Efficacy Assessment of an Uncharged Reactivator of NOP-Inhibited Acetylcholinesterase Based on Tetrahydroacridine Pyridine-Aldoxime Hybrid in Mouse Compared to Pralidoxime.
Fiche publication
Date publication
juin 2020
Journal
Biomolecules
Auteurs
Membres identifiés du Cancéropôle Est :
Dr VILLA Pascal
Tous les auteurs :
Calas AG, Hanak AS, Jaffré N, Nervo A, Dias J, Rousseau C, Courageux C, Brazzolotto X, Villa P, Obrecht A, Goossens JF, Landry C, Hachani J, Gosselet F, Dehouck MP, Yerri J, Kliachyna M, Baati R, Nachon F
Lien Pubmed
Résumé
(1) Background: Human exposure to organophosphorus compounds employed as pesticides or as chemical warfare agents induces deleterious effects due to cholinesterase inhibition. One therapeutic approach is the reactivation of inhibited acetylcholinesterase by oximes. While currently available oximes are unable to reach the central nervous system to reactivate cholinesterases or to display a wide spectrum of action against the variety of organophosphorus compounds, we aim to identify new reactivators without such drawbacks. (2) Methods: This study gathers an exhaustive work to assess in vitro and in vivo efficacy, and toxicity of a hybrid tetrahydroacridine pyridinaldoxime reactivator, KM297, compared to pralidoxime. (3) Results: Blood-brain barrier crossing assay carried out on a human in vitro model established that KM297 has an endothelial permeability coefficient twice that of pralidoxime. It also presents higher cytotoxicity, particularly on bone marrow-derived cells. Its strong cholinesterase inhibition potency seems to be correlated to its low protective efficacy in mice exposed to paraoxon. Ventilatory monitoring of KM297-treated mice by double-chamber plethysmography shows toxic effects at the selected therapeutic dose. This breathing assessment could help define the No Observed Adverse Effect Level (NOAEL) dose of new oximes which would have a maximum therapeutic effect without any toxic side effects.
Mots clés
blood-brain barrier crossing, cholinesterase, organophosphorus nerve agents, oxime, pharmacodynamics, reactivation, ventilation
Référence
Biomolecules. 2020 Jun 4;10(6):