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Background Monoamine transporters such as the dopamine transporter (DAT) and the serotonin transporter (SERT) mediate the reuptake of previously released monoamines dopamine (DA) and serotonin from the synaptic cleft; thereby, these transporters regulate the monoamine content available for synaptic transmission. Certain stimuli, such as changes in ionic composition of the extracellular fluid or psychostimulants (e.g. amphetamines) are able to induce outward transport and thus increase extracellular monoamine concentrations. Influx and efflux of substrate are thought to be asymmetrical processes regulated by intracellular kinases. It has been demonstrated that removal of N-terminal serines ablates amphetamine-induced reverse transport in the DAT. Furthermore, the Ca/calmodulin-dependent protein kinase II a (aCaMKII) can bind to the DAT C-terminus and phosphorylate N-terminal serines. Pharmacological inhibition of aCaMKII dramatically reduces amphetamine-induced efflux both in cells stably transfected with the human DAT as well as in rat striatal slices. Here, we test whether aCaMKII-regulation of amphetamineinduced reverse transport of monoamines is affected in mice with mutations in the aCaMKII gene.

Calmodulin kinase II regulates amphetamine-induced reverse transport in dopamine and serotonin transporters