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Detection of the release of 5-hydroxyindole compounds in the hypothalamus and the n. raphe dorsalis throughout the sleep-waking cycle and during stressful situations in the rat: a polygraphic and voltammetric approach

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Summary

In the present work, voltammetric method combined with polygraphic recordings were used in animals under long-term chronic conditions; the extracellular concentrations of 5-hydroxyindole compounds (5-OHles) and in particular 5-hydroxyindoleacetic acid (5-HIAA) were measured in the hypothalamus and in the nucleus Raphe Dorsalis (n.RD). The hypothesis that extracellular detection of 5-HIAA, in animals under physiological conditions, might reflect serotonin (5-HT) release is suggested by the following observations: — serotoninergic neurons are reported to contain only monoamine oxidase type B (MAO-B); — an inhibitor of such an enzyme, MDL 72145 (1 mg/kg), fails to decrease the extracellular 5-HIAA peak 3 height; — MAO type A is contained in non-5-HT cells or neurons; — only the inhibitor of this last type of enzyme (Clorgyline 2.5 mg/kg) induces a complete disappearance of the voltammetric signal. The 5-HIAA measured in the extracellular space thus comes from the 5-HT released and metabolized outside the 5-HT neurons. Throughout the sleep-waking cycle, 5-OHles release occurs following two different modes: 1 — during sleep, in the vicinity of the 5-HT cellular bodies in the n.RD; this release might come from dendrites and be responsible for the 5-HT neuronal inhibition occurring during sleep; 2 — during waking, at the level of the axonal nerve endings impinging on the hypothalamus; this release might be related to the synthesis of “hypnogenic factors”. Finally, we have observed that in the hypothalamus, 30 min. of immobilization-stress (IS) induces a larger increase of the voltammetric signal (+ 80%) than a painful stimulation of the same duration (+ 30%); the possible link between the 5-OHles release occurring in this area during an IS and the subsequent paradoxical sleep rebound is discussed.

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Authors and Affiliations

  1. Département de Médecine Expérimentale, INSERM U52 — CNRS UA 1195, Université Cl. Bernard, 8 Avenue Rockefeller, F-69373, Lyon Cedex 08, France

    F. Houdouin, R. Cespuglio & M. Jouvet

  2. Laboratoire de Chimie Biologique INSERM U 205 — INSA, 20 Rue A. Einstein, F-69621, Villeurbanne, France

    A. Gharib & N. Sarda

Authors
  1. F. Houdouin
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  2. R. Cespuglio
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  3. A. Gharib
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  4. N. Sarda
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  5. M. Jouvet
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Houdouin, F., Cespuglio, R., Gharib, A. et al. Detection of the release of 5-hydroxyindole compounds in the hypothalamus and the n. raphe dorsalis throughout the sleep-waking cycle and during stressful situations in the rat: a polygraphic and voltammetric approach. Exp Brain Res 85, 153–162 (1991). https://doi.org/10.1007/BF00229997

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  • DOI: https://doi.org/10.1007/BF00229997

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