RNA-sequencing and Exome-sequencing analysis of ferroptosis-resistant 786-O GPX4-null carcinoma cells following in vivo selection
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE148297 | GEO | 2020/09/16
REPOSITORIES: GEO
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Project description:RNA-sequencing and Exome-sequencing analysis of ferroptosis-resistant 786-O GPX4-null carcinoma cells following in vivo selection
| PRJNA623805 | ENA
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:Invariant natural killer T (iNKT) cells are a group of innate like T cells that plays important roles in immune homeostasis and activation. We found that iNKT cells, compared to CD4+ T cells, have significantly higher levels of lipid peroxidation in both mice and humans. Proteomic analysis also demonstrated that iNKT cells express higher levels of Glutathione peroxidase 4 (Gpx4), a major antioxidant enzyme that reduces lipid peroxidation and prevents ferroptosis. T cell specific deletion of Gpx4 reduces iNKT cell population, most prominently the IFNg producing NKT1 subset. RNAseq analysis revealed IFNg signaling, cell cycle regulation, as well as mitochondrial function are perturbed by Gpx4 deletion in iNKT cells. Consistently, we detected impaired cytokine production, elevated cell proliferation and cell death, and accumulation of lipid peroxides and mitochondrial ROS in Gpx4 KO iNKT cells. Ferroptosis inhibitor, iron chelator, vitamin E and vitamin K2 can prevent ferroptosis induced by Gpx4 deficiency in iNKT cells and ameliorate the impaired function of iNKT cells due to Gpx4 inhibition. Lastly, vitamin E rescued iNKT cell population in Gpx4 KO mice. Altogether, our findings reveal the critical role of Gpx4 in regulating iNKT cell homeostasis and function, through controlling lipid peroxidation and ferroptosis.
2024-08-20 | GSE270485 | GEO
Project description:Glutathione peroxidase 4 (GPX4) utilizes glutathione (GSH) to detoxify lipid peroxidation and
plays an essential role in inhibiting ferroptosis. As a selenoprotein, GPX4 protein synthesis is
highly inefficient and energetically costly. How cells coordinate GPX4 synthesis with nutrient
availability remains unclear. In this study, integrated proteomic and functional analyses reveal
that SLC7A11-mediated cystine uptake promotes not only GSH synthesis but also GPX4 protein synthesis. Mechanistically, cyst(e)ine activates mechanistic/mammalian target of rapamycin complex 1 (mTORC1) and promotes GPX4 protein synthesis at least partly through the mTORC1-4E-BP signaling axis. Pharmacologic inhibition of mTORC1 decreases GPX4 protein levels, sensitizes cancer cells to ferroptosis, and synergizes with ferroptosis inducers (FINs) to suppress patient-derived xenograft tumor growth in vivo. Together, our results reveal a hitherto unrecognized regulatory mechanism to coordinate GPX4 protein synthesis with cyst(e)ine availability and suggest to use the combination of mTORC1 inhibitors and FINs in cancer treatment.
2020-08-25 | MSV000086009 | MassIVE
Project description:Background: Intestinal failure-associated liver disease (IFALD) is a common complication of long-term parenteral nutrition (PN) that is associated with significant morbidity and mortality. Ferroptosis, as an iron-dependent regulated cell death, has been shown to play an important role in the development of several liver diseases. This study focuses on investigating whether the ferroptosis phenomenon is present in TPN-induced IFALD and further exploring the potential regulatory mechanisms. Methods: Ferroptosis hallmarkers were measured in children with short bowel syndrome (SBS) who had long-term PN use and caused IFALD. Sprague-Dawley (SD) rats were used to establish a rat model of IFALD with a concomitant ferroptosis inhibition intervention using liproxstain-1. The mir-431 lineage was identified as a potential upstream regulatory mir-RNA by mir-RNA sequencing. HepG2 and 293T cell line was used to demonstrate that mir-431 regulates ferroptosis through the GPX4 pathway at the cellular level in vitro. Results: Ferroptosis is upregulated in liver of children with IFALD. Liproxstain-1 downregulates ferroptosis in a rat model of IFALD and attenuates hepatic steatosis through the lipid metabolism pathway. In vitro HepG2 and 293T cell experiments reveal that mir-431 affects ferroptosis by regulating GPX4 protein. Conclusions: Ferroptosis plays an important role in the development of IFALD. Liproxstain-1 inhibits ferroptosis and attenuates hepatic steatosis in a rat model of IFALD through the lipid metabolism pathway. Mir-431 negatively regulates GPX4 protein-induced ferroptosis.
2024-01-01 | GSE223895 | GEO
Project description:Purpose: Identification of Gpx4-dependent genes in resting and activated Treg cells Methods: RNA was purified from resting of stimulated (aCD3-CD38 for 4 h) splenic Treg cells sorted from WT or Foxp3CreGpx4fl/fl mice Conclusions: Gpx4 prevents lipid peroxidation and ferroptosis of activated Treg cells..
2021-10-31 | GSE160338 | GEO
Project description:Breast cancer represents the most prevalent form of malignant tumors among women. Despite the existence of numerous therapeutic methods, a significant portion of patients face a poor prognosis, highlighting the urgency in identifying new remedial targets. Here, we for the first time demonstrated that the CP2 family member TFCP2L1, a classical marker of embryonic stem cell maintenance, as a tumor suppressor in breast cancer. Patients with breast cancer have poorer prognoses when TFCP2L1 is expressed highly. Consistently, the expression of TFCP2L1 is higher in normal breast cells than those in breast cancer cell lines. Gain- and loss-of-function and xenograft tumor assay showed that overexpression of TFCP2L1 significantly inhibited both the proliferation and migration of breast cancer cells in vivo and in vitro. Conversely, the knockdown of TFCP2L1 promoted the proliferation and migration of breast cancer cells. Mechanistically, we found that TFCP2L1 suppresses breast cancer progression by directly inhibiting the expression of glutathione peroxidase 4 (GPX4), a key regulator of ferroptosis. Therefore, inhibition of GPX4 by RSL3, an inducer of ferroptosis was able to promote the function of TFCP2L1 in breast cancer cells. On the other hand, transcriptome high-throughput exhibited that TFCP2L1 negatively regulated the activity of PI3K/AKT signaling pathway. Administration of SC79, an AKT activator, was capable of partially restoring the negative effects of TFCP2L1 on GPX4 transcription. Together, TFCP2L1 functions by directly or indirectly regulating GPX4-mediated ferroptosis, and may serve as a novel biomarker and potential therapeutic target for breast cancer.
2024-07-30 | GSE270578 | GEO
Project description:Ferroptosis is a recently identified program of regulated cell death, defined by excessive accumulation of hydroperoxy-arachidonoyl (C20:4)- or adrenoyl (C22:4)- phosphatidyl-ethanolamine (OOH-PE). The selenium-dependent glutathione peroxidase 4 (GPX4) inhibits ferroptosis, converting unstable ferroptotic lipid hydroperoxides to non-toxic lipid alcohols. The effect of GPX4 ablation is divergent among cells and tissues, suggesting that additional regulators may guard trophoblasts against ferroptosis. While placental oxidative stress and lipotoxicity are hallmarks of placental dysfunction, the possible role of ferroptosis in placental function has not been hitherto investigated. Here we found that placental dysfunction is associated with ferroptosis, and that inhibition of GPX4 causes trophoblast injury and ferroptosis in vitro and in vivo during mouse pregnancy. Importantly, we uncover a role for the phospholipase PLA2G6 (PNPLA9, iPLA2beta), known to metabolizes OOH-PE to lyso-PE and oxidized fatty acid, in mitigating ferroptosis induced by GPX4 inhibition in vitro or by hypoxia-reoxygenation injury in vivo. Together, we identified ferroptosis in the human and mouse placenta, and established a novel role for PLA2G6 in attenuating trophoblastic ferroptosis. Our data provide mechanistic insights to the ill-defined entity of placental lipotoxicity, and may inspire new therapeutic strategies that target PLA2G6 as a means to modulate ferroptosis in placental and non-placental tissue.
2020-09-27 | GSE147625 | GEO
Project description:Background: Autologous fat grafting is hampered by unpredictable graft survival, which is potentially regulated by ferroptosis. Glutathione (GSH), a powerful antioxidant used in tissue preservation, has ferroptosis-regulating activity; however, its effects on fat grafts are unclear. This study investigated the effects and mechanisms of GSH in fat graft survival. Methods: Human lipoaspirates were transplanted subcutaneously into the backs of normal saline-treated (control) or GSH-treated nude mice. Graft survival was evaluated by magnetic resonance imaging and histology. RNA sequencing was performed to identify differentially expressed genes and enriched pathways. GSH activity was evaluated in vitro using an oxygen and glucose deprivation (OGD) model of adipose-derived stem cells. Results: Compared with control group, GSH induced better outcomes, including superior graft retention, appearance, and histological structures. RNA sequencing suggested enhanced negative regulation of ferroptosis in the GSH-treated grafts, which showed reduced lipid peroxides, better mitochondrial ultrastructure, and SLC7A11/GPX4 axis activation. In vitro, OGD-induced ferroptosis was ameliorated by GSH, which restored cell proliferation, reduced oxidative stress, and upregulated ferroptosis defense factors. Conclusions: Our study confirms that ferroptosis participates in regulating fat graft survival and that GSH exerts a protective effect by inhibiting ferroptosis. GSH-assisted lipotransfer is a promising therapeutic strategy for future clinical application.
2023-05-08 | GSE231511 | GEO
Project description:COPD patients are largely asymptomatic until later stages when prognosis is generally poor. Here, by shifting the focus forward to pre-COPD and smoking stages, we found the peak of reactive oxygen species (ROS) level and hypoxia character are enriched in pre-COPD samples, and hypoxia inducible factor (HIF)-3α is the key factor. Smoking induced regional tissue hypoxia and emphysema have been found in COPD patients. However, the mechanisms underlying hypoxia especially HIF-3α and COPD have not been investigated. In this study, by leveraging scRNA-seq and EpCAM co-localization analysis we identified HIF-3α is downregulated in alveolar epithelial cells in COPD. In vitro experiments using lentivirus transfection, bulk-RNA seq and RSL3 we found the activation of HIF-3α-GPx4 axis inhibits alveolar epithelial cell ferroptosis under the treatment of cigarettes smoking extracts (CSE). Further results from SftpcCreert2/+R26LSL-Hif3a knock-in mice demonstrated overexpression of HIF-3α inhibits alveolar epithelial cells ferroptosis and prevents the declining of lung function. Our data suggest the activation of HIF-3α-GPx4 axis prevents COPD by inhibiting alveolar epithelial cells ferroptosis. By leveraging this comprehensive analysis method, more promising treatment targets will be found and enhance our understanding to the pathogenesis.
2024-10-09 | GSE275503 | GEO