Molecular Human Reproduction Vol. 2, NUMBER 2 pp. 111-116, 1996
© European Society of Human Reproduction and Embryology 1996
research-article |
Regulation of the inducible form of prostaglandin endoperoxide synthase in the perfused rat ovary
1Department of Obstetrics and Gynecology, Göteborg University, Sahlgrenska Hospital S-413 45 Göteborg, Sweden 2Department Physiology, Göteborg University, Sahlgrenska Hospital S-413 45 Göteborg, Sweden 3Department of Physiology and Obstetrics and Gynecology, Umeå University Sweden
To whom correspondence should be addressed at: 4To whom correspondence should be addressed
The regulation of the two isoforms of prostaglandin endoperoxide synthase (PGS-1 and PGS-2) and prostaglandin synthesis by luteinizing hormone (LH)/3-isobutyl-1-methylxanthine (IBMX) and progesterone was examined in granulosa cells and residual ovarian tissue of rat ovaries perfused in vitro. The endogenous progesterone synthesis was blocked by an inhibitor of 3ß-dehydroxysteroid-dehydrogenase, compound A (CA), previously shown to reversibly inhibit ovulation in the in vitro perfused rat ovary. Preovulatory ovaries were perfused for 7 h, and soluble extracts from granulosa cells and residual ovarian tissue were obtained for immunoblotting and determination of the tissue contents of PGS-1/PGS-2. The tissue concentrations of prostaglandins (PGE2, PGF2
and 6-keto-PGF1) were measured. The ovaries were perfused with medium alone (control) or medium containing LH (0.1 µg/ml) and IBMX (0.2 mM), LH+IBMX+CA (10 µg/ml) or LH+IBMX+CA+progesterone (10 µg/ml). PGE2, PGF2 and 6-keto-PGF1 tissue concentrations were increased by LH+IBMX, with highest values detected for PGE2. The addition of CA alone or CA in combination with exogenous progesterone, did not change the values of prostaglandins increased by LH+IBMX. The content of PGS-1 was only marginally changed in both granulosa cells and residual ovarian tissue in the different treatment groups, compared to the control group. In contrast, PGS-2 was markedly increased by LH+IBMX, especially in the granulosa cells. The addition of CA, in combination with LH+IBMX, resulted in a small decrease of PGS-2, and progesterone further decreased its content. In the residual ovarian tissue, only minor changes of PGS-2 were detected. These results demonstrate that LH and progesterone selectively regulate the expression of PGS-2 in rat granulosa cells, whereas the hormonal regulation of PGS-1 is less pronounced. Progesterone inhibits PGS-2 in granulosa cells but has negligible effects on the total ovarian synthesis of prostaglandins during the ovulatory period.
ovulation/progesterone/prostaglandin endoperoxide synthase/prostaglandins/rat
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