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• W2034127962 startingPage "843" @default.
• W2034127962 abstract "Abstract Choline (Ch) is an essential nutrient as the biosynthetic precursor of acetylcholine (ACh) and phospholipids. Under resting conditions, the intracellular accumulation of Ch (above 10‐fold), which is positively charged, is governed by the membrane potential and follows the Nernst equation. Accordingly, in synaptosomes from adult rats during depolarization, we observed a linear relationship between release of free cytoplasmic Ch and KCl concentration (2.7–120 m m ). The K + ‐evoked Ch release was Ca 2+ ‐independent and did not originate from ACh or phospholipid hydrolysis. In superfused brain slices of adult rats, however, a K + ‐induced Ch efflux was absent. Also, under in vivo conditions, 30–60 m m KCl failed to increase the extracellular Ch level as shown by microdialysis in adult rat hippocampus. On the contrary, in brain slices from 1‐week‐old rats, high K + as well as 4‐aminopyridine evoked a marked Ch efflux in a concentration‐dependent fashion. This phenomenon faded within 1 week. Hemicholinium‐3 (HC‐3, 1␣and 10 µ m ), a blocker of cellular choline uptake, caused a marked efflux of choline from adult rat slices but no or significantly less release from immature slices. We conclude that depolarization of synaptic endings causes a Ca 2+ ‐independent release of free cytoplasmic Ch into the extracellular space. In adult rat brain, this elevation of Ch is counteracted by a homeostatic mechanism such as uptake into brain cells." @default.
• W2034127962 created "2016-06-24" @default.
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• W2034127962 date "2002-03-01" @default.
• W2034127962 modified "2023-10-13" @default.
• W2034127962 title "A homeostatic mechanism counteracting K⁺‐evoked choline release in adult brain" @default.
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• W2034127962 doi "https://doi.org/10.1046/j.0022-3042.2001.00754.x" @default.
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