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Androgen level in the sheep fetus during gestation
Summary
Fetal lamb studies reveal decreasing testicular testosterone and dihydrotestosterone near term. Nongonadal testosterone production may increase during fetal development, with the fetal testis contributing less to plasma testosterone over gestation.
Area of Science:
- Reproductive biology
- Endocrinology
- Developmental physiology
Background:
- Understanding fetal gonadal function is crucial for reproductive health.
- Androgen levels play a key role in sexual development and differentiation.
- Previous research has indicated varying androgen profiles during gestation.
Purpose of the Study:
- To investigate the ontogeny of gonadal function in fetal lambs.
- To quantify androgen content in amniotic fluid, plasma, and gonads.
- To elucidate the contribution of fetal testes to plasma testosterone levels.
Main Methods:
- Radioimmunoassay was used to determine androgen concentrations.
- Samples were collected from 107 fetal lambs across different gestational stages.
- Analysis included amniotic fluid, plasma, and gonadal tissues.
Main Results:
- Testosterone was undetectable in amniotic fluid from fetuses of either sex.
- Ovaries showed no testosterone activity throughout gestation.
- Testicular testosterone and 5alpha-dihydrotestosterone concentrations decreased near term.
Conclusions:
- Nongonadal testosterone production likely increases during fetal development.
- The fetal testis may contribute progressively less to the plasma testosterone pool as gestation advances.
- These findings offer insights into the complex regulation of fetal androgen dynamics.