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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Spontaneous release of acetylcholine from Torpedo synaptosomes: effect of cetiedil and its analogue MR 16728.

The effects of cetiedil and its analogue MR 16728 were examined on spontaneous acetylcholine release measured with a chemiluminescent assay using choline oxidase in a synaptosomal suspension obtained from Torpedo marmorata electric organ. Evoked acetylcholine release is inhibited by cetiedil, whereas this drug enhances spontaneous extracellular Ca(2+)-independent acetylcholine release (up to 340%). This effect was examined as a function of cetiedil concentration and incubation time. On the other hand, the analogue MR 16728, which enhances A23187-evoked acetylcholine release, also enhances spontaneous Ca(2+)-independent acetylcholine release. Cetiedil and MR 16728 effects on spontaneous acetylcholine release were also examined in the presence of Ca2+. Addition of Ca2+ enhanced spontaneous acetylcholine release by 75%, and cetiedil and MR 16728 stimulation was maintained but with different levels of enhancement. Thus, these results show that the processes responsible for evoked and spontaneous acetylcholine release are sensitive but in different ways to drugs of the cetiedil family.[1]

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