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• W2896816391 endingPage "225" @default.
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• W2896816391 abstract "Poisoning by organophosphorus compounds (OP) is characterized by inhibition of the key enzyme acetylcholinesterase (AChE) and potentially fatal outcomes in humans. Insufficient efficacy of the standard therapy with atropine and AChE reactivators (oximes) against certain OP initiated synthesis of novel non-oxime reactivators basing on the common structure 4-amino-2-((diethylamino)methyl)phenol (ADOC). Recently, we reported of a pyrrolidine-bearing ADOC analogue (3 l) with a remarkable ability to reactivate OP-inhibited AChE. This in vitro study was undertaken to determine reactivity, affinity and overall reactivation constants of 3 l, the reference compound ADOC and two structural analogues with human AChE inhibited by paraoxon, sarin, cyclosarin and VX. The data showed a 10 to 34-fold reactivating potency of 3 l compared to ADOC mainly due to improved affinity. Additionally, various interactions between non-oximes, human or guinea pig (GP) AChE and structurally different OP were investigated: OP-inhibited guinea pig AChE was less amenable to reactivation by ADOC and 3 l than human AChE. Compound 3 l was considered as potential pretreatment to prevent AChE from irreversible inhibition by OP: In the presence of 10 μM 3 l inhibition of native human AChE was attenuated resulting in protective indices (PI) ranging from about 2.7 to 6.0. A combination of 3 l and the bispyridinium oxime HI-6 was tested to reactivate OP-inhibited AChE: The superior reactivator of the respective OP-AChE combination dominated the reactivation process and a synergistic effect could not be observed. In conclusion, novel non-oxime reactivators like 3 l may be considered as promising templates for the design of more potent therapeutics against poisoning by highly toxic OP." @default.
• W2896816391 created "2018-10-26" @default.
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• W2896816391 date "2018-12-01" @default.
• W2896816391 modified "2023-10-07" @default.
• W2896816391 title "Interactions between acetylcholinesterase, toxic organophosphorus compounds and a short series of structurally related non-oxime reactivators: Analysis of reactivation and inhibition kinetics in vitro" @default.
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• W2896816391 doi "https://doi.org/10.1016/j.toxlet.2018.10.004" @default.
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