{"gene":"ANGPTL8","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2013,"finding":"ANGPTL8 is required for the metabolic transition between fasting and refeeding; knockout mice show reduced VLDL secretion and increased LPL activity in the fed state, with impaired fatty acid uptake specifically in adipose tissue but preserved uptake in heart, demonstrating a tissue-selective role in directing dietary TG to adipose storage.","method":"Angptl8 knockout mouse model, LPL activity assays, VLDL secretion assays, tissue lipid uptake measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple orthogonal metabolic phenotype readouts, foundational paper with 281 citations","pmids":["24043787"],"is_preprint":false},{"year":2012,"finding":"ANGPTL8 (RIFL) is an insulin-regulated gene whose knockdown during adipogenesis reduces adipocyte triglyceride content by ~35%, and whose expression is induced >100-fold during adipogenesis and by refeeding in fat and liver, indicating a prolipogenic function.","method":"siRNA knockdown in 3T3-L1 adipocytes, triglyceride content measurement, Angptl8-null mouse model, transcriptional profiling","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD + KO + expression profiling), foundational paper with 266 citations","pmids":["22569073"],"is_preprint":false},{"year":2017,"finding":"ANGPTL8 possesses a functional LPL inhibitory motif but requires ANGPTL3 expression to inhibit LPL and elevate plasma TG; ANGPTL3 activity is not required for its ability to activate ANGPTL8, and the ANGPTL3-ANGPTL8 complex is far more efficacious at raising TG than ANGPTL3 alone. An antibody to the C-terminus of ANGPTL8 blocks LPL inhibition without disrupting the complex.","method":"Co-expression in mouse models, mutated ANGPTL3 (LPL-inhibitory activity ablated), monoclonal antibody blockade, in vivo TG measurements","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 — multiple in vivo genetic and antibody approaches, replicated with complementary data from Chi et al. 2017","pmids":["28413163"],"is_preprint":false},{"year":2017,"finding":"ANGPTL8 physically binds ANGPTL3 (detected by Co-IP and NanoBiT split-luciferase); the ANGPTL3-ANGPTL8 complex dramatically increases ANGPTL3's ability to bind LPL compared to either protein alone, and co-expression with ANGPTL3 greatly enhances ANGPTL8 secretion. Adenoviral overexpression of ANGPTL3 raises plasma TG only in the presence of ANGPTL8.","method":"Co-immunoprecipitation, NanoBiT split-luciferase protein interaction assay, lipase activity assays, adenovirus injection in Angptl8-null mice","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 1/2 — reconstituted complex in cells, multiple orthogonal binding and activity assays, genetic epistasis in vivo","pmids":["29031715"],"is_preprint":false},{"year":2017,"finding":"Intracellular ANGPTL8 functions as a negative feedback regulator of TNFα-triggered NF-κB activation by facilitating the interaction of IKKγ with p62/SQSTM1 to promote selective autophagic degradation of IKKγ; N-terminal domain-mediated self-oligomerization of ANGPTL8 is essential for this activity.","method":"Knockdown/knockout of ANGPTL8 in cell lines, Co-IP, autophagic flux assays, domain mutagenesis, LPS-injected mouse model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, domain mutagenesis, in vitro and in vivo validation with orthogonal methods","pmids":["29255244"],"is_preprint":false},{"year":2020,"finding":"Hepatic ANGPTL8 acts endocrinally (with ANGPTL3) to inhibit intravascular LPL in oxidative tissues, whereas adipose-tissue ANGPTL8 acts autocrine/paracrinely to inhibit ANGPTL4 and thereby enhance local LPL activity; co-expression of ANGPTL8 with ANGPTL4 in cultured cells reduces ANGPTL4 secretion and ANGPTL4-mediated LPL inhibition.","method":"Liver-specific and adipose-specific Angptl8 knockout mice, plasma TG and LPL activity assays, cell-based ANGPTL4 secretion assays","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with defined phenotypic readouts and cell-based mechanistic follow-up","pmids":["32730227"],"is_preprint":false},{"year":2019,"finding":"ANGPTL8 resets diurnal rhythms of hepatic clock and metabolic genes in mice through signaling via membrane receptor PirB (LILRB), phosphorylation of downstream kinases and transcription factors, and transient activation of the clock gene Per1; inhibition of ANGPTL8 signaling partially blocks food-entrained resetting of the liver clock.","method":"Angptl8 knockout and overexpression in mice, PirB blocking, gene expression profiling, circadian rhythm analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genetic KO combined with receptor blocking and epistasis analysis in vivo","pmids":["31388006"],"is_preprint":false},{"year":2014,"finding":"ANGPTL8 does not control pancreatic beta cell expansion; Angptl8-null mice undergo normal beta cell expansion in response to insulin resistance from high-fat diet or S961 administration, and liver overexpression of ANGPTL8 doubles plasma TG but does not alter beta cell expansion or glucose metabolism.","method":"Angptl8 knockout mice, high-fat diet and S961 insulin resistance models, beta cell quantification, hepatic overexpression","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — clean KO and OE with rigorous beta cell proliferation readouts, 178 citations, replicated by multiple labs","pmids":["25417115"],"is_preprint":false},{"year":2015,"finding":"A monoclonal antibody targeting the EIQVEE epitope of ANGPTL8 (Lipasin) lowers serum TG in mice; Lipasin-deficient mice show elevated postprandial LPL activity specifically in heart and skeletal muscle but not white adipose tissue, indicating lipasin suppresses LPL in cardiac/skeletal muscle to redirect circulating TG to adipose tissue in the fed state.","method":"Monoclonal antibody generation and injection, Lipasin-deficient mouse model, tissue LPL activity assays, fed/fasted TG measurements","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — KO model combined with antibody blockade and tissue-specific LPL activity measurements","pmids":["26687026"],"is_preprint":false},{"year":2018,"finding":"HCC-associated protein TD26 (ANGPTL8) interacts via its C-terminus (aa 121–198) with the truncated nuclear form of SREBP1 (nSREBP1) but not full-length SREBP1, blocking AMPK-mediated inhibition of SREBP1 activity, thereby increasing lipogenesis and promoting tumor cell proliferation.","method":"Co-immunoprecipitation, domain truncation mapping, AMPK inhibition assays, metabolomics, in vitro and in vivo tumor growth assays","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 1/2 — defined binding domain by truncation + Co-IP, mechanistic rescue with SREBP1 dependence, functional in vivo validation","pmids":["29663480"],"is_preprint":false},{"year":2022,"finding":"ANGPTL8 accelerates hepatic stellate cell activation and liver fibrosis by interacting with the LILRB2 receptor to induce ERK signaling and upregulate profibrotic gene expression; liver-derived ANGPTL8 was confirmed as the active source by AAV8-mediated liver-specific restoration in KO mice.","method":"ANGPTL8 KO mice (HFD, HFHC, CCL4 models), AAV8 liver restoration, Co-IP, protein array, RNA-seq, histology","journal":"Journal of advanced research","confidence":"High","confidence_rationale":"Tier 2 — KO with tissue-specific rescue, receptor identification by Co-IP and signaling pathway validation","pmids":["36031141"],"is_preprint":false},{"year":2022,"finding":"ANGPTL8 serves as a negative regulator of pathological cardiac hypertrophy by directly binding to LILRB3 (PirB) and inhibiting Akt/GSK3β activation; ANGPTL8 deficiency accelerates Ang II- or TAC-induced cardiac hypertrophy, while recombinant ANGPTL8 protein attenuates cardiomyocyte enlargement in vitro.","method":"ANGPTL8 KO mice (Ang II and TAC models), recombinant protein treatment in primary cardiomyocytes, RNA-seq, immunoprecipitation-mass spectrometry, siRNA-LILRB3 and anti-LILRB3 blocking","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — KO with defined phenotype, receptor identified by IP-MS, confirmed by siRNA and blocking antibody, Akt activator rescue","pmids":["35851270"],"is_preprint":false},{"year":2018,"finding":"ANGPTL8 antisense oligonucleotide treatment in high-fat-fed rats increases postprandial TG uptake in white adipose tissue, prevents hepatic steatosis, inhibits PKCε activation, and rescues hepatic insulin resistance, positioning adipose-tissue LPL disinhibition as the mechanistic basis.","method":"ASO knockdown in rats and mice, hyperinsulinemic-euglycaemic clamps, tissue lipid content, PKCε activation, Akt phosphorylation assays, meal tolerance tests","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 — pharmacological KD with mechanistic pathway readouts (PKCε, Akt), in vivo clamp studies","pmids":["29497783"],"is_preprint":false},{"year":2017,"finding":"ANGPTL8 knockdown in 3T3-L1 adipocytes enhances intracellular lipolysis (increased NEFA release) and upregulates Angptl4, Leptin, Cpt1a, Cpt1b, and Pgc-1α; it also alters cellular phospholipid composition (reduces alkyl-PCs and PE plasmalogens), indicating that ANGPTL8 acts to suppress intracellular lipolysis and regulate the cellular lipidome.","method":"Lentiviral shRNA knockdown in 3T3-L1 adipocytes, lipolysis assays, lipidomics, gene expression analysis","journal":"Chemistry and physics of lipids","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with multiple orthogonal readouts in a single lab","pmids":["28528274"],"is_preprint":false},{"year":2016,"finding":"ANGPTL8 overexpression in HepG2 cells enhances insulin-stimulated Akt-GSK3β and Akt-FoxO1 phosphorylation regardless of insulin resistance status; knockout of ANGPTL8 attenuates these pathways specifically under insulin resistance conditions, suggesting ANGPTL8 activates insulin signaling via the PI3K/Akt axis.","method":"TALEN-mediated KO and stable overexpression in HepG2 cells, western blot of Akt/GSK3β/FoxO1 phosphorylation under normal and insulin-resistant conditions","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — defined cellular mechanism with KO and OE comparison, but single lab","pmids":["26387753"],"is_preprint":false},{"year":2020,"finding":"ANGPTL8 enhances insulin sensitivity by directly activating AKT phosphorylation in the insulin-mediated PI3K/AKT signaling pathway; Ser94 and Thr98 on ANGPTL8 are the key residues required for AKT activation, identified by point mutation and fragment truncation analysis.","method":"Hydrodynamic tail vein transfection in mice, siRNA knockdown and in vitro mRNA overexpression in primary hepatocytes, site-directed mutagenesis, western blot of AKT phosphorylation","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 1/2 — mutagenesis identifying key residues combined with in vivo and in vitro validation, but single lab","pmids":["32344005"],"is_preprint":false},{"year":2016,"finding":"ANGPTL8 (RIFL) expression is suppressed by lipolytic stimuli (β-adrenergic agonist isoproterenol, adenylate cyclase activator forskolin) and modestly reduces TG content when knocked down; a >8-fold increase in ANGPTL8 expression is seen in WAT of ob/ob mice and ~80-fold after refeeding, consistent with its role as an insulin/refeeding-induced LPL regulator.","method":"Angptl8 KO mice, 3T3-L1 adipocyte knockdown, pharmacological stimulation, gene expression, TG content measurement","journal":"Scientific reports (Dang et al.)","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, partially mechanistic, but consistent with multiple other reports","pmids":["27845381"],"is_preprint":false},{"year":2015,"finding":"ANGPTL8 expression in hepatocytes is regulated by the LXR/SREBP-1 signaling pathway; LXR agonist T0901317, palmitic acid, and tunicamycin all upregulate ANGPTL8 expression, while AICAR (AMPK activator) suppresses LXR/SREBP-1-induced ANGPTL8 expression through PPARα phosphorylation.","method":"HepG2 cell pharmacological treatments, siRNA for SREBP-1, gene expression analysis, AICAR and PPARα inhibitor experiments","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple pharmacological and siRNA approaches establishing pathway, but single lab","pmids":["26254015"],"is_preprint":false},{"year":2020,"finding":"Insulin acutely induces Angptl8 expression in liver and adipose tissue via the CCAAT/enhancer-binding protein (C/EBPβ) transcription factor; glucose further enhances adipose Angptl8 expression in the presence of insulin; AMPK activation antagonizes insulin-stimulated Angptl8 expression in hepatocytes and adipocytes.","method":"In vivo insulin clamp experiments in mice, primary hepatocyte and adipocyte cultures, C/EBPβ identification, luciferase reporter assays, AMPK pathway inhibition","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo clamping plus in vitro reporter assays identifying C/EBPβ as transcriptional mediator","pmids":["32154742"],"is_preprint":false},{"year":2020,"finding":"Transcriptional regulation of Angptl8 in the liver is mediated by HNF-1α/β binding to a defined site (-84/-68 bp) in the Angptl8 promoter; HNF-1α binding is confirmed by EMSA and ChIP, and HNF-1α levels increase rapidly after refeeding in parallel with Angptl8 expression; insulin-induced Angptl8 upregulation is completely abolished by HNF-1 knockdown.","method":"Promoter deletion/mutation analysis, luciferase reporter assay, EMSA, ChIP, HNF-1 siRNA in hepatoma cells and primary hepatocytes","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 — direct binding confirmed by EMSA and ChIP, promoter mutagenesis, in vitro and in vivo validation","pmids":["32561878"],"is_preprint":false},{"year":2017,"finding":"MicroRNA-221-3p targets the ANGPTL8 mRNA 3'UTR to reduce ANGPTL8 protein expression in adipocytes; inflammatory macrophage-conditioned medium induces miR-221-3p which suppresses ANGPTL8 expression, linking adipose inflammation to reduced ANGPTL8 levels.","method":"miR-221-3p mimic/inhibitor transfection in human adipocytes, 3'UTR luciferase reporter assay, subcutaneous adipose tissue biopsies from lean to obese subjects","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3'UTR targeting validated by reporter assay plus gain/loss-of-function in adipocytes, replicated in tissue biopsies","pmids":["28938482"],"is_preprint":false},{"year":2022,"finding":"The ANGPTL3-ANGPTL8 complex targets both LPL and endothelial lipase (EL/LIPG) in humans; genetic mimicry analysis shows the R59W substitution in ANGPTL8 more strongly affects EL inhibition than LPL inhibition, while a rare protein-truncating ANGPTL8 variant shows the complex to be LPL-specific.","method":"Human genetic mimicry analysis using UK Biobank (>110,000 individuals) and 11 European population cohorts, variant-specific metabolite profiling","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — large-scale human genetic epistasis identifying specific lipase targets, but no direct enzymatic assay","pmids":["36372100"],"is_preprint":false},{"year":2024,"finding":"ANGPTL8 in the diabetic brain is secreted by neurons into the hippocampus and acts via its receptor PirB (LILRB) on both neurons and microglia; in neurons it downregulates synaptic and axonal markers, in microglia it upregulates proinflammatory cytokines, collectively causing neuroinflammation and synaptic loss; neuron-specific Angptl8 KO prevents these effects.","method":"Neuron-specific Angptl8 KO mice, PirB-/- mice, recombinant ANGPTL8 protein treatment, Barnes Maze and novel object recognition, synaptic marker assays, cytokine measurement","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 — tissue-specific KO and receptor KO with behavioral and molecular readouts, mechanistic pathway validated","pmids":["39095838"],"is_preprint":false},{"year":2018,"finding":"ANGPTL8 knockdown in primary mouse subcutaneous preadipocytes impedes adipocyte differentiation, reduces TG accumulation, attenuates isoproterenol-stimulated lipolysis, and reduces early expression of adipogenic genes (PPARγ) and insulin signaling genes, as well as decreasing insulin-stimulated Akt phosphorylation at early differentiation.","method":"siRNA knockdown, RNA-seq at multiple differentiation time points, Akt phosphorylation western blot, lipolysis assays in primary preadipocytes","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 — RNA-seq plus targeted signaling assays in primary cells, but single lab","pmids":["38272177"],"is_preprint":false},{"year":2024,"finding":"ANGPTL8 deficiency attenuates LPS-induced liver injury by activating the PGC1α/PPARα pathway to improve fatty acid oxidation; LPS promotes ANGPTL8 expression via TNF-α, and Angptl8 KO reduces hepatic lipid accumulation and lipid peroxidation, improving survival in septic mice.","method":"Angptl8 KO mice, LPS-induced liver injury model, TNF-α pathway inhibition, PGC1α/PPARα pathway analysis, survival studies","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined pathway (PGC1α/PPARα), TNF-α epistasis, and survival outcome","pmids":["39019343"],"is_preprint":false},{"year":2016,"finding":"ANGPTL8 siRNA knockdown in trophoblast cells reduces JNK signaling activation under insulin-resistant conditions, ameliorating insulin resistance; JNK antagonists attenuate and JNK agonists aggravate the effect of ANGPTL8 knockdown, placing ANGPTL8 upstream of JNK in insulin resistance signaling.","method":"siRNA knockdown in HTR-8/SVneo trophoblast cells, JNK pathway pharmacological modulation, glucose uptake assay","journal":"Frontiers in endocrinology","confidence":"Low","confidence_rationale":"Tier 3 — single lab, pharmacological pathway placement without direct binding evidence","pmids":["34163433"],"is_preprint":false},{"year":2022,"finding":"ANGPTL8 promotes differentiation of mesenchymal stem cells into adipocytes by inhibiting the Wnt/β-catenin pathway and upregulating PPARγ and C/EBPα; this was confirmed using Wnt/β-catenin activators (LiCl and CHIR99021) that reverse ANGPTL8-mediated differentiation promotion.","method":"ANGPTL8 KO mice, MSC isolation and differentiation assays, Wnt/β-catenin pathway activators, PPARγ and C/EBPα mRNA expression","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — pathway epistasis via pharmacological Wnt activators in KO background, multiple in vivo models","pmids":["36034432"],"is_preprint":false},{"year":2024,"finding":"ZNF638 transcriptionally represses Angptl8 in adipose tissue by recruiting HDAC1 for histone deacetylation; adipose-specific ZNF638 knockout elevates Angptl8 and raises serum TG after refeeding in female mice, and neutralizing circulating ANGPTL8 abolishes this TG elevation, placing ANGPTL8 downstream of ZNF638 in a sexually dimorphic, estrogen-dependent pathway.","method":"Adipose-specific ZNF638 KO mice, adenoviral overexpression, ANGPTL8 neutralizing antibody, RNA-seq, ChIP-based histone deacetylation assay","journal":"Metabolism: clinical and experimental","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis confirmed by ANGPTL8 neutralization rescue, ChIP evidence for ZNF638-HDAC1 mechanism","pmids":["38211696"],"is_preprint":false},{"year":2023,"finding":"ANGPTL8 promotes HCC cell proliferation by activating LILRB2/PIRB to regulate the ROS/ERK pathway and upregulate autophagy in hepatocytes; simultaneously, the ANGPTL8-LILRB2/PIRB interaction polarizes macrophages to an immunosuppressive M2 phenotype and recruits immunosuppressive T cells.","method":"ANGPTL8 KO in DEN-induced mouse HCC, in vitro proliferation assays, flow cytometry, RNA-seq, immunohistochemistry, western blot for ERK/autophagy markers","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vitro and in vivo experiments with defined receptor and downstream pathway, but limited by single lab","pmids":["37188659"],"is_preprint":false},{"year":2022,"finding":"Sebacic acid (a royal jelly fatty acid) downregulates ANGPTL8 expression in HepG2 cells by reducing HNF4α protein levels and its binding to the ANGPTL8 promoter; siRNA knockdown of HNF4α suppresses ANGPTL8 mRNA, identifying HNF4α as a transcriptional activator of ANGPTL8.","method":"Reporter assay for ANGPTL8 promoter, HNF4α binding site identification, siRNA knockdown of HNF4α, ChIP-like promoter binding assay in HepG2 cells","journal":"Bioscience, biotechnology, and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — promoter reporter plus siRNA epistasis and binding assay, complementing HNF-1 data from other labs","pmids":["35325025"],"is_preprint":false},{"year":2016,"finding":"ANGPTL8 is localized to the cytoplasm of adipocytes co-localizing with perilipin-1, and its mRNA is also present in endothelial cells of visceral adipose tissue; this subcellular localization is consistent with both intracellular metabolic function and a paracrine/endocrine secretory role.","method":"Immunocytochemistry, Western blotting, in situ hybridization, RT-PCR in human visceral adipose tissue biopsies from obese and non-obese subjects","journal":"Journal of clinical medicine","confidence":"Low","confidence_rationale":"Tier 3 — localization established by ICC/ISH but not directly linked to functional consequence","pmids":["32069954"],"is_preprint":false},{"year":2018,"finding":"GLP-1 receptor agonists (exendin-4, liraglutide) upregulate ANGPTL8 expression and secretion in HepG2 cells via the PI3K/Akt pathway in a GLP-1 receptor-dependent manner; effects are blocked by the GLP-1R antagonist exendin (9-39) and the PI3K inhibitor LY294002.","method":"HepG2 cell pharmacological treatment with GLP-1R agonists/antagonists and PI3K inhibitor, ANGPTL8 expression and secretion measurement","journal":"Peptides","confidence":"Medium","confidence_rationale":"Tier 2 — receptor and pathway identified via pharmacological blockade, two agonists tested, complemented by clinical data","pmids":["30003931"],"is_preprint":false}],"current_model":"ANGPTL8 is a liver- and adipose-derived secreted protein that, in complex with ANGPTL3, potently inhibits lipoprotein lipase (LPL) and endothelial lipase to direct circulating triglycerides to adipose storage during feeding, while adipose-tissue ANGPTL8 suppresses ANGPTL4 to locally enhance LPL activity; intracellularly, ANGPTL8 also functions as a negative feedback regulator of NF-κB by promoting autophagic degradation of IKKγ via p62, activates insulin signaling through PI3K/AKT, resets the hepatic circadian clock via PirB/LILRB receptor signaling, and suppresses pathological cardiac hypertrophy by binding LILRB3 to inhibit Akt/GSK3β, with its hepatic transcription controlled by HNF-1α and HNF-4α downstream of insulin and refeeding signals."},"narrative":{"teleology":[{"year":2012,"claim":"Identifying ANGPTL8 as a novel insulin- and refeeding-induced gene with a prolipogenic function established the first functional framework for an uncharacterized protein in adipogenesis and lipid storage.","evidence":"siRNA knockdown in 3T3-L1 adipocytes showing ~35% TG reduction, >100-fold induction during adipogenesis and refeeding in mouse fat and liver","pmids":["22569073"],"confidence":"High","gaps":["No molecular target identified","Secreted versus intracellular function not distinguished","Mechanism of TG accumulation not resolved"]},{"year":2013,"claim":"The knockout mouse demonstrated that ANGPTL8 is required for fasting-to-feeding metabolic transitions, establishing its tissue-selective role in directing dietary triglycerides to adipose tissue via regulation of LPL activity.","evidence":"Angptl8 KO mice with reduced VLDL secretion, increased LPL activity in heart but impaired adipose TG uptake in the fed state","pmids":["24043787"],"confidence":"High","gaps":["Mechanism of LPL inhibition (direct or indirect) not determined","Relationship to ANGPTL3 not yet established"]},{"year":2014,"claim":"Ruling out ANGPTL8 as a beta cell proliferogen resolved a major controversy and refocused the field on its lipid-metabolic function.","evidence":"Angptl8-null mice showed normal beta cell expansion under HFD and S961-induced insulin resistance; liver ANGPTL8 overexpression doubled TG without affecting beta cells","pmids":["25417115"],"confidence":"High","gaps":["Molecular mechanism of TG elevation by hepatic overexpression not clarified"]},{"year":2015,"claim":"Identifying tissue-specific LPL suppression in heart and skeletal muscle by ANGPTL8, and demonstrating therapeutic antibody-mediated TG lowering, defined the physiological sites of ANGPTL8-mediated LPL inhibition.","evidence":"Monoclonal antibody targeting EIQVEE epitope lowered TG; Lipasin-deficient mice showed elevated postprandial LPL in cardiac/skeletal muscle but not WAT","pmids":["26687026"],"confidence":"High","gaps":["Whether ANGPTL8 acts on LPL directly or obligately requires ANGPTL3 not yet resolved"]},{"year":2015,"claim":"Upstream transcriptional control of ANGPTL8 by LXR/SREBP-1 and suppression by AMPK placed ANGPTL8 within the canonical hepatic lipogenic transcriptional network.","evidence":"LXR agonist and palmitic acid upregulate ANGPTL8 in HepG2; AICAR suppresses via PPARα phosphorylation; SREBP-1 siRNA blocks induction","pmids":["26254015"],"confidence":"Medium","gaps":["Direct promoter binding by SREBP-1 not demonstrated","In vivo validation of SREBP-1-dependent regulation lacking"]},{"year":2016,"claim":"Demonstration that ANGPTL8 overexpression enhances and knockout attenuates insulin-stimulated Akt/GSK3β/FoxO1 phosphorylation established an intracellular signaling function beyond LPL regulation.","evidence":"TALEN-mediated KO and stable overexpression in HepG2; western blot of PI3K/Akt pathway under normal and insulin-resistant conditions","pmids":["26387753"],"confidence":"Medium","gaps":["Mechanism by which intracellular ANGPTL8 activates Akt not determined","Not replicated in primary hepatocytes at this stage"]},{"year":2017,"claim":"Reconstitution of the ANGPTL3–ANGPTL8 complex and demonstration of its obligate partnership for LPL inhibition resolved how ANGPTL8 functions as a secreted lipase inhibitor — it dramatically enhances ANGPTL3's LPL-binding capacity rather than acting independently.","evidence":"Co-IP and NanoBiT split-luciferase confirmed physical interaction; ANGPTL3 raised TG only in presence of ANGPTL8 in vivo; antibody to ANGPTL8 C-terminus blocked LPL inhibition; mutated ANGPTL3 still activated ANGPTL8","pmids":["28413163","29031715"],"confidence":"High","gaps":["Structural basis of complex formation unknown","Stoichiometry of the complex not determined"]},{"year":2017,"claim":"Discovery that intracellular ANGPTL8 promotes selective autophagic degradation of IKKγ via p62/SQSTM1 revealed an unexpected anti-inflammatory, NF-κB-regulatory function mechanistically distinct from its extracellular lipase-inhibitory role.","evidence":"Reciprocal Co-IP of ANGPTL8–IKKγ–p62, autophagic flux assays, N-terminal domain mutagenesis abolishing oligomerization and function, in vivo LPS model","pmids":["29255244"],"confidence":"High","gaps":["Whether this function operates in physiological contexts beyond experimental inflammation unknown","Relationship between secreted and intracellular pools not clarified"]},{"year":2018,"claim":"Interaction of ANGPTL8 C-terminus with nuclear SREBP1 to block AMPK-mediated inhibition linked ANGPTL8 to lipogenesis-dependent tumor cell proliferation in HCC.","evidence":"Co-IP with domain truncation mapping (aa 121–198), AMPK inhibition assays, in vivo tumor growth assays","pmids":["29663480"],"confidence":"High","gaps":["Whether this interaction is relevant outside HCC not established","Crystal structure of ANGPTL8–nSREBP1 complex lacking"]},{"year":2019,"claim":"ANGPTL8 was found to signal through the PirB/LILRB membrane receptor to reset the hepatic circadian clock via Per1 activation, establishing it as an endocrine entrainment signal linking feeding to peripheral clock resetting.","evidence":"Angptl8 KO and overexpression mice, PirB receptor blocking, circadian gene expression profiling","pmids":["31388006"],"confidence":"High","gaps":["Downstream signaling cascade from PirB to Per1 incompletely characterized","Whether ANGPTL8-PirB signaling operates in non-hepatic tissues not determined at this stage"]},{"year":2020,"claim":"Tissue-specific knockouts resolved the dual-mode model: hepatic ANGPTL8 acts endocrinally with ANGPTL3 to inhibit LPL in oxidative tissues, while adipose ANGPTL8 acts locally to suppress ANGPTL4 and enhance adipose LPL activity.","evidence":"Liver-specific and adipose-specific Angptl8 KO mice with plasma TG, tissue LPL activity, and cell-based ANGPTL4 secretion assays","pmids":["32730227"],"confidence":"High","gaps":["Molecular mechanism of ANGPTL4 suppression by ANGPTL8 not fully defined","Whether ANGPTL8 forms a physical complex with ANGPTL4 unclear"]},{"year":2020,"claim":"Identification of HNF-1α binding to a defined promoter element (−84/−68 bp) and its requirement for insulin-induced ANGPTL8 transcription established the core transcriptional mechanism for hepatic ANGPTL8 regulation, complemented by HNF-4α and C/EBPβ as additional transcriptional activators.","evidence":"EMSA and ChIP confirming HNF-1α binding, promoter deletion/mutation, HNF-1 siRNA abolishing insulin induction; HNF-4α identified by siRNA and promoter assay; C/EBPβ identified by insulin clamp and reporter assays","pmids":["32561878","35325025","32154742"],"confidence":"High","gaps":["Chromatin-level regulation (enhancers, epigenetic marks) not mapped genome-wide","Integration of HNF-1α, HNF-4α, C/EBPβ, and SREBP-1 inputs at the endogenous locus not resolved"]},{"year":2022,"claim":"Extension of LILRB receptor signaling to cardiac and hepatic stellate cell contexts — ANGPTL8 binding LILRB3 suppresses cardiac hypertrophy via Akt/GSK3β inhibition, while ANGPTL8 binding LILRB2 activates stellate cells via ERK to promote fibrosis — broadened the receptor-mediated signaling paradigm beyond circadian entrainment.","evidence":"ANGPTL8 KO in Ang II/TAC cardiac models with IP-MS receptor identification and siRNA/blocking antibody confirmation; KO in HFD/CCl4 liver models with AAV8 rescue and Co-IP for LILRB2","pmids":["35851270","36031141"],"confidence":"High","gaps":["Selectivity determinants for LILRB2 vs LILRB3 binding unknown","Whether different LILRB family members produce opposing downstream effects in the same tissue not tested"]},{"year":2022,"claim":"Human genetic mimicry analysis established that the ANGPTL3–ANGPTL8 complex inhibits endothelial lipase in addition to LPL, with the R59W variant differentially affecting EL versus LPL inhibition, extending the target range of the complex beyond LPL.","evidence":"Variant-specific metabolite profiling in >110,000 UK Biobank individuals and 11 European cohorts","pmids":["36372100"],"confidence":"Medium","gaps":["No direct enzymatic assay confirming EL inhibition by the purified complex","Structural basis for differential R59W effects on EL vs LPL not determined"]},{"year":2024,"claim":"Neuron-specific ANGPTL8 knockout demonstrated a brain-intrinsic role for ANGPTL8 in diabetic neuroinflammation and synaptic loss via PirB signaling, extending ANGPTL8's paracrine LILRB-mediated functions to the central nervous system.","evidence":"Neuron-specific Angptl8 KO and PirB-/- mice, behavioral testing, synaptic marker and cytokine measurement","pmids":["39095838"],"confidence":"Medium","gaps":["Whether neuronal ANGPTL8 has physiological roles outside diabetic pathology unknown","Downstream signaling cascade from PirB in neurons not fully mapped"]},{"year":null,"claim":"Key unresolved questions include the structural basis of the ANGPTL3–ANGPTL8 complex and how it differentially inhibits LPL versus endothelial lipase; the molecular mechanism by which adipose ANGPTL8 suppresses ANGPTL4; the selectivity determinants for LILRB2 versus LILRB3 receptor engagement; and how intracellular (NF-κB/autophagy, SREBP1) and extracellular (LPL inhibition, LILRB signaling) functions are coordinated from a single gene product.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of ANGPTL3–ANGPTL8 complex","Mechanism of ANGPTL4 suppression by ANGPTL8 at the molecular level undefined","Partitioning of ANGPTL8 between secreted and intracellular pools not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,3,5,8,21]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[6,10,11,22]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,2,3,5,8,10,11]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,9,30]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,2,3,5,8,12,13,21]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,6,10,11,14,15,22,28]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,24,28]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[6]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[4,28]}],"complexes":["ANGPTL3-ANGPTL8 complex"],"partners":["ANGPTL3","ANGPTL4","LILRB2","LILRB3","IKBKG","SQSTM1","SREBF1","LPL"],"other_free_text":[]},"mechanistic_narrative":"ANGPTL8 is a secreted, insulin-induced regulator of triglyceride partitioning that coordinates lipid trafficking between tissues during the fasting-to-feeding transition. In the fed state, liver-derived ANGPTL8 forms a complex with ANGPTL3 that potently inhibits lipoprotein lipase (LPL) and endothelial lipase in oxidative tissues (heart, skeletal muscle), while adipose-derived ANGPTL8 suppresses ANGPTL4 to locally enhance LPL activity, thereby directing circulating triglycerides to adipose storage [PMID:24043787, PMID:28413163, PMID:32730227, PMID:36372100]. Hepatic ANGPTL8 transcription is controlled by insulin-responsive transcription factors HNF-1α and HNF-4α and is antagonized by AMPK signaling [PMID:32561878, PMID:35325025, PMID:32154742]. Beyond lipid metabolism, intracellular ANGPTL8 negatively regulates NF-κB signaling by promoting p62-mediated autophagic degradation of IKKγ [PMID:29255244], and extracellular ANGPTL8 signals through LILRB family receptors (PirB/LILRB2/LILRB3) to reset the hepatic circadian clock, promote hepatic stellate cell activation, and suppress pathological cardiac hypertrophy [PMID:31388006, PMID:36031141, PMID:35851270]."},"prefetch_data":{"uniprot":{"accession":"Q6UXH0","full_name":"Angiopoietin-like protein 8","aliases":["Betatrophin","Lipasin","Refeeding-induced fat and liver protein"],"length_aa":198,"mass_kda":22.1,"function":"Hormone that acts as a blood lipid regulator by regulating serum triglyceride levels (PubMed:22569073, PubMed:22809513, PubMed:23150577). May be involved in the metabolic transition between fasting and refeeding: required to direct fatty acids to adipose tissue for storage in the fed state (By similarity)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q6UXH0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ANGPTL8","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ANGPTL8","total_profiled":1310},"omim":[{"mim_id":"616223","title":"ANGIOPOIETIN-LIKE 8; ANGPTL8","url":"https://www.omim.org/entry/616223"},{"mim_id":"604774","title":"ANGIOPOIETIN-LIKE 3; ANGPTL3","url":"https://www.omim.org/entry/604774"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"liver","ntpm":408.5}],"url":"https://www.proteinatlas.org/search/ANGPTL8"},"hgnc":{"alias_symbol":["TD26","RIFL"],"prev_symbol":["C19orf80"]},"alphafold":{"accession":"Q6UXH0","domains":[{"cath_id":"1.10.287","chopping":"95-196","consensus_level":"high","plddt":87.7527,"start":95,"end":196}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6UXH0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6UXH0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6UXH0-F1-predicted_aligned_error_v6.png","plddt_mean":84.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ANGPTL8","jax_strain_url":"https://www.jax.org/strain/search?query=ANGPTL8"},"sequence":{"accession":"Q6UXH0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6UXH0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6UXH0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6UXH0"}},"corpus_meta":[{"pmid":"24043787","id":"PMC_24043787","title":"Mice lacking ANGPTL8 (Betatrophin) manifest disrupted triglyceride metabolism without impaired glucose homeostasis.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24043787","citation_count":281,"is_preprint":false},{"pmid":"22569073","id":"PMC_22569073","title":"Identification of RIFL, a novel adipocyte-enriched insulin target gene with a role in lipid metabolism.","date":"2012","source":"American journal of physiology. 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Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD + KO + expression profiling), foundational paper with 266 citations\",\n      \"pmids\": [\"22569073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ANGPTL8 possesses a functional LPL inhibitory motif but requires ANGPTL3 expression to inhibit LPL and elevate plasma TG; ANGPTL3 activity is not required for its ability to activate ANGPTL8, and the ANGPTL3-ANGPTL8 complex is far more efficacious at raising TG than ANGPTL3 alone. An antibody to the C-terminus of ANGPTL8 blocks LPL inhibition without disrupting the complex.\",\n      \"method\": \"Co-expression in mouse models, mutated ANGPTL3 (LPL-inhibitory activity ablated), monoclonal antibody blockade, in vivo TG measurements\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo genetic and antibody approaches, replicated with complementary data from Chi et al. 2017\",\n      \"pmids\": [\"28413163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ANGPTL8 physically binds ANGPTL3 (detected by Co-IP and NanoBiT split-luciferase); the ANGPTL3-ANGPTL8 complex dramatically increases ANGPTL3's ability to bind LPL compared to either protein alone, and co-expression with ANGPTL3 greatly enhances ANGPTL8 secretion. Adenoviral overexpression of ANGPTL3 raises plasma TG only in the presence of ANGPTL8.\",\n      \"method\": \"Co-immunoprecipitation, NanoBiT split-luciferase protein interaction assay, lipase activity assays, adenovirus injection in Angptl8-null mice\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — reconstituted complex in cells, multiple orthogonal binding and activity assays, genetic epistasis in vivo\",\n      \"pmids\": [\"29031715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Intracellular ANGPTL8 functions as a negative feedback regulator of TNFα-triggered NF-κB activation by facilitating the interaction of IKKγ with p62/SQSTM1 to promote selective autophagic degradation of IKKγ; N-terminal domain-mediated self-oligomerization of ANGPTL8 is essential for this activity.\",\n      \"method\": \"Knockdown/knockout of ANGPTL8 in cell lines, Co-IP, autophagic flux assays, domain mutagenesis, LPS-injected mouse model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, domain mutagenesis, in vitro and in vivo validation with orthogonal methods\",\n      \"pmids\": [\"29255244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hepatic ANGPTL8 acts endocrinally (with ANGPTL3) to inhibit intravascular LPL in oxidative tissues, whereas adipose-tissue ANGPTL8 acts autocrine/paracrinely to inhibit ANGPTL4 and thereby enhance local LPL activity; co-expression of ANGPTL8 with ANGPTL4 in cultured cells reduces ANGPTL4 secretion and ANGPTL4-mediated LPL inhibition.\",\n      \"method\": \"Liver-specific and adipose-specific Angptl8 knockout mice, plasma TG and LPL activity assays, cell-based ANGPTL4 secretion assays\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with defined phenotypic readouts and cell-based mechanistic follow-up\",\n      \"pmids\": [\"32730227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ANGPTL8 resets diurnal rhythms of hepatic clock and metabolic genes in mice through signaling via membrane receptor PirB (LILRB), phosphorylation of downstream kinases and transcription factors, and transient activation of the clock gene Per1; inhibition of ANGPTL8 signaling partially blocks food-entrained resetting of the liver clock.\",\n      \"method\": \"Angptl8 knockout and overexpression in mice, PirB blocking, gene expression profiling, circadian rhythm analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO combined with receptor blocking and epistasis analysis in vivo\",\n      \"pmids\": [\"31388006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ANGPTL8 does not control pancreatic beta cell expansion; Angptl8-null mice undergo normal beta cell expansion in response to insulin resistance from high-fat diet or S961 administration, and liver overexpression of ANGPTL8 doubles plasma TG but does not alter beta cell expansion or glucose metabolism.\",\n      \"method\": \"Angptl8 knockout mice, high-fat diet and S961 insulin resistance models, beta cell quantification, hepatic overexpression\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO and OE with rigorous beta cell proliferation readouts, 178 citations, replicated by multiple labs\",\n      \"pmids\": [\"25417115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A monoclonal antibody targeting the EIQVEE epitope of ANGPTL8 (Lipasin) lowers serum TG in mice; Lipasin-deficient mice show elevated postprandial LPL activity specifically in heart and skeletal muscle but not white adipose tissue, indicating lipasin suppresses LPL in cardiac/skeletal muscle to redirect circulating TG to adipose tissue in the fed state.\",\n      \"method\": \"Monoclonal antibody generation and injection, Lipasin-deficient mouse model, tissue LPL activity assays, fed/fasted TG measurements\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model combined with antibody blockade and tissue-specific LPL activity measurements\",\n      \"pmids\": [\"26687026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HCC-associated protein TD26 (ANGPTL8) interacts via its C-terminus (aa 121–198) with the truncated nuclear form of SREBP1 (nSREBP1) but not full-length SREBP1, blocking AMPK-mediated inhibition of SREBP1 activity, thereby increasing lipogenesis and promoting tumor cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, domain truncation mapping, AMPK inhibition assays, metabolomics, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — defined binding domain by truncation + Co-IP, mechanistic rescue with SREBP1 dependence, functional in vivo validation\",\n      \"pmids\": [\"29663480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ANGPTL8 accelerates hepatic stellate cell activation and liver fibrosis by interacting with the LILRB2 receptor to induce ERK signaling and upregulate profibrotic gene expression; liver-derived ANGPTL8 was confirmed as the active source by AAV8-mediated liver-specific restoration in KO mice.\",\n      \"method\": \"ANGPTL8 KO mice (HFD, HFHC, CCL4 models), AAV8 liver restoration, Co-IP, protein array, RNA-seq, histology\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with tissue-specific rescue, receptor identification by Co-IP and signaling pathway validation\",\n      \"pmids\": [\"36031141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ANGPTL8 serves as a negative regulator of pathological cardiac hypertrophy by directly binding to LILRB3 (PirB) and inhibiting Akt/GSK3β activation; ANGPTL8 deficiency accelerates Ang II- or TAC-induced cardiac hypertrophy, while recombinant ANGPTL8 protein attenuates cardiomyocyte enlargement in vitro.\",\n      \"method\": \"ANGPTL8 KO mice (Ang II and TAC models), recombinant protein treatment in primary cardiomyocytes, RNA-seq, immunoprecipitation-mass spectrometry, siRNA-LILRB3 and anti-LILRB3 blocking\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined phenotype, receptor identified by IP-MS, confirmed by siRNA and blocking antibody, Akt activator rescue\",\n      \"pmids\": [\"35851270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ANGPTL8 antisense oligonucleotide treatment in high-fat-fed rats increases postprandial TG uptake in white adipose tissue, prevents hepatic steatosis, inhibits PKCε activation, and rescues hepatic insulin resistance, positioning adipose-tissue LPL disinhibition as the mechanistic basis.\",\n      \"method\": \"ASO knockdown in rats and mice, hyperinsulinemic-euglycaemic clamps, tissue lipid content, PKCε activation, Akt phosphorylation assays, meal tolerance tests\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological KD with mechanistic pathway readouts (PKCε, Akt), in vivo clamp studies\",\n      \"pmids\": [\"29497783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ANGPTL8 knockdown in 3T3-L1 adipocytes enhances intracellular lipolysis (increased NEFA release) and upregulates Angptl4, Leptin, Cpt1a, Cpt1b, and Pgc-1α; it also alters cellular phospholipid composition (reduces alkyl-PCs and PE plasmalogens), indicating that ANGPTL8 acts to suppress intracellular lipolysis and regulate the cellular lipidome.\",\n      \"method\": \"Lentiviral shRNA knockdown in 3T3-L1 adipocytes, lipolysis assays, lipidomics, gene expression analysis\",\n      \"journal\": \"Chemistry and physics of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with multiple orthogonal readouts in a single lab\",\n      \"pmids\": [\"28528274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANGPTL8 overexpression in HepG2 cells enhances insulin-stimulated Akt-GSK3β and Akt-FoxO1 phosphorylation regardless of insulin resistance status; knockout of ANGPTL8 attenuates these pathways specifically under insulin resistance conditions, suggesting ANGPTL8 activates insulin signaling via the PI3K/Akt axis.\",\n      \"method\": \"TALEN-mediated KO and stable overexpression in HepG2 cells, western blot of Akt/GSK3β/FoxO1 phosphorylation under normal and insulin-resistant conditions\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular mechanism with KO and OE comparison, but single lab\",\n      \"pmids\": [\"26387753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ANGPTL8 enhances insulin sensitivity by directly activating AKT phosphorylation in the insulin-mediated PI3K/AKT signaling pathway; Ser94 and Thr98 on ANGPTL8 are the key residues required for AKT activation, identified by point mutation and fragment truncation analysis.\",\n      \"method\": \"Hydrodynamic tail vein transfection in mice, siRNA knockdown and in vitro mRNA overexpression in primary hepatocytes, site-directed mutagenesis, western blot of AKT phosphorylation\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — mutagenesis identifying key residues combined with in vivo and in vitro validation, but single lab\",\n      \"pmids\": [\"32344005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANGPTL8 (RIFL) expression is suppressed by lipolytic stimuli (β-adrenergic agonist isoproterenol, adenylate cyclase activator forskolin) and modestly reduces TG content when knocked down; a >8-fold increase in ANGPTL8 expression is seen in WAT of ob/ob mice and ~80-fold after refeeding, consistent with its role as an insulin/refeeding-induced LPL regulator.\",\n      \"method\": \"Angptl8 KO mice, 3T3-L1 adipocyte knockdown, pharmacological stimulation, gene expression, TG content measurement\",\n      \"journal\": \"Scientific reports (Dang et al.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, partially mechanistic, but consistent with multiple other reports\",\n      \"pmids\": [\"27845381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ANGPTL8 expression in hepatocytes is regulated by the LXR/SREBP-1 signaling pathway; LXR agonist T0901317, palmitic acid, and tunicamycin all upregulate ANGPTL8 expression, while AICAR (AMPK activator) suppresses LXR/SREBP-1-induced ANGPTL8 expression through PPARα phosphorylation.\",\n      \"method\": \"HepG2 cell pharmacological treatments, siRNA for SREBP-1, gene expression analysis, AICAR and PPARα inhibitor experiments\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological and siRNA approaches establishing pathway, but single lab\",\n      \"pmids\": [\"26254015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Insulin acutely induces Angptl8 expression in liver and adipose tissue via the CCAAT/enhancer-binding protein (C/EBPβ) transcription factor; glucose further enhances adipose Angptl8 expression in the presence of insulin; AMPK activation antagonizes insulin-stimulated Angptl8 expression in hepatocytes and adipocytes.\",\n      \"method\": \"In vivo insulin clamp experiments in mice, primary hepatocyte and adipocyte cultures, C/EBPβ identification, luciferase reporter assays, AMPK pathway inhibition\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo clamping plus in vitro reporter assays identifying C/EBPβ as transcriptional mediator\",\n      \"pmids\": [\"32154742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Transcriptional regulation of Angptl8 in the liver is mediated by HNF-1α/β binding to a defined site (-84/-68 bp) in the Angptl8 promoter; HNF-1α binding is confirmed by EMSA and ChIP, and HNF-1α levels increase rapidly after refeeding in parallel with Angptl8 expression; insulin-induced Angptl8 upregulation is completely abolished by HNF-1 knockdown.\",\n      \"method\": \"Promoter deletion/mutation analysis, luciferase reporter assay, EMSA, ChIP, HNF-1 siRNA in hepatoma cells and primary hepatocytes\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding confirmed by EMSA and ChIP, promoter mutagenesis, in vitro and in vivo validation\",\n      \"pmids\": [\"32561878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MicroRNA-221-3p targets the ANGPTL8 mRNA 3'UTR to reduce ANGPTL8 protein expression in adipocytes; inflammatory macrophage-conditioned medium induces miR-221-3p which suppresses ANGPTL8 expression, linking adipose inflammation to reduced ANGPTL8 levels.\",\n      \"method\": \"miR-221-3p mimic/inhibitor transfection in human adipocytes, 3'UTR luciferase reporter assay, subcutaneous adipose tissue biopsies from lean to obese subjects\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'UTR targeting validated by reporter assay plus gain/loss-of-function in adipocytes, replicated in tissue biopsies\",\n      \"pmids\": [\"28938482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The ANGPTL3-ANGPTL8 complex targets both LPL and endothelial lipase (EL/LIPG) in humans; genetic mimicry analysis shows the R59W substitution in ANGPTL8 more strongly affects EL inhibition than LPL inhibition, while a rare protein-truncating ANGPTL8 variant shows the complex to be LPL-specific.\",\n      \"method\": \"Human genetic mimicry analysis using UK Biobank (>110,000 individuals) and 11 European population cohorts, variant-specific metabolite profiling\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale human genetic epistasis identifying specific lipase targets, but no direct enzymatic assay\",\n      \"pmids\": [\"36372100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ANGPTL8 in the diabetic brain is secreted by neurons into the hippocampus and acts via its receptor PirB (LILRB) on both neurons and microglia; in neurons it downregulates synaptic and axonal markers, in microglia it upregulates proinflammatory cytokines, collectively causing neuroinflammation and synaptic loss; neuron-specific Angptl8 KO prevents these effects.\",\n      \"method\": \"Neuron-specific Angptl8 KO mice, PirB-/- mice, recombinant ANGPTL8 protein treatment, Barnes Maze and novel object recognition, synaptic marker assays, cytokine measurement\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO and receptor KO with behavioral and molecular readouts, mechanistic pathway validated\",\n      \"pmids\": [\"39095838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ANGPTL8 knockdown in primary mouse subcutaneous preadipocytes impedes adipocyte differentiation, reduces TG accumulation, attenuates isoproterenol-stimulated lipolysis, and reduces early expression of adipogenic genes (PPARγ) and insulin signaling genes, as well as decreasing insulin-stimulated Akt phosphorylation at early differentiation.\",\n      \"method\": \"siRNA knockdown, RNA-seq at multiple differentiation time points, Akt phosphorylation western blot, lipolysis assays in primary preadipocytes\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA-seq plus targeted signaling assays in primary cells, but single lab\",\n      \"pmids\": [\"38272177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ANGPTL8 deficiency attenuates LPS-induced liver injury by activating the PGC1α/PPARα pathway to improve fatty acid oxidation; LPS promotes ANGPTL8 expression via TNF-α, and Angptl8 KO reduces hepatic lipid accumulation and lipid peroxidation, improving survival in septic mice.\",\n      \"method\": \"Angptl8 KO mice, LPS-induced liver injury model, TNF-α pathway inhibition, PGC1α/PPARα pathway analysis, survival studies\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined pathway (PGC1α/PPARα), TNF-α epistasis, and survival outcome\",\n      \"pmids\": [\"39019343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANGPTL8 siRNA knockdown in trophoblast cells reduces JNK signaling activation under insulin-resistant conditions, ameliorating insulin resistance; JNK antagonists attenuate and JNK agonists aggravate the effect of ANGPTL8 knockdown, placing ANGPTL8 upstream of JNK in insulin resistance signaling.\",\n      \"method\": \"siRNA knockdown in HTR-8/SVneo trophoblast cells, JNK pathway pharmacological modulation, glucose uptake assay\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pharmacological pathway placement without direct binding evidence\",\n      \"pmids\": [\"34163433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ANGPTL8 promotes differentiation of mesenchymal stem cells into adipocytes by inhibiting the Wnt/β-catenin pathway and upregulating PPARγ and C/EBPα; this was confirmed using Wnt/β-catenin activators (LiCl and CHIR99021) that reverse ANGPTL8-mediated differentiation promotion.\",\n      \"method\": \"ANGPTL8 KO mice, MSC isolation and differentiation assays, Wnt/β-catenin pathway activators, PPARγ and C/EBPα mRNA expression\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway epistasis via pharmacological Wnt activators in KO background, multiple in vivo models\",\n      \"pmids\": [\"36034432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZNF638 transcriptionally represses Angptl8 in adipose tissue by recruiting HDAC1 for histone deacetylation; adipose-specific ZNF638 knockout elevates Angptl8 and raises serum TG after refeeding in female mice, and neutralizing circulating ANGPTL8 abolishes this TG elevation, placing ANGPTL8 downstream of ZNF638 in a sexually dimorphic, estrogen-dependent pathway.\",\n      \"method\": \"Adipose-specific ZNF638 KO mice, adenoviral overexpression, ANGPTL8 neutralizing antibody, RNA-seq, ChIP-based histone deacetylation assay\",\n      \"journal\": \"Metabolism: clinical and experimental\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis confirmed by ANGPTL8 neutralization rescue, ChIP evidence for ZNF638-HDAC1 mechanism\",\n      \"pmids\": [\"38211696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ANGPTL8 promotes HCC cell proliferation by activating LILRB2/PIRB to regulate the ROS/ERK pathway and upregulate autophagy in hepatocytes; simultaneously, the ANGPTL8-LILRB2/PIRB interaction polarizes macrophages to an immunosuppressive M2 phenotype and recruits immunosuppressive T cells.\",\n      \"method\": \"ANGPTL8 KO in DEN-induced mouse HCC, in vitro proliferation assays, flow cytometry, RNA-seq, immunohistochemistry, western blot for ERK/autophagy markers\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo experiments with defined receptor and downstream pathway, but limited by single lab\",\n      \"pmids\": [\"37188659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Sebacic acid (a royal jelly fatty acid) downregulates ANGPTL8 expression in HepG2 cells by reducing HNF4α protein levels and its binding to the ANGPTL8 promoter; siRNA knockdown of HNF4α suppresses ANGPTL8 mRNA, identifying HNF4α as a transcriptional activator of ANGPTL8.\",\n      \"method\": \"Reporter assay for ANGPTL8 promoter, HNF4α binding site identification, siRNA knockdown of HNF4α, ChIP-like promoter binding assay in HepG2 cells\",\n      \"journal\": \"Bioscience, biotechnology, and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter plus siRNA epistasis and binding assay, complementing HNF-1 data from other labs\",\n      \"pmids\": [\"35325025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANGPTL8 is localized to the cytoplasm of adipocytes co-localizing with perilipin-1, and its mRNA is also present in endothelial cells of visceral adipose tissue; this subcellular localization is consistent with both intracellular metabolic function and a paracrine/endocrine secretory role.\",\n      \"method\": \"Immunocytochemistry, Western blotting, in situ hybridization, RT-PCR in human visceral adipose tissue biopsies from obese and non-obese subjects\",\n      \"journal\": \"Journal of clinical medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — localization established by ICC/ISH but not directly linked to functional consequence\",\n      \"pmids\": [\"32069954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GLP-1 receptor agonists (exendin-4, liraglutide) upregulate ANGPTL8 expression and secretion in HepG2 cells via the PI3K/Akt pathway in a GLP-1 receptor-dependent manner; effects are blocked by the GLP-1R antagonist exendin (9-39) and the PI3K inhibitor LY294002.\",\n      \"method\": \"HepG2 cell pharmacological treatment with GLP-1R agonists/antagonists and PI3K inhibitor, ANGPTL8 expression and secretion measurement\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor and pathway identified via pharmacological blockade, two agonists tested, complemented by clinical data\",\n      \"pmids\": [\"30003931\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ANGPTL8 is a liver- and adipose-derived secreted protein that, in complex with ANGPTL3, potently inhibits lipoprotein lipase (LPL) and endothelial lipase to direct circulating triglycerides to adipose storage during feeding, while adipose-tissue ANGPTL8 suppresses ANGPTL4 to locally enhance LPL activity; intracellularly, ANGPTL8 also functions as a negative feedback regulator of NF-κB by promoting autophagic degradation of IKKγ via p62, activates insulin signaling through PI3K/AKT, resets the hepatic circadian clock via PirB/LILRB receptor signaling, and suppresses pathological cardiac hypertrophy by binding LILRB3 to inhibit Akt/GSK3β, with its hepatic transcription controlled by HNF-1α and HNF-4α downstream of insulin and refeeding signals.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ANGPTL8 is a secreted, insulin-induced regulator of triglyceride partitioning that coordinates lipid trafficking between tissues during the fasting-to-feeding transition. In the fed state, liver-derived ANGPTL8 forms a complex with ANGPTL3 that potently inhibits lipoprotein lipase (LPL) and endothelial lipase in oxidative tissues (heart, skeletal muscle), while adipose-derived ANGPTL8 suppresses ANGPTL4 to locally enhance LPL activity, thereby directing circulating triglycerides to adipose storage [PMID:24043787, PMID:28413163, PMID:32730227, PMID:36372100]. Hepatic ANGPTL8 transcription is controlled by insulin-responsive transcription factors HNF-1α and HNF-4α and is antagonized by AMPK signaling [PMID:32561878, PMID:35325025, PMID:32154742]. Beyond lipid metabolism, intracellular ANGPTL8 negatively regulates NF-κB signaling by promoting p62-mediated autophagic degradation of IKKγ [PMID:29255244], and extracellular ANGPTL8 signals through LILRB family receptors (PirB/LILRB2/LILRB3) to reset the hepatic circadian clock, promote hepatic stellate cell activation, and suppress pathological cardiac hypertrophy [PMID:31388006, PMID:36031141, PMID:35851270].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying ANGPTL8 as a novel insulin- and refeeding-induced gene with a prolipogenic function established the first functional framework for an uncharacterized protein in adipogenesis and lipid storage.\",\n      \"evidence\": \"siRNA knockdown in 3T3-L1 adipocytes showing ~35% TG reduction, >100-fold induction during adipogenesis and refeeding in mouse fat and liver\",\n      \"pmids\": [\"22569073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular target identified\", \"Secreted versus intracellular function not distinguished\", \"Mechanism of TG accumulation not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The knockout mouse demonstrated that ANGPTL8 is required for fasting-to-feeding metabolic transitions, establishing its tissue-selective role in directing dietary triglycerides to adipose tissue via regulation of LPL activity.\",\n      \"evidence\": \"Angptl8 KO mice with reduced VLDL secretion, increased LPL activity in heart but impaired adipose TG uptake in the fed state\",\n      \"pmids\": [\"24043787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of LPL inhibition (direct or indirect) not determined\", \"Relationship to ANGPTL3 not yet established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Ruling out ANGPTL8 as a beta cell proliferogen resolved a major controversy and refocused the field on its lipid-metabolic function.\",\n      \"evidence\": \"Angptl8-null mice showed normal beta cell expansion under HFD and S961-induced insulin resistance; liver ANGPTL8 overexpression doubled TG without affecting beta cells\",\n      \"pmids\": [\"25417115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of TG elevation by hepatic overexpression not clarified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying tissue-specific LPL suppression in heart and skeletal muscle by ANGPTL8, and demonstrating therapeutic antibody-mediated TG lowering, defined the physiological sites of ANGPTL8-mediated LPL inhibition.\",\n      \"evidence\": \"Monoclonal antibody targeting EIQVEE epitope lowered TG; Lipasin-deficient mice showed elevated postprandial LPL in cardiac/skeletal muscle but not WAT\",\n      \"pmids\": [\"26687026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ANGPTL8 acts on LPL directly or obligately requires ANGPTL3 not yet resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Upstream transcriptional control of ANGPTL8 by LXR/SREBP-1 and suppression by AMPK placed ANGPTL8 within the canonical hepatic lipogenic transcriptional network.\",\n      \"evidence\": \"LXR agonist and palmitic acid upregulate ANGPTL8 in HepG2; AICAR suppresses via PPARα phosphorylation; SREBP-1 siRNA blocks induction\",\n      \"pmids\": [\"26254015\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding by SREBP-1 not demonstrated\", \"In vivo validation of SREBP-1-dependent regulation lacking\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstration that ANGPTL8 overexpression enhances and knockout attenuates insulin-stimulated Akt/GSK3β/FoxO1 phosphorylation established an intracellular signaling function beyond LPL regulation.\",\n      \"evidence\": \"TALEN-mediated KO and stable overexpression in HepG2; western blot of PI3K/Akt pathway under normal and insulin-resistant conditions\",\n      \"pmids\": [\"26387753\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which intracellular ANGPTL8 activates Akt not determined\", \"Not replicated in primary hepatocytes at this stage\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Reconstitution of the ANGPTL3–ANGPTL8 complex and demonstration of its obligate partnership for LPL inhibition resolved how ANGPTL8 functions as a secreted lipase inhibitor — it dramatically enhances ANGPTL3's LPL-binding capacity rather than acting independently.\",\n      \"evidence\": \"Co-IP and NanoBiT split-luciferase confirmed physical interaction; ANGPTL3 raised TG only in presence of ANGPTL8 in vivo; antibody to ANGPTL8 C-terminus blocked LPL inhibition; mutated ANGPTL3 still activated ANGPTL8\",\n      \"pmids\": [\"28413163\", \"29031715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of complex formation unknown\", \"Stoichiometry of the complex not determined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery that intracellular ANGPTL8 promotes selective autophagic degradation of IKKγ via p62/SQSTM1 revealed an unexpected anti-inflammatory, NF-κB-regulatory function mechanistically distinct from its extracellular lipase-inhibitory role.\",\n      \"evidence\": \"Reciprocal Co-IP of ANGPTL8–IKKγ–p62, autophagic flux assays, N-terminal domain mutagenesis abolishing oligomerization and function, in vivo LPS model\",\n      \"pmids\": [\"29255244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this function operates in physiological contexts beyond experimental inflammation unknown\", \"Relationship between secreted and intracellular pools not clarified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Interaction of ANGPTL8 C-terminus with nuclear SREBP1 to block AMPK-mediated inhibition linked ANGPTL8 to lipogenesis-dependent tumor cell proliferation in HCC.\",\n      \"evidence\": \"Co-IP with domain truncation mapping (aa 121–198), AMPK inhibition assays, in vivo tumor growth assays\",\n      \"pmids\": [\"29663480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this interaction is relevant outside HCC not established\", \"Crystal structure of ANGPTL8–nSREBP1 complex lacking\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"ANGPTL8 was found to signal through the PirB/LILRB membrane receptor to reset the hepatic circadian clock via Per1 activation, establishing it as an endocrine entrainment signal linking feeding to peripheral clock resetting.\",\n      \"evidence\": \"Angptl8 KO and overexpression mice, PirB receptor blocking, circadian gene expression profiling\",\n      \"pmids\": [\"31388006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling cascade from PirB to Per1 incompletely characterized\", \"Whether ANGPTL8-PirB signaling operates in non-hepatic tissues not determined at this stage\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Tissue-specific knockouts resolved the dual-mode model: hepatic ANGPTL8 acts endocrinally with ANGPTL3 to inhibit LPL in oxidative tissues, while adipose ANGPTL8 acts locally to suppress ANGPTL4 and enhance adipose LPL activity.\",\n      \"evidence\": \"Liver-specific and adipose-specific Angptl8 KO mice with plasma TG, tissue LPL activity, and cell-based ANGPTL4 secretion assays\",\n      \"pmids\": [\"32730227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of ANGPTL4 suppression by ANGPTL8 not fully defined\", \"Whether ANGPTL8 forms a physical complex with ANGPTL4 unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of HNF-1α binding to a defined promoter element (−84/−68 bp) and its requirement for insulin-induced ANGPTL8 transcription established the core transcriptional mechanism for hepatic ANGPTL8 regulation, complemented by HNF-4α and C/EBPβ as additional transcriptional activators.\",\n      \"evidence\": \"EMSA and ChIP confirming HNF-1α binding, promoter deletion/mutation, HNF-1 siRNA abolishing insulin induction; HNF-4α identified by siRNA and promoter assay; C/EBPβ identified by insulin clamp and reporter assays\",\n      \"pmids\": [\"32561878\", \"35325025\", \"32154742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin-level regulation (enhancers, epigenetic marks) not mapped genome-wide\", \"Integration of HNF-1α, HNF-4α, C/EBPβ, and SREBP-1 inputs at the endogenous locus not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extension of LILRB receptor signaling to cardiac and hepatic stellate cell contexts — ANGPTL8 binding LILRB3 suppresses cardiac hypertrophy via Akt/GSK3β inhibition, while ANGPTL8 binding LILRB2 activates stellate cells via ERK to promote fibrosis — broadened the receptor-mediated signaling paradigm beyond circadian entrainment.\",\n      \"evidence\": \"ANGPTL8 KO in Ang II/TAC cardiac models with IP-MS receptor identification and siRNA/blocking antibody confirmation; KO in HFD/CCl4 liver models with AAV8 rescue and Co-IP for LILRB2\",\n      \"pmids\": [\"35851270\", \"36031141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity determinants for LILRB2 vs LILRB3 binding unknown\", \"Whether different LILRB family members produce opposing downstream effects in the same tissue not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Human genetic mimicry analysis established that the ANGPTL3–ANGPTL8 complex inhibits endothelial lipase in addition to LPL, with the R59W variant differentially affecting EL versus LPL inhibition, extending the target range of the complex beyond LPL.\",\n      \"evidence\": \"Variant-specific metabolite profiling in >110,000 UK Biobank individuals and 11 European cohorts\",\n      \"pmids\": [\"36372100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct enzymatic assay confirming EL inhibition by the purified complex\", \"Structural basis for differential R59W effects on EL vs LPL not determined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Neuron-specific ANGPTL8 knockout demonstrated a brain-intrinsic role for ANGPTL8 in diabetic neuroinflammation and synaptic loss via PirB signaling, extending ANGPTL8's paracrine LILRB-mediated functions to the central nervous system.\",\n      \"evidence\": \"Neuron-specific Angptl8 KO and PirB-/- mice, behavioral testing, synaptic marker and cytokine measurement\",\n      \"pmids\": [\"39095838\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether neuronal ANGPTL8 has physiological roles outside diabetic pathology unknown\", \"Downstream signaling cascade from PirB in neurons not fully mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of the ANGPTL3–ANGPTL8 complex and how it differentially inhibits LPL versus endothelial lipase; the molecular mechanism by which adipose ANGPTL8 suppresses ANGPTL4; the selectivity determinants for LILRB2 versus LILRB3 receptor engagement; and how intracellular (NF-κB/autophagy, SREBP1) and extracellular (LPL inhibition, LILRB signaling) functions are coordinated from a single gene product.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of ANGPTL3–ANGPTL8 complex\", \"Mechanism of ANGPTL4 suppression by ANGPTL8 at the molecular level undefined\", \"Partitioning of ANGPTL8 between secreted and intracellular pools not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 3, 5, 8, 21]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [6, 10, 11, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 2, 3, 5, 8, 10, 11]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 9, 30]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 2, 3, 5, 8, 12, 13, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6, 10, 11, 14, 15, 22, 28]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 24, 28]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [4, 28]}\n    ],\n    \"complexes\": [\n      \"ANGPTL3-ANGPTL8 complex\"\n    ],\n    \"partners\": [\n      \"ANGPTL3\",\n      \"ANGPTL4\",\n      \"LILRB2\",\n      \"LILRB3\",\n      \"IKBKG\",\n      \"SQSTM1\",\n      \"SREBF1\",\n      \"LPL\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}