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Leydig cell responsiveness to single and repeated human chorionic gonadotropin administration
The Journal of Clinical Endocrinology and Metabolism
|July 1, 1979
Summary
A single injection of human chorionic gonadotropin (hCG) effectively boosts testosterone in men and boys for up to 120 hours. Repeated hCG doses within 48 hours do not provide additional Leydig cell stimulation.
Area of Science:
- Endocrinology
- Reproductive Medicine
Background:
- Testosterone is crucial for male development and function.
- Human chorionic gonadotropin (hCG) stimulates testosterone production in Leydig cells.
Purpose of the Study:
- To evaluate the impact of single and repeated hCG injections on plasma testosterone levels.
- To determine if repeated hCG administration enhances testosterone response.
Main Methods:
- Administered a single intramuscular injection of 1500 IU hCG to normal men, patients with isolated gonadotropin deficiency, and boys with delayed puberty.
- Administered repeated daily injections of 1500 IU hCG for 3 days to the same subjects.
- Measured plasma testosterone levels at various time points.
Main Results:
- A single hCG injection significantly increased testosterone levels for 96-120 hours, peaking at 72 hours.
- Repeated daily hCG injections resulted in similar testosterone levels compared to a single dose.
- No significant difference in testosterone levels at 24 and 48 hours between single and repeated dose regimens.
Conclusions:
- Single hCG injections provide a sustained increase in testosterone.
- Repeated hCG injections within 48 hours do not offer additional Leydig cell stimulation.
- hCG administration protocols may be optimized based on these findings.