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Oxime K033-Reactivation Activity of Cholinesterases Inhibited by Various Nerve Agents and Organophosphorus Pesticides

[ Vol. 15 , Issue. 11 ]

Author(s):

Kamil Kuca*, Kamil Musilek, Daniel Jun, Jaroslav Pejchal, Ondrej Krejcar, Marek Penhaker, Qinghua Wu, Raquel O. Lopes, Teodorico C. Ramalho, Tanos C.C. Franca, Eugenie Nepovimova and Ondrej Soukup   Pages 1124 - 1130 ( 7 )

Abstract:


Background: Oxime K033 was considered a promising drug candidate originally developed for the treatment of nerve agent poisoning. This study summarizes its potency to reactivate in vitro acetylcholinesterase inhibited by several nerve agents (tabun, sarin, cyclosarin, soman, VX, Russian VX), mimic agent (DFP) and organophosphorus pesticide (chlorpyrifos) to show whether this compound might be used in cases of nerve agent or pesticide poisoning and considered as a so-called “broad spectrum reactivator”.

Methods: Moreover, docking studies of tested oxime with human AChE (HssAChE) complexed with several OPs were performed in order to verify its stability, binding modes and ability to adopt favourable conformations and to perform the reactivation reaction with each OP under experimental study.

Results & Conclusion: According to the obtained results, K033 could not be considered a universal antidote due to its poor reactivation activity in the case of tabun-, soman- and DFP-inhibited rat acetylcholinesterase. On the contrary, its very good in vitro potency in human-relevant doses for cyclosarin inhibition is highlighted.

Keywords:

Oxime, K033, nerve agent, pesticide, antidote, cholinesterase, reactivator.

Affiliation:

Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Center for Biomedical Research, University Hospital Hradec Kralove, Hradec Kralove, Center for Biomedical Research, University Hospital Hradec Kralove, Hradec Kralove, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Laboratory of Molecular Modelling Applied to the Chemical and Biological Defense, Military Institute of Engineering, Rio de Janeiro, RJ, Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Center for Biomedical Research, University Hospital Hradec Kralove, Hradec Kralove

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