Effects of Veratridine and Cocaine on the Kinetics of Synaptosomal Dopamine Release

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Abstract
Following preloading of striatal synaptosomes with 3H-dopamine (DA), the kinetics of release have been followed for a 60-min incubation period. DA appears to be totally releasable under both depolarizing (veratridine) and nondepolarizing conditions. Cocaine has no significant effect on release under either condition. Release is consistent with a model consisting of two parallel, linear compartments (when plotted as a log function). It is proposed that the slower compartment might represent the operation of the DA transporter, while the faster compartment might represent vesicular release.

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