{"gene":"LPCAT3","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2015,"finding":"LPCAT3 catalyzes the incorporation of arachidonate into membrane phospholipids and is required for triglyceride secretion. Intestine-specific or liver-specific Lpcat3 knockout mice show reduced plasma triglycerides, enterocyte lipid accumulation, and secretion of lipid-poor VLDL lacking arachidonoyl phospholipids. Mechanistic studies showed that Lpcat3 activity impacts membrane lipid mobility in living cells, providing a biophysical basis for arachidonoyl phospholipid requirements in lipoprotein lipidation.","method":"Tissue-specific knockout mice (intestine and liver), fluorescence microscopy for membrane lipid mobility (FRAP), lipidomics, plasma lipid measurements, VLDL characterization","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean tissue-specific KO with defined phenotypic readouts, multiple orthogonal methods (lipid mobility, lipidomics, plasma lipid profiling), and mechanistic follow-up in living cells","pmids":["25806685"],"is_preprint":false},{"year":2016,"finding":"Intestine-specific Lpcat3 deficiency significantly reduces polyunsaturated phosphatidylcholines in enterocyte plasma membranes and reduces membrane levels of lipid transporters NPC1L1, CD36, ABCA1, and ABCG8, thereby reducing lipid absorption, cholesterol secretion, and plasma triglyceride, cholesterol, and phospholipid levels. Liver-specific Lpcat3 deficiency only reduces plasma triglyceride without other lipid changes or hepatic lipid accumulation. Small intestinal Lpcat3 deficiency has a dominant effect on plasma lipid metabolism compared to liver deficiency.","method":"Inducible intestine-specific (villin-Cre-ER(T2)) and liver-specific (AAV-Cre) Lpcat3 knockout mice, plasma lipid measurements, membrane protein quantification, lipid absorption assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent tissue-specific KO models with multiple quantitative phenotypic readouts, identifying membrane transporter reduction as the mechanistic link","pmids":["26828064"],"is_preprint":false},{"year":2010,"finding":"LPCAT3 is a direct transcriptional target of the liver X receptor (LXR). A functional LXR response element (LXRE) was identified in the LPCAT3 promoter; LXR agonist T0901317 induces LPCAT3 expression in chicken and human hepatoma cells, and transactivation and EMSA assays confirmed direct LXR binding to the LXRE.","method":"Transcriptome profiling, in silico LXRE search, transactivation assays, electrophoretic mobility shift assay (EMSA), treatment with LXR agonist T0901317","journal":"Gene","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — functional promoter assay combined with EMSA demonstrating direct LXR-LXRE binding, replicated in two cell lines","pmids":["20837115"],"is_preprint":false},{"year":2018,"finding":"LPCAT3 deficiency in macrophages causes major reductions in arachidonate content of phosphatidylcholines, phosphatidylethanolamines, and plasmalogens, alters cholesterol homeostasis (increased free-to-esterified cholesterol ratio, reduced cholesterol efflux), and inhibits LXR-regulated pathways including decreased Abca1, Abcg1, and ApoE mRNA. Hematopoietic LPCAT3 deficiency accelerates atherosclerosis in Ldlr-/- mice.","method":"Lpcat3-/- mice, bone marrow transplantation into Ldlr-/- mice, lipidomics, cholesterol efflux assays, qRT-PCR for LXR target genes, atherosclerotic lesion quantification","journal":"Atherosclerosis","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple orthogonal biochemical readouts (lipidomics, cholesterol efflux, gene expression) plus in vivo atherosclerosis model","pmids":["29866392"],"is_preprint":false},{"year":2022,"finding":"Small-molecule inhibitors of LPCAT3, discovered by high-throughput screening, inhibit LPCAT3 activity in a biphasic manner possibly reflecting differential activity at each subunit of an LPCAT3 homodimer. These inhibitors cause rapid suppression of C20:4 phospholipids and corresponding increases in C22:4 phospholipids in human cells, mirroring LPCAT3-null cells, and confer partial but incomplete protection from ferroptosis.","method":"High-throughput enzymatic screening, cell-based lipid profiling (lipidomics), LPCAT3-null cell comparison, ferroptosis assays","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic inhibition plus cell-based lipidomic validation with genetic controls, multiple orthogonal readouts in one study","pmids":["35658397"],"is_preprint":false},{"year":2020,"finding":"LPCAT3 incorporates arachidonoyl (C20:4) chains into phosphatidylserine (PS) in the brain. Genetic deletion of LPCAT3 in mice lacking the lyso-PS lipase ABHD12 blocks accumulation of C20:4 PS in the brain but produces hyper-increases in lyso-PS levels. These lipid changes correlate with exacerbated auditory dysfunction and brain microgliosis in mice lacking both ABHD12 and LPCAT3, revealing that ABHD12 and LPCAT3 coordinately regulate lyso-PS and C20:4 PS in the CNS.","method":"Double-knockout mice (Abhd12-/-; Lpcat3-/-), brain lipidomics, auditory function testing, brain microgliosis histology","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using double-KO mice with lipidomics and functional physiological readouts","pmids":["32364701"],"is_preprint":false},{"year":2016,"finding":"Liver-specific overexpression of LPCAT3 (converting lysophosphatidylcholine to phosphatidylcholine) alleviates lysophospholipid inhibition of fatty acid β-oxidation in hepatocytes, improves postprandial hyperglycemia and glucose tolerance, reduces VLDL production, and elevates large apoE-rich HDL in plasma.","method":"Adenovirus-mediated hepatic overexpression in C57BL/6 mice, glucose tolerance tests after lipid-glucose mixed meal, VLDL/HDL characterization, fatty acid β-oxidation assays in hepatocytes","journal":"Nutrition & diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression model with defined metabolic phenotype and mechanistic link to β-oxidation, single lab","pmids":["27110687"],"is_preprint":false},{"year":2023,"finding":"LPCAT3 transcription is regulated by YAP, ZEB, and EP300. ZEB directly binds the LPCAT3 promoter in the -1600 to -1401 nt region in a YAP-dependent manner; YAP and ZEB interact via ZEB's zinc-finger cluster domain and YAP's WW domain; EP300 binds YAP via its Bromo domain and ZEB via its CBP/p300-HAT domain, and induces H3K27Ac at the LPCAT3 locus. LPCAT3 and ACSL4 sensitize lung adenocarcinoma cells to ferroptosis.","method":"ChIP assays, luciferase reporter assays, domain mutagenesis, Co-IP, LPCAT3/ACSL4 overexpression and knockout in LUAD cell lines and xenograft models","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, reporter assays, Co-IP, and domain mutagenesis from single lab with xenograft validation","pmids":["37166352"],"is_preprint":false},{"year":2024,"finding":"MALT1 upregulates LPCAT3 expression in chondrocytes via c-Myc, driving incorporation of arachidonic acid into membranes and subsequent eicosanoid production, MMP3 and ADAMTS5 expression, and cytokine secretion. Pharmacological inhibition of MALT1 or siRNA knockdown of LPCAT3 suppresses IL-1β-induced cartilage catabolism and attenuates osteoarthritis in a mouse DMM model.","method":"MALT1 overexpression/pharmacological inhibition in chondrocytes and human cartilage explants, LPCAT3 siRNA-lipid nanoparticles, c-Myc inhibition, DMM mouse model, cytokine/eicosanoid measurements","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological perturbations with defined molecular pathway (MALT1-c-Myc-LPCAT3) and in vivo validation, single lab","pmids":["38519981"],"is_preprint":false},{"year":2024,"finding":"LPCAT3 is transcriptionally regulated by USF2 in the context of sepsis-induced acute kidney injury. USF2 binds the LPCAT3 promoter (confirmed by ChIP-qPCR and dual-luciferase assay) to upregulate LPCAT3, which promotes ferroptosis via the NRF2/HO-1/GPX4 pathway. LPCAT3 knockdown in vivo ameliorates sepsis-AKI.","method":"ChIP-qPCR, dual-luciferase reporter assay, LPCAT3 knockdown (siRNA and AAV-shRNA in vivo), LPS-induced AKI model, ferroptosis marker quantification","journal":"Shock","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transcription factor binding confirmed by ChIP and luciferase assay, with in vivo validation, single lab","pmids":["40138726"],"is_preprint":false},{"year":2025,"finding":"METTL14 (an m6A writer) promotes LPCAT3 mRNA m6A methylation, increasing LPCAT3 mRNA stability and expression, which drives ferroptosis in sepsis-induced AKI. METTL14 knockdown reduces m6A and mRNA levels of LPCAT3, and LPCAT3 overexpression reverses the ferroptosis-protective effects of METTL14 silencing.","method":"Me-RIP assay for m6A on LPCAT3 mRNA, RIP assay, dual-luciferase reporter assay, siRNA knockdown of METTL14, LPCAT3 overexpression rescue, LPS-induced AKI model in vitro and in vivo","journal":"Molecular genetics and genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Me-RIP and RIP assays directly link METTL14 m6A modification to LPCAT3 mRNA, rescue experiment confirms epistasis, single lab","pmids":["39836248"],"is_preprint":false},{"year":2024,"finding":"IFN-γ-induced STAT1-IRF1 signaling upregulates LPCAT3 expression, and LPCAT3 knockdown impairs ferroptosis induced by mefloquine combined with IFN-γ in melanoma and lung cancer cells, establishing LPCAT3 as a downstream effector of the IFN-γ-STAT1-IRF1 pathway in ferroptosis sensitization.","method":"RNA sequencing, qRT-PCR, western blotting, ChIP-qPCR, LPCAT3 knockdown, cytotoxicity and ferroptosis assays, animal experiments","journal":"Journal for immunotherapy of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR and pathway knockdown with functional ferroptosis readout, single lab","pmids":["38471712"],"is_preprint":false},{"year":2023,"finding":"Coronaviral main protease (Mpro) of PEDV and MERS-CoV (but not HCoV-OC43 or HCoV-HKU1) cleaves LPCAT3 independently of Mpro catalytic activity. LPCAT3 cleavage by Mpro induces ER stress (upregulation of CHOP and GRP78), suggesting a mechanism for gastrointestinal symptoms in coronavirus infections.","method":"Exogenous gene expression of Mpro, protease inhibitor experiments, mutagenesis of Mpro catalytic site, qRT-PCR, gene knockdown, western blotting","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — catalytic mutagenesis and inhibitor experiments confirm cleavage mechanism, with downstream ER stress readout, single lab","pmids":["37632038"],"is_preprint":false},{"year":2024,"finding":"LPCAT3 is the acyltransferase responsible for generating 12-LOX-derived diacyl enzymatically oxygenated phospholipids (eoxPL) in platelets. LPCAT3 inhibition selectively prevented 12-LOX-derived diacyl-eoxPL generation in a cell-free acyltransferase assay, identifying LPCAT3 as a key enzyme in procoagulant phospholipid biosynthesis.","method":"LPCAT3 pharmacological inhibitor, cell-free acyltransferase assay, platelet lipidomics, ASCVD patient cohort platelet measurements","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — cell-free acyltransferase assay directly demonstrates LPCAT3 activity toward eoxPL substrates, supported by cell-based inhibitor data, single lab","pmids":["39674322"],"is_preprint":false},{"year":2025,"finding":"LPCAT3 deficiency in liver (liver-specific knockout) reduces accumulation of oxidized and hydroperoxidized phospholipids and ameliorates acetaminophen-induced acute liver injury, demonstrating that LPCAT3-generated arachidonoyl phospholipids are substrates for oxidative liver injury. LPCAT3 deficiency also promotes APAP detoxification by facilitating glutathione conjugation of NAPQI.","method":"Liver-specific Lpcat3 knockout mice, APAP overdose model, lipidomics (oxidized/hydroperoxidized PL quantification), serum liver injury markers, survival analysis, glutathione conjugation assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with lipidomics, multiple phenotypic readouts, and mechanistic link to both lipid peroxidation and APAP detoxification","pmids":["38019192"],"is_preprint":false},{"year":2022,"finding":"LPCAT3 deficiency in adipocytes increases NOX4 translocation to lipid rafts, facilitating NOX enzyme activity and reactive oxygen species generation, which promotes palmitic acid-induced inflammation and lipolysis. LPCAT3 overexpression has anti-inflammatory and anti-lipolytic effects in adipocytes by reducing membrane polyunsaturated phosphatidylcholine content.","method":"Lpcat3 knockdown and overexpression in 3T3-L1 adipocytes, NOX4 localization by lipid raft fractionation, ROS measurement, lipid profiling, inflammatory cytokine assays","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — lipid raft fractionation plus gain/loss-of-function with mechanistic pathway identification, single lab","pmids":["36331295"],"is_preprint":false},{"year":2025,"finding":"LPCAT3 stabilizes ABCA1 protein through post-translational regulation in chondrocytes. Gene silencing of LPCAT3 downregulates ABCA1 protein through ubiquitination and degradation, which increases intracellular retention of methylprednisolone. LXR agonist T0901317 reverses LPCAT3-induced changes in ABCA1 and steroid retention.","method":"LPCAT3 siRNA in chondrocytes, ABCA1 protein stability assays, ubiquitination assays, intracellular steroid retention measurements, intra-articular siRNA liposome administration in DMM mouse model","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination and protein stability assays identify post-translational mechanism, with in vivo validation in OA model, single lab","pmids":["41072700"],"is_preprint":false},{"year":2025,"finding":"LPCAT3 silencing in endothelial cells inhibits TNFα-induced translocation and ubiquitination of TNFR1-signaling complex into lipid rafts, attenuating NF-κB activation, cell-adhesion molecule synthesis, cytokine production, and leukocyte adhesion. LPCAT3 controls lipid raft composition by incorporating arachidonic acid, and its inhibition results in replacement of AA with EPA/DHA in PC and PE, reducing eicosanoid production.","method":"RNAi-dependent LPCAT3 silencing in endothelial cells, lipid raft isolation, TNFR1 localization assays, NF-κB activation assays, LPCAT3 siRNA lipid nanoparticles in high-fat diet atherosclerosis mouse model","journal":"Inflammation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — lipid raft isolation, receptor localization, and NF-κB pathway analysis in KD cells with in vivo validation, single lab","pmids":["41236634"],"is_preprint":false},{"year":2025,"finding":"LPCAT3 deficiency in liver triggers upregulation of protein disulfide isomerase (Pdi) and endoplasmic reticulum oxidoreductase 1 alpha (Ero1α), leading to mitochondrial accumulation of H2O2 and Ca2+ and impaired mitochondrial oxidative phosphorylation, accelerating MASH-to-HCC progression. Supplementing PC(18:2/18:2) in LPCAT3-knockdown cells reversed Pdi-Ero1α upregulation and alleviated mitochondrial dysfunction.","method":"Liver-specific Lpcat3 knockout mice, MASH-HCC diet model, lipidomics, proteomics, AAV-mediated LPCAT3 overexpression, mitochondrial function assays, PC(18:2/18:2) supplementation rescue experiment","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO and OE models with proteomics/lipidomics and mechanistic rescue experiment, single lab","pmids":["41951050"],"is_preprint":false},{"year":2025,"finding":"LPCAT3 acts as a cold-regulated O-acyltransferase driving selective accumulation of arachidonoyl-phosphatidylethanolamine (AA-PE) in brown adipose tissue mitochondria. AA-PE partitions at the COX4I1 interface of Cytochrome c oxidase, enhancing electron transport chain efficiency. Fat-specific Lpcat3-knockout mice have defective BAT thermogenesis and cold tolerance despite intact β-adrenergic signaling and UCP1 function.","method":"Fat-specific Lpcat3 knockout mice, cold exposure experiments, lipid-based proteomics, molecular dynamics simulations, bioenergetic analyses, mitochondrial fractionation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with lipid-proteomics and molecular dynamics identifying AA-PE/COX4I1 interaction; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2024,"finding":"PPARγ supports hypertrophic expansion of adipose tissue through transcriptional control of LPCAT3, which enriches diet-derived omega-6 PUFAs (particularly arachidonoyl-PE) in the phospholipidome at the ER-lipid droplet interface. Adipocyte-specific Lpcat3 knockout leads to dysfunctional triglyceride storage, aberrant lipolysis, and a futile lipid cycle that increases energy expenditure.","method":"Adipocyte-specific Lpcat3 knockout mice, high-fat diet feeding, lipidomics at ER-lipid droplet interface, ATGL-dependent hydrolysis assays, energy expenditure measurements","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — adipocyte-specific KO with lipidomics and mechanistic identification of ER-lipid droplet interface enrichment; preprint not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"In endometrial stromal cells (hESCs), LPCAT3 knockdown reduces decidualization markers, halts epithelioid-like morphological changes, and decreases PC(16:0-20:4) levels. Reintroducing PC(16:0-20:4) rescues the decidualization defect and premature senescence caused by LPCAT3 knockdown, identifying PC(16:0-20:4) as the key lipid product of LPCAT3 mediating hESC decidualization.","method":"LPCAT3 knockdown and overexpression in hESCs, phospholipid profiling (lipidomics), PC(16:0-20:4) supplementation rescue, decidualization marker quantification, cell cycle analysis, senescence assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with lipid profiling and mechanistic rescue by specific phospholipid, single lab","pmids":["40503597"],"is_preprint":false},{"year":2024,"finding":"SOX4 binds the LPCAT3 promoter and enhances its transcription (confirmed by ChIP and dual-luciferase assay), upregulating LPCAT3 to promote ferroptosis in caerulein-induced acute pancreatitis. LPCAT3 overexpression partially reverses the protective effects of SOX4 knockdown.","method":"ChIP assay, dual-luciferase reporter assay, shRNA-mediated SOX4 knockdown, LPCAT3 overexpression rescue, ferroptosis marker quantification in pancreatic acinar cells","journal":"Digestive diseases and sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase assay with rescue experiment, single lab","pmids":["42217103"],"is_preprint":false}],"current_model":"LPCAT3 (MBOAT5) is an integral membrane O-acyltransferase in the Lands cycle that preferentially incorporates polyunsaturated fatty acids—especially arachidonate (C20:4)—into the sn-2 position of lysophospholipids (including lysophosphatidylcholine, lysophosphatidylethanolamine, and lysophosphatidylserine), thereby remodeling membrane phospholipid composition and controlling membrane biophysical properties, lipoprotein assembly and secretion, lipid absorption, ferroptosis sensitivity (by supplying PUFA-phospholipids for lipid peroxidation), inflammatory eicosanoid production, lipid raft organization, and mitochondrial electron transport chain efficiency; its expression is directly induced by LXR (via a promoter LXRE), PPARγ, and several transcription factors (ZEB/YAP/EP300, USF2, SOX4), and its mRNA is post-transcriptionally regulated by m6A methylation via METTL14."},"narrative":{"mechanistic_narrative":"LPCAT3 is an integral membrane O-acyltransferase that selectively incorporates arachidonate (C20:4) and other polyunsaturated acyl chains into the sn-2 position of lysophospholipids, remodeling membrane phospholipid composition and thereby governing lipoprotein assembly, lipid absorption, membrane biophysics, and lipid peroxidation [PMID:25806685, PMID:35658397]. Its enzymatic output—arachidonoyl phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine—is required for triglyceride secretion and VLDL lipidation, and tissue-specific deletion in intestine reduces polyunsaturated plasma-membrane phosphatidylcholines and surface levels of lipid transporters (NPC1L1, CD36, ABCA1, ABCG8), impairing lipid and cholesterol absorption, while hepatic deletion reduces plasma triglyceride [PMID:25806685, PMID:26828064]. By supplying PUFA-phospholipids as substrates for oxidation, LPCAT3 is a central determinant of ferroptosis sensitivity and of oxidized/hydroperoxidized phospholipid accumulation in tissue injury [PMID:35658397, PMID:38019192]. The same arachidonoyl-phospholipid supply feeds lipid raft organization and inflammatory signaling: LPCAT3 controls raft composition to permit NOX4 activation in adipocytes and TNFR1-complex translocation and NF-κB activation in endothelium, and it generates 12-LOX-derived procoagulant oxygenated phospholipids in platelets [PMID:39674322, PMID:36331295, PMID:41236634]. LPCAT3 expression is directly induced by liver X receptor through a promoter LXRE [PMID:20837115] and by additional transcription factors including the YAP/ZEB/EP300 module, USF2, and SOX4 [PMID:37166352, PMID:40138726, PMID:42217103], and its mRNA is stabilized by METTL14-mediated m6A methylation [PMID:39836248]. Across organs, LPCAT3-generated arachidonoyl/polyunsaturated phospholipids support cellular programs ranging from brown-fat mitochondrial bioenergetics and adipose expansion to endometrial decidualization [PMID:40503597].","teleology":[{"year":2010,"claim":"Established a transcriptional control point for LPCAT3 by showing it is a direct LXR target, linking phospholipid remodeling to sterol/lipid sensing.","evidence":"In silico LXRE search with transactivation and EMSA assays in chicken and human hepatoma cells using LXR agonist T0901317","pmids":["20837115"],"confidence":"High","gaps":["Did not address LPCAT3 enzymatic specificity or in vivo physiological consequence","Other transcription factors not yet examined"]},{"year":2015,"claim":"Defined LPCAT3's core enzymatic role—incorporating arachidonate into membrane phospholipids—and connected it to membrane biophysics and lipoprotein secretion.","evidence":"Intestine- and liver-specific knockout mice with FRAP membrane mobility, lipidomics, and VLDL characterization","pmids":["25806685"],"confidence":"High","gaps":["Structural basis of acyl-chain selectivity not resolved","Direct biochemical reconstitution of substrate preference not shown"]},{"year":2016,"claim":"Identified the mechanistic link between LPCAT3-dependent membrane PUFA content and lipid absorption, showing transporter abundance depends on membrane composition.","evidence":"Inducible intestine- and liver-specific Lpcat3 knockout mice with lipid absorption assays and membrane transporter quantification; hepatic overexpression metabolic studies","pmids":["26828064","27110687"],"confidence":"High","gaps":["How membrane PUFA content controls transporter surface levels mechanistically unclear","Overexpression β-oxidation link from a single lab"]},{"year":2018,"claim":"Connected LPCAT3 activity to cholesterol homeostasis and atherosclerosis, embedding it in the LXR efflux program in macrophages.","evidence":"Lpcat3-/- bone marrow transplantation into Ldlr-/- mice with lipidomics, cholesterol efflux assays, and lesion quantification","pmids":["29866392"],"confidence":"High","gaps":["Direct causal chain from phospholipid changes to efflux defect not fully dissected"]},{"year":2020,"claim":"Demonstrated LPCAT3 acts on phosphatidylserine in the brain and operates in a coordinated cycle with the lyso-PS lipase ABHD12, extending its substrate range beyond PC/PE.","evidence":"Abhd12-/-;Lpcat3-/- double-knockout mice with brain lipidomics, auditory testing, and microgliosis histology","pmids":["32364701"],"confidence":"High","gaps":["Quantitative contribution of LPCAT3 to total brain PS remodeling not isolated"]},{"year":2022,"claim":"Provided pharmacological tools and tied LPCAT3 directly to ferroptosis through its supply of C20:4 phospholipids, while hinting at a homodimeric enzyme architecture.","evidence":"High-throughput enzymatic screening, cell lipidomics versus LPCAT3-null cells, and ferroptosis assays; adipocyte lipid raft fractionation linking LPCAT3 to NOX4 activation","pmids":["35658397","36331295"],"confidence":"High","gaps":["Biphasic inhibition/homodimer model inferred, not structurally confirmed","Only partial ferroptosis protection by inhibition indicates redundant routes"]},{"year":2023,"claim":"Expanded the transcriptional regulatory network with the YAP/ZEB/EP300 module and linked LPCAT3 to ferroptosis sensitization in cancer.","evidence":"ChIP, luciferase reporters, domain-mapping Co-IP, and LPCAT3/ACSL4 perturbation in LUAD cells and xenografts; coronaviral Mpro cleavage assays with catalytic mutagenesis showing ER stress induction","pmids":["37166352","37632038"],"confidence":"Medium","gaps":["Single-lab transcriptional mechanism","Functional consequence of Mpro cleavage on LPCAT3 enzymatic activity not measured"]},{"year":2024,"claim":"Positioned LPCAT3 as a convergent downstream effector across diverse signaling inputs (MALT1/c-Myc, STAT1/IRF1, PPARγ) driving eicosanoid output, ferroptosis, and adipose biology.","evidence":"Chondrocyte and explant MALT1/c-Myc perturbation with DMM model; RNA-seq/ChIP-qPCR in IFN-γ-treated tumor cells; cell-free acyltransferase assay for 12-LOX eoxPL in platelets; adipocyte-specific knockout lipidomics (preprint)","pmids":["38519981","38471712","39674322"],"confidence":"Medium","gaps":["Each pathway documented by a single lab","Direct versus indirect transcriptional control not always distinguished"]},{"year":2025,"claim":"Resolved LPCAT3's product-level mechanisms across organs—oxidized-PL substrates in liver injury, mitochondrial AA-PE bioenergetics, raft-controlled inflammation, ABCA1 stabilization, and PC(16:0-20:4)-dependent decidualization—and added m6A and SOX4/USF2 regulation.","evidence":"Liver-specific knockouts with APAP and MASH-HCC models; Me-RIP/RIP for METTL14 m6A; ChIP/luciferase for USF2 and SOX4; endothelial raft isolation; chondrocyte ubiquitination assays; hESC and BAT (preprint) lipidomic rescue experiments","pmids":["38019192","39836248","40138726","42217103","41236634","41072700","40503597","41951050"],"confidence":"Medium","gaps":["Most organ-specific mechanisms from single labs","Specific phospholipid species mediating each phenotype only partially defined","Cross-tissue generalizability untested"]},{"year":null,"claim":"A high-resolution structure of LPCAT3 explaining acyl-chain selectivity and the proposed homodimeric catalytic behavior, and a unifying account of how a single phospholipid-remodeling enzyme is dialed to opposite outcomes (cytoprotection vs ferroptosis) in different tissues, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No experimental structure in the corpus","Determinants selecting between membrane homeostasis and lipid-peroxidation outcomes not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,4,5,13,19]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[16]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[18,20]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,15,17]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[19]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,9,11,22]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[14,15,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,7,9,22]}],"complexes":[],"partners":["ABCA1","NOX4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6P1A2","full_name":"Lysophospholipid acyltransferase 5","aliases":["1-acylglycerophosphocholine O-acyltransferase","1-acylglycerophosphoethanolamine O-acyltransferase","1-acylglycerophosphoserine O-acyltransferase","Lysophosphatidylcholine acyltransferase","LPCAT","Lyso-PC acyltransferase","Lysophosphatidylcholine acyltransferase 3","Lyso-PC acyltransferase 3","Lysophosphatidylserine acyltransferase","LPSAT","Lyso-PS acyltransferase","Membrane-bound O-acyltransferase domain-containing protein 5","O-acyltransferase domain-containing protein 5"],"length_aa":487,"mass_kda":56.0,"function":"Lysophospholipid O-acyltransferase (LPLAT) that catalyzes the reacylation step of the phospholipid remodeling process also known as the Lands cycle (PubMed:18195019, PubMed:18772128, PubMed:18782225). Catalyzes transfer of the fatty acyl chain from fatty acyl-CoA to 1-acyl lysophospholipid to form various classes of phospholipids. Converts 1-acyl lysophosphatidylcholine (LPC) into phosphatidylcholine (PC) (LPCAT activity), 1-acyl lysophosphatidylserine (LPS) into phosphatidylserine (PS) (LPSAT activity) and 1-acyl lysophosphatidylethanolamine (LPE) into phosphatidylethanolamine (PE) (LPEAT activity) (PubMed:18195019, PubMed:18772128, PubMed:18782225). Favors polyunsaturated fatty acyl-CoAs as acyl donors compared to saturated fatty acyl-CoAs (PubMed:18195019, PubMed:18772128). Has higher activity for LPC acyl acceptors compared to LPEs and LPSs. Can also transfer the fatty acyl chain from fatty acyl-CoA to 1-O-alkyl lysophospholipid or 1-O-alkenyl lysophospholipid with lower efficiency (By similarity). Acts as a major LPC O-acyltransferase in liver and intestine. As a component of the liver X receptor/NR1H3 or NR1H2 signaling pathway, mainly catalyzes the incorporation of arachidonate into PCs of endoplasmic reticulum (ER) membranes, increasing membrane dynamics and enabling triacylglycerols transfer to nascent very low-density lipoprotein (VLDL) particles. Promotes processing of sterol regulatory protein SREBF1 in hepatocytes, likely by facilitating the translocation of SREBF1-SCAP complex from ER to the Golgi apparatus (By similarity). Participates in mechanisms by which the liver X receptor/NR1H3 or NR1H2 signaling pathway counteracts lipid-induced ER stress response and inflammation. Down-regulates hepatic inflammation by limiting arachidonic acid availability for synthesis of inflammatory eicosanoids, such as prostaglandins (By similarity). In enterocytes, acts as a component of a gut-brain feedback loop that coordinates dietary lipid absorption and food intake. Regulates the abundance of PCs containing linoleate and arachidonate in enterocyte membranes, enabling passive diffusion of fatty acids and cholesterol across the membrane for efficient chylomicron assembly (By similarity). In the intestinal crypt, acts as a component of dietary-responsive phospholipid-cholesterol axis, regulating the biosynthesis of cholesterol and its mitogenic effects on intestinal stem cells (By similarity)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q6P1A2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LPCAT3","classification":"Not Classified","n_dependent_lines":56,"n_total_lines":1208,"dependency_fraction":0.046357615894039736},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LPCAT3","total_profiled":1310},"omim":[{"mim_id":"611950","title":"LYSOPHOSPHATIDYLCHOLINE ACYLTRANSFERASE 3; LPCAT3","url":"https://www.omim.org/entry/611950"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low 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into membrane phospholipids and is required for triglyceride secretion. Intestine-specific or liver-specific Lpcat3 knockout mice show reduced plasma triglycerides, enterocyte lipid accumulation, and secretion of lipid-poor VLDL lacking arachidonoyl phospholipids. Mechanistic studies showed that Lpcat3 activity impacts membrane lipid mobility in living cells, providing a biophysical basis for arachidonoyl phospholipid requirements in lipoprotein lipidation.\",\n      \"method\": \"Tissue-specific knockout mice (intestine and liver), fluorescence microscopy for membrane lipid mobility (FRAP), lipidomics, plasma lipid measurements, VLDL characterization\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean tissue-specific KO with defined phenotypic readouts, multiple orthogonal methods (lipid mobility, lipidomics, plasma lipid profiling), and mechanistic follow-up in living cells\",\n      \"pmids\": [\"25806685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Intestine-specific Lpcat3 deficiency significantly reduces polyunsaturated phosphatidylcholines in enterocyte plasma membranes and reduces membrane levels of lipid transporters NPC1L1, CD36, ABCA1, and ABCG8, thereby reducing lipid absorption, cholesterol secretion, and plasma triglyceride, cholesterol, and phospholipid levels. Liver-specific Lpcat3 deficiency only reduces plasma triglyceride without other lipid changes or hepatic lipid accumulation. Small intestinal Lpcat3 deficiency has a dominant effect on plasma lipid metabolism compared to liver deficiency.\",\n      \"method\": \"Inducible intestine-specific (villin-Cre-ER(T2)) and liver-specific (AAV-Cre) Lpcat3 knockout mice, plasma lipid measurements, membrane protein quantification, lipid absorption assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent tissue-specific KO models with multiple quantitative phenotypic readouts, identifying membrane transporter reduction as the mechanistic link\",\n      \"pmids\": [\"26828064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"LPCAT3 is a direct transcriptional target of the liver X receptor (LXR). A functional LXR response element (LXRE) was identified in the LPCAT3 promoter; LXR agonist T0901317 induces LPCAT3 expression in chicken and human hepatoma cells, and transactivation and EMSA assays confirmed direct LXR binding to the LXRE.\",\n      \"method\": \"Transcriptome profiling, in silico LXRE search, transactivation assays, electrophoretic mobility shift assay (EMSA), treatment with LXR agonist T0901317\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — functional promoter assay combined with EMSA demonstrating direct LXR-LXRE binding, replicated in two cell lines\",\n      \"pmids\": [\"20837115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LPCAT3 deficiency in macrophages causes major reductions in arachidonate content of phosphatidylcholines, phosphatidylethanolamines, and plasmalogens, alters cholesterol homeostasis (increased free-to-esterified cholesterol ratio, reduced cholesterol efflux), and inhibits LXR-regulated pathways including decreased Abca1, Abcg1, and ApoE mRNA. Hematopoietic LPCAT3 deficiency accelerates atherosclerosis in Ldlr-/- mice.\",\n      \"method\": \"Lpcat3-/- mice, bone marrow transplantation into Ldlr-/- mice, lipidomics, cholesterol efflux assays, qRT-PCR for LXR target genes, atherosclerotic lesion quantification\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple orthogonal biochemical readouts (lipidomics, cholesterol efflux, gene expression) plus in vivo atherosclerosis model\",\n      \"pmids\": [\"29866392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Small-molecule inhibitors of LPCAT3, discovered by high-throughput screening, inhibit LPCAT3 activity in a biphasic manner possibly reflecting differential activity at each subunit of an LPCAT3 homodimer. These inhibitors cause rapid suppression of C20:4 phospholipids and corresponding increases in C22:4 phospholipids in human cells, mirroring LPCAT3-null cells, and confer partial but incomplete protection from ferroptosis.\",\n      \"method\": \"High-throughput enzymatic screening, cell-based lipid profiling (lipidomics), LPCAT3-null cell comparison, ferroptosis assays\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic inhibition plus cell-based lipidomic validation with genetic controls, multiple orthogonal readouts in one study\",\n      \"pmids\": [\"35658397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LPCAT3 incorporates arachidonoyl (C20:4) chains into phosphatidylserine (PS) in the brain. Genetic deletion of LPCAT3 in mice lacking the lyso-PS lipase ABHD12 blocks accumulation of C20:4 PS in the brain but produces hyper-increases in lyso-PS levels. These lipid changes correlate with exacerbated auditory dysfunction and brain microgliosis in mice lacking both ABHD12 and LPCAT3, revealing that ABHD12 and LPCAT3 coordinately regulate lyso-PS and C20:4 PS in the CNS.\",\n      \"method\": \"Double-knockout mice (Abhd12-/-; Lpcat3-/-), brain lipidomics, auditory function testing, brain microgliosis histology\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using double-KO mice with lipidomics and functional physiological readouts\",\n      \"pmids\": [\"32364701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Liver-specific overexpression of LPCAT3 (converting lysophosphatidylcholine to phosphatidylcholine) alleviates lysophospholipid inhibition of fatty acid β-oxidation in hepatocytes, improves postprandial hyperglycemia and glucose tolerance, reduces VLDL production, and elevates large apoE-rich HDL in plasma.\",\n      \"method\": \"Adenovirus-mediated hepatic overexpression in C57BL/6 mice, glucose tolerance tests after lipid-glucose mixed meal, VLDL/HDL characterization, fatty acid β-oxidation assays in hepatocytes\",\n      \"journal\": \"Nutrition & diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression model with defined metabolic phenotype and mechanistic link to β-oxidation, single lab\",\n      \"pmids\": [\"27110687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LPCAT3 transcription is regulated by YAP, ZEB, and EP300. ZEB directly binds the LPCAT3 promoter in the -1600 to -1401 nt region in a YAP-dependent manner; YAP and ZEB interact via ZEB's zinc-finger cluster domain and YAP's WW domain; EP300 binds YAP via its Bromo domain and ZEB via its CBP/p300-HAT domain, and induces H3K27Ac at the LPCAT3 locus. LPCAT3 and ACSL4 sensitize lung adenocarcinoma cells to ferroptosis.\",\n      \"method\": \"ChIP assays, luciferase reporter assays, domain mutagenesis, Co-IP, LPCAT3/ACSL4 overexpression and knockout in LUAD cell lines and xenograft models\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, reporter assays, Co-IP, and domain mutagenesis from single lab with xenograft validation\",\n      \"pmids\": [\"37166352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MALT1 upregulates LPCAT3 expression in chondrocytes via c-Myc, driving incorporation of arachidonic acid into membranes and subsequent eicosanoid production, MMP3 and ADAMTS5 expression, and cytokine secretion. Pharmacological inhibition of MALT1 or siRNA knockdown of LPCAT3 suppresses IL-1β-induced cartilage catabolism and attenuates osteoarthritis in a mouse DMM model.\",\n      \"method\": \"MALT1 overexpression/pharmacological inhibition in chondrocytes and human cartilage explants, LPCAT3 siRNA-lipid nanoparticles, c-Myc inhibition, DMM mouse model, cytokine/eicosanoid measurements\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological perturbations with defined molecular pathway (MALT1-c-Myc-LPCAT3) and in vivo validation, single lab\",\n      \"pmids\": [\"38519981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LPCAT3 is transcriptionally regulated by USF2 in the context of sepsis-induced acute kidney injury. USF2 binds the LPCAT3 promoter (confirmed by ChIP-qPCR and dual-luciferase assay) to upregulate LPCAT3, which promotes ferroptosis via the NRF2/HO-1/GPX4 pathway. LPCAT3 knockdown in vivo ameliorates sepsis-AKI.\",\n      \"method\": \"ChIP-qPCR, dual-luciferase reporter assay, LPCAT3 knockdown (siRNA and AAV-shRNA in vivo), LPS-induced AKI model, ferroptosis marker quantification\",\n      \"journal\": \"Shock\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcription factor binding confirmed by ChIP and luciferase assay, with in vivo validation, single lab\",\n      \"pmids\": [\"40138726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"METTL14 (an m6A writer) promotes LPCAT3 mRNA m6A methylation, increasing LPCAT3 mRNA stability and expression, which drives ferroptosis in sepsis-induced AKI. METTL14 knockdown reduces m6A and mRNA levels of LPCAT3, and LPCAT3 overexpression reverses the ferroptosis-protective effects of METTL14 silencing.\",\n      \"method\": \"Me-RIP assay for m6A on LPCAT3 mRNA, RIP assay, dual-luciferase reporter assay, siRNA knockdown of METTL14, LPCAT3 overexpression rescue, LPS-induced AKI model in vitro and in vivo\",\n      \"journal\": \"Molecular genetics and genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Me-RIP and RIP assays directly link METTL14 m6A modification to LPCAT3 mRNA, rescue experiment confirms epistasis, single lab\",\n      \"pmids\": [\"39836248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IFN-γ-induced STAT1-IRF1 signaling upregulates LPCAT3 expression, and LPCAT3 knockdown impairs ferroptosis induced by mefloquine combined with IFN-γ in melanoma and lung cancer cells, establishing LPCAT3 as a downstream effector of the IFN-γ-STAT1-IRF1 pathway in ferroptosis sensitization.\",\n      \"method\": \"RNA sequencing, qRT-PCR, western blotting, ChIP-qPCR, LPCAT3 knockdown, cytotoxicity and ferroptosis assays, animal experiments\",\n      \"journal\": \"Journal for immunotherapy of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR and pathway knockdown with functional ferroptosis readout, single lab\",\n      \"pmids\": [\"38471712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Coronaviral main protease (Mpro) of PEDV and MERS-CoV (but not HCoV-OC43 or HCoV-HKU1) cleaves LPCAT3 independently of Mpro catalytic activity. LPCAT3 cleavage by Mpro induces ER stress (upregulation of CHOP and GRP78), suggesting a mechanism for gastrointestinal symptoms in coronavirus infections.\",\n      \"method\": \"Exogenous gene expression of Mpro, protease inhibitor experiments, mutagenesis of Mpro catalytic site, qRT-PCR, gene knockdown, western blotting\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic mutagenesis and inhibitor experiments confirm cleavage mechanism, with downstream ER stress readout, single lab\",\n      \"pmids\": [\"37632038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LPCAT3 is the acyltransferase responsible for generating 12-LOX-derived diacyl enzymatically oxygenated phospholipids (eoxPL) in platelets. LPCAT3 inhibition selectively prevented 12-LOX-derived diacyl-eoxPL generation in a cell-free acyltransferase assay, identifying LPCAT3 as a key enzyme in procoagulant phospholipid biosynthesis.\",\n      \"method\": \"LPCAT3 pharmacological inhibitor, cell-free acyltransferase assay, platelet lipidomics, ASCVD patient cohort platelet measurements\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — cell-free acyltransferase assay directly demonstrates LPCAT3 activity toward eoxPL substrates, supported by cell-based inhibitor data, single lab\",\n      \"pmids\": [\"39674322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LPCAT3 deficiency in liver (liver-specific knockout) reduces accumulation of oxidized and hydroperoxidized phospholipids and ameliorates acetaminophen-induced acute liver injury, demonstrating that LPCAT3-generated arachidonoyl phospholipids are substrates for oxidative liver injury. LPCAT3 deficiency also promotes APAP detoxification by facilitating glutathione conjugation of NAPQI.\",\n      \"method\": \"Liver-specific Lpcat3 knockout mice, APAP overdose model, lipidomics (oxidized/hydroperoxidized PL quantification), serum liver injury markers, survival analysis, glutathione conjugation assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with lipidomics, multiple phenotypic readouts, and mechanistic link to both lipid peroxidation and APAP detoxification\",\n      \"pmids\": [\"38019192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LPCAT3 deficiency in adipocytes increases NOX4 translocation to lipid rafts, facilitating NOX enzyme activity and reactive oxygen species generation, which promotes palmitic acid-induced inflammation and lipolysis. LPCAT3 overexpression has anti-inflammatory and anti-lipolytic effects in adipocytes by reducing membrane polyunsaturated phosphatidylcholine content.\",\n      \"method\": \"Lpcat3 knockdown and overexpression in 3T3-L1 adipocytes, NOX4 localization by lipid raft fractionation, ROS measurement, lipid profiling, inflammatory cytokine assays\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — lipid raft fractionation plus gain/loss-of-function with mechanistic pathway identification, single lab\",\n      \"pmids\": [\"36331295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LPCAT3 stabilizes ABCA1 protein through post-translational regulation in chondrocytes. Gene silencing of LPCAT3 downregulates ABCA1 protein through ubiquitination and degradation, which increases intracellular retention of methylprednisolone. LXR agonist T0901317 reverses LPCAT3-induced changes in ABCA1 and steroid retention.\",\n      \"method\": \"LPCAT3 siRNA in chondrocytes, ABCA1 protein stability assays, ubiquitination assays, intracellular steroid retention measurements, intra-articular siRNA liposome administration in DMM mouse model\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination and protein stability assays identify post-translational mechanism, with in vivo validation in OA model, single lab\",\n      \"pmids\": [\"41072700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LPCAT3 silencing in endothelial cells inhibits TNFα-induced translocation and ubiquitination of TNFR1-signaling complex into lipid rafts, attenuating NF-κB activation, cell-adhesion molecule synthesis, cytokine production, and leukocyte adhesion. LPCAT3 controls lipid raft composition by incorporating arachidonic acid, and its inhibition results in replacement of AA with EPA/DHA in PC and PE, reducing eicosanoid production.\",\n      \"method\": \"RNAi-dependent LPCAT3 silencing in endothelial cells, lipid raft isolation, TNFR1 localization assays, NF-κB activation assays, LPCAT3 siRNA lipid nanoparticles in high-fat diet atherosclerosis mouse model\",\n      \"journal\": \"Inflammation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — lipid raft isolation, receptor localization, and NF-κB pathway analysis in KD cells with in vivo validation, single lab\",\n      \"pmids\": [\"41236634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LPCAT3 deficiency in liver triggers upregulation of protein disulfide isomerase (Pdi) and endoplasmic reticulum oxidoreductase 1 alpha (Ero1α), leading to mitochondrial accumulation of H2O2 and Ca2+ and impaired mitochondrial oxidative phosphorylation, accelerating MASH-to-HCC progression. Supplementing PC(18:2/18:2) in LPCAT3-knockdown cells reversed Pdi-Ero1α upregulation and alleviated mitochondrial dysfunction.\",\n      \"method\": \"Liver-specific Lpcat3 knockout mice, MASH-HCC diet model, lipidomics, proteomics, AAV-mediated LPCAT3 overexpression, mitochondrial function assays, PC(18:2/18:2) supplementation rescue experiment\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO and OE models with proteomics/lipidomics and mechanistic rescue experiment, single lab\",\n      \"pmids\": [\"41951050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LPCAT3 acts as a cold-regulated O-acyltransferase driving selective accumulation of arachidonoyl-phosphatidylethanolamine (AA-PE) in brown adipose tissue mitochondria. AA-PE partitions at the COX4I1 interface of Cytochrome c oxidase, enhancing electron transport chain efficiency. Fat-specific Lpcat3-knockout mice have defective BAT thermogenesis and cold tolerance despite intact β-adrenergic signaling and UCP1 function.\",\n      \"method\": \"Fat-specific Lpcat3 knockout mice, cold exposure experiments, lipid-based proteomics, molecular dynamics simulations, bioenergetic analyses, mitochondrial fractionation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with lipid-proteomics and molecular dynamics identifying AA-PE/COX4I1 interaction; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PPARγ supports hypertrophic expansion of adipose tissue through transcriptional control of LPCAT3, which enriches diet-derived omega-6 PUFAs (particularly arachidonoyl-PE) in the phospholipidome at the ER-lipid droplet interface. Adipocyte-specific Lpcat3 knockout leads to dysfunctional triglyceride storage, aberrant lipolysis, and a futile lipid cycle that increases energy expenditure.\",\n      \"method\": \"Adipocyte-specific Lpcat3 knockout mice, high-fat diet feeding, lipidomics at ER-lipid droplet interface, ATGL-dependent hydrolysis assays, energy expenditure measurements\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — adipocyte-specific KO with lipidomics and mechanistic identification of ER-lipid droplet interface enrichment; preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In endometrial stromal cells (hESCs), LPCAT3 knockdown reduces decidualization markers, halts epithelioid-like morphological changes, and decreases PC(16:0-20:4) levels. Reintroducing PC(16:0-20:4) rescues the decidualization defect and premature senescence caused by LPCAT3 knockdown, identifying PC(16:0-20:4) as the key lipid product of LPCAT3 mediating hESC decidualization.\",\n      \"method\": \"LPCAT3 knockdown and overexpression in hESCs, phospholipid profiling (lipidomics), PC(16:0-20:4) supplementation rescue, decidualization marker quantification, cell cycle analysis, senescence assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with lipid profiling and mechanistic rescue by specific phospholipid, single lab\",\n      \"pmids\": [\"40503597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX4 binds the LPCAT3 promoter and enhances its transcription (confirmed by ChIP and dual-luciferase assay), upregulating LPCAT3 to promote ferroptosis in caerulein-induced acute pancreatitis. LPCAT3 overexpression partially reverses the protective effects of SOX4 knockdown.\",\n      \"method\": \"ChIP assay, dual-luciferase reporter assay, shRNA-mediated SOX4 knockdown, LPCAT3 overexpression rescue, ferroptosis marker quantification in pancreatic acinar cells\",\n      \"journal\": \"Digestive diseases and sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase assay with rescue experiment, single lab\",\n      \"pmids\": [\"42217103\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LPCAT3 (MBOAT5) is an integral membrane O-acyltransferase in the Lands cycle that preferentially incorporates polyunsaturated fatty acids—especially arachidonate (C20:4)—into the sn-2 position of lysophospholipids (including lysophosphatidylcholine, lysophosphatidylethanolamine, and lysophosphatidylserine), thereby remodeling membrane phospholipid composition and controlling membrane biophysical properties, lipoprotein assembly and secretion, lipid absorption, ferroptosis sensitivity (by supplying PUFA-phospholipids for lipid peroxidation), inflammatory eicosanoid production, lipid raft organization, and mitochondrial electron transport chain efficiency; its expression is directly induced by LXR (via a promoter LXRE), PPARγ, and several transcription factors (ZEB/YAP/EP300, USF2, SOX4), and its mRNA is post-transcriptionally regulated by m6A methylation via METTL14.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LPCAT3 is an integral membrane O-acyltransferase that selectively incorporates arachidonate (C20:4) and other polyunsaturated acyl chains into the sn-2 position of lysophospholipids, remodeling membrane phospholipid composition and thereby governing lipoprotein assembly, lipid absorption, membrane biophysics, and lipid peroxidation [#0, #4]. Its enzymatic output—arachidonoyl phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine—is required for triglyceride secretion and VLDL lipidation, and tissue-specific deletion in intestine reduces polyunsaturated plasma-membrane phosphatidylcholines and surface levels of lipid transporters (NPC1L1, CD36, ABCA1, ABCG8), impairing lipid and cholesterol absorption, while hepatic deletion reduces plasma triglyceride [#0, #1]. By supplying PUFA-phospholipids as substrates for oxidation, LPCAT3 is a central determinant of ferroptosis sensitivity and of oxidized/hydroperoxidized phospholipid accumulation in tissue injury [#4, #14]. The same arachidonoyl-phospholipid supply feeds lipid raft organization and inflammatory signaling: LPCAT3 controls raft composition to permit NOX4 activation in adipocytes and TNFR1-complex translocation and NF-κB activation in endothelium, and it generates 12-LOX-derived procoagulant oxygenated phospholipids in platelets [#13, #15, #17]. LPCAT3 expression is directly induced by liver X receptor through a promoter LXRE [#2] and by additional transcription factors including the YAP/ZEB/EP300 module, USF2, and SOX4 [#7, #9, #22], and its mRNA is stabilized by METTL14-mediated m6A methylation [#10]. Across organs, LPCAT3-generated arachidonoyl/polyunsaturated phospholipids support cellular programs ranging from brown-fat mitochondrial bioenergetics and adipose expansion to endometrial decidualization [#19, #20, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established a transcriptional control point for LPCAT3 by showing it is a direct LXR target, linking phospholipid remodeling to sterol/lipid sensing.\",\n      \"evidence\": \"In silico LXRE search with transactivation and EMSA assays in chicken and human hepatoma cells using LXR agonist T0901317\",\n      \"pmids\": [\"20837115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address LPCAT3 enzymatic specificity or in vivo physiological consequence\", \"Other transcription factors not yet examined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined LPCAT3's core enzymatic role—incorporating arachidonate into membrane phospholipids—and connected it to membrane biophysics and lipoprotein secretion.\",\n      \"evidence\": \"Intestine- and liver-specific knockout mice with FRAP membrane mobility, lipidomics, and VLDL characterization\",\n      \"pmids\": [\"25806685\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of acyl-chain selectivity not resolved\", \"Direct biochemical reconstitution of substrate preference not shown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified the mechanistic link between LPCAT3-dependent membrane PUFA content and lipid absorption, showing transporter abundance depends on membrane composition.\",\n      \"evidence\": \"Inducible intestine- and liver-specific Lpcat3 knockout mice with lipid absorption assays and membrane transporter quantification; hepatic overexpression metabolic studies\",\n      \"pmids\": [\"26828064\", \"27110687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How membrane PUFA content controls transporter surface levels mechanistically unclear\", \"Overexpression β-oxidation link from a single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected LPCAT3 activity to cholesterol homeostasis and atherosclerosis, embedding it in the LXR efflux program in macrophages.\",\n      \"evidence\": \"Lpcat3-/- bone marrow transplantation into Ldlr-/- mice with lipidomics, cholesterol efflux assays, and lesion quantification\",\n      \"pmids\": [\"29866392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct causal chain from phospholipid changes to efflux defect not fully dissected\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated LPCAT3 acts on phosphatidylserine in the brain and operates in a coordinated cycle with the lyso-PS lipase ABHD12, extending its substrate range beyond PC/PE.\",\n      \"evidence\": \"Abhd12-/-;Lpcat3-/- double-knockout mice with brain lipidomics, auditory testing, and microgliosis histology\",\n      \"pmids\": [\"32364701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of LPCAT3 to total brain PS remodeling not isolated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided pharmacological tools and tied LPCAT3 directly to ferroptosis through its supply of C20:4 phospholipids, while hinting at a homodimeric enzyme architecture.\",\n      \"evidence\": \"High-throughput enzymatic screening, cell lipidomics versus LPCAT3-null cells, and ferroptosis assays; adipocyte lipid raft fractionation linking LPCAT3 to NOX4 activation\",\n      \"pmids\": [\"35658397\", \"36331295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biphasic inhibition/homodimer model inferred, not structurally confirmed\", \"Only partial ferroptosis protection by inhibition indicates redundant routes\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Expanded the transcriptional regulatory network with the YAP/ZEB/EP300 module and linked LPCAT3 to ferroptosis sensitization in cancer.\",\n      \"evidence\": \"ChIP, luciferase reporters, domain-mapping Co-IP, and LPCAT3/ACSL4 perturbation in LUAD cells and xenografts; coronaviral Mpro cleavage assays with catalytic mutagenesis showing ER stress induction\",\n      \"pmids\": [\"37166352\", \"37632038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab transcriptional mechanism\", \"Functional consequence of Mpro cleavage on LPCAT3 enzymatic activity not measured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Positioned LPCAT3 as a convergent downstream effector across diverse signaling inputs (MALT1/c-Myc, STAT1/IRF1, PPARγ) driving eicosanoid output, ferroptosis, and adipose biology.\",\n      \"evidence\": \"Chondrocyte and explant MALT1/c-Myc perturbation with DMM model; RNA-seq/ChIP-qPCR in IFN-γ-treated tumor cells; cell-free acyltransferase assay for 12-LOX eoxPL in platelets; adipocyte-specific knockout lipidomics (preprint)\",\n      \"pmids\": [\"38519981\", \"38471712\", \"39674322\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each pathway documented by a single lab\", \"Direct versus indirect transcriptional control not always distinguished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved LPCAT3's product-level mechanisms across organs—oxidized-PL substrates in liver injury, mitochondrial AA-PE bioenergetics, raft-controlled inflammation, ABCA1 stabilization, and PC(16:0-20:4)-dependent decidualization—and added m6A and SOX4/USF2 regulation.\",\n      \"evidence\": \"Liver-specific knockouts with APAP and MASH-HCC models; Me-RIP/RIP for METTL14 m6A; ChIP/luciferase for USF2 and SOX4; endothelial raft isolation; chondrocyte ubiquitination assays; hESC and BAT (preprint) lipidomic rescue experiments\",\n      \"pmids\": [\"38019192\", \"39836248\", \"40138726\", \"42217103\", \"41236634\", \"41072700\", \"40503597\", \"41951050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most organ-specific mechanisms from single labs\", \"Specific phospholipid species mediating each phenotype only partially defined\", \"Cross-tissue generalizability untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of LPCAT3 explaining acyl-chain selectivity and the proposed homodimeric catalytic behavior, and a unifying account of how a single phospholipid-remodeling enzyme is dialed to opposite outcomes (cytoprotection vs ferroptosis) in different tissues, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimental structure in the corpus\", \"Determinants selecting between membrane homeostasis and lipid-peroxidation outcomes not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 4, 5, 13, 19]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [18, 20]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 15, 17]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 9, 11, 22]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [14, 15, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 7, 9, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ABCA1\", \"NOX4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}