213 66 66 1 1 Michel Martinet Pierre Fonlupt Henri Pacheco Service de Chimie biologique Bat 406 Institut National des Sciences Appliquées 20 Avenue Albert Einstein F-69621 Villeurbanne Cedex France Abstract The kinetics of synaptosomal tryptophan accumulation has been determined in five regions of the rat brain. For tryptophan concentrations ranging from 2.5–20 μM, we found an active uptake in all the structures studied, i.e.: Corpus striatum, midbrain, brainstem, hypothalamus and cerebral cortex + hippocampus. The Vm of tryptophan uptake was highest in the cortex, followed in descending order by corpus striatum, hypothalamus, midbrain and brainstem, while the Km was highest in the cortex, then in descending order corpus striatum, brainstem, midbrain and hypothalamus. In spite of the possible nonspecific high affinity tryptophan uptake into serotoninergic neurons, we found a correlation between the Vm of tryptophan uptake and the different results in the literature concerning uptake and release of serotonin. These observations might indicate a correlation between the Vm of tryptophan uptake and the functional activity of serotonergic neurons.
Psychopharmacology – Springer Journals
Published: Nov 1, 1979
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