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Tryptamine transport in rat brain slices: A comparison with 5-hydroxytryptamine

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Abstract

The uptake of [14C]tryptamine (14C-T) and [3H]serotonin (3H-5HT) into slices of rat hypothalamus (HT), fronto-parietal cortex (CX), and caudate nucleus (Cau) has been investigated. In all three brain areas, the uptake of3H-5HT at 37°C was much greater than that in an ice-bath at 1.0–1.5°C. In contrast, the uptake of14C-T at 37°C was not much greater than uptake at 1.0–1.5°C. While markedly different amounts of3H-5HT were accumulated by each of the brain areas studied, the regional uptake of14C-T was quantitatively similar. In general the uptake of14C-T was inhibited less than3H-5HT by cocaine, DNP, ouabain, and decreased Na+ concentrations. Similarly,14C-T was less susceptible to serotonin uptake inhibitors except in the caudate. It was concluded that though a common indoleamine uptake system accumulates both T and 5HT, a non-specific low affinity or diffusional process also transports both amines and is predominantly responsible for T, but not 5HT, uptake. The spontaneous release, or wash-out, of14C-T from the caudate was much faster than that of3H-5HT. In addition, while depolarizing stimuli caused little or no release of14C-T, large releases of3H-5HT were observed. T, therefore, does not behave like a conventional neurotransmitter.

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  1. Psychiatric Research Division Saskatchewan Health Cancer and Medical Research Building, University of Saskatchewan, S7N OWO, Saskatoon, Saskatchewan, Canada

    Lillian E. Dyck

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Dyck, L.E. Tryptamine transport in rat brain slices: A comparison with 5-hydroxytryptamine. Neurochem Res 9, 617–628 (1984). https://doi.org/10.1007/BF00964508

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