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Supramolecular liquid barrier for sulfur mustard utilizing host-guest complexation of pillar[5]arene with triethylene oxide substituents. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.07.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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2
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Gilardoni M, Léonço D, Caffin F, Gros-Désormeaux F, Eldin C, Béal D, Ouzia S, Junot C, Fenaille F, Piérard C, Douki T. Evidence for the systemic diffusion of (2-chloroethyl)-ethyl-sulfide, a sulfur mustard analog, and its deleterious effects in brain. Toxicology 2021; 462:152950. [PMID: 34534560 DOI: 10.1016/j.tox.2021.152950] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/03/2021] [Accepted: 09/09/2021] [Indexed: 10/20/2022]
Abstract
Sulfur mustard, a chemical warfare agent known to be a vesicant of skin, readily diffuses in the blood stream and reaches internal organs. In the present study, we used the analog (2-chloroethyl)-ethyl-sulfide (CEES) to provide novel data on the systemic diffusion of vesicants and on their ability to induce brain damage, which result in neurological disorders. SKH-1 hairless mice were topically exposed to CEES and sacrificed at different time until 14 days after exposure. A plasma metabolomics study showed a strong systemic impact following a self-protection mechanism to alleviate the injury of CEES exposure. This result was confirmed by the quantification of specific biomarkers in plasma. Those were the conjugates of CEES with glutathione (GSH-CEES), cysteine (Cys-CEES) and N-acetyl-cysteine (NAC-CEES), as well as the guanine adduct (N7Gua-CEES). In brain, N7Gua-CEES could be detected both in DNA and in organ extracts. Similarly, GSH-CEES, Cys-CEES and NAC-CEES were present in the extracts until day14. Altogether, these results, based on novel exposure markers, confirm the ability of vesicants to induce internal damage following dermal exposure. The observation of alkylation damage to glutathione and DNA in brain provides an additional mechanism to the neurological insult of SM.
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Affiliation(s)
- Marie Gilardoni
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, F-38000, Grenoble, France
| | - Daniel Léonço
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191, Gif sur Yvette, France
| | - Fanny Caffin
- Institut de Recherche Biomédicale des Armées (IRBA), Place Général Valérie André, BP 73, 91223, Brétigny-sur-Orge Cedex, France
| | - Fanny Gros-Désormeaux
- Institut de Recherche Biomédicale des Armées (IRBA), Place Général Valérie André, BP 73, 91223, Brétigny-sur-Orge Cedex, France
| | - Camille Eldin
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, F-38000, Grenoble, France
| | - David Béal
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, F-38000, Grenoble, France
| | - Sadia Ouzia
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191, Gif sur Yvette, France
| | - Christophe Junot
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191, Gif sur Yvette, France
| | - François Fenaille
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191, Gif sur Yvette, France
| | - Christophe Piérard
- Institut de Recherche Biomédicale des Armées (IRBA), Place Général Valérie André, BP 73, 91223, Brétigny-sur-Orge Cedex, France
| | - Thierry Douki
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, F-38000, Grenoble, France.
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Absorption of surfactant-laden droplets into porous media: A numerical study. J Colloid Interface Sci 2021; 597:149-159. [PMID: 33866208 DOI: 10.1016/j.jcis.2021.03.119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/19/2021] [Accepted: 03/20/2021] [Indexed: 01/26/2023]
Abstract
HYPOTHESIS Droplets can absorb into permeable substrates due to capillarity. It is hypothesized that the contact line dynamics influence this process and that an unpinned contact line results in slower absorption than a pinned contact line, since the contact area between the droplet and the substrate will decrease over time for the former. Furthermore, it is expected that surfactants can be used to accelerate the absorption. SIMULATIONS Lubrication theory is employed to model the droplet and Darcy's law is combined with the conservation law of mass to describe the absorption dynamics. For the surfactant transport, several convection-diffusion-adsorption equations are solved. FINDINGS It is found that moving contact lines result in a parabola-shaped wetted area and a slower absorption and a deeper penetration depth than pinned contact lines. The evolution of the penetration depth was quantitatively validated by comparison with two experimental studies from literature. Surfactants were shown to accelerate the absorption process, but only if their adsorption kinetics are slow compared to the absorption. Otherwise, all surfactant adsorbs onto the pore walls before reaching the wetting front, resulting in the same absorption rate as without surfactants. This behavior agrees with both experimental and analytical literature.
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Sawyer TW. N-Acetylcysteine as a treatment for sulphur mustard poisoning. Free Radic Biol Med 2020; 161:305-320. [PMID: 32980537 PMCID: PMC7516373 DOI: 10.1016/j.freeradbiomed.2020.09.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 09/04/2020] [Accepted: 09/20/2020] [Indexed: 01/18/2023]
Abstract
In the long and intensive search for effective treatments to counteract the toxicity of the chemical warfare (CW) agent sulphur mustard (H; bis(2-chloroethyl) sulphide), the most auspicious and consistent results have been obtained with the drug N-acetylcysteine (NAC), particularly with respect to its therapeutic use against the effects of inhaled H. It is a synthetic cysteine derivative that has been used in a wide variety of clinical applications for decades and a wealth of information exists on its safety and protective properties against a broad range of toxicants and disease states. Its primary mechanism of action is as a pro-drug for the synthesis of the antioxidant glutathione (GSH), particularly in those circumstances where oxidative stress has exhausted intracellular GSH stores. It impacts a number of pathways either directly or through its GSH-related antioxidant and anti-inflammatory properties, which make it a prime candidate as a potential treatment for the wide range of deleterious cellular effects that H is acknowledged to cause in exposed individuals. This report reviews the available literature on the protection afforded by NAC against the toxicity of H in a variety of model systems, including its efficacy in treating the long-term chronic lung effects of H that have been demonstrated in Iranian veterans exposed during the Iran-Iraq War (1980-1988). Although there is overwhelming evidence supporting this drug as a potential medical countermeasure against this CW agent, there is a requirement for carefully controlled clinical trials to determine the safety, efficacy and optimal NAC dosage regimens for the treatment of inhaled H.
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Affiliation(s)
- Thomas W Sawyer
- Defence Research & Development Canada, Suffield Research Centre, Box 4000, Medicine Hat, Alberta, T1A 8K6, Canada.
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Spiandore M, Souilah-Edib M, Piram A, Lacoste A, Josse D, Doumenq P. Desorption of sulphur mustard simulants methyl salicylate and 2-chloroethyl ethyl sulphide from contaminated scalp hair after vapour exposure. CHEMOSPHERE 2018; 191:721-728. [PMID: 29078194 DOI: 10.1016/j.chemosphere.2017.09.124] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 09/15/2017] [Accepted: 09/26/2017] [Indexed: 06/07/2023]
Abstract
Chemical warfare agents have been used to incapacitate, injure or kill people, in a context of war or terrorist attack. It has previously been shown that hair could trap the sulphur mustard simulants methyl salicylate and 2-chloroethyl ethyl sulphide. In order to investigate simulants persistency in hair after intense vapour exposure, their desorption kinetics were studied by using two complementary methods: hair residual content measurement and desorbed vapour monitoring. Results showed that both simulants were detected in air and could be recovered from hair 2 h after the end of exposure. Longer experiments with methyl salicylate showed that it could still be recovered from hair after 24 h. Our data were fitted with several kinetic models and best correlation was obtained with a bimodal first-order equation, suggesting a 2-step desorption kinetics model: initial fast regime followed by a slower desorption. 2-chloroethyl ethyl sulphide was also detected in the immediate environment after hair exposure for 2 h, and hair simulant content decreased by more than 80%. Our results showed that hair ability to release formerly trapped chemical toxics could lead to health hazard. Their persistency however confirmed the potentiality of hair analysis as a tool for chemical exposure assessment.
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Affiliation(s)
| | | | - Anne Piram
- Aix Marseille Univ, CNRS, LCE, Marseille, France.
| | - Alexandre Lacoste
- Bataillon des Marins Pompiers de Marseille (BMPM), 13303, Marseille, France
| | - Denis Josse
- Service Départemental d'Incendie et de Secours des Alpes-Maritimes (SDIS06), 06271, Villeneuve-Loubet, France
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6
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Rose D, Schmidt A, Brandenburger M, Sturmheit T, Zille M, Boltze J. Sulfur mustard skin lesions: A systematic review on pathomechanisms, treatment options and future research directions. Toxicol Lett 2017; 293:82-90. [PMID: 29203275 DOI: 10.1016/j.toxlet.2017.11.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 11/27/2017] [Accepted: 11/28/2017] [Indexed: 12/13/2022]
Abstract
Sulfur mustard (SM) is a chemical warfare, which has been used for one hundred years. However, its exact pathomechanisms are still incompletely understood and there is no specific therapy available so far. In this systematic review, studies published between January 2000 and July 2017 involving pathomechanisms and experimental treatments of SM-induced skin lesions were analyzed to summarize current knowledge on SM pathology, to provide an overview on novel treatment options, and to identify promising targets for future research to more effectively counter SM effects. We suggest that future studies should focus on (I) systemic effects of SM intoxication due to its distribution throughout the body, (II) removal of SM depots that continuously release active compound contributing to chronic skin damage, and (III) therapeutic options that counteract the pleiotropic effects of SM.
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Affiliation(s)
- Dorothee Rose
- Department of Translational Medicine and Cell Technology, Fraunhofer Research Institution for Marine Biotechnology and Cell Technology, Mönkhofer Weg 239a, 23562, Lübeck, Germany; Institute of Medical and Marine Biotechnology, University of Lübeck, Ratzeburger Allee 160, 23652, Lübeck, Germany
| | - Annette Schmidt
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany; Universität der Bundeswehr, Fakultät für Humanwissenschaften, Department für Sportwissenschaft, Werner-Heisenberg-Weg 39, 85577, Neubiberg, Germany.
| | - Matthias Brandenburger
- Department of Translational Medicine and Cell Technology, Fraunhofer Research Institution for Marine Biotechnology and Cell Technology, Mönkhofer Weg 239a, 23562, Lübeck, Germany; Institute of Medical and Marine Biotechnology, University of Lübeck, Ratzeburger Allee 160, 23652, Lübeck, Germany
| | - Tabea Sturmheit
- Department of Translational Medicine and Cell Technology, Fraunhofer Research Institution for Marine Biotechnology and Cell Technology, Mönkhofer Weg 239a, 23562, Lübeck, Germany; Institute of Medical and Marine Biotechnology, University of Lübeck, Ratzeburger Allee 160, 23652, Lübeck, Germany
| | - Marietta Zille
- Department of Translational Medicine and Cell Technology, Fraunhofer Research Institution for Marine Biotechnology and Cell Technology, Mönkhofer Weg 239a, 23562, Lübeck, Germany; Institute of Medical and Marine Biotechnology, University of Lübeck, Ratzeburger Allee 160, 23652, Lübeck, Germany; Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Ratzeburger Allee 160, 23562, Lübeck, Germany
| | - Johannes Boltze
- Department of Translational Medicine and Cell Technology, Fraunhofer Research Institution for Marine Biotechnology and Cell Technology, Mönkhofer Weg 239a, 23562, Lübeck, Germany; Institute of Medical and Marine Biotechnology, University of Lübeck, Ratzeburger Allee 160, 23652, Lübeck, Germany
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7
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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
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8
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Hall CA, Lydon HL, Dalton CH, Chipman JK, Graham JS, Chilcott RP. The percutaneous toxicokinetics of Sulphur mustard in a damaged skin porcine model and the evaluation of WoundStat™ as a topical decontaminant. J Appl Toxicol 2017; 37:1036-1045. [DOI: 10.1002/jat.3453] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/12/2017] [Accepted: 01/17/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Charlotte A. Hall
- CBRN & Chemical Toxicological Research Group, Centre for Radiation; Chemical and Environmental Hazards, Health Protection Agency; Chilton UK
- School of BioSciences; University of Birmingham; Birmingham UK
| | - Helen L. Lydon
- CBRN & Chemical Toxicological Research Group, Centre for Radiation; Chemical and Environmental Hazards, Health Protection Agency; Chilton UK
- School of BioSciences; University of Birmingham; Birmingham UK
| | | | | | - John S. Graham
- Medical Toxicology Branch Analytical Toxicology Division; US Army Medical Research Institute of Chemical Defense; Aberdeen Proving Ground; MD 21010 USA
| | - Robert P. Chilcott
- CBRN & Chemical Toxicological Research Group, Centre for Radiation; Chemical and Environmental Hazards, Health Protection Agency; Chilton UK
- Research Centre for Topical Drug Delivery and Toxicology; University of Hertfordshire; Hatfield UK
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9
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Lydon HL, Hall CA, Dalton CH, Chipman JK, Graham JS, Chilcott RP. Development of haemostatic decontaminants for treatment of wounds contaminated with chemical warfare agents. 3: Evaluation of in vitro
topical decontamination efficacy using damaged skin. J Appl Toxicol 2017; 37:976-984. [DOI: 10.1002/jat.3446] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 12/06/2016] [Accepted: 12/28/2016] [Indexed: 12/31/2022]
Affiliation(s)
- Helen L. Lydon
- Centre for Radiation, Chemical and Environmental Hazards; Health Protection Agency; Chilton UK
- University of Birmingham; Edgbaston Birmingham UK
| | - Charlotte A. Hall
- Centre for Radiation, Chemical and Environmental Hazards; Health Protection Agency; Chilton UK
- University of Birmingham; Edgbaston Birmingham UK
| | | | | | - John S. Graham
- Medical Toxicology Branch Analytical Toxicology Division; US Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground; MD 21010 USA
| | - Robert P. Chilcott
- Centre for Radiation, Chemical and Environmental Hazards; Health Protection Agency; Chilton UK
- Research Centre for Topical Drug Delivery and Toxicology; University of Hertfordshire; Hatfield UK
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10
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Balali-Mood M, Mousavi SH, Balali-Mood B. Chronic health effects of sulphur mustard exposure with special reference to Iranian veterans. EMERGING HEALTH THREATS JOURNAL 2017. [DOI: 10.3402/ehtj.v1i0.7068] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- M Balali-Mood
- Medical Toxicology Research Centre and Department of Medicine, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - SH Mousavi
- Medical Toxicology Research Centre and Department of Medicine, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - B Balali-Mood
- Department of Chemistry, Imperial College London, London, UK
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11
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Spiandore M, Piram A, Lacoste A, Prevost P, Maloni P, Torre F, Asia L, Josse D, Doumenq P. Efficacy of scalp hair decontamination following exposure to vapours of sulphur mustard simulants 2-chloroethyl ethyl sulphide and methyl salicylate. Chem Biol Interact 2016; 267:74-79. [PMID: 27492218 DOI: 10.1016/j.cbi.2016.07.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 07/11/2016] [Accepted: 07/13/2016] [Indexed: 11/18/2022]
Abstract
Chemical warfare agents are an actual threat and victims' decontamination is a main concern when mass exposure occurs. Skin decontamination with current protocols has been widely documented, as well as surface decontamination. However, considering hair ability to trap chemicals in vapour phase, we investigated hair decontamination after exposure to sulphur mustard simulants methyl salicylate and 2-chloroethyl ethyl sulphide. Four decontamination protocols were tested on hair, combining showering and emergency decontamination (use of Fuller's earth or Reactive Skin Decontamination Lotion RSDL®). Both simulants were recovered from hair after treatment, but contents were significantly reduced (42-85% content allowance). Showering alone was the least efficient protocol. Concerning 2-chloroethyl ethyl sulphide, protocols did not display significant differences in decontamination efficacy. For MeS, use of emergency decontaminants significantly increased showering efficacy (10-20% rise), underlining their usefulness before thorough decontamination. Our results highlighted the need to extensively decontaminate hair after chemical exposure. Residual amounts after decontamination are challenging, as their release from hair could lead to health issues.
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Affiliation(s)
| | - Anne Piram
- Aix-Marseille Univ, CNRS, LCE, Marseille, France.
| | - Alexandre Lacoste
- Bataillon des Marins-Pompiers (BMPM) de Marseille, 13303 Marseille, France
| | | | | | - Franck Torre
- Institut Méditerranéen de Biodiversité et d'Ecologie Marine et continentale (IMBE), Aix-Marseille Université, CNRS, IRD, Avignon Université, Faculté de Saint Jérôme, Case 421, 13397 Marseille Cedex 20, France
| | | | - Denis Josse
- Service Départemental d'Incendie et de Secours des Alpes-Maritimes (SDIS06), 06271 Villeneuve-Loubet Cedex, France
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12
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Chilcott RP, Dalton CH, Hill I, Davison CM, Blohm KL, Clarkson ED, Hamilton MG. In vivo skin absorption and distribution of the nerve agent VX (O–ethyl–S–[2(diisopropylamino)ethyl] methylphosphonothioate) in the domestic white pig. Hum Exp Toxicol 2016; 24:347-52. [PMID: 16119248 DOI: 10.1191/0960327105ht537oa] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The purpose of this study was to characterize the skin absorption and distribution of VX (Oethyl–S–[2(diisopropylamino)ethyl] methylphosphonothioate) in the domestic pig in order to evaluate the animal as a potential model for assessing pretreatments against toxic anti–cholinesterase compounds. A liquid droplet (equivalent to a 2 LD50 dose) of radiolabelled VX was applied to the inner ear–skin of each anaesthetized animal. Blood and tissue samples (liver, lung, kidney, heart and skin exposure sites) were obtained post–mortem. The amount of radioactivity in each sample was measured by liquid scintillation counting, from which the skin absorption rate and dose distribution of VX were calculated. A substantial proportion (229±3%) of the applied dose remained within the skin at the site of application. It is conceivable that strategies to minimize or remove this reservoir may be of benefit in the early treatment of VX–exposed casualties. Image analysis of autoradiographs of exposed skin sites indicated that each milligram of radioactive VX covered an area of 1.29±0.5 cm2. The average skin absorption rate of 14C-VX was 6619±126 mg/cm2 per hour. Comparison of these data with previous studies suggests that human skin is less permeable to VX than pig skin, but VX spreads over a greater surface area when applied to human skin. Thus, paradoxically, while pig-ear skin is more permeable than human skin, the difference in skin surface spreading may lead to the absorption of an equivalent systemic dose.
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Affiliation(s)
- R P Chilcott
- Chemical Hazards and Poisons Division, Health Protection Agency, Chilton, Didcot, Oxfordshire, UK.
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13
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Impact of topical application of sulfur mustard on mice skin and distant organs DNA repair enzyme signature. Toxicol Lett 2016; 241:71-81. [DOI: 10.1016/j.toxlet.2015.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 11/02/2015] [Accepted: 11/02/2015] [Indexed: 11/23/2022]
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14
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Effect of exposure area on nerve agent absorption through skin in vitro. Toxicol In Vitro 2015; 30:454-61. [DOI: 10.1016/j.tiv.2015.09.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 09/14/2015] [Accepted: 09/17/2015] [Indexed: 11/22/2022]
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15
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Batal M, Rebelo-Moreira S, Hamon N, Bayle PA, Mouret S, Cléry-Barraud C, Boudry I, Douki T. A guanine-ethylthioethyl-glutathione adduct as a major DNA lesion in the skin and in organs of mice exposed to sulfur mustard. Toxicol Lett 2015; 233:1-7. [PMID: 25562541 DOI: 10.1016/j.toxlet.2015.01.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 12/30/2014] [Accepted: 01/02/2015] [Indexed: 01/10/2023]
Abstract
Sulfur mustard (SM) is an old chemical warfare but it remains a threat to both militaries and civilians. SM mainly targets skin, eyes and lungs and diffuses to internal organs. At the molecular level, SM is able to damage DNA through the formation of monoadducts and biadduct. Glutathione (GSH) is another critical target of SM in cells since it is part of the detoxification mechanism against alkylating agents. In the present work, we investigated whether SM could form covalent bonds simultaneously with a DNA base and the sulfhydryl group of GSH. The expected guanine adduct, S-[2-(N7-guanyl)-ethylthioethyl]-glutathione (N7Gua-ETE-GSH), was synthesized and detected in several tissues of SKH-1 mice exposed to 60mg/kg of SM in the dorsal-lumbar region. N7Gua-ETE-GSH was detected in all organs studied, except in the liver. The tissue exhibiting the highest levels of N7Gua-ETE-GSH was skin, followed by brain, lungs, kidneys and spleen. N7Gua-ETE-GSH was detected in skin, brain and lungs as long as two weeks after exposure. The persistence was less in other organs. The observation of the formation of N7Gua-ETE-GSH in vivo confirms the variety of damages induced by SM in DNA. It also provides another example of the formation of DNA adducts involving glutathione following in vivo exposure to bifunctional alkylating compounds.
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Affiliation(s)
- Mohamed Batal
- Univ. Grenoble Alpes, INAC, LCIB, LAN, F-38000 Grenoble, France; CEA, INAC, SCIB, LAN, F-38000 Grenoble, France; Département de Toxicologie et Risques Chimiques, Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Silvestre Rebelo-Moreira
- Univ. Grenoble Alpes, INAC, LCIB, LAN, F-38000 Grenoble, France; CEA, INAC, SCIB, LAN, F-38000 Grenoble, France
| | - Nadège Hamon
- Univ. Grenoble Alpes, INAC, LCIB, LAN, F-38000 Grenoble, France; CEA, INAC, SCIB, LAN, F-38000 Grenoble, France
| | - Pierre-Alain Bayle
- Univ. Grenoble Alpes, INAC, LCIB, LAN, F-38000 Grenoble, France; CEA, INAC, SCIB, LRM, F-38000 Grenoble, France
| | - Stéphane Mouret
- Département de Toxicologie et Risques Chimiques, Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Cécile Cléry-Barraud
- Département de Toxicologie et Risques Chimiques, Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Isabelle Boudry
- Département de Toxicologie et Risques Chimiques, Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Thierry Douki
- Univ. Grenoble Alpes, INAC, LCIB, LAN, F-38000 Grenoble, France; CEA, INAC, SCIB, LAN, F-38000 Grenoble, France.
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16
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Goswami DG, Kumar D, Tewari-Singh N, Orlicky DJ, Jain AK, Kant R, Rancourt RC, Dhar D, Inturi S, Agarwal C, White CW, Agarwal R. Topical nitrogen mustard exposure causes systemic toxic effects in mice. ACTA ACUST UNITED AC 2014; 67:161-70. [PMID: 25481215 DOI: 10.1016/j.etp.2014.11.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 11/12/2014] [Accepted: 11/17/2014] [Indexed: 10/24/2022]
Abstract
Vesicating agents sulfur mustard (SM) and nitrogen mustard (NM) are reported to be easily absorbed by skin upon exposure causing severe cutaneous injury and blistering. Our studies show that topical exposure of NM (3.2mg) onto SKH-1 hairless mouse skin, not only caused skin injury, but also led to significant body weight loss and 40-80% mortality (120 h post-exposure), suggesting its systemic effects. Accordingly, further studies herein show that NM exposure initiated an increase in circulating white blood cells by 24h (neutrophils, eosinophils and basophils) and thereafter a decrease (neutrophils, lymphocytes and monocytes). NM exposure also reduced both white and red pulp areas of the spleen. In the small intestine, NM exposure caused loss of membrane integrity of the surface epithelium, abnormal structure of glands and degeneration of villi. NM exposure also resulted in the dilation of glomerular capillaries of kidneys, and an increase in blood urea nitrogen/creatinine ratio. Our results here with NM are consistent with earlier reports that exposure to higher SM levels can cause damage to the hematopoietic system, and kidney, spleen and gastrointestinal tract toxicity. These outcomes will add to our understanding of the toxic effects of topical vesicant exposure, which might be helpful towards developing effective countermeasures against injuries from acute topical exposures.
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Affiliation(s)
- Dinesh G Goswami
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Dileep Kumar
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Neera Tewari-Singh
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - David J Orlicky
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Anil K Jain
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Rama Kant
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Raymond C Rancourt
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Deepanshi Dhar
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Swetha Inturi
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Chapla Agarwal
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Carl W White
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Rajesh Agarwal
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
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Dalton CH, Hall CA, Lydon HL, Chipman JK, Graham JS, Jenner J, Chilcott RP. Development of haemostatic decontaminants for the treatment of wounds contaminated with chemical warfare agents. 2: Evaluation ofin vitrotopical decontamination efficacy using undamaged skin. J Appl Toxicol 2014; 35:543-50. [DOI: 10.1002/jat.3060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 07/09/2014] [Accepted: 07/10/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Christopher H. Dalton
- Biomedical Sciences; Dstl Porton Down; Salisbury SP4 0JQ UK
- School of Biosciences; University of Birmingham; Birmingham B15 2TT UK
| | - Charlotte A. Hall
- School of Biosciences; University of Birmingham; Birmingham B15 2TT UK
- Centre for Radiation, Chemical and Environmental Hazards; Health Protection Agency; Chilton Oxfordshire OX11 0JQ UK
| | - Helen L. Lydon
- School of Biosciences; University of Birmingham; Birmingham B15 2TT UK
- Centre for Radiation, Chemical and Environmental Hazards; Health Protection Agency; Chilton Oxfordshire OX11 0JQ UK
| | - J. K. Chipman
- School of Biosciences; University of Birmingham; Birmingham B15 2TT UK
| | - John S. Graham
- Medical Toxicology Branch, USAMRICD; Aberdeen Proving Ground; MD 21010-5400 USA
| | - John Jenner
- Biomedical Sciences; Dstl Porton Down; Salisbury SP4 0JQ UK
| | - Robert P. Chilcott
- Centre for Radiation, Chemical and Environmental Hazards; Health Protection Agency; Chilton Oxfordshire OX11 0JQ UK
- Research Centre for Transdermal Drug Delivery and Toxicology, Department of Pharmacy; University of Hertfordshire; Hatfield Herts AL10 9AB UK
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Batal M, Boudry I, Mouret S, Cléry-Barraud C, Wartelle J, Bérard I, Douki T. DNA damage in internal organs after cutaneous exposure to sulphur mustard. Toxicol Appl Pharmacol 2014; 278:39-44. [PMID: 24732442 DOI: 10.1016/j.taap.2014.04.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 03/27/2014] [Accepted: 04/03/2014] [Indexed: 11/30/2022]
Abstract
Sulphur mustard (SM) is a chemical warfare agent that attacks mainly skin, eye and lungs. Due to its lipophilic properties, SM is also able to diffuse through the skin and reach internal organs. DNA represents one of the most critical molecular targets of this powerful alkylating agent which modifies DNA structure by forming monoadducts and biadducts. These DNA lesions are involved in the acute toxicity of SM as well as its long-term carcinogenicity. In the present work we studied the formation and persistence of guanine and adenine monoadducts and guanine biadducts in the DNA of brain, lungs, kidneys, spleen, and liver of SKH-1 mice cutaneously exposed to 2, 6 and 60mg/kg of SM. SM-DNA adducts were detected in all studied organs, except in liver at the two lowest doses. Brain and lungs were the organs with the highest level of SM-DNA adducts, followed by kidney, spleen and liver. Monitoring the level of adducts for three weeks after cutaneous exposure showed that the lifetime of adducts were not the same in all organs, lungs being the organ with the longest persistence. Diffusion from skin to internal organs was much more efficient at the highest compared to the lowest dose investigated as the result of the loss of the skin barrier function. These data provide novel information on the distribution of SM in tissues following cutaneous exposures and indicate that brain is an important target.
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Affiliation(s)
- Mohamed Batal
- Laboratoire « Lésions des Acides Nucléiques », Université Joseph Fourier - Grenoble 1/CEA/Institut Nanoscience et Cryogénie/SCIB, UMR-E3, Grenoble, France; Département de Toxicologie et Risques Chimiques; Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Isabelle Boudry
- Département de Toxicologie et Risques Chimiques; Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Stéphane Mouret
- Département de Toxicologie et Risques Chimiques; Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Cécile Cléry-Barraud
- Département de Toxicologie et Risques Chimiques; Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Julien Wartelle
- Département de Toxicologie et Risques Chimiques; Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, BP87, F-38702 La Tronche Cedex, France
| | - Izabel Bérard
- Laboratoire « Lésions des Acides Nucléiques », Université Joseph Fourier - Grenoble 1/CEA/Institut Nanoscience et Cryogénie/SCIB, UMR-E3, Grenoble, France
| | - Thierry Douki
- Laboratoire « Lésions des Acides Nucléiques », Université Joseph Fourier - Grenoble 1/CEA/Institut Nanoscience et Cryogénie/SCIB, UMR-E3, Grenoble, France.
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19
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Modified immunoslotblot assay to detect hemi and sulfur mustard DNA adducts. Chem Biol Interact 2013; 206:523-8. [DOI: 10.1016/j.cbi.2013.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 07/29/2013] [Accepted: 08/01/2013] [Indexed: 11/23/2022]
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20
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Batal M, Boudry I, Mouret S, Wartelle J, Emorine S, Bertoni M, Bérard I, Cléry-Barraud C, Douki T. Temporal and spatial features of the formation of DNA adducts in sulfur mustard-exposed skin. Toxicol Appl Pharmacol 2013; 273:644-50. [PMID: 24141030 DOI: 10.1016/j.taap.2013.10.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Revised: 10/05/2013] [Accepted: 10/08/2013] [Indexed: 11/28/2022]
Abstract
Sulfur mustard (SM) is a chemical warfare agent that targets skin where it induces large blisters. DNA alkylation is a critical step to explain SM-induced cutaneous symptoms. We determined the kinetics of formation of main SM-DNA adducts and compare it with the development of the SM-induced pathogenesis in skin. SKH-1 mice were exposed to 2, 6 and 60 mg/kg of SM and treated skin was biopsied between 6h and 21 days. Formation of SM DNA adducts was dose-dependent with a maximum immediately after exposure. However, adducts were persistent and still detectable 21 days post-exposure. The time-dependent formation of DNA adducts was also found to be correlated with the appearance of apoptotic cells. This temporal correlation suggests that these two early events are responsible for the severity of the damage to the skin. Besides, SM-DNA adducts were also detected in areas located next to contaminated zone, thus suggesting that SM diffuses in skin. Altogether, this work provides for the first time a clear picture of SM-induced genotoxicity using DNA adducts as a marker.
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Affiliation(s)
- Mohamed Batal
- Laboratoire «Lésions des Acides Nucléiques», Université Joseph Fourier - Grenoble 1, CEA/Institut Nanoscience et Cryogénie/SCIB, UMR-E3, Grenoble, France; Département de Toxicologie et Risques Chimiques, Unité de Brûlure Chimique, Institut de Recherche Biomédicale des Armées, Antenne de La Tronche, France
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21
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Inturi S, Tewari-Singh N, Jain AK, Roy S, White CW, Agarwal R. Absence of a p53 allele delays nitrogen mustard-induced early apoptosis and inflammation of murine skin. Toxicology 2013; 311:184-90. [PMID: 23845566 DOI: 10.1016/j.tox.2013.06.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 06/14/2013] [Accepted: 06/28/2013] [Indexed: 11/18/2022]
Abstract
Bifunctional alkylating agent sulfur mustard (SM) and its analog nitrogen mustard (NM) cause DNA damage leading to cell death, and potentially activating inflammation. Transcription factor p53 plays a critical role in DNA damage by regulating cell cycle progression and apoptosis. Earlier studies by our laboratory demonstrated phosphorylation of p53 at Ser15 and an increase in total p53 in epidermal cells both in vitro and in vivo following NM exposure. To elucidate the role of p53 in NM-induced skin toxicity, we employed SKH-1 hairless mice harboring wild type (WT) or heterozygous p53 (p53+/-). Exposure to NM (3.2mg) caused a more profound increase in epidermal thickness and apoptotic cell death in WT relative to p53+/- mice at 24h. However, by 72h after exposure, there was a comparable increase in NM-induced epidermal cell death in both WT and p53+/- mice. Myeloperoxidase activity data showed that neutrophil infiltration was strongly enhanced in NM-exposed WT mice at 24h persisting through 72h of exposure. Conversely, robust NM-induced neutrophil infiltration (comparable to WT mice) was seen only at 72h after exposure in p53+/- mice. Similarly, NM-exposure strongly induced macrophage and mast cell infiltration in WT, but not p53+/- mice. Together, these data indicate that early apoptosis and inflammation induced by NM in mouse skin are p53-dependent. Thus, targeting this pathway could be a novel strategy for developing countermeasures against vesicants-induced skin injury.
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Affiliation(s)
- Swetha Inturi
- Department of Pharmaceutical Sciences, University of Colorado Skaggs School of Pharmacy and Pharmaceutical Sciences, 12850 E. Montview Blvd, Aurora, CO 80045, USA.
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22
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Misik J, Jost P, Pavlikova R, Vodakova E, Cabal J, Kuca K. A comparison of decontamination effects of commercially available detergents in rats pre-exposed to topical sulphur mustard. Cutan Ocul Toxicol 2012; 32:135-9. [DOI: 10.3109/15569527.2012.730087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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23
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Misik J, Pavlik M, Novotny L, Pavlikova R, Chilcott RP, Cabal J, Kuca K. In vivodecontamination of the nerve agent VX using the domestic swine model. Clin Toxicol (Phila) 2012; 50:807-11. [DOI: 10.3109/15563650.2012.720986] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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24
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Cléry-Barraud C, Nguon N, Vallet V, Sentenac C, Four E, Arlaud C, Coulon D, Boudry I. Sulfur mustard cutaneous injury characterization based on SKH-1 mouse model: relevance of non-invasive methods in terms of wound healing process analyses. Skin Res Technol 2012; 19:e146-56. [DOI: 10.1111/j.1600-0846.2012.00621.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2012] [Indexed: 11/29/2022]
Affiliation(s)
- Cécile Cléry-Barraud
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
| | - Nina Nguon
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
| | - Virginie Vallet
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
| | - Catherine Sentenac
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
| | - Elise Four
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
| | - Carine Arlaud
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
| | - David Coulon
- Animal Husbandy Service; Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; La Tronche Cedex; France
| | - Isabelle Boudry
- Chemical Burn Unit, Toxicology and Chemical Risk Department; Armed Forces Biomedical Research Institute IRBA; 38702 La Tronche Cedex; France
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25
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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]
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26
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Panahi Y, Sarayani A, Beiraghdar F, Amiri M, Davoudi SM, Sahebkar A. Management of sulfur mustard-induced chronic pruritus: a review of clinical trials. Cutan Ocul Toxicol 2011; 31:220-5. [DOI: 10.3109/15569527.2011.631655] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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27
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Mikler J, Tenn C, Worek F, Reiter G, Thiermann H, Garrett M, Bohnert S, Sawyer T. Immobilization of Russian VX skin depots by localized cooling: Implications for decontamination and medical countermeasures. Toxicol Lett 2011; 206:47-53. [DOI: 10.1016/j.toxlet.2011.05.1047] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Accepted: 05/30/2011] [Indexed: 10/18/2022]
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28
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The therapeutic use of localized cooling in the treatment of VX poisoning. Toxicol Lett 2011; 204:52-6. [DOI: 10.1016/j.toxlet.2011.04.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 04/06/2011] [Accepted: 04/11/2011] [Indexed: 11/23/2022]
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29
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Emadi SN, Kaffashi M, Poursaleh Z, Akhavan-Moghaddam J, Soroush MR, Emadi SE, Taghavi NOS. Sulfur mustard-induced poikiloderma: A case report. Cutan Ocul Toxicol 2010; 30:170-4. [DOI: 10.3109/15569527.2010.539585] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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30
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Ghabili K, Agutter PS, Ghanei M, Ansarin K, Shoja MM. Mustard gas toxicity: the acute and chronic pathological effects. J Appl Toxicol 2010; 30:627-43. [PMID: 20836142 DOI: 10.1002/jat.1581] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Revised: 07/15/2010] [Accepted: 07/19/2010] [Indexed: 11/11/2022]
Abstract
Ever since it was first used in armed conflict, mustard gas (sulfur mustard, MG) has been known to cause a wide range of acute and chronic injuries to exposure victims. The earliest descriptions of these injuries were published during and in the immediate aftermath of the First World War, and a further series of accounts followed the Second World War. More recently, MG has been deployed in warfare in the Middle East and this resulted in large numbers of victims, whose conditions have been studied in detail at hospitals in the region. In this review, we bring together the older and more recent clinical studies on MG toxicity and summarize what is now known about the acute and chronic effects of the agent on the eyes, skin, respiratory tract and other physiological systems. In the majority of patients, the most clinically serious long-term consequences of MG poisoning are on the respiratory system, but the effects on the skin and other systems also have a significant impact on quality of life. Aspects of the management of these patients are discussed.
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Affiliation(s)
- Kamyar Ghabili
- Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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31
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Pita R, Vidal-Asensi S. [Cutaneous and systemic toxicology of vesicants used in warfare]. ACTAS DERMO-SIFILIOGRAFICAS 2010; 101:7-18. [PMID: 20109388 DOI: 10.1016/j.ad.2009.07.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Vesicants are a group of chemicals used in warfare. The most representative agent is yperite, also known as mustard gas. The blisters that appeared on those exposed to yperite during combat in the First World War are responsible for the current name--vesicants--for this group of chemicals. Their affects are produced mainly through localized action of liquid or vapor forms on the skin, eyes, and respiratory tract. However, the high absorption of the liquid form through the skin or the vapor form on inhalation may cause substantial systemic effects. Here we analyze these effects, treatment of intoxication, and long-term sequelae, drawing on our experience and a review of the literature.
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Affiliation(s)
- R Pita
- Departamento de Defensa Química, Escuela Militar de Defensa NBQ, Madrid, España.
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Sharma A, Saxena A, Singh B. In-situ degradation of sulphur mustard using (1R)-(-)-(camphorylsulphonyl) oxaziridine impregnated adsorbents. JOURNAL OF HAZARDOUS MATERIALS 2009; 172:650-653. [PMID: 19674836 DOI: 10.1016/j.jhazmat.2009.07.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 07/14/2009] [Accepted: 07/14/2009] [Indexed: 05/28/2023]
Abstract
Bis-2-chloroethyl sulphide (sulphur mustard or HD) is an extremely toxic and persistent chemical warfare agent. For in-situ degradation of HD and its analogues (simulants), i.e., dibutyl sulphide (DBS) and ethyl 2-hydroxyethyl sulphide (HEES), different adsorbents systems loaded with (1R)-(-)-(camphorylsulphonyl) oxaziridine were prepared. Solution of sulphur mustard and its simulants was prepared in carbon tetrachloride and taken for uniform adsorption on the impregnated systems using incipient volume. Degradation kinetics monitored by GC/FID were found to be first-order. The half-life of degradation reactions for simulants was obtained in less than 30 and for HD in 120 min. From the studied kinetics it was observed that reaction was very rapid with simulants and decreased rate was found for HD. The order of reactivity of MgO/Oxa system for HD and simulants was found to be DBS>HEES>HD. Reaction products of the oxidation reaction of simulants and HD on adsorbents were extracted in dichloromethane and analysed by GC-MS. The products were found to be non-toxic sulphoxide. The objective of the study is to develop a reactive adsorbent for in-situ degradation of sulphur mustard which could be used in nuclear biological and chemical (NBC) filtration systems.
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Affiliation(s)
- Abha Sharma
- Industrial Toxicology Research Centre, Mahatam Gandhi Marg, Lucknow, UP, India.
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Kehe K, Thiermann H, Balszuweit F, Eyer F, Steinritz D, Zilker T. Acute effects of sulfur mustard injury—Munich experiences. Toxicology 2009; 263:3-8. [DOI: 10.1016/j.tox.2009.04.060] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2009] [Revised: 04/20/2009] [Accepted: 04/21/2009] [Indexed: 10/20/2022]
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35
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Emadi SN, Hosseini-Khalili A, Soroush M, Ardakani MK, Ghassemi-Broumand M, Davoodi SM, Amirani O, Haines D. External urethral stenosis: a latent effect of sulfur mustard two decades post-exposure. Int J Dermatol 2009; 48:960-3. [DOI: 10.1111/j.1365-4632.2009.04128.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Emadi SN, Moeineddin F, Sorush MR. Urinary and cutaneous complications of sulphur mustard poisoning preceding pulmonary and ocular involvement: an unusual sequence of symptoms. Clin Exp Dermatol 2009; 34:e7-10. [DOI: 10.1111/j.1365-2230.2008.02965.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Balali-Mood M, Mousavi S, Balali-Mood B. Chronic health effects of sulphur mustard exposure with special reference to Iranian veterans. EMERGING HEALTH THREATS JOURNAL 2008; 1:e7. [PMID: 22460216 PMCID: PMC3167581 DOI: 10.3134/ehtj.08.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2007] [Revised: 02/20/2008] [Accepted: 03/03/2008] [Indexed: 11/18/2022]
Abstract
The widespread use of sulphur mustard (SM) as an incapacitating chemical warfare agent in the past century has proved its long-lasting toxic effects. It may also be used as a chemical terrorist agent. Therefore, all health professionals should have sufficient knowledge and be prepared for any such chemical attack. SM exerts direct toxic effects on the eyes, skin, and respiratory tissue, with subsequent systemic action on the nervous, immunological, haematological, digestive, and reproductive systems. SM is an alkylating agent that affects DNA synthesis, and, thus, delayed complications have been seen since the First World War. Cases of malignancies in the target organs, particularly in haematopoietic, respiratory, and digestive systems, have been reported. Important delayed respiratory complications include chronic bronchitis, bronchiectasis, frequent bronchopneumonia, and pulmonary fibrosis, all of which tend to deteriorate with time. Severe dry skin, delayed keratitis, and reduction of natural killer cells with subsequent increased risk of infections and malignancies are also among the most distressing long-term consequences of SM intoxication. However, despite a lot of research over the past decades on Iranian veterans, there are still major gaps in the SM literature. Immunological and neurological dysfunction, as well as the relationship between SM exposure and mutagenicity, carcinogenicity, and teratogenicity are important fields that require further studies, particularly on Iranian veterans with chronic health effects of SM poisoning. There is also a paucity of information on the medical management of acute and delayed toxic effects of SM poisoning—a subject that greatly challenges health care specialists.
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Affiliation(s)
- M Balali-Mood
- Medical Toxicology Research Centre and Department of Medicine, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
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38
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Rogers JV, Kohne JW, Hayes TL, Reid FM, Graham JS. Measuring Liquid Sulfur Mustard Recovery to Characterize a Weanling Swine Skin Short-Term Exposure Model. Cutan Ocul Toxicol 2008. [DOI: 10.1081/cus-200068610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Shohrati M, Peyman M, Peyman A, Davoudi M, Ghanei M. Cutaneous and Ocular Late Complications of Sulfur Mustard in Iranian Veterans. Cutan Ocul Toxicol 2008; 26:73-81. [PMID: 17612976 DOI: 10.1080/15569520701212399] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Although sulfur mustard (SM) has been used as a chemical warfare agent since the early twentieth century, it has reemerged in the past decade as a major threat around the world. This agent injured over 100,000 Iranians and one-third is suffering from late effects until today. Mustard affects many organs such as the skin, eyes, and lungs, as well as the gastrointestinal, endocrine, and hematopoietic system. In this study we focused on review of the late Cutaneous and ocular complications caused by exposure to SM. All studies regarding long-term ocular and cutaneous effects, which have been done on Iranian population, were collected from domestic and international sources. Pruritus is the most common complain and a malignant change is the most important lesion, which has to be considered. Also this agent is causes of chronic and delayed destructive lesions in the ocular surface and cornea, leading to progressive visual deterioration and ocular irritation.
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Affiliation(s)
- Majid Shohrati
- Research Center of Chemical Injuries, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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Chilcott RP, Dalton CH, Ashley Z, Allen CE, Bradley ST, Maidment MP, Jenner J, Brown RFR, Gwyther RJ, Rice P. Evaluation of Barrier Creams Against Sulphur Mustard: (II)In VivoandIn VitroStudies using the Domestic White Pig. Cutan Ocul Toxicol 2008; 26:235-47. [PMID: 17687688 DOI: 10.1080/15569520701212373] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Previous studies in our laboratory have demonstrated that barrier creams, comprising perfluorinated polymers, are effective against the chemical warfare agent sulphur mustard (SM) when evaluated using human skin in vitro. The purpose of this follow-up study was to further evaluate three candidate (perfluorinated) barrier creams against SM (vapour) using the domestic white pig. The severity and progression of the resulting skin lesions were quantified daily for three weeks post-exposure using biophysical measurements of transepidermal water loss (TEWL) and skin reflectance spectroscopy (SRS). Skin biopsies obtained post-mortem were evaluated by light microscopy and additional skin samples were obtained from adjacent (unexposed) skin sites for a comparative in vitro skin absorption study. Samples of SM vapour within the dosing chambers were measured ex vivo to ascertain the exposure dose (Ct). The three creams were highly effective against SM in vivo (Ct approximately 5000 mg.min.m(-3)): After 3 weeks, barrier cream pre-treated sites were not significantly different from control (unexposed) skin when evaluated by TEWL, SRS or histology. In contrast, skin exposed to SM without pre-treatment showed evidence of persistent damage that was consistent with the slow healing time observed in humans. The amount of SM absorbed in vitro in untreated pig skin was similar to that required to cause comparable lesions in human skin (8-20 and 4-10 microg.cm(-2), respectively), further validating the use of pigs as a toxicologically-relevant dermal model for SM exposure.
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Affiliation(s)
- Robert P Chilcott
- Chemical Hazards and Poisons Division, Health Protection Agency, Chilton, Didcot, Oxfordshire, United Kingdom.
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41
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The skin reservoir of sulphur mustard. Toxicol In Vitro 2008; 22:1539-46. [DOI: 10.1016/j.tiv.2008.06.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2008] [Revised: 05/20/2008] [Accepted: 06/06/2008] [Indexed: 11/24/2022]
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Cross SE, Roberts MS. Use of In Vitro Human Skin Membranes to Model and Predict the Effect of Changing Blood Flow on the Flux and Retention of Topically Applied Solutes. J Pharm Sci 2008; 97:3442-50. [DOI: 10.1002/jps.21253] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ahn SM, Hwang JS, Lee SH. Fructose 1,6-Diphosphate Alleviates UV-Induced Oxidative Skin Damage in Hairless Mice. Biol Pharm Bull 2007; 30:692-7. [PMID: 17409504 DOI: 10.1248/bpb.30.692] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Reactive oxygen species (ROS) are involved in the deleterious effects of UV light on skin. The antioxidant defense system is considered to be crucial for protecting skin from ROS. Recently, we showed that fructose 1,6-diphosphate (FDP), a glycolytic metabolite, reduced oxidative stress in UVB-irradiated keratinocytes. This study set out to determine whether topically applied FDP could exert protective effects against UV-induced skin damage in hairless mice. An in vitro skin permeation study using Franz-type diffusion cells showed that the amount of [14C]-FDP that diffused through the skin increased in a time-dependent manner, and about 3.5% of the applied FDP penetrated the skin after 24 h. Topical application of FDP (1%) preserved the endogenous antioxidant capacity of skin such as catalase and glutathione, which were significantly reduced after UVB irradiation without FDP. FDP also reversed the loss of catalase protein and prevented the accumulation of carbonylated proteins induced by UVB irradiation. These results provide evidence that topically administered FDP could penetrate into the skin and attenuate UVB-induced oxidative skin damage in hairless mice.
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Affiliation(s)
- Soo-Mi Ahn
- Department of Physiology, Ajou University School of Medicine, Republic of Korea
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Menon GK, Brandsma JL, Schwartz PM. Particle-Mediated Gene Delivery and Human Skin: Ultrastructural Observations on Stratum Corneum Barrier Structures. Skin Pharmacol Physiol 2006; 20:141-7. [PMID: 17525512 DOI: 10.1159/000098165] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2006] [Accepted: 10/05/2006] [Indexed: 11/19/2022]
Abstract
The particle-mediated delivery systems are becoming a clinically relevant tool in dermatology and immunology. We investigated the qualitative ultrastructural morphology of skin following pressure-driven delivery of gold particles to ex vivo human breast skin, at different pressures ranging from 350 to 1,000 psi. Pressures of 800 and 1,000 psi appear to be more effective, as indicated by distribution of particles in the viable epidermis and dermis. Particle bombardment of the skin with gold beads caused microwounds that spanned the stratum corneum (SC). The SC lipids did not reseal these wounds in the SC after 24 h in organ culture. The implications of particle-mediated delivery to permeability barrier functions of the SC are discussed.
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Affiliation(s)
- G K Menon
- Global Research and Development, Avon Products Inc., Suffern, NY 10901, USA.
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45
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Dalton CH, Hattersley IJ, Rutter SJ, Chilcott RP. Absorption of the nerve agent VX (O-ethyl-S-[2(di-isopropylamino)ethyl] methyl phosphonothioate) through pig, human and guinea pig skin in vitro. Toxicol In Vitro 2006; 20:1532-6. [PMID: 16904285 DOI: 10.1016/j.tiv.2006.06.009] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2005] [Revised: 05/23/2006] [Accepted: 06/09/2006] [Indexed: 11/22/2022]
Abstract
The physico-chemical properties of VX make the skin the most likely route of absorption into the human body. The development of effective medical countermeasures against such percutaneous threat agents relies on the use of appropriate animal models, as the inherent toxicity of nerve agents precludes the use of human volunteers. Previous studies have characterised the mechanism of nerve agent toxicity in rodent models, however, it is generally accepted that one of the most appropriate animal models for human skin absorption is the domestic pig. The purpose of the present study was to measure and compare the skin absorption kinetics of VX in vitro using pig, human and guinea pig skin to highlight any potential species differences in skin permeability. When undiluted VX was applied directly to the skin, the permeability of guinea pig skin was approximately 7-fold greater than human skin. There was no significant difference in the permeability of pig and human skin. When VX diluted with isopropyl alcohol was applied to the skin, the permeability of guinea pig skin was approximately 4-fold greater than human skin. There was no significant difference in the permeability of pig and human skin. From this data it may be inferred that dermatomed, abdominal pig skin is an appropriate model for the human skin absorption of VX.
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46
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Nelson P, Hancock JR, Sawyer TW. Therapeutic effects of hypothermia on Lewisite toxicity. Toxicology 2006; 222:8-16. [PMID: 16488528 DOI: 10.1016/j.tox.2005.12.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2005] [Revised: 12/16/2005] [Accepted: 12/21/2005] [Indexed: 11/26/2022]
Abstract
The cytotoxicity of the arsenical vesicant Lewisite was assessed in first passage cultures of proliferating neonatal human skin keratinocytes. Both munitions grade and distilled Lewisite were extremely toxic with LC(50) values in the low ng/ml range, with no significant differences between them. This similarity in toxicity was also mirrored with respect to their toxic effects on hairless guinea pig skin. Two-, 4- and 6-min vapour exposures of these agents resulted in similar and severe skin injury that was obvious by 3-5h post-exposure and almost maximal at 24h. The toxicity of Lewisite in culture was temperature dependent, with a >10-fold reduction in 24h LC(50) values as the incubation temperature was reduced from 37 to 25 degrees C. However, this cooling induced protection was not persistent. In contrast, cooling of Lewisite exposed hairless guinea pig skin at approximately 10 degrees C for as little as 30 min post-exposure resulted in dramatic and permanent protection, with 4h of cooling almost completely eliminating Lewisite induced skin injury. Further, significant protection was also evident even when cooling was delayed for as long as 2h post-Lewisite exposure. In an effort to investigate whether cooling might also increase the window in which chelation therapy against this vesicant agent would be useful, we examined the protective effects of the heavy metal chelator dimercaptosuccinic acid (DMSA). Topical application to Lewisite exposed skin was extremely protective, even when delayed for 2h after Lewisite. Cooling of Lewisite exposed skin for 2h, followed by DMSA topical application resulted in decreased skin injury compared to either treatment in isolation. It appears that the simple and non-invasive application of cooling measures may provide not only significant therapeutic relief to Lewisite exposed skin, but that it may also increase the therapeutic window in which medical countermeasures against this vesicant agent are useful.
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Affiliation(s)
- Peggy Nelson
- Chemical Biological Defence Section, Defence Research and Development Canada-Suffield, Box 4000, Medicine Hat, Alta., Canada T1A 8K6
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Abstract
Sulphur mustard is one of the major chemical warfare agents developed and used during World War I. Large stockpiles are still present in several countries. It is relatively easy to produce and might be used as a terroristic weapon. Sulphur mustard is a vesicant agent and causes cutaneous blisters, respiratory tract damage, eye lesions and bone marrow depression. The clinical picture of poisoning is well known from the thousands of victims during World War I and the Iran-Iraq war. In the latter conflict, sulphur mustard was heavily used and until now about 30,000 victims still suffer from late effects of the agent like chronic obstructive lung disease, lung fibrosis, recurrent corneal ulcer disease, chronic conjunctivitis, abnormal pigmentation of the skin, and several forms of cancer. Despite enormous research efforts during the last 90 years, no specific sulphur mustard antidote has been found. The prospering knowledge and developments of modern medicine created nowadays new chances to minimize sulphur mustard-induced organ damage and late effects.
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Affiliation(s)
- Kai Kehe
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstr. 11, D-80937 Munich, Germany.
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48
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Chilcott RP. Toxicity of sulphur mustard. Toxicol Appl Pharmacol 2005; 204:99-100; author reply 100. [PMID: 15781298 DOI: 10.1016/j.taap.2004.09.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2004] [Indexed: 11/28/2022]
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Vavra AK, Laurent CJ, Ngo V, Sweeney JF, Levitt JM. Sulfur mustard primes phagocytosis and degranulation in human polymorphonuclear leukocytes. Int Immunopharmacol 2004; 4:437-45. [PMID: 15037221 DOI: 10.1016/j.intimp.2004.01.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2003] [Revised: 12/16/2003] [Accepted: 01/29/2004] [Indexed: 11/25/2022]
Abstract
Sulfur mustard (2,2'-bis-chloroethyl-sulfide; SM) is a chemical warfare vesicant that causes debilitating skin lesions. Although a great deal of work has focused on the direct effects of SM exposure on the epithelium, it is unclear how much the inflammatory response, induced by exposure, contributes to lesion pathogenesis. Keratinocytes exposed to SM express a number of inflammatory mediators and elicit a cellular infiltrate consisting largely of polymorphonuclear leukocytes (PMN). PMN infiltration into SM lesions occurs as early as 30 min and peaks after several hours postexposure, and, despite the relatively short half-life of SM, PMN infiltrating a lesion could be exposed to micromolar concentrations of the agent. Previously, we have shown that exposure to low doses of sulfur mustard prime oxidative function in human PMN. The current study was undertaken to evaluate the effects of low-dose SM exposure on PMN phagocytosis, degranualtion and chemotaxis. PMN exposed to low doses of SM (50-200 microM) showed a dose-dependent enhancement of phagocytic function. Exocytosis of PMN azurophilic and specific granules [determined by analysis of granule-specific intravesicular receptors, Interleukin 10 receptor (IL-10R) and CD63] was also enhanced by SM exposure. Finally, we examined the effect of SM as a chemoattractant for PMN and show that SM is not itself a chemotaxin. These results suggest that SM injury may, in part, be caused by normal inflammatory function, and that therapeutic strategies aimed at down-regulating PMN activation could lessen the severity of SM injury and the time required for its resolution.
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Affiliation(s)
- Ashley K Vavra
- Michael E. DeBakey Department of Surgery, Baylor College of Medicine, VAMC Building 110, Research Line 151, 2002 Holcombe Blvd., Houston, TX 77030, USA
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50
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Chilcott RP, Jenner J, Hotchkiss SAM, Rice P. Evaluation of barrier creams against sulphur mustard. I. In vitro studies using human skin. Skin Pharmacol Physiol 2002; 15:225-35. [PMID: 12218284 DOI: 10.1159/000065969] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The purpose of this study was to assess the effectiveness of a range of passive and reactive barrier cream formulations against the chemical warfare agent sulphur mustard (SM) using an in vitro diffusion cell system containing human skin. In general, proprietary formulations were relatively effective under occluded conditions, but ineffective under unoccluded conditions. For example, SM skin absorption rates through occluded control and Stokoderm pre-treated skin were 538 +/- 193 and 200 +/- 51 microg x cm(-2) x h(-1), respectively (p < 0.05). Under unoccluded conditions, control and Stokoderm pre-treated skin absorption rates were 4.41 +/- 1.90 and 36.84 +/- 15.19 microg x cm(-2) x h(-1) (p < 0.05). Novel (perfluorinated) barrier creams were generally more effective under unoccluded conditions; pre-treatment with one formulation led to an 18-fold reduction in skin absorption rate and reduced the total amount of SM penetrated by 95% of the applied dose. Several proprietary formulations also had adverse effects on the effectiveness of the skin decontaminant fuller's earth. The rate (Jss) and total amount (percentage of dose) of SM absorbed through the skin were deemed to be independent parameters of barrier cream performance. These data indicate that (1) perceived conditions of use, (2) compatibility with existing protective equipment and (3) the rate and extent of SM skin absorption must all be taken into account when evaluating barrier creams in vitro.
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