{"gene":"CALU","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[],"current_model":"No mechanistic findings about CALU (calumenin) in the available literature (corpus is dominated by papers about Calu-1/Calu-3/Calu-6 lung cancer cell lines and large-scale proteomics datasets, none of which describe direct mechanistic experiments on the calumenin protein itself)."},"narrative":{"teleology":[],"mechanism_profile":null,"mechanistic_narrative":"No mechanistic findings about CALU (calumenin) in the available literature (corpus is dominated by papers about Calu-1/Calu-3/Calu-6 lung cancer cell lines and large-scale proteomics datasets, none of which describe direct mechanistic experiments on the calumenin protein itself)."},"prefetch_data":{"uniprot":{"accession":"O43852","full_name":"Calumenin","aliases":["Crocalbin","IEF SSP 9302"],"length_aa":315,"mass_kda":37.1,"function":"Involved in regulation of vitamin K-dependent carboxylation of multiple N-terminal glutamate residues. Seems to inhibit gamma-carboxylase GGCX. Binds 7 calcium ions with a low affinity (By similarity)","subcellular_location":"Endoplasmic reticulum membrane; Golgi apparatus; Secreted; Melanosome; Sarcoplasmic reticulum lumen","url":"https://www.uniprot.org/uniprotkb/O43852/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CALU","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":[{"gene":"SAR1B","stoichiometry":0.2},{"gene":"TMED2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CALU","total_profiled":1310},"omim":[{"mim_id":"603420","title":"CALUMENIN; CALU","url":"https://www.omim.org/entry/603420"},{"mim_id":"602544","title":"PARKIN RBR E3 UBIQUITIN PROTEIN LIGASE; PRKN","url":"https://www.omim.org/entry/602544"},{"mim_id":"190070","title":"KRAS PROTOONCOGENE, GTPase; KRAS","url":"https://www.omim.org/entry/190070"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CALU"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O43852","domains":[{"cath_id":"-","chopping":"43-207_250-297","consensus_level":"medium","plddt":83.8542,"start":43,"end":297}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43852","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43852-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43852-F1-predicted_aligned_error_v6.png","plddt_mean":79.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CALU","jax_strain_url":"https://www.jax.org/strain/search?query=CALU"},"sequence":{"accession":"O43852","fasta_url":"https://rest.uniprot.org/uniprotkb/O43852.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43852/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43852"}},"corpus_meta":[{"pmid":"6308465","id":"PMC_6308465","title":"Structure of the Ki-ras gene of the human lung 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1994,\n      \"finding\": \"Calu-3 cells express functional CFTR Cl- channels in the apical membrane that mediate cAMP-dependent Cl- secretion; patch-clamp studies identified a 7.1 pS voltage-independent Cl- channel reactivated by PKA plus ATP, confirmed as CFTR; immunoprecipitation demonstrated CFTR protein presence.\",\n      \"method\": \"Patch-clamp electrophysiology, isotopic flux (iodide efflux), immunoprecipitation, basolateral membrane permeabilization with nystatin\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (patch-clamp, flux, IP) in two independent papers from the same year\",\n      \"pmids\": [\"7515578\", \"7515579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Ca2+-stimulated Cl- secretion in Calu-3 serous airway cells requires CFTR as the exclusive apical Cl- conductance pathway; elevated [Ca2+]i increases basolateral K+ conductance to drive Cl- through constitutively open CFTR channels rather than activating a separate Ca2+-activated Cl- channel.\",\n      \"method\": \"Ussing chamber short-circuit current, basolateral membrane permeabilization, ion substitution, pharmacological inhibition (DPAC, DIDS, bumetanide, Ba2+, quinidine)\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution of ion gradients after basolateral permeabilization plus pharmacological dissection; strong mechanistic conclusion\",\n      \"pmids\": [\"9435576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The major component of basal short-circuit current in Calu-3 cells is HCO3- secretion, not Cl- secretion; isotopic flux measurements of 36Cl- and 22Na+ showed virtually no Cl- secretion or Na+ absorption under basal conditions, while cAMP stimulation recruits Cl- secretion.\",\n      \"method\": \"Isotopic flux measurements (36Cl-, 22Na+), short-circuit current under voltage-clamp\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct isotopic flux quantification resolving prior controversy; clear mechanistic conclusion\",\n      \"pmids\": [\"9530182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"PKC-epsilon is the specific PKC isotype required for cAMP-dependent CFTR channel activation in Calu-3 airway epithelial cells; antisense knockdown of PKC-epsilon prevented epinephrine-stimulated CFTR activity and reduced PKC-epsilon mass by 76%, without affecting PKA activity or other PKC isotypes.\",\n      \"method\": \"Antisense oligonucleotide knockdown, 36Cl- efflux assay, immunoblot for PKC isotypes\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — antisense knockdown with multiple orthogonal readouts; selective PKC-epsilon effect confirmed by control isotype antisense\",\n      \"pmids\": [\"9814985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Calu-3 cells secrete both HCO3- and Cl- via distinct mechanisms: forskolin stimulates electrogenic HCO3- secretion via a DNDS-sensitive, Cl--independent, Na+-dependent, bumetanide-insensitive mechanism, while 1-EBIO activates basolateral IK (intermediate-conductance) K+ channels (charybdotoxin/clotrimazole-sensitive), hyperpolarizes the membrane, inhibits NBC-mediated HCO3- entry, and switches secretion to bumetanide-sensitive Cl- secretion.\",\n      \"method\": \"Ussing chamber transepithelial currents, isotopic flux, ion substitution, pharmacology, nystatin permeabilization, patch-clamp\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — comprehensive reconstitution with multiple orthogonal methods establishing a mechanistic switch between HCO3- and Cl- secretion\",\n      \"pmids\": [\"10228185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CFTR is the major apical anion conductance pathway in Calu-3 cells with a limiting pore diameter of ~0.53 nm; anion selectivity sequence (Br≥Cl≥NO3>SCN>I≥F>formate>HCO3-) matches heterologously expressed CFTR; a parallel cAMP-independent pathway (likely tight junctions) shows different selectivity.\",\n      \"method\": \"Basolateral membrane permeabilization with alpha-toxin, transepithelial current with ion gradients, pharmacological inhibition\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biophysical characterization with gradient-driven currents and multiple anion substitutions\",\n      \"pmids\": [\"10370058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"4-phenylbutyrate (PBA) at high concentration (5 mM) increases CFTR protein expression 6-10 fold at the apical membrane yet paradoxically inhibits CFTR Cl- currents across the apical membrane in Calu-3 cells; lower therapeutic concentrations (0.05-2 mM) have no negative effect on cAMP-stimulated Cl- secretion.\",\n      \"method\": \"Short-circuit current, CFTR protein quantification, surface biotinylation, CFTR immunostaining\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional and biochemical measurements, single lab\",\n      \"pmids\": [\"10516210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PKC-epsilon selectively regulates CFTR function while PKC-delta selectively regulates NKCC1 function in Calu-3 airway epithelial cells; antisense knockdown of PKC-epsilon reduced cAMP-dependent CFTR activation without affecting alpha1-adrenergic NKCC1 activation, while PKC-delta antisense blocked NKCC1 activation without affecting CFTR.\",\n      \"method\": \"Antisense oligonucleotide knockdown, 36Cl- efflux (CFTR), 86Rb flux (NKCC1), RT-PCR, Western blot\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — differential antisense knockdown with functional transport assays for both transporters\",\n      \"pmids\": [\"11238015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MDR1/P-glycoprotein is localized to the basolateral membrane of Calu-3 cells (not apical), mediating active apical-to-basolateral transport of flunisolide; transport was ATP-dependent and blocked by PSC 833, verapamil, and LY335979; MRP1 is also expressed with basolateral localization.\",\n      \"method\": \"Transepithelial transport assay, Western blot, confocal microscopy, metabolic inhibition (4°C, 2-deoxyglucose/NaN3), mass spectrometry\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (transport, Western, confocal localization, metabolic inhibition); localization and functional consequence demonstrated\",\n      \"pmids\": [\"11724763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MRP1 is expressed at the basolateral membrane of Calu-3 cells and exhibits functional efflux activity (reduced by probenecid and indomethacin) that is subordinate to P-glycoprotein-mediated efflux at the apical membrane.\",\n      \"method\": \"RT-PCR, indirect fluorescence (membrane localization), calcein efflux assay, etoposide transport with selective inhibitors\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional and localization data from single lab\",\n      \"pmids\": [\"11504821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Pharmacologically distinct basolateral K+ channels differentially control basal, cAMP-stimulated, and Ca2+-stimulated anion secretion in Calu-3 cells: KCNN4 (clotrimazole-sensitive) contributes to Ca2+-stimulated secretion, while cAMP-stimulated secretion depends primarily on clofilium-sensitive channels (likely KCNQ1-containing); expression of KCNN4, KCNQ1, KCNE2, and KCNE3 confirmed by RT-PCR.\",\n      \"method\": \"Ussing chamber short-circuit current, pharmacological channel inhibitors, RT-PCR, basolateral membrane permeabilization\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection combined with gene expression in polarized epithelial monolayers; replicated across multiple secretagogue conditions\",\n      \"pmids\": [\"11826162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"H2O2-stimulated anion secretion across Calu-3 monolayers is CFTR-dependent (blocked by DPC) and requires cAMP-dependent PKA pathway (blocked by adenylate cyclase inhibitor SQ22536); basolateral K+ conductance (KCNN4 and KCNQ1) also contributes to the oxidant-stimulated response.\",\n      \"method\": \"Ussing chamber, pharmacological inhibitors, isolated apical/basolateral membrane conductance measurements\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway placement via adenylate cyclase inhibition and membrane isolation experiments\",\n      \"pmids\": [\"12181292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PP2A co-immunoprecipitates with NKCC1 and PKC-delta in Calu-3 cells; PP2A (not PP1) is the serine/threonine phosphatase regulating NKCC1 activity, with okadaic acid (PP2A inhibitor) increasing NKCC1 activity 4.1-fold; SPAK kinase also co-precipitates with PP2A and PKC-delta, suggesting a regulatory complex on actin scaffold.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown with recombinant NKCC1 N-terminus, 86Rb flux (NKCC1 activity), okadaic acid/calyculin dose-response, immunoblot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP, GST pulldown, and functional transport assay with selective phosphatase inhibitors in multiple cell systems\",\n      \"pmids\": [\"15899883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Intracellular pH in Calu-3 cells is regulated by Na+/H+ exchange (NHE; amiloride-sensitive) and an electroneutral Cl-/HCO3- exchanger (DNDS-sensitive, voltage-independent); RT-PCR detected NBC1 and AE2 but not NBCn1; the electroneutral exchanger and NHE contribute to HCO3- secretion mechanism.\",\n      \"method\": \"BCECF fluorescence intracellular pH measurement, NH4Cl pulse acidification, ion substitution, membrane potential manipulation (valinomycin, K+ channel opener), RT-PCR, direct microelectrode measurements\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple methods with direct membrane potential validation confirming electroneutral exchanger\",\n      \"pmids\": [\"11790817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Adenosine regulates CFTR Cl- channel activity in Calu-3 cells via A2A (basolateral) and A2B (apical and basolateral) receptors; hENT1 equilibrative nucleoside transporter controls extracellular adenosine concentration and thereby CFTR activity; adenosine kinase and 5'-nucleotidase modulate intracellular adenosine and CFTR through this pathway.\",\n      \"method\": \"RT-PCR, short-circuit current, uptake studies, whole-cell current, single-channel patch-clamp, pharmacological inhibitors (NBMPR, adenosine kinase inhibitor, 5'-nucleotidase inhibitor)\",\n      \"journal\": \"The Journal of membrane biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — single-channel confirmation of CFTR activation linked to nucleoside transporter function with multiple methods\",\n      \"pmids\": [\"12820662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CBIQ (4-chloro-benzo[F]isoquinoline) activates both CFTR Cl- channels (7 pS, glibenclamide-sensitive) and KCNN4 K+ channels (12 pS, clotrimazole-sensitive) in Calu-3 cells; confirmed by patch-clamp of isolated apical and basolateral membranes and whole-cell recording; electrogenic Cl- secretion verified by isotopic flux.\",\n      \"method\": \"Ussing chamber short-circuit current, isotopic 36Cl- flux, whole-cell patch-clamp, inside-out and cell-attached patch-clamp, apical/basolateral membrane permeabilization\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-channel characterization with multiple patch-clamp configurations plus macroscopic transport assays\",\n      \"pmids\": [\"15148241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Two-pore-domain K+ (K2P) channels including TREK-1 and TWIK-2 are expressed at the plasma membrane of Calu-3 cells and contribute to basal anion secretion; TASK-2 localizes to subapical vesicles; apical K+ channels (in addition to basolateral) participate in controlling transepithelial anion secretion.\",\n      \"method\": \"RT-PCR, Western blot, immunolocalization of polarized monolayers, short-circuit current with K+ channel inhibitors (bupivacaine, lidocaine, clofilium, quinidine, riluzole)\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — protein localization with functional pharmacological correlate; single lab\",\n      \"pmids\": [\"16311719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PAR-2 stimulation of Cl- secretion in Calu-3 cells occurs via an indirect mechanism: PAR-2 agonist (SLIGRL) elevates [Ca2+]i, stimulates prostaglandin (PGE2) synthesis via cyclooxygenase, and PGE2 then activates CFTR-dependent Cl- secretion; CFTR shRNA knockdown abolished the apical Cl- conductance increase; KCNN4 and KCNQ1 K+ channels also participate.\",\n      \"method\": \"Ussing chamber, QRT-PCR, BAPTA-AM Ca2+ chelation, indomethacin (COX inhibitor), PGE2 receptor antagonist, CFTR shRNA knockdown, apical Cl- conductance measurement\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic (shRNA) and pharmacological pathway dissection with multiple orthogonal approaches\",\n      \"pmids\": [\"16531569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Both pNBC1 and NBC4 (electrogenic Na+/HCO3- cotransporters) are expressed at the basolateral membrane of polarized Calu-3 cells, identified by RT-PCR, Western blot, and surface biotinylation, providing the basolateral HCO3- entry mechanism for vectorial HCO3- secretion.\",\n      \"method\": \"RT-PCR, Western blot, surface biotinylation\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — localization by biotinylation confirmed with two complementary biochemical methods; single lab\",\n      \"pmids\": [\"16857349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Calu-3 cells contain subapical mucin granules (MUC5AC) that undergo Ca2+-regulated exocytosis; nucleotide release (ATP and UDP-glucose) is co-secreted with mucin by the same Ca2+-regulated exocytic mechanism; neither mucin secretion nor ATP release was affected by CFTR activation or inhibition.\",\n      \"method\": \"Electron microscopy, real-time confocal microscopy (FM 1-43, quinacrine labeling), immunolocalization, slot blot for MUC5AC, luminescence ATP assay\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple imaging and biochemical methods establishing coordinated granule exocytosis mechanism\",\n      \"pmids\": [\"17656429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Multiple KCNQ subtypes (KCNQ1, KCNQ3, KCNQ5) are expressed and localize to the apical/lateral membrane of Calu-3 cells; XE991 (pan-KCNQ inhibitor) applied apically inhibits basal anion secretion more than chromanol 293B (KCNQ1 blocker alone), demonstrating that KCNQ3 and KCNQ5 at the apical membrane contribute to driving anion secretion.\",\n      \"method\": \"RT-PCR, Western blot, immunolocalization of polarized monolayers, Ussing chamber with chromanol 293B, XE991, linopiridine\",\n      \"journal\": \"The Journal of membrane biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — protein localization with pharmacological functional validation; single lab\",\n      \"pmids\": [\"18264812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VIP increases CFTR protein levels in the apical membrane of Calu-3 cells ~3.3-fold within 30 min via PKC-dependent reduction in CFTR endocytosis (not by increasing total CFTR or via PKA); PKC inhibitors (BisX, chelerythrine) blocked the effect while PKA inhibitor H89 did not; this increased surface CFTR enhanced iodide efflux during cAMP stimulation.\",\n      \"method\": \"Surface biotinylation, internalization assay, iodide efflux, phorbol ester mimicry, selective kinase inhibitors, tannic acid endosome recycling block\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection of PKC vs. PKA using multiple inhibitors with biochemical and functional readouts; single lab with strong internal controls\",\n      \"pmids\": [\"18650246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CFTR (via its NBD1 domain) interacts directly with S100A10/p11 by plasmon surface resonance; CFTR, ANXA1 (annexin-1), p11, and cPLA2alpha redistribute to detergent-resistant membrane (DRM) fractions upon TNF-alpha stimulation in Calu-3 cells; CFTR inhibition increases eicosanoid (PGE2, LTB4) production, indicating a complex involving CFTR modulates phospholipase A2 activity.\",\n      \"method\": \"Surface plasmon resonance (SPR) with NBD1 domain of CFTR, DRM fractionation, immunolocalization, CFTR inhibitors (Inh172, Gly-101), eicosanoid ELISA\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vitro binding by SPR plus cell-based DRM redistribution; single lab\",\n      \"pmids\": [\"19847291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AE2 (anion exchanger 2, SLC4A2) at the basolateral membrane of Calu-3 cells is a major pathway for basolateral Cl- loading during cAMP-stimulated secretion; AE2 knockdown (~90%) reduced cAMP-stimulated fluid secretion by ~70%, elevated secreted fluid pH and HCO3-, abolished basolateral Cl-/HCO3- exchange measured by pH-stat, and increased CFTR expression ~70% without affecting NKCC1 or NBCe1.\",\n      \"method\": \"Lentiviral shRNA knockdown, fluid secretion measurement, pH-stat for Cl-/HCO3- exchange, short-circuit/equivalent circuit current, Western blot, intracellular pH fluorescence\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic knockdown with multiple orthogonal transport and biochemical readouts; mechanistically rigorous\",\n      \"pmids\": [\"22802585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Calu-3 cells, HCO3- flux fully accounts for short-circuit current (I_sc) under voltage-clamp, but Cl- is the main secreted anion under open-circuit/physiological conditions; a novel HCO3--dependent mechanism of Cl- transport requires carbonic anhydrase activity; most HCO3- is recycled basolaterally via AE2-mediated exchange for Cl-, providing osmotic drive for fluid secretion.\",\n      \"method\": \"CFTR-deficient and CFTR-expressing matched Calu-3 lines, pH-stat for net HCO3- flux, ion substitution, carbonic anhydrase inhibition (acetazolamide), bafilomycin/ZnCl2 for H+ secretion, short-circuit and open-circuit current\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genetically matched CFTR+/- cell lines plus multiple biophysical methods establishing mechanistic model\",\n      \"pmids\": [\"22777674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COMMD1 binds to the C-terminal domain of NKCC1 (aa 1040-1212, with binding site on COMMD1 aa 1-47) in Calu-3 airway epithelial cells; this interaction regulates NKCC1 membrane expression and ubiquitination; COMMD1 siRNA knockdown reduced basal NKCC1 membrane expression, blunted hyperosmolarity-induced NKCC1 membrane trafficking, and decreased ubiquitinated NKCC1.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, myc-tagged CT-NKCC1 pulldown, co-immunoprecipitation of endogenous COMMD1, truncation mapping, siRNA knockdown, membrane expression assay, ubiquitination assay\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast two-hybrid confirmed by GST pulldown and Co-IP with functional consequences from siRNA in two cell systems\",\n      \"pmids\": [\"23515529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Dexamethasone increases mature wild-type CFTR protein expression ~2-fold at the cell surface of Calu-3 cells via a post-transcriptional cotranslational mechanism involving increased HSP90 binding (~1.55-fold) and decreased HSP70 binding (~0.30-fold) to CFTR, enhancing CFTR maturation.\",\n      \"method\": \"Real-time PCR (mRNA), Western blot, surface biotinylation, cycloheximide chase (protein stability), metabolic pulse-labeling, co-immunoprecipitation (HSP90/HSP70 with CFTR), mifepristone inhibition\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mechanistic chaperone interaction identified by Co-IP with pulse-labeling and cotranslational mechanism established\",\n      \"pmids\": [\"23272037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HMGB1 downregulates angulin-1/LSR expression in Calu-3 airway epithelial cells via TGF-beta signaling, leading to epithelial barrier disruption (increased permeability), upregulation of claudin-2, increased AMPK activity, and increased mitochondrial respiration; all effects were blocked by the TGF-beta type I receptor kinase inhibitor EW-7197.\",\n      \"method\": \"siRNA knockdown of angulin-1/LSR, HMGB1 treatment, TER measurement, immunofluorescence, Western blot, AMPK activity assay, mitochondrial respiration assay, EW-7197 pharmacological inhibition\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — siRNA and pharmacological intervention with multiple functional readouts; single lab\",\n      \"pmids\": [\"32423802\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CALU (as represented by the Calu-3 human airway serous cell model) mediates vectorial anion and fluid secretion through CFTR Cl-/HCO3- channels in the apical membrane driven by basolateral ion entry via NKCC1, AE2 (Cl-/HCO3- exchange), and electrogenic Na+/HCO3- cotransporters (pNBC1/NBC4), with CFTR activity regulated by PKA (cAMP), PKC-epsilon (constitutively active, required for cAMP responses), and surface expression controlled by VIP/PKC-dependent endocytosis and chaperones HSP90/HSP70; basolateral K+ channels (KCNN4, KCNQ family) provide the electrochemical driving force, with the balance between Cl- and HCO3- secretion determined by basolateral membrane potential and the activity of AE2-mediated Cl- recycling.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at this corpus, I need to identify papers about the canonical CALU protein (calumenin, a calcium-binding ER protein) vs. papers about:\n- Calu-1, Calu-3, Calu-6 **cell lines** (human lung cancer cell lines used as experimental models — NOT the CALU gene)\n- KRAS gene studies using Calu-1 cell line\n- General proteomics/interactome studies\n\nThe gene CALU encodes **calumenin**, a secreted calcium-binding protein of the CREC family, localized to the endoplasmic reticulum/secretory pathway. It is involved in vitamin K-dependent carboxylation and warfarin metabolism.\n\n**Classification:**\n- Papers about Calu-1, Calu-3, Calu-6 cell lines as airway epithelial/lung cancer models → EXCLUDE (these use cell lines named \"Calu\" but study CFTR, drug transport, etc., not the CALU protein)\n- Paper [1] (Ki-ras gene in Calu-1) → EXCLUDE (about KRAS)\n- Additional papers [1]-[30]: mostly large proteomics/interactome datasets — need to check if CALU protein appears as a specific finding\n- Additional paper [28] (warfarin dose/CALU association) → this mentions CALU in context of warfarin pathway (calumenin role in vitamin K carboxylation) — KEEP as it references CALU gene in a functional pathway context\n\nFrom the additional gene2pubmed-curated papers, most are large-scale proteomics studies. Paper [28] (PMID:17048007) specifically names CALU as involved in warfarin action/metabolism. The large interactome papers (BioPlex, etc.) may contain CALU as an identified interactor but provide no specific mechanistic finding about CALU itself from their abstracts.\n\nNone of the 100 retrieved papers describe mechanistic experiments specifically on the calumenin (CALU) protein. The gene2pubmed paper [28] associates CALU polymorphisms with warfarin dose but this is a GWAS/association study (exclude per rules). The large proteomics papers don't provide CALU-specific mechanistic findings in their abstracts.\n\n```json\n{\n  \"discoveries\": [],\n  \"current_model\": \"No mechanistic findings about CALU (calumenin) in the available literature (corpus is dominated by papers about Calu-1/Calu-3/Calu-6 lung cancer cell lines and large-scale proteomics datasets, none of which describe direct mechanistic experiments on the calumenin protein itself).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Calu-3 cells serve as a model of human airway serous epithelial secretion, in which CFTR is the exclusive apical anion conductance mediating both Cl⁻ and HCO₃⁻ secretion, with the secreted anion species determined by basolateral membrane potential and the activity of AE2-mediated Cl⁻/HCO₃⁻ exchange [PMID:9435576, PMID:22777674, PMID:22802585]. Basolateral HCO₃⁻ entry occurs via electrogenic Na⁺/HCO₃⁻ cotransporters (pNBC1, NBC4), while Cl⁻ entry proceeds through NKCC1 and AE2; basolateral K⁺ channels (KCNN4, KCNQ1/3/5) provide the electrochemical driving force, with pharmacologically distinct K⁺ channel subsets supporting basal, cAMP-, and Ca²⁺-stimulated secretion [PMID:10228185, PMID:11826162, PMID:16857349]. CFTR channel activation requires PKA signaling and a constitutively active PKC-ε, which selectively regulates CFTR independently of PKC-δ-dependent NKCC1 activation; CFTR surface expression is further controlled by VIP/PKC-dependent inhibition of endocytosis and by HSP90/HSP70 chaperone balance during biosynthetic maturation [PMID:9814985, PMID:11238015, PMID:18650246, PMID:23272037]. Under physiological open-circuit conditions, Cl⁻ is the predominant secreted anion despite HCO₃⁻ accounting for short-circuit current, because most apically secreted HCO₃⁻ is recycled basolaterally via AE2 exchange for Cl⁻, coupling carbonic anhydrase activity to osmotic fluid secretion [PMID:22777674, PMID:22802585].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing that CFTR is expressed and functional in Calu-3 cells resolved whether this serous cell line possessed a defined apical Cl⁻ channel, validating it as a native CFTR expression model for airway secretion studies.\",\n      \"evidence\": \"Patch-clamp identified a 7.1 pS PKA/ATP-dependent Cl⁻ channel; immunoprecipitation confirmed CFTR protein; iodide efflux and nystatin permeabilization demonstrated vectorial Cl⁻ transport.\",\n      \"pmids\": [\"7515578\", \"7515579\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular identity confirmation beyond pharmacological profile and IP at this stage\", \"Relative contribution of Cl⁻ vs. HCO₃⁻ secretion not yet examined\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrating that Ca²⁺-stimulated Cl⁻ secretion also proceeds exclusively through CFTR (not a separate CaCC) established CFTR as the sole apical anion exit pathway and redefined the role of Ca²⁺ signaling as acting on basolateral K⁺ channels rather than apical Cl⁻ channels.\",\n      \"evidence\": \"Ussing chamber with basolateral permeabilization and pharmacological dissection showed Ca²⁺ activates basolateral K⁺ conductance driving Cl⁻ through constitutively open CFTR.\",\n      \"pmids\": [\"9435576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of Ca²⁺-activated basolateral K⁺ channel not yet determined\", \"Whether other secretagogues also act exclusively through CFTR-mediated pathway unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Isotopic flux measurements revealed that basal transepithelial current is predominantly HCO₃⁻ secretion rather than Cl⁻ secretion, fundamentally redefining the nature of constitutive airway serous secretion and raising the question of how HCO₃⁻ enters the cell basolaterally.\",\n      \"evidence\": \"³⁶Cl⁻ and ²²Na⁺ fluxes under short-circuit showed negligible basal Cl⁻ secretion; cAMP stimulation recruited Cl⁻ secretion.\",\n      \"pmids\": [\"9530182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basolateral HCO₃⁻ entry mechanism not yet identified\", \"Whether HCO₃⁻ traverses CFTR directly or via another pathway not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying PKC-ε as the specific PKC isotype required for cAMP-dependent CFTR activation established that CFTR gating depends on a constitutive PKC-ε signal in addition to PKA, adding an unexpected regulatory layer.\",\n      \"evidence\": \"Antisense knockdown of PKC-ε abolished epinephrine-stimulated ³⁶Cl⁻ efflux without affecting PKA activity or other PKC isotypes.\",\n      \"pmids\": [\"9814985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation target of PKC-ε on CFTR not mapped\", \"Whether PKC-ε acts on CFTR directly or through an intermediary unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Comprehensive ion substitution and pharmacological reconstitution revealed a mechanistic switch between HCO₃⁻ and Cl⁻ secretion controlled by basolateral membrane potential: K⁺ channel activation (1-EBIO/KCNN4) hyperpolarizes the membrane, inhibits electrogenic NBC-mediated HCO₃⁻ entry, and shifts secretion from HCO₃⁻ to bumetanide-sensitive Cl⁻ secretion.\",\n      \"evidence\": \"Ussing chamber with isotopic flux, ion substitution, nystatin permeabilization, and patch-clamp in polarized Calu-3 monolayers.\",\n      \"pmids\": [\"10228185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the electrogenic NBC not yet confirmed at protein level\", \"In vivo relevance of this switch in submucosal gland secretion not tested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Differential antisense knockdown showed PKC-ε selectively regulates CFTR while PKC-δ selectively regulates NKCC1, revealing parallel but independent PKC signaling axes controlling the two major ion transport pathways.\",\n      \"evidence\": \"PKC-ε antisense blocked CFTR-dependent ³⁶Cl⁻ efflux without affecting ⁸⁶Rb flux (NKCC1); PKC-δ antisense had the reciprocal effect.\",\n      \"pmids\": [\"11238015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream substrates of PKC-δ on NKCC1 not identified\", \"Whether PKC-ε and PKC-δ are recruited to separate membrane microdomains unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Pharmacological dissection identified distinct basolateral K⁺ channel populations (KCNN4 for Ca²⁺-stimulated, KCNQ1-containing for cAMP-stimulated secretion) and established that the electrochemical driving force for anion secretion is differentially tuned by secretagogue-specific K⁺ channel activation.\",\n      \"evidence\": \"Ussing chamber with clotrimazole (KCNN4), clofilium (KCNQ), chromanol 293B (KCNQ1), and RT-PCR confirming KCNN4, KCNQ1, KCNE2, KCNE3 expression.\",\n      \"pmids\": [\"11826162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"KCNQ heteromer composition (KCNQ1/KCNE3 vs. KCNQ1/KCNE2) not resolved\", \"Apical vs. basolateral localization of each K⁺ channel subunit not determined at this stage\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of AE2 and NBC1 expression by RT-PCR and functional pH measurements established the basolateral transporters mediating Cl⁻/HCO₃⁻ exchange and intracellular pH regulation, providing candidate mechanisms for basolateral HCO₃⁻ loading.\",\n      \"evidence\": \"BCECF fluorescence pH measurement with NH₄Cl pulse, ion substitution, DNDS sensitivity, valinomycin membrane potential manipulation, and RT-PCR.\",\n      \"pmids\": [\"11790817\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protein-level localization of AE2 and NBC1 to basolateral membrane not yet confirmed\", \"Relative quantitative contributions of NBC vs. AE2 to HCO₃⁻ entry not determined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"PP2A was identified as the phosphatase regulating NKCC1 activity in a complex with PKC-δ and SPAK kinase, establishing a phosphorylation/dephosphorylation cycle controlling basolateral Cl⁻ entry.\",\n      \"evidence\": \"Co-IP and GST pulldown showed PP2A, PKC-δ, and SPAK co-associate with NKCC1; okadaic acid increased ⁸⁶Rb flux 4.1-fold.\",\n      \"pmids\": [\"15899883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific NKCC1 phosphorylation sites regulated by PP2A not mapped\", \"Actin scaffold involvement inferred but not directly demonstrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of pNBC1 and NBC4 proteins at the basolateral membrane by surface biotinylation confirmed the electrogenic Na⁺/HCO₃⁻ cotransporter identity inferred from earlier functional studies, completing the molecular inventory for basolateral HCO₃⁻ entry.\",\n      \"evidence\": \"RT-PCR, Western blot, and surface biotinylation of polarized Calu-3 monolayers.\",\n      \"pmids\": [\"16857349\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional contribution of NBC4 vs. pNBC1 not individually resolved\", \"Stoichiometry (1Na⁺:2HCO₃⁻ vs. 1Na⁺:3HCO₃⁻) not determined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"VIP was shown to increase apical CFTR surface density ~3.3-fold by PKC-dependent inhibition of endocytosis (not by increasing total CFTR or via PKA), revealing a trafficking-based mechanism for acute regulation of CFTR channel number at the apical membrane.\",\n      \"evidence\": \"Surface biotinylation, internalization assay, iodide efflux; PKC inhibitors blocked VIP effect while PKA inhibitor H89 did not; tannic acid endosome recycling block confirmed endocytic mechanism.\",\n      \"pmids\": [\"18650246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific PKC isotype mediating VIP-dependent endocytic regulation not identified\", \"Whether VIP acts on clathrin-dependent or caveolar endocytosis not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Genetic knockdown of AE2 and use of CFTR-deficient matched lines together established a unified secretion model: under physiological open-circuit conditions, HCO₃⁻ secreted apically through CFTR is recycled basolaterally via AE2 in exchange for Cl⁻, making Cl⁻ the predominant net secreted anion and coupling carbonic anhydrase activity to osmotic fluid secretion.\",\n      \"evidence\": \"AE2 shRNA reduced fluid secretion ~70% and abolished basolateral Cl⁻/HCO₃⁻ exchange by pH-stat; CFTR+/− matched lines with acetazolamide inhibition demonstrated carbonic anhydrase dependence.\",\n      \"pmids\": [\"22802585\", \"22777674\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this HCO₃⁻ recycling model applies in native submucosal gland serous cells in vivo not tested\", \"Role of intracellular carbonic anhydrase isoforms not specified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dexamethasone was shown to enhance CFTR maturation at the cotranslational level by shifting chaperone balance (increased HSP90, decreased HSP70 binding to CFTR), revealing a pharmacologically targetable step in CFTR biogenesis.\",\n      \"evidence\": \"Metabolic pulse-labeling, cycloheximide chase, and co-IP of HSP90/HSP70 with CFTR in Calu-3 cells treated with dexamethasone ± mifepristone.\",\n      \"pmids\": [\"23272037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HSP90/HSP70 ratio shift is a direct glucocorticoid receptor transcriptional effect or indirect not resolved\", \"Applicability to ΔF508-CFTR correction not demonstrated in this system\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"COMMD1 was identified as a direct binding partner of the NKCC1 C-terminal domain that regulates NKCC1 membrane expression and ubiquitination, adding a trafficking/degradation control node to the basolateral Cl⁻ entry pathway.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, co-IP of endogenous COMMD1; siRNA knockdown reduced basal NKCC1 membrane expression and hyperosmolarity-induced trafficking.\",\n      \"pmids\": [\"23515529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ubiquitin ligase recruited by COMMD1 to NKCC1 not identified\", \"Whether COMMD1 regulation of NKCC1 affects transepithelial secretion rates not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The integrated signaling and trafficking mechanisms controlling the balance between Cl⁻ and HCO₃⁻ secretion under physiological conditions in native airway serous cells remain to be validated in vivo, and the specific PKC isotype mediating VIP-dependent CFTR trafficking regulation has not been determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"In vivo validation of HCO₃⁻ recycling model in submucosal glands lacking\", \"PKC isotype specificity for VIP-regulated CFTR endocytosis unresolved\", \"Structural basis for PKC-ε interaction with CFTR unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 8, 18, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 2, 4, 23, 24]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 7, 14, 21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CFTR\",\n      \"NKCC1\",\n      \"KCNN4\",\n      \"KCNQ1\",\n      \"AE2\",\n      \"PKC-epsilon\",\n      \"PKC-delta\",\n      \"HSP90\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (refusal — no on-target evidence) ---\n"}