Ca2+o‐Independent Veratridine‐Evoked Acetylcholine Release from Striatal Slices Is Not Inhibited by Vesamicol (AH5183): Mobilization of Distinct Transmitter Pools
作者:
Vera Adam‐Vizi,
Z. Deri,
E. S. Vizi,
H. Sershen,
A. Lajtha,
期刊:
Journal of Neurochemistry
(WILEY Available online 1991)
卷期:
Volume 56,
issue 1
页码: 52-58
ISSN:0022-3042
年代: 1991
DOI:10.1111/j.1471-4159.1991.tb02561.x
出版商: Blackwell Publishing Ltd
关键词: Vesamicol;Veratridine;Acetylcholine release;Ca2+o‐independent release
数据来源: WILEY
摘要:
Abstract:The effect of 2‐(4‐phenylpiperidino)cyclohexanol (AH5183 or vesamicol), a compound known to block the uptake of acetylcholine (ACh) into cholinergic synaptic vesicles, on the release of endogenous and [14C]ACh from slices of rat striatum was investigated. ACh release was evoked either by electrical stimulation or by veratridine. The effect of electrical stimulation was entirely dependent on external Ca2+. By contrast, veratridine (40 μM) also enhanced ACh release in the absence of Ca2+. Indeed, with veratridine two components were clearly distinguished: one dependent on external Ca2+and the other not. Vesamicol inhibited [14C]ACh release evoked by both veratridine and electrical stimulation in the presence of external Ca2+, provided it was added to the tissue prior to loading with [14C]choline. With the same treatment vesamicol only slightly affected the release of endogenous ACh. Under the same conditions the Ca2+‐independent [14C]ACh release evoked by veratridine was not prevented by vesamicol. The differential responsiveness to vesamicol suggests that ACh pools involved in Ca2+o‐dependent ACh release are different from those mobilized during Ca2+o‐independent A
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