AQP9 Drives Myocardial Ferroptosis via TRIM25-Mediated GPX4 Ubiquitination and PI3K/AKT Suppression
Ontology highlight
ABSTRACT:
ORGANISM(S): Rattus Norvegicus
SUBMITTER: 
Jianye Yang
PROVIDER: PXD079978 | iProX | Mon Jun 22 00:00:00 BST 2026
REPOSITORIES: iProX
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Project description:GPX4-dependent ferroptosis has emerged as a therapeutic strategy for cancer treatment. Here, we demonstrated that protein kinase A (PKA) participates in the regulation of ferroptosis by controlling the m6A modification of GPX4 in an ALKBH5-dependent manner. Notably, we identified ALKBH5, an m6A demethylase, as a novel target of PKA, which drives phosphorylation-dependent degradation of ALKBH5 protein. Moreover, the deletion of ALKBH5 represses ferroptotic cell death by maintaining GPX4 m6A modification and stability. Thus, by regulating ALKBH5-dependent GPX4 stability, PKA acts as a key regulator of ferroptosis. Our study unveils the involvement of PKA in m6A modification, which could control GPX4-dependent ferroptosis and tumor progression.
2025-12-09 | GSE283869 | GEO
Project description:Comparative analysis of gene expression in cultured primary keratinocytes isolated from newborn control (K14-cre; GPx4fl/+) and knockout (K14-cre; GPx4fl/fl) mice. Selenoproteins are essential for skin function, as targeted abolition of selenoproteins in epidermal tissue results in newborn mice manifesting gross abnormalities of skin and hair, accompanied by retarded growth and premature death. To investigate whether lack of a single selenoprotein could induce similar phenotypic effect in mice, we generated keratinocyte-specific knockout mice lacking glutathione peroxidase 4 (GPx4), an essential selenoprotein in skin, to examine phenotypic changes resulting from the lack of GPx4 in skin. Ablation of GPx4 results in focal alopecia and disturbed hair follicle morphogenesis, with GPx4 being essential during early stages of hair follicle morphogenesis as well as for keratinocyte adhesion and proliferation in culture. We have generated mice with selective removal of the GPx4 gene in keratinocytes under the control of Keratin-14-cre (K14-cre) promoter. Comparative microarray analysis was performed on RNA samples taken from pooled primary keratinocytes from knockout and control mice from the same litter. Array replicates were performed using RNA samples from three different litters.
2012-12-06 | E-GEOD-34215 | biostudies-arrayexpress
Project description:Ferroptosis has emerged as a therapeutic vulnerability in hepatocellular carcinoma, but its interplay with antioxidant defense remains incompletely understood. Here, we investigated whether Tamarixetin induces ferroptotic stress in hepatoma cells and how nuclear factor erythroid 2-related factor 2 (NRF2) signaling responds to this process. Tamarixetin selectively reduced hepatoma cell viability, increased lipid peroxidation, and these effects were partially rescued by ferrostatin-1. Transcriptome analysis revealed enrichment of ferroptosis- and glutathione metabolism-related pathways, highlighting redox-associated genes centered on the SLC7A11–glutathione peroxidase 4 (GPX4) axis. Tamarixetin also increased NRF2 target gene expression, indicating activation of a compensatory antioxidant response to oxidative stress. Molecular docking further suggested a potential interaction between Tamarixetin and the xCT transporter. These findings identify Tamarixetin as a modulator of ferroptotic stress in hepatoma cells and support redox-targeting strategies for liver cancer.
2026-05-11 | GSE327198 | GEO
Project description:Background In the ongoing battle against BCR-ABL+ leukemia, despite significant advances with tyrosine kinase inhibitors (TKIs), the persistent challenges of drug resistance and the enduring presence of leukemic stem cells (LSCs) remain formidable barriers to achieving a cure. Methods In this study, we demonstrated that Disulfiram (DSF) induces ferroptosis to synergize with TKIs in inhibiting BCR-ABL+ cells, particularly targeting resistant cells and LSCs, using cell models, mouse models, and primary cells from patients. We elucidated the mechanism by which DSF promotes GPX4 degradation to induce ferroptosis through immunofluorescence, co-immunoprecipitation (CO-IP), RNA sequencing, lipid peroxidation assays, and rescue experiments. Results Here, we present compelling evidence elucidating the sensitivity of DSF, an FDA-approved drug for alcohol dependence, towards BCR-ABL+ cells. Our findings underscore DSF's ability to selectively induce a potent cytotoxic effect on BCR-ABL+ cell lines and effectively inhibit primary BCR-ABL+ leukemia cells. Crucially, the combined treatment of DSF with TKIs selectively eradicates TKI-insensitive stem cells and resistant cells. Of particular note is DSF's capacity to disrupt GPX4 stability, elevate the labile iron pool, and intensify lipid peroxidation, ultimately leading to ferroptotic cell death. Our investigation shows that BCR-ABL expression induces alterations in cellular iron metabolism and increases GPX4 expression. Additionally, we demonstrate the indispensability of GPX4 for LSC development and the initiation/maintenance of BCR-ABL+ leukemia. Mechanical analysis further elucidates DSF's ability to circumvent resistance by reducing GPX4 levels through the disruption of its binding with HSPA8, thereby promoting GPX4 ubiquitination and subsequent degradation. Furthermore, the combined treatment of DSF with TKIs effectively targets both BCR-ABL+ blast cells and drug-insensitive LSCs, conferring a significant survival advantage in mouse models. Conclusion In summary, the dual inhibition of GPX4 and BCR-ABL presents a promising therapeutic strategy to synergistically target blast cells and drug-insensitive LSCs in patients, offering potential avenues for advancing leukemia treatment.
2024-09-05 | GSE276122 | GEO
Project description:Analysis of proteins interacting with GPX4 in A375 and 293T cells infected with lentiviruses encoding empty vector or Flag-GPX4, using anti-Flag magnetic beads enrichment and LC-MS/MS.
2024-12-19 | PXD051448 | Pride
Project description:Autistic individuals with disproportionate megalencephaly (ASD-DM), characterized by enlarged brains relative to body height, have higher rates of intellectual disability and face more severe cognitive challenges than autistic children with average brain sizes. The cellular and molecular mechanisms underlying this neurophenotype remain poorly understood. To investigate these mechanisms, we generated human induced pluripotent stem cells from non-autistic typically developing children and autistic children with and without disproportionate megalencephaly. We assessed these children longitudinally from ages two to twelve years using magnetic resonance imaging and comprehensive cognitive and medical evaluations. We show that neural progenitor cells (NPCs) derived from ASD-DM children exhibit increased rates of cell survival and suppressed cell death, accompanied by heightened oxidative stress and ferrous iron accumulation. Despite these stressors, ASD-DM NPCs actively suppress apoptosis and ferroptosis by regulating proteins such as caspase-3 (CASP3), poly(ADP-ribose) polymerase 1 (PARP1), and glutathione peroxidase 4 (GPX4). Cellular ferroptotic signatures are further supported by elevated expression of selenocysteine genes, including GPX4, in the blood of ASD-DM children and their mothers, suggesting potential hereditary or environmental influences. Furthermore, we show that peripheral expression of GPX4 and other selenocysteine genes correlate with cognitive outcomes (IQ). These findings underscore the role of ferroptosis in autism, pointing to potential diagnostic biomarkers and targets for intervention.
2026-06-01 | GSE290910 | GEO
Project description:Ferroptosis is an iron-dependent programmed cell death associated with severe kidney diseases, linked to decreased glutathione peroxidase 4 (GPX4). However, the spatial distribution of renal GPX4-mediated ferroptosis and the molecular events causing GPX4 reduction during ischemia-reperfusion (I/R) remain largely unknown. Using spatial transcriptomics, we identify that GPX4 is situated at the interface of the inner cortex and outer medulla, a hyperactive ferroptosis site post-I/R injury. We show that OTU deubiquitinase 5 (OTUD5) is a GPX4-binding protein that confers ferroptosis resistance by stabilizing GPX4. During I/R, ferroptosis is induced by mTORC1-mediated autophagy, causing OTUD5 degradation and subsequent GPX4 decay. Functionally, OTUD5 deletion intensifies renal tubular cell ferroptosis and exacerbates acute kidney injury, while AAV-mediated OTUD5 delivery mitigates ferroptosis and promotes renal function recovery from I/R injury. In this work, our study highlights a new autophagy-dependent ferroptosis module: hypoxia/ischemia-induced OTUD5 autophagy triggers GPX4 degradation, offering a potential therapeutic avenue for I/R-related kidney diseases.
2023-11-29 | GSE244330 | GEO
Project description:Comparative analysis of gene expression in cultured primary keratinocytes isolated from newborn control (K14-cre; GPx4fl/+) and knockout (K14-cre; GPx4fl/fl) mice. Selenoproteins are essential for skin function, as targeted abolition of selenoproteins in epidermal tissue results in newborn mice manifesting gross abnormalities of skin and hair, accompanied by retarded growth and premature death. To investigate whether lack of a single selenoprotein could induce similar phenotypic effect in mice, we generated keratinocyte-specific knockout mice lacking glutathione peroxidase 4 (GPx4), an essential selenoprotein in skin, to examine phenotypic changes resulting from the lack of GPx4 in skin. Ablation of GPx4 results in focal alopecia and disturbed hair follicle morphogenesis, with GPx4 being essential during early stages of hair follicle morphogenesis as well as for keratinocyte adhesion and proliferation in culture.
2012-12-06 | GSE34215 | GEO
Project description:To elucidate the molecular mechanisms by which GPX4 regulates mitochondrial function, we overexpressed GPX4 in cardiomyocytes and subjected them to hypoxia-reoxygenation (H/R) modeling. Co-immunoprecipitation (Co-IP) coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) was employed to identify potential partners of GPX4.
2025-12-22 | PXD072382 |
Project description:Cadmium (Cd) is a toxic heavy metal that has a significant impact on the liver and kidneys, rendering them highly susceptible to its toxic effects. However, the precise mechanism remains uncertain. Mice were exposed to Cd resulting severe ferroptosis and liver tissue damage via regulating hepatic GPX4 levels. It is noteworthy that despite the considerably lower concentration of Cd in the kidney compared to the liver, the oxidative damage observed in the exposed mice was significantly more severe in the kidney. It was therefore postulated that hepatic disorders may engage in such hepatorenal communication, thereby leading to the pathological phenotypes of distant organs under conditions of Cd exposure. The results of the mechanistic studies indicated that Cd-induced hepatocyte exosomes, which contain a variety of miRNAs produced by hepatocytes, such as miR-2137, etc., are capable of targeting renal GPX4 and reducing the level of GPX4 in renal cells. This resulted in the occurrence of ferroptosis in the kidneys. Injection of the appropriate dosage of Cd-induced exosomes, derived from hepatocytes, is sufficient to induce kidney damage in vivo. Our data support the hypothesis that treatment with an antagomir targeting miR-2137 is capable of inhibiting this process. Moreover, our findings revealed that selenium (Se) supplementation was sufficient to protect against Cd-induced hepatic and renal toxicity by elevating the expression level of selenoprotein GPX4 in vivo. In conclusion, we have identified liver-derived exosomes and their implications for hepatorenal communication under Cd exposure. This provides a new target for understanding the mechanism of Cd-induced hepatorenal communication. Our findings indicate that exosomes may serve as biomarkers and potential therapeutic agents for the exposure of Cd toxicity.
2025-07-17 | GSE302882 | GEO