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[Comparison of the cholinoreceptor and cholinesterase properties of the frog Rana temporaria and the squid Todarodes pacificus].

Studies have been made on the interaction of several groups of quartenary ammonium salts with cholinoreceptors of m. rectus abdominis of the frog Rana temporaria, and isolated m. retractor infundibuli of the octopus Todarodes pacificus, as well as with cholinesterases of the frog brain and visual ganglia of the octopus. The derivatives of polymethylene bis(trimethylammonium) compounds, being cholinomimetic drugs for frog muscle, do not exert cholinomimetic influence on octopus muscle. The same difference with respect to their effect on frog and octopus receptors was found in anabazin derivatives. Among amide derivatives of acetylcholine, the strongest mimetic effect on cholinoreceptors of both animals was exhibited by a piperazine isolog with gauche-conformation, whereas N-methyl isolog with trans-conformation was found to be the strongest inhibitor of cholinesterases. Cholinoreceptors and cholinesterase of the octopus were less sensitive to the effect of the investigated quartenary ammonium salts than those of the frog.