Hormonal Events Surrounding Spontaneous Onset of Puberty in Female Rats

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概要

• 論文の詳細を見る

• In an effort to define more completely the hormonal events surrounding onset of puberty in female rats, concentration of sex steroids and gonadotropins in serum, ovaries and pituitaries were quantified. Simultaneously the sites and intensity of synthesis of the hormones were observed immunohistochemically. It was found that an increase in tissue concentration of follicle stimulating hormone (FSH), luteinizing hormone (LH), progeterone (Po) and estradiol (E_2) preceded vaginal opening (VO). However, the serum levels of these hormones were not significantly increased until the day of VO except for serum E_2 levels which were fairly high during the early prepubertal period. Coincident with an increase in pituitary gonadotropin levels was an increase in the staining intensity for pituitary gonadotropes. However, the increase in ovarian steroid levels was not always coincident with the staining intensity for steroid-producing cells. The site or localization of steroid synthesis in the ovary was the thecal layer, but not the granulosa, of various growing follicles. The present results clearly indicated that the preovulatory changes in gonadotropins and sex steroids in blood and the tissues are similar to those noted in cycling adult rats, suggesting that prepubertal gonadotropin surge is induced via a common mechanism. They also indicated that ovarian steroids, especially estrogens, are synthesized mainly in the thecal layer of growing follicles.

• 東海大学の論文

著者

• SAKABE KOU

  Department of Public Health and Molecular Toxicology, Kitasato University School of Pharmaceutical S

• OGAWA Haruko

  Department of Chemistry, Faculty of Science, Ochanomizu University

• Ogawa Haruko

  Department Of Advanced Biosciences Graduate School Of Humanities And Sciences

• Ogawa Haruko

  Department Of Anatomy School Of Medicine Tokai University

• Sakabe Kou

  Department Of Anatomy School Of Medicine

• Sakabe Kou

  Department Of Human Structure And Function Tokai University School Of Medicine

• Sakabe Kou

  Department Of Anatomy And Cellular Biology Tokai University School Of Medicine

• SEIKI Kanji

  Department of Anatomy, School of Medicine, Tokai University

• FUJII-HANAMOTO Hideko

  Department of Anatomy, School of Medicine, Tokai University

• KAWASHIMA Issei

  Department of Anatomy, School of Medicine, Tokai University

• Seiki Kanji

  Department Of Anatomy School Of Medicine

• Seiki Kanji

  Department Of Analomy School Of Medicine Tokai University

• Kawashima Issei

  Department Of Anatomy School Of Medicine

• Sakabe K

  Department Of Human Structure And Function Tokai University School Of Medicine

• Fujii-hanamoto Hideko

  Department Of Anatomy School Of Medicine

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