{"gene":"AVP","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1984,"finding":"AVP stimulates pituitary ACTH release through a receptor that is pharmacologically distinct from classical V1 (pressor) and V2 (antidiuretic) receptors. V1-antagonists only partially inhibited AVP-induced ACTH secretion, the V2 agonist dDAVP was 20–30-fold less potent than AVP, and oxytocin was only 4–8-fold less potent, together indicating AVP acts on corticotrope cells via a novel receptor subtype (later identified as V1b/V3).","method":"In vitro pharmacological antagonism assay using rat anterior pituitary gland segments with selective V1/V2 antagonists and agonists, measuring ACTH secretion by RIA","journal":"Peptides","confidence":"High","confidence_rationale":"Tier 1–2 — rigorous in vitro pharmacological characterization with multiple selective ligands; foundational paper replicated and extended by subsequent work defining V1b receptor","pmids":["6089144"],"is_preprint":false},{"year":1988,"finding":"AVP induces rapid, concentration-dependent increases in intracellular Ca2+ ([Ca2+]i) and Ca2+ efflux in glomerular mesangial cells and causes cell contraction exclusively through V1 (pressor) receptors. This effect occurs partly via Ca2+ release from intracellular stores (even in Ca2+-free medium) and partly via Ca2+ influx; dantrolene (blocker of ER Ca2+ release) inhibited both Ca2+ efflux and contraction, whereas verapamil (Ca2+ channel blocker) only partially inhibited Ca2+ influx.","method":"Direct measurement of [Ca2+]i in adherent cultured mesangial cells, 45Ca2+ efflux assay, V1-selective antagonist d(CH2)5Tyr(Me)AVP, dantrolene and verapamil pharmacology, cell contraction assay","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Ca2+ imaging, isotope flux, pharmacological dissection) in a single rigorous study","pmids":["3394807"],"is_preprint":false},{"year":1992,"finding":"AVP and mineralocorticoids both stimulate Na+ transport in the cortical collecting duct by increasing the number and kinetic properties (open probability) of amiloride-sensitive Na+ channels in the apical membrane, but through distinct molecular mechanisms that allow synergism: AVP acts via cAMP/PKA to recruit quiescent channels and increase their open probability, while mineralocorticoids act via genomic pathways to synthesize new channels.","method":"Electrophysiological patch-clamp recording of apical Na+ channels combined with biochemical second-messenger studies in isolated perfused rat cortical collecting duct","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 1–2 — combines electrophysiology and biochemistry; represents synthesis of multiple studies; extensively replicated field","pmids":["1313121"],"is_preprint":false},{"year":1992,"finding":"Hippocampal efferents travelling in the lateral fimbria-fornix tonically inhibit AVP mRNA expression in the medial parvocellular paraventricular nucleus (PVN). Lateral fimbria-fornix lesions, but not medial lesions or corticohypothalamic tract sections, increased both CRH mRNA and AVP mRNA in the PVN and elevated ACTH secretion, placing the hippocampal–lateral fornix–PVN AVP circuit as an inhibitory node in HPA axis regulation.","method":"Selective forebrain fiber tract lesions combined with semi-quantitative in situ hybridization histochemistry for CRH and AVP mRNA, and plasma ACTH RIA in rats","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 — lesion-based epistasis with defined molecular readout (mRNA by ISH) and hormonal output; single study","pmids":["1333341"],"is_preprint":false},{"year":1993,"finding":"AVP-stimulated water permeability (Pf) in the inner medullary collecting duct is inhibited by extracellular nucleotides (ATP, UTP but not ADP) acting via P2u nucleotide receptors. This inhibition is upstream of cAMP: ATP decreased AVP-stimulated cAMP levels by ~32%, did not affect the Pf response to membrane-permeant cAMP analogues, and was abolished by the PKC inhibitor calphostin C, indicating the nucleotide receptor activates the phosphoinositide/PKC pathway to suppress adenylate cyclase coupling to the V2 receptor.","method":"In vitro perfusion of terminal IMCD tubules, osmotic water permeability measurements, cAMP assay in IMCD suspensions, PKC inhibitor calphostin C, cAMP analogue and forskolin controls","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 1–2 — reconstituted tubule perfusion with mechanistic dissection via multiple pharmacological probes and cAMP measurement; strong internal controls","pmids":["8594881"],"is_preprint":false},{"year":1993,"finding":"Epinephrine inhibits AVP-stimulated Na+ transport and osmotic water permeability in the cortical collecting duct via α2-adrenergic receptors. At low doses (100 nM) yohimbine (α2-antagonist) reversed the effect; epinephrine increased luminal membrane fractional resistance equivalently to amiloride, indicating blockade of apical amiloride-sensitive Na+ conductance. Residual (~40%) inhibition of cAMP-stimulated transport by epinephrine at high concentrations pointed to at least one additional intracellular messenger beyond adenylate cyclase inhibition.","method":"In vitro perfused cortical collecting ducts from Dahl-Rapp SS, SR and Sprague-Dawley rats; transepithelial voltage, Na+ flux, and water permeability measurements; 8-BrcAMP substitution; yohimbine pharmacology; amiloride comparison","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 — isolated tubule electrophysiology with pharmacological dissection; single study","pmids":["8105698"],"is_preprint":false},{"year":1993,"finding":"Emotional stress rapidly increases AVP gene transcription (assessed by intronic heteronuclear RNA) in the paraventricular nucleus within 2 hours, preceding changes in cytoplasmic mRNA. This finding positioned transcriptional upregulation of the AVP gene as an acute molecular response mediating activation of the HPA axis during psychological stress.","method":"In situ hybridization with an intronic riboprobe (complementary to an AVP intron sequence) to detect AVP hnRNA as a surrogate for nascent gene transcription in rat PVN following novel environment stress","journal":"Acta endocrinologica","confidence":"Medium","confidence_rationale":"Tier 2 — direct measurement of transcription rate via intronic probe in defined brain nuclei; single study but methodologically sound","pmids":["8317194"],"is_preprint":false},{"year":1995,"finding":"AVP stimulates PGE2 synthesis in isolated rabbit cortical collecting tubules through a V1-type receptor pathway rather than V2/cAMP. dDAVP (a selective V2 agonist) elicited only a very weak response at high doses, whereas AVP produced an immediate, transient, dose-dependent stimulation (~150–200% above baseline) of PGE2 synthesis requiring exogenous arachidonic acid, indicating the PGE2 response is coupled to V1 receptor-linked phospholipase activation.","method":"Superfusion of microdissected rabbit cortical collecting tubules, enzyme immunoassay for PGE2, comparison of AVP vs. dDAVP dose-response","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct tubule functional assay with pharmacological receptor subtype dissection; single lab","pmids":["2500029"],"is_preprint":false},{"year":1995,"finding":"Expression cloning from rabbit renal medulla identified a novel AVP-activated, calcium-mobilizing receptor protein (VACM-1, 780 amino acids) that is distinct from V1 and V2 AVP receptors. When expressed in Xenopus oocytes or COS-1 cells, VACM-1 conferred high-affinity AVP binding (Kd ~2 nM) and AVP-induced intracellular Ca2+ mobilization; immunohistochemistry localized VACM-1 to collecting tubule epithelia.","method":"Expression cloning in Xenopus oocyte system, COS-1 cell transfection, 125I-AVP binding assay, Ca2+ mobilization assay, in vitro translation with immunoprecipitation, immunohistochemistry","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 1 — expression cloning with functional reconstitution in two heterologous systems and direct binding characterization; multiple orthogonal methods in one study","pmids":["7611460"],"is_preprint":false},{"year":1995,"finding":"Both AVP and oxytocin stimulate insulin release from the perfused rat pancreas and from RINm5F cells exclusively through V1b (V3) receptors, not V1a or oxytocin receptors. The selective V1b antagonist dP[Tyr(Me)2]AVP abolished insulin release by both peptides, the V1a antagonist was inactive, and the V1b agonist d[D-3-Pal]VP dose-dependently stimulated insulin release, defining V1b as the functional receptor on pancreatic β-cells.","method":"Perfused rat pancreas preparation, RINm5F cell insulin release assay, systematic pharmacological profiling with selective V1b, V1a, and oxytocin receptor antagonists and agonists; RIA for insulin","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — rigorous pharmacological receptor identification in two systems with multiple selective ligands; strong internal controls","pmids":["8572202"],"is_preprint":false},{"year":1996,"finding":"PGE2 reverses AVP-mediated inhibition of HCO3- absorption in the medullary thick ascending limb by activating protein kinase C (PKC), which in turn inhibits AVP-stimulated cAMP production via a Gi-dependent mechanism. PKC inhibitors (staurosporine, chelerythrine) blocked the PGE2 reversal, the PKC activator PMA mimicked PGE2, and pertussis toxin abolished the PMA effect, demonstrating PKC→Gi→↓cAMP as the signaling cascade.","method":"In vitro perfusion of rat MTAL segments, measurement of HCO3- absorption, PKC inhibitors staurosporine and chelerythrine, phorbol ester PMA, pertussis toxin pretreatment, comparison with forskolin","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — intact tubule functional assay with convergent pharmacological evidence from inhibitors, activators, and toxin; multiple orthogonal interventions","pmids":["8764317"],"is_preprint":false},{"year":1997,"finding":"Both intact neurophysin (NP) coding region and the vasopressin (VP) coding region are required for proper AVP precursor processing and secretion. In COS cells transfected with Brattleboro (BB) rat AVP gene (which has a single guanine deletion in NP causing frameshift and loss of stop codon), no AVP was secreted; restoring a stop codon at the equivalent of the normal VP+NP length partially rescued secretion, whereas VP coding region alone was insufficient. This demonstrated that the BB frameshift in NP—not simply loss of glycopeptide coding region—is the molecular basis of diabetes insipidus in these rats.","method":"COS cell transfection with wild-type and mutated BB AVP gene constructs (systematic stop-codon insertion mutagenesis), AVP secretion measured by RIA, co-transfected β-galactosidase as internal control","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis with functional secretion readout; multiple constructs tested with internal controls","pmids":["9402088"],"is_preprint":false},{"year":1997,"finding":"AVP produced in suprachiasmatic nucleus (SCN) neurons tonically inhibits the CRH-adrenocorticotrope axis. Functional lesioning of SCN AVP neurons with AVP antibody–toxin conjugate decreased SCN AVP immunoreactive content and mRNA, increased CRH mRNA and decreased median eminence CRH immunoreactivity, and doubled plasma ACTH, positioning SCN-derived AVP as a direct upstream inhibitor of PVN CRH neurons.","method":"Targeted cytotoxic monoclonal antibody (anti-AVP) microinjection into rat SCN, AVP immunohistochemistry and RIA, AVP mRNA in situ hybridization, CRH mRNA ISH, CRH immunohistochemistry, plasma ACTH RIA","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — targeted functional lesion with multiple molecular readouts; single lab","pmids":["9404718"],"is_preprint":false},{"year":1997,"finding":"A dual angiotensin II/AVP receptor in the renal outer medullary thick ascending limb and inner medullary collecting duct responds equally to both Ang II and AVP; pharmacologically it behaves as a V2-type AVP receptor (displaced by DVDAVP) and a novel AT1-type angiotensin receptor coupled to adenylate cyclase (displaced by losartan but not PD 123319), distinct from prototype Ca2+-mobilizing AT1 receptors.","method":"Radioligand displacement binding assays with [3H]AVP and 125I-Ang II, selective V2 analogue DVDAVP, AT1 antagonist losartan, AT2 antagonist PD 123319, immunocytochemistry of renal sections","journal":"Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 — radioligand binding with pharmacological profiling and tissue localization; single study","pmids":["9095083"],"is_preprint":false},{"year":2001,"finding":"Norepinephrine microinjected into the rat PVN differentially regulates CRH and AVP gene transcription: it strongly increases CRH hnRNA but does not affect AVP hnRNA in adrenal-intact animals. Removing the corticosterone feedback (adrenalectomy with basal corticosterone replacement) unmasked a significant NE-induced increase in AVP hnRNA, demonstrating that corticosterone exerts greater suppressive control over AVP gene transcription than over CRH, thereby explaining differential secretagogue regulation of the HPA axis.","method":"Intra-PVN norepinephrine microinjection in conscious rats, semi-quantitative in situ hybridization with intron-specific riboprobes for CRH and AVP hnRNA, adrenalectomy with subcutaneous corticosterone pellet model","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vivo intervention with molecular transcription readout using intronic probes; single lab but well-controlled","pmids":["11295232"],"is_preprint":false},{"year":2004,"finding":"AVP stimulates distal tubular K+ secretion via luminal V1 receptors through a PLC/Ca2+/PKC signaling pathway, not through adenylate cyclase/cAMP/PKA. In vivo microperfusion showed that PKC inhibitor staurosporine (45% inhibition) and the Ca2+ chelator BAPTA (41% inhibition) blocked AVP-stimulated K+ flux, while the PKA inhibitor H89 had no effect; AVP-stimulated K+ secretion was further reduced by BK (maxi-K) channel blockers TEA and iberiotoxin, identifying the downstream effector channel.","method":"In vivo stationary microperfusion of rat cortical distal tubules, double-barreled K+-selective microelectrodes, selective inhibitors for PKA (H89), PKC (staurosporine), Ca2+ chelation (BAPTA), and BK channel blockers (TEA, iberiotoxin)","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 1–2 — in vivo tubule electrophysiology with comprehensive signaling pathway dissection using multiple pharmacological probes; clearly identifies pathway and effector channel","pmids":["15253724"],"is_preprint":false},{"year":2005,"finding":"Repeated agonistic encounters (dominant experience) selectively increase AVP V1a receptor binding in the lateral ventromedial hypothalamus (VMHL) of dominant hamsters compared to subordinates, independent of testosterone levels. Acute social defeat alone does not alter V1a receptor binding, indicating that experience-dependent plasticity in V1a receptor density in a specific hypothalamic nucleus correlates with and may mediate the behavioral changes associated with repeated social victory.","method":"Radioligand receptor autoradiography with [125I]linear AVP across multiple brain regions, plasma testosterone RIA, controlled dominant/subordinate agonistic encounter paradigm in Syrian hamsters","journal":"Hormones and behavior","confidence":"Medium","confidence_rationale":"Tier 2 — direct receptor binding measurement with regional specificity and behavioral correlate; single lab","pmids":["15935353"],"is_preprint":false},{"year":2007,"finding":"The calcium-sensing receptor (CaSR) attenuates AVP-induced aquaporin-2 (AQP2) expression in cortical collecting duct principal cells via a calmodulin-dependent mechanism. High extracellular Ca2+ or CaSR agonists (neomycin, Gd3+) reduced AVP-induced cAMP accumulation and AQP2 mRNA/protein; this was not due to phosphodiesterase activation or direct adenylate cyclase inhibition, but was prevented by calmodulin inhibition; CaSR gene silencing abolished the effect.","method":"Mouse cortical collecting duct cell line (mpkCCDcl4), CaSR agonist pharmacology, CaSR gene silencing (siRNA), cAMP measurement, AQP2 mRNA and protein quantification, phosphodiesterase and adenylate cyclase pharmacological dissection, calmodulin inhibitor","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (siRNA, pharmacology, mRNA, protein, cAMP) in a single study; loss-of-function confirms mechanism","pmids":["18032798"],"is_preprint":false},{"year":2014,"finding":"Polycomb group (PcG) complex binding at the Avp downstream enhancer precedes and primes the emergence of early-life stress (ELS)-responsive DNA methylation at that locus. In an embryonic stem cell-derived hypothalamic-like differentiation model, PcG occupancy correlated with gene silencing and co-occurred with Tet protein binding (preventing premature DNA methylation); differentiation evicted PcG complexes, leading to DNMT recruitment and enhancer methylation, then increased MeCP2 binding—establishing the epigenetic sequence controlling Avp enhancer programming.","method":"ESC-derived hypothalamic-like differentiation model, chromatin immunoprecipitation (ChIP) for PcG proteins (EZH2, SUZ12), Tet1/Tet2, MeCP2, DNMT3a/b; bisulfite sequencing for DNA methylation; in vivo mouse experiments; Avp mRNA quantification","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP combined with in vitro differentiation model and in vivo validation; single lab but multiple molecular endpoints","pmids":["24599304"],"is_preprint":false},{"year":2021,"finding":"Activating the apelin receptor (apelin-R) with a metabolically stable apelin-17 analog (LIT01-196) opposes AVP-mediated antidiuresis by decreasing dDAVP-induced cAMP production and reducing apical cell-surface expression of phosphorylated aquaporin-2 in collecting duct cells via V2 receptor modulation, thereby increasing aqueous diuresis and correcting experimental hyponatremia.","method":"In vivo rat pharmacokinetics (subcutaneous administration), collecting duct cell cAMP assay, AQP2 phosphorylation and membrane trafficking by immunofluorescence, rat model of AVP-induced hyponatremia with urinary osmolality and serum sodium measurements","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — functional in vitro and in vivo studies with molecular endpoint (AQP2 trafficking, cAMP); single lab","pmids":["33436646"],"is_preprint":false},{"year":2021,"finding":"Oestrogen inhibits salt-dependent hypertension by suppressing GABAergic excitation in hypothalamic magnocellular AVP neurons. DOCA-salt treatment converted GABAergic inhibition to excitation in AVP neurons (due to increased NKCC1/decreased KCC2 expression shifting the chloride equilibrium potential), raised plasma AVP and blood pressure; oestrogen reversed all these effects by modulating NKCC1 and KCC2 activity/expression, and the KCC2 activator CLP290 phenocopied oestrogen.","method":"Rat DOCA-salt uninephrectomy hypertension model, whole-cell patch-clamp electrophysiology of AVP neurons in hypothalamic slices, GABA equilibrium potential measurement, plasma AVP RIA, blood pressure measurement, Western blotting for NKCC1/KCC2, in vivo CLP290 treatment","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 1–2 — electrophysiology in identified AVP neurons combined with molecular mechanism (NKCC1/KCC2) and in vivo pharmacological rescue; multiple orthogonal methods","pmids":["32960965"],"is_preprint":false},{"year":2022,"finding":"Depression-associated elevations in AVP reduce AHI1 expression in macrophages, thereby impairing type-I interferon (IFN-I) antiviral signaling. Mechanistically, AHI1 recruits the deubiquitinase OTUD1 to stabilize Tyk2; AVP-driven AHI1 reduction leads to Tyk2 destabilization and attenuated IFN-I signaling. This identifies an AVP→AHI1→OTUD1→Tyk2→IFN-I axis connecting depression-related neuropeptide signaling to innate antiviral immunity.","method":"PBMCs and macrophages from MDD patients, depression model mice (CUMS), AHI1 knockdown/overexpression, Co-IP to demonstrate AHI1–OTUD1–Tyk2 interaction, ubiquitination assays, IFN-I signaling readouts (STAT1 phosphorylation), AVP treatment of macrophages, meptazinol pharmacology","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic signaling pathway defined by Co-IP, ubiquitination assay, KD/KO with defined molecular phenotype, validated in human patient samples and mouse model","pmids":["35821088"],"is_preprint":false}],"current_model":"AVP (arginine vasopressin) is a nonapeptide whose precursor requires both the vasopressin and intact neurophysin coding regions for proper processing and secretion; it signals through at least three receptor subtypes (V1a, V1b/V3, and V2) coupled to distinct intracellular pathways — V1a/V1b via PLC/Ca2+/PKC (mediating mesangial contraction, K+ secretion, corticotrope ACTH release, and PGE2 synthesis), V2 via adenylate cyclase/cAMP/PKA (mediating water reabsorption through AQP2 trafficking and Na+ channel regulation in collecting duct) — with additional modulation by nucleotide receptors (P2u/PKC), PGE2 (PKC→Gi→↓cAMP), calmodulin-dependent CaSR signaling, and GABAergic chloride homeostasis (NKCC1/KCC2) in magnocellular AVP neurons; at the gene level, AVP transcription is tonically inhibited by hippocampal efferents and corticosterone, acutely upregulated by stress and norepinephrine, and epigenetically programmed via a polycomb-primed, ELS-responsive methylation mechanism at a downstream enhancer, while peripherally AVP reduces AHI1 in macrophages to destabilize Tyk2 and attenuate IFN-I antiviral signaling."},"narrative":{"teleology":[{"year":1984,"claim":"Identifying the receptor subtype mediating AVP-stimulated ACTH release resolved why V1 and V2 antagonists failed to fully block pituitary corticotrope activation, establishing the existence of a pharmacologically distinct third AVP receptor (later called V1b/V3).","evidence":"In vitro pharmacological antagonism assay on rat anterior pituitary segments with selective V1/V2 ligands, measuring ACTH by RIA","pmids":["6089144"],"confidence":"High","gaps":["V1b receptor gene had not yet been cloned","downstream signaling cascade of V1b in corticotropes was not defined"]},{"year":1988,"claim":"Demonstrating that AVP causes mesangial cell contraction through V1-mediated intracellular Ca²⁺ mobilization from ER stores and extracellular Ca²⁺ influx established the dual-source Ca²⁺ mechanism underlying AVP's glomerular hemodynamic effects.","evidence":"Ca²⁺ imaging, ⁴⁵Ca²⁺ efflux, V1-selective antagonist, dantrolene and verapamil pharmacology in cultured mesangial cells","pmids":["3394807"],"confidence":"High","gaps":["identity of the voltage-insensitive Ca²⁺ influx channel was unknown","relevance to intact glomerular filtration rate regulation not directly tested"]},{"year":1992,"claim":"Patch-clamp studies revealed that AVP acts via cAMP/PKA to recruit quiescent apical Na⁺ channels and increase their open probability in the collecting duct, distinguishing this mechanism from mineralocorticoid-driven de novo channel synthesis and explaining their synergism in sodium reabsorption.","evidence":"Electrophysiological patch-clamp and cAMP measurements in isolated perfused rat cortical collecting duct","pmids":["1313121"],"confidence":"High","gaps":["molecular identity of the Na⁺ channel pool recruited by AVP was unclear","trafficking mechanism for channel insertion was not defined"]},{"year":1992,"claim":"Selective lesion of the lateral fimbria-fornix revealed that hippocampal efferents tonically suppress AVP mRNA in the parvocellular PVN, establishing a neural circuit-level inhibitory input to AVP gene expression within the HPA axis.","evidence":"Selective forebrain fiber tract lesions with in situ hybridization for AVP and CRH mRNA, plasma ACTH RIA in rats","pmids":["1333341"],"confidence":"Medium","gaps":["neurotransmitter identity of the inhibitory hippocampal projection was unknown","single lesion study without chemogenetic or optogenetic confirmation"]},{"year":1993,"claim":"Intronic hnRNA measurements showed that emotional stress rapidly induces AVP gene transcription within 2 hours in the PVN, positioning transcriptional activation as the acute molecular response coupling psychological stress to HPA axis output.","evidence":"In situ hybridization with intron-specific riboprobe for AVP hnRNA in rat PVN after novel environment stress","pmids":["8317194"],"confidence":"Medium","gaps":["upstream transcription factors driving stress-induced AVP transcription were not identified","single stressor paradigm"]},{"year":1993,"claim":"Nucleotide receptors (P2u) were found to oppose AVP-stimulated water permeability by activating PKC to suppress V2-coupled adenylate cyclase, revealing a paracrine brake on AVP antidiuresis in the inner medullary collecting duct.","evidence":"In vitro perfusion of terminal IMCD tubules with cAMP assay, PKC inhibitor calphostin C, cAMP analogue controls","pmids":["8594881"],"confidence":"High","gaps":["physiological source and regulation of luminal ATP/UTP was not defined","whether P2u modulation operates in vivo was untested"]},{"year":1995,"claim":"Systematic pharmacological profiling identified V1b as the sole AVP receptor subtype mediating insulin secretion from pancreatic β-cells, extending V1b function beyond corticotropes to endocrine pancreas.","evidence":"Perfused rat pancreas and RINm5F cells with selective V1b, V1a, and OT receptor antagonists/agonists; insulin RIA","pmids":["8572202"],"confidence":"High","gaps":["downstream intracellular signaling cascade from V1b to insulin granule exocytosis was not mapped","physiological contribution of AVP to glucose homeostasis in vivo was not quantified"]},{"year":1996,"claim":"PGE₂ was shown to reverse AVP-mediated inhibition of bicarbonate absorption in the MTAL through a PKC→Gᵢ→↓cAMP cascade, defining a complete counter-regulatory signaling pathway downstream of prostaglandin receptors that modulates AVP actions in the thick ascending limb.","evidence":"In vitro perfused MTAL segments with PKC inhibitors, PMA, pertussis toxin, and forskolin controls","pmids":["8764317"],"confidence":"High","gaps":["specific EP receptor subtype responsible was not identified","whether this pathway operates during in vivo prostaglandin elevations (e.g. NSAID withdrawal) was untested"]},{"year":1997,"claim":"Mutagenesis of the Brattleboro AVP gene demonstrated that the neurophysin coding region is essential for precursor processing and secretion, establishing the molecular basis of autosomal recessive diabetes insipidus as a frameshift-induced protein-folding defect rather than simple loss of the glycopeptide.","evidence":"COS cell transfection with systematic stop-codon insertion constructs, AVP secretion by RIA","pmids":["9402088"],"confidence":"High","gaps":["precise folding intermediate trapped by the frameshift-extended neurophysin was not structurally resolved","ER stress consequences of misfolded precursor were not examined"]},{"year":2001,"claim":"Demonstrating that corticosterone selectively gates norepinephrine-induced AVP (but not CRH) transcription in the PVN explained the differential regulation of the two HPA secretagogues and positioned glucocorticoid feedback as a preferential brake on AVP gene expression.","evidence":"Intra-PVN norepinephrine microinjection with intronic hnRNA ISH in adrenal-intact vs. adrenalectomized rats with corticosterone replacement","pmids":["11295232"],"confidence":"Medium","gaps":["glucocorticoid response element mediating this selective suppression was not mapped","single neurotransmitter tested"]},{"year":2004,"claim":"In vivo tubule microperfusion identified that AVP stimulates distal K⁺ secretion through luminal V1 receptors via PLC/Ca²⁺/PKC activating BK (maxi-K) channels, rather than the canonical V2/cAMP/PKA pathway, establishing a novel effector pathway for AVP in potassium handling.","evidence":"In vivo stationary microperfusion of rat cortical distal tubules with K⁺-selective microelectrodes, H89, staurosporine, BAPTA, TEA, and iberiotoxin","pmids":["15253724"],"confidence":"High","gaps":["molecular identity of the luminal V1 receptor subtype (V1a vs V1b) was not resolved","contribution to whole-body potassium balance was not quantified"]},{"year":2007,"claim":"CaSR activation attenuates AVP-induced AQP2 expression via calmodulin-dependent inhibition of cAMP accumulation, providing a molecular mechanism for hypercalcemia-associated nephrogenic diabetes insipidus.","evidence":"mpkCCDcl4 cells with CaSR agonists, CaSR siRNA, calmodulin inhibitor, cAMP and AQP2 protein/mRNA measurements","pmids":["18032798"],"confidence":"High","gaps":["specific calmodulin target (e.g. AC isoform or PDE isoform) was not identified","in vivo confirmation in CaSR-deficient animals was not performed"]},{"year":2014,"claim":"Polycomb complex occupancy at the Avp downstream enhancer was shown to precede and prime early-life stress-responsive DNA methylation changes, establishing the epigenetic sequence (PcG → Tet binding → DNMT recruitment → MeCP2) that programs AVP gene regulation during development.","evidence":"ESC-derived hypothalamic-like differentiation model with ChIP for PcG/Tet/MeCP2/DNMT, bisulfite sequencing, and in vivo validation","pmids":["24599304"],"confidence":"Medium","gaps":["whether this epigenetic sequence is causal for long-term AVP expression changes in vivo after ELS was not conclusively demonstrated","cell model may not fully recapitulate PVN neuron identity"]},{"year":2021,"claim":"Oestrogen was shown to suppress salt-dependent hypertension by reversing GABA excitation in magnocellular AVP neurons: DOCA-salt increased NKCC1 and decreased KCC2, shifting the Cl⁻ equilibrium to make GABA depolarizing; oestrogen restored normal Cl⁻ transporter expression and reduced plasma AVP and blood pressure.","evidence":"Whole-cell patch-clamp in identified AVP neurons in hypothalamic slices, NKCC1/KCC2 Western blot, plasma AVP RIA, blood pressure measurement, CLP290 rescue in DOCA-salt rats","pmids":["32960965"],"confidence":"High","gaps":["oestrogen receptor subtype (ERα vs ERβ) and genomic vs non-genomic action on NKCC1/KCC2 were not dissected","whether this mechanism operates in human salt-sensitive hypertension is unknown"]},{"year":2021,"claim":"Activation of the apelin receptor was shown to oppose AVP antidiuresis by reducing V2-stimulated cAMP and AQP2 membrane insertion, demonstrating a druggable counter-regulatory axis relevant to hyponatremia correction.","evidence":"Collecting duct cell cAMP assay, AQP2 phosphorylation/trafficking by immunofluorescence, in vivo rat model of AVP-induced hyponatremia","pmids":["33436646"],"confidence":"Medium","gaps":["molecular mechanism by which apelin receptor suppresses V2-coupled adenylate cyclase was not defined","single lab, not yet replicated in clinical hyponatremia"]},{"year":2022,"claim":"AVP was found to suppress macrophage antiviral IFN-I signaling by reducing AHI1, which normally recruits OTUD1 to deubiquitinate and stabilize Tyk2, thereby linking depression-associated AVP elevation to impaired innate immunity.","evidence":"Co-IP for AHI1–OTUD1–Tyk2, ubiquitination assays, AHI1 KD/overexpression, AVP treatment of macrophages, validated in MDD patient PBMCs and CUMS mouse model","pmids":["35821088"],"confidence":"High","gaps":["AVP receptor subtype on macrophages mediating AHI1 downregulation was not identified","whether this pathway contributes to infection susceptibility in depression patients in vivo is unestablished"]},{"year":null,"claim":"Key unresolved questions include the structural basis of AVP precursor folding and its interaction with neurophysin during ER processing, the complete signaling architecture downstream of V1b in β-cells and corticotropes, and whether the AVP–AHI1–Tyk2 immunosuppressive axis is targetable for infection prevention in depression.","evidence":"","pmids":[],"confidence":"Low","gaps":["no high-resolution structure of the AVP-neurophysin precursor in the ER folding intermediate state","V1b downstream signaling to insulin exocytosis machinery not mapped","in vivo relevance of AVP-AHI1-Tyk2 axis to clinical infection susceptibility untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,2,9,15,21]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[12,21]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,2,9,11,15,21]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,9,15,17,21]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[2,4,15,17,19]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21]}],"complexes":[],"partners":["AVPR1A","AVPR1B","AVPR2","AQP2","AHI1","TYK2"],"other_free_text":[]},"mechanistic_narrative":"AVP encodes the vasopressin-neurophysin 2-copeptin precursor, a nonapeptide hormone that signals through V1a (PLC/Ca²⁺/PKC), V1b (PLC/Ca²⁺/PKC), and V2 (adenylate cyclase/cAMP/PKA) receptor subtypes to regulate water and electrolyte homeostasis, HPA axis output, and innate immunity. In the kidney, V2 receptor activation drives AQP2 trafficking and apical Na⁺ channel opening for water and sodium reabsorption, while V1 receptor signaling mediates mesangial cell contraction, PGE₂ synthesis, and K⁺ secretion through BK channels; these pathways are counter-regulated by nucleotide/P2u-PKC, PGE₂-PKC→Gᵢ, CaSR-calmodulin, and apelin receptor systems [PMID:3394807, PMID:1313121, PMID:8594881, PMID:8764317, PMID:15253724, PMID:18032798, PMID:33436646]. Proper precursor processing and secretion require both the vasopressin and neurophysin coding regions, and frameshift loss of neurophysin causes diabetes insipidus [PMID:9402088]. Peripherally, AVP suppresses macrophage AHI1 expression, destabilizing Tyk2 via loss of OTUD1-mediated deubiquitination and attenuating type-I interferon antiviral signaling [PMID:35821088]."},"prefetch_data":{"uniprot":{"accession":"P01185","full_name":"Vasopressin-neurophysin 2-copeptin","aliases":["AVP-NPII"],"length_aa":164,"mass_kda":17.3,"function":"Has a direct antidiuretic action on the kidney, it also causes vasoconstriction of the peripheral vessels. Acts by binding to vasopressin receptors (V1bR/AVPR1B, V1aR/AVPR1A, and V2R/AVPR2) Specifically binds vasopressin","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P01185/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AVP","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AVP","total_profiled":1310},"omim":[{"mim_id":"618537","title":"ARGININE VASOPRESSIN-INDUCED PROTEIN 1; AVPI1","url":"https://www.omim.org/entry/618537"},{"mim_id":"614776","title":"SIK FAMILY KINASE 3; SIK3","url":"https://www.omim.org/entry/614776"},{"mim_id":"606416","title":"NLR FAMILY, PYRIN DOMAIN-CONTAINING 3; NLRP3","url":"https://www.omim.org/entry/606416"},{"mim_id":"605314","title":"HISTONE DEACETYLASE 4; HDAC4","url":"https://www.omim.org/entry/605314"},{"mim_id":"602186","title":"VGF, NERVE GROWTH FACTOR-INDUCIBLE; VGF","url":"https://www.omim.org/entry/602186"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":4348.0}],"url":"https://www.proteinatlas.org/search/AVP"},"hgnc":{"alias_symbol":["ADH"],"prev_symbol":["ARVP"]},"alphafold":{"accession":"P01185","domains":[{"cath_id":"2.60.9.10","chopping":"36-131","consensus_level":"medium","plddt":87.6228,"start":36,"end":131}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P01185","model_url":"https://alphafold.ebi.ac.uk/files/AF-P01185-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P01185-F1-predicted_aligned_error_v6.png","plddt_mean":79.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AVP","jax_strain_url":"https://www.jax.org/strain/search?query=AVP"},"sequence":{"accession":"P01185","fasta_url":"https://rest.uniprot.org/uniprotkb/P01185.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P01185/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P01185"}},"corpus_meta":[{"pmid":"10377428","id":"PMC_10377428","title":"Colinearity 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\"is_preprint\": false\n    },\n    {\n      \"year\": 1984,\n      \"finding\": \"AVP stimulates pituitary ACTH secretion via a novel receptor on corticotrope cells that is pharmacologically distinct from classical V1 (pressor) and V2 (antidiuretic) receptors, later designated V1b/V3.\",\n      \"method\": \"In vitro anterior pituitary segment assay with selective V1 antagonists and AVP analogues (dDAVP, oxytocin)\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro functional assay with multiple agonists/antagonists defining a novel receptor pharmacology, foundational paper with 90 citations\",\n      \"pmids\": [\"6089144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Extracellular nucleotide receptor (P2u) activation by ATP or UTP inhibits AVP-stimulated osmotic water permeability in terminal inner medullary collecting duct (IMCD) by decreasing cellular cAMP levels via activation of the phosphoinositide/protein kinase C signaling pathway.\",\n      \"method\": \"In vitro perfused rat IMCD, osmotic water permeability measurements, cAMP assays, calphostin C (PKC inhibitor) treatment\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted tubule system, pharmacological dissection with PKC inhibitor and cAMP analogue, multiple orthogonal methods\",\n      \"pmids\": [\"8594881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Expression cloning identified VACM-1, a novel AVP receptor (780 amino acids) in rabbit renal medulla linked to Ca2+ mobilization, distinct from V1 and V2 receptors, with immunohistochemical localization to collecting tubule epithelia.\",\n      \"method\": \"Expression cloning in Xenopus oocytes, COS-1 cell transfection, 125I-AVP binding assay, Ca2+ mobilization assay, immunoprecipitation, immunohistochemistry\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — expression cloning with functional reconstitution, binding assay, and immunohistochemistry in a single study\",\n      \"pmids\": [\"7611460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"AVP and oxytocin stimulate insulin release from pancreatic beta-cells via V1b receptors, not V1a or oxytocin receptors, as demonstrated by selective receptor antagonists.\",\n      \"method\": \"Perfused rat pancreas assay, RINm5F cell line, selective receptor antagonists including V1b-specific dP[Tyr(Me)2]AVP and V1b agonist d[D-3-Pal]VP\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — pharmacological dissection with multiple selective agonists/antagonists in two model systems\",\n      \"pmids\": [\"8572202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"AVP induces rapid concentration-dependent increases in intracellular Ca2+ and Ca2+ efflux in glomerular mesangial cells and causes contraction, mediated exclusively via V1 (pressor) receptors; the Ca2+ response involves both release from intracellular stores (dantrolene-sensitive) and extracellular Ca2+ influx partially through non-voltage-gated channels.\",\n      \"method\": \"Fura-2 fluorescence Ca2+ imaging, 45Ca2+ efflux measurements, V1 antagonist d(CH2)5Tyr(Me)AVP, dantrolene and verapamil treatment, Ca2+-free medium experiments\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct intracellular Ca2+ measurement with pharmacological dissection, multiple orthogonal methods\",\n      \"pmids\": [\"3394807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"PGE2 reverses AVP inhibition of HCO3- absorption in the medullary thick ascending limb (MTAL) by activating protein kinase C (PKC), which inhibits AVP-stimulated cAMP production via a Gi-dependent mechanism.\",\n      \"method\": \"In vitro perfused rat MTAL, HCO3- flux measurements, PKC inhibitors staurosporine and chelerythrine, phorbol ester (PMA), pertussis toxin\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted tubule system with pharmacological dissection using multiple kinase inhibitors and pertussis toxin\",\n      \"pmids\": [\"8764317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Luminal AVP stimulates distal tubule K+ secretion via V1 receptors through the PLC/Ca2+/PKC signaling pathway (not via adenylate cyclase/cAMP/PKA), acting on maxi-potassium (BK) channels.\",\n      \"method\": \"In vivo stationary microperfusion of rat cortical distal tubules, K+-selective microelectrodes, PKC inhibitor staurosporine, BAPTA (Ca2+ chelator), H89 (PKA inhibitor), iberiotoxin (BK channel blocker)\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo microperfusion with pharmacological dissection of signaling cascade, multiple inhibitors targeting distinct pathway components\",\n      \"pmids\": [\"15253724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaSR activation by high extracellular calcium attenuates AVP-induced aquaporin-2 (AQP2) expression in cortical collecting duct cells by reducing coupling efficiency between the V2 receptor and adenylate cyclase via a calmodulin-dependent mechanism.\",\n      \"method\": \"mpkCCDcl4 cell line, CaSR gene silencing (siRNA), cAMP assays, phosphodiesterase and adenylate cyclase inhibitors, calmodulin inhibitor, AQP2 mRNA and protein quantification\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gene silencing combined with pharmacological dissection and multiple outcome measures in a defined cell line\",\n      \"pmids\": [\"18032798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"AVP processing and secretion requires both the vasopressin (VP) and intact neurophysin (NP) coding regions of the precursor; the glycopeptide (GP) region is not required. The single-base deletion in the NP region of Brattleboro rats causes a frameshift producing mutated extended C-terminus and abnormal NP, leading to impaired AVP precursor folding, processing, transport, and secretion.\",\n      \"method\": \"COS cell transfection with wild-type and mutant AVP gene constructs (deletions, stop codon insertions), RIA for secreted AVP, beta-galactosidase normalization\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis of precursor coding regions with functional secretion readout in transfected cells\",\n      \"pmids\": [\"9402088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Hippocampal efferents traveling in the lateral fimbria-fornix tonically inhibit AVP mRNA expression and ACTH secretion in the hypothalamic paraventricular nucleus; selective lateral fimbria-fornix lesions increased both PVN AVP mRNA and ACTH secretion, placing hippocampus upstream of AVP neurons in HPA axis regulation.\",\n      \"method\": \"Selective forebrain fiber tract lesions in rats, semi-quantitative in situ hybridization for CRH and AVP mRNA, plasma ACTH measurements\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic/anatomical epistasis via lesion with quantitative mRNA and hormonal readouts\",\n      \"pmids\": [\"1333341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"AVP gene transcription in the paraventricular nucleus is rapidly increased by emotional stress, as measured by AVP heteronuclear RNA (hnRNA), indicating rapid transcriptional activation contributing to HPA axis activation.\",\n      \"method\": \"In situ hybridization with intronic probe for AVP hnRNA in rats exposed to emotional stress (novel environment), plasma ACTH measurement\",\n      \"journal\": \"Acta endocrinologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct measurement of nuclear (intronic) pre-mRNA reflecting active transcription, with functional HPA readout\",\n      \"pmids\": [\"8317194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AVP from the suprachiasmatic nucleus (SCN) inhibits the CRH-adrenocorticotrophic axis; functional lesioning of SCN AVP neurons with immunotoxin decreased pPVN AVP content and increased plasma ACTH and PVN CRH mRNA.\",\n      \"method\": \"Immunotoxin (cytotoxic MAb against AVP conjugated to toxin) microinjected into SCN, AVP immunoreactivity, AVP mRNA (in situ hybridization), ACTH RIA, CRH mRNA measurement\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — targeted neuronal ablation with multiple molecular and hormonal readouts establishing pathway position\",\n      \"pmids\": [\"9404718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Corticosterone differentially regulates CRH vs. AVP gene transcription in the paraventricular nucleus; norepinephrine microinjection into the PVN stimulates CRH hnRNA in both intact and adrenalectomized rats but increases AVP hnRNA only in adrenalectomized (low-corticosterone) rats, indicating corticosterone preferentially suppresses AVP gene transcription.\",\n      \"method\": \"PVN microinjection of norepinephrine in sham and adrenalectomized rats, in situ hybridization with intron-specific probes for CRH and AVP hnRNA\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological manipulation combined with direct transcriptional readout (hnRNA), controlled experimental design\",\n      \"pmids\": [\"11295232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Early-life stress causes sustained hypomethylation at the downstream Avp enhancer and overexpression of hypothalamic Avp. Polycomb complex (PcG) binding precedes the establishment of ELS-responsive DNA methylation; PcG eviction during hypothalamic differentiation triggers DNMT recruitment and enhancer methylation, while PcG occupancy correlates with Tet protein binding preventing methylation.\",\n      \"method\": \"Embryonic stem cell-derived hypothalamic differentiation model, ChIP for PcG/Tet proteins, bisulfite sequencing for DNA methylation, in vivo experiments in early-life stress mice\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP experiments with in vivo validation, orthogonal methods (ChIP + bisulfite sequencing + differentiation model)\",\n      \"pmids\": [\"24599304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Depression-elevated AVP reduces AHI1 expression in macrophages; AHI1 stabilizes Tyk2 by recruiting the deubiquitinase OTUD1 to prevent Tyk2 ubiquitin-mediated degradation, thereby maintaining type-I interferon (IFN-I) signaling. AVP-induced AHI1 reduction downregulates Tyk2 and attenuates antiviral innate immunity.\",\n      \"method\": \"PBMCs/macrophages from MDD patients, depression model mice, Co-IP for AHI1-OTUD1-Tyk2 complex, ubiquitination assays, AHI1 knockdown/overexpression, IFN-I signaling assays\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP identifying AVP→AHI1→OTUD1→Tyk2 pathway, validated in human patient samples and mouse model\",\n      \"pmids\": [\"35821088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The dual angiotensin II/AVP receptor in renal outer medullary thick ascending limb and inner medullary collecting duct has V2-type AVP receptor pharmacology (displaced by DVDAVP) and AT1-type angiotensin receptor pharmacology (displaced by losartan), and is coupled to adenylate cyclase rather than Ca2+ mobilization.\",\n      \"method\": \"Radioligand binding ([3H]AVP, 125I-Ang II) with selective displacing agents (DVDAVP, losartan, PD 123319), immunocytochemistry in rat kidney sections\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological binding characterization with multiple selective ligands plus anatomical localization\",\n      \"pmids\": [\"9095083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Epinephrine acting via alpha-2 receptors inhibits AVP-stimulated Na+ transport and osmotic water permeability in the cortical collecting duct by inhibiting adenylate cyclase, with at least one additional intracellular second messenger pathway also involved.\",\n      \"method\": \"In vitro perfused CCD from Dahl rat strains and Sprague-Dawley rats, amiloride luminal membrane resistance, cAMP analogue (8-BrcAMP), yohimbine (alpha-2 antagonist)\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct perfused tubule measurements with pharmacological dissection, replicated in multiple rat strains\",\n      \"pmids\": [\"8105698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"AVP stimulates PGE2 synthesis in cortical collecting tubules (CCD) via a V1-receptor pathway (not V2), as its analogue dDAVP (selective V2 agonist) produced only a weak response at high doses.\",\n      \"method\": \"In vitro superfused isolated rabbit CCD, PGE2 enzyme immunoassay, AVP vs. dDAVP comparison\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct tubule measurement with pharmacological comparison of V1 vs V2 agonists\",\n      \"pmids\": [\"2500029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"During AVP-stimulated water reabsorption, transcellular water flow does not cause significant cell volume changes; instead, fluid accumulates in lateral and basal intercellular spaces, maintaining nearly constant cell volume.\",\n      \"method\": \"Quantitative light microscopy of cell volume in collecting tubules of rabbit kidney cortex during antidiuresis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct quantitative imaging of cell volume during defined hormonal stimulation\",\n      \"pmids\": [\"3823867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Apelin receptor (apelin-R) activation decreases AVP type 2 receptor (V2R)-mediated cAMP production and apical cell surface expression of phosphorylated aquaporin-2 in collecting ducts, counteracting AVP-induced antidiuresis and hyponatremia.\",\n      \"method\": \"Collecting duct cell assays for cAMP, AQP2 phosphorylation and surface expression by Western blot; rat model of AVP-induced hyponatremia with subcutaneous LIT01-196 treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro mechanistic data (cAMP, AQP2 trafficking) combined with in vivo physiological validation\",\n      \"pmids\": [\"33436646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Oestrogen inhibits salt-dependent hypertension by suppressing GABAergic excitation in hypothalamic magnocellular AVP neurons via modulation of NKCC1 (Cl- importer) and KCC2 (Cl- extruder) activity/expression, preventing excessive AVP secretion.\",\n      \"method\": \"DOCA-salt rat hypertension model, electrophysiology of hypothalamic AVP neurons, NKCC1/KCC2 protein expression, V1a receptor antagonist depressor effect, CLP290 (KCC2 activator) treatment\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology of defined neurons plus molecular target (NKCC1/KCC2) and in vivo rescue experiments\",\n      \"pmids\": [\"32960965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1983,\n      \"finding\": \"Specific AVP binding sites are distributed in subcellular particulate fractions of rat brain (100K microsomal and 12K mitochondrial fractions), with regional variation; hippocampus and septum show predominant 12K pellet binding, differing from other brain regions where 100K predominates. Binding requires divalent metal ions and is rapidly reversible by EDTA.\",\n      \"method\": \"Subcellular fractionation of rat brain, 3H-AVP radioligand binding, Scatchard analysis, regional dissection\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — radioligand binding characterization, single lab, no functional consequence linked to localization\",\n      \"pmids\": [\"6415623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"A selective V2 AVP receptor antagonist radioligand ([3H]desGly-NH2(9)-d(CH2)5[D-Ileu2,Ileu4]AVP) binds renal kidney with high affinity (Kd 2.8 nM) to a single class of sites, with autoradiographic distribution concentrated in inner and outer medulla consistent with V2 receptor localization.\",\n      \"method\": \"Radioligand binding assay with Scatchard analysis, competition binding with AVP analogues, kidney autoradiography\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — radioligand characterization, single lab, primarily a pharmacological tool development paper\",\n      \"pmids\": [\"1815207\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AVP (arginine vasopressin) is a nonapeptide hormone synthesized as a precursor requiring both the vasopressin and intact neurophysin coding regions for proper processing and secretion; it acts through pharmacologically distinct receptor subtypes (V1a, V1b/V3, V2, and novel receptors) coupled to different intracellular cascades—V2 receptors activate adenylate cyclase/cAMP/PKA to increase AQP2-mediated water permeability and Na+ channel activity in renal collecting duct, while V1-class receptors activate PLC/Ca2+/PKC to mediate mesangial cell contraction, distal K+ secretion, and pituitary ACTH release (V1b); AVP gene transcription in the paraventricular nucleus is rapidly activated by stress and norepinephrine but is differentially suppressed by corticosterone relative to CRH, while hippocampal efferents tonically inhibit PVN AVP expression; in macrophages, elevated AVP reduces AHI1, impairing OTUD1-mediated deubiquitination and stabilization of Tyk2, thereby attenuating type-I interferon signaling.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper before extracting discoveries.\n\n**Classification:**\n\nThe gene AVP = Arginine Vasopressin (human/mammalian neuropeptide hormone).\n\n**KEEP** (papers about canonical AVP protein):\n- [3] AVP and Na+ channels in cortical collecting duct\n- [5] AVP mRNA regulation in PVN\n- [7] Nucleotide receptor inhibits AVP-stimulated water permeability\n- [9] AVP effects on ACTH release via novel receptor\n- [11] CaSR attenuates AVP-induced AQP2 expression\n- [14] 3H-AVP binding sites in rat brain\n- [15] Neuropeptides VIP and AVP in circadian clock\n- [18] Expression cloning of AVP-activated Ca2+-mobilizing receptor\n- [19] AVP and oxytocin on insulin release via V1b receptors\n- [24] AVP V1a receptor binding in hamster aggression\n- [26] AVP-induced Ca fluxes and contraction of mesangial cells\n- [28] AVP induces reduction of AHI1, affecting IFN-I signaling\n- [37] AVP V1a, OT, 5-HT1A receptor binding and aggression\n- [38] ADH/AVP on solute permeability in frog skin (ADH=antidiuretic hormone=AVP here)\n- [42] NPY and AVP in hypothalamo-neurohypophysial axis\n- [43] Epinephrine inhibits AVP-stimulated Na+ and water transport\n- [44] AVP gene transcription in PVN during emotional stress\n- [46] AVP receptor antagonists as aquaretics\n- [47] c-fos expression in AVP neurons induced by LPS\n- [48] NE-induced CRH and AVP gene transcription\n- [53] Polycomb binding precedes early-life stress responsive DNA methylation at Avp enhancer\n- [54] PGE2 reverses AVP inhibition of HCO3- absorption via PKC\n- [55] Nicotine stimulates corticosterone via CRH and AVP receptors\n- [61] Apelin-17 analog decreases AVP-induced antidiuresis\n- [62] Limitations of Avp-IRES2-Cre models\n- [63] AVP depletion in SCN affects PVN and ACTH release\n- [64] AVP-induced pulmonary vasodilation during V1 receptor block\n- [66] Cell volume during ADH-stimulated water reabsorption (ADH=AVP)\n- [69] V2 receptor antagonist radioligand binding\n- [70] Na,K-ATPase AVP unresponsiveness in nephrotic rats\n- [73] ADH/aldosterone control of Na+ and water in tight epithelia (ADH=AVP)\n- [75] AVP and AVPR1a molecular variation in New World monkeys\n- [76] Dual angiotensin II/AVP receptor in kidney\n- [77] AVP effects on PGE2 synthesis in CCD\n- [80] Brain angiotensin in thirst and AVP release\n- [85] AVP secretion with mutants of wild-type and Brattleboro AVP gene\n- [86] Mutations in AVP-NPII gene in diabetes insipidus\n- [89] TGFalpha and AVP in SCN\n- [90] Signaling path of AVP on distal K+ secretion\n- [91] Autosomal dominant neurohypophyseal diabetes insipidus linked to chr 20p13\n- [94] AVP V1A or V2 receptor antagonism in SHR hypertension\n- [96] Chronic central AVP on maternal behavior\n- [98] Oestrogen inhibits salt-dependent hypertension via GABAergic AVP neurons\n\n**EXCLUDE** (ADH = alcohol dehydrogenase or other unrelated genes, NLRP3 papers, plant ADH, phage, etc.):\n- [1] Maize/sorghum adh genomics — plant ADH\n- [2] Arabidopsis Adh promoter — plant ADH\n- [4] ADH/ALDH in cancer — alcohol dehydrogenase\n- [6] Drosophila Adh promoters — fly ADH\n- [8] Plant ADH gene family\n- [10] ADH cluster genes and alcohol dependence — alcohol dehydrogenase\n- [12] Drosophila Adh genetic analysis — fly ADH\n- [13] Thermoanaerobacter ADH — bacterial ADH\n- [16] Arabidopsis Adh G-box — plant ADH\n- [17] Drosophila Adh mutation — fly ADH\n- [20] Lactobacillus phage phi adh — bacterial phage\n- [21] Lactobacillus gusA — bacterial\n- [22] Ethanol/JNK/ADH — alcohol dehydrogenase\n- [23] CaSR knock-in ADH mice — \"ADH\" here = Autosomal Dominant Hypocalcemia (not AVP)\n- [25] Arabidopsis Adh G-box binding — plant ADH\n- [27] ADH/ALDH genotype in alcohol-related problems — alcohol dehydrogenase\n- [29] Aldosterone and ADH in cattle — ADH here is antidiuretic hormone but paper is purely observational/expression\n- [30] ALDH2/ADH1B in esophageal cancer — alcohol dehydrogenase\n- [31] Arabis/Arabidopsis Adh locus — plant ADH\n- [32] Drosophila ADH expression variation — fly ADH\n- [33] Drosophila Adh nucleotide sequence — fly ADH\n- [34] Drosophila Adh RNA alleles — fly ADH\n- [35] Cactophilic Drosophila Adh — fly ADH\n- [36] Drosophila Adh molecular variation — fly ADH\n- [39] Drosophila Adh enhancer/silencer — fly ADH\n- [40] DRD2/ADH/ALDH in alcoholism — alcohol dehydrogenase\n- [41] Drosophila Adh variants — fly ADH\n- [45] Drosophila mojavensis Adh — fly ADH\n- [49] Drosophila mojavensis Adh population genetics — fly ADH\n- [50] Drosophila Adh genetic control — fly ADH\n- [51] ADH isoenzymes in liver cancer sera — alcohol dehydrogenase\n- [52] ADH isoenzymes in gastric cancer — alcohol dehydrogenase\n- [56] CYP2A6/ADH human variability — alcohol dehydrogenase\n- [57] Pichia stipitis ADH genes — yeast ADH\n- [58] Gossypium ADH phylogeny — plant ADH\n- [59] ADH/ALDH2 transgenic models in cardiomyopathy — alcohol dehydrogenase\n- [60] Drosophila hydei Adh region — fly ADH\n- [65] vB_AviM_AVP phage — EXCLUDE: \"AVP\" is a phage name, not the gene\n- [67] ADH isoenzymes in esophageal cancer — alcohol dehydrogenase\n- [68] Wheat Adh gene — plant ADH\n- [71] Drosophila Adh latitudinal variation — fly ADH\n- [72] PQQ-ADH in Acetobacter — bacterial ADH\n- [74] ADH/ALDH in Southwest California Indians — alcohol dehydrogenase\n- [78] Arabidopsis Adh null mutants — plant ADH\n- [79] ADH isoenzymes in colorectal cancer — alcohol dehydrogenase\n- [81] AvP software package — bioinformatics tool, not the gene\n- [82] Saccharomyces ADH evolution — yeast ADH\n- [83] Drosophila guanche Adh region — fly ADH\n- [84] Arabidopsis Arvp/lipid homeostasis — plant, different gene\n- [87] Drosophila Adh gene regulation — fly ADH\n- [88] Cardiac ADH transgene in aging — alcohol dehydrogenase\n- [92] Pichia pastoris ADH genes — yeast ADH\n- [93] ADH isoenzymes in pancreas — alcohol dehydrogenase\n- [95] ADH 1/3 kinetics in ethanol metabolism — alcohol dehydrogenase\n- [97] ADH gene variants and alcohol phenotypes — alcohol dehydrogenase\n- [99] Pyrus Adh molecular evolution — plant ADH\n- [100] Arabidopsis Adh nucleosome — plant ADH\n\n**Gene2pubmed additional papers — ALL EXCLUDE**: These are all NLRP3 inflammasome papers, cDNA library, GO annotation, and interactome papers — none are about AVP.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1984,\n      \"finding\": \"AVP stimulates pituitary ACTH release through a receptor that is pharmacologically distinct from classical V1 (pressor) and V2 (antidiuretic) receptors. V1-antagonists only partially inhibited AVP-induced ACTH secretion, the V2 agonist dDAVP was 20–30-fold less potent than AVP, and oxytocin was only 4–8-fold less potent, together indicating AVP acts on corticotrope cells via a novel receptor subtype (later identified as V1b/V3).\",\n      \"method\": \"In vitro pharmacological antagonism assay using rat anterior pituitary gland segments with selective V1/V2 antagonists and agonists, measuring ACTH secretion by RIA\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — rigorous in vitro pharmacological characterization with multiple selective ligands; foundational paper replicated and extended by subsequent work defining V1b receptor\",\n      \"pmids\": [\"6089144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"AVP induces rapid, concentration-dependent increases in intracellular Ca2+ ([Ca2+]i) and Ca2+ efflux in glomerular mesangial cells and causes cell contraction exclusively through V1 (pressor) receptors. This effect occurs partly via Ca2+ release from intracellular stores (even in Ca2+-free medium) and partly via Ca2+ influx; dantrolene (blocker of ER Ca2+ release) inhibited both Ca2+ efflux and contraction, whereas verapamil (Ca2+ channel blocker) only partially inhibited Ca2+ influx.\",\n      \"method\": \"Direct measurement of [Ca2+]i in adherent cultured mesangial cells, 45Ca2+ efflux assay, V1-selective antagonist d(CH2)5Tyr(Me)AVP, dantrolene and verapamil pharmacology, cell contraction assay\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Ca2+ imaging, isotope flux, pharmacological dissection) in a single rigorous study\",\n      \"pmids\": [\"3394807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"AVP and mineralocorticoids both stimulate Na+ transport in the cortical collecting duct by increasing the number and kinetic properties (open probability) of amiloride-sensitive Na+ channels in the apical membrane, but through distinct molecular mechanisms that allow synergism: AVP acts via cAMP/PKA to recruit quiescent channels and increase their open probability, while mineralocorticoids act via genomic pathways to synthesize new channels.\",\n      \"method\": \"Electrophysiological patch-clamp recording of apical Na+ channels combined with biochemical second-messenger studies in isolated perfused rat cortical collecting duct\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — combines electrophysiology and biochemistry; represents synthesis of multiple studies; extensively replicated field\",\n      \"pmids\": [\"1313121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Hippocampal efferents travelling in the lateral fimbria-fornix tonically inhibit AVP mRNA expression in the medial parvocellular paraventricular nucleus (PVN). Lateral fimbria-fornix lesions, but not medial lesions or corticohypothalamic tract sections, increased both CRH mRNA and AVP mRNA in the PVN and elevated ACTH secretion, placing the hippocampal–lateral fornix–PVN AVP circuit as an inhibitory node in HPA axis regulation.\",\n      \"method\": \"Selective forebrain fiber tract lesions combined with semi-quantitative in situ hybridization histochemistry for CRH and AVP mRNA, and plasma ACTH RIA in rats\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — lesion-based epistasis with defined molecular readout (mRNA by ISH) and hormonal output; single study\",\n      \"pmids\": [\"1333341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"AVP-stimulated water permeability (Pf) in the inner medullary collecting duct is inhibited by extracellular nucleotides (ATP, UTP but not ADP) acting via P2u nucleotide receptors. This inhibition is upstream of cAMP: ATP decreased AVP-stimulated cAMP levels by ~32%, did not affect the Pf response to membrane-permeant cAMP analogues, and was abolished by the PKC inhibitor calphostin C, indicating the nucleotide receptor activates the phosphoinositide/PKC pathway to suppress adenylate cyclase coupling to the V2 receptor.\",\n      \"method\": \"In vitro perfusion of terminal IMCD tubules, osmotic water permeability measurements, cAMP assay in IMCD suspensions, PKC inhibitor calphostin C, cAMP analogue and forskolin controls\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstituted tubule perfusion with mechanistic dissection via multiple pharmacological probes and cAMP measurement; strong internal controls\",\n      \"pmids\": [\"8594881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Epinephrine inhibits AVP-stimulated Na+ transport and osmotic water permeability in the cortical collecting duct via α2-adrenergic receptors. At low doses (100 nM) yohimbine (α2-antagonist) reversed the effect; epinephrine increased luminal membrane fractional resistance equivalently to amiloride, indicating blockade of apical amiloride-sensitive Na+ conductance. Residual (~40%) inhibition of cAMP-stimulated transport by epinephrine at high concentrations pointed to at least one additional intracellular messenger beyond adenylate cyclase inhibition.\",\n      \"method\": \"In vitro perfused cortical collecting ducts from Dahl-Rapp SS, SR and Sprague-Dawley rats; transepithelial voltage, Na+ flux, and water permeability measurements; 8-BrcAMP substitution; yohimbine pharmacology; amiloride comparison\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isolated tubule electrophysiology with pharmacological dissection; single study\",\n      \"pmids\": [\"8105698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Emotional stress rapidly increases AVP gene transcription (assessed by intronic heteronuclear RNA) in the paraventricular nucleus within 2 hours, preceding changes in cytoplasmic mRNA. This finding positioned transcriptional upregulation of the AVP gene as an acute molecular response mediating activation of the HPA axis during psychological stress.\",\n      \"method\": \"In situ hybridization with an intronic riboprobe (complementary to an AVP intron sequence) to detect AVP hnRNA as a surrogate for nascent gene transcription in rat PVN following novel environment stress\",\n      \"journal\": \"Acta endocrinologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct measurement of transcription rate via intronic probe in defined brain nuclei; single study but methodologically sound\",\n      \"pmids\": [\"8317194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"AVP stimulates PGE2 synthesis in isolated rabbit cortical collecting tubules through a V1-type receptor pathway rather than V2/cAMP. dDAVP (a selective V2 agonist) elicited only a very weak response at high doses, whereas AVP produced an immediate, transient, dose-dependent stimulation (~150–200% above baseline) of PGE2 synthesis requiring exogenous arachidonic acid, indicating the PGE2 response is coupled to V1 receptor-linked phospholipase activation.\",\n      \"method\": \"Superfusion of microdissected rabbit cortical collecting tubules, enzyme immunoassay for PGE2, comparison of AVP vs. dDAVP dose-response\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct tubule functional assay with pharmacological receptor subtype dissection; single lab\",\n      \"pmids\": [\"2500029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Expression cloning from rabbit renal medulla identified a novel AVP-activated, calcium-mobilizing receptor protein (VACM-1, 780 amino acids) that is distinct from V1 and V2 AVP receptors. When expressed in Xenopus oocytes or COS-1 cells, VACM-1 conferred high-affinity AVP binding (Kd ~2 nM) and AVP-induced intracellular Ca2+ mobilization; immunohistochemistry localized VACM-1 to collecting tubule epithelia.\",\n      \"method\": \"Expression cloning in Xenopus oocyte system, COS-1 cell transfection, 125I-AVP binding assay, Ca2+ mobilization assay, in vitro translation with immunoprecipitation, immunohistochemistry\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — expression cloning with functional reconstitution in two heterologous systems and direct binding characterization; multiple orthogonal methods in one study\",\n      \"pmids\": [\"7611460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Both AVP and oxytocin stimulate insulin release from the perfused rat pancreas and from RINm5F cells exclusively through V1b (V3) receptors, not V1a or oxytocin receptors. The selective V1b antagonist dP[Tyr(Me)2]AVP abolished insulin release by both peptides, the V1a antagonist was inactive, and the V1b agonist d[D-3-Pal]VP dose-dependently stimulated insulin release, defining V1b as the functional receptor on pancreatic β-cells.\",\n      \"method\": \"Perfused rat pancreas preparation, RINm5F cell insulin release assay, systematic pharmacological profiling with selective V1b, V1a, and oxytocin receptor antagonists and agonists; RIA for insulin\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous pharmacological receptor identification in two systems with multiple selective ligands; strong internal controls\",\n      \"pmids\": [\"8572202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"PGE2 reverses AVP-mediated inhibition of HCO3- absorption in the medullary thick ascending limb by activating protein kinase C (PKC), which in turn inhibits AVP-stimulated cAMP production via a Gi-dependent mechanism. PKC inhibitors (staurosporine, chelerythrine) blocked the PGE2 reversal, the PKC activator PMA mimicked PGE2, and pertussis toxin abolished the PMA effect, demonstrating PKC→Gi→↓cAMP as the signaling cascade.\",\n      \"method\": \"In vitro perfusion of rat MTAL segments, measurement of HCO3- absorption, PKC inhibitors staurosporine and chelerythrine, phorbol ester PMA, pertussis toxin pretreatment, comparison with forskolin\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — intact tubule functional assay with convergent pharmacological evidence from inhibitors, activators, and toxin; multiple orthogonal interventions\",\n      \"pmids\": [\"8764317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Both intact neurophysin (NP) coding region and the vasopressin (VP) coding region are required for proper AVP precursor processing and secretion. In COS cells transfected with Brattleboro (BB) rat AVP gene (which has a single guanine deletion in NP causing frameshift and loss of stop codon), no AVP was secreted; restoring a stop codon at the equivalent of the normal VP+NP length partially rescued secretion, whereas VP coding region alone was insufficient. This demonstrated that the BB frameshift in NP—not simply loss of glycopeptide coding region—is the molecular basis of diabetes insipidus in these rats.\",\n      \"method\": \"COS cell transfection with wild-type and mutated BB AVP gene constructs (systematic stop-codon insertion mutagenesis), AVP secretion measured by RIA, co-transfected β-galactosidase as internal control\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with functional secretion readout; multiple constructs tested with internal controls\",\n      \"pmids\": [\"9402088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"AVP produced in suprachiasmatic nucleus (SCN) neurons tonically inhibits the CRH-adrenocorticotrope axis. Functional lesioning of SCN AVP neurons with AVP antibody–toxin conjugate decreased SCN AVP immunoreactive content and mRNA, increased CRH mRNA and decreased median eminence CRH immunoreactivity, and doubled plasma ACTH, positioning SCN-derived AVP as a direct upstream inhibitor of PVN CRH neurons.\",\n      \"method\": \"Targeted cytotoxic monoclonal antibody (anti-AVP) microinjection into rat SCN, AVP immunohistochemistry and RIA, AVP mRNA in situ hybridization, CRH mRNA ISH, CRH immunohistochemistry, plasma ACTH RIA\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — targeted functional lesion with multiple molecular readouts; single lab\",\n      \"pmids\": [\"9404718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"A dual angiotensin II/AVP receptor in the renal outer medullary thick ascending limb and inner medullary collecting duct responds equally to both Ang II and AVP; pharmacologically it behaves as a V2-type AVP receptor (displaced by DVDAVP) and a novel AT1-type angiotensin receptor coupled to adenylate cyclase (displaced by losartan but not PD 123319), distinct from prototype Ca2+-mobilizing AT1 receptors.\",\n      \"method\": \"Radioligand displacement binding assays with [3H]AVP and 125I-Ang II, selective V2 analogue DVDAVP, AT1 antagonist losartan, AT2 antagonist PD 123319, immunocytochemistry of renal sections\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — radioligand binding with pharmacological profiling and tissue localization; single study\",\n      \"pmids\": [\"9095083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Norepinephrine microinjected into the rat PVN differentially regulates CRH and AVP gene transcription: it strongly increases CRH hnRNA but does not affect AVP hnRNA in adrenal-intact animals. Removing the corticosterone feedback (adrenalectomy with basal corticosterone replacement) unmasked a significant NE-induced increase in AVP hnRNA, demonstrating that corticosterone exerts greater suppressive control over AVP gene transcription than over CRH, thereby explaining differential secretagogue regulation of the HPA axis.\",\n      \"method\": \"Intra-PVN norepinephrine microinjection in conscious rats, semi-quantitative in situ hybridization with intron-specific riboprobes for CRH and AVP hnRNA, adrenalectomy with subcutaneous corticosterone pellet model\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo intervention with molecular transcription readout using intronic probes; single lab but well-controlled\",\n      \"pmids\": [\"11295232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AVP stimulates distal tubular K+ secretion via luminal V1 receptors through a PLC/Ca2+/PKC signaling pathway, not through adenylate cyclase/cAMP/PKA. In vivo microperfusion showed that PKC inhibitor staurosporine (45% inhibition) and the Ca2+ chelator BAPTA (41% inhibition) blocked AVP-stimulated K+ flux, while the PKA inhibitor H89 had no effect; AVP-stimulated K+ secretion was further reduced by BK (maxi-K) channel blockers TEA and iberiotoxin, identifying the downstream effector channel.\",\n      \"method\": \"In vivo stationary microperfusion of rat cortical distal tubules, double-barreled K+-selective microelectrodes, selective inhibitors for PKA (H89), PKC (staurosporine), Ca2+ chelation (BAPTA), and BK channel blockers (TEA, iberiotoxin)\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vivo tubule electrophysiology with comprehensive signaling pathway dissection using multiple pharmacological probes; clearly identifies pathway and effector channel\",\n      \"pmids\": [\"15253724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Repeated agonistic encounters (dominant experience) selectively increase AVP V1a receptor binding in the lateral ventromedial hypothalamus (VMHL) of dominant hamsters compared to subordinates, independent of testosterone levels. Acute social defeat alone does not alter V1a receptor binding, indicating that experience-dependent plasticity in V1a receptor density in a specific hypothalamic nucleus correlates with and may mediate the behavioral changes associated with repeated social victory.\",\n      \"method\": \"Radioligand receptor autoradiography with [125I]linear AVP across multiple brain regions, plasma testosterone RIA, controlled dominant/subordinate agonistic encounter paradigm in Syrian hamsters\",\n      \"journal\": \"Hormones and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct receptor binding measurement with regional specificity and behavioral correlate; single lab\",\n      \"pmids\": [\"15935353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The calcium-sensing receptor (CaSR) attenuates AVP-induced aquaporin-2 (AQP2) expression in cortical collecting duct principal cells via a calmodulin-dependent mechanism. High extracellular Ca2+ or CaSR agonists (neomycin, Gd3+) reduced AVP-induced cAMP accumulation and AQP2 mRNA/protein; this was not due to phosphodiesterase activation or direct adenylate cyclase inhibition, but was prevented by calmodulin inhibition; CaSR gene silencing abolished the effect.\",\n      \"method\": \"Mouse cortical collecting duct cell line (mpkCCDcl4), CaSR agonist pharmacology, CaSR gene silencing (siRNA), cAMP measurement, AQP2 mRNA and protein quantification, phosphodiesterase and adenylate cyclase pharmacological dissection, calmodulin inhibitor\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (siRNA, pharmacology, mRNA, protein, cAMP) in a single study; loss-of-function confirms mechanism\",\n      \"pmids\": [\"18032798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Polycomb group (PcG) complex binding at the Avp downstream enhancer precedes and primes the emergence of early-life stress (ELS)-responsive DNA methylation at that locus. In an embryonic stem cell-derived hypothalamic-like differentiation model, PcG occupancy correlated with gene silencing and co-occurred with Tet protein binding (preventing premature DNA methylation); differentiation evicted PcG complexes, leading to DNMT recruitment and enhancer methylation, then increased MeCP2 binding—establishing the epigenetic sequence controlling Avp enhancer programming.\",\n      \"method\": \"ESC-derived hypothalamic-like differentiation model, chromatin immunoprecipitation (ChIP) for PcG proteins (EZH2, SUZ12), Tet1/Tet2, MeCP2, DNMT3a/b; bisulfite sequencing for DNA methylation; in vivo mouse experiments; Avp mRNA quantification\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP combined with in vitro differentiation model and in vivo validation; single lab but multiple molecular endpoints\",\n      \"pmids\": [\"24599304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Activating the apelin receptor (apelin-R) with a metabolically stable apelin-17 analog (LIT01-196) opposes AVP-mediated antidiuresis by decreasing dDAVP-induced cAMP production and reducing apical cell-surface expression of phosphorylated aquaporin-2 in collecting duct cells via V2 receptor modulation, thereby increasing aqueous diuresis and correcting experimental hyponatremia.\",\n      \"method\": \"In vivo rat pharmacokinetics (subcutaneous administration), collecting duct cell cAMP assay, AQP2 phosphorylation and membrane trafficking by immunofluorescence, rat model of AVP-induced hyponatremia with urinary osmolality and serum sodium measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional in vitro and in vivo studies with molecular endpoint (AQP2 trafficking, cAMP); single lab\",\n      \"pmids\": [\"33436646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Oestrogen inhibits salt-dependent hypertension by suppressing GABAergic excitation in hypothalamic magnocellular AVP neurons. DOCA-salt treatment converted GABAergic inhibition to excitation in AVP neurons (due to increased NKCC1/decreased KCC2 expression shifting the chloride equilibrium potential), raised plasma AVP and blood pressure; oestrogen reversed all these effects by modulating NKCC1 and KCC2 activity/expression, and the KCC2 activator CLP290 phenocopied oestrogen.\",\n      \"method\": \"Rat DOCA-salt uninephrectomy hypertension model, whole-cell patch-clamp electrophysiology of AVP neurons in hypothalamic slices, GABA equilibrium potential measurement, plasma AVP RIA, blood pressure measurement, Western blotting for NKCC1/KCC2, in vivo CLP290 treatment\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — electrophysiology in identified AVP neurons combined with molecular mechanism (NKCC1/KCC2) and in vivo pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"32960965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Depression-associated elevations in AVP reduce AHI1 expression in macrophages, thereby impairing type-I interferon (IFN-I) antiviral signaling. Mechanistically, AHI1 recruits the deubiquitinase OTUD1 to stabilize Tyk2; AVP-driven AHI1 reduction leads to Tyk2 destabilization and attenuated IFN-I signaling. This identifies an AVP→AHI1→OTUD1→Tyk2→IFN-I axis connecting depression-related neuropeptide signaling to innate antiviral immunity.\",\n      \"method\": \"PBMCs and macrophages from MDD patients, depression model mice (CUMS), AHI1 knockdown/overexpression, Co-IP to demonstrate AHI1–OTUD1–Tyk2 interaction, ubiquitination assays, IFN-I signaling readouts (STAT1 phosphorylation), AVP treatment of macrophages, meptazinol pharmacology\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic signaling pathway defined by Co-IP, ubiquitination assay, KD/KO with defined molecular phenotype, validated in human patient samples and mouse model\",\n      \"pmids\": [\"35821088\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AVP (arginine vasopressin) is a nonapeptide whose precursor requires both the vasopressin and intact neurophysin coding regions for proper processing and secretion; it signals through at least three receptor subtypes (V1a, V1b/V3, and V2) coupled to distinct intracellular pathways — V1a/V1b via PLC/Ca2+/PKC (mediating mesangial contraction, K+ secretion, corticotrope ACTH release, and PGE2 synthesis), V2 via adenylate cyclase/cAMP/PKA (mediating water reabsorption through AQP2 trafficking and Na+ channel regulation in collecting duct) — with additional modulation by nucleotide receptors (P2u/PKC), PGE2 (PKC→Gi→↓cAMP), calmodulin-dependent CaSR signaling, and GABAergic chloride homeostasis (NKCC1/KCC2) in magnocellular AVP neurons; at the gene level, AVP transcription is tonically inhibited by hippocampal efferents and corticosterone, acutely upregulated by stress and norepinephrine, and epigenetically programmed via a polycomb-primed, ELS-responsive methylation mechanism at a downstream enhancer, while peripherally AVP reduces AHI1 in macrophages to destabilize Tyk2 and attenuate IFN-I antiviral signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AVP (arginine vasopressin) is a nonapeptide hormone that regulates water and electrolyte homeostasis, blood pressure, pituitary ACTH release, insulin secretion, and innate immune signaling through pharmacologically distinct receptor subtypes coupled to divergent intracellular cascades. V2 receptors in the renal collecting duct activate adenylate cyclase/cAMP to increase aquaporin-2-mediated water reabsorption and amiloride-sensitive Na+ channel activity [PMID:8594881, PMID:1313121, PMID:18032798], while V1-class receptors signal through PLC/Ca²⁺/PKC to drive mesangial cell contraction, distal K+ secretion via BK channels, PGE2 synthesis, and—via V1b receptors on corticotropes and pancreatic β-cells—ACTH and insulin release [PMID:3394807, PMID:15253724, PMID:6089144, PMID:8572202]. Proper AVP secretion requires intact vasopressin and neurophysin coding regions of the precursor, as the Brattleboro frameshift in the neurophysin domain abolishes processing and secretion [PMID:9402088]. Hypothalamic AVP transcription is rapidly activated by stress and norepinephrine but tonically inhibited by hippocampal efferents and preferentially suppressed by corticosterone; in macrophages, elevated AVP reduces AHI1, impairing OTUD1-mediated Tyk2 stabilization and thereby attenuating type-I interferon signaling [PMID:8317194, PMID:1333341, PMID:11295232, PMID:35821088].\",\n  \"teleology\": [\n    {\n      \"year\": 1983,\n      \"claim\": \"Demonstrating that specific, divalent-cation-dependent AVP binding sites exist in brain subcellular fractions with region-specific distributions established that AVP acts centrally through discrete membrane-associated receptors, not merely as a circulating hormone.\",\n      \"evidence\": \"Subcellular fractionation and ³H-AVP radioligand binding with Scatchard analysis across rat brain regions\",\n      \"pmids\": [\"6415623\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No functional consequence linked to subcellular binding distribution\", \"Single lab without independent replication\", \"Receptor molecular identity not determined\"]\n    },\n    {\n      \"year\": 1984,\n      \"claim\": \"Identifying a pharmacologically distinct AVP receptor on pituitary corticotropes (later designated V1b/V3) resolved how AVP stimulates ACTH secretion through a pathway separate from classical V1 pressor and V2 antidiuretic receptors.\",\n      \"evidence\": \"In vitro anterior pituitary segment assay with selective V1 antagonists and AVP analogues\",\n      \"pmids\": [\"6089144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular cloning of V1b receptor not yet accomplished\", \"Intracellular signaling cascade downstream of V1b not defined\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Demonstrating that AVP raises intracellular Ca²⁺ in mesangial cells exclusively via V1 receptors—through both intracellular store release and non-voltage-gated Ca²⁺ influx—established the V1/PLC/Ca²⁺ axis as the effector mechanism for glomerular contractile responses.\",\n      \"evidence\": \"Fura-2 Ca²⁺ imaging, ⁴⁵Ca²⁺ efflux, V1 antagonist, dantrolene, verapamil, and Ca²⁺-free medium in mesangial cells\",\n      \"pmids\": [\"3394807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream contractile effectors not identified\", \"Relative contribution of store release vs. influx to sustained contraction unclear\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Showing that AVP stimulates PGE2 synthesis in cortical collecting duct through V1 rather than V2 receptors revealed a local paracrine feedback mechanism opposing V2-mediated water transport.\",\n      \"evidence\": \"Superfused isolated rabbit CCD with PGE2 immunoassay, comparing AVP to V2-selective dDAVP\",\n      \"pmids\": [\"2500029\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific V1 receptor subtype (V1a vs V1b) not distinguished\", \"Downstream cyclooxygenase isoform not identified\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Two parallel advances defined the dual regulatory axis of AVP: (1) AVP stimulates apical Na⁺ channels in the collecting duct by mechanisms distinct from aldosterone, explaining synergistic Na⁺ reabsorption; (2) hippocampal efferents tonically inhibit PVN AVP mRNA expression, positioning the hippocampus as an upstream brake on HPA-axis AVP drive.\",\n      \"evidence\": \"(1) Patch-clamp in perfused CCD; (2) selective lateral fimbria-fornix lesions with in situ hybridization for AVP mRNA and plasma ACTH measurement\",\n      \"pmids\": [\"1313121\", \"1333341\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of Na⁺ channel subunit modulated by AVP not determined\", \"Neurotransmitter mediating hippocampal inhibition of PVN AVP neurons not identified\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Detection of rapid increases in AVP heteronuclear RNA in the PVN after emotional stress established that AVP gene transcription is acutely stress-responsive, complementing the known role of CRH in HPA activation.\",\n      \"evidence\": \"In situ hybridization with intronic AVP hnRNA probe in emotionally stressed rats\",\n      \"pmids\": [\"8317194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcription factors mediating rapid AVP gene activation not identified\", \"Relative kinetic contribution of AVP vs CRH transcription to ACTH output not quantified\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Three discoveries in 1995 expanded understanding of AVP receptor diversity and signaling modulation: (1) expression cloning identified VACM-1, a novel Ca²⁺-coupled renal AVP receptor distinct from V1/V2; (2) V1b receptors were shown to mediate AVP-stimulated insulin release from pancreatic β-cells; (3) extracellular ATP/UTP via P2u receptors was shown to inhibit AVP-stimulated water permeability by activating PKC to reduce cAMP in collecting duct.\",\n      \"evidence\": \"(1) Xenopus oocyte expression cloning with Ca²⁺ and binding assays; (2) perfused rat pancreas with selective V1b agonists/antagonists; (3) perfused IMCD with cAMP assays and PKC inhibitor calphostin C\",\n      \"pmids\": [\"7611460\", \"8572202\", \"8594881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"VACM-1 physiological role and downstream signaling cascade largely uncharacterized\", \"V1b coupling mechanism in β-cells not fully elucidated\", \"P2u receptor identity at the molecular level in IMCD not confirmed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Two studies resolved key questions about AVP precursor processing and receptor complexity: (1) systematic mutagenesis showed that both vasopressin and neurophysin coding regions are required for precursor processing and secretion, explaining the Brattleboro rat defect; (2) a dual angiotensin-II/AVP receptor with V2/AT1 pharmacology coupled to adenylate cyclase was characterized in renal medulla.\",\n      \"evidence\": \"(1) COS cell transfection with deletion/insertion constructs and AVP RIA; (2) radioligand binding with losartan and DVDAVP competition plus immunocytochemistry\",\n      \"pmids\": [\"9402088\", \"9095083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of neurophysin-dependent folding not structurally resolved\", \"Dual AngII/AVP receptor molecular identity and in vivo significance not established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Corticosterone was shown to preferentially suppress AVP (but not CRH) gene transcription in response to noradrenergic PVN stimulation, and SCN-derived AVP was established as an inhibitor of the CRH-ACTH axis, revealing two distinct inhibitory circuits converging on hypothalamic AVP.\",\n      \"evidence\": \"PVN norepinephrine microinjection in sham vs adrenalectomized rats with hnRNA probes; SCN immunotoxin ablation with ACTH and CRH mRNA measurements\",\n      \"pmids\": [\"11295232\", \"9404718\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Glucocorticoid response element or epigenetic mechanism mediating selective AVP suppression not identified\", \"SCN AVP signaling mechanism at PVN target neurons not characterized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that luminal AVP stimulates distal tubule K⁺ secretion via V1 receptors and the PLC/Ca²⁺/PKC pathway acting on BK channels resolved the effector channel and signaling cascade for AVP-dependent K⁺ handling.\",\n      \"evidence\": \"In vivo stationary microperfusion with K⁺-selective microelectrodes, PKC/PKA inhibitors, BAPTA, iberiotoxin\",\n      \"pmids\": [\"15253724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether V1a or V1b mediates the effect not distinguished\", \"Direct PKC phosphorylation site on BK channel not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that calcium-sensing receptor (CaSR) activation attenuates V2-stimulated AQP2 expression by reducing V2R–adenylate cyclase coupling through a calmodulin-dependent mechanism explained how hypercalcemia causes nephrogenic diabetes insipidus-like resistance to AVP.\",\n      \"evidence\": \"CaSR siRNA knockdown, cAMP assays, calmodulin/PDE/AC inhibitors, AQP2 mRNA and protein quantification in mpkCCDcl4 cells\",\n      \"pmids\": [\"18032798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Calmodulin target (G-protein, AC isoform, or receptor itself) not identified\", \"In vivo confirmation in CaSR gain-of-function models not provided\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating that early-life stress causes sustained hypomethylation at a downstream Avp enhancer—gated by Polycomb-to-DNMT switching during hypothalamic differentiation—provided an epigenetic mechanism for persistent AVP overexpression and HPA hyperactivation following adversity.\",\n      \"evidence\": \"ES cell-derived hypothalamic differentiation, ChIP for Polycomb/Tet proteins, bisulfite sequencing, early-life stress mouse model\",\n      \"pmids\": [\"24599304\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of transcription factors binding the demethylated enhancer not determined\", \"Causal rescue by re-methylation not demonstrated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Two studies identified new physiological brakes on AVP action: (1) apelin receptor activation opposes V2R-mediated cAMP and AQP2 phosphorylation in collecting duct, counteracting antidiuresis; (2) oestrogen prevents excessive AVP secretion from magnocellular neurons by modulating NKCC1/KCC2 chloride transporter balance, explaining sex differences in salt-sensitive hypertension.\",\n      \"evidence\": \"(1) Collecting duct cAMP/AQP2 assays plus AVP-induced hyponatremia rescue in rats; (2) electrophysiology of hypothalamic AVP neurons, NKCC1/KCC2 expression, V1a antagonist and KCC2 activator in DOCA-salt model\",\n      \"pmids\": [\"33436646\", \"32960965\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Apelin receptor signaling pathway inhibiting V2R-AC coupling not identified\", \"Whether oestrogen acts directly on AVP neurons or through interneurons not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying that elevated AVP in depression reduces macrophage AHI1, disrupting OTUD1-mediated deubiquitination and stabilization of Tyk2, and thereby attenuating type-I interferon signaling, established a neuroendocrine-immune axis linking AVP to innate antiviral immunity.\",\n      \"evidence\": \"PBMCs from MDD patients, depression mouse model, Co-IP for AHI1-OTUD1-Tyk2, ubiquitination assays, IFN-I signaling\",\n      \"pmids\": [\"35821088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"AVP receptor subtype mediating AHI1 suppression in macrophages not identified\", \"In vivo antiviral phenotype of AVP-elevated animals not tested\", \"Mechanism linking AVP receptor signaling to AHI1 transcriptional or post-transcriptional regulation unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of neurophysin-dependent AVP precursor folding, the molecular identity and physiological role of VACM-1 and the dual AngII/AVP receptor, the transcription factor network driving acute stress-induced AVP transcription, and which receptor subtype mediates AVP suppression of AHI1 in macrophages.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of AVP precursor folding intermediate\", \"VACM-1 knockout or loss-of-function phenotype not reported\", \"Transcription factor binding to stress-responsive AVP regulatory elements not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5, 7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 5, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 5, 7, 8]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 2, 8, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"AVPR1A\",\n      \"AVPR1B\",\n      \"AVPR2\",\n      \"AQP2\",\n      \"AHI1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"AVP encodes the vasopressin-neurophysin 2-copeptin precursor, a nonapeptide hormone that signals through V1a (PLC/Ca²⁺/PKC), V1b (PLC/Ca²⁺/PKC), and V2 (adenylate cyclase/cAMP/PKA) receptor subtypes to regulate water and electrolyte homeostasis, HPA axis output, and innate immunity. In the kidney, V2 receptor activation drives AQP2 trafficking and apical Na⁺ channel opening for water and sodium reabsorption, while V1 receptor signaling mediates mesangial cell contraction, PGE₂ synthesis, and K⁺ secretion through BK channels; these pathways are counter-regulated by nucleotide/P2u-PKC, PGE₂-PKC→Gᵢ, CaSR-calmodulin, and apelin receptor systems [PMID:3394807, PMID:1313121, PMID:8594881, PMID:8764317, PMID:15253724, PMID:18032798, PMID:33436646]. Proper precursor processing and secretion require both the vasopressin and neurophysin coding regions, and frameshift loss of neurophysin causes diabetes insipidus [PMID:9402088]. Peripherally, AVP suppresses macrophage AHI1 expression, destabilizing Tyk2 via loss of OTUD1-mediated deubiquitination and attenuating type-I interferon antiviral signaling [PMID:35821088].\",\n  \"teleology\": [\n    {\n      \"year\": 1984,\n      \"claim\": \"Identifying the receptor subtype mediating AVP-stimulated ACTH release resolved why V1 and V2 antagonists failed to fully block pituitary corticotrope activation, establishing the existence of a pharmacologically distinct third AVP receptor (later called V1b/V3).\",\n      \"evidence\": \"In vitro pharmacological antagonism assay on rat anterior pituitary segments with selective V1/V2 ligands, measuring ACTH by RIA\",\n      \"pmids\": [\"6089144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"V1b receptor gene had not yet been cloned\", \"downstream signaling cascade of V1b in corticotropes was not defined\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Demonstrating that AVP causes mesangial cell contraction through V1-mediated intracellular Ca²⁺ mobilization from ER stores and extracellular Ca²⁺ influx established the dual-source Ca²⁺ mechanism underlying AVP's glomerular hemodynamic effects.\",\n      \"evidence\": \"Ca²⁺ imaging, ⁴⁵Ca²⁺ efflux, V1-selective antagonist, dantrolene and verapamil pharmacology in cultured mesangial cells\",\n      \"pmids\": [\"3394807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"identity of the voltage-insensitive Ca²⁺ influx channel was unknown\", \"relevance to intact glomerular filtration rate regulation not directly tested\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Patch-clamp studies revealed that AVP acts via cAMP/PKA to recruit quiescent apical Na⁺ channels and increase their open probability in the collecting duct, distinguishing this mechanism from mineralocorticoid-driven de novo channel synthesis and explaining their synergism in sodium reabsorption.\",\n      \"evidence\": \"Electrophysiological patch-clamp and cAMP measurements in isolated perfused rat cortical collecting duct\",\n      \"pmids\": [\"1313121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"molecular identity of the Na⁺ channel pool recruited by AVP was unclear\", \"trafficking mechanism for channel insertion was not defined\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Selective lesion of the lateral fimbria-fornix revealed that hippocampal efferents tonically suppress AVP mRNA in the parvocellular PVN, establishing a neural circuit-level inhibitory input to AVP gene expression within the HPA axis.\",\n      \"evidence\": \"Selective forebrain fiber tract lesions with in situ hybridization for AVP and CRH mRNA, plasma ACTH RIA in rats\",\n      \"pmids\": [\"1333341\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"neurotransmitter identity of the inhibitory hippocampal projection was unknown\", \"single lesion study without chemogenetic or optogenetic confirmation\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Intronic hnRNA measurements showed that emotional stress rapidly induces AVP gene transcription within 2 hours in the PVN, positioning transcriptional activation as the acute molecular response coupling psychological stress to HPA axis output.\",\n      \"evidence\": \"In situ hybridization with intron-specific riboprobe for AVP hnRNA in rat PVN after novel environment stress\",\n      \"pmids\": [\"8317194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"upstream transcription factors driving stress-induced AVP transcription were not identified\", \"single stressor paradigm\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Nucleotide receptors (P2u) were found to oppose AVP-stimulated water permeability by activating PKC to suppress V2-coupled adenylate cyclase, revealing a paracrine brake on AVP antidiuresis in the inner medullary collecting duct.\",\n      \"evidence\": \"In vitro perfusion of terminal IMCD tubules with cAMP assay, PKC inhibitor calphostin C, cAMP analogue controls\",\n      \"pmids\": [\"8594881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"physiological source and regulation of luminal ATP/UTP was not defined\", \"whether P2u modulation operates in vivo was untested\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Systematic pharmacological profiling identified V1b as the sole AVP receptor subtype mediating insulin secretion from pancreatic β-cells, extending V1b function beyond corticotropes to endocrine pancreas.\",\n      \"evidence\": \"Perfused rat pancreas and RINm5F cells with selective V1b, V1a, and OT receptor antagonists/agonists; insulin RIA\",\n      \"pmids\": [\"8572202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"downstream intracellular signaling cascade from V1b to insulin granule exocytosis was not mapped\", \"physiological contribution of AVP to glucose homeostasis in vivo was not quantified\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"PGE₂ was shown to reverse AVP-mediated inhibition of bicarbonate absorption in the MTAL through a PKC→Gᵢ→↓cAMP cascade, defining a complete counter-regulatory signaling pathway downstream of prostaglandin receptors that modulates AVP actions in the thick ascending limb.\",\n      \"evidence\": \"In vitro perfused MTAL segments with PKC inhibitors, PMA, pertussis toxin, and forskolin controls\",\n      \"pmids\": [\"8764317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"specific EP receptor subtype responsible was not identified\", \"whether this pathway operates during in vivo prostaglandin elevations (e.g. NSAID withdrawal) was untested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Mutagenesis of the Brattleboro AVP gene demonstrated that the neurophysin coding region is essential for precursor processing and secretion, establishing the molecular basis of autosomal recessive diabetes insipidus as a frameshift-induced protein-folding defect rather than simple loss of the glycopeptide.\",\n      \"evidence\": \"COS cell transfection with systematic stop-codon insertion constructs, AVP secretion by RIA\",\n      \"pmids\": [\"9402088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"precise folding intermediate trapped by the frameshift-extended neurophysin was not structurally resolved\", \"ER stress consequences of misfolded precursor were not examined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that corticosterone selectively gates norepinephrine-induced AVP (but not CRH) transcription in the PVN explained the differential regulation of the two HPA secretagogues and positioned glucocorticoid feedback as a preferential brake on AVP gene expression.\",\n      \"evidence\": \"Intra-PVN norepinephrine microinjection with intronic hnRNA ISH in adrenal-intact vs. adrenalectomized rats with corticosterone replacement\",\n      \"pmids\": [\"11295232\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"glucocorticoid response element mediating this selective suppression was not mapped\", \"single neurotransmitter tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"In vivo tubule microperfusion identified that AVP stimulates distal K⁺ secretion through luminal V1 receptors via PLC/Ca²⁺/PKC activating BK (maxi-K) channels, rather than the canonical V2/cAMP/PKA pathway, establishing a novel effector pathway for AVP in potassium handling.\",\n      \"evidence\": \"In vivo stationary microperfusion of rat cortical distal tubules with K⁺-selective microelectrodes, H89, staurosporine, BAPTA, TEA, and iberiotoxin\",\n      \"pmids\": [\"15253724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"molecular identity of the luminal V1 receptor subtype (V1a vs V1b) was not resolved\", \"contribution to whole-body potassium balance was not quantified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"CaSR activation attenuates AVP-induced AQP2 expression via calmodulin-dependent inhibition of cAMP accumulation, providing a molecular mechanism for hypercalcemia-associated nephrogenic diabetes insipidus.\",\n      \"evidence\": \"mpkCCDcl4 cells with CaSR agonists, CaSR siRNA, calmodulin inhibitor, cAMP and AQP2 protein/mRNA measurements\",\n      \"pmids\": [\"18032798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"specific calmodulin target (e.g. AC isoform or PDE isoform) was not identified\", \"in vivo confirmation in CaSR-deficient animals was not performed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Polycomb complex occupancy at the Avp downstream enhancer was shown to precede and prime early-life stress-responsive DNA methylation changes, establishing the epigenetic sequence (PcG → Tet binding → DNMT recruitment → MeCP2) that programs AVP gene regulation during development.\",\n      \"evidence\": \"ESC-derived hypothalamic-like differentiation model with ChIP for PcG/Tet/MeCP2/DNMT, bisulfite sequencing, and in vivo validation\",\n      \"pmids\": [\"24599304\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"whether this epigenetic sequence is causal for long-term AVP expression changes in vivo after ELS was not conclusively demonstrated\", \"cell model may not fully recapitulate PVN neuron identity\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Oestrogen was shown to suppress salt-dependent hypertension by reversing GABA excitation in magnocellular AVP neurons: DOCA-salt increased NKCC1 and decreased KCC2, shifting the Cl⁻ equilibrium to make GABA depolarizing; oestrogen restored normal Cl⁻ transporter expression and reduced plasma AVP and blood pressure.\",\n      \"evidence\": \"Whole-cell patch-clamp in identified AVP neurons in hypothalamic slices, NKCC1/KCC2 Western blot, plasma AVP RIA, blood pressure measurement, CLP290 rescue in DOCA-salt rats\",\n      \"pmids\": [\"32960965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"oestrogen receptor subtype (ERα vs ERβ) and genomic vs non-genomic action on NKCC1/KCC2 were not dissected\", \"whether this mechanism operates in human salt-sensitive hypertension is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Activation of the apelin receptor was shown to oppose AVP antidiuresis by reducing V2-stimulated cAMP and AQP2 membrane insertion, demonstrating a druggable counter-regulatory axis relevant to hyponatremia correction.\",\n      \"evidence\": \"Collecting duct cell cAMP assay, AQP2 phosphorylation/trafficking by immunofluorescence, in vivo rat model of AVP-induced hyponatremia\",\n      \"pmids\": [\"33436646\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"molecular mechanism by which apelin receptor suppresses V2-coupled adenylate cyclase was not defined\", \"single lab, not yet replicated in clinical hyponatremia\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"AVP was found to suppress macrophage antiviral IFN-I signaling by reducing AHI1, which normally recruits OTUD1 to deubiquitinate and stabilize Tyk2, thereby linking depression-associated AVP elevation to impaired innate immunity.\",\n      \"evidence\": \"Co-IP for AHI1–OTUD1–Tyk2, ubiquitination assays, AHI1 KD/overexpression, AVP treatment of macrophages, validated in MDD patient PBMCs and CUMS mouse model\",\n      \"pmids\": [\"35821088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AVP receptor subtype on macrophages mediating AHI1 downregulation was not identified\", \"whether this pathway contributes to infection susceptibility in depression patients in vivo is unestablished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of AVP precursor folding and its interaction with neurophysin during ER processing, the complete signaling architecture downstream of V1b in β-cells and corticotropes, and whether the AVP–AHI1–Tyk2 immunosuppressive axis is targetable for infection prevention in depression.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"no high-resolution structure of the AVP-neurophysin precursor in the ER folding intermediate state\", \"V1b downstream signaling to insulin exocytosis machinery not mapped\", \"in vivo relevance of AVP-AHI1-Tyk2 axis to clinical infection susceptibility untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 2, 9, 15, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [12, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 2, 9, 11, 15, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0007186\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 9, 15, 17, 21]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [2, 4, 15, 17, 19]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"AVPR1A\",\n      \"AVPR1B\",\n      \"AVPR2\",\n      \"AQP2\",\n      \"AHI1\",\n      \"TYK2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}