Modulation of the endogenous acetylcholine release from rat striatal slices.

The dopaminergic modulation of the acetylcholine release from rat striatal slices has been investigated using a chemiluminescent method. Dopamine, more efficiently than apomorphine, decreased the potassium-evoked release of acetylcholine. The effect of dopamine antagonists, haloperidol and sulpiride, has been studied, and haloperidol was a better antagonist than sulpiride to the dopamine effect. Haloperidol elicited an acetylcholine release from striatal slices at 0.1 nM, probably by removing endogenous dopamine from dopaminergic receptors.