMTS1 interacts with and cleaves tissue factor pathway inhibitor-2 (TFPI-2), removing a protease-sensitive C-terminal region and altering TFPI-2's binding properties and extracellular localization, identified by yeast two-hybrid screen and confirmed by multiple biochemical assays.","method":"Yeast two-hybrid screen, co-immunoprecipitation, cell-based assays, in vitro cleavage assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — substrate identified by unbiased screen and validated by multiple independent assays including direct cleavage","pmids":["16641089"],"is_preprint":false},{"year":2006,"finding":"ADAMTS1 is required for structural maintenance of ovarian follicular basement membranes during folliculogenesis and for ovarian lymphangiogenesis; ADAMTS-1-null ovaries show follicle dysmorphogenesis with ECM disruption and severely delayed lymphatic development beginning at antrum formation.","method":"ADAMTS-1 null mouse histology, immunostaining of basement membrane components and cell-type markers (Cyp-17, AMH), lymphatic vessel immunostaining","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function mouse model with defined molecular markers and cellular phenotypes","pmids":["17097630"],"is_preprint":false},{"year":2006,"finding":"Proteomic (DIGE) screening identified nidogen-1, nidogen-2, desmocollin-3, dystroglycan 1, and Mac-2-binding protein as putative ADAMTS1 substrates; nidogen-1 and nidogen-2 were validated as substrates by immunochemical analysis.","method":"DIGE proteomics of conditioned medium from ADAMTS1-overexpressing cells, mass spectrometry, immunochemical validation","journal":"Proteomics","confidence":"Medium","confidence_rationale":"Tier 2-3 — unbiased proteomic identification with partial immunochemical validation, single lab","pmids":["16511810"],"is_preprint":false},{"year":2007,"finding":"Crystal structures of human ADAMTS-1 reveal a conserved zinc metalloprotease catalytic domain with a larger S1' selectivity pocket than ADAM33 and an unexpected double calcium-binding site. The 'disintegrin-like' domain is structurally homologous to cysteine-rich domains of other metalloproteinases (not classical disintegrin domains), and it stacks against the active site suggesting a possible regulatory role. Structures obtained in apo form and in complex with inhibitor marimastat.","method":"X-ray crystallography (crystal structures of catalytic and disintegrin-like domains, with and without marimastat)","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structures with inhibitor complex, multiple crystal forms","pmids":["17897672"],"is_preprint":false},{"year":2008,"finding":"Endocardial Brg1 (chromatin remodeling protein) represses ADAMTS1 expression in the endocardium overlying developing trabeculae; repression of ADAMTS1 allows establishment of an ECM environment (cardiac jelly) that supports trabecular growth. Loss of Brg1 leads to ADAMTS1 upregulation, cardiac jelly degradation, and impaired trabeculation.","method":"Conditional Brg1 knockout mouse (endocardium-specific), genetic epistasis between Brg1 and ADAMTS1, rescue by ADAMTS1 deletion, histology and molecular analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with conditional KO, mechanistic link between chromatin regulator and substrate protease","pmids":["18267097"],"is_preprint":false},{"year":2008,"finding":"ADAMTS1 cleaves the ectodomain of syndecan-4, a membrane-bound heparan sulfate proteoglycan, resulting in altered cytoskeletal organization, loss of focal adhesions, and increased cell migration. ADAMTS1 proteolytic action on syndecan-4 mimics the phenotype of genetic syndecan-4 deletion.","method":"In vitro cleavage assay, cytoskeleton immunostaining, focal adhesion analysis, migration assay in syndecan-4 null cells","journal":"The international journal of biochemistry & cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct cleavage demonstrated, functional equivalence confirmed with KO cells","pmids":["18775505"],"is_preprint":false},{"year":2009,"finding":"ADAMTS1 and MMP1 orchestrate a paracrine signaling cascade in bone metastasis: ADAMTS1 proteolytically releases membrane-bound EGF-like ligands (amphiregulin, HB-EGF, TGFα) from tumor cells, which suppress osteoprotegerin (OPG) in osteoblasts and potentiate osteoclast differentiation, promoting osteolytic bone metastasis.","method":"In vitro shedding assays, EGFR signaling assays in osteoblasts, osteoclastogenesis assays, EGFR inhibitor treatment, bone metastasis mouse model","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo assays establishing pathway mechanism with pharmacological intervention","pmids":["19608765"],"is_preprint":false},{"year":2009,"finding":"ADAMTS1 cleaves semaphorin 3C, releasing it from the extracellular matrix, and this cleavage promotes migration of breast cancer cells. Identified by two independent proteomic approaches (DIGE and SILAC).","method":"DIGE proteomics, SILAC, substrate validation assays, cell migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — two independent proteomic approaches identifying same substrate, with functional migration readout","pmids":["19915008"],"is_preprint":false},{"year":2009,"finding":"ADAMTS1 is a hypoxia-inducible gene specifically in endothelial cells (not other cell types); HIF-1 binds to HIF binding sites in the ADAMTS1 promoter under hypoxia (confirmed by ChIP). Hypoxia-induced expression is mediated via the PI3K pathway. Recombinant ADAMTS1 promotes endothelial cell migration under hypoxic conditions.","method":"RT-PCR and Western blot in multiple cell types, CoCl2 hypoxia mimetic, PI3K inhibitor (LY294002), secreted luciferase reporter assay, chromatin immunoprecipitation (ChIP) for HIF-1, endothelial migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — ChIP confirms HIF-1 binding, multiple supporting methods, functional recombinant protein assay","pmids":["19349275"],"is_preprint":false},{"year":2012,"finding":"Pericyte-derived TIMP3 stabilizes and ADAMTS1 destabilizes capillary tubular networks in 3D gel assays. Kidney pericytes rapidly activate ADAMTS1 and downregulate TIMP3 after injury, promoting detachment and differentiation into myofibroblasts. TIMP3-null mice show spontaneous microvascular phenotype and exaggerated injury response.","method":"3D capillary tube formation/stabilization assay with pericytes, TIMP3-null mouse kidney phenotyping, gene expression analysis","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 — direct functional assay in 3D system combined with KO mouse phenotyping, showing opposing roles of ADAMTS1 and TIMP3","pmids":["22383695"],"is_preprint":false},{"year":2013,"finding":"ADAMTS1 acts as a tumor suppressor in breast carcinoma by cleaving nidogen-1 and nidogen-2 from vascular basement membranes, causing vessel morphological alterations and decreased vessel density. Increased ADAMTS1 expression leads to complete inhibition of tumor xenograft growth.","method":"Tumor xenograft model, immunofluorescence of vascular structures, nidogen cleavage assay, tumor vessel density analysis","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo xenograft with substrate (nidogen) cleavage linked to functional outcome, single lab","pmids":["23681936"],"is_preprint":false},{"year":2016,"finding":"SPARC treatment of cardiac fibroblasts increases secretion of both collagen I and ADAMTS1 (both 110-kDa latent and 87-kDa active forms) and activates TGF-β1-Smad2 signaling. An ADAMTS1-blocking antibody suppresses SPARC-induced collagen I secretion, establishing that SPARC promotes cardiac collagen deposition through ADAMTS1.","method":"Cardiac fibroblast stimulation with recombinant SPARC, ADAMTS1-blocking antibody, Western blot of conditioned media, picrosirius red collagen staining in aged WT and SPARC-null mice","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — blocking antibody establishes ADAMTS1 as downstream effector of SPARC, corroborated by in vivo SPARC-null mouse data","pmids":["27143554"],"is_preprint":false},{"year":2017,"finding":"Macrophage-released ADAMTS1 promotes satellite cell (muscle stem cell) activation after muscle injury by targeting NOTCH1 as a metalloproteinase substrate, reducing Notch signaling and thereby increasing satellite cell activation. Overexpression of ADAMTS1 in macrophages in vivo is sufficient to increase satellite cell activation and improve muscle regeneration.","method":"In vivo macrophage-specific ADAMTS1 overexpression, satellite cell activation quantification, Notch signaling assays, identification of Notch1 as ADAMTS1 substrate","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo gain-of-function, substrate identification (Notch1), defined downstream signaling pathway, multiple methods","pmids":["28939843"],"is_preprint":false},{"year":2017,"finding":"Genetic haploinsufficiency of Adamts1 in mice causes thoracic aortic aneurysms and dissections (TAAD) similar to Marfan syndrome, mediated by elevated NOS2 and nitric oxide levels. Pharmacological or genetic inhibition of NOS2 protects Adamts1-haploinsufficient mice and MFS mice from aortic pathology and rapidly reverses aortic dilation.","method":"Adamts1 haploinsufficient and Nos2 knockout mouse models, aortic pathology quantification, pharmacological NOS2 inhibition, measurement of nitric oxide/NOS2 levels","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis (double mutants) and pharmacological rescue establish ADAMTS1-NOS2 axis, strong in vivo evidence","pmids":["28067899"],"is_preprint":false},{"year":2016,"finding":"Adamts1 (targeted by miR-181d) impairs adipocyte lineage commitment through its metalloprotease activity by remodeling ECM components and activating FAK-ERK signaling. Adipose tissue-specific ablation of Adamts1 increases adipose mass, reduces insulin sensitivity, and disrupts lipid homeostasis.","method":"Forced expression and siRNA knockdown of Adamts1, catalytically inactive mutant, adipogenesis assay, FAK-ERK signaling measurements, adipose-specific conditional KO mouse","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — catalytic mutant controls establish mechanism, pathway defined by signaling assays, in vivo KO phenotype","pmids":["27447109"],"is_preprint":false},{"year":2020,"finding":"ADAMTS1 and syndecan-4 functionally interact in regulating endothelial cell adhesion, migration, and angiogenesis. ADAMTS1 knockdown reduces cell surface syndecan-4 via increased MMP9 activity. Both knockdowns enhance VEGFA164 responses and aortic ring sprouting. The altered adhesive phenotype is matrix-dependent and correlates with loss of fibulin-1 (an extracellular co-factor for ADAMTS1 known to inhibit migration) from the conditioned matrix.","method":"siRNA knockdown of ADAMTS1 and syndecan-4, MMP9 activity assay, VEGF signaling assays, aortic ring sprouting assay, cell migration assay on fibronectin, cell-conditioned matrix plating experiments","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — multiple knockdown experiments with defined molecular readouts (MMP9, fibulin-1), functional convergence shown, single lab","pmids":["32269093"],"is_preprint":false},{"year":2021,"finding":"Label-free quantitative proteomics identified 21 novel ADAMTS1 cleavage sites in versican V1 beyond the canonical Glu441-Ala442 site, using LC-MS/MS of digests with active versus catalytically inactive ADAMTS1. ADAMTS1/4/5 share a preference for P1-Glu residues in proteoglycan substrates.","method":"In vitro recombinant versican digestion with active and catalytically inactive ADAMTS1, label-free LC-MS/MS, z-score statistical approach for cleavage site ranking","journal":"Journal of proteomics","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with inactive enzyme controls, quantitative proteomics rigorously applied","pmids":["34450332"],"is_preprint":false},{"year":2014,"finding":"ADAMTS1 inhibits lymphangiogenesis by binding VEGFC and attenuating VEGFR3 phosphorylation in lymphatic endothelial cells (HMVEC-dLy), reducing proliferation and tube formation. ADAMTS1-VEGFC complex formation confirmed by immunoprecipitation.","method":"Adenoviral ADAMTS1 gene transduction in HMVEC-dLy, proliferation and tube formation assays, VEGFR3 phosphorylation assay, immunoprecipitation of ADAMTS1-VEGFC complex","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding (Co-IP) and functional inhibition of VEGFR3 signaling, single lab","pmids":["24631293"],"is_preprint":false}],"current_model":"ADAMTS1 is a secreted, furin-processed zinc metalloprotease that anchors to the ECM via its C-terminal TSP motifs and spacer region, where it cleaves proteoglycan substrates (aggrecan, versican at multiple Glu-X sites), basement membrane components (nidogen-1/2), and signaling molecules (syndecan-4, semaphorin 3C, NOTCH1, EGF-like ligands); it sequesters VEGF165 and VEGFC through its C-terminal domain to inhibit angiogenesis and lymphangiogenesis via VEGFR2/VEGFR3 blockade, is transcriptionally regulated by LH/progesterone receptor/HIF-1/Brg1 in a context-dependent manner, and its haploinsufficiency causes thoracic aortic disease through an ADAMTS1-NOS2 axis while its metalloprotease activity drives diverse processes including ovulation, satellite cell activation via Notch cleavage, and ECM-dependent regulation of adipogenesis and cardiac fibrosis."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing how ADAMTS1 is retained in the extracellular space resolved a basic question about its localization: the C-terminal TSP motifs and spacer region mediate ECM anchoring through sulfated glycosaminoglycan interactions.","evidence":"Deletion mutant analysis and heparin displacement in COS-7 cells","pmids":["9593739"],"confidence":"High","gaps":["Specific GAG-binding residues not mapped","In vivo ECM anchoring not demonstrated"]},{"year":1999,"claim":"Demonstrating that recombinant ADAMTS1 suppresses FGF-2- and VEGF-induced angiogenesis with endothelial specificity established it as an anti-angiogenic factor, raising the question of mechanism.","evidence":"Cornea pocket assay, chorioallantoic membrane assay, endothelial proliferation assay with purified protein","pmids":["10438512"],"confidence":"High","gaps":["Mechanism of endothelial specificity unknown","Whether catalytic activity was required not tested"]},{"year":2000,"claim":"Identification of two sequential processing steps — furin cleavage of the prodomain and MMP-mediated removal of C-terminal TSP repeats — explained how ADAMTS1 transitions from latent to active forms and how its anti-angiogenic potency is modulated post-secretion.","evidence":"In vitro reconstitution with purified furin and MMPs, furin and MMP inhibitors","pmids":["10944521"],"confidence":"High","gaps":["Physiological context of MMP cleavage not established","Processing kinetics in vivo unknown"]},{"year":2000,"claim":"Knockout mouse phenotyping revealed essential in vivo roles in female fertility (ovulatory failure), growth, and organ morphogenesis, and identified progesterone receptor as a transcriptional regulator in granulosa cells.","evidence":"ADAMTS-1-null and PR-null mouse models, Northern blot, histology, fertility assays","pmids":["10811842","10781075","14668204"],"confidence":"High","gaps":["Specific ovulatory substrates not yet identified","Mechanism of renal and adrenal phenotypes unclear"]},{"year":2002,"claim":"In vitro reconstitution with active-site mutants classified ADAMTS1 as a bona fide aggrecanase and showed its catalytic activity is zinc-dependent, latency is prodomain-conferred, and it is inhibited by TIMP-2 and TIMP-3.","evidence":"Purified aggrecan cleavage, zinc-binding domain point mutagenesis, TIMP inhibition assay","pmids":["12054629"],"confidence":"High","gaps":["Relative contribution versus ADAMTS4/5 in cartilage not resolved","No in vivo aggrecanase role demonstrated"]},{"year":2003,"claim":"Two advances addressed the anti-angiogenic mechanism and the ovulatory substrate: ADAMTS1 sequesters VEGF165 via its C-terminal domain blocking VEGFR2 phosphorylation, and it cleaves versican in the cumulus-oocyte complex, linking its protease activity to ovulation.","evidence":"Co-IP, cross-linking, VEGFR2 phosphorylation assay; anti-neoepitope versican detection in PRKO ovaries","pmids":["12716911","12907688"],"confidence":"High","gaps":["Whether VEGF sequestration and protease activity are independent anti-angiogenic mechanisms not resolved","Full set of ovulatory substrates unknown"]},{"year":2004,"claim":"Detailed mapping of furin cleavage at Arg235 in the Golgi and identification of conserved prodomain residues essential for biosynthesis refined the activation mechanism, while promoter dissection revealed LH/cAMP and PR act as cooperative transcriptional regulators through non-canonical binding sites.","evidence":"Site-directed mutagenesis with Brefeldin A/monensin in HEK293; promoter-reporter assays in primary granulosa cells","pmids":["15184385","15256533"],"confidence":"High","gaps":["Prodomain chaperone function not structurally explained","Whether PR acts as direct DNA-binder or coregulator not definitively resolved"]},{"year":2006,"claim":"Expanding the substrate repertoire to nidogens, syndecan-4 ectodomain, EGF-like ligands, and TFPI-2 revealed ADAMTS1 as a broad ECM and cell-surface sheddase, while in vivo studies showed its catalytic activity promotes metastasis through EGFR/ErbB2 activation and is required for ovarian basement membrane integrity and lymphangiogenesis.","evidence":"DIGE proteomics, Y2H screen, catalytically dead mutant in metastasis model, ADAMTS1-null ovarian histology","pmids":["16314835","16511810","16641089","17097630"],"confidence":"High","gaps":["Relative importance of individual substrates in each tissue context unclear","Anti- vs pro-metastatic roles appear context-dependent and unresolved"]},{"year":2007,"claim":"Crystal structures of the catalytic and disintegrin-like domains revealed a distinctive large S1' pocket, double calcium-binding site, and stacking of the disintegrin-like domain against the active site, providing the first structural framework for understanding substrate selectivity.","evidence":"X-ray crystallography with and without marimastat inhibitor","pmids":["17897672"],"confidence":"High","gaps":["No structure of TSP/spacer domains","Structural basis of substrate discrimination versus ADAMTS4/5 not resolved"]},{"year":2008,"claim":"Genetic epistasis in mice established that endocardial Brg1 represses ADAMTS1 to preserve cardiac jelly for trabeculation, demonstrating a chromatin-level control mechanism for ADAMTS1 in cardiac development.","evidence":"Endocardium-specific Brg1 knockout rescued by ADAMTS1 deletion","pmids":["18267097"],"confidence":"High","gaps":["Direct Brg1-ADAMTS1 promoter interaction not shown","Cardiac jelly substrates of ADAMTS1 not identified"]},{"year":2009,"claim":"Identification of HIF-1 as a direct transcriptional activator (by ChIP) in hypoxic endothelium added a third transcriptional axis, while paracrine EGF-like ligand shedding was shown to drive osteolytic bone metastasis by suppressing osteoblast OPG.","evidence":"ChIP for HIF-1, PI3K inhibitor, endothelial migration assay; bone metastasis model with EGFR inhibitor","pmids":["19349275","19608765"],"confidence":"High","gaps":["Integration of HIF-1, PR, and Brg1 transcriptional programs in same tissue not studied","Whether shedding activity is substrate-selective in bone unclear"]},{"year":2014,"claim":"Extending the VEGF sequestration model to VEGFC/VEGFR3 in lymphatic endothelial cells explained the lymphangiogenic defect observed in null mice and broadened the anti-angiogenic mechanism to lymphatic vessels.","evidence":"Co-IP of ADAMTS1-VEGFC complex, VEGFR3 phosphorylation and tube formation assays in HMVEC-dLy","pmids":["24631293"],"confidence":"Medium","gaps":["Domain requirements for VEGFC binding not mapped","In vivo VEGFC sequestration not directly demonstrated"]},{"year":2016,"claim":"ADAMTS1's metalloprotease activity was shown to regulate adipogenesis through ECM remodeling and FAK-ERK signaling, with adipose-specific knockout increasing fat mass, establishing a metabolic role beyond vascular and reproductive biology.","evidence":"Catalytically inactive mutant, adipogenesis assay, adipose-specific conditional KO mouse","pmids":["27447109"],"confidence":"High","gaps":["Specific ECM substrates mediating adipogenesis suppression not identified","Whether FAK-ERK activation is direct or secondary to ECM changes unknown"]},{"year":2017,"claim":"Two landmark studies revealed that ADAMTS1 haploinsufficiency causes thoracic aortic aneurysm through NOS2 upregulation (rescuable by NOS2 inhibition), and that macrophage-released ADAMTS1 activates satellite cells by cleaving NOTCH1, connecting the protease to both vascular disease and muscle regeneration.","evidence":"Adamts1 haploinsufficient × Nos2 KO genetic epistasis with pharmacological rescue; macrophage-specific overexpression with Notch signaling assays","pmids":["28067899","28939843"],"confidence":"High","gaps":["How ADAMTS1 haploinsufficiency leads to NOS2 upregulation mechanistically unresolved","Whether NOTCH1 is cleaved at a specific site by ADAMTS1 not mapped"]},{"year":2021,"claim":"Quantitative proteomics identified >20 novel cleavage sites in versican V1 and established a shared P1-Glu preference among ADAMTS1/4/5, providing a comprehensive cleavage map for the primary proteoglycan substrate.","evidence":"Label-free LC-MS/MS comparing active versus catalytically inactive ADAMTS1 digests of recombinant versican","pmids":["34450332"],"confidence":"High","gaps":["Physiological relevance of individual cleavage sites not determined","Whether all sites are cleaved in vivo unknown"]},{"year":null,"claim":"Key unresolved questions include: the structural basis for substrate selectivity (no full-length structure exists), how the protease-dependent and VEGF-sequestration functions are coordinately regulated in vivo, the mechanism linking ADAMTS1 haploinsufficiency to NOS2 elevation in aortic disease, and whether ADAMTS1 has distinct or redundant roles relative to ADAMTS4/5 in specific tissue contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length ADAMTS1 structure","Catalytic versus non-catalytic functions not separable in vivo","ADAMTS1 versus ADAMTS4/5 redundancy not systematically tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,5,11,12,17,18,19,24,26,28]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[4,15,28]}],"localization":[{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[0,5]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,2,6]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,5,10,14,17,28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,11,18,24,26,29]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,7,16]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,4,8]}],"complexes":[],"partners":["VEGFA","VEGFC","VCAN","ACAN","NID1","SDC4","NOTCH1","TFPI2"],"other_free_text":[]},"mechanistic_narrative":"ADAMTS1 is a secreted zinc metalloprotease that functions as a major extracellular matrix remodeling enzyme regulating angiogenesis, tissue morphogenesis, and proteoglycan turnover. Secreted as a latent proenzyme, it undergoes furin-mediated prodomain cleavage in the Golgi to yield the active p87 form, which anchors to the ECM via C-terminal thrombospondin type I motifs and a spacer region through heparan sulfate interactions; secondary cleavage by MMPs generates a p65 form with reduced anti-angiogenic capacity [PMID:9593739, PMID:10944521, PMID:15184385]. Its catalytic activity cleaves proteoglycans (aggrecan at Glu-X sites, versican at >20 sites), basement membrane nidogens, syndecan-4, semaphorin 3C, NOTCH1, and EGF-like ligand precursors (HB-EGF, amphiregulin), thereby controlling processes from ovulation and cardiac trabeculation to satellite cell activation and bone metastasis [PMID:12054629, PMID:34450332, PMID:18775505, PMID:28939843, PMID:18267097, PMID:19608765]. Independent of catalysis, its C-terminal domain sequesters VEGF165 and VEGFC to block VEGFR2/VEGFR3 signaling and inhibit angiogenesis and lymphangiogenesis, and haploinsufficiency in mice causes thoracic aortic aneurysm through a NOS2-dependent mechanism [PMID:12716911, PMID:24631293, PMID:28067899]."},"prefetch_data":{"uniprot":{"accession":"Q9UHI8","full_name":"A disintegrin and metalloproteinase with thrombospondin motifs 1","aliases":["METH-1"],"length_aa":967,"mass_kda":105.4,"function":"Metalloprotease which cleaves aggrecan, a cartilage proteoglycan, at the '1938-Glu-|-Leu-1939' site (within the chondroitin sulfate attachment domain), and may be involved in its turnover (By similarity). Also cleaves COMP (PubMed:39672391). Has angiogenic inhibitor activity (PubMed:10438512). May play a critical role in follicular rupture (By similarity)","subcellular_location":"Secreted, extracellular space, extracellular matrix","url":"https://www.uniprot.org/uniprotkb/Q9UHI8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADAMTS1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HSP90B1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ADAMTS1","total_profiled":1310},"omim":[{"mim_id":"616020","title":"CYSTEINE/TYROSINE-RICH PROTEIN 1; CYYR1","url":"https://www.omim.org/entry/616020"},{"mim_id":"614545","title":"ENDOPLASMIC RETICULUM MEMBRANE PROTEIN COMPLEX, SUBUNIT 10; EMC10","url":"https://www.omim.org/entry/614545"},{"mim_id":"611681","title":"A DISINTEGRIN-LIKE AND METALLOPROTEINASE WITH THROMBOSPONDIN TYPE 1 MOTIF, 20; ADAMTS20","url":"https://www.omim.org/entry/611681"},{"mim_id":"610113","title":"ADAMTS-LIKE PROTEIN 4; ADAMTSL4","url":"https://www.omim.org/entry/610113"},{"mim_id":"609198","title":"ADAMTS-LIKE PROTEIN 1; ADAMTSL1","url":"https://www.omim.org/entry/609198"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Plasma membrane","reliability":"Uncertain"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"ovary","ntpm":367.9}],"url":"https://www.proteinatlas.org/search/ADAMTS1"},"hgnc":{"alias_symbol":["C3-C5","METH1","KIAA1346"],"prev_symbol":[]},"alphafold":{"accession":"Q9UHI8","domains":[{"cath_id":"3.40.390.10","chopping":"255-476","consensus_level":"high","plddt":91.4256,"start":255,"end":476},{"cath_id":"3.40.1620.60","chopping":"490-556","consensus_level":"high","plddt":87.2658,"start":490,"end":556},{"cath_id":"-","chopping":"622-699","consensus_level":"medium","plddt":84.1901,"start":622,"end":699},{"cath_id":"2.60.120.830","chopping":"725-844","consensus_level":"high","plddt":87.9033,"start":725,"end":844},{"cath_id":"-","chopping":"857-905","consensus_level":"high","plddt":84.6673,"start":857,"end":905},{"cath_id":"2.20.100","chopping":"912-964","consensus_level":"high","plddt":83.5038,"start":912,"end":964},{"cath_id":"2.40.128","chopping":"56-95_123-162","consensus_level":"medium","plddt":83.7786,"start":56,"end":162}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UHI8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UHI8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UHI8-F1-predicted_aligned_error_v6.png","plddt_mean":77.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADAMTS1","jax_strain_url":"https://www.jax.org/strain/search?query=ADAMTS1"},"sequence":{"accession":"Q9UHI8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UHI8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UHI8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UHI8"}},"corpus_meta":[{"pmid":"10781075","id":"PMC_10781075","title":"Progesterone-regulated 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crevicular fluid correlate with vascular endothelial growth factor-A, hypoxia-inducible factor-1α, and clinical parameters in patients with advanced periodontitis.","date":"2019","source":"Journal of periodontology","url":"https://pubmed.ncbi.nlm.nih.gov/31020669","citation_count":22,"is_preprint":false},{"pmid":"24631293","id":"PMC_24631293","title":"ADAMTS1 inhibits lymphangiogenesis by attenuating phosphorylation of the lymphatic endothelial cell-specific VEGF receptor.","date":"2014","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/24631293","citation_count":22,"is_preprint":false},{"pmid":"35117030","id":"PMC_35117030","title":"ADAMTS-1 inhibits angiogenesis via the PI3K/Akt-eNOS-VEGF pathway in lung cancer cells.","date":"2019","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/35117030","citation_count":22,"is_preprint":false},{"pmid":"16303287","id":"PMC_16303287","title":"Differential expression of ADAMTS-1, -4, -5 and 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and anchors to the extracellular matrix through its thrombospondin type I motifs and spacer region, with binding mediated through sulfated glycosaminoglycans such as heparan sulfate (displaced by heparin treatment). Deletion mutant analysis identified both the spacer region and three TSP type I motifs in the C-terminal region as necessary for tight ECM interaction.\",\n      \"method\": \"Transient expression in COS-7 cells, deletion mutant analysis, heparin displacement assay, cell fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct biochemical dissection with deletion mutants and functional displacement assay\",\n      \"pmids\": [\"9593739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"METH-1 (human ADAMTS1) is a secreted, proteolytically processed protein that inhibits endothelial cell proliferation and suppresses FGF-2- and VEGF-induced angiogenesis in vivo, with no effect on fibroblast or smooth muscle cell growth, establishing endothelial-specific anti-angiogenic activity.\",\n      \"method\": \"Recombinant protein production, cornea pocket assay, chorioallantoic membrane assay, endothelial cell proliferation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple in vitro and in vivo functional assays with recombinant protein\",\n      \"pmids\": [\"10438512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"METH-1/ADAMTS1 is secreted as a pro-form that undergoes two consecutive proteolytic processing steps: furin cleaves the prodomain to release the p87 active form, and matrix metalloproteases (MMP-2, MMP-8, MMP-15) perform a second cleavage of p87 to release a p65 form that lacks two C-terminal thrombospondin repeats and shows reduced anti-angiogenic activity.\",\n      \"method\": \"Furin inhibitor treatment, purified furin incubation, MMP inhibitor treatment, recombinant MMP cleavage assay, heparin-binding analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified enzymes and inhibitors, two processing steps characterized\",\n      \"pmids\": [\"10944521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ADAMTS-1 is a transcriptional target of the progesterone receptor (PR) in granulosa cells of preovulatory follicles following the LH surge; PR knockout mice fail to induce ADAMTS-1 mRNA, and ADAMTS-1-null mice show growth retardation, impaired female fertility, renal calyceal enlargement with fibrosis, and abnormal adrenal medullary architecture, establishing essential roles in growth, organ morphology, and ovulation.\",\n      \"method\": \"PR knockout mouse model, gene targeting (ADAMTS-1 null mice), histology, Northern blot\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple KO mouse models with defined phenotypic readouts replicated across labs\",\n      \"pmids\": [\"10811842\", \"10781075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ADAMTS1 cleaves aggrecan at multiple sites including a previously identified site (E373-A) and additional new sites, classifying it as an aggrecanase. A point mutation in the zinc-binding domain abolishes catalytic activity. Latency is conferred by the prodomain (furin cleavage site mutant retains latency). Activity is inhibited by TIMP-2, TIMP-3, and a specific monoclonal antibody.\",\n      \"method\": \"In vitro protease assay on purified aggrecan, zinc-binding domain point mutagenesis, furin cleavage site mutagenesis, TIMP inhibition assay, peptide substrate activity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with active-site mutagenesis confirming catalytic mechanism\",\n      \"pmids\": [\"12054629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Pro-ADAMTS-1 (110 kDa) is produced in mural granulosa cells and localized to cytoplasmic secretory vesicles; the mature 85-kDa form (prodomain-truncated) accumulates in the ECM of the cumulus-oocyte complex during matrix expansion. ADAMTS-1 cleaves versican in the COC matrix generating an N-terminal DPEAAE neoepitope fragment, and this cleavage is reduced in PRKO mouse ovaries deficient in ADAMTS-1.\",\n      \"method\": \"Immunofluorescence localization, Western blot of ovarian tissue, anti-neoepitope antibody detection of versican cleavage in PRKO vs. wild-type ovaries\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization combined with substrate cleavage verified in vivo with KO model\",\n      \"pmids\": [\"12907688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ADAMTS1 directly binds VEGF165 (but not VEGF121, which lacks the heparin-binding domain) via its carboxyl-terminal region, sequestering it and blocking VEGFR2 phosphorylation and endothelial cell proliferation. Inhibition is reversible; active VEGF can be recovered from the complex. ADAMTS1 and VEGF165 co-immunoprecipitate from tumor extracts.\",\n      \"method\": \"Co-immunoprecipitation, chemical cross-linking, domain deletion analysis, VEGFR2 phosphorylation assay, endothelial proliferation assay, tumor extract co-IP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal binding assays combined with functional readout (VEGFR2 phosphorylation, proliferation) and structure-function analysis\",\n      \"pmids\": [\"12716911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Adamts-1 null female mice are subfertile due to failure of mature oocytes to be released from ovarian follicles (ovulatory failure), while uterine function and embryo implantation are normal, establishing that ADAMTS-1 is specifically required for the tissue remodeling process of ovulation.\",\n      \"method\": \"Adamts-1 knockout mouse model, histology, fertility assay\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independent KO mouse generation with defined cellular phenotype, replicating prior findings\",\n      \"pmids\": [\"14668204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Furin is the principal convertase cleaving proADAMTS-1 at Arg235 (RKKR235) in the Golgi apparatus prior to secretion. The prodomain also contains conserved cysteine residues (C106, C125, C181) and other residues (Y108, G110, 137-144 sequence) required for proper biosynthesis. PACE4 and PC6B can also process proADAMTS-1 but less efficiently than furin.\",\n      \"method\": \"Site-directed mutagenesis of furin recognition sequences and conserved prodomain residues, biosynthetic labeling in HEK293 cells, Brefeldin A/monensin Golgi disruption\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis combined with biochemical processing assays\",\n      \"pmids\": [\"15184385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ADAMTS-1 gene transcription in granulosa cells is coordinately regulated by LH (via cAMP/PKA/Sp1/Sp3 and nuclear factor 1-like binding sites) and progesterone receptor (PRA/PRB acting as inducible coregulators via C/EBPβ and Sp1/Sp3 binding sites in the ADAMTS-1 promoter), despite absence of a consensus PR response element.\",\n      \"method\": \"Promoter-luciferase reporter assays with truncation and site-specific mutations, transfection of PRA/PRB expression vectors in granulosa cells, PR antagonist ZK98299 treatment\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple promoter mutants with defined transcription factor binding, validated in primary cell culture\",\n      \"pmids\": [\"15256533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ADAMTS-1 cleaves versican at multiple sites in cultured human aortic VSMCs and promotes VSMC migration, suggesting a role in atherogenesis through ECM remodeling. Transgenic overexpression in apoE-deficient mice increases intimal hyperplasia in the carotid artery flow cessation model.\",\n      \"method\": \"In vitro versican cleavage assay with peptide substrates, carotid artery flow cessation model in transgenic mice, VSMC migration assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic model plus in vitro substrate cleavage, single lab\",\n      \"pmids\": [\"15539621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ADAMTS1 uses its proteolytic activity to promote pulmonary metastasis via shedding of transmembrane precursors of heparin-binding EGF (HB-EGF) and amphiregulin (AR), activating EGFR and ErbB-2. A catalytically dead mutant (ADAMTS-1E/Q) inhibits metastasis. Auto-proteolytic cleavage of ADAMTS1 generates N- and C-terminal fragments containing TSP motifs that inhibit metastasis and suppress ERK1/2 activation by HB-EGF/AR.\",\n      \"method\": \"Overexpression of full-length, catalytically dead mutant, and autocleavage fragments; in vivo pulmonary metastasis assays; EGFR/ErbB-2 phosphorylation assays; ERK1/2 activation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple constructs with defined mechanisms tested in vivo and in vitro, orthogonal readouts\",\n      \"pmids\": [\"16314835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ADAMTS1 interacts with and cleaves tissue factor pathway inhibitor-2 (TFPI-2), removing a protease-sensitive C-terminal region and altering TFPI-2's binding properties and extracellular localization, identified by yeast two-hybrid screen and confirmed by multiple biochemical assays.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, cell-based assays, in vitro cleavage assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — substrate identified by unbiased screen and validated by multiple independent assays including direct cleavage\",\n      \"pmids\": [\"16641089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ADAMTS1 is required for structural maintenance of ovarian follicular basement membranes during folliculogenesis and for ovarian lymphangiogenesis; ADAMTS-1-null ovaries show follicle dysmorphogenesis with ECM disruption and severely delayed lymphatic development beginning at antrum formation.\",\n      \"method\": \"ADAMTS-1 null mouse histology, immunostaining of basement membrane components and cell-type markers (Cyp-17, AMH), lymphatic vessel immunostaining\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function mouse model with defined molecular markers and cellular phenotypes\",\n      \"pmids\": [\"17097630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Proteomic (DIGE) screening identified nidogen-1, nidogen-2, desmocollin-3, dystroglycan 1, and Mac-2-binding protein as putative ADAMTS1 substrates; nidogen-1 and nidogen-2 were validated as substrates by immunochemical analysis.\",\n      \"method\": \"DIGE proteomics of conditioned medium from ADAMTS1-overexpressing cells, mass spectrometry, immunochemical validation\",\n      \"journal\": \"Proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — unbiased proteomic identification with partial immunochemical validation, single lab\",\n      \"pmids\": [\"16511810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structures of human ADAMTS-1 reveal a conserved zinc metalloprotease catalytic domain with a larger S1' selectivity pocket than ADAM33 and an unexpected double calcium-binding site. The 'disintegrin-like' domain is structurally homologous to cysteine-rich domains of other metalloproteinases (not classical disintegrin domains), and it stacks against the active site suggesting a possible regulatory role. Structures obtained in apo form and in complex with inhibitor marimastat.\",\n      \"method\": \"X-ray crystallography (crystal structures of catalytic and disintegrin-like domains, with and without marimastat)\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures with inhibitor complex, multiple crystal forms\",\n      \"pmids\": [\"17897672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Endocardial Brg1 (chromatin remodeling protein) represses ADAMTS1 expression in the endocardium overlying developing trabeculae; repression of ADAMTS1 allows establishment of an ECM environment (cardiac jelly) that supports trabecular growth. Loss of Brg1 leads to ADAMTS1 upregulation, cardiac jelly degradation, and impaired trabeculation.\",\n      \"method\": \"Conditional Brg1 knockout mouse (endocardium-specific), genetic epistasis between Brg1 and ADAMTS1, rescue by ADAMTS1 deletion, histology and molecular analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with conditional KO, mechanistic link between chromatin regulator and substrate protease\",\n      \"pmids\": [\"18267097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ADAMTS1 cleaves the ectodomain of syndecan-4, a membrane-bound heparan sulfate proteoglycan, resulting in altered cytoskeletal organization, loss of focal adhesions, and increased cell migration. ADAMTS1 proteolytic action on syndecan-4 mimics the phenotype of genetic syndecan-4 deletion.\",\n      \"method\": \"In vitro cleavage assay, cytoskeleton immunostaining, focal adhesion analysis, migration assay in syndecan-4 null cells\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct cleavage demonstrated, functional equivalence confirmed with KO cells\",\n      \"pmids\": [\"18775505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ADAMTS1 and MMP1 orchestrate a paracrine signaling cascade in bone metastasis: ADAMTS1 proteolytically releases membrane-bound EGF-like ligands (amphiregulin, HB-EGF, TGFα) from tumor cells, which suppress osteoprotegerin (OPG) in osteoblasts and potentiate osteoclast differentiation, promoting osteolytic bone metastasis.\",\n      \"method\": \"In vitro shedding assays, EGFR signaling assays in osteoblasts, osteoclastogenesis assays, EGFR inhibitor treatment, bone metastasis mouse model\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo assays establishing pathway mechanism with pharmacological intervention\",\n      \"pmids\": [\"19608765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ADAMTS1 cleaves semaphorin 3C, releasing it from the extracellular matrix, and this cleavage promotes migration of breast cancer cells. Identified by two independent proteomic approaches (DIGE and SILAC).\",\n      \"method\": \"DIGE proteomics, SILAC, substrate validation assays, cell migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two independent proteomic approaches identifying same substrate, with functional migration readout\",\n      \"pmids\": [\"19915008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ADAMTS1 is a hypoxia-inducible gene specifically in endothelial cells (not other cell types); HIF-1 binds to HIF binding sites in the ADAMTS1 promoter under hypoxia (confirmed by ChIP). Hypoxia-induced expression is mediated via the PI3K pathway. Recombinant ADAMTS1 promotes endothelial cell migration under hypoxic conditions.\",\n      \"method\": \"RT-PCR and Western blot in multiple cell types, CoCl2 hypoxia mimetic, PI3K inhibitor (LY294002), secreted luciferase reporter assay, chromatin immunoprecipitation (ChIP) for HIF-1, endothelial migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirms HIF-1 binding, multiple supporting methods, functional recombinant protein assay\",\n      \"pmids\": [\"19349275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Pericyte-derived TIMP3 stabilizes and ADAMTS1 destabilizes capillary tubular networks in 3D gel assays. Kidney pericytes rapidly activate ADAMTS1 and downregulate TIMP3 after injury, promoting detachment and differentiation into myofibroblasts. TIMP3-null mice show spontaneous microvascular phenotype and exaggerated injury response.\",\n      \"method\": \"3D capillary tube formation/stabilization assay with pericytes, TIMP3-null mouse kidney phenotyping, gene expression analysis\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay in 3D system combined with KO mouse phenotyping, showing opposing roles of ADAMTS1 and TIMP3\",\n      \"pmids\": [\"22383695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ADAMTS1 acts as a tumor suppressor in breast carcinoma by cleaving nidogen-1 and nidogen-2 from vascular basement membranes, causing vessel morphological alterations and decreased vessel density. Increased ADAMTS1 expression leads to complete inhibition of tumor xenograft growth.\",\n      \"method\": \"Tumor xenograft model, immunofluorescence of vascular structures, nidogen cleavage assay, tumor vessel density analysis\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo xenograft with substrate (nidogen) cleavage linked to functional outcome, single lab\",\n      \"pmids\": [\"23681936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPARC treatment of cardiac fibroblasts increases secretion of both collagen I and ADAMTS1 (both 110-kDa latent and 87-kDa active forms) and activates TGF-β1-Smad2 signaling. An ADAMTS1-blocking antibody suppresses SPARC-induced collagen I secretion, establishing that SPARC promotes cardiac collagen deposition through ADAMTS1.\",\n      \"method\": \"Cardiac fibroblast stimulation with recombinant SPARC, ADAMTS1-blocking antibody, Western blot of conditioned media, picrosirius red collagen staining in aged WT and SPARC-null mice\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — blocking antibody establishes ADAMTS1 as downstream effector of SPARC, corroborated by in vivo SPARC-null mouse data\",\n      \"pmids\": [\"27143554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Macrophage-released ADAMTS1 promotes satellite cell (muscle stem cell) activation after muscle injury by targeting NOTCH1 as a metalloproteinase substrate, reducing Notch signaling and thereby increasing satellite cell activation. Overexpression of ADAMTS1 in macrophages in vivo is sufficient to increase satellite cell activation and improve muscle regeneration.\",\n      \"method\": \"In vivo macrophage-specific ADAMTS1 overexpression, satellite cell activation quantification, Notch signaling assays, identification of Notch1 as ADAMTS1 substrate\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gain-of-function, substrate identification (Notch1), defined downstream signaling pathway, multiple methods\",\n      \"pmids\": [\"28939843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Genetic haploinsufficiency of Adamts1 in mice causes thoracic aortic aneurysms and dissections (TAAD) similar to Marfan syndrome, mediated by elevated NOS2 and nitric oxide levels. Pharmacological or genetic inhibition of NOS2 protects Adamts1-haploinsufficient mice and MFS mice from aortic pathology and rapidly reverses aortic dilation.\",\n      \"method\": \"Adamts1 haploinsufficient and Nos2 knockout mouse models, aortic pathology quantification, pharmacological NOS2 inhibition, measurement of nitric oxide/NOS2 levels\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (double mutants) and pharmacological rescue establish ADAMTS1-NOS2 axis, strong in vivo evidence\",\n      \"pmids\": [\"28067899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Adamts1 (targeted by miR-181d) impairs adipocyte lineage commitment through its metalloprotease activity by remodeling ECM components and activating FAK-ERK signaling. Adipose tissue-specific ablation of Adamts1 increases adipose mass, reduces insulin sensitivity, and disrupts lipid homeostasis.\",\n      \"method\": \"Forced expression and siRNA knockdown of Adamts1, catalytically inactive mutant, adipogenesis assay, FAK-ERK signaling measurements, adipose-specific conditional KO mouse\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — catalytic mutant controls establish mechanism, pathway defined by signaling assays, in vivo KO phenotype\",\n      \"pmids\": [\"27447109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ADAMTS1 and syndecan-4 functionally interact in regulating endothelial cell adhesion, migration, and angiogenesis. ADAMTS1 knockdown reduces cell surface syndecan-4 via increased MMP9 activity. Both knockdowns enhance VEGFA164 responses and aortic ring sprouting. The altered adhesive phenotype is matrix-dependent and correlates with loss of fibulin-1 (an extracellular co-factor for ADAMTS1 known to inhibit migration) from the conditioned matrix.\",\n      \"method\": \"siRNA knockdown of ADAMTS1 and syndecan-4, MMP9 activity assay, VEGF signaling assays, aortic ring sprouting assay, cell migration assay on fibronectin, cell-conditioned matrix plating experiments\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple knockdown experiments with defined molecular readouts (MMP9, fibulin-1), functional convergence shown, single lab\",\n      \"pmids\": [\"32269093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Label-free quantitative proteomics identified 21 novel ADAMTS1 cleavage sites in versican V1 beyond the canonical Glu441-Ala442 site, using LC-MS/MS of digests with active versus catalytically inactive ADAMTS1. ADAMTS1/4/5 share a preference for P1-Glu residues in proteoglycan substrates.\",\n      \"method\": \"In vitro recombinant versican digestion with active and catalytically inactive ADAMTS1, label-free LC-MS/MS, z-score statistical approach for cleavage site ranking\",\n      \"journal\": \"Journal of proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with inactive enzyme controls, quantitative proteomics rigorously applied\",\n      \"pmids\": [\"34450332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ADAMTS1 inhibits lymphangiogenesis by binding VEGFC and attenuating VEGFR3 phosphorylation in lymphatic endothelial cells (HMVEC-dLy), reducing proliferation and tube formation. ADAMTS1-VEGFC complex formation confirmed by immunoprecipitation.\",\n      \"method\": \"Adenoviral ADAMTS1 gene transduction in HMVEC-dLy, proliferation and tube formation assays, VEGFR3 phosphorylation assay, immunoprecipitation of ADAMTS1-VEGFC complex\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding (Co-IP) and functional inhibition of VEGFR3 signaling, single lab\",\n      \"pmids\": [\"24631293\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADAMTS1 is a secreted, furin-processed zinc metalloprotease that anchors to the ECM via its C-terminal TSP motifs and spacer region, where it cleaves proteoglycan substrates (aggrecan, versican at multiple Glu-X sites), basement membrane components (nidogen-1/2), and signaling molecules (syndecan-4, semaphorin 3C, NOTCH1, EGF-like ligands); it sequesters VEGF165 and VEGFC through its C-terminal domain to inhibit angiogenesis and lymphangiogenesis via VEGFR2/VEGFR3 blockade, is transcriptionally regulated by LH/progesterone receptor/HIF-1/Brg1 in a context-dependent manner, and its haploinsufficiency causes thoracic aortic disease through an ADAMTS1-NOS2 axis while its metalloprotease activity drives diverse processes including ovulation, satellite cell activation via Notch cleavage, and ECM-dependent regulation of adipogenesis and cardiac fibrosis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ADAMTS1 is a secreted zinc metalloprotease that functions as a major extracellular matrix remodeling enzyme regulating angiogenesis, tissue morphogenesis, and proteoglycan turnover. Secreted as a latent proenzyme, it undergoes furin-mediated prodomain cleavage in the Golgi to yield the active p87 form, which anchors to the ECM via C-terminal thrombospondin type I motifs and a spacer region through heparan sulfate interactions; secondary cleavage by MMPs generates a p65 form with reduced anti-angiogenic capacity [PMID:9593739, PMID:10944521, PMID:15184385]. Its catalytic activity cleaves proteoglycans (aggrecan at Glu-X sites, versican at >20 sites), basement membrane nidogens, syndecan-4, semaphorin 3C, NOTCH1, and EGF-like ligand precursors (HB-EGF, amphiregulin), thereby controlling processes from ovulation and cardiac trabeculation to satellite cell activation and bone metastasis [PMID:12054629, PMID:34450332, PMID:18775505, PMID:28939843, PMID:18267097, PMID:19608765]. Independent of catalysis, its C-terminal domain sequesters VEGF165 and VEGFC to block VEGFR2/VEGFR3 signaling and inhibit angiogenesis and lymphangiogenesis, and haploinsufficiency in mice causes thoracic aortic aneurysm through a NOS2-dependent mechanism [PMID:12716911, PMID:24631293, PMID:28067899].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing how ADAMTS1 is retained in the extracellular space resolved a basic question about its localization: the C-terminal TSP motifs and spacer region mediate ECM anchoring through sulfated glycosaminoglycan interactions.\",\n      \"evidence\": \"Deletion mutant analysis and heparin displacement in COS-7 cells\",\n      \"pmids\": [\"9593739\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific GAG-binding residues not mapped\", \"In vivo ECM anchoring not demonstrated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating that recombinant ADAMTS1 suppresses FGF-2- and VEGF-induced angiogenesis with endothelial specificity established it as an anti-angiogenic factor, raising the question of mechanism.\",\n      \"evidence\": \"Cornea pocket assay, chorioallantoic membrane assay, endothelial proliferation assay with purified protein\",\n      \"pmids\": [\"10438512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of endothelial specificity unknown\", \"Whether catalytic activity was required not tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of two sequential processing steps — furin cleavage of the prodomain and MMP-mediated removal of C-terminal TSP repeats — explained how ADAMTS1 transitions from latent to active forms and how its anti-angiogenic potency is modulated post-secretion.\",\n      \"evidence\": \"In vitro reconstitution with purified furin and MMPs, furin and MMP inhibitors\",\n      \"pmids\": [\"10944521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context of MMP cleavage not established\", \"Processing kinetics in vivo unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Knockout mouse phenotyping revealed essential in vivo roles in female fertility (ovulatory failure), growth, and organ morphogenesis, and identified progesterone receptor as a transcriptional regulator in granulosa cells.\",\n      \"evidence\": \"ADAMTS-1-null and PR-null mouse models, Northern blot, histology, fertility assays\",\n      \"pmids\": [\"10811842\", \"10781075\", \"14668204\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ovulatory substrates not yet identified\", \"Mechanism of renal and adrenal phenotypes unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"In vitro reconstitution with active-site mutants classified ADAMTS1 as a bona fide aggrecanase and showed its catalytic activity is zinc-dependent, latency is prodomain-conferred, and it is inhibited by TIMP-2 and TIMP-3.\",\n      \"evidence\": \"Purified aggrecan cleavage, zinc-binding domain point mutagenesis, TIMP inhibition assay\",\n      \"pmids\": [\"12054629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution versus ADAMTS4/5 in cartilage not resolved\", \"No in vivo aggrecanase role demonstrated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Two advances addressed the anti-angiogenic mechanism and the ovulatory substrate: ADAMTS1 sequesters VEGF165 via its C-terminal domain blocking VEGFR2 phosphorylation, and it cleaves versican in the cumulus-oocyte complex, linking its protease activity to ovulation.\",\n      \"evidence\": \"Co-IP, cross-linking, VEGFR2 phosphorylation assay; anti-neoepitope versican detection in PRKO ovaries\",\n      \"pmids\": [\"12716911\", \"12907688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether VEGF sequestration and protease activity are independent anti-angiogenic mechanisms not resolved\", \"Full set of ovulatory substrates unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Detailed mapping of furin cleavage at Arg235 in the Golgi and identification of conserved prodomain residues essential for biosynthesis refined the activation mechanism, while promoter dissection revealed LH/cAMP and PR act as cooperative transcriptional regulators through non-canonical binding sites.\",\n      \"evidence\": \"Site-directed mutagenesis with Brefeldin A/monensin in HEK293; promoter-reporter assays in primary granulosa cells\",\n      \"pmids\": [\"15184385\", \"15256533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Prodomain chaperone function not structurally explained\", \"Whether PR acts as direct DNA-binder or coregulator not definitively resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Expanding the substrate repertoire to nidogens, syndecan-4 ectodomain, EGF-like ligands, and TFPI-2 revealed ADAMTS1 as a broad ECM and cell-surface sheddase, while in vivo studies showed its catalytic activity promotes metastasis through EGFR/ErbB2 activation and is required for ovarian basement membrane integrity and lymphangiogenesis.\",\n      \"evidence\": \"DIGE proteomics, Y2H screen, catalytically dead mutant in metastasis model, ADAMTS1-null ovarian histology\",\n      \"pmids\": [\"16314835\", \"16511810\", \"16641089\", \"17097630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative importance of individual substrates in each tissue context unclear\", \"Anti- vs pro-metastatic roles appear context-dependent and unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Crystal structures of the catalytic and disintegrin-like domains revealed a distinctive large S1' pocket, double calcium-binding site, and stacking of the disintegrin-like domain against the active site, providing the first structural framework for understanding substrate selectivity.\",\n      \"evidence\": \"X-ray crystallography with and without marimastat inhibitor\",\n      \"pmids\": [\"17897672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of TSP/spacer domains\", \"Structural basis of substrate discrimination versus ADAMTS4/5 not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetic epistasis in mice established that endocardial Brg1 represses ADAMTS1 to preserve cardiac jelly for trabeculation, demonstrating a chromatin-level control mechanism for ADAMTS1 in cardiac development.\",\n      \"evidence\": \"Endocardium-specific Brg1 knockout rescued by ADAMTS1 deletion\",\n      \"pmids\": [\"18267097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Brg1-ADAMTS1 promoter interaction not shown\", \"Cardiac jelly substrates of ADAMTS1 not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of HIF-1 as a direct transcriptional activator (by ChIP) in hypoxic endothelium added a third transcriptional axis, while paracrine EGF-like ligand shedding was shown to drive osteolytic bone metastasis by suppressing osteoblast OPG.\",\n      \"evidence\": \"ChIP for HIF-1, PI3K inhibitor, endothelial migration assay; bone metastasis model with EGFR inhibitor\",\n      \"pmids\": [\"19349275\", \"19608765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of HIF-1, PR, and Brg1 transcriptional programs in same tissue not studied\", \"Whether shedding activity is substrate-selective in bone unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extending the VEGF sequestration model to VEGFC/VEGFR3 in lymphatic endothelial cells explained the lymphangiogenic defect observed in null mice and broadened the anti-angiogenic mechanism to lymphatic vessels.\",\n      \"evidence\": \"Co-IP of ADAMTS1-VEGFC complex, VEGFR3 phosphorylation and tube formation assays in HMVEC-dLy\",\n      \"pmids\": [\"24631293\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain requirements for VEGFC binding not mapped\", \"In vivo VEGFC sequestration not directly demonstrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"ADAMTS1's metalloprotease activity was shown to regulate adipogenesis through ECM remodeling and FAK-ERK signaling, with adipose-specific knockout increasing fat mass, establishing a metabolic role beyond vascular and reproductive biology.\",\n      \"evidence\": \"Catalytically inactive mutant, adipogenesis assay, adipose-specific conditional KO mouse\",\n      \"pmids\": [\"27447109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ECM substrates mediating adipogenesis suppression not identified\", \"Whether FAK-ERK activation is direct or secondary to ECM changes unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Two landmark studies revealed that ADAMTS1 haploinsufficiency causes thoracic aortic aneurysm through NOS2 upregulation (rescuable by NOS2 inhibition), and that macrophage-released ADAMTS1 activates satellite cells by cleaving NOTCH1, connecting the protease to both vascular disease and muscle regeneration.\",\n      \"evidence\": \"Adamts1 haploinsufficient × Nos2 KO genetic epistasis with pharmacological rescue; macrophage-specific overexpression with Notch signaling assays\",\n      \"pmids\": [\"28067899\", \"28939843\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ADAMTS1 haploinsufficiency leads to NOS2 upregulation mechanistically unresolved\", \"Whether NOTCH1 is cleaved at a specific site by ADAMTS1 not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Quantitative proteomics identified >20 novel cleavage sites in versican V1 and established a shared P1-Glu preference among ADAMTS1/4/5, providing a comprehensive cleavage map for the primary proteoglycan substrate.\",\n      \"evidence\": \"Label-free LC-MS/MS comparing active versus catalytically inactive ADAMTS1 digests of recombinant versican\",\n      \"pmids\": [\"34450332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of individual cleavage sites not determined\", \"Whether all sites are cleaved in vivo unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for substrate selectivity (no full-length structure exists), how the protease-dependent and VEGF-sequestration functions are coordinately regulated in vivo, the mechanism linking ADAMTS1 haploinsufficiency to NOS2 elevation in aortic disease, and whether ADAMTS1 has distinct or redundant roles relative to ADAMTS4/5 in specific tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length ADAMTS1 structure\", \"Catalytic versus non-catalytic functions not separable in vivo\", \"ADAMTS1 versus ADAMTS4/5 redundancy not systematically tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 5, 11, 12, 17, 18, 19, 24, 26, 28]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [4, 15, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 2, 6]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 5, 10, 14, 17, 28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 11, 18, 24, 26, 29]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 7, 16]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"VEGFA\",\n      \"VEGFC\",\n      \"VCAN\",\n      \"ACAN\",\n      \"NID1\",\n      \"SDC4\",\n      \"NOTCH1\",\n      \"TFPI2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}