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McKenna E, Mhaonaigh AU, Wubben R, Dwivedi A, Hurley T, Kelly LA, Stevenson NJ, Little MA, Molloy EJ. Neutrophils: Need for Standardized Nomenclature. Front Immunol 2021; 12:602963. [PMID: 33936029 PMCID: PMC8081893 DOI: 10.3389/fimmu.2021.602963] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 03/17/2021] [Indexed: 12/15/2022] Open
Abstract
Neutrophils are the most abundant innate immune cell with critical anti-microbial functions. Since the discovery of granulocytes at the end of the nineteenth century, the cells have been given many names including phagocytes, polymorphonuclear neutrophils (PMN), granulocytic myeloid derived suppressor cells (G-MDSC), low density neutrophils (LDN) and tumor associated neutrophils (TANS). This lack of standardized nomenclature for neutrophils suggest that biologically distinct populations of neutrophils exist, particularly in disease, when in fact these may simply be a manifestation of the plasticity of the neutrophil as opposed to unique populations. In this review, we profile the surface markers and granule expression of each stage of granulopoiesis to offer insight into how each stage of maturity may be identified. We also highlight the remarkable surface marker expression profiles between the supposed neutrophil populations.
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Affiliation(s)
- Ellen McKenna
- Discipline of Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Paediatric Research Laboratory, Trinity Translational Medicine Institute (TTMI), St James' Hospital, Dublin, Ireland
| | | | - Richard Wubben
- Viral Immunology Group, School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Dublin, Ireland
| | - Amrita Dwivedi
- Trinity Health Kidney Centre, TTMI, Trinity College, Dublin, Ireland
| | - Tim Hurley
- Discipline of Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Paediatric Research Laboratory, Trinity Translational Medicine Institute (TTMI), St James' Hospital, Dublin, Ireland.,Neonatology, Coombe Women and Infant's University Hospital, Dublin, Ireland
| | - Lynne A Kelly
- Discipline of Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Paediatric Research Laboratory, Trinity Translational Medicine Institute (TTMI), St James' Hospital, Dublin, Ireland.,National Children's Research Centre, Dublin, Ireland
| | - Nigel J Stevenson
- Viral Immunology Group, School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Dublin, Ireland.,Viral Immunology Group, Royal College of Surgeons in Ireland-Medical University of Bahrain, Zallaq, Bahrain
| | - Mark A Little
- Trinity Health Kidney Centre, TTMI, Trinity College, Dublin, Ireland.,Irish Centre for Vascular Biology, Trinity College Dublin, Dublin, Ireland
| | - Eleanor J Molloy
- Discipline of Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Paediatric Research Laboratory, Trinity Translational Medicine Institute (TTMI), St James' Hospital, Dublin, Ireland.,Neonatology, Coombe Women and Infant's University Hospital, Dublin, Ireland.,National Children's Research Centre, Dublin, Ireland.,Neonatology, Children's Hospital Ireland (CHI) at Crumlin, Dublin, Ireland.,Paediatrics, CHI at Tallaght, Tallaght University Hospital, Dublin, Ireland
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2
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Age-Dependent Oxidative Stress Elevates Arginase 1 and Uncoupled Nitric Oxide Synthesis in Skeletal Muscle of Aged Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:1704650. [PMID: 31205583 PMCID: PMC6530149 DOI: 10.1155/2019/1704650] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 03/04/2019] [Indexed: 12/21/2022]
Abstract
Aging is associated with reduced muscle mass (sarcopenia) and poor bone quality (osteoporosis), which together increase the incidence of falls and bone fractures. It is widely appreciated that aging triggers systemic oxidative stress, which can impair myoblast cell survival and differentiation. We previously reported that arginase plays an important role in oxidative stress-dependent bone loss. We hypothesized that arginase activity is dysregulated with aging in muscles and may be involved in muscle pathophysiology. To investigate this, we analyzed arginase activity and its expression in skeletal muscles of young and aged mice. We found that arginase activity and arginase 1 expression were significantly elevated in aged muscles. We also demonstrated that SOD2, GPx1, and NOX2 increased with age in skeletal muscle. Most importantly, we also demonstrated elevated levels of peroxynitrite formation and uncoupling of eNOS in aged muscles. Our in vitro studies using C2C12 myoblasts showed that the oxidative stress treatment increased arginase activity, decreased cell survival, and increased apoptotic markers. These effects were reversed by treatment with an arginase inhibitor, 2(S)-amino-6-boronohexanoic acid (ABH). Our study provides strong evidence that L-arginine metabolism is altered in aged muscle and that arginase inhibition could be used as a novel therapeutic target for age-related muscle complications.
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Al Hanai AH, Antkiewicz DS, Hemming JDC, Shafer MM, Lai AM, Arhami M, Hosseini V, Schauer JJ. Seasonal variations in the oxidative stress and inflammatory potential of PM 2.5 in Tehran using an alveolar macrophage model; The role of chemical composition and sources. ENVIRONMENT INTERNATIONAL 2019; 123:417-427. [PMID: 30622066 DOI: 10.1016/j.envint.2018.12.023] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 12/11/2018] [Accepted: 12/11/2018] [Indexed: 06/09/2023]
Abstract
The current study was designed to assess the association between temporal variations in urban PM2.5 chemical composition, sources, and the oxidative stress and inflammatory response in an alveolar macrophage (AM) model. A year-long sampling campaign collected PM2.5 samples at the Sharif University in Tehran, Iran. PM-induced reactive oxygen species (ROS) production was measured both with an acellular dithiothreitol consumption assay (DTT-ROS; ranged from 2.1 to 9.3 nmoles min-1 m-3) and an in vitro macrophage-mediated ROS production assay (AM-ROS; ranged from 125 to 1213 μg Zymosan equivalents m-3). The production of tumor necrosis factor alpha (TNF-α; ranged from ~60 to 518 pg TNF-α m-3) was quantified as a marker of the inflammatory potential of the PM. PM-induced DTT-ROS and AM-ROS were substantially higher for the colder months' PM (1.5-fold & 3-fold, respectively) compared with warm season. Vehicular emission tracers, aliphatic diacids, and hopanes exhibited moderate correlation with ROS measures. TNF-α secretion exhibited a markedly different pattern than ROS activity with a 2-fold increase in the warm months compared to the rest of the year. Gasoline vehicles and residual oil combustion were moderately associated with both ROS measures (R ≥ 0.67, p < 0.05), while diesel vehicles exhibited a strong correlation with secreted TNF-α in the cold season (R = 0.89, p < 0.05). mRNA expression of fourteen genes including antioxidant response and pro-inflammatory markers were found to be differentially modulated in our AM model. HMOX1, an antioxidant response gene, was up-regulated throughout the year. Pro-inflammatory genes (e.g. TNF-α and IL1β) were down-regulated in the cold season and displayed moderate to weak correlation with crustal elements (R > 0.5, p < 0.05). AM-ROS activity showed an inverse relationship with genes including SOD2, TNF, IL1β and IL6 (R ≥ -0.66, p < 0.01). Our findings indicate that Tehran's PM2.5 has the potential to induce oxidative stress and inflammation responses in vitro. In the current study, these responses included NRF2, NF-κB and MAPK pathways.
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Affiliation(s)
- Ahlam H Al Hanai
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, USA
| | | | | | - Martin M Shafer
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, USA; Wisconsin State Laboratory of Hygiene, Madison, WI, USA
| | - Alexandra M Lai
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, USA
| | | | | | - James J Schauer
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, USA; Wisconsin State Laboratory of Hygiene, Madison, WI, USA.
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4
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Uribe-Querol E, Rosales C. Control of Phagocytosis by Microbial Pathogens. Front Immunol 2017; 8:1368. [PMID: 29114249 PMCID: PMC5660709 DOI: 10.3389/fimmu.2017.01368] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Accepted: 10/05/2017] [Indexed: 12/17/2022] Open
Abstract
Phagocytosis is a fundamental process of cells to capture and ingest foreign particles. Small unicellular organisms such as free-living amoeba use this process to acquire food. In pluricellular organisms, phagocytosis is a universal phenomenon that all cells are able to perform (including epithelial, endothelial, fibroblasts, etc.), but some specialized cells (such as neutrophils and macrophages) perform this very efficiently and were therefore named professional phagocytes by Rabinovitch. Cells use phagocytosis to capture and clear all particles larger than 0.5 µm, including pathogenic microorganisms and cellular debris. Phagocytosis involves a series of steps from recognition of the target particle, ingestion of it in a phagosome (phagocytic vacuole), maturation of this phagosome into a phagolysosome, to the final destruction of the ingested particle in the robust antimicrobial environment of the phagolysosome. For the most part, phagocytosis is an efficient process that eliminates invading pathogens and helps maintaining homeostasis. However, several pathogens have also evolved different strategies to prevent phagocytosis from proceeding in a normal way. These pathogens have a clear advantage to perpetuate the infection and continue their replication. Here, we present an overview of the phagocytic process with emphasis on the antimicrobial elements professional phagocytes use. We also summarize the current knowledge on the microbial strategies different pathogens use to prevent phagocytosis either at the level of ingestion, phagosome formation, and maturation, and even complete escape from phagosomes.
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Affiliation(s)
- Eileen Uribe-Querol
- División de Estudios de Posgrado e Investigación, Facultad de Odontología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Carlos Rosales
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
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Kim SJ, Wong PKY. ROS upregulation during the early phase of retroviral infection plays an important role in viral establishment in the host cell. J Gen Virol 2013; 94:2309-2317. [PMID: 23884362 PMCID: PMC3785033 DOI: 10.1099/vir.0.055228-0] [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] [Indexed: 12/11/2022] Open
Abstract
Recent studies suggest that low levels of reactive oxygen species (ROS) often modulate normal intracellular signalling pathways, determine cell fates and control cell proliferation. We found that infection of astrocytes with the neuropathogenic retrovirus ts1, a mutant of Moloney murine leukemia retrovirus, upregulated ROS at low levels during the early phase of infection. This upregulation of intracellular ROS with downregulation of NADPH levels during the early phase of ts1 infection was a separate event from the upregulation of ROS during the late phase while ts1-mediated cell death occurred. The treatment of apocynin, a potential inhibitor of NADPH oxidase (NOX), inhibited establishment of the ts1 virus in the host cell. These results suggested that ROS generated as a consequence of the activation of NOX may play an important role in the early events of the virus life cycle leading to the establishment of the virus in the host cell. The in vitro results were further supported by an in vivo experiment which showed that the treatment of apocynin decreased viral titre in the ts1-infected mouse brain and increased the lifespan of infected mice. This study provides the first in vitro and in vivo evidence on a mechanism for how ROS are involved in ts1 retrovirus infection and ts1-mediated neurodegenerative disease. Our findings focusing on the early phase of the ts1 retrovirus life cycle could provide a better understanding of retroviral life cycle, which may offer specific therapeutic targets for suppressing viral replication and alleviating neurodegenerative symptoms in a mouse model.
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Affiliation(s)
- Soo Jin Kim
- Department of Molecular Carcinogenesis, The University of Texas, MD Anderson Cancer Center, Smithville, TX, USA
| | - Paul K Y Wong
- Department of Molecular Carcinogenesis, The University of Texas, MD Anderson Cancer Center, Smithville, TX, USA
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6
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Aiken ML, Painter RG, Zhou Y, Wang G. Chloride transport in functionally active phagosomes isolated from Human neutrophils. Free Radic Biol Med 2012; 53:2308-17. [PMID: 23089227 PMCID: PMC3672382 DOI: 10.1016/j.freeradbiomed.2012.10.542] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 10/01/2012] [Accepted: 10/11/2012] [Indexed: 01/05/2023]
Abstract
Chloride anion is critical for hypochlorous acid (HOCl) production and microbial killing in neutrophil phagosomes. However, the molecular mechanism by which this anion is transported to the organelle is poorly understood. In this report, membrane-enclosed and functionally active phagosomes were isolated from human neutrophils by using opsonized paramagnetic latex microspheres and a rapid magnetic separation method. The phagosomes recovered were highly enriched for specific protein markers associated with this organelle such as lysosomal-associated membrane protein-1, myeloperoxidase (MPO), lactoferrin, and NADPH oxidase. When FITC-dextran was included in the phagocytosis medium, the majority of the isolated phagosomes retained the fluorescent label after isolation, indicative of intact membrane structure. Flow cytometric measurement of acridine orange, a fluorescent pH indicator, in the purified phagosomes demonstrated that the organelle in its isolated state was capable of transporting protons to the phagosomal lumen via the vacuolar-type ATPase proton pump (V-ATPase). When NADPH was supplied, the isolated phagosomes constitutively oxidized dihydrorhodamine 123, indicating their ability to produce hydrogen peroxide. The preparations also showed a robust production of HOCl within the phagosomal lumen when assayed with the HOCl-specific fluorescent probe R19-S by flow cytometry. MPO-mediated iodination of the proteins covalently conjugated to the phagocytosed beads was quantitatively measured. Phagosomal uptake of iodide and protein iodination were significantly blocked by chloride channel inhibitors, including CFTRinh-172 and NPPB. Further experiments determined that the V-ATPase-driving proton flux into the isolated phagosomes required chloride cotransport, and the cAMP-activated CFTR chloride channel was a major contributor to the chloride transport. Taken together, the data suggest that the phagosomal preparation described herein retains ion transport properties, and multiple chloride channels including CFTR are responsible for chloride supply to neutrophil phagosomes.
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Affiliation(s)
- Martha L Aiken
- Department of Microbiology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Richard G Painter
- Department of Microbiology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Yun Zhou
- Department of Microbiology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Guoshun Wang
- Department of Microbiology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA; Department of Genetics, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA; Department of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA.
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7
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Effects of oxidation of lysozyme by hypohalous acids and haloamines on enzymatic activity and aggregation. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:1090-6. [DOI: 10.1016/j.bbapap.2012.06.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2012] [Revised: 06/14/2012] [Accepted: 06/19/2012] [Indexed: 12/18/2022]
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8
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van der Vliet A. Nox enzymes in allergic airway inflammation. Biochim Biophys Acta Gen Subj 2011; 1810:1035-44. [PMID: 21397663 DOI: 10.1016/j.bbagen.2011.03.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 02/28/2011] [Accepted: 03/03/2011] [Indexed: 12/30/2022]
Abstract
Chronic airway diseases such as asthma are linked to oxidative environmental factors and are associated with increased production of reactive oxygen species (ROS). Therefore, it is commonly assumed that oxidative stress is an important contributing factor to asthma disease pathogenesis and that antioxidant strategies may be useful in the treatment of asthma. A primary source of ROS production in biological systems is NADPH oxidase (NOX), originally associated primarily with inflammatory cells but currently widely appreciated as an important enzyme system in many cell types, with a wide array of functional properties ranging from antimicrobial host defense to immune regulation and cell proliferation, differentiation and apoptosis. Given the complex nature of asthma disease pathology, involving many lung cell types that all express NOX homologs, it is not surprising that the contributions of NOX-derived ROS to various aspects of asthma development and progression are highly diverse and multifactorial. It is the purpose of the present review to summarize the current knowledge with respect to the functional aspects of NOX enzymes in various pulmonary cell types, and to discuss their potential importance in asthma pathogenesis. This article is part of a Special Issue entitled: Biochemistry of Asthma.
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Affiliation(s)
- Albert van der Vliet
- Department of Pathology, Vermont Lung Cancer, College of Medicine, Universitu of Vermont, Burlington, VT 05405, USA.
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9
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Thomas AE. 50th Annual Scientific Meeting of the British Society for Haematology. Expert Rev Hematol 2010; 3:393-5. [PMID: 21083029 DOI: 10.1586/ehm.10.43] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The 50th Annual Scientific Meeting of the British Society for Haematology was notable, not only for its golden anniversary, but also because it coincided with the eruption of the Icelandic volcano, Eyjafjallajökull, and the ensuing travel chaos. In total, 28 speakers from overseas were unable to reach Edinburgh, including a significant number of British speakers who were stranded. However, owing to the superb efforts of the conference organisers and Edinburgh International Conference Centre staff, teleconferencing equipment was installed and all speakers were contacted and able to give their talks on time. The program, consisting of simultaneous sessions and plenary lectures, covered not only recent advances in clinical and laboratory hematology, but also reflected on the contribution of British hematology to the international arena over the past 50 years.
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Affiliation(s)
- Angela E Thomas
- Department of Haematology, Royal Hospital for Sick Children, Edinburgh EH9 1LF, UK.
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10
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Kandadi MR, Hua Y, Ma H, Li Q, Kuo SR, Frankel AE, Ren J. Anthrax lethal toxin suppresses murine cardiomyocyte contractile function and intracellular Ca2+ handling via a NADPH oxidase-dependent mechanism. PLoS One 2010; 5:e13335. [PMID: 20967205 PMCID: PMC2954163 DOI: 10.1371/journal.pone.0013335] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Accepted: 09/22/2010] [Indexed: 01/10/2023] Open
Abstract
Objectives Anthrax infection is associated with devastating cardiovascular sequelae, suggesting unfavorable cardiovascular effects of toxins originated from Bacillus anthracis namely lethal and edema toxins. This study was designed to examine the direct effect of lethal toxins on cardiomyocyte contractile and intracellular Ca2+ properties. Methods Murine cardiomyocyte contractile function and intracellular Ca2+ handling were evaluated including peak shortening (PS), maximal velocity of shortening/ relengthening (± dL/dt), time-to-PS (TPS), time-to-90% relengthening (TR90), intracellular Ca2+ rise measured as fura-2 fluorescent intensity (ΔFFI), and intracellular Ca2+ decay rate. Stress signaling and Ca2+ regulatory proteins were assessed using Western blot analysis. Results In vitro exposure to a lethal toxin (0.05 – 50 nM) elicited a concentration-dependent depression on cardiomyocyte contractile and intracellular Ca2+ properties (PS, ± dL/dt, ΔFFI), along with prolonged duration of contraction and intracellular Ca2+ decay, the effects of which were nullified by the NADPH oxidase inhibitor apocynin. The lethal toxin significantly enhanced superoxide production and cell death, which were reversed by apocynin. In vivo lethal toxin exposure exerted similar time-dependent cardiomyocyte mechanical and intracellular Ca2+ responses. Stress signaling cascades including MEK1/2, p38, ERK and JNK were unaffected by in vitro lethal toxins whereas they were significantly altered by in vivo lethal toxins. Ca2+ regulatory proteins SERCA2a and phospholamban were also differentially regulated by in vitro and in vivo lethal toxins. Autophagy was drastically triggered although ER stress was minimally affected following lethal toxin exposure. Conclusions Our findings indicate that lethal toxins directly compromised murine cardiomyocyte contractile function and intracellular Ca2+ through a NADPH oxidase-dependent mechanism.
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Affiliation(s)
- Machender R. Kandadi
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, Wyoming, United States of America
| | - Yinan Hua
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, Wyoming, United States of America
| | - Heng Ma
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, Wyoming, United States of America
| | - Qun Li
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, Wyoming, United States of America
| | - Shu-ru Kuo
- Cancer Research Institute of Scott and White Memorial Hospital, Temple, Texas, United States of America
| | - Arthur E. Frankel
- Cancer Research Institute of Scott and White Memorial Hospital, Temple, Texas, United States of America
| | - Jun Ren
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, Wyoming, United States of America
- * E-mail:
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11
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Sarigianni M, Tsapas A, Mikhailidis DP, Kaloyianni M, Koliakos G, Paletas K. Involvement of signaling molecules on na/h exchanger-1 activity in human monocytes. Open Cardiovasc Med J 2010; 4:181-8. [PMID: 21160910 PMCID: PMC3002055 DOI: 10.2174/1874192401004010181] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 07/30/2010] [Accepted: 08/02/2010] [Indexed: 12/27/2022] Open
Abstract
Background: Sodium/hydrogen exchanger-1 (NHE-1) contributes to maintaining intracellular pH (pHi). We assessed the effect of glucose, insulin, leptin and adrenaline on NHE-1 activity in human monocytes in vitro. These cells play a role in atherogenesis and disturbances in the hormones evaluated are associated with obesity and diabetes. Methods and Results: Monocytes were isolated from 16 healthy obese and 10 lean healthy subjects. NHE-1 activity was estimated by measuring pHi with a fluorescent dye. pHi was assessed pre- and post-incubation with glucose, insulin, leptin and adrenaline. Experiments were repeated after adding a NHE-1 inhibitor (cariporide) or an inhibitor of protein kinase C (PKC), nitric oxide synthase (NOS), nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, phosphoinositide 3-kinases (PI3K) or actin polymerization. Within the whole study population, glucose enhanced NHE-1 activity by a processes involving PKC, NOS, PI3K and actin polymerization (p = 0.0006 to 0.01). Insulin-mediated activation of NHE-1 (p = <0.0001 to 0.02) required the classical isoforms of PKC, NOS, NADPH oxidase and PI3K. Leptin increased NHE-1 activity (p = 0.0004 to 0.04) through the involvement of PKC and actin polymerization. Adrenaline activated NHE-1 (p = <0.0001 to 0.01) by a process involving the classical isoforms of PKC, NOS and actin polymerization. There were also some differences in responses when lean and obese subjects were compared. Incubation with cariporide attenuated the observed increase in NHE-1 activity. Conclusions: Selective inhibition of NHE-1 in monocytes could become a target for drug action in atherosclerotic vascular disease.
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Affiliation(s)
- Maria Sarigianni
- Metabolic Diseases Unit, Second Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, Greece
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12
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Xu P, Crawford M, Way M, Godovac-Zimmermann J, Segal AW, Radulovic M. Subproteome analysis of the neutrophil cytoskeleton. Proteomics 2009; 9:2037-49. [PMID: 19294702 PMCID: PMC4261606 DOI: 10.1002/pmic.200800674] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Indexed: 11/07/2022]
Abstract
Neutrophils play a key role in the early host-defense mechanisms due to their capacity to migrate into inflamed tissues and phagocytose microorganisms. The cytoskeleton has an essential role in these neutrophil functions, however, its composition is still poorly understood. We separately analyzed different cytoskeletal compartments: cytosolic skeleton, phagosome membrane skeleton, and plasma membrane skeleton. Using a proteomic approach, 138 nonredundant proteins were identified. Proteins not previously known to associate with the skeleton were: n-acetylglucosamine kinase, phosphoglycerate mutase 1, prohibitin, ficolin-1, phosphogluconate dehydrogenase, glucosidase, transketolase, major vault protein, valosin-containing protein, aldehyde dehydrogenase, and lung cancer-related protein-8 (LCRP8). The majority of these proteins can be classified as energy metabolism enzymes. Such a finding was interesting because neutrophil energy metabolism is unusual, mainly relying on glycolysis. The enrichment of phosphoglycerate mutase in cytosolic skeleton was additionally indicated by the use of Western blotting. This is the broadest subcellular investigation to date of the neutrophil cytoskeletal proteome and the first proteomic analysis in any cell type of the phagosome skeleton. The association of metabolic enzymes with cytoskeleton is suggestive of the importance of their localized enrichment and macromolecular organization in neutrophils.
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Affiliation(s)
- Ping Xu
- Centre for Molecular Medicine, Department of Medicine, The Rayne Institute, University College London, London, UK
| | - Mark Crawford
- Centre for Molecular Medicine, Department of Medicine, The Rayne Institute, University College London, London, UK
| | - Michael Way
- Cell Motility Group, Cancer Research UK, Lincoln’s Inn Field Laboratories, London, UK
| | - Jasminka Godovac-Zimmermann
- Centre for Molecular Medicine, Department of Medicine, The Rayne Institute, University College London, London, UK
| | - Anthony W. Segal
- Centre for Molecular Medicine, Department of Medicine, The Rayne Institute, University College London, London, UK
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Upham BL, Trosko JE. Oxidative-dependent integration of signal transduction with intercellular gap junctional communication in the control of gene expression. Antioxid Redox Signal 2009; 11:297-307. [PMID: 18834329 PMCID: PMC2933147 DOI: 10.1089/ars.2008.2146] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Research on oxidative stress focused primarily on determining how reactive oxygen species (ROS) damage cells by indiscriminate reactions with their macromolecular machinery, particularly lipids, proteins, and DNA. However, many chronic diseases are not always a consequence of tissue necrosis, DNA, or protein damage, but rather to altered gene expression. Gene expression is highly regulated by the coordination of cell signaling systems that maintain tissue homeostasis. Therefore, much research has shifted to the understanding of how ROS reversibly control gene expression through cell signaling mechanisms. However, most research has focused on redox regulation of signal transduction within a cell, but we introduce a more comprehensive-systems biology approach to understanding oxidative signaling that includes gap junctional intercellular communication, which plays a role in coordinating gene expression between cells of a tissue needed to maintain tissue homeostasis. We propose a hypothesis that gap junctions are critical in modulating the levels of second messengers, such as low molecular weight reactive oxygen, needed in the transduction of an external signal to the nucleus in the expression of genes. Thus, any comprehensive-systems biology approach to understanding oxidative signaling must also include gap junctions, in which aberrant gap junctions have been clearly implicated in many human diseases.
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Affiliation(s)
- Brad L Upham
- Department of Pediatrics and Human Development, National Food Safety and Toxicology Center, Michigan State University, East Lansing, Michigan 48824, USA.
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14
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Van den Ende W, Valluru R. Sucrose, sucrosyl oligosaccharides, and oxidative stress: scavenging and salvaging? JOURNAL OF EXPERIMENTAL BOTANY 2009; 60:9-18. [PMID: 19036839 DOI: 10.1093/jxb/ern297] [Citation(s) in RCA: 204] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In nature, no single plant completes its life cycle without encountering environmental stress. When plant cells surpass stress threshold stimuli, chemically reactive oxygen species (ROS) are generated that can cause oxidative damage or act as signals. Plants have developed numerous ROS-scavenging systems to minimize the cytotoxic effects of ROS. The role of sucrosyl oligosaccharides (SOS), including fructans and the raffinose family oligosaccharides (RFOs), is well established during stress physiology. They are believed to act as important membrane protectors in planta. So far a putative role for sucrose and SOS during oxidative stress has largely been neglected, as has the contribution of the vacuolar compartment. Recent studies suggest a link between SOS and oxidative defence and/or scavenging. SOS might be involved in stabilizing membrane-associated peroxidases and NADPH oxidases, and SOS-derived radicals might fulfil an intermediate role in oxido-reduction reactions taking place in the vicinity of membranes. Here, these emerging features are discussed and perspectives for future research are provided.
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Affiliation(s)
- Wim Van den Ende
- Laboratory for Molecular Plant Physiology, KU Leuven, Kasteelpark Arenberg 31, B-3001 Leuven, Belgium.
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Hool LC. The L-type Ca(2+) channel as a potential mediator of pathology during alterations in cellular redox state. Heart Lung Circ 2008; 18:3-10. [PMID: 19119068 DOI: 10.1016/j.hlc.2008.11.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The L-type Ca(2+) channel is the main route for calcium influx into cardiac myocytes and an important determinant of calcium homeostasis. There is now considerable evidence that the function of the L-type Ca(2+) channel is influenced by the cell's redox state. Reactive oxygen species such as hydrogen peroxide and superoxide can regulate biological function by directly altering the thiol redox state of proteins. Under conditions where cellular redox state varies, L-type Ca(2+) channel function and diastolic calcium levels can be significantly altered. This article will present the evidence for alterations in L-type Ca(2+) channel function by reactive oxygen species and the potential role for the channel in development of acute electrophysiological instability or chronic pathological remodelling under conditions of persistent oxidative stress.
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Affiliation(s)
- Livia C Hool
- School of Biomedical, Biomolecular and Chemical Sciences and The Western Australian Institute for Medical Research, The University of Western Australia, Crawley, Western Australia, Australia.
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16
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Brambilla D, Mancuso C, Scuderi MR, Bosco P, Cantarella G, Lempereur L, Di Benedetto G, Pezzino S, Bernardini R. The role of antioxidant supplement in immune system, neoplastic, and neurodegenerative disorders: a point of view for an assessment of the risk/benefit profile. Nutr J 2008; 7:29. [PMID: 18826565 PMCID: PMC2572622 DOI: 10.1186/1475-2891-7-29] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Accepted: 09/30/2008] [Indexed: 12/20/2022] Open
Abstract
This review will discuss some issues related to the risk/benefit profile of the use of dietary antioxidants. Thus, recent progress regarding the potential benefit of dietary antioxidants in the treatment of chronic diseases with a special focus on immune system and neurodegenerative disorders will be discussed here. It is well established that reactive oxygen species (ROS) play an important role in the etiology of numerous diseases, such as atherosclerosis, diabetes and cancer. Among the physiological defense system of the cell, the relevance of antioxidant molecules, such as glutathione and vitamins is quite well established. Recently, the interest of researchers has, for example, been conveyed on antioxidant enzyme systems, such as the heme oxygenase/biliverdin reductase system, which appears modulated by dietary antioxidant molecules, including polyphenols and beta-carotene. These systems possibly counteract oxidative damage very efficiently and finally modulate the activity of oxidative phenomena occurring, for instance, during pathophysiological processes. Although evidence shows that antioxidant treatment results in cytoprotection, the potential clinical benefit deriving from both nutritional and supplemental antioxidants is still under wide debate. In this line, the inappropriate assumption of some lipophylic vitamins has been associated with increased incidence of cancer rather than with beneficial effects.
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Affiliation(s)
- Daria Brambilla
- Department of Experimental and Clinical Pharmacology, University of Catania, Catania, Italy.
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17
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Mortimer JC, Laohavisit A, Miedema H, Davies JM. Voltage, reactive oxygen species and the influx of calcium. PLANT SIGNALING & BEHAVIOR 2008; 3:698-9. [PMID: 19704832 PMCID: PMC2634563 DOI: 10.4161/psb.3.9.6405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Accepted: 06/03/2008] [Indexed: 05/20/2023]
Abstract
The apical plasma membrane of young Arabidopsis root hairs has recently been found to contain a depolarisation-activated Ca(2+) channel, in addition to one activated by hyperpolarisation. The depolarisation-activated Ca(2+) channel may function in signalling but the possibility that the root hair apical plasma membrane voltage may oscillate between a hyperpolarized and depolarized state suggests a role in growth control. Plant NADPH oxidase activity has yet to be considered in models of oscillatory voltage or ionic flux despite its predicted electrogenicity and voltage dependence. Activity of root NADPH oxidase was found to be stimulated by restricting Ca(2+) influx, suggesting that these enzymes are involved in sensing Ca(2+) entry into cells.
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Affiliation(s)
- Jennifer C Mortimer
- Department of Plant Sciences; University of Cambridge; Downing Street; Cambridge, United Kingdom
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18
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Miedema H, Demidchik V, Véry AA, Bothwell JHF, Brownlee C, Davies JM. Two voltage-dependent calcium channels co-exist in the apical plasma membrane of Arabidopsis thaliana root hairs. THE NEW PHYTOLOGIST 2008; 179:378-385. [PMID: 19086288 DOI: 10.1111/j.1469-8137.2008.02465.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Calcium (Ca2+)-permeable plasma membrane ion channels are critical to root hair elongation and signalling. Arabidopsis thaliana root hair plasma membrane contains a hyperpolarization-activated Ca2+ channel (HACC) conductance. Here, the co-residence of HACC with a depolarization-activated Ca2+ channel (DACC) conductance has been investigated. Whole-cell patch-clamping of apical plasma membrane has been used to study Ca2+ conductances and reveal the negative slope conductance typical of DACCs. Specific voltage protocols, Ba(2+)-permeation and inhibition by the cation channel blocker Gd3+ have been used to identify the DACC conductance. The Gd3+ sensitive DACC conductance was identified in only a minority of cells. DACC activity was quickly masked by the development of the HACC conductance. However, in the period between the disappearance of the negative slope conductance and the predominance of HACC, DACC activity could still be detected. A DACC conductance coexists with HACC in the root hair apical plasma membrane and could provide Ca2+ influx over a wide voltage range, consistent with a role in signalling.
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Affiliation(s)
- Henk Miedema
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
| | - Vadim Demidchik
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
| | - Anne-Aliénor Véry
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
| | | | - Colin Brownlee
- Marine Biological Association, Citadel Hill, Plymouth PL1 2PB, UK
| | - Julia M Davies
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
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19
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Role of Nox2 in elimination of microorganisms. Semin Immunopathol 2008; 30:237-53. [PMID: 18574584 DOI: 10.1007/s00281-008-0126-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Accepted: 05/23/2008] [Indexed: 12/16/2022]
Abstract
NADPH oxidase of the phagocytic cells (Nox2) transfers electrons from cytosolic NADPH to molecular oxygen in the extracellular or intraphagosomal space. The produced superoxide anion (O*2) provides the source for formation of all toxic oxygen derivatives, but continuous O*2 generation depends on adequate charge compensation. The vital role of Nox2 in efficient elimination of microorganisms is clearly indicated by human pathology as insufficient activity of the enzyme results in severe, recurrent bacterial infections, the typical symptoms of chronic granulomatous disease. The goals of this contribution are to provide critical review of the Nox2-dependent cellular processes that potentially contribute to bacterial killing and degradation and to indicate possible targets of pharmacological interventions.
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20
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Macpherson N, Takeda S, Shang Z, Dark A, Mortimer JC, Brownlee C, Dolan L, Davies JM. NADPH oxidase involvement in cellular integrity. PLANTA 2008; 227:1415-8. [PMID: 18317797 DOI: 10.1007/s00425-008-0716-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Accepted: 02/15/2008] [Indexed: 05/06/2023]
Abstract
NADPH oxidase activity is involved in plant adaptation and development. The reactive oxygen species sourced by NADPH oxidase activity may contribute to wall strength and protoplast volume adjustment. Root hair bulge apices of the NADPH oxidase mutant rhd2/Atrbohc were more robust than the kjk cellulose synthase mutant, but burst more readily than the wild type (WT). Root epidermal wall appeared impaired in rhd2/Atrbohc, as revealed by the number of protoplasts released by wall-degrading enzymes. Root hair bulges of rhd2/Atrbohc burst more than the WT when challenged in situ with hypo-osmotic low ionic strength medium. Inhibition of NADPH oxidase activity with diphenylene iodonium caused WT to phenocopy the rhd2/Atrbohc bursting in response to hypo-osmotic shock. This implicates RHD2/AtRBOHC in softening the cell wall to permit protoplast expansion. Overall, the results point to a role for RHD2/AtRBOHC in contributing to wall strength.
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Affiliation(s)
- Neil Macpherson
- Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK
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