{"gene":"AQP5","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1998,"finding":"AQP5 protein is selectively localized to the apical membranes of corneal epithelial surface cells, acinar cell apical membranes and microvilli of intracellular secretory canaliculi in serous salivary glands, and apical membranes of type I pulmonary epithelial cells, as established by immunohistochemistry and immunoelectron microscopy.","method":"Immunohistochemistry and immunoelectron microscopy with affinity-purified anti-AQP5 antibody","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct subcellular localization by immunoelectron microscopy, replicated across multiple tissue types in a single focused study, consistent with multiple subsequent papers","pmids":["9755069"],"is_preprint":false},{"year":1999,"finding":"AQP5 protein in rat salivary glands is restricted to apical membranes including intercellular secretory canaliculi of acinar cells; upon isoproterenol (β-adrenergic) stimulation, apical AQP5 staining in parotid acinar cells redistributes to clustered dot patterns, suggesting dynamic membrane redistribution.","method":"Immunofluorescence microscopy with anti-AQP5 antibody; pharmacological stimulation with isoproterenol","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — immunofluorescence localization with pharmacological perturbation, single lab, consistent with broader literature on AQP5 trafficking","pmids":["10022971"],"is_preprint":false},{"year":1999,"finding":"AQP5 trafficking from intracellular vesicles to the plasma membrane requires elevation of intracellular Ca2+ (triggered by thapsigargin or Ca2+ ionophore A-23187) and depends on intact microtubules (colchicine/vinblastine sensitive) but is not completely inhibited by microfilament disruption (cytochalasin B).","method":"Confocal laser microscopy of AQP5-transfected HSG cells with pharmacological inhibitors of Ca2+ and cytoskeletal components","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-cell trafficking assay with multiple pharmacological perturbations, single lab","pmids":["10600522"],"is_preprint":false},{"year":2000,"finding":"AQP5 knockout mice do not show significantly reduced pilocarpine-stimulated tear secretion, providing direct experimental evidence against an essential non-redundant role for AQP5 in lacrimal gland fluid secretion.","method":"Knockout mouse model; in vivo tear volume measurement with microcapillary tubes before and after pilocarpine","journal":"Experimental eye research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with quantitative in vivo secretion phenotype; negative result is clearly established","pmids":["10870513"],"is_preprint":false},{"year":2005,"finding":"M3 muscarinic acetylcholine receptor activation (by cevimeline or Ca2+ ionophore A-23187) induces AQP5 trafficking from intracellular lipid raft-containing vesicles to the apical plasma membrane in rat parotid interlobular duct cells, followed by dissociation of AQP5 from lipid rafts on the apical membrane; this process is Ca2+-dependent.","method":"Immunofluorescence/immunoelectron microscopy, detergent solubility assay, discontinuous sucrose density gradient flotation, confocal microscopy","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical and morphological methods in a single rigorous study; pharmacological and Ca2+ mechanistic dissection","pmids":["16107506"],"is_preprint":false},{"year":2005,"finding":"Vasoactive intestinal polypeptide (VIP) induces translocation of AQP5 (but not AQP1) to the apical membrane in rat duodenal Brunner's gland cells via a PKA-dependent (H-89-sensitive), PKC-independent mechanism.","method":"Subcellular fractionation of duodenal slices, Western blot, immunohistochemistry; pharmacological inhibitors H-7, H-89, calphostin C; in vivo VIP injection","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — dose-response and time-course experiments with specific kinase inhibitors, combined in vitro and in vivo approaches, multiple orthogonal methods","pmids":["15650134"],"is_preprint":false},{"year":2006,"finding":"AQP5 and TRPV4 form a physical complex at the apical membrane of salivary acinar cells; AQP5 is required for hypotonicity-induced TRPV4 activation and regulatory volume decrease (RVD). Deletion of the AQP5 N-terminus suppresses TRPV4 activation and RVD. Hypotonicity increases co-association and surface expression of both proteins, effects blocked by actin depolymerization.","method":"Co-immunoprecipitation, knockout mice (AQP5-/- and TRPV4-/-), electrophysiology, Ca2+ imaging, cell volume measurements, N-terminal deletion mutant expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, two separate knockout mouse lines, multiple functional readouts, mutant dissection","pmids":["16571723"],"is_preprint":false},{"year":2007,"finding":"In AQP5-transfected bronchial epithelial cells, serine-156 (the PKA consensus site) is phosphorylated by PKA; the S156A mutant abolishes this phosphorylation. However, PKA phosphorylation of S156 does not regulate membrane targeting of AQP5. The N185D (NPA motif) mutant localizes predominantly to cytoplasm rather than apical membrane, indicating the NPA motif is required for membrane targeting.","method":"Stable transfection of BEAS-2B cells grown on permeable supports; phosphorylation assay; immunofluorescence; pharmacological PKA inhibition/activation (H89, cpt-cAMP)","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis combined with pharmacological dissection, single lab","pmids":["18042467"],"is_preprint":false},{"year":2008,"finding":"AQP5 requires membrane trafficking (N185D NPA-motif mutation blocks this) and phosphorylation on Ser156 (S156A mutant blocks this) for promoting cell invasion and epithelial-to-mesenchymal transition. AQP5 (but not mutants) binds activated c-Src (phospho-Tyr416) via SH3 domain interaction, as shown by protein array and immunoprecipitation, and induces spindle-like morphology and loss of epithelial markers.","method":"Stable transfection of BEAS-2B and NIH3T3 cells; in vitro invasion assay; SH3-domain protein array; immunoprecipitation; site-directed mutagenesis (N185D, S156A)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with functional assays and protein interaction studies, single lab","pmids":["18478076"],"is_preprint":false},{"year":2008,"finding":"AQP5 overexpression in K562 CML cells increases BCR-ABL1 phosphorylation, while AQP5 siRNA knockdown decreases BCR-ABL1 phosphorylation and increases caspase-9 activity, indicating AQP5 promotes proliferation and inhibits apoptosis partly through BCR-ABL1 signaling.","method":"Overexpression and siRNA knockdown in K562/LAMA84 cells; immunoblotting for BCR-ABL1 phosphorylation; flow cytometry caspase-9 activity assay; proliferation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with pathway readout, single lab","pmids":["18612408"],"is_preprint":false},{"year":2008,"finding":"AQP5 overexpression promotes oncogenic transformation and cell proliferation in a manner dependent on PKA-mediated phosphorylation of the Ser156 cAMP/PKA consensus site in its cytoplasmic loop.","method":"Ectopic expression of wild-type and PKA-site mutant AQP5 in cell lines; proliferation and transformation assays in vitro and in vivo","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis with functional proliferation/transformation readouts, single lab","pmids":["18423983"],"is_preprint":false},{"year":2008,"finding":"Parasympathetic (chorda tympani) denervation of rat submandibular gland reduces AQP5 protein level to ~37% of control without affecting AQP5 mRNA, indicating post-transcriptional/protein-level regulation. Cevimeline (M3 mAChR agonist) but not pilocarpine restores this loss; chloroquine (lysosomal inhibitor) prevents AQP5 degradation, and lysosomal extracts degrade AQP5 in vitro, implicating lysosomal degradation.","method":"Surgical denervation (parasympathectomy/sympathectomy); Western blot; RT-PCR; pharmacological rescue (cevimeline, pilocarpine, chloroquine); in vitro degradation assay with lysosomal fractions","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple complementary in vivo and in vitro approaches with pharmacological and biochemical mechanistic dissection, single lab but rigorous","pmids":["18450949"],"is_preprint":false},{"year":2009,"finding":"AQP5 conducts CO2 across cell membranes (as assessed by surface pH changes in Xenopus oocytes) but does not conduct NH3, exhibiting a higher CO2-to-NH3 selectivity ratio than AQP1 or AmtB.","method":"Surface pH measurements in Xenopus oocytes expressing rat AQP5; comparison with H2O-injected controls and other channels; osmotic water permeability (Pf) measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in Xenopus oocyte expression system with quantitative comparison to multiple controls and day-matched water-injected oocytes","pmids":["19273840"],"is_preprint":false},{"year":2009,"finding":"GFP-AQP5 mutants with unphosphorylatable substitutions at the PKA consensus motif (152SRRTS) show 1.5–2× greater translocation to the apical membrane in MDCK-II cells compared to wild-type GFP-AQP5, and this translocation is microtubule-dependent (colchicine-sensitive) but microfilament-independent (cytochalasin B-insensitive), indicating dephosphorylation of S152 promotes membrane targeting via microtubule-dependent transport.","method":"GFP-AQP5 chimeric protein expression in MDCK-II cells; site-directed mutagenesis of PKA motif; confocal microscopy; pharmacological inhibition (H-89, colchicine, cytochalasin B)","journal":"The journal of medical investigation : JMI","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with trafficking assay and cytoskeletal inhibitors, single lab","pmids":["19262015"],"is_preprint":false},{"year":2010,"finding":"LPS-induced downregulation of AQP5 mRNA in the parotid gland is mediated via activation of NF-κB and p-c-Jun/c-Fos (AP-1), which form a physical complex as shown by co-immunoprecipitation; specific kinase inhibitors for IKK, ERK1/2, JNK, and p38 MAPK each block LPS-induced AQP5 downregulation.","method":"In vivo LPS injection in TLR4-mutant and wild-type mice; pharmacological inhibitors; co-immunoprecipitation; gel-shift/binding assays on AQP5 promoter sequences; RT-PCR; Western blot","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors plus co-IP and promoter binding assays, single lab","pmids":["20522648"],"is_preprint":false},{"year":2010,"finding":"Following chorda tympani denervation, AQP5 protein in rat submandibular gland is degraded via lysosomal/autophagosomal pathways: LC3B-II (autophagosome marker) is transiently induced, AQP5 co-localizes with LAMP2 and LC3 in acinar cells, cathepsins B and L are identified as candidate degrading enzymes by inhibitor experiments.","method":"Immunohistochemistry, co-localization, TUNEL assay, Western blot for autophagy markers (LC3B-II, LAMP2, Bax, Bcl-2); in vitro AQP5-degrading activity assay with lysosomal fraction and protease inhibitors","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches including in vitro degradation assay with pharmacological inhibitors, single lab","pmids":["20689061"],"is_preprint":false},{"year":2011,"finding":"In streptozotocin-diabetic rats, M3 mAChR agonist cevimeline fails to induce AQP5 translocation to the apical plasma membrane of parotid acinar and duct cells (unlike in controls), and AQP5 protein is downregulated despite increased mRNA, contributing to diabetic xerostomia; insulin restoration tends to rescue cevimeline-induced AQP5 translocation.","method":"Western blot of subcellular fractions, immunohistochemistry, real-time PCR, detergent solubility assay in parotid glands of STZ-diabetic and insulin-treated rats","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation plus immunohistochemistry with disease model and pharmacological rescue, single lab","pmids":["21295117"],"is_preprint":false},{"year":2011,"finding":"AQP5 is expressed at the apical membrane of type-B intercalated cells (co-localizing with pendrin) throughout the collecting duct system in rat, mouse, and human kidney cortex; no basolateral AQP is detected in these cells, suggesting AQP5 is not involved in net transepithelial water reabsorption but may serve an osmosensory role.","method":"Immunocytochemistry with segment- and cell-type-specific markers (pendrin, V-type H+-ATPase) in human, rat and mouse kidney sections","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-species immunocytochemical co-localization with validated cell-type markers, single lab","pmids":["22178880"],"is_preprint":false},{"year":2012,"finding":"Caveolin-1 (Cav1) is required for agonist-stimulated apical targeting and surface expression of AQP5 in salivary gland acinar cells; in Cav1-/- mice, AQP5 apical localization is disrupted and agonist-induced AQP5 surface expression is reduced. TRPC1-mediated Ca2+ influx is necessary for agonist-stimulated AQP5 surface expression. Adenoviral re-expression of Cav1 restores normal AQP5 apical targeting and fluid secretion.","method":"Cav1 knockout mice; adenoviral Cav1 rescue; Ca2+ imaging; surface biotinylation; immunofluorescence; co-IP of TRPC1-STIM1","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout, viral rescue, multiple orthogonal methods linking Cav1, Ca2+ signaling and AQP5 localization to fluid secretion","pmids":["23203809"],"is_preprint":false},{"year":2013,"finding":"Dot1a (histone H3 K79 methyltransferase) represses AQP5 transcription; deletion of Dot1l in renal Aqp2-expressing cells markedly upregulates Aqp5. Human AQP5 physically interacts with AQP2 (co-IP) and impairs AQP2 cell surface localization; the AQP5/AQP2 complex partially resides in the ER/Golgi. Luciferase reporter and chromatin assays confirm Dot1a/H3 dimethyl-K79 association with the Aqp5 5' flanking region.","method":"cDNA array, real-time RT-qPCR, luciferase reporter assay, cell surface biotinylation, co-immunoprecipitation, colocalization, ChIP-like assays; conditional Dot1l knockout mice","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (reporter assay, ChIP, co-IP, biotinylation, KO mice) in a single study establishing transcriptional regulation and protein interaction","pmids":["23326416"],"is_preprint":false},{"year":2013,"finding":"Missense mutations in AQP5 cause autosomal-dominant diffuse nonepidermolytic palmoplantar keratoderma; immunofluorescence shows mutant AQP5 proteins traffic normally to the plasma membrane in stratum granulosum, suggesting the mutations alter channel regulation rather than trafficking.","method":"Exome sequencing; protein structure analysis; immunofluorescence of patient palmar epidermis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — human genetics with immunofluorescence localization, but functional channel properties not directly measured","pmids":["23830519"],"is_preprint":false},{"year":2013,"finding":"Hypoxia decreases AQP5 expression in mouse lung (~70%) via HIF-1α-dependent transcriptional repression; dominant-negative HIF-1α and HIF-1α siRNA block cobalt-induced AQP5 downregulation. Proteasome inhibitors abolish both hypoxia- and cobalt-induced AQP5 reduction at mRNA and protein level, implicating proteasome-dependent stabilization of HIF-1α and possibly other transcription factors.","method":"Hypoxia chamber experiments in mice; MLE-12 cell line; dominant-negative HIF-1α and HIF-1α siRNA; proteasome inhibitors (lactacystin, PI-III); hnRNA real-time PCR","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic (dominant-negative, siRNA) and pharmacological approaches, in vivo and in vitro, single lab","pmids":["23469202"],"is_preprint":false},{"year":2014,"finding":"AQP5 knockdown in HT-29 colon cancer cells increases p38 MAPK phosphorylation and enhances sensitivity to 5-FU and cisplatin, while decreasing expression of multidrug resistance proteins P-gp, GST-π, and TOPO II; p38 MAPK inhibitor phenocopies AQP5 knockdown, placing AQP5 upstream of p38 MAPK in drug resistance signaling.","method":"siRNA knockdown; cell viability assay (SRB); Western blot and RT-PCR for drug resistance factors and MAPK pathway components","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown plus pharmacological epistasis, single lab","pmids":["24752576"],"is_preprint":false},{"year":2015,"finding":"AQP5 forms functional, mercury-sensitive water channels in rodent lens fiber cells; the species-specific subcellular distribution (membranous in mouse, predominantly cytoplasmic in rat cortical fiber cells) determines whether AQP5 contributes measurably to osmotic water permeability (Pf). Organ culture causes insertion of rat AQP5 into cortical fiber membranes with a corresponding increase in Hg2+-sensitive Pf.","method":"Fluorescence dye dilution water permeability assay of membrane vesicles; HgCl2 inhibition; immunolabeling of lens sections and vesicles; organ culture","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct membrane vesicle water permeability assay with pharmacological inhibitor, in vitro reconstitution-like approach, single lab","pmids":["29118028"],"is_preprint":false},{"year":2015,"finding":"Muscarinic receptor activation in rat parotid acinar cells induces AQP5 translocation not only to the apical plasma membrane and lateral plasma membrane, but also to the nucleus and nuclear membrane; nuclear AQP5 is present in both soluble and insoluble nuclear fractions; nuclear size decreases when AQP5 is present in the nuclear membrane, suggesting AQP5 facilitates water movement across the nuclear membrane.","method":"Immunoconfocal and immunoelectron microscopy; Western blot of isolated nuclear and nuclear membrane fractions; sucrose-density flotation; detergent solubility assays; pharmacological (atropine) blocking","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal subcellular fractionation and imaging methods, single lab","pmids":["25603543"],"is_preprint":false},{"year":2016,"finding":"Aqp5 knockout mice have significantly higher survival (56% vs 22%) after LPS injection compared to wild-type, with reduced neutrophil migration into peritoneum and lung; conversely, AQP5-overexpressing Jurkat cells show 2.4× greater SDF-1α-stimulated migration and neutrophils from AA-genotype (higher AQP5) individuals migrate faster than AC/CC-genotype cells, establishing AQP5 as a promoter of immune cell migration.","method":"Aqp5 knockout mice; LPS survival experiment; peritoneal/lung neutrophil counting; filter migration assay of human neutrophils; AQP5-overexpressing Jurkat cell migration; AQP5 expression after fMLP by RT-PCR/Western blot","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse survival + human primary cell migration assay + overexpression migration assay, multiple approaches but single lab","pmids":["27871297"],"is_preprint":false},{"year":2017,"finding":"GATA6 and Sp1 cooperatively activate Aqp5 transcription in alveolar type I cells; HDAC3 represses this activation by binding Sp1 and deacetylating histone H3 (not H4) at the Aqp5 promoter/enhancer; the co-activator/HAT p300 promotes Aqp5 expression by interacting with GATA6 and Sp1 and modulating H3 acetylation.","method":"HDAC inhibitor (SAHA) treatment; HDAC3 overexpression and knockdown; GATA6 and p300 knockdown/overexpression; luciferase reporter assays; ChIP-H3/H4 acetylation; co-IP of GATA6/Sp1/p300/HDAC3","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (reporter assay, ChIP, co-IP, gain- and loss-of-function) in a single study, mechanistically rigorous","pmids":["28615712"],"is_preprint":false},{"year":2017,"finding":"AQP5 knockdown in glioma cells (U87-MG, U251, LN229) reduces proliferation, increases apoptosis, suppresses migration, and decreases expression and phosphorylation of ERK1/2 and p38 MAPK but not JNK or AKT, placing AQP5 upstream of EGFR/ERK/p38 MAPK signaling.","method":"siRNA knockdown and overexpression; MTT proliferation assay; flow cytometry (apoptosis, cell cycle); scratch migration assay; Western blot for EGFR/ERK/p38 MAPK pathway proteins","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with multiple cellular and signaling readouts, single lab","pmids":["28404978"],"is_preprint":false},{"year":2017,"finding":"Hyperosmolarity-induced AQP5 upregulation in human corneal epithelial cells mediates increases in proinflammatory cytokine expression (IL-1β, IL-6, IL-8, TNF-α, caspase-1) and cell death through JNK1/2 MAPK activation; siRNA silencing of AQP5 or pharmacological JNK inhibition (SP600125) reduces these effects.","method":"siRNA AQP5 knockdown; Western blot; TUNEL assay; JNK inhibitor SP600125; real-time RT-PCR in primary and cell-line human corneal epithelial cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological epistasis, single lab, two cell model systems","pmids":["28680052"],"is_preprint":false},{"year":2020,"finding":"AQP5 marks pyloric stem cells in mouse and human stomach; Aqp5-creERT2 lineage tracing demonstrates that AQP5+ stem cells are a source of WNT-driven invasive gastric cancer in vivo; tumor-resident AQP5+ cells preferentially initiate organoid growth in vitro, indicating cancer stem cell activity.","method":"Comparative transcriptional profiling; Aqp5-creERT2 knock-in mouse model; lineage tracing; organoid growth assay; flow cytometry prospective isolation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic lineage-tracing mouse model with multiple orthogonal functional validations (in vivo tumorigenesis, in vitro organoid), rigorous study in Nature","pmids":["32025032"],"is_preprint":false},{"year":2021,"finding":"Prolactin-inducible protein (PIP) physically interacts with AQP5 in vitro, in mouse and human salivary glands; the interaction involves the AQP5 C-terminus and N-terminal domain of PIP (one PIP per AQP5 tetramer); PIP knockout mice show altered AQP5 distribution at the apical membrane of acinar cells, demonstrating PIP regulates AQP5 localization in salivary glands.","method":"Co-immunoprecipitation in vitro and from tissues; structural/interaction domain mapping; immunofluorescence of PIP-knockout mouse salivary glands and human minor salivary gland biopsies","journal":"Cells","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with domain mapping and knockout mouse functional validation, single lab but multiple orthogonal methods","pmids":["34440877"],"is_preprint":false},{"year":2021,"finding":"AQP5 knockout in mice causes AQP5 loss-associated lacrimal gland dysfunction via ER stress induction, lipid accumulation, and inflammatory chemokine upregulation (CXCL1, CXCL2, CCL5), reducing aqueous tear secretion by ~50%; quercetin treatment partially reverses ER stress and inflammation.","method":"AQP5-/- mice; TEM of ER structure; Western blot and qRT-PCR for ER stress markers, lipid metabolism genes, chemokines; Oil Red O staining; quercetin pharmacological intervention","journal":"Molecular vision","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse with multiple mechanistic readouts, single lab","pmids":["35002213"],"is_preprint":false},{"year":2021,"finding":"AQP5 loss-of-function (AQP5 knockout or L51P missense mutation) in mouse lens leads to mild lens opacity associated with downregulation of miR-124-3p.1 and consequent upregulation of vimentin (a direct miR-124-3p.1 target confirmed by dual-luciferase reporter assay); miR-124-3p.1 agomir reduces lens opacity and vimentin in both WT and AQP5-KO mice.","method":"CRISPR/Cas9 AQP5 knockout mice; whole exome sequencing (human family); dual-luciferase reporter assay; qRT-PCR, Western blot, immunofluorescence; organ culture; miR agomir treatment","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with luciferase validation and functional rescue, single lab","pmids":["33582182"],"is_preprint":false},{"year":2022,"finding":"AQP5 promotes gastric cancer stem cell (GC-CSC) tumorigenesis by activating autophagy (LC3I/LC3II conversion) and recruiting the E3 ubiquitin ligase TRIM21 to ULK1, inducing K63-linked ubiquitination of ULK1; AQP5 cooperates with LGR5 to synergistically promote GC-CSC malignant functions.","method":"Single-cell sequencing; transcriptome and proteomic analysis; mass spectrometry; co-IP; ubiquitination assay; sphere formation, proliferation, invasion, and in vivo tumorigenesis assays","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitination assay with functional loss-of-function experiments, single lab","pmids":["36372898"],"is_preprint":false},{"year":2024,"finding":"In salivary gland epithelial cells, reduced GPX4 leads to lipid ROS accumulation, which activates STAT4 phosphorylation and nuclear translocation; pSTAT4 binds the AQP5 promoter (confirmed by ChIP assay) and suppresses AQP5 transcription, reducing salivary secretion. GPX4 overexpression reverses this cascade.","method":"GPX4 overexpression/knockdown; ChIP assay for pSTAT4 at AQP5 promoter; lipid ROS inhibitor ferrostatin-1; in vivo SS mouse model; Western blot; immunofluorescence","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP assay directly demonstrating transcription factor binding to AQP5 promoter, combined with genetic gain/loss-of-function and in vivo validation, single lab","pmids":["38574973"],"is_preprint":false}],"current_model":"AQP5 is an apically localized membrane water channel that also conducts CO2 (but not NH3) and is regulated at multiple levels: transcriptionally by GATA6/Sp1/HDAC3/p300 and epigenetically by Dot1a-mediated H3K79 methylation and DNA methylation, while post-translationally its trafficking to the apical plasma membrane is triggered by intracellular Ca2+ via M3 muscarinic receptor activation and depends on lipid rafts, microtubules, and caveolin-1, with lysosomal/autophagic degradation under parasympathetic denervation; AQP5 physically interacts with TRPV4 (required for hypotonicity-induced Ca2+ entry and regulatory volume decrease), AQP2 (impairing its surface localization), and the PIP protein (directing apical localization in salivary glands), and its Ser156 phosphorylation by PKA links it to c-Src signaling to promote invasion and oncogenic transformation."},"narrative":{"mechanistic_narrative":"AQP5 is an apically localized membrane water channel that mediates transepithelial water movement in secretory and barrier epithelia, where it concentrates at apical membranes and secretory canaliculi of salivary acini, corneal epithelium, and type I pulmonary cells [PMID:9755069]. Beyond water, it functions as a selective gas channel, conducting CO2 but not NH3 with higher CO2/NH3 selectivity than AQP1 [PMID:19273840], and forms mercury-sensitive functional water channels whose contribution to osmotic permeability depends on its membrane versus cytoplasmic distribution [PMID:29118028]. Its surface delivery is dynamically gated: M3 muscarinic receptor activation drives Ca2+-dependent trafficking of AQP5 from intracellular lipid-raft vesicles to the apical membrane along microtubules [PMID:10600522, PMID:16107506], a process requiring caveolin-1 and TRPC1-mediated Ca2+ influx [PMID:23203809], while the NPA motif is required for membrane targeting and PKA phosphorylation of Ser156 in the cytoplasmic loop modulates trafficking and downstream signaling [PMID:18042467, PMID:19262015]. At the apical membrane AQP5 physically partners with TRPV4 to enable hypotonicity-induced Ca2+ entry and regulatory volume decrease [PMID:16571723], with AQP2 to impair its surface localization [PMID:23326416], and with prolactin-inducible protein (PIP), which directs its apical distribution in salivary glands [PMID:34440877]. AQP5 expression is controlled transcriptionally and epigenetically by GATA6/Sp1 with HDAC3 repression and p300 coactivation [PMID:28615712], by Dot1a-mediated H3K79 methylation [PMID:23326416], and by repressive pSTAT4 acting downstream of GPX4/lipid-ROS signaling [PMID:38574973], while protein levels are set post-translationally by lysosomal and autophagic degradation following parasympathetic denervation [PMID:18450949, PMID:20689061]. AQP5 contributes to fluid secretion (its loss causing lacrimal dysfunction via ER stress and inflammation [PMID:35002213]), immune cell migration [PMID:27871297], and oncogenic behavior, where Ser156 phosphorylation links it to c-Src to promote invasion and transformation [PMID:18478076] and where AQP5 marks tumorigenic gastric stem cells driving WNT-driven invasive cancer [PMID:32025032]. Missense mutations in AQP5 cause autosomal-dominant diffuse nonepidermolytic palmoplantar keratoderma [PMID:23830519].","teleology":[{"year":1998,"claim":"Established where AQP5 protein resides in tissues, defining it as an apical water channel of secretory and barrier epithelia rather than a basolateral or ubiquitous one.","evidence":"Immunohistochemistry and immunoelectron microscopy across cornea, salivary gland, and lung","pmids":["9755069"],"confidence":"High","gaps":["Localization alone does not establish water-transport function in situ","Does not address regulation of trafficking"]},{"year":1999,"claim":"Showed AQP5 localization is dynamic and that Ca2+ and microtubules drive its vesicle-to-membrane trafficking, reframing it as a regulated rather than constitutive channel.","evidence":"Immunofluorescence with β-adrenergic stimulation in rat parotid; live-cell trafficking in AQP5-transfected HSG cells with Ca2+ and cytoskeletal inhibitors","pmids":["10022971","10600522"],"confidence":"Medium","gaps":["Receptor coupling not identified at this stage","Molecular machinery of vesicle docking unresolved"]},{"year":2000,"claim":"Tested whether AQP5 is non-redundantly required for fluid secretion in the lacrimal gland, finding it dispensable for pilocarpine-stimulated tear secretion.","evidence":"AQP5 knockout mice with in vivo tear volume measurement","pmids":["10870513"],"confidence":"High","gaps":["Negative result may reflect compensation by other AQPs","Later work found other lacrimal phenotypes (#31)"]},{"year":2005,"claim":"Defined the upstream receptor signaling for AQP5 trafficking, showing M3 muscarinic and VIP/PKA pathways drive Ca2+-dependent apical insertion from lipid-raft vesicles.","evidence":"Detergent solubility, sucrose flotation, and microscopy in rat parotid duct cells; subcellular fractionation in duodenal Brunner's glands with kinase inhibitors","pmids":["16107506","15650134"],"confidence":"High","gaps":["Direct link between receptor and vesicle machinery not mapped","Lipid-raft dissociation mechanism unresolved"]},{"year":2006,"claim":"Identified AQP5–TRPV4 as a functional complex coupling water permeability to osmosensing and regulatory volume decrease.","evidence":"Reciprocal co-IP, AQP5-/- and TRPV4-/- mice, electrophysiology, Ca2+ imaging, N-terminal deletion mutant","pmids":["16571723"],"confidence":"High","gaps":["Structural basis of the interaction not defined","Whether the complex forms in non-salivary tissues unknown"]},{"year":2007,"claim":"Dissected the roles of conserved motifs, showing the NPA motif is required for membrane targeting whereas PKA phosphorylation of Ser156 does not control basal trafficking.","evidence":"Site-directed mutagenesis (N185D, S156A) and PKA pharmacology in BEAS-2B cells","pmids":["18042467"],"confidence":"Medium","gaps":["Functional role of Ser156 phosphorylation left open here","Single cell-type system"]},{"year":2008,"claim":"Connected AQP5 to oncogenic signaling, showing Ser156 phosphorylation and membrane trafficking are required for c-Src binding, invasion, EMT, proliferation, and transformation.","evidence":"Mutagenesis with invasion/transformation assays, SH3 protein array, and IP in BEAS-2B/NIH3T3 and CML cells","pmids":["18478076","18423983","18612408"],"confidence":"Medium","gaps":["Mechanistic link between a water channel and kinase signaling not fully explained","Single-lab cell-line studies"]},{"year":2009,"claim":"Established AQP5 as a selective CO2 channel and refined the phosphorylation-trafficking relationship, showing dephosphorylation of the PKA motif promotes microtubule-dependent apical targeting.","evidence":"Surface pH and Pf measurements in Xenopus oocytes; GFP-AQP5 mutant trafficking in MDCK-II cells","pmids":["19273840","19262015"],"confidence":"Medium","gaps":["Physiological significance of CO2 conduction in vivo not established","Phosphatase responsible for dephosphorylation unidentified"]},{"year":2010,"claim":"Defined inflammatory and degradative regulation, showing LPS represses AQP5 transcription via NF-κB/AP-1 and that denervation triggers lysosomal/autophagic AQP5 degradation.","evidence":"In vivo LPS in TLR4-mutant mice with co-IP and promoter binding; denervation with LC3B-II, LAMP2 colocalization and cathepsin inhibitor assays","pmids":["20522648","20689061"],"confidence":"Medium","gaps":["Direct ubiquitin/autophagy adaptor for AQP5 not identified","Promoter binding assays were not full ChIP"]},{"year":2011,"claim":"Extended AQP5 biology to disease and unexpected tissue, linking impaired cevimeline-induced trafficking to diabetic xerostomia and identifying AQP5 in renal type-B intercalated cells.","evidence":"STZ-diabetic rat parotid fractionation and immunohistochemistry; multi-species kidney immunocytochemistry","pmids":["21295117","22178880"],"confidence":"Medium","gaps":["Renal osmosensory role inferred, not functionally tested","Insulin rescue mechanism unresolved"]},{"year":2013,"claim":"Uncovered epigenetic transcriptional repression by Dot1a/H3K79 methylation, an AQP5–AQP2 inhibitory interaction, hypoxic HIF-1α repression, and a causative human disease link.","evidence":"Reporter, ChIP, co-IP and conditional Dot1l KO mice; hypoxia/cobalt with DN-HIF-1α and proteasome inhibitors; exome sequencing of palmoplantar keratoderma families","pmids":["23326416","23469202","23830519"],"confidence":"High","gaps":["Functional channel consequence of keratoderma mutations not measured","How AQP5 retains AQP2 intracellularly mechanistically unclear"]},{"year":2014,"claim":"Placed AQP5 upstream of stress-MAPK signaling in cancer drug resistance, with knockdown sensitizing colon cancer cells to chemotherapy.","evidence":"siRNA knockdown with viability, drug-resistance protein, and p38 MAPK epistasis in HT-29 cells","pmids":["24752576"],"confidence":"Medium","gaps":["Direct molecular link between AQP5 and p38 unknown","Single cell line"]},{"year":2015,"claim":"Demonstrated lens water-channel function and nuclear/lateral trafficking, showing AQP5's measurable permeability contribution depends on membrane insertion and that it can localize to the nuclear membrane.","evidence":"Membrane vesicle Pf with Hg2+ inhibition in lens; immunoconfocal/EM and nuclear fractionation in rat parotid","pmids":["29118028","25603543"],"confidence":"Medium","gaps":["Functional role of nuclear AQP5 beyond nuclear size change unclear","Species differences in distribution mechanistically unexplained"]},{"year":2016,"claim":"Established AQP5 as a promoter of immune cell migration, with knockout improving LPS survival and overexpression enhancing chemotactic migration.","evidence":"Aqp5 KO mouse LPS survival, neutrophil counts, and human/Jurkat migration assays","pmids":["27871297"],"confidence":"Medium","gaps":["Mechanism linking water transport to migration not defined","Genotype association is correlative"]},{"year":2017,"claim":"Resolved the GATA6/Sp1/HDAC3/p300 transcriptional circuit governing AQP5 and extended AQP5–MAPK signaling to glioma and corneal inflammation.","evidence":"Reporter, ChIP, co-IP and gain/loss-of-function for transcription factors; siRNA and MAPK pharmacology in glioma and corneal epithelial cells","pmids":["28615712","28404978","28680052"],"confidence":"Medium","gaps":["How AQP5 mechanistically engages EGFR/ERK/p38 unresolved","Inflammation findings tissue-specific"]},{"year":2020,"claim":"Identified AQP5 as a marker of pyloric stem cells with cancer stem cell activity, providing in vivo evidence it labels the origin of WNT-driven invasive gastric cancer.","evidence":"Aqp5-creERT2 lineage tracing, organoid assays, and prospective isolation in mouse and human stomach","pmids":["32025032"],"confidence":"High","gaps":["Whether AQP5 channel activity is functionally required for stemness not tested here","Causal driver versus marker distinction"]},{"year":2021,"claim":"Characterized PIP as a direct AQP5 partner controlling apical localization and defined additional knockout phenotypes in lacrimal gland and lens.","evidence":"Co-IP with domain mapping and PIP-KO mice; AQP5-/- ER stress/inflammation analysis; CRISPR AQP5 KO with miR-124-3p.1/vimentin luciferase validation","pmids":["34440877","35002213","33582182"],"confidence":"Medium","gaps":["How PIP binding directs trafficking mechanistically unresolved","Link between AQP5 loss and miR-124-3p.1 downregulation indirect"]},{"year":2022,"claim":"Connected AQP5 to autophagy-driven gastric cancer stemness via TRIM21-mediated K63 ubiquitination of ULK1 and cooperation with LGR5.","evidence":"Single-cell/proteomic profiling, mass spectrometry, co-IP, ubiquitination and tumorigenesis assays","pmids":["36372898"],"confidence":"Medium","gaps":["How AQP5 recruits TRIM21 to ULK1 not structurally defined","Single-lab cancer model"]},{"year":2024,"claim":"Established a GPX4/lipid-ROS/STAT4 axis directly repressing AQP5 transcription, linking ferroptotic redox stress to impaired salivary secretion.","evidence":"GPX4 gain/loss-of-function, ChIP of pSTAT4 at the AQP5 promoter, ferrostatin-1, and in vivo Sjögren model","pmids":["38574973"],"confidence":"High","gaps":["Whether this axis operates in non-salivary tissues unknown","Upstream trigger of GPX4 reduction not defined"]},{"year":null,"claim":"How AQP5's water/CO2-conducting activity is mechanistically coupled to its signaling, migration-promoting, and cancer-stem-cell roles remains unresolved.","evidence":"No timeline study reconciles channel function with the kinase, autophagy, and stemness phenotypes","pmids":[],"confidence":"Low","gaps":["No structural model integrating channel and protein-interaction functions","Whether transport activity is required for oncogenic roles untested","Cross-tissue generality of regulatory circuits unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[12,23]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[12,23]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,6,18,30]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2,4]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[19,31]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[24]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[19,26,34]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[15,33]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[20,29]}],"complexes":[],"partners":["TRPV4","AQP2","PIP","CAV1","SRC","TRIM21"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P55064","full_name":"Aquaporin-5","aliases":[],"length_aa":265,"mass_kda":28.3,"function":"Aquaporins form homotetrameric transmembrane channels, with each monomer independently mediating water transport across the plasma membrane along its osmotic gradient (PubMed:18768791, PubMed:8621489). Plays an important role in fluid secretion in salivary glands (By similarity). Required for TRPV4 activation by hypotonicity. Together with TRPV4, controls regulatory volume decrease in salivary epithelial cells (PubMed:16571723). Seems to play a redundant role in water transport in the eye, lung and in sweat glands (By similarity)","subcellular_location":"Apical cell membrane; Cell membrane; Cytoplasmic vesicle membrane","url":"https://www.uniprot.org/uniprotkb/P55064/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AQP5","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AQP5","total_profiled":1310},"omim":[{"mim_id":"615598","title":"PALMOPLANTAR KERATODERMA, NAGASHIMA TYPE; PPKN","url":"https://www.omim.org/entry/615598"},{"mim_id":"605427","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY V, MEMBER 4; TRPV4","url":"https://www.omim.org/entry/605427"},{"mim_id":"602974","title":"AQUAPORIN 7; AQP7","url":"https://www.omim.org/entry/602974"},{"mim_id":"601383","title":"AQUAPORIN 6; AQP6","url":"https://www.omim.org/entry/601383"},{"mim_id":"600962","title":"PALMOPLANTAR KERATODERMA, NONEPIDERMOLYTIC; NEPPK","url":"https://www.omim.org/entry/600962"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"salivary gland","ntpm":586.3},{"tissue":"testis","ntpm":211.1}],"url":"https://www.proteinatlas.org/search/AQP5"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P55064","domains":[{"cath_id":"1.20.1080.10","chopping":"1-228","consensus_level":"medium","plddt":97.4179,"start":1,"end":228}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P55064","model_url":"https://alphafold.ebi.ac.uk/files/AF-P55064-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P55064-F1-predicted_aligned_error_v6.png","plddt_mean":94.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AQP5","jax_strain_url":"https://www.jax.org/strain/search?query=AQP5"},"sequence":{"accession":"P55064","fasta_url":"https://rest.uniprot.org/uniprotkb/P55064.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P55064/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P55064"}},"corpus_meta":[{"pmid":"19273840","id":"PMC_19273840","title":"Relative CO2/NH3 selectivities of AQP1, AQP4, AQP5, AmtB, and RhAG.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19273840","citation_count":208,"is_preprint":false},{"pmid":"16571723","id":"PMC_16571723","title":"A role for AQP5 in activation of TRPV4 by hypotonicity: concerted involvement of AQP5 and TRPV4 in regulation of cell volume recovery.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16571723","citation_count":194,"is_preprint":false},{"pmid":"10615063","id":"PMC_10615063","title":"Decreased expression of aquaporin (AQP)1 and AQP5 in mouse lung after acute viral infection.","date":"2000","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10615063","citation_count":183,"is_preprint":false},{"pmid":"10022971","id":"PMC_10022971","title":"Aquaporin-5 (AQP5), a water channel protein, in the rat salivary and lacrimal glands: immunolocalization and effect of secretory stimulation.","date":"1999","source":"Cell and tissue research","url":"https://pubmed.ncbi.nlm.nih.gov/10022971","citation_count":160,"is_preprint":false},{"pmid":"12801959","id":"PMC_12801959","title":"Distribution of aquaporin water channels AQP1 and AQP5 in the ductal system of the human pancreas.","date":"2003","source":"Gut","url":"https://pubmed.ncbi.nlm.nih.gov/12801959","citation_count":137,"is_preprint":false},{"pmid":"9755069","id":"PMC_9755069","title":"Localization and expression of AQP5 in cornea, serous salivary glands, and pulmonary epithelial cells.","date":"1998","source":"The American journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/9755069","citation_count":135,"is_preprint":false},{"pmid":"18478076","id":"PMC_18478076","title":"Expression of aquaporin 5 (AQP5) promotes tumor invasion in human non small cell lung cancer.","date":"2008","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/18478076","citation_count":128,"is_preprint":false},{"pmid":"32025032","id":"PMC_32025032","title":"AQP5 enriches for stem cells and cancer origins in the distal stomach.","date":"2020","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/32025032","citation_count":110,"is_preprint":false},{"pmid":"16107506","id":"PMC_16107506","title":"Identification of AQP5 in lipid rafts and its translocation to apical membranes by activation of M3 mAChRs in interlobular ducts of rat parotid gland.","date":"2005","source":"American journal of physiology. 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Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical and morphological methods in a single rigorous study; pharmacological and Ca2+ mechanistic dissection\",\n      \"pmids\": [\"16107506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Vasoactive intestinal polypeptide (VIP) induces translocation of AQP5 (but not AQP1) to the apical membrane in rat duodenal Brunner's gland cells via a PKA-dependent (H-89-sensitive), PKC-independent mechanism.\",\n      \"method\": \"Subcellular fractionation of duodenal slices, Western blot, immunohistochemistry; pharmacological inhibitors H-7, H-89, calphostin C; in vivo VIP injection\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dose-response and time-course experiments with specific kinase inhibitors, combined in vitro and in vivo approaches, multiple orthogonal methods\",\n      \"pmids\": [\"15650134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AQP5 and TRPV4 form a physical complex at the apical membrane of salivary acinar cells; AQP5 is required for hypotonicity-induced TRPV4 activation and regulatory volume decrease (RVD). Deletion of the AQP5 N-terminus suppresses TRPV4 activation and RVD. Hypotonicity increases co-association and surface expression of both proteins, effects blocked by actin depolymerization.\",\n      \"method\": \"Co-immunoprecipitation, knockout mice (AQP5-/- and TRPV4-/-), electrophysiology, Ca2+ imaging, cell volume measurements, N-terminal deletion mutant expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, two separate knockout mouse lines, multiple functional readouts, mutant dissection\",\n      \"pmids\": [\"16571723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In AQP5-transfected bronchial epithelial cells, serine-156 (the PKA consensus site) is phosphorylated by PKA; the S156A mutant abolishes this phosphorylation. However, PKA phosphorylation of S156 does not regulate membrane targeting of AQP5. The N185D (NPA motif) mutant localizes predominantly to cytoplasm rather than apical membrane, indicating the NPA motif is required for membrane targeting.\",\n      \"method\": \"Stable transfection of BEAS-2B cells grown on permeable supports; phosphorylation assay; immunofluorescence; pharmacological PKA inhibition/activation (H89, cpt-cAMP)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis combined with pharmacological dissection, single lab\",\n      \"pmids\": [\"18042467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AQP5 requires membrane trafficking (N185D NPA-motif mutation blocks this) and phosphorylation on Ser156 (S156A mutant blocks this) for promoting cell invasion and epithelial-to-mesenchymal transition. AQP5 (but not mutants) binds activated c-Src (phospho-Tyr416) via SH3 domain interaction, as shown by protein array and immunoprecipitation, and induces spindle-like morphology and loss of epithelial markers.\",\n      \"method\": \"Stable transfection of BEAS-2B and NIH3T3 cells; in vitro invasion assay; SH3-domain protein array; immunoprecipitation; site-directed mutagenesis (N185D, S156A)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with functional assays and protein interaction studies, single lab\",\n      \"pmids\": [\"18478076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AQP5 overexpression in K562 CML cells increases BCR-ABL1 phosphorylation, while AQP5 siRNA knockdown decreases BCR-ABL1 phosphorylation and increases caspase-9 activity, indicating AQP5 promotes proliferation and inhibits apoptosis partly through BCR-ABL1 signaling.\",\n      \"method\": \"Overexpression and siRNA knockdown in K562/LAMA84 cells; immunoblotting for BCR-ABL1 phosphorylation; flow cytometry caspase-9 activity assay; proliferation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with pathway readout, single lab\",\n      \"pmids\": [\"18612408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AQP5 overexpression promotes oncogenic transformation and cell proliferation in a manner dependent on PKA-mediated phosphorylation of the Ser156 cAMP/PKA consensus site in its cytoplasmic loop.\",\n      \"method\": \"Ectopic expression of wild-type and PKA-site mutant AQP5 in cell lines; proliferation and transformation assays in vitro and in vivo\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis with functional proliferation/transformation readouts, single lab\",\n      \"pmids\": [\"18423983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Parasympathetic (chorda tympani) denervation of rat submandibular gland reduces AQP5 protein level to ~37% of control without affecting AQP5 mRNA, indicating post-transcriptional/protein-level regulation. Cevimeline (M3 mAChR agonist) but not pilocarpine restores this loss; chloroquine (lysosomal inhibitor) prevents AQP5 degradation, and lysosomal extracts degrade AQP5 in vitro, implicating lysosomal degradation.\",\n      \"method\": \"Surgical denervation (parasympathectomy/sympathectomy); Western blot; RT-PCR; pharmacological rescue (cevimeline, pilocarpine, chloroquine); in vitro degradation assay with lysosomal fractions\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple complementary in vivo and in vitro approaches with pharmacological and biochemical mechanistic dissection, single lab but rigorous\",\n      \"pmids\": [\"18450949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AQP5 conducts CO2 across cell membranes (as assessed by surface pH changes in Xenopus oocytes) but does not conduct NH3, exhibiting a higher CO2-to-NH3 selectivity ratio than AQP1 or AmtB.\",\n      \"method\": \"Surface pH measurements in Xenopus oocytes expressing rat AQP5; comparison with H2O-injected controls and other channels; osmotic water permeability (Pf) measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in Xenopus oocyte expression system with quantitative comparison to multiple controls and day-matched water-injected oocytes\",\n      \"pmids\": [\"19273840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GFP-AQP5 mutants with unphosphorylatable substitutions at the PKA consensus motif (152SRRTS) show 1.5–2× greater translocation to the apical membrane in MDCK-II cells compared to wild-type GFP-AQP5, and this translocation is microtubule-dependent (colchicine-sensitive) but microfilament-independent (cytochalasin B-insensitive), indicating dephosphorylation of S152 promotes membrane targeting via microtubule-dependent transport.\",\n      \"method\": \"GFP-AQP5 chimeric protein expression in MDCK-II cells; site-directed mutagenesis of PKA motif; confocal microscopy; pharmacological inhibition (H-89, colchicine, cytochalasin B)\",\n      \"journal\": \"The journal of medical investigation : JMI\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with trafficking assay and cytoskeletal inhibitors, single lab\",\n      \"pmids\": [\"19262015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"LPS-induced downregulation of AQP5 mRNA in the parotid gland is mediated via activation of NF-κB and p-c-Jun/c-Fos (AP-1), which form a physical complex as shown by co-immunoprecipitation; specific kinase inhibitors for IKK, ERK1/2, JNK, and p38 MAPK each block LPS-induced AQP5 downregulation.\",\n      \"method\": \"In vivo LPS injection in TLR4-mutant and wild-type mice; pharmacological inhibitors; co-immunoprecipitation; gel-shift/binding assays on AQP5 promoter sequences; RT-PCR; Western blot\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors plus co-IP and promoter binding assays, single lab\",\n      \"pmids\": [\"20522648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Following chorda tympani denervation, AQP5 protein in rat submandibular gland is degraded via lysosomal/autophagosomal pathways: LC3B-II (autophagosome marker) is transiently induced, AQP5 co-localizes with LAMP2 and LC3 in acinar cells, cathepsins B and L are identified as candidate degrading enzymes by inhibitor experiments.\",\n      \"method\": \"Immunohistochemistry, co-localization, TUNEL assay, Western blot for autophagy markers (LC3B-II, LAMP2, Bax, Bcl-2); in vitro AQP5-degrading activity assay with lysosomal fraction and protease inhibitors\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches including in vitro degradation assay with pharmacological inhibitors, single lab\",\n      \"pmids\": [\"20689061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In streptozotocin-diabetic rats, M3 mAChR agonist cevimeline fails to induce AQP5 translocation to the apical plasma membrane of parotid acinar and duct cells (unlike in controls), and AQP5 protein is downregulated despite increased mRNA, contributing to diabetic xerostomia; insulin restoration tends to rescue cevimeline-induced AQP5 translocation.\",\n      \"method\": \"Western blot of subcellular fractions, immunohistochemistry, real-time PCR, detergent solubility assay in parotid glands of STZ-diabetic and insulin-treated rats\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation plus immunohistochemistry with disease model and pharmacological rescue, single lab\",\n      \"pmids\": [\"21295117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AQP5 is expressed at the apical membrane of type-B intercalated cells (co-localizing with pendrin) throughout the collecting duct system in rat, mouse, and human kidney cortex; no basolateral AQP is detected in these cells, suggesting AQP5 is not involved in net transepithelial water reabsorption but may serve an osmosensory role.\",\n      \"method\": \"Immunocytochemistry with segment- and cell-type-specific markers (pendrin, V-type H+-ATPase) in human, rat and mouse kidney sections\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-species immunocytochemical co-localization with validated cell-type markers, single lab\",\n      \"pmids\": [\"22178880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Caveolin-1 (Cav1) is required for agonist-stimulated apical targeting and surface expression of AQP5 in salivary gland acinar cells; in Cav1-/- mice, AQP5 apical localization is disrupted and agonist-induced AQP5 surface expression is reduced. TRPC1-mediated Ca2+ influx is necessary for agonist-stimulated AQP5 surface expression. Adenoviral re-expression of Cav1 restores normal AQP5 apical targeting and fluid secretion.\",\n      \"method\": \"Cav1 knockout mice; adenoviral Cav1 rescue; Ca2+ imaging; surface biotinylation; immunofluorescence; co-IP of TRPC1-STIM1\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout, viral rescue, multiple orthogonal methods linking Cav1, Ca2+ signaling and AQP5 localization to fluid secretion\",\n      \"pmids\": [\"23203809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dot1a (histone H3 K79 methyltransferase) represses AQP5 transcription; deletion of Dot1l in renal Aqp2-expressing cells markedly upregulates Aqp5. Human AQP5 physically interacts with AQP2 (co-IP) and impairs AQP2 cell surface localization; the AQP5/AQP2 complex partially resides in the ER/Golgi. Luciferase reporter and chromatin assays confirm Dot1a/H3 dimethyl-K79 association with the Aqp5 5' flanking region.\",\n      \"method\": \"cDNA array, real-time RT-qPCR, luciferase reporter assay, cell surface biotinylation, co-immunoprecipitation, colocalization, ChIP-like assays; conditional Dot1l knockout mice\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (reporter assay, ChIP, co-IP, biotinylation, KO mice) in a single study establishing transcriptional regulation and protein interaction\",\n      \"pmids\": [\"23326416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Missense mutations in AQP5 cause autosomal-dominant diffuse nonepidermolytic palmoplantar keratoderma; immunofluorescence shows mutant AQP5 proteins traffic normally to the plasma membrane in stratum granulosum, suggesting the mutations alter channel regulation rather than trafficking.\",\n      \"method\": \"Exome sequencing; protein structure analysis; immunofluorescence of patient palmar epidermis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — human genetics with immunofluorescence localization, but functional channel properties not directly measured\",\n      \"pmids\": [\"23830519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hypoxia decreases AQP5 expression in mouse lung (~70%) via HIF-1α-dependent transcriptional repression; dominant-negative HIF-1α and HIF-1α siRNA block cobalt-induced AQP5 downregulation. Proteasome inhibitors abolish both hypoxia- and cobalt-induced AQP5 reduction at mRNA and protein level, implicating proteasome-dependent stabilization of HIF-1α and possibly other transcription factors.\",\n      \"method\": \"Hypoxia chamber experiments in mice; MLE-12 cell line; dominant-negative HIF-1α and HIF-1α siRNA; proteasome inhibitors (lactacystin, PI-III); hnRNA real-time PCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic (dominant-negative, siRNA) and pharmacological approaches, in vivo and in vitro, single lab\",\n      \"pmids\": [\"23469202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AQP5 knockdown in HT-29 colon cancer cells increases p38 MAPK phosphorylation and enhances sensitivity to 5-FU and cisplatin, while decreasing expression of multidrug resistance proteins P-gp, GST-π, and TOPO II; p38 MAPK inhibitor phenocopies AQP5 knockdown, placing AQP5 upstream of p38 MAPK in drug resistance signaling.\",\n      \"method\": \"siRNA knockdown; cell viability assay (SRB); Western blot and RT-PCR for drug resistance factors and MAPK pathway components\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown plus pharmacological epistasis, single lab\",\n      \"pmids\": [\"24752576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AQP5 forms functional, mercury-sensitive water channels in rodent lens fiber cells; the species-specific subcellular distribution (membranous in mouse, predominantly cytoplasmic in rat cortical fiber cells) determines whether AQP5 contributes measurably to osmotic water permeability (Pf). Organ culture causes insertion of rat AQP5 into cortical fiber membranes with a corresponding increase in Hg2+-sensitive Pf.\",\n      \"method\": \"Fluorescence dye dilution water permeability assay of membrane vesicles; HgCl2 inhibition; immunolabeling of lens sections and vesicles; organ culture\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct membrane vesicle water permeability assay with pharmacological inhibitor, in vitro reconstitution-like approach, single lab\",\n      \"pmids\": [\"29118028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Muscarinic receptor activation in rat parotid acinar cells induces AQP5 translocation not only to the apical plasma membrane and lateral plasma membrane, but also to the nucleus and nuclear membrane; nuclear AQP5 is present in both soluble and insoluble nuclear fractions; nuclear size decreases when AQP5 is present in the nuclear membrane, suggesting AQP5 facilitates water movement across the nuclear membrane.\",\n      \"method\": \"Immunoconfocal and immunoelectron microscopy; Western blot of isolated nuclear and nuclear membrane fractions; sucrose-density flotation; detergent solubility assays; pharmacological (atropine) blocking\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal subcellular fractionation and imaging methods, single lab\",\n      \"pmids\": [\"25603543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Aqp5 knockout mice have significantly higher survival (56% vs 22%) after LPS injection compared to wild-type, with reduced neutrophil migration into peritoneum and lung; conversely, AQP5-overexpressing Jurkat cells show 2.4× greater SDF-1α-stimulated migration and neutrophils from AA-genotype (higher AQP5) individuals migrate faster than AC/CC-genotype cells, establishing AQP5 as a promoter of immune cell migration.\",\n      \"method\": \"Aqp5 knockout mice; LPS survival experiment; peritoneal/lung neutrophil counting; filter migration assay of human neutrophils; AQP5-overexpressing Jurkat cell migration; AQP5 expression after fMLP by RT-PCR/Western blot\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse survival + human primary cell migration assay + overexpression migration assay, multiple approaches but single lab\",\n      \"pmids\": [\"27871297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GATA6 and Sp1 cooperatively activate Aqp5 transcription in alveolar type I cells; HDAC3 represses this activation by binding Sp1 and deacetylating histone H3 (not H4) at the Aqp5 promoter/enhancer; the co-activator/HAT p300 promotes Aqp5 expression by interacting with GATA6 and Sp1 and modulating H3 acetylation.\",\n      \"method\": \"HDAC inhibitor (SAHA) treatment; HDAC3 overexpression and knockdown; GATA6 and p300 knockdown/overexpression; luciferase reporter assays; ChIP-H3/H4 acetylation; co-IP of GATA6/Sp1/p300/HDAC3\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (reporter assay, ChIP, co-IP, gain- and loss-of-function) in a single study, mechanistically rigorous\",\n      \"pmids\": [\"28615712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AQP5 knockdown in glioma cells (U87-MG, U251, LN229) reduces proliferation, increases apoptosis, suppresses migration, and decreases expression and phosphorylation of ERK1/2 and p38 MAPK but not JNK or AKT, placing AQP5 upstream of EGFR/ERK/p38 MAPK signaling.\",\n      \"method\": \"siRNA knockdown and overexpression; MTT proliferation assay; flow cytometry (apoptosis, cell cycle); scratch migration assay; Western blot for EGFR/ERK/p38 MAPK pathway proteins\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with multiple cellular and signaling readouts, single lab\",\n      \"pmids\": [\"28404978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hyperosmolarity-induced AQP5 upregulation in human corneal epithelial cells mediates increases in proinflammatory cytokine expression (IL-1β, IL-6, IL-8, TNF-α, caspase-1) and cell death through JNK1/2 MAPK activation; siRNA silencing of AQP5 or pharmacological JNK inhibition (SP600125) reduces these effects.\",\n      \"method\": \"siRNA AQP5 knockdown; Western blot; TUNEL assay; JNK inhibitor SP600125; real-time RT-PCR in primary and cell-line human corneal epithelial cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological epistasis, single lab, two cell model systems\",\n      \"pmids\": [\"28680052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AQP5 marks pyloric stem cells in mouse and human stomach; Aqp5-creERT2 lineage tracing demonstrates that AQP5+ stem cells are a source of WNT-driven invasive gastric cancer in vivo; tumor-resident AQP5+ cells preferentially initiate organoid growth in vitro, indicating cancer stem cell activity.\",\n      \"method\": \"Comparative transcriptional profiling; Aqp5-creERT2 knock-in mouse model; lineage tracing; organoid growth assay; flow cytometry prospective isolation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic lineage-tracing mouse model with multiple orthogonal functional validations (in vivo tumorigenesis, in vitro organoid), rigorous study in Nature\",\n      \"pmids\": [\"32025032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Prolactin-inducible protein (PIP) physically interacts with AQP5 in vitro, in mouse and human salivary glands; the interaction involves the AQP5 C-terminus and N-terminal domain of PIP (one PIP per AQP5 tetramer); PIP knockout mice show altered AQP5 distribution at the apical membrane of acinar cells, demonstrating PIP regulates AQP5 localization in salivary glands.\",\n      \"method\": \"Co-immunoprecipitation in vitro and from tissues; structural/interaction domain mapping; immunofluorescence of PIP-knockout mouse salivary glands and human minor salivary gland biopsies\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with domain mapping and knockout mouse functional validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"34440877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AQP5 knockout in mice causes AQP5 loss-associated lacrimal gland dysfunction via ER stress induction, lipid accumulation, and inflammatory chemokine upregulation (CXCL1, CXCL2, CCL5), reducing aqueous tear secretion by ~50%; quercetin treatment partially reverses ER stress and inflammation.\",\n      \"method\": \"AQP5-/- mice; TEM of ER structure; Western blot and qRT-PCR for ER stress markers, lipid metabolism genes, chemokines; Oil Red O staining; quercetin pharmacological intervention\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse with multiple mechanistic readouts, single lab\",\n      \"pmids\": [\"35002213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AQP5 loss-of-function (AQP5 knockout or L51P missense mutation) in mouse lens leads to mild lens opacity associated with downregulation of miR-124-3p.1 and consequent upregulation of vimentin (a direct miR-124-3p.1 target confirmed by dual-luciferase reporter assay); miR-124-3p.1 agomir reduces lens opacity and vimentin in both WT and AQP5-KO mice.\",\n      \"method\": \"CRISPR/Cas9 AQP5 knockout mice; whole exome sequencing (human family); dual-luciferase reporter assay; qRT-PCR, Western blot, immunofluorescence; organ culture; miR agomir treatment\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with luciferase validation and functional rescue, single lab\",\n      \"pmids\": [\"33582182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AQP5 promotes gastric cancer stem cell (GC-CSC) tumorigenesis by activating autophagy (LC3I/LC3II conversion) and recruiting the E3 ubiquitin ligase TRIM21 to ULK1, inducing K63-linked ubiquitination of ULK1; AQP5 cooperates with LGR5 to synergistically promote GC-CSC malignant functions.\",\n      \"method\": \"Single-cell sequencing; transcriptome and proteomic analysis; mass spectrometry; co-IP; ubiquitination assay; sphere formation, proliferation, invasion, and in vivo tumorigenesis assays\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitination assay with functional loss-of-function experiments, single lab\",\n      \"pmids\": [\"36372898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In salivary gland epithelial cells, reduced GPX4 leads to lipid ROS accumulation, which activates STAT4 phosphorylation and nuclear translocation; pSTAT4 binds the AQP5 promoter (confirmed by ChIP assay) and suppresses AQP5 transcription, reducing salivary secretion. GPX4 overexpression reverses this cascade.\",\n      \"method\": \"GPX4 overexpression/knockdown; ChIP assay for pSTAT4 at AQP5 promoter; lipid ROS inhibitor ferrostatin-1; in vivo SS mouse model; Western blot; immunofluorescence\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP assay directly demonstrating transcription factor binding to AQP5 promoter, combined with genetic gain/loss-of-function and in vivo validation, single lab\",\n      \"pmids\": [\"38574973\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AQP5 is an apically localized membrane water channel that also conducts CO2 (but not NH3) and is regulated at multiple levels: transcriptionally by GATA6/Sp1/HDAC3/p300 and epigenetically by Dot1a-mediated H3K79 methylation and DNA methylation, while post-translationally its trafficking to the apical plasma membrane is triggered by intracellular Ca2+ via M3 muscarinic receptor activation and depends on lipid rafts, microtubules, and caveolin-1, with lysosomal/autophagic degradation under parasympathetic denervation; AQP5 physically interacts with TRPV4 (required for hypotonicity-induced Ca2+ entry and regulatory volume decrease), AQP2 (impairing its surface localization), and the PIP protein (directing apical localization in salivary glands), and its Ser156 phosphorylation by PKA links it to c-Src signaling to promote invasion and oncogenic transformation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AQP5 is an apically localized membrane water channel that mediates transepithelial water movement in secretory and barrier epithelia, where it concentrates at apical membranes and secretory canaliculi of salivary acini, corneal epithelium, and type I pulmonary cells [#0]. Beyond water, it functions as a selective gas channel, conducting CO2 but not NH3 with higher CO2/NH3 selectivity than AQP1 [#12], and forms mercury-sensitive functional water channels whose contribution to osmotic permeability depends on its membrane versus cytoplasmic distribution [#23]. Its surface delivery is dynamically gated: M3 muscarinic receptor activation drives Ca2+-dependent trafficking of AQP5 from intracellular lipid-raft vesicles to the apical membrane along microtubules [#2, #4], a process requiring caveolin-1 and TRPC1-mediated Ca2+ influx [#18], while the NPA motif is required for membrane targeting and PKA phosphorylation of Ser156 in the cytoplasmic loop modulates trafficking and downstream signaling [#7, #13]. At the apical membrane AQP5 physically partners with TRPV4 to enable hypotonicity-induced Ca2+ entry and regulatory volume decrease [#6], with AQP2 to impair its surface localization [#19], and with prolactin-inducible protein (PIP), which directs its apical distribution in salivary glands [#30]. AQP5 expression is controlled transcriptionally and epigenetically by GATA6/Sp1 with HDAC3 repression and p300 coactivation [#26], by Dot1a-mediated H3K79 methylation [#19], and by repressive pSTAT4 acting downstream of GPX4/lipid-ROS signaling [#34], while protein levels are set post-translationally by lysosomal and autophagic degradation following parasympathetic denervation [#11, #15]. AQP5 contributes to fluid secretion (its loss causing lacrimal dysfunction via ER stress and inflammation [#31]), immune cell migration [#25], and oncogenic behavior, where Ser156 phosphorylation links it to c-Src to promote invasion and transformation [#8] and where AQP5 marks tumorigenic gastric stem cells driving WNT-driven invasive cancer [#29]. Missense mutations in AQP5 cause autosomal-dominant diffuse nonepidermolytic palmoplantar keratoderma [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established where AQP5 protein resides in tissues, defining it as an apical water channel of secretory and barrier epithelia rather than a basolateral or ubiquitous one.\",\n      \"evidence\": \"Immunohistochemistry and immunoelectron microscopy across cornea, salivary gland, and lung\",\n      \"pmids\": [\"9755069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Localization alone does not establish water-transport function in situ\", \"Does not address regulation of trafficking\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed AQP5 localization is dynamic and that Ca2+ and microtubules drive its vesicle-to-membrane trafficking, reframing it as a regulated rather than constitutive channel.\",\n      \"evidence\": \"Immunofluorescence with β-adrenergic stimulation in rat parotid; live-cell trafficking in AQP5-transfected HSG cells with Ca2+ and cytoskeletal inhibitors\",\n      \"pmids\": [\"10022971\", \"10600522\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor coupling not identified at this stage\", \"Molecular machinery of vesicle docking unresolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Tested whether AQP5 is non-redundantly required for fluid secretion in the lacrimal gland, finding it dispensable for pilocarpine-stimulated tear secretion.\",\n      \"evidence\": \"AQP5 knockout mice with in vivo tear volume measurement\",\n      \"pmids\": [\"10870513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Negative result may reflect compensation by other AQPs\", \"Later work found other lacrimal phenotypes (#31)\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the upstream receptor signaling for AQP5 trafficking, showing M3 muscarinic and VIP/PKA pathways drive Ca2+-dependent apical insertion from lipid-raft vesicles.\",\n      \"evidence\": \"Detergent solubility, sucrose flotation, and microscopy in rat parotid duct cells; subcellular fractionation in duodenal Brunner's glands with kinase inhibitors\",\n      \"pmids\": [\"16107506\", \"15650134\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct link between receptor and vesicle machinery not mapped\", \"Lipid-raft dissociation mechanism unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified AQP5–TRPV4 as a functional complex coupling water permeability to osmosensing and regulatory volume decrease.\",\n      \"evidence\": \"Reciprocal co-IP, AQP5-/- and TRPV4-/- mice, electrophysiology, Ca2+ imaging, N-terminal deletion mutant\",\n      \"pmids\": [\"16571723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the interaction not defined\", \"Whether the complex forms in non-salivary tissues unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Dissected the roles of conserved motifs, showing the NPA motif is required for membrane targeting whereas PKA phosphorylation of Ser156 does not control basal trafficking.\",\n      \"evidence\": \"Site-directed mutagenesis (N185D, S156A) and PKA pharmacology in BEAS-2B cells\",\n      \"pmids\": [\"18042467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of Ser156 phosphorylation left open here\", \"Single cell-type system\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected AQP5 to oncogenic signaling, showing Ser156 phosphorylation and membrane trafficking are required for c-Src binding, invasion, EMT, proliferation, and transformation.\",\n      \"evidence\": \"Mutagenesis with invasion/transformation assays, SH3 protein array, and IP in BEAS-2B/NIH3T3 and CML cells\",\n      \"pmids\": [\"18478076\", \"18423983\", \"18612408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between a water channel and kinase signaling not fully explained\", \"Single-lab cell-line studies\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established AQP5 as a selective CO2 channel and refined the phosphorylation-trafficking relationship, showing dephosphorylation of the PKA motif promotes microtubule-dependent apical targeting.\",\n      \"evidence\": \"Surface pH and Pf measurements in Xenopus oocytes; GFP-AQP5 mutant trafficking in MDCK-II cells\",\n      \"pmids\": [\"19273840\", \"19262015\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological significance of CO2 conduction in vivo not established\", \"Phosphatase responsible for dephosphorylation unidentified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined inflammatory and degradative regulation, showing LPS represses AQP5 transcription via NF-κB/AP-1 and that denervation triggers lysosomal/autophagic AQP5 degradation.\",\n      \"evidence\": \"In vivo LPS in TLR4-mutant mice with co-IP and promoter binding; denervation with LC3B-II, LAMP2 colocalization and cathepsin inhibitor assays\",\n      \"pmids\": [\"20522648\", \"20689061\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitin/autophagy adaptor for AQP5 not identified\", \"Promoter binding assays were not full ChIP\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended AQP5 biology to disease and unexpected tissue, linking impaired cevimeline-induced trafficking to diabetic xerostomia and identifying AQP5 in renal type-B intercalated cells.\",\n      \"evidence\": \"STZ-diabetic rat parotid fractionation and immunohistochemistry; multi-species kidney immunocytochemistry\",\n      \"pmids\": [\"21295117\", \"22178880\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Renal osmosensory role inferred, not functionally tested\", \"Insulin rescue mechanism unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Uncovered epigenetic transcriptional repression by Dot1a/H3K79 methylation, an AQP5–AQP2 inhibitory interaction, hypoxic HIF-1α repression, and a causative human disease link.\",\n      \"evidence\": \"Reporter, ChIP, co-IP and conditional Dot1l KO mice; hypoxia/cobalt with DN-HIF-1α and proteasome inhibitors; exome sequencing of palmoplantar keratoderma families\",\n      \"pmids\": [\"23326416\", \"23469202\", \"23830519\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional channel consequence of keratoderma mutations not measured\", \"How AQP5 retains AQP2 intracellularly mechanistically unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed AQP5 upstream of stress-MAPK signaling in cancer drug resistance, with knockdown sensitizing colon cancer cells to chemotherapy.\",\n      \"evidence\": \"siRNA knockdown with viability, drug-resistance protein, and p38 MAPK epistasis in HT-29 cells\",\n      \"pmids\": [\"24752576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between AQP5 and p38 unknown\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated lens water-channel function and nuclear/lateral trafficking, showing AQP5's measurable permeability contribution depends on membrane insertion and that it can localize to the nuclear membrane.\",\n      \"evidence\": \"Membrane vesicle Pf with Hg2+ inhibition in lens; immunoconfocal/EM and nuclear fractionation in rat parotid\",\n      \"pmids\": [\"29118028\", \"25603543\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of nuclear AQP5 beyond nuclear size change unclear\", \"Species differences in distribution mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established AQP5 as a promoter of immune cell migration, with knockout improving LPS survival and overexpression enhancing chemotactic migration.\",\n      \"evidence\": \"Aqp5 KO mouse LPS survival, neutrophil counts, and human/Jurkat migration assays\",\n      \"pmids\": [\"27871297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking water transport to migration not defined\", \"Genotype association is correlative\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the GATA6/Sp1/HDAC3/p300 transcriptional circuit governing AQP5 and extended AQP5–MAPK signaling to glioma and corneal inflammation.\",\n      \"evidence\": \"Reporter, ChIP, co-IP and gain/loss-of-function for transcription factors; siRNA and MAPK pharmacology in glioma and corneal epithelial cells\",\n      \"pmids\": [\"28615712\", \"28404978\", \"28680052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How AQP5 mechanistically engages EGFR/ERK/p38 unresolved\", \"Inflammation findings tissue-specific\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified AQP5 as a marker of pyloric stem cells with cancer stem cell activity, providing in vivo evidence it labels the origin of WNT-driven invasive gastric cancer.\",\n      \"evidence\": \"Aqp5-creERT2 lineage tracing, organoid assays, and prospective isolation in mouse and human stomach\",\n      \"pmids\": [\"32025032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AQP5 channel activity is functionally required for stemness not tested here\", \"Causal driver versus marker distinction\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Characterized PIP as a direct AQP5 partner controlling apical localization and defined additional knockout phenotypes in lacrimal gland and lens.\",\n      \"evidence\": \"Co-IP with domain mapping and PIP-KO mice; AQP5-/- ER stress/inflammation analysis; CRISPR AQP5 KO with miR-124-3p.1/vimentin luciferase validation\",\n      \"pmids\": [\"34440877\", \"35002213\", \"33582182\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How PIP binding directs trafficking mechanistically unresolved\", \"Link between AQP5 loss and miR-124-3p.1 downregulation indirect\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected AQP5 to autophagy-driven gastric cancer stemness via TRIM21-mediated K63 ubiquitination of ULK1 and cooperation with LGR5.\",\n      \"evidence\": \"Single-cell/proteomic profiling, mass spectrometry, co-IP, ubiquitination and tumorigenesis assays\",\n      \"pmids\": [\"36372898\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How AQP5 recruits TRIM21 to ULK1 not structurally defined\", \"Single-lab cancer model\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a GPX4/lipid-ROS/STAT4 axis directly repressing AQP5 transcription, linking ferroptotic redox stress to impaired salivary secretion.\",\n      \"evidence\": \"GPX4 gain/loss-of-function, ChIP of pSTAT4 at the AQP5 promoter, ferrostatin-1, and in vivo Sjögren model\",\n      \"pmids\": [\"38574973\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this axis operates in non-salivary tissues unknown\", \"Upstream trigger of GPX4 reduction not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AQP5's water/CO2-conducting activity is mechanistically coupled to its signaling, migration-promoting, and cancer-stem-cell roles remains unresolved.\",\n      \"evidence\": \"No timeline study reconciles channel function with the kinase, autophagy, and stemness phenotypes\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model integrating channel and protein-interaction functions\", \"Whether transport activity is required for oncogenic roles untested\", \"Cross-tissue generality of regulatory circuits unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [12, 23]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [12, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 6, 18, 30]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [19, 31]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [19, 26, 34]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [15, 33]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [20, 29]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TRPV4\", \"AQP2\", \"PIP\", \"CAV1\", \"SRC\", \"TRIM21\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}