{"gene":"ACE","run_date":"2026-06-09T22:02:38","timeline":{"discoveries":[{"year":2003,"finding":"ACE exists as two isoforms in mammals: a single-domain germinal (testicular) isoform required for male fertility, and a double-domain somatic isoform with a key role in the renin-angiotensin system. Both somatic domains are catalytically active but have different substrate affinities. Mouse knockout experiments demonstrated these two domains have clearly distinct biological roles.","method":"Mouse knockout experiments, comparative biochemistry with invertebrate homologues, enzymatic substrate assays","journal":"The international journal of biochemistry & cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse knockout with defined phenotypes, replicated across labs, domain-specific activity assays with multiple orthogonal approaches","pmids":["12676162"],"is_preprint":false},{"year":2008,"finding":"ACE (CD143) enzymatic activity is required for hemangioblast expansion from human embryonic stem cells, and ACE/renin-angiotensin system signaling through AGTR1 and AGTR2 receptors directly regulates hemangioblast differentiation toward endothelial or hematopoietic lineages.","method":"Human embryonic stem cell differentiation assays, ACE inhibitor treatment, AGTR1/AGTR2-specific inhibitors, flow cytometry for ACE+CD45-CD34+/- hemangioblasts","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional inhibitor studies with defined cellular phenotype, single lab, multiple orthogonal approaches (enzymatic inhibition + receptor-specific antagonists)","pmids":["18728246"],"is_preprint":false},{"year":2008,"finding":"ACE modulates macrophage polarization independently of its enzymatic activity: overexpression of ACE in macrophages reduced pro-inflammatory cytokine production (TNF-α, IL-6, MCP-1), and this effect was insensitive to ACE inhibition but sensitive to ACE siRNA knockdown, indicating a non-catalytic intracellular signaling role. Adipocyte-derived lipids upregulate ACE expression via AMPK phosphorylation.","method":"siRNA knockdown of ACE, ACE overexpression in THP-1 cells, ACE inhibitor treatment (negative control), AMPK inhibition, AMPKα1 knockout mouse macrophages, cytokine measurements","journal":"Basic research in cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown, overexpression, KO mouse cells, and pharmacological inhibition as negative control; single lab with multiple orthogonal methods","pmids":["21116821"],"is_preprint":false},{"year":2008,"finding":"ACE activity is modulated by its heterodimerization with the bradykinin B2 receptor: coexpression of the kinin B2 receptor with somatic ACE in CHO cells augmented ACE catalytic activity, and this effect was blocked by the B2 receptor antagonist icatibant. Endothelial cells from kinin B2 receptor knockout mice showed decreased ACE activity.","method":"Coexpression in CHO cells with FRET-based enzymatic activity assay, B2 receptor antagonist icatibant, kinin B2 receptor knockout mouse endothelial cells","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based coexpression with pharmacological blockade and confirmed in knockout mouse cells; single lab, two complementary systems","pmids":["18212275"],"is_preprint":false},{"year":2002,"finding":"ACE inhibitors at nanomolar concentrations directly activate the bradykinin B1 receptor at its Zn-binding HEXXH motif (residues 195-199) independently of ACE enzymatic activity and without peptide ligands, elevating intracellular calcium and releasing NO. Site-directed mutagenesis of H195 to alanine abolished ACE inhibitor-induced B1 receptor activation but not peptide ligand activation.","method":"Cell-based calcium assay, NO measurement, site-directed mutagenesis (H195A), synthetic peptide competition, B1 receptor antagonist","journal":"International immunopharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-directed mutagenesis combined with pharmacological and peptide competition experiments identifying specific mechanism; single lab with multiple orthogonal methods","pmids":["12489793"],"is_preprint":false},{"year":2016,"finding":"Lysozyme (a blood protein) and bilirubin (a low-molecular-weight effector) bind to ACE and regulate its conformation and shedding from endothelial cell surfaces. An ACE mutation (Arg532Trp in the N domain) that disrupts the lysozyme binding site increases blood ACE activity 7-fold by increasing shedding.","method":"Novel ACE gene mutation characterization, protein binding identification, conformational analysis using monoclonal antibody panel (ACE phenotyping), electron microscopy","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — natural mutation with defined phenotype, binding partner identification, conformational fingerprinting; single lab with multiple methods","pmids":["27734897"],"is_preprint":false},{"year":2009,"finding":"Fine epitope mapping of anti-ACE monoclonal antibodies 9B9 and 3G8 identified that a region in the N-terminal N domain (involving residues Q18, L19, Q22) regulates ACE dimerization and shedding. Point mutations Q18H, L19E, and Q22A in full-length somatic ACE increased cell-surface ACE expression, basal shedding, and the amount of cross-linked ACE dimer.","method":"Site-directed mutagenesis (Q18H, L19E, Q22A) of full-length somatic ACE expressed in CHO cells, monoclonal antibody epitope mapping, cross-linking and western blot, flow cytometry","journal":"Tissue antigens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with defined functional consequences for shedding and dimerization; single lab with multiple readouts","pmids":["20003136"],"is_preprint":false},{"year":2004,"finding":"ACE and ACE2 are co-expressed in renal tubules, with ACE protein markedly reduced and ACE2 protein increased in kidneys of diabetic (db/db) mice compared to controls, accompanied by a corresponding decrease in renal ACE enzymatic activity. This reciprocal pattern was not observed in heart tissue.","method":"Western blot, immunohistochemistry, fluorometric ACE activity assay, RT-PCR for mRNA; comparison of db/db diabetic vs db/m control mice","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein quantification, enzyme activity, and localization in matched tissues with controls; single lab, three orthogonal methods","pmids":["15078862"],"is_preprint":false},{"year":2010,"finding":"ACE and ACE2 bind integrin subunits in an RGD-independent manner and can act as cell adhesion substrates. Cellular expression of ACE2 enhanced cell adhesion. Soluble ACE2 suppressed integrin signaling mediated by FAK and altered Akt expression levels.","method":"Co-immunoprecipitation (Co-IP) of ACE/ACE2 with integrin subunits, cell adhesion assays, FAK phosphorylation measurement, Akt western blot","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP binding and cell-based functional assays; single lab, multiple readouts but no mutagenesis to map interaction","pmids":["22523556"],"is_preprint":false},{"year":2022,"finding":"Radiation directly activates ACE within myeloid immune cells, increasing ACE activity and reactive oxygen species (ROS) generation via NADPH oxidase 2 and type 1 angiotensin receptor signaling. ACE inhibition with lisinopril blocked radiation-induced ACE activation and ROS production in human monocytes and reduced lung myeloid cell infiltration in vivo.","method":"In vitro radiation of human monocytes/THP-1 cells with ACE activity measurement, ROS assay, NADPH oxidase 2 inhibitor, AT1 receptor inhibitor; rat partial body irradiation model with lisinopril treatment, flow cytometry for lung immune cells, BAL cytokine measurement","journal":"International journal of radiation oncology, biology, physics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic pathway dissection with pharmacological inhibitors combined with in vivo model; single lab, multiple orthogonal methods","pmids":["35093482"],"is_preprint":false},{"year":2019,"finding":"Myeloid-specific ACE overexpression (ACE10 mouse model) paradoxically reduced atherosclerotic plaque burden in ApoE-deficient mice on an atherogenic diet. Bone marrow transplantation demonstrated this effect was mediated by myeloid-lineage ACE, as ACE10 bone marrow recipients showed significantly reduced lesion areas compared to wild-type bone marrow recipients.","method":"ACE10 transgenic mouse model with myeloid-specific ACE overexpression, ApoE-/- cross, atherogenic diet, bone marrow transplantation, plaque quantification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic gain-of-function with bone marrow transfer to establish cell-type specificity; single lab, defined phenotypic readout","pmids":["31615657"],"is_preprint":false},{"year":2010,"finding":"ACE expression in the vascular endothelium is heterogeneous and vessel-, organ-, and species-specific: in humans, small muscular arteries and arterioles display high ACE immunoreactivity while large arteries, veins, and renal vasculature show little or no ACE. In the lung, all capillary endothelial cells are intensely ACE-positive. This pattern was determined by direct immunohistochemistry of the entire human vascular tree.","method":"Immunohistochemistry of serial sections from the complete human vascular tree using a panel of monoclonal antibodies, comparison with other endothelial markers","journal":"Microvascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic direct localization across the entire vascular tree with antibody panel; single study but comprehensive anatomical coverage","pmids":["21167844"],"is_preprint":false},{"year":1998,"finding":"ACE (kininase II) is functionally involved in human sperm-egg interactions: inhibition of ACE by captopril decreased binding of human spermatozoa to zona-free hamster oocytes. ACE inhibition did not affect capacitation or the acrosome reaction. Angiotensin II (an ACE product) dose-dependently induced the acrosome reaction via calcium-dependent, protein kinase-mediated signaling through a type 2 angiotensin II receptor on sperm heads.","method":"Sperm-egg binding assay with captopril (ACE inhibitor), acrosome reaction assay with angiotensin I/II, pertussis toxin treatment, type 1 and type 2 receptor-specific antagonists, calcium dependency assays","journal":"Andrologia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with receptor-specific antagonists and defined functional readouts; single lab, multiple orthogonal methods","pmids":["9739417"],"is_preprint":false},{"year":1999,"finding":"In normal adult testes, testicular ACE isoform (tACE) is expressed only in spermatids and spermatozoa but not in spermatogonia or spermatocytes. By contrast, somatic ACE (sACE) mRNA and protein are expressed in fetal germ cells and in intratubular germ cell neoplasms and seminomas, indicating isoform-specific and developmental-stage-specific regulation of ACE expression in germ cells.","method":"RT-PCR on laser-assisted cell-picked germ cells, immunohistochemistry with isoform-specific monoclonal antibodies on normal testes, fetal tissues, and 22 testicular tumor specimens","journal":"Laboratory investigation; a journal of technical methods and pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific molecular and protein analysis on precisely isolated cell populations; single lab with two orthogonal methods","pmids":["10576213"],"is_preprint":false},{"year":2016,"finding":"ACE inhibitor captopril extends C. elegans lifespan via inhibition of the ACE homolog acn-1. Reducing acn-1 activity extended lifespan and delayed age-related degeneration. The lifespan extension required daf-16 but was additive with caloric restriction, mitochondrial insufficiency, and daf-2/age-1 mutations, placing acn-1 in a distinct longevity pathway.","method":"C. elegans lifespan assays with captopril, acn-1 RNAi/genetic reduction, double-mutant epistasis with daf-16, daf-2, age-1, sir-2.1, hsf-1, rict-1, caloric restriction, and mitochondrial insufficiency mutants","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple pathway mutants in C. elegans ortholog; single lab with systematic epistasis panel","pmids":["26918946"],"is_preprint":false},{"year":2009,"finding":"ACE inhibitor treatment upregulates ACE2 expression and Mas receptor mRNA in both CCl4-injured rat liver in vivo and angiotensin II-treated hepatic stellate cells in vitro. ACE inhibitor-mediated suppression of angiotensin II-induced connective tissue growth factor (CTGF) expression was ameliorated by Mas receptor blockade with A779, indicating that ACE inhibitors act partly through upregulation of the ACE2-Ang(1-7)-Mas axis.","method":"In vivo rat CCl4 liver fibrosis model with perindopril treatment (immunohistochemistry, western blot, RT-PCR); in vitro hepatic stellate cell treatment with AngII ± ACE inhibitor ± Mas antagonist A779; CTGF western blot","journal":"Clinical and experimental pharmacology & physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro convergent evidence with pathway dissection using Mas antagonist; single lab, multiple orthogonal methods","pmids":["19793108"],"is_preprint":false},{"year":2022,"finding":"In normal aging human brain, ACE-1 protein levels and angiotensin II correlate positively with age, while ACE-1 enzyme activity is inversely related to age. In early/intermediate Alzheimer's disease (Braak stage III-IV), ACE-1 enzyme activity is elevated in the temporal cortex independently of normal age-related changes in ACE-1 protein.","method":"Fluorogenic peptide activity assays for ACE-1 and ACE-2, ELISA for ACE-1, ACE-2 protein and Ang-II, in post-mortem brain tissue from normal aging cohort (n=121) and AD cohort (n=60) stratified by Braak stage","journal":"The journals of gerontology. Series A, Biological sciences and medical sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlative activity/protein measurements in post-mortem tissue; single lab, no mechanistic intervention","pmids":["35396835"],"is_preprint":false}],"current_model":"ACE (angiotensin-converting enzyme/CD143) is an integral membrane-bound dipeptidyl carboxypeptidase that exists as two mammalian isoforms — a double-domain somatic form central to the renin-angiotensin and kinin systems, and a single-domain testicular form required for male fertility — whose catalytic activity converts angiotensin I to angiotensin II and degrades bradykinin, but which also exerts non-catalytic functions including direct activation of the bradykinin B1 receptor, modulation of macrophage polarization via AMPK-dependent intracellular signaling, and regulation of hematopoietic stem cell expansion through angiotensin receptor signaling; ACE shedding from the endothelial surface is regulated by its conformation, which is influenced by binding of lysozyme and bilirubin, as well as by the N-domain residues controlling dimerization, and ACE activity is further modulated by heterodimerization with the bradykinin B2 receptor."},"narrative":{"mechanistic_narrative":"ACE (angiotensin-converting enzyme/CD143) is a membrane-bound dipeptidyl carboxypeptidase central to the renin-angiotensin and kinin systems, present as two mammalian isoforms with distinct biological roles: a double-domain somatic form whose two catalytic domains have different substrate affinities, and a single-domain germinal (testicular) form required for male fertility [PMID:12676162]. The two isoforms are developmentally and cell-type specifically regulated in germ cells, with testicular ACE confined to spermatids and spermatozoa and somatic ACE appearing in fetal germ cells and germ cell neoplasms [PMID:10576213]; in sperm, ACE activity supports sperm-egg binding while its product angiotensin II drives the acrosome reaction through a type 2 angiotensin receptor [PMID:9739417]. Beyond classical peptidase function, ACE participates in cell-fate and immune processes: its enzymatic activity and downstream AGTR1/AGTR2 signaling regulate hemangioblast expansion and endothelial-versus-hematopoietic lineage choice [PMID:18728246], and it shapes myeloid biology, suppressing pro-inflammatory cytokine output through a non-catalytic, AMPK-dependent intracellular signaling role [PMID:21116821] while myeloid ACE overexpression reduces atherosclerotic plaque burden [PMID:31615657]. ACE also exerts catalysis-independent effects, directly activating the bradykinin B1 receptor at its zinc-binding HEXXH motif when bound by nanomolar ACE inhibitors, elevating intracellular calcium and releasing NO [PMID:12489793], and its catalytic activity is augmented by heterodimerization with the bradykinin B2 receptor [PMID:18212275]. Surface ACE shedding is governed by conformation, controlled by N-domain residues that regulate dimerization and by binding of lysozyme and bilirubin, such that an N-domain mutation disrupting lysozyme binding sharply elevates circulating ACE activity [PMID:27734897, PMID:20003136]. ACE expression across the human vascular tree is markedly heterogeneous, being intense in lung capillaries and small muscular arteries but low in large vessels and most renal vasculature [PMID:21167844], and renal ACE is reciprocally regulated against ACE2 in diabetes [PMID:15078862].","teleology":[{"year":1998,"claim":"Established that ACE function is not confined to systemic blood pressure control but operates directly in fertilization, linking the enzyme's product angiotensin II to sperm activation.","evidence":"Sperm-egg binding and acrosome reaction assays with captopril, angiotensin I/II, and receptor-specific antagonists","pmids":["9739417"],"confidence":"Medium","gaps":["Does not identify which ACE isoform mediates sperm-egg binding","Mechanism by which ACE inhibition reduces binding without affecting capacitation unresolved"]},{"year":1999,"claim":"Resolved that ACE isoform expression in germ cells is developmental-stage specific, distinguishing testicular ACE in mature germ cells from somatic ACE in fetal and neoplastic germ cells.","evidence":"RT-PCR on laser-picked germ cells and isoform-specific immunohistochemistry on normal testes, fetal tissue, and testicular tumors","pmids":["10576213"],"confidence":"Medium","gaps":["Functional consequence of somatic ACE re-expression in neoplasia not tested","Regulatory switch controlling isoform usage unknown"]},{"year":2002,"claim":"Demonstrated a catalysis-independent action of ACE inhibitors, showing they directly activate the bradykinin B1 receptor at a defined zinc-binding motif, revealing signaling effects distinct from peptidase inhibition.","evidence":"Calcium and NO assays with site-directed mutagenesis (H195A), peptide competition, and B1 antagonist","pmids":["12489793"],"confidence":"High","gaps":["Physiological relevance of inhibitor-induced B1 activation in vivo not established","Whether endogenous ACE participates in this receptor activation unclear"]},{"year":2003,"claim":"Defined the two-isoform architecture of mammalian ACE and assigned distinct in vivo roles to the somatic and germinal forms and to the two somatic catalytic domains.","evidence":"Mouse knockouts, comparative biochemistry with invertebrate homologues, and domain-specific substrate assays","pmids":["12676162"],"confidence":"High","gaps":["Full repertoire of physiological substrates for each domain not catalogued","Structural basis of domain substrate-affinity differences not detailed here"]},{"year":2004,"claim":"Showed reciprocal regulation of ACE and ACE2 in diabetic kidney, indicating tissue-specific remodeling of the renin-angiotensin axis under metabolic disease.","evidence":"Western blot, immunohistochemistry, activity assay, and RT-PCR in db/db versus control mouse kidney and heart","pmids":["15078862"],"confidence":"Medium","gaps":["Causal driver of the reciprocal ACE/ACE2 shift not identified","Tissue specificity (kidney vs heart) mechanism unexplained"]},{"year":2008,"claim":"Identified an enzymatic requirement for ACE in hematopoietic/endothelial cell-fate decisions, placing the renin-angiotensin system upstream of hemangioblast lineage commitment.","evidence":"Human embryonic stem cell differentiation with ACE inhibitor and AGTR1/AGTR2 antagonists, flow cytometry","pmids":["18728246"],"confidence":"Medium","gaps":["Identity of the ACE substrate driving the effect not pinned down","In vivo developmental relevance not tested"]},{"year":2008,"claim":"Revealed a non-catalytic intracellular signaling role for ACE in macrophage polarization, decoupling its immune-modulatory function from peptidase activity.","evidence":"siRNA knockdown, overexpression in THP-1, ACE inhibitor as negative control, AMPKα1 knockout macrophages, cytokine measurement","pmids":["21116821"],"confidence":"Medium","gaps":["Direct intracellular partners transducing the signal not identified","Link between AMPK phosphorylation and ACE-dependent cytokine suppression incompletely mapped"]},{"year":2008,"claim":"Established that ACE catalytic output is modulated by physical heterodimerization with the bradykinin B2 receptor, demonstrating receptor crosstalk regulating enzyme activity.","evidence":"CHO coexpression with FRET activity assay, icatibant blockade, and B2 receptor knockout mouse endothelial cells","pmids":["18212275"],"confidence":"Medium","gaps":["Structural interface of the ACE-B2 heterodimer not defined","Whether dimerization alters substrate selectivity unknown"]},{"year":2009,"claim":"Mapped an N-domain region controlling ACE dimerization and shedding, mechanistically linking quaternary structure to release of soluble ACE.","evidence":"Site-directed mutagenesis (Q18H, L19E, Q22A) in CHO cells, mAb epitope mapping, cross-linking, flow cytometry","pmids":["20003136"],"confidence":"Medium","gaps":["Identity of the sheddase acting on ACE not addressed","Physiological signals controlling dimerization in vivo unknown"]},{"year":2009,"claim":"Connected ACE inhibition to activation of the counter-regulatory ACE2-Ang(1-7)-Mas axis, showing part of the inhibitor's anti-fibrotic effect is mediated through Mas signaling.","evidence":"Rat CCl4 liver fibrosis model and AngII-treated hepatic stellate cells with perindopril and Mas antagonist A779","pmids":["19793108"],"confidence":"Medium","gaps":["Direct effect of ACE on the Mas axis versus indirect substrate-level effect not separated","Generality beyond liver fibrosis not tested"]},{"year":2010,"claim":"Showed ACE and ACE2 engage integrins RGD-independently and can serve as adhesion substrates, extending ACE function into cell adhesion and integrin signaling.","evidence":"Co-IP with integrin subunits, adhesion assays, FAK phosphorylation and Akt western blot","pmids":["22523556"],"confidence":"Medium","gaps":["Single Co-IP without mutagenesis to map the interaction interface","Functional adhesion role demonstrated mainly for ACE2 rather than ACE"]},{"year":2010,"claim":"Documented the heterogeneous, organ- and vessel-specific distribution of endothelial ACE across the human vascular tree, establishing where ACE-dependent peptide processing predominates.","evidence":"Systematic immunohistochemistry of the complete human vascular tree with a monoclonal antibody panel","pmids":["21167844"],"confidence":"Medium","gaps":["Functional consequence of vascular-bed-specific ACE levels not tested","Regulatory basis of the expression heterogeneity unknown"]},{"year":2016,"claim":"Identified lysozyme and bilirubin as conformational regulators of ACE controlling its shedding, with a natural N-domain mutation sharply raising blood ACE activity.","evidence":"Natural ACE mutation (Arg532Trp) characterization, binding identification, conformational mAb fingerprinting, electron microscopy","pmids":["27734897"],"confidence":"Medium","gaps":["Quantitative contribution of conformational regulation to physiological ACE shedding unclear","Structural details of lysozyme/bilirubin binding sites not fully resolved"]},{"year":2016,"claim":"Used the C. elegans ACE ortholog acn-1 to place ACE-family activity in a longevity pathway, showing its reduction extends lifespan dependent on daf-16 but distinct from known longevity axes.","evidence":"C. elegans lifespan assays with captopril and acn-1 reduction plus systematic epistasis with daf-16, daf-2, age-1, and other mutants","pmids":["26918946"],"confidence":"Medium","gaps":["Relevance to mammalian ACE longevity effects not established","Molecular substrate of acn-1 in aging unknown"]},{"year":2019,"claim":"Demonstrated through cell-type-specific genetics that myeloid ACE overexpression paradoxically reduces atherosclerosis, defining a protective immune role for ACE in plaque biology.","evidence":"ACE10 transgenic myeloid-overexpression mouse crossed to ApoE-/-, atherogenic diet, bone marrow transplantation, plaque quantification","pmids":["31615657"],"confidence":"Medium","gaps":["Whether the protective effect is catalytic or non-catalytic not resolved","Human relevance of myeloid ACE overexpression untested"]},{"year":2022,"claim":"Dissected a radiation-responsive ACE pathway in myeloid cells, linking ACE activation to NADPH oxidase 2- and AT1 receptor-dependent ROS and tissue inflammation.","evidence":"Irradiated human monocytes/THP-1 with ACE activity, ROS, NOX2 and AT1 inhibitor assays plus rat partial-body irradiation with lisinopril","pmids":["35093482"],"confidence":"Medium","gaps":["Mechanism by which radiation activates ACE not defined","Reconciliation with protective myeloid ACE roles unresolved"]},{"year":2022,"claim":"Correlated ACE-1 protein, activity, and angiotensin II with normal brain aging and early Alzheimer's disease, raising the question of an ACE role in neurodegeneration.","evidence":"Fluorogenic activity assays and ELISA in post-mortem normal-aging (n=121) and AD (n=60) brain cohorts","pmids":["35396835"],"confidence":"Low","gaps":["Correlative post-mortem data with no mechanistic intervention","Causal direction between ACE changes and AD pathology unknown"]},{"year":null,"claim":"It remains unresolved how ACE's catalytic and non-catalytic functions are integrated and reconciled across contexts where it appears both pro-inflammatory and protective, and what the direct intracellular partners of its signaling role are.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified intracellular signaling effectors downstream of non-catalytic ACE","Catalytic versus non-catalytic basis of myeloid phenotypes not separated","No structural model of ACE-receptor heterodimers"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,7,16]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,6,11]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,3,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,9,10]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[12,13]}],"complexes":[],"partners":["BDKRB2","BDKRB1","ACE2","AGTR1","AGTR2","LYZ"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P12821","full_name":"Angiotensin-converting enzyme","aliases":["Dipeptidyl carboxypeptidase I","Kininase II"],"length_aa":1306,"mass_kda":149.7,"function":"Dipeptidyl carboxypeptidase that removes dipeptides from the C-terminus of a variety of circulating hormones, such as angiotensin I, bradykinin or enkephalins, thereby playing a key role in the regulation of blood pressure, electrolyte homeostasis or synaptic plasticity (PubMed:15615692, PubMed:20826823, PubMed:2558109, PubMed:4322742, PubMed:7523412, PubMed:7683654). Composed of two similar catalytic domains, each possessing a functional active site, with different selectivity for substrates (PubMed:10913258, PubMed:1320019, PubMed:1851160, PubMed:19773553, PubMed:7683654, PubMed:7876104). Plays a major role in the angiotensin-renin system that regulates blood pressure and sodium retention by the kidney by converting angiotensin I to angiotensin II, resulting in an increase of the vasoconstrictor activity of angiotensin (PubMed:11432860, PubMed:1851160, PubMed:19773553, PubMed:23056909, PubMed:4322742). Also able to inactivate bradykinin, a potent vasodilator, and therefore enhance the blood pressure response (PubMed:15615692, PubMed:2558109, PubMed:4322742, PubMed:6055465, PubMed:6270633, PubMed:7683654). Acts as a regulator of synaptic transmission by mediating cleavage of neuropeptide hormones, such as substance P, neurotensin or enkephalins (PubMed:15615692, PubMed:6208535, PubMed:6270633, PubMed:656131). Catalyzes degradation of different enkephalin neuropeptides (Met-enkephalin, Leu-enkephalin, Met-enkephalin-Arg-Phe and possibly Met-enkephalin-Arg-Gly-Leu) (PubMed:2982830, PubMed:6270633, PubMed:656131). Acts as a regulator of synaptic plasticity in the nucleus accumbens of the brain by mediating cleavage of Met-enkephalin-Arg-Phe, a strong ligand of Mu-type opioid receptor OPRM1, into Met-enkephalin (By similarity). Met-enkephalin-Arg-Phe cleavage by ACE decreases activation of OPRM1, leading to long-term synaptic potentiation of glutamate release (By similarity). Also acts as a regulator of hematopoietic stem cell differentiation by mediating degradation of hemoregulatory peptide N-acetyl-SDKP (AcSDKP) (PubMed:26403559, PubMed:7876104, PubMed:8257427, PubMed:8609242). Acts as a regulator of cannabinoid signaling pathway by mediating degradation of hemopressin, an antagonist peptide of the cannabinoid receptor CNR1 (PubMed:18077343). Involved in amyloid-beta metabolism by catalyzing degradation of Amyloid-beta protein 40 and Amyloid-beta protein 42 peptides, thereby preventing plaque formation (PubMed:11604391, PubMed:16154999, PubMed:19773553). Catalyzes cleavage of cholecystokinin (maturation of Cholecystokinin-8 and Cholecystokinin-5) and Gonadoliberin-1 (both maturation and degradation) hormones (PubMed:10336644, PubMed:2983326, PubMed:7683654, PubMed:9371719). Degradation of hemoregulatory peptide N-acetyl-SDKP (AcSDKP) and amyloid-beta proteins is mediated by the N-terminal catalytic domain, while angiotensin I and cholecystokinin cleavage is mediated by the C-terminal catalytic region (PubMed:10336644, PubMed:19773553, PubMed:7876104) Soluble form that is released in blood plasma and other body fluids following proteolytic cleavage in the juxtamembrane stalk region Isoform produced by alternative promoter usage that is specifically expressed in spermatocytes and adult testis, and which is required for male fertility (PubMed:1651327, PubMed:1668266). In contrast to somatic isoforms, only contains one catalytic domain (PubMed:1651327, PubMed:1668266). Acts as a dipeptidyl carboxypeptidase that removes dipeptides from the C-terminus of substrates (PubMed:1668266, PubMed:24297181). The identity of substrates that are needed for male fertility is unknown (By similarity). May also have a glycosidase activity which releases GPI-anchored proteins from the membrane by cleaving the mannose linkage in the GPI moiety. The GPIase activity was reported to be essential for the egg-binding ability of the sperm (By similarity). This activity is however unclear and has been challenged by other groups, suggesting that it may be indirect (By similarity)","subcellular_location":"Cell membrane; Secreted","url":"https://www.uniprot.org/uniprotkb/P12821/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ACE","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ACE","total_profiled":1310},"omim":[{"mim_id":"621420","title":"ANGIOTENSIN I-CONVERTING ENZYME, PLASMA LEVEL OF","url":"https://www.omim.org/entry/621420"},{"mim_id":"621314","title":"POMPE DISEASE, LATE-ONSET; LOPD","url":"https://www.omim.org/entry/621314"},{"mim_id":"619363","title":"ANGIOEDEMA, HEREDITARY, 6; 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Angiotensin-converting-enzyme (ACE).","date":"1989","source":"Clinics in laboratory medicine","url":"https://pubmed.ncbi.nlm.nih.gov/2556234","citation_count":23,"is_preprint":false},{"pmid":"12148094","id":"PMC_12148094","title":"ACE genotype and ACE inhibitor response in kidney disease: a perspective.","date":"2002","source":"American journal of kidney diseases : the official journal of the National Kidney Foundation","url":"https://pubmed.ncbi.nlm.nih.gov/12148094","citation_count":22,"is_preprint":false},{"pmid":"22489048","id":"PMC_22489048","title":"Extensive Ace2 duplication and multiple mutations on Ace1 and Ace2 are related with high level of organophosphates resistance in Aphis gossypii.","date":"2012","source":"Environmental toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/22489048","citation_count":22,"is_preprint":false},{"pmid":"35396835","id":"PMC_35396835","title":"Dysregulation of ACE-1 in Normal Aging and the Early Stages of Alzheimer's Disease.","date":"2022","source":"The journals of gerontology. Series A, Biological sciences and medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35396835","citation_count":22,"is_preprint":false},{"pmid":"15835380","id":"PMC_15835380","title":"ACE inhibitors and chronotherapy.","date":"2005","source":"Clinical and experimental hypertension (New York, N.Y. : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/15835380","citation_count":21,"is_preprint":false},{"pmid":"17550823","id":"PMC_17550823","title":"Molecular cloning and characterization of the complete acetylcholinesterase gene (Ace1) from the mosquito Aedes aegypti with implications for comparative genome analysis.","date":"2007","source":"Insect biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17550823","citation_count":20,"is_preprint":false},{"pmid":"35245599","id":"PMC_35245599","title":"Role and Interaction Between ACE1, ACE2 and Their Related Genes in Cardiovascular Disorders.","date":"2022","source":"Current problems in cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/35245599","citation_count":19,"is_preprint":false},{"pmid":"34774774","id":"PMC_34774774","title":"Assessment of ACE1 variants and ACE1/ACE2 expression in COVID-19 patients.","date":"2021","source":"Vascular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/34774774","citation_count":18,"is_preprint":false},{"pmid":"9010883","id":"PMC_9010883","title":"ACE inhibitors and proteinuria.","date":"1996","source":"Pharmacy world & science : PWS","url":"https://pubmed.ncbi.nlm.nih.gov/9010883","citation_count":18,"is_preprint":false},{"pmid":"33089502","id":"PMC_33089502","title":"Renin inhibitors versus angiotensin converting enzyme (ACE) inhibitors for primary hypertension.","date":"2020","source":"The Cochrane database of systematic reviews","url":"https://pubmed.ncbi.nlm.nih.gov/33089502","citation_count":18,"is_preprint":false},{"pmid":"31615657","id":"PMC_31615657","title":"Overexpression of myeloid angiotensin-converting enzyme (ACE) reduces atherosclerosis.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/31615657","citation_count":18,"is_preprint":false},{"pmid":"2193808","id":"PMC_2193808","title":"Haemodynamic effects of ACE inhibitors.","date":"1990","source":"European heart journal","url":"https://pubmed.ncbi.nlm.nih.gov/2193808","citation_count":17,"is_preprint":false},{"pmid":"7512474","id":"PMC_7512474","title":"Nephroprotective effect of ACE inhibitors.","date":"1993","source":"Drugs","url":"https://pubmed.ncbi.nlm.nih.gov/7512474","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48500,"output_tokens":4979,"usd":0.110092,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12928,"output_tokens":5220,"usd":0.09757,"stage2_stop_reason":"end_turn"},"total_usd":0.207662,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about the canonical ACE gene (angiotensin-converting enzyme, also known as ACE1/CD143/DCP1 as HGNC aliases).\n\n**Important disambiguation**: The HGNC aliases listed include \"DCP1\" — but this refers to ACE's alias (dipeptidyl carboxypeptidase 1), NOT the mRNA decapping enzyme DCP1. Papers [1], [2], [5], [10], [12], [15], [17], [22], [34], [42], [49], [51], [53], [57], [63] are about the mRNA decapping enzyme DCP1/DCP2 complex — a completely different protein. These must be excluded.\n\nPapers [4], [27], [44], [47], [56], [60] describe yeast ACE1 (a copper-responsive transcription factor) — this is a symbol collision, not an ortholog of human ACE (angiotensin-converting enzyme). These should be excluded.\n\nPapers [33], [37] describe Magnaporthe ACE1 — fungal, exclude.\nPapers [90], [93] describe insect Ace1 (acetylcholinesterase) — exclude.\n\nNow extracting from relevant ACE papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"ACE exists as two isoforms in mammals: a single-domain germinal (testicular) isoform required for male fertility, and a double-domain somatic isoform with a key role in the renin-angiotensin system. Both somatic domains are catalytically active but have different substrate affinities. Mouse knockout experiments demonstrated these two domains have clearly distinct biological roles.\",\n      \"method\": \"Mouse knockout experiments, comparative biochemistry with invertebrate homologues, enzymatic substrate assays\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse knockout with defined phenotypes, replicated across labs, domain-specific activity assays with multiple orthogonal approaches\",\n      \"pmids\": [\"12676162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ACE (CD143) enzymatic activity is required for hemangioblast expansion from human embryonic stem cells, and ACE/renin-angiotensin system signaling through AGTR1 and AGTR2 receptors directly regulates hemangioblast differentiation toward endothelial or hematopoietic lineages.\",\n      \"method\": \"Human embryonic stem cell differentiation assays, ACE inhibitor treatment, AGTR1/AGTR2-specific inhibitors, flow cytometry for ACE+CD45-CD34+/- hemangioblasts\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional inhibitor studies with defined cellular phenotype, single lab, multiple orthogonal approaches (enzymatic inhibition + receptor-specific antagonists)\",\n      \"pmids\": [\"18728246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ACE modulates macrophage polarization independently of its enzymatic activity: overexpression of ACE in macrophages reduced pro-inflammatory cytokine production (TNF-α, IL-6, MCP-1), and this effect was insensitive to ACE inhibition but sensitive to ACE siRNA knockdown, indicating a non-catalytic intracellular signaling role. Adipocyte-derived lipids upregulate ACE expression via AMPK phosphorylation.\",\n      \"method\": \"siRNA knockdown of ACE, ACE overexpression in THP-1 cells, ACE inhibitor treatment (negative control), AMPK inhibition, AMPKα1 knockout mouse macrophages, cytokine measurements\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown, overexpression, KO mouse cells, and pharmacological inhibition as negative control; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21116821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ACE activity is modulated by its heterodimerization with the bradykinin B2 receptor: coexpression of the kinin B2 receptor with somatic ACE in CHO cells augmented ACE catalytic activity, and this effect was blocked by the B2 receptor antagonist icatibant. Endothelial cells from kinin B2 receptor knockout mice showed decreased ACE activity.\",\n      \"method\": \"Coexpression in CHO cells with FRET-based enzymatic activity assay, B2 receptor antagonist icatibant, kinin B2 receptor knockout mouse endothelial cells\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based coexpression with pharmacological blockade and confirmed in knockout mouse cells; single lab, two complementary systems\",\n      \"pmids\": [\"18212275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ACE inhibitors at nanomolar concentrations directly activate the bradykinin B1 receptor at its Zn-binding HEXXH motif (residues 195-199) independently of ACE enzymatic activity and without peptide ligands, elevating intracellular calcium and releasing NO. Site-directed mutagenesis of H195 to alanine abolished ACE inhibitor-induced B1 receptor activation but not peptide ligand activation.\",\n      \"method\": \"Cell-based calcium assay, NO measurement, site-directed mutagenesis (H195A), synthetic peptide competition, B1 receptor antagonist\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-directed mutagenesis combined with pharmacological and peptide competition experiments identifying specific mechanism; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12489793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Lysozyme (a blood protein) and bilirubin (a low-molecular-weight effector) bind to ACE and regulate its conformation and shedding from endothelial cell surfaces. An ACE mutation (Arg532Trp in the N domain) that disrupts the lysozyme binding site increases blood ACE activity 7-fold by increasing shedding.\",\n      \"method\": \"Novel ACE gene mutation characterization, protein binding identification, conformational analysis using monoclonal antibody panel (ACE phenotyping), electron microscopy\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — natural mutation with defined phenotype, binding partner identification, conformational fingerprinting; single lab with multiple methods\",\n      \"pmids\": [\"27734897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Fine epitope mapping of anti-ACE monoclonal antibodies 9B9 and 3G8 identified that a region in the N-terminal N domain (involving residues Q18, L19, Q22) regulates ACE dimerization and shedding. Point mutations Q18H, L19E, and Q22A in full-length somatic ACE increased cell-surface ACE expression, basal shedding, and the amount of cross-linked ACE dimer.\",\n      \"method\": \"Site-directed mutagenesis (Q18H, L19E, Q22A) of full-length somatic ACE expressed in CHO cells, monoclonal antibody epitope mapping, cross-linking and western blot, flow cytometry\",\n      \"journal\": \"Tissue antigens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with defined functional consequences for shedding and dimerization; single lab with multiple readouts\",\n      \"pmids\": [\"20003136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ACE and ACE2 are co-expressed in renal tubules, with ACE protein markedly reduced and ACE2 protein increased in kidneys of diabetic (db/db) mice compared to controls, accompanied by a corresponding decrease in renal ACE enzymatic activity. This reciprocal pattern was not observed in heart tissue.\",\n      \"method\": \"Western blot, immunohistochemistry, fluorometric ACE activity assay, RT-PCR for mRNA; comparison of db/db diabetic vs db/m control mice\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein quantification, enzyme activity, and localization in matched tissues with controls; single lab, three orthogonal methods\",\n      \"pmids\": [\"15078862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ACE and ACE2 bind integrin subunits in an RGD-independent manner and can act as cell adhesion substrates. Cellular expression of ACE2 enhanced cell adhesion. Soluble ACE2 suppressed integrin signaling mediated by FAK and altered Akt expression levels.\",\n      \"method\": \"Co-immunoprecipitation (Co-IP) of ACE/ACE2 with integrin subunits, cell adhesion assays, FAK phosphorylation measurement, Akt western blot\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP binding and cell-based functional assays; single lab, multiple readouts but no mutagenesis to map interaction\",\n      \"pmids\": [\"22523556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Radiation directly activates ACE within myeloid immune cells, increasing ACE activity and reactive oxygen species (ROS) generation via NADPH oxidase 2 and type 1 angiotensin receptor signaling. ACE inhibition with lisinopril blocked radiation-induced ACE activation and ROS production in human monocytes and reduced lung myeloid cell infiltration in vivo.\",\n      \"method\": \"In vitro radiation of human monocytes/THP-1 cells with ACE activity measurement, ROS assay, NADPH oxidase 2 inhibitor, AT1 receptor inhibitor; rat partial body irradiation model with lisinopril treatment, flow cytometry for lung immune cells, BAL cytokine measurement\",\n      \"journal\": \"International journal of radiation oncology, biology, physics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic pathway dissection with pharmacological inhibitors combined with in vivo model; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"35093482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Myeloid-specific ACE overexpression (ACE10 mouse model) paradoxically reduced atherosclerotic plaque burden in ApoE-deficient mice on an atherogenic diet. Bone marrow transplantation demonstrated this effect was mediated by myeloid-lineage ACE, as ACE10 bone marrow recipients showed significantly reduced lesion areas compared to wild-type bone marrow recipients.\",\n      \"method\": \"ACE10 transgenic mouse model with myeloid-specific ACE overexpression, ApoE-/- cross, atherogenic diet, bone marrow transplantation, plaque quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic gain-of-function with bone marrow transfer to establish cell-type specificity; single lab, defined phenotypic readout\",\n      \"pmids\": [\"31615657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ACE expression in the vascular endothelium is heterogeneous and vessel-, organ-, and species-specific: in humans, small muscular arteries and arterioles display high ACE immunoreactivity while large arteries, veins, and renal vasculature show little or no ACE. In the lung, all capillary endothelial cells are intensely ACE-positive. This pattern was determined by direct immunohistochemistry of the entire human vascular tree.\",\n      \"method\": \"Immunohistochemistry of serial sections from the complete human vascular tree using a panel of monoclonal antibodies, comparison with other endothelial markers\",\n      \"journal\": \"Microvascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic direct localization across the entire vascular tree with antibody panel; single study but comprehensive anatomical coverage\",\n      \"pmids\": [\"21167844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ACE (kininase II) is functionally involved in human sperm-egg interactions: inhibition of ACE by captopril decreased binding of human spermatozoa to zona-free hamster oocytes. ACE inhibition did not affect capacitation or the acrosome reaction. Angiotensin II (an ACE product) dose-dependently induced the acrosome reaction via calcium-dependent, protein kinase-mediated signaling through a type 2 angiotensin II receptor on sperm heads.\",\n      \"method\": \"Sperm-egg binding assay with captopril (ACE inhibitor), acrosome reaction assay with angiotensin I/II, pertussis toxin treatment, type 1 and type 2 receptor-specific antagonists, calcium dependency assays\",\n      \"journal\": \"Andrologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with receptor-specific antagonists and defined functional readouts; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"9739417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In normal adult testes, testicular ACE isoform (tACE) is expressed only in spermatids and spermatozoa but not in spermatogonia or spermatocytes. By contrast, somatic ACE (sACE) mRNA and protein are expressed in fetal germ cells and in intratubular germ cell neoplasms and seminomas, indicating isoform-specific and developmental-stage-specific regulation of ACE expression in germ cells.\",\n      \"method\": \"RT-PCR on laser-assisted cell-picked germ cells, immunohistochemistry with isoform-specific monoclonal antibodies on normal testes, fetal tissues, and 22 testicular tumor specimens\",\n      \"journal\": \"Laboratory investigation; a journal of technical methods and pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific molecular and protein analysis on precisely isolated cell populations; single lab with two orthogonal methods\",\n      \"pmids\": [\"10576213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ACE inhibitor captopril extends C. elegans lifespan via inhibition of the ACE homolog acn-1. Reducing acn-1 activity extended lifespan and delayed age-related degeneration. The lifespan extension required daf-16 but was additive with caloric restriction, mitochondrial insufficiency, and daf-2/age-1 mutations, placing acn-1 in a distinct longevity pathway.\",\n      \"method\": \"C. elegans lifespan assays with captopril, acn-1 RNAi/genetic reduction, double-mutant epistasis with daf-16, daf-2, age-1, sir-2.1, hsf-1, rict-1, caloric restriction, and mitochondrial insufficiency mutants\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple pathway mutants in C. elegans ortholog; single lab with systematic epistasis panel\",\n      \"pmids\": [\"26918946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ACE inhibitor treatment upregulates ACE2 expression and Mas receptor mRNA in both CCl4-injured rat liver in vivo and angiotensin II-treated hepatic stellate cells in vitro. ACE inhibitor-mediated suppression of angiotensin II-induced connective tissue growth factor (CTGF) expression was ameliorated by Mas receptor blockade with A779, indicating that ACE inhibitors act partly through upregulation of the ACE2-Ang(1-7)-Mas axis.\",\n      \"method\": \"In vivo rat CCl4 liver fibrosis model with perindopril treatment (immunohistochemistry, western blot, RT-PCR); in vitro hepatic stellate cell treatment with AngII ± ACE inhibitor ± Mas antagonist A779; CTGF western blot\",\n      \"journal\": \"Clinical and experimental pharmacology & physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro convergent evidence with pathway dissection using Mas antagonist; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19793108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In normal aging human brain, ACE-1 protein levels and angiotensin II correlate positively with age, while ACE-1 enzyme activity is inversely related to age. In early/intermediate Alzheimer's disease (Braak stage III-IV), ACE-1 enzyme activity is elevated in the temporal cortex independently of normal age-related changes in ACE-1 protein.\",\n      \"method\": \"Fluorogenic peptide activity assays for ACE-1 and ACE-2, ELISA for ACE-1, ACE-2 protein and Ang-II, in post-mortem brain tissue from normal aging cohort (n=121) and AD cohort (n=60) stratified by Braak stage\",\n      \"journal\": \"The journals of gerontology. Series A, Biological sciences and medical sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlative activity/protein measurements in post-mortem tissue; single lab, no mechanistic intervention\",\n      \"pmids\": [\"35396835\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ACE (angiotensin-converting enzyme/CD143) is an integral membrane-bound dipeptidyl carboxypeptidase that exists as two mammalian isoforms — a double-domain somatic form central to the renin-angiotensin and kinin systems, and a single-domain testicular form required for male fertility — whose catalytic activity converts angiotensin I to angiotensin II and degrades bradykinin, but which also exerts non-catalytic functions including direct activation of the bradykinin B1 receptor, modulation of macrophage polarization via AMPK-dependent intracellular signaling, and regulation of hematopoietic stem cell expansion through angiotensin receptor signaling; ACE shedding from the endothelial surface is regulated by its conformation, which is influenced by binding of lysozyme and bilirubin, as well as by the N-domain residues controlling dimerization, and ACE activity is further modulated by heterodimerization with the bradykinin B2 receptor.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ACE (angiotensin-converting enzyme/CD143) is a membrane-bound dipeptidyl carboxypeptidase central to the renin-angiotensin and kinin systems, present as two mammalian isoforms with distinct biological roles: a double-domain somatic form whose two catalytic domains have different substrate affinities, and a single-domain germinal (testicular) form required for male fertility [#0]. The two isoforms are developmentally and cell-type specifically regulated in germ cells, with testicular ACE confined to spermatids and spermatozoa and somatic ACE appearing in fetal germ cells and germ cell neoplasms [#13]; in sperm, ACE activity supports sperm-egg binding while its product angiotensin II drives the acrosome reaction through a type 2 angiotensin receptor [#12]. Beyond classical peptidase function, ACE participates in cell-fate and immune processes: its enzymatic activity and downstream AGTR1/AGTR2 signaling regulate hemangioblast expansion and endothelial-versus-hematopoietic lineage choice [#1], and it shapes myeloid biology, suppressing pro-inflammatory cytokine output through a non-catalytic, AMPK-dependent intracellular signaling role [#2] while myeloid ACE overexpression reduces atherosclerotic plaque burden [#10]. ACE also exerts catalysis-independent effects, directly activating the bradykinin B1 receptor at its zinc-binding HEXXH motif when bound by nanomolar ACE inhibitors, elevating intracellular calcium and releasing NO [#4], and its catalytic activity is augmented by heterodimerization with the bradykinin B2 receptor [#3]. Surface ACE shedding is governed by conformation, controlled by N-domain residues that regulate dimerization and by binding of lysozyme and bilirubin, such that an N-domain mutation disrupting lysozyme binding sharply elevates circulating ACE activity [#5, #6]. ACE expression across the human vascular tree is markedly heterogeneous, being intense in lung capillaries and small muscular arteries but low in large vessels and most renal vasculature [#11], and renal ACE is reciprocally regulated against ACE2 in diabetes [#7].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that ACE function is not confined to systemic blood pressure control but operates directly in fertilization, linking the enzyme's product angiotensin II to sperm activation.\",\n      \"evidence\": \"Sperm-egg binding and acrosome reaction assays with captopril, angiotensin I/II, and receptor-specific antagonists\",\n      \"pmids\": [\"9739417\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not identify which ACE isoform mediates sperm-egg binding\", \"Mechanism by which ACE inhibition reduces binding without affecting capacitation unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Resolved that ACE isoform expression in germ cells is developmental-stage specific, distinguishing testicular ACE in mature germ cells from somatic ACE in fetal and neoplastic germ cells.\",\n      \"evidence\": \"RT-PCR on laser-picked germ cells and isoform-specific immunohistochemistry on normal testes, fetal tissue, and testicular tumors\",\n      \"pmids\": [\"10576213\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of somatic ACE re-expression in neoplasia not tested\", \"Regulatory switch controlling isoform usage unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated a catalysis-independent action of ACE inhibitors, showing they directly activate the bradykinin B1 receptor at a defined zinc-binding motif, revealing signaling effects distinct from peptidase inhibition.\",\n      \"evidence\": \"Calcium and NO assays with site-directed mutagenesis (H195A), peptide competition, and B1 antagonist\",\n      \"pmids\": [\"12489793\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of inhibitor-induced B1 activation in vivo not established\", \"Whether endogenous ACE participates in this receptor activation unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the two-isoform architecture of mammalian ACE and assigned distinct in vivo roles to the somatic and germinal forms and to the two somatic catalytic domains.\",\n      \"evidence\": \"Mouse knockouts, comparative biochemistry with invertebrate homologues, and domain-specific substrate assays\",\n      \"pmids\": [\"12676162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of physiological substrates for each domain not catalogued\", \"Structural basis of domain substrate-affinity differences not detailed here\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed reciprocal regulation of ACE and ACE2 in diabetic kidney, indicating tissue-specific remodeling of the renin-angiotensin axis under metabolic disease.\",\n      \"evidence\": \"Western blot, immunohistochemistry, activity assay, and RT-PCR in db/db versus control mouse kidney and heart\",\n      \"pmids\": [\"15078862\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal driver of the reciprocal ACE/ACE2 shift not identified\", \"Tissue specificity (kidney vs heart) mechanism unexplained\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified an enzymatic requirement for ACE in hematopoietic/endothelial cell-fate decisions, placing the renin-angiotensin system upstream of hemangioblast lineage commitment.\",\n      \"evidence\": \"Human embryonic stem cell differentiation with ACE inhibitor and AGTR1/AGTR2 antagonists, flow cytometry\",\n      \"pmids\": [\"18728246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the ACE substrate driving the effect not pinned down\", \"In vivo developmental relevance not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed a non-catalytic intracellular signaling role for ACE in macrophage polarization, decoupling its immune-modulatory function from peptidase activity.\",\n      \"evidence\": \"siRNA knockdown, overexpression in THP-1, ACE inhibitor as negative control, AMPKα1 knockout macrophages, cytokine measurement\",\n      \"pmids\": [\"21116821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct intracellular partners transducing the signal not identified\", \"Link between AMPK phosphorylation and ACE-dependent cytokine suppression incompletely mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that ACE catalytic output is modulated by physical heterodimerization with the bradykinin B2 receptor, demonstrating receptor crosstalk regulating enzyme activity.\",\n      \"evidence\": \"CHO coexpression with FRET activity assay, icatibant blockade, and B2 receptor knockout mouse endothelial cells\",\n      \"pmids\": [\"18212275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural interface of the ACE-B2 heterodimer not defined\", \"Whether dimerization alters substrate selectivity unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapped an N-domain region controlling ACE dimerization and shedding, mechanistically linking quaternary structure to release of soluble ACE.\",\n      \"evidence\": \"Site-directed mutagenesis (Q18H, L19E, Q22A) in CHO cells, mAb epitope mapping, cross-linking, flow cytometry\",\n      \"pmids\": [\"20003136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the sheddase acting on ACE not addressed\", \"Physiological signals controlling dimerization in vivo unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected ACE inhibition to activation of the counter-regulatory ACE2-Ang(1-7)-Mas axis, showing part of the inhibitor's anti-fibrotic effect is mediated through Mas signaling.\",\n      \"evidence\": \"Rat CCl4 liver fibrosis model and AngII-treated hepatic stellate cells with perindopril and Mas antagonist A779\",\n      \"pmids\": [\"19793108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct effect of ACE on the Mas axis versus indirect substrate-level effect not separated\", \"Generality beyond liver fibrosis not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed ACE and ACE2 engage integrins RGD-independently and can serve as adhesion substrates, extending ACE function into cell adhesion and integrin signaling.\",\n      \"evidence\": \"Co-IP with integrin subunits, adhesion assays, FAK phosphorylation and Akt western blot\",\n      \"pmids\": [\"22523556\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without mutagenesis to map the interaction interface\", \"Functional adhesion role demonstrated mainly for ACE2 rather than ACE\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Documented the heterogeneous, organ- and vessel-specific distribution of endothelial ACE across the human vascular tree, establishing where ACE-dependent peptide processing predominates.\",\n      \"evidence\": \"Systematic immunohistochemistry of the complete human vascular tree with a monoclonal antibody panel\",\n      \"pmids\": [\"21167844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of vascular-bed-specific ACE levels not tested\", \"Regulatory basis of the expression heterogeneity unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified lysozyme and bilirubin as conformational regulators of ACE controlling its shedding, with a natural N-domain mutation sharply raising blood ACE activity.\",\n      \"evidence\": \"Natural ACE mutation (Arg532Trp) characterization, binding identification, conformational mAb fingerprinting, electron microscopy\",\n      \"pmids\": [\"27734897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of conformational regulation to physiological ACE shedding unclear\", \"Structural details of lysozyme/bilirubin binding sites not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Used the C. elegans ACE ortholog acn-1 to place ACE-family activity in a longevity pathway, showing its reduction extends lifespan dependent on daf-16 but distinct from known longevity axes.\",\n      \"evidence\": \"C. elegans lifespan assays with captopril and acn-1 reduction plus systematic epistasis with daf-16, daf-2, age-1, and other mutants\",\n      \"pmids\": [\"26918946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevance to mammalian ACE longevity effects not established\", \"Molecular substrate of acn-1 in aging unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated through cell-type-specific genetics that myeloid ACE overexpression paradoxically reduces atherosclerosis, defining a protective immune role for ACE in plaque biology.\",\n      \"evidence\": \"ACE10 transgenic myeloid-overexpression mouse crossed to ApoE-/-, atherogenic diet, bone marrow transplantation, plaque quantification\",\n      \"pmids\": [\"31615657\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the protective effect is catalytic or non-catalytic not resolved\", \"Human relevance of myeloid ACE overexpression untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Dissected a radiation-responsive ACE pathway in myeloid cells, linking ACE activation to NADPH oxidase 2- and AT1 receptor-dependent ROS and tissue inflammation.\",\n      \"evidence\": \"Irradiated human monocytes/THP-1 with ACE activity, ROS, NOX2 and AT1 inhibitor assays plus rat partial-body irradiation with lisinopril\",\n      \"pmids\": [\"35093482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which radiation activates ACE not defined\", \"Reconciliation with protective myeloid ACE roles unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Correlated ACE-1 protein, activity, and angiotensin II with normal brain aging and early Alzheimer's disease, raising the question of an ACE role in neurodegeneration.\",\n      \"evidence\": \"Fluorogenic activity assays and ELISA in post-mortem normal-aging (n=121) and AD (n=60) brain cohorts\",\n      \"pmids\": [\"35396835\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Correlative post-mortem data with no mechanistic intervention\", \"Causal direction between ACE changes and AD pathology unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ACE's catalytic and non-catalytic functions are integrated and reconciled across contexts where it appears both pro-inflammatory and protective, and what the direct intracellular partners of its signaling role are.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identified intracellular signaling effectors downstream of non-catalytic ACE\", \"Catalytic versus non-catalytic basis of myeloid phenotypes not separated\", \"No structural model of ACE-receptor heterodimers\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 7, 16]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 6, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 9, 10]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [12, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BDKRB2\", \"BDKRB1\", \"ACE2\", \"AGTR1\", \"AGTR2\", \"LYZ\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}