title: A comparison of the reactivating and therapeutic efficacy of newly developed bispyridinium oximes (K250, K251) with commonly used oximes against tabun in rats and mice.
abstract: The potency of newly developed bispyridinium compounds (K250, K251) in reactivating tabun-inhibited acetylcholinesterase and reducing tabun-induced lethal toxic effects was compared with currently available oximes (obidoxime, trimedoxime, the oxime HI-6) using in vivo methods. Studies determined percentage of reactivation of tabun-inhibited blood and tissue AChE in poisoned rats and showed that the reactivating efficacy of both newly developed oximes is comparable with the oxime HI-6 but it is significantly lower than the reactivating effects of obidoxime and trimedoxime, especially in diaphragm and brain. Both newly developed oximes were also found to be able to slightly reduce lethal toxic effects in tabun-poisoned mice. Their therapeutic efficacy is higher than the potency of the oxime HI-6 but it is lower than the therapeutic effects of trimedoxime and obidoxime. Thus, the reactivating and therapeutic potency of both newly developed oximes (K250, K251) does not prevail over the effectiveness of currently available oximes and, therefore, they are not suitable for their replacement for the treatment of acute tabun poisoning.
authors: Department of Toxicology, Faculty of Military Health Sciences, Hradec Kralove, Czech Republic. kassa@pmfhk.cz
authors: Jiri
authors: J
authors: Kassa
authors: Jana
authors: J
authors: Karasova
authors: Jiri
authors: J
authors: Bajgar
authors: Kamil
authors: K
authors: Kuca
authors: Kamil
authors: K
authors: Musilek
authors: Irena
authors: I
authors: Kopelikova
mesh_terms: D000818:Animals; D000931:Antidotes / Q000494:pharmacology*; D002800:Cholinesterase Inhibitors / Q000633:toxicity; D002801:Cholinesterase Reactivators / Q000494:pharmacology; D008297:Male; D051379:Mice; D009768:Obidoxime Chloride / Q000494:pharmacology; D010755:Organophosphates / Q000633:toxicity*; D010091:Oximes / Q000737:chemistry / Q000494:pharmacology*; D011726:Pyridinium Compounds / Q000737:chemistry / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D014289:Trimedoxime / Q000494:pharmacology
chemical_list: C546897:1-(4-carboxypyridinium)-4-(4-hydroxyiminomethylpyridinium)-but-2-ene; C546898:1-(4-hydroxyiminomethylpyridinium)-4-(4-methylcarbonylpyridinium)-but-2-ene; D000931:Antidotes; D002800:Cholinesterase Inhibitors; D002801:Cholinesterase Reactivators; D010755:Organophosphates; D010091:Oximes; D011726:Pyridinium Compounds; D009768:Obidoxime Chloride; D014289:Trimedoxime; C009374:tabun