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5 alpha-reduced androgens in the human fetal testis
The Journal of Clinical Endocrinology and Metabolism
|March 1, 1987
Summary
Androgen levels, including testosterone and its derivatives, were measured in fetal testes and ovaries. Testes contained significant androgens, while ovaries had minimal levels, suggesting distinct roles in early development.
Area of Science:
- Reproductive biology
- Developmental endocrinology
- Steroidogenesis
Background:
- Androgens are crucial hormones regulating sexual development.
- Understanding fetal androgen production is key to comprehending gonadal differentiation.
- Previous research has focused on postnatal androgen effects, with less known about fetal stages.
Purpose of the Study:
- To quantify androgen levels in human fetal testes and ovaries.
- To investigate the presence and relative amounts of key androgens during early development.
- To explore potential sex-specific differences in androgenic environments within developing gonads.
Main Methods:
- Analysis of androgen content in testicular and ovarian tissue samples from human embryos.
- Age range of embryos: less than 12 to approximately 20 weeks gestation.
- Measurement of testosterone, androstenedione, dihydrotestosterone, and 3 alpha-androstanediol.
Main Results:
- Testes exhibited detectable levels of testosterone and 5 alpha-reduced androgens (dihydrotestosterone, 3 alpha-androstanediol).
- Dihydrotestosterone and 3 alpha-androstanediol were present at approximately 1/30th the level of testosterone in testes.
- Ovarian tissues showed negligible amounts of testosterone, androstenedione, or the 5 alpha-reduced androgens.
Conclusions:
- Fetal testes possess a distinct androgenic environment compared to fetal ovaries.
- The presence of 5 alpha-reduced androgens in developing testes warrants further investigation.
- The specific role of dihydrotestosterone in testicular development remains an open question.