Effects of short-term stimulation of serotoninergic pathways on the pulsatile secretion of luteinizing hormone in the absence and presence of acute opiate-receptor blockage

Randall Urban, J. D. Veldhuis

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

To investigate the role of the serotoninergic system in regulating pulsatile gonadotropin secretion in man, we tested the influences of a novel selective serotonin reuptake inhibitor (fluoxetine HCl) on episodic LH release in men. Spontaneous LH pulsatility was assessed by computerized analysis of serial LH concentrations measured in blood samples withdrawn at 10 min intervals for 24 h. Possible alterations in pituitary responsiveness were tested by administering three consecutive two-hourly intravenous pulses of GnRH (10 μg, 10 μg, and 100 μg). The effects of fluoxetine (20 mg orally three times daily for one wk) were assessed in a double-blind, placebo-controlled design. Compared with the placebo, fluoxetine elicited no changes in 24 h mean serum LH concentrations, LH pulse characteristics (Cluster analysis), or LH secretion and clearance parameters assessed in response to exogenous GnRH administration (deconvolution analysis) in the presence of normal opiatergic tone (nine healthy young men), and during acute blockade of the opiatergic system (seven young men treated with the mu-opiate receptor antagonist, naltrexone). In summary, a selective enhancer of serotoninergic activity (fluoxetine HCl) does not affect pulsatile LH release basally or in the presence of acute inhibitory opiatergic tone. Since this probe does modify prolactin secretion in man, we conclude that stimulation of the serotoninergic system by this selective neuroendocrine probe shows no demonstrable coupling between the serotoninergic and the opiatergic pathways that modulate pulsatile LH release in man.

Original languageEnglish (US)
Pages (from-to)227-232
Number of pages6
JournalJournal of Andrology
Volume11
Issue number3
StatePublished - 1990
Externally publishedYes

Fingerprint

Opioid Receptors
Luteinizing Hormone
Fluoxetine
Gonadotropin-Releasing Hormone
Placebos
Neurosecretory Systems
Naltrexone
mu Opioid Receptor
Serotonin Uptake Inhibitors
Gonadotropins
Prolactin
Cluster Analysis
Serum

Keywords

  • fluoxetine HCl
  • opiate
  • pulsatile gonadotropin secretion
  • serotonin

ASJC Scopus subject areas

  • Endocrinology

Cite this

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title = "Effects of short-term stimulation of serotoninergic pathways on the pulsatile secretion of luteinizing hormone in the absence and presence of acute opiate-receptor blockage",
abstract = "To investigate the role of the serotoninergic system in regulating pulsatile gonadotropin secretion in man, we tested the influences of a novel selective serotonin reuptake inhibitor (fluoxetine HCl) on episodic LH release in men. Spontaneous LH pulsatility was assessed by computerized analysis of serial LH concentrations measured in blood samples withdrawn at 10 min intervals for 24 h. Possible alterations in pituitary responsiveness were tested by administering three consecutive two-hourly intravenous pulses of GnRH (10 μg, 10 μg, and 100 μg). The effects of fluoxetine (20 mg orally three times daily for one wk) were assessed in a double-blind, placebo-controlled design. Compared with the placebo, fluoxetine elicited no changes in 24 h mean serum LH concentrations, LH pulse characteristics (Cluster analysis), or LH secretion and clearance parameters assessed in response to exogenous GnRH administration (deconvolution analysis) in the presence of normal opiatergic tone (nine healthy young men), and during acute blockade of the opiatergic system (seven young men treated with the mu-opiate receptor antagonist, naltrexone). In summary, a selective enhancer of serotoninergic activity (fluoxetine HCl) does not affect pulsatile LH release basally or in the presence of acute inhibitory opiatergic tone. Since this probe does modify prolactin secretion in man, we conclude that stimulation of the serotoninergic system by this selective neuroendocrine probe shows no demonstrable coupling between the serotoninergic and the opiatergic pathways that modulate pulsatile LH release in man.",
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AU - Urban, Randall

AU - Veldhuis, J. D.

PY - 1990

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N2 - To investigate the role of the serotoninergic system in regulating pulsatile gonadotropin secretion in man, we tested the influences of a novel selective serotonin reuptake inhibitor (fluoxetine HCl) on episodic LH release in men. Spontaneous LH pulsatility was assessed by computerized analysis of serial LH concentrations measured in blood samples withdrawn at 10 min intervals for 24 h. Possible alterations in pituitary responsiveness were tested by administering three consecutive two-hourly intravenous pulses of GnRH (10 μg, 10 μg, and 100 μg). The effects of fluoxetine (20 mg orally three times daily for one wk) were assessed in a double-blind, placebo-controlled design. Compared with the placebo, fluoxetine elicited no changes in 24 h mean serum LH concentrations, LH pulse characteristics (Cluster analysis), or LH secretion and clearance parameters assessed in response to exogenous GnRH administration (deconvolution analysis) in the presence of normal opiatergic tone (nine healthy young men), and during acute blockade of the opiatergic system (seven young men treated with the mu-opiate receptor antagonist, naltrexone). In summary, a selective enhancer of serotoninergic activity (fluoxetine HCl) does not affect pulsatile LH release basally or in the presence of acute inhibitory opiatergic tone. Since this probe does modify prolactin secretion in man, we conclude that stimulation of the serotoninergic system by this selective neuroendocrine probe shows no demonstrable coupling between the serotoninergic and the opiatergic pathways that modulate pulsatile LH release in man.

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