Effect of 5,7-dihydroxytryptamine on serotonergic control of prolactin secretion and behavior in rats.

Published

Journal Article

The intracisternal administration of 5,7-dihydroxytryptamine (5,7-DHT) to rats resulted in a potentiated response to 5-hydroxytryptophan (5-HTP) when the animals were tested 30 days later. The 5-HTP-induced changes include elevation of serum prolactin, decrease in operant responding, and the magnitude of the "serotonin behavioral syndrome" observed after 5-HTP administration. The serotonin concentration in brains of 5,7-DHT-treated animals reached maximum earlier and remained elevated longer than that of controls following administration of 5-HTP. Brain norepinephrine and dopamine concentration were not affected by 5-HTP in either group of animals. The increase in serum prolactin concentration elicited by administration of the serotonergic agonists quipazine or 5-methoxy-N,N-dimethyltryptamine and by the serotonin uptake inhibitor fenfluramine also was potentiated by pretreating rats with 5,7-DHT. These data suggest that both serotonergic receptor supersensitivity and the absence of presynaptic uptake sites contribute to the enhanced responses to 5-HTP occurring in rats previously treated with 5,7-DHT. The findings further demonstrate that both behavioral and hormonal measures can be used to assess the sensitivity of serotonergic receptors and indicate that 5,7-DHT may be useful in evaluating the role of serotonergic neurons in neuroendocrine function.

Full Text

Duke Authors

Cited Authors

  • Kuhn, CM; Vogel, RA; Mailman, RB; Mueller, RA; Schanberg, SM; Breese, GR

Published Date

  • 1981

Published In

Volume / Issue

  • 73 / 2

Start / End Page

  • 188 - 193

PubMed ID

  • 6785814

Pubmed Central ID

  • 6785814

International Standard Serial Number (ISSN)

  • 0033-3158

Language

  • eng

Conference Location

  • Germany