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Oxidative stress and the ovary.
H R Behrman1, P H Kodaman, S L Preston
1Reproductive Biology Section, Department of Ob/Gyn, Yale University School of Medicine, New Haven, Connecticut 06520-8063, USA. harold.behrman@yale.edu
Journal of the Society for Gynecologic Investigation
|February 27, 2001
Summary
Reactive oxygen species, including superoxide and hydrogen peroxide, are produced during ovarian events like ovulation and corpus luteum regression in rats. This generation is linked to potential long-term ovarian pathology risks.
Area of Science:
- Reproductive biology
- Biochemistry
- Cellular physiology
Background:
- Reactive oxygen species (ROS) are implicated in ovarian physiological processes.
- Understanding ROS generation and its cellular sources in the ovary is crucial.
Purpose of the Study:
- To investigate the generation and role of ROS in rat ovarian regression and ovulation.
- To identify the cellular origins of ROS in these ovarian processes.
Main Methods:
- Analysis of superoxide, hydrogen peroxide, and lipid peroxides in luteal tissue.
- Assessment of ascorbic acid levels during luteal regression.
- Investigation of ROS effects on luteinizing hormone receptor function and steroidogenesis.
- Identification of cellular sources of ROS, focusing on leukocytes.
Main Results:
- ROS and lipid peroxides are generated during natural and prostaglandin-induced luteal regression, correlating with ascorbic acid depletion.
- ROS uncouple the luteinizing hormone receptor from adenylate cyclase and inhibit steroidogenesis.
- Leukocytes, particularly neutrophils, are the primary source of ROS in regressing corpora lutea and at ovulation.
- Antioxidants inhibit oocyte meiosis resumption, while ROS induce oocyte maturation.
Conclusions:
- ROS play dual roles in the ovary, with potential physiological functions and risks.
- Cyclic ROS production over time may increase cumulative risk for ovarian pathology, especially with reduced antioxidant status.