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Cabello MC, Chen G, Melville MJ, Osman R, Kumar GD, Domaille DW, Lippert AR. Ex Tenebris Lux: Illuminating Reactive Oxygen and Nitrogen Species with Small Molecule Probes. Chem Rev 2024. [PMID: 39137397 DOI: 10.1021/acs.chemrev.3c00892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Reactive oxygen and nitrogen species are small reactive molecules derived from elements in the air─oxygen and nitrogen. They are produced in biological systems to mediate fundamental aspects of cellular signaling but must be very tightly balanced to prevent indiscriminate damage to biological molecules. Small molecule probes can transmute the specific nature of each reactive oxygen and nitrogen species into an observable luminescent signal (or even an acoustic wave) to offer sensitive and selective imaging in living cells and whole animals. This review focuses specifically on small molecule probes for superoxide, hydrogen peroxide, hypochlorite, nitric oxide, and peroxynitrite that provide a luminescent or photoacoustic signal. Important background information on general photophysical phenomena, common probe designs, mechanisms, and imaging modalities will be provided, and then, probes for each analyte will be thoroughly evaluated. A discussion of the successes of the field will be presented, followed by recommendations for improvement and a future outlook of emerging trends. Our objectives are to provide an informative, useful, and thorough field guide to small molecule probes for reactive oxygen and nitrogen species as well as important context to compare the ecosystem of chemistries and molecular scaffolds that has manifested within the field.
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Affiliation(s)
- Maidileyvis C Cabello
- Department of Chemistry, Southern Methodist University, Dallas, Texas 75275-0314, United States
| | - Gen Chen
- Department of Chemistry, Southern Methodist University, Dallas, Texas 75275-0314, United States
| | - Michael J Melville
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Rokia Osman
- Department of Chemistry, Southern Methodist University, Dallas, Texas 75275-0314, United States
| | - G Dinesh Kumar
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Dylan W Domaille
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Alexander R Lippert
- Department of Chemistry, Southern Methodist University, Dallas, Texas 75275-0314, United States
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Ivanović SR, Borozan N, Miladinović DĆ, Živković I, Borozan S. The relationship between the cholinergic mechanism of toxicity and oxidative stress in rats during subacute diazinon poisoning. Toxicol Appl Pharmacol 2023; 473:116598. [PMID: 37331382 DOI: 10.1016/j.taap.2023.116598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 05/30/2023] [Accepted: 06/10/2023] [Indexed: 06/20/2023]
Abstract
Diazinon is an organophosphate pesticide (OP) that has significant potential for accidental and intentional poisoning of wildlife, domestic animals and humans. The aim of the study is to investigate the correlation between cholinesterase activity and oxidative stress parameters in liver and diaphragm by continuous monitoring as a function of time during prolonged use of diazinon. Wistar rats were treated orally with diazinon (55 mg/kg/day): 7, 14, 21 and 28 days. At the end of each period, blood, liver and diaphragm were collected to examine cholinesterase activity and enzymatic/non-enzymatic oxidative stress parameters: superoxide dismutase 1 (SOD1), catalase (CAT), thiobarbituric acid substances (TBARS), protein carbonyl groups. In all four time periods, there was a significant change in acetylcholinesterase (AChE) in erythrocytes and butyrylcholinesterase (BuChE) in blood plasma, CAT in liver and diaphragm and SOD1 in diaphragm. Parameters significantly altered during the cholinergic crisis included: cholinesterases and TBARS in liver and diaphragm and partially SOD1 in liver. Protein carbonyl groups in liver and diaphragm were significantly altered outside the cholinergic crisis. In the liver, there was a very strong negative correlation between BuChE and TBARS in all four time periods and BuChE and CAT on day 7. In the diaphragm, a very strong negative correlation was found between AChE and TBARS at days 7 and 14, and a very strong positive correlation between AChE and SOD1 at days 14, 21 and 28. A better understanding of the relationship between cholinergic overstimulation and oxidative stress may help to better assess health status in prolonged OPs intoxication.
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Affiliation(s)
- Saša R Ivanović
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Belgrade, Serbia.
| | | | | | - Irena Živković
- Institute of Virology, Vaccines and Sera "Torlak", Belgrade, Serbia.
| | - Sunčica Borozan
- Department of Chemistry, Faculty of Veterinary Medicine, University of Belgrade, Serbia.
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Hao Y, Li Z, Ding N, Tang X, Zhang C. A new near-infrared fluorescence probe synthesized from IR-783 for detection and bioimaging of hydrogen peroxide in vitro and in vivo. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 268:120642. [PMID: 34857465 DOI: 10.1016/j.saa.2021.120642] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 11/09/2021] [Accepted: 11/15/2021] [Indexed: 06/13/2023]
Abstract
A new near-infrared fluorescence probe was developed and synthesized for detection of hydrogen peroxide (H2O2) in vitro and in vivo. Synthesized from IR-783, the probe DBIS was designed to connect 4-(Bromomethyl)benzeneboronic acid pinacol ester as the recognizing moiety to the stable hemicyanine skeleton. Reaction of probe DBIS with H2O2 would result in the oxidation of phenylboronic acid pinacol ester, and thereby release the near-infrared fluorophore HXIS. The background signal of probe DBIS is very low, which is necessary for sensitive detection. Compared with the existing probes for detecting H2O2, the proposed probe DBIS shows excellent optical performance in vitro and in vivo, high selectivity, high sensitivity and good water solubility, as well as near-infrared fluorescence emission 708 nm, with a low detection limit of 0.12 μM. Furthermore, probe DBIS is low cytotoxic, cell membrane permeable, and its applicability has been shown to visualize endogenous H2O2 in mice. In addition, it is the first time that paper chips have been used as carrier to detect H2O2 through fluorescence signals instead of the traditional liquid phase detection mode of fluorescent probes. These superior characteristics of the probe make it have great application potential in biological systems or in vivo related research.
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Affiliation(s)
- Yitong Hao
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
| | - Zhao Li
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China.
| | - Ning Ding
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
| | - Xiaojie Tang
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
| | - Chengxiao Zhang
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China.
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Facile fabrication of GCE/Nafion/Ni composite, a robust platform to detect hydrogen peroxide in basic medium via oxidation reaction. Talanta 2022; 240:123202. [PMID: 34998141 DOI: 10.1016/j.talanta.2021.123202] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 11/03/2021] [Accepted: 12/30/2021] [Indexed: 12/29/2022]
Abstract
Nickel particles alone can oxidize hydrogen peroxide but confronts extreme stability problem which imparts a barrier to act as sensor. The porous Nafion bed on glassy carbon electrode (GCE) surface provides the sureness of incorporating of Ni particles which was further exploited as an electrochemical sensor for H2O2 detection through oxidative degradation process. The simple electrochemical incorporation of Ni particles along the pores of Nafion improves the stability of the sensor significantly. The oxidative pathway of hydrogen peroxide on GCE/Nafion/Ni was probed by analyzing mass transfer dependent linear sweep voltammograms both in static and rotating modes along with chronoamperometry. An electron transfer step determines the overall reaction rate with k°= 2.72 × 10-4 cm s-1, which is supported by the values of transfer coefficient (β) in between (0.68-0.75). Sensing performance was evaluated by recording differential pulse voltammograms (DPVs) with the linear detection limit (LOD) of 1.8 μM and linear dynamic range (LDR) of 5-500 μM. Real samples from industrial sources were successfully quantified with excellent reproducibility mark GCE/Nafion/Ni electrode as an applicable sensor.
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Bharti K, Sadhu KK. Syntheses of metal oxide-gold nanocomposites for biological applications. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100288] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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Cavalcante JDS, Nogueira Júnior FA, Bezerra Jorge RJ, Almeida C. Pain modulated by Bothrops snake venoms: Mechanisms of nociceptive signaling and therapeutic perspectives. Toxicon 2021; 201:105-114. [PMID: 34425141 DOI: 10.1016/j.toxicon.2021.08.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 08/11/2021] [Accepted: 08/16/2021] [Indexed: 12/17/2022]
Abstract
Snake venoms are substances mostly composed by proteins and peptides with high biological activity. Local and systemic effects culminate in clinical manifestations induced by these substances. Pain is the most uncomfortable condition, but it has not been well investigated. This review discusses Bothrops snakebite-induced nociception, highlighting molecules involved in the mediation of this process and perspectives in treatment of pain induced by Bothrops snake venoms (B. alternatus, B. asper, B. atrox, B. insularis, B. jararaca, B. pirajai, B. jararacussu, B. lanceolatus, B. leucurus, B. mattogrossensis, B. moojeni). We highlight, the understanding of the nociceptive signaling, especially in snakebite, enables more efficient treatment approaches. Finally, future perspectives for pain treatment concerning snakebite patients are discussed.
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Affiliation(s)
- Joeliton Dos Santos Cavalcante
- Graduate Program in Tropical Diseases, Botucatu Medical School (FMB), São Paulo State University, Botucatu, São Paulo, Brazil.
| | - Francisco Assis Nogueira Júnior
- Department of Physiology and Pharmacology and Drug Research and Development Center Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Roberta Jeane Bezerra Jorge
- Department of Physiology and Pharmacology and Drug Research and Development Center Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Cayo Almeida
- Center of Mathematics, Computing Sciences and Cognition, Federal University of ABC, São Paulo, Brazil.
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Bengtson C, Bogaerts A. The Quest to Quantify Selective and Synergistic Effects of Plasma for Cancer Treatment: Insights from Mathematical Modeling. Int J Mol Sci 2021; 22:ijms22095033. [PMID: 34068601 PMCID: PMC8126141 DOI: 10.3390/ijms22095033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 12/30/2022] Open
Abstract
Cold atmospheric plasma (CAP) and plasma-treated liquids (PTLs) have recently become a promising option for cancer treatment, but the underlying mechanisms of the anti-cancer effect are still to a large extent unknown. Although hydrogen peroxide (H2O2) has been recognized as the major anti-cancer agent of PTL and may enable selectivity in a certain concentration regime, the co-existence of nitrite can create a synergistic effect. We develop a mathematical model to describe the key species and features of the cellular response toward PTL. From the numerical solutions, we define a number of dependent variables, which represent feasible measures to quantify cell susceptibility in terms of the H2O2 membrane diffusion rate constant and the intracellular catalase concentration. For each of these dependent variables, we investigate the regimes of selective versus non-selective, and of synergistic versus non-synergistic effect to evaluate their potential role as a measure of cell susceptibility. Our results suggest that the maximal intracellular H2O2 concentration, which in the selective regime is almost four times greater for the most susceptible cells compared to the most resistant cells, could be used to quantify the cell susceptibility toward exogenous H2O2. We believe our theoretical approach brings novelty to the field of plasma oncology, and more broadly, to the field of redox biology, by proposing new ways to quantify the selective and synergistic anti-cancer effect of PTL in terms of inherent cell features.
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Mai L, Pham V, Bui Q, Nhac-Vu H. Iron sulfide nanosheets supported 3D foam: A binder-free electrocatalyst for sensitive and selective electrochemical H2O2 detection. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124942] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Kim H, Xue X. Detection of Total Reactive Oxygen Species in Adherent Cells by 2',7'-Dichlorodihydrofluorescein Diacetate Staining. J Vis Exp 2020. [PMID: 32658187 DOI: 10.3791/60682] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Oxidative stress is an important event under both physiological and pathological conditions. In this study, we demonstrate how to quantify oxidative stress by measuring total reactive oxygen species (ROS) using 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) staining in colorectal cancer cell lines as an example. This protocol describes detailed steps including preparation of DCFH-DA solution, incubation of cells with DCFH-DA solution, and measurement of normalized intensity. DCFH-DA staining is a simple and cost-effective way to detect ROS in cells. It can be used to measure ROS generation after chemical treatment or genetic modifications. Therefore, it is useful for determining cellular oxidative stress upon environment stress, providing clues to mechanistic studies.
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Affiliation(s)
- Hyeoncheol Kim
- Department of Biochemistry and Molecular Biology, University of New Mexico
| | - Xiang Xue
- Department of Biochemistry and Molecular Biology, University of New Mexico;
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Zhou L, Xie L, Liu C, Xiao Y. New trends of molecular probes based on the fluorophore 4-amino-1,8-naphthalimide. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2019.07.051] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ferraz CR, Arrahman A, Xie C, Casewell NR, Lewis RJ, Kool J, Cardoso FC. Multifunctional Toxins in Snake Venoms and Therapeutic Implications: From Pain to Hemorrhage and Necrosis. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00218] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Mori S, Morihiro K, Okuda T, Kasahara Y, Obika S. Hydrogen peroxide-triggered gene silencing in mammalian cells through boronated antisense oligonucleotides. Chem Sci 2018; 9:1112-1118. [PMID: 29629168 PMCID: PMC5875086 DOI: 10.1039/c7sc04318j] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 11/21/2017] [Indexed: 12/16/2022] Open
Abstract
Hydrogen peroxide (H2O2) is a reactive oxygen species (ROS) involved in various diseases, including neurodegeneration, diabetes, and cancer. Here, we introduce a new approach to use H2O2 to modulate specific gene expression in mammalian cells. H2O2-responsive nucleoside analogues, in which the Watson-Crick faces of the nucleobases are caged by arylboronate moieties, were synthesized. One of these analogues, boronated thymidine (dTB ), was incorporated into oligodeoxynucleotides (ODNs) using an automated DNA synthesizer. The hybridization ability of this boronated ODN to complementary RNA was clearly switched in the off-to-on direction upon H2O2 addition. Furthermore, we demonstrated H2O2-triggered gene silencing in mammalian cells using antisense oligonucleotides (ASOs) modified with dTB . Our approach can be used for the regulation of any gene of interest by the sequence design of boronated ASOs and will contribute to the development of targeted disease therapeutics.
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Affiliation(s)
- Shohei Mori
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamadaoka , Suita , Osaka 565-0871 , Japan . ;
| | - Kunihiko Morihiro
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamadaoka , Suita , Osaka 565-0871 , Japan . ;
- National Institutes of Biomedical Innovation, Health and Nutrition (NIBIOHN) , 7-6-8 Saito-Asagi , Ibaraki , Osaka 567-0085 , Japan
| | - Takumi Okuda
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamadaoka , Suita , Osaka 565-0871 , Japan . ;
| | - Yuuya Kasahara
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamadaoka , Suita , Osaka 565-0871 , Japan . ;
- National Institutes of Biomedical Innovation, Health and Nutrition (NIBIOHN) , 7-6-8 Saito-Asagi , Ibaraki , Osaka 567-0085 , Japan
| | - Satoshi Obika
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamadaoka , Suita , Osaka 565-0871 , Japan . ;
- National Institutes of Biomedical Innovation, Health and Nutrition (NIBIOHN) , 7-6-8 Saito-Asagi , Ibaraki , Osaka 567-0085 , Japan
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Zhang X, Huang B, Shen Y, Yang C, Huang Z, Huang Y, Xu X, Jiang Y, Sun X, Li X, Yan M, Zhao C. Near infrared light triggered reactive oxygen species responsive nanoparticles for chemo-photodynamic combined therapy. J Mater Chem B 2018; 6:2347-2357. [DOI: 10.1039/c8tb00308d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nanoparticles with ROS-responsive properties could realize spatial and temporal drug release under NIR irradiation and the excess ROS could be used for PDT.
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Secreted Phospholipases A₂ from Animal Venoms in Pain and Analgesia. Toxins (Basel) 2017; 9:toxins9120406. [PMID: 29311537 PMCID: PMC5744126 DOI: 10.3390/toxins9120406] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/13/2017] [Accepted: 12/16/2017] [Indexed: 12/20/2022] Open
Abstract
Animal venoms comprise a complex mixture of components that affect several biological systems. Based on the high selectivity for their molecular targets, these components are also a rich source of potential therapeutic agents. Among the main components of animal venoms are the secreted phospholipases A2 (sPLA2s). These PLA2 belong to distinct PLA2s groups. For example, snake venom sPLA2s from Elapidae and Viperidae families, the most important families when considering envenomation, belong, respectively, to the IA and IIA/IIB groups, whereas bee venom PLA2 belongs to group III of sPLA2s. It is well known that PLA2, due to its hydrolytic activity on phospholipids, takes part in many pathophysiological processes, including inflammation and pain. Therefore, secreted PLA2s obtained from animal venoms have been widely used as tools to (a) modulate inflammation and pain, uncovering molecular targets that are implicated in the control of inflammatory (including painful) and neurodegenerative diseases; (b) shed light on the pathophysiology of inflammation and pain observed in human envenomation by poisonous animals; and, (c) characterize molecular mechanisms involved in inflammatory diseases. The present review summarizes the knowledge on the nociceptive and antinociceptive actions of sPLA2s from animal venoms, particularly snake venoms.
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Grace PM, Gaudet AD, Staikopoulos V, Maier SF, Hutchinson MR, Salvemini D, Watkins LR. Nitroxidative Signaling Mechanisms in Pathological Pain. Trends Neurosci 2016; 39:862-879. [PMID: 27842920 PMCID: PMC5148691 DOI: 10.1016/j.tins.2016.10.003] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Revised: 10/18/2016] [Accepted: 10/20/2016] [Indexed: 12/14/2022]
Abstract
Tissue injury can initiate bidirectional signaling between neurons, glia, and immune cells that creates and amplifies pain. While the ability for neurotransmitters, neuropeptides, and cytokines to initiate and maintain pain has been extensively studied, recent work has identified a key role for reactive oxygen and nitrogen species (ROS/RNS; nitroxidative species), including superoxide, peroxynitrite, and hydrogen peroxide. In this review we describe how nitroxidative species are generated after tissue injury and the mechanisms by which they enhance neuroexcitability in pain pathways. Finally, we discuss potential therapeutic strategies for normalizing nitroxidative signaling, which may also enhance opioid analgesia, to help to alleviate the enormous burden of pathological pain.
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Affiliation(s)
- Peter M Grace
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA; Current address: Department of Critical Care Research, University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Andrew D Gaudet
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA
| | - Vasiliki Staikopoulos
- Discipline of Physiology, School of Medicine, and the Australian Research Council (ARC) Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, SA, Australia
| | - Steven F Maier
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA
| | - Mark R Hutchinson
- Discipline of Physiology, School of Medicine, and the Australian Research Council (ARC) Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, SA, Australia
| | - Daniela Salvemini
- Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Linda R Watkins
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA
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