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タイトル: Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis
著者: SASAKI, Motoki
AMANO, Yoko
HAYAKAWA, Daisuke
TSUBOTA, Toshio
ISHIKAWA, Hajime
MOGOE, Toshihiro
OHSUMI, Seiji
TETSUKA, Masafumi
MIYAMOTO, Akio
FUKUI, Yutaka
BUDIPITOJO, Teguh
KITAMURA, Nobuo
佐々木, 基樹
手塚, 雅文
宮本, 明夫
北村, 延夫
キーワード: Antarctic minke whale
Balaenoptera bonaerensis
Morphology
Placenta
Steroidogenesis
発行日: 2013
出版者: 日本繁殖生物学会
誌名: Journal of Reproduction and Development
巻: 59
号: 2
開始ページ: 159-167
抄録: 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.
URI: http://ir.obihiro.ac.jp/dspace/handle/10322/3862
ISSN: 1348-4400
0916-8818
出現コレクション:00C01学術雑誌論文

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