Abstract
Pretreatment of rats with intraventricular 6-hydroxydopamine produced considerable destruction of noradrenergic and dopaminergic nerve terminals as indicated by depletions in synaptosomal catecholamine contents. However, 6-hydroxydopamine pretreatment did not result in diminished release of ATP during depolarization of synaptosomes with either elevated extracellular K + or veratridine. These findings suggest that most of the ATP released during the depolarization of rat brain synaptosomal preparations is not co-released with noradrenaline or dopamine but must originate from other sources.
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