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タイトル: Physiological requirements for 20-hydroxyecdysone-induced rectal sac distention in the pupa of the silkworm, Bombyx mori
著者: Suzuki, Takumi
Sakurai, Sho link image
Iwami, Masafumi link image link image
櫻井, 勝
岩見, 雅史
発行日: 2010年 6月
出版社(者): Elsevier
雑誌名: Journal of Insect Physiology
ISSN: 0022-1910
巻: 56
号: 6
開始ページ: 673
終了ページ: 677
キーワード: Ecdysteroid
Excretory system
Metamorphosis
Pupa
Rectal sac
抄録: Successful insect development is achieved via appropriate fluctuation of ecdysteroid levels. When an insect's ecdysteroid level is disrupted, physiological and developmental defects occur. In the pupa of the silkworm, Bombyx mori, the rectal sac is an essential organ that operates as a repository for degraded ecdysteroids, and it can be distended by administration of 20-hydroxyecdysone (20E). Our previous study showed that rectal sac distention appears 4 days after 20E administration. Hemolymph ecdysteroid levels, however, decrease to lower level during this period. Thus, the timing of the rectal sac distention does not match with that of ecdysteroid elevation. Here, we examine how 20E induces rectal sac distention. A ligature experiment and ecdysteroid quantification showed that continuous 20E stimulation induces rectal sac distention. Thorax tissue contributed to the continuous 20E stimulation needed to induce distention. Ecdysteroid released from the thorax tissue may be converted to 20E by ecdysone 20-hydroxylase to produce continuous 20E stimulation. Thus, the ecdysone metabolic pathway plays a critical role in rectal sac distention. © 2010 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.jinsphys.2010.02.006
URI: http://hdl.handle.net/2297/23874
関連URI: http://www.elsevier.com/locate/issn/00221910
資料種別: Journal Article
版表示: author
出現コレクション:1.査読済論文(理)

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