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. 1980 Oct;307:259–272. doi: 10.1113/jphysiol.1980.sp013434

Fast axonal transport of foreign transmitters in an identified serotonergic neurone of Aplysia californica.

D J Goldberg, J H Schwartz
PMCID: PMC1283044  PMID: 6162949

Abstract

1. Radioactively labelled compounds, several of which are neurotransmitters, were injected with pressure into the soma of the serotonergic giant cerebral neurone (g.c.n.) of Aplysia californica. The compounds injected were [3H]dopamine, [3H]DL-octopamine, [3H]histamine, [3H]gamma-aminobutyric acid and [3H]choline. 2. Substantial amounts of radioactivity appeared in the axons of the g.c.n. with all of the injected compounds. Except for [3H]choline, the amounts were similar to the amount appearing when [3H]serotonin is injected. 3. The biogenic amines, [3H]dopamine, DL-[3H]octopamine and [3H]histamine, all moved in the axon at velocities similar to that of [3H]serotonin. In contrast, the radioactivity in axons of cells injected with [3H]gamma-aminobutyric acid and [3H]choline moved much more slowly. In addition, the shapes of the spatial distributions of radioactivity in the axons of cells injected with the biogenic amines resembled that obtained when [3H]serotonin is injected. This distribution is characteristic of fast axonal transport. The spatial distributions of radioactivity in the axons of cells injected with [3H]gamma-aminobutyric acid and [3H]choline were markedly different. We thus conclude that [3H]dopamine, DL-[3H]octopamine and [3H]histamine move by fast axonal transport, whereas the radioactivity in the axons of cells injected with [3H]gamma-aminobutyric acid and [3H]choline does not. 4. Injection of large amounts of dopamine and octopamine reduced the export into the axon of [3H]serotonin injected into the same cell. Large amounts of choline did not reduce export of [3H]serotonin. We conclude that the biogenic amines compete with serotonin for the vesicular storage site and that they move by fast transport because they are sequestered by the serotonergic storage vesicle. 5. The specificity of uptake into the storage vesicle as assayed with this in vivo system is similar to the specificity of uptake into aminergic vesicles as previously studied in vitro.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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