{"gene":"F2RL2","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2015,"finding":"Thrombin activates PAR3 (F2RL2) by cleaving its N-terminus to expose a tethered ligand sequence, which stimulates insulin secretion in pancreatic islets via phospholipase C activation and Ca2+ release from intracellular stores; a blocking antibody against the thrombin cleavage site of PAR3 prevented this effect, and a peptide corresponding to the PAR3 tethered ligand was sufficient to stimulate single β-cell exocytosis.","method":"Static insulin secretion measurements, capacitance measurements (single β-cell exocytosis), blocking antibody against thrombin cleavage site, tethered ligand peptide treatment, pharmacological inhibition of PLC and Ca2+ stores","journal":"Islets","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal functional assays (insulin secretion, capacitance measurements, blocking antibody, peptide agonist, signaling pathway inhibitors) in a single study with rigorous mechanistic follow-up","pmids":["26742564"],"is_preprint":false},{"year":2017,"finding":"Hypomethylation of a CpG locus mapping to F2rl2 (PAR3) in Bhmt-null mouse liver results in underexpression of F2rl2 at all examined time points (4, 12, 24, and 52 weeks), demonstrating that BHMT-dependent DNA methylation regulates F2rl2 transcriptional activity in the liver.","method":"Genome-wide DNA methylation profiling (RRBS) combined with RNA-seq expression analysis in Bhmt-null vs. wild-type mice at multiple time points; correlation of DMCs with gene expression changes","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal genome-wide methods (methylome + transcriptome) in a single lab showing consistent association across multiple time points, but functional consequence of F2rl2 underexpression was not directly tested","pmids":["28179424"],"is_preprint":false},{"year":2023,"finding":"NRF2 (Nuclear factor erythroid 2-related factor 2) directly binds to the promoter region of F2RL2 in human neural progenitor cells (NPCs) and transcriptionally upregulates its expression in response to lead (Pb) and arsenic (As) exposure; F2RL2 knockdown in NPCs affected cell death, proliferation, and differentiation both in the presence and absence of metal exposures.","method":"ChIP-qPCR demonstrating NRF2 binding to F2RL2 promoter; siRNA knockdown with cell viability, proliferation, and differentiation assays","journal":"Journal of hazardous materials","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP-qPCR evidence for NRF2 promoter binding combined with loss-of-function phenotypic readouts in a single lab study","pmids":["37939567"],"is_preprint":false},{"year":2025,"finding":"MicroRNA-5572 directly targets F2RL2 in orbital fibroblasts derived from thyroid eye disease (TED) patients; dual-luciferase reporter assay confirmed binding between miR-5572 and F2RL2; inhibiting miR-5572 increased COL1A1 protein expression via F2RL2, while downregulation of miR-5572 in TED-OFs promotes fibrosis through this F2RL2-dependent mechanism.","method":"Dual-luciferase reporter assay confirming miR-5572 binding to F2RL2; qRT-PCR and western blot for F2RL2 and COL1A1; miR-5572 inhibitor transfection in orbital fibroblasts","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dual-luciferase validates direct miRNA-target interaction; functional consequence (COL1A1 upregulation) confirmed by western blot, single lab study","pmids":["40750003"],"is_preprint":false},{"year":2022,"finding":"NEAT1 (lncRNA) acts as a competing endogenous RNA (ceRNA) sponge for miR-582-5p, which directly targets F2RL2; downregulation of F2RL2 reduced infarct area and cell apoptosis in MI mouse models and protected OGD-induced cardiomyocytes; NEAT1 silencing upregulated miR-582-5p and downregulated F2RL2; miR-582-5p inhibitor reversed NEAT1 silencing effects, and this was further offset by F2RL2 downregulation, placing F2RL2 downstream of the NEAT1/miR-582-5p axis in myocardial infarction.","method":"Dual-luciferase reporter assay for miR-582-5p/F2RL2 interaction; MI mouse model with echocardiography, TTC/Evans blue staining, TUNEL; OGD cell model with siRNA knockdown, CCK-8, EdU, flow cytometry; qRT-PCR and western blot","journal":"Cardiovascular therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dual-luciferase validates miRNA-target interaction; epistasis rescue experiment places F2RL2 in the NEAT1/miR-582-5p axis; multiple functional readouts in both in vivo and in vitro models, single lab","pmids":["36540097"],"is_preprint":false},{"year":2023,"finding":"MiR-125b-5p reduces F2RL2 expression indirectly by inhibiting NFAT2, which acts as a transcriptional activator of F2RL2; in OGD-induced endothelial cells, NFAT2 overexpression reversed the protective effects of miR-125b-5p, while F2RL2 silencing offset the effects of NFAT2 overexpression, establishing a miR-125b-5p → NFAT2 → F2RL2 regulatory axis in myocardial infarction.","method":"OGD cell model; miR-125b-5p mimic/inhibitor transfection; NFAT2 overexpression; F2RL2 siRNA knockdown; cell viability, apoptosis, inflammatory factor measurements; MI mouse model","journal":"Regenerative medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic rescue experiments define pathway ordering (miR-125b-5p → NFAT2 → F2RL2) across in vivo and in vitro models; single lab, multiple orthogonal cellular readouts","pmids":["37340944"],"is_preprint":false},{"year":2023,"finding":"A purified serine protease (chicken trypsin II-P29) from poultry organic dust activated PAR family members including F2RL2 in lung epithelial cells, as assessed by calcium mobilization studies; knockdown of F2R and F2RL1 (but not specifically F2RL2 alone) suppressed induction of inflammatory mediators, suggesting PAR activation contributes to lung inflammation.","method":"Calcium mobilization assay for PAR activation; siRNA knockdown of F2R and F2RL1 with inflammatory mediator readout; purified protease treatment of Beas2B, NHBE, and THP-1 cells","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — calcium mobilization suggests F2RL2 activation but functional knockdown experiments used F2R and F2RL1, not F2RL2 specifically; F2RL2's individual contribution not independently confirmed","pmids":["37253661"],"is_preprint":false},{"year":2023,"finding":"In vitro screening of class A GPCRs in mesenchymal stromal cells identified F2RL2 as one of six target receptors (alongside LPAR1, F2R, F2RL1, S1PR1, and ADORA2A) whose activation promotes biomineralization/osteogenic differentiation; transcriptome and ATAC-seq profiling identified p53 as a key transcriptional activator downstream of these GPCRs in the mineralization process.","method":"In vitro GPCR screening assay for biomineralization; whole transcriptome and ATAC-seq profiling; tooth pulpotomy and calvarial defect in vivo models","journal":"Biomaterials","confidence":"Low","confidence_rationale":"Tier 3 / Weak — F2RL2 identified as one of six receptors in a screen; specific downstream pathway attributed to the class rather than F2RL2 individually; no F2RL2-specific knockdown or mutagenesis","pmids":["38100905"],"is_preprint":false},{"year":2022,"finding":"Immunohistochemistry revealed F2RL2 protein expression in cone photoreceptor outer segments and Müller glia cells of human and pig retinas; F2RL2 expression appeared increased in fibrotic areas in advanced AMD samples with neovascularization, suggesting a role in progression to advanced macular disease.","method":"Immunohistochemistry on human and pig retinal tissues; genetic association study identifying missense variant F2RL2 p.Leu289Arg in maculopathy families","journal":"Ophthalmology science","confidence":"Low","confidence_rationale":"Tier 3 / Weak — protein localization by IHC provides subcellular/cell-type information but functional consequence not experimentally tested; variant identification is genetic association without functional validation","pmids":["36275200"],"is_preprint":false}],"current_model":"F2RL2 (PAR3) is a G protein-coupled protease-activated receptor cleaved by thrombin to expose a tethered ligand that activates phospholipase C and Ca2+ signaling to stimulate insulin secretion in pancreatic β-cells; its transcription is directly regulated by NRF2 (via promoter binding) and by BHMT-dependent DNA methylation, while its expression is post-transcriptionally controlled by multiple miRNA axes (miR-582-5p via NEAT1 sponging; miR-125b-5p via NFAT2) that modulate cardiac myocyte survival, and by miR-5572 in orbital fibroblasts where its downregulation drives COL1A1-dependent fibrosis."},"narrative":{"mechanistic_narrative":"F2RL2 (PAR3) is a protease-activated G protein-coupled receptor whose N-terminus is cleaved by thrombin to expose a tethered ligand that drives phospholipase C activation and intracellular Ca2+ release; in pancreatic islets this signaling stimulates β-cell exocytosis and insulin secretion, as a thrombin-cleavage-site blocking antibody abolished the response and a tethered-ligand peptide alone was sufficient to trigger exocytosis [PMID:26742564]. Beyond this receptor-level mechanism, the available corpus characterizes F2RL2 primarily through its transcriptional and post-transcriptional control: NRF2 binds the F2RL2 promoter and upregulates it in neural progenitor cells in response to lead and arsenic, where F2RL2 loss alters cell death, proliferation, and differentiation [PMID:37939567], and BHMT-dependent DNA methylation regulates its expression in liver [PMID:28179424]. Multiple miRNA axes converge on F2RL2 to set its expression level in disease contexts—the NEAT1/miR-582-5p axis [PMID:36540097] and a miR-125b-5p→NFAT2 axis [PMID:37340944] place F2RL2 downstream as a modulator of cardiomyocyte and endothelial apoptosis in myocardial infarction, while miR-5572 directly targets F2RL2 in orbital fibroblasts, with its loss promoting COL1A1-dependent fibrosis [PMID:40750003].","teleology":[{"year":2015,"claim":"Established the core molecular mechanism of F2RL2 as a thrombin-activated receptor coupled to a functional output, answering how the receptor transduces protease signals into a physiological response.","evidence":"Insulin secretion and single-β-cell capacitance assays in islets with thrombin-cleavage-site blocking antibody, tethered-ligand peptide agonist, and PLC/Ca2+ inhibitors","pmids":["26742564"],"confidence":"High","gaps":["G protein coupling identity not defined","No structural data on the receptor or tethered ligand engagement","Role outside pancreatic β-cells not addressed"]},{"year":2017,"claim":"Showed that F2rl2 expression is set by DNA methylation, identifying an epigenetic input controlling receptor abundance in liver.","evidence":"RRBS methylome plus RNA-seq in Bhmt-null vs wild-type mouse liver across four time points","pmids":["28179424"],"confidence":"Medium","gaps":["Functional consequence of F2rl2 underexpression not tested","Causality between specific CpG methylation and transcription not directly demonstrated","Relevance to human F2RL2 unknown"]},{"year":2022,"claim":"Defined F2RL2 as a downstream effector of an lncRNA/miRNA axis controlling cardiomyocyte survival, framing it as a pro-apoptotic node in myocardial infarction.","evidence":"Dual-luciferase miR-582-5p/F2RL2 reporter, NEAT1 silencing epistasis, MI mouse model and OGD cardiomyocyte assays","pmids":["36540097"],"confidence":"Medium","gaps":["Receptor-level signaling mechanism in cardiomyocytes not dissected","Single-lab study","Endogenous ligand driving F2RL2 in ischemia not identified"]},{"year":2022,"claim":"Provided protein-level localization and a candidate disease variant, placing F2RL2 in retinal cell types relevant to macular disease.","evidence":"Immunohistochemistry in human and pig retina plus genetic association of F2RL2 p.Leu289Arg in maculopathy families","pmids":["36275200"],"confidence":"Low","gaps":["Functional consequence of the variant not tested","Causal role in AMD progression not established","IHC localization not corroborated by functional assay"]},{"year":2023,"claim":"Identified NRF2 as a direct transcriptional activator of F2RL2 linking xenobiotic/oxidative stress to receptor expression and neural progenitor fate.","evidence":"ChIP-qPCR for NRF2 binding to F2RL2 promoter plus siRNA knockdown with viability, proliferation and differentiation readouts in NPCs","pmids":["37939567"],"confidence":"Medium","gaps":["Downstream signaling connecting F2RL2 to fate decisions undefined","Single-lab study","Whether receptor activity or expression level drives the phenotype unclear"]},{"year":2023,"claim":"Resolved an indirect miRNA route to F2RL2 via the transcription factor NFAT2, ordering a regulatory axis affecting endothelial survival in ischemia.","evidence":"miR-125b-5p mimic/inhibitor, NFAT2 overexpression and F2RL2 siDNA rescue experiments in OGD endothelial cells and MI mouse model","pmids":["37340944"],"confidence":"Medium","gaps":["Direct NFAT2 binding to F2RL2 promoter not shown","Receptor signaling mechanism not addressed","Single-lab study"]},{"year":2023,"claim":"Tested whether F2RL2 participates in protease-driven airway inflammation, but left its individual contribution unresolved.","evidence":"Calcium mobilization assay with purified chicken trypsin II-P29; functional knockdown used F2R and F2RL1 rather than F2RL2","pmids":["37253661"],"confidence":"Low","gaps":["F2RL2-specific knockdown not performed","Direct cleavage of F2RL2 by the protease not demonstrated","Individual contribution to inflammation not isolated"]},{"year":2023,"claim":"Implicated F2RL2 among GPCRs promoting osteogenic differentiation, but as part of a receptor class rather than individually validated.","evidence":"In vitro GPCR screen for biomineralization with transcriptome/ATAC-seq and in vivo bone/pulp models","pmids":["38100905"],"confidence":"Low","gaps":["No F2RL2-specific knockdown or mutagenesis","Downstream p53 pathway attributed to the class not F2RL2","Ligand and signaling in this context undefined"]},{"year":2025,"claim":"Showed direct miRNA targeting of F2RL2 controls a fibrotic output, linking receptor expression to collagen production in orbital fibroblasts.","evidence":"Dual-luciferase miR-5572/F2RL2 reporter, miR-5572 inhibitor transfection, qRT-PCR and western blot for F2RL2 and COL1A1","pmids":["40750003"],"confidence":"Medium","gaps":["Mechanism linking F2RL2 to COL1A1 not dissected","Receptor signaling vs expression role unclear","Single-lab study in one cell type"]},{"year":null,"claim":"How F2RL2's thrombin-activated receptor signaling mechanistically connects to its diverse disease phenotypes (cardiac apoptosis, fibrosis, neural differentiation, macular disease) remains unresolved, as does its G protein coupling and endogenous activating proteases across these tissues.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of receptor or tethered-ligand engagement","G protein/effector coupling beyond PLC/Ca2+ undefined","Mechanistic link between expression-level regulation and downstream phenotypes unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00254","full_name":"Proteinase-activated receptor 3","aliases":["Coagulation factor II receptor-like 2","Thrombin receptor-like 2"],"length_aa":374,"mass_kda":42.5,"function":"Receptor for activated thrombin coupled to G proteins that stimulate phosphoinositide hydrolysis","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/O00254/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/F2RL2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/F2RL2","total_profiled":1310},"omim":[{"mim_id":"601919","title":"COAGULATION FACTOR II RECEPTOR-LIKE 2; F2RL2","url":"https://www.omim.org/entry/601919"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"gallbladder","ntpm":6.4}],"url":"https://www.proteinatlas.org/search/F2RL2"},"hgnc":{"alias_symbol":["PAR3"],"prev_symbol":[]},"alphafold":{"accession":"O00254","domains":[{"cath_id":"1.20.1070.10","chopping":"81-373","consensus_level":"high","plddt":86.2718,"start":81,"end":373}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00254","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00254-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00254-F1-predicted_aligned_error_v6.png","plddt_mean":76.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=F2RL2","jax_strain_url":"https://www.jax.org/strain/search?query=F2RL2"},"sequence":{"accession":"O00254","fasta_url":"https://rest.uniprot.org/uniprotkb/O00254.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00254/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00254"}},"corpus_meta":[{"pmid":"22759920","id":"PMC_22759920","title":"Evidence 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a blocking antibody against the thrombin cleavage site of PAR3 prevented this effect, and a peptide corresponding to the PAR3 tethered ligand was sufficient to stimulate single β-cell exocytosis.\",\n      \"method\": \"Static insulin secretion measurements, capacitance measurements (single β-cell exocytosis), blocking antibody against thrombin cleavage site, tethered ligand peptide treatment, pharmacological inhibition of PLC and Ca2+ stores\",\n      \"journal\": \"Islets\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal functional assays (insulin secretion, capacitance measurements, blocking antibody, peptide agonist, signaling pathway inhibitors) in a single study with rigorous mechanistic follow-up\",\n      \"pmids\": [\"26742564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hypomethylation of a CpG locus mapping to F2rl2 (PAR3) in Bhmt-null mouse liver results in underexpression of F2rl2 at all examined time points (4, 12, 24, and 52 weeks), demonstrating that BHMT-dependent DNA methylation regulates F2rl2 transcriptional activity in the liver.\",\n      \"method\": \"Genome-wide DNA methylation profiling (RRBS) combined with RNA-seq expression analysis in Bhmt-null vs. wild-type mice at multiple time points; correlation of DMCs with gene expression changes\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal genome-wide methods (methylome + transcriptome) in a single lab showing consistent association across multiple time points, but functional consequence of F2rl2 underexpression was not directly tested\",\n      \"pmids\": [\"28179424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRF2 (Nuclear factor erythroid 2-related factor 2) directly binds to the promoter region of F2RL2 in human neural progenitor cells (NPCs) and transcriptionally upregulates its expression in response to lead (Pb) and arsenic (As) exposure; F2RL2 knockdown in NPCs affected cell death, proliferation, and differentiation both in the presence and absence of metal exposures.\",\n      \"method\": \"ChIP-qPCR demonstrating NRF2 binding to F2RL2 promoter; siRNA knockdown with cell viability, proliferation, and differentiation assays\",\n      \"journal\": \"Journal of hazardous materials\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP-qPCR evidence for NRF2 promoter binding combined with loss-of-function phenotypic readouts in a single lab study\",\n      \"pmids\": [\"37939567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MicroRNA-5572 directly targets F2RL2 in orbital fibroblasts derived from thyroid eye disease (TED) patients; dual-luciferase reporter assay confirmed binding between miR-5572 and F2RL2; inhibiting miR-5572 increased COL1A1 protein expression via F2RL2, while downregulation of miR-5572 in TED-OFs promotes fibrosis through this F2RL2-dependent mechanism.\",\n      \"method\": \"Dual-luciferase reporter assay confirming miR-5572 binding to F2RL2; qRT-PCR and western blot for F2RL2 and COL1A1; miR-5572 inhibitor transfection in orbital fibroblasts\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dual-luciferase validates direct miRNA-target interaction; functional consequence (COL1A1 upregulation) confirmed by western blot, single lab study\",\n      \"pmids\": [\"40750003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NEAT1 (lncRNA) acts as a competing endogenous RNA (ceRNA) sponge for miR-582-5p, which directly targets F2RL2; downregulation of F2RL2 reduced infarct area and cell apoptosis in MI mouse models and protected OGD-induced cardiomyocytes; NEAT1 silencing upregulated miR-582-5p and downregulated F2RL2; miR-582-5p inhibitor reversed NEAT1 silencing effects, and this was further offset by F2RL2 downregulation, placing F2RL2 downstream of the NEAT1/miR-582-5p axis in myocardial infarction.\",\n      \"method\": \"Dual-luciferase reporter assay for miR-582-5p/F2RL2 interaction; MI mouse model with echocardiography, TTC/Evans blue staining, TUNEL; OGD cell model with siRNA knockdown, CCK-8, EdU, flow cytometry; qRT-PCR and western blot\",\n      \"journal\": \"Cardiovascular therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dual-luciferase validates miRNA-target interaction; epistasis rescue experiment places F2RL2 in the NEAT1/miR-582-5p axis; multiple functional readouts in both in vivo and in vitro models, single lab\",\n      \"pmids\": [\"36540097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MiR-125b-5p reduces F2RL2 expression indirectly by inhibiting NFAT2, which acts as a transcriptional activator of F2RL2; in OGD-induced endothelial cells, NFAT2 overexpression reversed the protective effects of miR-125b-5p, while F2RL2 silencing offset the effects of NFAT2 overexpression, establishing a miR-125b-5p → NFAT2 → F2RL2 regulatory axis in myocardial infarction.\",\n      \"method\": \"OGD cell model; miR-125b-5p mimic/inhibitor transfection; NFAT2 overexpression; F2RL2 siRNA knockdown; cell viability, apoptosis, inflammatory factor measurements; MI mouse model\",\n      \"journal\": \"Regenerative medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic rescue experiments define pathway ordering (miR-125b-5p → NFAT2 → F2RL2) across in vivo and in vitro models; single lab, multiple orthogonal cellular readouts\",\n      \"pmids\": [\"37340944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A purified serine protease (chicken trypsin II-P29) from poultry organic dust activated PAR family members including F2RL2 in lung epithelial cells, as assessed by calcium mobilization studies; knockdown of F2R and F2RL1 (but not specifically F2RL2 alone) suppressed induction of inflammatory mediators, suggesting PAR activation contributes to lung inflammation.\",\n      \"method\": \"Calcium mobilization assay for PAR activation; siRNA knockdown of F2R and F2RL1 with inflammatory mediator readout; purified protease treatment of Beas2B, NHBE, and THP-1 cells\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — calcium mobilization suggests F2RL2 activation but functional knockdown experiments used F2R and F2RL1, not F2RL2 specifically; F2RL2's individual contribution not independently confirmed\",\n      \"pmids\": [\"37253661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In vitro screening of class A GPCRs in mesenchymal stromal cells identified F2RL2 as one of six target receptors (alongside LPAR1, F2R, F2RL1, S1PR1, and ADORA2A) whose activation promotes biomineralization/osteogenic differentiation; transcriptome and ATAC-seq profiling identified p53 as a key transcriptional activator downstream of these GPCRs in the mineralization process.\",\n      \"method\": \"In vitro GPCR screening assay for biomineralization; whole transcriptome and ATAC-seq profiling; tooth pulpotomy and calvarial defect in vivo models\",\n      \"journal\": \"Biomaterials\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — F2RL2 identified as one of six receptors in a screen; specific downstream pathway attributed to the class rather than F2RL2 individually; no F2RL2-specific knockdown or mutagenesis\",\n      \"pmids\": [\"38100905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Immunohistochemistry revealed F2RL2 protein expression in cone photoreceptor outer segments and Müller glia cells of human and pig retinas; F2RL2 expression appeared increased in fibrotic areas in advanced AMD samples with neovascularization, suggesting a role in progression to advanced macular disease.\",\n      \"method\": \"Immunohistochemistry on human and pig retinal tissues; genetic association study identifying missense variant F2RL2 p.Leu289Arg in maculopathy families\",\n      \"journal\": \"Ophthalmology science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — protein localization by IHC provides subcellular/cell-type information but functional consequence not experimentally tested; variant identification is genetic association without functional validation\",\n      \"pmids\": [\"36275200\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"F2RL2 (PAR3) is a G protein-coupled protease-activated receptor cleaved by thrombin to expose a tethered ligand that activates phospholipase C and Ca2+ signaling to stimulate insulin secretion in pancreatic β-cells; its transcription is directly regulated by NRF2 (via promoter binding) and by BHMT-dependent DNA methylation, while its expression is post-transcriptionally controlled by multiple miRNA axes (miR-582-5p via NEAT1 sponging; miR-125b-5p via NFAT2) that modulate cardiac myocyte survival, and by miR-5572 in orbital fibroblasts where its downregulation drives COL1A1-dependent fibrosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"F2RL2 (PAR3) is a protease-activated G protein-coupled receptor whose N-terminus is cleaved by thrombin to expose a tethered ligand that drives phospholipase C activation and intracellular Ca2+ release; in pancreatic islets this signaling stimulates β-cell exocytosis and insulin secretion, as a thrombin-cleavage-site blocking antibody abolished the response and a tethered-ligand peptide alone was sufficient to trigger exocytosis [#0]. Beyond this receptor-level mechanism, the available corpus characterizes F2RL2 primarily through its transcriptional and post-transcriptional control: NRF2 binds the F2RL2 promoter and upregulates it in neural progenitor cells in response to lead and arsenic, where F2RL2 loss alters cell death, proliferation, and differentiation [#2], and BHMT-dependent DNA methylation regulates its expression in liver [#1]. Multiple miRNA axes converge on F2RL2 to set its expression level in disease contexts—the NEAT1/miR-582-5p axis [#4] and a miR-125b-5p→NFAT2 axis [#5] place F2RL2 downstream as a modulator of cardiomyocyte and endothelial apoptosis in myocardial infarction, while miR-5572 directly targets F2RL2 in orbital fibroblasts, with its loss promoting COL1A1-dependent fibrosis [#3].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2015,\n      \"claim\": \"Established the core molecular mechanism of F2RL2 as a thrombin-activated receptor coupled to a functional output, answering how the receptor transduces protease signals into a physiological response.\",\n      \"evidence\": \"Insulin secretion and single-β-cell capacitance assays in islets with thrombin-cleavage-site blocking antibody, tethered-ligand peptide agonist, and PLC/Ca2+ inhibitors\",\n      \"pmids\": [\"26742564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"G protein coupling identity not defined\", \"No structural data on the receptor or tethered ligand engagement\", \"Role outside pancreatic β-cells not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed that F2rl2 expression is set by DNA methylation, identifying an epigenetic input controlling receptor abundance in liver.\",\n      \"evidence\": \"RRBS methylome plus RNA-seq in Bhmt-null vs wild-type mouse liver across four time points\",\n      \"pmids\": [\"28179424\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of F2rl2 underexpression not tested\", \"Causality between specific CpG methylation and transcription not directly demonstrated\", \"Relevance to human F2RL2 unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined F2RL2 as a downstream effector of an lncRNA/miRNA axis controlling cardiomyocyte survival, framing it as a pro-apoptotic node in myocardial infarction.\",\n      \"evidence\": \"Dual-luciferase miR-582-5p/F2RL2 reporter, NEAT1 silencing epistasis, MI mouse model and OGD cardiomyocyte assays\",\n      \"pmids\": [\"36540097\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor-level signaling mechanism in cardiomyocytes not dissected\", \"Single-lab study\", \"Endogenous ligand driving F2RL2 in ischemia not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided protein-level localization and a candidate disease variant, placing F2RL2 in retinal cell types relevant to macular disease.\",\n      \"evidence\": \"Immunohistochemistry in human and pig retina plus genetic association of F2RL2 p.Leu289Arg in maculopathy families\",\n      \"pmids\": [\"36275200\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Functional consequence of the variant not tested\", \"Causal role in AMD progression not established\", \"IHC localization not corroborated by functional assay\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified NRF2 as a direct transcriptional activator of F2RL2 linking xenobiotic/oxidative stress to receptor expression and neural progenitor fate.\",\n      \"evidence\": \"ChIP-qPCR for NRF2 binding to F2RL2 promoter plus siRNA knockdown with viability, proliferation and differentiation readouts in NPCs\",\n      \"pmids\": [\"37939567\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream signaling connecting F2RL2 to fate decisions undefined\", \"Single-lab study\", \"Whether receptor activity or expression level drives the phenotype unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolved an indirect miRNA route to F2RL2 via the transcription factor NFAT2, ordering a regulatory axis affecting endothelial survival in ischemia.\",\n      \"evidence\": \"miR-125b-5p mimic/inhibitor, NFAT2 overexpression and F2RL2 siDNA rescue experiments in OGD endothelial cells and MI mouse model\",\n      \"pmids\": [\"37340944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct NFAT2 binding to F2RL2 promoter not shown\", \"Receptor signaling mechanism not addressed\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Tested whether F2RL2 participates in protease-driven airway inflammation, but left its individual contribution unresolved.\",\n      \"evidence\": \"Calcium mobilization assay with purified chicken trypsin II-P29; functional knockdown used F2R and F2RL1 rather than F2RL2\",\n      \"pmids\": [\"37253661\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"F2RL2-specific knockdown not performed\", \"Direct cleavage of F2RL2 by the protease not demonstrated\", \"Individual contribution to inflammation not isolated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Implicated F2RL2 among GPCRs promoting osteogenic differentiation, but as part of a receptor class rather than individually validated.\",\n      \"evidence\": \"In vitro GPCR screen for biomineralization with transcriptome/ATAC-seq and in vivo bone/pulp models\",\n      \"pmids\": [\"38100905\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No F2RL2-specific knockdown or mutagenesis\", \"Downstream p53 pathway attributed to the class not F2RL2\", \"Ligand and signaling in this context undefined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed direct miRNA targeting of F2RL2 controls a fibrotic output, linking receptor expression to collagen production in orbital fibroblasts.\",\n      \"evidence\": \"Dual-luciferase miR-5572/F2RL2 reporter, miR-5572 inhibitor transfection, qRT-PCR and western blot for F2RL2 and COL1A1\",\n      \"pmids\": [\"40750003\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking F2RL2 to COL1A1 not dissected\", \"Receptor signaling vs expression role unclear\", \"Single-lab study in one cell type\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How F2RL2's thrombin-activated receptor signaling mechanistically connects to its diverse disease phenotypes (cardiac apoptosis, fibrosis, neural differentiation, macular disease) remains unresolved, as does its G protein coupling and endogenous activating proteases across these tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of receptor or tethered-ligand engagement\", \"G protein/effector coupling beyond PLC/Ca2+ undefined\", \"Mechanistic link between expression-level regulation and downstream phenotypes unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":3,"faith_total":3,"faith_pct":100.0}}