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Classical Noncholinergic Neurotransmitters and the Vesicular Transport System for Acetylcholine
Authors:Edward D Clarkson  Ben A Bahr  Stanley M Parsons
Institution:Department of Chemistry and the Neuroscience Research Institute, University of California, Santa Barbara, California, U.S.A.
Abstract:Abstract: The acetylcholine transporter exhibits such low affinity and specificity for acetylchoiine that it appeared possible it could fail to select against other neurotransmitters. Potential interactions of classical noncholinergic neurotransmitters with cholinergic synaptic vesicles purified from electric organ were studied. No active transport of 3H]serotonin, 3H]noradrenaline, or 3H]glutamate occurred. Serotonin, noradrenaline, and N -acetylaspartyl glutamate inhibited active transport of 3H]acetylcholine by the vesicles. Dopamine previously had been shown to inhibit transport. Glutamate and γ-aminobutyric acid were shown here not to inhibit active transport of 3H]-acetylcholine. Noradrenaline was competitive with respect to 3H]acetylcholine in this effect. Serotonin, noradrenaline, and dopamine inhibited binding of 3H]vesamicol to the vesicles, and dopamine was a competitive inhibitor of the binding of this allosteric ligand of the acetylcholine transporter. The results indicate that the acetylcholine transporter does not transport any other classical neurotransmitter, but serotonin, noradrenaline, and dopamine bind to the acetylcholine site.
Keywords:Biogenic amines  Synaptic vesicles  Active transport  Acetylcholine transporter  Vesamicol receptor              Torpedo
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