Endocrinological and histological aspects of the process of polycystic ovary formation in the rat treated with testosterone propionate.

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  • OTA HIROTAKA
    Department of Obstetrics and Gynecology, Akita University School of Medicine
  • FUKUSHIMA MINEKO
    Department of Obstetrics and Gynecology, Akita University School of Medicine
  • MAKI MASAHIRO
    Department of Obstetrics and Gynecology, Akita University School of Medicine

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  • Endocrinological and Histological Aspec

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OTA, H., FUKUSHIMA, M. and MAKI, M. Endocrinological and Histological Aspects of the Process of Polycystic Ovary Formation in the Rat Treated with Testosterone Propionate. Tohoku J. exp. Med., 1983, 140 (2), 121-131 - To elucidate the process underlying polycystic ovary (PCO) syndrome, we tried to produce experimental PCO by sterilizing rats with androgen and investigated the formation of PCO endocrinologically and histologically. Wistar-Imamichi strain female rats were given an injection of testosterone propionate 1.25mg on 5 days of age. On 5, 10, 20, 40, 60, 80, 100, 130, 160, 200 days after the injection the ovaries were obtained. Ovarian wedge resection was also performed at 100 and 200 day-rats. Serum gonadotropins, prolactin and steroids were measured with RIA and compared with ovarian pathology. Serum prolactin was increased drastically 40 days after the injection and maintained at a constant level higher than control. Through wedge resection, the serum LH level returned to normal, but FSH slightly increased. Serum estradiol decreased more markedly than estrone did. The 40 day-ovaries showed polycystic features, lack of corpus luteum, hyperthecosis, luteinization of stroma, while no thickening of tunica albuginea. In conclusion, the rats treated with testosterone propionate had many endocrinological and histological aspects similar to those of human PCO syndrome.

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