{"gene":"GLRX","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2007,"finding":"GRX1 (glutaredoxin 1) is localized exclusively in the mitochondrial intermembrane space, while GRX2 is localized exclusively in the mitochondrial matrix, as determined by subcellular fractionation of mitochondria. This distinct localization suggests GRX1 and GRX2 regulate different mitochondrial functions via reversible S-glutathionylation.","method":"Subcellular fractionation of mitochondria, Western blotting","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 — direct fractionation experiment with functional hypothesis; single lab, single method","pmids":["17845131"],"is_preprint":false},{"year":2015,"finding":"GLRX1 (Grx1) protects retinal pigment epithelial cells from H2O2-induced apoptosis by catalyzing deglutathionylation of AKT, thereby maintaining AKT phosphorylation and pro-survival signaling. Grx1 overexpression prevented AKT glutathionylation detected by immunoprecipitation with anti-PSSG antibody.","method":"Overexpression/siRNA knockdown, immunoprecipitation with anti-PSSG antibody, Western blot for phospho-AKT, annexin V/PI apoptosis assay","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal IP and functional rescue with KD/OE; single lab but multiple orthogonal methods","pmids":["25788646"],"is_preprint":false},{"year":2012,"finding":"Grx1 ablation in mice reduces cigarette smoke-induced lung inflammation, evidenced by decreased levels of inflammatory mediators, neutrophils, dendritic cells, and lymphocytes in bronchoalveolar lavage fluid. Grx1 KO increased S-glutathionylation (PSSG) in lung tissue and lavaged cells, demonstrating Grx1's role in removing protein glutathionylation to regulate NF-κB-dependent inflammatory signaling.","method":"Grx1 KO mouse model, cigarette smoke exposure, cytokine/cell counting in BALF, PSSG measurement by immunoblotting","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype and biochemical readout; single lab, multiple methods","pmids":["22723915"],"is_preprint":false},{"year":2023,"finding":"NRF1 transcriptionally upregulates METTL3, which in turn promotes N6-methyladenosine (m6A) modification of GLRX mRNA in an IGF2BP2-dependent manner to stabilize GLRX mRNA. This NRF1/METTL3/GLRX axis protects dopaminergic neurons in a mouse model of Parkinson's disease, as demonstrated by ChIP, RIP, and dual luciferase assays.","method":"ChIP assay, RIP assay, dual luciferase assay, MeRIP (m6A profiling), gain/loss-of-function in MPTP mouse model, immunohistochemistry","journal":"CNS neuroscience & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal molecular methods establishing pathway; single lab","pmids":["37735974"],"is_preprint":false},{"year":2019,"finding":"GLRX inhibition enhances gefitinib sensitivity in EGFR-TKI-resistant NSCLC cells by promoting apoptosis and cell cycle arrest via the EGFR/FoxM1 signaling pathway, with increased ROS generation and mitochondrial membrane potential loss.","method":"siRNA knockdown, CCK-8 proliferation assay, flow cytometry (apoptosis, cell cycle), JC-1 staining, ROS assay, mouse tumor xenograft","journal":"Journal of cancer research and clinical oncology","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined cellular and in vivo phenotype with pathway placement; single lab, multiple methods","pmids":["30661098"],"is_preprint":false},{"year":2017,"finding":"GRX1 overexpression in osteoarthritis chondrocytes inhibits oxidative stress and apoptosis by upregulating CREB transcription factor activity, which increases HO-1 expression; this pathway was validated by showing that HO-1 downstream effects require CREB induction by GRX1.","method":"GRX1 overexpression, Western blot, RT-qPCR, MDA/SOD assay, annexin V/PI apoptosis assay, caspase-3 activity assay","journal":"Molecular immunology","confidence":"Low","confidence_rationale":"Tier 3 — overexpression with phenotype but limited direct mechanistic validation of CREB/HO-1 as direct substrates","pmids":["28843170"],"is_preprint":false},{"year":2023,"finding":"Grx1 ablation leads to increased glutathionylation of HIF-1α, stabilizing HIF-1α and inducing VEGF-A production in lung tissue. Pharmacological inhibition of HIF-1α (YC-1) reversed these effects, establishing that Grx1 controls pulmonary angiogenesis through HIF-1α deglutathionylation.","method":"Grx1 KO mouse model, measurement of GSH-protein adducts, VEGF-A quantification, YC-1 pharmacological inhibition, histological analysis","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 — KO + pharmacological rescue establishing HIF-1α glutathionylation as mechanistic link; single lab","pmids":["36640422"],"is_preprint":false},{"year":2020,"finding":"Grx1 deficiency in mice causes spontaneous skeletal muscle atrophy associated with inhibition of p-AMPK and Sirt1 activity, leading to intramuscular lipid deposition and glucose utilization disorder; metformin treatment partially rescued this phenotype.","method":"Grx1 KO mouse model, Western blot for p-AMPK/Sirt1, lipid staining, glucose utilization assays, metformin rescue experiment","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 — KO phenotype with pathway placement but no direct mechanistic link between Grx1 and AMPK/Sirt1 established","pmids":["33069361"],"is_preprint":false},{"year":2020,"finding":"CRISPR/Cas9-generated Grx1-deficient HeLaS3 cells show increased sensitivity to oxidative stress (γ-irradiation, heat shock, H2O2), with excessive accumulation of intracellular ROS, higher protein oxidation, elevated mitochondrial oxidants, increased cytochrome c release, and higher apoptosis rates, establishing Grx1's role in mitochondrial redox homeostasis.","method":"CRISPR/Cas9 KO, fluorescent ROS probe (DCFDA), Western blot for oxidized proteins/Prx2, MitoSox Red staining, annexin V/EthD-III apoptosis assay","journal":"Free radical research","confidence":"Medium","confidence_rationale":"Tier 2 — clean CRISPR KO with multiple orthogonal readouts linking Grx1 to mitochondrial redox and apoptosis","pmids":["32892658"],"is_preprint":false},{"year":1996,"finding":"The human glutaredoxin gene (GLRX) was mapped to chromosomal region 5q14 by fluorescence in situ hybridization (FISH) and somatic cell hybrid analysis.","method":"Fluorescence in situ hybridization (FISH), somatic cell hybrid panel analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — direct chromosomal localization by two independent methods","pmids":["8838810"],"is_preprint":false},{"year":2016,"finding":"PEP-1-GRX-1 fusion protein transduced into human chondrocytes suppresses MMP-13 expression and nitric oxide production by inhibiting MAPK and NF-κB activation in IL-1β- and LPS-stimulated chondrocytes, and reduces carrageenan-induced paw edema in vivo.","method":"Protein transduction, Western blot for MAPK/NF-κB activation, RT-qPCR, mouse carrageenan paw edema model, immunohistochemistry","journal":"Cellular physiology and biochemistry","confidence":"Low","confidence_rationale":"Tier 3 — functional data with pathway placement but uses fusion protein, not endogenous Grx1; single lab","pmids":["28214840"],"is_preprint":false},{"year":2025,"finding":"GRX1 regulates ferroptosis via the GRX1/GSK-3β/Nrf2 axis; GRX1 silencing or erastin treatment abolished the anti-ferroptotic effect of electroacupuncture in a mouse model of postoperative cognitive dysfunction.","method":"GRX1 silencing (siRNA), erastin treatment, Morris water maze, Western blot, RT-qPCR, MDA/GSH/iron level measurement, immunohistochemistry","journal":"Brain research bulletin","confidence":"Low","confidence_rationale":"Tier 3 — KD with phenotype and pathway placement, but indirect link between Grx1 and GSK-3β/Nrf2; single lab","pmids":["39889835"],"is_preprint":false}],"current_model":"GLRX (Glutaredoxin 1) is a cytosolic/intermembrane space thiol-disulfide oxidoreductase that catalyzes reversible protein deglutathionylation (removal of protein-glutathione mixed disulfides), thereby regulating redox-sensitive signaling through substrates including AKT and HIF-1α, controlling NF-κB-dependent inflammation, and maintaining mitochondrial redox homeostasis and cell survival under oxidative stress; its mRNA stability is regulated by METTL3-mediated m6A modification downstream of NRF1 transcriptional activity."},"narrative":{"teleology":[{"year":1996,"claim":"Chromosomal localization of the human GLRX gene to 5q14 established its genomic identity, enabling subsequent functional studies.","evidence":"FISH and somatic cell hybrid analysis","pmids":["8838810"],"confidence":"Medium","gaps":["No functional characterization at this stage","No regulatory elements identified"]},{"year":2007,"claim":"Determining that GRX1 localizes exclusively to the mitochondrial intermembrane space (while GRX2 resides in the matrix) established compartment-specific roles for glutaredoxin isoforms in mitochondrial redox regulation.","evidence":"Subcellular fractionation of mitochondria with Western blotting","pmids":["17845131"],"confidence":"Medium","gaps":["Single fractionation approach without immunofluorescence confirmation","Cytosolic pool not addressed in this study","No functional consequences of compartmentalization tested"]},{"year":2012,"claim":"Grx1 knockout mice showed that endogenous Grx1 is required for NF-κB-dependent inflammatory signaling in vivo, as its absence increased global protein S-glutathionylation and reduced cigarette smoke-induced lung inflammation.","evidence":"Grx1 KO mouse, cigarette smoke exposure, BALF cytokine/cell counting, PSSG immunoblotting","pmids":["22723915"],"confidence":"Medium","gaps":["Specific NF-κB subunit glutathionylation sites not identified","No reconstitution with catalytically dead Grx1 to confirm enzymatic requirement"]},{"year":2015,"claim":"Identification of AKT as a direct deglutathionylation substrate of Grx1 established a mechanistic link between Grx1 activity and pro-survival signaling through maintenance of AKT phosphorylation.","evidence":"Overexpression/siRNA knockdown in retinal pigment epithelial cells, immunoprecipitation with anti-PSSG antibody, phospho-AKT Western blot, apoptosis assay","pmids":["25788646"],"confidence":"Medium","gaps":["Specific glutathionylated cysteine residue on AKT not mapped","In vivo validation of AKT deglutathionylation not performed"]},{"year":2019,"claim":"GLRX inhibition sensitized EGFR-TKI-resistant NSCLC cells to gefitinib through ROS-mediated apoptosis and cell cycle arrest, placing GLRX in the EGFR/FoxM1 signaling axis relevant to drug resistance.","evidence":"siRNA knockdown, proliferation/apoptosis/cell cycle assays, mouse xenograft","pmids":["30061098"],"confidence":"Medium","gaps":["Direct deglutathionylation target in EGFR/FoxM1 pathway not identified","No catalytic-dead rescue to confirm enzymatic mechanism"]},{"year":2020,"claim":"CRISPR-generated Grx1-null cells demonstrated that Grx1 is essential for mitochondrial redox homeostasis, as its loss caused excessive mitochondrial ROS, cytochrome c release, and apoptosis sensitivity to multiple oxidative stressors.","evidence":"CRISPR/Cas9 KO in HeLaS3, MitoSox Red, DCFDA, Western blot for oxidized proteins, annexin V apoptosis assay","pmids":["32892658"],"confidence":"Medium","gaps":["Specific mitochondrial substrates responsible for phenotype not identified","Rescue with IMS-targeted versus cytosolic Grx1 not tested"]},{"year":2023,"claim":"HIF-1α was identified as a deglutathionylation target of Grx1, establishing that Grx1 controls pulmonary angiogenesis by preventing glutathionylation-dependent HIF-1α stabilization and VEGF-A induction.","evidence":"Grx1 KO mouse, GSH-protein adduct measurement, VEGF-A quantification, YC-1 pharmacological rescue","pmids":["36640422"],"confidence":"Medium","gaps":["Specific glutathionylated cysteine on HIF-1α not mapped","Whether Grx1 acts on HIF-1α directly or through an intermediary not resolved"]},{"year":2023,"claim":"The NRF1–METTL3–IGF2BP2 axis was shown to regulate GLRX mRNA stability via m6A modification, revealing an epitranscriptomic layer of Grx1 regulation with neuroprotective consequences.","evidence":"ChIP, RIP, MeRIP, dual luciferase assay, MPTP mouse model of Parkinson's disease","pmids":["37735974"],"confidence":"Medium","gaps":["Specific m6A sites on GLRX mRNA not mapped at nucleotide resolution","Whether this regulatory axis operates in tissues beyond dopaminergic neurons is unknown"]},{"year":null,"claim":"A comprehensive substrate map for Grx1 deglutathionylation activity — including identification of specific cysteine residues on substrates like AKT and HIF-1α — and the structural basis for substrate selectivity remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No proteome-wide identification of Grx1-dependent deglutathionylation sites","No crystal structure of Grx1 bound to a glutathionylated substrate","Relative contributions of cytosolic versus IMS pools to specific phenotypes not delineated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[1,2,6,8]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,6]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2,8]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[1,2,6,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,10]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,8]}],"complexes":[],"partners":["AKT1","HIF1A","METTL3","IGF2BP2","NRF1"],"other_free_text":[]},"mechanistic_narrative":"GLRX (glutaredoxin 1) is a thiol-disulfide oxidoreductase that catalyzes protein deglutathionylation, thereby serving as a central regulator of redox-sensitive signaling, inflammatory responses, and cell survival under oxidative stress. GLRX removes glutathione mixed disulfides from specific substrates including AKT, maintaining its phosphorylation and pro-survival signaling [PMID:25788646], and HIF-1α, whose glutathionylation-dependent stabilization drives VEGF-A production and pulmonary angiogenesis in GLRX-deficient mice [PMID:36640422]. GLRX loss increases global protein S-glutathionylation in vivo, attenuating NF-κB-dependent inflammatory signaling as demonstrated by reduced cigarette smoke-induced lung inflammation in Grx1 knockout mice [PMID:22723915], and sensitizes cells to oxidative stress through excessive mitochondrial ROS accumulation, cytochrome c release, and apoptosis [PMID:32892658]. GLRX mRNA stability is regulated by the NRF1–METTL3 axis via m6A modification in an IGF2BP2-dependent manner, linking transcriptional and epitranscriptomic control to neuronal redox protection [PMID:37735974]."},"prefetch_data":{"uniprot":{"accession":"P35754","full_name":"Glutaredoxin-1","aliases":["Thioltransferase-1","TTase-1"],"length_aa":106,"mass_kda":11.8,"function":"Has a glutathione-disulfide oxidoreductase activity in the presence of NADPH and glutathione reductase. Reduces low molecular weight disulfides and proteins","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P35754/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GLRX","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GLRX","total_profiled":1310},"omim":[{"mim_id":"615679","title":"SH3 DOMAIN-BINDING GLUTAMIC ACID-RICH PROTEIN-LIKE PROTEIN 3; SH3BGRL3","url":"https://www.omim.org/entry/615679"},{"mim_id":"611386","title":"ACTIVITY-DEPENDENT NEUROPROTECTOR HOMEOBOX; ADNP","url":"https://www.omim.org/entry/611386"},{"mim_id":"606820","title":"GLUTAREDOXIN 2; GLRX2","url":"https://www.omim.org/entry/606820"},{"mim_id":"605482","title":"GLUTATHIONE S-TRANSFERASE, OMEGA-1; GSTO1","url":"https://www.omim.org/entry/605482"},{"mim_id":"601112","title":"THIOREDOXIN REDUCTASE 1; TXNRD1","url":"https://www.omim.org/entry/601112"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":806.3}],"url":"https://www.proteinatlas.org/search/GLRX"},"hgnc":{"alias_symbol":["GRX","GRX1"],"prev_symbol":[]},"alphafold":{"accession":"P35754","domains":[{"cath_id":"3.40.30.10","chopping":"1-106","consensus_level":"medium","plddt":96.995,"start":1,"end":106}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P35754","model_url":"https://alphafold.ebi.ac.uk/files/AF-P35754-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P35754-F1-predicted_aligned_error_v6.png","plddt_mean":97.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GLRX","jax_strain_url":"https://www.jax.org/strain/search?query=GLRX"},"sequence":{"accession":"P35754","fasta_url":"https://rest.uniprot.org/uniprotkb/P35754.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P35754/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P35754"}},"corpus_meta":[{"pmid":"17845131","id":"PMC_17845131","title":"What is the functional significance of the unique location of glutaredoxin 1 (GRx1) in the intermembrane space of mitochondria?","date":"2007","source":"Antioxidants & redox signaling","url":"https://pubmed.ncbi.nlm.nih.gov/17845131","citation_count":86,"is_preprint":false},{"pmid":"11399772","id":"PMC_11399772","title":"Characterization of glutathione amide reductase from Chromatium gracile. 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This distinct localization suggests GRX1 and GRX2 regulate different mitochondrial functions via reversible S-glutathionylation.\",\n      \"method\": \"Subcellular fractionation of mitochondria, Western blotting\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct fractionation experiment with functional hypothesis; single lab, single method\",\n      \"pmids\": [\"17845131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GLRX1 (Grx1) protects retinal pigment epithelial cells from H2O2-induced apoptosis by catalyzing deglutathionylation of AKT, thereby maintaining AKT phosphorylation and pro-survival signaling. Grx1 overexpression prevented AKT glutathionylation detected by immunoprecipitation with anti-PSSG antibody.\",\n      \"method\": \"Overexpression/siRNA knockdown, immunoprecipitation with anti-PSSG antibody, Western blot for phospho-AKT, annexin V/PI apoptosis assay\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal IP and functional rescue with KD/OE; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"25788646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Grx1 ablation in mice reduces cigarette smoke-induced lung inflammation, evidenced by decreased levels of inflammatory mediators, neutrophils, dendritic cells, and lymphocytes in bronchoalveolar lavage fluid. Grx1 KO increased S-glutathionylation (PSSG) in lung tissue and lavaged cells, demonstrating Grx1's role in removing protein glutathionylation to regulate NF-κB-dependent inflammatory signaling.\",\n      \"method\": \"Grx1 KO mouse model, cigarette smoke exposure, cytokine/cell counting in BALF, PSSG measurement by immunoblotting\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype and biochemical readout; single lab, multiple methods\",\n      \"pmids\": [\"22723915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRF1 transcriptionally upregulates METTL3, which in turn promotes N6-methyladenosine (m6A) modification of GLRX mRNA in an IGF2BP2-dependent manner to stabilize GLRX mRNA. This NRF1/METTL3/GLRX axis protects dopaminergic neurons in a mouse model of Parkinson's disease, as demonstrated by ChIP, RIP, and dual luciferase assays.\",\n      \"method\": \"ChIP assay, RIP assay, dual luciferase assay, MeRIP (m6A profiling), gain/loss-of-function in MPTP mouse model, immunohistochemistry\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal molecular methods establishing pathway; single lab\",\n      \"pmids\": [\"37735974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GLRX inhibition enhances gefitinib sensitivity in EGFR-TKI-resistant NSCLC cells by promoting apoptosis and cell cycle arrest via the EGFR/FoxM1 signaling pathway, with increased ROS generation and mitochondrial membrane potential loss.\",\n      \"method\": \"siRNA knockdown, CCK-8 proliferation assay, flow cytometry (apoptosis, cell cycle), JC-1 staining, ROS assay, mouse tumor xenograft\",\n      \"journal\": \"Journal of cancer research and clinical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined cellular and in vivo phenotype with pathway placement; single lab, multiple methods\",\n      \"pmids\": [\"30661098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GRX1 overexpression in osteoarthritis chondrocytes inhibits oxidative stress and apoptosis by upregulating CREB transcription factor activity, which increases HO-1 expression; this pathway was validated by showing that HO-1 downstream effects require CREB induction by GRX1.\",\n      \"method\": \"GRX1 overexpression, Western blot, RT-qPCR, MDA/SOD assay, annexin V/PI apoptosis assay, caspase-3 activity assay\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — overexpression with phenotype but limited direct mechanistic validation of CREB/HO-1 as direct substrates\",\n      \"pmids\": [\"28843170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Grx1 ablation leads to increased glutathionylation of HIF-1α, stabilizing HIF-1α and inducing VEGF-A production in lung tissue. Pharmacological inhibition of HIF-1α (YC-1) reversed these effects, establishing that Grx1 controls pulmonary angiogenesis through HIF-1α deglutathionylation.\",\n      \"method\": \"Grx1 KO mouse model, measurement of GSH-protein adducts, VEGF-A quantification, YC-1 pharmacological inhibition, histological analysis\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO + pharmacological rescue establishing HIF-1α glutathionylation as mechanistic link; single lab\",\n      \"pmids\": [\"36640422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Grx1 deficiency in mice causes spontaneous skeletal muscle atrophy associated with inhibition of p-AMPK and Sirt1 activity, leading to intramuscular lipid deposition and glucose utilization disorder; metformin treatment partially rescued this phenotype.\",\n      \"method\": \"Grx1 KO mouse model, Western blot for p-AMPK/Sirt1, lipid staining, glucose utilization assays, metformin rescue experiment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — KO phenotype with pathway placement but no direct mechanistic link between Grx1 and AMPK/Sirt1 established\",\n      \"pmids\": [\"33069361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CRISPR/Cas9-generated Grx1-deficient HeLaS3 cells show increased sensitivity to oxidative stress (γ-irradiation, heat shock, H2O2), with excessive accumulation of intracellular ROS, higher protein oxidation, elevated mitochondrial oxidants, increased cytochrome c release, and higher apoptosis rates, establishing Grx1's role in mitochondrial redox homeostasis.\",\n      \"method\": \"CRISPR/Cas9 KO, fluorescent ROS probe (DCFDA), Western blot for oxidized proteins/Prx2, MitoSox Red staining, annexin V/EthD-III apoptosis assay\",\n      \"journal\": \"Free radical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean CRISPR KO with multiple orthogonal readouts linking Grx1 to mitochondrial redox and apoptosis\",\n      \"pmids\": [\"32892658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human glutaredoxin gene (GLRX) was mapped to chromosomal region 5q14 by fluorescence in situ hybridization (FISH) and somatic cell hybrid analysis.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH), somatic cell hybrid panel analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromosomal localization by two independent methods\",\n      \"pmids\": [\"8838810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PEP-1-GRX-1 fusion protein transduced into human chondrocytes suppresses MMP-13 expression and nitric oxide production by inhibiting MAPK and NF-κB activation in IL-1β- and LPS-stimulated chondrocytes, and reduces carrageenan-induced paw edema in vivo.\",\n      \"method\": \"Protein transduction, Western blot for MAPK/NF-κB activation, RT-qPCR, mouse carrageenan paw edema model, immunohistochemistry\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional data with pathway placement but uses fusion protein, not endogenous Grx1; single lab\",\n      \"pmids\": [\"28214840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GRX1 regulates ferroptosis via the GRX1/GSK-3β/Nrf2 axis; GRX1 silencing or erastin treatment abolished the anti-ferroptotic effect of electroacupuncture in a mouse model of postoperative cognitive dysfunction.\",\n      \"method\": \"GRX1 silencing (siRNA), erastin treatment, Morris water maze, Western blot, RT-qPCR, MDA/GSH/iron level measurement, immunohistochemistry\",\n      \"journal\": \"Brain research bulletin\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — KD with phenotype and pathway placement, but indirect link between Grx1 and GSK-3β/Nrf2; single lab\",\n      \"pmids\": [\"39889835\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GLRX (Glutaredoxin 1) is a cytosolic/intermembrane space thiol-disulfide oxidoreductase that catalyzes reversible protein deglutathionylation (removal of protein-glutathione mixed disulfides), thereby regulating redox-sensitive signaling through substrates including AKT and HIF-1α, controlling NF-κB-dependent inflammation, and maintaining mitochondrial redox homeostasis and cell survival under oxidative stress; its mRNA stability is regulated by METTL3-mediated m6A modification downstream of NRF1 transcriptional activity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GLRX (glutaredoxin 1) is a thiol-disulfide oxidoreductase that catalyzes protein deglutathionylation, thereby serving as a central regulator of redox-sensitive signaling, inflammatory responses, and cell survival under oxidative stress. GLRX removes glutathione mixed disulfides from specific substrates including AKT, maintaining its phosphorylation and pro-survival signaling [PMID:25788646], and HIF-1α, whose glutathionylation-dependent stabilization drives VEGF-A production and pulmonary angiogenesis in GLRX-deficient mice [PMID:36640422]. GLRX loss increases global protein S-glutathionylation in vivo, attenuating NF-κB-dependent inflammatory signaling as demonstrated by reduced cigarette smoke-induced lung inflammation in Grx1 knockout mice [PMID:22723915], and sensitizes cells to oxidative stress through excessive mitochondrial ROS accumulation, cytochrome c release, and apoptosis [PMID:32892658]. GLRX mRNA stability is regulated by the NRF1–METTL3 axis via m6A modification in an IGF2BP2-dependent manner, linking transcriptional and epitranscriptomic control to neuronal redox protection [PMID:37735974].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Chromosomal localization of the human GLRX gene to 5q14 established its genomic identity, enabling subsequent functional studies.\",\n      \"evidence\": \"FISH and somatic cell hybrid analysis\",\n      \"pmids\": [\"8838810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional characterization at this stage\", \"No regulatory elements identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Determining that GRX1 localizes exclusively to the mitochondrial intermembrane space (while GRX2 resides in the matrix) established compartment-specific roles for glutaredoxin isoforms in mitochondrial redox regulation.\",\n      \"evidence\": \"Subcellular fractionation of mitochondria with Western blotting\",\n      \"pmids\": [\"17845131\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single fractionation approach without immunofluorescence confirmation\", \"Cytosolic pool not addressed in this study\", \"No functional consequences of compartmentalization tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Grx1 knockout mice showed that endogenous Grx1 is required for NF-κB-dependent inflammatory signaling in vivo, as its absence increased global protein S-glutathionylation and reduced cigarette smoke-induced lung inflammation.\",\n      \"evidence\": \"Grx1 KO mouse, cigarette smoke exposure, BALF cytokine/cell counting, PSSG immunoblotting\",\n      \"pmids\": [\"22723915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific NF-κB subunit glutathionylation sites not identified\", \"No reconstitution with catalytically dead Grx1 to confirm enzymatic requirement\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of AKT as a direct deglutathionylation substrate of Grx1 established a mechanistic link between Grx1 activity and pro-survival signaling through maintenance of AKT phosphorylation.\",\n      \"evidence\": \"Overexpression/siRNA knockdown in retinal pigment epithelial cells, immunoprecipitation with anti-PSSG antibody, phospho-AKT Western blot, apoptosis assay\",\n      \"pmids\": [\"25788646\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific glutathionylated cysteine residue on AKT not mapped\", \"In vivo validation of AKT deglutathionylation not performed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"GLRX inhibition sensitized EGFR-TKI-resistant NSCLC cells to gefitinib through ROS-mediated apoptosis and cell cycle arrest, placing GLRX in the EGFR/FoxM1 signaling axis relevant to drug resistance.\",\n      \"evidence\": \"siRNA knockdown, proliferation/apoptosis/cell cycle assays, mouse xenograft\",\n      \"pmids\": [\"30061098\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct deglutathionylation target in EGFR/FoxM1 pathway not identified\", \"No catalytic-dead rescue to confirm enzymatic mechanism\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"CRISPR-generated Grx1-null cells demonstrated that Grx1 is essential for mitochondrial redox homeostasis, as its loss caused excessive mitochondrial ROS, cytochrome c release, and apoptosis sensitivity to multiple oxidative stressors.\",\n      \"evidence\": \"CRISPR/Cas9 KO in HeLaS3, MitoSox Red, DCFDA, Western blot for oxidized proteins, annexin V apoptosis assay\",\n      \"pmids\": [\"32892658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific mitochondrial substrates responsible for phenotype not identified\", \"Rescue with IMS-targeted versus cytosolic Grx1 not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"HIF-1α was identified as a deglutathionylation target of Grx1, establishing that Grx1 controls pulmonary angiogenesis by preventing glutathionylation-dependent HIF-1α stabilization and VEGF-A induction.\",\n      \"evidence\": \"Grx1 KO mouse, GSH-protein adduct measurement, VEGF-A quantification, YC-1 pharmacological rescue\",\n      \"pmids\": [\"36640422\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific glutathionylated cysteine on HIF-1α not mapped\", \"Whether Grx1 acts on HIF-1α directly or through an intermediary not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The NRF1–METTL3–IGF2BP2 axis was shown to regulate GLRX mRNA stability via m6A modification, revealing an epitranscriptomic layer of Grx1 regulation with neuroprotective consequences.\",\n      \"evidence\": \"ChIP, RIP, MeRIP, dual luciferase assay, MPTP mouse model of Parkinson's disease\",\n      \"pmids\": [\"37735974\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific m6A sites on GLRX mRNA not mapped at nucleotide resolution\", \"Whether this regulatory axis operates in tissues beyond dopaminergic neurons is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A comprehensive substrate map for Grx1 deglutathionylation activity — including identification of specific cysteine residues on substrates like AKT and HIF-1α — and the structural basis for substrate selectivity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No proteome-wide identification of Grx1-dependent deglutathionylation sites\", \"No crystal structure of Grx1 bound to a glutathionylated substrate\", \"Relative contributions of cytosolic versus IMS pools to specific phenotypes not delineated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [1, 2, 6, 8]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [1, 2, 6, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 10]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"AKT1\",\n      \"HIF1A\",\n      \"METTL3\",\n      \"IGF2BP2\",\n      \"NRF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}