Abstract
AXELROD1 found that released noradrenaline is recaptured by presynaptic nerve terminals, and proposed reuptake as a mechanism for rapid neurotransmitter inactivation. Subsequent studies led to the identification of high and low-affinity components in the uptake of several putative neurotransmitters by nerve terminals2–7. Although the apparent Km values reported for the high-affinity uptake of some neurotransmitters (notably amino acids) are comparable to those reported for the low-affinity uptake of other neurotransmitters, it is generally thought that the inactivation of most neurotransmitter amino acids is obtained through high-affinity uptake systems having a Km of the order of 10−5 M. Indeed, the existence of a high-affinity uptake for a given substance is often considered to favour its being a neurotransmitter.
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LEVI, G., RAITERI, M. Exchange of neurotransmitter amino acid at nerve endings can simulate high affinity uptake. Nature 250, 735–737 (1974). https://doi.org/10.1038/250735a0
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DOI: https://doi.org/10.1038/250735a0
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