Abstract
A nonradiochemical in vitro assay using capillary electrophoresis with electrochemical detection at an enzyme-modified microelectrode has been developed to evaluate the inhibition of high-affinity choline transport in synaptosomes. Quantitative analysis of high-affinity choline transporter rates as a function of inhibitor and substrate concentrations allowed determination of the mode of inhibition for the quaternary ammonium-catechol-based inhibitors 3-[(trimethylammonio)methyl]catechol, N,N-dimethylepinephrine, and 6-hydroxy- N,N-dimethylepinephrine. The results are compared to the well-characterized inhibitor of choline transport, hemicholinium-3.
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