Areolae of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis)

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  • SASAKI Motoki
    Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan United Graduate School of Veterinary Medicine, Gifu University, Gifu 501-1193, Japan
  • AMANO Yoko
    Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
  • HAYAKAWA Daisuke
    Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan United Graduate School of Veterinary Medicine, Gifu University, Gifu 501-1193, Japan Present: Wanpark Kochi Animal Land, Kochi 780-8010, Japan
  • TSUBOTA Toshio
    Laboratory of Wildlife Biology and Medicine, Department of Environmental Veterinary Science, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan
  • ISHIKAWA Hajime
    Institute of Cetacean Research, Tokyo 104-0055, Japan Present: Whale Laboratory, Shimonoseki Academy of Marine Science, Yamaguchi 750-0036, Japan
  • MOGOE Toshihiro
    Institute of Cetacean Research, Tokyo 104-0055, Japan
  • OHSUMI Seiji
    Institute of Cetacean Research, Tokyo 104-0055, Japan
  • TETSUKA Masafumi
    Department of Life Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
  • MIYAMOTO Akio
    Department of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
  • FUKUI Yutaka
    Department of Life Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
  • BUDIPITOJO Teguh
    Faculty of Veterinary Medicine, Gadjah Mada University, Yogyakarta 55281, Indonesia
  • KITAMURA Nobuo
    Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan United Graduate School of Veterinary Medicine, Gifu University, Gifu 501-1193, Japan

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タイトル別名
  • Areolae of the Placenta in the Antarctic Minke Whale (<i>Balaenoptera bonaerensis</i>)

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In this study, we examined the existence and structure of areolae and the steroidogenesis of areolar trophoblast cells in the Antarctic minke whale placenta morphologically and immunohistochemically. Placentas were collected from the 15th, 16th and 18th Japanese Whale Research Program under Special Permit in the Antarctic (JARPA) and 1st JARPA II organized by the Institute of Cetacean Research in Tokyo, Japan. The opening and cavity of fetal areolae formed by taller columnar trophoblast cells (areolar trophoblast cells) with long microvilli and a bright cytoplasm, as compared with the trophoblast cells of the chorionic villi interdigitating with the endometrial crypts, were recognized in observations of serial sections. The opening of the areolar cavity was hidden by chorionic villi with areolar trophoblast cells. Furthermore, a closed pouch-like structure lined by tall columnar cells similar to areolar trophoblast cells within the stroma of chorionic villi was noticed and continued to the areolar cavity, with the opening seen on serial sections. In a surface investigation of the chorion and endometrium by SEM, maternal (endometrial) areolae irregularly surrounded by endometrial folds were obvious. Moreover, we distinguished areolar trophoblast cells with long microvilli attached with many blebs from trophoblast cells. In our immunohistochemical observations, a steroidogenic enzyme, cytochrome P450 side chain cleavage enzyme (P450scc), was detected with strong immunoreactivity in trophoblast cells. However, areolar trophoblast cells showed weak or no immunoreactivity for P450scc.

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