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The release of dopamine was investigated in rat striatal slices exposed in vitro to neurotensin. This peptide increased basal and K+-evoked dopamine release. Moreover neurotensin antagonized the flunarizine-induced inhibition of K+-stimulated dopamine release. The K+-evoked 45Ca2+ accumulation was also inhibited by flunarizine. This effect was antagonized by neurotensin. The results suggest that dopamine release in rat striatum is regulated by different molecular events also of peptidergic nature having as possible mechanism of action an influence on calcium ion movements.
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