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• W2024129658 abstract "1. Tetramonoisopropyl pyrophosphortetramide (iso-OMPA) added for 15 min to the rat isolated phrenic nerve-diaphragm in a concentration of 30 muM, produced a complete selective and stable inhibition of cholinesterase. A concentration of 3 muM produced near complete inhibition of cholinesterase, and a concentration of 300 muM also inhibited acetylcholinesterase marginally.2. Inhibition of cholinesterase was associated with a sustained increase in the neuromuscular blocking action of exogenous butyrylcholine but not of exogenous acetylcholine. Iso-OMPA, 300 muM, in addition caused transient increases in the sensitivity of the rat diaphragm to exogenous acetylcholine and butyrylcholine. In the same concentration, it had a curare-like action on the frog rectus abdominis muscle preparation.3. Iso-OMPA, 30 muM, caused reversible increases in the amplitude of the twitch response and tetanic responses, which were of a similar magnitude in the indirectly stimulated preparation and the directly stimulated curarized preparation. Caffeine had a similar effect on the twitch response and its effectiveness was increased by iso-OMPA, and vice-versa. Amongst anticholinesterases, octamethyl pyrophosphortetramide and tetraethylpyrophosphate also enhanced the amplitude of the tetanic response, but paraoxon, dyflos, and mipafox did not.4. It is concluded that iso-OMPA, in concentrations (3 and 30 muM) which in 15 min give near maximal or maximal selective inhibition of cholinesterase, has no effect on the transmission of nerve impulses at the neuromuscular junction, but enhances reversibly the amplitude of the contractile response to stimulation by a direct action upon the muscle fibre, which involves a mechanism related to but not identical with that by which caffeine potentiates twitch tension. In higher concentrations, iso-OMPA has a curare-like action at the neuromuscular junction." @default.
• W2024129658 created "2016-06-24" @default.
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• W2024129658 date "1972-12-01" @default.
• W2024129658 modified "2023-10-18" @default.
• W2024129658 title "Actions of the selective inhibitor of cholinesterase tetramonoisopropyl pyrophosphortetramide on the rat phrenic nerve-diaphragm preparation" @default.
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• W2024129658 doi "https://doi.org/10.1111/j.1476-5381.1972.tb06896.x" @default.
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