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Title: NMDA antagonists exert distinct effects in experimental organophosphate or carbamate poisoning in mice

Abstract

Organophosphate (OP) and carbamate acetylcholinesterase (AChE) inhibitors produce seizures and lethality in mammals. Anticonvulsant and neuroprotective properties of N-methyl-D-aspartate (NMDA) antagonists encourage the investigation of their effects in AChE inhibitor-induced poisonings. In the present study, the effects of dizocilpine (MK-801, 1 mg/kg) or 3-((RS)-2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP, 10 mg/kg), alone or combined with muscarinic antagonist atropine (1.8 mg/kg), on convulsant and lethal properties of an OP pesticide dichlorvos or a carbamate drug physostigmine, were studied in mice. Both dichlorvos and physostigmine induced dose-dependent seizure activity and lethality. Atropine did not prevent the occurrence of convulsions but decreased the lethal effects of both dichlorvos and physostigmine. MK-801 or CPP blocked or attenuated, respectively, dichlorvos-induced convulsions. Contrariwise, NMDA antagonists had no effect in physostigmine-induced seizures or lethality produced by dichlorvos or physostigmine. Concurrent pretreatment with atropine and either MK-801 or CPP blocked or alleviated seizures produced by dichlorvos, but not by physostigmine. Both MK-801 and CPP co-administered with atropine enhanced its antilethal effects in both dichlorvos and physostigmine poisoning. In both saline- and AChE inhibitor-treated mice, no interaction of the investigated antidotes with brain cholinesterase was found. The data indicate that both muscarinic ACh and NMDA receptor-mediated mechanisms contribute to the acute toxicitymore » of AChE inhibitors, and NMDA receptors seem critical to OP-induced seizures.« less

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. Department of Toxicology, Institute of Agricultural Medicine, 20-090 Lublin (Poland). E-mail: andrzej.dekundy@merz.de
  2. Department of Toxicology, Institute of Agricultural Medicine, 20-090 Lublin (Poland)
  3. (Poland)
Publication Date:
OSTI Identifier:
20976875
Resource Type:
Journal Article
Resource Relation:
Journal Name: Toxicology and Applied Pharmacology; Journal Volume: 219; Journal Issue: 2-3; Other Information: DOI: 10.1016/j.taap.2006.10.030; PII: S0041-008X(06)00410-8; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; ATROPINE; BRAIN; CARBAMATES; CHOLINESTERASE; ESERINE; MICE; PESTICIDES; PHOSPHONIC ACIDS; POISONING; RECEPTORS; TOXICITY

Citation Formats

Dekundy, Andrzej, Kaminski, Rafal M., Zielinska, Elzbieta, Turski, Waldemar A., and Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin. NMDA antagonists exert distinct effects in experimental organophosphate or carbamate poisoning in mice. United States: N. p., 2007. Web. doi:10.1016/j.taap.2006.10.030.
Dekundy, Andrzej, Kaminski, Rafal M., Zielinska, Elzbieta, Turski, Waldemar A., & Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin. NMDA antagonists exert distinct effects in experimental organophosphate or carbamate poisoning in mice. United States. doi:10.1016/j.taap.2006.10.030.
Dekundy, Andrzej, Kaminski, Rafal M., Zielinska, Elzbieta, Turski, Waldemar A., and Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin. Thu . "NMDA antagonists exert distinct effects in experimental organophosphate or carbamate poisoning in mice". United States. doi:10.1016/j.taap.2006.10.030.
@article{osti_20976875,
title = {NMDA antagonists exert distinct effects in experimental organophosphate or carbamate poisoning in mice},
author = {Dekundy, Andrzej and Kaminski, Rafal M. and Zielinska, Elzbieta and Turski, Waldemar A. and Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin},
abstractNote = {Organophosphate (OP) and carbamate acetylcholinesterase (AChE) inhibitors produce seizures and lethality in mammals. Anticonvulsant and neuroprotective properties of N-methyl-D-aspartate (NMDA) antagonists encourage the investigation of their effects in AChE inhibitor-induced poisonings. In the present study, the effects of dizocilpine (MK-801, 1 mg/kg) or 3-((RS)-2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP, 10 mg/kg), alone or combined with muscarinic antagonist atropine (1.8 mg/kg), on convulsant and lethal properties of an OP pesticide dichlorvos or a carbamate drug physostigmine, were studied in mice. Both dichlorvos and physostigmine induced dose-dependent seizure activity and lethality. Atropine did not prevent the occurrence of convulsions but decreased the lethal effects of both dichlorvos and physostigmine. MK-801 or CPP blocked or attenuated, respectively, dichlorvos-induced convulsions. Contrariwise, NMDA antagonists had no effect in physostigmine-induced seizures or lethality produced by dichlorvos or physostigmine. Concurrent pretreatment with atropine and either MK-801 or CPP blocked or alleviated seizures produced by dichlorvos, but not by physostigmine. Both MK-801 and CPP co-administered with atropine enhanced its antilethal effects in both dichlorvos and physostigmine poisoning. In both saline- and AChE inhibitor-treated mice, no interaction of the investigated antidotes with brain cholinesterase was found. The data indicate that both muscarinic ACh and NMDA receptor-mediated mechanisms contribute to the acute toxicity of AChE inhibitors, and NMDA receptors seem critical to OP-induced seizures.},
doi = {10.1016/j.taap.2006.10.030},
journal = {Toxicology and Applied Pharmacology},
number = 2-3,
volume = 219,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}