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Yin J, Fang Y, Liao Y, Chen Z, Liu S, Zhu H, Song K, Shi B. Bioinformatics investigation of adaptive immune-related genes in peri-implantitis and periodontitis: Characteristics and diagnostic values. Immun Inflamm Dis 2024; 12:e1272. [PMID: 38780047 PMCID: PMC11112631 DOI: 10.1002/iid3.1272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/16/2024] [Accepted: 04/29/2024] [Indexed: 05/25/2024] Open
Abstract
BACKGROUND Peri-implantitis and periodontitis have similar immunological bioprocesses and inflammatory phenotypes. In the inflammatory process, the adaptive immune cells can drive the development of disease. This research investigated the differences and diagnostic significance of peri-implantitis and periodontitis in adaptive immune responses. METHODS We acquired four GEO datasets of gene expressions in surrounding tissues in healthy person, healthy implant, periodontitis, and peri-implantitis patients. The structural characteristics and enrichment analyses of differential expression genes were examined. The adaptive immune landscapes in peri-implantitis and periodontitis were then evaluated using single sample gene set enrichment analysis. The STRING database and Cytoscape were used to identify adaptive hub genes, and the ROC curve was used to verify them. Finally, qRT-PCR method was used to verify the expression level of Hub gene in activated T cells on the titanium-containing or titanium-free culture plates. RESULTS At the transcriptome level, the data of healthy implant, peri-implantitis and periodontitis were highly dissimilar. The peri-implantitis and periodontitis both exhibited adaptive immune response. Except for the activated CD4+T cells, there was no significant difference in other adaptive immune cells between peri-implantitis and periodontitis. In addition, correlation analysis showed that CD53, CYBB, and PLEK were significantly positively linked with activated CD4+T cells in the immune microenvironment of peri-implantitis, making them effective biomarkers to differentiate it from periodontitis. CONCLUSIONS Peri-implantitis has a uniquely immunogenomic landscape that differs from periodontitis. This study provides new insights and ideas into the activated CD4+T cells and hub genes that underpin the immunological bioprocess of peri-implantitis.
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Affiliation(s)
- Jingju Yin
- Department of Oral and Maxillofacial SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFuzhouChina
- Oral Medicine Center, National Regional Medical Center, Binhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouChina
- School of StomatologyFujian Medical UniversityFuzhouChina
- Fujian Key Laboratory of Oral Diseases, School and Hospital of StomatologyFujian Medical UniversityFuzhouChina
| | - Youran Fang
- School of StomatologyFujian Medical UniversityFuzhouChina
- Fujian Key Laboratory of Oral Diseases, School and Hospital of StomatologyFujian Medical UniversityFuzhouChina
| | - Yunyang Liao
- Department of Oral and Maxillofacial SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFuzhouChina
- Oral Medicine Center, National Regional Medical Center, Binhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouChina
- School of StomatologyFujian Medical UniversityFuzhouChina
- Fujian Key Laboratory of Oral Diseases, School and Hospital of StomatologyFujian Medical UniversityFuzhouChina
| | - Zhe Chen
- Department of Oral and Maxillofacial SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFuzhouChina
- Oral Medicine Center, National Regional Medical Center, Binhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouChina
- School of StomatologyFujian Medical UniversityFuzhouChina
- Fujian Key Laboratory of Oral Diseases, School and Hospital of StomatologyFujian Medical UniversityFuzhouChina
| | - Shaofeng Liu
- Department of Oral and Maxillofacial SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFuzhouChina
- Oral Medicine Center, National Regional Medical Center, Binhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouChina
- School of StomatologyFujian Medical UniversityFuzhouChina
- Fujian Key Laboratory of Oral Diseases, School and Hospital of StomatologyFujian Medical UniversityFuzhouChina
| | - Hanghang Zhu
- School of StomatologyFujian Medical UniversityFuzhouChina
- Fujian Key Laboratory of Oral Diseases, School and Hospital of StomatologyFujian Medical UniversityFuzhouChina
| | - Kun Song
- Department of Oral and Maxillofacial SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFuzhouChina
- Oral Medicine Center, National Regional Medical Center, Binhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouChina
| | - Bin Shi
- Department of Oral and Maxillofacial SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFuzhouChina
- Oral Medicine Center, National Regional Medical Center, Binhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouChina
- School of StomatologyFujian Medical UniversityFuzhouChina
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Kuntic I, Kuntic M, Oelze M, Stamm P, Karpi A, Kleinert H, Hahad O, Münzel T, Daiber A. The role of acrolein for E-cigarette vapour condensate mediated activation of NADPH oxidase in cultured endothelial cells and macrophages. Pflugers Arch 2023:10.1007/s00424-023-02825-9. [PMID: 37285062 DOI: 10.1007/s00424-023-02825-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/08/2023]
Abstract
Electronic cigarettes (E-cigarettes) have recently become a popular alternative to traditional tobacco cigarettes. Despite being marketed as a healthier alternative, increasing evidence shows that E-cigarette vapour could cause adverse health effects. It has been postulated that degradation products of E-cigarette liquid, mainly reactive aldehydes, are responsible for those effects. Previously, we have demonstrated that E-cigarette vapour exposure causes oxidative stress, inflammation, apoptosis, endothelial dysfunction and hypertension by activating NADPH oxidase in a mouse model. To better understand oxidative stress mechanisms, we have exposed cultured endothelial cells and macrophages to condensed E-cigarette vapour (E-cigarette condensate) and acrolein. In both endothelial cells (EA.hy 926) and macrophages (RAW 264.7), we have observed that E-cigarette condensate incubation causes cell death. Since recent studies have shown that among toxic aldehydes found in E-cigarette vapour, acrolein plays a prominent role, we have incubated the same cell lines with increasing concentrations of acrolein. Upon incubation with acrolein, a translocation of Rac1 to the plasma membrane has been observed, accompanied by an increase in oxidative stress. Whereas reactive oxygen species (ROS) formation by acrolein in cultured endothelial cells was mainly intracellular, the release of ROS in cultured macrophages was both intra- and extracellular. Our data also demonstrate that acrolein activates the nuclear factor erythroid 2-related factor 2 (Nrf2) antioxidant pathway and, in general, could mediate E-cigarette vapour-induced oxidative stress and cell death. More mechanistic insight is needed to clarify the toxicity associated with E-cigarette consumption and the possible adverse effects on human health.
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Affiliation(s)
- Ivana Kuntic
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Marin Kuntic
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Rhine-Main, Mainz, Germany
| | - Matthias Oelze
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Paul Stamm
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Rhine-Main, Mainz, Germany
| | - Angelica Karpi
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
| | - Hartmut Kleinert
- Department of Pharmacology, University Medical Center, Mainz, Germany
| | - Omar Hahad
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Rhine-Main, Mainz, Germany
| | - Thomas Münzel
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Rhine-Main, Mainz, Germany
| | - Andreas Daiber
- Department for Cardiology 1, University Medical Center Mainz, Molecular Cardiology, Geb. 605, Langenbeckstr. 1, 55131, Mainz, Germany.
- DZHK (German Center for Cardiovascular Research), Partner Site Rhine-Main, Mainz, Germany.
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3
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Saini N, Naaz A, Metur SP, Gahlot P, Walvekar A, Dutta A, Davathamizhan U, Sarin A, Laxman S. Methionine uptake via the SLC43A2 transporter is essential for regulatory T-cell survival. Life Sci Alliance 2022; 5:5/12/e202201663. [PMID: 36260753 PMCID: PMC9463494 DOI: 10.26508/lsa.202201663] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 08/30/2022] [Accepted: 08/30/2022] [Indexed: 11/24/2022] Open
Abstract
Regulatory T cells survive after IL-2 withdrawal by taking up and using methionine through the SLC43A2 transporter in a Notch1-dependent manner. Cell death, survival, or growth decisions in T-cell subsets depend on interplay between cytokine-dependent and metabolic processes. The metabolic requirements of T-regulatory cells (Tregs) for their survival and how these are satisfied remain unclear. Herein, we identified a necessary requirement of methionine uptake and usage for Tregs survival upon IL-2 deprivation. Activated Tregs have high methionine uptake and usage to S-adenosyl methionine, and this uptake is essential for Tregs survival in conditions of IL-2 deprivation. We identify a solute carrier protein SLC43A2 transporter, regulated in a Notch1-dependent manner that is necessary for this methionine uptake and Tregs viability. Collectively, we uncover a specifically regulated mechanism of methionine import in Tregs that is required for cells to adapt to cytokine withdrawal. We highlight the need for methionine availability and metabolism in contextually regulating cell death in this immunosuppressive population of T cells.
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Affiliation(s)
- Neetu Saini
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | - Afsana Naaz
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | - Shree Padma Metur
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | - Pinki Gahlot
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | - Adhish Walvekar
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | - Anupam Dutta
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | | | - Apurva Sarin
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
| | - Sunil Laxman
- Institute for Stem Cell Science and Regenerative Medicine (DBT-inStem), Bengaluru, India
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4
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Andrés CMC, Pérez de la Lastra JM, Juan CA, Plou FJ, Pérez-Lebeña E. The Role of Reactive Species on Innate Immunity. Vaccines (Basel) 2022; 10:vaccines10101735. [PMID: 36298601 PMCID: PMC9609844 DOI: 10.3390/vaccines10101735] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/06/2022] [Accepted: 10/14/2022] [Indexed: 11/16/2022] Open
Abstract
This review examines the role of reactive species RS (of oxygen ROS, nitrogen RNS and halogen RHS) on innate immunity. The importance of these species in innate immunity was first recognized in phagocytes that underwent a “respiratory burst” after activation. The anion superoxide •O2− and hydrogen peroxide H2O2 are detrimental to the microbial population. NADPH oxidase NOx, as an •O2− producer is essential for microbial destruction, and patients lacking this functional oxidase are more susceptible to microbial infections. Reactive nitrogen species RNS (the most important are nitric oxide radical -•NO, peroxynitrite ONOO— and its derivatives), are also harmful to microorganisms, including bacteria, viruses, and parasites. Hypochlorous acid HOCl and hypothiocyanous acid HOSCN synthesized through the enzyme myeloperoxidase MPO, which catalyzes the reaction between H2O2 and Cl− or SCN−, are important inorganic bactericidal molecules, effective against a wide range of microbes. This review also discusses the role of antimicrobial peptides AMPs and their induction of ROS. In summary, reactive species RS are the heart of the innate immune system, and they are necessary for microbial lysis in infections that can affect mammals throughout their lives.
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Affiliation(s)
| | - José Manuel Pérez de la Lastra
- Institute of Natural Products and Agrobiology, CSIC-Spanish Research Council, Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna, Spain
- Correspondence:
| | - Celia Andrés Juan
- Cinquima Institute and Department of Organic Chemistry, Faculty of Sciences, Valladolid University, Paseo de Belén 7, 47011 Valladolid, Spain
| | - Francisco J. Plou
- Institute of Catalysis and Petrochemistry, CSIC-Spanish Research Council, 28049 Madrid, Spain
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5
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Saini N, Lakshminarayanan S, Kundu P, Sarin A. Notch1 Modulation of Cellular Calcium Regulates Mitochondrial Metabolism and Anti-Apoptotic Activity in T-Regulatory Cells. Front Immunol 2022; 13:832159. [PMID: 35222416 PMCID: PMC8866856 DOI: 10.3389/fimmu.2022.832159] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 01/21/2022] [Indexed: 01/04/2023] Open
Abstract
As the major hub of metabolic activity and an organelle sequestering pro-apoptogenic intermediates, mitochondria lie at the crossroads of cellular decisions of death and survival. Intracellular calcium is a key regulator of these outcomes with rapid, uncontrolled uptake into mitochondria, activating pro-apoptotic cascades that trigger cell death. Here, we show that calcium uptake and mitochondrial metabolism in murine T-regulatory cells (Tregs) is tuned by Notch1 activity. Based on analysis of Tregs and the HEK cell line, we present evidence that modulation of cellular calcium dynamics underpins Notch1 regulation of mitochondrial homeostasis and consequently anti-apoptotic activity. Targeted siRNA-mediated ablations reveal dependency on molecules controlling calcium release from the endoplasmic reticulum (ER) and the chaperone, glucose-regulated protein 75 (Grp75), the associated protein Voltage Dependent Anion Channel (VDAC)1 and the Mitochondrial Calcium Uniporter (MCU), which together facilitate ER calcium transfer and uptake into the mitochondria. Endogenous Notch1 is detected in immune-complexes with Grp75 and VDAC1. Deficits in mitochondrial oxidative and survival in Notch1 deficient Tregs, were corrected by the expression of recombinant Notch1 intracellular domain, and in part by recombinant Grp75. Thus, the modulation of calcium dynamics and consequently mitochondrial metabolism underlies Treg survival in conditions of nutrient stress. This work positions a key role for Notch1 activity in these outcomes.
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Affiliation(s)
- Neetu Saini
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bengaluru, India.,Department of Biology, Manipal Academy of Higher Education, Manipal, India
| | - Sowmya Lakshminarayanan
- National Centre for Biological Science, TATA Institute of Fundamental Research (TIFR), Bengaluru, India
| | - Priyanka Kundu
- National Centre for Biological Science, TATA Institute of Fundamental Research (TIFR), Bengaluru, India
| | - Apurva Sarin
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bengaluru, India
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6
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Ratheesh M, Sunil S, Sheethal S, Jose SP, Sandya S, Ghosh OSN, Rajan S, Jagmag T, Tilwani J. Anti-inflammatory and anti-COVID-19 effect of a novel polyherbal formulation (Imusil) via modulating oxidative stress, inflammatory mediators and cytokine storm. Inflammopharmacology 2022; 30:173-184. [PMID: 35075553 PMCID: PMC8786592 DOI: 10.1007/s10787-021-00911-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 12/06/2021] [Indexed: 12/27/2022]
Abstract
In the current scenario, most countries are affected by COVID-19, a pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that has a massive impact on human health. Previous studies showed that some traditionally used medicinal herbs and their combinations showed synergistic anti-viral and anti-inflammatory activity against SARS-CoV-2 type infections. Therefore, the goal of this study is to demonstrate the anti-viral and anti-inflammatory effects of a novel polyherbal formulation, hereinafter referred to as Imusil, on Vero E6 cell lines and Raw 264.7 murine macrophage cells respectively. The Imusil was subjected to identify its chemical characterisations such as UV–Visible spectrum profile, Fourier transform infrared spectroscopy (FT-IR) and gas chromatography–mass spectroscopic (GC–MS) analysis. FT-IR analysis of Imusil peak values with various functional compounds such as alcohol, esters, aliphatic and carboxylic acids. GC–MS analysis of compounds with totally 87 compounds major chemical compounds were identified, such as 3-(Octanoyloxy) propane-1,2-diyl bis(decanoate), Succinic acid, 2-methylhex-3-yl 2,2,2-trifluoroethyl ester, Neophytadiene, 3,5,9-Trioxa-4-phosphaheneicosan-1-aminium, 4-hydroxy-N,N,N-trimethyl-10-oxo-7-[(1-oxododecyl)oxy]-, hydroxide, inner salt, 4-oxide, (R)-. The anti-viral activity of Imusil against SARS-CoV-2 was assessed using plaque reduction assay and anti-inflammatory study was conducted on lipopolysaccharide (LPS)-induced RAW 264.7 cells. The results obtained from the study reveal that Imusil significantly inhibited SARS-CoV-2 replication in Vero E6 cells and the production of inflammatory mediator’s cyclooxygenase-2 and pro-inflammatory cytokines like tumour necrosis factor-α and interleukin- 6 were significantly reduced, along with thwarting the significant oxidative stress by preventing the expression of NOX-2 thereby inhibiting the reactive oxygen species formation. Hence, considering the current study as a novel strategy for mediating the COVID-19 associated aliments, inceptive scientific evidence of Imusil promises its potential therapeutic implications against COVID-19 and inflammatory conditions.
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Affiliation(s)
- M Ratheesh
- Department of Biochemistry, St. Thomas College, Palai, Kottayam, 686574, Kerala, India.
| | - Sujatha Sunil
- Vector Borne Disease Group, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - S Sheethal
- Department of Biochemistry, St. Thomas College, Palai, Kottayam, 686574, Kerala, India
| | - Svenia P Jose
- Department of Biochemistry, St. Thomas College, Palai, Kottayam, 686574, Kerala, India
| | - S Sandya
- Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Karnataka, India
| | | | - Sony Rajan
- Department of Biochemistry, St. Thomas College, Palai, Kottayam, 686574, Kerala, India
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7
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Mortimer PM, Mc Intyre SA, Thomas DC. Beyond the Extra Respiration of Phagocytosis: NADPH Oxidase 2 in Adaptive Immunity and Inflammation. Front Immunol 2021; 12:733918. [PMID: 34539670 PMCID: PMC8440999 DOI: 10.3389/fimmu.2021.733918] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/16/2021] [Indexed: 12/15/2022] Open
Abstract
Reactive oxygen species (ROS) derived from the phagocyte NADPH oxidase (NOX2) are essential for host defence and immunoregulation. Their levels must be tightly controlled. ROS are required to prevent infection and are used in signalling to regulate several processes that are essential for normal immunity. A lack of ROS then leads to immunodeficiency and autoinflammation. However, excess ROS are also deleterious, damaging tissues by causing oxidative stress. In this review, we focus on two particular aspects of ROS biology: (i) the emerging understanding that NOX2-derived ROS play a pivotal role in the development and maintenance of adaptive immunity and (ii) the effects of excess ROS in systemic disease and how limiting ROS might represent a therapeutic avenue in limiting excess inflammation.
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Affiliation(s)
- Paige M Mortimer
- Centre for Inflammatory Disease, Department of Immunology & Inflammation, Imperial College, London, United Kingdom
| | - Stacey A Mc Intyre
- Centre for Inflammatory Disease, Department of Immunology & Inflammation, Imperial College, London, United Kingdom
| | - David C Thomas
- Centre for Inflammatory Disease, Department of Immunology & Inflammation, Imperial College, London, United Kingdom
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8
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Role of Oxidative DNA Damage and Repair in Atrial Fibrillation and Ischemic Heart Disease. Int J Mol Sci 2021; 22:ijms22083838. [PMID: 33917194 PMCID: PMC8068079 DOI: 10.3390/ijms22083838] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 03/31/2021] [Accepted: 04/02/2021] [Indexed: 02/07/2023] Open
Abstract
Atrial fibrillation (AF) and ischemic heart disease (IHD) represent the two most common clinical cardiac diseases, characterized by angina, arrhythmia, myocardial damage, and cardiac dysfunction, significantly contributing to cardiovascular morbidity and mortality and posing a heavy socio-economic burden on society worldwide. Current treatments of these two diseases are mainly symptomatic and lack efficacy. There is thus an urgent need to develop novel therapies based on the underlying pathophysiological mechanisms. Emerging evidence indicates that oxidative DNA damage might be a major underlying mechanism that promotes a variety of cardiac diseases, including AF and IHD. Antioxidants, nicotinamide adenine dinucleotide (NAD+) boosters, and enzymes involved in oxidative DNA repair processes have been shown to attenuate oxidative damage to DNA, making them potential therapeutic targets for AF and IHD. In this review, we first summarize the main molecular mechanisms responsible for oxidative DNA damage and repair both in nuclei and mitochondria, then describe the effects of oxidative DNA damage on the development of AF and IHD, and finally discuss potential targets for oxidative DNA repair-based therapeutic approaches for these two cardiac diseases.
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Peng HY, Lucavs J, Ballard D, Das JK, Kumar A, Wang L, Ren Y, Xiong X, Song J. Metabolic Reprogramming and Reactive Oxygen Species in T Cell Immunity. Front Immunol 2021; 12:652687. [PMID: 33868291 PMCID: PMC8044852 DOI: 10.3389/fimmu.2021.652687] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 03/08/2021] [Indexed: 12/17/2022] Open
Abstract
T cells undergo metabolic reprogramming and multiple biological processes to satisfy their energetic and biosynthetic demands throughout their lifespan. Several of these metabolic pathways result in the generation of reactive oxygen species (ROS). The imbalance between ROS generation and scavenging could result in severe damage to the cells and potential cell death, ultimately leading to T cell-related diseases. Interestingly, ROS play an essential role in T cell immunity. Here, we introduce the important connectivity between T cell lifespan and the metabolic reprogramming among distinct T cell subsets. We also discuss the generation and sources of ROS production within T cell immunity as well as highlight recent research concerning the effects of ROS on T cell activities.
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Affiliation(s)
- Hao-Yun Peng
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, United States
| | - Jason Lucavs
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Darby Ballard
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Jugal Kishore Das
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Anil Kumar
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Liqing Wang
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, United States
| | - Yijie Ren
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Xiaofang Xiong
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Jianxun Song
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, Bryan, TX, United States
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10
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Moldogazieva NT, Mokhosoev IM, Mel'nikova TI, Zavadskiy SP, Kuz'menko AN, Terentiev AA. Dual Character of Reactive Oxygen, Nitrogen, and Halogen Species: Endogenous Sources, Interconversions and Neutralization. BIOCHEMISTRY (MOSCOW) 2020; 85:S56-S78. [PMID: 32087054 DOI: 10.1134/s0006297920140047] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Oxidative stress resulting from accumulation of reactive oxygen, nitrogen, and halogen species (ROS, RNS, and RHS, respectively) causes the damage of cells and biomolecules. However, over the long evolutionary time, living organisms have developed the mechanisms for adaptation to oxidative stress conditions including the activity of the antioxidant system (AOS), which maintains low intracellular levels of RONS (ROS and RNS) and RHS. Moreover, living organisms have adapted to use low concentrations of these electrophiles for the regulation of cell functions through the reversible post-translational chemical modifications of redox-sensitive amino acid residues in intracellular effectors of signal transduction pathways (protein kinases and protein phosphatases), transcription factors, etc. An important fine-tuning mechanism that ensures involvement of RONS and RHS in the regulation of physiological processes is interconversion between different reactive species. This review focuses on the complex networks of interacting RONS and RHS types and their endogenous sources, such as NOX family of NADPH oxidases, complexes I and III of the mitochondrial electron transport chain, NO synthases, cytochrome P450-containing monooxygenase system, xanthine oxidoreductase, and myeloperoxidases. We highlight that kinetic parameters of reactions involving RONS and RHS determine the effects of these reactive species on cell functions. We also describe the functioning of enzymatic and non-enzymatic AOS components and the mechanisms of RONS and RHS scavenging under physiological conditions. We believe that analysis of interactions between RONS and relationships between different endogenous sources of these compounds will contribute to better understanding of their role in the maintenance of cell redox homeostasis as well as initiation and progression of diseases.
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Affiliation(s)
- N T Moldogazieva
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia.
| | - I M Mokhosoev
- Pirogov Russian National Research Medical University, Moscow, 117997, Russia.
| | - T I Mel'nikova
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia
| | - S P Zavadskiy
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia
| | - A N Kuz'menko
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia
| | - A A Terentiev
- Pirogov Russian National Research Medical University, Moscow, 117997, Russia
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11
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Yang S, Wang Y, Luo S, Shan C, Geng Y, Zhang T, Sheng S, Zan X. Building polyphenol and gelatin films as implant coating, evaluating from in vitro and in vivo performances. Colloids Surf B Biointerfaces 2019; 181:549-560. [PMID: 31185447 DOI: 10.1016/j.colsurfb.2019.05.058] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 05/09/2019] [Accepted: 05/23/2019] [Indexed: 12/18/2022]
Abstract
Bone related implants have huge potential market in global. Improving the implant outcomes and probability of implant success are highly pursued to relieve the pain of patients and burden on native healthy system. There are growing evidence to support reactive oxygen species (ROS) directly involved in bone diseases and failure of implants. Taking advantage of the antioxidant property of tannic acid (TA) and biocompatibility of gelatin (Gel), the TA/Gel multilayer film was fabricated by layer by layer method, and the growing process of this film was monitored by QCM-D. The physical properties of TA/Gel film were further well characterized and modulated. In cellular test, TA/Gel multilayer film displayed good antioxidant properties under ROS stress environment (after H2O2 treatment flourscence intensity increased 38.9-fold for glasses, only ˜6-fold for (TA/Gel)8), facilitating cell attachment, fastening spreading at early stage and accelerating proliferation in beginning 2 day. Area per cell on (TA/ Gel)4-0.15 M is 1.5-fold higher than that on glass at 2 h, while it became 2.3-fold higher at 4 h. Moreover, these films performed both enhanced osteogenesis in vitro test and bone formation in vivo in the animal bone implanting model. Our results supported discovered the antioxidant coating played the critical role one the success of bone related implants, which could be particularly noted in the future implant design. And the strategy applied here, utilizing the interactions between polyphenol and proteins to construct multilayer film, will pave the way to fabricating an antioxidant coating.
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Affiliation(s)
- Shuoshuo Yang
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, Zhejiang Province, 325035. PR China; Wenzhou Institute of Biomaterials and Engineering, CNITECH, Chinese Academy of Sciences, Wenzhou, Zhejiang Province, 325001, PR China; Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province, Wenzhou Institute of Biomaterials and Engineering, CAS Wenzhou, Zhejiang Province, 325001, PR China
| | - Yong Wang
- Institute of Materials Research and Engineering, A⁎STAR (Agency for Science, Technology and Research), #08-03, 2 Fusionopolis Way, Innovis, 138634, Singapore
| | - Shan Luo
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, Zhejiang Province, 325035. PR China
| | - Chenjie Shan
- Department of Orthopaedics,The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 325035, PR China
| | - Yibo Geng
- Department of Orthopaedics,The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 325035, PR China
| | - Tinghong Zhang
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, Zhejiang Province, 325035. PR China; Wenzhou Institute of Biomaterials and Engineering, CNITECH, Chinese Academy of Sciences, Wenzhou, Zhejiang Province, 325001, PR China; Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province, Wenzhou Institute of Biomaterials and Engineering, CAS Wenzhou, Zhejiang Province, 325001, PR China
| | - Sunren Sheng
- Department of Orthopaedics,The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 325035, PR China.
| | - Xingjie Zan
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, Zhejiang Province, 325035. PR China; Wenzhou Institute of Biomaterials and Engineering, CNITECH, Chinese Academy of Sciences, Wenzhou, Zhejiang Province, 325001, PR China; Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province, Wenzhou Institute of Biomaterials and Engineering, CAS Wenzhou, Zhejiang Province, 325001, PR China.
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12
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Perturbation in cellular redox homeostasis: Decisive regulator of T cell mediated immune responses. Int Immunopharmacol 2019; 67:449-457. [DOI: 10.1016/j.intimp.2018.12.049] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 12/19/2018] [Accepted: 12/21/2018] [Indexed: 12/30/2022]
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13
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Yu T, Wan P, Zhu XD, Ren YP, Wang C, Yan RW, Guo Y, Bai AP. Inhibition of NADPH oxidase activities ameliorates DSS-induced colitis. Biochem Pharmacol 2018; 158:126-133. [PMID: 30321511 DOI: 10.1016/j.bcp.2018.10.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 10/11/2018] [Indexed: 02/06/2023]
Abstract
NADPH oxidases (NOX) act to generate reactive oxygen species (ROS) and exhibit microbicidal bioactivity, whereas their roles in mediating immune responses of inflammation in intestine remain to be further elucidated. The study was performed to explore the effects of NOX activity on regulation of macrophage functions. Macrophage responses were induced by lipopolysaccharides (LPS) in RAW 264.7 cells (in vitro) or dextran sulfate sodium (DSS) in BALB/c mice (in vivo) respectively. LPS induced NOX2 expression and initiated NOX activities in RAW 264.7 cells. Conversely, inhibition of NOX activity by DPI and VAS2870 diminished LPS induced NOX activities and the downstream signaling in RAW 264.7 cells. Murine colitis was characterized by macrophage accumulation and elevation of NOX activities in colon tissues. DPI and VAS2870 administration overrode NOX activities and ROS productions in colon tissues, and ameliorated DSS-induced colitis evidenced with the reduced disease activities and the decreased cytokine levels. Intriguingly, NOX2 expression levels were elevated in colon tissues of patients with active inflammatory bowel disease. Together, our data show a crucial role of NOX activity in regulation of macrophage functions and responses, and suggest that NOX represents a novel therapeutic approach for the management of immune diseases.
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Affiliation(s)
- Tao Yu
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Ping Wan
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Xiao-Dan Zhu
- Transplant Center, Department of Surgery, The Affiliated Hospital of Qingdao University, Qingdao 266555, China
| | - Yu-Ping Ren
- Department of Rheumatology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Chong Wang
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Run-Wei Yan
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Yuan Guo
- Department of Pharmacy, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Ai-Ping Bai
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China.
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14
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Lian G, Gnanaprakasam JNR, Wang T, Wu R, Chen X, Liu L, Shen Y, Yang M, Yang J, Chen Y, Vasiliou V, Cassel TA, Green DR, Liu Y, Fan TWM, Wang R. Glutathione de novo synthesis but not recycling process coordinates with glutamine catabolism to control redox homeostasis and directs murine T cell differentiation. eLife 2018; 7:e36158. [PMID: 30198844 PMCID: PMC6152796 DOI: 10.7554/elife.36158] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 09/09/2018] [Indexed: 12/25/2022] Open
Abstract
Upon antigen stimulation, T lymphocytes undergo dramatic changes in metabolism to fulfill the bioenergetic, biosynthetic and redox demands of proliferation and differentiation. Glutathione (GSH) plays an essential role in controlling redox balance and cell fate. While GSH can be recycled from Glutathione disulfide (GSSG), the inhibition of this recycling pathway does not impact GSH content and murine T cell fate. By contrast, the inhibition of the de novo synthesis of GSH, by deleting either the catalytic (Gclc) or the modifier (Gclm) subunit of glutamate-cysteine ligase (Gcl), dampens intracellular GSH, increases ROS, and impact T cell differentiation. Moreover, the inhibition of GSH de novo synthesis dampened the pathological progression of experimental autoimmune encephalomyelitis (EAE). We further reveal that glutamine provides essential precursors for GSH biosynthesis. Our findings suggest that glutamine catabolism fuels de novo synthesis of GSH and directs the lineage choice in T cells.
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Affiliation(s)
- Gaojian Lian
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
- Medical Research CenterUniversity of South ChinaHengyang, Hunan ProvinceChina
| | - JN Rashida Gnanaprakasam
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
| | - Tingting Wang
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
| | - Ruohan Wu
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
| | - Xuyong Chen
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
| | - Lingling Liu
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
| | - Yuqing Shen
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
| | - Mao Yang
- Department of ImmunologySt. Jude Children’s Research HospitalMemphisUnited States
| | - Jun Yang
- Department of SurgerySt. Jude Children’s Research HospitalMemphisUnited States
| | - Ying Chen
- Department of Environmental Health Sciences, Yale School of Public HealthYale UniversityNew HavenUnited States
| | - Vasilis Vasiliou
- Department of Environmental Health Sciences, Yale School of Public HealthYale UniversityNew HavenUnited States
| | - Teresa A Cassel
- Department of Toxicology and Cancer BiologyUniversity of KentuckyLexingtonUnited States
- Markey Cancer CenterUniversity of KentuckyLexingtonUnited States
- Center for Environmental and Systems BiochemistryUniversity of KentuckyLexingtonUnited States
| | - Douglas R Green
- Department of ImmunologySt. Jude Children’s Research HospitalMemphisUnited States
| | - Yusen Liu
- Center for Perinatal ResearchThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusOhio, United States
| | - Teresa WM Fan
- Department of Toxicology and Cancer BiologyUniversity of KentuckyLexingtonUnited States
- Markey Cancer CenterUniversity of KentuckyLexingtonUnited States
- Center for Environmental and Systems BiochemistryUniversity of KentuckyLexingtonUnited States
| | - Ruoning Wang
- Center for Childhood Cancer and Blood Diseases, Hematology, Oncology and BMThe Research Institute at Nationwide Children's Hospital, Ohio State UniversityColumbusUnited States
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15
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Rashida Gnanaprakasam JN, Wu R, Wang R. Metabolic Reprogramming in Modulating T Cell Reactive Oxygen Species Generation and Antioxidant Capacity. Front Immunol 2018; 9:1075. [PMID: 29868027 PMCID: PMC5964129 DOI: 10.3389/fimmu.2018.01075] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 04/30/2018] [Indexed: 12/28/2022] Open
Abstract
A robust adaptive immune response requires a phase of proliferative burst which is followed by the polarization of T cells into relevant functional subsets. Both processes are associated with dramatically increased bioenergetics demands, biosynthetic demands, and redox demands. T cells meet these demands by rewiring their central metabolic pathways that generate energy and biosynthetic precursors by catabolizing and oxidizing nutrients into carbon dioxide. Simultaneously, oxidative metabolism also produces reactive oxygen species (ROS), which are tightly controlled by antioxidants and plays important role in regulating T cell functions. In this review, we discuss how metabolic rewiring during T cell activation influence ROS production and antioxidant capacity.
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Affiliation(s)
- Josephin N Rashida Gnanaprakasam
- Center for Childhood Cancer & Blood Diseases, Hematology/Oncology & BMT, The Research Institute at Nationwide Children's Hospital, Ohio State University, Columbus, OH, United States
| | - Ruohan Wu
- Center for Childhood Cancer & Blood Diseases, Hematology/Oncology & BMT, The Research Institute at Nationwide Children's Hospital, Ohio State University, Columbus, OH, United States
| | - Ruoning Wang
- Center for Childhood Cancer & Blood Diseases, Hematology/Oncology & BMT, The Research Institute at Nationwide Children's Hospital, Ohio State University, Columbus, OH, United States
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16
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Moldogazieva NT, Mokhosoev IM, Feldman NB, Lutsenko SV. ROS and RNS signalling: adaptive redox switches through oxidative/nitrosative protein modifications. Free Radic Res 2018; 52:507-543. [PMID: 29589770 DOI: 10.1080/10715762.2018.1457217] [Citation(s) in RCA: 177] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Over the last decade, a dual character of cell response to oxidative stress, eustress versus distress, has become increasingly recognized. A growing body of evidence indicates that under physiological conditions, low concentrations of reactive oxygen and nitrogen species (RONS) maintained by the activity of endogenous antioxidant system (AOS) allow reversible oxidative/nitrosative modifications of key redox-sensitive residues in regulatory proteins. The reversibility of redox modifications such as Cys S-sulphenylation/S-glutathionylation/S-nitrosylation/S-persulphidation and disulphide bond formation, or Tyr nitration, which occur through electrophilic attack of RONS to nucleophilic groups in amino acid residues provides redox switches in the activities of signalling proteins. Key requirement for the involvement of the redox modifications in RONS signalling including ROS-MAPK, ROS-PI3K/Akt, and RNS-TNF-α/NF-kB signalling is their specificity provided by a residue microenvironment and reaction kinetics. Glutathione, glutathione peroxidases, peroxiredoxins, thioredoxin, glutathione reductases, and glutaredoxins modulate RONS level and cell signalling, while some of the modulators (glutathione, glutathione peroxidases and peroxiredoxins) are themselves targets for redox modifications. Additionally, gene expression, activities of transcription factors, and epigenetic pathways are also under redox regulation. The present review focuses on RONS sources (NADPH-oxidases, mitochondrial electron-transportation chain (ETC), nitric oxide synthase (NOS), etc.), and their cross-talks, which influence reversible redox modifications of proteins as physiological phenomenon attained by living cells during the evolution to control cell signalling in the oxygen-enriched environment. We discussed recent advances in investigation of mechanisms of protein redox modifications and adaptive redox switches such as MAPK/PI3K/PTEN, Nrf2/Keap1, and NF-κB/IκB, powerful regulators of numerous physiological processes, also implicated in various diseases.
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Affiliation(s)
- N T Moldogazieva
- a Department of Biotechnology, I.M. Sechenov First Moscow State Medical University (Sechenov University) , Moscow , Russia
| | - I M Mokhosoev
- a Department of Biotechnology, I.M. Sechenov First Moscow State Medical University (Sechenov University) , Moscow , Russia
| | - N B Feldman
- a Department of Biotechnology, I.M. Sechenov First Moscow State Medical University (Sechenov University) , Moscow , Russia
| | - S V Lutsenko
- a Department of Biotechnology, I.M. Sechenov First Moscow State Medical University (Sechenov University) , Moscow , Russia
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17
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Carneiro MBH, Roma EH, Ranson AJ, Doria NA, Debrabant A, Sacks DL, Vieira LQ, Peters NC. NOX2-Derived Reactive Oxygen Species Control Inflammation during Leishmania amazonensis Infection by Mediating Infection-Induced Neutrophil Apoptosis. THE JOURNAL OF IMMUNOLOGY 2017; 200:196-208. [PMID: 29158417 DOI: 10.4049/jimmunol.1700899] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 10/23/2017] [Indexed: 12/25/2022]
Abstract
Reactive oxygen species (ROS) produced by NADPH phagocyte oxidase isoform (NOX2) are critical for the elimination of intracellular pathogens in many infections. Despite their importance, the role of ROS following infection with the eukaryotic pathogen Leishmania has not been fully elucidated. We addressed the role of ROS in C57BL/6 mice following intradermal infection with Leishmania amazonensis. Despite equivalent parasite loads compared with wild-type (WT) mice, mice deficient in ROS production by NOX2 due to the absence of the gp91 subunit (gp91phox-/-) had significantly more severe pathology in the later stages of infection. Pathology in gp91phox-/- mice was not associated with alterations in CD4+ T cell-mediated immunity but was preceded by enhanced neutrophil accumulation at the dermal infection site. Ex vivo analysis of infected versus uninfected neutrophils revealed a deficiency in infection-driven apoptosis in gp91phox-/- mice versus WT mice. gp91phox-/- mice presented with higher percentages of healthy or necrotic neutrophils but lower percentages of apoptotic neutrophils at early and chronic time points. In vitro infection of gp91phox-/- versus WT neutrophils also revealed reduced apoptosis and CD95 expression but increased necrosis in infected cells at 10 h postinfection. Provision of exogenous ROS in the form of H2O2 reversed the necrotic phenotype and restored CD95 expression on infected gp91phox-/- neutrophils. Although ROS production is typically viewed as a proinflammatory event, our observations identify the importance of ROS in mediating appropriate neutrophil apoptosis and the importance of apoptosis in inflammation and pathology during chronic infection.
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Affiliation(s)
- Matheus B H Carneiro
- Snyder Institute for Chronic Diseases, Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta T2N 4Z6, Canada.,Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Eric H Roma
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil.,Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20852; and
| | - Adam J Ranson
- Snyder Institute for Chronic Diseases, Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta T2N 4Z6, Canada
| | - Nicole A Doria
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20852; and
| | - Alain Debrabant
- Division of Emerging and Transfusion Transmitted Diseases, Office of Blood Research and Review, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Bethesda, MD 20993
| | - David L Sacks
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20852; and
| | - Leda Q Vieira
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Nathan C Peters
- Snyder Institute for Chronic Diseases, Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta T2N 4Z6, Canada;
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18
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Marcel N, Sarin A. Notch1 regulated autophagy controls survival and suppressor activity of activated murine T-regulatory cells. eLife 2016; 5. [PMID: 27267497 PMCID: PMC4894756 DOI: 10.7554/elife.14023] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 05/09/2016] [Indexed: 12/22/2022] Open
Abstract
Cell survival is one of several processes regulated by the Notch pathway in mammalian cells. Here we report functional outcomes of non-nuclear Notch signaling to activate autophagy, a conserved cellular response to nutrient stress, regulating survival in murine natural T-regulatory cells (Tregs), an immune subset controlling tolerance and inflammation. Induction of autophagy required ligand-dependent, Notch intracellular domain (NIC) activity, which controlled mitochondrial organization and survival of activated Tregs. Consistently, NIC immune-precipitated Beclin and Atg14, constituents of the autophagy initiation complex. Further, ectopic expression of an effector of autophagy (Atg3) or recombinant NIC tagged to a nuclear export signal (NIC-NES), restored autophagy and suppressor function in Notch1(-/-) Tregs. Furthermore, Notch1 deficiency in the Treg lineage resulted in immune hyperactivity, implicating Notch activity in Treg homeostasis. Notch1 integration with autophagy, revealed in these experiments, holds implications for Notch regulated cell-fate decisions governing differentiation.
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Affiliation(s)
- Nimi Marcel
- National Centre for Biological Sciences, Bengaluru, India.,Department of Biology, Manipal University, Manipal, India
| | - Apurva Sarin
- National Centre for Biological Sciences, Bengaluru, India.,Institute for Stem Cell Biology & Regenerative Medicine, Bengaluru, India
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19
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NADH oxidase-dependent CD39 expression by CD8(+) T cells modulates interferon gamma responses via generation of adenosine. Nat Commun 2015; 6:8819. [PMID: 26549640 PMCID: PMC4667632 DOI: 10.1038/ncomms9819] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 10/07/2015] [Indexed: 12/22/2022] Open
Abstract
Interferon gamma (IFNγ)-producing CD8+ T cells (Tc1) play important roles in immunological disease. We now report that CD3/CD28-mediated stimulation of CD8+ T cells to generate Tc1 cells, not only increases IFNγ production but also boosts the generation of reactive oxygen species (ROS) and augments expression of CD39. Inhibition of NADPH oxidases or knockdown of gp91phox in CD8+ T cells abrogates ROS generation, which in turn modulates JNK and NFκB signalling with decreases in both IFNγ levels and CD39 expression. CD39+CD8+ T cells substantially inhibit IFNγ production by CD39−CD8+ T cells via the paracrine generation of adenosine, which is operational via adenosine type 2A receptors. Increases in numbers of CD39+CD8+ T cells and associated enhancements in ROS signal transduction are noted in cells from patients with Crohn's disease. Our findings provide insights into Tc1-mediated IFNγ responses and ROS generation and link these pathways to CD39/adenosine-mediated effects in immunological disease. The ectonucleotidase CD39 ultimately generates extracellular adenosine, modulating paracrine purinergic signaling. Here the authors show that IFNγ induction in CD8+ T cells is accompanied by NADH oxidase-dependent CD39 expression, which then inhibits IFNγ production in CD39-CD8+ T cells.
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20
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Tkachev V, Goodell S, Opipari AW, Hao LY, Franchi L, Glick GD, Ferrara JLM, Byersdorfer CA. Programmed death-1 controls T cell survival by regulating oxidative metabolism. THE JOURNAL OF IMMUNOLOGY 2015; 194:5789-800. [PMID: 25972478 DOI: 10.4049/jimmunol.1402180] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 04/14/2015] [Indexed: 12/13/2022]
Abstract
The coinhibitory receptor programmed death-1 (PD-1) maintains immune homeostasis by negatively regulating T cell function and survival. Blockade of PD-1 increases the severity of graft-versus-host disease (GVHD), but the interplay between PD-1 inhibition and T cell metabolism is not well studied. We found that both murine and human alloreactive T cells concomitantly upregulated PD-1 expression and increased levels of reactive oxygen species (ROS) following allogeneic bone marrow transplantation. This PD-1(Hi)ROS(Hi) phenotype was specific to alloreactive T cells and was not observed in syngeneic T cells during homeostatic proliferation. Blockade of PD-1 signaling decreased both mitochondrial H2O2 and total cellular ROS levels, and PD-1-driven increases in ROS were dependent upon the oxidation of fatty acids, because treatment with etomoxir nullified changes in ROS levels following PD-1 blockade. Downstream of PD-1, elevated ROS levels impaired T cell survival in a process reversed by antioxidants. Furthermore, PD-1-driven changes in ROS were fundamental to establishing a cell's susceptibility to subsequent metabolic inhibition, because blockade of PD-1 decreased the efficacy of later F1F0-ATP synthase modulation. These data indicate that PD-1 facilitates apoptosis in alloreactive T cells by increasing ROS in a process dependent upon the oxidation of fat. In addition, blockade of PD-1 undermines the potential for subsequent metabolic inhibition, an important consideration given the increasing use of anti-PD-1 therapies in the clinic.
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Affiliation(s)
- Victor Tkachev
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109
| | - Stefanie Goodell
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109
| | - Anthony W Opipari
- Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI 48109
| | | | | | - Gary D Glick
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109; and
| | - James L M Ferrara
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109
| | - Craig A Byersdorfer
- Division of Blood and Marrow Transplant and Cellular Therapies, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15224
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21
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Abstract
The mechanism by which reactive oxygen species (ROS) are produced by tumour cells remained incompletely understood until the discovery over the last 15 years of the family of NADPH oxidases (NOXs 1–5 and dual oxidases DUOX1/2) which are structural homologues of gp91phox, the major membrane-bound component of the respiratory burst oxidase of leucocytes. Knowledge of the roles of the NOX isoforms in cancer is rapidly expanding. Recent evidence suggests that both NOX1 and DUOX2 species produce ROS in the gastrointestinal tract as a result of chronic inflammatory stress; cytokine induction (by interferon-γ, tumour necrosis factor α, and interleukins IL-4 and IL-13) of NOX1 and DUOX2 may contribute to the development of colorectal and pancreatic carcinomas in patients with inflammatory bowel disease and chronic pancreatitis, respectively. NOX4 expression is increased in pre-malignant fibrotic states which may lead to carcinomas of the lung and liver. NOX5 is highly expressed in malignant melanomas, prostate cancer and Barrett's oesophagus-associated adenocarcinomas, and in the last it is related to chronic gastro-oesophageal reflux and inflammation. Over-expression of functional NOX proteins in many tissues helps to explain tissue injury and DNA damage from ROS that accompany pre-malignant conditions, as well as elucidating the potential mechanisms of NOX-related damage that contribute to both the initiation and the progression of a wide range of solid and haematopoietic malignancies.
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22
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Schreiber A, Luft FC, Kettritz R. Phagocyte NADPH oxidase restrains the inflammasome in ANCA-induced GN. J Am Soc Nephrol 2014; 26:411-24. [PMID: 25012177 DOI: 10.1681/asn.2013111177] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
ANCA-activated phagocytes cause vasculitis and necrotizing crescentic GN (NCGN). ANCA-induced phagocyte NADPH oxidase (Phox) may contribute by generating tissue-damaging reactive oxygen species. We tested an alternative hypothesis, in which Phox restrains inflammation by downregulating caspase-1, thereby reducing IL-1β generation and limiting NCGN. In an antimyeloperoxidase (anti-MPO) antibody-mediated disease model, mice transplanted with either gp91(phox)-deficient or p47(phox)-deficient bone marrow showed accelerated disease with increased crescents, necrosis, glomerular monocytes, and renal IL-1β levels compared with mice transplanted with wild-type bone marrow. IL-1β receptor blockade abrogated aggravated NCGN in gp91(phox)-deficient mice. In vitro, challenge with anti-MPO antibody strongly enhanced caspase-1 activity and IL-1β generation in gp91(phox)-deficient and p47(phox)-deficient monocytes compared with wild-type monocytes. This enhanced IL-1β generation was abrogated when caspase-1 was blocked. ANCA-induced superoxide and IL-1β generation were inversely related in human monocytes. Furthermore, transplantation of gp91(phox)/caspase-1 double-deficient bone marrow rescued the accelerated NCGN phenotype in gp91(phox) bone marrow-deficient mice. These results suggest that Phox-generated reactive oxygen species downregulate caspase-1, thereby keeping the inflammasome in check and limiting ANCA-induced inflammation. IL-1 receptor blockade may provide a promising strategy in NCGN, whereas our data question the benefit of antioxidants.
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Affiliation(s)
- Adrian Schreiber
- Experimental and Clinical Research Center at the Max-Delbrueck-Centrum Berlin and Campus Virchow Clinic, Medical Faculty of the Charité, Department of Nephrology and Intensive Care Medicine, Charité Berlin, Berlin, Germany
| | - Friedrich C Luft
- Experimental and Clinical Research Center at the Max-Delbrueck-Centrum Berlin and
| | - Ralph Kettritz
- Experimental and Clinical Research Center at the Max-Delbrueck-Centrum Berlin and Campus Virchow Clinic, Medical Faculty of the Charité, Department of Nephrology and Intensive Care Medicine, Charité Berlin, Berlin, Germany
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23
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Abstract
SIGNIFICANCE Reactive oxygen species (ROS) play a critical role in vascular disease. While there are many possible sources of ROS, nicotinamide adenine dinucleotide phosphate (NADPH) oxidases play a central role. They are a source of "kindling radicals," which affect other enzymes, such as nitric oxide synthase endothelial nitric oxide synthase or xanthine oxidase. This is important, as risk factors for atherosclerosis (hypertension, diabetes, hypercholesterolemia, and smoking) regulate the expression and activity of NADPH oxidases in the vessel wall. RECENT ADVANCES There are seven isoforms in mammals: Nox1, Nox2, Nox3, Nox4, Nox5, Duox1 and Duox2. Nox1, Nox2, Nox4, and Nox5 are expressed in endothelium, vascular smooth muscle cells, fibroblasts, or perivascular adipocytes. Other homologues have not been found or are expressed at very low levels; their roles have not been established. Nox1/Nox2 promote the development of endothelial dysfunction, hypertension, and inflammation. Nox4 may have a role in protecting the vasculature during stress; however, when its activity is increased, it may be detrimental. Calcium-dependent Nox5 has been implicated in oxidative damage in human atherosclerosis. CRITICAL ISSUES NADPH oxidase-derived ROS play a role in vascular pathology as well as in the maintenance of normal physiological vascular function. We also discuss recently elucidated mechanisms such as the role of NADPH oxidases in vascular protection, vascular inflammation, pulmonary hypertension, tumor angiogenesis, and central nervous system regulation of vascular function and hypertension. FUTURE DIRECTIONS Understanding the role of individual oxidases and interactions between homologues in vascular disease is critical for efficient pharmacological regulation of vascular NADPH oxidases in both the laboratory and clinical practice.
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Affiliation(s)
- Anna Konior
- 1 Department of Internal Medicine, Jagiellonian University School of Medicine , Cracow, Poland
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The linker histone h1.2 is an intermediate in the apoptotic response to cytokine deprivation in T-effectors. Int J Cell Biol 2014; 2014:674753. [PMID: 24688545 PMCID: PMC3943393 DOI: 10.1155/2014/674753] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Revised: 01/03/2014] [Accepted: 01/05/2014] [Indexed: 11/17/2022] Open
Abstract
Tissue homeostasis is a dynamic process involving proliferation and the removal of redundant or damaged cells. This is exemplified in the coordinated deletion—triggered by limiting trophic factors/cytokines in the extracellular milieu—of differentiated T cells overproduced during the mammalian immune response. However, mechanisms by which extracellular cues are perceived and transduced as apoptotic triggers remain incompletely understood. T-effectors are dependent on cytokines for survival and undergo apoptosis following cytokine withdrawal. Here we report that leptomycin B (LMB), an inhibitor of nuclear export machinery, protected T-effectors from apoptosis implicating a nuclear intermediate in the apoptotic pathway. Evidence is presented that the linker histone H1.2 localizes to the cytoplasm, by a mechanism sensitive to regulation by LMB, to activate apoptotic signaling culminating in nuclear and mitochondrial damage in T-effectors in response to cytokine deprivation. H1.2 is detected in a complex with the proapoptotic mitochondrial resident Bak and its subcellular localization regulated by Jun-N-terminal kinase (JNK), an intermediate in the apoptotic cascade in T-effectors. These data suggest that metabolic stressors may impinge on H1.2 dynamics favoring its activity at the mitochondrion, thereby functioning as a molecular switch for T-effector apoptosis.
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T cell activation induces CuZn superoxide dismutase (SOD)-1 intracellular re-localization, production and secretion. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:265-74. [DOI: 10.1016/j.bbamcr.2013.10.020] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 10/21/2013] [Accepted: 10/24/2013] [Indexed: 01/22/2023]
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Prabhu SB, Khalsa JK, Banerjee H, Das A, Srivastava S, Mattoo HR, Thyagarajan K, Tanwar S, Das DS, Majumdar SS, George A, Bal V, Durdik JM, Rath S. Role of apoptosis-inducing factor (Aif) in the T cell lineage. Indian J Med Res 2013; 138:577-90. [PMID: 24434313 PMCID: PMC3928691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Multiple checkpoints regulating finely balanced death-versus-survival decisions characterize both thymic development and peripheral homeostasis of T lymphocytes. While exploring the mechanisms of T cell death involved at various stages during the life of a T cell, we have observed and reported a variety of non-redundant roles for apoptosis inducing factor (Aif), a mitochondrial flavoprotein. Aif is ubiquitously expressed in all cell lineages and functions as an NADH oxidase in its mitochondrial location. It is released following the mitochondrial death signals, whereupon it translocates to the nucleus, binds to DNA and causes large-scale DNA fragmentation. During T cell development, Aif is important for developing thymocytes to navigate the double negative (DN)3 to DN4 transition (beta-selection), via its oxidoreductase property which protects the rapidly proliferating cells from death due to reactive oxygen species (ROS). In peripheral mature T cells, Aif deficiency leads to an increased susceptibility of T cell blasts to activation induced cell death (AICD), possibly mediated by its antioxidant function, and decreased sensitivity to neglect-induced death (NID). Thus, Aif seems to have pro-apoptotic and anti-apoptotic roles in the same lineage in different contexts and at different stages. Surprisingly, in the closely related B lymphocyte lineage, Aif deficiency does not result in any abnormality. These findings generate the possibility of specific T cell dysfunction in human disease caused by Aif deficiency, as well as in mitochondriopathies due to other causes. Also, these data raise questions regarding the basis of lineage-specific consequences of the dysfunction/deficiency of apparently ubiquitous molecules.
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Affiliation(s)
- Savit B. Prabhu
- National Institute of Immunology, New Delhi, India,Reprint requests: Dr Savit B. Prabhu / Dr Satyajit Rath, National Institute of Immunology, Aruna Asaf Ali Road, New Delhi 110 067, India e-mail: /
| | | | - Hridesh Banerjee
- National Institute of Immunology, New Delhi, India,Laboratory of Molecular Biology & Immunology, National Institute of Aging, 251 Bayview Boulevard, Baltimore MD 21224, USA
| | - Abhishek Das
- National Institute of Immunology, New Delhi, India,Immune Disease Institute, Children's Hospital Boston, 3 Blackfan Circle, Boston MA 02115, USA
| | - Smita Srivastava
- National Institute of Immunology, New Delhi, India,Division of Infectious Diseases, Department of Medicine, New York University School of Medicine, Smilow 901, 550 First Avenue, New York NY 10016, USA
| | - Hamid R. Mattoo
- National Institute of Immunology, New Delhi, India,MGH Cancer Center, Building 149, 13th Street, Charlestown, MA 02129, USA
| | - Krishnamurthy Thyagarajan
- National Institute of Immunology, New Delhi, India,Department of Surgery, Medical University of South Carolina, 86 Jonathan Lucas Street, Charleston SC 29425, USA
| | | | | | | | - Anna George
- National Institute of Immunology, New Delhi, India
| | - Vineeta Bal
- National Institute of Immunology, New Delhi, India
| | - Jeannine M. Durdik
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR 72701, USA
| | - Satyajit Rath
- National Institute of Immunology, New Delhi, India,Reprint requests: Dr Savit B. Prabhu / Dr Satyajit Rath, National Institute of Immunology, Aruna Asaf Ali Road, New Delhi 110 067, India e-mail: /
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Alberici LC, Paim BA, Zecchin KG, Mirandola SR, Pestana CR, Castilho RF, Vercesi AE, Oliveira HCF. Activation of the mitochondrial ATP-sensitive K+ channel reduces apoptosis of spleen mononuclear cells induced by hyperlipidemia. Lipids Health Dis 2013; 12:87. [PMID: 23764148 PMCID: PMC3693968 DOI: 10.1186/1476-511x-12-87] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 06/10/2013] [Indexed: 01/09/2023] Open
Abstract
Background We have previously demonstrated that increased rates of superoxide generation by extra-mitochondrial enzymes induce the activation of the mitochondrial ATP-sensitive potassium channel (mitoKATP) in the livers of hypertriglyceridemic (HTG) mice. The resulting mild uncoupling mediated by mitoKATP protects mitochondria against oxidative damage. In this study, we investigate whether immune cells from HTG mice also present increased mitoKATP activity and evaluate the influence of this trait on cell redox state and viability. Methods Oxygen consumption (Clark-type electrode), reactive oxygen species production (dihydroethidium and H2-DCF-DA probes) and cell death (annexin V, cytocrome c release and Trypan blue exclusion) were determined in spleen mononuclear cells. Results HTG mice mononuclear cells displayed increased mitoKATP activity, as evidenced by higher resting respiration rates that were sensitive to mitoKATP antagonists. Whole cell superoxide production and apoptosis rates were increased in HTG cells. Inhibition of mitoKATP further increased the production of reactive oxygen species and apoptosis in these cells. Incubation with HTG serum induced apoptosis more strongly in WT cells than in HTG mononuclear cells. Cytochrome c release into the cytosol and caspase 8 activity were both increased in HTG cells, indicating that cell death signaling starts upstream of the mitochondria but does involve this organelle. Accordingly, a reduced number of blood circulating lymphocytes was found in HTG mice. Conclusions These results demonstrate that spleen mononuclear cells from hyperlipidemic mice have more active mitoKATP channels, which downregulate mitochondrial superoxide generation. The increased apoptosis rate observed in these cells is exacerbated by closing the mitoKATP channels. Thus, mitoKATP opening acts as a protective mechanism that reduces cell death induced by hyperlipidemia.
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Affiliation(s)
- Luciane C Alberici
- Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, SP, Brazil
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Kamiński MM, Röth D, Krammer PH, Gülow K. Mitochondria as oxidative signaling organelles in T-cell activation: physiological role and pathological implications. Arch Immunol Ther Exp (Warsz) 2013; 61:367-84. [PMID: 23749029 DOI: 10.1007/s00005-013-0235-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 05/13/2013] [Indexed: 12/22/2022]
Abstract
Early scientific reports limited the cell biological role of reactive oxygen species (ROS) to the cause of pathological damage. However, extensive research performed over the last decade led to a wide recognition of intracellular oxidative/redox signaling as a crucial mechanism of homeostatic regulation. Amongst different cellular processes known to be influenced by redox signaling, T-cell activation is one of the most established. Numerous studies reported an indispensible role for ROS as modulators of T-cell receptor-induced transcription. Nevertheless, mechanistic details regarding signaling pathways triggered by ROS are far from being delineated. The nature and interplay between enzymatic sources involved in the generation of "oxidative signals" are also a matter of ongoing research. In particular, active participation of the mitochondrial respiratory chain as ROS producer constitutes an intriguing issue with various implications for bioenergetics of activated T cells as well as for T-cell-mediated pathologies. The aim of the current review is to address these interesting concepts.
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Affiliation(s)
- Marcin M Kamiński
- Tumour Immunology Program, Division of Immunogenetics (D030), German Cancer Research Center (DKFZ), Heidelberg, Germany,
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Kesarwani P, Murali AK, Al-Khami AA, Mehrotra S. Redox regulation of T-cell function: from molecular mechanisms to significance in human health and disease. Antioxid Redox Signal 2013; 18:1497-534. [PMID: 22938635 PMCID: PMC3603502 DOI: 10.1089/ars.2011.4073] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Reactive oxygen species (ROS) are thought to have effects on T-cell function and proliferation. Low concentrations of ROS in T cells are a prerequisite for cell survival, and increased ROS accumulation can lead to apoptosis/necrosis. The cellular redox state of a T cell can also affect T-cell receptor signaling, skewing the immune response. Various T-cell subsets have different redox statuses, and this differential ROS susceptibility could modulate the outcome of an immune response in various disease states. Recent advances in T-cell redox signaling reveal that ROS modulate signaling cascades such as the mitogen-activated protein kinase, phosphoinositide 3-kinase (PI3K)/AKT, and JAK/STAT pathways. Also, tumor microenvironments, chronic T-cell stimulation leading to replicative senescence, gender, and age affect T-cell susceptibility to ROS, thereby contributing to diverse immune outcomes. Antioxidants such as glutathione, thioredoxin, superoxide dismutase, and catalase balance cellular oxidative stress. T-cell redox states are also regulated by expression of various vitamins and dietary compounds. Changes in T-cell redox regulation may affect the pathogenesis of various human diseases. Many strategies to control oxidative stress have been employed for various diseases, including the use of active antioxidants from dietary products and pharmacologic or genetic engineering of antioxidant genes in T cells. Here, we discuss the existence of a complex web of molecules/factors that exogenously or endogenously affect oxidants, and we relate these molecules to potential therapeutics.
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Affiliation(s)
- Pravin Kesarwani
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
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30
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Lang PA, Xu HC, Grusdat M, McIlwain DR, Pandyra AA, Harris IS, Shaabani N, Honke N, Maney SK, Lang E, Pozdeev VI, Recher M, Odermatt B, Brenner D, Häussinger D, Ohashi PS, Hengartner H, Zinkernagel RM, Mak TW, Lang KS. Reactive oxygen species delay control of lymphocytic choriomeningitis virus. Cell Death Differ 2013; 20:649-58. [PMID: 23328631 PMCID: PMC3595491 DOI: 10.1038/cdd.2012.167] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Cluster of differentiation (CD)8(+) T cells are like a double edged sword during chronic viral infections because they not only promote virus elimination but also induce virus-mediated immunopathology. Elevated levels of reactive oxygen species (ROS) have been reported during virus infections. However, the role of ROS in T-cell-mediated immunopathology remains unclear. Here we used the murine lymphocytic choriomeningitis virus to explore the role of ROS during the processes of virus elimination and induction of immunopathology. We found that virus infection led to elevated levels of ROS producing granulocytes and macrophages in virus-infected liver and spleen tissues that were triggered by the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase. Lack of the regulatory subunit p47phox of the NADPH oxidase diminished ROS production in these cells. While CD8(+) T cells exhibited ROS production that was independent of NADPH oxidase expression, survival and T-cell function was elevated in p47phox-deficient (Ncf1(-/-)) mice. In the absence of p47phox, enhanced T-cell immunity promoted virus elimination and blunted corresponding immunopathology. In conclusion, we find that NADPH-mediated production of ROS critically impairs the immune response, impacting elimination of virus and outcome of liver cell damage.
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Affiliation(s)
- P A Lang
- Institute of Experimental Immunology, University Hospital of Zurich, Schmelzbergstrasse 12, Zurich 8091, Switzerland
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31
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Selenium in bone health: roles in antioxidant protection and cell proliferation. Nutrients 2013; 5:97-110. [PMID: 23306191 PMCID: PMC3571640 DOI: 10.3390/nu5010097] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 12/17/2012] [Accepted: 01/03/2013] [Indexed: 12/25/2022] Open
Abstract
Selenium (Se) is an essential trace element for humans and animals, and several findings suggest that dietary Se intake may be necessary for bone health. Such findings may relate to roles of Se in antioxidant protection, enhanced immune surveillance and modulation of cell proliferation. Elucidation of the mechanisms by which Se supports these cellular processes can lead to a better understanding of the role of this nutrient in normal bone metabolism. This article reviews the current knowledge concerning the molecular functions of Se relevant to bone health.
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Purushothaman D, Marcel N, Garg M, Venkataraman R, Sarin A. Apoptotic programs are determined during lineage commitment of CD4+ T effectors: selective regulation of T effector-memory apoptosis by inducible nitric oxide synthase. THE JOURNAL OF IMMUNOLOGY 2012; 190:97-105. [PMID: 23225886 DOI: 10.4049/jimmunol.1103694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Lineage-committed T effectors generated in response to Ag during the inflammatory phase are destined to die during termination of the immune response. We present evidence to suggest that molecular signatures of lineage commitment are reflected in apoptotic cascades activated in CD4(+) T effectors. Exemplifying this, ablation of inducible NO synthase (iNOS) protected effector-memory T (TEM) cells, but not T(Naive) or central-memory T cells, activated in vitro, from apoptosis triggered by cytokine deprivation. Furthermore, attrition of T effectors generated in the secondary, but not the primary, response to Ag was substantially reduced in mice, which received iNOS inhibitors. Distinct patterns of iNOS expression were revealed in wild-type TEM effectors undergoing apoptosis, and ablation of iNOS protein in primary and TEM wild-type effectors confirmed observations made in iNOS(-/-) cells. Describing molecular correlates of this dependence, mitochondrial damage, activation of the protein Bax, and release from mitochondria of the apoptosis-inducing factor were selectively abrogated in iNOS(-/-) TEM effectors. Suggesting that iNOS dependence was linked to the functional identity of T cell subsets, both iNOS induction and apoptosis were compromised in IFN-γ(-/-) TEM effectors, which mirrored the response patterns of iNOS(-)(/)(-) TEM. Collectively, these observations suggest that programs regulating deletion and differentiation are closely integrated and likely encoded during lineage commitment of T effectors.
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Affiliation(s)
- Divya Purushothaman
- National Centre for Biological Sciences, Bangalore 560065, Karnataka, India.
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33
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Shatynski KE, Chen H, Kwon J, Williams MS. Decreased STAT5 phosphorylation and GATA-3 expression in NOX2-deficient T cells: role in T helper development. Eur J Immunol 2012; 42:3202-11. [PMID: 22930452 PMCID: PMC3691816 DOI: 10.1002/eji.201242659] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 07/15/2012] [Accepted: 08/20/2012] [Indexed: 01/26/2023]
Abstract
Absence of phagocyte NADPH oxidase (NOX2) activity causes chronic granulomatous disease (CGD), a primary immunodeficiency characterized by recurrent bacterial infections. In contrast to this innate immune deficit, CGD patients and animal models display a predisposition toward autoimmune disease and enhanced response to Helicobacter pylori and influenza virus infection. These data imply an altered, perhaps augmented, adaptive immune response in CGD. As previous data demonstrated functional NOX2 expression in T cells, our goal here was to determine if NOX2-deficient T cells are inherently altered in their responses. Activation of purified naive CD4(+) T cells from NOX2-deficient mice led to augmented IFN-γ and diminished IL-4 production and an increased ratio of expression of the T(H)1-specific transcription factor T-bet versus the T(H)2-specfic transcription factor GATA-3, consistent with a T(H)1 skewing of naïve T cells. Selective inhibition of TCR-induced STAT5 phosphorylation was identified as a potential mechanism for skewed T helper differentiation. Exposure to antioxidants inhibited, while pro-oxidants augmented T(H)2 cytokine secretion and STAT5 phosphorylation, supporting the redox dependence of these signaling changes. These data suggest that TCR-induced ROS generation from NOX2 activation can regulate the adaptive immune response in a T-cell-inherent fashion, and propose a possible role for redox signaling in T helper differentiation.
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MESH Headings
- Animals
- Bacterial Infections/enzymology
- Bacterial Infections/genetics
- Bacterial Infections/immunology
- Cell Differentiation/genetics
- Cell Differentiation/immunology
- GATA3 Transcription Factor/biosynthesis
- GATA3 Transcription Factor/genetics
- GATA3 Transcription Factor/immunology
- Granulomatous Disease, Chronic/genetics
- Granulomatous Disease, Chronic/immunology
- Granulomatous Disease, Chronic/metabolism
- Interferon-gamma/genetics
- Interferon-gamma/immunology
- Interferon-gamma/metabolism
- Interleukin-4/genetics
- Interleukin-4/immunology
- Interleukin-4/metabolism
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/immunology
- Membrane Glycoproteins/metabolism
- Mice
- Mice, Knockout
- NADPH Oxidase 2
- NADPH Oxidases/genetics
- NADPH Oxidases/immunology
- NADPH Oxidases/metabolism
- Oxidation-Reduction
- Phosphorylation/genetics
- Phosphorylation/immunology
- Reactive Oxygen Species/immunology
- Reactive Oxygen Species/metabolism
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/immunology
- Receptors, Antigen, T-Cell/metabolism
- STAT5 Transcription Factor/genetics
- STAT5 Transcription Factor/immunology
- STAT5 Transcription Factor/metabolism
- Signal Transduction/genetics
- Signal Transduction/immunology
- Th1 Cells/immunology
- Th1 Cells/metabolism
- Th1 Cells/pathology
- Th2 Cells/immunology
- Th2 Cells/metabolism
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Affiliation(s)
- Kristen E. Shatynski
- Department of Microbiology and Immunology, Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, 800 W. Baltimore Street, Baltimore, MD 21201
| | - Haiyan Chen
- Department of Microbiology and Immunology, Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, 800 W. Baltimore Street, Baltimore, MD 21201
| | - Jaeyul Kwon
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 12441 Parklawn Drive, Rockville, MD 20852
| | - Mark S. Williams
- Department of Microbiology and Immunology, Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, 800 W. Baltimore Street, Baltimore, MD 21201
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Developmental heterogeneity in DNA packaging patterns influences T-cell activation and transmigration. PLoS One 2012; 7:e43718. [PMID: 22957031 PMCID: PMC3434176 DOI: 10.1371/journal.pone.0043718] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 07/26/2012] [Indexed: 11/24/2022] Open
Abstract
Cellular differentiation programs are accompanied by large-scale changes in nuclear organization and gene expression. In this context, accompanying transitions in chromatin assembly that facilitates changes in gene expression and cell behavior in a developmental system are poorly understood. Here, we address this gap and map structural changes in chromatin organization during murine T-cell development, to describe an unusual heterogeneity in chromatin organization and associated functional correlates in T-cell lineage. Confocal imaging of DNA assembly in cells isolated from bone marrow, thymus and spleen reveal the emergence of heterogeneous patterns in DNA organization in mature T-cells following their exit from the thymus. The central DNA pattern dominated in immature precursor cells in the thymus whereas both central and peripheral DNA patterns were observed in naïve and memory cells in circulation. Naïve T-cells with central DNA patterns exhibited higher mechanical pliability in response to compressive loads in vitro and transmigration assays in vivo, and demonstrated accelerated expression of activation-induced marker CD69. T-cell activation was characterized by marked redistribution of DNA assembly to a central DNA pattern and increased nuclear size. Notably, heterogeneity in DNA patterns recovered in cells induced into quiescence in culture, suggesting an internal regulatory mechanism for chromatin reorganization. Taken together, our results uncover an important component of plasticity in nuclear organization, reflected in chromatin assembly, during T-cell development, differentiation and transmigration.
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Hara-Chikuma M, Chikuma S, Sugiyama Y, Kabashima K, Verkman AS, Inoue S, Miyachi Y. Chemokine-dependent T cell migration requires aquaporin-3-mediated hydrogen peroxide uptake. ACTA ACUST UNITED AC 2012; 209:1743-52. [PMID: 22927550 PMCID: PMC3457725 DOI: 10.1084/jem.20112398] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The water/glycerol channel aquaporin-3 is required for chemokine-dependent T cell migration during immune responses. Chemokine-dependent trafficking is indispensable for the effector function of antigen-experienced T cells during immune responses. In this study, we report that the water/glycerol channel aquaporin-3 (AQP3) is expressed on T cells and regulates their trafficking in cutaneous immune reactions. T cell migration toward chemokines is dependent on AQP3-mediated hydrogen peroxide (H2O2) uptake but not the canonical water/glycerol transport. AQP3-mediated H2O2 transport is essential for the activation of the Rho family GTPase Cdc42 and the subsequent actin dynamics. Coincidentally, AQP3-deficient mice are defective in the development of hapten-induced contact hypersensitivity, which is attributed to the impaired trafficking of antigen-primed T cells to the hapten-challenged skin. We therefore suggest that AQP3-mediated H2O2 uptake is required for chemokine-dependent T cell migration in sufficient immune response.
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Affiliation(s)
- Mariko Hara-Chikuma
- Department of Dermatology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
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PP2A-dependent control of transcriptionally active FOXO3a in CD8(+) central memory lymphocyte survival requires p47(phox). Cell Death Dis 2012; 3:e375. [PMID: 22914323 PMCID: PMC3434656 DOI: 10.1038/cddis.2012.118] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Forkhead box O3a (FOXO3a) transcription factor is regulated by complex post-translational modifications that allow for transcriptional control of various apoptosis factors including pro-apoptotic Bim. Although it has been shown that kinases phosphorylate FOXO3a in memory T cells, the role of protein phosphatases in the control of memory T lymphocyte FOXO3a function is less clear. Here, we report that FOXO3a is dephosphorylated (activated) by a protein phosphatase 2A (PP2A)-dependent mechanism in CD8+ memory lymphocytes (Tm) during Listeria monocytogenes (Lm) infection, which allows for enhanced Bim transcription in nicotinamide adenine dinucleotide phosphate-oxidase p47phox-deficient (p47phox−/−) Tm. Consequently, CD8+ Tm from Lm-infected p47phox−/− mice express significantly higher levels of each pro-apoptotic Bim protein isoform. Furthermore, there was a profound reduction in the accumulation of CD8+ T central memory (Tcm) cells in infected p47phox−/− spleens, and 65% p47phox−/− mouse moribundity following secondary Lm reinfection compared with 25% in wild-type mice. Notably, blocking PP2A activity attenuated FOXO3 activation and Bim transcription in p47phox−/− CD8+ memory lymphocytes. Our findings indicate a critical role for p47phox in a dynamic interplay between PP2A and FOXO3a that regulates pro-apoptotic Bim transcription in CD8+ memory lymphocytes during infection.
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Perumalsamy LR, Marcel N, Kulkarni S, Radtke F, Sarin A. Distinct spatial and molecular features of notch pathway assembly in regulatory T cells. Sci Signal 2012; 5:ra53. [PMID: 22827997 DOI: 10.1126/scisignal.2002859] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Variations in the spatial localization of signaling components and crosstalk among signaling cascades are mechanisms through which diversity in signaling networks is generated. The receptor Notch provides an example of regulation by spatial localization: In the canonical Notch signaling pathway, Notch is cleaved to produce the Notch intracellular domain (NICD, also known as NIC), which translocates to the nucleus to regulate gene expression. We describe a T cell receptor-dependent, non-nuclear distribution and function of the processed receptor Notch, which was associated with the improved survival of regulatory T cells (T(regs)) in vitro and in vivo and was compromised by T cell-specific deletion of Notch1. Unlike a nuclear-restricted mutant of NICD, mutant NICD that underwent nuclear export or was targeted to the plasma membrane protected Notch1(-/-) T(regs) from apoptosis induced by nutrient deprivation and oxidative stress. Notch signaling integrated with phosphatidylinositol 3-kinase signaling and mammalian target of rapamycin complex 2 (mTORC2) for this cell survival function. Biochemical and imaging approaches revealed a membrane-proximal complex containing NICD and the mTORC2 component Rictor, and this complex was stabilized by specific interactions with the Notch ligand Delta-like-1 and mediated the survival of T(regs). Together, our evidence for the spatial control of Notch and the crosstalk of Notch signaling with other pathways reveals coupling between the localization of Notch and diverse intracellular signaling pathways.
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Affiliation(s)
- Lakshmi R Perumalsamy
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bangalore 560065, India
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Logan MR, Jordan-Williams KL, Poston S, Liao J, Taparowsky EJ. Overexpression of Batf induces an apoptotic defect and an associated lymphoproliferative disorder in mice. Cell Death Dis 2012; 3:e310. [PMID: 22592317 PMCID: PMC3366083 DOI: 10.1038/cddis.2012.49] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Activator protein-1 (AP-1) is a dimeric transcription factor composed of the Jun, Fos and Atf families of proteins. Batf is expressed in the immune system and participates in AP-1 dimers that modulate gene expression in response to a variety of stimuli. Transgenic (Tg) mice overexpressing human BATF in T cells were generated using the human CD2 promoter (CD2-HA (hemagglutinin antigen) - BATF). By 1 year of age, over 90% of the mice developed a lymphoproliferative disorder (LPD). The enlarged lymph nodes characteristic of this LPD contain a polyclonal accumulation of T cells with a CD4+ bias, yet efforts to propagate these tumor cells in vitro demonstrate that they do not proliferate as well as wild-type CD4+ T cells. Instead, the accumulation of these cells is likely due to an apoptotic defect as CD2-HA-BATF Tg T cells challenged by trophic factor withdrawal in vitro resist apoptosis and display a pro-survival pattern of Bcl-2 family protein expression. As elevated levels of Batf expression are a feature of lymphoid tumors in both humans and mice, these observations support the use of CD2-HA-BATF mice as a model for investigating the molecular details of apoptotic dysregulation in LPD.
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Affiliation(s)
- M R Logan
- Department of Biological Sciences, College of Science, Purdue University, West Lafayette, IN 47907-2064, USA
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Ostanin DV, Kevil CG. Radical innate regulation of autoimmune diabetes. Free Radic Biol Med 2012; 52:1698-9. [PMID: 22373596 PMCID: PMC4413922 DOI: 10.1016/j.freeradbiomed.2012.02.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Dmitry V Ostanin
- Department of Medicine, Louisiana State University Health Sciences Center, Shreveport, LA 71130-3932, USA.
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Brait VH, Arumugam TV, Drummond GR, Sobey CG. Importance of T lymphocytes in brain injury, immunodeficiency, and recovery after cerebral ischemia. J Cereb Blood Flow Metab 2012; 32:598-611. [PMID: 22293986 PMCID: PMC3318155 DOI: 10.1038/jcbfm.2012.6] [Citation(s) in RCA: 152] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Following an ischemic stroke, T lymphocytes become activated, infiltrate the brain, and appear to release cytokines and reactive oxygen species to contribute to early inflammation and brain injury. However, some subsets of T lymphocytes may be beneficial even in the early stages after a stroke, and recent evidence suggests that T lymphocytes can also contribute to the repair and regeneration of the brain at later stages. In the hours to days after stroke, T-lymphocyte numbers are then reduced in the blood and in secondary lymphoid organs as part of a 'stroke-induced immunodeficiency syndrome,' which is mediated by hyperactivity of the sympathetic nervous system and the hypothalamic-pituitary-adrenal axis, resulting in increased risk of infectious complications. Whether or not poststroke T-lymphocyte activation occurs via an antigen-independent process, as opposed to a classical antigen-dependent process, is still controversial. Although considerable recent progress has been made, a better understanding of the roles of the different T-lymphocyte subpopulations and their temporal profile of damage versus repair will help to clarify whether T-lymphocyte targeting may be a viable poststroke therapy for clinical use.
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Affiliation(s)
- Vanessa H Brait
- Vascular Biology and Immunopharmacology Group, Department of Pharmacology, Monash University, Clayton, Victoria, Australia
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Abstract
The unique chemistry of oxygen has been both a resource and threat for life on Earth for at least the last 2.4 billion years. Reduction of oxygen to water allows extraction of more metabolic energy from organic fuels than is possible through anaerobic glycolysis. On the other hand, partially reduced oxygen can react indiscriminately with biomolecules to cause genetic damage, disease, and even death. Organisms in all three superkingdoms of life have developed elaborate mechanisms to protect against such oxidative damage and to exploit reactive oxygen species as sensors and signals in myriad processes. The sulfur amino acids, cysteine and methionine, are the main targets of reactive oxygen species in proteins. Oxidative modifications to cysteine and methionine can have profound effects on a protein's activity, structure, stability, and subcellular localization. Non-reversible oxidative modifications (oxidative damage) may contribute to molecular, cellular, and organismal aging and serve as signals for repair, removal, or programmed cell death. Reversible oxidation events can function as transient signals of physiological status, extracellular environment, nutrient availability, metabolic state, cell cycle phase, immune function, or sensory stimuli. Because of its chemical similarity to sulfur and stronger nucleophilicity and acidity, selenium is an extremely efficient catalyst of reactions between sulfur and oxygen. Most of the biological activity of selenium is due to selenoproteins containing selenocysteine, the 21st genetically encoded protein amino acid. The most abundant selenoproteins in mammals are the glutathione peroxidases (five to six genes) that reduce hydrogen peroxide and lipid hydroperoxides at the expense of glutathione and serve to limit the strength and duration of reactive oxygen signals. Thioredoxin reductases (three genes) use nicotinamide adenine dinucleotide phosphate to reduce oxidized thioredoxin and its homologs, which regulate a plethora of redox signaling events. Methionine sulfoxide reductase B1 reduces methionine sulfoxide back to methionine using thioredoxin as a reductant. Several selenoproteins in the endoplasmic reticulum are involved in the regulation of protein disulfide formation and unfolded protein response signaling, although their precise biological activities have not been determined. The most widely distributed selenoprotein family in Nature is represented by the highly conserved thioredoxin-like selenoprotein W and its homologs that have not yet been assigned specific biological functions. Recent evidence suggests selenoprotein W and the six other small thioredoxin-like mammalian selenoproteins may serve to transduce hydrogen peroxide signals into regulatory disulfide bonds in specific target proteins.
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Affiliation(s)
- Wayne Chris Hawkes
- USDA Agricultural Research Service, Western Human Nutrition Research Center, University of California at Davis, Davis, USA
| | - Zeynep Alkan
- USDA Agricultural Research Service, Western Human Nutrition Research Center, University of California at Davis, Davis, USA
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Purushothaman D, Sarin A. Cytokine-dependent regulation of NADPH oxidase activity and the consequences for activated T cell homeostasis. J Biophys Biochem Cytol 2009. [DOI: 10.1083/jcb1857oia14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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