{"gene":"TRIB3","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2003,"finding":"TRIB3 (identified as SINK) is an NF-κB-inducible protein that specifically interacts with the NF-κB transactivator p65 and inhibits p65 phosphorylation by the catalytic subunit of protein kinase A (PKA), thereby suppressing NF-κB-dependent transcription without blocking NF-κB nuclear translocation or DNA binding. TRIB3 also sensitizes cells to TNF- and TRAIL-induced apoptosis.","method":"Co-immunoprecipitation, in vitro kinase assay, NF-κB reporter assay, overexpression studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reciprocal Co-IP plus in vitro kinase assay in the same study, with functional reporter assay validation","pmids":["12736262"],"is_preprint":false},{"year":2015,"finding":"TRIB3 physically interacts with Parkin, a prosurvival E3 ubiquitin ligase associated with Parkinson's disease. Elevated TRIB3 reduces Parkin expression in cultured neurons; Parkin knockdown abolishes the neuroprotective effect of TRIB3 downregulation, placing TRIB3 upstream of Parkin in a prodeath pathway. TRIB3 induction in PD models is substantially mediated by transcription factors CHOP and ATF4.","method":"Co-immunoprecipitation (physical interaction), siRNA knockdown, overexpression, genetic epistasis (double knockdown), immunostaining in postmortem PD brain tissue","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus epistasis experiments across multiple cellular models and in vivo postmortem validation","pmids":["26224857"],"is_preprint":false},{"year":2015,"finding":"TRIB3 physically interacts with the autophagy receptor SQSTM1/p62 and hinders SQSTM1 binding to LC3 and ubiquitinated proteins, causing SQSTM1 accumulation and blockade of autophagic flux, which suppresses autophagic and proteasomal degradation of tumor-promoting factors and links insulin-IGF1 signaling to malignant promotion.","method":"Co-immunoprecipitation, autophagy flux assays, peptide competition (helical peptide from SQSTM1), siRNA knockdown, xenograft tumor models","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional peptide competition plus autophagic flux assays with in vivo validation in one study","pmids":["26301314"],"is_preprint":false},{"year":2017,"finding":"TRIB3 interacts with the oncoprotein PML-RARα and suppresses its sumoylation, ubiquitylation, and proteasomal degradation, thereby repressing PML nuclear body assembly, p53-mediated senescence, and myeloid differentiation to support APL-initiating cell self-renewal.","method":"Co-immunoprecipitation, ubiquitylation assay, sumoylation assay, genetic knockdown/overexpression, peptide disruption of TRIB3/PML-RARα interaction, APL mouse model","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, in vivo ubiquitylation/sumoylation assays, and epistasis in mouse models in one study","pmids":["28486108"],"is_preprint":false},{"year":2018,"finding":"TRIB3 physically interacts with β-catenin and TCF4, increasing recruitment of β-catenin and TCF4 to promoters of Wnt target genes, enhancing their transcription and supporting colorectal cancer stem cell features; activated β-catenin in turn increases TRIB3 expression, forming a positive feedback loop.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), dual luciferase reporter assay, shRNA knockdown, overexpression, ApcMin/J mouse model, organoid assays, xenograft models","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ChIP, reporter assay) replicated in multiple in vivo models","pmids":["30365932"],"is_preprint":false},{"year":2018,"finding":"TRIB3 acts as an adaptor to recruit lysine acetyltransferase KAT5 to SMAD3, inducing phosphorylation-dependent K333 acetylation of SMAD3, which sustains SMAD3 transcriptional activity and subsequently enhances TRIB3 transcription, forming a positive feedback loop. Metformin suppresses SMAD3 phosphorylation and disrupts the KAT5/SMAD3 interaction to break this loop.","method":"Co-immunoprecipitation, in vivo acetylation assay, site-directed mutagenesis (K333), reporter assays, knockdown/overexpression, mouse melanoma models","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP plus mutagenesis (K333) plus functional reporter assays in one study","pmids":["29520103"],"is_preprint":false},{"year":2019,"finding":"TRIB3 interacts with AKT to interfere with the FOXO1-AKT interaction, suppressing FOXO1 phosphorylation and its ubiquitination and degradation by E3 ligases SKP2 and NEDD4L; accumulated FOXO1 promotes SOX2 transcription, which in turn activates FOXO1 transcription, forming a positive regulatory loop supporting breast cancer stemness.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA/shRNA knockdown, overexpression, luciferase reporter assay, mouse breast cancer models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus reporter assays with in vivo mouse model validation","pmids":["31844113"],"is_preprint":false},{"year":2019,"finding":"TRIB3 interacts with SQSTM1/p62 and hinders its binding to MAP1LC3/LC3, causing accumulation of SQSTM1 aggregates and obstruction of autophagic flux. TRIB3-mediated autophagy impairment promotes hepatocellular secretion of INHBA/Activin A-enriched exosomes that activate hepatic stellate cells, driving liver fibrosis.","method":"Co-immunoprecipitation, autophagic flux assays, transmission electron microscopy, helical peptide disruption, AAV-mediated Trib3 knockdown, bile duct ligation and TAA mouse models","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus mechanistic flux assays plus in vivo mouse model with peptide intervention in one study","pmids":["31286822"],"is_preprint":false},{"year":2019,"finding":"TRIB3 interacts with TWIST1 via the TWIST1 WR domain and contributes to TWIST1 stabilization by inhibiting its ubiquitination, supporting APL cell survival and ATRA resistance.","method":"Co-immunoprecipitation, ubiquitination assay, gain- and loss-of-function experiments, peptide disruption of TRIB3/TWIST1 interaction, in vivo APL models","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay in single study with in vivo validation","pmids":["31235507"],"is_preprint":false},{"year":2020,"finding":"TRIB3 interacts with EGFR and recruits PKCα to induce Thr654 phosphorylation and WWP1-induced Lys689 ubiquitination in the EGFR juxtamembrane region, which enhances EGFR recycling, stability, downstream signaling activity, and NSCLC stemness.","method":"Co-immunoprecipitation, phosphorylation assay, ubiquitination assay, site-specific mutagenesis (Thr654, Lys689), stapled peptide disruption, overexpression/knockdown, NSCLC mouse models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP plus site-directed mutagenesis plus ubiquitination assays with in vivo validation in one study","pmids":["32694521"],"is_preprint":false},{"year":2020,"finding":"TRIB3 interacts with MYC to suppress E3 ubiquitin ligase UBE3B-mediated MYC ubiquitination and degradation, thereby enhancing MYC transcriptional activity and promoting lymphoma cell proliferation and self-renewal.","method":"Co-immunoprecipitation, ubiquitination assay, peptide disruption of TRIB3-MYC interaction, overexpression/knockdown, MycEμ mouse model, patient-derived xenografts","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus in vivo mouse and PDX validation in one study","pmids":["33298911"],"is_preprint":false},{"year":2020,"finding":"TRIB3 interacts with TAZ and impedes β-TrCP-mediated TAZ ubiquitination and degradation, thereby stabilizing TAZ and conferring radiotherapy resistance in esophageal squamous cell carcinoma cells.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, in vitro and in vivo radioresistance assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo validation, single lab","pmids":["32157210"],"is_preprint":false},{"year":2020,"finding":"TRIB3 interacts with PML-RARα to inhibit PPARγ activity by interfering with the PPARγ/RXR interaction and promoting PPARγ degradation, causing lipid metabolism disorder and dyslipidemia in APL. During arsenic/ATRA therapy, elevated TRIB3 disrupts the PPARγ/RXR dimer, exacerbating dyslipidemia.","method":"Co-immunoprecipitation, luciferase reporter assay, western blot, PML-RARα transgenic and APL cell-transplanted mouse models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assays with in vivo validation, single lab","pmids":["32929351"],"is_preprint":false},{"year":2020,"finding":"TRIB3 interacts with β-catenin and activates β-catenin signaling, increasing recruitment of β-catenin to promoters of Wnt-target genes and promoting lung cancer progression including EMT and stemness.","method":"Co-immunoprecipitation, ChIP assay, siRNA knockdown, overexpression, rescue with β-catenin reactivation","journal":"European journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP, single lab, consistent with colorectal cancer finding","pmids":["31562867"],"is_preprint":false},{"year":2020,"finding":"TRIB3 destabilizes PPARα by promoting its ubiquitination and proteasomal degradation in acute myeloid leukemia cells; TRIB3 physically interacts with PPARα as shown by co-immunoprecipitation and immunofluorescence, and in vivo ubiquitination assays confirmed TRIB3-enhanced PPARα ubiquitination.","method":"Co-immunoprecipitation, immunofluorescence co-localization, in vivo ubiquitination assay, siRNA knockdown, pharmacological rescue","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay with multiple orthogonal methods, single lab","pmids":["32621919"],"is_preprint":false},{"year":2021,"finding":"TRIB3 interacts with GSK-3β and stabilizes GSK-3β from ubiquitination and degradation; elevated GSK-3β then phosphorylates A20 to inhibit its ubiquitin-editing activity, causing C/EBPβ accumulation and profibrotic factor production in alveolar macrophages. Activated C/EBPβ in turn transcriptionally upregulates TRIB3 and GSK-3β, forming a positive feedback loop.","method":"Co-immunoprecipitation, ubiquitination assay, knockdown/overexpression, pharmacological disruption of TRIB3-GSK-3β interaction, bleomycin mouse model","journal":"Acta pharmaceutica Sinica. B","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo mouse model, single lab","pmids":["34729304"],"is_preprint":false},{"year":2022,"finding":"TRIB3 is acetylated by the acetyltransferase P300, which inhibits ubiquitination and subsequent proteasomal degradation of TRIB3. Ectopically expressed TRIB3 inhibits STAT1 activation and STAT1-mediated CXCL10 transcription by enhancing EGFR signaling, reducing CD8+ T cell infiltration in colorectal cancer.","method":"Co-immunoprecipitation, P300 inhibitor treatment, TRIB3 degradation assays, STAT1/CXCL10 reporter assays, CRC mouse models, genetic ablation of Trib3","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — acetylation mechanism with P300 inhibitor validation plus multiple mouse models with mechanistic pathway dissection in one study","pmids":["34985967"],"is_preprint":false},{"year":2022,"finding":"TRIB3 interacts with STAT3 and enhances STAT3-mediated transcriptional activity; through this interaction TRIB3 cooperates with STAT3 to increase VEGFA expression and promote cancer angiogenesis.","method":"Co-immunoprecipitation, ChIP assay, qPCR, western blot, in vitro angiogenesis assays, in vivo tumor models","journal":"Current medical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP, single lab","pmids":["36245025"],"is_preprint":false},{"year":2022,"finding":"TRIB3 interferes with the MLL histone methyltransferase complex and reduces MLL-mediated H3K4 trimethylation at the PPARG locus, thereby reducing PPARγ mRNA expression and blunting the antiproliferative effect of PPARγ ligands in breast cancer cells.","method":"Proteomics, phosphoproteomics, co-immunoprecipitation, histone methylation assays (H3K4me3 ChIP), overexpression/knockdown, proliferation assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP-based histone methylation measurement with proteomics, single lab","pmids":["36142452"],"is_preprint":false},{"year":2022,"finding":"TRIB3 negatively regulates ATF4 transcriptional activity; TRIB3 protein predominantly colocalizes with ATF4 on chromatin at C/EBP-ATF motif-containing genomic regions (demonstrated by ChIP-Seq using endogenous Flag-tagged TRIB3), and TRIB3 disruption increases ATF4-driven transcription and sensitizes hepatoma cells to bortezomib.","method":"ChIP-Seq with endogenously Flag-tagged TRIB3, CRISPR knock-in, transcriptome profiling, overexpression/disruption of TRIB3","journal":"Cancers","confidence":"High","confidence_rationale":"Tier 1 / Moderate — genome-wide ChIP-Seq with endogenous tagging plus transcriptomics in one study, rigorous method","pmids":["34066165"],"is_preprint":false},{"year":2022,"finding":"TRIB3 mediates fibroblast activation and fibrosis through interaction with ATF4; TRIB3 expression markedly inhibits ATF4 promoter-driven transcription and downregulates ATF4 expression, placing TRIB3 as a negative regulator of ATF4 in the context of pulmonary fibrosis.","method":"Overexpression/knockdown, ATF4 promoter-reporter assay, co-culture system, western blot","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — reporter assay and overexpression without direct Co-IP, single lab","pmids":["36555349"],"is_preprint":false},{"year":2024,"finding":"TRIB3 directly interacts with HNF4α and recruits the E3 ubiquitin ligase TRIM8 to form a complex that catalyzes K48-linked polyubiquitination of HNF4α on lysine 470, leading to HNF4α proteasomal degradation and NAFLD progression. A TRIB3 gain-of-function variant (p.Q84R) reduces HNF4α levels and worsens hepatic steatosis.","method":"Co-immunoprecipitation, mass spectrometry, in vivo and in vitro ubiquitination assays, site-directed mutagenesis (K470), molecular docking, cell-penetrating peptide disruption, mouse NAFLD model","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of E3 complex, K470 mutagenesis, MS identification, and in vivo validation in one study","pmids":["38237865"],"is_preprint":false},{"year":2024,"finding":"TRIB3 interacts with TCF4 and β-catenin forming a heterotrimeric complex that directly suppresses ALOXE3 promoter activity, thereby inhibiting ferroptosis in head and neck squamous cell carcinoma.","method":"Co-immunoprecipitation, ChIP (ALOXE3 promoter), TRIB3 knockdown, ALOXE3 knockdown rescue, ferroptosis assays, hesperidin inhibitor","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP with rescue experiment, single lab","pmids":["38429254"],"is_preprint":false},{"year":2024,"finding":"TRIB3 interacts with PLIN2 and abrogates TEB4-mediated PLIN2 ubiquitination and degradation, maintaining higher PLIN2 levels, facilitating lipid accumulation, preserving ER homeostasis, and driving renal cell carcinoma progression.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, bioinformatics analysis, in vitro functional assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay, single lab","pmids":["38561354"],"is_preprint":false},{"year":2025,"finding":"MET transcriptionally activates TRIB3 via the ERK/SP1 axis; TRIB3 then recruits the E3 ubiquitin ligase COP1 to facilitate ubiquitination and degradation of the tumor suppressor transcription factor FOXO1, upregulating MET, CCND1, and TWIST1 to promote hepatocellular carcinoma development.","method":"Co-immunoprecipitation, ubiquitination assay, qRT-PCR, western blot, immunofluorescence, in vitro and in vivo HCC models, AAV8-shTRIB3 liver-specific knockdown","journal":"Clinical and molecular hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo AAV knockdown, single lab","pmids":["40211872"],"is_preprint":false},{"year":2016,"finding":"TRIB3 expression in skeletal muscle mediates glucose-induced insulin resistance; muscle-specific TRIB3 overexpression exacerbates glucose-induced insulin resistance and decreases AKT phosphorylation, while muscle-specific TRIB3 knockout prevents these effects, establishing TRIB3 as a required mediator of glucose toxicity upstream of AKT in skeletal muscle insulin signaling.","method":"Muscle-specific TRIB3 overexpressing (MOE) and knockout (MKO) mouse models, insulin signaling assays (AKT phosphorylation), glucose tolerance tests, in vivo metabolic phenotyping","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using both muscle-specific KO and OE mice, replicated across diabetic and HFD models","pmids":["27207527"],"is_preprint":false},{"year":2016,"finding":"TRIB3 expression in skeletal muscle is regulated by nutrient availability (decreased under fasting, increased under nutrient excess), indicating a physiological role in metabolic homeostasis beyond pathological insulin resistance.","method":"Muscle-specific TRIB3 MOE and MKO mouse models, substrate metabolism assays, energy expenditure measurements","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic models with metabolic phenotyping, single study","pmids":["27207527"],"is_preprint":false},{"year":2012,"finding":"Trib3 mRNA expression in bone marrow-derived mast cells (BMMCs) is positively regulated by IL-3; Trib3-deficient BMMCs show delayed recovery after transient IL-3 deprivation, accelerated death during prolonged IL-3 starvation, and impaired IgE-dependent and pharmacologically induced degranulation, as well as reduced activation-induced cytokine mRNA expression.","method":"Trib3 knockout mouse-derived BMMCs, IL-3 deprivation assays, degranulation assays, cytokine mRNA measurement","journal":"Cellular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model with defined cellular phenotypes, single lab","pmids":["23261831"],"is_preprint":false},{"year":2016,"finding":"TRIB3 expression in cells is regulated at the level of mRNA translation; during anoxia, TRIB3 mRNA translation is profoundly inhibited, producing a discordance between TRIB3 mRNA and protein levels. TRIB3 protein is stable with levels not controlled by rapid protein breakdown.","method":"Translational control assays, anoxia treatment, miRNA-24 manipulation, protein stability assays in breast cancer cell lines and patient specimens","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct measurement of translation rates and protein stability, single lab","pmids":["23185332"],"is_preprint":false},{"year":2016,"finding":"TRIB3 suppresses Chac1 (a glutathione-degrading enzyme) expression during arsenite stress; Trib3-deficient cells show markedly elevated CHAC1 expression, accelerated glutathione consumption, and increased susceptibility to arsenite-induced cell death. This suppression is mediated through regulatory elements in the Chac1 promoter and operates within the ATF4 pathway.","method":"Trib3 knockout mouse embryonic fibroblasts, Chac1 promoter reporter assays, siRNA knockdown of Chac1, glutathione measurement, cell death assays","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO plus promoter reporter plus siRNA rescue with biochemical readout (glutathione), multiple orthogonal methods","pmids":["27526673"],"is_preprint":false},{"year":2020,"finding":"TRIB3 induction in PD models is driven by the transcription factor complex CHOP/ATF4; the drug adaptaquin inhibits ATF4-dependent transcription, suppresses Trib3 induction, preserves Parkin levels, and protects dopaminergic neurons in both cellular and 6-OHDA mouse models of PD.","method":"Neuronal PC12 cells, ventral midbrain dopaminergic neuron cultures, 6-OHDA mouse model, adaptaquin pharmacological treatment, ATF4/CHOP level measurement, Trib3 and Parkin quantification","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis in cellular and in vivo models, single lab","pmids":["31911115"],"is_preprint":false},{"year":2023,"finding":"ATF4 binds to a specific region of the TRIB3 promoter to transcriptionally upregulate TRIB3 in hepatic stellate cells under mitochondrial stress; TRIB3 in turn promotes HSC activation, and AAV8-shRNA-Atf4 alleviates liver fibrosis in rats by reducing TRIB3 expression.","method":"ChIP assay (ATF4 binding to TRIB3 promoter), AAV8-shRNA knockdown, CCl4 rat fibrosis model, PDGF-BB in vitro model, western blot","journal":"Journal of gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay demonstrating direct ATF4-TRIB3 promoter binding with in vivo genetic intervention, single lab","pmids":["37150773"],"is_preprint":false},{"year":2024,"finding":"OC-derived TGF-β1 activates SMAD3 phosphorylation in adipocytes, which upregulates TRIB3; TRIB3 then suppresses phosphorylation of C/EBPβ, driving adipocyte dedifferentiation into cancer-associated adipocytes that remodel the extracellular matrix to form a pre-metastatic niche for ovarian cancer.","method":"Co-immunoprecipitation-based pathway analysis, pharmacological TGF-β1/SMAD3 inhibition, western blot, in vitro co-culture, in vivo metastasis models","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway placement by western blot and inhibitor without direct Co-IP for TRIB3-C/EBPβ, single lab","pmids":["39719444"],"is_preprint":false}],"current_model":"TRIB3 is a stress-inducible pseudokinase scaffold that operates at the intersection of multiple signaling pathways by physically recruiting, stabilizing, or destabilizing key regulatory proteins: it suppresses AKT-mediated FOXO1 phosphorylation and degradation; blocks SQSTM1/p62 from binding LC3 to impair autophagic flux; inhibits ATF4 transcriptional activity by colocalizing with it on chromatin at C/EBP-ATF motifs; stabilizes oncoproteins (PML-RARα, MYC, TWIST1, TAZ, EGFR, PLIN2) by suppressing their ubiquitination; promotes NF-κB inhibition by interacting with p65 and blocking PKA-mediated p65 phosphorylation; drives HNF4α and PPARα/γ degradation through E3 ligase complexes (TRIM8, COP1); recruits KAT5 to SMAD3 to sustain SMAD3 acetylation and transcriptional activity; interacts with GSK-3β to stabilize it from degradation; and forms a prodeath axis with Parkin in neurons, placing it as a central stress-responsive scaffold that integrates ER stress, insulin/AKT, Wnt/β-catenin, autophagy, and ubiquitin-proteasome pathways depending on cellular context."},"narrative":{"mechanistic_narrative":"TRIB3 is a stress-inducible pseudokinase scaffold that integrates ER stress, insulin/AKT, Wnt/β-catenin, autophagy, and ubiquitin-proteasome signaling by physically recruiting, stabilizing, or destabilizing regulatory proteins in a context-dependent manner [PMID:12736262, PMID:34066165, PMID:27207527]. Originally identified as an NF-κB-inducible protein (SINK) that binds the p65 transactivator and blocks its PKA-mediated phosphorylation to suppress NF-κB transcription while sensitizing cells to TNF/TRAIL apoptosis [PMID:12736262], TRIB3 negatively regulates the ER-stress transcription factor ATF4, with which it colocalizes on chromatin at C/EBP-ATF motifs [PMID:34066165]. TRIB3 is itself induced by ATF4/CHOP, establishing recurrent feedback circuits in which the pathways it modulates also drive its expression [PMID:29520103, PMID:31844113, PMID:34729304, PMID:37150773]. A dominant theme is its control of protein stability: TRIB3 stabilizes oncoproteins by blocking their ubiquitination—PML-RARα (also suppressing sumoylation) [PMID:28486108], MYC (against UBE3B) [PMID:33298911], TWIST1 [PMID:31235507], TAZ (against β-TrCP) [PMID:32157210], EGFR (with PKCα/WWP1-driven juxtamembrane modification enhancing recycling) [PMID:32694521], and PLIN2 (against TEB4) [PMID:38561354]—while conversely recruiting E3 ligases to destabilize tumor suppressors and metabolic regulators, driving TRIM8-dependent K48 polyubiquitination of HNF4α [PMID:38237865], COP1-dependent FOXO1 degradation [PMID:40211872], and degradation of PPARα/PPARγ [PMID:32929351, PMID:32621919]. TRIB3 also impairs autophagic flux by binding SQSTM1/p62 and blocking its LC3 interaction, causing p62 accumulation that suppresses degradation of tumor-promoting factors and promotes liver fibrosis [PMID:26301314, PMID:31286822]. As a transcriptional adaptor it potentiates Wnt/β-catenin-TCF4 [PMID:30365932, PMID:31562867, PMID:38429254], SMAD3 (by recruiting KAT5 to sustain SMAD3 acetylation) [PMID:29520103], AKT-FOXO1-SOX2 [PMID:31844113], and STAT3-VEGFA [PMID:36245025] programs. In metabolic tissue TRIB3 is required for glucose-induced insulin resistance upstream of AKT in skeletal muscle [PMID:27207527], and a gain-of-function variant (p.Q84R) worsens hepatic steatosis via enhanced HNF4α degradation [PMID:38237865].","teleology":[{"year":2003,"claim":"Established TRIB3's first molecular role: how an NF-κB target gene feeds back to restrain NF-κB signaling, identifying TRIB3 as a transcriptional brake and apoptotic sensitizer.","evidence":"Co-IP, in vitro PKA kinase assay, and NF-κB reporter assays in overexpression systems","pmids":["12736262"],"confidence":"High","gaps":["Mechanism by which TRIB3 blocks PKA access to p65 not structurally defined","Physiological NF-κB contexts beyond TNF/TRAIL untested"]},{"year":2012,"claim":"Showed TRIB3 supports immune cell survival and effector function, broadening its role beyond transcriptional suppression to cytokine-dependent cell fate.","evidence":"Trib3-knockout mouse-derived BMMCs assayed for IL-3 deprivation survival, degranulation, and cytokine mRNA","pmids":["23261831"],"confidence":"Medium","gaps":["Molecular partners mediating mast cell survival not identified","Link to IL-3 signaling components undefined"]},{"year":2015,"claim":"Defined two distinct TRIB3 mechanisms—an autophagy block via SQSTM1/p62 and a prodeath neuronal axis via Parkin—revealing context-dependent pro-tumor versus pro-death outputs.","evidence":"Co-IP, autophagic flux assays with peptide competition, and genetic epistasis in tumor and neuronal models plus postmortem PD tissue","pmids":["26301314","26224857"],"confidence":"High","gaps":["How the same scaffold yields opposite cell-fate outcomes across tissues unresolved","Whether Parkin reduction is degradative or transcriptional unclear"]},{"year":2016,"claim":"Established TRIB3 as a required, nutrient-regulated mediator of glucose toxicity upstream of AKT in skeletal muscle, anchoring its physiological role in metabolic homeostasis.","evidence":"Muscle-specific TRIB3 overexpression and knockout mice with insulin signaling and metabolic phenotyping","pmids":["27207527"],"confidence":"High","gaps":["Direct molecular target in muscle AKT pathway not pinned down","Relationship to TRIB3-AKT-FOXO1 interaction defined later not integrated"]},{"year":2016,"claim":"Showed TRIB3 abundance is governed by mRNA translation and protein stability, and that TRIB3 suppresses CHAC1 within the ATF4 pathway to control glutathione and stress survival.","evidence":"Translational control and protein stability assays in cancer cells; Trib3-knockout MEFs with Chac1 promoter reporters and glutathione measurement","pmids":["23185332","27526673"],"confidence":"High","gaps":["How TRIB3 acts on the Chac1 promoter mechanistically undefined","Translation control of TRIB3 in non-anoxic contexts untested"]},{"year":2018,"claim":"Revealed TRIB3 as a transcriptional adaptor that enhances Wnt/β-catenin-TCF4 and SMAD3 programs through chromatin recruitment and KAT5-mediated acetylation, embedded in self-reinforcing feedback loops.","evidence":"Co-IP, ChIP, reporter assays, K333 acetylation mutagenesis in colorectal and melanoma models","pmids":["30365932","29520103"],"confidence":"High","gaps":["Whether TRIB3 directly contacts chromatin or bridges factors unclear","Structural basis of KAT5 recruitment to SMAD3 unknown"]},{"year":2017,"claim":"Identified the recurrent oncoprotein-stabilization mechanism: TRIB3 binds substrates and blocks their ubiquitin/sumo-dependent degradation, first shown for PML-RARα.","evidence":"Co-IP, ubiquitylation/sumoylation assays, peptide disruption, and APL mouse model","pmids":["28486108"],"confidence":"High","gaps":["Which E3 ligases TRIB3 displaces from PML-RARα not fully resolved","Generality across substrates not yet established at this point"]},{"year":2019,"claim":"Generalized the stabilization paradigm across oncoproteins (TWIST1, MYC-pending, EGFR) and extended autophagy blockade to fibrosis, while linking TRIB3-AKT to FOXO1-SOX2 stemness circuits.","evidence":"Co-IP, ubiquitination/phosphorylation assays, site-directed mutagenesis, stapled/helical peptide disruption across leukemia, lung, breast, and liver fibrosis models","pmids":["31235507","32694521","31844113","31286822"],"confidence":"High","gaps":["Whether TRIB3 recognizes a shared degron motif across substrates unknown","How one scaffold both blocks and recruits E3 ligases mechanistically unresolved"]},{"year":2020,"claim":"Expanded the dual stabilize/destabilize logic—stabilizing MYC and TAZ while promoting PPARα/γ degradation—and confirmed feedback control via CHOP/ATF4-driven TRIB3 induction in PD.","evidence":"Co-IP, ubiquitination and reporter assays, pharmacological ATF4 inhibition (adaptaquin) across lymphoma, esophageal, leukemia, lung, and PD models","pmids":["33298911","32157210","32929351","32621919","31562867","31911115"],"confidence":"Medium","gaps":["Determinants selecting stabilization versus degradation for a given partner unknown","Most substrate findings from single labs without reciprocal cross-validation"]},{"year":2022,"claim":"Provided genome-wide evidence that TRIB3 colocalizes with ATF4 on chromatin to restrain its transcription, and showed TRIB3 is itself stabilized by P300 acetylation while suppressing antitumor immunity via EGFR/STAT1/CXCL10.","evidence":"Endogenous Flag-tagged TRIB3 ChIP-Seq, transcriptomics, P300 acetylation/degradation assays, and CRC mouse models","pmids":["34066165","34985967","36245025","36142452","36555349"],"confidence":"High","gaps":["Whether TRIB3 binds DNA directly or via ATF4 unresolved","Mechanism of MLL complex interference at PPARG locus not structurally defined"]},{"year":2024,"claim":"Reconstituted TRIB3 as an E3-ligase adaptor driving substrate degradation, defining TRIM8-mediated K48 ubiquitination of HNF4α at K470 and a disease-causing gain-of-function variant, alongside COP1-FOXO1 and TEB4-PLIN2 axes.","evidence":"Co-IP, mass spectrometry, in vivo/in vitro ubiquitination, K470 mutagenesis, peptide disruption, and mouse NAFLD/HCC/RCC models","pmids":["38237865","38561354","38429254","40211872"],"confidence":"High","gaps":["How TRIB3 chooses to recruit versus exclude specific E3 ligases unknown","Structural basis of the TRIB3-TRIM8-HNF4α complex not solved"]},{"year":null,"claim":"It remains unknown what structural feature of the TRIB3 pseudokinase scaffold dictates whether a given partner is stabilized or targeted for degradation, and whether a unifying recognition motif governs substrate selection across its many contexts.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of TRIB3 bound to any partner reported in the corpus","No common degron or binding motif identified across substrates","Tissue-specific determinants of opposing outputs uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5,21,24]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[21,24,3,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,19]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[4,19,5]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[19]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[19,4,14]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,7]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[19,4]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,10,21,24,23]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[2,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,6,25]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,19,4,5]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[19,29,30]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[25,21,23,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[21,25,1]}],"complexes":["TRIB3-TRIM8-HNF4α ubiquitination complex","TRIB3-β-catenin-TCF4 complex"],"partners":["RELA","SQSTM1","ATF4","CTNNB1","SMAD3","MYC","EGFR","HNF4A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96RU7","full_name":"Tribbles homolog 3","aliases":["Neuronal cell death-inducible putative kinase","SINK","p65-interacting 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Inhibits the transcriptional activity of DDIT3/CHOP and is involved in DDIT3/CHOP-dependent cell death during ER stress (PubMed:15775988, PubMed:15781252). May play a role in programmed neuronal cell death but does not appear to affect non-neuronal cells (PubMed:15775988, PubMed:15781252). Acts as a negative feedback regulator of the ATF4-dependent transcription during the ISR: while TRIB3 expression is promoted by ATF4, TRIB3 protein interacts with ATF4 and inhibits ATF4 transcription activity (By similarity). Disrupts insulin signaling by binding directly to Akt kinases and blocking their activation (By similarity). May bind directly to and mask the 'Thr-308' phosphorylation site in AKT1 (By similarity). Interacts with the NF-kappa-B transactivator p65 RELA and inhibits its phosphorylation and thus its transcriptional activation activity (PubMed:12736262). Interacts with MAPK kinases and regulates activation of MAP kinases (PubMed:15299019). Can inhibit APOBEC3A editing of nuclear DNA (PubMed:22977230)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96RU7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIB3","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRIB3","total_profiled":1310},"omim":[{"mim_id":"615895","title":"POLYGLUCOSAN BODY MYOPATHY 1 WITH OR WITHOUT IMMUNODEFICIENCY; PGBM1","url":"https://www.omim.org/entry/615895"},{"mim_id":"610924","title":"RANBP-TYPE AND C3HC4-TYPE ZINC FINGER-CONTAINING 1; RBCK1","url":"https://www.omim.org/entry/610924"},{"mim_id":"609462","title":"TRIBBLES PSEUDOKINASE 2; TRIB2","url":"https://www.omim.org/entry/609462"},{"mim_id":"609461","title":"TRIBBLES PSEUDOKINASE 1; TRIB1","url":"https://www.omim.org/entry/609461"},{"mim_id":"609437","title":"SERINE/THREONINE PROTEIN KINASE 40; STK40","url":"https://www.omim.org/entry/609437"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"liver","ntpm":80.6}],"url":"https://www.proteinatlas.org/search/TRIB3"},"hgnc":{"alias_symbol":["dJ1103G7.3","TRB3","SINK"],"prev_symbol":["C20orf97"]},"alphafold":{"accession":"Q96RU7","domains":[{"cath_id":"3.30.200.20","chopping":"67-139","consensus_level":"high","plddt":92.2547,"start":67,"end":139},{"cath_id":"1.10.510.10","chopping":"143-316","consensus_level":"high","plddt":94.7816,"start":143,"end":316}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96RU7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96RU7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96RU7-F1-predicted_aligned_error_v6.png","plddt_mean":77.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIB3","jax_strain_url":"https://www.jax.org/strain/search?query=TRIB3"},"sequence":{"accession":"Q96RU7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96RU7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96RU7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96RU7"}},"corpus_meta":[{"pmid":"20303820","id":"PMC_20303820","title":"Source 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carcinoma by upregulating the lipid droplet-associated protein PLIN2.","date":"2024","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/38561354","citation_count":20,"is_preprint":false},{"pmid":"25601649","id":"PMC_25601649","title":"TRIB3 mediates the expression of Wnt5a and activation of nuclear factor-κB in Porphyromonas endodontalis lipopolysaccharide-treated osteoblasts.","date":"2015","source":"Molecular oral microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/25601649","citation_count":20,"is_preprint":false},{"pmid":"34957220","id":"PMC_34957220","title":"The Involvement of TRIB3 and FABP1 and Their Potential Functions in the Dynamic Process of Gastric Cancer.","date":"2021","source":"Frontiers in molecular biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/34957220","citation_count":19,"is_preprint":false},{"pmid":"28871113","id":"PMC_28871113","title":"TRIB3 inhibits proliferation and promotes osteogenesis in hBMSCs by regulating the ERK1/2 signaling pathway.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28871113","citation_count":19,"is_preprint":false},{"pmid":"34718616","id":"PMC_34718616","title":"TRIB3 Is Highly Expressed in the Adipose Tissue of Obese Patients and Is Associated With Insulin Resistance.","date":"2022","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/34718616","citation_count":19,"is_preprint":false},{"pmid":"31995275","id":"PMC_31995275","title":"TRIB3 confers glioma cell stemness via interacting with β-catenin.","date":"2020","source":"Environmental toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/31995275","citation_count":18,"is_preprint":false},{"pmid":"33807580","id":"PMC_33807580","title":"Sink Strength Maintenance Underlies Drought Tolerance in Common Bean.","date":"2021","source":"Plants (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/33807580","citation_count":18,"is_preprint":false},{"pmid":"33717256","id":"PMC_33717256","title":"TRIB3 promotes oral squamous cell carcinoma cell proliferation by activating the AKT signaling pathway.","date":"2021","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33717256","citation_count":17,"is_preprint":false},{"pmid":"34066165","id":"PMC_34066165","title":"Pharmacological or TRIB3-Mediated Suppression of ATF4 Transcriptional Activity Promotes Hepatoma Cell Resistance to Proteasome Inhibitor Bortezomib.","date":"2021","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/34066165","citation_count":17,"is_preprint":false},{"pmid":"27526673","id":"PMC_27526673","title":"TRIB3 increases cell resistance to arsenite toxicity by limiting the expression of the glutathione-degrading enzyme CHAC1.","date":"2016","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/27526673","citation_count":17,"is_preprint":false},{"pmid":"35893060","id":"PMC_35893060","title":"Source-To-Sink Transport of Sugar and Its Role in Male Reproductive Development.","date":"2022","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/35893060","citation_count":16,"is_preprint":false},{"pmid":"28442401","id":"PMC_28442401","title":"TRIB3 downregulation enhances doxorubicin-induced cytotoxicity in gastric cancer cells.","date":"2017","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/28442401","citation_count":16,"is_preprint":false},{"pmid":"40211872","id":"PMC_40211872","title":"MET promotes hepatocellular carcinoma development through the promotion of TRIB3-mediated FOXO1 degradation.","date":"2025","source":"Clinical and molecular hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/40211872","citation_count":15,"is_preprint":false},{"pmid":"35788477","id":"PMC_35788477","title":"Perfluorooctanoic acid promotes pancreatic β cell dysfunction and apoptosis through ER stress and the ATF4/CHOP/TRIB3 pathway.","date":"2022","source":"Environmental science and pollution research international","url":"https://pubmed.ncbi.nlm.nih.gov/35788477","citation_count":15,"is_preprint":false},{"pmid":"39454374","id":"PMC_39454374","title":"Cepharanthine sensitizes gastric cancer cells to chemotherapy by targeting TRIB3-FOXO3-FOXM1 axis to inhibit autophagy.","date":"2024","source":"Phytomedicine : international journal of phytotherapy and phytopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/39454374","citation_count":14,"is_preprint":false},{"pmid":"36245025","id":"PMC_36245025","title":"TRIB3 Interacts with STAT3 to Promote Cancer Angiogenesis.","date":"2022","source":"Current medical science","url":"https://pubmed.ncbi.nlm.nih.gov/36245025","citation_count":14,"is_preprint":false},{"pmid":"36142452","id":"PMC_36142452","title":"TRIB3 Modulates PPARγ-Mediated Growth Inhibition by Interfering with the MLL Complex in Breast Cancer Cells.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36142452","citation_count":14,"is_preprint":false},{"pmid":"33856595","id":"PMC_33856595","title":"CHOP Increases TRIB3-Dependent miR-208 Expression to Potentiate Vascular Smooth Muscle Cell Proliferation and Migration by Downregulating TIMP3 in Atherosclerosis.","date":"2021","source":"Cardiovascular drugs and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/33856595","citation_count":14,"is_preprint":false},{"pmid":"39719444","id":"PMC_39719444","title":"Ovarian cancer-derived TGF-β1 induces cancer-associated adipocytes formation by activating SMAD3/TRIB3 pathway to establish pre-metastatic niche.","date":"2024","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/39719444","citation_count":13,"is_preprint":false},{"pmid":"39299601","id":"PMC_39299601","title":"TRIB3 knockdown increases the sensitivity of clear cell renal cell carcinoma to sunitinib by inducing ferroptosis.","date":"2024","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/39299601","citation_count":13,"is_preprint":false},{"pmid":"37922125","id":"PMC_37922125","title":"The chromatin source-sink hypothesis: a shared mode of chromatin-mediated regulations.","date":"2023","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/37922125","citation_count":13,"is_preprint":false},{"pmid":"37150773","id":"PMC_37150773","title":"Mitochondrial stress induces hepatic stellate cell activation in response to the ATF4/TRIB3 pathway stimulation.","date":"2023","source":"Journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/37150773","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49377,"output_tokens":8151,"usd":0.135198,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17919,"output_tokens":4892,"usd":0.105948,"stage2_stop_reason":"end_turn"},"total_usd":0.241146,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"TRIB3 (identified as SINK) is an NF-κB-inducible protein that specifically interacts with the NF-κB transactivator p65 and inhibits p65 phosphorylation by the catalytic subunit of protein kinase A (PKA), thereby suppressing NF-κB-dependent transcription without blocking NF-κB nuclear translocation or DNA binding. TRIB3 also sensitizes cells to TNF- and TRAIL-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, NF-κB reporter assay, overexpression studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reciprocal Co-IP plus in vitro kinase assay in the same study, with functional reporter assay validation\",\n      \"pmids\": [\"12736262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIB3 physically interacts with Parkin, a prosurvival E3 ubiquitin ligase associated with Parkinson's disease. Elevated TRIB3 reduces Parkin expression in cultured neurons; Parkin knockdown abolishes the neuroprotective effect of TRIB3 downregulation, placing TRIB3 upstream of Parkin in a prodeath pathway. TRIB3 induction in PD models is substantially mediated by transcription factors CHOP and ATF4.\",\n      \"method\": \"Co-immunoprecipitation (physical interaction), siRNA knockdown, overexpression, genetic epistasis (double knockdown), immunostaining in postmortem PD brain tissue\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus epistasis experiments across multiple cellular models and in vivo postmortem validation\",\n      \"pmids\": [\"26224857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIB3 physically interacts with the autophagy receptor SQSTM1/p62 and hinders SQSTM1 binding to LC3 and ubiquitinated proteins, causing SQSTM1 accumulation and blockade of autophagic flux, which suppresses autophagic and proteasomal degradation of tumor-promoting factors and links insulin-IGF1 signaling to malignant promotion.\",\n      \"method\": \"Co-immunoprecipitation, autophagy flux assays, peptide competition (helical peptide from SQSTM1), siRNA knockdown, xenograft tumor models\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional peptide competition plus autophagic flux assays with in vivo validation in one study\",\n      \"pmids\": [\"26301314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIB3 interacts with the oncoprotein PML-RARα and suppresses its sumoylation, ubiquitylation, and proteasomal degradation, thereby repressing PML nuclear body assembly, p53-mediated senescence, and myeloid differentiation to support APL-initiating cell self-renewal.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assay, sumoylation assay, genetic knockdown/overexpression, peptide disruption of TRIB3/PML-RARα interaction, APL mouse model\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, in vivo ubiquitylation/sumoylation assays, and epistasis in mouse models in one study\",\n      \"pmids\": [\"28486108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIB3 physically interacts with β-catenin and TCF4, increasing recruitment of β-catenin and TCF4 to promoters of Wnt target genes, enhancing their transcription and supporting colorectal cancer stem cell features; activated β-catenin in turn increases TRIB3 expression, forming a positive feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), dual luciferase reporter assay, shRNA knockdown, overexpression, ApcMin/J mouse model, organoid assays, xenograft models\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ChIP, reporter assay) replicated in multiple in vivo models\",\n      \"pmids\": [\"30365932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIB3 acts as an adaptor to recruit lysine acetyltransferase KAT5 to SMAD3, inducing phosphorylation-dependent K333 acetylation of SMAD3, which sustains SMAD3 transcriptional activity and subsequently enhances TRIB3 transcription, forming a positive feedback loop. Metformin suppresses SMAD3 phosphorylation and disrupts the KAT5/SMAD3 interaction to break this loop.\",\n      \"method\": \"Co-immunoprecipitation, in vivo acetylation assay, site-directed mutagenesis (K333), reporter assays, knockdown/overexpression, mouse melanoma models\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP plus mutagenesis (K333) plus functional reporter assays in one study\",\n      \"pmids\": [\"29520103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIB3 interacts with AKT to interfere with the FOXO1-AKT interaction, suppressing FOXO1 phosphorylation and its ubiquitination and degradation by E3 ligases SKP2 and NEDD4L; accumulated FOXO1 promotes SOX2 transcription, which in turn activates FOXO1 transcription, forming a positive regulatory loop supporting breast cancer stemness.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA/shRNA knockdown, overexpression, luciferase reporter assay, mouse breast cancer models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus reporter assays with in vivo mouse model validation\",\n      \"pmids\": [\"31844113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIB3 interacts with SQSTM1/p62 and hinders its binding to MAP1LC3/LC3, causing accumulation of SQSTM1 aggregates and obstruction of autophagic flux. TRIB3-mediated autophagy impairment promotes hepatocellular secretion of INHBA/Activin A-enriched exosomes that activate hepatic stellate cells, driving liver fibrosis.\",\n      \"method\": \"Co-immunoprecipitation, autophagic flux assays, transmission electron microscopy, helical peptide disruption, AAV-mediated Trib3 knockdown, bile duct ligation and TAA mouse models\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus mechanistic flux assays plus in vivo mouse model with peptide intervention in one study\",\n      \"pmids\": [\"31286822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIB3 interacts with TWIST1 via the TWIST1 WR domain and contributes to TWIST1 stabilization by inhibiting its ubiquitination, supporting APL cell survival and ATRA resistance.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, gain- and loss-of-function experiments, peptide disruption of TRIB3/TWIST1 interaction, in vivo APL models\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay in single study with in vivo validation\",\n      \"pmids\": [\"31235507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 interacts with EGFR and recruits PKCα to induce Thr654 phosphorylation and WWP1-induced Lys689 ubiquitination in the EGFR juxtamembrane region, which enhances EGFR recycling, stability, downstream signaling activity, and NSCLC stemness.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assay, ubiquitination assay, site-specific mutagenesis (Thr654, Lys689), stapled peptide disruption, overexpression/knockdown, NSCLC mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP plus site-directed mutagenesis plus ubiquitination assays with in vivo validation in one study\",\n      \"pmids\": [\"32694521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 interacts with MYC to suppress E3 ubiquitin ligase UBE3B-mediated MYC ubiquitination and degradation, thereby enhancing MYC transcriptional activity and promoting lymphoma cell proliferation and self-renewal.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, peptide disruption of TRIB3-MYC interaction, overexpression/knockdown, MycEμ mouse model, patient-derived xenografts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus in vivo mouse and PDX validation in one study\",\n      \"pmids\": [\"33298911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 interacts with TAZ and impedes β-TrCP-mediated TAZ ubiquitination and degradation, thereby stabilizing TAZ and conferring radiotherapy resistance in esophageal squamous cell carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, in vitro and in vivo radioresistance assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo validation, single lab\",\n      \"pmids\": [\"32157210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 interacts with PML-RARα to inhibit PPARγ activity by interfering with the PPARγ/RXR interaction and promoting PPARγ degradation, causing lipid metabolism disorder and dyslipidemia in APL. During arsenic/ATRA therapy, elevated TRIB3 disrupts the PPARγ/RXR dimer, exacerbating dyslipidemia.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, western blot, PML-RARα transgenic and APL cell-transplanted mouse models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assays with in vivo validation, single lab\",\n      \"pmids\": [\"32929351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 interacts with β-catenin and activates β-catenin signaling, increasing recruitment of β-catenin to promoters of Wnt-target genes and promoting lung cancer progression including EMT and stemness.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, siRNA knockdown, overexpression, rescue with β-catenin reactivation\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP, single lab, consistent with colorectal cancer finding\",\n      \"pmids\": [\"31562867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 destabilizes PPARα by promoting its ubiquitination and proteasomal degradation in acute myeloid leukemia cells; TRIB3 physically interacts with PPARα as shown by co-immunoprecipitation and immunofluorescence, and in vivo ubiquitination assays confirmed TRIB3-enhanced PPARα ubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, in vivo ubiquitination assay, siRNA knockdown, pharmacological rescue\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay with multiple orthogonal methods, single lab\",\n      \"pmids\": [\"32621919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIB3 interacts with GSK-3β and stabilizes GSK-3β from ubiquitination and degradation; elevated GSK-3β then phosphorylates A20 to inhibit its ubiquitin-editing activity, causing C/EBPβ accumulation and profibrotic factor production in alveolar macrophages. Activated C/EBPβ in turn transcriptionally upregulates TRIB3 and GSK-3β, forming a positive feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockdown/overexpression, pharmacological disruption of TRIB3-GSK-3β interaction, bleomycin mouse model\",\n      \"journal\": \"Acta pharmaceutica Sinica. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo mouse model, single lab\",\n      \"pmids\": [\"34729304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIB3 is acetylated by the acetyltransferase P300, which inhibits ubiquitination and subsequent proteasomal degradation of TRIB3. Ectopically expressed TRIB3 inhibits STAT1 activation and STAT1-mediated CXCL10 transcription by enhancing EGFR signaling, reducing CD8+ T cell infiltration in colorectal cancer.\",\n      \"method\": \"Co-immunoprecipitation, P300 inhibitor treatment, TRIB3 degradation assays, STAT1/CXCL10 reporter assays, CRC mouse models, genetic ablation of Trib3\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — acetylation mechanism with P300 inhibitor validation plus multiple mouse models with mechanistic pathway dissection in one study\",\n      \"pmids\": [\"34985967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIB3 interacts with STAT3 and enhances STAT3-mediated transcriptional activity; through this interaction TRIB3 cooperates with STAT3 to increase VEGFA expression and promote cancer angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, qPCR, western blot, in vitro angiogenesis assays, in vivo tumor models\",\n      \"journal\": \"Current medical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP, single lab\",\n      \"pmids\": [\"36245025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIB3 interferes with the MLL histone methyltransferase complex and reduces MLL-mediated H3K4 trimethylation at the PPARG locus, thereby reducing PPARγ mRNA expression and blunting the antiproliferative effect of PPARγ ligands in breast cancer cells.\",\n      \"method\": \"Proteomics, phosphoproteomics, co-immunoprecipitation, histone methylation assays (H3K4me3 ChIP), overexpression/knockdown, proliferation assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP-based histone methylation measurement with proteomics, single lab\",\n      \"pmids\": [\"36142452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIB3 negatively regulates ATF4 transcriptional activity; TRIB3 protein predominantly colocalizes with ATF4 on chromatin at C/EBP-ATF motif-containing genomic regions (demonstrated by ChIP-Seq using endogenous Flag-tagged TRIB3), and TRIB3 disruption increases ATF4-driven transcription and sensitizes hepatoma cells to bortezomib.\",\n      \"method\": \"ChIP-Seq with endogenously Flag-tagged TRIB3, CRISPR knock-in, transcriptome profiling, overexpression/disruption of TRIB3\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — genome-wide ChIP-Seq with endogenous tagging plus transcriptomics in one study, rigorous method\",\n      \"pmids\": [\"34066165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIB3 mediates fibroblast activation and fibrosis through interaction with ATF4; TRIB3 expression markedly inhibits ATF4 promoter-driven transcription and downregulates ATF4 expression, placing TRIB3 as a negative regulator of ATF4 in the context of pulmonary fibrosis.\",\n      \"method\": \"Overexpression/knockdown, ATF4 promoter-reporter assay, co-culture system, western blot\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — reporter assay and overexpression without direct Co-IP, single lab\",\n      \"pmids\": [\"36555349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIB3 directly interacts with HNF4α and recruits the E3 ubiquitin ligase TRIM8 to form a complex that catalyzes K48-linked polyubiquitination of HNF4α on lysine 470, leading to HNF4α proteasomal degradation and NAFLD progression. A TRIB3 gain-of-function variant (p.Q84R) reduces HNF4α levels and worsens hepatic steatosis.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, in vivo and in vitro ubiquitination assays, site-directed mutagenesis (K470), molecular docking, cell-penetrating peptide disruption, mouse NAFLD model\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of E3 complex, K470 mutagenesis, MS identification, and in vivo validation in one study\",\n      \"pmids\": [\"38237865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIB3 interacts with TCF4 and β-catenin forming a heterotrimeric complex that directly suppresses ALOXE3 promoter activity, thereby inhibiting ferroptosis in head and neck squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ChIP (ALOXE3 promoter), TRIB3 knockdown, ALOXE3 knockdown rescue, ferroptosis assays, hesperidin inhibitor\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP with rescue experiment, single lab\",\n      \"pmids\": [\"38429254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIB3 interacts with PLIN2 and abrogates TEB4-mediated PLIN2 ubiquitination and degradation, maintaining higher PLIN2 levels, facilitating lipid accumulation, preserving ER homeostasis, and driving renal cell carcinoma progression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, bioinformatics analysis, in vitro functional assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay, single lab\",\n      \"pmids\": [\"38561354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MET transcriptionally activates TRIB3 via the ERK/SP1 axis; TRIB3 then recruits the E3 ubiquitin ligase COP1 to facilitate ubiquitination and degradation of the tumor suppressor transcription factor FOXO1, upregulating MET, CCND1, and TWIST1 to promote hepatocellular carcinoma development.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, qRT-PCR, western blot, immunofluorescence, in vitro and in vivo HCC models, AAV8-shTRIB3 liver-specific knockdown\",\n      \"journal\": \"Clinical and molecular hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo AAV knockdown, single lab\",\n      \"pmids\": [\"40211872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIB3 expression in skeletal muscle mediates glucose-induced insulin resistance; muscle-specific TRIB3 overexpression exacerbates glucose-induced insulin resistance and decreases AKT phosphorylation, while muscle-specific TRIB3 knockout prevents these effects, establishing TRIB3 as a required mediator of glucose toxicity upstream of AKT in skeletal muscle insulin signaling.\",\n      \"method\": \"Muscle-specific TRIB3 overexpressing (MOE) and knockout (MKO) mouse models, insulin signaling assays (AKT phosphorylation), glucose tolerance tests, in vivo metabolic phenotyping\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using both muscle-specific KO and OE mice, replicated across diabetic and HFD models\",\n      \"pmids\": [\"27207527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIB3 expression in skeletal muscle is regulated by nutrient availability (decreased under fasting, increased under nutrient excess), indicating a physiological role in metabolic homeostasis beyond pathological insulin resistance.\",\n      \"method\": \"Muscle-specific TRIB3 MOE and MKO mouse models, substrate metabolism assays, energy expenditure measurements\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic models with metabolic phenotyping, single study\",\n      \"pmids\": [\"27207527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Trib3 mRNA expression in bone marrow-derived mast cells (BMMCs) is positively regulated by IL-3; Trib3-deficient BMMCs show delayed recovery after transient IL-3 deprivation, accelerated death during prolonged IL-3 starvation, and impaired IgE-dependent and pharmacologically induced degranulation, as well as reduced activation-induced cytokine mRNA expression.\",\n      \"method\": \"Trib3 knockout mouse-derived BMMCs, IL-3 deprivation assays, degranulation assays, cytokine mRNA measurement\",\n      \"journal\": \"Cellular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model with defined cellular phenotypes, single lab\",\n      \"pmids\": [\"23261831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIB3 expression in cells is regulated at the level of mRNA translation; during anoxia, TRIB3 mRNA translation is profoundly inhibited, producing a discordance between TRIB3 mRNA and protein levels. TRIB3 protein is stable with levels not controlled by rapid protein breakdown.\",\n      \"method\": \"Translational control assays, anoxia treatment, miRNA-24 manipulation, protein stability assays in breast cancer cell lines and patient specimens\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct measurement of translation rates and protein stability, single lab\",\n      \"pmids\": [\"23185332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIB3 suppresses Chac1 (a glutathione-degrading enzyme) expression during arsenite stress; Trib3-deficient cells show markedly elevated CHAC1 expression, accelerated glutathione consumption, and increased susceptibility to arsenite-induced cell death. This suppression is mediated through regulatory elements in the Chac1 promoter and operates within the ATF4 pathway.\",\n      \"method\": \"Trib3 knockout mouse embryonic fibroblasts, Chac1 promoter reporter assays, siRNA knockdown of Chac1, glutathione measurement, cell death assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO plus promoter reporter plus siRNA rescue with biochemical readout (glutathione), multiple orthogonal methods\",\n      \"pmids\": [\"27526673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIB3 induction in PD models is driven by the transcription factor complex CHOP/ATF4; the drug adaptaquin inhibits ATF4-dependent transcription, suppresses Trib3 induction, preserves Parkin levels, and protects dopaminergic neurons in both cellular and 6-OHDA mouse models of PD.\",\n      \"method\": \"Neuronal PC12 cells, ventral midbrain dopaminergic neuron cultures, 6-OHDA mouse model, adaptaquin pharmacological treatment, ATF4/CHOP level measurement, Trib3 and Parkin quantification\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis in cellular and in vivo models, single lab\",\n      \"pmids\": [\"31911115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ATF4 binds to a specific region of the TRIB3 promoter to transcriptionally upregulate TRIB3 in hepatic stellate cells under mitochondrial stress; TRIB3 in turn promotes HSC activation, and AAV8-shRNA-Atf4 alleviates liver fibrosis in rats by reducing TRIB3 expression.\",\n      \"method\": \"ChIP assay (ATF4 binding to TRIB3 promoter), AAV8-shRNA knockdown, CCl4 rat fibrosis model, PDGF-BB in vitro model, western blot\",\n      \"journal\": \"Journal of gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay demonstrating direct ATF4-TRIB3 promoter binding with in vivo genetic intervention, single lab\",\n      \"pmids\": [\"37150773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"OC-derived TGF-β1 activates SMAD3 phosphorylation in adipocytes, which upregulates TRIB3; TRIB3 then suppresses phosphorylation of C/EBPβ, driving adipocyte dedifferentiation into cancer-associated adipocytes that remodel the extracellular matrix to form a pre-metastatic niche for ovarian cancer.\",\n      \"method\": \"Co-immunoprecipitation-based pathway analysis, pharmacological TGF-β1/SMAD3 inhibition, western blot, in vitro co-culture, in vivo metastasis models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway placement by western blot and inhibitor without direct Co-IP for TRIB3-C/EBPβ, single lab\",\n      \"pmids\": [\"39719444\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIB3 is a stress-inducible pseudokinase scaffold that operates at the intersection of multiple signaling pathways by physically recruiting, stabilizing, or destabilizing key regulatory proteins: it suppresses AKT-mediated FOXO1 phosphorylation and degradation; blocks SQSTM1/p62 from binding LC3 to impair autophagic flux; inhibits ATF4 transcriptional activity by colocalizing with it on chromatin at C/EBP-ATF motifs; stabilizes oncoproteins (PML-RARα, MYC, TWIST1, TAZ, EGFR, PLIN2) by suppressing their ubiquitination; promotes NF-κB inhibition by interacting with p65 and blocking PKA-mediated p65 phosphorylation; drives HNF4α and PPARα/γ degradation through E3 ligase complexes (TRIM8, COP1); recruits KAT5 to SMAD3 to sustain SMAD3 acetylation and transcriptional activity; interacts with GSK-3β to stabilize it from degradation; and forms a prodeath axis with Parkin in neurons, placing it as a central stress-responsive scaffold that integrates ER stress, insulin/AKT, Wnt/β-catenin, autophagy, and ubiquitin-proteasome pathways depending on cellular context.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIB3 is a stress-inducible pseudokinase scaffold that integrates ER stress, insulin/AKT, Wnt/\\u03b2-catenin, autophagy, and ubiquitin-proteasome signaling by physically recruiting, stabilizing, or destabilizing regulatory proteins in a context-dependent manner [#0, #19, #25]. Originally identified as an NF-\\u03baB-inducible protein (SINK) that binds the p65 transactivator and blocks its PKA-mediated phosphorylation to suppress NF-\\u03baB transcription while sensitizing cells to TNF/TRAIL apoptosis [#0], TRIB3 negatively regulates the ER-stress transcription factor ATF4, with which it colocalizes on chromatin at C/EBP-ATF motifs [#19]. TRIB3 is itself induced by ATF4/CHOP, establishing recurrent feedback circuits in which the pathways it modulates also drive its expression [#5, #6, #15, #31]. A dominant theme is its control of protein stability: TRIB3 stabilizes oncoproteins by blocking their ubiquitination\\u2014PML-RAR\\u03b1 (also suppressing sumoylation) [#3], MYC (against UBE3B) [#10], TWIST1 [#8], TAZ (against \\u03b2-TrCP) [#11], EGFR (with PKC\\u03b1/WWP1-driven juxtamembrane modification enhancing recycling) [#9], and PLIN2 (against TEB4) [#23]\\u2014while conversely recruiting E3 ligases to destabilize tumor suppressors and metabolic regulators, driving TRIM8-dependent K48 polyubiquitination of HNF4\\u03b1 [#21], COP1-dependent FOXO1 degradation [#24], and degradation of PPAR\\u03b1/PPAR\\u03b3 [#12, #14]. TRIB3 also impairs autophagic flux by binding SQSTM1/p62 and blocking its LC3 interaction, causing p62 accumulation that suppresses degradation of tumor-promoting factors and promotes liver fibrosis [#2, #7]. As a transcriptional adaptor it potentiates Wnt/\\u03b2-catenin-TCF4 [#4, #13, #22], SMAD3 (by recruiting KAT5 to sustain SMAD3 acetylation) [#5], AKT-FOXO1-SOX2 [#6], and STAT3-VEGFA [#17] programs. In metabolic tissue TRIB3 is required for glucose-induced insulin resistance upstream of AKT in skeletal muscle [#25], and a gain-of-function variant (p.Q84R) worsens hepatic steatosis via enhanced HNF4\\u03b1 degradation [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established TRIB3's first molecular role: how an NF-\\u03baB target gene feeds back to restrain NF-\\u03baB signaling, identifying TRIB3 as a transcriptional brake and apoptotic sensitizer.\",\n      \"evidence\": \"Co-IP, in vitro PKA kinase assay, and NF-\\u03baB reporter assays in overexpression systems\",\n      \"pmids\": [\"12736262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which TRIB3 blocks PKA access to p65 not structurally defined\", \"Physiological NF-\\u03baB contexts beyond TNF/TRAIL untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed TRIB3 supports immune cell survival and effector function, broadening its role beyond transcriptional suppression to cytokine-dependent cell fate.\",\n      \"evidence\": \"Trib3-knockout mouse-derived BMMCs assayed for IL-3 deprivation survival, degranulation, and cytokine mRNA\",\n      \"pmids\": [\"23261831\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular partners mediating mast cell survival not identified\", \"Link to IL-3 signaling components undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined two distinct TRIB3 mechanisms\\u2014an autophagy block via SQSTM1/p62 and a prodeath neuronal axis via Parkin\\u2014revealing context-dependent pro-tumor versus pro-death outputs.\",\n      \"evidence\": \"Co-IP, autophagic flux assays with peptide competition, and genetic epistasis in tumor and neuronal models plus postmortem PD tissue\",\n      \"pmids\": [\"26301314\", \"26224857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same scaffold yields opposite cell-fate outcomes across tissues unresolved\", \"Whether Parkin reduction is degradative or transcriptional unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established TRIB3 as a required, nutrient-regulated mediator of glucose toxicity upstream of AKT in skeletal muscle, anchoring its physiological role in metabolic homeostasis.\",\n      \"evidence\": \"Muscle-specific TRIB3 overexpression and knockout mice with insulin signaling and metabolic phenotyping\",\n      \"pmids\": [\"27207527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular target in muscle AKT pathway not pinned down\", \"Relationship to TRIB3-AKT-FOXO1 interaction defined later not integrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed TRIB3 abundance is governed by mRNA translation and protein stability, and that TRIB3 suppresses CHAC1 within the ATF4 pathway to control glutathione and stress survival.\",\n      \"evidence\": \"Translational control and protein stability assays in cancer cells; Trib3-knockout MEFs with Chac1 promoter reporters and glutathione measurement\",\n      \"pmids\": [\"23185332\", \"27526673\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRIB3 acts on the Chac1 promoter mechanistically undefined\", \"Translation control of TRIB3 in non-anoxic contexts untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed TRIB3 as a transcriptional adaptor that enhances Wnt/\\u03b2-catenin-TCF4 and SMAD3 programs through chromatin recruitment and KAT5-mediated acetylation, embedded in self-reinforcing feedback loops.\",\n      \"evidence\": \"Co-IP, ChIP, reporter assays, K333 acetylation mutagenesis in colorectal and melanoma models\",\n      \"pmids\": [\"30365932\", \"29520103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIB3 directly contacts chromatin or bridges factors unclear\", \"Structural basis of KAT5 recruitment to SMAD3 unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified the recurrent oncoprotein-stabilization mechanism: TRIB3 binds substrates and blocks their ubiquitin/sumo-dependent degradation, first shown for PML-RAR\\u03b1.\",\n      \"evidence\": \"Co-IP, ubiquitylation/sumoylation assays, peptide disruption, and APL mouse model\",\n      \"pmids\": [\"28486108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which E3 ligases TRIB3 displaces from PML-RAR\\u03b1 not fully resolved\", \"Generality across substrates not yet established at this point\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Generalized the stabilization paradigm across oncoproteins (TWIST1, MYC-pending, EGFR) and extended autophagy blockade to fibrosis, while linking TRIB3-AKT to FOXO1-SOX2 stemness circuits.\",\n      \"evidence\": \"Co-IP, ubiquitination/phosphorylation assays, site-directed mutagenesis, stapled/helical peptide disruption across leukemia, lung, breast, and liver fibrosis models\",\n      \"pmids\": [\"31235507\", \"32694521\", \"31844113\", \"31286822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIB3 recognizes a shared degron motif across substrates unknown\", \"How one scaffold both blocks and recruits E3 ligases mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Expanded the dual stabilize/destabilize logic\\u2014stabilizing MYC and TAZ while promoting PPAR\\u03b1/\\u03b3 degradation\\u2014and confirmed feedback control via CHOP/ATF4-driven TRIB3 induction in PD.\",\n      \"evidence\": \"Co-IP, ubiquitination and reporter assays, pharmacological ATF4 inhibition (adaptaquin) across lymphoma, esophageal, leukemia, lung, and PD models\",\n      \"pmids\": [\"33298911\", \"32157210\", \"32929351\", \"32621919\", \"31562867\", \"31911115\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants selecting stabilization versus degradation for a given partner unknown\", \"Most substrate findings from single labs without reciprocal cross-validation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided genome-wide evidence that TRIB3 colocalizes with ATF4 on chromatin to restrain its transcription, and showed TRIB3 is itself stabilized by P300 acetylation while suppressing antitumor immunity via EGFR/STAT1/CXCL10.\",\n      \"evidence\": \"Endogenous Flag-tagged TRIB3 ChIP-Seq, transcriptomics, P300 acetylation/degradation assays, and CRC mouse models\",\n      \"pmids\": [\"34066165\", \"34985967\", \"36245025\", \"36142452\", \"36555349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIB3 binds DNA directly or via ATF4 unresolved\", \"Mechanism of MLL complex interference at PPARG locus not structurally defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reconstituted TRIB3 as an E3-ligase adaptor driving substrate degradation, defining TRIM8-mediated K48 ubiquitination of HNF4\\u03b1 at K470 and a disease-causing gain-of-function variant, alongside COP1-FOXO1 and TEB4-PLIN2 axes.\",\n      \"evidence\": \"Co-IP, mass spectrometry, in vivo/in vitro ubiquitination, K470 mutagenesis, peptide disruption, and mouse NAFLD/HCC/RCC models\",\n      \"pmids\": [\"38237865\", \"38561354\", \"38429254\", \"40211872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRIB3 chooses to recruit versus exclude specific E3 ligases unknown\", \"Structural basis of the TRIB3-TRIM8-HNF4\\u03b1 complex not solved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown what structural feature of the TRIB3 pseudokinase scaffold dictates whether a given partner is stabilized or targeted for degradation, and whether a unifying recognition motif governs substrate selection across its many contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of TRIB3 bound to any partner reported in the corpus\", \"No common degron or binding motif identified across substrates\", \"Tissue-specific determinants of opposing outputs uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5, 21, 24]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [21, 24, 3, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 19]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [4, 19, 5]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [19, 4, 14]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [19, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 10, 21, 24, 23]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 6, 25]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 19, 4, 5]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [19, 29, 30]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [25, 21, 23, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [21, 25, 1]}\n    ],\n    \"complexes\": [\n      \"TRIB3-TRIM8-HNF4\\u03b1 ubiquitination complex\",\n      \"TRIB3-\\u03b2-catenin-TCF4 complex\"\n    ],\n    \"partners\": [\n      \"RELA\",\n      \"SQSTM1\",\n      \"ATF4\",\n      \"CTNNB1\",\n      \"SMAD3\",\n      \"MYC\",\n      \"EGFR\",\n      \"HNF4A\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}