{"gene":"MME","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":1997,"finding":"MME/NEP (neutral endopeptidase-24.11) is a type II integral membrane zinc metallopeptidase (M13 family) that hydrolyzes a wide range of biologically active peptide substrates at the cell surface, including enkephalins and atrial natriuretic peptides, functioning as a thermolysin-like endopeptidase to terminate peptide signaling.","method":"Biochemical characterization, structural homology analysis, substrate hydrolysis assays, inhibitor studies (phosphoramidon)","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biochemical methods, replicated across labs, foundational review synthesizing extensive experimental literature","pmids":["9141502","11223883"],"is_preprint":false},{"year":2001,"finding":"NEP degrades both Aβ(1-40) and Aβ(1-42) in vitro and in vivo, and this catabolism is blocked by NEP-specific inhibitors (thiorphan, phosphoramidon), establishing NEP as a key amyloid-degrading enzyme.","method":"In vitro peptide cleavage assays, in vivo animal studies with NEP inhibitors, enzyme inhibitor studies","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution plus in vivo validation, replicated across labs","pmids":["12067222"],"is_preprint":false},{"year":2004,"finding":"Truncating mutations (nonsense and frameshift) in the MME gene result in absence of NEP protein on granulocytes and podocytes, leading to maternal alloimmunization against fetal NEP antigen on glomerular podocytes and antenatal membranous glomerulonephritis; IgG subclass analysis confirmed anti-NEP activity.","method":"Direct sequencing of genomic PCR products, SNP analysis, Western blotting for IgG subclasses with anti-NEP activity","journal":"Lancet","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (sequencing, SNP haplotyping, Western blot), replicated in multiple families","pmids":["15464186"],"is_preprint":false},{"year":1992,"finding":"Jurkat T cells express a functional NEP/CD10 endopeptidase activity (CALLA-related) that cleaves the substrate Suc-Ala-Ala-Phe-pNA; this activity is inhibited by specific endopeptidase 24.11 inhibitors and immunoprecipitated by anti-CD10 monoclonal antibodies, demonstrating that T lymphocytes express functional NEP involved in T cell activation.","method":"Enzymatic substrate hydrolysis assays with specific inhibitors, anti-CD10 immunoprecipitation, HPLC analysis of cleavage products, FACS, mRNA analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — reconstitution-level enzymatic assays with inhibitor validation and immunoprecipitation confirmation","pmids":["1396581"],"is_preprint":false},{"year":1997,"finding":"The enzymatic activity of CD10/NEP is required for PMA-induced growth arrest in Jurkat T cells; transfection of an enzymatically inactive form of CD10 into CD10-deficient PMA-resistant clones failed to restore growth arrest, whereas transfection of functional CD10 rescued this phenotype.","method":"Transfection of wild-type vs. catalytically inactive CD10 into mutant Jurkat clones, proliferation assays, DNA fragmentation assays","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 — functional rescue with active-site mutant versus wild-type, clean genetic epistasis","pmids":["9285485"],"is_preprint":false},{"year":1994,"finding":"CD10/NEP modulates peptide-mediated proliferation in non-small cell lung carcinomas; cells with low CD10/NEP expression grew more rapidly when CD10/NEP was inhibited, and CD10/NEP expression was inversely correlated with PCNA-positive (actively dividing) cells, demonstrating that CD10/NEP suppresses peptide-driven proliferation by degrading mitogenic peptide substrates.","method":"CD10/NEP immunostaining, PCNA staining, cell growth inhibition assays with CD10/NEP inhibitors, receptor expression analysis","journal":"Journal of Clinical Investigation","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods (IHC, growth assays, inhibitor treatment) in one lab","pmids":["7962523"],"is_preprint":false},{"year":2013,"finding":"Tetraspanin CD9 selectively associates with MME/CD10 at the cell surface; the large extracellular loop (CCG motif to TM4) and C-terminal tail of CD9 mediate this interaction; CD9 co-expression enhances CD10 release on exosomes ~5-fold without altering its enzymatic activity, redistributing NEP peptidase activity from the cell surface to extracellular microenvironments.","method":"Co-immunoprecipitation, chimera construction, site-directed mutagenesis of CD9, shRNA knockdown of CD9, exosome isolation, fluorometric peptidase activity assay","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including mutagenesis, knockdown, and functional enzyme assays in one study","pmids":["23289620"],"is_preprint":false},{"year":2010,"finding":"MME/CD10 protease activity (and beta1-integrin adhesion) are required to prevent differentiation of mammary progenitor/stem cells; CD10-high/EpCAM-low cells are enriched for early common progenitors and mammosphere-forming cells; inhibition of CD10 enzymatic activity promotes differentiation, demonstrating that CD10-mediated cleavage of signaling peptides maintains the mammary stem cell niche.","method":"FACS sorting for CD10/EpCAM, sphere formation assays, CD10 enzymatic inhibition studies, lineage progression in vitro assay","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 — clean functional assays with enzymatic inhibition, single lab with multiple methods","pmids":["20506111"],"is_preprint":false},{"year":2016,"finding":"Rare heterozygous loss-of-function and missense mutations in MME result in strongly decreased tissue availability of neprilysin protein and impaired enzymatic activity, causing late-onset autosomal-dominant axonal polyneuropathies (CMT2); mutations segregate with age-related incomplete penetrance.","method":"Whole-exome sequencing, Sanger sequencing, nerve pathology, tissue neprilysin activity assays, protein level quantification","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — enzymatic activity assays plus protein quantification in patient tissue, replicated across 19 index cases","pmids":["27588448"],"is_preprint":false},{"year":2010,"finding":"A nonsynonymous MME variant (Val73 allozyme) displays a significant reduction in enzyme activity (21% of wild-type) and immunoreactive protein (29% of wild-type); this variant undergoes proteasome-mediated degradation and autophagy, with upregulation of chaperones BiP and GRP94 suggesting protein misfolding, consistent with the MME X-ray crystal structure.","method":"Resequencing, expression constructs in COS-1 cells, quantitative Western blot, one-step fluorometric enzyme assay, inhibitor studies for proteasome/autophagy pathways, chaperone upregulation analysis","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in cell expression system with enzyme activity assay and mechanistic degradation pathway characterization","pmids":["20692264"],"is_preprint":false},{"year":2019,"finding":"MME suppresses metastasis of esophageal squamous cell carcinoma by inhibiting phosphorylation of FAK and disrupting the FAK-RhoA signaling axis; MME overexpression also interrupts tumor cell adhesion, demonstrating a mechanistic role for MME in cell movement regulation beyond peptide catabolism.","method":"MME overexpression/knockdown in ESCC cells, in vitro migration and invasion assays, in vivo xenograft models, Western blot for FAK phosphorylation and RhoA activity, cell adhesion assays","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays with defined signaling pathway readouts, single lab","pmids":["31054987"],"is_preprint":false},{"year":2019,"finding":"NEP (neprilysin) is present on syncytiotrophoblast-derived extracellular vesicles (microvesicles and exosomes) in enzymatically active form; NEP activity on these vesicles is inhibited by the specific inhibitor thiorphan, and vesicle-bound NEP levels are significantly elevated in preeclampsia, indicating that circulating placenta-derived vesicles carry active NEP into the maternal circulation.","method":"Immunostaining, Western blotting, antibody-coated magnetic bead isolation, flow cytometry, size-exclusion chromatography, fluorometric NEP activity assay with thiorphan inhibition","journal":"Hypertension","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods confirming active NEP on extracellular vesicles with specific inhibitor validation","pmids":["30929513"],"is_preprint":false},{"year":2005,"finding":"NEP (neutral endopeptidase) degrades CGRP in human skin; inhibition of NEP with phosphoramidon increased neurogenic flare intensity and size and enabled CGRP detection in microdialysis samples, establishing NEP as the major enzyme responsible for CGRP degradation in neurogenic inflammation.","method":"Intracutaneous microdialysis with specific inhibitors (phosphoramidon for NEP, captopril for ACE), laser Doppler imaging, CGRP EIA","journal":"Experimental neurology","confidence":"High","confidence_rationale":"Tier 1 — in vivo pharmacological inhibition with specific inhibitors, functional readout and biochemical confirmation of substrate degradation","pmids":["15963503"],"is_preprint":false},{"year":2008,"finding":"Human NEP2 (neprilysin-2, homologous to MME/NEP) exists as a membrane-bound and soluble enzyme with distinct subcellular localization (ER and plasma membrane glycoforms) and displays distinct substrate specificity and inhibitor binding compared to NEP, suggesting non-redundant physiological roles.","method":"Cloning and expression of human NEP2 isoforms, subcellular fractionation, substrate specificity assays, inhibitor binding studies","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1-2 — enzymatic characterization with defined substrates and inhibitors, single lab","pmids":["18539150"],"is_preprint":false},{"year":2007,"finding":"HSP27 and HSP70 interact with CD10/MME in C4-2 prostate cancer cells, identified by immunoprecipitation of CD10-protein complexes followed by mass spectrometry; the interaction was confirmed by reciprocal immunopurification with anti-HSP27 and anti-HSP70 antibodies.","method":"Immunoprecipitation with anti-CD10 antibody, microLC-ESI-MS/MS proteomics, Western blot confirmation, reciprocal immunoprecipitation","journal":"The Prostate","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal co-IP confirmed by Western blot, single lab","pmids":["17342744"],"is_preprint":false},{"year":2022,"finding":"lncRNA XIST represses NEP expression by recruiting EZH2 to the NEP promoter, leading to H3K27me3 enrichment at the promoter; XIST knockdown restores NEP expression and alleviates Aβ-induced neuronal inflammation and damage.","method":"RIP (RNA immunoprecipitation) to validate XIST-EZH2 binding, ChIP to confirm H3K27me3 enrichment at NEP promoter, Western blot, qRT-PCR, ELISA, TUNEL assay","journal":"Journal of neurogenetics","confidence":"Medium","confidence_rationale":"Tier 2 — RIP and ChIP provide direct mechanistic evidence for epigenetic repression, single lab","pmids":["35098860"],"is_preprint":false},{"year":2019,"finding":"CD10 expression in adventitial perivascular cells increases their proliferation and osteogenic differentiation; CD10+ cells activate CCND2 via ERK1/2 signaling and osteoblastogenic gene expression via NF-κB signaling; CD10 expression in these cells is upregulated through sonic hedgehog-mediated GLI1 signaling.","method":"FACS sorting, proliferation and clonogenic assays, osteogenic differentiation assays, Western blot for ERK1/2 and NF-κB pathway components, gene expression analysis","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays with defined signaling readouts, single lab","pmids":["31721342"],"is_preprint":false},{"year":1991,"finding":"NEP (neutral metalloendopeptidase EC 3.4.24.11) is the major degradative enzyme for atrial natriuretic peptide (ANP) in the kidney; NEP activity is 18-fold higher in the outer stripe of the medulla than in the outer cortex, with the highest activity in juxtamedullary proximal tubules; activity is specifically inhibited by NEP inhibitors SCH39370, phosphoramidon, and thiorphan at micromolar concentrations.","method":"Enzymatic fluorimetric activity assay with synthetic substrate, regional kidney fractionation, specific inhibitor studies","journal":"Clinical and experimental pharmacology & physiology","confidence":"Medium","confidence_rationale":"Tier 1 — direct enzymatic assay with specific inhibitors and subcellular/regional fractionation","pmids":["1833101"],"is_preprint":false},{"year":2014,"finding":"CpG sites in the NEP gene promoter are hypermethylated in N2a neuroblastoma cells expressing APP; curcumin treatment induces CpG demethylation at the NEP promoter to restore NEP expression, and NEP upregulation is associated with inhibition of AKT and subsequent suppression of NF-κB and downstream inflammatory targets (COX-2, iNOS).","method":"Bisulfite-sequencing PCR (BSP) assay for CpG methylation, Western blot for NEP/AKT/NF-κB pathway proteins, pharmacological treatment with curcumin","journal":"The AAPS journal","confidence":"Medium","confidence_rationale":"Tier 2 — direct epigenetic methylation assay with functional pathway readout, single lab","pmids":["24756894"],"is_preprint":false}],"current_model":"MME/NEP (neprilysin/CD10) is a type II integral membrane zinc metalloendopeptidase (M13 family) that cleaves a broad range of bioactive peptides (enkephalins, natriuretic peptides, CGRP, Aβ, bradykinin) at the cell surface to terminate peptide signaling; its enzymatic activity is required for growth arrest in T cells, suppression of cancer cell metastasis via inhibition of the FAK-RhoA axis, and maintenance of the mammary stem cell niche; it interacts with tetraspanin CD9 (which directs its release on exosomes) and with HSP27/HSP70 in prostate cancer cells; its expression is epigenetically repressed by lncRNA XIST/EZH2-mediated H3K27me3 at its promoter; and loss-of-function mutations in MME reduce enzymatic activity and cause late-onset axonal polyneuropathies as well as fetomaternal alloimmune glomerulonephritis."},"narrative":{"teleology":[{"year":1991,"claim":"Establishing the enzymology: NEP was shown to be the principal degradative enzyme for atrial natriuretic peptide in kidney, with regionally graded activity inhibitable by specific metallopeptidase inhibitors, linking a defined enzymatic activity to organ-level peptide catabolism.","evidence":"Fluorimetric enzymatic assay with specific inhibitors (thiorphan, phosphoramidon) across kidney subregions","pmids":["1833101"],"confidence":"Medium","gaps":["Substrate selectivity versus other renal peptidases not quantified","In vivo functional consequences of renal NEP inhibition not tested"]},{"year":1997,"claim":"NEP was characterized as a broad-spectrum type II membrane zinc metalloendopeptidase (M13 family) that terminates signaling by cleaving diverse bioactive peptides including enkephalins and natriuretic peptides, establishing its identity as a general peptide-inactivating ectoenzyme.","evidence":"Biochemical characterization, structural homology analysis, substrate hydrolysis assays, and inhibitor (phosphoramidon) studies across multiple labs","pmids":["9141502","11223883"],"confidence":"High","gaps":["Full structural basis for substrate recognition not resolved at atomic level at this time"]},{"year":1997,"claim":"The catalytic activity of CD10/NEP was shown to be essential for a cellular phenotype — PMA-induced growth arrest in T cells — by demonstrating that catalytically inactive mutant CD10 failed to rescue arrest while wild-type did, moving beyond substrate cataloguing to functional biology.","evidence":"Transfection of wild-type vs. active-site-mutant CD10 into CD10-deficient Jurkat clones, proliferation and DNA fragmentation assays","pmids":["9285485","1396581"],"confidence":"High","gaps":["Endogenous peptide substrate mediating growth arrest not identified","Downstream signaling pathway linking peptide cleavage to cell cycle arrest unknown"]},{"year":2001,"claim":"NEP was identified as a major amyloid-β-degrading enzyme, cleaving both Aβ(1-40) and Aβ(1-42) in vitro and in vivo, providing a mechanistic link between NEP activity and Alzheimer's disease pathology.","evidence":"In vitro peptide cleavage assays and in vivo studies with NEP-specific inhibitors (thiorphan, phosphoramidon)","pmids":["12067222"],"confidence":"High","gaps":["Relative contribution of NEP versus other Aβ-degrading enzymes (IDE, ECE) in human brain not quantified","Whether NEP upregulation is sufficient to prevent amyloid plaque formation in humans untested"]},{"year":2004,"claim":"Truncating MME mutations were shown to cause complete loss of NEP protein on granulocytes and podocytes, leading to maternal alloimmunization against fetal NEP and antenatal membranous glomerulonephritis — the first Mendelian disease linked to MME loss-of-function.","evidence":"Genomic sequencing, SNP haplotyping, Western blot for anti-NEP IgG subclasses, replicated across multiple families","pmids":["15464186"],"confidence":"High","gaps":["Whether partial loss-of-function alleles also provoke alloimmunization unknown","Frequency of MME null alleles in general population not established"]},{"year":2005,"claim":"NEP was established as the major CGRP-degrading enzyme in human skin, directly linking its peptidase activity to neurogenic inflammation control in vivo.","evidence":"Intracutaneous microdialysis with specific inhibitors (phosphoramidon), laser Doppler imaging of neurogenic flare, CGRP EIA","pmids":["15963503"],"confidence":"High","gaps":["Whether other skin peptidases partially compensate for NEP inhibition not resolved"]},{"year":2010,"claim":"Two studies expanded MME's roles: enzymatic activity was shown to maintain mammary stem/progenitor cells in an undifferentiated state, and a nonsynonymous variant (Val73) was shown to undergo proteasome/autophagy-mediated degradation due to misfolding, reducing activity to 21% of wild-type.","evidence":"FACS sorting/sphere assays with CD10 inhibition for mammary stem cells; expression constructs in COS-1 cells with enzyme activity assays, proteasome/autophagy inhibitor studies, and chaperone upregulation analysis for the Val73 variant","pmids":["20506111","20692264"],"confidence":"Medium","gaps":["Endogenous peptide substrate in mammary niche not identified","In vivo relevance of Val73 variant to cardiovascular or neurological phenotypes not established","Whether other M13 family members compensate in mammary tissue unknown"]},{"year":2013,"claim":"CD9 tetraspanin was identified as a selective physical partner that redirects NEP from the cell surface to exosomes, enhancing exosomal NEP release ~5-fold without altering enzymatic activity, revealing a mechanism for redistributing peptidase activity to extracellular microenvironments.","evidence":"Co-immunoprecipitation, CD9 chimera/mutagenesis, shRNA knockdown, exosome isolation, fluorometric peptidase assay","pmids":["23289620"],"confidence":"High","gaps":["Functional consequence of exosomal NEP on recipient cells not demonstrated","Whether CD9-NEP interaction is tissue-specific unknown"]},{"year":2016,"claim":"Heterozygous loss-of-function and missense MME mutations were linked to late-onset axonal polyneuropathy (CMT2), with impaired enzymatic activity and reduced tissue protein, establishing a second Mendelian disease caused by MME deficiency.","evidence":"Whole-exome/Sanger sequencing, nerve pathology, tissue neprilysin activity assays across 19 index cases","pmids":["27588448"],"confidence":"High","gaps":["Peptide substrate whose accumulation causes axonal degeneration not identified","Mechanism of age-dependent incomplete penetrance not explained"]},{"year":2019,"claim":"MME was shown to suppress cancer metastasis through a non-canonical mechanism — inhibiting FAK phosphorylation and disrupting FAK-RhoA signaling — extending its function beyond peptide catabolism to regulation of cell adhesion and motility, and active NEP was found on circulating placental extracellular vesicles with elevated levels in preeclampsia.","evidence":"Overexpression/knockdown in ESCC cells with migration/invasion assays, FAK/RhoA Western blots, xenograft models; syncytiotrophoblast vesicle isolation with flow cytometry and fluorometric NEP assays","pmids":["31054987","30929513"],"confidence":"Medium","gaps":["Whether FAK inhibition is mediated by peptide cleavage or a direct protein interaction is unresolved","Causal role of vesicle-bound NEP in preeclampsia pathogenesis not demonstrated","FAK-RhoA finding from single lab"]},{"year":2022,"claim":"Epigenetic silencing of NEP was mechanistically dissected: lncRNA XIST recruits EZH2 to the NEP promoter to deposit H3K27me3, repressing expression; this complements earlier findings that promoter CpG hypermethylation also silences NEP, establishing dual epigenetic control of NEP transcription.","evidence":"RIP for XIST-EZH2 binding, ChIP for H3K27me3 at NEP promoter, XIST knockdown rescue experiments; bisulfite sequencing of NEP promoter CpG methylation","pmids":["35098860","24756894"],"confidence":"Medium","gaps":["Whether XIST-mediated repression is tissue-specific or universal unknown","Relationship between CpG methylation and H3K27me3 at the NEP promoter not integrated","In vivo relevance of XIST-NEP axis to Alzheimer's pathology not tested"]},{"year":null,"claim":"Key unresolved questions include: the identity of the endogenous peptide substrates whose accumulation drives axonal degeneration in CMT2; whether the FAK-RhoA suppression by MME is mediated through peptide cleavage or direct protein interaction; and the physiological significance of exosomal NEP activity on target cells.","evidence":"","pmids":[],"confidence":"Low","gaps":["Neuropathy-causing substrate not identified","Structural basis of FAK-RhoA regulation by MME unresolved","Functional impact of exosomal NEP on recipient cell signaling not demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,3,4,7,9,12,17]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,12,17]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,6]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[6,11]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,9,12,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5,10,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,8,10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4]}],"complexes":[],"partners":["CD9","HSPB1","HSPA1A","EZH2","FAK"],"other_free_text":[]},"mechanistic_narrative":"MME (neprilysin/CD10) is a type II integral membrane zinc metalloendopeptidase of the M13 family that terminates bioactive peptide signaling by cleaving substrates including enkephalins, atrial natriuretic peptide, amyloid-β, CGRP, and mitogenic neuropeptides at the cell surface [PMID:9141502, PMID:12067222, PMID:15963503, PMID:1833101]. Its enzymatic activity is required for PMA-induced growth arrest in T cells, maintenance of the mammary stem/progenitor cell niche, and suppression of cancer metastasis through inhibition of FAK-RhoA signaling [PMID:9285485, PMID:20506111, PMID:31054987]. MME associates with tetraspanin CD9, which directs its release on exosomes and thereby redistributes peptidase activity to extracellular compartments, and its expression is epigenetically regulated by promoter CpG methylation and lncRNA XIST/EZH2-mediated H3K27me3 deposition [PMID:23289620, PMID:35098860, PMID:24756894]. Loss-of-function mutations in MME cause fetomaternal alloimmune membranous glomerulonephritis and late-onset autosomal-dominant axonal polyneuropathies (CMT2) [PMID:15464186, PMID:27588448]."},"prefetch_data":{"uniprot":{"accession":"P08473","full_name":"Neprilysin","aliases":["Atriopeptidase","Common acute lymphocytic leukemia antigen","CALLA","Enkephalinase","Neutral endopeptidase 24.11","NEP","Neutral endopeptidase","Skin fibroblast elastase","SFE"],"length_aa":750,"mass_kda":85.5,"function":"Thermolysin-like specificity, but is almost confined on acting on polypeptides of up to 30 amino acids (PubMed:15283675, PubMed:6208535, PubMed:6349683, PubMed:8168535). Biologically important in the destruction of opioid peptides such as Met- and Leu-enkephalins by cleavage of a Gly-Phe bond (PubMed:17101991, PubMed:6349683). Catalyzes cleavage of bradykinin, substance P and neurotensin peptides (PubMed:6208535). Able to cleave angiotensin-1, angiotensin-2 and angiotensin 1-9 (PubMed:15283675, PubMed:6349683). Involved in the degradation of atrial natriuretic factor (ANF) and brain natriuretic factor (BNP(1-32)) (PubMed:16254193, PubMed:2531377, PubMed:2972276). 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Prostate","url":"https://pubmed.ncbi.nlm.nih.gov/17342744","citation_count":17,"is_preprint":false},{"pmid":"2959334","id":"PMC_2959334","title":"Identification and characterization of a unique subpopulation (CALLA/CD10/negative) of human neutrophils manifesting a heightened chemotactic response to activated complement.","date":"1987","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/2959334","citation_count":16,"is_preprint":false},{"pmid":"16116347","id":"PMC_16116347","title":"Triple ACE-ECE-NEP inhibition in heart failure: a comparison with ACE and dual ECE-NEP inhibition.","date":"2005","source":"Journal of cardiovascular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/16116347","citation_count":16,"is_preprint":false},{"pmid":"26386615","id":"PMC_26386615","title":"Study of Ki67 and CD10 expression as predictive factors of recurrence of ameloblastoma.","date":"2015","source":"European annals of otorhinolaryngology, head and neck diseases","url":"https://pubmed.ncbi.nlm.nih.gov/26386615","citation_count":16,"is_preprint":false},{"pmid":"38389922","id":"PMC_38389922","title":"A comprehensive review of the literature on CD10: its function, clinical application, and prospects.","date":"2024","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38389922","citation_count":16,"is_preprint":false},{"pmid":"23063927","id":"PMC_23063927","title":"Copy number variation in ACHE/EPHB4 (7q22) and in BCHE/MME (3q26) genes in sporadic breast cancer.","date":"2012","source":"Chemico-biological interactions","url":"https://pubmed.ncbi.nlm.nih.gov/23063927","citation_count":16,"is_preprint":false},{"pmid":"27513891","id":"PMC_27513891","title":"CD10 down expression in follicular lymphoma correlates with gastrointestinal lesion involving the stomach and large intestine.","date":"2016","source":"Cancer 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bradykinin-induced relaxation and contraction response of isolated porcine basilar artery.","date":"2002","source":"Naunyn-Schmiedeberg's archives of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/12012022","citation_count":15,"is_preprint":false},{"pmid":"10714440","id":"PMC_10714440","title":"Increased expression of neutral endopeptidase (NEP) and aminopeptidase N (APN) on peripheral blood mononuclear cells in patients with multiple sclerosis.","date":"2000","source":"Immunology letters","url":"https://pubmed.ncbi.nlm.nih.gov/10714440","citation_count":15,"is_preprint":false},{"pmid":"19752720","id":"PMC_19752720","title":"CD10 (Neutral Endopeptidase) Expression in Myoepithelial Cells of Salivary Neoplasms.","date":"2010","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/19752720","citation_count":14,"is_preprint":false},{"pmid":"1833101","id":"PMC_1833101","title":"Distribution and inhibition of neutral metalloendopeptidase (NEP) (EC 3.4.24.11), the major degradative enzyme for atrial natriuretic peptide, in the rat kidney.","date":"1991","source":"Clinical and experimental pharmacology & physiology","url":"https://pubmed.ncbi.nlm.nih.gov/1833101","citation_count":13,"is_preprint":false},{"pmid":"27616053","id":"PMC_27616053","title":"IFR4/MUM1-positive lymphoma in Waldeyer ring with co-expression of CD5 and CD10.","date":"2016","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/27616053","citation_count":13,"is_preprint":false},{"pmid":"32256144","id":"PMC_32256144","title":"Interaction of influenza A virus NS2/NEP protein with the amino-terminal part of Nup214.","date":"2020","source":"Turkish journal of biology = Turk biyoloji dergisi","url":"https://pubmed.ncbi.nlm.nih.gov/32256144","citation_count":13,"is_preprint":false},{"pmid":"28346124","id":"PMC_28346124","title":"Pax8, Napsin A, and CD10 as Immunohistochemical Markers of Canine Renal Cell Carcinoma.","date":"2017","source":"Veterinary pathology","url":"https://pubmed.ncbi.nlm.nih.gov/28346124","citation_count":12,"is_preprint":false},{"pmid":"22924846","id":"PMC_22924846","title":"Early colorectal carcinomas: CD10 expression, mucin phenotype and submucosal invasion.","date":"2012","source":"Pathology international","url":"https://pubmed.ncbi.nlm.nih.gov/22924846","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50598,"output_tokens":4615,"usd":0.110509},"stage2":{"model":"claude-opus-4-6","input_tokens":8104,"output_tokens":3155,"usd":0.179092},"total_usd":0.289601,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"MME/NEP (neutral endopeptidase-24.11) is a type II integral membrane zinc metallopeptidase (M13 family) that hydrolyzes a wide range of biologically active peptide substrates at the cell surface, including enkephalins and atrial natriuretic peptides, functioning as a thermolysin-like endopeptidase to terminate peptide signaling.\",\n      \"method\": \"Biochemical characterization, structural homology analysis, substrate hydrolysis assays, inhibitor studies (phosphoramidon)\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biochemical methods, replicated across labs, foundational review synthesizing extensive experimental literature\",\n      \"pmids\": [\"9141502\", \"11223883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NEP degrades both Aβ(1-40) and Aβ(1-42) in vitro and in vivo, and this catabolism is blocked by NEP-specific inhibitors (thiorphan, phosphoramidon), establishing NEP as a key amyloid-degrading enzyme.\",\n      \"method\": \"In vitro peptide cleavage assays, in vivo animal studies with NEP inhibitors, enzyme inhibitor studies\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution plus in vivo validation, replicated across labs\",\n      \"pmids\": [\"12067222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Truncating mutations (nonsense and frameshift) in the MME gene result in absence of NEP protein on granulocytes and podocytes, leading to maternal alloimmunization against fetal NEP antigen on glomerular podocytes and antenatal membranous glomerulonephritis; IgG subclass analysis confirmed anti-NEP activity.\",\n      \"method\": \"Direct sequencing of genomic PCR products, SNP analysis, Western blotting for IgG subclasses with anti-NEP activity\",\n      \"journal\": \"Lancet\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (sequencing, SNP haplotyping, Western blot), replicated in multiple families\",\n      \"pmids\": [\"15464186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Jurkat T cells express a functional NEP/CD10 endopeptidase activity (CALLA-related) that cleaves the substrate Suc-Ala-Ala-Phe-pNA; this activity is inhibited by specific endopeptidase 24.11 inhibitors and immunoprecipitated by anti-CD10 monoclonal antibodies, demonstrating that T lymphocytes express functional NEP involved in T cell activation.\",\n      \"method\": \"Enzymatic substrate hydrolysis assays with specific inhibitors, anti-CD10 immunoprecipitation, HPLC analysis of cleavage products, FACS, mRNA analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution-level enzymatic assays with inhibitor validation and immunoprecipitation confirmation\",\n      \"pmids\": [\"1396581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The enzymatic activity of CD10/NEP is required for PMA-induced growth arrest in Jurkat T cells; transfection of an enzymatically inactive form of CD10 into CD10-deficient PMA-resistant clones failed to restore growth arrest, whereas transfection of functional CD10 rescued this phenotype.\",\n      \"method\": \"Transfection of wild-type vs. catalytically inactive CD10 into mutant Jurkat clones, proliferation assays, DNA fragmentation assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional rescue with active-site mutant versus wild-type, clean genetic epistasis\",\n      \"pmids\": [\"9285485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"CD10/NEP modulates peptide-mediated proliferation in non-small cell lung carcinomas; cells with low CD10/NEP expression grew more rapidly when CD10/NEP was inhibited, and CD10/NEP expression was inversely correlated with PCNA-positive (actively dividing) cells, demonstrating that CD10/NEP suppresses peptide-driven proliferation by degrading mitogenic peptide substrates.\",\n      \"method\": \"CD10/NEP immunostaining, PCNA staining, cell growth inhibition assays with CD10/NEP inhibitors, receptor expression analysis\",\n      \"journal\": \"Journal of Clinical Investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (IHC, growth assays, inhibitor treatment) in one lab\",\n      \"pmids\": [\"7962523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Tetraspanin CD9 selectively associates with MME/CD10 at the cell surface; the large extracellular loop (CCG motif to TM4) and C-terminal tail of CD9 mediate this interaction; CD9 co-expression enhances CD10 release on exosomes ~5-fold without altering its enzymatic activity, redistributing NEP peptidase activity from the cell surface to extracellular microenvironments.\",\n      \"method\": \"Co-immunoprecipitation, chimera construction, site-directed mutagenesis of CD9, shRNA knockdown of CD9, exosome isolation, fluorometric peptidase activity assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including mutagenesis, knockdown, and functional enzyme assays in one study\",\n      \"pmids\": [\"23289620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MME/CD10 protease activity (and beta1-integrin adhesion) are required to prevent differentiation of mammary progenitor/stem cells; CD10-high/EpCAM-low cells are enriched for early common progenitors and mammosphere-forming cells; inhibition of CD10 enzymatic activity promotes differentiation, demonstrating that CD10-mediated cleavage of signaling peptides maintains the mammary stem cell niche.\",\n      \"method\": \"FACS sorting for CD10/EpCAM, sphere formation assays, CD10 enzymatic inhibition studies, lineage progression in vitro assay\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean functional assays with enzymatic inhibition, single lab with multiple methods\",\n      \"pmids\": [\"20506111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rare heterozygous loss-of-function and missense mutations in MME result in strongly decreased tissue availability of neprilysin protein and impaired enzymatic activity, causing late-onset autosomal-dominant axonal polyneuropathies (CMT2); mutations segregate with age-related incomplete penetrance.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, nerve pathology, tissue neprilysin activity assays, protein level quantification\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — enzymatic activity assays plus protein quantification in patient tissue, replicated across 19 index cases\",\n      \"pmids\": [\"27588448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A nonsynonymous MME variant (Val73 allozyme) displays a significant reduction in enzyme activity (21% of wild-type) and immunoreactive protein (29% of wild-type); this variant undergoes proteasome-mediated degradation and autophagy, with upregulation of chaperones BiP and GRP94 suggesting protein misfolding, consistent with the MME X-ray crystal structure.\",\n      \"method\": \"Resequencing, expression constructs in COS-1 cells, quantitative Western blot, one-step fluorometric enzyme assay, inhibitor studies for proteasome/autophagy pathways, chaperone upregulation analysis\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in cell expression system with enzyme activity assay and mechanistic degradation pathway characterization\",\n      \"pmids\": [\"20692264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MME suppresses metastasis of esophageal squamous cell carcinoma by inhibiting phosphorylation of FAK and disrupting the FAK-RhoA signaling axis; MME overexpression also interrupts tumor cell adhesion, demonstrating a mechanistic role for MME in cell movement regulation beyond peptide catabolism.\",\n      \"method\": \"MME overexpression/knockdown in ESCC cells, in vitro migration and invasion assays, in vivo xenograft models, Western blot for FAK phosphorylation and RhoA activity, cell adhesion assays\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with defined signaling pathway readouts, single lab\",\n      \"pmids\": [\"31054987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEP (neprilysin) is present on syncytiotrophoblast-derived extracellular vesicles (microvesicles and exosomes) in enzymatically active form; NEP activity on these vesicles is inhibited by the specific inhibitor thiorphan, and vesicle-bound NEP levels are significantly elevated in preeclampsia, indicating that circulating placenta-derived vesicles carry active NEP into the maternal circulation.\",\n      \"method\": \"Immunostaining, Western blotting, antibody-coated magnetic bead isolation, flow cytometry, size-exclusion chromatography, fluorometric NEP activity assay with thiorphan inhibition\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods confirming active NEP on extracellular vesicles with specific inhibitor validation\",\n      \"pmids\": [\"30929513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NEP (neutral endopeptidase) degrades CGRP in human skin; inhibition of NEP with phosphoramidon increased neurogenic flare intensity and size and enabled CGRP detection in microdialysis samples, establishing NEP as the major enzyme responsible for CGRP degradation in neurogenic inflammation.\",\n      \"method\": \"Intracutaneous microdialysis with specific inhibitors (phosphoramidon for NEP, captopril for ACE), laser Doppler imaging, CGRP EIA\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vivo pharmacological inhibition with specific inhibitors, functional readout and biochemical confirmation of substrate degradation\",\n      \"pmids\": [\"15963503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human NEP2 (neprilysin-2, homologous to MME/NEP) exists as a membrane-bound and soluble enzyme with distinct subcellular localization (ER and plasma membrane glycoforms) and displays distinct substrate specificity and inhibitor binding compared to NEP, suggesting non-redundant physiological roles.\",\n      \"method\": \"Cloning and expression of human NEP2 isoforms, subcellular fractionation, substrate specificity assays, inhibitor binding studies\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — enzymatic characterization with defined substrates and inhibitors, single lab\",\n      \"pmids\": [\"18539150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HSP27 and HSP70 interact with CD10/MME in C4-2 prostate cancer cells, identified by immunoprecipitation of CD10-protein complexes followed by mass spectrometry; the interaction was confirmed by reciprocal immunopurification with anti-HSP27 and anti-HSP70 antibodies.\",\n      \"method\": \"Immunoprecipitation with anti-CD10 antibody, microLC-ESI-MS/MS proteomics, Western blot confirmation, reciprocal immunoprecipitation\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP confirmed by Western blot, single lab\",\n      \"pmids\": [\"17342744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"lncRNA XIST represses NEP expression by recruiting EZH2 to the NEP promoter, leading to H3K27me3 enrichment at the promoter; XIST knockdown restores NEP expression and alleviates Aβ-induced neuronal inflammation and damage.\",\n      \"method\": \"RIP (RNA immunoprecipitation) to validate XIST-EZH2 binding, ChIP to confirm H3K27me3 enrichment at NEP promoter, Western blot, qRT-PCR, ELISA, TUNEL assay\",\n      \"journal\": \"Journal of neurogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP and ChIP provide direct mechanistic evidence for epigenetic repression, single lab\",\n      \"pmids\": [\"35098860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD10 expression in adventitial perivascular cells increases their proliferation and osteogenic differentiation; CD10+ cells activate CCND2 via ERK1/2 signaling and osteoblastogenic gene expression via NF-κB signaling; CD10 expression in these cells is upregulated through sonic hedgehog-mediated GLI1 signaling.\",\n      \"method\": \"FACS sorting, proliferation and clonogenic assays, osteogenic differentiation assays, Western blot for ERK1/2 and NF-κB pathway components, gene expression analysis\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with defined signaling readouts, single lab\",\n      \"pmids\": [\"31721342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"NEP (neutral metalloendopeptidase EC 3.4.24.11) is the major degradative enzyme for atrial natriuretic peptide (ANP) in the kidney; NEP activity is 18-fold higher in the outer stripe of the medulla than in the outer cortex, with the highest activity in juxtamedullary proximal tubules; activity is specifically inhibited by NEP inhibitors SCH39370, phosphoramidon, and thiorphan at micromolar concentrations.\",\n      \"method\": \"Enzymatic fluorimetric activity assay with synthetic substrate, regional kidney fractionation, specific inhibitor studies\",\n      \"journal\": \"Clinical and experimental pharmacology & physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — direct enzymatic assay with specific inhibitors and subcellular/regional fractionation\",\n      \"pmids\": [\"1833101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CpG sites in the NEP gene promoter are hypermethylated in N2a neuroblastoma cells expressing APP; curcumin treatment induces CpG demethylation at the NEP promoter to restore NEP expression, and NEP upregulation is associated with inhibition of AKT and subsequent suppression of NF-κB and downstream inflammatory targets (COX-2, iNOS).\",\n      \"method\": \"Bisulfite-sequencing PCR (BSP) assay for CpG methylation, Western blot for NEP/AKT/NF-κB pathway proteins, pharmacological treatment with curcumin\",\n      \"journal\": \"The AAPS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct epigenetic methylation assay with functional pathway readout, single lab\",\n      \"pmids\": [\"24756894\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MME/NEP (neprilysin/CD10) is a type II integral membrane zinc metalloendopeptidase (M13 family) that cleaves a broad range of bioactive peptides (enkephalins, natriuretic peptides, CGRP, Aβ, bradykinin) at the cell surface to terminate peptide signaling; its enzymatic activity is required for growth arrest in T cells, suppression of cancer cell metastasis via inhibition of the FAK-RhoA axis, and maintenance of the mammary stem cell niche; it interacts with tetraspanin CD9 (which directs its release on exosomes) and with HSP27/HSP70 in prostate cancer cells; its expression is epigenetically repressed by lncRNA XIST/EZH2-mediated H3K27me3 at its promoter; and loss-of-function mutations in MME reduce enzymatic activity and cause late-onset axonal polyneuropathies as well as fetomaternal alloimmune glomerulonephritis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MME (neprilysin/CD10) is a type II integral membrane zinc metalloendopeptidase of the M13 family that terminates bioactive peptide signaling by cleaving substrates including enkephalins, atrial natriuretic peptide, amyloid-β, CGRP, and mitogenic neuropeptides at the cell surface [PMID:9141502, PMID:12067222, PMID:15963503, PMID:1833101]. Its enzymatic activity is required for PMA-induced growth arrest in T cells, maintenance of the mammary stem/progenitor cell niche, and suppression of cancer metastasis through inhibition of FAK-RhoA signaling [PMID:9285485, PMID:20506111, PMID:31054987]. MME associates with tetraspanin CD9, which directs its release on exosomes and thereby redistributes peptidase activity to extracellular compartments, and its expression is epigenetically regulated by promoter CpG methylation and lncRNA XIST/EZH2-mediated H3K27me3 deposition [PMID:23289620, PMID:35098860, PMID:24756894]. Loss-of-function mutations in MME cause fetomaternal alloimmune membranous glomerulonephritis and late-onset autosomal-dominant axonal polyneuropathies (CMT2) [PMID:15464186, PMID:27588448].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing the enzymology: NEP was shown to be the principal degradative enzyme for atrial natriuretic peptide in kidney, with regionally graded activity inhibitable by specific metallopeptidase inhibitors, linking a defined enzymatic activity to organ-level peptide catabolism.\",\n      \"evidence\": \"Fluorimetric enzymatic assay with specific inhibitors (thiorphan, phosphoramidon) across kidney subregions\",\n      \"pmids\": [\"1833101\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate selectivity versus other renal peptidases not quantified\", \"In vivo functional consequences of renal NEP inhibition not tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"NEP was characterized as a broad-spectrum type II membrane zinc metalloendopeptidase (M13 family) that terminates signaling by cleaving diverse bioactive peptides including enkephalins and natriuretic peptides, establishing its identity as a general peptide-inactivating ectoenzyme.\",\n      \"evidence\": \"Biochemical characterization, structural homology analysis, substrate hydrolysis assays, and inhibitor (phosphoramidon) studies across multiple labs\",\n      \"pmids\": [\"9141502\", \"11223883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full structural basis for substrate recognition not resolved at atomic level at this time\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The catalytic activity of CD10/NEP was shown to be essential for a cellular phenotype — PMA-induced growth arrest in T cells — by demonstrating that catalytically inactive mutant CD10 failed to rescue arrest while wild-type did, moving beyond substrate cataloguing to functional biology.\",\n      \"evidence\": \"Transfection of wild-type vs. active-site-mutant CD10 into CD10-deficient Jurkat clones, proliferation and DNA fragmentation assays\",\n      \"pmids\": [\"9285485\", \"1396581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous peptide substrate mediating growth arrest not identified\", \"Downstream signaling pathway linking peptide cleavage to cell cycle arrest unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"NEP was identified as a major amyloid-β-degrading enzyme, cleaving both Aβ(1-40) and Aβ(1-42) in vitro and in vivo, providing a mechanistic link between NEP activity and Alzheimer's disease pathology.\",\n      \"evidence\": \"In vitro peptide cleavage assays and in vivo studies with NEP-specific inhibitors (thiorphan, phosphoramidon)\",\n      \"pmids\": [\"12067222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of NEP versus other Aβ-degrading enzymes (IDE, ECE) in human brain not quantified\", \"Whether NEP upregulation is sufficient to prevent amyloid plaque formation in humans untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Truncating MME mutations were shown to cause complete loss of NEP protein on granulocytes and podocytes, leading to maternal alloimmunization against fetal NEP and antenatal membranous glomerulonephritis — the first Mendelian disease linked to MME loss-of-function.\",\n      \"evidence\": \"Genomic sequencing, SNP haplotyping, Western blot for anti-NEP IgG subclasses, replicated across multiple families\",\n      \"pmids\": [\"15464186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether partial loss-of-function alleles also provoke alloimmunization unknown\", \"Frequency of MME null alleles in general population not established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"NEP was established as the major CGRP-degrading enzyme in human skin, directly linking its peptidase activity to neurogenic inflammation control in vivo.\",\n      \"evidence\": \"Intracutaneous microdialysis with specific inhibitors (phosphoramidon), laser Doppler imaging of neurogenic flare, CGRP EIA\",\n      \"pmids\": [\"15963503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other skin peptidases partially compensate for NEP inhibition not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Two studies expanded MME's roles: enzymatic activity was shown to maintain mammary stem/progenitor cells in an undifferentiated state, and a nonsynonymous variant (Val73) was shown to undergo proteasome/autophagy-mediated degradation due to misfolding, reducing activity to 21% of wild-type.\",\n      \"evidence\": \"FACS sorting/sphere assays with CD10 inhibition for mammary stem cells; expression constructs in COS-1 cells with enzyme activity assays, proteasome/autophagy inhibitor studies, and chaperone upregulation analysis for the Val73 variant\",\n      \"pmids\": [\"20506111\", \"20692264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous peptide substrate in mammary niche not identified\", \"In vivo relevance of Val73 variant to cardiovascular or neurological phenotypes not established\", \"Whether other M13 family members compensate in mammary tissue unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"CD9 tetraspanin was identified as a selective physical partner that redirects NEP from the cell surface to exosomes, enhancing exosomal NEP release ~5-fold without altering enzymatic activity, revealing a mechanism for redistributing peptidase activity to extracellular microenvironments.\",\n      \"evidence\": \"Co-immunoprecipitation, CD9 chimera/mutagenesis, shRNA knockdown, exosome isolation, fluorometric peptidase assay\",\n      \"pmids\": [\"23289620\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of exosomal NEP on recipient cells not demonstrated\", \"Whether CD9-NEP interaction is tissue-specific unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Heterozygous loss-of-function and missense MME mutations were linked to late-onset axonal polyneuropathy (CMT2), with impaired enzymatic activity and reduced tissue protein, establishing a second Mendelian disease caused by MME deficiency.\",\n      \"evidence\": \"Whole-exome/Sanger sequencing, nerve pathology, tissue neprilysin activity assays across 19 index cases\",\n      \"pmids\": [\"27588448\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Peptide substrate whose accumulation causes axonal degeneration not identified\", \"Mechanism of age-dependent incomplete penetrance not explained\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"MME was shown to suppress cancer metastasis through a non-canonical mechanism — inhibiting FAK phosphorylation and disrupting FAK-RhoA signaling — extending its function beyond peptide catabolism to regulation of cell adhesion and motility, and active NEP was found on circulating placental extracellular vesicles with elevated levels in preeclampsia.\",\n      \"evidence\": \"Overexpression/knockdown in ESCC cells with migration/invasion assays, FAK/RhoA Western blots, xenograft models; syncytiotrophoblast vesicle isolation with flow cytometry and fluorometric NEP assays\",\n      \"pmids\": [\"31054987\", \"30929513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether FAK inhibition is mediated by peptide cleavage or a direct protein interaction is unresolved\", \"Causal role of vesicle-bound NEP in preeclampsia pathogenesis not demonstrated\", \"FAK-RhoA finding from single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Epigenetic silencing of NEP was mechanistically dissected: lncRNA XIST recruits EZH2 to the NEP promoter to deposit H3K27me3, repressing expression; this complements earlier findings that promoter CpG hypermethylation also silences NEP, establishing dual epigenetic control of NEP transcription.\",\n      \"evidence\": \"RIP for XIST-EZH2 binding, ChIP for H3K27me3 at NEP promoter, XIST knockdown rescue experiments; bisulfite sequencing of NEP promoter CpG methylation\",\n      \"pmids\": [\"35098860\", \"24756894\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether XIST-mediated repression is tissue-specific or universal unknown\", \"Relationship between CpG methylation and H3K27me3 at the NEP promoter not integrated\", \"In vivo relevance of XIST-NEP axis to Alzheimer's pathology not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the identity of the endogenous peptide substrates whose accumulation drives axonal degeneration in CMT2; whether the FAK-RhoA suppression by MME is mediated through peptide cleavage or direct protein interaction; and the physiological significance of exosomal NEP activity on target cells.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Neuropathy-causing substrate not identified\", \"Structural basis of FAK-RhoA regulation by MME unresolved\", \"Functional impact of exosomal NEP on recipient cell signaling not demonstrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7, 9, 12, 17]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 12, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 6]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [6, 11]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 9, 12, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 10, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 8, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CD9\",\n      \"HSPB1\",\n      \"HSPA1A\",\n      \"EZH2\",\n      \"FAK\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}