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Cao Y, Shu W, Jin P, Li J, Zhu H, Chen X, Zhu Y, Huang X, Cheng W, Shen Y. NAD metabolism-related genes provide prognostic value and potential therapeutic insights for acute myeloid leukemia. Front Immunol 2024; 15:1417398. [PMID: 38966636 PMCID: PMC11222388 DOI: 10.3389/fimmu.2024.1417398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Accepted: 06/05/2024] [Indexed: 07/06/2024] Open
Abstract
Introduction Acute myeloid leukemia (AML) is an aggressive blood cancer with high heterogeneity and poor prognosis. Although the metabolic reprogramming of nicotinamide adenine dinucleotide (NAD) has been reported to play a pivotal role in the pathogenesis of acute myeloid leukemia (AML), the prognostic value of NAD metabolism and its correlation with the immune microenvironment in AML remains unclear. Methods We utilized our large-scale RNA-seq data on 655 patients with AML and the NAD metabolism-related genes to establish a prognostic NAD metabolism score based on the sparse regression analysis. The signature was validated across three independent datasets including a total of 1,215 AML patients. ssGSEA and ESTIMATE algorithms were employed to dissect the tumor immune microenvironment. Ex vivo drug screening and in vitro experimental validation were performed to identify potential therapeutic approaches for the high-risk patients. In vitro knockdown and functional experiments were employed to investigate the role of SLC25A51, a mitochondrial NAD+ transporter gene implicated in the signature. Results An 8-gene NAD metabolism signature (NADM8) was generated and demonstrated a robust prognostic value in more than 1,800 patients with AML. High NADM8 score could efficiently discriminate AML patients with adverse clinical characteristics and genetic lesions and serve as an independent factor predicting a poor prognosis. Immune microenvironment analysis revealed significant enrichment of distinct tumor-infiltrating immune cells and activation of immune checkpoints in patients with high NADM8 scores, acting as a potential biomarker for immune response evaluation in AML. Furthermore, ex vivo drug screening and in vitro experimental validation in a panel of 9 AML cell lines demonstrated that the patients with high NADM8 scores were more sensitive to the PI3K inhibitor, GDC-0914. Finally, functional experiments also substantiated the critical pathogenic role of the SLC25A51 in AML, which could be a promising therapeutic target. Conclusion Our study demonstrated that NAD metabolism-related signature can facilitate risk stratification and prognosis prediction in AML and guide therapeutic decisions including both immunotherapy and targeted therapies.
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MESH Headings
- Humans
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/diagnosis
- Leukemia, Myeloid, Acute/therapy
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/immunology
- Prognosis
- NAD/metabolism
- Tumor Microenvironment/immunology
- Tumor Microenvironment/genetics
- Biomarkers, Tumor/genetics
- Female
- Male
- Middle Aged
- Gene Expression Regulation, Leukemic
- Gene Expression Profiling
- Transcriptome
- Cell Line, Tumor
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Affiliation(s)
- Yuncan Cao
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenjing Shu
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Peng Jin
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jianfeng Li
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Hongming Zhu
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xinjie Chen
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yongmei Zhu
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xi Huang
- Department of Critical Care Medicine, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Wenyan Cheng
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yang Shen
- Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Findlay S, Nair R, Merrill RA, Kaiser Z, Cajelot A, Aryanpour Z, Heath J, St-Louis C, Papadopoli D, Topisirovic I, St-Pierre J, Sebag M, Kesarwala AH, Hulea L, Taylor EB, Shanmugam M, Orthwein A. The mitochondrial pyruvate carrier complex potentiates the efficacy of proteasome inhibitors in multiple myeloma. Blood Adv 2023; 7:3485-3500. [PMID: 36920785 PMCID: PMC10362273 DOI: 10.1182/bloodadvances.2022008345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 02/27/2023] [Accepted: 03/02/2023] [Indexed: 03/16/2023] Open
Abstract
Multiple myeloma (MM) is a hematological malignancy that emerges from antibody-producing plasma B cells. Proteasome inhibitors, including the US Food and Drug Administration-approved bortezomib (BTZ) and carfilzomib (CFZ), are frequently used for the treatment of patients with MM. Nevertheless, a significant proportion of patients with MM are refractory or develop resistance to this class of inhibitors, which represents a significant challenge in the clinic. Thus, identifying factors that determine the potency of proteasome inhibitors in MM is of paramount importance to bolster their efficacy in the clinic. Using genome-wide CRISPR-based screening, we identified a subunit of the mitochondrial pyruvate carrier (MPC) complex, MPC1, as a common modulator of BTZ response in 2 distinct human MM cell lines in vitro. We noticed that CRISPR-mediated deletion or pharmacological inhibition of the MPC complex enhanced BTZ/CFZ-induced MM cell death with minimal impact on cell cycle progression. In fact, targeting the MPC complex compromised the bioenergetic capacity of MM cells, which is accompanied by reduced proteasomal activity, thereby exacerbating BTZ-induced cytotoxicity in vitro. Importantly, we observed that the RNA expression levels of several regulators of pyruvate metabolism were altered in advanced stages of MM for which they correlated with poor patient prognosis. Collectively, this study highlights the importance of the MPC complex for the survival of MM cells and their responses to proteasome inhibitors. These findings establish mitochondrial pyruvate metabolism as a potential target for the treatment of MM and an unappreciated strategy to increase the efficacy of proteasome inhibitors in the clinic.
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Affiliation(s)
- Steven Findlay
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Division of Experimental Medicine, McGill University, Montreal, Canada
| | - Remya Nair
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, GA
| | - Ronald A. Merrill
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA
| | - Zafir Kaiser
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Department of Biochemistry, McGill University, Montreal, Canada
| | - Alexandre Cajelot
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Polytech Nice-Sophia, Université Côte d’Azur, Sophia Antipolis, Nice, France
| | - Zahra Aryanpour
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
| | - John Heath
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Division of Experimental Medicine, McGill University, Montreal, Canada
| | - Catherine St-Louis
- Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
- Ottawa Institute of Systems Biology, Ottawa, Canada
| | - David Papadopoli
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Gerald Bronfman Department of Oncology, McGill University, Montreal, Canada
| | - Ivan Topisirovic
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Division of Experimental Medicine, McGill University, Montreal, Canada
- Gerald Bronfman Department of Oncology, McGill University, Montreal, Canada
- Department of Biochemistry, McGill University, Montreal, Canada
| | - Julie St-Pierre
- Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
- Ottawa Institute of Systems Biology, Ottawa, Canada
| | - Michael Sebag
- The Research Institute of the McGill University Health Center, Montreal, Canada
| | - Aparna H. Kesarwala
- Department of Radiation Oncology, Winship Cancer Institute, Emory University, Atlanta, GA
| | - Laura Hulea
- Maisonneuve-Rosemont Hospital Research Center, Montreal, Canada
- Département de Biochimie et médecine moléculaire, Université de Montréal, Montreal, Canada
- Département de Médecine, Université de Montréal, Montreal, Canada
| | - Eric B. Taylor
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA
| | - Mala Shanmugam
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, GA
| | - Alexandre Orthwein
- Lady Davis Institute for Medical Research, Segal Cancer Centre, Jewish General Hospital, Montreal, Canada
- Division of Experimental Medicine, McGill University, Montreal, Canada
- Gerald Bronfman Department of Oncology, McGill University, Montreal, Canada
- Department of Radiation Oncology, Winship Cancer Institute, Emory University, Atlanta, GA
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Trovato FM, Mujib S, Jerome E, Cavazza A, Morgan P, Smith J, Depante MT, O'Reilly K, Luxton J, Mare T, Napoli S, McPhail MJ. Immunometabolic analysis shows a distinct cyto-metabotype in Covid-19 compared to sepsis from other causes. Heliyon 2022; 8:e09733. [PMID: 35774516 PMCID: PMC9225950 DOI: 10.1016/j.heliyon.2022.e09733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 03/28/2022] [Accepted: 06/10/2022] [Indexed: 12/15/2022] Open
Abstract
Background In Covid-19, profound systemic inflammatory responses are accompanied by both metabolic risk factors for severity and, separately, metabolic mechanisms have been shown to underly disease progression. It is unknown whether this reflects similar situations in sepsis or is a unique characteristic of Covid-19. Aims Define the immunometabolic signature of Covid-19. Methods 65 patients with Covid-19,19 patients with sepsis and 14 healthy controls were recruited and sampled for plasma, serum and peripheral blood mononuclear cells (PBMCs) through 10 days of critical illness. Metabotyping was performed using the Biocrates p180 kit and multiplex cytokine profiling undertaken. PBMCs underwent phenotyping by flow cytometry. Immune and metabolic readouts were integrated and underwent pathway analysis. Results Phopsphatidylcholines (PC) are reduced in Covid-19 but greater than in sepsis. Compared to controls, tryptophan is reduced in Covid-19 and inversely correlated with the severity of the disease and IFN-ɣ concentrations, conversely the kyneurine and kyneurine/tryptophan ratio increased in the most severe cases. These metabolic changes were consistent through 2 pandemic waves in our centre. PD-L1 expression in CD8+ T cells, Tregs and CD14+ monocytes was increased in Covid-19 compared to controls. Conclusions In our cohort, Covid-19 is associated with monocytopenia, increased CD14+ and Treg PD-L1 expression correlating with IFN-ɣ plasma concentration and disease severity (SOFA score). The latter is also associated with metabolic derangements of Tryptophan, LPC 16:0 and PCs. Lipid metabolism, in particular phosphatidylcholines and lysophosphatidylcolines, seems strictly linked to immune response in Covid-19. Our results support the hypothesis that IFN-ɣ -PD-L1 axis might be involved in the cytokine release syndrome typical of severe Covid-19 and the phenomenon persisted through multiple pandemic waves despite use of immunomodulation.
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Affiliation(s)
- Francesca M Trovato
- Institute of Liver Studies, King's College Hospital, London, United Kingdom.,Department of Inflammation BIology, School of Immunology & Microbial Sciences, Faculty of Life Sciences and Medicine, Kings College London, United Kingdom
| | - Salma Mujib
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - Ellen Jerome
- Institute of Liver Studies, King's College Hospital, London, United Kingdom.,Department of Inflammation BIology, School of Immunology & Microbial Sciences, Faculty of Life Sciences and Medicine, Kings College London, United Kingdom
| | - Anna Cavazza
- Institute of Liver Studies, King's College Hospital, London, United Kingdom.,Department of Inflammation BIology, School of Immunology & Microbial Sciences, Faculty of Life Sciences and Medicine, Kings College London, United Kingdom
| | - Phillip Morgan
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - John Smith
- Anaesthetics, Critical Care, Emergency and Trauma Research Delivery Unit, Kings College Hospital, London, United Kingdom
| | - Maria Theresa Depante
- Anaesthetics, Critical Care, Emergency and Trauma Research Delivery Unit, Kings College Hospital, London, United Kingdom
| | - Kevin O'Reilly
- Anaesthetics, Critical Care, Emergency and Trauma Research Delivery Unit, Kings College Hospital, London, United Kingdom
| | - James Luxton
- Contract R&D Department (Viapath), Kings College Hospital, London, United Kingdom
| | - Tracey Mare
- Contract R&D Department (Viapath), Kings College Hospital, London, United Kingdom
| | - Salvatore Napoli
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - Mark Jw McPhail
- Institute of Liver Studies, King's College Hospital, London, United Kingdom.,Department of Inflammation BIology, School of Immunology & Microbial Sciences, Faculty of Life Sciences and Medicine, Kings College London, United Kingdom
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4
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The metabolic reprogramming in acute myeloid leukemia patients depends on their genotype and is a prognostic marker. Blood Adv 2021; 5:156-166. [PMID: 33570627 DOI: 10.1182/bloodadvances.2020002981] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 11/12/2020] [Indexed: 12/19/2022] Open
Abstract
Leukemic cells display some alterations in metabolic pathways, which play a role in leukemogenesis and in patients' prognosis. To evaluate the characteristics and the impact of this metabolic reprogramming, we explore the bone marrow samples from 54 de novo acute myeloid leukemia (AML) patients, using an untargeted metabolomics approach based on proton high-resolution magic angle spinning-nuclear magnetic resonance. The spectra obtained were subjected to multivariate statistical analysis to find specific metabolome alterations and biomarkers correlated to clinical features. We found that patients display a large diversity of metabolic profiles, according to the different AML cytologic subtypes and molecular statuses. The link between metabolism and molecular status was particularly strong for the oncometabolite 2-hydroxyglutarate (2-HG), whose intracellular production is directly linked to the presence of isocitrate dehydrogenase mutations. Moreover, patients' prognosis was strongly impacted by several metabolites, such as 2-HG that appeared as a good prognostic biomarker in our cohort. Conversely, deregulations in phospholipid metabolism had a negative impact on prognosis through 2 main metabolites (phosphocholine and phosphoethanolamine), which could be potential aggressiveness biomarkers. Finally, we highlighted an overexpression of glutathione and alanine in chemoresistant patients. Overall, our results demonstrate that different metabolic pathways could be activated in leukemic cells according to their phenotype and maturation levels. This confirms that metabolic reprogramming strongly influences prognosis of patients and underscores a particular role of certain metabolites and associated pathways in AML prognosis, suggesting common mechanisms developed by leukemic cells to maintain their aggressiveness even after well-conducted induction chemotherapy.
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5
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Tian Y, Du W, Cao S, Wu Y, Dong N, Wang Y, Xu Y. Systematic analyses of glutamine and glutamate metabolisms across different cancer types. CHINESE JOURNAL OF CANCER 2017; 36:88. [PMID: 29116024 PMCID: PMC5678792 DOI: 10.1186/s40880-017-0255-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 10/26/2017] [Indexed: 12/23/2022]
Abstract
BACKGROUND Glutamine and glutamate are known to play important roles in cancer biology. However, no detailed information is available in terms of their levels of involvement in various biological processes across different cancer types, whereas such knowledge could be critical for understanding the distinct characteristics of different cancer types. Our computational study aimed to examine the functional roles of glutamine and glutamate across different cancer types. METHODS We conducted a comparative analysis of gene expression data of cancer tissues versus normal control tissues of 11 cancer types to understand glutamine and glutamate metabolisms in cancer. Specifically, we developed a linear regression model to assess differential contributions by glutamine and/or glutamate to each of seven biological processes in cancer versus control tissues. RESULTS While our computational predictions were consistent with some of the previous observations, multiple novel predictions were made: (1) glutamine is generally not involved in purine synthesis in cancer except for breast cancer, and is similarly not involved in pyridine synthesis except for kidney cancer; (2) glutamine is generally not involved in ATP production in cancer; (3) glutamine's contribution to nucleotide synthesis is minimal if any in cancer; (4) glutamine is not involved in asparagine synthesis in cancer except for bladder and lung cancers; and (5) glutamate does not contribute to serine synthesis except for bladder cancer. CONCLUSIONS We comprehensively predicted the roles of glutamine and glutamate metabolisms in selected metabolic pathways in cancer tissues versus control tissues, which may lead to novel approaches to therapeutic development targeted at glutamine and/or glutamate metabolism. However, our predictions need further functional validation.
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Affiliation(s)
- Yuan Tian
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
| | - Wei Du
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Sha Cao
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Yue Wu
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Ning Dong
- The First Hospital, Jilin University, Changchun, 130012 Jilin P. R. China
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Yan Wang
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
| | - Ying Xu
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
- College of Public Health, Jilin University, Changchun, 130012 Jilin P. R. China
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
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Cardaci S, Rizza S, Filomeni G, Bernardini R, Bertocchi F, Mattei M, Paci M, Rotilio G, Ciriolo MR. Glutamine deprivation enhances antitumor activity of 3-bromopyruvate through the stabilization of monocarboxylate transporter-1. Cancer Res 2012; 72:4526-36. [PMID: 22773663 DOI: 10.1158/0008-5472.can-12-1741] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Anticancer drug efficacy might be leveraged by strategies to target certain biochemical adaptations of tumors. Here we show how depriving cancer cells of glutamine can enhance the anticancer properties of 3-bromopyruvate, a halogenated analog of pyruvic acid. Glutamine deprival potentiated 3-bromopyruvate chemotherapy by increasing the stability of the monocarboxylate transporter-1, an effect that sensitized cells to metabolic oxidative stress and autophagic cell death. We further elucidated mechanisms through which resistance to chemopotentiation by glutamine deprival could be circumvented. Overall, our findings offer a preclinical proof-of-concept for how to employ 3-bromopyruvate or other monocarboxylic-based drugs to sensitize tumors to chemotherapy.
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Affiliation(s)
- Simone Cardaci
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome, Italy
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Holecek M. Adverse effects of chronic intake of glutamine-supplemented diet on amino acid concentrations and protein metabolism in rat: Effect of short-term starvation. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.eclnm.2011.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Brasse-Lagnel C, Lavoinne A, Husson A. Control of mammalian gene expression by amino acids, especially glutamine. FEBS J 2009; 276:1826-44. [PMID: 19250320 DOI: 10.1111/j.1742-4658.2009.06920.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Molecular data rapidly accumulating on the regulation of gene expression by amino acids in mammalian cells highlight the large variety of mechanisms that are involved. Transcription factors, such as the basic-leucine zipper factors, activating transcription factors and CCAAT/enhancer-binding protein, as well as specific regulatory sequences, such as amino acid response element and nutrient-sensing response element, have been shown to mediate the inhibitory effect of some amino acids. Moreover, amino acids exert a wide range of effects via the activation of different signalling pathways and various transcription factors, and a number of cis elements distinct from amino acid response element/nutrient-sensing response element sequences were shown to respond to changes in amino acid concentration. Particular attention has been paid to the effects of glutamine, the most abundant amino acid, which at appropriate concentrations enhances a great number of cell functions via the activation of various transcription factors. The glutamine-responsive genes and the transcription factors involved correspond tightly to the specific effects of the amino acid in the inflammatory response, cell proliferation, differentiation and survival, and metabolic functions. Indeed, in addition to the major role played by nuclear factor-kappaB in the anti-inflammatory action of glutamine, the stimulatory role of activating protein-1 and the inhibitory role of C/EBP homology binding protein in growth-promotion, and the role of c-myc in cell survival, many other transcription factors are also involved in the action of glutamine to regulate apoptosis and intermediary metabolism in different cell types and tissues. The signalling pathways leading to the activation of transcription factors suggest that several kinases are involved, particularly mitogen-activated protein kinases. In most cases, however, the precise pathways from the entrance of the amino acid into the cell to the activation of gene transcription remain elusive.
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Affiliation(s)
- Carole Brasse-Lagnel
- Appareil Digestif, Environnement et Nutrition, EA 4311, Université de Rouen, France
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9
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Thébault S, Deniel N, Marion R, Charlionet R, Tron F, Cosquer D, Leprince J, Vaudry H, Ducrotté P, Déchelotte P. Proteomic analysis of glutamine-treated human intestinal epithelial HCT-8 cells under basal and inflammatory conditions. Proteomics 2006; 6:3926-37. [PMID: 16739128 DOI: 10.1002/pmic.200500714] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Glutamine (Gln) promotes intestinal growth and maintains gut structure and function, especially in situations of injury and during inflammation. Several mechanisms could contribute to Gln protective effects on gut. Proteomics enable us to characterize differentially expressed proteins in tissues in response to modifications of the biological or nutritional environment. Gln effects on the human intestinal epithelial HCT-8 cell line proteome were assessed under basal and proinflammatory conditions. The 2-DE gels were obtained and compared. Proteins were identified by MS and using databases. About 1200 spots were detected in both 2- and 10-mM Gln concentrations. Under basal conditions, 24 proteins were differentially expressed in response to Gln. Half of these proteins were implicated in protein biosynthesis or proteolysis and 20% in membrane trafficking. Under proinflammatory conditions, 27 proteins were up- or down-regulated by Gln 10 mM. From these proteins, 40% were involved in protein biosynthesis or proteolysis, 16% in membrane trafficking, 8% in cell cycle and apoptosis mechanisms and 8% in nucleic acid metabolism. This study provides the first holistic picture of proteome modulation by Gln in a human enterocytic cell line under basal and proinflammatory conditions, and supports further evaluation of nutritional modulation of intestinal proteome in humans.
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Affiliation(s)
- Sandrine Thébault
- Groupe ADEN EA3234, Université de Rouen, IFR 23, 22 Boulevard Gambetta, 76183 Rouen, France
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10
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Eliasen MM, Brabec M, Gerner C, Pollheimer J, Auer H, Zellner M, Weingartmann G, Garo F, Roth E, Oehler R. Reduced stress tolerance of glutamine-deprived human monocytic cells is associated with selective down-regulation of Hsp70 by decreased mRNA stability. J Mol Med (Berl) 2005; 84:147-58. [PMID: 16308684 DOI: 10.1007/s00109-005-0004-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2005] [Accepted: 09/09/2005] [Indexed: 10/25/2022]
Abstract
In critically ill patients, clinicians observe a reverse correlation of survival and a decreased plasma concentration of the most abundant free amino acid, glutamine (Gln). However, in this context, the role of Gln remains largely elusive. Gln is used as an energy substrate by monocytes. Gln deprivation of these cells results in an increased susceptibility to cell stress and apoptosis, as well as in a reduced responsiveness to pro-inflammatory stimuli. We performed a systematic study to elucidate the molecular mechanism by which Gln depletion affects the heat stress response of the monocytic cell line U937. Proteomic analysis revealed that Gln depletion was associated with specific changes in the protein expression pattern. However, the overall level of tRNA-bound Gln remained unaffected. The stress protein heat shock protein (Hsp) 70 showed the highest reduction in protein synthesis. This was due to enhanced mRNA decay during Gln starvation while the transcriptional and the translational control of Hsp70 expression remained unchanged. A physiological Gln concentration and above was found to be necessary for maximum Hsp70 accumulation upon heat shock. Thus, the study shows a specific link between Gln metabolism and the regulation of heat shock proteins.
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Affiliation(s)
- Maja Munk Eliasen
- Department of Surgery-Research Laboratories, Medical University of Vienna, AKH (8G9.05), Waehringer-Guertel 18-20, 1090, Vienna, Austria.
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11
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Fuchs BC, Bode BP. Stressing out over survival: glutamine as an apoptotic modulator. J Surg Res 2005; 131:26-40. [PMID: 16154153 DOI: 10.1016/j.jss.2005.07.013] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Revised: 04/12/2005] [Accepted: 07/10/2005] [Indexed: 12/11/2022]
Abstract
INTRODUCTION The amino acid glutamine (GLN) has received considerable attention as a potential therapeutic adjuvant in critical illness and in improving postoperative clinical outcomes. Most studies on the role of GLN in cellular physiology have historically focused on its anabolic roles in specific cell types and its contribution to growth in cancer cells. However, an emerging body of work that examines the consequences of GLN deprivation on cellular survival and gene expression has constructed a new paradigm for this amino acid, namely, that limited extracellular GLN supplies modulate stress and apoptotic responses. METHODS A survey of the scientific literature was conducted on GLN in cell survival signaling and apoptosis. Work from our laboratory in liver cancer cells also was included in this review. RESULTS Most studies on this topic have used mammalian cell lines derived from the gut, immune system (including hybridomas), and various cancers. GLN limitation, even in the presence of an adequate glucose supply, impacts stress-related gene expression, differentially modulates receptor-mediated apoptosis, and directly elicits apoptosis through signaling mechanisms and caspase cascades that are specific to cell type. To date, GLN transporters, cellular hydration, glutaminyl-tRNA synthetase, ATP levels, mRNA stability, and glutathione economy have been variably implicated in GLN-dependent survival signaling. CONCLUSION The cell type-specific mechanisms underlying the regulatory role of GLN in cell survival continue to unfold at a steady pace through in vitro studies. These results have collectively provided testable hypotheses for further in vivo studies into their physiological relevance during GLN "nutritional pharmacology."
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Affiliation(s)
- Bryan C Fuchs
- Department of Biology, Saint Louis University, St. Louis, MO 63103-2010, USA
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12
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Pollheimer J, Zellner M, Eliasen MM, Roth E, Oehler R. Increased susceptibility of glutamine-depleted monocytes to fever-range hyperthermia: the role of 70-kDa heat shock protein. Ann Surg 2005; 241:349-55. [PMID: 15650647 PMCID: PMC1356922 DOI: 10.1097/01.sla.0000152028.19115.27] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE This study investigates the effect of fever-range hyperthermia on Gln-starving monocytes and the role of the 70-kDa heat shock protein Hsp70. SUMMARY BACKGROUND DATA Fever is a protective acute-phase response to infection. However, in critically ill patients, the harmful effects of fever seem to be predominant. Critical illness is frequently associated with reduced plasma glutamine (Gln) levels, which contribute to the immune suppression in these patients due to impaired monocyte function. METHODS Isolated monocytes were suspended in Gln-depleted medium and exposed to 41 degrees C. Cell survival was determined by an MTT-based assay, and phagocytosis of Escherichia coli was measured by flow cytometry. Expression of Hsp70 was determined by Western blot. RESULTS Hyperthermia for 300 minutes strongly decreased the viability of Gln-depleted monocytes (85%), whereas it had only a moderate effect on Gln-supplied cells (45%, P < 0.05). Shorter treatments (45 minutes) of Gln-starving monocytes had almost no effects on viability but decreased the phagocytosis activity by 30.8%. In addition, the expression of Hsp70 was inhibited almost completely. CONCLUSION These data show that Gln-starving monocytes have a reduced thermoresistance. This suggests that elevated body temperature damages monocytes in critically ill patients with reduced plasma Gln-levels possibly via an inhibition of the cytoprotective protein Hsp70.
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Affiliation(s)
- Jürgen Pollheimer
- Surgical Research Laboratories, Medical University of Vienna, Vienna, Austria
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Paquette JC, Guérin PJ, Gauthier ER. Rapid induction of the intrinsic apoptotic pathway byL-glutamine starvation. J Cell Physiol 2004; 202:912-21. [PMID: 15389638 DOI: 10.1002/jcp.20194] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
While the amino acid L-glutamine is known to play a role in the survival of several cell types, the underlying molecular mechanisms are still poorly defined. We show in this report that L-glutamine starvation rapidly triggered apoptosis in Sp2/0-Ag14 hybridoma cells. This process involved the activation of both caspases-9 and -3, suggesting that L-glutamine deprivation initiated an intrinsic apoptotic pathway in Sp2/0-Ag14 cells. Supporting this idea, the cytosolic release of the mitochondrial proteins SMAC/DIABLO and cytochrome c (Cyt c) was observed, with an initial limited leakage occurring during the first 30 min of L-glutamine deprivation, followed by a greater release after 60 min. The latter occurred simultaneously with the translocation of the pro-apoptotic protein Bax to the mitochondria. Finally, a decline in XIAP levels and the activation of caspases-3 and -9 were observed. Thus, L-glutamine deprivation of Sp2/0-Ag14 cells rapidly triggers intracellular events, which target the mitochondria, leading to the cytosolic release of apoptogenic factors, the activation of caspases-9 and -3, and the commitment to the death program. This work introduces the Sp2/0Ag14 hybridoma as a unique model for the study of the molecular events underlying the pro-survival function of L-glutamine.
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Affiliation(s)
- Julie C Paquette
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, Canada
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Melis GC, ter Wengel N, Boelens PG, van Leeuwen PAM. Glutamine: recent developments in research on the clinical significance of glutamine. Curr Opin Clin Nutr Metab Care 2004; 7:59-70. [PMID: 15090905 DOI: 10.1097/00075197-200401000-00011] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE OF REVIEW The aim of this review is to describe the clinical relevance of supplementation of glutamine from the recent literature. First, new basic research is examined and subsequently recent clinical trials and a metaanalysis are illustrated. RECENT FINDINGS Glutamine has a major impact on the functionality of the immune system. It has recently been established that glutamine not only has a protective effect on cells of the immune system, but also on other cells of the body, for instance cardiomyocytes. Evidence is accumulating for an effect of glutamine via glutathione, heat shock proteins as well as taurine. Another area of interest is the way glutamine enhances gut barrier function. More and more research is concentrating on the positive effect of glutamine on the gut-associated lymphoid tissue. SUMMARY Based on a recent meta-analysis and up-to-date clinical trials, we may conclude that glutamine has a beneficial effect on infectious complications and reduces hospital stay. In critically ill patients glutamine supplementation may reduce morbidity and mortality. The greatest effect was observed in patients receiving high dose parenteral glutamine. A recent study with high dose enteral glutamine demonstrated a reduced mortality in the glutamine supplemented group. In the future more trials with larger numbers of participants are needed, especially with high dose enteral glutamine in the perioperatively and the intensive care unit setting.
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Affiliation(s)
- Gerdien C Melis
- Department of Surgery, VU University Medical Center, Amsterdam, The Netherlands
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