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Cholinergic properties of new 7-methoxytacrine-donepezil derivatives.

Journal article
Authors Vendula Sepsova
Jana Z Karasova
Gunnar Tobin
Daniel Jun
Jan Korabecny
Pavla Cabelova
Katerina Janska
Jan Krusek
Kristyna Skrenkova
Kamil Kuca
Ondrej Soukup
Published in General physiology and biophysics
Volume 34
Issue 2
Pages 189-200
ISSN 0231-5882
Publication year 2015
Published at Institute of Neuroscience and Physiology, Department of Pharmacology
Pages 189-200
Language en
Links dx.doi.org/10.4149/gpb_2014036
Subject categories Pharmacology

Abstract

Organophosphorus nerve agents inhibit acetylcholinesterase (AChE) which causes the breakdown of the transmitter acetylcholine (ACh) in the synaptic cleft. Overstimulation of cholinergic receptors (muscarinic and nicotinic) by excessive amounts of ACh causes several health problems and may even cause death. Reversible AChE inhibitors play an important role in prophylaxis against nerve agents. The presented study investigated whether 7-methoxytacrine (7-MEOTA) and 7-MEOTA-donepezil derivatives can act as central and peripheral reversible AChE inhibitors and simultaneously antagonize muscarinic and nicotinic receptors. The possible mechanism of action was studied on cell cultures (patch clamp technique, calcium mobilization assay) and on isolated smooth muscle tissue (contraction study). Furthermore, the kinetics of the compounds were also examined. CNS availability was predicted by determining the passive blood-brain barrier penetration estimated via a modified PAMPA assay. In conclusion, this study provides promising evidence that the new synthesized 7-MEOTA-donepezil derivatives have the desired anticholinergic effect; they can inhibit AChE, and nicotinic and muscarinic receptors in the micromolar range. Furthermore, they seem to penetrate readily into the CNS. However, their real potency and benefit must be verified by in vivo experiments.

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