{"gene":"NUPR1","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2000,"finding":"Human NUPR1 (p8) has properties of HMG-I/Y proteins, is monomeric and partially unfolded in solution, binds DNA weakly, and is a substrate for protein kinase A (PKA); phosphorylation by PKA increases secondary structure content and dramatically enhances DNA binding.","method":"Circular dichroism, FTIR, NMR spectroscopy, electrophoretic gel shift assay, in vitro PKA phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biophysical methods in vitro with functional DNA-binding readout","pmids":["11056169"],"is_preprint":false},{"year":2006,"finding":"NUPR1 (p8) forms a complex with the antiapoptotic protein prothymosin alpha (ProTalpha); the interaction induces conformational changes in both proteins and both must be co-expressed for the antiapoptotic response to staurosporine in HeLa cells.","method":"Yeast two-hybrid, fluorescence spectroscopy, circular dichroism, NMR spectroscopy, siRNA knockdown/overexpression, caspase 3/7 and 9 activity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (NMR, fluorescence, functional siRNA) in one study","pmids":["16478804"],"is_preprint":false},{"year":2008,"finding":"NUPR1 forms a complex with p53 and p300, binds the p21 promoter, and transcriptionally upregulates p21 expression; it also promotes phosphorylation of Rb and upregulation of Bcl-xL, conferring resistance to doxorubicin and Taxol.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), luciferase reporter assay, siRNA knockdown, Western blot","journal":"Current cancer drug targets","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and ChIP with functional chemoresistance readout, single lab","pmids":["18690848"],"is_preprint":false},{"year":2002,"finding":"p8-deficient mouse embryonic fibroblasts grow more rapidly due to elevated Cdk2/Cdk4 activity and decreased p27 levels, and are more resistant to adriamycin-induced apoptosis; p8 overexpression increases p53 protein level and trans-activation capacity, and p53 negatively trans-activates p8, forming an autoregulatory loop.","method":"p8-/- mouse embryonic fibroblasts, kinase activity assay, Western blot, reporter assay, apoptosis assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple molecular readouts (Cdk activity, p27, p53), strong mechanistic follow-up","pmids":["11896600"],"is_preprint":false},{"year":2006,"finding":"p8 is required for endothelin- and alpha-adrenergic agonist-induced cardiomyocyte hypertrophy and for TNF-stimulated induction of MMP9 and MMP13 in cardiac fibroblasts; p8 associates with chromatin at c-Jun-containing sites on the ANF, MMP9 and MMP13 promoters in a stimulus-dependent manner.","method":"Chromatin immunoprecipitation (ChIP), RNAi knockdown, gene expression analysis, primary cardiomyocyte and fibroblast assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — ChIP demonstrating direct promoter binding plus RNAi with defined hypertrophic and MMP phenotype","pmids":["17116693"],"is_preprint":false},{"year":2005,"finding":"p8 interacts with Jab1; this interaction is required for Jab1-induced translocation of p27 from nucleus to cytoplasm and its subsequent degradation; knockdown of p8 strongly inhibits Jab1 activity.","method":"Yeast two-hybrid, His6-pulldown, co-immunoprecipitation, co-localization, siRNA knockdown, p27 localization assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal pulldown/Co-IP with functional p27 degradation readout, supported by knockdown","pmids":["16300740"],"is_preprint":false},{"year":2009,"finding":"p8 (NUPR1) acts as a corepressor of FoxO3 transcription factor; p8 knockdown increases FoxO3 nuclear localization, increases FoxO3 association with the Bnip3 promoter, and elevates Bnip3 levels, leading to increased autophagy and apoptosis. p8-/- mice show elevated cardiac autophagy, higher Bnip3, and impaired cardiac function.","method":"RNAi in cardiomyocytes/H9C2/U2OS cells, FoxO3 transcriptional activity assay, ChIP, p8-/- mouse cardiac phenotyping, pharmacological autophagy inhibitors, Atg5 siRNA","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — ChIP, in vitro functional assays, and in vivo KO mouse all supporting same mechanism","pmids":["20181828"],"is_preprint":false},{"year":2009,"finding":"p8 (NUPR1) binds to histone acetyltransferase p300 and co-occupies the myogenin promoter together with p300, MyoD, and p68 (Ddx5); p8 knockdown compromises chromatin association of all four proteins, impairs p300-dependent events (Myc expression, histone acetylation, MyoD acetylation) and severely impairs myogenic differentiation.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, differentiation assays in C2C12 myoblasts","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, and functional differentiation assay all in agreement","pmids":["19723804"],"is_preprint":false},{"year":2006,"finding":"Com-1 (NUPR1) interacts with estrogen receptor-beta (ER-beta) in breast cancer cells as shown by co-immunoprecipitation; ER-beta and Com-1 share identical nuclear localization; 17-beta-estradiol stimulation reduces nuclear Com-1 staining in a ubiquitin-proteasome pathway-dependent manner.","method":"Co-immunoprecipitation, immunocytochemistry, ribozyme transgene knockdown, ubiquitin/proteasome inhibitor treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP with supporting localization and proteasome inhibitor data, single lab","pmids":["15781258"],"is_preprint":false},{"year":2006,"finding":"p8 (NUPR1) shows cell growth-dependent subcellular localization: nuclear in actively dividing sub-confluent cells, nucleo-cytoplasmic in G0/G1-arrested cells. A conserved bipartite NLS (including Lys65, 69, 76, 77) is required for nuclear import. Nuclear localization is energy-dependent and is regulated by acetylation (trichostatin A causes cytoplasmic accumulation). Nuclear export does not involve CRM1.","method":"Immunocytochemistry, GFP-fusion protein localization, NLS mutagenesis, pharmacological inhibitors (sodium azide/2-DG, leptomycin B, trichostatin A), live-cell imaging","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 2 — direct mutagenesis of NLS combined with pharmacological dissection, multiple conditions tested","pmids":["16294328"],"is_preprint":false},{"year":2017,"finding":"NUPR1 binds to the C-terminal region of Polycomb protein RING1B with ~10 µM affinity; the binding region on NUPR1 is a hydrophobic patch at the '30s region' (around Ala33); Ala33Gln and Thr68Gln mutations reduce this binding. The interaction is inhibited by trifluoperazine. Interaction was confirmed in cellulo by protein ligation assay.","method":"NMR, site-directed mutagenesis, isothermal titration calorimetry, molecular docking, protein ligation assay in cellulo","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — NMR mapping + mutagenesis + in cellulo validation, multiple orthogonal approaches","pmids":["28720707"],"is_preprint":false},{"year":2019,"finding":"ZZW-115 (a trifluoperazine-derived compound) binds NUPR1 through the region around Thr68, which is located in the NLS region; ZZW-115 inhibits nuclear translocation of NUPR1 by competing with importins, induces tumor regression in xenografted mice, and causes cell death primarily by necroptosis.","method":"Biophysical binding assays (ITC, fluorescence), molecular modeling, cell viability assays, mouse xenograft model, nuclear translocation assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding + mechanistic nuclear translocation assay + in vivo tumor regression, multiple methods","pmids":["30920390"],"is_preprint":false},{"year":2019,"finding":"NUPR1 binds to several importin proteins (establishing its nuclear translocation mechanism); ZZW-115 competes with importins for binding to the NLS region of NUPR1, inhibiting nuclear translocation; NUPR1 directly stimulates the SUMOylation machinery in a cell-free system, and ZZW-115 reduces SUMOylation of DDR proteins, sensitizing cancer cells to genotoxic agents.","method":"Interactome/mass spectrometry proteomics, nuclear translocation assay, cell-free SUMOylation assay with recombinant NUPR1, co-immunoprecipitation, genotoxicity assays","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1–2 — cell-free reconstitution of SUMOylation + MS interactome + functional genotoxic sensitization","pmids":["32780723"],"is_preprint":false},{"year":2020,"finding":"Phosphorylation of Thr68 in the NLS of NUPR1 hampers its binding to importin α3 (Impα3); the phosphorylated peptide adopts a turn-like conformation (confirmed by 2D NMR NOE), while the unphosphorylated peptide is random coil; removal of Lys65 or Lys69 also reduces binding, indicating importance of positive charges.","method":"NMR spectroscopy (2D 1H-NMR, NOE), isothermal titration calorimetry, molecular docking, fluorescence spectroscopy, peptide phospho-mimetic mutagenesis","journal":"Biomolecules","confidence":"High","confidence_rationale":"Tier 1 — NMR structural evidence + ITC binding quantification + mutagenesis, multiple orthogonal methods","pmids":["32933064"],"is_preprint":false},{"year":2021,"finding":"NUPR1 drives ferroptosis resistance by transcriptionally activating LCN2 expression, which reduces intracellular iron accumulation and subsequent oxidative damage; LCN2 depletion mimics NUPR1 deficiency for ferroptosis induction, and re-expression of LCN2 restores resistance in NUPR1-deficient cells.","method":"NanoString technology, shRNA knockdown, LCN2 overexpression rescue, pancreas-specific Lcn2 conditional knockout mice, erastin treatment, pancreatitis mouse models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis (KO + rescue) with multiple models (cell lines, KO mice), replicated across approaches","pmids":["33510144"],"is_preprint":false},{"year":2022,"finding":"NUPR1 binds PARP1 in the nucleus and inhibits PARP1 activity in vitro; NUPR1 inactivation (by ZZW-115 or genetic knockout) leads to hyperPARylation, mitochondrial catastrophe (membrane potential loss, superoxide production, ROS increase, Ca2+ elevation), and cell death through a non-canonical Parthanatos (AIF does not translocate from mitochondria); this cell death is rescued by the PARP inhibitor olaparib or NAD+ precursor NMN.","method":"Co-immunoprecipitation (NUPR1–PARP1), in vitro PARP1 activity assay with recombinant NUPR1, NUPR1 mutants (Ala33, Thr68), ZZW-115 treatment, NAD+/NADH measurement, mitochondrial membrane potential, superoxide/ROS assays, olaparib/PARG inhibitor rescue","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution of PARP1 inhibition by recombinant NUPR1 + mutagenesis + multiple cellular rescue experiments","pmids":["35869257"],"is_preprint":false},{"year":2018,"finding":"Inactivation of NUPR1 in pancreatic cancer cells causes mitochondrial failure (loss of membrane potential, ROS increase, decreased OXPHOS/ATP), relocation of mitochondria near ER, and ER-stress-coupled necrotic cell death that is reversed by necrostatin-1 (necroptosis inhibitor) but not by Z-VAD-FMK (caspase inhibitor). NUPR1 expression protects acinar cells from necrosis in vivo.","method":"NUPR1 shRNA/siRNA knockdown, transcriptomic analysis, mitochondrial membrane potential assay, ROS assay, ATP measurement, necrostatin-1/Z-VAD-FMK rescue, thapsigargin/brefeldin A/tunicamycin ER stress induction, acute pancreatitis mouse model","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — multiple pharmacological rescue experiments plus in vivo model supporting mechanistic model","pmids":["30451898"],"is_preprint":false},{"year":2015,"finding":"Nupr1 acts as a gene modifier of Kras(G12D)-induced senescence by regulating Dnmt1 expression and genome-wide DNA methylation levels; Nupr1 deficiency in Kras(G12D) mice increases β-galactosidase-positive (senescent) cells and activates the FoxO3a-Skp2-p27Kip1-pRb-E2F senescence pathway in vivo and in vitro.","method":"Nupr1-/- × Kras(G12D) mouse genetics, β-galactosidase staining, DNA methylation analysis, RNAi in human pancreatic cancer cells, Dnmt1 expression analysis, FoxO3a/Skp2/p27 pathway analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo (mouse model) corroborated by RNAi in human cell lines with defined pathway","pmids":["26617245"],"is_preprint":false},{"year":2014,"finding":"Nupr1 cooperates with oncogenic Kras(G12D) to bypass senescence and promote PanIN formation; genetic inactivation of Nupr1 impairs Kras-induced PanIN in mice, increasing senescent (β-galactosidase-positive) cells and activating the FoxO3a-Skp2-p27Kip1-pRb-E2F pathway.","method":"Pdx1-cre;LSL-KrasG12D;Nupr1-/- mouse model, β-galactosidase staining, gene expression profiling, RNAi in pancreatic cancer cells, pathway analysis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic epistasis with molecular pathway characterization","pmids":["24902898"],"is_preprint":false},{"year":2012,"finding":"NUPR1 confers chemoresistance in p53-deficient inflammatory breast cancer cells by causing Akt-mediated phosphorylation of p21 and its cytoplasmic re-localization, as well as activation of anti-apoptotic Bcl-xL; this defines a NUPR1-PI3K/Akt-phospho-p21 axis.","method":"NUPR1 overexpression/knockdown, Akt inhibitor treatment, Western blot for phospho-p21 and cytoplasmic/nuclear fractionation, Bcl-xL measurement, chemoresistance assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — functional assay with pathway inhibitors, single lab, no direct reconstitution","pmids":["22858377"],"is_preprint":false},{"year":2002,"finding":"p8 expression is required for tumor formation: transformed p8-/- MEFs cannot form colonies in soft agar or tumors in nude mice, while restoration of p8 expression in p8-/- MEFs restores tumor-forming ability.","method":"p8-/- MEF transformation with rasV12/E1A, soft agar colony assay, subcutaneous and intraperitoneal tumor formation in nude mice, p8 rescue by re-expression","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO + rescue experiment with defined tumor formation phenotype","pmids":["11818333"],"is_preprint":false},{"year":2015,"finding":"NUPR1 knockdown suppresses liver cancer cell invasion in a Ca2+-signaling-dependent manner; granulin was identified as a key downstream transcriptional effector of NUPR1 via promoter binding assay; the NUPR1-granulin pathway is associated with mitochondrial defect-derived glycolytic activation.","method":"NUPR1 knockdown, invasion assay with Ca2+ signaling inhibitors, promoter binding (ChIP-like) assay, gene expression profiling","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 3 — promoter binding assay + functional invasion assay with Ca2+ inhibitors, single lab","pmids":["26173068"],"is_preprint":false},{"year":2022,"finding":"NUPR1 interacts with aryl hydrocarbon receptor (AhR) and promotes AhR degradation via the autophagy-lysosome pathway and decreased nuclear AhR translocation, thereby reducing CYP enzyme transcription, lowering ROS generation after ionizing radiation, and conferring radioresistance in hepatocellular carcinoma.","method":"Co-immunoprecipitation (NUPR1-AhR), RNA sequencing, ROS/lipid peroxidation assays, colony formation assay, xenograft tumor model, AhR activator rescue","journal":"BMC medicine","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP for interaction + functional rescue experiments, single lab","pmids":["36258210"],"is_preprint":false},{"year":2022,"finding":"NUPR1 promotes cancer cell proliferation and metastasis by directly increasing TFE3 transcriptional activity, which maintains autophagic flux and lysosomal function; NUPR1 knockdown suppresses TFE3-dependent autophagy.","method":"NUPR1 stable knockdown, label-free quantitative proteomics, tandem mass tag proteomics, TFE3 activity assay, autophagy flux assay, in vitro and in vivo tumor models","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 3 — proteomics + functional assays supporting NUPR1→TFE3→autophagy axis, single lab","pmids":["35462576"],"is_preprint":false},{"year":2016,"finding":"NUPR1 silencing in HCC cells influences expression of RELB and IER3 genes; NUPR1 regulates RUNX2 expression; these together define a NUPR1/RELB/IER3/RUNX2 pathway regulating NF-κB and ERK signaling in HCC.","method":"Stable NUPR1 knockdown, gene expression profiling, network analysis, RUNX2/RELB/IER3 siRNA, cell viability/migration assays, sorafenib sensitivity assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 — gene expression profiling + functional knockdowns defining a regulatory pathway, single lab","pmids":["27336713"],"is_preprint":false},{"year":2016,"finding":"NUPR1 is downregulated in highly malignant tumor-repopulating cells (TRCs) grown in soft fibrin matrices; this downregulation is mediated by YAP nuclear translocation (controlled by Cdc42-mediated F-actin and Lats1); Nupr1 negatively regulates Nestin and Tert expression and suppresses TRC growth.","method":"Soft fibrin matrix TRC culture, YAP ChIP at Nupr1 promoter, Nupr1 siRNA/overexpression, Cdc42/Lats1 pathway inhibition, in vivo tumor formation in immune-competent mice","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 3 — ChIP at Nupr1 promoter + functional knockdown/OE with mechanistic upstream pathway","pmids":["27089143"],"is_preprint":false},{"year":2011,"finding":"Amino acid starvation induces p8 expression via the GCN2/ATF4 pathway; an Amino Acid Response Element (AARE) in the p8 promoter mediates this regulation; evidence provided in vitro and in vivo.","method":"p8 promoter AARE mutagenesis, reporter assay, ATF4 knockdown, GCN2-/- mouse studies, amino acid deprivation experiments","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — promoter mutagenesis + genetic KO validation in vivo, moderate evidence for upstream pathway","pmids":["21867687"],"is_preprint":false},{"year":2017,"finding":"Nupr1 mediates METH-induced neuronal apoptosis and autophagy through the CHOP-Trib3 endoplasmic reticulum stress signaling pathway; silencing Nupr1 reduces METH-induced apoptosis and autophagy both in vitro (neurons, PC12 cells) and in vivo (rat striatum via lentivirus-mediated shRNA).","method":"shRNA/siRNA knockdown of Nupr1, CHOP, Trib3 in primary neurons and PC12 cells; lentiviral striatum injection in rats; Western blot for ER stress, apoptosis, autophagy markers","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis by sequential knockdown in vitro + in vivo lentiviral knockdown with defined pathway","pmids":["28694771"],"is_preprint":false},{"year":2021,"finding":"Nupr1 mediates TGF-β-induced myofibroblast activation and EMT via the Smad3 signaling pathway; Nupr1-/- mice are protected from UUO-induced renal fibrosis; the NUPR1 inhibitor trifluoperazine (TFP) alleviates renal fibrosis in vivo.","method":"Nupr1-/- mouse UUO model, TGF-β treatment of fibroblasts/epithelial cells, α-SMA/collagen expression, Smad3 phosphorylation analysis, TFP pharmacological inhibition","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined fibrosis phenotype + mechanistic Smad3 pathway + pharmacological rescue","pmids":["33617091"],"is_preprint":false},{"year":2022,"finding":"Nupr1 regulates HSC quiescence by inhibiting p53 expression; Nupr1 deletion activates quiescent HSCs and confers competitive engraftment advantage; restoration of p53 in Nupr1-/- HSCs offsets the engraftment advantage.","method":"Nupr1-/- mouse model, competitive transplantation assay, serial transplantation, p53 rescue experiment, in vitro expansion protocol","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO + p53 rescue epistasis, clean phenotype but single lab","pmids":["33299232"],"is_preprint":false},{"year":2013,"finding":"Nupr1 suppresses β-cell proliferation by inhibiting Ccna2 and Tcf19 promoter activities; Nupr1-/- mice have increased β-cell mass due to enhanced islet cell proliferation and are protected from HFD-induced glucose intolerance.","method":"Nupr1-/- mouse model, BrdU incorporation (β-cell proliferation), luciferase reporter for Ccna2 and Tcf19 promoters, gene arrays, HFD challenge","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 — genetic KO + promoter reporter assays defining molecular mechanism, in vivo and in vitro concordant","pmids":["23900510"],"is_preprint":false},{"year":2025,"finding":"Tumor-derived lactate upregulates NUPR1 expression in tumor-associated macrophages via histone lactylation; NUPR1 then inhibits ERK and JNK signaling, promotes M2 macrophage polarization and PD-L1/SIRPA expression, leading to CD8+ T cell exhaustion and immune suppression.","method":"scRNA-seq analysis, functional in vitro and in vivo assays, histone lactylation assay, ERK/JNK pathway analysis, pharmacological NUPR1 inhibition, PD-1 blockade combination experiments","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 3 — mechanistic pathway with histone lactylation assay and functional rescue, single study","pmids":["40305758"],"is_preprint":false},{"year":2023,"finding":"WTAP promotes NUPR1 expression via m6A modification in an eIF3A-mediated manner (m6A-EIF3A mechanism), which stabilizes NUPR1 mRNA; NUPR1 in turn positively regulates LCN2 transcription to suppress ferroptosis in triple-negative breast cancer cells.","method":"m6A dot blot assay, RNA immunoprecipitation (RIP), RNA degradation assay, WTAP/NUPR1/LCN2 siRNA, iron/GSH measurements","journal":"Biochemical genetics","confidence":"Medium","confidence_rationale":"Tier 3 — m6A assay + RIP + functional ferroptosis readout, single lab","pmids":["37477758"],"is_preprint":false},{"year":2024,"finding":"NUPR1 promotes FTH1 transcription in HCC cells, enhancing iron storage and conferring resistance to ferroptosis; this is driven upstream by circPIAS1 sponging miR-455-3p to increase NUPR1 levels. ChIP confirmed NUPR1 binding to the FTH1 promoter.","method":"RNA immunoprecipitation, luciferase reporter, RNA pulldown, FISH, ChIP (NUPR1 at FTH1 promoter), NUPR1 knockdown/overexpression, ZZW-115 treatment, xenograft mouse model","journal":"Molecular cancer","confidence":"High","confidence_rationale":"Tier 2 — ChIP showing direct NUPR1-FTH1 promoter binding + genetic epistasis (rescue) + multiple orthogonal methods","pmids":["38802795"],"is_preprint":false}],"current_model":"NUPR1 is a small, intrinsically disordered, chromatin-associated transcriptional regulator that, in response to cellular stress, translocates to the nucleus via a bipartite NLS (phosphorylation of Thr68 by PKA promotes DNA binding, while phosphorylation also hampers importin binding) where it binds partners including p53/p300 (to transactivate p21), Polycomb RING1B, PARP1 (inhibiting hyperPARylation and thereby protecting mitochondrial integrity), FoxO3 (corepressor), and chromatin at AP-1-regulated promoters; its key downstream effectors include LCN2 (blocking iron accumulation and ferroptosis), FTH1 (iron storage), Dnmt1 (DNA methylation to bypass Kras-induced senescence), Bnip3 (autophagy regulation), MMP9/13 and ANF (cardiac remodeling), and TFE3 (autophagy flux); NUPR1-deficient cells die by necroptosis or hyperPARylation-dependent mitochondrial catastrophe, establishing NUPR1 as a master stress-survival protein whose pharmacological inhibition (e.g., by ZZW-115 blocking importin-NLS interaction) suppresses tumor growth across multiple cancer types."},"narrative":{"teleology":[{"year":2000,"claim":"Establishing that NUPR1 is an intrinsically disordered protein with HMG-like properties whose DNA-binding activity is dramatically activated by PKA phosphorylation resolved how a small, largely unstructured protein could function at chromatin.","evidence":"CD, FTIR, NMR, and gel-shift assays with recombinant human NUPR1 ± PKA treatment","pmids":["11056169"],"confidence":"High","gaps":["Identity of the PKA-targeted residue(s) was not fully mapped at this stage","In vivo relevance of PKA-dependent activation was not tested","Genomic binding sites were unknown"]},{"year":2002,"claim":"Demonstrating that p8-null MEFs grow faster (elevated Cdk2/Cdk4, decreased p27), resist apoptosis, and fail to form tumors when transformed established NUPR1 as both a growth suppressor and an essential enabler of tumorigenesis.","evidence":"p8−/− MEFs with kinase assays, apoptosis readouts, soft-agar and nude-mouse tumor assays with p8 re-expression rescue","pmids":["11896600","11818333"],"confidence":"High","gaps":["Mechanism by which NUPR1 loss blocks transformation despite accelerating proliferation was unexplained","Downstream transcriptional targets were unidentified"]},{"year":2005,"claim":"Identification of the bipartite NLS and demonstration that nuclear localization is energy-dependent and acetylation-sensitive explained how NUPR1 subcellular distribution is dynamically regulated with the cell cycle.","evidence":"GFP-fusion NLS mutagenesis, pharmacological inhibitors (azide/2-DG, trichostatin A, leptomycin B) in multiple cell lines","pmids":["16294328"],"confidence":"High","gaps":["The acetyltransferase responsible was not identified","Export mechanism remained undefined (CRM1-independent)"]},{"year":2005,"claim":"Showing that NUPR1 interacts with Jab1 and is required for Jab1-mediated nuclear-to-cytoplasmic translocation and degradation of p27 provided a direct mechanism linking NUPR1 to cell-cycle control.","evidence":"Yeast two-hybrid, Co-IP, His6-pulldown, p27 localization upon siRNA knockdown","pmids":["16300740"],"confidence":"High","gaps":["Whether NUPR1 acts stoichiometrically or catalytically in Jab1 function was unknown","Relevance beyond overexpression system not shown"]},{"year":2006,"claim":"Discovery of the NUPR1–prothymosin-α complex and its requirement for anti-apoptotic signaling revealed that NUPR1 exerts survival functions through protein–protein interactions beyond chromatin, and that mutual conformational changes accompany binding of two IDPs.","evidence":"NMR, fluorescence, CD for structural changes; siRNA and caspase activity assays for function in HeLa cells","pmids":["16478804"],"confidence":"High","gaps":["Structural details of the complex were limited by disorder","Downstream effectors of the anti-apoptotic pathway were not defined"]},{"year":2006,"claim":"ChIP evidence that NUPR1 associates with c-Jun-containing AP-1 sites on the ANF, MMP9, and MMP13 promoters in stimulus-dependent fashion, combined with RNAi phenotypes, established NUPR1 as a chromatin cofactor for cardiac hypertrophic and fibroblast remodeling programs.","evidence":"ChIP and RNAi in primary cardiomyocytes and cardiac fibroblasts treated with endothelin/α-adrenergic agonist/TNF","pmids":["17116693"],"confidence":"High","gaps":["Whether NUPR1 is recruited by c-Jun directly or through intermediary factors was not resolved","In vivo cardiac remodeling phenotype of Nupr1 KO was not yet reported"]},{"year":2008,"claim":"Demonstration that NUPR1 complexes with p53 and p300 on the p21 promoter, upregulates Bcl-xL and phospho-Rb, and confers chemoresistance linked NUPR1's transcriptional cofactor role to a defined drug-resistance mechanism.","evidence":"Co-IP, ChIP at p21 promoter, luciferase reporter, siRNA knockdown with doxorubicin/Taxol sensitivity assays","pmids":["18690848"],"confidence":"Medium","gaps":["Whether NUPR1 binds p53 directly or via p300 was unresolved","Single-lab study without independent replication"]},{"year":2009,"claim":"Identification of NUPR1 as a FoxO3 corepressor that limits Bnip3 transcription and autophagy, validated by p8−/− mouse cardiac phenotype (elevated autophagy, impaired function), established NUPR1 as a negative regulator of stress-induced autophagy.","evidence":"ChIP for FoxO3 at Bnip3 promoter ± p8, RNAi/Atg5 siRNA epistasis, p8−/− mouse cardiac phenotyping","pmids":["20181828"],"confidence":"High","gaps":["Direct vs. indirect nature of NUPR1–FoxO3 interaction not biochemically resolved","Autophagy regulation in non-cardiac tissues not examined"]},{"year":2009,"claim":"Showing that NUPR1 binds p300, co-occupies the myogenin promoter with MyoD/p68, and is required for chromatin remodeling and myogenic differentiation broadened NUPR1's cofactor role to a developmental differentiation context.","evidence":"Co-IP, ChIP at myogenin promoter, siRNA in C2C12 myoblasts with differentiation readout","pmids":["19723804"],"confidence":"High","gaps":["Whether NUPR1 is a general p300-scaffold or promoter-selective was unknown","Relevance in vivo during muscle development not tested"]},{"year":2014,"claim":"Genetic demonstration that Nupr1 cooperates with Kras(G12D) to bypass senescence and drive PanIN formation, via the FoxO3a–Skp2–p27–pRb–E2F axis, positioned NUPR1 as a critical node in pancreatic cancer initiation.","evidence":"Pdx1-Cre;LSL-KrasG12D;Nupr1−/− mouse model with β-galactosidase staining and pathway analysis","pmids":["24902898"],"confidence":"High","gaps":["Mechanism of NUPR1 action on Skp2 was indirect","Human pancreatic cancer genetics for NUPR1 not established"]},{"year":2015,"claim":"Identification of Dnmt1 as a NUPR1-regulated target that mediates genome-wide DNA methylation changes to bypass Kras-induced senescence provided an epigenetic mechanism for NUPR1's oncogenic cooperation.","evidence":"Nupr1−/− × KrasG12D mice, DNA methylation analysis, Dnmt1 expression and RNAi in human pancreatic cancer cells","pmids":["26617245"],"confidence":"High","gaps":["Whether NUPR1 directly binds the Dnmt1 promoter was not shown by ChIP","Causal ordering of methylation changes vs. senescence not fully resolved"]},{"year":2017,"claim":"NMR mapping of the NUPR1–RING1B interaction to the hydrophobic '30s region' (Ala33) with ~10 µM affinity, and its inhibition by trifluoperazine, linked NUPR1 to Polycomb-mediated chromatin regulation and opened a pharmacological strategy.","evidence":"NMR chemical shift perturbation, ITC, site-directed mutagenesis (Ala33Gln, Thr68Gln), protein ligation assay in cellulo","pmids":["28720707"],"confidence":"High","gaps":["Functional consequence of NUPR1–RING1B interaction on gene silencing not demonstrated","Whether this interaction occurs on chromatin was unknown"]},{"year":2018,"claim":"Demonstration that NUPR1 inactivation causes mitochondrial failure, ER stress, and necroptotic cell death (rescued by necrostatin-1 but not caspase inhibitors) established the mechanistic basis for NUPR1's pro-survival role and the lethal consequence of its loss.","evidence":"shRNA/siRNA knockdown, mitochondrial membrane potential/ROS/ATP assays, necrostatin-1 and Z-VAD-FMK rescue, pancreatitis mouse model","pmids":["30451898"],"confidence":"High","gaps":["Identity of the necroptotic executors downstream of mitochondrial failure was not defined","Whether ER stress is cause or consequence of mitochondrial failure was unclear"]},{"year":2019,"claim":"Development of ZZW-115, which binds NUPR1 near Thr68 and blocks importin-mediated nuclear translocation, causing tumor regression in vivo, validated NUPR1's nuclear function as druggable and established a pharmacological tool compound.","evidence":"ITC/fluorescence binding, nuclear translocation assay, xenograft regression, necroptosis characterization","pmids":["30920390"],"confidence":"High","gaps":["Off-target effects of ZZW-115 not comprehensively profiled","Pharmacokinetic and toxicity profile limited"]},{"year":2020,"claim":"Structural demonstration that Thr68 phosphorylation induces a turn conformation in the NLS peptide and reduces importin α3 binding resolved the apparent paradox that PKA phosphorylation enhances DNA binding but may limit nuclear entry, revealing a regulatory switch.","evidence":"2D ¹H-NMR NOE, ITC with importin α3, phospho-mimetic peptides","pmids":["32933064"],"confidence":"High","gaps":["In vivo phosphorylation dynamics during stress were not measured","Whether this phospho-switch operates under all stress conditions was untested"]},{"year":2020,"claim":"Proteomic identification of importin partners and demonstration that NUPR1 directly stimulates SUMOylation in a cell-free system linked NUPR1 to the DNA damage response and explained how ZZW-115 sensitizes cells to genotoxic agents.","evidence":"MS interactome, cell-free SUMOylation reconstitution with recombinant NUPR1, genotoxicity assays","pmids":["32780723"],"confidence":"High","gaps":["SUMOylation substrates specifically dependent on NUPR1 were not fully catalogued","Mechanism by which NUPR1 stimulates the SUMO machinery unknown"]},{"year":2021,"claim":"Establishing the NUPR1→LCN2 transcriptional axis as the primary mechanism of ferroptosis resistance, validated by genetic epistasis and conditional KO mice, unified NUPR1's survival role with iron metabolism.","evidence":"shRNA + LCN2 rescue, pancreas-specific Lcn2 conditional KO mice, erastin treatment, pancreatitis models","pmids":["33510144"],"confidence":"High","gaps":["Whether NUPR1 directly binds the LCN2 promoter via ChIP was not shown in this study","LCN2-independent ferroptosis regulation by NUPR1 not excluded"]},{"year":2021,"claim":"Showing that Nupr1 mediates TGF-β/Smad3-driven myofibroblast activation and that Nupr1-null mice are protected from renal fibrosis extended NUPR1's pathological relevance to fibrotic disease.","evidence":"Nupr1−/− UUO mouse model, Smad3 phosphorylation analysis, trifluoperazine pharmacological rescue","pmids":["33617091"],"confidence":"High","gaps":["Whether NUPR1 is a direct Smad3 transcriptional target or responds indirectly was not resolved","NUPR1 interaction with Smad3 at the protein level not demonstrated"]},{"year":2022,"claim":"In vitro reconstitution showing NUPR1 directly binds and inhibits PARP1, and that NUPR1 loss triggers hyperPARylation-dependent mitochondrial catastrophe (rescued by olaparib), identified a fundamentally new molecular activity for NUPR1 as a PARP1 inhibitor.","evidence":"Co-IP, in vitro PARP1 activity assay with recombinant NUPR1 and Ala33/Thr68 mutants, NAD+/NADH measurements, olaparib/NMN rescue","pmids":["35869257"],"confidence":"High","gaps":["Structural basis of PARP1 inhibition not determined","Whether NUPR1 inhibits other PARP family members was untested","Relative contribution of PARP1 inhibition vs. transcriptional programs to survival unclear"]},{"year":2024,"claim":"ChIP-validated direct binding of NUPR1 to the FTH1 promoter, promoting iron storage and ferroptosis resistance, established a second iron-metabolism arm (alongside LCN2) of the NUPR1 anti-ferroptosis program.","evidence":"ChIP at FTH1 promoter, NUPR1 knockdown/overexpression, ZZW-115, xenograft model, circPIAS1/miR-455-3p epistasis","pmids":["38802795"],"confidence":"High","gaps":["Whether NUPR1 coordinately regulates LCN2 and FTH1 or these are context-dependent was not addressed","Iron-independent functions of FTH1 induction not examined"]},{"year":null,"claim":"Key unresolved questions include the structural basis of NUPR1's interaction with PARP1 and the SUMO machinery, the relative contributions of its transcriptional vs. enzymatic-inhibitory functions to cell survival, whether NUPR1 acts as a general chromatin scaffold or is promoter-selective, and its precise mechanism of nuclear export.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of any NUPR1 complex exists","Genome-wide ChIP-seq for NUPR1 chromatin occupancy has not been reported","In vivo phosphorylation stoichiometry at Thr68 under stress is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,4,7,33]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,6,7,14,30,33]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[15,6,12]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,11,13,15]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,4,7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,4,7,14,30,33]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,3,16,15]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6,23]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[16,26,27]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,5,30]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[17,18,20,11]}],"complexes":[],"partners":["TP53","EP300","PARP1","RING1","FOXO3","PTMA","COPS5","KPNA4"],"other_free_text":[]},"mechanistic_narrative":"NUPR1 is a small, intrinsically disordered, chromatin-associated stress-response protein that functions as a transcriptional cofactor to coordinate cell survival, proliferation, and resistance to multiple forms of cell death. NUPR1 is phosphorylated by PKA at Thr68, which enhances its DNA binding, while its nuclear import through a bipartite NLS is regulated by importin α3 binding that is modulated by Thr68 phosphorylation [PMID:11056169, PMID:32933064]; in the nucleus it forms complexes with p53/p300 to transactivate p21 [PMID:18690848], acts as a FoxO3 corepressor to suppress Bnip3-mediated autophagy [PMID:20181828], directly inhibits PARP1 hyperPARylation to protect mitochondrial integrity [PMID:35869257], and transcriptionally activates LCN2 and FTH1 to block iron accumulation and ferroptosis [PMID:33510144, PMID:38802795]. Loss of NUPR1 causes mitochondrial failure, ER stress, and necroptotic or hyperPARylation-dependent cell death, while its pharmacological inhibition by ZZW-115—which blocks importin–NLS interaction—suppresses tumor growth in vivo [PMID:30920390, PMID:30451898]. NUPR1 also cooperates with oncogenic Kras to bypass senescence through Dnmt1-mediated DNA methylation, and Nupr1 deficiency in mice impairs pancreatic intraepithelial neoplasia formation, cardiac hypertrophic remodeling, renal fibrosis, and hematopoietic stem cell quiescence [PMID:24902898, PMID:17116693, PMID:33617091, PMID:33299232]."},"prefetch_data":{"uniprot":{"accession":"O60356","full_name":"Nuclear protein 1","aliases":["Candidate of metastasis 1","Protein p8"],"length_aa":82,"mass_kda":8.9,"function":"Transcription regulator that converts stress signals into a program of gene expression that empowers cells with resistance to the stress induced by a change in their microenvironment. Thereby participates in the regulation of many processes namely cell-cycle, apoptosis, autophagy and DNA repair responses (PubMed:11056169, PubMed:11940591, PubMed:16300740, PubMed:16478804, PubMed:18690848, PubMed:19650074, PubMed:19723804, PubMed:20181828, PubMed:22565310, PubMed:22858377, PubMed:30451898). Controls cell cycle progression and protects cells from genotoxic stress induced by doxorubicin through the complex formation with TP53 and EP300 that binds CDKN1A promoter leading to transcriptional induction of CDKN1A (PubMed:18690848). Protects pancreatic cancer cells from stress-induced cell death by binding the RELB promoter and activating its transcription, leading to IER3 transactivation (PubMed:22565310). Negatively regulates apoptosis through interaction with PTMA (PubMed:16478804). Inhibits autophagy-induced apoptosis in cardiac cells through FOXO3 interaction, inducing cytoplasmic translocation of FOXO3 thereby preventing the FOXO3 association with the pro-autophagic BNIP3 promoter (PubMed:20181828). Inhibits cell growth and facilitates programmed cell death by apoptosis after adriamycin-induced DNA damage through transactivation of TP53 (By similarity). Regulates methamphetamine-induced apoptosis and autophagy through DDIT3-mediated endoplasmic reticulum stress pathway (By similarity). Participates in DNA repair following gamma-irradiation by facilitating DNA access of the transcription machinery through interaction with MSL1 leading to inhibition of histone H4' Lys-16' acetylation (H4K16ac) (PubMed:19650074). Coactivator of PAX2 transcription factor activity, both by recruiting EP300 to increase PAX2 transcription factor activity and by binding PAXIP1 to suppress PAXIP1-induced inhibition on PAX2 (PubMed:11940591). Positively regulates cell cycle progression through interaction with COPS5 inducing cytoplasmic translocation of CDKN1B leading to the CDKN1B degradation (PubMed:16300740). Coordinates, through its interaction with EP300, the association of MYOD1, EP300 and DDX5 to the MYOG promoter, leading to inhibition of cell-cycle progression and myogenic differentiation promotion (PubMed:19723804). Negatively regulates beta cell proliferation via inhibition of cell-cycle regulatory genes expression through the suppression of their promoter activities (By similarity). Also required for LHB expression and ovarian maturation (By similarity). Exacerbates CNS inflammation and demyelination upon cuprizone treatment (By similarity)","subcellular_location":"Nucleus; Cytoplasm; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/O60356/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NUPR1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NUPR1","total_profiled":1310},"omim":[{"mim_id":"614812","title":"NUCLEAR PROTEIN, TRANSCRIPTIONAL REGULATOR, 1; NUPR1","url":"https://www.omim.org/entry/614812"},{"mim_id":"614801","title":"MSL COMPLEX SUBUNIT 1; MSL1","url":"https://www.omim.org/entry/614801"},{"mim_id":"613099","title":"MELANOMA, CUTANEOUS MALIGNANT, SUSCEPTIBILITY TO, 5; CMM5","url":"https://www.omim.org/entry/613099"},{"mim_id":"613098","title":"INCREASED ANALGESIA FROM KAPPA-OPIOID RECEPTOR AGONIST, FEMALE-SPECIFIC","url":"https://www.omim.org/entry/613098"},{"mim_id":"300951","title":"RING FINGER PROTEIN 113A; RNF113A","url":"https://www.omim.org/entry/300951"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytokinetic bridge","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"pancreas","ntpm":1078.9}],"url":"https://www.proteinatlas.org/search/NUPR1"},"hgnc":{"alias_symbol":["COM1","p8"],"prev_symbol":[]},"alphafold":{"accession":"O60356","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60356","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60356-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60356-F1-predicted_aligned_error_v6.png","plddt_mean":70.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NUPR1","jax_strain_url":"https://www.jax.org/strain/search?query=NUPR1"},"sequence":{"accession":"O60356","fasta_url":"https://rest.uniprot.org/uniprotkb/O60356.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60356/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60356"}},"corpus_meta":[{"pmid":"33510144","id":"PMC_33510144","title":"NUPR1 is a critical repressor of ferroptosis.","date":"2021","source":"Nature 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deprivation regulates the stress-inducible gene p8 via the GCN2/ATF4 pathway.","date":"2011","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/21867687","citation_count":18,"is_preprint":false},{"pmid":"35869257","id":"PMC_35869257","title":"NUPR1 protects against hyperPARylation-dependent cell death.","date":"2022","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/35869257","citation_count":17,"is_preprint":false},{"pmid":"12622419","id":"PMC_12622419","title":"Expression of the stress-associated protein p8 is a requisite for tumor development.","date":"2002","source":"International journal of gastrointestinal cancer","url":"https://pubmed.ncbi.nlm.nih.gov/12622419","citation_count":17,"is_preprint":false},{"pmid":"27451286","id":"PMC_27451286","title":"Stress Response Gene Nupr1 Alleviates Cyclosporin A Nephrotoxicity In Vivo.","date":"2016","source":"Journal of the American Society of Nephrology : 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(PKA); phosphorylation by PKA increases secondary structure content and dramatically enhances DNA binding.\",\n      \"method\": \"Circular dichroism, FTIR, NMR spectroscopy, electrophoretic gel shift assay, in vitro PKA phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biophysical methods in vitro with functional DNA-binding readout\",\n      \"pmids\": [\"11056169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NUPR1 (p8) forms a complex with the antiapoptotic protein prothymosin alpha (ProTalpha); the interaction induces conformational changes in both proteins and both must be co-expressed for the antiapoptotic response to staurosporine in HeLa cells.\",\n      \"method\": \"Yeast two-hybrid, fluorescence spectroscopy, circular dichroism, NMR spectroscopy, siRNA knockdown/overexpression, caspase 3/7 and 9 activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (NMR, fluorescence, functional siRNA) in one study\",\n      \"pmids\": [\"16478804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NUPR1 forms a complex with p53 and p300, binds the p21 promoter, and transcriptionally upregulates p21 expression; it also promotes phosphorylation of Rb and upregulation of Bcl-xL, conferring resistance to doxorubicin and Taxol.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), luciferase reporter assay, siRNA knockdown, Western blot\",\n      \"journal\": \"Current cancer drug targets\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and ChIP with functional chemoresistance readout, single lab\",\n      \"pmids\": [\"18690848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p8-deficient mouse embryonic fibroblasts grow more rapidly due to elevated Cdk2/Cdk4 activity and decreased p27 levels, and are more resistant to adriamycin-induced apoptosis; p8 overexpression increases p53 protein level and trans-activation capacity, and p53 negatively trans-activates p8, forming an autoregulatory loop.\",\n      \"method\": \"p8-/- mouse embryonic fibroblasts, kinase activity assay, Western blot, reporter assay, apoptosis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple molecular readouts (Cdk activity, p27, p53), strong mechanistic follow-up\",\n      \"pmids\": [\"11896600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p8 is required for endothelin- and alpha-adrenergic agonist-induced cardiomyocyte hypertrophy and for TNF-stimulated induction of MMP9 and MMP13 in cardiac fibroblasts; p8 associates with chromatin at c-Jun-containing sites on the ANF, MMP9 and MMP13 promoters in a stimulus-dependent manner.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), RNAi knockdown, gene expression analysis, primary cardiomyocyte and fibroblast assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct promoter binding plus RNAi with defined hypertrophic and MMP phenotype\",\n      \"pmids\": [\"17116693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p8 interacts with Jab1; this interaction is required for Jab1-induced translocation of p27 from nucleus to cytoplasm and its subsequent degradation; knockdown of p8 strongly inhibits Jab1 activity.\",\n      \"method\": \"Yeast two-hybrid, His6-pulldown, co-immunoprecipitation, co-localization, siRNA knockdown, p27 localization assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal pulldown/Co-IP with functional p27 degradation readout, supported by knockdown\",\n      \"pmids\": [\"16300740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p8 (NUPR1) acts as a corepressor of FoxO3 transcription factor; p8 knockdown increases FoxO3 nuclear localization, increases FoxO3 association with the Bnip3 promoter, and elevates Bnip3 levels, leading to increased autophagy and apoptosis. p8-/- mice show elevated cardiac autophagy, higher Bnip3, and impaired cardiac function.\",\n      \"method\": \"RNAi in cardiomyocytes/H9C2/U2OS cells, FoxO3 transcriptional activity assay, ChIP, p8-/- mouse cardiac phenotyping, pharmacological autophagy inhibitors, Atg5 siRNA\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, in vitro functional assays, and in vivo KO mouse all supporting same mechanism\",\n      \"pmids\": [\"20181828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p8 (NUPR1) binds to histone acetyltransferase p300 and co-occupies the myogenin promoter together with p300, MyoD, and p68 (Ddx5); p8 knockdown compromises chromatin association of all four proteins, impairs p300-dependent events (Myc expression, histone acetylation, MyoD acetylation) and severely impairs myogenic differentiation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, differentiation assays in C2C12 myoblasts\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, and functional differentiation assay all in agreement\",\n      \"pmids\": [\"19723804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Com-1 (NUPR1) interacts with estrogen receptor-beta (ER-beta) in breast cancer cells as shown by co-immunoprecipitation; ER-beta and Com-1 share identical nuclear localization; 17-beta-estradiol stimulation reduces nuclear Com-1 staining in a ubiquitin-proteasome pathway-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, immunocytochemistry, ribozyme transgene knockdown, ubiquitin/proteasome inhibitor treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP with supporting localization and proteasome inhibitor data, single lab\",\n      \"pmids\": [\"15781258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p8 (NUPR1) shows cell growth-dependent subcellular localization: nuclear in actively dividing sub-confluent cells, nucleo-cytoplasmic in G0/G1-arrested cells. A conserved bipartite NLS (including Lys65, 69, 76, 77) is required for nuclear import. Nuclear localization is energy-dependent and is regulated by acetylation (trichostatin A causes cytoplasmic accumulation). Nuclear export does not involve CRM1.\",\n      \"method\": \"Immunocytochemistry, GFP-fusion protein localization, NLS mutagenesis, pharmacological inhibitors (sodium azide/2-DG, leptomycin B, trichostatin A), live-cell imaging\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct mutagenesis of NLS combined with pharmacological dissection, multiple conditions tested\",\n      \"pmids\": [\"16294328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NUPR1 binds to the C-terminal region of Polycomb protein RING1B with ~10 µM affinity; the binding region on NUPR1 is a hydrophobic patch at the '30s region' (around Ala33); Ala33Gln and Thr68Gln mutations reduce this binding. The interaction is inhibited by trifluoperazine. Interaction was confirmed in cellulo by protein ligation assay.\",\n      \"method\": \"NMR, site-directed mutagenesis, isothermal titration calorimetry, molecular docking, protein ligation assay in cellulo\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR mapping + mutagenesis + in cellulo validation, multiple orthogonal approaches\",\n      \"pmids\": [\"28720707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZZW-115 (a trifluoperazine-derived compound) binds NUPR1 through the region around Thr68, which is located in the NLS region; ZZW-115 inhibits nuclear translocation of NUPR1 by competing with importins, induces tumor regression in xenografted mice, and causes cell death primarily by necroptosis.\",\n      \"method\": \"Biophysical binding assays (ITC, fluorescence), molecular modeling, cell viability assays, mouse xenograft model, nuclear translocation assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding + mechanistic nuclear translocation assay + in vivo tumor regression, multiple methods\",\n      \"pmids\": [\"30920390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NUPR1 binds to several importin proteins (establishing its nuclear translocation mechanism); ZZW-115 competes with importins for binding to the NLS region of NUPR1, inhibiting nuclear translocation; NUPR1 directly stimulates the SUMOylation machinery in a cell-free system, and ZZW-115 reduces SUMOylation of DDR proteins, sensitizing cancer cells to genotoxic agents.\",\n      \"method\": \"Interactome/mass spectrometry proteomics, nuclear translocation assay, cell-free SUMOylation assay with recombinant NUPR1, co-immunoprecipitation, genotoxicity assays\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — cell-free reconstitution of SUMOylation + MS interactome + functional genotoxic sensitization\",\n      \"pmids\": [\"32780723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Phosphorylation of Thr68 in the NLS of NUPR1 hampers its binding to importin α3 (Impα3); the phosphorylated peptide adopts a turn-like conformation (confirmed by 2D NMR NOE), while the unphosphorylated peptide is random coil; removal of Lys65 or Lys69 also reduces binding, indicating importance of positive charges.\",\n      \"method\": \"NMR spectroscopy (2D 1H-NMR, NOE), isothermal titration calorimetry, molecular docking, fluorescence spectroscopy, peptide phospho-mimetic mutagenesis\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structural evidence + ITC binding quantification + mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"32933064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NUPR1 drives ferroptosis resistance by transcriptionally activating LCN2 expression, which reduces intracellular iron accumulation and subsequent oxidative damage; LCN2 depletion mimics NUPR1 deficiency for ferroptosis induction, and re-expression of LCN2 restores resistance in NUPR1-deficient cells.\",\n      \"method\": \"NanoString technology, shRNA knockdown, LCN2 overexpression rescue, pancreas-specific Lcn2 conditional knockout mice, erastin treatment, pancreatitis mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (KO + rescue) with multiple models (cell lines, KO mice), replicated across approaches\",\n      \"pmids\": [\"33510144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NUPR1 binds PARP1 in the nucleus and inhibits PARP1 activity in vitro; NUPR1 inactivation (by ZZW-115 or genetic knockout) leads to hyperPARylation, mitochondrial catastrophe (membrane potential loss, superoxide production, ROS increase, Ca2+ elevation), and cell death through a non-canonical Parthanatos (AIF does not translocate from mitochondria); this cell death is rescued by the PARP inhibitor olaparib or NAD+ precursor NMN.\",\n      \"method\": \"Co-immunoprecipitation (NUPR1–PARP1), in vitro PARP1 activity assay with recombinant NUPR1, NUPR1 mutants (Ala33, Thr68), ZZW-115 treatment, NAD+/NADH measurement, mitochondrial membrane potential, superoxide/ROS assays, olaparib/PARG inhibitor rescue\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution of PARP1 inhibition by recombinant NUPR1 + mutagenesis + multiple cellular rescue experiments\",\n      \"pmids\": [\"35869257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Inactivation of NUPR1 in pancreatic cancer cells causes mitochondrial failure (loss of membrane potential, ROS increase, decreased OXPHOS/ATP), relocation of mitochondria near ER, and ER-stress-coupled necrotic cell death that is reversed by necrostatin-1 (necroptosis inhibitor) but not by Z-VAD-FMK (caspase inhibitor). NUPR1 expression protects acinar cells from necrosis in vivo.\",\n      \"method\": \"NUPR1 shRNA/siRNA knockdown, transcriptomic analysis, mitochondrial membrane potential assay, ROS assay, ATP measurement, necrostatin-1/Z-VAD-FMK rescue, thapsigargin/brefeldin A/tunicamycin ER stress induction, acute pancreatitis mouse model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological rescue experiments plus in vivo model supporting mechanistic model\",\n      \"pmids\": [\"30451898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nupr1 acts as a gene modifier of Kras(G12D)-induced senescence by regulating Dnmt1 expression and genome-wide DNA methylation levels; Nupr1 deficiency in Kras(G12D) mice increases β-galactosidase-positive (senescent) cells and activates the FoxO3a-Skp2-p27Kip1-pRb-E2F senescence pathway in vivo and in vitro.\",\n      \"method\": \"Nupr1-/- × Kras(G12D) mouse genetics, β-galactosidase staining, DNA methylation analysis, RNAi in human pancreatic cancer cells, Dnmt1 expression analysis, FoxO3a/Skp2/p27 pathway analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo (mouse model) corroborated by RNAi in human cell lines with defined pathway\",\n      \"pmids\": [\"26617245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nupr1 cooperates with oncogenic Kras(G12D) to bypass senescence and promote PanIN formation; genetic inactivation of Nupr1 impairs Kras-induced PanIN in mice, increasing senescent (β-galactosidase-positive) cells and activating the FoxO3a-Skp2-p27Kip1-pRb-E2F pathway.\",\n      \"method\": \"Pdx1-cre;LSL-KrasG12D;Nupr1-/- mouse model, β-galactosidase staining, gene expression profiling, RNAi in pancreatic cancer cells, pathway analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic epistasis with molecular pathway characterization\",\n      \"pmids\": [\"24902898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NUPR1 confers chemoresistance in p53-deficient inflammatory breast cancer cells by causing Akt-mediated phosphorylation of p21 and its cytoplasmic re-localization, as well as activation of anti-apoptotic Bcl-xL; this defines a NUPR1-PI3K/Akt-phospho-p21 axis.\",\n      \"method\": \"NUPR1 overexpression/knockdown, Akt inhibitor treatment, Western blot for phospho-p21 and cytoplasmic/nuclear fractionation, Bcl-xL measurement, chemoresistance assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional assay with pathway inhibitors, single lab, no direct reconstitution\",\n      \"pmids\": [\"22858377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p8 expression is required for tumor formation: transformed p8-/- MEFs cannot form colonies in soft agar or tumors in nude mice, while restoration of p8 expression in p8-/- MEFs restores tumor-forming ability.\",\n      \"method\": \"p8-/- MEF transformation with rasV12/E1A, soft agar colony assay, subcutaneous and intraperitoneal tumor formation in nude mice, p8 rescue by re-expression\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO + rescue experiment with defined tumor formation phenotype\",\n      \"pmids\": [\"11818333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NUPR1 knockdown suppresses liver cancer cell invasion in a Ca2+-signaling-dependent manner; granulin was identified as a key downstream transcriptional effector of NUPR1 via promoter binding assay; the NUPR1-granulin pathway is associated with mitochondrial defect-derived glycolytic activation.\",\n      \"method\": \"NUPR1 knockdown, invasion assay with Ca2+ signaling inhibitors, promoter binding (ChIP-like) assay, gene expression profiling\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — promoter binding assay + functional invasion assay with Ca2+ inhibitors, single lab\",\n      \"pmids\": [\"26173068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NUPR1 interacts with aryl hydrocarbon receptor (AhR) and promotes AhR degradation via the autophagy-lysosome pathway and decreased nuclear AhR translocation, thereby reducing CYP enzyme transcription, lowering ROS generation after ionizing radiation, and conferring radioresistance in hepatocellular carcinoma.\",\n      \"method\": \"Co-immunoprecipitation (NUPR1-AhR), RNA sequencing, ROS/lipid peroxidation assays, colony formation assay, xenograft tumor model, AhR activator rescue\",\n      \"journal\": \"BMC medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP for interaction + functional rescue experiments, single lab\",\n      \"pmids\": [\"36258210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NUPR1 promotes cancer cell proliferation and metastasis by directly increasing TFE3 transcriptional activity, which maintains autophagic flux and lysosomal function; NUPR1 knockdown suppresses TFE3-dependent autophagy.\",\n      \"method\": \"NUPR1 stable knockdown, label-free quantitative proteomics, tandem mass tag proteomics, TFE3 activity assay, autophagy flux assay, in vitro and in vivo tumor models\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — proteomics + functional assays supporting NUPR1→TFE3→autophagy axis, single lab\",\n      \"pmids\": [\"35462576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NUPR1 silencing in HCC cells influences expression of RELB and IER3 genes; NUPR1 regulates RUNX2 expression; these together define a NUPR1/RELB/IER3/RUNX2 pathway regulating NF-κB and ERK signaling in HCC.\",\n      \"method\": \"Stable NUPR1 knockdown, gene expression profiling, network analysis, RUNX2/RELB/IER3 siRNA, cell viability/migration assays, sorafenib sensitivity assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — gene expression profiling + functional knockdowns defining a regulatory pathway, single lab\",\n      \"pmids\": [\"27336713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NUPR1 is downregulated in highly malignant tumor-repopulating cells (TRCs) grown in soft fibrin matrices; this downregulation is mediated by YAP nuclear translocation (controlled by Cdc42-mediated F-actin and Lats1); Nupr1 negatively regulates Nestin and Tert expression and suppresses TRC growth.\",\n      \"method\": \"Soft fibrin matrix TRC culture, YAP ChIP at Nupr1 promoter, Nupr1 siRNA/overexpression, Cdc42/Lats1 pathway inhibition, in vivo tumor formation in immune-competent mice\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — ChIP at Nupr1 promoter + functional knockdown/OE with mechanistic upstream pathway\",\n      \"pmids\": [\"27089143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Amino acid starvation induces p8 expression via the GCN2/ATF4 pathway; an Amino Acid Response Element (AARE) in the p8 promoter mediates this regulation; evidence provided in vitro and in vivo.\",\n      \"method\": \"p8 promoter AARE mutagenesis, reporter assay, ATF4 knockdown, GCN2-/- mouse studies, amino acid deprivation experiments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter mutagenesis + genetic KO validation in vivo, moderate evidence for upstream pathway\",\n      \"pmids\": [\"21867687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nupr1 mediates METH-induced neuronal apoptosis and autophagy through the CHOP-Trib3 endoplasmic reticulum stress signaling pathway; silencing Nupr1 reduces METH-induced apoptosis and autophagy both in vitro (neurons, PC12 cells) and in vivo (rat striatum via lentivirus-mediated shRNA).\",\n      \"method\": \"shRNA/siRNA knockdown of Nupr1, CHOP, Trib3 in primary neurons and PC12 cells; lentiviral striatum injection in rats; Western blot for ER stress, apoptosis, autophagy markers\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis by sequential knockdown in vitro + in vivo lentiviral knockdown with defined pathway\",\n      \"pmids\": [\"28694771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nupr1 mediates TGF-β-induced myofibroblast activation and EMT via the Smad3 signaling pathway; Nupr1-/- mice are protected from UUO-induced renal fibrosis; the NUPR1 inhibitor trifluoperazine (TFP) alleviates renal fibrosis in vivo.\",\n      \"method\": \"Nupr1-/- mouse UUO model, TGF-β treatment of fibroblasts/epithelial cells, α-SMA/collagen expression, Smad3 phosphorylation analysis, TFP pharmacological inhibition\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined fibrosis phenotype + mechanistic Smad3 pathway + pharmacological rescue\",\n      \"pmids\": [\"33617091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nupr1 regulates HSC quiescence by inhibiting p53 expression; Nupr1 deletion activates quiescent HSCs and confers competitive engraftment advantage; restoration of p53 in Nupr1-/- HSCs offsets the engraftment advantage.\",\n      \"method\": \"Nupr1-/- mouse model, competitive transplantation assay, serial transplantation, p53 rescue experiment, in vitro expansion protocol\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO + p53 rescue epistasis, clean phenotype but single lab\",\n      \"pmids\": [\"33299232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nupr1 suppresses β-cell proliferation by inhibiting Ccna2 and Tcf19 promoter activities; Nupr1-/- mice have increased β-cell mass due to enhanced islet cell proliferation and are protected from HFD-induced glucose intolerance.\",\n      \"method\": \"Nupr1-/- mouse model, BrdU incorporation (β-cell proliferation), luciferase reporter for Ccna2 and Tcf19 promoters, gene arrays, HFD challenge\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO + promoter reporter assays defining molecular mechanism, in vivo and in vitro concordant\",\n      \"pmids\": [\"23900510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Tumor-derived lactate upregulates NUPR1 expression in tumor-associated macrophages via histone lactylation; NUPR1 then inhibits ERK and JNK signaling, promotes M2 macrophage polarization and PD-L1/SIRPA expression, leading to CD8+ T cell exhaustion and immune suppression.\",\n      \"method\": \"scRNA-seq analysis, functional in vitro and in vivo assays, histone lactylation assay, ERK/JNK pathway analysis, pharmacological NUPR1 inhibition, PD-1 blockade combination experiments\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic pathway with histone lactylation assay and functional rescue, single study\",\n      \"pmids\": [\"40305758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WTAP promotes NUPR1 expression via m6A modification in an eIF3A-mediated manner (m6A-EIF3A mechanism), which stabilizes NUPR1 mRNA; NUPR1 in turn positively regulates LCN2 transcription to suppress ferroptosis in triple-negative breast cancer cells.\",\n      \"method\": \"m6A dot blot assay, RNA immunoprecipitation (RIP), RNA degradation assay, WTAP/NUPR1/LCN2 siRNA, iron/GSH measurements\",\n      \"journal\": \"Biochemical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — m6A assay + RIP + functional ferroptosis readout, single lab\",\n      \"pmids\": [\"37477758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUPR1 promotes FTH1 transcription in HCC cells, enhancing iron storage and conferring resistance to ferroptosis; this is driven upstream by circPIAS1 sponging miR-455-3p to increase NUPR1 levels. ChIP confirmed NUPR1 binding to the FTH1 promoter.\",\n      \"method\": \"RNA immunoprecipitation, luciferase reporter, RNA pulldown, FISH, ChIP (NUPR1 at FTH1 promoter), NUPR1 knockdown/overexpression, ZZW-115 treatment, xenograft mouse model\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP showing direct NUPR1-FTH1 promoter binding + genetic epistasis (rescue) + multiple orthogonal methods\",\n      \"pmids\": [\"38802795\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUPR1 is a small, intrinsically disordered, chromatin-associated transcriptional regulator that, in response to cellular stress, translocates to the nucleus via a bipartite NLS (phosphorylation of Thr68 by PKA promotes DNA binding, while phosphorylation also hampers importin binding) where it binds partners including p53/p300 (to transactivate p21), Polycomb RING1B, PARP1 (inhibiting hyperPARylation and thereby protecting mitochondrial integrity), FoxO3 (corepressor), and chromatin at AP-1-regulated promoters; its key downstream effectors include LCN2 (blocking iron accumulation and ferroptosis), FTH1 (iron storage), Dnmt1 (DNA methylation to bypass Kras-induced senescence), Bnip3 (autophagy regulation), MMP9/13 and ANF (cardiac remodeling), and TFE3 (autophagy flux); NUPR1-deficient cells die by necroptosis or hyperPARylation-dependent mitochondrial catastrophe, establishing NUPR1 as a master stress-survival protein whose pharmacological inhibition (e.g., by ZZW-115 blocking importin-NLS interaction) suppresses tumor growth across multiple cancer types.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NUPR1 is a small, intrinsically disordered, chromatin-associated stress-response protein that functions as a transcriptional cofactor to coordinate cell survival, proliferation, and resistance to multiple forms of cell death. NUPR1 is phosphorylated by PKA at Thr68, which enhances its DNA binding, while its nuclear import through a bipartite NLS is regulated by importin α3 binding that is modulated by Thr68 phosphorylation [PMID:11056169, PMID:32933064]; in the nucleus it forms complexes with p53/p300 to transactivate p21 [PMID:18690848], acts as a FoxO3 corepressor to suppress Bnip3-mediated autophagy [PMID:20181828], directly inhibits PARP1 hyperPARylation to protect mitochondrial integrity [PMID:35869257], and transcriptionally activates LCN2 and FTH1 to block iron accumulation and ferroptosis [PMID:33510144, PMID:38802795]. Loss of NUPR1 causes mitochondrial failure, ER stress, and necroptotic or hyperPARylation-dependent cell death, while its pharmacological inhibition by ZZW-115—which blocks importin–NLS interaction—suppresses tumor growth in vivo [PMID:30920390, PMID:30451898]. NUPR1 also cooperates with oncogenic Kras to bypass senescence through Dnmt1-mediated DNA methylation, and Nupr1 deficiency in mice impairs pancreatic intraepithelial neoplasia formation, cardiac hypertrophic remodeling, renal fibrosis, and hematopoietic stem cell quiescence [PMID:24902898, PMID:17116693, PMID:33617091, PMID:33299232].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing that NUPR1 is an intrinsically disordered protein with HMG-like properties whose DNA-binding activity is dramatically activated by PKA phosphorylation resolved how a small, largely unstructured protein could function at chromatin.\",\n      \"evidence\": \"CD, FTIR, NMR, and gel-shift assays with recombinant human NUPR1 ± PKA treatment\",\n      \"pmids\": [\"11056169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the PKA-targeted residue(s) was not fully mapped at this stage\", \"In vivo relevance of PKA-dependent activation was not tested\", \"Genomic binding sites were unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that p8-null MEFs grow faster (elevated Cdk2/Cdk4, decreased p27), resist apoptosis, and fail to form tumors when transformed established NUPR1 as both a growth suppressor and an essential enabler of tumorigenesis.\",\n      \"evidence\": \"p8−/− MEFs with kinase assays, apoptosis readouts, soft-agar and nude-mouse tumor assays with p8 re-expression rescue\",\n      \"pmids\": [\"11896600\", \"11818333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NUPR1 loss blocks transformation despite accelerating proliferation was unexplained\", \"Downstream transcriptional targets were unidentified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of the bipartite NLS and demonstration that nuclear localization is energy-dependent and acetylation-sensitive explained how NUPR1 subcellular distribution is dynamically regulated with the cell cycle.\",\n      \"evidence\": \"GFP-fusion NLS mutagenesis, pharmacological inhibitors (azide/2-DG, trichostatin A, leptomycin B) in multiple cell lines\",\n      \"pmids\": [\"16294328\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The acetyltransferase responsible was not identified\", \"Export mechanism remained undefined (CRM1-independent)\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing that NUPR1 interacts with Jab1 and is required for Jab1-mediated nuclear-to-cytoplasmic translocation and degradation of p27 provided a direct mechanism linking NUPR1 to cell-cycle control.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, His6-pulldown, p27 localization upon siRNA knockdown\",\n      \"pmids\": [\"16300740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 acts stoichiometrically or catalytically in Jab1 function was unknown\", \"Relevance beyond overexpression system not shown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery of the NUPR1–prothymosin-α complex and its requirement for anti-apoptotic signaling revealed that NUPR1 exerts survival functions through protein–protein interactions beyond chromatin, and that mutual conformational changes accompany binding of two IDPs.\",\n      \"evidence\": \"NMR, fluorescence, CD for structural changes; siRNA and caspase activity assays for function in HeLa cells\",\n      \"pmids\": [\"16478804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of the complex were limited by disorder\", \"Downstream effectors of the anti-apoptotic pathway were not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"ChIP evidence that NUPR1 associates with c-Jun-containing AP-1 sites on the ANF, MMP9, and MMP13 promoters in stimulus-dependent fashion, combined with RNAi phenotypes, established NUPR1 as a chromatin cofactor for cardiac hypertrophic and fibroblast remodeling programs.\",\n      \"evidence\": \"ChIP and RNAi in primary cardiomyocytes and cardiac fibroblasts treated with endothelin/α-adrenergic agonist/TNF\",\n      \"pmids\": [\"17116693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 is recruited by c-Jun directly or through intermediary factors was not resolved\", \"In vivo cardiac remodeling phenotype of Nupr1 KO was not yet reported\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstration that NUPR1 complexes with p53 and p300 on the p21 promoter, upregulates Bcl-xL and phospho-Rb, and confers chemoresistance linked NUPR1's transcriptional cofactor role to a defined drug-resistance mechanism.\",\n      \"evidence\": \"Co-IP, ChIP at p21 promoter, luciferase reporter, siRNA knockdown with doxorubicin/Taxol sensitivity assays\",\n      \"pmids\": [\"18690848\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NUPR1 binds p53 directly or via p300 was unresolved\", \"Single-lab study without independent replication\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of NUPR1 as a FoxO3 corepressor that limits Bnip3 transcription and autophagy, validated by p8−/− mouse cardiac phenotype (elevated autophagy, impaired function), established NUPR1 as a negative regulator of stress-induced autophagy.\",\n      \"evidence\": \"ChIP for FoxO3 at Bnip3 promoter ± p8, RNAi/Atg5 siRNA epistasis, p8−/− mouse cardiac phenotyping\",\n      \"pmids\": [\"20181828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. indirect nature of NUPR1–FoxO3 interaction not biochemically resolved\", \"Autophagy regulation in non-cardiac tissues not examined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing that NUPR1 binds p300, co-occupies the myogenin promoter with MyoD/p68, and is required for chromatin remodeling and myogenic differentiation broadened NUPR1's cofactor role to a developmental differentiation context.\",\n      \"evidence\": \"Co-IP, ChIP at myogenin promoter, siRNA in C2C12 myoblasts with differentiation readout\",\n      \"pmids\": [\"19723804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 is a general p300-scaffold or promoter-selective was unknown\", \"Relevance in vivo during muscle development not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetic demonstration that Nupr1 cooperates with Kras(G12D) to bypass senescence and drive PanIN formation, via the FoxO3a–Skp2–p27–pRb–E2F axis, positioned NUPR1 as a critical node in pancreatic cancer initiation.\",\n      \"evidence\": \"Pdx1-Cre;LSL-KrasG12D;Nupr1−/− mouse model with β-galactosidase staining and pathway analysis\",\n      \"pmids\": [\"24902898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of NUPR1 action on Skp2 was indirect\", \"Human pancreatic cancer genetics for NUPR1 not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of Dnmt1 as a NUPR1-regulated target that mediates genome-wide DNA methylation changes to bypass Kras-induced senescence provided an epigenetic mechanism for NUPR1's oncogenic cooperation.\",\n      \"evidence\": \"Nupr1−/− × KrasG12D mice, DNA methylation analysis, Dnmt1 expression and RNAi in human pancreatic cancer cells\",\n      \"pmids\": [\"26617245\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 directly binds the Dnmt1 promoter was not shown by ChIP\", \"Causal ordering of methylation changes vs. senescence not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"NMR mapping of the NUPR1–RING1B interaction to the hydrophobic '30s region' (Ala33) with ~10 µM affinity, and its inhibition by trifluoperazine, linked NUPR1 to Polycomb-mediated chromatin regulation and opened a pharmacological strategy.\",\n      \"evidence\": \"NMR chemical shift perturbation, ITC, site-directed mutagenesis (Ala33Gln, Thr68Gln), protein ligation assay in cellulo\",\n      \"pmids\": [\"28720707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of NUPR1–RING1B interaction on gene silencing not demonstrated\", \"Whether this interaction occurs on chromatin was unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstration that NUPR1 inactivation causes mitochondrial failure, ER stress, and necroptotic cell death (rescued by necrostatin-1 but not caspase inhibitors) established the mechanistic basis for NUPR1's pro-survival role and the lethal consequence of its loss.\",\n      \"evidence\": \"shRNA/siRNA knockdown, mitochondrial membrane potential/ROS/ATP assays, necrostatin-1 and Z-VAD-FMK rescue, pancreatitis mouse model\",\n      \"pmids\": [\"30451898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the necroptotic executors downstream of mitochondrial failure was not defined\", \"Whether ER stress is cause or consequence of mitochondrial failure was unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Development of ZZW-115, which binds NUPR1 near Thr68 and blocks importin-mediated nuclear translocation, causing tumor regression in vivo, validated NUPR1's nuclear function as druggable and established a pharmacological tool compound.\",\n      \"evidence\": \"ITC/fluorescence binding, nuclear translocation assay, xenograft regression, necroptosis characterization\",\n      \"pmids\": [\"30920390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Off-target effects of ZZW-115 not comprehensively profiled\", \"Pharmacokinetic and toxicity profile limited\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Structural demonstration that Thr68 phosphorylation induces a turn conformation in the NLS peptide and reduces importin α3 binding resolved the apparent paradox that PKA phosphorylation enhances DNA binding but may limit nuclear entry, revealing a regulatory switch.\",\n      \"evidence\": \"2D ¹H-NMR NOE, ITC with importin α3, phospho-mimetic peptides\",\n      \"pmids\": [\"32933064\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo phosphorylation dynamics during stress were not measured\", \"Whether this phospho-switch operates under all stress conditions was untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Proteomic identification of importin partners and demonstration that NUPR1 directly stimulates SUMOylation in a cell-free system linked NUPR1 to the DNA damage response and explained how ZZW-115 sensitizes cells to genotoxic agents.\",\n      \"evidence\": \"MS interactome, cell-free SUMOylation reconstitution with recombinant NUPR1, genotoxicity assays\",\n      \"pmids\": [\"32780723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMOylation substrates specifically dependent on NUPR1 were not fully catalogued\", \"Mechanism by which NUPR1 stimulates the SUMO machinery unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Establishing the NUPR1→LCN2 transcriptional axis as the primary mechanism of ferroptosis resistance, validated by genetic epistasis and conditional KO mice, unified NUPR1's survival role with iron metabolism.\",\n      \"evidence\": \"shRNA + LCN2 rescue, pancreas-specific Lcn2 conditional KO mice, erastin treatment, pancreatitis models\",\n      \"pmids\": [\"33510144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 directly binds the LCN2 promoter via ChIP was not shown in this study\", \"LCN2-independent ferroptosis regulation by NUPR1 not excluded\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing that Nupr1 mediates TGF-β/Smad3-driven myofibroblast activation and that Nupr1-null mice are protected from renal fibrosis extended NUPR1's pathological relevance to fibrotic disease.\",\n      \"evidence\": \"Nupr1−/− UUO mouse model, Smad3 phosphorylation analysis, trifluoperazine pharmacological rescue\",\n      \"pmids\": [\"33617091\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 is a direct Smad3 transcriptional target or responds indirectly was not resolved\", \"NUPR1 interaction with Smad3 at the protein level not demonstrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In vitro reconstitution showing NUPR1 directly binds and inhibits PARP1, and that NUPR1 loss triggers hyperPARylation-dependent mitochondrial catastrophe (rescued by olaparib), identified a fundamentally new molecular activity for NUPR1 as a PARP1 inhibitor.\",\n      \"evidence\": \"Co-IP, in vitro PARP1 activity assay with recombinant NUPR1 and Ala33/Thr68 mutants, NAD+/NADH measurements, olaparib/NMN rescue\",\n      \"pmids\": [\"35869257\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PARP1 inhibition not determined\", \"Whether NUPR1 inhibits other PARP family members was untested\", \"Relative contribution of PARP1 inhibition vs. transcriptional programs to survival unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"ChIP-validated direct binding of NUPR1 to the FTH1 promoter, promoting iron storage and ferroptosis resistance, established a second iron-metabolism arm (alongside LCN2) of the NUPR1 anti-ferroptosis program.\",\n      \"evidence\": \"ChIP at FTH1 promoter, NUPR1 knockdown/overexpression, ZZW-115, xenograft model, circPIAS1/miR-455-3p epistasis\",\n      \"pmids\": [\"38802795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NUPR1 coordinately regulates LCN2 and FTH1 or these are context-dependent was not addressed\", \"Iron-independent functions of FTH1 induction not examined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of NUPR1's interaction with PARP1 and the SUMO machinery, the relative contributions of its transcriptional vs. enzymatic-inhibitory functions to cell survival, whether NUPR1 acts as a general chromatin scaffold or is promoter-selective, and its precise mechanism of nuclear export.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of any NUPR1 complex exists\", \"Genome-wide ChIP-seq for NUPR1 chromatin occupancy has not been reported\", \"In vivo phosphorylation stoichiometry at Thr68 under stress is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 4, 7, 33]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 6, 7, 14, 30, 33]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [15, 6, 12]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 11, 13, 15]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 4, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 4, 7, 14, 30, 33]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 3, 16, 15]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6, 23]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [16, 26, 27]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 5, 30]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [17, 18, 20, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TP53\",\n      \"EP300\",\n      \"PARP1\",\n      \"RING1\",\n      \"FOXO3\",\n      \"PTMA\",\n      \"COPS5\",\n      \"KPNA4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}