Abstract
Sodium-coupled neurotransmitter transporters, located in the plasma membrane of nerve terminals and glial processes, serve to keep the extracellular transmitter levels below those which are neurotoxic. Moreover, they help, in conjunction with diffusion, to terminate its action in synaptic transmission. Such a termination mechanism operates with most transmitters, including γ-aminobutyric acid (GABA), l-glutamate, glycine, dopamine, serotonin, and norepinephrine. Another termination mechanism is observed with cholinergic transmission. After dissociation from its receptor, acetylcholine is hydrolyzed into choline and acetate. The choline moiety is then recovered by sodium-dependent transport as described. Since the concentration of the transmitters in the nerve terminals is typically as much as four orders of multitude higher than in the cleft, energy input is required. The transporters that are located in the plasma membranes of nerve endings and glial cells obtain this energy by coupling the flow of neurotransmitters to that of sodium. The (Na+ + K+)-ATPase generates an inwardly-directed electrochemical sodium gradient that is utilized by the transporters to drive uphill transport of the neurotransmitters (reviewed in refs. 30–32). Neurotransmitter uptake systems have been investigated in detail by using plasma membranes obtained on osmotic shock of synaptosomes. It appears that these transporters are coupled not only to sodium, but also to additional ions like potassium or chloride (Table 1).
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Kanner, B.I. (1997). Sodium-Coupled GABA and Glutamate Transporters. In: Reith, M.E.A. (eds) Neurotransmitter Transporters. Contemporary Neuroscience. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-470-2_5
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