Dynamic Switch of Negative Feedback Regulation in Drosophila Akt–TOR Signaling

DSpace/Manakin Repository

Dynamic Switch of Negative Feedback Regulation in Drosophila Akt–TOR Signaling

Citable link to this page

. . . . . .

Title: Dynamic Switch of Negative Feedback Regulation in Drosophila Akt–TOR Signaling
Author: Kockel, Lutz; Melnick, Michael; Brückner, Katja; Hebrok, Matthias; Kerr, Kimberly Sayer; Perrimon, Norbert

Note: Order does not necessarily reflect citation order of authors.

Citation: Kockel, Lutz, Kimberly S. Kerr, Michael Melnick, Katja Brückner, Matthias Hebrok, and Norbert Perrimon. 2010. Dynamic switch of negative feedback regulation in Drosophila Akt-TOR Signaling. PLoS Genetics 6(6): e1000990.
Full Text & Related Files:
Abstract: Akt represents a nodal point between the Insulin receptor and TOR signaling, and its activation by phosphorylation controls cell proliferation, cell size, and metabolism. The activity of Akt must be carefully balanced, as increased Akt signaling is frequently associated with cancer and as insufficient Akt signaling is linked to metabolic disease and diabetes mellitus. Using a genome-wide RNAi screen in Drosophila cells in culture, and in vivo analyses in the third instar wing imaginal disc, we studied the regulatory circuitries that define dAkt activation. We provide evidence that negative feedback regulation of dAkt occurs during normal Drosophila development in vivo. Whereas in cell culture dAkt is regulated by S6 Kinase (S6K)–dependent negative feedback, this feedback inhibition only plays a minor role in vivo. In contrast, dAkt activation under wild-type conditions is defined by feedback inhibition that depends on TOR Complex 1 (TORC1), but is S6K–independent. This feedback inhibition is switched from TORC1 to S6K only in the context of enhanced TORC1 activity, as triggered by mutations in tsc2. These results illustrate how the Akt–TOR pathway dynamically adapts the routing of negative feedback in response to the activity load of its signaling circuit in vivo.
Published Version: doi:10.1371/journal.pgen.1000990
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2887466/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4774093

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters