Related Experiment Videos
Prolactinomas, testosterone-binding globulin, and androgen metabolism
The Journal of Clinical Endocrinology and Metabolism
|February 1, 1982
Summary
Prolactin (PRL) influences androgen metabolism by decreasing testosterone-estradiol-binding globulin (TeBG) levels in patients with prolactinoma. This leads to altered free testosterone fractions and metabolic clearance rates.
Area of Science:
- Endocrinology
- Reproductive Medicine
- Hormone Metabolism
Background:
- Prolactin (PRL) is a hormone with diverse physiological roles.
- The influence of PRL on androgen metabolism is not fully understood.
- Testosterone-estradiol-binding globulin (TeBG) plays a crucial role in regulating androgen bioavailability.
Purpose of the Study:
- To investigate the mechanism by which prolactin (PRL) affects androgen metabolism.
- To determine the impact of prolactinoma on testosterone-binding globulin (TeBG) capacity and free testosterone levels.
Main Methods:
- Assessed TeBG binding capacity and free testosterone fraction in patients with prolactinoma.
- Compared hormonal levels in untreated prolactinoma patients with reference values.
- Analyzed the metabolic clearance rates (MCRs) of testosterone and other androgens.
Main Results:
- Untreated prolactinoma patients exhibited decreased TeBG capacity and an increased free testosterone fraction.
- In males with prolactinoma, plasma free testosterone concentration decreased, while in females, apparent free testosterone concentration increased.
- Increased free testosterone fraction led to elevated MCRs for testosterone and 5 alpha-androstan-17 beta-ol-3-one.
Conclusions:
- Prolactin (PRL), in the context of prolactinoma, influences TeBG levels.
- PRL is identified as a potential factor affecting androgen metabolism, alongside known regulators like estrogens, androgens, and thyroid hormones.