Summary
In order to investigate the physiological importance of the membrane pump in eliminating released dopamine (DA) we have studied the effects of the putative selective dopamine re-uptake inhibitor, GBR 12909, on synthesis and metabolism of monoamines in the rat striatum, limbic forebrain, cortical hemispheres and substantia nigra (SN). The effects of the drug on the firing rate of catecholamine containing neurons in the SN and locus coerulus (LC) were also investigated. For comparison we have investigated the effects of desipramine and maprotiline. As a measure of the synthesis of noradrenaline (NA), DA and 5-hydroxytryptamine (5-HT) we determined the 3,4-dihydroxyphenylalanine (DOPA) and 5-hydroxytryptophan (5-HTP) accumulation after inhibition of aromatic l-amino acid decarboxylase by 3-hydroxy-benzylhydrazine (NSD 1015). As indirect measurements of DA and NA release in vivo, we have assessed pargyline-induced 3-methoxytyramine (3-MT) and normetanephrine (NM) accumulation and disappearance rates of DA and NA after inhibition of their synthesis by α-methyl-p-tyrosine (α-MT). Administration of GBR 12909 (2.5, 5, 10, 20 or 40 mg/kg) decreased the NSD 1015-induced DOPA accumulation in the striatum and in the limbic forebrain. In contrast, only minor effects of the drug were seen on the DOPA accumulation in the cortical hemisphere and on the cerebral 5-HTP accumulation. GBR 12909 increased the 3-MT accumulation in the striatum, limbic forebrain and the cortical hemispheres, an effect that was even more pronounced in haloperidol-pretreated animals. However, GBR 12909 did not alter the 3-MT accumulation in the SN either when given alone or when given to haloperidol-pretreated rats. In haloperidol-pretreated rats GBR 12909 markedly enhanced the DA disappearance in the striatum and in the limbic forebrain, but not in the SN. Furthermore, GBR 12909 did not significantly affect the firing rate of dopaminergic neurons in the SN or that of noradrenergic neurons in the LC. Taken together, our results support the notion that GBR 12909 is a specific DA uptake inhibitor without a transmitter releasing action. In addition, our findings indicate that DA re-uptake is of physiological importance in the elimination of DA from the synaptic cleft in the striatum, limbic forebrain and cortical hemispheres, but not in the SN. Furthermore, a large part of the DA taken up by the dopaminergic terminals in the striatum and in the limbic forebrain seems to be re-incorporated into the storage vesicles.
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Nissbrandt, H., Engberg, G. & Pileblad, E. The effects of GBR 12909, a dopamine re-uptake inhibitor, on monoaminergic neurotransmission in rat striatum, limbic forebrain, cortical hemispheres and substantia nigra. Naunyn-Schmiedeberg's Arch Pharmacol 344, 16–28 (1991). https://doi.org/10.1007/BF00167378
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DOI: https://doi.org/10.1007/BF00167378