© 1992 Medical Council on Alcohol
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OCCURRENCE IN VIVO OF 5-HYDROXYTRYPTOPHOL IN THE BRAIN OF RATS TREATED WITH ETHANOL
Department of Legal Medicine, Kyoto Prefectural University of Medicine Kawaramachi, Kamigyo-Ku, Kyoto 602, Japan
Received 30 July 1991; accepted 14 January 1992
The effect of ethanol (EtOH) on the release of dopamine (DA) and 5-hydroxytryptamine (5-HT) and the efflux of their metabolites, 3, 4-dihydroxyphenylacetic acid (DOPAC), 5-hydroxyindol-3-ylacetic acid (5-HIAA) and 5-hydroxytryptophol (5-HTOL) from the striatum of the freely moving rat were studied in vivo using brain microdialysis. Striatal DA and 5-HT release was maximally enhanced at first fraction after the administration of EtOH (2 g/ kg, i.p.). The level of the DA-oxidized metabolite, DOPAC, decreased significantly. In the 5-HT metabolic pathway, the oxidized metabolite, 5-HIAA, did not show significant changes, whereas levels of the biogenic alcohol 5-HTOL were increased to 180% at 90 min following EtOH administration. It is suggested that EtOH, most probably via acetaldehyde, could shift 5-HT metabolism from the oxidative to the reductive pathway in the rat brain.
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