{"gene":"CORT","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1997,"finding":"Human preprocortistatin cDNA was cloned and mapped to chromosome 1p36 (mouse chromosome 4); the encoded peptide cortistatin-17 (hCS-17) binds all five human somatostatin receptor (SSTR) subtypes and inhibits forskolin-stimulated cAMP production through SSTRs; intracerebroventricular administration flattened cortical and hippocampal EEGs in rats.","method":"cDNA cloning from human fetal brain EST library, radioligand binding assay on cells expressing each SSTR subtype, cAMP inhibition assay, in vivo EEG recording","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (binding, cAMP, in vivo EEG) in single foundational paper","pmids":["9125122"],"is_preprint":false},{"year":1997,"finding":"Mouse and human preprocortistatin genes were cloned; mouse cortistatin mRNA is expressed in cortical and hippocampal GABAergic interneurons; the gene maps to mouse chromosome 4 / human 1p36; only cortistatin-14 is predicted as the sole mature cleavage product based on conservation of dibasic cleavage sites.","method":"cDNA cloning, Northern blot, in situ hybridization, chromosomal mapping (conserved synteny analysis)","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, foundational cloning paper replicated across species","pmids":["9205124"],"is_preprint":false},{"year":1999,"finding":"Rat preprocortistatin (PPCST) stably expressed in AtT-20 pituitary cells is processed to both CST-14 and CST-29 via cleavage at C-terminal dibasic sites; CST-14 is preferentially released (63–70%) via the regulated secretory pathway under basal and forskolin-stimulated conditions.","method":"Stable transfection of AtT-20 cells, HPLC separation, radioimmunoassay of secreted products, forskolin stimulation","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of processing with HPLC/RIA characterization of cleavage products","pmids":["10461921"],"is_preprint":false},{"year":2000,"finding":"Cortistatin-14 shares binding to all five cloned somatostatin receptors but has distinct physiological properties including induction of slow-wave sleep (by antagonizing acetylcholine excitatory effects on cortex), reduction of locomotor activity, and activation of cation-selective currents not responsive to somatostatin; cortistatin mRNA follows a circadian rhythm and is upregulated by sleep deprivation.","method":"Review synthesizing electrophysiology, behavioral pharmacology, receptor binding, and expression studies","journal":"Brain research. Brain research reviews","confidence":"Medium","confidence_rationale":"Tier 2-3 — review synthesizing multiple experimental findings; individual experimental bases are moderate","pmids":["11011067"],"is_preprint":false},{"year":2000,"finding":"Fine mapping placed the human CORT gene to chromosome 1p36.3→p36.2 near marker D1S244; the gene consists of two exons divided by a ~1 kb intron; two synonymous polymorphisms were detected in the coding region but no mutations were found in 49 primary neuroblastomas.","method":"Radiation hybrid mapping, BAC physical mapping, BAC sequencing, genomic sequencing of 49 tumor samples","journal":"Cytogenetics and cell genetics","confidence":"High","confidence_rationale":"Tier 1-2 — direct genomic sequencing and physical mapping with multiple orthogonal approaches","pmids":["10894940"],"is_preprint":false},{"year":2001,"finding":"Cortistatin (but not somatostatin) binds to growth hormone secretagogue receptors (GHS-R) in human pituitary membranes, competing with 125I-Tyr-Ala-hexarelin and ghrelin; CST-14 and ghrelin showed similar affinity (~5×10⁻⁷ mol/L) for GHS-R, whereas somatostatin fragments did not displace binding.","method":"Radioligand competition binding assay on human pituitary membranes using 125I-Tyr-Ala-hexarelin","journal":"Journal of endocrinological investigation","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding assay on native human tissue, single lab but clear pharmacological distinction from somatostatin","pmids":["11227737"],"is_preprint":false},{"year":2002,"finding":"In humans, intravenous cortistatin-14 inhibits basal and GHRH-stimulated GH secretion and insulin secretion to the same extent as somatostatin-14; unlike somatostatin, CST-14 also binds GHS-R and partially blunts ghrelin-induced GH release; neither CST-14 nor SST-14 modified PRL or ACTH responses to ghrelin.","method":"Randomized crossover clinical study in 6 normal adults; hormone measurements by RIA/IRMA during iv infusion of CST-14, SS-14, GHRH, and ghrelin","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — controlled human in vivo pharmacology, small n but rigorous crossover design","pmids":["12161511"],"is_preprint":false},{"year":2003,"finding":"MrgX2 (MRGPRX2), an orphan G-protein-coupled receptor expressed in dorsal root ganglion, was identified as a high-potency receptor for cortistatin-14; cortistatin stimulated intracellular Ca²⁺ increases (Gq-coupled) but had no effect on cAMP in MrgX2-expressing cells; MrgX2 has a pharmacological profile distinct from other Mrg family members.","method":"Reverse pharmacology/expression cloning, calcium mobilization assay, cAMP assay, immunohistochemistry, quantitative PCR","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — receptor identification with multiple functional readouts (Ca²⁺, cAMP) and expression profiling; foundational receptor identification paper","pmids":["12915402"],"is_preprint":false},{"year":2003,"finding":"Human monocytes, macrophages, and dendritic cells selectively express sst2 mRNA and cortistatin (CST) mRNA but not somatostatin mRNA; CST mRNA is upregulated during monocyte-to-macrophage/DC differentiation and by LPS stimulation; sst2 protein is present on macrophages but not dendritic cells; CST displaces [125I-Tyr3]octreotide from sst2-expressing cells, indicating CST acts as the endogenous sst2 ligand in immune cells rather than somatostatin.","method":"RT-PCR, quantitative RT-PCR, ELISA, confocal microscopy, autoradiography, radioligand binding competition","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including direct binding assay and protein-level confirmation","pmids":["12684217"],"is_preprint":false},{"year":2003,"finding":"Human lymphoid tissues and immune cells express CST mRNA (but not SS mRNA, except thymus); CST mRNA expression levels differ across tissues and immune cell types; CST is proposed as the endogenous ligand for sst2 in the human immune system; two differently sized CST cDNA fragments were detected, with T-cell lines expressing both and most B-cell lines expressing only the short fragment.","method":"RT-PCR, quantitative RT-PCR, autoradiography on thymic tissue, radioligand displacement assay","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods, single lab; binding evidence is indirect (displacement assay)","pmids":["12519865"],"is_preprint":false},{"year":2003,"finding":"Cortistatin mRNA and protein are present in human pancreatic islet cells (but not exocrine pancreas); islet cells expressing CST also express somatostatin receptors sst2, sst3, and sst5, as well as ghrelin and GHS receptors, suggesting local autocrine/paracrine cortistatin circuits in the endocrine pancreas.","method":"RT-PCR, in situ hybridization, immunohistochemistry with anti-CST-17 antibody","journal":"Journal of endocrinological investigation","confidence":"Medium","confidence_rationale":"Tier 2-3 — localization by multiple methods but no functional readout in pancreatic tissue","pmids":["14669820"],"is_preprint":false},{"year":2005,"finding":"Cortistatin is abundant in human vitreous fluid and significantly contributes to somatostatin-like immunoreactivity (SLI) in vitreous; intravitreous cortistatin levels were higher than plasma levels in both nondiabetic controls and diabetic patients with PDR.","method":"Radioimmunoassay with HPLC separation of vitreous and plasma samples from 22 diabetic PDR patients and 22 controls","journal":"Diabetes care","confidence":"Medium","confidence_rationale":"Tier 2 — direct quantitative measurement in human clinical samples with HPLC/RIA; localization finding","pmids":["16043736"],"is_preprint":false},{"year":2008,"finding":"Cortistatin is produced by the human retina (both neuroretina and RPE); CST mRNA levels are significantly lower in diabetic retinas compared to nondiabetic donors in both RPE and neuroretina; reduced CST expression is associated with increased GFAP (glial activation) and higher apoptosis (TUNEL-positive cells), establishing CST reduction as an early event in diabetic retinopathy.","method":"RT-PCR, confocal laser microscopy immunofluorescence, TUNEL assay in postmortem human eye tissue from 5 diabetic and 5 nondiabetic donors","journal":"Molecular vision","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods in human tissue; associative but direct expression/localization data","pmids":["18709137"],"is_preprint":false},{"year":2010,"finding":"Expression of cortistatin (CST) mRNA is reduced in multiple regions of the temporal lobe in Alzheimer's disease patients compared to controls, alongside reduction of somatostatin, somatostatin receptors (sst1-5), and dopamine receptors; neprilysin expression was not altered, suggesting that Aβ accumulation results from lack of SST/CST activation of neprilysin rather than reduced neprilysin expression.","method":"Quantitative real-time PCR on postmortem temporal lobe tissue from AD patients and age-matched controls","journal":"Journal of Alzheimer's disease : JAD","confidence":"Medium","confidence_rationale":"Tier 3 — quantitative expression analysis in human tissue, single method, mechanistic inference","pmids":["20164562"],"is_preprint":false},{"year":2013,"finding":"Cortistatin inhibits platelet-derived growth factor (PDGF)-stimulated proliferation of human vascular smooth muscle cells (SMCs) via binding to somatostatin receptors (sst2 and sst5) and ghrelin receptor, with downstream induction of cAMP and p38-MAPK and inhibition of Akt; cortistatin also impairs lamellipodia formation and migration of SMCs toward PDGF by inhibiting Rac1 activation and cytosolic calcium increases in a ghrelin-receptor-dependent manner; cortistatin-deficient mice develop greater neointimal hyperplasia after carotid artery ligation.","method":"Cell proliferation assays, receptor binding (sst2/sst5/ghrelin-R), cAMP measurement, p38/Akt Western blot, Rac1 activity assay, calcium imaging, in vivo carotid ligation model in cortistatin-knockout mice","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal in vitro and in vivo methods, receptor-specific pharmacology, knockout validation","pmids":["23595952"],"is_preprint":false},{"year":2014,"finding":"Cortistatin-14 exerts anticonvulsant effects in a pilocarpine-induced seizure model in rats and mice; these anticonvulsant actions are mediated by sst2 and sst3 receptors (selective antagonists for each independently reverse the effect), but not by ghrelin receptors (ghrelin receptor knockout mice show comparable CST-14 anticonvulsant effect to wild-type).","method":"In vivo microdialysis, telemetry-based EEG recording, pharmacological antagonism with selective sst2 antagonist (cyanamid15486) and sst3 antagonist (SST3-ODN-8), ghrelin receptor knockout mice","journal":"CNS neuroscience & therapeutics","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic and pharmacological epistasis with multiple receptor-selective tools and knockout model","pmids":["24685142"],"is_preprint":false},{"year":2019,"finding":"Cortistatin competitively binds to TNF-α receptors TNFR1 and TNFR2 (demonstrated by co-immunoprecipitation and biotin-based solid-phase binding assay), suppresses pro-inflammatory TNF-α function, inhibits NF-κB signaling in chondrocytes, and attenuates osteoarthritis development in vivo; CST-deficient mice show accelerated OA-like phenotype and TNFR1/TNFR2 knockout mice show reduced protective effect of CST.","method":"Co-immunoprecipitation, biotin-based solid-phase binding assay, Western blot, RT-PCR, ELISA, immunofluorescence, NF-κB pathway analysis, surgically-induced and spontaneous OA mouse models, TNFR knockout mice, flow cytometry","journal":"EBioMedicine","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding demonstrated by two methods, multiple in vitro and in vivo approaches including receptor-specific knockouts","pmids":["30826358"],"is_preprint":false},{"year":2020,"finding":"Cortistatin expression in nucleus pulposus (NP) cells is reduced during aging and TNF-α-induced intervertebral disc degeneration; CST-knockout mice show accelerated metabolic imbalance, enhanced apoptosis, and disorganized NP tissue; exogenous CST inhibits mitochondrial dysfunction and suppresses NLRP3 inflammasome activation through mitochondrial ROS-dependent mechanisms; increased NF-κB pathway activity was associated with IVD degeneration in CST-/- mice.","method":"NP tissue/cell isolation from patients and mice, CST-knockout mouse model, TNF-α stimulation, mitochondrial ROS measurement, NLRP3 inflammasome activity assay, NF-κB pathway analysis, Western blot, immunohistochemistry, in vitro and ex vivo experiments","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 — knockout validation combined with mechanistic pathway analysis and multiple orthogonal methods","pmids":["32550919"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of MRGPRX2-Gi1 complex bound to cortistatin-14 were resolved; cortistatin-14 occupies a shallow, solvent-exposed ligand-binding pocket; MRGPRX2 shows an unusual kink at TM6 and replacement of the general toggle switch Trp6.48 with Gly6.48, suggesting a distinct activation mechanism; the receptor couples to both Gi and Gq in mast cells.","method":"Cryo-electron microscopy structure determination, functional validation (Gi/Gq coupling), antagonist probe development","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — atomic-resolution cryo-EM structure with functional validation; replicated across two concurrent Nature papers","pmids":["34789874","34789875"],"is_preprint":false}],"current_model":"Cortistatin (encoded by CORT) is a neuropeptide processed from preprocortistatin (primarily to CST-14 via regulated secretory pathway) that signals through all five somatostatin receptors (sharing the sst2 system with somatostatin in immune cells where it is the predominant endogenous ligand), the ghrelin/GHS receptor, and MRGPRX2 (a Gq/Gi-coupled receptor in dorsal root ganglion and mast cells whose cryo-EM structure with cortistatin-14 has been resolved); cortistatin additionally binds directly to TNF-α receptors (TNFR1/TNFR2) to suppress NF-κB-dependent inflammation, inhibits vascular smooth muscle cell proliferation and migration via sst2/sst5/ghrelin-R signaling, exerts anticonvulsant effects via sst2 and sst3, suppresses NLRP3 inflammasome activation through mitochondrial ROS inhibition, and is expressed in cortical GABAergic interneurons, retina, pancreatic islets, and immune cells where its reduction is linked to diabetic retinopathy, Alzheimer's disease, and intervertebral disc degeneration."},"narrative":{"teleology":[{"year":1997,"claim":"Cloning of human preprocortistatin revealed a new neuropeptide that shares all five somatostatin receptors yet produces distinct neurophysiological effects (cortical EEG flattening), establishing cortistatin as a somatostatin-related but functionally distinct signaling molecule.","evidence":"cDNA cloning from human fetal brain, radioligand binding at five SSTRs, cAMP inhibition assays, and in vivo rat EEG recording; parallel mouse/human gene cloning with in situ hybridization localizing expression to cortical/hippocampal GABAergic interneurons","pmids":["9125122","9205124"],"confidence":"High","gaps":["No cortistatin-specific receptor identified at this stage","Mature peptide form(s) generated in vivo not yet resolved","Peripheral expression and function unexplored"]},{"year":1999,"claim":"Reconstitution of preprocortistatin processing in neuroendocrine cells demonstrated that CST-14 is the predominant mature cleavage product released via the regulated secretory pathway, resolving the identity of the bioactive peptide.","evidence":"Stable transfection of AtT-20 cells with rat preprocortistatin, HPLC separation and RIA quantification of secreted products","pmids":["10461921"],"confidence":"High","gaps":["Processing in non-neuroendocrine tissues unknown","Convertase(s) responsible for cleavage not identified"]},{"year":2001,"claim":"Identification of cortistatin—but not somatostatin—as a ligand for the growth hormone secretagogue receptor (GHS-R) established the first receptor pharmacology distinguishing cortistatin from somatostatin.","evidence":"Radioligand competition binding on human pituitary membranes; confirmed in vivo by clinical crossover study showing CST-14 blunts ghrelin-induced GH release","pmids":["11227737","12161511"],"confidence":"Medium","gaps":["Physiological relevance of GHS-R engagement in non-pituitary tissues not determined","Small clinical cohort (n=6)"]},{"year":2003,"claim":"Discovery that immune cells express cortistatin (but not somatostatin) alongside sst2 redefined cortistatin as the endogenous sst2 ligand in the immune system, while identification of MRGPRX2 as a cortistatin-specific Gq-coupled receptor in sensory neurons revealed a second non-somatostatin receptor.","evidence":"RT-PCR, radioligand displacement, and confocal microscopy in human monocytes/macrophages/DCs; reverse pharmacology with Ca²⁺ mobilization and cAMP assays in MRGPRX2-expressing cells; expression profiling in DRG neurons","pmids":["12684217","12519865","12915402"],"confidence":"High","gaps":["Downstream signaling cascades in immune cells not characterized","MRGPRX2 function in mast cells not yet addressed","Relative contributions of sst2 vs. MRGPRX2 signaling unclear"]},{"year":2003,"claim":"Localization of cortistatin mRNA and protein in human pancreatic islets and retinal tissue expanded the known sites of cortistatin action beyond the CNS, with subsequent clinical data revealing reduced CST expression in diabetic retinopathy.","evidence":"RT-PCR, in situ hybridization, and immunohistochemistry in human pancreatic islets; RIA/HPLC of vitreous fluid; immunofluorescence and TUNEL assays in postmortem diabetic vs. nondiabetic retinal tissue","pmids":["14669820","16043736","18709137"],"confidence":"Medium","gaps":["Functional role of cortistatin in islet hormone regulation not demonstrated by intervention","Whether CST reduction is causal in diabetic retinopathy or a consequence of disease","Retinal receptor mediating CST effects unidentified"]},{"year":2013,"claim":"Mechanistic dissection in vascular smooth muscle cells showed that cortistatin inhibits PDGF-driven proliferation and migration through sst2, sst5, and ghrelin receptor signaling (via cAMP/p38 induction, Akt inhibition, and Rac1 suppression), with cortistatin-knockout mice validating the vascular protective role in vivo.","evidence":"Receptor-selective pharmacology, proliferation/migration assays, Rac1/Akt/p38 biochemistry, calcium imaging, and carotid artery ligation model in CST-knockout mice","pmids":["23595952"],"confidence":"High","gaps":["Whether CST acts in an autocrine or paracrine fashion in vasculature unknown","Contribution of each receptor subtype to in vivo neointima prevention not individually resolved"]},{"year":2014,"claim":"Pharmacological and genetic epistasis experiments established that cortistatin's anticonvulsant activity is mediated by sst2 and sst3 (each independently necessary) and is independent of the ghrelin receptor, refining the receptor logic underlying cortistatin's neuronal functions.","evidence":"In vivo pilocarpine-induced seizure model with selective sst2 and sst3 antagonists, ghrelin receptor knockout mice, EEG telemetry","pmids":["24685142"],"confidence":"High","gaps":["Downstream intracellular pathways mediating anticonvulsant effect unexplored","Whether cortistatin affects seizure circuits via inhibitory interneurons or direct postsynaptic action unresolved"]},{"year":2019,"claim":"Identification of direct cortistatin binding to TNFR1 and TNFR2 revealed a receptor interaction independent of the somatostatin/ghrelin receptor families, providing a mechanism for cortistatin's anti-inflammatory effects through competitive suppression of TNF-α/NF-κB signaling.","evidence":"Co-immunoprecipitation and biotin-based solid-phase binding assay, NF-κB pathway analysis, surgically-induced OA in CST-knockout and TNFR-knockout mice","pmids":["30826358"],"confidence":"High","gaps":["Structural basis of CST–TNFR interaction unresolved","Whether CST–TNFR binding occurs in all TNF-responsive tissues or is context-restricted"]},{"year":2020,"claim":"Studies in CST-knockout mice and human disc tissue demonstrated that cortistatin suppresses NLRP3 inflammasome activation via inhibition of mitochondrial ROS, establishing a new effector arm of cortistatin's anti-inflammatory mechanism distinct from NF-κB blockade.","evidence":"CST-knockout mouse intervertebral disc degeneration model, TNF-α stimulation of nucleus pulposus cells, mitochondrial ROS measurement, NLRP3 inflammasome activity assays","pmids":["32550919"],"confidence":"High","gaps":["Receptor(s) mediating mitochondrial ROS inhibition in NP cells not identified","Whether NLRP3 suppression is a general cortistatin function or tissue-specific"]},{"year":2021,"claim":"Cryo-EM resolution of the MRGPRX2–Gi1 complex bound to cortistatin-14 provided the first atomic-level view of cortistatin receptor engagement, revealing a shallow binding pocket and an unconventional activation mechanism involving Gly6.48 replacement of the canonical toggle switch.","evidence":"Cryo-electron microscopy structure determination with functional Gi/Gq coupling validation","pmids":["34789874","34789875"],"confidence":"High","gaps":["No structure of cortistatin bound to any somatostatin receptor or TNFR","MRGPRX2 signaling downstream of Gq/Gi in mast cell degranulation not fully resolved"]},{"year":null,"claim":"Key unresolved questions include the structural basis of cortistatin engagement with somatostatin receptors and TNFRs, the identity of receptor(s) mediating cortistatin's metabolic effects in pancreatic islets, whether cortistatin reduction in Alzheimer's disease and diabetic retinopathy is causally pathogenic, and the relative signaling contributions of each receptor in different tissue contexts.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural data for CST at any somatostatin receptor","Causal role of CST loss in neurodegeneration unproven","Tissue-specific receptor hierarchy for CST signaling unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,5,7,14,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,16,17]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[2,6,11]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,7,14,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,9,16,17]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,3,15]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[17]}],"complexes":[],"partners":["SSTR1","SSTR2","SSTR3","SSTR5","GHSR","MRGPRX2","TNFRSF1A","TNFRSF1B"],"other_free_text":[]},"mechanistic_narrative":"Cortistatin is a neuropeptide derived from preprocortistatin (primarily processed to CST-14 via the regulated secretory pathway) that functions as a pleiotropic anti-inflammatory and neuromodulatory signaling molecule, acting through somatostatin receptors (sst1–sst5), the ghrelin/GHS receptor, MRGPRX2, and TNF-α receptors (TNFR1/TNFR2) [PMID:9125122, PMID:12915402, PMID:30826358]. In the nervous system, cortistatin is expressed in cortical GABAergic interneurons, enhances slow-wave sleep by antagonizing cholinergic cortical excitation, and exerts anticonvulsant effects mediated specifically through sst2 and sst3 [PMID:9205124, PMID:24685142]. In the immune system, cortistatin—rather than somatostatin—serves as the predominant endogenous sst2 ligand in monocytes, macrophages, and dendritic cells, and additionally suppresses NF-κB-dependent inflammation by competing with TNF-α for TNFR1/TNFR2 binding and by inhibiting NLRP3 inflammasome activation through blockade of mitochondrial ROS [PMID:12684217, PMID:30826358, PMID:32550919]. Cortistatin also inhibits vascular smooth muscle cell proliferation and migration via sst2/sst5 and ghrelin receptor signaling, with cortistatin-deficient mice developing exaggerated neointimal hyperplasia [PMID:23595952]."},"prefetch_data":{"uniprot":{"accession":"O00230","full_name":"Cortistatin","aliases":[],"length_aa":105,"mass_kda":11.5,"function":"Precursor of neuropeptides that bind to all somatostatin receptor (SSTR) subtypes (PubMed:9125122). Inhibits cAMP production induced by forskolin through SSTRs (PubMed:9125122) Neuropeptide with neuronal depressant and sleep-modulating properties (By similarity). Acts as a ligand for MRGPRX2 receptor in mast cells (PubMed:12915402, PubMed:34789874, PubMed:34789875)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/O00230/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CORT","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CORT","total_profiled":1310},"omim":[{"mim_id":"609130","title":"CENTROMERIC PROTEIN S; CENPS","url":"https://www.omim.org/entry/609130"},{"mim_id":"607444","title":"SBDS RIBOSOME MATURATION FACTOR; SBDS","url":"https://www.omim.org/entry/607444"},{"mim_id":"602784","title":"CORTISTATIN; CORT","url":"https://www.omim.org/entry/602784"},{"mim_id":"601523","title":"GROWTH FACTOR RECEPTOR-BOUND PROTEIN 10; GRB10","url":"https://www.omim.org/entry/601523"},{"mim_id":"601522","title":"GROWTH FACTOR RECEPTOR-BOUND PROTEIN 7; GRB7","url":"https://www.omim.org/entry/601522"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":66.5}],"url":"https://www.proteinatlas.org/search/CORT"},"hgnc":{"alias_symbol":["MGC32686","SST2"],"prev_symbol":[]},"alphafold":{"accession":"O00230","domains":[{"cath_id":"-","chopping":"6-99","consensus_level":"medium","plddt":63.4378,"start":6,"end":99}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00230","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00230-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00230-F1-predicted_aligned_error_v6.png","plddt_mean":62.84},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CORT","jax_strain_url":"https://www.jax.org/strain/search?query=CORT"},"sequence":{"accession":"O00230","fasta_url":"https://rest.uniprot.org/uniprotkb/O00230.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00230/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00230"}},"corpus_meta":[{"pmid":"2830483","id":"PMC_2830483","title":"Pheromonal 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Brain research reviews","url":"https://pubmed.ncbi.nlm.nih.gov/11011067","citation_count":166,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12684217","id":"PMC_12684217","title":"Expression of somatostatin, cortistatin, and somatostatin receptors in human monocytes, macrophages, and dendritic cells.","date":"2003","source":"American journal of physiology. Endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/12684217","citation_count":151,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9125122","id":"PMC_9125122","title":"Identification and characterization of a novel human cortistatin-like peptide.","date":"1997","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/9125122","citation_count":136,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34789875","id":"PMC_34789875","title":"Structure, function and pharmacology of human itch receptor complexes.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/34789875","citation_count":128,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32550919","id":"PMC_32550919","title":"Cortistatin protects against intervertebral disc degeneration through targeting mitochondrial ROS-dependent NLRP3 inflammasome activation.","date":"2020","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/32550919","citation_count":124,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11227737","id":"PMC_11227737","title":"Cortistatin, but not somatostatin, binds to growth hormone secretagogue (GHS) receptors of human pituitary gland.","date":"2001","source":"Journal of endocrinological investigation","url":"https://pubmed.ncbi.nlm.nih.gov/11227737","citation_count":111,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9205124","id":"PMC_9205124","title":"Cloning, mRNA expression, and chromosomal mapping of mouse and human preprocortistatin.","date":"1997","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/9205124","citation_count":97,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19086053","id":"PMC_19086053","title":"Identification of new putative susceptibility genes for several psychiatric disorders by association analysis of regulatory and non-synonymous SNPs of 306 genes involved in neurotransmission and neurodevelopment.","date":"2009","source":"American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19086053","citation_count":81,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12519865","id":"PMC_12519865","title":"Cortistatin rather than somatostatin as a potential endogenous ligand for somatostatin receptors in the human immune system.","date":"2003","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/12519865","citation_count":75,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18709137","id":"PMC_18709137","title":"Lowered cortistatin expression is an early event in the human diabetic retina and is associated with apoptosis and glial activation.","date":"2008","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/18709137","citation_count":71,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12161511","id":"PMC_12161511","title":"Endocrine activities of cortistatin-14 and its interaction with GHRH and ghrelin in humans.","date":"2002","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/12161511","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30826358","id":"PMC_30826358","title":"Cortistatin binds to TNF-α receptors and protects against osteoarthritis.","date":"2019","source":"EBioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/30826358","citation_count":60,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11329013","id":"PMC_11329013","title":"Creation of genome-wide protein expression libraries using random activation of gene expression.","date":"2001","source":"Nature biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/11329013","citation_count":59,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20398908","id":"PMC_20398908","title":"Comprehensive copy number variant (CNV) analysis of neuronal pathways genes in psychiatric disorders identifies rare variants within patients.","date":"2010","source":"Journal of psychiatric research","url":"https://pubmed.ncbi.nlm.nih.gov/20398908","citation_count":59,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20164562","id":"PMC_20164562","title":"Expression of Somatostatin, cortistatin, and their receptors, as well as dopamine receptors, but not of neprilysin, are reduced in the temporal lobe of Alzheimer's disease patients.","date":"2010","source":"Journal of Alzheimer's disease : JAD","url":"https://pubmed.ncbi.nlm.nih.gov/20164562","citation_count":58,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23595952","id":"PMC_23595952","title":"Cortistatin inhibits migration and proliferation of human vascular smooth muscle cells and decreases neointimal formation on carotid artery ligation.","date":"2013","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/23595952","citation_count":57,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16043736","id":"PMC_16043736","title":"Somatostatin molecular variants in the vitreous fluid: a comparative study between diabetic patients with proliferative diabetic retinopathy and nondiabetic control subjects.","date":"2005","source":"Diabetes care","url":"https://pubmed.ncbi.nlm.nih.gov/16043736","citation_count":49,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28650319","id":"PMC_28650319","title":"Somatostatin binds to the human amyloid β peptide and favors the formation of distinct oligomers.","date":"2017","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/28650319","citation_count":37,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18450367","id":"PMC_18450367","title":"The role of cortistatin in the human immune system.","date":"2008","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/18450367","citation_count":28,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10461921","id":"PMC_10461921","title":"Processing of rat preprocortistatin in mouse AtT-20 cells.","date":"1999","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10461921","citation_count":23,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14669820","id":"PMC_14669820","title":"Presence of cortistatin in the human pancreas.","date":"2003","source":"Journal of endocrinological investigation","url":"https://pubmed.ncbi.nlm.nih.gov/14669820","citation_count":22,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31574507","id":"PMC_31574507","title":"Cytoskeleton Protein Filamin A Is Required for Efficient Somatostatin Receptor Type 2 Internalization and Recycling through Rab5 and Rab4 Sorting Endosomes in Tumor Somatotroph Cells.","date":"2019","source":"Neuroendocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/31574507","citation_count":16,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":58660,"output_tokens":1193,"usd":0.096937},"stage2":{"model":"claude-opus-4-6","input_tokens":4008,"output_tokens":1695,"usd":0.093622},"total_usd":0.524829,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":73721,"output_tokens":5426,"usd":0.151277},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":8754,"output_tokens":3129,"usd":0.182993}},"stage1_raw":"Looking at the corpus, I need to identify what gene \"CORT\" refers to. Paper [56] explicitly discusses \"the human preprocortistatin gene (CORT)\" and describes cortistatin-17 (hCST-17), a neuropeptide structurally related to somatostatin. Paper [92] discusses SST, CORT and ghrelin systems. Paper [89] discusses cortistatin-14 (CST-14) mediating anticonvulsant effects via sst2 and sst3 receptors.\n\nThe vast majority of the corpus is about sST2 (soluble ST2/IL1RL1), sst2 (somatostatin receptor subtype 2), SST2 (yeast RGS protein), or CORT used as an abbreviation for corticosterone in pharmacology papers — none of which are the human CORT gene (preprocortistatin).\n\nOnly papers [56], [89], and [92] are directly relevant to the human CORT gene (preprocortistatin/cortistatin).\n\nLet me extract mechanistic findings from these:\n\n- Paper [56]: Maps CORT gene to 1p36.3→p36.2, defines 2-exon/1-intron structure, notes cortistatin has affinity to all SST receptor subtypes\n- Paper [89]: CST-14 mediates anticonvulsant effects via sst2 and sst3 (not ghrelin receptors) — functional receptor pharmacology\n- Paper [92]: Reviews SST/CORT and ghrelin systems at endocrine pancreas\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"The human preprocortistatin gene (CORT) was mapped to chromosome region 1p36.3→p36.2 by radiation hybrid and BAC physical mapping. Genomic sequencing revealed the gene consists of two exons divided by a ~1-kb intron. Two polymorphic sites were identified in the coding region, neither causing amino acid exchange. Expression was detected in neuroblastomas of all stages and in ganglioneuromas.\",\n      \"method\": \"Radiation hybrid mapping, BAC physical mapping, BAC sequencing, genomic sequencing, expression analysis\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct genomic mapping and sequencing with functional validation of gene structure\",\n      \"pmids\": [\"10894940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cortistatin-14 (CST-14), the processed product of the CORT gene, mediates anticonvulsant effects via sst2 and sst3 somatostatin receptors but not via ghrelin receptors. Co-perfusion of a selective sst2 antagonist (cyanamid15486) or a selective sst3 antagonist (SST3-ODN-8) independently reversed the anticonvulsant effect of CST-14. Ghrelin receptor knockout mice showed comparable CST-14-induced seizure reduction to wild-type littermates.\",\n      \"method\": \"In vivo microdialysis, telemetry-based EEG recordings in pilocarpine seizure model, selective receptor antagonists, ghrelin receptor knockout mice\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean pharmacological dissection with receptor-selective antagonists and genetic knockout, single study\",\n      \"pmids\": [\"24685142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cortistatin (CORT) and its receptors (sst1-5) are expressed at the endocrine pancreas and are involved in modulation of pancreatic islet function, influencing insulin secretion and glucose homeostasis. CORT shares receptor binding with somatostatin across all five sst subtypes.\",\n      \"method\": \"Review of expression and functional studies at the endocrine pancreas\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — review/summary without original experimental data\",\n      \"pmids\": [\"23162532\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"The human CORT gene encodes preprocortistatin, a two-exon gene on chromosome 1p36.3→p36.2 whose processed peptide product cortistatin-14/17 binds all five somatostatin receptor subtypes (sst1–sst5) and mediates anticonvulsant effects specifically through sst2 and sst3 receptors (not ghrelin receptors), with proposed roles in modulating pancreatic islet function and insulin secretion.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to identify papers about the canonical human CORT gene (preprocortistatin/cortistatin neuropeptide) versus papers about other genes that happen to share naming conventions (like SST2/sst2 somatostatin receptor, sST2/ST2 IL-33 receptor, CORT as corticosterone abbreviation, etc.).\n\n**Classification:**\n- Papers about somatostatin receptor sst2 (SST2 gene): EXCLUDE (alias collision - different gene)\n- Papers about sST2/ST2 IL-33 receptor (IL1RL1 gene): EXCLUDE (alias collision - different gene)  \n- Papers about SST2/Sst2 as yeast RGS protein: EXCLUDE (symbol collision - non-orthologous)\n- Papers using CORT as abbreviation for corticosterone: EXCLUDE (not the gene)\n- Papers about CORT gene (preprocortistatin/cortistatin): KEEP\n\nKEPT papers: PMID:12915402, PMID:34789874, PMID:34789875, PMID:11011067, PMID:9125122, PMID:12684217, PMID:12519865, PMID:10894940, PMID:32550919, PMID:11227737, PMID:9205124, PMID:18709137, PMID:12161511, PMID:23595952, PMID:16043736, PMID:28650319, PMID:18450367, PMID:10461921, PMID:14669820, PMID:20164562, PMID:92(Role of SST, CORT and ghrelin), PMID:89(Cortistatin-14 anticonvulsant)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Human preprocortistatin cDNA was cloned and mapped to chromosome 1p36 (mouse chromosome 4); the encoded peptide cortistatin-17 (hCS-17) binds all five human somatostatin receptor (SSTR) subtypes and inhibits forskolin-stimulated cAMP production through SSTRs; intracerebroventricular administration flattened cortical and hippocampal EEGs in rats.\",\n      \"method\": \"cDNA cloning from human fetal brain EST library, radioligand binding assay on cells expressing each SSTR subtype, cAMP inhibition assay, in vivo EEG recording\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (binding, cAMP, in vivo EEG) in single foundational paper\",\n      \"pmids\": [\"9125122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Mouse and human preprocortistatin genes were cloned; mouse cortistatin mRNA is expressed in cortical and hippocampal GABAergic interneurons; the gene maps to mouse chromosome 4 / human 1p36; only cortistatin-14 is predicted as the sole mature cleavage product based on conservation of dibasic cleavage sites.\",\n      \"method\": \"cDNA cloning, Northern blot, in situ hybridization, chromosomal mapping (conserved synteny analysis)\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, foundational cloning paper replicated across species\",\n      \"pmids\": [\"9205124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rat preprocortistatin (PPCST) stably expressed in AtT-20 pituitary cells is processed to both CST-14 and CST-29 via cleavage at C-terminal dibasic sites; CST-14 is preferentially released (63–70%) via the regulated secretory pathway under basal and forskolin-stimulated conditions.\",\n      \"method\": \"Stable transfection of AtT-20 cells, HPLC separation, radioimmunoassay of secreted products, forskolin stimulation\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of processing with HPLC/RIA characterization of cleavage products\",\n      \"pmids\": [\"10461921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Cortistatin-14 shares binding to all five cloned somatostatin receptors but has distinct physiological properties including induction of slow-wave sleep (by antagonizing acetylcholine excitatory effects on cortex), reduction of locomotor activity, and activation of cation-selective currents not responsive to somatostatin; cortistatin mRNA follows a circadian rhythm and is upregulated by sleep deprivation.\",\n      \"method\": \"Review synthesizing electrophysiology, behavioral pharmacology, receptor binding, and expression studies\",\n      \"journal\": \"Brain research. Brain research reviews\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — review synthesizing multiple experimental findings; individual experimental bases are moderate\",\n      \"pmids\": [\"11011067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Fine mapping placed the human CORT gene to chromosome 1p36.3→p36.2 near marker D1S244; the gene consists of two exons divided by a ~1 kb intron; two synonymous polymorphisms were detected in the coding region but no mutations were found in 49 primary neuroblastomas.\",\n      \"method\": \"Radiation hybrid mapping, BAC physical mapping, BAC sequencing, genomic sequencing of 49 tumor samples\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct genomic sequencing and physical mapping with multiple orthogonal approaches\",\n      \"pmids\": [\"10894940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Cortistatin (but not somatostatin) binds to growth hormone secretagogue receptors (GHS-R) in human pituitary membranes, competing with 125I-Tyr-Ala-hexarelin and ghrelin; CST-14 and ghrelin showed similar affinity (~5×10⁻⁷ mol/L) for GHS-R, whereas somatostatin fragments did not displace binding.\",\n      \"method\": \"Radioligand competition binding assay on human pituitary membranes using 125I-Tyr-Ala-hexarelin\",\n      \"journal\": \"Journal of endocrinological investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding assay on native human tissue, single lab but clear pharmacological distinction from somatostatin\",\n      \"pmids\": [\"11227737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In humans, intravenous cortistatin-14 inhibits basal and GHRH-stimulated GH secretion and insulin secretion to the same extent as somatostatin-14; unlike somatostatin, CST-14 also binds GHS-R and partially blunts ghrelin-induced GH release; neither CST-14 nor SST-14 modified PRL or ACTH responses to ghrelin.\",\n      \"method\": \"Randomized crossover clinical study in 6 normal adults; hormone measurements by RIA/IRMA during iv infusion of CST-14, SS-14, GHRH, and ghrelin\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — controlled human in vivo pharmacology, small n but rigorous crossover design\",\n      \"pmids\": [\"12161511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MrgX2 (MRGPRX2), an orphan G-protein-coupled receptor expressed in dorsal root ganglion, was identified as a high-potency receptor for cortistatin-14; cortistatin stimulated intracellular Ca²⁺ increases (Gq-coupled) but had no effect on cAMP in MrgX2-expressing cells; MrgX2 has a pharmacological profile distinct from other Mrg family members.\",\n      \"method\": \"Reverse pharmacology/expression cloning, calcium mobilization assay, cAMP assay, immunohistochemistry, quantitative PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — receptor identification with multiple functional readouts (Ca²⁺, cAMP) and expression profiling; foundational receptor identification paper\",\n      \"pmids\": [\"12915402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human monocytes, macrophages, and dendritic cells selectively express sst2 mRNA and cortistatin (CST) mRNA but not somatostatin mRNA; CST mRNA is upregulated during monocyte-to-macrophage/DC differentiation and by LPS stimulation; sst2 protein is present on macrophages but not dendritic cells; CST displaces [125I-Tyr3]octreotide from sst2-expressing cells, indicating CST acts as the endogenous sst2 ligand in immune cells rather than somatostatin.\",\n      \"method\": \"RT-PCR, quantitative RT-PCR, ELISA, confocal microscopy, autoradiography, radioligand binding competition\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including direct binding assay and protein-level confirmation\",\n      \"pmids\": [\"12684217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human lymphoid tissues and immune cells express CST mRNA (but not SS mRNA, except thymus); CST mRNA expression levels differ across tissues and immune cell types; CST is proposed as the endogenous ligand for sst2 in the human immune system; two differently sized CST cDNA fragments were detected, with T-cell lines expressing both and most B-cell lines expressing only the short fragment.\",\n      \"method\": \"RT-PCR, quantitative RT-PCR, autoradiography on thymic tissue, radioligand displacement assay\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods, single lab; binding evidence is indirect (displacement assay)\",\n      \"pmids\": [\"12519865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cortistatin mRNA and protein are present in human pancreatic islet cells (but not exocrine pancreas); islet cells expressing CST also express somatostatin receptors sst2, sst3, and sst5, as well as ghrelin and GHS receptors, suggesting local autocrine/paracrine cortistatin circuits in the endocrine pancreas.\",\n      \"method\": \"RT-PCR, in situ hybridization, immunohistochemistry with anti-CST-17 antibody\",\n      \"journal\": \"Journal of endocrinological investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — localization by multiple methods but no functional readout in pancreatic tissue\",\n      \"pmids\": [\"14669820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cortistatin is abundant in human vitreous fluid and significantly contributes to somatostatin-like immunoreactivity (SLI) in vitreous; intravitreous cortistatin levels were higher than plasma levels in both nondiabetic controls and diabetic patients with PDR.\",\n      \"method\": \"Radioimmunoassay with HPLC separation of vitreous and plasma samples from 22 diabetic PDR patients and 22 controls\",\n      \"journal\": \"Diabetes care\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct quantitative measurement in human clinical samples with HPLC/RIA; localization finding\",\n      \"pmids\": [\"16043736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Cortistatin is produced by the human retina (both neuroretina and RPE); CST mRNA levels are significantly lower in diabetic retinas compared to nondiabetic donors in both RPE and neuroretina; reduced CST expression is associated with increased GFAP (glial activation) and higher apoptosis (TUNEL-positive cells), establishing CST reduction as an early event in diabetic retinopathy.\",\n      \"method\": \"RT-PCR, confocal laser microscopy immunofluorescence, TUNEL assay in postmortem human eye tissue from 5 diabetic and 5 nondiabetic donors\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods in human tissue; associative but direct expression/localization data\",\n      \"pmids\": [\"18709137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Expression of cortistatin (CST) mRNA is reduced in multiple regions of the temporal lobe in Alzheimer's disease patients compared to controls, alongside reduction of somatostatin, somatostatin receptors (sst1-5), and dopamine receptors; neprilysin expression was not altered, suggesting that Aβ accumulation results from lack of SST/CST activation of neprilysin rather than reduced neprilysin expression.\",\n      \"method\": \"Quantitative real-time PCR on postmortem temporal lobe tissue from AD patients and age-matched controls\",\n      \"journal\": \"Journal of Alzheimer's disease : JAD\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — quantitative expression analysis in human tissue, single method, mechanistic inference\",\n      \"pmids\": [\"20164562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cortistatin inhibits platelet-derived growth factor (PDGF)-stimulated proliferation of human vascular smooth muscle cells (SMCs) via binding to somatostatin receptors (sst2 and sst5) and ghrelin receptor, with downstream induction of cAMP and p38-MAPK and inhibition of Akt; cortistatin also impairs lamellipodia formation and migration of SMCs toward PDGF by inhibiting Rac1 activation and cytosolic calcium increases in a ghrelin-receptor-dependent manner; cortistatin-deficient mice develop greater neointimal hyperplasia after carotid artery ligation.\",\n      \"method\": \"Cell proliferation assays, receptor binding (sst2/sst5/ghrelin-R), cAMP measurement, p38/Akt Western blot, Rac1 activity assay, calcium imaging, in vivo carotid ligation model in cortistatin-knockout mice\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal in vitro and in vivo methods, receptor-specific pharmacology, knockout validation\",\n      \"pmids\": [\"23595952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cortistatin-14 exerts anticonvulsant effects in a pilocarpine-induced seizure model in rats and mice; these anticonvulsant actions are mediated by sst2 and sst3 receptors (selective antagonists for each independently reverse the effect), but not by ghrelin receptors (ghrelin receptor knockout mice show comparable CST-14 anticonvulsant effect to wild-type).\",\n      \"method\": \"In vivo microdialysis, telemetry-based EEG recording, pharmacological antagonism with selective sst2 antagonist (cyanamid15486) and sst3 antagonist (SST3-ODN-8), ghrelin receptor knockout mice\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic and pharmacological epistasis with multiple receptor-selective tools and knockout model\",\n      \"pmids\": [\"24685142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cortistatin competitively binds to TNF-α receptors TNFR1 and TNFR2 (demonstrated by co-immunoprecipitation and biotin-based solid-phase binding assay), suppresses pro-inflammatory TNF-α function, inhibits NF-κB signaling in chondrocytes, and attenuates osteoarthritis development in vivo; CST-deficient mice show accelerated OA-like phenotype and TNFR1/TNFR2 knockout mice show reduced protective effect of CST.\",\n      \"method\": \"Co-immunoprecipitation, biotin-based solid-phase binding assay, Western blot, RT-PCR, ELISA, immunofluorescence, NF-κB pathway analysis, surgically-induced and spontaneous OA mouse models, TNFR knockout mice, flow cytometry\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding demonstrated by two methods, multiple in vitro and in vivo approaches including receptor-specific knockouts\",\n      \"pmids\": [\"30826358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cortistatin expression in nucleus pulposus (NP) cells is reduced during aging and TNF-α-induced intervertebral disc degeneration; CST-knockout mice show accelerated metabolic imbalance, enhanced apoptosis, and disorganized NP tissue; exogenous CST inhibits mitochondrial dysfunction and suppresses NLRP3 inflammasome activation through mitochondrial ROS-dependent mechanisms; increased NF-κB pathway activity was associated with IVD degeneration in CST-/- mice.\",\n      \"method\": \"NP tissue/cell isolation from patients and mice, CST-knockout mouse model, TNF-α stimulation, mitochondrial ROS measurement, NLRP3 inflammasome activity assay, NF-κB pathway analysis, Western blot, immunohistochemistry, in vitro and ex vivo experiments\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — knockout validation combined with mechanistic pathway analysis and multiple orthogonal methods\",\n      \"pmids\": [\"32550919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of MRGPRX2-Gi1 complex bound to cortistatin-14 were resolved; cortistatin-14 occupies a shallow, solvent-exposed ligand-binding pocket; MRGPRX2 shows an unusual kink at TM6 and replacement of the general toggle switch Trp6.48 with Gly6.48, suggesting a distinct activation mechanism; the receptor couples to both Gi and Gq in mast cells.\",\n      \"method\": \"Cryo-electron microscopy structure determination, functional validation (Gi/Gq coupling), antagonist probe development\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic-resolution cryo-EM structure with functional validation; replicated across two concurrent Nature papers\",\n      \"pmids\": [\"34789874\", \"34789875\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Cortistatin (encoded by CORT) is a neuropeptide processed from preprocortistatin (primarily to CST-14 via regulated secretory pathway) that signals through all five somatostatin receptors (sharing the sst2 system with somatostatin in immune cells where it is the predominant endogenous ligand), the ghrelin/GHS receptor, and MRGPRX2 (a Gq/Gi-coupled receptor in dorsal root ganglion and mast cells whose cryo-EM structure with cortistatin-14 has been resolved); cortistatin additionally binds directly to TNF-α receptors (TNFR1/TNFR2) to suppress NF-κB-dependent inflammation, inhibits vascular smooth muscle cell proliferation and migration via sst2/sst5/ghrelin-R signaling, exerts anticonvulsant effects via sst2 and sst3, suppresses NLRP3 inflammasome activation through mitochondrial ROS inhibition, and is expressed in cortical GABAergic interneurons, retina, pancreatic islets, and immune cells where its reduction is linked to diabetic retinopathy, Alzheimer's disease, and intervertebral disc degeneration.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CORT encodes preprocortistatin, a neuropeptide precursor processed into cortistatin-14/17, which binds all five somatostatin receptor subtypes (sst1–sst5) [PMID:10894940]. Cortistatin-14 exerts anticonvulsant activity in vivo through sst2 and sst3 receptors, as demonstrated by pharmacological antagonism, while ghrelin receptors are dispensable for this effect [PMID:24685142].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing the genomic architecture of human CORT resolved the gene's chromosomal location and two-exon structure, enabling subsequent functional studies on its peptide products.\",\n      \"evidence\": \"Radiation hybrid mapping, BAC physical mapping, and genomic sequencing in human cells\",\n      \"pmids\": [\"10894940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No functional characterization of the encoded peptide was performed in this study\",\n        \"Polymorphic variants identified but phenotypic consequences not tested\",\n        \"Expression detected in neuroblastomas but signaling mechanism unknown\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying sst2 and sst3 as the receptors mediating cortistatin-14's anticonvulsant effect — and excluding ghrelin receptors — resolved which signaling pathway underlies its seizure-suppressive activity.\",\n      \"evidence\": \"In vivo microdialysis and EEG in a pilocarpine seizure model using selective sst2/sst3 antagonists and ghrelin receptor knockout mice\",\n      \"pmids\": [\"24685142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single study; independent replication in additional seizure models not yet reported\",\n        \"Downstream intracellular signaling cascade linking sst2/sst3 activation to seizure suppression not characterized\",\n        \"Relative contributions of sst2 versus sst3 not quantitatively dissected\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The cell-biological mechanisms by which cortistatin regulates pancreatic islet function and insulin secretion, and its non-redundant roles relative to somatostatin signaling through the same receptor subtypes, remain uncharacterized by direct experimental evidence.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct experimental evidence distinguishing cortistatin from somatostatin signaling at shared receptors\",\n        \"No structural model of cortistatin–receptor interaction\",\n        \"In vivo phenotype of CORT loss-of-function in metabolic or neuronal contexts not established\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, let me fix the pathway term_id. The correct Reactome ID should be `R-HSA-162582`.\n\n```json\n{\n  \"mechanistic_narrative\": \"CORT encodes preprocortistatin, a neuropeptide precursor processed into cortistatin-14/17, which binds all five somatostatin receptor subtypes (sst1–sst5) [PMID:10894940]. Cortistatin-14 exerts anticonvulsant activity in vivo through sst2 and sst3 receptors, as demonstrated by pharmacological antagonism, while ghrelin receptors are dispensable for this effect [PMID:24685142].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing the genomic architecture of human CORT resolved the gene's chromosomal location and two-exon structure, enabling subsequent functional studies on its peptide products.\",\n      \"evidence\": \"Radiation hybrid mapping, BAC physical mapping, and genomic sequencing in human cells\",\n      \"pmids\": [\"10894940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No functional characterization of the encoded peptide was performed in this study\",\n        \"Polymorphic variants identified but phenotypic consequences not tested\",\n        \"Expression detected in neuroblastomas but signaling mechanism unknown\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying sst2 and sst3 as the receptors mediating cortistatin-14's anticonvulsant effect — and excluding ghrelin receptors — resolved which signaling pathway underlies its seizure-suppressive activity.\",\n      \"evidence\": \"In vivo microdialysis and EEG in a pilocarpine seizure model using selective sst2/sst3 antagonists and ghrelin receptor knockout mice\",\n      \"pmids\": [\"24685142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single study; independent replication in additional seizure models not yet reported\",\n        \"Downstream intracellular signaling cascade linking sst2/sst3 activation to seizure suppression not characterized\",\n        \"Relative contributions of sst2 versus sst3 not quantitatively dissected\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The cell-biological mechanisms by which cortistatin regulates pancreatic islet function and insulin secretion, and its non-redundant roles relative to somatostatin signaling through the same receptor subtypes, remain uncharacterized by direct experimental evidence.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct experimental evidence distinguishing cortistatin from somatostatin signaling at shared receptors\",\n        \"No structural model of cortistatin–receptor interaction\",\n        \"In vivo phenotype of CORT loss-of-function in metabolic or neuronal contexts not established\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Cortistatin is a neuropeptide derived from preprocortistatin (primarily processed to CST-14 via the regulated secretory pathway) that functions as a pleiotropic anti-inflammatory and neuromodulatory signaling molecule, acting through somatostatin receptors (sst1–sst5), the ghrelin/GHS receptor, MRGPRX2, and TNF-α receptors (TNFR1/TNFR2) [PMID:9125122, PMID:12915402, PMID:30826358]. In the nervous system, cortistatin is expressed in cortical GABAergic interneurons, enhances slow-wave sleep by antagonizing cholinergic cortical excitation, and exerts anticonvulsant effects mediated specifically through sst2 and sst3 [PMID:9205124, PMID:24685142]. In the immune system, cortistatin—rather than somatostatin—serves as the predominant endogenous sst2 ligand in monocytes, macrophages, and dendritic cells, and additionally suppresses NF-κB-dependent inflammation by competing with TNF-α for TNFR1/TNFR2 binding and by inhibiting NLRP3 inflammasome activation through blockade of mitochondrial ROS [PMID:12684217, PMID:30826358, PMID:32550919]. Cortistatin also inhibits vascular smooth muscle cell proliferation and migration via sst2/sst5 and ghrelin receptor signaling, with cortistatin-deficient mice developing exaggerated neointimal hyperplasia [PMID:23595952].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Cloning of human preprocortistatin revealed a new neuropeptide that shares all five somatostatin receptors yet produces distinct neurophysiological effects (cortical EEG flattening), establishing cortistatin as a somatostatin-related but functionally distinct signaling molecule.\",\n      \"evidence\": \"cDNA cloning from human fetal brain, radioligand binding at five SSTRs, cAMP inhibition assays, and in vivo rat EEG recording; parallel mouse/human gene cloning with in situ hybridization localizing expression to cortical/hippocampal GABAergic interneurons\",\n      \"pmids\": [\"9125122\", \"9205124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No cortistatin-specific receptor identified at this stage\", \"Mature peptide form(s) generated in vivo not yet resolved\", \"Peripheral expression and function unexplored\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Reconstitution of preprocortistatin processing in neuroendocrine cells demonstrated that CST-14 is the predominant mature cleavage product released via the regulated secretory pathway, resolving the identity of the bioactive peptide.\",\n      \"evidence\": \"Stable transfection of AtT-20 cells with rat preprocortistatin, HPLC separation and RIA quantification of secreted products\",\n      \"pmids\": [\"10461921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Processing in non-neuroendocrine tissues unknown\", \"Convertase(s) responsible for cleavage not identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of cortistatin—but not somatostatin—as a ligand for the growth hormone secretagogue receptor (GHS-R) established the first receptor pharmacology distinguishing cortistatin from somatostatin.\",\n      \"evidence\": \"Radioligand competition binding on human pituitary membranes; confirmed in vivo by clinical crossover study showing CST-14 blunts ghrelin-induced GH release\",\n      \"pmids\": [\"11227737\", \"12161511\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of GHS-R engagement in non-pituitary tissues not determined\", \"Small clinical cohort (n=6)\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Discovery that immune cells express cortistatin (but not somatostatin) alongside sst2 redefined cortistatin as the endogenous sst2 ligand in the immune system, while identification of MRGPRX2 as a cortistatin-specific Gq-coupled receptor in sensory neurons revealed a second non-somatostatin receptor.\",\n      \"evidence\": \"RT-PCR, radioligand displacement, and confocal microscopy in human monocytes/macrophages/DCs; reverse pharmacology with Ca²⁺ mobilization and cAMP assays in MRGPRX2-expressing cells; expression profiling in DRG neurons\",\n      \"pmids\": [\"12684217\", \"12519865\", \"12915402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling cascades in immune cells not characterized\", \"MRGPRX2 function in mast cells not yet addressed\", \"Relative contributions of sst2 vs. MRGPRX2 signaling unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Localization of cortistatin mRNA and protein in human pancreatic islets and retinal tissue expanded the known sites of cortistatin action beyond the CNS, with subsequent clinical data revealing reduced CST expression in diabetic retinopathy.\",\n      \"evidence\": \"RT-PCR, in situ hybridization, and immunohistochemistry in human pancreatic islets; RIA/HPLC of vitreous fluid; immunofluorescence and TUNEL assays in postmortem diabetic vs. nondiabetic retinal tissue\",\n      \"pmids\": [\"14669820\", \"16043736\", \"18709137\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of cortistatin in islet hormone regulation not demonstrated by intervention\", \"Whether CST reduction is causal in diabetic retinopathy or a consequence of disease\", \"Retinal receptor mediating CST effects unidentified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mechanistic dissection in vascular smooth muscle cells showed that cortistatin inhibits PDGF-driven proliferation and migration through sst2, sst5, and ghrelin receptor signaling (via cAMP/p38 induction, Akt inhibition, and Rac1 suppression), with cortistatin-knockout mice validating the vascular protective role in vivo.\",\n      \"evidence\": \"Receptor-selective pharmacology, proliferation/migration assays, Rac1/Akt/p38 biochemistry, calcium imaging, and carotid artery ligation model in CST-knockout mice\",\n      \"pmids\": [\"23595952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CST acts in an autocrine or paracrine fashion in vasculature unknown\", \"Contribution of each receptor subtype to in vivo neointima prevention not individually resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Pharmacological and genetic epistasis experiments established that cortistatin's anticonvulsant activity is mediated by sst2 and sst3 (each independently necessary) and is independent of the ghrelin receptor, refining the receptor logic underlying cortistatin's neuronal functions.\",\n      \"evidence\": \"In vivo pilocarpine-induced seizure model with selective sst2 and sst3 antagonists, ghrelin receptor knockout mice, EEG telemetry\",\n      \"pmids\": [\"24685142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream intracellular pathways mediating anticonvulsant effect unexplored\", \"Whether cortistatin affects seizure circuits via inhibitory interneurons or direct postsynaptic action unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of direct cortistatin binding to TNFR1 and TNFR2 revealed a receptor interaction independent of the somatostatin/ghrelin receptor families, providing a mechanism for cortistatin's anti-inflammatory effects through competitive suppression of TNF-α/NF-κB signaling.\",\n      \"evidence\": \"Co-immunoprecipitation and biotin-based solid-phase binding assay, NF-κB pathway analysis, surgically-induced OA in CST-knockout and TNFR-knockout mice\",\n      \"pmids\": [\"30826358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CST–TNFR interaction unresolved\", \"Whether CST–TNFR binding occurs in all TNF-responsive tissues or is context-restricted\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Studies in CST-knockout mice and human disc tissue demonstrated that cortistatin suppresses NLRP3 inflammasome activation via inhibition of mitochondrial ROS, establishing a new effector arm of cortistatin's anti-inflammatory mechanism distinct from NF-κB blockade.\",\n      \"evidence\": \"CST-knockout mouse intervertebral disc degeneration model, TNF-α stimulation of nucleus pulposus cells, mitochondrial ROS measurement, NLRP3 inflammasome activity assays\",\n      \"pmids\": [\"32550919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor(s) mediating mitochondrial ROS inhibition in NP cells not identified\", \"Whether NLRP3 suppression is a general cortistatin function or tissue-specific\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cryo-EM resolution of the MRGPRX2–Gi1 complex bound to cortistatin-14 provided the first atomic-level view of cortistatin receptor engagement, revealing a shallow binding pocket and an unconventional activation mechanism involving Gly6.48 replacement of the canonical toggle switch.\",\n      \"evidence\": \"Cryo-electron microscopy structure determination with functional Gi/Gq coupling validation\",\n      \"pmids\": [\"34789874\", \"34789875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of cortistatin bound to any somatostatin receptor or TNFR\", \"MRGPRX2 signaling downstream of Gq/Gi in mast cell degranulation not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of cortistatin engagement with somatostatin receptors and TNFRs, the identity of receptor(s) mediating cortistatin's metabolic effects in pancreatic islets, whether cortistatin reduction in Alzheimer's disease and diabetic retinopathy is causally pathogenic, and the relative signaling contributions of each receptor in different tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural data for CST at any somatostatin receptor\", \"Causal role of CST loss in neurodegeneration unproven\", \"Tissue-specific receptor hierarchy for CST signaling unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 5, 7, 14, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 16, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2, 6, 11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 7, 14, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 9, 16, 17]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 3, 15]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SSTR1\",\n      \"SSTR2\",\n      \"SSTR3\",\n      \"SSTR5\",\n      \"GHSR\",\n      \"MRGPRX2\",\n      \"TNFRSF1A\",\n      \"TNFRSF1B\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}