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Progesterone and cell-cell adhesion interact to regulate rat granulosa cell apoptosis
1Department of Obstetrics and Gynecology, University of Connecticut Health Center, Farmington 06030, USA.
Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|November 1, 1994
Summary
Progesterone inhibits large granulosa cell apoptosis, and this effect is enhanced by cell-cell contact through gap junctions. Progesterone receptor is key for this anti-apoptotic action in ovarian follicles.
Area of Science:
- Reproductive Biology
- Cell Biology
- Endocrinology
Background:
- Ovarian follicles contain small and large granulosa cells, with large cells undergoing apoptosis in culture.
- Understanding factors influencing granulosa cell apoptosis is crucial for reproductive health.
Purpose of the Study:
- To investigate the interplay between cell-cell contact, progesterone, and apoptosis in large granulosa cells.
- To determine if progesterone receptor mediates the anti-apoptotic effects of progesterone.
Main Methods:
- Isolation of large granulosa cells from immature rat ovaries.
- Culture of single and aggregated granulosa cells with progesterone and/or RU 486 (progesterone antagonist).
- Assessment of apoptosis using electron microscopy and DNA fragmentation assays.
Main Results:
- Aggregated granulosa cells exhibited twofold lower apoptosis rates compared to single cells, linked to gap junction formation.
- Progesterone reduced apoptosis, while RU 486 increased it, in both single and aggregated cells.
- Progesterone's anti-apoptotic effect was significantly more potent in aggregated cells, especially in the presence of RU 486.
Conclusions:
- Progesterone inhibits granulosa cell apoptosis via the progesterone receptor.
- Cell-cell adhesion, facilitated by gap junctions, potentiates the anti-apoptotic actions of progesterone in ovarian follicles.