{"gene":"HDGF","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2005,"finding":"The HDGF PWWP domain adopts a defined NMR structure and functions as a nonspecific DNA-binding domain, with the C-terminal region differing from a previously determined structure; NMR titrations with DNA propose interaction via the minor groove.","method":"NMR structure determination (NOEs, J-couplings, dipolar couplings), SELEX (selected and amplified binding assay), NMR titrations with DNA","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 — high-resolution NMR structure with functional DNA-binding validation by SELEX and NMR titrations","pmids":["16384999"],"is_preprint":false},{"year":2011,"finding":"The HATH domain of HDGF is essential for both protein-protein and protein-RNA interactions; tandem affinity purification identified 106 HDGF-interacting proteins involved in ribosome biogenesis, RNA processing, DNA damage repair, and transcriptional regulation; HDGF also associates with RNAs.","method":"SBP/Flag-tag tandem affinity purification coupled with LC-MS/MS, Co-IP, RT-PCR RNA co-immunoprecipitation (SBP-RIP)","journal":"Journal of proteomics","confidence":"Medium","confidence_rationale":"Tier 2 — MS-based interactome with domain-deletion validation, single lab","pmids":["21907836"],"is_preprint":false},{"year":2011,"finding":"Cell surface heparan sulfates (HS) are required for HDGF internalization; the HATH/PWWP domain binds HS and enters cells via macropinocytosis; HS-mediated internalization of a receptor-binding-deficient HATH mutant (K96A) inhibits cell migration and proliferation through differential effects on MAPK signaling and matrix metalloprotease expression in NIH 3T3 fibroblasts.","method":"Cell-based internalization assays with HS-deficient cells, macropinocytosis inhibitor studies, migration/proliferation assays, Western blotting for MAPK pathway","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (HS-deficient cells, mutant protein, inhibitor studies, functional assays) in a single study","pmids":["20964630"],"is_preprint":false},{"year":2011,"finding":"p53 transcriptionally represses HDGF by altering HDAC-dependent chromatin remodeling; wild-type p53 introduction decreases endogenous HDGF expression and neutralizing HDGF antibodies block cell growth, migration, and invasion.","method":"p53 overexpression, HDAC-dependent chromatin remodeling assay, neutralizing antibody treatment, cell growth/migration/invasion assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — mechanistic link between p53, HDAC-chromatin remodeling, and HDGF transcription with functional validation by neutralizing antibodies","pmids":["22006999"],"is_preprint":false},{"year":2012,"finding":"HDGF forms heteromers with HRP-2 isoform c (which has a 53-amino acid deletion in its HATH region); this specific heteromer binds chromatin similarly to LEDGF and is displaced from condensed mitotic metaphase chromatin, unlike other HRP-2 isoforms.","method":"Co-immunoprecipitation, chromatin binding assays, identification of novel splice variant","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP with chromatin fractionation, single lab, single study","pmids":["22212508"],"is_preprint":false},{"year":2008,"finding":"HDGF is dephosphorylated during the early steps of TNF+cycloheximide-induced apoptosis in endothelial cells in a caspase-dependent manner, occurring before mitochondrial membrane permeabilization; this dephosphorylation does not affect nuclear localization of HDGF.","method":"2D gel of 32P-labeled samples, mass spectrometry, Western blot, GFP-HDGF live imaging, caspase inhibitor (zVADfmk) experiments","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (2D phosphoproteomics, MS, inhibitor), single lab","pmids":["18465786"],"is_preprint":false},{"year":2008,"finding":"HDGF-deficient (knockout) mice are viable with no apparent morphological abnormalities; HDGF-deficient dermal fibroblasts show unaltered proliferation rates, cell-cycle distributions, and apoptotic rates, demonstrating that HDGF is dispensable for normal mouse development.","method":"Knockout mouse generation (GFP knock-in), cell proliferation assay, cell-cycle analysis, TNFα-induced apoptosis assay","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 1 — genetic knockout with rigorous phenotypic characterization","pmids":["18570251"],"is_preprint":false},{"year":2004,"finding":"HDGF protein is expressed broadly across tissues (highest in brain, testis, lung, and spleen) and localizes to both nucleus and cytoplasm; in cultured neocortical neurons, HDGF is restricted to the soma while the related HRP-3 is also found in neurites; expression is regulated during brain development with peak levels around birth.","method":"Immunohistochemistry, immunocytochemistry with specific antisera, in situ hybridization, Western blot of tissue panels","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with specific validated antisera across multiple tissue types and developmental time points","pmids":["14572309"],"is_preprint":false},{"year":2017,"finding":"HDGF forms a complex with DDX5 and β-catenin; DDX5 directly interacts with HDGF and induces β-catenin-c-Myc signaling, which suppresses miR-296-3p and activates PRKCA-FAK-Ras signaling, cell cycle, and EMT; this was demonstrated by CoIP combined with mass spectrometry and GST pull-down.","method":"Co-immunoprecipitation with mass spectrometry, GST pull-down, ChIP, EMSA, luciferase reporter assays","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — complex identified by CoIP-MS and GST pull-down with functional pathway validation","pmids":["28751441"],"is_preprint":false},{"year":2019,"finding":"ZEB1 interacts with HDGF protein and co-localizes with it in the nucleus; ZEB1 binds to the HDGF promoter as a transcription factor to stimulate HDGF transcription; HDGF in turn promotes β-catenin nuclear translocation and TCF4 interaction, creating a positive feedback loop (ZEB1/HDGF/β-catenin/TCF4) driving endometrial cancer metastasis.","method":"Co-immunoprecipitation, immunofluorescence co-localization, ChIP on HDGF promoter, Western blotting, in vitro/in vivo functional assays","journal":"American journal of cancer research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, and immunofluorescence with functional validation in vitro and in vivo","pmids":["31815037"],"is_preprint":false},{"year":2020,"finding":"HDGF drives Ewing sarcoma metastasis by transcriptionally repressing ALCAM (activated leukocyte cell adhesion molecule), leading to expression and activation of Rho-GTPases Rac1 and Cdc42, actin cytoskeleton remodeling, and increased cell-matrix adhesion; ChIP-seq and gene expression profiling defined the HDGF/ALCAM/GTPase axis.","method":"ChIP-seq, gene expression profiling, functional invasion/migration assays, Rac1/Cdc42 activation assays, in vivo orthotopic murine models, human cohort analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP-seq, expression profiling, and in vivo metastasis models with mechanistic pathway validation","pmids":["33239755"],"is_preprint":false},{"year":2021,"finding":"NAP1L1 interacts with HDGF at the protein level (co-localizing in the cytoplasm); HDGF in turn interacts with c-Jun, leading to induction of CCND1/CDK4/CDK6 expression; this NAP1L1-HDGF-c-Jun-CCND1/CDK4/CDK6 axis promotes glioma proliferation and cisplatin resistance.","method":"Co-immunoprecipitation, immunofluorescence, knockdown/overexpression experiments, Western blotting, in vivo xenograft","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP with functional rescue experiments, single lab","pmids":["34959221"],"is_preprint":false},{"year":2022,"finding":"NAP1L1 interacts with HDGF and recruits DDX5, inducing β-catenin/CCND1 signaling to promote colon cancer cell proliferation; restoration of HDGF or DDX5 rescues growth in NAP1L1-knockdown cells.","method":"Co-immunoprecipitation, knockdown/overexpression rescue experiments, MTT, colony formation, EdU incorporation, in vivo xenograft","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP with functional rescue, single lab","pmids":["36148951"],"is_preprint":false},{"year":2022,"finding":"G3BP2 binds to HDGF mRNA transcript to stabilize it, thereby enhancing HDGF expression and promoting esophageal squamous cell carcinoma cell migration and invasion; LINC01554 maintains G3BP2 expression by protecting it from ubiquitination-dependent degradation.","method":"RNA-seq, RNA immunoprecipitation, co-immunoprecipitation, knockdown/overexpression functional assays, in vivo models","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — RNA-seq, RIP, and functional rescue experiments in a single lab","pmids":["34782720"],"is_preprint":false},{"year":2022,"finding":"Mettl3-mediated N6-methyladenosine (m6A) RNA methylation enhances HDGF mRNA stability and protein expression in M1 macrophages; elevated HDGF in macrophages drives M1 polarization through energy metabolism reprogramming, promoting atherosclerosis.","method":"m6A methylation assays, mRNA stability assays, macrophage-specific HDGF knockout mice, in vivo atherosclerosis model (ApoeKO mice), metabolic analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — m6A modification mechanism with in vivo knockout validation, single lab","pmids":["36265285"],"is_preprint":false},{"year":2023,"finding":"HDGF stimulates mitochondrial ROS generation and bioenergetics (basal and maximal oxygen consumption, oxidative phosphorylation) in hepatoma cells in a dose-dependent manner via the HDGF receptor nucleolin (NCL); an inactive Ser103Ala mutant fails to promote ROS generation or oncogenic behaviors; knockdown of NCL or antibody neutralization of surface NCL abolishes HDGF-induced ROS and mitochondrial energetics.","method":"Recombinant HDGF treatment, active-site mutagenesis (Ser103Ala), Seahorse metabolic flux assay, flow cytometry (ROS detection), NCL knockdown, neutralizing antibody, antioxidant rescue experiments, in vivo orthotopic hepatoma model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — recombinant protein + mutagenesis + metabolic flux assay + receptor knockdown with functional consequences, single lab but multiple orthogonal methods","pmids":["37827291"],"is_preprint":false},{"year":2025,"finding":"HDGF modulates DNA damage response in colorectal cancer by recruiting CtIP (C-terminal binding protein-interacting protein) to facilitate homologous recombination repair; HDGF also serves as a recognition protein for H3K36me3, participating in repair of damaged transcriptionally active genes to maintain genomic stability.","method":"HDGF knockout cells, RNA-seq, Co-IP/interaction assays, drug sensitivity assays","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 2–3 — KO with defined molecular mechanism, single lab","pmids":["40001585"],"is_preprint":false},{"year":2016,"finding":"In ovarian cancer cells, HDGF is predominantly nuclear and passively released by necrotic and late apoptotic cells (functioning as an alarmin); extracellular HDGF stimulates phosphorylation of ERK1/2 and p38 MAPK in both non-cancer and ovarian cancer cells, and enhances cellular migration.","method":"Immunofluorescence imaging, cell fractionation, ELISA (secretion measurement), necrosis/apoptosis induction, ERK/p38 phosphorylation Western blot, migration assays","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization and signaling experiments with multiple readouts, single lab","pmids":["26612514"],"is_preprint":false},{"year":2014,"finding":"The K19 residue in HDGF is crucial for heparin binding; H2CN NMR titrations of side-chain resonances (Hε-Cε-Nζ of Lys, Hδ-Cδ-Nε of Arg) revealed that K19 shows the most significant perturbation upon heparin binding, correlated with free energy changes in mutants.","method":"H2CN NMR pulse sequence, site-directed mutagenesis, NMR titration experiments","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 — NMR with mutagenesis confirming specific residue contributions to heparin binding","pmids":["25117899"],"is_preprint":false},{"year":2015,"finding":"Extracellular/recombinant HDGF activates AKT and MAPK signaling pathways in osteosarcoma cells to stimulate proliferation; intrinsic (intracellular) HDGF is also required for osteosarcoma cell proliferation.","method":"Recombinant HDGF stimulation, Western blotting for AKT/MAPK phosphorylation, siRNA knockdown, MTT proliferation assay","journal":"OncoTargets and therapy","confidence":"Medium","confidence_rationale":"Tier 2–3 — recombinant protein with signaling readout and knockdown, single lab","pmids":["26392778"],"is_preprint":false},{"year":2021,"finding":"HDGF activates the STAT3 signaling pathway (specifically STAT3-Tyr705 and STAT3-Ser727 phosphorylation and STAT3 transcriptional activity) to drive radioresistance in breast cancer; RXRα binding to the HDGF promoter blocks HDGF transcriptional activity; TKT was implicated in HDGF-enhanced STAT3 activity.","method":"HDGF knockdown, Western blotting for STAT3 phosphorylation, RXRα ChIP on HDGF promoter, in vitro and in vivo radioresistance assays","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 — promoter ChIP with signaling readout and functional radioresistance assay, single lab","pmids":["34376200"],"is_preprint":false},{"year":2019,"finding":"HDGF induces macrophage polarization toward M2 type through the IL-4/JAK1/STAT3 signaling pathway; HDGF dose-dependently promotes IL-4 expression in NSCLC cells, which in turn drives M2 polarization.","method":"Western blotting, qRT-PCR, ELISA, flow cytometry, HDGF overexpression, RNA-seq, in vivo tumor model","journal":"Journal of ethnopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — RNA-seq plus multiple functional validation assays, single lab","pmids":["35973634"],"is_preprint":false},{"year":2017,"finding":"HDGF-A isoform is located inside exosomes, whereas HDGF-B and HDGF-C isoforms are found exclusively on the outer surface of exosomes; HDGF-A is also found as unbound protein in conditioned media; the N-terminal peptide of HDGF-A determines intra-exosomal localization.","method":"Exosome isolation, protease protection assay, Western blotting, fractionation of conditioned media","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — fractionation and protease protection experiments demonstrating differential isoform localization, single lab","pmids":["27926477"],"is_preprint":false},{"year":2025,"finding":"FBXW7 (E3 ubiquitin ligase) directly ubiquitinates NAP1L1, promoting its degradation; reduced NAP1L1 impairs recruitment of USP14, decreasing USP14-mediated deubiquitination of HDGF and reducing HDGF protein levels; reduced HDGF in turn suppresses USP14-mediated p62 deubiquitination, promoting autophagy and cisplatin sensitivity in nasopharyngeal carcinoma.","method":"Co-immunoprecipitation, ubiquitination assays, deubiquitination assays, knockdown/overexpression experiments, in vivo NPC models","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 — ubiquitination/deubiquitination assays with functional rescue in vivo, single lab","pmids":["40414865"],"is_preprint":false},{"year":2024,"finding":"IGF2BP2 (m6A reader) binds to and stabilizes HDGF mRNA transcripts in an m6A-dependent manner, promoting HDGF protein expression and ESCC progression.","method":"RNA immunoprecipitation, mRNA stability assays, IGF2BP2 overexpression/knockdown, transcriptome sequencing","journal":"Journal of cancer research and therapeutics","confidence":"Medium","confidence_rationale":"Tier 2–3 — RIP and mRNA stability with functional validation, single lab","pmids":["39206979"],"is_preprint":false},{"year":2025,"finding":"HDGF protects retinal pigment epithelium from ferroptosis via a dual mechanism: activating p38 MAPK/AKT and SIRT1/PGC-1α axes to restore mitochondrial biogenesis, while enhancing the glutathione/GPX4 antioxidant system via the PGC-1α/Nrf2 pathway.","method":"Exogenous HDGF treatment, Western blotting, ROS/lipid peroxidation assays, mitochondrial function assays, pathway inhibitor studies","journal":"Antioxidants","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple signaling pathway readouts with functional phenotype, single lab","pmids":["41462634"],"is_preprint":false},{"year":2022,"finding":"BLM directly interacts with HDGF; HDGF activates KRAS transcription and suppresses RhoA transcription, activating the MAPK/ERK pathway; BLM and HDGF knockdown has synergistic effects on suppressing prostate cancer proliferation and invasion.","method":"Co-immunoprecipitation, ChIP-seq, dual-luciferase reporter assay, Western blotting, in vivo xenograft","journal":"Journal of cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq and dual-luciferase with Co-IP functional validation, single lab","pmids":["36574142"],"is_preprint":false},{"year":2015,"finding":"HDGF knockdown in HCC cells suppresses VEGF expression and reduces in vivo angiogenesis of developed tumors; the anti-tumor effects of HDGF suppression in vivo exceeded the effect predicted from in vitro data alone, implicating angiogenesis as a key effector mechanism.","method":"HDGF shRNA stable knockdown, xenograft murine model, real-time PCR and immunostaining for VEGF and angiogenesis markers","journal":"Anticancer research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro and in vivo knockdown with mechanistic readout (VEGF/angiogenesis), single lab","pmids":["26637859"],"is_preprint":false}],"current_model":"HDGF is a multifunctional heparin-binding nuclear protein whose PWWP/HATH domain mediates non-sequence-selective DNA binding and heparin binding (via K19), is internalized through cell-surface heparan sulfates via macropinocytosis, and signals extracellularly through the receptor nucleolin to activate MAPK/ERK, PI3K/AKT, and STAT3 pathways while stimulating mitochondrial ROS generation; intranuclearly, HDGF is transcriptionally repressed by p53 through HDAC-dependent chromatin remodeling, forms complexes with DDX5 and β-catenin to regulate miRNA expression and Wnt/β-catenin signaling, recruits CtIP for homologous recombination DNA repair at H3K36me3-marked loci, interacts with NAP1L1/USP14 in a deubiquitination regulatory axis, and is subject to caspase-dependent dephosphorylation during apoptosis; together these mechanisms underlie HDGF's roles in cell proliferation, angiogenesis (partly via VEGF upregulation), EMT, metastasis, and chemoresistance."},"narrative":{"teleology":[{"year":2004,"claim":"Establishing the baseline expression and subcellular distribution of HDGF across tissues answered where and when this growth factor operates, revealing broad expression with nuclear/cytoplasmic dual localization and developmental regulation in the brain.","evidence":"Immunohistochemistry, immunocytochemistry, Western blotting across mouse tissue panels and developmental time points","pmids":["14572309"],"confidence":"Medium","gaps":["No functional consequence of developmental regulation demonstrated","Mechanism controlling nuclear vs. cytoplasmic partitioning not defined"]},{"year":2005,"claim":"Solving the NMR structure of the PWWP domain and demonstrating its non-sequence-selective DNA-binding activity established the molecular basis for HDGF's chromatin association.","evidence":"NMR structure determination, SELEX, and NMR titrations with DNA","pmids":["16384999"],"confidence":"High","gaps":["No specific genomic target sites identified","Functional consequence of DNA binding on gene regulation not tested"]},{"year":2008,"claim":"Generation of HDGF-knockout mice showed the gene is dispensable for normal development, raising the question of whether its growth-factor activities are redundant with HRP family members or context-dependent.","evidence":"HDGF-null mice (GFP knock-in) with proliferation, cell-cycle, and apoptosis assays on dermal fibroblasts","pmids":["18570251"],"confidence":"High","gaps":["Compensation by HRP-2/HRP-3 not formally tested","Stress or disease-specific phenotypes not examined in knockout"]},{"year":2008,"claim":"Demonstrating caspase-dependent dephosphorylation of HDGF during apoptosis revealed that HDGF is an early target of the apoptotic signaling cascade, though the kinase/phosphatase pair and functional consequence remain unclear.","evidence":"2D phosphoproteomics, mass spectrometry, GFP-HDGF imaging, caspase inhibitor experiments in endothelial cells","pmids":["18465786"],"confidence":"Medium","gaps":["Identity of the phosphatase mediating dephosphorylation unknown","Functional impact of dephosphorylation on HDGF activity not determined"]},{"year":2011,"claim":"Identifying heparan sulfate-dependent macropinocytic internalization and the HATH domain as the entry module resolved how extracellular HDGF re-enters cells and differentially affects MAPK signaling depending on receptor engagement.","evidence":"Internalization assays in HS-deficient cells, macropinocytosis inhibitors, K96A mutant, migration/proliferation assays in NIH 3T3 fibroblasts","pmids":["20964630"],"confidence":"High","gaps":["Identity of the cell-surface receptor mediating HS-independent signaling not defined here","Whether macropinocytosis is the sole route of entry in vivo unknown"]},{"year":2011,"claim":"Tandem affinity purification revealing 106 HATH-domain-dependent interactors, plus RNA co-immunoprecipitation, expanded HDGF from a simple growth factor to a multifunctional hub in ribosome biogenesis, RNA processing, and DNA repair.","evidence":"SBP/Flag tandem affinity purification with LC-MS/MS, Co-IP, RT-PCR SBP-RIP","pmids":["21907836"],"confidence":"Medium","gaps":["Most interactors not individually validated by reciprocal methods","RNA targets not identified at sequence level"]},{"year":2011,"claim":"Showing that p53 transcriptionally represses HDGF through HDAC-dependent chromatin remodeling established a direct tumor-suppressor–oncoprotein regulatory axis.","evidence":"p53 overexpression, HDAC chromatin remodeling assay, neutralizing antibody functional studies","pmids":["22006999"],"confidence":"High","gaps":["Specific p53 binding site on HDGF promoter not mapped","Whether other p53 family members also repress HDGF untested"]},{"year":2014,"claim":"Pinpointing K19 as the critical residue for heparin binding by NMR titration of side-chain resonances provided atomic-level understanding of the HDGF–heparan sulfate interaction.","evidence":"H2CN NMR pulse sequence with site-directed mutagenesis","pmids":["25117899"],"confidence":"High","gaps":["Structural model of full heparin–PWWP complex not determined","In vivo relevance of K19 mutation not tested"]},{"year":2015,"claim":"Demonstrating that HDGF knockdown suppresses VEGF and in vivo angiogenesis in HCC established a mechanistic link between HDGF and tumor vascularization.","evidence":"shRNA knockdown, xenograft models, VEGF mRNA/protein quantification","pmids":["26637859"],"confidence":"Medium","gaps":["Direct vs. indirect regulation of VEGF transcription by HDGF not resolved","Whether HDGF signals through autocrine or paracrine VEGF induction unclear"]},{"year":2016,"claim":"Identifying HDGF as a passively released alarmin from necrotic/apoptotic cells that activates ERK1/2 and p38 MAPK revealed a damage-associated molecular pattern function distinct from its growth-factor role.","evidence":"ELISA, cell fractionation, necrosis/apoptosis induction, phospho-Western blotting, migration assays in ovarian cancer cells","pmids":["26612514"],"confidence":"Medium","gaps":["Receptor mediating alarmin signaling not identified in this study","Whether alarmin function operates in non-cancer contexts unknown"]},{"year":2017,"claim":"Discovery of the HDGF–DDX5–β-catenin complex and its suppression of miR-296-3p to activate PRKCA-FAK-Ras signaling defined a nuclear transcriptional mechanism linking HDGF to Wnt pathway output and EMT.","evidence":"Co-IP with mass spectrometry, GST pull-down, ChIP, EMSA, luciferase reporter assays","pmids":["28751441"],"confidence":"High","gaps":["Stoichiometry and assembly order of the trimeric complex not determined","Whether HDGF DNA-binding activity is required for complex function untested"]},{"year":2017,"claim":"Demonstrating that HDGF isoforms are differentially sorted into or onto exosomes (HDGF-A inside, HDGF-B/C on the surface) revealed an unconventional secretion mechanism with isoform-specific trafficking.","evidence":"Exosome isolation, protease protection assay, conditioned media fractionation","pmids":["27926477"],"confidence":"Medium","gaps":["Functional consequence of exosomal HDGF delivery on recipient cells not tested","Sorting signal beyond N-terminal peptide not fully defined"]},{"year":2019,"claim":"Identification of a ZEB1→HDGF→β-catenin/TCF4 positive feedback loop driving endometrial cancer metastasis showed how HDGF integrates EMT transcription factor input with Wnt signaling amplification.","evidence":"Reciprocal Co-IP, ChIP on HDGF promoter, immunofluorescence, in vitro and in vivo functional assays","pmids":["31815037"],"confidence":"High","gaps":["Whether the feedback loop operates in normal tissues unknown","Mechanism of HDGF-induced β-catenin nuclear translocation not resolved"]},{"year":2020,"claim":"ChIP-seq and functional studies revealing that HDGF transcriptionally represses ALCAM to activate Rac1/Cdc42 and cytoskeletal remodeling defined a nuclear mechanism for HDGF-driven metastasis in Ewing sarcoma.","evidence":"ChIP-seq, gene expression profiling, Rac1/Cdc42 activation assays, orthotopic murine models","pmids":["33239755"],"confidence":"High","gaps":["Whether HDGF directly binds the ALCAM promoter or acts through a co-repressor complex not distinguished","Generalizability to non-Ewing sarcoma contexts untested"]},{"year":2021,"claim":"Linking HDGF to STAT3 pathway activation (Tyr705/Ser727 phosphorylation) in radioresistance, with RXRα acting as a transcriptional repressor of HDGF, added a new signaling axis and therapeutic vulnerability.","evidence":"HDGF knockdown, STAT3 phosphorylation Western blots, RXRα ChIP on HDGF promoter, in vitro/in vivo radioresistance assays","pmids":["34376200"],"confidence":"Medium","gaps":["Whether HDGF activates STAT3 directly or through an intermediate kinase unresolved","TKT's mechanistic role in HDGF–STAT3 signaling incompletely defined"]},{"year":2022,"claim":"Convergent studies showed NAP1L1 interacts with HDGF to bridge DDX5/β-catenin signaling in colon cancer and c-Jun/CCND1 signaling in glioma, establishing NAP1L1 as a context-dependent upstream scaffold for HDGF oncogenic functions.","evidence":"Co-IP, knockdown/overexpression rescue, xenograft models in colon cancer and glioma cells","pmids":["34959221","36148951"],"confidence":"Medium","gaps":["Direct binding interface between NAP1L1 and HDGF not mapped","Whether NAP1L1–HDGF interaction is constitutive or signal-regulated unknown"]},{"year":2022,"claim":"Discovery that m6A modification and RNA-binding proteins (G3BP2, later IGF2BP2) stabilize HDGF mRNA revealed a post-transcriptional regulatory layer controlling HDGF abundance in cancer and macrophage biology.","evidence":"Mettl3-dependent m6A assays, mRNA stability assays, RIP, macrophage-specific HDGF KO mice in atherosclerosis models; IGF2BP2 RIP and stability assays in ESCC","pmids":["36265285","34782720","39206979"],"confidence":"Medium","gaps":["Specific m6A sites on HDGF mRNA not mapped at nucleotide resolution in all studies","Relative contribution of transcriptional vs. post-transcriptional regulation in different cell types unclear"]},{"year":2023,"claim":"Identifying nucleolin (NCL) as the surface receptor through which extracellular HDGF stimulates mitochondrial ROS and oxidative phosphorylation, with Ser103 required for activity, resolved a long-standing question about the identity of the HDGF receptor.","evidence":"Recombinant HDGF, Ser103Ala mutagenesis, Seahorse metabolic flux, NCL knockdown, neutralizing antibody, orthotopic hepatoma model","pmids":["37827291"],"confidence":"High","gaps":["Whether NCL is the sole HDGF receptor or acts with co-receptors not excluded","Structural basis of HDGF–NCL interaction unknown"]},{"year":2025,"claim":"Demonstrating that HDGF recruits CtIP to H3K36me3-marked chromatin to facilitate homologous recombination established HDGF as a reader-effector linking active chromatin marks to DNA damage repair.","evidence":"HDGF knockout cells, RNA-seq, Co-IP/interaction assays, drug sensitivity assays in colorectal cancer","pmids":["40001585"],"confidence":"Medium","gaps":["Whether PWWP domain directly reads H3K36me3 in the context of HR repair not formally shown","Structural basis of CtIP recruitment by HDGF not determined"]},{"year":2025,"claim":"Placing HDGF within the FBXW7→NAP1L1→USP14 deubiquitination axis showed that HDGF protein stability is regulated by ubiquitin-dependent proteostasis, connecting HDGF levels to autophagy and chemosensitivity.","evidence":"Ubiquitination/deubiquitination assays, Co-IP, knockdown/overexpression, in vivo NPC models","pmids":["40414865"],"confidence":"Medium","gaps":["Specific ubiquitination sites on HDGF not mapped","Whether other E3 ligases target HDGF directly unknown"]},{"year":null,"claim":"A high-resolution structure of full-length HDGF in complex with nucleolin, heparan sulfate, or chromatin substrates is lacking, and the relative contributions of intracellular versus extracellular HDGF pools to its diverse signaling outputs remain mechanistically unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No crystal or cryo-EM structure of full-length HDGF or HDGF–NCL complex","Relative physiological importance of intracellular chromatin functions vs. extracellular growth factor signaling undetermined","Functional redundancy with HRP-2 and HRP-3 not systematically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,10,16,26]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10,26,9]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[16]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[2,15,17,19]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,9,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,11]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[17,22]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[4,16]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[22]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,15,19,20,25]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,10,26]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[14,21]}],"complexes":["HDGF–DDX5–β-catenin","HDGF–HRP-2c heteromer","NAP1L1–HDGF–USP14"],"partners":["DDX5","CTNNB1","NCL","NAP1L1","RBBP8","ZEB1","BLM","HDGFL1"],"other_free_text":[]},"mechanistic_narrative":"HDGF is a heparin-binding nuclear growth factor that functions both as an intracellular chromatin-associated regulator and as an extracellular signaling molecule, linking transcriptional control, DNA damage repair, and mitogenic signaling to cell proliferation, angiogenesis, and epithelial-mesenchymal transition. Its N-terminal PWWP/HATH domain mediates non-sequence-selective DNA binding, heparin binding (critically dependent on residue K19), RNA association, and protein–protein interactions, while cell-surface heparan sulfates and the receptor nucleolin mediate its internalization via macropinocytosis and activation of MAPK/ERK, PI3K/AKT, and STAT3 signaling cascades [PMID:16384999, PMID:25117899, PMID:20964630, PMID:37827291, PMID:26392778]. In the nucleus, HDGF forms complexes with DDX5 and β-catenin to regulate Wnt/β-catenin–c-Myc signaling and miRNA expression, transcriptionally represses targets such as ALCAM to control Rho-GTPase-dependent cytoskeletal remodeling, activates KRAS transcription, and recruits CtIP to H3K36me3-marked loci to facilitate homologous recombination repair [PMID:28751441, PMID:33239755, PMID:40001585, PMID:36574142]. HDGF expression is transcriptionally repressed by p53 through HDAC-dependent chromatin remodeling and post-transcriptionally stabilized by m6A methylation readers (IGF2BP2) and RNA-binding proteins (G3BP2), while its protein levels are regulated by USP14-mediated deubiquitination downstream of NAP1L1; HDGF-null mice are viable, indicating functional redundancy during normal development [PMID:22006999, PMID:36265285, PMID:40414865, PMID:18570251]."},"prefetch_data":{"uniprot":{"accession":"P51858","full_name":"Hepatoma-derived growth factor","aliases":["High mobility group protein 1-like 2","HMG-1L2"],"length_aa":240,"mass_kda":26.8,"function":"Acts as a transcriptional repressor (PubMed:17974029). Has mitogenic activity for fibroblasts (PubMed:11751870, PubMed:26845719). Heparin-binding protein (PubMed:15491618) Does not have mitogenic activity for fibroblasts (PubMed:26845719). Does not bind heparin (PubMed:26845719) Has mitogenic activity for fibroblasts (PubMed:26845719). 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advances","url":"https://pubmed.ncbi.nlm.nih.gov/35395072","citation_count":4,"is_preprint":false},{"pmid":"27926477","id":"PMC_27926477","title":"Intra- or extra-exosomal secretion of HDGF isoforms: the extraordinary function of the HDGF-A N-terminal peptide.","date":"2017","source":"Biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27926477","citation_count":3,"is_preprint":false},{"pmid":"36694627","id":"PMC_36694627","title":"circ-IARS depletion inhibits the progression of non-small-cell lung cancer by circ-IARS/miR-1252-5p/HDGF ceRNA pathway.","date":"2023","source":"Open medicine (Warsaw, Poland)","url":"https://pubmed.ncbi.nlm.nih.gov/36694627","citation_count":3,"is_preprint":false},{"pmid":"18478933","id":"PMC_18478933","title":"[Expression of HDGF and its implication in stage I non-small cell lung cancer].","date":"2007","source":"Zhonghua zhong liu za zhi [Chinese journal of oncology]","url":"https://pubmed.ncbi.nlm.nih.gov/18478933","citation_count":3,"is_preprint":false},{"pmid":"39041204","id":"PMC_39041204","title":"Anti-HDGF Antibody Targets EGFR Tyrosine Kinase Inhibitor-Tolerant Cells in NSCLC Patient-Derived Xenografts.","date":"2024","source":"Cancer research communications","url":"https://pubmed.ncbi.nlm.nih.gov/39041204","citation_count":2,"is_preprint":false},{"pmid":"40414865","id":"PMC_40414865","title":"NAP1L1 degradation by FBXW7 reduces the deubiquitination of HDGF-p62 signaling to stimulate autophagy and induce primary cisplatin chemosensitivity in nasopharyngeal carcinoma.","date":"2025","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/40414865","citation_count":2,"is_preprint":false},{"pmid":"40643435","id":"PMC_40643435","title":"Targeting the HNRNPA2B1/HDGF/PTN Axis to Overcome Radioresistance in Non-Small Cell Lung Cancer.","date":"2025","source":"Antioxidants & redox signaling","url":"https://pubmed.ncbi.nlm.nih.gov/40643435","citation_count":1,"is_preprint":false},{"pmid":"37384958","id":"PMC_37384958","title":"Decreased acetylation of HDGF improves oviduct production in Rana dybowskii, Rana amurensis, and Rana huanrenensis.","date":"2023","source":"Comparative biochemistry and physiology. Part D, Genomics & proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/37384958","citation_count":1,"is_preprint":false},{"pmid":"32647008","id":"PMC_32647008","title":"Motoneuron expression profiling identifies an association between an axonal splice variant of HDGF-related protein 3 and peripheral myelination.","date":"2020","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32647008","citation_count":1,"is_preprint":false},{"pmid":"37920439","id":"PMC_37920439","title":"[Retracted] MicroRNA‑139‑5p inhibits cell viability, migration and invasion and suppresses tumor growth by targeting HDGF in non‑small cell lung cancer.","date":"2023","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/37920439","citation_count":1,"is_preprint":false},{"pmid":"41418975","id":"PMC_41418975","title":"A KAT7-lncPVT1 positive feedback loop promotes lung cancer carcinogenesis and therapy resistance via H3K14ac/HDGF/PI3K/AKT Axis.","date":"2025","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/41418975","citation_count":0,"is_preprint":false},{"pmid":"41278276","id":"PMC_41278276","title":"Downregulation of HDGF inhibits tumorigenic phenotypes of hypopharyngeal squamous cell carcinoma by suppressing the AKT/mTOR/VEGF pathway.","date":"2025","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41278276","citation_count":0,"is_preprint":false},{"pmid":"41234080","id":"PMC_41234080","title":"[CircRAD18 Regulates Daunorubicin Resistance in Acute Myeloid Leukemia Cells through MiR-185-5p/HDGF Axis].","date":"2025","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/41234080","citation_count":0,"is_preprint":false},{"pmid":"41462634","id":"PMC_41462634","title":"HDGF Protects Retinal Pigment Epithelium from Glyoxal-Induced Ferroptosis via SIRT1/PGC-1α/Nrf2 Pathway.","date":"2025","source":"Antioxidants (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/41462634","citation_count":0,"is_preprint":false},{"pmid":"40770862","id":"PMC_40770862","title":"HDGF derived from Müller cells enhances the activation of microglia in diabetic retinopathy.","date":"2025","source":"Journal of biomedical research","url":"https://pubmed.ncbi.nlm.nih.gov/40770862","citation_count":0,"is_preprint":false},{"pmid":"34526780","id":"PMC_34526780","title":"Long Non-Coding RNA ASB16-AS1 Functions as a miR-760 Sponge to Facilitate the Malignant Phenotype of Osteosarcoma by Increasing HDGF Expression [Retraction].","date":"2021","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/34526780","citation_count":0,"is_preprint":false},{"pmid":"41467359","id":"PMC_41467359","title":"Multi-Omics Analysis Reveals That the MAZ/HDGF Regulatory Axis Drives High-Grade Serous Ovarian Cancer Progression by Modulating Glycolysis and M2 Macrophage Polarization.","date":"2026","source":"IUBMB life","url":"https://pubmed.ncbi.nlm.nih.gov/41467359","citation_count":0,"is_preprint":false},{"pmid":"33030654","id":"PMC_33030654","title":"Correction to: A complex mechanism for HDGF-mediated cell growth, migration, invasion, and TMZ chemosensitivity in glioma.","date":"2020","source":"Journal of neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33030654","citation_count":0,"is_preprint":false},{"pmid":"34675543","id":"PMC_34675543","title":"MicroRNA-939 Directly Targets HDGF to Inhibit the Aggressiveness of Prostate Cancer via Deactivation of the WNT/β-Catenin Pathway [Retraction].","date":"2021","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/34675543","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.06.04.25329006","title":"Proteomic and genetic insights into ancestry-specific associations in Parkinson’s disease","date":"2025-06-06","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.04.25329006","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.03.07.25323594","title":"Proteomics analysis of plasma for risk of sepsis: Findings from the Atherosclerosis Risk in Communities Study","date":"2025-03-10","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.07.25323594","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46848,"output_tokens":6525,"usd":0.119209},"stage2":{"model":"claude-opus-4-6","input_tokens":10244,"output_tokens":4876,"usd":0.25968},"total_usd":0.378889,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"The HDGF PWWP domain adopts a defined NMR structure and functions as a nonspecific DNA-binding domain, with the C-terminal region differing from a previously determined structure; NMR titrations with DNA propose interaction via the minor groove.\",\n      \"method\": \"NMR structure determination (NOEs, J-couplings, dipolar couplings), SELEX (selected and amplified binding assay), NMR titrations with DNA\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution NMR structure with functional DNA-binding validation by SELEX and NMR titrations\",\n      \"pmids\": [\"16384999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The HATH domain of HDGF is essential for both protein-protein and protein-RNA interactions; tandem affinity purification identified 106 HDGF-interacting proteins involved in ribosome biogenesis, RNA processing, DNA damage repair, and transcriptional regulation; HDGF also associates with RNAs.\",\n      \"method\": \"SBP/Flag-tag tandem affinity purification coupled with LC-MS/MS, Co-IP, RT-PCR RNA co-immunoprecipitation (SBP-RIP)\",\n      \"journal\": \"Journal of proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS-based interactome with domain-deletion validation, single lab\",\n      \"pmids\": [\"21907836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cell surface heparan sulfates (HS) are required for HDGF internalization; the HATH/PWWP domain binds HS and enters cells via macropinocytosis; HS-mediated internalization of a receptor-binding-deficient HATH mutant (K96A) inhibits cell migration and proliferation through differential effects on MAPK signaling and matrix metalloprotease expression in NIH 3T3 fibroblasts.\",\n      \"method\": \"Cell-based internalization assays with HS-deficient cells, macropinocytosis inhibitor studies, migration/proliferation assays, Western blotting for MAPK pathway\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (HS-deficient cells, mutant protein, inhibitor studies, functional assays) in a single study\",\n      \"pmids\": [\"20964630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"p53 transcriptionally represses HDGF by altering HDAC-dependent chromatin remodeling; wild-type p53 introduction decreases endogenous HDGF expression and neutralizing HDGF antibodies block cell growth, migration, and invasion.\",\n      \"method\": \"p53 overexpression, HDAC-dependent chromatin remodeling assay, neutralizing antibody treatment, cell growth/migration/invasion assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link between p53, HDAC-chromatin remodeling, and HDGF transcription with functional validation by neutralizing antibodies\",\n      \"pmids\": [\"22006999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HDGF forms heteromers with HRP-2 isoform c (which has a 53-amino acid deletion in its HATH region); this specific heteromer binds chromatin similarly to LEDGF and is displaced from condensed mitotic metaphase chromatin, unlike other HRP-2 isoforms.\",\n      \"method\": \"Co-immunoprecipitation, chromatin binding assays, identification of novel splice variant\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP with chromatin fractionation, single lab, single study\",\n      \"pmids\": [\"22212508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HDGF is dephosphorylated during the early steps of TNF+cycloheximide-induced apoptosis in endothelial cells in a caspase-dependent manner, occurring before mitochondrial membrane permeabilization; this dephosphorylation does not affect nuclear localization of HDGF.\",\n      \"method\": \"2D gel of 32P-labeled samples, mass spectrometry, Western blot, GFP-HDGF live imaging, caspase inhibitor (zVADfmk) experiments\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (2D phosphoproteomics, MS, inhibitor), single lab\",\n      \"pmids\": [\"18465786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HDGF-deficient (knockout) mice are viable with no apparent morphological abnormalities; HDGF-deficient dermal fibroblasts show unaltered proliferation rates, cell-cycle distributions, and apoptotic rates, demonstrating that HDGF is dispensable for normal mouse development.\",\n      \"method\": \"Knockout mouse generation (GFP knock-in), cell proliferation assay, cell-cycle analysis, TNFα-induced apoptosis assay\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genetic knockout with rigorous phenotypic characterization\",\n      \"pmids\": [\"18570251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HDGF protein is expressed broadly across tissues (highest in brain, testis, lung, and spleen) and localizes to both nucleus and cytoplasm; in cultured neocortical neurons, HDGF is restricted to the soma while the related HRP-3 is also found in neurites; expression is regulated during brain development with peak levels around birth.\",\n      \"method\": \"Immunohistochemistry, immunocytochemistry with specific antisera, in situ hybridization, Western blot of tissue panels\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with specific validated antisera across multiple tissue types and developmental time points\",\n      \"pmids\": [\"14572309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HDGF forms a complex with DDX5 and β-catenin; DDX5 directly interacts with HDGF and induces β-catenin-c-Myc signaling, which suppresses miR-296-3p and activates PRKCA-FAK-Ras signaling, cell cycle, and EMT; this was demonstrated by CoIP combined with mass spectrometry and GST pull-down.\",\n      \"method\": \"Co-immunoprecipitation with mass spectrometry, GST pull-down, ChIP, EMSA, luciferase reporter assays\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — complex identified by CoIP-MS and GST pull-down with functional pathway validation\",\n      \"pmids\": [\"28751441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZEB1 interacts with HDGF protein and co-localizes with it in the nucleus; ZEB1 binds to the HDGF promoter as a transcription factor to stimulate HDGF transcription; HDGF in turn promotes β-catenin nuclear translocation and TCF4 interaction, creating a positive feedback loop (ZEB1/HDGF/β-catenin/TCF4) driving endometrial cancer metastasis.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, ChIP on HDGF promoter, Western blotting, in vitro/in vivo functional assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, and immunofluorescence with functional validation in vitro and in vivo\",\n      \"pmids\": [\"31815037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HDGF drives Ewing sarcoma metastasis by transcriptionally repressing ALCAM (activated leukocyte cell adhesion molecule), leading to expression and activation of Rho-GTPases Rac1 and Cdc42, actin cytoskeleton remodeling, and increased cell-matrix adhesion; ChIP-seq and gene expression profiling defined the HDGF/ALCAM/GTPase axis.\",\n      \"method\": \"ChIP-seq, gene expression profiling, functional invasion/migration assays, Rac1/Cdc42 activation assays, in vivo orthotopic murine models, human cohort analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP-seq, expression profiling, and in vivo metastasis models with mechanistic pathway validation\",\n      \"pmids\": [\"33239755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NAP1L1 interacts with HDGF at the protein level (co-localizing in the cytoplasm); HDGF in turn interacts with c-Jun, leading to induction of CCND1/CDK4/CDK6 expression; this NAP1L1-HDGF-c-Jun-CCND1/CDK4/CDK6 axis promotes glioma proliferation and cisplatin resistance.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, knockdown/overexpression experiments, Western blotting, in vivo xenograft\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP with functional rescue experiments, single lab\",\n      \"pmids\": [\"34959221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NAP1L1 interacts with HDGF and recruits DDX5, inducing β-catenin/CCND1 signaling to promote colon cancer cell proliferation; restoration of HDGF or DDX5 rescues growth in NAP1L1-knockdown cells.\",\n      \"method\": \"Co-immunoprecipitation, knockdown/overexpression rescue experiments, MTT, colony formation, EdU incorporation, in vivo xenograft\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP with functional rescue, single lab\",\n      \"pmids\": [\"36148951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"G3BP2 binds to HDGF mRNA transcript to stabilize it, thereby enhancing HDGF expression and promoting esophageal squamous cell carcinoma cell migration and invasion; LINC01554 maintains G3BP2 expression by protecting it from ubiquitination-dependent degradation.\",\n      \"method\": \"RNA-seq, RNA immunoprecipitation, co-immunoprecipitation, knockdown/overexpression functional assays, in vivo models\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — RNA-seq, RIP, and functional rescue experiments in a single lab\",\n      \"pmids\": [\"34782720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mettl3-mediated N6-methyladenosine (m6A) RNA methylation enhances HDGF mRNA stability and protein expression in M1 macrophages; elevated HDGF in macrophages drives M1 polarization through energy metabolism reprogramming, promoting atherosclerosis.\",\n      \"method\": \"m6A methylation assays, mRNA stability assays, macrophage-specific HDGF knockout mice, in vivo atherosclerosis model (ApoeKO mice), metabolic analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — m6A modification mechanism with in vivo knockout validation, single lab\",\n      \"pmids\": [\"36265285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HDGF stimulates mitochondrial ROS generation and bioenergetics (basal and maximal oxygen consumption, oxidative phosphorylation) in hepatoma cells in a dose-dependent manner via the HDGF receptor nucleolin (NCL); an inactive Ser103Ala mutant fails to promote ROS generation or oncogenic behaviors; knockdown of NCL or antibody neutralization of surface NCL abolishes HDGF-induced ROS and mitochondrial energetics.\",\n      \"method\": \"Recombinant HDGF treatment, active-site mutagenesis (Ser103Ala), Seahorse metabolic flux assay, flow cytometry (ROS detection), NCL knockdown, neutralizing antibody, antioxidant rescue experiments, in vivo orthotopic hepatoma model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — recombinant protein + mutagenesis + metabolic flux assay + receptor knockdown with functional consequences, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"37827291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HDGF modulates DNA damage response in colorectal cancer by recruiting CtIP (C-terminal binding protein-interacting protein) to facilitate homologous recombination repair; HDGF also serves as a recognition protein for H3K36me3, participating in repair of damaged transcriptionally active genes to maintain genomic stability.\",\n      \"method\": \"HDGF knockout cells, RNA-seq, Co-IP/interaction assays, drug sensitivity assays\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — KO with defined molecular mechanism, single lab\",\n      \"pmids\": [\"40001585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In ovarian cancer cells, HDGF is predominantly nuclear and passively released by necrotic and late apoptotic cells (functioning as an alarmin); extracellular HDGF stimulates phosphorylation of ERK1/2 and p38 MAPK in both non-cancer and ovarian cancer cells, and enhances cellular migration.\",\n      \"method\": \"Immunofluorescence imaging, cell fractionation, ELISA (secretion measurement), necrosis/apoptosis induction, ERK/p38 phosphorylation Western blot, migration assays\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization and signaling experiments with multiple readouts, single lab\",\n      \"pmids\": [\"26612514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The K19 residue in HDGF is crucial for heparin binding; H2CN NMR titrations of side-chain resonances (Hε-Cε-Nζ of Lys, Hδ-Cδ-Nε of Arg) revealed that K19 shows the most significant perturbation upon heparin binding, correlated with free energy changes in mutants.\",\n      \"method\": \"H2CN NMR pulse sequence, site-directed mutagenesis, NMR titration experiments\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR with mutagenesis confirming specific residue contributions to heparin binding\",\n      \"pmids\": [\"25117899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Extracellular/recombinant HDGF activates AKT and MAPK signaling pathways in osteosarcoma cells to stimulate proliferation; intrinsic (intracellular) HDGF is also required for osteosarcoma cell proliferation.\",\n      \"method\": \"Recombinant HDGF stimulation, Western blotting for AKT/MAPK phosphorylation, siRNA knockdown, MTT proliferation assay\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — recombinant protein with signaling readout and knockdown, single lab\",\n      \"pmids\": [\"26392778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HDGF activates the STAT3 signaling pathway (specifically STAT3-Tyr705 and STAT3-Ser727 phosphorylation and STAT3 transcriptional activity) to drive radioresistance in breast cancer; RXRα binding to the HDGF promoter blocks HDGF transcriptional activity; TKT was implicated in HDGF-enhanced STAT3 activity.\",\n      \"method\": \"HDGF knockdown, Western blotting for STAT3 phosphorylation, RXRα ChIP on HDGF promoter, in vitro and in vivo radioresistance assays\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — promoter ChIP with signaling readout and functional radioresistance assay, single lab\",\n      \"pmids\": [\"34376200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HDGF induces macrophage polarization toward M2 type through the IL-4/JAK1/STAT3 signaling pathway; HDGF dose-dependently promotes IL-4 expression in NSCLC cells, which in turn drives M2 polarization.\",\n      \"method\": \"Western blotting, qRT-PCR, ELISA, flow cytometry, HDGF overexpression, RNA-seq, in vivo tumor model\",\n      \"journal\": \"Journal of ethnopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA-seq plus multiple functional validation assays, single lab\",\n      \"pmids\": [\"35973634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HDGF-A isoform is located inside exosomes, whereas HDGF-B and HDGF-C isoforms are found exclusively on the outer surface of exosomes; HDGF-A is also found as unbound protein in conditioned media; the N-terminal peptide of HDGF-A determines intra-exosomal localization.\",\n      \"method\": \"Exosome isolation, protease protection assay, Western blotting, fractionation of conditioned media\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — fractionation and protease protection experiments demonstrating differential isoform localization, single lab\",\n      \"pmids\": [\"27926477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FBXW7 (E3 ubiquitin ligase) directly ubiquitinates NAP1L1, promoting its degradation; reduced NAP1L1 impairs recruitment of USP14, decreasing USP14-mediated deubiquitination of HDGF and reducing HDGF protein levels; reduced HDGF in turn suppresses USP14-mediated p62 deubiquitination, promoting autophagy and cisplatin sensitivity in nasopharyngeal carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, deubiquitination assays, knockdown/overexpression experiments, in vivo NPC models\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination/deubiquitination assays with functional rescue in vivo, single lab\",\n      \"pmids\": [\"40414865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IGF2BP2 (m6A reader) binds to and stabilizes HDGF mRNA transcripts in an m6A-dependent manner, promoting HDGF protein expression and ESCC progression.\",\n      \"method\": \"RNA immunoprecipitation, mRNA stability assays, IGF2BP2 overexpression/knockdown, transcriptome sequencing\",\n      \"journal\": \"Journal of cancer research and therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — RIP and mRNA stability with functional validation, single lab\",\n      \"pmids\": [\"39206979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HDGF protects retinal pigment epithelium from ferroptosis via a dual mechanism: activating p38 MAPK/AKT and SIRT1/PGC-1α axes to restore mitochondrial biogenesis, while enhancing the glutathione/GPX4 antioxidant system via the PGC-1α/Nrf2 pathway.\",\n      \"method\": \"Exogenous HDGF treatment, Western blotting, ROS/lipid peroxidation assays, mitochondrial function assays, pathway inhibitor studies\",\n      \"journal\": \"Antioxidants\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple signaling pathway readouts with functional phenotype, single lab\",\n      \"pmids\": [\"41462634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BLM directly interacts with HDGF; HDGF activates KRAS transcription and suppresses RhoA transcription, activating the MAPK/ERK pathway; BLM and HDGF knockdown has synergistic effects on suppressing prostate cancer proliferation and invasion.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, dual-luciferase reporter assay, Western blotting, in vivo xenograft\",\n      \"journal\": \"Journal of cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq and dual-luciferase with Co-IP functional validation, single lab\",\n      \"pmids\": [\"36574142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HDGF knockdown in HCC cells suppresses VEGF expression and reduces in vivo angiogenesis of developed tumors; the anti-tumor effects of HDGF suppression in vivo exceeded the effect predicted from in vitro data alone, implicating angiogenesis as a key effector mechanism.\",\n      \"method\": \"HDGF shRNA stable knockdown, xenograft murine model, real-time PCR and immunostaining for VEGF and angiogenesis markers\",\n      \"journal\": \"Anticancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo knockdown with mechanistic readout (VEGF/angiogenesis), single lab\",\n      \"pmids\": [\"26637859\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HDGF is a multifunctional heparin-binding nuclear protein whose PWWP/HATH domain mediates non-sequence-selective DNA binding and heparin binding (via K19), is internalized through cell-surface heparan sulfates via macropinocytosis, and signals extracellularly through the receptor nucleolin to activate MAPK/ERK, PI3K/AKT, and STAT3 pathways while stimulating mitochondrial ROS generation; intranuclearly, HDGF is transcriptionally repressed by p53 through HDAC-dependent chromatin remodeling, forms complexes with DDX5 and β-catenin to regulate miRNA expression and Wnt/β-catenin signaling, recruits CtIP for homologous recombination DNA repair at H3K36me3-marked loci, interacts with NAP1L1/USP14 in a deubiquitination regulatory axis, and is subject to caspase-dependent dephosphorylation during apoptosis; together these mechanisms underlie HDGF's roles in cell proliferation, angiogenesis (partly via VEGF upregulation), EMT, metastasis, and chemoresistance.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HDGF is a heparin-binding nuclear growth factor that functions both as an intracellular chromatin-associated regulator and as an extracellular signaling molecule, linking transcriptional control, DNA damage repair, and mitogenic signaling to cell proliferation, angiogenesis, and epithelial-mesenchymal transition. Its N-terminal PWWP/HATH domain mediates non-sequence-selective DNA binding, heparin binding (critically dependent on residue K19), RNA association, and protein–protein interactions, while cell-surface heparan sulfates and the receptor nucleolin mediate its internalization via macropinocytosis and activation of MAPK/ERK, PI3K/AKT, and STAT3 signaling cascades [PMID:16384999, PMID:25117899, PMID:20964630, PMID:37827291, PMID:26392778]. In the nucleus, HDGF forms complexes with DDX5 and β-catenin to regulate Wnt/β-catenin–c-Myc signaling and miRNA expression, transcriptionally represses targets such as ALCAM to control Rho-GTPase-dependent cytoskeletal remodeling, activates KRAS transcription, and recruits CtIP to H3K36me3-marked loci to facilitate homologous recombination repair [PMID:28751441, PMID:33239755, PMID:40001585, PMID:36574142]. HDGF expression is transcriptionally repressed by p53 through HDAC-dependent chromatin remodeling and post-transcriptionally stabilized by m6A methylation readers (IGF2BP2) and RNA-binding proteins (G3BP2), while its protein levels are regulated by USP14-mediated deubiquitination downstream of NAP1L1; HDGF-null mice are viable, indicating functional redundancy during normal development [PMID:22006999, PMID:36265285, PMID:40414865, PMID:18570251].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing the baseline expression and subcellular distribution of HDGF across tissues answered where and when this growth factor operates, revealing broad expression with nuclear/cytoplasmic dual localization and developmental regulation in the brain.\",\n      \"evidence\": \"Immunohistochemistry, immunocytochemistry, Western blotting across mouse tissue panels and developmental time points\",\n      \"pmids\": [\"14572309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of developmental regulation demonstrated\", \"Mechanism controlling nuclear vs. cytoplasmic partitioning not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Solving the NMR structure of the PWWP domain and demonstrating its non-sequence-selective DNA-binding activity established the molecular basis for HDGF's chromatin association.\",\n      \"evidence\": \"NMR structure determination, SELEX, and NMR titrations with DNA\",\n      \"pmids\": [\"16384999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No specific genomic target sites identified\", \"Functional consequence of DNA binding on gene regulation not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Generation of HDGF-knockout mice showed the gene is dispensable for normal development, raising the question of whether its growth-factor activities are redundant with HRP family members or context-dependent.\",\n      \"evidence\": \"HDGF-null mice (GFP knock-in) with proliferation, cell-cycle, and apoptosis assays on dermal fibroblasts\",\n      \"pmids\": [\"18570251\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensation by HRP-2/HRP-3 not formally tested\", \"Stress or disease-specific phenotypes not examined in knockout\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating caspase-dependent dephosphorylation of HDGF during apoptosis revealed that HDGF is an early target of the apoptotic signaling cascade, though the kinase/phosphatase pair and functional consequence remain unclear.\",\n      \"evidence\": \"2D phosphoproteomics, mass spectrometry, GFP-HDGF imaging, caspase inhibitor experiments in endothelial cells\",\n      \"pmids\": [\"18465786\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the phosphatase mediating dephosphorylation unknown\", \"Functional impact of dephosphorylation on HDGF activity not determined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying heparan sulfate-dependent macropinocytic internalization and the HATH domain as the entry module resolved how extracellular HDGF re-enters cells and differentially affects MAPK signaling depending on receptor engagement.\",\n      \"evidence\": \"Internalization assays in HS-deficient cells, macropinocytosis inhibitors, K96A mutant, migration/proliferation assays in NIH 3T3 fibroblasts\",\n      \"pmids\": [\"20964630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the cell-surface receptor mediating HS-independent signaling not defined here\", \"Whether macropinocytosis is the sole route of entry in vivo unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Tandem affinity purification revealing 106 HATH-domain-dependent interactors, plus RNA co-immunoprecipitation, expanded HDGF from a simple growth factor to a multifunctional hub in ribosome biogenesis, RNA processing, and DNA repair.\",\n      \"evidence\": \"SBP/Flag tandem affinity purification with LC-MS/MS, Co-IP, RT-PCR SBP-RIP\",\n      \"pmids\": [\"21907836\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most interactors not individually validated by reciprocal methods\", \"RNA targets not identified at sequence level\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that p53 transcriptionally represses HDGF through HDAC-dependent chromatin remodeling established a direct tumor-suppressor–oncoprotein regulatory axis.\",\n      \"evidence\": \"p53 overexpression, HDAC chromatin remodeling assay, neutralizing antibody functional studies\",\n      \"pmids\": [\"22006999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific p53 binding site on HDGF promoter not mapped\", \"Whether other p53 family members also repress HDGF untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Pinpointing K19 as the critical residue for heparin binding by NMR titration of side-chain resonances provided atomic-level understanding of the HDGF–heparan sulfate interaction.\",\n      \"evidence\": \"H2CN NMR pulse sequence with site-directed mutagenesis\",\n      \"pmids\": [\"25117899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural model of full heparin–PWWP complex not determined\", \"In vivo relevance of K19 mutation not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating that HDGF knockdown suppresses VEGF and in vivo angiogenesis in HCC established a mechanistic link between HDGF and tumor vascularization.\",\n      \"evidence\": \"shRNA knockdown, xenograft models, VEGF mRNA/protein quantification\",\n      \"pmids\": [\"26637859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect regulation of VEGF transcription by HDGF not resolved\", \"Whether HDGF signals through autocrine or paracrine VEGF induction unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identifying HDGF as a passively released alarmin from necrotic/apoptotic cells that activates ERK1/2 and p38 MAPK revealed a damage-associated molecular pattern function distinct from its growth-factor role.\",\n      \"evidence\": \"ELISA, cell fractionation, necrosis/apoptosis induction, phospho-Western blotting, migration assays in ovarian cancer cells\",\n      \"pmids\": [\"26612514\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating alarmin signaling not identified in this study\", \"Whether alarmin function operates in non-cancer contexts unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery of the HDGF–DDX5–β-catenin complex and its suppression of miR-296-3p to activate PRKCA-FAK-Ras signaling defined a nuclear transcriptional mechanism linking HDGF to Wnt pathway output and EMT.\",\n      \"evidence\": \"Co-IP with mass spectrometry, GST pull-down, ChIP, EMSA, luciferase reporter assays\",\n      \"pmids\": [\"28751441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly order of the trimeric complex not determined\", \"Whether HDGF DNA-binding activity is required for complex function untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that HDGF isoforms are differentially sorted into or onto exosomes (HDGF-A inside, HDGF-B/C on the surface) revealed an unconventional secretion mechanism with isoform-specific trafficking.\",\n      \"evidence\": \"Exosome isolation, protease protection assay, conditioned media fractionation\",\n      \"pmids\": [\"27926477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of exosomal HDGF delivery on recipient cells not tested\", \"Sorting signal beyond N-terminal peptide not fully defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of a ZEB1→HDGF→β-catenin/TCF4 positive feedback loop driving endometrial cancer metastasis showed how HDGF integrates EMT transcription factor input with Wnt signaling amplification.\",\n      \"evidence\": \"Reciprocal Co-IP, ChIP on HDGF promoter, immunofluorescence, in vitro and in vivo functional assays\",\n      \"pmids\": [\"31815037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the feedback loop operates in normal tissues unknown\", \"Mechanism of HDGF-induced β-catenin nuclear translocation not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"ChIP-seq and functional studies revealing that HDGF transcriptionally represses ALCAM to activate Rac1/Cdc42 and cytoskeletal remodeling defined a nuclear mechanism for HDGF-driven metastasis in Ewing sarcoma.\",\n      \"evidence\": \"ChIP-seq, gene expression profiling, Rac1/Cdc42 activation assays, orthotopic murine models\",\n      \"pmids\": [\"33239755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HDGF directly binds the ALCAM promoter or acts through a co-repressor complex not distinguished\", \"Generalizability to non-Ewing sarcoma contexts untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linking HDGF to STAT3 pathway activation (Tyr705/Ser727 phosphorylation) in radioresistance, with RXRα acting as a transcriptional repressor of HDGF, added a new signaling axis and therapeutic vulnerability.\",\n      \"evidence\": \"HDGF knockdown, STAT3 phosphorylation Western blots, RXRα ChIP on HDGF promoter, in vitro/in vivo radioresistance assays\",\n      \"pmids\": [\"34376200\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HDGF activates STAT3 directly or through an intermediate kinase unresolved\", \"TKT's mechanistic role in HDGF–STAT3 signaling incompletely defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Convergent studies showed NAP1L1 interacts with HDGF to bridge DDX5/β-catenin signaling in colon cancer and c-Jun/CCND1 signaling in glioma, establishing NAP1L1 as a context-dependent upstream scaffold for HDGF oncogenic functions.\",\n      \"evidence\": \"Co-IP, knockdown/overexpression rescue, xenograft models in colon cancer and glioma cells\",\n      \"pmids\": [\"34959221\", \"36148951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface between NAP1L1 and HDGF not mapped\", \"Whether NAP1L1–HDGF interaction is constitutive or signal-regulated unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that m6A modification and RNA-binding proteins (G3BP2, later IGF2BP2) stabilize HDGF mRNA revealed a post-transcriptional regulatory layer controlling HDGF abundance in cancer and macrophage biology.\",\n      \"evidence\": \"Mettl3-dependent m6A assays, mRNA stability assays, RIP, macrophage-specific HDGF KO mice in atherosclerosis models; IGF2BP2 RIP and stability assays in ESCC\",\n      \"pmids\": [\"36265285\", \"34782720\", \"39206979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific m6A sites on HDGF mRNA not mapped at nucleotide resolution in all studies\", \"Relative contribution of transcriptional vs. post-transcriptional regulation in different cell types unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying nucleolin (NCL) as the surface receptor through which extracellular HDGF stimulates mitochondrial ROS and oxidative phosphorylation, with Ser103 required for activity, resolved a long-standing question about the identity of the HDGF receptor.\",\n      \"evidence\": \"Recombinant HDGF, Ser103Ala mutagenesis, Seahorse metabolic flux, NCL knockdown, neutralizing antibody, orthotopic hepatoma model\",\n      \"pmids\": [\"37827291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NCL is the sole HDGF receptor or acts with co-receptors not excluded\", \"Structural basis of HDGF–NCL interaction unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that HDGF recruits CtIP to H3K36me3-marked chromatin to facilitate homologous recombination established HDGF as a reader-effector linking active chromatin marks to DNA damage repair.\",\n      \"evidence\": \"HDGF knockout cells, RNA-seq, Co-IP/interaction assays, drug sensitivity assays in colorectal cancer\",\n      \"pmids\": [\"40001585\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PWWP domain directly reads H3K36me3 in the context of HR repair not formally shown\", \"Structural basis of CtIP recruitment by HDGF not determined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placing HDGF within the FBXW7→NAP1L1→USP14 deubiquitination axis showed that HDGF protein stability is regulated by ubiquitin-dependent proteostasis, connecting HDGF levels to autophagy and chemosensitivity.\",\n      \"evidence\": \"Ubiquitination/deubiquitination assays, Co-IP, knockdown/overexpression, in vivo NPC models\",\n      \"pmids\": [\"40414865\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific ubiquitination sites on HDGF not mapped\", \"Whether other E3 ligases target HDGF directly unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of full-length HDGF in complex with nucleolin, heparan sulfate, or chromatin substrates is lacking, and the relative contributions of intracellular versus extracellular HDGF pools to its diverse signaling outputs remain mechanistically unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No crystal or cryo-EM structure of full-length HDGF or HDGF–NCL complex\", \"Relative physiological importance of intracellular chromatin functions vs. extracellular growth factor signaling undetermined\", \"Functional redundancy with HRP-2 and HRP-3 not systematically dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 10, 16, 26]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10, 26, 9]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [2, 15, 17, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 9, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 11]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [17, 22]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [4, 16]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 15, 19, 20, 25]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 10, 26]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 21]}\n    ],\n    \"complexes\": [\n      \"HDGF–DDX5–β-catenin\",\n      \"HDGF–HRP-2c heteromer\",\n      \"NAP1L1–HDGF–USP14\"\n    ],\n    \"partners\": [\n      \"DDX5\",\n      \"CTNNB1\",\n      \"NCL\",\n      \"NAP1L1\",\n      \"RBBP8\",\n      \"ZEB1\",\n      \"BLM\",\n      \"HDGFL1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}