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Acute central effects of 5,6-dihydroxytryptamine in fowl.

Authors
Type
Published Article
Journal
Archives internationales de pharmacodynamie et de therapie
Publication Date
Volume
222
Issue
2
Pages
267–271
Identifiers
PMID: 984979
Source
Medline

Abstract

In adult hens (Gallus domesticus) infusion into the IIIrd cerebral ventricle of 5,6-DHT (50, 75 and 100 mug) produced, after 5-10 min behavioural and electrocortical sedation and sleep lasting about 6-8 hr,and a monophasic or biphasic increase in body temperature for about 8 hr, Two and a half hr after 5,6-DHT administration, the histochemical picture showed a sustained decrease in yellow and green fluorescence in areas adjacent to the IIIrd ventricle, in the anterior hypothalamus and in the preoptic area, whereas no significant changes were detected in fluorescence of the tegmental cell-bodies. The present experiments suggest that behavioural and electrocortical effects evoked by 5,6-DHT seem to be due to a synergistic action of 5-HT and catecholamines displaced and released by this compound, whereas hyperthermic effects seem to be due to a more sustained release of 5-HT and/or to a direct action on 5-HT receptors and/or inhibition of 5-HT reuptake.

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