Preovulatory Changes in Morphology of Rabbit Ovarian Follicles
スポンサーリンク
概要
- 論文の詳細を見る
To examine timed changes in the morphology of theca interna and granulosa cells of rabbit preovulatory follicles, mature female rabbits were injected with 100 IU per kg of human chorionic gonadotropin (hCG) and follicles larger than1mn in diameter were excised for light and electron microscopic studies before and 3, 6, 9 and 12hr after hCG injection. Spindle-shaped theca interna cells had been transformed into rounded cells with pronounced hypertrophy within9hr after hCG injection, and degenerative changes in cellular appearance with reduction in cellular density became apparent 12hr after hCG administration. Electron micrographs of thecal cells showed that the maximum proliferation of large mitochondria and the full development of smooth endoplasmic reticulum (sER) had occurred by6hr after hCG injection, while by 12hr after hCG administration abundant lipid droplets had accumulated and sER had decreased. These morphological changes in the theca interna cells indicate an activated endocrine function in the earlier stage followed by diminution in steroidogenesis in the later stage of the preovulatory interval. Although no appreciable changes was noted in granulosa cell histology in the first 6 hr after hCG injection, luteinizing changes proceeded9hr or more after hCG administration, as evidenced by the enlargement of cytoplasmic volume. A series of cytoplasmic modifications of granulosa cells leading to the formation of the fine structures characteristic of steroid-producing cells developed gradually in the earlier stage and rapidly in the final stage prior to ovulation, indicating differentiation of granulosa cells into lutein cells. It is concluded that the major cellular site of steroid biosynthesis in ovulating rabbit follicles may shift from degenerating thecal cells to luteinizing granulosa cells in the course of the preovulatory process.
- 社団法人 日本内分泌学会の論文
著者
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SUZUKI AKIRA
Department of Hospital Pharmacy
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YOSHIDA Yoshinobu
Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo
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Mori Takahide
Department Of Gynecology And Gbstetrics Faculty Of Medicine Kyoto University
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Takenaka Akira
Department Of Physics Kanazawa University : Department Of Physics Ritsumeikan University
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FUJITA Yasuhiko
Department of Electrical and Electronic Engineering,Tokyo Metropolitan College of Technology
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Nishimura Toshio
Department Of Pathology Kansai Medical University
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Fujita Yasuhiko
Department Of Electrical And Electronic Engineering Tokyo Metropolitan College Of Technology
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Suzuki Akira
Department Of Anesthesiology And Intensive Care Hamamatsu University School Of Medicine
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Nishimura Toshio
Department Of Biosciences School Of Science And Engineering Teikyo University
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MORI Takahide
Department of Gynaecology and Obstetrics, Kyoto University Graduate School of Medicine
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MORI TAKAHIDE
Department of Obstetrics and Gynecology, Shiga University of Medical Science
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