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- W289220565 abstract "1. Cerebral-cortex synaptosomes were shown to synthesize (14C)acetylcholine after incubation with (14C)choline, and 25mM-KCl released (14C)acetylcholine (but not (14C)choline) into the medium by a Ca2+-dependent and Mg2+-sensitive process. 2. The K+-stimulated release of (14C)acetylcholine was inhibited by more than 80% after preincubation of the synaptosomes with 10(5) mouse lethal doses of botulinum toxin/ml. (14C)choline uptake, (14C)acetylcholine synthesis, intrasynaptosomal K+ and occluded lactate dehydrogenase were unaffected by the toxin. It also failed to prevent the K+-stimulated release of (3H)noradrenaline and (14C)glycine from synaptosomes. 3. Fractionation of hypo-osmotically shocked synaptosomes revealed that more than 75% of the radioactive acetylcholine was in the cytoplasmic compartment, although the vesicle pellet contained more total acetylcholine than the cytoplasmic pool. Consequently the specific radioactivity of acetylcholine in the cytoplasmic pool was almost 5 times that of the vesicles. This distribution was unaffected by preincubation with botulinum toxin. It is concluded that the toxin acts directly on the release of acetylcholine, rather than influencing its storage. 4. After K+-stimulation, toxin-inhibited synaptosomes contained increased amounts of total acetylcholine, which suggests that its rate of synthesis is controlled by depolarization rather than release." @default.
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- W289220565 date "1976-06-15" @default.
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- W289220565 title "Inhibition by botulinum toxin of depolarization-evoked release of (14C)acetylcholine from synaptosomes <i>in vitro</i>" @default.
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- W289220565 doi "https://doi.org/10.1042/bj1560701" @default.
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