5-hydroxyoxindole, an indole metabolite, is present at high concentrations in brain

Autor: Marie-Claude Tournaire, Benoît Malpaux, Jean-Claude Thiéry, Michèle Crumeyrolle-Arias, Sylvie Rabot
Přispěvatelé: Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Neurobiologie et Psychiatrie, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Unité de recherche d'Écologie et Physiologie du Système Digestif (UEPSD), Institut National de la Recherche Agronomique (INRA), Physiologie de la reproduction et des comportements [Nouzilly] (PRC), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur]-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Tours (UT)-Institut Français du Cheval et de l'Equitation [Saumur] (IFCE)-Institut National de la Recherche Agronomique (INRA), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur]-Université de Tours-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation [Saumur] (IFCE)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), ProdInra, Migration
Jazyk: angličtina
Rok vydání: 2008
Předmět:
Zdroj: Journal of Neuroscience Research
Journal of Neuroscience Research, Wiley, 2008, 86 (1), pp.202-207. ⟨10.1002/jnr.21475⟩
Journal of Neuroscience Research, 2008, 86 (1), pp.202-207. ⟨10.1002/jnr.21475⟩
ISSN: 0360-4012
1097-4547
Popis: International audience; 5-Hydroxyoxindole has been identified as a urinary metabolite of indole, which is produced from tryptophane via the tryptophanase activity of gut bacteria. We have demonstrated recently that 5-hydroxyoxindole is an endogenous compound in blood and tissues of mammals, including humans. To date, 5-hydroxyoxindole's role is unknown. The aim of this study was to compare 5-hydroxyoxindole levels in plasma and cerebrospinal fluid (CSF) during day-night and seasonal changes, as a common approach to pilot physiological characterization of any compound. Simultaneous blood and CSF sampling was performed in the ewe, because its size allows collection in quantities suitable for 5hydroxyoxindole assay (HPLC-ED) in awake animals, without obvious physiological or behavioral disturbance. 5-Hydroxyoxindole concentration was quite stable in plasma (2-6 nM range), whereas, in CSF, it displayed marked day-night and photoperiodic variations (4-116 nM range). 5-Hydroxyoxindole levels in CSF were twofold higher at night than during the day and at least one order of magnitude higher during the long compared with the short photoperiod. These day/night and photoperiodic variations persisted after pinealectomy, indicating that 5-hydroxyoxindole rhythms in CSF are independent of melatonin formation. In conclusion, high levels of 5-hydroxyoxindole in the CSF during long photoperiod and its daily modulation suggest physiological involvement of 5-hydroxyoxindole in rhythmic adjustments in the brain, independently of the pineal gland.
Databáze: OpenAIRE
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