201
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Petrillo S, Piermarini E, Pastore A, Vasco G, Schirinzi T, Carrozzo R, Bertini E, Piemonte F. Nrf2-Inducers Counteract Neurodegeneration in Frataxin-Silenced Motor Neurons: Disclosing New Therapeutic Targets for Friedreich's Ataxia. Int J Mol Sci 2017; 18:E2173. [PMID: 29057804 PMCID: PMC5666854 DOI: 10.3390/ijms18102173] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 10/09/2017] [Accepted: 10/14/2017] [Indexed: 12/28/2022] Open
Abstract
Oxidative stress is actively involved in Friedreich's Ataxia (FA), thus pharmacological targeting of the antioxidant machinery may have therapeutic value. Here, we analyzed the relevance of the antioxidant phase II response mediated by the transcription factor Nrf2 on frataxin-deficient cultured motor neurons and on fibroblasts of patients. The in vitro treatment of the potent Nrf2 activator sulforaphane increased Nrf2 protein levels and led to the upregulation of phase II antioxidant enzymes. The neuroprotective effects were accompanied by an increase in neurites' number and extension. Sulforaphane (SFN) is a natural compound of many diets and is now being used in clinical trials for other pathologies. Our results provide morphological and biochemical evidence to endorse a neuroprotective strategy that may have therapeutic relevance for FA. The findings of this work reinforce the crucial importance of Nrf2 in FA and provide a rationale for using Nrf2-inducers as pharmacological agents.
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Affiliation(s)
- Sara Petrillo
- Unit of Neuromuscular and Neurodegenerative Diseases, IRCCS Bambino Gesù Children's Hospital, Viale San Paolo 15, 00146 Rome, Italy.
| | - Emanuela Piermarini
- Unit of Neuromuscular and Neurodegenerative Diseases, IRCCS Bambino Gesù Children's Hospital, Viale San Paolo 15, 00146 Rome, Italy.
- Drexel University College of Medicine, 2900 Queen Lane, Philadelphia, PA 19129, USA.
| | - Anna Pastore
- Laboratory of Biochemistry, IRCCS Bambino Gesù Children's Hospital, Viale San Paolo 15, 00146 Rome, Italy.
| | - Gessica Vasco
- Movement Analysis and Robotics Laboratory (MARLab), Neurorehabilitation Unit, Department of Neurosciences, IRCCS Bambino Gesù Children's Hospital, Via Torre di Palidoro, Passoscuro Fiumicino, 00050 Rome, Italy.
| | - Tommaso Schirinzi
- Movement Analysis and Robotics Laboratory (MARLab), Neurorehabilitation Unit, Department of Neurosciences, IRCCS Bambino Gesù Children's Hospital, Via Torre di Palidoro, Passoscuro Fiumicino, 00050 Rome, Italy.
| | - Rosalba Carrozzo
- Unit of Neuromuscular and Neurodegenerative Diseases, IRCCS Bambino Gesù Children's Hospital, Viale San Paolo 15, 00146 Rome, Italy.
| | - Enrico Bertini
- Unit of Neuromuscular and Neurodegenerative Diseases, IRCCS Bambino Gesù Children's Hospital, Viale San Paolo 15, 00146 Rome, Italy.
| | - Fiorella Piemonte
- Unit of Neuromuscular and Neurodegenerative Diseases, IRCCS Bambino Gesù Children's Hospital, Viale San Paolo 15, 00146 Rome, Italy.
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202
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Smith NL, Wilson AL, Gandhi J, Vatsia S, Khan SA. Ozone therapy: an overview of pharmacodynamics, current research, and clinical utility. Med Gas Res 2017; 7:212-219. [PMID: 29152215 PMCID: PMC5674660 DOI: 10.4103/2045-9912.215752] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The use of ozone (O3) gas as a therapy in alternative medicine has attracted skepticism due to its unstable molecular structure. However, copious volumes of research have provided evidence that O3's dynamic resonance structures facilitate physiological interactions useful in treating a myriad of pathologies. Specifically, O3 therapy induces moderate oxidative stress when interacting with lipids. This interaction increases endogenous production of antioxidants, local perfusion, and oxygen delivery, as well as enhances immune responses. We have conducted a comprehensive review of O3 therapy, investigating its contraindications, routes and concentrations of administration, mechanisms of action, disinfectant properties in various microorganisms, and its medicinal use in different pathologies. We explore the therapeutic value of O3 in pathologies of the cardiovascular system, gastrointestinal tract, genitourinary system, central nervous system, head and neck, musculoskeletal, subcutaneous tissue, and peripheral vascular disease. Despite compelling evidence, further studies are essential to mark it as a viable and quintessential treatment option in medicine.
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Affiliation(s)
| | - Anthony L Wilson
- Department of Physiology and Biophysics, Stony Brook University School of Medicine, Stony Brook, NY, USA
| | - Jason Gandhi
- Department of Physiology and Biophysics, Stony Brook University School of Medicine, Stony Brook, NY, USA.,Medical Student Research Institute, St. George's University School of Medicine, Grenada, West Indies
| | - Sohrab Vatsia
- Department of Cardiothoracic Surgery, Lenox Hill Hospital, New York, NY, USA
| | - Sardar Ali Khan
- Department of Physiology and Biophysics, Stony Brook University School of Medicine, Stony Brook, NY, USA.,Department of Urology, Stony Brook University School of Medicine, Stony Brook, NY, USA
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203
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Gouge J, Vannini A. New tricks for an old dog: Brf2-dependent RNA Polymerase III transcription in oxidative stress and cancer. Transcription 2017; 9:61-66. [PMID: 28854119 PMCID: PMC5791813 DOI: 10.1080/21541264.2017.1335269] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 05/22/2017] [Accepted: 05/22/2017] [Indexed: 01/07/2023] Open
Abstract
Here, we discuss the role of Brf2, an RNA Polymerase III core transcription factor, as a master switch of the oxidative stress response. We highlight the interplay of Brf2 with the Nrf2/Keap1 pathway, as well as the role of Brf2 in cancer and other possible regulations.
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204
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Abstract
Five out of eight human glutathione peroxidases (GPxes) are selenoproteins and thus their expression depends on the selenium (Se) supply. Most Se-dependent GPxes are downregulated in tumor cells, while only GPx2 is considerably upregulated. Whether expression profiles of GPxes predict tumor development and patient survival is controversially discussed. Also, results from in vitro and in vivo studies modulating the expression of GPx isoforms provide evidence for both anti- and procarcinogenic mechanisms. GPxes are able to reduce hydroperoxides, which otherwise would damage DNA, possibly resulting in DNA mutations, modulate redox-sensitive signaling pathways affecting proliferation, differentiation, and cellular metabolism or initiate cell death. Considering these different processes, the role and functions of individual Se-dependent GPx isoforms will be discussed herein in the context of tumorigenesis.
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Affiliation(s)
- Anna P Kipp
- Institute of Nutrition, Friedrich Schiller University Jena, Jena, Germany.
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205
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Abstract
The cytosolic selenoprotein thioredoxin reductase 1 (TrxR1, encoded in human by TXNRD1) is implied to have several different roles in relation to cancer. Its physiologic functions may protect normal cells from carcinogenesis, but may also promote cancer progression if carcinogenesis nonetheless occurs. With distinct links to Nrf2 signaling, ribonucleotide reductase-dependent production of deoxyribonucleotides and its support of several antioxidant systems counteracting oxidative stress, the metabolic pathways regulated, and affected by TrxR1, are altogether of crucial importance in cancer. These pathways and causal relationships are at the same time highly intricate. In spite of the complexity in the cellular redox networks, several observations discussed in this chapter suggest that specific targeting of TrxR1 may be promising as a mechanistic principle for anticancer therapy.
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206
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Cellular adaptation to xenobiotics: Interplay between xenosensors, reactive oxygen species and FOXO transcription factors. Redox Biol 2017; 13:646-654. [PMID: 28818793 PMCID: PMC5558470 DOI: 10.1016/j.redox.2017.07.015] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 07/20/2017] [Accepted: 07/28/2017] [Indexed: 12/22/2022] Open
Abstract
Cells adapt to an exposure to xenobiotics by upregulating the biosynthesis of proteins involved in xenobiotic metabolism. This is achieved largely via activation of cellular xenosensors that modulate gene expression. Biotransformation of xenobiotics frequently comes with the generation of reactive oxygen species (ROS). ROS, in turn, are known modulators of signal transduction processes. FOXO (forkhead box, class O) transcription factors are among the proteins deeply involved in the cellular response to stress, including oxidative stress elicited by the formation of ROS. On the one hand, FOXO activity is modulated by ROS, while on the other, FOXO target genes include many that encode antioxidant proteins – thereby establishing a regulatory circuit. Here, the role of ROS and of FOXOs in the regulation of xenosensor transcriptional activities will be discussed. Constitutive androstane receptor (CAR), pregnane X receptor (PXR), peroxisome proliferator-activated receptors (PPARs), arylhydrocarbon receptor (AhR) and nuclear factor erythroid 2-related factor 2 (Nrf2) all interact with FOXOs and/or ROS. The two latter not only fine-tune the activities of xenosensors but also mediate interactions between them. As a consequence, the emerging picture of an interplay between xenosensors, ROS and FOXO transcription factors suggests a modulatory role of ROS and FOXOs in the cellular adaptive response to xenobiotics. Exposure of cells to xenobiotics may trigger formation of reactive oxygen species. Xenosensors respond to xenobiotics by upregulation of xenobiotic metabolism. FOXO transcription factors modulate the activities of several xenosensors. ROS affect FOXO activity, and FOXO target genes include antioxidant proteins. FOXOs bridge xenobiotic-induced ROS generation and xenosensor regulation.
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207
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Yu P, Wang C, Chen P, Lee M. YAP1 homologue-mediated redox sensing is crucial for a successful infection by Monilinia fructicola. MOLECULAR PLANT PATHOLOGY 2017; 18:783-797. [PMID: 27239957 PMCID: PMC6638302 DOI: 10.1111/mpp.12438] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 05/17/2016] [Accepted: 05/26/2016] [Indexed: 05/20/2023]
Abstract
Monilinia fructicola (G. Winter) Honey is a devastating pathogen on Rosaceae which causes blossom blight and fruit rot. Only a few studies related to the plant-pathogen interaction have been published and there is limited knowledge on the relationship between oxidative stress and successful infection in M. fructicola. In this study, we cloned and characterized a redox-responsive transcription factor MFAP1, a YAP1 homologue. MfAP1-silenced strains were generated by polyethylene glycol-mediated protoplast transformation or Agrobacterium T-DNA-mediated transformation. Pathogenicity assay demonstrated that MfAP1-silenced strains caused smaller lesions on rose and peach petals. Transformants carrying extra copies of MfAP1, driven by the native promoter, were generated for MfAP1 overexpression. Interestingly, MfAP1-overexpressing strains also caused smaller lesions on rose petals. Strains carrying two copies of MfAP1 accumulated reactive oxygen species (ROS) at higher levels and exhibited delayed accumulation of MfAP1 transcripts compared with the wild-type during pathogenesis. By the analysis of ROS production and the expression patterns of redox- and virulence-related genes in the wild-type strain and an MfAP1-overexpressing strain, we found that the M. fructicola wild-type strain responded to oxidative stress at the infection site, activated the expression of MfAP1 and up-regulated the genes required for ROS detoxification and fungal virulence. In contrast, MfAP1 expression in the MfAP1-overexpressing strain was suppressed after the induction of a strong oxidative burst at the infection site, altering the expression of ROS detoxification and virulence-related genes. Our results highlight the importance of MfAP1 and ROS accumulation in the successful infection of M. fructicola.
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Affiliation(s)
- Pei‐Ling Yu
- Department of Plant PathologyNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
- NCHU‐UCD Plant and Food Biotechnology CenterNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
- Agricultural Biotechnology CenterNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
| | - Chih‐Li Wang
- Department of Plant PathologyNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
| | - Pei‐Yin Chen
- Department of Plant PathologyNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
| | - Miin‐Huey Lee
- Department of Plant PathologyNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
- NCHU‐UCD Plant and Food Biotechnology CenterNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
- Agricultural Biotechnology CenterNational Chung‐Hsing University250 Kuo‐Kuang Rd.Taichung402Taiwan
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208
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Xu Q, Huff LP, Fujii M, Griendling KK. Redox regulation of the actin cytoskeleton and its role in the vascular system. Free Radic Biol Med 2017; 109:84-107. [PMID: 28285002 PMCID: PMC5497502 DOI: 10.1016/j.freeradbiomed.2017.03.004] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/17/2017] [Accepted: 03/06/2017] [Indexed: 12/17/2022]
Abstract
The actin cytoskeleton is critical for form and function of vascular cells, serving mechanical, organizational and signaling roles. Because many cytoskeletal proteins are sensitive to reactive oxygen species, redox regulation has emerged as a pivotal modulator of the actin cytoskeleton and its associated proteins. Here, we summarize work implicating oxidants in altering actin cytoskeletal proteins and focus on how these alterations affect cell migration, proliferation and contraction of vascular cells. Finally, we discuss the role of oxidative modification of the actin cytoskeleton in vivo and highlight its importance for vascular diseases.
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Affiliation(s)
- Qian Xu
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, 308a WMB, Atlanta, GA 30322, United States; Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China
| | - Lauren P Huff
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, 308a WMB, Atlanta, GA 30322, United States
| | - Masakazu Fujii
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Japan
| | - Kathy K Griendling
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, 308a WMB, Atlanta, GA 30322, United States.
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209
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Cobley JN, Close GL, Bailey DM, Davison GW. Exercise redox biochemistry: Conceptual, methodological and technical recommendations. Redox Biol 2017; 12:540-548. [PMID: 28371751 PMCID: PMC5377294 DOI: 10.1016/j.redox.2017.03.022] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 03/23/2017] [Accepted: 03/24/2017] [Indexed: 12/16/2022] Open
Abstract
Exercise redox biochemistry is of considerable interest owing to its translational value in health and disease. However, unaddressed conceptual, methodological and technical issues complicate attempts to unravel how exercise alters redox homeostasis in health and disease. Conceptual issues relate to misunderstandings that arise when the chemical heterogeneity of redox biology is disregarded: which often complicates attempts to use redox-active compounds and assess redox signalling. Further, that oxidised macromolecule adduct levels reflect formation and repair is seldom considered. Methodological and technical issues relate to the use of out-dated assays and/or inappropriate sample preparation techniques that confound biochemical redox analysis. After considering each of the aforementioned issues, we outline how each issue can be resolved and provide a unifying set of recommendations. We specifically recommend that investigators: consider chemical heterogeneity, use redox-active compounds judiciously, abandon flawed assays, carefully prepare samples and assay buffers, consider repair/metabolism, use multiple biomarkers to assess oxidative damage and redox signalling.
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Affiliation(s)
- James N Cobley
- Department for Sport and Exercise Sciences, Abertay University, 40 Bell Street, Dundee, Scotland DD1 1HG, UK.
| | - Graeme L Close
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Tom Reilly Building, Liverpool, England L3 3AF, UK
| | - Damian M Bailey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, CF37 4AT, UK; Faculty of Medicine, Reichwald Health Sciences Centre, University of British Columbia-Okanagan, Kelowna, British Columbia, Canada
| | - Gareth W Davison
- Sport and Exercise Science Research Institute, Ulster University, Belfast, BT37 OQB, UK
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210
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Keap1/Nrf2 pathway in kidney cancer: frequent methylation of KEAP1 gene promoter in clear renal cell carcinoma. Oncotarget 2017; 8:11187-11198. [PMID: 28061437 PMCID: PMC5355256 DOI: 10.18632/oncotarget.14492] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 12/27/2016] [Indexed: 12/21/2022] Open
Abstract
The Keap1/Nrf2 pathway is a master regulator of the cellular redox state through the induction of several antioxidant defence genes implicated in chemotherapeutic drugs resistance of tumor cells. An increasing body of evidence supports a key role for Keap1/Nrf2 pathway in kidney diseases and renal cell carcinoma (RCC), but data concerning the molecular basis and the clinical effect of its deregulation remain incomplete. Here we present a molecular profiling of the KEAP1 and NFE2L2 genes in five different Renal Cell Carcinoma histotypes by analysing 89 tumor/normal paired tissues (clear cell Renal Carcinoma, ccRCCs; Oncocytomas; Papillary Renal Cell Carcinoma Type 1, PRCC1; Papillary Renal Cell Carcinoma Type 2, PRCC2; and Chromophobe Cell Carcinoma). A tumor-specific DNA methylation of the KEAP1 gene promoter region was found as a specific feature of the ccRCC subtype (18/37, 48.6%) and a direct correlation with mRNA levels was confirmed by in vitro 5-azacytidine treatment. Analysis of an independent data set of 481 ccRCC and 265 PRCC tumors corroborates our results and multivariate analysis reveals a significant correlation among ccRCCs epigenetic KEAP1 silencing and staging, grading and overall survival. Our molecular results show for the the first time the epigenetic silencing of KEAP1 promoter as the leading mechanism for modulation of KEAP1 expression in ccRCCs and corroborate the driver role of Keap1/Nrf2 axis deregulation with potential new function as independent epigenetic prognostic marker in renal cell carcinoma.
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211
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Ha SY, Paik YH, Yang JW, Lee MJ, Bae H, Park CK. NADPH Oxidase 1 and NADPH Oxidase 4 Have Opposite Prognostic Effects for Patients with Hepatocellular Carcinoma after Hepatectomy. Gut Liver 2017; 10:826-35. [PMID: 27282266 PMCID: PMC5003208 DOI: 10.5009/gnl15543] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/02/2015] [Accepted: 12/31/2015] [Indexed: 01/08/2023] Open
Abstract
Background/Aims Nicotinamide adenine dinucleotide phosphate oxidase (NOX)-mediated reactive oxygen species contribute to various liver diseases, including hepatocellular carcinoma (HCC). Uncertainties remain regarding the prognostic relevance of NOX1 and NOX4 protein expression in HCC. Methods NOX1 and NOX4 protein expression was examined by using immunohistochemistry in tumor tissue from 227 HCC patients who underwent hepatectomy. Results High immunoreactivity for NOX1 was observed in 197 (86.8%) of the 227 HCC cases and low immunoreactivity for NOX4 in 112 (49.3%). NOX1 and NOX4 proteins had opposite prognostic effects. High NOX1 expression was an independent predictor of both shorter recurrence-free survival (RFS) (p<0.01) and shorter overall survival (OS) (p=0.01). Low NOX4 expression was an independent predictor of both shorter RFS (p<0.01) and shorter OS (p=0.01). Subgroup analysis showed that, among patients with normal α-fetoprotein levels, patients with tumor size ≤5.0 cm and patients in Barcelona Clinic Liver Cancer stage A, high NOX1 expression had unfavorable effects on RFS, whereas low NOX4 expression had unfavorable effects on both RFS and OS. Conclusions These findings demonstrated that NOX1 and NOX4 protein expression had opposite prognostic effects for HCC patients. Moreover, both proteins had prognostic value in HCC patients with normal α-fetoprotein levels or with early-stage HCC.
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Affiliation(s)
- Sang Yun Ha
- Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Yong-Han Paik
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jung Wook Yang
- Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Min Ju Lee
- Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hyunsik Bae
- Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Cheol-Keun Park
- Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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212
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Knockout of the peroxiredoxin 5 homologue PFAOP does not affect the artemisinin susceptibility of Plasmodium falciparum. Sci Rep 2017; 7:4410. [PMID: 28667301 PMCID: PMC5493673 DOI: 10.1038/s41598-017-04277-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 05/03/2017] [Indexed: 01/07/2023] Open
Abstract
Artemisinins are the current mainstay of malaria chemotherapy. Their exact mode of action is an ongoing matter of debate, and several factors have recently been reported to affect an early stage of artemisinin resistance of the most important human malaria parasite Plasmodium falciparum. Here, we identified a locus on chromosome 7 that affects the artemisinin susceptibility of P. falciparum in a quantitative trait locus analysis of a genetic cross between strains 7G8 and GB4. This locus includes the peroxiredoxin gene PFAOP. However, steady-state kinetic data with recombinant PfAOP do not support a direct interaction between this peroxidase and the endoperoxide artemisinin. Furthermore, neither the overexpression nor the deletion of the encoding gene affected the IC50 values for artemisinin or the oxidants diamide and tert-butyl hydroperoxide. Thus, PfAOP is dispensable for blood stage parasite survival, and the correlation between the artemisinin susceptibility and chromosome 7 is probably based on another gene within the identified locus.
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213
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Bellezza I, Scarpelli P, Pizzo SV, Grottelli S, Costanzi E, Minelli A. ROS-independent Nrf2 activation in prostate cancer. Oncotarget 2017; 8:67506-67518. [PMID: 28978049 PMCID: PMC5620189 DOI: 10.18632/oncotarget.18724] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 05/23/2017] [Indexed: 12/16/2022] Open
Abstract
In prostate cancer, oxidative stress and the subsequent Nrf2 activation promote the survival of cancer cells and acquired chemoresistance. Nrf2 links prostate cancer to endoplasmic reticulum stress, an event that triggers the unfolded protein response, aiming to restore cellular homeostasis as well as an adaptive survival mechanism. Glucose-regulated protein of 78 kD /immunoglobulin heavy chain binding protein (GRP78/BiP) is a key molecular chaperone in the endoplasmic reticulum that, when expressed at the cell surface, acts as a receptor for several signaling pathways enhancing antiapoptotic and proliferative signals. We showed GRP78/BiP translocation to PC3 cell surface in the presence of tunicamycin, an ER stress inductor, and demonstrated the existence of a GRP78/BiP-dependent non-canonical Nrf2 activation, responsible for increased resistance to ER-stress induced apoptosis. We found that, even in the absence of ROS production, tunicamycin causes Nrf2 activation, and activates Akt signaling, events bulnted by anti-GRP78/BiP antibody treatment. The presence of GRP78/BiP at the cell surface might be exploited for the immunotherapeutic strategy of prostate cancer since its blockage by anti-GRP78/BiP antibodies might promote cancer death by suppressing some of the several molecular protective mechanisms found in aggressive cancer cells.
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Affiliation(s)
- Ilaria Bellezza
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Paolo Scarpelli
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | | | - Silvia Grottelli
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Egidia Costanzi
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Alba Minelli
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
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214
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Effects of mild ozonisation on gene expression and nuclear domains organization in vitro. Toxicol In Vitro 2017; 44:100-110. [PMID: 28652203 DOI: 10.1016/j.tiv.2017.06.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 06/15/2017] [Accepted: 06/22/2017] [Indexed: 12/14/2022]
Abstract
In the last two decades, the use of ozone (O3) as a complementary medical approach has progressively been increasing; however, its application is still limited due to the numerous doubts about its possible toxicity, despite the low concentrations used in therapy. For an appropriate and safe clinical application of a potentially toxic agent such as O3, it is crucial to elucidate the cellular response to its administration. Molecular analyses and transmission electron microscopy were here combined to investigate in vitro the effects of O3 administration on transcriptional activity and nuclear domains organization of cultured SH-SY5Y neuronal cells; low O3 concentrations were used as those currently administered in clinical practice. Mild ozonisation did not affect cell proliferation or death, while molecular analyses showed an O3-induced modulation of some genes involved in the cell response to stress (HMOX1, ERCC4, CDKN1A) and in the transcription machinery (CTDSP1). Ultrastructural cytochemistry after experiments of bromouridine incorporation consistently demonstrated an increased transcriptional rate at both the nucleoplasmic (mRNA) and the nucleolar (rRNA) level. No ultrastructural alteration of nuclear domains was observed. Our molecular, ultrastructural and cytochemical data demonstrate that a mild toxic stimulus such as mild ozonisation stimulate cell protective pathways and nuclear transcription, without altering cell viability. This could possibly account for the positive effects observed in ozone-treated patients.
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215
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Macias-Barragan J, Huerta-Olvera SG, Hernandez-Cañaveral I, Pereira-Suarez AL, Montoya-Buelna M. Cadmium and α-lipoic acid activate similar de novo synthesis and recycling pathways for glutathione balance. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 52:38-46. [PMID: 28366867 DOI: 10.1016/j.etap.2017.03.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 03/06/2017] [Accepted: 03/07/2017] [Indexed: 06/07/2023]
Abstract
Glutathione (GSH) protects cells against oxidative stress. Redox modifiers induce GSH biosynthesis and recycling to maintain reduced environment inside cells. Cadmium (Cd2+) is a heavy metal that activates redox-sensitive transcriptional factors. The antioxidant α-lipoic acid (ALA) has shown to modulate GSH pathways. This study aimed to investigate de novo synthesis and recycling pathways for GSH balance by different Cd2+ concentrations and ALA in HepG2 cells. ALA activates Nrf2 pathway leading to GSH increment. Pre-treatment with 1μM Cd2+ or ALA produces tolerance to 5μM Cd2+ toxic effects. 5μM Cd2+ exposure significantly augmented nuclear Nrf2, GSH and GCLC, GCLM, HMOX1, TNFα and IL-6 mRNA expression but not GSR, however these upsurges were significantly abrogated by ALA or 1μM Cd2+ pre-treatments. Exposure to low Cd2+ concentration generate timely protective responses, similar to that elicited by ALA, maintaining a normal redox balance inside the cell due to GSH replenishment.
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Affiliation(s)
- Jose Macias-Barragan
- Department of Health Sciences, CUValles, University of Guadalajara, Guadalajara - Ameca Rd Km. 45.5, Ameca, Jalisco, 46600, Mexico; Laboratory of Immunology, Department of Physiology, CUCS, University of Guadalajara, 950 Sierra Mojada St., Guadalajara, Jalisco, 44340, Mexico.
| | - Selene G Huerta-Olvera
- Department of Medical and Life Sciences, CUCienega, University of Guadalajara, 1115 Universidad Ave., Ocotlán, Jalisco, 47820, Mexico
| | - Ivan Hernandez-Cañaveral
- Department of Microbiology and Pathology, CUCS, University of Guadalajara, 950 Sierra Mojada St., Guadalajara, Jalisco, 44340, Mexico
| | - Ana Laura Pereira-Suarez
- Laboratory of Immunology, Department of Physiology, CUCS, University of Guadalajara, 950 Sierra Mojada St., Guadalajara, Jalisco, 44340, Mexico
| | - Margarita Montoya-Buelna
- Laboratory of Immunology, Department of Physiology, CUCS, University of Guadalajara, 950 Sierra Mojada St., Guadalajara, Jalisco, 44340, Mexico
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216
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Smith KA, Waypa GB, Schumacker PT. Redox signaling during hypoxia in mammalian cells. Redox Biol 2017; 13:228-234. [PMID: 28595160 PMCID: PMC5460738 DOI: 10.1016/j.redox.2017.05.020] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/08/2017] [Accepted: 05/26/2017] [Indexed: 12/18/2022] Open
Abstract
Hypoxia triggers a wide range of protective responses in mammalian cells, which are mediated through transcriptional and post-translational mechanisms. Redox signaling in cells by reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) occurs through the reversible oxidation of cysteine thiol groups, resulting in structural modifications that can change protein function profoundly. Mitochondria are an important source of ROS generation, and studies reveal that superoxide generation by the electron transport chain increases during hypoxia. Other sources of ROS, such as the NAD(P)H oxidases, may also generate oxidant signals in hypoxia. This review considers the growing body of work indicating that increased ROS signals during hypoxia are responsible for regulating the activation of protective mechanisms in diverse cell types.
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Affiliation(s)
- Kimberly A Smith
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Gregory B Waypa
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Paul T Schumacker
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
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217
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Quantitative biology of hydrogen peroxide signaling. Redox Biol 2017; 13:1-7. [PMID: 28528123 PMCID: PMC5436100 DOI: 10.1016/j.redox.2017.04.039] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 04/05/2017] [Accepted: 04/08/2017] [Indexed: 12/13/2022] Open
Abstract
Hydrogen peroxide (H2O2) controls signaling pathways in cells by oxidative modulation of the activity of redox sensitive proteins denominated redox switches. Here, quantitative biology concepts are applied to review how H2O2 fulfills a key role in information transmission. Equations described lay the foundation of H2O2 signaling, give new insights on H2O2 signaling mechanisms, and help to learn new information from common redox signaling experiments. A key characteristic of H2O2 signaling is that the ratio between reduction and oxidation of redox switches determines the range of H2O2 concentrations to which they respond. Thus, a redox switch with low H2O2-dependent oxidability and slow reduction rate responds to the same range of H2O2 concentrations as a redox switch with high H2O2-dependent oxidability, but that is rapidly reduced. Yet, in the first case the response time is slow while in the second case is rapid. H2O2 sensing and transmission of information can be done directly or by complex mechanisms in which oxidation is relayed between proteins before oxidizing the final regulatory redox target. In spite of being a very simple molecule, H2O2 has a key role in cellular signaling, with the reliability of the information transmitted depending on the inherent chemical reactivity of redox switches, on the presence of localized H2O2 pools, and on the molecular recognition between redox switches and their partners. Hydrogen peroxide signaling proceeds through oxidation of redox switches. Oxidation of redox switches can be direct or mediated by highly reactive sensors. Response of redox switches is controlled by their oxidability and reduction rate. Localized protein interactions ensure the accuracy of information transmission.
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218
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Sthijns MM, Schiffers PM, Janssen GM, Lemmens KJ, Ides B, Vangrieken P, Bouwman FG, Mariman EC, Pader I, Arnér ES, Johansson K, Bast A, Haenen GR. Rutin protects against H 2 O 2 -triggered impaired relaxation of placental arterioles and induces Nrf2-mediated adaptation in Human Umbilical Vein Endothelial Cells exposed to oxidative stress. Biochim Biophys Acta Gen Subj 2017; 1861:1177-1189. [DOI: 10.1016/j.bbagen.2017.03.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 02/15/2017] [Accepted: 03/06/2017] [Indexed: 01/06/2023]
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219
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Cell responses to cariogenic microorganisms and dental resin materials—Crosstalk at the dentin-pulp interface? Dent Mater 2017; 33:514-524. [DOI: 10.1016/j.dental.2017.02.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 02/13/2017] [Accepted: 02/17/2017] [Indexed: 12/22/2022]
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220
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Gào X, Schöttker B. Reduction-oxidation pathways involved in cancer development: a systematic review of literature reviews. Oncotarget 2017; 8:51888-51906. [PMID: 28881698 PMCID: PMC5584299 DOI: 10.18632/oncotarget.17128] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 04/03/2017] [Indexed: 12/24/2022] Open
Abstract
Oxidative stress results from an imbalance of the reactive oxygen species/reactive nitrogen species (ROS/RNS) production and the oxidants defense system. Extensive research during the last decades has revealed that oxidative stress can mediate cancer initiation and development by leading not only to molecular damage but also to a disruption of reduction-oxidation (redox) signaling. In order to provide a global overview of the redox signaling pathways, which play a role in cancer formation, we conducted a systematic literature search in PubMed and ISI Web of Science and identified 185 relevant reviews published in the last 10 years. The 20 most frequently described pathways were selected to be presented in this systematic review and could be categorized into 3 groups: Intracellular ROS/RNS generating organelles and enzymes, signal transduction cascades kinases/phosphatases and transcription factors. Intracellular ROS/RNS generation organelles are mitochondria, endoplasmic reticulum and peroxisomes. Enzymes, including NOX, COX, LOX and NOS, are the most prominent enzymes generating ROS/RNS. ROS/RNS act as redox messengers of transmembrane receptors and trigger the activation or inhibition of signal transduction kinases/phosphatases, such as the family members of protein tyrosine kinases and protein tyrosine phosphatases. Furthermore, these reactions activate downstream signaling pathways including protein kinase of the MAPK cascade, PI3K and PKC. The kinases and phosphatases regulate the phosphorylation status of transcription factors including APE1/Ref-1, HIF-1α, AP-1, Nrf2, NF-κB, p53, FOXO, STAT, and β-catenin. Finally, we briefly discuss cancer prevention and treatment opportunities, which address redox pathways and further research needs.
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Affiliation(s)
- Xīn Gào
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center, Heidelberg, Germany.,Network Aging Research, University of Heidelberg, Heidelberg, Germany
| | - Ben Schöttker
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center, Heidelberg, Germany.,Network Aging Research, University of Heidelberg, Heidelberg, Germany.,Institute of Health Care and Social Sciences, FOM University, Essen, Germany
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221
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Lyublinskaya OG, Ivanova JS, Pugovkina NA, Kozhukharova IV, Kovaleva ZV, Shatrova AN, Aksenov ND, Zenin VV, Kaulin YA, Gamaley IA, Nikolsky NN. Redox environment in stem and differentiated cells: A quantitative approach. Redox Biol 2017; 12:758-769. [PMID: 28426982 PMCID: PMC5393314 DOI: 10.1016/j.redox.2017.04.016] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 04/06/2017] [Accepted: 04/08/2017] [Indexed: 01/07/2023] Open
Abstract
Stem cells are believed to maintain a specific intracellular redox status through a combination of enhanced removal capacity and limited production of ROS. In the present study, we challenge this assumption by developing a quantitative approach for the analysis of the pro- and antioxidant ability of human embryonic stem cells in comparison with their differentiated descendants, as well as adult stem and non-stem cells. Our measurements showed that embryonic stem cells are characterized by low ROS level, low rate of extracellular hydrogen peroxide removal and low threshold for peroxide-induced cytotoxicity. However, biochemical normalization of these parameters to cell volume/protein leads to matching of normalized values in stem and differentiated cells and shows that tested in the present study cells (human embryonic stem cells and their fibroblast-like progenies, adult mesenchymal stem cells, lymphocytes, HeLa) maintain similar intracellular redox status. Based on these observations, we propose to use ROS concentration averaged over the cell volume instead of ROS level as a measure of intracellular redox balance. We show that attempts to use ROS level for comparative analysis of redox status of morphologically different cells could lead to false conclusions. Methods for the assessment of ROS concentration based on flow cytometry analysis with the use of H2DCFDA dye and HyPer, genetically encoded probe for hydrogen peroxide, are discussed. Intracellular ROS level depends on the cell size. We propose to use the concept of ROS concentration instead of the ROS level. Quantification of basic redox parameters challenges the hypothesis about the highly specific redox environment in stem cells.
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Affiliation(s)
- O G Lyublinskaya
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia.
| | - Ju S Ivanova
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia; Department of Medical Physics, Institute of Physics, Nanotechnology and Telecommunications, Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya st. 29, St. Petersburg 195251, Russia
| | - N A Pugovkina
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - I V Kozhukharova
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - Z V Kovaleva
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - A N Shatrova
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - N D Aksenov
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - V V Zenin
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - Yu A Kaulin
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - I A Gamaley
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
| | - N N Nikolsky
- Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg 194064, Russia
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222
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Peroxynitrite Activates the NLRP3 Inflammasome Cascade in SOD1(G93A) Mouse Model of Amyotrophic Lateral Sclerosis. Mol Neurobiol 2017; 55:2350-2361. [PMID: 28357805 DOI: 10.1007/s12035-017-0502-x] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 03/20/2017] [Indexed: 01/02/2023]
Abstract
Neuroinflammation, characterized by the appearance of reactive microglial and astroglial cells, is one of the several pathogenic mechanisms of amyotrophic lateral sclerosis (ALS), a fast-progressing and fatal neurodegenerative disease. Cerebrospinal fluid and spinal cord of ALS patients and SOD1 mutant mice show high concentrations of IL-1β. This interleukin, expressed as an inactive precursor, undergoes a proteolytic maturation by caspase1, whose activation, in turn, depends on inflammasomes. Whether and how inflammasome is activated in ALS models is still to be clarified. The mechanism of inflammasome activation was studied in murine microglial cells overexpressing hSOD1(G93A) and verified in the spinal cord of hSOD1(G93A) mice. Murine microglial hSOD1(G93A) cells express all the inflammasome components and LPS activates caspase1 leading to an increase in the secretion of IL-1β. By activating NF-κB, LPS increases ROS and NO levels that spontaneously react to form peroxynitrite, thus leading to protein nitration. Reduction in peroxynitrite levels results in a decrease in caspase1 activity. Protein nitration and caspase1 activity are concomitantly increased in the spinal cord of pre-symptomatic SOD1(G93A) mice. Oxidative/nitrosative stress induces peroxynitrite formation that may be a key trigger of caspase1/inflammasome activation. Peroxynitrite formation may play a critical role in inflammasome activation and might be exploited as potential therapeutic target for ALS.
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223
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Dalto DB, Lapointe J, Matte JJ. Assessment of antioxidative and selenium status by seleno-dependent glutathione peroxidase activity in different blood fractions using a pig model: issues for clinical nutrition and research. J Anim Physiol Anim Nutr (Berl) 2017; 102:184-193. [PMID: 28304104 DOI: 10.1111/jpn.12677] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 12/18/2016] [Indexed: 01/11/2023]
Abstract
Blood seleno-dependent glutathione peroxidase (SeGPX) activity is widely used as a metabolic indicator of systemic antioxidative status despite inconsistent responses in the literature. This study aimed to compare SeGPX activity profiles in different blood fractions, expressed with different reference units, and assess their impact on interpretation of results. Two studies on selenium (Se) metabolism in gilts, including long-term and peri-oestrus SeGPX activity profiles, were submitted to analysis of variance with double repeated measures, after data set standardization. Differences between studies were experimental period (three post-pubertal oestrus or five post-pubertal oestrus +30 days of gestation) and sample type (whole blood or blood plasma). No difference was observed between whole-blood long-term profiles (three oestrus) for SeGPX activity/mg haemoglobin (SeGPXhb) vs. SeGPX activity/ml whole blood (SeGPXwb; p = 0.29). No long-term difference was observed in whole blood between profiles according to dietary Se provision (basal and dietary Se-supplemented groups; p ≥ 0.12). Blood plasma long-term profiles (five oestrus + 30 days gestation) for SeGPX/mg blood plasma protein (SeGPXpro) were different from SeGPX/ml blood plasma (SeGPXpla) according or not to Se provision (p ≤ 0.007 and p < 0.001 respectively). However, regardless of Se provision (p ≥ 0.80), when excluding gestation from the model, blood plasma profiles were similar. During the peri-oestrus period (day -4 to +3), regardless of Se provision, SeGPX activity profiles differed according to reference units in both studies (p < 0.001). However, considering Se provision, similar profiles were observed in whole blood and blood plasma (p ≥ 0.27) for basal Se groups, whereas in Se-supplemented groups they differed for both sample types (p ≤ 0.02). In conclusion, reference units influence interpretation of SeGPX activity according to physiological state. During oxidative stress periods, this effect depends upon dietary Se provision.
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Affiliation(s)
- D B Dalto
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada
| | - J Lapointe
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada
| | - J-J Matte
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada
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224
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Time- and cell-resolved dynamics of redox-sensitive Nrf2, HIF and NF-κB activities in 3D spheroids enriched for cancer stem cells. Redox Biol 2017; 12:403-409. [PMID: 28319891 PMCID: PMC5357678 DOI: 10.1016/j.redox.2017.03.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/06/2017] [Accepted: 03/09/2017] [Indexed: 12/18/2022] Open
Abstract
Cancer cells have an altered redox status, with changes in intracellular signaling pathways. The knowledge of how such processes are regulated in 3D spheroids, being well-established tumor models, is limited. To approach this question we stably transfected HCT116 cells with a pTRAF reporter that enabled time- and cell-resolved activity monitoring of three redox-regulated transcription factors Nrf2, HIF and NF-κB in spheroids enriched for cancer stem cells. At the first day of spheroid formation, these transcription factors were activated and thereafter became repressed. After about a week, both HIF and Nrf2 were reactivated within the spheroid cores. Further amplifying HIF activation in spheroids by treatment with DMOG resulted in a dominant quiescent stem-cell-like phenotype, with high resistance to stress-inducing treatments. Auranofin, triggering oxidative stress and Nrf2 activation, had opposite effects with increased differentiation and proliferation. These novel high-resolution insights into spatiotemporal activation patterns demonstrate a striking coordination of redox regulated transcription factors within spheroids not occurring in conventional cell culture models.
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225
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Trosko JE, Lenz HJ. What roles do colon stem cells and gap junctions play in the left and right location of origin of colorectal cancers? J Cell Commun Signal 2017; 11:79-87. [PMID: 28220297 PMCID: PMC5362582 DOI: 10.1007/s12079-017-0381-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 02/02/2017] [Indexed: 12/15/2022] Open
Abstract
This "Commentary" examines an important clinical observation that right-sided colorectal cancers appear less treatable than the left-sided cancers. The concepts of (a) the "initiation/promotion/progression" process, (b) the stem cell hypothesis, (c) the role gap junctional intercellular communication, (d) cancer cells lacking GJIC either because of the non-expression of connexin genes or of non-functional gap junction proteins, and (e) the role of the microbiome in promoting initiated colon stem cells to divide symmetrically or asymmetrically are examined to find an explanation. It has been speculated that "embryonic-like" lesions in the ascending colon are initiated stem cells, promoted via symmetrical cell division, while the polyp-type lesions in the descending colon are initiated stem cells stimulated to divide asymmetrically. To test this hypothesis, experiments could be designed to examine if right-sided lesions might express Oct4A and ABCG2 genes but not any connexin genes, whereas the left-sided lesions might express a connexin gene, but not Oct4A or the ABCG2 genes. Treatment of the right sided lesions might include transcriptional regulators, whereas the left-sided lesions would need to restore the posttranslational status of the connexin proteins.
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Affiliation(s)
- James E Trosko
- Department Pediatrics and Human Development, College of Human Medicine, Michigan State University, 1129 Farm Lane, East Lansing, MI, 48824, USA.
| | - Heinz-Josef Lenz
- University of California Norris Comprehensive Cancer Center, Los Angeles, CA, USA
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Coballase-Urrutia E, Cárdenas-Rodríguez N, González-García MC, Núñez-Ramírez E, Floriano-Sánchez E, González-Trujano ME, Fernández-Rojas B, Pedraza-Chaverrí J, Montesinos-Correa H, Rivera-Espinosa L, Sampieri AIII, Carmona-Aparicio L. Biochemical and molecular modulation of CCl 4-induced peripheral and central damage by Tilia americana var. mexicanaextracts. Saudi Pharm J 2017; 25:319-331. [PMID: 28344485 PMCID: PMC5357111 DOI: 10.1016/j.jsps.2016.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 06/26/2016] [Indexed: 12/13/2022] Open
Abstract
Around the world, species from the genus Tilia are commonly used because of their peripheral and central medicinal effects; they are prepared as teas and used as tranquilizing, anticonvulsant, and analgesic agents. In this study, we provide evidence of the protective effects of organic and aqueous extracts (100 mg/kg, i.p.) obtained from the leaves of Tilia americana var. mexicana on CCl4-induced liver and brain damage in the rat. Protection was observed in the liver and brain (cerebellum, cortex and cerebral hemispheres) by measuring the activity of antioxidant enzymes and levels of malondialdehyde (MDA) using spectrophotometric methods. Biochemical parameters were also assessed in serum samples from the CCl4-treated rats. The T. americana var. mexicana leaf extracts provided significant protection against CCl4-induced peripheral and central damage by increasing the activity of antioxidant enzymes, diminishing lipid peroxidation, and preventing alterations in biochemical serum parameters, such as the levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), γ-globulin (γ-GLOB), serum albumin (ALB), total bilirubin (BB), creatinine (CREA) and creatine kinase (CK), relative to the control group. Additionally, we correlated gene expression with antioxidant activity in the experimental groups treated with the organic and aqueous Tilia extracts and observed a non-statistically significant positive correlation. Our results provide evidence of the underlying biomedical properties of T. americana var. mexicana that confer its neuro- and hepatoprotective effects.
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Key Words
- ALB, serum albumin
- ALP, alkaline phosphatase
- ALT, alanine aminotransferase
- AST, aspartate aminotransferase
- Ac.E, ethyl acetate extract group
- Antioxidant
- Aq.E, aqueous extract group
- Aq.E + CCl4, aqueous extract-CCl4 group
- BACT, β-actin
- BB, total bilirubin
- CAT, catalase
- CCl3OO•, trichloromethylperoxy radical
- CCl4, carbon tetrachloride
- CCl4-induced damage
- CDNB, 1-chloro-2,4-dinitrobenzene
- CK, creatine kinase
- COX-2, cyclooxygenase
- CREA, creatinine
- DMPO, 5,5-dimethyl-1-pyrrolin-N-oxide
- EDTA, ethylenediaminetetraacetic acid disodium salt
- G6PDH, glucose-6-phosphate dehydrogenase
- GAPDH, glyceraldehyde-3 phosphate dehydrogenase
- GPx, glutathione peroxidase
- GR, glutathione reductase
- GSH, reduced form of glutathione
- GSSG, oxidized form of glutathione
- GST, glutathione-S-transferase
- H2O2, hydrogen peroxide
- HO-1, heme oxygenase-1
- He.E, hexane extract group
- He.E + CCl4, hexane extract-CCl4 group
- Hepatoprotective effects
- MDA, malondialdehyde
- Me.E, methanol extract group
- Me.E + CCl4, methanol extract-CCl4 group
- NADPH, nicotinamide adenine dinucleotide phosphate
- NBT, nitro blue tetrazolium
- NF-κB, nuclear factor kappa-light-chain-enhancer of activated B cells
- Neuroprotective effects
- Nrf2, nuclear factor erythroid-derived 2-like 2
- O.O, olive oil group
- Oxidative stress
- PPARγ, peroxisome proliferator-activated receptor gamma
- RNA, ribonucleic acid
- ROS, reactive oxygen species
- SOD, superoxide dismutase
- SOD1, superoxide dismutase-1
- SOD2, superoxide dismutase-1
- TNF-α, tumor necrosis factor
- Tilia americana var. mexicana
- UK, United Kingdom
- USA, United States of America
- Var., variant
- [Formula: see text], trichloromethyl
- bp, base pair
- i.p., intraperitoneal administration
- iNOS, inducible nitric oxide synthase
- oxo8-dG, 8-hydroxy-2′-deoxyguanosine
- γ-GLOB, γ-globulin
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Affiliation(s)
| | | | | | - Eithan Núñez-Ramírez
- Military School of Graduate of Health, Multidisciplinary Research Laboratory, SEDENA, 11270 D.F. Mexico, Mexico
| | - Esaú Floriano-Sánchez
- Military School of Graduate of Health, Multidisciplinary Research Laboratory, SEDENA, 11270 D.F. Mexico, Mexico
| | - María Eva González-Trujano
- Laboratory of Neuropharmacology of Natural Products, National Institute of Psychiatry Ramon de la Fuente Muñiz, 14370 D.F. Mexico, Mexico
| | - Berenice Fernández-Rojas
- Department of Biology, Faculty of Chemistry, National Autonomous University of Mexico, 04150 D.F. Mexico, Mexico
| | - José Pedraza-Chaverrí
- Department of Biology, Faculty of Chemistry, National Autonomous University of Mexico, 04150 D.F. Mexico, Mexico
| | | | | | - Aristides III Sampieri
- Department of Comparative Biology, Faculty of Sciences, National Autonomous University of Mexico, 04150 D.F. Mexico, Mexico
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Johansson K, Cebula M, Rengby O, Dreij K, Carlström KE, Sigmundsson K, Piehl F, Arnér ESJ. Cross Talk in HEK293 Cells Between Nrf2, HIF, and NF-κB Activities upon Challenges with Redox Therapeutics Characterized with Single-Cell Resolution. Antioxid Redox Signal 2017; 26:229-246. [PMID: 26415122 PMCID: PMC5704776 DOI: 10.1089/ars.2015.6419] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
AIM Many transcription factors with importance in health and disease are redox regulated. However, how their activities may be intertwined in responses to redox-perturbing stimuli is poorly understood. To enable in-depth characterization of this aspect, we here developed a methodology for simultaneous determination of nuclear factor E2-related factor 2 (Nrf2), hypoxia-inducible factor (HIF), and nuclear factor kappa-light-chain-enhancer of activated B cell (NF-κB) activation at single-cell resolution, using a new tool named pTRAF (plasmid for transcription factor reporter activation based upon fluorescence). The pTRAF allowed determination of Nrf2, HIF, and NF-κB activities in a high-resolution and high-throughput manner, and we here assessed how redox therapeutics affected the activities of these transcription factors in human embryonic kidney cells (HEK293). RESULTS Cross talk was detected between the three signaling pathways upon some types of redox therapeutics, also by using inducers typically considered specific for Nrf2, such as sulforaphane or auranofin, hypoxia for HIF activation, or tumor necrosis factor alpha (TNFα) for NF-κB stimulation. Doxorubicin, at low nontoxic doses, potentiated TNFα-induced activation of NF-κB and HIF, without effects in stand-alone treatment. Stochastic activation patterns in cell cultures were also considerable upon challenges with several redox stimuli. INNOVATION A novel strategy was here used to study simultaneous activation of Nrf2, HIF, and NF-κB in single cells. The method can also be adapted for studies of other transcription factors. CONCLUSION The pTRAF provides new opportunities for in-depth studies of transcription factor activities. In this study, we found that upon challenges of cells with several redox-perturbing conditions, Nrf2, HIF, and NF-κB are uniquely responsive to separate stimuli, but can also display marked cross talk to each other within single cells. Antioxid. Redox Signal. 26, 229-246.
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Affiliation(s)
- Katarina Johansson
- 1 Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
| | - Marcus Cebula
- 1 Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
| | - Olle Rengby
- 1 Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
| | - Kristian Dreij
- 2 Division of Biochemical Toxicology, Institute of Environmental Medicine, Karolinska Institutet , Stockholm, Sweden
| | - Karl E Carlström
- 3 Department of Clinical Neuroscience, Karolinska Institutet , Stockholm, Sweden
| | - Kristmundur Sigmundsson
- 4 Division of Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
| | - Fredrik Piehl
- 3 Department of Clinical Neuroscience, Karolinska Institutet , Stockholm, Sweden
| | - Elias S J Arnér
- 1 Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
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Abstract
SIGNIFICANCE There are a number of redox-active anticancer agents currently in development based on the premise that altered redox homeostasis is necessary for cancer cell's survival. Recent Advances: This review focuses on the relatively few agents that target cellular redox homeostasis to have entered clinical trial as anticancer drugs. CRITICAL ISSUES The success rate of redox anticancer drugs has been disappointing compared to other classes of anticancer agents. This is due, in part, to our incomplete understanding of the functions of the redox targets in normal and cancer tissues, leading to off-target toxicities and low therapeutic indexes of the drugs. The field also lags behind in the use biomarkers and other means to select patients who are most likely to respond to redox-targeted therapy. FUTURE DIRECTIONS If we wish to derive clinical benefit from agents that attack redox targets, then the future will require a more sophisticated understanding of the role of redox targets in cancer and the increased application of personalized medicine principles for their use. Antioxid. Redox Signal. 26, 262-273.
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Affiliation(s)
| | - Garth Powis
- 2 Sanford Burnham Prebys Medical Discovery Institute Cancer Center , La Jolla, California
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229
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Kim E, Winkler TE, Kitchen C, Kang M, Banis G, Bentley WE, Kelly DL, Ghodssi R, Payne GF. Redox Probing for Chemical Information of Oxidative Stress. Anal Chem 2017; 89:1583-1592. [PMID: 28035805 PMCID: PMC5300039 DOI: 10.1021/acs.analchem.6b03620] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 12/29/2016] [Indexed: 02/07/2023]
Abstract
Oxidative stress is implicated in many diseases yet no simple, rapid, and robust measurement is available at the point-of-care to assist clinicians in detecting oxidative stress. Here, we report results from a discovery-based research approach in which a redox mediator is used to probe serum samples for chemical information relevant to oxidative stress. Specifically, we use an iridium salt (K2IrCl6) to probe serum for reducing activities that can transfer electrons to iridium and thus generate detectable optical and electrochemical signals. We show that this Ir-reducing assay can detect various biological reductants and is especially sensitive to glutathione (GSH) compared to alternative assays. We performed an initial clinical evaluation using serum from 10 people diagnosed with schizophrenia, a mental health disorder that is increasingly linked to oxidative stress. The measured Ir-reducing capacity was able to discriminate people with schizophrenia from healthy controls (p < 0.005), and correlations were observed between Ir-reducing capacity and independent measures of symptom severity.
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Affiliation(s)
- Eunkyoung Kim
- Institute
for Bioscience and Biotechnology Research, University of Maryland, College
Park, Maryland 20742, United States
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
| | - Thomas E. Winkler
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
- MEMS
Sensors and Actuators Laboratory (MSAL), University of Maryland, College
Park, Maryland 20742, United States
| | - Christopher Kitchen
- Maryland
Psychiatric Research Center, University
of Maryland School of Medicine, Baltimore, Maryland 21228, United States
| | - Mijeong Kang
- Institute
for Bioscience and Biotechnology Research, University of Maryland, College
Park, Maryland 20742, United States
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
| | - George Banis
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
- MEMS
Sensors and Actuators Laboratory (MSAL), University of Maryland, College
Park, Maryland 20742, United States
| | - William E. Bentley
- Institute
for Bioscience and Biotechnology Research, University of Maryland, College
Park, Maryland 20742, United States
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
| | - Deanna L. Kelly
- Maryland
Psychiatric Research Center, University
of Maryland School of Medicine, Baltimore, Maryland 21228, United States
| | - Reza Ghodssi
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
- MEMS
Sensors and Actuators Laboratory (MSAL), University of Maryland, College
Park, Maryland 20742, United States
- Department
of Electrical and Computer Engineering, Institute for Systems Research, University of Maryland, College Park, Maryland 20742, United States
| | - Gregory F. Payne
- Institute
for Bioscience and Biotechnology Research, University of Maryland, College
Park, Maryland 20742, United States
- Fischell
Department of Bioengineering, University
of Maryland, College Park, Maryland 20742, United States
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230
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Muscarella LA, Fazio VM. Keap1/Nrf2 impairing revised: are we missing the single nucleotide polymorphisms? J Thorac Dis 2016; 8:E1752-E1754. [PMID: 28149633 DOI: 10.21037/jtd.2016.12.85] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Lucia Anna Muscarella
- Laboratory of Oncology, IRCCS "Casa Sollievo della Sofferenza", San Giovanni Rotondo (FG), Italy
| | - Vito Michele Fazio
- Laboratory of Oncology, IRCCS "Casa Sollievo della Sofferenza", San Giovanni Rotondo (FG), Italy; ; Genetic and Clinical Pathology Unit, University Campus Bio-Medico of Rome, Roma, Italy
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231
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Smith RE, Tran K, Smith CC, McDonald M, Shejwalkar P, Hara K. The Role of the Nrf2/ARE Antioxidant System in Preventing Cardiovascular Diseases. Diseases 2016; 4:diseases4040034. [PMID: 28933413 PMCID: PMC5456329 DOI: 10.3390/diseases4040034] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/04/2016] [Accepted: 11/07/2016] [Indexed: 12/21/2022] Open
Abstract
It is widely believed that consuming foods and beverages that have high concentrations of antioxidants can prevent cardiovascular diseases and many types of cancer. As a result, many articles have been published that give the total antioxidant capacities of foods in vitro. However, many antioxidants behave quite differently in vivo. Some of them, such as resveratrol (in red wine) and epigallocatechin gallate or EGCG (in green tea) can activate the nuclear erythroid-2 like factor-2 (Nrf2) transcription factor. It is a master regulator of endogenous cellular defense mechanisms. Nrf2 controls the expression of many antioxidant and detoxification genes, by binding to antioxidant response elements (AREs) that are commonly found in the promoter region of antioxidant (and other) genes, and that control expression of those genes. The mechanisms by which Nrf2 relieves oxidative stress and limits cardiac injury as well as the progression to heart failure are described. Also, the ability of statins to induce Nrf2 in the heart, brain, lung, and liver is mentioned. However, there is a negative side of Nrf2. When over-activated, it can cause (not prevent) cardiovascular diseases and multi-drug resistance cancer.
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Affiliation(s)
- Robert E Smith
- US Food & Drug Administration, 11510 W 80th Street, Lenexa, KS 66214, USA.
| | - Kevin Tran
- US Food & Drug Administration, 11510 W 80th Street, Lenexa, KS 66214, USA.
| | - Cynthia C Smith
- US Food & Drug Administration, 11510 W 80th Street, Lenexa, KS 66214, USA.
| | - Miranda McDonald
- US Food & Drug Administration, 11510 W 80th Street, Lenexa, KS 66214, USA.
| | - Pushkar Shejwalkar
- Department of Applied Chemistry, School of Engineering, Tokyo University of Technology, 1404-1 Katakuramachi, Hachioji, Tokyo 192-0982, Japan.
| | - Kenji Hara
- Department of Applied Chemistry, School of Engineering, Tokyo University of Technology, 1404-1 Katakuramachi, Hachioji, Tokyo 192-0982, Japan.
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232
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Ahmed SMU, Luo L, Namani A, Wang XJ, Tang X. Nrf2 signaling pathway: Pivotal roles in inflammation. Biochim Biophys Acta Mol Basis Dis 2016; 1863:585-597. [PMID: 27825853 DOI: 10.1016/j.bbadis.2016.11.005] [Citation(s) in RCA: 1129] [Impact Index Per Article: 141.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Revised: 09/30/2016] [Accepted: 11/02/2016] [Indexed: 12/13/2022]
Abstract
Inflammation is the most common feature of many chronic diseases and complications, while playing critical roles in carcinogenesis. Several studies have demonstrated that Nrf2 contributes to the anti-inflammatory process by orchestrating the recruitment of inflammatory cells and regulating gene expression through the antioxidant response element (ARE). The Keap1 (Kelch-like ECH-associated protein)/Nrf2 (NF-E2 p45-related factor 2)/ARE signaling pathway mainly regulates anti-inflammatory gene expression and inhibits the progression of inflammation. Therefore, the identification of new Nrf2-dependent anti-inflammatory phytochemicals has become a key point in drug discovery. In this review, we discuss the members of the Keap1/Nrf2/ARE signal pathway and its downstream genes, the effects of this pathway on animal models of inflammatory diseases, and crosstalk with the NF-κB pathway. In addition we also discuss about the regulation of NLRP3 inflammasome by Nrf2. Besides this, we summarize the current scenario of the development of anti-inflammatory phytochemicals and others that mediate the Nrf2/ARE signaling pathway.
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Affiliation(s)
- Syed Minhaj Uddin Ahmed
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, PR China
| | - Lin Luo
- Department of Pharmacology, School of Medicine, Zhejiang University, Hangzhou 310058, PR China; School of Pharmacy, Nantong University, Nantong 226001, PR China
| | - Akhileshwar Namani
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, PR China
| | - Xiu Jun Wang
- Department of Pharmacology, School of Medicine, Zhejiang University, Hangzhou 310058, PR China
| | - Xiuwen Tang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, PR China.
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233
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Lin J. Stress responses of Acinetobacter strain Y during phenol degradation. Arch Microbiol 2016; 199:365-375. [DOI: 10.1007/s00203-016-1310-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 08/10/2016] [Accepted: 10/17/2016] [Indexed: 12/14/2022]
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234
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Brigelius-Flohé R. Mixed results with mixed disulfides. Arch Biochem Biophys 2016; 595:81-7. [PMID: 27095221 DOI: 10.1016/j.abb.2015.11.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 06/03/2015] [Accepted: 10/19/2015] [Indexed: 12/17/2022]
Abstract
A period of research with Helmut Sies in the 1980s is recalled. Our experiments aimed at an in-depth understanding of metabolic changes due to oxidative challenges under near-physiological conditions, i.e. perfused organs. A major focus were alterations of the glutathione and the NADPH/NADP(+) system by different kinds of oxidants, in particular formation of glutathione mixed disulfides with proteins. To analyze mixed disulfides, a test was adapted which is widely used until today. The observations in perfused rat livers let us believe that glutathione-6-phosphate dehydrogenase (G6PDH), i.a. might be activated by glutathionylation. Although we did not succeed to verify this hypothesis for the special case of G6PDH, the regulation of enzyme/protein activities by glutathionylation today is an accepted posttranslational mechanism in redox biology in general. Our early experimental approaches are discussed in the context of present knowledge.
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Affiliation(s)
- Regina Brigelius-Flohé
- German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany.
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235
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Fujii S, Sawa T, Nishida M, Ihara H, Ida T, Motohashi H, Akaike T. Redox signaling regulated by an electrophilic cyclic nucleotide and reactive cysteine persulfides. Arch Biochem Biophys 2016; 595:140-6. [PMID: 27095231 DOI: 10.1016/j.abb.2015.11.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/17/2015] [Indexed: 02/06/2023]
Abstract
Reactive oxygen (oxidant) and free radical species are known to cause nonspecific damage of various biological molecules. The oxidant toxicology is developing an emerging concept of the physiological functions of reactive oxygen species in cell signaling regulation. Redox signaling is precisely modulated by endogenous electrophilic substances that are generated from reactive oxygen species during cellular oxidative stress responses. Among diverse electrophilic molecular species that are endogenously generated, 8-nitroguanosine 3',5'-cyclic monophosphate (8-nitro-cGMP) is a unique second messenger whose formation, signaling, and metabolism in cells was recently clarified. Most important, our current studies revealed that reactive cysteine persulfides that are formed abundantly in cells are critically involved in the metabolism of 8-nitro-cGMP. Modern redox biology involves frontiers of cell research and stem cell research; medical and clinical investigations of infections, cancer, metabolic syndrome, aging, and neurodegenerative diseases; and other fields. 8-Nitro-cGMP-mediated signaling and metabolism in cells may therefore be potential targets for drug development, which may lead to discovery of new therapeutic agents for many diseases.
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Affiliation(s)
- Shigemoto Fujii
- Department of Environmental Health Sciences and Molecular Toxicology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | - Tomohiro Sawa
- Department of Microbiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Motohiro Nishida
- Division of Cardiocirculatory Signaling, Okazaki Institute for Integrative Bioscience (National Institute for Physiological Sciences), National Institutes of Natural Sciences, Aichi 444-8787, Japan; Department of Translational Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan; PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Hideshi Ihara
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Osaka 599-8531, Japan
| | - Tomoaki Ida
- Department of Environmental Health Sciences and Molecular Toxicology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | - Hozumi Motohashi
- Department of Gene Expression Regulation, Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-8575, Japan
| | - Takaaki Akaike
- Department of Environmental Health Sciences and Molecular Toxicology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan.
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236
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Niki E. Oxidative stress and antioxidants: Distress or eustress? Arch Biochem Biophys 2016; 595:19-24. [PMID: 27095209 DOI: 10.1016/j.abb.2015.11.017] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 10/14/2015] [Accepted: 10/14/2015] [Indexed: 01/06/2023]
Abstract
There is a growing consensus that reactive oxygen species (ROS) are not just associated with various pathologies, but that they act as physiological redox signaling messenger with important regulatory functions. It is sometimes stated that "if ROS is a physiological signaling messenger, then removal of ROS by antioxidants such as vitamins E and C may not be good for human health." However, it should be noted that ROS acting as physiological signaling messenger and ROS removed by antioxidants are not the same. The lipid peroxidation products of polyunsaturated fatty acids and cholesterol induce adaptive response and enhance defense capacity against subsequent oxidative insults, but it is unlikely that these lipid peroxidation products are physiological signaling messenger produced on purpose. The removal of ROS and inhibition of lipid peroxidation by antioxidants should be beneficial for human health, although it has to be noted also that they may not be an effective inhibitor of oxidative damage mediated by non-radical oxidants. The term ROS is vague and, as there are many ROS and antioxidants which are different in chemistry, it is imperative to explicitly specify ROS and antioxidant to understand the effects and role of oxidative stress and antioxidants properly.
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Affiliation(s)
- Etsuo Niki
- Health Research Institute, National Institute of Advanced Industrial Science & Technology, Takamatsu 761-0395, Japan; Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan.
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237
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Margaritelis NV, Cobley JN, Paschalis V, Veskoukis AS, Theodorou AA, Kyparos A, Nikolaidis MG. Going retro: Oxidative stress biomarkers in modern redox biology. Free Radic Biol Med 2016; 98:2-12. [PMID: 26855421 DOI: 10.1016/j.freeradbiomed.2016.02.005] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/08/2016] [Accepted: 02/02/2016] [Indexed: 12/23/2022]
Abstract
The field of redox biology is inherently intertwined with oxidative stress biomarkers. Oxidative stress biomarkers have been utilized for many different objectives. Our analysis indicates that oxidative stress biomarkers have several salient applications: (1) diagnosing oxidative stress, (2) pinpointing likely redox components in a physiological or pathological process and (3) estimating the severity, progression and/or regression of a disease. On the contrary, oxidative stress biomarkers do not report on redox signaling. Alternative approaches to gain more mechanistic insights are: (1) measuring molecules that are integrated in pathways linking redox biochemistry with physiology, (2) using the exomarker approach and (3) exploiting -omics techniques. More sophisticated approaches and large trials are needed to establish oxidative stress biomarkers in the clinical setting.
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Affiliation(s)
- N V Margaritelis
- Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Agios Ioannis, 62110 Serres, Greece; Intensive Care Unit, 424 General Military Hospital of Thessaloniki, Thessaloniki, Greece
| | - J N Cobley
- Division of Sport and Exercise Sciences, Abertay University, Dundee, UK
| | - V Paschalis
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, Greece; Department of Health Sciences, School of Sciences, European University Cyprus, Nicosia, Cyprus
| | - A S Veskoukis
- Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Agios Ioannis, 62110 Serres, Greece
| | - A A Theodorou
- Department of Health Sciences, School of Sciences, European University Cyprus, Nicosia, Cyprus
| | - A Kyparos
- Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Agios Ioannis, 62110 Serres, Greece
| | - M G Nikolaidis
- Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Agios Ioannis, 62110 Serres, Greece.
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238
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Stepovaya EA, Shakhristova EV, Ryazantseva NV, Nosareva OL, Yakushina VD, Nosova AI, Gulaya VS, Stepanova EA, Chil’chigashev RI, Novitsky VV. The role of oxidative protein modification and the glutathione system in modulation of the redox status of breast epithelial cells. BIOCHEMISTRY (MOSCOW) SUPPLEMENT SERIES B: BIOMEDICAL CHEMISTRY 2016. [DOI: 10.1134/s1990750816030161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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239
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Diaz-Aguirre V, Velez-Pardo C, Jimenez-Del-Rio M. Fructose sensitizes Jurkat cells oxidative stress-induced apoptosis via caspase-dependent and caspase-independent mechanisms. Cell Biol Int 2016; 40:1162-1173. [DOI: 10.1002/cbin.10653] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 07/31/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Viviana Diaz-Aguirre
- Neuroscience Research Group; Faculty of Medicine; Medical Research Institute; University of Antioquia (UdeA); Calle 70 No. 52-21 and Calle 62 # 52-59, Building 1, Room 412 SIU Medellin Colombia
| | - Carlos Velez-Pardo
- Neuroscience Research Group; Faculty of Medicine; Medical Research Institute; University of Antioquia (UdeA); Calle 70 No. 52-21 and Calle 62 # 52-59, Building 1, Room 412 SIU Medellin Colombia
| | - Marlene Jimenez-Del-Rio
- Neuroscience Research Group; Faculty of Medicine; Medical Research Institute; University of Antioquia (UdeA); Calle 70 No. 52-21 and Calle 62 # 52-59, Building 1, Room 412 SIU Medellin Colombia
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240
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Grottelli S, Ferrari I, Pietrini G, Peirce MJ, Minelli A, Bellezza I. The Role of Cyclo(His-Pro) in Neurodegeneration. Int J Mol Sci 2016; 17:E1332. [PMID: 27529240 PMCID: PMC5000729 DOI: 10.3390/ijms17081332] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 08/04/2016] [Accepted: 08/08/2016] [Indexed: 02/06/2023] Open
Abstract
Neurodegenerative diseases may have distinct genetic etiologies and pathological manifestations, yet share common cellular mechanisms underpinning neuronal damage and dysfunction. These cellular mechanisms include excitotoxicity, calcium dysregulation, oxidative damage, ER stress and neuroinflammation. Recent data have identified a dual role in these events for glial cells, such as microglia and astrocytes, which are able both to induce and to protect against damage induced by diverse stresses. Cyclo(His-Pro), a cyclic dipeptide derived from the hydrolytic removal of the amino-terminal pyroglutamic acid residue of the hypothalamic thyrotropin-releasing hormone, may be important in regulating the nature of the glial cell contribution. Cyclo(His-Pro) is ubiquitous in the central nervous system and is a key substrate of organic cation transporters, which are strongly linked to neuroprotection. The cyclic dipeptide can also cross the brain-blood-barrier and, once in the brain, can affect diverse inflammatory and stress responses by modifying the Nrf2-NF-κB signaling axis. For these reasons, cyclo(His-Pro) has striking potential for therapeutic application by both parenteral and oral administration routes and may represent an important new tool in counteracting neuroinflammation-based degenerative pathologies. In this review, we discuss the chemistry and biology of cyclo(His-Pro), how it may interact with the biological mechanisms driving neurodegenerative disease, such as amyotrophic lateral sclerosis, and thereby act to preserve or restore neuronal function.
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Affiliation(s)
- Silvia Grottelli
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy.
| | - Ilaria Ferrari
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano ed Istituto di Neuroscienze, Consiglio Nazionale delle Ricerche, Via Vanvitelli 32, 20129 Milano, Italy.
| | - Grazia Pietrini
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano ed Istituto di Neuroscienze, Consiglio Nazionale delle Ricerche, Via Vanvitelli 32, 20129 Milano, Italy.
| | - Matthew J Peirce
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy.
| | - Alba Minelli
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy.
| | - Ilaria Bellezza
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy.
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241
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Brigelius-Flohé R, Flohé L. Selenium and redox signaling. Arch Biochem Biophys 2016; 617:48-59. [PMID: 27495740 DOI: 10.1016/j.abb.2016.08.003] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Accepted: 08/01/2016] [Indexed: 01/06/2023]
Abstract
Selenium compounds that contain selenol functions or can be metabolized to selenols are toxic via superoxide and H2O2 generation, when ingested at dosages beyond requirement. At supra-nutritional dosages various forms of programmed cell death are observed. At physiological intakes, selenium exerts its function as constituent of selenoproteins, which overwhelmingly are oxidoreductases. Out of those, the glutathione peroxidases counteract hydroperoxide-stimulated signaling cascades comprising inflammation triggered by cytokines or lipid mediators, insulin signaling and different forms of programmed cell death. Similar events are exerted by peroxiredoxins, which functionally depend on the selenoproteins of the thioredoxin reductase family. The thiol peroxidases of both families can, however, also act as sensors for hydroperoxides, thereby initiating signaling cascades. Although the interaction of selenoproteins with signaling events has been established by genetic techniques, the in vivo relevance of these findings is still hard to delineate for several reasons: The biosynthesis of individual selenoproteins responds differently to variations of selenium intakes; selenium is preferentially delivered to privileged tissues via inter-organ trafficking and receptor-mediated uptake, and only half of the selenoproteins known by sequence have been functionally characterized. The fragmentary insights do not allow any uncritical use of selenium for optimizing human health.
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Affiliation(s)
| | - Leopold Flohé
- Departamento de Bioquímica, Universidad de la República, 11800 Montevideo, Uruguay; Department of Molecular Medicine, University of Padova, I-35121 Padova, Italy
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242
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Vall-Llaura N, Reverter-Branchat G, Vived C, Weertman N, Rodríguez-Colman MJ, Cabiscol E. Reversible glutathionylation of Sir2 by monothiol glutaredoxins Grx3/4 regulates stress resistance. Free Radic Biol Med 2016; 96:45-56. [PMID: 27085841 DOI: 10.1016/j.freeradbiomed.2016.04.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 03/31/2016] [Accepted: 04/01/2016] [Indexed: 12/22/2022]
Abstract
The regulatory mechanisms of yeast Sir2, the founding member of the sirtuin family involved in oxidative stress and aging, are unknown. Redox signaling controls many cellular functions, especially under stress situations, with dithiol glutaredoxins (Grxs) playing an important role. However, monothiol Grxs are not considered to have major oxidoreductase activity. The present study investigated the redox regulation of yeast Sir2, together with the role and physiological impact of monothiol Grx3/4 as Sir2 thiol-reductases upon stress. S-glutathionylation of Sir2 upon disulfide stress was demonstrated both in vitro and in vivo, and decreased Sir2 deacetylase activity. Physiological levels of nuclear Grx3/4 can reverse the observed post-translational modification. Grx3/4 interacted with Sir2 and reduced it after stress, thereby restoring telomeric silencing activity. Using site-directed mutagenesis, key cysteine residues at the catalytic domain of Sir2 were identified as a target of S-glutathionylation. Mutation of these residues resulted in cells with increased resistance to disulfide stress. We provide new mechanistic insights into Grx3/4 regulation of Sir2 by S-deglutathionylation to increase cell resistance to stress. This finding offers news perspectives on monothiol Grxs in redox signaling, describing Sir2 as a physiological substrate regulated by S-glutathionylation. These results might have a relevant role in understanding aging and age-related diseases.
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Affiliation(s)
- Núria Vall-Llaura
- Departament de Ciències Mèdiques Bàsiques, IRBLleida, Universitat de Lleida, Edifici Biomedicina I, Av. Alcalde Rovira Roure, 80, 25198 Lleida, Catalonia, Spain
| | - Gemma Reverter-Branchat
- Departament de Ciències Mèdiques Bàsiques, IRBLleida, Universitat de Lleida, Edifici Biomedicina I, Av. Alcalde Rovira Roure, 80, 25198 Lleida, Catalonia, Spain
| | - Celia Vived
- Departament de Ciències Mèdiques Bàsiques, IRBLleida, Universitat de Lleida, Edifici Biomedicina I, Av. Alcalde Rovira Roure, 80, 25198 Lleida, Catalonia, Spain
| | - Naomi Weertman
- Departament de Ciències Mèdiques Bàsiques, IRBLleida, Universitat de Lleida, Edifici Biomedicina I, Av. Alcalde Rovira Roure, 80, 25198 Lleida, Catalonia, Spain
| | - María José Rodríguez-Colman
- Departament de Ciències Mèdiques Bàsiques, IRBLleida, Universitat de Lleida, Edifici Biomedicina I, Av. Alcalde Rovira Roure, 80, 25198 Lleida, Catalonia, Spain
| | - Elisa Cabiscol
- Departament de Ciències Mèdiques Bàsiques, IRBLleida, Universitat de Lleida, Edifici Biomedicina I, Av. Alcalde Rovira Roure, 80, 25198 Lleida, Catalonia, Spain.
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243
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Di Nunzio M, Valli V, Bordoni A. PUFA and oxidative stress. Differential modulation of the cell response by DHA. Int J Food Sci Nutr 2016; 67:834-43. [PMID: 27353954 DOI: 10.1080/09637486.2016.1201790] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Although an increased dietary intake of long-chain n-3 PUFA is considered an effective preventive strategy, a theoretical concern related to the possible increase of lipid peroxidation induced by a PUFA-rich diet still remains a problem. In this study, the effects of different PUFA (linoleic, α-linolenic, arachidonic, eicosapentaenoic and docosahexaenoic acid) on cytotoxicity, lipid oxidation, and modulation of antioxidant defenses were evaluated in HepG2 cells submitted to an oxidative stress (H2O2). Results clearly evidenced that all supplemented PUFA, but DHA, enhanced cell susceptibility to H2O2. Overall, our results underline that PUFA cannot be considered as a single category but as individual compounds, and research on mechanisms of action and preventive effects should deal with the individual fatty acids, particularly in the case of DHA.
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Affiliation(s)
- Mattia Di Nunzio
- a Interdepartmental Centre for Industrial Agri-Food Research , University of Bologna , Cesena (FC), Italy
| | - Veronica Valli
- b Department of Agri-Food Science and Technology , University of Bologna , Cesena (FC), Italy
| | - Alessandra Bordoni
- a Interdepartmental Centre for Industrial Agri-Food Research , University of Bologna , Cesena (FC), Italy ;,b Department of Agri-Food Science and Technology , University of Bologna , Cesena (FC), Italy
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244
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Lepka K, Berndt C, Hartung HP, Aktas O. Redox Events As Modulators of Pathology and Therapy of Neuroinflammatory Diseases. Front Cell Dev Biol 2016; 4:63. [PMID: 27446915 PMCID: PMC4917551 DOI: 10.3389/fcell.2016.00063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 06/08/2016] [Indexed: 01/14/2023] Open
Affiliation(s)
- Klaudia Lepka
- Department of Neurology, Medical Faculty, Heinrich-Heine University Düsseldorf Düsseldorf, Germany
| | - Carsten Berndt
- Department of Neurology, Medical Faculty, Heinrich-Heine University Düsseldorf Düsseldorf, Germany
| | - Hans-Peter Hartung
- Department of Neurology, Medical Faculty, Heinrich-Heine University Düsseldorf Düsseldorf, Germany
| | - Orhan Aktas
- Department of Neurology, Medical Faculty, Heinrich-Heine University Düsseldorf Düsseldorf, Germany
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245
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Michiels C, Tellier C, Feron O. Cycling hypoxia: A key feature of the tumor microenvironment. Biochim Biophys Acta Rev Cancer 2016; 1866:76-86. [PMID: 27343712 DOI: 10.1016/j.bbcan.2016.06.004] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 06/18/2016] [Accepted: 06/21/2016] [Indexed: 01/06/2023]
Abstract
A compelling body of evidence indicates that most human solid tumors contain hypoxic areas. Hypoxia is the consequence not only of the chaotic proliferation of cancer cells that places them at distance from the nearest capillary but also of the abnormal structure of the new vasculature network resulting in transient blood flow. Hence two types of hypoxia are observed in tumors: chronic and cycling (intermittent) hypoxia. Most of the current work aims at understanding the role of chronic hypoxia in tumor growth, response to treatment and metastasis. Only recently, cycling hypoxia, with spatial and temporal fluctuations in oxygen levels, has emerged as another key feature of the tumor environment that triggers different responses in comparison to chronic hypoxia. Either type of hypoxia is associated with distinct effects not only in cancer cells but also in stromal cells. In particular, cycling hypoxia has been demonstrated to favor, to a higher extent than chronic hypoxia, angiogenesis, resistance to anti-cancer treatments, intratumoral inflammation and tumor metastasis. These review details these effects as well as the signaling pathway it triggers to switch on specific transcriptomic programs. Understanding the signaling pathways through which cycling hypoxia induces these processes that support the development of an aggressive cancer could convey to the emergence of promising new cancer treatments.
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Affiliation(s)
- Carine Michiels
- URBC-NARILIS, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium.
| | - Céline Tellier
- URBC-NARILIS, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium
| | - Olivier Feron
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Expérimentale et Clinique (IREC), Université catholique de Louvain, 53 Avenue Mounier, B1.53.09, B-1200 Brussels, Belgium.
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246
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Evolution of Microbial Quorum Sensing to Human Global Quorum Sensing: An Insight into How Gap Junctional Intercellular Communication Might Be Linked to the Global Metabolic Disease Crisis. BIOLOGY 2016; 5:biology5020029. [PMID: 27314399 PMCID: PMC4929543 DOI: 10.3390/biology5020029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/25/2016] [Accepted: 06/03/2016] [Indexed: 12/21/2022]
Abstract
The first anaerobic organism extracted energy for survival and reproduction from its source of nutrients, with the genetic means to ensure protection of its individual genome but also its species survival. While it had a means to communicate with its community via simple secreted molecules (“quorum sensing”), the eventual shift to an aerobic environment led to multi-cellular metazoan organisms, with evolutionary-selected genes to form extracellular matrices, stem cells, stem cell niches, and a family of gap junction or “connexin” genes. These germinal and somatic stem cells responded to extracellular signals that triggered intra-cellular signaling to regulate specific genes out of the total genome. These extra-cellular induced intra-cellular signals also modulated gap junctional intercellular communication (GJIC) in order to regulate the new cellular functions of symmetrical and asymmetrical cell division, cell differentiation, modes of cell death, and senescence. Within the hierarchical and cybernetic concepts, differentiated by neurons organized in the brain of the Homo sapiens, the conscious mind led to language, abstract ideas, technology, myth-making, scientific reasoning, and moral decision–making, i.e., the creation of culture. Over thousands of years, this has created the current collision between biological and cultural evolution, leading to the global “metabolic disease” crisis.
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247
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An inhibitor of the Keap1-Nrf2 protein-protein interaction protects NCM460 colonic cells and alleviates experimental colitis. Sci Rep 2016; 6:26585. [PMID: 27215610 PMCID: PMC4877580 DOI: 10.1038/srep26585] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 05/04/2016] [Indexed: 02/06/2023] Open
Abstract
Ulcerative colitis (UC) is a chronic relapsing-remitting form of inflammatory bowel disease (IBD) that increases the risk of colorectal cancer, the third most common malignancy in humans. Oxidative stress is a risk factor for the development of UC. The Keap1-Nrf2-ARE pathway is one of the most important defensive mechanisms against oxidative and/or electrophilic stresses. In this study, we identified CPUY192018 as a potent small-molecule inhibitor of the Keap1-Nrf2 PPI, investigated the cyto-protective effects of CPUY192018 on the NCM460 colonic cells and evaluated whether treatment with the inhibitor of the Keap1-Nrf2 PPI exerts protection on an established experimental model of UC induced by dextran sodium sulfate (DSS). Our study clearly demonstrated that CPUY192018 had a cytoprotective effect against DSS in both NCM460 cells and mouse colon via the activation of Nrf2 signaling. These results suggested that activation of Nrf2 by directly inhibiting the Keap1-Nrf2 PPI may be beneficial as a treatment for UC.
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248
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Gu SX, Blokhin IO, Wilson KM, Dhanesha N, Doddapattar P, Grumbach IM, Chauhan AK, Lentz SR. Protein methionine oxidation augments reperfusion injury in acute ischemic stroke. JCI Insight 2016; 1:e86460. [PMID: 27294204 PMCID: PMC4902298 DOI: 10.1172/jci.insight.86460] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 04/19/2016] [Indexed: 12/20/2022] Open
Abstract
Reperfusion injury can exacerbate tissue damage in ischemic stroke, but little is known about the mechanisms linking ROS to stroke severity. Here, we tested the hypothesis that protein methionine oxidation potentiates NF-κB activation and contributes to cerebral ischemia/reperfusion injury. We found that overexpression of methionine sulfoxide reductase A (MsrA), an antioxidant enzyme that reverses protein methionine oxidation, attenuated ROS-augmented NF-κB activation in endothelial cells, in part, by protecting against the oxidation of methionine residues in the regulatory domain of calcium/calmodulin-dependent protein kinase II (CaMKII). In a murine model, MsrA deficiency resulted in increased NF-κB activation and neutrophil infiltration, larger infarct volumes, and more severe neurological impairment after transient cerebral ischemia/reperfusion injury. This phenotype was prevented by inhibition of NF-κB or CaMKII. MsrA-deficient mice also exhibited enhanced leukocyte rolling and upregulation of E-selectin, an endothelial NF-κB-dependent adhesion molecule known to contribute to neurovascular inflammation in ischemic stroke. Finally, bone marrow transplantation experiments demonstrated that the neuroprotective effect was mediated by MsrA expressed in nonhematopoietic cells. These findings suggest that protein methionine oxidation in nonmyeloid cells is a key mechanism of postischemic oxidative injury mediated by NF-κB activation, leading to neutrophil recruitment and neurovascular inflammation in acute ischemic stroke.
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249
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Park MH, Jo M, Kim YR, Lee CK, Hong JT. Roles of peroxiredoxins in cancer, neurodegenerative diseases and inflammatory diseases. Pharmacol Ther 2016; 163:1-23. [PMID: 27130805 PMCID: PMC7112520 DOI: 10.1016/j.pharmthera.2016.03.018] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 03/22/2016] [Indexed: 12/29/2022]
Abstract
Peroxiredoxins (PRDXs) are antioxidant enzymes, known to catalyze peroxide reduction to balance cellular hydrogen peroxide (H2O2) levels, which are essential for cell signaling and metabolism and act as a regulator of redox signaling. Redox signaling is a critical component of cell signaling pathways that are involved in the regulation of cell growth, metabolism, hormone signaling, immune regulation and variety of other physiological functions. Early studies demonstrated that PRDXs regulates cell growth, metabolism and immune regulation and therefore involved in the pathologic regulator or protectant of several cancers, neurodegenerative diseases and inflammatory diseases. Oxidative stress and antioxidant systems are important regulators of redox signaling regulated diseases. In addition, thiol-based redox systems through peroxiredoxins have been demonstrated to regulate several redox-dependent process related diseases. In this review article, we will discuss recent findings regarding PRDXs in the development of diseases and further discuss therapeutic approaches targeting PRDXs. Moreover, we will suggest that PRDXs could be targets of several diseases and the therapeutic agents for targeting PRDXs may have potential beneficial effects for the treatment of cancers, neurodegenerative diseases and inflammatory diseases. Future research should open new avenues for the design of novel therapeutic approaches targeting PRDXs.
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Affiliation(s)
- Mi Hee Park
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongwon-gun, Chungbuk, Republic of Korea, 361-951
| | - MiRan Jo
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongwon-gun, Chungbuk, Republic of Korea, 361-951
| | - Yu Ri Kim
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongwon-gun, Chungbuk, Republic of Korea, 361-951
| | - Chong-Kil Lee
- College of Pharmacy and Medical Research Center, Chungbuk National University, 12 Gaesin-dong, Heungduk-gu, Cheongju, Chungbuk 361-763, Republic of Korea
| | - Jin Tae Hong
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongwon-gun, Chungbuk, Republic of Korea, 361-951.
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250
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Gouge J, Satia K, Guthertz N, Widya M, Thompson AJ, Cousin P, Dergai O, Hernandez N, Vannini A. Redox Signaling by the RNA Polymerase III TFIIB-Related Factor Brf2. Cell 2016; 163:1375-87. [PMID: 26638071 PMCID: PMC4671959 DOI: 10.1016/j.cell.2015.11.005] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 10/14/2015] [Accepted: 10/23/2015] [Indexed: 01/06/2023]
Abstract
TFIIB-related factor 2 (Brf2) is a member of the family of TFIIB-like core transcription factors. Brf2 recruits RNA polymerase (Pol) III to type III gene-external promoters, including the U6 spliceosomal RNA and selenocysteine tRNA genes. Found only in vertebrates, Brf2 has been linked to tumorigenesis but the underlying mechanisms remain elusive. We have solved crystal structures of a human Brf2-TBP complex bound to natural promoters, obtaining a detailed view of the molecular interactions occurring at Brf2-dependent Pol III promoters and highlighting the general structural and functional conservation of human Pol II and Pol III pre-initiation complexes. Surprisingly, our structural and functional studies unravel a Brf2 redox-sensing module capable of specifically regulating Pol III transcriptional output in living cells. Furthermore, we establish Brf2 as a central redox-sensing transcription factor involved in the oxidative stress pathway and provide a mechanistic model for Brf2 genetic activation in lung and breast cancer. Architectural conservation of TFIIB and TFIIB-related factors Brf2 is a redox-sensing RNA polymerase III core transcription factor Brf2 regulates cellular responses to oxidative stress Brf2 amplification enables cancer cells to evade oxidative stress-induced apoptosis
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Affiliation(s)
- Jerome Gouge
- Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, UK
| | - Karishma Satia
- Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, UK
| | - Nicolas Guthertz
- Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, UK
| | - Marcella Widya
- Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, UK
| | - Andrew James Thompson
- Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, UK
| | - Pascal Cousin
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland
| | - Oleksandr Dergai
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland
| | - Nouria Hernandez
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland
| | - Alessandro Vannini
- Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, UK.
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