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- W2068756211 abstract "Vesamicol (AH5183) is an inhibitor (IC50, 50 nM) of acetylcholine (ACh) vesicle packaging. Vesamicol increases the phosphorylation pattern of synaptophysin (p38), identified as a vesicle-specific phosphoprotein involved in vesicle-mediated neurotransmitter release. Percoll fractionation of the rat cortex yielded a cholinergic-enriched synaptosomal Fraction 4. Fraction 4 contained the highest enrichment of cholineacetyl-transferase activity (86 +/- 4.6 mumole AcCh/g protein/hr.) in the Percoll gradient. Fraction 4 demonstrated oxygen consumption (108 +/- 23.4 nmole/mg protein), levels of adenosine triphosphate, ATP, (10.29 +/- 0.45 nmole/mg protein) and adenosine diphosphate, ADP, (10.54 +/- 2.72 nmole/mg protein), energy potential (ATP/[ADP] [Pi], (0.49) phosphate uptake (65-80 nmoles phosphate/mg tissue), 32Pi labelling (130 +/- 12 x 10(5) DPM/mg tissue; 74 +/- 9.8 x 10(2) nmoles phosphate/mg tissue). Synaptophysin was identified by Western blotting and confirmed by qualitative immunoprecipitation. Synaptophysin phosphorylation was confirmed by autoradiograph. Synaptophysin phosphorylation increased (225%) in the presence of vesamicol (ED50, 1 nM) in Fraction 4. Vesamicol (50 nM) and vanadate (54 microM) were compared for their effects on synaptophysin. This study suggests that during the inhibition of acetylcholine packaging by vesamicol that synaptophysin is phosphorylated. Therefore, the phosphorylation and dephosphorylation of synaptophysin may be involved in the transport of acetylcholine in or out of the synaptic vesicle." @default.
- W2068756211 created "2016-06-24" @default.
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- W2068756211 date "1996-11-01" @default.
- W2068756211 modified "2023-10-14" @default.
- W2068756211 title "Vesamicol, an inhibitor of acetylcholine vesicle packaging, increases synaptophysin phosphorylation in rat cortical synaptosomes" @default.
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- W2068756211 doi "https://doi.org/10.1016/s0024-3205(96)00568-1" @default.
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