{"gene":"LBP","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2016,"finding":"LBP binds longitudinally to LPS micelles and catalyzes multi-round transfer of LPS molecules to CD14 via electrostatic interactions; CD14 then transfers a single LPS molecule to TLR4-MD2 in a TLR4-dependent manner. Intermediate complexes (LBP-LPS micelles, CD14-LBP-LPS micelle, CD14-LPS-TLR4-MD2) were directly visualized and the entire cascade reconstituted in vitro.","method":"In vitro reconstitution of entire LPS transfer cascade, negative-stain electron microscopy, single-molecule TIRF fluorescence analysis, structural characterization of intermediate complexes","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 / Strong — full reconstitution in vitro, EM structural characterization of intermediates, single-molecule analysis, multiple orthogonal methods in one rigorous study","pmids":["27986454"],"is_preprint":false},{"year":2003,"finding":"LBP forms complexes with lipoteichoic acid (LTA) from S. pneumoniae and S. aureus and catalytically transfers LTA to CD14, enabling TLR2-dependent immune cell activation; TLR4 and MD-2 are not involved in LTA recognition.","method":"Native gel electrophoresis (PhastGel) to verify LTA-LBP and LBP-sCD14 complex formation and catalytic transfer; HEK293/CD14 and CHO cell transfection with TLR2, TLR4, MD-2","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct demonstration of complex formation and catalytic transfer by native gel, cell-based functional assays with transfection, negative result for TLR4/MD-2 rigorously established","pmids":["12594207"],"is_preprint":false},{"year":2013,"finding":"LBP (and sCD14) independently deliver triacylated lipoproteins to TLR1-TLR2, enhancing ternary complex formation between TLR1, TLR2, and triacylated lipopeptide agonist, without remaining physically associated with the final complex. Either protein alone suffices to sensitize TLR-expressing cells to nanogram levels of lipopeptide.","method":"Size exclusion chromatography to measure ternary complex formation with soluble extracellular TLR1/TLR2 domains; cell activation assays with synthetic lipopeptide (Pam3CSK4) and natural lipoprotein OspA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted in vitro with purified recombinant proteins, two orthogonal methods (SEC + cell activation), replicated with two distinct agonists","pmids":["23430250"],"is_preprint":false},{"year":2004,"finding":"In human coronary artery endothelial cells, LBP enables LPS uptake and delivery to intracellularly located TLR4-MD2 via a scavenger receptor pathway, facilitating cell activation at low LPS concentrations. LPS internalization—dependent on LBP—is required for cell activation because TLR4 functions intracellularly in these cells.","method":"FACS, confocal microscopy, RT-PCR, functional cytokine assays; LBP-dependent LPS uptake demonstrated in HCAEC","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (FACS, confocal, functional assay) in single lab; mechanistic pathway placement established but not independently replicated","pmids":["15132988"],"is_preprint":false},{"year":2016,"finding":"LBP is constitutively present on the surface and in the cytoplasm of monocytes/macrophages; it is internalized in a concentration-dependent manner that is enhanced by LPS. LBP internalization does not depend on CD14 or TLR4/MD-2 but colocalizes with LPS at the cytoplasmic membrane and in intracellular compartments. LBP also facilitates IL-1β production by macrophages in the absence of ATP and is found near activated caspases during inflammasome activation, indicating a role in intracellular LPS transport and signaling beyond its extracellular shuttle function.","method":"Flow cytometry, fluorescence quenching, confocal microscopy, membrane fractionation (Triton X-100 solubilization), HEK293 and macrophage cell lines with CD14/TLR4 knockouts, IL-1β ELISA","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (FACS, confocal, fractionation, functional assay), single lab; intracellular colocalization with LPS and inflammasome proximity established","pmids":["26804480"],"is_preprint":false},{"year":1999,"finding":"Blocking either LBP-LPS binding (class 1 mAbs) or LPS/LBP-to-CD14 presentation (class 2 mAbs) suppresses LPS-induced TNF production and protects mice from lethal endotoxemia, establishing LBP's critical sequential roles: first binding LPS, then presenting the LPS/LBP complex to CD14.","method":"Generation of rat monoclonal antibodies to murine LBP; in vivo endotoxemia mouse model measuring TNF and survival","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo functional epistasis with antibody classes distinguishing two mechanistic steps; single lab but two distinct antibody classes used orthogonally","pmids":["10358200"],"is_preprint":false},{"year":2001,"finding":"LBP intercalates in a directed transmembrane orientation into negatively charged lipid bilayers; anti-LBP antibodies bind LBP on both sides of the bilayer after addition to only one side, indicating transmembrane configuration. Pre-formed LPS-LBP complexes in solution do NOT insert into membranes, suggesting that membrane-bound LBP captures aggregated endotoxin directly.","method":"Planar lipid bilayer electrical measurements (membrane current, potential, capacitance); antibody binding assays on reconstituted membranes","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — reconstituted planar membrane system with rigorous electrical measurements, single lab, single method type","pmids":["11347890"],"is_preprint":false},{"year":2003,"finding":"Membrane-bound LBP (mLBP) is incorporated as a transmembrane protein in the cytoplasmic membrane of human mononuclear cells and mediates binding of aggregated endotoxin and its transfer to transmembrane signaling proteins (TLR4, MaxiK channel). Fluorescence resonance energy transfer spectroscopy showed that endotoxin aggregates are intercalated into reconstituted membranes by mLBP. Soluble LBP complexed with LPS in serum prior to membrane contact neutralizes LPS rather than activating cells.","method":"Patch-clamp on excised outside-out cytoplasmic membrane patches; FRET spectroscopy; RT-PCR; cytokine assays","journal":"Journal of endotoxin research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (patch-clamp, FRET, RT-PCR, cell assays); single lab; distinguishes soluble vs. membrane-bound LBP functions","pmids":["12831460"],"is_preprint":false},{"year":2007,"finding":"LBP is required for LPS-induced disruption of tight junctions in cholangiocyte monolayers. siRNA knockdown of LBP attenuates LPS-induced paracellular permeability increase and redistribution of tight junction proteins (ZO-1, occludin, claudins), placing LBP upstream of c-Src and TLR4 in the signaling pathway mediating barrier disruption.","method":"siRNA knockdown of LBP (and TLR4, c-Src); paracellular permeability assays; immunofluorescence of tight junction proteins; Western blot for phosphorylation; myosin light chain kinase inhibitor (ML-7) experiments","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function (siRNA) with specific permeability and protein redistribution readouts, multiple inhibitors, single lab","pmids":["17446308"],"is_preprint":false},{"year":1997,"finding":"The LBP gene promoter contains recognition elements typical of acute-phase reactants, and STAT-3 binding to a conserved acute-phase motif is essential for LBP promoter activation. Transcriptional activation involves AP-1 and C/EBPβ transcription factors, as shown by reporter-gene and EMSA assays. LBP mRNA induction occurs via both transcriptional and post-transcriptional mechanisms.","method":"Nuclear run-on, RNA half-life experiments, 5' flanking region cloning, luciferase reporter-gene assays with promoter mutation variants, EMSA for AP-1 and C/EBPβ","journal":"Cytokines, cellular & molecular therapy / Immunobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple complementary promoter analysis methods (nuclear run-on, reporter gene, EMSA, mutagenesis) in single lab","pmids":["9287245","9442384"],"is_preprint":false},{"year":2014,"finding":"LBP gene expression in macrophages is specifically induced by LXR activation (by oxysterols or modified LDL loading) in a cell-type-specific manner (macrophages but not liver). Bone marrow transplant studies in LBP-/- mice showed markedly smaller atherosclerotic lesions and increased macrophage apoptosis in lesions. LBP promotes macrophage survival under cholesterol loading without affecting cholesterol efflux.","method":"Bone marrow transplantation with LBP-/- donors into irradiated recipients; Western diet feeding; lesion area quantification; TUNEL staining; in vitro macrophage cholesterol loading assays; LXR agonist treatment","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo bone marrow transplant epistasis plus in vitro mechanistic follow-up; single lab; multiple readouts","pmids":["24671012"],"is_preprint":false},{"year":2020,"finding":"Hepatic LBP expression is induced by the gut microbiota through MYD88-dependent signaling. LBP potentiates LPS-mediated impairment of insulin signaling in hepatocytes in the presence of low LPS concentrations; this effect is abolished by the LBP-blocking peptide LBPK95A. Systemic blockade of LBP by LBPK95A and CRISPR-Cas9-mediated hepatic Lbp knockdown both improve systemic glucose homeostasis in mice.","method":"Liver transcriptomics of germ-free vs. conventionally raised Myd88 KO and WT mice; primary hepatocyte LPS/LBP insulin signaling assays; LBPK95A blocking peptide treatment in vivo; CRISPR-Cas9 hepatic Lbp knockdown; glucose tolerance tests","journal":"Molecular metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal in vivo approaches (germ-free model, CRISPR knockdown, pharmacological blockade) plus in vitro mechanistic validation; single lab","pmids":["32305515"],"is_preprint":false},{"year":2023,"finding":"Gastric cancer-derived LBP activates the TLR4/NF-κB pathway in intrahepatic macrophages to promote TGF-β1 secretion, which in turn activates hepatic stellate cells to form a fibrotic pre-metastatic niche. TGF-β1 also enhances migration and invasion of incoming metastatic gastric cancer cells. Co-immunoprecipitation confirmed LBP interaction with macrophage TLR4 signaling components.","method":"DIA mass spectrometry; Co-IP; mRNA sequencing of THP-1 macrophages ± LBP; Transwell migration/invasion assays; intrasplenic injection mouse LM model; IF, WB, IHC; galunisertib (TGF-β/Smad inhibitor) treatment in vivo","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including Co-IP, mRNA-seq, in vivo model with pharmacological intervention; single lab","pmids":["37789385"],"is_preprint":false},{"year":2024,"finding":"LBP deficiency aggravates high-fat diet-induced NAFLD in rats through an epigenetic mechanism: loss of LBP leads to altered H3K27 acetylation at active enhancers, activating C/EBPβ as a key transcription factor, which in turn drives SCD (stearoyl-CoA desaturase) expression and dysregulated lipid metabolism.","method":"LBP-/- rat model with HFD; H3K27ac ChIP-seq; transcriptomic sequencing; integrative enhancer-target gene analysis; qRT-PCR and Western blot for C/EBPβ, SCD, NF-κB, Nrf2","journal":"Zoological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO model with ChIP-seq and transcriptomics integration plus mechanistic validation; single lab","pmids":["38114435"],"is_preprint":false},{"year":1998,"finding":"LBP binds to double-stranded DNA and, through association with core histones H2A, H2B, and H4 (but not H3), gains tighter chromatin-binding. GST-fusion pulldown with recombinant histones established direct interaction of LBP-p40 (laminin binding protein precursor p40, a distinct protein sharing the LBP abbreviation) with these specific histones. NOTE: This paper concerns the 37/67-kDa laminin-binding protein precursor (RPSA locus), not the LPS-binding protein LBP gene; it is a symbol collision.","method":"DNA cellulose column chromatography; GST-histone pulldown","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"EXCLUDED — symbol collision; LBP-p40 is the laminin receptor/RPSA precursor, not the LPS-binding protein encoded by the LBP (BPIFD2) gene queried","pmids":["9878528"],"is_preprint":false},{"year":1998,"finding":"LBP is required for control of low-dose (100 CFU) S. typhimurium infection in vivo; LBP-deficient mice fail to control this infection, demonstrating that LBP is essential for innate defense against Gram-negative bacteria at physiologically relevant bacterial doses.","method":"LBP-knockout mouse model; in vivo infection with S. typhimurium at low inoculum; survival and bacterial burden readouts","journal":"Journal of endotoxin research (cited in review)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined infection phenotype; reported in review (PMID:10725789) referencing primary LBP-/- work; single lab","pmids":["10725789"],"is_preprint":false},{"year":2003,"finding":"In septic patient plasma, LPS bound transiently to monocytes is released into plasma lipoproteins; this release is enhanced by sCD14. LBP also inhibited LPS responses after LPS had bound to monocytes, but without requiring extensive release of cell-bound LPS (unlike sCD14). During sepsis, HDL remained the dominant LPS acceptor; in some patients, LPS transfer shifted to an acute-phase VLDL fraction.","method":"In vitro experiments with undiluted human septic serum; LPS binding/transfer assays with monocytes and isolated lipoproteins; cytokine response assays","journal":"Journal of endotoxin research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays in undiluted human serum with mechanistic dissection of LBP vs. sCD14 roles; single lab","pmids":["12803885"],"is_preprint":false},{"year":2003,"finding":"A 170-kDa cysteine metalloprotease from Prevotella intermedia cleaves both CD14 and LBP in a concentration-dependent manner, thereby reducing IL-1β mRNA expression in LPS-activated macrophages. Addition of soluble CD14 abrogated protease-mediated inhibition, placing LBP/CD14 cleavage as the mechanism of immune evasion.","method":"Zymographic analysis; molecular mass determination; class-specific protease inhibitors/activators; RT-PCR for IL-1β mRNA in U937 and THP-1 cells; sCD14 rescue experiment","journal":"Archives of microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical identification of protease plus functional consequence on macrophage activation; single lab, multiple methods","pmids":["12728301"],"is_preprint":false},{"year":1998,"finding":"LBP is expressed locally in lung, kidney, and liver, and LBP and CD14 mRNAs are co-induced in all three organs following cecal ligation and puncture (CLP)-induced peritonitis in mice, with kinetics paralleling local IL-1 mRNA induction. This local co-induction may sensitize these organs to secondary LPS challenge.","method":"Northern blot analysis; TaqMan fluorescent quantitative RT-PCR; CLP mouse model with serial tissue harvest","journal":"The Journal of surgical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative mRNA analysis across multiple organs with defined in vivo model; single lab","pmids":["9695742"],"is_preprint":false},{"year":1997,"finding":"The LBP gene contains 14–15 exons spanning ~28.5 kb, with a 2-kb promoter containing acute-phase response elements. The LPS-binding motif is encoded in exons 3 and 4. Genomic organization is highly conserved with PLTP (and BPI), indicating a common ancestral lipid-binding gene family, with a shared C-terminal octapeptide important for anchoring in lipoprotein particles.","method":"Genomic DNA sequencing and exon-intron organization mapping; sequence comparison with PLTP, CETP, BPI","journal":"Genomics / Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genomic structural analysis providing functional domain annotation; two independent labs confirming similar organization","pmids":["9441745","9240454"],"is_preprint":false}],"current_model":"LBP is a liver-derived acute-phase glycoprotein that binds longitudinally to LPS micelles and catalytically transfers individual LPS molecules first to CD14—via rapid electrostatic binding/unbinding cycles—and then, in a TLR4-dependent step, from CD14 to the TLR4-MD2 signaling complex; it similarly facilitates delivery of lipoteichoic acid and triacylated lipoproteins to TLR2-subfamily receptors. Beyond this extracellular shuttle role, LBP is internalized by macrophages, co-localizes with LPS in intracellular compartments independently of CD14/TLR4, and can intercalate as a transmembrane protein into cell membranes to transfer aggregated endotoxin to membrane-resident signaling proteins (TLR4, MaxiK channel). LBP expression is transcriptionally activated by IL-6 and IL-1β through STAT-3, AP-1, and C/EBPβ binding sites in its promoter, and in macrophages its expression is additionally controlled by LXR-dependent oxysterol/cholesterol loading. Functionally, LBP promotes macrophage survival under cholesterol load, facilitates intrahepatic macrophage TLR4/NF-κB-TGF-β1 signaling to form pre-metastatic niches, potentiates LPS inhibition of hepatocyte insulin signaling downstream of gut microbiota-MYD88 signaling, and epigenetically regulates lipid metabolism through H3K27ac-C/EBPβ-SCD in the liver when absent."},"narrative":{"mechanistic_narrative":"LBP is a liver-derived acute-phase glycoprotein that serves as the apical sensor and shuttle of the LPS-recognition cascade, catalytically extracting individual endotoxin molecules from bacterial membranes and micelles and delivering them to downstream receptors [PMID:27986454]. It binds longitudinally to LPS micelles and transfers LPS molecules to CD14 through repeated electrostatic binding/unbinding cycles, after which CD14 hands a single LPS molecule to the TLR4-MD2 signaling complex in a TLR4-dependent step; the full cascade and its intermediate complexes have been reconstituted and visualized in vitro [PMID:27986454]. This catalytic transfer activity extends to other microbial ligands: LBP forms complexes with lipoteichoic acid and delivers it to CD14 for TLR2-dependent activation independently of TLR4/MD-2 [PMID:12594207], and it delivers triacylated lipoproteins to TLR1-TLR2 without remaining bound to the final ternary complex [PMID:23430250]. Antibody-blocking and knockout studies establish that these sequential binding and presentation steps are required for LPS-induced TNF production and host defense against Gram-negative bacteria in vivo [PMID:10358200, PMID:10725789]. Beyond its extracellular shuttle role, LBP is internalized by monocytes/macrophages independently of CD14 or TLR4, colocalizes with LPS in intracellular compartments, and associates with inflammasome machinery, and it can intercalate as a transmembrane protein into negatively charged bilayers to capture aggregated endotoxin and deliver it to membrane-resident signaling proteins including TLR4 and the MaxiK channel [PMID:26804480, PMID:11347890, PMID:12831460]. LBP transcription is driven by acute-phase signaling through STAT-3, AP-1, and C/EBPβ promoter elements [PMID:9287245, PMID:9442384], and in macrophages it is additionally induced by LXR-dependent cholesterol/oxysterol loading, where it promotes macrophage survival under cholesterol load [PMID:24671012]. In disease contexts, gut microbiota-MYD88-induced hepatic LBP potentiates LPS-mediated impairment of hepatocyte insulin signaling and worsens systemic glucose homeostasis [PMID:32305515], tumor-derived LBP drives intrahepatic macrophage TLR4/NF-κB-TGF-β1 signaling to build a pre-metastatic niche [PMID:37789385], and LBP deficiency aggravates fatty liver disease through H3K27ac-C/EBPβ-SCD epigenetic dysregulation of lipid metabolism [PMID:38114435].","teleology":[{"year":1997,"claim":"Established how LBP expression is wired into the acute-phase response, explaining its induction during infection.","evidence":"Promoter cloning, luciferase reporters, EMSA and nuclear run-on identifying STAT-3, AP-1, C/EBPβ elements; genomic organization and family relationship to PLTP/BPI","pmids":["9287245","9442384","9441745","9240454"],"confidence":"Medium","gaps":["Does not establish the relative contribution of each transcription factor in vivo","Cell-type-specific promoter usage not resolved"]},{"year":1998,"claim":"Demonstrated that LBP is essential for innate defense, not merely a serum amplifier, by showing knockout mice fail to control low-dose Gram-negative infection.","evidence":"LBP-knockout mouse infected with low-inoculum S. typhimurium; local co-induction of LBP/CD14 mRNA across lung, kidney, liver in CLP peritonitis model","pmids":["10725789","9695742"],"confidence":"Medium","gaps":["Primary KO infection data reported through a review","Local extrahepatic LBP function not mechanistically dissected"]},{"year":1999,"claim":"Resolved that LBP acts in two separable sequential steps in vivo—LPS binding then presentation to CD14—by selectively blocking each with antibody classes.","evidence":"Class 1 and class 2 anti-LBP monoclonal antibodies in a lethal endotoxemia mouse model measuring TNF and survival","pmids":["10358200"],"confidence":"Medium","gaps":["Antibody epitope mapping to structural domains not provided","Single lab"]},{"year":2001,"claim":"Revealed a non-shuttle mode in which LBP itself inserts into membranes as a transmembrane protein, distinguishing membrane-bound from soluble functions.","evidence":"Planar lipid bilayer electrical measurements and two-sided antibody binding on reconstituted negatively charged membranes","pmids":["11347890"],"confidence":"Medium","gaps":["Single method type, single lab","Structural basis of transmembrane orientation unknown"]},{"year":2003,"claim":"Extended LBP's catalytic transfer activity beyond LPS to Gram-positive and lipoprotein ligands, and defined the membrane-bound LBP route to TLR4 and MaxiK.","evidence":"Native gel transfer assays for LTA-CD14; patch-clamp and FRET for membrane-bound LBP delivering aggregated endotoxin; septic serum lipoprotein transfer assays; identification of a P. intermedia protease cleaving LBP/CD14","pmids":["12594207","12831460","12803885","12728301"],"confidence":"Medium","gaps":["Soluble vs membrane-bound LBP balance in vivo unresolved","TLR2-subfamily handoff structure not characterized"]},{"year":2004,"claim":"Showed LBP enables intracellular TLR4 signaling in non-myeloid cells by driving scavenger-receptor-mediated LPS uptake.","evidence":"FACS, confocal microscopy and cytokine assays in human coronary artery endothelial cells","pmids":["15132988"],"confidence":"Medium","gaps":["Specific scavenger receptor not identified","Not independently replicated"]},{"year":2013,"claim":"Demonstrated LBP and sCD14 each independently sensitize cells to triacylated lipoproteins via TLR1-TLR2 ternary complex formation, generalizing the catalytic-handoff model.","evidence":"Size exclusion chromatography with soluble TLR1/TLR2 domains and cell activation with Pam3CSK4 and OspA","pmids":["23430250"],"confidence":"High","gaps":["Quantitative kinetics of transfer not measured","In vivo relevance for lipoprotein sensing not tested"]},{"year":2014,"claim":"Linked LBP to sterol metabolism, showing macrophage LBP is LXR-induced and promotes macrophage survival under cholesterol load with consequences for atherosclerosis.","evidence":"LBP-/- bone marrow transplant into irradiated mice on Western diet; lesion quantification, TUNEL, in vitro cholesterol loading, LXR agonist treatment","pmids":["24671012"],"confidence":"Medium","gaps":["Molecular pathway linking LBP to survival not defined","Cholesterol efflux unaffected, leaving mechanism open"]},{"year":2016,"claim":"Achieved a full structural/mechanistic reconstitution of the LPS transfer cascade and uncovered an intracellular CD14/TLR4-independent LBP pool near the inflammasome.","evidence":"In vitro reconstitution, negative-stain EM and single-molecule TIRF of intermediate complexes; flow cytometry, fractionation, confocal and IL-1β assays in CD14/TLR4-knockout macrophages","pmids":["27986454","26804480"],"confidence":"High","gaps":["Intracellular LBP trafficking route and inflammasome mechanism not defined","How transmembrane vs catalytic shuttle modes are selected in cells unknown"]},{"year":2020,"claim":"Connected gut microbiota signaling to hepatic LBP and metabolic disease, showing LBP potentiates LPS-driven hepatic insulin resistance.","evidence":"Germ-free vs conventional Myd88 KO transcriptomics; primary hepatocyte insulin signaling assays; LBPK95A blocking peptide and CRISPR hepatic Lbp knockdown with glucose tolerance tests","pmids":["32305515"],"confidence":"Medium","gaps":["Downstream insulin signaling node not pinpointed","Single lab"]},{"year":2023,"claim":"Identified a tumor-promoting axis in which tumor-derived LBP engages intrahepatic macrophage TLR4/NF-κB-TGF-β1 signaling to build a pre-metastatic niche.","evidence":"DIA mass spectrometry, Co-IP, mRNA-seq of THP-1 macrophages, Transwell assays, intrasplenic metastasis mouse model with galunisertib","pmids":["37789385"],"confidence":"Medium","gaps":["Direct LBP-TLR4 binding interface not structurally defined","Single lab"]},{"year":2024,"claim":"Revealed an unexpected protective hepatic role of LBP via epigenetic control of lipid metabolism, with deficiency worsening fatty liver disease.","evidence":"LBP-/- rat HFD model; H3K27ac ChIP-seq and transcriptomics integration identifying C/EBPβ-SCD axis; qRT-PCR/WB validation","pmids":["38114435"],"confidence":"Medium","gaps":["Mechanism by which LBP loss alters H3K27ac is unclear","Rat-to-human translation untested"]},{"year":null,"claim":"How LBP partitions between its extracellular catalytic shuttle, transmembrane-insertion, and intracellular trafficking modes—and what governs its switch between immune sensing and metabolic/epigenetic functions—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling soluble shuttle, membrane-bound, and intracellular LBP roles","Structural basis of transmembrane insertion vs catalytic transfer unknown","Intracellular LBP-inflammasome mechanism uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,1,2,6,7]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,5]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,5,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,6,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,2,5,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,11,12]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[10,11,13]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,12,13]}],"complexes":[],"partners":["CD14","TLR4","MD2","TLR2","TLR1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P18428","full_name":"Lipopolysaccharide-binding protein","aliases":[],"length_aa":481,"mass_kda":53.4,"function":"Plays a role in the innate immune response. Binds to the lipid A moiety of bacterial lipopolysaccharides (LPS), a glycolipid present in the outer membrane of all Gram-negative bacteria (PubMed:24120359, PubMed:7517398). Acts as an affinity enhancer for CD14, facilitating its association with LPS. Promotes the release of cytokines in response to bacterial lipopolysaccharide (PubMed:24120359, PubMed:7517398)","subcellular_location":"Secreted; Cytoplasmic granule membrane","url":"https://www.uniprot.org/uniprotkb/P18428/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LBP","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LBP","total_profiled":1310},"omim":[{"mim_id":"617074","title":"SMITH-MAGENIS SYNDROME CHROMOSOME REGION, CANDIDATE GENE 8; SMCR8","url":"https://www.omim.org/entry/617074"},{"mim_id":"614110","title":"BPI FOLD-CONTAINING PROTEIN, FAMILY B, MEMBER 6; BPIFB6","url":"https://www.omim.org/entry/614110"},{"mim_id":"614109","title":"BPI FOLD-CONTAINING PROTEIN, FAMILY C; BPIFC","url":"https://www.omim.org/entry/614109"},{"mim_id":"614108","title":"BPI FOLD-CONTAINING PROTEIN, FAMILY B, MEMBER 2; BPIFB2","url":"https://www.omim.org/entry/614108"},{"mim_id":"609786","title":"GRAINYHEAD-LIKE 1; GRHL1","url":"https://www.omim.org/entry/609786"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in 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and evidences of specialization in mollusks.","date":"2015","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26608112","citation_count":23,"is_preprint":false},{"pmid":"14577844","id":"PMC_14577844","title":"Inhibition of LPS-responses by synthetic peptides derived from LBP associates with the ability of the peptides to block LBP-LPS interaction.","date":"2003","source":"Journal of endotoxin research","url":"https://pubmed.ncbi.nlm.nih.gov/14577844","citation_count":23,"is_preprint":false},{"pmid":"23742867","id":"PMC_23742867","title":"Identification and expression analysis on bactericidal permeability-increasing protein (BPI)/lipopolysaccharide-binding protein (LBP) of ark shell, Scapharca broughtonii.","date":"2013","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/23742867","citation_count":22,"is_preprint":false},{"pmid":"26297397","id":"PMC_26297397","title":"LBP/BPI homologue in Eisenia andrei earthworms.","date":"2015","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26297397","citation_count":22,"is_preprint":false},{"pmid":"19707138","id":"PMC_19707138","title":"A common haplotype of the LBP gene predisposes to severe sepsis.","date":"2009","source":"Critical care medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19707138","citation_count":22,"is_preprint":false},{"pmid":"15471945","id":"PMC_15471945","title":"LBP proteins modulate SF1-independent expression of P450scc in human placental JEG-3 cells.","date":"2004","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/15471945","citation_count":21,"is_preprint":false},{"pmid":"17442589","id":"PMC_17442589","title":"mRNA expression patterns of the BPI/LBP molecule in the Atlantic cod (Gadus morhua L.).","date":"2006","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17442589","citation_count":21,"is_preprint":false},{"pmid":"12728301","id":"PMC_12728301","title":"Cleavage of CD14 and LBP by a protease from Prevotella intermedia.","date":"2003","source":"Archives of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/12728301","citation_count":19,"is_preprint":false},{"pmid":"32305515","id":"PMC_32305515","title":"Hepatic expression of lipopolysaccharide-binding protein (Lbp) is induced by the gut microbiota through Myd88 and impairs glucose tolerance in mice independent of obesity.","date":"2020","source":"Molecular metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/32305515","citation_count":19,"is_preprint":false},{"pmid":"9144073","id":"PMC_9144073","title":"Reactivity of murine and human recombinant LPS-binding protein (LBP) within LPS and gram negative bacteria.","date":"1995","source":"Journal of 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Subjects on Antiretroviral Therapy.","date":"2016","source":"Pathogens & immunity","url":"https://pubmed.ncbi.nlm.nih.gov/27500282","citation_count":17,"is_preprint":false},{"pmid":"37436939","id":"PMC_37436939","title":"Effect of time restricted feeding on anthropometric measures, eating behavior, stress, serum levels of BDNF and LBP in overweight/obese women with food addiction: a randomized clinical trial.","date":"2023","source":"Nutritional neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/37436939","citation_count":17,"is_preprint":false},{"pmid":"38114435","id":"PMC_38114435","title":"Loss of LBP triggers lipid metabolic disorder through H3K27 acetylation-mediated C/EBPβ- SCD activation in non-alcoholic fatty liver disease.","date":"2024","source":"Zoological research","url":"https://pubmed.ncbi.nlm.nih.gov/38114435","citation_count":16,"is_preprint":false},{"pmid":"9575548","id":"PMC_9575548","title":"Roles for LBP and soluble CD14 in cellular uptake of LPS.","date":"1998","source":"Progress in clinical and biological research","url":"https://pubmed.ncbi.nlm.nih.gov/9575548","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49334,"output_tokens":5791,"usd":0.117433,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14379,"output_tokens":4414,"usd":0.091122,"stage2_stop_reason":"end_turn"},"total_usd":0.208555,"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\": 2016,\n      \"finding\": \"LBP binds longitudinally to LPS micelles and catalyzes multi-round transfer of LPS molecules to CD14 via electrostatic interactions; CD14 then transfers a single LPS molecule to TLR4-MD2 in a TLR4-dependent manner. Intermediate complexes (LBP-LPS micelles, CD14-LBP-LPS micelle, CD14-LPS-TLR4-MD2) were directly visualized and the entire cascade reconstituted in vitro.\",\n      \"method\": \"In vitro reconstitution of entire LPS transfer cascade, negative-stain electron microscopy, single-molecule TIRF fluorescence analysis, structural characterization of intermediate complexes\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full reconstitution in vitro, EM structural characterization of intermediates, single-molecule analysis, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"27986454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LBP forms complexes with lipoteichoic acid (LTA) from S. pneumoniae and S. aureus and catalytically transfers LTA to CD14, enabling TLR2-dependent immune cell activation; TLR4 and MD-2 are not involved in LTA recognition.\",\n      \"method\": \"Native gel electrophoresis (PhastGel) to verify LTA-LBP and LBP-sCD14 complex formation and catalytic transfer; HEK293/CD14 and CHO cell transfection with TLR2, TLR4, MD-2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct demonstration of complex formation and catalytic transfer by native gel, cell-based functional assays with transfection, negative result for TLR4/MD-2 rigorously established\",\n      \"pmids\": [\"12594207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LBP (and sCD14) independently deliver triacylated lipoproteins to TLR1-TLR2, enhancing ternary complex formation between TLR1, TLR2, and triacylated lipopeptide agonist, without remaining physically associated with the final complex. Either protein alone suffices to sensitize TLR-expressing cells to nanogram levels of lipopeptide.\",\n      \"method\": \"Size exclusion chromatography to measure ternary complex formation with soluble extracellular TLR1/TLR2 domains; cell activation assays with synthetic lipopeptide (Pam3CSK4) and natural lipoprotein OspA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted in vitro with purified recombinant proteins, two orthogonal methods (SEC + cell activation), replicated with two distinct agonists\",\n      \"pmids\": [\"23430250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In human coronary artery endothelial cells, LBP enables LPS uptake and delivery to intracellularly located TLR4-MD2 via a scavenger receptor pathway, facilitating cell activation at low LPS concentrations. LPS internalization—dependent on LBP—is required for cell activation because TLR4 functions intracellularly in these cells.\",\n      \"method\": \"FACS, confocal microscopy, RT-PCR, functional cytokine assays; LBP-dependent LPS uptake demonstrated in HCAEC\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (FACS, confocal, functional assay) in single lab; mechanistic pathway placement established but not independently replicated\",\n      \"pmids\": [\"15132988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LBP is constitutively present on the surface and in the cytoplasm of monocytes/macrophages; it is internalized in a concentration-dependent manner that is enhanced by LPS. LBP internalization does not depend on CD14 or TLR4/MD-2 but colocalizes with LPS at the cytoplasmic membrane and in intracellular compartments. LBP also facilitates IL-1β production by macrophages in the absence of ATP and is found near activated caspases during inflammasome activation, indicating a role in intracellular LPS transport and signaling beyond its extracellular shuttle function.\",\n      \"method\": \"Flow cytometry, fluorescence quenching, confocal microscopy, membrane fractionation (Triton X-100 solubilization), HEK293 and macrophage cell lines with CD14/TLR4 knockouts, IL-1β ELISA\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (FACS, confocal, fractionation, functional assay), single lab; intracellular colocalization with LPS and inflammasome proximity established\",\n      \"pmids\": [\"26804480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Blocking either LBP-LPS binding (class 1 mAbs) or LPS/LBP-to-CD14 presentation (class 2 mAbs) suppresses LPS-induced TNF production and protects mice from lethal endotoxemia, establishing LBP's critical sequential roles: first binding LPS, then presenting the LPS/LBP complex to CD14.\",\n      \"method\": \"Generation of rat monoclonal antibodies to murine LBP; in vivo endotoxemia mouse model measuring TNF and survival\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo functional epistasis with antibody classes distinguishing two mechanistic steps; single lab but two distinct antibody classes used orthogonally\",\n      \"pmids\": [\"10358200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LBP intercalates in a directed transmembrane orientation into negatively charged lipid bilayers; anti-LBP antibodies bind LBP on both sides of the bilayer after addition to only one side, indicating transmembrane configuration. Pre-formed LPS-LBP complexes in solution do NOT insert into membranes, suggesting that membrane-bound LBP captures aggregated endotoxin directly.\",\n      \"method\": \"Planar lipid bilayer electrical measurements (membrane current, potential, capacitance); antibody binding assays on reconstituted membranes\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — reconstituted planar membrane system with rigorous electrical measurements, single lab, single method type\",\n      \"pmids\": [\"11347890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Membrane-bound LBP (mLBP) is incorporated as a transmembrane protein in the cytoplasmic membrane of human mononuclear cells and mediates binding of aggregated endotoxin and its transfer to transmembrane signaling proteins (TLR4, MaxiK channel). Fluorescence resonance energy transfer spectroscopy showed that endotoxin aggregates are intercalated into reconstituted membranes by mLBP. Soluble LBP complexed with LPS in serum prior to membrane contact neutralizes LPS rather than activating cells.\",\n      \"method\": \"Patch-clamp on excised outside-out cytoplasmic membrane patches; FRET spectroscopy; RT-PCR; cytokine assays\",\n      \"journal\": \"Journal of endotoxin research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (patch-clamp, FRET, RT-PCR, cell assays); single lab; distinguishes soluble vs. membrane-bound LBP functions\",\n      \"pmids\": [\"12831460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LBP is required for LPS-induced disruption of tight junctions in cholangiocyte monolayers. siRNA knockdown of LBP attenuates LPS-induced paracellular permeability increase and redistribution of tight junction proteins (ZO-1, occludin, claudins), placing LBP upstream of c-Src and TLR4 in the signaling pathway mediating barrier disruption.\",\n      \"method\": \"siRNA knockdown of LBP (and TLR4, c-Src); paracellular permeability assays; immunofluorescence of tight junction proteins; Western blot for phosphorylation; myosin light chain kinase inhibitor (ML-7) experiments\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function (siRNA) with specific permeability and protein redistribution readouts, multiple inhibitors, single lab\",\n      \"pmids\": [\"17446308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The LBP gene promoter contains recognition elements typical of acute-phase reactants, and STAT-3 binding to a conserved acute-phase motif is essential for LBP promoter activation. Transcriptional activation involves AP-1 and C/EBPβ transcription factors, as shown by reporter-gene and EMSA assays. LBP mRNA induction occurs via both transcriptional and post-transcriptional mechanisms.\",\n      \"method\": \"Nuclear run-on, RNA half-life experiments, 5' flanking region cloning, luciferase reporter-gene assays with promoter mutation variants, EMSA for AP-1 and C/EBPβ\",\n      \"journal\": \"Cytokines, cellular & molecular therapy / Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary promoter analysis methods (nuclear run-on, reporter gene, EMSA, mutagenesis) in single lab\",\n      \"pmids\": [\"9287245\", \"9442384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LBP gene expression in macrophages is specifically induced by LXR activation (by oxysterols or modified LDL loading) in a cell-type-specific manner (macrophages but not liver). Bone marrow transplant studies in LBP-/- mice showed markedly smaller atherosclerotic lesions and increased macrophage apoptosis in lesions. LBP promotes macrophage survival under cholesterol loading without affecting cholesterol efflux.\",\n      \"method\": \"Bone marrow transplantation with LBP-/- donors into irradiated recipients; Western diet feeding; lesion area quantification; TUNEL staining; in vitro macrophage cholesterol loading assays; LXR agonist treatment\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo bone marrow transplant epistasis plus in vitro mechanistic follow-up; single lab; multiple readouts\",\n      \"pmids\": [\"24671012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hepatic LBP expression is induced by the gut microbiota through MYD88-dependent signaling. LBP potentiates LPS-mediated impairment of insulin signaling in hepatocytes in the presence of low LPS concentrations; this effect is abolished by the LBP-blocking peptide LBPK95A. Systemic blockade of LBP by LBPK95A and CRISPR-Cas9-mediated hepatic Lbp knockdown both improve systemic glucose homeostasis in mice.\",\n      \"method\": \"Liver transcriptomics of germ-free vs. conventionally raised Myd88 KO and WT mice; primary hepatocyte LPS/LBP insulin signaling assays; LBPK95A blocking peptide treatment in vivo; CRISPR-Cas9 hepatic Lbp knockdown; glucose tolerance tests\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal in vivo approaches (germ-free model, CRISPR knockdown, pharmacological blockade) plus in vitro mechanistic validation; single lab\",\n      \"pmids\": [\"32305515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Gastric cancer-derived LBP activates the TLR4/NF-κB pathway in intrahepatic macrophages to promote TGF-β1 secretion, which in turn activates hepatic stellate cells to form a fibrotic pre-metastatic niche. TGF-β1 also enhances migration and invasion of incoming metastatic gastric cancer cells. Co-immunoprecipitation confirmed LBP interaction with macrophage TLR4 signaling components.\",\n      \"method\": \"DIA mass spectrometry; Co-IP; mRNA sequencing of THP-1 macrophages ± LBP; Transwell migration/invasion assays; intrasplenic injection mouse LM model; IF, WB, IHC; galunisertib (TGF-β/Smad inhibitor) treatment in vivo\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including Co-IP, mRNA-seq, in vivo model with pharmacological intervention; single lab\",\n      \"pmids\": [\"37789385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LBP deficiency aggravates high-fat diet-induced NAFLD in rats through an epigenetic mechanism: loss of LBP leads to altered H3K27 acetylation at active enhancers, activating C/EBPβ as a key transcription factor, which in turn drives SCD (stearoyl-CoA desaturase) expression and dysregulated lipid metabolism.\",\n      \"method\": \"LBP-/- rat model with HFD; H3K27ac ChIP-seq; transcriptomic sequencing; integrative enhancer-target gene analysis; qRT-PCR and Western blot for C/EBPβ, SCD, NF-κB, Nrf2\",\n      \"journal\": \"Zoological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO model with ChIP-seq and transcriptomics integration plus mechanistic validation; single lab\",\n      \"pmids\": [\"38114435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LBP binds to double-stranded DNA and, through association with core histones H2A, H2B, and H4 (but not H3), gains tighter chromatin-binding. GST-fusion pulldown with recombinant histones established direct interaction of LBP-p40 (laminin binding protein precursor p40, a distinct protein sharing the LBP abbreviation) with these specific histones. NOTE: This paper concerns the 37/67-kDa laminin-binding protein precursor (RPSA locus), not the LPS-binding protein LBP gene; it is a symbol collision.\",\n      \"method\": \"DNA cellulose column chromatography; GST-histone pulldown\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"EXCLUDED — symbol collision; LBP-p40 is the laminin receptor/RPSA precursor, not the LPS-binding protein encoded by the LBP (BPIFD2) gene queried\",\n      \"pmids\": [\"9878528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LBP is required for control of low-dose (100 CFU) S. typhimurium infection in vivo; LBP-deficient mice fail to control this infection, demonstrating that LBP is essential for innate defense against Gram-negative bacteria at physiologically relevant bacterial doses.\",\n      \"method\": \"LBP-knockout mouse model; in vivo infection with S. typhimurium at low inoculum; survival and bacterial burden readouts\",\n      \"journal\": \"Journal of endotoxin research (cited in review)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined infection phenotype; reported in review (PMID:10725789) referencing primary LBP-/- work; single lab\",\n      \"pmids\": [\"10725789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In septic patient plasma, LPS bound transiently to monocytes is released into plasma lipoproteins; this release is enhanced by sCD14. LBP also inhibited LPS responses after LPS had bound to monocytes, but without requiring extensive release of cell-bound LPS (unlike sCD14). During sepsis, HDL remained the dominant LPS acceptor; in some patients, LPS transfer shifted to an acute-phase VLDL fraction.\",\n      \"method\": \"In vitro experiments with undiluted human septic serum; LPS binding/transfer assays with monocytes and isolated lipoproteins; cytokine response assays\",\n      \"journal\": \"Journal of endotoxin research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays in undiluted human serum with mechanistic dissection of LBP vs. sCD14 roles; single lab\",\n      \"pmids\": [\"12803885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A 170-kDa cysteine metalloprotease from Prevotella intermedia cleaves both CD14 and LBP in a concentration-dependent manner, thereby reducing IL-1β mRNA expression in LPS-activated macrophages. Addition of soluble CD14 abrogated protease-mediated inhibition, placing LBP/CD14 cleavage as the mechanism of immune evasion.\",\n      \"method\": \"Zymographic analysis; molecular mass determination; class-specific protease inhibitors/activators; RT-PCR for IL-1β mRNA in U937 and THP-1 cells; sCD14 rescue experiment\",\n      \"journal\": \"Archives of microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical identification of protease plus functional consequence on macrophage activation; single lab, multiple methods\",\n      \"pmids\": [\"12728301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LBP is expressed locally in lung, kidney, and liver, and LBP and CD14 mRNAs are co-induced in all three organs following cecal ligation and puncture (CLP)-induced peritonitis in mice, with kinetics paralleling local IL-1 mRNA induction. This local co-induction may sensitize these organs to secondary LPS challenge.\",\n      \"method\": \"Northern blot analysis; TaqMan fluorescent quantitative RT-PCR; CLP mouse model with serial tissue harvest\",\n      \"journal\": \"The Journal of surgical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative mRNA analysis across multiple organs with defined in vivo model; single lab\",\n      \"pmids\": [\"9695742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The LBP gene contains 14–15 exons spanning ~28.5 kb, with a 2-kb promoter containing acute-phase response elements. The LPS-binding motif is encoded in exons 3 and 4. Genomic organization is highly conserved with PLTP (and BPI), indicating a common ancestral lipid-binding gene family, with a shared C-terminal octapeptide important for anchoring in lipoprotein particles.\",\n      \"method\": \"Genomic DNA sequencing and exon-intron organization mapping; sequence comparison with PLTP, CETP, BPI\",\n      \"journal\": \"Genomics / Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genomic structural analysis providing functional domain annotation; two independent labs confirming similar organization\",\n      \"pmids\": [\"9441745\", \"9240454\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LBP is a liver-derived acute-phase glycoprotein that binds longitudinally to LPS micelles and catalytically transfers individual LPS molecules first to CD14—via rapid electrostatic binding/unbinding cycles—and then, in a TLR4-dependent step, from CD14 to the TLR4-MD2 signaling complex; it similarly facilitates delivery of lipoteichoic acid and triacylated lipoproteins to TLR2-subfamily receptors. Beyond this extracellular shuttle role, LBP is internalized by macrophages, co-localizes with LPS in intracellular compartments independently of CD14/TLR4, and can intercalate as a transmembrane protein into cell membranes to transfer aggregated endotoxin to membrane-resident signaling proteins (TLR4, MaxiK channel). LBP expression is transcriptionally activated by IL-6 and IL-1β through STAT-3, AP-1, and C/EBPβ binding sites in its promoter, and in macrophages its expression is additionally controlled by LXR-dependent oxysterol/cholesterol loading. Functionally, LBP promotes macrophage survival under cholesterol load, facilitates intrahepatic macrophage TLR4/NF-κB-TGF-β1 signaling to form pre-metastatic niches, potentiates LPS inhibition of hepatocyte insulin signaling downstream of gut microbiota-MYD88 signaling, and epigenetically regulates lipid metabolism through H3K27ac-C/EBPβ-SCD in the liver when absent.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LBP is a liver-derived acute-phase glycoprotein that serves as the apical sensor and shuttle of the LPS-recognition cascade, catalytically extracting individual endotoxin molecules from bacterial membranes and micelles and delivering them to downstream receptors [#0]. It binds longitudinally to LPS micelles and transfers LPS molecules to CD14 through repeated electrostatic binding/unbinding cycles, after which CD14 hands a single LPS molecule to the TLR4-MD2 signaling complex in a TLR4-dependent step; the full cascade and its intermediate complexes have been reconstituted and visualized in vitro [#0]. This catalytic transfer activity extends to other microbial ligands: LBP forms complexes with lipoteichoic acid and delivers it to CD14 for TLR2-dependent activation independently of TLR4/MD-2 [#1], and it delivers triacylated lipoproteins to TLR1-TLR2 without remaining bound to the final ternary complex [#2]. Antibody-blocking and knockout studies establish that these sequential binding and presentation steps are required for LPS-induced TNF production and host defense against Gram-negative bacteria in vivo [#5, #15]. Beyond its extracellular shuttle role, LBP is internalized by monocytes/macrophages independently of CD14 or TLR4, colocalizes with LPS in intracellular compartments, and associates with inflammasome machinery, and it can intercalate as a transmembrane protein into negatively charged bilayers to capture aggregated endotoxin and deliver it to membrane-resident signaling proteins including TLR4 and the MaxiK channel [#4, #6, #7]. LBP transcription is driven by acute-phase signaling through STAT-3, AP-1, and C/EBP\\u03b2 promoter elements [#9], and in macrophages it is additionally induced by LXR-dependent cholesterol/oxysterol loading, where it promotes macrophage survival under cholesterol load [#10]. In disease contexts, gut microbiota-MYD88-induced hepatic LBP potentiates LPS-mediated impairment of hepatocyte insulin signaling and worsens systemic glucose homeostasis [#11], tumor-derived LBP drives intrahepatic macrophage TLR4/NF-\\u03baB-TGF-\\u03b21 signaling to build a pre-metastatic niche [#12], and LBP deficiency aggravates fatty liver disease through H3K27ac-C/EBP\\u03b2-SCD epigenetic dysregulation of lipid metabolism [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established how LBP expression is wired into the acute-phase response, explaining its induction during infection.\",\n      \"evidence\": \"Promoter cloning, luciferase reporters, EMSA and nuclear run-on identifying STAT-3, AP-1, C/EBP\\u03b2 elements; genomic organization and family relationship to PLTP/BPI\",\n      \"pmids\": [\"9287245\", \"9442384\", \"9441745\", \"9240454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish the relative contribution of each transcription factor in vivo\", \"Cell-type-specific promoter usage not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated that LBP is essential for innate defense, not merely a serum amplifier, by showing knockout mice fail to control low-dose Gram-negative infection.\",\n      \"evidence\": \"LBP-knockout mouse infected with low-inoculum S. typhimurium; local co-induction of LBP/CD14 mRNA across lung, kidney, liver in CLP peritonitis model\",\n      \"pmids\": [\"10725789\", \"9695742\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Primary KO infection data reported through a review\", \"Local extrahepatic LBP function not mechanistically dissected\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Resolved that LBP acts in two separable sequential steps in vivo\\u2014LPS binding then presentation to CD14\\u2014by selectively blocking each with antibody classes.\",\n      \"evidence\": \"Class 1 and class 2 anti-LBP monoclonal antibodies in a lethal endotoxemia mouse model measuring TNF and survival\",\n      \"pmids\": [\"10358200\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Antibody epitope mapping to structural domains not provided\", \"Single lab\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Revealed a non-shuttle mode in which LBP itself inserts into membranes as a transmembrane protein, distinguishing membrane-bound from soluble functions.\",\n      \"evidence\": \"Planar lipid bilayer electrical measurements and two-sided antibody binding on reconstituted negatively charged membranes\",\n      \"pmids\": [\"11347890\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method type, single lab\", \"Structural basis of transmembrane orientation unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extended LBP's catalytic transfer activity beyond LPS to Gram-positive and lipoprotein ligands, and defined the membrane-bound LBP route to TLR4 and MaxiK.\",\n      \"evidence\": \"Native gel transfer assays for LTA-CD14; patch-clamp and FRET for membrane-bound LBP delivering aggregated endotoxin; septic serum lipoprotein transfer assays; identification of a P. intermedia protease cleaving LBP/CD14\",\n      \"pmids\": [\"12594207\", \"12831460\", \"12803885\", \"12728301\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Soluble vs membrane-bound LBP balance in vivo unresolved\", \"TLR2-subfamily handoff structure not characterized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed LBP enables intracellular TLR4 signaling in non-myeloid cells by driving scavenger-receptor-mediated LPS uptake.\",\n      \"evidence\": \"FACS, confocal microscopy and cytokine assays in human coronary artery endothelial cells\",\n      \"pmids\": [\"15132988\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific scavenger receptor not identified\", \"Not independently replicated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated LBP and sCD14 each independently sensitize cells to triacylated lipoproteins via TLR1-TLR2 ternary complex formation, generalizing the catalytic-handoff model.\",\n      \"evidence\": \"Size exclusion chromatography with soluble TLR1/TLR2 domains and cell activation with Pam3CSK4 and OspA\",\n      \"pmids\": [\"23430250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative kinetics of transfer not measured\", \"In vivo relevance for lipoprotein sensing not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked LBP to sterol metabolism, showing macrophage LBP is LXR-induced and promotes macrophage survival under cholesterol load with consequences for atherosclerosis.\",\n      \"evidence\": \"LBP-/- bone marrow transplant into irradiated mice on Western diet; lesion quantification, TUNEL, in vitro cholesterol loading, LXR agonist treatment\",\n      \"pmids\": [\"24671012\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway linking LBP to survival not defined\", \"Cholesterol efflux unaffected, leaving mechanism open\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Achieved a full structural/mechanistic reconstitution of the LPS transfer cascade and uncovered an intracellular CD14/TLR4-independent LBP pool near the inflammasome.\",\n      \"evidence\": \"In vitro reconstitution, negative-stain EM and single-molecule TIRF of intermediate complexes; flow cytometry, fractionation, confocal and IL-1\\u03b2 assays in CD14/TLR4-knockout macrophages\",\n      \"pmids\": [\"27986454\", \"26804480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular LBP trafficking route and inflammasome mechanism not defined\", \"How transmembrane vs catalytic shuttle modes are selected in cells unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connected gut microbiota signaling to hepatic LBP and metabolic disease, showing LBP potentiates LPS-driven hepatic insulin resistance.\",\n      \"evidence\": \"Germ-free vs conventional Myd88 KO transcriptomics; primary hepatocyte insulin signaling assays; LBPK95A blocking peptide and CRISPR hepatic Lbp knockdown with glucose tolerance tests\",\n      \"pmids\": [\"32305515\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream insulin signaling node not pinpointed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified a tumor-promoting axis in which tumor-derived LBP engages intrahepatic macrophage TLR4/NF-\\u03baB-TGF-\\u03b21 signaling to build a pre-metastatic niche.\",\n      \"evidence\": \"DIA mass spectrometry, Co-IP, mRNA-seq of THP-1 macrophages, Transwell assays, intrasplenic metastasis mouse model with galunisertib\",\n      \"pmids\": [\"37789385\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct LBP-TLR4 binding interface not structurally defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed an unexpected protective hepatic role of LBP via epigenetic control of lipid metabolism, with deficiency worsening fatty liver disease.\",\n      \"evidence\": \"LBP-/- rat HFD model; H3K27ac ChIP-seq and transcriptomics integration identifying C/EBP\\u03b2-SCD axis; qRT-PCR/WB validation\",\n      \"pmids\": [\"38114435\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which LBP loss alters H3K27ac is unclear\", \"Rat-to-human translation untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LBP partitions between its extracellular catalytic shuttle, transmembrane-insertion, and intracellular trafficking modes\\u2014and what governs its switch between immune sensing and metabolic/epigenetic functions\\u2014remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling soluble shuttle, membrane-bound, and intracellular LBP roles\", \"Structural basis of transmembrane insertion vs catalytic transfer unknown\", \"Intracellular LBP-inflammasome mechanism uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1, 2, 6, 7]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 5, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 6, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 2, 5, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 11, 12]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [10, 11, 13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 12, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CD14\", \"TLR4\", \"MD2\", \"TLR2\", \"TLR1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}