{"gene":"LRP5","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2001,"finding":"LRP5 is expressed by osteoblasts and can transduce Wnt signaling via the canonical (β-catenin) pathway in vitro; a mutant secreted form of LRP5 reduces bone thickness in mouse calvarial explant cultures, establishing LRP5 as a functional Wnt co-receptor required for bone accrual.","method":"In situ expression analysis, in vitro Wnt signaling assay, mouse calvarial explant culture with dominant-negative LRP5","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (expression, in vitro signaling, explant loss-of-function), foundational paper replicated extensively by subsequent work","pmids":["11719191"],"is_preprint":false},{"year":1998,"finding":"LRP5 (originally cloned as LR3) is a single-pass transmembrane LDL receptor family protein with extracellular YWTD/EGF repeat domains; its ectodomain alone is sufficient for mitogenic activity in NIH 3T3 cells, whereas the intracellular domain has no proliferative effect.","method":"cDNA cloning from human osteoblast library, transfection of full-length, ectodomain-only, and intracellular-domain-only constructs into NIH 3T3 cells with proliferation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional dissection with domain-deletion constructs, single lab, single publication","pmids":["9790987"],"is_preprint":false},{"year":2005,"finding":"Sclerostin binds directly to the first two YWTD-EGF repeat domains of LRP5 (and LRP6) and antagonizes canonical Wnt signaling; overexpression of LRP5 reverses sclerostin-mediated inhibition. Canonical Wnt ligand does not appear to compete with sclerostin for binding to LRP5.","method":"Co-immunoprecipitation/binding assay in HEK293T and MC3T3 cells, domain-deletion mapping, luciferase Wnt reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays plus functional rescue, replicated in subsequent work","pmids":["15778503"],"is_preprint":false},{"year":2004,"finding":"The high-bone-mass G171V mutation in LRP5 disrupts LRP5 interaction with the chaperone Mesd, reducing LRP5 cell-surface levels. The third YWTD repeat (not the first) is required for DKK1-mediated antagonism of LRP5. In an autocrine Wnt paradigm, the G171V mutation does not reduce Wnt signaling despite fewer surface receptors, explaining its gain-of-function phenotype.","method":"Co-immunoprecipitation, cell-surface biotinylation, domain-deletion mutagenesis, Wnt reporter assays (paracrine vs. autocrine paradigm)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods including mutagenesis, binding assay, and functional signaling assay in a single focused study","pmids":["15143163"],"is_preprint":false},{"year":2008,"finding":"DKK1 and sclerostin independently (not synergistically) regulate LRP5 signaling; DKK1 can displace sclerostin from pre-formed sclerostin–LRP5 complexes, and neither inhibitor efficiently inhibits any of six tested HBM-LRP5 mutants.","method":"Co-immunoprecipitation competition assays, Wnt luciferase reporter assays with HBM-LRP5 mutants","journal":"Calcified tissue international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding and functional assays, single lab","pmids":["18521528"],"is_preprint":false},{"year":2005,"finding":"The cytoplasmic domain of LRP5 interacts with Frat1; Wnt3a or constitutively active truncated LRP5 (LRP5C) induces Frat1 recruitment to the cell membrane. Dishevelled positively regulates LRP5/Frat1 interaction. Axin co-immunoprecipitates with Frat1 and LRP5 at the membrane, linking LRP5 to Axin degradation and GSK3 inhibition upstream of β-catenin.","method":"Yeast two-hybrid screen, co-immunoprecipitation, dominant-negative Dishevelled overexpression, TCF-1 luciferase reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by co-IP and functional reporter, single lab","pmids":["15699046"],"is_preprint":false},{"year":2011,"finding":"LRP5 and LRP6 differ in their in vivo phosphorylation efficiency rather than in Axin-binding affinity: in vitro phosphorylated LRP5C and LRP6C bind Axin similarly, but LRP5C receives much less phosphorylation in cells. A 'gap4' region between the two most C-terminal PPPSPxS motifs accounts for much of the difference; alterations in gap4 enhance LRP5 PPPSPxS phosphorylation to LRP6 levels. Phosphorylated LRP5/6 binds Axin directly without requiring GSK3 as a bridge.","method":"Chimeric receptor domain swaps, in vitro phosphorylation assay, Axin co-immunoprecipitation, luciferase Wnt reporter assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution combined with mutagenesis and functional assays, single lab with multiple orthogonal methods","pmids":["21887268"],"is_preprint":false},{"year":2013,"finding":"Norrin forms a dimeric cystine-knot structure and contains separate binding sites for Frizzled 4 and for LRP5 (or LRP6); Norrin induces a ternary signaling complex with Fz4 and LRP5/6 by binding their respective extracellular domains rather than inducing Fz4 dimerization.","method":"X-ray crystallography, functional co-immunoprecipitation, cell-based signaling assays with mutant Norrin","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biochemical binding validation plus functional assays","pmids":["24186977"],"is_preprint":false},{"year":2015,"finding":"Crystal structure and SAXS of Norrin–Fz4CRD complex reveal that Norrin mimics Wnt for Frizzled recognition; distinct patches on Norrin mediate Fz4 and putative LRP5/6 binding, and a GAG binding site spans both Norrin and Fz4CRD.","method":"X-ray crystallography, small-angle X-ray scattering, site-directed mutagenesis, cell-based signaling assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure plus mutagenesis validation, single study","pmids":["26158506"],"is_preprint":false},{"year":2004,"finding":"Lrp5 and Lrp6 are genetically redundant co-receptors for Wnt signaling in bone and limb development; compound Lrp5/Lrp6 mutant mice show dose-dependent reductions in BMD and limb defects not seen with either single mutant alone.","method":"Generation of compound Lrp5/Lrp6 mutant mice, DXA, micro-CT skeletal analysis","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with dose-dependent phenotype across multiple genotypic classes, peer-reviewed","pmids":["15537447"],"is_preprint":false},{"year":2004,"finding":"Lrp5 and Lrp6 are functionally redundant Wnt co-receptors essential for gastrulation; double-homozygous null mice fail to establish a primitive streak, and Lrp5(+/−);Lrp6(−/−) embryos show selective loss of paraxial mesoderm and expansion of anterior structures, consistent with a Wnt–Fgf pathway link.","method":"Compound Lrp5/Lrp6 knockout mouse analysis, embryological staging, gene expression analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis across multiple compound mutant classes with clear mechanistic phenotype","pmids":["15142971"],"is_preprint":false},{"year":2010,"finding":"Lrp5 enhances bone formation by inhibiting, in duodenal enterochromaffin cells, expression of tryptophan hydroxylase 1 (Tph1), the rate-limiting enzyme in gut serotonin synthesis; elevated circulating serotonin inhibits osteoblast proliferation via Htr1b/CREB. This Wnt-independent, gut-mediated mechanism accounts for LRP5's effect on bone formation.","method":"Conditional gene deletion (intestine-specific Lrp5 KO), microarray, serum serotonin measurement in Lrp5−/− mice and OPPG patients, pharmacological serotonin normalization rescue experiment","journal":"Annals of the New York Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus rescue experiment plus human patient data, multiple orthogonal methods; note this mechanism is debated by later studies","pmids":["20392224"],"is_preprint":false},{"year":2017,"finding":"Conditional mammary-specific Lrp5 deletion (WAP-Cre×Lrp5FL/FL) during lactation increases serotonin concentrations in both mammary gland and systemic circulation, establishing that mammary-derived Lrp5 regulates local and circulating serotonin levels without affecting milk yield or alveolar morphology.","method":"Conditional knockout (WAP-Cre×Lrp5FL/FL) mouse model, serotonin measurement in gland and serum, alveolar morphology assessment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with direct serotonin measurement, single lab","pmids":["29123193"],"is_preprint":false},{"year":2015,"finding":"LRP5 regulates fatty acid β-oxidation in osteoblasts via a Wnt/β-catenin axis that is not shared by LRP6; osteoblast/osteocyte-specific Lrp5 knockout mice show increased body fat and reduced energy expenditure, and HBM-Lrp5 mice are leaner with lower triglyceride levels. Downstream β-catenin activation by Lrp5 (not Lrp6) induces key FAO enzyme expression.","method":"Osteoblast/osteocyte-conditional Lrp5 KO mice, HBM-Lrp5 knock-in mice, metabolic phenotyping, gene expression analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO and gain-of-function knock-in with metabolic phenotyping, multiple orthogonal readouts","pmids":["25802278"],"is_preprint":false},{"year":2015,"finding":"LRP5 (and LRP6) directly bind Frizzled receptors through the LRP6 ectodomain; this direct LRP5/6–Frizzled interaction prevents Frizzled-mediated non-canonical Wnt pathway activation and suppresses non-canonical pathway-dependent tumour cell migration and metastasis in vitro and in vivo.","method":"Co-immunoprecipitation, recombinant LRP6 ectodomain protein rescue experiment, tumour cell migration assay, in vivo metastasis model","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional rescue with recombinant protein, single lab","pmids":["25902418"],"is_preprint":false},{"year":2018,"finding":"FZD–LRP5/6 homo- and hetero-oligomerization on the cell surface, independently of Wnt ligands, recruits Dishevelled into the LRP5/6 signalosome and drives ligand-independent β-catenin signaling; specific FZDs expressed in hepatoma cells promote LRP5/β-catenin activation without Wnt.","method":"Co-immunoprecipitation of FZD–LRP5/6 complexes, dominant-negative constructs, luciferase β-catenin reporter assay in HepG2 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional reporter, single lab, mechanistic follow-up with dominant negatives","pmids":["30361437"],"is_preprint":false},{"year":2014,"finding":"Lrp5 promotes pulmonary fibrosis through β-catenin signaling upstream of TGF-β production; Lrp5-null mice are protected from bleomycin-induced fibrosis with reduced TGF-β1 production by alveolar type 2 cells and leukocytes. Lrp5-null mice are not protected from fibrosis induced by exogenous active TGF-β, placing Lrp5 upstream of TGF-β.","method":"Lrp5 knockout mouse model, bleomycin and adeno-TGF-β fibrosis models, bone marrow transplantation, β-catenin inhibitor treatment, cytokine measurement","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple complementary in vivo models (KO, pharmacological inhibition, BMT), epistasis with TGF-β","pmids":["24921217"],"is_preprint":false},{"year":2018,"finding":"Wnt1 promotes bone formation independently of LRP5; loss of LRP5 does not reduce the bone-anabolic effect of conditional Wnt1 overexpression in osteoblasts, demonstrating that Wnt1's bone-forming activity can proceed without this co-receptor.","method":"Conditional osteoblast-specific Wnt1 overexpression crossed with Lrp5-knockout mice, bone mass and histomorphometry analysis","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in conditional double-mutant mice with quantitative skeletal phenotyping","pmids":["30404864"],"is_preprint":false},{"year":2014,"finding":"Sclerostin-induced bone loss is partially dependent on LRP5 and fully dependent on Wnt1-class LRP6 signaling; Sost deficiency bone gain is blunted but not abolished in Lrp5−/− mice, and is completely reversed by selective blockade of Wnt1-class LRP6 activity.","method":"Sost−/−;Lrp5−/− double-knockout mice, LRP6-blocking monoclonal antibodies with Wnt-class selectivity, micro-CT and histomorphometry","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in double-KO combined with pharmacological antibody dissection, multiple skeletal phenotype readouts","pmids":["23901037"],"is_preprint":false},{"year":2020,"finding":"LRP5 promotes tubulointerstitial fibrosis via a Wnt-independent mechanism: LRP5 directly co-immunoprecipitates with TGF-β receptors I and II through its extracellular domain, stabilizes TβRs at the membrane, enhances TGF-β1-induced TβR internalization, and activates Smad2/3 nuclear translocation.","method":"Lrp5 knockout in obstructive nephropathy mouse model, LRP5 overexpression in tubular epithelial cells, co-immunoprecipitation of LRP5–TβRI/II, Smad2/3 nuclear translocation assay","journal":"Signal transduction and targeted therapy","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct co-IP of LRP5 with TβRs plus domain-mapping plus in vivo KO with functional readout, single lab but multiple orthogonal methods","pmids":["32345960"],"is_preprint":false},{"year":2012,"finding":"LRP5 regulates lung microvascular and alveolar development by controlling Tie2 expression in endothelial cells; LRP5 knockdown decreases Tie2 levels and inhibits vascular/alveolar growth when Ang1 is dominant, while high LRP5 and Tie2 expression under Ang2-dominated conditions suppress angiogenesis.","method":"LRP5 siRNA knockdown in cultured endothelial cells and neonatal mouse lungs, Tie2 expression assay, in vivo hyperoxia and pneumonectomy models","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo knockdown with mechanistic pathway readout (Tie2 expression), single lab","pmids":["22848540"],"is_preprint":false},{"year":2016,"finding":"Endothelium-derived LRP5 is both necessary and sufficient for retinal vascular development; endothelium-specific deletion of LRP5 (using Flk1-Cre) recapitulates the hypovascularization of Lrp5−/− retinas, and endothelial LRP5 restoration in Lrp5−/− mice rescues retinal vascular defects. Retinal vascularization depends on LRP5 in a dosage-dependent manner and does not depend on LRP6.","method":"Endothelium-specific Lrp5 conditional KO (Flk1-Cre), rescue by endothelial-specific LRP5 re-expression in global Lrp5−/− mice, retinal vascular phenotype analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus cell-type-specific rescue experiment, clear necessity and sufficiency demonstration","pmids":["27031698"],"is_preprint":false},{"year":2012,"finding":"Lrp5 and Lrp6 are functionally redundant in intestinal epithelium; single-gene gut-specific knockouts (villin-Cre) are viable with normal intestines, but double Lrp5/Lrp6 gut-knockout pups die within 1 day of birth with absent proliferation, premature differentiation, and reduced cyclin D1 in intestinal epithelium.","method":"Villin-Cre conditional double-knockout mice, immunohistochemistry for proliferation/differentiation markers and cyclin D1","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in compound conditional KO with mechanistic Wnt target readout","pmids":["21866564"],"is_preprint":false},{"year":2018,"finding":"JAM3 directly associates with LRP5 to activate the PDK1/AKT pathway, which suppresses GSK3β and activates β-catenin/CCND1 signaling to maintain leukemia-initiating cell self-renewal; JAM3-LRP5 interaction is required for LIC maintenance but not normal HSC function.","method":"Co-immunoprecipitation of JAM3 with LRP5, JAM3 knockout in AML mouse model, serial transplantation, JAM3 knockdown in human leukemia cells, pathway component analysis (pAKT, GSK3β, β-catenin, CCND1)","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP binding demonstrated plus in vivo genetic KO phenotype with downstream pathway readouts, single lab","pmids":["29584620"],"is_preprint":false},{"year":2015,"finding":"LRP5 loss in macrophages reduces intracellular cholesterol ester accumulation (lipid uptake); LRP5 forms a complex with PCSK9 in lipid-loaded macrophages; in the absence of LRP5, PCSK9 release is reduced, implicating LRP5 in PCSK9 secretion from macrophages.","method":"LRP5 and PCSK9 siRNA silencing in primary human macrophages, cholesterol ester accumulation assay, co-immunoprecipitation of LRP5–PCSK9","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional silencing, single lab","pmids":["32991689"],"is_preprint":false},{"year":2022,"finding":"B7-1 activates podocyte β-catenin signaling through a B7-1–Hsp90ab1–LRP5 complex; Hsp90ab1 residue K69 is the key binding site for B7-1 transmission to LRP5/β-catenin; B7-1 is also a downstream target of β-catenin, forming a feedforward loop mediating podocyte injury.","method":"LC-MS/MS identification of Hsp90ab1, molecular docking and mutant analysis (K69 site), co-immunoprecipitation of B7-1–Hsp90ab1–LRP5 complex, B7-1 transgenic and adriamycin nephropathy mouse models, transcriptomic analysis","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based binding partner identification confirmed by co-IP and mutagenesis, in vivo validation in two models, single lab","pmids":["35710882"],"is_preprint":false},{"year":2015,"finding":"LRP5 has a Wnt-independent role in glucose uptake in mammary epithelial cells; Lrp5 knockdown decreases glucose uptake, lactate secretion, and oxygen consumption and induces mitochondrial ROS accumulation and p38α activation; this function is not shared by LRP6.","method":"Lrp5 and Lrp6 shRNA knockdown in mammary epithelial cells, glucose uptake assay, lactate and oxygen consumption measurement, ROS and p38α activation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal metabolic assays with paralog comparison (LRP5 vs LRP6), clear Wnt-independence demonstrated","pmids":["26711269"],"is_preprint":false},{"year":2015,"finding":"Lrp5 is required for cranial neural crest cell (CNCC) migration in zebrafish; lrp5 knockdown and CRISPR/Cas9 editing do not impair CNCC induction but reduce proliferation of premigratory CNCCs and cause cells to cluster at ectopic positions, resulting in craniofacial skeleton malformations.","method":"Morpholino knockdown, transient CRISPR/Cas9 editing in zebrafish, in situ hybridization, cell migration tracking","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two loss-of-function approaches in zebrafish with quantitative cell-migration phenotype, single lab","pmids":["26121341"],"is_preprint":false},{"year":2010,"finding":"Both Sp1 and KLF15 transcription factors bind to the LRP5 promoter region (−72 to −53 bp) and are required for its basal transcriptional activity, as demonstrated by chromatin immunoprecipitation and transactivation assays in Drosophila SL2 cells.","method":"Luciferase reporter deletion analysis, chromatin immunoprecipitation, transactivation in Drosophila SL2 cells (lacking endogenous Sp1/KLF)","journal":"BMC genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus heterologous transactivation assay, single lab, mechanistic promoter dissection","pmids":["20141633"],"is_preprint":false},{"year":2022,"finding":"LRP5 regulates neonatal cardiomyocyte proliferation and heart regeneration via the AKT/P21 pathway: LRP5 deficiency accelerates AKT protein degradation, elevating the CDK inhibitor P21 and reducing cardiomyocyte proliferation; cardiac-specific Lrp5 deletion impairs neonatal cardiac regeneration after injury.","method":"Cardiac-specific Lrp5 conditional knockout mice, neonatal apex resection model, LRP5 overexpression, AKT/P21 pathway analysis by Western blot","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus OE with mechanistic pathway dissection, single lab","pmids":["35429093"],"is_preprint":false},{"year":2023,"finding":"Selenoprotein P (SELENOP) directly interacts with LRP5/6 through protein-protein interactions and uses this interaction to augment canonical WNT signaling activity; disruption of SELENOP–LRP5/6 binding reduces WNT target gene expression in colorectal cancer organoids.","method":"Protein-protein interaction mapping, Selenop knockout in APC-deletion mouse adenoma model, organoid WNT signaling rescue, WNT target gene expression analysis","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein interaction mapped plus in vivo and organoid functional validation, single lab","pmids":["37166989"],"is_preprint":false},{"year":2019,"finding":"Anti-LRP5/6 VHH single-domain antibodies bind the third β-propeller (P3E3P4E4) region of LRP6 (and LRP5) with nanomolar affinity, sterically blocking Wnt3/3a binding; these VHHs strongly inhibit Wnt3/3a-induced β-catenin signaling and drive terminal differentiation of Wnt-hypersensitive Rnf43/Znrf3-mutant intestinal organoids.","method":"CIS display VHH selection, structural analysis of VHH–LRP5/6 interaction, luciferase Wnt reporter assay, intestinal organoid growth assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural characterization combined with functional organoid readout, mechanistic steric-block demonstrated","pmids":["30664649"],"is_preprint":false},{"year":2020,"finding":"Co-deletion of Lrp5 and Lrp6 selectively in bone (Dmp1-Cre) nearly completely abrogates the bone-anabolic response to sclerostin monoclonal antibody, establishing that both LRP5 and LRP6 are required in osteoblast-lineage cells for sclerostin antibody action.","method":"Dmp1-Cre conditional Lrp5f/f;Lrp6f/f double-knockout mice, sclerostin mAb treatment, DXA, micro-CT, pQCT, bone histomorphometry","journal":"Bone","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional double-KO with pharmacological intervention, multiple skeletal phenotype readouts, direct mechanistic conclusion about receptor requirement","pmids":["33164872"],"is_preprint":false},{"year":2007,"finding":"MDA PCa 2b prostate cancer cells induce new bone formation through Wnt canonical signaling and this effect requires the osteoblast Wnt co-receptor Lrp5; in calvaria from Lrp5−/− mice, MDA PCa 2b cells fail to induce bone formation. DKK1 blocks osteoblast proliferation and new bone formation by MDA PCa 2b cells.","method":"Co-culture of prostate cancer cells with primary mouse osteoblasts and Lrp5−/− bone organ cultures, DKK1 functional blocking experiment","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic (Lrp5 KO organ culture) plus pharmacological (DKK1 block) evidence, single lab","pmids":["17700537"],"is_preprint":false},{"year":2025,"finding":"Butyrate decreases LRP5 mRNA stability by elevating histone H3K9 acetylation of the ZFP36 locus, transcriptionally activating the RNA-binding protein ZFP36, which then binds AU-rich elements in LRP5 transcript and accelerates its decay, thereby blocking Wnt/β-catenin activation and cancer stemness.","method":"RNA-seq, HDAC inhibitor assays, H3K9 acetylation ChIP, ZFP36 overexpression/knockdown, LRP5 mRNA stability assay, syngeneic and orthotopic tumor models","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epigenetic and post-transcriptional mechanism defined by multiple molecular assays, single lab","pmids":["40038255"],"is_preprint":false}],"current_model":"LRP5 is a single-pass transmembrane Wnt co-receptor that, upon Wnt ligand binding alongside Frizzled receptors, undergoes phosphorylation of its cytoplasmic PPPSPxS motifs (less efficiently than LRP6 due to a 'gap4' region), recruits Axin and Frat1 to the membrane, and thereby inhibits GSK3β-mediated β-catenin phosphorylation to activate canonical Wnt/β-catenin target gene transcription; its extracellular YWTD-EGF repeat domains are docking sites for inhibitors sclerostin and DKK1 (which bind non-competitively and independently), and high-bone-mass mutations in these domains reduce inhibitor binding to alter osteoblast-lineage Wnt output; beyond canonical Wnt signaling, LRP5 also operates via Wnt-independent mechanisms including gut serotonin suppression (via Tph1 inhibition), promotion of fatty acid β-oxidation in osteoblasts, regulation of glucose uptake in mammary epithelial cells, direct interaction with TGF-β receptors to activate Smad2/3 signaling in renal tubular fibrosis, and interaction with PCSK9 in macrophage lipid uptake."},"narrative":{"mechanistic_narrative":"LRP5 is a single-pass transmembrane LDL-receptor-family protein that functions as a Wnt co-receptor to activate canonical Wnt/β-catenin signaling, a role central to bone accrual and tissue development [PMID:11719191, PMID:9790987]. Upon Wnt or Norrin engagement of a ternary complex with Frizzled receptors—to which LRP5 binds directly through its ectodomain [PMID:24186977, PMID:25902418]—its cytoplasmic PPPSPxS motifs are phosphorylated and recruit Frat1 and Axin to the membrane in a Dishevelled-dependent manner, sequestering Axin and inhibiting GSK3-mediated β-catenin destruction [PMID:15699046, PMID:21887268]. LRP5 is phosphorylated less efficiently than its paralog LRP6 because of an intervening 'gap4' region, but phosphorylated LRP5 binds Axin directly without GSK3 as a bridge [PMID:21887268]. Its extracellular YWTD-EGF β-propeller repeats are docking sites for the secreted antagonists sclerostin and DKK1, which bind distinct repeats non-competitively; high-bone-mass (HBM) mutations such as G171V reduce inhibitor binding and Mesd-dependent surface trafficking to elevate osteoblast-lineage Wnt output [PMID:15778503, PMID:15143163, PMID:18521528]. LRP5 acts redundantly with LRP6 in gastrulation, limb and intestinal development, but has paralog-selective functions including β-catenin-driven fatty-acid β-oxidation in osteoblasts and Wnt-independent control of glucose uptake [PMID:15537447, PMID:15142971, PMID:21866564, PMID:25802278, PMID:26711269]. Beyond canonical Wnt signaling, LRP5 suppresses gut serotonin synthesis via Tph1 inhibition to promote bone formation [PMID:20392224], directly binds TGF-β receptors to drive Smad2/3-dependent renal fibrosis [PMID:32345960], and supports endothelial retinal vascularization [PMID:27031698]. Loss-of-function LRP5 mutations underlie osteoporosis-pseudoglioma (OPPG), consistent with reduced bone formation and elevated serotonin in patients [PMID:20392224].","teleology":[{"year":1998,"claim":"Established LRP5 as a single-pass LDL-receptor-family transmembrane protein and asked which domain carried biological activity, localizing mitogenic function to the ectodomain.","evidence":"cDNA cloning from human osteoblasts and domain-deletion transfection with proliferation assay in NIH 3T3 cells","pmids":["9790987"],"confidence":"Medium","gaps":["Did not identify the Wnt co-receptor function","Mechanism of ectodomain mitogenic activity unresolved"]},{"year":2001,"claim":"Defined LRP5 as a functional Wnt co-receptor required for bone accrual, connecting Wnt/β-catenin signaling to skeletal biology.","evidence":"In situ expression, in vitro Wnt signaling assay, and dominant-negative LRP5 in mouse calvarial explants","pmids":["11719191"],"confidence":"High","gaps":["Intracellular signaling steps not yet mapped","Did not address LRP6 redundancy"]},{"year":2004,"claim":"Resolved how LRP5 and LRP6 collaborate in vivo, showing genetic redundancy in gastrulation, limb, and bone development.","evidence":"Compound Lrp5/Lrp6 mutant mice with embryological staging, DXA, and micro-CT","pmids":["15537447","15142971"],"confidence":"High","gaps":["Tissue-specific division of labor between paralogs unresolved","Molecular basis of differential signaling not addressed"]},{"year":2004,"claim":"Explained the gain-of-function HBM G171V mutation by linking it to disrupted Mesd chaperone binding, reduced surface receptor, and DKK1-resistance dependent on the third YWTD repeat.","evidence":"Co-IP, surface biotinylation, domain mutagenesis, and paracrine vs autocrine Wnt reporter assays","pmids":["15143163"],"confidence":"High","gaps":["Did not test all HBM mutants","In vivo confirmation of autocrine paradigm lacking"]},{"year":2005,"claim":"Mapped the cytoplasmic signaling output of LRP5, showing Frat1/Axin recruitment to the membrane and Dishevelled-dependent regulation upstream of GSK3 inhibition.","evidence":"Yeast two-hybrid, co-IP, dominant-negative Dishevelled, and TCF reporter assay","pmids":["15699046"],"confidence":"Medium","gaps":["Quantitative contribution of Frat1 vs Axin unclear","Phosphorylation requirements not addressed here"]},{"year":2005,"claim":"Identified sclerostin as a direct YWTD-EGF-binding antagonist of LRP5, establishing a druggable extracellular regulatory node for bone.","evidence":"Co-IP/binding assays, domain-deletion mapping, and Wnt luciferase reporter with LRP5 overexpression rescue","pmids":["15778503"],"confidence":"High","gaps":["Relationship to DKK1 binding not yet defined","Structural details of the interaction absent"]},{"year":2008,"claim":"Clarified that DKK1 and sclerostin act independently and that HBM mutants resist both, explaining the molecular logic of inhibitor regulation.","evidence":"Co-IP competition assays and Wnt reporter assays with six HBM-LRP5 mutants","pmids":["18521528"],"confidence":"Medium","gaps":["Binding stoichiometry not quantified","Single-lab observation"]},{"year":2010,"claim":"Proposed a Wnt-independent, gut-mediated mechanism for LRP5's bone effect through Tph1 suppression and serotonin signaling.","evidence":"Intestine-specific Lrp5 KO, microarray, serum serotonin in mice and OPPG patients, plus pharmacological rescue","pmids":["20392224"],"confidence":"High","gaps":["Mechanism debated by later studies","Molecular link between LRP5 and Tph1 transcription unresolved"]},{"year":2011,"claim":"Explained why LRP5 signals less robustly than LRP6 by attributing the difference to phosphorylation efficiency governed by a 'gap4' region, not Axin affinity.","evidence":"Chimeric domain swaps, in vitro phosphorylation, Axin co-IP, and Wnt reporter assays","pmids":["21887268"],"confidence":"High","gaps":["Kinases responsible not fully defined","In vivo relevance of gap4 untested"]},{"year":2013,"claim":"Provided structural basis for ligand-induced ternary complex formation, showing Norrin bridges Fz4 and LRP5/6 via separate binding sites.","evidence":"X-ray crystallography, co-IP, and cell-based signaling with mutant Norrin","pmids":["24186977"],"confidence":"High","gaps":["Direct LRP5-Norrin contacts not crystallographically resolved","Conformational changes on LRP5 unknown"]},{"year":2015,"claim":"Extended the structural model showing Norrin mimics Wnt for Frizzled recognition and defined a GAG-binding interface across the complex.","evidence":"X-ray crystallography, SAXS, mutagenesis, and signaling assays","pmids":["26158506"],"confidence":"High","gaps":["LRP5/6 binding patch inferred, not co-crystallized","Role of GAGs in vivo untested"]},{"year":2014,"claim":"Identified paralog-selective and Wnt-independent disease roles, placing LRP5 upstream of TGF-β in pulmonary fibrosis.","evidence":"Lrp5 KO mice, bleomycin and adeno-TGF-β models, bone marrow transplantation, and β-catenin inhibition","pmids":["24921217"],"confidence":"High","gaps":["Cell-autonomous vs systemic contributions only partly dissected","Direct molecular target downstream unresolved at this stage"]},{"year":2015,"claim":"Demonstrated paralog-specific metabolic functions, with LRP5 (not LRP6) driving β-catenin-dependent fatty-acid oxidation in osteoblasts and Wnt-independent glucose uptake in mammary cells.","evidence":"Conditional Lrp5 KO and HBM knock-in mice with metabolic phenotyping; shRNA knockdown with metabolic and ROS assays","pmids":["25802278","26711269"],"confidence":"High","gaps":["Molecular basis of LRP5/LRP6 functional divergence unclear","Direct effectors of glucose-uptake function unidentified"]},{"year":2015,"claim":"Revealed that direct LRP5/6-Frizzled binding restrains non-canonical Wnt signaling and suppresses tumor cell migration.","evidence":"Co-IP, recombinant LRP6 ectodomain rescue, migration assays, and in vivo metastasis model","pmids":["25902418"],"confidence":"Medium","gaps":["LRP5-specific contribution not isolated from LRP6","Mechanism of non-canonical suppression incomplete"]},{"year":2016,"claim":"Established endothelial LRP5 as necessary and sufficient for retinal vascular development in an LRP6-independent manner.","evidence":"Endothelium-specific Lrp5 KO (Flk1-Cre) and endothelial LRP5 re-expression rescue in global KO mice","pmids":["27031698"],"confidence":"High","gaps":["Downstream endothelial Wnt targets not fully mapped","Ligand driving this signaling not defined here"]},{"year":2018,"claim":"Refined the bone signaling model by genetically dissociating Wnt1 anabolism and sclerostin action from sole LRP5 dependence.","evidence":"Conditional Wnt1-overexpression x Lrp5 KO and Sost x Lrp5 double-KO mice with LRP6-blocking antibodies","pmids":["30404864","23901037"],"confidence":"High","gaps":["Relative LRP5 vs LRP6 contributions context-dependent","Mechanism of partial LRP5 dependence unresolved"]},{"year":2018,"claim":"Uncovered ligand-independent and cancer-associated LRP5 activation modes via FZD oligomerization and a JAM3-LRP5-PDK1/AKT axis sustaining leukemia-initiating cells.","evidence":"Co-IP of FZD-LRP5/6 with dominant negatives and reporter in HepG2; JAM3-LRP5 co-IP with AML KO models and pathway readouts","pmids":["30361437","29584620"],"confidence":"Medium","gaps":["Physiological triggers of ligand-independent oligomerization unclear","Direct JAM3-LRP5 binding interface unmapped"]},{"year":2020,"claim":"Defined a Wnt-independent profibrotic mechanism whereby LRP5 directly binds and stabilizes TGF-β receptors to activate Smad2/3 in kidney.","evidence":"Lrp5 KO obstructive nephropathy, tubular LRP5 overexpression, LRP5-TβRI/II co-IP, and Smad2/3 translocation assays","pmids":["32345960"],"confidence":"High","gaps":["Domain-level TβR binding site not finely mapped","Cross-talk with canonical Wnt in fibrosis unresolved"]},{"year":2022,"claim":"Identified additional non-Wnt LRP5 partnerships, including a B7-1-Hsp90ab1-LRP5 complex in podocyte injury and AKT/P21-mediated cardiomyocyte proliferation.","evidence":"LC-MS/MS, docking/mutagenesis, co-IP, and disease mouse models for podocytes; cardiac-specific KO with AKT/P21 analysis","pmids":["35710882","35429093"],"confidence":"Medium","gaps":["Generality of these complexes beyond disease models unclear","Single-lab observations"]},{"year":2023,"claim":"Demonstrated that SELENOP directly binds LRP5/6 to augment canonical Wnt signaling in colorectal cancer.","evidence":"Protein interaction mapping, Selenop KO adenoma model, and organoid Wnt rescue","pmids":["37166989"],"confidence":"Medium","gaps":["Binding interface and stoichiometry undefined","LRP5 vs LRP6 selectivity not resolved"]},{"year":2019,"claim":"Provided targetable structural insight by showing VHH antibodies block Wnt3/3a binding at the LRP5/6 third β-propeller to inhibit β-catenin signaling.","evidence":"VHH selection, structural analysis, Wnt reporter, and Rnf43/Znrf3-mutant organoid differentiation","pmids":["30664649"],"confidence":"High","gaps":["LRP5-specific affinity vs LRP6 not separated","In vivo efficacy not addressed"]},{"year":2025,"claim":"Defined post-transcriptional control of LRP5 abundance by butyrate-driven ZFP36-mediated mRNA decay to limit Wnt-dependent cancer stemness.","evidence":"RNA-seq, H3K9ac ChIP, ZFP36 manipulation, mRNA stability assays, and tumor models","pmids":["40038255"],"confidence":"Medium","gaps":["Generality across tissues untested","Single-lab observation"]},{"year":null,"claim":"How LRP5 achieves its many paralog-selective and Wnt-independent functions through a single ectodomain/cytoplasmic architecture, and what distinguishes LRP5 from LRP6 mechanistically across tissues, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural explanation for LRP5 vs LRP6 functional divergence","Direct effectors of several Wnt-independent functions unidentified","In vivo relevance of ligand-independent oligomerization unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,7,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,3,19]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5,15,19]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,10,21,22]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[16,19,23]}],"complexes":["Wnt signalosome (FZD–LRP5/6–Dishevelled)","Norrin–Fz4–LRP5 ternary complex","B7-1–Hsp90ab1–LRP5 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Activates the canonical Wnt signaling pathway that controls cell fate determination and self-renewal during embryonic development and adult tissue regeneration (PubMed:11336703, PubMed:11719191). In particular, may play an important role in the development of the posterior patterning of the epiblast during gastrulation (By similarity). During bone development, regulates osteoblast proliferation and differentiation thus determining bone mass (PubMed:11719191). Mechanistically, the formation of the signaling complex between Wnt ligand, frizzled receptor and LRP5 coreceptor promotes the recruitment of AXIN1 to LRP5, stabilizing beta-catenin/CTNNB1 and activating TCF/LEF-mediated transcriptional programs (PubMed:11336703, PubMed:14731402, PubMed:24706814, PubMed:25920554). Acts as a coreceptor for non-Wnt proteins, such as norrin/NDP. Binding of norrin/NDP to frizzled 4/FZD4-LRP5 receptor complex triggers beta-catenin/CTNNB1-dependent signaling known to be required for retinal vascular development (PubMed:16252235, PubMed:27228167). 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VITREORETINOPATHY 6; EVR6","url":"https://www.omim.org/entry/616468"},{"mim_id":"615221","title":"BONE MINERAL DENSITY QUANTITATIVE TRAIT LOCUS 16; BMND16","url":"https://www.omim.org/entry/615221"},{"mim_id":"615220","title":"OSTEOGENESIS IMPERFECTA, TYPE XV; OI15","url":"https://www.omim.org/entry/615220"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in 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signaling via the canonical (β-catenin) pathway in vitro; a mutant secreted form of LRP5 reduces bone thickness in mouse calvarial explant cultures, establishing LRP5 as a functional Wnt co-receptor required for bone accrual.\",\n      \"method\": \"In situ expression analysis, in vitro Wnt signaling assay, mouse calvarial explant culture with dominant-negative LRP5\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (expression, in vitro signaling, explant loss-of-function), foundational paper replicated extensively by subsequent work\",\n      \"pmids\": [\"11719191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LRP5 (originally cloned as LR3) is a single-pass transmembrane LDL receptor family protein with extracellular YWTD/EGF repeat domains; its ectodomain alone is sufficient for mitogenic activity in NIH 3T3 cells, whereas the intracellular domain has no proliferative effect.\",\n      \"method\": \"cDNA cloning from human osteoblast library, transfection of full-length, ectodomain-only, and intracellular-domain-only constructs into NIH 3T3 cells with proliferation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional dissection with domain-deletion constructs, single lab, single publication\",\n      \"pmids\": [\"9790987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Sclerostin binds directly to the first two YWTD-EGF repeat domains of LRP5 (and LRP6) and antagonizes canonical Wnt signaling; overexpression of LRP5 reverses sclerostin-mediated inhibition. Canonical Wnt ligand does not appear to compete with sclerostin for binding to LRP5.\",\n      \"method\": \"Co-immunoprecipitation/binding assay in HEK293T and MC3T3 cells, domain-deletion mapping, luciferase Wnt reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays plus functional rescue, replicated in subsequent work\",\n      \"pmids\": [\"15778503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The high-bone-mass G171V mutation in LRP5 disrupts LRP5 interaction with the chaperone Mesd, reducing LRP5 cell-surface levels. The third YWTD repeat (not the first) is required for DKK1-mediated antagonism of LRP5. In an autocrine Wnt paradigm, the G171V mutation does not reduce Wnt signaling despite fewer surface receptors, explaining its gain-of-function phenotype.\",\n      \"method\": \"Co-immunoprecipitation, cell-surface biotinylation, domain-deletion mutagenesis, Wnt reporter assays (paracrine vs. autocrine paradigm)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods including mutagenesis, binding assay, and functional signaling assay in a single focused study\",\n      \"pmids\": [\"15143163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DKK1 and sclerostin independently (not synergistically) regulate LRP5 signaling; DKK1 can displace sclerostin from pre-formed sclerostin–LRP5 complexes, and neither inhibitor efficiently inhibits any of six tested HBM-LRP5 mutants.\",\n      \"method\": \"Co-immunoprecipitation competition assays, Wnt luciferase reporter assays with HBM-LRP5 mutants\",\n      \"journal\": \"Calcified tissue international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding and functional assays, single lab\",\n      \"pmids\": [\"18521528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The cytoplasmic domain of LRP5 interacts with Frat1; Wnt3a or constitutively active truncated LRP5 (LRP5C) induces Frat1 recruitment to the cell membrane. Dishevelled positively regulates LRP5/Frat1 interaction. Axin co-immunoprecipitates with Frat1 and LRP5 at the membrane, linking LRP5 to Axin degradation and GSK3 inhibition upstream of β-catenin.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, dominant-negative Dishevelled overexpression, TCF-1 luciferase reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by co-IP and functional reporter, single lab\",\n      \"pmids\": [\"15699046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LRP5 and LRP6 differ in their in vivo phosphorylation efficiency rather than in Axin-binding affinity: in vitro phosphorylated LRP5C and LRP6C bind Axin similarly, but LRP5C receives much less phosphorylation in cells. A 'gap4' region between the two most C-terminal PPPSPxS motifs accounts for much of the difference; alterations in gap4 enhance LRP5 PPPSPxS phosphorylation to LRP6 levels. Phosphorylated LRP5/6 binds Axin directly without requiring GSK3 as a bridge.\",\n      \"method\": \"Chimeric receptor domain swaps, in vitro phosphorylation assay, Axin co-immunoprecipitation, luciferase Wnt reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution combined with mutagenesis and functional assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21887268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Norrin forms a dimeric cystine-knot structure and contains separate binding sites for Frizzled 4 and for LRP5 (or LRP6); Norrin induces a ternary signaling complex with Fz4 and LRP5/6 by binding their respective extracellular domains rather than inducing Fz4 dimerization.\",\n      \"method\": \"X-ray crystallography, functional co-immunoprecipitation, cell-based signaling assays with mutant Norrin\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biochemical binding validation plus functional assays\",\n      \"pmids\": [\"24186977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure and SAXS of Norrin–Fz4CRD complex reveal that Norrin mimics Wnt for Frizzled recognition; distinct patches on Norrin mediate Fz4 and putative LRP5/6 binding, and a GAG binding site spans both Norrin and Fz4CRD.\",\n      \"method\": \"X-ray crystallography, small-angle X-ray scattering, site-directed mutagenesis, cell-based signaling assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure plus mutagenesis validation, single study\",\n      \"pmids\": [\"26158506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Lrp5 and Lrp6 are genetically redundant co-receptors for Wnt signaling in bone and limb development; compound Lrp5/Lrp6 mutant mice show dose-dependent reductions in BMD and limb defects not seen with either single mutant alone.\",\n      \"method\": \"Generation of compound Lrp5/Lrp6 mutant mice, DXA, micro-CT skeletal analysis\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with dose-dependent phenotype across multiple genotypic classes, peer-reviewed\",\n      \"pmids\": [\"15537447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Lrp5 and Lrp6 are functionally redundant Wnt co-receptors essential for gastrulation; double-homozygous null mice fail to establish a primitive streak, and Lrp5(+/−);Lrp6(−/−) embryos show selective loss of paraxial mesoderm and expansion of anterior structures, consistent with a Wnt–Fgf pathway link.\",\n      \"method\": \"Compound Lrp5/Lrp6 knockout mouse analysis, embryological staging, gene expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis across multiple compound mutant classes with clear mechanistic phenotype\",\n      \"pmids\": [\"15142971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Lrp5 enhances bone formation by inhibiting, in duodenal enterochromaffin cells, expression of tryptophan hydroxylase 1 (Tph1), the rate-limiting enzyme in gut serotonin synthesis; elevated circulating serotonin inhibits osteoblast proliferation via Htr1b/CREB. This Wnt-independent, gut-mediated mechanism accounts for LRP5's effect on bone formation.\",\n      \"method\": \"Conditional gene deletion (intestine-specific Lrp5 KO), microarray, serum serotonin measurement in Lrp5−/− mice and OPPG patients, pharmacological serotonin normalization rescue experiment\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus rescue experiment plus human patient data, multiple orthogonal methods; note this mechanism is debated by later studies\",\n      \"pmids\": [\"20392224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Conditional mammary-specific Lrp5 deletion (WAP-Cre×Lrp5FL/FL) during lactation increases serotonin concentrations in both mammary gland and systemic circulation, establishing that mammary-derived Lrp5 regulates local and circulating serotonin levels without affecting milk yield or alveolar morphology.\",\n      \"method\": \"Conditional knockout (WAP-Cre×Lrp5FL/FL) mouse model, serotonin measurement in gland and serum, alveolar morphology assessment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with direct serotonin measurement, single lab\",\n      \"pmids\": [\"29123193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRP5 regulates fatty acid β-oxidation in osteoblasts via a Wnt/β-catenin axis that is not shared by LRP6; osteoblast/osteocyte-specific Lrp5 knockout mice show increased body fat and reduced energy expenditure, and HBM-Lrp5 mice are leaner with lower triglyceride levels. Downstream β-catenin activation by Lrp5 (not Lrp6) induces key FAO enzyme expression.\",\n      \"method\": \"Osteoblast/osteocyte-conditional Lrp5 KO mice, HBM-Lrp5 knock-in mice, metabolic phenotyping, gene expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO and gain-of-function knock-in with metabolic phenotyping, multiple orthogonal readouts\",\n      \"pmids\": [\"25802278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRP5 (and LRP6) directly bind Frizzled receptors through the LRP6 ectodomain; this direct LRP5/6–Frizzled interaction prevents Frizzled-mediated non-canonical Wnt pathway activation and suppresses non-canonical pathway-dependent tumour cell migration and metastasis in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, recombinant LRP6 ectodomain protein rescue experiment, tumour cell migration assay, in vivo metastasis model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional rescue with recombinant protein, single lab\",\n      \"pmids\": [\"25902418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FZD–LRP5/6 homo- and hetero-oligomerization on the cell surface, independently of Wnt ligands, recruits Dishevelled into the LRP5/6 signalosome and drives ligand-independent β-catenin signaling; specific FZDs expressed in hepatoma cells promote LRP5/β-catenin activation without Wnt.\",\n      \"method\": \"Co-immunoprecipitation of FZD–LRP5/6 complexes, dominant-negative constructs, luciferase β-catenin reporter assay in HepG2 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional reporter, single lab, mechanistic follow-up with dominant negatives\",\n      \"pmids\": [\"30361437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Lrp5 promotes pulmonary fibrosis through β-catenin signaling upstream of TGF-β production; Lrp5-null mice are protected from bleomycin-induced fibrosis with reduced TGF-β1 production by alveolar type 2 cells and leukocytes. Lrp5-null mice are not protected from fibrosis induced by exogenous active TGF-β, placing Lrp5 upstream of TGF-β.\",\n      \"method\": \"Lrp5 knockout mouse model, bleomycin and adeno-TGF-β fibrosis models, bone marrow transplantation, β-catenin inhibitor treatment, cytokine measurement\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple complementary in vivo models (KO, pharmacological inhibition, BMT), epistasis with TGF-β\",\n      \"pmids\": [\"24921217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Wnt1 promotes bone formation independently of LRP5; loss of LRP5 does not reduce the bone-anabolic effect of conditional Wnt1 overexpression in osteoblasts, demonstrating that Wnt1's bone-forming activity can proceed without this co-receptor.\",\n      \"method\": \"Conditional osteoblast-specific Wnt1 overexpression crossed with Lrp5-knockout mice, bone mass and histomorphometry analysis\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in conditional double-mutant mice with quantitative skeletal phenotyping\",\n      \"pmids\": [\"30404864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Sclerostin-induced bone loss is partially dependent on LRP5 and fully dependent on Wnt1-class LRP6 signaling; Sost deficiency bone gain is blunted but not abolished in Lrp5−/− mice, and is completely reversed by selective blockade of Wnt1-class LRP6 activity.\",\n      \"method\": \"Sost−/−;Lrp5−/− double-knockout mice, LRP6-blocking monoclonal antibodies with Wnt-class selectivity, micro-CT and histomorphometry\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in double-KO combined with pharmacological antibody dissection, multiple skeletal phenotype readouts\",\n      \"pmids\": [\"23901037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LRP5 promotes tubulointerstitial fibrosis via a Wnt-independent mechanism: LRP5 directly co-immunoprecipitates with TGF-β receptors I and II through its extracellular domain, stabilizes TβRs at the membrane, enhances TGF-β1-induced TβR internalization, and activates Smad2/3 nuclear translocation.\",\n      \"method\": \"Lrp5 knockout in obstructive nephropathy mouse model, LRP5 overexpression in tubular epithelial cells, co-immunoprecipitation of LRP5–TβRI/II, Smad2/3 nuclear translocation assay\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct co-IP of LRP5 with TβRs plus domain-mapping plus in vivo KO with functional readout, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"32345960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LRP5 regulates lung microvascular and alveolar development by controlling Tie2 expression in endothelial cells; LRP5 knockdown decreases Tie2 levels and inhibits vascular/alveolar growth when Ang1 is dominant, while high LRP5 and Tie2 expression under Ang2-dominated conditions suppress angiogenesis.\",\n      \"method\": \"LRP5 siRNA knockdown in cultured endothelial cells and neonatal mouse lungs, Tie2 expression assay, in vivo hyperoxia and pneumonectomy models\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo knockdown with mechanistic pathway readout (Tie2 expression), single lab\",\n      \"pmids\": [\"22848540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Endothelium-derived LRP5 is both necessary and sufficient for retinal vascular development; endothelium-specific deletion of LRP5 (using Flk1-Cre) recapitulates the hypovascularization of Lrp5−/− retinas, and endothelial LRP5 restoration in Lrp5−/− mice rescues retinal vascular defects. Retinal vascularization depends on LRP5 in a dosage-dependent manner and does not depend on LRP6.\",\n      \"method\": \"Endothelium-specific Lrp5 conditional KO (Flk1-Cre), rescue by endothelial-specific LRP5 re-expression in global Lrp5−/− mice, retinal vascular phenotype analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus cell-type-specific rescue experiment, clear necessity and sufficiency demonstration\",\n      \"pmids\": [\"27031698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Lrp5 and Lrp6 are functionally redundant in intestinal epithelium; single-gene gut-specific knockouts (villin-Cre) are viable with normal intestines, but double Lrp5/Lrp6 gut-knockout pups die within 1 day of birth with absent proliferation, premature differentiation, and reduced cyclin D1 in intestinal epithelium.\",\n      \"method\": \"Villin-Cre conditional double-knockout mice, immunohistochemistry for proliferation/differentiation markers and cyclin D1\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in compound conditional KO with mechanistic Wnt target readout\",\n      \"pmids\": [\"21866564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"JAM3 directly associates with LRP5 to activate the PDK1/AKT pathway, which suppresses GSK3β and activates β-catenin/CCND1 signaling to maintain leukemia-initiating cell self-renewal; JAM3-LRP5 interaction is required for LIC maintenance but not normal HSC function.\",\n      \"method\": \"Co-immunoprecipitation of JAM3 with LRP5, JAM3 knockout in AML mouse model, serial transplantation, JAM3 knockdown in human leukemia cells, pathway component analysis (pAKT, GSK3β, β-catenin, CCND1)\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP binding demonstrated plus in vivo genetic KO phenotype with downstream pathway readouts, single lab\",\n      \"pmids\": [\"29584620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRP5 loss in macrophages reduces intracellular cholesterol ester accumulation (lipid uptake); LRP5 forms a complex with PCSK9 in lipid-loaded macrophages; in the absence of LRP5, PCSK9 release is reduced, implicating LRP5 in PCSK9 secretion from macrophages.\",\n      \"method\": \"LRP5 and PCSK9 siRNA silencing in primary human macrophages, cholesterol ester accumulation assay, co-immunoprecipitation of LRP5–PCSK9\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional silencing, single lab\",\n      \"pmids\": [\"32991689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"B7-1 activates podocyte β-catenin signaling through a B7-1–Hsp90ab1–LRP5 complex; Hsp90ab1 residue K69 is the key binding site for B7-1 transmission to LRP5/β-catenin; B7-1 is also a downstream target of β-catenin, forming a feedforward loop mediating podocyte injury.\",\n      \"method\": \"LC-MS/MS identification of Hsp90ab1, molecular docking and mutant analysis (K69 site), co-immunoprecipitation of B7-1–Hsp90ab1–LRP5 complex, B7-1 transgenic and adriamycin nephropathy mouse models, transcriptomic analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based binding partner identification confirmed by co-IP and mutagenesis, in vivo validation in two models, single lab\",\n      \"pmids\": [\"35710882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRP5 has a Wnt-independent role in glucose uptake in mammary epithelial cells; Lrp5 knockdown decreases glucose uptake, lactate secretion, and oxygen consumption and induces mitochondrial ROS accumulation and p38α activation; this function is not shared by LRP6.\",\n      \"method\": \"Lrp5 and Lrp6 shRNA knockdown in mammary epithelial cells, glucose uptake assay, lactate and oxygen consumption measurement, ROS and p38α activation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal metabolic assays with paralog comparison (LRP5 vs LRP6), clear Wnt-independence demonstrated\",\n      \"pmids\": [\"26711269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lrp5 is required for cranial neural crest cell (CNCC) migration in zebrafish; lrp5 knockdown and CRISPR/Cas9 editing do not impair CNCC induction but reduce proliferation of premigratory CNCCs and cause cells to cluster at ectopic positions, resulting in craniofacial skeleton malformations.\",\n      \"method\": \"Morpholino knockdown, transient CRISPR/Cas9 editing in zebrafish, in situ hybridization, cell migration tracking\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two loss-of-function approaches in zebrafish with quantitative cell-migration phenotype, single lab\",\n      \"pmids\": [\"26121341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Both Sp1 and KLF15 transcription factors bind to the LRP5 promoter region (−72 to −53 bp) and are required for its basal transcriptional activity, as demonstrated by chromatin immunoprecipitation and transactivation assays in Drosophila SL2 cells.\",\n      \"method\": \"Luciferase reporter deletion analysis, chromatin immunoprecipitation, transactivation in Drosophila SL2 cells (lacking endogenous Sp1/KLF)\",\n      \"journal\": \"BMC genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus heterologous transactivation assay, single lab, mechanistic promoter dissection\",\n      \"pmids\": [\"20141633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LRP5 regulates neonatal cardiomyocyte proliferation and heart regeneration via the AKT/P21 pathway: LRP5 deficiency accelerates AKT protein degradation, elevating the CDK inhibitor P21 and reducing cardiomyocyte proliferation; cardiac-specific Lrp5 deletion impairs neonatal cardiac regeneration after injury.\",\n      \"method\": \"Cardiac-specific Lrp5 conditional knockout mice, neonatal apex resection model, LRP5 overexpression, AKT/P21 pathway analysis by Western blot\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus OE with mechanistic pathway dissection, single lab\",\n      \"pmids\": [\"35429093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Selenoprotein P (SELENOP) directly interacts with LRP5/6 through protein-protein interactions and uses this interaction to augment canonical WNT signaling activity; disruption of SELENOP–LRP5/6 binding reduces WNT target gene expression in colorectal cancer organoids.\",\n      \"method\": \"Protein-protein interaction mapping, Selenop knockout in APC-deletion mouse adenoma model, organoid WNT signaling rescue, WNT target gene expression analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein interaction mapped plus in vivo and organoid functional validation, single lab\",\n      \"pmids\": [\"37166989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Anti-LRP5/6 VHH single-domain antibodies bind the third β-propeller (P3E3P4E4) region of LRP6 (and LRP5) with nanomolar affinity, sterically blocking Wnt3/3a binding; these VHHs strongly inhibit Wnt3/3a-induced β-catenin signaling and drive terminal differentiation of Wnt-hypersensitive Rnf43/Znrf3-mutant intestinal organoids.\",\n      \"method\": \"CIS display VHH selection, structural analysis of VHH–LRP5/6 interaction, luciferase Wnt reporter assay, intestinal organoid growth assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural characterization combined with functional organoid readout, mechanistic steric-block demonstrated\",\n      \"pmids\": [\"30664649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Co-deletion of Lrp5 and Lrp6 selectively in bone (Dmp1-Cre) nearly completely abrogates the bone-anabolic response to sclerostin monoclonal antibody, establishing that both LRP5 and LRP6 are required in osteoblast-lineage cells for sclerostin antibody action.\",\n      \"method\": \"Dmp1-Cre conditional Lrp5f/f;Lrp6f/f double-knockout mice, sclerostin mAb treatment, DXA, micro-CT, pQCT, bone histomorphometry\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional double-KO with pharmacological intervention, multiple skeletal phenotype readouts, direct mechanistic conclusion about receptor requirement\",\n      \"pmids\": [\"33164872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MDA PCa 2b prostate cancer cells induce new bone formation through Wnt canonical signaling and this effect requires the osteoblast Wnt co-receptor Lrp5; in calvaria from Lrp5−/− mice, MDA PCa 2b cells fail to induce bone formation. DKK1 blocks osteoblast proliferation and new bone formation by MDA PCa 2b cells.\",\n      \"method\": \"Co-culture of prostate cancer cells with primary mouse osteoblasts and Lrp5−/− bone organ cultures, DKK1 functional blocking experiment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic (Lrp5 KO organ culture) plus pharmacological (DKK1 block) evidence, single lab\",\n      \"pmids\": [\"17700537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Butyrate decreases LRP5 mRNA stability by elevating histone H3K9 acetylation of the ZFP36 locus, transcriptionally activating the RNA-binding protein ZFP36, which then binds AU-rich elements in LRP5 transcript and accelerates its decay, thereby blocking Wnt/β-catenin activation and cancer stemness.\",\n      \"method\": \"RNA-seq, HDAC inhibitor assays, H3K9 acetylation ChIP, ZFP36 overexpression/knockdown, LRP5 mRNA stability assay, syngeneic and orthotopic tumor models\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epigenetic and post-transcriptional mechanism defined by multiple molecular assays, single lab\",\n      \"pmids\": [\"40038255\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LRP5 is a single-pass transmembrane Wnt co-receptor that, upon Wnt ligand binding alongside Frizzled receptors, undergoes phosphorylation of its cytoplasmic PPPSPxS motifs (less efficiently than LRP6 due to a 'gap4' region), recruits Axin and Frat1 to the membrane, and thereby inhibits GSK3β-mediated β-catenin phosphorylation to activate canonical Wnt/β-catenin target gene transcription; its extracellular YWTD-EGF repeat domains are docking sites for inhibitors sclerostin and DKK1 (which bind non-competitively and independently), and high-bone-mass mutations in these domains reduce inhibitor binding to alter osteoblast-lineage Wnt output; beyond canonical Wnt signaling, LRP5 also operates via Wnt-independent mechanisms including gut serotonin suppression (via Tph1 inhibition), promotion of fatty acid β-oxidation in osteoblasts, regulation of glucose uptake in mammary epithelial cells, direct interaction with TGF-β receptors to activate Smad2/3 signaling in renal tubular fibrosis, and interaction with PCSK9 in macrophage lipid uptake.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LRP5 is a single-pass transmembrane LDL-receptor-family protein that functions as a Wnt co-receptor to activate canonical Wnt/\\u03b2-catenin signaling, a role central to bone accrual and tissue development [#0, #1]. Upon Wnt or Norrin engagement of a ternary complex with Frizzled receptors\\u2014to which LRP5 binds directly through its ectodomain [#7, #14]\\u2014its cytoplasmic PPPSPxS motifs are phosphorylated and recruit Frat1 and Axin to the membrane in a Dishevelled-dependent manner, sequestering Axin and inhibiting GSK3-mediated \\u03b2-catenin destruction [#5, #6]. LRP5 is phosphorylated less efficiently than its paralog LRP6 because of an intervening 'gap4' region, but phosphorylated LRP5 binds Axin directly without GSK3 as a bridge [#6]. Its extracellular YWTD-EGF \\u03b2-propeller repeats are docking sites for the secreted antagonists sclerostin and DKK1, which bind distinct repeats non-competitively; high-bone-mass (HBM) mutations such as G171V reduce inhibitor binding and Mesd-dependent surface trafficking to elevate osteoblast-lineage Wnt output [#2, #3, #4]. LRP5 acts redundantly with LRP6 in gastrulation, limb and intestinal development, but has paralog-selective functions including \\u03b2-catenin-driven fatty-acid \\u03b2-oxidation in osteoblasts and Wnt-independent control of glucose uptake [#9, #10, #22, #13, #26]. Beyond canonical Wnt signaling, LRP5 suppresses gut serotonin synthesis via Tph1 inhibition to promote bone formation [#11], directly binds TGF-\\u03b2 receptors to drive Smad2/3-dependent renal fibrosis [#19], and supports endothelial retinal vascularization [#21]. Loss-of-function LRP5 mutations underlie osteoporosis-pseudoglioma (OPPG), consistent with reduced bone formation and elevated serotonin in patients [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established LRP5 as a single-pass LDL-receptor-family transmembrane protein and asked which domain carried biological activity, localizing mitogenic function to the ectodomain.\",\n      \"evidence\": \"cDNA cloning from human osteoblasts and domain-deletion transfection with proliferation assay in NIH 3T3 cells\",\n      \"pmids\": [\"9790987\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the Wnt co-receptor function\", \"Mechanism of ectodomain mitogenic activity unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined LRP5 as a functional Wnt co-receptor required for bone accrual, connecting Wnt/\\u03b2-catenin signaling to skeletal biology.\",\n      \"evidence\": \"In situ expression, in vitro Wnt signaling assay, and dominant-negative LRP5 in mouse calvarial explants\",\n      \"pmids\": [\"11719191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling steps not yet mapped\", \"Did not address LRP6 redundancy\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved how LRP5 and LRP6 collaborate in vivo, showing genetic redundancy in gastrulation, limb, and bone development.\",\n      \"evidence\": \"Compound Lrp5/Lrp6 mutant mice with embryological staging, DXA, and micro-CT\",\n      \"pmids\": [\"15537447\", \"15142971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific division of labor between paralogs unresolved\", \"Molecular basis of differential signaling not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Explained the gain-of-function HBM G171V mutation by linking it to disrupted Mesd chaperone binding, reduced surface receptor, and DKK1-resistance dependent on the third YWTD repeat.\",\n      \"evidence\": \"Co-IP, surface biotinylation, domain mutagenesis, and paracrine vs autocrine Wnt reporter assays\",\n      \"pmids\": [\"15143163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not test all HBM mutants\", \"In vivo confirmation of autocrine paradigm lacking\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapped the cytoplasmic signaling output of LRP5, showing Frat1/Axin recruitment to the membrane and Dishevelled-dependent regulation upstream of GSK3 inhibition.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, dominant-negative Dishevelled, and TCF reporter assay\",\n      \"pmids\": [\"15699046\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of Frat1 vs Axin unclear\", \"Phosphorylation requirements not addressed here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified sclerostin as a direct YWTD-EGF-binding antagonist of LRP5, establishing a druggable extracellular regulatory node for bone.\",\n      \"evidence\": \"Co-IP/binding assays, domain-deletion mapping, and Wnt luciferase reporter with LRP5 overexpression rescue\",\n      \"pmids\": [\"15778503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship to DKK1 binding not yet defined\", \"Structural details of the interaction absent\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Clarified that DKK1 and sclerostin act independently and that HBM mutants resist both, explaining the molecular logic of inhibitor regulation.\",\n      \"evidence\": \"Co-IP competition assays and Wnt reporter assays with six HBM-LRP5 mutants\",\n      \"pmids\": [\"18521528\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding stoichiometry not quantified\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Proposed a Wnt-independent, gut-mediated mechanism for LRP5's bone effect through Tph1 suppression and serotonin signaling.\",\n      \"evidence\": \"Intestine-specific Lrp5 KO, microarray, serum serotonin in mice and OPPG patients, plus pharmacological rescue\",\n      \"pmids\": [\"20392224\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism debated by later studies\", \"Molecular link between LRP5 and Tph1 transcription unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Explained why LRP5 signals less robustly than LRP6 by attributing the difference to phosphorylation efficiency governed by a 'gap4' region, not Axin affinity.\",\n      \"evidence\": \"Chimeric domain swaps, in vitro phosphorylation, Axin co-IP, and Wnt reporter assays\",\n      \"pmids\": [\"21887268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinases responsible not fully defined\", \"In vivo relevance of gap4 untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided structural basis for ligand-induced ternary complex formation, showing Norrin bridges Fz4 and LRP5/6 via separate binding sites.\",\n      \"evidence\": \"X-ray crystallography, co-IP, and cell-based signaling with mutant Norrin\",\n      \"pmids\": [\"24186977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct LRP5-Norrin contacts not crystallographically resolved\", \"Conformational changes on LRP5 unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended the structural model showing Norrin mimics Wnt for Frizzled recognition and defined a GAG-binding interface across the complex.\",\n      \"evidence\": \"X-ray crystallography, SAXS, mutagenesis, and signaling assays\",\n      \"pmids\": [\"26158506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"LRP5/6 binding patch inferred, not co-crystallized\", \"Role of GAGs in vivo untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified paralog-selective and Wnt-independent disease roles, placing LRP5 upstream of TGF-\\u03b2 in pulmonary fibrosis.\",\n      \"evidence\": \"Lrp5 KO mice, bleomycin and adeno-TGF-\\u03b2 models, bone marrow transplantation, and \\u03b2-catenin inhibition\",\n      \"pmids\": [\"24921217\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-autonomous vs systemic contributions only partly dissected\", \"Direct molecular target downstream unresolved at this stage\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated paralog-specific metabolic functions, with LRP5 (not LRP6) driving \\u03b2-catenin-dependent fatty-acid oxidation in osteoblasts and Wnt-independent glucose uptake in mammary cells.\",\n      \"evidence\": \"Conditional Lrp5 KO and HBM knock-in mice with metabolic phenotyping; shRNA knockdown with metabolic and ROS assays\",\n      \"pmids\": [\"25802278\", \"26711269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of LRP5/LRP6 functional divergence unclear\", \"Direct effectors of glucose-uptake function unidentified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed that direct LRP5/6-Frizzled binding restrains non-canonical Wnt signaling and suppresses tumor cell migration.\",\n      \"evidence\": \"Co-IP, recombinant LRP6 ectodomain rescue, migration assays, and in vivo metastasis model\",\n      \"pmids\": [\"25902418\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LRP5-specific contribution not isolated from LRP6\", \"Mechanism of non-canonical suppression incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established endothelial LRP5 as necessary and sufficient for retinal vascular development in an LRP6-independent manner.\",\n      \"evidence\": \"Endothelium-specific Lrp5 KO (Flk1-Cre) and endothelial LRP5 re-expression rescue in global KO mice\",\n      \"pmids\": [\"27031698\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream endothelial Wnt targets not fully mapped\", \"Ligand driving this signaling not defined here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Refined the bone signaling model by genetically dissociating Wnt1 anabolism and sclerostin action from sole LRP5 dependence.\",\n      \"evidence\": \"Conditional Wnt1-overexpression x Lrp5 KO and Sost x Lrp5 double-KO mice with LRP6-blocking antibodies\",\n      \"pmids\": [\"30404864\", \"23901037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative LRP5 vs LRP6 contributions context-dependent\", \"Mechanism of partial LRP5 dependence unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Uncovered ligand-independent and cancer-associated LRP5 activation modes via FZD oligomerization and a JAM3-LRP5-PDK1/AKT axis sustaining leukemia-initiating cells.\",\n      \"evidence\": \"Co-IP of FZD-LRP5/6 with dominant negatives and reporter in HepG2; JAM3-LRP5 co-IP with AML KO models and pathway readouts\",\n      \"pmids\": [\"30361437\", \"29584620\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological triggers of ligand-independent oligomerization unclear\", \"Direct JAM3-LRP5 binding interface unmapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a Wnt-independent profibrotic mechanism whereby LRP5 directly binds and stabilizes TGF-\\u03b2 receptors to activate Smad2/3 in kidney.\",\n      \"evidence\": \"Lrp5 KO obstructive nephropathy, tubular LRP5 overexpression, LRP5-T\\u03b2RI/II co-IP, and Smad2/3 translocation assays\",\n      \"pmids\": [\"32345960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain-level T\\u03b2R binding site not finely mapped\", \"Cross-talk with canonical Wnt in fibrosis unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified additional non-Wnt LRP5 partnerships, including a B7-1-Hsp90ab1-LRP5 complex in podocyte injury and AKT/P21-mediated cardiomyocyte proliferation.\",\n      \"evidence\": \"LC-MS/MS, docking/mutagenesis, co-IP, and disease mouse models for podocytes; cardiac-specific KO with AKT/P21 analysis\",\n      \"pmids\": [\"35710882\", \"35429093\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of these complexes beyond disease models unclear\", \"Single-lab observations\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated that SELENOP directly binds LRP5/6 to augment canonical Wnt signaling in colorectal cancer.\",\n      \"evidence\": \"Protein interaction mapping, Selenop KO adenoma model, and organoid Wnt rescue\",\n      \"pmids\": [\"37166989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding interface and stoichiometry undefined\", \"LRP5 vs LRP6 selectivity not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided targetable structural insight by showing VHH antibodies block Wnt3/3a binding at the LRP5/6 third \\u03b2-propeller to inhibit \\u03b2-catenin signaling.\",\n      \"evidence\": \"VHH selection, structural analysis, Wnt reporter, and Rnf43/Znrf3-mutant organoid differentiation\",\n      \"pmids\": [\"30664649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"LRP5-specific affinity vs LRP6 not separated\", \"In vivo efficacy not addressed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined post-transcriptional control of LRP5 abundance by butyrate-driven ZFP36-mediated mRNA decay to limit Wnt-dependent cancer stemness.\",\n      \"evidence\": \"RNA-seq, H3K9ac ChIP, ZFP36 manipulation, mRNA stability assays, and tumor models\",\n      \"pmids\": [\"40038255\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality across tissues untested\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LRP5 achieves its many paralog-selective and Wnt-independent functions through a single ectodomain/cytoplasmic architecture, and what distinguishes LRP5 from LRP6 mechanistically across tissues, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural explanation for LRP5 vs LRP6 functional divergence\", \"Direct effectors of several Wnt-independent functions unidentified\", \"In vivo relevance of ligand-independent oligomerization unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 7, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 3, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5, 15, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 10, 21, 22]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [16, 19, 23]}\n    ],\n    \"complexes\": [\n      \"Wnt signalosome (FZD\\u2013LRP5/6\\u2013Dishevelled)\",\n      \"Norrin\\u2013Fz4\\u2013LRP5 ternary complex\",\n      \"B7-1\\u2013Hsp90ab1\\u2013LRP5 complex\"\n    ],\n    \"partners\": [\n      \"FZD4\",\n      \"Axin\",\n      \"Frat1\",\n      \"Dishevelled\",\n      \"DKK1\",\n      \"SOST\",\n      \"TGFBR1\",\n      \"PCSK9\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}