このアイテムのアクセス数: 97

このアイテムのファイル:
ファイル 記述 サイズフォーマット 
srep07855.pdf6.6 MBAdobe PDF見る/開く
タイトル: Prenatal regression of the trophotaenial placenta in a viviparous fish, Xenotoca eiseni.
著者: Iida, Atsuo  kyouindb  KAKEN_id
Nishimaki, Toshiyuki
Sehara-Fujisawa, Atsuko
著者名の別形: 飯田, 敦夫
西槇, 俊之
瀬原, 淳子
キーワード: Biological metamorphosis
Ichthyology
発行日: 19-Jan-2015
出版者: Nature Publishing Group
誌名: Scientific reports
巻: 5
論文番号: 7855
抄録: The trophotaenial placenta is a branching, ribbon-like structure that extends from the perianal region of the embryo in viviparous teleost fishes belonging to the family Goodeidae. It is a hindgut-derived pseudoplacenta, which contributes to absorbing maternal nutrients during the prenatal stage. The trophotaeniae are known to reduce at birth; however, no previous study has evaluated the removal mechanisms. We report here the analysis of the trophotaeniae using the goodeid fish species Xenotoca eiseni. The X. eiseni trophotaenia consists of an epidermal cell layer, mesenchyme, vasculature, and circulating erythrocytes. The trophotaeniae had preliminary regressed when the embryo was born. Immunohistochemistry indicated that caspase3-activated cells with fragmented nuclei are present in the regressed processes of the fry immediately after birth, but not in the vasculature and blood cells. This finding suggests that the trophotaenia is rapidly resorbed by apoptosis in the last phase of the pregnancy and that its circulatory pathway is maintained. Such prenatal regression of pseudoplacentae has not been reported in other viviparous vertebrates. On the other hand, similar apoptotic remodeling in the gut has been reported in amphibians, which is regulated by thyroid hormone. Thus, apoptotic regression of the trophotaeniae might occur in a manner similar to amphibian metamorphosis.
記述: 魚類が「胎生」になるために獲得した仕組みの一端を解明 京都大学プレスリリース. 2015-01-20.
著作権等: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission fromthe license holder in order to reproduce thematerial. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/193211
DOI(出版社版): 10.1038/srep07855
PubMed ID: 25598151
関連リンク: http://www.kyoto-u.ac.jp/ja/research/research_results/2014/150119_1.html
出現コレクション:学術雑誌掲載論文等

アイテムの詳細レコードを表示する

Export to RefWorks


出力フォーマット 


このリポジトリに保管されているアイテムはすべて著作権により保護されています。