Barrier mechanisms for neurotransmitter monoamines in the choroid plexus
- 1 March 1980
- journal article
- research article
- Published by Wiley in Acta Physiologica Scandinavica
- Vol. 108 (3), 215-221
- https://doi.org/10.1111/j.1748-1716.1980.tb06525.x
Abstract
Studies were performed on choroid plexuses from mouse and rat. The plexus tissue, sympathectomized to avoid interference from adrenergic nerves, is able to accumulate L-dopa as well as [norepinephrine and 5-hydroxytryptamine] against a concentration gradient. Within the plexus tissue these compounds are metabolized by aromatic L-amino acid decarboxylase, monoamine oxidase and carboxy-O-methyl transferase, whose activities were determined radiometrically. On the basis of this and the fate of systemically administered L-dopa and dopamine studied by fluorescence histochemistry it is suggested that the epithelium of the choroid plexus provides not only a structural but also an enzymatic barrier for transmitter amines. The enzymatic barrier for amine precursors is considerably less sufficient at this blood-CSF interphase. The trapping of monoamines resembles the enzymatic barrier present in the endothelial cells and pericytes at the microvascular level of the blood-brain interphase.Keywords
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