Abstract— Tryptophan uptake was studied in brain slices and synaptosomes prepared from regions known to vary in the numbers of serotoninergic cell bodies and nerve endings that they contain. The rate of tryptophan uptake was highest in hypothalamus for both types of preparation. Differences among the regions were much more pronounced in isolated nerve endings (synaptosomes). Loading with tryptophan did not affect the uptake into tissue slices. Tryptophan accumulation in hypothalamus synaptosomes was reduced after intraventricular injection of 5,7–dihydroxytryptamine whereas no change was observed in synaptosomes prepared from cerebellum under the same conditions; accumulation by synaptosomes prepared from the hypothalamic and hippocampal regions was reduced after raphe lesions.
Journal of Neurochemistry – Wiley
Published: May 1, 1977
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