Rectal sac distention is induced by 20-hydroxyecdysone in the pupa of Bombyx mori

フォーマット:

論文

責任表示:

Suzuki, Takumi ; Sakurai, Sho ; Iwami, Masafumi

言語:

英語

出版情報:

Elsevier, 2009-03-01

著者名:

• Suzuki, Takumi
• Sakurai, Sho
• Iwami, Masafumi

掲載情報:

Journal of Insect Physiology

ISSN:

0022-1910      

巻:

55

通号:

3

開始ページ:

250

終了ページ:

254

バージョン:

author

概要:

Holometabolous insects do not excrete but store metabolic wastes during the pupal period. The waste is called meconium and is purged after adult emergence. Although the contents of meconium are well-studied, the developmental and physiological regulation of meconium accumulation is poorly understood. In Bombyx mori, meconium is accumulated in the rectal sac; thereby, the rectal sac distends at the late pupal stage. Here, we show that rectal sac distention … occurs between 4 and 5 days after pupation. The distention is halted by brain-removal just after larval-pupal ecdysis but not by brain-removal 1 day after pupation. In the pupae, brain-removal just after ecdysis kept the hemolymph ecdysteroid titer low during early and mid-pupal stages. An injection of 20-hydroxyecdysone (20E) evoked the distention that was halted by brain-removal in a dose-dependent manner. Therefore, brain-removal caused the lack of ecdysteroid, and rectal sac distention did not appear in the brain-removed pupae because of the lack of ecdysteroid. We conclude that rectal sac distention is one of the developmental events regulated by 20E during the pupal period in B. mori. © 2008 Elsevier Ltd. All rights reserved. 続きを見る

URL:

http://hdl.handle.net/2297/14386