{"gene":"OPRK1","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2008,"finding":"An insertion/deletion variant located 1986 bp upstream of the OPRK1 translation start site functions as a regulatory element; the presence of the 830 bp insertion reduces transcriptional activity by approximately half in transient transfection promoter assays, establishing this indel as a functional regulatory variation affecting OPRK1 expression.","method":"Transient transfection promoter assay (luciferase reporter), PCR-based genotyping, family-based association analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional promoter assay with reporter gene demonstrating reduced transcription; single lab with two methods (reporter assay + genotyping), no independent replication","pmids":["18319328"],"is_preprint":false},{"year":2015,"finding":"OPRK1 promoter CpG methylation suppresses OPRK1 gene expression; a CpGs-containing fragment of the OPRK1 promoter significantly increased reporter gene expression in luciferase assays, indicating that hypermethylation of this region reduces OPRK1 transcription.","method":"Bisulfite pyrosequencing for methylation quantification; luciferase reporter assay","journal":"Neuroscience letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, reporter assay only, no mutagenesis or direct mechanistic validation of methylation-mediated silencing","pmids":["26300544"],"is_preprint":false},{"year":2016,"finding":"OPRK1 promoter fragments also drive reporter gene expression in a dual-luciferase assay (replicated in a second study population), and OPRK1 promoter methylation is positively correlated with gender, ethnicity, and aging.","method":"Bisulfite pyrosequencing; dual-luciferase reporter gene assay","journal":"Neuroscience letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, reporter assay without mutagenesis; replicates the promoter activity finding but adds no new mechanistic depth","pmids":["27838450"],"is_preprint":false},{"year":2006,"finding":"KOR (OPRK1 protein) immunoreactivity is present in the majority of OFF and NEUTRAL cells (86% and 80%, respectively) but rarely in ON cells (13%) in the rostral ventromedial medulla (RVM); most KOR-immunoreactive cells co-express GAD67, identifying them as GABAergic neurons, supporting direct KOR-mediated inhibition of these pain-modulating cell types.","method":"Extracellular neuronal recording, juxtacellular labeling with biotinamide, immunofluorescence co-labeling for KOR and GAD67","journal":"Journal of neurophysiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional cell-type classification; single lab but two orthogonal methods (electrophysiology + immunohistochemistry)","pmids":["17005613"],"is_preprint":false},{"year":2012,"finding":"KOR expressed on murine macrophage J774 cells is functionally active: ligation with dynorphin A(1-17) triggers ERK1/2 phosphorylation, whereas the truncated dynorphin A(2-17) (which does not bind KOR) was ineffective, demonstrating KOR-dependent ERK1/2 signaling in immune cells.","method":"FACS, immunocytochemistry, Western blot for phospho-ERK1/2, IFN-γ stimulation, dynorphin ligand pharmacology","journal":"Journal of neuroimmunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional signaling assay with negative control (truncated peptide); single lab with multiple orthogonal methods","pmids":["22424981"],"is_preprint":false},{"year":2011,"finding":"Agonist-activated KOR is phosphorylated at Ser369 in its C-terminal tail by G protein-coupled receptor kinase (GRK), which constitutes the first step in β-arrestin-dependent KOR desensitization; downstream KOR activation increases phosphorylation of both ERK1/2 and p38 MAP kinase, and p38 MAP kinase phosphorylates KIR3.1 (GIRK1) channel.","method":"Phospho-selective antibody immunohistochemistry, validated in behavioral stress models","journal":"Methods in molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-specific antibody validation with behavioral stress paradigms; single lab, mechanistic pathway established with multiple downstream readouts","pmids":["21370032"],"is_preprint":false},{"year":2021,"finding":"Agonist-promoted phosphorylation of mouse KOR at four C-terminal residues (mutated to Ala in K4A knockin mice) plays a sex-dependent role in U50,488H-induced tolerance and conditioned place aversion (CPA): abolishing phosphorylation attenuated tolerance in males but not females, and prevented CPA in females but not males, without affecting acute anti-pruritic or hypo-locomotor effects.","method":"K4A knockin mouse line generation, autoradiography ([3H]U69,593 binding), behavioral assays (scratching, locomotion, CPA, tolerance), Western blot","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — knockin mouse with site-specific phosphorylation mutations, multiple behavioral endpoints, receptor binding autoradiography; rigorous controls, multiple orthogonal methods in a single study","pmids":["34736959"],"is_preprint":false},{"year":1999,"finding":"Antisense oligodeoxynucleotide mapping of KOR-1 (OPRK1) exons revealed that dynorphin B and alpha-neoendorphin analgesia uses a different receptor mechanism than U50,488H analgesia despite all being norBNI-reversible: probes targeting exon 1 or 2 blocked U50,488H but not dynorphin B/alpha-neoendorphin analgesia, indicating multiple kappa analgesic mechanisms dependent on distinct receptor splice variants or conformations.","method":"Antisense oligodeoxynucleotide knockdown of specific KOR-1 exons, in vivo analgesia assay, radioligand binding","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — exon-specific antisense mapping with three exon probes and multiple ligands; single lab","pmids":["10224306"],"is_preprint":false},{"year":2015,"finding":"In striatal membranes from KOR knockout mice, dynorphin peptides (but not U69,593) retain full potency and efficacy in stimulating [35S]GTPγS binding, demonstrating that dynorphin promiscuously activates multiple G proteins beyond KOR in striatum; furthermore, norBNI and 5'GNTI maintain full antagonist potency in KOR-KO mice, revealing that these commonly used 'KOR-selective' antagonists are nonselective in an endogenous tissue context.","method":"[35S]GTPγS binding assay in striatal membrane preparations from WT, KOR-KO, and MOR-KO mice","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro receptor pharmacology with genetic knockout controls; rigorous negative result establishing limits of ligand selectivity","pmids":["26160155"],"is_preprint":false},{"year":2022,"finding":"Conditional knockout of adenylyl cyclase 3 (AC3) in DRG neurons eliminated KOR agonist-induced analgesia and KOR-mediated inhibition of voltage-gated potassium (Kv) channels, demonstrating that peripheral AC3 is required for KOR opioid analgesia through either classical Gαi/o signaling or direct KOR–AC3 protein interaction.","method":"Conditional KO of AC3 in L3/L4 DRGs, patch-clamp electrophysiology (Kv currents), behavioral nociception assays, Western blot, cAMP measurement, pharmacological rescue with AC1 inhibitor","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — conditional KO with multiple orthogonal methods (electrophysiology, biochemistry, behavior); mechanistic rescue experiments; single lab but rigorous multi-method study","pmids":["34914639"],"is_preprint":false},{"year":2022,"finding":"The crystal structure of human KOR in complex with the antagonist JDTic (solved in 2012) and a subsequently determined active-state KOR structure provided atomistic insight into subtype selectivity and activation mechanisms; structure-based virtual screening from these structures has enabled discovery of new KOR-selective ligands.","method":"X-ray crystallography (KOR-JDTic complex); structure-based virtual screening","journal":"Handbook of experimental pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystallographic structure with orthogonal functional validation (cited as revolutionizing understanding of opioid pharmacology); independently replicated across multiple labs","pmids":["33945028"],"is_preprint":false},{"year":2020,"finding":"Blockade of KOR in the ventral tegmental area (VTA) attenuated aversion-induced reductions in dopamine in the nucleus accumbens and prevented learned avoidance behavior, demonstrating that VTA KOR activation is necessary for aversion-induced dopamine suppression and the encoding of avoidance.","method":"Intra-VTA KOR antagonist microinjection, real-time voltammetric dopamine measurement, behavioral avoidance testing in rats","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific pharmacological manipulation with real-time neurochemical readout; single lab, two orthogonal methods","pmids":["32057802"],"is_preprint":false},{"year":2023,"finding":"Overexpression of Oprk1 in VTA dopaminergic neurons (TH::Cre rats) recapitulated phenotypes of alcohol dependence including escalated alcohol self-administration and depressive-like behavior, establishing that KOR signaling within the mesolimbic dopamine system causally contributes to these alcohol dependence phenotypes.","method":"Cre-Lox conditional Oprk1 overexpression in VTA DA neurons (TH::Cre rats), operant alcohol self-administration, sucrose preference, behavioral assays","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific genetic manipulation with defined behavioral phenotype; single lab","pmids":["36764577"],"is_preprint":false},{"year":2022,"finding":"Conditional deletion of KOR specifically from kisspeptin neurons (KNDy neurons) did not alter LH pulse parameters, puberty, estrous cycles, FSH levels, LH surges, or fertility in male or female mice, demonstrating that KOR signaling within kisspeptin neurons is not strictly required for normal GnRH/LH pulse generation.","method":"Conditional Oprk1 knockout in kisspeptin neurons (Kiss1-Cre × Oprk1flox/flox), in vivo LH pulse monitoring, hormonal measurements, fertility assessments","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional KO with comprehensive reproductive phenotyping; negative result well-controlled; single lab","pmids":["36260530"],"is_preprint":false},{"year":2023,"finding":"OPRK1 is transcriptionally repressed by androgen receptor (AR) binding to its promoter; AR pathway inhibitors (ARPIs) de-repress OPRK1, leading to upregulation of OPRK1 protein. Elevated OPRK1 then interacts with SLC9A3R1, promoting autophagic degradation of the transcriptional repressor REST and thereby inducing neuroendocrine differentiation in prostate cancer.","method":"AR ChIP at OPRK1 promoter, co-immunoprecipitation (OPRK1–SLC9A3R1), autophagy flux assays, REST protein levels by Western blot, neuroendocrine marker expression, pharmacological rescue (JTC-801 + chloroquine)","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, Co-IP, autophagy assays, rescue pharmacology); single lab, mechanistic pathway established","pmids":["41353213"],"is_preprint":false},{"year":2023,"finding":"Activation of KOR in the insular cortex blocked pain-related aversive memory behaviors, whereas KOR inhibition induced such behaviors; chemogenetic activation of GABAergic neurons reversed the effect of KOR activation, placing KOR upstream of (and inhibitory to) insular GABAergic neuron activity in the circuit controlling pain-related aversive memory.","method":"Pharmacological KOR agonism/antagonism in insular cortex, DREADD chemogenetics of GABAergic neurons, behavioral fear/aversive memory assays","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemogenetic and pharmacological epistasis with behavioral readout; single lab, two orthogonal manipulation methods","pmids":["37679857"],"is_preprint":false},{"year":2022,"finding":"Nalfurafine (KOR agonist) produces diuresis and antinatriuresis; this diuretic effect is mediated through central KOR pathways (blocked by ICV but not IV norBNI pretreatment), while the electrolyte-retaining effects occur via peripheral KOR pathways, dissociating central and peripheral mechanisms of KOR-mediated renal function.","method":"ICV vs IV norBNI pretreatment in conscious catheterized rats, urine output and electrolyte measurements","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of central vs peripheral KOR pathways using route-specific antagonist delivery; single lab, clean mechanistic separation","pmids":["36202183"],"is_preprint":false},{"year":2023,"finding":"KOR activation in ER-positive breast cancer cells (MCF-7, T47D) inhibited cellular proliferation and promoted apoptosis; downstream pathway analysis and XBP1 silencing experiments established that the anti-tumor effect operates through a KOR-ER-XBP1 signaling axis.","method":"KOR agonist treatment of ER+ breast cancer cell lines, proliferation and apoptosis assays, siRNA knockdown of XBP1, GO/KEGG pathway analysis, PPI network analysis","journal":"Biomedicine & pharmacotherapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — cell-based assays with siRNA knockdown; pathway placement relies partly on bioinformatic analysis; single lab","pmids":["37708692"],"is_preprint":false},{"year":2022,"finding":"Famotidine was identified as a drug that directly binds KOR (by structure-based virtual screening and binding validation) and promotes oligodendrocyte precursor cell (OPC) maturation and CNS remyelination through KOR/STAT3 signaling pathway.","method":"Structure-based virtual screening, in vitro OPC differentiation assays, in vivo remyelination model, STAT3 pathway analysis","journal":"International journal of biological macromolecules","confidence":"Low","confidence_rationale":"Tier 3 / Weak — computational docking followed by cell and animal assays; limited mechanistic validation of direct KOR-famotidine binding; single lab","pmids":["38692525"],"is_preprint":false},{"year":2024,"finding":"Chemogenetic activation of KOR-expressing neurons in the basolateral amygdala (BLAKORs) and their projections to the BNST attenuated social stress-escalated alcohol consumption in both male and female mice, identifying the BLAKOR→BNST circuit as a specific pathway through which the dynorphin/KOR system regulates stress-induced alcohol drinking.","method":"DREADD chemogenetics in Oprk1-Cre mice (BLA-specific), systemic and BNST-specific KOR antagonism (norBNI), two-bottle choice alcohol consumption after repeated social defeat stress","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2 / Weak — circuit-specific chemogenetics with behavioral readout; preprint, not peer-reviewed; single lab","pmids":["39574601"],"is_preprint":true},{"year":2015,"finding":"A KOR-Cre knockin mouse was generated in which Cre recombinase replaces the initial coding sequence of Oprk1; the allele mediates recombination by E14.5 and is expressed in cerebral cortex, nucleus accumbens, striatum, heart, lung, liver, and retinal bipolar/amacrine cells, providing a genetic map of KOR-expressing cell populations.","method":"Knockin mouse generation, Cre-reporter recombination assays, histological characterization across tissues and brain regions","journal":"Genesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genetic tool with validated recombination; characterizes endogenous OPRK1 expression pattern at cellular resolution; single lab","pmids":["26575788"],"is_preprint":false}],"current_model":"OPRK1 encodes the kappa opioid receptor (KOR), a GPCR that is activated by dynorphin peptides and signals through Gαi/o to inhibit adenylyl cyclase (requiring peripheral AC3 for analgesic signaling), suppress dopamine release in mesolimbic circuits via VTA KOR activation, and phosphorylate downstream kinases (ERK1/2, p38 MAPK); agonist-occupied KOR is phosphorylated at Ser369 in its C-terminal tail by GRK, initiating β-arrestin-dependent desensitization in a sex-dependent manner that governs tolerance and conditioned aversion; OPRK1 transcription is repressed by androgen receptor binding to its promoter and is regulated by promoter methylation and an upstream indel that reduces transcriptional activity; the receptor localizes to GABAergic OFF and NEUTRAL neurons in the RVM, to dopaminergic VTA neurons whose KOR overexpression recapitulates alcohol dependence phenotypes, and to a BLA→BNST circuit regulating stress-induced alcohol consumption; crystallographic structures of KOR in inactive and active states have defined ligand-binding determinants and activation mechanisms; in neuroendocrine prostate cancer, OPRK1 interacts with SLC9A3R1 to promote autophagic REST degradation downstream of AR de-repression."},"narrative":{"mechanistic_narrative":"OPRK1 encodes the kappa opioid receptor (KOR), a Gαi/o-coupled GPCR activated by dynorphin peptides that operates across pain modulation, aversion/reward circuits, and stress-driven behavior [PMID:17005613, PMID:32057802]. Agonist occupancy drives phosphorylation at the C-terminal tail by GRK as the initiating step of β-arrestin-dependent desensitization, and downstream KOR activation increases ERK1/2 and p38 MAPK phosphorylation, with p38 in turn phosphorylating the KIR3.1 (GIRK1) channel [PMID:21370032]; KOR-dependent ERK1/2 signaling is also functional in immune cells [PMID:22424981]. Site-specific knockin of four C-terminal phospho-sites establishes that this phosphorylation governs U50,488H tolerance and conditioned place aversion in a sex-dependent manner, attenuating tolerance in males and preventing aversion in females [PMID:34736959]. Peripheral analgesic signaling requires adenylyl cyclase 3 in DRG neurons, where KOR inhibits voltage-gated potassium channels [PMID:34914639]. In neural circuits, KOR is expressed on GABAergic OFF/NEUTRAL cells of the rostral ventromedial medulla [PMID:17005613], on insular GABAergic neurons where it gates pain-related aversive memory [PMID:37679857], and within the mesolimbic system, where VTA KOR activation is necessary for aversion-induced dopamine suppression and avoidance learning [PMID:32057802] and KOR overexpression in VTA dopaminergic neurons recapitulates alcohol dependence phenotypes [PMID:36764577]. Crystallographic structures of inactive (JDTic-bound) and active KOR have defined ligand-binding determinants and enabled structure-based ligand discovery [PMID:33945028]. Beyond neural function, OPRK1 is transcriptionally repressed by androgen receptor binding at its promoter, and upon AR-inhibitor-driven de-repression interacts with SLC9A3R1 to promote autophagic degradation of REST and neuroendocrine differentiation in prostate cancer [PMID:41353213]; its expression is also modulated by an upstream regulatory indel and by promoter CpG methylation [PMID:18319328, PMID:26300544].","teleology":[{"year":1999,"claim":"Established that distinct kappa agonists engage non-equivalent receptor mechanisms, raising the question of how a single locus produces multiple analgesic pathways.","evidence":"Exon-specific antisense oligodeoxynucleotide knockdown of KOR-1 with multiple ligands in an in vivo analgesia assay","pmids":["10224306"],"confidence":"Medium","gaps":["Splice variants/conformations not molecularly defined","Single lab, antisense specificity not genetically confirmed"]},{"year":2006,"claim":"Resolved which RVM cell types carry KOR, showing KOR marks GABAergic OFF/NEUTRAL pain-modulating neurons rather than ON cells.","evidence":"Electrophysiological cell classification with juxtacellular labeling and KOR/GAD67 immunofluorescence co-labeling","pmids":["17005613"],"confidence":"Medium","gaps":["Functional consequence of KOR activation on these cells not directly tested here","Circuit output not measured"]},{"year":2008,"claim":"Identified a functional cis-regulatory determinant of OPRK1 expression, addressing how receptor levels are set.","evidence":"Luciferase promoter assay of an upstream indel plus family-based genotyping","pmids":["18319328"],"confidence":"Medium","gaps":["Endogenous chromatin effect not shown","Transcription factors binding the indel not identified"]},{"year":2011,"claim":"Defined the KOR desensitization initiation step and downstream kinase cascade, linking C-terminal phosphorylation to β-arrestin recruitment and effector channel modulation.","evidence":"Phospho-selective antibody immunohistochemistry at Ser369 with behavioral stress validation; readouts of ERK1/2, p38, and KIR3.1 phosphorylation","pmids":["21370032"],"confidence":"Medium","gaps":["β-arrestin recruitment not directly measured here","Stoichiometry of multi-site phosphorylation unresolved"]},{"year":2012,"claim":"Demonstrated KOR is a functional signaling receptor on immune cells, extending its role beyond neurons.","evidence":"Dynorphin A(1-17) vs inactive A(2-17) stimulation of phospho-ERK1/2 in J774 macrophages by Western blot","pmids":["22424981"],"confidence":"Medium","gaps":["Physiological immune consequence not established","G protein coupling in this context not dissected"]},{"year":2015,"claim":"Established the limits of dynorphin and 'KOR-selective' ligand specificity using genetic knockouts, a critical caveat for interpreting KOR pharmacology.","evidence":"[35S]GTPγS binding in striatal membranes from WT, KOR-KO, and MOR-KO mice","pmids":["26160155"],"confidence":"High","gaps":["Identity of the additional dynorphin-coupled G proteins not defined","Restricted to striatal tissue"]},{"year":2015,"claim":"Mapped endogenous KOR-expressing cell populations across brain and peripheral tissues, providing a genetic substrate for circuit dissection.","evidence":"KOR-Cre knockin mouse with reporter recombination and histology","pmids":["26575788"],"confidence":"Medium","gaps":["Cre knockin disrupts coding sequence (potential haploinsufficiency)","Expression timing/level not quantified per cell"]},{"year":2016,"claim":"Linked OPRK1 promoter methylation to expression and to demographic variables, addressing epigenetic regulation of the receptor.","evidence":"Bisulfite pyrosequencing and dual-luciferase reporter assays in two populations","pmids":["26300544","27838450"],"confidence":"Low","gaps":["No mutagenesis confirming methylation-mediated silencing mechanism","Reporter assays without endogenous validation"]},{"year":2020,"claim":"Established that VTA KOR activation is necessary for aversion-induced dopamine suppression and avoidance learning, placing KOR causally in mesolimbic aversion encoding.","evidence":"Intra-VTA KOR antagonist microinjection with real-time voltammetric dopamine measurement and behavioral avoidance testing in rats","pmids":["32057802"],"confidence":"Medium","gaps":["Pre/postsynaptic site of KOR action within VTA not resolved","Single lab"]},{"year":2021,"claim":"Proved C-terminal phosphorylation governs tolerance and aversion in a sex-dependent manner, dissociating these from acute receptor effects.","evidence":"K4A phosphorylation-deficient knockin mice with behavioral assays and receptor binding autoradiography","pmids":["34736959"],"confidence":"High","gaps":["Molecular basis of sex dependence unknown","Specific arrestin/kinase mediating each behavior not assigned"]},{"year":2022,"claim":"Identified peripheral AC3 as required for KOR analgesia and Kv-channel inhibition, refining the effector requirements of KOR signaling.","evidence":"Conditional AC3 KO in DRG with patch-clamp, cAMP, behavior, and AC1-inhibitor rescue","pmids":["34914639"],"confidence":"High","gaps":["Whether AC3 acts via classical Gαi/o or direct KOR–AC3 interaction not distinguished","Central analgesic mechanisms not addressed"]},{"year":2022,"claim":"Dissociated central diuretic from peripheral electrolyte-retaining KOR effects on renal function.","evidence":"Route-specific (ICV vs IV) norBNI pretreatment with urine/electrolyte measurement in rats","pmids":["36202183"],"confidence":"Medium","gaps":["Specific central and peripheral KOR sites not identified","Downstream renal signaling unknown"]},{"year":2022,"claim":"Showed KOR within kisspeptin neurons is dispensable for GnRH/LH pulse generation and fertility, a well-controlled negative result for KOR's reproductive role.","evidence":"Conditional Oprk1 KO in kisspeptin neurons with LH pulse monitoring, hormone assays, and fertility assessment","pmids":["36260530"],"confidence":"Medium","gaps":["KOR action on other hypothalamic populations not excluded","Compensation by other opioid receptors not tested"]},{"year":2022,"claim":"Consolidated structural understanding of KOR activation and selectivity, enabling rational ligand discovery.","evidence":"X-ray crystallography of KOR-JDTic and active-state structures with structure-based virtual screening","pmids":["33945028"],"confidence":"High","gaps":["G protein/arrestin-coupled state-specific dynamics not fully captured here","Biased-signaling structural determinants not resolved"]},{"year":2023,"claim":"Identified the BLA(KOR)→BNST circuit through which the dynorphin/KOR system regulates stress-escalated alcohol consumption.","evidence":"DREADD chemogenetics in Oprk1-Cre mice with circuit-specific norBNI and two-bottle choice after social defeat (preprint)","pmids":["39574601"],"confidence":"Low","gaps":["Preprint, not peer-reviewed","Endogenous dynorphin source onto this circuit not defined"]},{"year":2023,"claim":"Established VTA dopaminergic KOR overexpression as causally sufficient to produce alcohol dependence phenotypes, and placed KOR upstream of insular GABAergic control of pain-aversive memory.","evidence":"Cre-Lox Oprk1 overexpression in VTA DA neurons with alcohol self-administration; pharmacological KOR manipulation plus GABAergic DREADDs in insular cortex","pmids":["36764577","37679857"],"confidence":"Medium","gaps":["Overexpression may exceed physiological KOR levels","Synaptic mechanism of KOR-GABAergic inhibition not detailed"]},{"year":2023,"claim":"Defined a non-neural OPRK1 axis in cancer: AR represses OPRK1, and de-repressed OPRK1 drives REST autophagic degradation via SLC9A3R1 to induce neuroendocrine differentiation.","evidence":"AR ChIP at OPRK1 promoter, OPRK1–SLC9A3R1 co-IP, autophagy flux, REST Western blot, and pharmacological rescue in prostate cancer","pmids":["41353213"],"confidence":"Medium","gaps":["Direct GPCR signaling contribution vs scaffold role of OPRK1 not separated","Single lab, reciprocal co-IP validation not detailed"]},{"year":null,"claim":"It remains unresolved how KOR distinguishes among its diverse ligand-, circuit-, and tissue-specific outputs at the molecular level, including the structural basis of biased signaling and the determinants of sex-dependent behavioral effects.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of biased agonism linked to behavior","Molecular basis of sex-dependent phosphorylation effects unknown","G protein/effector selectivity across tissues not unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,11,9]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[4,8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,9,11]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,11,15]}],"complexes":[],"partners":["SLC9A3R1","AC3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P41145","full_name":"Kappa-type opioid receptor","aliases":[],"length_aa":380,"mass_kda":42.6,"function":"G-protein coupled opioid receptor that functions as a receptor for endogenous alpha-neoendorphins and dynorphins, but has low affinity for beta-endorphins. Also functions as a receptor for various synthetic opioids and for the psychoactive diterpene salvinorin A. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors, such as adenylate cyclase. Signaling leads to the inhibition of adenylate cyclase activity. Inhibits neurotransmitter release by reducing calcium ion currents and increasing potassium ion conductance. Plays a role in the perception of pain. Plays a role in mediating reduced physical activity upon treatment with synthetic opioids. Plays a role in the regulation of salivation in response to synthetic opioids. 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Oxfordshire)","url":"https://pubmed.ncbi.nlm.nih.gov/37177778","citation_count":5,"is_preprint":false},{"pmid":"37455648","id":"PMC_37455648","title":"The role of miRNA-144-3p/Oprk1/KOR in nicotine dependence and nicotine withdrawal in male rats.","date":"2023","source":"Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco","url":"https://pubmed.ncbi.nlm.nih.gov/37455648","citation_count":4,"is_preprint":false},{"pmid":"30365572","id":"PMC_30365572","title":"Genetic Variations of OPRM1, OPRK1, and COMT Genes and Their Possible Associations with Oral Pain in a Population from Argentina.","date":"2018","source":"Journal of oral & facial pain and headache","url":"https://pubmed.ncbi.nlm.nih.gov/30365572","citation_count":4,"is_preprint":false},{"pmid":"38862675","id":"PMC_38862675","title":"Differential methylation of OPRK1 in borderline personality disorder is associated with childhood trauma.","date":"2024","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/38862675","citation_count":4,"is_preprint":false},{"pmid":"31556948","id":"PMC_31556948","title":"Effects of the Alpha-1 Antagonist Prazosin on KOR Agonist-Induced Reinstatement of Alcohol Seeking.","date":"2019","source":"The international journal of neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/31556948","citation_count":4,"is_preprint":false},{"pmid":"21069260","id":"PMC_21069260","title":"Evaluation of the effect of flavangenol on serum lipid peroxide levels and development of atherosclerosis in spontaneously hyperlipidemic B6.KOR-Apoeshl mice.","date":"2010","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/21069260","citation_count":4,"is_preprint":false},{"pmid":"40588011","id":"PMC_40588011","title":"KOR agonists for the treatment and/or prevention of opioid use disorder and cocaine use disorder.","date":"2025","source":"Pharmacology, biochemistry, and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/40588011","citation_count":3,"is_preprint":false},{"pmid":"38692525","id":"PMC_38692525","title":"Targeting of KOR by famotidine promotes OPC maturation differentiation and CNS remyelination via STAT3 signaling pathway.","date":"2024","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/38692525","citation_count":3,"is_preprint":false},{"pmid":"27843991","id":"PMC_27843991","title":"Karyological and molecular analysis of three endemic loaches (Actinopterygii: Cobitoidea) from Kor River basin, Iran.","date":"2015","source":"Molecular biology research communications","url":"https://pubmed.ncbi.nlm.nih.gov/27843991","citation_count":3,"is_preprint":false},{"pmid":"37166316","id":"PMC_37166316","title":"Association of OPRK1 rs963549 and rs997917 polymorphisms with opioid use disorder and related phenotypes.","date":"2023","source":"Pharmacogenomics","url":"https://pubmed.ncbi.nlm.nih.gov/37166316","citation_count":2,"is_preprint":false},{"pmid":"33945028","id":"PMC_33945028","title":"Structural Characterization of KOR Inactive and Active States for 3D Pharmacology and Drug Discovery.","date":"2022","source":"Handbook of experimental pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/33945028","citation_count":2,"is_preprint":false},{"pmid":"40633208","id":"PMC_40633208","title":"U50 488H KOR agonist reduces cartilage degradation, chondrocyte hypertrophy and bone loss in osteoarthritis.","date":"2025","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40633208","citation_count":2,"is_preprint":false},{"pmid":"37396111","id":"PMC_37396111","title":"Comprehensive behavioral study of C57BL/6.KOR-ApoEshl mice.","date":"2023","source":"Translational neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/37396111","citation_count":2,"is_preprint":false},{"pmid":"38986343","id":"PMC_38986343","title":"Discovery of N'-benzyl-3-chloro-N-((1S,3R,4R)-3-((dimethylamino)methyl)-4-hydroxy-4-(3-methoxyphenyl)cyclohexyl)benzenesulfonamide as a novel selective KOR ligand.","date":"2024","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38986343","citation_count":2,"is_preprint":false},{"pmid":"40360690","id":"PMC_40360690","title":"Selective KOR antagonist alters functional patch sizes in individualized brain system: results from the Fast-fail Trial in Mood and Anxiety Spectrum Disorders (FAST-MAS).","date":"2025","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40360690","citation_count":2,"is_preprint":false},{"pmid":"40068406","id":"PMC_40068406","title":"Structure-activity relationship analysis of meta-substituted N-cyclopropylmethyl-nornepenthones with mixed KOR/MOR activities.","date":"2025","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/40068406","citation_count":2,"is_preprint":false},{"pmid":"36695971","id":"PMC_36695971","title":"Clustering of KOR PET images separates people with AUD into distinct responses to naltrexone.","date":"2023","source":"Brain imaging and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/36695971","citation_count":2,"is_preprint":false},{"pmid":"34731743","id":"PMC_34731743","title":"Estimation of ZYKR1 in human urine and plasma utilizing LC-MS/MS positive electrospray ionization; a kappa opioid receptor (KOR) agonist.","date":"2021","source":"Journal of chromatography. B, Analytical technologies in the biomedical and life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34731743","citation_count":2,"is_preprint":false},{"pmid":"22771010","id":"PMC_22771010","title":"An efficient synthesis of 3-OBn-6β,14-epoxy-bridged opiates from naltrexone and identification of a related dual MOR inverse agonist/KOR agonist.","date":"2012","source":"Bioorganic & medicinal chemistry letters","url":"https://pubmed.ncbi.nlm.nih.gov/22771010","citation_count":2,"is_preprint":false},{"pmid":"41353213","id":"PMC_41353213","title":"OPRK1 drives SLC9A3R1 progression to neuroendocrine prostate cancer.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41353213","citation_count":1,"is_preprint":false},{"pmid":"38893511","id":"PMC_38893511","title":"Decoding the κ Opioid Receptor (KOR): Advancements in Structural Understanding and Implications for Opioid Analgesic Development.","date":"2024","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/38893511","citation_count":1,"is_preprint":false},{"pmid":"40567495","id":"PMC_40567495","title":"The efficacy and safety of kappa opioid receptor (KOR) agonists in patients with uraemic pruritus: a systematic review and network meta-analysis.","date":"2025","source":"Clinical kidney journal","url":"https://pubmed.ncbi.nlm.nih.gov/40567495","citation_count":1,"is_preprint":false},{"pmid":"38147391","id":"PMC_38147391","title":"[Polymorphisms of OPRM1, OPRK1, DCC genes and non-suicidal self-injuries in adults].","date":"2023","source":"Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova","url":"https://pubmed.ncbi.nlm.nih.gov/38147391","citation_count":1,"is_preprint":false},{"pmid":"39574601","id":"PMC_39574601","title":"BLAKOR inputs to the BNST regulate social stress-escalated alcohol consumption.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39574601","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51916,"output_tokens":5302,"usd":0.117639,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13888,"output_tokens":4714,"usd":0.093645,"stage2_stop_reason":"end_turn"},"total_usd":0.211284,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"An insertion/deletion variant located 1986 bp upstream of the OPRK1 translation start site functions as a regulatory element; the presence of the 830 bp insertion reduces transcriptional activity by approximately half in transient transfection promoter assays, establishing this indel as a functional regulatory variation affecting OPRK1 expression.\",\n      \"method\": \"Transient transfection promoter assay (luciferase reporter), PCR-based genotyping, family-based association analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional promoter assay with reporter gene demonstrating reduced transcription; single lab with two methods (reporter assay + genotyping), no independent replication\",\n      \"pmids\": [\"18319328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"OPRK1 promoter CpG methylation suppresses OPRK1 gene expression; a CpGs-containing fragment of the OPRK1 promoter significantly increased reporter gene expression in luciferase assays, indicating that hypermethylation of this region reduces OPRK1 transcription.\",\n      \"method\": \"Bisulfite pyrosequencing for methylation quantification; luciferase reporter assay\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, reporter assay only, no mutagenesis or direct mechanistic validation of methylation-mediated silencing\",\n      \"pmids\": [\"26300544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"OPRK1 promoter fragments also drive reporter gene expression in a dual-luciferase assay (replicated in a second study population), and OPRK1 promoter methylation is positively correlated with gender, ethnicity, and aging.\",\n      \"method\": \"Bisulfite pyrosequencing; dual-luciferase reporter gene assay\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, reporter assay without mutagenesis; replicates the promoter activity finding but adds no new mechanistic depth\",\n      \"pmids\": [\"27838450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"KOR (OPRK1 protein) immunoreactivity is present in the majority of OFF and NEUTRAL cells (86% and 80%, respectively) but rarely in ON cells (13%) in the rostral ventromedial medulla (RVM); most KOR-immunoreactive cells co-express GAD67, identifying them as GABAergic neurons, supporting direct KOR-mediated inhibition of these pain-modulating cell types.\",\n      \"method\": \"Extracellular neuronal recording, juxtacellular labeling with biotinamide, immunofluorescence co-labeling for KOR and GAD67\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional cell-type classification; single lab but two orthogonal methods (electrophysiology + immunohistochemistry)\",\n      \"pmids\": [\"17005613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KOR expressed on murine macrophage J774 cells is functionally active: ligation with dynorphin A(1-17) triggers ERK1/2 phosphorylation, whereas the truncated dynorphin A(2-17) (which does not bind KOR) was ineffective, demonstrating KOR-dependent ERK1/2 signaling in immune cells.\",\n      \"method\": \"FACS, immunocytochemistry, Western blot for phospho-ERK1/2, IFN-γ stimulation, dynorphin ligand pharmacology\",\n      \"journal\": \"Journal of neuroimmunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional signaling assay with negative control (truncated peptide); single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22424981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Agonist-activated KOR is phosphorylated at Ser369 in its C-terminal tail by G protein-coupled receptor kinase (GRK), which constitutes the first step in β-arrestin-dependent KOR desensitization; downstream KOR activation increases phosphorylation of both ERK1/2 and p38 MAP kinase, and p38 MAP kinase phosphorylates KIR3.1 (GIRK1) channel.\",\n      \"method\": \"Phospho-selective antibody immunohistochemistry, validated in behavioral stress models\",\n      \"journal\": \"Methods in molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-specific antibody validation with behavioral stress paradigms; single lab, mechanistic pathway established with multiple downstream readouts\",\n      \"pmids\": [\"21370032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Agonist-promoted phosphorylation of mouse KOR at four C-terminal residues (mutated to Ala in K4A knockin mice) plays a sex-dependent role in U50,488H-induced tolerance and conditioned place aversion (CPA): abolishing phosphorylation attenuated tolerance in males but not females, and prevented CPA in females but not males, without affecting acute anti-pruritic or hypo-locomotor effects.\",\n      \"method\": \"K4A knockin mouse line generation, autoradiography ([3H]U69,593 binding), behavioral assays (scratching, locomotion, CPA, tolerance), Western blot\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — knockin mouse with site-specific phosphorylation mutations, multiple behavioral endpoints, receptor binding autoradiography; rigorous controls, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"34736959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Antisense oligodeoxynucleotide mapping of KOR-1 (OPRK1) exons revealed that dynorphin B and alpha-neoendorphin analgesia uses a different receptor mechanism than U50,488H analgesia despite all being norBNI-reversible: probes targeting exon 1 or 2 blocked U50,488H but not dynorphin B/alpha-neoendorphin analgesia, indicating multiple kappa analgesic mechanisms dependent on distinct receptor splice variants or conformations.\",\n      \"method\": \"Antisense oligodeoxynucleotide knockdown of specific KOR-1 exons, in vivo analgesia assay, radioligand binding\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — exon-specific antisense mapping with three exon probes and multiple ligands; single lab\",\n      \"pmids\": [\"10224306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In striatal membranes from KOR knockout mice, dynorphin peptides (but not U69,593) retain full potency and efficacy in stimulating [35S]GTPγS binding, demonstrating that dynorphin promiscuously activates multiple G proteins beyond KOR in striatum; furthermore, norBNI and 5'GNTI maintain full antagonist potency in KOR-KO mice, revealing that these commonly used 'KOR-selective' antagonists are nonselective in an endogenous tissue context.\",\n      \"method\": \"[35S]GTPγS binding assay in striatal membrane preparations from WT, KOR-KO, and MOR-KO mice\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro receptor pharmacology with genetic knockout controls; rigorous negative result establishing limits of ligand selectivity\",\n      \"pmids\": [\"26160155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional knockout of adenylyl cyclase 3 (AC3) in DRG neurons eliminated KOR agonist-induced analgesia and KOR-mediated inhibition of voltage-gated potassium (Kv) channels, demonstrating that peripheral AC3 is required for KOR opioid analgesia through either classical Gαi/o signaling or direct KOR–AC3 protein interaction.\",\n      \"method\": \"Conditional KO of AC3 in L3/L4 DRGs, patch-clamp electrophysiology (Kv currents), behavioral nociception assays, Western blot, cAMP measurement, pharmacological rescue with AC1 inhibitor\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — conditional KO with multiple orthogonal methods (electrophysiology, biochemistry, behavior); mechanistic rescue experiments; single lab but rigorous multi-method study\",\n      \"pmids\": [\"34914639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The crystal structure of human KOR in complex with the antagonist JDTic (solved in 2012) and a subsequently determined active-state KOR structure provided atomistic insight into subtype selectivity and activation mechanisms; structure-based virtual screening from these structures has enabled discovery of new KOR-selective ligands.\",\n      \"method\": \"X-ray crystallography (KOR-JDTic complex); structure-based virtual screening\",\n      \"journal\": \"Handbook of experimental pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystallographic structure with orthogonal functional validation (cited as revolutionizing understanding of opioid pharmacology); independently replicated across multiple labs\",\n      \"pmids\": [\"33945028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Blockade of KOR in the ventral tegmental area (VTA) attenuated aversion-induced reductions in dopamine in the nucleus accumbens and prevented learned avoidance behavior, demonstrating that VTA KOR activation is necessary for aversion-induced dopamine suppression and the encoding of avoidance.\",\n      \"method\": \"Intra-VTA KOR antagonist microinjection, real-time voltammetric dopamine measurement, behavioral avoidance testing in rats\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific pharmacological manipulation with real-time neurochemical readout; single lab, two orthogonal methods\",\n      \"pmids\": [\"32057802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Overexpression of Oprk1 in VTA dopaminergic neurons (TH::Cre rats) recapitulated phenotypes of alcohol dependence including escalated alcohol self-administration and depressive-like behavior, establishing that KOR signaling within the mesolimbic dopamine system causally contributes to these alcohol dependence phenotypes.\",\n      \"method\": \"Cre-Lox conditional Oprk1 overexpression in VTA DA neurons (TH::Cre rats), operant alcohol self-administration, sucrose preference, behavioral assays\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific genetic manipulation with defined behavioral phenotype; single lab\",\n      \"pmids\": [\"36764577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional deletion of KOR specifically from kisspeptin neurons (KNDy neurons) did not alter LH pulse parameters, puberty, estrous cycles, FSH levels, LH surges, or fertility in male or female mice, demonstrating that KOR signaling within kisspeptin neurons is not strictly required for normal GnRH/LH pulse generation.\",\n      \"method\": \"Conditional Oprk1 knockout in kisspeptin neurons (Kiss1-Cre × Oprk1flox/flox), in vivo LH pulse monitoring, hormonal measurements, fertility assessments\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional KO with comprehensive reproductive phenotyping; negative result well-controlled; single lab\",\n      \"pmids\": [\"36260530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"OPRK1 is transcriptionally repressed by androgen receptor (AR) binding to its promoter; AR pathway inhibitors (ARPIs) de-repress OPRK1, leading to upregulation of OPRK1 protein. Elevated OPRK1 then interacts with SLC9A3R1, promoting autophagic degradation of the transcriptional repressor REST and thereby inducing neuroendocrine differentiation in prostate cancer.\",\n      \"method\": \"AR ChIP at OPRK1 promoter, co-immunoprecipitation (OPRK1–SLC9A3R1), autophagy flux assays, REST protein levels by Western blot, neuroendocrine marker expression, pharmacological rescue (JTC-801 + chloroquine)\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, Co-IP, autophagy assays, rescue pharmacology); single lab, mechanistic pathway established\",\n      \"pmids\": [\"41353213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Activation of KOR in the insular cortex blocked pain-related aversive memory behaviors, whereas KOR inhibition induced such behaviors; chemogenetic activation of GABAergic neurons reversed the effect of KOR activation, placing KOR upstream of (and inhibitory to) insular GABAergic neuron activity in the circuit controlling pain-related aversive memory.\",\n      \"method\": \"Pharmacological KOR agonism/antagonism in insular cortex, DREADD chemogenetics of GABAergic neurons, behavioral fear/aversive memory assays\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemogenetic and pharmacological epistasis with behavioral readout; single lab, two orthogonal manipulation methods\",\n      \"pmids\": [\"37679857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nalfurafine (KOR agonist) produces diuresis and antinatriuresis; this diuretic effect is mediated through central KOR pathways (blocked by ICV but not IV norBNI pretreatment), while the electrolyte-retaining effects occur via peripheral KOR pathways, dissociating central and peripheral mechanisms of KOR-mediated renal function.\",\n      \"method\": \"ICV vs IV norBNI pretreatment in conscious catheterized rats, urine output and electrolyte measurements\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of central vs peripheral KOR pathways using route-specific antagonist delivery; single lab, clean mechanistic separation\",\n      \"pmids\": [\"36202183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KOR activation in ER-positive breast cancer cells (MCF-7, T47D) inhibited cellular proliferation and promoted apoptosis; downstream pathway analysis and XBP1 silencing experiments established that the anti-tumor effect operates through a KOR-ER-XBP1 signaling axis.\",\n      \"method\": \"KOR agonist treatment of ER+ breast cancer cell lines, proliferation and apoptosis assays, siRNA knockdown of XBP1, GO/KEGG pathway analysis, PPI network analysis\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — cell-based assays with siRNA knockdown; pathway placement relies partly on bioinformatic analysis; single lab\",\n      \"pmids\": [\"37708692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Famotidine was identified as a drug that directly binds KOR (by structure-based virtual screening and binding validation) and promotes oligodendrocyte precursor cell (OPC) maturation and CNS remyelination through KOR/STAT3 signaling pathway.\",\n      \"method\": \"Structure-based virtual screening, in vitro OPC differentiation assays, in vivo remyelination model, STAT3 pathway analysis\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — computational docking followed by cell and animal assays; limited mechanistic validation of direct KOR-famotidine binding; single lab\",\n      \"pmids\": [\"38692525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Chemogenetic activation of KOR-expressing neurons in the basolateral amygdala (BLAKORs) and their projections to the BNST attenuated social stress-escalated alcohol consumption in both male and female mice, identifying the BLAKOR→BNST circuit as a specific pathway through which the dynorphin/KOR system regulates stress-induced alcohol drinking.\",\n      \"method\": \"DREADD chemogenetics in Oprk1-Cre mice (BLA-specific), systemic and BNST-specific KOR antagonism (norBNI), two-bottle choice alcohol consumption after repeated social defeat stress\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — circuit-specific chemogenetics with behavioral readout; preprint, not peer-reviewed; single lab\",\n      \"pmids\": [\"39574601\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A KOR-Cre knockin mouse was generated in which Cre recombinase replaces the initial coding sequence of Oprk1; the allele mediates recombination by E14.5 and is expressed in cerebral cortex, nucleus accumbens, striatum, heart, lung, liver, and retinal bipolar/amacrine cells, providing a genetic map of KOR-expressing cell populations.\",\n      \"method\": \"Knockin mouse generation, Cre-reporter recombination assays, histological characterization across tissues and brain regions\",\n      \"journal\": \"Genesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genetic tool with validated recombination; characterizes endogenous OPRK1 expression pattern at cellular resolution; single lab\",\n      \"pmids\": [\"26575788\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"OPRK1 encodes the kappa opioid receptor (KOR), a GPCR that is activated by dynorphin peptides and signals through Gαi/o to inhibit adenylyl cyclase (requiring peripheral AC3 for analgesic signaling), suppress dopamine release in mesolimbic circuits via VTA KOR activation, and phosphorylate downstream kinases (ERK1/2, p38 MAPK); agonist-occupied KOR is phosphorylated at Ser369 in its C-terminal tail by GRK, initiating β-arrestin-dependent desensitization in a sex-dependent manner that governs tolerance and conditioned aversion; OPRK1 transcription is repressed by androgen receptor binding to its promoter and is regulated by promoter methylation and an upstream indel that reduces transcriptional activity; the receptor localizes to GABAergic OFF and NEUTRAL neurons in the RVM, to dopaminergic VTA neurons whose KOR overexpression recapitulates alcohol dependence phenotypes, and to a BLA→BNST circuit regulating stress-induced alcohol consumption; crystallographic structures of KOR in inactive and active states have defined ligand-binding determinants and activation mechanisms; in neuroendocrine prostate cancer, OPRK1 interacts with SLC9A3R1 to promote autophagic REST degradation downstream of AR de-repression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"OPRK1 encodes the kappa opioid receptor (KOR), a Gαi/o-coupled GPCR activated by dynorphin peptides that operates across pain modulation, aversion/reward circuits, and stress-driven behavior [#3, #11]. Agonist occupancy drives phosphorylation at the C-terminal tail by GRK as the initiating step of β-arrestin-dependent desensitization, and downstream KOR activation increases ERK1/2 and p38 MAPK phosphorylation, with p38 in turn phosphorylating the KIR3.1 (GIRK1) channel [#5]; KOR-dependent ERK1/2 signaling is also functional in immune cells [#4]. Site-specific knockin of four C-terminal phospho-sites establishes that this phosphorylation governs U50,488H tolerance and conditioned place aversion in a sex-dependent manner, attenuating tolerance in males and preventing aversion in females [#6]. Peripheral analgesic signaling requires adenylyl cyclase 3 in DRG neurons, where KOR inhibits voltage-gated potassium channels [#9]. In neural circuits, KOR is expressed on GABAergic OFF/NEUTRAL cells of the rostral ventromedial medulla [#3], on insular GABAergic neurons where it gates pain-related aversive memory [#15], and within the mesolimbic system, where VTA KOR activation is necessary for aversion-induced dopamine suppression and avoidance learning [#11] and KOR overexpression in VTA dopaminergic neurons recapitulates alcohol dependence phenotypes [#12]. Crystallographic structures of inactive (JDTic-bound) and active KOR have defined ligand-binding determinants and enabled structure-based ligand discovery [#10]. Beyond neural function, OPRK1 is transcriptionally repressed by androgen receptor binding at its promoter, and upon AR-inhibitor-driven de-repression interacts with SLC9A3R1 to promote autophagic degradation of REST and neuroendocrine differentiation in prostate cancer [#14]; its expression is also modulated by an upstream regulatory indel and by promoter CpG methylation [#0, #1].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that distinct kappa agonists engage non-equivalent receptor mechanisms, raising the question of how a single locus produces multiple analgesic pathways.\",\n      \"evidence\": \"Exon-specific antisense oligodeoxynucleotide knockdown of KOR-1 with multiple ligands in an in vivo analgesia assay\",\n      \"pmids\": [\"10224306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Splice variants/conformations not molecularly defined\", \"Single lab, antisense specificity not genetically confirmed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved which RVM cell types carry KOR, showing KOR marks GABAergic OFF/NEUTRAL pain-modulating neurons rather than ON cells.\",\n      \"evidence\": \"Electrophysiological cell classification with juxtacellular labeling and KOR/GAD67 immunofluorescence co-labeling\",\n      \"pmids\": [\"17005613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of KOR activation on these cells not directly tested here\", \"Circuit output not measured\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified a functional cis-regulatory determinant of OPRK1 expression, addressing how receptor levels are set.\",\n      \"evidence\": \"Luciferase promoter assay of an upstream indel plus family-based genotyping\",\n      \"pmids\": [\"18319328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous chromatin effect not shown\", \"Transcription factors binding the indel not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the KOR desensitization initiation step and downstream kinase cascade, linking C-terminal phosphorylation to β-arrestin recruitment and effector channel modulation.\",\n      \"evidence\": \"Phospho-selective antibody immunohistochemistry at Ser369 with behavioral stress validation; readouts of ERK1/2, p38, and KIR3.1 phosphorylation\",\n      \"pmids\": [\"21370032\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"β-arrestin recruitment not directly measured here\", \"Stoichiometry of multi-site phosphorylation unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated KOR is a functional signaling receptor on immune cells, extending its role beyond neurons.\",\n      \"evidence\": \"Dynorphin A(1-17) vs inactive A(2-17) stimulation of phospho-ERK1/2 in J774 macrophages by Western blot\",\n      \"pmids\": [\"22424981\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological immune consequence not established\", \"G protein coupling in this context not dissected\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established the limits of dynorphin and 'KOR-selective' ligand specificity using genetic knockouts, a critical caveat for interpreting KOR pharmacology.\",\n      \"evidence\": \"[35S]GTPγS binding in striatal membranes from WT, KOR-KO, and MOR-KO mice\",\n      \"pmids\": [\"26160155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the additional dynorphin-coupled G proteins not defined\", \"Restricted to striatal tissue\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapped endogenous KOR-expressing cell populations across brain and peripheral tissues, providing a genetic substrate for circuit dissection.\",\n      \"evidence\": \"KOR-Cre knockin mouse with reporter recombination and histology\",\n      \"pmids\": [\"26575788\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cre knockin disrupts coding sequence (potential haploinsufficiency)\", \"Expression timing/level not quantified per cell\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked OPRK1 promoter methylation to expression and to demographic variables, addressing epigenetic regulation of the receptor.\",\n      \"evidence\": \"Bisulfite pyrosequencing and dual-luciferase reporter assays in two populations\",\n      \"pmids\": [\"26300544\", \"27838450\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mutagenesis confirming methylation-mediated silencing mechanism\", \"Reporter assays without endogenous validation\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established that VTA KOR activation is necessary for aversion-induced dopamine suppression and avoidance learning, placing KOR causally in mesolimbic aversion encoding.\",\n      \"evidence\": \"Intra-VTA KOR antagonist microinjection with real-time voltammetric dopamine measurement and behavioral avoidance testing in rats\",\n      \"pmids\": [\"32057802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pre/postsynaptic site of KOR action within VTA not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Proved C-terminal phosphorylation governs tolerance and aversion in a sex-dependent manner, dissociating these from acute receptor effects.\",\n      \"evidence\": \"K4A phosphorylation-deficient knockin mice with behavioral assays and receptor binding autoradiography\",\n      \"pmids\": [\"34736959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of sex dependence unknown\", \"Specific arrestin/kinase mediating each behavior not assigned\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified peripheral AC3 as required for KOR analgesia and Kv-channel inhibition, refining the effector requirements of KOR signaling.\",\n      \"evidence\": \"Conditional AC3 KO in DRG with patch-clamp, cAMP, behavior, and AC1-inhibitor rescue\",\n      \"pmids\": [\"34914639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AC3 acts via classical Gαi/o or direct KOR–AC3 interaction not distinguished\", \"Central analgesic mechanisms not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Dissociated central diuretic from peripheral electrolyte-retaining KOR effects on renal function.\",\n      \"evidence\": \"Route-specific (ICV vs IV) norBNI pretreatment with urine/electrolyte measurement in rats\",\n      \"pmids\": [\"36202183\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific central and peripheral KOR sites not identified\", \"Downstream renal signaling unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed KOR within kisspeptin neurons is dispensable for GnRH/LH pulse generation and fertility, a well-controlled negative result for KOR's reproductive role.\",\n      \"evidence\": \"Conditional Oprk1 KO in kisspeptin neurons with LH pulse monitoring, hormone assays, and fertility assessment\",\n      \"pmids\": [\"36260530\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"KOR action on other hypothalamic populations not excluded\", \"Compensation by other opioid receptors not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Consolidated structural understanding of KOR activation and selectivity, enabling rational ligand discovery.\",\n      \"evidence\": \"X-ray crystallography of KOR-JDTic and active-state structures with structure-based virtual screening\",\n      \"pmids\": [\"33945028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"G protein/arrestin-coupled state-specific dynamics not fully captured here\", \"Biased-signaling structural determinants not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified the BLA(KOR)→BNST circuit through which the dynorphin/KOR system regulates stress-escalated alcohol consumption.\",\n      \"evidence\": \"DREADD chemogenetics in Oprk1-Cre mice with circuit-specific norBNI and two-bottle choice after social defeat (preprint)\",\n      \"pmids\": [\"39574601\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Endogenous dynorphin source onto this circuit not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established VTA dopaminergic KOR overexpression as causally sufficient to produce alcohol dependence phenotypes, and placed KOR upstream of insular GABAergic control of pain-aversive memory.\",\n      \"evidence\": \"Cre-Lox Oprk1 overexpression in VTA DA neurons with alcohol self-administration; pharmacological KOR manipulation plus GABAergic DREADDs in insular cortex\",\n      \"pmids\": [\"36764577\", \"37679857\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression may exceed physiological KOR levels\", \"Synaptic mechanism of KOR-GABAergic inhibition not detailed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a non-neural OPRK1 axis in cancer: AR represses OPRK1, and de-repressed OPRK1 drives REST autophagic degradation via SLC9A3R1 to induce neuroendocrine differentiation.\",\n      \"evidence\": \"AR ChIP at OPRK1 promoter, OPRK1–SLC9A3R1 co-IP, autophagy flux, REST Western blot, and pharmacological rescue in prostate cancer\",\n      \"pmids\": [\"41353213\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GPCR signaling contribution vs scaffold role of OPRK1 not separated\", \"Single lab, reciprocal co-IP validation not detailed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how KOR distinguishes among its diverse ligand-, circuit-, and tissue-specific outputs at the molecular level, including the structural basis of biased signaling and the determinants of sex-dependent behavioral effects.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of biased agonism linked to behavior\", \"Molecular basis of sex-dependent phosphorylation effects unknown\", \"G protein/effector selectivity across tissues not unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 11, 9]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 9, 11]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 11, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SLC9A3R1\", \"AC3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}