1
|
Bernardo LB, Borges CVN, Buitrago PAG, Kuča K, Cavalcante SFA, Sousa RB, Lima ALS, Kitagawa DAS. Synthesis and in vitro assessment of the reactivation profile of clinically available oximes on the acetylcholinesterase model inhibited by A-230 nerve agent surrogate. Arch Toxicol 2024:10.1007/s00204-024-03821-3. [PMID: 39004640 DOI: 10.1007/s00204-024-03821-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Accepted: 07/04/2024] [Indexed: 07/16/2024]
Abstract
The risk of the use of toxic chemicals for unlawful acts has been a matter of concern for different governments and multilateral agencies. The Organisation for the Prohibition of Chemical Weapons (OPCW), which oversees the implementation of the Chemical Weapons Convention (CWC), considering recent events employing chemical warfare agents as means of assassination, has recently included in the CWC "Annex on Chemicals" some organophosphorus compounds that are regarded as acting in a similar fashion to the classical G- and V-series of nerve agents, inhibiting the pivotal enzyme acetylcholinesterase. Therefore, knowledge of the activity of the pyridinium oximes, the sole class of clinically available acetylcholinesterase reactivators to date, is plainly justified. In this paper, continuing our research efforts in medicinal chemistry on this class of toxic chemicals, we synthesized an A-230 nerve agent surrogate and applied a modified Ellman's assay to evaluate its ability to inhibit our enzymatic model, acetylcholinesterase from Electrophorus eel, and if the clinically available antidotes are able to rescue the enzyme activity for the purpose of relating the findings to the previously disclosed in silico data for the authentic nerve agent and other studies with similar A-series surrogates. Our experimental data indicates that pralidoxime is the most efficient compound for reactivating acetylcholinesterase inhibited by A-230 surrogate, which is the opposite of the in silico data previously disclosed.
Collapse
Affiliation(s)
- Leandro B Bernardo
- Instituto Militar de Engenharia (IME), Praça General Tibúrcio 80, Rio de Janeiro, RJ, 22290-270, Brazil.
- Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN), Centro Tecnológico do Exército (CTEx), Avenida das Américas 28705, Área 4, Rio de Janeiro, RJ, 23020-470, Brazil.
| | - Caio V N Borges
- Instituto Militar de Engenharia (IME), Praça General Tibúrcio 80, Rio de Janeiro, RJ, 22290-270, Brazil
- Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN), Centro Tecnológico do Exército (CTEx), Avenida das Américas 28705, Área 4, Rio de Janeiro, RJ, 23020-470, Brazil
| | - Pedro A G Buitrago
- Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN), Centro Tecnológico do Exército (CTEx), Avenida das Américas 28705, Área 4, Rio de Janeiro, RJ, 23020-470, Brazil
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 50003, Hradec Kralove, Czech Republic
| | - Samir F A Cavalcante
- Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN), Centro Tecnológico do Exército (CTEx), Avenida das Américas 28705, Área 4, Rio de Janeiro, RJ, 23020-470, Brazil
| | - Roberto B Sousa
- Instituto Militar de Engenharia (IME), Praça General Tibúrcio 80, Rio de Janeiro, RJ, 22290-270, Brazil
| | - Antônio L S Lima
- Instituto Militar de Engenharia (IME), Praça General Tibúrcio 80, Rio de Janeiro, RJ, 22290-270, Brazil.
- Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN), Centro Tecnológico do Exército (CTEx), Avenida das Américas 28705, Área 4, Rio de Janeiro, RJ, 23020-470, Brazil.
| | - Daniel A S Kitagawa
- Instituto Militar de Engenharia (IME), Praça General Tibúrcio 80, Rio de Janeiro, RJ, 22290-270, Brazil.
- Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN), Centro Tecnológico do Exército (CTEx), Avenida das Américas 28705, Área 4, Rio de Janeiro, RJ, 23020-470, Brazil.
| |
Collapse
|
2
|
Abazari R, Sanati S, Bajaber MA, Javed MS, Junk PC, Nanjundan AK, Qian J, Dubal DP. Design and Advanced Manufacturing of NU-1000 Metal-Organic Frameworks with Future Perspectives for Environmental and Renewable Energy Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2306353. [PMID: 37997226 DOI: 10.1002/smll.202306353] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 11/08/2023] [Indexed: 11/25/2023]
Abstract
Metal-organic frameworks (MOFs) represent a relatively new family of materials that attract lots of attention thanks to their unique features such as hierarchical porosity, active metal centers, versatility of linkers/metal nodes, and large surface area. Among the extended list of MOFs, Zr-based-MOFs demonstrate comparably superior chemical and thermal stabilities, making them ideal candidates for energy and environmental applications. As a Zr-MOF, NU-1000 is first synthesized at Northwestern University. A comprehensive review of various approaches to the synthesis of NU-1000 MOFs for obtaining unique surface properties (e.g., diverse surface morphologies, large surface area, and particular pore size distribution) and their applications in the catalysis (electro-, and photo-catalysis), CO2 reduction, batteries, hydrogen storage, gas storage/separation, and other environmental fields are presented. The review further outlines the current challenges in the development of NU-1000 MOFs and their derivatives in practical applications, revealing areas for future investigation.
Collapse
Affiliation(s)
- Reza Abazari
- Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran
| | - Soheila Sanati
- Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran
| | - Majed A Bajaber
- Chemistry Department, Faculty of Science, King Khalid University, Abha, 61413, Saudi Arabia
| | - Muhammad Sufyan Javed
- School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Peter C Junk
- College of Science and Engineering, James Cook University, Townsville, 4811, Australia
| | - Ashok Kumar Nanjundan
- Schole of Engineering, University of Southern Queensland, Springfield, Queensland, 4300, Australia
| | - Jinjie Qian
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, China
| | - Deepak P Dubal
- Centre for Materials Science, School of Chemistry & Physics, Queensland University of Technology, Brisbane, Queensland, 4000, Australia
| |
Collapse
|
3
|
Menke BA, Ryu C, Justin GA, Chundury RV, Hayek BR, Debiec MR, Yeh S. Ophthalmic manifestations and management considerations for emerging chemical threats. FRONTIERS IN TOXICOLOGY 2023; 5:1281041. [PMID: 37941806 PMCID: PMC10629503 DOI: 10.3389/ftox.2023.1281041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 10/03/2023] [Indexed: 11/10/2023] Open
Abstract
Chemical agents have been utilized for centuries in warfare and pose a health threat to civilians and military personnel during armed conflict. Despite treaties and regulations against their use, chemical agent exposure remains a threat and measures to understand their effects and countermeasures for systemic and organ-specific health are needed. Many of these agents have ocular complications, both acute and chronic. This mini-review focuses on key chemical agents including vesicants (mustards, lewisite), nerve agents (sarin, VX), knockdown gasses (hydrogen cyanide), and caustics (hydrofluoric acid). Their ophthalmic manifestations and appropriate treatment are emphasized. Acute interventions include removal of the source and meticulous decontamination, as well as normalization of pH to 7.2-7.4 if alteration of the ocular pH is observed. Besides vigorous lavage, acute therapies may include topical corticosteroids and non-steroid anti-inflammatory therapies. Appropriate personal protective equipment (PPE) and strict donning and doffing protocols to avoid healthcare provider exposure are also paramount in the acute setting. For more severe disease, corneal transplantation, amniotic membrane graft, and limbal stem cell transplantation may be needed. Orbital surgery may be required in patients in whom cicatricial changes of the ocular surface have developed, leading to eyelid malposition. Multidisciplinary care teams are often required to handle the full spectrum of findings and consequences associated with emerging chemical threats.
Collapse
Affiliation(s)
- Bryant A. Menke
- Department of Ophthalmology, Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, NE, United States
| | - Christine Ryu
- Department of Ophthalmology, Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, NE, United States
| | - Grant A. Justin
- Walter Reed National Military Medical Center, Washington, DC, United States
| | - Rao V. Chundury
- Department of Ophthalmology, Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, NE, United States
- National Strategic Research Institute, University of Nebraska Medical Center, Omaha, NE, United States
| | - Brent R. Hayek
- North Georgia Eye Clinic, Gainesville, GA, United States
| | - Matthew R. Debiec
- Walter Reed National Military Medical Center, Washington, DC, United States
| | - Steven Yeh
- Department of Ophthalmology, Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, NE, United States
- National Strategic Research Institute, University of Nebraska Medical Center, Omaha, NE, United States
- Global Center for Health Security, University of Nebraska Medical Center, Omaha, NE, United States
| |
Collapse
|
4
|
Das B, Majumder D. A molecular docking-based comparative assessment of various anticholinergic drugs as antidotes to different nerve agent poisoning. J Biomol Struct Dyn 2023; 41:7809-7820. [PMID: 36152998 DOI: 10.1080/07391102.2022.2125904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 09/10/2022] [Indexed: 10/14/2022]
Abstract
Nerve agent poisoning is still a threat to civilization. Nerve agents function by binding with the enzyme acetylcholinesterase irreversibly. Accumulation of acetylcholine in the synapse causes over-stimulation of muscarinic and nicotinic acetylcholinergic receptors. Thus miosis, glandular hyper secretion, bronchoconstriction, vomiting, diarrhea and bradycardia occurs (by M1-M5 receptors stimulation); whereas convulsion and seizures occur due to the nicotinic receptors. Atropine is a non-selective muscarinic antagonists but no nicotinic antagonists are known. Seizures are controlled by diazepam. Enzyme aging occurs without treatment which causes the enzyme resistant to oxime therapy. Though numerous wet-lab based works has carried out, however, recent time there is an over-growing trend to make comparative assessment of drugs and toxicants. Here we made a molecular docking based comparative assessments between nerve agents toxicity and efficacy of different drugs to prevent this toxicity. Our results suggest that VX is the most harmful organophosphate nerve agents and HI-6 is the best drug followed by Obidoxime and Pralidoxime to free acetylcholinestarase. Docking results correspond the data trend of different in vivo experiments for the assessment of severity of different nerve agents and/or effectiveness of different antidote drugs. Our study reinforces the utility of pretreatment of the enzyme with a carbamic acid derivative like Pyridostigmine bromide which inhibits the enzyme reversibly to a smaller extent and thus, prevent the enzyme from aging and the nerve agent binding.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Bishwajit Das
- Society for Systems Biology & Translational Research, Kolkata, India
- Department of Physiology, West Bengal State University, Kolkata, India
| | - Durjoy Majumder
- Department of Physiology, West Bengal State University, Kolkata, India
| |
Collapse
|
5
|
Meyer C, Rao NS, Vasanthi SS, Pereira B, Gage M, Putra M, Holtkamp C, Huss J, Thippeswamy T. Peripheral and central effects of NADPH oxidase inhibitor, mitoapocynin, in a rat model of diisopropylfluorophosphate (DFP) toxicity. Front Cell Neurosci 2023; 17:1195843. [PMID: 37416507 PMCID: PMC10320212 DOI: 10.3389/fncel.2023.1195843] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/08/2023] [Indexed: 07/08/2023] Open
Abstract
Organophosphates (OP) are highly toxic chemical nerve agents that have been used in chemical warfare. Currently, there are no effective medical countermeasures (MCMs) that mitigate the chronic effects of OP exposure. Oxidative stress is a key mechanism underlying OP-induced cell death and inflammation in the peripheral and central nervous systems and is not mitigated by the available MCMs. NADPH oxidase (NOX) is one of the leading producers of reactive oxygen species (ROS) following status epilepticus (SE). In this study, we tested the efficacy of the mitochondrial-targeted NOX inhibitor, mitoapocynin (MPO) (10 mg/kg, oral), in a rat diisopropylfluorophosphate (DFP) model of OP toxicity. In DFP-exposed animals, MPO decreased oxidative stress markers nitrite, ROS, and GSSG in the serum. Additionally, MPO significantly reduced proinflammatory cytokines IL-1β, IL-6, and TNF-α post-DFP exposure. There was a significant increase in GP91phox, a NOX2 subunit, in the brains of DFP-exposed animals 1-week post-challenge. However, MPO treatment did not affect NOX2 expression in the brain. Neurodegeneration (NeuN and FJB) and gliosis [microglia (IBA1 and CD68), and astroglia (GFAP and C3)] quantification revealed a significant increase in neurodegeneration and gliosis after DFP-exposure. A marginal reduction in microglial cells and C3 colocalization with GFAP in DFP + MPO was observed. The MPO dosing regimen used in this study at 10 mg/kg did not affect microglial CD68 expression, astroglial count, or neurodegeneration. MPO reduced DFP-induced oxidative stress and inflammation markers in the serum but only marginally mitigated the effects in the brain. Dose optimization studies are required to determine the effective dose of MPO to mitigate DFP-induced changes in the brain.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | - Thimmasettappa Thippeswamy
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| |
Collapse
|
6
|
Backer BS, Meek EC, Ross MK, Chambers JE. Pharmacokinetics of three novel pyridinium aldoxime acetylcholinesterase reactivators in female rats. Toxicol Appl Pharmacol 2022; 446:116046. [PMID: 35550885 DOI: 10.1016/j.taap.2022.116046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 04/29/2022] [Accepted: 05/01/2022] [Indexed: 10/18/2022]
Abstract
A platform of novel lipophilic substituted phenoxyalkyl pyridinium oximes was invented to reactivate organophosphate-inhibited acetylcholinesterase. This platform has provided superior efficacy in rats to the current standard of care, 2-PAM, for survival of lethal doses of nerve agent surrogates as well as evidence of brain penetration and neuroprotection. The pharmacokinetics of three of these novel oximes in female rats was studied for comparison to previous data in male rats. Compared to the published half-life of 2-PAM (less than 2 h), the lead novel oxime, Oxime 20, displayed a plasma half-life of about 5 h in both sexes of rats following intramuscular administration. Very few sex differences in pharmacokinetic parameters were apparent. Oxime 20 displayed an increase in brain concentration to plasma concentration over the initial 2 h following intramuscular administration in male rats, with a plateau at 1 h; there were no differences in brain concentrations between the sexes at 2 h. Hepatic metabolism of Oxime 20 was higher in rat microsomes than in human microsomes. The relatively long plasma half-life is likely an important factor in both the enhanced survival and the neuroprotection previously observed for Oxime 20. The metabolism data suggest that the clearance of Oxime 20 could be slower in humans than was observed in rats, which might allow less frequent administration than 2-PAM for therapy of organophosphate acute toxicity. Therefore, the pharmacokinetic data combined with our earlier efficacy data suggest that Oxime 20 has potential as a superior therapeutic for nerve agent poisoning.
Collapse
Affiliation(s)
- Brian S Backer
- College of Veterinary Medicine, Department of Comparative Biomedical Sciences, Center for Environmental Health Sciences, Mississippi State University, Mississippi State, MS 39762, United States of America
| | - Edward C Meek
- College of Veterinary Medicine, Department of Comparative Biomedical Sciences, Center for Environmental Health Sciences, Mississippi State University, Mississippi State, MS 39762, United States of America
| | - Matthew K Ross
- College of Veterinary Medicine, Department of Comparative Biomedical Sciences, Center for Environmental Health Sciences, Mississippi State University, Mississippi State, MS 39762, United States of America
| | - Janice E Chambers
- College of Veterinary Medicine, Department of Comparative Biomedical Sciences, Center for Environmental Health Sciences, Mississippi State University, Mississippi State, MS 39762, United States of America.
| |
Collapse
|
7
|
Figueroa-Villar JD, Petronilho EC, Kuca K, Franca TCC. Review about Structure and Evaluation of Reactivators of Acetylcholinesterase Inhibited with Neurotoxic Organophosphorus Compounds. Curr Med Chem 2021; 28:1422-1442. [PMID: 32334495 DOI: 10.2174/0929867327666200425213215] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 03/08/2020] [Accepted: 04/01/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Neurotoxic chemical warfare agents can be classified as some of the most dangerous chemicals for humanity. The most effective of those agents are the Organophosphates (OPs) capable of restricting the enzyme Acetylcholinesterase (AChE), which in turn, controls the nerve impulse transmission. When AChE is inhibited by OPs, its reactivation can be usually performed through cationic oximes. However, until today, it has not been developed one universal defense agent, with complete effective reactivation activity for AChE inhibited by any of the many types of existing neurotoxic OPs. For this reason, before treating people intoxicated by an OP, it is necessary to determine the neurotoxic compound that was used for contamination, in order to select the most effective oxime. Unfortunately, this task usually requires a relatively long time, raising the possibility of death. Cationic oximes also display a limited capacity of permeating the Blood-Brain Barrier (BBB). This fact compromises their capacity to reactivating AChE inside the nervous system. METHODS We performed a comprehensive search on the data about OPs available on the scientific literature today in order to cover all the main drawbacks still faced in the research for the development of effective antidotes against those compounds. RESULTS Therefore, this review about neurotoxic OPs and the reactivation of AChE, provides insights for the new agents' development. The most expected defense agent is a molecule without toxicity and effective to reactivate AChE inhibited by all neurotoxic OPs. CONCLUSION To develop these new agents, the application of diverse scientific areas of research, especially theoretical procedures as computational science (computer simulation, docking and dynamics), organic synthesis, spectroscopic methodologies, biology, biochemical and biophysical information, medicinal chemistry, pharmacology and toxicology, is necessary.
Collapse
Affiliation(s)
- José Daniel Figueroa-Villar
- Medicinal Chemistry Group, Department of Chemical Engineering, Military Institute of Engineering, 22270- 090, Rio de Janeiro, Brazil
| | - Elaine C Petronilho
- Medicinal Chemistry Group, Department of Chemical Engineering, Military Institute of Engineering, 22270- 090, Rio de Janeiro, Brazil
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Králové 50003, Czech Republic
| | - Tanos C C Franca
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Králové 50003, Czech Republic
| |
Collapse
|
8
|
Abstract
Nerve agents and neurobiological weapons are among the most devastating and lethal of weapons. Acetylcholinesterase inhibitors act by increasing the amount of acetylcholine in the neuromuscular junction, resulting in flaccid paralysis. Tabun, VX, soman, and sarin are the major agents in this category. Exposure to nerve agents can be inhalational or through dermal contact. Neurotoxins may have peripheral and central effects on the nervous system. Atropine is an effective antidote to nerve agents. Neurobiological weapons entail using whole organisms or organism-synthesized toxins as agents. Some organisms that can be used as biological weapons include smallpox virus.
Collapse
Affiliation(s)
- James J Sejvar
- Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Mailstop H24-12, Atlanta, GA 30033, USA.
| |
Collapse
|
9
|
Gore A. Broad Spectrum Treatment for Ocular Insult Induced by Organophosphate Chemical Warfare Agents. Toxicol Sci 2020; 177:1-10. [DOI: 10.1093/toxsci/kfaa095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Abstract
Warfare organophosphates nerve agents constitute one of the prime threats to mankind on the battlefield and in the scenario of civilian terror. Exposure to organophosphate (OP) nerve agents dose-dependently result in incapacitation. They affect multiple organs, but the eye is one of the first and most frequently affected. Ocular OP insult may result in long-term miosis, impaired visual function, and ocular pain thus inducing functional incapacitation. The currently recommended military medical doctrine of using 1% atropine eye drops is far from being the optimal treatment. Although effective in reducing ocular pain and the miotic response, this treatment induces long-term mydriasis and cycloplegia promoting photophobia and restricted accommodation, which may result in further impairment in visual function. An optimal treatment must ameliorate the long-term ocular insult enabling rapid return of normal visual function, while avoiding the induction of mydriasis and cycloplegia side effects, which could possibly worsen the visual performance. Optimal treatment should also keep effects of misuse to a minimum. Work done in recent years examined treatments with various anticholinergic drugs alone or used in combination with oxime treatments and may offer improved efficacy in ameliorating the ocular insult. This review is a summary of the applied research in animals and will discuss clinical implications and possible alterations in treatment protocols following OP exposure. Taken together the data points toward the use of topical low concentrations of potent anticholinergic ophthalmic drops such as atropine or homatropine, which rapidly ameliorate the long-term OP-induced ocular insult.
Collapse
Affiliation(s)
- Ariel Gore
- Department of Pharmacology, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| |
Collapse
|
10
|
Chen H, Snurr RQ. Insights into Catalytic Gas-Phase Hydrolysis of Organophosphate Chemical Warfare Agents by MOF-Supported Bimetallic Metal-Oxo Clusters. ACS APPLIED MATERIALS & INTERFACES 2020; 12:14631-14640. [PMID: 31909586 DOI: 10.1021/acsami.9b19484] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Zirconium-based metal-organic frameworks (Zr-MOFs) have been reported to be efficient catalysts for the hydrolysis of organophosphate chemical warfare agents (CWAs) in buffered solutions. However, for the gas-phase reaction, which is more relevant to the situation in a battlefield gas mask application, the kinetics of Zr-MOF catalysts may be severely hindered by strong product inhibition. To improve the catalytic performance, we computationally screened a series of synthetically accessible Zr-MOF-supported bimetallic metal-oxo clusters in which the metal-oxygen-metal active motif is preserved, aiming to find catalysts that have lower binding affinities to the hydrolysis product. For the promising catalyst Al2O2(OH)2@NU-1000 identified from the screening using density functional theory, we mapped out the full reaction pathway of gas-phase dimethyl p-nitrophenolphosphate (DMNP) hydrolysis and analyzed the free energy profile as well as the turnover frequency (TOF). We found that the catalytic mechanism on the new catalyst is slightly different from the one on NU-1000, which also led to a different TOF-limiting step. Additional factors that can affect the overall catalytic performance in practical application, such as the amount of ambient moisture and the existence of acid gases that may poison the catalyst, have also been evaluated.
Collapse
Affiliation(s)
- Haoyuan Chen
- Department of Chemical & Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Randall Q Snurr
- Department of Chemical & Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| |
Collapse
|
11
|
Robidillo CJT, Wandelt S, Dalangin R, Zhang L, Yu H, Meldrum A, Campbell RE, Veinot JGC. Ratiometric Detection of Nerve Agents by Coupling Complementary Properties of Silicon-Based Quantum Dots and Green Fluorescent Protein. ACS APPLIED MATERIALS & INTERFACES 2019; 11:33478-33488. [PMID: 31414591 DOI: 10.1021/acsami.9b10996] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ratiometric photoluminescent detection of the toxicologically potent organophosphate ester nerve agents paraoxon (PX) and parathion (PT) using the complementary optical and chemical properties of the long Stokes shift green fluorescent protein variant, mAmetrine1.2 (mAm), and red-emitting silicon-based quantum dots (SiQDs) is reported. PX and PT selectively quench SiQD photoluminescence (PL) through a dynamic quenching mechanism, thereby, facilitating the development of a ratiometric sensor platform that shows micromolar limits of detection for PX and PT and that is unaffected by the presence of common inorganic and organic interferents. As a part of the present study, we also demonstrate that the paper-based sensors derived from mAm and SiQDs detect PX and PT at concentrations as low as 5 μM using a readily available commercial color analysis smartphone "app". The ratiometric sensor reported herein can potentially be used for the convenient and rapid on-site detection and quantification of PX and PT in real-world samples.
Collapse
Affiliation(s)
- Christopher Jay T Robidillo
- Department of Chemistry , University of Alberta , Edmonton , Alberta T6G 2G2 , Canada
- Department of Physical Sciences and Mathematics , University of the Philippines Manila , P. Faura Street , Ermita, Manila 1000 , Philippines
| | - Sophia Wandelt
- Faculty of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Munich 81377 , Germany
| | - Rochelin Dalangin
- Department of Chemistry , University of Alberta , Edmonton , Alberta T6G 2G2 , Canada
| | - Lijuan Zhang
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2E1 , Canada
| | - Haoyang Yu
- Department of Chemistry , University of Alberta , Edmonton , Alberta T6G 2G2 , Canada
| | - Alkiviathes Meldrum
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2E1 , Canada
| | - Robert E Campbell
- Department of Chemistry , University of Alberta , Edmonton , Alberta T6G 2G2 , Canada
- Department of Chemistry , The University of Tokyo , Tokyo 113-0033 , Japan
| | - Jonathan G C Veinot
- Department of Chemistry , University of Alberta , Edmonton , Alberta T6G 2G2 , Canada
| |
Collapse
|
12
|
Hester KP, Bhattarai K, Jiang H, Agarwal PK, Pope C. Engineering Dynamic Surface Peptide Networks on Butyrylcholinesterase G117H for Enhanced Organophosphosphorus Anticholinesterase Catalysis. Chem Res Toxicol 2019; 32:1801-1810. [PMID: 31411024 DOI: 10.1021/acs.chemrestox.9b00146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The single residue mutation of butyrylcholinesterase (BChEG117H) hydrolyzes a number of organophosphosphorus (OP) anticholinesterases. Whereas other BChE active site/proximal mutations have been investigated, none are sufficiently active to be prophylactically useful. In a fundamentally different computer simulations driven strategy, we identified a surface peptide loop (residues 278-285) exhibiting dynamic motions during catalysis and modified it via residue insertions. We evaluated these loop mutants using computer simulations, substrate kinetics, resistance to inhibition, and enzyme reactivation assays using both the choline ester and OP substrates. A slight but significant increase in reactivation was noted with paraoxon with one of the mutants, and changes in KM and catalytic efficiency were noted in others. Simulations suggested weaker interactions between OP versus choline substrates and the active site of all engineered versions of the enzyme. The results indicate that an improvement of OP anticholinesterase hydrolysis through surface loop engineering may be a more effective strategy in an enzyme with higher intrinsic OP compound hydrolase activity.
Collapse
Affiliation(s)
- Kirstin P Hester
- Department of Physiological Sciences , Oklahoma State University , Stillwater , Oklahoma 74078 , United States
| | - Krishna Bhattarai
- Department of Entomology and Plant Pathology , Oklahoma State University , Stillwater , Oklahoma 74078 , United States
| | - Haobo Jiang
- Department of Entomology and Plant Pathology , Oklahoma State University , Stillwater , Oklahoma 74078 , United States
| | - Pratul K Agarwal
- Department of Biochemistry & Cellular and Molecular Biology , University of Tennessee , Knoxville , Tennessee 37996 , United States.,Arium BioLabs , 2519 Caspian Drive , Knoxville , Tennessee 37932 , United States
| | - Carey Pope
- Department of Physiological Sciences , Oklahoma State University , Stillwater , Oklahoma 74078 , United States
| |
Collapse
|
13
|
Hoffman KM, Eisen MR, Chandler JK, Nelson MR, Johnson EA, McNutt PM. Retrograde activation of CB1R by muscarinic receptors protects against central organophosphorus toxicity. Neuropharmacology 2019; 155:113-120. [PMID: 31132436 DOI: 10.1016/j.neuropharm.2019.05.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 04/18/2019] [Accepted: 05/21/2019] [Indexed: 11/17/2022]
Abstract
The acute toxicity of organophosphorus-based compounds is primarily a result of acetylcholinesterase inhibition in the central and peripheral nervous systems. The resulting cholinergic crisis manifests as seizure, paralysis, respiratory failure and neurotoxicity. Though overstimulation of muscarinic receptors is the mechanistic basis of central organophosphorus (OP) toxicities, short-term changes in synapse physiology that precede OP-induced seizures have not been investigated in detail. To study acute effects of OP exposure on synaptic function, field excitatory postsynaptic potentials (fEPSPs) were recorded from Schaffer collateral synapses in the mouse hippocampus CA1 stratum radiatum during perfusion with various OP compounds. Administration of the OPs paraoxon, soman or VX rapidly and stably depressed fEPSPs via a presynaptic mechanism, while the non-OP proconvulsant tetramethylenedisulfotetramine had no effect on fEPSP amplitudes. OP-induced presynaptic long-term depression manifested prior to interictal spiking, occurred independent of recurrent firing, and did not require NMDA receptor currents, suggesting that it was not mediated by activity-dependent calcium uptake. Pharmacological dissection revealed that the presynaptic endocannabinoid type 1 receptor (CB1R) as well as postsynaptic M1 and M3 muscarinic acetylcholine receptors were necessary for OP-LTD. Administration of CB1R antagonists significantly reduced survival in mice after a soman challenge, revealing an acute protective role for endogenous CB1R signaling during OP exposure. Collectively these data demonstrate that the endocannabinoid system alters glutamatergic synaptic function during the acute response to OP acetylcholinesterase inhibitors.
Collapse
Affiliation(s)
- Katie M Hoffman
- Biological Sciences, Lehigh University, 27 Memorial Drive West, Bethlehem, PA, 18015, USA
| | - Margaret R Eisen
- Department of Neuroscience, United States Army Medical Research Institute of Chemical Defense, 2900 Ricketts Point Road, Gunpowder, MD, 21010, USA
| | - Jessica K Chandler
- Department of Neuroscience, United States Army Medical Research Institute of Chemical Defense, 2900 Ricketts Point Road, Gunpowder, MD, 21010, USA
| | - Marian R Nelson
- Department of Neuroscience, United States Army Medical Research Institute of Chemical Defense, 2900 Ricketts Point Road, Gunpowder, MD, 21010, USA
| | - Erik A Johnson
- Department of Neuroscience, United States Army Medical Research Institute of Chemical Defense, 2900 Ricketts Point Road, Gunpowder, MD, 21010, USA
| | - Patrick M McNutt
- Department of Neuroscience, United States Army Medical Research Institute of Chemical Defense, 2900 Ricketts Point Road, Gunpowder, MD, 21010, USA.
| |
Collapse
|
14
|
Thompson CM, Gerdes JM, VanBrocklin HF. Positron emission tomography studies of organophosphate chemical threats and oxime countermeasures. Neurobiol Dis 2019; 133:104455. [PMID: 31022458 DOI: 10.1016/j.nbd.2019.04.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 03/28/2019] [Accepted: 04/19/2019] [Indexed: 01/31/2023] Open
Abstract
There is a unique in vivo interplay involving the mechanism of inactivation of acetylcholinesterase (AChE) by toxic organophosphorus (OP) compounds and the restoration of AChE activity by oxime antidotes. OP compounds form covalent adducts to this critical enzyme target and oximes are introduced to directly displace the OP from AChE. For the most part, the in vivo inactivation of AChE leading to neurotoxicity and antidote-based therapeutic reversal of this mechanism are well understood, however, these molecular-level events have not been evaluated by dynamic imaging in living systems at millimeter resolution. A deeper understanding of these critically, time-dependent mechanisms is needed to develop new countermeasures. To address this void and to help accelerate the development of new countermeasures, positron-emission tomography (PET) has been investigated as a unique opportunity to create platform technologies to directly examine the interdependent toxicokinetic/pharmacokinetic and toxicodynamic/pharmacodynamic features of OPs and oximes in real time within live animals. This review will cover two first-in-class PET tracers representing an OP and an oxime antidote, including their preparation, requisite pharmacologic investigations, mechanistic interpretations, biodistribution and imaging.
Collapse
Affiliation(s)
- Charles M Thompson
- Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, MT 59812, USA.
| | - John M Gerdes
- Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, MT 59812, USA
| | - Henry F VanBrocklin
- Department of Radiology and Biomedical Imaging, University of California, San Francisco 185 Berry St. Suite 350, San Francisco, CA 94107, USA
| |
Collapse
|
15
|
Rapid quantification of two chemical nerve agent metabolites in serum. Biosens Bioelectron 2019; 131:119-127. [PMID: 30826646 DOI: 10.1016/j.bios.2019.01.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/21/2019] [Accepted: 01/22/2019] [Indexed: 02/07/2023]
Abstract
Organophosphorus compounds (OPs) continue to represent a significant chemical threat to humans due to exposures from their use as weapons, their potential storage hazards, and from their continued use agriculturally. Existing methods for detection include ELISA and mass spectrometry. The new approach presented here provides an innovative first step toward a portable OP quantification method that surmounts conventional limitations involving sensitivity, selectivity, complexity, and portability. DNA affinity probes, or aptamers, represent an emerging technology that, when combined with a mix-and-read, free-solution assay (FSA) and a compensated interferometer (CI) can provide a novel alternative to existing OP nerve agent (OPNA) quantification methods. Here it is shown that FSA can be used to rapidly screen prospective aptamers in the biological matrix of interest, allowing the identification of a 'best-in-class' probe. It is also shown that combining aptamers with FSA-CI enables quantification of the OPNA metabolites, Sarin (NATO designation "G-series, B", or GB) and Venomous Agent X (VX) acids, rapidly with high selectivity at detection limits of sub-10 pg/mL in 25% serum (by volume in PBS). These results suggest there is potential to directly impact diagnostic specificity and sensitivity of emergency response testing methods by both simplifying sample preparation procedures and making a benchtop reader available for OPNA metabolite quantification.
Collapse
|
16
|
Swami D, Yadav R, Bhaskar ASB, Soni A, Nagar DP, Acharya J, Karade HN, Singh KP, Kumar P. Comparative evaluation of antidotal efficacy of 2-PAM and HNK-102 oximes during inhalation of sarin vapor in Swiss albino mice. Inhal Toxicol 2018; 30:287-298. [PMID: 30375901 DOI: 10.1080/08958378.2018.1520369] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Efficacy of two oximes treatments evaluated during inhalation of sarin vapor (LCt50, 755.9 mg/min/m3) in simulated real scenario in vivo. Majority of mice either became moribund or died within 1-2 min during exposure to multifold-lethal concentrations of sarin vapor. Protection indices were determined by exposing to sarin vapor in two sessions, 1 min exposure followed by treatments with or without HNK-102 (56.56 mg/kg, im) or 2-PAM (30 mg/kg, im) and atropine (10 mg/kg, ip), and again exposed for remaining 14 min. Protection offered by HNK-102 was found to be four folds higher compared to 2-PAM in the same toxic environment. Secondly, sub-lethal concentration of sarin vapor (0.8 × LCt50 or 605 mg/min/m3), 24 h post investigations revealed that the oximes could not reactivate brain and serum acetylcholinesterase (AChE) activity. The treatments prevented increase in protein concentration (p < .05) and macrophages infiltration compared to sarin alone group in broncho-alveolar lavage fluid. Lung histopathology showed intense peribronchial infiltration and edema with desquamating epithelial lining and mild to moderate alveolar septal infiltration in sarin and atropine groups, respectively. Noticeable peeling-off observed in epithelial lining and sporadic mild infiltration of epithelial cells at bronchiolar region in 2-PAM and HNK-102 groups, respectively. The oximes failed to reactivate AChE activity; however, the mice survived up to 6.0 × LCt50, proved involvement of non-AChE targets in sarin toxicity. Atropine alone treatment was found to be either ineffective or increased the toxicity. HNK-102, exhibited better survivability with lung protection, can be considered as a better replacement for 2-PAM to treat sarin inhalation induced poisoning.
Collapse
Affiliation(s)
- Devyani Swami
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| | - Ruchi Yadav
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| | - A S B Bhaskar
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| | - A Soni
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| | - D P Nagar
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| | - J Acharya
- b Process Technology Development Division , Defence Research & Development Establishment , Gwalior , India
| | - H N Karade
- b Process Technology Development Division , Defence Research & Development Establishment , Gwalior , India
| | - K P Singh
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| | - Pravin Kumar
- a Pharmacology and Toxicology Division , Defence Research & Development Establishment , Gwalior , India
| |
Collapse
|
17
|
Figueiredo TH, Apland JP, Braga MFM, Marini AM. Acute and long-term consequences of exposure to organophosphate nerve agents in humans. Epilepsia 2018; 59 Suppl 2:92-99. [PMID: 30159887 DOI: 10.1111/epi.14500] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2018] [Indexed: 12/20/2022]
Abstract
Nerve agents are organophosphate (OP) compounds and among the most powerful poisons known to man. A terrorist attack on civilian or military populations causing mass casualties is a real threat. The OP nerve agents include soman, sarin, cyclosarin, tabun, and VX. The major mechanism of acute toxicity is the irreversible inhibition of acetylcholinesterase. Acetylcholinesterase inhibition results in the accumulation of excessive acetylcholine levels in synapses, leading to progression of toxic signs including hypersecretions, tremors, status epilepticus, respiratory distress, and death. Miosis and rhinorrhea are the most common clinical findings in those individuals acutely exposed to OP nerve agents. Prolonged seizures are responsible for the neuropathology. The brain region that shows the most severe damage is the amygdala, followed by the piriform cortex, hippocampus, cortex, thalamus, and caudate/putamen. Current medical countermeasures are only modestly effective in attenuating the seizures and neuropathology. Anticonvulsants such as benzodiazepines decrease seizure activity and improve outcome, but their efficacy depends upon the administration time after exposure to the nerve agent. Administration of benzodiazepines may increase the risk for seizure recurrence. Recent studies document long-term neurologic and behavior deficits, and technological advances demonstrate structural brain changes on magnetic resonance imaging.
Collapse
Affiliation(s)
- Taiza H Figueiredo
- Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - James P Apland
- Neuroscience Program, US Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground, MD, USA
| | - Maria F M Braga
- Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Ann M Marini
- Department of Neurology and Program in Neuroscience, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| |
Collapse
|
18
|
Polyionic complexes of butyrylcholinesterase and poly-l-lysine-g-poly(ethylene glycol): Comparative kinetics of catalysis and inhibition and in vitro inactivation by proteases and heat. Chem Biol Interact 2017; 275:86-94. [DOI: 10.1016/j.cbi.2017.07.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 06/27/2017] [Accepted: 07/25/2017] [Indexed: 01/11/2023]
|
19
|
Pavlikova R, Misik J, Cabal J, Marek J, Kuca K. In vitro skin decontamination of paraoxon – wet-type cleansing effect of selected detergents. Cutan Ocul Toxicol 2017; 37:77-83. [DOI: 10.1080/15569527.2017.1354216] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ruzena Pavlikova
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czech Republic
| | - Jan Misik
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czech Republic
| | - Jiri Cabal
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czech Republic
| | - Jan Marek
- Biomedical Research Centre, University Hospital, Hradec Kralove, Czech Republic
- Department of Surgical Studies, Faculty of Medicine, University of Ostrava, Ostrava, Czech Republic
| | - Kamil Kuca
- Biomedical Research Centre, University Hospital, Hradec Kralove, Czech Republic
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech Republic
| |
Collapse
|
20
|
Egoz I, Nili U, Grauer E, Gore A. Optimization of the Ocular Treatment Following Organophosphate Nerve Agent Insult. Toxicol Sci 2017; 159:50-63. [DOI: 10.1093/toxsci/kfx119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
21
|
Snider TH, Babin MC, Jett DA, Platoff GE, Yeung DT. Toxicity and median effective doses of oxime therapies against percutaneous organophosphorus pesticide and nerve agent challenges in the Hartley guinea pig. J Toxicol Sci 2017; 41:511-21. [PMID: 27432237 DOI: 10.2131/jts.41.511] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Anticholinesterases, such as organophosphorus pesticides and warfare nerve agents, present a significant health threat. Onset of symptoms after exposure can be rapid, requiring quick-acting, efficacious therapy to mitigate the effects. The goal of the current study was to identify the safest antidote with the highest therapeutic index (TI = oxime 24-hr LD50/oxime ED50) from a panel of four oximes deemed most efficacious in a previous study. The oximes tested were pralidoxime chloride (2-PAM Cl), MMB4 DMS, HLö-7 DMS, and obidoxime Cl2. The 24-hr median lethal dose (LD50) for the four by intramuscular (IM) injection and the median effective dose (ED50) were determined. In the ED50 study, male guinea pigs clipped of hair received 2x LD50 topical challenges of undiluted Russian VX (VR), VX, or phorate oxon (PHO) and, at the onset of cholinergic signs, IM therapy of atropine (0.4 mg/kg) and varying levels of oxime. Survival was assessed at 3 hr after onset clinical signs. The 3-hr 90th percentile dose (ED90) for each oxime was compared to the guinea pig pre-hospital human-equivalent dose of 2-PAM Cl, 149 µmol/kg. The TI was calculated for each OP/oxime combination. Against VR, MMB4 DMS had a higher TI than HLö-7 DMS, whereas 2-PAM Cl and obidoxime Cl2 were ineffective. Against VX, MMB4 DMS > HLö-7 DMS > 2-PAM Cl > obidoxime Cl2. Against PHO, all performed better than 2-PAM Cl. MMB4 DMS was the most effective oxime as it was the only oxime with ED90 < 149 µmol/kg against all three topical OPs tested.
Collapse
|
22
|
Reddy DS, Colman E. A Comparative Toxidrome Analysis of Human Organophosphate and Nerve Agent Poisonings Using Social Media. Clin Transl Sci 2017; 10:225-230. [PMID: 28238224 PMCID: PMC5421825 DOI: 10.1111/cts.12435] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 11/15/2016] [Indexed: 12/16/2022] Open
Abstract
Here we utilized social media to compare the toxidrome of three lethal chemical exposures worldwide. YouTube videos were the main source from which the data were collected, but published reports and news were also utilized to fill in some gaps. All videos were organized in a database detailing symptoms and severity of each victim, along with demographics such as approximate age and gender. Each symptom was rated as mild, moderate, or severe and corresponding pie graphs for each incident were compared. The videos displayed symptoms ranging from mild to severe cholinergic toxicity and life‐threatening convulsions. Social media may represent an important resource in developing a viable approach to the early detection and identification of chemical exposure, reinforce our preparedness for better antidotes, long‐term follow up, and training about deadly chemical nerve agent attacks.
Collapse
Affiliation(s)
- D S Reddy
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University Health Science Center, Bryan, Texas, USA
| | - E Colman
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University Health Science Center, Bryan, Texas, USA
| |
Collapse
|
23
|
Chao CK, Ahmed SK, Gerdes JM, Thompson CM. Novel Organophosphate Ligand O-(2-Fluoroethyl)-O-(p-Nitrophenyl)Methylphosphonate: Synthesis, Hydrolytic Stability and Analysis of the Inhibition and Reactivation of Cholinesterases. Chem Res Toxicol 2016; 29:1810-1817. [PMID: 27551891 PMCID: PMC5575788 DOI: 10.1021/acs.chemrestox.6b00160] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The organophosphate O-(2-fluoroethyl)-O-(p-nitrophenyl) methyphosphonate 1 is the first-in-class, fluorine-18 radiolabeled organophosphate inhibitor ([18F]1) of acetylcholinesterase (AChE). In rats, [18F]1 localizes in AChE rich regions of the brain and other tissues where it likely exists as the (CH3)(18FCH2CH2O)P(O)-AChE adduct (ChE-1). Characterization of this adduct would define the inhibition mechanism and subsequent postinhibitory pathways and reactivation rates. To validate this adduct, the stability (hydrolysis) of 1 and ChE-1 reactivation rates were determined. Base hydrolysis of 1 yields p-nitrophenol and (CH3) (FCH2CH2O)P(O)OH with pseudo first order rate constants (kobsd) at pH 7.4 (PBS) of 3.25 × 10-4 min-1 (t1/2 = 35.5 h) at 25 °C and 8.70 × 10-4 min-1 (t1/2 = 13.3 h) at 37 °C. Compound 1 was a potent inhibitor of human acetylcholinesterase (HuAChE; ki = 7.5 × 105 M-1 min-1), electric eel acetylcholinesterase (EEAChE) (ki = 3.0 × 106 M-1 min-1), and human serum butyrylcholinesterase (HuBChE; 1.95 × 105 M-1 min-1). Spontaneous and oxime-mediated reactivation rates for the (CH3) (FCH2CH2O)P(O)-serine ChE adducts using 2-PAM (10 μM) were (a) HuAChE 8.8 × 10-5 min-1 (t1/2 = 131.2 h) and 2.41 × 10-2 min-1 (t1/2 = 0.48 h), (b) EEAChE 9.32 × 10-3 min-1 (t1/2 = 1.24 h) and 3.33 × 10-2 min-1 (t1/2 = 0.35 h), and (c) HuBChE 1.16 × 10-4 min-1 (t1/2 = 99.6 h) and 4.19 × 10-2 min-1 (t1/2 = 0.27 h). All ChE-1 adducts undergo rapid and near complete restoration of enzyme activity following addition of 2-PAM (30 min), and no aging was observed for either reactivation process. The fast reactivation rates and absence of aging of ChE-1 adducts are explained on the basis of the electron-withdrawing fluorine group that favors the nucleophilic reactivation processes but disfavors cation-based dealkylation aging mechanisms. Therefore, the likely fate of radiolabeled compound 1 in vivo is the formation of (CH3)(FCH2CH2O)P(O)-serine adducts and monoacid (CH3)(FCH2CH2O)P(O)OH from hydrolysis and reactivation.
Collapse
Affiliation(s)
- Chih-Kai Chao
- Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, Montana 59812, United States
| | - S. Kaleem Ahmed
- Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, Montana 59812, United States
- Center for Neuromolecular Research, Drug Discovery Division, Southern Research Institute, Birmingham, Alabama 35205, United States
| | - John M. Gerdes
- Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, Montana 59812, United States
- Center for Neuromolecular Research, Drug Discovery Division, Southern Research Institute, Birmingham, Alabama 35205, United States
| | - Charles M. Thompson
- Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, Montana 59812, United States
| |
Collapse
|
24
|
Using the skin protective lotion IB1 as a substitute for chemical protective gloves. Am J Emerg Med 2016; 34:1986-1990. [PMID: 27431736 DOI: 10.1016/j.ajem.2016.07.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 07/05/2016] [Accepted: 07/06/2016] [Indexed: 11/23/2022] Open
Abstract
We aimed to evaluate the performance of medical personnel in using the IB1 topical protective lotion on their hands and wrists together with standard disposable medical gloves, compared to standard-issued medical chemical protective gloves. This randomized cross-over study included 144 medical personnel. Primary endpoints were time-to-completion of autoinjection; success rate, number of attempts, and time-to-achieve successful endotracheal intubation; time-to-achieve satisfactory tube fixation; time-to-draw and inject the content of an ampoule; and the total time-to-perform all medical procedures. Secondary endpoints included the subjective assessment of convenience to perform these four procedures with each protective measure. Mean time was significantly shorter using IB1 compared to chemical protective gloves for tube fixation, ampoule drawing, and the total time-to-perform all procedures (58.6±22.7 seconds vs. 71.7±29.7; 31.5±21.8 vs. 38.2±19.4; 137.4±56.1 vs. 162.5±63.6, respectively; P<.001 for all). For all medical procedures, the use of IB1 was reported as significantly more convenient than the use of chemical protective gloves (P<.001 for all comparisons). IB1 with standard medical gloves significantly shorten the time-to-perform medical procedures requiring fine motor dexterities and is subjectively more convenient than chemical protective gloves. IB1 should be considered as an appropriate alternative for medical teams in a chemical event.
Collapse
|
25
|
Abstract
Chemical Burns make up 3% of burns center admissions and have a mortality rate that varies from 4.1 to 13%. There are over 25,000 products capable of causing chemical burns. These injuries may cause significant tissue necrosis and have the potential for systemic toxicity. This article gives an overview of the various types of chemical burns along with their management. Chemical warfare agents and extravasation injuries will also be briefly discussed.
Collapse
Affiliation(s)
- R. Seth
- St Thomas' Hospital, Guys and St Thomas' Hospital,
| | - D. Chester
- University Hospital Birmingham NHS Foundation Trust
| | - N. Moiemen
- University Hospital Birmingham NHS Foundation Trust
| |
Collapse
|
26
|
Ren ZL, Zhang J, Li HD, Chu MJ, Zhang LS, Yao XK, Xia Y, Lv XH, Cao HQ. Design, Synthesis and Biological Evaluation of α-Aminophosphonate Derivatives Containing a Pyrazole Moiety. Chem Pharm Bull (Tokyo) 2016; 64:1755-1762. [DOI: 10.1248/cpb.c16-00622] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Zi-Li Ren
- School of Plant Protection, Anhui Agricultural University
| | - Jing Zhang
- School of Pharmacy, Anhui University of Chinese Medicine
| | - Hai-dong Li
- School of Materials, The University of Manchester
| | - Ming-Jie Chu
- School of Plant Protection, Anhui Agricultural University
| | - Li-Song Zhang
- School of Plant Protection, Anhui Agricultural University
| | - Xiao-Kang Yao
- School of Plant Protection, Anhui Agricultural University
| | - Yong Xia
- School of Plant Protection, Anhui Agricultural University
| | - Xian-Hai Lv
- School of Plant Protection, Anhui Agricultural University
| | - Hai-Qun Cao
- School of Plant Protection, Anhui Agricultural University
| |
Collapse
|
27
|
Gutch PK, Mazumder A, Raviraju G. Oxidative decontamination of chemical warfare agent VX and its simulant using N,N-dichlorovaleramide. RSC Adv 2016. [DOI: 10.1039/c5ra21918c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The efficient, operationally simple and safe oxidative decontamination of chemical warfare agent O-ethyl-S-2-(N,N-diisopropylaminoethyl)methylphosphonothioate (VX) and its non-toxic simulant O,S-diethyl methylphosphonothioate (OSDEMP) has been reported.
Collapse
Affiliation(s)
- Pranav Kumar Gutch
- Synthetic Chemistry Division
- Defence Research and Development Establishment
- Gwalior-474002
- India
| | - Avik Mazumder
- Vertox Laboratory
- Defence Research and Development Establishment
- Gwalior-474002
- India
| | - Gundapu Raviraju
- Synthetic Chemistry Division
- Defence Research and Development Establishment
- Gwalior-474002
- India
| |
Collapse
|
28
|
Kollek D. Canadian emergency department preparedness for a nuclear, biological or chemical event. CAN J EMERG MED 2015; 5:18-26. [PMID: 17659148 DOI: 10.1017/s148180350000806x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
ABSTRACTSince the terror attacks of September 11th, emergency departments across North America have become more aware of the need to be prepared to deal with a mass casualty terror event, particularly one involving nuclear, biological or chemical contaminants. The effects of such an attack could also be mimicked by accidental release of toxic chemicals, radioactive substances or biological agents unrelated to terrorist activity.The purpose of this study was to review the risks and characteristics of these events and to assess the preparedness of Canadian emergency departments to respond. This was done by means of a survey, which showed a significant risk of a mass casualty event (most likely chemical) coupled with a deficiency in preparedness — most notably in the availability of appropriate equipment, antidotal therapy and decontamination capability. There were also significant deficiencies in the ability to respond to a major biologic or nuclear event.
Collapse
Affiliation(s)
- Daniel Kollek
- Emergency Medicine, McMaster University, Hamilton, Ontario, Canada
| |
Collapse
|
29
|
Gore A, Brandeis R, Egoz I, Turetz J, Nili U, Grauer E, Bloch-Shilderman E. Synergism Between Anticholinergic and Oxime Treatments Against Sarin-Induced Ocular Insult in Rats. Toxicol Sci 2015; 146:301-10. [DOI: 10.1093/toxsci/kfv092] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
30
|
Pd(II) complexes of acetylcholinesterase reactivator obidoxime. Interdiscip Toxicol 2014; 7:139-45. [PMID: 26109891 PMCID: PMC4434107 DOI: 10.2478/intox-2014-0019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 06/24/2014] [Accepted: 06/25/2014] [Indexed: 12/02/2022] Open
Abstract
The ability of the acetylcholinesterase reactivator obidoxime (H2L2+) to bind palladium(II) cations was evaluated spectrophotometrically at different reaction conditions (pH, reaction time, metal-to-ligand molar ratio). The results showed that immediately after mixing the reagents, pH 7.4, complex species of composition [PdHL]3+ existed predominantly with a value of conditional stability constant lgβ‘=6.52. The reaction was completed within 24 hours affording the formation of species [Pd2L]4+ with significantly increased stability (lgβ‘=9.34). The spectral data suggest that obidoxime coordinates metal(II) ions through the oximate functional groups. The in vitro reactivation assay of paraoxon-inhibited rat brain acetylcholinesterase revealed that the new complex species were much less active than the non-coordinated obidoxime. The lack of reactivation ability could be explained by the considerable stability of complexes in solution as well as by the deprotonation of oxime groups essential for recovery of the enzymatic activity.
Collapse
|
31
|
Sirin GS, Zhang Y. How is acetylcholinesterase phosphonylated by soman? An ab initio QM/MM molecular dynamics study. J Phys Chem A 2014; 118:9132-9. [PMID: 24786171 PMCID: PMC4183371 DOI: 10.1021/jp502712d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
Acetylcholinesterase (AChE) is a
crucial enzyme in the cholinergic
nerve system that hydrolyzes acetylcholine (ACh) and terminates synaptic
signals by reducing the effective concentration of ACh in the synaptic
clefts. Organophosphate compounds irreversibly inhibit AChEs, leading
to irreparable damage to nerve cells. By employing Born–Oppenheimer ab initio QM/MM molecular dynamics simulations with umbrella
sampling, a state-of-the-art approach to simulate enzyme reactions,
we have characterized the covalent inhibition mechanism between AChE
and the nerve toxin soman and determined its free energy profile for
the first time. Our results indicate that phosphonylation of the catalytic
serine by soman employs an addition–elimination mechanism,
which is highly associative and stepwise: in the initial addition
step, which is also rate-limiting, His440 acts as a general base to
facilitate the nucleophilic attack of Ser200 on the soman’s
phosphorus atom to form a trigonal bipyrimidal pentacovalent intermediate;
in the subsequent elimination step, Try121 of the catalytic gorge
stabilizes the leaving fluorine atom prior to its dissociation from
the active site. Together with our previous characterization of the
aging mechanism of soman inhibited AChE, our simulations have revealed
detailed molecular mechanistic insights into the damaging function
of the nerve agent soman.
Collapse
Affiliation(s)
- Gulseher Sarah Sirin
- Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine , New York, New York 10016, United States
| | | |
Collapse
|
32
|
Effects of Repeated Low-Dose Exposure of the Nerve Agent VX on Monoamine Levels in Different Brain Structures in Mice. Neurochem Res 2014; 39:911-21. [DOI: 10.1007/s11064-014-1286-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 03/11/2014] [Accepted: 03/14/2014] [Indexed: 11/27/2022]
|
33
|
Acetylcholinesterase inhibitors as Alzheimer therapy: From nerve toxins to neuroprotection. Eur J Med Chem 2013; 70:165-88. [DOI: 10.1016/j.ejmech.2013.09.050] [Citation(s) in RCA: 223] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 09/24/2013] [Accepted: 09/28/2013] [Indexed: 11/22/2022]
|
34
|
A critical role of acute bronchoconstriction in the mortality associated with high-dose sarin inhalation: effects of epinephrine and oxygen therapies. Toxicol Appl Pharmacol 2013; 274:200-8. [PMID: 24269878 DOI: 10.1016/j.taap.2013.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 10/25/2013] [Accepted: 11/10/2013] [Indexed: 01/26/2023]
Abstract
Sarin is an organophosphate nerve agent that is among the most lethal chemical toxins known to mankind. Because of its vaporization properties and ease and low cost of production, sarin is the nerve agent with a strong potential for use by terrorists and rouge nations. The primary route of sarin exposure is through inhalation and, depending on the dose, sarin leads to acute respiratory failure and death. The mechanism(s) of sarin-induced respiratory failure is poorly understood. Sarin irreversibly inhibits acetylcholine esterase, leading to excessive synaptic levels of acetylcholine and, we have previously shown that sarin causes marked ventilatory changes including weakened response to hypoxia. We now show that LD50 sarin inhalation causes severe bronchoconstriction in rats, leading to airway resistance, increased hypoxia-induced factor-1α, and severe lung epithelium injury. Transferring animals into 60% oxygen chambers after sarin exposure improved the survival from about 50% to 75% at 24h; however, many animals died within hours after removal from the oxygen chambers. On the other hand, if LD50 sarin-exposed animals were administered the bronchodilator epinephrine, >90% of the animals survived. Moreover, while both epinephrine and oxygen treatments moderated cardiorespiratory parameters, the proinflammatory cytokine surge, and elevated expression of hypoxia-induced factor-1α, only epinephrine consistently reduced the sarin-induced bronchoconstriction. These data suggest that severe bronchoconstriction is a critical factor in the mortality induced by LD50 sarin inhalation, and epinephrine may limit the ventilatory, inflammatory, and lethal effects of sarin.
Collapse
|
35
|
Ruan Y, Taha HA, Yoder RJ, Maslak V, Hadad CM, Badjić JD. The Prospect of Selective Recognition of Nerve Agents with Modular Basket-like Hosts. A Structure–Activity Study of the Entrapment of a Series of Organophosphonates in Aqueous Media. J Phys Chem B 2013; 117:3240-9. [PMID: 23445375 DOI: 10.1021/jp401841w] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yian Ruan
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, United States
| | - Hashem A. Taha
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, United States
| | - Ryan J. Yoder
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, United States
| | - Veselin Maslak
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, United States
| | - Christopher M. Hadad
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, United States
| | - Jovica D. Badjić
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, United States
| |
Collapse
|
36
|
Sirin GS, Zhou Y, Lior-Hoffmann L, Wang S, Zhang Y. Aging mechanism of soman inhibited acetylcholinesterase. J Phys Chem B 2012; 116:12199-207. [PMID: 22984913 PMCID: PMC3475498 DOI: 10.1021/jp307790v] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Acetylcholinesterase (AChE) is a crucial enzyme in the cholinergic nervous system that hydrolyzes neurotransmitter acetylcholine (ACh) and terminates synaptic signals. The catalytic serine of AChE can be phosphonylated by soman, one of the most potent nerve agents, and subsequently undergo an aging reaction. This phosphonylation and aging process leads to irreversible AChE inhibition, results in accumulation of excess ACh at the synaptic clefts, and causes neuromuscular paralysis. By employing Born-Oppenheimer ab initio QM/MM molecular dynamics simulations with umbrella sampling, a state-of-the-art approach to simulate enzyme reactions, we have characterized the aging mechanism of soman phosphonylated AChE and determined its free energy profile. This aging reaction starts with the scission of the O2-Cα bond, which is followed by methyl migration, and results in a tertiary carbenium intermediate. At the transition state, the scissile O2-Cα bond is already cleaved with an average O-C distance of 3.2 ± 0.3 Å and the migrating methyl group is shared between Cα and Cβ carbons with C-C distances of 1.9 ± 0.1 and 1.8 ± 0.1 Å, respectively. The negatively charged phosphonate group is stabilized by a salt bridge with the imidazole ring of the catalytic histidine. A major product of aging, 2,3-dimethyl-2-butanol can be formed swiftly by the reaction of a water molecule. Our characterized mechanism and simulation results provide new detailed insights into this important biochemical process.
Collapse
Affiliation(s)
- Gulseher Sarah Sirin
- Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, New York, 10016
- Department of Chemistry, New York University, New York, New York, 10003
| | - Yanzi Zhou
- Department of Chemistry, New York University, New York, New York, 10003
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China
| | - Lee Lior-Hoffmann
- Department of Chemistry, New York University, New York, New York, 10003
| | - Shenglong Wang
- Department of Chemistry, New York University, New York, New York, 10003
| | - Yingkai Zhang
- Department of Chemistry, New York University, New York, New York, 10003
| |
Collapse
|
37
|
Nambiar MP, Wright BS, Rezk PE, Smith KB, Gordon RK, Moran TS, Richards SM, Sciuto AM. Development of a microinstillation model of inhalation exposure to assess lung injury following exposure to toxic chemicals and nerve agents in Guinea pigs. Toxicol Mech Methods 2012; 16:295-306. [PMID: 20021028 DOI: 10.1080/15376510600748760] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Respiratory disturbances due to chemical warfare nerve agents (CWNAs) are the starting point of mass casualty and the primary cause of death by these weapons of terror and mass destruction. However, very few studies have been implemented to assess respiratory toxicity and exacerbation induced by CWNAs, especially methylphosphonothioic acid S-(2-(bis(1-methylethyl)amino)ethyl)O-ethyl ester (VX). In this study, we developed a microinstillation technique of inhalation exposure to assess lung injury following exposure to CWNAs and toxic chemicals. Guinea pigs were gently intubated by placing a microcatheter into the trachea 1.5 to 2.0 cm centrally above the bifurcation. This location is crucial to deliver aerosolized agents uniformly to the lung's lobes. The placement of the tube is calculated by measuring the distance from the upper front teeth to the tracheal bifurcation, which is typically 8.5 cm for guinea pigs of equivalent size and a weight range of 250 g to 300 g. The catheter is capable of withstanding 100 psi pressure; the terminus has five peripheral holes to pump air that aerosolizes the nerve agent that is delivered in the central hole. The microcatheter is regulated by a central control system to deliver the aerosolized agent in a volume lower than the tidal volume of the guinea pigs. The average particle size of the nerve agent delivered was 1.48 +/- 0.07 micrometer. The microinstillation technology has been validated by exposing the animals to Coomassie brilliant blue, which showed a uniform distribution of the dye in different lung lobes. In addition, the concentration of the dye in the lungs correlated with the dose/time of exposure. Furthermore, histopathological analysis confirmed the absence of barotraumas following micoinstillation. This novel technique delivers the agent safely, requires less amount of agent, avoids exposure to skin, pelt, and eye, and circumvents the concern of deposition of the particles in the nasal and palette due to the switching of breathing from nasal to oronasal in whole-body dynamic chamber or nose only exposure. Currently, we are using this inhalation exposure technique to investigate lung injuries and respiratory disturbances following direct exposure to VX.
Collapse
Affiliation(s)
- Madhusoodana P Nambiar
- Department of Biochemical Pharmacology/Division of Biochemistry, Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, MD, 20910-7500, USA
| | | | | | | | | | | | | | | |
Collapse
|
38
|
Misik J, Pavlikova R, Josse D, Cabal J, Kuca K. In vitroskin permeation and decontamination of the organophosphorus pesticide paraoxon under various physical conditions – evidence for a wash-in effect. Toxicol Mech Methods 2012; 22:520-5. [DOI: 10.3109/15376516.2012.686535] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
39
|
Emadi SN, Aslani J, Poursaleh Z, Izadi M, Soroush M, Kafashi M, Alavinia SA, Bakhshi H, Karimi A, Momtaz-Manesh K, Babaei AA, Esmaili A, Raygan B, Emadi SE, Babamahmoodi F, Emadi SA. Comparison late cutaneous complications between exposure to sulfur mustard and nerve agents. Cutan Ocul Toxicol 2011; 31:214-9. [DOI: 10.3109/15569527.2011.641196] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
40
|
Gomes DEB, Lins RD, Pascutti PG, Lei C, Soares TA. Conformational variability of organophosphorus hydrolase upon soman and paraoxon binding. J Phys Chem B 2011; 115:15389-98. [PMID: 22098575 DOI: 10.1021/jp208787g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The bacterial enzyme organophosphorus hydrolase (OPH) exhibits both catalytic and substrate promiscuity. It hydrolyzes bonds in a variety of phosphotriester (P-O), phosphonothioate (P-S), phosphofluoridate (P-F), and phosphonocyanate (F-CN) compounds. However, its catalytic efficiency varies markedly for different substrates, limiting the broad-range application of OPH as catalyst in the bioremediation of pesticides and chemical war agents. In the present study, pK(a) calculations and multiple explicit-solvent molecular dynamics (MD) simulations were performed to characterize and contrast the structural dynamics of OPH bound to two substrates hydrolyzed with very distinct catalytic efficiencies: the nerve agent soman (O-pinacolylmethylphosphonofluoridate) and the pesticide paraoxon (diethyl p-nitrophenyl phosphate). pK(a) calculations for the substrate-bound and unbound enzyme showed a significant pK(a) shift from standard values (ΔpK(a) = ±3 units) for residues His254 and Arg275. MD simulations of protonated His254 revealed a dynamic hydrogen bond network connecting the catalytic residue Asp301 via His254 to Asp232, Asp233, Arg275, and Asp235, and is consistent with a previously postulated proton relay mechanism to ferry protons away from the active site with substrates that do not require activation of the leaving group. Hydrogen bonds between Asp301 and His254 were persistent in the OPH-paraoxon complex but not in the OPH-soman one, suggesting a potential role for such interaction in the more efficient hydrolysis of paraoxon over soman by OPH. These results are in line with previous mutational studies of residue His254, which led to an increase of the catalytic efficiency of OPH over soman yet decreased its efficiency for paraoxon. In addition, comparative analysis of the molecular trajectories for OPH bound to soman and paraoxon suggests that binding of the latter facilitates the conformational transition of OPH from the open to the closed substate promoting a tighter binding of paraoxon.
Collapse
Affiliation(s)
- Diego E B Gomes
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21949-900, Brazil
| | | | | | | | | |
Collapse
|
41
|
Singh S, Kumar V, Singh P, Banerjee BD, Rautela RS, Grover SS, Rawat DS, Pasha ST, Jain SK, Rai A. Influence of CYP2C9, GSTM1, GSTT1 and NAT2 genetic polymorphisms on DNA damage in workers occupationally exposed to organophosphate pesticides. Mutat Res 2011; 741:101-8. [PMID: 22108250 DOI: 10.1016/j.mrgentox.2011.11.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 10/09/2011] [Accepted: 11/07/2011] [Indexed: 10/15/2022]
Abstract
Previous studies have revealed that organophosphate pesticides (OPs) are primarily metabolized by xenobiotic metabolizing enzymes (XMEs). Very few studies have explored genetic polymorphisms of XMEs and their association with DNA damage in pesticides-exposed workers. Present study was designed to determine the influence of CYP2C9, GSTM1, GSTT1 and NAT2 genetic polymorphisms on DNA damage in workers occupationally exposed to OPs. We examined 268 subjects including 134 workers occupationally exposed to OPs and an equal number of normal healthy controls. The DNA damage was evaluated using alkaline comet assay and genotyping was done using individual polymerase chain reaction (PCR) or polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Acetylcholinesterase and paraoxonase activity were found to be significantly lowered in workers as compared to control subjects which were analyzed as biomarkers of toxicity due to OPs exposure (p<0.001). Workers showed significantly higher DNA tail moment (TM) compared to control subjects (14.32±2.17 vs. 6.24±1.37 tail % DNA, p<0.001). GSTM1 null genotype was found to influence DNA TM in workers (p<0.05). DNA TM was also found to be increased with concomitant presence of NAT2 slow acetylation and CYP2C9*3/*3 or GSTM1 null genotypes (p<0.05). DNA TM was found increased in NAT2 slow acetylators with mild and heavy smoking habits in control subjects and workers, respectively (p<0.05). The results of this study suggest that GSTM1 null genotypes, and an association of NAT2 slow acetylation genotypes with CYP2C9*3/*3 or GSTM1 null genotypes may modulate DNA damage in workers occupationally exposed to OPs.
Collapse
Affiliation(s)
- Satyender Singh
- Division of Biochemistry & Biotechnology, National Centre for Disease Control, 22, Sham Nath Marg, Delhi 110054, India.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Kadriu B, Gocel J, Larson J, Guidotti A, Davis JM, Nambiar MP, Auta J. Absence of tolerance to the anticonvulsant and neuroprotective effects of imidazenil against DFP-induced seizure and neuronal damage. Neuropharmacology 2011; 61:1463-9. [PMID: 21903116 DOI: 10.1016/j.neuropharm.2011.08.043] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 08/15/2011] [Accepted: 08/24/2011] [Indexed: 11/18/2022]
Abstract
The clinical use of diazepam or midazolam to control organophosphate (OP) nerve agent-induced seizure activity is limited by their unwanted effects including sedation, amnesia, withdrawal, and anticonvulsant tolerance. Imidazenil is an imidazo-benzodiazepine derivative with high intrinsic efficacy and selectivity for α2-, α3-, and α5- but low intrinsic efficacy for α1-containing GABA(A) receptors. We have previously shown that imidazenil is more efficacious than diazepam at protecting rats and mice from diisopropyl fluorophosphate (DFP)-induced seizures and neuronal damage without producing sedation. In the present study, we compared the tolerance liability of imidazenil and diazepam to attenuate the seizure activity and neurotoxic effects of DFP. Rats received protracted (14 days) oral treatment with increasing doses of imidazenil (1-4 mg/kg), diazepam (5-20 mg/kg), or vehicle. Eighteen hours after the last dose of the protracted treatment schedule, rats were tested for anticonvulsant tolerance after a 30 min pretreatment with a single test dose of imidazenil (0.5 mg/kg) or diazepam (5 mg/kg) prior to a DFP challenge (1.5 mg/kg). The anticonvulsant (modified Racine score scale) and neuroprotective (fluoro-jade B staining) effects of diazepam were significantly reduced in protracted diazepam-treated animals whereas the effects of imidazenil were not altered in protracted imidazenil-treated animals. The present findings indicate that protracted imidazenil treatment does not produce tolerance to its protective action against the neurotoxic effects of OP exposure.
Collapse
Affiliation(s)
- Bashkim Kadriu
- The Psychiatric Institute, Department of Psychiatry, College of Medicine, University of Illinois at Chicago, 1601 W. Taylor St., Chicago, IL 60612, USA
| | | | | | | | | | | | | |
Collapse
|
43
|
Singh S, Kumar V, Vashisht K, Singh P, Banerjee BD, Rautela RS, Grover SS, Rawat DS, Pasha ST, Jain SK, Rai A. Role of genetic polymorphisms of CYP1A1, CYP3A5, CYP2C9, CYP2D6, and PON1 in the modulation of DNA damage in workers occupationally exposed to organophosphate pesticides. Toxicol Appl Pharmacol 2011; 257:84-92. [PMID: 21907728 DOI: 10.1016/j.taap.2011.08.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 08/12/2011] [Accepted: 08/22/2011] [Indexed: 12/13/2022]
Abstract
Organophosphate pesticides (OPs) are primarily metabolized by several xenobiotic metabolizing enzymes (XMEs). Very few studies have explored genetic polymorphisms of XMEs and their association with DNA damage in pesticide-exposed workers. The present study was designed to determine the role of genetic polymorphisms of CYP1A1, CYP3A5, CYP2C9, CYP2D6, and PON1 in the modulation of DNA damage in workers occupationally exposed to OPs. We examined 284 subjects including 150 workers occupationally exposed to OPs and 134 normal healthy controls. The DNA damage was evaluated using the alkaline comet assay and genotyping was done using PCR-RFLP. The results revealed that the PONase activity toward paraoxonase and AChE activity was found significantly lowered in workers as compared to control subjects (p<0.001). Workers showed significantly higher DNA damage compared to control subjects (14.37±2.15 vs. 6.24±1.37 tail% DNA, p<0.001). Further, the workers with CYP2D6*3PM and PON1 (QQ and MM) genotypes were found to have significantly higher DNA damage when compared to other genotypes (p<0.05). In addition, significant increase in DNA damage was also observed in workers with concomitant presence of certain CYP2D6 and PON1 (Q192R and L55M) genotypes which need further extensive studies. In conclusion, the results indicate that the PON1 and CYP2D6 genotypes can modulate DNA damage elicited by some OPs possibly through gene-environment interactions.
Collapse
Affiliation(s)
- Satyender Singh
- Division of Biochemistry & Biotechnology, National Centre for Disease Control 22, Sham Nath Marg, Delhi-110054, India
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Singh S, Kumar V, Singh P, Thakur S, Banerjee BD, Rautela RS, Grover SS, Rawat DS, Pasha ST, Jain SK, Rai A. Genetic polymorphisms of GSTM1, GSTT1 and GSTP1 and susceptibility to DNA damage in workers occupationally exposed to organophosphate pesticides. Mutat Res 2011; 725:36-42. [PMID: 21736951 DOI: 10.1016/j.mrgentox.2011.06.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 05/23/2011] [Accepted: 06/22/2011] [Indexed: 11/28/2022]
Abstract
GSTM1, T1 and P1 are important enzymes of glutathione S-transferases (GSTs), involved in the metabolism of many endogenous and exogenous compounds. Individual genetic variation in these metabolizing enzymes may influence the metabolism of their substrates. The present study was designed to determine the genotoxic effects using DNA damage and its association with GSTM1, GSTT1, and GSTP1 (Ile105Val) genetic polymorphisms in workers occupationally exposed to organophosphate pesticides (OPs). We examined 230 subjects including 115 workers occupationally exposed to OPs and an equal number of normal healthy controls. The DNA damage was evaluated using the alkaline comet assay and genotyping was done using individual PCR or PCR-RFLP. Significantly higher DNA tail moment (TM) was observed in workers as compared to control subjects (14.41 ± 2.25 vs. 6.36 ± 1.41 tail % DNA, p<0.001). The results revealed significantly higher DNA TM in workers with GSTM1 null genotype than those with GSTM1 positive (15.18 vs. 14.15 tail % DNA, p=0.03). A significantly higher DNA TM was also observed in workers with homozygous Ile-Ile GSTP1 genotype than heterozygous (Ile-Val) and mutant (Val-Val) GSTP1 genotype (p=0.02). In conclusion, the results show that null deletion of GSTM1 and homozygote wild GSTP1 genotype could be related to inter-individual differences in DNA damage arises from the gene-environment interactions in workers occupationally exposed to OPs.
Collapse
Affiliation(s)
- Satyender Singh
- Division of Biochemistry and Biotechnology, National Centre for Disease Control, 22, Sham Nath Marg, Delhi 110054, India
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Genovese RF, Benton BJ, Oubre JL, Fleming PJ, Jakubowski EM, Mioduszewski RJ. Evaluation of miosis, behavior and cholinesterase inhibition from low-level, whole-body vapor exposure to soman in African green monkeys (Chlorocebus sabeus). J Med Primatol 2011; 39:318-27. [PMID: 20412376 DOI: 10.1111/j.1600-0684.2010.00413.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Relatively little is known about the effects of very low-level exposures to nerve agents where few signs or symptoms are present. METHODS African green monkeys (Chlorocebus sabeus) (n = 8) were exposed for 10 min, whole-body, to a single concentration of soman (0.028-0.891 mg/m³). RESULTS EC₅₀ values for miosis were determined to be 0.055 mg/m³ and 0.132 mg/m³ when defined as a 50 percent reduction in pupil area and diameter, respectively. In general, performance on a serial probe recognition task remained unchanged at lower concentrations, but responding was suppressed at the largest concentration tested. Soman produced concentration-dependent inhibition of acetylcholinesterase activity and, to a lesser extent, butyrylcholinesterase activity. CONCLUSIONS These results characterize threshold soman exposure concentrations that produce miosis in the absence of other overt signs of toxicity and extend previous studies indicating that miosis is a valuable early indicator for the detection of soman vapor exposure.
Collapse
Affiliation(s)
- Raymond F Genovese
- Division of Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD 20910-7500, USA.
| | | | | | | | | | | |
Collapse
|
46
|
Nourmohammadian F, Wu T, Branda NR. A ‘chemically-gated’ photoresponsive compound as a visible detector for organophosphorus nerve agents. Chem Commun (Camb) 2011; 47:10954-6. [DOI: 10.1039/c1cc13685b] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
47
|
Determination of threshold adverse effect doses of percutaneous VX exposure in African green monkeys. Toxicology 2011; 279:65-72. [DOI: 10.1016/j.tox.2010.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2010] [Revised: 09/16/2010] [Accepted: 09/21/2010] [Indexed: 11/18/2022]
|
48
|
Valiyaveettil M, Alamneh Y, Biggemann L, Soojhawon I, Doctor BP, Nambiar MP. Efficient hydrolysis of the chemical warfare nerve agent tabun by recombinant and purified human and rabbit serum paraoxonase 1. Biochem Biophys Res Commun 2010; 403:97-102. [DOI: 10.1016/j.bbrc.2010.10.125] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Accepted: 10/26/2010] [Indexed: 11/16/2022]
|
49
|
Clavaguera S, Carella A, Caillier L, Celle C, Pécaut J, Lenfant S, Vuillaume D, Simonato JP. Sub-ppm Detection of Nerve Agents Using Chemically Functionalized Silicon Nanoribbon Field-Effect Transistors. Angew Chem Int Ed Engl 2010; 49:4063-6. [DOI: 10.1002/anie.201000122] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
50
|
Clavaguera S, Carella A, Caillier L, Celle C, Pécaut J, Lenfant S, Vuillaume D, Simonato JP. Sub-ppm Detection of Nerve Agents Using Chemically Functionalized Silicon Nanoribbon Field-Effect Transistors. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|