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Antagonistic actions of ecdysone and insulins determine final size in Drosophila

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  • Colombani, Julien
  • Laurence Bianchini
  • Sophie Layalle
  • Emilie Pondeville
  • Chantal Dauphin-Villemant
  • Christophe Antoniewski
  • Clément Carré
  • Stéphane Noselli
  • Pierre Léopold

All animals coordinate growth and maturation to reach their final size and shape. In insects, insulin family molecules control growth and metabolism, whereas pulses of the steroid 20-hydroxyecdysone (20E) initiate major developmental transitions. We show that 20E signaling also negatively controls animal growth rates by impeding general insulin signaling involving localization of the transcription factor dFOXO and transcription of the translation inhibitor 4E-BP. We also demonstrate that the larval fat body, equivalent to the vertebrate liver, is a key relay element for ecdysone-dependent growth inhibition. Hence, ecdysone counteracts the growth-promoting action of insulins, thus forming a humoral regulatory loop that determines organismal size.

OriginalsprogEngelsk
TidsskriftScience (New York, N.Y.)
Vol/bind310
Udgave nummer5748
Sider (fra-til)667-70
Antal sider4
ISSN0036-8075
DOI
StatusUdgivet - 28 okt. 2005
Eksternt udgivetJa

ID: 213553000