Drosophila's Insulin/PI3-Kinase Pathway Coordinates Cellular Metabolism with Nutritional Conditions

Studies in Drosophila have characterized insulin receptor/phosphoinositide 3-kinase (Inr/PI3K) signaling as a potent regulator of cell growth, but its function during development has remained uncertain. Here we show that inhibiting Inr/PI3K signaling phenocopies the cellular and organismal effects o...

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Veröffentlicht in:Developmental cell 2002-02, Vol.2 (2), p.239-249
Hauptverfasser: Britton, Jessica S., Lockwood, Wendy K., Li, Ling, Cohen, Stephen M., Edgar, Bruce A.
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container_title Developmental cell
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creator Britton, Jessica S.
Lockwood, Wendy K.
Li, Ling
Cohen, Stephen M.
Edgar, Bruce A.
description Studies in Drosophila have characterized insulin receptor/phosphoinositide 3-kinase (Inr/PI3K) signaling as a potent regulator of cell growth, but its function during development has remained uncertain. Here we show that inhibiting Inr/PI3K signaling phenocopies the cellular and organismal effects of starvation, whereas activating this pathway bypasses the nutritional requirement for cell growth, causing starvation sensitivity at the organismal level. Consistent with these findings, studies using a pleckstrin homology domain-green fluorescent protein (PH-GFP) fusion as an indicator for PI3K activity show that PI3K is regulated by the availability of dietary protein in vivo. Hence we surmise that an essential function of insulin/PI3K signaling in Drosophila is to coordinate cellular metabolism with nutritional conditions.
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subjects 3-kinase
Amino Acid Sequence
Animal Nutritional Physiological Phenomena
Animals
Animals, Genetically Modified
Blood Proteins - chemistry
Blood Proteins - genetics
Cell Division - drug effects
Dietary Proteins - metabolism
Dietary Proteins - pharmacology
Drosophila
Drosophila - cytology
Drosophila - drug effects
Drosophila - growth & development
Drosophila - metabolism
Fat Body - drug effects
Fat Body - enzymology
Fat Body - growth & development
Fat Body - metabolism
Feeding Behavior
Insulin - metabolism
Larva - cytology
Larva - drug effects
Larva - growth & development
Larva - metabolism
Molecular Sequence Data
Phenotype
Phosphatidylinositol 3-Kinases - antagonists & inhibitors
Phosphatidylinositol 3-Kinases - metabolism
Phosphoproteins - chemistry
Phosphoproteins - genetics
Protein Structure, Tertiary
Receptor, Insulin - metabolism
Signal Transduction - drug effects
Starvation - metabolism
Stomach - cytology
Stomach - drug effects
Stomach - growth & development
Stomach - metabolism
Survival Rate
Transgenes - genetics
title Drosophila's Insulin/PI3-Kinase Pathway Coordinates Cellular Metabolism with Nutritional Conditions
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