Related Experiment Videos
Hormonal control of progesterone receptors
Annals of the New York Academy of Sciences
|March 11, 1977
Summary
Hormone levels regulate uterine progesterone receptors. Estrogen increases receptor levels, while progesterone decreases them, influencing reproductive cycles and pregnancy. This study details these dynamic changes.
Area of Science:
- Reproductive Endocrinology
- Molecular Biology
- Gynecology
Background:
- Uterine progesterone receptors are crucial for reproductive functions.
- Their concentration is influenced by both estrogen and progesterone.
Purpose of the Study:
- To investigate the hormonal control of uterine progesterone receptors.
- To elucidate receptor variations during the estrous cycle and pregnancy.
Main Methods:
- Hormonal assays and receptor concentration measurements (cytosol and nuclear).
- Autoradiographic studies to localize receptor distribution.
- Analysis of receptor dynamics during the estrous cycle and rat pregnancy.
Main Results:
- Estrogen upregulates progesterone receptors; progesterone downregulates them.
- Receptor levels peak pre-ovulation and decrease post-ovulation during the estrous cycle.
- Progesterone receptor concentration changes significantly during pregnancy, increasing towards term.
Conclusions:
- Hormonal regulation of progesterone receptors explains cyclical variations.
- Receptor dynamics during pregnancy suggest a role in maintaining gestation.
- Consistent regulation across uterine tissues indicates shared control mechanisms.