{"gene":"LRP8","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2005,"finding":"ApoER2 is present in postsynaptic densities of excitatory synapses where it forms a functional complex with NMDA receptors. Reelin signaling through ApoER2 enhances LTP through a mechanism requiring amino acids encoded by an alternatively spliced exon (exon 19) in the intracellular domain, which is required for Reelin-induced tyrosine phosphorylation of NMDA receptor subunits.","method":"Co-immunoprecipitation, postsynaptic density fractionation, alternative splicing analysis, LTP electrophysiology, behavioral learning/memory tasks in knock-in mice","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, biochemical fractionation, electrophysiology, and in vivo behavioral rescue with multiple orthogonal methods in one rigorous study","pmids":["16102539"],"is_preprint":false},{"year":2000,"finding":"ApoER2, but not VLDLR, binds JNK-interacting proteins (JIP-1 and JIP-2), which act as molecular scaffolds for the JNK signaling pathway. The ApoER2 binding domain on JIP-2 does not overlap with binding sites for MLK3, MKK7, and JNK, allowing ApoER2 to assemble a multiprotein complex containing Disabled-1 and JIPs at the neuronal cell surface.","method":"Co-immunoprecipitation, yeast two-hybrid, domain mapping","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and domain mapping, single lab but multiple orthogonal methods","pmids":["10827199"],"is_preprint":false},{"year":2003,"finding":"Purified Reelin binds directly to ApoER2 and VLDLR to induce tyrosine phosphorylation of Disabled-1 (Dab1). ApoER2 shows greater Reelin-binding affinity than VLDLR. Complete absence of both receptors abolishes Reelin-induced Dab1 phosphorylation in cortical neurons.","method":"Purified Reelin binding assay, Dab1 phosphorylation immunoblot, genetic knockout mice, cortical neuron cultures","journal":"Brain research. Molecular brain research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding with purified proteins, genetic null validation, replicated across receptor genotypes","pmids":["12670700"],"is_preprint":false},{"year":2007,"finding":"PCSK9 induces degradation of ApoER2 (as well as LDLR and VLDLR) either via cellular co-expression or re-internalization of secreted PCSK9. This degradation does not require PCSK9 catalytic activity and is directed to late endosomes/lysosomes. Membrane-bound PCSK9 chimeras are more efficient at degrading ApoER2 than secreted PCSK9.","method":"Cell co-expression, secreted protein re-internalization, lysosomal targeting assays, catalytically inactive mutant PCSK9, immunoblotting","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro gain/loss of function, active-site mutagenesis, multiple experimental conditions in one rigorous study","pmids":["18039658"],"is_preprint":false},{"year":2007,"finding":"ApoER2 mediates selenium uptake from selenoprotein P (Sepp1) in the mouse testis. Sertoli cells express ApoER2 as the Sepp1 receptor; apoER2-deficient males show sharply reduced testis selenium and identical sperm defects to Sepp1-deficient males. Co-immunoprecipitation confirmed ApoER2-Sepp1 interaction.","method":"Sepp1 affinity chromatography, mass spectrometry, co-immunoprecipitation, ApoER2 knockout mice, in situ hybridization, immunocytochemistry, selenium measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — affinity chromatography with MS identification, co-IP, genetic knockout validation, multiple orthogonal methods","pmids":["17314095"],"is_preprint":false},{"year":2008,"finding":"ApoER2 and Dab1 are required for postnatal chain migration of neuronal precursors from the subventricular zone to the olfactory bulb in a Reelin-independent manner. Mice lacking both ApoER2 and VLDLR, or Dab1, showed severely compromised chain formation and virtual absence of the rostral migratory stream.","method":"Genetic knockout mice, organotypic migration assay, immunohistochemistry, neuroanatomical analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with defined phenotypic readout, replicated across multiple genotypes","pmids":["17494763"],"is_preprint":false},{"year":2008,"finding":"Thrombospondin-1 (THBS-1) is a novel physiological ligand for ApoER2 and VLDLR. THBS-1 binds ApoER2 and VLDLR and induces phosphorylation of Dab1 but, unlike Reelin, does not induce Dab1 degradation or Akt phosphorylation. THBS-1 stabilizes neuronal precursor chains in the rostral migratory stream.","method":"Ligand binding assay, Dab1 phosphorylation immunoblot, THBS-1 knockout mice, subventricular zone explant cultures","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding assay, signaling assays with genetic null validation, orthogonal methods in single study","pmids":["18946489"],"is_preprint":false},{"year":2005,"finding":"F-spondin interacts with ApoER2 through its thrombospondin domain binding to the ApoER2 ligand-binding domain. Full-length F-spondin increases ApoER2-APP co-immunoprecipitation, increases surface expression of both, promotes cleavage of APP and ApoER2, and decreases Aβ production in a RAP-inhibitable manner.","method":"Co-immunoprecipitation, surface biotinylation, RAP-inhibition assay, cell transfection, primary neuron cultures","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, functional assays with pharmacological inhibition, single lab with multiple methods","pmids":["16227578"],"is_preprint":false},{"year":2008,"finding":"Activated protein C (APC) binds directly and with high affinity (Kd ~30 nM) to ApoER2 (but not VLDLR) via a surface plasmon resonance-measured interaction. APC ligation of ApoER2 induces rapid phosphorylation of Dab1 Tyr-220 and Akt Ser-473, with downstream GSK3β Ser-9 phosphorylation via PI3K. siRNA knockdown of ApoER2 abolishes APC-induced Dab1 phosphorylation.","method":"Surface plasmon resonance, siRNA knockdown, phospho-specific immunoblotting, PI3K inhibitor, RAP blocking","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — SPR binding measurement, siRNA knockdown, pharmacological pathway inhibition with multiple orthogonal methods","pmids":["19116273"],"is_preprint":false},{"year":2010,"finding":"The E3 ubiquitin ligase IDOL induces ubiquitination of ApoER2 and VLDLR on their cytoplasmic tails, leading to their degradation. LXR activation increases IDOL expression and decreases VLDLR levels in vivo. LXR activation reduces Reelin binding to VLDLR and Dab1 phosphorylation, functionally linking LXR and Reelin signaling.","method":"Ubiquitination assay, cell overexpression, siRNA knockdown, pharmacological LXR activation in mice, Dab1 phosphorylation immunoblot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct ubiquitination assay, in vivo mouse pharmacology, functional downstream signaling readouts in single study","pmids":["20427281"],"is_preprint":false},{"year":2010,"finding":"Antiphospholipid antibodies (aPL) promote leukocyte-endothelial adhesion and thrombosis through ApoER2-dependent antagonism of eNOS. The mechanism involves β2GPI dimerization leading to attenuated eNOS Ser1179 phosphorylation via protein phosphatase 2A. ApoER2-/- mice are protected from aPL inhibition of eNOS, leukocyte adhesion, and thrombus formation in vivo.","method":"ApoER2 knockout mice, in vivo carotid conductance assay, eNOS phosphorylation immunoblot, PP2A activity assay, monocyte adhesion assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with multiple in vivo and in vitro phenotypic readouts, mechanism defined through PP2A","pmids":["21123944"],"is_preprint":false},{"year":2012,"finding":"ApoER2 (LRP8) on endothelial cells serves as the receptor for cancer-secreted ApoE to suppress metastatic endothelial recruitment (MER) and angiogenesis. ApoE engagement of endothelial LRP8 (not LRP1) suppresses angiogenesis, and miRNAs that suppress ApoE promote metastasis via this pathway.","method":"In vivo selection, siRNA knockdown, locked nucleic acid miRNA inhibition, endothelial recruitment assays, xenograft metastasis models","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown with defined phenotype, in vivo models, single lab","pmids":["23142051"],"is_preprint":false},{"year":2012,"finding":"PCSK9 potentiates neuronal apoptosis by reducing ApoER2 protein levels. RNAi-mediated knockdown of PCSK9 increases ApoER2 levels and reduces neuronal apoptosis; knockdown of ApoER2 (but not VLDLR) reverses this protection. PCSK9 regulates neuronal apoptosis via ApoER2-associated ERK and JNK signaling independently of NMDA receptor function.","method":"RNAi knockdown, apoptosis assays (caspase-3, p-c-Jun), pharmacological signaling pathway inhibition, cerebellar granule neuron culture","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown with defined apoptotic phenotype, receptor-specific rescue, single lab","pmids":["22481440"],"is_preprint":false},{"year":2005,"finding":"ApoER2 undergoes endocytosis via a clathrin-mediated pathway dependent on its cytoplasmic FxNPXY motif, which mediates binding to the adaptor protein Dab2. Dominant-negative eps15 and Dab2 decrease ApoER2 internalization. Lipid raft association of ApoER2 does not determine its endocytic pathway.","method":"Dominant-negative expression, nystatin treatment, clathrin inhibition, receptor internalization assay, co-immunoprecipitation with Dab2","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative constructs, pharmacological inhibition, Co-IP, multiple orthogonal methods in single lab","pmids":["16101684"],"is_preprint":false},{"year":2009,"finding":"ApoER2 and VLDLR have divergent receptor fates upon Reelin stimulation linked to their differential sorting to raft vs. non-raft membrane domains. VLDLR (non-raft) endocytoses and degrades Reelin via clathrin/endosome pathway without receptor degradation. ApoER2 (raft-resident) generates specific receptor fragments and is degraded via lysosomes, contributing to negative feedback loops.","method":"Chimeric receptor constructs, lipid raft fractionation, Reelin endocytosis assay, lysosomal degradation assay, immunoblotting","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chimeric receptor domain-swap approach, raft fractionation, functional assays, single lab","pmids":["19948739"],"is_preprint":false},{"year":2009,"finding":"Coagulation factor XI (FXI) is a ligand for platelet ApoER2. Platelet adhesion to FXI is abrogated by soluble recombinant ApoER2, RAP, or LDL-binding domain 1 or 2 of ApoER2. ApoER2-deficient murine platelets fail to adhere to FXI. Soluble FXI binds immobilized ApoER2 with an affinity of 61 nM.","method":"Platelet adhesion assay, ApoER2-deficient mice, surface plasmon resonance binding measurement, RAP inhibition, recombinant domain deletion mutants","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative binding measurement, genetic null validation, domain deletion analysis, multiple orthogonal methods","pmids":["19661487"],"is_preprint":false},{"year":2005,"finding":"β2-Glycoprotein I (β2GPI) binds platelet ApoER2 via domain V of dimeric β2GPI. Domain V deletion mutants lacking the phospholipid-insertion loop fail to bind ApoER2 or increase platelet adhesion to collagen, while domain I and II deletion mutants retain ApoER2 binding.","method":"Domain deletion mutants of β2GPI, immunoprecipitation, platelet adhesion assay in whole blood","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion mapping with functional readout, Co-IP, single lab","pmids":["16091370"],"is_preprint":false},{"year":2012,"finding":"ApoER2 (LRP8) mediates Wnt/β-catenin signaling and controls osteoblast differentiation. LRP8 knockdown decreases β-catenin levels and suppresses Wnt-induced Axin2 transcription and osteoblast mineralization; LRP8 ectopic expression promotes Wnt-induced β-catenin accumulation and osteoblast differentiation.","method":"siRNA knockdown, ectopic overexpression, Wnt reporter assay, immunoblotting for β-catenin, osteoblast differentiation assay, KS483 osteoprogenitor cells","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and overexpression with functional differentiation readout, multiple methods, single lab","pmids":["22589174"],"is_preprint":false},{"year":2015,"finding":"Reelin binding to LRP8 triggers activation of a cohort of neuronal enhancers (LRN enhancers) via a synapse-to-nucleus pathway. This requires γ-secretase-dependent cleavage of LRP8 releasing its intracellular domain (ICD), which regulates synaptically generated signals. LRP8 ICD participates in transcriptional regulation of synaptic plasticity genes underlying memory formation.","method":"In vivo ChIP-seq enhancer mapping, γ-secretase inhibition, LRP8 ICD nuclear fractionation, mouse learning/memory behavioral assays, NMDA-receptor signaling assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo ChIP-seq, γ-secretase mutagenesis/inhibition, nuclear fractionation, behavioral phenotyping with multiple orthogonal methods","pmids":["25892301"],"is_preprint":false},{"year":2014,"finding":"Sorting nexin 17 (SNX17) interacts with the NPxY endocytosis motif of ApoER2 via its FERM domain and stimulates ApoER2 recycling from early to recycling endosomes without affecting endocytic rate. SNX17 knockdown increases Reelin-induced ApoER2 degradation and reduces dendritic tree development and Reelin signaling in hippocampal neurons.","method":"GST pull-down, co-immunoprecipitation, ApoER2 recycling assay, siRNA knockdown, neuronal culture morphology, Dab1 phosphorylation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pull-down domain mapping, Co-IP, functional trafficking assays, neuronal phenotype, single lab","pmids":["24705369"],"is_preprint":false},{"year":2013,"finding":"Clusterin binds directly to ApoER2 and VLDLR and is internalized by cells expressing either receptor. Clusterin binding triggers a Reelin-like signal, inducing Dab1 phosphorylation and PI3K/Akt and n-cofilin activation. Blocking clusterin in SVZ explants compromises cell proliferation and neuroblast chain formation.","method":"Ligand binding/internalization assay, Dab1 phosphorylation immunoblot, PI3K/Akt immunoblot, SVZ explant culture, clusterin blocking antibody","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding and internalization, signaling assays, functional SVZ assay, single lab","pmids":["24381170"],"is_preprint":false},{"year":2014,"finding":"Apoer2 lacking exon 16 (O-linked sugar domain) shows reduced extracellular cleavage and consequently impaired γ-secretase-dependent release of the ApoER2 intracellular domain. Mice expressing this variant show increased ApoER2 abundance, altered hippocampal spine density, glutamate receptor abundance, and synaptic efficacy.","method":"Knock-in mice, proteolytic cleavage assay, spine density quantification, glutamate receptor immunoblot, hippocampal LTP electrophysiology, behavioral tests","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo knock-in model, proteolytic processing assay, electrophysiology, and behavioral phenotyping with multiple orthogonal methods","pmids":["25429077"],"is_preprint":false},{"year":2013,"finding":"Presenilin 1 (PS1)/γ-secretase processes ApoER2 to generate an intracellular C-terminal fragment (CTF). The ApoER2 CTF binds to the RELN promoter region and suppresses reelin transcription at the transcriptional level. PS1 conditional knockout mice show increased ApoER2 and reelin protein levels.","method":"PS1 conditional knockout mice, luciferase reporter assay, nuclear fractionation, chromatin immunoprecipitation (ChIP), pharmacological γ-secretase inhibition","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP demonstrating CTF-promoter binding, in vivo PS1 KO, reporter assay, nuclear fractionation, multiple orthogonal methods","pmids":["24344333"],"is_preprint":false},{"year":2017,"finding":"ApoER2 ectodomain adopts an intermediate contracted-open conformation when complexed with the signaling-competent Reelin fragment at neutral pH, different from LDLR. Crystallographic analysis identifies an auxiliary low-affinity binding interface; pH shift during endocytosis weakens this auxiliary interface and destabilizes the ligand-receptor complex, priming ligand release prior to internalization.","method":"X-ray crystallography of full-length ApoER2 ectodomain-Reelin fragment complex, mutational analysis, pH-dependent binding assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure determination with mutational validation, defines mechanism at atomic resolution","pmids":["28446613"],"is_preprint":false},{"year":2018,"finding":"The apoER2 cytoplasmic tail serves as a scaffold for aPL-induced assembly and activation of heterotrimeric PP2A in endothelial cells. Dab2 recruitment to the apoER2 NPXY motif promotes activating L309 methylation of the PP2A catalytic subunit by leucine methyl transferase-1. SHC1 recruits PP2A scaffolding subunit to the proline-rich apoER2 C-terminus, mediating inhibitory dephosphorylation of Akt and eNOS. This apoER2-Dab2-SHC1 complex underlies aPL-invoked thrombosis in mice.","method":"Co-immunoprecipitation, endothelial cell PP2A activity assay, site-specific mutational analysis of apoER2 domains, mouse thrombosis model, apoER2 knockout mice","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with domain-specific mapping, PP2A activity, in vivo KO validation, multiple orthogonal methods in single rigorous study","pmids":["29500169"],"is_preprint":false},{"year":2019,"finding":"ApoER2 participates in APC (anaphase-promoting complex)/CDC20 complex formation during mitosis. In apoER2-deficient smooth muscle cells, PP2A-C fails to interact with CDC20, resulting in inactive APC and impaired cytokinesis abscission, leading to cell cycle arrest at metaphase/anaphase and premature cell senescence.","method":"Co-immunoprecipitation of apoER2 with PP2A catalytic subunit and CDC20, cell cycle protein immunoblotting, β-galactosidase senescence assay, p16INK4a immunofluorescence, Lrp8 knockout mice","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction, genetic null with defined senescence phenotype, cell cycle protein analysis, single lab","pmids":["31412739"],"is_preprint":false},{"year":2009,"finding":"The signaling motifs in the Apoer2 cytoplasmic domain are functionally dissociable from Sepp1 (selenoprotein P) uptake. Knock-in mice with signaling-impaired Apoer2 cytoplasmic domain mutations have normal brain and testis selenium concentrations, demonstrating that neurological defects in these mice result from disrupted Reelin signaling, not impaired selenium uptake.","method":"Knock-in mice with cytoplasmic domain mutations, selenium concentration measurement in tissues, neurological phenotyping, sperm motility analysis","journal":"Biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — genetic knock-in domain-swap dissociation with quantitative biochemical readouts in multiple tissues","pmids":["19007311"],"is_preprint":false},{"year":2012,"finding":"Long isoform selenoprotein P (Sepp1) is taken up by L8 myoblast cells via an apoER2-mediated mechanism requiring binding to heparin sulfate proteoglycans. siRNA knockdown of apoER2 (but not Lrp1) inhibits 75Se uptake from Sepp1. Lysosomal acidification is required for Sepp1 digestion and selenium utilization but not for Sepp1 uptake itself.","method":"siRNA knockdown, 75Se radiolabeled uptake assay, affinity chromatography with mass spectrometry, protamine/chlorate treatment, lysosomal acidification inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — receptor-specific siRNA KD with isotopic selenium uptake quantification, affinity chromatography with MS identification","pmids":["22761431"],"is_preprint":false},{"year":2006,"finding":"FE65 interacts with ApoER2 via its N-terminal PTB domain, acting as an intracellular bridge between ApoER2 and APP. Full-length FE65 increases surface expression of ApoER2, increases secreted APP and ApoER2 forms, and decreases Aβ production. Both PTB domains of FE65 must be present simultaneously for effects on APP/ApoER2 processing.","method":"Co-immunoprecipitation, surface protein biotinylation, live cell staining, COS7 cell transfection, Aβ ELISA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP domain mapping, surface biotinylation, functional processing assay, single lab","pmids":["16638748"],"is_preprint":false},{"year":2007,"finding":"ApoER2 expression increases APP association with lipid rafts, promotes gamma-secretase activity, and increases Aβ production while decreasing APP internalization. The increased Aβ production is dependent on the integrity of the NPxY endocytosis motif of ApoER2. ApoER2 physically interacts and co-localizes with APP.","method":"Co-immunoprecipitation, APP internalization rate assay, lipid raft fractionation, gamma-secretase activity assay, Aβ ELISA, NPxY motif mutagenesis","journal":"Molecular neurodegeneration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, lipid raft fractionation, NPxY mutagenesis with functional readout, multiple methods, single lab","pmids":["17620134"],"is_preprint":false},{"year":2014,"finding":"ApoE3 binding to ApoER2 stimulates eNOS, promotes endothelial cell migration, and attenuates monocyte-endothelial adhesion in endothelial cells. ApoE4 does not stimulate eNOS or migration and selectively antagonizes ApoE3/ApoER2 actions, requiring the N-terminal to C-terminal interaction that distinguishes ApoE4 from ApoE3. The LRP8 R952Q variant is a loss-of-function variant of ApoER2 in endothelium; ApoER2-/- mice show decreased carotid reendothelialization and exaggerated neointima formation.","method":"eNOS activity assay, endothelial cell migration assay, monocyte adhesion assay, ApoER2 knockout mouse carotid reendothelialization, neointima formation model, adenoviral apoE expression","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO mouse models, functional endothelial assays, reconstitution experiments, multiple orthogonal methods replicated in vivo","pmids":["25197062"],"is_preprint":false},{"year":2017,"finding":"The E3 ubiquitin ligase IDOL determines synaptic ApoER2 protein levels in response to neuronal activation and regulates dendritic spine morphogenesis. IDOL-dependent ApoER2 ubiquitination modulates filopodia initiation and synapse maturation. IDOL knockout in neurons causes ApoER2 overexpression, impaired activity-dependent spine remodeling, and defective LTP.","method":"IDOL knockout neurons, ApoER2 protein level immunoblot, dendritic spine imaging, hippocampal LTP electrophysiology, experience-dependent barrel cortex plasticity assay, learning/memory behavioral tests","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple orthogonal readouts including electrophysiology, structural plasticity, and in vivo behavioral tests","pmids":["28891791"],"is_preprint":false},{"year":2017,"finding":"GRIP1 binds ApoER2 and bridges a complex including ApoER2, ephrinB2, and AMPA receptors at the postsynapse. Neuronal activity induces ApoER2-ephrinB2 association; phosphorylation of ephrinB2 Ser-9 is essential for complex stability. In vivo mutation of ephrinB2 Ser-9 disrupts the complex, eliminates ApoER2 downstream signaling, and impairs activity-induced AMPA receptor insertion and LTP.","method":"Co-immunoprecipitation, knock-in ephrinB2 Ser-9 mutant mice, AMPA receptor surface insertion assay, hippocampal LTP electrophysiology, compound genetics","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, in vivo knock-in validation, electrophysiology, and receptor trafficking assays with compound genetics","pmids":["28978486"],"is_preprint":false},{"year":2016,"finding":"Antisense oligonucleotide (ASO)-mediated correction of ApoER2 exon 19 splicing in Alzheimer's disease mice improves synaptic function and learning/memory. The balance of ApoER2 exon 19 splicing is deregulated in AD patient postmortem brain tissue. Exon 19 is required for ApoER2 signaling.","method":"ASO treatment in AD transgenic mice, splice variant analysis in human postmortem brain, synaptic function electrophysiology, Morris water maze behavioral testing","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — therapeutic ASO with defined splicing correction and functional behavioral rescue, translational human tissue validation, single lab","pmids":["26902204"],"is_preprint":false},{"year":2016,"finding":"Presenilin-1 (PS1) mutations alter ApoER2 processing and trafficking. PS1 mutation R278I impairs γ-secretase cleavage of ApoER2 at baseline and after Reelin treatment. PS1 L282V mutation reduces cell-surface levels of ApoER2 without affecting total levels, indicating a trafficking defect. PS1 M146V permits accumulation of ApoER2 CTFs after Reelin treatment.","method":"PS1 mutant cell lines, ApoER2 CTF immunoblot, cell-surface protein biotinylation, γ-secretase inhibitor treatment, Reelin stimulation","journal":"Neurobiology of aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific PS1 mutants with surface biotinylation and cleavage assays, single lab","pmids":["27810638"],"is_preprint":false},{"year":2015,"finding":"ApoER2 and Reelin are expressed in regenerating peripheral nerves and regulate Schwann cell migration. Reelin activates Rac1 at the leading edge of Schwann cells (detected by FRET). ApoER2 exon-19-containing splice variant (with proline-rich insert) binds PAR3. Tiam1, a Rac1-specific GEF, is required for Reelin-induced Schwann cell migration, and PAR3 associates with Tiam1 and ApoER2.","method":"FRET experiments for Rac1 activation, co-immunoprecipitation of ApoER2-PAR3, siRNA knockdown of Tiam1/PAR3/ApoER2, Schwann cell migration assay, peripheral nerve injury model","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET, Co-IP, siRNA with functional migration readout, single lab with multiple methods","pmids":["26386179"],"is_preprint":false},{"year":2019,"finding":"ApoER2 homo- and hetero-oligomers are formed in the absence of Reelin. Full-length Reelin binding rearranges ApoER2 homo-oligomers into higher-order receptor clusters, which leads to Dab1 phosphorylation. Binding of the central Reelin fragment does not increase cluster size and does not induce Dab1 phosphorylation, but can induce ApoER2 hetero-oligomerization with VLDLR without triggering the canonical signal.","method":"Time-resolved fluorescence anisotropy, fluorescence lifetime imaging microscopy (FLIM), FRET, HEK293 cells expressing tagged receptors","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — FLIM/FRET structural analysis, single lab with quantitative biophysical readout","pmids":["30873003"],"is_preprint":false},{"year":2021,"finding":"VLDLR and ApoER2 (LRP8) are functional entry receptors for multiple alphaviruses including Semliki forest virus, eastern equine encephalitis virus, and Sindbis virus. The alphavirus E2-E1 glycoproteins interact with the ligand-binding domains of VLDLR and ApoER2. VLDLR LBD-Fc fusion protein blocks virus infection in cell culture and protects mice from lethal challenge.","method":"Ectopic receptor expression facilitating viral entry, virus-like particle internalization assay, LBD-Fc blocking experiments, mouse lethal challenge model","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted entry assay with ectopic expression, domain-specific blocking, in vivo mouse protection, multiple orthogonal methods","pmids":["34929721"],"is_preprint":false},{"year":2023,"finding":"LRP8 is a key determinant protecting MYCN-amplified neuroblastoma cells from ferroptosis by mediating selenoprotein P (SELENOP) uptake to supply selenocysteine required for GPX4 translation. Genetic deletion of LRP8 causes ferroptosis due to insufficient selenocysteine supply; this dependency is specific to cells with low expression of alternative selenium uptake pathways (system Xc-).","method":"CRISPR activation screen, LRP8 knockout (constitutive and inducible) in orthotopic xenografts, ferroptosis assays, GPX4 immunoblot, selenium uptake assay","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-scale CRISPR screen, genetic KO with in vivo xenograft validation and mechanistic pathway confirmation, multiple methods","pmids":["37435859"],"is_preprint":false},{"year":2009,"finding":"Splice variants of ApoER2 with different numbers of ligand-binding type A (LA) repeats (LA1237 vs. LA12378) differ in Reelin-binding affinity. LA8 and Reelin repeat 8 (RR8) interfere with the interaction between the central Reelin fragment and ApoER2. Proteolytic cleavage of Reelin and alternative splicing of ApoER2 contribute to fine regulation of Reelin signaling.","method":"Quantitative binding assay between Reelin isoforms/fragments and ApoER2 splice variants, monoclonal antibody specificity, primary cortical neuron signaling assays","journal":"Neuroscience research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct quantitative binding assays with purified protein variants, domain-level analysis, single lab","pmids":["19167437"],"is_preprint":false},{"year":2025,"finding":"LRP8 is a receptor for tick-borne encephalitis virus (TBEV). LRP8 downregulation reduces TBEV infection in human cells and overexpression enhances it. LRP8 binds directly to the TBEV E glycoprotein and mediates viral attachment and internalization. An LRP8-based soluble decoy blocked TBEV infection in human cell lines and neuronal cells and protected mice from lethal challenge.","method":"Genome-scale CRISPR-Cas9 screen, LRP8 overexpression/knockdown, direct LRP8-E glycoprotein binding assay, viral attachment/internalization assay, LRP8 soluble decoy in cell culture and mouse lethal challenge","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — CRISPR screen identification validated by overexpression/knockdown, direct protein binding, and in vivo mouse protection with soluble decoy","pmids":["40993380"],"is_preprint":false},{"year":2014,"finding":"NGF-induced TrkA activation in PC12 cells induces ApoER2 proteolytic processing via metalloproteinase activity, independently of MAPK and PI3K. In primary cortical neurons, BDNF (TrkB ligand) also regulates ApoER2 proteolysis. Reelin regulates proteolysis of its own receptor ApoER2 but does not affect p75NTR processing.","method":"TrkA/TrkB activation in cell lines and primary neurons, metalloproteinase inhibitors, MAPK/PI3K pharmacological inhibition, ApoER2 shedding/CTF immunoblot","journal":"BMC neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with defined processing readout, neurotrophin-specific receptor cross-regulation, single lab","pmids":["25233900"],"is_preprint":false},{"year":2022,"finding":"Human APOER2 isoforms lacking different numbers of ligand-binding repeats generate differential amounts of C-terminal fragments (CTFs) in response to ApoE peptide. Isoform Δex5-8 generates the highest CTF; Δex4-6 generates the lowest. Differential CTF generation correlates with proteolytic release of the transcriptionally active ICD (mediated via Mint1 adaptor). Loss of mouse Apoer2 decreases miniature excitatory event frequency; rescue with human APOER2-FL or Δex4-6 (but not Δex5-8) restores this frequency.","method":"Identification of 25 human APOER2 isoforms by gene-specific PCR sequencing, CTF immunoblot, ICD nuclear fractionation, Mint1 interaction assay, Apoer2 knockout neurons with lentiviral rescue, miniature EPSC recordings","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific cleavage assays, genetic KO with lentiviral rescue, electrophysiology, single lab with multiple orthogonal methods","pmids":["35414534"],"is_preprint":false},{"year":2023,"finding":"An ApoER2 variant with a highly glycosylated O-linked sugar domain has a high affinity for SeP (Kd = 0.67 nM) in Jurkat cells. This high-affinity variant mediates selenium transport via SeP through a selenocysteine lyase-independent pathway, in contrast to the Sec lyase-dependent degradation pathway in low-affinity cells. Acidification of intracellular vesicles is necessary for selenium transport via SeP in both cell types.","method":"ApoER2 variant characterization, SeP binding affinity measurement, siRNA knockdown, 75Se uptake assay, selenocysteine lyase inhibition, lysosomal acidification inhibition","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative binding measurement, siRNA knockdown, isotopic selenium transport assay, mechanistic pathway dissection, single lab","pmids":["37406814"],"is_preprint":false},{"year":2013,"finding":"Dab1 mediates colocalization of multi-adaptor CIN85 with ApoER2 in neurons. Stimulation with active Reelin fragment recruits CIN85 to plasma membrane domains where it colocalizes with ApoER2 and Dab1, then moves to EEA1-labeled early endosomes. Tyrosine phosphorylation of Dab1 strengthens its binding to CIN85.","method":"Co-immunoprecipitation, immunofluorescence colocalization, Reelin stimulation, endosome marker co-localization, phospho-Dab1 binding assay","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, live and fixed imaging colocalization with endosomal markers, Reelin-stimulation dynamics, single lab","pmids":["23506116"],"is_preprint":false},{"year":2021,"finding":"ApoER2 (apoER2) activation by PP2A in trophoblasts driven by antiphospholipid antibodies promotes preeclampsia in a mouse model of antiphospholipid syndrome, demonstrating ApoER2-PP2A signaling in trophoblasts as a mechanistic driver of preeclampsia pathogenesis.","method":"Mouse model of antiphospholipid syndrome, trophoblast-specific genetic approaches, PP2A activity assays, preeclampsia phenotypic readouts","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with mechanistic PP2A-ApoER2 pathway placement, single lab","pmids":["34404233"],"is_preprint":false}],"current_model":"LRP8/ApoER2 is a multifunctional transmembrane receptor of the LDL receptor family that operates as a signal transducer and endocytic receptor: it binds Reelin, clusterin, thrombospondin-1, ApoE, selenoprotein P, activated protein C, factor XI, β2-glycoprotein I, and viral glycoproteins, transducing signals primarily through Dab1 tyrosine phosphorylation and downstream PI3K/Akt, JNK, and ERK pathways; its cytoplasmic NPxY motif mediates clathrin-dependent endocytosis via Dab2, while its proline-rich insert recruits JIP scaffold proteins; γ-secretase-dependent cleavage releases a transcriptionally active ICD; PCSK9 and IDOL ubiquitin ligase regulate ApoER2 protein levels post-translationally; the receptor is subject to extensive alternative splicing that differentially regulates Reelin binding, proteolytic processing, and synaptic function; in the brain it controls neuronal migration and layer formation, synaptic plasticity, LTP, and memory; in endothelium it mediates eNOS regulation and thrombosis via a PP2A–Dab2–SHC1 complex; in the testis and brain it mediates selenoprotein P–dependent selenium uptake; and in cancer cells it drives Wnt/β-catenin signaling and ferroptosis resistance through selenocysteine supply for GPX4 synthesis."},"narrative":{"mechanistic_narrative":"LRP8/ApoER2 is a multifunctional LDL-receptor-family transmembrane protein that operates simultaneously as a signal transducer, endocytic/recycling receptor, and selenium-uptake receptor across the nervous, vascular, and reproductive systems [PMID:12670700, PMID:17314095, PMID:25892301]. In neurons it binds Reelin with high affinity and, upon ligand-induced clustering of pre-formed homo-oligomers, drives tyrosine phosphorylation of the adaptor Dab1 and downstream PI3K/Akt signaling, controlling neuronal precursor migration, dendritic and synaptic morphogenesis, LTP, and memory [PMID:12670700, PMID:30873003, PMID:17494763, PMID:28891791]; structural work shows the receptor ectodomain adopts a contracted-open conformation with a pH-sensitive auxiliary interface that primes ligand release during endocytosis [PMID:28446613]. Beyond Reelin, ApoER2 is engaged by a broad ligand repertoire — thrombospondin-1, clusterin, F-spondin, ApoE, activated protein C, factor XI, β2-glycoprotein I, and selenoprotein P — that converge on Dab1 but produce distinct signaling outputs and receptor fates [PMID:18946489, PMID:24381170, PMID:16227578, PMID:25197062, PMID:19116273, PMID:19661487, PMID:16091370, PMID:17314095]. Signal output and trafficking are encoded in the cytoplasmic tail: an NPxY/FxNPXY motif mediates clathrin-dependent endocytosis through Dab2 and recycling through SNX17, while proline-rich and exon-19-encoded segments recruit JIP scaffolds and PAR3 [PMID:16101684, PMID:24705369, PMID:10827199, PMID:26386179]. γ-Secretase/presenilin-1 cleavage releases a transcriptionally active intracellular domain that activates neuronal enhancers and represses the RELN promoter, and this processing is tuned by extensive alternative splicing of the ligand-binding repeats and O-linked sugar domain [PMID:25892301, PMID:24344333, PMID:25429077, PMID:35414534]. Receptor abundance is set post-translationally by PCSK9-directed lysosomal degradation and IDOL-mediated ubiquitination, with PCSK9 promoting and IDOL controlling activity-dependent synaptic ApoER2 levels [PMID:18039658, PMID:22481440, PMID:20427281, PMID:28891791]. In endothelium and trophoblasts, the apoER2 tail scaffolds a Dab2–SHC1–PP2A complex that dephosphorylates eNOS and Akt, mediating antiphospholipid-antibody-driven thrombosis and preeclampsia [PMID:29500169, PMID:21123944, PMID:34404233]. ApoER2 also functions as the receptor for selenoprotein P-dependent selenium uptake required for spermatogenesis and for GPX4-dependent ferroptosis resistance in MYCN-amplified neuroblastoma, drives Wnt/β-catenin signaling in osteoblasts, and serves as an entry receptor for alphaviruses and tick-borne encephalitis virus [PMID:17314095, PMID:37435859, PMID:22589174, PMID:34929721, PMID:40993380].","teleology":[{"year":2000,"claim":"Established that ApoER2 is not merely an endocytic receptor but a signaling platform, by showing it selectively assembles JNK-scaffold proteins distinguishing it from VLDLR.","evidence":"Co-IP, yeast two-hybrid, and domain mapping of ApoER2-JIP1/JIP2 interactions","pmids":["10827199"],"confidence":"Medium","gaps":["Functional consequence of JIP/JNK assembly for neuronal signaling not measured in vivo","Does not address Reelin-dependence of complex formation"]},{"year":2003,"claim":"Resolved which receptors transduce the Reelin signal, demonstrating direct Reelin binding to ApoER2 and VLDLR drives Dab1 phosphorylation and that both are jointly required.","evidence":"Purified Reelin binding assays and Dab1 phosphorylation in receptor-null cortical neurons","pmids":["12670700"],"confidence":"High","gaps":["Downstream effectors of Dab1 not delineated here","Did not address ligand-specific receptor fate"]},{"year":2005,"claim":"Connected ApoER2 to synaptic plasticity, showing it sits in postsynaptic densities, complexes with NMDA receptors, and requires an alternatively spliced exon to enhance LTP and memory.","evidence":"PSD fractionation, Co-IP, knock-in mice, LTP electrophysiology and behavior","pmids":["16102539"],"confidence":"High","gaps":["Molecular mechanism linking exon-19 segment to NMDAR phosphorylation incompletely defined","Identity of the relevant kinase not established"]},{"year":2005,"claim":"Defined the endocytic machinery of ApoER2, mapping clathrin-mediated internalization to the cytoplasmic FxNPXY motif via the adaptor Dab2.","evidence":"Dominant-negative eps15/Dab2, clathrin inhibition, internalization and Co-IP assays","pmids":["16101684"],"confidence":"Medium","gaps":["Recycling versus degradative sorting not resolved","In vivo relevance not tested"]},{"year":2007,"claim":"Identified ApoER2 as a selenium-uptake receptor, showing it binds selenoprotein P in Sertoli cells and is required for testis selenium and normal spermatogenesis.","evidence":"Sepp1 affinity chromatography/MS, Co-IP, ApoER2-knockout mice, selenium measurement","pmids":["17314095"],"confidence":"High","gaps":["Intracellular fate of Sepp1-derived selenium not detailed","Whether signaling and uptake share receptor pools unresolved"]},{"year":2007,"claim":"Revealed post-translational control of receptor levels, showing PCSK9 targets ApoER2 to lysosomes in a catalysis-independent manner.","evidence":"Co-expression, secreted-protein re-internalization, catalytically inactive PCSK9, lysosomal targeting immunoblots","pmids":["18039658"],"confidence":"High","gaps":["Physiological tissue context of PCSK9 regulation not addressed here","Binding interface on ApoER2 not mapped"]},{"year":2008,"claim":"Expanded the ApoER2 ligand repertoire and showed ligand-specific signaling outcomes, with thrombospondin-1 inducing Dab1 phosphorylation but not Akt activation or Dab1 degradation, and stabilizing migrating neuroblast chains.","evidence":"Ligand binding, Dab1 phospho-immunoblot, THBS-1 knockout mice, SVZ explants","pmids":["18946489"],"confidence":"High","gaps":["Structural basis for differential signaling versus Reelin unknown","Receptor selectivity between ApoER2/VLDLR not dissected"]},{"year":2008,"claim":"Showed ApoER2 functions in Reelin-independent migration, with ApoER2/Dab1 required for SVZ-to-olfactory-bulb chain migration.","evidence":"Compound knockout mice, organotypic migration assay, neuroanatomy","pmids":["17494763"],"confidence":"High","gaps":["Ligand driving Reelin-independent migration not identified in this study","Signaling pathway downstream not mapped"]},{"year":2008,"claim":"Demonstrated ApoER2 as a vascular/coagulation signaling receptor, showing high-affinity activated protein C binding selectively to ApoER2 drives Dab1/Akt/GSK3β phosphorylation via PI3K.","evidence":"SPR binding, siRNA knockdown, phospho-immunoblots, PI3K inhibition","pmids":["19116273"],"confidence":"High","gaps":["In vivo vascular consequences not addressed in this study","Cell-type specificity of APC signaling not defined"]},{"year":2009,"claim":"Dissociated ApoER2's signaling and selenium-uptake functions, proving via cytoplasmic-domain knock-in mice that neurological defects arise from disrupted Reelin signaling, not impaired selenium uptake.","evidence":"Signaling-impaired cytoplasmic-domain knock-in mice with tissue selenium and neurological phenotyping","pmids":["19007311"],"confidence":"High","gaps":["Extracellular determinants of selenium uptake not mapped here","Does not address overlap in other tissues"]},{"year":2009,"claim":"Showed alternative splicing of ligand-binding repeats tunes Reelin affinity, establishing receptor isoform diversity as a regulatory layer.","evidence":"Quantitative binding of Reelin fragments to LA-repeat splice variants, neuron signaling assays","pmids":["19167437"],"confidence":"Medium","gaps":["In vivo significance of specific isoforms not tested","Single-lab binding analysis"]},{"year":2009,"claim":"Linked membrane microdomain sorting to divergent receptor fates, showing raft-resident ApoER2 generates fragments and is lysosomally degraded whereas VLDLR is not.","evidence":"Chimeric receptors, raft fractionation, Reelin endocytosis and degradation assays","pmids":["19948739"],"confidence":"Medium","gaps":["Negative feedback consequences only inferred","Single-lab domain-swap approach"]},{"year":2010,"claim":"Identified IDOL-mediated ubiquitination as a second post-translational control of ApoER2/VLDLR levels linking LXR to Reelin signaling.","evidence":"Ubiquitination assays, LXR pharmacology in mice, Dab1 phospho-readouts","pmids":["20427281"],"confidence":"High","gaps":["Neuronal physiological role addressed only later","Relative contribution of PCSK9 vs IDOL not compared"]},{"year":2010,"claim":"Defined the endothelial pathomechanism of antiphospholipid antibodies, showing ApoER2-dependent β2GPI-driven PP2A antagonism of eNOS underlies thrombosis.","evidence":"ApoER2-knockout mice, in vivo thrombosis, eNOS phospho-immunoblot, PP2A activity","pmids":["21123944"],"confidence":"High","gaps":["Molecular architecture of the PP2A scaffold not yet resolved (later defined)","Other antibody targets not excluded"]},{"year":2012,"claim":"Extended ApoER2 ubiquitin/degradation regulation to neuronal survival, showing PCSK9 promotes apoptosis by lowering ApoER2 and its ERK/JNK signaling.","evidence":"RNAi knockdown, caspase/apoptosis assays, signaling inhibition in cerebellar granule neurons","pmids":["22481440"],"confidence":"Medium","gaps":["Endogenous PCSK9 source in brain not defined","NMDAR-independence asserted but mechanism of ERK/JNK coupling unmapped"]},{"year":2012,"claim":"Placed ApoER2 in tumor-suppressive endothelial signaling, identifying it as the endothelial receptor for cancer-secreted ApoE that suppresses metastatic endothelial recruitment.","evidence":"In vivo selection, siRNA, miRNA inhibition, xenograft metastasis models","pmids":["23142051"],"confidence":"Medium","gaps":["Downstream signaling from ApoE-ApoER2 not delineated here","Single-lab study"]},{"year":2012,"claim":"Connected ApoER2 to Wnt/β-catenin-driven osteoblast differentiation, broadening its developmental signaling roles.","evidence":"siRNA/overexpression, Wnt reporter, β-catenin immunoblot, osteoblast mineralization","pmids":["22589174"],"confidence":"Medium","gaps":["Mechanism of Wnt-pathway coupling unknown","In vivo skeletal phenotype not shown"]},{"year":2012,"claim":"Refined selenium-uptake mechanism, showing ApoER2-mediated Sepp1 uptake requires heparan sulfate proteoglycans and that lysosomal acidification is needed for selenium utilization but not uptake.","evidence":"siRNA, 75Se uptake, affinity chromatography/MS, lysosomal inhibition in myoblasts","pmids":["22761431"],"confidence":"High","gaps":["HSPG identity not specified","Generalizability across cell types only partly tested"]},{"year":2013,"claim":"Showed γ-secretase-generated ApoER2 CTF acts as a transcriptional repressor of RELN, establishing a feedback loop between receptor processing and ligand expression.","evidence":"PS1 conditional knockout mice, ChIP, luciferase reporter, nuclear fractionation","pmids":["24344333"],"confidence":"High","gaps":["Cofactors enabling CTF promoter binding unidentified","Genomic breadth of CTF targets not mapped here"]},{"year":2013,"claim":"Added clusterin as a Reelin-mimetic ligand that triggers Dab1/PI3K/Akt/cofilin signaling and supports SVZ neuroblast chains.","evidence":"Binding/internalization, signaling immunoblots, SVZ explants with blocking antibody","pmids":["24381170"],"confidence":"Medium","gaps":["Binding interface on ApoER2 not mapped","Single-lab functional study"]},{"year":2013,"claim":"Mapped Reelin-induced adaptor dynamics, showing Dab1 phosphorylation recruits CIN85 to ApoER2 and traffics it to early endosomes.","evidence":"Co-IP, immunofluorescence colocalization with endosomal markers, phospho-Dab1 binding","pmids":["23506116"],"confidence":"Medium","gaps":["Functional output of CIN85 recruitment not defined","Single-lab imaging study"]},{"year":2014,"claim":"Identified SNX17 as a recycling factor that protects ApoER2 from Reelin-induced degradation and supports dendritic development.","evidence":"GST pull-down, Co-IP, recycling assay, siRNA, neuronal morphology, Dab1 phospho-assay","pmids":["24705369"],"confidence":"Medium","gaps":["In vivo requirement not tested","Single-lab study"]},{"year":2014,"claim":"Defined ApoE-isoform-specific endothelial signaling and a human loss-of-function variant, showing ApoE3-ApoER2 stimulates eNOS and migration while ApoE4 antagonizes it and the R952Q variant impairs function.","evidence":"eNOS/migration/adhesion assays, ApoER2-knockout reendothelialization and neointima models, adenoviral apoE","pmids":["25197062"],"confidence":"High","gaps":["Structural basis of ApoE3/E4 discrimination at receptor not resolved","Human variant studied functionally, not clinically"]},{"year":2014,"claim":"Showed neurotrophin signaling regulates ApoER2 proteolysis, with TrkA/TrkB activation inducing metalloproteinase-dependent shedding independent of MAPK/PI3K.","evidence":"TrkA/TrkB activation, metalloproteinase and pathway inhibitors, CTF immunoblot","pmids":["25233900"],"confidence":"Medium","gaps":["Identity of the responsible sheddase not established","Downstream transcriptional consequence not measured"]},{"year":2014,"claim":"Established the O-linked sugar domain (exon 16) as a regulator of receptor cleavage and synaptic output, with its absence reducing cleavage and altering spine density and synaptic efficacy in vivo.","evidence":"Knock-in mice, cleavage assays, spine quantification, LTP electrophysiology, behavior","pmids":["25429077"],"confidence":"High","gaps":["Mechanism by which cleavage controls synaptic strength not fully resolved","Sheddase responsible not identified here"]},{"year":2015,"claim":"Defined a synapse-to-nucleus pathway whereby Reelin-induced, γ-secretase-dependent ApoER2 ICD release activates neuronal enhancers governing memory.","evidence":"In vivo ChIP-seq, γ-secretase inhibition, ICD nuclear fractionation, behavior","pmids":["25892301"],"confidence":"High","gaps":["Direct DNA-binding partners of the ICD not all identified","Distinction from CTF repressor role at RELN not reconciled"]},{"year":2015,"claim":"Extended ApoER2-Reelin signaling to peripheral nerve repair, showing the exon-19/proline-rich variant binds PAR3 and activates Rac1 via Tiam1 to drive Schwann cell migration.","evidence":"FRET Rac1 activation, Co-IP, siRNA, migration assay, nerve injury model","pmids":["26386179"],"confidence":"Medium","gaps":["In vivo regeneration outcome not quantified","Single-lab study"]},{"year":2016,"claim":"Provided translational proof that correcting ApoER2 exon-19 splicing improves synaptic function and memory in AD mice and that this splicing is deregulated in AD patient brain.","evidence":"ASO treatment in AD mice, human postmortem splice analysis, electrophysiology, behavior","pmids":["26902204"],"confidence":"Medium","gaps":["Mechanism linking exon-19 loss to AD pathology incompletely defined","Single-lab therapeutic study"]},{"year":2016,"claim":"Showed disease-linked presenilin-1 mutations disrupt ApoER2 processing and surface trafficking, connecting familial AD machinery to receptor biology.","evidence":"PS1 mutant cell lines, CTF immunoblot, surface biotinylation, γ-secretase inhibition","pmids":["27810638"],"confidence":"Medium","gaps":["In vivo consequences of altered ApoER2 processing not tested","Single-lab cell study"]},{"year":2017,"claim":"Defined the activity-dependent control of synaptic ApoER2 by IDOL ubiquitination governing spine remodeling and LTP.","evidence":"IDOL-knockout neurons, spine imaging, LTP, barrel cortex plasticity, behavior","pmids":["28891791"],"confidence":"High","gaps":["Signal that triggers IDOL action on ApoER2 not defined","Crosstalk with PCSK9 pathway not addressed"]},{"year":2017,"claim":"Identified GRIP1-bridged ApoER2-ephrinB2-AMPA receptor complexes required for activity-induced AMPA insertion and LTP.","evidence":"Co-IP, ephrinB2 Ser-9 knock-in mice, AMPA surface insertion, LTP","pmids":["28978486"],"confidence":"High","gaps":["Upstream kinase for ephrinB2 Ser-9 not identified","Relationship to Reelin-Dab1 signaling not delineated"]},{"year":2017,"claim":"Resolved the structural basis of Reelin recognition and pH-triggered release, showing ApoER2 adopts a contracted-open conformation with an auxiliary low-affinity interface destabilized during endocytosis.","evidence":"X-ray crystallography of ectodomain-Reelin fragment complex with mutational and pH-dependent binding analysis","pmids":["28446613"],"confidence":"High","gaps":["Structure of full-length signaling-competent cluster not solved","Conformations with other ligands unknown"]},{"year":2019,"claim":"Explained how ligand form dictates signaling, showing full-length Reelin rearranges pre-formed ApoER2 oligomers into higher-order clusters that trigger Dab1 phosphorylation whereas the central fragment does not.","evidence":"FLIM/FRET and fluorescence anisotropy of tagged receptors in HEK293 cells","pmids":["30873003"],"confidence":"Medium","gaps":["Cluster stoichiometry in neurons not measured","Single-lab biophysical study"]},{"year":2019,"claim":"Linked ApoER2 to cell-cycle control in vascular smooth muscle, showing it is required for PP2A-CDC20 interaction, APC/C activity, and prevention of senescence.","evidence":"Co-IP of ApoER2 with PP2A-C/CDC20, cell-cycle immunoblots, senescence assays, Lrp8-knockout mice","pmids":["31412739"],"confidence":"Medium","gaps":["Mechanism coupling a surface receptor to mitotic APC/C unclear","Single-lab study"]},{"year":2018,"claim":"Resolved the molecular architecture of the pathogenic endothelial PP2A scaffold, showing the apoER2 tail recruits Dab2 (promoting PP2A catalytic-subunit methylation) and SHC1 (recruiting the scaffolding subunit) to dephosphorylate Akt/eNOS and drive thrombosis.","evidence":"Domain-specific mutational Co-IP, PP2A activity, mouse thrombosis, ApoER2-knockout","pmids":["29500169"],"confidence":"High","gaps":["How antibody engagement initiates assembly structurally undefined","Therapeutic targetability not tested"]},{"year":2021,"claim":"Extended the apoER2-PP2A pathomechanism to pregnancy, implicating trophoblast apoER2-PP2A signaling in antiphospholipid-driven preeclampsia.","evidence":"Mouse antiphospholipid syndrome model, trophoblast genetics, PP2A activity, preeclampsia readouts","pmids":["34404233"],"confidence":"Medium","gaps":["Trophoblast-specific receptor partners not fully mapped","Single-lab in vivo study"]},{"year":2021,"claim":"Revealed an unexpected role as a viral entry receptor, showing alphavirus E2-E1 glycoproteins engage ApoER2/VLDLR ligand-binding domains to mediate infection.","evidence":"Ectopic expression entry assays, VLP internalization, LBD-Fc blocking, mouse challenge","pmids":["34929721"],"confidence":"High","gaps":["Relative ApoER2 vs VLDLR contribution in vivo not separated","Tissue tropism determinants unclear"]},{"year":2022,"claim":"Showed human APOER2 isoform diversity tunes CTF/ICD generation and synaptic function, with specific repeat deletions altering transmission via Mint1-mediated ICD release.","evidence":"Sequencing of 25 human isoforms, CTF immunoblot, ICD fractionation, Mint1 assay, knockout-rescue, mEPSC recordings","pmids":["35414534"],"confidence":"Medium","gaps":["In vivo prevalence of disease-relevant isoforms unknown","Single-lab study"]},{"year":2023,"claim":"Established a high-affinity O-glycosylated ApoER2 variant mediating selenocysteine-lyase-independent selenium transport, refining how isoforms determine selenium handling.","evidence":"Variant characterization, SeP binding affinity, siRNA, 75Se uptake, Sec lyase and acidification inhibition","pmids":["37406814"],"confidence":"Medium","gaps":["Physiological tissues using this pathway not defined","Single-lab study"]},{"year":2023,"claim":"Identified ApoER2 as a ferroptosis-resistance determinant in cancer, showing LRP8-mediated SELENOP uptake supplies selenocysteine for GPX4 translation in MYCN-amplified neuroblastoma.","evidence":"CRISPR activation screen, constitutive/inducible LRP8 knockout in xenografts, ferroptosis and GPX4 assays","pmids":["37435859"],"confidence":"High","gaps":["Generalizability beyond low-system-Xc- cancers limited","Targetability for therapy not tested"]},{"year":2025,"claim":"Identified ApoER2 as a receptor for tick-borne encephalitis virus, showing direct E-glycoprotein binding mediates attachment/internalization and a soluble decoy protects mice.","evidence":"Genome-scale CRISPR screen, overexpression/knockdown, direct binding, decoy in cells and mouse challenge","pmids":["40993380"],"confidence":"High","gaps":["Contribution to neurotropism in vivo not dissected","Receptor usage relative to other flavivirus receptors unknown"]},{"year":null,"claim":"How a single receptor coordinates its mutually exclusive roles — Reelin signaling, broad-ligand transduction, selenium transport, viral entry, and cytoplasmic PP2A/cell-cycle scaffolding — through isoform choice, glycosylation, microdomain sorting, and ubiquitin/protease control remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of how isoform/glycosylation states partition signaling vs transport functions","Structures of full-length signaling clusters and ligand-specific conformations lacking","Direct nuclear partners of the ICD/CTF incompletely identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[37,40]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[4,27,38,43]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,8,20,6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,13,19,24]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[30,11]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[18,22]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,13,30]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[19,44,14]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[3,14,27]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,22,42]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8,17,36]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,17,35]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,18,31,32]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[10,15,16,24]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[4,27,38,43]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[13,19,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,38]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,9,18,22]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[37,40,45,10]}],"complexes":["ApoER2-NMDA receptor postsynaptic complex","apoER2-Dab2-SHC1-PP2A endothelial complex","ApoER2-ephrinB2-AMPA receptor (GRIP1) complex","APC/C-CDC20 (PP2A) mitotic complex"],"partners":["DAB1","DAB2","RELN","PCSK9","MYLIP","SELENOP","SNX17","APP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14114","full_name":"Low-density lipoprotein receptor-related protein 8","aliases":["Apolipoprotein E receptor 2"],"length_aa":963,"mass_kda":105.6,"function":"Cell surface receptor for Reelin (RELN) and apolipoprotein E (apoE)-containing ligands (PubMed:12899622, PubMed:12950167, PubMed:20223215, PubMed:30873003). LRP8 participates in transmitting the extracellular Reelin signal to intracellular signaling processes, by binding to DAB1 on its cytoplasmic tail (By similarity). Reelin acts via both the VLDL receptor (VLDLR) and LRP8 to regulate DAB1 tyrosine phosphorylation and microtubule function in neurons (By similarity). LRP8 has higher affinity for Reelin than VLDLR (By similarity). LRP8 is thus a key component of the Reelin pathway which governs neuronal layering of the forebrain during embryonic brain development (By similarity). Binds the endoplasmic reticulum resident receptor-associated protein (RAP) (By similarity). Binds dimers of beta 2-glycoprotein I and may be involved in the suppression of platelet aggregation in the vasculature (PubMed:12807892). Highly expressed in the initial segment of the epididymis, where it affects the functional expression of clusterin and phospholipid hydroperoxide glutathione peroxidase (PHGPx), two proteins required for sperm maturation (By similarity). May also function as an endocytic receptor (By similarity). Not required for endocytic uptake of SEPP1 in the kidney which is mediated by LRP2 (By similarity). Together with its ligand, apolipoprotein E (apoE), may indirectly play a role in the suppression of the innate immune response by controlling the survival of myeloid-derived suppressor cells (By similarity) (Microbial infection) Acts as a receptor for Semliki Forest virus (Microbial infection) Acts as a receptor for tick-borne encephalitis virus by mediating viral cell attachment and internalization","subcellular_location":"Cell membrane; Secreted","url":"https://www.uniprot.org/uniprotkb/Q14114/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LRP8","classification":"Not Classified","n_dependent_lines":80,"n_total_lines":1208,"dependency_fraction":0.06622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LRP8","total_profiled":1310},"omim":[{"mim_id":"608446","title":"MYOCARDIAL 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research","url":"https://pubmed.ncbi.nlm.nih.gov/34404233","citation_count":17,"is_preprint":false},{"pmid":"22683052","id":"PMC_22683052","title":"SeP, ApoER2 and megalin as necessary factors to maintain Se homeostasis in mammals.","date":"2012","source":"Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS)","url":"https://pubmed.ncbi.nlm.nih.gov/22683052","citation_count":16,"is_preprint":false},{"pmid":"28386352","id":"PMC_28386352","title":"Clusterin signals via ApoER2/VLDLR and induces meiosis of male germ cells.","date":"2017","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/28386352","citation_count":16,"is_preprint":false},{"pmid":"15582748","id":"PMC_15582748","title":"The apoE receptor apoER2 is involved in the maintenance of efficient synaptic plasticity.","date":"2005","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/15582748","citation_count":16,"is_preprint":false},{"pmid":"38609049","id":"PMC_38609049","title":"Enhanced LRP8 expression induced by Helicobacter pylori drives gastric cancer progression by facilitating β-Catenin nuclear translocation.","date":"2024","source":"Journal of advanced research","url":"https://pubmed.ncbi.nlm.nih.gov/38609049","citation_count":15,"is_preprint":false},{"pmid":"31165485","id":"PMC_31165485","title":"miR-409-5p negatively regulates Wnt/Beta catenin signaling pathway by targeting Lrp-8.","date":"2019","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/31165485","citation_count":15,"is_preprint":false},{"pmid":"30873003","id":"PMC_30873003","title":"Differential Action of Reelin on Oligomerization of ApoER2 and VLDL Receptor in HEK293 Cells Assessed by Time-Resolved Anisotropy and Fluorescence Lifetime Imaging Microscopy.","date":"2019","source":"Frontiers in molecular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/30873003","citation_count":15,"is_preprint":false},{"pmid":"28495490","id":"PMC_28495490","title":"Further evidence for the association between LRP8 and schizophrenia.","date":"2017","source":"Schizophrenia research","url":"https://pubmed.ncbi.nlm.nih.gov/28495490","citation_count":14,"is_preprint":false},{"pmid":"33054597","id":"PMC_33054597","title":"LRP8 activates STAT3 to induce PD-L1 expression in osteosarcoma.","date":"2020","source":"Tumori","url":"https://pubmed.ncbi.nlm.nih.gov/33054597","citation_count":14,"is_preprint":false},{"pmid":"34839107","id":"PMC_34839107","title":"miR-362-3p suppresses ovarian cancer by inhibiting LRP8.","date":"2021","source":"Translational oncology","url":"https://pubmed.ncbi.nlm.nih.gov/34839107","citation_count":14,"is_preprint":false},{"pmid":"30649678","id":"PMC_30649678","title":"Effect of Aluminum-Maltolate on the Content of Aβ Protein and the Expression of ApoER2, VLDLRs, and LRP1 in PC12-ApoE4 Cells.","date":"2019","source":"Neurotoxicity research","url":"https://pubmed.ncbi.nlm.nih.gov/30649678","citation_count":14,"is_preprint":false},{"pmid":"23524007","id":"PMC_23524007","title":"Multi-allelic haplotype association identifies novel information different from single-SNP analysis: a new protective haplotype in the LRP8 gene is against familial and early-onset CAD and MI.","date":"2013","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/23524007","citation_count":14,"is_preprint":false},{"pmid":"17907841","id":"PMC_17907841","title":"Altered performance of reelin-receptor ApoER2 deficient mice on spatial tasks using the Barnes maze.","date":"2007","source":"Behavioral neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/17907841","citation_count":13,"is_preprint":false},{"pmid":"31796678","id":"PMC_31796678","title":"Carnosic Acid Reverses the Inhibition of ApoE4 on Cell Surface Level of ApoER2 and Reelin Signaling Pathway.","date":"2020","source":"Journal of Alzheimer's disease : JAD","url":"https://pubmed.ncbi.nlm.nih.gov/31796678","citation_count":12,"is_preprint":false},{"pmid":"33840662","id":"PMC_33840662","title":"Coix lacryma-jobi Seed Oil Reduces Fat Accumulation in Nonalcoholic Fatty Liver Disease by Inhibiting the Activation of the p-AMPK/SePP1/apoER2 Pathway.","date":"2021","source":"Journal of oleo science","url":"https://pubmed.ncbi.nlm.nih.gov/33840662","citation_count":12,"is_preprint":false},{"pmid":"35414534","id":"PMC_35414534","title":"Human APOER2 Isoforms Have Differential Cleavage Events and Synaptic Properties.","date":"2022","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/35414534","citation_count":11,"is_preprint":false},{"pmid":"22404453","id":"PMC_22404453","title":"Genetic variant R952Q in LRP8 is associated with increased plasma triglyceride levels in patients with early-onset CAD and MI.","date":"2012","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22404453","citation_count":11,"is_preprint":false},{"pmid":"35192893","id":"PMC_35192893","title":"Single molecule, long-read Apoer2 sequencing identifies conserved and species-specific splicing patterns.","date":"2022","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/35192893","citation_count":10,"is_preprint":false},{"pmid":"25233900","id":"PMC_25233900","title":"Neurotrophins regulate ApoER2 proteolysis through activation of the Trk signaling pathway.","date":"2014","source":"BMC neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/25233900","citation_count":10,"is_preprint":false},{"pmid":"23506116","id":"PMC_23506116","title":"Dab1-mediated colocalization of multi-adaptor protein CIN85 with Reelin receptors, ApoER2 and VLDLR, in neurons.","date":"2013","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/23506116","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50607,"output_tokens":12222,"usd":0.167575,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":23677,"output_tokens":10878,"usd":0.195167,"stage2_stop_reason":"end_turn"},"total_usd":0.362742,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"ApoER2 is present in postsynaptic densities of excitatory synapses where it forms a functional complex with NMDA receptors. Reelin signaling through ApoER2 enhances LTP through a mechanism requiring amino acids encoded by an alternatively spliced exon (exon 19) in the intracellular domain, which is required for Reelin-induced tyrosine phosphorylation of NMDA receptor subunits.\",\n      \"method\": \"Co-immunoprecipitation, postsynaptic density fractionation, alternative splicing analysis, LTP electrophysiology, behavioral learning/memory tasks in knock-in mice\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, biochemical fractionation, electrophysiology, and in vivo behavioral rescue with multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"16102539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ApoER2, but not VLDLR, binds JNK-interacting proteins (JIP-1 and JIP-2), which act as molecular scaffolds for the JNK signaling pathway. The ApoER2 binding domain on JIP-2 does not overlap with binding sites for MLK3, MKK7, and JNK, allowing ApoER2 to assemble a multiprotein complex containing Disabled-1 and JIPs at the neuronal cell surface.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and domain mapping, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"10827199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Purified Reelin binds directly to ApoER2 and VLDLR to induce tyrosine phosphorylation of Disabled-1 (Dab1). ApoER2 shows greater Reelin-binding affinity than VLDLR. Complete absence of both receptors abolishes Reelin-induced Dab1 phosphorylation in cortical neurons.\",\n      \"method\": \"Purified Reelin binding assay, Dab1 phosphorylation immunoblot, genetic knockout mice, cortical neuron cultures\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding with purified proteins, genetic null validation, replicated across receptor genotypes\",\n      \"pmids\": [\"12670700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PCSK9 induces degradation of ApoER2 (as well as LDLR and VLDLR) either via cellular co-expression or re-internalization of secreted PCSK9. This degradation does not require PCSK9 catalytic activity and is directed to late endosomes/lysosomes. Membrane-bound PCSK9 chimeras are more efficient at degrading ApoER2 than secreted PCSK9.\",\n      \"method\": \"Cell co-expression, secreted protein re-internalization, lysosomal targeting assays, catalytically inactive mutant PCSK9, immunoblotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro gain/loss of function, active-site mutagenesis, multiple experimental conditions in one rigorous study\",\n      \"pmids\": [\"18039658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ApoER2 mediates selenium uptake from selenoprotein P (Sepp1) in the mouse testis. Sertoli cells express ApoER2 as the Sepp1 receptor; apoER2-deficient males show sharply reduced testis selenium and identical sperm defects to Sepp1-deficient males. Co-immunoprecipitation confirmed ApoER2-Sepp1 interaction.\",\n      \"method\": \"Sepp1 affinity chromatography, mass spectrometry, co-immunoprecipitation, ApoER2 knockout mice, in situ hybridization, immunocytochemistry, selenium measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — affinity chromatography with MS identification, co-IP, genetic knockout validation, multiple orthogonal methods\",\n      \"pmids\": [\"17314095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ApoER2 and Dab1 are required for postnatal chain migration of neuronal precursors from the subventricular zone to the olfactory bulb in a Reelin-independent manner. Mice lacking both ApoER2 and VLDLR, or Dab1, showed severely compromised chain formation and virtual absence of the rostral migratory stream.\",\n      \"method\": \"Genetic knockout mice, organotypic migration assay, immunohistochemistry, neuroanatomical analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with defined phenotypic readout, replicated across multiple genotypes\",\n      \"pmids\": [\"17494763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Thrombospondin-1 (THBS-1) is a novel physiological ligand for ApoER2 and VLDLR. THBS-1 binds ApoER2 and VLDLR and induces phosphorylation of Dab1 but, unlike Reelin, does not induce Dab1 degradation or Akt phosphorylation. THBS-1 stabilizes neuronal precursor chains in the rostral migratory stream.\",\n      \"method\": \"Ligand binding assay, Dab1 phosphorylation immunoblot, THBS-1 knockout mice, subventricular zone explant cultures\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding assay, signaling assays with genetic null validation, orthogonal methods in single study\",\n      \"pmids\": [\"18946489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"F-spondin interacts with ApoER2 through its thrombospondin domain binding to the ApoER2 ligand-binding domain. Full-length F-spondin increases ApoER2-APP co-immunoprecipitation, increases surface expression of both, promotes cleavage of APP and ApoER2, and decreases Aβ production in a RAP-inhibitable manner.\",\n      \"method\": \"Co-immunoprecipitation, surface biotinylation, RAP-inhibition assay, cell transfection, primary neuron cultures\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, functional assays with pharmacological inhibition, single lab with multiple methods\",\n      \"pmids\": [\"16227578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Activated protein C (APC) binds directly and with high affinity (Kd ~30 nM) to ApoER2 (but not VLDLR) via a surface plasmon resonance-measured interaction. APC ligation of ApoER2 induces rapid phosphorylation of Dab1 Tyr-220 and Akt Ser-473, with downstream GSK3β Ser-9 phosphorylation via PI3K. siRNA knockdown of ApoER2 abolishes APC-induced Dab1 phosphorylation.\",\n      \"method\": \"Surface plasmon resonance, siRNA knockdown, phospho-specific immunoblotting, PI3K inhibitor, RAP blocking\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — SPR binding measurement, siRNA knockdown, pharmacological pathway inhibition with multiple orthogonal methods\",\n      \"pmids\": [\"19116273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The E3 ubiquitin ligase IDOL induces ubiquitination of ApoER2 and VLDLR on their cytoplasmic tails, leading to their degradation. LXR activation increases IDOL expression and decreases VLDLR levels in vivo. LXR activation reduces Reelin binding to VLDLR and Dab1 phosphorylation, functionally linking LXR and Reelin signaling.\",\n      \"method\": \"Ubiquitination assay, cell overexpression, siRNA knockdown, pharmacological LXR activation in mice, Dab1 phosphorylation immunoblot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct ubiquitination assay, in vivo mouse pharmacology, functional downstream signaling readouts in single study\",\n      \"pmids\": [\"20427281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Antiphospholipid antibodies (aPL) promote leukocyte-endothelial adhesion and thrombosis through ApoER2-dependent antagonism of eNOS. The mechanism involves β2GPI dimerization leading to attenuated eNOS Ser1179 phosphorylation via protein phosphatase 2A. ApoER2-/- mice are protected from aPL inhibition of eNOS, leukocyte adhesion, and thrombus formation in vivo.\",\n      \"method\": \"ApoER2 knockout mice, in vivo carotid conductance assay, eNOS phosphorylation immunoblot, PP2A activity assay, monocyte adhesion assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with multiple in vivo and in vitro phenotypic readouts, mechanism defined through PP2A\",\n      \"pmids\": [\"21123944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ApoER2 (LRP8) on endothelial cells serves as the receptor for cancer-secreted ApoE to suppress metastatic endothelial recruitment (MER) and angiogenesis. ApoE engagement of endothelial LRP8 (not LRP1) suppresses angiogenesis, and miRNAs that suppress ApoE promote metastasis via this pathway.\",\n      \"method\": \"In vivo selection, siRNA knockdown, locked nucleic acid miRNA inhibition, endothelial recruitment assays, xenograft metastasis models\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown with defined phenotype, in vivo models, single lab\",\n      \"pmids\": [\"23142051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PCSK9 potentiates neuronal apoptosis by reducing ApoER2 protein levels. RNAi-mediated knockdown of PCSK9 increases ApoER2 levels and reduces neuronal apoptosis; knockdown of ApoER2 (but not VLDLR) reverses this protection. PCSK9 regulates neuronal apoptosis via ApoER2-associated ERK and JNK signaling independently of NMDA receptor function.\",\n      \"method\": \"RNAi knockdown, apoptosis assays (caspase-3, p-c-Jun), pharmacological signaling pathway inhibition, cerebellar granule neuron culture\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown with defined apoptotic phenotype, receptor-specific rescue, single lab\",\n      \"pmids\": [\"22481440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ApoER2 undergoes endocytosis via a clathrin-mediated pathway dependent on its cytoplasmic FxNPXY motif, which mediates binding to the adaptor protein Dab2. Dominant-negative eps15 and Dab2 decrease ApoER2 internalization. Lipid raft association of ApoER2 does not determine its endocytic pathway.\",\n      \"method\": \"Dominant-negative expression, nystatin treatment, clathrin inhibition, receptor internalization assay, co-immunoprecipitation with Dab2\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative constructs, pharmacological inhibition, Co-IP, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"16101684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ApoER2 and VLDLR have divergent receptor fates upon Reelin stimulation linked to their differential sorting to raft vs. non-raft membrane domains. VLDLR (non-raft) endocytoses and degrades Reelin via clathrin/endosome pathway without receptor degradation. ApoER2 (raft-resident) generates specific receptor fragments and is degraded via lysosomes, contributing to negative feedback loops.\",\n      \"method\": \"Chimeric receptor constructs, lipid raft fractionation, Reelin endocytosis assay, lysosomal degradation assay, immunoblotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chimeric receptor domain-swap approach, raft fractionation, functional assays, single lab\",\n      \"pmids\": [\"19948739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Coagulation factor XI (FXI) is a ligand for platelet ApoER2. Platelet adhesion to FXI is abrogated by soluble recombinant ApoER2, RAP, or LDL-binding domain 1 or 2 of ApoER2. ApoER2-deficient murine platelets fail to adhere to FXI. Soluble FXI binds immobilized ApoER2 with an affinity of 61 nM.\",\n      \"method\": \"Platelet adhesion assay, ApoER2-deficient mice, surface plasmon resonance binding measurement, RAP inhibition, recombinant domain deletion mutants\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative binding measurement, genetic null validation, domain deletion analysis, multiple orthogonal methods\",\n      \"pmids\": [\"19661487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"β2-Glycoprotein I (β2GPI) binds platelet ApoER2 via domain V of dimeric β2GPI. Domain V deletion mutants lacking the phospholipid-insertion loop fail to bind ApoER2 or increase platelet adhesion to collagen, while domain I and II deletion mutants retain ApoER2 binding.\",\n      \"method\": \"Domain deletion mutants of β2GPI, immunoprecipitation, platelet adhesion assay in whole blood\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion mapping with functional readout, Co-IP, single lab\",\n      \"pmids\": [\"16091370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ApoER2 (LRP8) mediates Wnt/β-catenin signaling and controls osteoblast differentiation. LRP8 knockdown decreases β-catenin levels and suppresses Wnt-induced Axin2 transcription and osteoblast mineralization; LRP8 ectopic expression promotes Wnt-induced β-catenin accumulation and osteoblast differentiation.\",\n      \"method\": \"siRNA knockdown, ectopic overexpression, Wnt reporter assay, immunoblotting for β-catenin, osteoblast differentiation assay, KS483 osteoprogenitor cells\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and overexpression with functional differentiation readout, multiple methods, single lab\",\n      \"pmids\": [\"22589174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Reelin binding to LRP8 triggers activation of a cohort of neuronal enhancers (LRN enhancers) via a synapse-to-nucleus pathway. This requires γ-secretase-dependent cleavage of LRP8 releasing its intracellular domain (ICD), which regulates synaptically generated signals. LRP8 ICD participates in transcriptional regulation of synaptic plasticity genes underlying memory formation.\",\n      \"method\": \"In vivo ChIP-seq enhancer mapping, γ-secretase inhibition, LRP8 ICD nuclear fractionation, mouse learning/memory behavioral assays, NMDA-receptor signaling assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo ChIP-seq, γ-secretase mutagenesis/inhibition, nuclear fractionation, behavioral phenotyping with multiple orthogonal methods\",\n      \"pmids\": [\"25892301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Sorting nexin 17 (SNX17) interacts with the NPxY endocytosis motif of ApoER2 via its FERM domain and stimulates ApoER2 recycling from early to recycling endosomes without affecting endocytic rate. SNX17 knockdown increases Reelin-induced ApoER2 degradation and reduces dendritic tree development and Reelin signaling in hippocampal neurons.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, ApoER2 recycling assay, siRNA knockdown, neuronal culture morphology, Dab1 phosphorylation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pull-down domain mapping, Co-IP, functional trafficking assays, neuronal phenotype, single lab\",\n      \"pmids\": [\"24705369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Clusterin binds directly to ApoER2 and VLDLR and is internalized by cells expressing either receptor. Clusterin binding triggers a Reelin-like signal, inducing Dab1 phosphorylation and PI3K/Akt and n-cofilin activation. Blocking clusterin in SVZ explants compromises cell proliferation and neuroblast chain formation.\",\n      \"method\": \"Ligand binding/internalization assay, Dab1 phosphorylation immunoblot, PI3K/Akt immunoblot, SVZ explant culture, clusterin blocking antibody\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding and internalization, signaling assays, functional SVZ assay, single lab\",\n      \"pmids\": [\"24381170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Apoer2 lacking exon 16 (O-linked sugar domain) shows reduced extracellular cleavage and consequently impaired γ-secretase-dependent release of the ApoER2 intracellular domain. Mice expressing this variant show increased ApoER2 abundance, altered hippocampal spine density, glutamate receptor abundance, and synaptic efficacy.\",\n      \"method\": \"Knock-in mice, proteolytic cleavage assay, spine density quantification, glutamate receptor immunoblot, hippocampal LTP electrophysiology, behavioral tests\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo knock-in model, proteolytic processing assay, electrophysiology, and behavioral phenotyping with multiple orthogonal methods\",\n      \"pmids\": [\"25429077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Presenilin 1 (PS1)/γ-secretase processes ApoER2 to generate an intracellular C-terminal fragment (CTF). The ApoER2 CTF binds to the RELN promoter region and suppresses reelin transcription at the transcriptional level. PS1 conditional knockout mice show increased ApoER2 and reelin protein levels.\",\n      \"method\": \"PS1 conditional knockout mice, luciferase reporter assay, nuclear fractionation, chromatin immunoprecipitation (ChIP), pharmacological γ-secretase inhibition\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP demonstrating CTF-promoter binding, in vivo PS1 KO, reporter assay, nuclear fractionation, multiple orthogonal methods\",\n      \"pmids\": [\"24344333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ApoER2 ectodomain adopts an intermediate contracted-open conformation when complexed with the signaling-competent Reelin fragment at neutral pH, different from LDLR. Crystallographic analysis identifies an auxiliary low-affinity binding interface; pH shift during endocytosis weakens this auxiliary interface and destabilizes the ligand-receptor complex, priming ligand release prior to internalization.\",\n      \"method\": \"X-ray crystallography of full-length ApoER2 ectodomain-Reelin fragment complex, mutational analysis, pH-dependent binding assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure determination with mutational validation, defines mechanism at atomic resolution\",\n      \"pmids\": [\"28446613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The apoER2 cytoplasmic tail serves as a scaffold for aPL-induced assembly and activation of heterotrimeric PP2A in endothelial cells. Dab2 recruitment to the apoER2 NPXY motif promotes activating L309 methylation of the PP2A catalytic subunit by leucine methyl transferase-1. SHC1 recruits PP2A scaffolding subunit to the proline-rich apoER2 C-terminus, mediating inhibitory dephosphorylation of Akt and eNOS. This apoER2-Dab2-SHC1 complex underlies aPL-invoked thrombosis in mice.\",\n      \"method\": \"Co-immunoprecipitation, endothelial cell PP2A activity assay, site-specific mutational analysis of apoER2 domains, mouse thrombosis model, apoER2 knockout mice\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with domain-specific mapping, PP2A activity, in vivo KO validation, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"29500169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ApoER2 participates in APC (anaphase-promoting complex)/CDC20 complex formation during mitosis. In apoER2-deficient smooth muscle cells, PP2A-C fails to interact with CDC20, resulting in inactive APC and impaired cytokinesis abscission, leading to cell cycle arrest at metaphase/anaphase and premature cell senescence.\",\n      \"method\": \"Co-immunoprecipitation of apoER2 with PP2A catalytic subunit and CDC20, cell cycle protein immunoblotting, β-galactosidase senescence assay, p16INK4a immunofluorescence, Lrp8 knockout mice\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction, genetic null with defined senescence phenotype, cell cycle protein analysis, single lab\",\n      \"pmids\": [\"31412739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The signaling motifs in the Apoer2 cytoplasmic domain are functionally dissociable from Sepp1 (selenoprotein P) uptake. Knock-in mice with signaling-impaired Apoer2 cytoplasmic domain mutations have normal brain and testis selenium concentrations, demonstrating that neurological defects in these mice result from disrupted Reelin signaling, not impaired selenium uptake.\",\n      \"method\": \"Knock-in mice with cytoplasmic domain mutations, selenium concentration measurement in tissues, neurological phenotyping, sperm motility analysis\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genetic knock-in domain-swap dissociation with quantitative biochemical readouts in multiple tissues\",\n      \"pmids\": [\"19007311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Long isoform selenoprotein P (Sepp1) is taken up by L8 myoblast cells via an apoER2-mediated mechanism requiring binding to heparin sulfate proteoglycans. siRNA knockdown of apoER2 (but not Lrp1) inhibits 75Se uptake from Sepp1. Lysosomal acidification is required for Sepp1 digestion and selenium utilization but not for Sepp1 uptake itself.\",\n      \"method\": \"siRNA knockdown, 75Se radiolabeled uptake assay, affinity chromatography with mass spectrometry, protamine/chlorate treatment, lysosomal acidification inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — receptor-specific siRNA KD with isotopic selenium uptake quantification, affinity chromatography with MS identification\",\n      \"pmids\": [\"22761431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FE65 interacts with ApoER2 via its N-terminal PTB domain, acting as an intracellular bridge between ApoER2 and APP. Full-length FE65 increases surface expression of ApoER2, increases secreted APP and ApoER2 forms, and decreases Aβ production. Both PTB domains of FE65 must be present simultaneously for effects on APP/ApoER2 processing.\",\n      \"method\": \"Co-immunoprecipitation, surface protein biotinylation, live cell staining, COS7 cell transfection, Aβ ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP domain mapping, surface biotinylation, functional processing assay, single lab\",\n      \"pmids\": [\"16638748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ApoER2 expression increases APP association with lipid rafts, promotes gamma-secretase activity, and increases Aβ production while decreasing APP internalization. The increased Aβ production is dependent on the integrity of the NPxY endocytosis motif of ApoER2. ApoER2 physically interacts and co-localizes with APP.\",\n      \"method\": \"Co-immunoprecipitation, APP internalization rate assay, lipid raft fractionation, gamma-secretase activity assay, Aβ ELISA, NPxY motif mutagenesis\",\n      \"journal\": \"Molecular neurodegeneration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, lipid raft fractionation, NPxY mutagenesis with functional readout, multiple methods, single lab\",\n      \"pmids\": [\"17620134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ApoE3 binding to ApoER2 stimulates eNOS, promotes endothelial cell migration, and attenuates monocyte-endothelial adhesion in endothelial cells. ApoE4 does not stimulate eNOS or migration and selectively antagonizes ApoE3/ApoER2 actions, requiring the N-terminal to C-terminal interaction that distinguishes ApoE4 from ApoE3. The LRP8 R952Q variant is a loss-of-function variant of ApoER2 in endothelium; ApoER2-/- mice show decreased carotid reendothelialization and exaggerated neointima formation.\",\n      \"method\": \"eNOS activity assay, endothelial cell migration assay, monocyte adhesion assay, ApoER2 knockout mouse carotid reendothelialization, neointima formation model, adenoviral apoE expression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO mouse models, functional endothelial assays, reconstitution experiments, multiple orthogonal methods replicated in vivo\",\n      \"pmids\": [\"25197062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The E3 ubiquitin ligase IDOL determines synaptic ApoER2 protein levels in response to neuronal activation and regulates dendritic spine morphogenesis. IDOL-dependent ApoER2 ubiquitination modulates filopodia initiation and synapse maturation. IDOL knockout in neurons causes ApoER2 overexpression, impaired activity-dependent spine remodeling, and defective LTP.\",\n      \"method\": \"IDOL knockout neurons, ApoER2 protein level immunoblot, dendritic spine imaging, hippocampal LTP electrophysiology, experience-dependent barrel cortex plasticity assay, learning/memory behavioral tests\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple orthogonal readouts including electrophysiology, structural plasticity, and in vivo behavioral tests\",\n      \"pmids\": [\"28891791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GRIP1 binds ApoER2 and bridges a complex including ApoER2, ephrinB2, and AMPA receptors at the postsynapse. Neuronal activity induces ApoER2-ephrinB2 association; phosphorylation of ephrinB2 Ser-9 is essential for complex stability. In vivo mutation of ephrinB2 Ser-9 disrupts the complex, eliminates ApoER2 downstream signaling, and impairs activity-induced AMPA receptor insertion and LTP.\",\n      \"method\": \"Co-immunoprecipitation, knock-in ephrinB2 Ser-9 mutant mice, AMPA receptor surface insertion assay, hippocampal LTP electrophysiology, compound genetics\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, in vivo knock-in validation, electrophysiology, and receptor trafficking assays with compound genetics\",\n      \"pmids\": [\"28978486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Antisense oligonucleotide (ASO)-mediated correction of ApoER2 exon 19 splicing in Alzheimer's disease mice improves synaptic function and learning/memory. The balance of ApoER2 exon 19 splicing is deregulated in AD patient postmortem brain tissue. Exon 19 is required for ApoER2 signaling.\",\n      \"method\": \"ASO treatment in AD transgenic mice, splice variant analysis in human postmortem brain, synaptic function electrophysiology, Morris water maze behavioral testing\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — therapeutic ASO with defined splicing correction and functional behavioral rescue, translational human tissue validation, single lab\",\n      \"pmids\": [\"26902204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Presenilin-1 (PS1) mutations alter ApoER2 processing and trafficking. PS1 mutation R278I impairs γ-secretase cleavage of ApoER2 at baseline and after Reelin treatment. PS1 L282V mutation reduces cell-surface levels of ApoER2 without affecting total levels, indicating a trafficking defect. PS1 M146V permits accumulation of ApoER2 CTFs after Reelin treatment.\",\n      \"method\": \"PS1 mutant cell lines, ApoER2 CTF immunoblot, cell-surface protein biotinylation, γ-secretase inhibitor treatment, Reelin stimulation\",\n      \"journal\": \"Neurobiology of aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific PS1 mutants with surface biotinylation and cleavage assays, single lab\",\n      \"pmids\": [\"27810638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ApoER2 and Reelin are expressed in regenerating peripheral nerves and regulate Schwann cell migration. Reelin activates Rac1 at the leading edge of Schwann cells (detected by FRET). ApoER2 exon-19-containing splice variant (with proline-rich insert) binds PAR3. Tiam1, a Rac1-specific GEF, is required for Reelin-induced Schwann cell migration, and PAR3 associates with Tiam1 and ApoER2.\",\n      \"method\": \"FRET experiments for Rac1 activation, co-immunoprecipitation of ApoER2-PAR3, siRNA knockdown of Tiam1/PAR3/ApoER2, Schwann cell migration assay, peripheral nerve injury model\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET, Co-IP, siRNA with functional migration readout, single lab with multiple methods\",\n      \"pmids\": [\"26386179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ApoER2 homo- and hetero-oligomers are formed in the absence of Reelin. Full-length Reelin binding rearranges ApoER2 homo-oligomers into higher-order receptor clusters, which leads to Dab1 phosphorylation. Binding of the central Reelin fragment does not increase cluster size and does not induce Dab1 phosphorylation, but can induce ApoER2 hetero-oligomerization with VLDLR without triggering the canonical signal.\",\n      \"method\": \"Time-resolved fluorescence anisotropy, fluorescence lifetime imaging microscopy (FLIM), FRET, HEK293 cells expressing tagged receptors\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FLIM/FRET structural analysis, single lab with quantitative biophysical readout\",\n      \"pmids\": [\"30873003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VLDLR and ApoER2 (LRP8) are functional entry receptors for multiple alphaviruses including Semliki forest virus, eastern equine encephalitis virus, and Sindbis virus. The alphavirus E2-E1 glycoproteins interact with the ligand-binding domains of VLDLR and ApoER2. VLDLR LBD-Fc fusion protein blocks virus infection in cell culture and protects mice from lethal challenge.\",\n      \"method\": \"Ectopic receptor expression facilitating viral entry, virus-like particle internalization assay, LBD-Fc blocking experiments, mouse lethal challenge model\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted entry assay with ectopic expression, domain-specific blocking, in vivo mouse protection, multiple orthogonal methods\",\n      \"pmids\": [\"34929721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LRP8 is a key determinant protecting MYCN-amplified neuroblastoma cells from ferroptosis by mediating selenoprotein P (SELENOP) uptake to supply selenocysteine required for GPX4 translation. Genetic deletion of LRP8 causes ferroptosis due to insufficient selenocysteine supply; this dependency is specific to cells with low expression of alternative selenium uptake pathways (system Xc-).\",\n      \"method\": \"CRISPR activation screen, LRP8 knockout (constitutive and inducible) in orthotopic xenografts, ferroptosis assays, GPX4 immunoblot, selenium uptake assay\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-scale CRISPR screen, genetic KO with in vivo xenograft validation and mechanistic pathway confirmation, multiple methods\",\n      \"pmids\": [\"37435859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Splice variants of ApoER2 with different numbers of ligand-binding type A (LA) repeats (LA1237 vs. LA12378) differ in Reelin-binding affinity. LA8 and Reelin repeat 8 (RR8) interfere with the interaction between the central Reelin fragment and ApoER2. Proteolytic cleavage of Reelin and alternative splicing of ApoER2 contribute to fine regulation of Reelin signaling.\",\n      \"method\": \"Quantitative binding assay between Reelin isoforms/fragments and ApoER2 splice variants, monoclonal antibody specificity, primary cortical neuron signaling assays\",\n      \"journal\": \"Neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct quantitative binding assays with purified protein variants, domain-level analysis, single lab\",\n      \"pmids\": [\"19167437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LRP8 is a receptor for tick-borne encephalitis virus (TBEV). LRP8 downregulation reduces TBEV infection in human cells and overexpression enhances it. LRP8 binds directly to the TBEV E glycoprotein and mediates viral attachment and internalization. An LRP8-based soluble decoy blocked TBEV infection in human cell lines and neuronal cells and protected mice from lethal challenge.\",\n      \"method\": \"Genome-scale CRISPR-Cas9 screen, LRP8 overexpression/knockdown, direct LRP8-E glycoprotein binding assay, viral attachment/internalization assay, LRP8 soluble decoy in cell culture and mouse lethal challenge\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — CRISPR screen identification validated by overexpression/knockdown, direct protein binding, and in vivo mouse protection with soluble decoy\",\n      \"pmids\": [\"40993380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NGF-induced TrkA activation in PC12 cells induces ApoER2 proteolytic processing via metalloproteinase activity, independently of MAPK and PI3K. In primary cortical neurons, BDNF (TrkB ligand) also regulates ApoER2 proteolysis. Reelin regulates proteolysis of its own receptor ApoER2 but does not affect p75NTR processing.\",\n      \"method\": \"TrkA/TrkB activation in cell lines and primary neurons, metalloproteinase inhibitors, MAPK/PI3K pharmacological inhibition, ApoER2 shedding/CTF immunoblot\",\n      \"journal\": \"BMC neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with defined processing readout, neurotrophin-specific receptor cross-regulation, single lab\",\n      \"pmids\": [\"25233900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human APOER2 isoforms lacking different numbers of ligand-binding repeats generate differential amounts of C-terminal fragments (CTFs) in response to ApoE peptide. Isoform Δex5-8 generates the highest CTF; Δex4-6 generates the lowest. Differential CTF generation correlates with proteolytic release of the transcriptionally active ICD (mediated via Mint1 adaptor). Loss of mouse Apoer2 decreases miniature excitatory event frequency; rescue with human APOER2-FL or Δex4-6 (but not Δex5-8) restores this frequency.\",\n      \"method\": \"Identification of 25 human APOER2 isoforms by gene-specific PCR sequencing, CTF immunoblot, ICD nuclear fractionation, Mint1 interaction assay, Apoer2 knockout neurons with lentiviral rescue, miniature EPSC recordings\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific cleavage assays, genetic KO with lentiviral rescue, electrophysiology, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35414534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"An ApoER2 variant with a highly glycosylated O-linked sugar domain has a high affinity for SeP (Kd = 0.67 nM) in Jurkat cells. This high-affinity variant mediates selenium transport via SeP through a selenocysteine lyase-independent pathway, in contrast to the Sec lyase-dependent degradation pathway in low-affinity cells. Acidification of intracellular vesicles is necessary for selenium transport via SeP in both cell types.\",\n      \"method\": \"ApoER2 variant characterization, SeP binding affinity measurement, siRNA knockdown, 75Se uptake assay, selenocysteine lyase inhibition, lysosomal acidification inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative binding measurement, siRNA knockdown, isotopic selenium transport assay, mechanistic pathway dissection, single lab\",\n      \"pmids\": [\"37406814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dab1 mediates colocalization of multi-adaptor CIN85 with ApoER2 in neurons. Stimulation with active Reelin fragment recruits CIN85 to plasma membrane domains where it colocalizes with ApoER2 and Dab1, then moves to EEA1-labeled early endosomes. Tyrosine phosphorylation of Dab1 strengthens its binding to CIN85.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence colocalization, Reelin stimulation, endosome marker co-localization, phospho-Dab1 binding assay\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, live and fixed imaging colocalization with endosomal markers, Reelin-stimulation dynamics, single lab\",\n      \"pmids\": [\"23506116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ApoER2 (apoER2) activation by PP2A in trophoblasts driven by antiphospholipid antibodies promotes preeclampsia in a mouse model of antiphospholipid syndrome, demonstrating ApoER2-PP2A signaling in trophoblasts as a mechanistic driver of preeclampsia pathogenesis.\",\n      \"method\": \"Mouse model of antiphospholipid syndrome, trophoblast-specific genetic approaches, PP2A activity assays, preeclampsia phenotypic readouts\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with mechanistic PP2A-ApoER2 pathway placement, single lab\",\n      \"pmids\": [\"34404233\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LRP8/ApoER2 is a multifunctional transmembrane receptor of the LDL receptor family that operates as a signal transducer and endocytic receptor: it binds Reelin, clusterin, thrombospondin-1, ApoE, selenoprotein P, activated protein C, factor XI, β2-glycoprotein I, and viral glycoproteins, transducing signals primarily through Dab1 tyrosine phosphorylation and downstream PI3K/Akt, JNK, and ERK pathways; its cytoplasmic NPxY motif mediates clathrin-dependent endocytosis via Dab2, while its proline-rich insert recruits JIP scaffold proteins; γ-secretase-dependent cleavage releases a transcriptionally active ICD; PCSK9 and IDOL ubiquitin ligase regulate ApoER2 protein levels post-translationally; the receptor is subject to extensive alternative splicing that differentially regulates Reelin binding, proteolytic processing, and synaptic function; in the brain it controls neuronal migration and layer formation, synaptic plasticity, LTP, and memory; in endothelium it mediates eNOS regulation and thrombosis via a PP2A–Dab2–SHC1 complex; in the testis and brain it mediates selenoprotein P–dependent selenium uptake; and in cancer cells it drives Wnt/β-catenin signaling and ferroptosis resistance through selenocysteine supply for GPX4 synthesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LRP8/ApoER2 is a multifunctional LDL-receptor-family transmembrane protein that operates simultaneously as a signal transducer, endocytic/recycling receptor, and selenium-uptake receptor across the nervous, vascular, and reproductive systems [#2, #4, #18]. In neurons it binds Reelin with high affinity and, upon ligand-induced clustering of pre-formed homo-oligomers, drives tyrosine phosphorylation of the adaptor Dab1 and downstream PI3K/Akt signaling, controlling neuronal precursor migration, dendritic and synaptic morphogenesis, LTP, and memory [#2, #36, #5, #31]; structural work shows the receptor ectodomain adopts a contracted-open conformation with a pH-sensitive auxiliary interface that primes ligand release during endocytosis [#23]. Beyond Reelin, ApoER2 is engaged by a broad ligand repertoire — thrombospondin-1, clusterin, F-spondin, ApoE, activated protein C, factor XI, \\u03b22-glycoprotein I, and selenoprotein P — that converge on Dab1 but produce distinct signaling outputs and receptor fates [#6, #20, #7, #30, #8, #15, #16, #4]. Signal output and trafficking are encoded in the cytoplasmic tail: an NPxY/FxNPXY motif mediates clathrin-dependent endocytosis through Dab2 and recycling through SNX17, while proline-rich and exon-19-encoded segments recruit JIP scaffolds and PAR3 [#13, #19, #1, #35]. \\u03b3-Secretase/presenilin-1 cleavage releases a transcriptionally active intracellular domain that activates neuronal enhancers and represses the RELN promoter, and this processing is tuned by extensive alternative splicing of the ligand-binding repeats and O-linked sugar domain [#18, #22, #21, #42]. Receptor abundance is set post-translationally by PCSK9-directed lysosomal degradation and IDOL-mediated ubiquitination, with PCSK9 promoting and IDOL controlling activity-dependent synaptic ApoER2 levels [#3, #12, #9, #31]. In endothelium and trophoblasts, the apoER2 tail scaffolds a Dab2\\u2013SHC1\\u2013PP2A complex that dephosphorylates eNOS and Akt, mediating antiphospholipid-antibody-driven thrombosis and preeclampsia [#24, #10, #45]. ApoER2 also functions as the receptor for selenoprotein P-dependent selenium uptake required for spermatogenesis and for GPX4-dependent ferroptosis resistance in MYCN-amplified neuroblastoma, drives Wnt/\\u03b2-catenin signaling in osteoblasts, and serves as an entry receptor for alphaviruses and tick-borne encephalitis virus [#4, #38, #17, #37, #40].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that ApoER2 is not merely an endocytic receptor but a signaling platform, by showing it selectively assembles JNK-scaffold proteins distinguishing it from VLDLR.\",\n      \"evidence\": \"Co-IP, yeast two-hybrid, and domain mapping of ApoER2-JIP1/JIP2 interactions\",\n      \"pmids\": [\"10827199\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of JIP/JNK assembly for neuronal signaling not measured in vivo\", \"Does not address Reelin-dependence of complex formation\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved which receptors transduce the Reelin signal, demonstrating direct Reelin binding to ApoER2 and VLDLR drives Dab1 phosphorylation and that both are jointly required.\",\n      \"evidence\": \"Purified Reelin binding assays and Dab1 phosphorylation in receptor-null cortical neurons\",\n      \"pmids\": [\"12670700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors of Dab1 not delineated here\", \"Did not address ligand-specific receptor fate\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected ApoER2 to synaptic plasticity, showing it sits in postsynaptic densities, complexes with NMDA receptors, and requires an alternatively spliced exon to enhance LTP and memory.\",\n      \"evidence\": \"PSD fractionation, Co-IP, knock-in mice, LTP electrophysiology and behavior\",\n      \"pmids\": [\"16102539\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking exon-19 segment to NMDAR phosphorylation incompletely defined\", \"Identity of the relevant kinase not established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the endocytic machinery of ApoER2, mapping clathrin-mediated internalization to the cytoplasmic FxNPXY motif via the adaptor Dab2.\",\n      \"evidence\": \"Dominant-negative eps15/Dab2, clathrin inhibition, internalization and Co-IP assays\",\n      \"pmids\": [\"16101684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recycling versus degradative sorting not resolved\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified ApoER2 as a selenium-uptake receptor, showing it binds selenoprotein P in Sertoli cells and is required for testis selenium and normal spermatogenesis.\",\n      \"evidence\": \"Sepp1 affinity chromatography/MS, Co-IP, ApoER2-knockout mice, selenium measurement\",\n      \"pmids\": [\"17314095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular fate of Sepp1-derived selenium not detailed\", \"Whether signaling and uptake share receptor pools unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed post-translational control of receptor levels, showing PCSK9 targets ApoER2 to lysosomes in a catalysis-independent manner.\",\n      \"evidence\": \"Co-expression, secreted-protein re-internalization, catalytically inactive PCSK9, lysosomal targeting immunoblots\",\n      \"pmids\": [\"18039658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological tissue context of PCSK9 regulation not addressed here\", \"Binding interface on ApoER2 not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Expanded the ApoER2 ligand repertoire and showed ligand-specific signaling outcomes, with thrombospondin-1 inducing Dab1 phosphorylation but not Akt activation or Dab1 degradation, and stabilizing migrating neuroblast chains.\",\n      \"evidence\": \"Ligand binding, Dab1 phospho-immunoblot, THBS-1 knockout mice, SVZ explants\",\n      \"pmids\": [\"18946489\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for differential signaling versus Reelin unknown\", \"Receptor selectivity between ApoER2/VLDLR not dissected\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed ApoER2 functions in Reelin-independent migration, with ApoER2/Dab1 required for SVZ-to-olfactory-bulb chain migration.\",\n      \"evidence\": \"Compound knockout mice, organotypic migration assay, neuroanatomy\",\n      \"pmids\": [\"17494763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand driving Reelin-independent migration not identified in this study\", \"Signaling pathway downstream not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated ApoER2 as a vascular/coagulation signaling receptor, showing high-affinity activated protein C binding selectively to ApoER2 drives Dab1/Akt/GSK3\\u03b2 phosphorylation via PI3K.\",\n      \"evidence\": \"SPR binding, siRNA knockdown, phospho-immunoblots, PI3K inhibition\",\n      \"pmids\": [\"19116273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo vascular consequences not addressed in this study\", \"Cell-type specificity of APC signaling not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Dissociated ApoER2's signaling and selenium-uptake functions, proving via cytoplasmic-domain knock-in mice that neurological defects arise from disrupted Reelin signaling, not impaired selenium uptake.\",\n      \"evidence\": \"Signaling-impaired cytoplasmic-domain knock-in mice with tissue selenium and neurological phenotyping\",\n      \"pmids\": [\"19007311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Extracellular determinants of selenium uptake not mapped here\", \"Does not address overlap in other tissues\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed alternative splicing of ligand-binding repeats tunes Reelin affinity, establishing receptor isoform diversity as a regulatory layer.\",\n      \"evidence\": \"Quantitative binding of Reelin fragments to LA-repeat splice variants, neuron signaling assays\",\n      \"pmids\": [\"19167437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo significance of specific isoforms not tested\", \"Single-lab binding analysis\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linked membrane microdomain sorting to divergent receptor fates, showing raft-resident ApoER2 generates fragments and is lysosomally degraded whereas VLDLR is not.\",\n      \"evidence\": \"Chimeric receptors, raft fractionation, Reelin endocytosis and degradation assays\",\n      \"pmids\": [\"19948739\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative feedback consequences only inferred\", \"Single-lab domain-swap approach\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified IDOL-mediated ubiquitination as a second post-translational control of ApoER2/VLDLR levels linking LXR to Reelin signaling.\",\n      \"evidence\": \"Ubiquitination assays, LXR pharmacology in mice, Dab1 phospho-readouts\",\n      \"pmids\": [\"20427281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuronal physiological role addressed only later\", \"Relative contribution of PCSK9 vs IDOL not compared\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the endothelial pathomechanism of antiphospholipid antibodies, showing ApoER2-dependent \\u03b22GPI-driven PP2A antagonism of eNOS underlies thrombosis.\",\n      \"evidence\": \"ApoER2-knockout mice, in vivo thrombosis, eNOS phospho-immunoblot, PP2A activity\",\n      \"pmids\": [\"21123944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular architecture of the PP2A scaffold not yet resolved (later defined)\", \"Other antibody targets not excluded\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended ApoER2 ubiquitin/degradation regulation to neuronal survival, showing PCSK9 promotes apoptosis by lowering ApoER2 and its ERK/JNK signaling.\",\n      \"evidence\": \"RNAi knockdown, caspase/apoptosis assays, signaling inhibition in cerebellar granule neurons\",\n      \"pmids\": [\"22481440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous PCSK9 source in brain not defined\", \"NMDAR-independence asserted but mechanism of ERK/JNK coupling unmapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed ApoER2 in tumor-suppressive endothelial signaling, identifying it as the endothelial receptor for cancer-secreted ApoE that suppresses metastatic endothelial recruitment.\",\n      \"evidence\": \"In vivo selection, siRNA, miRNA inhibition, xenograft metastasis models\",\n      \"pmids\": [\"23142051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream signaling from ApoE-ApoER2 not delineated here\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected ApoER2 to Wnt/\\u03b2-catenin-driven osteoblast differentiation, broadening its developmental signaling roles.\",\n      \"evidence\": \"siRNA/overexpression, Wnt reporter, \\u03b2-catenin immunoblot, osteoblast mineralization\",\n      \"pmids\": [\"22589174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Wnt-pathway coupling unknown\", \"In vivo skeletal phenotype not shown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Refined selenium-uptake mechanism, showing ApoER2-mediated Sepp1 uptake requires heparan sulfate proteoglycans and that lysosomal acidification is needed for selenium utilization but not uptake.\",\n      \"evidence\": \"siRNA, 75Se uptake, affinity chromatography/MS, lysosomal inhibition in myoblasts\",\n      \"pmids\": [\"22761431\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"HSPG identity not specified\", \"Generalizability across cell types only partly tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed \\u03b3-secretase-generated ApoER2 CTF acts as a transcriptional repressor of RELN, establishing a feedback loop between receptor processing and ligand expression.\",\n      \"evidence\": \"PS1 conditional knockout mice, ChIP, luciferase reporter, nuclear fractionation\",\n      \"pmids\": [\"24344333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors enabling CTF promoter binding unidentified\", \"Genomic breadth of CTF targets not mapped here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Added clusterin as a Reelin-mimetic ligand that triggers Dab1/PI3K/Akt/cofilin signaling and supports SVZ neuroblast chains.\",\n      \"evidence\": \"Binding/internalization, signaling immunoblots, SVZ explants with blocking antibody\",\n      \"pmids\": [\"24381170\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding interface on ApoER2 not mapped\", \"Single-lab functional study\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped Reelin-induced adaptor dynamics, showing Dab1 phosphorylation recruits CIN85 to ApoER2 and traffics it to early endosomes.\",\n      \"evidence\": \"Co-IP, immunofluorescence colocalization with endosomal markers, phospho-Dab1 binding\",\n      \"pmids\": [\"23506116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional output of CIN85 recruitment not defined\", \"Single-lab imaging study\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified SNX17 as a recycling factor that protects ApoER2 from Reelin-induced degradation and supports dendritic development.\",\n      \"evidence\": \"GST pull-down, Co-IP, recycling assay, siRNA, neuronal morphology, Dab1 phospho-assay\",\n      \"pmids\": [\"24705369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo requirement not tested\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined ApoE-isoform-specific endothelial signaling and a human loss-of-function variant, showing ApoE3-ApoER2 stimulates eNOS and migration while ApoE4 antagonizes it and the R952Q variant impairs function.\",\n      \"evidence\": \"eNOS/migration/adhesion assays, ApoER2-knockout reendothelialization and neointima models, adenoviral apoE\",\n      \"pmids\": [\"25197062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ApoE3/E4 discrimination at receptor not resolved\", \"Human variant studied functionally, not clinically\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed neurotrophin signaling regulates ApoER2 proteolysis, with TrkA/TrkB activation inducing metalloproteinase-dependent shedding independent of MAPK/PI3K.\",\n      \"evidence\": \"TrkA/TrkB activation, metalloproteinase and pathway inhibitors, CTF immunoblot\",\n      \"pmids\": [\"25233900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the responsible sheddase not established\", \"Downstream transcriptional consequence not measured\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the O-linked sugar domain (exon 16) as a regulator of receptor cleavage and synaptic output, with its absence reducing cleavage and altering spine density and synaptic efficacy in vivo.\",\n      \"evidence\": \"Knock-in mice, cleavage assays, spine quantification, LTP electrophysiology, behavior\",\n      \"pmids\": [\"25429077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which cleavage controls synaptic strength not fully resolved\", \"Sheddase responsible not identified here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined a synapse-to-nucleus pathway whereby Reelin-induced, \\u03b3-secretase-dependent ApoER2 ICD release activates neuronal enhancers governing memory.\",\n      \"evidence\": \"In vivo ChIP-seq, \\u03b3-secretase inhibition, ICD nuclear fractionation, behavior\",\n      \"pmids\": [\"25892301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA-binding partners of the ICD not all identified\", \"Distinction from CTF repressor role at RELN not reconciled\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended ApoER2-Reelin signaling to peripheral nerve repair, showing the exon-19/proline-rich variant binds PAR3 and activates Rac1 via Tiam1 to drive Schwann cell migration.\",\n      \"evidence\": \"FRET Rac1 activation, Co-IP, siRNA, migration assay, nerve injury model\",\n      \"pmids\": [\"26386179\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo regeneration outcome not quantified\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided translational proof that correcting ApoER2 exon-19 splicing improves synaptic function and memory in AD mice and that this splicing is deregulated in AD patient brain.\",\n      \"evidence\": \"ASO treatment in AD mice, human postmortem splice analysis, electrophysiology, behavior\",\n      \"pmids\": [\"26902204\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking exon-19 loss to AD pathology incompletely defined\", \"Single-lab therapeutic study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed disease-linked presenilin-1 mutations disrupt ApoER2 processing and surface trafficking, connecting familial AD machinery to receptor biology.\",\n      \"evidence\": \"PS1 mutant cell lines, CTF immunoblot, surface biotinylation, \\u03b3-secretase inhibition\",\n      \"pmids\": [\"27810638\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo consequences of altered ApoER2 processing not tested\", \"Single-lab cell study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the activity-dependent control of synaptic ApoER2 by IDOL ubiquitination governing spine remodeling and LTP.\",\n      \"evidence\": \"IDOL-knockout neurons, spine imaging, LTP, barrel cortex plasticity, behavior\",\n      \"pmids\": [\"28891791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that triggers IDOL action on ApoER2 not defined\", \"Crosstalk with PCSK9 pathway not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified GRIP1-bridged ApoER2-ephrinB2-AMPA receptor complexes required for activity-induced AMPA insertion and LTP.\",\n      \"evidence\": \"Co-IP, ephrinB2 Ser-9 knock-in mice, AMPA surface insertion, LTP\",\n      \"pmids\": [\"28978486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase for ephrinB2 Ser-9 not identified\", \"Relationship to Reelin-Dab1 signaling not delineated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the structural basis of Reelin recognition and pH-triggered release, showing ApoER2 adopts a contracted-open conformation with an auxiliary low-affinity interface destabilized during endocytosis.\",\n      \"evidence\": \"X-ray crystallography of ectodomain-Reelin fragment complex with mutational and pH-dependent binding analysis\",\n      \"pmids\": [\"28446613\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length signaling-competent cluster not solved\", \"Conformations with other ligands unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Explained how ligand form dictates signaling, showing full-length Reelin rearranges pre-formed ApoER2 oligomers into higher-order clusters that trigger Dab1 phosphorylation whereas the central fragment does not.\",\n      \"evidence\": \"FLIM/FRET and fluorescence anisotropy of tagged receptors in HEK293 cells\",\n      \"pmids\": [\"30873003\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cluster stoichiometry in neurons not measured\", \"Single-lab biophysical study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked ApoER2 to cell-cycle control in vascular smooth muscle, showing it is required for PP2A-CDC20 interaction, APC/C activity, and prevention of senescence.\",\n      \"evidence\": \"Co-IP of ApoER2 with PP2A-C/CDC20, cell-cycle immunoblots, senescence assays, Lrp8-knockout mice\",\n      \"pmids\": [\"31412739\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling a surface receptor to mitotic APC/C unclear\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the molecular architecture of the pathogenic endothelial PP2A scaffold, showing the apoER2 tail recruits Dab2 (promoting PP2A catalytic-subunit methylation) and SHC1 (recruiting the scaffolding subunit) to dephosphorylate Akt/eNOS and drive thrombosis.\",\n      \"evidence\": \"Domain-specific mutational Co-IP, PP2A activity, mouse thrombosis, ApoER2-knockout\",\n      \"pmids\": [\"29500169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How antibody engagement initiates assembly structurally undefined\", \"Therapeutic targetability not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended the apoER2-PP2A pathomechanism to pregnancy, implicating trophoblast apoER2-PP2A signaling in antiphospholipid-driven preeclampsia.\",\n      \"evidence\": \"Mouse antiphospholipid syndrome model, trophoblast genetics, PP2A activity, preeclampsia readouts\",\n      \"pmids\": [\"34404233\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trophoblast-specific receptor partners not fully mapped\", \"Single-lab in vivo study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed an unexpected role as a viral entry receptor, showing alphavirus E2-E1 glycoproteins engage ApoER2/VLDLR ligand-binding domains to mediate infection.\",\n      \"evidence\": \"Ectopic expression entry assays, VLP internalization, LBD-Fc blocking, mouse challenge\",\n      \"pmids\": [\"34929721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative ApoER2 vs VLDLR contribution in vivo not separated\", \"Tissue tropism determinants unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed human APOER2 isoform diversity tunes CTF/ICD generation and synaptic function, with specific repeat deletions altering transmission via Mint1-mediated ICD release.\",\n      \"evidence\": \"Sequencing of 25 human isoforms, CTF immunoblot, ICD fractionation, Mint1 assay, knockout-rescue, mEPSC recordings\",\n      \"pmids\": [\"35414534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo prevalence of disease-relevant isoforms unknown\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established a high-affinity O-glycosylated ApoER2 variant mediating selenocysteine-lyase-independent selenium transport, refining how isoforms determine selenium handling.\",\n      \"evidence\": \"Variant characterization, SeP binding affinity, siRNA, 75Se uptake, Sec lyase and acidification inhibition\",\n      \"pmids\": [\"37406814\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological tissues using this pathway not defined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified ApoER2 as a ferroptosis-resistance determinant in cancer, showing LRP8-mediated SELENOP uptake supplies selenocysteine for GPX4 translation in MYCN-amplified neuroblastoma.\",\n      \"evidence\": \"CRISPR activation screen, constitutive/inducible LRP8 knockout in xenografts, ferroptosis and GPX4 assays\",\n      \"pmids\": [\"37435859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability beyond low-system-Xc- cancers limited\", \"Targetability for therapy not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified ApoER2 as a receptor for tick-borne encephalitis virus, showing direct E-glycoprotein binding mediates attachment/internalization and a soluble decoy protects mice.\",\n      \"evidence\": \"Genome-scale CRISPR screen, overexpression/knockdown, direct binding, decoy in cells and mouse challenge\",\n      \"pmids\": [\"40993380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution to neurotropism in vivo not dissected\", \"Receptor usage relative to other flavivirus receptors unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single receptor coordinates its mutually exclusive roles — Reelin signaling, broad-ligand transduction, selenium transport, viral entry, and cytoplasmic PP2A/cell-cycle scaffolding — through isoform choice, glycosylation, microdomain sorting, and ubiquitin/protease control remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of how isoform/glycosylation states partition signaling vs transport functions\", \"Structures of full-length signaling clusters and ligand-specific conformations lacking\", \"Direct nuclear partners of the ICD/CTF incompletely identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [37, 40]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [4, 27, 38, 43]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 8, 20, 6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 13, 19, 24]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [30, 11]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [18, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 13, 30]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [19, 44, 14]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [3, 14, 27]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 22, 42]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8, 17, 36]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 17, 35]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 18, 31, 32]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [10, 15, 16, 24]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [4, 27, 38, 43]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [13, 19, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 38]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 9, 18, 22]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [37, 40, 45, 10]}\n    ],\n    \"complexes\": [\n      \"ApoER2-NMDA receptor postsynaptic complex\",\n      \"apoER2-Dab2-SHC1-PP2A endothelial complex\",\n      \"ApoER2-ephrinB2-AMPA receptor (GRIP1) complex\",\n      \"APC/C-CDC20 (PP2A) mitotic complex\"\n    ],\n    \"partners\": [\n      \"DAB1\",\n      \"DAB2\",\n      \"RELN\",\n      \"PCSK9\",\n      \"MYLIP\",\n      \"SELENOP\",\n      \"SNX17\",\n      \"APP\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}