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Peptidyl-prolyl cis-trans isomerase A participates in the selenium transport into the rat brain. J Biol Inorg Chem 2021; 26:933-945. [PMID: 34550449 DOI: 10.1007/s00775-021-01903-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 09/08/2021] [Indexed: 10/20/2022]
Abstract
Selenium, an essential micronutrient, plays vital roles in the brain. Selenoprotein P (SELENOP), a major plasma selenoprotein, is thought to transport selenium to the brain. However, Selenop-knockout mice fed a diet containing an adequate amount of selenium shows no objective neurological dysfunction which is observed in the selenium-deficient diet-fed Selenop-knockout mice. This fact indicated that selenium from low-mass selenium-source compounds can be transported by SELENOP-independent alternative pathways to the brain. In this study, to obtain the basic information about the SELENOP-independent transport pathways, we performed ex vivo experiments in which the rat brain cell membrane fraction was analyzed to find selenium-binding and/or -interactive proteins using its reactive metabolic intermediate, selenotrisulfide (STS), and MALDI TOF-mass spectrometry. Several membrane proteins with the cysteine (C) thiol were found to be reactive with STS through the thiol-exchange reaction. One of the C-containing proteins in the brain cell membrane fraction was identified as peptidyl-prolyl cis-trans isomerase (PPIase) A from tryptic fragmentation experiments and database search. Among the 4 C residues in rat PPIase A, 21st C was proved to react with STS by assessment using C mutated recombinant proteins. PPIase A is ubiquitously expressed and also associates with a variety of biologically important events such as immunomodulation, intracellular signaling, transcriptional regulation and protein trafficking. Consequently, PPIase A was thought to participate in the selenium transport into the rat brain.
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Ashby LV, Springer R, Hampton MB, Kettle AJ, Winterbourn CC. Evaluating the bactericidal action of hypochlorous acid in culture media. Free Radic Biol Med 2020; 159:119-124. [PMID: 32739594 DOI: 10.1016/j.freeradbiomed.2020.07.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/23/2020] [Accepted: 07/27/2020] [Indexed: 01/04/2023]
Abstract
The bactericidal activity of the physiological oxidant hypochlorous acid (HOCl) is commonly studied in a variety of laboratory media. Reactive with numerous targets, HOCl will rapidly lose its toxicity via reduction or be converted to chloramines and other less toxic species. The objective of this study was to test the influence of various media, temperature and reaction time on the toxicity of HOCl. After incubating bacteria in media dosed with reagent HOCl, the bactericidal outcome was measured by colony forming ability. In parallel, we determined the HOCl and chloramine content after dosing media alone. Our results showed that more reagent HOCl was required to kill bacteria in culture media than in aqueous buffer, and this corresponded to the lower concentration of reactive chlorine species achieved in the media. RPMI and MOPS minimal medium retained significant oxidising equivalents after HOCl-dosing, but more nutrient-rich media such as MEM, DMEM, LB and TSB, had higher scavenging capacity. Other factors that lowered the bactericidal strength of HOCl were longer lag-times and raised temperature when pre-dosing media, and insufficient incubation time of cells with the HOCl-treated media. In summary, we demonstrate that the choice of media as well as procedural details within experiments crucially impact the cellular toxicity of HOCl. These factors influence the nature and concentration of oxidants generated, and therefore are critical in affecting cellular responses.
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Affiliation(s)
- Louisa V Ashby
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand.
| | - Reuben Springer
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Mark B Hampton
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Anthony J Kettle
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Christine C Winterbourn
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
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3
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Myeloperoxidase: A versatile mediator of endothelial dysfunction and therapeutic target during cardiovascular disease. Pharmacol Ther 2020; 221:107711. [PMID: 33137376 DOI: 10.1016/j.pharmthera.2020.107711] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 10/01/2020] [Indexed: 02/06/2023]
Abstract
Myeloperoxidase (MPO) is a prominent mammalian heme peroxidase and a fundamental component of the innate immune response against microbial pathogens. In recent times, MPO has received considerable attention as a key oxidative enzyme capable of impairing the bioactivity of nitric oxide (NO) and promoting endothelial dysfunction; a clinically relevant event that manifests throughout the development of inflammatory cardiovascular disease. Increasing evidence indicates that during cardiovascular disease, MPO is released intravascularly by activated leukocytes resulting in its transport and sequestration within the vascular endothelium. At this site, MPO catalyzes various oxidative reactions that are capable of promoting vascular inflammation and impairing NO bioactivity and endothelial function. In particular, MPO catalyzes the production of the potent oxidant hypochlorous acid (HOCl) and the catalytic consumption of NO via the enzyme's NO oxidase activity. An emerging paradigm is the ability of MPO to also influence endothelial function via non-catalytic, cytokine-like activities. In this review article we discuss the implications of our increasing knowledge of the versatility of MPO's actions as a mediator of cardiovascular disease and endothelial dysfunction for the development of new pharmacological agents capable of effectively combating MPO's pathogenic activities. More specifically, we will (i) discuss the various transport mechanisms by which MPO accumulates into the endothelium of inflamed or diseased arteries, (ii) detail the clinical and basic scientific evidence identifying MPO as a significant cause of endothelial dysfunction and cardiovascular disease, (iii) provide an up-to-date coverage on the different oxidative mechanisms by which MPO can impair endothelial function during cardiovascular disease including an evaluation of the contributions of MPO-catalyzed HOCl production and NO oxidation, and (iv) outline the novel non-enzymatic mechanisms of MPO and their potential contribution to endothelial dysfunction. Finally, we deliver a detailed appraisal of the different pharmacological strategies available for targeting the catalytic and non-catalytic modes-of-action of MPO in order to protect against endothelial dysfunction in cardiovascular disease.
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Zhuang H, Li Q, Zhang X, Ma X, Wang Z, Liu Y, Yi X, Chen R, Han F, Zhang N, Li Y. Downregulation of glycine decarboxylase enhanced cofilin-mediated migration in hepatocellular carcinoma cells. Free Radic Biol Med 2018. [PMID: 29524606 DOI: 10.1016/j.freeradbiomed.2018.03.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Metabolic reprogramming is a hallmark of cancer. Glycine decarboxylase (GLDC), an oxidoreductase, plays an important role in amino acid metabolism. While GLDC promotes tumor initiation and proliferation in non-small cell lung cancer and glioma and it was reported as a putative tumor suppressor gene in gastric cancer, the role of GLDC in hepatocellular carcinoma (HCC) is unknown. In the current study, microarray-based analysis suggested that GLDC expression was low in highly malignant HCC cell lines, and clinicopathological analysis revealed a decrease in GLDC in HCC tumor samples. While the knockdown of GLDC enhanced cancer cell migration and invasion, GLDC overexpression inhibited them. Mechanistic studies revealed that GLDC knockdown increased the levels of reactive oxygen species (ROS) and decreased the ratio of glutathione/oxidized glutathione (GSH/GSSG), which in turn dampened the ubiquitination of cofilin, a key regulator of actin polymerization. Consequently, the protein level of cofilin was elevated, which accounted for the increase in cell migration. The overexpression of GLDC reversed the phenotype. Treatment with N-acetyl-L-cysteine decreased the protein level of cofilin while treatment with H2O2 increased it, further confirming the role of ROS in regulating cofilin degradation. In a tumor xenographic transplant nude mouse model, the knockdown of GLDC promoted intrahepatic metastasis of HCC while GLDC overexpression inhibited it. Our data indicate that GLDC downregulation decreases ROS-mediated ubiquitination of cofilin to enhance HCC progression and intrahepatic metastasis.
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Affiliation(s)
- Hao Zhuang
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China; Department of Hepatic Biliary Pancreatic Surgery, Cancer Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan Province 450000, China; Department of Hepatobiliary Surgery, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300070, China
| | - Qiang Li
- Department of Hepatobiliary Surgery, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300070, China
| | - Xinran Zhang
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Xuda Ma
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Zun Wang
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Yun Liu
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Xianfu Yi
- School of Biomedical Engineering, Tianjin Medical University, Tianjin 300070, China
| | - Ruibing Chen
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Feng Han
- Department of Hepatic Biliary Pancreatic Surgery, Cancer Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan Province 450000, China
| | - Ning Zhang
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China.
| | - Yongmei Li
- Key Laboratory of Breast Cancer Prevention and Therapy, Laboratory of Cancer Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Department of Pathogen Biology & Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China.
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Giustarini D, Colombo G, Garavaglia ML, Astori E, Portinaro NM, Reggiani F, Badalamenti S, Aloisi AM, Santucci A, Rossi R, Milzani A, Dalle-Donne I. Assessment of glutathione/glutathione disulphide ratio and S-glutathionylated proteins in human blood, solid tissues, and cultured cells. Free Radic Biol Med 2017; 112:360-375. [PMID: 28807817 DOI: 10.1016/j.freeradbiomed.2017.08.008] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 08/04/2017] [Accepted: 08/09/2017] [Indexed: 12/24/2022]
Abstract
Glutathione (GSH) is the major non-protein thiol in humans and other mammals, which is present in millimolar concentrations within cells, but at much lower concentrations in the blood plasma. GSH and GSH-related enzymes act both to prevent oxidative damage and to detoxify electrophiles. Under oxidative stress, two GSH molecules become linked by a disulphide bridge to form glutathione disulphide (GSSG). Therefore, assessment of the GSH/GSSG ratio may provide an estimation of cellular redox metabolism. Current evidence resulting from studies in human blood, solid tissues, and cultured cells suggests that GSH also plays a prominent role in protein redox regulation via S -glutathionylation, i.e., the conjugation of GSH to reactive protein cysteine residues. A number of methodologies that enable quantitative analysis of GSH/GSSG ratio and S-glutathionylated proteins (PSSG), as well as identification and visualization of PSSG in tissue sections or cultured cells are currently available. Here, we have considered the main methodologies applied for GSH, GSSG and PSSG detection in biological samples. This review paper provides an up-to-date critical overview of the application of the most relevant analytical, morphological, and proteomics approaches to detect and analyse GSH, GSSG and PSSG in mammalian samples as well as discusses their current limitations.
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Affiliation(s)
- Daniela Giustarini
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Graziano Colombo
- Department of Biosciences, Università degli Studi di Milano, 20133 Milan, Italy
| | | | - Emanuela Astori
- Department of Biosciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Nicola Marcello Portinaro
- Clinica ortopedica e traumatologica, Humanitas Clinical and Research Center, 20089 Rozzano, Milan, Italy
| | - Francesco Reggiani
- Nephrology and Dialysis Unit, Humanitas Clinical and Research Center, 20089 Rozzano, Milan, Italy
| | - Salvatore Badalamenti
- Nephrology and Dialysis Unit, Humanitas Clinical and Research Center, 20089 Rozzano, Milan, Italy
| | - Anna Maria Aloisi
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Annalisa Santucci
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy
| | - Ranieri Rossi
- Department of Life Sciences, University of Siena, 53100 Siena, Italy
| | - Aldo Milzani
- Department of Biosciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Isabella Dalle-Donne
- Department of Biosciences, Università degli Studi di Milano, 20133 Milan, Italy.
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Ulrich K, Finkenzeller C, Merker S, Rojas F, Matthews K, Ruppert T, Krauth-Siegel RL. Stress-Induced Protein S-Glutathionylation and S-Trypanothionylation in African Trypanosomes-A Quantitative Redox Proteome and Thiol Analysis. Antioxid Redox Signal 2017; 27:517-533. [PMID: 28338335 PMCID: PMC5567454 DOI: 10.1089/ars.2016.6947] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
AIMS Trypanosomatids have a unique trypanothione-based thiol redox metabolism. The parasite-specific dithiol is synthesized from glutathione and spermidine, with glutathionylspermidine as intermediate catalyzed by trypanothione synthetase. In this study, we address the oxidative stress response of African trypanosomes with special focus on putative protein S-thiolation. RESULTS Challenging bloodstream Trypanosoma brucei with diamide, H2O2 or hypochlorite results in distinct levels of reversible overall protein S-thiolation. Quantitative proteome analyses reveal 84 proteins oxidized in diamide-stressed parasites. Fourteen of them, including several essential thiol redox proteins and chaperones, are also enriched when glutathione/glutaredoxin serves as a reducing system indicating S-thiolation. In parasites exposed to H2O2, other sets of proteins are modified. Only three proteins are S-thiolated under all stress conditions studied in accordance with a highly specific response. H2O2 causes primarily the formation of free disulfides. In contrast, in diamide-treated cells, glutathione, glutathionylspermidine, and trypanothione are almost completely protein bound. Remarkably, the total level of trypanothione is decreased, whereas those of glutathione and glutathionylspermidine are increased, indicating partial hydrolysis of protein-bound trypanothione. Depletion of trypanothione synthetase exclusively induces protein S-glutathionylation. Total mass analyses of a recombinant peroxidase treated with T(SH)2 and either diamide or hydrogen peroxide verify protein S-trypanothionylation as stable modification. INNOVATION Our data reveal for the first time that trypanosomes employ protein S-thiolation when exposed to exogenous and endogenous oxidative stresses and trypanothione, despite its dithiol character, forms protein-mixed disulfides. CONCLUSION The stress-specific responses shown here emphasize protein S-trypanothionylation and S-glutathionylation as reversible protection mechanism in these parasites. Antioxid. Redox Signal. 27, 517-533.
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Affiliation(s)
- Kathrin Ulrich
- 1 Biochemie-Zentrum der Universität Heidelberg (BZH) , Heidelberg, Germany
| | | | - Sabine Merker
- 2 Zentrum für Molekularbiologie der Universität Heidelberg (ZMBH) , Heidelberg, Germany
| | - Federico Rojas
- 3 Centre for Immunity, Infection and Evolution, Institute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh , Edinburgh, United Kingdom
| | - Keith Matthews
- 3 Centre for Immunity, Infection and Evolution, Institute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh , Edinburgh, United Kingdom
| | - Thomas Ruppert
- 2 Zentrum für Molekularbiologie der Universität Heidelberg (ZMBH) , Heidelberg, Germany
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7
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Liu Z, Liu Y, Xu Q, Peng H, Tang Y, Yang T, Yu Z, Cheng G, Zhang G, Shi R. Critical role of vascular peroxidase 1 in regulating endothelial nitric oxide synthase. Redox Biol 2017; 12:226-232. [PMID: 28264790 PMCID: PMC5338721 DOI: 10.1016/j.redox.2017.02.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 02/26/2017] [Indexed: 12/19/2022] Open
Abstract
Vascular peroxidase 1 (VPO1) is a member of the peroxidase family which aggravates oxidative stress by producing hypochlorous acid (HOCl). Our previous study demonstrated that VPO1 plays a critical role in endothelial dysfunction through dimethylarginine dimethylaminohydrolase2 (DDAH2)/asymmetric Dimethylarginine (ADMA) pathway. Hereby we describe the regulatory role of VPO1 on endothelial nitric oxide synthase (eNOS) expression and activity in human umbilical vein endothelial cells (HUVECs). In HUVECs AngiotensinII (100 nM) treatment reduced Nitric Oxide (NO) production, decreased eNOS expression and activity, which were reversed by VPO1 siRNA. Knockdown of VPO1 also attenuated ADMA production and eNOS uncoupling while enhancing phosphorylated ser1177 eNOS expression level. Furthermore, HOCl stimulation was shown to directly induce ADMA production and eNOS uncoupling, decrease phosphorylated ser1177 eNOS expression. It also significantly suppressed eNOS expression and activity together with NO production. Therefore, VPO1 plays a vital role in regulating eNOS expression and activity via hydrogen peroxide (H2O2)-VPO1-HOCl pathway. Angiotensin II decreased eNOS expression and activity in HUVECs. VPO1 plays an important role in regulating eNOS expression and activity in HUVECs. VPO1 regulates eNOS expression and activity through VPO1/H2O2/HOCl pathway.
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Affiliation(s)
- Zhaoya Liu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yanbo Liu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Qian Xu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Haiyang Peng
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yixin Tang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Tianlun Yang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Zaixin Yu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Guangjie Cheng
- Division of Pulmonary, Allergy & Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Guogang Zhang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China.
| | - Ruizheng Shi
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China.
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8
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Short JD, Downs K, Tavakoli S, Asmis R. Protein Thiol Redox Signaling in Monocytes and Macrophages. Antioxid Redox Signal 2016; 25:816-835. [PMID: 27288099 PMCID: PMC5107717 DOI: 10.1089/ars.2016.6697] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
SIGNIFICANCE Monocyte and macrophage dysfunction plays a critical role in a wide range of inflammatory disease processes, including obesity, impaired wound healing diabetic complications, and atherosclerosis. Emerging evidence suggests that the earliest events in monocyte or macrophage dysregulation include elevated reactive oxygen species production, thiol modifications, and disruption of redox-sensitive signaling pathways. This review focuses on the current state of research in thiol redox signaling in monocytes and macrophages, including (i) the molecular mechanisms by which reversible protein-S-glutathionylation occurs, (ii) the identification of bona fide S-glutathionylated proteins that occur under physiological conditions, and (iii) how disruptions of thiol redox signaling affect monocyte and macrophage functions and contribute to atherosclerosis. Recent Advances: Recent advances in redox biochemistry and biology as well as redox proteomic techniques have led to the identification of many new thiol redox-regulated proteins and pathways. In addition, major advances have been made in expanding the list of S-glutathionylated proteins and assessing the role that protein-S-glutathionylation and S-glutathionylation-regulating enzymes play in monocyte and macrophage functions, including monocyte transmigration, macrophage polarization, foam cell formation, and macrophage cell death. CRITICAL ISSUES Protein-S-glutathionylation/deglutathionylation in monocytes and macrophages has emerged as a new and important signaling paradigm, which provides a molecular basis for the well-established relationship between metabolic disorders, oxidative stress, and cardiovascular diseases. FUTURE DIRECTIONS The identification of specific S-glutathionylated proteins as well as the mechanisms that control this post-translational protein modification in monocytes and macrophages will facilitate the development of new preventive and therapeutic strategies to combat atherosclerosis and other metabolic diseases. Antioxid. Redox Signal. 25, 816-835.
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Affiliation(s)
- John D Short
- 1 Department of Pharmacology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Kevin Downs
- 2 Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Sina Tavakoli
- 3 Department of Radiology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Reto Asmis
- 4 Department of Clinical Laboratory Sciences, University of Texas Health Science Center at San Antonio , San Antonio, Texas.,5 Department of Biochemistry, University of Texas Health Science Center at San Antonio , San Antonio, Texas
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Folda A, Citta A, Scalcon V, Calì T, Zonta F, Scutari G, Bindoli A, Rigobello MP. Mitochondrial Thioredoxin System as a Modulator of Cyclophilin D Redox State. Sci Rep 2016; 6:23071. [PMID: 26975474 PMCID: PMC4791683 DOI: 10.1038/srep23071] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 02/25/2016] [Indexed: 01/25/2023] Open
Abstract
The mitochondrial thioredoxin system (NADPH, thioredoxin reductase, thioredoxin) is a major redox regulator. Here we have investigated the redox correlation between this system and the mitochondrial enzyme cyclophilin D. The peptidyl prolyl cis-trans isomerase activity of cyclophilin D was stimulated by the thioredoxin system, while it was decreased by cyclosporin A and the thioredoxin reductase inhibitor auranofin. The redox state of cyclophilin D, thioredoxin 1 and 2 and peroxiredoxin 3 was measured in isolated rat heart mitochondria and in tumor cell lines (CEM-R and HeLa) by redox Western blot analysis upon inhibition of thioredoxin reductase with auranofin, arsenic trioxide, 1-chloro-2,4-dinitrobenzene or after treatment with hydrogen peroxide. A concomitant oxidation of thioredoxin, peroxiredoxin and cyclophilin D was observed, suggesting a redox communication between the thioredoxin system and cyclophilin. This correlation was further confirmed by i) co-immunoprecipitation assay of cyclophilin D with thioredoxin 2 and peroxiredoxin 3, ii) molecular modeling and iii) depleting thioredoxin reductase by siRNA. We conclude that the mitochondrial thioredoxin system controls the redox state of cyclophilin D which, in turn, may act as a regulator of several processes including ROS production and pro-apoptotic factors release.
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Affiliation(s)
- Alessandra Folda
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/b, 35131 Padova, Italy
| | - Anna Citta
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/b, 35131 Padova, Italy
| | - Valeria Scalcon
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/b, 35131 Padova, Italy
| | - Tito Calì
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/b, 35131 Padova, Italy
| | - Francesco Zonta
- Shangai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, No. 99 Haike Road, Pudong, Shanghai 201210, China
| | - Guido Scutari
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/b, 35131 Padova, Italy
| | - Alberto Bindoli
- Institute of Neuroscience (CNR), viale G. Colombo 3, 35131 Padova, Italy
| | - Maria Pia Rigobello
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/b, 35131 Padova, Italy
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10
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Trujillo M, Alvarez B, Radi R. One- and two-electron oxidation of thiols: mechanisms, kinetics and biological fates. Free Radic Res 2015; 50:150-71. [PMID: 26329537 DOI: 10.3109/10715762.2015.1089988] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The oxidation of biothiols participates not only in the defense against oxidative damage but also in enzymatic catalytic mechanisms and signal transduction processes. Thiols are versatile reductants that react with oxidizing species by one- and two-electron mechanisms, leading to thiyl radicals and sulfenic acids, respectively. These intermediates, depending on the conditions, participate in further reactions that converge on different stable products. Through this review, we will describe the biologically relevant species that are able to perform these oxidations and we will analyze the mechanisms and kinetics of the one- and two-electron reactions. The processes undergone by typical low-molecular-weight thiols as well as the particularities of specific thiol proteins will be described, including the molecular determinants proposed to account for the extraordinary reactivities of peroxidatic thiols. Finally, the main fates of the thiyl radical and sulfenic acid intermediates will be summarized.
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Affiliation(s)
- Madia Trujillo
- a Departamento de Bioquímica , Facultad de Medicina, Universidad de la República , Montevideo , Uruguay .,b Center for Free Radical and Biomedical Research , Universidad de la República , Montevideo , Uruguay , and
| | - Beatriz Alvarez
- b Center for Free Radical and Biomedical Research , Universidad de la República , Montevideo , Uruguay , and.,c Laboratorio de Enzimología, Facultad de Ciencias , Universidad de la República , Montevideo , Uruguay
| | - Rafael Radi
- a Departamento de Bioquímica , Facultad de Medicina, Universidad de la República , Montevideo , Uruguay .,b Center for Free Radical and Biomedical Research , Universidad de la República , Montevideo , Uruguay , and
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11
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Galajda M, Fodor T, Purgel M, Fábián I. The kinetics and mechanism of the oxidation of pyruvate ion by hypochlorous acid. RSC Adv 2015. [DOI: 10.1039/c4ra12789g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Kinetic experiments and DFT calculations confirm a concerted oxygen atom transfer mechanism for the oxidation of pyruvic acid by HOCl.
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Affiliation(s)
- Mónika Galajda
- MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group
- Debrecen
- Hungary
| | - Tímea Fodor
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Mihály Purgel
- MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group
- Debrecen
- Hungary
| | - István Fábián
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
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Mermelekas G, Makridakis M, Koeck T, Vlahou A. Redox proteomics: from residue modifications to putative biomarker identification by gel- and LC-MS-based approaches. Expert Rev Proteomics 2014; 10:537-49. [DOI: 10.1586/14789450.2013.855611] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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