Serotonin1A receptor activation by flesinoxan in humans. Body temperature and neuroendocrine responses

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
B SelettiC de Montigny

Abstract

The effects of the selective 5-HT1A receptor agonist flesinoxan on neuroendocrine function, temperature, and behavior were assessed in male healthy volunteers using a double-blind, placebo-controlled crossover design. Flesinoxan (7 and 14 micrograms/kg), administered intravenously in 11 healthy volunteers, elicited a dose-related decrease in body temperature and increases in growth hormone, adrenocorticotropic hormone (ACTH), cortisol, and prolactin plasma levels. In a second independent study, 12 healthy volunteers were pretreated sequentially, at one-week intervals, with either the 5-HT1A antagonist pindolol (30 mg, PO), the nonselective 5-HT1/2 antagonist methysergide (4 mg, PO), or placebo, prior to being administered flesinoxan (1 mg, IV). The growth hormone response to flesinoxan was blocked by pindolol but not by methysergide, whereas the prolactin response was blocked by methysergide but not by pindolol. The ACTH and cortisol responses to flesinoxan were potentiated by methysergide. The flesinoxan-induced hypothermia was attenuated by both methysergide and pindolol, although the latter effects did not reach statistical significance. The present results suggest that the growth hormone response and the hypothermic respons...Continue Reading

Citations

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