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- W2151581816 abstract "The effects of cholinergic agonists and antagonists on the release of ATP from isolated myenteric varicosities were studied using a firefly luciferin-luciferase technique. In a previous study, acetylcholine and nicotine released ATP from isolated myenteric varicosities, whereas the muscarinic agonist bethanechol did not. In the present study, release of ATP by acetylcholine was shown to be Ca2+ dependent. d-Tubocurarine competitively antagonized the release of ATP by either acetylcholine or nicotine. Maximal release of ATP by acetylcholine (10(-3) M) was approximately 24% that observed with the depolarizing drug veratridine (5 X 10(-5) M), suggesting either that not all of the varicosities capable of releasing ATP possess nicotinic receptors or that acetylcholine does not depolarize the varicosities to the degree that veratridine does. Tetrodotoxin slightly but significantly reduced ATP release induced by acetylcholine or nicotine, indicating some involvement of Na+ channels in the release process. Finally, 6-hydroxydopamine pretreatment produced a 48% reduction in the acetylcholine-evoked release of ATP, suggesting that much, but possibly not all, of the ATP release occurs from noradrenergic varicosities present in the preparation." @default.
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- W2151581816 date "1983-04-01" @default.
- W2151581816 modified "2023-10-18" @default.
- W2151581816 title "Acetylcholine Releases ATP from Varicosities Isolated from Guinea Pig Myenteric Plexus" @default.
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- W2151581816 doi "https://doi.org/10.1111/j.1471-4159.1983.tb08094.x" @default.
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