A Comparison of the Potency of Newly Developed Oximes (K347, K628) and Currently Available Oximes (Obidoxime, HI-6) to Counteract Acute Neurotoxic Effects of Tabun in Rats

Kassa, Jiří; Žďárová Karasová, Jana; Tesařová, Sandra; Musílek, Kamil; Kuča, Kamil

doi:10.14712/18059694.2016.65

Acta Medica > Archive > 2010, Vol. 53 > Issue 2 > A Comparison of the Potency of Newly…

Acta Med. 2010, 53: 85-91

https://doi.org/10.14712/18059694.2016.65

A Comparison of the Potency of Newly Developed Oximes (K347, K628) and Currently Available Oximes (Obidoxime, HI-6) to Counteract Acute Neurotoxic Effects of Tabun in Rats

Jiří Kassa^a, Jana Žďárová Karasová^a, Sandra Tesařová^b, Kamil Musílek^a, Kamil Kuča^c

^aUniversity of Defence, Faculty of Military Health Sciences, Department of Toxicology, Hradec Králové, Czech Republic
^bThe 7th Field Hospital of the Czech Army, Hradec Králové, Czech Republic
^cUniversity of Defence, Faculty of Military Health Sciences, Center of Advanced Studies, Hradec Králové, Czech Republic

Received February 26, 2010
Accepted May 10, 2010

The ability of newly developed oximes (K347, K628) to reduce tabun-induced acute neurotoxic signs and symptoms was compared with currently available oximes (obidoxime, HI-6) using a functional observational battery. The neuroprotective effects of the oximes studied (K347, K628, obidoxime, HI-6) combined with atropine on rats poisoned with tabun at a sublethal dose (220 μg/kg i.m.; 80 % of LD₅₀ value) were evaluated. Tabun-induced neurotoxicity was monitored by a functional observational battery and automatic measurement of motor activity at 24 hours following tabun challenge. The results indicate that all tested oximes combined with atropine enable tabun-poisoned rats to survive 24 hours following tabun challenge. Both newly developed oximes (K347, K628) combined with atropine are able to decrease tabun-induced neurotoxicity in the case of sublethal poisonings but they do not eliminate all tabun-induced acute neurotoxic signs and symptoms. Their ability to decrease the tabun-induced acute neurotoxicity is higher than that of the oxime HI-6 and it is slightly slower than the neuroprotective efficacy of obidoxime. As the neuroprotective potency of both newly developed oximes (K347, K628) is not as high as the potency of obidoxime, they are not a suitable replacement for obidoxime for the treatment of acute tabun poisonings.