Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis
application/pdf 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 nonpregna...
Published in: | Journal of Reproduction and Development |
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Society for Reproduction and Development
2013
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Online Access: | https://obihiro.repo.nii.ac.jp/record/953/files/sasakim59.159-167.pdf |
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ftobihirouniv:oai:obihiro.repo.nii.ac.jp:00000953 2024-05-19T07:31:32+00:00 Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis Sasaki, Motoki 佐々木, 基樹 Amano, Yoko Hayakawa, Daisuke Tsubota, Toshio Ishikawa, Hajime Mogoe, Toshihiro Ohsumi, Seiji Tetsuka, Masafumi 手塚, 雅文 Miyamoto, Akio 宮本, 明夫 Fukui, Yutaka Budipitojo, Teguh Kitamura, Nobuo 2013 application/pdf https://obihiro.repo.nii.ac.jp/record/953/files/sasakim59.159-167.pdf eng eng Society for Reproduction and Development doi:10.1262/jrd.2012-132 Journal of Reproduction and Development 2 59 159 167 AA10936678 09168818 https://obihiro.repo.nii.ac.jp/record/953/files/sasakim59.159-167.pdf Reproduction and Development Antarctic minke whale Balaenoptera bonaerensis Morphology Placenta Steroidogenesis VoR 2013 ftobihirouniv https://doi.org/10.1262/jrd.2012-132 2024-05-01T23:31:13Z application/pdf 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. journal article Other/Unknown Material Antarc* Antarctic Antarctic Minke whale Balaenoptera bonaerensis minke whale Obihiro University: Obihiro Archives of Knowledge (OAK) Journal of Reproduction and Development 59 2 159 167 |
institution |
Open Polar |
collection |
Obihiro University: Obihiro Archives of Knowledge (OAK) |
op_collection_id |
ftobihirouniv |
language |
English |
topic |
Antarctic minke whale Balaenoptera bonaerensis Morphology Placenta Steroidogenesis |
spellingShingle |
Antarctic minke whale Balaenoptera bonaerensis Morphology Placenta Steroidogenesis Sasaki, Motoki 佐々木, 基樹 Amano, Yoko Hayakawa, Daisuke Tsubota, Toshio Ishikawa, Hajime Mogoe, Toshihiro Ohsumi, Seiji Tetsuka, Masafumi 手塚, 雅文 Miyamoto, Akio 宮本, 明夫 Fukui, Yutaka Budipitojo, Teguh Kitamura, Nobuo Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis |
topic_facet |
Antarctic minke whale Balaenoptera bonaerensis Morphology Placenta Steroidogenesis |
description |
application/pdf 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. journal article |
format |
Other/Unknown Material |
author |
Sasaki, Motoki 佐々木, 基樹 Amano, Yoko Hayakawa, Daisuke Tsubota, Toshio Ishikawa, Hajime Mogoe, Toshihiro Ohsumi, Seiji Tetsuka, Masafumi 手塚, 雅文 Miyamoto, Akio 宮本, 明夫 Fukui, Yutaka Budipitojo, Teguh Kitamura, Nobuo |
author_facet |
Sasaki, Motoki 佐々木, 基樹 Amano, Yoko Hayakawa, Daisuke Tsubota, Toshio Ishikawa, Hajime Mogoe, Toshihiro Ohsumi, Seiji Tetsuka, Masafumi 手塚, 雅文 Miyamoto, Akio 宮本, 明夫 Fukui, Yutaka Budipitojo, Teguh Kitamura, Nobuo |
author_sort |
Sasaki, Motoki |
title |
Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis |
title_short |
Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis |
title_full |
Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis |
title_fullStr |
Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis |
title_full_unstemmed |
Structure and Steroidogenesis of the Placenta in the Antarctic Minke Whale (Balaenoptera bonaerensis |
title_sort |
structure and steroidogenesis of the placenta in the antarctic minke whale (balaenoptera bonaerensis |
publisher |
Society for Reproduction and Development |
publishDate |
2013 |
url |
https://obihiro.repo.nii.ac.jp/record/953/files/sasakim59.159-167.pdf |
genre |
Antarc* Antarctic Antarctic Minke whale Balaenoptera bonaerensis minke whale |
genre_facet |
Antarc* Antarctic Antarctic Minke whale Balaenoptera bonaerensis minke whale |
op_relation |
doi:10.1262/jrd.2012-132 Journal of Reproduction and Development 2 59 159 167 AA10936678 09168818 https://obihiro.repo.nii.ac.jp/record/953/files/sasakim59.159-167.pdf |
op_rights |
Reproduction and Development |
op_doi |
https://doi.org/10.1262/jrd.2012-132 |
container_title |
Journal of Reproduction and Development |
container_volume |
59 |
container_issue |
2 |
container_start_page |
159 |
op_container_end_page |
167 |
_version_ |
1799469387622645760 |