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A model for follicular selection and ovulation: lessons from superovulation.
1Department of Obstetrics and Gynaecology, University of Edinburgh, Scotland.
Journal of Steroid Biochemistry
|January 1, 1987
Summary
The ovarian cycle selects a dominant follicle by regulating follicle-stimulating hormone (FSH). This selection process ensures only one follicle matures, but can be altered to achieve multiple ovulations.
Area of Science:
- Reproductive Endocrinology
- Gynecology
- Developmental Biology
Background:
- The normal ovarian cycle involves the selection of a single preovulatory follicle.
- Follicle development is regulated by hormonal fluctuations, primarily FSH, estradiol, and inhibin.
Purpose of the Study:
- To propose a model for the selection of the dominant preovulatory follicle.
- To explain the hormonal mechanisms governing follicle selection and development.
- To explore factors influencing multiple ovulation.
Main Methods:
- The study proposes a theoretical model based on existing scientific evidence and observations.
- It analyzes the roles of follicle-stimulating hormone (FSH), estradiol, and inhibin in folliculogenesis.
- It considers the impact of external factors like clomiphene and gonadotropins.
Main Results:
- FSH activates a single small follicle, which then suppresses FSH and inhibin to inhibit other follicles.
- The dominant follicle becomes increasingly sensitive to FSH, ensuring its continued development.
- Multiple ovulation can occur if the FSH threshold period is extended, though synchrony is not achieved.
Conclusions:
- Dominant follicle selection requires a specific early follicular phase hormonal environment.
- Follicle selection is largely a chance event, dependent on timing and hormonal milieu.
- The corpus luteum inhibits further folliculogenesis by suppressing FSH and LH.