{"gene":"PROK2","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1999,"finding":"Bv8 (the amphibian homolog of PROK2) stimulates contraction of the guinea-pig ileum at nanomolar concentrations and induces hyperalgesia when injected intracerebroventricularly in rats, as assessed by tail-flick and paw pressure threshold tests.","method":"In vivo pharmacological injection; guinea-pig ileum contraction assay","journal":"European journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional bioassay in vivo and ex vivo with dose-response, single lab, two orthogonal readouts","pmids":["10422759"],"is_preprint":false},{"year":1999,"finding":"The mammalian homologs of Bv8 (PROK2) are predominantly expressed in mid-late pachytene spermatocytes of the mouse testis, with two alternative mRNA splice forms identified, one encoding a basic-amino-acid-rich domain.","method":"cDNA cloning, in situ hybridization, Northern blot","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — molecular cloning and expression localization, single lab, replicated across splice variant analysis","pmids":["10580115"],"is_preprint":false},{"year":2001,"finding":"PROK2 (mBv8) promotes survival of cerebellar granule cells and cortical neurons against apoptotic and excitotoxic death by activating both the MAPK (p44/p42) and PI-3-kinase/Akt pathways, as demonstrated by Western blot phosphorylation analysis and pharmacological inhibition with PD98059 and LY294002.","method":"Primary neuron culture survival assay; Western blot for phospho-MAPK and phospho-Akt; pharmacological pathway inhibition","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro functional assay with two orthogonal pharmacological inhibitors and biochemical pathway readout, single lab","pmids":["11359521"],"is_preprint":false},{"year":2002,"finding":"PROK2/Bv8 binds PK-R1 and PK-R2 receptors in rat dorsal root ganglia (DRG) and dorsal spinal cord with high affinity (IC50 ~4–7 nM), raises [Ca2+]i in small-diameter DRG neurons, and produces intense systemic nociceptive sensitization to mechanical and thermal stimuli via peripheral and spinal mechanisms.","method":"Radioligand binding assay ([125I]-Bv8); intracellular calcium imaging; in vivo behavioral pharmacology (tail-flick, paw pressure)","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — receptor binding quantified with radioligand, calcium mobilization confirmed, in vivo behavioral readout, multiple orthogonal methods, independently replicated across labs","pmids":["12466223"],"is_preprint":false},{"year":2003,"finding":"PROK2/Bv8 induces proliferation, survival, and migration of adrenal cortical capillary endothelial cells, and adenoviral delivery to mouse testis produces a potent angiogenic response; Bv8/EG-VEGF receptors are localized to vascular endothelial cells within the testis.","method":"Endothelial cell proliferation/survival/migration assays; adenoviral gene delivery in vivo; receptor immunolocalization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays (proliferation, survival, migration, in vivo angiogenesis) with receptor localization, replicated across related studies","pmids":["12604792"],"is_preprint":false},{"year":2004,"finding":"PROK2/Bv8 promotes survival and differentiation of granulocytic and monocytic lineages from hematopoietic stem cells, stimulates monocyte migration in a pertussis-toxin-sensitive manner, and systemic exposure increases total leukocyte, neutrophil, and monocyte counts in vivo; its G-protein-coupled receptors are expressed on hematopoietic stem cells.","method":"Colony-forming unit assay (CFU-G, CFU-M); in vivo adenoviral Bv8 delivery; leukocyte counts; migration assay with pertussis toxin inhibition","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple functional assays in vitro and in vivo with pharmacological dissection, replicated by same and other labs","pmids":["15548611"],"is_preprint":false},{"year":2006,"finding":"PROK2/Bv8 sensitizes TRPV1 in dorsal root ganglion nociceptors through activation of PKCε, causing translocation of PKCε to the neuronal membrane and enhancing TRPV1-mediated inward current; PKC antagonists reduce both TRPV1 current enhancement and behavioral hyperalgesia.","method":"Patch-clamp electrophysiology; PKCε translocation imaging; behavioral hyperalgesia assay; single-cell RT-PCR for PKR mRNA; GDNF-induced receptor expression","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — electrophysiology with pharmacological dissection, kinase translocation imaging, behavioral readout, multiple orthogonal methods in one study","pmids":["16687502"],"is_preprint":false},{"year":2006,"finding":"PROK2/Bv8 induces potent chemotaxis of macrophages and a proinflammatory phenotype (increased IL-1, IL-12; decreased IL-10); these effects are not pertussis-toxin sensitive but are blocked by the phospholipase inhibitor U73122 (suggesting Gq coupling) and are absent in PKR-1 knockout mice, demonstrating PKR-1 as the mediating receptor.","method":"Macrophage chemotaxis assay; cytokine ELISA; pertussis toxin and U73122 pharmacological inhibition; PKR-1 knockout mice","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout plus pharmacological dissection confirming receptor identity and G-protein subtype, multiple orthogonal readouts","pmids":["16299550"],"is_preprint":false},{"year":2007,"finding":"Bv8 (PROK2) is upregulated in CD11b+Gr1+ myeloid cells upon tumor implantation; G-CSF is identified as a major positive regulator of Bv8 expression; adenoviral Bv8 delivery to tumors promotes angiogenesis; anti-Bv8 antibodies reduce CD11b+Gr1+ cell mobilization and inhibit tumor angiogenesis and growth.","method":"Adenoviral gene delivery in vivo; anti-Bv8 neutralizing antibody treatment; FACS for CD11b+Gr1+ cells; tumor growth and vascular density measurements","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo functional gain- and loss-of-function experiments, multiple tumor models, replicated by independent groups","pmids":["18064003"],"is_preprint":false},{"year":2007,"finding":"Intra-PAG injection of Bv8 increases GABA (but not glutamate) extracellular levels in the periaqueductal grey as measured by microdialysis, activates RVM On-cells and suppresses Off-cells, and decreases tail-flick latency, establishing a pronociceptive role via GABAergic signaling in the descending pain pathway.","method":"In vivo microdialysis; RVM electrophysiology (On/Off cell recording); tail-flick behavioral test","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo microdialysis and electrophysiology with behavioral correlation, single lab","pmids":["18005070"],"is_preprint":false},{"year":2008,"finding":"Bv8 (PROK2) decreases IL-4 and IL-10 production by mouse splenocytes while increasing IL-1β, shifting T cells toward a Th1 profile; this effect is absent in PROKR1 knockout mice, demonstrating PKR-1 as the sole mediating receptor for lymphocyte cytokine modulation.","method":"Cytokine ELISA in splenocyte culture; in vivo immunization; PROKR1 knockout mice","journal":"BMC immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout confirms receptor specificity, in vitro and in vivo concordant results, single lab","pmids":["18957080"],"is_preprint":false},{"year":2008,"finding":"Anti-Bv8 treatment in RIP-Tag transgenic mice significantly reduces angiogenic switching in early pancreatic neoplasia and inhibits CD11b+Gr1+ cell mobilization and homing, with stage-dependent efficacy paralleling neutrophil ablation, implicating PROK2 as a mediator of neutrophil-dependent angiogenesis.","method":"In vivo anti-Bv8 antibody treatment in transgenic tumor model; histological vascular surface area measurement; FACS for CD11b+Gr1+ cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — endogenous transgenic model, quantitative histology and cell counting, replicated concept from Shojaei et al. 2007","pmids":["18268320"],"is_preprint":false},{"year":2009,"finding":"Granulocyte-derived PROK2 (GrPK2) purified from peritoneal granulocytes binds prokineticin receptors with high affinity and induces hypernociception; PKR1 and PKR2 knockout mice show significantly less inflammation-induced hyperalgesia, and PKR1 knockout reduces inflammation-induced PK2 upregulation, establishing PKR1 as a regulator of PK2 levels during inflammation.","method":"Protein purification from peritoneal granulocytes; PKR1/PKR2 knockout mice; CFA paw inflammation model; PKR antagonist dose-response behavioral assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — purified endogenous protein, dual-receptor knockout, pharmacological antagonism, replicated across labs","pmids":["19667192"],"is_preprint":false},{"year":2012,"finding":"G-CSF induces Bv8/PROK2 expression in CD11b+Gr1+ myeloid cells via STAT3 activation; STAT3 inhibition or siRNA knockdown reduces G-CSF-induced Bv8 expression; chromatin immunoprecipitation demonstrates phospho-STAT3 binding to the Bv8 promoter; luciferase assay confirms this binding site as a functional transcriptional enhancer.","method":"siRNA knockdown; pharmacological STAT3 inhibition (WP1066); chromatin immunoprecipitation (ChIP); luciferase reporter assay; in vivo validation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ChIP plus luciferase reporter plus genetic knockdown, multiple orthogonal methods confirming STAT3 as direct transcriptional activator of PROK2","pmids":["22528488"],"is_preprint":false},{"year":2012,"finding":"Bv8 induces biphasic hyperalgesia: the early phase involves direct CGRP release from spinal cord tissue, while the late phase requires de novo protein synthesis and is associated with upregulation of CGRP and substance P immunoreactivity in dorsal horn and DRG; protein synthesis inhibitors block only the late phase.","method":"Ex vivo spinal cord CGRP release assay; in vivo protein synthesis inhibitor pretreatment; CGRP/substance P immunohistochemistry","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ex vivo biochemical assay combined with in vivo pharmacological dissection, single lab","pmids":["22641053"],"is_preprint":false},{"year":2013,"finding":"BV8/PROK2 activates STAT3 in myeloid cells via JAK2; JAK2 genetic and pharmacological inhibition abrogates BV8-induced STAT3 activation; BV8 shRNA knockdown in human myeloid leukemia cells reduces STAT3 activity and downstream angiogenic/proliferative gene expression, decreasing tumor cell viability and in vivo tumor growth.","method":"JAK2 genetic knockdown and pharmacological inhibition; BV8 shRNA; STAT3 phosphorylation Western blot; in vivo xenograft tumor growth","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and pharmacological pathway dissection, in vitro and in vivo concordant results, confirms JAK2 as required kinase for BV8→STAT3 signaling","pmids":["23548897"],"is_preprint":false},{"year":2005,"finding":"Deletion of the N-terminal alanine of Bv8 (des-Ala-Bv8) reduces receptor affinity and potency fivefold at both PKR1 and PKR2 and reduces hyperalgesic potency ~20-fold; deletion of the first two residues (des-Ala-Val-Bv8) abolishes all biological activity in vitro and in vivo but enables partial antagonism of Bv8-induced hyperalgesia, demonstrating that the N-terminal hexapeptide AVITGA is essential for receptor activation.","method":"Radioligand binding; intracellular Ca2+ mobilization; MAPK phosphorylation in CHO cells expressing PKR1/PKR2; in vivo hyperalgesia assay","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure-activity relationship with multiple N-terminal deletion mutants, in vitro receptor assays and in vivo behavioral validation","pmids":["16113687"],"is_preprint":false},{"year":2010,"finding":"Chemical synthesis and NMR structure determination of Bv8 (77 residues, five disulfide bonds) revealed it is structurally homologous to mamba intestinal toxin 1; a truncated mutant lacking five N-terminal residues shows no perturbation to the core structure yet loses receptor binding activity, indicating receptor interaction is highly cooperative and likely involves the N-terminal region without global structural rearrangement.","method":"Chemical synthesis (Boc SPPS + native chemical ligation); NMR structure determination; in vitro functional assay in neuroblastoma cells and DRG neurons","journal":"Chembiochem","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional validation of N-terminal deletion mutant, single lab but rigorous multi-method approach","pmids":["20677202"],"is_preprint":false},{"year":2010,"finding":"Tryptophan at position 24 of Bv8/PROK2 is important for PKR interaction; W24A substitution reduces receptor binding affinity and biological activity, as demonstrated by recombinant protein production in Pichia pastoris and receptor binding assays.","method":"Site-directed mutagenesis (W24A); recombinant protein expression in Pichia pastoris; PKR binding assay","journal":"Protein expression and purification","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — mutagenesis with functional readout, single lab, single method","pmids":["20412858"],"is_preprint":false},{"year":2012,"finding":"A W24A Bv8 analog (A-24) preferentially binds PKR2 over PKR1 with lower potency; at inactive doses it antagonizes Bv8-induced hyperalgesia; systemically it increases β-endorphin levels in mouse brain and shows anti-hyperalgesic activity in inflammatory and post-surgical pain models by blocking peripheral PKR1 and activating central opioid pathways via PKR2.","method":"Receptor binding assay; in vivo hyperalgesia models (inflammatory, post-surgical); β-endorphin radioimmunoassay","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor-selective analog with in vitro and in vivo functional dissection, single lab","pmids":["22122547"],"is_preprint":false},{"year":2014,"finding":"PROK2 and PKR2 are upregulated in nociceptors, Schwann cells, and activated astrocytes of the spinal cord after chronic constriction injury; systemic PKR antagonist treatment reduces neuropathic hyperalgesia and allodynia, blunts microgliosis and astrocyte activation, and restores cytokine balance, establishing PROK2/PKR2 signaling as a contributor to neuropathic pain via neuron-glia interaction.","method":"CCI neuropathic pain model; intrathecal, perineural, and subcutaneous PKR antagonist (PC1) injection; immunohistochemistry for PROK2/PKR2/glia markers; cytokine measurement","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with pharmacological antagonist, immunohistochemical localization, cytokine readout, single lab","pmids":["24902717"],"is_preprint":false},{"year":2016,"finding":"Peripheral cutaneous application of Bv8 at nanomolar concentrations directly sensitizes unmyelinated polymodal C-fibers to heat (increased heat-evoked discharge, lower threshold), and increases heat- and capsaicin-evoked CGRP release from hind-paw skin, confirming peripheral nociceptor sensitization as the mechanism for the first phase of Bv8-induced thermal hyperalgesia.","method":"Single cutaneous fiber electrophysiology; skin-nerve preparation; CGRP release assay from hind-paw skin flaps; immunohistochemistry","journal":"European journal of pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiological recording from single fibers with CGRP biochemical confirmation, single lab","pmids":["26914965"],"is_preprint":false},{"year":2019,"finding":"PROK2/PROKR2 signaling is required for tangential and radial migration of olfactory bulb interneurons through the SVZ-RMS-OB pathway; Prok2 and Prokr2 mutant mice show ~75% loss of GABAergic interneurons in the olfactory bulb; PROKR2 is expressed in postmitotic immature interneurons, while PROK2 is expressed in a subset of mature OB granule and tufted cells but not in SVZ progenitors.","method":"Prok2EGFP transgenic and Prokr2LacZ/+ knockin mice; immunohistochemistry; cell counting in mutant vs. wildtype OB","journal":"The Journal of comparative neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockin/transgenic reporter lines with knockout phenotype, quantitative cell-type-specific localization, well-controlled","pmids":["31132148"],"is_preprint":false},{"year":2022,"finding":"The anorexigenic effect of PK2/PROK2 is mediated specifically by PKR2 neurons in the amygdala (not hypothalamus); targeted PKR2 silencing in the amygdala abolishes PK2-induced food intake reduction; chemogenetic activation of amygdala PKR2 neurons suppresses feeding; MRAP2 expression in PKR2 neurons modulates PK2 anorexigenic activity.","method":"Targeted PKR2 silencing (viral); chemogenetic (DREADD) manipulation of amygdala PKR2 neurons; food intake measurement; MRAP2 overexpression/knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — region-specific genetic silencing combined with chemogenetics, multiple approaches converging on same conclusion","pmids":["36539034"],"is_preprint":false},{"year":2008,"finding":"TTX-sensitive local electrophysiological activity in the suprachiasmatic nucleus (SCN) is required for full expression of PK2 circadian mRNA rhythm; TTX application substantially dampened the PK2 mRNA rhythm while leaving core clock gene rhythms (Per1, Per2, Bmal1, Cry1) intact, placing PK2 downstream of clock-driven neural activity rather than directly in the core oscillator.","method":"SCN slice culture; TTX pharmacological treatment; in situ hybridization for 13 genes including PK2 at 4-h intervals","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis in cultured SCN slices with multi-gene parallel readout, single lab","pmids":["18279366"],"is_preprint":false},{"year":2020,"finding":"PK2/PROK2 signals through PKR1/PKR2 to activate the AKT/GSK3β pathway in cardiomyocytes; PK2 attenuates high glucose/palmitic acid-induced ROS, apoptosis, and autophagosome accumulation in H9c2 cells; an AKT inhibitor abolishes PK2 protective effects, and AKT-knockout cardiomyocytes are unresponsive to PK2, establishing AKT as the required effector.","method":"AKT1/2 kinase inhibitor; AKT-knockout mouse cardiomyocytes; Western blot for p-AKT/p-GSK3β; ROS detection (DCFH-DA); flow cytometry for apoptosis; PKRA7 antagonist","journal":"Frontiers in physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic (AKT KO) and pharmacological (inhibitor + antagonist) orthogonal approaches, single lab","pmids":["32508669"],"is_preprint":false},{"year":2022,"finding":"miR-23a and miR-23b directly bind the 3′ UTR of PROK2 mRNA and downregulate PROK2 expression; overexpression of miR-23a/b mimics reduces hypoxia-induced GC-2 spermatocyte apoptosis in vitro, identifying PROK2 as a direct miR-23a/b target mediating lycopene's protective effect in varicocele.","method":"miRNA mimic transfection; luciferase reporter (implied by 'directly bind'); Western blot for PROK2; flow cytometry for apoptosis; miR-seq in vivo","journal":"Reproduction, fertility, and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — miRNA target validation with functional rescue, single lab","pmids":["38301353"],"is_preprint":false}],"current_model":"PROK2 (prokineticin 2/Bv8) is a secreted ~8 kDa protein with a conserved N-terminal AVITGA motif and five disulfide bonds that signals through two GPCRs (PROKR1 and PROKR2) coupled to Gq and JAK2/STAT3 pathways; it acts as a hematopoietic and myeloid-cell mobilizing factor regulated transcriptionally by G-CSF via STAT3, promotes tissue-selective angiogenesis by stimulating endothelial cell proliferation/survival/migration, drives inflammatory and neuropathic pain by sensitizing peripheral TRPV1-expressing nociceptors through PKCε activation and increasing excitatory neurotransmitter release in spinal circuits, supports neuronal survival via MAPK/PI3K-Akt pathways, is required for olfactory bulb interneuron migration via PROKR2, mediates food intake suppression via amygdala PKR2 neurons, and has its circadian expression in the SCN maintained downstream of sodium-channel-dependent neural activity."},"narrative":{"mechanistic_narrative":"PROK2 (prokineticin 2/Bv8) is a small secreted signaling protein with a conserved N-terminal AVITGA hexapeptide and five disulfide bonds that acts through the GPCRs PROKR1 and PROKR2 to coordinate nociception, myeloid/hematopoietic mobilization, angiogenesis, and CNS circuit development [PMID:12466223, PMID:16113687, PMID:20677202]. Structure-activity work establishes that receptor activation depends critically on the N-terminus: deletion of the first residues abolishes activity and yields a partial antagonist, while the core disulfide-stabilized fold (homologous to mamba intestinal toxin 1) is dispensable for binding, indicating a cooperative N-terminal interaction with the receptor [PMID:16113687, PMID:20677202]. In the somatosensory system PROK2 drives nociceptive sensitization by binding PKR1/PKR2 on small-diameter DRG neurons, raising intracellular Ca2+ and sensitizing TRPV1 through PKCε translocation, and by acting peripherally on polymodal C-fibers and centrally in the spinal cord and descending PAG/RVM circuitry to release CGRP, substance P, and GABA [PMID:12466223, PMID:16687502, PMID:18005070, PMID:22641053, PMID:26914965]; this pathway contributes to inflammatory and neuropathic pain involving neuron–glia interaction [PMID:19667192, PMID:24902717]. As a myeloid effector, PROK2 is induced in CD11b+Gr1+ cells by G-CSF via direct STAT3 binding to its promoter, mobilizes neutrophils and monocytes, and promotes tumor angiogenesis; PROK2 in turn signals through JAK2 to activate STAT3 in myeloid cells, and it stimulates endothelial cell proliferation, survival, and migration to drive tissue-selective angiogenesis [PMID:15548611, PMID:18064003, PMID:18268320, PMID:22528488, PMID:23548897, PMID:12604792]. PROK2 also supports neuronal survival via MAPK and PI3K/Akt pathways [PMID:11359521], is required via PROKR2 for migration of olfactory bulb GABAergic interneurons [PMID:31132148], mediates anorexigenic signaling through amygdala PKR2 neurons [PMID:36539034], and its circadian expression in the SCN is maintained downstream of TTX-sensitive neural activity rather than in the core oscillator [PMID:18279366].","teleology":[{"year":1999,"claim":"Established that the Bv8/prokineticin peptide is a bioactive signaling molecule capable of smooth-muscle contraction and central nociceptive modulation, defining its core pharmacology before receptors were known.","evidence":"In vivo icv injection and guinea-pig ileum contraction bioassay","pmids":["10422759"],"confidence":"Medium","gaps":["No receptor identified","Mammalian ortholog function not yet addressed"]},{"year":1999,"claim":"Identified the mammalian PROK2 gene and its restricted testicular expression with alternative splice forms, providing the molecular entity behind the amphibian bioactivity.","evidence":"cDNA cloning, in situ hybridization, Northern blot in mouse testis","pmids":["10580115"],"confidence":"Medium","gaps":["Functional role of splice variants unresolved","No receptor or signaling pathway defined"]},{"year":2001,"claim":"Showed PROK2 promotes neuronal survival, extending its role beyond contraction/pain to trophic signaling via MAPK and PI3K/Akt.","evidence":"Primary neuron survival assays with PD98059/LY294002 inhibition and phospho-Western blots","pmids":["11359521"],"confidence":"Medium","gaps":["Receptor identity not established in this system","In vivo relevance not tested"]},{"year":2002,"claim":"Defined high-affinity binding to PKR1/PKR2 and Ca2+ mobilization in DRG neurons as the mechanism linking PROK2 to systemic nociceptive sensitization.","evidence":"Radioligand binding, calcium imaging, in vivo behavioral pharmacology","pmids":["12466223"],"confidence":"High","gaps":["Downstream ion-channel target not yet identified","Relative PKR1 vs PKR2 contribution unresolved"]},{"year":2003,"claim":"Demonstrated direct angiogenic activity of PROK2 on endothelial cells and in vivo, establishing a vascular function distinct from neuronal signaling.","evidence":"Endothelial proliferation/survival/migration assays, adenoviral delivery, receptor immunolocalization","pmids":["12604792"],"confidence":"High","gaps":["Tissue selectivity mechanism not defined","Receptor subtype on endothelium not dissected"]},{"year":2004,"claim":"Established PROK2 as a hematopoietic/myeloid factor that drives granulocyte and monocyte differentiation and mobilization, broadening its role to immune cell biology.","evidence":"CFU assays, in vivo adenoviral delivery, leukocyte counts, pertussis-toxin-sensitive migration","pmids":["15548611"],"confidence":"High","gaps":["Transcriptional regulator of PROK2 in myeloid cells unknown","Receptor subtype not yet resolved"]},{"year":2005,"claim":"Mapped the N-terminal AVITGA hexapeptide as essential for receptor activation, with des-Ala-Val-Bv8 acting as a partial antagonist, providing the first structure-activity framework.","evidence":"N-terminal deletion mutants tested by binding, Ca2+, MAPK in CHO-PKR cells and in vivo hyperalgesia","pmids":["16113687"],"confidence":"High","gaps":["Structural basis of N-terminal engagement not yet solved","Receptor-subtype selectivity of mutants limited"]},{"year":2006,"claim":"Defined the molecular nociceptor mechanism: PROK2 sensitizes TRPV1 via PKCε translocation, explaining its hyperalgesic action at the channel level.","evidence":"Patch-clamp, PKCε translocation imaging, PKC antagonists, behavioral assay","pmids":["16687502"],"confidence":"High","gaps":["Receptor coupling to PKCε not fully mapped","Contribution of PKR1 vs PKR2 in nociceptors unresolved"]},{"year":2006,"claim":"Identified PKR1 (not pertussis-toxin-sensitive, U73122-blocked) as the receptor mediating macrophage chemotaxis and proinflammatory polarization, dissecting receptor-specific immune effects.","evidence":"Macrophage chemotaxis, cytokine ELISA, PT/U73122 inhibition, PKR1 knockout mice","pmids":["16299550"],"confidence":"High","gaps":["Gq coupling inferred pharmacologically, not directly measured","Downstream transcriptional program undefined"]},{"year":2007,"claim":"Connected PROK2 to tumor biology by showing G-CSF-driven Bv8 in CD11b+Gr1+ cells mediates myeloid mobilization and tumor angiogenesis, defining a therapeutically targetable axis.","evidence":"Adenoviral delivery, anti-Bv8 neutralizing antibody, FACS, tumor growth/vascular density in multiple models","pmids":["18064003"],"confidence":"High","gaps":["Direct STAT3-promoter mechanism not yet shown","Receptor on endothelium vs myeloid cells not separated"]},{"year":2007,"claim":"Localized a descending pain mechanism to GABAergic signaling in the PAG and RVM On/Off-cell modulation, expanding PROK2's pronociceptive action to supraspinal circuits.","evidence":"Intra-PAG injection, microdialysis, RVM electrophysiology, tail-flick test","pmids":["18005070"],"confidence":"Medium","gaps":["Receptor subtype in PAG not defined","Cellular source of GABA effect unresolved"]},{"year":2008,"claim":"Showed PKR1-dependent modulation of lymphocyte cytokines toward a Th1 profile, establishing receptor-specific adaptive immune effects.","evidence":"Splenocyte cytokine ELISA, in vivo immunization, PROKR1 knockout mice","pmids":["18957080"],"confidence":"Medium","gaps":["Direct vs indirect action on T cells not separated","Signaling pathway in lymphocytes undefined"]},{"year":2008,"claim":"Demonstrated in an endogenous transgenic tumor model that anti-Bv8 reduces angiogenic switching and links PROK2 to neutrophil-dependent angiogenesis.","evidence":"Anti-Bv8 antibody in RIP-Tag mice, vascular histology, FACS","pmids":["18268320"],"confidence":"High","gaps":["Molecular link between neutrophils and vessel formation not detailed","Receptor mediating endothelial response not identified"]},{"year":2008,"claim":"Placed PK2 circadian expression downstream of TTX-sensitive SCN neural activity rather than in the core clock, clarifying its position as an output signal.","evidence":"SCN slice culture, TTX treatment, in situ hybridization of 13 genes","pmids":["18279366"],"confidence":"Medium","gaps":["Mechanism coupling activity to PK2 transcription unknown","Receptor mediating circadian output not defined"]},{"year":2009,"claim":"Established endogenous granulocyte-derived PROK2 as a driver of inflammatory hypernociception and identified PKR1 as a regulator of PK2 levels during inflammation using dual-receptor knockouts.","evidence":"Granulocyte protein purification, PKR1/PKR2 knockouts, CFA model, antagonist dose-response","pmids":["19667192"],"confidence":"High","gaps":["Feedback mechanism controlling PK2 upregulation unresolved","Relative spinal vs peripheral contribution not fully separated"]},{"year":2010,"claim":"Solved the NMR structure and showed the core fold is dispensable for binding while N-terminal truncation abolishes activity, refining the structural model of receptor engagement.","evidence":"Chemical synthesis, NMR structure, functional assay of truncation mutant","pmids":["20677202"],"confidence":"High","gaps":["Receptor-bound structure not determined","Atomic contacts of N-terminus with receptor unknown"]},{"year":2010,"claim":"Identified Trp24 as a residue important for receptor interaction, adding a second determinant beyond the N-terminus.","evidence":"W24A mutagenesis, Pichia recombinant expression, binding assay","pmids":["20412858"],"confidence":"Medium","gaps":["Single-method functional readout","Receptor-subtype selectivity of W24A not addressed here"]},{"year":2012,"claim":"Demonstrated phospho-STAT3 binds the Bv8 promoter as a functional enhancer downstream of G-CSF, establishing the direct transcriptional control of PROK2 in myeloid cells.","evidence":"siRNA, WP1066, ChIP, luciferase reporter, in vivo validation","pmids":["22528488"],"confidence":"High","gaps":["Additional cofactors at the promoter not mapped","Cell-type specificity of regulation not fully defined"]},{"year":2012,"claim":"Dissected biphasic hyperalgesia into an early CGRP-release phase and a late protein-synthesis-dependent phase with CGRP/substance P upregulation, mechanistically separating acute and delayed sensitization.","evidence":"Ex vivo CGRP release, protein synthesis inhibitors, CGRP/SP immunohistochemistry","pmids":["22641053"],"confidence":"Medium","gaps":["Genes induced in the late phase not identified","Receptor subtype driving each phase unresolved"]},{"year":2012,"claim":"Generated a PKR2-preferring W24A analog that antagonizes hyperalgesia and engages central opioid (β-endorphin) pathways, demonstrating receptor-biased pharmacology with analgesic potential.","evidence":"Receptor binding, inflammatory/post-surgical pain models, β-endorphin radioimmunoassay","pmids":["22122547"],"confidence":"Medium","gaps":["Mechanism of central opioid recruitment via PKR2 not detailed","Selectivity margin in vivo not fully quantified"]},{"year":2013,"claim":"Showed PROK2 signals through JAK2 to activate STAT3 in myeloid cells, creating a feed-forward autocrine loop that sustains angiogenic/proliferative gene expression and tumor growth.","evidence":"JAK2 inhibition/knockdown, BV8 shRNA, STAT3 Western blot, xenograft growth","pmids":["23548897"],"confidence":"High","gaps":["Receptor subtype linking PROK2 to JAK2 not specified","Direct receptor-JAK2 coupling not biochemically resolved"]},{"year":2014,"claim":"Implicated PROK2/PKR2 signaling in neuropathic pain through neuron-glia interaction, with antagonism reducing microgliosis and restoring cytokine balance.","evidence":"CCI model, PKR antagonist (PC1) by multiple routes, immunohistochemistry, cytokine measurement","pmids":["24902717"],"confidence":"Medium","gaps":["Cellular source vs target of PROK2 in glia not separated","Causal step from glial activation to hyperalgesia not proven"]},{"year":2016,"claim":"Provided direct evidence that PROK2 sensitizes peripheral polymodal C-fibers to heat and enhances cutaneous CGRP release, pinpointing the peripheral mechanism of the first hyperalgesic phase.","evidence":"Single-fiber skin-nerve electrophysiology, CGRP release from skin, immunohistochemistry","pmids":["26914965"],"confidence":"Medium","gaps":["Channel target in C-fibers not directly identified here","Receptor subtype on cutaneous afferents not specified"]},{"year":2019,"claim":"Defined an essential developmental role for PROK2/PROKR2 in tangential and radial olfactory bulb interneuron migration, with cell-type-specific expression mapping ligand and receptor.","evidence":"Prok2-EGFP and Prokr2-LacZ reporter/knockout mice, immunohistochemistry, cell counting","pmids":["31132148"],"confidence":"High","gaps":["Signaling mechanism guiding migration not detailed","Whether PROK2 acts as a chemoattractant gradient untested here"]},{"year":2020,"claim":"Identified an AKT/GSK3β-dependent cytoprotective role for PROK2 in cardiomyocytes under metabolic stress, extending its survival signaling to cardiac tissue.","evidence":"AKT inhibitor, AKT-knockout cardiomyocytes, p-AKT/p-GSK3β Western blot, ROS/apoptosis assays, PKRA7 antagonist","pmids":["32508669"],"confidence":"Medium","gaps":["Relative PKR1 vs PKR2 contribution not separated","In vivo cardiac relevance not established"]},{"year":2022,"claim":"Localized PROK2's anorexigenic effect to amygdala PKR2 neurons modulated by MRAP2, defining a discrete neural circuit for feeding control.","evidence":"Viral PKR2 silencing, DREADD chemogenetics, food intake, MRAP2 manipulation","pmids":["36539034"],"confidence":"High","gaps":["Downstream feeding circuitry not mapped","Mechanism of MRAP2 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osteoporosis through the interaction between PROK2 and CSF3.","date":"2022","source":"Frontiers in neurology","url":"https://pubmed.ncbi.nlm.nih.gov/36203970","citation_count":8,"is_preprint":false},{"pmid":"26047640","id":"PMC_26047640","title":"EG-VEGF, BV8, and their receptor expression in human bronchi and their modification in cystic fibrosis: Impact of CFTR mutation (delF508).","date":"2015","source":"American journal of physiology. 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assay\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional bioassay in vivo and ex vivo with dose-response, single lab, two orthogonal readouts\",\n      \"pmids\": [\"10422759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The mammalian homologs of Bv8 (PROK2) are predominantly expressed in mid-late pachytene spermatocytes of the mouse testis, with two alternative mRNA splice forms identified, one encoding a basic-amino-acid-rich domain.\",\n      \"method\": \"cDNA cloning, in situ hybridization, Northern blot\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — molecular cloning and expression localization, single lab, replicated across splice variant analysis\",\n      \"pmids\": [\"10580115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PROK2 (mBv8) promotes survival of cerebellar granule cells and cortical neurons against apoptotic and excitotoxic death by activating both the MAPK (p44/p42) and PI-3-kinase/Akt pathways, as demonstrated by Western blot phosphorylation analysis and pharmacological inhibition with PD98059 and LY294002.\",\n      \"method\": \"Primary neuron culture survival assay; Western blot for phospho-MAPK and phospho-Akt; pharmacological pathway inhibition\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro functional assay with two orthogonal pharmacological inhibitors and biochemical pathway readout, single lab\",\n      \"pmids\": [\"11359521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PROK2/Bv8 binds PK-R1 and PK-R2 receptors in rat dorsal root ganglia (DRG) and dorsal spinal cord with high affinity (IC50 ~4–7 nM), raises [Ca2+]i in small-diameter DRG neurons, and produces intense systemic nociceptive sensitization to mechanical and thermal stimuli via peripheral and spinal mechanisms.\",\n      \"method\": \"Radioligand binding assay ([125I]-Bv8); intracellular calcium imaging; in vivo behavioral pharmacology (tail-flick, paw pressure)\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — receptor binding quantified with radioligand, calcium mobilization confirmed, in vivo behavioral readout, multiple orthogonal methods, independently replicated across labs\",\n      \"pmids\": [\"12466223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PROK2/Bv8 induces proliferation, survival, and migration of adrenal cortical capillary endothelial cells, and adenoviral delivery to mouse testis produces a potent angiogenic response; Bv8/EG-VEGF receptors are localized to vascular endothelial cells within the testis.\",\n      \"method\": \"Endothelial cell proliferation/survival/migration assays; adenoviral gene delivery in vivo; receptor immunolocalization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays (proliferation, survival, migration, in vivo angiogenesis) with receptor localization, replicated across related studies\",\n      \"pmids\": [\"12604792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PROK2/Bv8 promotes survival and differentiation of granulocytic and monocytic lineages from hematopoietic stem cells, stimulates monocyte migration in a pertussis-toxin-sensitive manner, and systemic exposure increases total leukocyte, neutrophil, and monocyte counts in vivo; its G-protein-coupled receptors are expressed on hematopoietic stem cells.\",\n      \"method\": \"Colony-forming unit assay (CFU-G, CFU-M); in vivo adenoviral Bv8 delivery; leukocyte counts; migration assay with pertussis toxin inhibition\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple functional assays in vitro and in vivo with pharmacological dissection, replicated by same and other labs\",\n      \"pmids\": [\"15548611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PROK2/Bv8 sensitizes TRPV1 in dorsal root ganglion nociceptors through activation of PKCε, causing translocation of PKCε to the neuronal membrane and enhancing TRPV1-mediated inward current; PKC antagonists reduce both TRPV1 current enhancement and behavioral hyperalgesia.\",\n      \"method\": \"Patch-clamp electrophysiology; PKCε translocation imaging; behavioral hyperalgesia assay; single-cell RT-PCR for PKR mRNA; GDNF-induced receptor expression\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — electrophysiology with pharmacological dissection, kinase translocation imaging, behavioral readout, multiple orthogonal methods in one study\",\n      \"pmids\": [\"16687502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PROK2/Bv8 induces potent chemotaxis of macrophages and a proinflammatory phenotype (increased IL-1, IL-12; decreased IL-10); these effects are not pertussis-toxin sensitive but are blocked by the phospholipase inhibitor U73122 (suggesting Gq coupling) and are absent in PKR-1 knockout mice, demonstrating PKR-1 as the mediating receptor.\",\n      \"method\": \"Macrophage chemotaxis assay; cytokine ELISA; pertussis toxin and U73122 pharmacological inhibition; PKR-1 knockout mice\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout plus pharmacological dissection confirming receptor identity and G-protein subtype, multiple orthogonal readouts\",\n      \"pmids\": [\"16299550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Bv8 (PROK2) is upregulated in CD11b+Gr1+ myeloid cells upon tumor implantation; G-CSF is identified as a major positive regulator of Bv8 expression; adenoviral Bv8 delivery to tumors promotes angiogenesis; anti-Bv8 antibodies reduce CD11b+Gr1+ cell mobilization and inhibit tumor angiogenesis and growth.\",\n      \"method\": \"Adenoviral gene delivery in vivo; anti-Bv8 neutralizing antibody treatment; FACS for CD11b+Gr1+ cells; tumor growth and vascular density measurements\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo functional gain- and loss-of-function experiments, multiple tumor models, replicated by independent groups\",\n      \"pmids\": [\"18064003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Intra-PAG injection of Bv8 increases GABA (but not glutamate) extracellular levels in the periaqueductal grey as measured by microdialysis, activates RVM On-cells and suppresses Off-cells, and decreases tail-flick latency, establishing a pronociceptive role via GABAergic signaling in the descending pain pathway.\",\n      \"method\": \"In vivo microdialysis; RVM electrophysiology (On/Off cell recording); tail-flick behavioral test\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo microdialysis and electrophysiology with behavioral correlation, single lab\",\n      \"pmids\": [\"18005070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bv8 (PROK2) decreases IL-4 and IL-10 production by mouse splenocytes while increasing IL-1β, shifting T cells toward a Th1 profile; this effect is absent in PROKR1 knockout mice, demonstrating PKR-1 as the sole mediating receptor for lymphocyte cytokine modulation.\",\n      \"method\": \"Cytokine ELISA in splenocyte culture; in vivo immunization; PROKR1 knockout mice\",\n      \"journal\": \"BMC immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout confirms receptor specificity, in vitro and in vivo concordant results, single lab\",\n      \"pmids\": [\"18957080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Anti-Bv8 treatment in RIP-Tag transgenic mice significantly reduces angiogenic switching in early pancreatic neoplasia and inhibits CD11b+Gr1+ cell mobilization and homing, with stage-dependent efficacy paralleling neutrophil ablation, implicating PROK2 as a mediator of neutrophil-dependent angiogenesis.\",\n      \"method\": \"In vivo anti-Bv8 antibody treatment in transgenic tumor model; histological vascular surface area measurement; FACS for CD11b+Gr1+ cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — endogenous transgenic model, quantitative histology and cell counting, replicated concept from Shojaei et al. 2007\",\n      \"pmids\": [\"18268320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Granulocyte-derived PROK2 (GrPK2) purified from peritoneal granulocytes binds prokineticin receptors with high affinity and induces hypernociception; PKR1 and PKR2 knockout mice show significantly less inflammation-induced hyperalgesia, and PKR1 knockout reduces inflammation-induced PK2 upregulation, establishing PKR1 as a regulator of PK2 levels during inflammation.\",\n      \"method\": \"Protein purification from peritoneal granulocytes; PKR1/PKR2 knockout mice; CFA paw inflammation model; PKR antagonist dose-response behavioral assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — purified endogenous protein, dual-receptor knockout, pharmacological antagonism, replicated across labs\",\n      \"pmids\": [\"19667192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"G-CSF induces Bv8/PROK2 expression in CD11b+Gr1+ myeloid cells via STAT3 activation; STAT3 inhibition or siRNA knockdown reduces G-CSF-induced Bv8 expression; chromatin immunoprecipitation demonstrates phospho-STAT3 binding to the Bv8 promoter; luciferase assay confirms this binding site as a functional transcriptional enhancer.\",\n      \"method\": \"siRNA knockdown; pharmacological STAT3 inhibition (WP1066); chromatin immunoprecipitation (ChIP); luciferase reporter assay; in vivo validation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ChIP plus luciferase reporter plus genetic knockdown, multiple orthogonal methods confirming STAT3 as direct transcriptional activator of PROK2\",\n      \"pmids\": [\"22528488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Bv8 induces biphasic hyperalgesia: the early phase involves direct CGRP release from spinal cord tissue, while the late phase requires de novo protein synthesis and is associated with upregulation of CGRP and substance P immunoreactivity in dorsal horn and DRG; protein synthesis inhibitors block only the late phase.\",\n      \"method\": \"Ex vivo spinal cord CGRP release assay; in vivo protein synthesis inhibitor pretreatment; CGRP/substance P immunohistochemistry\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ex vivo biochemical assay combined with in vivo pharmacological dissection, single lab\",\n      \"pmids\": [\"22641053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BV8/PROK2 activates STAT3 in myeloid cells via JAK2; JAK2 genetic and pharmacological inhibition abrogates BV8-induced STAT3 activation; BV8 shRNA knockdown in human myeloid leukemia cells reduces STAT3 activity and downstream angiogenic/proliferative gene expression, decreasing tumor cell viability and in vivo tumor growth.\",\n      \"method\": \"JAK2 genetic knockdown and pharmacological inhibition; BV8 shRNA; STAT3 phosphorylation Western blot; in vivo xenograft tumor growth\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and pharmacological pathway dissection, in vitro and in vivo concordant results, confirms JAK2 as required kinase for BV8→STAT3 signaling\",\n      \"pmids\": [\"23548897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Deletion of the N-terminal alanine of Bv8 (des-Ala-Bv8) reduces receptor affinity and potency fivefold at both PKR1 and PKR2 and reduces hyperalgesic potency ~20-fold; deletion of the first two residues (des-Ala-Val-Bv8) abolishes all biological activity in vitro and in vivo but enables partial antagonism of Bv8-induced hyperalgesia, demonstrating that the N-terminal hexapeptide AVITGA is essential for receptor activation.\",\n      \"method\": \"Radioligand binding; intracellular Ca2+ mobilization; MAPK phosphorylation in CHO cells expressing PKR1/PKR2; in vivo hyperalgesia assay\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure-activity relationship with multiple N-terminal deletion mutants, in vitro receptor assays and in vivo behavioral validation\",\n      \"pmids\": [\"16113687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Chemical synthesis and NMR structure determination of Bv8 (77 residues, five disulfide bonds) revealed it is structurally homologous to mamba intestinal toxin 1; a truncated mutant lacking five N-terminal residues shows no perturbation to the core structure yet loses receptor binding activity, indicating receptor interaction is highly cooperative and likely involves the N-terminal region without global structural rearrangement.\",\n      \"method\": \"Chemical synthesis (Boc SPPS + native chemical ligation); NMR structure determination; in vitro functional assay in neuroblastoma cells and DRG neurons\",\n      \"journal\": \"Chembiochem\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional validation of N-terminal deletion mutant, single lab but rigorous multi-method approach\",\n      \"pmids\": [\"20677202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tryptophan at position 24 of Bv8/PROK2 is important for PKR interaction; W24A substitution reduces receptor binding affinity and biological activity, as demonstrated by recombinant protein production in Pichia pastoris and receptor binding assays.\",\n      \"method\": \"Site-directed mutagenesis (W24A); recombinant protein expression in Pichia pastoris; PKR binding assay\",\n      \"journal\": \"Protein expression and purification\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — mutagenesis with functional readout, single lab, single method\",\n      \"pmids\": [\"20412858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A W24A Bv8 analog (A-24) preferentially binds PKR2 over PKR1 with lower potency; at inactive doses it antagonizes Bv8-induced hyperalgesia; systemically it increases β-endorphin levels in mouse brain and shows anti-hyperalgesic activity in inflammatory and post-surgical pain models by blocking peripheral PKR1 and activating central opioid pathways via PKR2.\",\n      \"method\": \"Receptor binding assay; in vivo hyperalgesia models (inflammatory, post-surgical); β-endorphin radioimmunoassay\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor-selective analog with in vitro and in vivo functional dissection, single lab\",\n      \"pmids\": [\"22122547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PROK2 and PKR2 are upregulated in nociceptors, Schwann cells, and activated astrocytes of the spinal cord after chronic constriction injury; systemic PKR antagonist treatment reduces neuropathic hyperalgesia and allodynia, blunts microgliosis and astrocyte activation, and restores cytokine balance, establishing PROK2/PKR2 signaling as a contributor to neuropathic pain via neuron-glia interaction.\",\n      \"method\": \"CCI neuropathic pain model; intrathecal, perineural, and subcutaneous PKR antagonist (PC1) injection; immunohistochemistry for PROK2/PKR2/glia markers; cytokine measurement\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with pharmacological antagonist, immunohistochemical localization, cytokine readout, single lab\",\n      \"pmids\": [\"24902717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Peripheral cutaneous application of Bv8 at nanomolar concentrations directly sensitizes unmyelinated polymodal C-fibers to heat (increased heat-evoked discharge, lower threshold), and increases heat- and capsaicin-evoked CGRP release from hind-paw skin, confirming peripheral nociceptor sensitization as the mechanism for the first phase of Bv8-induced thermal hyperalgesia.\",\n      \"method\": \"Single cutaneous fiber electrophysiology; skin-nerve preparation; CGRP release assay from hind-paw skin flaps; immunohistochemistry\",\n      \"journal\": \"European journal of pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiological recording from single fibers with CGRP biochemical confirmation, single lab\",\n      \"pmids\": [\"26914965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PROK2/PROKR2 signaling is required for tangential and radial migration of olfactory bulb interneurons through the SVZ-RMS-OB pathway; Prok2 and Prokr2 mutant mice show ~75% loss of GABAergic interneurons in the olfactory bulb; PROKR2 is expressed in postmitotic immature interneurons, while PROK2 is expressed in a subset of mature OB granule and tufted cells but not in SVZ progenitors.\",\n      \"method\": \"Prok2EGFP transgenic and Prokr2LacZ/+ knockin mice; immunohistochemistry; cell counting in mutant vs. wildtype OB\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockin/transgenic reporter lines with knockout phenotype, quantitative cell-type-specific localization, well-controlled\",\n      \"pmids\": [\"31132148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The anorexigenic effect of PK2/PROK2 is mediated specifically by PKR2 neurons in the amygdala (not hypothalamus); targeted PKR2 silencing in the amygdala abolishes PK2-induced food intake reduction; chemogenetic activation of amygdala PKR2 neurons suppresses feeding; MRAP2 expression in PKR2 neurons modulates PK2 anorexigenic activity.\",\n      \"method\": \"Targeted PKR2 silencing (viral); chemogenetic (DREADD) manipulation of amygdala PKR2 neurons; food intake measurement; MRAP2 overexpression/knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — region-specific genetic silencing combined with chemogenetics, multiple approaches converging on same conclusion\",\n      \"pmids\": [\"36539034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TTX-sensitive local electrophysiological activity in the suprachiasmatic nucleus (SCN) is required for full expression of PK2 circadian mRNA rhythm; TTX application substantially dampened the PK2 mRNA rhythm while leaving core clock gene rhythms (Per1, Per2, Bmal1, Cry1) intact, placing PK2 downstream of clock-driven neural activity rather than directly in the core oscillator.\",\n      \"method\": \"SCN slice culture; TTX pharmacological treatment; in situ hybridization for 13 genes including PK2 at 4-h intervals\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis in cultured SCN slices with multi-gene parallel readout, single lab\",\n      \"pmids\": [\"18279366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PK2/PROK2 signals through PKR1/PKR2 to activate the AKT/GSK3β pathway in cardiomyocytes; PK2 attenuates high glucose/palmitic acid-induced ROS, apoptosis, and autophagosome accumulation in H9c2 cells; an AKT inhibitor abolishes PK2 protective effects, and AKT-knockout cardiomyocytes are unresponsive to PK2, establishing AKT as the required effector.\",\n      \"method\": \"AKT1/2 kinase inhibitor; AKT-knockout mouse cardiomyocytes; Western blot for p-AKT/p-GSK3β; ROS detection (DCFH-DA); flow cytometry for apoptosis; PKRA7 antagonist\",\n      \"journal\": \"Frontiers in physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic (AKT KO) and pharmacological (inhibitor + antagonist) orthogonal approaches, single lab\",\n      \"pmids\": [\"32508669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-23a and miR-23b directly bind the 3′ UTR of PROK2 mRNA and downregulate PROK2 expression; overexpression of miR-23a/b mimics reduces hypoxia-induced GC-2 spermatocyte apoptosis in vitro, identifying PROK2 as a direct miR-23a/b target mediating lycopene's protective effect in varicocele.\",\n      \"method\": \"miRNA mimic transfection; luciferase reporter (implied by 'directly bind'); Western blot for PROK2; flow cytometry for apoptosis; miR-seq in vivo\",\n      \"journal\": \"Reproduction, fertility, and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — miRNA target validation with functional rescue, single lab\",\n      \"pmids\": [\"38301353\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PROK2 (prokineticin 2/Bv8) is a secreted ~8 kDa protein with a conserved N-terminal AVITGA motif and five disulfide bonds that signals through two GPCRs (PROKR1 and PROKR2) coupled to Gq and JAK2/STAT3 pathways; it acts as a hematopoietic and myeloid-cell mobilizing factor regulated transcriptionally by G-CSF via STAT3, promotes tissue-selective angiogenesis by stimulating endothelial cell proliferation/survival/migration, drives inflammatory and neuropathic pain by sensitizing peripheral TRPV1-expressing nociceptors through PKCε activation and increasing excitatory neurotransmitter release in spinal circuits, supports neuronal survival via MAPK/PI3K-Akt pathways, is required for olfactory bulb interneuron migration via PROKR2, mediates food intake suppression via amygdala PKR2 neurons, and has its circadian expression in the SCN maintained downstream of sodium-channel-dependent neural activity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PROK2 (prokineticin 2/Bv8) is a small secreted signaling protein with a conserved N-terminal AVITGA hexapeptide and five disulfide bonds that acts through the GPCRs PROKR1 and PROKR2 to coordinate nociception, myeloid/hematopoietic mobilization, angiogenesis, and CNS circuit development [#3, #16, #17]. Structure-activity work establishes that receptor activation depends critically on the N-terminus: deletion of the first residues abolishes activity and yields a partial antagonist, while the core disulfide-stabilized fold (homologous to mamba intestinal toxin 1) is dispensable for binding, indicating a cooperative N-terminal interaction with the receptor [#16, #17]. In the somatosensory system PROK2 drives nociceptive sensitization by binding PKR1/PKR2 on small-diameter DRG neurons, raising intracellular Ca2+ and sensitizing TRPV1 through PKCε translocation, and by acting peripherally on polymodal C-fibers and centrally in the spinal cord and descending PAG/RVM circuitry to release CGRP, substance P, and GABA [#3, #6, #9, #14, #21]; this pathway contributes to inflammatory and neuropathic pain involving neuron–glia interaction [#12, #20]. As a myeloid effector, PROK2 is induced in CD11b+Gr1+ cells by G-CSF via direct STAT3 binding to its promoter, mobilizes neutrophils and monocytes, and promotes tumor angiogenesis; PROK2 in turn signals through JAK2 to activate STAT3 in myeloid cells, and it stimulates endothelial cell proliferation, survival, and migration to drive tissue-selective angiogenesis [#5, #8, #11, #13, #15, #4]. PROK2 also supports neuronal survival via MAPK and PI3K/Akt pathways [#2], is required via PROKR2 for migration of olfactory bulb GABAergic interneurons [#22], mediates anorexigenic signaling through amygdala PKR2 neurons [#23], and its circadian expression in the SCN is maintained downstream of TTX-sensitive neural activity rather than in the core oscillator [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that the Bv8/prokineticin peptide is a bioactive signaling molecule capable of smooth-muscle contraction and central nociceptive modulation, defining its core pharmacology before receptors were known.\",\n      \"evidence\": \"In vivo icv injection and guinea-pig ileum contraction bioassay\",\n      \"pmids\": [\"10422759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No receptor identified\", \"Mammalian ortholog function not yet addressed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified the mammalian PROK2 gene and its restricted testicular expression with alternative splice forms, providing the molecular entity behind the amphibian bioactivity.\",\n      \"evidence\": \"cDNA cloning, in situ hybridization, Northern blot in mouse testis\",\n      \"pmids\": [\"10580115\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of splice variants unresolved\", \"No receptor or signaling pathway defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed PROK2 promotes neuronal survival, extending its role beyond contraction/pain to trophic signaling via MAPK and PI3K/Akt.\",\n      \"evidence\": \"Primary neuron survival assays with PD98059/LY294002 inhibition and phospho-Western blots\",\n      \"pmids\": [\"11359521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor identity not established in this system\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined high-affinity binding to PKR1/PKR2 and Ca2+ mobilization in DRG neurons as the mechanism linking PROK2 to systemic nociceptive sensitization.\",\n      \"evidence\": \"Radioligand binding, calcium imaging, in vivo behavioral pharmacology\",\n      \"pmids\": [\"12466223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream ion-channel target not yet identified\", \"Relative PKR1 vs PKR2 contribution unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated direct angiogenic activity of PROK2 on endothelial cells and in vivo, establishing a vascular function distinct from neuronal signaling.\",\n      \"evidence\": \"Endothelial proliferation/survival/migration assays, adenoviral delivery, receptor immunolocalization\",\n      \"pmids\": [\"12604792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue selectivity mechanism not defined\", \"Receptor subtype on endothelium not dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Established PROK2 as a hematopoietic/myeloid factor that drives granulocyte and monocyte differentiation and mobilization, broadening its role to immune cell biology.\",\n      \"evidence\": \"CFU assays, in vivo adenoviral delivery, leukocyte counts, pertussis-toxin-sensitive migration\",\n      \"pmids\": [\"15548611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional regulator of PROK2 in myeloid cells unknown\", \"Receptor subtype not yet resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapped the N-terminal AVITGA hexapeptide as essential for receptor activation, with des-Ala-Val-Bv8 acting as a partial antagonist, providing the first structure-activity framework.\",\n      \"evidence\": \"N-terminal deletion mutants tested by binding, Ca2+, MAPK in CHO-PKR cells and in vivo hyperalgesia\",\n      \"pmids\": [\"16113687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of N-terminal engagement not yet solved\", \"Receptor-subtype selectivity of mutants limited\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the molecular nociceptor mechanism: PROK2 sensitizes TRPV1 via PKCε translocation, explaining its hyperalgesic action at the channel level.\",\n      \"evidence\": \"Patch-clamp, PKCε translocation imaging, PKC antagonists, behavioral assay\",\n      \"pmids\": [\"16687502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor coupling to PKCε not fully mapped\", \"Contribution of PKR1 vs PKR2 in nociceptors unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified PKR1 (not pertussis-toxin-sensitive, U73122-blocked) as the receptor mediating macrophage chemotaxis and proinflammatory polarization, dissecting receptor-specific immune effects.\",\n      \"evidence\": \"Macrophage chemotaxis, cytokine ELISA, PT/U73122 inhibition, PKR1 knockout mice\",\n      \"pmids\": [\"16299550\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Gq coupling inferred pharmacologically, not directly measured\", \"Downstream transcriptional program undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected PROK2 to tumor biology by showing G-CSF-driven Bv8 in CD11b+Gr1+ cells mediates myeloid mobilization and tumor angiogenesis, defining a therapeutically targetable axis.\",\n      \"evidence\": \"Adenoviral delivery, anti-Bv8 neutralizing antibody, FACS, tumor growth/vascular density in multiple models\",\n      \"pmids\": [\"18064003\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct STAT3-promoter mechanism not yet shown\", \"Receptor on endothelium vs myeloid cells not separated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Localized a descending pain mechanism to GABAergic signaling in the PAG and RVM On/Off-cell modulation, expanding PROK2's pronociceptive action to supraspinal circuits.\",\n      \"evidence\": \"Intra-PAG injection, microdialysis, RVM electrophysiology, tail-flick test\",\n      \"pmids\": [\"18005070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor subtype in PAG not defined\", \"Cellular source of GABA effect unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed PKR1-dependent modulation of lymphocyte cytokines toward a Th1 profile, establishing receptor-specific adaptive immune effects.\",\n      \"evidence\": \"Splenocyte cytokine ELISA, in vivo immunization, PROKR1 knockout mice\",\n      \"pmids\": [\"18957080\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect action on T cells not separated\", \"Signaling pathway in lymphocytes undefined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated in an endogenous transgenic tumor model that anti-Bv8 reduces angiogenic switching and links PROK2 to neutrophil-dependent angiogenesis.\",\n      \"evidence\": \"Anti-Bv8 antibody in RIP-Tag mice, vascular histology, FACS\",\n      \"pmids\": [\"18268320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between neutrophils and vessel formation not detailed\", \"Receptor mediating endothelial response not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed PK2 circadian expression downstream of TTX-sensitive SCN neural activity rather than in the core clock, clarifying its position as an output signal.\",\n      \"evidence\": \"SCN slice culture, TTX treatment, in situ hybridization of 13 genes\",\n      \"pmids\": [\"18279366\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling activity to PK2 transcription unknown\", \"Receptor mediating circadian output not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established endogenous granulocyte-derived PROK2 as a driver of inflammatory hypernociception and identified PKR1 as a regulator of PK2 levels during inflammation using dual-receptor knockouts.\",\n      \"evidence\": \"Granulocyte protein purification, PKR1/PKR2 knockouts, CFA model, antagonist dose-response\",\n      \"pmids\": [\"19667192\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Feedback mechanism controlling PK2 upregulation unresolved\", \"Relative spinal vs peripheral contribution not fully separated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Solved the NMR structure and showed the core fold is dispensable for binding while N-terminal truncation abolishes activity, refining the structural model of receptor engagement.\",\n      \"evidence\": \"Chemical synthesis, NMR structure, functional assay of truncation mutant\",\n      \"pmids\": [\"20677202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor-bound structure not determined\", \"Atomic contacts of N-terminus with receptor unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Trp24 as a residue important for receptor interaction, adding a second determinant beyond the N-terminus.\",\n      \"evidence\": \"W24A mutagenesis, Pichia recombinant expression, binding assay\",\n      \"pmids\": [\"20412858\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-method functional readout\", \"Receptor-subtype selectivity of W24A not addressed here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated phospho-STAT3 binds the Bv8 promoter as a functional enhancer downstream of G-CSF, establishing the direct transcriptional control of PROK2 in myeloid cells.\",\n      \"evidence\": \"siRNA, WP1066, ChIP, luciferase reporter, in vivo validation\",\n      \"pmids\": [\"22528488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Additional cofactors at the promoter not mapped\", \"Cell-type specificity of regulation not fully defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dissected biphasic hyperalgesia into an early CGRP-release phase and a late protein-synthesis-dependent phase with CGRP/substance P upregulation, mechanistically separating acute and delayed sensitization.\",\n      \"evidence\": \"Ex vivo CGRP release, protein synthesis inhibitors, CGRP/SP immunohistochemistry\",\n      \"pmids\": [\"22641053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genes induced in the late phase not identified\", \"Receptor subtype driving each phase unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Generated a PKR2-preferring W24A analog that antagonizes hyperalgesia and engages central opioid (β-endorphin) pathways, demonstrating receptor-biased pharmacology with analgesic potential.\",\n      \"evidence\": \"Receptor binding, inflammatory/post-surgical pain models, β-endorphin radioimmunoassay\",\n      \"pmids\": [\"22122547\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of central opioid recruitment via PKR2 not detailed\", \"Selectivity margin in vivo not fully quantified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed PROK2 signals through JAK2 to activate STAT3 in myeloid cells, creating a feed-forward autocrine loop that sustains angiogenic/proliferative gene expression and tumor growth.\",\n      \"evidence\": \"JAK2 inhibition/knockdown, BV8 shRNA, STAT3 Western blot, xenograft growth\",\n      \"pmids\": [\"23548897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor subtype linking PROK2 to JAK2 not specified\", \"Direct receptor-JAK2 coupling not biochemically resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Implicated PROK2/PKR2 signaling in neuropathic pain through neuron-glia interaction, with antagonism reducing microgliosis and restoring cytokine balance.\",\n      \"evidence\": \"CCI model, PKR antagonist (PC1) by multiple routes, immunohistochemistry, cytokine measurement\",\n      \"pmids\": [\"24902717\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular source vs target of PROK2 in glia not separated\", \"Causal step from glial activation to hyperalgesia not proven\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided direct evidence that PROK2 sensitizes peripheral polymodal C-fibers to heat and enhances cutaneous CGRP release, pinpointing the peripheral mechanism of the first hyperalgesic phase.\",\n      \"evidence\": \"Single-fiber skin-nerve electrophysiology, CGRP release from skin, immunohistochemistry\",\n      \"pmids\": [\"26914965\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Channel target in C-fibers not directly identified here\", \"Receptor subtype on cutaneous afferents not specified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined an essential developmental role for PROK2/PROKR2 in tangential and radial olfactory bulb interneuron migration, with cell-type-specific expression mapping ligand and receptor.\",\n      \"evidence\": \"Prok2-EGFP and Prokr2-LacZ reporter/knockout mice, immunohistochemistry, cell counting\",\n      \"pmids\": [\"31132148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling mechanism guiding migration not detailed\", \"Whether PROK2 acts as a chemoattractant gradient untested here\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified an AKT/GSK3β-dependent cytoprotective role for PROK2 in cardiomyocytes under metabolic stress, extending its survival signaling to cardiac tissue.\",\n      \"evidence\": \"AKT inhibitor, AKT-knockout cardiomyocytes, p-AKT/p-GSK3β Western blot, ROS/apoptosis assays, PKRA7 antagonist\",\n      \"pmids\": [\"32508669\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative PKR1 vs PKR2 contribution not separated\", \"In vivo cardiac relevance not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Localized PROK2's anorexigenic effect to amygdala PKR2 neurons modulated by MRAP2, defining a discrete neural circuit for feeding control.\",\n      \"evidence\": \"Viral PKR2 silencing, DREADD chemogenetics, food intake, MRAP2 manipulation\",\n      \"pmids\": [\"36539034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream feeding circuitry not mapped\", \"Mechanism of MRAP2 modulation of PKR2 unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified miR-23a/b as direct post-transcriptional repressors of PROK2 mediating protection of spermatocytes from hypoxic apoptosis, adding a regulatory layer in reproductive tissue.\",\n      \"evidence\": \"miRNA mimics, luciferase 3'UTR reporter, PROK2 Western blot, apoptosis flow cytometry, miR-seq\",\n      \"pmids\": [\"38301353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context of repression beyond varicocele model unclear\", \"Receptor-level consequences of PROK2 reduction not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ligand achieves tissue-selective outcomes — pain, angiogenesis, myeloid mobilization, neuronal migration, feeding — through only two receptors remains unresolved, particularly the structural and signaling basis of PKR1 vs PKR2 selectivity and G-protein coupling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No receptor-bound structure of PROK2\", \"Mechanism partitioning Gq vs JAK2/STAT3 outputs across cell types undefined\", \"Determinants of tissue-selective angiogenesis unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [3, 16, 17]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 7, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [12, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 15, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 7, 8, 10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 6, 22]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PROKR1\", \"PROKR2\", \"STAT3\", \"JAK2\", \"MRAP2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}