Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-600

Radimerski, T; Montagne, J; Rintelen, F; Stocker, H; van der Kaay, J; Downes, C P; Hafen, E; Thomas, G (2002). dS6K-regulated cell growth is dPKB/dPI(3)K-independent, but requires dPDK1. Nature Cell Biology, 4(3):251-255.

[img]
Preview
PDF
690kB

View at publisher

Abstract

Genetic studies in Drosophila melanogaster underscore the importance of the insulin-signalling pathway in controlling cell, organ and animal size. Effectors of this pathway include Chico (the insulin receptor substrate homologue), dPI(3)K, dPKB, dPTEN, and dS6K. Mutations in any of these components have a striking effect on cell size and number, with the exception of dS6K. Mutants in dS6K affect cell size but not cell number, seemingly consistent with arguments that dS6K is a distal effector in the signalling pathway, directly controlled by dTOR, a downstream effector of dPI(3)K and dPKB. Unexpectedly, recent studies showed that dS6K activity is unimpaired in chico-deficient larvae, suggesting that dS6K activation may be mediated through the dPI(3)K docking sites of the Drosophila insulin receptor. Here, we show genetically, pharmacologically and biochemically that dS6K resides on an insulin signalling pathway distinct from that of dPKB, and surprisingly also from that of dPI(3)K. More striking, despite dPKB-dPI(3)K-independence, dS6K activity is dependent on the Drosophila homologue of the phosphoinositide-dependent protein kinase 1, dPDK1, demonstrating that both dPDK1, as well as dTOR, mediated dS6K activation is phosphatidylinositide-3,4,5-trisphosphate (PIP3)-independent.

Citations

125 citations in Web of Science®
126 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

63 downloads since deposited on 11 Feb 2008
16 downloads since 12 months

Detailed statistics

Additional indexing

Item Type:Journal Article, refereed
Communities & Collections:07 Faculty of Science > Institute of Zoology (former)
DDC:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:1 March 2002
Deposited On:11 Feb 2008 12:16
Last Modified:27 Nov 2013 21:26
Publisher:Nature Publishing Group
ISSN:1465-7392
Publisher DOI:10.1038/ncb763
PubMed ID:11862217

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page