Journal
JOURNAL OF INSECT PHYSIOLOGY
Volume 52, Issue 6, Pages 569-575Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jinsphys.2006.02.004
Keywords
diapause; MAPK; ecdysteroids; sorbitol; chilling
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The eggs of the silkworm Bombyx mori undergo a state of suspended overt development and diminished metabolism called 'diapause' to escape adverse environmental conditions. Termination of Bombyx embryonic diapause requires 2-3 months of low temperature (5 degrees C), but the molecular mechanisms underlying diapause termination are unknown. Diapause termination requires a decrease in the sorbitol concentration, which arrests embryonic development, and the secretion factors from yolk cells that promote embryonic development. In the present study, we report that 20-hydroxyecdysone promoted the development of denuded embryos and that ecdysteroid-phosphate phosphatase (EPPase), which is a key enzyme for active ecdysteroid production, was induced by incubation of diapausing eggs at 5 degrees C. In dechorionated egg cultures, extracellular signal-regulated kinase (ERK), which is activated by incubating diapausing eggs at 5 degrees C, regulated sorbitol-glycogen conversion, ecdysteroid secretion via gene transcription of key enzymes, sorbitol dehydrogenase-2, and EPPase, suggesting that ERK has a key role in diapause termination. (c) 2006 Elsevier Ltd. All rights reserved.
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