Back to Search
Start Over
Expression of progesterone receptor membrane component-2 within the immature rat ovary and its role in regulating mitosis and apoptosis of spontaneously immortalized granulosa cells.
- Source :
-
Biology of reproduction [Biol Reprod] 2014 Aug; Vol. 91 (2), pp. 36. Date of Electronic Publication: 2014 Jul 02. - Publication Year :
- 2014
-
Abstract
- Progesterone receptor membrane component 2 (Pgrmc2) mRNA was detected in the immature rat ovary. By 48 h after eCG, Pgrmc2 mRNA levels decreased by 40% and were maintained at 48 h post-hCG. Immunohistochemical studies detected PGRMC2 in oocytes and ovarian surface epithelial, interstitial, thecal, granulosa, and luteal cells. PGRMC2 was also present in spontaneously immortalized granulosa cells, localizing to the cytoplasm of interphase cells and apparently to the mitotic spindle of cells in metaphase. Interestingly, PGRMC2 levels appeared to decrease during the G1 stage of the cell cycle. Moreover, overexpression of PGRMC2 suppressed entry into the cell cycle, possibly by binding the p58 form of cyclin dependent kinase 11b. Conversely, Pgrmc2 small interfering RNA (siRNA) treatment increased the percentage of cells in G1 and M stage but did not increase the number of cells, which was likely due to an increase in apoptosis. Depleting PGRMC2 did not inhibit cellular (3)H-progesterone binding, but attenuated the ability of progesterone to suppress mitosis and apoptosis. Taken together these studies suggest that PGRMC2 affects granulosa cell mitosis by acting at two specific stages of the cell cycle. First, PGRMC2 regulates the progression from the G0 into the G1 stage of the cell cycle. Second, PGRMC2 appears to localize to the mitotic spindle, where it likely promotes the final stages of mitosis. Finally, siRNA knockdown studies indicate that PGRMC2 is required for progesterone to slow the rate of granulosa cell mitosis and apoptosis. These findings support a role for PGRMC2 in ovarian follicle development.<br /> (© 2014 by the Society for the Study of Reproduction, Inc.)
- Subjects :
- Animals
Cells, Cultured
Female
Granulosa Cells physiology
Membrane Proteins genetics
RNA, Messenger genetics
RNA, Messenger metabolism
Rats
Receptors, Progesterone genetics
Apoptosis physiology
Gene Expression Regulation physiology
Granulosa Cells cytology
Membrane Proteins metabolism
Mitosis physiology
Receptors, Progesterone metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1529-7268
- Volume :
- 91
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Biology of reproduction
- Publication Type :
- Academic Journal
- Accession number :
- 24990806
- Full Text :
- https://doi.org/10.1095/biolreprod.114.117481