Soukup_2011_Physiol.Res_60_679

Reference

Title : Oxime reactivators and their in vivo and in vitro effects on nicotinic receptors - Soukup_2011_Physiol.Res_60_679
Author(s) : Soukup O , Krusek J , Kaniakova M , Kumar UK , Oz M , Jun D , Fusek J , Kuca K , Tobin G
Ref : Physiol Res , 60 :679 , 2011
Abstract :

Current treatment of organophosphorus poisoning, resulting in overstimulation and desensitization of muscarinic and nicotinic receptors by acetylcholine (ACh), consists of the administration of atropine and oxime reactivators. However, no versatile oxime reactivator has been developed yet and some mortality still remains after application of standard atropine treatment, probably due to its lack of antinicotinic action. In our study, we focused on the interesting non-acetylcholinesterase property of oximes, i.e. antinicotinic effect of reactivators. Two standard reactivators (HI-6, obidoxime) and two new compounds (K027 and K203) were chosen for in vitro (patch clamp) and in vivo (nerve-evoked muscle contraction) testings. Both examinations showed antinicotinic effects of the reactivators. In vitro inhibition of acetylcholine-evoked currents by obidoxime, HI-6 and K203 was equivalent while K027 was less potent. Similar order of potency was observed by the in vivo examinations. We thus confirm previous in vitro results, which describe antinicotinic effects of oxime reactivators, and furthermore, we show in vivo antagonism of oxime reactivators exerted by the inhibition of ACh effect on the nicotinic receptor in the neuromuscular junction. Taking together, the effects of tested oxime reactivators indicate an antagonism on both embryonic and adult form of the muscle nicotinic receptors.

PubMedSearch : Soukup_2011_Physiol.Res_60_679
PubMedID: 21574759

Related information

Reactivator K027    K203

Citations formats

Soukup O, Krusek J, Kaniakova M, Kumar UK, Oz M, Jun D, Fusek J, Kuca K, Tobin G (2011)
Oxime reactivators and their in vivo and in vitro effects on nicotinic receptors
Physiol Res 60 :679

Soukup O, Krusek J, Kaniakova M, Kumar UK, Oz M, Jun D, Fusek J, Kuca K, Tobin G (2011)
Physiol Res 60 :679