Related Experiment Videos
RU-486 inhibits rat gonadal steroidogenesis
P E Sanchez1, M A Ryan, F Kridelka
1Developmental Endocrinology Branch, National Institute of Child Health and Human Development, Bethesda, Maryland.
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|July 1, 1989
Summary
RU-486, a synthetic steroid analogue, was found to inhibit both testicular and ovarian steroidogenesis in rats. This study investigated its effects on key gonadal steroidogenic enzymes.
Area of Science:
- Endocrinology
- Reproductive Biology
- Pharmacology
Background:
- RU-486 is a synthetic steroid analogue known to inhibit adrenal steroid synthesis.
- Its effects on gonadal steroidogenesis require further investigation.
Purpose of the Study:
- To assess the impact of RU-486 on rat testicular and ovarian steroidogenic enzyme activities.
- To determine if RU-486 affects gonadal steroidogenesis in rats.
Main Methods:
- Hypophysectomized rats received RU-486 or vehicle for seven days.
- Gonadal microsomal enzyme activities (testicular and ovarian) were measured.
- Enzymes assessed included 17-hydroxylase, aromatase, 17,20-desmolase, 3 beta-hydroxysteroid dehydrogenase, and 17-ketosteroid reductase.
Main Results:
- RU-486 significantly decreased testicular 17-hydroxylase and aromatase activity.
- Testicular 17,20-desmolase, 3 beta-hydroxysteroid dehydrogenase, and 17-ketosteroid reductase activities remained unaffected.
- Ovarian 17-hydroxylase activity decreased, while 3 beta-hydroxysteroid dehydrogenase activity was unchanged.
Conclusions:
- RU-486 inhibits steroidogenesis in both the rat testis and ovary.
- The drug selectively affects specific enzymes involved in gonadal steroid production.