Regular Article
The Ovarian Renin–Angiotensin System in Reproductive Physiology,☆☆

https://doi.org/10.1006/frne.1997.0152Get rights and content

Abstract

The identification of the presence of prorenin, renin, angiotensinogen, angiotensin-converting enzyme, angiotensin II (Ang II), and Ang II receptors in the ovary suggests that there is a functional ovarian renin–angiotensin system (RAS). It could play a significant role in such areas of ovarian physiology as follicular development, steroidogenesis, oocyte maturation, ovulation, and follicle atresia. Expression of the ovarian RAS is regulated by gonadotropins. Ang II, a bioactive octapeptide of RAS, has important effects as a paracrine/autocrine regulator at different stages of the reproductive cycle. Ang II modulates ovarian steroidogenesis and formation of the corpus luteum and also stimulates oocyte maturation and ovulation via Ang II receptors on granulosa cells. In addition, increasing evidence demonstrates that Ang II is a major factor in regulating the function of atretic follicles. In any physiologic system, aberrations result in the development of pathologic states. Disturbances in the ovarian RAS can be the cause or the result of such reproductive disorders as polycystic ovary syndrome, ovarian hyperstimulation syndrome, ovarian tumors, and ectopic pregnancy. Data support the concept of an active and regulated RAS in ovarian follicles. Species differences observed in the expression of ovarian RAS suggest varying functional roles among species with respect to ovarian physiology.

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    Address correspondence and reprint requests to Yasunori Yoshimura, Department of Obstetrics and Gynecology, Keio University School of Medicine, Shinanomachi 35, Shinjuku-ku, Tokyo, Japan 160. Telephone: 3-3353-1211; Fax: 3-3352-1598; e-mail: http://[email protected].

    ☆☆

    J, H, LaraghB, M, Brenner, Eds.

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