{"gene":"ANGPTL2","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2014,"finding":"ANGPTL2 activates proinflammatory NF-κB signaling in endothelial cells and increases monocyte/macrophage chemotaxis; endothelial cell-derived ANGPTL2 accelerates vascular inflammation leading to endothelial dysfunction and atherosclerosis progression, demonstrated by Angptl2 knockout in ApoE-deficient mice attenuating plaque formation and bone marrow transplantation experiments identifying endothelial cells as the critical source.","method":"Knockout mouse model (ApoE-/- × Angptl2-/-), transgenic overexpression (Tie2-Angptl2 Tg), bone marrow transplantation, in vitro NF-κB signaling assay, monocyte chemotaxis assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vivo and in vitro methods, reciprocal gain/loss-of-function, replicated mechanistic readouts","pmids":["24526691"],"is_preprint":false},{"year":2012,"finding":"Tumor cell-derived ANGPTL2 promotes tumor cell motility and invasion in an autocrine/paracrine manner; ANGPTL2 expression in primary tumor cells accelerates metastasis in xenograft models, and transcription factors NFATc, ATF2, and c-Jun upregulate ANGPTL2 expression in aggressive tumor cells.","method":"In vitro migration/invasion assays, xenograft mouse models, RNAi knockdown of ANGPTL2, transcription factor overexpression","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (in vitro + in vivo xenograft, gain/loss-of-function), strong mechanistic evidence","pmids":["22345152"],"is_preprint":false},{"year":2014,"finding":"ANGPTL2 promotes osteosarcoma metastasis through integrin α5β1, p38 MAPK signaling, and matrix metalloproteinases; the TLL1 (tolloid-like 1) protease cleaves ANGPTL2 into fragments that do not enhance tumor progression, and ANGPTL2 expression increases via DNA demethylation under hypoxic/serum-starved conditions.","method":"Xenograft mouse models, integrin signaling assays, MMP activity assays, in vitro protease cleavage assay, methylation analysis","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of protease cleavage, multiple signaling pathway analyses, in vivo validation","pmids":["24448647"],"is_preprint":false},{"year":2014,"finding":"Angptl2 expressed in mammalian cells forms high-molecular-weight (multimeric) species, and ligand multimerization is required for activation of the immune inhibitory receptor LILRB2 for downstream signaling; a novel motif in the first and fourth Ig domains of LILRB2 is necessary for binding and activation by Angptl2.","method":"Co-immunoprecipitation, binding assays, LILRB2 domain mutagenesis, downstream signaling assays, hematopoietic stem cell expansion assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis combined with functional signaling assays and binding studies in a single study","pmids":["24899623"],"is_preprint":false},{"year":2016,"finding":"ANGPTL2 overexpression in the heart causes cardiac dysfunction by inactivating AKT and SERCA2a signaling and decreasing myocardial energy metabolism; Angptl2 knockout mice show increased left ventricular contractility and upregulated AKT-SERCA2a signaling; ANGPTL2-knockdown in pressure-overloaded mice ameliorates cardiac dysfunction.","method":"Cardiac-specific transgenic overexpression, Angptl2 knockout mice, pressure overload model (transverse aortic constriction), AKT/SERCA2a signaling assays, metabolic measurements","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function in vivo with defined molecular pathway (AKT-SERCA2a) and multiple physiological readouts","pmids":["27677409"],"is_preprint":false},{"year":2013,"finding":"Perivascular adipose tissue-secreted Angptl2 accelerates neointimal hyperplasia and vascular inflammation after endovascular injury; demonstrated by adipose tissue transplantation experiments showing that Angptl2-overexpressing perivascular fat accelerates and Angptl2-knockout perivascular fat attenuates neointimal hyperplasia.","method":"Adipose tissue transplantation, transgenic (aP2-Angptl2) and knockout (Angptl2-/-) mice, wire-injury model, histology and RT-PCR","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function transplantation experiment with defined cellular source and in vivo phenotypic readout","pmids":["23333801"],"is_preprint":false},{"year":2021,"finding":"CD146 is identified as a novel receptor for ANGPTL2 on adipocytes; ANGPTL2 binds CD146 to activate CREB, which upregulates CD146 expression; CD146 ablation suppresses adipogenesis in preadipocytes and lipid accumulation in mature adipocytes, and anti-CD146 antibodies inhibit obesity by disrupting ANGPTL2-CD146 interactions.","method":"Co-immunoprecipitation/binding assays, CD146 knockout, CREB signaling assays, adipogenesis assays, anti-CD146 antibody treatment in vivo","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 2 — receptor identification with binding assay, downstream signaling validated, loss-of-function with defined cellular phenotypes","pmids":["33747748"],"is_preprint":false},{"year":2019,"finding":"ANGPTL2 promotes renal fibrosis in diabetic nephropathy through the MEK/ERK/Nrf-1 pathway; ANGPTL2 knockdown in high-glucose-stimulated HK-2 cells causes increases in MEK, p-ERK, Nrf-1, autophagy markers (LC3II, beclin1), and decreases in fibrotic markers (fibronectin, collagen I/IV) and pro-inflammatory cytokines.","method":"ANGPTL2 knockdown (siRNA) in HK-2 cells, streptozotocin-induced diabetic rat model, Western blot for MEK/ERK/Nrf-1 pathway, ELISA for inflammatory cytokines, pathway inhibitor rescue experiments","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 2-3 — defined pathway with pharmacological rescue, single lab with in vitro and in vivo concordance","pmids":["31632523"],"is_preprint":false},{"year":2021,"finding":"miR-378a-3p from tumor-derived extracellular vesicles is taken up by bone marrow macrophages where it inhibits Dyrk1a, enabling Nfatc1 nuclear translocation and upregulating Angptl2 expression; increased Angptl2 secretion from macrophages then promotes prostate cancer progression in a feedback loop.","method":"In vitro and in vivo functional assays, EV uptake experiments, Dyrk1a inhibition, Nfatc1 nuclear translocation assays, Angptl2 expression measurement","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2-3 — mechanistic pathway established in single study with in vitro and in vivo validation, but single lab","pmids":["34801597"],"is_preprint":false},{"year":2014,"finding":"Diverse roles review: ANGPTL2 maintains tissue homeostasis by promoting adaptive inflammation and subsequent tissue reconstruction; excess ANGPTL2 signaling induced by prolonged stress promotes chronic inflammation and irreversible tissue remodeling leading to metabolic diseases.","method":"Review synthesizing data from multiple mouse genetic models (transgenic, knockout) across multiple tissues","journal":"Trends in endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — review but synthesizes multiple independent in vivo model studies; no new experimental data","pmids":["24746520"],"is_preprint":false},{"year":2015,"finding":"ANGPTL2 activates PI3K/AKT but not p38MAPK-dependent cell growth and survival in osteosarcoma cells; treatment with IAP antagonist GDC-0152 suppresses ANGPTL2-induced PI3K/AKT activation and reduces cell growth and apoptosis resistance, but does not block ANGPTL2-induced p38MAPK, MMP-9/MMP-2 expression, or migration.","method":"MTT cell viability assay, migration chamber assay, Western blot for PI3K/AKT/p38MAPK, qRT-PCR and gelatin zymography for MMPs, recombinant human ANGPTL2 treatment","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, pharmacological dissection of signaling pathways with defined readouts","pmids":["25651778"],"is_preprint":false}],"current_model":"ANGPTL2 is a secreted glycoprotein that signals through at least two receptors—LILRB2 (on hematopoietic stem cells and immune cells) and CD146 (on adipocytes)—in a multimerization-dependent manner to activate downstream pathways including NF-κB (in endothelial cells), integrin α5β1/p38 MAPK/MMP (in tumor cells), AKT-SERCA2a (in cardiomyocytes), and MEK/ERK (in renal cells), thereby acting as a paracrine/autocrine driver of vascular inflammation, tumor metastasis, cardiac dysfunction, and adipose tissue remodeling; its activity is modulated by proteolytic cleavage by TLL1 and by transcriptional regulators including NFATc, ATF2, and c-Jun."},"narrative":{"teleology":[{"year":2012,"claim":"Establishing that ANGPTL2 is not merely a circulating factor but an autocrine/paracrine driver of tumor cell invasion, answering whether tumor cells themselves use ANGPTL2 to promote metastasis and identifying NFATc/ATF2/c-Jun as transcriptional activators of ANGPTL2 in aggressive tumors.","evidence":"RNAi knockdown and overexpression in tumor cells with in vitro invasion assays and xenograft mouse models","pmids":["22345152"],"confidence":"High","gaps":["Receptor on tumor cells mediating autocrine signaling not identified","Relative contribution of each transcription factor (NFATc, ATF2, c-Jun) to ANGPTL2 expression not dissected"]},{"year":2013,"claim":"Demonstrating that the tissue source of ANGPTL2 matters: perivascular adipose tissue is a functionally relevant secretory source that accelerates vascular injury responses, establishing ANGPTL2 as a paracrine adipokine in vascular inflammation.","evidence":"Reciprocal adipose tissue transplantation from Angptl2-transgenic and knockout mice in wire-injury models","pmids":["23333801"],"confidence":"High","gaps":["Receptor on vascular smooth muscle cells or endothelium mediating perivascular ANGPTL2 action not identified","Downstream signaling pathway in neointimal cells not delineated"]},{"year":2014,"claim":"Resolving two critical questions simultaneously: (1) endothelial cell-derived ANGPTL2 drives atherosclerosis via NF-κB-dependent monocyte recruitment, and (2) in tumor cells ANGPTL2 signals through integrin α5β1/p38 MAPK/MMPs while TLL1 protease cleavage inactivates the protein—establishing that context-specific receptor–pathway coupling and proteolytic regulation control ANGPTL2 activity.","evidence":"ApoE−/−×Angptl2−/− knockout mice with bone marrow transplantation for vascular studies; in vitro protease cleavage reconstitution, integrin/MMP signaling assays, and xenograft models for tumor studies","pmids":["24526691","24448647"],"confidence":"High","gaps":["Identity of endothelial ANGPTL2 receptor for NF-κB activation unknown","Structural basis of TLL1 cleavage site not mapped at residue resolution"]},{"year":2014,"claim":"Identifying LILRB2 as a receptor for ANGPTL2 and demonstrating that ligand multimerization is essential for receptor activation, answering how ANGPTL2 engages immune-inhibitory receptor signaling on hematopoietic stem cells.","evidence":"Co-immunoprecipitation, LILRB2 Ig-domain mutagenesis, binding assays, and hematopoietic stem cell expansion functional readout","pmids":["24899623"],"confidence":"High","gaps":["Downstream signaling events linking LILRB2 activation to HSC expansion not fully mapped","Whether LILRB2 mediates ANGPTL2 effects in non-hematopoietic contexts unknown"]},{"year":2015,"claim":"Dissecting that ANGPTL2 activates two separable signaling arms in osteosarcoma—PI3K/AKT for cell survival versus p38 MAPK/MMP for migration—and showing these can be pharmacologically uncoupled.","evidence":"Recombinant ANGPTL2 treatment with GDC-0152 (IAP antagonist) in osteosarcoma cells; Western blot and zymography readouts","pmids":["25651778"],"confidence":"Medium","gaps":["Single cell line used; generalizability across tumor types not tested","Receptor upstream of PI3K/AKT arm not identified"]},{"year":2016,"claim":"Establishing ANGPTL2 as a cardiodepressant factor: cardiac overexpression inactivates AKT-SERCA2a signaling and impairs contractility, while knockout enhances cardiac function, answering whether ANGPTL2 directly regulates myocardial performance.","evidence":"Cardiac-specific transgenic overexpression, global Angptl2 knockout, and transverse aortic constriction model with AKT/SERCA2a signaling and metabolic readouts","pmids":["27677409"],"confidence":"High","gaps":["Cardiac receptor for ANGPTL2 not identified","Whether circulating versus local cardiac ANGPTL2 is the relevant pool in heart failure not resolved"]},{"year":2019,"claim":"Extending ANGPTL2's pro-fibrotic role to the kidney: ANGPTL2 promotes renal fibrosis through MEK/ERK/Nrf-1 signaling and suppresses protective autophagy, linking ANGPTL2 to diabetic nephropathy pathogenesis.","evidence":"siRNA knockdown in HK-2 cells under high glucose, streptozotocin-induced diabetic rat model, MEK inhibitor rescue","pmids":["31632523"],"confidence":"Medium","gaps":["Renal receptor for ANGPTL2 unknown","Whether Nrf-1 is a direct or indirect target of ERK in this context not resolved","Single-lab study without independent replication"]},{"year":2021,"claim":"Identifying CD146 as a second defined receptor for ANGPTL2, this time on adipocytes, and demonstrating a CREB-dependent feedforward loop that drives adipogenesis—providing the first receptor-level explanation for ANGPTL2's role in obesity.","evidence":"Co-immunoprecipitation/binding assays, CD146 knockout, anti-CD146 antibody treatment in vivo, adipogenesis assays","pmids":["33747748"],"confidence":"High","gaps":["Whether CD146 mediates ANGPTL2 signaling in non-adipocyte contexts (e.g. endothelium) not tested","Structural basis of ANGPTL2–CD146 interaction not determined"]},{"year":2021,"claim":"Revealing a tumor microenvironment feedback loop: tumor-derived extracellular vesicle miR-378a-3p activates NFATc1 in bone marrow macrophages, upregulating Angptl2 secretion that in turn promotes prostate cancer progression.","evidence":"EV uptake experiments, Dyrk1a inhibition, NFATc1 nuclear translocation assays, in vitro and in vivo tumor progression models","pmids":["34801597"],"confidence":"Medium","gaps":["Receptor on tumor cells through which macrophage-derived ANGPTL2 acts not identified","Whether this EV-mediated loop operates in other cancer types unknown","Single-lab finding"]},{"year":null,"claim":"The endothelial and cardiac receptors for ANGPTL2 remain unidentified; the structural determinants of multimerization-dependent receptor selectivity between LILRB2 and CD146 are unknown; and it is unclear how TLL1 cleavage is regulated in vivo to control ANGPTL2 bioactivity across tissues.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of ANGPTL2 multimer or receptor complexes","Endothelial and cardiac ANGPTL2 receptors not identified","In vivo regulation of TLL1 cleavage of ANGPTL2 not characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,3,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,7]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,2,5,6]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,3,4,6,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,3,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,2,7,8]}],"complexes":[],"partners":["LILRB2","CD146","TLL1","SERCA2A"],"other_free_text":[]},"mechanistic_narrative":"ANGPTL2 is a secreted, multimeric glycoprotein that functions as a paracrine and autocrine mediator of inflammation, tissue remodeling, and tumor metastasis across vascular, cardiac, adipose, and renal compartments. It signals through at least two identified receptors—LILRB2 on hematopoietic/immune cells, requiring ligand multimerization for activation [PMID:24899623], and CD146 on adipocytes, where it engages a CREB-dependent positive feedback loop to drive adipogenesis [PMID:33747748]—and activates distinct intracellular cascades including NF-κB in endothelial cells [PMID:24526691], integrin α5β1/p38 MAPK/MMP in tumor cells [PMID:24448647], AKT-SERCA2a in cardiomyocytes [PMID:27677409], and MEK/ERK in renal epithelial cells [PMID:31632523]. Its activity is negatively regulated by TLL1-mediated proteolytic cleavage, which generates inactive fragments [PMID:24448647], and its expression is upregulated by the transcription factors NFATc, ATF2, and c-Jun in aggressive tumor cells and by NFATc1 nuclear translocation in bone marrow macrophages [PMID:22345152, PMID:34801597]."},"prefetch_data":{"uniprot":{"accession":"Q9UKU9","full_name":"Angiopoietin-related protein 2","aliases":["Angiopoietin-like protein 2"],"length_aa":493,"mass_kda":57.1,"function":"Induces sprouting in endothelial cells through an autocrine and paracrine action","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q9UKU9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ANGPTL2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ANGPTL2","total_profiled":1310},"omim":[{"mim_id":"605001","title":"ANGIOPOIETIN-LIKE 2; ANGPTL2","url":"https://www.omim.org/entry/605001"},{"mim_id":"604815","title":"LEUKOCYTE IMMUNOGLOBULIN-LIKE RECEPTOR, SUBFAMILY B, MEMBER 2; LILRB2","url":"https://www.omim.org/entry/604815"},{"mim_id":"604774","title":"ANGIOPOIETIN-LIKE 3; ANGPTL3","url":"https://www.omim.org/entry/604774"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ANGPTL2"},"hgnc":{"alias_symbol":["ARP2","HARP"],"prev_symbol":[]},"alphafold":{"accession":"Q9UKU9","domains":[{"cath_id":"3.90.215.10","chopping":"277-486","consensus_level":"high","plddt":97.0287,"start":277,"end":486},{"cath_id":"1.20.5","chopping":"89-195","consensus_level":"medium","plddt":87.3838,"start":89,"end":195}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKU9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKU9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKU9-F1-predicted_aligned_error_v6.png","plddt_mean":78.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ANGPTL2","jax_strain_url":"https://www.jax.org/strain/search?query=ANGPTL2"},"sequence":{"accession":"Q9UKU9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UKU9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UKU9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKU9"}},"corpus_meta":[{"pmid":"15684033","id":"PMC_15684033","title":"Molecular mechanisms of invadopodium formation: the role of the N-WASP-Arp2/3 complex pathway and cofilin.","date":"2005","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15684033","citation_count":559,"is_preprint":false},{"pmid":"11231575","id":"PMC_11231575","title":"Activation of Arp2/3 complex-mediated actin polymerization by cortactin.","date":"2001","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11231575","citation_count":481,"is_preprint":false},{"pmid":"11721045","id":"PMC_11721045","title":"Crystal structure of Arp2/3 complex.","date":"2001","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/11721045","citation_count":413,"is_preprint":false},{"pmid":"23212475","id":"PMC_23212475","title":"New insights into the regulation and cellular functions of the ARP2/3 complex.","date":"2012","source":"Nature reviews. 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source.\",\n      \"method\": \"Knockout mouse model (ApoE-/- × Angptl2-/-), transgenic overexpression (Tie2-Angptl2 Tg), bone marrow transplantation, in vitro NF-κB signaling assay, monocyte chemotaxis assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and in vitro methods, reciprocal gain/loss-of-function, replicated mechanistic readouts\",\n      \"pmids\": [\"24526691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tumor cell-derived ANGPTL2 promotes tumor cell motility and invasion in an autocrine/paracrine manner; ANGPTL2 expression in primary tumor cells accelerates metastasis in xenograft models, and transcription factors NFATc, ATF2, and c-Jun upregulate ANGPTL2 expression in aggressive tumor cells.\",\n      \"method\": \"In vitro migration/invasion assays, xenograft mouse models, RNAi knockdown of ANGPTL2, transcription factor overexpression\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (in vitro + in vivo xenograft, gain/loss-of-function), strong mechanistic evidence\",\n      \"pmids\": [\"22345152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ANGPTL2 promotes osteosarcoma metastasis through integrin α5β1, p38 MAPK signaling, and matrix metalloproteinases; the TLL1 (tolloid-like 1) protease cleaves ANGPTL2 into fragments that do not enhance tumor progression, and ANGPTL2 expression increases via DNA demethylation under hypoxic/serum-starved conditions.\",\n      \"method\": \"Xenograft mouse models, integrin signaling assays, MMP activity assays, in vitro protease cleavage assay, methylation analysis\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of protease cleavage, multiple signaling pathway analyses, in vivo validation\",\n      \"pmids\": [\"24448647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Angptl2 expressed in mammalian cells forms high-molecular-weight (multimeric) species, and ligand multimerization is required for activation of the immune inhibitory receptor LILRB2 for downstream signaling; a novel motif in the first and fourth Ig domains of LILRB2 is necessary for binding and activation by Angptl2.\",\n      \"method\": \"Co-immunoprecipitation, binding assays, LILRB2 domain mutagenesis, downstream signaling assays, hematopoietic stem cell expansion assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis combined with functional signaling assays and binding studies in a single study\",\n      \"pmids\": [\"24899623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANGPTL2 overexpression in the heart causes cardiac dysfunction by inactivating AKT and SERCA2a signaling and decreasing myocardial energy metabolism; Angptl2 knockout mice show increased left ventricular contractility and upregulated AKT-SERCA2a signaling; ANGPTL2-knockdown in pressure-overloaded mice ameliorates cardiac dysfunction.\",\n      \"method\": \"Cardiac-specific transgenic overexpression, Angptl2 knockout mice, pressure overload model (transverse aortic constriction), AKT/SERCA2a signaling assays, metabolic measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function in vivo with defined molecular pathway (AKT-SERCA2a) and multiple physiological readouts\",\n      \"pmids\": [\"27677409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Perivascular adipose tissue-secreted Angptl2 accelerates neointimal hyperplasia and vascular inflammation after endovascular injury; demonstrated by adipose tissue transplantation experiments showing that Angptl2-overexpressing perivascular fat accelerates and Angptl2-knockout perivascular fat attenuates neointimal hyperplasia.\",\n      \"method\": \"Adipose tissue transplantation, transgenic (aP2-Angptl2) and knockout (Angptl2-/-) mice, wire-injury model, histology and RT-PCR\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function transplantation experiment with defined cellular source and in vivo phenotypic readout\",\n      \"pmids\": [\"23333801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CD146 is identified as a novel receptor for ANGPTL2 on adipocytes; ANGPTL2 binds CD146 to activate CREB, which upregulates CD146 expression; CD146 ablation suppresses adipogenesis in preadipocytes and lipid accumulation in mature adipocytes, and anti-CD146 antibodies inhibit obesity by disrupting ANGPTL2-CD146 interactions.\",\n      \"method\": \"Co-immunoprecipitation/binding assays, CD146 knockout, CREB signaling assays, adipogenesis assays, anti-CD146 antibody treatment in vivo\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor identification with binding assay, downstream signaling validated, loss-of-function with defined cellular phenotypes\",\n      \"pmids\": [\"33747748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ANGPTL2 promotes renal fibrosis in diabetic nephropathy through the MEK/ERK/Nrf-1 pathway; ANGPTL2 knockdown in high-glucose-stimulated HK-2 cells causes increases in MEK, p-ERK, Nrf-1, autophagy markers (LC3II, beclin1), and decreases in fibrotic markers (fibronectin, collagen I/IV) and pro-inflammatory cytokines.\",\n      \"method\": \"ANGPTL2 knockdown (siRNA) in HK-2 cells, streptozotocin-induced diabetic rat model, Western blot for MEK/ERK/Nrf-1 pathway, ELISA for inflammatory cytokines, pathway inhibitor rescue experiments\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — defined pathway with pharmacological rescue, single lab with in vitro and in vivo concordance\",\n      \"pmids\": [\"31632523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-378a-3p from tumor-derived extracellular vesicles is taken up by bone marrow macrophages where it inhibits Dyrk1a, enabling Nfatc1 nuclear translocation and upregulating Angptl2 expression; increased Angptl2 secretion from macrophages then promotes prostate cancer progression in a feedback loop.\",\n      \"method\": \"In vitro and in vivo functional assays, EV uptake experiments, Dyrk1a inhibition, Nfatc1 nuclear translocation assays, Angptl2 expression measurement\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — mechanistic pathway established in single study with in vitro and in vivo validation, but single lab\",\n      \"pmids\": [\"34801597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Diverse roles review: ANGPTL2 maintains tissue homeostasis by promoting adaptive inflammation and subsequent tissue reconstruction; excess ANGPTL2 signaling induced by prolonged stress promotes chronic inflammation and irreversible tissue remodeling leading to metabolic diseases.\",\n      \"method\": \"Review synthesizing data from multiple mouse genetic models (transgenic, knockout) across multiple tissues\",\n      \"journal\": \"Trends in endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — review but synthesizes multiple independent in vivo model studies; no new experimental data\",\n      \"pmids\": [\"24746520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ANGPTL2 activates PI3K/AKT but not p38MAPK-dependent cell growth and survival in osteosarcoma cells; treatment with IAP antagonist GDC-0152 suppresses ANGPTL2-induced PI3K/AKT activation and reduces cell growth and apoptosis resistance, but does not block ANGPTL2-induced p38MAPK, MMP-9/MMP-2 expression, or migration.\",\n      \"method\": \"MTT cell viability assay, migration chamber assay, Western blot for PI3K/AKT/p38MAPK, qRT-PCR and gelatin zymography for MMPs, recombinant human ANGPTL2 treatment\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pharmacological dissection of signaling pathways with defined readouts\",\n      \"pmids\": [\"25651778\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ANGPTL2 is a secreted glycoprotein that signals through at least two receptors—LILRB2 (on hematopoietic stem cells and immune cells) and CD146 (on adipocytes)—in a multimerization-dependent manner to activate downstream pathways including NF-κB (in endothelial cells), integrin α5β1/p38 MAPK/MMP (in tumor cells), AKT-SERCA2a (in cardiomyocytes), and MEK/ERK (in renal cells), thereby acting as a paracrine/autocrine driver of vascular inflammation, tumor metastasis, cardiac dysfunction, and adipose tissue remodeling; its activity is modulated by proteolytic cleavage by TLL1 and by transcriptional regulators including NFATc, ATF2, and c-Jun.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ANGPTL2 is a secreted, multimeric glycoprotein that functions as a paracrine and autocrine mediator of inflammation, tissue remodeling, and tumor metastasis across vascular, cardiac, adipose, and renal compartments. It signals through at least two identified receptors—LILRB2 on hematopoietic/immune cells, requiring ligand multimerization for activation [PMID:24899623], and CD146 on adipocytes, where it engages a CREB-dependent positive feedback loop to drive adipogenesis [PMID:33747748]—and activates distinct intracellular cascades including NF-κB in endothelial cells [PMID:24526691], integrin α5β1/p38 MAPK/MMP in tumor cells [PMID:24448647], AKT-SERCA2a in cardiomyocytes [PMID:27677409], and MEK/ERK in renal epithelial cells [PMID:31632523]. Its activity is negatively regulated by TLL1-mediated proteolytic cleavage, which generates inactive fragments [PMID:24448647], and its expression is upregulated by the transcription factors NFATc, ATF2, and c-Jun in aggressive tumor cells and by NFATc1 nuclear translocation in bone marrow macrophages [PMID:22345152, PMID:34801597].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Establishing that ANGPTL2 is not merely a circulating factor but an autocrine/paracrine driver of tumor cell invasion, answering whether tumor cells themselves use ANGPTL2 to promote metastasis and identifying NFATc/ATF2/c-Jun as transcriptional activators of ANGPTL2 in aggressive tumors.\",\n      \"evidence\": \"RNAi knockdown and overexpression in tumor cells with in vitro invasion assays and xenograft mouse models\",\n      \"pmids\": [\"22345152\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor on tumor cells mediating autocrine signaling not identified\", \"Relative contribution of each transcription factor (NFATc, ATF2, c-Jun) to ANGPTL2 expression not dissected\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating that the tissue source of ANGPTL2 matters: perivascular adipose tissue is a functionally relevant secretory source that accelerates vascular injury responses, establishing ANGPTL2 as a paracrine adipokine in vascular inflammation.\",\n      \"evidence\": \"Reciprocal adipose tissue transplantation from Angptl2-transgenic and knockout mice in wire-injury models\",\n      \"pmids\": [\"23333801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor on vascular smooth muscle cells or endothelium mediating perivascular ANGPTL2 action not identified\", \"Downstream signaling pathway in neointimal cells not delineated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolving two critical questions simultaneously: (1) endothelial cell-derived ANGPTL2 drives atherosclerosis via NF-κB-dependent monocyte recruitment, and (2) in tumor cells ANGPTL2 signals through integrin α5β1/p38 MAPK/MMPs while TLL1 protease cleavage inactivates the protein—establishing that context-specific receptor–pathway coupling and proteolytic regulation control ANGPTL2 activity.\",\n      \"evidence\": \"ApoE−/−×Angptl2−/− knockout mice with bone marrow transplantation for vascular studies; in vitro protease cleavage reconstitution, integrin/MMP signaling assays, and xenograft models for tumor studies\",\n      \"pmids\": [\"24526691\", \"24448647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of endothelial ANGPTL2 receptor for NF-κB activation unknown\", \"Structural basis of TLL1 cleavage site not mapped at residue resolution\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying LILRB2 as a receptor for ANGPTL2 and demonstrating that ligand multimerization is essential for receptor activation, answering how ANGPTL2 engages immune-inhibitory receptor signaling on hematopoietic stem cells.\",\n      \"evidence\": \"Co-immunoprecipitation, LILRB2 Ig-domain mutagenesis, binding assays, and hematopoietic stem cell expansion functional readout\",\n      \"pmids\": [\"24899623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling events linking LILRB2 activation to HSC expansion not fully mapped\", \"Whether LILRB2 mediates ANGPTL2 effects in non-hematopoietic contexts unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Dissecting that ANGPTL2 activates two separable signaling arms in osteosarcoma—PI3K/AKT for cell survival versus p38 MAPK/MMP for migration—and showing these can be pharmacologically uncoupled.\",\n      \"evidence\": \"Recombinant ANGPTL2 treatment with GDC-0152 (IAP antagonist) in osteosarcoma cells; Western blot and zymography readouts\",\n      \"pmids\": [\"25651778\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell line used; generalizability across tumor types not tested\", \"Receptor upstream of PI3K/AKT arm not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Establishing ANGPTL2 as a cardiodepressant factor: cardiac overexpression inactivates AKT-SERCA2a signaling and impairs contractility, while knockout enhances cardiac function, answering whether ANGPTL2 directly regulates myocardial performance.\",\n      \"evidence\": \"Cardiac-specific transgenic overexpression, global Angptl2 knockout, and transverse aortic constriction model with AKT/SERCA2a signaling and metabolic readouts\",\n      \"pmids\": [\"27677409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cardiac receptor for ANGPTL2 not identified\", \"Whether circulating versus local cardiac ANGPTL2 is the relevant pool in heart failure not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extending ANGPTL2's pro-fibrotic role to the kidney: ANGPTL2 promotes renal fibrosis through MEK/ERK/Nrf-1 signaling and suppresses protective autophagy, linking ANGPTL2 to diabetic nephropathy pathogenesis.\",\n      \"evidence\": \"siRNA knockdown in HK-2 cells under high glucose, streptozotocin-induced diabetic rat model, MEK inhibitor rescue\",\n      \"pmids\": [\"31632523\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Renal receptor for ANGPTL2 unknown\", \"Whether Nrf-1 is a direct or indirect target of ERK in this context not resolved\", \"Single-lab study without independent replication\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying CD146 as a second defined receptor for ANGPTL2, this time on adipocytes, and demonstrating a CREB-dependent feedforward loop that drives adipogenesis—providing the first receptor-level explanation for ANGPTL2's role in obesity.\",\n      \"evidence\": \"Co-immunoprecipitation/binding assays, CD146 knockout, anti-CD146 antibody treatment in vivo, adipogenesis assays\",\n      \"pmids\": [\"33747748\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CD146 mediates ANGPTL2 signaling in non-adipocyte contexts (e.g. endothelium) not tested\", \"Structural basis of ANGPTL2–CD146 interaction not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealing a tumor microenvironment feedback loop: tumor-derived extracellular vesicle miR-378a-3p activates NFATc1 in bone marrow macrophages, upregulating Angptl2 secretion that in turn promotes prostate cancer progression.\",\n      \"evidence\": \"EV uptake experiments, Dyrk1a inhibition, NFATc1 nuclear translocation assays, in vitro and in vivo tumor progression models\",\n      \"pmids\": [\"34801597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor on tumor cells through which macrophage-derived ANGPTL2 acts not identified\", \"Whether this EV-mediated loop operates in other cancer types unknown\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The endothelial and cardiac receptors for ANGPTL2 remain unidentified; the structural determinants of multimerization-dependent receptor selectivity between LILRB2 and CD146 are unknown; and it is unclear how TLL1 cleavage is regulated in vivo to control ANGPTL2 bioactivity across tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of ANGPTL2 multimer or receptor complexes\", \"Endothelial and cardiac ANGPTL2 receptors not identified\", \"In vivo regulation of TLL1 cleavage of ANGPTL2 not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 3, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 2, 5, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 4, 6, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 2, 7, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"LILRB2\", \"CD146\", \"TLL1\", \"SERCA2a\"],\n    \"other_free_text\": []\n  }\n}\n```"}