{"gene":"HMOX1","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2013,"finding":"HO-1 (HMOX1) is an inducible 32-kDa microsomal enzyme that catalyzes the regiospecific oxidative catabolism of heme, producing equimolar amounts of carbon monoxide (CO), ferrous iron (Fe²⁺), and biliverdin. A constitutive isoform HO-2 (36 kDa) also exists but is unresponsive to HO-1 inducers.","method":"Biochemical characterization, pharmacological inhibitor studies","journal":"Current medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — enzymatic activity and catalytic mechanism established across multiple independent laboratories over decades, replicated extensively","pmids":["23746277"],"is_preprint":false},{"year":2009,"finding":"In myeloid cells, HO-1 forms a protein complex with the transcription factor IRF3 and is required for IRF3 phosphorylation and subsequent type-I interferon and chemokine gene induction (TLR3/TLR4/RIG-I pathway). Myeloid HO-1-deficient mice show reduced expression of IRF3 target genes, revealing a non-enzymatic, scaffold-like function of HO-1 in innate immune signaling.","method":"Co-immunoprecipitation (complex formation), myeloid-specific HO-1 knockout mice, gene expression analysis","journal":"Advances in experimental medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and genetic KO with defined phenotype, but single laboratory report","pmids":["21842368"],"is_preprint":false},{"year":2017,"finding":"Cardiomyocyte-specific Hmox1 knockout (HO-1[CM]-/-) mice exposed to oxidative stress (hyperoxia) showed suppression of the Pgc-1α/NRF-1 axis, impaired LC3II processing, failure to upregulate Pink1- and Park2-mediated mitophagy, mitochondrial swelling, cardiomyocyte death, and cardiomyopathy. HO-1 thus regulates genetic programs for mitochondrial quality control (autophagy/mitophagy) downstream of NRF-1 binding to Pink1 and Park2 promoters.","method":"Conditional cardiomyocyte-specific Hmox1 knockout mice, electron microscopy, LC3II/p62 immunoblotting, NRF-1 promoter binding analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean tissue-specific KO with multiple orthogonal readouts (EM, biochemical, promoter binding), mechanistic pathway defined","pmids":["28194437"],"is_preprint":false},{"year":2019,"finding":"Astrocyte-specific overexpression of human HMOX1 (GFAP.HMOX1 transgenic mice) promotes α-synuclein overproduction by downmodulating miR-153 and miR-223, two microRNAs that negatively regulate α-synuclein. Co-culture of wild-type neurons with GFAP.HMOX1 astrocytes caused enhanced protein oxidation, mitophagy, apoptosis, and dopaminergic gene dysregulation; siRNA knockdown of α-synuclein partially abrogated these effects.","method":"Transgenic mouse model, miRNA profiling, siRNA knockdown, neuron-astrocyte co-culture, Western blot, gene expression analysis","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic OE model with multiple readouts and mechanistic rescue by siRNA, single laboratory","pmids":["31180611"],"is_preprint":false},{"year":2019,"finding":"Glial astrocytic HO-1 up-regulation causes accumulation of non-transferrin iron in the mitochondrial compartment, promotes intracellular oxidative stress, opening of the mitochondrial permeability transition pore, and renders co-cultured neuron-like PC12 cells prone to oxidative injury.","method":"Transient transfection overexpression of HO-1 in astrocytes, mitochondrial iron measurement, mitochondrial permeability transition assay, co-culture neurotoxicity assay","journal":"Current Alzheimer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based gain-of-function with mechanistic readouts (mitochondrial iron, MTP pore), single laboratory","pmids":["19874266"],"is_preprint":false},{"year":2015,"finding":"Progesterone acts as an upstream modulator of placental Hmox1 expression; gestational stress reduces progesterone levels and increases methylation at distinct regions of the Hmox1 promoter, decreasing Hmox1 expression. Hmox1-deficient mice show reduced CD8+CD122+ tolerogenic T cells, and Hmox1 deficiency worsens fetal-growth restriction, placing HO-1 downstream of progesterone in regulating CD8+ T cell tolerance at the maternal-fetal interface.","method":"Progesterone receptor-deficient mice, Hmox1-deficient mice, promoter methylation analysis, CD8+ T cell depletion, progesterone supplementation rescue","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic KO models (progesterone receptor KO, Hmox1 KO) with mechanistic rescue experiments, multiple orthogonal approaches","pmids":["25774501"],"is_preprint":false},{"year":2022,"finding":"The deubiquitinase USP7 directly binds HO-1 and promotes its deubiquitination and stabilization after oxidative stress (arsenic exposure). HO-1 protein is ubiquitinated at K243 under resting conditions, leading to proteasomal degradation. Upon arsenic exposure, USP7 is itself ubiquitinated at K476, enhancing USP7–HO-1 interaction and HO-1 protein accumulation, thereby attenuating oxidative damage.","method":"Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (K243, K476), USP7 depletion, in vivo tumor growth assay, correlation in human HCC specimens","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical ubiquitination assay with site mutagenesis, reciprocal Co-IP, multiple orthogonal methods in single rigorous study","pmids":["35821281"],"is_preprint":false},{"year":2023,"finding":"USP7 directly binds to HMOX-1, and USP7 overexpression promotes HMOX-1 expression via deubiquitination in a spinal cord injury (SCI) rat model, thereby reducing ferroptosis and alleviating spinal cord damage.","method":"Co-immunoprecipitation, ubiquitination level measurement after USP7 overexpression, in vivo SCI rat model with locomotor scoring and histology","journal":"Neurochemistry international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and deubiquitination assay confirmed in vivo, but single laboratory; replicates finding from PMID 35821281 in a different context","pmids":["37257587"],"is_preprint":false},{"year":2020,"finding":"SIAH2, a RING-domain ubiquitin E3 ligase, mediates proteasome-dependent degradation of HO-1 through direct interaction with HO-1. SIAH2 knockout mice and human cells deleted for SIAH2 show elevated HO-1 protein levels in specific organs (heart, kidney, skeletal muscle), explained both by increased protein stability (SIAH2-HO-1 interaction) and by elevated HMOX1 transcription via NRF2 (itself a SIAH2 target).","method":"SIAH2 knockout mice, SIAH2 CRISPR knockout human cells, co-immunoprecipitation, proteasome inhibitor experiments, RING domain-dependent interaction assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic KO in two systems (mouse and human cells), domain-dependent Co-IP, proteasome degradation assay, multiple orthogonal methods","pmids":["32042051"],"is_preprint":false},{"year":2024,"finding":"Full-length ER-anchored HO-1 disrupts STING polymerization and subsequent COPII-mediated ER-to-Golgi transport, suppressing downstream IFN signaling. Additionally, radiation-induced cleavage of HO-1 generates a fragment that undergoes nuclear translocation, where it interacts with cGAS and inhibits its nuclear export, suppressing cGAMP production and type-I IFN induction. HO-1 thus comprehensively inhibits the cGAS/STING pathway.","method":"Unbiased CRISPR screen, biochemical STING polymerization assay, COPII transport assay, nuclear fractionation showing cleaved HO-1 nuclear localization, cGAS co-immunoprecipitation, cGAMP measurement, in vivo tumor radiotherapy with HO-1 inhibitors","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — unbiased CRISPR screen plus multiple biochemical mechanistic assays (STING polymerization, nuclear translocation, Co-IP with cGAS, cGAMP quantification) in single rigorous study","pmids":["39621310"],"is_preprint":false},{"year":2024,"finding":"HMOX1 interacts directly with lactate dehydrogenase B (LDHB) in foamy macrophages; this interaction enables the mitochondrial protease LONP1 to degrade mitochondrial transcription factor A (TFAM), causing mitochondrial dysfunction and sensitizing cells to ferroptosis. This mechanism operates specifically in TREM2-low foamy macrophages with low oxidative phosphorylation.","method":"Single-cell and bulk RNA sequencing, Co-immunoprecipitation (HMOX1-LDHB interaction), LONP1 inhibitor (bortezomib) rescue, MitoTEMPO treatment, mouse atherosclerosis model","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP defining HMOX1-LDHB complex, mechanistic pathway rescue experiments with inhibitors in vivo, multiple orthogonal methods","pmids":["39731912"],"is_preprint":false},{"year":2023,"finding":"The lncRNA RGMB-AS1 interacts with HO-1 (HMOX1) protein and prevents its ubiquitination by the E3 ligase TRC8, thereby stabilizing HMOX1 protein and promoting ferroptosis in NSCLC cells. RGMB-AS1 also independently binds to NAA10 (residues 82–87) to stimulate its acetyltransferase activity.","method":"Co-immunoprecipitation (RGMB-AS1–HMOX1 interaction), TRC8 ubiquitination assay, domain mapping (NAA10 residues 82–87), siRNA knockdown, in vivo xenograft model","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with domain mapping, single laboratory; note this involves a lncRNA but the mechanistic discovery is about HMOX1 protein stabilization","pmids":["38574881"],"is_preprint":false},{"year":2018,"finding":"Heat shock factor 4 (HSF4) directly binds to the heat shock element (HSE) in the HMOX1 promoter (at -389 to -362 bp upstream of the TSS) to activate HMOX1 transcription in human lens epithelial cells. HSF4 siRNA knockdown inhibits HMOX1 expression.","method":"Luciferase reporter assay, promoter deletion/mutation mapping, siRNA knockdown, Western blot and qPCR","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with promoter mapping and siRNA rescue, single laboratory","pmids":["29454088"],"is_preprint":false},{"year":2010,"finding":"EGR-1 (early growth response 1) transcription factor regulates HO-1 expression induced by cigarette smoke. EGR-1 undergoes nuclear localization in lung fibroblasts after CSE exposure, and an EGR-1 binding site in the HO-1 enhancer region is responsible for induction. Egr-1-deficient MEFs show decreased CSE-induced HO-1 expression, and CS-exposed EGR-1 loss-of-function mice show exaggerated lung injury.","method":"Luciferase reporter assay with EGR-1 binding site, Egr-1 knockout MEFs, nuclear localization imaging, in vivo CS exposure model","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus genetic KO validation, single laboratory","pmids":["20417178"],"is_preprint":false},{"year":2011,"finding":"Nrf2 is required for CsA-stimulated HO-1 mRNA expression in human gingival fibroblasts. ERK kinase inhibition reduces CsA-stimulated Nrf2 nuclear translocation and HO-1 mRNA expression. NF-κB inhibition has no effect on CsA-stimulated HO-1, establishing Nrf2 (not NF-κB) as the mediator of CsA-induced HO-1 expression via ERK signaling.","method":"siRNA knockdown of Nrf2, NF-κB inhibitor, ERK kinase inhibitor, nuclear translocation assay, RT-PCR","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus pharmacological inhibitors define pathway, single laboratory","pmids":["21622902"],"is_preprint":false},{"year":2009,"finding":"Iron-mediated upregulation of HMOX1 in hepatoma cells expressing HCV operates through the Nrf2 pathway: Nrf2 siRNA knockdown decreases FeNTA-mediated HMOX1 mRNA upregulation. Iron does not affect Bach1 (a repressor of HMOX1) mRNA or protein levels, distinguishing iron-Nrf2 from iron-Bach1 mechanisms in this context.","method":"Nrf2 siRNA knockdown, Western blot, qRT-PCR, deferoxamine inhibition","journal":"World journal of gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA mechanistic dissection with pharmacological controls, single laboratory","pmids":["19777608"],"is_preprint":false},{"year":2023,"finding":"HMOX1 promotes ferroptosis by catalyzing heme degradation to release Fe²⁺ (ferrous iron). In human lens epithelial cells (HLECs) and cisplatin-resistant ovarian cancer cells, forced HMOX1 overexpression increases intracellular Fe²⁺ and lipid peroxidation and sensitizes cells to ferroptosis, while HMOX1 knockout/knockdown reduces Fe²⁺ and attenuates ferroptosis. This identifies HMOX1 as a pro-ferroptotic enzyme through its iron-liberating catalytic activity.","method":"CRISPR-Cas9 HMOX1 knockout, lentiviral overexpression, siRNA knockdown, ferrous/ferric iron measurement, lipid peroxidation assay (MDA), cell viability","journal":"Current eye research; Phytomedicine","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple independent laboratories using gain- and loss-of-function with direct iron measurement confirm HMOX1 enzymatic activity as mechanistic driver of Fe²⁺ accumulation and ferroptosis","pmids":["36300537","36773431"],"is_preprint":false},{"year":2024,"finding":"P300 (histone acetyltransferase) normally interacts with HIF-1α to suppress HMOX1 expression. When P300 expression is reduced by ferroptosis inducers, HIF-1α preferentially binds P53 instead, driving HMOX1 overexpression and promoting VSMC ferroptosis. Co-immunoprecipitation confirmed competitive binding of P300 and P53 to HIF-1α.","method":"Co-immunoprecipitation (P300–HIF-1α and HIF-1α–P53 interactions), shRNA knockdown, specific inhibitor A-485, HIF-1α inhibitor BAY87-2243 rescue, lipid peroxidation assay","journal":"Molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP defines competitive binding and pathway, multiple knockdown and inhibitor rescue experiments, single laboratory","pmids":["37415103"],"is_preprint":false},{"year":2023,"finding":"Ythdf2 (an m6A reader protein) promotes degradation of Hmox1 mRNA in an m6A-dependent manner in alveolar macrophages. Myeloid-specific Ythdf2 knockout results in elevated Hmox1 mRNA and protein, attenuated macrophage polarization and oxidative stress, and protection from pulmonary hypertension. Pharmacological inhibition of Hmox1 reversed the protective phenotype of Ythdf2 knockout mice.","method":"Myeloid-specific Ythdf2 knockout mice, m6A-dependent mRNA stability assay, Hmox1 inhibitor rescue, right ventricular hypertrophy and pulmonary vascular remodeling readouts","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with mechanistic mRNA degradation assay and pharmacological rescue, single laboratory","pmids":["36801705"],"is_preprint":false},{"year":2024,"finding":"The histone acetyltransferase Kat2a promotes ferroptosis in diabetic cardiomyopathy by increasing H3K27ac and H3K9ac enrichment on the promoter regions of Tfrc and Hmox1, thereby enhancing their transcription. This Kat2a-driven upregulation of Hmox1 (and Tfrc) increases iron availability and promotes ferroptosis.","method":"ChIP assay (H3K27ac and H3K9ac enrichment on Hmox1 promoter), Kat2a inhibition/overexpression, in vitro high-glucose cardiomyocyte model, in vivo DCM model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP defines direct epigenetic activation of Hmox1 promoter with functional ferroptosis readout, single laboratory","pmids":["38858351"],"is_preprint":false},{"year":2018,"finding":"Scavenging of hemoglobin:haptoglobin complexes via CD163 receptor on macrophages leads to nuclear translocation of Nrf2, upregulation of HO-1, and release of IL-10. This CD163-Nrf2-HO-1-IL-10 axis mediates M1-to-M2 macrophage switching, and IL-10 feeds back to further upregulate CD163.","method":"Macrophage receptor (CD163) signaling experiments, Nrf2 nuclear translocation assay, hemin activation in rodent diabetes models, Hp2 polymorphism association studies","journal":"Current pharmaceutical design","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway defined by multiple experimental approaches including receptor-mediated signaling and in vivo models, but review paper citing multiple studies","pmids":["30014796"],"is_preprint":false},{"year":2018,"finding":"Mkp-1 (mitogen-activated protein kinase phosphatase 1) directly interacts with the DIDLID motif of Nrf2, increasing Nrf2 stability and positively regulating HO-1 expression. Conversely, Nrf2 activates Mkp-1 transcription via antioxidant response elements (AREs) in the Mkp-1 promoter. Mkp-1-/- mice show increased susceptibility to DSS-induced colitis.","method":"Co-immunoprecipitation (Mkp-1–Nrf2 DIDLID motif interaction), Mkp-1 knockout mice, ARE-driven luciferase reporter assay, siRNA, Western blot","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein interaction defined by Co-IP with domain mapping, genetic KO mice, reporter assay; single laboratory","pmids":["30061089"],"is_preprint":false},{"year":2021,"finding":"HO-1 induction in cardiomyocytes during hypoxia/reoxygenation (H/R) injury promotes autophagy (increased LC3II, decreased p62) and protects mitochondrial membrane potential and reduces mitochondrial ROS. HO-1 overexpression (Lv-HO1-H9c2 cell line) enhances autophagic flux, while HO-1 inhibition with ZnPP suppresses autophagy and worsens mitochondrial dysfunction.","method":"Lentiviral HO-1 overexpression, HO-1 inhibitor (ZnPP), LC3II/p62 Western blot, RFP-GFP-LC3 double-label adenovirus confocal microscopy, JC-1 mitochondrial membrane potential assay, flow cytometry","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with multiple orthogonal autophagy/mitochondrial readouts, single laboratory","pmids":["27138700"],"is_preprint":false},{"year":2024,"finding":"PTGDS (prostaglandin D2 synthase) interacts with HMOX1 protein, and targeting PTGDS increases intracellular iron levels and induces ferroptosis through promoting HMOX1-mediated heme catabolism and ferritin autophagy. An H25A mutation in HMOX1 was identified as the key functional residue for this PTGDS-dependent ferroptotic role.","method":"Co-immunoprecipitation (PTGDS–HMOX1), TMT mass spectrometry, RNA-seq, site-directed mutagenesis (H25A), lentiviral gene silencing, xenograft model","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus site mutagenesis identifying functional residue, in vivo validation; single laboratory","pmids":["39706989"],"is_preprint":false},{"year":2016,"finding":"Nrf2 binds to ARE sequences in the promoter regions of HO-1 (HMOX1), GCLM, and x-CT target genes in neuroblastoma cells treated with bortezomib, driving their transcription. HO-1 silencing combined with GSH depletion synergistically decreases cell viability in bortezomib-treated cells, demonstrating that HO-1 contributes to Nrf2-mediated chemoresistance.","method":"Nrf2 ChIP/ARE binding assay, HO-1 siRNA silencing, pharmacological GSH depletion, cell viability assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ARE binding assay plus functional siRNA rescue, single laboratory","pmids":["27023064"],"is_preprint":false},{"year":2024,"finding":"IFI16 activates HMOX1 transcription by interacting with the transcription factors JUND and SP1 through its pyrin domain, thereby robustly facilitating HMOX1 expression. Elevated HMOX1 attenuates ferroptosis (reduced lipid peroxidation, ROS, and Fe²⁺) after irradiation, enhancing radioresistance in glioblastoma. The compound glyburide disrupts IFI16 function and reduces HMOX1 expression, restoring radiosensitivity.","method":"Co-immunoprecipitation (IFI16–JUND, IFI16–SP1 via pyrin domain), CRISPR/IFI16 manipulation, HMOX1 reporter/ChIP, radioresistant GBM cell model, ferroptosis assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with domain mapping (pyrin domain), transcription factor complex, functional rescue, in vivo validation; multiple orthogonal methods in single rigorous study","pmids":["39890789"],"is_preprint":false},{"year":2025,"finding":"FOSL1 (a transcription factor) transcriptionally activates HMOX1 by binding to its promoter. Juglone increases FOSL1 and HMOX1 expression, driving ferroptosis in HCC cells; HMOX1 silencing attenuates juglone-induced ferroptosis. Dual-luciferase reporter assay identified the specific FOSL1 binding site in the HMOX1 promoter.","method":"Dual-luciferase reporter assay with HMOX1 promoter, gene silencing (HMOX1 siRNA), RNA-seq and proteomics, xenograft model","journal":"Phytomedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay identifies binding site, siRNA rescue confirms functional role, single laboratory","pmids":["39923427"],"is_preprint":false},{"year":2004,"finding":"Prolactin (PRL) increases HO-1 expression and protein synthesis in human macrophages in a time- and dose-dependent manner, and PRL-treated macrophages show enhanced VEGF release. HO-1 activity is required for PRL-induced VEGF production, as demonstrated using the HO inducer SnCl₂ and the HO inhibitor SnMP.","method":"RT-real-time PCR, Western blot, ELISA for VEGF, pharmacological HO-1 inducer (SnCl₂) and inhibitor (SnMP) experiments","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological gain- and loss-of-function with multiple readouts, but no direct binding assay; consistent with established HO-1 biology","pmids":["15352176"],"is_preprint":false},{"year":2015,"finding":"HO-1 induction in microglia (not astrocytes) mediates curcumin's glioprotective and anti-inflammatory effects. Glial cultures from LysM(Cre) Hmox(Δ/Δ) microglial-specific HO-1 knockout mice lose curcumin's protective effect. HO-1 inhibitor SnPP blocks curcumin-afforded ROS reduction and cell protection, and HO-1 promotes microglial ramified anti-inflammatory morphology in an HO-1-dependent manner.","method":"Myeloid-specific HO-1 conditional knockout (LysM(Cre) Hmox(Δ/Δ)), SnPP HO-1 inhibitor, primary glial cultures, morphological analysis, cytokine measurement","journal":"Molecular nutrition & food research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific genetic KO plus pharmacological inhibitor, mechanistic cellular phenotype, single laboratory","pmids":["26047311"],"is_preprint":false},{"year":2021,"finding":"HO-1 induction in prostate cancer cells (PC3, C4-2B) with hemin impairs cellular metabolic rate, reducing glucose uptake, ATP production, LDH activity, and extracellular lactate, indicating HO-1 modulates aerobic glycolysis through lactate dehydrogenase (LDH).","method":"Pharmacological HO-1 induction (hemin), glucose uptake assay, ATP measurement, LDH activity assay, lactate measurement","journal":"Antioxidants (Basel, Switzerland)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological induction only, no direct binding or genetic KO, single laboratory","pmids":["34208670"],"is_preprint":false},{"year":2024,"finding":"Ginsenoside Rb1 specifically targets HO-1 protein at the K18A residue, as determined by molecular docking, surface plasmon resonance (SPR), and microscale thermophoresis (MST). Rb1 reduces HO-1 expression, inhibits ferroptosis in sepsis-induced organ tissues, and improves sepsis outcomes in vivo.","method":"Molecular docking, surface plasmon resonance, microscale thermophoresis (direct binding assays), HO-1 inhibitor (ZNPP), CLP mouse model, in vitro LPS/THP-1","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — three orthogonal direct binding methods (docking, SPR, MST) identify HO-1 as molecular target with key residue; in vivo validation, single laboratory","pmids":["39510452"],"is_preprint":false},{"year":2021,"finding":"HMOX1 knockdown in human endothelial cells attenuates Fe²⁺ overload, reduces iron content and ROS, alleviates lipid peroxidation, and reduces ferroptosis in a diabetic high-glucose/high-lipid context, demonstrating that HMOX1 upregulation is causally responsible for increased ferroptosis in diabetic atherosclerosis.","method":"siRNA knockdown of HMOX1, ferrostatin-1 ferroptosis inhibitor, Fe²⁺ iron content measurement, ROS detection, lipid peroxidation assay","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with mechanistic iron/ROS readouts in human cells, single laboratory","pmids":["34508760"],"is_preprint":false}],"current_model":"HMOX1 encodes heme oxygenase-1 (HO-1), an inducible 32-kDa microsomal enzyme that catalyzes the rate-limiting oxidative degradation of heme to carbon monoxide (CO), ferrous iron (Fe²⁺), and biliverdin; it is transcriptionally activated primarily by Nrf2 (via ARE elements), with additional regulation by EGR-1, HSF4, FOSL1, IFI16/JUND/SP1 complexes, progesterone, and epigenetic modifiers (Kat2a, histone lactylation); post-translationally, HO-1 protein stability is controlled by SIAH2-mediated ubiquitination at K243 and counteracted by USP7-mediated deubiquitination; beyond its catalytic role, HO-1 exerts non-enzymatic functions including scaffolding IRF3 phosphorylation in innate immune signaling, disrupting STING polymerization and cGAS nuclear export to suppress the cGAS/STING/IFN-I pathway, regulating mitochondrial quality control via the NRF-1/Pink1/Parkin axis, and interacting with LDHB to drive LONP1-mediated TFAM degradation leading to mitochondrial dysfunction and ferroptosis; through its Fe²⁺-liberating catalytic activity, HO-1 can be pro-ferroptotic (promoting iron-dependent lipid peroxidation) or cytoprotective depending on cellular context, and its mRNA stability is negatively regulated by the m6A reader YTHDF2."},"narrative":{"mechanistic_narrative":"HMOX1 encodes the inducible 32-kDa microsomal enzyme heme oxygenase-1 (HO-1), which catalyzes the regiospecific oxidative degradation of heme to carbon monoxide, ferrous iron (Fe²⁺), and biliverdin, distinguishing it from the constitutive, inducer-unresponsive HO-2 isoform [PMID:23746277]. HMOX1 transcription is a major node of stress-responsive gene regulation: the antioxidant pathway transcription factor Nrf2 binds ARE elements in the HMOX1 promoter to drive its induction [PMID:27023064], with Nrf2 activity itself tuned by upstream signaling and stabilizing partners including ERK signaling [PMID:21622902], Mkp-1 [PMID:30061089], and SIAH2 [PMID:32042051], and by CD163-mediated hemoglobin scavenging in macrophages [PMID:30014796]. Additional sequence-specific activators converge on the promoter and enhancer, including EGR-1 during cigarette-smoke exposure [PMID:20417178], HSF4 in lens epithelium [PMID:29454088], FOSL1 [PMID:39923427], an IFI16–JUND–SP1 complex acting through the IFI16 pyrin domain [PMID:39890789], and a HIF-1α/P53 versus HIF-1α/P300 competitive switch [PMID:37415103]; epigenetic and post-transcriptional layers add Kat2a-driven histone acetylation at the promoter [PMID:30014796, PMID:38858351] and YTHDF2-mediated m6A-dependent decay of Hmox1 mRNA [PMID:36801705]. At the protein level, HO-1 abundance is set by ubiquitin-dependent turnover: SIAH2 directs proteasomal degradation [PMID:32042051], the K243-linked ubiquitinated pool is reversed by USP7-mediated deubiquitination and stabilization under oxidative stress [PMID:35821281, PMID:37257587], and the lncRNA RGMB-AS1 shields HO-1 from TRC8-mediated ubiquitination [PMID:38574881]. Through its Fe²⁺-liberating catalytic activity HO-1 is a central determinant of ferroptosis, where forced expression raises intracellular Fe²⁺ and lipid peroxidation and knockdown attenuates iron-dependent cell death across diverse cell types [PMID:36300537, PMID:36773431, PMID:34508760]. HO-1 also performs catalysis-independent functions: it scaffolds IRF3 phosphorylation in innate immune signaling [PMID:21842368], and ER-anchored full-length HO-1 disrupts STING polymerization while a cleaved nuclear fragment binds cGAS to suppress its export and cGAMP production, broadly inhibiting the cGAS/STING type-I interferon pathway [PMID:39621310]. In addition, HO-1 governs mitochondrial quality control via an Nrf-1/Pink1/Parkin mitophagy program [PMID:28194437] and, through direct interaction with LDHB, enables LONP1-mediated TFAM degradation driving mitochondrial dysfunction and ferroptosis in foamy macrophages [PMID:39731912]. A transgenic study links astrocytic HMOX1 overexpression to α-synuclein accumulation and dopaminergic dysfunction [PMID:31180611].","teleology":[{"year":2004,"claim":"Established that HO-1 activity is functionally required downstream of a physiological stimulus, showing prolactin-induced VEGF release in macrophages depends on HO activity.","evidence":"Pharmacological HO inducer/inhibitor and VEGF ELISA in human macrophages","pmids":["15352176"],"confidence":"Medium","gaps":["No direct binding or genetic evidence linking HO-1 to VEGF machinery","Mechanism connecting CO/biliverdin to VEGF unresolved"]},{"year":2009,"claim":"Revealed a non-enzymatic scaffold function: HO-1 complexes with IRF3 and is required for its phosphorylation and type-I interferon induction in myeloid cells.","evidence":"Co-IP and myeloid-specific Hmox1 knockout mice with gene expression readouts","pmids":["21842368"],"confidence":"Medium","gaps":["Structural basis of HO-1–IRF3 interaction undefined","Single-laboratory report","Relationship between scaffold and catalytic roles unresolved"]},{"year":2009,"claim":"Distinguished iron-induced HMOX1 upregulation as Nrf2-dependent rather than Bach1-dependent, refining the regulatory logic of iron sensing.","evidence":"Nrf2 siRNA knockdown and deferoxamine controls in HCV-expressing hepatoma cells","pmids":["19777608"],"confidence":"Medium","gaps":["Direct ARE occupancy not measured in this context","Single laboratory"]},{"year":2010,"claim":"Identified EGR-1 as a context-specific activator of HO-1 in cigarette-smoke responses, broadening the transcription factor repertoire beyond Nrf2.","evidence":"Reporter assay with EGR-1 binding site, Egr-1 knockout MEFs, in vivo CS exposure","pmids":["20417178"],"confidence":"Medium","gaps":["Interplay between EGR-1 and Nrf2 at the locus undefined","Single laboratory"]},{"year":2015,"claim":"Placed HO-1 downstream of progesterone in maternal-fetal immune tolerance, linking promoter methylation to CD8+ T cell tolerance and fetal growth.","evidence":"Progesterone receptor and Hmox1 knockout mice, promoter methylation, progesterone rescue","pmids":["25774501"],"confidence":"High","gaps":["Molecular link between HO-1 products and tolerogenic T cell induction unresolved","Specific methyltransferase not identified"]},{"year":2016,"claim":"Demonstrated HO-1 is a direct Nrf2/ARE target gene contributing to a coordinated antioxidant transcriptional program and chemoresistance.","evidence":"Nrf2 ARE ChIP/binding assay and HO-1 siLencing with GSH depletion in neuroblastoma","pmids":["27023064"],"confidence":"Medium","gaps":["Relative contribution of HO-1 versus other Nrf2 targets unresolved","Single laboratory"]},{"year":2017,"claim":"Defined a cytoprotective role for HO-1 in mitochondrial quality control, acting through the Pgc-1α/NRF-1 axis to enable Pink1/Park2-mediated mitophagy.","evidence":"Cardiomyocyte-specific Hmox1 knockout, EM, LC3II immunoblotting, NRF-1 promoter binding","pmids":["28194437"],"confidence":"High","gaps":["Whether the effect requires catalysis versus protein function not separated","Direct HO-1 input to NRF-1 unresolved"]},{"year":2018,"claim":"Expanded the activating transcription factor set with HSF4 binding a defined HSE in the HMOX1 promoter in lens epithelium.","evidence":"Luciferase reporter with promoter mapping and HSF4 siRNA knockdown","pmids":["29454088"],"confidence":"Medium","gaps":["In vivo relevance not tested","Single laboratory"]},{"year":2018,"claim":"Established positive feedback regulators of the Nrf2-HO-1 axis (Mkp-1 stabilizing Nrf2; CD163-Nrf2-HO-1-IL-10 macrophage switching), explaining amplification of HO-1 induction.","evidence":"Co-IP with DIDLID motif mapping and Mkp-1 KO mice; CD163 receptor signaling and Nrf2 translocation in macrophages","pmids":["30061089","30014796"],"confidence":"Medium","gaps":["CD163 axis derived partly from review-level synthesis","Direct HO-1 promoter occupancy by these factors not the focus"]},{"year":2019,"claim":"Linked astrocytic HMOX1 overexpression to neurodegenerative pathology via miR-153/miR-223 downregulation and α-synuclein accumulation, and to mitochondrial iron-driven oxidative injury.","evidence":"GFAP.HMOX1 transgenic mice, miRNA profiling, α-synuclein siRNA rescue, neuron-astrocyte co-culture; HO-1 overexpression with mitochondrial iron and MPT pore assays","pmids":["31180611","19874266"],"confidence":"Medium","gaps":["Overexpression models may not reflect endogenous levels","Mechanism linking HO-1 to specific miRNAs undefined"]},{"year":2020,"claim":"Identified SIAH2 as the E3 ligase driving proteasomal HO-1 degradation, with a dual effect via direct degradation and Nrf2-mediated transcription.","evidence":"SIAH2 KO mice and CRISPR human cells, RING-dependent Co-IP, proteasome inhibitor experiments","pmids":["32042051"],"confidence":"High","gaps":["Specific HO-1 ubiquitination site by SIAH2 not pinpointed here","Tissue selectivity of the effect unexplained"]},{"year":2022,"claim":"Defined the deubiquitination arm of HO-1 stability control, showing USP7 binds HO-1 and reverses K243 ubiquitination to stabilize it under oxidative stress.","evidence":"Co-IP, ubiquitination assay with K243/K476 site mutagenesis, USP7 depletion, in vivo tumor and HCC specimen correlation","pmids":["35821281"],"confidence":"High","gaps":["Whether USP7 antagonizes SIAH2 directly not tested","Trigger for USP7 K476 ubiquitination unresolved"]},{"year":2023,"claim":"Established HO-1 catalytic activity as a direct pro-ferroptotic driver through Fe²⁺ liberation, generalizing across multiple cell types and disease contexts.","evidence":"CRISPR knockout, overexpression, siRNA with direct Fe²⁺ and lipid peroxidation measurement in lens, ovarian cancer, and endothelial cells","pmids":["36300537","36773431","34508760"],"confidence":"High","gaps":["Determinants of pro-ferroptotic versus cytoprotective outcome incompletely defined","Downstream lipid peroxidation effectors not mapped"]},{"year":2023,"claim":"Added post-transcriptional and replicated post-translational stability controls: YTHDF2-driven m6A decay of Hmox1 mRNA and a second USP7-HMOX1 stabilization context.","evidence":"Myeloid Ythdf2 KO with mRNA stability assay and Hmox1 inhibitor rescue; Co-IP and deubiquitination in SCI rat model","pmids":["36801705","37257587"],"confidence":"Medium","gaps":["m6A sites on Hmox1 transcript not mapped","Generalizability of USP7 axis across tissues partial"]},{"year":2024,"claim":"Uncovered comprehensive catalysis-independent suppression of innate immunity by HO-1, both blocking STING polymerization/ER-to-Golgi transport and, as a cleaved nuclear fragment, inhibiting cGAS nuclear export.","evidence":"Unbiased CRISPR screen, STING polymerization and COPII transport assays, nuclear fractionation, cGAS Co-IP, cGAMP quantification, in vivo radiotherapy","pmids":["39621310"],"confidence":"High","gaps":["Protease generating the cleaved HO-1 fragment not identified","Balance between enzymatic and immune-suppressive roles unresolved"]},{"year":2024,"claim":"Defined a direct HMOX1-LDHB interaction that couples HO-1 to mitochondrial dysfunction via LONP1-mediated TFAM degradation in foamy macrophages.","evidence":"scRNA/bulk RNA-seq, reciprocal Co-IP, LONP1 inhibitor and MitoTEMPO rescue, mouse atherosclerosis model","pmids":["39731912"],"confidence":"High","gaps":["Structural interface of HMOX1-LDHB undefined","Whether catalysis is required for the interaction unresolved"]},{"year":2024,"claim":"Mapped additional transcriptional and protein-interaction control nodes: an IFI16-JUND-SP1 activating complex, FOSL1 promoter binding, HIF-1α/P53 versus P300 switching, Kat2a histone acetylation, PTGDS interaction, and a druggable HO-1 protein interface (H25A/K18A residues).","evidence":"Co-IP with domain mapping, ChIP, reporter assays, site-directed mutagenesis, SPR/MST binding, xenograft and disease models","pmids":["39890789","39923427","37415103","38858351","39706989","39510452","38574881"],"confidence":"Medium","gaps":["Each regulator largely single-laboratory and context-specific","Integration of these inputs into one regulatory hierarchy unresolved"]},{"year":null,"claim":"How the catalytic (Fe²⁺-liberating, pro-ferroptotic) and non-enzymatic (immune-suppressive, scaffold, mitochondrial) functions of HO-1 are switched within a single cell, and what determines the cytoprotective versus cytotoxic balance, remains unresolved.","evidence":"No single study in the corpus reconciles enzymatic and non-enzymatic outputs mechanistically","pmids":[],"confidence":"Low","gaps":["No unified model of catalytic versus scaffold function","Determinants of context-dependent ferroptotic outcome undefined","Protease and signals controlling HO-1 cleavage/subcellular partitioning unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,9,10]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[16,31,10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,9,20]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[24,6,2]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[2,22]}],"complexes":[],"partners":["IRF3","USP7","SIAH2","LDHB","CGAS","STING","PTGDS","TRC8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P09601","full_name":"Heme oxygenase 1","aliases":[],"length_aa":288,"mass_kda":32.8,"function":"Catalyzes the oxidative cleavage of heme at the alpha-methene bridge carbon, released as carbon monoxide (CO), to generate biliverdin IXalpha, while releasing the central heme iron chelate as ferrous iron (PubMed:11121422, PubMed:19556236, PubMed:7703255). Affords protection against programmed cell death and this cytoprotective effect relies on its ability to catabolize free heme and prevent it from sensitizing cells to undergo apoptosis (PubMed:20055707) (Microbial infection) During SARS-COV-2 infection, promotes SARS-CoV-2 ORF3A-mediated autophagy but is unlikely to be required for ORF3A-mediated induction of reticulophagy Catalyzes the oxidative cleavage of heme at the alpha-methene bridge carbon, released as carbon monoxide (CO), to generate biliverdin IXalpha, while releasing the central heme iron chelate as ferrous iron","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/P09601/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HMOX1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CCDC47","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HMOX1","total_profiled":1310},"omim":[{"mim_id":"619730","title":"ACTIN-RELATED PROTEIN 5; ACTR5","url":"https://www.omim.org/entry/619730"},{"mim_id":"619716","title":"ACTIN-RELATED PROTEIN 8; ACTR8","url":"https://www.omim.org/entry/619716"},{"mim_id":"617717","title":"AUDITORY NEUROPATHY AND OPTIC ATROPHY; ANOA","url":"https://www.omim.org/entry/617717"},{"mim_id":"614034","title":"HEME OXYGENASE 1 DEFICIENCY; HMOX1D","url":"https://www.omim.org/entry/614034"},{"mim_id":"613381","title":"CYSTATHIONINE BETA-SYNTHASE; CBS","url":"https://www.omim.org/entry/613381"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Golgi apparatus","reliability":"Uncertain"},{"location":"Plasma membrane","reliability":"Uncertain"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":740.2}],"url":"https://www.proteinatlas.org/search/HMOX1"},"hgnc":{"alias_symbol":["bK286B10","HO-1"],"prev_symbol":[]},"alphafold":{"accession":"P09601","domains":[{"cath_id":"1.20.910.10","chopping":"12-224","consensus_level":"high","plddt":96.9329,"start":12,"end":224}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P09601","model_url":"https://alphafold.ebi.ac.uk/files/AF-P09601-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P09601-F1-predicted_aligned_error_v6.png","plddt_mean":82.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HMOX1","jax_strain_url":"https://www.jax.org/strain/search?query=HMOX1"},"sequence":{"accession":"P09601","fasta_url":"https://rest.uniprot.org/uniprotkb/P09601.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P09601/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P09601"}},"corpus_meta":[{"pmid":"35646542","id":"PMC_35646542","title":"Celastrol induces ferroptosis in activated HSCs to ameliorate hepatic fibrosis via targeting peroxiredoxins and HO-1.","date":"2021","source":"Acta pharmaceutica Sinica. 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A constitutive isoform HO-2 (36 kDa) also exists but is unresponsive to HO-1 inducers.\",\n      \"method\": \"Biochemical characterization, pharmacological inhibitor studies\",\n      \"journal\": \"Current medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — enzymatic activity and catalytic mechanism established across multiple independent laboratories over decades, replicated extensively\",\n      \"pmids\": [\"23746277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In myeloid cells, HO-1 forms a protein complex with the transcription factor IRF3 and is required for IRF3 phosphorylation and subsequent type-I interferon and chemokine gene induction (TLR3/TLR4/RIG-I pathway). Myeloid HO-1-deficient mice show reduced expression of IRF3 target genes, revealing a non-enzymatic, scaffold-like function of HO-1 in innate immune signaling.\",\n      \"method\": \"Co-immunoprecipitation (complex formation), myeloid-specific HO-1 knockout mice, gene expression analysis\",\n      \"journal\": \"Advances in experimental medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and genetic KO with defined phenotype, but single laboratory report\",\n      \"pmids\": [\"21842368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cardiomyocyte-specific Hmox1 knockout (HO-1[CM]-/-) mice exposed to oxidative stress (hyperoxia) showed suppression of the Pgc-1α/NRF-1 axis, impaired LC3II processing, failure to upregulate Pink1- and Park2-mediated mitophagy, mitochondrial swelling, cardiomyocyte death, and cardiomyopathy. HO-1 thus regulates genetic programs for mitochondrial quality control (autophagy/mitophagy) downstream of NRF-1 binding to Pink1 and Park2 promoters.\",\n      \"method\": \"Conditional cardiomyocyte-specific Hmox1 knockout mice, electron microscopy, LC3II/p62 immunoblotting, NRF-1 promoter binding analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean tissue-specific KO with multiple orthogonal readouts (EM, biochemical, promoter binding), mechanistic pathway defined\",\n      \"pmids\": [\"28194437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Astrocyte-specific overexpression of human HMOX1 (GFAP.HMOX1 transgenic mice) promotes α-synuclein overproduction by downmodulating miR-153 and miR-223, two microRNAs that negatively regulate α-synuclein. Co-culture of wild-type neurons with GFAP.HMOX1 astrocytes caused enhanced protein oxidation, mitophagy, apoptosis, and dopaminergic gene dysregulation; siRNA knockdown of α-synuclein partially abrogated these effects.\",\n      \"method\": \"Transgenic mouse model, miRNA profiling, siRNA knockdown, neuron-astrocyte co-culture, Western blot, gene expression analysis\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic OE model with multiple readouts and mechanistic rescue by siRNA, single laboratory\",\n      \"pmids\": [\"31180611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Glial astrocytic HO-1 up-regulation causes accumulation of non-transferrin iron in the mitochondrial compartment, promotes intracellular oxidative stress, opening of the mitochondrial permeability transition pore, and renders co-cultured neuron-like PC12 cells prone to oxidative injury.\",\n      \"method\": \"Transient transfection overexpression of HO-1 in astrocytes, mitochondrial iron measurement, mitochondrial permeability transition assay, co-culture neurotoxicity assay\",\n      \"journal\": \"Current Alzheimer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based gain-of-function with mechanistic readouts (mitochondrial iron, MTP pore), single laboratory\",\n      \"pmids\": [\"19874266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Progesterone acts as an upstream modulator of placental Hmox1 expression; gestational stress reduces progesterone levels and increases methylation at distinct regions of the Hmox1 promoter, decreasing Hmox1 expression. Hmox1-deficient mice show reduced CD8+CD122+ tolerogenic T cells, and Hmox1 deficiency worsens fetal-growth restriction, placing HO-1 downstream of progesterone in regulating CD8+ T cell tolerance at the maternal-fetal interface.\",\n      \"method\": \"Progesterone receptor-deficient mice, Hmox1-deficient mice, promoter methylation analysis, CD8+ T cell depletion, progesterone supplementation rescue\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic KO models (progesterone receptor KO, Hmox1 KO) with mechanistic rescue experiments, multiple orthogonal approaches\",\n      \"pmids\": [\"25774501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The deubiquitinase USP7 directly binds HO-1 and promotes its deubiquitination and stabilization after oxidative stress (arsenic exposure). HO-1 protein is ubiquitinated at K243 under resting conditions, leading to proteasomal degradation. Upon arsenic exposure, USP7 is itself ubiquitinated at K476, enhancing USP7–HO-1 interaction and HO-1 protein accumulation, thereby attenuating oxidative damage.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (K243, K476), USP7 depletion, in vivo tumor growth assay, correlation in human HCC specimens\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical ubiquitination assay with site mutagenesis, reciprocal Co-IP, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"35821281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP7 directly binds to HMOX-1, and USP7 overexpression promotes HMOX-1 expression via deubiquitination in a spinal cord injury (SCI) rat model, thereby reducing ferroptosis and alleviating spinal cord damage.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination level measurement after USP7 overexpression, in vivo SCI rat model with locomotor scoring and histology\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and deubiquitination assay confirmed in vivo, but single laboratory; replicates finding from PMID 35821281 in a different context\",\n      \"pmids\": [\"37257587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIAH2, a RING-domain ubiquitin E3 ligase, mediates proteasome-dependent degradation of HO-1 through direct interaction with HO-1. SIAH2 knockout mice and human cells deleted for SIAH2 show elevated HO-1 protein levels in specific organs (heart, kidney, skeletal muscle), explained both by increased protein stability (SIAH2-HO-1 interaction) and by elevated HMOX1 transcription via NRF2 (itself a SIAH2 target).\",\n      \"method\": \"SIAH2 knockout mice, SIAH2 CRISPR knockout human cells, co-immunoprecipitation, proteasome inhibitor experiments, RING domain-dependent interaction assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic KO in two systems (mouse and human cells), domain-dependent Co-IP, proteasome degradation assay, multiple orthogonal methods\",\n      \"pmids\": [\"32042051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Full-length ER-anchored HO-1 disrupts STING polymerization and subsequent COPII-mediated ER-to-Golgi transport, suppressing downstream IFN signaling. Additionally, radiation-induced cleavage of HO-1 generates a fragment that undergoes nuclear translocation, where it interacts with cGAS and inhibits its nuclear export, suppressing cGAMP production and type-I IFN induction. HO-1 thus comprehensively inhibits the cGAS/STING pathway.\",\n      \"method\": \"Unbiased CRISPR screen, biochemical STING polymerization assay, COPII transport assay, nuclear fractionation showing cleaved HO-1 nuclear localization, cGAS co-immunoprecipitation, cGAMP measurement, in vivo tumor radiotherapy with HO-1 inhibitors\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — unbiased CRISPR screen plus multiple biochemical mechanistic assays (STING polymerization, nuclear translocation, Co-IP with cGAS, cGAMP quantification) in single rigorous study\",\n      \"pmids\": [\"39621310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HMOX1 interacts directly with lactate dehydrogenase B (LDHB) in foamy macrophages; this interaction enables the mitochondrial protease LONP1 to degrade mitochondrial transcription factor A (TFAM), causing mitochondrial dysfunction and sensitizing cells to ferroptosis. This mechanism operates specifically in TREM2-low foamy macrophages with low oxidative phosphorylation.\",\n      \"method\": \"Single-cell and bulk RNA sequencing, Co-immunoprecipitation (HMOX1-LDHB interaction), LONP1 inhibitor (bortezomib) rescue, MitoTEMPO treatment, mouse atherosclerosis model\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP defining HMOX1-LDHB complex, mechanistic pathway rescue experiments with inhibitors in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"39731912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The lncRNA RGMB-AS1 interacts with HO-1 (HMOX1) protein and prevents its ubiquitination by the E3 ligase TRC8, thereby stabilizing HMOX1 protein and promoting ferroptosis in NSCLC cells. RGMB-AS1 also independently binds to NAA10 (residues 82–87) to stimulate its acetyltransferase activity.\",\n      \"method\": \"Co-immunoprecipitation (RGMB-AS1–HMOX1 interaction), TRC8 ubiquitination assay, domain mapping (NAA10 residues 82–87), siRNA knockdown, in vivo xenograft model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with domain mapping, single laboratory; note this involves a lncRNA but the mechanistic discovery is about HMOX1 protein stabilization\",\n      \"pmids\": [\"38574881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Heat shock factor 4 (HSF4) directly binds to the heat shock element (HSE) in the HMOX1 promoter (at -389 to -362 bp upstream of the TSS) to activate HMOX1 transcription in human lens epithelial cells. HSF4 siRNA knockdown inhibits HMOX1 expression.\",\n      \"method\": \"Luciferase reporter assay, promoter deletion/mutation mapping, siRNA knockdown, Western blot and qPCR\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with promoter mapping and siRNA rescue, single laboratory\",\n      \"pmids\": [\"29454088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGR-1 (early growth response 1) transcription factor regulates HO-1 expression induced by cigarette smoke. EGR-1 undergoes nuclear localization in lung fibroblasts after CSE exposure, and an EGR-1 binding site in the HO-1 enhancer region is responsible for induction. Egr-1-deficient MEFs show decreased CSE-induced HO-1 expression, and CS-exposed EGR-1 loss-of-function mice show exaggerated lung injury.\",\n      \"method\": \"Luciferase reporter assay with EGR-1 binding site, Egr-1 knockout MEFs, nuclear localization imaging, in vivo CS exposure model\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus genetic KO validation, single laboratory\",\n      \"pmids\": [\"20417178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nrf2 is required for CsA-stimulated HO-1 mRNA expression in human gingival fibroblasts. ERK kinase inhibition reduces CsA-stimulated Nrf2 nuclear translocation and HO-1 mRNA expression. NF-κB inhibition has no effect on CsA-stimulated HO-1, establishing Nrf2 (not NF-κB) as the mediator of CsA-induced HO-1 expression via ERK signaling.\",\n      \"method\": \"siRNA knockdown of Nrf2, NF-κB inhibitor, ERK kinase inhibitor, nuclear translocation assay, RT-PCR\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus pharmacological inhibitors define pathway, single laboratory\",\n      \"pmids\": [\"21622902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Iron-mediated upregulation of HMOX1 in hepatoma cells expressing HCV operates through the Nrf2 pathway: Nrf2 siRNA knockdown decreases FeNTA-mediated HMOX1 mRNA upregulation. Iron does not affect Bach1 (a repressor of HMOX1) mRNA or protein levels, distinguishing iron-Nrf2 from iron-Bach1 mechanisms in this context.\",\n      \"method\": \"Nrf2 siRNA knockdown, Western blot, qRT-PCR, deferoxamine inhibition\",\n      \"journal\": \"World journal of gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA mechanistic dissection with pharmacological controls, single laboratory\",\n      \"pmids\": [\"19777608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HMOX1 promotes ferroptosis by catalyzing heme degradation to release Fe²⁺ (ferrous iron). In human lens epithelial cells (HLECs) and cisplatin-resistant ovarian cancer cells, forced HMOX1 overexpression increases intracellular Fe²⁺ and lipid peroxidation and sensitizes cells to ferroptosis, while HMOX1 knockout/knockdown reduces Fe²⁺ and attenuates ferroptosis. This identifies HMOX1 as a pro-ferroptotic enzyme through its iron-liberating catalytic activity.\",\n      \"method\": \"CRISPR-Cas9 HMOX1 knockout, lentiviral overexpression, siRNA knockdown, ferrous/ferric iron measurement, lipid peroxidation assay (MDA), cell viability\",\n      \"journal\": \"Current eye research; Phytomedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple independent laboratories using gain- and loss-of-function with direct iron measurement confirm HMOX1 enzymatic activity as mechanistic driver of Fe²⁺ accumulation and ferroptosis\",\n      \"pmids\": [\"36300537\", \"36773431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"P300 (histone acetyltransferase) normally interacts with HIF-1α to suppress HMOX1 expression. When P300 expression is reduced by ferroptosis inducers, HIF-1α preferentially binds P53 instead, driving HMOX1 overexpression and promoting VSMC ferroptosis. Co-immunoprecipitation confirmed competitive binding of P300 and P53 to HIF-1α.\",\n      \"method\": \"Co-immunoprecipitation (P300–HIF-1α and HIF-1α–P53 interactions), shRNA knockdown, specific inhibitor A-485, HIF-1α inhibitor BAY87-2243 rescue, lipid peroxidation assay\",\n      \"journal\": \"Molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP defines competitive binding and pathway, multiple knockdown and inhibitor rescue experiments, single laboratory\",\n      \"pmids\": [\"37415103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ythdf2 (an m6A reader protein) promotes degradation of Hmox1 mRNA in an m6A-dependent manner in alveolar macrophages. Myeloid-specific Ythdf2 knockout results in elevated Hmox1 mRNA and protein, attenuated macrophage polarization and oxidative stress, and protection from pulmonary hypertension. Pharmacological inhibition of Hmox1 reversed the protective phenotype of Ythdf2 knockout mice.\",\n      \"method\": \"Myeloid-specific Ythdf2 knockout mice, m6A-dependent mRNA stability assay, Hmox1 inhibitor rescue, right ventricular hypertrophy and pulmonary vascular remodeling readouts\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with mechanistic mRNA degradation assay and pharmacological rescue, single laboratory\",\n      \"pmids\": [\"36801705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The histone acetyltransferase Kat2a promotes ferroptosis in diabetic cardiomyopathy by increasing H3K27ac and H3K9ac enrichment on the promoter regions of Tfrc and Hmox1, thereby enhancing their transcription. This Kat2a-driven upregulation of Hmox1 (and Tfrc) increases iron availability and promotes ferroptosis.\",\n      \"method\": \"ChIP assay (H3K27ac and H3K9ac enrichment on Hmox1 promoter), Kat2a inhibition/overexpression, in vitro high-glucose cardiomyocyte model, in vivo DCM model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP defines direct epigenetic activation of Hmox1 promoter with functional ferroptosis readout, single laboratory\",\n      \"pmids\": [\"38858351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Scavenging of hemoglobin:haptoglobin complexes via CD163 receptor on macrophages leads to nuclear translocation of Nrf2, upregulation of HO-1, and release of IL-10. This CD163-Nrf2-HO-1-IL-10 axis mediates M1-to-M2 macrophage switching, and IL-10 feeds back to further upregulate CD163.\",\n      \"method\": \"Macrophage receptor (CD163) signaling experiments, Nrf2 nuclear translocation assay, hemin activation in rodent diabetes models, Hp2 polymorphism association studies\",\n      \"journal\": \"Current pharmaceutical design\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway defined by multiple experimental approaches including receptor-mediated signaling and in vivo models, but review paper citing multiple studies\",\n      \"pmids\": [\"30014796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mkp-1 (mitogen-activated protein kinase phosphatase 1) directly interacts with the DIDLID motif of Nrf2, increasing Nrf2 stability and positively regulating HO-1 expression. Conversely, Nrf2 activates Mkp-1 transcription via antioxidant response elements (AREs) in the Mkp-1 promoter. Mkp-1-/- mice show increased susceptibility to DSS-induced colitis.\",\n      \"method\": \"Co-immunoprecipitation (Mkp-1–Nrf2 DIDLID motif interaction), Mkp-1 knockout mice, ARE-driven luciferase reporter assay, siRNA, Western blot\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein interaction defined by Co-IP with domain mapping, genetic KO mice, reporter assay; single laboratory\",\n      \"pmids\": [\"30061089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HO-1 induction in cardiomyocytes during hypoxia/reoxygenation (H/R) injury promotes autophagy (increased LC3II, decreased p62) and protects mitochondrial membrane potential and reduces mitochondrial ROS. HO-1 overexpression (Lv-HO1-H9c2 cell line) enhances autophagic flux, while HO-1 inhibition with ZnPP suppresses autophagy and worsens mitochondrial dysfunction.\",\n      \"method\": \"Lentiviral HO-1 overexpression, HO-1 inhibitor (ZnPP), LC3II/p62 Western blot, RFP-GFP-LC3 double-label adenovirus confocal microscopy, JC-1 mitochondrial membrane potential assay, flow cytometry\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with multiple orthogonal autophagy/mitochondrial readouts, single laboratory\",\n      \"pmids\": [\"27138700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PTGDS (prostaglandin D2 synthase) interacts with HMOX1 protein, and targeting PTGDS increases intracellular iron levels and induces ferroptosis through promoting HMOX1-mediated heme catabolism and ferritin autophagy. An H25A mutation in HMOX1 was identified as the key functional residue for this PTGDS-dependent ferroptotic role.\",\n      \"method\": \"Co-immunoprecipitation (PTGDS–HMOX1), TMT mass spectrometry, RNA-seq, site-directed mutagenesis (H25A), lentiviral gene silencing, xenograft model\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus site mutagenesis identifying functional residue, in vivo validation; single laboratory\",\n      \"pmids\": [\"39706989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Nrf2 binds to ARE sequences in the promoter regions of HO-1 (HMOX1), GCLM, and x-CT target genes in neuroblastoma cells treated with bortezomib, driving their transcription. HO-1 silencing combined with GSH depletion synergistically decreases cell viability in bortezomib-treated cells, demonstrating that HO-1 contributes to Nrf2-mediated chemoresistance.\",\n      \"method\": \"Nrf2 ChIP/ARE binding assay, HO-1 siRNA silencing, pharmacological GSH depletion, cell viability assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ARE binding assay plus functional siRNA rescue, single laboratory\",\n      \"pmids\": [\"27023064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IFI16 activates HMOX1 transcription by interacting with the transcription factors JUND and SP1 through its pyrin domain, thereby robustly facilitating HMOX1 expression. Elevated HMOX1 attenuates ferroptosis (reduced lipid peroxidation, ROS, and Fe²⁺) after irradiation, enhancing radioresistance in glioblastoma. The compound glyburide disrupts IFI16 function and reduces HMOX1 expression, restoring radiosensitivity.\",\n      \"method\": \"Co-immunoprecipitation (IFI16–JUND, IFI16–SP1 via pyrin domain), CRISPR/IFI16 manipulation, HMOX1 reporter/ChIP, radioresistant GBM cell model, ferroptosis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with domain mapping (pyrin domain), transcription factor complex, functional rescue, in vivo validation; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"39890789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FOSL1 (a transcription factor) transcriptionally activates HMOX1 by binding to its promoter. Juglone increases FOSL1 and HMOX1 expression, driving ferroptosis in HCC cells; HMOX1 silencing attenuates juglone-induced ferroptosis. Dual-luciferase reporter assay identified the specific FOSL1 binding site in the HMOX1 promoter.\",\n      \"method\": \"Dual-luciferase reporter assay with HMOX1 promoter, gene silencing (HMOX1 siRNA), RNA-seq and proteomics, xenograft model\",\n      \"journal\": \"Phytomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay identifies binding site, siRNA rescue confirms functional role, single laboratory\",\n      \"pmids\": [\"39923427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Prolactin (PRL) increases HO-1 expression and protein synthesis in human macrophages in a time- and dose-dependent manner, and PRL-treated macrophages show enhanced VEGF release. HO-1 activity is required for PRL-induced VEGF production, as demonstrated using the HO inducer SnCl₂ and the HO inhibitor SnMP.\",\n      \"method\": \"RT-real-time PCR, Western blot, ELISA for VEGF, pharmacological HO-1 inducer (SnCl₂) and inhibitor (SnMP) experiments\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological gain- and loss-of-function with multiple readouts, but no direct binding assay; consistent with established HO-1 biology\",\n      \"pmids\": [\"15352176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HO-1 induction in microglia (not astrocytes) mediates curcumin's glioprotective and anti-inflammatory effects. Glial cultures from LysM(Cre) Hmox(Δ/Δ) microglial-specific HO-1 knockout mice lose curcumin's protective effect. HO-1 inhibitor SnPP blocks curcumin-afforded ROS reduction and cell protection, and HO-1 promotes microglial ramified anti-inflammatory morphology in an HO-1-dependent manner.\",\n      \"method\": \"Myeloid-specific HO-1 conditional knockout (LysM(Cre) Hmox(Δ/Δ)), SnPP HO-1 inhibitor, primary glial cultures, morphological analysis, cytokine measurement\",\n      \"journal\": \"Molecular nutrition & food research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific genetic KO plus pharmacological inhibitor, mechanistic cellular phenotype, single laboratory\",\n      \"pmids\": [\"26047311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HO-1 induction in prostate cancer cells (PC3, C4-2B) with hemin impairs cellular metabolic rate, reducing glucose uptake, ATP production, LDH activity, and extracellular lactate, indicating HO-1 modulates aerobic glycolysis through lactate dehydrogenase (LDH).\",\n      \"method\": \"Pharmacological HO-1 induction (hemin), glucose uptake assay, ATP measurement, LDH activity assay, lactate measurement\",\n      \"journal\": \"Antioxidants (Basel, Switzerland)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological induction only, no direct binding or genetic KO, single laboratory\",\n      \"pmids\": [\"34208670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Ginsenoside Rb1 specifically targets HO-1 protein at the K18A residue, as determined by molecular docking, surface plasmon resonance (SPR), and microscale thermophoresis (MST). Rb1 reduces HO-1 expression, inhibits ferroptosis in sepsis-induced organ tissues, and improves sepsis outcomes in vivo.\",\n      \"method\": \"Molecular docking, surface plasmon resonance, microscale thermophoresis (direct binding assays), HO-1 inhibitor (ZNPP), CLP mouse model, in vitro LPS/THP-1\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — three orthogonal direct binding methods (docking, SPR, MST) identify HO-1 as molecular target with key residue; in vivo validation, single laboratory\",\n      \"pmids\": [\"39510452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HMOX1 knockdown in human endothelial cells attenuates Fe²⁺ overload, reduces iron content and ROS, alleviates lipid peroxidation, and reduces ferroptosis in a diabetic high-glucose/high-lipid context, demonstrating that HMOX1 upregulation is causally responsible for increased ferroptosis in diabetic atherosclerosis.\",\n      \"method\": \"siRNA knockdown of HMOX1, ferrostatin-1 ferroptosis inhibitor, Fe²⁺ iron content measurement, ROS detection, lipid peroxidation assay\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with mechanistic iron/ROS readouts in human cells, single laboratory\",\n      \"pmids\": [\"34508760\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HMOX1 encodes heme oxygenase-1 (HO-1), an inducible 32-kDa microsomal enzyme that catalyzes the rate-limiting oxidative degradation of heme to carbon monoxide (CO), ferrous iron (Fe²⁺), and biliverdin; it is transcriptionally activated primarily by Nrf2 (via ARE elements), with additional regulation by EGR-1, HSF4, FOSL1, IFI16/JUND/SP1 complexes, progesterone, and epigenetic modifiers (Kat2a, histone lactylation); post-translationally, HO-1 protein stability is controlled by SIAH2-mediated ubiquitination at K243 and counteracted by USP7-mediated deubiquitination; beyond its catalytic role, HO-1 exerts non-enzymatic functions including scaffolding IRF3 phosphorylation in innate immune signaling, disrupting STING polymerization and cGAS nuclear export to suppress the cGAS/STING/IFN-I pathway, regulating mitochondrial quality control via the NRF-1/Pink1/Parkin axis, and interacting with LDHB to drive LONP1-mediated TFAM degradation leading to mitochondrial dysfunction and ferroptosis; through its Fe²⁺-liberating catalytic activity, HO-1 can be pro-ferroptotic (promoting iron-dependent lipid peroxidation) or cytoprotective depending on cellular context, and its mRNA stability is negatively regulated by the m6A reader YTHDF2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HMOX1 encodes the inducible 32-kDa microsomal enzyme heme oxygenase-1 (HO-1), which catalyzes the regiospecific oxidative degradation of heme to carbon monoxide, ferrous iron (Fe²⁺), and biliverdin, distinguishing it from the constitutive, inducer-unresponsive HO-2 isoform [#0]. HMOX1 transcription is a major node of stress-responsive gene regulation: the antioxidant pathway transcription factor Nrf2 binds ARE elements in the HMOX1 promoter to drive its induction [#24], with Nrf2 activity itself tuned by upstream signaling and stabilizing partners including ERK signaling [#14], Mkp-1 [#21], and SIAH2 [#8], and by CD163-mediated hemoglobin scavenging in macrophages [#20]. Additional sequence-specific activators converge on the promoter and enhancer, including EGR-1 during cigarette-smoke exposure [#13], HSF4 in lens epithelium [#12], FOSL1 [#26], an IFI16–JUND–SP1 complex acting through the IFI16 pyrin domain [#25], and a HIF-1α/P53 versus HIF-1α/P300 competitive switch [#17]; epigenetic and post-transcriptional layers add Kat2a-driven histone acetylation at the promoter [#20, #19] and YTHDF2-mediated m6A-dependent decay of Hmox1 mRNA [#18]. At the protein level, HO-1 abundance is set by ubiquitin-dependent turnover: SIAH2 directs proteasomal degradation [#8], the K243-linked ubiquitinated pool is reversed by USP7-mediated deubiquitination and stabilization under oxidative stress [#6, #7], and the lncRNA RGMB-AS1 shields HO-1 from TRC8-mediated ubiquitination [#11]. Through its Fe²⁺-liberating catalytic activity HO-1 is a central determinant of ferroptosis, where forced expression raises intracellular Fe²⁺ and lipid peroxidation and knockdown attenuates iron-dependent cell death across diverse cell types [#16, #31]. HO-1 also performs catalysis-independent functions: it scaffolds IRF3 phosphorylation in innate immune signaling [#1], and ER-anchored full-length HO-1 disrupts STING polymerization while a cleaved nuclear fragment binds cGAS to suppress its export and cGAMP production, broadly inhibiting the cGAS/STING type-I interferon pathway [#9]. In addition, HO-1 governs mitochondrial quality control via an Nrf-1/Pink1/Parkin mitophagy program [#2] and, through direct interaction with LDHB, enables LONP1-mediated TFAM degradation driving mitochondrial dysfunction and ferroptosis in foamy macrophages [#10]. A transgenic study links astrocytic HMOX1 overexpression to α-synuclein accumulation and dopaminergic dysfunction [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established that HO-1 activity is functionally required downstream of a physiological stimulus, showing prolactin-induced VEGF release in macrophages depends on HO activity.\",\n      \"evidence\": \"Pharmacological HO inducer/inhibitor and VEGF ELISA in human macrophages\",\n      \"pmids\": [\"15352176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct binding or genetic evidence linking HO-1 to VEGF machinery\", \"Mechanism connecting CO/biliverdin to VEGF unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed a non-enzymatic scaffold function: HO-1 complexes with IRF3 and is required for its phosphorylation and type-I interferon induction in myeloid cells.\",\n      \"evidence\": \"Co-IP and myeloid-specific Hmox1 knockout mice with gene expression readouts\",\n      \"pmids\": [\"21842368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of HO-1–IRF3 interaction undefined\", \"Single-laboratory report\", \"Relationship between scaffold and catalytic roles unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Distinguished iron-induced HMOX1 upregulation as Nrf2-dependent rather than Bach1-dependent, refining the regulatory logic of iron sensing.\",\n      \"evidence\": \"Nrf2 siRNA knockdown and deferoxamine controls in HCV-expressing hepatoma cells\",\n      \"pmids\": [\"19777608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ARE occupancy not measured in this context\", \"Single laboratory\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified EGR-1 as a context-specific activator of HO-1 in cigarette-smoke responses, broadening the transcription factor repertoire beyond Nrf2.\",\n      \"evidence\": \"Reporter assay with EGR-1 binding site, Egr-1 knockout MEFs, in vivo CS exposure\",\n      \"pmids\": [\"20417178\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interplay between EGR-1 and Nrf2 at the locus undefined\", \"Single laboratory\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed HO-1 downstream of progesterone in maternal-fetal immune tolerance, linking promoter methylation to CD8+ T cell tolerance and fetal growth.\",\n      \"evidence\": \"Progesterone receptor and Hmox1 knockout mice, promoter methylation, progesterone rescue\",\n      \"pmids\": [\"25774501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between HO-1 products and tolerogenic T cell induction unresolved\", \"Specific methyltransferase not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated HO-1 is a direct Nrf2/ARE target gene contributing to a coordinated antioxidant transcriptional program and chemoresistance.\",\n      \"evidence\": \"Nrf2 ARE ChIP/binding assay and HO-1 siLencing with GSH depletion in neuroblastoma\",\n      \"pmids\": [\"27023064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of HO-1 versus other Nrf2 targets unresolved\", \"Single laboratory\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a cytoprotective role for HO-1 in mitochondrial quality control, acting through the Pgc-1α/NRF-1 axis to enable Pink1/Park2-mediated mitophagy.\",\n      \"evidence\": \"Cardiomyocyte-specific Hmox1 knockout, EM, LC3II immunoblotting, NRF-1 promoter binding\",\n      \"pmids\": [\"28194437\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the effect requires catalysis versus protein function not separated\", \"Direct HO-1 input to NRF-1 unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded the activating transcription factor set with HSF4 binding a defined HSE in the HMOX1 promoter in lens epithelium.\",\n      \"evidence\": \"Luciferase reporter with promoter mapping and HSF4 siRNA knockdown\",\n      \"pmids\": [\"29454088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance not tested\", \"Single laboratory\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established positive feedback regulators of the Nrf2-HO-1 axis (Mkp-1 stabilizing Nrf2; CD163-Nrf2-HO-1-IL-10 macrophage switching), explaining amplification of HO-1 induction.\",\n      \"evidence\": \"Co-IP with DIDLID motif mapping and Mkp-1 KO mice; CD163 receptor signaling and Nrf2 translocation in macrophages\",\n      \"pmids\": [\"30061089\", \"30014796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CD163 axis derived partly from review-level synthesis\", \"Direct HO-1 promoter occupancy by these factors not the focus\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked astrocytic HMOX1 overexpression to neurodegenerative pathology via miR-153/miR-223 downregulation and α-synuclein accumulation, and to mitochondrial iron-driven oxidative injury.\",\n      \"evidence\": \"GFAP.HMOX1 transgenic mice, miRNA profiling, α-synuclein siRNA rescue, neuron-astrocyte co-culture; HO-1 overexpression with mitochondrial iron and MPT pore assays\",\n      \"pmids\": [\"31180611\", \"19874266\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression models may not reflect endogenous levels\", \"Mechanism linking HO-1 to specific miRNAs undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified SIAH2 as the E3 ligase driving proteasomal HO-1 degradation, with a dual effect via direct degradation and Nrf2-mediated transcription.\",\n      \"evidence\": \"SIAH2 KO mice and CRISPR human cells, RING-dependent Co-IP, proteasome inhibitor experiments\",\n      \"pmids\": [\"32042051\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific HO-1 ubiquitination site by SIAH2 not pinpointed here\", \"Tissue selectivity of the effect unexplained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the deubiquitination arm of HO-1 stability control, showing USP7 binds HO-1 and reverses K243 ubiquitination to stabilize it under oxidative stress.\",\n      \"evidence\": \"Co-IP, ubiquitination assay with K243/K476 site mutagenesis, USP7 depletion, in vivo tumor and HCC specimen correlation\",\n      \"pmids\": [\"35821281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether USP7 antagonizes SIAH2 directly not tested\", \"Trigger for USP7 K476 ubiquitination unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established HO-1 catalytic activity as a direct pro-ferroptotic driver through Fe²⁺ liberation, generalizing across multiple cell types and disease contexts.\",\n      \"evidence\": \"CRISPR knockout, overexpression, siRNA with direct Fe²⁺ and lipid peroxidation measurement in lens, ovarian cancer, and endothelial cells\",\n      \"pmids\": [\"36300537\", \"36773431\", \"34508760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of pro-ferroptotic versus cytoprotective outcome incompletely defined\", \"Downstream lipid peroxidation effectors not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Added post-transcriptional and replicated post-translational stability controls: YTHDF2-driven m6A decay of Hmox1 mRNA and a second USP7-HMOX1 stabilization context.\",\n      \"evidence\": \"Myeloid Ythdf2 KO with mRNA stability assay and Hmox1 inhibitor rescue; Co-IP and deubiquitination in SCI rat model\",\n      \"pmids\": [\"36801705\", \"37257587\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"m6A sites on Hmox1 transcript not mapped\", \"Generalizability of USP7 axis across tissues partial\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Uncovered comprehensive catalysis-independent suppression of innate immunity by HO-1, both blocking STING polymerization/ER-to-Golgi transport and, as a cleaved nuclear fragment, inhibiting cGAS nuclear export.\",\n      \"evidence\": \"Unbiased CRISPR screen, STING polymerization and COPII transport assays, nuclear fractionation, cGAS Co-IP, cGAMP quantification, in vivo radiotherapy\",\n      \"pmids\": [\"39621310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease generating the cleaved HO-1 fragment not identified\", \"Balance between enzymatic and immune-suppressive roles unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a direct HMOX1-LDHB interaction that couples HO-1 to mitochondrial dysfunction via LONP1-mediated TFAM degradation in foamy macrophages.\",\n      \"evidence\": \"scRNA/bulk RNA-seq, reciprocal Co-IP, LONP1 inhibitor and MitoTEMPO rescue, mouse atherosclerosis model\",\n      \"pmids\": [\"39731912\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural interface of HMOX1-LDHB undefined\", \"Whether catalysis is required for the interaction unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped additional transcriptional and protein-interaction control nodes: an IFI16-JUND-SP1 activating complex, FOSL1 promoter binding, HIF-1α/P53 versus P300 switching, Kat2a histone acetylation, PTGDS interaction, and a druggable HO-1 protein interface (H25A/K18A residues).\",\n      \"evidence\": \"Co-IP with domain mapping, ChIP, reporter assays, site-directed mutagenesis, SPR/MST binding, xenograft and disease models\",\n      \"pmids\": [\"39890789\", \"39923427\", \"37415103\", \"38858351\", \"39706989\", \"39510452\", \"38574881\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each regulator largely single-laboratory and context-specific\", \"Integration of these inputs into one regulatory hierarchy unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the catalytic (Fe²⁺-liberating, pro-ferroptotic) and non-enzymatic (immune-suppressive, scaffold, mitochondrial) functions of HO-1 are switched within a single cell, and what determines the cytoprotective versus cytotoxic balance, remains unresolved.\",\n      \"evidence\": \"No single study in the corpus reconciles enzymatic and non-enzymatic outputs mechanistically\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model of catalytic versus scaffold function\", \"Determinants of context-dependent ferroptotic outcome undefined\", \"Protease and signals controlling HO-1 cleavage/subcellular partitioning unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 9, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [16, 31, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 9, 20]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [24, 6, 2]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"IRF3\", \"USP7\", \"SIAH2\", \"LDHB\", \"cGAS\", \"STING\", \"PTGDS\", \"TRC8\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}