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Nitric oxide modulates human chorionic gonadotropin-induced ovulation in the rabbit
J S Hesla1, S Preutthipan, M P Maguire
1Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
Fertility and Sterility
|March 1, 1997
Summary
The L-arginine:nitric oxide pathway is crucial for ovulation. Inhibiting nitric oxide synthase with L-NAME significantly reduced ovulation rates in rabbits, highlighting NO
Area of Science:
- Reproductive biology
- Endocrinology
- Physiology
Background:
- Ovulation is triggered by human chorionic gonadotropin (hCG).
- The L-arginine:nitric oxide (NO) pathway's role in ovulation is not fully understood.
- NO synthase is present in rabbit ovaries.
Purpose of the Study:
- To investigate the role of the L-arginine:nitric oxide pathway in hCG-induced ovulation in rabbits.
- To determine if NO production is essential for ovulation.
Main Methods:
- Immunohistochemistry localized NO synthase in ovarian follicles and blood vessels.
- Rabbits received NG-nitro-L-arginine methyl ester (L-NAME), an NO synthase inhibitor, or its inactive enantiomer (D-NAME).
- Studies were conducted in vivo and in vitro using an isolated, perfused rabbit ovary model.
Main Results:
- NO synthase was localized to granulosa cells and ovarian vasculature.
- L-NAME administration significantly reduced ovulation rates in both in vivo and in vitro settings.
- The inactive D-NAME had no significant effect on ovulation rates.
Conclusions:
- Ovarian NO production is vital for ovulation.
- The L-arginine:nitric oxide pathway plays a significant role in the physiological processes of ovulation.