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Effects of various experimental manipulations on neostriatal acetylcholine and dopamine release

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Abstract

The release of endogenous acetylcholine and dopamine and the appearance of their metabolites, choline and dihydroxyphenylacetic acid (DOPAC), from neostriatal slices prepared from Fischer 344 rats was examined under various experimental conditions. There was a dose-dependent increase in the amount of neurotransmitter or metabolite as the medium potassium concentration was increased from 5 to 50 mM. Over an eight minute period in Krebs Ringer bicarbonate buffer containing 25 mM potassium, the rate of release of acetylcholine was 6 to 13 times greater than that of dopamine. The dopamine endogenous to the slice preparation appeared to have little effect on the release of endogenous acetylcholine since manipulations that significantly altered dopamine release (depletion with 6-hydroxydopamine or uptake inhibition with nomifensine) had minimal effects on the cholinergic neurons. In contrast, increasing the endogenous acetylcholine in the preparation by inhibiting acetylcholinesterase resulted in a 1.2 to 12 fold increase in dopamine release depending upon the incubation time and the potassium concentration. These studies indicate that within the neostriatal slices there is minimal influence of the endogenous dopamine on the cholinergic neurons, whereas the extracellular acetylcholine can influence dopamine release when its concentration is increased by inhibition of acetylcholinesterase.

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Authors and Affiliations

  1. School of Pharmacy and Environmental Toxicology Center, University of Wisconsin, 425 North Charter Street, 53706, Madison, WI

    Hwa-Jung Lee & Molly H. Weiler

  2. Roquette Corporation, 1550 Northwestern Ave., 60031, Gurnee, IL

    Lisa M. Alcorn

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  1. Hwa-Jung Lee
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  2. Lisa M. Alcorn
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  3. Molly H. Weiler
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Lee, HJ., Alcorn, L.M. & Weiler, M.H. Effects of various experimental manipulations on neostriatal acetylcholine and dopamine release. Neurochem Res 16, 875–883 (1991). https://doi.org/10.1007/BF00965536

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