Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis)
スポンサーリンク
概要
- 論文の詳細を見る
There are few reports describing the structure and function of the whale placenta with the advance of pregnancy. In this study, therefore, the placenta and nonpregnant uterus of the Antarctic minke whale were observed morphologically and immunohistochemically. Placentas and nonpregnant uteri were collected from the 15th, 16th and 18th Japanese Whale Research Programme with Special Permit in the Antarctic (JARPA) and 1st JARPA II organized by the Institute of Cetacean Research in Tokyo, Japan. In the macro- and microscopic observations, the placenta of the Antarctic minke whale was a diffuse and epitheliochorial placenta. The chorion was interdigitated to the endometrium by primary, secondary and tertiary villi, which contained no specialized trophoblast cells such as binucleate cells, and the interdigitation became complicated with the progress of gestation. Furthermore, fetal and maternal blood vessels indented deeply into the trophoblast cells and endometrial epithelium respectively with fetal growth. The minke whale placenta showed a fold-like shape as opposed to a finger-like shape. In both nonpregnant and pregnant uteri, many uterine glands were distributed. The uterine glands in the superficial layer of the pregnant endometrium had a wide lumen and large epithelial cells as compared with those in the deep layer. On the other hand, in the nonpregnant endometrium, the uterine glands had a narrower lumen and smaller epithelial cells than in the pregnant endometrium. In immunohistochemical detection, immunoreactivity for P450scc was detected in most trophoblast cells, but not in nonpregnant uteri, suggesting that trophoblast epithelial cells synthesized and secreted the sex steroid hormones and/or their precursors to maintain the pregnancy in the Antarctic minke whale.
- 日本繁殖生物学会の論文
著者
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Ohsumi Seiji
Institute Of Cetacean Research
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Tsubota Toshio
Laboratory Of Ecology Department Of Environmental Veterinary Sciences Graduate School Of Veterinary
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KITAMURA Nobuo
Laboratory of Anatomy, Department of Basic Veterinary Sciences, Obihiro University of Agriculture an
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Hayakawa Daisuke
Laboratory of Anatomy, Department of Basic Veterinary Science, Obihiro University of Agriculture and
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ISHIKAWA Hajime
Institute of Cetacean Research
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Miyamoto Akio
Department Of Agricultural And Life Science Obihiro University Of Agriculture And Veterinary Medicin
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Tetsuka Masafumi
Department Of Agricultural And Life Science Obihiro University Of Agriculture & Veterinary Medic
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Fukui Yutaka
Department Of Animal Science Obihiro University Of Agriculture And Veterinary Medicine
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Sasaki Motoki
Laboratory Of Anatomy Obihiro University Of Agriculture And Veterinary Medicine
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HAYAKAWA Daisuke
Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
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FUKUI Yutaka
Department of Life Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
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AMANO Yoko
Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
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MOGOE Toshihiro
Institute of Cetacean Research, Tokyo 104-0055, Japan
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BUDIPITOJO Teguh
Faculty of Veterinary Medicine, Gadjah Mada University, Yogyakarta 55281, Indonesia
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KITAMURA Nobuo
Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
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Ishikawa Hajime
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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TSUBOTA Toshio
Laboratory of Wildlife Biology and Medicine, Department of Environmental Veterinary Science, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan
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OHSUMI Seiji
Institute of Cetacean Research, Tokyo 104-0055, Japan
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TETSUKA Masafumi
Department of Life Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan
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