A comparison of the potency of a novel bispyridinium oxime K203 and currently available oximes (obidoxime, HI-6) to counteract the acute neurotoxicity of sarin in rats.

Jiri Kassa, Jan Misik, Jana Zdarova Karasova

Index: Basic Clin Pharmacol Toxicol. 111(5) , 333-8, (2012)

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Abstract

The neuroprotective effects of a newly developed oxime K203 and currently available oximes (obidoxime, HI-6) in combination with atropine in rats poisoned with sarin were studied. The sarin-induced neurotoxicity was monitored using a functional observatory battery at 2 hr after sarin challenge. The results indicate that the potency of a novel bispyridinium oxime K203 to counteract sarin-induced neurotoxicity is relatively low and roughly corresponds to the neuroprotective efficacy of obidoxime. Among tested oximes, the oxime HI-6 seems to be significanlty more efficacious to counteract acute neurotoxicity of sarin than commonly used obidoxime and a newly developed oxime K203. Thus, the oxime K203 does not provide any beneficial effect for the antidotal treatment of acute poisoning with sarin in comparison with the oxime HI-6 that should be considered to be the best oxime for antidotal treatment of acute sarin poisonings.© 2012 The Authors Basic & Clinical Pharmacology & Toxicology © 2012 Nordic Pharmacological Society.