{"gene":"PDCD10","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2008,"finding":"CCM3/PDCD10 is a component of the large STRIPAK (striatin-interacting phosphatase and kinase) complex, which contains PP2A catalytic and scaffolding subunits, striatins, Mob3, STRIP1/2, and germinal center kinase III family members; affinity purification/mass spectrometry showed that a large portion of CCM3 resides within this complex.","method":"Iterative affinity purification/mass spectrometry (AP-MS)","journal":"Molecular & cellular proteomics : MCP","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal AP-MS with high coverage, independently validated in multiple subsequent studies","pmids":["18782753"],"is_preprint":false},{"year":2007,"finding":"CCM3/PDCD10 directly binds STK25 (SOK1/YSK1), is phosphorylated by STK25, and is dephosphorylated by the phosphatase domain of FAP-1 (PTPN13); CCM3 also co-precipitates and co-localizes with CCM2, and STK25 forms a complex with CCM2, linking all three CCM proteins.","method":"Co-immunoprecipitation, yeast two-hybrid, direct binding assays, in vitro kinase/phosphatase assays","journal":"Neurogenetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase/phosphatase assays plus co-IP, multiple orthogonal methods in one study, confirmed by subsequent work","pmids":["17657516"],"is_preprint":false},{"year":2007,"finding":"PDCD10 interacts with the Ste20-related kinase MST4 (confirmed by co-IP and co-localization), and PDCD10 increases MST4 kinase activity in vitro; co-overexpression promotes cell proliferation and transformation via ERK pathway activation, while siRNA knockdown of either protein reduces ERK activity and cell growth.","method":"Yeast two-hybrid, co-immunoprecipitation, co-localization, in vitro kinase assay, siRNA knockdown, anchorage-independent growth assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay plus co-IP plus functional knockdown/overexpression with defined ERK readout","pmids":["17360971"],"is_preprint":false},{"year":2008,"finding":"A CCM2 in-frame deletion (p.P11_K68del) abolishes CCM2's ability to interact with CCM1 and to form a CCM1/CCM2/CCM3 trimeric complex, while still binding CCM3 alone, establishing that full-length CCM2 with its N-terminal domain is required as the core scaffold of the CCM1/CCM2/CCM3 complex.","method":"Co-immunoprecipitation of expressed mutant and wild-type proteins in cell culture","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with defined deletion mutant showing loss of CCM1 interaction, single lab but multiple constructs tested","pmids":["18300272"],"is_preprint":false},{"year":2010,"finding":"Crystal structure of CCM3 at 2.5 Å revealed an all-alpha-helical protein with two domains: an N-terminal dimerization domain with a novel fold, and a C-terminal FAT-homology domain; CCM3 binds CCM2 via the FAT-homology domain using a conserved hydrophobic pocket (HP1), and mutation of HP1 abrogates CCM3-CCM2 interaction and disrupts CCM3 co-localization with paxillin at focal adhesions.","method":"X-ray crystallography (2.5 Å), co-immunoprecipitation with HP1 mutant, fluorescence co-localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with active-site mutagenesis confirming binding surface, multiple orthogonal validations","pmids":["20489202"],"is_preprint":false},{"year":2010,"finding":"CCM3 localizes to the Golgi apparatus and forms a complex with GCKIII family kinases and the Golgi-resident protein GM130; CCM3 depletion causes Golgi disassembly, impairs cell reorientation and migration in wound-healing assays, and leads to destabilization of GCKIII proteins and dephosphorylation of their substrate 14-3-3ζ; this phenotype is reversed by wild-type but not disease-associated mutant CCM3.","method":"siRNA knockdown, co-immunoprecipitation, immunofluorescence/colocalization, wound-healing assay, Western blot","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, localization, functional rescue with WT vs disease mutant), replicated in part by other labs","pmids":["20332113"],"is_preprint":false},{"year":2010,"finding":"In zebrafish, CCM3 disease-causing mutant proteins (CCM3Δ) interact with CCM1 and CCM2 but fail to bind MST4, STK24, and STK25; loss of stk genes in zebrafish recapitulates CCM cardiovascular phenotypes, and CCM3/STK25 regulate endothelial barrier function; STKs negatively regulate Rho by directly activating moesin.","method":"Co-immunoprecipitation, zebrafish morpholino knockdown (genetic epistasis), endothelial barrier function assays, Rho activity assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in zebrafish combined with co-IP and functional assays, multiple orthogonal approaches","pmids":["20592472"],"is_preprint":false},{"year":2011,"finding":"The N-terminal dimerization domain of CCM3 is necessary and sufficient to bind directly to the C-terminal tail of GCKIII proteins (MST4, STK24, STK25), using the same surface as CCM3 homodimerization; sequence conservation and binding studies indicate preferential CCM3-GCKIII heterodimerization over homodimerization.","method":"Biochemical binding assays, domain mapping, sequence analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding assays with domain truncations, confirmed structurally by a subsequent crystal structure paper","pmids":["21561863"],"is_preprint":false},{"year":2011,"finding":"Crystal structures of CCM3 in complex with paxillin LD1, LD2, and LD4 motifs (at 2.8, 2.7, and 2.5 Å) show that CCM3 binds LD motifs via the conserved HP1 surface of the FAT-homology domain; surface plasmon resonance confirmed micromolar affinity; endogenous CCM3 and paxillin co-localize in mouse cerebral pericytes.","method":"X-ray crystallography (multiple structures), surface plasmon resonance, co-localization by immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple high-resolution crystal structures plus SPR quantification plus cellular co-localization","pmids":["21632544"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of the CCM3-GCKIII (MST4 C-terminal domain) complex demonstrated that CCM3 heterodimerizes with GCKIII kinases structurally analogous to CCM3 homodimerization; a flexible linker mediates large-scale conformational rotation of the FAT domain that permits disassembly of the CCM3 homodimer and subsequent heterodimerization; CCM3 forms a stable complex with MST4 in vivo to promote cell proliferation and migration dependent on MST4 kinase activity.","method":"X-ray crystallography, co-immunoprecipitation, cell proliferation and migration assays, kinase inhibitor treatment","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional validation (co-IP in vivo, kinase-dependent phenotype), multiple methods","pmids":["23541896"],"is_preprint":false},{"year":2012,"finding":"CCM3 mediates oxidative-stress-induced phosphorylation and activation of ERM (ezrin/radixin/moesin) proteins by the GCKIII kinase MST4; after oxidative stress, MST4 is activated and relocates to the cell periphery in a CCM3-dependent manner; loss of CCM3 impairs ERM phosphorylation and increases cell death upon reactive oxygen species exposure.","method":"siRNA knockdown, Western blot for phospho-ERM, cell viability assays, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic knockdown with defined phosphorylation readout, MST4 kinase dependency, replicated theme consistent with other GCKIII-CCM3 studies","pmids":["22291017"],"is_preprint":false},{"year":2012,"finding":"PDCD10 interacts with STK25, stabilizes STK25 protein through a proteasome-dependent pathway, and co-expression of PDCD10 and STK25 accelerates cell apoptosis under H2O2-induced oxidative stress; PDCD10/STK25 interaction modulates ERK activity under oxidative stress.","method":"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor treatment, cell apoptosis assays, ERK activity measurement","journal":"Frontiers in bioscience (Landmark edition)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional assays, single lab, multiple methods but limited mechanistic depth","pmids":["22652780"],"is_preprint":false},{"year":2011,"finding":"Neural cell-specific (astrocyte/neuron) deletion of Ccm3 in mice causes cell-autonomous activation of Akt signaling, increased astrocyte proliferation and survival, and non-cell-autonomous vascular phenotypes (dilated vasculature, cavernoma-like lesions) involving cytoskeletal remodeling pathways including protein kinase A and Rho-GTPase signaling.","method":"Conditional knockout mice (Gfap-Cre, Emx1-Cre), immunohistochemistry, RNA sequencing, Western blot","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with defined signaling readout (Akt) and RNA-seq pathway analysis","pmids":["21321212"],"is_preprint":false},{"year":2010,"finding":"PDCD10/CCM3 overexpression induces apoptosis (measured by TUNEL, caspase-3 activation, MTT) in endothelial cells, while disease-linked mutant forms do not; serum starvation-induced apoptosis increases CCM3 expression and activates p38; siRNA-mediated CCM3 knockdown reduces p38 activation and decreases cell death.","method":"TUNEL assay, MTT assay, caspase-3 activation assay, siRNA knockdown, Western blot","journal":"Stroke","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays with WT vs disease mutants, single lab","pmids":["19246713"],"is_preprint":false},{"year":2010,"finding":"PDCD10/CCM3 acts downstream of γ-protocadherins (PCDH-γ) to regulate neuronal survival; PCDH-γ isoforms interact with PDCD10 via their common cytoplasmic domain; RNAi knockdown of PDCD10 prevents apoptosis upon PCDH-γ depletion in chicken spinal neurons; overexpression of PDCD10 alone is sufficient to induce neuronal apoptosis.","method":"Co-immunoprecipitation, RNAi knockdown (epistasis), overexpression, apoptosis assay in developing chicken spinal neurons","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis in neurons with co-IP, single lab, two orthogonal methods","pmids":["21041308"],"is_preprint":false},{"year":2013,"finding":"CCM3 silencing in endothelial cells downregulates core Notch signaling components (DLL4, Notch4, HEY2, HES1) and activates VEGF and ERK pathways, causing hyper-angiogenesis; restoration of DLL4-Notch signaling fully rescued the hyper-angiogenic phenotype, defining DLL4 as a key downstream target of CCM3.","method":"siRNA knockdown, recombinant DLL4 rescue, proliferation/migration/sprouting assays, RT-PCR, Western blot","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic rescue experiment establishing pathway order, single lab, multiple assays","pmids":["23388056"],"is_preprint":false},{"year":2016,"finding":"CCM3 suppresses endothelial stress fibers, Rho kinase (ROCK) activity, and vascular permeability; PDCD10 siRNA knockdown in endothelial cells increases stress fibers, ROCK activity, and permeability in vitro, and Pdcd10 heterozygous mice show greater CCM lesion burden than other Ccm genotypes.","method":"siRNA knockdown, stress fiber staining, ROCK activity assay, permeability assay, mouse models","journal":"Genetics in medicine : official journal of the American College of Medical Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal assays (biochemical + cellular + in vivo mouse), replicated concept across CCM literature","pmids":["25122144"],"is_preprint":false},{"year":2016,"finding":"CCM3 suppresses UNC13B- and VAMP3-dependent exocytosis of angiopoietin-2 (ANGPT2) in brain endothelial cells; CCM3 deficiency augments ANGPT2 secretion, causing destabilized endothelial junctions, enlarged lumens, and pericyte dissociation; UNC13B deficiency or ANGPT2-neutralizing antibody normalizes these defects in endothelial CCM3-deficient mice.","method":"Genetic KO mouse model, antibody neutralization, exocytosis assays, vessel imaging, co-IP","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and pharmacological rescue experiments in vivo, mechanistic pathway defined with multiple orthogonal approaches","pmids":["27548575"],"is_preprint":false},{"year":2015,"finding":"CCM3 deficiency in endothelial cells causes cell-autonomous, Wnt-receptor-independent stimulation of β-catenin transcriptional activity and endothelial-to-mesenchymal transition; TGF-β/BMP signaling is required for disease progression; sulindac sulfide and sulfone attenuate β-catenin activity and reduce vascular malformations in CCM3-deficient mice.","method":"Endothelial-cell-selective CCM3 knockout mice, luciferase reporter assays, pharmacological treatment, histology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-autonomous demonstration with conditional KO, defined signaling pathway, pharmacological rescue in vivo","pmids":["26109568"],"is_preprint":false},{"year":2015,"finding":"CCM3 depletion in brain endothelial cells causes cortactin Ser-phosphorylation via tonic ERK1/2 activation, leading to cortactin dissociation from ZO-1 and actin, redistribution to cytosol, and degradation; this disrupts cortical actin ring organization, tight junction complex stability, and causes constant barrier hyperpermeability; ERK1/2 inhibition restores cortactin and barrier function.","method":"siRNA knockdown, immunofluorescence, Western blot, barrier permeability assay (inulin), ERK inhibitor treatment","journal":"Acta neuropathologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic pathway (CCM3→ERK1/2→cortactin→TJ) with pharmacological rescue, multiple orthogonal methods","pmids":["26385474"],"is_preprint":false},{"year":2018,"finding":"TRIM59 stabilizes PDCD10 by suppressing RNFT1-induced K63 polyubiquitination and subsequent p62/SQSTM1-selective autophagic degradation; PDCD10 mediates suppression of RhoA-ROCK1 signaling, controlling the transition between amoeboid and mesenchymal invasiveness in breast cancer cells.","method":"Co-immunoprecipitation, ubiquitination assays, autophagy flux experiments, siRNA/shRNA knockdown, cell migration/invasion assays, ROCK inhibitor rescue","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ubiquitination mechanism defined with multiple orthogonal experiments, pathway rescue with ROCK inhibitor or PDCD10 overexpression","pmids":["30408026"],"is_preprint":false},{"year":2021,"finding":"CCM3 localizes to focal adhesion sites in cancer-associated fibroblasts and mutually competes with focal adhesion kinase (FAK) for binding to paxillin, fine-tuning FAK/Src/paxillin-driven mechanotransduction and YAP/TAZ activation; specific loss of CCM3 in cancer-associated fibroblasts increases tissue remodeling and exacerbates YAP/TAZ activation in neighboring tumor cells.","method":"Immunofluorescence/focal adhesion localization, co-immunoprecipitation (CCM3/FAK/paxillin competition), mouse breast cancer models, YAP/TAZ reporter assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — competition co-IP defining molecular mechanism plus in vivo mouse model validation with defined phenotypic readout","pmids":["34226698"],"is_preprint":false},{"year":2017,"finding":"In C. elegans, CCM-3 and GCK-1 (GCKIII family kinase) work together to promote intercellular bridge stability and limit localization of anillin and non-muscle myosin II (NMM-II) to intercellular bridges; STRIPAK complex components striatin/CASH-1 and GCK-1 differentially control CCM-3 localization and function.","method":"C. elegans genetic knockdown/knockout, live imaging, biochemical analysis (STRIPAK complex)","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in C. elegans with live imaging and biochemical complex characterization, single lab","pmids":["28285996"],"is_preprint":false},{"year":2017,"finding":"In C. elegans, CCM-3 is enriched at the luminal membrane and at contractile rings; loss of ccm-3 causes defective RAB-11-mediated endocytic recycling, disrupting gonadal lumen formation, cytokinesis completion, and cell-surface receptor localization; MO25 ortholog mop-25.2 is required for CCM-3 apical membrane localization.","method":"C. elegans genetic knockdown/knockout, fluorescence imaging, endocytic recycling assays","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and localization studies in C. elegans, conservation of STRIPAK complex shown biochemically","pmids":["28285997"],"is_preprint":false},{"year":2019,"finding":"Loss of Pdcd10 (but not Krit1) in gut epithelial cells disrupts the colonic mucosal barrier, and chemical disruption of the gut barrier or loss of Mucin-2 augments CCM formation in mouse models, establishing a gut-brain disease axis in which PDCD10 is required for both brain endothelial signaling and gut epithelial barrier function; dexamethasone inhibits CCM formation by acting at both cell types.","method":"Tissue-specific conditional KO mice, gut permeability assays, pharmacological treatment, CCM lesion burden quantification","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific genetic dissection in mice with defined barrier readout and pharmacological rescue, multiple orthogonal in vivo approaches","pmids":["31776290"],"is_preprint":false},{"year":2021,"finding":"Pdcd10 knockout in kidney tubules causes polyuria; total and phosphorylated AQP2 protein levels at the apical membrane are decreased despite normal Aqp2 mRNA, associated with increased ERM protein expression and impaired intracellular vesicle trafficking; erlotinib (promoting exocytosis/inhibiting endocytosis) partially rescues water reabsorption defects, identifying a PDCD10-STK24/25-ERM signaling pathway regulating vesicle trafficking and AQP2 membrane targeting.","method":"Kidney-specific conditional KO mice, immunofluorescence/fractionation for AQP2 localization, pharmacological rescue (erlotinib), Western blot","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with defined molecular mechanism (vesicle trafficking→AQP2 localization) and pharmacological rescue in vivo","pmids":["34156031"],"is_preprint":false},{"year":2021,"finding":"CCM3 deletion in lymphatic endothelial cells augments VEGFR3-ERK1/2 signaling driving lymphatic hyperplasia; mechanistically, CCM3 binds importin alpha 2/KPNA2, and CCM3 deletion releases KPNA2 to activate NF-κB p65 nuclear translocation and p65-dependent VEGFR3 transcription; inhibition of VEGFR3 or ERK1/2 rescues lymphatic defects.","method":"Lymphatic-specific conditional KO mice, co-immunoprecipitation (CCM3-KPNA2), NF-κB nuclear translocation assay, VEGFR3/ERK1/2 inhibitor rescue, lymphatic function assays","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP defining CCM3-KPNA2 interaction plus conditional KO with pharmacological rescue, multiple orthogonal methods","pmids":["34670407"],"is_preprint":false},{"year":2021,"finding":"In a brain endothelial-specific Pdcd10-knockout (Pdcd10BECKO) mouse model, CCM lesions initiate from capillary/post-capillary venule protrusions with pericyte dissociation; caveolae are drastically increased in Pdcd10BECKO endothelium, enhancing Tie2 signaling; genetic deletion of caveolin-1 or pharmacological Tie2 blockade normalizes microvascular structure and reduces CCM lesion formation.","method":"Brain EC-specific conditional KO mice, two-photon microscopy, caveolin-1 KO epistasis, Tie2 inhibitor treatment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (caveolin-1 KO) plus pharmacological rescue establishing caveolae-Tie2 pathway, in vivo imaging","pmids":["33495460"],"is_preprint":false},{"year":2014,"finding":"CCM3 loss leads to RhoA activation, alterations in actin and microtubule cytoskeleton affecting neuronal morphology, and abnormalities in laminar positioning of late-born neurons in the neocortex; CCM3 is specifically required in radial glia and newly born pyramidal neurons for radial glia-dependent locomotion, with possible interaction with the Cdk5/RhoA pathway.","method":"Cell-type-specific conditional KO mice (radial glia/neuron-specific), RhoA activity assay, cytoskeletal immunostaining, cortical lamination analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with defined RhoA/cytoskeletal readout and layer-specific phenotype","pmids":["24595293"],"is_preprint":false},{"year":2024,"finding":"PDCD10 associates with MST4 kinase (demonstrated by proximity ligation assay), translocates it intracellularly, and thereby facilitates phosphorylation of RB and ERK1/2; in pancreatic cancer cells, PDCD10 promotes TGF-β-driven proliferation by inactivating RB via a SMAD4-dependent pathway and promotes EMT by increasing ERK1/2 activation via a non-SMAD4 pathway.","method":"Proximity ligation assay, PDCD10 knockout cell lines (CRISPR), Western blot, viability and migration assays, organoid models","journal":"Clinical science (London, England : 1979)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PLA for protein association plus CRISPR KO with defined signaling readouts, single lab","pmids":["39212293"],"is_preprint":false},{"year":2017,"finding":"CCM3 silencing in endothelial cells upregulates EphB4 mRNA, protein, and kinase activity and activates ERK1/2; EphB4 kinase inhibitor (NVP-BHG712) reverses the hyper-angiogenic phenotype, placing EphB4 downstream of CCM3/DLL4-Notch signaling in the pathway: CCM3→DLL4/Notch→EphB4→ERK1/2.","method":"siRNA knockdown, EphB4 kinase inhibitor treatment, in vitro and in vivo angiogenesis assays, RT-PCR, Western blot","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis defining pathway order, single lab, multiple assays","pmids":["28371279"],"is_preprint":false},{"year":2024,"finding":"CCM3 knockdown in endothelial cells induces activation and nuclear translocation of YAP/TAZ; YAP/TAZ inhibitor verteporfin reverses the pro-angiogenic effects of CCM3 silencing (proliferation, migration, tube formation, VEGF/VEGFR2 upregulation), establishing CCM3 as a regulator of the Hippo/YAP-TAZ pathway in angiogenesis.","method":"siRNA knockdown, YAP/TAZ nuclear translocation assay, verteporfin pharmacological rescue, HUVEC functional assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological rescue establishing pathway dependency, single lab, mechanistic readout confirmed","pmids":["38320423"],"is_preprint":false},{"year":2011,"finding":"In zebrafish, ccm3 deficiency causes cardiovascular phenotypes distinct from ccm1/ccm2 loss; ccm3 (but not ccm2) defects can be rescued by overexpression of stk25b (GCKIII kinase); morpholino knockdown of stk25b phenocopies ccm3 morphants; double knockdown of ccm3 and ccm2 shows synergistic vessel dilation, supporting a model where CCM3 acts via GCKIII activity in a pathway distinct from CCM1/CCM2.","method":"Zebrafish morpholino knockdown, genetic rescue (stk25b overexpression), phenotypic analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis by rescue and double-knockdown in zebrafish, consistent with mammalian data from other labs","pmids":["22182521"],"is_preprint":false},{"year":2023,"finding":"Loss of Pdcd10 in ureter urothelium causes hypertrophy, increased expression of uroplakins and keratins, modification of intracellular membrane systems (vesicle trafficking defects), swelling of Golgi compartments, disruption of mitochondrial cristae, increased lysosomal fusion, decreased fusiform vesicle formation, and increased exosome secretion, indicating PDCD10 regulates endomembrane trafficking and organelle biogenesis in epithelial cells.","method":"Conditional KO mice (Cdh16-Cre), immunocytochemistry, confocal and electron microscopy, mRNA expression analysis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with ultrastructural validation, single lab","pmids":["38037455"],"is_preprint":false}],"current_model":"PDCD10/CCM3 is a scaffold/adaptor protein that operates within the STRIPAK complex and in complex with GCKIII kinases (MST4, STK24, STK25); it stabilizes GCKIII kinase levels and activity, regulates ERK/Rho/ROCK signaling to control endothelial barrier integrity, cytoskeletal organization, vesicle trafficking (including AQP2 and angiopoietin-2 exocytosis), and mechanotransduction via a FAT-homology domain that competes with FAK for paxillin binding at focal adhesions; disease-causing mutations disrupt these protein–protein interactions and downstream signaling, leading to vascular malformations."},"narrative":{"mechanistic_narrative":"PDCD10/CCM3 is an all-alpha-helical scaffold/adaptor protein that organizes germinal center kinase III (GCKIII) signaling to control endothelial and epithelial barrier integrity, cytoskeletal organization, and membrane trafficking [PMID:18782753, PMID:20489202, PMID:21561863]. It resides within the STRIPAK phosphatase-kinase complex and binds the GCKIII kinases MST4, STK24, and STK25 through its N-terminal dimerization domain, which heterodimerizes with the kinase C-terminal tail using the same surface that mediates CCM3 homodimerization [PMID:18782753, PMID:21561863, PMID:23541896]; through these interactions CCM3 stabilizes GCKIII protein levels and potentiates their kinase activity toward substrates including the ERM proteins ezrin/radixin/moesin [PMID:17360971, PMID:20332113, PMID:22291017, PMID:22652780]. CCM3 additionally assembles with CCM1/CCM2 (scaffolded by full-length CCM2) and, via the conserved HP1 pocket of its C-terminal FAT-homology domain, binds paxillin LD motifs at focal adhesions, where it competes with focal adhesion kinase to tune FAK/Src/paxillin mechanotransduction and YAP/TAZ activation [PMID:17657516, PMID:18300272, PMID:20489202, PMID:21632544, PMID:34226698]. In endothelium, loss of CCM3 disrupts barrier function through multiple convergent routes: tonic ERK1/2 activation that destabilizes cortactin and tight junctions, RhoA/ROCK-driven stress fiber formation, increased UNC13B/VAMP3-dependent angiopoietin-2 exocytosis, caveolae-Tie2 signaling, suppression of DLL4-Notch with downstream EphB4/VEGF activation, and Wnt-independent beta-catenin activation driving endothelial-to-mesenchymal transition [PMID:25122144, PMID:27548575, PMID:26109568, PMID:26385474, PMID:33495460, PMID:28371279]. PDCD10 also regulates vesicle trafficking and organelle organization, controlling AQP2 membrane targeting in kidney tubules and endomembrane/Golgi integrity in epithelia [PMID:20332113, PMID:34156031, PMID:38037455], and contributes to apoptotic control downstream of gamma-protocadherins [PMID:21041308]. CCM3 protein abundance is itself controlled by ubiquitin-dependent turnover, with TRIM59 antagonizing RNFT1-mediated K63 polyubiquitination and p62-selective autophagic degradation [PMID:30408026]. Loss-of-function disrupts these protein interactions and signaling outputs, producing cerebral cavernous malformations, a disease in which Pdcd10 acts both in brain endothelium and, through a gut-brain axis, in gut epithelial barrier maintenance [PMID:20332113, PMID:20592472, PMID:25122144, PMID:31776290].","teleology":[{"year":2007,"claim":"Establishing CCM3 as a direct binding partner and substrate of GCKIII kinases defined it as a kinase-associated adaptor rather than a standalone effector, and linked it physically to the other CCM proteins.","evidence":"Yeast two-hybrid, co-IP, in vitro kinase/phosphatase assays and functional knockdown/overexpression with ERK readout for STK25 and MST4","pmids":["17657516","17360971"],"confidence":"High","gaps":["Did not resolve which GCKIII activities are physiologically dominant in vivo","Phosphorylation site function on CCM3 not defined"]},{"year":2008,"claim":"Placing a large fraction of CCM3 within the STRIPAK complex established its biochemical context as a hub coupling PP2A phosphatase activity to GCKIII kinases, and a mutant CCM2 experiment defined CCM2 as the core scaffold of the CCM1/CCM2/CCM3 trimer.","evidence":"Iterative AP-MS for STRIPAK membership; co-IP of CCM2 deletion mutant for trimer architecture","pmids":["18782753","18300272"],"confidence":"High","gaps":["Stoichiometry and dynamics of CCM3 within STRIPAK not defined","How CCM3 partitions between STRIPAK and the CCM1/2/3 complex unresolved"]},{"year":2010,"claim":"The crystal structure of CCM3 partitioned its functions into an N-terminal dimerization domain and a C-terminal FAT-homology domain whose HP1 pocket mediates CCM2 binding and focal-adhesion/paxillin colocalization, providing a structural basis for distinct interaction modes.","evidence":"X-ray crystallography at 2.5 A with HP1-mutant co-IP and colocalization","pmids":["20489202"],"confidence":"High","gaps":["Did not determine GCKIII binding surface (resolved later)","Functional consequence of homo- vs heterodimer switching unaddressed"]},{"year":2010,"claim":"Loss-of-function and rescue experiments demonstrated that CCM3 stabilizes GCKIII kinases and maintains Golgi integrity, cell migration, and endothelial barrier function, with disease mutants failing to bind GCKIII kinases and failing to rescue.","evidence":"siRNA knockdown, co-IP, wound-healing assays in cells, and zebrafish morpholino epistasis with Rho/moesin and barrier assays; disease-mutant rescue tests","pmids":["20332113","20592472"],"confidence":"High","gaps":["Mechanism coupling GCKIII stabilization to Golgi and barrier phenotypes incompletely defined","Cell type specificity of these effects not resolved"]},{"year":2011,"claim":"Mapping the GCKIII-binding surface to the N-terminal dimerization domain showed CCM3 preferentially heterodimerizes with GCKIII kinases over homodimerizing, defining the molecular logic of the CCM3-kinase module.","evidence":"Domain-truncation binding assays and sequence analysis","pmids":["21561863"],"confidence":"High","gaps":["Did not quantify homo/hetero equilibrium in cells","Regulation of the switch not addressed (resolved structurally in 2013)"]},{"year":2011,"claim":"Structural definition of CCM3-paxillin LD-motif binding via the HP1 FAT surface, with micromolar affinity and pericyte colocalization, established a direct CCM3 link to focal adhesion biology.","evidence":"Multiple crystal structures, SPR affinity measurement, and immunofluorescence colocalization in cerebral pericytes","pmids":["21632544"],"confidence":"High","gaps":["Functional consequence of paxillin binding not yet established (addressed in 2021)","Competition with other LD-motif partners not tested here"]},{"year":2011,"claim":"Conditional in vivo deletion separated cell-autonomous (Akt activation, proliferation/survival) from non-cell-autonomous vascular consequences, framing CCM3 loss as engaging multiple signaling axes including PKA and Rho-GTPase.","evidence":"Neural-cell-specific conditional KO mice with IHC, RNA-seq, and Western blot","pmids":["21321212"],"confidence":"High","gaps":["Causal chain from Akt to vascular lesions not dissected","Direct CCM3 effector for Akt activation unknown"]},{"year":2013,"claim":"The CCM3-MST4 complex crystal structure revealed a flexible-linker-driven conformational rotation enabling homodimer disassembly and heterodimer formation, tying the structural switch to kinase-activity-dependent proliferation and migration.","evidence":"X-ray crystallography with in vivo co-IP and kinase-inhibitor-dependent functional assays","pmids":["23541896"],"confidence":"High","gaps":["Trigger controlling the conformational switch in cells unknown","Whether STRIPAK regulates this transition unaddressed"]},{"year":2012,"claim":"Demonstrating CCM3-dependent, MST4-driven ERM phosphorylation under oxidative stress and STK25 protein stabilization connected the CCM3-GCKIII module to stress responses and cell survival.","evidence":"siRNA knockdown, phospho-ERM Western blot, proteasome inhibition, and viability/apoptosis assays under H2O2","pmids":["22291017","22652780"],"confidence":"Medium","gaps":["Single-lab apoptosis findings with limited mechanistic depth (idx 11)","Direction of CCM3 effect on cell death context-dependent and unresolved"]},{"year":2014,"claim":"Conditional KO in radial glia and neurons showed CCM3 controls RhoA activity and cytoskeletal organization required for neuronal migration and cortical lamination, generalizing its cytoskeletal regulatory role beyond endothelium.","evidence":"Cell-type-specific conditional KO mice, RhoA activity assays, cytoskeletal staining, lamination analysis","pmids":["24595293"],"confidence":"High","gaps":["Direct link to Cdk5/RhoA not biochemically established","GCKIII dependence of the neuronal phenotype untested here"]},{"year":2015,"claim":"Endothelial-specific studies defined two distinct barrier-disrupting mechanisms downstream of CCM3 loss: ERK1/2-driven cortactin destabilization of tight junctions, and Wnt-independent beta-catenin activation driving endothelial-to-mesenchymal transition, both pharmacologically rescuable.","evidence":"siRNA and conditional KO mice, barrier permeability assays, luciferase reporters, ERK inhibitor and sulindac rescue","pmids":["26385474","26109568"],"confidence":"High","gaps":["How CCM3 loss elevates tonic ERK1/2 not fully defined","Relationship between the cortactin and beta-catenin arms unresolved"]},{"year":2016,"claim":"Linking CCM3 loss to RhoA/ROCK-driven permeability and to UNC13B/VAMP3-dependent angiopoietin-2 exocytosis, with in vivo genetic and antibody rescue, established trafficking-level control of endothelial junction stability.","evidence":"siRNA, ROCK and permeability assays, mouse genetics, exocytosis assays, UNC13B KO and ANGPT2-neutralizing antibody rescue","pmids":["25122144","27548575"],"confidence":"High","gaps":["Mechanism connecting CCM3 to the exocytic machinery not defined at molecular level","Relative contribution of ROCK vs ANGPT2 arms in vivo unresolved"]},{"year":2018,"claim":"Defining a TRIM59/RNFT1 ubiquitin and p62-autophagy axis that sets PDCD10 abundance, and showing PDCD10 suppresses RhoA-ROCK1 to control cancer cell invasion mode, established post-translational control of CCM3 levels and a role in tumor cell biology.","evidence":"Co-IP, ubiquitination and autophagy-flux assays, knockdown, invasion assays with ROCK inhibitor rescue in breast cancer cells","pmids":["30408026"],"confidence":"High","gaps":["Physiological contexts where this turnover operates not mapped","Whether endothelial CCM3 levels are similarly regulated untested"]},{"year":2017,"claim":"Invertebrate genetics extended the CCM3-GCKIII partnership to intercellular bridge stability and RAB-11-mediated endocytic recycling, establishing conserved roles in cytokinesis, lumen formation, and membrane trafficking with STRIPAK-dependent localization control.","evidence":"C. elegans knockdown/knockout, live imaging, recycling assays, biochemical STRIPAK characterization","pmids":["28285996","28285997"],"confidence":"Medium","gaps":["Conservation of the recycling role in mammalian endothelium not directly shown","Single-organism findings (idx 22, 23)"]},{"year":2019,"claim":"Tissue-specific KO revealed that Pdcd10, unlike Krit1, is required for the colonic mucosal barrier, defining a gut-brain disease axis in which gut epithelial integrity modulates brain cavernous malformation burden.","evidence":"Tissue-specific conditional KO mice, gut permeability assays, Mucin-2 manipulation, dexamethasone rescue","pmids":["31776290"],"confidence":"High","gaps":["Molecular basis of CCM3 function in gut epithelium not defined","How gut signals reach brain endothelium unresolved"]},{"year":2021,"claim":"A series of conditional KO and interaction studies broadened CCM3 to lymphatic, renal, mechanosensing, and caveolar contexts—binding KPNA2 to restrain NF-kB/VEGFR3, controlling AQP2 trafficking via STK24/25-ERM, competing with FAK for paxillin to tune YAP/TAZ, and restraining caveolae-Tie2 signaling.","evidence":"Conditional KO mice in lymphatic/kidney/brain endothelium and cancer-associated fibroblasts, co-IP (KPNA2, FAK/paxillin), two-photon imaging, caveolin-1 KO epistasis, and pharmacological rescues","pmids":["34670407","34156031","34226698","33495460"],"confidence":"High","gaps":["Whether these tissue-specific mechanisms share a unifying biochemical step is unclear","Direct structural basis of FAK competition not solved"]},{"year":2024,"claim":"Additional tumor and angiogenesis studies positioned PDCD10 as a regulator of MST4-mediated RB/ERK phosphorylation in pancreatic cancer and of Hippo/YAP-TAZ in endothelium, reinforcing its adaptor role across proliferative and angiogenic programs.","evidence":"Proximity ligation assay, CRISPR KO, organoid models, and siRNA with verteporfin rescue","pmids":["39212293","38320423"],"confidence":"Medium","gaps":["Single-lab signaling readouts (idx 29, 31)","Direct vs indirect control of YAP/TAZ in endothelium not resolved"]},{"year":null,"claim":"How CCM3 dynamically partitions between STRIPAK, the CCM1/2/3 complex, GCKIII heterodimers, and focal-adhesion paxillin to select among its many downstream pathways in a given cell type remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking complex membership to pathway choice","Spatiotemporal regulation of the homo/heterodimer switch in vivo unknown","Quantitative flux between STRIPAK-bound and free CCM3 pools undetermined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,7,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator 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Modulates apoptotic pathways. Increases mitogen-activated protein kinase activity and STK26 activity (PubMed:27807006). Important for cell migration, and for normal structure and assembly of the Golgi complex (PubMed:27807006). Part of the striatin-interacting phosphatase and kinase (STRIPAK) complexes. STRIPAK complexes have critical roles in protein (de)phosphorylation and are regulators of multiple signaling pathways including Hippo, MAPK, nuclear receptor and cytoskeleton remodeling. Different types of STRIPAK complexes are involved in a variety of biological processes such as cell growth, differentiation, apoptosis, metabolism and immune regulation (PubMed:18782753). Important for KDR/VEGFR2 signaling. Increases the stability of KDR/VEGFR2 and prevents its breakdown. Required for normal cardiovascular development. Required for normal angiogenesis, vasculogenesis and hematopoiesis during embryonic development (By similarity)","subcellular_location":"Cytoplasm; Golgi apparatus membrane; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9BUL8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PDCD10","classification":"Not Classified","n_dependent_lines":26,"n_total_lines":1208,"dependency_fraction":0.02152317880794702},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PPP2CA","stoichiometry":10.0},{"gene":"STK25","stoichiometry":10.0},{"gene":"STK26","stoichiometry":10.0},{"gene":"STK24","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PDCD10","total_profiled":1310},"omim":[{"mim_id":"609118","title":"PROGRAMMED CELL DEATH 10; PDCD10","url":"https://www.omim.org/entry/609118"},{"mim_id":"607929","title":"CCM2 SCAFFOLD PROTEIN; CCM2","url":"https://www.omim.org/entry/607929"},{"mim_id":"604214","title":"KRIT1 ANKYRIN REPEAT-CONTAINING PROTEIN 1; KRIT1","url":"https://www.omim.org/entry/604214"},{"mim_id":"603285","title":"CEREBRAL CAVERNOUS MALFORMATIONS 3; CCM3","url":"https://www.omim.org/entry/603285"},{"mim_id":"603284","title":"CEREBRAL CAVERNOUS MALFORMATIONS 2; CCM2","url":"https://www.omim.org/entry/603284"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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affinity purification/mass spectrometry showed that a large portion of CCM3 resides within this complex.\",\n      \"method\": \"Iterative affinity purification/mass spectrometry (AP-MS)\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal AP-MS with high coverage, independently validated in multiple subsequent studies\",\n      \"pmids\": [\"18782753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CCM3/PDCD10 directly binds STK25 (SOK1/YSK1), is phosphorylated by STK25, and is dephosphorylated by the phosphatase domain of FAP-1 (PTPN13); CCM3 also co-precipitates and co-localizes with CCM2, and STK25 forms a complex with CCM2, linking all three CCM proteins.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, direct binding assays, in vitro kinase/phosphatase assays\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase/phosphatase assays plus co-IP, multiple orthogonal methods in one study, confirmed by subsequent work\",\n      \"pmids\": [\"17657516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PDCD10 interacts with the Ste20-related kinase MST4 (confirmed by co-IP and co-localization), and PDCD10 increases MST4 kinase activity in vitro; co-overexpression promotes cell proliferation and transformation via ERK pathway activation, while siRNA knockdown of either protein reduces ERK activity and cell growth.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, co-localization, in vitro kinase assay, siRNA knockdown, anchorage-independent growth assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay plus co-IP plus functional knockdown/overexpression with defined ERK readout\",\n      \"pmids\": [\"17360971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A CCM2 in-frame deletion (p.P11_K68del) abolishes CCM2's ability to interact with CCM1 and to form a CCM1/CCM2/CCM3 trimeric complex, while still binding CCM3 alone, establishing that full-length CCM2 with its N-terminal domain is required as the core scaffold of the CCM1/CCM2/CCM3 complex.\",\n      \"method\": \"Co-immunoprecipitation of expressed mutant and wild-type proteins in cell culture\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with defined deletion mutant showing loss of CCM1 interaction, single lab but multiple constructs tested\",\n      \"pmids\": [\"18300272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structure of CCM3 at 2.5 Å revealed an all-alpha-helical protein with two domains: an N-terminal dimerization domain with a novel fold, and a C-terminal FAT-homology domain; CCM3 binds CCM2 via the FAT-homology domain using a conserved hydrophobic pocket (HP1), and mutation of HP1 abrogates CCM3-CCM2 interaction and disrupts CCM3 co-localization with paxillin at focal adhesions.\",\n      \"method\": \"X-ray crystallography (2.5 Å), co-immunoprecipitation with HP1 mutant, fluorescence co-localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with active-site mutagenesis confirming binding surface, multiple orthogonal validations\",\n      \"pmids\": [\"20489202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CCM3 localizes to the Golgi apparatus and forms a complex with GCKIII family kinases and the Golgi-resident protein GM130; CCM3 depletion causes Golgi disassembly, impairs cell reorientation and migration in wound-healing assays, and leads to destabilization of GCKIII proteins and dephosphorylation of their substrate 14-3-3ζ; this phenotype is reversed by wild-type but not disease-associated mutant CCM3.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, immunofluorescence/colocalization, wound-healing assay, Western blot\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, localization, functional rescue with WT vs disease mutant), replicated in part by other labs\",\n      \"pmids\": [\"20332113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In zebrafish, CCM3 disease-causing mutant proteins (CCM3Δ) interact with CCM1 and CCM2 but fail to bind MST4, STK24, and STK25; loss of stk genes in zebrafish recapitulates CCM cardiovascular phenotypes, and CCM3/STK25 regulate endothelial barrier function; STKs negatively regulate Rho by directly activating moesin.\",\n      \"method\": \"Co-immunoprecipitation, zebrafish morpholino knockdown (genetic epistasis), endothelial barrier function assays, Rho activity assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in zebrafish combined with co-IP and functional assays, multiple orthogonal approaches\",\n      \"pmids\": [\"20592472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The N-terminal dimerization domain of CCM3 is necessary and sufficient to bind directly to the C-terminal tail of GCKIII proteins (MST4, STK24, STK25), using the same surface as CCM3 homodimerization; sequence conservation and binding studies indicate preferential CCM3-GCKIII heterodimerization over homodimerization.\",\n      \"method\": \"Biochemical binding assays, domain mapping, sequence analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding assays with domain truncations, confirmed structurally by a subsequent crystal structure paper\",\n      \"pmids\": [\"21561863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structures of CCM3 in complex with paxillin LD1, LD2, and LD4 motifs (at 2.8, 2.7, and 2.5 Å) show that CCM3 binds LD motifs via the conserved HP1 surface of the FAT-homology domain; surface plasmon resonance confirmed micromolar affinity; endogenous CCM3 and paxillin co-localize in mouse cerebral pericytes.\",\n      \"method\": \"X-ray crystallography (multiple structures), surface plasmon resonance, co-localization by immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple high-resolution crystal structures plus SPR quantification plus cellular co-localization\",\n      \"pmids\": [\"21632544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of the CCM3-GCKIII (MST4 C-terminal domain) complex demonstrated that CCM3 heterodimerizes with GCKIII kinases structurally analogous to CCM3 homodimerization; a flexible linker mediates large-scale conformational rotation of the FAT domain that permits disassembly of the CCM3 homodimer and subsequent heterodimerization; CCM3 forms a stable complex with MST4 in vivo to promote cell proliferation and migration dependent on MST4 kinase activity.\",\n      \"method\": \"X-ray crystallography, co-immunoprecipitation, cell proliferation and migration assays, kinase inhibitor treatment\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional validation (co-IP in vivo, kinase-dependent phenotype), multiple methods\",\n      \"pmids\": [\"23541896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CCM3 mediates oxidative-stress-induced phosphorylation and activation of ERM (ezrin/radixin/moesin) proteins by the GCKIII kinase MST4; after oxidative stress, MST4 is activated and relocates to the cell periphery in a CCM3-dependent manner; loss of CCM3 impairs ERM phosphorylation and increases cell death upon reactive oxygen species exposure.\",\n      \"method\": \"siRNA knockdown, Western blot for phospho-ERM, cell viability assays, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic knockdown with defined phosphorylation readout, MST4 kinase dependency, replicated theme consistent with other GCKIII-CCM3 studies\",\n      \"pmids\": [\"22291017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PDCD10 interacts with STK25, stabilizes STK25 protein through a proteasome-dependent pathway, and co-expression of PDCD10 and STK25 accelerates cell apoptosis under H2O2-induced oxidative stress; PDCD10/STK25 interaction modulates ERK activity under oxidative stress.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor treatment, cell apoptosis assays, ERK activity measurement\",\n      \"journal\": \"Frontiers in bioscience (Landmark edition)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional assays, single lab, multiple methods but limited mechanistic depth\",\n      \"pmids\": [\"22652780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Neural cell-specific (astrocyte/neuron) deletion of Ccm3 in mice causes cell-autonomous activation of Akt signaling, increased astrocyte proliferation and survival, and non-cell-autonomous vascular phenotypes (dilated vasculature, cavernoma-like lesions) involving cytoskeletal remodeling pathways including protein kinase A and Rho-GTPase signaling.\",\n      \"method\": \"Conditional knockout mice (Gfap-Cre, Emx1-Cre), immunohistochemistry, RNA sequencing, Western blot\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with defined signaling readout (Akt) and RNA-seq pathway analysis\",\n      \"pmids\": [\"21321212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PDCD10/CCM3 overexpression induces apoptosis (measured by TUNEL, caspase-3 activation, MTT) in endothelial cells, while disease-linked mutant forms do not; serum starvation-induced apoptosis increases CCM3 expression and activates p38; siRNA-mediated CCM3 knockdown reduces p38 activation and decreases cell death.\",\n      \"method\": \"TUNEL assay, MTT assay, caspase-3 activation assay, siRNA knockdown, Western blot\",\n      \"journal\": \"Stroke\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays with WT vs disease mutants, single lab\",\n      \"pmids\": [\"19246713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PDCD10/CCM3 acts downstream of γ-protocadherins (PCDH-γ) to regulate neuronal survival; PCDH-γ isoforms interact with PDCD10 via their common cytoplasmic domain; RNAi knockdown of PDCD10 prevents apoptosis upon PCDH-γ depletion in chicken spinal neurons; overexpression of PDCD10 alone is sufficient to induce neuronal apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown (epistasis), overexpression, apoptosis assay in developing chicken spinal neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis in neurons with co-IP, single lab, two orthogonal methods\",\n      \"pmids\": [\"21041308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CCM3 silencing in endothelial cells downregulates core Notch signaling components (DLL4, Notch4, HEY2, HES1) and activates VEGF and ERK pathways, causing hyper-angiogenesis; restoration of DLL4-Notch signaling fully rescued the hyper-angiogenic phenotype, defining DLL4 as a key downstream target of CCM3.\",\n      \"method\": \"siRNA knockdown, recombinant DLL4 rescue, proliferation/migration/sprouting assays, RT-PCR, Western blot\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic rescue experiment establishing pathway order, single lab, multiple assays\",\n      \"pmids\": [\"23388056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCM3 suppresses endothelial stress fibers, Rho kinase (ROCK) activity, and vascular permeability; PDCD10 siRNA knockdown in endothelial cells increases stress fibers, ROCK activity, and permeability in vitro, and Pdcd10 heterozygous mice show greater CCM lesion burden than other Ccm genotypes.\",\n      \"method\": \"siRNA knockdown, stress fiber staining, ROCK activity assay, permeability assay, mouse models\",\n      \"journal\": \"Genetics in medicine : official journal of the American College of Medical Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal assays (biochemical + cellular + in vivo mouse), replicated concept across CCM literature\",\n      \"pmids\": [\"25122144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCM3 suppresses UNC13B- and VAMP3-dependent exocytosis of angiopoietin-2 (ANGPT2) in brain endothelial cells; CCM3 deficiency augments ANGPT2 secretion, causing destabilized endothelial junctions, enlarged lumens, and pericyte dissociation; UNC13B deficiency or ANGPT2-neutralizing antibody normalizes these defects in endothelial CCM3-deficient mice.\",\n      \"method\": \"Genetic KO mouse model, antibody neutralization, exocytosis assays, vessel imaging, co-IP\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and pharmacological rescue experiments in vivo, mechanistic pathway defined with multiple orthogonal approaches\",\n      \"pmids\": [\"27548575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCM3 deficiency in endothelial cells causes cell-autonomous, Wnt-receptor-independent stimulation of β-catenin transcriptional activity and endothelial-to-mesenchymal transition; TGF-β/BMP signaling is required for disease progression; sulindac sulfide and sulfone attenuate β-catenin activity and reduce vascular malformations in CCM3-deficient mice.\",\n      \"method\": \"Endothelial-cell-selective CCM3 knockout mice, luciferase reporter assays, pharmacological treatment, histology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-autonomous demonstration with conditional KO, defined signaling pathway, pharmacological rescue in vivo\",\n      \"pmids\": [\"26109568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCM3 depletion in brain endothelial cells causes cortactin Ser-phosphorylation via tonic ERK1/2 activation, leading to cortactin dissociation from ZO-1 and actin, redistribution to cytosol, and degradation; this disrupts cortical actin ring organization, tight junction complex stability, and causes constant barrier hyperpermeability; ERK1/2 inhibition restores cortactin and barrier function.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, Western blot, barrier permeability assay (inulin), ERK inhibitor treatment\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic pathway (CCM3→ERK1/2→cortactin→TJ) with pharmacological rescue, multiple orthogonal methods\",\n      \"pmids\": [\"26385474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM59 stabilizes PDCD10 by suppressing RNFT1-induced K63 polyubiquitination and subsequent p62/SQSTM1-selective autophagic degradation; PDCD10 mediates suppression of RhoA-ROCK1 signaling, controlling the transition between amoeboid and mesenchymal invasiveness in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, autophagy flux experiments, siRNA/shRNA knockdown, cell migration/invasion assays, ROCK inhibitor rescue\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ubiquitination mechanism defined with multiple orthogonal experiments, pathway rescue with ROCK inhibitor or PDCD10 overexpression\",\n      \"pmids\": [\"30408026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCM3 localizes to focal adhesion sites in cancer-associated fibroblasts and mutually competes with focal adhesion kinase (FAK) for binding to paxillin, fine-tuning FAK/Src/paxillin-driven mechanotransduction and YAP/TAZ activation; specific loss of CCM3 in cancer-associated fibroblasts increases tissue remodeling and exacerbates YAP/TAZ activation in neighboring tumor cells.\",\n      \"method\": \"Immunofluorescence/focal adhesion localization, co-immunoprecipitation (CCM3/FAK/paxillin competition), mouse breast cancer models, YAP/TAZ reporter assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — competition co-IP defining molecular mechanism plus in vivo mouse model validation with defined phenotypic readout\",\n      \"pmids\": [\"34226698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In C. elegans, CCM-3 and GCK-1 (GCKIII family kinase) work together to promote intercellular bridge stability and limit localization of anillin and non-muscle myosin II (NMM-II) to intercellular bridges; STRIPAK complex components striatin/CASH-1 and GCK-1 differentially control CCM-3 localization and function.\",\n      \"method\": \"C. elegans genetic knockdown/knockout, live imaging, biochemical analysis (STRIPAK complex)\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in C. elegans with live imaging and biochemical complex characterization, single lab\",\n      \"pmids\": [\"28285996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In C. elegans, CCM-3 is enriched at the luminal membrane and at contractile rings; loss of ccm-3 causes defective RAB-11-mediated endocytic recycling, disrupting gonadal lumen formation, cytokinesis completion, and cell-surface receptor localization; MO25 ortholog mop-25.2 is required for CCM-3 apical membrane localization.\",\n      \"method\": \"C. elegans genetic knockdown/knockout, fluorescence imaging, endocytic recycling assays\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and localization studies in C. elegans, conservation of STRIPAK complex shown biochemically\",\n      \"pmids\": [\"28285997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of Pdcd10 (but not Krit1) in gut epithelial cells disrupts the colonic mucosal barrier, and chemical disruption of the gut barrier or loss of Mucin-2 augments CCM formation in mouse models, establishing a gut-brain disease axis in which PDCD10 is required for both brain endothelial signaling and gut epithelial barrier function; dexamethasone inhibits CCM formation by acting at both cell types.\",\n      \"method\": \"Tissue-specific conditional KO mice, gut permeability assays, pharmacological treatment, CCM lesion burden quantification\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific genetic dissection in mice with defined barrier readout and pharmacological rescue, multiple orthogonal in vivo approaches\",\n      \"pmids\": [\"31776290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Pdcd10 knockout in kidney tubules causes polyuria; total and phosphorylated AQP2 protein levels at the apical membrane are decreased despite normal Aqp2 mRNA, associated with increased ERM protein expression and impaired intracellular vesicle trafficking; erlotinib (promoting exocytosis/inhibiting endocytosis) partially rescues water reabsorption defects, identifying a PDCD10-STK24/25-ERM signaling pathway regulating vesicle trafficking and AQP2 membrane targeting.\",\n      \"method\": \"Kidney-specific conditional KO mice, immunofluorescence/fractionation for AQP2 localization, pharmacological rescue (erlotinib), Western blot\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with defined molecular mechanism (vesicle trafficking→AQP2 localization) and pharmacological rescue in vivo\",\n      \"pmids\": [\"34156031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCM3 deletion in lymphatic endothelial cells augments VEGFR3-ERK1/2 signaling driving lymphatic hyperplasia; mechanistically, CCM3 binds importin alpha 2/KPNA2, and CCM3 deletion releases KPNA2 to activate NF-κB p65 nuclear translocation and p65-dependent VEGFR3 transcription; inhibition of VEGFR3 or ERK1/2 rescues lymphatic defects.\",\n      \"method\": \"Lymphatic-specific conditional KO mice, co-immunoprecipitation (CCM3-KPNA2), NF-κB nuclear translocation assay, VEGFR3/ERK1/2 inhibitor rescue, lymphatic function assays\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP defining CCM3-KPNA2 interaction plus conditional KO with pharmacological rescue, multiple orthogonal methods\",\n      \"pmids\": [\"34670407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In a brain endothelial-specific Pdcd10-knockout (Pdcd10BECKO) mouse model, CCM lesions initiate from capillary/post-capillary venule protrusions with pericyte dissociation; caveolae are drastically increased in Pdcd10BECKO endothelium, enhancing Tie2 signaling; genetic deletion of caveolin-1 or pharmacological Tie2 blockade normalizes microvascular structure and reduces CCM lesion formation.\",\n      \"method\": \"Brain EC-specific conditional KO mice, two-photon microscopy, caveolin-1 KO epistasis, Tie2 inhibitor treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (caveolin-1 KO) plus pharmacological rescue establishing caveolae-Tie2 pathway, in vivo imaging\",\n      \"pmids\": [\"33495460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CCM3 loss leads to RhoA activation, alterations in actin and microtubule cytoskeleton affecting neuronal morphology, and abnormalities in laminar positioning of late-born neurons in the neocortex; CCM3 is specifically required in radial glia and newly born pyramidal neurons for radial glia-dependent locomotion, with possible interaction with the Cdk5/RhoA pathway.\",\n      \"method\": \"Cell-type-specific conditional KO mice (radial glia/neuron-specific), RhoA activity assay, cytoskeletal immunostaining, cortical lamination analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with defined RhoA/cytoskeletal readout and layer-specific phenotype\",\n      \"pmids\": [\"24595293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PDCD10 associates with MST4 kinase (demonstrated by proximity ligation assay), translocates it intracellularly, and thereby facilitates phosphorylation of RB and ERK1/2; in pancreatic cancer cells, PDCD10 promotes TGF-β-driven proliferation by inactivating RB via a SMAD4-dependent pathway and promotes EMT by increasing ERK1/2 activation via a non-SMAD4 pathway.\",\n      \"method\": \"Proximity ligation assay, PDCD10 knockout cell lines (CRISPR), Western blot, viability and migration assays, organoid models\",\n      \"journal\": \"Clinical science (London, England : 1979)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PLA for protein association plus CRISPR KO with defined signaling readouts, single lab\",\n      \"pmids\": [\"39212293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCM3 silencing in endothelial cells upregulates EphB4 mRNA, protein, and kinase activity and activates ERK1/2; EphB4 kinase inhibitor (NVP-BHG712) reverses the hyper-angiogenic phenotype, placing EphB4 downstream of CCM3/DLL4-Notch signaling in the pathway: CCM3→DLL4/Notch→EphB4→ERK1/2.\",\n      \"method\": \"siRNA knockdown, EphB4 kinase inhibitor treatment, in vitro and in vivo angiogenesis assays, RT-PCR, Western blot\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis defining pathway order, single lab, multiple assays\",\n      \"pmids\": [\"28371279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CCM3 knockdown in endothelial cells induces activation and nuclear translocation of YAP/TAZ; YAP/TAZ inhibitor verteporfin reverses the pro-angiogenic effects of CCM3 silencing (proliferation, migration, tube formation, VEGF/VEGFR2 upregulation), establishing CCM3 as a regulator of the Hippo/YAP-TAZ pathway in angiogenesis.\",\n      \"method\": \"siRNA knockdown, YAP/TAZ nuclear translocation assay, verteporfin pharmacological rescue, HUVEC functional assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological rescue establishing pathway dependency, single lab, mechanistic readout confirmed\",\n      \"pmids\": [\"38320423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In zebrafish, ccm3 deficiency causes cardiovascular phenotypes distinct from ccm1/ccm2 loss; ccm3 (but not ccm2) defects can be rescued by overexpression of stk25b (GCKIII kinase); morpholino knockdown of stk25b phenocopies ccm3 morphants; double knockdown of ccm3 and ccm2 shows synergistic vessel dilation, supporting a model where CCM3 acts via GCKIII activity in a pathway distinct from CCM1/CCM2.\",\n      \"method\": \"Zebrafish morpholino knockdown, genetic rescue (stk25b overexpression), phenotypic analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis by rescue and double-knockdown in zebrafish, consistent with mammalian data from other labs\",\n      \"pmids\": [\"22182521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of Pdcd10 in ureter urothelium causes hypertrophy, increased expression of uroplakins and keratins, modification of intracellular membrane systems (vesicle trafficking defects), swelling of Golgi compartments, disruption of mitochondrial cristae, increased lysosomal fusion, decreased fusiform vesicle formation, and increased exosome secretion, indicating PDCD10 regulates endomembrane trafficking and organelle biogenesis in epithelial cells.\",\n      \"method\": \"Conditional KO mice (Cdh16-Cre), immunocytochemistry, confocal and electron microscopy, mRNA expression analysis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with ultrastructural validation, single lab\",\n      \"pmids\": [\"38037455\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PDCD10/CCM3 is a scaffold/adaptor protein that operates within the STRIPAK complex and in complex with GCKIII kinases (MST4, STK24, STK25); it stabilizes GCKIII kinase levels and activity, regulates ERK/Rho/ROCK signaling to control endothelial barrier integrity, cytoskeletal organization, vesicle trafficking (including AQP2 and angiopoietin-2 exocytosis), and mechanotransduction via a FAT-homology domain that competes with FAK for paxillin binding at focal adhesions; disease-causing mutations disrupt these protein–protein interactions and downstream signaling, leading to vascular malformations.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PDCD10/CCM3 is an all-alpha-helical scaffold/adaptor protein that organizes germinal center kinase III (GCKIII) signaling to control endothelial and epithelial barrier integrity, cytoskeletal organization, and membrane trafficking [#0, #4, #7]. It resides within the STRIPAK phosphatase-kinase complex and binds the GCKIII kinases MST4, STK24, and STK25 through its N-terminal dimerization domain, which heterodimerizes with the kinase C-terminal tail using the same surface that mediates CCM3 homodimerization [#0, #7, #9]; through these interactions CCM3 stabilizes GCKIII protein levels and potentiates their kinase activity toward substrates including the ERM proteins ezrin/radixin/moesin [#2, #5, #10, #11]. CCM3 additionally assembles with CCM1/CCM2 (scaffolded by full-length CCM2) and, via the conserved HP1 pocket of its C-terminal FAT-homology domain, binds paxillin LD motifs at focal adhesions, where it competes with focal adhesion kinase to tune FAK/Src/paxillin mechanotransduction and YAP/TAZ activation [#1, #3, #4, #8, #21]. In endothelium, loss of CCM3 disrupts barrier function through multiple convergent routes: tonic ERK1/2 activation that destabilizes cortactin and tight junctions, RhoA/ROCK-driven stress fiber formation, increased UNC13B/VAMP3-dependent angiopoietin-2 exocytosis, caveolae-Tie2 signaling, suppression of DLL4-Notch with downstream EphB4/VEGF activation, and Wnt-independent beta-catenin activation driving endothelial-to-mesenchymal transition [#16, #17, #18, #19, #27, #30]. PDCD10 also regulates vesicle trafficking and organelle organization, controlling AQP2 membrane targeting in kidney tubules and endomembrane/Golgi integrity in epithelia [#5, #25, #33], and contributes to apoptotic control downstream of gamma-protocadherins [#14]. CCM3 protein abundance is itself controlled by ubiquitin-dependent turnover, with TRIM59 antagonizing RNFT1-mediated K63 polyubiquitination and p62-selective autophagic degradation [#20]. Loss-of-function disrupts these protein interactions and signaling outputs, producing cerebral cavernous malformations, a disease in which Pdcd10 acts both in brain endothelium and, through a gut-brain axis, in gut epithelial barrier maintenance [#5, #6, #16, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing CCM3 as a direct binding partner and substrate of GCKIII kinases defined it as a kinase-associated adaptor rather than a standalone effector, and linked it physically to the other CCM proteins.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, in vitro kinase/phosphatase assays and functional knockdown/overexpression with ERK readout for STK25 and MST4\",\n      \"pmids\": [\"17657516\", \"17360971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which GCKIII activities are physiologically dominant in vivo\", \"Phosphorylation site function on CCM3 not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placing a large fraction of CCM3 within the STRIPAK complex established its biochemical context as a hub coupling PP2A phosphatase activity to GCKIII kinases, and a mutant CCM2 experiment defined CCM2 as the core scaffold of the CCM1/CCM2/CCM3 trimer.\",\n      \"evidence\": \"Iterative AP-MS for STRIPAK membership; co-IP of CCM2 deletion mutant for trimer architecture\",\n      \"pmids\": [\"18782753\", \"18300272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics of CCM3 within STRIPAK not defined\", \"How CCM3 partitions between STRIPAK and the CCM1/2/3 complex unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The crystal structure of CCM3 partitioned its functions into an N-terminal dimerization domain and a C-terminal FAT-homology domain whose HP1 pocket mediates CCM2 binding and focal-adhesion/paxillin colocalization, providing a structural basis for distinct interaction modes.\",\n      \"evidence\": \"X-ray crystallography at 2.5 A with HP1-mutant co-IP and colocalization\",\n      \"pmids\": [\"20489202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine GCKIII binding surface (resolved later)\", \"Functional consequence of homo- vs heterodimer switching unaddressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Loss-of-function and rescue experiments demonstrated that CCM3 stabilizes GCKIII kinases and maintains Golgi integrity, cell migration, and endothelial barrier function, with disease mutants failing to bind GCKIII kinases and failing to rescue.\",\n      \"evidence\": \"siRNA knockdown, co-IP, wound-healing assays in cells, and zebrafish morpholino epistasis with Rho/moesin and barrier assays; disease-mutant rescue tests\",\n      \"pmids\": [\"20332113\", \"20592472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling GCKIII stabilization to Golgi and barrier phenotypes incompletely defined\", \"Cell type specificity of these effects not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapping the GCKIII-binding surface to the N-terminal dimerization domain showed CCM3 preferentially heterodimerizes with GCKIII kinases over homodimerizing, defining the molecular logic of the CCM3-kinase module.\",\n      \"evidence\": \"Domain-truncation binding assays and sequence analysis\",\n      \"pmids\": [\"21561863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not quantify homo/hetero equilibrium in cells\", \"Regulation of the switch not addressed (resolved structurally in 2013)\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Structural definition of CCM3-paxillin LD-motif binding via the HP1 FAT surface, with micromolar affinity and pericyte colocalization, established a direct CCM3 link to focal adhesion biology.\",\n      \"evidence\": \"Multiple crystal structures, SPR affinity measurement, and immunofluorescence colocalization in cerebral pericytes\",\n      \"pmids\": [\"21632544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of paxillin binding not yet established (addressed in 2021)\", \"Competition with other LD-motif partners not tested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conditional in vivo deletion separated cell-autonomous (Akt activation, proliferation/survival) from non-cell-autonomous vascular consequences, framing CCM3 loss as engaging multiple signaling axes including PKA and Rho-GTPase.\",\n      \"evidence\": \"Neural-cell-specific conditional KO mice with IHC, RNA-seq, and Western blot\",\n      \"pmids\": [\"21321212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from Akt to vascular lesions not dissected\", \"Direct CCM3 effector for Akt activation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The CCM3-MST4 complex crystal structure revealed a flexible-linker-driven conformational rotation enabling homodimer disassembly and heterodimer formation, tying the structural switch to kinase-activity-dependent proliferation and migration.\",\n      \"evidence\": \"X-ray crystallography with in vivo co-IP and kinase-inhibitor-dependent functional assays\",\n      \"pmids\": [\"23541896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger controlling the conformational switch in cells unknown\", \"Whether STRIPAK regulates this transition unaddressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating CCM3-dependent, MST4-driven ERM phosphorylation under oxidative stress and STK25 protein stabilization connected the CCM3-GCKIII module to stress responses and cell survival.\",\n      \"evidence\": \"siRNA knockdown, phospho-ERM Western blot, proteasome inhibition, and viability/apoptosis assays under H2O2\",\n      \"pmids\": [\"22291017\", \"22652780\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab apoptosis findings with limited mechanistic depth (idx 11)\", \"Direction of CCM3 effect on cell death context-dependent and unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Conditional KO in radial glia and neurons showed CCM3 controls RhoA activity and cytoskeletal organization required for neuronal migration and cortical lamination, generalizing its cytoskeletal regulatory role beyond endothelium.\",\n      \"evidence\": \"Cell-type-specific conditional KO mice, RhoA activity assays, cytoskeletal staining, lamination analysis\",\n      \"pmids\": [\"24595293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct link to Cdk5/RhoA not biochemically established\", \"GCKIII dependence of the neuronal phenotype untested here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Endothelial-specific studies defined two distinct barrier-disrupting mechanisms downstream of CCM3 loss: ERK1/2-driven cortactin destabilization of tight junctions, and Wnt-independent beta-catenin activation driving endothelial-to-mesenchymal transition, both pharmacologically rescuable.\",\n      \"evidence\": \"siRNA and conditional KO mice, barrier permeability assays, luciferase reporters, ERK inhibitor and sulindac rescue\",\n      \"pmids\": [\"26385474\", \"26109568\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CCM3 loss elevates tonic ERK1/2 not fully defined\", \"Relationship between the cortactin and beta-catenin arms unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linking CCM3 loss to RhoA/ROCK-driven permeability and to UNC13B/VAMP3-dependent angiopoietin-2 exocytosis, with in vivo genetic and antibody rescue, established trafficking-level control of endothelial junction stability.\",\n      \"evidence\": \"siRNA, ROCK and permeability assays, mouse genetics, exocytosis assays, UNC13B KO and ANGPT2-neutralizing antibody rescue\",\n      \"pmids\": [\"25122144\", \"27548575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting CCM3 to the exocytic machinery not defined at molecular level\", \"Relative contribution of ROCK vs ANGPT2 arms in vivo unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defining a TRIM59/RNFT1 ubiquitin and p62-autophagy axis that sets PDCD10 abundance, and showing PDCD10 suppresses RhoA-ROCK1 to control cancer cell invasion mode, established post-translational control of CCM3 levels and a role in tumor cell biology.\",\n      \"evidence\": \"Co-IP, ubiquitination and autophagy-flux assays, knockdown, invasion assays with ROCK inhibitor rescue in breast cancer cells\",\n      \"pmids\": [\"30408026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where this turnover operates not mapped\", \"Whether endothelial CCM3 levels are similarly regulated untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Invertebrate genetics extended the CCM3-GCKIII partnership to intercellular bridge stability and RAB-11-mediated endocytic recycling, establishing conserved roles in cytokinesis, lumen formation, and membrane trafficking with STRIPAK-dependent localization control.\",\n      \"evidence\": \"C. elegans knockdown/knockout, live imaging, recycling assays, biochemical STRIPAK characterization\",\n      \"pmids\": [\"28285996\", \"28285997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conservation of the recycling role in mammalian endothelium not directly shown\", \"Single-organism findings (idx 22, 23)\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Tissue-specific KO revealed that Pdcd10, unlike Krit1, is required for the colonic mucosal barrier, defining a gut-brain disease axis in which gut epithelial integrity modulates brain cavernous malformation burden.\",\n      \"evidence\": \"Tissue-specific conditional KO mice, gut permeability assays, Mucin-2 manipulation, dexamethasone rescue\",\n      \"pmids\": [\"31776290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of CCM3 function in gut epithelium not defined\", \"How gut signals reach brain endothelium unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A series of conditional KO and interaction studies broadened CCM3 to lymphatic, renal, mechanosensing, and caveolar contexts—binding KPNA2 to restrain NF-kB/VEGFR3, controlling AQP2 trafficking via STK24/25-ERM, competing with FAK for paxillin to tune YAP/TAZ, and restraining caveolae-Tie2 signaling.\",\n      \"evidence\": \"Conditional KO mice in lymphatic/kidney/brain endothelium and cancer-associated fibroblasts, co-IP (KPNA2, FAK/paxillin), two-photon imaging, caveolin-1 KO epistasis, and pharmacological rescues\",\n      \"pmids\": [\"34670407\", \"34156031\", \"34226698\", \"33495460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these tissue-specific mechanisms share a unifying biochemical step is unclear\", \"Direct structural basis of FAK competition not solved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Additional tumor and angiogenesis studies positioned PDCD10 as a regulator of MST4-mediated RB/ERK phosphorylation in pancreatic cancer and of Hippo/YAP-TAZ in endothelium, reinforcing its adaptor role across proliferative and angiogenic programs.\",\n      \"evidence\": \"Proximity ligation assay, CRISPR KO, organoid models, and siRNA with verteporfin rescue\",\n      \"pmids\": [\"39212293\", \"38320423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab signaling readouts (idx 29, 31)\", \"Direct vs indirect control of YAP/TAZ in endothelium not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CCM3 dynamically partitions between STRIPAK, the CCM1/2/3 complex, GCKIII heterodimers, and focal-adhesion paxillin to select among its many downstream pathways in a given cell type remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking complex membership to pathway choice\", \"Spatiotemporal regulation of the homo/heterodimer switch in vivo unknown\", \"Quantitative flux between STRIPAK-bound and free CCM3 pools undetermined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 7, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 10, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [8, 16, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5, 33]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [8, 21]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [16, 19, 28]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [10, 23, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [\"STRIPAK\", \"CCM1/CCM2/CCM3 complex\", \"CCM3-GCKIII (MST4/STK24/STK25) heterodimer\"],\n    \"partners\": [\"STK25\", \"MST4\", \"STK24\", \"CCM2\", \"PXN\", \"FAK\", \"KPNA2\", \"PTPN13\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}