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• W2146455514 abstract "Abstract— Rat striatal slices were incubated with [2-14C]pyruvate or [6-14C]glucose as sole carbon source. The method devised to study the accumulation of labelled ACh in tissues and incubating medium in the presence or absence of eserine 200 μM derived from the previous studies of FONNUM (1969) and Hemsworth and Morris (1964). Total ACh was estimated by biological assay. The specific activity of newly synthesized ACh was found to be equal to that of the precursors, even for short incubation times and low substrates concentrations. When slices were incubated with [2-14C]pyruvate and eserine, the spontaneous release of ACh occurred at a constant rate, was not modified by the addition of 2 mM-choline in the medium, and consisted only of newly synthesized transmitter. The initial rate of ACh synthesis was found to be independent of choline concentration, but dependent on the [2-14C]pyruvate concentration, and reached a maximal value corresponding to about 5 per cent of the measured striatal choline acetyltransferase activity. The appearance of the so called ‘surplus ACh’ pool, obtained in the presence of eserine, could be detected only after 30 min and represented 26 per cent of the total tissue ACh content after 180 min of incubation. In the absence of eserine, tissue ACh levels increased six-fold in 80 min and then remained stable until the end of the incubation period (180 min), if sufficient substrate was provided. The maximal ACh accumulation in slices was independent of both excess of choline and [2-14C]pyruvate. The ‘ACh plateau’ represented the attainment of a new dynamic equilibrium, since ACh synthesis could still be stimulated by 30 mM-K+. From these results, it was concluded that ACh synthesis is controlled by a negative feed-back regulation." @default.
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• W2146455514 date "1973-04-01" @default.
• W2146455514 modified "2023-10-18" @default.
• W2146455514 title "ACETYLCHOLINE SYNTHESIS FROM [2-14C]PYRUVATE IN RAT STRIATAL SLICES" @default.
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• W2146455514 doi "https://doi.org/10.1111/j.1471-4159.1973.tb00079.x" @default.
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