Unstimulated and Amphetamine-Stimulated Release of Endogenous Noradrenaline and Dopamine from Rat Brain In Vivo

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Abstract
The in vivo release rates of endogenous noradrenaline from the hypothalamus and dopamine from the caudate nucleus of the rat have been determined. Artificial CSF perfusates collected from a push-pull cannula inserted into specific areas of the brain were assayed for the amines by a sensitive radioenzymatic procedure. The release rates of noradrenaline and dopamine into artificial CSF perfusates were 38 ± 6 and 46 ± 6 pg/h (225 ± 36 and 301 ± 39 fmol/h), respectively; when 0.5 mM amphetamine was added to the CSF, the release rates of noradrenaline and dopamine increased to 176 ± 50 and 1183 ± 453 pg/h (1041 ± 296 and 7732 ± 2961 fmol/h), respectively.