{"gene":"CRP","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2006,"finding":"Calcium-dependent binding of pentameric CRP (pCRP) to cell membranes and liposomes induces a partial structural change, producing a hybrid molecule (mCRP(m)) that retains the native pentameric conformation but expresses monomeric CRP subunit antigenicity; this membrane-associated intermediate enhances complement fixation and can further dissociate to release soluble monomeric CRP (mCRP(s)), which potently stimulates endothelial cells.","method":"Conformational probing with neoepitope-specific antibodies, electron microscopy, complement fixation assay, endothelial cell stimulation assay","journal":"FASEB Journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (EM visualization, neoepitope detection, functional complement and cell stimulation assays) in a single focused mechanistic study","pmids":["17116742"],"is_preprint":false},{"year":2023,"finding":"The monomeric CRP isoform (mCRP) drives pro-inflammatory amplification (e.g., activation of platelets, neutrophils, monocytes, endothelial cells, and complement), whereas pentameric CRP (pCRP) exerts weak anti-inflammatory effects; conversion of pCRP to mCRP occurs upon dissociation of subunits and is facilitated by membrane contact, and the two isoforms differ in ligand recognition and effector functions.","method":"Review integrating published in vitro bioactivity data, isoform-specific reagents, and structural analysis of each CRP conformer","journal":"Frontiers in Immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — comprehensive integration of multiple published experiments across labs, but this paper itself is a review/re-interpretation rather than primary experimental data","pmids":["37781355"],"is_preprint":false},{"year":2004,"finding":"CRP binds phosphocholine (PC)-containing ligands (e.g., modified LDL, apoptotic cells) in a calcium-dependent manner, activates complement, and binds Fc receptors; complement activation by CRP complexes arrests production of the membrane-damaging terminal complement complex.","method":"Binding assays, complement activation assays, Fc receptor interaction studies reviewed from prior literature","journal":"Molecular Immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — foundational biochemical activities replicated across multiple labs and summarized here; individual assays well-established","pmids":["15829284"],"is_preprint":false},{"year":2011,"finding":"Fcγ receptors (FcγR) are identified as the primary cellular receptors for the pentraxins CRP and SAP; structural analysis of SAP in complex with FcγRIIa provided mechanistic insight into pentraxin-mediated opsonization and clearance of apoptotic/damaged cells.","method":"Crystal structure of SAP–FcγRIIa complex; functional receptor-binding studies","journal":"Current Opinion in Organ Transplantation","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — crystal structure is for SAP (not CRP directly), but the paper establishes FcγR as primary pentraxin receptors including CRP; single review synthesis","pmids":["21150611"],"is_preprint":false},{"year":2008,"finding":"CRP induces release of chemokines CCL2, CCL3, and CCL4 from human adherent monocytes through binding to FcγRIIa (CD32a), FcγRIIb (CD32b), and FcγRI (CD64); this effect requires Mac-1 (CD11b)/ICAM-1 interaction, as blockade of this interaction abolished CRP-induced chemokine secretion. CRP also upregulates Mac-1 and ICAM-1 on adherent monocytes and downregulates corresponding chemokine receptors CCR1, CCR2, and CCR5 via autocrine chemokine secretion.","method":"ELISA for chemokines, flow cytometry for adhesion molecules and receptors, real-time RT-PCR, neutralizing antibody blockade, Boyden chamber migration assay","journal":"Journal of Leukocyte Biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ELISA, flow cytometry, RT-PCR, functional blockade, migration assay) in a single focused study establishing mechanism","pmids":["18591415"],"is_preprint":false},{"year":1997,"finding":"The leukocyte CRP receptor (CRP-R) recognizes residues 31–36 (KAFTVC) on the surface of each CRP subunit; residues AFTV are critical for receptor binding, and Phe-33 and Leu-37 are critical for CRP-induced superoxide generation in granulocytes. An altered (heat-modified) CRP conformation is preferentially recognized by CRP-R.","method":"Competitive binding with synthetic peptides, [125I]-CRP binding assay on monocytes/granulocytes, F(ab')2 inhibition, superoxide generation assay in HL-60 cells","journal":"Journal of Cellular Biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (radioligand competition, antibody inhibition, peptide truncation/mutagenesis, functional superoxide assay) mapping the receptor-binding epitope","pmids":["9015762"],"is_preprint":false},{"year":2018,"finding":"Monomeric CRP (mCRP) docks at the CRH2-FNIII domain of the leptin receptor (proximal to the cell membrane, distinct from the leptin-binding site), and this interaction was validated by solid-phase binding assay and co-immunoprecipitation of CRP with soluble leptin receptor from human plasma.","method":"Molecular docking (bioinformatics), solid-phase binding assay, co-immunoprecipitation from human plasma, ELISA","journal":"Frontiers in Immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP from human plasma and solid-phase assay support the interaction; docking is computational; single lab","pmids":["29910808"],"is_preprint":false},{"year":2020,"finding":"CRP recognizes monosodium urate (MSU) crystals and is required for fixation of complement components C1q, C1r, C1s, and MASP1 onto crystal surfaces; CRP binding is strong enough to specifically deplete CRP from human serum, and its binding is non-uniform, preferentially at edges or distinct crystal faces.","method":"Affinity purification of MSU crystal-binding proteins from human serum/plasma, MS identification, complement component fixation assay, CRP depletion experiment","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biochemical reconstitution with purified components (complement fixation on crystals), multiple orthogonal assays (affinity purification, MS, depletion) in a focused study","pmids":["32286427"],"is_preprint":false},{"year":2022,"finding":"CRP activates the classical complement pathway on MSU crystals more efficiently than natural IgM; CRP is more efficient at fixating active C1 on crystals and inducing release of C5a (the most inflammatory anaphylatoxin), indicating non-redundant functions distinct from IgM-mediated complement activation.","method":"Complement activation assays measuring C4a, C3a, C5a in serum depleted of IgM and/or CRP; C1 fixation assay on MSU crystals","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mechanistic reconstitution with defined component depletions, measuring stepwise complement anaphylatoxin production, replicating and extending prior crystal-binding work","pmids":["35296708"],"is_preprint":false},{"year":2018,"finding":"CRP induces GDF15 transcription in human aortic endothelial cells through p53; CRP treatment or CRP plasmid transfection increased GDF15 promoter luciferase activity, and chromatin immunoprecipitation (ChIP) confirmed p53 recruitment to GDF15 promoter binding sites in response to CRP.","method":"Dual-luciferase reporter assay, chromatin immunoprecipitation (ChIP), CRP plasmid transfection, in vitro CRP treatment of endothelial cells","journal":"Mediators of Inflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP and reporter assays in a single lab; mechanistically defined p53-dependent pathway but not independently replicated","pmids":["29967567"],"is_preprint":false},{"year":2011,"finding":"Sirt1 physically interacts with HNF-1α in vitro and co-localizes with HNF-1α on two HNF-1α binding sites in the Crp promoter in vivo only under nutrient-restricting conditions; this interaction suppresses HNF-1α transcriptional activity and Crp expression in mouse primary hepatocytes, accompanied by decreased acetylation of histone H4 lysine 16 at Crp promoter sites.","method":"Co-immunoprecipitation (in vitro and in vivo), chromatin immunoprecipitation (ChIP), luciferase reporter assay, pharmacological Sirt1 inhibition, primary hepatocyte culture, histone modification analysis","journal":"Aging Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (co-IP, ChIP, reporter assay, pharmacological inhibition, histone modification) in a focused mechanistic study; mouse Crp ortholog","pmids":["21176092"],"is_preprint":false},{"year":2019,"finding":"CRP production in the liver is suppressed by Leflunomide through an AHR-ARNT transcriptional mechanism; high CRP in vivo upregulates HIF1α, which competes with AHR for ARNT association, thereby interfering with Leflunomide-AHR-CRP signaling. Hepatocyte-specific HIF1α deletion or pharmacological HIF1α inhibition restores AHR-dependent CRP suppression.","method":"Hepatocyte-specific HIF1α conditional knockout, pharmacological HIF1α inhibition (acriflavine), co-immunoprecipitation (AHR-ARNT interaction), animal model of arthritis, serum CRP measurement","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — genetic (conditional KO) and pharmacological interventions plus co-IP establish the mechanistic circuit; multiple orthogonal approaches in a focused study","pmids":["31594926"],"is_preprint":false},{"year":2019,"finding":"JAK/STAT signaling (specifically the IL-6/JAK/STAT pathway) mediates CRP induction in human hepatocytes; the JAK1/2 inhibitor ruxolitinib fully inhibits LPS-, cytokine- (IL-1β, IL-6, TNFα), and TLR agonist-induced CRP mRNA expression and secretion at nanomolar concentrations; blockade of IL-6 receptor by tocilizumab similarly prevents CRP induction.","method":"Primary human hepatocyte and HepaRG cell treatment, CRP ELISA, CRP mRNA quantification, ruxolitinib dose-response, anti-IL-6R antibody (tocilizumab) neutralization, Western blot for JAK/STAT pathway activation","journal":"Inflammation Research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (mRNA, protein secretion, pharmacological and antibody pathway inhibition) in primary human hepatocytes; mechanistic pathway clearly defined","pmids":["31654094"],"is_preprint":false},{"year":1993,"finding":"Mouse CRP gene expression is induced approximately 3-fold by IL-1 but not by IL-6 in isolated hepatocytes, in contrast to human CRP which is strongly induced by IL-6; the IL-1-responsive induction appears to occur at a post-transcriptional level, as C/EBP elements in the promoter failed to respond to IL-1 in transfection assays.","method":"Primary mouse hepatocyte culture, cytokine stimulation, gene expression analysis, CAT reporter transfection in Hep 3B2 cells","journal":"Cytokine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct functional experiment in primary hepatocytes with reporter assay; single lab, mouse ortholog; negative result for IL-6 mechanistically informative","pmids":["8260597"],"is_preprint":false},{"year":2019,"finding":"Production of CRP by a pNEN cell line is stimulated by IL-6, which activates ERK, AKT, and STAT3 signaling pathways; exogenous CRP in turn increases IL-6 secretion and invasion of pNEN cells, and CRP is taken up by these cells. This CRP-IL-6 positive feedback loop is associated with activation of ERK/AKT/STAT3 pathways.","method":"ELISA, Western blot (phospho-ERK, phospho-AKT, phospho-STAT3), flow cytometry, immunocytochemistry, invasion and proliferation assays in BON1 and QGP1 pNEN cell lines","journal":"Endocrine Connections","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple methods in cell lines; single lab; CRP uptake and signaling mechanistically defined but not independently replicated","pmids":["31234146"],"is_preprint":false},{"year":2009,"finding":"CRP production is induced by proinflammatory cytokines IL-1, IL-6, and IL-17 in the liver; these cytokines signal through their respective receptors on hepatic cells, activating kinases and phosphatases that translocate transcription factors to the CRP gene promoter.","method":"Review of cytokine signaling and promoter regulation studies","journal":"Advances in Clinical Chemistry","confidence":"Low","confidence_rationale":"Tier 4 / Moderate — review paper summarizing published mechanistic data; no primary experimental data presented","pmids":["19803417"],"is_preprint":false},{"year":2023,"finding":"Extracellular vesicles (EVs) in SLE plasma carry both pentameric CRP (pCRP) and monomeric CRP (mCRP) on their surfaces; mCRP+ but not pCRP+ EVs are elevated in patients with active disease and correlate with anti-CRP autoantibody positivity, suggesting mCRP on EVs as a potential autoantigen in SLE.","method":"Flow cytometry for CRP isoforms on EVs, ELISA for anti-mCRP autoantibodies, correlation analysis in 67 SLE patients vs. 60 controls","journal":"Journal of Autoimmunity","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — direct detection of isoform-specific CRP on EVs with functional correlation to disease activity; single cross-sectional study","pmids":["37356347"],"is_preprint":false}],"current_model":"Human CRP (C-reactive protein) is a pentameric acute-phase protein synthesized predominantly in the liver in response to IL-6 (and IL-1/IL-17) signaling through the JAK/STAT pathway, regulated in part by a nutrient-sensitive Sirt1–HNF-1α interaction and by an AHR–HIF1α competition for ARNT; the pentamer (pCRP) binds phosphocholine-containing ligands (modified LDL, apoptotic cells, MSU crystals) in a calcium-dependent manner, activates the classical complement pathway via C1 fixation (producing C5a), and signals through FcγRI/IIa/IIb on leukocytes via a receptor-binding epitope (residues 31–36, KAFTVC) to induce chemokine secretion and Mac-1/ICAM-1 upregulation on monocytes; membrane contact converts pCRP into a transitional isoform (mCRP(m)) and ultimately into soluble monomeric CRP (mCRP), which has distinct and potently pro-inflammatory bioactivities including endothelial cell stimulation, leptin receptor binding, and EV opsonization relevant to autoimmunity."},"narrative":{"mechanistic_narrative":"CRP (C-reactive protein) is a hepatically-produced pentraxin that acts as a conformationally regulated effector of innate immunity, recognizing damage- and pathogen-associated ligands and coupling them to complement activation and leukocyte signaling [PMID:15829284, PMID:32286427]. Its hepatic synthesis is driven by proinflammatory cytokines, principally through the IL-6/JAK/STAT axis, since the JAK1/2 inhibitor ruxolitinib and the IL-6R-blocking antibody tocilizumab abolish cytokine-, LPS-, and TLR-agonist-induced CRP expression in human hepatocytes [PMID:31654094]. This transcriptional output is gated by a nutrient-sensitive circuit in which Sirt1 binds HNF-1α and represses the CRP promoter under nutrient restriction via reduced histone H4K16 acetylation [PMID:21176092], and by an AHR–HIF1α competition for ARNT, whereby high CRP induces HIF1α that displaces AHR from ARNT to oppose AHR-dependent CRP suppression [PMID:31594926]. Functionally, the native pentamer (pCRP) binds phosphocholine-containing ligands such as modified LDL and apoptotic cells, and also monosodium urate crystals, in a calcium-dependent manner, fixing C1q/C1r/C1s and activating the classical complement pathway to release the anaphylatoxin C5a more efficiently than IgM [PMID:15829284, PMID:32286427, PMID:35296708]. CRP signals to leukocytes through Fcγ receptors (FcγRI/IIa/IIb), via a receptor-binding epitope spanning residues 31–36 (KAFTVC), inducing CCL2/CCL3/CCL4 chemokine secretion from monocytes in a Mac-1/ICAM-1-dependent manner and remodeling chemokine receptor expression [PMID:18591415, PMID:9015762]. A central regulatory theme is conformational conversion: calcium-dependent membrane contact converts pCRP into a structural intermediate (mCRP(m)) that enhances complement fixation and dissociates into soluble monomeric CRP (mCRP), the more potently pro-inflammatory isoform that stimulates endothelial cells, platelets, and neutrophils [PMID:17116742, PMID:37781355]. mCRP further engages the leptin receptor at its CRH2-FNIII domain [PMID:29910808] and drives p53-dependent GDF15 transcription in endothelial cells [PMID:29967567], and mCRP displayed on extracellular vesicles is elevated in active SLE and correlates with anti-CRP autoantibodies [PMID:37356347].","teleology":[{"year":1993,"claim":"Established that CRP cytokine responsiveness is species-divergent, with mouse Crp induced by IL-1 (post-transcriptionally) rather than IL-6, framing the question of how human CRP is transcriptionally controlled.","evidence":"Primary mouse hepatocyte cytokine stimulation with CAT reporter transfection in Hep 3B2 cells","pmids":["8260597"],"confidence":"Medium","gaps":["Does not define the human IL-6 transcriptional machinery","Post-transcriptional mechanism not molecularly resolved","Mouse ortholog may not generalize to human regulation"]},{"year":1997,"claim":"Mapped the leukocyte CRP receptor-binding epitope to residues 31–36 (KAFTVC) with AFTV critical for binding and Phe-33/Leu-37 critical for superoxide induction, defining the structural basis of CRP-leukocyte signaling.","evidence":"Synthetic peptide competition, [125I]-CRP binding on monocytes/granulocytes, F(ab')2 inhibition, and superoxide assay in HL-60 cells","pmids":["9015762"],"confidence":"High","gaps":["Receptor identity not molecularly defined in this study","Preference for heat-modified CRP not linked to a defined conformer","Downstream signaling pathway not mapped"]},{"year":2004,"claim":"Consolidated CRP's core biochemical activities — calcium-dependent phosphocholine ligand binding, complement activation, and Fc receptor engagement — including the observation that CRP-driven complement activation arrests the membrane-damaging terminal complex.","evidence":"Review of binding, complement activation, and Fc receptor assays from prior literature","pmids":["15829284"],"confidence":"Medium","gaps":["Review synthesis, not primary data","Specific Fc receptor isoforms not resolved here","Conformational dependence not addressed"]},{"year":2006,"claim":"Resolved how a stable serum pentamer becomes pro-inflammatory by showing calcium-dependent membrane binding produces a hybrid intermediate (mCRP(m)) that enhances complement fixation and releases endothelium-stimulating soluble mCRP.","evidence":"Neoepitope-specific antibody probing, electron microscopy, complement fixation, and endothelial cell stimulation assays","pmids":["17116742"],"confidence":"High","gaps":["In vivo relevance of the membrane intermediate not established","Quantitative kinetics of pCRP→mCRP dissociation undefined","Receptors mediating endothelial stimulation not identified"]},{"year":2008,"claim":"Defined the leukocyte effector mechanism by showing CRP induces CCL2/CCL3/CCL4 via FcγRI/IIa/IIb and an obligatory Mac-1/ICAM-1 interaction, while reprogramming monocyte chemokine receptor expression.","evidence":"Chemokine ELISA, flow cytometry, RT-PCR, neutralizing antibody blockade, and Boyden chamber migration in human adherent monocytes","pmids":["18591415"],"confidence":"High","gaps":["Does not distinguish pCRP vs mCRP isoform responsibility","Intracellular signaling downstream of FcγR not mapped","In vivo monocyte recruitment not tested"]},{"year":2011,"claim":"Identified Fcγ receptors as the primary cellular receptors for pentraxins including CRP and provided structural insight into pentraxin-FcγR opsonization via the SAP–FcγRIIa complex.","evidence":"Crystal structure of SAP–FcγRIIa and functional receptor-binding studies (review synthesis)","pmids":["21150611"],"confidence":"Medium","gaps":["Crystal structure is of SAP, not CRP","Direct CRP–FcγR structural details not resolved","Single review synthesis"]},{"year":2011,"claim":"Revealed nutrient-sensitive transcriptional gating of CRP by demonstrating Sirt1 binds HNF-1α and represses the promoter under nutrient restriction with reduced H4K16 acetylation.","evidence":"Co-IP, ChIP, luciferase reporter, pharmacological Sirt1 inhibition, and histone modification analysis in mouse primary hepatocytes","pmids":["21176092"],"confidence":"High","gaps":["Demonstrated in mouse Crp ortholog","Interplay with cytokine-driven induction not integrated","Physiological metabolic triggers not defined"]},{"year":2018,"claim":"Extended mCRP's receptor repertoire by showing it docks at the leptin receptor CRH2-FNIII domain distinct from the leptin-binding site, validated in human plasma.","evidence":"Molecular docking, solid-phase binding, co-immunoprecipitation from human plasma, and ELISA","pmids":["29910808"],"confidence":"Medium","gaps":["Docking is computational","Single lab, no functional consequence of leptin receptor engagement shown","Affinity and competition with leptin not quantified"]},{"year":2018,"claim":"Defined a downstream transcriptional consequence of CRP on the vasculature by showing CRP induces GDF15 through p53 recruitment to the GDF15 promoter in endothelial cells.","evidence":"Dual-luciferase reporter, ChIP for p53, CRP plasmid transfection, and CRP treatment of human aortic endothelial cells","pmids":["29967567"],"confidence":"Medium","gaps":["Receptor linking CRP to p53 activation not identified","Single lab, not independently replicated","Isoform responsible not specified"]},{"year":2019,"claim":"Established the dominant hepatic induction pathway by showing IL-6/JAK/STAT signaling is required for CRP expression, with ruxolitinib and tocilizumab abolishing cytokine/TLR-driven induction.","evidence":"Primary human hepatocyte and HepaRG treatment, CRP ELISA, mRNA quantification, ruxolitinib dose-response, tocilizumab neutralization, Western blot","pmids":["31654094"],"confidence":"High","gaps":["Specific STAT transcription factor binding to the CRP promoter not directly mapped here","Contribution of IL-1/IL-17 arms not dissected","Crosstalk with Sirt1/AHR circuits not integrated"]},{"year":2019,"claim":"Uncovered an AHR–HIF1α regulatory node where high CRP induces HIF1α that competes with AHR for ARNT, defining a feedback circuit governing pharmacological CRP suppression.","evidence":"Hepatocyte-specific HIF1α conditional knockout, acriflavine inhibition, AHR-ARNT co-IP, and an arthritis animal model with serum CRP measurement","pmids":["31594926"],"confidence":"High","gaps":["Endogenous (non-drug) physiological role of AHR-ARNT control unclear","Direct ARNT/AHR binding to CRP promoter not mapped","Integration with IL-6/JAK/STAT not resolved"]},{"year":2019,"claim":"Demonstrated a CRP–IL-6 positive feedback loop in pancreatic neuroendocrine tumor cells, where IL-6 induces CRP and CRP enhances IL-6 secretion and invasion via ERK/AKT/STAT3.","evidence":"ELISA, Western blot for phospho-ERK/AKT/STAT3, flow cytometry, immunocytochemistry, and invasion/proliferation assays in BON1/QGP1 cells","pmids":["31234146"],"confidence":"Medium","gaps":["Single lab cell-line model","Receptor mediating CRP uptake/signaling not identified","Isoform responsible not defined"]},{"year":2020,"claim":"Identified CRP as a key serum opsonin of monosodium urate crystals, required for fixation of C1q/C1r/C1s/MASP1 and binding strongly enough to deplete CRP from serum.","evidence":"Affinity purification of MSU crystal-binding proteins, MS identification, complement fixation assay, and CRP depletion experiments","pmids":["32286427"],"confidence":"High","gaps":["Conformational state of CRP on crystals not defined","Basis of non-uniform crystal-face binding unexplained","In vivo gout relevance not directly tested"]},{"year":2022,"claim":"Showed CRP non-redundantly drives classical complement activation on MSU crystals, fixing active C1 and producing C5a more efficiently than IgM.","evidence":"Complement activation assays measuring C4a/C3a/C5a in IgM- and/or CRP-depleted serum, with C1 fixation assay on crystals","pmids":["35296708"],"confidence":"High","gaps":["In vivo contribution to gout inflammation not established","Isoform-specific contributions not separated","Downstream cellular consequences of C5a not measured"]},{"year":2023,"claim":"Linked CRP conformational isoforms to autoimmunity by detecting mCRP on extracellular vesicle surfaces in SLE, where mCRP+ EVs track with disease activity and anti-CRP autoantibodies.","evidence":"Flow cytometry of CRP isoforms on EVs and anti-mCRP ELISA in 67 SLE patients vs 60 controls","pmids":["37356347"],"confidence":"Medium","gaps":["Cross-sectional correlation, not causal","Mechanism of mCRP loading onto EVs unknown","Pathogenic role of anti-mCRP antibodies not demonstrated"]},{"year":null,"claim":"How CRP's conformational conversion (pCRP→mCRP) is regulated in vivo and integrated with its distinct receptor engagements remains the central open question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No in vivo quantification of pCRP→mCRP conversion rates","Definitive molecular identity and structure of the CRP–FcγR complex undefined","How the multiple transcriptional regulators (IL-6/STAT, Sirt1-HNF1α, AHR-HIF1α) are integrated is unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,7,8]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,5,6]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[7,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,4,7,8]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10,11,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,14]}],"complexes":[],"partners":["FCGR1A","FCGR2A","FCGR2B","ITGAM","ICAM1","C1QA","LEPR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P02741","full_name":"C-reactive protein","aliases":[],"length_aa":224,"mass_kda":25.0,"function":"Displays several functions associated with host defense: it promotes agglutination, bacterial capsular swelling, phagocytosis and complement fixation through its calcium-dependent binding to phosphorylcholine. Can interact with DNA and histones and may scavenge nuclear material released from damaged circulating cells","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P02741/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CRP","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CRP","total_profiled":1310},"omim":[{"mim_id":"621551","title":"TRANSMEMBRANE PROTEIN 39B; TMEM39B","url":"https://www.omim.org/entry/621551"},{"mim_id":"621409","title":"AUTOINFLAMMATION AND AUTOIMMUNITY, SYSTEMIC, WITH IMMUNE DYSREGULATION 2; AIAISD2","url":"https://www.omim.org/entry/621409"},{"mim_id":"621216","title":"PLAQUE-ENRICHED LONG NONCODING RNA IN ATHEROSCLEROTIC AND INFLAMMATORY BOWEL MACROPHAGE REGULATION; PELATON","url":"https://www.omim.org/entry/621216"},{"mim_id":"621140","title":"CONGENITAL DISORDER OF GLYCOSYLATION TYPE 1EE WITH OR WITHOUT IMMUNODEFICIENCY; CDG1EE","url":"https://www.omim.org/entry/621140"},{"mim_id":"621030","title":"AUTOINFLAMMATION, PANNICULITIS, AND DERMATOSIS SYNDROME, AUTOSOMAL DOMINANT; AIPDSA","url":"https://www.omim.org/entry/621030"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Intermediate filaments","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"liver","ntpm":8524.7}],"url":"https://www.proteinatlas.org/search/CRP"},"hgnc":{"alias_symbol":["PTX1"],"prev_symbol":[]},"alphafold":{"accession":"P02741","domains":[{"cath_id":"2.60.120.200","chopping":"26-221","consensus_level":"high","plddt":98.1506,"start":26,"end":221}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P02741","model_url":"https://alphafold.ebi.ac.uk/files/AF-P02741-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P02741-F1-predicted_aligned_error_v6.png","plddt_mean":94.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CRP","jax_strain_url":"https://www.jax.org/strain/search?query=CRP"},"sequence":{"accession":"P02741","fasta_url":"https://rest.uniprot.org/uniprotkb/P02741.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P02741/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P02741"}},"corpus_meta":[{"pmid":"29895893","id":"PMC_29895893","title":"What does plasma CRP tell us about peripheral and central inflammation in depression?","date":"2018","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/29895893","citation_count":353,"is_preprint":false},{"pmid":"12842840","id":"PMC_12842840","title":"Human CRP gene polymorphism influences CRP levels: implications for the prediction and pathogenesis of coronary heart disease.","date":"2003","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/12842840","citation_count":258,"is_preprint":false},{"pmid":"10462277","id":"PMC_10462277","title":"Serum C-reactive protein (CRP) and risk of death in chronic dialysis patients.","date":"1999","source":"Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal 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Society","url":"https://pubmed.ncbi.nlm.nih.gov/32475777","citation_count":14,"is_preprint":false},{"pmid":"37356347","id":"PMC_37356347","title":"Extracellular vesicles opsonized by monomeric C-reactive protein (CRP) are accessible as autoantigens in patients with systemic lupus erythematosus and associate with autoantibodies against CRP.","date":"2023","source":"Journal of autoimmunity","url":"https://pubmed.ncbi.nlm.nih.gov/37356347","citation_count":14,"is_preprint":false},{"pmid":"9015762","id":"PMC_9015762","title":"Binding site on human C-reactive protein (CRP) recognized by the leukocyte CRP-receptor.","date":"1997","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9015762","citation_count":14,"is_preprint":false},{"pmid":"35296708","id":"PMC_35296708","title":"Natural antibodies and CRP drive anaphylatoxin production by urate crystals.","date":"2022","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/35296708","citation_count":13,"is_preprint":false},{"pmid":"33861438","id":"PMC_33861438","title":"Curcumin Can Bind and Interact with CRP: An in silico Study.","date":"2021","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/33861438","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47547,"output_tokens":5287,"usd":0.110973,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12794,"output_tokens":5398,"usd":0.09946,"stage2_stop_reason":"end_turn"},"total_usd":0.210433,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to distinguish between:\n1. Human/mammalian CRP (C-reactive protein) - the innate immune pentraxin\n2. Bacterial CRP (cAMP receptor protein) - the transcription factor in E. coli and other bacteria\n3. Other CRP symbols (cystatin-related protein, horseshoe crab CRP2, etc.)\n\nThe query gene \"CRP\" in human context refers to C-reactive protein (the pentraxin). I will extract mechanistic discoveries about the human/mammalian CRP pentraxin, and also note that many papers describe the bacterial cAMP receptor protein (a different gene entirely - symbol collision). I will exclude bacterial CRP papers as symbol collisions.\n\nPapers about human/mammalian CRP with mechanistic content:\n- PMID 17116742: pCRP dissociation by membranes → mCRP formation\n- PMID 37781355: isoform-specific bioactivities (pCRP vs mCRP)\n- PMID 15559367: CRP binds phosphocholine, activates complement, binds Fc receptors\n- PMID 37356347: mCRP on extracellular vesicles\n- PMID 32286427: CRP recognizes MSU crystals, recruits C1 and MASP1\n- PMID 35296708: CRP activates classical complement on MSU crystals\n- PMID 18591415: CRP induces chemokine secretion via CD32a/b, CD64 and Mac-1/ICAM-1\n- PMID 9015762: CRP receptor binding site mapped to residues 31-36\n- PMID 21150611: Fcγ receptors as primary receptors for pentraxins\n- PMID 29910808: mCRP binds leptin receptor (co-IP validation)\n- PMID 23688010: CRP binds leptin extracellularly\n- PMID 21176092: Sirt1/HNF-1α regulates Crp expression in hepatocytes\n- PMID 19803417: IL-6, IL-1, IL-17 induce CRP production in liver via JAK/STAT\n- PMID 31654094: JAK/STAT pathway mediates CRP induction; ruxolitinib blocks it\n- PMID 29967567: CRP induces GDF15 via p53 in endothelial cells\n- PMID 31594926: AHR-ARNT interaction inhibits hepatic CRP production; HIF1α competes\n- PMID 8260597: Mouse CRP induced by IL-1 but not IL-6 (negative finding re IL-6)\n- PMID 29777721: Cod CRP-I and CRP-II are post-translationally deiminated\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"Calcium-dependent binding of pentameric CRP (pCRP) to cell membranes and liposomes induces a partial structural change, producing a hybrid molecule (mCRP(m)) that retains the native pentameric conformation but expresses monomeric CRP subunit antigenicity; this membrane-associated intermediate enhances complement fixation and can further dissociate to release soluble monomeric CRP (mCRP(s)), which potently stimulates endothelial cells.\",\n      \"method\": \"Conformational probing with neoepitope-specific antibodies, electron microscopy, complement fixation assay, endothelial cell stimulation assay\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (EM visualization, neoepitope detection, functional complement and cell stimulation assays) in a single focused mechanistic study\",\n      \"pmids\": [\"17116742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The monomeric CRP isoform (mCRP) drives pro-inflammatory amplification (e.g., activation of platelets, neutrophils, monocytes, endothelial cells, and complement), whereas pentameric CRP (pCRP) exerts weak anti-inflammatory effects; conversion of pCRP to mCRP occurs upon dissociation of subunits and is facilitated by membrane contact, and the two isoforms differ in ligand recognition and effector functions.\",\n      \"method\": \"Review integrating published in vitro bioactivity data, isoform-specific reagents, and structural analysis of each CRP conformer\",\n      \"journal\": \"Frontiers in Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — comprehensive integration of multiple published experiments across labs, but this paper itself is a review/re-interpretation rather than primary experimental data\",\n      \"pmids\": [\"37781355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CRP binds phosphocholine (PC)-containing ligands (e.g., modified LDL, apoptotic cells) in a calcium-dependent manner, activates complement, and binds Fc receptors; complement activation by CRP complexes arrests production of the membrane-damaging terminal complement complex.\",\n      \"method\": \"Binding assays, complement activation assays, Fc receptor interaction studies reviewed from prior literature\",\n      \"journal\": \"Molecular Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — foundational biochemical activities replicated across multiple labs and summarized here; individual assays well-established\",\n      \"pmids\": [\"15829284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Fcγ receptors (FcγR) are identified as the primary cellular receptors for the pentraxins CRP and SAP; structural analysis of SAP in complex with FcγRIIa provided mechanistic insight into pentraxin-mediated opsonization and clearance of apoptotic/damaged cells.\",\n      \"method\": \"Crystal structure of SAP–FcγRIIa complex; functional receptor-binding studies\",\n      \"journal\": \"Current Opinion in Organ Transplantation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — crystal structure is for SAP (not CRP directly), but the paper establishes FcγR as primary pentraxin receptors including CRP; single review synthesis\",\n      \"pmids\": [\"21150611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CRP induces release of chemokines CCL2, CCL3, and CCL4 from human adherent monocytes through binding to FcγRIIa (CD32a), FcγRIIb (CD32b), and FcγRI (CD64); this effect requires Mac-1 (CD11b)/ICAM-1 interaction, as blockade of this interaction abolished CRP-induced chemokine secretion. CRP also upregulates Mac-1 and ICAM-1 on adherent monocytes and downregulates corresponding chemokine receptors CCR1, CCR2, and CCR5 via autocrine chemokine secretion.\",\n      \"method\": \"ELISA for chemokines, flow cytometry for adhesion molecules and receptors, real-time RT-PCR, neutralizing antibody blockade, Boyden chamber migration assay\",\n      \"journal\": \"Journal of Leukocyte Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ELISA, flow cytometry, RT-PCR, functional blockade, migration assay) in a single focused study establishing mechanism\",\n      \"pmids\": [\"18591415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The leukocyte CRP receptor (CRP-R) recognizes residues 31–36 (KAFTVC) on the surface of each CRP subunit; residues AFTV are critical for receptor binding, and Phe-33 and Leu-37 are critical for CRP-induced superoxide generation in granulocytes. An altered (heat-modified) CRP conformation is preferentially recognized by CRP-R.\",\n      \"method\": \"Competitive binding with synthetic peptides, [125I]-CRP binding assay on monocytes/granulocytes, F(ab')2 inhibition, superoxide generation assay in HL-60 cells\",\n      \"journal\": \"Journal of Cellular Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (radioligand competition, antibody inhibition, peptide truncation/mutagenesis, functional superoxide assay) mapping the receptor-binding epitope\",\n      \"pmids\": [\"9015762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Monomeric CRP (mCRP) docks at the CRH2-FNIII domain of the leptin receptor (proximal to the cell membrane, distinct from the leptin-binding site), and this interaction was validated by solid-phase binding assay and co-immunoprecipitation of CRP with soluble leptin receptor from human plasma.\",\n      \"method\": \"Molecular docking (bioinformatics), solid-phase binding assay, co-immunoprecipitation from human plasma, ELISA\",\n      \"journal\": \"Frontiers in Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP from human plasma and solid-phase assay support the interaction; docking is computational; single lab\",\n      \"pmids\": [\"29910808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CRP recognizes monosodium urate (MSU) crystals and is required for fixation of complement components C1q, C1r, C1s, and MASP1 onto crystal surfaces; CRP binding is strong enough to specifically deplete CRP from human serum, and its binding is non-uniform, preferentially at edges or distinct crystal faces.\",\n      \"method\": \"Affinity purification of MSU crystal-binding proteins from human serum/plasma, MS identification, complement component fixation assay, CRP depletion experiment\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical reconstitution with purified components (complement fixation on crystals), multiple orthogonal assays (affinity purification, MS, depletion) in a focused study\",\n      \"pmids\": [\"32286427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRP activates the classical complement pathway on MSU crystals more efficiently than natural IgM; CRP is more efficient at fixating active C1 on crystals and inducing release of C5a (the most inflammatory anaphylatoxin), indicating non-redundant functions distinct from IgM-mediated complement activation.\",\n      \"method\": \"Complement activation assays measuring C4a, C3a, C5a in serum depleted of IgM and/or CRP; C1 fixation assay on MSU crystals\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mechanistic reconstitution with defined component depletions, measuring stepwise complement anaphylatoxin production, replicating and extending prior crystal-binding work\",\n      \"pmids\": [\"35296708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRP induces GDF15 transcription in human aortic endothelial cells through p53; CRP treatment or CRP plasmid transfection increased GDF15 promoter luciferase activity, and chromatin immunoprecipitation (ChIP) confirmed p53 recruitment to GDF15 promoter binding sites in response to CRP.\",\n      \"method\": \"Dual-luciferase reporter assay, chromatin immunoprecipitation (ChIP), CRP plasmid transfection, in vitro CRP treatment of endothelial cells\",\n      \"journal\": \"Mediators of Inflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP and reporter assays in a single lab; mechanistically defined p53-dependent pathway but not independently replicated\",\n      \"pmids\": [\"29967567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sirt1 physically interacts with HNF-1α in vitro and co-localizes with HNF-1α on two HNF-1α binding sites in the Crp promoter in vivo only under nutrient-restricting conditions; this interaction suppresses HNF-1α transcriptional activity and Crp expression in mouse primary hepatocytes, accompanied by decreased acetylation of histone H4 lysine 16 at Crp promoter sites.\",\n      \"method\": \"Co-immunoprecipitation (in vitro and in vivo), chromatin immunoprecipitation (ChIP), luciferase reporter assay, pharmacological Sirt1 inhibition, primary hepatocyte culture, histone modification analysis\",\n      \"journal\": \"Aging Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (co-IP, ChIP, reporter assay, pharmacological inhibition, histone modification) in a focused mechanistic study; mouse Crp ortholog\",\n      \"pmids\": [\"21176092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRP production in the liver is suppressed by Leflunomide through an AHR-ARNT transcriptional mechanism; high CRP in vivo upregulates HIF1α, which competes with AHR for ARNT association, thereby interfering with Leflunomide-AHR-CRP signaling. Hepatocyte-specific HIF1α deletion or pharmacological HIF1α inhibition restores AHR-dependent CRP suppression.\",\n      \"method\": \"Hepatocyte-specific HIF1α conditional knockout, pharmacological HIF1α inhibition (acriflavine), co-immunoprecipitation (AHR-ARNT interaction), animal model of arthritis, serum CRP measurement\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — genetic (conditional KO) and pharmacological interventions plus co-IP establish the mechanistic circuit; multiple orthogonal approaches in a focused study\",\n      \"pmids\": [\"31594926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"JAK/STAT signaling (specifically the IL-6/JAK/STAT pathway) mediates CRP induction in human hepatocytes; the JAK1/2 inhibitor ruxolitinib fully inhibits LPS-, cytokine- (IL-1β, IL-6, TNFα), and TLR agonist-induced CRP mRNA expression and secretion at nanomolar concentrations; blockade of IL-6 receptor by tocilizumab similarly prevents CRP induction.\",\n      \"method\": \"Primary human hepatocyte and HepaRG cell treatment, CRP ELISA, CRP mRNA quantification, ruxolitinib dose-response, anti-IL-6R antibody (tocilizumab) neutralization, Western blot for JAK/STAT pathway activation\",\n      \"journal\": \"Inflammation Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (mRNA, protein secretion, pharmacological and antibody pathway inhibition) in primary human hepatocytes; mechanistic pathway clearly defined\",\n      \"pmids\": [\"31654094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Mouse CRP gene expression is induced approximately 3-fold by IL-1 but not by IL-6 in isolated hepatocytes, in contrast to human CRP which is strongly induced by IL-6; the IL-1-responsive induction appears to occur at a post-transcriptional level, as C/EBP elements in the promoter failed to respond to IL-1 in transfection assays.\",\n      \"method\": \"Primary mouse hepatocyte culture, cytokine stimulation, gene expression analysis, CAT reporter transfection in Hep 3B2 cells\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct functional experiment in primary hepatocytes with reporter assay; single lab, mouse ortholog; negative result for IL-6 mechanistically informative\",\n      \"pmids\": [\"8260597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Production of CRP by a pNEN cell line is stimulated by IL-6, which activates ERK, AKT, and STAT3 signaling pathways; exogenous CRP in turn increases IL-6 secretion and invasion of pNEN cells, and CRP is taken up by these cells. This CRP-IL-6 positive feedback loop is associated with activation of ERK/AKT/STAT3 pathways.\",\n      \"method\": \"ELISA, Western blot (phospho-ERK, phospho-AKT, phospho-STAT3), flow cytometry, immunocytochemistry, invasion and proliferation assays in BON1 and QGP1 pNEN cell lines\",\n      \"journal\": \"Endocrine Connections\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple methods in cell lines; single lab; CRP uptake and signaling mechanistically defined but not independently replicated\",\n      \"pmids\": [\"31234146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CRP production is induced by proinflammatory cytokines IL-1, IL-6, and IL-17 in the liver; these cytokines signal through their respective receptors on hepatic cells, activating kinases and phosphatases that translocate transcription factors to the CRP gene promoter.\",\n      \"method\": \"Review of cytokine signaling and promoter regulation studies\",\n      \"journal\": \"Advances in Clinical Chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Moderate — review paper summarizing published mechanistic data; no primary experimental data presented\",\n      \"pmids\": [\"19803417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Extracellular vesicles (EVs) in SLE plasma carry both pentameric CRP (pCRP) and monomeric CRP (mCRP) on their surfaces; mCRP+ but not pCRP+ EVs are elevated in patients with active disease and correlate with anti-CRP autoantibody positivity, suggesting mCRP on EVs as a potential autoantigen in SLE.\",\n      \"method\": \"Flow cytometry for CRP isoforms on EVs, ELISA for anti-mCRP autoantibodies, correlation analysis in 67 SLE patients vs. 60 controls\",\n      \"journal\": \"Journal of Autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — direct detection of isoform-specific CRP on EVs with functional correlation to disease activity; single cross-sectional study\",\n      \"pmids\": [\"37356347\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human CRP (C-reactive protein) is a pentameric acute-phase protein synthesized predominantly in the liver in response to IL-6 (and IL-1/IL-17) signaling through the JAK/STAT pathway, regulated in part by a nutrient-sensitive Sirt1–HNF-1α interaction and by an AHR–HIF1α competition for ARNT; the pentamer (pCRP) binds phosphocholine-containing ligands (modified LDL, apoptotic cells, MSU crystals) in a calcium-dependent manner, activates the classical complement pathway via C1 fixation (producing C5a), and signals through FcγRI/IIa/IIb on leukocytes via a receptor-binding epitope (residues 31–36, KAFTVC) to induce chemokine secretion and Mac-1/ICAM-1 upregulation on monocytes; membrane contact converts pCRP into a transitional isoform (mCRP(m)) and ultimately into soluble monomeric CRP (mCRP), which has distinct and potently pro-inflammatory bioactivities including endothelial cell stimulation, leptin receptor binding, and EV opsonization relevant to autoimmunity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CRP (C-reactive protein) is a hepatically-produced pentraxin that acts as a conformationally regulated effector of innate immunity, recognizing damage- and pathogen-associated ligands and coupling them to complement activation and leukocyte signaling [#2, #7]. Its hepatic synthesis is driven by proinflammatory cytokines, principally through the IL-6/JAK/STAT axis, since the JAK1/2 inhibitor ruxolitinib and the IL-6R-blocking antibody tocilizumab abolish cytokine-, LPS-, and TLR-agonist-induced CRP expression in human hepatocytes [#12]. This transcriptional output is gated by a nutrient-sensitive circuit in which Sirt1 binds HNF-1\\u03b1 and represses the CRP promoter under nutrient restriction via reduced histone H4K16 acetylation [#10], and by an AHR\\u2013HIF1\\u03b1 competition for ARNT, whereby high CRP induces HIF1\\u03b1 that displaces AHR from ARNT to oppose AHR-dependent CRP suppression [#11]. Functionally, the native pentamer (pCRP) binds phosphocholine-containing ligands such as modified LDL and apoptotic cells, and also monosodium urate crystals, in a calcium-dependent manner, fixing C1q/C1r/C1s and activating the classical complement pathway to release the anaphylatoxin C5a more efficiently than IgM [#2, #7, #8]. CRP signals to leukocytes through Fc\\u03b3 receptors (Fc\\u03b3RI/IIa/IIb), via a receptor-binding epitope spanning residues 31\\u201336 (KAFTVC), inducing CCL2/CCL3/CCL4 chemokine secretion from monocytes in a Mac-1/ICAM-1-dependent manner and remodeling chemokine receptor expression [#4, #5]. A central regulatory theme is conformational conversion: calcium-dependent membrane contact converts pCRP into a structural intermediate (mCRP(m)) that enhances complement fixation and dissociates into soluble monomeric CRP (mCRP), the more potently pro-inflammatory isoform that stimulates endothelial cells, platelets, and neutrophils [#0, #1]. mCRP further engages the leptin receptor at its CRH2-FNIII domain [#6] and drives p53-dependent GDF15 transcription in endothelial cells [#9], and mCRP displayed on extracellular vesicles is elevated in active SLE and correlates with anti-CRP autoantibodies [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established that CRP cytokine responsiveness is species-divergent, with mouse Crp induced by IL-1 (post-transcriptionally) rather than IL-6, framing the question of how human CRP is transcriptionally controlled.\",\n      \"evidence\": \"Primary mouse hepatocyte cytokine stimulation with CAT reporter transfection in Hep 3B2 cells\",\n      \"pmids\": [\"8260597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the human IL-6 transcriptional machinery\", \"Post-transcriptional mechanism not molecularly resolved\", \"Mouse ortholog may not generalize to human regulation\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Mapped the leukocyte CRP receptor-binding epitope to residues 31\\u201336 (KAFTVC) with AFTV critical for binding and Phe-33/Leu-37 critical for superoxide induction, defining the structural basis of CRP-leukocyte signaling.\",\n      \"evidence\": \"Synthetic peptide competition, [125I]-CRP binding on monocytes/granulocytes, F(ab')2 inhibition, and superoxide assay in HL-60 cells\",\n      \"pmids\": [\"9015762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor identity not molecularly defined in this study\", \"Preference for heat-modified CRP not linked to a defined conformer\", \"Downstream signaling pathway not mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Consolidated CRP's core biochemical activities \\u2014 calcium-dependent phosphocholine ligand binding, complement activation, and Fc receptor engagement \\u2014 including the observation that CRP-driven complement activation arrests the membrane-damaging terminal complex.\",\n      \"evidence\": \"Review of binding, complement activation, and Fc receptor assays from prior literature\",\n      \"pmids\": [\"15829284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review synthesis, not primary data\", \"Specific Fc receptor isoforms not resolved here\", \"Conformational dependence not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved how a stable serum pentamer becomes pro-inflammatory by showing calcium-dependent membrane binding produces a hybrid intermediate (mCRP(m)) that enhances complement fixation and releases endothelium-stimulating soluble mCRP.\",\n      \"evidence\": \"Neoepitope-specific antibody probing, electron microscopy, complement fixation, and endothelial cell stimulation assays\",\n      \"pmids\": [\"17116742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of the membrane intermediate not established\", \"Quantitative kinetics of pCRP\\u2192mCRP dissociation undefined\", \"Receptors mediating endothelial stimulation not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the leukocyte effector mechanism by showing CRP induces CCL2/CCL3/CCL4 via Fc\\u03b3RI/IIa/IIb and an obligatory Mac-1/ICAM-1 interaction, while reprogramming monocyte chemokine receptor expression.\",\n      \"evidence\": \"Chemokine ELISA, flow cytometry, RT-PCR, neutralizing antibody blockade, and Boyden chamber migration in human adherent monocytes\",\n      \"pmids\": [\"18591415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not distinguish pCRP vs mCRP isoform responsibility\", \"Intracellular signaling downstream of Fc\\u03b3R not mapped\", \"In vivo monocyte recruitment not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified Fc\\u03b3 receptors as the primary cellular receptors for pentraxins including CRP and provided structural insight into pentraxin-Fc\\u03b3R opsonization via the SAP\\u2013Fc\\u03b3RIIa complex.\",\n      \"evidence\": \"Crystal structure of SAP\\u2013Fc\\u03b3RIIa and functional receptor-binding studies (review synthesis)\",\n      \"pmids\": [\"21150611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Crystal structure is of SAP, not CRP\", \"Direct CRP\\u2013Fc\\u03b3R structural details not resolved\", \"Single review synthesis\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed nutrient-sensitive transcriptional gating of CRP by demonstrating Sirt1 binds HNF-1\\u03b1 and represses the promoter under nutrient restriction with reduced H4K16 acetylation.\",\n      \"evidence\": \"Co-IP, ChIP, luciferase reporter, pharmacological Sirt1 inhibition, and histone modification analysis in mouse primary hepatocytes\",\n      \"pmids\": [\"21176092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Demonstrated in mouse Crp ortholog\", \"Interplay with cytokine-driven induction not integrated\", \"Physiological metabolic triggers not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended mCRP's receptor repertoire by showing it docks at the leptin receptor CRH2-FNIII domain distinct from the leptin-binding site, validated in human plasma.\",\n      \"evidence\": \"Molecular docking, solid-phase binding, co-immunoprecipitation from human plasma, and ELISA\",\n      \"pmids\": [\"29910808\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Docking is computational\", \"Single lab, no functional consequence of leptin receptor engagement shown\", \"Affinity and competition with leptin not quantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a downstream transcriptional consequence of CRP on the vasculature by showing CRP induces GDF15 through p53 recruitment to the GDF15 promoter in endothelial cells.\",\n      \"evidence\": \"Dual-luciferase reporter, ChIP for p53, CRP plasmid transfection, and CRP treatment of human aortic endothelial cells\",\n      \"pmids\": [\"29967567\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor linking CRP to p53 activation not identified\", \"Single lab, not independently replicated\", \"Isoform responsible not specified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established the dominant hepatic induction pathway by showing IL-6/JAK/STAT signaling is required for CRP expression, with ruxolitinib and tocilizumab abolishing cytokine/TLR-driven induction.\",\n      \"evidence\": \"Primary human hepatocyte and HepaRG treatment, CRP ELISA, mRNA quantification, ruxolitinib dose-response, tocilizumab neutralization, Western blot\",\n      \"pmids\": [\"31654094\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific STAT transcription factor binding to the CRP promoter not directly mapped here\", \"Contribution of IL-1/IL-17 arms not dissected\", \"Crosstalk with Sirt1/AHR circuits not integrated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Uncovered an AHR\\u2013HIF1\\u03b1 regulatory node where high CRP induces HIF1\\u03b1 that competes with AHR for ARNT, defining a feedback circuit governing pharmacological CRP suppression.\",\n      \"evidence\": \"Hepatocyte-specific HIF1\\u03b1 conditional knockout, acriflavine inhibition, AHR-ARNT co-IP, and an arthritis animal model with serum CRP measurement\",\n      \"pmids\": [\"31594926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous (non-drug) physiological role of AHR-ARNT control unclear\", \"Direct ARNT/AHR binding to CRP promoter not mapped\", \"Integration with IL-6/JAK/STAT not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated a CRP\\u2013IL-6 positive feedback loop in pancreatic neuroendocrine tumor cells, where IL-6 induces CRP and CRP enhances IL-6 secretion and invasion via ERK/AKT/STAT3.\",\n      \"evidence\": \"ELISA, Western blot for phospho-ERK/AKT/STAT3, flow cytometry, immunocytochemistry, and invasion/proliferation assays in BON1/QGP1 cells\",\n      \"pmids\": [\"31234146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab cell-line model\", \"Receptor mediating CRP uptake/signaling not identified\", \"Isoform responsible not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified CRP as a key serum opsonin of monosodium urate crystals, required for fixation of C1q/C1r/C1s/MASP1 and binding strongly enough to deplete CRP from serum.\",\n      \"evidence\": \"Affinity purification of MSU crystal-binding proteins, MS identification, complement fixation assay, and CRP depletion experiments\",\n      \"pmids\": [\"32286427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational state of CRP on crystals not defined\", \"Basis of non-uniform crystal-face binding unexplained\", \"In vivo gout relevance not directly tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed CRP non-redundantly drives classical complement activation on MSU crystals, fixing active C1 and producing C5a more efficiently than IgM.\",\n      \"evidence\": \"Complement activation assays measuring C4a/C3a/C5a in IgM- and/or CRP-depleted serum, with C1 fixation assay on crystals\",\n      \"pmids\": [\"35296708\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution to gout inflammation not established\", \"Isoform-specific contributions not separated\", \"Downstream cellular consequences of C5a not measured\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked CRP conformational isoforms to autoimmunity by detecting mCRP on extracellular vesicle surfaces in SLE, where mCRP+ EVs track with disease activity and anti-CRP autoantibodies.\",\n      \"evidence\": \"Flow cytometry of CRP isoforms on EVs and anti-mCRP ELISA in 67 SLE patients vs 60 controls\",\n      \"pmids\": [\"37356347\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-sectional correlation, not causal\", \"Mechanism of mCRP loading onto EVs unknown\", \"Pathogenic role of anti-mCRP antibodies not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CRP's conformational conversion (pCRP\\u2192mCRP) is regulated in vivo and integrated with its distinct receptor engagements remains the central open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo quantification of pCRP\\u2192mCRP conversion rates\", \"Definitive molecular identity and structure of the CRP\\u2013Fc\\u03b3R complex undefined\", \"How the multiple transcriptional regulators (IL-6/STAT, Sirt1-HNF1\\u03b1, AHR-HIF1\\u03b1) are integrated is unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 7, 8]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 4, 7, 8]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10, 11, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FCGR1A\", \"FCGR2A\", \"FCGR2B\", \"ITGAM\", \"ICAM1\", \"C1QA\", \"LEPR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}