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Tao X, Mo L, Zeng L. Hyperoxia Induced Bronchopulmonary Dysplasia-Like Inflammation via miR34a-TNIP2-IL-1β Pathway. Front Pediatr 2022; 10:805860. [PMID: 35433535 PMCID: PMC9005975 DOI: 10.3389/fped.2022.805860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 03/07/2022] [Indexed: 11/15/2022] Open
Abstract
Lung injury induced by oxygen is a key contributor to the pathogenesis of preterm infant bronchopulmonary dysplasia (BPD). To date, there are comprehensive therapeutic strategy for this disease, but the underlying mechanism is still in progress. By using lentivirus, we constructed microRNA34a (miR34a)-overexpressing or knockdown A549 cell lines, and exposure to hyperoxia to mimic oxygen induce lung injury. In this study, we investigated 4 proinflammatory cytokines, interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α), angiopoietin-1 (Ang-1), and Cyclooxygenase-2 (COX-2) in the secreted sputum of infants who received mechanical ventilation, and found that IL-1β was substantially elevated in the first week after oxygen therapy and with no significant decrease until the fourth week, while TNF-α, Ang-1, and COX-2 were increased in the first week but decreased quickly in the following weeks. In addition, in vitro assay revealed that hyperoxia significantly increased the expression of miR-34a, which positively regulated the proinflammatory cytokine IL-1β in a time- and concentration-dependent manner in A549 cells. Overexpressing or knockdown miR34 would exacerbate or inhibit production of IL-1β and its upstream NOD-, LRR-, and pyrin domain-containing protein 3 (NLRP3) inflammasome signaling pathway. Mechanically, it's found that TNFAIP3 interacting protein 2 (TNIP2), an inhibitor of nuclear factor κB (NF-κB), is a direct target of miR34a, negatively regulated activation of NLRP3 inflammasome and the production of IL-1β. Overexpressing TNIP2 ameliorated hyperoxia-induced production of IL-1β and cell apoptosis. Our findings suggest that TNIP2 may be a potential clinical marker in the diagnosis of BPD.
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Affiliation(s)
- Xuwei Tao
- Department of Neonatology, Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Luxia Mo
- Department of Neonatology, Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lingkong Zeng
- Department of Neonatology, Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Jiao C, Zou J, Chen Z, Zheng F, Xu Z, Lin YH, Wang Q. Dietary Glutamine Inclusion Regulates Immune and Antioxidant System, as Well as Programmed Cell Death in Fish to Protect against Flavobacterium columnare Infection. Antioxidants (Basel) 2021; 11:44. [PMID: 35052548 PMCID: PMC8773122 DOI: 10.3390/antiox11010044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/23/2021] [Accepted: 12/24/2021] [Indexed: 01/07/2023] Open
Abstract
The susceptibility of animals to pathogenic infection is significantly affected by nutritional status. The present study took yellow catfish (Pelteobagrus fulvidraco) as a model to test the hypothesis that the protective roles of glutamine during bacterial infection are largely related to its regulation on the immune and antioxidant system, apoptosis and autophagy. Dietary glutamine supplementation significantly improved fish growth performance and feed utilization. After a challenge with Flavobacterium columnare, glutamine supplementation promoted il-8 and il-1β expression via NF-κB signaling in the head kidney and spleen, but inhibited the over-inflammation in the gut and gills. Additionally, dietary glutamine inclusion also enhanced the systematic antioxidant capacity. Histological analysis showed the protective role of glutamine in gill structures. Further study indicated that glutamine alleviated apoptosis during bacterial infection, along with the reduced protein levels of caspase-3 and the reduced expression of apoptosis-related genes. Moreover, glutamine also showed an inhibitory role in autophagy which was due to the increased activation of the mTOR signaling pathway. Thus, our study for the first time illustrated the regulatory roles of glutamine in the fish immune and antioxidant system, and reported its inhibitory effects on fish apoptosis and autophagy during bacterial infection.
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Affiliation(s)
- Congrui Jiao
- College of Fisheries, Huazhong Agricultural University, 1 Shizishan Street, Wuhan 430070, China; (C.J.); (J.Z.); (Z.C.); (F.Z.); (Z.X.)
| | - Jiahong Zou
- College of Fisheries, Huazhong Agricultural University, 1 Shizishan Street, Wuhan 430070, China; (C.J.); (J.Z.); (Z.C.); (F.Z.); (Z.X.)
| | - Zhenwei Chen
- College of Fisheries, Huazhong Agricultural University, 1 Shizishan Street, Wuhan 430070, China; (C.J.); (J.Z.); (Z.C.); (F.Z.); (Z.X.)
| | - Feifei Zheng
- College of Fisheries, Huazhong Agricultural University, 1 Shizishan Street, Wuhan 430070, China; (C.J.); (J.Z.); (Z.C.); (F.Z.); (Z.X.)
| | - Zhen Xu
- College of Fisheries, Huazhong Agricultural University, 1 Shizishan Street, Wuhan 430070, China; (C.J.); (J.Z.); (Z.C.); (F.Z.); (Z.X.)
| | - Yu-Hung Lin
- Department of Aquaculture, National Pingtung University of Science and Technology, 1 Shuefu Road, Neipu, Pingtung 912, Taiwan
| | - Qingchao Wang
- College of Fisheries, Huazhong Agricultural University, 1 Shizishan Street, Wuhan 430070, China; (C.J.); (J.Z.); (Z.C.); (F.Z.); (Z.X.)
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Yue L, Lu X, Dennery PA, Yao H. Metabolic dysregulation in bronchopulmonary dysplasia: Implications for identification of biomarkers and therapeutic approaches. Redox Biol 2021; 48:102104. [PMID: 34417157 PMCID: PMC8710987 DOI: 10.1016/j.redox.2021.102104] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 08/11/2021] [Accepted: 08/12/2021] [Indexed: 12/03/2022] Open
Abstract
Bronchopulmonary dysplasia (BPD) is a common chronic lung disease in premature infants. Accumulating evidence shows that dysregulated metabolism of glucose, lipids and amino acids are observed in premature infants. Animal and cell studies demonstrate that abnormal metabolism of these substrates results in apoptosis, inflammation, reduced migration, abnormal proliferation or senescence in response to hyperoxic exposure, and that rectifying metabolic dysfunction attenuates neonatal hyperoxia-induced alveolar simplification and vascular dysgenesis in the lung. BPD is often associated with several comorbidities, including pulmonary hypertension and neurodevelopmental abnormalities, which significantly increase the morbidity and mortality of this disease. Here, we discuss recent progress on dysregulated metabolism of glucose, lipids and amino acids in premature infants with BPD and in related in vivo and in vitro models. These findings suggest that metabolic dysregulation may serve as a biomarker of BPD and plays important roles in the pathogenesis of this disease. We also highlight that targeting metabolic pathways could be employed in the prevention and treatment of BPD.
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Affiliation(s)
- Li Yue
- Department of Orthopedics, Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI, USA
| | - Xuexin Lu
- Department of Pediatrics, Ascension St. John Hospital, Detroit, MI, USA
| | - Phyllis A Dennery
- Department of Molecular Biology, Cell Biology & Biochemistry, Division of Biology and Medicine, Brown University, Providence, RI, USA; Department of Pediatrics, Warren Alpert Medical School of Brown University, Providence, RI, USA
| | - Hongwei Yao
- Department of Molecular Biology, Cell Biology & Biochemistry, Division of Biology and Medicine, Brown University, Providence, RI, USA.
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Pavlova NN, King B, Josselsohn RH, Violante S, Macera VL, Vardhana SA, Cross JR, Thompson CB. Translation in amino-acid-poor environments is limited by tRNA Gln charging. eLife 2020; 9:62307. [PMID: 33289483 PMCID: PMC7744096 DOI: 10.7554/elife.62307] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 12/07/2020] [Indexed: 12/12/2022] Open
Abstract
An inadequate supply of amino acids leads to accumulation of uncharged tRNAs, which can bind and activate GCN2 kinase to reduce translation. Here, we show that glutamine-specific tRNAs selectively become uncharged when extracellular amino acid availability is compromised. In contrast, all other tRNAs retain charging of their cognate amino acids in a manner that is dependent upon intact lysosomal function. In addition to GCN2 activation and reduced total translation, the reduced charging of tRNAGln in amino-acid-deprived cells also leads to specific depletion of proteins containing polyglutamine tracts including core-binding factor α1, mediator subunit 12, transcriptional coactivator CBP and TATA-box binding protein. Treating amino-acid-deprived cells with exogenous glutamine or glutaminase inhibitors restores tRNAGln charging and the levels of polyglutamine-containing proteins. Together, these results demonstrate that the activation of GCN2 and the translation of polyglutamine-encoding transcripts serve as key sensors of glutamine availability in mammalian cells.
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Affiliation(s)
- Natalya N Pavlova
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Bryan King
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Rachel H Josselsohn
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Sara Violante
- The Donald B. and Catherine C. Marron Cancer Metabolism Center, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Victoria L Macera
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Santosha A Vardhana
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Justin R Cross
- The Donald B. and Catherine C. Marron Cancer Metabolism Center, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Craig B Thompson
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center, New York, United States
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Li Z, Chen Y, Li W, Yan F. Cell Division Cycle 2 Protects Neonatal Rats Against Hyperoxia-Induced Bronchopulmonary Dysplasia. Yonsei Med J 2020; 61:679-688. [PMID: 32734731 PMCID: PMC7393293 DOI: 10.3349/ymj.2020.61.8.679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 06/05/2020] [Accepted: 06/25/2020] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Hyperoxia-induced bronchopulmonary dysplasia (BPD) is a lung disease in preterm infants. We aimed to explore the role of cell division cycle 2 (CDC2) on histopathologic changes of lung tissues, as well as the viability, apoptosis, and inflammation of lung cells in rats with hyperoxia-induced BPD. MATERIALS AND METHODS Hyperoxia-induced BPD in neonatal rats and hyperoxia-induced A549 cells were constructed. The mRNA expression of CDC2 was detected by qRT-PCR. The fibrosis score of lung tissues was evaluated by hematoxylin-eosin staining. The viability and apoptosis of A549 cells were detected by cell counting kit-8 assay and flow cytometry. The protein expressions of bcl-2, bax, and caspase-3 were measured by western blot. The levels of tumor necrosis factor-α (TNF-α), interleukin (IL)-6, and IL-1β in A549 cells were detected by enzyme-linked immunosorbent assay. The pcDNA3.1-CDC2 was injected into rats to determine the role of CDC2 in hyperoxia-induced BPD in vivo. RESULTS The expression of CDC2 was decreased in lung tissues of neonatal rats with hyperoxia-induced BPD and hyperoxia-induced A549 cells. The fibrosis score was increased in the lung tissues of neonatal rats with hyperoxia-induced BPD. Overexpression of CDC2 increased the viability and protein expression of bcl-2; and inhibited the apoptosis, inflammation, and protein expression of bax and caspase-3 in hyperoxia-induced A549 cells. Up-regulation of CDC2 alleviated the histopathologic changes in lung tissues of neonatal rats with hyperoxia-induced BPD. CONCLUSION Overexpression of CDC2 promoted the viability and inhibited the apoptosis and inflammation of hyperoxia-induced cells, and alleviated the histopathologic changes of lung tissues in neonatal rats with hyperoxia-induced BPD.
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Affiliation(s)
- Zhongying Li
- Department of Pediatric, Binzhou People's Hospital, Binzhou, China
| | - Yanhong Chen
- Department of Pediatric Intensive Care, Binzhou People's Hospital, Binzhou, China
| | - Wenrong Li
- Department of Pediatric Neurology and Rehabilitation, Binzhou People's Hospital, Binzhou, China
| | - Fan Yan
- Department of Pediatric II, The First Hospital of Yulin City, Yulin, China.
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Type VI collagen promotes lung epithelial cell spreading and wound-closure. PLoS One 2018; 13:e0209095. [PMID: 30550606 PMCID: PMC6294368 DOI: 10.1371/journal.pone.0209095] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 11/29/2018] [Indexed: 11/25/2022] Open
Abstract
Basement membrane (BM) is an essential part of the extracellular matrix (ECM) that plays a crucial role in mechanical support and signaling to epithelial cells during lung development, homeostasis and repair. Abnormal composition and remodeling of the lung ECM have been associated with developmental abnormalities observed in multiple pediatric and adult respiratory diseases. Collagen VI (COL6) is a well-studied muscle BM component, but its role in the lung and its effect on pulmonary epithelium is largely undetermined. We report the presence of COLVI immediately subjacent to human airway and alveolar epithelium in the pediatric lung, in a location where it is likely to interact with epithelial cells. In vitro, both primary human lung epithelial cells and human lung epithelial cell lines displayed an increased rate of “wound healing” in response to a scratch injury when plated on COL6 as compared to other matrices. For the 16HBE cell line, wounds remained >5-fold larger for cells on COL1 (p<0.001) and >6-fold larger on matrigel (p<0.001), a prototypical basement membrane, when compared to COL6 (>96% closure at 10 hr). The effect of COL6 upon lung epithelial cell phenotype was associated with an increase in cell spreading. Three hours after initial plating, 16HBE cells showed >7-fold less spreading on matrigel (p<0.01), and >4-fold less spreading on COL1 (p<0.01) when compared to COL6. Importantly, the addition of COL6 to other matrices also enhanced cell spreading. Similar responses were observed for primary cells. Inhibitor studies indicated both integrin β1 activity and activation of multiple signaling pathways was required for enhanced spreading on all matrices, with the PI3K/AKT pathway (PI3K, CDC42, RAC1) showing both significant and specific effects for spreading on COL6. Genetic gain-of-function experiments demonstrated enhanced PI3K/AKT pathway activity was sufficient to confer equivalent cell spreading on other matrices as compared to COL6. We conclude that COL6 has significant and specific effects upon human lung epithelial cell-autonomous functions.
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Ma L, Zhou P, Neu J, Lin HC. Potential Nutrients for Preventing or Treating Bronchopulmonary Dysplasia. Paediatr Respir Rev 2017; 22:83-88. [PMID: 27843119 DOI: 10.1016/j.prrv.2016.08.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 08/01/2016] [Accepted: 08/29/2016] [Indexed: 10/21/2022]
Abstract
Bronchopulmonary dysplasia (BPD) is a frequent complication occurring in extremely preterm infants. Despite recent advances in newborn medicine, the incidence of BPD does not appear to have changed markedly, and specific treatments and prevention strategies are still lacking. Nutrition plays an important role in normal lung development and maturation. Malnutrition may delay somatic growth and new alveoli development, thus aggravating pulmonary injury involved in the pathogenesis of BPD. However, few nutrients have been investigated for their potential to mitigate the pathogenesis of BPD. In this article, we reviewed the recent progress in research on potential nutrients useful for the prevention or treatment of BPD, including glutamine, cysteine and N-acetylcysteine, L-arginine and L-citrulline, long chain polyunsaturated fatty acids (LCPUFAs), inositol, selenium, and some antioxidant vitamins including vitamin A. Current evidence shows that vitamin A and LCPUFA can prevent BPD, and that L-citrulline might provide a new method to treat chronic pulmonary hypertension associated with BPD in premature infants. The effects of other nutrients on BPD prevention need to be further studied.
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Affiliation(s)
- Liya Ma
- Department of Neonatology, Shenzhen Baoan Maternal and Child Health Hospital, China.
| | - Ping Zhou
- Department of Neonatology, Shenzhen Baoan Maternal and Child Health Hospital, China.
| | - Josef Neu
- Department of Pediatrics, University of Florida, U.S.A..
| | - Hung-Chih Lin
- Department of Pediatrics, Children's Hospital and School of Chinese Medicine, China Medical University, Taichung, Taiwan.
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Patel A, Zhang S, Moorthy B, Shivanna B. Omeprazole does not Potentiate Acute Oxygen Toxicity in Fetal Human Pulmonary Microvascular Endothelial Cells Exposed to Hyperoxia. ACTA ACUST UNITED AC 2015; 6. [PMID: 26779382 PMCID: PMC4712726 DOI: 10.4172/2153-2435.1000424] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Hyperoxia contributes to the pathogenesis of broncho-pulmonary dysplasia (BPD), which is a developmental lung disease of premature infants that is characterized by an interruption of lung alveolar and pulmonary vascular development. Omeprazole (OM) is a proton pump inhibitor that is used to treat humans with gastric acid related disorders. Earlier we observed that OM-mediated aryl hydrocarbon receptor (AhR) activation attenuates acute hyperoxic lung injury in adult mice and oxygen toxicity in adult human lung cells. However, our later studies in newborn mice demonstrated that OM potentiates hyperoxia-induced developmental lung injury. Whether OM exerts a similar toxicity in primary human fetal lung cells is unknown. Hence, we tested the hypothesis that OM potentiates hyperoxia-induced cytotoxicity and ROS generation in the human fetal lung derived primary human pulmonary microvascular endothelial cells (HPMEC). OM activated AhR as evident by a dose-dependent increase in cytochrome P450 (CYP) 1A1 mRNA levels in OM-treated cells. Furthermore, OM at a concentration of 100 μM (OM 100) increased NADP(H) quinone oxidoreductase 1 (NQO1) expression. Surprisingly, hyperoxia decreased rather than increase the NQO1 protein levels in OM 100-treated cells. Exposure to hyperoxia increased cytotoxicity and hydrogen peroxide (H2O2) levels. Interestingly, OM 100-treated cells exposed to air had increased H2O2 levels. However, hyperoxia did not further augment H2O2 levels in OM 100-treated cells. Additionally, hyperoxia-mediated oxygen toxicity was similar in both vehicle- and OM-treated cells. These findings contradict our hypothesis and support the hypothesis that OM does not potentiate acute hyperoxic injury in HPMEC in vitro.
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Affiliation(s)
- Ananddeep Patel
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Shaojie Zhang
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Bhagavatula Moorthy
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Binoy Shivanna
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
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Glutamine Reduces the Apoptosis of H9C2 Cells Treated with High-Glucose and Reperfusion through an Oxidation-Related Mechanism. PLoS One 2015; 10:e0132402. [PMID: 26146991 PMCID: PMC4493145 DOI: 10.1371/journal.pone.0132402] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 06/12/2015] [Indexed: 01/17/2023] Open
Abstract
Mitochondrial overproduction of reactive oxygen species (ROS) in diabetic hearts during ischemia/reperfusion injury and the anti-oxidative role of glutamine have been demonstrated. However, in diabetes mellitus the role of glutamine in cardiomyocytes during ischemia/reperfusion injury has not been explored. To examine the effects of glutamine and potential mechanisms, in the present study, rat cardiomyoblast H9C2 cells were exposed to high glucose (33 mM) and hypoxia-reoxygenation. Cell viability, apoptosis, intracellular glutamine, and mitochondrial and intracellular glutathione were determined. Moreover, ROS formation, complex I activity, membrane potential and adenosine triphosphate (ATP) content were also investigated. The levels of S-glutathionylated complex I and mitochondrial apoptosis-related proteins, including cytochrome c and caspase-3, were analyzed by western blot. Data indicated that high glucose and hypoxia-reoxygenation were associated with a dramatic decline of intercellular glutamine and increase in apoptosis. Glutamine supplementation correlated with a reduction in apoptosis and increase of glutathione and glutathione reduced/oxidized ratio in both cytoplasm and mitochondria, but a reduction of intracellular ROS. Glutamine supplementation was also associated with less S-glutathionylation and increased the activity of complex I, leading to less mitochondrial ROS formation. Furthermore, glutamine supplementation prevented from mitochondrial dysfunction presented as mitochondrial membrane potential and ATP levels and attenuated cytochrome c release into the cytosol and caspase-3 activation. We conclude that apoptosis induced by high glucose and hypoxia-reoxygenation was reduced by glutamine supplementation, via decreased oxidative stress and inactivation of the intrinsic apoptotic pathway.
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Zhang S, Patel A, Chu C, Jiang W, Wang L, Welty SE, Moorthy B, Shivanna B. Aryl hydrocarbon receptor is necessary to protect fetal human pulmonary microvascular endothelial cells against hyperoxic injury: Mechanistic roles of antioxidant enzymes and RelB. Toxicol Appl Pharmacol 2015; 286:92-101. [PMID: 25831079 DOI: 10.1016/j.taap.2015.03.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 03/10/2015] [Accepted: 03/19/2015] [Indexed: 02/03/2023]
Abstract
Hyperoxia contributes to the development of bronchopulmonary dysplasia (BPD) in premature infants. Activation of the aryl hydrocarbon receptor (AhR) protects adult and newborn mice against hyperoxic lung injury by mediating increases in the expression of phase I (cytochrome P450 (CYP) 1A) and phase II (NADP(H) quinone oxidoreductase (NQO1)) antioxidant enzymes (AOE). AhR positively regulates the expression of RelB, a component of the nuclear factor-kappaB (NF-κB) protein that contributes to anti-inflammatory processes in adult animals. Whether AhR regulates the expression of AOE and RelB, and protects fetal primary human lung cells against hyperoxic injury is unknown. Therefore, we tested the hypothesis that AhR-deficient fetal human pulmonary microvascular endothelial cells (HPMEC) will have decreased RelB activation and AOE, which will in turn predispose them to increased oxidative stress, inflammation, and cell death compared to AhR-sufficient HPMEC upon exposure to hyperoxia. AhR-deficient HPMEC showed increased hyperoxia-induced reactive oxygen species (ROS) generation, cleavage of poly(ADP-ribose) polymerase (PARP), and cell death compared to AhR-sufficient HPMEC. Additionally, AhR-deficient cell culture supernatants displayed increased macrophage inflammatory protein 1α and 1β, indicating a heightened inflammatory state. Interestingly, loss of AhR was associated with a significantly attenuated CYP1A1, NQO1, superoxide dismutase 1(SOD1), and nuclear RelB protein expression. These findings support the hypothesis that decreased RelB activation and AOE in AhR-deficient cells is associated with increased hyperoxic injury compared to AhR-sufficient cells.
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Affiliation(s)
- Shaojie Zhang
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Ananddeep Patel
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Chun Chu
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Weiwu Jiang
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Lihua Wang
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Stephen E Welty
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Bhagavatula Moorthy
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA
| | - Binoy Shivanna
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, USA.
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Prise en charge nutritionnelle au cours du syndrome de détresse respiratoire de l’adulte. MEDECINE INTENSIVE REANIMATION 2014. [DOI: 10.1007/s13546-014-0847-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Arginyl-glutamine dipeptide or docosahexaenoic acid attenuate hyperoxia-induced lung injury in neonatal mice. Nutrition 2013; 28:1186-91. [PMID: 23044165 DOI: 10.1016/j.nut.2012.04.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/27/2012] [Accepted: 04/28/2012] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Supplementation studies of glutamine, arginine, and docosahexaenoic acid (DHA) have established the safety of each of these nutrients in neonates. However, the potential for a more stable and soluble dipeptide, arginyl-glutamine (Arg-Gln) or DHA, a long-chain ω-3 fatty acid with anti-inflammatory properties, to exert benefits on hyperoxia-induced lung injury has not to our knowledge been investigated. The aim of this study was to investigate whether Arg-Gln dipeptide or DHA could attenuate markers of injury and inflammation in neonatal mouse lungs exposed to hyperoxia. METHODS Seven-day-old mouse pups were placed with their dams in 75% oxygen for 5 d. After 5 d of hyperoxic exposure (postnatal days 7-12), pups were removed from hyperoxia and allowed to recover in atmospheric conditions for 5 d (postnatal days 12-17). Mouse pups received Arg-Gln (5 g · kg⁻¹ · d⁻¹) or DHA (5 g · kg⁻¹ · d⁻¹) or saline orally from postnatal days 12 through 17. Histologic changes, myeloperoxidase, lactate dehydrogenase, inflammatory cytokines, and nuclear factor-κB inhibitor levels were checked in each group. RESULTS The Arg-Gln and DHA prevented the development of key markers of injury, including histologic changes, myeloperoxidase, lactate dehydrogenase, and inflammatory cytokines interleukin-6 and C-X-C motif ligand 1 (CXCL1)/keratinocyte-derived chemokine (KC). The highly beneficial effects of Arg-Gln on the reversal of oxygen-induced lung damage was associated with restoration of levels of nuclear factor-κB inhibitor. CONCLUSION The Arg-Gln and DHA, with protective effects on hyperoxic lung injury in neonatal mice, are promising nutritional adjuncts that may prevent lung damage owing to oxygen toxicity in infants.
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Yang H, Xu Z, Liu W, Wei Y, Deng Y, Xu B. Effect of grape seed proanthocyanidin extracts on methylmercury-induced neurotoxicity in rats. Biol Trace Elem Res 2012; 147:156-64. [PMID: 22116679 DOI: 10.1007/s12011-011-9272-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 11/13/2011] [Indexed: 10/15/2022]
Abstract
As a highly toxic environmental pollutant, methylmercury (MeHg) can cause neurotoxicity in animals and humans. Considering the antioxidant property of grape seed proanthocyanidin extracts (GSPE), this study was aimed to evaluate the effect of GSPE on MeHg-induced neurotoxicity in rats. Rats were exposed to MeHg by intraperitoneal injection (4, 12 μmol/kg, respectively) and GSPE was administered by gavage (250 mg/kg) 2 h later. After a 4-week treatment, phosphate-activated glutaminase, glutamine synthetase, glutathione peroxidase and superoxide dismutase activities, glutamate, glutamine, malondialdehyde and glutathione contents in cerebral cortex were measured. Reactive oxygen species (ROS) and apoptosis were also estimated in cells. The results showed that the MeHg-induced neurotoxicity was significantly attenuated. GSPE significantly decreased the production of ROS, counteracted oxidative damage and increased the antioxidants and antioxidant enzymes activities in rats prior to MeHg exposure. Moreover, the effects on the rate of apoptotic cells and the disturbance of glutamate homeostasis were correspondingly modulated. These observations highlighted the potential of GSPE in offering protection against MeHg-induced neurotoxicity.
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Affiliation(s)
- Haibo Yang
- Department of Environmental Health, School of Public Health, China Medical University, Shenyang, China
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14
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Phosphate-activated glutaminase (GLS2), a p53-inducible regulator of glutamine metabolism and reactive oxygen species. Proc Natl Acad Sci U S A 2010; 107:7461-6. [PMID: 20351271 DOI: 10.1073/pnas.1002459107] [Citation(s) in RCA: 492] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We identified a p53 target gene, phosphate-activated mitochondrial glutaminase (GLS2), a key enzyme in conversion of glutamine to glutamate, and thereby a regulator of glutathione (GSH) synthesis and energy production. GLS2 expression is induced in response to DNA damage or oxidative stress in a p53-dependent manner, and p53 associates with the GLS2 promoter. Elevated GLS2 facilitates glutamine metabolism and lowers intracellular reactive oxygen species (ROS) levels, resulting in an overall decrease in DNA oxidation as determined by measurement of 8-OH-dG content in both normal and stressed cells. Further, siRNA down-regulation of either GLS2 or p53 compromises the GSH-dependent antioxidant system and increases intracellular ROS levels. High ROS levels following GLS2 knockdown also coincide with stimulation of p53-induced cell death. We propose that GLS2 control of intracellular ROS levels and the apoptotic response facilitates the ability of p53 to protect cells from accumulation of genomic damage and allows cells to survive after mild and repairable genotoxic stress. Indeed, overexpression of GLS2 reduces the growth of tumor cells and colony formation. Further, compared with normal tissue, GLS2 expression is reduced in liver tumors. Thus, our results provide evidence for a unique metabolic role for p53, linking glutamine metabolism, energy, and ROS homeostasis, which may contribute to p53 tumor suppressor function.
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Perng WC, Huang KL, Li MH, Hsu CW, Tsai SH, Chu SJ, Chang DM. Glutamine attenuates hyperoxia-induced acute lung injury in mice. Clin Exp Pharmacol Physiol 2010; 37:56-61. [DOI: 10.1111/j.1440-1681.2009.05239.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Glutamine homeostasis and mitochondrial dynamics. Int J Biochem Cell Biol 2009; 41:2051-61. [PMID: 19703661 DOI: 10.1016/j.biocel.2009.03.003] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 03/09/2009] [Accepted: 03/10/2009] [Indexed: 11/21/2022]
Abstract
Glutamine is a multifaceted amino acid that plays key roles in many metabolic pathways and also fulfils essential signaling functions. Although classified as non-essential, recent evidence suggests that glutamine is a conditionally essential amino acid in several physiological situations. Glutamine homeostasis must therefore be exquisitely regulated and mitochondria represent a major site of glutamine metabolism in numerous cell types. Glutaminolysis is mostly a mitochondrial process with repercussions in organelle structure and dynamics suggesting a tight and mutual control between mitochondrial form and cell bioenergetics. In this review we describe an updated account focused on the critical involvement of glutamine in oxidative stress, mitochondrial dysfunction and tumour cell proliferation, with special emphasis in the initial steps of mitochondrial glutamine pathways: transport into the organelle and hydrolytic deamidation through glutaminase enzymes. Some controversial issues about glutamine catabolism within mitochondria are also reviewed.
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Morrow DMP, Entezari-Zaher TE, Romashko J, Azghani AO, Javdan M, Ulloa L, Miller EJ, Mantell LL. Antioxidants preserve macrophage phagocytosis of Pseudomonas aeruginosa during hyperoxia. Free Radic Biol Med 2007; 42:1338-49. [PMID: 17395007 PMCID: PMC3104269 DOI: 10.1016/j.freeradbiomed.2007.01.031] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2006] [Revised: 01/13/2007] [Accepted: 01/17/2007] [Indexed: 11/29/2022]
Abstract
Pseudomonas. aeruginosa (PA) is a leading cause of nosocomial pneumonia in patients receiving mechanical ventilation with hyperoxia. Exposure to supraphysiological concentrations of reactive oxygen species during hyperoxia may result in macrophage damage that reduces their ability to phagocytose PA. We tested this hypothesis in cultured macrophage-like RAW 264.7 cells and alveolar macrophages from mice exposed to hyperoxia. Exposure to hyperoxia induced a similarly impaired phagocytosis of both the mucoid and the nonmucoid forms of PA in alveolar macrophages and RAW cells. Compromised PA phagocytosis was associated with cytoskeleton disorganization and actin oxidation in hyperoxic macrophages. To test whether moderate concentrations of O(2) limit the loss of phagocytic function induced by > or =95% O(2), mice and RAW cells were exposed to 65% O(2). Interestingly, although the resulting lung injury/cell proliferation was not significant, exposure to 65% O(2) resulted in a marked reduction in PA phagocytosis that was comparable to that of > or =95% O(2). Treatment with antioxidants, even post hyperoxic exposure, preserved actin cytoskeleton organization and phagocytosis of PA. These data suggest that hyperoxia reduces macrophage phagocytosis through effects on actin functions which can be preserved by antioxidant treatment. In addition, administration of moderate rather than higher concentrations of O2 does not improve macrophage phagocytosis of PA.
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Affiliation(s)
- Dympna M. P. Morrow
- Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, Queens, NY 11439
- Cardiopulmonary Research, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Tahereh E. Entezari-Zaher
- Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, Queens, NY 11439
- Cardiopulmonary Research, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - John Romashko
- Cardiopulmonary Research, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Ali O. Azghani
- Department of Speciality Care Services, The University of Texas Health Center, Tyler, TX
| | - Mohammad Javdan
- Cardiopulmonary Research, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Luis Ulloa
- Laboratory of Biomedical Science, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Edmund J. Miller
- Surgercal Immunology, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Lin L. Mantell
- Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, Queens, NY 11439
- Cardiopulmonary Research, North Shore University Hospital/The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
- Correspondence author: Lin L. Mantell, Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, 108/SB28 St. Albert Hall, 8000 Utopia Parkway, Queens, New York 11439, Tel: 718-990-5933, Fax: 718-990-1877,
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Abstract
Nutrition plays a critical role in the prevention and management of bronchopulmonary dysplasia (BPD). Growth failure in infants with BPD is predominantly due to malnutrition. Malnutrition can worsen BPD by compromising lung growth. Feeding difficulties in these infants can further affect nutrition. Dexamethasone, used to facilitate extubation and treat severe BPD, is known to have adverse effects on growth. Nutritional management of very low birth weight (VLBW) infants should be addressed from the first day of life to enhance growth and minimize respiratory morbidity. Fluid restriction, parenteral nutrition with protein and lipids, and early enteral feeding may help decrease the incidence of BPD. High calorie concentrated formula can be used in infants to achieve adequate growth if total daily fluid intake is restricted. Vitamin A supplementation may help to prevent further damage to lungs. The role of such therapies as inositol, vitamin E, and selenium in management of these infants remains speculative. Close post discharge follow up of infants with BPD is necessary to monitor growth and to ensure intake of sufficient protein and calories.
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Affiliation(s)
- Manoj A Biniwale
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT 06520, USA
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Tonomura H, Takahashi KA, Mazda O, Arai Y, Inoue A, Terauchi R, Shin-Ya M, Kishida T, Imanishi J, Kubo T. Glutamine protects articular chondrocytes from heat stress and NO-induced apoptosis with HSP70 expression. Osteoarthritis Cartilage 2006; 14:545-53. [PMID: 16480901 DOI: 10.1016/j.joca.2005.12.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2005] [Accepted: 12/21/2005] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate the effect of l-glutamine (Gln) on stress responses of chondrocytes exposed to heat stress or nitric oxide (NO). METHODS Cultures of articular chondrocytes were established from rabbit joints, and treated for 12h with various concentrations of Gln (0-20 mM). In some experiments, cells were also treated with quercetin (Que), a heat shock protein 70 (HSP70) inhibitor. Heat stress (43 degrees C) was applied to the cells for 0-120 min. Apoptosis was induced by 0.5mM sodium nitroprusside (SNP) dihydrate that produces NO. After stress loading, HSP70 expression was detected by Western blot analysis. Cell viability was assessed by lactate dehydrogenase (LDH) release and tetrazolium salt-based assays, while apoptosis was evaluated by Hoechst 33342 staining, TUNEL methods and active caspase-3 determination. RESULTS Gln demonstrated dose-dependent enhancing effect on stress-mediated induction of HSP70, while in the absence of any stress HSP70 was not induced by Gln alone. After heating or SNP loading, chondrocytes showed severe reduction in viability, while the cytotoxic outcome was almost completely abrogated by conditioning with Gln. The protective effect of Gln was significantly blocked by Que that effectively suppressed stress-induced HSP70 expression in chondrocytes. The Gln also rendered chondrocytes unsusceptible to NO-induced apoptosis that was frequently seen in SNP-treated culture. CONCLUSION This study demonstrated that the treatment of chondrocytes with Gln protected the cells from heat stress and NO-induced apoptosis. These chondroprotective effects of Gln may be mediated by HSP70.
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Affiliation(s)
- H Tonomura
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kyoto 602-8566, Japan
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Nyunoya T, Monick MM, Powers LS, Yarovinsky TO, Hunninghake GW. Macrophages Survive Hyperoxia via Prolonged ERK Activation Due to Phosphatase Down-regulation. J Biol Chem 2005; 280:26295-302. [PMID: 15901735 DOI: 10.1074/jbc.m500185200] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Macrophages exposed to hyperoxia in the lung continue to survive for prolonged periods. We previously reported (Nyunoya, T., Powers, L. S., Yarovinsky, T. O., Butler, N. S., Monick, M. M., and Hunninghake, G. W. (2003) J. Biol. Chem. 278, 36099-36106) that hyperoxia induces cell cycle arrest and sustained extracellular signal-related kinase (ERK) activity in macrophages. In this study, we determined the mechanisms of hyperoxia-induced ERK activation and how ERK activity plays a pro-survival role in hyperoxia-exposed cells. Inhibition of ERK activity decreased survival of hyperoxia-exposed macrophages. This was due, at least in part, to down-regulation of the pro-apoptotic Bcl-2 family member, BimEL. In determining the mechanism of ERK activation by hyperoxia, we found that ERK activation was not associated with hyperoxia-induced activation of the upstream ERK kinase mitogen-activated protein kinase/extracellular signal-regulated kinase kinase 1/2. When we examined the ability of whole cell lysates from hyperoxia-exposed cells to dephosphorylate purified phosphorylated ERK, we found decreased ERK-directed phosphatase activity. Two particular ERK-directed phosphatases (protein phosphatase 2A and MAPK phosphatase-3) demonstrated decreased activity in hyperoxia-exposed cells. Moreover, whole cell lysates from normoxia-exposed cells depleted of PP2A or MAPK phosphatase-3 were also less able to dephosphorylate ERK. These data demonstrate that, in hyperoxia-exposed macrophages, sustained activation of ERK due to phosphatase down-regulation permits macrophage survival via effects on the balance between pro- and anti-apoptotic Bcl-2 family proteins.
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Affiliation(s)
- Toru Nyunoya
- Division of Pulmonary, Critical Care, and Occupational Medicine, University of Iowa Roy J. and Lucille A. Carver College of Medicine, Iowa City, Iowa 52242, USA.
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Lora J, Alonso FJ, Segura JA, Lobo C, Márquez J, Matés JM. Antisense glutaminase inhibition decreases glutathione antioxidant capacity and increases apoptosis in Ehrlich ascitic tumour cells. ACTA ACUST UNITED AC 2004; 271:4298-306. [PMID: 15511236 DOI: 10.1111/j.1432-1033.2004.04370.x] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Glutamine is an essential amino acid in cancer cells and is required for the growth of many other cell types. Glutaminase activity is positively correlated with malignancy in tumours and with growth rate in normal cells. In the present work, Ehrlich ascites tumour cells, and their derivative, 0.28AS-2 cells, expressing antisense glutaminase mRNA, were assayed for apoptosis induced by methotrexate and hydrogen peroxide. It is shown that Ehrlich ascites tumour cells, expressing antisense mRNA for glutaminase, contain lower levels of glutathione than normal ascites cells. In addition, 0.28AS-2 cells contain a higher number of apoptotic cells and are more sensitive to both methotrexate and hydrogen peroxide toxicity than normal cells. Taken together, these results provide insights into the role of glutaminase in apoptosis by demonstrating that the expression of antisense mRNA for glutaminase alters apoptosis and glutathione antioxidant capacity.
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Affiliation(s)
- Jorge Lora
- Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, Spain
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