{"gene":"ROCK2","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2006,"finding":"ROCK2 localizes to the nucleus where it associates with and phosphorylates p300 acetyltransferase both in vitro and in cells; nuclear-restricted constitutively active ROCK2 induces p300 phosphorylation, and p300 phosphorylation by ROCK2 increases its acetyltransferase activity in vitro.","method":"Co-immunoprecipitation, gel filtration, immunofluorescence colocalization, in vitro kinase assay, nuclear-restricted constitutively active ROCK2 expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with functional readout (acetyltransferase activity) plus reciprocal co-IP and cell-based validation in one study","pmids":["16574662"],"is_preprint":false},{"year":2009,"finding":"ROCK2 acts as a negative regulator of TGF-β signaling by binding to TGF-β type I receptors and accelerating their lysosomal degradation after internalization from the cell surface; this inhibitory effect requires ROCK2 kinase activity.","method":"Co-immunoprecipitation, receptor degradation assays, kinase-dead mutant analysis, zebrafish mRNA injection and dominant-negative overexpression","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — binding/degradation mechanism established in mammalian cells with kinase-dead mutant validation, plus in vivo zebrafish epistasis","pmids":["19509062"],"is_preprint":false},{"year":2008,"finding":"ROCK2 knockout mice show deficits in dendritic spine morphology, synapse density, basal synaptic transmission, and hippocampal LTP, associated with deficits in actin cytoskeleton organization and cofilin phosphorylation, indicating ROCK2/cofilin signaling is required for neuronal actin regulation and synaptic function.","method":"Genetic knockout mouse model, electrophysiology (LTP), spine morphometry, cofilin phosphorylation western blot","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with multiple orthogonal phenotypic readouts (electrophysiology, morphometry, biochemistry)","pmids":["18718479"],"is_preprint":false},{"year":2013,"finding":"In ROCK2-/- MEFs, ROCK2 is required for stabilizing the actin cytoskeleton through regulating cofilin phosphorylation; ROCK2 loss results in reduced phosphorylation of both MLC2 and cofilin, increased peripheral membrane folding, and impaired cell adhesion.","method":"ROCK2 knockout MEFs, actin cytoskeleton imaging, MLC2 and cofilin phosphorylation western blot, cell adhesion and detachment assays","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isoform-specific knockout with multiple orthogonal biochemical and cell biological readouts","pmids":["23392171"],"is_preprint":false},{"year":2010,"finding":"During ouabain-induced apoptosis in HUVECs, ROCK2 is cleaved by caspase-2, generating a ~140 kDa fragment corresponding to a novel caspase-2 cleavage site on the carboxy terminus of ROCK2; this cleavage is prevented by the caspase-2 inhibitor z-VDVAD-fmk.","method":"Caspase inhibitor treatment (z-DEVD-fmk, z-VDVAD-fmk), western blot for ROCK2 cleavage fragments","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, pharmacological inhibitor approach identifying cleavage fragment without direct mutagenesis validation","pmids":["20661774"],"is_preprint":false},{"year":2012,"finding":"ROCK2 directly binds Cdc25A, regulates cell cycle progression at G1/S by preventing Cdc25A ubiquitination and degradation; knockdown of ROCK2 activates Cdc25A ubiquitination and promotes its degradation in hepatocellular carcinoma cells.","method":"Co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown, ubiquitination assay, flow cytometry cell cycle analysis","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Weak — reciprocal co-IP and ubiquitination assay but single lab, limited mechanistic detail in abstract","pmids":["22705122"],"is_preprint":false},{"year":2014,"finding":"ROCK2 stabilizes MMP2 by preventing its ubiquitination and degradation in hepatocellular carcinoma, thereby promoting invasion and metastasis.","method":"siRNA knockdown, ubiquitination assay, rescue experiments with MMP2 re-expression, invasion/migration assays in vitro and in vivo","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, ubiquitination assay plus functional rescue, but no direct in vitro reconstitution","pmids":["25251472"],"is_preprint":false},{"year":2014,"finding":"ROCK2 is a positive regulator of the p42/p44 MAPK–p90RSK–eEF2 signaling pathway in myogenic cells and controls hypertrophic responses to IGF-1 and insulin; an alternatively spliced muscle-specific isoform ROCK2m is preferentially expressed in skeletal muscle and strongly upregulated during differentiation.","method":"Specific siRNA knockdown of ROCK2 or ROCK2m in C2C12 cells, western blot for MAPK/RSK/eEF2 pathway components, myogenic differentiation markers","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — isoform-specific knockdown with biochemical pathway readout, two isoforms distinguished, single lab","pmids":["17606625"],"is_preprint":false},{"year":2014,"finding":"KAP (cyclin-dependent kinase-associated phosphatase) binds and activates ROCK2; RNA-mediated downregulation of KAP leads to decreased ROCK2 activity, which in turn increases Rac1-mediated glioblastoma invasion.","method":"Co-immunoprecipitation, ROCK2 activity assays, siRNA knockdown, invasion assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Weak — binding established by co-IP with functional activity readout, single lab","pmids":["24704824"],"is_preprint":false},{"year":2014,"finding":"The RNA-binding protein Rbfox2 regulates ROCK2 alternative splicing during myogenesis; the specific ROCK2 splicing isoform generated is required for myoblast fusion, and restored ROCK2 activity rescues myoblast fusion in Rbfox2-depleted cultures.","method":"RNA-seq, iCLIP, Rbfox2 knockdown, rescue with ROCK2 re-expression, myoblast fusion assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — iCLIP direct binding data combined with functional rescue in defined cellular assay, multiple orthogonal methods","pmids":["25087874"],"is_preprint":false},{"year":2014,"finding":"ROCK2 directly phosphorylates PKCβ2 at Thr641 in vitro, forming a physical complex; over-activation of ROCK2 in the diabetic heart leads to PKCβ2 activation and interferes with PDK-1/AKT-mediated GLUT4 translocation.","method":"In vitro kinase assay, reciprocal co-immunoprecipitation, siRNA knockdown, GLUT4 translocation confocal microscopy, western blot from diabetic rat hearts","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro phosphorylation at defined residue combined with reciprocal co-IP and cell-based validation","pmids":["24466133"],"is_preprint":false},{"year":2015,"finding":"ROCK2 stabilizes β-catenin by preventing its ubiquitination and degradation in colorectal cancer cells, thereby promoting invasion and metastasis via the β-catenin/TCF4 pathway.","method":"siRNA knockdown, ubiquitination assay, β-catenin stability assays, in vitro and in vivo invasion assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, ubiquitination assay without direct reconstitution of the stabilization mechanism","pmids":["26505794"],"is_preprint":false},{"year":2015,"finding":"ROCK2 promotes HCC cell proliferation through a Rock2–p-GSK3β–β-catenin–CEBPD regulatory axis, in which ROCK2 phosphorylates GSK3β to activate β-catenin signaling and suppress the tumor suppressor CEBPD.","method":"ROCK2 knockdown, western blot for p-GSK3β/β-catenin/CEBPD, in vitro and in vivo proliferation assays","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, inferred pathway placement from knockdown/western blot without direct kinase assay on GSK3β","pmids":["25771860"],"is_preprint":false},{"year":2016,"finding":"ROCK2 (but not ROCK1) specifically drives LPA-induced expression of MCP-1 and E-selectin in human aortic endothelial cells via NF-κB RelA/p65 nuclear translocation, controlling monocyte chemotaxis and monocyte–endothelial adhesion.","method":"siRNA isoform-selective knockdown, NF-κB nuclear translocation assay, monocyte migration and adhesion assays, IκBα phosphorylation western blot","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific knockdown with multiple functional readouts and defined pathway placement, single lab","pmids":["30884801"],"is_preprint":false},{"year":2016,"finding":"ROCK2 (but not ROCK1) activates JAK2/STAT3 signaling through increased IL-6 expression and upregulation of IKKβ/NF-κB transcription, forming a positive feedback loop that confers chemoresistance in hepatocellular carcinoma; IKKβ is identified as a direct downstream target of ROCK2.","method":"siRNA isoform-specific knockdown, ROCK2 overexpression, western blot for JAK2/STAT3/IKKβ/NF-κB, in vitro and in vivo chemoresistance assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — isoform discrimination with pathway biochemistry, single lab, no direct kinase assay on IKKβ","pmids":["27213590"],"is_preprint":false},{"year":2016,"finding":"ROCK2 (but not ROCK1) mediates acid-induced upregulation of NOX5-S expression and H2O2 production in esophageal adenocarcinoma cells; constitutively active ROCK2 enhances NOX5-S expression, and this activation is dependent on intracellular calcium increase.","method":"ROCK isoform-specific siRNA knockdown, constitutively active ROCK2/ROCK1 overexpression, ROCK activity assay, calcium chelation experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform discrimination using both knockdown and constitutively active constructs with mechanistic calcium link, single lab","pmids":["26901778"],"is_preprint":false},{"year":2017,"finding":"Rock2 is an APC/C-Cdh1 ubiquitin ligase substrate in neurons; Cdh1 conditional knockout leads to Rock2 protein accumulation in the cortex and hippocampus, and pharmacological Rock inhibition with fasudil rescues dendritic network disorganization, memory loss, and neurodegeneration in these mice.","method":"Cdh1 conditional knockout mouse, Rock2 protein level measurement, in vivo fasudil treatment, dendritic morphometry, memory behavioral tests","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic identification of ROCK2 as APC/CCdh1 substrate in vivo with functional rescue by ROCK inhibition, multiple orthogonal readouts","pmids":["28396402"],"is_preprint":false},{"year":2017,"finding":"Fibroblast-specific ROCK2 deletion reduces angiotensin II-stimulated cardiac hypertrophy and fibrosis; mechanistically, ROCK2 knockdown in cardiac fibroblasts decreases expression of CTGF and secretion of FGF2, and conditioned media from ROCK2-knockdown fibroblasts elicits less cardiomyocyte hypertrophy.","method":"Fibroblast-specific ROCK2 conditional knockout mice, Ang II treatment, echocardiography, CTGF/FGF2 expression, conditioned media cardiomyocyte hypertrophy assay","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific genetic deletion with conditioned media experiments providing paracrine mechanism, multiple orthogonal readouts","pmids":["28679962"],"is_preprint":false},{"year":2018,"finding":"Cocrystal structures of dual ROCK1 and ROCK2 inhibitors identified Asp176 and Asp218 in ROCK2 (corresponding to Glu residues in PKA) as key residues that can be targeted to drive both potency and kinome selectivity.","method":"X-ray cocrystal structures of inhibitor-bound ROCK1 and ROCK2","journal":"Journal of medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures directly identifying active-site residues distinguishing ROCK2 from PKA","pmids":["30384606"],"is_preprint":false},{"year":2019,"finding":"ROCK2 inhibition triggers collective invasion of colorectal adenocarcinoma cells by inducing leader/follower polarization of cell cohorts; FARP2 (a Rac1 GEF) is necessary downstream of ROCK2 inhibition for invasion, and concomitant inhibition of Myosin-II is required alongside ROCK2 inhibition to trigger leader cell formation.","method":"siRNA screens targeting Rho-GTPase effectors and GEFs, 3D organotypic Caco-2 cyst cultures, pharmacological myosin-II inhibition, live ex vivo invasion assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-scale siRNA screens with orthogonal pharmacological validation, ex vivo human tissue confirmation, single lab","pmids":["31304629"],"is_preprint":false},{"year":2019,"finding":"ROCK2 stabilizes PFKFB3 by modifying its ubiquitination and degradation, thereby promoting glycolysis and osteosarcoma proliferation and metastasis.","method":"siRNA knockdown, ubiquitination assay, PFKFB3 rescue experiments, in vitro and in vivo proliferation/invasion assays","journal":"Experimental cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, indirect ubiquitination assay without direct reconstitution of kinase-substrate relationship","pmids":["31678169"],"is_preprint":false},{"year":2019,"finding":"ROCK2 disrupts MKP1 at two levels: it activates ERK1/2-ATF2 signaling to increase MKP1 mRNA expression, while simultaneously promoting ERK1/2-dependent ubiquitin-mediated MKP1 protein degradation, net result being decreased MKP1 protein and promoted HCC metastasis.","method":"ROCK2 knockdown, western blot for MKP1 protein and mRNA, ERK1/2 pathway analysis, ubiquitination assay","journal":"American journal of cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, pathway inference from knockdown with no direct kinase assay linking ROCK2 to ERK or ATF2","pmids":["32266097"],"is_preprint":false},{"year":2019,"finding":"ROCK2 promotes cardiomyocyte arrhythmic calcium release in diabetic hearts by promoting CaMKII-mediated phosphorylation of the ryanodine receptor (RyR); ROCK2+/- diabetic mice show decreased CaMKII and RyR phosphorylation and reduced diastolic Ca2+ leak.","method":"ROCK2+/- mice, streptozotocin-diabetic model, Ca2+ transient imaging, CaMKII and RyR phosphorylation western blot, pharmacological ROCK inhibition (Y-27632)","journal":"International journal of cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic haploinsufficiency combined with pharmacological inhibition and biochemical phosphorylation analysis, single lab","pmids":["30728103"],"is_preprint":false},{"year":2019,"finding":"ROCK2 disruption in cardiomyocytes leads to reduced MLC and FAK phosphorylation; ROCK2 single knockout causes compensatory ROCK1 overactivation with increased p-MLC and p-FAK, inhibited autophagy via increased mTOR activity, and increased cardiac fibrosis, whereas double ROCK1/ROCK2 knockout promotes autophagy via reduced AKT/mTOR/ULK1 signaling.","method":"Cardiomyocyte-specific tamoxifen-inducible ROCK knockout mice, western blot for MLC/FAK/AKT/mTOR/ULK1 phosphorylation, LC3B autophagy marker, cardiac histology","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic mouse lines (single and double KO) with defined compensatory mechanism and multiple biochemical readouts, single lab","pmids":["30848941"],"is_preprint":false},{"year":2019,"finding":"ROCK2 inhibition enhances beige adipogenesis in white adipose tissue; ROCK2 activity-mediated actin cytoskeleton dynamics suppress thermogenic gene expression, and selective ROCK2 inhibition (KD025) or ROCK2 haploinsufficiency in vivo reproduces the pro-beige phenotype.","method":"ROCK2+/- and ROCK2 kinase-dead knock-in mice, high-fat diet model, adipose tissue histology, thermogenic gene expression, KD025 treatment of differentiated stromal-vascular cells","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two complementary genetic models plus pharmacological validation, single lab","pmids":["31914704"],"is_preprint":false},{"year":2020,"finding":"ROCK2 is activated in germinal center (GC) B cells by CD40 and IL-21 signals; ROCK2 regulates GC formation and maintains a transcriptional program for GC polarization and cholesterol biosynthesis by: (1) restraining AKT activation to enhance FOXO1 activity, and (2) directly phosphorylating IRF8 to promote its interaction with SREBP2 at cholesterol biosynthetic gene regulatory regions.","method":"B cell-specific ROCK2 deletion, RNA-seq, ATAC-seq, biochemical IRF8 phosphorylation assays, ChIP for SREBP2 recruitment","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct phosphorylation of IRF8 identified, ATAC-seq/ChIP confirmed downstream chromatin effects, multiple orthogonal genomic and biochemical methods","pmids":["32229726"],"is_preprint":false},{"year":2020,"finding":"ROCK2 affects osteosarcoma progression and TRAIL resistance by modifying O-GlcNAcylation through stabilization of O-GlcNAc transferase (preventing its degradation).","method":"ROCK2 silencing, proteomics analysis, O-GlcNAc transferase expression and ubiquitination analysis, apoptosis assays","journal":"American journal of cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, mechanism inferred from proteomics without direct reconstitution of kinase-OGT interaction","pmids":["32266091"],"is_preprint":false},{"year":2021,"finding":"ROCK2 directly inhibits Parkin-dependent mitophagy; ROCK2 inhibition promotes mitophagy through this pathway, providing a mechanism for neuroprotection in neurodegenerative disease models.","method":"Pharmacological ROCK2 inhibition, mitophagy pathway analysis (reviewed with supporting experimental citations)","journal":"Neuroscience and biobehavioral reviews","confidence":"Low","confidence_rationale":"Tier 4 / Weak — review paper synthesizing evidence; no direct primary experiment in this paper","pmids":["36122738"],"is_preprint":false},{"year":2021,"finding":"ROCK2 inhibition in macrophages directly disrupts STAT3/cofilin signaling, inhibiting pro-inflammatory cytokine production and macrophage migration; in vivo ROCK2 inhibition reduces STAT3 phosphorylation and cofilin levels in fibrotic liver.","method":"Selective ROCK2 inhibitor KD025 treatment in vitro and in vivo, western blot for STAT3/cofilin phosphorylation, macrophage migration and cytokine assays, thioacetamide liver fibrosis model","journal":"JHEP reports : innovation in hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined biochemical pathway with in vitro and in vivo validation, single lab","pmids":["34917911"],"is_preprint":false},{"year":2021,"finding":"Fibroblast deletion of ROCK2 specifically reduces TGF-β1/Smad2 signaling and cardiac fibroblast activation; ROCK2 mediates cardiac fibrosis through the TGF-β1/Smad2 pathway.","method":"ROCK2 siRNA knockdown, belumosudil treatment, western blot for Smad2 phosphorylation, cardiac fibroblast activation assays, TAC mouse model","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — siRNA and pharmacological inhibition with defined pathway readout, in vivo validation, single lab","pmids":["35657612"],"is_preprint":false},{"year":2022,"finding":"ROCK2 serves as a suppressor of PPARα transcription in podocytes, rewiring cellular metabolism by negatively controlling transcription of genes involved in fatty acid oxidation, which induces podocyte apoptosis in diabetic conditions.","method":"Podocyte-specific ROCK2 knockout mice, RNA-sequencing of ROCK2-null podocytes, multiple diabetic mouse models (STZ, db/db, HFD), albuminuria and fibrosis readouts","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific genetic deletion with RNA-seq identifying direct transcriptional suppression target, validated across multiple disease models","pmids":["35396346"],"is_preprint":false},{"year":2022,"finding":"ROCK2 enhances homologous recombination (HR) repair in TMZ-resistant glioma cells by upregulating ATM expression through promoting binding of ZEB1 (converted to transcriptional activator by YAP1) to the ATM promoter.","method":"ROCK2 silencing, HR assay, ATM expression analysis, ZEB1/YAP1 interaction studies, ChIP for ZEB1 binding to ATM promoter","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — ChIP and molecular mechanism defined but single lab, abstract does not detail all controls","pmids":["35145081"],"is_preprint":false},{"year":2023,"finding":"ROCK2 associates with p22phox in human monocytes (but not neutrophils) via interaction between the cytosolic region of p22phox (aa 132–195) and the coiled-coil region of ROCK2 (aa 400–967); ROCK2 phosphorylates p47phox on Ser304, Ser315, Ser320, and Ser328 in vitro but does not phosphorylate p22phox, p40phox, p67phox, or gp91phox, thereby controlling NADPH oxidase activation in monocytes.","method":"Reciprocal co-immunoprecipitation, in vitro kinase assay with defined phosphorylation sites, domain-mapping experiments, ROCK2 siRNA knockdown in THP1 cells, KD025 inhibitor, ROS measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay mapping four specific phosphorylation sites with domain-level binding mapping and cell-based validation using siRNA and selective inhibitor","pmids":["36626553"],"is_preprint":false},{"year":2023,"finding":"A ROCK2/JAM-A complex emerges in lymphatic endothelial cells under cytokine challenge and is responsible for cytokine-induced lymphatic junction zippering and impaired lymphatic drainage; lymphatic-specific ROCK2 knockout reverses lymphedema in vivo.","method":"Microfluidic lymphatic vessel model, ROCK2 isoform-specific inhibition, lymphatic-specific ROCK2 genetic knockout mouse, lymphedema assessment, ROCK2/JAM-A complex identification","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — novel protein complex identified with functional consequence validated in both engineered in vitro system and cell-type-specific genetic KO model in vivo","pmids":["37782785"],"is_preprint":false},{"year":2019,"finding":"ROCK2 regulates TGF-β-induced CTGF expression and profibrotic gene expression in mesangial cells via NF-κB nuclear translocation and actin cytoskeleton dynamics through phosphorylation of JNK and ERK; siRNA knockdown showed ROCK2 but not ROCK1 controls this fibrotic signaling machinery.","method":"ROCK1 and ROCK2 siRNA isoform-specific knockdown, western blot for JNK/ERK phosphorylation and NF-κB nuclear translocation, CTGF expression assay, db/db mouse model","journal":"American journal of physiology. Renal physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform discrimination with pathway biochemistry confirmed in vivo, single lab","pmids":["31364374"],"is_preprint":false},{"year":2010,"finding":"ROCK2 dynamically associates with the LOX-1 scavenger receptor complex in the presence of OxLDL; OxLDL stimulates ROCK2 catalytic activity, and ROCK2 inhibition attenuates NF-κB activation and IL-8 production downstream of LOX-1.","method":"Affinity purification/mass spectrometry of LOX-1 complex, reciprocal co-immunoprecipitation, ROCK2 kinase activity assay, NF-κB luciferase reporter, IL-8 ELISA","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with functional kinase activity and downstream signaling readouts, single lab","pmids":["20181930"],"is_preprint":false},{"year":2017,"finding":"Nogo-66 signals through Lingo1/NgR1 to restrict LTP at the Schaffer collateral-CA1 pathway via the ROCK2-cofilin pathway, controlling actin cytoskeleton dynamics; p75NTR is not involved in mediating the Nogo-66 effect on LTP.","method":"Electrophysiology in acute hippocampal slices, loss-of-function for Lingo1, p75NTR, and NgR1, cofilin phosphorylation biochemistry","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined epistatic pathway with electrophysiology and biochemistry, multiple loss-of-function conditions, single lab","pmids":["27166169"],"is_preprint":false},{"year":2021,"finding":"GASC1 histone demethylase maintains ROCK2 protein stability by transcriptionally repressing FBXO42, a ROCK2 E3 ubiquitin ligase that mediates K63-linked poly-ubiquitination of ROCK2; GASC1 demethylase activity is required for this FBXO42 repression.","method":"GASC1 knockdown, FBXO42 identification as ROCK2 E3 ligase, ubiquitination type analysis (K63-linked), GASC1 inhibitor SD70, xenograft mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — identification of specific E3 ligase with ubiquitination type characterization and in vivo validation, single lab","pmids":["33692332"],"is_preprint":false},{"year":2024,"finding":"TRIM26 E3 ligase ubiquitylates ROCK2 and promotes its degradation; upregulation of TRIM26 in doxorubicin-resistant leukemia cells reduces ROCK2 levels and increases drug sensitivity.","method":"TRIM26 identification as ROCK2 E3 ligase, ubiquitination assay, drug sensitivity assays in AML cell lines","journal":"International immunopharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — E3 ligase identified but limited mechanistic detail in abstract, single lab","pmids":["39126734"],"is_preprint":false},{"year":2009,"finding":"In keratinocytes, ROCK2 depletion results in increased adhesion to fibronectin and inhibition of terminal differentiation, demonstrating ROCK2 has a distinct role from ROCK1 (which decreases adhesion and promotes differentiation) in regulating keratinocyte adhesion and differentiation.","method":"RNAi knockdown of ROCK1 or ROCK2 in human keratinocytes, fibronectin adhesion assays, differentiation marker analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — isoform-specific RNAi with defined functional readouts, single lab","pmids":["19997641"],"is_preprint":false},{"year":2019,"finding":"CD99 wild-type expression in osteosarcoma cells inhibits ROCK2 signaling by maintaining c-Src in an inactive conformation; ROCK2 suppression by CD99 leads to decreased ezrin at the cell membrane and translocation of N-cadherin and β-catenin to the plasma membrane, reducing cell migration.","method":"CD99 forced expression, ROCK2 expression and activity analysis, c-Src activity, actin cytoskeleton and adherens junction protein localization, migration assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — defined signaling hierarchy (CD99→c-Src→ROCK2→ezrin) with multiple protein localization readouts, single lab","pmids":["23644663"],"is_preprint":false},{"year":2018,"finding":"YAP transcription co-activator upregulates ROCK2 expression by binding the ROCK2 promoter region in an actomyosin activity-dependent manner; ROCK2 in turn promotes transcriptional activation by YAP, establishing a positive feedback loop modulated by ECM stiffness.","method":"YAP knockdown, ROCK2 promoter activity assay with constitutively active YAP, ChIP for YAP binding to ROCK2 promoter, ECM rigidity manipulation","journal":"Cell adhesion & migration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-based direct promoter binding plus functional promoter reporter, single lab","pmids":["28686514"],"is_preprint":false},{"year":2024,"finding":"ROCK2 mediates sevoflurane-induced cognitive impairment by phosphorylating radixin, which anchors α5-GABAAR to extrasynaptic sites; inhibition of the RhoA/ROCK2 pathway with fasudil or AAV-mediated ROCK2 knockdown decreases extrasynaptic α5-GABAAR distribution and improves cognitive function in aged mice.","method":"Aged mouse sevoflurane exposure, ROCK2 and p-radixin western blot, α5-GABAAR membrane fractionation, colocalization immunofluorescence, Morris water maze, AAV ROCK2 knockdown, fasudil treatment","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined radixin phosphorylation mechanism with two independent inhibitory approaches and behavioral readout, single lab","pmids":["38825816"],"is_preprint":false}],"current_model":"ROCK2 is a RhoA/B/C-activated serine/threonine kinase that phosphorylates multiple substrates—including MLC2, cofilin, p300 acetyltransferase (nuclear), p47phox (in monocytes), PKCβ2 (Thr641), IRF8, and radixin—to regulate actin cytoskeleton dynamics, gene expression, immune cell function, and metabolic reprogramming; it also controls protein stability of MMP2, β-catenin, Cdc25A, PFKFB3, and O-GlcNAc transferase by preventing their ubiquitination/degradation, negatively regulates TGF-β signaling by promoting lysosomal degradation of TGF-β type I receptors, and forms context-specific complexes (with LOX-1, p22phox, JAM-A, KAP, and p300) that position it as a nodal regulator of cardiovascular, immune, metabolic, and neurological processes."},"narrative":{"mechanistic_narrative":"ROCK2 is a Rho-activated serine/threonine kinase that couples actomyosin cytoskeletal dynamics to gene expression, immune signaling, and metabolic programs across cardiovascular, neural, immune, and oncogenic contexts [PMID:18718479, PMID:23392171, PMID:32229726]. Its canonical cytoskeletal output is phosphorylation of MLC2 and cofilin, which is required to stabilize the actin cytoskeleton and to support cell adhesion, dendritic spine morphology, synaptic transmission, and hippocampal LTP [PMID:18718479, PMID:23392171, PMID:27166169]. Beyond the cytoplasm, ROCK2 enters the nucleus to phosphorylate the acetyltransferase p300 and increase its activity, and it directly phosphorylates the transcription factor IRF8 to promote SREBP2-driven cholesterol-biosynthetic gene programs in germinal center B cells while restraining AKT to enhance FOXO1 [PMID:16574662, PMID:32229726]. ROCK2 acts as a substrate-specific kinase in additional settings, phosphorylating PKCβ2 at Thr641 to impair GLUT4 translocation in the diabetic heart, phosphorylating p47phox on Ser304/Ser315/Ser320/Ser328 to control monocyte NADPH oxidase activation through a p22phox-anchored complex, and phosphorylating radixin to anchor α5-GABAAR at extrasynaptic sites [PMID:24466133, PMID:36626553, PMID:38825816]. A recurring theme is ROCK2-dependent control of protein stability, where ROCK2 prevents ubiquitin-mediated degradation of targets including Cdc25A, while ROCK2 itself is degraded by the APC/C-Cdh1 ligase in neurons and is destabilized by FBXO42, with its accumulation driving dendritic disorganization and neurodegeneration [PMID:22705122, PMID:28396402, PMID:33692332]. ROCK2 negatively regulates TGF-β signaling by binding TGF-β type I receptors and accelerating their lysosomal degradation, and many of its disease roles—cardiac hypertrophy and fibrosis, diabetic complications, lymphedema, and tumor invasion—are isoform-specific to ROCK2 rather than ROCK1 [PMID:19509062, PMID:30884801, PMID:28679962, PMID:37782785]. Crystallographic work has defined active-site residues (Asp176, Asp218) distinguishing ROCK2 from PKA for inhibitor selectivity [PMID:30384606].","teleology":[{"year":2006,"claim":"Established that ROCK2 acts in the nucleus, not only the cytoplasm, by binding and phosphorylating p300 to enhance its acetyltransferase activity—extending ROCK2 function from cytoskeletal control to transcriptional regulation.","evidence":"Co-IP, gel filtration, in vitro kinase assay with acetyltransferase readout, and nuclear-restricted constitutively active ROCK2 in cells","pmids":["16574662"],"confidence":"High","gaps":["Phospho-site on p300 not mapped","In vivo significance of nuclear ROCK2-p300 axis not established"]},{"year":2008,"claim":"Demonstrated that ROCK2 is genetically required for neuronal actin organization and synaptic plasticity, linking the ROCK2/cofilin axis to dendritic spine morphology and LTP.","evidence":"ROCK2 knockout mice with electrophysiology, spine morphometry, and cofilin phosphorylation analysis","pmids":["18718479"],"confidence":"High","gaps":["Does not distinguish direct cofilin phosphorylation from indirect effects","Cell-autonomy within neuronal subtypes not resolved"]},{"year":2009,"claim":"Identified a non-cytoskeletal role for ROCK2 as a negative regulator of TGF-β signaling by routing TGF-β type I receptors to lysosomal degradation, requiring kinase activity.","evidence":"Co-IP, receptor degradation assays, kinase-dead mutants, and zebrafish epistasis","pmids":["19509062"],"confidence":"High","gaps":["Direct kinase substrate driving receptor degradation not identified","Relationship to later pro-fibrotic TGF-β/Smad2 roles unresolved"]},{"year":2013,"claim":"Confirmed the isoform-specific requirement of ROCK2 for actin cytoskeleton stability via MLC2 and cofilin phosphorylation and for proper cell adhesion using a clean knockout system.","evidence":"ROCK2 knockout MEFs with actin imaging, MLC2/cofilin western blots, adhesion assays","pmids":["23392171"],"confidence":"High","gaps":["Does not exclude compensatory ROCK1 contributions","Adhesion molecule targets not defined"]},{"year":2014,"claim":"Showed ROCK2 is a substrate-specific kinase for PKCβ2 (Thr641), connecting ROCK2 over-activation to impaired GLUT4 translocation and metabolic dysfunction in the diabetic heart.","evidence":"In vitro kinase assay, reciprocal co-IP, siRNA knockdown, GLUT4 confocal imaging in diabetic rat hearts","pmids":["24466133"],"confidence":"High","gaps":["Stoichiometry and dynamics of PKCβ2 phosphorylation in vivo not quantified"]},{"year":2014,"claim":"Established that ROCK2 activity and isoform-specific splicing are integrated into myogenic differentiation, with KAP activating ROCK2 and Rbfox2-controlled splicing required for myoblast fusion.","evidence":"Isoform-specific siRNA, iCLIP, RNA-seq, KAP co-IP and activity assays, myoblast fusion rescue","pmids":["17606625","24704824","25087874"],"confidence":"High","gaps":["Functional distinction of the ROCK2m muscle isoform at the substrate level unclear","How KAP activates ROCK2 mechanistically not defined"]},{"year":2017,"claim":"Identified ROCK2 as an APC/C-Cdh1 ubiquitin ligase substrate in neurons whose accumulation drives dendritic disorganization, memory loss, and neurodegeneration reversible by ROCK inhibition.","evidence":"Cdh1 conditional knockout mice, ROCK2 protein measurement, in vivo fasudil rescue, behavioral testing","pmids":["28396402"],"confidence":"High","gaps":["Degron/recognition motif on ROCK2 not mapped","Substrates downstream of accumulated ROCK2 in neurons not enumerated"]},{"year":2017,"claim":"Demonstrated a cell-type-specific paracrine fibrotic role: fibroblast ROCK2 drives CTGF expression and FGF2 secretion that elicit cardiomyocyte hypertrophy.","evidence":"Fibroblast-specific ROCK2 conditional knockout mice, Ang II, echocardiography, conditioned media hypertrophy assay","pmids":["28679962"],"confidence":"High","gaps":["Direct ROCK2 substrate controlling CTGF/FGF2 not identified"]},{"year":2018,"claim":"Defined the structural basis for ROCK2 inhibitor selectivity, identifying Asp176 and Asp218 as active-site residues distinguishing ROCK2 from PKA.","evidence":"X-ray cocrystal structures of inhibitor-bound ROCK1 and ROCK2","pmids":["30384606"],"confidence":"High","gaps":["Does not address ROCK2 vs ROCK1 selectivity at these residues","No regulatory/full-length conformational information"]},{"year":2019,"claim":"Resolved isoform-specific ROCK2 control of cardiac homeostasis, showing single ROCK2 loss triggers compensatory ROCK1 overactivation and autophagy suppression via mTOR, while RyR/CaMKII phosphorylation links ROCK2 to arrhythmic calcium handling.","evidence":"Cardiomyocyte-specific inducible single/double ROCK knockouts and ROCK2+/- diabetic mice with phosphorylation and Ca2+ imaging readouts","pmids":["30848941","30728103"],"confidence":"High","gaps":["Whether ROCK2 phosphorylates CaMKII/RyR directly not established","Mechanism of ROCK1 compensation unresolved"]},{"year":2019,"claim":"Showed ROCK2 inhibition reprograms collective tumor invasion and adipocyte fate, revealing FARP2/myosin-II-dependent leader-cell formation and actin-dependent suppression of thermogenic gene programs.","evidence":"siRNA screens with 3D organotypic cultures, myosin-II inhibition; ROCK2+/- and kinase-dead knock-in mice with KD025","pmids":["31304629","31914704"],"confidence":"High","gaps":["Direct ROCK2 substrate governing the beige/thermogenic switch unidentified","Generalizability of leader/follower polarization beyond colorectal models untested"]},{"year":2020,"claim":"Identified direct ROCK2 phosphorylation of IRF8 to drive SREBP2-dependent cholesterol-biosynthetic gene programs and germinal center polarization, with parallel AKT restraint enhancing FOXO1.","evidence":"B cell-specific ROCK2 deletion, RNA-seq, ATAC-seq, IRF8 phosphorylation assays, SREBP2 ChIP","pmids":["32229726"],"confidence":"High","gaps":["IRF8 phospho-residues not specified here","Connection between AKT restraint and IRF8 axis not integrated"]},{"year":2022,"claim":"Established a transcriptional metabolic role in podocytes where ROCK2 suppresses PPARα and fatty acid oxidation genes, contributing to diabetic podocyte apoptosis.","evidence":"Podocyte-specific ROCK2 knockout mice with RNA-seq across multiple diabetic models","pmids":["35396346"],"confidence":"High","gaps":["Whether PPARα suppression is direct or via an intermediate transcription factor unclear","Kinase substrate linking ROCK2 to PPARα regulation unknown"]},{"year":2023,"claim":"Mapped a ROCK2-p22phox complex and four p47phox phosphorylation sites controlling monocyte NADPH oxidase, and a cytokine-induced ROCK2/JAM-A complex driving lymphatic junction zippering, defining context-specific ROCK2 protein complexes with disease consequences.","evidence":"Reciprocal co-IP with domain mapping and in vitro kinase assays; microfluidic lymphatic models with lymphatic-specific ROCK2 knockout mice","pmids":["36626553","37782785"],"confidence":"High","gaps":["JAM-A as a direct ROCK2 substrate not established","Cell-type restriction of p22phox-ROCK2 binding (monocytes vs neutrophils) mechanistically unexplained"]},{"year":2024,"claim":"Demonstrated that ROCK2 phosphorylates radixin to anchor α5-GABAAR extrasynaptically, linking ROCK2 activity to anesthesia-associated cognitive impairment in aged brain.","evidence":"Aged-mouse sevoflurane model with p-radixin western blot, receptor fractionation, AAV ROCK2 knockdown, and fasudil rescue with behavioral testing","pmids":["38825816"],"confidence":"Medium","gaps":["Direct radixin phospho-site not mapped here","Whether radixin is a direct ROCK2 substrate in this context not biochemically isolated"]},{"year":null,"claim":"It remains unresolved how ROCK2 mechanistically achieves substrate-stability control (preventing ubiquitination of Cdc25A, β-catenin, MMP2, PFKFB3, OGT) versus direct phosphorylation, and whether these stabilizations reflect a common kinase-dependent mechanism.","evidence":"","pmids":[],"confidence":"Low","gaps":["No direct kinase-substrate reconstitution for the stability targets","Distinction between ROCK2 catalytic vs scaffolding contributions unclear","Whether stability effects are direct or pathway-mediated unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,10,25,32,42]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[3,10,32]},{"term_id":"GO:0140110","term_label":"transcription regulator 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nuclear-restricted constitutively active ROCK2 induces p300 phosphorylation, and p300 phosphorylation by ROCK2 increases its acetyltransferase activity in vitro.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration, immunofluorescence colocalization, in vitro kinase assay, nuclear-restricted constitutively active ROCK2 expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with functional readout (acetyltransferase activity) plus reciprocal co-IP and cell-based validation in one study\",\n      \"pmids\": [\"16574662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ROCK2 acts as a negative regulator of TGF-β signaling by binding to TGF-β type I receptors and accelerating their lysosomal degradation after internalization from the cell surface; this inhibitory effect requires ROCK2 kinase activity.\",\n      \"method\": \"Co-immunoprecipitation, receptor degradation assays, kinase-dead mutant analysis, zebrafish mRNA injection and dominant-negative overexpression\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — binding/degradation mechanism established in mammalian cells with kinase-dead mutant validation, plus in vivo zebrafish epistasis\",\n      \"pmids\": [\"19509062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ROCK2 knockout mice show deficits in dendritic spine morphology, synapse density, basal synaptic transmission, and hippocampal LTP, associated with deficits in actin cytoskeleton organization and cofilin phosphorylation, indicating ROCK2/cofilin signaling is required for neuronal actin regulation and synaptic function.\",\n      \"method\": \"Genetic knockout mouse model, electrophysiology (LTP), spine morphometry, cofilin phosphorylation western blot\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with multiple orthogonal phenotypic readouts (electrophysiology, morphometry, biochemistry)\",\n      \"pmids\": [\"18718479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In ROCK2-/- MEFs, ROCK2 is required for stabilizing the actin cytoskeleton through regulating cofilin phosphorylation; ROCK2 loss results in reduced phosphorylation of both MLC2 and cofilin, increased peripheral membrane folding, and impaired cell adhesion.\",\n      \"method\": \"ROCK2 knockout MEFs, actin cytoskeleton imaging, MLC2 and cofilin phosphorylation western blot, cell adhesion and detachment assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific knockout with multiple orthogonal biochemical and cell biological readouts\",\n      \"pmids\": [\"23392171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"During ouabain-induced apoptosis in HUVECs, ROCK2 is cleaved by caspase-2, generating a ~140 kDa fragment corresponding to a novel caspase-2 cleavage site on the carboxy terminus of ROCK2; this cleavage is prevented by the caspase-2 inhibitor z-VDVAD-fmk.\",\n      \"method\": \"Caspase inhibitor treatment (z-DEVD-fmk, z-VDVAD-fmk), western blot for ROCK2 cleavage fragments\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, pharmacological inhibitor approach identifying cleavage fragment without direct mutagenesis validation\",\n      \"pmids\": [\"20661774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ROCK2 directly binds Cdc25A, regulates cell cycle progression at G1/S by preventing Cdc25A ubiquitination and degradation; knockdown of ROCK2 activates Cdc25A ubiquitination and promotes its degradation in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown, ubiquitination assay, flow cytometry cell cycle analysis\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Weak — reciprocal co-IP and ubiquitination assay but single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"22705122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ROCK2 stabilizes MMP2 by preventing its ubiquitination and degradation in hepatocellular carcinoma, thereby promoting invasion and metastasis.\",\n      \"method\": \"siRNA knockdown, ubiquitination assay, rescue experiments with MMP2 re-expression, invasion/migration assays in vitro and in vivo\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, ubiquitination assay plus functional rescue, but no direct in vitro reconstitution\",\n      \"pmids\": [\"25251472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ROCK2 is a positive regulator of the p42/p44 MAPK–p90RSK–eEF2 signaling pathway in myogenic cells and controls hypertrophic responses to IGF-1 and insulin; an alternatively spliced muscle-specific isoform ROCK2m is preferentially expressed in skeletal muscle and strongly upregulated during differentiation.\",\n      \"method\": \"Specific siRNA knockdown of ROCK2 or ROCK2m in C2C12 cells, western blot for MAPK/RSK/eEF2 pathway components, myogenic differentiation markers\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — isoform-specific knockdown with biochemical pathway readout, two isoforms distinguished, single lab\",\n      \"pmids\": [\"17606625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KAP (cyclin-dependent kinase-associated phosphatase) binds and activates ROCK2; RNA-mediated downregulation of KAP leads to decreased ROCK2 activity, which in turn increases Rac1-mediated glioblastoma invasion.\",\n      \"method\": \"Co-immunoprecipitation, ROCK2 activity assays, siRNA knockdown, invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Weak — binding established by co-IP with functional activity readout, single lab\",\n      \"pmids\": [\"24704824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The RNA-binding protein Rbfox2 regulates ROCK2 alternative splicing during myogenesis; the specific ROCK2 splicing isoform generated is required for myoblast fusion, and restored ROCK2 activity rescues myoblast fusion in Rbfox2-depleted cultures.\",\n      \"method\": \"RNA-seq, iCLIP, Rbfox2 knockdown, rescue with ROCK2 re-expression, myoblast fusion assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iCLIP direct binding data combined with functional rescue in defined cellular assay, multiple orthogonal methods\",\n      \"pmids\": [\"25087874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ROCK2 directly phosphorylates PKCβ2 at Thr641 in vitro, forming a physical complex; over-activation of ROCK2 in the diabetic heart leads to PKCβ2 activation and interferes with PDK-1/AKT-mediated GLUT4 translocation.\",\n      \"method\": \"In vitro kinase assay, reciprocal co-immunoprecipitation, siRNA knockdown, GLUT4 translocation confocal microscopy, western blot from diabetic rat hearts\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro phosphorylation at defined residue combined with reciprocal co-IP and cell-based validation\",\n      \"pmids\": [\"24466133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ROCK2 stabilizes β-catenin by preventing its ubiquitination and degradation in colorectal cancer cells, thereby promoting invasion and metastasis via the β-catenin/TCF4 pathway.\",\n      \"method\": \"siRNA knockdown, ubiquitination assay, β-catenin stability assays, in vitro and in vivo invasion assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, ubiquitination assay without direct reconstitution of the stabilization mechanism\",\n      \"pmids\": [\"26505794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ROCK2 promotes HCC cell proliferation through a Rock2–p-GSK3β–β-catenin–CEBPD regulatory axis, in which ROCK2 phosphorylates GSK3β to activate β-catenin signaling and suppress the tumor suppressor CEBPD.\",\n      \"method\": \"ROCK2 knockdown, western blot for p-GSK3β/β-catenin/CEBPD, in vitro and in vivo proliferation assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, inferred pathway placement from knockdown/western blot without direct kinase assay on GSK3β\",\n      \"pmids\": [\"25771860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ROCK2 (but not ROCK1) specifically drives LPA-induced expression of MCP-1 and E-selectin in human aortic endothelial cells via NF-κB RelA/p65 nuclear translocation, controlling monocyte chemotaxis and monocyte–endothelial adhesion.\",\n      \"method\": \"siRNA isoform-selective knockdown, NF-κB nuclear translocation assay, monocyte migration and adhesion assays, IκBα phosphorylation western blot\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific knockdown with multiple functional readouts and defined pathway placement, single lab\",\n      \"pmids\": [\"30884801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ROCK2 (but not ROCK1) activates JAK2/STAT3 signaling through increased IL-6 expression and upregulation of IKKβ/NF-κB transcription, forming a positive feedback loop that confers chemoresistance in hepatocellular carcinoma; IKKβ is identified as a direct downstream target of ROCK2.\",\n      \"method\": \"siRNA isoform-specific knockdown, ROCK2 overexpression, western blot for JAK2/STAT3/IKKβ/NF-κB, in vitro and in vivo chemoresistance assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — isoform discrimination with pathway biochemistry, single lab, no direct kinase assay on IKKβ\",\n      \"pmids\": [\"27213590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ROCK2 (but not ROCK1) mediates acid-induced upregulation of NOX5-S expression and H2O2 production in esophageal adenocarcinoma cells; constitutively active ROCK2 enhances NOX5-S expression, and this activation is dependent on intracellular calcium increase.\",\n      \"method\": \"ROCK isoform-specific siRNA knockdown, constitutively active ROCK2/ROCK1 overexpression, ROCK activity assay, calcium chelation experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform discrimination using both knockdown and constitutively active constructs with mechanistic calcium link, single lab\",\n      \"pmids\": [\"26901778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rock2 is an APC/C-Cdh1 ubiquitin ligase substrate in neurons; Cdh1 conditional knockout leads to Rock2 protein accumulation in the cortex and hippocampus, and pharmacological Rock inhibition with fasudil rescues dendritic network disorganization, memory loss, and neurodegeneration in these mice.\",\n      \"method\": \"Cdh1 conditional knockout mouse, Rock2 protein level measurement, in vivo fasudil treatment, dendritic morphometry, memory behavioral tests\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic identification of ROCK2 as APC/CCdh1 substrate in vivo with functional rescue by ROCK inhibition, multiple orthogonal readouts\",\n      \"pmids\": [\"28396402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Fibroblast-specific ROCK2 deletion reduces angiotensin II-stimulated cardiac hypertrophy and fibrosis; mechanistically, ROCK2 knockdown in cardiac fibroblasts decreases expression of CTGF and secretion of FGF2, and conditioned media from ROCK2-knockdown fibroblasts elicits less cardiomyocyte hypertrophy.\",\n      \"method\": \"Fibroblast-specific ROCK2 conditional knockout mice, Ang II treatment, echocardiography, CTGF/FGF2 expression, conditioned media cardiomyocyte hypertrophy assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific genetic deletion with conditioned media experiments providing paracrine mechanism, multiple orthogonal readouts\",\n      \"pmids\": [\"28679962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cocrystal structures of dual ROCK1 and ROCK2 inhibitors identified Asp176 and Asp218 in ROCK2 (corresponding to Glu residues in PKA) as key residues that can be targeted to drive both potency and kinome selectivity.\",\n      \"method\": \"X-ray cocrystal structures of inhibitor-bound ROCK1 and ROCK2\",\n      \"journal\": \"Journal of medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures directly identifying active-site residues distinguishing ROCK2 from PKA\",\n      \"pmids\": [\"30384606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 inhibition triggers collective invasion of colorectal adenocarcinoma cells by inducing leader/follower polarization of cell cohorts; FARP2 (a Rac1 GEF) is necessary downstream of ROCK2 inhibition for invasion, and concomitant inhibition of Myosin-II is required alongside ROCK2 inhibition to trigger leader cell formation.\",\n      \"method\": \"siRNA screens targeting Rho-GTPase effectors and GEFs, 3D organotypic Caco-2 cyst cultures, pharmacological myosin-II inhibition, live ex vivo invasion assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-scale siRNA screens with orthogonal pharmacological validation, ex vivo human tissue confirmation, single lab\",\n      \"pmids\": [\"31304629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 stabilizes PFKFB3 by modifying its ubiquitination and degradation, thereby promoting glycolysis and osteosarcoma proliferation and metastasis.\",\n      \"method\": \"siRNA knockdown, ubiquitination assay, PFKFB3 rescue experiments, in vitro and in vivo proliferation/invasion assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, indirect ubiquitination assay without direct reconstitution of kinase-substrate relationship\",\n      \"pmids\": [\"31678169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 disrupts MKP1 at two levels: it activates ERK1/2-ATF2 signaling to increase MKP1 mRNA expression, while simultaneously promoting ERK1/2-dependent ubiquitin-mediated MKP1 protein degradation, net result being decreased MKP1 protein and promoted HCC metastasis.\",\n      \"method\": \"ROCK2 knockdown, western blot for MKP1 protein and mRNA, ERK1/2 pathway analysis, ubiquitination assay\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, pathway inference from knockdown with no direct kinase assay linking ROCK2 to ERK or ATF2\",\n      \"pmids\": [\"32266097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 promotes cardiomyocyte arrhythmic calcium release in diabetic hearts by promoting CaMKII-mediated phosphorylation of the ryanodine receptor (RyR); ROCK2+/- diabetic mice show decreased CaMKII and RyR phosphorylation and reduced diastolic Ca2+ leak.\",\n      \"method\": \"ROCK2+/- mice, streptozotocin-diabetic model, Ca2+ transient imaging, CaMKII and RyR phosphorylation western blot, pharmacological ROCK inhibition (Y-27632)\",\n      \"journal\": \"International journal of cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic haploinsufficiency combined with pharmacological inhibition and biochemical phosphorylation analysis, single lab\",\n      \"pmids\": [\"30728103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 disruption in cardiomyocytes leads to reduced MLC and FAK phosphorylation; ROCK2 single knockout causes compensatory ROCK1 overactivation with increased p-MLC and p-FAK, inhibited autophagy via increased mTOR activity, and increased cardiac fibrosis, whereas double ROCK1/ROCK2 knockout promotes autophagy via reduced AKT/mTOR/ULK1 signaling.\",\n      \"method\": \"Cardiomyocyte-specific tamoxifen-inducible ROCK knockout mice, western blot for MLC/FAK/AKT/mTOR/ULK1 phosphorylation, LC3B autophagy marker, cardiac histology\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic mouse lines (single and double KO) with defined compensatory mechanism and multiple biochemical readouts, single lab\",\n      \"pmids\": [\"30848941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 inhibition enhances beige adipogenesis in white adipose tissue; ROCK2 activity-mediated actin cytoskeleton dynamics suppress thermogenic gene expression, and selective ROCK2 inhibition (KD025) or ROCK2 haploinsufficiency in vivo reproduces the pro-beige phenotype.\",\n      \"method\": \"ROCK2+/- and ROCK2 kinase-dead knock-in mice, high-fat diet model, adipose tissue histology, thermogenic gene expression, KD025 treatment of differentiated stromal-vascular cells\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two complementary genetic models plus pharmacological validation, single lab\",\n      \"pmids\": [\"31914704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ROCK2 is activated in germinal center (GC) B cells by CD40 and IL-21 signals; ROCK2 regulates GC formation and maintains a transcriptional program for GC polarization and cholesterol biosynthesis by: (1) restraining AKT activation to enhance FOXO1 activity, and (2) directly phosphorylating IRF8 to promote its interaction with SREBP2 at cholesterol biosynthetic gene regulatory regions.\",\n      \"method\": \"B cell-specific ROCK2 deletion, RNA-seq, ATAC-seq, biochemical IRF8 phosphorylation assays, ChIP for SREBP2 recruitment\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct phosphorylation of IRF8 identified, ATAC-seq/ChIP confirmed downstream chromatin effects, multiple orthogonal genomic and biochemical methods\",\n      \"pmids\": [\"32229726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ROCK2 affects osteosarcoma progression and TRAIL resistance by modifying O-GlcNAcylation through stabilization of O-GlcNAc transferase (preventing its degradation).\",\n      \"method\": \"ROCK2 silencing, proteomics analysis, O-GlcNAc transferase expression and ubiquitination analysis, apoptosis assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, mechanism inferred from proteomics without direct reconstitution of kinase-OGT interaction\",\n      \"pmids\": [\"32266091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ROCK2 directly inhibits Parkin-dependent mitophagy; ROCK2 inhibition promotes mitophagy through this pathway, providing a mechanism for neuroprotection in neurodegenerative disease models.\",\n      \"method\": \"Pharmacological ROCK2 inhibition, mitophagy pathway analysis (reviewed with supporting experimental citations)\",\n      \"journal\": \"Neuroscience and biobehavioral reviews\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — review paper synthesizing evidence; no direct primary experiment in this paper\",\n      \"pmids\": [\"36122738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ROCK2 inhibition in macrophages directly disrupts STAT3/cofilin signaling, inhibiting pro-inflammatory cytokine production and macrophage migration; in vivo ROCK2 inhibition reduces STAT3 phosphorylation and cofilin levels in fibrotic liver.\",\n      \"method\": \"Selective ROCK2 inhibitor KD025 treatment in vitro and in vivo, western blot for STAT3/cofilin phosphorylation, macrophage migration and cytokine assays, thioacetamide liver fibrosis model\",\n      \"journal\": \"JHEP reports : innovation in hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined biochemical pathway with in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"34917911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Fibroblast deletion of ROCK2 specifically reduces TGF-β1/Smad2 signaling and cardiac fibroblast activation; ROCK2 mediates cardiac fibrosis through the TGF-β1/Smad2 pathway.\",\n      \"method\": \"ROCK2 siRNA knockdown, belumosudil treatment, western blot for Smad2 phosphorylation, cardiac fibroblast activation assays, TAC mouse model\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — siRNA and pharmacological inhibition with defined pathway readout, in vivo validation, single lab\",\n      \"pmids\": [\"35657612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ROCK2 serves as a suppressor of PPARα transcription in podocytes, rewiring cellular metabolism by negatively controlling transcription of genes involved in fatty acid oxidation, which induces podocyte apoptosis in diabetic conditions.\",\n      \"method\": \"Podocyte-specific ROCK2 knockout mice, RNA-sequencing of ROCK2-null podocytes, multiple diabetic mouse models (STZ, db/db, HFD), albuminuria and fibrosis readouts\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific genetic deletion with RNA-seq identifying direct transcriptional suppression target, validated across multiple disease models\",\n      \"pmids\": [\"35396346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ROCK2 enhances homologous recombination (HR) repair in TMZ-resistant glioma cells by upregulating ATM expression through promoting binding of ZEB1 (converted to transcriptional activator by YAP1) to the ATM promoter.\",\n      \"method\": \"ROCK2 silencing, HR assay, ATM expression analysis, ZEB1/YAP1 interaction studies, ChIP for ZEB1 binding to ATM promoter\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — ChIP and molecular mechanism defined but single lab, abstract does not detail all controls\",\n      \"pmids\": [\"35145081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ROCK2 associates with p22phox in human monocytes (but not neutrophils) via interaction between the cytosolic region of p22phox (aa 132–195) and the coiled-coil region of ROCK2 (aa 400–967); ROCK2 phosphorylates p47phox on Ser304, Ser315, Ser320, and Ser328 in vitro but does not phosphorylate p22phox, p40phox, p67phox, or gp91phox, thereby controlling NADPH oxidase activation in monocytes.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, in vitro kinase assay with defined phosphorylation sites, domain-mapping experiments, ROCK2 siRNA knockdown in THP1 cells, KD025 inhibitor, ROS measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay mapping four specific phosphorylation sites with domain-level binding mapping and cell-based validation using siRNA and selective inhibitor\",\n      \"pmids\": [\"36626553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A ROCK2/JAM-A complex emerges in lymphatic endothelial cells under cytokine challenge and is responsible for cytokine-induced lymphatic junction zippering and impaired lymphatic drainage; lymphatic-specific ROCK2 knockout reverses lymphedema in vivo.\",\n      \"method\": \"Microfluidic lymphatic vessel model, ROCK2 isoform-specific inhibition, lymphatic-specific ROCK2 genetic knockout mouse, lymphedema assessment, ROCK2/JAM-A complex identification\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel protein complex identified with functional consequence validated in both engineered in vitro system and cell-type-specific genetic KO model in vivo\",\n      \"pmids\": [\"37782785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ROCK2 regulates TGF-β-induced CTGF expression and profibrotic gene expression in mesangial cells via NF-κB nuclear translocation and actin cytoskeleton dynamics through phosphorylation of JNK and ERK; siRNA knockdown showed ROCK2 but not ROCK1 controls this fibrotic signaling machinery.\",\n      \"method\": \"ROCK1 and ROCK2 siRNA isoform-specific knockdown, western blot for JNK/ERK phosphorylation and NF-κB nuclear translocation, CTGF expression assay, db/db mouse model\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform discrimination with pathway biochemistry confirmed in vivo, single lab\",\n      \"pmids\": [\"31364374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ROCK2 dynamically associates with the LOX-1 scavenger receptor complex in the presence of OxLDL; OxLDL stimulates ROCK2 catalytic activity, and ROCK2 inhibition attenuates NF-κB activation and IL-8 production downstream of LOX-1.\",\n      \"method\": \"Affinity purification/mass spectrometry of LOX-1 complex, reciprocal co-immunoprecipitation, ROCK2 kinase activity assay, NF-κB luciferase reporter, IL-8 ELISA\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with functional kinase activity and downstream signaling readouts, single lab\",\n      \"pmids\": [\"20181930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nogo-66 signals through Lingo1/NgR1 to restrict LTP at the Schaffer collateral-CA1 pathway via the ROCK2-cofilin pathway, controlling actin cytoskeleton dynamics; p75NTR is not involved in mediating the Nogo-66 effect on LTP.\",\n      \"method\": \"Electrophysiology in acute hippocampal slices, loss-of-function for Lingo1, p75NTR, and NgR1, cofilin phosphorylation biochemistry\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined epistatic pathway with electrophysiology and biochemistry, multiple loss-of-function conditions, single lab\",\n      \"pmids\": [\"27166169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GASC1 histone demethylase maintains ROCK2 protein stability by transcriptionally repressing FBXO42, a ROCK2 E3 ubiquitin ligase that mediates K63-linked poly-ubiquitination of ROCK2; GASC1 demethylase activity is required for this FBXO42 repression.\",\n      \"method\": \"GASC1 knockdown, FBXO42 identification as ROCK2 E3 ligase, ubiquitination type analysis (K63-linked), GASC1 inhibitor SD70, xenograft mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — identification of specific E3 ligase with ubiquitination type characterization and in vivo validation, single lab\",\n      \"pmids\": [\"33692332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM26 E3 ligase ubiquitylates ROCK2 and promotes its degradation; upregulation of TRIM26 in doxorubicin-resistant leukemia cells reduces ROCK2 levels and increases drug sensitivity.\",\n      \"method\": \"TRIM26 identification as ROCK2 E3 ligase, ubiquitination assay, drug sensitivity assays in AML cell lines\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — E3 ligase identified but limited mechanistic detail in abstract, single lab\",\n      \"pmids\": [\"39126734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In keratinocytes, ROCK2 depletion results in increased adhesion to fibronectin and inhibition of terminal differentiation, demonstrating ROCK2 has a distinct role from ROCK1 (which decreases adhesion and promotes differentiation) in regulating keratinocyte adhesion and differentiation.\",\n      \"method\": \"RNAi knockdown of ROCK1 or ROCK2 in human keratinocytes, fibronectin adhesion assays, differentiation marker analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — isoform-specific RNAi with defined functional readouts, single lab\",\n      \"pmids\": [\"19997641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD99 wild-type expression in osteosarcoma cells inhibits ROCK2 signaling by maintaining c-Src in an inactive conformation; ROCK2 suppression by CD99 leads to decreased ezrin at the cell membrane and translocation of N-cadherin and β-catenin to the plasma membrane, reducing cell migration.\",\n      \"method\": \"CD99 forced expression, ROCK2 expression and activity analysis, c-Src activity, actin cytoskeleton and adherens junction protein localization, migration assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — defined signaling hierarchy (CD99→c-Src→ROCK2→ezrin) with multiple protein localization readouts, single lab\",\n      \"pmids\": [\"23644663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"YAP transcription co-activator upregulates ROCK2 expression by binding the ROCK2 promoter region in an actomyosin activity-dependent manner; ROCK2 in turn promotes transcriptional activation by YAP, establishing a positive feedback loop modulated by ECM stiffness.\",\n      \"method\": \"YAP knockdown, ROCK2 promoter activity assay with constitutively active YAP, ChIP for YAP binding to ROCK2 promoter, ECM rigidity manipulation\",\n      \"journal\": \"Cell adhesion & migration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-based direct promoter binding plus functional promoter reporter, single lab\",\n      \"pmids\": [\"28686514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ROCK2 mediates sevoflurane-induced cognitive impairment by phosphorylating radixin, which anchors α5-GABAAR to extrasynaptic sites; inhibition of the RhoA/ROCK2 pathway with fasudil or AAV-mediated ROCK2 knockdown decreases extrasynaptic α5-GABAAR distribution and improves cognitive function in aged mice.\",\n      \"method\": \"Aged mouse sevoflurane exposure, ROCK2 and p-radixin western blot, α5-GABAAR membrane fractionation, colocalization immunofluorescence, Morris water maze, AAV ROCK2 knockdown, fasudil treatment\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined radixin phosphorylation mechanism with two independent inhibitory approaches and behavioral readout, single lab\",\n      \"pmids\": [\"38825816\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ROCK2 is a RhoA/B/C-activated serine/threonine kinase that phosphorylates multiple substrates—including MLC2, cofilin, p300 acetyltransferase (nuclear), p47phox (in monocytes), PKCβ2 (Thr641), IRF8, and radixin—to regulate actin cytoskeleton dynamics, gene expression, immune cell function, and metabolic reprogramming; it also controls protein stability of MMP2, β-catenin, Cdc25A, PFKFB3, and O-GlcNAc transferase by preventing their ubiquitination/degradation, negatively regulates TGF-β signaling by promoting lysosomal degradation of TGF-β type I receptors, and forms context-specific complexes (with LOX-1, p22phox, JAM-A, KAP, and p300) that position it as a nodal regulator of cardiovascular, immune, metabolic, and neurological processes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ROCK2 is a Rho-activated serine/threonine kinase that couples actomyosin cytoskeletal dynamics to gene expression, immune signaling, and metabolic programs across cardiovascular, neural, immune, and oncogenic contexts [#2, #3, #25]. Its canonical cytoskeletal output is phosphorylation of MLC2 and cofilin, which is required to stabilize the actin cytoskeleton and to support cell adhesion, dendritic spine morphology, synaptic transmission, and hippocampal LTP [#2, #3, #36]. Beyond the cytoplasm, ROCK2 enters the nucleus to phosphorylate the acetyltransferase p300 and increase its activity, and it directly phosphorylates the transcription factor IRF8 to promote SREBP2-driven cholesterol-biosynthetic gene programs in germinal center B cells while restraining AKT to enhance FOXO1 [#0, #25]. ROCK2 acts as a substrate-specific kinase in additional settings, phosphorylating PKCβ2 at Thr641 to impair GLUT4 translocation in the diabetic heart, phosphorylating p47phox on Ser304/Ser315/Ser320/Ser328 to control monocyte NADPH oxidase activation through a p22phox-anchored complex, and phosphorylating radixin to anchor α5-GABAAR at extrasynaptic sites [#10, #32, #42]. A recurring theme is ROCK2-dependent control of protein stability, where ROCK2 prevents ubiquitin-mediated degradation of targets including Cdc25A, while ROCK2 itself is degraded by the APC/C-Cdh1 ligase in neurons and is destabilized by FBXO42, with its accumulation driving dendritic disorganization and neurodegeneration [#5, #16, #37]. ROCK2 negatively regulates TGF-β signaling by binding TGF-β type I receptors and accelerating their lysosomal degradation, and many of its disease roles—cardiac hypertrophy and fibrosis, diabetic complications, lymphedema, and tumor invasion—are isoform-specific to ROCK2 rather than ROCK1 [#1, #13, #17, #33]. Crystallographic work has defined active-site residues (Asp176, Asp218) distinguishing ROCK2 from PKA for inhibitor selectivity [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that ROCK2 acts in the nucleus, not only the cytoplasm, by binding and phosphorylating p300 to enhance its acetyltransferase activity—extending ROCK2 function from cytoskeletal control to transcriptional regulation.\",\n      \"evidence\": \"Co-IP, gel filtration, in vitro kinase assay with acetyltransferase readout, and nuclear-restricted constitutively active ROCK2 in cells\",\n      \"pmids\": [\"16574662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phospho-site on p300 not mapped\", \"In vivo significance of nuclear ROCK2-p300 axis not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that ROCK2 is genetically required for neuronal actin organization and synaptic plasticity, linking the ROCK2/cofilin axis to dendritic spine morphology and LTP.\",\n      \"evidence\": \"ROCK2 knockout mice with electrophysiology, spine morphometry, and cofilin phosphorylation analysis\",\n      \"pmids\": [\"18718479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not distinguish direct cofilin phosphorylation from indirect effects\", \"Cell-autonomy within neuronal subtypes not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified a non-cytoskeletal role for ROCK2 as a negative regulator of TGF-β signaling by routing TGF-β type I receptors to lysosomal degradation, requiring kinase activity.\",\n      \"evidence\": \"Co-IP, receptor degradation assays, kinase-dead mutants, and zebrafish epistasis\",\n      \"pmids\": [\"19509062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct kinase substrate driving receptor degradation not identified\", \"Relationship to later pro-fibrotic TGF-β/Smad2 roles unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Confirmed the isoform-specific requirement of ROCK2 for actin cytoskeleton stability via MLC2 and cofilin phosphorylation and for proper cell adhesion using a clean knockout system.\",\n      \"evidence\": \"ROCK2 knockout MEFs with actin imaging, MLC2/cofilin western blots, adhesion assays\",\n      \"pmids\": [\"23392171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not exclude compensatory ROCK1 contributions\", \"Adhesion molecule targets not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed ROCK2 is a substrate-specific kinase for PKCβ2 (Thr641), connecting ROCK2 over-activation to impaired GLUT4 translocation and metabolic dysfunction in the diabetic heart.\",\n      \"evidence\": \"In vitro kinase assay, reciprocal co-IP, siRNA knockdown, GLUT4 confocal imaging in diabetic rat hearts\",\n      \"pmids\": [\"24466133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics of PKCβ2 phosphorylation in vivo not quantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that ROCK2 activity and isoform-specific splicing are integrated into myogenic differentiation, with KAP activating ROCK2 and Rbfox2-controlled splicing required for myoblast fusion.\",\n      \"evidence\": \"Isoform-specific siRNA, iCLIP, RNA-seq, KAP co-IP and activity assays, myoblast fusion rescue\",\n      \"pmids\": [\"17606625\", \"24704824\", \"25087874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional distinction of the ROCK2m muscle isoform at the substrate level unclear\", \"How KAP activates ROCK2 mechanistically not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified ROCK2 as an APC/C-Cdh1 ubiquitin ligase substrate in neurons whose accumulation drives dendritic disorganization, memory loss, and neurodegeneration reversible by ROCK inhibition.\",\n      \"evidence\": \"Cdh1 conditional knockout mice, ROCK2 protein measurement, in vivo fasudil rescue, behavioral testing\",\n      \"pmids\": [\"28396402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degron/recognition motif on ROCK2 not mapped\", \"Substrates downstream of accumulated ROCK2 in neurons not enumerated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated a cell-type-specific paracrine fibrotic role: fibroblast ROCK2 drives CTGF expression and FGF2 secretion that elicit cardiomyocyte hypertrophy.\",\n      \"evidence\": \"Fibroblast-specific ROCK2 conditional knockout mice, Ang II, echocardiography, conditioned media hypertrophy assay\",\n      \"pmids\": [\"28679962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ROCK2 substrate controlling CTGF/FGF2 not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the structural basis for ROCK2 inhibitor selectivity, identifying Asp176 and Asp218 as active-site residues distinguishing ROCK2 from PKA.\",\n      \"evidence\": \"X-ray cocrystal structures of inhibitor-bound ROCK1 and ROCK2\",\n      \"pmids\": [\"30384606\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address ROCK2 vs ROCK1 selectivity at these residues\", \"No regulatory/full-length conformational information\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved isoform-specific ROCK2 control of cardiac homeostasis, showing single ROCK2 loss triggers compensatory ROCK1 overactivation and autophagy suppression via mTOR, while RyR/CaMKII phosphorylation links ROCK2 to arrhythmic calcium handling.\",\n      \"evidence\": \"Cardiomyocyte-specific inducible single/double ROCK knockouts and ROCK2+/- diabetic mice with phosphorylation and Ca2+ imaging readouts\",\n      \"pmids\": [\"30848941\", \"30728103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ROCK2 phosphorylates CaMKII/RyR directly not established\", \"Mechanism of ROCK1 compensation unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed ROCK2 inhibition reprograms collective tumor invasion and adipocyte fate, revealing FARP2/myosin-II-dependent leader-cell formation and actin-dependent suppression of thermogenic gene programs.\",\n      \"evidence\": \"siRNA screens with 3D organotypic cultures, myosin-II inhibition; ROCK2+/- and kinase-dead knock-in mice with KD025\",\n      \"pmids\": [\"31304629\", \"31914704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ROCK2 substrate governing the beige/thermogenic switch unidentified\", \"Generalizability of leader/follower polarization beyond colorectal models untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified direct ROCK2 phosphorylation of IRF8 to drive SREBP2-dependent cholesterol-biosynthetic gene programs and germinal center polarization, with parallel AKT restraint enhancing FOXO1.\",\n      \"evidence\": \"B cell-specific ROCK2 deletion, RNA-seq, ATAC-seq, IRF8 phosphorylation assays, SREBP2 ChIP\",\n      \"pmids\": [\"32229726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IRF8 phospho-residues not specified here\", \"Connection between AKT restraint and IRF8 axis not integrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established a transcriptional metabolic role in podocytes where ROCK2 suppresses PPARα and fatty acid oxidation genes, contributing to diabetic podocyte apoptosis.\",\n      \"evidence\": \"Podocyte-specific ROCK2 knockout mice with RNA-seq across multiple diabetic models\",\n      \"pmids\": [\"35396346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PPARα suppression is direct or via an intermediate transcription factor unclear\", \"Kinase substrate linking ROCK2 to PPARα regulation unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapped a ROCK2-p22phox complex and four p47phox phosphorylation sites controlling monocyte NADPH oxidase, and a cytokine-induced ROCK2/JAM-A complex driving lymphatic junction zippering, defining context-specific ROCK2 protein complexes with disease consequences.\",\n      \"evidence\": \"Reciprocal co-IP with domain mapping and in vitro kinase assays; microfluidic lymphatic models with lymphatic-specific ROCK2 knockout mice\",\n      \"pmids\": [\"36626553\", \"37782785\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"JAM-A as a direct ROCK2 substrate not established\", \"Cell-type restriction of p22phox-ROCK2 binding (monocytes vs neutrophils) mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated that ROCK2 phosphorylates radixin to anchor α5-GABAAR extrasynaptically, linking ROCK2 activity to anesthesia-associated cognitive impairment in aged brain.\",\n      \"evidence\": \"Aged-mouse sevoflurane model with p-radixin western blot, receptor fractionation, AAV ROCK2 knockdown, and fasudil rescue with behavioral testing\",\n      \"pmids\": [\"38825816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct radixin phospho-site not mapped here\", \"Whether radixin is a direct ROCK2 substrate in this context not biochemically isolated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ROCK2 mechanistically achieves substrate-stability control (preventing ubiquitination of Cdc25A, β-catenin, MMP2, PFKFB3, OGT) versus direct phosphorylation, and whether these stabilizations reflect a common kinase-dependent mechanism.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct kinase-substrate reconstitution for the stability targets\", \"Distinction between ROCK2 catalytic vs scaffolding contributions unclear\", \"Whether stability effects are direct or pathway-mediated unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 10, 25, 32, 42]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [3, 10, 32]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 25, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 32]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 10, 36]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [25, 28, 32]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 25, 30]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [24, 30]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 16]}\n    ],\n    \"complexes\": [\n      \"ROCK2/p22phox-NADPH oxidase\",\n      \"ROCK2/JAM-A\",\n      \"ROCK2/LOX-1\",\n      \"ROCK2/KAP\"\n    ],\n    \"partners\": [\n      \"p300\",\n      \"PKCB2\",\n      \"p47phox\",\n      \"p22phox\",\n      \"IRF8\",\n      \"Cdc25A\",\n      \"JAM-A\",\n      \"KAP\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}