1
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Jaćević V, Grujić-Milanović J, Milovanović Z, Nežić L, Amidžić L, Vojinović N, Marković B, Dobričić V, Milosavljević P, Nepovimova E, Kuča K. Quantification of oxidative stress markers in the blood sera following subacute administration of different oximes in rats. Chem Biol Interact 2024; 399:111138. [PMID: 38992768 DOI: 10.1016/j.cbi.2024.111138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 06/25/2024] [Accepted: 07/06/2024] [Indexed: 07/13/2024]
Abstract
Oxidative stress status, as a disruption of redox homeostasis, in the blood sera of Wistar rats caused by repeated application of selected acetylcholinesterase reactivators - asoxime, obidoxime, K027, K048, K074, and K075 were evaluated. Throughout this study, each oxime in a dose of 0.1 of LD50/kg im was given 2x/week for 4 weeks. Then, seven days after the last oximes' application, markers of lipid peroxidation (malondialdehyde, MDA), and protein oxidation (advanced oxidation protein products, AOPP), as well as the activity of antioxidant enzymes (catalase, CAT, superoxide dismutase, SOD, reduced glutathione, GSH, and oxidized glutathione, GSSG), were determined. Oxidative stress parameters, MDA and AOPP were significantly highest in the K048-, K074- and K075-treated groups (p < 0.001). The activity of CAT was significantly elevated in the obidoxime-treated group (p < 0.05), while treatment with K027, K048, and K074 induced high elevation in SOD levels (p < 0.01, p < 0.001). Interestingly, the activity of GSH in each oxime-treated group was significantly elevated. Unlike, treatment with obidoxime caused elevation in GSSG levels (p < 0.01). As a continuation of our previously published data, these results assure that applied oximes following subacute treatment ameliorated the oxidative status and further adverse systemic toxic effects in rats.
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Affiliation(s)
- Vesna Jaćević
- Department for Experimental Toxicology and Pharmacology, National Poison Control Centre, Military Medical Academy, Crnotravska 17, 11040 Belgrade, Serbia; Medical Faculty of the Military Medical Academy, University of Defence, Crnotravska 17, 11040 Belgrade, Serbia; Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 500 03, Hradec Kralove, Czech Republic.
| | - Jelica Grujić-Milanović
- University of Belgrade - Institute for Medical Research, National Institute of the Republic of Serbia, Department for Cardiovascular Research, Dr Subotića 4, 11 132, Belgrade, Serbia
| | - Zoran Milovanović
- Special Police Unit, Ministry of Interior, Trebevićka 12/A, 11 030 Belgrade, Serbia
| | - Lana Nežić
- Department of Pharmacology, Toxicology and Clinical Pharmacology, Faculty of Medicine, University of Banja Luka, Save Mrkalja 14, 78000 Banja Luka, Bosnia and Herzegovina
| | - Ljiljana Amidžić
- Centre for Biomedical Research, Faculty of Medicine, University of Banja Luka, Save Mrkalja 14, 78000 Banja Luka, Bosnia and Herzegovina; Department of Human Genetics, Faculty of Medicine, University of Banja Luka, Save Mrkalja 14, 78000, Banja Luka, Bosnia and Herzegovina
| | - Nataša Vojinović
- Department of Human Genetics, Faculty of Medicine, University of Banja Luka, Save Mrkalja 14, 78000, Banja Luka, Bosnia and Herzegovina
| | - Bojan Marković
- University of Belgrade - Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Vojvode Stepe 450, 11121, Belgrade, Serbia
| | - Vladimir Dobričić
- University of Belgrade - Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Vojvode Stepe 450, 11121, Belgrade, Serbia
| | - Petar Milosavljević
- Veterinary Services Center, Military Health Department, Crnotravska 17, 11040, Belgrade, Serbia
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 500 03, Hradec Kralove, Czech Republic
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 500 03, Hradec Kralove, Czech Republic; Biomedical Research Center, University Hospital Hradec Kralove, 50005, Hradec Kralove, Czech Republic
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2
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Hashidoko A, Kitanosono T, Yamashita Y, Kobayashi S. Water vs. Organic Solvents: Water-Controlled Divergent Reactivity of 2-Substituted Indoles. Chem Asian J 2024:e202301045. [PMID: 38217396 DOI: 10.1002/asia.202301045] [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: 11/25/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/15/2024]
Abstract
Water is not a good solvent for most organic compounds, yet water can offer many benefits to some organic reactions, hence enriching organic chemistry. Herein, the unique divergent reactivity of 2-substituted indoles with ⋅NO sources is presented. The amount of water solvent was harnessed for a scalable, benign, and expedient synthesis of indolenine oximes, albeit with water's inability to dissolve the reactants. 2-Methoxyethyl nitrite, which has been tailored for reactions in water, empowered this protocol by enhancing the product selectivity. We further report on chemoselective transformations of the products that rely on their structural features. Our findings are expected to offer access to an underexplored chemical space. The platform is also applicable to oximinomalonate synthesis. Mechanistic studies revealed the important role of water in the reversal of stability between oxime and nitroso compounds, promoting the proton transfer.
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Affiliation(s)
- Airu Hashidoko
- Department of Chemistry, School of Science, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Taku Kitanosono
- Department of Chemistry, School of Science, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Yasuhiro Yamashita
- Department of Chemistry, School of Science, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Shū Kobayashi
- Department of Chemistry, School of Science, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
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3
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Váňová N, Múčková L, Kalíšková T, Lochman L, Bzonek P, Švec F. In Vitro Evaluation of Oxidative Stress Induced by Oxime Reactivators of Acetylcholinesterase in HepG2 Cells. Chem Res Toxicol 2023; 36:1912-1920. [PMID: 37950699 PMCID: PMC10731658 DOI: 10.1021/acs.chemrestox.3c00203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 10/27/2023] [Accepted: 10/31/2023] [Indexed: 11/13/2023]
Abstract
Oxime reactivators of acetylcholinesterase (AChE) are used as causal antidotes for intended and unintended poisoning by organophosphate nerve agents and pesticides. Despite all efforts to develop new AChE reactivators, none of these drug candidates replaced conventional clinically used oximes. In addition to the therapeutic efficacy, determining the safety profile is crucial in preclinical drug evaluation. The exact mechanism of oxime toxicity and the structure-toxicity relationship are subjects of ongoing research, with oxidative stress proposed as a possible mechanism. In the present study, we investigated four promising bispyridinium oxime AChE reactivators, K048, K074, K075, and K203, and their ability to induce oxidative stress in vitro. Cultured human hepatoma cells were exposed to oximes at concentrations corresponding to their IC50 values determined by the MTT assay after 24 h. Their potency to generate reactive oxygen species, interfere with the thiol antioxidant system, and induce lipid peroxidation was evaluated at 1, 4, and 24 h of exposure. Reactivators without a double bond in the four-carbon linker, K048 and K074, showed a greater potential to induce oxidative stress compared with K075 and K203, which contain a double bond. Unlike oximes with a three-carbon-long linker, the number of aldoxime groups attached to the pyridinium moieties does not determine the oxidative stress induction for K048, K074, K075, and K203 oximes. In conclusion, our results emphasize that the structure of oximes plays a critical role in inducing oxidative stress, and this relationship does not correlate with their cytotoxicity expressed as the IC50 value. However, it is important to note that oxidative stress cannot be disregarded as a potential contributor to the side effects associated with oximes.
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Affiliation(s)
- Nela Váňová
- Department
of Pharmaceutical Chemistry and Pharmaceutical Analysis, Faculty of
Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, Hradec
Králové 500 05, Czechia
| | - L’ubica Múčková
- Department
of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defence, Třebešská 1575, Hradec Králové 500 02, Czechia
| | - Tereza Kalíšková
- Department
of Pharmaceutical Chemistry and Pharmaceutical Analysis, Faculty of
Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, Hradec
Králové 500 05, Czechia
| | - Lukáš Lochman
- Department
of Pharmaceutical Chemistry and Pharmaceutical Analysis, Faculty of
Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, Hradec
Králové 500 05, Czechia
| | - Petr Bzonek
- Department
of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defence, Třebešská 1575, Hradec Králové 500 02, Czechia
| | - František Švec
- Department
of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, Hradec
Králové 500 05, Czechia
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4
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Prchalova E, Sukupova M, Malinak D, Andrys R, Sivak L, Pekarik V, Skarka A, Svobodova J, Prchal L, Fresser L, Heger Z, Musilek K. BODIPY-labelled acetylcholinesterase reactivators can be encapsulated into ferritin nanovehicles for enhanced bioavailability in the CNS. Biomed Pharmacother 2023; 167:115490. [PMID: 37722189 DOI: 10.1016/j.biopha.2023.115490] [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: 07/01/2023] [Revised: 09/08/2023] [Accepted: 09/08/2023] [Indexed: 09/20/2023] Open
Abstract
The BODIPY-labelled oxime reactivator was prepared and used to study its biodistribution into central nervous system. The newly synthesized oxime was found to be weak inhibitor of acetylcholinesterase and strong inhibitor of butyrylcholinesterase. Its reactivation ability for organophosphate inhibited acetylcholinesterase was found similar to a parent oxime. The BODIPY-labelled oxime was further encapsulated into recombinant human H-ferritin and evaluated in vitro and in vivo. The oxime or encapsulated oxime were found to be bioaccumulated primarily in liver and kidneys of mice, but some amount was distributed also to the brain, where it was detectable even after 24 h. The BODIPY-labelled oxime encapsulated to human H-ferritin showed better CNS bioaccumulation and tissue retention at 8 and 24 h time points compared to free oxime, although the fluorescence results might be biased due to BODIPY metabolites identified in tissue homogenates. Taken together, the study demonstrates the first utilization of recombinant ferritins for changing the unfavourable pharmacokinetics of oxime reactivators and brings promising results for follow-up studies.
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Affiliation(s)
- Eliska Prchalova
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Martina Sukupova
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic; Department of Experimental Biology, Faculty of Science, Masaryk University, CZ-625 00 Brno, Czech Republic
| | - David Malinak
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic; University Hospital in Hradec Kralove, Biomedical Research Centre, Sokolska 581, 500 05 Hradec Kralove, Czech Republic
| | - Rudolf Andrys
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Ladislav Sivak
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic
| | - Vladimir Pekarik
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic
| | - Adam Skarka
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Jana Svobodova
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Lukas Prchal
- University Hospital in Hradec Kralove, Biomedical Research Centre, Sokolska 581, 500 05 Hradec Kralove, Czech Republic
| | - Lukas Fresser
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Zbynek Heger
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic.
| | - Kamil Musilek
- University of Hradec Kralove, Faculty of Science, Department of Chemistry, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic.
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5
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Jokanović M, Oleksak P, Kuca K. Multiple neurological effects associated with exposure to organophosphorus pesticides in man. Toxicology 2023; 484:153407. [PMID: 36543276 DOI: 10.1016/j.tox.2022.153407] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/02/2022] [Accepted: 12/16/2022] [Indexed: 12/23/2022]
Abstract
This article reviews available data regarding the possible association of organophosphorus (OP) pesticides with neurological disorders such as dementia, attention deficit hyperactivity disorder, neurodevelopment, autism, cognitive development, Parkinson's disease and chronic organophosphate-induced neuropsychiatric disorder. These effects mainly develop after repeated (chronic) human exposure to low doses of OP. In addition, three well defined neurotoxic effects in humans caused by single doses of OP compounds are discussed. Those effects are the cholinergic syndrome, the intermediate syndrome and organophosphate-induced delayed polyneuropathy. Usually, the poisoning can be avoided by an improved administrative control, limited access to OP pesticides, efficient measures of personal protection and education of OP pesticide applicators and medical staff.
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Affiliation(s)
- Milan Jokanović
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech republic
| | - Patrik Oleksak
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech republic
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech republic; Biomedical Research Center, University Hospital Hradec Kralove, Hradec Kralove, Czech republic.
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6
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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.
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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.
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7
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Zhang Y, Li T, Zhang Y, Sun X, Liu H, Wang Y, Nie Z. Acetylcholinesterase-capped mesoporous silica gated switches for selective detection of high-toxicity organophosphate compounds. Anal Chim Acta 2022; 1207:339708. [DOI: 10.1016/j.aca.2022.339708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 03/06/2022] [Accepted: 03/08/2022] [Indexed: 11/25/2022]
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8
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Zorbaz T, Malinak D, Hofmanova T, Maraković N, Žunec S, Hrvat NM, Andrys R, Psotka M, Zandona A, Svobodova J, Prchal L, Fingler S, Katalinić M, Kovarik Z, Musilek K. Halogen substituents enhance oxime nucleophilicity for reactivation of cholinesterases inhibited by nerve agents. Eur J Med Chem 2022; 238:114377. [DOI: 10.1016/j.ejmech.2022.114377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/28/2022] [Accepted: 04/09/2022] [Indexed: 11/03/2022]
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9
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Sun Y, Wei J, Zou J, Cheng Z, Huang Z, Gu L, Zhong Z, Li S, Wang Y, Li P. Electrochemical detection of methyl-paraoxon based on bifunctional cerium oxide nanozyme with catalytic activity and signal amplification effect. J Pharm Anal 2021; 11:653-660. [PMID: 34765279 PMCID: PMC8572677 DOI: 10.1016/j.jpha.2020.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 09/03/2020] [Accepted: 09/03/2020] [Indexed: 11/29/2022] Open
Abstract
A new electrochemical sensor for organophosphate pesticide (methyl-paraoxon) detection based on bifunctional cerium oxide (CeO2) nanozyme is here reported for the first time. Methyl-paraoxon was degraded into p-nitrophenol by using CeO2 with phosphatase mimicking activity. The CeO2 nanozyme-modified electrode was then synthesized to detect p-nitrophenol. Cyclic voltammetry was applied to investigate the electrochemical behavior of the modified electrode, which indicates that the signal enhancement effect may attribute to the coating of CeO2 nanozyme. The current research also studied and discussed the main parameters affecting the analytical signal, including accumulation potential, accumulation time, and pH. Under the optimum conditions, the present method provided a wider linear range from 0.1 to 100 μmol/L for methyl-paraoxon with a detection limit of 0.06 μmol/L. To validate the proof of concept, the electrochemical sensor was then successfully applied for the determination of methyl-paraoxon in three herb samples, i.e., Coix lacryma-jobi, Adenophora stricta and Semen nelumbinis. Our findings may provide new insights into the application of bifunctional nanozyme in electrochemical detection of organophosphorus pesticide. A new electrochemical method for methyl-paraoxon detection by using bifunctional nanozyme was presented. The cerium oxide nanozyme modified glassy carbon electrode was prepared to improve the sensitivity. The developed method has been successfully applied in three herbal plant samples.
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Affiliation(s)
- Yuzhou Sun
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China
| | - Jinchao Wei
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China.,Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, Guangzhou, 510632, China
| | - Jian Zou
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, Guangzhou, 510632, China.,Integrated Chinese and Western Medicine Postdoctoral Research Station, Jinan University, Guangzhou, 510632, China
| | - Zehua Cheng
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China
| | - Zhongming Huang
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, 999077, China
| | - Liqiang Gu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China
| | - Zhangfeng Zhong
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China
| | - Shengliang Li
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, 999077, China
| | - Yitao Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China
| | - Peng Li
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China
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10
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Bennion BJ, Malfatti MA, Be NA, Enright HA, Hok S, Cadieux CL, Carpenter TS, Lao V, Kuhn EA, McNerney MW, Lightstone FC, Nguyen TH, Valdez CA. Development of a CNS-permeable reactivator for nerve agent exposure: an iterative, multi-disciplinary approach. Sci Rep 2021; 11:15567. [PMID: 34330964 PMCID: PMC8324913 DOI: 10.1038/s41598-021-94963-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 07/19/2021] [Indexed: 11/09/2022] Open
Abstract
Nerve agents have experienced a resurgence in recent times with their use against civilian targets during the attacks in Syria (2012), the poisoning of Sergei and Yulia Skripal in the United Kingdom (2018) and Alexei Navalny in Russia (2020), strongly renewing the importance of antidote development against these lethal substances. The current standard treatment against their effects relies on the use of small molecule-based oximes that can efficiently restore acetylcholinesterase (AChE) activity. Despite their efficacy in reactivating AChE, the action of drugs like 2-pralidoxime (2-PAM) is primarily limited to the peripheral nervous system (PNS) and, thus, provides no significant protection to the central nervous system (CNS). This lack of action in the CNS stems from their ionic nature that, on one end makes them very powerful reactivators and on the other renders them ineffective at crossing the Blood Brain Barrier (BBB) to reach the CNS. In this report, we describe the use of an iterative approach composed of parallel chemical and in silico syntheses, computational modeling, and a battery of detailed in vitro and in vivo assays that resulted in the identification of a promising, novel CNS-permeable oxime reactivator. Additional experiments to determine acute and chronic toxicity are ongoing.
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Affiliation(s)
- Brian J Bennion
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Michael A Malfatti
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Nicholas A Be
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Heather A Enright
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Saphon Hok
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- Forensic Science Center, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - C Linn Cadieux
- United States Army Medical Research Institute of Chemical Defense, Aberdeen, MD, 21010, USA
| | - Timothy S Carpenter
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Victoria Lao
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Edward A Kuhn
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - M Windy McNerney
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- Affiliation: Mental Illness Research, Education and Clinical Center, Veterans Affairs, Palo Alto, CA, 94304, USA
- Affiliation: Department of Psychiatry, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Felice C Lightstone
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Tuan H Nguyen
- Global Security Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Carlos A Valdez
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA.
- Forensic Science Center, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA.
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11
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12
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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.
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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
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Lorke DE, Nurulain SM, Hasan MY, Kuča K, Petroianu GA. Experimental and Established Oximes as Pretreatment before Acute Exposure to Azinphos-Methyl. Int J Mol Sci 2021; 22:3072. [PMID: 33802843 PMCID: PMC8002820 DOI: 10.3390/ijms22063072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 03/01/2021] [Accepted: 03/01/2021] [Indexed: 11/18/2022] Open
Abstract
Poisoning with organophosphorus compounds (OPCs) represents an ongoing threat to civilians and rescue personal. We have previously shown that oximes, when administered prophylactically before exposure to the OPC paraoxon, are able to protect from its toxic effects. In the present study, we have assessed to what degree experimental (K-27; K-48; K-53; K-74; K-75) or established oximes (pralidoxime, obidoxime), when given as pretreatment at an equitoxic dosage of 25% of LD01, are able to reduce mortality induced by the OPC azinphos-methyl. Their efficacy was compared with that of pyridostigmine, the only FDA-approved substance for such prophylaxis. Efficacy was quantified in rats by Cox analysis, calculating the relative risk of death (RR), with RR=1 for the reference group given only azinphos-methyl, but no prophylaxis. All tested compounds significantly (p ≤ 0.05) reduced azinphos-methyl-induced mortality. In addition, the efficacy of all tested experimental and established oximes except K-53 was significantly superior to the FDA-approved compound pyridostigmine. Best protection was observed for the oximes K-48 (RR = 0.20), K-27 (RR = 0.23), and obidoxime (RR = 0.21), which were significantly more efficacious than pralidoxime and pyridostigmine. The second-best group of prophylactic compounds consisted of K-74 (RR = 0.26), K-75 (RR = 0.35) and pralidoxime (RR = 0.37), which were significantly more efficacious than pyridostigmine. Pretreatment with K-53 (RR = 0.37) and pyridostigmine (RR = 0.52) was the least efficacious. Our present data, together with previous results on other OPCs, indicate that the experimental oximes K-27 and K-48 are very promising pretreatment compounds. When penetration into the brain is undesirable, obidoxime is the most efficacious prophylactic agent already approved for clinical use.
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Affiliation(s)
- Dietrich E. Lorke
- Department of Anatomy and Cellular Biology, College of Medicine and Health Sciences, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
- Center for Biotechnology, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates
| | - Syed M. Nurulain
- Bio Science Department, COMSATS Institute of Information Technology, Bio Sciences Block, CUI, Park Road, Tarlai Kalan, Islamabad 45550, Pakistan;
| | - Mohamed Y. Hasan
- Department of Pharmacology & Therapeutics, College of Medicine and Health Sciences, UAE University, Al Ain P.O. Box 15551, United Arab Emirates;
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanského 62/26, 500 03 Hradec Kralove, Czech Republic;
| | - Georg A. Petroianu
- Department of Pharmacology, College of Medicine and Health Sciences, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates;
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Handl J, Malinak D, Capek J, Andrys R, Rousarova E, Hauschke M, Bruckova L, Cesla P, Rousar T, Musilek K. Effects of Charged Oxime Reactivators on the HK-2 Cell Line in Renal Toxicity Screening. Chem Res Toxicol 2021; 34:699-703. [PMID: 33566584 DOI: 10.1021/acs.chemrestox.0c00489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Oxime cholinesterase reactivators (oximes) are used to counteract organophosphate intoxication. Charged oximes are administered via intramuscular or intravenous injection when the majority of dose is unmetabolized and is excreted as urine. In this study, the effects of selected double charged oximes were determined in the HK-2 cell line as a model for renal toxicity screening. Some effects on dehydrogenase activity were found for obidoxime, asoxime (syn. HI-6), K027, and K203. The effects of K868 and K869 were found to be unreliable due to rapid degradation of both chlorinated oximes in the assay medium, resulting for K868 in an isoxazole-pyridinium product.
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Affiliation(s)
- Jiri Handl
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - David Malinak
- Faculty of Science, Department of Chemistry, University of Hradec Kralove, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Jan Capek
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Rudolf Andrys
- Faculty of Science, Department of Chemistry, University of Hradec Kralove, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
| | - Erika Rousarova
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Martina Hauschke
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Lenka Bruckova
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Petr Cesla
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Tomas Rousar
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Kamil Musilek
- Faculty of Science, Department of Chemistry, University of Hradec Kralove, Rokitanskeho 62, 500 03 Hradec Kralove, Czech Republic
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Vanova N, Hojna A, Pejchal J, Herman D, Malinak D, Prchalova E, Musilek K, Karasova JZ. Determination of K869, a Novel Oxime Reactivator of Acetylcholinesterase, in Rat Body Fluids and Tissues by Liquid-Chromatography Methods: Pharmacokinetic Study. J Pharm Sci 2021; 110:1842-1852. [PMID: 33545185 DOI: 10.1016/j.xphs.2021.01.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 01/29/2021] [Accepted: 01/29/2021] [Indexed: 10/22/2022]
Abstract
Oxime reactivators of acetylcholinesterase (AChE) represent an integral part of standard antidote treatment of organophosphate poisoning. Oxime K869 is a novel bisquaternary non-symmetric pyridinium aldoxime with two pyridinium rings connected by a tetramethylene bridge where two chlorines modify the pyridinium ring bearing the oxime moiety. Based on in vitro assays, K869 is a potent AChE and butyrylcholinesterase (BChE) reactivator. For the investigation of the basic pharmacokinetic properties of K869 after its intramuscular application, new HPLC-UV and LC-MS/MS methods were developed and validated for its determination in rat body fluids and tissues. In this study, the SPE procedure for sample pretreatment was optimized as an alternative to routine protein precipitation widely used in oxime pharmacokinetics studies. K869 oxime is quickly absorbed into the central compartment reaching its maximum in plasma (39 ± 4 μg/mL) between 15 and 20 min. The majority of K869 was eliminated by kidneys via urine when compared with biliary excretion. However, only a limited amount of K869 (65 ± 4 ng/g of brain tissue) was found in the brain 30 min after oxime administration. Regarding the brain/plasma ratio calculated (less than 1%), the penetration of K869 into the brain did not exceed conventionally used oximes.
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Affiliation(s)
- Nela Vanova
- Department of Pharmaceutical Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy in Hradec Kralove, Charles University, Czech Republic.
| | - Anna Hojna
- Department of Pharmaceutical Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy in Hradec Kralove, Charles University, Czech Republic
| | - Jaroslav Pejchal
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defense, Czech Republic
| | - David Herman
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defense, Czech Republic
| | - David Malinak
- Faculty of Science, Department of Chemistry, University of Hradec Kralove, Hradec Kralove, Czech Republic; University Hospital Hradec Kralove, Biomedical Research Centre, Hradec Kralove, Czech Republic
| | - Eliska Prchalova
- Faculty of Science, Department of Chemistry, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Kamil Musilek
- Faculty of Science, Department of Chemistry, University of Hradec Kralove, Hradec Kralove, Czech Republic; University Hospital Hradec Kralove, Biomedical Research Centre, Hradec Kralove, Czech Republic
| | - Jana Zdarova Karasova
- Department of Toxicology and Military Pharmacy, Faculty of Military Health Sciences, University of Defense, Czech Republic; University Hospital Hradec Kralove, Biomedical Research Centre, Hradec Kralove, Czech Republic
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16
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Thakur A, Patil P, Sharma A, Flora S. Advances in the Development of Reactivators for the Treatment of Organophosphorus Inhibited Cholinesterase. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999201020203544] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Organophosphorus Compounds (OPCs) are used as pesticides to control pest, as
chemical weapons in military conflict and unfortunately in the terrorist attack. These compounds
are irreversible inhibitors of acetylcholinesterase, resulting in the accumulation of
acetylcholine that leads to severe health complications which may be ended with the death of
the victim. Current antidotes used for reactivation of organophosphorus inhibited acetylcholinesterase
(OP-AChE) are not able to cross the blood-brain barrier efficiently, therefore being
incapable to reactivate OP-AChE of the central nervous system. Due to limitations with
current antidotes, there is an urgent need for new effective antidotes that could be included in
the treatment regimen of OP poisoning. In this direction, comprehensive work has been done
to improve the permeability of existing antidotes using a variety of strategies that include
synthesis of oxime bonded to peripheral site binding moiety via an alkyl, aryl, or heteroatom-containing linker, synthesis
of sugar oximes, and prodrug of 2-PAM, incorporating fluorine and chlorine in the structure of charged oximes.
Other classes of compounds such as the mannich base, N-substituted hydroxyimino acetamide, alkylating
agents, have been investigated for reactivation of OP-AChE. This review comprises the development of various
classes of reactivators with the aim of either enhancing blood-brain permeability of existing antidotes or discovering
a new class of reactivators.
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Affiliation(s)
- Ashima Thakur
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Raebareli, India
| | - Pooja Patil
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Raebareli, India
| | - Abha Sharma
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Raebareli, India
| | - S.J.S. Flora
- Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Raebareli, India
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17
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Yerri J, Dias J, Nimmakayala MR, Razafindrainibe F, Courageux C, Gastellier A, Jegoux J, Coisne C, Landry C, Gosselet F, Hachani J, Goossens J, Dehouck M, Nachon F, Baati R. Chemoselective Hydrogenation of 6‐Alkynyl‐3‐fluoro‐2‐pyridinaldoximes: Access to First‐in‐Class 6‐Alkyl‐3‐Fluoro‐2‐pyridinaldoxime Scaffolds as New Reactivators of Sarin‐Inhibited Human Acetylcholinesterase with Increased Blood–Brain Barrier Permeability. Chemistry 2020; 26:15035-15044. [DOI: 10.1002/chem.202002012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Jagadeesh Yerri
- ICPEES UMR CNRS 7515 Institut de Chimie des Procédés, pour l'Energie, l'Environnement, et la Santé 25 Rue Becquerel 67087 Strasbourg France
| | - José Dias
- Département de Toxicologie et Risques Chimiques Institut de Recherche Biomédicale des Armées 91220 Brétigny-sur-Orge France
| | - Mallikajurna Reddy Nimmakayala
- ICPEES UMR CNRS 7515 Institut de Chimie des Procédés, pour l'Energie, l'Environnement, et la Santé 25 Rue Becquerel 67087 Strasbourg France
| | - Franck Razafindrainibe
- ICPEES UMR CNRS 7515 Institut de Chimie des Procédés, pour l'Energie, l'Environnement, et la Santé 25 Rue Becquerel 67087 Strasbourg France
| | - Charlotte Courageux
- Département de Toxicologie et Risques Chimiques Institut de Recherche Biomédicale des Armées 91220 Brétigny-sur-Orge France
| | - Anne‐Julie Gastellier
- Département de Toxicologie et Risques Chimiques Institut de Recherche Biomédicale des Armées 91220 Brétigny-sur-Orge France
| | - Johanne Jegoux
- Département de Toxicologie et Risques Chimiques Institut de Recherche Biomédicale des Armées 91220 Brétigny-sur-Orge France
| | - Caroline Coisne
- UR 2465 Laboratoire de la Barrière Hémato-Encéphalique (LBHE) Université d'Artois (UArtois) 62307 Lens France
| | - Christophe Landry
- UR 2465 Laboratoire de la Barrière Hémato-Encéphalique (LBHE) Université d'Artois (UArtois) 62307 Lens France
| | - Fabien Gosselet
- UR 2465 Laboratoire de la Barrière Hémato-Encéphalique (LBHE) Université d'Artois (UArtois) 62307 Lens France
| | - Johan Hachani
- UR 2465 Laboratoire de la Barrière Hémato-Encéphalique (LBHE) Université d'Artois (UArtois) 62307 Lens France
| | - Jean‐François Goossens
- ULR 7365—GRITA—Groupe de Recherche sur les Formes, Injectables et Technologies Associées University of Lille 59000 Lille France
| | - Marie‐Pierre Dehouck
- UR 2465 Laboratoire de la Barrière Hémato-Encéphalique (LBHE) Université d'Artois (UArtois) 62307 Lens France
| | - Florian Nachon
- Département de Toxicologie et Risques Chimiques Institut de Recherche Biomédicale des Armées 91220 Brétigny-sur-Orge France
| | - Rachid Baati
- ICPEES UMR CNRS 7515 Institut de Chimie des Procédés, pour l'Energie, l'Environnement, et la Santé 25 Rue Becquerel 67087 Strasbourg France
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18
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Understanding the Interaction Modes and Reactivity of Trimedoxime toward MmAChE Inhibited by Nerve Agents: Theoretical and Experimental Aspects. Int J Mol Sci 2020; 21:ijms21186510. [PMID: 32899591 PMCID: PMC7554915 DOI: 10.3390/ijms21186510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 08/31/2020] [Accepted: 09/02/2020] [Indexed: 11/17/2022] Open
Abstract
Organophosphorus (OP) compounds are used as both chemical weapons and pesticides. However, these agents are very dangerous and toxic to humans, animals, and the environment. Thus, investigations with reactivators have been deeply developed in order to design new antidotes with better efficiency, as well as a greater spectrum of action in the acetylcholinesterase (AChE) reactivation process. With that in mind, in this work, we investigated the behavior of trimedoxime toward the Mus musculus acetylcholinesterase (MmAChE) inhibited by a range of nerve agents, such as chemical weapons. From experimental assays, reactivation percentages were obtained for the reactivation of different AChE–OP complexes. On the other hand, theoretical calculations were performed to assess the differences in interaction modes and the reactivity of trimedoxime within the AChE active site. Comparing theoretical and experimental data, it is possible to notice that the oxime, in most cases, showed better reactivation percentages at higher concentrations, with the best result for the reactivation of the AChE–VX adduct. From this work, it was revealed that the mechanistic process contributes most to the oxime efficiency than the interaction in the site. In this way, this study is important to better understand the reactivation process through trimedoxime, contributing to the proposal of novel antidotes.
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Safety and Efficacy of New Oximes to Reverse Low Dose Diethyl-Paraoxon-Induced Ventilatory Effects in Rats. Molecules 2020; 25:molecules25133056. [PMID: 32635368 PMCID: PMC7411965 DOI: 10.3390/molecules25133056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 06/30/2020] [Accepted: 07/02/2020] [Indexed: 12/31/2022] Open
Abstract
Background: Oximes are used in addition to atropine to treat organophosphate poisoning. However, the efficiency of oximes is still a matter of debate. In vitro experiments suggested than new oximes are more potent than the commercial oximes. However, the antidotal activity of new oximes has not been assessed in vivo. Methods: The aim of this work was to assess the safety and efficiency of new oximes compared to pralidoxime in a rat model of diethyl paraoxon-induced non-lethal respiratory toxicity. Results: Safety study of oximes showed no adverse effects on ventilation in rats. KO-33, KO-48, KO-74 oximes did not exhibit significant antidotal effect in vivo. In contrast, KO-27 and BI-6 showed evidence of antidotal activity by normalization of respiratory frequency and respiratory times. KO-27 became inefficient only during the last 30 min of the study. In contrast, pralidoxime demonstrated to be inefficient at 30 min post injection. Inversely, the antidotal activity of BI-6 occurred lately, within the last 90 min post injection. Conclusion: This study showed respiratory safety of new oximes. Regarding, the efficiency, KO-27 revealed to be a rapid acting antidote toward diethylparaoxon-induced respiratory toxicity, meanwhile BI-6 was a late-acting antidote. Simultaneous administration of these two oximes might result in a complete and prolonged antidotal efficiency.
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Combined Pre- and Posttreatment of Paraoxon Exposure. Molecules 2020; 25:molecules25071521. [PMID: 32230733 PMCID: PMC7180863 DOI: 10.3390/molecules25071521] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 03/19/2020] [Accepted: 03/25/2020] [Indexed: 02/01/2023] Open
Abstract
AIMS Organophosphates (OPCs), useful agents as pesticides, also represent a serious health hazard. Standard therapy with atropine and established oxime-type enzyme reactivators is unsatisfactory. Experimental data indicate that superior therapeutic results can be obtained when reversible cholinesterase inhibitors are administered before OPC exposure. Comparing the protective efficacy of five such cholinesterase inhibitors (physostigmine, pyridostigmine, ranitidine, tacrine, or K-27), we observed best protection for the experimental oxime K-27. The present study was undertaken in order to determine if additional administration of K-27 immediately after OPC (paraoxon) exposure can improve the outcome. METHODS Therapeutic efficacy was assessed in rats by determining the relative risk of death (RR) by Cox survival analysis over a period of 48 h. Animals that received only pretreatment and paraoxon were compared with those that had received pretreatment and paraoxon followed by K-27 immediately after paraoxon exposure. RESULTS Best protection from paraoxon-induced mortality was observed after pretreatment with physostigmine (RR = 0.30) and K-27 (RR = 0.34). Both substances were significantly more efficacious than tacrine (RR = 0.67), ranitidine (RR = 0.72), and pyridostigmine (RR = 0.76), which were less efficacious but still significantly reduced the RR compared to the no-treatment group (paraoxon only). Additional administration of K-27 immediately after paraoxon exposure (posttreatment) did not further reduce mortality. Statistical analysis between pretreatment before paraoxon exposure alone and pretreatment plus K-27 posttreatment did not show any significant difference for any of the pretreatment regimens. CONCLUSIONS Best outcome is achieved if physostigmine or K-27 are administered prophylactically before exposure to sublethal paraoxon dosages. Therapeutic outcome is not further improved by additional oxime therapy immediately thereafter.
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Faiz Norrrahim MN, Idayu Abdul Razak MA, Ahmad Shah NA, Kasim H, Wan Yusoff WY, Halim NA, Mohd Nor SA, Jamal SH, Ong KK, Zin Wan Yunus WM, Knight VF, Mohd Kasim NA. Recent developments on oximes to improve the blood brain barrier penetration for the treatment of organophosphorus poisoning: a review. RSC Adv 2020; 10:4465-4489. [PMID: 35495228 PMCID: PMC9049292 DOI: 10.1039/c9ra08599h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 12/16/2019] [Indexed: 11/25/2022] Open
Abstract
Organophosphorus (OP) compounds are highly toxic synthetic compounds which have been used as pesticides and developed as warfare nerve agents. They represent a threat to both military and civilian populations. OP pesticides affect the nervous system and are thought to have caused at least 5 million deaths since their discovery in the 1930s. At present the treatment of OP nerve agent poisoning commonly involves the use of parenteral oximes. However, the blood brain barrier (BBB) remains a challenge in the delivery of oximes to the central nervous system (CNS). This is because almost all macromolecule drugs (including oximes) fail to pass through the BBB to reach the CNS structures. The presence of a permanent cationic charge in oximes has made these compounds inefficient in crossing the BBB. Thus, oximes are unable to reactivate acetylcholinesterase (AChE) in the CNS. Using current structural and mechanistic understanding of the BBB under both physiological and pathological conditions, it becomes possible to design delivery systems for oximes and other drugs that are able to cross the BBB effectively. This review summarises the recent strategies in the development of oximes which are capable of crossing the BBB to treat OP poisoning. Several new developments using oximes are reviewed along with their advantages and disadvantages. This review could be beneficial for future directions in the development of oxime and other drug delivery systems into the CNS. Organophosphorus (OP) compounds are highly toxic synthetic compounds which have been used as pesticides and developed as warfare nerve agents.![]()
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Jaćević V, Nepovimova E, Kuča K. Acute Toxic Injuries of Rat's Visceral Tissues Induced by Different Oximes. Sci Rep 2019; 9:16425. [PMID: 31712702 PMCID: PMC6848205 DOI: 10.1038/s41598-019-52768-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 10/23/2019] [Indexed: 12/27/2022] Open
Abstract
Certain AChE reactivators, asoxime, obidoxime, K027, K048, and K075, when taken in overdoses and sometimes even when introduced within therapeutic ranges, may injure the different organs. As a continuation of previously published data, in this study, Wistar rats have sacrificed 24 hrs and 7 days after single im application of 0.1LD50, 0.5LD50 and 1.0LD50 of each reactivator, and examinated tissue samples were obtained for pathohistological and semiquantitative analysis. A severity of tissue alteration, expressed as different tissue damage scores were evaluated. Morphological structure of examinated tissues treated with of 0.1LD50 of all reactivators was comparable with the control group of rats. Moderate injuries were seen in visceral tissues treated with 0.5LD50 of asoxime, obidoxime and K027. Acute damages were enlarged after treatment with 0.5LD50 and 1.0LD50 of all reactivators during the next 7 days. The most prominent changes were seen in rats treated with 1.0LD50 of K048 and K075 (P < 0.001 vs. control and asoxime-treated group). All reactivators given by a single, high, unitary dose regimen, have an adverse effect not only on the main visceral tissue, but on the whole rat as well, but the exact mechanism of cellular injury remains to be confirmed in further investigation.
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Affiliation(s)
- Vesna Jaćević
- National Poison Control Centre, Military Medical Academy, Belgrade, Serbia.,Faculty of Medicine of the Military Medical Academy, University of Defense, Belgrade, Serbia.,Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czechia
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czechia
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czechia.
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