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Secretion pattern of immunoreactive inhibin in men
W Brennemann1, L Sommer, B Stoffel-Wagner
1Institut für Klinische Biochemie, Universität Bonn, Germany.
European Journal of Endocrinology
|September 1, 1994
Summary
Healthy men exhibit a clear diurnal rhythm in serum inhibin concentrations, mirroring testosterone levels. This study reveals daily fluctuations in inhibin secretion, with peaks in the morning and troughs at night.
Area of Science:
- Endocrinology
- Reproductive Biology
Background:
- Inhibin, a gonadal glycoprotein hormone, plays a crucial role in regulating reproductive functions.
- Understanding the secretion patterns of inhibin is essential for comprehending male reproductive physiology.
Purpose of the Study:
- To investigate the chronological changes and diurnal variations in serum inhibin concentrations in healthy adult males.
- To compare the secretion profiles of inhibin with luteinizing hormone (LH), follicle-stimulating hormone (FSH), and testosterone.
Main Methods:
- Blood samples were collected every 15 minutes for 24 hours from healthy male volunteers (aged 24-27).
- Serum inhibin was measured using a two-site immunoenzymatic assay.
- Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) were quantified by immunoradiometric assay, and testosterone by radioimmunoassay.
- Cosinor rhythmometry was employed to analyze diurnal variations.
Main Results:
- Serum inhibin concentrations displayed a clear circadian rhythm, with highest levels observed in the morning (08:00 h) and lowest levels during the night (01:00-02:00 h).
- Testosterone levels also exhibited a diurnal pattern, with morning peaks and nighttime troughs.
- Cluster pulse analysis identified four to seven inhibin pulses per day per individual.
Conclusions:
- Healthy adult males demonstrate a distinct diurnal secretion pattern for inhibin, synchronized with testosterone secretion.
- These findings contribute to the understanding of the dynamic regulation of the male reproductive endocrine system.