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Ghezzi P, Rubartelli A. Redox regulation of defense against bacterial and viral pathogens. Curr Opin Chem Biol 2023; 76:102339. [PMID: 37295350 DOI: 10.1016/j.cbpa.2023.102339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/10/2023] [Accepted: 05/12/2023] [Indexed: 06/12/2023]
Abstract
There is considerable interest in the role of oxygen-derived oxidants (often termed generically reactive oxygen species), and the potential effect of exogenous antioxidants, in the pathogenesis of infectious disease. Most of the published research focuses on the inflammatory response and the concept that oxidants are pro-inflammatory and antioxidants are anti-inflammatory. The present review discusses the evidence that both oxidants and thiol antioxidants are important in the various processes of innate and adaptive immunity, focusing on the function of the immune system in the defense against pathogens, rather than its pathogenic role in inflammatory and autoimmune disease.
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Affiliation(s)
- Pietro Ghezzi
- Department of Biomolecular Sciences, Università di Urbino, 61029, Urbino, Italy.
| | - Anna Rubartelli
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, 20100, Milano, Italy
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Mullen L, Mengozzi M, Hanschmann EM, Alberts B, Ghezzi P. How the redox state regulates immunity. Free Radic Biol Med 2020; 157:3-14. [PMID: 31899344 DOI: 10.1016/j.freeradbiomed.2019.12.022] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 12/05/2019] [Accepted: 12/19/2019] [Indexed: 12/30/2022]
Abstract
Oxidative stress is defined as an imbalance between the levels of reactive oxygen species (ROS) and antioxidant defences. The view of oxidative stress as a cause of cell damage has evolved over the past few decades to a much more nuanced view of the role of oxidative changes in cell physiology. This is no more evident than in the field of immunity, where oxidative changes are now known to regulate many aspects of the immune response, and inflammatory pathways in particular. Our understanding of redox regulation of immunity now encompasses not only increases in reactive oxygen and nitrogen species, but also changes in the activities of oxidoreductase enzymes. These enzymes are important regulators of immune pathways both via changes in their redox activity, but also via other more recently identified cytokine-like functions. The emerging picture of redox regulation of immune pathways is one of increasing complexity and while therapeutic targeting of the redox environment to treat inflammatory disease is a possibility, any such strategy is likely to be more nuanced than simply inhibiting ROS production.
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Affiliation(s)
- Lisa Mullen
- Brighton and Sussex Medical School, Falmer, Brighton, UK
| | | | - Eva-Maria Hanschmann
- Department of Neurology, Medical Faculty, Heinrich-Heine University Düsseldorf, Germany
| | - Ben Alberts
- Brighton and Sussex Medical School, Falmer, Brighton, UK
| | - Pietro Ghezzi
- Brighton and Sussex Medical School, Falmer, Brighton, UK.
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Cell Signaling with Extracellular Thioredoxin and Thioredoxin-Like Proteins: Insight into Their Mechanisms of Action. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:8475125. [PMID: 29138681 PMCID: PMC5613632 DOI: 10.1155/2017/8475125] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/06/2017] [Accepted: 07/17/2017] [Indexed: 12/17/2022]
Abstract
Thioredoxins are small thiol-oxidoreductase enzymes that control cellular redox homeostasis. Paradoxically, human thioredoxin (TXN1) was first identified as the adult T cell leukemia-derived factor (ADF), a secreted protein. ADF has been implicated in a wide variety of cell-to-cell communication systems acting as a cytokine or a chemokine. TRX80 is a truncated TXN1 protein with cytokine activity. The unconventional secretion mechanism of these extracellular thioredoxins is unknown. The thioredoxin system is relying on glucose metabolism through the pentose phosphate pathway that provides reducing power in the form of NADPH, the cofactor of thioredoxin reductase (TXNRD). While a complete extracellular TXN system is present in the blood in the form of circulating TXN1 and TXNDR1, the source of extracellular NADPH remains a mystery. In the absence of redox regenerating capacity, extracellular thioredoxins may rather be prooxidant agents. Rod-derived cone viability factor (RdCVF) is the product of intron retention of the nucleoredoxin-like 1 (NXNL1) gene, a secreted truncated thioredoxin-like protein. The other product encoded by the gene, RdCVFL, is an enzymatically active thioredoxin. This is a very singular example of positive feedback of a superthioredoxin system encoded by a single gene likely emerging during evolution from metabolic constraints on redox signaling.
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Abstract
SIGNIFICANCE Secreted proteins are important both as signaling molecules and potential biomarkers. Recent Advances: Protein can undergo different types of oxidation, both in physiological conditions or under oxidative stress. Several redox proteomics techniques have been successfully applied to the identification of glutathionylated proteins, an oxidative post-translational modification consisting in the formation of a mixed disulfide between a protein cysteine and glutathione. Redox proteomics has also been used to study other forms of protein oxidation. CRITICAL ISSUES Because of the highest proportion of free cysteines in the cytosol, redox proteomics of protein thiols has focused, so far, on intracellular proteins. However, plasma proteins, such as transthyretin and albumin, have been described as glutathionylated or cysteinylated. The present review discusses the redox state of protein cysteines in relation to their cellular distribution. We describe the various approaches used to detect secreted glutathionylated proteins, the only thiol modification studied so far in secreted proteins, and the specific problems presented in the study of the secretome. FUTURE DIRECTIONS This review focusses on glutathionylated proteins secreted under inflammatory conditions and that may act as soluble mediators (cytokines). Future studies on the redox secretome (including other forms of oxidation) might identify new soluble mediators and biomarkers of oxidative stress. Antioxid. Redox Signal. 26, 299-312.
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Affiliation(s)
- Pietro Ghezzi
- 1 Brighton & Sussex Medical School , Brighton, United Kingdom
| | - Philippe Chan
- 2 PISSARO Proteomic Platform, Institute for Research and Innovation in Biomedicine, University of Rouen , Rouen, France
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Frijhoff J, Winyard PG, Zarkovic N, Davies SS, Stocker R, Cheng D, Knight AR, Taylor EL, Oettrich J, Ruskovska T, Gasparovic AC, Cuadrado A, Weber D, Poulsen HE, Grune T, Schmidt HHHW, Ghezzi P. Clinical Relevance of Biomarkers of Oxidative Stress. Antioxid Redox Signal 2015; 23:1144-70. [PMID: 26415143 PMCID: PMC4657513 DOI: 10.1089/ars.2015.6317] [Citation(s) in RCA: 515] [Impact Index Per Article: 57.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
SIGNIFICANCE Oxidative stress is considered to be an important component of various diseases. A vast number of methods have been developed and used in virtually all diseases to measure the extent and nature of oxidative stress, ranging from oxidation of DNA to proteins, lipids, and free amino acids. RECENT ADVANCES An increased understanding of the biology behind diseases and redox biology has led to more specific and sensitive tools to measure oxidative stress markers, which are very diverse and sometimes very low in abundance. CRITICAL ISSUES The literature is very heterogeneous. It is often difficult to draw general conclusions on the significance of oxidative stress biomarkers, as only in a limited proportion of diseases have a range of different biomarkers been used, and different biomarkers have been used to study different diseases. In addition, biomarkers are often measured using nonspecific methods, while specific methodologies are often too sophisticated or laborious for routine clinical use. FUTURE DIRECTIONS Several markers of oxidative stress still represent a viable biomarker opportunity for clinical use. However, positive findings with currently used biomarkers still need to be validated in larger sample sizes and compared with current clinical standards to establish them as clinical diagnostics. It is important to realize that oxidative stress is a nuanced phenomenon that is difficult to characterize, and one biomarker is not necessarily better than others. The vast diversity in oxidative stress between diseases and conditions has to be taken into account when selecting the most appropriate biomarker.
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Affiliation(s)
- Jeroen Frijhoff
- 1 Faculty of Health, Medicine and Life Sciences, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Paul G Winyard
- 2 University of Exeter Medical School , Exeter, United Kingdom
| | | | - Sean S Davies
- 4 Department of Medicine, Vanderbilt University , Nashville, Tennessee.,5 Division of Clinical Pharmacology, Department of Pharmacology, Vanderbilt University , Nashville, Tennessee
| | - Roland Stocker
- 6 Vascular Biology Division, Victor Chang Cardiac Research Institute , Darlinghurst, New South Wales, Australia .,7 School of Medical Sciences, University of New South Wales , Sydney, New South Wales, Australia
| | - David Cheng
- 6 Vascular Biology Division, Victor Chang Cardiac Research Institute , Darlinghurst, New South Wales, Australia
| | - Annie R Knight
- 2 University of Exeter Medical School , Exeter, United Kingdom
| | | | - Jeannette Oettrich
- 1 Faculty of Health, Medicine and Life Sciences, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Tatjana Ruskovska
- 8 Faculty of Medical Sciences, Goce Delcev University , Stip, Macedonia
| | | | - Antonio Cuadrado
- 9 Centro de Investigación Biomedica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , ISCIII, Madrid, Spain .,10 Instituto de Investigaciones Biomedicas "Alberto Sols" UAM-CSIC , Madrid, Spain .,11 Instituto de Investigacion Sanitaria La Paz (IdiPaz) , Madrid, Spain .,12 Department of Biochemistry, Faculty of Medicine, Autonomous University of Madrid , Madrid, Spain
| | - Daniela Weber
- 13 Department of Molecular Toxicology, German Institute of Human Nutrition (DIfE) , Nuthetal, Germany
| | - Henrik Enghusen Poulsen
- 14 Faculty of Health Science, University of Copenhagen , Copenhagen, Denmark .,15 Bispebjerg-Frederiksberg Hospital , Copenhagen, Denmark
| | - Tilman Grune
- 13 Department of Molecular Toxicology, German Institute of Human Nutrition (DIfE) , Nuthetal, Germany
| | - Harald H H W Schmidt
- 1 Faculty of Health, Medicine and Life Sciences, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University , Maastricht, the Netherlands
| | - Pietro Ghezzi
- 16 Brighton and Sussex Medical School , Brighton, United Kingdom
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Viral Source-Independent High Susceptibility of Dendritic Cells to Human T-Cell Leukemia Virus Type 1 Infection Compared to That of T Lymphocytes. J Virol 2015; 89:10580-90. [PMID: 26269171 DOI: 10.1128/jvi.01799-15] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 08/03/2015] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Human T-cell leukemia virus type 1 (HTLV-1)-infected CD4(+) T cells and dendritic cells (DCs) are present in peripheral blood from HTLV-1 carriers. While T-cell infection requires cell-cell contact, DCs might be infected with cell-free virus, at least in vitro. However, a thorough comparison of the susceptibilities of the two cell types to HTLV-1 infection using cell-associated and cell-free viral sources has not been performed. We first determined that human primary monocyte-derived dendritic cells (MDDCs) were more susceptible to HTLV-1 infection than their autologous lymphocyte counterparts after contact with chronically infected cells. Next, a comparison of infection efficiency using nonconcentrated or concentrated supernatants from infected cells as well as purified viral biofilm was performed. Integrated provirus was found after exposure of MDDCs or primary lymphocytes to viral biofilm but not to a viral supernatant. Using a large series of primary cell samples (n = 21), we demonstrated a higher proviral load in MDDCs exposed to viral biofilm than in lymphocytes. This higher susceptibility is correlated to a higher expression of neuropilin-1 on MDDCs than on autologous activated T lymphocytes. Moreover, we show that MDDCs infected with viral biofilm can transmit the virus to lymphocytes. In conclusion, MDDCs are more susceptible to HTLV-1 infection than autologous lymphocytes in vitro, supporting a model in which DC infection might represent an important step during primo-infection in vivo. IMPORTANCE HTLV-1 is able to infect several cell types, but viral DNA is mainly found in T lymphocytes in vivo. This supports a model in which T lymphocytes are the main target of infection. However, during the primo-infection of new individuals, incoming viruses might first encounter dendritic cells (DCs), the specialized immune cells responsible for the antiviral response of the host. HTLV-1 cell-free purified viruses can infect dendritic cells in vitro, while T-cell infection is restricted to cell-to-cell transmission. In order to understand the sequence of HTLV-1 dissemination, we undertook a direct comparison of the susceptibilities of the two cell types using cell-associated and cell-free viral sources. We report here that MDDCs are more susceptible to HTLV-1 infection than autologous lymphocytes in vitro and are able to efficiently transmit the virus to lymphocytes. Our results suggest that DCs may represent a true viral reservoir, as the first cell type to be infected in vivo.
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